JP2014085390A - Projector - Google Patents

Abstract

To provide a projector capable of ensuring expected reliability while suppressing noise.
A light source device that emits light, a light modulation element that modulates light emitted from the light source according to image information, a projection lens that projects the modulated light, and a discharge port that discharges gas. A cooling fan that supplies the gas from the discharge port and cools the light modulation unit; an exhaust port that communicates with the discharge port and is directed to the light modulation unit; A duct for guiding the gas in one direction to the exhaust port.
[Selection] Figure 1

Description

  The present invention relates to a projector.

  2. Description of the Related Art Conventionally, a projector that includes a light modulation unit that modulates light emitted from a light source according to image information, and that includes an optical unit that projects modulated light from the light modulation unit and a projection lens that projects the modulated light. Are known. In such a projector, since reliability may decrease when the temperature of the optical unit rises, a cooling fan that cools the optical unit such as a light modulation unit is provided (for example, see Patent Document 1).

JP 2003-66533 A

  However, in the configuration as in Patent Document 1, the pressure loss in the duct is large, and it is necessary to drive the fan at a high speed or to use a plurality of fans in order to keep the object to be cooled at the required temperature. In this case, there is a problem that noise increases. Further, when a plurality of fans are used, the cost increases and a space for arranging a plurality of cooling fans is also required, which may be a factor in increasing the size of the projector.

  In view of the circumstances as described above, it is an object of the present invention to provide a projector that can suppress noise and cost, suppress an increase in size of the projector, and ensure efficient cooling. .

  A projector according to the present invention, a light source device that emits light, a light modulation element that modulates light emitted from the light source according to image information, a projection lens that projects the modulated light, and a gas discharge A cooling fan that supplies the gas from the discharge port and cools the light modulation unit; and an exhaust port that communicates with the discharge port and is directed to the light modulation unit; A duct for guiding the gas from the discharge port to the exhaust port in one direction.

  According to the present invention, since the gas is guided in one direction from the discharge port to the exhaust port of the cooling fan in the duct, the gas can be efficiently supplied to the light modulation unit while restricting the diffusion of the gas. Thereby, even if it is not the structure where the several cooling fan is arrange | positioned like the past, but the structure where the said one cooling fan is arrange | positioned, the light modulation part can be cooled with the expected cooling efficiency. Thereby, it is possible to ensure the expected reliability while suppressing noise.

In the projector described above, the light modulation element includes three light modulation elements that respectively modulate blue light, green light, and red light, and the exhaust port supplies the gas to each of the three light modulation elements. It is preferable to include three exhaust ports for discharging.
According to the present invention, the light modulation element includes three light modulation elements that respectively modulate blue light, green light, and red light, and the exhaust port discharges three gases to each of the three light modulation elements. Since the mouth is included, gas can be efficiently supplied to the three light modulation elements.

In the projector described above, it is preferable that the green exhaust port directed to the light modulation element that modulates the green light among the three exhaust ports has a larger opening area than the other two exhaust ports.
The light modulation element that modulates green light in the projector may be used more frequently than other light modulation units. According to the present invention, since the green exhaust port directed to the light modulation element that modulates the green light has a larger opening area than the other two exhaust ports, the cooling efficiency of the light modulation element that modulates the green light is improved. This can be increased compared to other light modulation units.

In the projector described above, the duct has a curved portion that curves in a direction orthogonal to a direction in which the gas is discharged from the exhaust port from a direction in which the gas is discharged from the discharge port, and the green exhaust port Is preferably disposed at a position corresponding to the outside of the curved portion with respect to the other two exhaust ports.
According to the present invention, since the duct is curved toward the exhaust port, the flow velocity of the gas flowing outside the curved portion is larger than the inside. In this case, since the green exhaust port is disposed at a position corresponding to the outside of the curved portion of the duct as compared with the other exhaust ports, the green exhaust port is disposed at a position where the gas flow velocity is large in the duct. Will be. Thereby, since the flow velocity of the gas discharged from the green exhaust port can be increased, the cooling efficiency of the green modulation unit can be improved as compared with other light modulation units.

In the projector described above, an optical system that guides light emitted from the light source device to the light modulation element is provided. And a second exhaust port that discharges the air toward the optical system.
According to the present invention, the optical system that guides the light emitted from the light source device to the light modulation element is provided, and the duct is provided in the second circulation part that circulates the air to the optical system. Therefore, the optical system can also be effectively cooled. This leads to further improvement in reliability.

