Projector

Abstract

To provide a projector that can prevent a reduction in image quality due to shaking of a projection image.SOLUTION: A projector of the present invention comprises: an exterior housing that forms an exterior; a metal base that is fixed to an inner surface of the exterior housing; a light source device that is fixed to the base; an image forming device that is fixed to the base and modulates light from the light source device into image light; a projection optical device that is fixed to the base and projects the image light; a cooling unit that is fixed to the base and drives to generate vibration; a first support part that is erected from the base; and a first beam member that connects and fixes the first support part and a side of the cooling unit opposite to the base to each other.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a projector.

Background Art

[0002] In recent years, with the improvement of the image quality of projectors and the increase in the screen size such as projection mapping, projectors with high brightness have been demanded. For this reason, in a projector, since heat sources such as an image forming device including a panel, a light source device, or a power supply device have a higher temperature, it is necessary to improve the performance of the cooling device. For example, in the projector disclosed in Patent Document 1 below, a liquid crystal panel constituting an image forming unit is cooled by liquid cooling.

[0003] On the other hand, fans and pumps of the cooling device generate vibrations during driving. When the vibrations resonate with the natural frequency of the projector, the vibrations are transmitted to the projection lens, causing the projection image to shake and leading to a deterioration in image quality. For example, in the projector disclosed in Patent Document 2 below, the deterioration of the image quality is suppressed by making it difficult for the vibrations to be transmitted to the projection lens by giving a difference in the frequencies of the vibrations of a plurality of fans.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, even in the projector disclosed in Patent Document 2 below, it has been difficult to sufficiently suppress the shaking of the projection lens due to the layout constraints of each member arranged in the projector.

Means for Solving the Problems

[0006] In order to solve the above problem, according to one aspect of the present invention, there is provided a projector comprising an exterior housing that forms the exterior, a metal base fixed to the inner surface of the exterior housing, a light source device fixed to the base, an image forming device fixed to the base and modulating light from the light source device into image light, a projection optical device fixed to the base and projecting the image light, a cooling unit fixed to the base and generating vibrations when driven, a first support part standing from the base, and a first beam member that connects and fixes the first support part to the opposite side of the base on the cooling unit. [Brief explanation of the drawings]

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings below, the dimensions of the components may be shown on different scales to make them easier to see.

[0009] (First Embodiment) FIG. 1 is a plan view showing the configuration of the projector according to this embodiment. The projector 1 according to this embodiment modulates the illumination light emitted from the light source device 2 to generate image light corresponding to image information, and enlarges and projects the formed image light onto a projection surface such as a screen. As shown in FIG. 1, the projector 1 includes a light source device 2, an image forming device 3, a projection optical device 4, an exterior housing 5, a base 15, a cooling device 6, and a power supply device 14.

[0010] In the following description, an XYZ orthogonal coordinate system is used as necessary. In each drawing, the X-axis is an axis along the optical axis AX1 of the illumination light WL emitted from the light source device 2 toward the image forming device 3. The Y-axis is orthogonal to the X-axis and is the direction in which the projection optical device 4 projects the image light, that is, an axis along the optical axis AX2 of the projection optical device 4. The Z-axis is an axis orthogonal to the optical axis AX1 and the optical axis AX2. Also, in this embodiment, the direction along the Z-axis is referred to as the "vertical direction Z", +Z is referred to as the "upper side", -Z is referred to as the "lower side", the direction along the X-axis is referred to as the "left-right direction X", +X is referred to as the "right side", -X is referred to as the "left side", and the direction along the Y-axis is referred to as the "front-back direction Y", +Y is referred to as the "front side", and -Y is referred to as the "rear side" for explanation. Note that the vertical direction Z, the left-right direction X, and the front-back direction Y are merely names for explaining the arrangement relationship of the respective components of the projector 1, and do not define the actual installation posture or direction of the projector 1.

[0011] The light source device 2 supplies white illumination light WL to the image forming unit 3A of the image forming device 3. The light source device 2 is connected to a first connection portion 10a provided in the case 10.

[0012] The first connection portion 10a is formed of, for example, a window portion having translucency. Note that the first connection portion 10a may be an opening formed in the case 10 as long as it can seal the inside of the case 10 when the light source device 2 is connected. Based on such a configuration, the image forming apparatus 3 of the present embodiment can cause illumination light WL from the light source device 2 to enter each of the light modulation panels 32R, 32G, and 32B via the first connection portion 10a of the case 10.

[0013] The image forming apparatus 3 is configured by accommodating at least the image forming unit 3A, the heat exchanger 7 for panel heat absorption, and the panel fan 16 in a sealed state within a case 10 having a sealed structure. The case 10 accommodates the image forming unit 3A, the heat exchanger 7 for panel heat absorption, and the panel fan 16 while holding them in predetermined positions. The image forming apparatus 3 is configured by arranging and accommodating the image forming unit 3A, the heat exchanger 7 for panel heat absorption, and the panel fan 16 in this order within the case 10 from the front side (+Y side) toward the rear side (-Y side).

[0014] The heat exchanger 7 for panel heat absorption is disposed in the case 10 of the image forming apparatus 3 so as to partition the accommodation space, which is the accommodation portion of the image forming unit 3A, from the accommodation space, which is the accommodation portion of the panel fan 16. In the case of the present embodiment, the heat exchanger 7 for panel heat absorption is disposed along the left - right direction so as to divide the space within the case 10 into two in the front - rear direction Y along the optical axis AX2.

[0015] Within the case 10 of the image forming apparatus 3, the image forming unit 3A, the heat exchanger 7 for panel heat absorption, and the panel fan 16 are arranged in the front - rear direction Y, and the heat exchanger 8 for panel heat dissipation extends along the front - rear direction Y.

[0016] The image forming unit 3A includes the light modulation panels 32R, 32G, and 32B and the cross - dichroic prism 34. Each of the light modulation panels 32R, 32G, and 32B modulates the incident color light according to image information to form image light. Each of the light modulation panels 32R, 32G, and 32B is configured by a light - transmissive liquid crystal panel.

[0017] The light modulation panel 32R is a liquid crystal panel for red corresponding to red light LR, the light modulation panel 32G is a liquid crystal panel for green corresponding to green light LG, and the light modulation panel 32B is a liquid crystal panel for blue corresponding to blue light LB.

[0018] The cross-dichroic prism 34 combines the respective image lights emitted from each of the light modulation panels 32R, 32G, and 32B. The cross-dichroic prism 34 has a substantially square shape in plan view formed by bonding four right-angled prisms, and a dielectric multilayer film is provided on a substantially X-shaped interface where the right-angled prisms are bonded to each other. Based on such a configuration, the image forming unit 3A of the present embodiment generates full-color image light by combining the image lights of each color.

[0019] In the present embodiment, field lenses 33R, 33G, and 33B are provided on the light incident sides of the light modulation panels 32R, 32G, and 32B, respectively. Although not shown, incident-side polarizing plates are arranged between each of the light modulation panels 32R, 32G, and 32B and each of the field lenses 33R, 33G, and 33B, and emission-side polarizing plates are arranged between each of the light modulation panels 32R, 32G, and 32B and the cross-dichroic prism 34.

[0020] In the present embodiment, the image forming apparatus 3 further includes a uniform illumination optical system 30 and a color separation light guide optical system 31 housed in the case 10. The case 10 houses the uniform illumination optical system 30 and the color separation light guide optical system 31 while holding them in predetermined positions.

[0021] The illumination light WL emitted from the light source device 2 enters the uniform illumination optical system 30. The uniform illumination optical system 30 includes a first lens array 301, a second lens array 302, a polarization conversion element 303, and a superposition lens 304.

[0022] The first lens array 301 includes a plurality of first small lenses for dividing the illumination light WL from the light source device 2 into a plurality of partial light beams. The plurality of first small lenses are arranged in a matrix in a plane orthogonal to the optical axis AX1 of the illumination light WL.

