JP2013041135A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that can reduce the noise and the size of an outer housing.SOLUTION: Of two double-suction-type suction fans 66G,66B, a suction fan 66G is disposed between the bottom surface of an outer housing 3 and an optical unit 50 so that the axis direction of the suction fan 66G goes along the thickness direction of the outer housing 3, and a suction fan 66B is disposed between the front of the outer housing 3 and the optical unit 50 so that the axis direction of the suction fan 66B is orthogonal to the thickness direction of the outer housing 3.

Description

  The present invention relates to a projector.

In a projector provided with an optical unit that projects an image according to image information onto a projection surface such as a screen and an exterior housing that accommodates the optical unit therein, a heat generating component such as a liquid crystal light valve is cooled. Is provided with a cooling device (see, for example, Patent Document 1).
In addition, in order to shorten the distance between the projector and the projection surface, a so-called ultra-short focus type projector that projects an image light after reflecting an image by a reflection mirror is known.

JP 2008-242135 A

Incidentally, in recent years, the above-described conventional projector has been demanded to further reduce the size of the exterior casing, particularly the width dimension, in order to improve the merchantability. However, since the projector has a relatively large intake fan, it is necessary to secure an installation space for the intake fan, which makes it difficult to reduce the size of the exterior casing.
On the other hand, it is conceivable to replace the intake fan with a relatively small intake fan. However, if a small intake fan tries to secure the same intake air amount as a large intake fan, the number of revolutions increases and noise increases. There is a problem of end.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a projector capable of reducing noise and reducing the size of an exterior casing.

  In order to solve the above problems, a projector according to the present invention includes a light source device that emits a light beam, a plurality of light modulation devices that modulate the light beam according to image information, and a light beam modulated by the light modulation device. An optical unit having a projection optical device that projects onto a projection surface; an exterior housing that houses the optical unit; and a plurality of intake fans that respectively correspond to the light modulation devices; The light source device is disposed on one side in the width direction of the exterior housing, the light modulation device is disposed on the other side in the width direction, and the projection optical device is disposed in the front-rear direction on the other side in the width direction of the exterior housing. The plurality of intake fans include two double-suction type intake fans that draw in both axial directions, and an intake port is provided on a side surface on the other side in the width direction of the exterior casing. The above Of the two suction type intake fans, one fan is disposed between one surface in the thickness direction of the outer casing and the optical unit so that its axial direction is along the thickness direction of the outer casing. The other fan is arranged between one surface in the front-rear direction of the outer casing and the optical unit so that the axial direction thereof is orthogonal to the thickness direction of the outer casing. Yes.

  According to the present invention, between the optical unit that does not affect the downsizing of the width dimension of the outer casing and one surface in the thickness direction of the outer casing, and one of the optical unit and the outer casing in the front-rear direction. By providing a double-suction type intake fan between the two surfaces, it is possible to effectively use the dead space and prevent an increase in the dimension in the width direction of the exterior casing. In addition, by providing a double-suction type intake fan, the intake air volume can be increased compared to a single-suction type intake fan. It is possible to reduce the noise by reducing the rotational speed of the suction type intake fan. In the case of a double-suction type intake fan, it is necessary to enclose the intake fan with a casing or the like to prevent the inhalation of dust, but the intake air is between the optical unit and one surface in the thickness direction of the exterior housing. By disposing the fan, a sufficient space for installing a casing or the like can be secured.

In addition, it is preferable that a fan storage portion that covers the double-suction type intake fan with a predetermined space is provided on a side opposite to the optical unit side of the double-suction type intake fan.
According to the present invention, the double-suction type intake fan is provided on the opposite side to the optical unit side with the fan storage portion that covers the double-suction type intake fan with a predetermined space. The intake capacity can be improved even if the type of intake fan intake section is directly connected to the intake port on only one side. Therefore, since the intake air amount can be increased, when driven with the same intake air amount as that of the single suction type intake fan, the rotational speed of the double suction type intake fan can be reduced to reduce noise.

