阅读说明：本技术 发热装置、光源装置以及投影装置 (Heat generating device, light source device, and projection device ) 是由 井上贵彦 于 2019-12-17 设计创作，主要内容包括：本发明提供了一种发热装置,包括以下：发热部；第1盖,覆盖所述发热部的至少一部分,在一侧形成第1开口部,在与所述一侧相对的另一侧形成第2开口部；以及第2盖,配置在所述第1盖的外侧,形成从所述第1开口部向所述第2开口部引导的流路；从所述第1盖的下端至所述第1开口部的开口中心的高度比从所述第1盖的下端至所述第2开口部的开口中心的高度高。(The invention provides a heating device, comprising the following components: a heat generating portion; a 1 st cover covering at least a part of the heat generating portion, and having a 1 st opening formed at one side and a 2 nd opening formed at the other side opposite to the one side; and a 2 nd cover disposed outside the 1 st cover and forming a flow path leading from the 1 st opening to the 2 nd opening; the height from the lower end of the 1 st lid to the opening center of the 1 st opening is higher than the height from the lower end of the 1 st lid to the opening center of the 2 nd opening.)

1. A heat generating device, comprising:

a heat generating portion;

a 1 st cover covering at least a part of the heat generating portion, and having a 1 st opening formed at one side and a 2 nd opening formed at the other side opposite to the one side; and

a 2 nd cover disposed outside the 1 st cover and forming a flow path leading from the 1 st opening to the 2 nd opening,

the height from the lower end of the 1 st lid to the opening center of the 1 st opening is higher than the height from the lower end of the 1 st lid to the opening center of the 2 nd opening.

2. The heat-generating device according to claim 1,

the cross-sectional area of the 1 st opening is equal to or larger than the cross-sectional area of the 2 nd opening.

3. The heat-generating device according to claim 2,

the cross-sectional area of the flow path is equal to or larger than the cross-sectional area of the 1 st opening.

4. The heat-generating device according to any one of claims 1 to 3,

the heat generating portion is disposed on the one side inside the 1 st cover.

5. The heat-generating device according to any one of claims 1 to 4,

the 1 st opening is formed by a plurality of through holes, and the 2 nd opening is a long hole.

6. The heat-generating device according to any one of claims 1 to 5,

at least a part of the 1 st cover and at least a part of the 2 nd cover form a convex arc shape in side view, or the 1 st cover and the 2 nd cover form a hemisphere shape respectively.

7. The heat-generating device according to claim 6,

the 1 st cover has:

a 1 st front plate erected on the heat generating portion side and forming the plurality of through holes;

the 1 st back plate is vertically arranged at a position opposite to the 1 st front plate;

a 1 st upper plate formed in a convex arc shape so as to connect upper ends of the 1 st front plate and the 1 st rear plate; and

and the 21 st side plates are respectively connected with the two ends of the 1 st front plate and the two ends of the 1 st rear plate, and the upper ends of the 1 st side plates are connected with the 1 st upper plate.

8. The heat-generating device according to claim 7,

the 2 nd cover has:

a 2 nd front plate erected with a predetermined interval from the 1 st front plate;

a 2 nd rear plate erected with a predetermined interval from the 1 st rear plate;

a 2 nd upper plate having a convex circular arc shape and formed to connect upper ends of the 2 nd front plate and the 2 nd rear plate with a predetermined interval from the 1 st upper plate; and

and the 2 nd side plates are close to the 1 st side plates, the 2 nd front plates and the 2 nd rear plates are connected at two ends, and the upper ends of the 2 nd front plates and the 2 nd rear plates are connected with the 2 nd upper plate.

9. A light source device, comprising:

the heat-generating device of any one of claims 1 to 8;

an excitation light irradiation device for emitting light of the 1 st wavelength band; and

a semiconductor light emitting element for emitting light of a 2 nd wavelength band different from the 1 st wavelength band,

the heat generating unit includes a hub motor and an optical wheel that is rotated by the hub motor and has a fluorescent light emitting area that emits fluorescent light of a wavelength band different from the 1 st wavelength band light and the 2 nd wavelength band light.

10. A projection device, comprising:

the light source device of claim 9;

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

a projection optical system that projects image light formed by the display element to a screen; and

and a control unit, i.e., a CPU, for controlling the display element and the light source device.

Technical Field

The present invention relates to a heat generating device, a light source device having the heat generating device, and a projection device having the light source device.

Background

Japanese patent laid-open publication No. 2017-219747 discloses a projection apparatus having: an excitation light irradiation device including a blue laser diode; and an optical wheel device that emits fluorescent light by excitation of the excitation light from the excitation light irradiation device. One part of the optical wheel device is accommodated in the case, and the other part of the optical wheel device is covered by a wheel cover arranged on the case. A rectifying and radiating plate for cooling the optical wheel is arranged on the inner side of the wheel cover.

