JP2009133991A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of securing stable quality of a projection image, and efficiently cooling optical components. <P>SOLUTION: The projector includes: the optical component disposed inside a closed structure having an annular air flow path; and a circulating fan which circulates air. The closed structure includes: an optical component housing which accommodates the optical component inside; and a duct member which introduces air to the inside of the optical component housing, and introduces the air having flowed to the outside from the inside of the optical component housing again toward the inside of the optical component housing. The duct member includes a fan accommodating part 95 which accommodates a sirocco fan inside. The fan accommodating part 95 is provided with a partition wall part 951 projecting to the inside to abut on the outer surface of a fan housing 935, and dividing space outside the fan housing 935 to first space Sp1 on a rotor 933 side and second space Sp2 on a stator 934 side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector.

Conventionally, a projector including a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information to form image light, and a projection optical device that enlarges and projects the image light is known. Yes.
In this projector, when dust, oily smoke, or the like adheres to the surface of the light modulation device, the image quality of the projected image deteriorates. In addition, since a light modulation device such as a liquid crystal panel is generally vulnerable to heat, heat deterioration may occur due to heat generated by irradiation of a light beam from a light source device.
Therefore, in order to secure the image quality of the projected image stably and cool the light modulator efficiently, the light modulator and centrifugal fan (sirocco fan) are placed inside the sealed structure, and the air inside the sealed structure is sirocco A structure that circulates with a fan has been proposed (see, for example, Patent Document 1).

JP 2000-298311 A

However, in the structure described in Patent Document 1, since the entire sirocco fan is disposed inside the sealed structure, the sirocco fan itself becomes a heat source in addition to the optical components to be cooled, and the temperature of the air inside the sealed structure The structure is easy to rise. That is, it is difficult to efficiently cool an optical component such as a light modulation device.
Therefore, there is a demand for a technique that can ensure the image quality of a projected image stably for a long period of time and can efficiently cool an optical component such as a light modulation device.

  An object of the present invention is to provide a projector capable of stably securing the image quality of a projected image and efficiently cooling an optical component.

  The projector of the present invention is a projector including an optical component disposed inside a sealed structure having an annular air flow passage that allows air to flow, and a sirocco fan that circulates air in the annular air flow passage. The sealed structure accommodates the optical component inside, and has an inflow port for allowing air to flow in and an outflow port for flowing air to the outside, and the inflow port. Air is introduced into the optical component casing through the air outlet, and the air that has flowed out of the optical component housing through the outlet is returned to the optical component casing through the inlet. The sirocco fan includes a rotor having a plurality of blades, a stator that rotatably supports the rotor about a predetermined rotation axis, and the stator And the fan housing having a suction port for the rotor to take in air and a discharge port for discharging the air to the outside, and the stator and the rotor. Are arranged along the rotation axis, and the duct member includes a fan housing portion for housing the sirocco fan therein. The fan housing portion projects inward and abuts on the outer surface of the fan housing. A partition wall is provided for partitioning a space outside the fan housing into a first space on the rotor side and a second space on the stator side.

  Here, examples of the stator include a coil and a circuit board on which a driver circuit for energizing the coil is mounted.

  In the present invention, since optical components such as a light modulation device are housed inside the optical component casing constituting the sealed structure, it is possible to prevent dust, oily smoke, and the like from adhering to the optical components and to be projected from the projector. The image quality of the projected image can be secured stably for a long time.

By the way, when the sirocco fan is driven, a circuit element such as a driver circuit mounted on the circuit board generates heat. And the heat of a circuit element is transmitted to the end surface at the side of a stator in a fan housing. Furthermore, the air outside the fan housing on the stator side is warmed by the transmitted heat, and flows through the outside of the fan housing to the rotor side.
In the present invention, the duct member constituting the hermetic structure includes a fan housing portion, and the fan housing portion has a space outside the fan housing as a first space on the rotor side and a second space on the stator side. A partition wall for partitioning is provided. As a result, even if heat is transmitted to the end face on the stator side of the fan housing due to the heat generation of the circuit element, the heat on the end face on the stator side is retained in the second space, and the rotor side, that is, the suction port Transmission to the first space on the side can be suppressed. That is, the heat of the end face on the stator side in the fan housing can be suppressed from being transmitted to the air circulating through the air flow passage through the suction port and the discharge port, and the temperature of the air inside the sealed structure by the sirocco fan Can be suppressed. For this reason, an optical component can be cooled efficiently.

In the projector according to the aspect of the invention, it is preferable that the partition wall portion is provided outside the outer shape of the stator when viewed from the suction port side.
By the way, the heat of the circuit element is most transferred to a region facing the stator (circuit board) (hereinafter referred to as a facing region) on the end surface on the stator side of the fan housing.
In this invention, since the partition part is provided as mentioned above, the space which the opposing area | region can contact can be reliably made into 2nd space. For this reason, the heat transmitted to the fan housing due to the heat generated by the circuit elements can be reliably retained in the second space, and the transfer to the first space can be further suppressed.

In the projector according to the aspect of the invention, a plurality of the partition walls may be provided, and the space outside the fan housing may be divided into the first space, the second space, the first space, and the second space. It is preferable to partition into a third space interposed therebetween.
Here, the third space is not limited to one and may be two or more.
In the present invention, the space outside the fan housing is partitioned into first to third spaces by the plurality of partition walls. That is, by providing the third space between the first space and the second space, heat transfer from the second space to the first space can be effectively suppressed. In particular, since the air layer has a high heat insulating effect, heat transfer from the second space to the first space can be effectively suppressed by the air layer in the third space.

In the projector according to the aspect of the invention, it is preferable that a plurality of the sealing structures are provided so as to have independent air flow passages, and each of the fan housing portions constituting the plurality of sealing structures is integrally formed. .
In this invention, each fan accommodating part which comprises several sealing structure is formed integrally. As a result, a seal member or the like for ensuring the hermeticity of each fan housing can be shared. For this reason, for example, compared with a configuration in which a sealing member is used for each fan housing portion without integrally forming each fan housing portion, the sealing performance of each sealing structure can be ensured more reliably. The assembly efficiency when assembling can also be improved.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[Appearance structure]
FIG. 1 is a perspective view showing an appearance of a projector 1 according to this embodiment. Specifically, FIG. 1 is a perspective view of the projector 1 as viewed from the upper front side.
In the following, for convenience of explanation, the left when viewed from the front is described as “left”, and the right when viewed from the front is described as “right”.
The projector 1 modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects the formed image light on a screen (not shown). The projector 1 includes an exterior housing 2 that constitutes an exterior.

