阅读说明：本技术 光源装置、投影装置以及光源控制方法 (Light source device, projection device, and light source control method ) 是由 增田弘树 小川昌宏 马峰治 成川哲郎 于 2020-03-18 设计创作，主要内容包括：光源装置、投影装置以及光源控制方法。所述装置包括：第一发光元件,射出第一波段光；荧光轮,具有荧光发光区域,荧光发光区域将由第一波段光激发的荧光作为第二波段光射出；第二发光元件,射出在比第二波段光靠长波长侧分布的第三波段光；合成机构,合成第一波段光至第三波段光；色轮,包括：将由合成机构合成的第三波段光和第二波段光的长波长侧的一部分的光选择作为第四波段光的区域、和透射可见光的区域；以及控制部,控制第一发光元件、第二发光元件、荧光轮以及色轮,并控制为使第一波段光和第四波段光分时地射出,控制部对荧光轮和色轮进行同步控制,并根据输出模式将色轮相对于荧光轮的同步位置移位而进行控制。(A light source device, a projection device and a light source control method. The device comprises: a first light emitting element that emits light of a first wavelength band; a luminescent wheel having a luminescent light emitting region that emits luminescent light excited by light of the first wavelength band as light of a second wavelength band; a second light emitting element that emits a third wavelength band light distributed on a longer wavelength side than the second wavelength band light; a synthesizing mechanism for synthesizing the first to third wavelength band lights; a color wheel, comprising: selecting a region in which the light of the third wavelength band light and a part of the light of the second wavelength band light synthesized by the synthesizing means on the long wavelength side as the fourth wavelength band light and a region in which visible light is transmitted; and a control unit that controls the first light emitting element, the second light emitting element, the fluorescent wheel, and the color wheel, and controls the first wavelength band light and the fourth wavelength band light to be emitted in a time-division manner, wherein the control unit controls the fluorescent wheel and the color wheel in synchronization with each other, and controls the color wheel by shifting a synchronization position with respect to the fluorescent wheel in accordance with an output pattern.)

1. A light source device, comprising:

a first light emitting element that emits light of a first wavelength band;

a luminescent wheel having a luminescent region that emits luminescent light excited by the light of the first wavelength band as light of a second wavelength band;

a second light emitting element that emits a third wavelength band light distributed on a longer wavelength side than the second wavelength band light;

a combining unit that combines the first wavelength band light to the third wavelength band light;

a color wheel, comprising: selecting, as a region that transmits visible light, a region on a long wavelength side of the third wavelength band light and a portion of the second wavelength band light synthesized by the synthesizing means; and

a control unit for controlling the first light emitting element, the second light emitting element, the fluorescent wheel, and the color wheel so as to emit the first wavelength band light and the fourth wavelength band light in a time-division manner,

the control unit synchronously controls the fluorescent wheel and the color wheel, and controls the color wheel to shift a synchronous position with respect to the fluorescent wheel according to an output pattern.

2. The light source device according to claim 1,

the region transmitting the visible light is a second transmission region,

the region selected as the fourth wavelength band light and made transmissive is a third transmissive region that also transmits the first wavelength band light.

3. The light source device according to claim 2,

the control section controls, in real time:

during a first output period, irradiating the second wave band light to the second transmission area of the color wheel;

irradiating the first wavelength band light to the second transmission region or the third transmission region of the color wheel during a second output period;

during a third output period, irradiating the second wavelength band light and the third wavelength band light to the third transmission region of the color wheel; and

during a fourth output period, the second wavelength band light and the third wavelength band light are irradiated to the second transmission region or the third transmission region of the color wheel.

4. The light source device according to claim 3,

the length of the second output period is equal to or longer than the length of the fourth output period.

5. The light source device according to claim 3,

the length of the second output period is substantially the same as the length of the fourth output period.

6. The light source device according to claim 2,

the combining means includes a first dichroic mirror that reflects light other than the first wavelength side of the second wavelength band light and transmits the third wavelength band light, or transmits light other than the first wavelength side of the second wavelength band light and reflects the third wavelength band light, thereby guiding light other than the first wavelength side of the second wavelength band light and the third wavelength band light to the color wheel side.

7. The light source device according to claim 6,

the third transmission region of the color wheel transmits light on a second long wavelength side of wavelength sides shorter than the first long wavelength side of the third and second wavelength band lights, among the light other than the first long wavelength side of the third and second wavelength band lights synthesized by the first dichroic mirror.

8. The light source device according to claim 1,

the control unit changes the relative phase of the color wheel with respect to the fluorescent wheel to a target shift angle in a stepwise manner for each of a plurality of division shift angles, and switches the output mode to a plurality of output modes in which different light source lights are emitted.

9. The light source device according to claim 8,

the control unit confirms completion of the shift for each of the division shift angles and changes the shift to the target shift angle when shifting the phase of the color wheel.

10. The light source device according to any one of claims 1 to 9,

the first light emitting element is a blue laser diode,

the second light emitting element is a red light emitting diode,

the first wavelength band light is blue wavelength band light,

the second band of wavelengths is green band of wavelengths,

the third wavelength band light is red wavelength band light.

11. The light source device according to claim 1,

the combined color of the second wavelength band light and the third wavelength band light is yellow wavelength band light.

12. A projection device, comprising:

the light source device of claim 1;

a display element that generates image light; and

a projection optical system that projects the image light emitted from the display element to a screen,

the control unit controls the light source device and the display element.

13. A light source control method of a light source device is provided, wherein,

the light source device includes:

a first light emitting element that emits light of a first wavelength band;

a luminescent wheel having a luminescent region that emits luminescent light excited by the light of the first wavelength band as light of a second wavelength band;

a second light emitting element that emits a third wavelength band light distributed on a longer wavelength side than the second wavelength band light;

a combining unit that combines the first wavelength band light to the third wavelength band light;

a color wheel, comprising: selecting, as a region that transmits visible light, a region on a long wavelength side of the third wavelength band light and a portion of the second wavelength band light synthesized by the synthesizing means; and

a control part for controlling the operation of the display device,

in the light source control method, the control unit controls the first light emitting element, the second light emitting element, the fluorescent wheel, and the color wheel, controls the fluorescent wheel and the color wheel so that the first wavelength band light and the fourth wavelength band light are emitted in a time-division manner, synchronously controls the fluorescent wheel and the color wheel, and shifts a synchronous position of the color wheel with respect to the fluorescent wheel according to an output pattern.

14. The light source control method according to claim 13,

the control unit changes the relative phase of the color wheel with respect to the fluorescent wheel to a target shift angle in a stepwise manner for each of a plurality of division shift angles, and switches the output mode to a plurality of output modes in which different light source lights are emitted.

Technical Field

The invention relates to a light source device, a projection device provided with the light source device and a light source control method.

Background

Jp 2017 a-3643 a discloses a light source device including a light source, a fluorescent wheel, and a color wheel, wherein the fluorescent wheel and the color wheel are controlled in synchronization to emit green, red, and blue light. The fluorescent wheel has a plurality of light source segments for receiving light emitted from the light source and emitting light of different wavelength bands. The light source segment includes a green phosphor layer, a yellow phosphor layer, a red phosphor layer, and a transmission region for transmitting light in a blue wavelength band. The color wheel has a blue-green transmission region through which blue and green light can be transmitted and a white transmission region through which red, yellow, green, and blue light can be transmitted, and light of different wavelength bands is irradiated from the fluorescent wheel.

