JP2003287815A - Casing for optical components, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casing for optical components which allows easy replacement of optical components without affecting the positional accuracy of other parts, and to provide a projector. <P>SOLUTION: The light guide 47 includes a lower light guide 471 which supports a field angle correction filter plate 448 and an incident side polarizing plate 442, and an upper light guide 472 which positions and fixes the field angle correction filter plate 448 and the incident side polarizing plate 442. Openings 610, 611 and 612 which expose the contour ends of the field angle correction filter plate 448 and the incident side polarizing plate 442 are formed at the upper light guide 472. A first spring member 500 and a second spring member 510 for energizing the field angle correction filter plate 448 and the incident side polarizing plate 442 which are exposed from the openings 610, 611 and 612 toward the lower light guide 471 are formed separately from the upper light guide 472 at the side of the openings 610, 611 and 612. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores a plurality of optical components such as lenses and mirrors, and arranges these optical components on a predetermined illumination optical axis set inside the optical components. The present invention relates to an optical component casing including a support-side casing portion that supports the optical component and a fixed-side casing portion that positions and fixes the plurality of optical components, and a projector.

[0002]

2. Description of the Related Art Conventionally, in presentations at conferences, academic societies, exhibitions, etc., a projector has been used which modulates a light beam emitted from a light source in accordance with image information to form an optical image, which is magnified and projected. There is. As such a projector, a three-plate type projector having three light modulators is known.

In the optical system of this three-plate type projector, the luminous flux emitted from the light source is made uniform in irradiation surface intensity by the illumination optical system, and is separated into three color lights of red light, green light and blue light by the color separation optical system. Then, each color light is modulated by the light modulation device, and then the color lights after the modulation are combined by the color combining optical system, and the color image is enlarged and projected from the projection optical system. Here, the illumination optical system includes an integrator lens that divides the light beam emitted from the light source into a plurality of partial light beams and a condenser lens that collects the partial light beams, and the color separation optical system includes a dichroic mirror that separates the light beams into three color lights. It is necessary to accurately arrange these in the optical path from the light source to the light modulator. In addition to this, the optical system of the projector also includes a relay lens, a field lens, and an incident-side polarization plate arranged on the incident side of the light modulation device, and these must also be accurately arranged in the optical path.

For this reason, conventionally, a housing for optical components called a light guide has been used in order to house these plural optical components into an integrated optical unit.
The optical component housing includes a support-side housing portion that houses and supports a plurality of optical components, and a fixed-side housing portion that positions and fixes the plurality of optical components supported by the support-side housing portion. The configured and housed optical component is accurately pressed and positioned on the internal illumination optical axis by being pressed and urged toward the support-side housing portion by the fixed-side housing portion.

By the way, as an optical component housed in such an optical component casing, there is one in which an optical conversion film made of an organic material is formed on a transparent substrate such as glass. For example, the above-mentioned polarizing plate is obtained by sticking a stretched film containing iodine on a transparent substrate such as glass,
The viewing angle correction plate is made by attaching a viewing angle correction film on a transparent substrate, and these optical components are positioned and fixed by the pressing force of the fixed-side casing, like other optical components. It was An optical component including an optical conversion film made of such an organic material may be deteriorated by heat from a light source and may not retain its original function, and the optical component may need to be replaced. In this case, conventionally, the fixed-side housing portion was removed and the optical component was replaced.

[0006]

However, when the fixed-side casing is removed and the optical parts are replaced, the pressing and urging states of the other optical parts are also released. There is a problem that the position of the component deviates from the illumination optical axis in the optical component casing. In particular, optical components of the imaging optical system, such as an integrator lens and a condenser lens, have poor optical performance when they are displaced from the illumination optical axis, and there is a problem that these lenses must be adjusted again.

It is an object of the present invention to provide an optical component casing and a projector that can easily replace optical components without affecting the positional accuracy of other components.

[0008]

In order to achieve the above object, the optical component casing of the present invention accommodates a plurality of optical components such as lenses and mirrors, and has a predetermined illumination optical axis set therein. In order to arrange these optical components in the optical component housing, an optical component housing including a support-side housing portion that supports the plurality of optical components and a fixed-side housing portion that positions and fixes the plurality of optical components. An opening is formed in the fixed-side casing to expose the outer shape end of at least one of the optical components, and the optical component exposed from the opening is provided on the opening-side. A biasing member that biases toward the body side,
It is characterized in that it is provided separately from the fixed-side housing section.

According to the present invention as described above, the fixed casing is formed with the opening for exposing the outer end of at least one of the optical components. Since the optical components can be housed and removed without moving, the positional accuracy of other components is not affected. A biasing member that biases the optical component exposed from the opening toward the support-side housing portion is provided on the opening-side, separately from the fixed-side housing portion. As a result, the urging member urges to fix the optical component to the supporting-side housing portion. Therefore, when replacing the optical component, it is possible to remove the optical component and replace the optical component by simply removing the biasing member.
The optical parts can be easily replaced as compared with the case where the fixed-side casing part itself is removed and the optical parts are replaced.

In the optical component casing of the present invention, the supporting casing is provided with a color combining optical device including a prism for combining and emitting a plurality of incident color lights and a fixing plate for fixing the prism. It is preferable that a mounting portion is provided, and the biasing member is mounted to the support-side housing portion at this mounting portion. According to this, the supporting-side housing section has the mounting section for mounting the color combining optical device including the prism and the fixing plate, and the biasing member is mounted to the supporting-side housing section by this mounting section. By doing so, the color synthesizing optical device and the biasing member are fixed at one place at the mounting portion, so the number of parts for fixing the color synthesizing optical device and the biasing member is reduced, and the structure is simplified. be able to. Further, since the color synthesizing optical device and the biasing member can be fixed and removed by a single operation, the work of fixing and removing can be simplified.

