JP3613070B2 - Enclosure for optical parts and projection display device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention generally includes a box-shaped member and a lid-shaped member that closes an opening of the box-shaped member, and an optical component housing in which a color light separation optical system is housed, and the optical component housing. The present invention relates to a projection display device using a body.
[0002]
[Background]
2. Description of the Related Art Conventionally, there has been known a projection display device including an electro-optical device that forms an optical image according to image information with a light beam emitted from a light source, and a projection lens that magnifies and projects an image formed by the electro-optical device. It is widely used for multimedia presentations at conferences, academic conferences, and exhibitions.
[0003]
Specifically, in such a projection display device, a color light separation optical system is disposed between a light source and an electro-optical device. This color light separation optical system is housed in an optical component casing (light guide) that blocks external light, and separates the light beam from the light source into three color (red, green, and blue) color lights, and then each color light. Is emitted to the electro-optical device side. The three-color images formed by the electro-optical devices by the respective color lights are emitted to the color light combining optical system (prism) and synthesized as a color image, and then supported by the metal support member (head body). The image is enlarged and projected through the projection lens.
[0004]
[Problems to be solved by the invention]
However, the projection display device may be maintained in a state where it is installed in a conference room for presentation or the like, but may be brought in as necessary, or may be moved to another place and stored at the end. Therefore, it is necessary to improve portability in order to facilitate carrying, and there is a demand for a reduction in size and weight of the device.
[0005]
The objective of this invention is providing the housing | casing for optical components which can accelerate | stimulate size reduction and weight reduction of an apparatus, and a projection type display apparatus using the same.
[0006]
[Means for Solving the Problems]
The optical component casing of the present invention is generally configured by a box-shaped member and a lid-shaped member that closes an opening of the box-shaped member, and at least a color light separation optical system is accommodated therein. And beforeCoverSectionMaterialIncludes a fixed portion for a projection lens that projects the color light from the color light separation optical system.The color light separation optical system is attached to the box-shaped member, and the polarized light of the color light from the color light separation optical system is predetermined on the lid-shaped member provided with the fixing portion for the projection lens. The electro-optical device that modulates according to the information and the color light combining optical system that combines the plurality of modulated color lights are fixed, and the optical component that constitutes the color light separating optical system is formed in the box shape by a drop-off preventing member Fixed to memberIt is characterized by this.
[0007]
According to the present invention, the optical component casing is configured.LidSince the projection member is provided with the fixing portion for the projection lens, the projection lens is directly fixed to the optical component casing. Therefore, the support member used conventionally is unnecessary, and the apparatus can be reduced in size and weight accordingly.
Furthermore, in the optical component casing of the present invention, the electro-optical device that modulates the polarized light of the color light from the color light separation optical system in accordance with predetermined information on the lid-like member provided with the fixing portion for the projection lens. And the color light combining optical system that combines the plurality of modulated color lights, and the electro-optical device and the color light combining optical system are fixed to the same member as the projection lens. When this is done, there is no risk of misalignment among the electro-optical device, the color light combining optical system, and the projection lens, and the image quality is maintained satisfactorily.
In the optical component casing according to the present invention, the fixing portion for the projection lens is provided on the lid-like member, and the color light separation optical system is provided on the box-like member, so that the periphery of the box-like member is formed. The optical parts of the color light separation optical system can be supported by using the rising portion, and the support structure is simplified.
In particular, in the case where the member on which the fixing portion is provided is made of metal, the lid member is made of metal in the present invention. This means that the box-like member having a larger surface area is made of metal. That is, the weight can be reduced as compared with the case, and the weight can be sufficiently reduced while reliably supporting a heavy projection lens.
Furthermore, since the optical components constituting the color light separation optical system are fixed to the box-shaped member by the drop-off prevention member, there is no fear that the optical components of the color light separation optical system come off from the box-shaped member and fall off. The handling of the box-shaped member becomes easy. That is, while fixing the projection lens to the lid-like member in advance, if the lid-like member is laid flat and the box-like member is held and attached to the lid member, the projection lens is fixed. It is not necessary to carry out the mounting work with a heavy lid-like member, and even during the mounting work carried out while holding the box-shaped member, it is possible to prevent the optical components of the color light separation optical system from falling off. It is done easily and quickly.
[0008]
In the optical component casing according to the present invention, the projection lens fixing portion may be provided before the projection lens fixing portion is provided.CoverSectionMaterialDesirably made of metal
[0009]
In such a case, the projection lens, which is heavier than other components, is reliably supported.
