JP2012008179A - Projector - Google Patents

Abstract

Provided are a projector that is not easily affected by an installation environment, can perform appropriate cooling while maintaining cooling efficiency, and a projector that can reduce noise.
A projector 1 is installed relative to a suction opening 54 and a first opening (intake opening 54) and a second opening (exhaust opening 56) installed in a front surface 1a. A first duct 611 having a first inlet 611A for sucking outside air into the exterior casing 5 and a second duct 621 having a second inlet 621A, and an exhaust opening 56, are installed in relation to the outer casing. An exhaust duct 641 having an exhaust port 641B for exhausting the inside air inside the body 5 to the outside, and a first intake fan 71, a second intake fan 72, and an exhaust fan 74 that perform intake and exhaust, and two intake ports The first intake port 611A that is one of the intake ports is provided with a filter 81 that cleans the outside air to be sucked.
[Selection] Figure 3

Description

  The present invention relates to a projector.

  2. Description of the Related Art Conventionally, a projector has a configuration in which a light beam emitted from a light source device is modulated by a light modulation device based on image information to form an optical image, and the optical image is enlarged and projected on a screen by a projection lens device. . In such a projector, since members constituting the projector generate heat including the light source device and the light modulation device, it is necessary to cool the generated members in order to maintain the function of the projector. For this purpose, the projector includes a cooling mechanism that has an opening for intake and exhaust in the exterior casing and includes a cooling fan, a duct, and the like inside the exterior casing. Then, the projector takes in the outside air from the intake opening by the operation of the cooling fan, causes the inside of the duct to flow, and blows the outside air to the heated member to cool it. In addition, air (inside air) inside the outer casing that has been cooled and warmed is exhausted from the exhaust opening to the outside of the outer casing by a cooling fan or the like.

  Here, with respect to the exterior casing of the projector (in the case of a substantially rectangular parallelepiped shape), the surface (surface facing the screen) from which the projection lens device extends is defined as the front surface, and the horizontal surface adjacent to the front surface is defined as the front surface. A side surface, a surface facing the front surface is a back surface, and a vertical surface adjacent to the front surface is an upper surface and a lower surface. In that case, in the projector, the opening for intake is installed on one of the side, back, or bottom of the exterior housing, and the opening for exhaust is installed on any of the front, side, or back of the exterior housing. It is common to be done.

  In Patent Document 1, although it is a rear projection type display (so-called rear projector), a separate room including a projection block unit is configured in a cabinet of the apparatus main body separated from a space including a projection lens surface corresponding to a transmissive screen. In addition, in order to cool the components constituting the projection block, an opening for intake or / and exhaust is provided on the front side of the apparatus main body on the side of the transmission screen, It is disclosed that a duct-shaped portion communicating between the two is provided in a cabinet to serve as a cooling air flow path. Thereby, the projection block is cooled through the flow path (duct), so that the projection block is reliably cooled without being related to the installation state of the apparatus main body.

  Further, when the projector is cooled, noise is generated due to the operation (for example, rotation) of the cooling fan, so that it is necessary to reduce the noise. Patent Document 2 discloses that the cooling fan is covered with a sound insulation member to prevent the rotation sound (noise) generated by the cooling fan from leaking to the outside, thereby reducing noise.

JP 2001-343708 A JP 2005-17458 A

However, in an installation environment in which a projector is installed, there may be a wall, a protrusion, or the like in the vicinity of the side surface or the back surface of the projector. When a projector is installed in such an environment, walls and protrusions become obstacles in projectors that have intake openings and exhaust openings on the side and back, reducing intake efficiency and exhaust efficiency. There was a problem that (cooling efficiency was lowered). Also, in projectors, the intake and exhaust ports of ducts that are installed opposite to the intake openings and exhaust openings are places where the cooling noise of the cooling fan and the vibration noise that accompanies rotation are likely to leak. Cause noise. In particular, when installing intake openings (intake ports) on a plurality of surfaces, reducing noise is an issue.
Accordingly, there has been a demand for a projector that is not easily affected by the installation environment, can maintain the cooling efficiency and can perform appropriate cooling, and can reduce noise.

  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 includes a light source device that emits a light beam, a light modulation device that modulates the light beam based on image information to form an optical image, and a projection lens device that projects the optical image. A projector having a light source device and a light modulation device, and an exterior housing for fixing the projection lens device so that the projection lens device can be extended from one surface. And a second opening, a plurality of air intake ducts that are installed relative to the first opening, and that sucks outside air into the exterior housing, and that flows the sucked outside air, and a second And an exhaust duct that is disposed to face the opening and exhausts the inside air inside the exterior housing to the outside, and that causes the inside air to flow through the exhaust port.

  Application Example 2 In the projector according to the application example described above, it is preferable to include a plurality of fans that are installed corresponding to a plurality of intake ducts and exhaust ducts and perform intake and exhaust.

  Application Example 3 In the projector according to the application example described above, it is preferable that one of the plurality of air intake ports is provided with a filter device that cleans the outside air to be taken in.