However, in a structure in which a phosphor layer is provided on a fluorescent wheel as in japanese patent application laid-open No. 2017-3643, it is assumed that the extension range of the emission time of the fluorescence is physically limited, and sufficient luminance required for image formation cannot be secured depending on the color. Therefore, it may be difficult to ensure the color balance of the entire projected image.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a light source device, a projection device, and a light source control method with improved color balance.

The present invention provides a light source device, including: a first light emitting element that emits light of a first wavelength band; a luminescent wheel having a luminescent region that emits luminescent light excited by the light of the first wavelength band as light of a second wavelength band; a second light emitting element that emits a third wavelength band light distributed on a longer wavelength side than the second wavelength band light; a combining unit that combines the first wavelength band light to the third wavelength band light; a color wheel, comprising: selecting, as a region that transmits visible light, a region on a long wavelength side of the third wavelength band light and a portion of the second wavelength band light synthesized by the synthesizing means; and a control unit that controls the first light emitting element, the second light emitting element, the fluorescent wheel, and the color wheel, and controls the first wavelength band light and the fourth wavelength band light to be emitted in a time-division manner, wherein the control unit controls the fluorescent wheel and the color wheel in synchronization with each other, and controls the color wheel by shifting a synchronization position with respect to the fluorescent wheel in accordance with an output pattern.

The invention provides a projection device, which comprises: the light source device described above; a display element that generates image light; and a projection optical system that projects the image light emitted from the display element onto a screen, wherein the control unit controls the light source device and the display element.

The invention provides a light source control method of a light source device, wherein the light source device comprises the following steps: a first light emitting element that emits light of a first wavelength band; a luminescent wheel having a luminescent region that emits luminescent light excited by the light of the first wavelength band as light of a second wavelength band; a second light emitting element that emits a third wavelength band light distributed on a longer wavelength side than the second wavelength band light; a combining unit that combines the first wavelength band light to the third wavelength band light; a color wheel, comprising: selecting, as a region that transmits visible light, a region on a long wavelength side of the third wavelength band light and a portion of the second wavelength band light synthesized by the synthesizing means; and a control unit that controls the first light-emitting element, the second light-emitting element, the fluorescent wheel, and the color wheel, controls the fluorescent wheel and the color wheel so as to emit the first wavelength band light and the fourth wavelength band light in a time-division manner, controls the fluorescent wheel and the color wheel in synchronization with each other, and controls the color wheel by shifting a synchronization position of the color wheel with respect to the fluorescent wheel in accordance with an output pattern.

Drawings

Fig. 1 is a diagram showing a functional circuit block of a projection apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic plan view showing an internal structure of a projection apparatus according to an embodiment of the present invention.

FIG. 3A is a schematic top view of a fluorescent wheel according to an embodiment of the present invention.

Fig. 3B is a schematic top view of a color wheel according to an embodiment of the present invention.

Fig. 4 is a graph showing the transmission characteristics of the first dichroic mirror and the second dichroic mirror and the transmission characteristics of the blue-red transmission region of the color wheel according to the embodiment of the present invention.

Fig. 5 is a timing chart of the operation in the color-oriented mode (second output mode) of the light source device according to the embodiment of the present invention.

Fig. 6 is a timing chart of the operation in the luminance emphasis mode (first output mode) of the light source device according to the embodiment of the present invention.

Fig. 7 is a timing chart of an operation in the luminance emphasis mode (first output mode) of the light source device according to the modified example of the embodiment of the present invention.

Fig. 8 is a timing chart of an operation in the color-oriented mode (second output mode) of the light source device according to the modified example of the embodiment of the present invention.

Fig. 9 is a schematic diagram illustrating an operation of changing the phase difference between the color wheel and the fluorescent wheel of the light source device according to the embodiment of the present invention.

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described. Fig. 1 is a functional circuit block diagram of a projection apparatus 10. The projector control section is constituted by a CPU including the image conversion section 23 and the control section 38, a front end unit including the input-output interface 22, and a formatting unit including the display encoder 24 and the display drive section 26. The image signals of various specifications input from the input/output connector unit 21 are collectively converted into image signals of a predetermined format suitable for display in the image conversion unit 23 via the input/output interface 22 and the system bus SB, and then output to the display encoder 24.

The display encoder 24 expands and stores the input image signal in the video RAM25, and then generates a video signal from the stored content of the video RAM25 and outputs the video signal to the display driver 26.

The display driving unit 26 drives the display element 51, which is a spatial light modulator (SOM), at an appropriate frame rate in accordance with the image signal output from the display encoder 24. The projection apparatus 10 irradiates the display element 51 with a light beam emitted from the light source apparatus 60 via a light guide optical system, forms an optical image by the reflected light of the display element 51, and projects the display image on a screen, not shown, via a projection optical system described later. The movable lens group 235 of the projection optical system can be driven by the lens motor 45 for zoom adjustment and focus adjustment.

The image compression/decompression section 31 performs a recording process of compressing the luminance signal and the color difference signal of the image signal by ADCT and huffman coding, and sequentially writing the compressed data into a memory card 32, which is a removable recording medium. The image compression/decompression section 31 reads image data recorded in the memory card 32 in the playback mode, decompresses each image data constituting a series of moving images in units of 1 frame, and outputs the decompressed image data to the display encoder 24 via the image conversion section 23. Thus, the image compression/decompression section 31 can display moving images and the like based on the image data stored in the memory card 32.

The control unit 38 is responsible for controlling the operation of each circuit in the projection apparatus 10, and is configured by a ROM that fixedly stores operation programs such as a CPU and various settings, and a RAM used as a work memory.

The key/indicator unit 37 is constituted by a main key and an indicator provided in the housing. The operation signal of the key/pointer section 37 is directly transmitted to the control section 38. Further, the key operation signal from the remote controller is received by the Ir receiving unit 35, demodulated into a code signal by the Ir processing unit 36, and output to the control unit 38.

The control unit 38 is connected to the audio processing unit 47 via the system bus SB. The audio processing unit 47 includes an audio source circuit such as a PCM audio source, and simulates audio data in the projection mode and the reproduction mode, and drives the speaker 48 to perform sound amplification and sound reproduction.

The control section 38 controls the light source control circuit 41. The light source control circuit 41 controls the operation of each of the excitation light irradiation devices of the light source device 60 so that light of a predetermined wavelength band required for image generation is emitted from the light source device 60. The light source control circuit 41 controls the timing of synchronization of the fluorescent wheel 101 and the color wheel 201A (see fig. 2 and the like) in accordance with an instruction from the control unit 38.

