阅读说明：本技术 光学轮装置、光源装置以及投影装置 (Optical wheel device, light source device, and projection device ) 是由 望月豪彦 于 2019-05-27 设计创作，主要内容包括：本发明提供一种光学轮装置,其特征在于,具有：第一轮,其在一面侧配置有荧光体层；第二轮,其配置于上述第一轮的另一面侧；第一开口部,其设于上述第一轮或者上述第二轮,并设于旋转中心侧；第二开口部,其设于比上述第一开口部靠外周侧；连通路,其形成于上述第一轮与上述第二轮之间,使上述第一开口部与上述第二开口部连通；马达,其对上述第一轮以及上述第二轮进行旋转驱动；以及驱动控制装置,其对上述马达进行驱动控制。(The present invention provides an optical wheel device, comprising: a first wheel having a phosphor layer disposed on one surface side; a second wheel disposed on the other surface side of the first wheel; a first opening provided in the first wheel or the second wheel and provided on a rotation center side; a second opening provided on the outer periphery side of the first opening; a communication passage formed between the first wheel and the second wheel and communicating the first opening portion with the second opening portion; a motor that rotationally drives the first wheel and the second wheel; and a drive control device for controlling the drive of the motor.)

1. An optical wheel apparatus, comprising:

A first wheel having a phosphor layer disposed on one surface side;

a second wheel disposed on the other surface side of the first wheel;

A first opening provided in the first wheel or the second wheel and provided on a rotation center side;

A second opening provided on the outer periphery side of the first opening;

A communication passage formed between the first wheel and the second wheel and communicating the first opening portion with the second opening portion;

A motor that rotationally drives the first wheel and the second wheel; and

and a drive control device for controlling the drive of the motor.

2. Optical wheel device according to claim 1,

The second opening is formed in an outer peripheral side surface between the first wheel and the second wheel.

3. Optical wheel device according to claim 1,

The second opening is formed in the first wheel or the second wheel.

4. Optical wheel device according to claim 1,

The first opening and the second opening are provided in plural numbers, respectively, and the communication path is formed for each of the first opening and the second opening.

5. Optical wheel device according to claim 2,

The first opening and the second opening are provided in plural numbers, respectively, and the communication path is formed for each of the first opening and the second opening.

6. Optical wheel device according to claim 3,

the first opening and the second opening are provided in plural numbers, respectively, and the communication path is formed for each of the first opening and the second opening.

7. Optical wheel device according to claim 1,

The communication path is formed in an arc shape.

8. Optical wheel device according to claim 1,

the first opening is provided on the motor side.

9. A light source device, comprising:

An optical wheel device as claimed in any one of claims 1 to 8; and

And an excitation light irradiation device including a semiconductor light emitting element for exciting the phosphor layer.

10. a projection apparatus, comprising:

The light source device of claim 9;

a display element which is irradiated with light source light from the light source device to form image light;

A projection-side optical system that projects the image light emitted from the display element onto a screen; and

And a projector control unit that controls the display element and the light source device.

Technical Field

The present invention relates to an optical wheel device, a light source device provided with the optical wheel device, and a projection device provided with the light source device.

Background

In recent years, data projectors are widely used as image projection apparatuses that project images such as screens of personal computers, video images, and images of image data stored in memory cards onto screens. This projector focuses light emitted from a light source on a micromirror display element called a DMD (digital micromirror device) or a liquid crystal panel, and displays a color image on a screen.

In addition, with the spread of video equipment such as personal computers and DVD players, the projector, which is the projector, has been used in a wide range of applications from business presentations to home use. In such a projector, a high-luminance discharge lamp is currently the mainstream as a light source, but in recent years, various projection apparatuses have been developed which use a plurality of semiconductor light emitting elements such as laser diodes as a light source and which are provided with a fluorescent plate using the semiconductor light emitting elements as an excitation light source.

jp 2017-191280 a discloses a projector including an optical wheel (rotating fluorescent plate) having a wavelength conversion element.

In the optical wheel (rotating phosphor plate) disclosed in japanese patent application laid-open No. 2017-191280, the light emission efficiency decreases as the temperature of the phosphor layer (wavelength conversion element) increases. Therefore, in order to improve the light emission efficiency of the fluorescent light, the temperature of the phosphor layer needs to be lowered, and a high cooling effect is desired.