  In general, the probability that an obstacle such as a wall exists in the vicinity of one surface (surface facing the screen) on which the projection lens device can extend is such that a wall or the like is present in the vicinity of the surface other than one surface. It may be lower than the probability that an obstacle exists. Therefore, as in the projector described above, the intake port (intake duct) and the exhaust port are opposed to the first opening and the second opening that are installed on one surface of the exterior housing from which the projection lens device can extend. (Exhaust duct) is used in a situation where there is a low probability that an obstacle exists, and intake and exhaust can be performed reliably. Thereby, it is possible to realize a projector that is hardly affected by the installation environment and can maintain the cooling efficiency.

  In addition, by providing a filter device that cleans the outside air at one of the plurality of air inlets, the cleaned outside air that is sucked through the air intake duct can be affected by, for example, an optical component that affects an optical image. It can be cooled by spraying (for example, a light modulation device). As a result, for example, dust contained in the outside air can be prevented from adhering to the light modulation device (appropriate cooling can be performed), so that a shadow due to dust can be projected on the projected optical image. Therefore, the quality of the projected image can be maintained. In addition, outside air sucked from an air inlet that does not have a filter device passes through an air intake duct to a member (for example, a light source device, a circuit unit, or a power supply device) that requires cooling inside the outer casing that does not affect the optical image. It can be cooled by spraying.

  In addition, the intake and exhaust vents that cause the noise of the cooling fan to rotate and the vibration noise that accompanies rotation are installed on one surface (the surface facing the screen) where the projection lens device can extend. If the viewer is not positioned between the projection lens device and the screen, the noise is not directly transmitted to the viewer but is recognized. Since it can be made difficult, noise reduction can be achieved. Also, by providing a plurality of air intakes relative to the first opening provided on one surface, it is possible to reduce noise compared to providing air intakes on separate surfaces.

  Application Example 4 In the projector according to the application example described above, it is preferable that the first opening and the second opening are installed with the projection lens device interposed therebetween.

  According to such a projector, the first opening and the second opening are disposed with the projection lens device interposed therebetween, so that the air intake port that is disposed relative to the first opening and the second opening. And the exhaust port can be separated. As a result, it is possible to reduce intake of warm inside air exhausted from the exhaust port through the intake port again. Therefore, the cooling efficiency can be maintained.

  Application Example 5 In the projector according to the application example described above, the exhaust duct is preferably installed so that the exhaust direction is opposite to the direction of the first opening.

  According to such a projector, the exhaust duct restricts the exhaust direction of the inside air exhausted from the exhaust port to be opposite to the direction of the first opening. Thereby, since the inside air exhausted from the exhaust port is exhausted in the direction away from the direction of the first opening, it is possible to further reduce the intake of the warm inside air from the first opening again. Therefore, the cooling efficiency can be further maintained.

  Application Example 6 In the projector according to the application example, it is preferable that the filter device is detachably installed.

  According to such a projector, even when an obstacle such as a wall exists in the vicinity of a surface other than one surface, the filter device can be attached and detached, so that the filter device replacement structure is less affected by the installation environment. realizable.

FIG. 2 is a plan view schematically showing a schematic configuration of the optical device of the projector according to the embodiment. The perspective view which shows a projector. The top view which shows a cooling structure typically.

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

  FIG. 1 is a plan view schematically showing a schematic configuration of an optical system of a projector 1 according to the embodiment. FIG. 1 illustrates the optical unit 2 and the screen SC, and the exterior casing 5 and the like are not illustrated. With reference to FIG. 1, the configuration and operation of the projector 1 and the configuration and operation of the optical unit 2 as an optical system will be briefly described.

  The projector 1 according to this embodiment is a device that modulates a light beam emitted from the light source device 21 based on an image signal to form image light, and enlarges and projects the image light on a screen SC or the like. The projector 1 also includes an exterior housing 5 (see FIGS. 2 and 3) that constitutes an exterior. Further, the exterior housing 5 of the projector 1 includes an optical unit 2, a cooling mechanism 6 (see FIG. 3), a power supply unit 9 (see FIG. 3), and a control unit (not shown) that controls the operation of the projector 1. A circuit unit (not shown) is provided.

  The optical unit 2 of the present embodiment separates a light beam emitted from the light source device 21 (light source lamp 211) into three color lights under the control of the control unit, and modulates each separated color light with a light modulation device. This is a unit that forms an image, combines the formed optical images for each color light with a color combining optical device, and projects the combined optical image as image light. The optical unit 2 includes a light source device 21, an illumination optical device 22, a color separation optical device 23, a relay optical device 24, an optical device 25, and a projection lens device 4 as a projection optical device. The optical unit 2 includes an optical component housing 3 that accommodates optical components and the like constituting the optical devices 21 to 25 at predetermined positions.

  The light source device 21 includes a light source lamp 211 as a light source, a reflector 212, and the like. The light source device 21 reflects the light beam emitted by the light emission of the light source lamp 211 by the reflector 212 to align the emission direction, and emits it toward the illumination optical device 22. Note that the light source lamp 211 of the present embodiment employs a discharge lamp such as an ultra-high pressure mercury lamp.