[0023] The second lens array 302 includes a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array 301. The plurality of second small lenses are arranged in a matrix in a plane orthogonal to the optical axis AX1.

[0024] The second lens array 302, together with the superimposing lens 304, forms an image of each first small lens of the first lens array 301 in the vicinity of the image formation regions of the light modulation panels 32R, 32G, and 32B, respectively.

[0025] The polarization conversion element 303 converts the light emitted from the second lens array 302 into linearly polarized light in one direction. The polarization conversion element 303 has, for example, a polarization separation film and a retardation plate (not shown).

[0026] The superimposing lens 304 condenses each partial light beam emitted from the polarization conversion element 303 and superimposes them in the vicinity of the image formation regions of the light modulation panels 32R, 32G, and 32B, respectively.

[0027] The color separation light guiding optical system 31 separates the illumination light WL passing through the uniform illumination optical system 30 into red light LR, green light LG, and blue light LB, and guides them to the respective light modulation panels 32R, 32G, and 32B. The color separation light guiding optical system 31 includes a first dichroic mirror 311, a second dichroic mirror 312, a first reflection mirror 313, a second reflection mirror 314, a third reflection mirror 315, a first relay lens 316, and a second relay lens 317.

[0028] The first dichroic mirror 311 reflects the red light LR and transmits the green light LG and the blue light LB. The second dichroic mirror 312 reflects the green light LG out of the green light LG and the blue light LB transmitted through the first dichroic mirror 311 and transmits the blue light LB. The first reflection mirror 313 reflects the red light LR. The second reflection mirror 314 and the third reflection mirror 315 reflect the blue light LB. The first relay lens 316 is disposed between the second dichroic mirror 312 and the second reflection mirror 314, and the second relay lens 317 is disposed between the second reflection mirror 314 and the third reflection mirror 315.

[0029] The projection optical device 4 is connected to the second connection portion 10b provided in the case 10. The projection optical device 4 is composed of a projection lens group, and light from each of the light modulation panels 32R, 32G, and 32B of the image forming unit 3A is incident through the second connection portion 10b of the case 10.

[0030] The second connection portion 10b is constituted by, for example, a window portion having translucency. Note that the second connection portion 10b may be an opening formed in the case 10 as long as the inside of the case 10 can be sealed when the projection optical device 4 is connected. Further, the second connection portion 10b may include a lens shift mechanism that shifts the optical axis AX2 of the projection optical device 4.

[0031] Based on such a configuration, the image forming apparatus 3 of the present embodiment can expand and project the image light generated by the image forming apparatus 3 toward a projection surface such as a screen through the second connection portion 10b of the case 10. As a result, an enlarged color image is displayed on the screen.

[0032] The exterior housing 5 houses the light source device 2, the image forming device 3, the cooling device 6, and the power supply device 14 therein and constitutes the exterior of the projector 1. The exterior housing 5 includes a front surface portion 51, a rear surface portion 52, a left side surface portion 53, a right side surface portion 54, a top surface portion 55, and a bottom surface portion 56. The exterior housing 5 is formed in, for example, a substantially rectangular parallelepiped shape. In FIG. 1, the top surface portion 55 is illustrated as a transparent member in order to show the internal structure of the exterior housing 5.

[0033] The front surface portion 51 is located on the front side (+Y) in the front-rear direction Y and is a plate-like portion along the XZ plane. The rear surface portion 52 is located on the rear side (-Y) in the front-rear direction Y and is a plate-like portion along the XZ plane. The left side surface portion 53 is located on the left side (-X) in the left-right direction X and is a plate-like portion along the YZ plane. The right side surface portion 54 is located on the right side (+X) in the left-right direction X and is a plate-like portion along the YZ plane. Top surface portion 55 is a plate-like portion that connects the upper (+Z) ends of front surface portion 51, rear surface portion 52, left side surface portion 53, and right side surface portion 54 together and extends along the XY plane. The bottom surface portion 56 is a plate-like portion that connects the lower (-Z) ends of the front surface portion 51, rear surface portion 52, left side surface portion 53, and right side surface portion 54 together and extends along the XY plane.

[0034] The front surface 51 has an opening 51a provided in approximately the center. The projection optical device 4 is inserted into the exterior housing 5 through the opening 51a and connected to the image forming device 3. In the present embodiment, the front end of the projection optical device 4 protrudes outside the exterior housing 5 through the opening 51a, but the front end of the projection optical device 4 may be located inside the exterior housing 5 with respect to the opening 51a.

[0035] 2 is an exploded perspective view showing the main configuration of the projector of this embodiment. In order to make the drawing easier to see, only the bottom plate portion of the exterior housing 5 is shown in FIG. 2, and other portions are omitted from the drawing.

[0036] 1 and 2, the base 15 is fixed to the bottom surface 56, which is the inner surface of the exterior housing 5. The base 15 is made of a metal sheet and has a predetermined rigidity. As shown in FIG. 2, the base 15 fixes the light source device 2, the image forming device 3, a cooling unit 60 which is part of the cooling device 6, and the power supply device 14.

[0037] The base 15 has a first surface 15a on one side and a second surface 15b on the other side opposite to the first side. The base 15 fixes the image forming apparatus 3 at the center in the left - right direction X on the first surface 15a, and fixes the cooling unit 60 on the right side (+X) of the image forming apparatus 3 on the first surface 15a. Also, the base 15 fixes the light source device 2 on the first surface 15a on the left side (-X) of the image forming apparatus 3, and fixes the power supply device 14 on the second surface 15b. The power supply device 14 is arranged on the lower side (-Z) of the light source device 2. As shown in FIG. 1, the power supply device 14 is arranged on the right side (+X) with respect to the case 10 of the image forming apparatus 3 within the outer housing 5. The power supply device 14 is arranged within the outer housing 5 so as to overlap at least a part of the light source device 2 in the vertical direction Z intersecting the front - rear direction Y and the left - right direction X along the optical axis AX2.

[0038] The front portion 51 of the outer housing 5 includes an air intake port 51c. The air intake port 51c is provided at a position facing the power supply device 14. The power supply device 14 supplies power to the light source device 2 and the image forming unit 3A. As shown in FIG. 1, the power supply device 14 includes a power supply fan 14a for cooling the electronic components provided on the power supply board. For this reason, the power supply fan 14a can efficiently cool the electronic components by efficiently taking in the air flow K inside through the air intake port 51c. Since the power supply device 14 is fixed to the metal base 15, it is possible to suppress the shaking of the projected image due to the vibration of the power supply fan 14a being transmitted to the projection optical device 4.

[0039] The light source device 2 of the present embodiment generates illumination light WL including fluorescence obtained by wavelength - converting the excitation light emitted from the solid - state light source with a wavelength - conversion element. As shown in FIG. 2, the light source device 2 includes a light - source fan 20 for cooling the wavelength - conversion element. Since the light source device 2 of the present embodiment is fixed to the metal base 15, it is possible to suppress the shaking of the projected image due to the vibration of the light - source fan 20 being transmitted to the projection optical device 4.

[0040] In the projector 1 of the present embodiment, in the exterior housing 5, the power supply device 14 and the light source device 2 are arranged so as to overlap in the vertical direction Z. Therefore, compared with the layout in which the power supply device 14 and the light source device 2 are arranged side by side in the left - right direction X or the front - rear direction Y, the size of the exterior housing 5 when viewed from the vertical direction Z in plan view can be reduced. That is, according to the layout of the present embodiment, the footprint of the projector 1 can be reduced.

[0041] As shown in FIG. 2, the projector 1 of the present embodiment has legs 18 provided on the bottom surface of the exterior housing 5. The legs 18 are in contact with the installation surface M of the projector 1. The legs 18 are fixed to the base 15. According to this configuration, since the legs 18 are fixed to the base 15, the vibration of the projector 1 itself can be efficiently suppressed.

