JP2007256500A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of restraining deterioration by heat, by effectively cooling a light modulating element. <P>SOLUTION: A light modulating element holder 422 comprises a pair of plate-like parts 422R and 422L forming first spaces A11 and A12 on the luminous flux incident side and luminous flux emission side of a liquid crystal panel 421. The cooling unit 7 includes a discharge side duct 73 along which a cooling air G discharged by a cooling fan is guided to a place near a light modulating device 42G. The discharge side duct 73 circulates the cooling air G within its inside along the light modulating face of the light modulating device 42, and then causes cooling air currents G1, G2, and G3 to flow out in directions almost perpendicular to the circulating direction and sends them toward the light modulating device 42G. The projector has rectifying members 611 devised such that, of the cooling air currents G1, G2 and G3 sent from the discharge side duct 73, the cooling air currents G2 and G3 which have deviated from the first spaces A11 and A12 are circulated in second spaces A2 between the pairs of plate parts 422R and 422L and the corresponding rectifying faces 612. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, there has been known a projector including a light modulation element that modulates a light beam emitted from a light source according to image information to form an optical image, and a projection optical device that magnifies and projects the modulated light beam.
Among these, the light modulation element absorbs a part of the light beam when modulating the light beam emitted from the light source. When the light modulation element absorbs a part of the light beam, the temperature of the light modulation element itself increases. In such a state, the light modulation element may be thermally deteriorated.
For this reason, a projector having such a light modulation element inside has been proposed to have a cooling device in order to mitigate the temperature rise of the light modulation element (see, for example, Patent Document 1).

  The cooling device described in Patent Document 1 includes a cooling fan that sucks and discharges cooling air, and a discharge-side duct that guides the cooling air discharged by the cooling fan to a position near the light modulation element. . Here, the discharge side duct has an inflow port through which the cooling air discharged by the cooling fan flows into the inside, and the cooling air flows out in a direction substantially perpendicular to the flow direction of the cooling air flowing through the inside into the light modulation element. After having the outflow port which ventilates cooling air and distribute | circulating cooling air to the direction along the light modulation surface of a light modulation element, cooling air is ventilated to a light modulation element through an outflow port. In addition, the holding frame that holds the light modulation element is attached with a heat radiating member in which a pair of extending portions extending toward the light beam emission side is formed, and the light emission side of the light modulation element by the pair of extension portions A space that allows air to flow therethrough is formed. And by the structure mentioned above, the cooling air is blown over the entire surface of the light modulation element by blowing the cooling air from the discharge side duct toward the light modulation element and circulating the cooling air in the space. Cools uniformly.

JP 2005-338236 A

By the way, in Patent Document 1, since the holding frame and the heat radiating member are made of a heat conductive material, the heat generated in the light modulation element is radiated through the heat transfer path of the light modulation element, the holding frame, and the heat radiating member. Is done. That is, the temperature of the heat radiating member is likely to rise due to the heat transmitted from the light modulation element. For this reason, unless the temperature of the heat radiating member is reduced to improve the heat transfer characteristics that follow the heat transfer path of the light modulation element, the holding frame, and the heat radiating member, the heat resistance in the heat transfer path increases, and the light modulation element Can not be cooled effectively.
However, in Patent Document 1, among the cooling air blown from the discharge side duct toward the light modulation element, the cooling air flowing through the space is blown to the inner surfaces of the pair of extending portions of the heat radiating member facing each other. However, since the cooling air outside the space does not circulate along the outer surfaces of the pair of extending portions, it is difficult to reduce the temperature of the heat dissipation member satisfactorily. That is, there is a problem that the light modulation element cannot be effectively cooled.

  The objective of this invention is providing the projector which can cool a light modulation element effectively and can suppress thermal degradation.

  The projector of the present invention includes a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, a projection optical device that enlarges and projects the light beam modulated by the light modulation device, And a cooling device that blows cooling air toward the light modulation device to cool the light modulation device. The light modulation device modulates a light beam emitted from the light source according to image information. And a light modulation element holding body that holds the light modulation element, the light modulation element holding body is made of a heat conductive material and is connected to the light modulation element so that heat can be transferred, A pair of side end portions that intersect a plane parallel to the light modulation surface of the light modulation element and face each other are covered in a plane, and air is circulated on at least one of the light beam incident side and the light beam emission side of the light modulation element. The cooling device includes a cooling fan that sucks and discharges the cooling air, and the cooling air discharged by the cooling fan. A discharge side duct that leads to a position in the vicinity of the light modulation device, and the discharge side duct flows cooling air discharged by the cooling fan into the inside, and the light of the light modulation device inside After circulating the cooling air in the direction along the modulation surface, the cooling air flows out in a direction substantially orthogonal to the flow direction of the cooling air inside and blown toward the light modulation device. A second space that has each rectifying surface facing each end surface opposite to each end surface facing each other, and that allows air to flow between the pair of plate-like portions and each rectifying surface; Formed and blown from the discharge side duct The cooling air out of the first space of the cooling air, characterized in that it comprises a rectifying member for circulating the second space.

Here, the direction along the light modulation surface of the light modulation element means a direction along a plane perpendicular to the optical axis of the light beam emitted from the light source device and incident on the light modulation element.
In the present invention, since the light modulation element holding member is configured to include a pair of plate-like portions, the light modulation element and the pair of plates are provided on at least one of the light beam incident side and the light beam emission side of the light modulation element. A first space surrounded by the shape portion is formed, and air can be circulated through the first space. In addition, the discharge side duct constituting the cooling device circulates the cooling air in the direction along the light modulation surface of the light modulation element inside, and then circulates the cooling air in a direction substantially orthogonal to the flow direction of the cooling air inside. It flows out and blows toward the light modulation device. For this reason, the cooling air blown from the discharge side duct is in the flow direction with respect to the direction orthogonal to the flow direction of the cooling air flowing through the discharge side duct in a plane including the light modulation surface of the light modulation element. It will be distributed with an inclination. Of the cooling air blown from the discharge duct, the cooling air introduced into the first space is, for example, when the cooling air flows from the lower side to the upper side of the light modulation device. It circulates with the inclination which goes to the upper corner part which becomes the diagonal position of this corner part from the lower corner part. Therefore, in the first space, the cooling air can be blown over the entire light modulation surface of the light modulation element, and the light modulation element can be uniformly cooled.

In addition, the pair of plate-like parts are made of a heat conductive material and are connected to the light modulation element so as to be able to transfer heat, so that heat generated in the light modulation element can be transferred to the pair of plate-like parts. .
Further, since the projector includes the rectifying member, a second space is formed between the pair of plate-like portions and the rectifying surfaces of the rectifying member, and air can be circulated through the second space. . And a rectification | straightening member introduce | transduces into the 2nd space the cooling air which remove | deviated from 1st space among the cooling air ventilated from the discharge side duct. That is, while the cooling air which distribute | circulates 1st space along each mutually opposing end surface of a pair of plate-shaped part is ventilated, along each end surface on the opposite side to the said each end surface of a pair of plate-shaped part The cooling air flowing through the second space is blown. For this reason, the temperature of a pair of plate-shaped part can be reduced effectively, the thermal resistance in the heat transfer path | route of a light modulation element-a pair of plate-shaped part can be made small, and a light modulation element can be cooled effectively.
Therefore, in addition to forced air cooling by the cooling device, the light modulation element is effectively cooled by heat conduction from the light modulation element to the pair of plate-like portions, and thermal deterioration of the light modulation element can be suppressed.

In the projector according to the aspect of the invention, the discharge-side duct may be configured such that the end position of the end portion in the flow direction of the cooling air flowing through the discharge side duct is more than the arrangement position of the plate-like portion on the downstream side in the flow direction in the pair of plate-like portions. The cooling duct is arranged on the upstream side in the flow direction in a plan view, and the discharge side duct causes cooling air flowing through the discharge side duct to flow out toward the first space on an outer peripheral surface along the flow direction. And a second outflow port for allowing cooling air flowing through the discharge side duct to flow out is formed at an end of the flow direction end portion, and the second outflow port is formed at the end of the flow direction end portion. An air guide portion is provided for guiding the cooling air flowing out through the outlet of the second space to the second space between the plate-like portion on the downstream side in the flow direction and the rectifying surface on the downstream side in the flow direction. Preferably it is.
In the present invention, the discharge-side duct has the end position of the flow direction end portion disposed on the upstream side in the flow direction in the plan view relative to the disposition position of the plate-like portion on the downstream side in the flow direction. A 1st outflow port will be arrange | positioned with respect to 1st space at the front stage side of a distribution direction. For this reason, in the 1st space introduced after passing through the 1st outflow port, in the plane containing the light modulation surface of a light modulation element, it intersects perpendicularly with the distribution direction of the cooling air which circulates inside the discharge side duct. The cooling air flowing with an inclination in the flow direction with respect to the direction can be effectively blown over the entire light modulation surface of the light modulation element, and the light modulation element is cooled more uniformly. it can.
Further, even when the discharge side duct is disposed as described above, the second outlet is formed and the wind guide portion is provided at the end of the discharge direction end portion of the discharge side duct. Therefore, the cooling air can be reliably circulated in the second space between the plate-like portion on the downstream side in the flow direction and the rectifying surface on the downstream side in the flow direction, and the temperature of the plate-like portion on the downstream side in the flow direction can be set. It can reduce effectively and can cool a light modulation element effectively.

In the projector according to the aspect of the invention, the discharge side duct may be configured such that the cooling air flowing through the inside of the discharge side duct on the outer peripheral surface along the flow direction passes the plate-like portion on the upstream side in the flow direction and the front side on the flow direction. A third outflow port is formed to flow out toward the second space between the rectifying surface, and cooling air that has flowed out through the third outflow port to the outer peripheral surface along the flow direction is formed in the flow direction. It is preferable that an auxiliary rectification unit that leads to the second space between the plate-like part on the front side and the rectification surface on the front side in the flow direction is provided.
According to the present invention, since the third outlet is formed on the outer peripheral surface of the discharge side duct and the auxiliary rectification unit is provided, the plate-like part on the upstream side in the flow direction and the rectification surface on the upstream side in the flow direction The cooling air can be reliably circulated in the second space between the two, and the temperature of the plate-like portion on the upstream side in the distribution direction can be effectively reduced, and the light modulation element can be effectively cooled.

In the projector according to the aspect of the invention, the light modulation device includes a plurality of components, and the discharge side duct includes a plurality of circulation portions that respectively guide cooling air to positions near the plurality of light modulation devices. At least one of the flow sections, after flowing the cooling air in a direction along the light modulation surface of the light modulation device corresponding to the flow section, a direction substantially orthogonal to the flow direction of the cooling air inside It is preferable that the cooling air flows out and is blown toward the light modulation device.
According to the present invention, after at least one of the plurality of flow sections constituting the discharge-side duct distributes the cooling air in a direction along the light modulation surface of the light modulation device corresponding to the flow section. Since the cooling air flows out in a direction substantially orthogonal to the flow direction and blows toward the light modulation device, each light modulation element is effectively cooled even when the light modulation device is composed of a plurality of light modulation devices. It becomes possible to do. In particular, after flowing cooling air in a direction along the light modulation surface of the light modulation element through a flow part corresponding to a light modulation element having a relatively large calorific value among a plurality of light modulation elements, the flow direction is substantially orthogonal to the flow direction. It is preferable that the cooling air flows out in a direction to flow and blows air toward the light modulation device. If comprised in this way, the light modulation element with comparatively large emitted-heat amount among each light modulation element can be cooled effectively. In addition, as a distribution unit corresponding to another light modulation element having a relatively small calorific value, a configuration similar to the above-described distribution unit may be employed, or another configuration may be employed. It is sufficient to design according to the specifications, and the degree of freedom of design is improved.

  In the projector of the present invention, the plurality of light modulation devices include a red light side light modulation device corresponding to red light having a red wavelength region, a green light side light modulation device corresponding to green light having a green wavelength region, And a blue light side light modulation device corresponding to blue light having a blue wavelength region, and having three light beam incident side end faces for attaching the three light modulation devices, respectively. A color synthesizing optical device that synthesizes the light beams modulated by the respective light modulation elements, and the plurality of circulation portions are located in the vicinity of the green light side light modulation device and the red light side light modulation device. The first circulation part that guides the cooling air to both of the neighboring positions and the second circulation part that guides the cooling air to the vicinity of the blue light side light modulator, the first circulation part circulates inside. Cooling air flow direction end side is green light side Branching into two parts, a bifurcation part and a red light side branch part, and after the green light side branch part distributes the cooling air in a direction along the light modulation surface of the green light side light modulation device, Cooling air flows out in a direction substantially orthogonal to the flow direction and blows the cooling air toward the green light side light modulation device, and the red light side branching portion and the light modulation surface of the red light side light modulation device After circulating the cooling air in a direction substantially perpendicular to the cooling air, the cooling air flows out in a direction substantially perpendicular to the flow direction of the cooling air inside and blows the cooling air toward the red light side light modulation device. 2 circulation part distribute | circulates cooling air in the direction substantially orthogonal to the distribution direction of the cooling air inside after flowing cooling air in the direction along the said light modulation surface of the said blue light side light modulation apparatus, and the said blue Cooling air is blown toward the light side light modulator. Door is preferable.

In the present invention, for example, as three light modulation devices, the heat generation amount of each light modulation element of the green light side light modulation device and the blue light side light modulation device is the heat generation amount of the light modulation element constituting the red light side light modulation device. The discharge duct is configured as described above in order to efficiently cool each light modulation element when it is larger than the above.
That is, the second flow part constituting the discharge side duct circulates the cooling air in a direction along the light modulation surface of the blue light side light modulation device, and then flows the cooling air in a direction substantially orthogonal to the flow direction. Cooling air is blown toward the blue light side light modulation device. For this reason, the light distribution element of the blue light side light modulation device that generates a relatively large amount of heat can be effectively cooled as described above by the second circulation part. Further, unlike the first circulation part, the second circulation part does not divide the cooling air inside, so that the flow rate of the cooling air blown to the blue light side light modulation device can be sufficiently secured, and the blue light The light modulation element of the side light modulation device can be effectively cooled.

  Further, the green light side branching portion of the first flow portion constituting the discharge side duct circulates cooling air in a direction along the light modulation surface of the green light side light modulation device, and then in a direction substantially orthogonal to the flow direction. The cooling air flows out and blows the cooling air toward the green light side light modulation device. For this reason, the green light side branch portion can effectively cool the light modulation element of the green light side light modulation device that generates a relatively large amount of heat as described above.

  Further, since the light modulation element of the red light side light modulation device has a smaller amount of heat generation than each light modulation element of the blue light side light modulation device and the green light side light modulation device, the red light side branch of the first distribution unit As the part, it is possible to adopt a blowing structure different from the cooling air blowing structure by the second circulation part or the green light side branching part. That is, after branching a part of the cooling air flowing through the first flow portion as the red light side branching portion and flowing the cooling air in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device, It is possible to employ a blower structure in which the cooling air flows out in a direction substantially orthogonal to the flow direction and blows the cooling air toward the red light side light modulation device. For this reason, the red light side light modulating device and the green light side light modulating device can be integrated with the red light side branching unit and the green light side branching unit that blow cooling air, respectively. Miniaturization can be achieved.

  Furthermore, since the discharge side duct is composed of two parts, the first circulation part and the second circulation part having independent flow paths as described above, according to the calorific values of the three light modulation elements, Two cooling fans constituting the apparatus may be provided. For this reason, even if it is a case where it comprises three light modulation elements, the number of the distribution parts and cooling fans which constitute a cooling device can be reduced, and the size and weight of the projector can be reduced.

  In the projector of the present invention, the plurality of light modulation devices include a red light side light modulation device corresponding to red light having a red wavelength region, a green light side light modulation device corresponding to green light having a green wavelength region, And a blue light side light modulation device corresponding to blue light having a blue wavelength region, and having three light beam incident side end faces for attaching the three light modulation devices, respectively. A color synthesizing optical device that synthesizes each light beam modulated by each light modulation element, and the plurality of flow portions include a first flow portion that guides cooling air to a position in the vicinity of the green light side light modulation device. A second circulation part that guides cooling air to both a position near the red light side light modulation device and a position near the blue light side light modulation device, and the first circulation part is arranged on the green light side. In a direction along the light modulation surface of the light modulation device After circulating the rejection air, the cooling air flows out in a direction substantially orthogonal to the cooling air flow direction inside, and the cooling air is blown toward the green light side light modulation device, and the second flow part is After the cooling air is circulated in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device and the blue light side light modulation device, the cooling air is directed in a direction substantially orthogonal to the flow direction of the cooling air inside. It is preferable that the cooling air is respectively blown out toward the red light side light modulation device and the blue light side light modulation device.

