JP2006065090A - Projector, and cover member for projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which can prevent the generation of a noise in spite of miniaturization and thickness reduction, and a cover member for the projector. <P>SOLUTION: The projector 1 is comprised of a projector body 1 A and the box-shaped cover member 8. The projector body 1 A is covered by the cover member 8 over the entire part of the base of a case and an inlet 81 is formed on the side face section of the cover member 8 and space (an air layer) is foemed in the inside of the cover member 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector and a projector cover member.

2. Description of the Related Art Conventionally, there has been known a projector that modulates a light beam emitted from a light source device with a light modulation device according to image information to form an optical image, and enlarges and projects the optical image.
In recent years, such projectors are not limited to so-called presentation uses such as presentations at conferences, academic conferences, exhibitions, and the like, but are also being developed for home theater use at home.
Such a projector includes a light source device such as a metal halide lamp or a high-pressure mercury lamp, a high-temperature part such as a power supply unit or a light source drive circuit, so that the heat of the high-temperature part does not affect the light modulation device. It is important to efficiently cool the inside of the equipment including these.
Here, since quietness is important in projectors for home theater applications, design that emphasizes quietness has been attempted by operating a plurality of sirocco fans having a specific arrangement structure at a low rotational speed ( For example, see Patent Document 1).
On the other hand, in projectors for presentation use, handling and screen visibility are emphasized, so a high-intensity light source device is used to further reduce the size.

JP 2004-138911 A

By the way, even for a projector for presentation, it is preferable that the noise be as small as possible as in the case of a home theater, and a configuration that prevents the occurrence of fan vibration and wind noise as much as possible is desired.
However, as described above, the smaller the size and the higher the brightness, the more the cooling efficiency of the device body must be improved, and the quietness must be ensured by using a large sirocco fan like a projector for home theater use. There is a problem that is difficult.

  An object of the present invention is to provide a projector and a projector cover member that can prevent the generation of noise even when the size and brightness are increased.

The projector according to the present invention includes a light source, a light modulation device that modulates a light beam emitted from the light source according to image information to form an optical image, and a projection that enlarges and projects the optical image formed by the light modulation device. A projector including a projector body including an optical system and a housing that houses therein a device body including the light source and the light modulation device, wherein the housing is used for installing the projector body. It has a bottom surface portion on which legs are provided, and a cooling air introduction port for introducing cooling air for cooling the device main body inside the housing is formed on the bottom surface portion, and is detachably fixed to the bottom surface portion. And a box-shaped cover member that covers the entire bottom surface of the housing. The cover member is formed with an air inlet that communicates the inside and outside of the cover member.
According to the present invention, the box-shaped cover member covers the entire bottom surface of the casing of the projector main body, and a space is formed inside the cover member. Therefore, even if internal noise leaks from the cooling air inlet formed in the bottom surface of the housing, it is possible to effectively prevent the sound from leaking outside the projector due to the presence of the internal space of the cover member. Even if the intake fan inside the projector body rotates and the air inside the cover member is taken in from the cooling air introduction port, and the inside of the cover member becomes negative pressure, the intake port is formed in the cover member itself. Therefore, there is no problem in the intake itself.

In the projector according to the aspect of the invention, when the cover member is attached to the projector main body, the cover member rises from a facing portion that faces the bottom surface portion of the housing and an outer peripheral end portion of the facing portion, and the bottom surface of the housing It is preferable that the air intake port is formed in the side surface portion.
There is a cooling air inlet on the bottom of the projector body housing. If the housing is placed on a soft material such as a carpet, air intake is blocked, but the cover member of the present invention is placed on the bottom surface of the housing. If fixed, the outside air can be stably sucked by the intake port formed on the side surface.

In the projector according to the aspect of the invention, a screw hole for hanging the projector main body from the ceiling is formed in the bottom surface portion of the housing, and the cover member is attached to the bottom surface portion of the housing. Sometimes, it is preferable that a through hole is formed at a position corresponding to the screw hole, and the cover member is fixed by a screw inserted through the through hole.
In the present invention, it is not necessary to provide a special means for fixing the cover member to the bottom surface of the housing, and therefore it is excellent in convenience.