Disclosure of Invention

the invention aims to provide an optical wheel device, a light source device and a projection device with high cooling effect of a fluorescent layer.

the present invention in claim 1 is an optical wheel device, comprising:

A first wheel having a phosphor layer disposed on one surface side;

a second wheel disposed on the other surface side of the first wheel;

a first opening provided in the first wheel or the second wheel and provided on a rotation center side;

A second opening provided on the outer periphery side of the first opening;

A communication passage formed between the first wheel and the second wheel and communicating the first opening portion with the second opening portion;

A motor that rotationally drives the first wheel and the second wheel; and

And a drive control device for controlling the drive of the motor.

case 2 is the optical wheel device according to case 1, characterized in that,

The second opening is formed in an outer peripheral side surface between the first wheel and the second wheel.

Case 3 is the optical wheel device according to case 1, characterized in that,

The second opening is formed in the first wheel or the second wheel.

Case 4 is the optical wheel apparatus according to case 1, characterized in that,

The first opening and the second opening are provided in plural numbers, respectively, and the communication path is formed for each of the first opening and the second opening.

Case 5 is the optical wheel device according to case 2, characterized in that,

The first opening and the second opening are provided in plural numbers, respectively, and the communication path is formed for each of the first opening and the second opening.

case 6 is the optical wheel apparatus according to case 3, characterized in that,

The first opening and the second opening are provided in plural numbers, respectively, and the communication path is formed for each of the first opening and the second opening.

Case 7 is the optical wheel apparatus according to case 1, characterized in that,

The communication path is formed in an arc shape.

case 8 is the optical wheel device according to case 1, characterized in that,

The first opening is provided on the motor side.

The light source device according to claim 9 is characterized by including:

the optical wheel device according to any one of aspects 1 to 8; and

And an excitation light irradiation device including a semiconductor light emitting element for exciting the phosphor layer.

The projection apparatus according to claim 10 is characterized by comprising:

The light source device according to claim 9;

a display element which is irradiated with light source light from the light source device to form image light;

a projection-side optical system that projects the image light emitted from the display element onto a screen; and

and a projector control unit that controls the display element and the light source device.

drawings

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

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

fig. 3 is an exploded perspective view showing an optical wheel and a motor of the optical wheel device according to the embodiment of the present invention.

Fig. 4A is a view showing an optical wheel and a motor of the optical wheel device according to the embodiment of the present invention, and is a front view seen from the incident side of excitation light.

Fig. 4B is a view showing an optical wheel and a motor of the optical wheel device of the embodiment of the present invention, and is a sectional view a-a of fig. 4A.

Fig. 5A is a schematic cross-sectional view showing modification 1 of the optical wheel according to the embodiment of the present invention.

fig. 5B is a schematic cross-sectional view showing modification 2 of the optical wheel according to the embodiment of the present invention.

Fig. 5C is a schematic sectional view showing modification 3 of the optical wheel according to the embodiment of the present invention.

Fig. 5D is a schematic sectional view showing modification 4 of the optical wheel according to the embodiment of the present invention.

Fig. 6E is a schematic cross-sectional view showing modification 5 of the optical wheel according to the embodiment of the present invention.

Fig. 6F is a schematic sectional view showing modification 6 of the optical wheel according to the embodiment of the present invention.

Fig. 6G is a schematic cross-sectional view showing modification 7 of the optical wheel according to the embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a diagram showing functional circuit blocks of a projector control unit of the projector 10. The projector control unit includes a control unit 38, an input/output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like.

the control unit 38 controls the operation of each circuit in the projection apparatus 10, and is configured by a CPU, a ROM in which operation programs such as various settings are fixedly stored, a RAM used as a work memory, and the like.

Then, the control means collectively converts the image signals of various specifications input from the input/output connector section 21 into image signals of a predetermined format suitable for display by the image conversion section 23 via the input/output interface 22 and the System Bus (SB), and outputs the converted image signals to the display encoder 24.

Then, 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 functions as display device control means for driving the display device 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.

in the projection apparatus 10, the display element 51 is irradiated with the light beam emitted from the light source device 60 through the optical system, so that a light image is formed by the reflected light from the display element 51, and the image is projected and displayed on a screen, not shown, through the projection-side optical system. The movable lens group 235 of the projection optical system is driven by a lens motor 45 for zoom adjustment and focus adjustment.