The dust resistance can be improved by covering a part of the optical wheel device with a wheel cover. However, there are cases where: the temperature of the periphery of the optical wheel, which uses the fluorescence emitting region excited by the excitation light as a heat generating portion, is likely to rise, and the temperature is further raised when the cover is sealed. Therefore, in the wheel cover disclosed in japanese patent application laid-open No. 2017-219747, there are also cases where: air flows are generated on the front side of the optical wheel, and cooling is insufficient.

The invention aims to provide a heating device with a cover capable of improving the cooling efficiency of a heating part, a light source device with the heating device and a projection device with the light source device.

Disclosure of Invention

The present invention relates to a heat generating device, including:

a heat generating portion;

a 1 st cover covering at least a part of the heat generating portion, and having a 1 st opening formed at one side and a 2 nd opening formed at the other side opposite to the one side; and

a 2 nd cover disposed outside the 1 st cover and forming a flow path leading from the 1 st opening to the 2 nd opening,

the height from the lower end of the 1 st lid to the opening center of the 1 st opening is higher than the height from the lower end of the 1 st lid to the opening center of the 2 nd opening.

The invention also relates to a light source device comprising:

the above-described heat generating device;

an excitation light irradiation device for emitting light of the 1 st wavelength band; and

a semiconductor light emitting element for emitting light of a 2 nd wavelength band different from the 1 st wavelength band,

the heat generating unit includes a hub motor and an optical wheel that is rotated by the hub motor and has a fluorescent light emitting area that emits fluorescent light of a wavelength band different from the 1 st wavelength band light and the 2 nd wavelength band light.

The invention also relates to a projection device comprising:

the light source device described above;

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

a projection optical system that projects the image light formed by the display element onto a screen; and

and a control unit (CPU) for controlling the display element and the light source device.

Drawings

Fig. 1 is a diagram showing functional modules 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 a schematic plan view of the inside of an optical housing of a light source device according to an embodiment of the present invention.

Fig. 4 is a perspective view of the vicinity of the optical wheel device according to the embodiment of the present invention, shown in an exploded perspective view only of the wheel cover, as viewed from the optical wheel side.

Fig. 5 is a perspective view of the vicinity of the optical wheel device according to the embodiment of the present invention, shown in an exploded perspective view only of the wheel cover, as viewed from the hub motor side.

Fig. 6 is a cross-sectional view vi-vi of fig. 2 showing the wheel cover of the embodiment of the present invention only in cross section.

Fig. 7 is a vii-vii cross-sectional view of fig. 2 showing the wheel cover of an embodiment of the present invention in cross-section only.

Fig. 8 is a cross-sectional view of a wheel cover according to the embodiment of the present invention, which corresponds to the cross-section vi-vi in fig. 2, and is shown only in a cross-section.

Detailed Description

Embodiments of the present invention will be described below based on the drawings. Fig. 1 is a diagram showing functional circuit blocks of a projector control unit (control unit) of the projector 10. The projector control unit is constituted by the control unit 38, the input/output interface 22, the image conversion unit 23, the display encoder 24, the display drive unit 26, and the like.

The control unit 38 is a component responsible for controlling 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 unit converts the image signals of various specifications input from the input/output connection unit 21 into image signals of a predetermined format suitable for display by the image conversion unit 23 via the input/output interface 22 and the System Bus (SB), and outputs the converted image signals to the display encoder 24.

The display encoder 24 stores the input video signal in the video RAM25, generates a video signal from the contents stored in the video RAM25, and outputs the video signal to the display driver 26.

The display driving unit 26 functions as a display device control means, and drives the display device 51, which is a Spatial Optical 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 light beam emitted from the light source apparatus 60 is irradiated onto the display element 51 via the optical system, thereby forming a light image by the reflected light of the display element 51, and the image is projected and displayed on a screen, not shown, via the projection optical system. In addition, the movable lens group 235 of the projection optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

The image compression/expansion unit 31 compresses data on the luminance signal and the color difference signal of the image signal by ADCT, huffman coding, or the like, and performs a storage process of sequentially writing the data in a memory card 32 which is a removable storage medium.

Further, the image compressing/expanding unit 31 reads image data stored in the memory card 32 in the playback mode, expands each image data constituting a series of moving pictures in units of 1 frame, outputs the image data to the display encoder 24 via the image converting unit 23, and performs processing for realizing display of moving pictures and the like 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 sent to the control unit 38, a key operation signal from the remote controller is received by the Ir receiving unit 35, and an encoded signal demodulated by the Ir processing unit 36 is output to the control unit 38.

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

The control unit 38 controls a light source control circuit 41 as light source control means, and the light source control circuit 41 individually controls the light emission of the red light source device, the green light source device, and the blue light source device 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.