In the projector according to the aspect of the invention, it is preferable that a dustproof filter is provided at the intake port.
In the present invention, by providing a dustproof filter at the air inlet of the cover member, the projector can be used for a long time even in a place where the air is dirty. In addition, you may change the coarseness of the filter provided in the cooling air inlet of a housing | casing, and the filter provided in the inlet of a cover member. For example, a coarse filter is provided at the air inlet of the cover member, large dust is captured here, and small dust that passes through this coarse filter is captured by the filter on the housing side, thereby improving the dustproof effect and filter life. Can be improved. In addition, the noise prevention effect is improved due to the presence of the dustproof filter.

In the projector according to the aspect of the invention, it is preferable that a handle is provided on the cover member.
In the present invention, the handle for carrying the projector is provided not on the housing of the projector body but on the cover member provided on the housing of the projector body. Therefore, even if the projector housing is downsized and thinned, and it is difficult to design a handle, the cover member with the handle is fixed to the projector body housing. The projector can be provided with a handle. Moreover, since the cover member is physically independent from the projector body, the degree of freedom in designing the handle is increased. In other words, the handle does not become an obstacle to downsizing the projector.

In the projector according to the aspect of the invention, it is preferable that the handle protrudes at a position corresponding to the projection lens when the cover member is attached to the projector main body.
In the present invention, when the projector is carried by holding the handle, the projection lens faces upward, and the possibility that the projection lens exposed from the casing will hit and be damaged becomes low. Conventionally, even if a handle is provided on the so-called front surface of the housing, it has been difficult to design because a projection lens, an exhaust port, and the like are located. Since the cover member in the present invention is a physically separate member from the housing of the projector body, the handle can be designed without considering the presence of a projection lens, an exhaust port, and the like.

The projector cover member of the present invention includes a light source, a light modulation device that modulates light emitted from the light source according to image information to form an optical image, and an optical image formed by the light modulation device. A projector cover member mounted on a projector main body, which includes a projection optical system for projecting and a housing that houses an apparatus main body including the light source and the light modulation device. A facing portion that is provided on a bottom surface portion of the housing, provided with a leg portion, and formed with a cooling air introduction port for introducing cooling air for cooling the device main body inside the housing, and is disposed to face the bottom surface portion. And a side surface that stands up so as to surround the facing portion, and an air inlet that communicates the inside and the outside is formed on the side surface.
According to the present invention, since the projector cover member has the above-described configuration, the same effects as those of the projector described above can be obtained.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
(1) External Configuration FIG. 1 is a perspective view of a projector 1 according to the present embodiment as viewed from the upper front side. The projector 1 includes a projector body 1A and a cover member 8. A cover member 8 provided with a handle 80 is detachably fixed to the bottom surface of the exterior case 2 (housing) of the projector main body 1A. FIG. 2 is a perspective view of the housing of the projector main body 1 </ b> A as viewed from the upper front side in a state where the cover member 8 is separated from the projector 1. FIG. 3 is a perspective view of the housing of the projector main body 1A as viewed from the lower back side.

  The projector main body 1A modulates the light beam emitted from the light source according to the image information, and enlarges and projects it on a projection surface such as a screen. As shown in FIGS. 2 and 3, the projector main body 1A includes a substantially rectangular parallelepiped outer case 2 (housing) and a projection lens 46 exposed from the housing.

  The projection lens 46 enlarges and projects an optical image modulated according to image information by the projector main body 1A. The projection lens 46 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel, and includes levers 461 and 462 (FIG. 2) that change the relative positions of the plurality of lenses, and focuses the projected image. It is configured to allow adjustment and magnification adjustment. In FIG. 1, a lens cover 463 is put on the projection lens.

  The exterior case 2 is a casing made of synthetic resin, and houses the main part of the projector main body 1A. As shown in FIGS. 2 and 3, the outer case 2 covers an upper case 11 that covers the upper part of the projector main body 1A, a lower case 12 that covers the lower part of the projector main body 1A, and a rear part of the projector main body 1A. A rear case 13 is provided. The upper case 11, the lower case 12, and the rear case 13 are fixed with screws or the like, and are configured to be detachable as appropriate.