[0042] As shown in FIG. 1, in the projector 1 of the present embodiment, a plurality of heat - generating sources are arranged in the exterior housing 5. For example, the first heat - generating source is the light modulation panels 32R, 32G, 32B in the image forming device 3, and the second heat - generating source is the light source device 2. The projector 1 of the present embodiment includes a cooling device 6 for cooling the heat generated by the above - mentioned heat - generating sources.

[0043] The cooling device 6 of the present embodiment includes a light - source heat - absorbing heat exchanger 25 that absorbs the heat generated by the light source device 2, a panel heat - absorbing heat exchanger 7 that absorbs the heat generated by the light modulation panels 32R, 32G, 32B, a light - source heat - radiating heat exchanger 9 that radiates the heat transmitted from the light - source heat - absorbing heat exchanger 25, a panel heat - radiating heat exchanger 8 that radiates the heat transmitted from the panel heat - absorbing heat exchanger 7, a panel fan 16, a heat - exchanger fan 17 that sends an air flow to the panel heat - radiating heat exchanger 8 and the light - source heat - radiating heat exchanger 9, and an exhaust - heat fan 13. As the panel fan 16, the heat - exchanger fan 17, and the exhaust - heat fan 13, for example, a centrifugal fan or a sirocco fan can be used, but the type of the fan is not limited to this.

[0044] In the projector 1 of this embodiment, the heat-generating light modulation panels 32R, 32G, and 32B are cooled by sending an airflow using the panel fans 16. In this embodiment, a plurality of panel fans 16 are provided inside the case 10. The plurality of panel fans 16 includes three fans 16a, 16b, and 16c. The fan 16a sends an airflow to the light modulation panel 32R, the fan 16b sends an airflow to the light modulation panel 32G, and the fan 16c sends an airflow to the light modulation panel 32B.

[0045] The fans 16a, 16b, and 16c constituting the panel fan 16 are arranged in multiple rows in the left-right direction X along the panel heat absorption heat exchanger 7. The airflow of each of the fans 16a, 16b, and 16c flows to the light modulation panels 32R, 32G, and 32B of the image forming unit 3A via the panel heat absorption heat exchanger 7 and ducts (not shown) provided between the image forming unit 3A and the exterior housing 5.

[0046] In this embodiment, the fans 16a, 16b, and 16c are disposed on the rear side (-Y) of the panel heat absorption heat exchanger 7. Therefore, the airflow heated by cooling the light modulation panels 32R, 32G, and 32B passes through the panel heat absorption heat exchanger 7 and is again drawn into the fans 16a, 16b, and 16c. The panel heat absorption heat exchanger 7 absorbs heat from the airflow heated by the light modulation panels 32R, 32G, and 32B.

[0047] The panel heat absorption heat exchanger 7 is composed of a radiator. The panel heat absorption heat exchanger 7 is a heat exchanger that absorbs heat from the airflow by exchanging heat between the heat exchange liquid flowing inside and the airflow. The heat exchange liquid flowing inside the radiator is heated by absorbing heat from the airflow and is then supplied to the panel heat dissipation heat exchanger 8 via a cooling flow path (not shown).

[0048] The panel heat dissipation heat exchanger 8 dissipates heat from the heat exchange liquid supplied from the panel heat absorption heat exchanger 7. The panel heat dissipation heat exchanger 8 is a heat exchanger that dissipates heat from the heat exchange liquid by exchanging heat with the air flow K through the heat exchange liquid flowing into the interior thereof. The heat exchange liquid cooled by the panel heat dissipation heat exchanger 8 is supplied again to the panel heat absorption heat exchanger 7 through the cooling flow path and is used for heat exchange with the air flow heated by the light modulation panels 32R, 32G, and 32B. The panel heat dissipation heat exchanger 8 is disposed on the left side (-X), which is the other side in the left-right direction X, with respect to the image forming apparatus 3 within the exterior housing 5. The panel heat dissipation heat exchanger 8 extends along the front-rear direction Y.

[0049] Thus, according to the image forming apparatus 3 of the present embodiment, when the air flow K is circulated to the light modulation panels 32R, 32G, and 32B housed within the sealed space, the temperature of the air flow is decreased through the panel heat absorption heat exchanger 7, whereby the light modulation panels 32R, 32G, and 32B can be efficiently cooled. Further, the image forming apparatus 3 of the present embodiment can suppress the occurrence of problems such as a deterioration in display quality due to the adhesion of dust, foreign matter, or the like by housing the light modulation panels 32R, 32G, and 32B within the sealed space.

[0050] In the projector 1 of the present embodiment, the light source device 2 includes, for example, a solid light source that emits blue laser light, which is excitation light, and a wavelength conversion element that converts at least a part of the blue light emitted from the solid light source into fluorescence including green light and red light. The solid light source that emits laser light becomes hot. Therefore, in the light source device 2 of the present embodiment, the light source device 2 is cooled by providing the light source heat absorption heat exchanger 25 to absorb heat from the solid light source. The heat exchange liquid flowing through the radiator heated by absorbing heat from the solid light source of the light source device 2 is supplied to the light source heat dissipation heat exchanger 9 through a cooling flow path (not shown). The light source device 2 is disposed on the right side (+X side), which is one side in the left-right direction X intersecting the optical axis AX2 of the projection optical device 4, with respect to the image forming apparatus 3 within the exterior housing 5.

[0051] The heat exchanger 9 for heat dissipation of the light source dissipates the heat absorbed by the heat exchanger 25 for heat absorption of the light source, thereby reducing the temperature of the heat exchange liquid. In the present embodiment, the heat exchanger 9 for heat dissipation of the light source is constituted by a radiator. The heat exchanger 9 for heat dissipation of the light source is a heat exchanger that absorbs heat from the air flow by exchanging heat with the air flow through the heat exchange liquid flowing into the interior thereof. The heat exchange liquid whose temperature has been reduced by being cooled by the heat exchanger 9 for heat dissipation of the light source is supplied again to the heat exchanger 25 for heat absorption of the light source through the cooling flow path.

[0052] According to the projector 1 of the present embodiment, by circulating the heat exchange liquid between the heat exchanger 25 for heat absorption of the light source and the heat exchanger 9 for heat dissipation of the light source, the cooling efficiency in the heat exchanger 25 for heat absorption of the light source can be enhanced. Therefore, the light source device 2 can be cooled stably and efficiently.

[0053] The right side surface portion 54 has an air intake port 54a and an exhaust port 54b. The air intake port 54a is provided at a position facing the light source device 2 and takes in outside air at a predetermined position of the light source device 2. Note that a filter for collecting dust contained in the air passing through the air intake port 54a may be provided. The exhaust port 54b is provided at a position facing the exhaust heat fan 13. The exhaust heat fan 13 discharges the heat inside the exterior housing 5 to the outside through the exhaust port 54b, thereby releasing the heat inside the exterior housing 5 to the outside and cooling the inside of the exterior housing 5.

[0054] The cooling device 6 of the present embodiment includes a cooling unit 60. The cooling unit 60 is located on the left side (-X side) in the horizontal direction X with respect to the image forming device 3 inside the exterior housing 5. The cooling unit 60 is configured by unitizing a part of the constituent members of the cooling device 6. The cooling unit 60 is a unitization of the panel heat dissipation heat exchanger 8, the light source heat dissipation heat exchanger 9, and a plurality of heat exchanger fans 17 in the cooling device 6. That is, the cooling unit 60 cools the light source device 2 and the image forming device 3.

[0055] As shown in FIG. 1, in the cooling unit 60, the heat exchanger fan 17 is disposed between the panel heat radiator 8 and the left side surface portion 53 of the exterior housing 5. The left side surface portion 53 has a plurality of exhaust ports 53a provided at positions facing the panel heat radiator 8. Each exhaust port 53a discharges the exhaust air inside the exterior housing 5 by each heat exchanger fan 17 to the outside.