The image compression/decompression section 31 performs the following recording processing: the luminance signal and the color difference signal of the image signal are data-compressed by ADCT, huffman coding, and the like, and are sequentially written into the memory card 32, which is regarded as a removable recording medium.

Further, the image compression/decompression section 31 performs the following processing: in the playback mode, the image data recorded in the memory card 32 is read, and each piece of image data constituting a series of moving images is decompressed for each frame, and the image data is output to the display encoder 24 via the image conversion unit 23, so that the moving images and the like can be displayed based on the image data stored in the memory card 32.

Then, an operation signal of the key/pointer unit 37 including a main key, a pointer, and the like provided in the housing of the projector apparatus 10 is directly transmitted to the control unit 38, a key operation signal from the remote controller is received by the Ir receiving unit 35 and demodulated by the Ir processing unit 36, and a demodulated code signal is output to the control unit 38.

The audio processing unit 47 is connected to the control unit 38 via a System Bus (SB). The audio processing unit 47 includes an audio source circuit such as a PCM audio source, and simulates audio data in a projection mode and a reproduction mode, and drives a speaker 48 to amplify and reproduce the audio data.

the control unit 38 controls a light source control circuit 41 as light source control means, and the light source control circuit 41 controls the light emission of each of the red light source device, the green light source device, and the blue light source device of the light source device 60 independently so that light of a predetermined wavelength band required for image generation is emitted from the light source device 60.

The control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature 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. The control unit 38 also performs the following control: the cooling fan drive control circuit 43 is controlled by a timer or the like to continue the rotation of the cooling fan even after the power supply to the main body of the projection apparatus 10 is turned off, or to turn 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.

next, the internal structure of the projector apparatus 10 will be explained. Fig. 2 is a schematic top view showing the internal configuration of the projection apparatus 10. Here, the housing of the projection apparatus 10 is formed in a substantially box shape, and includes an upper surface, a lower surface, a front panel 12, a rear panel 13, a right side panel 14, and a left side panel 15. In the following description, the left and right of the projection device 10 indicate the left and right direction with respect to the projection direction, and the front and rear indicate the front and rear direction with respect to the screen side direction of the projection device 10 and the advancing direction of the light beam.

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 light source device 60 is provided at a side of the control circuit board 241 of the projection apparatus 10, that is, at a substantially central portion of the casing of the projection apparatus 10. In the projection apparatus 10, the light source side optical system 170 and the projection side optical system 220 are disposed between the light source device 60 and the left side panel 15.

the light source device 60 includes an excitation light irradiation device 70 as a light source of blue wavelength band light and as an excitation light source, a red light source device 120 as a light source of red wavelength band light, and a green light source device 80 as a light source of green wavelength band light. The green light source device 80 is constituted by the excitation light irradiation device 70 and the optical wheel device 100. Further, a light guide optical system 140 for guiding the blue wavelength band light, the green wavelength band light, and the red wavelength band light is disposed in the light source device 60. The light guide optical system 140 condenses the light of each color wavelength band emitted from each of the color light source devices 70, 80, and 120 on the entrance port of the light tunnel 175.

the excitation light shining device 70 is disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the housing of the projection apparatus 10. The excitation light shining device 70 includes a light source group including a blue laser diode 71, a mirror group 75, a condenser lens 78, a heat sink 81, and the like. The light source group is composed of a plurality of blue laser diodes 71 as semiconductor light emitting elements arranged with their optical axes parallel to the rear panel 13. The mirror group 75 changes the optical axis of the outgoing light from each blue laser diode 71 by 90 degrees to the front panel 12 direction. The condenser lens 78 condenses the light emitted from each blue laser diode 71 reflected by the mirror group 75. The heat sink 81 is disposed between the blue laser diode 71 and the right side plate 14.

the light source group is formed by arranging a plurality of blue laser diodes 71 as semiconductor light emitting elements in a matrix. Further, a collimator lens 73 is disposed on the optical axis of each blue laser diode 71, and the collimator lens 73 converts the light emitted from each blue laser diode 71 into parallel light, respectively, so as to improve the directivity of the emitted light. The mirror group 75 is formed by arranging a plurality of mirrors in a stepwise manner and adjusting the positions of the mirrors integrally with the mirror substrate 76, and the cross-sectional area of the light beam emitted from the blue laser diode 71 is reduced in one direction and then emitted to the condenser lens 78.