Further, 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 temperature detection result. Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform: the control of continuing the rotation of the cooling fan after the power supply of the projector apparatus 10 main body is turned off by a timer or the like, or turning off the power supply of the projector apparatus 10 main body based on the temperature detection result of the temperature sensor.

Next, the internal structure of the projection apparatus 10 is described based on fig. 2 and 3. Fig. 2 is a schematic plan view showing the internal structure of the projection apparatus 10. Here, the housing of the projector apparatus 10 is formed in a substantially box shape, and has 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 are indicated as the left and right directions with respect to the projection direction, and the front and rear are indicated as the front and rear directions with respect to the screen side direction of the projection device 10 and the traveling direction of the light beam emitted from the light emitting portion 12 a.

The projector 10 includes a power supply 301, a control circuit board 302, and a light source device 60. The projector apparatus 10 includes an intake fan 260, an intake fan 270, and an exhaust fan 280 as cooling fans.

The light source device 60 is disposed substantially at the center of the housing of the projection device 10. The light source device 60 has an optical housing 61. The optical housing 61 is opened at an upper portion thereof, and a cover 61a is mounted. Optical components such as a light source, a lens, and a mirror for each color are housed in the optical housing 61. The power supply device 301 is disposed on the left side panel 15 side of the light source device 60. The substrate of the power supply device 301 is disposed substantially parallel to the left side panel 15. The control circuit board 302 is disposed on the rear panel 13 side of the light source device 60. The control circuit board 302 is disposed substantially perpendicular to the vertical direction. The control circuit board 302 includes a power circuit module, a light source control module, and the like. The control circuit board 302 may be provided in plural, separated for each function of the power supply circuit module, the light source control module, and the like.

Here, the internal structure of the light source device 60 will be described. Fig. 3 is a schematic plan view of the optical case 61 of the light source device 60 with the cover 61a omitted. The light source device 60 includes a red light source device 120 (semiconductor light emitting element) as a light source of red band light (2 nd band light), a green light source device 80 as a light source of green band light, and a blue light source device as a light source of blue band light (1 st band light) and also an excitation light irradiation device 70 as an excitation light source. The green light source device 80 is composed of an excitation light irradiation device 70 and an optical wheel device 100 (heat generating device). The light source device 60 has a light guide optical system 140. The light guide optical system 140 combines the light fluxes of the green wavelength band light and the blue wavelength band light and the red wavelength band light to guide the light fluxes of the respective wavelength bands onto the same optical path.

The excitation light irradiation device 70 is disposed on the right side panel 14 side of the housing of the projection apparatus 10. The excitation light irradiation device 70 includes a plurality of semiconductor light emitting elements arranged parallel to the rear panel 13 and the optical axis. The semiconductor light emitting element of the present embodiment is a plurality of blue laser diodes 71 that emit light in the blue wavelength band. The plurality of blue laser diodes 71 are arranged in parallel with the right side plate 14. These blue laser diodes 71 are fixed on a support 74.

The excitation light irradiation device 70 includes a reflector 76, a diffusion plate 78, and a heat sink 81. The reflecting mirror 76 converts the optical axis of the light emitted from each blue laser diode 71 by substantially 90 degrees toward the diffuser plate 78. The diffusion plate 78 diffuses the light emitted from each blue laser diode 71 reflected by the reflecting mirror 76 at a predetermined diffusion angle. The heat sink 81 is disposed between the blue laser diode 71 and the right side panel 14.

On the optical path from each blue laser diode 71, a collimator lens 73 is provided for improving the directivity of the light emitted from the blue laser diode 71 and converting the light into parallel light. These collimator lenses 73 are held together with the blue laser diode 71 on a holder 74.

The red light source device 120 includes a red light source 121 whose optical axis is arranged parallel to the light flux of 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 light in the red wavelength band emitted from the red light source device 120 intersects the optical axis of the light in the green wavelength band emitted from the optical wheel 101 serving as a fluorescent plate. Further, the red light source device 120 has a heat sink 130 on the right side panel of the red light source 121.

The optical wheel device 100 (heat generating device) constituting the green light source device 80 includes a heat generating portion including an optical wheel 101 and an in-wheel motor 110, a condenser lens group 117 on an incident side, and a condenser lens 115 on an emission side. The optical wheel 101 is a fluorescent wheel disposed perpendicular to the optical axis of the light emitted from the excitation light irradiation device 70. The optical wheel 101 is rotationally driven by an in-wheel motor 110. The condenser lens group 117 condenses the light beam of the excitation light emitted from the excitation light irradiation device 70 onto the optical wheel 101. The condenser lens 115 condenses the light flux emitted from the optical wheel 101 toward the front panel 12. The optical wheel device 100 is disposed above the condenser lens group 117 and the condenser lens 115. Therefore, a part of the lower side of the optical wheel 101 is disposed on the optical path of the condenser lens group 117 and the condenser lens 115.