As shown in FIGS. 1 to 3, the upper case 11 includes an upper surface portion 11A, a front surface portion 11B, a side surface portion 11C (FIG. 3), and 11D (FIG. 3) that constitute the upper surface, front surface, side surface, and rear surface of the projector main body 1A. 1 and FIG. 2) and a back surface portion 11E (FIG. 3).
Among these, the upper surface portion 11A and the front surface portion 11B are continuously formed from the upper surface to the front surface of the projector main body 1A as shown in FIG. 1 or FIG.

As shown in FIGS. 1 and 2, the upper surface portion 11A is provided with an operation panel 14 for starting and adjusting the projector body 1A so as to extend in the left-right direction, as shown in FIGS. The operation panel 14 is composed of pushbutton switches. By appropriately pressing a plurality of operation buttons 141, the operation panel 14 comes into contact with a tact switch mounted on a circuit board (not shown) arranged inside the operation panel 14, and a desired operation is performed. It becomes possible.
The circuit board of the operation panel 14 described above is electrically connected to a control board, which will be described later, and an operation signal when the operation button 141 is pressed is output to the control board. Here, the control board performs operation control of the entire projector body 1A.
Further, as shown in FIG. 2, the upper surface portion 11A has an opening that exposes the levers 461 and 462 of the projection lens 46 and allows the levers 461 and 462 to be operated, as shown in FIG. 16 is formed.

As shown in FIGS. 1 and 2, the front surface portion 11B of the upper case 11 has an exhaust port 17 formed on the left side when viewed from the front, and the air exhausted from the cooling fan disposed therein is It is discharged through the mouth 17.
A card slot 111 is provided above the exhaust port 17 so that a LAN card, a memory card, or the like can be used.
Further, in the front surface portion 11B, a substantially circular opening 18 is formed on the right side as viewed from the front. The opening 18 exposes the tip portion of the projection lens 46.
Furthermore, as shown in FIGS. 1 and 2, a remote control light receiving window 19 is formed at the upper right end portion of the front surface portion 11B when viewed from the front. Inside the remote control light receiving window 19, a remote control light receiving module (not shown) that receives an operation signal from a remote controller, which will be described later, is disposed.
A remote control light receiving module (not shown) is electrically connected to the control board, and an operation signal received by the remote control light receiving module is output to the control board. As will be described later, the remote control light receiving window and the remote control light receiving module are also provided on the back side of the projector main body 1A. And it is comprised so that remote control of the projector main body 1A can be implemented from both the front and back of the projector main body 1A using a remote controller.

  As shown in FIGS. 1 to 3, the side surface portions 11 </ b> C and 11 </ b> D are provided with uneven portions having a plurality of ribs extending in the horizontal direction from the rear to the front of the projector main body 1 </ b> A. In addition, although illustration was abbreviate | omitted, the air circulation hole which introduces external air is formed in a part of this uneven | corrugated | grooved part.

  As shown in FIGS. 1 and 3, the lower case 12 includes a bottom surface portion 12A, a front surface portion 12B, side surface portions 12C and 12D, and a back surface portion 12E that respectively constitute the bottom surface, front surface, side surface, and back surface of the projector main body 1A. Consists of.

As shown in FIG. 3, a rectangular opening 21 is formed in the bottom surface portion 12 </ b> A at a corner portion close to the side surface portion 11 </ b> C and the back surface portion 11 </ b> E of the upper case 11. A lamp cover 22 that covers the opening 21 is detachably provided in the opening 21.
In the bottom surface portion 12A, a concave portion is formed in a step shape at a position corresponding to the projection lens 46 in the projection direction of the projector main body 1A. Cooling for introducing cooling air from the outside is formed in the concave portion. An air inlet 23 is formed. The cooling air introduction port 23 is provided with an intake port cover 23A that covers the cooling air introduction port 23. A plurality of openings 23B are formed in the air inlet cover 23A. A dust filter (not shown) is provided inside these openings 23B to prevent dust from entering the inside.

  A ceiling-suspending screw hole 121 is formed at substantially the center of the left and right ends of the bottom surface portion 12A. An image can be projected by hanging the projector main body 1A from the ceiling with a predetermined screw.