[0010]
Here, as the metal material, magnesium which is light in weight for the wall thickness can be applied.
[0018]
On the other hand, the projection display device of the present invention includes any of the optical component casings described above, and as described above, the projection display device is promoted to be smaller and lighter. Can achieve the purpose.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0020]
(1) Overall configuration of the device
FIG. 1 shows a schematic perspective view of a projection display device 1 according to this embodiment. The projection display apparatus 1 separates a light beam emitted from a light source lamp into three primary colors of red (R), green (G), and blue (B) by a color light separation optical system, and separates these color light beams into an electro-optical device. Modulation is performed in accordance with image information through a liquid crystal panel, and modulated light beams of each color after being modulated are combined by a prism (color light combining optical system) and displayed on a projection surface through a projection lens 6 in an enlarged manner. Is. Each component is housed in the outer case 2.
[0021]
(2) Exterior case structure
The outer case 2 is basically composed of an upper case 3 that covers the upper surface of the device, a lower case 4 that forms the bottom surface of the device, and a rear case (not shown) that covers the back surface. The upper case 3 and the lower case 4 is a magnesium die-cast and the rear case is a resin.
[0022]
An air intake port 240 is provided at a substantially central right side (right side when viewed from the front) of the upper surface of the upper case 3, and the air intake port 240 is covered with a resin filter exchange lid 241. The filter replacement lid 241 is formed with a slit-shaped opening 241A for introducing air taken from the outside into the apparatus as cooling air. Inside the filter replacement lid 241 is an air filter (not shown). Is provided. The internal air filter can be exchanged by attaching / detaching the filter exchange lid 241 from the upper surface side of the upper case 3.
[0023]
Each upper portion of the front surface of the upper case 3 and the lower case 4 is provided with a notch opening that is continuous in the vertical direction, and a large opening formed by each notch opening serves as an exhaust port 160 that exhausts air inside the apparatus. ing.
[0024]
An AC inlet for supplying external power and various input / output terminal groups (not shown) are arranged on the side surface and the back surface of the exterior case 2 near the air intake port 240.
[0025]
(3) Internal structure of the device
2 to 4 show the internal structure of the projection display device 1.
[0026]
As shown in these drawings, inside the apparatus 1, a light source lamp unit 8 disposed at one side of the projection lens 6 with a space therebetween, and disposed between the projection lens 6 and the light source lamp unit 8. In addition to the optical unit 10 constituting the optical system, the driver board (not shown) for driving the electro-optical device 925 (FIG. 4) of the optical unit 10, the main board (not shown) for controlling the entire device 1, the AC inlet The power from the light source lamp unit 8, the driver board, the main board, the cooling fan 17 disposed above the electro-optical device 925, the front of the light source lamp unit 8 (the rear in the direction of the flow of the cooling air) ) Is provided with a power supply unit (not shown) for supplying to an exhaust fan (not shown) or the like. The power supply unit may be divided into a plurality of parts in consideration of the arrangement space in the device 1.
[0027]
The light source lamp unit 8 constitutes a light source portion of the projection display device 1, and as shown in FIG. 5, a light source 183 including a light source lamp 181 and a concave mirror 182, and a lamp housing that houses the light source 183. (Not shown). Such a light source lamp unit 8 is cooled by the cooling air from the cooling fan 17 described above or the cooling air sucked from the gap between the exterior case 2 and the projection lens 6. The cooling air first cools the electro-optical device 925 and the like immediately after being sucked, and then flows to the left side so as to cool substantially the entire area inside the device 1, and finally most of the light source lamp unit. 8 is exhausted from an exhaust port 160 on the front surface by an exhaust fan (not shown). Therefore, since the light source lamp unit 8 is disposed immediately before the exhaust fan, it is possible to efficiently cool the light source 183 therein with a large amount of cooling air.
[0028]
The optical unit 10 is a unit that optically processes the light beam emitted from the light source lamp unit 8 to form an optical image corresponding to the image information, and includes a light guide 900 as a housing for optical components. . The light guide 900 includes an upper light guide 901 made of resin and having a box shape, and a lower light guide 902 made of magnesium and having a lid shape. The projection lens 6 is fixed to the lower light guide 902. A vertical head plate 903 as a fixed portion is integrally provided.
[0029]
Although not shown, the driver board for driving and controlling the electro-optical device 925 is disposed above the optical unit 10 and controls the entire projection display device 1 behind the optical unit 10. A main board on which a control circuit is formed is arranged upright. Therefore, the main board and the driver board are arranged at right angles to each other and are electrically connected. In addition, the AV board provided with the above-described input terminal group is arranged upright like the main board and is electrically connected to the main board.