Further, it is preferable that a duct for guiding cooling air to the corresponding light modulation element of the light modulation device is connected to the plurality of intake fans.
According to the present invention, since the plurality of intake fans are disposed at positions relatively close to the light modulation device, the duct length can be shortened to reduce the channel resistance, and the cooling efficiency by the intake fans can be improved.

The duct is preferably routed between one surface in the thickness direction of the exterior casing and the optical unit.
ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the planar size of an exterior housing | casing increases using the space between the optical unit and one surface of the thickness direction of an exterior housing | casing effectively.

Moreover, it is preferable that the intake port is provided with a partition that separates intake routes to the plurality of intake fans.
According to the present invention, since the intake port is separated for each of the plurality of intake fans by the partition wall, for example, due to a difference in the number of rotations of each intake fan when sucking air from the outside, a difference in intake performance, etc. It is possible to suppress the fans from affecting each other's intake air amount.
Moreover, it is preferable that an air filter is provided at the intake port.
According to the present invention, dust and the like entering from the outside of the exterior housing can be removed.

It is a figure which shows the usage example of the projector which concerns on this embodiment. It is the perspective view which looked at the said projector from the front of the top | upper surface part side. It is the perspective view which looked at the said projector from the back of the top | upper surface part side. It is the perspective view which looked at the said projector from the back of the bottom face part side. It is a perspective view of the state which removed the cover member of the said projector. It is the disassembled perspective view which looked at the optical unit accommodated in a housing main-body part from the rear surface part side. It is sectional drawing which shows typically the internal structure of the said optical unit. It is a perspective view which shows the state which accommodated the said optical unit in the housing main-body part. It is the top view which looked at the inside of the exterior housing | casing 3 from the top | upper surface part 11 side. It is a perspective view which shows each duct of each intake fan. It is a perspective view which shows the state which fixed the intake fan to the casing.

  Embodiments of the present invention will be described below with reference to the drawings. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size. In the drawings used below, the arrow FR indicates the front of the projector 1, the arrow UP indicates the upper side of the projector 1, and the arrow RH indicates the right side of the projector 1.

FIG. 1 is a diagram illustrating a usage example of the projector 1 according to the present embodiment.
The projector 1 projects an image corresponding to image information received from a PC (Personal Computer) or the like onto the projection surface SC by irradiating the projection surface SC such as a screen with a light beam PL.
As shown in FIG. 1, for example, the projector 1 has a bottom surface portion 12 on the side opposite to the top surface portion 11 in a horizontal direction from the wall surface H above the projection surface SC, with the top surface portion 11 facing downward. Is supported by a metal fitting 2 extending in the direction. The metal fitting 2 has an arm portion 2a that can be expanded and contracted in a direction away from and approaching the wall surface H, and the distance from the wall surface H to the projector 1 can be adjusted by the expansion and contraction of the arm portion 2a. The projector 1 can also be placed on the floor surface with the top surface portion 11 facing upward and project an image onto the projection surface SC.

2 is a perspective view of the projector 1 as viewed from the front on the top surface portion 11 side, and FIG. 3 is a perspective view of the projector 1 as viewed from the rear on the top surface portion 11 side. FIG. 4 is a perspective view of the projector 1 as viewed from the rear on the bottom surface portion 12 side.
The projector 1 includes an exterior housing 3 made of, for example, a synthetic resin that constitutes the exterior thereof. The exterior housing 3 has a top surface portion 11 on the upper side which is one side in the thickness direction and a bottom surface portion 12 on the lower side which is the other side. The exterior housing 3 includes a left side surface portion 13 on the left side that is one side in the width direction, a right side surface portion 14 on the right side that is the other side, a front surface portion 15 on the front side that is one side in the front-rear direction, and a rear side that is the other side. The rear surface portion 16 is provided. The front-rear direction is a direction in which the projector 1 is separated from and brought close to the projection surface SC by the metal fitting 2.