In the optical component casing of the present invention, a plurality of the opening portions are formed in the fixed side casing portion, and the biasing member is provided with each of the optical components exposed from the plurality of opening portions. It is preferable to encourage. According to this, one biasing member can fix the optical components exposed from the plurality of openings, so that the number of components for fixing the optical components can be reduced, and thus the material cost can be reduced. .

In the optical component casing of the present invention, the opening is formed so as to expose outer end portions of the plurality of optical components, and the biasing member is exposed from the openings. Is preferably activated. According to this, the material cost can be reduced in the same manner as described above.

In the optical component casing of the present invention, the optical component exposed from the opening preferably includes a transparent substrate and an optical conversion film made of an organic material formed on the transparent substrate. . Here, the optical conversion film is made of an organic material, and the film itself may be deteriorated by the light or heat from the light source to lose its original function, and the optical component may need to be replaced. Therefore, according to the optical component casing, the optical component can be easily replaced, and thus it is suitable as an optical component of the optical component casing.

In the optical component casing of the present invention, it is preferable that the optical conversion film is a polarization conversion film that converts random polarized light into linear polarized light. Here, as the polarization conversion film,
For example, a film in which fine crystals of quinine persulfate sulfate are aligned and dispersed in a cellulose acetate film, a stretched film in which iodine is adsorbed in a polyvinyl alcohol film, and the like can be mentioned. When converting randomly polarized light into linearly polarized light, heat accumulates in the film, and the film is likely to deteriorate. It is also easily deteriorated by ultraviolet rays. Therefore, since the frequency of exchanging the optical component is high, the merit of using the optical component as the optical component of the casing is great.

A projector of the present invention is a projector for modulating a light beam emitted from a light source in accordance with image information to form an optical image, and enlarging and projecting the same, and is provided with the above-mentioned optical component casing. It is characterized by Here, when replacing or repairing the parts of the projector, it is desirable that the other parts are not affected, for example, misalignment of the optical axis alignment, etc., as much as possible. The projector itself is configured by a complex combination of a plurality of components in addition to the optical component casing. That is, it is further desired to have a structure capable of exchanging parts so as not to give vibration even a little. Therefore, if the projector includes the above-described optical component housing, the optical components can be easily replaced, and the projector can be more easily maintained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. [1. Main Configuration of Projector] FIG. 1 is a perspective view of a projector 1 according to the present invention viewed from an upper front side. FIG. 2 is a perspective view of the projector 1 viewed from the lower back side. As shown in FIG. 1 or 2,
A substantially rectangular parallelepiped outer case 2 formed by injection molding
Equipped with. The outer case 2 is a housing made of synthetic resin that houses the main body of the projector 1, and includes an upper case 21 and a lower case 22. The cases 21 and 22 are configured to be detachable from each other. There is.

As shown in FIGS. 1 and 2, the upper case 21 includes an upper surface portion 21A, a side surface portion 21B, a front surface portion 21C and a rear surface portion 21D which respectively constitute an upper surface, a side surface, a front surface and a rear surface of the projector 1. Composed. Similarly, as shown in FIGS. 1 and 2, the lower case 22 also includes a lower surface portion 22A, a side surface portion 22B, a front surface portion 22C, which form a lower surface, a side surface, a front surface, and a rear surface of the projector 1, respectively.
And a back surface portion 22D.

Therefore, as shown in FIGS. 1 and 2, side surfaces 21B and 22B of the upper case 21 and the lower case 22 in the rectangular parallelepiped outer case 2 are continuously connected to each other to form a side surface portion 210 of the rectangular parallelepiped. Similarly, the front portion 220 is formed by connecting the front portions 21C and 22C to each other.
However, the back portion 230 is formed by connecting the back portions 21D and 22D to each other.
However, due to the upper surface portion 21A, the upper surface portion 240 is
The lower surface portions 250 are constituted by A, respectively.

As shown in FIG. 1, an operation panel 23 is provided on the front side of the upper surface portion 240, and a speaker hole 240 for outputting sound is provided near the operation panel 23.
A is formed.

The right side portion 210 when viewed from the front is
An opening 211 is formed across the two side surface portions 21B and 22B. Here, a main board 51 and an interface board 52, which will be described later, are provided in the outer case 2, and a connecting portion 51B mounted on the main board 51 is provided via an interface panel 53 attached to the opening 211. And the connecting portion 52A mounted on the interface board 52 are exposed to the outside. External electronic devices and the like are connected to the projector 1 at these connecting portions 51B and 52A.

In the front part 220, two front parts 2 are provided on the right side when viewed from the front and near the operation panel 23.
A circular opening 221 straddling 1C and 22C is formed. A projection lens 46 is arranged inside the outer case 2 so as to correspond to the opening 221. At this time, the tip portion of the projection lens 46 is exposed to the outside from the opening 221, and the focus operation of the projection lens 46 can be manually performed via the lever 46A which is a part of the exposed portion.

In the front portion 220, the opening 221
An exhaust port 222 is formed at a position on the opposite side.
A safety cover 222A is formed on the exhaust port 222.

As shown in FIG. 2, a rectangular opening 231 is formed in the rear portion 230 on the right side when viewed from the rear surface, and the inlet connector 24 is exposed from this opening 231.

In the lower surface portion 250, a rectangular opening 251 is formed at the center position on the right end side when viewed from below. A lamp cover 25 that covers the opening 251 is detachably provided in the opening 251. By removing the lamp cover 25, a light source lamp (not shown) can be easily replaced.