A cooling fan 261 is disposed between the heat sink 81 and the rear panel 13, and the blue laser diode 71 is cooled by the cooling fan 261 and the heat sink 81. A cooling fan 261 is further disposed between the mirror group 75 and the rear panel 13, and the mirror group 75 and the condenser lens 78 are cooled by the cooling fan 261.

The red light source device 120 includes a red light source 121 whose optical axis is arranged parallel to the blue laser diode 71, and a condenser lens group 125 that condenses light emitted from the red light source 121. The red light source 121 is a red light emitting diode as a semiconductor light emitting element that emits light in a red wavelength band. The red light source device 120 is disposed such that the optical axis of the red wavelength band light emitted from the red light source device 120 intersects with the optical axis of the blue wavelength band light emitted from the excitation light shining device 70 and the optical axis of the green wavelength band light emitted from the optical wheel 101. The red light source device 120 includes a heat sink 130 disposed on the right side panel 14 of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261 and the heat sink 130.

The optical wheel device 100 constituting the green light source device 80 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 optical wheel device 100 includes: an optical wheel 101 disposed in parallel with the front panel 12, i.e., orthogonal to the optical axis of the exit light from the excitation light irradiation device 70; a motor 110 for rotationally driving the optical wheel 101; a drive control device, not shown, for controlling the motor 110; a condenser lens group 111 that condenses the light beam of the excitation light emitted from the excitation light irradiation device 70 on the optical wheel 101, and condenses the light beam emitted from the optical wheel 101 toward the back panel 13; and a condenser lens 115 that condenses the light flux emitted from the optical wheel 101 toward the front panel 12. The drive control device is controlled by the light source control circuit 41 described above. A cooling fan 261 is disposed between the motor 110 and the front panel 12, and the optical wheel device 100 and the like are cooled by the cooling fan 261. The optical wheel 101 of the optical wheel apparatus 100 is explained in detail below.

The light guide optical system 140 includes a condenser lens for condensing the light fluxes of red, green, and blue wavelength bands, a mirror for converting the optical axes of the light fluxes of the respective wavelength bands to the same optical axis, a dichroic mirror, and the like. Specifically, the first dichroic mirror 141 is disposed in the light guide optical system 140, and at a position where the red wavelength band light emitted from the red light source device 120 intersects with the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the optical wheel 101, the first dichroic mirror 141 transmits both the blue and red wavelength band light, reflects the reflected green wavelength band light, and converts the optical axis of the green wavelength band light by 90 degrees to the left side panel 15 direction.

further, a first reflecting mirror 143 is disposed on the optical axis of the blue wavelength band light transmitted or diffused through the optical wheel 101, that is, between the condenser lens 115 and the front panel 12, and the first reflecting mirror 143 reflects the blue wavelength band light and converts the optical axis of the blue light by 90 degrees to the direction of the left panel 15. A condenser lens 146 is disposed on the left side panel 15 side of the first reflecting mirror 143, and a second reflecting mirror 145 is disposed on the left side panel 15 side of the condenser lens 146. A condenser lens 147 is disposed on the rear panel 13 side of the second reflecting mirror 145. The second reflecting mirror 145 converts the optical axis of the blue wavelength band light reflected by the first reflecting mirror 143 and incident via the condenser lens 146 by 90 degrees to the rear panel 13 side.

Further, a condenser lens 149 is disposed on the left side panel 15 side of the first dichroic mirror 141. Further, a second dichroic mirror 148 is disposed on the left side panel 15 side of the condenser lens 149 and on the rear side panel 13 side of the condenser lens 147. The second dichroic mirror 148 reflects the red-band light and the green-band light, changes the optical axis by 90 degrees to the rear panel 13 side, and transmits the blue-band light.

The optical axis of the red wavelength band light transmitted by the first dichroic mirror 141 and the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 are incident on the condenser lens 149 so as to coincide with the optical axis of the red wavelength band light. The red and green wavelength band light transmitted through the condenser lens 149 is reflected by the second dichroic mirror 148, and is condensed at the entrance of the light tunnel 175 via the condenser lens 173 of the light source side optical system 170. On the other hand, the blue wavelength band light transmitted through the condenser lens 147 is transmitted through the second dichroic mirror 148, and then condensed at the entrance of the light tunnel 175 via the condenser lens 173.

