JP6683288B2 - projector - Google Patents

Description

  The present invention relates to a projector.

Conventionally, an illuminating device, a light modulating device that modulates light emitted from the illuminating device to form an image according to image information, and a projection optical device that magnifies and projects the image on a projection surface such as a screen. There is known a projector provided with (see Patent Document 1, for example).
The projector described in Patent Document 1 includes a color separation optical device that separates a light flux emitted from a light source into red, green, and blue color lights, three liquid crystal panels provided for each of the separated color lights, and The liquid crystal panel includes a prism that synthesizes the color light modulated by each liquid crystal panel, and a cooling device that blows air introduced from the outside of the housing to the liquid crystal panel to cool the liquid crystal panel. Of these, cooling devices are provided according to the number of liquid crystal panels, and each cooling fan blows cooling air independently to the corresponding liquid crystal panel.

JP 2001-312003 A

By the way, in order to make the resolution of an image projected higher than the resolution of a light modulation device such as a liquid crystal panel, an optical path changing element for changing the optical path of the light is provided between the prism and the projection optical device to perform the optical modulation. It is conceivable to shift the axis of the image light emitted from the device. However, since the optical path changing element is disposed between the prism and the projection optical device, the projector cooling device described in Patent Document 1 cannot cool the optical path changing element. In addition, there is a problem in that the size and the brightness of the projector are increased, the size of the optical path changing element is increased, and the function of the optical path changing element is deteriorated due to the heat generated by the driving of the optical path changing element.
Therefore, there is a demand for a projector that can supply a cooling gas to a plurality of objects to be cooled, such as an optical modulator and an optical path changing element.

  The present invention is intended to solve at least a part of the above problems, and an object thereof is to provide a projector capable of supplying a cooling gas to a plurality of objects to be cooled.

  A projector according to an aspect of the present invention includes a light source, a light modulator that modulates light emitted from the light source, a projection optical device that projects light modulated by the light modulator, and the light modulator. An optical path changing element that is arranged between the projection optical device and changes the optical path of the light modulated by the optical modulator by swinging, and a cooling device that cools the optical modulator and the optical path changing element. It is characterized by being provided.

As the optical path changing element, a shift element that changes the optical path of incident light can be exemplified.
According to the above aspect, the cooling gas can be supplied to the plurality of optical modulation devices and the optical path changing elements that are cooling targets, so that the temperature of the optical modulation device can be prevented from rising. Further, since the optical path changing element is cooled by the cooling device, it is possible to prevent the temperature of the optical path changing element from rising due to the light incident from the optical modulator.

In the above aspect, a plurality of the light modulators and a light combiner that combines and emits the lights modulated by the plurality of light modulators are provided, and the projection optical device is emitted from the light combiner. It is preferable that light is projected and the optical path changing element is disposed between the light combining device and the projection optical device.
According to the above aspect, since the optical path changing element is arranged between the optical combining device and the projection optical device, when the optical path changing element is cooled, the optical combining device can be cooled together with the optical path changing element. Therefore, it is possible to prevent the temperature of the optical path changing element from rising due to the light incident from the photosynthesis device.

In the above one aspect, the cooling device includes a cooling fan that sends out a cooling gas, and a duct member that allows the cooling gas from the cooling fan to flow to the plurality of optical modulators, and the duct member is It is preferable to have a delivery port for circulating the cooling gas toward the optical path changing element.
According to the above aspect, since the duct member for circulating the cooling gas in the optical modulator has the outlet, it is not necessary to separately provide a cooling device for cooling the optical path changing element. According to this, the cooling device can be downsized, and the projector can be downsized.

In the above aspect, the optical path changing element is a permanent magnet, an optical member that changes the optical path of light that is oscillated by the permanent magnet, and a holding unit that holds the optical member and the permanent magnet. It is preferable to provide a pair of coils arranged in the holding part with the permanent magnet sandwiched therebetween.
Here, when electric power is supplied to the pair of coils arranged with the permanent magnet sandwiched between them, the permanent magnet is displaced, and thus the magnetic force for displacing the optical path changing element is generated, and the temperature of the coil rises. Thus, when the temperature of the coil rises, the magnetic force of the coil that generates the magnetic force may weaken.
On the other hand, according to the one aspect, since the cooling gas is supplied to the optical path changing element, it is possible to suppress the temperature of the optical path changing element, that is, the pair of coils included in the optical path changing element from rising. Therefore, the decrease in the magnetic force of the coil provided in the optical path changing element can be suppressed, and the driving of the optical path changing element can be stabilized.

In the above one aspect, the optical path changing element has a coil holding portion that holds the pair of coils and is attached to the holding portion, and the delivery port has at least a part of the cooling gas in the coil holding portion. It is preferably distributed.
According to the above aspect, since the coil is fixed to the holding portion of the optical path changing element while the coil is held by the coil holding portion, and at least a part of the cooling gas is circulated in the coil holding portion, the coil holding portion is surely held. Can be cooled. Therefore, by cooling the coil holding unit, it is possible to cool the coil held by the coil holding unit and suppress an increase in the temperature of the coil.

In the above-mentioned one mode, it is preferred that the coil holding part includes a heat dissipation part.
A fin or the like can be exemplified as the heat dissipation portion.
According to the above aspect, since the coil holding part includes the heat dissipation part, the heat dissipation amount of the coil holding part is larger than the heat dissipation amount of the coil holding part that does not have the heat dissipation part. According to this, the cooling gas is supplied to the heat radiation portion of the coil holding portion, so that the coil holding portion can be cooled more reliably. Therefore, it is possible to reliably cool the coil held by the coil holding portion and prevent the temperature of the coil from rising.

In the above-mentioned one mode, it is preferred that the coil holding part has an extension part that extends toward the delivery port side.
According to the above aspect, since the coil holding part has the extension part, the heat dissipation area of the coil holding part provided with the extension part is larger than the heat dissipation area of the coil holding part not having the extension part. According to this, since the cooling gas is supplied to the coil holding portion (extension portion), the coil holding portion can be cooled more reliably. Therefore, it is possible to reliably cool the coil held by the coil holding portion and prevent the temperature of the coil from rising.

In the above-mentioned one mode, the above-mentioned optical synthesizing device has three incidence planes into which light which went through the above-mentioned plurality of optical modulation devices, and one outgoing radiation from which the above-mentioned three incidence planes are made and the synthetic | combined light is radiate | emitted. A surface, and the duct member is provided corresponding to each of the plurality of optical modulators, and has a plurality of ducts for delivering the cooling gas flowing inside to the corresponding optical modulators, Among the plurality of ducts, the ducts corresponding to the optical modulators arranged on opposite sides of the photosynthesis device sandwich the cooling gas flowing inside, and send the cooling gas from the outlet. It is preferable to have a branched portion.
A cross dichroic prism can be used as the photosynthesis device.
According to the above aspect, the cooling gas can be supplied to the optical modulation device and the optical path changing element via two ducts corresponding to the optical modulation devices arranged on the opposite sides of the photosynthesis device. That is, since the cooling gas is supplied to the optical path changing element from the two outlets, the optical path changing element can be reliably cooled. Further, since the cooling gas can be supplied to the optical modulator and the optical path changing element without further providing a duct for circulating the cooling gas to the optical path changing element, the cooling device can be downsized and the projector can be downsized.