Further, in the lower surface portion 250, a rectangular surface 252 which is recessed inward by one step is formed at a corner portion on the left side and the rear surface side when viewed from below. An intake port 252A for intake of cooling air from the outside is formed on the rectangular surface 252. An intake port cover 26 that covers the rectangular surface 252 is detachably provided on the rectangular surface 252. The intake port cover 26 has an opening 26A corresponding to the intake port 252A.
Are formed. An air filter (not shown) is provided in the opening 26A to prevent dust from entering the inside.

Further, on the lower surface portion 250, a rear leg 2R which constitutes a leg portion of the projector 1 is formed at a substantially central position on the rear side. Further, front legs 2F that also constitute legs of the projector 1 are provided at the left and right front corners of the lower surface portion 250, respectively. That is, the projector 1 is supported by the rear leg 2R and the two front legs 2F at three points. Each of the two front legs 2F is configured to be able to move forward and backward in the vertical direction, and the position of the projected image can be adjusted by adjusting the inclination (posture) of the projector 1 in the front-rear direction and the left-right direction.

Further, as shown in FIGS.
A rectangular parallelepiped recess 253 is provided at a substantially central position on the front side of the outer case 2 so as to straddle 50 and the front portion 220.
Are formed. The concave portion 253 has the concave portion 253.
A cover member 27 that covers the lower side and the front side and is slidable in the front-rear direction is provided. By the cover member 27, the recess 253 houses a remote controller (remote controller) (not shown) for remotely operating the projector 1.

3 and 4 are perspective views showing the inside of the projector 1. Specifically, FIG. 3 is a diagram in which the upper case 21 of the projector 1 is removed from the state of FIG. FIG. 4 is a diagram in which the control board 5 is removed from the state of FIG.

As shown in FIGS. 3 and 4, the outer case 2 has a power supply unit 3 arranged along the back surface and extending in the left-right direction, and a substantially L-shape in plan view arranged on the front side of the power supply unit 3. The optical unit 4 serves as an optical system, and the control board 5 as a control unit is arranged above and to the right of these units 3 and 4. Each of these devices 3
The main body of the projector 1 is composed of 5 to 5.

The power supply unit 3 includes a power supply 31 and a lamp driving circuit (ballast) (not shown) arranged below the power supply 31. The power supply 31 supplies power supplied from the outside through a power cable (not shown) connected to the inlet connector to the lamp drive circuit, the control board 5, and the like. The lamp drive circuit supplies electric power supplied from a power source 31 to a light source lamp (not shown in FIGS. 3 and 4) that constitutes the optical unit 4, and is electrically connected to the light source lamp. Such a lamp driving circuit can be configured by wiring on a substrate, for example.

The power supply 31 and the lamp drive circuit are arranged substantially in parallel vertically, and the space occupied by these extends in the left-right direction on the rear side of the projector 1.
Further, the power supply 31 and the lamp driving circuit are provided with a shield member 31 made of metal such as aluminum and having left and right openings.
Surrounded by A. Shield member 31A
In addition to its function as a duct for guiding cooling air,
It also has a function of preventing electromagnetic noise generated in the power supply 31 and the lamp drive circuit from leaking to the outside.

As shown in FIG. 3, the control board 5 is arranged so as to cover the upper side of the units 3 and 4, and the CPU and the connecting portion 5 are arranged.
A main board 51 including 1B and the like, and an interface board 52 disposed below the main board 51 and including a connecting portion 52A are provided. In this control board 5, the connecting portion 51
The CPU or the like of the main board 51 controls a liquid crystal panel forming an optical device described later according to the image information input via B and 52A.

The main board 51 is covered with a metal shield member 51A. Shield member 51
Although difficult to understand in FIG. 3, A is in contact with the upper end portion 473 (FIG. 4) of the upper light guide 472 that constitutes the optical unit 4.

[2. Detailed Configuration of Optical Unit] Here, FIG. 5 is an exploded perspective view showing the optical unit 4.
FIG. 6 is a diagram schematically showing the optical unit 4. As shown in FIG. 6, the optical unit 4 optically processes the light flux emitted from the light source lamp 416 forming the light source device 411 to form an optical image corresponding to image information, and enlarges the optical image. Is a unit for projecting the light, an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an optical device 44, a projection lens 46, and a composite housing these optical components 41 to 44, 46. And a resin light guide 47 (FIG. 5).

The integrator illumination optical system 41 includes three liquid crystal panels 441 (liquid crystal panels 441R, 441G, and 4 for red, green, and blue color lights, respectively) that constitute the optical device 44.
41B) and an optical system for illuminating the image forming area substantially uniformly, and 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. Equipped with.

The light source device 411 includes a light source lamp 416 as a radiation light source and a reflector 417, and reflects the radial rays emitted from the light source lamp 416 into the reflector 41.
It is reflected at 7 to be a parallel light beam, and this parallel light beam is emitted to the outside. A high-pressure mercury lamp is used as the light source lamp 416. In addition to the high pressure mercury lamp, a metal halide lamp, a halogen lamp or the like can be adopted. Further, a parabolic mirror is adopted as the reflector 417. Instead of the parabolic mirror, a combination of a parallelizing concave lens and an ellipsoidal mirror may be adopted.

The first lens array 412 has a structure in which small lenses having a substantially rectangular contour when viewed in the optical axis direction are arranged in a matrix. Each small lens splits the light flux emitted from the light source lamp 416 into a plurality of partial light fluxes. The contour shape of each small lens is the liquid crystal panel 44.
It is set so as to be substantially similar to the shape of the first image forming area. For example, if the aspect ratio (ratio of horizontal and vertical dimensions) of the image forming area of the liquid crystal panel 441 is 4: 3, the aspect ratio of each small lens is also set to 4: 3.