  A concave portion 17 having a substantially V-shaped cross section extending in the width direction is formed on the top surface portion 11 on the rear surface portion 16 side of the center in the front-rear direction. The recess 17 has a first inclined surface 18 disposed on the rear side and a second inclined surface (inclined surface) 19 disposed on the front side. On the top surface portion 11, an operation panel 25 is provided on the right side within the range from the rear surface portion 16 to the first inclined surface 18. The operation panel 25 is provided with a plurality of keys for operating the projector 1.

  The first inclined surface 18 is formed with an opening 21 on the left side surface portion 13 side for allowing an image reflected by a reflecting member 59 of the optical unit 50 described later, that is, a light beam PL to pass therethrough. The opening 21 is disposed on the bottom surface 12 side of the outermost position (not shown) which is the outermost side in the thickness direction of the exterior casing 3, and the periphery of the opening 21 is the inner side of the exterior casing 3. It is formed so as to be inclined. The light beam PL that has passed through the opening 21 is projected obliquely upward from the rear side of the exterior housing 3 to the front side. A second opening 24 in which a camera 23 for detecting the movement of a laser pointer (not shown) operated by the user is disposed on the first inclined surface 18 is formed on the right side of the opening 21 described above. . The projector 1 has a function of superimposing and displaying a line indicating the locus of the laser pointer on the image projected on the projection surface SC based on the imaging result of the camera 23.

  The second inclined surface 19 is an inclined surface for avoiding the light beam PL projected from the opening 21 described above, and is positioned in the projection direction of the light beam PL with respect to the opening portion 21 with respect to the thickness direction of the exterior casing 3. And inclined. More specifically, the second inclined surface 19 is connected at its rear edge to the lower edge of the first inclined surface 18 on the most bottom surface portion 12 side, and is separated from the bottom surface portion 12 toward the projection direction of the light beam PL. It is formed to be inclined.

  The left side surface portion 13 is formed with a first intake port 32 and a second intake port 33 in which a plurality of slit-shaped openings 31 are arranged in a substantially rectangular range, arranged side by side in the front-rear direction. The first intake port 32 is located on the side of the second inclined surface 19, and the second intake port 33 is on the front side of the first intake port 32 and slightly on the top surface part 11 side of the first intake port 32. It is shifted and arranged. An intake opening / closing lever 34 is disposed in the space above the first intake opening 32 and behind the second intake opening 33.

  The right side surface portion 14 has a plurality of slit-shaped openings at positions substantially opposite to the first air intake port 32 and the second air intake port 33, in other words, behind the optical axis of the light source device 51 of the optical unit 50 described later. An exhaust port 36 in which 35 is arranged in a substantially rectangular range is formed. An exhaust fan unit 47 (see FIG. 6) for exhausting the cooling air taken into the exterior housing 3 at once is attached to the exhaust port 36.

  On the rear surface portion 16, a speaker mesh portion 38 in which a plurality of round holes 37 are arranged in a substantially rectangular range is formed at a rear position on the top surface portion 11 side of the operation panel 25. A speaker unit S (see FIG. 9) is arranged inside the mesh portion 38, and an audio output from the speaker unit S is transmitted to the outside of the exterior casing 3 via the mesh portion 38. Yes.

  A plurality of bosses 39 are formed on the bottom surface portion 12, and these bosses 39 are arranged at positions facing a plurality of mounting seats (not shown) of the arm portions 2 a of the metal fitting 2, and the bosses 39 are armed. The projector 1 can be supported by the wall surface H via the metal fitting 2 to be in a so-called wall-hanging state or a ceiling-suspended state by bringing the mounting seat of the portion 2a into contact and fastening with screws or the like. Further, a maintenance lid 40 is detachably attached to the bottom surface portion 12 on the front surface portion 15 side. The lid body 40 is formed so as to protrude downward from the bottom surface portion 12, and the protruding portion is disposed on the front surface portion 15 side of the portion avoiding the portion where the projector 1 is supported by the metal fitting 2. Yes. The protruding portion of the lid 40 is disposed in a gap generated between the metal fitting 2 and the bottom surface portion 12 in a state where the projector 1 is supported by the metal fitting 2, and the above-described gap can be effectively used. (See FIG. 1). The lid body 40 has a horizontal plane 41 and supports the exterior casing 3 from below together with the convex portion 42 on the front side of the bottom surface portion 12 when the projector 1 is placed on the floor surface. Functions as a leg.