In the present invention, for example, as the three light modulation devices, the amount of heat generated by the light modulation elements that constitute the green light side light modulation device is The discharge side duct is configured as described above in order to efficiently cool each light modulation element when it is larger than the heat generation amount.
That is, the first flow part constituting the discharge side duct circulates cooling air in a direction along the light modulation surface of the green light side light modulation device, and then flows the cooling air in a direction substantially orthogonal to the flow direction. Cooling air is blown toward the green light side light modulation device. For this reason, the 1st distribution part can cool effectively the light modulation element of the green light side light modulation device with a comparatively large calorific value as mentioned above. Further, unlike the second circulation part, the first circulation part blows the cooling air only to the green light side light modulation device, so that the flow rate of the cooling air blown to the green light side light modulation device can be sufficiently secured. The light modulation element of the green light side light modulation device can be effectively cooled.

  Further, as described above, each of the light modulation elements constituting the red light side light modulation device and the blue light side light modulation device has a smaller amount of heat generation than the light modulation elements constituting the green light side light modulation device. As the second flow part constituting the side duct, a blower structure different from the cooling air blown structure by the first flow part can be adopted. For example, when the configuration in which the red light side light modulation device and the blue light side light modulation device are attached to the respective light beam incident side end faces of the color synthesis optical device is adopted, the red light side light modulation is used as the second distribution part. The cooling air is circulated in a direction substantially orthogonal to the respective light modulation surfaces of the red light side light modulation device and the blue light side light modulation device by arranging the device and the blue light side light modulation device so as to extend in a plane. Thereafter, cooling air can be blown to each light modulator. Thus, since each circulation part which blows cooling air to each of the red light side light modulation device and the blue light side light modulation device can be made common, the second circulation part can be gathered compactly and the projector can be miniaturized.

  Furthermore, since the discharge-side duct is composed of two parts, the first circulation part and the second circulation part having independent flow paths as described above, according to the heat generation amounts of the three light modulation elements, the cooling device Two cooling fans may be provided. For this reason, even if it is a case where the three light modulators are comprised, the number of the distribution parts and cooling fans which comprise a cooling device can be reduced, and size reduction and weight reduction of a projector can be achieved.

  In the projector of the present invention, the plurality of light modulation devices include a red light side light modulation device corresponding to red light having a red wavelength region, a green light side light modulation device corresponding to green light having a green wavelength region, And a blue light side light modulation device corresponding to blue light having a blue wavelength region, and having three light beam incident side end faces for attaching the three light modulation devices, respectively. A color synthesizing optical device that synthesizes each light beam modulated by each light modulation element, and the plurality of flow portions include a first flow portion that guides cooling air to a position in the vicinity of the green light side light modulation device. A second circulation part that guides cooling air to both a position near the red light side light modulation device and a position near the blue light side light modulation device, and the first circulation part is arranged on the green light side. In a direction along the light modulation surface of the light modulation device After circulating the rejection air, the cooling air flows out in a direction substantially orthogonal to the cooling air flow direction inside, and the cooling air is blown toward the green light side light modulation device, and the second flow part is The end of the cooling air flowing in the flow direction is branched into two parts, a red light side branch part and a blue light side branch part, and the red light side branch part is substantially the same as the light modulation surface of the red light side light modulation device. After the cooling air is circulated in the orthogonal direction, the cooling air flows out in a direction substantially orthogonal to the internal direction of the cooling air, and the cooling air is blown toward the red light side light modulation device. After the cooling air is circulated in the direction along the light modulation surface of the blue light side light modulation device by the light side branching portion, the cooling air flows out in a direction substantially orthogonal to the flow direction of the cooling air inside, and the blue color Cooling air toward the light-side light modulator It is preferable to wind.

In the present invention, for example, as three light modulation devices, the amount of heat generated by each light modulation element constituting the green light side light modulation device and the blue light side light modulation device is the light modulation element constituting the red light side light modulation device. The discharge side duct is configured as described above in order to efficiently cool each light modulation element when the heat generation amount is large.
That is, the first flow part constituting the discharge side duct circulates cooling air in a direction along the light modulation surface of the green light side light modulation device, and then flows the cooling air in a direction substantially orthogonal to the flow direction. Cooling air is blown toward the green light side light modulation device. For this reason, the 1st distribution part can cool effectively the light modulation element of the green light side light modulation device with a comparatively large calorific value as mentioned above. In addition, unlike the second circulation section, the first circulation section does not divide the cooling air inside, so that the flow rate of the cooling air blown to the green light side light modulation device can be sufficiently secured, and the green light The light modulation element of the side light modulation device can be effectively cooled.

  In addition, the blue light side branching portion of the second flow portion constituting the discharge side duct circulates cooling air in a direction along the light modulation surface of the blue light side light modulation device, and then in a direction substantially orthogonal to the flow direction. The cooling air flows out and blows the cooling air toward the blue light side light modulation device. For this reason, the blue light side branch portion can effectively cool the light modulation element of the blue light side light modulation device that generates a relatively large amount of heat as described above.

  Further, since the light modulation element of the red light side light modulation device has a smaller amount of heat generation than each light modulation element of the green light side light modulation device or the blue light side light modulation device, the red light side branch of the second distribution section As the part, it is possible to adopt a blowing structure different from the cooling air blowing structure by the first circulation part or the blue light side branching part. That is, after branching a part of the cooling air flowing through the second flow portion as the red light side branching portion and flowing the cooling air in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device, It is possible to employ a blower structure in which the cooling air flows out in a direction substantially orthogonal to the flow direction and blows the cooling air toward the red light side light modulation device. Therefore, the red light side light modulating device and the blue light side light modulating device can be integrated with the red light side branching portion and the blue light side branching portion that blow cooling air, respectively, and the second distribution portion can be integrated in a compact manner. Miniaturization can be achieved.

  In the projector according to the aspect of the invention, the blue light side branching portion circulates the cooling air in a direction substantially orthogonal to the light modulation surface of the blue light side light modulation device, then bends the flow direction of the cooling air, and A bent portion that circulates cooling air in a direction along the light modulation surface and bends the flow direction in the blue light side branch portion includes the plate-like portion on the upstream side in the flow direction that forms the blue light side light modulation device, and Arranged so as to be planarly positioned in the second space between the rectifying surface on the upstream side in the flow direction, and the bent portion includes the blue light side branch portion inside the outer peripheral surface along the flow direction. A third outlet is formed for flowing the cooling air flowing out toward the second space between the plate-like portion on the upstream side in the flow direction and the rectifying surface on the upstream side in the flow direction, and is formed in the flow direction. On the outer peripheral surface along the third outlet. It is preferable that the auxiliary rectifier for guiding air to the second space between the rectifying surface of the flow direction front side to the plate-like portion of the flow direction front side.

In the present invention, in the second circulation portion, the red light side branch portion causes the cooling air to flow in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device, and the blue light side branch portion is the blue light side light modulation device. After the cooling air is circulated in a direction substantially orthogonal to the light modulation surface of the blue light side light modulation device as the blue light side branching portion, in order to realize a structure that distributes the cooling air in a direction along the light modulation surface of The cooling air flow direction is bent so that the cooling air flows in the direction along the light modulation surface. Here, the blue light side branch portion is planarly formed in a second space between the plate-like portion on the upstream side in the flow direction and the rectifying surface on the upstream side in the flow direction, where the bent portion constitutes the blue light side light modulation device. It arrange | positions so that it may be located. As a result, the size of the projector can be reduced without unnecessarily increasing the structure of the second distribution section for realizing the above-described structure.
Further, even when the blue light side branching portion has the shape described above, the third outflow port is formed on the outer peripheral surface of the bent portion and the auxiliary rectifying portion is provided. Cooling air can be reliably circulated through the second space between the plate-like portion on the upstream side in the flow direction of the modulation device and the rectifying surface on the upstream side in the flow direction, and the temperature of the plate-like portion on the upstream side in the flow direction can be set. The light modulation element of the blue light side light modulation device can be effectively reduced and effectively cooled.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a plan view showing a schematic configuration of the projector 1.
The projector 1 is an optical device that modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects the image light on a projection surface such as a screen. As shown in FIG. 1, the projector 1 includes a substantially rectangular parallelepiped outer casing 2, an optical unit 3 housed in the outer casing 2, and cooling as a cooling device that cools components inside the projector 1. The unit 7 (see FIG. 5 and FIG. 6) is generally configured.
Although not shown in the drawings, the exterior housing 2 controls the projector 1 as a whole, a power supply unit that supplies power from the outside to the constituent members of the projector 1, in addition to the optical unit 3 and the cooling unit 7. A control device or the like is assumed to be arranged.

The exterior housing 2 is a synthetic resin product by injection molding or the like, and configures the upper case, the front surface, the back surface, and the side surface of the projector 1, and the bottom surface, the front surface, the back surface, and the side surface of the projector 1, respectively. It consists of a lower case. Each case is fixed to each other with a screw or the like.
The exterior casing 2 is not limited to being made of synthetic resin, but may be formed of other materials, for example, metal.

  The optical unit 3 is disposed inside the exterior housing 2 and forms an image light to be enlarged and projected. As shown in FIG. 1, the optical unit 3 includes a light source device 10, a uniform illumination optical system 20, a color separation optical system 30, a relay optical system 35, an optical device 40, and a projection optical system 50 as a projection optical device. The optical elements, the optical device 40, and the projection optical system 50 constituting the optical systems 20 to 35 are positioned and adjusted and installed in the optical component casing 60 in which the predetermined illumination optical axis A is set. Is done.

The light source device 10 illuminates the optical device 40 by emitting light beams emitted from the light source lamp 11 in a certain direction. As shown in FIG. 1, the light source device 10 includes a light source lamp 11, a main reflecting mirror 12, and a parallelizing concave lens 14. The light source device 10 is housed and arranged in the lamp housing 10B, so that the light source device 10 is set in a predetermined position with respect to the optical component housing 60 (the central axis of the light beam emitted from the light source device 10 and the optical component housing 60). (Position where the illumination optical axis A coincides).
The light beam emitted from the light source lamp 11 is emitted as focused light by the main reflecting mirror 12 with the emission direction aligned in front of the light source device 10, collimated by the collimating concave lens 14, and applied to the uniform illumination optical system 20. It is injected.
Here, as the light source lamp 11, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is frequently used. Further, the main reflecting mirror 12 is configured as an elliptical reflector in FIG. 1, but may be configured as a parabolic reflector that reflects the light beam emitted from the light source lamp 11 in a substantially parallel manner. In this case, the collimating concave lens 14 is omitted.

The uniform illumination optical system 20 is an optical system that divides the light beam emitted from the light source device 10 into a plurality of partial light beams and uniformizes the in-plane illuminance of the illumination area. The uniform illumination optical system 20 includes a first lens array 21, a second lens array 22, a polarization conversion element 23, and a superimposing lens 24.
The first lens array 21 has a function as a light beam splitting optical element that splits a light beam emitted from the light source device 10 into a plurality of partial light beams, and is arranged in a matrix in a plane orthogonal to the illumination optical axis A. A plurality of small lenses are provided.
The second lens array 22 is an optical element that condenses a plurality of partial light beams divided by the first lens array 21 described above, and is matrixed in a plane orthogonal to the illumination optical axis A, like the first lens array 21. It has the structure provided with the several small lens arranged in a shape.

The polarization conversion element 23 is a polarization conversion element that aligns the polarization direction of each partial light beam divided by the first lens array 21 with linear polarization in substantially one direction.
Although not shown, the polarization conversion element 23 has a configuration in which polarization separation films and reflection films that are inclined with respect to the illumination optical axis A are alternately arranged. The polarization separation film transmits one polarized light beam among the P-polarized light beam and S-polarized light beam included in each partial light beam, and reflects the other polarized light beam. The reflected other polarized light beam is bent by the reflection film and emitted in the emission direction of the one polarized light beam, that is, the direction along the illumination optical axis A. Any of the emitted polarized light beams is polarized and converted by a phase difference plate provided on the light beam exit surface of the polarization conversion element 23, and the polarization directions of almost all the polarized light beams are aligned. By using such a polarization conversion element 23, it is possible to align the light beam emitted from the light source lamp 11 with a polarized light beam in substantially one direction, so that the utilization factor of the light source light used in the optical device 40 is improved. Can do.

  The superimposing lens 24 condenses a plurality of partial light beams that have passed through the first lens array 21, the second lens array 22, and the polarization conversion element 23, and superimposes them on image forming areas of three liquid crystal panels (to be described later) of the optical device 40. This is an optical element.

The color separation optical system 30 includes two dichroic mirrors 31 and 32 and a reflection mirror 33, and a plurality of partial light beams emitted from the uniform illumination optical system 20 by the dichroic mirrors 31 and 32 are converted into red (R), It has a function of separating light of three colors, green (G) and blue (B).
The dichroic mirrors 31 and 32 are optical elements in which a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam in another wavelength region is formed on a substrate. And the dichroic mirror 31 arrange | positioned in the back | latter stage of an optical path is a mirror which reflects blue light and permeate | transmits other color light. Further, the dichroic mirror 32 disposed at the rear stage of the optical path is a mirror that reflects green light and transmits red light.

  The relay optical system 35 includes an incident side lens 36, a relay lens 38, and reflection mirrors 37 and 39, and guides red light transmitted through the dichroic mirrors 31 and 32 constituting the color separation optical system 30 to the optical device 40. It has a function. The reason why such a relay optical system 35 is provided in the optical path of the red light is that the length of the optical path of the red light is longer than the length of the optical path of the other color light, and thus the use of light due to light divergence or the like. This is to prevent a decrease in efficiency. In this embodiment, the length of the optical path of red light is long, and thus such a configuration is used. However, a configuration in which the length of the optical path of blue light is increased and the relay optical system 35 is used for the optical path of blue light is also considered. It is done.

  The blue light separated by the dichroic mirror 31 described above is bent by the reflection mirror 33 and then supplied to the optical device 40 via the field lens 41. Further, the green light separated by the dichroic mirror 32 is supplied to the optical device 40 through the field lens 41 as it is. Further, the red light is condensed and bent by the lenses 36 and 38 and the reflection mirrors 37 and 39 constituting the relay optical system 35 and supplied to the optical device 40 via the field lens 41. In addition, the field lens 41 provided in the optical path upstream of each color light of the optical device 40 converts each partial light beam emitted from the second lens array 22 into a light beam parallel to the principal ray of each partial light beam. Is provided.

  The optical device 40 modulates an incident light beam according to image information to form image light (color image). This optical device 40 includes three light modulation devices 42 to be illuminated (a red light side light modulation device 42R, a green light side light modulation device 42G, and a blue light side light modulation device 42B), and color synthesis. A cross dichroic prism 43 as an optical device is provided. An incident-side polarizing plate 44 is interposed between the field lens 41 and each light modulation device 42, and between each light modulation device 42 and the cross dichroic prism 43, an emission side as an emission-side polarizing element. Each of the polarizing plates 45 is interposed, and the incident-side polarizing plate 44, the light modulation device 42, and the emission-side polarizing plate 45 modulate the light of each color light incident thereon. Of these, the three light modulation devices 42, the three exit-side polarizing plates 45, and the cross dichroic prism 43 are integrated to constitute an optical device body 40A (see FIGS. 2 to 4). The detailed configuration of the optical device body 40A will be described later. In the optical device main body 40A, a configuration in which the three incident-side polarizing plates 44 in addition to the three light modulation devices 42, the three emission-side polarizing plates 45, and the cross dichroic prism 43 may be integrated.