The control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection by a plurality of temperature sensors provided in the light source device 60 and the like, and controls the rotation speed of the cooling fan based on the result of the temperature detection. Further, the control unit 38 performs the following control: the cooling fan drive control circuit 43 continues the rotation of the cooling fan even after the power supply to the main body of the projection apparatus 10 is turned off by a timer or the like, or turns off the power supply to the main body of the projection apparatus 10 based on the result of the temperature detection by the temperature sensor. As will be described later in detail, the projector control unit including the control unit 38 controls the blue laser diode 71 (first light emitting element), the red light emitting diode 121 (second light emitting element), the fluorescent wheel 101, and the color wheel 201A to time-divisionally control the blue wavelength band light, the green wavelength band light (second wavelength band light), or a fifth wavelength band light (a part of the second wavelength band light) to be described later, and the fourth wavelength band light [ a part of the long wavelength sides of the red wavelength band light (third wavelength band light) and the green wavelength band light (second wavelength band light) ].

Fig. 2 is a schematic plan view showing an internal structure of the projector apparatus 10. The projection apparatus 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power circuit module, a light source control module, and the like. The projection apparatus 10 includes the light source device 60, the light source optical system 170, and the projection optical system 220 on the left side of the control circuit board 241.

The light source device 60 includes an excitation light irradiation device 70 serving as a light source for blue wavelength band light (first wavelength band light) and an excitation light source, a green light source device 80 serving as a light source for green wavelength band light (second wavelength band light), a red light source device 120 serving as a light source for red wavelength band light (third wavelength band light), and a color wheel device 200. The green light source device 80 is composed of an excitation light irradiation device 70 and a luminescent wheel device 100.

A light guide optical system 150 for guiding light of each color wavelength band is disposed in the light source device 60. The light guide optical system 150 guides the light emitted from the excitation light irradiation device 70, the green light source device 80, and the red light source device 120 to the light source optical system 170.

The excitation light irradiation device 70 is disposed near the rear panel 13 of the projection device 10. The excitation light irradiation device 70 includes a light source group including a plurality of blue laser diodes 71, and a condenser lens 78. The blue laser diode 71 (first light emitting element) is a semiconductor light emitting element, and is disposed so that the optical axis is parallel to the rear panel 13.

The light source group is formed by arranging a plurality of blue laser diodes 71 in a matrix. On the optical axis of each blue laser diode 71, a collimator lens 73 that converts the light emitted from the blue laser diode 71 into parallel light is disposed so as to improve the directivity. The light in the blue wavelength band emitted from the collimator lens 73 is reflected by a stepped mirror group 75 and guided to a condenser lens 78. The condenser lens 78 reduces the size of the light flux emitted from the blue laser diode 71 in one direction and emits the light flux to the first dichroic mirror 151.

The fluorescent wheel device 100 is disposed in the vicinity of the front panel 12 on the optical path of the excitation light emitted from the excitation light irradiation device 70. The fluorescent wheel device 100 includes a fluorescent wheel 101, a motor 110, a condenser lens group 111, and a condenser lens 115. The luminescent wheel 101 is disposed so as to be orthogonal to the optical axis of the light emitted from the excitation light irradiation device 70. The motor 110 drives the fluorescent wheel 101 to rotate.

Here, the structure of the fluorescence wheel 101 will be explained. Fig. 3A is a schematic top view of a fluorescent wheel 101. The fluorescent wheel 101 is formed in a disc shape and has a mounting hole 112 at the center thereof. Since the mounting hole 112 is fixed to the shaft of the motor 110, the fluorescent wheel 101 can rotate around the shaft when the motor 110 is driven.

The luminescent wheel 101 is provided with a luminescent light emitting region 310 and a transmission region (first transmission region) 320 juxtaposed in the circumferential direction. The fluorescent light emitting region 310 is formed within an angular range of approximately 270 degrees, and the transmissive region 320 is formed within the remaining angular range of approximately 90 degrees. The substrate of the fluorescent wheel 101 may be formed of a metal substrate such as copper or aluminum. The surface of the substrate on the side of the excitation light irradiation device 70 is mirror-finished by silver vapor deposition or the like. A fluorescent light-emitting region 310 is formed on the mirror-finished surface. A green phosphor layer is formed in the fluorescent light emitting region 310. The fluorescent light emitting region 310 receives the blue wavelength band light from the excitation light irradiation device 70 as excitation light, and emits green wavelength band fluorescence in all directions. The fluorescence is incident on the condenser lens group 111 shown in fig. 2.

The transmissive region 320 is disposed between both ends of the luminescent light emitting region 310 with the boundaries B1 and B2 interposed therebetween. The transmissive region 320 can be formed by fitting a transparent base material having translucency into a cut-out portion of the base material formed in the fluorescent wheel 101. The transparent substrate is made of a transparent material such as glass or resin. Further, a diffusion layer may be provided on the surface of the transparent substrate on the side irradiated with light of the blue wavelength band or on the opposite side. The diffusion layer can be provided by forming fine irregularities on the surface of the transparent substrate by sandblasting or the like, for example. The blue wavelength band light from the excitation light irradiation device 70 incident on the transmission region 320 is transmitted or diffused through the transmission region 320 and incident on the condenser lens 115 shown in fig. 2.

Returning to fig. 2, the condenser lens group 111 condenses the light flux of the blue wavelength band light emitted from the excitation light irradiation device 70 on the luminescent wheel 101, and condenses the luminescent light emitted from the luminescent wheel 101 toward the back panel 13. The condenser lens 115 condenses the light flux emitted from the fluorescent wheel 101 toward the front panel 12. The excitation light irradiator 70 and the luminescent wheel device 100 are cooled by the radiators 81 and 130 and the cooling fan 261 arranged in the projector 10.

The red light source device 120 includes a red light emitting diode 121 (second light emitting element) as a semiconductor light emitting element disposed such that the blue laser diode 71 is parallel to the optical axis of the emitted light, and a condensing lens group 125 that condenses the red wavelength band light emitted from the red light emitting diode 121. The red light source device 120 is disposed such that the optical axis of the red wavelength band light emitted from the red light emitting diode 121 intersects the optical axis of the blue wavelength band light emitted from the excitation light irradiation device 70 and transmitted through the first dichroic mirror 151.

The light guide optical system 150 includes a first dichroic mirror 151 (combining means), a second dichroic mirror 152 (combining means), condenser lenses 155 to 157 for condensing light beams, and reflection mirrors 153 and 154 for converting the optical axes of the light beams into the same optical axis. Hereinafter, each member will be explained.

The first dichroic mirror 151 is disposed between the condenser lens 78 and the condenser lens group 111. The first dichroic mirror 151 transmits the blue wavelength band light to the condenser lens group 111 side, and reflects the green wavelength band light toward the condenser lens 155 to convert the optical axis thereof by 90 degrees.

The first dichroic mirror 151 is a combining mechanism that combines light in the green wavelength band (light in the second wavelength band) and light in the red wavelength band (light in the third wavelength band) on the same optical axis, reflects light in the green wavelength band, and transmits light in the red wavelength band. The light in the green wavelength band reflected by the first dichroic mirror 151 is condensed by the condenser lens 155 and enters the second dichroic mirror 152. Specifically, the first dichroic mirror 151 (combining means) reflects light other than the first wavelength side of the green band light (second band light) (light included in a reflection band W1b described later in fig. 4), transmits red band light (third band light), and guides light other than the first wavelength side of the green band light (second band light) and the red band light (third band light) to the color wheel 201A side via the second dichroic mirror 152. Further, the mirrors 151 to 154 and the condenser lenses 155 to 157 may be appropriately arranged so that the first dichroic mirror 151 transmits light other than the first wavelength side of the green band light (second band light) and reflects the red band light (third band light), and light other than the first wavelength side of the green band light (second band light) and the red band light (third band light) are guided to the color wheel 201A side.

