JP2015001686A - projector - Google Patents

Abstract

A projector capable of managing humidity during storage is provided. A projector includes an exterior housing that houses optical elements including a light source device and a light modulation device and a housing that is housed inside the exterior housing and the projector is in a non-operating state. A silica gel 5 (moisture absorbing portion) that absorbs moisture inside the body 10 and a light source device 30 (heating portion) that is housed in the exterior housing 10 and heats the silica gel 5 when the projector is in an operating state. . [Selection] Figure 3

Description

  The present invention relates to a projector.

  2. Description of the Related Art Conventionally, there is known a projector that modulates a light beam emitted from a light source device with a light modulation device according to image information and projects the modulated light beam with a projection lens. In such a projector, an optical element including a light source device, a light modulation device, and the like is housed in a housing. In addition, such optical elements tend to deteriorate in optical performance due to the influence of temperature and humidity.

  In Patent Document 1, a first housing that houses a laser light source and a light modulation unit that modulates laser light to generate image light, a compressor, a radiator, an expansion valve, and a heat absorber are connected via a refrigerant pipe. A second housing that houses the refrigerant circuit to be connected, and air in the first housing is sent to the second housing to exchange heat with the heat absorber, and the air exchanged with the heat absorber is exchanged with the first housing. And a projection type image display device provided with a blowing means for sending to the projector. With this configuration, the laser light source is prevented from condensing even when the laser light source is cooled, thereby preventing the performance degradation of the laser light source.

JP 2009-122385 A

However, in the projection display apparatus described above, in a state where the projection display apparatus is operating (operating state), the laser light source is prevented from dew condensation by the operation of the blower unit or the like. In the state where is not operating (non-operating state), there is no mention of whether to prevent condensation of the laser light source or other optical elements. When the projector is not used in a non-operating state, for example, when the projector is stored, the saturated water vapor amount decreases and the humidity increases due to a decrease in the temperature inside the housing. And when humidity rises, there exists a possibility that dew condensation may occur in an optical element. Thereby, it becomes a subject to manage the humidity at the time of storage of a projector.
Therefore, a projector capable of managing the humidity during storage has been desired.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example is a projector including a light source device and a light modulation device that modulates a light beam emitted from the light source device according to image information, and (a) a light source device and light A housing in which an optical element including a modulation device is housed; (b) a moisture absorption part that is housed in the housing and absorbs moisture inside the housing when the projector is in a non-operating state; And a heating unit that heats the moisture absorption unit when the projector is in an operating state.

  According to such a projector, the housing, the moisture absorption unit, and the heating unit are provided. When the projector is in a non-operating state, moisture inside the housing is absorbed by the moisture absorption unit. Further, when the projector is in an operating state, the moisture absorption unit is heated by the heating unit. With this configuration, when the projector is in a non-operating state (when not in use, for example, during storage), the moisture absorption section absorbs moisture inside the housing, thereby reducing the humidity inside the housing. Further, when the projector is in an operating state (during use), the hygroscopic part can be dried by discharging the moisture absorbed by the hygroscopic part by heating the hygroscopic part by the heating part. This makes it possible to manage the humidity inside the housing during storage, and prevent the optical performance of the optical element from deteriorating by preventing condensation of the optical element including the light source device and the light modulation device. it can. Further, by drying the moisture absorbing part with the heating part, the moisture absorbing part can be used repeatedly, and the prevention of deterioration of the optical performance of the optical element can be maintained.

  Application Example 2 In the projector according to the application example described above, (a) an air inlet for introducing air that cools the optical element housed in the housing, and (b) heat of the optical element flowing in the housing. And (c) when the projector is in an operating state, the air inlet and the air outlet are opened, and when the projector is in a non-operating state, the air inlet and the air outlet are closed. And an opening / closing part.

  According to such a projector, the projector includes an intake port, an exhaust port, and an opening / closing unit that opens and closes the intake port and the exhaust port. The opening / closing unit opens the intake port and the exhaust port when the projector is in an operating state. The opening / closing unit closes the intake port and the exhaust port when the projector is in a non-operating state. Accordingly, when the projector is in a non-operating state (during storage), the inside of the housing can be hermetically sealed, so moisture in the housing can be absorbed and inflow of moisture into the housing can be suppressed. it can. Thereby, the moisture absorption efficiency inside a housing | casing at the time of storage can be improved.