In the projector described above, it is preferable that the duct has a guide portion that guides the gas discharged from the exhaust port toward the light modulation portion.
According to the present invention, the gas discharged from the discharge port is also linearly supplied toward the light modulation unit while being diffused by the guide unit, so that the gas is efficiently supplied to the light modulation unit. Can do.

FIG. 2 is a diagram schematically illustrating a configuration of a projector according to an embodiment of the invention. The perspective view which shows the structure of the cooling device which concerns on this embodiment. The top view which shows the structure of the cooling device which concerns on this embodiment. The side view which shows the structure of the cooling device which concerns on this embodiment. The top view which shows the structure of the cooling device which concerns on the modification of this embodiment. The top view which shows the structure of the cooling device which concerns on the modification of this embodiment. The top view which shows the structure of the cooling device which concerns on the modification of this embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. Note that this embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, the scale and number of actual structures may be different.

FIG. 1 is a diagram schematically illustrating a configuration of a projector 1 according to the present embodiment.
As shown in FIG. 1, a projector 1 modulates light emitted from a light source according to image information to form a color image (image light), and the color image is projected on a projection surface (not shown) such as a screen. This is a device that magnifies and projects. The projector 1 includes a substantially rectangular parallelepiped outer casing 2, a projection lens 3, an optical device 4, and a cooling device 5. Although not shown, in addition to the above-described configuration, the exterior housing 2 includes a power supply device that supplies power to each component in the projector 1 and a control that controls each component in the projector 1. An exhaust fan for discharging the air in the apparatus and the internal space to the outside is disposed.

  The optical device 4 forms a color image corresponding to the image information by optically processing the light emitted from the light source under the control of the control device described above. The optical device 4 includes a light source device 41, an illumination optical device 42, a color separation optical device 43, a relay optical device 44, an image forming system 45, and an illumination optical axis A in which these optical components are set. And an optical component casing 46 disposed at a predetermined position with respect to.

  The light source device 41 includes a light source lamp 411 that emits light and a reflector 412 that aligns the emission direction of the light emitted from the light source lamp 411. Then, the light whose emission direction is aligned by the reflector 412 is emitted toward the illumination optical device 42.

  The illumination optical device 42 includes a first lens array 421, a second lens array 422, a polarization conversion element 423, and a superimposing lens 424. The light emitted from the light source device 41 is divided into a plurality of partial lights by the first lens array 421 and forms an image in the vicinity of the second lens array 422. Each partial light emitted from the second lens array 422 is incident so that its central axis (principal ray) is perpendicular to the incident surface of the polarization conversion element 423, and approximately one type of linearly polarized light is incident on the polarization conversion element 423. As injected. A plurality of partial lights that are emitted from the polarization conversion element 423 as linearly polarized light and pass through the superimposing lens 424 are superimposed on three liquid crystal light valves (light modulation elements) 451 described later of the image forming system 45 that is a cooling target. .

  The color separation optical device 43 includes two dichroic mirrors 431 and 432, and a reflection mirror 433, and has a function of separating a plurality of partial lights emitted from the illumination optical device 42 into three color lights of red, green, and blue. Have.

  The relay optical device 44 includes an incident side lens 441, a relay lens 443, and reflection mirrors 442 and 444, and the color light separated by the color separation optical device 43, for example, red light, which will be described later in the image forming system 45. It has a function of leading to the liquid crystal light valve 451R on the side.

  The image forming system 45 modulates incident light according to image information to form a color image. The image forming system 45 includes three liquid crystal light valves 451 (a liquid crystal light valve for red light 451R, a liquid crystal light valve for green light 451G, and a liquid crystal light valve for blue light 451B), and each liquid crystal An incident side polarizing plate 452 disposed on the upstream side of the light path of the light valve 451, an exit side polarizing plate 453 disposed on the downstream side of the optical path of each liquid crystal light valve 451, and a cross dichroic prism 454 are provided.

  Each incident-side polarizing plate 452 transmits only light having a polarization direction substantially the same as the polarization direction aligned by the polarization conversion element 423 and absorbs other light. A polarizing film is formed on the translucent substrate. It is affixed and configured. The liquid crystal light valve 451 modulates the polarization direction of the light emitted from the incident-side polarizing plate 452 by controlling the alignment state of the liquid crystal according to the drive signal from the control device described above. Each exit-side polarizing plate 453 has substantially the same function as the incident-side polarizing plate 452, transmits light having a certain polarization direction among the light modulated by the liquid crystal light valve 451, and transmits other light. Absorb.