In the optical wheel 101, the fluorescent light emitting region and the diffusion transmission region are arranged in the circumferential direction. The fluorescent light emitting region laid on the optical wheel 101 receives the blue wavelength band light emitted from the blue laser diode 71 as excitation light, and emits the excited green wavelength band fluorescent light. The diffusion transmission region diffuses and transmits light emitted from the blue laser diode 71. The diffused and transmitted emitted light is emitted as light of the blue wavelength band of the light source device 60.

The optical wheel device 100 is covered with a wheel cover 500 (see fig. 2), and the optical wheel 101 and the in-wheel motor 110 are partially housed in the optical housing 61, and partially exposed from an opening 61b (see fig. 4 and 5) of the cover 61a of the optical housing 61 so as to avoid interference between the cover 61a and the optical wheel 101.

The wheel cover 500 covering a part of the optical wheel 101 which the optical wheel device 100 has is a double structure, and cooling of the optical wheel 101 and the like is achieved by silencing by Helmholtz theory and by air flow inside the wheel cover 500. The wheel cover 500 will be described later in detail.

The light guide optical system 140 includes a first dichroic mirror 141, a condenser lens 149, a second dichroic mirror 148, a first reflecting mirror 143, a condenser lens 146, a second reflecting mirror 145, and a condenser lens 147. The first dichroic mirror 141 is disposed at a position where 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 intersect with the red wavelength band light emitted from the red light source device 120. The first dichroic mirror 141 transmits the blue wavelength band light and the red wavelength band light, and reflects the green wavelength band light. The optical axis of the green band light reflected by the first dichroic mirror 141 is converted by 90 degrees toward the left side panel 15 of the condenser lens 149. Therefore, the optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 coincides with the optical axis of the green wavelength band light reflected by the first dichroic mirror 141.

The condenser lens 149 is disposed on the left side panel 15 side of the first dichroic mirror 141. The red wavelength band light transmitted through the first dichroic mirror 141 and the green wavelength band light reflected by the first dichroic mirror 141 are incident on the condenser lens 149 together. The second dichroic mirror 148 is on the left side panel 15 side of the condenser lens 149 and is arranged on the rear panel 13 side of the condenser lens 147. The second dichroic mirror 148 reflects the red wavelength band light and the green wavelength band light and transmits the blue wavelength band light. Therefore, the red-band light and the green-band light condensed by the condenser lens 149 are reflected by the second dichroic mirror 148 to be converted by 90 degrees on the rear panel 13 side. A condenser lens 173 is disposed on the rear panel 13 side of the second dichroic mirror 148. The red-band light and the green-band light reflected by the second dichroic mirror 148 are incident on the condenser lens 173.

The first reflecting mirror 143 is disposed on the optical axis of the light of the blue wavelength band transmitted through the optical wheel 101, that is, between the condenser lens 115 and the front panel 12. The first reflecting mirror 143 reflects the blue band light and converts the optical axis of the blue band light by 90 degrees in the direction of the left side panel 15. The condenser lens 146 is disposed on the left side panel 15 side of the first reflector 143. The second reflecting mirror 145 is disposed on the left side panel 15 side of the condenser lens 146. The second reflecting mirror 145 converts the optical axis of the light in the blue wavelength band reflected by the first reflecting mirror 143 and condensed by the condenser lens 146 by 90 degrees on the rear panel 13 side. The condenser lens 147 is disposed on the rear panel 13 side of the second reflecting mirror 145. The light in the blue wavelength band reflected by the second reflecting mirror 145 passes through the second dichroic mirror 148 via the condenser lens 147, and is incident on the condenser lens 173. Therefore, the light beams of the light of each wavelength band of red, green, and blue guided by the light guide optical system 140 are guided to the same optical path of the light source optical system 170.

The light source optical system 170 includes a condenser lens 173, a light tunnel 175, a condenser lens 178, an optical axis conversion mirror 179, a condenser lens 183, an irradiation mirror 185, and a condenser lens 195(condenser lenses). The condenser 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 condenser lens 195 toward the projection optical system 220.

Each light flux emitted from the condenser lens 173 is incident on the light tunnel 175. Each light beam incident to the light tunnel 175 becomes a light beam of uniform intensity distribution through the light tunnel 175.

An optical axis conversion mirror 179 is disposed on the optical axis of the light tunnel 175 on the back panel 13 side via a condenser lens 178. The light flux emitted from the exit of the light tunnel 175 is condensed by the condenser lens 178 and then converted to the optical axis of the condenser lens 183 by the optical axis conversion mirror 179.