  Application Example 3 In the projector according to the application example, it is preferable that the projector includes a transmission unit that transmits heat of the heating unit to the moisture absorption unit.

  According to such a projector, it is possible to efficiently discharge the moisture absorbed by the hygroscopic part by providing the transmission part and transmitting the heat of the heating part to the hygroscopic part.

  Application Example 4 In the projector according to the application example described above, the heating unit is preferably a light source device.

  According to such a projector, since the heating unit is the light source device, the heat generated by the light source device can be effectively used. Further, it is not necessary to install another heating unit, and the projector can be miniaturized.

  Application Example 5 In the projector according to the application example described above, it is preferable that the hygroscopic portion is formed including silicon dioxide.

  According to such a projector, the moisture absorption part is formed including silicon dioxide, so that the moisture can be efficiently absorbed, and the moisture can be discharged by being heated by the heating part.

  Application Example 6 In the projector according to the application example described above, it is preferable that the hygroscopic portion is formed of a polymer having water absorption.

  According to such a projector, the moisture absorbing portion is formed of a water-absorbing polymer, so that the moisture can be efficiently absorbed, and the moisture can be discharged by being heated by the heating portion.

FIG. 3 is a diagram illustrating an optical system of the projector according to the embodiment. FIG. 2 is a schematic diagram illustrating a configuration of a projector. FIG. 2 is a schematic diagram illustrating a configuration of a projector.

Hereinafter, embodiments will be described with reference to the drawings.
Embodiment

  FIG. 1 is a diagram illustrating an optical system of a projector 1 according to the embodiment. The configuration and operation of the optical system of the projector 1 will be described with reference to FIG.

  The projector 1 of the present embodiment is a device that modulates the light beam emitted from the light source device 30 according to image information and enlarges and projects it on a projection surface such as a screen (not shown). The projector 1 of the present embodiment is covered with an exterior housing 10 that is a substantially rectangular parallelepiped.

  In addition to the optical unit 3 (FIG. 1), the projector 1 includes a control unit (not shown), a power supply unit (not shown) that supplies power to the light source device 30 and the control unit, and the projector 1. A cooling mechanism 2 (FIG. 2) for cooling the inside is provided. The control unit includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like, functions as a computer, and performs overall control of the operation of the projector 1. Further, an input unit (not shown) for instructing the operation of the projector 1 is provided on the outer surface of the exterior housing 10.

  As shown in FIG. 1, the optical unit 3 houses the light source device 30, the illumination optical device 31, the color separation optical device 32, the relay optical device 33, the electro-optical device 34, and these optical devices 30 to 34. The optical component housing 36 is configured to support and fix the projection lens 35 at a predetermined position.

  The light source device 30 includes a discharge-type arc tube 301 and a reflector 302 and is accommodated in a light source casing 300. The arc tube 301 is fixed to the reflector 302 with an optical position secured. The light source device 30 reflects the light beam emitted from the arc tube 301 by the reflector 302 and then emits it toward the collimating lens 310. The light source device 30 of this embodiment employs an ultrahigh pressure mercury lamp. Further, the light source device 30 is installed so as to be replaceable with respect to the optical component housing 36.

  The illumination optical device 31 includes a collimating lens 310, a first lens array 311, a second lens array 312, a polarization conversion element 313, a superimposing lens 314, and a condenser lens 315. In this embodiment, the collimating lens 310 is installed in the light source casing 300 of the light source device 30, aligns the emission direction of the light beam emitted from the light source device 30, and is parallel to the illumination optical axis OA. And emitted to the illumination optical device 31 (first lens array 311). The illumination optical axis OA as the optical axis is the central axis of the light beam emitted from the light source device 30 toward the illuminated area. The first lens array 311 splits the light beam emitted from the light source device 30 into partial light beams, and emits them in the direction along the illumination optical axis OA. The second lens array 312 emits the partial light beams emitted from the first lens array 311 toward the superimposing lens 314, respectively.