  Blue light from the color separation optical device 43 is supplied to the liquid crystal light valve 451B. Here, the blue light reflected by the dichroic mirror 431 is reflected by the reflection mirror 433, and enters the liquid crystal light valve 451B via the field lens 701 and the incident-side polarizing plate 452.

  Green light from the color separation optical device 43 is supplied to the liquid crystal light valve 451G. Here, the green light reflected by the dichroic mirror 432 enters the liquid crystal light valve 451G via the field lens 701 and the incident-side polarizing plate 452.

  Red light from the color separation optical device 43 is supplied to the liquid crystal light valve 451B. Here, the red light transmitted through the dichroic mirror 432 passes through the relay optical device 44 (incident side lens 441, relay lens 443, reflecting mirrors 442 and 444), the field lens 701, and the incident side polarizing plate 452, and the liquid crystal light valve 451R. Is incident on.

  The cross dichroic prism 454 combines the color lights emitted from the emission-side polarizing plates 453 to form a color image. The cross dichroic prism 454 has a substantially 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 are emitted from the liquid crystal light valve 451G and transmit color light via the exit side polarizing plate 453, and are emitted from the liquid crystal light valves 451R and 451B and reflect each color light via the exit side polarizing plate 453. . In this way, the color lights are combined to form a color image.

  The projection lens 3 is configured as a combined lens in which a plurality of lenses are combined. The projection lens 3 enlarges and projects the color image formed by the cross dichroic prism 454.

  The cooling device 5 is connected to an air inlet 2 </ b> A formed at the bottom of the exterior housing 2 and the like. The cooling fan 50 sucks and discharges outside air into the exterior housing 2, and air sucked through the cooling fan 50. As a cooling air, and a duct 70 that circulates from the discharge port 50a to each liquid crystal light valve 451, and a filter 12 provided at the intake port. The duct 70 communicates with the discharge port 50a of the cooling fan 50.

  The duct 70 includes a first circulation part 71 connected to the cooling fan 50, a first exhaust part 72 that discharges gas toward the image forming system 45, and a second circulation part branched from the first exhaust part 72. 73 and a second exhaust part 74 that exhausts gas toward the illumination optical device 42.

  The first circulation part 71 is formed in a straight line so as to extend in one direction from the discharge port 50 a of the cooling fan 50 toward the image forming system 45. The first circulation part 71 circulates the gas supplied from the cooling fan 50 toward the first exhaust part 72. The first circulation part 71 has a connection part between the cooling fan 50 and the first circulation part 71 and a part of the first circulation part 71 from the discharge port 50a of the cooling fan 50 from the discharge direction to an exhaust port 80 to be described later. It is formed so as to bend in a direction orthogonal to the direction in which gas is discharged from. That is, the duct 70 has the curved portion 75a that is curved as described above. For this reason, the flow velocity of the gas flowing outside the curved portion 75a is larger than the flow velocity of the gas flowing inside.

  The first exhaust part 72 is disposed at a position overlapping the image forming system 45 in plan view. The first exhaust part 72 is disposed on the bottom surface side of the exterior housing 2 with respect to the image forming system 45. The first exhaust unit 72 supplies gas to the image forming system 45 from the bottom surface side to the ceiling side of the exterior housing 2.

  The second circulation part 73 is formed in a straight line so as to extend in one direction from the first exhaust part 72 toward the illumination optical device 42. The second circulation part 73 extends in a direction inclined with respect to the first circulation part 71. The second circulation part 73 circulates a part of the gas supplied to the first exhaust part 72 toward the second exhaust part 74.

  The second exhaust part 74 is disposed at a position overlapping the illumination optical device 42 in plan view. The second exhaust part 74 is disposed on the bottom surface side of the exterior housing 2 with respect to the illumination optical device 42. The second exhaust unit 74 supplies gas to the illumination optical device 42 from the bottom surface side to the ceiling side of the exterior housing 2.

  FIG. 2 is a perspective view showing the configuration of the cooling device 5. FIG. 3 is a plan view showing the configuration of the cooling device 5. FIG. 4 is a side view showing a configuration of the cooling device 5 (a partial cross section is shown). 2 to 4, a part of the cooling fan 50 is omitted.