  The illumination optical device 22 equalizes the illuminance in a plane orthogonal to the illumination optical axis A with respect to the light beam emitted from the light source device 21. The illumination optical device 22 includes a first lens array 221, a second lens array 222, a polarization conversion element 223, and a superimposing lens 224. The illumination optical device 22 includes three field lenses 225. The first lens array 221 and the second lens array 222 together with the superimposing lens 224 substantially superimpose the light beam emitted from the light source device 21 on the surface of a light modulation device (liquid crystal panel 252) described later. The polarization conversion element 223 has a function of aligning randomly polarized light emitted from the second lens array 222 with approximately one type of polarized light that can be used by the liquid crystal panel 252. The field lens 225 is disposed in front of the three liquid crystal panels 252 of the optical device 25 and converts each partial light beam emitted from the second lens array 222 into a light beam parallel to the central axis.

  The color separation optical device 23 separates the illumination light beam from the illumination optical device 22 into three color lights of red (R) light, green (G) light, and blue (B) light, and supplies them to the corresponding three liquid crystal panels 252. It guides light. The color separation optical device 23 includes two dichroic mirrors 231 and 232 and a reflection mirror 233.

  In the relay optical device 24, the length of the optical path of the color light separated by the color separation optical device 23 (R light in this embodiment) is longer than the length of the optical path of other color light (G light, B light). Therefore, a decrease in light use efficiency due to light divergence or the like is prevented, and the light modulation device (in this embodiment, a light modulation device for R light) is led. The relay optical device 24 includes an incident side lens 241, a relay lens 243, and reflection mirrors 242 and 244. The optical unit 2 of the present embodiment is configured such that the relay optical device 24 guides the R light, but is not limited thereto, and may be configured to guide the B light, for example.

  The optical device 25 modulates each color light incident on each light modulation device based on an image signal to form an optical image, and synthesizes the optical image for each color light formed by the color synthesis optical device. The optical image is emitted to the projection lens device 4 as image light. The optical device 25 includes three liquid crystal panels 252, three incident-side polarizing plates 251, three emitting-side polarizing plates 254, and a cross dichroic prism 255 as a color synthesizing optical device that constitute a light modulation device. The three liquid crystal panels 252 include an R light liquid crystal panel 252R as an R light light modulation device, a G light liquid crystal panel 252G as a G light light modulation device, and a B light as a B light light modulation device. The liquid crystal panel 252B is used. Note that the three liquid crystal panels 252 constituting the light modulation device of the present embodiment adopt a transmission type. The cross dichroic prism 255 is formed in a prismatic shape having a substantially square cross section by bonding four triangular prisms.

  In the optical device 25, the three liquid crystal panels 252, the three exit-side polarizing plates 254, and the cross dichroic prism 255 are integrally configured and fixed to the optical component housing 3. Note that the three incident-side polarizing plates 251 constituting the optical device 25 are not integrally formed and are fixed to the optical component casing 3. The three incident light faces in the three directions adjacent to the cross dichroic prism 255 are configured to hold and fix the corresponding three exit-side polarizing plates 254 and three liquid crystal panels 252 via holding members (not shown). Yes.

  The projection lens device 4 has a zoom adjustment function and a focus adjustment function for incident image light, and enlarges and projects the image light formed by the optical device 25 onto the screen SC. The projection lens device 4 includes a plurality of lens groups, with one or more lenses as one lens group.

  The optical component housing 3 has a predetermined illumination optical axis A set therein, and accommodates the optical devices 21 to 25 described above at predetermined positions with respect to the illumination optical axis A. The optical devices 21 to 25 and the projection lens device 4 described above are used as optical systems for various general projectors, and thus detailed description thereof is omitted.

  FIG. 2 is a perspective view showing the projector 1. FIG. 3 is a plan view schematically showing the cooling mechanism 6. FIG. 2 shows an outline of the external appearance of the projector 1 and shows a state in which the intake cover 53 facing the first opening (intake opening 54) is removed. FIG. 3 shows the flow direction of air by the operation of the cooling mechanism 6 by arrows. The external configuration of the projector 1 and the configuration and operation of the cooling mechanism 6 will be described with reference to FIGS.

  As shown in FIG. 2, the projector 1 has an exterior housing 5 that has a substantially rectangular parallelepiped shape in appearance. Here, with respect to the exterior housing 5, the surface on which the projection lens device 4 extends is the front surface 1a, the left side surface when viewed toward the front surface 1a is the left surface 1b, and the right side surface is the right surface 1c. . Further, a surface facing the front surface 1a is a back surface 1d, an upper surface when viewed toward the front surface 1a is an upper surface 1e, and a lower surface is a lower surface 1f.

  The projector 1 includes an operation panel 51 having operation switches (not shown) for setting details of functions of the projector 1 on the upper surface 1e. A light receiving unit 52 for receiving an infrared signal from a remote controller (remote controller) is provided in the vicinity of the projection lens device 4 on the front surface 1a. An interface unit (not shown) including a plurality of connection input terminals (not shown) for inputting image signals and the like from a plurality of external electronic devices (not shown) is installed on the back surface 1d. The lower surface 1f is provided with legs (not shown) for adjusting the projection angle of the projector 1.