  The exterior housing 2 is a housing made of synthetic resin and houses the apparatus main body of the projector 1. As shown in FIG. 1, the outer casing 2 includes an upper case 21 that covers an upper part of the apparatus main body, a part of the front part, a part of the side part, and a part of the rear part, and a lower part of the apparatus main body. A lower case 22 covering a part of the front part, a part of the side part, and a part of the back part.

[Internal configuration]
2 and 3 are perspective views showing the internal configuration of the projector 1. FIG. Specifically, FIG. 2 is a perspective view showing a state where the upper case 21 is removed from the state of FIG. FIG. 3 is a perspective view showing a state in which the control board 5 is removed from the state of FIG.
As shown in FIG. 2 or FIG. 3, the main body of the projector 1 is accommodated in the exterior housing 2. The apparatus main body includes an optical unit 3, a power supply unit 4, a control board 5 (FIG. 2), a housing internal cooling device 6, and a sealed circulation air cooling unit 7 (FIG. 3).

[Configuration of optical unit]
4 to 6 are diagrams showing the configuration of the optical unit 3. Specifically, FIG. 4 is a perspective view of the optical unit 3 as viewed from the upper rear side. FIG. 5 is a perspective view of the optical unit 3 as viewed from the front lower side. FIG. 6 is a plan view schematically showing the optical system of the optical unit 3.
The optical unit 3 forms image light according to image information under the control of the control board 5, and extends from the front side to the back side of the exterior housing 2, and the front end portion in the extending direction is on the right side. Further, it has a substantially U-shape in plan view that extends and bends toward the front side.

As shown in FIG. 6, the optical unit 3 includes a light source device 31 having a light source lamp 311 and a reflector 312, an illumination optical device having lens arrays 321 and 322, a polarization conversion element 323, a reflection mirror 324, and a superimposing lens 325. 32, a color separation optical device 33 having dichroic mirrors 331 and 332, and a reflection mirror 333, an incident side lens 341, a relay lens 343, and a relay optical device 34 having reflection mirrors 342 and 344, and a light modulation device Three liquid crystal panels 351 (red light side liquid crystal panel 351R, green light side liquid crystal panel 351G, blue light side liquid crystal panel 351B), three incident side polarizing plates 352, three outgoing side polarizing plates 353, and a cross dichroic prism 354 as a color synthesis optical device It comprises an optical system 35 having an optical component housing 36, and a projection lens 37 as a projection optical device.
The optical components 31 to 35 and 37 described above are used as optical systems for various general projectors, and thus will not be described in detail. Hereinafter, the configuration of the optical component casing 36 will be described. Will be explained.

  As shown in FIG. 4 or FIG. 5, the optical component housing 36 has a substantially U shape in plan view, in which a predetermined illumination optical axis A (FIG. 6) is set, and each of the optical components 31 described above. To 35 are arranged at predetermined positions with respect to the illumination optical axis A. The optical component housing 36 includes a component storage member 361 and a lid-like member 362.

The component storage member 361 includes a light source device storage unit 3611 and a component storage unit main body 3612.
The light source device storage portion 3611 is located in one end of the U-shape of the optical component housing 36 and is formed in a container shape having an opening 3611A (FIG. 5) on the lower side. The light source device 31 is accommodated in the light source device accommodating portion 3611 through the opening 3611A.

The component storage unit main body 3612 is formed in a container shape having an opening (not shown) on the upper side. The component storage unit main body 3612 stores the optical components 32 to 34 in order from one end side connected to the light source device storage unit 3611 through the opening, and the other end opposite to the one end side. The optical device 35 is accommodated on the side. In addition, a projection lens 37 is attached to the side of the component storage unit main body 3612 that faces the optical device 35.
In the component storage unit main body 3612, openings 3612R, 3612G, and 3612B (FIG. 5) are formed on the lower end surface at positions corresponding to the arrangement positions of the liquid crystal panels 351R, 351G, and 351B constituting the optical device 35, respectively. Has been.
In the component storage unit main body 3612, an opening 3612 </ b> P (FIG. 5) is formed on the lower end surface at a position corresponding to the position where the polarization conversion element 323 is arranged.
Each of the openings 3612R, 3612G, 3612B, and 3612P includes a space Ar1 (FIGS. 4 and 6) in which the optical device 35 is disposed in the optical component housing 36, and a space Ar2 (in which the polarization conversion element 323 is disposed). 4 and 6) functions as an inflow port through which air flows.

The lid-like member 362 is a member that closes the opening on the upper side of the component storage unit main body 3612, and has a planar shape substantially the same as the planar shape of the component storage unit main body 3612.
The lid-like member 362 is formed with a U-shaped notch 3621 (FIG. 4) corresponding to the arrangement position of the optical device 35 so as to surround the optical device 35 in a plan view.
In addition, an opening 3622 (FIG. 4) is formed in the lid-like member 362 corresponding to the arrangement position of the polarization conversion element 323.
The notch 3621 and the opening 3622 allow the air that has flowed into the spaces Ar1 and Ar2 inside the optical component housing 36 through the openings 3612R, 3612G, 3612B, and 3612P described above to the outside of the optical component housing 36. It functions as an outlet for discharging.

  Although illustration is omitted, inside the optical component housing 36, the space Ar1 is formed by another optical component such as a rib formed on the component storage unit main body 3612, an incident side polarizing plate 352, and the like. It is configured not to communicate with the space. Similarly, in the optical component housing 36, the space Ar2 communicates with other adjacent spaces by the ribs formed in the component storage unit main body 3612 and the optical components such as the lens array 322 and the superimposing lens 325. It is configured not to.

[Configuration of power supply unit]
The power supply unit 4 supplies electric power to each constituent member constituting the apparatus main body of the projector 1. As shown in FIG. 2 or 3, the power supply unit 4 is disposed so as to extend from the back side to the front side along the left side surface of the exterior housing 2. The periphery of the power supply unit 4 is covered with a shield member 41 made of metal such as aluminum whose front side and back side are opened.

[Configuration of control board]
As shown in FIG. 2, the control board 5 is configured as a circuit board on which circuit elements such as a CPU (Central Processing Unit) are mounted, and each downstream duct member 81, 91, which will be described later, of the hermetic circulation air-cooling unit 7. And disposed above the optical unit 3. The control board 5 controls the operation of each constituent member constituting the projector 1.

[Configuration of internal cooling device]
FIG. 7 is a perspective view showing a configuration of the housing internal cooling device 6. Specifically, FIG. 7 is a perspective view as seen from the upper rear side.
The casing internal cooling device 6 cools the respective constituent members (the control board 5, the light source device 31, the power supply unit 4, etc.) arranged outside the optical component casing 36 inside the exterior casing 2. As shown in FIG. 7, the housing internal cooling device 6 includes an intake unit 61, a relay duct 62, a power supply cooling fan 63, and an exhaust unit 64.