The red wavelength band light transmitted through the first dichroic mirror 151 is condensed by the condenser lens 155, and is incident on the second dichroic mirror 152 disposed on the left side panel 15 side of the condenser lens 155. The second dichroic mirror 152 reflects light in the red wavelength band and light in the green wavelength band and transmits light in the blue wavelength band. Therefore, the second dichroic mirror 152 reflects the red wavelength band light and the green wavelength band light condensed by the condenser lens 155 toward the condenser lens 173, and guides the red wavelength band light and the green wavelength band light. Specifically, the second dichroic mirror 152 reflects light other than the first long wavelength side of the green band light (second band light) synthesized by the first dichroic mirror 151 and red band light (third band light), transmits blue band light (first band light), and guides the blue band light (first band light) to the red band light (third band light) to the color wheel 201A. Alternatively, the light guide optical system 150 and the light source optical system 170 may be configured appropriately so as to transmit light other than the first wavelength side of the green band light (second band light) synthesized by the first dichroic mirror 151 and the red band light (third band light), and to reflect the blue band light (first band light), and to guide the blue band light (first band light) to the red band light (third band light) to the color wheel 201A.

On the other hand, when the irradiation region S (see fig. 3A) of the blue wavelength band light in the fluorescent wheel 101 is the transmission region 320, the blue wavelength band light emitted from the blue laser diode 71 passes through the transmission region 320, is condensed by the condenser lens 115, and is guided to the reflecting mirror 153. The reflecting mirror 153 is disposed on the optical axis of the blue wavelength band light transmitted or diffused through the fluorescent wheel 101. The mirror 153 reflects the light in the blue wavelength band and guides the optical axis thereof to the condenser lens 156 disposed on the left side panel 15 side. The mirror 154 reflects the light in the blue wavelength band condensed by the condenser lens 156 and guides the light to the condenser lens 157 side. The light in the blue wavelength band reflected by the reflecting mirror 154 is condensed by the condenser lens 157, passes through the second dichroic mirror 152, and is guided toward the condenser lens 173.

The light source optical system 170 includes a condenser lens 173, a light tunnel 175, a condenser lens 178, an optical axis conversion mirror 181, a condenser lens 183, an irradiation mirror 185, and a focus lens 195. The focus lens 195 also is a part of the projection optical system 220, since it emits the image light emitted from the display element 51 disposed on the rear panel 13 side of the focus lens 195 toward the projection optical system 220.

The condenser lens 173 is disposed on the second dichroic mirror 152 side of the light tunnel 175 as the light guide member. The condenser lens 173 condenses the green wavelength band light, the blue wavelength band light, and the red wavelength band light guided from the second dichroic mirror 152. The light of each color wavelength band condensed by the condenser lens 173 is applied to the color wheel 201A of the color wheel device 200.

The color wheel device 200 includes a color wheel 201A and a motor 210 for rotationally driving the color wheel 201A. The color wheel device 200 is disposed between the condenser lens 173 and the light tunnel 175 such that the optical axis of the light beam emitted from the condenser lens 173 is perpendicular to the irradiation surface on the color wheel 201A.

Fig. 3B is a schematic top view of the color wheel 201A. The color wheel 201A is formed in a disc shape and has a mounting hole 113 at the center thereof. Since the mounting hole 113 is fixed to the shaft of the motor 210, the color wheel 201A can be rotated around the shaft by driving the motor 210.

The color wheel 201A is provided with a full-color transmission region 410A (second transmission region) and a blue-red transmission region 420A (third transmission region) side by side in the circumferential direction. The full-color transmissive region 410A can transmit light in a blue wavelength band, light in a green wavelength band, and light in a red wavelength band. The blue-red transmission region 420A can transmit the blue-band light and the red-band light and transmit a part of the green-band light on the long wavelength side, and can shield a part of the green-band light on the short wavelength side by absorption or the like.

In this way, the color wheel 201A has a plurality of regions, and one of the plurality of regions is a region (blue-red transmission region 420A) in which a part of light on the long wavelength side of the red band light (third band light) and the green band light (second band light) synthesized by the first dichroic mirror 151 (synthesizing means) is selected as the fourth band light.

Specifically, the color wheel 201A transmits light on the second long wavelength side (light included in the overlap band W3 in fig. 4) on the wavelength side shorter than the first long wavelength side of the red wavelength band light and the green wavelength band light (light included in the overlap band W3 in fig. 4) among the light on the first long wavelength side of the red wavelength band light (third wavelength band light) and the green wavelength band light (second wavelength band light). The region of the color wheel 201A selected as the fourth wavelength band light is a blue-red transmission region 420A (third transmission region), and light transmitted through the color wheel 201A and selected as a part of the fourth wavelength band light on the long wavelength side of the second wavelength band light is positioned on the wavelength side longer than the peak wavelength of the second wavelength band light and on the wavelength side shorter than the peak wavelength of the third wavelength band light.

In the color wheel 201A of the present embodiment, the full-color transmissive region 410A is formed in an angular range of substantially 204 degrees, and the blue-red transmissive region 420A is formed in an angular range of substantially 156 degrees. The blue-red transmissive region 420A is disposed adjacent to the full-color transmissive region 410A via the boundaries B3 and B4.

The light transmitted through the full-color transmissive region 410A or the blue-red transmissive region 420A is guided toward the light channel 175 in fig. 2. The light beam incident on the light tunnel 175 becomes a light beam of uniform intensity distribution in the light tunnel 175.

A condenser lens 178 is disposed on the optical axis of the light tunnel 175 on the rear panel 13 side. A light axis converter 181 is disposed on the side of the condenser lens 178 closer to the back panel 13. The light flux emitted from the exit of the light tunnel 175 is condensed by the condenser lens 178 and then reflected by the optical axis converter 181 toward the left side panel 15.

The light flux reflected by the optical axis switching mirror 181 is condensed by the condenser lens 183, and then is irradiated to the display element 51 at a predetermined angle through the focus lens 195 by the irradiation mirror 185. A heat sink 190 is provided on the rear panel 13 side of the display element 51 as the DMD. The display element 51 is cooled by the heat sink 190.

The light source light irradiated to the image forming surface of the display element 51 by the light source optical system 170 is reflected at the image forming surface of the display element 51, and is projected as projection light onto the screen via the projection optical system 220. Here, the projection optical system 220 is composed of a focus lens 195, a movable lens group 235, and a fixed lens group 225. The movable lens group 235 is formed to be movable by a lens motor 45. In addition, the movable lens group 235 and the fixed lens group 225 are built in the fixed barrel. Therefore, the fixed barrel including the movable lens group 235 is a variable focus lens, and is formed to be capable of zoom adjustment and focus adjustment.