The incident-side polarizing plate 44 receives light of each color whose polarization direction is aligned in approximately one direction by the polarization conversion element 23, and is substantially the same as the polarization direction of the light beam aligned by the polarization conversion element 23 among the incident light beams. Only polarized light in the direction is transmitted, and other light beams are absorbed. The incident-side polarizing plate 44 has a configuration in which a polarizing film is pasted on a translucent substrate such as sapphire glass or quartz.
A liquid crystal panel 421 as a light modulation element constituting the light modulation device 42 has a configuration in which a liquid crystal (not shown) as an electro-optical material is hermetically sealed between a pair of transparent glass substrates 4211 and 4212 (FIG. 3, 4), the alignment state of the liquid crystal is controlled in accordance with the drive signal from the control device, and the polarization direction of the polarized light beam emitted from the incident side polarizing plate 44 is modulated.

The exit-side polarizing plate 45 has the same configuration as that of the incident-side polarizing plate 44, and has a polarization direction orthogonal to the transmission axis of the light beam in the incident-side polarizing plate 44 among the light beams emitted from the light modulation device 42. Only transmits light and absorbs other light fluxes. The exit side polarizing plate 45 is attached to the light incident side end surface of the cross dichroic prism 43 with an adhesive, a double-sided tape or the like (see FIGS. 2 to 4).
The cross dichroic prism 43 is an optical element that forms image light (color image) by combining modulated light modulated for each color light emitted from the emission-side polarizing plate 45. The cross dichroic prism 43 has a square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. These dielectric multilayer films transmit the color light through the exit side polarizing plate 45 disposed on the side facing the projection optical system 50 (G color light side), and the remaining two exit side polarizing plates 45 (R color light side and Reflects colored light via the B color light side). In this way, each color light modulated by each incident-side polarizing plate 44, each liquid crystal panel 421, and each emission-side polarizing plate 45 is synthesized to form a color image.

The projection optical system 50 is configured as a combined lens obtained by combining a plurality of lenses, and enlarges and projects a color image formed by the optical device 40 on a screen (not shown).
As shown in FIG. 1, the optical component housing 60 includes a component storage member 61 and a lid-like member 62 (see FIG. 6) that is not shown in FIG. 1.
The component storage member 61 is formed in a container shape having an open upper side and the other end side opposite to the one end side connected to the lamp housing 10B having a U-shape in plan view, and the optical components 21 to 24 and 31 to 33 described above. , 36 to 39, 41, 44 are accommodated in the interior. In addition, an optical device main body 40A, which will be described later, is disposed in a U-shaped inner portion in plan view on the other end side of the component storage member 61. Further, the projection optical system 50 is connected to the tip portion on the other end side of the component storage member 61.

  In this component storage member 61, four straightening members 611 are provided in the U-shaped inner portion in plan view as shown in FIG. More specifically, as shown in FIG. 1, the four rectifying members 611 are arranged at four corner positions in the U-shaped inner portion in a plan view (rectangular four corner positions when the U-shaped tip portions are connected by straight lines). Each is provided and has a substantially quadrangular prism shape extending in a vertical direction (a direction orthogonal to the paper surface in FIG. 1). The vertical height dimension of these rectifying members 611 is set to be substantially the same as the vertical height dimension of the component storage member 61, and the optical device main body 40 </ b> A is placed in the U-shaped inner portion of the component storage member 61 in a plan view. When arranged, the height dimension of the pair of plate-like portions (the first plate-like portion and the second plate-like portion) constituting the light modulation device 42 of the optical device main body 40A is set to be substantially the same or slightly larger. . In the following, for convenience of explanation, of the two rectifying members 611 provided at the U-shaped tip portion of the component housing member 61, the rectifying member on the blue light side is changed from the rectifying member 611A and the rectifying member 611A to a U-shape. A rectifying member 611B, a rectifying member 611C, and a rectifying member 611D are clockwise along the line.

As shown in FIG. 1, the rectifying member 611A has a blue light side light modulation device 42B, which will be described later, when the optical device main body 40A is disposed in the U-shaped inner portion of the component storage member 61 in a plan view. A rectifying surface 612 (612A1) is formed so as to face the plate portion in a substantially parallel state.
As shown in FIG. 1, the rectifying member 611B has a blue light side light modulation device 42B, which will be described later, when the optical device main body 40A is disposed in the U-shaped inner portion of the component storage member 61 in a plan view. A rectifying surface 612 (612B1) that faces the plate-like portion in a substantially parallel state is formed. In addition, the rectifying member 611B, which will be described later, constitutes the green light side light modulation device 42G when the optical device main body 40A is disposed on the U-shaped inner side portion of the component storage member 61 as shown in FIG. A rectifying surface 612 (612B2) that faces the first plate-like portion in a substantially parallel state is formed.

As shown in FIG. 1, the rectifying member 611C has a green light side light modulation device 42G, which will be described later, when the optical device main body 40A is arranged in the U-shaped inner portion of the component storage member 61 in a plan view. A rectifying surface 612 (612C1) that faces the plate-like portion in a substantially parallel state is formed. Further, as shown in FIG. 1, the rectifying member 611C, which will be described later, constitutes the red light side light modulation device 42R when the optical device main body 40A is disposed in the U-shaped inner portion of the component storage member 61 in a plan view. A rectifying surface 612 (612C2) that faces the first plate-like portion in a substantially parallel state is formed.
As shown in FIG. 1, the rectifying member 611 </ b> D has a red light side light modulation device 42 </ b> R, which will be described later, when the optical device main body 40 </ b> A is disposed on the U-shaped inner portion of the component storage member 61. A rectifying surface 612 (612D1) that faces the plate-like portion in a substantially parallel state is formed.

  And each rectification | straightening surface 612 is set so that a predetermined | prescribed clearance gap may be formed between each said plate-shaped part. In the state in which the optical device main body 40A is disposed in the U-shaped inner portion of the component storage member 61 as shown in FIG. 1, air can flow between each rectifying surface 612 and each plate-like portion as shown in FIG. A second space A2 (see FIG. 4) is formed.

  The lid-like member 62 is a member that closes the upper opening portion of the component storage member 61 and has a shape corresponding to the planar shape of the component storage member 61.

[Configuration of optical device body]
2 or 3 is a diagram showing a configuration of the optical device main body 40A. Specifically, FIG. 2 is a perspective view of the optical device main body 40A. FIG. 3 is an exploded perspective view of the optical device main body 40A. 2 and 3, only the light modulation device 42 on the B color light side and the emission side polarization plate 45 among the light modulation devices 42 and the emission side polarization plates 45 are illustrated for convenience of explanation. In addition, the R color light side and the G color light side have the same configuration as the B color light side.
As shown in FIG. 2 or FIG. 3, the optical device main body 40A includes three light modulation devices 42, three exit-side polarizing plates 45, a cross dichroic prism 43, three spacers 46, and a pedestal 48. . 2 and 3, as described above, only the configuration on the B color light side is illustrated, and therefore, the three spacers 46 similarly illustrate only one on the B color light side.

[Configuration of light modulator]
As shown in FIG. 2 or FIG. 3, the light modulation device 42 has a configuration in which a liquid crystal panel 421 is supported and fixed by a light modulation element holding body 422.
As shown in FIG. 3, the light modulation element holder 422 includes a first holding member 4221 and a second holding member 4222 as a pair of holding members, and the liquid crystal panel 421 is sandwiched and fixed by the holding members 4221 and 4222. To do.
As shown in FIG. 3, the first holding member 4221 is disposed on the light beam incident side of the liquid crystal panel 421, and includes a holding member main body 4221A and a pair of upright pieces 4221B.

As shown in FIG. 2 or FIG. 3, the holding member main body 4221A is formed of a rectangular plate in plan view, and has an opening 4221C corresponding to the light modulation surface (image forming region) of the liquid crystal panel 421 at a substantially central portion. Have. The light modulation surface is substantially orthogonal to the optical axis (illumination optical axis A) of the incident light beam.
In the holding member main body 4221A, a recessed portion 4221D that is recessed toward the light beam incident side is formed at the periphery of the opening 4221C as shown in FIG.
The recess 4221D has a shape corresponding to the outer shape of the substrate 4211 (counter substrate) arranged on the light beam incident side among the pair of substrates 4211 and 4212 constituting the liquid crystal panel 421.
In the holding member main body 4221A, fixing holes 4221E for fixing the holding members 4221 and 4222 are formed in the four corner portions (near the four corners of the opening 4221C), respectively.

  As shown in FIG. 3, the pair of upright pieces 4221B are provided along a pair of mutually parallel edges that intersect the horizontal direction of the holding member main body 4221A, and are substantially orthogonal to the plate surface of the holding member main body 4221A. This is the portion protruding to the light beam incident side.

  As shown in FIG. 3, the second holding member 4222 is disposed on the light beam emission side of the liquid crystal panel 421, has substantially the same shape as the first holding member 4221, and constitutes the first holding member 4221. Holding member body 4222A (including opening 4222C, recess 4222D, and fixing hole 4222E) corresponding to holding member body 4221A (including opening 4221C, recess 4221D, and fixing hole 4221E) and a pair of upright pieces 4221B. ) And a pair of upright pieces 4222B.

Here, the concave portion 4222D is located at the peripheral portion of the opening 4222C, and is formed to be recessed toward the light beam exit side as shown in FIG. And this recessed part 4222D has a shape corresponding to the external shape of the board | substrate 4212 (drive board | substrate) arrange | positioned among the pair of board | substrates 4211 and 4212 which comprises the liquid crystal panel 421 at the light beam emission side.
Further, as shown in FIG. 3, the pair of upright pieces 4222B are provided along a pair of mutually parallel edges that intersect the horizontal direction of the holding member main body 4222A, and are substantially the same as the plate surface of the holding member main body 4222A. It protrudes perpendicularly to the light beam exit side. Further, as shown in FIG. 3, the pair of standing pieces 4222 </ b> B is set to have a larger length dimension in the protruding direction than the pair of standing pieces 4221 </ b> B.

  As shown in FIG. 2 or FIG. 3, the end surfaces of the holding members 4221 and 4222 opposite to the protruding direction of the pair of standing pieces 4221B and 4222B in a state where the pair of standing pieces 4221B and 4222B are parallel to each other. The liquid crystal panel 421 is fixed to the holding members 4221 and 4222 by fixing each of the fixing holes 4221E and 4222E with the four fixing screws 4223 in a state where the liquid crystal panel 421 is sandwiched between the peripheral portions of the openings 4221C and 4222C. To be clamped. Although illustration is omitted in FIG. 3, when assembling the light modulation device 42, each plane portion excluding the recesses 4221D and 4222D in the holding member bodies 4221A and 4222A between the liquid crystal panel 421 and the recesses 4221D and 4222D. Between them, an elastic member 4224 (see FIG. 4) such as an adhesive or a gap material having thermal conductivity is interposed. In such a state, the bottom surfaces and side surfaces of the recesses 4221D and 4222D can transmit heat to the light beam incident side end surfaces and the light beam emission side end surfaces and side end surfaces of the substrates 4211 and 4212 constituting the liquid crystal panel 421 via the elastic member 4224. In addition to the connection, each planar portion excluding the recesses 4221D and 4222D in the holding member main bodies 4221A and 4222A is connected via the elastic member 4224 so that heat can be transferred.

  Each of the holding members 4221 and 4222 described above is formed by performing sheet metal processing on a material such as a metal having thermal conductivity (for example, Al material, Mg alloy, Ni alloy). Each holding member 4221 and 4222 may be formed by sheet metal processing, or may be a molded product formed by injection molding or the like using a synthetic resin material having thermal conductivity.

[Spacer configuration]
The spacer 46 is disposed between the light modulation device 42 and the cross dichroic prism 43 and is a member for fixing the light modulation device 42 to the light beam incident side end surface of the cross dichroic prism 43. As shown in FIG. 3, the spacer 46 includes a spacer body 461 and a pair of fixing portions 462.

As shown in FIG. 3, the spacer main body 461 is formed of a plate body having a rectangular shape in plan view, and has an opening 4611 that allows a light beam to pass through at a substantially central portion.
More specifically, as shown in FIG. 3, the spacer main body 461 has a horizontal length dimension set to be substantially the same as the horizontal length dimension of the cross dichroic prism 43, and the vertical length dimension is cross. The length is set to be longer than the vertical dimension of the dichroic prism 43. Further, the opening 4611 is set to have a dimension larger than the outer dimension of the exit-side polarizing plate 45 as shown in FIG.

As shown in FIG. 3, the pair of fixing portions 462 are provided along a pair of mutually parallel edges that intersect the horizontal direction of the spacer main body 461, and are substantially perpendicular to the plate surface of the spacer main body 461. It is a portion protruding to the incident side. The separation dimension of the pair of fixing portions 462 is set smaller than the separation dimension of the pair of upright pieces 4222B described above.
In the state where the optical device main body 40A is assembled, the spacer 46 has an end surface opposite to the protruding direction of the pair of fixing portions 462 in the spacer main body 461 on the light incident side end surface of the cross dichroic prism 43 by an adhesive or the like. The inner surfaces facing each other of the pair of upright pieces 4222B of the second holding member 4222 constituting the light modulation device 42 are fixed to the outer surfaces of the pair of fixing portions 462 with an adhesive or the like.

  The spacer 46 described above is formed by subjecting a material such as a metal having thermal conductivity (for example, Al material, Mg alloy, Ni alloy) to sheet metal processing. The spacer 46 may be formed by sheet metal processing, or may be a molded product formed by injection molding or the like using a synthetic resin material having thermal conductivity.

[Configuration of pedestal]
As shown in FIG. 2 or FIG. 3, the pedestal 48 has a substantially rectangular parallelepiped shape having a square shape in plan view, and is fixed to a lower surface that is an end surface intersecting the three light beam incident side end surfaces of the cross dichroic prism 43. More specifically, the pedestal 48 is set to a square shape in plan view that is substantially the same as the square shape in plan view of the cross dichroic prism 43. That is, when the pedestal 48 is fixed to the lower surface of the cross dichroic prism 43, the side surfaces (the light beam incident side end surface and the light beam emission side end surface) of the cross dichroic prism 43 and the side surface of the pedestal 48 are substantially flush.
The pedestal 48 described above is made of a metal material substantially equal to the thermal expansion coefficient of the material of the cross dichroic prism 43. More specifically, the material of the pedestal 48 has a thermal conductivity of 180 W / m · K or more and 390 W / m · K or less and a thermal expansion coefficient of 4.0 × 10K ⁻⁶ or more and 17. 0 × ^{10K -6} sintered alloy material is less, for example, Ni alloy, Mo-Cu materials, W-Cu material, sintered alloy material and the like of Fe-Ni based material can be exemplified. In particular, the material of the base 48 is preferably a Mo—Cu material.

[Assembly method of optical device body]
Next, an assembly method (manufacturing method) of the optical device main body 40A described above will be described.
First, the position of the cross dichroic prism 43 is adjusted with respect to the base 48 and fixed.
Specifically, first, the base 48 is installed at a predetermined position. Then, a thermosetting adhesive or an ultraviolet curable adhesive is applied to the upper surface of the pedestal 48, and the lower surface of the cross dichroic prism 43 is brought into contact with the upper surface of the pedestal 48. Then, the position adjustment of the cross dichroic prism 43 with respect to the pedestal 48 is performed with the adhesive uncured. For this position adjustment, for example, the upper surface of the cross dichroic prism 43 is detected by an optical image detection device such as a CCD (Charge Coupled Device), and the two dielectric multilayer films of the cross dichroic prism 43 are based on the detected image. It is possible to employ a configuration in which the position is adjusted so that the cross position formed in the above becomes a predetermined position. Further, for example, a configuration may be adopted in which a light beam is introduced from the light beam incident side end surface of the cross dichroic prism 43 and the position of the cross dichroic prism 43 is adjusted based on the light beam emitted from the light beam emission side end surface. After the position adjustment, the adhesive is cured with hot air or ultraviolet rays, and the pedestal 48 and the cross dichroic prism 43 are fixed.