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

A condenser lens 173 that condenses the light source light at the entrance of the light tunnel 175 is disposed near the light tunnel 175. Thus, the light in the red wavelength band, the light in the green wavelength band, and the light in the blue wavelength band are condensed by the condenser lens 173 and enter the light tunnel 175. The light beam incident on the light tunnel 175 passes through the light tunnel 175 to become a light beam with a uniform intensity distribution.

An optical axis conversion mirror 181 is disposed on the optical axis of the light tunnel 175 on the back panel 13 side via a condenser lens 178. The bundle of light rays emitted from the exit port of the light tunnel 175 is condensed by the condenser lens 178, and then the optical axis is changed to the left side panel 15 side by the optical axis changing mirror 181.

The light beam reflected by the optical axis changing mirror 181 is condensed by the condenser lens 183, and then irradiated to the display element 51 at a predetermined angle by the irradiation mirror 185 via the condenser lens 195. Further, a heat sink 190 is provided on the rear panel 13 side of the display element 51 which is regarded as a DMD, and the display element 51 is cooled by the heat sink 190.

The bundle of light rays, which is the light source light irradiated to the image forming surface of the display element 51 by the light source side optical system 170, is reflected by the image forming surface of the display element 51, and then projected as projection light to the screen via the projection side optical system 220. Here, the projection side optical system 220 is composed of a condenser 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. The movable lens group 235 and the fixed lens group 225 are built in the fixed barrel. Therefore, the fixed lens barrel including the movable lens group 235 is a variable focus lens, and is formed to be capable of zoom adjustment and focus adjustment.

By configuring the projection apparatus 10 in this manner, when the optical wheel 101 is rotated and the light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, the light of each wavelength band of red, green, and blue is sequentially incident on the condenser lens 173 and the light tunnel 175 via the light guide optical system 140 and is incident on the display element 51 via the light source side optical system 170, and the light of each color is time-divisionally displayed on the DMD, which is the display element 51 of the projection apparatus 10, based on the DMD data, whereby a color image can be projected on the screen.

next, the optical wheel 101 of the optical wheel device 100 will be described in detail. Fig. 3 is a partially exploded perspective view of the optical wheel 101 of the optical wheel device 100. The optical wheel 101 includes a first wheel 310, a second wheel 320, a third wheel 330, and a balance wheel 340, and is formed in a substantially disc shape. A phosphor layer 315 is disposed on one surface side (front surface side) of the first wheel 310. The second wheel 320 is disposed on the other surface side (back surface side) of the first wheel 310, and the third wheel 330 is sandwiched between the first wheel 310 and the second wheel 320.

The third wheel 330 is formed substantially in a disc shape. A mounting hole 331 which is regarded as a circular through hole is formed in the center of the third wheel 330. The mounting hole 331 is mounted on the motor shaft 361 of the motor 110. An arc-shaped hole 332 is formed in the outer periphery of the third wheel 330. The diffuse transmission member 300 is disposed in the hole 332, and the diffuse transmission member 300 is formed by forming a transparent base material into an arc shape and applying fine irregularities to the surface by sandblasting or the like. The diffuse transmission member 300 is fixed to the third wheel 330 by sandwiching both ends of the diffuse transmission member 300 from the back side and the front side of the diffuse transmission member 300 (third wheel 330) by both end portions of the cutout portion 322a of the second wheel 320 and both end portions of the cutout portion 312 of the first wheel 310, which will be described later. The third wheel 330 is formed with three arc notches 333a and 333b facing each other in an arc shape in a substantially radial shape. Each of the arc cutouts 333a and 333b is formed in a convex arc shape protruding in the rotation direction D1 of the optical wheel 101. The arc cutouts 333a and 333b are formed to face each other in the same shape, thereby maintaining the rotational balance of the third wheel 330.