Further, in the bottom surface portion 12A, a fixed leg portion 24 that constitutes a leg portion of the housing of the projector main body 1A is provided on the right side at the rear end in the projection direction of the projector main body 1A. An adjustment leg 25 that constitutes a leg of the casing of the projector main body 1A is provided. The adjustment leg portion 25 includes a screw shaft-like member that is screwed into the female screw portion formed in the lower case 12, and the inclination of the projector body 1A in the left-right direction is changed by changing the screwing position of the screw. Can be adjusted.
In addition, an adjustment leg portion 26 is provided approximately at the front center of the bottom surface portion 12A in the projection direction. The adjustment leg portion 26 includes a foot and a shaft portion, and is attached so as to be movable forward and backward in the out-of-plane direction of the bottom surface portion 12A. When the projection position is changed, the projected image formation position on the screen can be adjusted up and down by changing the advance / retreat amount of the adjustment leg 26.
Note that an air inlet 27 for introducing cooling air into the power supply unit disposed inside the housing of the projector main body 1A is formed in the approximate center of the bottom surface portion 12A.

As shown in FIG. 3, the rear case 13 is fixed by fitting into a groove portion (not shown) formed inside the back surface portion 12 </ b> E of the lower case 12, and the rear case 13 is connected to the upper case 11 and the lower case 12. The opening formed in is closed. As shown in FIG. 3, the rear case 13 includes a substantially rectangular plate 131 and a protrusion 132 that protrudes from the lower end edge of the plate 131 substantially perpendicularly to the plate 131.
Among these, the protrusion part 132 is formed so that it may protrude on the back side, as shown in FIG. The protruding portion 132 is provided with an inlet terminal 33 and a speaker hole 34.

  In a state where the upper case 11, the lower case 12, and the rear case 13 are assembled, the tip of the protruding portion 132 is connected to the upper end of the back surface portion 12 </ b> E of the lower case 12. That is, the plate 131 of the rear case 13 is spaced apart from the back of the projector body 1A to the inside.

In the rear case 13, a plurality of connection terminals 35 for inputting image signals, audio signals, and the like from an external electronic device are exposed to the plate 131. An interface board (not shown) for processing a signal input from the connection terminal 35 is disposed inside the plate body 131 located in this region. A remote control light receiving window (not shown) is formed on the left side of the connection terminal 35.
The interface board is electrically connected to the control board described above, and a signal processed by the interface board is output to the control board.

(2) Internal configuration The main part of the projector main body 1A is accommodated in the exterior case 2, and this basic part extends in the left-right direction at a substantially central part in the projection direction, and one end thereof extends forward. A substantially L-shaped optical system 4 (FIG. 4), a control board (not shown) disposed on the projection lens 46 side above the optical system 4, a power supply unit (not shown), and cooling air And a cooling unit (not shown) including a cooling fan disposed at a corner portion of the power supply unit at a position corresponding to the introduction port 23.

  As schematically shown in FIG. 4, the optical system 4 is a unit that modulates a light beam emitted from the light source device according to image information to form an optical image. The optical system 4 includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an electro-optical device 44 in which a light modulation device and a color synthesis optical device are integrated, and a color synthesis optical system. Functionally large in a cross dichroic prism 45, a projection lens 46 as a projection optical system, and an optical component casing (not shown) in which these optical components 41, 42, 43, 44, 45, 46 are accommodated. Separated.

  The integrator illumination optical system 41 is an optical system for making the luminous flux emitted from the light source uniform in the illumination optical axis orthogonal plane. As shown in FIG. 4, the integrator illumination optical system 41 includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415.

  The light source device 411 includes a light source lamp 416 as a radiation light source, a reflector 417, and an explosion-proof glass 418 that covers a light exit surface of the reflector 417. Then, the radial light beam emitted from the light source lamp 416 is reflected by the reflector 417 to be a substantially parallel light beam, and is emitted to the outside. In the present embodiment, a high-pressure mercury lamp is used as the light source lamp 416, and a parabolic mirror is used as the reflector 417. The light source lamp 416 is not limited to a high-pressure mercury lamp, and may be a metal halide lamp, a halogen lamp, or the like. Moreover, although the parabolic mirror is employ | adopted as the reflector 417, you may employ | adopt the structure which has arrange | positioned the collimating concave lens in the exit surface of the reflector which consists of an ellipsoidal mirror not only in this.