  The front surface 1a of the projector 1 is provided with an intake cover 53 on the right side and an exhaust cover 55 on the left side with the projection lens device 4 interposed therebetween. Accordingly, an intake opening 54 as a first opening and an exhaust opening 56 as a second opening, which will be described later, are installed with the projection lens device 4 interposed therebetween.

  The intake cover 53 is fixed to an intake cover fixing portion 531 formed in the exterior housing 5. The intake cover fixing portion 531 is formed with an intake opening 54 as a first opening. The intake opening 54 is an opening for sucking outside air outside the projector 1. Note that, in the projector 1 of the present embodiment, there is no opening for intake of outside air other than the intake opening 54.

  As shown in FIG. 3, the exhaust cover 55 is fixed to an exhaust cover fixing portion 551 formed in the exterior housing 5. The exhaust cover fixing portion 551 has an exhaust opening 56 as a second opening. The exhaust opening 56 serves as an opening for exhausting the inside air inside the projector 1. In the projector 1 of the present embodiment, no opening for exhausting the inside air is provided other than the exhaust opening 56.

  The cooling mechanism 6 is a mechanism that cools a member that generates heat inside the projector 1. As shown in FIG. 3, the cooling mechanism 6 includes a first cooling unit 61, a second cooling unit 62, a third cooling unit 63, and a fourth cooling unit 64.

  The first cooling unit 61 mainly cools the optical device 25 and the polarization conversion element 223 constituting the optical unit 2. The second cooling unit 62 cools the power supply unit 9. The power supply unit 9 includes a power supply device 91 that supplies power to each unit and a ballast 92 that supplies power to the light source device 21.

  The third cooling unit 63 cools the light source device 21. The third cooling unit 63 cools the light source device 21 by inhaling warm air (inside air) discharged into the exterior housing 5 by the operations of the first cooling unit 61 and the second cooling unit 62. The fourth cooling unit 64 uses the first cooling unit 61, the second cooling unit 62, and the third cooling unit 63 to remove the heated inside air discharged from the outside of the outer casing 5 (outside the projector 1). Exhaust. The fourth cooling unit 64 operates to cool the optical unit 2 and the power supply unit 9 and cool the IC unit (not shown) that generates heat from the circuit unit. By operating the first cooling unit 61 to the fourth cooling unit 64, the inside of the projector 1 is appropriately cooled.

  As shown in FIG. 3, the first cooling unit 61 includes a first duct 611, and the second cooling unit 62 includes a second duct 621. As shown in FIGS. 2 and 3, the first air inlet 611 </ b> A of the first duct 611 and the second air inlet 621 </ b> A of the second duct 621 are formed in the air intake opening 54 formed in the front surface 1 a of the projector 1. Installed relative to each other. Specifically, as shown in FIG. 2, the second intake port 621A is installed on the upper side (upper surface 1e side) of the intake opening portion 54, and the first intake air is placed on the lower side (lower surface 1f side) of the intake opening portion 54. A mouth 611A is installed. Thus, the first duct 611 and the second duct 621 are installed in the form of overlapping in the vertical direction in the vicinity of the intake opening 54. A filter 81 as a filter device that covers the first air inlet 611A is detachably installed at the tip of the first air inlet 611A.

  The filter 81 has a dust removal function that cleans the outside air by adhering dust contained in the outside air when the outside air is sucked. The filter 81 is configured by pleating a member having a dust removal function. When removing the filter 81, as shown in FIG. 2, first, the intake cover 53 is removed from the exterior housing 5 (the intake cover fixing portion 531). Next, the grip part 811 of the filter 81 is gripped and pulled in the direction of the front surface 1a with respect to the filter 81 that is fixed by being engaged with the tip of the first air inlet 611A. Accordingly, the filter 81 can be removed by disengaging the engaging portion (not shown) formed on the tip of the first air inlet 611A and the filter 81.

  When the filter 81 is mounted, the operation is reversed. Specifically, the grip portion 811 of the filter 81 is gripped and pressed in the direction of the back surface 1d while being engaged with the engagement portion. As a result, the filter 81 is engaged with and fixed to the tip of the first air inlet 611A. Thereafter, the intake cover 53 is attached to the intake cover fixing portion 531.

  As shown in FIG. 3, the first cooling unit 61 includes a first intake fan 71 that performs intake, in addition to the first duct 611 described above. The first intake fan 71 is installed in the vicinity of the first intake port 611 </ b> A of the first duct 611. The first duct 611 at the rear stage of the first intake fan 71 is branched into a first sub duct 612 and a second sub duct 613. In the present embodiment, the first intake fan 71 is a sirocco fan. The sirocco fan has a structure in which air taken in from the direction of the rotation axis is discharged in the direction of centrifugal force due to rotation.