With the projection apparatus 10 configured as described above, when the fluorescence wheel 101 and the color wheel 201A are rotated in synchronization and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at an arbitrary timing, light of each wavelength band of green, blue, and red enters the condenser lens 173 via the light guide optical system 150 and enters the display element 51 via the light source optical system 170. Therefore, the display element 51 can project a color image on the screen by displaying the light of each color in a time-division manner based on the data.

Next, with reference to fig. 4, the transmission characteristic A1A of the first dichroic mirror 151 and the transmission characteristic A2a of the blue-red transmission region 420A of the color wheel 201A will be described. The horizontal axis of fig. 4 indicates the wavelength, and the left vertical axis indicates the transmittance of each of the transmission characteristics A1a and A2 a. Fig. 4 shows the wavelength distributions of blue-band light L1 emitted from the blue laser diode 71, green-band light L2 emitted from the luminescent light emitting region 310, and red-band light L3 emitted from the red light emitting diode 121. The vertical axis on the right side of fig. 4 indicates the light intensities of the blue-band light L1, the green-band light L2, and the red-band light L3.

The peak wavelengths P1, P2, and P3 of the blue-band light L1, the green-band light L2, and the red-band light L3 are arranged in the order of the blue-band light L1, the green-band light L2, and the red-band light L3 from the short wavelength side. In the present embodiment, the blue-band light L1 has a wavelength component of approximately 430nm to 440nm, and the green-band light L2 has a wavelength component of approximately 470nm to 700 nm. The red wavelength band light L3 distributed on the longer wavelength side than the green wavelength band light L2 has a wavelength component of approximately 590nm to 650 nm.

As shown in the transmission characteristic A1a, the first dichroic mirror 151 has a transmission band W1a through which light of a predetermined wavelength on the long wavelength side is transmitted and a transmission band (not shown in fig. 4) through which the blue band light L1 is transmitted. In addition, the first dichroic mirror 151 reflects light of the reflection band W1b on the shorter wavelength side than the response wavelength (cut-on wavelength) a11 of the transmission band W1 a. Therefore, the first dichroic mirror 151 can transmit most of the red wavelength band light L3 emitted from the red light emitting diode 121 and guide it to the color wheel 201A side. The first dichroic mirror 151 can transmit a part of the green wavelength band light L2 emitted from the luminescent light emitting region 310 on the long wavelength side (light in the transmission band W1A), and reflect the other part of the green wavelength band light L2 on the short wavelength side (light in the reflection band W1 b) to guide the light to the color wheel 201A side. A part of the green wavelength band light L2 transmitted through the first dichroic mirror 151 becomes reject light.

As shown by the transmission characteristic A2a of the two-dot chain line, the blue-red transmission region 420A has a transmission band W2a on the long wavelength side, which transmits light of a predetermined wavelength band including blue and red. The blue-red transmission region 420A can block light by absorbing light on a wavelength side longer than the cut-off wavelength a21 of the contrast transmission band W2a and shorter than the response wavelength a 22. Therefore, the blue-red transmission region 420A can transmit most of the red wavelength band light L3 emitted from the red light emitting diode 121 and guide it to the light tunnel 175.

In the present embodiment, the overlapped band W3 in which the long-wavelength side component of the reflection band W1b and the short-wavelength side component of the transmission band W2a overlap each other is included. The overlap band W3 is a band of light forming the 2 nd long wavelength side shorter than the 1 st long wavelength side. Since the green band light L2 of the reflection band W1b on the wavelength side shorter than the response wavelength a11 of the first dichroic mirror 151 is guided to the blue-red transmission region 420A of the color wheel 201A, the blue-red transmission region 420A transmits the light of the overlapping band W3 of the green band light L2 emitted from the fluorescent light-emitting region 310, and can be guided to the light tunnel 175. The overlap band W3 is located on the longer wavelength side than the peak wavelength P2 of the green band light L2 and on the shorter wavelength side than the peak wavelength P3 of the red band light L3. By combining the light of the overlap band W3 extracted from the green wavelength band light L2 and the red wavelength band light L3 emitted from the red light emitting diode 121, bright red wavelength band light can be emitted as the light source light of the light source device 60.

Further, since the green band light L2 is reflected by the first dichroic mirror 151, the reflection band W1b, which is a partial wavelength component thereof, is incident on the full-color transmissive region 410A.

The blue-band light L1 transmits the full-color transmission region 410A or the blue-red transmission region 420A of the color wheel 201A and is guided toward the light tunnel 175.

(examples)

Fig. 5 is a timing chart of the operation of the light source device 60 in the color-oriented mode (second output mode). As shown in fig. 5, in the first output period T50A, the red band light L3 is turned off, and the green band light L2 emitted from the fluorescent wheel 101 is irradiated to the full-color transmission region 410A provided in the color wheel 201A. In the second output period T50b, the red band light L3 is turned off, and the blue band light L1 emitted from the fluorescent wheel 101 is irradiated to the full-color transmission region 410A provided in the color wheel 201A. In the third output period T50c and the fourth output period T50d, the red band light L3 and the green band light L2 are irradiated to the blue-red transmission region 420A provided in the color wheel 201A.

Thus, as the combined light 900, the green wavelength band light 90a1 can be emitted in the first output period T50a, the blue wavelength band light 90b1 can be emitted in the second output period T50b, and the red wavelength band light 90c1 and 90d1 can be emitted in the third output period T50c and the fourth output period T50 d.

The control unit 38 can shift the phase of the color wheel 201A with respect to the fluorescent wheel 101 by a light source control method shown in fig. 9, which will be described later. Fig. 6 is a timing chart of the operation in the luminance emphasis mode (first output mode) of the light source device 60. Fig. 6 is a schematic diagram showing an operation when the phase difference of the color wheel 201A with respect to the fluorescent wheel 101 of the light source device 60 is changed. The change of the phase difference of the color wheel 201A is controlled by the control unit 38. In the brightness-oriented mode, the color wheel 201A is moved from the state of fig. 5, and as shown in fig. 6, the blue-red transmissive region 420A is disposed in the second output period T50b and the third output period T50c, and the full-color transmissive region 410A is disposed in the first output period T50A and the fourth output period T50 d.

In the first output period T50A, the red band light L3 is turned off, and the green band light L2 emitted from the fluorescent wheel 101 is irradiated to the full-color transmission region 410A provided in the color wheel 201A. In the second output period T50b, the red band light L3 is turned off, and the blue band light L1 emitted from the fluorescent wheel 101 is irradiated to the blue-red transmission region 420A provided on the color wheel 201A.

In the third output period T50c, the red band light L3 and the green band light L2 emitted from the luminescent wheel 101 are irradiated to the blue-red transmission region 420A. In the fourth output period T50d, the full-color transmissive region 410A is irradiated with the red band light L3 and the green band light L2 emitted from the luminescent wheel 101.

Thus, as the combined light 900, the green wavelength band light 90a2 can be emitted in the first output period T50a, the blue wavelength band light 90b2 can be emitted in the second output period T50b, the red wavelength band light 90c2 can be emitted in the third output period T50c, and the red wavelength band light 90d2 can be emitted in the fourth output period T50 d.