The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline when viewed from the illumination optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source lamp 416 into partial light beams and emits them in the direction of the illumination optical axis.
The second lens array 413 has substantially the same configuration as the first lens array 412, and includes a configuration in which small lenses are arranged in a matrix. The second lens array 413 has a function of forming an image of each small lens of the first lens array 412 on liquid crystal panels 441R, 441G, and 441B (to be described later) of the electro-optical device 44 together with the superimposing lens 415.

The polarization conversion element 414 converts the light from the second lens array 413 into substantially one type of polarized light, and thus the light use efficiency in the electro-optical device 44 is enhanced.
Specifically, each partial light beam converted into approximately one type of polarized light by the polarization conversion element 414 is finally substantially superimposed on liquid crystal panels 441R, 441G, and 441B (to be described later) of the electro-optical device 44 by the superimposing lens 415. Is done. In a projector using liquid crystal panels 441R, 441G, and 441B of a type that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the light flux from the light source lamp 416 that emits randomly polarized light is not used. For this reason, by using the polarization conversion element 414, the light beam emitted from the light source lamp 416 is converted into substantially one type of polarized light, and the light use efficiency in the electro-optical device 44 is increased. Such a polarization conversion element 414 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423. A plurality of partial light beams emitted from the integrator illumination optical system 41 are separated into three color lights of red (R), green (G), and blue (B) by two dichroic mirrors 421 and 422.
The dichroic mirrors 421 and 422 are optical elements on which a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam in another wavelength region is formed on a substrate. The dichroic mirror 421 disposed in the front stage of the optical path is a mirror that reflects red light and transmits other light. Further, the dichroic mirror 422 disposed at the rear stage of the optical path is a mirror that reflects green light and transmits blue light.

  The relay optical system 43 includes an incident side lens 431, a relay lens 433, a UV cut filter 434, and reflection mirrors 432 and 435. The relay optical system 43 has a function of guiding blue light, which is color light separated by the color separation optical system 42, to a liquid crystal panel 441B described later of the electro-optical device 44.

  At this time, in the dichroic mirror 421 of the color separation optical system 42, among the light beams emitted from the integrator illumination optical system 41, the green light component and the blue light component are transmitted, and the red light component is reflected. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 424, and reaches the red liquid crystal panel 441R. The field lens 424 converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 424 provided on the light incident side of the other liquid crystal panels 441G and 441B.

Of the blue light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 424, and reaches the liquid crystal panel 441G for green light. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 424, and reaches the liquid crystal panel 441B for blue light.
The reason why the relay optical system 43 is used for blue light is that the optical path length of the blue light is longer than the optical path lengths of the other color lights, thereby preventing a reduction in light use efficiency due to light divergence or the like. Because. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 424 as it is. The relay optical system 43 is configured to pass blue light out of the three color lights, but is not limited thereto, and may be configured to pass red light, for example.

  The electro-optical device 44 modulates an incident light beam according to image information to form a color image. The electro-optical device 44 includes three incident-side polarizing plates 442 on which the respective color lights separated by the color separation optical system 42 are incident, and three viewing angle correction plates 443 arranged at the subsequent stage of the incident-side polarizing plates 442. And liquid crystal panels 441R, 441G, 441B as light modulation devices and an exit-side polarizing plate 444 disposed at the subsequent stage of each viewing angle correction plate 443.

  The liquid crystal panels 441R, 441G, and 441B use, for example, polysilicon TFTs as switching elements, and the liquid crystal is hermetically sealed in a pair of transparent substrates arranged opposite to each other. Then, the liquid crystal panels 441R, 441G, and 441B modulate and emit the luminous flux incident through the incident side polarizing plate 442 and the viewing angle correction plate 443 according to image information. The liquid crystal panels 441R, 441G, and 441B are stored and held by a holding frame (not shown).

The incident side polarizing plate 442 transmits only polarized light in a certain direction out of each color light separated by the color separation optical system 42 and absorbs other light beams. A polarizing film is attached to a substrate such as sapphire glass. It has been done.
The exit side polarizing plate 444 is configured in substantially the same manner as the incident side polarizing plate 442, and transmits only polarized light in a predetermined direction among the light beams emitted from the liquid crystal panels 441R, 441G, and 441B, and absorbs other light beams. The polarization axis of the polarized light to be transmitted is set so as to be orthogonal to the polarization axis of the polarized light to be transmitted by the incident side polarizing plate 442.