[0056] As shown in FIGS. 1 and 2, the bottom surface portion 56 of the exterior housing 5 includes an intake port 56a. The intake port 56a extends from a position facing the space between the panel heat radiator 8 of the cooling unit 60 and the image forming apparatus 3 to a position facing the space between the panel heat radiator 8 and the light source heat radiator 9 on the bottom surface portion 56. The intake port 56a of the present embodiment corresponds to the "first opening".

[0057] As shown in FIG. 2, the base 15 has an opening 150 formed by a through hole provided at a position corresponding to the intake port 56a of the exterior housing 5, and a second beam member 151 straddling the opening 150. The opening 150 surrounds the outer shape of the intake port 56a and has a rectangular shape that is long in the front-rear direction Y. By providing the opening 150 in the base 15 in this way, the intake port 56a can take in outside air into the exterior housing 5. That is, the opening 150 of the base 15 communicates the intake port 56a of the exterior housing 5 with the heat exchanger fan 17. The opening 150 of the present embodiment corresponds to the "second opening".

[0058] The second beam member 151 is provided so as to straddle the central portion of the opening 150 in the left-right direction X. The second beam member 151 is a member for reinforcing the base 15. By providing the base 15 with the second beam member 151, it is possible to minimize the decrease in rigidity due to the opening 150.

[0059] Returning to FIG. 1, the front portion 51 of the exterior housing 5 further includes an air inlet 51b. The air inlet 51b is provided at least at a position facing the space between the panel heat exchanger 8 of the cooling unit 60 and the image forming apparatus 3, and takes in outside air as an air flow K into the exterior housing 5. In the case of the present embodiment, the air inlet 51b extends to a position facing the space between the panel heat exchanger 8 and the light source heat exchanger 9.

[0060] The rear portion 52 of the exterior housing 5 includes an air inlet 52a. The air inlet 52a is provided at least at a position facing the space between the panel heat exchanger 8 of the cooling unit 60 and the image forming apparatus 3, similar to the air inlet 51b, and takes in outside air as an air flow K into the exterior housing 5. In the case of the present embodiment, the air inlet 52a extends to a position facing the space between the panel heat exchanger 8 and the light source heat exchanger 9.

[0061] Based on such a configuration, in the cooling unit 60, the heat exchanger fan 17 is configured such that the air flow K taken into the exterior housing 5 through the air inlet 51b, the air inlet 52a, and the air inlet 56a is exhausted from the exhaust port 53a via the panel heat exchanger 8 and the light source heat exchanger 9.

[0062] In the cooling unit 60, the panel heat exchanger 8 and the light source heat exchanger 9 overlap in the flow direction of the air flow K, and the air flow K flows from the panel heat exchanger 8 toward the light source heat exchanger 9. The temperature of the heat generated by the light source device 2 is higher than the temperature of the heat generated by the image forming apparatus 3. In the cooling unit 60 of the present embodiment, since the air flow K flows through the panel heat exchanger 8 first, the cooling efficiency of each of the light modulation panels 32R, 32G, 32B can be improved. Note that filters for collecting dust contained in the air flow K may be provided for each of the air inlets 51b, 52a, 56a.

[0063] Since the cooling unit 60 of the present embodiment has a plurality of heat exchanger fans 17 as described above, there is a possibility of generating vibration during driving. In the projector 1 of the present embodiment, by fixing the cooling unit 60 to the metal base 15, the vibration of the cooling unit 60 is suppressed from being transmitted to the projection optical device 4, thereby suppressing the shaking of the projected image.

[0064] As shown in FIG. 2, the projector 1 of the present embodiment further includes a first support portion 71, a second support portion 72, a first beam member 73, and a circuit board 74 including a control device 74a that controls each member of the projector 1.

[0065] The first support portion 71 is a sheet metal member provided to stand up from the base 15. The first support portion 71 stands up in the vertical direction Z from the left side (-X) of the fixing position of the image forming device 3 on the first surface 15a of the base 15. The first support portion 71 may be integrally formed with the base 15 or may be formed of a separate member from the base 15. The first support portion 71 of the present embodiment is formed of a separate member from the base 15 and is fixed, for example, to the attachment portion of the first surface 15a of the base 15. The first support portion 71 has an extending portion 71a that extends along the front-rear direction Y along the longitudinal direction of the radiator in the cooling unit 60. Further, the extending portion 71a extends along the front-rear direction Y in which the plurality of fans 17 are arranged.

[0066] The second support portion 72 is a sheet metal member provided to stand up from the base 15 on the side opposite to the first support portion 71 of the image forming device 3. The second support portion 72 stands up in the vertical direction Z from the right side (+X) of the fixing position of the image forming device 3 on the first surface 15a of the base 15. The second support portion 72 may be integrally formed with the base 15 or may be formed of a separate member from the base 15. The second support portion 72 of the present embodiment is formed of a separate member from the base 15 and is fixed, for example, to the attachment portion of the first surface 15a of the base 15. The first support portion 71 and the second support portion 72 are provided on the first surface 15a of the base 15 so as to sandwich the fixing position of the image forming device 3 in the left-right direction X.

[0067] FIG. 3 is a cross-sectional view showing the configuration of the main part of the projector 1 of this embodiment. 3, the circuit board 74 is supported by the first support portion 71 and the second support portion 72. Specifically, the circuit board 74 is fixed to the extending portion 71a of the first support portion 71 and the upper surface 72a of the second support portion 72 via screws or the like.

[0068] The first beam member 73 connects and fixes the first support portion 71 and the side of the cooling unit 60 opposite the base 15 to each other. Specifically, the first beam member 73 connects and fixes the surface of the circuit board 74 fixed to the extension portion 71a of the first support portion 71 to the upper end portion 60a of the cooling unit 60 with screw members S. In other words, the first beam member 73 is fixed to the first support portion 71 via the circuit board 74.

[0069] Based on this configuration, the cooling unit 60 has a lower side (-Z) in the vertical direction Z fixed to the first surface 15a of the base 15, and an upper side (+Z) in the vertical direction Z fixed to a first support portion 71 that stands up from the first surface 15a of the base 15 by a first beam member 73. In other words, the cooling unit 60 has a structure in which both ends in the vertical direction Z are fixed.

[0070] Next, the configuration of the cooling unit 60 will be described. 4 and 5 are perspective views showing the configuration of the cooling unit 60. Fig. 4 is a view of the configuration of the left side (-X) of the cooling unit 60 viewed from an oblique direction, and Fig. 5 is a view of the right side (+X) of the cooling unit 60 viewed from an oblique direction.

[0071] 4 or 5, the panel heat dissipation heat exchanger 8 of the cooling unit 60 includes a radiator 80 having a flat plate shape, a reservoir tank 83, and a pump 84. The radiator 80, the tank 83, and the pump 84 are connected via piping through which a heat exchange liquid flows.

[0072] As shown in FIG. 5, for the heat exchanger 8 for panel heat dissipation, the outflow portion 82 of the pipe connection member 85 is connected to the inlet 83a of the tank 83 via the pipe CM1. A pipe CM2 is connected to the outlet 83b of the tank 83. The pipes CM1 and CM2 are configured in a state of being bent into a predetermined shape by combining a plurality of pipe members and a plurality of connecting members.

[0073] The pump 84 discharges the heat exchange liquid from the outlet 83b of the tank 83. The liquid discharged from the outlet 83b of the tank 83 is connected to the inflow portion of the heat exchanger 7 for panel heat absorption via the pipe CM2.

[0074] In the heat exchanger 8 for panel heat dissipation, the inflow portion 81 of the pipe connection member 85 is connected to the outflow portion in the heat exchanger 7 for panel heat absorption via the pipe CM3. The pipe CM3 is configured in a state of being bent into a predetermined shape by combining a plurality of pipe members and a plurality of connecting members. Based on such a configuration, the heat exchange liquid discharged from the heat exchanger 7 for panel heat absorption flows into the heat exchanger 8 for panel heat dissipation via the pipe CM3.