  The polarization conversion element 313 has a function of substantially aligning each partial light beam, which is random polarized light emitted from the second lens array 312, with one type of polarized light that can be used in the liquid crystal panel 342. Each partial light beam emitted from the second lens array 312 and converted into substantially one type of polarized light by the polarization conversion element 313 is substantially superimposed on the surface of the liquid crystal panel 342 by the superimposing lens 314. Note that the light beam emitted from the superimposing lens 314 is collimated by the condenser lens 315 and superimposed on the liquid crystal panel 342. In detail, the condenser lens 315 is provided for each of three color lights described later.

  The color separation optical device 32 includes a first dichroic mirror 321, a second dichroic mirror 322, and a reflection mirror 323. The color separation optical device 32 separates the light beam emitted from the illumination optical device 31 into three color lights of red (R) light, green (G) light, and blue (B) light.

  The relay optical device 33 includes an incident side lens 331, a relay lens 333, and reflection mirrors 332 and 334. The relay optical device 33 guides the R light separated by the color separation optical device 32 to the liquid crystal panel 342R for R light. In the present embodiment, the relay optical device 33 is configured to guide the R light. However, the present invention is not limited to this. For example, the relay optical device 33 may be configured to guide the B light.

  The electro-optical device 34 includes three incident-side polarizing plates 341 and three liquid crystal panels 342 as transmission-type light modulation devices (342R for a liquid crystal panel for R light, 342G for a liquid crystal panel for G light, and 342G for B light) 342B), three exit-side polarizing plates 343, and one cross dichroic prism 345.

  The liquid crystal panel 342 (342R, 342G, 342B) modulates the light beam separated for each color light by the color separation optical device 32 according to image information. The cross dichroic prism 345 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. The cross dichroic prism 345 synthesizes the color lights modulated by the liquid crystal panels 342R, 342G, and 342B and emits them to the projection lens 35.

  The projection lens 35 is composed of a combined lens in which a plurality of lenses are combined, and enlarges and projects the light beam modulated and synthesized by the electro-optical device 34 onto a projection surface such as a screen.

  In addition, the optical element which comprises an optical system is comprised with the organic member and the inorganic member. In the present embodiment, the optical elements constituted by organic members are the incident side polarizing plate 341, the emission side polarizing plate 343, and the like. Further, the polarization conversion element 313 and the liquid crystal panel 342 are configured using both an inorganic member and an organic member. Others are composed of inorganic members.

  2 and 3 are schematic diagrams illustrating the configuration of the projector 1. FIG. 2 shows the projector 1 in use (in operation), and FIG. 3 shows the projector 1 in non-use (in operation). In FIG. 2, in order to facilitate understanding of the air flow, a part of the electro-optical device 34 is omitted. With reference to FIGS. 2 and 3, the configuration and operation of the exterior housing 10 will be described.

  As shown in FIG. 2, in this embodiment, granular silica gel 5 (so-called silicon dioxide) is mixed with cement 6 and fixed to the back surface of the light source device 30 (reflector 302).

  Here, the silica gel 5 constitutes a hygroscopic portion that absorbs moisture inside the exterior housing 10. Further, the cement 6 constitutes a transmission unit that transmits the heat of the heating unit to the moisture absorption unit. In this embodiment, the cement 6 is an alumina cement. In the present embodiment, the light source device 30 is used as a heating unit that heats the hygroscopic unit. The operation of the moisture absorption unit, the heating unit, and the transmission unit will be described later.

  In the present embodiment, the exterior housing 10 is provided with a first intake port 11, a second intake port 12, and an exhaust port 15. Corresponding to the first intake port 11 and the second intake port 12, a first intake fan 21 and a second intake fan 22 constituting the cooling mechanism 2 are provided in the exterior housing 10. . Corresponding to the exhaust port 15, an exhaust fan 25 constituting the cooling mechanism 2 is provided in the exterior housing 10.

  The first intake port 11, the second intake port 12, and the exhaust port 15 are provided with an opening / closing part 7 that opens and closes the respective ports. In the present embodiment, the opening / closing part 7 is composed of a movable louver. Specifically, a first intake louver 71 that opens and closes the first intake port 11 relative to the first intake port 11 is provided. A second air inlet louver 72 that opens and closes the second air inlet 12 relative to the second air inlet 12 is provided. An exhaust port louver 75 that opens and closes the exhaust port 15 relative to the exhaust port 15 is provided.