FIG. 5 is a perspective view of the projector 1 with the cover member 43 removed.
As shown in FIG. 5, the exterior casing 3 includes a wall portion 43 a that forms a part on the right side of the first inclined surface 18, a wall portion 43 b that forms a part on the right side of the second inclined surface 19, and a right side surface portion. A cover member 43 having a wall portion 43c that constitutes a part of the rear side of the 14 exhaust ports 36 is detachably provided. The cover member 43 is detachable from the side with respect to the case body 44 of the exterior case 3. A bottom opening 45 for cable insertion is formed on the bottom surface portion 12 side of the cover member 43, and an interface portion 46 having a plurality of external terminals is provided on the housing body 44 side inside the cover member 43. It is arranged.

FIG. 6 is an exploded perspective view of the optical unit 50 housed in the housing main body 44 of the projector 1 as viewed from the rear surface 16 side.
The optical unit 50 shown in FIG. 6 constitutes the apparatus main body of the projector 1 and is accommodated in the case main body 44 that can be divided into upper and lower parts. The apparatus main body includes an optical unit 50, a cooling mechanism that cools the optical unit 50 and the power supply unit, a power supply unit (not shown) that supplies power to the optical unit 50 and the cooling mechanism, and the optical unit 50, A power supply unit, a control unit (not shown) that performs drive control of the cooling mechanism, and the like are provided.

  The optical unit 50 includes a light source device 51, a uniform illumination optical device 52 that uniformizes the light beam PL from the light source device 51, a color separation optical device 53 that separates red, green, and blue color lights, and color separation. A light modulation device 55 that modulates and combines the light beams PL separated by the optical device 53 according to image information input from the outside for each color light, and projection optics that projects the combined light beams PL onto the projection surface SC. The apparatus 56 etc. are provided.

  Here, a light source device 51 is arranged on the front surface 15 side, which is one side in the front-rear direction of the exterior housing 3, on the right side surface 14 side, which is one side in the width direction of the exterior housing 3, and the width direction of the exterior housing 3 A color separation optical device 53 and a light modulation device 55 are disposed on the left side surface portion 13 side which is the other side. Further, a projection optical device 56 is disposed on the left side surface side so as to extend in the front-rear direction. That is, the optical unit 50 is formed in a substantially L shape when viewed from the top surface portion 11 or the bottom surface portion 12 side. In FIG. 6, only the lower case of the housing main body 44 is shown, and the reference numeral “47” is an exhaust fan unit disposed inside the exhaust port 36.

FIG. 7 is a schematic diagram schematically showing an optical system of the optical unit 50.
The light source device 51 emits a light beam PL toward the uniform illumination optical device 52. The light source device 51 includes a light source device main body 51A having a light source lamp 511 and a reflector 512 as a light source, a collimating lens 513, and a housing member 514 that houses and integrates these members 511 to 513 inside. Composed. The light source lamp 511 emits a light beam PL in the width direction of the exterior casing 3. In FIG. 7, the symbol “A” indicates the optical axis of the light beam PL.

  The uniform illumination optical device 52 is an optical system for illuminating the light beam PL emitted from the light source device 51 substantially uniformly on the image forming area of the liquid crystal light valve 551 as a light modulation element constituting the light modulation device 55. . The uniform illumination optical device 52 includes a first lens array 521, a second lens array 522, a polarization conversion element 523, and a superimposing lens 524. The field lens 525 converts each partial light beam emitted from the second lens array 522 into a light beam parallel to the central axis (principal ray).