  As shown in FIGS. 2 to 4, the first exhaust part 72 is formed in a rectangular box shape. The bottom 75 of the first exhaust part 72 is formed so as to bend toward the ceiling (the direction away from the bottom of the exterior housing 2) from the first circulation part 71 side to the second circulation part 73 side. The ceiling portion 76 of the first exhaust portion 72 is disposed to face the image forming system 45. The 1st exhaust part 72 has the hollow part 72a enclosed by the bottom part 75, the ceiling part 76, and the side part (not shown) which surrounds these. The hollow portion 72 a communicates with the first flow portion 71 and the second flow portion 73. For example, the discharge port 50a of the cooling fan 50, the inside of the first flow part 71, and the hollow part 72a are formed so that the dimensions in the width direction (direction perpendicular to the extending direction of the first flow part 71) are equal. ing. For this reason, the gas discharged from the discharge port 50a is guided linearly to the hollow portion 72a.

  The ceiling 76 is provided with an exhaust port 80R directed toward the liquid crystal light valve 451R, an exhaust port 80G directed toward the liquid crystal light valve 451G, and an exhaust port 80B directed toward the liquid crystal light valve 451B. The exhaust ports 80R, 80G, and 80B are each formed in a rectangular shape in plan view, and are disposed at positions that overlap the liquid crystal light valves 451R, 451G, and 451B.

  The exhaust ports 80R, 80G, and 80B are provided through the ceiling portion 76 so as to communicate between the outside of the first exhaust portion 72 and the hollow portion 72a. Therefore, the exhaust ports 80R, 80G, 80B are arranged in a region inside the hollow portion 72a in plan view. The gas flowing from the first flow part 71 into the hollow part 72a is discharged to the outside of the first exhaust part 72 through the exhaust ports 80R, 80G, 80B.

  The ceiling portion 76 has a guide portion 81R disposed at the edge of the exhaust port 80R, a guide portion 81G disposed at the edge of the exhaust port 80G, and a guide portion disposed at the edge of the exhaust port 80B. 81B. The guide parts 81R, 81G, 81B guide the gas discharged from the exhaust ports 80R, 80G, 80B toward the liquid crystal light valves 451R, 451G, 451B, respectively.

  The guide portions 81R, 81G, 81B extend from the ceiling portion 76 toward the liquid crystal light valves 451R, 451G, 451B. Therefore, the gas exhausted from the exhaust ports 80R, 80G, and 80B flows linearly toward the liquid crystal light valves 451R, 451G, and 451B, and the direction toward the liquid crystal light valves 451R, 451G, and 451B. Diffusion in different directions is regulated. Note that the guide portions 81R, 81G, 81B are arranged on, for example, two or more sides of the exhaust ports 80R, 80G, 80B, so that gas diffusion can be more effectively regulated.

  Of the exhaust ports 80R, 80G, and 80B, the exhaust port 80G (green exhaust port) directed to the liquid crystal light valve 451G that modulates green light has the largest opening area. Green light modulation is often performed more frequently than other light modulations. Therefore, the liquid crystal light valve 451G operates more frequently than the other liquid crystal light valves 451R and 451B, and the temperature is likely to rise. By making the opening area of the exhaust port 80G larger than the opening areas of the other exhaust ports 80R and 80B, the amount of gas supplied to the liquid crystal light valve 451G is increased compared to the other liquid crystal light valves 451R and 451B. Therefore, the cooling efficiency of the liquid crystal light valve 451G is higher than that of the other liquid crystal light valves 451R and 451B. Thus, by setting the cooling efficiency in accordance with the usage frequency of the liquid crystal light valves 451R, 451G, and 451B, it is possible to perform cooling with excellent balance.

  From the same point of view, for example, as shown in FIG. 3, the arrangement of the exhaust ports 80G in a plan view is arranged below the other exhaust ports 80R and 80B in the drawing. As described above, the connection portion between the cooling fan 50 and the first circulation portion 71 and a part of the first circulation portion 71 are formed to bend along the rotation direction of the cooling fan 50. The flow velocity of the gas flowing outside is larger than the flow velocity of the gas flowing inside. A similar flow velocity distribution is obtained for the gas flowing into the hollow portion 72a. The lower side in FIG. 3 corresponds to the outside of the curved portion, and is a portion where the gas flow velocity is larger than that in the upper side in FIG. Therefore, the exhaust port 80G communicates with a portion of the hollow portion 72a where the gas flow velocity is larger than that of the other exhaust ports 80R and 80B. For this reason, the amount of gas per unit time supplied to the liquid crystal light valve 451G can be increased compared to the other liquid crystal light valves 451R and 451B. Therefore, the cooling efficiency of the liquid crystal light valve 451G is higher than that of the other liquid crystal light valves 451R and 451B.