The second wheel 320 is formed in a substantially disc shape, and has a mounting hole 321 in the center thereof, which is a through hole considered to be circular. The mounting hole 321 of the second wheel 320 is mounted on the motor shaft 361, similarly to the mounting hole 331 of the third wheel 330. Two notches 322a and 322b are formed in the outer peripheral portion of the second wheel 320 so as to face each other along the arc shape of the outer peripheral portion and partially cut open. Three circular holes 323a and 323b, which are regarded as through circular holes, are formed near the outer periphery of the mounting hole 321. The circular holes 323a and 323b are regarded as first opening portions 104 described later. The notches 322a and 322b and the circular holes 323a and 323b are arranged at different phases by 180 degrees, respectively. Therefore, in the second wheel 320, the notches 322a and 322b and the circular holes 323a and 323b are also provided to face each other, so that the rotational balance of the second wheel 320 is maintained.

The first wheel 310 is formed in a substantially disc shape, and has a mounting hole 311 formed at the center thereof as a through hole having a circular shape. The mounting hole 311 of the first wheel 310 is mounted on the motor shaft 361, similarly to the mounting hole 331 of the third wheel 330 and the mounting hole 321 of the second wheel 320. A notch 312 is formed in the outer peripheral portion of the first wheel 310 along the arc shape of the outer peripheral portion so as to be partially cut. A phosphor layer 315 is formed in a C-ring shape on the outer peripheral portion of the first wheel 310 so as to be juxtaposed with the notch 312. An opening 313 is formed between the mounting hole 311 and the phosphor layer 315 at a position facing the notch 312. The rotation balance of the first wheel 310 is maintained by the notch portion 312 and the opening portion 313.

The balance wheel 340 is formed in a substantially disc shape, and has a mounting hole 341 formed at the center thereof as a circular through hole. The mounting hole 341 of the balance wheel 340 disposed on the front surface side of the first wheel 310 is fixed to the motor shaft 361. That is, the second wheel 320, the third wheel 330, the first wheel 310, and the balance wheel 340 are stacked in this order from the motor 110 side and fixed to the motor shaft 361.

In the optical wheel 101, as shown in fig. 4A, the diffuse transmission member 300 is exposed from the cutout portion 312 of the first wheel 310. Therefore, the phosphor layer 315 and the diffuse transmission member 300 are continuously juxtaposed in the circumferential direction. Here, the phosphor layer 315 is a fluorescent light emitting region that receives, as excitation light, emission light emitted from the excitation light irradiation device 70 of fig. 2 through the condensing lens group 111 and emits fluorescent light in the green wavelength band. The region of the diffuse transmission member 300 exposed from the cutout 312 is a diffuse transmission region through which the light emitted from the excitation light shining device 70 is diffusely transmitted.

the base material of the first wheel 310 is a metal base material made of copper, aluminum, or the like, and the surface of the base material on the side of the excitation light irradiation device 70 is processed into a mirror. Then, a phosphor layer 315 of a green phosphor is laid on the surface processed into a mirror to form a luminescent light emitting region.

when the phosphor layer 315 is irradiated with the blue wavelength band light as the excitation light from the excitation light irradiation device 70, the green phosphor in the phosphor layer 315 is excited, and the green wavelength band light is emitted from the green phosphor in all directions. The light beam emitted by the fluorescence is emitted toward the rear panel 13 and then enters the condenser lens group 111. On the other hand, the blue wavelength band light is incident from the excitation light shining device 70 to the diffuse transmission region in the optical wheel 101, which transmits or diffusely transmits the incident light, and the blue wavelength band light is transmitted or diffusely transmits from the optical wheel 101, and then is incident to the condenser lens 115 disposed on the back surface side (i.e., the front panel 12 side) of the optical wheel 101.

in the optical wheel 101, the arc-shaped proximal ends of the arc notches 333a and 333b of the third wheel 330 coincide with the circular holes 323a and 323b of the second wheel 320 in front view. In the present embodiment, the diameter dimensions of the circular holes 323a and 323b are substantially the same as the width dimensions of the circular-arc cutouts 333a and 333 b. Further, as shown in fig. 4B, the circular arc cutouts 333a, 333B form a space regarded as the communication path 105 between the first wheel 310 and the second wheel 320. The end of the communication path 105 opens on the outer peripheral side surface of the third wheel 330 between the first wheel 310 and the second wheel 320, and is formed as a second opening 105a on the outer peripheral side of the circular holes 323a, 323b regarded as the first opening 104. Thus, the communication path 105 includes the second opening 105a that opens to the outside air, and the first opening 104 communicates with the outside air.