The second lens array 413 has substantially the same structure as the first lens array 412, and has a structure in which small lenses are arranged in a matrix. This second lens array 413, together with the superposing lens 415,
The image of each small lens of the lens array 412 is displayed on the liquid crystal panel 44.
1 has an image forming function.

The polarization conversion element 414 is arranged between the second lens array 413 and the superimposing lens 415 and is unitized with the second lens array 413. The polarization conversion element 414 as described above converts the light from the second lens array 413 into one type of polarized light, and thus the light utilization efficiency in the optical device 44 is improved.

Specifically, the polarization conversion element 414 outputs 1
Each of the partial lights converted into the polarized light of the type has a superposition lens 41.
Finally, it is almost superimposed on the liquid crystal panel 441 of the optical device 44. Since only one type of polarized light can be used in the projector 1 using the liquid crystal panel 441 that modulates polarized light, approximately half of the luminous flux from the light source lamp 416 that emits other types of randomly polarized light is not used. Therefore, by using the polarization conversion element 414, all the light fluxes emitted from the light source lamp 416 are converted into one type of polarized light, and the light utilization efficiency in the optical device 44 is improved. Such a polarization conversion element 414 is introduced, for example, in Japanese Patent Laid-Open No. 8-304739.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423. The dichroic mirrors 421 and 422 divide a plurality of partial light beams emitted from the integrator illumination optical system 41 into red (R). ), Green (G), and blue (B).

The relay optical system 43 includes an incident side lens 431.
, Relay lens 433, and reflection mirrors 432, 434
And has a function of guiding the red light, which is the color light separated by the color separation optical system 42, to the liquid crystal panel 441R.

At this time, in the dichroic mirror 421 of the color separation optical system 42, the red light component and the green light component of the light flux emitted from the integrator illumination optical system 41 are transmitted, and the blue light component is reflected. The blue light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 418, and reaches the blue liquid crystal panel 441B. This field lens 4
Reference numeral 18 converts each partial light flux emitted from the second lens array 413 into a light flux parallel to the central axis (chief ray) thereof. The same applies to the field lens 418 provided on the light incident side of the other liquid crystal panels 441G and 441R.

Of the red light and the green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422 and the field lens 41
8 to reach the liquid crystal panel 441G for green.
On the other hand, the red light passes through the dichroic mirror 422, passes through the relay optical system 43, and further passes through the field lens 4
The liquid crystal panel 441R for red light is reached through 18. The relay optical system 43 is used for red light because the optical path length of red light is longer than the optical path lengths of other color lights, so that the reduction of light utilization efficiency due to light divergence or the like is prevented. This is because. That is, the partial light flux that has entered the incident side lens 431 is directly transmitted to the field lens 418. Note that the relay optical system 43 is configured to pass red light of the three color lights, but is not limited to this, and may be configured to pass blue light, for example.

The optical device 44 modulates the incident light flux according to image information to form a color image,
Three incident side polarization plates 442 on which the respective color lights separated by the color separation optical system 42 are incident, a viewing angle correction filter plate 448 for correcting the viewing angle, and lights arranged at the subsequent stage of each incidence side polarization plate 442. Liquid crystal panels 441R and 44 as modulators
1G, 441B and each liquid crystal panel 441R, 441G,
An exit-side polarization plate 443 arranged in the latter stage of 441B and a cross dichroic prism 44 as a color combining optical system.
4 and.

Liquid crystal panels 441R, 441G, 441B
For example, a polysilicon TFT is used as a switching element. In the optical device 44, the respective color lights separated by the color separation optical system 42 are supplied to the three liquid crystal panels 441R, 441G, 441B and the incident side polarization plate 44.
2 and the emission side polarization plate 443 are modulated according to image information to form an optical image.

The incident side polarization plate 442 is the color separation optical system 42.
It transmits only the polarized light in a certain direction out of the respective color lights separated by (1) and absorbs the other light flux, and has a polarizing film attached to a transparent substrate such as sapphire glass.

The viewing angle correction filter plate 448 is a transparent substrate such as sapphire glass to which a film for correcting the viewing angle is attached.

The exit side polarization plate 443 is also the entrance side polarization plate 44.
The liquid crystal panel 441 (441R,
Among the light fluxes emitted from the light sources 441G and 441B), only the polarized light in a predetermined direction is transmitted and the other light fluxes are absorbed. The incident side polarization plate 442 and the emission side polarization plate 443 are set such that the directions of their polarization axes are orthogonal to each other.

The cross dichroic prism 444 is
The color image is formed by combining the optical images emitted from the emission side polarization plate 443 and modulated for each color light.
The cross dichroic prism 444 is provided with a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light in a substantially X shape along the interfaces of the four rectangular prisms. Three color lights are combined by the multilayer film.

The liquid crystal panel 441, the exit side polarization plate 443 and the cross dichroic prism 444 described above.
Is configured as an optical device body 45 that is integrally unitized. FIG. 7 is a perspective view showing the optical device body 45. As shown in FIG. 7, the optical device body 45 includes a cross dichroic prism 444, a fixing plate 447 made of synthetic resin fixed to the upper surface of the cross dichroic prism 444, and the cross dichroic prism 4
The exit side polarization plate 44 is attached to the light flux incident end surface of
Holding plate 446 made of metal for holding 3 and holding plate 44
6, a liquid crystal panel 441 (4
41R, 441G, 441B). Holding plate 44
6 and a liquid crystal panel 441 are provided with a gap at a predetermined interval, and cooling air is allowed to flow through this gap. The optical device body 45 is screwed and fixed to the lower light guide 471 through the round holes 447B of the four arms 447A formed on the fixing plate 447.