In the above aspect, the optical path changing element has two swing members including the permanent magnet and the pair of coils, and one of the optical modulators arranged on opposite sides of the optical combiner. One of the oscillating members is arranged on the side of the optical modulator, and the other oscillating member is arranged on the side of the other optical modulator, and the one oscillating member is on the side of the incident direction of light with respect to the optical member. As seen from the above, it is preferable that the optical member is arranged at a position opposite to the other rocking member with the optical member interposed therebetween.
According to the above aspect, the positions of the one oscillating member and the one optical modulator are close to each other, and the positions of the other oscillating member and the other optical modulator are close to each other. Therefore, since the positions of the respective light modulating devices arranged to face each other are close to the positions of the respective rocking members, the cooling gas is circulated from the ducts corresponding to the light modulating devices arranged in close proximity to the rocking members. The configuration of the branching portion can be simplified. Further, since the distance from the branch portion of the duct to the delivery port can be shortened, it is possible to suppress a decrease in the flow rate of the cooling gas flowing through the duct. Therefore, the optical path changing element can be cooled more reliably.

1 is a schematic perspective view showing the appearance of a projector according to a first embodiment of the invention. FIG. 3 is a schematic diagram showing a schematic configuration of the projector according to the first embodiment. FIG. 3 is a perspective view showing the electro-optical device and the cooling device of the projector according to the first embodiment. FIG. 3 is a plan view showing the electro-optical device and the cooling device according to the first embodiment. The perspective view which looked at the shift element concerning the above-mentioned 1st embodiment from the light incidence side. FIG. 3 is a plan view of the shift element according to the first embodiment seen from the light emitting side. FIG. 3 is a side view of the shift element according to the first embodiment. FIG. 3 is an exploded perspective view of the shift element according to the first embodiment. The perspective view which shows the cooling device which concerns on the said 1st Embodiment. The top view which shows the cooling device which concerns on the said 1st Embodiment. FIG. 3 is a cross-sectional view showing a cross section on the red light side of the electro-optical device, the shift element, and the cooling device according to the first embodiment. FIG. 3 is a cross-sectional view showing a cross section on the blue light side of the electro-optical device, the shift element, and the cooling device according to the first embodiment. FIG. 6 is a perspective view showing a shift element of the projector according to the second embodiment of the invention. FIG. 6 is a perspective view showing a shift element of a projector according to a third embodiment of the invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[External configuration of the projector]
FIG. 1 is a schematic perspective view showing a projector 1 according to this embodiment.
The projector 1 according to the present embodiment is a projection-type display that modulates light emitted from a lighting device 31 described below to form an image according to image information, and enlarges and projects the image on a projection surface such as a screen. It is a device.
As will be described later in detail, the projector 1 includes a shift element that changes the optical path of incident light, and the cooling device has a function of cooling the shift element in addition to the optical modulation device that will be described later.
As shown in FIG. 1, such a projector 1 includes an exterior housing 2 that constitutes an exterior.

The exterior housing 2 is formed in a substantially rectangular parallelepiped shape having a top surface portion 21, a bottom surface portion 22, a front surface portion 23, a rear surface portion 24, and left and right side surface portions 25 and 26.
An opening (not shown) for attaching and removing light source devices 31A and 31B, which will be described later, is formed in the top surface portion 21, and the opening is covered with a cover member 212.
Although not shown, the bottom surface portion 22 is provided with legs that come into contact with the installation surface such as an installation table when the installation surface is placed.
The front surface portion 23 is formed with an opening 231 through which a part of a projection optical device 35 constituting the image forming apparatus 3 described later is exposed.
In addition to these, although not shown, an inlet port for introducing the air outside the exterior housing 2 into the inside is formed in the right side surface portion 26, and a left side surface portion 25 is provided inside the exterior housing 2. An exhaust port for discharging air to the outside is formed.

[Internal configuration of projector]
FIG. 2 is a schematic diagram showing an internal configuration of the projector 1.
The projector 1 includes, in addition to the exterior housing 2, an image forming apparatus 3 and a cooling device 4 arranged in the exterior housing 2, as shown in FIG. In addition, although not shown, the projector 1 includes a control device that controls the projector 1 and a power supply device that supplies electric power to electronic components that configure the projector 1.

[Configuration of image forming apparatus]
The image forming apparatus 3 forms and projects an image according to the image information input from the control device. The image forming apparatus 3 includes an illumination device 31, a homogenizing device 32, a color separation device 33, an electro-optical device 34, a projection optical device 35, and an optical component casing 36.
Of these, the optical component casing 36 is a box-shaped casing in which the illumination optical axis Ax is set, and the illumination device 31, the homogenizing device 32, and the color separation device 33 are the optical component casing 36. It is arranged at a position on the illumination optical axis Ax. Further, the electro-optical device 34 and the projection optical device 35 are arranged according to the illumination optical axis Ax, although they are located outside the optical component casing 36.

The lighting device 31 includes a pair of light source devices 31A and 31B that are arranged to face each other, and a reflection mirror 31C that is arranged between the pair of light source devices 31A and 31B.
Each of the pair of light source devices 31A and 31B includes a light source lamp 311 and a reflector 312, and a storage body 313 that stores these inside. Then, these light source devices 31A and 31B emit light toward the reflection mirror 31C.
The reflection mirror 31C reflects the lights incident from the light source devices 31A and 31B, respectively, in the same direction, and causes the lights to enter the homogenizing device 32.

The homogenizing device 32 homogenizes the illuminance in the plane orthogonal to the central axis of the light flux emitted from the illuminating device 31. The homogenizing device 32 includes a cinema filter 321, a first lens array 322, a UV filter 323, a second lens array 324, a polarization conversion element 325, and a superimposing lens 326.
Of these, the polarization conversion element 325 is for aligning the polarization direction of the incident light into one type.
The color separation device 33 separates the light flux incident from the homogenization device 32 into three color lights of red (R), green (G) and blue (B). The color separation device 33 includes dichroic mirrors 331 and 332, reflection mirrors 333 to 336, and relay lenses 337 to 339.