Next, the three exit-side polarizing plates 45 are respectively fixed to predetermined positions with respect to the respective light-incident side end surfaces of the cross dichroic prism 43 fixed to the pedestal 48 with adhesives or double-sided tapes on the basis of the outer shape.
Next, the three spacers 46 are fixed to predetermined positions on the respective light beam incident side end surfaces of the cross dichroic prism 43 by adhesives or the like on the basis of the outer shape. More specifically, while the respective exit-side polarizing plates 45 are inserted into the respective openings 4611 constituting the respective spacers 46, the end surfaces of the respective spacer main bodies 461 opposite to the protruding directions of the pair of fixing portions 462 are heated, for example. The cross dichroic prism 43 is fixed to each light beam incident side end surface and the side surface of the pedestal 48 by an adhesive having conductivity. That is, each spacer 46 is set to have a vertical length that is substantially the same as or slightly larger than a vertical length of a unit in which the cross dichroic prism 43 and the base 48 are integrated.
As described above, in a state where the spacer 46 is fixed to the light incident side end face of the cross dichroic prism 43 and the side face of the pedestal 48, the inner wall surface of each opening 4611 and each exit side polarizing plate 45 are spaced apart from each other by a predetermined distance. In other words, each spacer 46 and each exit-side polarizing plate 45 are in a state of being thermally insulated. In addition, each spacer 46 and pedestal 48 are connected so that heat can be transferred.

Next, the three light modulation devices 42 are assembled as described above.
Next, in a state where a thermosetting adhesive or an ultraviolet curable adhesive having thermal conductivity is applied to the inner surfaces of the pair of upright pieces 4222B of the second holding member 4222 constituting the light modulation device 42 facing each other, The spacers 46 fixed to the cross dichroic prism 43 abut on the outer surfaces of the pair of fixing portions 462. In this state, the light modulation device 42 is attached to the spacer 46 by the surface tension of the thermosetting adhesive or the ultraviolet curable adhesive in an uncured state.
The mounting as described above is carried out with respect to the three spacers 46 by the three light modulation devices 42, respectively, and the three liquid crystal panels 421 are opposed to the respective light beam incident side end surfaces of the cross dichroic prism 43. .

Then, the mutual position adjustment of the three liquid crystal panels 421 is performed in a state where the adhesive is uncured. Specifically, alignment adjustment and focus adjustment are performed by adjusting the position of the inner surface of the pair of upright pieces 4222B of the second holding member 4222 with respect to the outer surfaces of the pair of fixing portions 462 of the spacer 46. Here, the alignment adjustment refers to the X-axis direction, the Y-axis direction, and the XY direction when the optical axis direction of the light beam incident on each liquid crystal panel 421 is the Z-axis and the two axes perpendicular to the Z-axis are the X and Y axes. It means adjustment of the rotational direction (θ direction) in the plane. Focus adjustment means adjustment of the Z-axis direction, the rotation direction about the X axis (Xθ direction), and the rotation direction about the Y axis (Yθ direction).
Further, after each liquid crystal panel 421 is positioned at a predetermined position with respect to the cross dichroic prism 43, the adhesive is cured by hot air, ultraviolet rays, etc., and the light modulation device 42 is fixed to the spacer 46.
The optical device main body 40A is assembled by the procedure as described above.

FIG. 4 is a diagram showing a state in which the optical device main body 40A is installed in the optical component casing 60. As shown in FIG. Specifically, FIG. 4 is a view of the optical device body 40A as viewed from above. In FIG. 4, only the B color light side of the cross dichroic prism 43 is illustrated for convenience of explanation, as in FIGS. 2 and 3.
After the optical device main body 40A is assembled as described above, in the state where the optical device main body 40A is installed in the optical component casing 60, as shown in FIG. 4, the liquid crystal panel 421 has a light beam incident side and a light beam emission side, respectively. First spaces A11 and A12 that allow air to flow are formed.
Specifically, on the light beam incident side of the liquid crystal panel 421, as shown in FIG. 4, the incident-side polarizing plate 44 installed in the optical component casing 60 and the holding member main body 4221A constituting the first holding member 4221 are provided. The pair of upright pieces 4221 </ b> B and the liquid crystal panel 421 form a first space A <b> 11 that allows air to flow in the vertical direction (the direction perpendicular to the paper surface in FIG. 4).
Further, on the light beam exit side of the liquid crystal panel 421, as shown in FIG. 4, a light beam incident side end face of the cross dichroic prism 43, a pair of fixing portions 462 of the spacer 46, and a holding member body constituting the second holding member 4222 4222A, the pair of upright pieces 4222B, and the liquid crystal panel 421 form a first space A12 that allows air to flow in the vertical direction (the direction orthogonal to the paper surface in FIG. 4).

That is, each of the pair of upright pieces 4221B and 4222B is connected to the liquid crystal panel 421 so as to be able to transfer heat, and the pair of left and right side end portions that intersect the plane parallel to the light modulation surface of the liquid crystal panel 421 and face each other are planar. The first spaces A11 and A12 that allow air to flow are formed on the light incident side and the light emitting side of the liquid crystal panel 421. For this reason, each pair of upright pieces 4221B and 4222B corresponds to a pair of plate-like portions in the present invention. Hereinafter, for convenience of explanation, when the light modulation device 42 is viewed from the light beam incident side, the upright pieces 4221B and 4222B positioned on the right side are referred to as first plate-like portions 422R, and the upright pieces 4221B and Let 4222B be the 2nd plate-shaped part 422L.
Further, in a state where the optical device main body 40A is installed in the optical component casing 60, air can flow between the plate-like portions 422R and 422L and the rectifying surfaces 612 of the rectifying members 611 as shown in FIG. A second space A2 is formed.

[Configuration of cooling unit]
FIG. 5 is a perspective view showing a schematic configuration of the cooling unit 7.
FIG. 6 is a perspective view showing the positional relationship between the cooling unit 7 and the optical component casing 60.
Specifically, FIGS. 5 and 6 are perspective views as seen from the front side of the projector 1.
The cooling unit 7 introduces cooling air from the outside of the projector 1 to cool the inside of the projector 1. Hereinafter, the structure of the cooling unit 7 that mainly cools the liquid crystal panel 421 of the optical device 40 will be described. In addition, description is abbreviate | omitted about the structure of the cooling unit 7 which cools the light source device 10 and the said power supply unit.
As shown in FIG. 5, the cooling unit 7 includes sirocco fans 71 and 72 as a pair of cooling fans, and a discharge-side duct 73 disposed on a discharge port side (not shown) of the pair of sirocco fans 71 and 72. .

  The pair of sirocco fans 71, 72 has a suction port (not shown) disposed along the lower case of the exterior casing 2, is driven and controlled by the control device, and is driven by the control device and is formed in the lower case by driving. Then, the cooling air outside the projector 1 is sucked in via the, and the sucked cooling air is discharged rearward along the bottom surface of the lower case.

In the present embodiment, the amount of heat generated by each liquid crystal panel 421 of the green light side light modulator 42G and the amount of heat generated by the liquid crystal panel 421 of the red light side light modulator 42R is larger than that of the liquid crystal panel 421 of the red light side light modulator 42R. In order to cool each liquid crystal panel 421 efficiently, the discharge side duct 73 is configured as follows.
As shown in FIG. 6, the discharge-side duct 73 is disposed on the lower side of the optical component casing 60. The discharge side duct 73 guides the cooling air discharged from the sirocco fan 71 to the first circulation part 731 that guides the cooling air discharged from the sirocco fan 71 to the lower side of the red light side and the green light side of the optical device body 40A. A second circulation part 732 that guides the optical device main body 40A to the lower side of the blue light side, and the cooling air that has circulated through the first circulation part 731 and the second circulation part 732 is U-shaped in a plan view of the optical component casing 60. The inner portion (optical device main body 40A) is allowed to flow upward from below.

As shown in FIG. 5 or FIG. 6, the first circulation part 731 extends from one end side to which a discharge port (not shown) of the sirocco fan 71 is connected toward the rear side, and the other end side is the red light of the optical device main body 40A. Branching into two parts: a red light side branching part 7311 that bends and extends downward on the side and a green light side branching part 7312 that bends and extends downward on the green light side of the optical device main body 40A. To do.
The red light side branching unit 7311 is parallel to the light modulation surface of the red light side light modulation device 42R (liquid crystal panel 421) (on the red light side, the opposite surface of the liquid crystal panel 421, the incident side polarizing plate 44, and the emission side polarizing plate 45). Extending so as to be substantially orthogonal to the surface to be cut).
In the red light side branching portion 7311, the upper side end surface, which is the outer peripheral surface along the flow direction in which the cooling air flows, is located at a position corresponding to the position where the red light side light modulation device 42R is disposed. Alternatively, as shown in FIG. 6, a red light side outlet 7311 </ b> A is formed to flow cooling air flowing through the inside toward an upper side substantially orthogonal to the flowing direction and blow the cooling air to the red light side light modulation device 42 </ b> R. ing. That is, the red light side branching unit 7311 circulates the cooling air discharged from the sirocco fan 71 in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device 42R (liquid crystal panel 421). Then, it flows out upward via the red light side outlet 7311A and blows air to the red light side light modulation device 42R (first space A11, A12, etc.).

The green light side branching unit 7312 is parallel to the light modulation surface of the green light side light modulation device 42G (liquid crystal panel 421) (on the green light side, the opposite surface of the liquid crystal panel 421, the incident side polarizing plate 44, and the emission side polarizing plate 45). Extending in the direction along the surface.
In this green light side branching portion 7312, the end of the flow direction end portion through which the cooling air flows is the first plate-like portion 422R and the second plate-like portion 422L constituting the green light-side light modulation device 42G. Among these, it arrange | positions so that it may be located in the said distribution direction front | former stage rather than the arrangement position of the 1st plate-shaped part 422R arrange | positioned at the said distribution direction latter stage side (refer FIG. 8).
Further, in the green light side branching portion 7312, on the upper side end surface that is the outer peripheral surface along the flow direction in which the cooling air flows inside, at a position corresponding to the arrangement position of the green light side light modulation device 42G, As shown in FIG. 5 or FIG. 6, the cooling air flowing through the inside flows out toward the upper side substantially orthogonal to the flowing direction, and the cooling air is blown into the first spaces A11 and A12 of the green light side light modulation device 42G. A first outlet 7312A is formed.

Further, in the green light side branch portion 7312, a second outlet 7312B for allowing cooling air flowing through the inside to flow out along the flow direction is formed at the end of the flow direction end portion as shown in FIG. Has been.
Furthermore, in this green light side branching portion 7312, the cooling air that has flowed out through the second outlet 7312 B is supplied to the end of the circulation direction end portion as shown in FIG. 5 or FIG. Of the first plate-like portion 422R and the second plate-like portion 422L constituting the light modulation device 42G, the first plate-like portion 422R disposed on the downstream side in the flow direction and the rectifying surface 612B2 of the rectifying member 611B. A wind guide portion 7312C that leads to the second space A2 is provided. As shown in FIG. 5 or FIG. 6, the air guide portion 7312 </ b> C is formed in a box shape, and below and to the side of the second outlet port 7312 </ b> B at the end of the end portion in the flow direction of the green light side branch portion 7312. It extends in a substantially horizontal direction from one end connected to the side, and has a shape in which the other end bends upward.

Further, in the green light side branching portion 7312, the upper side end surface is disposed on the upstream side in the distribution direction of the first plate-like portion 422R and the second plate-like portion 422L constituting the green light-side light modulation device 42G. As shown in FIG. 5 or FIG. 6, the cooling air flowing through the interior is substantially orthogonal to the position corresponding to the second space A2 between the second plate-shaped portion 422L and the rectifying surface 612C1 of the rectifying member 611C. A third outlet 7312D is formed to flow out upward.
Further, in the green light side branch portion 7312, as shown in FIG. 5 or FIG. 6, the cooling air flowing out through the third outlet 7312 </ b> D is transferred to the inner peripheral edge of the third outlet 7312 </ b> D as green light. An auxiliary rectifying unit 7312E that leads to the second space A2 between the second plate-like part 422L that constitutes the side light modulation device 42G and the rectifying surface 612C1 of the rectifying member 611C is provided. As shown in FIG. 5 or FIG. 6, the auxiliary rectifying unit 7312E is formed in a plate shape, and one end side projects into the green light side branching unit 7312 via the third outlet port 7312D, and the other end side is the third side. The green light side branch portion 7312 has a shape protruding to the outside through the outflow port 7312D.

As shown in FIG. 5 or FIG. 6, the second flow part 732 extends from one end side to which the discharge port (not shown) of the sirocco fan 72 is connected toward the rear side. That is, the second distribution unit 732 is on the light modulation surface of the blue light side light modulation device 42B (liquid crystal panel 421) (on the blue light side, the surface opposite to the liquid crystal panel 421, the incident side polarizing plate 44, and the emission side polarizing plate 45). It extends in the direction along the parallel plane.
In the second flow portion 732, the end of the flow direction end portion through which the cooling air flows is the first plate-like portion 422R and the second plate-like portion 422L constituting the blue light side light modulation device 42B. It arrange | positions so that it may be located in the said distribution direction front | former stage side rather than the arrangement position of the 2nd plate-shaped part 422L arrange | positioned at the said distribution direction back | latter stage side (refer FIG. 8).
Moreover, in this 2nd distribution part 732, as shown to FIG. 5 or FIG. 6 in the position corresponding to the arrangement | positioning position of the blue light side light modulation apparatus 42B in the upper side end surface which is an outer peripheral surface along the said distribution direction. In addition, a first outlet 7321 for flowing the cooling air into the first spaces A11 and A12 of the blue light side light modulation device 42B by causing the cooling air flowing through the inside to flow upward toward the upper side substantially orthogonal to the flow direction. Is formed.

Further, in the second circulation part 732, as shown in FIG. 5, a second outlet that allows the cooling air flowing inside to flow out along the circulation direction (rear side) is provided at the end of the circulation direction end portion. 7322 is formed.
Furthermore, in the second circulation part 732, as shown in FIG. 5 or FIG. 6, the cooling air that has flowed out through the second outlet 7322 is passed through the blue light side light at the end of the circulation direction end part. Of the first plate-like portion 422R and the second plate-like portion 422L constituting the modulation device 42B, the second plate-like portion 422L arranged on the downstream side in the flow direction and the second between the rectifying surface 612B1 of the rectifying member 611B. A wind guide portion 7323 that leads to the space A2 is provided. As shown in FIG. 5 or FIG. 6, the wind guide portion 7323 is formed in a box shape, and below and on the side of the second outlet 7322 at the end of the second circulation portion 732 at the end portion in the circulation direction. It has a shape that extends in a substantially horizontal direction from one end side connected to the upper end, and that the other end side bends upward.

Further, in the second flow portion 732, the upper end surface is disposed on the upstream side in the flow direction among the first plate portion 422R and the second plate portion 422L constituting the blue light side light modulation device 42B. As shown in FIG. 5 or FIG. 6, the cooling air flowing through the interior is substantially orthogonally crossed at a position corresponding to the second space A2 between the first plate-like portion 422R and the rectifying surface 612A1 of the rectifying member 611A. A third outlet 7324 is formed to flow out toward the side.
Further, in the second circulation portion 732, the cooling air that has flowed out through the third outlet 7324 is placed on the inner periphery of the third outlet 7324 as shown in FIG. 5 or FIG. An auxiliary rectifying unit 7325 that leads to the second space A2 between the first plate-like part 422R configuring the light modulation device 42G and the rectifying surface 612A1 of the rectifying member 611A is provided. As shown in FIG. 5 or FIG. 6, the auxiliary rectifying unit 7325 is formed in a plate shape, one end side projects into the second circulation unit 732 via the third outlet port 7324, and the other end side is the third flow unit. It has a shape protruding to the outside of the second flow part 732 through the outlet 7324.

(Cooling structure)
Next, the cooling structure by the cooling unit 7 described above will be described.
Hereinafter, as described above, a cooling structure that mainly cools the liquid crystal panel 421 of the optical device 40 will be described. In addition, the description of the cooling structure for cooling the light source device 10 and the power supply unit is omitted.
When the sirocco fans 71 and 72 are driven under the control of the control device, as shown in FIG. 5, the cooling air outside the projector 1 is sent to the sirocco fans 71 and 72 through an intake port (not shown) of the exterior housing 2. Inhaled. Then, the cooling air discharged from the discharge ports (not shown) of the sirocco fans 71 and 72 is discharged from the opening at one end of the first flow portion 731 and the second flow portion 732 of the discharge side duct 73 as shown in FIG. It is introduced into the duct 73.
Hereinafter, the cooling structure on the red light side of the optical device 40 via the red light side branching portion 7311 constituting the first circulation portion 731 and the optical via the green light side branching portion 7312 constituting the first circulation portion 731 will be described. The cooling structure on the green light side of the device 40 and the cooling structure on the blue light side of the optical device 40 through the second circulation part 732 will be described in order.