[0075] Further, the heat exchanger 9 for light source heat dissipation of the cooling unit 60 includes a radiator 90 having a flat plate shape, a tank 93 for a reservoir, and a pump 94. The radiator 90, the tank 93, and the pump 94 are connected via pipes through which the heat exchange liquid flows.

[0076] In the heat exchanger 9 for light source heat dissipation, the outflow portion 92 of the pipe connection member 95 is connected to the inlet 93a of the tank 93 via the pipe CM4. A pipe CM5 is connected to the outlet 93b of the tank 93. The pipes CM4 and CM5 are configured in a state of being bent into a predetermined shape by combining a plurality of pipe members and a plurality of connecting members.

[0077] The pump 94 discharges the liquid for heat exchange from the outlet 93b of the tank 93. The liquid discharged from the outlet 93b of the tank 93 is connected to the inlet of the heat exchanger for light source heat absorption 25 via the pipe CM5.

[0078] In the heat exchanger for light source heat dissipation 9, the inlet 91 of the pipe connection member 95 is connected to the outlet of the heat exchanger for light source heat absorption 25 via the pipe CM6. The pipe CM6 is configured in a bent state in a predetermined shape by combining a plurality of pipe members and a plurality of connecting members. Based on such a configuration, the liquid for heat exchange discharged from the heat exchanger for light source heat absorption 25 flows into the heat exchanger for light source heat dissipation 9 via the pipe CM6.

[0079] The cooling unit 60 of the present embodiment further includes a metal radiator holder 61 that holds the radiators 80 and 90, a metal pump holder 62 that holds the pumps 84 and 94 and the tanks 83 and 93, and a metal fan holder 64 that holds the heat exchanger fan 17. In the present embodiment, the radiator holder 61 corresponds to the "first holder", the pump holder 62 corresponds to the "second holder", and the fan holder 64 corresponds to the "third holder".

[0080] As shown in FIG. 5, the pump holder 62 holds the pumps 84 and 94 attached to the tanks 83 and 93 by holding the tanks 83 and 93. Note that the pump holder 62 may adopt a configuration of directly holding the pumps 84 and 94.

[0081] The pump holder 62 is located lower (-Z) in the vertical direction Z than the fan holder 64. The tanks 83, 93 are located between the base 15 and the heat exchanger fan 17 in the vertical direction Z where the first support portion 71 stands up from the first surface 15a of the base 15. In other words, the tanks 83, 93 are disposed closer to the base 15 than the heat exchanger fan 17. Here, the tanks 83, 93 are components that are relatively heavy within the cooling unit 60 because they store liquid for heat exchange. Therefore, according to the cooling unit 60 of this embodiment, since the tanks 83, 93 are disposed closer to the base 15, the center of gravity of the cooling unit 60 can be shifted toward the base 15, and the rotational moment due to vibration of the heat exchanger fan 17 can be reduced.

[0082] The pump holder 62 is fixed to the radiator holder 61 and the fan holder 64 with screw members S. In the cooling unit 60 of this embodiment, the holders 61, 62, and 64, each made of metal, are connected and fixed together to increase rigidity, thereby suppressing the generation of vibrations during operation.

[0083] The fan holders 64 are provided corresponding to the multiple heat exchanger fans 17. In other words, the cooling unit 60 has four fan holders 64, the same number as the heat exchanger fans 17. By providing a fan holder 64 for each heat exchanger fan 17, the cooling unit 60 of this embodiment can reduce the vibration of the entire cooling unit 60 by dispersing the vibration of each heat exchanger fan 17 compared to a configuration in which one holder holds multiple fans.

[0084] In this embodiment, the fan holder 64 is secured to the four corners of the heat exchanger fan 17, which has a rectangular outer shape, with screw members S1. This allows the heat exchanger fan 17 to be firmly held in the fan holder 64, further reducing vibrations that occur during operation.

[0085] As shown in FIG. 4, in the present embodiment, the first beam member 73 is fixed to the radiator holder 61 with a screw member S. The radiator holder 61 and the fan holder 64 are connected to each other. For example, the radiator holder 61 and the fan holder 64 are connected and fixed via a screw member S.

[0086] As shown in FIG. 4, the first beam member 73 has a plate-like portion 73a disposed overlapping the extending portion 71a of the first support portion 71, and a fixing portion 73b that connects and fixes both end portions of the plate-like portion 73a to the radiator holder 61. That is, the first beam member 73 has a substantially U-shaped planar shape when viewed from above (+Z). The fixing portion 73b of the first beam member 73 is fixed to the upper surface 61a of the radiator holder 61 via a screw member S.

[0087] As described above, since both end portions in the vertical direction Z of the cooling unit 60 of the present embodiment are fixed, it is possible to suppress the generation of rotational moment due to vibration during the operation of the heat exchanger fan 17 and the pumps 84 and 94. Therefore, it is possible to suppress the vibration transmitted from the rocking of the cooling unit 60 to the projection optical device 4 and shaking the projected image.

[0088] Subsequently, the electrical configuration of the projector 1 will be described. FIG. 6 is a block diagram showing the electrical configuration of the projector 1 of the present embodiment. As shown in FIG. 6, the projector 1 of the present embodiment further includes a control device 100 that controls the operation of the projector 1. The control device 100 includes a control unit 101, a storage unit 102, and a drive unit 103.

[0089] The control unit 101 is constituted by a processor such as a CPU (Central Processing Unit), for example. Note that part or all of the functions of the control unit 101 may be constituted by circuits such as a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array).

[0090] The control unit 101 performs signal processing on signals input from the outside and acquires information necessary for controlling the light source device 2, the cooling device 6, and the image forming device 3. For example, the control unit 101 outputs control signals for each device required for image generation based on an image signal input from an external device.

[0091] The storage unit 102 includes an HDD (Hard Disk Drive), an SSD (Solid State Drive), an EEPROM (Electrically Erasable Programmable Read Only Memory), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The storage unit 102 stores, for example, various programs, various instructions, various information, etc. that the projector 1 processes during operation. The control unit 101 reads predetermined information from the storage unit 102 and outputs control signals for each device to the drive unit 103. The drive unit 103 generates drive signals for each of the light source device 2, the cooling device 6, and the image forming device 3 based on the control signals output from the control unit 101.

[0092] In the projector 1 of the present embodiment, the control device 100 drives the heat exchanger fan 17 of the cooling device 6 by PWM control using pulse width modulation (PWM). Hereinafter, the heat exchanger fan 17 may sometimes be simply referred to as the fan 17.

[0093] Incidentally, the vibration of the fan 17 is transmitted to the exterior housing 5 and the like. Since the rotational speed of the fan 17 changes according to the situation during driving, there is a possibility that the vibration frequency caused by the fan 17 overlaps with the natural frequency of the projector 1. Then, the entire projector 1 may vibrate due to resonance and the projection optical device 4 may shake, which may deteriorate the quality of the projected image.

[0094] As described above, the projector 1 of the present embodiment employs a structure that suppresses the generation of rotational moment due to the vibration of the fan 17 by fixing both end portions in the vertical direction Z of the cooling unit 60. Therefore, the width of the band of the natural frequency of the projector 1 can be reduced. For this reason, it becomes difficult for the vibration frequency caused by the fan 17 to overlap with the natural frequency of the projector 1, and it is easy to suppress the shaking of the projected image due to resonance.

[0095] Further, in the projector 1 of the present embodiment, the control device 100 drives the fan 17 by PWM control in which the duty ratio overlapping the resonance band that resonates with the natural frequency of the projector 1 is removed. In this specification, the PWM control in which the duty ratio overlapping the resonance band is removed is also referred to as PWM control that skips the duty ratio overlapping the resonance band (hereinafter, simply referred to as skip control). Further, in this specification, the case where the duty ratio overlaps the resonance band may also be referred to as "the duty ratio overlaps the prohibited region".