The light beam reflected by the optical axis switching mirror 179 is condensed by the condenser lens 183, and then irradiated onto the display element 51 at a predetermined angle through the condenser lens 195 by the irradiation mirror 185. In addition, a heat sink 190 is provided on the rear panel 13 side of the display element 51. The display element 51 as a DMD is cooled by the heat sink 190.

Then, a light flux as light source light irradiated on the image forming surface of the display element 51 by the light source optical system 170 is reflected by the image forming surface of the display element 51, and is projected as projection light onto a screen via the projection optical system 220.

The projection optical system 220 includes a condenser 195, a movable lens group 235, and a fixed lens group 225. The fixed lens group 225 is built in the fixed barrel. The movable lens group 235 is built in the movable lens barrel, and zooming adjustment and focusing adjustment are achieved by manual or automatic movement.

By configuring the projection apparatus 10 in this manner, the optical wheel 101 is rotated, and if light is emitted from the excitation-light irradiation device 70 and the red-light source device 120 at different timings, light of each wavelength band of red, green, and blue is incident on the light tunnel 175 via the light guide optical system 140, and further incident on the display element 51 via the light source optical system 170. Therefore, the DMD, which is the display element 51 of the projector 10, can display the respective color lights in a time-division manner based on the data, thereby projecting a color image on the screen.

Next, the wheel cover 500 is described in detail based on fig. 4 to 7. Fig. 4 and 5 are exploded perspective views of the wheel cover 500, which are enlarged perspective views of a part of the optical wheel apparatus 100 and the optical housing 61. Here, in the optical wheel device 100 shown in fig. 4 and 5, a substrate 103 having a control circuit mounted above the in-wheel motor 110 to control the in-wheel motor 110 in rotation is shown together with the optical wheel 101 and the in-wheel motor 110. Fig. 4 is a perspective view from the optical wheel 101 side, and fig. 5 is a perspective view from the in-wheel motor 110 side. Fig. 6 and 7 are cross-sectional views vi-vi and vii-vii of fig. 2 in a state where the wheel cover 500 is attached to the optical housing 61.

The wheel cover 500 has an inner cover 510 (lid 1) and an outer cover 520 (lid 2). The outer cap 520 is formed outside the inner cap 510 with a predetermined space from the inner cap 510.

The inner lid 510 is formed in a substantially rectangular box shape, and has a convex arc shape with its top surface facing outward in a side view (a vertical cross section). Inner cover 510 has an inner cover front plate 511 (1 st front plate) standing on the optical wheel 101 side and an inner cover rear plate 512 (1 st rear plate) standing on the in-wheel motor 110 side. A plurality of through holes 511a are formed in the inner lid front plate 511. In the present embodiment, as shown in fig. 4, the plurality of through holes 511a are arranged in a bird-like shape in 3 stages, 3 through holes 511a are formed in the upper stage and the lower stage in the lateral direction, respectively, and 4 through holes 511a are formed in the middle stage in the lateral direction.

The inner lid rear plate 512 (1 st rear plate) of the inner lid 510 is formed with a long hole 512a that is long in the lateral direction slightly below the inner lid rear plate 512. Here, the total area of the plurality of through holes 511a is substantially the same as the area of the long hole 512 a. An inner lid upper plate 513 (1 st upper plate) connecting upper ends of the inner lid front plate 511 and the inner lid rear plate 512 is formed on the inner lid 510. The inner lid upper plate 513 is formed in a convex arc shape facing outward in side view (vertical cross section). Further, both left and right ends of the inner lid front plate 511 and both left and right ends of the inner lid rear plate 512 are connected by 2 inner lid side plates 514 (1 st side plate), respectively. The upper end of the inner lid side plate 514 is connected to the left and right ends of the inner lid upper plate 513. A flange 515 is formed on the periphery of the lower opening edge of the inner lid 510 to be attached to the optical housing 61.

On the other hand, outer lid 520 has a substantially rectangular box shape having an outer shape substantially similar to that of inner lid 510, and has a top surface formed in a convex arc shape in side view (vertical sectional view) similarly to inner lid 510. The outer lid 520 has: an outer cover front plate 521 (2 nd front plate) opposed to the inner cover front plate 511 of the inner cover 510 with a predetermined space; and an outer lid rear plate 522 (No. 2 rear plate) which is opposed to the inner lid rear plate 512 with a predetermined gap therebetween. Further, an outer lid upper plate 523 is formed on the outer lid 520 to face the inner lid upper plate 513 of the inner lid 510 with a predetermined gap therebetween, and to connect upper ends of the outer lid front plate 521 and the outer lid rear plate 522. The outer lid upper plate 523 (2 nd upper plate) is formed in a convex arc shape facing outward in side view (vertical cross section).