  The first sub duct 612 is a duct for cooling the optical device 25. As shown in FIG. 3, the first sub-duct 612 reaches the lower region of the optical device 25 via the lower side of the optical component casing 3, and has three discharge ports 612R and 612G at the tip thereof. , 612B are formed. The discharge port 612R is formed below the R light liquid crystal panel 252R, the incident-side polarizing plate 251 positioned in the preceding stage, and the emission-side polarizing plate 254 positioned in the subsequent stage.

  Similarly, the discharge port 612G is formed below the G light liquid crystal panel 252G, the incident-side polarizing plate 251 located in the preceding stage, and the emission-side polarizing plate 254 located in the subsequent stage. Similarly, the discharge port 612B is formed below the B light liquid crystal panel 252B, the incident-side polarizing plate 251 positioned in the preceding stage, and the emission-side polarizing plate 254 positioned in the subsequent stage. Note that an opening (not shown) is formed on the lower surface of the optical component casing 3 facing the three ejection ports 612R, 612G, and 612B.

  The second sub duct 613 is a duct for cooling the polarization conversion element 223. As shown in FIG. 3, the second sub-duct 613 reaches the side surface region of the polarization conversion element 223 via the side surface of the optical component housing 3, and a discharge port 613 </ b> A is formed at the tip. An opening 31 is formed on the side surface (side surface on the back surface 1d side) of the optical component housing 3 facing the discharge port 613A. An opening 32 is also formed on the other side surface (side surface on the front surface 1 a side) of the optical component housing 3 facing the opening portion 31.

The operation of the first cooling unit 61 will be described.
As the first intake fan 71 rotates, outside air outside the exterior housing 5 is taken into the first duct 611 from the first intake port 611A via the intake cover 53 and the intake opening 54. At this time, outside air passes through the filter 81 installed in the first intake port 611A. As the outside air passes through the filter 81, dust contained in the outside air is cleaned. Accordingly, the cleaned outside air flows in the first duct 611.

  Part of the outside air that has passed through the first intake fan 71 flows into the first sub duct 612. The outside air that has flowed through the first sub duct 612 is discharged upward from the three discharge ports 612R, 612G, and 612B. The outside air discharged from the discharge port 612R blows to the liquid crystal panel 252R for R light, the incident-side polarizing plate 251 and the emission-side polarizing plate 254 of the optical device 25 located above, and blows through the upper part of the optical component casing 3. . Accordingly, the outside air takes away the heat generated in the R light liquid crystal panel 252R, the incident side polarizing plate 251 and the emission side polarizing plate 254, thereby causing the R light liquid crystal panel 252R, the incident side polarizing plate 251 and the emission to be emitted. The side polarizing plate 254 is cooled. The outside air discharged from the other outlets 612G and 612B operates in the same manner as the outside air discharged from the outlet 612R, so that the optical device 25 is cooled by the outside air flowing through the first sub duct 612.

Further, the other part of the outside air that has passed through the first intake fan 71 flows into the second sub duct 613. The outside air that has flowed through the second sub-duct 613 is discharged from the discharge port 613A to the opening 31 of the optical component casing 3. The outside air that has flowed into the optical component housing 3 from the opening 31 blows onto the side surface of the polarization conversion element 223 and blows out from the opening 32. As a result, the outside air cools the polarization conversion element 223 by taking away the heat generated by the polarization conversion element 223.
As described above, the first cooling unit 61 cools the optical device 25 and the polarization conversion element 223.

  As shown in FIG. 3, the second cooling unit 62 includes a second intake fan 72 that performs intake in addition to the second duct 621 described above. The second intake fan 72 is installed in the vicinity of the second intake port 621 </ b> A of the second duct 621. The second duct 621 at the rear stage of the second intake fan 72 is installed such that the discharge port 621B faces the power supply unit 9 (power supply device 91, ballast 92). In the present embodiment, the second intake fan 72 is an axial fan. The axial fan has a structure that discharges air taken in from the rotation axis direction in the rotation axis direction.

The operation of the second cooling unit 62 will be described.
As the second intake fan 72 rotates, outside air outside the exterior housing 5 is sucked into the second duct 621 from the second intake port 621A via the intake cover 53 and the intake opening 54. The outside air that has passed through the second intake fan 72 flows through the second duct 621 at the rear stage of the second intake fan 72 and is discharged from the discharge port 621B. The outside air discharged from the discharge port 621B is blown to the power supply unit 9 (power supply device 91, ballast 92) facing the discharge port 621B.

The power supply unit 9 is disposed in a shielding casing 901 formed in a substantially cylindrical shape. The outside air discharged from the discharge port 621B flows from one opening 901A of the housing 901, flows inside the housing 901, and generates heat generated by the electric elements (not shown) constituting the power supply device 91 and the ballast 92. Is blown out from the other opening 901B of the housing 901. Thereby, the outside air cools the power supply device 91 and the ballast 92.
Thus, the second cooling unit 62 cools the power supply unit 9.