[0096] Thereby, the projector 1 of the present embodiment suppresses the occurrence of a resonance phenomenon with the projector 1 due to the rotation of the fan 17, and can suppress a deterioration in quality due to the shaking of the projected image caused by the resonance vibration. The projector 1 of the present embodiment performs the above-described skip control on the fan 17. Note that the control device 100 may drive other fans of the cooling device 6 by normal PWM control that does not perform skip control, or may perform PWM control including the above-described skip control.

[0097] The skip control by the control device 100 will be described below. FIG. 7 is a graph schematically showing the change in the duty ratio in the skip control. In FIG. 7, the vertical axis represents the duty ratio, and the horizontal axis represents time.

[0098] In FIG. 7, the fan 17 to which a duty ratio overlapping the prohibited region A is input rotates at a rotational frequency overlapping the resonance band that resonates with the natural frequency of the projector 1. That is, the duty ratio overlapping the prohibited region A resonates the projector 1 by the rotation of the fan 17, causing the projected image to shake. The first region A1 is a region where the duty ratio is lower than the prohibited region A and is a region where resonance due to the rotation of the fan 17 does not occur. The second region A2 is a region where the duty ratio is higher than the prohibited region A and is a region where resonance due to the rotation of the fan 17 does not occur.

[0099] As shown in FIG. 7, the control device 100 drives the fan 17 while gradually increasing the duty ratio input to the fan 17 based on the drive parameters defining the relationship between the duty ratio and the rotational speed stored in the storage unit 102 shown in FIG. 6, starting from the first region A1. In the first region A1, the control device 100 drives the fan 17 using normal PWM control rather than skip control.

[0100] The duty ratio eventually reaches the lower limit of the prohibited region A. At this time, the control device 100 holds the duty ratio at the boundary value on the lower limit side of the prohibited region A that does not overlap the prohibited region A until the duty ratio required for driving the fan 17 exceeds the prohibited region A. That is, during the prohibited region A, the control device 100 drives the fan 17 at a value lower than the duty ratio required to drive the fan 17. When the duty ratio required to drive the fan 17 exceeds the prohibited region A and reaches the second region A2, the control device 100 drives the fan 17 at the duty ratio of the boundary value on the upper limit side of the prohibited region A that does not overlap the prohibited region A from the boundary value on the lower limit side of the prohibited region A. That is, the control device 100 drives the fan 17 at a duty ratio that skips the prohibited region A.

[0101] In addition, the control device 100 may perform skip control shown by the dashed line in Figure 7, in which, when the duty ratio required to drive the fan 17 reaches the lower boundary value of the prohibited area A, the duty ratio is skipped to the upper boundary value of the prohibited area A that does not overlap with the prohibited area A, and the duty ratio is maintained at the upper boundary value of the prohibited area A until the duty ratio required to drive the fan 17 exceeds the upper boundary value of the prohibited area A.

[0102] That is, when the input duty ratio overlaps with the prohibited area A, the control device 100 changes the input duty ratio to one that exceeds the prohibited area A and drives the fan 17 at the changed input duty ratio for a predetermined period. With this configuration, the input duty ratio is maintained at a value that skips the prohibited area A, so it is possible to reliably prevent a duty ratio that overlaps with the prohibited area A from being input to the fan 17.

[0103] When the input duty ratio input to fan 17 overlaps with prohibited area A, control device 100 maintains the input duty ratio at the upper boundary value of prohibited area A. With this configuration, fan 17 is driven at a duty ratio higher than the duty ratio actually required for driving, thereby increasing the cooling capacity of fan 17. Therefore, it is possible to control projector 1 with priority given to the cooling performance of cooling unit 60. Then, the fan 17 is driven by normal PWM control that gradually increases the rotation speed up to the target rotation speed in the second region A2.

[0104] Furthermore, for example, when the temperature of the heat source drops and the target rotation speed is set to the first region A1, the control device 100 gradually decreases the duty ratio toward the first region A1 in accordance with the drive parameters, thereby gradually lowering the rotation speed of the fan 16. That is, in the second region A2, the control device 100 drives the fan 17 by normal PWM control, not skip control.

[0105] The duty ratio will eventually reach the upper limit of the prohibited region A. At this time, the control device 100 maintains the duty ratio at the boundary value on the upper limit side of the prohibited region A that does not overlap with the prohibited region A until the duty ratio required for driving the fan 17 exceeds the prohibited region A. That is, during the prohibited region A, the control device 100 drives the fan 17 at a value higher than the duty ratio required to drive the fan 17. When the duty ratio required to drive the fan 17 reaches the first region A1 beyond the prohibited region A, the control device 100 drives the fan 17 at the duty ratio from the boundary value on the upper limit side of the prohibited region A to the boundary value on the lower limit side of the prohibited region A that does not overlap with the prohibited region A. That is, the control device 100 drives the fan 17 at the duty ratio that skips the prohibited region A. Then, the fan 17 is driven by normal PWM control up to the target rotation speed in the first region A1.

[0106] Note that when the duty ratio required to drive the fan 17 reaches the boundary value on the upper limit side of the prohibited region A, the control device 100 may perform skip control shown by the broken line in FIG. 7, in which the duty ratio is skipped to the boundary value on the lower limit side of the prohibited region A that does not overlap with the prohibited region A, and then the duty ratio is maintained at the boundary value on the lower limit side of the prohibited region A until the duty ratio required to drive the fan 17 exceeds the boundary value on the lower limit side of the prohibited region A.

[0107] As described above, when increasing or decreasing the input duty ratio input to the fan 17 based on the drive parameter, if the input duty ratio overlaps with the prohibited region A of the projector 1, the control device 100 of the present embodiment maintains the input duty ratio at the boundary value of the prohibited region A until the input duty ratio exceeds the prohibited region A. Therefore, since the control device 100 does not drive the fan 17 at the duty ratio that resonates with the natural frequency of the projector 1, it is possible to suppress the shaking of the projected image due to the resonance phenomenon.

[0108] One skip control, when increasing the rotational speed from the first region A1 to the second region A2, when the duty ratio reaches the boundary value on the lower limit side of the prohibited region A, until the required duty ratio exceeds the prohibited region A, the duty ratio is maintained at the boundary value on the lower limit side of the prohibited region A and then the duty ratio is skipped. After that, when decreasing the rotational speed from the second region A2 to the first region A1, when the duty ratio reaches the boundary value on the upper limit side of the prohibited region A, after skipping the duty ratio to the boundary value on the lower limit side of the prohibited region A, the duty ratio is maintained at the boundary value on the lower limit side of the prohibited region A until the required duty ratio exceeds the boundary value on the lower limit side of the prohibited region A.

[0109] Another skip control, when increasing the rotational speed from the first region A1 to the second region A2, when the duty ratio reaches the boundary value on the lower limit side of the prohibited region A, after skipping the duty ratio to the boundary value on the upper limit side of the prohibited region A, the duty ratio is maintained at the boundary value on the upper limit side of the prohibited region A until the required duty ratio exceeds the boundary value on the upper limit side of the prohibited region A. After that, when decreasing the rotational speed from the second region A2 to the first region A1, when the duty ratio reaches the boundary value on the upper limit side of the prohibited region A, the duty ratio is maintained at the boundary value on the upper limit side of the prohibited region A until the required duty ratio exceeds the boundary value on the lower limit side of the prohibited region A and then the duty ratio is skipped.

[0110] As described above, the projector 1 of the present embodiment includes an exterior housing 5 that constitutes the exterior, a metal base 15 fixed to the bottom surface portion 56 that is the inner surface of the exterior housing 5, a light source device 2 fixed to the base 15, an image forming device 3 fixed to the base 15 that modulates the light from the light source device 2 into image light, a projection optical device 4 fixed to the base 15 that projects the image light, a cooling unit 60 fixed to the base 15 that generates vibration by driving, a first support portion 71 standing up from the base 15, and a first beam member 73 that connects and fixes the first support portion 71 and the opposite side of the base 15 in the cooling unit 60 to each other.