The electro-optical device 34 modulates the separated color lights in accordance with the image information, and then combines the modulated color lights. The electro-optical device 34 includes a field lens 340, a liquid crystal panel 341 as a light modulator provided for each color light (liquid crystal panels for red, green, and blue are respectively referred to as 341R, 341G, and 341B), incident side polarization. It has a plate 342 and an emission side polarization plate 343, an optical compensation plate 344, and one color synthesizing device 345. Of these, the color synthesizing device 345 corresponds to the photosynthesis device of the present invention.
The shift element 5 enhances the resolution of the projected image by periodically shifting the optical path of the light emitted by the color synthesizing device 345.
The configurations of the electro-optical device 34 and the shift element 5 will be described in detail later.

  The projection optical device 35 is a projection lens that magnifies and projects the light flux (light flux forming an image) combined by the color combining device 345 onto the projection surface. As such a projection optical device 35, a combination lens in which a plurality of lenses are arranged in a lens barrel can be adopted.

  In the following figures and description, the Z direction indicates the traveling direction (projection direction) of the light emitted from the color synthesizing device 345, and the X direction and the Y direction are orthogonal to the Z direction and are mutually orthogonal. Indicates the direction to do. Of these, the Y direction is the direction opposite to the vertical direction when the projector 1 is arranged such that the Z direction is along the horizontal direction in plan view (that is, from the bottom surface portion 22 of the exterior housing 2). The direction toward the top surface portion 21) is shown, and the X direction is a direction from left to right when viewed from the Z direction side (light traveling direction side).

[Configuration of electro-optical device]
3 is a perspective view of the electro-optical device 34 and the cooling device 4 viewed from the X direction side, and FIG. 4 is a plan view of the electro-optical device 34 and the cooling device 4 viewed from the Y direction side. It should be noted that FIGS. 3 and 4 show the electro-optical device 34 with the field lens 340 removed.
Among the components of the electro-optical device 34, the liquid crystal panels 341 (341R, 341G, 341B), the emission side polarization plate 343, and the optical compensation plate 344 are attached to the color synthesizing device 345 by a holding member, and these are shown in FIG. And, as shown in FIG. 4, an integrated prism unit is configured.
The color synthesizing device 345 which constitutes this prism unit is constituted by a cross dichroic prism having a substantially rectangular prism shape. The color synthesizing device 345 includes six surfaces 3451 to 456. Of these, prism bases 347U and 347L (see FIGS. 3 and 11) are in contact with the surface 3451 on the Y direction side of the color synthesizing device 345 and the surface 3452 on the side opposite to the Y direction side. A color synthesizer 345 is supported.

  A surface 3453 on the X direction side, a surface 3454 on the opposite side to the X direction side, and a surface 3455 on the opposite side to the Z direction side of the color synthesizing device 345 are incident surfaces of the red, blue, and green modulated lights, respectively. And the surface 3456 on the Z direction side is the emission surface. The liquid crystal panels 341R, 341G, 341B are held by the holding members 346 (red holding members 346R, green holding members 346G, red holding members 346B) so as to face the respective incident surfaces (surfaces 3453 to 3455). Thereby, the liquid crystal panel 341, the incident side polarization plate 342, the emission side polarization plate 343, and the optical compensation plate 344 are integrated.

[Configuration of shift element]
FIG. 5 is a perspective view of the fixing member 360 and the shift element 5 as seen from the side opposite to the Z direction.
The fixing member 360 is a portion that constitutes a part of the optical component casing 36 and to which the shift element 5 is fixed. The fixing member 360 is arranged at a position facing the projection optical device 35 in the optical component casing 36. As shown in FIG. 5, the shift element 5 is fixed to the surface 3601 of the fixing member 360 on the side opposite to the Z direction. Specifically, the shift element 5 is fixed to the fixing member 360, so that the shift element 5 is fixed while being arranged between the color synthesizing device 345 and the projection optical device 35.

6 is a plan view of the shift element 5 viewed from the Z direction side, FIG. 7 is a side view of the shift element 5 viewed from the side opposite to the X direction, and FIG. 8 is a view of the shift element 5. It is an exploded perspective view.
The shift element 5 corresponds to the optical path changing element of the present invention, and changes (shifts) the optical path of light incident on the shift element 5 and emitted from the shift element 5 by swinging the shift element 5. Have a function. As shown in FIGS. 5 to 8, such a shift element 5 includes an optical member 51, a frame portion 52, a permanent magnet 53, a first frame 54, a second frame 55, and a pair of coil holding portions 56 and 57. .
Of these, the optical member 51 is formed of a light-transmitting member having a light-transmitting property, and in the present embodiment, is formed of rectangular plate-shaped glass.

[Structure of frame part]
The frame portion 52 has a function of holding the optical member 51 and the permanent magnet 53. As shown in FIG. 5, the frame portion 52 is formed in a rectangular plate shape having four corner portions CR1 to CR4. An opening 521 into which the optical member 51 is fitted is formed in a substantially central portion of the frame 52. Fitting grooves 522 and 523 into which the permanent magnets 53 are fitted are formed at positions on the Y direction side of the opening 521 of the frame 52 and on positions opposite to the Y direction. Of these fitting grooves 522 and 523, the fitting groove 522 is formed on the side opposite to the X direction from the fitting groove 523.

In addition, a positioning protrusion 524 that projects in the Z direction is formed at the edge of the fitting groove 522 of the frame portion 52 on the Y direction side and on the opposite side to the X direction, and the fitting in the frame portion 52 is performed. Positioning protrusions 525 that project in the Z direction are formed at the edges of the mating groove 523 on the side opposite to the Y direction and on the X direction side. Further, on the surface of the frame portion 52 on the side opposite to the Z direction, positioning protrusions 526 and 527 are formed at positions corresponding to these positioning protrusions 524 and 525, respectively. Has been done.
In other words, the positioning protrusions 524 and 526 on the Y direction side are formed in the vicinity of the corner portion CR3 of the four corner portions CR1 to CR4 of the frame portion 52, and the positioning protrusions 525 and 527 on the side opposite to the Y direction are formed. Is formed in the vicinity of a corner CR2 that is a diagonal of the corner CR3.
The permanent magnet 53 is formed in a prismatic shape as shown in FIG. The permanent magnet 53 (permanent magnet 531) is fitted in the fitting groove 522, and the permanent magnet 53 (permanent magnet 532) is fitted in the fitting groove 523. In this way, the permanent magnets 531 and 532 are fixed to the frame portion 52.

[Structure of the first frame]
The first frame 54 is arranged on the side opposite to the Z direction of the frame 52 and has a function of sandwiching the frame 52 together with the second frame 55. The first frame 54 is formed in a rectangular plate shape, and an opening 541 is formed in a substantially central portion of the first frame 54. The opening 541 is formed in substantially the same shape as the optical member 51. As a result, the light incident from the opening 541 is incident on the optical member 51.
Further, a through hole 542 is formed at the end of the first frame 54 on the Y direction side and on the opposite side to the X direction, and on the opposite side to the Y direction of the first frame 54, and A through hole 543 is formed at the edge on the X direction side. The positioning protrusions 524 of the frame 52 are inserted into the through holes 542, and the positioning protrusions 525 are inserted into the through holes 543.