  As shown in FIG. 3, the third cooling unit 63 includes a third intake fan 73 and a third duct 631. The third cooling unit 63 is installed across the side surfaces (side surfaces on the back surface 1d side) of the optical component housing 3 and the light source device 21. In the present embodiment, the third intake fan 73 employs a sirocco fan. The third duct 631 is installed at the rear stage of the third intake fan 73 and extends from the side surface (side surface on the back surface 1d side) of the optical component housing 3 to the side surface (side surface on the back surface 1d side) of the light source device 21. Discharge ports 631A and 631B are formed.

  The light source device 21 is accommodated in a box-shaped housing 213. An opening 213A is formed on the side surface (side surface on the back surface 1d side) of the housing 213 so as to face the light source lamp 211, and an opening 213B is formed so as to face the neck portion 212A of the reflector 212. Further, on the other side surface (side surface on the front surface 1 a side) of the housing 213, an opening 213 </ b> C is formed relative to the light source lamp 211, and an opening 213 </ b> D is formed relative to the neck portion 212 </ b> A of the reflector 212. .

  The discharge port 631A of the third duct 631 is installed facing the opening 213A of the housing 213. Further, the discharge port 631 </ b> B of the third duct 631 is installed to face the opening 213 </ b> B of the housing 213.

The operation of the third cooling unit 63 will be described.
As the third intake fan 73 rotates, the warm air (inside air) discharged into the exterior housing 5 by the operation of the first cooling unit 61 and the second cooling unit 62 and the inside air around the third intake fan 73 are displayed. And the like are sucked into the third duct 631. The inside air that has flowed through the third duct 631 is discharged from the two discharge ports 631A and 631B.

  The inside air discharged from the discharge port 631A flows into the opening 213A of the housing 213 facing the discharge port 631A. The inside air that has flowed into the housing 213 from the opening 213A flows on the inner surface side of the reflector 212 of the light source device 21, takes away the heat generated by the light source lamp 211, and blows through the opening 213C of the housing 213. Thereby, the inside air cools the light source lamp 211.

On the other hand, the inside air discharged from the discharge port 631B flows into the opening 213B of the housing 213 facing the discharge port 631B. The inside air that has flowed into the housing 213 from the opening 213B flows on the outer surface side of the reflector 212 of the light source device 21, takes heat generated around the neck 212A, and blows out from the opening 213D of the housing 213. Thereby, the inside air cools the outer surface side of the reflector 212 including the neck portion 212A.
As described above, the third cooling unit 63 cools the light source device 21.

  Note that the third cooling unit 63 removes the warm air (inside air) discharged into the exterior housing 5 by the operation of the first cooling unit 61 and the second cooling unit 62, the inside air around the third intake fan 73, and the like. The light source device 21 is cooled by using it. This is because the temperature of the light source device 21 to be cooled is higher than the temperature of the inside air, so that the temperature of the light source device 21 can be sufficiently lowered by the temperature of the inside air.

  As shown in FIG. 3, the fourth cooling unit 64 includes an exhaust duct 641 and an exhaust fan 74. The fourth cooling unit 64 is installed across the side surface (the side surface on the front surface 1 a side) of the light source device 21 and the exhaust opening 56. The exhaust fan 74 is installed in the middle of the exhaust duct 641. In this embodiment, the exhaust fan 74 is an axial fan. In the exhaust duct 641 at the front stage of the exhaust fan 74, an air inlet 641A is formed on the side surface (side surface on the front surface 1a side) of the light source device 21. An exhaust port 641 </ b> B is formed in the exhaust duct 641 at the rear stage of the exhaust fan 74 so as to face the exhaust opening 56.

  The exhaust duct 641 at the rear stage of the exhaust fan 74 is installed so that the inside air flowing through the exhaust duct 641 is in the opposite direction to the direction of the intake opening 54 (first opening). Specifically, in the present embodiment, the exhaust duct 641 is installed with the exhaust duct 641 tilted so as to be opposite to the direction of the intake opening 54.

The operation of the fourth cooling unit 64 will be described.
As the exhaust fan 74 rotates, warm air (inside air) discharged into the exterior housing 5 by the operation of the first cooling unit 61, the second cooling unit 62, and the third cooling unit 63 is sucked and exhausted. The air flows into the duct 641. The inside air that has flowed inside the exhaust duct 641 is discharged (exhausted) from the exhaust port 641B to the outside of the exterior casing 5 (outside the projector 1) through the exhaust opening 56 and the exhaust cover 55. The exhaust direction when the inside air is exhausted to the outside of the projector 1 is opposite to the direction of the intake opening 54 (first opening). Specifically, the exhaust direction is exhausted in a direction inclined in the left surface 1b direction with respect to the front surface 1a.

  In addition to the warm air (inside air) discharged into the exterior housing 5 by the operation of the first cooling unit 61, the second cooling unit 62, and the third cooling unit 63, by rotating the exhaust fan 74, For example, air (inside air) warmed by heat generated by an IC (not shown) of the circuit unit, for example, inside the exterior housing 5 is also sucked and discharged (exhaust) in the same manner from the exhaust port 641B.