The projection lens 46 enlarges and projects the color image combined by the cross dichroic prism 444 of the optical device 44. The light guide 47
As shown in FIG. 5, each optical component 412 to 415, 41
8, 421 to 423, 431 to 434 and 442 are provided with a lower light guide 471 formed with a groove for slidingly fitting from above, and a lid-shaped upper light guide 472 that closes an upper opening of the lower light guide 471. Consists of

As shown in FIG. 5, a light source device 411 is housed at one end of the lower light guide 471 having a substantially L shape in plan view. A projection lens 46 is screwed and fixed to the other end side via a head portion 471A formed on the lower light guide 471.

Further, as shown in FIG. 5, the optical device body 45 housed in the lower light guide 471 is screwed and fixed to the lower light guide 471 with the first spring member 500 and the second spring member 510 sandwiched therebetween. To be done. The two spring members 500 and 510 urge the viewing angle correction filter plate 448 and the incident side polarization plate 442 downward to fix their positions.

[3. Cooling Structure] FIG. 8 is a view in which the upper light guide and the optical device body 45 are removed from FIG. Further, FIG. 9 is a perspective view showing the optical unit 4. Here, as shown in FIGS. 8 and 9, the projector 1 includes a panel cooling system A for mainly cooling the liquid crystal panel 441.
, A polarization conversion element cooling system B mainly cooling the polarization conversion element 414, and a power supply cooling system C mainly cooling the power supply unit 3.
And a light source cooling system D that mainly cools the light source device 411.

As shown in FIG. 8, in the panel cooling system A,
A large sirocco fan 61 arranged below the power supply unit 3 is used. In the panel cooling system A, as shown in FIG. 8 or 9, by the sirocco fan 61,
Intake port 25 formed in the lower surface portion 250 of the outer case 2
External cooling air sucked from 2A (FIG. 2) is guided below the optical device body 45 by a duct (not shown), and each liquid crystal panel 441 in the lower light guide 471.
It enters into the inside of the light guide 47 from the inlet formed in the lower side. As shown in FIG. 9, the cooling air passes through the gaps between the liquid crystal panels 441R, 441G, and 441B and the cross dichroic prism 444 to cool the liquid crystal panel 441 and the exit side polarization plate, and the upper light guide. Four
It is discharged into the space between 72 and the control board. Also,
This cooling air is supplied to each of the liquid crystal panels 441R, 441G, 4
The liquid crystal panel 441 and the incident-side polarization plate are cooled through the gap between 41B and the field lens 418, and are discharged into the space between the upper light guide 472 and the control board. At this time, the air discharged into this space does not flow to the projection lens 46 side due to the contact between the upper end portion 472A of the upper light guide 472 and the control board 5.

In the polarization conversion element cooling system B, the cooling air sucked by the sirocco fan 61 is guided to the lower side of the polarization conversion element 414 by a duct (not shown) arranged below the lower light guide 471. It enters into the light guide 47 from the inlet formed on the lower side of the polarization conversion element 414 in the lower light guide 471, cools the polarization conversion element 414, and then is discharged from the outlet 474 formed in the upper light guide 472. .

In the power supply cooling system C, as shown in FIG. 8, a small sirocco fan 62 is used which is arranged above the sirocco fan 61 with a metal plate material interposed therebetween. In the power supply cooling system C, the cooling air flowing between the upper light guide 472 and the control board 5 by the panel cooling system A is
While cooling the control board 5, the sirocco fan 62 sucks it in and discharges it to the inside of the power supply unit 3. The air discharged inside flows along the shield member 31A to cool the power supply 31 and the lamp drive circuit, and is discharged from the opening on the side opposite to the sirocco fan 62.

In the light source cooling system D, the axial fan 63 arranged on the front side of the light source device 411, and the axial fan 63.
And a duct 64 attached to the. In the light source cooling system D, the air exhausted from the power source cooling system C and the polarization conversion element cooling system B is sucked by the axial fan 63, and the air is discharged from the slit-shaped opening formed in the side surface portion of the light source device 411. Light source lamp 4
16 is cooled and is discharged to the outside from the exhaust port 222 of the outer case 2 via the duct 64.

[4. Detailed Configuration of Optical Component Housing] FIG. 1
Reference numeral 0 is a light guide 47 which is a housing for optical components of the present invention.
It is an exploded perspective view showing. FIG. 11 is a perspective view showing the first spring member 500. Furthermore, FIG.
It is a perspective view showing a spring member 510. As previously mentioned,
As shown in FIG. 10, the light guide 47 includes a lower light guide 471 that serves as a support-side housing portion and an upper light guide 472 that serves as a fixed-side housing portion.

The upper light guide 472 has a U-shaped storage opening 6 for storing the optical device body 45 in plan view.
00 is formed. Further, the upper light guide 472 includes a viewing angle correction filter plate 448 and an incident side polarization plate 4.
Openings 610, 611, 6 exposing the outer edge of 42
12 are formed. These openings 610, 611,
612 are formed on the three sides of the U-shape of the storage opening 600, respectively.

Further, the upper light guide 472 is provided with two protrusions 472B on the opening 612 side of the storage opening 600. In addition, the opening 61 of the storage opening 600
Two protrusions 472B are provided between 0 and 611.

The lower light guide 471 has two mounting portions 6 for mounting the optical device body 45, which is a color combining optical device.
It has 30,631. These mounting portions 630, 6
Reference numeral 31 is a rod-shaped member that is erected on the bottom surface of the lower light guide 471, and has a screw hole in the center thereof. In addition, the mounting portion 630 is the opening 61 of the storage opening 600.
The mounting portion 631 is provided at a position orthogonal to 0 and 611.
Is provided in a portion located on a diagonal line of the mounting portion 630 of the storage opening 600.