  As shown in FIGS. 2 to 4, the second exhaust part 74 is formed in a rectangular box shape like the first exhaust part 72, and has a hollow part (not shown) therein. . Although not shown, the bottom of the second exhaust part 74 is formed so as to bend toward the ceiling (in the direction away from the bottom of the exterior housing 2), like the bottom 75 of the first exhaust part 72. . The ceiling part 77 of the second exhaust part 74 is arranged to face the illumination optical device 42.

  The ceiling portion 77 is provided with an exhaust port 80P directed toward the illumination optical device 42 and a guide portion 81P disposed at the edge of the exhaust port 80P. The exhaust port 80P is disposed at a position overlapping the illumination optical device 42 in plan view. The exhaust port 80P is provided through the ceiling 77 so as to communicate between the outside of the second exhaust part 74 and the hollow part. The gas flowing from the second circulation part 73 into the hollow part of the second exhaust part 74 is exhausted to the outside of the second exhaust part 74 through the exhaust port 80P.

  Further, the guide portion 81P guides the gas discharged from the exhaust port 80P toward the illumination optical device 42. The guide portion 81P extends from the ceiling portion 77 toward the illumination optical device 42. For this reason, diffusion in a direction different from the direction toward the illumination optical device 42 is restricted so that the gas discharged from the exhaust port 80P flows linearly toward the illumination optical device 42. In addition, since the guide part 81P is arrange | positioned, for example in two or more sides among the exhaust ports 80P, it can control the spreading | diffusion of gas more effectively.

  When the projector 1 configured as described above is used, the polarization conversion element 423 and the image forming system 45 (the liquid crystal light valve 451, the incident side polarizing plate 452, the emission side polarizing plate 453) are generated by the light beam emitted from the optical device 4. ) Etc. generate heat. For example, when the liquid crystal light valve 451 generates heat and becomes a high temperature state, the liquid crystal malfunctions or the light valve deteriorates, which causes a problem that a good color image cannot be displayed due to the light modulation operation becoming defective. End up. In addition, when the illumination optical device 42 absorbs light and reaches a high temperature state, a polarization conversion defect occurs in the polarization conversion element 423.

  On the other hand, in the projector 1 having the above configuration, the liquid crystal light valve 451 and the polarization conversion element 423 are held at a certain temperature or lower by cooling the image forming system 45 and the illumination optical device 42 by the cooling device 5. .

  In this case, the gas supplied from the cooling fan 50 is guided to the exhaust ports 80R, 80G, 80B in one direction while the diffusion of the gas is regulated by the duct 70, so that the gas is efficiently supplied to the liquid crystal light valves 451R, 451G. , 451B. As a result, the liquid crystal light valves 451R, 451G, and 451B can be provided with the expected cooling efficiency even when the single cooling fan 50 is arranged instead of the conventional arrangement in which a plurality of cooling fans are arranged. Can be cooled. Thereby, it is possible to provide the projector 1 capable of ensuring the expected reliability while suppressing noise.

  In addition, according to the present embodiment, for the liquid crystal light valve 451G for green light that is likely to be used more frequently than the other liquid crystal light valves 451R and 451B in the projector 1, the exhaust gas directed to the liquid crystal light valve 451G. Since the opening 80G has a larger opening area than the other exhaust openings 80R and 80B, the cooling efficiency of the liquid crystal light valve 451G can be increased as compared with the other liquid crystal light valves 451R and 451B.

  Further, according to the present embodiment, since the portion from the cooling fan 50 to the duct 70 is provided to be curved, the flow velocity of the gas flowing outside the curved portion of the duct 70 is larger than the inside. In this case, since the exhaust port 80G directed to the liquid crystal light valve 451G is disposed at a position corresponding to the outside of the curved portion compared to the other exhaust ports 80R and 80B, the exhaust gas is exhausted to a position where the gas flow velocity is large. The mouth 80G is arranged. Thereby, since the flow velocity of the gas discharged from the exhaust port 80G can be increased, the cooling efficiency of the liquid crystal light valve 451G can be improved compared to the other liquid crystal light valves 451R and 451B.