  The intake unit 61 is disposed in a corner portion on the right rear surface side in the exterior housing 2, and via a first intake port (not shown) formed on the rear surface side of the right side surface portion in the exterior housing 2. Then, cooling air outside the exterior casing 2 is introduced into the interior. The intake unit 61 includes an intake side duct 611 that introduces cooling air Air via the first intake port, and an intake fan 612 that discharges the cooling air Air introduced via the intake side duct 611 to the back side. .

The relay duct 62 has a substantially rectangular parallelepiped shape with one end connected to the discharge port of the intake fan 612 and extending to the back side of the power supply unit 4 along the back side of the exterior housing 2. And the relay duct 62 distribute | circulates the air discharged from the intake fan 612 from the right side surface side to the left side surface side in the exterior housing | casing 2 following the flow path C11.
In the relay duct 62, although not shown in the drawing on the front end surface, two opening portions for disposing a part of the hermetic circulation air cooling unit 7 are arranged in parallel in the left-right direction. It is formed to do.

Further, in the relay duct 62, a cooling opening 621 for discharging a part of the air flowing along the flow path C11 to the upper side of the opening on the right side is disposed on the front end face. (FIGS. 2, 3, and 7) are formed.
The cooling opening 621 is formed so as to extend in the left-right direction, and the height position of the cooling opening 621 is the first downstream duct described later of the control board 5 and the hermetic circulating air-cooling unit 7 with the relay duct 62 incorporated therein. It is located between the upper end surface of the member 81. The air exhausted through the cooling opening 621 flows along the flow path C12 between the control board 5 and the upper end surface of the first downstream duct member 81, and the control board 5 and the second The upper side end face of the first downstream duct member 81 is cooled.

  The power cooling fan 63 is disposed on the back side of the power supply unit 4 and is connected to the other end of the relay duct 62. The power cooling fan 63 discharges the air sucked through the relay duct 62 toward the power supply unit 4. The air discharged from the power cooling fan 63 is introduced into the shield member 41 from the opening on the back side of the shield member 41, flows along the flow path C 13 communicating between the inside and outside of the shield member 41, and flows through the power supply unit 4. The constituent circuit elements are cooled.

  The exhaust unit 64 is disposed at a corner portion on the left front side inside the exterior casing 2, and passes through the exhaust port 201 (FIG. 1) formed on the left side of the front portion of the exterior casing 2. 2 Exhaust the air inside. This exhaust unit 64 is discharged from the exhaust fan 641 through the exhaust port 641 and the exhaust fan 641 that sucks and discharges internal air (air that has passed through the flow paths C12 and C13, air in the vicinity of the light source device 31). And an exhaust side duct 642 for discharging the air to the outside of the exterior housing 2.

[Configuration of sealed circulation air cooling unit]
8 to 10 are perspective views showing the configuration of the hermetic circulation air-cooling unit 7. Specifically, FIG. 8 is a perspective view of the state attached to the optical unit 3 as seen from the upper rear side. FIG. 9 is a diagram illustrating a state in which the first downstream duct member 81, the heat exchanger 85, the cover member 912, and the heat dissipation device 94 are removed from the state of FIG. FIG. 10 is a perspective view of the upstream duct members 83 and 92 as viewed from the upper rear side.
In FIG. 8, for convenience of explanation, the cover member 812 (FIG. 7) is omitted. In FIG. 10, the optical device 35 is illustrated in order to show the positional relationship with the optical device 35 (excluding the incident-side polarizing plate 352).
The sealed circulation air cooling unit 7 constitutes a sealed structure according to the present invention together with the optical component casing 36. As shown in FIG. 8, the hermetic circulation air cooling unit 7 includes a first air cooling unit 8 and a second air cooling unit 9.

[Configuration of second air cooling unit]
The second air-cooling unit 9 constitutes a second sealed structure together with the optical component casing 36, and circulates air in the second air flow passage inside the second sealed structure, so that the optical component casing is circulated. The polarization conversion element 323 arranged in the space Ar2 in 36 is cooled. As shown in FIGS. 8 to 10, the second air cooling unit 9 includes a second downstream duct member 91 (FIGS. 8 and 9), a second upstream duct member 92, and a second circulation. A fan 93 (FIG. 10) and a heat dissipation device 94 (FIG. 8) are provided.
Hereinafter, along the second air flow passage, the upstream with respect to the space Ar2 will be referred to as “upstream” and the downstream with respect to the space Ar2 will be referred to as “downstream”, and will be described in order from the downstream side.

The second downstream duct member 91 is a member that guides air that has flowed out of the space Ar <b> 2 in the optical component housing 36 to the second upstream duct member 92. As shown in FIG. 8 or FIG. 9, the second downstream duct member 91 includes an L-shaped duct portion 911 and a cover member 912 (FIG. 8).
As shown in FIG. 9, the L-shaped duct portion 911 corresponds to the outer surface shape in the vicinity of the position where the polarization conversion element 323 is disposed in the optical component housing 36, and from the upper side of the space Ar <b> 2 to the upper side of the lid-like member 362. It is formed in an L shape having a horizontal portion 9111 extending toward the back side along the end surface and a vertical portion 9112 extending downward along the back surface of the optical component housing 36.

Here, in the horizontal portion 9111, a communication port 9111 </ b> A that communicates with the space Ar <b> 2 through the opening 3622 is formed on the lower end surface at a position corresponding to the opening 3622 of the optical component housing 36.
Further, in the horizontal portion 9111, an opening portion 9111B extending from the position that interferes with the communication port 9111A in a plane is formed on the upper end surface.
Two notches 9111C are formed at the edge on the back side of the opening 9111B.

The cover member 912 is a plate-like member that closes the opening 9111B of the L-shaped duct portion 911.
As the projector 1 is assembled, the air that flows out from the space Ar2 in the optical component casing 36 is introduced into the L-shaped duct portion 911 through the communication port 9111A, as shown in FIG. The flow follows the flow path C21 of the horizontal portion 9111 to the vertical portion 9112 and is discharged downward from the vertical portion 9112.

The second upstream duct member 92 is disposed below the optical component casing 36, and the air flowing along the flow path C <b> 21 inside the second downstream duct member 91 is supplied to the optical component casing 36. This is a member that leads to the space Ar2. As shown in FIG. 10, the second upstream duct member 92 includes a second air introduction portion 921, a cover member 11, and a base member 12.
The second air introduction part 921 is a part that is connected to the vertical part 9112 and into which the air that has circulated along the flow path C21 is introduced into the second upstream duct member 92. As shown in FIG. 10, the second air introduction portion 921 is formed in a container shape having a concave portion 9211 having a substantially square shape in plan view that is recessed upward, and the opening side of the container shape is attached to the base member 12.
A communication port 9212 is formed in the bottom portion of the concave portion 9211. The communication port 9212 has a substantially triangular shape corresponding to the outer shape of the vertical portion 9112 and introduces air that has circulated along the flow path C21.