[Structure of second frame]
The first frame 54 is arranged on the Z direction side of the frame portion 52 and has a function of sandwiching the frame portion 52 together with the first frame 54. The second frame 55 is formed in a rectangular plate shape, and an opening 551 is formed in a substantially central portion of the second frame 55. The opening 551 is formed in substantially the same shape as the optical member 51.
Further, a through hole 552 is formed at the end of the second frame 55 on the Y direction side and on the opposite side to the X direction, and on the opposite side to the Y direction of the second frame 55, and A through hole 553 is formed at the edge on the X direction side. The positioning protrusion 526 of the frame portion 52 is inserted into the through hole 552, and the positioning protrusion 527 is inserted into the through hole 553.

Further, the second frame 55 includes extension parts 554 to 557 extending from the respective corners to the outside of the second frame 55. Through-holes 5541, 5551, 5561, 5571, through which the screws S1 are inserted, are formed in these extending portions 554 to 557, respectively. By screwing these screws S1 into the fixing member 360, the shift element 5 is fixed to the fixing member 360 as shown in FIG.
With such a configuration, the first frame 54 and the second frame 55 sandwich the frame portion 52. The frame 52, the first frame 54, and the second frame 55 correspond to the frame of the present invention.

[Configuration of coil holding part]
Each of the pair of coil holding portions 56 and the pair of coil holding portions 57 includes therein an air-core coil CL corresponding to the coil of the present invention. The air-core coil CL generates a magnetic force that displaces the permanent magnet 53 and thus the shift element 5 by supplying power to the air-core coil CL. Of these, the pair of coil holding portions 56 includes a coil holding portion 561 fixed to the first frame 54 and a coil holding portion 562 fixed to the second frame 55.
Hole portions 5611 and 5621 are formed in the coil holding portions 561 and 562, respectively. The positioning protrusion 524 of the frame 52 is fitted into the hole 5611 through the through hole 542 of the first frame 54. On the other hand, the positioning protrusion 526 of the frame 52 is fitted into the hole 5621 via the through hole 552 of the second frame 55. As a result, the coil holding portion 561 is fixed to the first frame 54 and the coil holding portion 562 is fixed to the second frame 55.

On the other hand, the pair of coil holding portions 57 includes a coil holding portion 571 fixed to the first frame 54 and a coil holding portion 572 fixed to the second frame 55. Hole portions 5711 and 5721 are formed in the coil holding portions 571 and 572, respectively. The positioning protrusion 525 of the frame 52 is fitted into the hole 5711 via the through hole 543 of the first frame 54. On the other hand, the positioning protrusion 527 of the frame 52 is fitted into the hole 5721 via the through hole 553 of the second frame 55. As a result, the coil holding portion 571 is fixed to the first frame 54 and the coil holding portion 572 is fixed to the second frame 55.
The pair of coil holding portions 56, the air-core coil CL included in the pair of coil holding portions 56, and the permanent magnet 531 correspond to one swing member of the present invention, and include the pair of coil holding portions 57 and the pair of coils. The air-core coil CL and the permanent magnet 532 included in the holding portion 57 correspond to the other swing member of the present invention.

In this way, the coil holding portion 561 and the coil holding portion 562 in the pair of coil holding portions 56 are arranged near the corner portion CR3 on the Y direction side on the opposite side to the X direction and at the overlapping position and orientation. . On the other hand, the coil holding portion 571 and the coil holding portion 572 in the pair of coil holding portions 57 are near the corner portion CR2 on the X direction side and the opposite side to the Y direction when the shift element 5 is viewed along the Z direction. And in the overlapping position and direction. In other words, when the shift element 5 fixed to the fixing member 360 is viewed from the direction opposite to the Z direction, the pair of coil holding portions 56 is arranged on the liquid crystal panel 341B side, and the pair of coil holding portions 57 is formed of the liquid crystal. It is arranged on the panel 341R side.
The frame portion 52, the first frame 54, the second frame 55, the pair of coil holding portions 56, and the pair of coil holding portions 57 are made of metal having thermal conductivity, and in the present embodiment, made of aluminum. Has been done. Thereby, when the temperature of the air-core coil CL rises, the frame portion 52, the first frame 54, the second frame 55, the pair of coil holding portions 56, and the pair of coil holding portions 57, the coil holding portions 56 and 57, respectively. The heat of the air-core coil CL is conducted to.

Further, the power supply unit 3602 attached to the fixing member 360 is connected to each of the coil holding units 561, 562, 571, 572 (see FIG. 5). The power supply unit 3602 displaces the permanent magnets 531 and 532 by supplying power to the air-core coil CL through the coil holding units 561, 562, 571 and 572, and thus displaces the shift element 5. To generate a magnetic force.
Specifically, when the permanent magnets 531 and 532 attached to the frame 52 are changed, the shift element 5 moves toward and away from the surface 3601 of the fixing member 360 along the rotation angle L1 shown in FIG. By moving to, the angle of the optical member 51 fitted in the opening 521 of the frame 52 is changed.
In other words, by supplying electric power to each of the coil holding portions 561, 562, 571, 572, it is possible to change the optical path of light that is incident on the optical member 51 and is emitted from the optical member 51.

[Cooling device configuration]
9 is a perspective view of the cooling device 4 viewed from the Y direction side, and FIG. 10 is a plan view of the cooling device 4 viewed from the Y direction side.
The cooling device 4 has a function of blowing a cooling gas to cool the liquid crystal panel 341 (341R, 341G, 341B) and the shift element 5. As shown in FIGS. 9 and 10, the cooling device 4 includes a cooling fan 41 (the cooling fans corresponding to the liquid crystal panels 341R, 341G, and 341B are cooling fans 41R, 41G, and 41B), and a duct member 42. And Of these, the cooling fan 41 sucks the cooling gas around the cooling fan 41 and supplies the cooling gas to the liquid crystal panels 341 and the shift elements 5 via the duct member 42.
The cooling fan 41 is composed of a sirocco fan. However, the present invention is not limited to this, and the cooling fan 41 may be configured by an axial fan.

[Composition of duct members]
The duct member 42 guides the cooling gas sent from each cooling fan 41 to the shift element 5 as well as the corresponding liquid crystal panel 341, the polarizing plates 342 and 343, and the optical compensation plate 344. The duct member 42 includes a first duct part 43, a second duct part 44, a third duct part 45, and a connecting part 46.