Further, the lower light guide 471 has the opening 6
Storage grooves 475 and 476 for storing the viewing angle correction filter plate 448 and the incident side polarization plate 442 are provided on the 10 side. The incident-side polarization plate 442 is housed in the housing groove 475. The viewing angle correction filter plate 448 has a storage groove 476.
It is stored in. The other two sets of viewing angle correction filter plates 4
Although not shown, the 48 and the incident side polarization plate 442 are similarly housed in the housing grooves 475 and 476 provided on the side of the openings 611 and 612, respectively.

On the side of the openings 610, 611, 612, the viewing angle correction filter plate 448 and the incident side polarization plate 442 exposed from the openings 610, 611, 612 are biased toward the lower light guide 471. 1 spring member 5
00 and the second spring member 510 are provided separately from the upper light guide 472.

The first spring member 500 includes the optical device body 45.
Is arranged above the lower right arm 447A in the figure.
That is, the first spring member 500, the lower right arm portion 44 in the figure.
7A and the mounting portion 630 are arranged so as to vertically overlap with each other. The first spring member 500 is attached to the lower light guide 471 by the attachment portion 630 described above. The first spring member 500 has the openings 610, 61.
The viewing angle correction filter plate 448 and the incident side polarization plate 442 exposed from No. 1 are energized.

The second spring member 510 is arranged above the upper left arm 447A of the optical device body 45 in the figure. That is, the second spring member 510, the upper left arm portion 447A in the drawing, and the mounting portion 631 are arranged so as to vertically overlap with each other. Further, the second spring member 510 is attached to the lower light guide 471 by the attaching portion 631 described above. The second spring member 510 includes the viewing angle correction filter plate 448 exposed from the opening 612 and the incident side polarization plate 4.
Energize 42.

As shown in FIG. 11, the first spring member 500 comprises a base portion 501 and two arm portions 502 which are continuous with the base portion 501. Base 5
01 is a plane substantially rectangular shape. A circular hole 501A having a size corresponding to the circular hole 447B of the fixing plate 447 of the optical device body 45 is formed in the central portion of the base portion 501. The apex portion of the base portion 501 where the two arm portions 502 are not provided is rounded. Also, the two arms 5
02 and 502 form 90 degrees, are connected to the base portion 501, and are provided at positions where the base portion 501 hangs.

The arm portion 502 has a substantially trapezoidal-shaped fixing portion 503 which is continuous with the base portion 501, and the fixing portion 503 is substantially 4 times larger than the fixing portion 503.
The first spring portion 504 and the second spring portion 505 are provided so as to be inclined downward at an angle of 5 degrees.

The fixing portion 503 has a fixing hole 503A formed in a substantially central portion and fixing portion receivers 503B and 503C. The first spring member 500 has a fixing hole 503A,
Positioning is performed by inserting the protrusion 472B formed on the upper light guide 472. Fixed part receiver 50
3B is provided upward along the end of the hypotenuse portion of the fixed portion 503. The fixed portion receiver 503C is provided upward along an end portion of one side facing the fixed portion 503. The fixed portion receivers 503B and 503C are the arm portions 5.
02 is provided to improve the strength.

The first spring portion 504 includes a plate portion 504A having a spring property and a contact portion 5 provided at the tip of the plate portion 504A.
04B and receiving portions 504C and 504C provided downward along two opposing sides of the contact portion 504B. The contact portion 504B is provided with the viewing angle correction filter plate 44.
8 touches the upper cross section. The receiving portion 504C prevents the viewing angle correction filter plate 448 and the contact portion 504B from being displaced.

Similarly to the first spring portion 504, the second spring portion 505 has a spring-like plate portion 505A and a plate portion 505.
A contact portion 505B provided at the tip of A and a contact portion 505
B is provided with receiving portions 505C and 505C provided downward along two opposite sides. Contact part 505B
Touches the upper cross section of the incident side polarization plate 442. The receiving portion 504C prevents the incident side polarization plate 442 and the contact portion 505B from being displaced. First spring portion 504 and second spring portion 50
5 is different in that the plate portion 504A is longer than the plate portion 505A.

As shown in FIG. 12, the second spring member 510 comprises a base portion 511 and an arm portion 512 which is provided continuously with the base portion 511. Base 511
Is a substantially rectangular shape in a plane. A circular hole 511A having a size corresponding to the circular hole 447B of the fixing plate 447 of the optical device body 45 is formed in the center of the base portion 511. In addition, the arm 512 is connected to the base 501, and the base 501
It is provided at the position where it hangs.

The arm portion 512 includes a fixed portion 513 which is continuous with the base portion 511, and a first spring portion 514 and a second spring portion which are inclined downward from the fixed portion 513 at an angle of approximately 45 degrees. And 515. Fixed part 51
3, the portion not connected to the base portion 511 is formed in a two-step staircase shape, and the fixing hole 51 formed in the substantially central portion.
3A and fixed part receivers 513B and 513C. In addition, the stepped portion is formed by the protrusion receiving portion 51.
It is said to be 3D.

The fixing hole 513A has an upper light guide 472.
The protruding portion 472B formed on the above is inserted. The fixed portion receiver 513B includes a first spring portion 514 and a second spring portion 515.
Is provided toward the upper side along the end of the portion opposite to the portion where the is provided. The fixed portion receiver 513C is provided upward along an end portion of one side where the first spring portion 514 and the second spring portion 515 are provided. The fixed portion receivers 513B and 513C are provided to improve the strength of the arm portion 512. The protrusion receiver 513D contacts the protrusion 472B of the upper light guide 472. The second spring member 510 is positioned by the protrusion receiver 472B.