The base member 12 is a member that is used in common with a later-described first upstream duct member 83 that constitutes the first air-cooling unit 8, and in the following, the base member 12 has a substantially square shape in plan view on the left side. Only the region 13 (hereinafter referred to as the second base portion 13) will be described.
The 2nd base part 13 is formed in the container shape which has the storage recessed part 131 and the discharge | emission side recessed part 132 which were hollow upward and connected mutually.
The housing recess 131 has a substantially square shape in plan view, and the second circulation fan 93 is housed therein, and the second air introduction portion 921 is attached to the outer surface of the bottom portion.

Here, although the specific configuration of the second circulation fan 93 will be described later, the second circulation fan 93 is configured by a sirocco fan and circulates air along the second air flow path inside the second hermetic structure. The second circulation fan 93 is housed in the housing recess 131 such that the suction port 931 faces upward and the discharge port 932 (see FIG. 11) faces the front side.
In the storage recess 131, a substantially circular opening 1311 is formed at a position facing the suction port 931.

  The discharge-side recess 132 corresponds to the position where the polarization conversion element 323 is disposed, is provided on the front side of the storage recess 131, and bulges upward from the storage recess 131. A communication port 132P that corresponds to the opening 3612P of the optical component housing 36 and communicates with the space Ar2 through the opening 3612P is formed at the bottom of the discharge-side recess 132.

Similarly to the base member 12, the cover member 11 is a member used in common with a first upstream duct member (to be described later) constituting the first air cooling unit 8, and is a member of the base member 12 (second base portion 13). It is a plate-like member that closes the opening portion on the lower side.
That is, the 2nd base part 13 and the cover member 11 are corresponded to the fan accommodating part which concerns on this invention. In the following description, for convenience of explanation, a fan housing portion constituted by the second base portion 13 and the cover member 11 is described as a second fan housing portion 95 (see FIG. 12). The internal structure of the second fan storage unit 95 will be described later.
As the projector 1 is assembled, the air flowing out from the second downstream duct member 91 is introduced into the second air introduction portion 921 through the communication port 9212 as shown in FIG. Then, after following the flow path C22 from the second air introduction portion 921 to the storage recess portion 131 (second circulation fan 93) to the discharge side recess portion 132, it is introduced into the space Ar2 through the communication port 132P and the opening portion 3612P. .

That is, the above-described flow paths C21 and C22 and the space Ar2 constitute an annular second air flow passage inside the second sealed structure. Then, the second circulation fan 93 causes the air to flow along the annular second air flow path of the flow path C21 to the flow path C22 to the space Ar2 to the flow path C21, thereby allowing the polarization conversion element in the space Ar2 to flow. 323 is cooled.
Although not specifically shown, the optical component housing 36 and the second air cooling unit 9 are configured such that, for example, an elastic seal member or the like is interposed between the members so that the second air circulation is performed. It forms a sealed structure where the road and the outside do not communicate.

The heat radiating device 94 is a device that receives the heat of air that follows the flow path C21 inside the second sealed structure and radiates the heat to the outside of the second sealed structure. As shown in FIG. 8, the heat dissipation device 94 includes two heat pipes 941 and a heat dissipation member 942.
The two heat pipes 941 are bent so as to be L-shaped. The heat pipe 941 is disposed inside the second downstream duct member 91 through a notch 9111C formed in the second downstream duct member 91 at one end, and is connected to the inner surface of the cover member 912. .
Here, although not specifically illustrated, the inner surface of the cover member 912 has a plurality of fin members made of a heat conductive material such as metal, and receives the heat of air following the flow path C21. A heat receiving member is provided.
The two heat pipes 941 have one end connected to the heat receiving member so as to be able to transfer heat, and the other end connected to the heat radiating member 942 so that heat can be transferred. That is, the two heat pipes 941 guide the heat transferred from the air that follows the flow path C21 to the heat receiving member from the inside of the second sealed structure to the outside and transmit the heat to the heat radiating member 942.

The heat dissipating member 942 is disposed on the back side of the exterior housing 2 and dissipates heat transferred through the heat pipe 941. The heat dissipating member 942 has a plurality of plate-like fin members made of a heat conductive material such as metal, and has a configuration in which the heat dissipating members 942 are stacked in the vertical direction in parallel with each other. The other end of the two heat pipes 941 passes through the fin members from the upper side to the lower side, and is connected to the fin members so as to be able to transfer heat.
The heat radiating member 942 is disposed inside the relay duct 62 through the arrangement opening of the relay duct 62 in a state where the projector 1 is assembled. Therefore, the heat transmitted to the heat radiating member 942 along the heat transfer path of the heat receiving member to the two heat pipes 941 to the heat radiating member 942 is cooled by the air flowing along the flow path C11 inside the relay duct 62. The

[Configuration of the first air cooling unit]
The first air-cooling unit 8 constitutes a first sealed structure together with the optical component casing 36, and circulates air in the first air flow passage inside the first sealed structure to circulate the optical component casing 36. The optical device 35 disposed in the space Ar1 is cooled. As shown in FIGS. 8 to 10, the first air cooling unit 8 includes a first downstream duct member 81 (FIG. 8), a connection duct member 82 (FIG. 9), and a first upstream duct member. 83, a first circulation fan 84 (FIG. 10), and a heat exchanger 85 (FIG. 8).
In the following, along the first air flow passage, the upstream with respect to the space Ar1 is referred to as “upstream” and the downstream with respect to the space Ar1 is referred to as “downstream”, and will be described in order from the downstream side.

The first downstream duct member 81 is a member that guides air that has flowed out of the space Ar <b> 1 in the optical component housing 36 to the connection duct member 82. As shown in FIG. 8, the first downstream duct member 81 includes a duct body 811 and a cover member 812 (FIG. 7).
The duct body 811 extends from the upper side of the space Ar1 to the back side along the upper end surface of the lid-like member 362, and is formed in a container shape having an opening 8111 on the upper side.
In the duct body 811, a communication port 8112 that communicates with the space Ar <b> 1 through the notch 3621 is formed on the lower end surface at a position corresponding to the notch 3621 of the lid-like member 362.
Further, in the duct body 811, a rectangular communication port 8113 for discharging internal air to the outside is formed on the back side of the lower end face.

The cover member 812 is a plate-like member that closes the opening 8111 of the duct body 811.
Further, as shown in FIG. 7, the cover member 812 is provided with holes 8121 through which the FPC cables 351 </ b> A that connect the liquid crystal panels 351 and the control board 5 are passed. And the clearance gap between each hole 8121 and each FPC cable 351A is sealed with rubber | gum, sponge, etc. so that the sealing property inside the 1st downstream duct member 81 may not be impaired.