The optical wheel 101 is rotated by the motor 110 in a rotation direction D1 shown in fig. 4A. When the optical wheel 101 rotates, the first opening 104, the communication path 105, and the second opening 105a that communicate with each other generate negative pressure due to the second opening 105a that opens at the outermost periphery of the optical wheel 101. Thus, as shown by an arrow AF in fig. 4B, an air flow is generated which flows in from the first opening 104, passes through the communication path 105, and is then discharged from the second opening 105 a. In this way, by generating air flow in the communication path 105 between the first wheel 310 and the second wheel 320 as the inside of the optical wheel 101, the first wheel 310 and the phosphor layer 315 can be cooled. Further, by forming the first opening 104 in the vicinity of the motor 110 side, the motor 110 can be cooled.

Further, the communication path 105 is formed by the arc notches 333a and 333b having a convex arc shape with respect to the rotation direction D1 at the portion of the second opening 105a, and thus can be formed in a shape in which entrainment of air due to rotation of the optical wheel 101 is less likely to occur, and air can be smoothly discharged from the second opening 105 a.

Next, fig. 5A to 5D and fig. 6E to 6G show modifications 1 to 7 of the present embodiment. Fig. 5A to 5D and fig. 6E to 6G show half cross sections of the motor shaft 361 (optical wheel 101) with respect to the shaft center CL.

(modification 1)

The optical wheel 101A in modification 1 shown in fig. 5A includes a first wheel 310A having a phosphor layer 315 laid on one surface side and a second wheel 320A disposed on the other surface side of the first wheel 310A. In this way, the two-layer structure of the first wheel 310A and the second wheel 320A can be applied mainly when the phosphor layer 315 is formed in an annular shape (the entire circumference). In this case, unlike the internal structure shown in fig. 2, the excitation light shining device 70 and the other blue semiconductor light emitting elements are provided at the same time, and the second wheel 320A is provided with the first opening 104A, and the second opening 105Aa of the communication path 105A is formed on the outer peripheral side surface of the optical wheel 101A (the first wheel 310A and the second wheel 320A). Here, the communication path 105A is formed, for example, by forming a radial slit on the other surface side of the first wheel 310A and combining it with the second wheel 320A.

(modification 2)

The optical wheel 101B in modification 2 shown in fig. 5B includes a first wheel 310B having a phosphor layer 315 laid on one surface side, and a second wheel 320B disposed on the other surface side of the first wheel 310B. The second wheel 320B is provided with a first opening 104B and a second opening 105Ba of the communication path 105B. Second opening 105Ba is formed on the outer periphery side of first opening 104B.

(modification 3)

The optical wheel 101C in modification 3 shown in fig. 5C includes a first wheel 310C having a phosphor layer 315 laid on one surface side, and a second wheel 320C disposed on the other surface side of the first wheel 310C. The first opening 104C is formed in the second wheel 320C, and the second opening 105Ca of the communication path 105C is formed in the first wheel 310C. Second opening 104Ca is formed on the outer periphery side of first opening 104C.

(modification 4)

in the optical wheel 101D of modification 4 shown in fig. 5D, a phosphor layer 315 is disposed on the motor 110 side. In this case, the phosphor layer 315 is also laid on one surface side of the first wheel 310D, and the second wheel 320D is arranged on the other surface side of the first wheel 310D. The first wheel 310D is formed with a first opening 104D. The first opening 104D communicates with the outside air through a communication path 105D having a second opening 105 Da. Second opening 105Da is formed on the outer peripheral side of first opening 104D.

(modification 5)

The optical wheel 101E in modification 5 shown in fig. 6E includes a first wheel 310E having a phosphor layer 315 laid on one surface side, and a second wheel 320E disposed on the other surface side of the first wheel 310E. Further, the first opening 104E is formed in the first wheel 310E, and the second opening 105Ea of the communication path 105E is formed in the second wheel 320E. The second opening 105Ea is formed on the outer peripheral side of the first opening 104E.

(modification 6)

The optical wheel 101F in modification 6 shown in fig. 6F includes a first wheel 310F having a phosphor layer 315 laid on one surface side, and a second wheel 320F disposed on the other surface side of the first wheel 310F. Further, the first opening 104F is formed in the first wheel 310F, and the second opening 105Fa of the communication passage 105F is formed in the first wheel 310F. Second opening 105Fa is formed on the outer peripheral side of first opening 104F.