  The color separation optical device 53 includes two dichroic mirrors 531 and 532 and a reflection mirror 533, and a plurality of partial light beams emitted from the uniform illumination optical device 52 by the dichroic mirrors 531 and 532 are converted into red, green, and blue. It has a function of separating into three color lights. The dichroic mirror 531 separates blue light, and the blue light is reflected by the reflection mirror 533 and guided to the liquid crystal light valve 551B. The dichroic mirror 532 separates green light and red light, and the green light is guided to the liquid crystal light valve 551G. The color separation optical device 53 further includes a relay optical device 54. The relay optical device 54 includes an incident side lens 541, a relay lens 543, and reflection mirrors 542 and 544, and has a function of guiding the red light separated by the color separation optical device 53 to the liquid crystal panel 551R of the light modulation device 55. ing.

The light modulation device 55 modulates the incident light beam PL emitted from the light source device 51 according to image information. The light modulation device 55 includes three liquid crystal light valves 551 (a liquid crystal light valve for red light 551R, a liquid crystal light valve for green light 551G, and a liquid crystal light valve for blue light 551B), The liquid crystal light valve 551 includes an incident-side polarizing plate 552 and an emitting-side polarizing plate 553 that are disposed on the light incident side and the light emitting side, respectively.
The color synthesizing optical device 554 synthesizes the light beams PL modulated by the light modulation devices 55 of the respective colors, and is constituted by a cross dichroic prism 554.

FIG. 8 is a cross-sectional view schematically showing the internal configuration of the projection optical device 56.
As shown in FIG. 8, the projection optical device 56 includes a plurality of lenses 58 to which the light beam PL from the light source device 51 through the light modulation device 55 is incident, and a reflection surface 59 </ b> A that reflects the light beam PL from the lens 58. And a housing member 60 that houses the lens 58 and the reflective member 59.
The reflection surface 59A includes a concave surface, and the reflection member 59 is an aspherical mirror (hereinafter, the reflection member 59 is appropriately referred to as an aspherical mirror 59). The reflection surface 59A is a free-form reflection surface that is not rotationally symmetric, and the aspherical mirror 59 is disposed so that the reflection surface 59A faces obliquely upward at the most downstream side of the optical path in the projection optical device 56. The aspherical mirror 59 reflects the light beam PL guided by the plurality of lenses 58, folds it obliquely upward in FIG. 8, and widens the angle.

The projection opening 61 and the opening 21 are arranged on the upper side of the housing member 60 and can pass the light beam PL reflected by the aspherical mirror 59. The projection optical device 56 is installed inside the exterior housing 3 so that the light PL reflected by the aspherical mirror 59 can pass through the projection opening 61 and the opening 21 on the upper side of the housing member 60. The aspherical mirror 59 (reflecting surface 59A) reflects the light beam PL from the lens 58 and guides it to the projection opening 61 and the opening 21. The projection opening 61 is closed by a transmission member 22 that can transmit the light beam PL. The light beam PL from the reflection member 59 passes through the transmission member 22 of the projection opening 61, then passes through the opening 21, and is emitted to the external space of the exterior casing 3.
The projection opening 61 is formed in the vicinity of the condensing point P where the light beam PL reflected by the reflecting surface 59A of the aspherical mirror 59 condenses, whereby the area of the projection opening 61 can be reduced. Yes.

FIG. 9 is a top view of the interior of the exterior housing 3 as viewed from the top surface 11 side.
As shown in FIG. 9, an air filter 65 that removes dust and the like from the sucked air is attached to the first air inlet 32 and the second air inlet 33 described above. The air filter 65 is unitized by integrally forming the air filter 65 for the first air inlet 32 and the air inlet 65 for the second air inlet 33.