  As the projector 1 is assembled, the air that flows out from the space Ar1 in the optical component housing 36 is introduced into the duct body 811 through the communication port 8112 as shown in FIG. It traces C31, distribute | circulates to the back side, and is discharged | emitted toward the downward side through the communicating port 8113. FIG.

The connection duct member 82 is disposed on the back side of the optical component casing 36, and is provided with a heat exchanger 85, and air circulated along the flow path C31 inside the first downstream duct member 81. It is a member that leads to the first upstream duct member 83.
As shown in FIG. 9, the connecting duct member 82 has a substantially U-shaped cross section extending in the vertical direction, and is disposed so that an opening portion having a U-shaped cross section faces the back side. The connection duct member 82 has a heat exchanger 85 installed in an opening portion having a U-shaped cross section, and the opening portion is closed by the heat exchanger 85, so that air can flow in the vertical direction. C32 is formed.
Then, by assembling the projector 1, the upper end portion of the connection duct member 82 is connected to the peripheral portion of the communication port 8113 of the first downstream duct member 81, and from the first downstream duct member 81 to the outside. The outflowed air follows the flow path C32 and is discharged downward.

The first upstream duct member 83 is disposed on the lower side of the optical component casing 36, and the air that flows along the flow path C <b> 32 inside the connection duct member 82 enters the space Ar <b> 1 in the optical component casing 36. It is a member to guide. The first upstream duct member 83 includes a first air introduction portion 831, a cover member 11, and a base member 12.
The first air introduction portion 831 is a portion that is connected to the lower end portion of the connection duct member 82, and the air that has circulated along the flow path C <b> 32 is introduced into the first upstream duct member 83. As shown in FIG. 10, the first air introduction portion 831 is formed in a container shape having a concave portion 8311 having a substantially elliptical shape in plan view that is recessed upward, and the opening side of the container shape is attached to the base member 12.
A communication port 8312 is formed in the bottom portion of the recess 8311. The communication port 8312 has a substantially rectangular shape corresponding to the outer shape of the connection duct member 82, and introduces air circulated along the flow path C32. .

Since the base member 12 is a member used in common with the first air-cooling unit 8 as described above, hereinafter, the left-side planar portion 14 of the base member 12 (hereinafter referred to as the first air-cooling unit) is referred to as the first air-cooling unit 8. Only the base portion 14 will be described.
The first base portion 14 is formed integrally with the second base portion 13 and is formed in a container shape having a storage recess 141 and a discharge-side recess 142 that are recessed upward and communicate with each other.
The storage recess 141 has a substantially rectangular shape in plan view, and stores the first circulation fan 84 (841, 842) in a state of being juxtaposed in the left-right direction, and introduces the first air into the outer surface of the bottom portion. Part 831 is attached.

Here, the first circulation fan 84 circulates air along the annular first air flow passage inside the first hermetic structure, although a specific configuration will be described later. A sirocco fan 841 and an RG sirocco fan 842 are included. The B sirocco fan 841 is housed in the housing recess 141 so that the suction port 8411 faces upward and the discharge port (not shown) faces the front side. Further, the RG sirocco fan 842 is housed inside the housing recess 141 with the suction port 8421 facing upward and the discharge port (not shown) inclined from the front side to the left side.
In the storage recess 141, substantially circular openings 1411 and 1412 are formed at positions corresponding to the suction ports 8411 and 8421.

  The discharge side recess 142 corresponds to the arrangement position of the optical device 35, is provided on the front side of the storage recess 141, and bulges upward from the storage recess 141. The bottom of the discharge-side recess 142 corresponds to the openings 3612R, 3612G, and 3612B of the optical component housing 36, and communicates with the space Ar1 through the openings 3612R, 3612G, and 3612B. , 142G, 142B are formed.

The cover member 11 closes an opening portion on the lower side of the second base portion 13 in the base member 12 and closes an opening portion on the lower side of the first base portion 14.
That is, the 1st base part 14 and the cover member 11 are equivalent to the fan accommodating part which concerns on this invention. In the following description, for convenience of explanation, the fan housing portion constituted by the first base portion 14 and the cover member 11 is described as a first fan housing portion 86 (see FIG. 12). The internal structure of the first fan housing part 86 will be described later.
As the projector 1 is assembled, the air that flows out from the connection duct member 82 is introduced into the first air introduction part 831 through the communication port 8312 as shown in FIG. One air inlet 831 is branched into two.
One air branched inside the first air introduction part 831 follows the flow path C33B from the first air introduction part 831 to the storage concave part 141 (B sirocco fan 841) to the discharge side concave part 142, It is introduced into the space Ar1 through the communication port 142B and the opening 3612B.

The other air branched inside the first air introduction part 831 traced the flow path C33RG from the first air introduction part 831 to the storage recess 141 (RG sirocco fan 842) to the discharge side recess 142. Then, it branches into two inside the discharge side recess 142.
One air branched inside the discharge side recess 142 is introduced into the space Ar1 through the communication port 142R and the opening 3612R.
The other air branched inside the discharge-side recess 142 is introduced into the space Ar1 via the communication port 142G and the opening 3612G.

That is, the above-described flow paths C31, C32, C33B, C33RG and the space Ar1 constitute an annular first air flow passage inside the first sealed structure. The first circulation fan 84 causes the air in the space Ar1 to flow by following the annular first air flow path of the flow paths C31 to C32 to C33B, C33RG to the space Ar1 to the flow path C31. The device 35 (liquid crystal panel 351, incident side polarizing plate 352, emission side polarizing plate 353, etc.) is cooled.
Although not specifically shown, the optical component housing 36 and the first air-cooling unit 8 have the first air flow, for example, by interposing an elastic seal member between the members. It forms a sealed structure where the road and the outside do not communicate.

The heat exchanger 85 is a device that is installed in the connecting duct member 82, receives the heat of air that follows the flow path C32 inside the first sealed structure, and dissipates heat to the outside of the first sealed structure.
The heat exchanger 85 is installed in an opening portion having a U-shaped cross section of the connection duct member 82, so that the front side portion is disposed inside the connection duct member 82. And the heat exchanger 85 receives the heat of the air which follows the flow path C32 in the site | part on the front side, and transmits it to the site | part on the back side.
Further, in the heat exchanger 85, the rear side portion is arranged inside the relay duct 62 through the arrangement opening of the relay duct 62 in a state where the projector 1 is assembled. For this reason, in the heat exchanger 85, the heat transferred from the front side portion to the back side portion is cooled by the air flowing along the flow path C11 inside the relay duct 62.