In this way, the control section 38 can control in time division the first output period T50A during which the second wavelength band light is irradiated to the second transmission region (full-color transmission region 410A) of the color wheel 201A, the second output period T50b during which the first wavelength band light is irradiated to the second transmission region (full-color transmission region 410A) or the third transmission region (blue-red transmission region 420A) of the color wheel 201A, the third output period T50c during which the second wavelength band light and the third wavelength band light are irradiated to the third transmission region (blue-red transmission region 420A) of the color wheel 201A, and the fourth output period T50d during which the second wavelength band light and the third wavelength band light are irradiated to the second transmission region (full-color transmission region 410A) or the third transmission region (blue-red transmission region 420A) of the color wheel 201A.

In this case, the length of the second output period T50b is preferably equal to or greater than the length of the fourth output period T50 d. In particular, the length of the second output period T50b and the length of the fourth output period T50d are preferably substantially the same time. This is because, when the length of the second output period T50b and the length of the fourth output period T50d are substantially the same time, the blue-red transmission region 420A coincides with the switching of the synthesized light 900 even if the synchronization position of the color wheel 201A is shifted to any of the positions of fig. 5 and 6.

When the length of the second output period T50b during which blue light is emitted is longer than the length of the fourth output period T50d during which red light or yellow light is emitted, the color wheel 201A has both the period of the full-color transmission region 410A and the period of the blue-red transmission region 420A during the period during which blue light is emitted. However, even when the light passes through any region of the color wheel 201A, the color of the emitted light does not cause a problem due to the timing of emitting blue light.

(modification example)

Next, the operations of the light source device 60 in the luminance emphasis mode (first output mode) and the color emphasis mode (second output mode) will be described with reference to fig. 7 and 8. The light source device 60 can switch the output mode by changing the phase difference of the color wheel 201B with respect to the fluorescent wheel 101. The color wheel 201B of the present modification includes, instead of the full-color transmissive region 410A and the blue-red transmissive region 420A of the color wheel 201A shown in fig. 3B, a full-color transmissive region 410B, a red transmissive region 420B, and a blue-green transmissive region 430B arranged in parallel in the circumferential direction. The full-color transmissive region 410B is formed at two positions between the red transmissive region 420B and the cyan transmissive region 430B. The full-color transmissive region 410B can transmit visible light including blue-band light L1, green-band light L2, and red-band light L3. The red transmission region 420B has a response wavelength substantially equal to the response wavelength a11 of the blue-red transmission region 420A shown in fig. 4, and can transmit the red wavelength band light L3. The cyan transmission region 430B can transmit most of light on the short wavelength side of the blue-band light L1 and the green-band light L2.

Fig. 7 is a timing chart of the operation in the first output mode of the light source device 60. The first output mode is a mode in which the color reproducibility of green is improved and yellow is emitted to place importance on the overall brightness. The light source device 60 forms one image for each frame 500(510), and projects images in time-division continuously over a plurality of frames 500. The light source device 60 time-divides the frame 500 in the order of the first output period T50a, the second output period T50b, the third output period T50c, and the fourth output period T50d, and emits light of a color assigned in advance to each output period.

The red light emitting diode 121(600) turns off the red band light L3 in the first output period T50a and the second output period T50b, and emits the red band light L3 in the third output period T50c and the fourth output period T50 d. The blue laser diode 71(400) emits the blue wavelength band light L1(40) from the first output period T50a to the fourth output period T50 d.

In the first output period T50a, since the blue wavelength band light L1 output from the blue laser diode 71 is irradiated to the luminescent light emitting region 310 of the luminescent wheel 101(700), the green wavelength band light L2 is emitted from the luminescent light emitting region 310. The green wavelength band light L2 emitted from the luminescent light emitting region 310 is guided by the light guide optical system 150 (see fig. 2) and is applied to the blue-green transmission region 430B of the color wheel 201B (800). The cyan transmission region 430A transmits a component on the short wavelength side (light included in the transmission band W4a shown in fig. 4) of the green wavelength band light L2, and therefore the light source device 60 guides the green wavelength band light 90A3 to the light tunnel 175 as the combined light 900 of the first output period T50A. In the first output period T50a, green band light 90a3 with high color purity, which is shielded on the long wavelength side, is emitted.

In the second output period T50b, the blue band light L1 emitted from the blue laser diode 71 is irradiated to the transmission region 320 of the fluorescent wheel 101, and thus the irradiated blue band light L1 is transmitted by the transmission region 320. The blue wavelength band light L1 emitted from the transmission region 320 is guided by the light guide optical system 150 and is irradiated to the full-color transmission region 410B of the color wheel 201B. The full-color transmissive region 410B transmits most of the blue-band light L1, and therefore the light source device 60 guides the blue-band light 90B3 to the light tunnel 175 as the combined light 900 of the second output period T50B.

In the third output period T50c, the red wavelength band light L3 emitted from the red light emitting diode 121 is guided by the light guide optical system 150, irradiated to the blue-red transmission region 420B of the color wheel 201B, and transmitted toward the light tunnel 175. In the third output period T50c, since the blue-band light L1 emitted from the blue laser diode 71 is irradiated to the luminescent light emitting region 310 of the luminescent wheel 101, the green-band light L2 is emitted from the luminescent light emitting region 310. The green wavelength band light L2 emitted from the fluorescent light emitting region 310 is guided by the light guide optical system 150 and is irradiated to the blue-red transmission region 420B of the color wheel 201B. The blue-red transmission region 420B transmits light of the overlapping frequency band W3 shown in fig. 4. Therefore, the light source device 60 guides the red band light 90c3 (fourth band light) obtained by combining the light of the red band light L3 and a part of the green band light L2 corresponding to the overlap band W3 to the optical channel 175 as the combined light 900 of the third output period T50 c.

In the fourth output period T50d, the red wavelength band light L3 emitted from the red light emitting diode 121 is guided by the light guide optical system 150, irradiated to the full-color transmission region 410B of the color wheel 201B, and transmitted toward the light tunnel 175. In the fourth output period T50d, since the blue-band light L1 emitted from the blue laser diode 71 is irradiated to the luminescent light emitting region 310 of the luminescent wheel 101, the green-band light L2 is emitted from the luminescent light emitting region 310. The green wavelength band light L2 emitted from the fluorescent light emitting region 310 is guided by the light guide optical system 150 and is irradiated to the full-color transmission region 410B of the color wheel 201B. The green band light L2 has a part on the longer wavelength side of the response wavelength a11 as reject light by the first dichroic mirror 151, but light on the shorter wavelength side of the green band light L2 is almost transmitted through the full-color transmission region 410B. Therefore, the light source device 60 guides the yellow band light 90d3, which is a combination of the red band light L3 and the green band light L2 corresponding to the reflection band W1b, to the light tunnel 175 as the combined light 900 of the fourth output period T50 d.

When the fourth output period T50d elapses, the first output period T51a of the next frame 510 starts. In the first output period T51a, the light source device 60 controls the fluorescent wheel 101 and the color wheel 201B to emit the green band light 91a3 as the synthesized light 900, similarly to the first output period T50a described above. The subsequent operations are repeated as in the frame 500.