  Inside the exterior housing 3 are housed three intake fans 66R, 66G, and 66B that constitute a cooling mechanism. The intake fans 66R, 66G, and 66B correspond to the liquid crystal light valves 551R, 551G, and 551B of the optical unit 50, respectively. The intake fan 66R supplies cooling air to the liquid crystal light valve 551R, and the intake fan 66G Cooling air is supplied to the liquid crystal light valve 551G, and the intake fan 66B supplies cooling air to the liquid crystal light valve 551B. The cooling air supplied by these intake fans 66R, 66G, and 66B cools the liquid crystal light valves 551R, 551G, and 551B, respectively, and then the exhaust fan unit 47 disposed on the rear side of the optical axis of the light source device 51 causes the exterior casing 3 to It is discharged outside.

  The intake fan 66R is a so-called single-suction centrifugal fan (in other words, a sirocco fan) that can suck air from one suction part 661R in the axial direction, and the suction part 661R faces the first intake port 32. It is disposed between the projection optical device 56 and the first air inlet 32. The intake fan 66G and the intake fan 66B are so-called double suction centrifugal fans (in other words, sirocco fans) that can suck air from the suction portions 661R, 662R, 661G, and 662G on both axial sides. Of the two double-suction type centrifugal fans, one intake fan 66G has a bottom surface portion 12 which is one surface in the thickness direction of the outer casing 3 so that its axial direction is along the thickness direction of the outer casing 3. The other intake fan 66B is disposed between the front unit 15 which is one surface in the front-rear direction of the exterior housing 3 so that the axial direction thereof is orthogonal to the thickness direction of the exterior housing 3. It is arranged between the optical unit 50. In FIG. 9, the axes of intake fan 66R and intake fan 66B are indicated by alternate long and short dash lines. Reference numeral “66 </ b> L” is a light source cooling fan for cooling the light source device 51.

FIG. 10 is a perspective view showing the respective ducts of the intake fans 66R, 66G, and 66B.
As shown in FIG. 10, the ducts 67R, 67G, and 67B corresponding to the intake fans 66R, 66G, and 66B are arranged along the bottom surface portion 12 so as to be routed between the optical unit 50 and the bottom surface portion 12. So as to extend.
The intake outlet 68R of the intake fan 66R is disposed on the bottom surface portion 12 side and opens toward the intake fan 66G side. The duct 67R connected to the intake outlet 68R is curved inward in the width direction of the exterior housing 3 and opens toward the top surface 11 at a position on the bottom surface 12 side of the red liquid crystal light valve 551R. The portion 69R is open.

  The intake outlet 68G of the intake fan 66G is disposed on the intake fan 66R side, and is open to face the inner side in the width direction of the exterior housing 3. The duct 67G connected to the intake outlet 68G extends toward the inner side in the width direction of the exterior housing 3 and opens toward the top surface portion 11 at a position on the bottom surface portion 12 side of the green liquid crystal light valve 551G. The portion 69G is open.

  The intake outlet 68B of the intake fan 66B is opened obliquely rearward on the inner side in the width direction of the exterior housing 3. The duct 67 </ b> B connected to the intake outlet 68 </ b> B extends obliquely rearward on the inner side in the width direction of the exterior housing 3, and then curves toward the rear surface portion 16 side of the exterior housing 3. Then, after extending to the rear surface portion 16 side, an opening 69B is opened toward the top surface portion 11 side at a position on the bottom surface portion 12 side of the blue liquid crystal light valve 551B. The ducts 67R, 67G, and 67B described above are integrally formed in the vicinity of the openings 69R, 69G, and 69B.

  From the pipe portion 71 connected to the intake fan 66B in the duct 67B, a polarization conversion element pipe portion 72 that guides cooling air to the polarization conversion element 523 is branched. More specifically, the duct 67 </ b> B connected to the intake fan 66 </ b> B includes a branch duct 73 that extends from the radially outer side of the curved portion to the position on the bottom surface portion 12 side of the polarization conversion element 523. A polarization conversion element tube portion 72 for guiding cooling air for cooling the polarization conversion element 523 is provided. The branching duct 73 has an opening 74 that opens toward the top surface 11 at a position on the bottom surface 12 side of the polarization conversion element 523. In FIG. 10, the casing 75 is omitted for convenience of illustration.