  The opening / closing part 7 includes an opening / closing mechanism part (not shown) for opening and closing each louver. Specifically, the opening / closing mechanism includes a motor (not shown) and a link mechanism (not shown) that opens and closes each louver in conjunction with the operation of the motor.

  When the projector 1 is in an operating state, the opening / closing unit 7 is driven by the opening / closing mechanism unit to open each louver. Here, the “projector 1 is in an operating state” means, in detail, that a power key (a key for turning on the power) of the input unit is pressed, the signal is received by the control unit, and an instruction from the control unit is received. Based on this, the power supply unit includes the states after the power supply unit starts supplying power (operating power) necessary for image projection to each component. Hereinafter, this state is referred to as “use state” or “during use” in addition to “operation state”. Further, in detail, the opening / closing mechanism unit drives the motor based on an instruction from the control unit when the power key (key for turning on the power) is pressed, and causes the motor to be driven. The link mechanism is driven to drive (open) each louver.

  In addition, when the projector 1 is not operating, the opening / closing unit 7 is driven by the opening / closing mechanism unit to close each louver. Here, the “projector 1 is in a non-operating state” specifically means that a power key (a key for turning off the power) of the input unit is pressed, the control unit receives the signal, and an instruction from the control unit The power supply unit stops supplying power to each component and includes a state of waiting for an operation to turn on the power (standby state), and then the power cable (not shown) is removed, The state where the power supply is completely stopped. Hereinafter, this state is referred to as “non-use state” or “non-use state” in addition to the “non-operation state”. Further, in detail, the opening / closing mechanism unit drives the motor based on an instruction from the control unit when the power key (key for turning off the power source) is pressed, and causes the motor to be driven. The link mechanism is driven to drive (close) each louver.

  When the projector 1 is in an operating state by the operation of the opening / closing section 7, the first intake louver 71, the second intake louver 72, and the exhaust louver 75 correspond to the corresponding first intake 11 and second The intake port 12 and the exhaust port 15 are opened. When the projector 1 is in a non-operating state, the first intake louver 71, the second intake louver 72, and the exhaust louver 75 correspond to the corresponding first intake 11 and second intake 12 and exhaust. The mouth 15 is closed.

  When the cooling mechanism 2 is in an operating state, the first intake fan 21 is driven to take in outside air (air) through the opened first intake port 11. Then, the air sucked from the first air inlet 11 flows to the light source device 30 and the polarization conversion element 313 via a duct (not shown). The air that has flowed to the light source device 30 and the polarization conversion element 313 takes heat of the light source device 30 and the polarization conversion element 313, flows through a duct (not shown), and is exhausted from the exhaust port 15 to the outside of the outer casing 10 by the exhaust fan 25. Exhausted.

  In the operating state, the cooling mechanism 2 draws in outside air (air) through the opened second intake port 12 by driving the second intake fan 22. Then, the air sucked from the second air inlet 12 flows to the three liquid crystal panels 342 through a duct (not shown). The air flowing to the liquid crystal panel 342 takes heat of the liquid crystal panel 342, flows through a duct (not shown), and is exhausted from the exhaust port 15 to the outside of the exterior housing 10 by the exhaust fan 25.

  As described above, the projector 1 controls the optical elements (the light source device 30, the polarization conversion element 313, and the liquid crystal panel 342) constituting the optical unit 3 by the cooling mechanism 2 so that the temperature becomes an appropriate temperature. The cooling mechanism 2 cools other optical elements with the air sucked from the first air intake port 11 and the second air intake port 12, and includes a power supply unit, a circuit block for mounting the control unit, and the like. The inside of the body 10 is cooled.

  When the projector 1 is in an operating state, the silica gel 5 installed in the light source device 30 and mixed in the cement 6 is transferred from the light source device 30 (reflector 302) through the cement 6 (transmission unit). . And in this embodiment, the silica gel 5 becomes 150 degreeC or more with the heat transferred, and the water | moisture content absorbed (contained) is discharged | emitted. Specifically, moisture contained in the silica gel 5 is vaporized and discharged (exhaust) from the exhaust port 15 by the operation of the cooling mechanism 2. By this operation, the silica gel 5 is dehumidified and dried.