  The viewing angle correction plate 443 is formed by forming an optical conversion film having a function of correcting the viewing angle of the optical image formed by the liquid crystal panels 441R, 441G, and 441B on the substrate. The viewing angle correction plate 443 compensates for the birefringence generated in the liquid crystal panels 441R, 441G, and 441B. The viewing angle correction plate 443 expands the viewing angle of the projected image and improves the contrast of the projected image.

  The cross dichroic prism 45 is a component that forms a color image by synthesizing optical images emitted from the emission-side polarizing plate 444 and modulated for each color light. In the cross dichroic prism 45, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are provided in a substantially X shape along the interfaces of four right-angle prisms. Three color lights are synthesized by the body multilayer film. The color image synthesized by the cross dichroic prism 45 is emitted from the projection lens 46 and enlarged and projected on the screen.

  The liquid crystal panels 441R, 441G, 441B, the exit-side polarizing plate 444, and the cross dichroic prism 45 described above are integrally unitized.

(3) Configuration of Cover Member 8 The cover member 8 is made of a synthetic resin like the exterior case 2 (housing) of the projector main body 1A. As shown in FIGS. 5 and 6, the cover member 8 is connected to the housing of the projector main body 1A. The connecting portion is composed of a box-like body having an opening. And the cover member 8 is provided with the facing part 8A which comprises the bottom face of a box-shaped body, and the side part 8B, 8C, 8D, 8E which stands along the outer periphery of the facing part 8A. A handle 80 is formed to protrude.

  As shown in FIG. 6, the facing portion 8 </ b> A is formed of a rectangular plate-like body, and leg portions 82 are integrally formed at four corner portions thereof. In addition, a pair of recesses 83 is formed at the approximate center of both sides of the short side of the facing portion 8A. The concave portion 83 is formed by recessing a part of the facing portion 8A in a semicircular shape inwardly in the out-of-plane direction, and penetrates the bottom surface in the out-of-plane direction of the facing portion 8A as shown in FIG. A through hole 84 is formed.

  The side portions 8B, 8C, 8D, and 8E stand up from the rectangular side of the facing portion 8A, and an intake port 81 is formed in the side portions 8B, 8D, and 8E. The intake port 81 is configured to include a plurality of slit-shaped holes along the rising direction of the side surface portions 8B, 8D, and 8E. Although not shown in FIGS. A dustproof filter is disposed so as to cover each intake port 81.

  The side surface 8B is formed with a notch 85 at a substantially central portion, corresponding to the position of the adjustment leg 26 formed on the bottom surface 12A of the projector main body 1A. Therefore, even after the cover member 8 is attached to the projector main body 1A, the adjustment leg portion 26 can change the advance / retreat amount through the notch 85, and can adjust the tilt of the projector main body 1A in the front-rear direction.

  Further, a handle 80 is integrally formed on the side surface portion 8B, and the handle 80 is joined as an arch-like member joined in the vicinity of the end portion of the side surface portion 8B, and a space for handling is formed at the center. The

Next, a method for mounting the above-described cover member 8 on the housing of the projector main body 1A will be described.
FIG. 7 is a perspective view showing a manner in which the housing of the projector main body 1A and the cover member 8 are to be mounted. As described above, the facing portion 8A of the cover member 8 has two through holes 84 formed on the bottom surface thereof. The position of the through hole 84 corresponds to the position of the ceiling suspension screw hole 121 provided in the bottom surface portion 12A of the housing of the projector main body 1A. The cover member 8 is fixed to the bottom surface portion 12A of the casing of the projector main body 1A by screws 121A inserted through the through holes 84. That is, the attachment / detachment of the cover member 8 is not a special means, but is performed by the ceiling suspension screw 121 </ b> A, which is excellent in convenience.

  The appearance of the projector 1 after fixing the cover member 8 is shown in FIG. The cover member 8 is integrated with the projector main body 1A so as to cover the entire bottom surface 12A of the housing of the projector main body 1A, and constitutes the projector 1. The cover member 8 is unified in design with the casing of the projector main body 1A, and is recognized as a part of the casing of the projector 1.