FIG. 11 is a perspective view showing a state in which the intake fans 66R, 66G, and 66B are fixed to the casing 75. FIG.
As shown in FIG. 11, the intake fans 66R, 66G, and 66B are fixed to the casing 75 through screws or the like and unitized. The casing 75 has a peripheral wall portion 76 that surrounds the periphery of the air filter 65 described above. The end edge of the peripheral wall portion 76 abuts the entire periphery of the air filter 65 to prevent the cooling air from being sucked through the air filter 65.

  Further, the casing 75 includes partition walls 77 and 78 that separate the intake routes to the intake fans 66R, 66G, and 66B from each other. The edges of the partition walls 77 and 78 are in contact with the air filter 65. With this configuration, the intake route in the casing 75 is separated and sucked into the intake fans 66R, 66G, and 66B. The air is sucked from each region corresponding to the intake fans 66R, 66G, and 66B in the entire region of the air filter 65.

The casing 75 includes double-suction fan storage portions 79 and 80 that cover the double-suction type intake fans 66G and 66B. As shown in FIG. 11, the intake fan 66G and the intake fan 66B can only see the suction portions 661G and 661B on one side when viewed from the second intake port 33 side. That is, only the suction portions 661G and 661B on the optical unit 50 side are directly sucked from the second suction port 33. The opposite suction portions 662G and 662B are covered with fan storage portions 79 and 80 with a predetermined space. By being covered with a space, air that has not been sucked into the suction portions 661G and 661B facing the second suction port 33 through the second suction port 33 through the suction portions 662G and 662B on the opposite side is also sucked. The air is sucked into the fans 66G and 66B. Therefore, even if the suction part of both suction type intake fans 66G and 66B communicates directly with the second intake port 33 only on one side, the intake capacity is improved.
Further, since the suction fans 66G and the suction fan 66B are covered by the both suction fan storage portions 79 and 80, the air sucked by the suction fans 66G and 66B is not sucked from the inside of the exterior casing 3. Substantially all of the air is sucked from the outside of the outer casing 3 through the air filter 65.

According to the projector 1 of the present embodiment described above, since the intake fan 66R can be disposed between the projection optical device 56 and the first intake port 32, the projection optical device 56 and the first intake port 32 are separated from each other. The dead space between them can be used effectively, and the increase in the dimension of the exterior casing 3 in the width direction can be prevented.
In addition, by storing the suction portions 662G and 662B on the opposite side (the opposite side to the optical unit 50 side) of the double suction type intake fans 66G and 66B on the second intake port 33 side in the fan storage portions 79 and 80, respectively. The intake capacity can be improved even if the intake portions 661G and 661B of the intake fans 66G and 66B are directly connected to the second intake port 33 only on one side. Therefore, since the amount of intake air can be increased, when driven with the same amount of intake air as that of a single suction type intake fan, the rotational speed of both suction type intake fans 66G and 66B is reduced to reduce noise. Can do.
Further, a double-suction type intake fan 66G is provided between the optical unit 50, which is a position that does not affect the downsizing of the width dimension of the outer casing 3, and the bottom surface portion 12 of the outer casing 3, and the optical unit 50 and the outer casing are provided. By providing a double-suction type intake fan 66B between the front surface portion 15 of the housing 3, even if the double-suction type intake fans 66G and 66B requiring installation space are installed, the merchantability of the projector 1 is sacrificed. Thus, the cooling efficiency of the projector 1 can be improved.
In the case of the double suction type intake fans 66G and 66B, it is necessary to enclose the intake fans 66G and 66B with the casing 75 for preventing the inhalation of dust, but the optical unit 50 and the bottom surface portion 12 of the exterior casing 3 By arranging between the optical unit 50 and between the optical unit 50 and the front surface portion 15 of the outer casing 3, a sufficient space for installing the casing 75 can be secured.