[Circulation fan structure]
Next, the detailed structure of the circulation fans 84 and 93 will be described.
FIG. 11 is a view for explaining the structure of the second circulation fan 93. Specifically, FIG. 11A is a view of the second circulation fan 93 viewed from the suction port 931 side. FIG. 11B is a cross-sectional view taken along line II of FIG.
In FIG. 11, for convenience of explanation, a plurality of blades provided on the rotor 933 are omitted. The same applies to the following drawings.
Since the circulation fans 84 and 93 have the same structure, only the structure of the second circulation fan 93 will be described below.
As shown in FIG. 11, the second circulation fan 93 includes a rotor 933, a stator 934, and a fan housing 935.

The rotor 933 is rotatably supported with respect to the stator 934. The rotor 933 includes a rotor body 9331 and a plurality of blades.
The rotor body 9331 has a bottomed cylindrical shape that covers the upper side of the stator 934.
In the rotor main body 9331, a columnar shaft portion 9331A that protrudes downward along a rotation axis Ax that the rotor 933 rotates with respect to the stator 934 is formed at a substantially central portion of the bottom portion.
Further, in the rotor main body 9331, a cylindrical magnet (permanent magnet) 9331B magnetized in multiple poles is fitted and fixed to the inner peripheral portion along the circumferential direction around the rotation axis Ax.
The plurality of blades all have the same shape and are formed so as to protrude outward from the outer periphery of the rotor body 9331.

The stator 934 is fixed to the bottom surface of the fan housing 935. The stator 934 includes a holder 9341, a coil 9342, a yoke 9343, and a circuit board 9344.
The holder 9341 has a cylindrical shape that allows the shaft portion 9331A to be inserted, and rotatably supports the rotor 933 about the rotation axis Ax. The holder 9341 supports the coil 9342 and the yoke 9343 on the outer surface.
The coil 9342 is a portion wound around the outer periphery of the holder 9341 and energized by the circuit board 9344.
The yoke 9343 is supported by the holder 9341 so as to surround the coil 9342 and is magnetized in multiple poles along the circumferential direction around the rotation axis Ax by energizing the coil 9342.

  The circuit board 9344 is a circular circuit board in plan view on which a driver circuit for energizing the coil 9342, a hall sensor for detecting the polarity of the cylindrical magnet 9331B, and the like are mounted. The circuit board 9344 is supplied with electric power from the outside via a lead wire, and appropriately changes the energization to the coil 9342 (performs normal energization and reverse energization) to rotate the rotor 933 (the number of rotations). Etc.). The circuit board 9344 is fixed to the proximal end portion of the holder 9341.

  As described above, the rotor 933 and the stator 934 are stacked along the rotation axis Ax.

The fan housing 935 houses the rotor 933 and the stator 934 therein. The fan housing 935 includes a housing body 9351 and a lid 9352.
The housing body 9351 is formed in a container shape, and the base end portion of the stator 934 (holder 9341) is fixed to the bottom portion.
A part of the side surface portion of the housing main body 9351 is cut out. Then, the lid 9352 is combined with the housing body 9351 so that the cutout portion and the lid 9352 form the discharge port 932.
The lid 9352 is a portion attached to the container-like opening portion (rotor 933 side) of the housing body 9351. The lid 9352 is formed with a suction port 931 that penetrates the front and back surfaces and is larger than the outer shape of the stator 934 (circuit board 9344) when viewed from the direction along the rotation axis Ax.

  With the above configuration, the second circulation fan 93 is fixed around the rotation axis Ax by the interaction between the yoke 9343 magnetized by energizing the coil 9342 and the cylindrical magnet 9331B under the control of the circuit board 9344. The rotor 933 rotates in a predetermined direction with respect to the child 934. As the rotor 933 rotates, air is taken into the fan housing 935 via the suction port 931 by the plurality of blades, and the fan housing 935 passes through the discharge port 932 in the rotation tangential direction of the rotor 933. It is discharged outside.

[Internal structure of fan compartment]
Next, the internal structure of each of the fan storage portions 86 and 95 will be described.
12 and 13 are diagrams for explaining the internal structure of each of the fan storage portions 86 and 95. FIG. Specifically, FIG. 12 is a perspective view of the fan storage portions 86 and 95 as viewed from the upper rear side. 13 is a cross-sectional view taken along line II-II in FIG.
As shown in FIG. 13, the second fan storage portion 95 is provided with a partition wall portion 951 that protrudes inward and abuts against the outer surface of the fan housing 935 constituting the second circulation fan 93.

Specifically, the partition wall 951 has a circular frame shape protruding downward from the edge of the opening 1311 in the second base portion 13.
When the projector 1 is assembled, the front end portion of the partition wall portion 951 abuts on the peripheral edge portion of the suction port 931 in the fan housing 935, and the space outside the fan housing 935 is separated from the rotor 933 side ( 12 is divided into a first space Sp1 on the upper side and a second space Sp2 on the stator 934 side (lower side in FIG. 12).

  Although the specific illustration of the internal structure of the first fan storage portion 86 is omitted, the edges of the openings 1411 and 1412 in the first base portion 14 are the same as the second fan storage portion 95. Partition walls projecting downward from the sirocco fans 841 and 842 and contacting the peripheral edges of the suction ports 8411 and 8421 of the sirocco fans 841 and 842, respectively.

The first embodiment described above has the following effects.
In the present embodiment, the optical device 35 and the polarization conversion element 323 are housed in the spaces Ar1 and Ar2 inside the optical component casing 36 constituting each sealed structure. Therefore, it is possible to prevent oil smoke and the like from adhering, and to ensure the image quality of the projected image projected from the projector 1 stably for a long period of time.

The second upstream duct member 92 constituting the second hermetic structure includes a second fan storage portion 95, and a space outside the fan housing 935 is provided in the second fan storage portion 95 to the rotor 933. A partition wall 951 is provided that partitions the first space Sp1 on the side and the second space Sp2 on the stator 934 side. Thus, even if heat is transmitted to the bottom portion of the fan housing 935 on the side of the stator 934 due to heat generation of a circuit element such as a driver circuit mounted on the circuit board 9344, the heat of the bottom portion is reduced to the second level. It is possible to suppress transmission to the first space Sp1 on the rotor 933 side, that is, the suction port 931 side. That is, the heat of the bottom portion of the fan housing 935 can be suppressed from being transmitted to the air circulating through the second air flow passage via the suction port 931 and the discharge port 932, and the second circulation fan 93 can The temperature rise of the air inside the sealed structure 2 can be suppressed. For this reason, the polarization conversion element 323 can be efficiently cooled.
In addition, since the same partition part is provided also in the 1st fan accommodating part 86 of the 1st upstream duct member 83 which comprises a 1st sealing structure, the 1st sealing by the 1st circulation fan 84 is carried out. The temperature rise of the air inside the structure can be suppressed, and the optical device 35 can be efficiently cooled.