  In addition, the silica gel 5 is materially stable, does not have much shape change (swelling or the like) due to moisture absorption, and has high safety. Further, the silica gel 5 can be reused by discharging moisture contained by heating, and can be used repeatedly.

  Here, when the projector 1 is in a non-operating state, the first intake louver 71, the second intake louver 72, and the exhaust louver 75 correspond to the corresponding first intake 11 by driving the opening / closing mechanism. By closing the second intake port 12 and the exhaust port 15, the interior of the exterior housing 10 is sealed.

  When the projector 1 is in a non-operating state, particularly when the power cable is removed, the temperature inside the exterior housing 10 gradually decreases and becomes the same as the temperature of the outside air. When the projector 1 is stored, the temperature inside the exterior housing 10 changes in conjunction with the outside air.

  Here, “store” means that, in the present embodiment, the projector 1 is in a non-operating state and the projector 1 is maintained / stored in a standby state where the power cable is connected. This means that the removed projector 1 is maintained and stored. Hereinafter, this state is referred to as “storage state” or “at the time of storage”.

  When the projector 1 is stored, the temperature inside the outer casing 10 decreases, so that the amount of saturated water vapor inside the outer casing 10 decreases and the humidity increases. However, since the dried silica gel 5 is installed inside the outer casing 10, moisture (moisture) inside the outer casing 10 is absorbed by the silica gel 5. The silica gel 5 functions to suppress an increase in humidity. The interior of the exterior housing 10 includes the interior of the optical component housing 36 (inside the optical unit 3) in which the optical elements are accommodated.

  Moreover, since the inside of the exterior housing 10 is in a sealed state, moisture outside the exterior housing 10 is prevented from directly flowing into the exterior housing 10. Thereby, the rise in humidity inside the exterior housing 10 is reduced.

  Such an operation of the silica gel 5 prevents the optical performance from deteriorating by reducing an increase in humidity for the optical element formed of an organic member during storage. In addition, for optical elements composed of inorganic members, generation of mold or the like is prevented to prevent deterioration of optical performance.

  Note that when the projector 1 is put into the use state again from the storage state, the silica gel 5 is dried by discharging moisture absorbed during storage by the heat of the light source device 30 as described above. .

According to the embodiment described above, the following effects can be obtained.
When the projector 1 according to this embodiment is in a non-operating state (when not in use), the silica gel 5 (moisture absorbing portion) absorbs moisture inside the outer casing 10 to reduce the humidity inside the outer casing 10. Can be made. In the operating state (during use), the light source device 30 (heating unit) heats the silica gel 5 to discharge the moisture absorbed by the silica gel 5, thereby drying the silica gel 5. Thereby, it becomes possible to manage the humidity inside the exterior casing 10 during storage, and by preventing condensation of the optical elements including the light source device 30 and the light modulation device 342, the optical performance of the optical elements is deteriorated. Can be prevented. Moreover, by drying the silica gel 5 with the light source device 30, the silica gel 5 can be used repeatedly, and the prevention of deterioration of the optical performance of the optical element can be maintained.

  The projector 1 according to this embodiment includes a first intake port 11, a second intake port 12, an exhaust port 15, and an opening / closing unit 7 that opens and closes the first intake port 11, the second intake port 12, and the exhaust port 15. I have. The opening / closing unit 7 opens the first intake port 11, the second intake port 12, and the exhaust port 15 when the projector 1 is in an operating state. Thereby, the optical element can be appropriately cooled by the operation of the cooling mechanism 2. Further, the opening / closing unit 7 closes the first intake port 11, the second intake port 12, and the exhaust port 15 when the projector 1 is in a non-operating state. Thereby, when the projector 1 is in a non-operating state (during storage), the interior of the exterior casing 10 can be sealed, so that moisture outside the exterior casing 10 flows into the exterior casing 10. To prevent that. Thereby, the moisture absorption efficiency inside the exterior housing | casing 10 at the time of storage can be improved, and the raise of the humidity inside the exterior housing | casing 10 can be reduced.

  The projector 1 of this embodiment uses the light source device 30 as a heating unit. Thereby, the heat which generate | occur | produces in the light source device 30 can be utilized effectively. Further, it is not necessary to install another heating unit inside the exterior casing 10, and the projector 1 can be downsized.