(modification 7)

The optical wheel 101G in modification 7 shown in fig. 6G includes a first wheel 310G having a phosphor layer 315 laid on one surface side, and a second wheel 320G disposed on the other surface side of the first wheel 310G. Further, first opening 104G is formed in first wheel 310G, and second opening 105Ga of communication path 105G is formed in the outer peripheral side surface of optical wheel 101G (first wheel 310G and second wheel 320G). Second opening 105Ga is formed on the outer periphery side of first opening 104G.

As described above, according to the embodiment of the present invention, the optical wheels 101, 101A to 101G of the optical wheel device 100 include: first wheels 310, 310A to 310G having a phosphor layer 315 disposed on one surface side; second wheels 320, 320A to 320G arranged on the other surface side of the first wheels 310, 310A to 310G; first openings 104, 104A to 104G provided in the first wheels 310, 310A to 310G or the second wheels 320, 320A to 320G and provided on the rotation center side; second openings 105a, 105Aa to 105Ga provided on the outer periphery side of the first openings 104, 104A to 104G; and communication passages 105, 105A to 105G formed between the first wheels 310, 310A to 310G and the second wheels 320, 320A to 320G and communicating the first openings 104, 104A to 104G with the second openings 105A, 105Aa to 105 Ga.

Accordingly, in the communication paths 105, 105A to 105G inside the optical wheels 101, 101A to 101G for disposing the phosphor layers 315, air flows from the first openings 104, 104A to 104G to the communication paths 105, 105A to 105G by the rotation of the optical wheels 101, 101A to 101G, and the phosphor layers 315 can be efficiently cooled.

The second openings 105a, 105Aa, 105Da, and 105Ga are formed on the outer peripheral side surfaces between the first wheels 310, 310A, 310D, and 310G and the second wheels 320, 320A, 320D, and 320G. Thus, the second openings 105A, 105Aa, 105Da, and 105Ga are opened in the centrifugal direction of the optical wheels 101, 101A, and 101G, so that the negative pressure at the second openings 105A, 105Aa, 105Da, and 105Ga is increased, and the flow rate of the air flowing from the first openings 104, 104A, 104D, and 104G into the communication passages 105, 105A, 105D, and 105G and discharged therefrom can be increased.

the second openings 105B, 105Ca, 105Ea, and 105Fa are formed in the first wheels 310B, 310C, 310E, and 310F or the second wheels 320B, 320C, 320E, and 320F. This makes it easy to make the sizes of the second openings 105Ba, 105Ca, 105Ea, and 105Fa the same as the sizes of the first openings 104B, 104C, 104E, and 104F, for example, and air can be efficiently circulated.

The first openings 104 and 104A to 104G are provided in plural, and communication paths 105 and 105A to 105G are formed for the first openings 104 and 104A to 104G, respectively. This can increase the flow rate of air flowing through the inside of the optical wheels 101 and 101A to 101G, and can cool the phosphor layer 315 more effectively.

The communication path 105 is formed in an arc shape. This can reduce entrainment of air into the second opening 105a formed at the end of the communication passage 105, and can efficiently generate negative pressure at the second opening 105 a.

The first openings 104, 104A to 104D are provided on the motor 110 side. Thus, the first openings 104, 104A to 104D are disposed in the vicinity of the motor 110, and the air flowing through the communication passages 105, 105A to 105D from the first openings 104, 104A to 104D can also contribute to cooling of the motor 110.

The optical wheel 101 has a three-layer structure in which the diffuse transmission member 300 is disposed on the third wheel 330 and the diffuse transmission member 300 is sandwiched between the first wheel 310 and the second wheel 320, and the first opening 104 and the communication path 105 can be formed in the optical wheel 101.

In the optical wheel 101 having the three-layer structure, the phosphor layer 315 may be formed in an annular shape (the entire circumference).

The projection apparatus 10 includes a light source device 60 including the optical wheel device 100. This can provide the light source device 60 and the projection device 10 having a high cooling effect of the phosphor layer 315.

The embodiments described above are presented as examples and are not intended to limit the scope of the invention. The above-described new embodiment can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. The above-described 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.