[Red light side cooling structure]
FIG. 7 is a diagram showing a cooling structure on the red light side of the optical device 40. Specifically, FIG. 7 is a view of the optical device 40 as viewed from above. In FIG. 7, only the R color light side of the cross dichroic prism 43 is illustrated for convenience of explanation.
As shown in FIG. 5, the cooling air RG introduced into the first circulation part 731 by the sirocco fan 71 circulates rearward according to the shape of the first circulation part 731, and then a part of the cooling air RG. The cooling air R is bent by approximately 90 ° and is diverted to the red light side branch portion 7311.
As shown in FIG. 5, the cooling air R circulates in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device 42 </ b> R (liquid crystal panel 421) in accordance with the shape of the red light side branch portion 7311, and then the red color It flows out upward through the light-side outlet 7311A.

  Then, as shown in FIG. 7, the cooling air R flows out through the red light side outlet 7311A, and then passes through the first spaces A11 and A12 and the second space A2 of the red light side light modulation device 42R. It flows in a substantially vertical direction (a direction substantially orthogonal to the paper surface in FIG. 7) from the bottom to the top. And in 1st space A11, A12, the cooling air R is the inner peripheral surface of 1st space A11, A12 of the red light side light modulation apparatus 42R, ie, the incident side polarizing plate 44, a 1st holding member. 4221, a pair of substrates 4211 and 4212 of the liquid crystal panel 421, the second holding member 4222, the spacer 46, and the exit side polarizing plate 45, and these members are cooled. Further, in the second space A2, the cooling air R flows along the upright pieces 4221B of the first holding member 4221 and the upright pieces 4222B of the second holding member 4222 of the red light side light modulation device 42R, Each of these members is cooled.

[Cooling structure of green light side and blue light side]
FIG. 8 is a diagram schematically showing a cooling structure on the green light side and a cooling structure on the blue light side of the optical device 40. Specifically, FIG. 8 is a diagram showing a cross section in the direction along the light modulation surface of the liquid crystal panel 421 constituting the green light side light modulation device 42G and the liquid crystal panel 421 of the blue light side light modulation device 42B.
Since the green light side cooling structure and the blue light side cooling structure are substantially the same, only the green light side cooling structure will be described below, and the description of the blue light side cooling structure will be omitted. Moreover, in FIG. 8, the code | symbol of the structural member by the side of green light is mainly attached, and the code | symbol of the structural member by the side of blue light is attached | subjected in parenthesis.
Of the cooling air RG introduced into the first circulation part 731 by the sirocco fan 71, the cooling air G other than the cooling air R circulates rearward according to the shape of the first circulation part 731 as shown in FIG. After that, it bends approximately 90 ° and circulates in the green light side branch portion 7312.
As shown in FIG. 5 or FIG. 8, the cooling air G circulates in the direction along the light modulation surface of the green light side light modulation device 42G (liquid crystal panel 421) according to the shape of the green light side branching portion 7312. It flows out through the respective outlets 7312A, 7312B, and 7312D. Of course, it is also effective to provide a partition (not shown) between the red light side outlet 7311A and the third outlet 7311D to increase the splitting of the R and G flows.

  The cooling air G1 flowing out through the first outlet 7312A flows out upward as shown in FIG. 5 or FIG. Then, as shown in FIG. 8, the cooling air G1 flows through the first spaces A11 and A12 of the green light side light modulation device 42G from the lower side to the upper side. Here, the end portion of the green light side branching portion 7312 at the end portion in the distribution direction is disposed on the upstream side in the distribution direction with respect to the first plate-like portion 422R of the green light side light modulation device 42G. That is, the edge on the downstream side in the flow direction of the first outlet 7312A is arranged on the upstream side in the flow direction with respect to the first plate-like portion 422R of the green light side light modulation device 42G. For this reason, in the first spaces A11 and A12, as shown in FIG. 8, the cooling air G1 flows out through the first outlet 7312A and then the green light from below the green light side light modulation device 42G. It circulates upward while inclining in the flow direction of the side branch portion 7312.

  Further, the cooling air G2 flowing out through the second outlet 7312B flows out along the flow direction of the green light side branch portion 7312 as shown in FIG. 5 or FIG. Then, as shown in FIG. 8, the cooling air G2 is guided by the wind guide portion 7312C, and the first plate-like portion 422R configuring the green light side light modulation device 42G and the rectifying surface 612B2 of the rectifying member 611B. It is introduced into the second space A2. As shown in FIG. 8, the cooling air G2 introduced into the second space A2 flows in a substantially vertical direction (vertical direction in FIG. 8) from the bottom to the top.

  Further, the cooling air G3 flowing out through the third outlet 7312D is guided by the auxiliary rectification unit 7312E and flows out upward as shown in FIG. 5 or FIG. The cooling air G3 is guided by the auxiliary rectification unit 7312E, so that the second space between the second plate-like part 422L constituting the green light side light modulation device 42G and the rectification surface 612C1 of the rectification member 611C. Introduced to A2. As shown in FIG. 8, the cooling air G3 introduced into the second space A2 flows in the substantially vertical direction (vertical direction in FIG. 7) from the lower side to the upper side.

  The cooling air G1, G2, and G3 described above are incident-side polarizing plate 44, first holding member 4221, a pair of substrates 4211, 4212, and second liquid crystal panel 421 in green light-side spaces A11, A12, and A2. The holding member 4222, the spacer 46, and the exit-side polarizing plate 45 are circulated to cool these members.

The first embodiment described above has the following effects.
In this embodiment, since the light modulation element holding body 422 includes a pair of plate-like portions 422R and 422L, the first space A11, A12 is formed, and air can flow through the first spaces A11 and A12. Further, the discharge side duct 73 constituting the cooling unit 7 includes a green light side branching portion 7312 and a second circulation portion 732, and each of the liquid crystal panels 421 of the green light side light modulation device 42G and the blue light side light modulation device 42B. After the cooling air G and B is circulated in the direction along the light modulation surface, the cooling air G1 and B1 are flowed out in a direction substantially perpendicular to the flow direction of the cooling air G and B inside, and each green light side light modulation is performed. The air is sent toward the first spaces A11 and A12 of the device 42G and the blue light side light modulation device 42B, respectively. For this reason, the cooling air G1 and B1 that is blown from the discharge side duct 73 and flows through the first spaces A11 and A12 is emitted from the liquid crystal panels 421 of the green light side light modulation device 42G and the blue light side light modulation device 42B. In the plane including the modulation surface, the liquid crystal panel 421 is distributed with an inclination from the lower corner portion of each liquid crystal panel 421 toward the upper corner portion which is a diagonal position of the corner portion. Therefore, in the first spaces A11 and A12, the cooling air can be blown over the entire light modulation surfaces of the liquid crystal panels 421 of the green light side light modulation device 42G and the blue light side light modulation device 42B. Both the light incident side and the light exit side of each liquid crystal panel 421 can be uniformly cooled. Further, not only the liquid crystal panels 421 but also the incident-side polarizing plates 44 and the emitting-side polarizing plates 45 on the green light side and the blue light side can be uniformly cooled.

Further, since the holding members 4221 and 4222 including the pair of plate-like portions 422R and 422L are made of a heat conductive material, the heat generated in the liquid crystal panel 421 is transmitted to the pair of plate-like portions 422R and 422L. Can do.
Furthermore, since the projector 1 includes the rectifying member 611, a second space A2 is formed between the pair of plate-like portions 422R and 422L and the rectifying surfaces 612 of the rectifying member 611, and the second space A2 is formed. Air can be circulated in the space A2. The rectifying member 611 introduces the cooling air G2, G3, B2, and B3 out of the first spaces A11 and A12 out of the cooling air G and B blown from the discharge side duct 73 into the second space A2. Let That is, the cooling air G1 and B1 flowing through the first spaces A11 and A12 are blown along the opposing end surfaces of the pair of plate-like portions 422R and 422L, and the pair of plate-like portions 422R and 422L The cooling air G2, G3, B2, and B3 flowing through the second space A2 along the end faces opposite to the end faces are blown. For this reason, the temperature of the pair of plate-like portions 422R and 422L is effectively reduced, the thermal resistance of each of the liquid crystal panels 421 to the pair of plate-like portions 422R and 422L is reduced, and the liquid crystal panel 421 is effective. Can be cooled.
Therefore, in addition to forced air cooling by the cooling unit 7, heat conduction from the liquid crystal panel 421 to the pair of plate-like portions 422 R and 422 L causes the green light side light modulation device 42 G and the blue light side light modulation device to generate a relatively large amount of heat. Each liquid crystal panel 421 of 42B can be cooled effectively, and the thermal deterioration of each liquid crystal panel 421 can be suppressed.
In addition to the forced air cooling, the liquid crystal panel 421 can be effectively cooled by heat conduction from the liquid crystal panel 421 to the pair of plate-like portions 422R and 422L, so that the number of rotations of the sirocco fans 71 and 72 can be reduced. The noise of the projector 1 can be reduced.

Here, the green light side branching portion 7312 has the end position in the distribution direction end portion in the front side in the distribution direction in plan view with respect to the first plate-like portion 422R on the downstream side in the distribution direction constituting the green light side light modulation device 42G. Therefore, the first outlet 7312A is arranged on the upstream side in the flow direction with respect to the first spaces A11 and A12 of the green light side light modulation device 42G in plan view. Therefore, in the first spaces A11 and A12 introduced after passing through the first outlet 7312A, the cooling that circulates inside the green light side branching portion 7312 in the plane including the light modulation surface of the liquid crystal panel 421. The cooling air G1 flowing with an inclination in the flow direction with respect to the direction orthogonal to the flow direction of the air G is more effectively spread over the entire light modulation surface of the liquid crystal panel 421 of the green light side light modulation device 42G. The liquid crystal panel 421 can be cooled more uniformly.
The second circulation part 732 has the same configuration as the green light side branching part 7312, and the cooling air B1 is more effectively blown over the entire light modulation surface of the liquid crystal panel 421 of the blue light side light modulation device 42B. The liquid crystal panel 421 can be cooled more uniformly.

Further, even when the green light side branch portion 7312 is provided as described above, the second outlet 7312B is formed at the end of the flow direction end portion of the green light side branch portion 7312 and guided. Since the wind guide portion 7312C is provided, in the second space A2 between the first plate-like portion 422R on the downstream side in the flow direction constituting the green light side light modulation device 42G and the rectifying surface 612B2 of the rectifying member 611B. The cooling air G2 can be reliably circulated, the temperature of the first plate-like portion 422R of the green light side light modulation device 42G can be effectively reduced, and the liquid crystal panel 421 can be effectively cooled.
The second circulation part 732 has the same configuration as the green light side branching part 7312, and the second outflow port 7322 and the wind guide part 7323 are on the downstream side in the circulation direction constituting the blue light side light modulation device 42B. The cooling air B2 can be reliably circulated in the second space A2 between the second plate-like portion 422L and the rectifying surface 612B1 of the rectifying member 611B, and the second plate-like portion 422L of the blue light side light modulator 42B. Thus, the liquid crystal panel 421 can be effectively cooled.

Furthermore, since the third outlet 7312D is formed on the upper end face of the green light side branching portion 7312 and the auxiliary rectifying plate 7312E is provided, the second upstream side in the flow direction of the green light side light modulation device 42G. Cooling air can be reliably circulated through the second space A2 between the plate-like portion 422L and the rectifying surface 612C1 of the rectifying member 611C, and the temperature of the second plate-like portion 422L of the green light side light modulation device 42G is increased. The liquid crystal panel 421 can be effectively cooled and effectively cooled.
The second circulation part 732 has the same configuration as that of the green light side branching part 7312, and the third outlet 7324 and the auxiliary rectifying plate 7325 constitute a first stage on the upstream side in the circulation direction constituting the blue light side light modulation device 42B. The cooling air can be reliably circulated through the second space A2 between the one plate-like portion 422R and the rectifying surface 612A1 of the rectifying member 611A, and the temperature of the first plate-like portion 422R of the blue light side light modulation device 42B. Can be effectively reduced, and the liquid crystal panel 421 can be effectively cooled.

  Here, since the liquid crystal panel 421 of the red light side light modulation device 42R generates less heat than the respective liquid crystal panels 421 of the green light side light modulation device 42G and the blue light side light modulation device 42B, the first distribution unit As the red light side branching portion 7311 of 731, a blowing structure different from the cooling air blowing structure by the green light side branching portion 7312 or the second circulation portion 732 can be adopted. That is, as the red light side branching portion 7311, a part of the cooling air flowing through the first circulation portion 731 is diverted, and in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device 42R (liquid crystal panel 421). After the cooling air R is circulated, it is possible to adopt a blower structure in which the cooling air R flows out in a direction substantially orthogonal to the flow direction and blows the cooling air R toward the red light side light modulation device 42R. Therefore, the red light side branching unit 7311 and the green light side branching unit 7312 that blow cooling air R, G1, G2, and G3 can be integrated with the red light side light modulation device 42R and the green light side light modulation device 42G, respectively. The first distribution unit 731 can be gathered in a compact manner, and the projector 1 can be downsized.

  Further, unlike the first circulation part 731, the second circulation part 732 does not divide the cooling air B inside, so that the cooling air B 1, B 2, B 3 blown to the blue light side light modulation device 42 B A sufficient flow rate can be secured and the liquid crystal panel 421 of the blue light side light modulation device 42B having a relatively large calorific value can be effectively cooled.

  Furthermore, since the discharge side duct 73 is composed of two parts, that is, a first circulation part 731 and a second circulation part 732 each having independent flow paths in accordance with the heat generation amounts of the three liquid crystal panels 421, the sirocco fan Two of 71 and 72 may be provided. For this reason, even when the liquid crystal panel 421 is composed of three, the number of flow sections and cooling fans constituting the cooling unit 7 can be reduced, and the projector 1 can be reduced in size and weight.

Here, since the concave portions 4221D and 4222D are formed in the holding members 4221 and 4222, the light beam incident side end surface and the light beam emission side end surface and the side end surface of the liquid crystal panel 421, and the bottom surface and side walls of the concave portions 4221D and 4222D, respectively. And the contact area between the liquid crystal panel 421 and the light modulation element holding body 422 is increased as compared with, for example, a configuration in which the recesses 4221D and 4222D are not formed. The heat transfer characteristic to 422 can be improved.
Further, by forming the recesses 4221D and 4222D, when the liquid crystal panel 421 is sandwiched between the pair of holding members 4221 and 4222, for example, compared to a configuration in which the recesses 4221D and 4222D are not formed, each holding member main body 4221A, At least a part of each planar portion excluding the concave portions 4221D and 4222D in 4222A can be brought into contact with each other. For this reason, heat can be transmitted between the first holding member 4221 and the second holding member 4222, and the light beam incident side and the light beam emission side of the liquid crystal panel 421 can be cooled more uniformly.

Further, since the elastic member 4224 is interposed between the liquid crystal panel 421 and the recesses 4221D and 4222D, the contact area between the liquid crystal panel 421 and the light modulation element holding body 422 is increased, and the light modulation element is held from the liquid crystal panel 421. The heat transfer characteristic to the body 422 can be further improved. Similarly, since the elastic member 4224 is disposed between the flat surface portions of the holding member main bodies 4221A and 4222A except for the recesses 4221D and 4222D, the contact area between the holding member main bodies 4221A and 4222A is increased. Heat can be smoothly transferred between the first holding member 4221 and the second holding member 4222, and the light beam incident side and the light beam emission side of the liquid crystal panel 421 can be cooled more uniformly.
Further, by arranging the elastic member 4224 between the members as described above, the manufacturing error is absorbed by the elastic member 4224 even when a manufacturing error or the like occurs in each of the holding members 4221 and 4222. Thus, the assembly of the light modulation device 42 can be carried out smoothly.