Further, as the luminescent light emitting region 310 of the luminescent wheel 101 shown in fig. 3A, a yellow luminescent light emitting region that is excited by excitation light and emits light in a yellow wavelength band may be formed. Accordingly, in the third output period T50c shown in fig. 7, the component on the wavelength side longer than the response wavelength a11 included in the combined light 900 can be increased, and bright red wavelength band light can be emitted. In this case, instead of the cyan transmission region 430B of the color wheel 201B, a green transmission region that transmits light in the green wavelength band may be disposed.

Fig. 8 is a timing chart of the operation of the light source device 60 in the color-oriented mode (second output mode). The third output mode is a mode in which the emission period of the red wavelength band light is extended instead of the emission of the yellow wavelength band light, and importance is placed on the color reproducibility of the entire light source device 60. In the color-oriented mode, the operation of the red light-emitting diode 121 is the same as in the luminance-oriented mode of fig. 7, but the phase of the color wheel 201A is shifted relative to the fluorescent wheel 101. The emission timing of the blue laser diode 71 and the luminescent wheel 101 is the same as the first output period T50a, the second output period T50b, and the fourth output period T50d in the luminance emphasis mode of fig. 7, but the output of the blue laser diode 71 in the third output period T50c is off.

In the first output period T50a, the green band light L2 emitted from the luminescent light emitting region 310 is guided by the light guide optical system 150 and is irradiated to the full-color transmission region 410B of the color wheel 201B. The component on the wavelength side shorter than the response wavelength a11 shown in fig. 4 of the guided green-band light L2 transmits the full-color transmissive region 410B. Therefore, as the combined light 900 in the first output period T50a, the light source device 60 guides the green band light 90a4 in a frequency band wider than the first output period T50a of fig. 7 to the light tunnel 175.

In the second output period T50b, the blue band light L1 emitted from the blue laser diode 71 is irradiated to the transmission region 320 of the fluorescent wheel 101, and thus the irradiated blue band light L1 is transmitted by the transmission region 320. The blue wavelength band light L1 emitted from the transmission region 320 is guided by the light guide optical system 150 and is irradiated to the blue-green transmission region 430B of the color wheel 201B. The blue-green transmission region 430B transmits most of the blue wavelength band light L1, and therefore the light source device 60 guides the blue wavelength band light 90B4 to the light tunnel 175 as the combined light 900 of the second output period T50B.

In the third output period T50c, the red wavelength band light L3 emitted from the red light emitting diode 121 is guided by the light guide optical system 150, irradiated to the red transmission region 420B of the color wheel 201B, and guided to the light tunnel 175. In the third output period T50c, the light intensity (light amount) of the blue band light L1 emitted from the blue laser diode 71 is set to zero. Therefore, the light source device 60 guides the red wavelength band light 90c4 to the light tunnel 175 as the combined light 900 of the third output period T50 c.

In the fourth output period T50d, the light source device 60 guides the red band light 90d4 (fourth band light) obtained by combining the red band light L3 and the part of the green band light L2 corresponding to the overlap band W3 to the optical channel 175 as the combined light 900 by the same operation as the third output period T50c in the first output mode of fig. 7.

When the fourth output period T50d elapses, the first output period T51a of the next frame 510 starts. In the first output period T51a, the light source device 60 controls the fluorescent wheel 101 and the color wheel 201B to emit the green band light 91a3 as the synthesized light 900, similarly to the first output period T50a of the second output pattern described above. The subsequent operations are repeated as in the frame 500.

In fig. 7, the case where any one of the green band light, the blue band light, the red band light, and the yellow band light is emitted all the time in each of the first output period T50a, the second output period T50b, the third output period T50c, and the fourth output period T50d is illustrated, but the light amounts of the green band light, the blue band light, the red band light, and the yellow band light emitted to each of the output periods T50a, T50b, T50c, and T50d may be adjusted by appropriately setting the periods in which the red light emitting diode 121 and the blue laser diode 71 are turned off or dimmed in each of the output periods T50a, T50b, T50c, and T50 d.

Here, a description will be given of a light source control method when changing the relative phase between the fluorescent wheel 101 and the color wheel 201B when switching between the first output mode (luminance-oriented mode) in fig. 6 or fig. 7 and the second output mode (color-oriented mode) in fig. 5 or fig. 8.

Fig. 9 is a schematic diagram showing an operation when the phase difference between the color wheels 201A and 201B with respect to the fluorescent wheel 101 of the light source device 60 is changed. The change of the phase difference between the color wheels 201A and 201B is controlled by the control unit 38.

In fig. 9, as shown in fig. 7, at the timing T2 at which the first output period T50a and the second output period T50B are switched, a phase difference of 0 ° is set in a state where the phase of the boundary B1 (see also fig. 3A) of the fluorescent wheel 101 coincides with the phase of the boundary changing from the cyan transmission region 430B to the full-color transmission region 410B of the color wheel 201B. In fig. 9, as shown in fig. 8, at a timing T2, a phase difference of 90 ° is set to a state where the phase of the boundary B1 (see also fig. 3A) of the fluorescent wheel 101 and the phase of the boundary changing from the full-color transmission region 410B to the cyan transmission region 430B of the color wheel 201B match.

In this drawing, a case of switching from the first output mode to the second output mode is assumed, and therefore the target moving angle of the color wheel 201B is 90 °. Further, a plurality of divided movement angles into which the target movement angle is divided in stages are set to 10 °. The control unit 38 changes the relative phase of the color wheel 201B with respect to the fluorescent wheel 101 in steps to 90 ° of the target movement angle for each of the plurality of divided movement angles of 10 °. This allows switching between a plurality of output modes (first output mode and second output mode) for emitting different light source lights. When shifting the phase of the color wheel 201B, the control unit 38 checks the completion of the shift for each 10 ° as the divided shift angle, and changes the phase to 90 ° as the target shift angle in stages.

The movement period T81 of the color wheel 201B by the divided movement angle amount may be set to a period within one frame 500 or over a plurality of frames 500. The standby period T82 before the color wheel 201B is moved again after the movement of the division movement angle of the color wheel 201B is completed may be set to be a period within one frame 500 or over a plurality of frames 500. The number of frames in each of the travel period T81 and the standby period T82 may be constant until the target travel angle is reached, or may be variable such as gradually increasing or decreasing. In this way, the moving speed and the moving acceleration from the start to the end of the phase change can be reduced. Further, since the phase difference of the color wheel 201B is checked a plurality of times for each division movement angle, the following ability can be improved.

By performing the control as described above, the speed of change in the phase of the color wheels 201A and 201B can be reduced, and overshoot and undershoot after reaching the target movement angle can be reduced. Therefore, when the phase is changed, it is possible to prevent color mixing of light of a color different from the timing of the color to be originally projected onto the screen (for example, mixing blue having a low visibility with green having a high visibility, or the like), and to reduce flickering of an image projected onto the screen. Further, since the change in the phase velocity is small, it is possible to reduce the driving sound generated from the motor 210 or suppress the increase in the driving current accompanying the phase change of the motor 210.