[0111] According to the projector 1 of the present embodiment, both end portions in the vertical direction Z of the cooling unit 60 are held in a fixed state, and the generation of a rotational moment due to the vibration during the drive of the cooling unit 60 is suppressed. As a result, the vibration caused by the swinging of the cooling unit 60 is not transmitted to the projection optical device 4, and it is possible to suppress the projection image from swaying. Therefore, even for the projector 1 including the cooling unit 60 that generates vibration during drive, it is possible to provide a projector that suppresses deterioration of the image quality due to the swaying of the projection image.

[0112] Further, in the projector 1 of the present embodiment, since the rotation speed of the fan 17 can be finely controlled by PWM control, the control of the fan 17 can be precisely controlled. Therefore, the projector 1 of the present embodiment can enhance the cooling effect by the cooling unit 60 while suppressing the swaying of the projection image.

[0113] In the projector 1 of the present embodiment, since the vibration suppression structure of the cooling unit 60 is adopted, the width of the band of the natural frequency of the projector 1 is reduced. For this reason, the band of the duty ratio skipped in the above-described skip control also becomes narrow. That is, in the case of the present embodiment, since the band of the duty ratio when driving the fan 17 is widened, the fan 17 can be efficiently driven. Therefore, the cooling efficiency of the cooling unit 60 by the fan 17 can be further improved.

[0114] (Second Embodiment) Hereinafter, the projector of the second embodiment will be described. The basic configuration of the projector of the second embodiment is the same as that of the first embodiment, but the fixing structure of the cooling unit is different from that of the first embodiment. The same reference numerals are given to the configurations and members common to the first embodiment, and the detailed description thereof will be omitted.

[0115] FIG. 8 is a cross-sectional view showing a schematic configuration of the cooling unit 160 of the present embodiment. As shown in FIG. 8, in the cooling unit 160 of the projector 1A of the present embodiment, the fan holder 64 is provided corresponding to a plurality of heat exchanger fans 17 arranged side by side along the front-rear direction Y. That is, the cooling unit 160 has four fan holders 64, the same number as the heat exchanger fans 17. In the present embodiment, the fan holder 64 corresponds to the "fourth holder". According to this configuration, compared with a configuration in which a plurality of fans are held by one holder, the vibration of the entire cooling unit 160 can be reduced by dispersing the vibration of each heat exchanger fan 17.

[0116] The first beam member 173 is connected to at least one of the plurality of fan holders 64 by a screw member S. The first beam member 173 has a plate-like portion 173a disposed overlapping the extending portion 71a of the first support portion 71, and fixing portions 173b that connect and fix both end portions of the plate-like portion 173a and the fan holder 64. The first beam member 173 of the present embodiment has a substantially U-shaped planar shape when viewed from above (+Z). The fixing portion 173b of the first beam member 173 is fixed to the upper surface 64a of at least one fan holder 64 via a screw member S.

[0117] According to the cooling unit 160 of the present embodiment, since the fan holder 64 that holds the heat exchanger fan 17 is fixed to the first support portion 71 that stands up from the base 15 by the first beam member 173, the vibration of the heat exchanger fan 17 can be made smaller. Therefore, the generation of the rotational moment due to the vibration of the heat exchanger fan 17 can be efficiently suppressed. Therefore, according to the projector 1A of the present embodiment, similar to the first embodiment, it is possible to suppress the shaking of the projected image caused by the vibration transmitted from the swinging of the cooling unit 160 to the projection optical device 4.

[0118] Note that the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. In addition, the specific configurations such as the number, arrangement, shape, and material of various components constituting the projector and the image forming apparatus are not limited to the above-described embodiments, and can be changed as appropriate.

[0119] Hereinafter, a summary of the present disclosure is appended. (Appendix 1) An exterior housing constituting the exterior, A metal base fixed to the inner surface of the exterior housing, A light source device fixed to the base, An image forming device fixed to the base that modulates light from the light source device into image light, A projection optical device fixed to the base that projects the image light, A cooling unit fixed to the base that generates vibration by driving, A first support portion standing up from the base, A first beam member that connects and fixes the first support portion and the opposite side of the base in the cooling unit to each other, A projector characterized by the above.

[0120] According to the projector of Appendix 1, one end of the cooling unit is fixed to a metal base, and the other end opposite to the base of the cooling unit is fixed to a first support portion standing up from the base by a first beam member. Thereby, the generation of rotational moment due to the vibration during driving of the cooling unit is suppressed, so that it is possible to suppress the vibration transmitted from the rocking of the cooling unit to the projection optical device and the occurrence of shaking in the projected image. Therefore, even when a cooling unit that generates vibration during driving is provided, it is possible to provide a projector that suppresses image quality degradation due to shaking of the projected image.

[0121] (Appendix 2) The cooling unit has a fan. The projector according to Appendix 1, characterized by the above.

[0122] According to the configuration of Supplementary Note 2, it is possible to suppress the generation of rotational moment due to vibration during the driving of the fan.

[0123] (Supplementary Note 3) The cooling unit includes a radiator, a pump, and a tank connected by pipes through which a liquid flows, a first metal holder for holding the radiator, and a second metal holder connected to the first holder and holding the pump and the tank. The first beam member is fixed to the first holder. The projector according to Supplementary Note 2, characterized in that.

[0124] According to the configuration of Supplementary Note 3, even when using a cooling unit having a pump as a vibration source, it is possible to provide a projector that suppresses image quality degradation due to shaking of the projected image.

[0125] (Supplementary Note 4) The cooling unit further includes a third metal holder for holding the fan, and the third holder is connected to the first holder and the second holder. The projector according to Supplementary Note 3, characterized in that.

[0126] According to the configuration of Supplementary Note 4, by connecting the holders to each other, it is possible to significantly suppress the vibration of the cooling unit.

[0127] (Supplementary Note 5) The first support portion has an extending portion extending along the longitudinal direction of the radiator, and the first beam member has a plate-like portion disposed overlapping the extending portion, and fixing portions for connecting and fixing both end sides of the plate-like portion and the first holder. The projector according to Supplementary Note 3 or Supplementary Note 4, characterized in that.

[0128] According to the configuration of Supplementary Note 5, the vibration of the cooling unit can be effectively suppressed by the extending portion of the first support portion extending along the longitudinal direction of the radiator and the plate-like portion of the first beam member disposed overlapping the extending portion.

[0129] (Supplementary Note 6) The cooling unit has a fourth metal holder that holds the fan, The first beam member is fixed to the fourth holder, The projector according to Supplementary Note 2, characterized in that.

[0130] According to the configuration of Supplementary Note 6, since the fourth holder that holds the fan is fixed to the first support portion by the first beam member, the vibration of the fan can be made smaller. Therefore, the generation of the rotational moment due to the vibration of the fan can be efficiently suppressed.

[0131] (Supplementary Note 7) In the cooling unit, a plurality of the fans are arranged side by side, The projector according to Supplementary Note 6, characterized in that.

[0132] According to the configuration of Supplementary Note 7, even when the cooling performance of the cooling unit is enhanced by having a plurality of fans, it is possible to suppress deterioration of the image quality due to shaking of the projected image.

[0133] (Supplementary Note 8) The cooling unit has a plurality of the fourth holders respectively corresponding to the plurality of fans, The first beam member is connected to at least one of the plurality of the fourth holders, The projector according to Supplementary Note 7, characterized in that.

[0134] According to the configuration of Supplementary Note 8, since each of the plurality of fans is fixed to the fourth holder, the vibration of the entire cooling unit can be reduced by dispersing the vibration of each fan.