Furthermore, since the optical device main body 40A includes the spacer 46, the pair of upright pieces 4222B of the second holding member 4222 constituting the light modulation device 42 are fixed to the pair of fixing portions 462 of the spacer 46. Thus, the light modulation device 42 can be easily attached to the cross dichroic prism 43, and the assembly of the optical device main body 40A can be improved. In particular, since the spacer 46 is configured as a single unit, the assembly of the optical device main body 40A can be improved from the omission of members as compared with the case where the spacer is divided into two bodies, for example.
In addition, since the spacer 46 is made of a heat conductive material, the pair of upright pieces 4222B of the second holding member 4222 and the pair of fixing portions 462 of the spacer 46 are connected so as to be able to transfer heat, so that the liquid crystal panel Heat transfer paths from 421 to the second holding member 4222 to the spacer 46 can be secured, and the liquid crystal panel 421 can be cooled more effectively.

By the way, since the exit side polarizing plate 45 is composed of an absorption type polarizing plate that transmits a light beam having a predetermined polarization direction and absorbs other light beams, the absorbed light beam is converted into heat, and the exit side The temperature of the polarizing plate 45 tends to rise. Further, when the exit-side polarizing plate 45 fixed to the end surface of the cross dichroic prism 43 on the light incident side and the spacer 46 fixed to the end surface of the cross dichroic prism 43 on the light incident side are connected so as to be able to transfer heat, The heat of the side polarizing plate 45 is transferred to the liquid crystal panel 421 through the heat transfer path of the emission side polarizing plate 45 to the spacer 46 to the light modulation element holding body 422 to the liquid crystal panel 421, so that the liquid crystal panel 421 is effectively used. Difficult to cool.
In the present embodiment, in a state where the spacer 46 is fixed to the light beam incident side end surface of the cross dichroic prism 43, the inner wall surface of each opening 4611 and each emission side polarizing plate 45 are spaced apart from each other by a predetermined interval, that is, Each spacer 46 and each exit-side polarizing plate 45 are in a state of being thermally insulated. For this reason, the heat of the exit side polarizing plate 45 is not transmitted to the spacer 46, that is, not transmitted to the liquid crystal panel 421, and the cooling efficiency of the liquid crystal panel 421 can be maintained satisfactorily.

  Further, the optical device main body 40A includes a pedestal 48, and the spacer 46 is connected to the pedestal 48 so as to be able to transfer heat in a state where the spacer 46 is fixed to the light beam incident side end face of the cross dichroic prism 43. The heat of the spacer 46 transmitted along the heat transfer path of the modulation element holder 422 to the spacer 46 can be further transferred to the base 48 having a large heat capacity, and the amount of heat transfer from the liquid crystal panel 421 to other members can be reduced. By increasing the number, the liquid crystal panel 421 can be cooled more effectively. In addition, by configuring the pedestal 48 with a member having a thermal expansion coefficient substantially equal to that of the cross dichroic prism 43, the inclination of the cross dichroic prism 43 on the pedestal 48 caused by a difference in thermal expansion coefficient accompanying a temperature change can be suppressed. . Further, stress on the bonding portion between the pedestal 48 side wall and the spacer 46 can be suppressed. As a result, it is effective in preventing pixel shift by suppressing positional shift between the R, G, and B liquid crystal panels 421 attached to the spacers 46. In addition, since the heat generated by the liquid crystal panel 421 can be transmitted to the pedestal 48 made of a member having high thermal conductivity via the spacer 46, the cooling performance can be further enhanced.

  Further, stray light that enters the light beam incident side end face of the cross dichroic prism 43 can be shielded by the pair of upright pieces 4222B of the second holding member 4222 and the pair of fixing portions 462 of the spacer 46, and formed by the optical device 40. Image light to be maintained can be maintained well.

  As described above, since the thermal deterioration of the light modulation device 42 can be suppressed, the life of the projector 1 can be extended. In addition, even when the projector 1 is used for a long time, a clear projected image can be maintained.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 9 is a perspective view showing a schematic configuration of a cooling unit 8 as a cooling device in the second embodiment.
This embodiment is different from the first embodiment only in the structure of the cooling unit 8 as shown in FIG. Other configurations are the same as those in the first embodiment.

  As shown in FIG. 9, the cooling unit 8 includes a pair of sirocco fans 71 and 72 described in the first embodiment and a discharge side duct disposed on a discharge port side (not shown) of the pair of sirocco fans 71 and 72. 83.

In this embodiment, the amount of heat generated by the liquid crystal panel 421 of the green light side light modulator 42G is larger than the amount of heat generated by the liquid crystal panels 421 of the blue light side light modulator 42B and the red light side light modulator 42R. In order to cool each liquid crystal panel 421 efficiently, the discharge side duct 83 is configured as follows.
The discharge side duct 83 is disposed below the optical component casing 60 in the same manner as the discharge side duct 73 described in the first embodiment, and as shown in FIG. 9, the cooling air discharged from the sirocco fan 71. The first circulation part 831 that guides the cooling air discharged from the sirocco fan 72 to the lower side of the red light side and the blue light side of the optical apparatus body 40A The cooling air that has flowed through the first flow portion 831 and the second flow portion 832 is directed from the lower side to the upper side of the U-shaped inner portion (optical device main body 40A) of the optical component housing 60 in a plan view. Spill.

As shown in FIG. 9, the first circulation portion 831 extends from one end side to which a discharge port (not shown) of the sirocco fan 71 is connected toward the rear side, and the other end side is bent by approximately 90 ° to bend the optical device main body 40A. Extends downward on the green light side. That is, the other end side of the first circulation part 831 extends in a direction along the light modulation surface of the green light side light modulation device 42G (liquid crystal panel 421).
The other end side of the first flow part 831 is substantially the same as the green light side branch part 7312 described in the first embodiment, and the difference is that the extending direction (flow direction of the cooling air) is reversed. (The green light side branching portion 7312 is in the extending direction from the right side to the left side in FIG. 5, whereas the other end side of the first circulation portion 831 is the right side to the right side in FIG. Extending direction towards the). That is, as shown in FIG. 9, the first flow part 831 includes the first outlet 7312A, the second outlet 7312B, and the air guide part 7312C of the green light side branch part 7312 described in the first embodiment. The first outlet 8311, the second outlet 8312, the wind guide portion 8313, the third outlet 8314, and the auxiliary rectifier 8315 are the same as the third outlet 7312D and the auxiliary rectifier 7312E. Have.

As shown in FIG. 9, the second circulation part 832 extends from one end side to which a discharge port (not shown) of the sirocco fan 72 is connected toward the rear side, and the other end side is bent by approximately 90 ° to be bent by about 90 °. The red light side and the blue light side extend downward.
In the second flow part 832, the upper end surface, which is the outer peripheral surface along the flow direction in which the cooling air flows, is located at a position corresponding to the position where the red light side light modulation device 42 R is disposed, as shown in FIG. As shown in the figure, a red light side outlet 8321 is formed to flow a part of the cooling air flowing inside toward the upper side substantially orthogonal to the flowing direction and blow the cooling air to the red light side light modulation device 42R. Yes. That is, after the second circulation unit 832 circulates the cooling air discharged from the sirocco fan 72 in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device 42R (liquid crystal panel 421). Then, a part of the cooling air flows out upward through the red light side outflow port 8321 and is sent to the red light side light modulation device 42R (the first spaces A11, A12, etc.).

  Further, in the second circulation portion 832, on the upper side end surface, as shown in FIG. 9, the cooling air flowing through the inside is placed in the distribution direction at a position corresponding to the arrangement position of the blue light side light modulation device 42 </ b> B. A blue light side outflow port 8322 is formed which flows out toward an upper side substantially orthogonal to blow cooling air to the blue light side light modulation device 42B. That is, the second circulation unit 832 circulates the cooling air discharged from the sirocco fan 72 in a direction substantially orthogonal to the light modulation surface of the liquid crystal panel 421 constituting the blue light side light modulation device 42B. Thereafter, the cooling air flows out upward through the blue light side outflow port 8322 and blows it to the blue light side light modulation device 42B (first spaces A11, A12, etc.).

  The cooling structure by the cooling unit 8 in the present embodiment is the same as the cooling structure described in the first embodiment. More specifically, the cooling structure on the green light side of the optical device 40 via the first circulation part 831 is via the green light side branching part 7312 constituting the first circulation part 731 described in the first embodiment. This is the same as the cooling structure on the green light side of the optical device 40. Further, the cooling structure on the red light side and the blue light side of the optical device 40 via the second circulation part 832 is via the red light side branching part 7311 constituting the first circulation part 731 described in the first embodiment. This is the same as the cooling structure on the red light side of the optical device 40. For this reason, description about the cooling structure by the cooling unit 8 in this embodiment is abbreviate | omitted.

The second embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In this embodiment, the 1st distribution part 831 which constitutes discharge side duct 83 is the same composition as green light side branch part 7312 explained in the 1st embodiment, and generates heat like green light side branch part 7312. The liquid crystal panel 421 of the green light side light modulation device 42G having a relatively large amount can be effectively cooled. Further, unlike the second circulation part 832, the first circulation part 831 blows the cooling air only to the green light side light modulation device 42G, so that the flow rate of the cooling air blown to the green light side light modulation device 42G is sufficient. The liquid crystal panel 421 of the green light side light modulation device 42G having a relatively large calorific value can be cooled more effectively.

  In the present embodiment, each of the liquid crystal panels 421 of the red light side light modulation device 42R and the blue light side light modulation device 42B has a smaller amount of heat generation than the liquid crystal panel 421 of the green light side light modulation device 42G. As the second circulation part 832 constituting the side duct 83, a blower structure different from the cooling air blowing structure by the first circulation part 831 can be adopted. Further, the red light side light modulation device 42 </ b> R and the blue light side light modulation device 42 </ b> B are attached to the respective light beam incident side end faces of the cross dichroic prism 43. For this reason, the red light side light modulation device 42R and the blue light side light modulation device 42R and the blue light side light modulation device 42B are disposed as the second distribution unit 832 so as to straddle the red light side light modulation device 42R and the blue light side light modulation device 42B in a plane. After the cooling air is circulated in a direction substantially orthogonal to the light modulation surface of 42B (each liquid crystal panel 421), the cooling air can be blown to each of the light modulation devices 42R and 42B. As described above, since the respective circulation portions for blowing cooling air to the red light side light modulation device 42R and the blue light side light modulation device 42B can be made common, the second circulation portion 832 can be compactly integrated and the projector 1 can be downsized. Can be planned.

[Third embodiment]
Next, 3rd Embodiment of this invention is described based on drawing.
In the following description, the same structures and the same members as those in the first embodiment and the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 10 is a perspective view showing a schematic configuration of a cooling unit 9 as a cooling device in the third embodiment.
This embodiment is different from the first embodiment only in the structure of the cooling unit 9 as shown in FIG. Other configurations are the same as those in the first embodiment.

  As shown in FIG. 10, the cooling unit 9 is arranged on the discharge port side (not shown) of the pair of sirocco fans 71, 72 in addition to the pair of sirocco fans 71, 72 described in the first embodiment and the second embodiment. A discharge-side duct 93 is provided.

In the present embodiment, the amount of heat generated by each liquid crystal panel 421 of the green light side light modulator 42G and the amount of heat generated by the liquid crystal panel 421 of the red light side light modulator 42R is larger than that of the liquid crystal panel 421 of the red light side light modulator 42R. In order to cool each liquid crystal panel 421 efficiently, the discharge side duct 93 is configured as follows.
The discharge-side duct 93 is arranged below the optical component casing 60 in the same manner as the discharge-side duct 73 described in the first embodiment, and as shown in FIG. 10, the discharge-side duct 93 described in the second embodiment. In addition to the first circulation part 831, the second circulation part 932 guides the cooling air discharged from the sirocco fan 72 to the lower side of the red light side and the blue light side of the optical device body 40 </ b> A. 2 Cooling air that has circulated through the flow portion 932 is caused to flow upward from below the U-shaped inner portion (optical device main body 40A) of the optical component housing 60 from above.

As shown in FIG. 10, the second circulation part 932 extends from one end side to which the discharge port (not shown) of the sirocco fan 72 is connected toward the rear side, and the other end is below the blue light side of the optical device main body 40A. The blue light side branching portion 9321 bent and extended toward the right side and the red light side branching portion 9322 bent and extended toward the lower side of the red light side of the optical device main body 40A are branched into two.
As shown in FIG. 10, the blue light side branching portion 9321 extends in a substantially horizontal direction, and the distal end portion in the extending direction is bent by approximately 90 ° to the rear side to the lower side of the optical device main body 40A on the blue light side. Extend. That is, the blue light side branching portion 9321 extends in a direction substantially orthogonal to the light modulation surface of the blue light side light modulation device 42B (liquid crystal panel 421), and then the blue light side light modulation device 42B (liquid crystal panel 421). It extends in a direction along the light modulation surface.

  And the extension direction front-end | tip part of the blue light side branch part 9321 is substantially the same as the 2nd distribution part 732 demonstrated in the said 1st Embodiment, and as shown in FIG. 10, the 1st of the 2nd distribution part 732 is shown. The first outflow port 9321A, the second outflow port 9321B, and the baffle guide portion 9321C are the same as the outflow port 7321, the second outflow port 7322, and the baffle guide portion 7323.

FIG. 11 is a diagram schematically showing the arrangement position and structure of the bent portion 9321D of the blue light side branching portion 9321. As shown in FIG. Specifically, FIG. 11 is a diagram showing a cross section in a direction along the light modulation surface of the liquid crystal panel 421 constituting the blue light side light modulation device 42B.
In the blue light side branch portion 9321, as shown in FIG. 11, the bent portion 9321D (FIG. 10) includes a first plate portion 422R and a second plate portion 422L that constitute the blue light side light modulation device 42B. A position corresponding to the second space A2 between the first plate-like portion 422R disposed on the upstream side in the flow direction in which the cooling air flows in the blue light side branching portion 9321 and the rectifying surface 612A1 of the rectifying member 611A. It is set to be.
Then, as shown in FIG. 10, the bent portion 9321D has a third outlet that allows the cooling air flowing inside to flow out toward the upper side substantially orthogonal to the upper end surface that is the outer peripheral surface along the flow direction. 9321E is formed.
Further, at the inner peripheral edge of the third outlet 9321E, as shown in FIG. 10 or FIG. 11, the cooling air that has flowed out through the third outlet 9321E forms the blue light side light modulator 42B. An auxiliary rectifying unit 9321F that leads to the second space A2 between the one plate-like part 422R and the rectifying surface 612A1 is provided. As shown in FIG. 10 or FIG. 11, the auxiliary rectifying unit 9321F is formed in a plate shape, and is located on the upper side from the edge on the front end side in the horizontal extending direction of the blue light side branching unit 9321 at the third outlet 9321E. The plate surface is provided so as to be substantially orthogonal to the extending direction. Then, the cooling air that has flowed out through the third outlet 9321E is rectified in a substantially vertical direction (vertical direction in FIG. 11) from below to above by the auxiliary rectifying unit 9321F, and the blue light side light modulation device 42B. Is introduced into the second space A2 between the first plate-like portion 422R and the rectifying surface 612A1.

  As shown in FIG. 10, the red light side branch portion 9322 has the same shape as the red light side branch portion 7311 described in the first embodiment, and the red light side branch portion 7311 has a red light side outlet 7311A. A similar red light side outlet 9322A is provided.

  The cooling structure by the cooling unit 9 in the present embodiment is the same as the cooling structure described in the first embodiment. More specifically, the cooling structure on the green light side of the optical device 40 via the first circulation part 831 and the blue light side of the optical device 40 via the blue light side branching part 9321 constituting the second circulation part 932. The cooling structure is the same as the cooling structure on the green light side of the optical device 40 via the green light side branching section 7312 that constitutes the first circulation part 731 described in the first embodiment. Further, the cooling structure on the red light side of the optical device 40 via the red light side branching portion 9322 constituting the second circulation portion 932 is the red light side constituting the first circulation portion 731 described in the first embodiment. This is the same as the cooling structure on the red light side of the optical device 40 via the branch portion 7311. For this reason, description about the cooling structure by the cooling unit 9 in this embodiment is abbreviate | omitted.