[Configuration of the first duct part]
The first duct portion 43 has a function of supplying the cooling gas from the cooling fan 41R to the liquid crystal panel 341R and the coil holding portion 57 of the shift element 5. The first duct part 43 includes a branch part 431, a delivery port 432 for sending a part of the cooling gas branched by the branch part 431 to the liquid crystal panel 341R for red, and a part of the other branched part. And a delivery port 433 for delivering the gas to the coil holding portion 57 of the shift element 5.
An end portion 434 on the X direction side of the first duct portion 43 is connected to the discharge port of the cooling fan 41R. Further, the protruding portion 435 of the first duct portion 43 has a shape extending in the Y direction, and the delivery port 432 is formed at the end portion of the protruding portion 435 on the Y direction side. A rectifying section 436 is provided at the end of the protruding section 435 on the side opposite to the Y direction. The rectifying portion 436 is formed in a substantially arc shape and has a function of allowing the cooling gas from the cooling fan 41R to smoothly flow in the Y direction.
The delivery port 432 is arranged at a position corresponding to the liquid crystal panel 341R. As a result, the cooling gas is circulated toward the liquid crystal panel 341R via the delivery port 432.

Further, the first duct part 43 has an extension part 437 extending from the branch part 431 to the Z direction side, as shown in FIGS. 9 and 10. The delivery port 433 is formed in the extending portion 437. An opening 4372 is formed on a surface 4371 of the extending portion 437 on the side opposite to the Z direction. A part of the cooling gas supplied from the cooling fan 41R flows through the opening 4372. That is, the branch portion 431 is configured by the surface 4371 and the opening portion 4372.
The delivery port 433 corresponds to the delivery port of the present invention, and is arranged at a position facing the coil holding portion 57 of the shift element 5.

[Configuration of the second duct part]
The second duct portion 44 has a function of supplying the cooling gas from the cooling fan 41G to the liquid crystal panel 341G. The second duct portion 44 has a delivery port 442 for delivering the cooling gas to the liquid crystal panel 341G for green.
An end portion 444 of the second duct portion 44 on the side opposite to the Z direction is connected to the discharge port of the cooling fan 41G. The delivery port 442 is formed in the projecting portion 445 of the second duct portion 44. A rectifying section 446 is provided at the end of the projecting section 445 opposite to the Y direction. The rectifying portion 446 is formed in a substantially arc shape and has a function of allowing the cooling gas from the cooling fan 41G to smoothly flow in the Y direction.
The delivery port 442 is arranged at a position corresponding to the liquid crystal panel 341G. As a result, the cooling gas is circulated toward the liquid crystal panel 341G via the outlet 442.

[Structure of third duct part]
The third duct portion 45 has a function of supplying the cooling gas from the cooling fan 41B to the liquid crystal panel 341B and the coil holding portion 56 of the shift element 5. The third duct part 45 includes a branch part 451, a delivery port 452 for sending a part of the cooling gas branched by the branch part 451 to the liquid crystal panel 341B for blue, and a part of the other branched part. And a delivery port 453 for delivering the gas to the coil holding portion 56 of the shift element 5.
The end portion 454 of the third duct portion 45 on the side opposite to the Z direction is connected to the discharge port of the cooling fan 41B. Further, the protruding portion 455 of the third duct portion 45 has a shape extending in the Y direction, and the delivery port 452 is formed at the end portion of the protruding portion 455 on the Y direction side. A rectifying unit 456 is provided at the end of the protruding portion 455 on the side opposite to the Y direction. The rectifying portion 456 is formed in a substantially arc shape and has a function of allowing the cooling gas from the cooling fan 41B to smoothly flow in the Y direction.
The delivery port 452 is arranged at a position corresponding to the liquid crystal panel 341B. As a result, the cooling gas is circulated toward the liquid crystal panel 341B via the outlet 452.

Further, the third duct part 45 has an extension part 457 extending from the branch part 451 to the Z direction side, as shown in FIGS. 9 and 10. The delivery port 453 is formed in the extending portion 457. An opening 4572 is formed on a surface 4571 of the extending portion 457 on the side opposite to the Z direction. A part of the cooling gas supplied from the cooling fan 41B flows through the opening 4572. That is, the branch portion 451 is composed of the surface 4571 and the opening 4572.
The delivery port 453 corresponds to the delivery port of the present invention, and is arranged at a position facing the coil holding portion 56 of the shift element 5.

[Cooling gas flow direction]
11 is a cross-sectional view showing a cross section of the electro-optical device 34 and the cooling device 4 taken along broken line A1-A1 shown in FIG. 4, and FIG. 12 shows the electro-optical device 34 and the cooling device 4 in FIG. It is sectional drawing which shows the cross section cut | disconnected by the broken line B1-B1.
As shown in FIGS. 11 and 12, the cooling gas sent from the cooling fan 41G is sent from the sending port 442 in the Y direction through the second duct portion 44, and is supplied to the liquid crystal panel 341G.

The cooling gas delivered from the cooling fan 41R is introduced into the first duct portion 43, as shown in FIG. Of this cooling gas, a part of the cooling gas branched at the branch portion 431 is sent out from the outlet 432 in the Y direction and supplied to the liquid crystal panel 341R. On the other hand, the other part of the cooling gas branched by the branching part 431 flows into the extending part 437, and is sent out in the Y direction from the delivery port 433 formed in the extending part 437, thereby shifting the shift element. 5 is supplied to the region on the X direction side.
Here, as shown in FIG. 11, a rectifying section 4373 that is inclined in the Z direction is formed at the end of the extending section 437 on the Z direction side. For this reason, when the cooling gas flowing through the extending portion 437 is sent from the sending port 433, it is spread and sent to the Z direction side. Specifically, the cooling gas delivered from the delivery port 433 is circulated to the surface of the shift element 5 on the Z direction side and the surface on the opposite side to the Z direction. More specifically, the cooling gas delivered from the delivery port 433 is circulated to the surface of the coil holding portion 571 on the side opposite to the Z direction and the surface of the coil holding portion 572 on the Z direction side.

The cooling gas sent from the cooling fan 41B is introduced into the third duct part 45, as shown in FIG. Of this cooling gas, a part of the cooling gas branched at the branching portion 451 is delivered from the delivery port 452 in the Y direction and supplied to the liquid crystal panel 341B. On the other hand, the other part of the cooling gas branched by the branching portion 451 flows into the extending portion 457, is discharged from the outlet 453 formed in the extending portion 457 in the Y direction, and is a shift element. 5 is supplied to the region on the X direction side.
Here, as shown in FIG. 12, a rectifying portion 4573 that is inclined in the Z direction is formed at the end of the extending portion 457 on the Z direction side. Therefore, when the cooling gas flowing through the extending portion 457 is sent out from the sending port 453, it is spread and sent to the Z direction side. Specifically, the cooling gas delivered from the delivery port 453 is circulated to the surface of the shift element 5 on the Z direction side and the surface on the opposite side to the Z direction. More specifically, the cooling gas delivered from the delivery port 453 is circulated to the surface of the coil holding portion 571 on the side opposite to the Z direction and the surface of the coil holding portion 572 on the Z direction side.