FIG. 8 is a cross-sectional view of the projector 1 after the cover member 8 is fixed. The cover member 8 covers the entire bottom surface portion 12A of the housing of the projector main body 1A, and a space (air layer) 8F exists inside. Therefore, even if the noise from the cooling fan becomes intense as a result of downsizing and increasing the brightness of the projector main body 1A and improving the cooling efficiency inside the device, the noise leaking outside from the cooling air inlet 23 is effective. Can be blocked.
In addition, since the intake port 81 is also formed in the cover member 8 itself, there is no problem in the intake performance as the projector 1.

  Further, the internal space 8F of the cover member 8 can store a power cord, various fixtures, etc., and the convenience of the projector 1 can be improved.

  As shown in FIGS. 5 to 7, since the intake port 81 of the cover member 8 is provided in the side surface portions 8B, 8D, and 8E of the cover member 8, for example, the projector 1 has a soft surface such as a carpet. Even if it is installed in a place, the air intake capability as a projector is not impaired. That is, the intake stability of the projector 1 is more excellent as compared with the state where the cover member 8 is not attached.

  Since the cover member 8 is detachably fixed to the housing of the projector main body 1A, it can be used as necessary. That is, since the cover member can be freely attached and detached, the projector can be used with the cover member removed. Therefore, when a noise prevention function is required, the cover member 8 may be fixed to the housing of the projector main body 1A and used. When compactness is given priority for reasons such as storage, the cover member should be mounted. Remove it from your body.

  Although not shown, a dustproof filter is attached to the intake port 81 of the cover member 8. Therefore, the projector can be used for a long time even in a place where the air is dirty. Further, the roughness of the filter provided at the cooling air inlet 23 of the bottom surface portion 12A of the projector main body 1A and the filter provided at the inlet 81 of the cover member 8 may be changed. For example, a coarse filter is provided at the air inlet 81 of the cover member 8, large dust is captured here, and small dust that has passed through this coarse filter is captured by the filter on the projector body 1A side, thereby preventing dust. And the filter life can be improved. In addition, the noise prevention effect is improved due to the presence of the dustproof filter.

  A handle 80 is provided on the side surface 8B of the cover member 8. When the projector is reduced in size and thickness, it becomes very difficult to determine the position where the handle is provided by design. Furthermore, it is difficult to make the handle itself sufficiently large in consideration of ease of holding. In the present embodiment, the handle 80 for carrying the projector 1 is provided not on the housing of the projector body 1A but on the side surface portion 8B of the cover member 8 fixed to the housing of the projector body 1A. Therefore, even if the projector main body 1A is downsized or thinned and it is difficult to design a handle, it is only necessary to fix the cover member 8 provided with the handle 80 to the housing of the projector main body 1A. Good. That is, by simply fixing the cover member 8 to the housing of the projector main body 1A, as a result, the projector 1 having a handle 80 that is sufficiently large and easy to hold can be obtained.

  Further, the handle 80 is provided on the side surface 8B of the cover member 8 as described above, but the side surface 8B is the side where the projection lens 46 of the projector 1 is located, that is, the front surface side. When carrying the projector 1 by holding it, the projection lens 46 faces upward. Therefore, the possibility of hitting and damaging the projection lens 46 exposed from the front surface of the projector 1 is reduced. In general, it is difficult to design a handle because there is a projection lens and an exhaust port on the front side of the projector. However, the cover member 8 constituting the projector 1 of the present invention has a housing of the projector main body 1A. Since it is a physically separate member from the body, it is not affected by the presence of the projection lens 46, the exhaust port 17, and the like.

(4) Modification of Embodiments The present invention is not limited to the above-described embodiments, but includes modifications and improvements as long as the object of the present invention can be achieved.
For example, in the above-described embodiment, the casing and the cover member 8 of the projector main body 1A are made of synthetic resin, but are not limited thereto, and may be made of metal such as an aluminum alloy. If it is made of metal, the noise prevention effect and electromagnetic wave shielding properties are further improved.

  In the above-described embodiment, the cover member 8 is unified in design with the housing of the projector main body 1A. However, the present invention is not limited to this. Since the design of the cover member 8 can be determined in consideration of the external appearance design of the housing of the projector main body 1A, it is possible to contribute to the enrichment of the assortment of projectors as products. For example, the color of the cover member 8 may be changed to the color of the housing of the projector main body 1A to obtain a two-tone color. That is, the manufacturing process of the projector main body 1A is not changed at all, and only a slight change in the manufacturing process of the cover member 8 makes it possible to increase the product lineup and build a business strategy that meets market needs.