The third embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In this embodiment, the 1st distribution part 831 which constitutes discharge side duct 93 is the same composition as green light side branch part 7312 explained in the 1st embodiment, and generates heat like green light side branch part 7312. The liquid crystal panel 421 of the green light side light modulation device 42G having a relatively large amount can be effectively cooled. In addition, unlike the second circulation part 932, the first circulation part 831 does not divide the cooling air inside, so that the flow rate of the cooling air blown to the green light side light modulation device 42G can be sufficiently secured. The liquid crystal panel 421 of the green light side light modulation device 42G that generates a relatively large amount of heat can be cooled more effectively.

  Further, the blue light side branching portion 9321 of the second circulation portion 932 that constitutes the discharge side duct 93 has the same configuration as the first circulation portion 831, and the blue light side light modulation device 42 </ b> B that generates a relatively large amount of heat. The liquid crystal panel 421 can be effectively cooled.

  In the present embodiment, the liquid crystal panel 421 of the red light side light modulation device 42R has a smaller amount of heat generation than the liquid crystal panels 421 of the green light side light modulation device 42G and the blue light side light modulation device 42B. As the red light side branching part 9322 of the circulation part 932, a blowing structure different from the cooling air blowing structure by the first circulation part 831 or the blue light side branching part 9321 can be adopted. That is, as the red light side branching portion 9322, a part of the cooling air flowing through the second circulation portion 932 is diverted in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device 42R (liquid crystal panel 421). After the cooling air is circulated, it is possible to employ a blowing structure in which the cooling air flows out in a direction substantially orthogonal to the flow direction and blows the cooling air toward the red light side light modulation device 42R. For this reason, the red light side branching portion 9322 and the blue light side branching portion 9321 for blowing cooling air to the liquid crystal panels 421 of the red light side light modulation device 42R and the blue light side light modulation device 42B can be integrated. The distribution unit 932 can be gathered compactly, and the projector 1 can be downsized.

  Further, in the second circulation portion 932, the red light side branch portion 9322 causes cooling air to flow in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device 42R (liquid crystal panel 421), and the blue light side branch portion 9321. In order to realize a structure in which cooling air flows in the direction along the light modulation surface of the blue light side light modulation device 42B (liquid crystal panel 421), the blue light side light modulation device 42B (liquid crystal After cooling air is circulated in a direction substantially orthogonal to the light modulation surface of the panel 421), the flow direction of the cooling air is bent and the cooling air is circulated in a direction along the light modulation surface. Here, the blue light side branching portion 9321 is a second portion between the first plate-like portion 422R on the upstream side in the flow direction in which the bent portion 9321D configures the blue light side light modulation device 42B and the rectifying surface 612A1 of the rectifying member 611A. The position is set to correspond to the space A2. Thus, the size of the projector 1 can be reduced without unnecessarily increasing the structure of the second distribution unit 932 for realizing the above-described structure.

  Further, even when the blue light side branch portion 9321 has the above-described shape, the third outlet 9321E is formed on the upper end surface of the bent portion 9321D, and the auxiliary rectifying portion 9321F is provided. The cooling air can be reliably distributed to the second space A2 between the first plate-like portion 422R on the upstream side in the distribution direction of the blue light side light modulation device 42B and the rectifying surface 612A1 of the rectifying member 611A. The temperature of the first plate-like portion 422R configuring the light side light modulation device 42B can be effectively reduced, and the liquid crystal panel 421 of the blue light side light modulation device 42B can be effectively cooled.

[Fourth embodiment]
Next, 4th Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
12 to 14 are diagrams showing the configuration of the optical device main body 50A in the fourth embodiment. Specifically, FIG. 12 is a perspective view of the optical device main body 50A. FIG. 13 is an exploded perspective view of the optical device main body 50A. FIG. 14 is a diagram showing a state where the optical device main body 50A is installed in the optical component casing 60. As shown in FIG. 12 to 14 show only the B color light side of the cross dichroic prism 43 for convenience of explanation, the same applies to the R color light side and the G color light side.
In the present embodiment, as shown in FIGS. 12 to 14, the optical device main body 50 </ b> A is different from the first embodiment in that the shape of the spacer 56 is changed, and the light according to the change in the shape of the spacer 56. The only difference is that the shape of the modulation element holder 522 is changed, and the other configuration is the same as that of the first embodiment.

The light modulation element holding body 522 has substantially the same configuration and shape as the light modulation element holding body 422 described in the first embodiment, and is different from the light modulation element holding body 522 in that the holding member body 4221A constituting the holding members 4221 and 4222. 4222A, the only difference is that burring holes 4221F and 4222F as pin insertion holes are provided in the four corner portions, that is, in the vicinity of the fixing holes 4221E and 4222E, as shown in FIGS. Other configurations are the same as those of the light modulation element holder 422.
More specifically, in the holding member main body 4221A constituting the first holding member 4221, as shown in FIG. 13, four burring holes 4221F are formed so as to protrude toward the light beam incident side.
Further, as shown in FIG. 13, four burring holes 4222F are formed in the holding member main body 4222A constituting the second holding member 4222 at positions corresponding to the burring holes 4221F so as to protrude to the light beam exit side. ing.
As the light modulation element holding body 522 described above, the same material as that of the light modulation element holding body 422 described in the first embodiment can be adopted.

  The spacer 56 is disposed between the light modulation device 42 and the cross dichroic prism 43 in the same manner as the spacer 46 described in the first embodiment, and the light modulation device 42 with respect to the light incident side end surface of the cross dichroic prism 43. It is a member for fixing. As shown in FIG. 13 or 14, the spacer 56 includes a spacer body 561 and four pin-like portions 562.

The spacer body 561 has the same shape as the spacer body 461 described in the first embodiment. That is, the spacer main body 561 has an opening 5611 similar to the opening 4611 of the spacer main body 461 described in the first embodiment.
The four pin-like portions 562 are formed at positions corresponding to the four burring holes 4221F and 4222F of the light modulation element holding body 522 constituting the light modulation device 42, and are substantially orthogonal to the plate surface of the spacer body 561. It is a part protruding to the injection side.
As the spacer 56 described above, the same material as the spacer 46 described in the first embodiment can be used.

Next, an assembly method (manufacturing method) of the optical device main body 50A described above will be described. The assembling method of the optical device main body 50A is substantially the same as the assembling method of the optical device main body 40A described in the first embodiment, and will be briefly described below.
The assembly method of the optical device main body 50A in this embodiment is different from the assembly method of the optical device main body 40A described in the first embodiment in that the spacer 56 is installed, the light modulation device 42 is installed in the spacer 56, and The only difference is the method of adjusting the positions of the liquid crystal panels 421.

The installation method of the spacer 56 is as follows.
That is, a thermosetting adhesive or an ultraviolet curable adhesive is applied to the end surface of the spacer main body 561 where the pin-like portion 562 is not formed, and the end surfaces are applied to the end surfaces of the light incident side of the cross dichroic prism 43 and the side surfaces of the base 48. Abut. In this state, the spacer 56 is attached to the cross dichroic prism 43 and the pedestal 48 by the surface tension of the thermosetting adhesive or the ultraviolet curable adhesive in an uncured state.
The mounting as described above is performed with the three spacers 56 on the respective light beam incident side end surfaces of the cross dichroic prism 43.

The installation method of the light modulation device 42 with respect to the spacer 56 is as follows.
That is, each burring hole of the light modulation element holding body 522 constituting the light modulation device 42 in a state where a thermosetting adhesive or an ultraviolet curable adhesive is applied to the outer peripheral surface of each pin-like portion 562 constituting the spacer 56. 4221F and 4222F are inserted, and the light modulation device 42 is installed with respect to the spacer 56.
The above-described installation is performed with respect to the three spacers 56 by the three light modulation devices 42, respectively, so that the three liquid crystal panels 421 are opposed to the respective light beam incident side end surfaces of the cross dichroic prism 43. .

The mutual position adjustment method of each liquid crystal panel 421 is as follows.
That is, alignment adjustment is performed with the end face of the spacer main body 561, the end face on the light incident side of the cross dichroic prism 43, and the side face of the pedestal 48 as sliding surfaces, and the outer peripheral face of each pin-like portion 562 and the inner burring holes 4221F and 4222F Focus adjustment is performed using the peripheral surface as the sliding surface.
Then, after positioning each liquid crystal panel 421 at a predetermined position with respect to the cross dichroic prism 43, the adhesive is cured with hot air, ultraviolet rays or the like to fix the spacer 56 to the cross dichroic prism 43 and the pedestal 48, and The light modulation device 42 is fixed to the spacer 56.
Of course, it is possible to adjust the alignment of each pin-shaped portion 562 whose position is determined by the spacer 56 that is bonded and fixed to the cross dichroic prism 43 in advance by using play with the burring holes 4221F and 4222F. It is.

In the state where the optical device main body 50A assembled as described above is installed in the optical component casing 60, as in the first embodiment, as shown in FIG. A space A11 is formed, and a first space A12 is formed on the light emission side of the liquid crystal panel 421. Further, as shown in FIG. 14, a second space A2 that allows air to flow between each rectifying surface 612 (612A1, 612B1, 612B2, 612C1, 612C2, 612D1) and each plate-like portion 422R, 422L. Each is formed.
In addition, about the cooling structure by the cooling unit 7, it is the same as that of the cooling structure of the said 1st Embodiment, and abbreviate | omits description.

The fourth embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In the present embodiment, the pin-like portions 562 of the spacer 56 are inserted into the burring holes 4221F and 4222F of the light modulation device 42, and the light beam emission side end surface of the spacer body 561 of the spacer 56 is used as the light beam incident side end surface of the cross dichroic prism 43. The light modulation device 42 can be easily attached to the cross dichroic prism 43, and the assembly of the optical device body 50A can be improved. In particular, since the pin-shaped portion 562 and the spacer main body 561 are integrated, for example, the assembly of the optical device main body 50A can be improved as compared with a case where the spacer main body 561 is omitted and only the pin-shaped portion 562 is configured. The spacer 56 can favorably maintain the position of the light modulation device 42 with respect to the cross dichroic prism 43, and can form good image light without pixel deviation even when used for a long time.

  In addition, since the pin insertion holes are configured by burring holes 4221F and 4222F, for example, the pin insertion portion 562 and the burring holes 4221F and 4222F are compared with the case where the pin insertion holes are configured by mere holes instead of burring holes. A sufficient adhesion area can be secured, and the position of the light modulation device 42 with respect to the cross dichroic prism 43 can be favorably maintained by the spacer 46. The burring hole may be provided only in one of the holding members 4221 and 4222.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the above embodiments, after the cooling air is circulated in the direction along the light modulation surface of at least one of the liquid crystal panels 421 of the green light side light modulation device 42G and the blue light side light modulation device 42B. Although a cooling structure in which cooling air flows out in a direction substantially orthogonal to the flow direction and blows air to the green light side light modulation device 42G and the blue light side light modulation device 42B is employed, the present invention is not limited to this. What is necessary is just to employ | adopt the said cooling structure at least in any one color light side among the red light side of the optical apparatus 40, a green light side, and a blue light side. At this time, it is preferable to employ the cooling structure on the color light side where the calorific value is relatively large among the color light sides of the optical device 40. If comprised in this way, the freedom degree of the design of the cooling structure in the other color light side except the color light side from which the emitted-heat amount becomes comparatively large among each color light side of the optical apparatus 40 improves.

In each said embodiment, although the discharge side ducts 73, 83, 93 were comprised by two of the 1st distribution parts 731 and 831 and the 2nd distribution parts 732, 832 and 932 which have an independent flow path, respectively. Not limited to this. For example, you may employ | adopt the structure which provides only the number (three in each said embodiment) corresponding to the number (three in said each embodiment) of a distribution part. Further, for example, a configuration in which the cooling air flowing inside is divided for each light modulation device 42 and blown to each light modulation device 42, that is, a configuration in which only one flow portion is provided may be employed. At this time, among the divided cooling air, the cooling air blown to the liquid crystal panel 421 having a relatively large calorific value may be configured to have the cooling structure.
Similarly, the cooling fans are not limited to the two described in the first embodiment, and may be provided according to the number of circulation units.
In the above embodiment, the sirocco fans 71 and 72 are employed as the cooling fans. However, an axial fan in which the cooling air suction direction and the discharge direction are formed on substantially the same axis may be employed.

  In the first embodiment, as the cooling structure on the red light side, as shown in FIG. 7, the cooling air R is circulated only in the first spaces A11 and A12 of the red light side light modulation device 42R. Not only this but the structure which distribute | circulates the cooling air R also to 2nd space A2 similarly to the cooling structure by the side of other blue and green light may be sufficient. The cooling structures in other embodiments having the same cooling structure as the red light side cooling structure in the first embodiment are also the same.

  In each said embodiment, although it comprised with each standing piece 4221B, 4222B as a structure of a pair of plate-shaped part 422R, 422L, it is not restricted to this. The pair of plate-like portions are connected to the liquid crystal panel 421 so that heat can be transferred, and the pair of side end portions that intersect the plane parallel to the light modulation surface of the liquid crystal panel 421 and face each other are covered in a plane, respectively. Any configuration may be used as long as a space that allows air to flow therethrough is formed on at least one of the light beam entrance side and the light beam exit side.

  In the fourth embodiment, the optical device main body 50A is adopted in the first embodiment. However, the configuration is not limited to this, and the optical device main body 50A of the second embodiment or the third embodiment is adopted. It doesn't matter.

  In each of the above embodiments, the recesses 4221D and 4222D are formed on both the first holding members 4221 and 4222. However, the present invention is not limited thereto, and may be formed only on the first holding member 4221, or It may be formed only on the second holding member 4222. When formed only on the first holding member 4221, the depth dimension of the recess 4221D is made larger, and when the liquid crystal panel 421 is sandwiched between the pair of holding members 4221 and 4222, between the holding member main bodies 4221A and 4222A. Is set so that at least a part of the contact. The same applies to the case where the second holding member 4222 is formed only.

  In each of the above-described embodiments, the elastic member 4224 is disposed between the liquid crystal panel 421 and the recesses 4221D and 4222D and between the planar portions of the holding member main bodies 4221A and 4222A excluding the recesses 4221D and 4222D. Not limited to this. The elastic member 4224 may be interposed only between the liquid crystal panel 421 and the recesses 4221D and 4222D, or may be interposed only between the flat portions of the holding member main bodies 4221A and 4222A except for the recesses 4221D and 4222D. May be.

FIG. 15 is a view showing a modification of the first embodiment to the third embodiment.
In the first to third embodiments, the spacer 46 is configured as a single unit, but the present invention is not limited to this.
For example, as shown in FIG. 15, the spacer 66 is configured by two bodies of a first spacer portion 66 </ b> A and a second spacer portion 66 </ b> B corresponding to the pair of standing pieces 4221 </ b> B and 4222 </ b> B in the pair of holding members 4221 and 4222. As shown in FIG. 15, the first spacer portion 66A and the second spacer portion 66B have a substantially L-shaped cross section in the optical device main body 60A, and one end of the L-shape is a pair of holdings. The members 4221 and 4222 are fixed to the light incident side end surface of the cross dichroic prism 43 so as to extend along a pair of mutually parallel end edges that intersect the horizontal direction of the holding member main bodies 4221A and 4222A. Are combined so as to rub against the standing pieces 4221B and 4222B. In addition, as a material of the spacer 66, the material similar to the material of the spacer 46 demonstrated in the said 1st Embodiment is employable. Even when the spacer 66 is employed, the spacer 66 is fixed to the light incident side end surface of the cross dichroic prism 43 and the side surface of the pedestal 48 so as not to be connected to the emission side polarizing plate 45 so as to be able to transfer heat. . Even with such a configuration, the same effects as those of the first embodiment can be obtained. Further, in comparison with the first embodiment, even when a manufacturing error or the like occurs in the spacer, the fixing positions of the first spacer portion 66A and the second spacer portion 66B with respect to the cross dichroic prism 43 are changed. The assembly of the optical device main body 60A can be improved.