  As described above, the fourth cooling unit 64 operates to exhaust the warm air (inside air) inside the exterior housing 5 to the outside of the projector 1, thereby cooling the optical unit 2 and the power supply unit 9. The IC (not shown) that generates heat from the circuit unit and other members are also cooled.

According to the embodiment described above, the following effects can be obtained.
In the projector 1 of the present embodiment, a first opening (intake opening 54) and a second opening (on the front surface 1a (surface facing the screen SC) of the exterior housing 5 from which the projection lens device 4 extends are provided. And an exhaust opening 56). A first intake port 611A (first duct 611) and a second intake port 621A (second duct 621) are provided opposite to the intake opening 54. Further, an exhaust port 641B (exhaust duct 641) is provided opposite to the exhaust opening 56. Thereby, since it can be used in a situation where there is a low probability that an obstacle that inhibits intake and exhaust by the cooling mechanism 6 exists, intake and exhaust can be performed reliably. Therefore, it is possible to realize the projector 1 that is less affected by the installation environment and can maintain the cooling efficiency. In other words, even if there are obstacles on each surface (left surface 1b, right surface 1c, back surface 1d, top surface 1e, bottom surface 1f) other than the front surface 1a of the projector 1, the intake and exhaust can be reliably performed, Efficiency can be maintained. Further, the degree of freedom of installation of the projector 1 can be expanded.

  The projector 1 according to the present embodiment includes a first air inlet 611A (first duct 611) and a second air inlet 621A (second duct 621) relative to the air intake opening 54. A filter 81 that cleans the outside air is provided in the first intake port 611A, which is one of them. Then, the cleaned outside air sucked through the first duct 611 is blown to the liquid crystal panel 252, the incident side polarizing plate 251, the emission side polarizing plate 254, and the polarization conversion element 223 which are optical components that affect the optical image. Can be cooled. As a result, dust contained in the outside air can be prevented from adhering to the optical component (appropriate cooling can be performed), so that the projection of the shadow caused by dust on the projected optical image can be suppressed. Therefore, it is possible to maintain the quality of the projected image.

  In the projector 1 according to the present embodiment, the first suction port 611A (first duct 611) and the second suction port 621A (second duct 621) are likely to leak noise, such as the cooling sound of the cooling fan and the vibration sound accompanying the rotation. ) To be opposed to the first opening (intake opening 54) installed on the front surface 1a from which the projection lens device 4 extends. Similarly, an exhaust port 641B (exhaust duct 641) is provided opposite to a second opening (exhaust opening 56) installed in the front surface 1a. Thereby, when the viewer is not positioned between the projection lens device 4 and the screen SC, the noise is not directly transmitted to the viewer, and it is difficult to recognize the noise, so that the noise can be reduced. it can.

  In the projector 1 according to the present embodiment, two air intake ports (first air intake port 611A and second air intake port 621A) that easily leak the cooling sound of the cooling fan and the vibration sound associated with the rotation are installed on the front surface 1a. By providing it in opposition to the first opening (intake opening 54), it is possible to reduce noise compared to providing the first intake 611A and the second intake 621A on separate surfaces. be able to. Further, in the present embodiment, there is no opening for intake of outside air other than the intake opening 54, and no opening for exhausting inside air is provided other than the exhaust opening 56. . Therefore, noise reduction can be achieved as compared with the case where an intake opening and an exhaust opening are provided on different surfaces and an intake port and an exhaust port are provided opposite to the opening.

  In the projector 1 according to the present embodiment, the first opening (intake opening 54) and the second opening (exhaust opening 56) are provided with the projection lens device 4 interposed therebetween, whereby the intake opening. The first intake port 611A and the second intake port 621A that are installed to face the gas outlet 54 and the exhaust opening 56 can be separated from the exhaust port 641B. Thereby, it is possible to reduce the intake of warm inside air exhausted from the exhaust port 641B through the first intake port 611A and the second intake port 621A again. Therefore, the cooling efficiency can be maintained and appropriate cooling can be performed.

  In the projector 1 of the present embodiment, the exhaust direction of the inside air exhausted from the exhaust port 641B is regulated so as to be opposite to the direction of the first opening (intake opening 54). Thereby, since the inside air exhausted from the exhaust port 641B is exhausted in a direction away from the direction of the intake opening 54, it is possible to further reduce the intake of the warm inside air from the intake opening 54 again. Therefore, the cooling efficiency can be further maintained, and further appropriate cooling can be performed.

  In the projector 1 of the present embodiment, the filter 81 is detachably installed at the tip of the first air inlet 611A, so that an obstacle such as a wall exists near the surface other than the front surface 1a. The filter 81 can be attached and detached, and an exchange structure for the filter 81 that is hardly affected by the installation environment can be realized.

  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.

  In the projector 1 according to the embodiment, the first opening (intake opening 54) and the second opening (exhaust opening 56) are provided with the projection lens device 4 interposed therebetween. However, the present invention is not limited to this, and the first opening and the second opening may be arranged side by side without sandwiching the projection lens device 4.