[0135] (Supplementary Note 9) The first support portion has an extending portion that extends along the direction in which the plurality of fans are arranged. The first beam member has a plate-like portion disposed overlapping the extending portion, and a fixing portion that connects and fixes both end sides of the plate-like portion and the fourth holder. The projector according to any one of Appendices 6 to 8, characterized in that.

[0136] According to the configuration of Appendix 9, the vibration of the cooling unit can be effectively suppressed by the extending portion of the first support portion that extends along the direction in which the plurality of fans are arranged, and the plate-like portion of the first beam member disposed overlapping the extending portion.

[0137] (Appendix 10) The tank is located between the base and the fan in the direction in which the first support portion stands up from the base. The projector according to any one of Appendices 3 to 5, characterized in that.

[0138] According to the configuration of Appendix 10, since the tank is disposed near the base, the center of gravity position of the cooling unit can be shifted to the base side, and the rotational moment due to the vibration of the fan can be reduced.

[0139] (Appendix 11) The cooling unit cools at least one of the image forming device and the light source device. The projector according to any one of Appendices 1 to 10, characterized in that.

[0140] According to the configuration of Appendix 11, by cooling at least one of the image forming device and the light source device, the occurrence of malfunction due to heat can be suppressed.

[0141] (Appendix 12) The exterior housing has a first opening in a region facing the cooling unit. The base has a second opening that communicates the first opening and the fan, and a second beam member that straddles the second opening. The projector according to any one of Appendices 2 to 10, characterized in that...

[0142] According to the configuration of Appendix 12, by providing the second beam member, it is possible to minimize the decrease in the rigidity of the base due to the opening.

[0143] (Appendix 13) The fan is controlled by pulse width modulation and is driven by removing the duty ratio that overlaps with the resonance band corresponding to the natural frequency of the projector. The projector according to any one of Appendices 2 to 10, characterized in that...

[0144] According to the configuration of Appendix 13, since the fan is not driven at the duty ratio that resonates with the natural frequency of the projector, it is possible to suppress the shaking of the projected image due to resonance. In addition, by adopting the vibration suppression structure of the cooling unit, the width of the band of the natural frequency of the projector becomes smaller, so the band of the duty ratio that resonates with the natural frequency also becomes narrower. For this reason, the band of the duty ratio when driving the fan widens, so the fan can be driven efficiently. Therefore, the cooling efficiency of the cooling unit by the fan can be further improved.

[0145] (Appendix 14) On the side opposite to the first support portion of the image forming apparatus, a second support portion standing up from the base, A circuit board supported by the first support portion and the second support portion, further comprising: The projector according to any one of Appendices 1 to 13, characterized in that...

[0146] According to the configuration of Appendix 14, it is possible to realize a configuration for stably supporting the circuit board via the first support portion and the second support portion.

[0147] (Appendix 15) On the side opposite to the cooling unit of the image forming apparatus, the base fixes the light source device on one surface and fixes the power supply device on the other surface opposite to the one surface. The light source device includes a fan for the light source, The power supply device includes a fan for the power supply, The projector according to any one of Appendices 1 to 14, characterized in that.

[0148] According to the configuration of Appendix 15, in the exterior housing, since the power supply device and the light source device are arranged so as to overlap in the thickness direction of the base, the footprint of the projector can be reduced. Further, since the light source device and the power supply device are fixed to the base, it is possible to suppress the shaking of the projected image caused by the vibration of the fan for the light source and the fan for the power supply being transmitted to the projection optical device.

[0149] (Appendix 16) Further provided with legs that contact the installation surface, The legs are fixed to the base, The projector according to any one of Appendices 1 to 15, characterized in that.

[0150] According to the configuration of Appendix 16, since the legs are fixed to the base, the vibration of the projector itself can be efficiently suppressed.

Explanation of Signs

[0151] 1, 1A... Projector, 2... Light source device, 3... Image forming device, 4... Projection optical device, 5... Exterior housing, 14... Power supply device, 14a... Fan for power supply, 15... Base, 17... Fan, 18... Legs, 20... Fan for light source, 56a... Air inlet (first opening), 60, 160... Cooling unit, 61... Holder for radiator (first holder), 62... Holder for pump (second holder), 64... Holder for fan (third holder, fourth holder), 71... First support portion, 71a... Extending portion, 72... Second support portion, 73, 173... First beam member, 73a, 173a... Plate-like portion, 73b, 173b... Fixed portion, 74... Circuit board, 80, 90... Radiator, 83, 93... Tank, 84, 94... Pump, 150... Opening (second opening), 151... Second beam member, CM1, CM2, CM3, CM4, CM5, CM6... Pipe, M... Installation surface.

Claims

1. An exterior housing that constitutes the exterior, A metal base fixed to the inner surface of the exterior housing, A light source device fixed to the base, An image forming device fixed to the base that modulates the light from the light source device into image light, A projection optical device fixed to the base that projects the image light, A cooling unit fixed to the base that generates vibration by driving, A first support portion standing up from the base, A first beam member that connects and fixes the first support portion and the opposite side of the base in the cooling unit to each other, A projector characterized by the above.

2. The cooling unit has a fan, The projector according to claim 1, characterized by the above.

3. The cooling unit, A radiator, a pump, and a tank connected by a pipe through which liquid flows, A first metal holder that holds the radiator, A second metal holder that is connected to the first holder and holds the pump and the tank, The first beam member is fixed to the first holder, The projector according to claim 2, characterized by the above.

4. The cooling unit further has a third metal holder that holds the fan, The third holder is connected to the first holder and the second holder, The projector according to claim 3, characterized by the above.

5. The first support portion has an extending portion that extends along the longitudinal direction of the radiator, The first beam member has a plate-like portion arranged to overlap the extending portion, and a fixing portion that connects and fixes both end sides of the plate-like portion and the first holder, The projector according to claim 3, characterized by the above.

6. The cooling unit has a fourth metal holder that holds the fan, The first beam member is fixed to the fourth holder, The projector according to claim 2, characterized by the above.

7. In the cooling unit, a plurality of the fans are arranged side by side, The projector according to claim 6, characterized by the above.

8. The cooling unit has a plurality of the fourth holders corresponding to the plurality of fans respectively, The first beam member is connected to at least one of the plurality of the fourth holders, The projector according to claim 7, characterized by the above.

9. The first support portion has an extending portion that extends along the direction in which the plurality of fans are arranged, The first beam member has a plate-shaped portion disposed overlapping the extending portion, and a fixing portion that connects and fixes both end sides of the plate-shaped portion and the fourth holder. The projector according to any one of claims 6 to 8, characterized in that.

10. The tank is located between the base and the fan in a direction in which the first support portion stands up from the base. The projector according to any one of claims 3 to 5, characterized in that.

11. The cooling unit cools at least one of the image forming apparatus and the light source device. The projector according to any one of claims 1 to 8, characterized in that.

12. The exterior housing has a first opening in a region facing the cooling unit. The base has a second opening that communicates the first opening and the fan, and a second beam member straddling the second opening. The projector according to any one of claims 2 to 8, characterized in that.

13. The fan is controlled by pulse width modulation and is driven with a duty ratio that does not overlap a resonance band corresponding to the natural frequency of the projector. The projector according to any one of claims 2 to 8, characterized in that.

14. A second support portion standing up from the base on the side opposite to the first support portion of the image forming apparatus. A circuit board supported by the first support portion and the second support portion is further provided. The projector according to any one of claims 1 to 8, characterized in that.

15. The base fixes the light source device on one surface and the power supply device on the other surface opposite to the one surface on the side opposite to the cooling unit of the image forming apparatus. The light source device includes a fan for the light source. The power supply device includes a fan for the power supply. The projector according to any one of claims 1 to 8, characterized in that.

16. It further includes legs that contact the installation surface. The legs are fixed to the base. The projector according to any one of claims 1 to 8, characterized in that.

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