  Furthermore, if the internal space 8F of the cover member 8 is used, various devices for improving the function of the projector main body 1A can be easily arranged. For example, the projector 1 can be used without being connected to a personal computer by disposing a DVD drive, a hard disk drive, and, if necessary, a control mechanism in the internal space 8F of the cover member 8. That is, it is possible to easily change the function and expand the function of the projector 1 simply by fixing and connecting the cover member 8 having various functions. In particular, when the projector main body 1A is reduced in size and thickness, various restrictions are imposed on the design even if various functions are incorporated in the projector, but the functions can be easily achieved by using the cover member 8. Can be extended.

  In addition, the specific structure and shape in the implementation of the present invention may be other structures as long as the object and effect of the present invention are not hindered.

  The projector of the present invention has a structure that can effectively prevent noise even when the design freedom is limited by downsizing and thinning, it is excellent in dust proofing, and is also convenient to carry. Useful.

The perspective view which looked at the projector in this embodiment from the upper front side 1 is a perspective view of the projector body with the cover member removed. The perspective view which looked at the projector main body of Drawing 2 from the lower front side Schematic diagram showing the optical system in the embodiment The perspective view which looked at the cover member in the embodiment from the upper front side The perspective view which looked at the cover member in the embodiment from the lower front side The perspective view which looked at the projector in the said embodiment from the lower front side, arranging the cover member and the projector main body side by side Sectional drawing of the projector in the embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior case (casing), 8 ... Cover member, 8F ... Internal space (air layer), 12A ... Bottom face part, 23 ... Cooling air inlet , 25 ... adjusting leg, 80 ... handle, 81 ... air inlet, 83 ... recess, 84 ... through hole, 85 ... notch, 121 ... screw hole for ceiling 121A ... Screw

Claims (7)

A light source, a light modulation device that modulates a light beam emitted from the light source according to image information to form an optical image, a projection optical system that magnifies and projects an optical image formed by the light modulation device, and the light source And a projector including a projector body including a housing that houses therein a device body including the light modulation device,
The housing has a bottom surface portion on which legs for installing the projector main body are provided,
A cooling air inlet for introducing cooling air for cooling the device main body inside the housing is formed on the bottom surface,
A box-shaped cover member that is detachably fixed to the bottom surface portion and covers the entire bottom surface portion of the housing,
The projector is characterized in that an air inlet for communicating the inside and outside of the cover member is formed in the cover member. The projector according to claim 1, wherein
When the cover member is attached to the projector main body, the facing portion that faces the bottom surface portion of the housing, and the side surface portion that stands up from the outer peripheral end portion of the facing portion and contacts the bottom surface portion of the housing And
The projector, wherein the air inlet is formed on a side surface of the cover member. In the projector according to claim 1 or 2,
A screw hole for hanging the projector main body from the ceiling is formed on the bottom surface of the housing,
The cover member has a through hole formed at a position corresponding to the screw hole when the cover member is attached to the bottom surface of the housing.
The projector is characterized in that the cover member is fixed by a screw inserted through the through hole. The projector according to any one of claims 1 to 3,
A projector characterized in that a dustproof filter is provided at the air inlet. The projector according to any one of claims 1 to 4,
A projector, wherein the cover member is provided with a handle. The projector according to claim 5, wherein
The projector is characterized in that the handle protrudes at a position corresponding to the projection lens when the cover member is mounted on the projector body. A light source, a light modulation device that modulates a light beam emitted from the light source according to image information to form an optical image, a projection optical system that magnifies and projects an optical image formed by the light modulation device, and the light source And a projector cover member mounted on a projector body including a housing that houses a device body including the light modulation device,
The projector body installation leg is provided, and attached to the bottom surface portion of the housing formed with a cooling air introduction port for introducing cooling air for cooling the device body inside the housing,
A facing portion disposed opposite to the bottom surface portion, and a side portion standing so as to surround the facing portion,
A projector cover member characterized in that an air inlet for communicating the inside and outside is formed in the side surface portion.

Images