  The projector 1 according to the present embodiment includes a cement 6 as a transmission unit that transmits heat of the light source device 30 to the silica gel 5. Thereby, the water | moisture content which the silica gel 5 absorbed can be discharged | emitted efficiently.

  In the projector 1 of the present embodiment, the moisture absorption part is configured to include silica gel (silicon dioxide). As a result, moisture inside the exterior casing 10 can be efficiently absorbed, and moisture can be discharged by being heated by the light source device 30.

  In the light source device 30 of the present embodiment, the silica gel 5 (moisture absorbing portion) and the cement 6 (transmitting portion) are fixed. Further, the light source device 30 is installed so as to be replaceable with respect to the optical component housing 36. As a result, the silica gel 5 can be reused by drying as described above. However, the silica gel 5 can be replaced with a new silica gel 5 by replacing the light source device 30, so that the moisture absorption performance of the silica gel 5 is further improved. Can be kept in good condition.

  With these effects, the projector 1 can improve the optical quality, and in particular, can prevent display abnormality caused by the optical element in the long term. Since the optical element is deteriorated or accelerated by humidity in addition to light and temperature, suppressing the humidity realizes long-term reliability of the optical element. For example, a TAC (triacetyl cellulose) film which is an example of a member used for an organic optical element is yellowed by hydrolysis. Further, the inorganic optical element is not limited to the organic type, and deterioration of the inorganic type optical element may be accelerated by humidity. For example, an aluminum fine wire structure which is an example of an inorganic optical element and is used for a polarizing plate or the like, the deterioration of optical properties (polarization degree) due to oxidation and the growth of defect points (light loss) are promoted by humidity. . Display abnormalities include uneven color, reduced contrast, light loss, and the like. Color unevenness refers to a state in which the color density of a projected image is partially different and is not uniform.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the scope of the invention. A modification will be described below.

  The projector 1 according to the embodiment includes silica gel (silicon dioxide) as a moisture absorption unit. However, it is not limited to this, The moisture absorption part may be formed with the polymer which has water absorption. Examples of the water-absorbing polymer include urethane resin-based polymers and polyvinyl alcohol-based polymers. When using, it is necessary to appropriately set the temperature applied to the polymer according to the characteristics of the polymer, and to consider the location of the polymer and the characteristics of the transfer part that transfers heat to the polymer. . Thereby, even if it uses a polymer, the effect similar to the said embodiment is acquired.

  The projector 1 of the embodiment includes the opening / closing unit 7, but may be configured without the opening / closing unit 7. In this case, at the time of storage, the exterior housing 10 suppresses inflow of external moisture to some extent, and the silica gel 5 absorbs moisture inside the exterior housing 10, thereby preventing a dew condensation on the optical element. is there. Further, the projector 1 can be reduced in size by not including the opening / closing part 7.

  The projector 1 of the embodiment includes a cement 6 as a transmission unit. However, you may comprise the reflector 302 which comprises the light source device 30 as a transmission part. For example, the reflector 302 may be formed by mixing the silica gel 5 into a glass member that is a material of the reflector 302.

  The projector 1 of the embodiment includes a cement 6 as a transmission unit. However, the present invention is not limited to this, and the transmission unit only needs to be able to transmit heat from the heating unit to the moisture absorption unit, and a metal member, a synthetic resin member, or the like can be used as the transmission unit. Moreover, a heat pipe etc. can also be used as a heat-transfer part. In addition, by using a metal member, a synthetic resin member, a heat pipe, etc. as a transmission part, it is possible to install a moisture absorption part near the optical element (especially optical element comprised with an organic member) which wants to suppress moisture absorption. Become. Moreover, it becomes possible to install a moisture absorption part in the position where the moisture absorption effect can be expected more.

  In the projector 1 according to the embodiment, the silica gel 5 as the moisture absorbing portion is mixed in the cement 6 and fixed (fixed) to the reflector 302. However, as a method for fixing the silica gel 5, it may be mixed with a silicon-based resin or the like, and fixed by coating or heating. Moreover, after forming a carbon-type sheet | seat etc. in a bag shape and putting the silica gel 5 in this, the bag may be fixed with an inorganic type high heat-resistant adhesive agent.