  In this way, the cooling gas that has circulated in the region on the X direction side of the shift element 5 and the region on the opposite side to the X direction side circulates along the coil holding portions 56 and 57, respectively, thereby holding these coils. In addition to cooling the parts 56 and 57 (particularly the air-core coil CL), the permanent magnet 53 sandwiched by the coil holding parts 56 and 57 is cooled. In this way, the shift element 5 is cooled and the drive of the shift element 5 is stabilized.

[Effects of First Embodiment]
The projector 1 according to the present embodiment described above has the following effects.
Since the cooling gas can be supplied to the plurality of liquid crystal panels 341 and the shift elements 5 to be cooled, it is possible to suppress the temperature of the liquid crystal panel 341 from rising. Further, since the shift device 5 is cooled by the cooling device 4, it is possible to prevent the temperature of the shift device 5 from rising due to the light incident from the liquid crystal panel 341.

  Since the shift element 5 is arranged between the color synthesizing device 345 and the projection optical device 35, when the shift element 5 is cooled, the color synthesizing device 345 can be cooled together with the shift element 5. Therefore, it is possible to prevent the temperature of the shift element 5 from rising due to the light incident from the color synthesizing device 345.

  Since the duct member 42 for circulating the cooling gas through the liquid crystal panel 341 has the outlets 433, 453, it is not necessary to separately provide a cooling device for cooling the shift element 5. According to this, the cooling device 4 can be downsized, and in turn, the projector 1 can be downsized.

Here, when electric power is supplied to the pair of air-core coils CL arranged with the permanent magnet 53 sandwiched therebetween, the permanent magnet 53 is displaced, and thus, the magnetic force for displacing the shift element 5 is generated and the air-core coil CL is generated. The temperature of the coil CL rises. Thus, when the temperature of the air-core coil CL rises, the magnetic force of the air-core coil CL that generates magnetic force may weaken.
On the other hand, according to the present embodiment, since the cooling gas is supplied to the shift element 5, it is possible to suppress an increase in the temperature of the shift element 5, that is, the temperature of the pair of air-core coils CL included in the shift element 5. Therefore, the decrease in the magnetic force of the air-core coil CL provided in the shift element 5 can be suppressed, so that the driving of the shift element 5 can be stabilized.

  The air-core coil CL is fixed to the first frame 54 and the second frame 55 forming the holding portion of the shift element 5 by the pair of coil holding portions 56 and the pair of coil holding portions 57, and the coil holding portion is fixed. At least a part of the cooling gas flows through 56 and 57, so that the coil holding portions 56 and 57 can be reliably cooled. Therefore, by cooling the coil holding portions 56 and 57, it is possible to cool the air-core coil CL held by the coil holding portions 56 and 57 and suppress an increase in the temperature of the air-core coil CL.

  Cooling gas can be supplied to the liquid crystal panels 341R and 341B and the shift element 5 through the two duct portions 43 and 45 corresponding to the liquid crystal panels 341R and 341B arranged on opposite sides of the color synthesizing device 345. That is, since the cooling gas is supplied to the shift element 5 from the two outlets 433 and 453, the shift element 5 can be reliably cooled. Further, since the cooling gas can be supplied to the liquid crystal panel 341 and the shift element 5 without further providing a duct for circulating the cooling gas in the shift element 5, the cooling device 4 can be downsized, and the projector 1 can be downsized.

  Air core coil CL that constitutes one swing member, the pair of coil holding portions 56 and permanent magnet 531 and one liquid crystal panel 341B are close to each other, and the air core coil CL that constitutes the other swing member, pair The positions of the coil holding portion 57 and the permanent magnet 532 and the other liquid crystal panel 341R are close to each other. Therefore, since the liquid crystal panels 341R and 341B arranged facing each other are close to the positions of the respective swing members, the duct portions 43 and 45 corresponding to the liquid crystal panels 341R and 341B arranged close to each other are removed. The configuration of the branch portions 431 and 451 that allow the cooling gas to flow through the swing member can be simplified. Further, since the distance from the branch portions 431, 451 of the duct portions 43, 45 to the outlets 433, 453 can be shortened, it is possible to suppress a decrease in the flow rate of the cooling gas flowing through the duct portions 43, 45. Therefore, the shift element 5 can be cooled more reliably.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration as the projector 1, but differs from the projector 1 in that the shape of the shift element forming the electro-optical device is different. In the following description, the same or substantially the same parts as those already described are designated by the same reference numerals and the description thereof will be omitted.

FIG. 13 is a perspective view showing the shift element 5A of the projector according to the present embodiment.
The shift element 5A corresponds to the optical path changing element of the present invention and has a function of changing the optical path of incident light. As shown in FIG. 13, such a shift element 5A includes an optical member 51, a frame portion 52, a permanent magnet (not shown), a first frame 54, a second frame 55, a pair of coil holding portions 56A, and a pair of coils. A holding unit 57 is provided. In this embodiment, only the configuration of the coil holding portion 56A is different, and therefore only the coil holding portion 56A will be described below in detail.

Similar to the coil holding portion 56, the pair of coil holding portions 56A have an air-core coil CL inside and are made of aluminum having thermal conductivity. Further, of the pair of coil holding portions 56A, the coil holding portion 561A on the side opposite to the Z direction is configured in a substantially L shape as shown in FIG. Specifically, the coil holding portion 561A extends along the side edge of the first frame 54 on the side opposite to the X direction to the outlet 453 side, that is, the side opposite to the Y direction. It is equipped with 56A1. With this configuration, the heat radiation area of the coil holding portion 561A is larger than that of the other coil holding portions 562, 571, 572.
When the cooling gas is delivered from the delivery port 453 to the coil holding portion 561A, the cooling gas flows along the surface of the extension portion 56A1 of the coil holding portion 561A opposite to the Z direction. Then, the coil holding portion 561A is cooled.

[Effects of Second Embodiment]
The projector according to the present embodiment described above has the following effects in addition to the same effects as the projector 1.
The distance from the delivery port 453 to the coil holding portion 56 is larger than the distance from the delivery port 433 to the coil holding portion 57. Further, there is a possibility that a part of the cooling gas that has cooled the coil holding portion 57 and has increased in temperature may flow to the coil holding portion 56. As a result, it is assumed that the cooling efficiency of the coil holder 56 is lower than the cooling efficiency of the coil holder 57.
Here, since the coil holding portion 561A has the extension portion 56A1, the heat radiation area of the coil holding portion 561A provided with the extension portion 56A1 is larger than the heat radiation area of the coil holding portion 561 not having the extension portion 56A1. growing. According to this, since the cooling gas is supplied to the coil holding part 561A (extension part 56A1), the coil holding part 561A can be cooled more reliably. Therefore, it is possible to reliably cool the air-core coil CL held by the coil holding portion 561A and prevent the temperature of the air-core coil CL from rising.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration as the projector 1, but differs from the projector 1 in that the shape of the shift element forming the electro-optical device is different. In the following description, the same or substantially the same parts as those already described are designated by the same reference numerals and the description thereof will be omitted.