As described above, since the temperature increase of the air inside the first sealed structure by the first circulation fan 84 and the temperature increase of the air inside the second sealed structure due to the second circulation fan 93 can be suppressed, There is no need to increase the size of the heat exchanger 85 or the heat dissipation device 94 for cooling the air inside the structure, and the projector 1 can be reduced in size and weight.
Further, even if the rotational speeds of the first circulation fan 84 and the second circulation fan 93 are increased, the temperature rise of the air inside each sealed structure by the circulation fans 84 and 93 can be suppressed. The conversion element 323 can be effectively cooled.

  The partition wall 951 is provided outside the outer shape of the stator 934 (circuit board 9344) when viewed from the suction port 931 side. This ensures that the space where the opposing area ArF (FIG. 13) to which heat is transferred most due to the heat generated by the circuit elements mounted on the circuit board 9344 contacts the second space Sp2 at the bottom of the fan housing 935. It can be. For this reason, the heat transmitted to the fan housing 935 due to the heat generated by the circuit elements can be reliably retained in the second space Sp2, and can be further suppressed from being transmitted to the first space Sp1.

  Further, the first base portion 14 constituting the first fan accommodating portion 86 and the second base portion 13 constituting the second fan accommodating portion 95 are integrally formed as the base member 12. Similarly, the cover member 11 is also commonly used for the fan storage portions 86 and 95. As a result, a seal member or the like for ensuring the hermeticity of the respective fan storage portions 86 and 95 can be shared. For this reason, for example, compared with a configuration in which a sealing member is used for each fan housing portion without integrally forming each fan housing portion, the sealing performance of each sealing structure can be ensured more reliably. The assembly efficiency when assembling can also be improved.

[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. 14 is a view for explaining the internal structure of the second fan housing portion 95 in the second embodiment. 14 is a cross-sectional view taken along the line II-II in FIG. 12, similarly to FIG.
This embodiment is different from the first embodiment only in the formation position of the partition wall portion 951. Other configurations are the same as those in the first embodiment.

Specifically, in the present embodiment, the partition wall 951 has a circular frame shape protruding upward from the inner surface of the cover member 11 as shown in FIG.
Further, the partition wall 951 has a frame shape larger than the outer shape of the stator 934 (circuit board 9344) when viewed from the suction port 931 side (direction along the rotation axis Ax) in a state where the projector 1 is assembled. .
When the projector 1 is assembled, the front end portion of the partition wall portion 951 comes into contact with the bottom surface of the housing body 9351 in the fan housing 935, and the space outside the fan housing 935 is separated from the rotor 933 side ( 14 is divided into a first space Sp1 on the upper side and a second space Sp2 on the stator 934 side (lower side in FIG. 14).

  Although the specific illustration of the internal structure of the first fan storage portion 86 is omitted, like the second fan storage portion 95, it projects upward from the inner surface of the cover member 11, and each sirocco fan 841, A partition wall portion that contacts the bottom surface of 842 is provided.

The second embodiment described above has the following effects in addition to the effects described in the first embodiment.
In the present embodiment, the partition wall portion 951 is formed on the inner surface of the cover member 11, and the tip portion abuts on the housing body 9351 in the fan housing 935. As a result, the partition wall 951 abuts on the housing body 9351 having a relatively high strength with respect to the lid 9352, so that the fan housing 935 is deformed by the partition wall 951 when the projector 1 is assembled. Therefore, the second circulation fan 93 can be prevented from malfunctioning.
In addition, since the same partition part is provided also in the 1st fan accommodating part 86, the malfunction of the 1st circulation fan 84 can also be prevented similarly to the above.
The partition wall 951 is formed closer to the stator 934 than the connection portion between the housing body 9351 and the lid body 9352. As a result, the inside of the fan housing 935 and the second space Sp2 do not communicate with each other via the connecting portion, and the heat transmitted to the second space Sp2 is inside the fan housing 935, that is, the suction port. It is possible to prevent the air from being circulated through the second air flow passage via the 931 and the discharge port 932.

[Third embodiment]
Next, 3rd 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 and the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 15 is a view for explaining the internal structure of the second fan housing portion 95 in the third embodiment. 15 is a cross-sectional view taken along the line II-II in FIG. 12, similarly to FIGS.
This embodiment is different from the first embodiment and the second embodiment only in that a plurality of partition walls 951 are provided. Other configurations are the same as those in the first embodiment and the second embodiment.

Specifically, in this embodiment, as shown in FIG. 15, the partition wall portion 951 includes a rotor-side partition wall portion 951A similar to the partition wall portion 951 described in the first embodiment, and the second embodiment. The partition wall portion 951 and the stator-side partition wall portion 951B are the same.
Then, by assembling the projector 1, the space outside the fan housing 935 is similar to the first space Sp <b> 1 similar to the first embodiment and the second embodiment due to the two partition walls 951 </ b> A and 951 </ b> B. Are divided into a second space Sp2 and a third space Sp3 interposed between the first space Sp1 and the second space Sp2.

  Although the specific illustration of the internal structure of the first fan storage portion 86 is omitted, like the second fan storage portion 95, the rotor-side partition wall portion that abuts on each of the sirocco fans 841 and 842, respectively. And a stator side partition.

The third embodiment described above has the following effects in addition to the effects described in the first embodiment and the second embodiment.
In the present embodiment, the partition wall portion 951 is composed of a rotor-side partition wall portion 951A and a stator-side partition wall portion 951B, and the space outside the fan housing 935 is the first space Sp1 and the second space. It is partitioned into Sp2 and a third space Sp3. That is, it is possible to effectively transfer heat from the second space Sp2 to the first space Sp1 by providing the third space Sp3 between the first space Sp1 and the second space Sp2. Can be suppressed. In particular, since the air layer has a high heat insulation effect, heat transfer from the second space Sp2 to the first space Sp1 can be effectively suppressed by the air layer of the third space Sp3.

[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.
FIG. 16 is a diagram for explaining the internal structure of the second fan housing portion 95 in the fourth embodiment. 16 is a cross-sectional view taken along the line II-II in FIG. 12, similarly to FIGS.
This embodiment is different from the first embodiment only in that a plurality of partition walls 951 are provided as in the third embodiment. Other configurations are the same as those in the first embodiment.