Further, the outer cover 520 is formed with 2 outer cover side plates 524 (2 nd side plate) which are adjacent to and face the inner cover side plates 514 of the inner cover 510, and which connect both right and left ends of the outer cover front plate 521 and the outer cover rear plate 522 and have upper ends connected to the outer cover upper plate 523. A flange 525 to be attached to the optical housing 61 is formed on the periphery of the lower opening edge of the outer cover 520.

As shown in fig. 6 and 7, the inner lid 510 and the outer lid 520 are mounted on the optical housing 61 by collectively tightening the flange portions 515 and 525 with bolts 503 via a rubber plate 501. At this time, a predetermined interval is formed between the outer surfaces of the inner lid front plate 511, the inner lid rear plate 512, and the inner lid upper plate 513 of the inner lid 510 and the inner surfaces of the outer lid front plate 521, the outer lid rear plate 522, and the outer lid upper plate 523 of the outer lid 520. As shown in fig. 7, the gap between the outer surface of the inner lid side plate 514 of the inner lid 510 and the inner surface of the outer lid side plate 524 of the outer lid 520 is set to a small gap in which the outer lid 520 can cover the inner lid 510.

The interior of the shroud 500 is formed so that the principle of a Helmholtz (Helmholtz) absorber can be applied. The sound source of the sound to be absorbed is the rotational sound of the optical wheel 101. The sound generated by the sound source enters the plurality of through holes 511a from the optical wheel 101 inside the inner lid 510, and vibrates the air inside the plurality of through holes 511 a. At this time, with respect to the wheel cover 500, the following expression is established for a Helmholtz (Helmholtz) absorber. Here, as described above, since the outer surface of the inner lid side plate 514 and the inner surface of the outer lid side plate 524 of the outer lid 520 are close to each other, the hole rear space (V) is formed by a predetermined space between the outer surfaces of the inner lid front plate 511, the inner lid rear plate 512, and the inner lid upper plate 513 and the inner surfaces of the outer lid front plate 521, the outer lid rear plate 522, and the outer lid upper plate 523 of the outer lid 520.

[ equation 1]

f₀: resonant frequency [ Hz]

c: speed of sound [ m/s ]

S: cross-sectional area of hole [ m ]²](Total area of the plurality of through holes 511 a)

V: volume of pore rear space [ m ]³]

L hole depth m (thickness of inner lid front plate 511 of inner lid 510)

Therefore, when the projection apparatus 10 (the light source apparatus 60) is driven and the optical wheel apparatus 100 is driven, the optical wheel 101 is rotated by the in-wheel motor 110 to generate a rotation sound (wind noise) of the optical wheel 101. The rotational sound is absorbed by the air vibration in the thickness of the plurality of through holes 511 a. In order to absorb the rotational sound in the sound range around 2000Hz which can be maximally heard by a human, the cross-sectional area (S) of the hole and the volume (V) of the space behind the hole may be appropriately adjusted.

Further, the air vibration in the plate thickness of the plurality of through holes 511a generates a flow of air in a predetermined space (hole rear portion space) between the inner lid 510 and the outer lid 520. That is, the air around the through-hole 511a is pushed out by the continuous vibration of the air in the thickness of the plurality of through-holes 511 a. Then, as indicated by hollow arrows in fig. 6, the air that has exited from the plurality of through holes 511a flows from between the inner lid front plate 511 and the outer lid front plate 521, through between the inner lid upper plate 513 and the outer lid upper plate 523, to between the inner lid rear plate 512 and the outer lid rear plate 522, and flows into the inner lid 510 from the elongated hole 512a, so as to follow the inner surface of the outer lid 520 and the outer surface of the inner lid 510.

Therefore, the air in the inner cover 510 is discharged from the plurality of through holes 511a of the inner cover 510, and flows into the long holes 512a, whereby the optical wheel 101 and the in-wheel motor 110, which are heat generating portions, can be cooled. That is, the air having cooled the optical wheel 101 and the like in the inner cover 510 flows through the space between the inner cover 510 and the outer cover 520 to be cooled, and flows into the inner cover 510 through the long hole 512a again to cool the optical wheel 101 and the like.

Here, as described above, since the total area of the plurality of through holes 511a is the same as the area of the long hole 512a, the amounts of the air pushed out from the plurality of through holes 511a and the air flowing in from the long hole 512a can be substantially equalized, and the air flow can be generated efficiently. Further, since inner cover upper plate 513 and outer cover upper plate 523 are formed by bending, air flow can be smoothly caused from the optical wheel 101 side to the in-wheel motor 110 side. Further, since the air flow is generated in the flow path ranging from the inner lid front plate 511 to the inner lid upper plate 513 and the inner lid rear plate 512 by substantially eliminating the gap between the inner lid side plate 514 and the outer lid side plate 524, the air flow can be smoothly performed without disturbance.