FIG. 14 is a perspective view showing the shift element 5B of the projector according to the present embodiment.
The shift element 5B corresponds to the optical path changing element of the present invention and has a function of changing the optical path of incident light. As shown in FIG. 14, such a shift element 5B includes an optical member 51, a frame portion 52, a permanent magnet (not shown), a first frame 54, a second frame 55, a pair of coil holding portions 56B, and a pair of coils. A holding portion 57B is provided. In the present embodiment, only the configurations of the coil holding portions 56B and 57B are different, and therefore only the coil holding portions 56B and 57B will be described below in detail.

Similar to the coil holding portion 56, the pair of coil holding portions 56B and the pair of coil holding portions 57B have air core coils CL inside and are made of aluminum having thermal conductivity. Further, each of the coil holding portions 561A and 561B includes a plurality of rectangular plate-shaped fins 56B1 corresponding to the heat radiation portion of the present invention. On the other hand, each of the coil holding portions 571B and 572B also includes a plurality of rectangular plate-shaped fins 57B1. With this configuration, the heat radiation area of the pair of coil holding portions 56B and 57B is larger than the heat radiation area of the pair of coil holding portions 56 and 57 according to the first embodiment.
When the cooling gas is delivered from the outlets 433, 453 to the pair of coil holding portions 56B, 57B, the cooling gas is passed between the plurality of fins 56B1, 57B1 of the pair of coil holding portions 56B, 57B. Is circulated, and the pair of coil holding portions 56B and 57B are cooled.

[Effects of Third Embodiment]
The projector according to the present embodiment described above has the following effects in addition to the same effects as the projector 1.
Since the pair of coil holding portions 56B and the pair of coil holding portions 57B have fins 56B1 and 57B1 as heat radiation portions, the heat radiation amount of the pair of coil holding portions 56B and the pair of coil holding portions 57B is the same as that of the fins 56B1 and 57B1. It becomes larger than the heat radiation amount of the coil holding portions 56 and 57 which are not performed. According to this, by supplying the cooling gas to the fins 56B1 and 57B1 of the pair of coil holding portions 56B and the pair of coil holding portions 57B, the pair of coil holding portions 56B and the pair of coil holding portions 57B can be more reliably removed. Can be cooled. Therefore, it is possible to reliably cool the air-core coil CL held by the pair of coil holding portions 56B and the pair of coil holding portions 57B, and prevent the temperature of the air-core coil CL from rising.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiments, and modifications, improvements, etc. within the scope of achieving the object of the present invention are included in the present invention.
In each of the above-described embodiments, the cooling device 4 includes the cooling fans 41R, 41G, and 41B connected to the first to third duct portions 43 to 45, respectively. However, the present invention is not limited to this. For example, the number of cooling fans 41 may be one or two. In this case, if the cooling gas is supplied to the first to third duct parts 43 to 45, the first to third duct parts 43 to 45 may have any shape.

In each of the above-described embodiments, the shift element 5 includes the optical member 51, the frame portion 52, the permanent magnet 53, the first frame 54, the second frame 55, and the pair of coil holding portions 56 and 57. However, the present invention is not limited to this. For example, the first frame 54 and the second frame 55 may be integrated. Further, although the pair of coil holding portions 56 and the pair of coil holding portions 57 are provided, only one of them may be provided.
That is, if the air-core coil CL held by the coil holding portions 56 and 57 is supplied with electric power, the shift element 5 swings, and the optical path of the light incident on the optical member 51 can be changed, what kind of configuration will be used? It may be.

In each of the above embodiments, the air-core coil CL is held by the coil holding portions 56 and 57. However, the present invention is not limited to this. For example, the air core coil CL may be directly fixed to the first frame 54 and the second frame 55.
In each of the above embodiments, the color synthesizing device 345 is configured by a cross dichroic prism. However, the present invention is not limited to this. For example, the color synthesizing device 345 may have any shape as long as it can synthesize the light incident from the liquid crystal panel 341.

  In each of the above-described embodiments, the pair of coil holding portions 56 is located in the vicinity of the corner portion CR3 of the first frame 54, that is, on the side opposite to the X direction when the shift element 5 is viewed from the side opposite to the Z direction. The pair of coil holding portions 57 are arranged at positions on the Y direction side, and are arranged near the corner portion CR2 of the first frame 54, that is, at positions on the X direction side and on the opposite side to the Y direction. . However, the present invention is not limited to this. For example, the positions of the pair of coil holding portions 56 and the pair of coil holding portions 57 may be reversed. Even in this case, the same effects as those of the shift elements 5, 5A, 5B of the above-described respective embodiments can be obtained.

  In each of the above embodiments, the branch parts 431 and 451 are provided only in the first duct part 43 and the third duct part 45. However, the present invention is not limited to this. For example, a branch portion may be provided in the second duct portion 44, and the cooling gas may be supplied to the shift element 5 from the branch portion. In this case, the prism base 347L for fixing the color synthesizing device 345 may not be provided, and the connecting portion 46 may be replaced by an outlet. According to this, since the cooling gas branched from the cooling gas flowing through each of the first to third duct portions 43 to 45 is supplied to substantially the entire region of the shift element 5, the shift element 5 is cooled more reliably. it can.

  In each of the above embodiments, the pair of coil holding portions 56, 57, 56A, 56B, 57B holds the air-core coil CL. However, the present invention is not limited to this. For example, the pair of coil holding portions 56, 57, 56A, 56B, 57B may hold the iron core coil. That is, the coil may have any shape and type as long as it can generate a magnetic force by supplying electric power.

  In each of the above embodiments, the frame portion 52, the first frame 54, the second frame 55, and the pair of coil holding portions 56, 57, 56A, 56B, 57B are made of aluminum. However, the present invention is not limited to this. For example, the frame portion 52, the first frame 54, the second frame 55, and the pair of coil holding portions 56, 57, 56A, 56B, 57B are not limited to aluminum, but may be any as long as they have thermal conductivity. It may be made of a material.

  In each of the above-described embodiments, the rectifying portions 436, 446, 456 are provided at the ends of the protrusions 435, 445, 455 on the side opposite to the Y direction. However, the present invention is not limited to this. For example, the rectifying portions 436, 446, 456 may be the inner surface of the exterior housing 2. In this case, the duct member 42 is attached to the inner surface to form each duct portion. Become.