The light source device 60, the projection device 10, and the light source control method in the present embodiment have been described above. For the sake of explanation, the positions of the cutoff wavelength a31 and the response wavelengths a11 and a22 shown in fig. 4 exemplify wavelengths at which the transmittances of the transmission characteristics A1a and A2a are 50%, but the transmittance characteristics A1a and A2a can be appropriately set, and for example, the cutoff wavelength a21 and the response wavelengths a11 and a22 are wavelengths at which the transmittances are 95%.

In the above embodiment, the blue laser diode 71 (first light emitting element) is used for the blue wavelength band light (first wavelength band light), but the present invention is not limited to this configuration. For example, instead of the blue laser diode 71, an ultraviolet laser diode that emits laser light in an ultraviolet wavelength region may be used as an excitation light source that excites the fluorescence emitting region of the fluorescence wheel 101. In this case, a first transmission region that transmits light in the blue wavelength band (light in the first wavelength band) is not required on the fluorescence wheel. Instead, a semiconductor light emitting element such as a blue LED that emits light in the blue wavelength band (light in the first wavelength band) needs to be separately provided. For example, a blue LED may be disposed at a position facing the color wheels 201A and 201B with reference to the second dichroic mirror 152. In this configuration, the characteristics of the second dichroic mirror 152 may be the same as those of the above-described embodiment.

In the present embodiment, the configuration in which the color wheels 201A and 201B are moved in stages for each of the division movement angles when the first output mode and the second output mode are switched has been described, but the transmission regions 410A, 420A, and 410B to 430B provided in the color wheels 201A and 201B may have other configurations.

As described above, the light source device 60 and the projection device 10 described in each embodiment include: a first light emitting element that emits light of a first wavelength band; a luminescent wheel 101 having a luminescent light emitting region that emits luminescent light excited by light of the first wavelength band as light of the second wavelength band; a second light emitting element that emits a third wavelength band light distributed on a longer wavelength side than the second wavelength band light; a combining unit that combines the first to third wavelength bands of light; a color wheel having a plurality of regions, one of which is a region for selecting light on the long wavelength side of the third wavelength band light and the second wavelength band light synthesized by the synthesizing means as fourth wavelength band light, and the other of which is a region for selecting fifth wavelength band light which is a portion on the short wavelength side of the second wavelength band light guided by the synthesizing means; and a control unit 38 for controlling the first wavelength band light, the fourth wavelength band light, and the fifth wavelength band light to be emitted in a time-sharing manner. This makes it possible to increase the amount of light when the third wavelength band light is emitted, or to remove a part of the components on the long wavelength side when the second wavelength band light is emitted, thereby improving the color purity. Therefore, the light source device 60 and the light source control method of the projection apparatus 10, which improve the color balance as a whole, can be realized.

In addition, the fluorescent wheel 101 has a first transmission region that transmits the light of the first wavelength band. The plurality of regions of the color wheel 201A include: a plurality of second transmission regions that transmit light of a first wavelength band to the light of the third wavelength band; a third transmission region in which light on the long wavelength side of the third wavelength band light and the second wavelength band light is selected as fourth wavelength band light; and a fourth transmission region that selects fifth wavelength band light that is light on a short wavelength side of the first wavelength band light and the second wavelength band light. Thus, the wavelength component of the third wavelength band light side and the wavelength component of the second wavelength band light side can be adjusted by a simple configuration.

Further, the combining means includes a first dichroic mirror 151 that reflects light other than the first wavelength side of the second wavelength band light and transmits the third wavelength band light, or transmits light other than the first wavelength side of the second wavelength band light and reflects the third wavelength band light, thereby guiding the light other than the first wavelength side of the second wavelength band light and the third wavelength band light to the color wheel 201A side. This makes it possible to easily combine the second wavelength band light and the third wavelength band light on the same optical path.

The third transmissive region of the color wheel is configured to transmit light on the second long wavelength side, which is a wavelength side shorter than the first long wavelength side, of the third wavelength light and the second wavelength light combined by the first dichroic mirror 151, out of the light other than the first long wavelength side. This makes it possible to brighten the light on the third wavelength band light side emitted as the light source light.

In addition, the control section 38 controls the first output period T50a, the second output period T50b, the third output period T50c, and the fourth output period T50d in time division, and the first output period T50a irradiates the second wavelength band light to the fourth transmission region of the color wheel 201A as the first output pattern; the second output period T50b irradiates the first band of wavelengths of light to the second transmission region of the color wheel; the third output period T50c irradiates the second and third wavelength bands of light to the third transmission region of the color wheel; the fourth output period T50d irradiates the second and third wavelength bands of light to the second transmission region of the color wheel. Therefore, the amount of light of the same color system when the light of the third wavelength band is emitted can be increased, and the color purity can be improved by removing a part of the component on the long wavelength side when the light of the second wavelength band is emitted.

In addition, the control section 38 controls the first output period T50a, the second output period T50b, the third output period T50c, and the fourth output period T50d in time division, and the first output period T50a irradiates the second wavelength band light to the second transmission region of the color wheel as the second output pattern; the second output period T50b irradiates the fourth transmission region of the color wheel with the light of the first wavelength band; the third output period T50c irradiates the second and third wavelength bands of light to the second transmission region of the color wheel; the fourth output period T50d irradiates the second and third wavelength bands of light to the third transmission region of the color wheel. Therefore, the light quantity on the third wavelength band light side and the light quantity on the second wavelength band light side can be increased, and the luminance can be improved as a whole.

In the third output mode, the first wavelength band light which excites the second wavelength band light is output with a light intensity smaller than the first wavelength band light output in the first output period T50a, the second output period T50b, and the fourth output period T50d in the third output period T50 c. Accordingly, in the third output period T50c and the fourth output period T50d, the light source light that emits the light on the third wavelength band side can be emitted, and the light amount of the light on the third wavelength band side can be increased, so that the color purity as a whole can be increased.

Further, according to the light source control method of the light source device 60, the control unit 38 can reduce the flicker of the image projected onto the screen when the phase is changed by changing the relative phase of the color wheels 201A and 201B with respect to the fluorescent wheel 101 to the target movement angle in a stepwise manner for each of the plurality of divided movement angles and switching to the plurality of output modes for emitting different light source lights. Further, since the change in the phase velocity is small, it is possible to reduce the driving sound generated from the motor 210 or suppress the increase in the driving current accompanying the phase change of the motor 210.

Further, when shifting the phase of the color wheel 201A, the control unit 38 checks the completion of the shift for each divided shift angle, and the light source device 60 that has changed to the target shift angle improves the followability with respect to the control signal, and can reduce the occurrence of overshoot or undershoot even after reaching the target shift angle.

In addition, the first light emitting element is a blue laser diode 71, the second light emitting element is a red light emitting diode 121, the first wavelength band light is blue wavelength band light, the second wavelength band light is green wavelength band light, and the third wavelength band light is red wavelength band light. This makes it possible to configure the light source device 60 capable of projecting a color image with improved color balance.

The embodiments described above are provided as examples, and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.