Fig. 8 shows a wheel cover 500A as a modification of the wheel cover 500. The wheel cover 500A is a member in which an inner cover 510A (1 st cover) and an outer cover 520A (2 nd cover) are formed in a hemispherical shape, respectively. On the optical wheel 101 side of the inner cover 510A, a plurality of through holes 510Aa are arranged in 2 rows laterally, 7 in the upper row, and 5 in the lower row. Long holes 510Ab for exhaust gas, which are laterally long, are provided below the plurality of through holes 510 Aa. A long hole 510Ac for air intake, which is long in the lateral direction, is formed on the in-wheel motor 110 side of the inner lid 510A. The long holes 510Ab and 510Ac for exhaust and intake have substantially the same area.

In the wheel cover 500A of the present configuration, an air flow is also generated inside the wheel cover 500A. In the wheel cover 500A, an air flow is generated along the entire area of the outer surface of the hemispherical inner cover 510A and the entire area of the inner surface of the same hemispherical outer cover 520A. Therefore, the air flow may be disturbed around the long hole 510Ac for air intake of the inner cover 510A.

In the case of the substantially box-shaped wheel cover 500 and the hemispherical wheel cover 500A, a temperature measurement test was performed for confirming the cooling effect of the wheel covers 500 and 500A by attaching a thermocouple to the rear surface of the in-wheel motor 110, in the structure of the above-described embodiment (hereinafter referred to as "hole") and the structure of the through holes 511a and 510Aa and the inner cover 510A for air suction and exhaust with adhesive tapes from the inner surfaces of the inner covers 510 and 510A (hereinafter referred to as "hole-free"). The inner volumes of the wheel covers 500 and 500A are formed in the same manner. Further, regarding the material, the inner covers 510, 510A are formed of aluminum, and the outer covers 520, 520A are formed of a resin material (polycarbonate).

The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments and can be implemented with appropriate modifications. For example, the shape of the wheel cover (inner cover, outer cover) may be appropriately changed, not only in a substantially box-like shape or a hemispherical shape. However, in view of the cooling effect, the substantially box-shaped wheel cover 500 is suitable from the results of the above tests. The material of the wheel cover (inner cover, outer cover) may be a metal material or a resin material. The wheel covers 500 and 500A are not limited to the optical wheel device 100 having the optical wheel 101 on which the fluorescent material is laid, and may be applied to an optical wheel device such as a color wheel.

As described above, according to the embodiment of the present invention, the optical wheel device 100 includes the in-wheel motor 110, the optical wheel 101 rotated by the in-wheel motor 110, and the wheel covers 500 and 500A covering a part of the optical wheel 101, and the wheel covers 500 and 500A include the inner covers 510 and 510A having the plurality of through holes formed therein, and the outer covers 520 and 520A disposed outside the inner covers 510 and 510A with a predetermined space from the inner covers 510 and 510A.

This causes air to flow in the wheel covers 500 and 500A, and air can circulate between the inside of the inner covers 510 and 510A and between the inner covers 510 and 510A and the outer covers 520 and 520A. Therefore, the cooling efficiency of the optical wheel 101 can be improved. Further, the silencing efficiency can be improved by the structure of the Helmholtz (Helmholtz) sound absorber.

Further, a plurality of through holes 511a and 510Aa are formed on the optical wheel 101 side. Therefore, the rotational sound of the optical wheel 101 as a sound source can be directly transmitted to the plurality of through holes 511a and 510Aa, and the air flow in the wheel covers 500 and 500A can be increased because the air vibration in the plurality of through holes 511a and 510Aa is also large.

Further, long holes 512a, 510Ac are formed on the in-wheel motor 110 side of the inner covers 510, 510A. This allows air pushed out from the optical wheel 101 side of the inner covers 510 and 510A to flow into the inner covers 510 and 510A through the elongated holes 512a and 510 Ac.

The inner lid 510 is provided with a plurality of through holes 511a having the same area as the long holes 512 a. Thus, the amount of air pushed out from the inside of the inner lid 510 through the plurality of through holes 511a is substantially the same as the amount of air flowing in from the long holes 512a, and the air flow can be smoothly performed.

Further, the inner lid 510 is formed of an inner lid front plate 511, an inner lid rear plate 512, an inner lid upper plate 513 in a convex circular arc shape, and 2 inner lid side plates 514. Accordingly, the inner cover front plate 511 can be erected substantially parallel to the optical wheel 101, and a plurality of through holes 511a can be provided, so that the suction of the sound from the optical wheel 101 can be performed efficiently. Then, the air flow from the outer surface of the inner lid front plate 511 to the inner lid rear plate 512 can be smoothly performed along the convex arc-shaped inner lid upper plate 513.