  In addition, according to the present embodiment, since the duct 70 has the exhaust port 80P directed to the illumination optical device 42, the illumination optical device 42 including the polarization conversion element 423 as well as the liquid crystal light valves 451R, 451G, and 451B. Can also be cooled effectively. As a result, the reliability of the projector 1 is further improved.

  Further, according to the present embodiment, the gas discharged from the discharge ports 80R, 80G, and 80B is linearly directed toward the liquid crystal light valves 451R, 451G, and 451B while the diffusion is restricted by the guide portions 81R, 81G, and 81B. Therefore, the gas can be efficiently supplied to the liquid crystal light valves 451R, 451G, and 451B.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the shape of the exhaust ports 80R, 80G, 80B, and 80P in a plan view is a rectangular shape has been described as an example. A closed shape combining a circle, an ellipse, a polygon, a straight line and a curve, etc.).

  Moreover, although the structure which has the shape where the bottom part 75 of the duct 70 curved toward the ceiling part 76 was mentioned as an example, it demonstrated, it is not restricted to this. For example, the bottom portion 75 and the ceiling portion 76 may be parallel, or the bottom portion 75 may be inclined so as to approach the ceiling portion 76 linearly.

  In addition to the configuration of the above embodiment, for example, as shown in FIG. 5, the exhaust ports 80R, 80G, 80B and the guide portions 81R, 81G, 81B are formed on a plane arranged in the gas supply direction of the cooling fan 50. It may be a configured. In this case, since the gas supplied from the cooling fan 50 is discharged from the exhaust ports 80R, 80G, and 80B as it is, the straightness of the gas can be improved.

  Moreover, although the said embodiment gave and demonstrated the structure in which the 2nd flow part 73 and the 2nd exhaust part 74 which branch from the 1st exhaust part 72 were provided as an example, it is not restricted to this. For example, as shown in FIG. 6, the structure by which the 2nd circulation part 73 and the 2nd exhaust part 74 were abbreviate | omitted may be sufficient. In this case, since the flow velocity of the gas discharged from the exhaust ports 80R, 80G, and 80B increases, the straightness of the gas can be improved.

  In the above embodiment, the configuration in which the second circulation part 73 and the second exhaust part 74 are branched from the first exhaust part 72 has been described as an example, but the present invention is not limited to this. For example, as shown in FIG. 7, the first exhaust part 72 may have an exhaust port 80R, 80G, 80B and an exhaust port 80P.

  DESCRIPTION OF SYMBOLS 1 ... Projector 3 ... Projection lens 4 ... Optical apparatus 5 ... Cooling apparatus 42 ... Illumination optical apparatus 45 ... Image forming system 46 ... Optical component housing | casing 50 ... Cooling fan 70 ... Duct 71 ... 1st distribution part 72 ... 1st exhaust Part 73 ... Second distribution part 74 ... Second exhaust part 80R, 80G, 80B, 80P ... Exhaust port 81R, 81G, 81B, 81P ... Guide part 451 (451R, 451B, 451G) ... Liquid crystal light valve

Claims (6)

A light source device for emitting light;
A light modulation element that modulates light emitted from the light source according to image information;
A projection lens that projects the modulated light;
A cooling fan that discharges gas and supplies the gas from the discharge port to cool the light modulator;
A projector having an exhaust port that communicates with the discharge port and is directed to the light modulation unit, and that guides the gas from the discharge port to the exhaust port in one direction. The projector according to claim 1,
The light modulation element includes three light modulation elements that respectively modulate blue light, green light, and red light;
The exhaust port includes three exhaust ports for discharging the gas to each of the three light modulation elements. The projector according to claim 2,
Among the three exhaust ports, the green exhaust port directed to the light modulation element that modulates the green light has a larger opening area than the other two exhaust ports. The projector according to claim 3,
The duct has a curved portion that curves in a direction orthogonal to a direction in which the gas is discharged from the exhaust port from a direction in which the gas is discharged from the discharge port,
The green exhaust port is a projector disposed at a position corresponding to the outside of the curved portion with respect to the other two exhaust ports. The projector according to any one of claims 1 to 4, wherein:
An optical system for guiding the light emitted from the light source device to the light modulation element;
The duct is
A second flow part for flowing the air through the optical system;
A projector having a second exhaust port provided in the second circulation part and configured to exhaust the air toward the optical system. A projector according to any one of claims 1 to 5,
The said duct has a guide part which guides the gas discharged | emitted from the said exhaust port toward the said light modulation part.

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