  In each of the above embodiments, the light beam incident side end face of the first holding member 4221 may be configured to reflect the incident light beam. For example, the end surface of the first holding member 4221 may be mirror-finished, or a highly reflective material such as a silver alloy may be formed on the end surface of the first holding member 4221 such as a silver alloy by vapor deposition. Alternatively, a metal sheet-like member having high reflectivity may be attached to the light incident side end surface of the first holding member 4221. In such a configuration, the light beam applied to the first holding member 4221 is prevented from being absorbed and converted into heat, the temperature increase of the first holding member 4221 is avoided, and the cooling efficiency of the liquid crystal panel 421 is reduced. Can be maintained well.

  In each of the above-described embodiments, a light-transmitting substrate (dust-proof glass) having a thermal conductivity of 10 W / m · K or more is provided on the light-incident-side end surface and the light-emitting-side end surface of the pair of substrates 4211 and 4212 constituting the liquid crystal panel 421. You may employ | adopt the structure which affixes. Examples of the translucent substrate include Villex (trade name), crystal, YAG (Yttrium Aluminum Garnet) glass, and sapphire glass.

In each of the above-described embodiments, the pair of holding members 4221 and 4222 are fixed at four positions by the four fixing screws 4223. However, it is sufficient that the pair of holding members 4221 and 4222 are fixed at least at two positions, and the number of fixing positions is four. Not limited to.
In each of the above-described embodiments, the pair of holding members 4221 and 4222 are fixed by screw fixing with the fixing screw 4223, but the fixing structure is not limited to screw fixing, but using rivets, heat caulking, welding, or adhesive. It may be fixed by adhesive fixing or the like.

  In each of the above embodiments, each of the holding member main bodies 4221A and 4222A constituting the pair of holding members 4221 and 4222 has a flat portion except for the concave portions 4221D and 4222D of the respective end faces facing each other. Not limited to this, a configuration in which a convex portion is provided on at least one of the end faces may be adopted. In such a configuration, the elastic member 4224 and the convex portion can absorb manufacturing errors generated in the holding members 4221 and 4222, and the light modulator 42 can be assembled smoothly.

  In the above embodiments, the shapes of the first holding member 4221 and the second holding member 4222 are set to be substantially the same, that is, the thickness dimensions are set to be substantially the same, but this is not restrictive. In the case where a microlens array (not shown) is arranged on the counter substrate 4211 of the liquid crystal panel 421, light that does not collect incident light is irradiated outside an opening (not shown) provided in the drive substrate 4212, and the drive substrate. The temperature rises at 4212. Alternatively, in the case where the microlens array is not disposed, the temperature of the counter substrate 4211 rises due to irradiation outside an opening (not shown) provided in the counter substrate 4211. Therefore, a configuration may be adopted in which the thickness dimension of the holding member disposed on the side of the liquid crystal panel 421 where the heat generation amount is larger among the light beam incident side and the light beam emission side of the liquid crystal panel 421 is formed. For example, when the amount of heat generated on the light emission side of the liquid crystal panel 421 is larger than the amount of heat generated on the light incident side, the thickness dimension of the second holding member 4222 is set larger than the thickness dimension of the first holding member 4221. . That is, the thickness dimensions of the holding members 4221 and 4222 may be set as appropriate in accordance with the heat generation balance of the liquid crystal panel 421.

  In each of the above embodiments, the holding member bodies 4221A and 4222A of the holding members 4221 and 4222 and the spacer bodies 461 and 561 of the spacers 46 and 56 have a rectangular shape in plan view, but are not limited to a rectangular shape in plan view. Alternatively, other shapes such as a trapezoidal shape in plan view may be adopted.

  In the fourth embodiment, the spacer 56 may be provided with a support portion that supports the exit-side polarizing plate 45. That is, the exit-side polarizing plate 45 is fixed to the support portion without being attached to the end surface of the cross dichroic prism 43 on the light-incident side. Even in this case, since the contact area between the spacer 56 and the light modulation element holder 422 is small, the heat of the emission side polarizing plate 45 is transmitted to the liquid crystal panel 421 and the temperature rises to the liquid crystal panel 421. Will not occur.

  In each of the above embodiments, the incident-side polarizing plate 44 and the exit-side polarizing plate 45 are configured as absorption-type polarizing plates that transmit a light beam having a predetermined polarization direction and absorb other light beams, but are not limited thereto. Alternatively, a reflective polarizing plate that transmits a light beam having a predetermined polarization direction and reflects other light beams may be used.

In each of the embodiments described above, the light source device 10 is configured as a discharge light emission type light source device. However, the present invention is not limited to this, and a laser diode, an LED (Light Emitting Diode), an organic EL (Electro Luminescence) element, and a silicon light emitting element. Various solid-state light emitting elements such as these may be adopted.
In each of the above embodiments, only one light source device 10 is used and the color separation optical system 30 separates it into three color lights. However, the color separation optical system 30 is omitted, and three color lights are respectively emitted. One of the solid light emitting elements may be configured as a light source device.

  In each of the embodiments described above, the projector 1 is configured as a three-plate projector including three light modulators 42. However, the projector 1 is not limited to this, and may be configured as a single-plate projector including one light modulator. I do not care. Moreover, you may comprise as a projector provided with two light modulation devices, or a projector provided with four or more light modulation devices.

In each of the above embodiments, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In each of the above embodiments, a liquid crystal panel is used as the light modulation element, but a light modulation element other than liquid crystal may be used.
In each of the above embodiments, only the example of a front type projector that projects from the direction of observing the screen has been described. However, the present invention also applies to a rear type projector that projects from the side opposite to the direction of observing the screen. Applicable.

The best configuration for implementing the present invention has been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but it is not intended to depart from the technical concept and scope of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  Since the projector of the present invention can effectively cool the light modulation element and suppress thermal deterioration, it can be used as a projector used for presentations, home theaters, and the like.

FIG. 2 is a plan view illustrating a schematic configuration of the projector according to the first embodiment. The figure which shows the structure of the optical apparatus main body in the said embodiment. The figure which shows the structure of the optical apparatus main body in the said embodiment. The figure which shows the state which installed the optical apparatus main body in the said embodiment in the housing | casing for optical components. The perspective view which shows schematic structure of the cooling unit in the said embodiment. The perspective view which shows the arrangement | positioning relationship between the cooling unit in the said embodiment, and the housing | casing for optical components. The figure which shows the cooling structure by the side of the red light of the optical apparatus in the said embodiment. The figure which shows typically the cooling structure by the side of the green light of the optical apparatus in the said embodiment, and the cooling structure by the side of blue light. The perspective view which shows schematic structure of the cooling unit as a cooling device in 2nd Embodiment. The perspective view which shows schematic structure of the cooling unit as a cooling device in 3rd Embodiment. The figure which shows typically the arrangement position and structure of the bending part of the blue light side branch part in the said embodiment. The figure which shows the structure of the optical apparatus main body in 4th Embodiment. The figure which shows the structure of the optical apparatus main body in the said embodiment. The figure which shows the structure of the optical apparatus main body in the said embodiment. The figure which shows the modification of the said 1st Embodiment thru | or the said 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 7, 8, 9 ... Cooling unit (cooling device), 10 ... Light source device, 42 ... Light modulation device, 42R ... Red light side light modulation device, 42G ... Green light side light modulation device, 42B ... Blue light side light modulation device, 43 ... Cross dichroic prism (color synthesis optical device), 50 ... Projection optical system (projection optical device), 71, 72 .. Sirocco fan (cooling fan), 73, 83, 93 ... discharge side duct, 421 ... liquid crystal panel (light modulation element), 422, 522 ... light modulation element holder, 422R, 422L ... -Plate-like part, 611,611A-611D ... Rectification member, 612,612A1,612B1,612B2,612C1,612C2,612D1 ... Rectification surface, 731,831 ... 1st distribution part, 732,83 , 932... Second distribution part, 7311, 9322... Red light side branch part, 7312... Green light side branch part, 7312A, 7321, 8311, 9321A. 7322, 8312, 9321B ... second outlet, 7312C, 7323, 8313, 9321C ... wind guide part, 7312D, 7324, 8314, 9321E ... third outlet, 7312E, 7325, 8315 , 9321F ... auxiliary rectifier, 9321 ... blue light side branch, 9321D ... bent part, A11, A12 ... first space, A2 ... second space.

Claims (8)

To a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, a projection optical device that enlarges and projects the light beam modulated by the light modulation device, and the light modulation device And a cooling device that blows cooling air and cools the light modulation device,
The light modulation device includes a light modulation element that modulates a light beam emitted from the light source according to image information, and a light modulation element holding body that holds the light modulation element,
The light modulation element holding body is made of a heat conductive material, is connected to the light modulation element so as to be able to transfer heat, and intersects a plane parallel to the light modulation surface of the light modulation element and faces a pair of side end portions Including a pair of plate-like portions that form a first space that allows air to flow on at least one of the light beam incident side and the light beam emission side of the light modulation element.
The cooling device includes a cooling fan that sucks and discharges cooling air, and a discharge duct that guides the cooling air discharged by the cooling fan to a position near the light modulator,
The discharge-side duct flows cooling air discharged by the cooling fan into the interior, distributes the cooling air in a direction along the light modulation surface of the light modulation device, and then cools the cooling air inside. Cooling air flows out in a direction substantially perpendicular to the flow direction of the air and blows toward the light modulation device,
Each of the pair of plate-like portions has respective rectifying surfaces opposed to the respective opposite end surfaces of the pair of plate-like portions, and allows air to flow between the pair of plate-like portions and each of the rectifying surfaces. And a rectifying member that circulates the cooling air that has left the first space out of the cooling air blown from the discharge-side duct into the second space. Characteristic projector. The projector according to claim 1, wherein
In the discharge side duct, the end position of the end portion of the cooling air flowing in the flow direction in the flow direction in a plan view than the arrangement position of the plate-like portion on the downstream side in the flow direction in the pair of plate-like portions Arranged on the front side,
The discharge side duct includes a first outlet for allowing cooling air flowing through the discharge side duct to flow toward the first space on an outer peripheral surface along the flow direction, and an end of the flow direction end portion. A second outflow port for allowing cooling air flowing through the discharge-side duct to flow out is formed at a portion, and the cooling air that has flowed out through the second outflow port to the end portion of the flow direction end portion A projector, comprising: a wind guide portion that guides the second space between the plate-like portion on the rear side in the direction and the rectifying surface on the rear side in the flow direction. The projector according to claim 2,
In the discharge side duct, cooling air flowing through the inside of the discharge side duct on an outer peripheral surface along the flow direction is between the plate-like portion on the upstream side in the flow direction and the rectifying surface on the upstream side in the flow direction. A third outflow port is formed to flow out toward the second space, and the cooling air that has flowed out through the third outflow port to the outer circumferential surface along the flow direction is the plate shape on the upstream side in the flow direction. And an auxiliary rectification unit that leads to the second space between the rectification surface and the rectification surface on the upstream side in the flow direction. The projector according to claim 1, wherein:
The light modulation device comprises a plurality of
The discharge side duct has a plurality of circulation portions that respectively guide cooling air to positions near the plurality of light modulation devices,
At least one of the plurality of circulation portions, after circulating cooling air in a direction along the light modulation surface of the light modulation device corresponding to the circulation portion, A projector characterized in that cooling air flows out in a direction substantially orthogonal to blow air toward the light modulation device. The projector according to claim 4, wherein
The plurality of light modulation devices include a red light side light modulation device corresponding to red light having a red wavelength region, a green light side light modulation device corresponding to green light having a green wavelength region, and a blue wavelength region. It is composed of three of the blue light side light modulation devices corresponding to the blue light having,
A color synthesizing optical device for synthesizing each light beam modulated by each light modulation element constituting the light modulation device, having three light beam incident side end faces for attaching the three light modulation devices, respectively;
The plurality of circulation sections include a first circulation section that guides cooling air to both a position near the green light side light modulation device and a position near the red light modulation device, and the vicinity of the blue light side light modulation device. A second circulation part that guides cooling air to a position,
In the first flow part, the flow direction end side of the cooling air flowing inside is branched into a green light side branch part and a red light side branch part, and the green light side branch part is the green light side light modulator. After the cooling air is circulated in the direction along the light modulation surface, the cooling air flows out in a direction substantially perpendicular to the flow direction of the cooling air inside, and the cooling air is blown toward the green light side light modulation device Then, after the cooling light is circulated in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device, the red light side branching portion is then cooled in a direction substantially orthogonal to the flow direction of the cooling air inside. And the cooling air is blown toward the red light side light modulation device,
The second circulation part causes the cooling air to flow in a direction substantially perpendicular to the flow direction of the cooling air inside after flowing the cooling air in a direction along the light modulation surface of the blue light side light modulation device. A projector that blows cooling air toward the blue light side light modulation device. The projector according to claim 4, wherein
The plurality of light modulation devices include a red light side light modulation device corresponding to red light having a red wavelength region, a green light side light modulation device corresponding to green light having a green wavelength region, and a blue wavelength region. It is composed of three of the blue light side light modulation devices corresponding to the blue light having,
A color synthesizing optical device for synthesizing each light beam modulated by each light modulation element constituting the light modulation device, having three light beam incident side end faces for attaching the three light modulation devices, respectively;
The plurality of flow sections include a first flow section that guides cooling air to a position near the green light side light modulation device, a position near the red light side light modulation device, and a position near the blue light side light modulation device. And a second circulation part that guides cooling air to both sides.
The first flow unit circulates cooling air in a direction along the light modulation surface of the green light side light modulation device, and then flows the cooling air in a direction substantially orthogonal to the flow direction of the cooling air inside. Cooling air is blown toward the green light side light modulation device,
The second circulation unit circulates cooling air in a direction substantially orthogonal to the light modulation surface of the red light side light modulation device and the blue light side light modulation device, and then substantially matches the flow direction of the cooling air inside. A projector characterized in that cooling air flows out in directions orthogonal to each other and blows cooling air toward the red light side light modulation device and the blue light side light modulation device, respectively. The projector according to claim 4, wherein
The plurality of light modulation devices include a red light side light modulation device corresponding to red light having a red wavelength region, a green light side light modulation device corresponding to green light having a green wavelength region, and a blue wavelength region. It is composed of three of the blue light side light modulation devices corresponding to the blue light having,
A color synthesizing optical device for synthesizing each light beam modulated by each light modulation element constituting the light modulation device, having three light beam incident side end faces for attaching the three light modulation devices, respectively;
The plurality of flow sections include a first flow section that guides cooling air to a position near the green light side light modulation device, a position near the red light side light modulation device, and a position near the blue light side light modulation device. And a second circulation part that guides cooling air to both sides.
The first flow unit circulates cooling air in a direction along the light modulation surface of the green light side light modulation device, and then flows the cooling air in a direction substantially orthogonal to the flow direction of the cooling air inside. Cooling air is blown toward the green light side light modulation device,
In the second flow part, the flow direction end side of the cooling air flowing inside is branched into a red light side branch part and a blue light side branch part, and the red light side branch part is the red light side light modulator. The cooling air is circulated in a direction substantially perpendicular to the light modulation surface of the light, and then the cooling air flows out in a direction substantially perpendicular to the flow direction of the cooling air inside to cool toward the red light side light modulation device. Air is blown, and the blue light side branching portion circulates cooling air in a direction along the light modulation surface of the blue light side light modulation device, and then cooled in a direction substantially orthogonal to the flow direction of the cooling air inside. A projector characterized in that air flows out and cooling air is blown toward the blue light side light modulation device. The projector according to claim 7, wherein
The blue light side branching portion circulates cooling air in a direction substantially orthogonal to the light modulation surface of the blue light side light modulation device, then bends the flow direction of the cooling air, and follows the light modulation surface. The bent portion that circulates the cooling air and bends the flow direction in the blue light side branching portion forms the blue light side light modulator and forms a plate-like portion on the upstream side in the flow direction and the rectification on the upstream side in the flow direction. Disposed so as to be planar in the second space between the surfaces,
In the bent portion, the cooling air that circulates inside the blue light side branch portion on the outer peripheral surface along the flow direction is disposed between the plate-like portion on the upstream side in the flow direction and the rectifying surface on the upstream side in the flow direction. A third outflow port for flowing out toward the second space is formed, and the cooling air that has flowed out through the third outflow port on the outer peripheral surface along the flow direction is disposed on the plate-like portion on the upstream side in the flow direction. The projector according to claim 1, further comprising an auxiliary rectification unit that leads to the second space between the rectification surface on the upstream side in the flow direction.

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