Specifically, in the present embodiment, as shown in FIG. 16, the partition wall portion 951 includes a rotor-side partition wall portion 951A formed on the rotor 933 side (upper side in FIG. 16) and a stator 934 side ( In FIG. 16, the stator side partition 951B formed on the lower side is composed of two parts.
The rotor side partition wall portion 951A protrudes horizontally from the side wall portion of the housing recess 131 in the second base portion 13, and is formed so as to surround the side surface portion of the second circulation fan 93 excluding the discharge port 932 of the fan housing 935. Has been. The stator side partition 951B is also formed in the same manner as the rotor side partition 951A.
Then, by assembling the projector 1, the respective tip portions of the two partition wall portions 951A and 951B are brought into contact with the side surfaces of the fan housing 935 excluding the discharge port 932, and the partition wall portions 951A and 951B A space outside the fan housing 935 is interposed between the first space Sp1 on the rotor 933 side, the second space Sp2 on the stator 934 side, and the first space Sp1 and the second space Sp2. It is partitioned into a space Sp3.

  Although the specific illustration of the internal structure of the first fan storage portion 86 is omitted, like the second fan storage portion 95, the rotor-side partition wall portion that abuts on each of the sirocco fans 841 and 842, respectively. And a stator side partition.

The fourth embodiment described above has the following effects in addition to the effects described in the first to third embodiments.
In the present embodiment, the partition wall portion 951 includes two rotor side partition wall portions 951 </ b> A and stator side partition wall portions 951 </ b> B, and each tip portion abuts against the side surface of the housing body 9351 in the fan housing 935. . In other words, the partition walls 951A and 951B are formed closer to the stator 934 than the connection portion between the housing main body 9351 and the lid 9352. Accordingly, the inside of the fan housing 935 and the third space Sp3 do not communicate with each other via the connection portion, and the heat transmitted to the third space Sp3 is inside the fan housing 935, that is, the suction port. It is possible to prevent the air from being circulated through the second air flow passage via the 931 and the discharge port 932.

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, the formation position of the partition wall portion 951 is not limited to the formation position described in each of the above embodiments, and the space outside the fan housing 935 is divided between the first space on the rotor 933 side and the stator 934 side. Any formation position may be used as long as it can be partitioned into the second space.
In the third embodiment and the fourth embodiment, the partition wall portion 951 is composed of the rotor side partition wall portion 951A and the stator side partition wall portion 951B, but the number is limited to two. Alternatively, three or more may be provided. That is, the third space Sp3 is not limited to one and may be two or more.

In each said embodiment, although the fan accommodating parts 86 and 95 were provided in each upstream duct member 83 and 92, you may provide not only in this but in each downstream duct member 81 and 91, for example.
In each of the above embodiments, the optical device 35 and the polarization conversion element 323 are used as the objects to be cooled. However, the present invention is not limited to this, and other optical components may be employed.
In each of the embodiments described above, the light source device 31 is configured as a discharge light emission type light source device. However, the present invention is not limited to this. Various solid-state light emitting elements such as these may be adopted.

In each of the above embodiments, the projector 1 is configured as a three-plate projector including three liquid crystal panels 351. However, the projector 1 is not limited thereto, and may be configured as a single-plate projector including one liquid crystal panel. . Moreover, you may comprise as a projector provided with two liquid crystal panels, or a projector provided with four or more liquid crystal panels.
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 device, but a light modulation device other than liquid crystal, such as a device using a micromirror, may be used.
In each of the above embodiments, only an 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.

  INDUSTRIAL APPLICABILITY The present invention can be used for projectors used in presentations and home theaters because the image quality of projected images can be stably secured and the optical components can be efficiently cooled.

FIG. 2 is a perspective view illustrating an appearance of the projector according to the first embodiment. FIG. 2 is a diagram showing an internal configuration of a projector in the embodiment. FIG. 2 is a diagram showing an internal configuration of a projector in the embodiment. The figure which shows the structure of the optical unit in the said embodiment. The figure which shows the structure of the optical unit in the said embodiment. The figure which shows the structure of the optical unit in the said embodiment. The perspective view which shows the structure of the housing | casing internal cooling device in the said embodiment. The perspective view which shows the structure of the sealed circulation air cooling unit in the said embodiment. The perspective view which shows the structure of the sealed circulation air cooling unit in the said embodiment. The perspective view which shows the structure of the sealed circulation air cooling unit in the said embodiment. The figure for demonstrating the structure of the 2nd circulation fan in the said embodiment. The figure for demonstrating the internal structure of each fan accommodating part in the said embodiment. The figure for demonstrating the internal structure of each fan accommodating part in the said embodiment. The figure for demonstrating the internal structure of the 2nd fan accommodating part in 2nd Embodiment. The figure for demonstrating the internal structure of the 2nd fan accommodating part in 3rd Embodiment. The figure for demonstrating the internal structure of the 2nd fan accommodating part in 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 35 ... Optical apparatus (optical component), 36 ... Housing for optical components, 81, 91 ... Downstream duct member, 82 ... Connection duct member, 83, 92 ..Upstream duct member, 84, 93 ... circulation fan (sirocco fan), 86,95 ... fan housing part, 323 ... polarization conversion element, 931 ... suction port, 932 ... discharge Outlet, 933... Rotator, 934... Stator, 935... Fan housing, 951 .. Partition wall, 3612R, 3612G, 3612B .. Opening (inlet), 3621. Notch (outlet), Ax... Rotation axis, Sp1... First space, Sp2... Second space, Sp3.

Claims (4)

A projector comprising: an optical component disposed inside a sealed structure having an annular airflow passage that allows air to flow; and a sirocco fan that circulates air in the annular airflow passage,
The sealing structure is
The optical component housing having the optical component housed therein and an inflow port for allowing air to flow in and an outflow port for allowing air to flow out to the outside;
Air is introduced into the optical component casing through the inlet, and the air that has flowed out of the optical component casing through the outlet is returned to the optical component through the inlet again. A duct member for guiding the inside of the housing,
The sirocco fan includes a rotor having a plurality of blades, a stator that rotatably supports the rotor about a predetermined rotation axis, the stator and the rotor housed therein, and the rotation A fan housing having a suction port for the child to take in the air and a discharge port for discharging the air to the outside;
The stator and the rotor are stacked and arranged along the rotation axis,
The duct member includes a fan housing portion that houses the sirocco fan therein,
In the fan storage section,
A partition wall is provided that protrudes inward and abuts against the outer surface of the fan housing, and divides a space outside the fan housing into a first space on the rotor side and a second space on the stator side. A projector characterized by The projector according to claim 1, wherein
The partition wall is
The projector is provided outside the outer shape of the stator when viewed from the suction port side. In the projector according to claim 1 or 2,
The partition wall is
A plurality of spaces outside the fan housing are partitioned into the first space, the second space, and a third space interposed between the first space and the second space. A projector characterized by that. The projector according to any one of claims 1 to 3,
A plurality of the sealing structures are provided so as to have independent air flow passages,
Each of the fan housing portions constituting the plurality of hermetic structures is integrally formed.

Images