  In the projector 1 of the embodiment described above, the first duct 611 having the first air inlet 611A and the second duct 621 having the second air inlet 621A are made to be opposed to the first opening (inlet opening 54). I have. However, the present invention is not limited to this, and three or more intake ports (intake ducts) may be provided so as to be opposed to the first opening.

  In the projector 1 of the embodiment, the cooling mechanism 6 is configured by four cooling units, but may be configured by more cooling units.

  In the projector 1 of the embodiment, the first cooling unit 61 including the filter 81 cools the optical device 25 and the polarization conversion element 223, but also cools other optical components that require cooling. Also good.

  In the projector 1 of the embodiment, the outside air that is sucked into the first duct 611 and the second duct 621 that are installed relative to the first opening (the intake opening 54) is substantially perpendicular to the front surface 1a. It is inhaled from. However, the present invention is not limited to this, and the outside air sucked into the first duct 611 and the second duct 621 is installed so as to be sucked from the opposite direction to the direction of the second opening (exhaust opening 56). May be. Specifically, the first duct 611 and the second duct 621 may be installed so as to be inclined in the opposite direction to the direction of the exhaust opening 56. As a result, the outside air is sucked in from the direction inclined in the right surface 1c direction with respect to the front surface 1a, so that the warm inside air exhausted from the exhaust opening 56 is further sucked from the intake opening 54. Can be reduced.

  In the projector 1 of the embodiment, the intake cover 53 installed so as to cover the intake opening 54 is provided with a louver or the like that regulates the intake direction of the outside air, so that the inside air exhausted from the exhaust opening 56 can be reduced. It may be difficult to inhale. Similarly, the exhaust cover 55 installed so as to cover the exhaust opening 56 is provided with a louver or the like that regulates the exhaust direction of the internal air, thereby making it difficult for the exhausted internal air to be sucked from the intake opening 54. But you can.

  In the projector 1 according to the embodiment, the optical unit 2 employs a so-called three-plate method using three light modulation devices corresponding to R light, G light, and B light. However, the present invention is not limited to this, and a single plate type light modulation device may be adopted. Further, a light modulation device for improving the contrast may be additionally employed.

  In the projector 1 of the embodiment, the optical unit 2 employs a transmissive light modulator (transmissive liquid crystal panel 252). However, the present invention is not limited to this, and a reflective light modulation device may be employed.

  In the projector 1 of the embodiment, the optical unit 2 employs a liquid crystal panel 252 as a light modulation device. However, the present invention is not limited to this, and it is generally sufficient that it modulates an incident light beam based on an image signal. For example, other types of light modulation devices such as 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.

  In the projector 1 of the embodiment, the optical unit 2 is a lens integrator optical system including a first lens array 221 and a second lens array 222 as an illumination optical device 22 that equalizes the illuminance of the light beam emitted from the light source device 21. Is adopted. However, the present invention is not limited to this, and a rod integrator optical system including a light guide rod can also be employed.

  In the optical unit 2 of the projector 1 of the embodiment, the light source lamp 211 of the light source device 21 employs a discharge lamp such as an ultrahigh pressure mercury lamp, but a laser diode, LED (Light Emitting Diode), organic EL ( Various solid light-emitting elements such as an electro luminescence element and a silicon light-emitting element may be employed.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 1a ... Front surface, 4 ... Projection lens apparatus, 5 ... Exterior casing, 6 ... Cooling mechanism, 21 ... Light source device, 54 ... Intake opening, 56 ... Exhaust opening, 71 ... 1st intake fan 72 ... second intake fan, 74 ... exhaust fan, 81 ... filter, 611 ... first duct, 611A ... first intake port, 621 ... second duct, 621A ... second intake port, 641 ... exhaust duct, 641B ... exhaust port.

Claims (6)

A light source device that emits a light beam, a light modulation device that modulates the light beam based on image information to form an optical image, a projection lens device that projects the optical image, the light source device, and the light modulation device. An external housing that is housed inside and fixed so that the projection lens device can extend from one surface,
A first opening and a second opening installed on the one surface;
A plurality of intake ducts that are installed relative to the first opening and have a plurality of air intakes for sucking outside air into the exterior housing, and for flowing the sucked outside air;
An exhaust duct installed opposite to the second opening for exhausting the inside air inside the exterior housing to the outside, and an exhaust duct for allowing the inside air to flow through the exhaust opening. Projector. The projector according to claim 1,
A projector comprising a plurality of fans that are installed in correspondence with the plurality of intake ducts and the exhaust duct and perform intake and exhaust. The projector according to claim 2,
The projector according to claim 1, further comprising: a filter device that cleans the outside air that is sucked into one of the plurality of intake ports. It is a projector as described in any one of Claims 1-3, Comprising:
The projector according to claim 1, wherein the first opening and the second opening are installed with the projection lens device interposed therebetween. It is a projector as described in any one of Claims 1-4, Comprising:
The projector is characterized in that the exhaust duct is installed so that the exhaust direction is opposite to the direction of the first opening. It is a projector as described in any one of Claims 3-5, Comprising:
The projector is characterized in that the filter device is detachably installed.

Images