The first spring portion 514 has a plate portion 514A having a spring property and a contact portion 5 provided at the tip of the plate portion 514A.
14B and the receiving portions 514C and 514C provided downward along the two opposite sides of the contact portion 514B. The contact portion 514B is the viewing angle correction filter plate 44.
8 touches the upper cross section. The receiving portion 514C prevents the viewing angle correction filter plate 448 and the contact portion 514B from being displaced.

Similarly to the first spring portion 514, the second spring portion 515 also has a spring-like plate portion 515A and a plate portion 515.
A contact portion 515B provided at the tip of A and a contact portion 515
B is provided with receiving portions 515C and 515C provided downward along two opposite sides. Contact part 515B
Touches the upper cross section of the incident side polarization plate 442. The receiving portion 515C prevents the incident side polarization plate 442 and the contact portion 515B from being displaced. First spring portion 514 and second spring portion 51
5 is different in that the plate portion 514A is longer than the plate portion 515A.

Next, the procedure for fixing the viewing angle correction filter plate 448 and the incident side polarization plate 442 (FIG. 10) will be described. First, the optical device body 45 is attached to the lower light guide 471.
Is set in place. Then, the incident side polarization plate 44
2 is stored in the storage groove 475, and the view angle correction filter plate 44
8 is stored in the storage groove 476. Then, the upper light guide 472 is aligned with the predetermined position of the lower light guide 471.

Thereafter, the first spring member 500 is arranged above the lower right arm portion 447A of the optical device body 45 in the figure, and the second spring member 510 is above the upper left arm portion 447A of the optical device body 45 in the figure. To place. Screw 70 round hole 501
The first spring member 500 and the optical device main body 45 are screwed and fixed to the lower light guide 471 by being inserted through A, the round hole 447B, and the mounting portion 630. Similarly, screw 70 into round hole 51
1A, the round hole 447B, and the mounting portion 631 to insert the second
The spring member 510 and the optical device body 45 are fixed to the lower light guide 471 with screws. Further, at the time of fixing by screwing, the protrusions 472B corresponding to the fixing holes 503A and 513A are inserted. Also, the protrusion receiver 513
The second spring member 510 is positioned and fixed by bringing D into contact with the protrusion 472B of the upper light guide 472.

Also, the first spring portions 504, 504, 514
Is a view angle correction filter plate 448 at a predetermined position.
Touches the upper end surface of. Specifically, as shown in FIGS. 11 and 12, the contact portions 504B and 514B are in contact with the upper end surface of the viewing angle correction filter plate 448. Similarly, the second spring portions 505, 505, 515 contact the upper end surface of the incident-side polarization plate 442 at predetermined positions, respectively. Specifically, as shown in FIGS. 11 and 12, the contact portions 505B and 515B are in contact with the upper end surface of the incident side polarization plate 442.

First spring member 500 and second spring member 5
10 biases the incident side polarization plate 442 and the viewing angle correction filter plate 448, respectively. Specifically, FIGS.
2, the plate portions 504A, 5 having spring properties are shown.
05A, 514A and 515A bend and generate a biasing force. Therefore, the incident-side polarization plate 442 and the viewing-angle correction filter plate 448 are fixed to the storage grooves 475 and 476 by applying a biasing force from the upper side.

Next, a procedure (FIG. 10) for removing the viewing angle correction filter plate 448 and the incident side polarization plate 442 will be described. At this time, the first spring member 500 and the second spring member 510 are removed by removing the screw 70, and the viewing angle correction filter plate 448 and the incident side polarization plate 4 are removed.
Only 42 is removed from the storage grooves 475, 476 of the lower light guide.

According to this embodiment as described above, the following effects can be obtained. (1) The light guide 47 includes a lower light guide 471, which is a supporting-side housing portion that supports the viewing-angle correction filter plate 448, which is a plurality of optical components, and the incident-side polarization plate 442, the viewing-angle correction filter plate 448, and the incident light. The upper light guide 4 which is a fixed-side casing portion for positioning and fixing the side polarizing plate 442.
And 72. The upper light guide 472 includes a viewing angle correction filter plate 448 and an incident side polarization plate 4.
Openings 610, 611, 6 exposing the outer edge of 42
Since 12 is formed, the view angle correction filter plate 448 and the incident side polarization plate 442 can be housed and removed without moving the upper light guide 472, which affects the positional accuracy of the field lens 418 and the like. Never give.

(2) These openings 610, 611, 61
On the second side, the view angle correction filter plate 448 and the incident side polarization plate 442 exposed from the openings 610, 611 and 612 are provided.
The first spring member 500 and the second spring member 510 for urging the upper light guide 471 toward the lower light guide 471 side are
It is provided separately from 72. Therefore, when replacing the viewing angle correction filter plate 448 and the incident side polarization plate 442, the viewing angle correction filter plate 448 and the incidence side polarization plate 442 can be simply removed by removing the first spring member 500 and the second spring member 510. Removing and viewing angle correction filter plate 448
Since the incident side polarizing plate 442 can be exchanged, the viewing angle correction filter plate 448 and the incident side polarizing plate 442 can be replaced by removing the upper light guide 472 itself and exchanging the viewing angle correction filter plate 448 and the incident side polarizing plate 442. The side polarizing plate 442 can be easily replaced.