  Further, since the intake fans 66R, 66G, and 66B are disposed at positions relatively close to the light modulation device 55, the duct length is shortened to reduce the channel resistance, and the cooling efficiency by the intake fans 66R, 66G, and 66B is improved. Can be made.

  Since the polarization conversion element tube section 72 branches off from the tube section 71 of the duct 67B to which the intake fan 66B is connected, the polarization conversion element 523 is also cooled by using the intake fan 66B that cools the liquid crystal light valve 551B. can do. As a result, as compared with the case where an intake fan for the polarization conversion element is provided, the number of parts can be reduced to prevent the apparatus from becoming complicated, and the exterior casing 3 can be downsized. In addition, as compared with the case where only one single suction type intake fan is used to cool both the liquid crystal light valve 551 and the polarization conversion element 523, one double suction type intake fan having a large intake air amount is used. By using only this, the rotational speed of the intake fan 66B can be suppressed, so that noise can be reduced.

Since the intake ports are separated for each of the intake fans 66R, 66G, and 66B by the partition walls 77 and 78, for example, the difference in the rotation speed of the intake fans 66R, 66G, and 66B when the air is sucked from the outside, and the intake performance It is possible to suppress the intake fans 66R, 66G, 66B from affecting each other's intake air amount due to a difference or the like.
In addition, since the ducts 67R, 67G, and 67B are routed between the optical unit 50 and the bottom surface portion 12, the space between the optical unit 50 and the bottom surface portion 12 can be effectively used to An increase in the plane size can be prevented.
Furthermore, dust or the like entering from the outside of the exterior housing 3 can be reliably removed by the air filter 65.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

DESCRIPTION OF SYMBOLS 3 ... Exterior housing | casing, 32 ... 1st inlet port, 33 ... 2nd inlet port, 50 ... Optical unit, 51 ... Light source device, 53 ... Color separation optical device, 55 ... Light modulation device, 56 ... Projection optical device, 65 ... Air filter, 66R, 66G, 66B ... intake fan, 67R, 67G, 67B ... duct, 71 ... pipe part, 72 ... polarization conversion element pipe part, 77, 78 ... partition wall, SC ... projection surface, PL ... light beam

Claims (6)

A light source device that emits a luminous flux;
A plurality of light modulation devices for modulating the light flux according to image information;
An optical unit having a projection optical device that projects a light beam modulated by the light modulation device onto a projection surface;
An exterior housing that houses the optical unit;
A plurality of intake fans respectively corresponding to the light modulation devices;
The light source device is disposed on one side in the front-rear direction of the exterior housing and the width direction one side of the exterior housing, and the light modulation device is disposed on the other side in the width direction,
On the other side in the width direction of the exterior casing, the projection optical device is arranged extending in the front-rear direction,
The plurality of intake fans include two double-suction intake fans that draw in both axial directions,
An intake port is provided on the side surface on the other side in the width direction of the outer casing,
Of the two double suction type intake fans, one of the fans is formed between the one surface in the thickness direction of the outer casing and the optical unit so that the axial direction thereof is along the thickness direction of the outer casing. The other fan is disposed between one surface in the front-rear direction of the outer casing and the optical unit so that the axial direction thereof is orthogonal to the thickness direction of the outer casing. Projector featuring.   2. A fan housing portion is provided on the opposite side to the optical unit side of the double-suction type intake fan to cover the double-suction type intake fan with a predetermined space. Projector.   The projector according to claim 1, wherein a duct that guides cooling air to a corresponding light modulation element of the light modulation device is connected to the plurality of intake fans.   The projector according to claim 3, wherein the duct is routed between one surface in the thickness direction of the exterior casing and the optical unit.   5. The projector according to claim 1, wherein a partition wall that separates intake routes to the plurality of intake fans from each other is provided at the intake port. 6.   The projector according to claim 1, wherein an air filter is provided at the intake port.

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