  The projector 1 according to the embodiment uses the light source device 30 as a heating unit. However, you may install heating parts, such as a heater, separately. By installing the heating unit separately, the degree of freedom of the installation position of the heating unit is improved, and the moisture absorption unit can be installed near the optical element that is desired to absorb moisture.

  The projector 1 according to the embodiment includes a movable louver (first inlet louver 71, second inlet louver 72, exhaust louver 75) and an opening / closing mechanism that drives the louver as the opening / closing unit 7. I have. The open / close mechanism includes a motor and a link mechanism that opens and closes each louver in conjunction with the operation of the motor. However, the opening / closing section is not limited to this configuration, and may be any configuration that can open and close the intake ports (first intake port 11 and second intake port 12) and exhaust port 15. For example, a plate-like member that opens and closes the intake port and the exhaust port may be used as the opening and closing unit, and a motor, a pinion, and a rack may be used as the opening and closing mechanism unit. In this configuration, a rack is formed on the plate-like member, and the pinion rotates by driving the motor, and the rack (plate-like member) moves following the rotation of the pinion, thereby opening and closing the intake port and the exhaust port. .

  The projector 1 according to the embodiment includes a movable louver and an opening / closing mechanism that drives the louver as the opening / closing unit 7, and opens and closes the intake and exhaust ports according to instructions from the control unit. However, the opening / closing unit may manually open and close the intake port and the exhaust port. In the case of this configuration, the projector 1 can be reduced in size.

  In the present embodiment, an organic member is used for the incident side polarizing plate 341, the emission side polarizing plate 343, and the like, and both an inorganic member and an organic member are used for the polarization conversion element 313 and the liquid crystal panel 342. However, the present invention is not limited to this, and an inorganic member such as an aluminum thin wire structure can be used for the polarizing plate, and an organic member such as plastic can be used for the lens.

  The projector 1 according to the embodiment uses a transmissive light modulation device as the light modulation device. However, the present invention is not limited to this, and other types of light modulation devices such as a reflection type light modulation device and a micromirror type light modulation device can be employed. For example, a DMD (Digital Micromirror Device) can be adopted as the micromirror type light modulation device.

  The projector 1 of the embodiment uses a discharge light source as the light source device 30. However, a solid light source may be used as the light source device. As the solid light source, various solid light emitting elements such as a laser light source, an LED (Light Emitting Diode), an organic EL (Electro Luminescence) element, and a silicon light emitting element may be used.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 5 ... Silica gel (moisture absorption part), 6 ... Cement (transmission part), 7 ... Opening / closing part, 10 ... Exterior housing | casing, 11 ... 1st inlet port, 12 ... 2nd inlet port, 15 ... Exhaust port, DESCRIPTION OF SYMBOLS 21 ... 1st intake fan, 22 ... 2nd intake fan, 25 ... Exhaust fan, 30 ... Light source device (heating part), 71 ... 1st inlet louver, 72 ... 2nd inlet louver, 75 ... Exhaust Louver, 342... Liquid crystal panel (light modulation device).

Claims (6)

A projector comprising: a light source device; and a light modulation device that modulates a light beam emitted from the light source device according to image information,
A housing in which an optical element including the light source device and the light modulation device is stored;
When the projector is housed inside and the projector is in a non-operating state, a moisture absorbing part that absorbs moisture inside the housing;
A heating unit that is housed inside the housing and heats the moisture absorption unit when the projector is in an operating state;
A projector comprising: The projector according to claim 1,
An air inlet through which air for cooling the optical element housed in the housing flows;
An exhaust port for exhausting air that has flowed through the housing and deprived of heat of the optical element;
An opening / closing portion that opens the intake port and the exhaust port when the projector is in the operating state, and closes the intake port and the exhaust port when the projector is in the non-operating state;
A projector comprising: The projector according to claim 1 or 2, wherein
A projector comprising: a transmission unit that transmits heat of the heating unit to the moisture absorption unit. It is a projector as described in any one of Claims 1-3, Comprising:
The projector, wherein the heating unit is the light source device. It is a projector as described in any one of Claims 1-4, Comprising:
The said moisture absorption part is formed including silicon dioxide, The projector characterized by the above-mentioned. It is a projector as described in any one of Claims 1-4, Comprising:
The said moisture absorption part is formed with the polymer which has water absorption, The projector characterized by the above-mentioned.

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