(3) The first spring member 500 and the second spring member 510 have the attachment portions 630 and 631, and the attachment portion 6 is provided.
Since the optical device main body 45, the first spring member 500, and the second spring member 510 are attached to the lower light guide 471 at 30, 631, the attachment portions 630, 63.
The optical device body 4 can be fixed at one place in each case.
5, the number of parts for fixing the first spring member 500 and the second spring member 510 is reduced, so that the structure can be simplified. Further, since the optical device main body 45, the first spring member 500, and the second spring member 510 can be fixed and removed by a single operation, the work of fixing and removing can be simplified.

(4) The openings 610, 611 and 612 are
Viewing angle correction filter plate 448 and incident side polarization plate 442
Of the first spring member 500 and the second spring member 510 are formed so as to expose the outer ends of the openings.
Since the viewing angle correction filter plate 448 and the incident side polarization plate 442 exposed from the first and the second 612 are biased, the number of parts for fixing the viewing angle correction filter plate 448 and the incidence side polarization plate 442 can be reduced, Material costs can be reduced.

(5) Since the viewing angle correction filter plate 448 and the incident side polarization plate 442 have a structure including a transparent substrate and an optical conversion film made of an organic material formed on the transparent substrate, The conversion film is made of an organic material,
The film itself is easily deteriorated by the light or heat from the light source, and it is often necessary to replace the optical component. Therefore, according to the light guide 47, the viewing angle correction filter plate 44
8 and the incident-side polarization plate 442 can be easily replaced, which is suitable as an optical component of the light guide 47.

The present invention is not limited to the above-described embodiments, and modifications and improvements within a range in which the object of the present invention can be achieved are included in the present invention. For example, as shown in FIG. 10, the sizes of the openings 610, 611, and 612 were such that the external edges of the viewing angle correction filter plate 448 and the incident side polarization plate 442 were exposed. However, the field lens 418, the viewing angle correction filter plate 448, and the incident side polarization plate 442 are biased by exposing the outer end portion of the field lens 418 arranged as shown in FIG. It may be biased to be fixed.

In addition, the specific structure, shape and the like for carrying out the present invention may be other structures and the like within the range in which the object of the present invention can be achieved.

[0090]

According to the present invention, it is possible to provide an optical component casing and a projector that can easily exchange optical components without affecting the positional accuracy of other components.

[Brief description of drawings]

FIG. 1 is a perspective view of a projector according to the present invention viewed from an upper front side.

FIG. 2 is a perspective view of the projector seen from a lower rear side.

FIG. 3 is a perspective view showing the inside of the projector,
Specifically, it is a diagram in which the upper case is removed from the state of FIG. 1.

FIG. 4 is a perspective view showing the inside of the projector,
Specifically, the control board is removed from the state of FIG.

FIG. 5 is an exploded perspective view showing an optical unit that constitutes the projector.

FIG. 6 is a diagram schematically showing the optical unit.

FIG. 7 is a perspective view showing an optical device body that constitutes the optical unit.

FIG. 8 is a perspective view for explaining a cooling system inside the projector, specifically, a view showing a cooling system with the upper light guide and the optical device body removed from FIG.

FIG. 9 is a perspective view illustrating a cooling system of the optical unit.

FIG. 10 is an exploded perspective view showing a light guide which is a housing for optical components according to the present invention.

FIG. 11 is a perspective view showing a first spring member of the optical component casing.

FIG. 12 is a perspective view showing a second spring member of the optical component casing.

[Explanation of symbols]

1 projector 45 Optical device body 442 incident side polarization plate 444 Cross Dichroic Prism 447 fixing plate 448 Viewing angle correction filter plate 471 Lower light guide 472 Upper Light Guide 500 first spring member 510 Second spring member 610, 611, 612 openings 630, 631 mounting part

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[Procedure amendment]

[Submission date] June 27, 2002 (2002.6.2)
7)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

The main board 51 is covered with a metal shield member 51A. Shield member 51
Although difficult to understand in FIG. 3, A is in contact with the upper end portion 472A (FIG. 4) of the upper light guide 472 which constitutes the optical unit 4.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (7)

[Claims] 1. A support-side casing for supporting a plurality of optical components such as lenses and mirrors, and for arranging the optical components on a predetermined illumination optical axis set inside. An optical component casing comprising a body portion and a fixed-side casing portion for positioning and fixing the plurality of optical components, wherein the fixed-side casing portion has at least one outer end portion of the optical component. And an urging member for urging the optical component exposed from the opening toward the support-side housing portion side is formed on the opening-side portion with the fixed-side housing portion. An optical component housing, which is provided separately. 2. The optical component casing according to claim 1, wherein the supporting-side casing portion includes a prism that combines a plurality of incident color lights and outputs the combined prism light, and a fixing plate that fixes the prism. A housing for an optical component, comprising a mounting portion for mounting a synthetic optical device, wherein the biasing member is mounted to the supporting-side housing portion by this mounting portion. 3. The optical component casing according to claim 1, wherein the fixed-side casing portion is formed with a plurality of the openings, and the biasing member is provided with the plurality of openings. A housing for optical parts, characterized in that each of the optical parts exposed from above is biased. 4. The optical component casing according to any one of claims 1 to 3, wherein the opening is formed so as to expose outer end portions of a plurality of optical components, and the biasing member. Is a casing for optical components, characterized in that it biases a plurality of optical components exposed from the opening. 5. The optical component casing according to claim 1, wherein the optical component exposed from the opening is made of a transparent substrate and an organic material formed on the transparent substrate. An optical component housing, comprising: 6. The optical component casing according to claim 5, wherein the optical conversion film is a polarization conversion film that converts random polarized light into linear polarized light. 7. A projector for modulating a light flux emitted from a light source according to image information to form an optical image and projecting the optical image in an enlarged scale, wherein the optical component is any one of claims 1 to 6. A projector having a housing for use.