  In the second embodiment, the coil holding part 561A is provided with the extending part 56A1. However, the present invention is not limited to this. For example, the coil holding part 562 may also have an extension part like the coil holding part 561A. Further, the coil holding portions 571 and 572 may also be provided with extending portions in the same manner. In addition, each of the coil holding portions 561A, 562, 571, 572 provided with these extending portions may be further provided with the fins 56B1, 57B1 according to the third embodiment.

In the third embodiment, each of the pair of coil holding portions 56B and 57B has a heat sink shape including the fins 56B1 and 57B1. However, the present invention is not limited to this. For example, the fins 56B1 and 57B1 may be provided only on the coil holding portions 561B and 571B attached to the first frame 54, or the fins 56B1 and 57B1 may be provided only to the coil holding portions 562B and 572B attached to the second frame 55. It may be provided. That is, the fins 56B1 and 56B2 may be provided on any of the coil holding portions 561B, 562B, 571B, and 572B.
Further, the fins 56B1 and 57B1 are not limited to the rectangular plate shape, and may have any shape, and the fins having different shapes are provided for each of the coil holding portions 561B, 562B, 571B, and 572B. Good. In short, the heat radiation area of the coil holding portions 561B, 562B, 571B, 572B may be increased.

  In the above embodiment, the transmissive liquid crystal panel 341 (341R, 341G, 341B) is used as the light modulator. However, the present invention is not limited to this. For example, a reflective liquid crystal panel may be used instead of the transmissive liquid crystal panel 341 (341R, 341G, 341B). In this case, the color separating device 33 may not be provided, and the color combining device 345 may perform the color separation and the color combination.

In the above-described embodiment, the projector 1 includes the three liquid crystal panels 341 (341R, 341G, 341B), but the present invention is not limited to this. That is, the present invention can be applied to a projector using two or less liquid crystal panels or four or more liquid crystal panels.
Further, a DMD (Digital Micromirror Device) or the like may be used instead of the liquid crystal panel.

In the above-described embodiment, the projector 1 includes the pair of light source devices 31A and 31B. However, the present invention is not limited to this. For example, the number of light source devices may be one or four.
In the above embodiment, the image forming apparatus 3 is arranged as shown in FIG. However, the present invention is not limited to this. For example, the image forming apparatus may be arranged in a substantially L shape or a substantially U shape.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 31 ... Illumination device (light source), 341, 341R, 341B, 341B ... Liquid crystal panel (light modulation device), 345 ... Color synthesizing device (light synthesizing device), 3453, 3454, 3455 ... Surface (incident surface), 3456 ... Surface (emission surface), 35 ... Projection optical device, 4 ... Cooling device, 41, 41B, 41G, 41R ... Cooling fan, 42 ... Duct member, 43 ... First duct part (duct), 431, 451 ... Branch Part, 433, 453 ... Outlet port, 44 ... Second duct part (duct), 45 ... Third duct part (duct), 4371, 4571 ... Surface (branch part), 4372, 4572 ... Opening part (branch part), 5, 5A, 5B ... Shift element, 51 ... Optical member, 52 ... Frame part (holding part), 53, 531, 532 ... Permanent magnet (pivoting member), 54 ... First frame (holding part), 55 ... Second F Frames (holding parts) 56, 57, 56A, 56B ... A pair of coil holding parts (swing members), 561, 562, 571, 572, 561A, 561B, 562B, 571B, 572B ... Coil holding parts, 56A1 ... Parts, 56B1, 57B1 ... Fins (heat dissipation part), CL ... Air core coils (a pair of coils, swing members).

Claims (12)

A light source,
A light modulator for modulating the light emitted from the light source,
A projection optical device for projecting light modulated by the light modulator,
An optical path changing element that is disposed between the light modulation device and the projection optical device, receives light modulated by the light modulation device, and changes an optical path of the incident light .
A cooling device that cools the optical modulator and the optical path changing element ,
The optical path changing element,
Frame and
An optical member that is held by the frame and changes the optical path of incident light,
A swinging unit that swings the optical member,
The swinging part is
A coil, a permanent magnet, and a coil holding portion that holds the coil,
By supplying power to the coil, the optical member is swung,
The cooling device is
A cooling fan that sends out a cooling gas,
A duct member for circulating the cooling gas sent from the cooling fan,
The duct member has a delivery port for circulating the cooling gas toward the optical path changing element,
The projector is characterized in that the delivery port is arranged at a position facing the coil holding portion . The projector according to claim 1,
A plurality of the light modulators,
A light synthesizing device for synthesizing and emitting the lights modulated by the plurality of light modulating devices,
The projection optical device projects the light emitted from the photosynthesis device,
The projector, wherein the optical path changing element is arranged between the photosynthesis device and the projection optical device.   The projector according to any one of claims 1 and 2,
  The coil holding portion is fixed to the frame,
  A projector is characterized in that a hole is formed in the coil holding portion, and a protrusion provided on the frame is fitted in the hole. The projector according to any one of claims 1 to 3,
  The projector according to claim 1, wherein the duct member has a branch portion that branches the cooling gas from the cooling fan into a cooling gas that flows into the light modulation device and a cooling gas that flows into the outlet.   The projector according to any one of claims 1 to 4,
  The projector is characterized in that the delivery port allows the cooling gas to flow through both the light incident side and the light emitting side of the optical path changing element. The projector according to any one of claims 1 to 5,
The coil holding unit includes a heat dissipation unit. The projector according to any one of claims 1 to 6,
The projector is characterized in that the coil holding part has an extending part extending toward the delivery port side. The projector according to claim 2 ,
The photosynthesis device,
Three incident surfaces on which light is incident via the plurality of light modulators;
One exit surface from which the combined light enters from the three entrance surfaces,
The duct member is provided corresponding to each of the plurality of light modulators, and has a plurality of ducts for delivering the cooling gas flowing through the inside to the corresponding light modulators,
Among the plurality of ducts, the ducts corresponding to the optical modulators arranged on opposite sides of the photosynthesis device sandwich the cooling gas flowing inside, and send the cooling gas from the outlet. A projector having a branch portion. The projector according to claim 8 ,
The optical path changing element has two swing parts ,
Of the light modulators arranged on opposite sides of the photosynthesis device,
One of the to one of the optical modulator device side oscillating portion is disposed, said oscillating unit other the other light modulating apparatus is arranged,
One of the oscillating member, the viewed from the incident direction side of light with respect to the optical member, a projector, characterized in that disposed on the opposite side of a position of the other of the oscillating member across the optical member. The projector according to any one of claims 1 to 9,
  It has an optical component housing,
  The optical modulator and the optical path changing element are arranged inside the optical component casing,
  The projector, wherein the optical path changing element is fixed to the optical component casing via a fixing member inside the optical component casing. The projector according to claim 10,
  A power supply unit for supplying power to the coil,
  The projector, wherein the power supply unit is provided on the fixing member.   The projector according to any one of claims 1 to 11,
  The projector is characterized in that the coil holding portion is made of metal.

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