The outer lid 520 is formed of an outer lid front plate 521, an outer lid rear plate 522, an outer lid upper plate having a convex circular arc shape, and 2 outer lid side plates 524, which face the inner lid front plate 511, the inner lid rear plate 512, and the inner lid upper plate 513 of the inner lid 510 with a predetermined gap therebetween. Accordingly, the air smoothly flows along the inner surfaces of the cover front plate 521, the cover rear plate 522, and the convex arc-shaped cover upper plate of the cover 520, and the cooling efficiency can be improved.

Further, the inner lid 510A and the outer lid 520A are formed in a hemispherical shape, respectively. This enables formation of the hemispherical wheel cover 500A that achieves air flow and noise reduction.

The light source device 60 includes an optical wheel device 100 and an excitation light irradiation device 70, the optical wheel device 100 includes an optical wheel 101 having wheel covers 500 and 500A and provided with a luminescent light emitting region, and the excitation light irradiation device 70 includes a plurality of blue laser diodes 71 as semiconductor elements that emit light of a blue wavelength band different from light of a green wavelength band emitted from the optical wheel device 100. This can provide the light source device 60 that can improve the cooling efficiency of the optical wheel device 100 and can also realize noise reduction.

The projection apparatus 10 includes a light source device 60, a display element 51, a projection optical system 220, and a projection apparatus control unit. This can provide the projection apparatus 10 which can improve the cooling efficiency of the optical wheel apparatus 100 and can also realize noise reduction.

In the embodiments described above, the example of the optical wheel 101 including the in-wheel motor 110 and the fluorescent light emitting region that emits fluorescent light of a green wavelength band different from the blue wavelength band light (1 st wavelength band light) and the red wavelength band light (2 nd wavelength band light) and that is rotated by the in-wheel motor 110 as the heat generating portion is shown, but the present invention is not limited to this configuration. For example, the heat generating portion may be another light source such as the blue laser diode 17 as a semiconductor light emitting element, or the red light source 121 (red light emitting diode) as a semiconductor light emitting element. Alternatively, the light source such as the blue laser diode 71 or the red light source 121 may be a heat sink, or a heat sink such as a fan.

The height of the lower end of the inner lid 510, 510A (1 st lid) from the center of the opening of the plurality of through holes 511a, 510Aa (1 st opening) is higher than the height of the lower end of the inner lid 510, 510A (1 st lid) from the center of the opening of the elongated hole 512a (2 nd opening). Therefore, the gas in the region of relatively high temperature inside the 1 st cover is efficiently discharged to the outside of the inner covers 510 and 510A (1 st cover), and the discharged gas flows into the intake holes through the flow paths between the inner covers 510 and 510A (1 st cover) and the outer covers 520 and 520A (2 nd cover), so that the heat generating portions can be efficiently cooled.

The total cross-sectional area of the plurality of through holes 511a and 510Aa (1 st opening) formed in the inner covers 510 and 510A (1 st cover) on the optical wheel 101 side is equal to or larger than the cross-sectional area of the long holes 512a and 510Ac (2 nd opening) formed in the inner covers 510 and 510A (1 st cover) on the in-wheel motor 110 side. Therefore, the heat inside the 1 st lid is discharged from the 1 st opening to the outside of the 1 st lid, passes through the flow path between the 1 st lid and the 2 nd lid, and is circulated by being guided to the 2 nd opening, so that the cooling can be performed efficiently.

The cross-sectional area of the flow path between the inner lid 510, 510A (1 st lid) and the outer lid 520, 520A (2 nd lid) is equal to or larger than the cross-sectional area of the through hole 511a, 510Aa (1 st opening). Therefore, since the flow path resistance can be reduced, the gas can be circulated efficiently.

The total cross-sectional area of the plurality of through holes 511a and 510Aa (1 st opening), the cross-sectional area of the elongated holes 512a and 510Ac (2 nd opening), and the cross-sectional area of the flow channel are preferably substantially the same. With such a configuration, it is possible to solve the problem that the flow of the gas generated is stagnated and stagnates due to an excessively large cross-sectional area of the flow path with respect to the cross-sectional area of the 1 st opening, and the problem that the flow path resistance is increased due to an excessively small cross-sectional area of the flow path with respect to the cross-sectional area of the 1 st opening.

Further, the outer lid side plate 524 (2 nd side plate) and the inner lid side plate 514 (1 st side plate) may be close to each other without a predetermined space therebetween. The outer lid side plate 524 (2 nd side plate) and the inner lid side plate 514 (1 st side plate) may be disposed in close contact with each other. With such a configuration, since no gas flows between the outer lid side plate 524 (2 nd side plate) and the inner lid side plate 514 (1 st side plate), more gas flows into the space between the inner lid upper plate 513 (1 st upper plate) and the outer lid upper plate 523 (2 nd upper plate), and thus the cooling efficiency can be improved.

The embodiments described above are provided as examples and do not limit the scope of the present invention. These new embodiments may be implemented in other various ways, and various omissions, substitutions, and changes may 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.