[0030]
(4) Structure of optical system
Next, the optical unit 10 will be described in detail with reference to FIGS.
[0031]
The optical unit 10 includes an illumination optical system 923, a color light separation optical system 924, a relay optical system 927, an electro-optical device 925 fixed to the lower light guide 902, respectively, A cross dichroic prism 910 as a light combining optical system and a projection lens 6 fixed to the head plate 903 of the lower light guide 902 are configured.
[0032]
The illumination optical system 923 is an integrator illumination optical system for almost uniformly illuminating the image forming areas of the three liquid crystal panels 925R, 925G, and 925B of the electro-optical device 925. The illumination optical system 923 includes a light source 183 and a first lens array 921. A second lens array 922, a reflection mirror 931, and a superimposing lens 932. The lens arrays 921, 922, the superimposing lens 932, and the reflection mirror 931 are arranged in a state of being supported by the rising portion of the upper light guide 901, and are fixed by a clip 7 as a drop-off preventing member. Even if the light guide 901 is reversed from the state shown in FIG. 3, it does not fall off.
[0033]
A light source 183 constituting the illumination optical system 923 includes a light source lamp 181 as a radiation light source that emits a radial light beam, and a concave mirror 182 that emits the radiation light emitted from the light source lamp 181 as a substantially parallel light beam. As the light source lamp 181, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is often used. As the concave mirror 182, it is preferable to use a parabolic mirror or an elliptical mirror.
[0034]
The first lens array 921 has a configuration in which small lenses 9211 having a substantially rectangular outline are arranged in a matrix of M rows and N columns. Each small lens 9211 splits a parallel light beam incident from the light source into a plurality of (that is, M × N) partial light beams, and forms each partial light beam in the vicinity of the second lens array 922. The contour shape of each small lens 9211 is set so as to be almost similar to the shape of the image forming area of the liquid crystal panels 925R, 925G, and 925B. For example, if the aspect ratio (ratio of horizontal and vertical dimensions) of the image forming area of the liquid crystal panel is 4: 3, the aspect ratio of each small lens is also set to 4: 3.
[0035]
The second lens array 922 also has a configuration in which the small lenses 9221 are arranged in a matrix of M rows and N columns so as to correspond to the small lenses 9211 of the first lens array 921. The second lens array 922 has a function of aligning so that the central axes (principal rays) of the partial light beams emitted from the first lens array 921 are perpendicularly incident on the incident surface of the superimposing lens 932. Here, the superimposing lens 932 has a function of superimposing a plurality of partial light beams on the three liquid crystal panels 925R, 925G, and 925B. Further, as shown in FIG. 5, the second lens array 922 is disposed with an inclination of 90 degrees with respect to the first lens array 921 with the reflection mirror 931 interposed therebetween.
[0036]
The reflection mirror 931 is a mirror for guiding the light beam emitted from the first lens array 921 to the second lens array 922, and is not necessarily required depending on the configuration of the illumination optical system. For example, it is not necessary if the first lens array 921 and the light source are provided in parallel to the second lens array 922.
[0037]
The color light separation optical system 924 includes two dichroic mirrors 941 and 942 as an optical component according to the present invention, and a reflection mirror 943, and converts the light emitted from the superimposing lens 932 of the illumination optical system 923 into red and green. , And has a function of separating into three color lights of blue. Each mirror 941, 942, 93 is supported by the rising portion of the upper light guide 901 as described above, and is fixed to the upper light guide 901 by the clip 7.
[0038]
The relay optical system 927 includes an incident side lens 954, a relay lens 973, and reflection mirrors 971 and 972, and these reflection mirrors 971 and 972 are also fixed to the upper light guide 901 by the clip 7.
[0039]
The liquid crystal panels 925R, 925G, and 925B of the electro-optical device 925 are, for example, those using polysilicon TFTs as switching elements. Each of the liquid crystal panels 925R, 925G, and 925B is disposed outside the upper light guide 901 and corresponding to the concave portion 904 (FIG. 3) provided on the outer periphery of the upper light guide 901, and the cross dichroic prism 910 It is screwed onto the lower light guide 902 in a state facing the three side surfaces. Incident-side polarizing plates 960R, 960G, and 960B are arranged on the light incident / exit surface side of the liquid crystal panels 925R, 925G, and 925B, and outgoing-side polarizing plates 961R, 961G, and 961B are arranged on the light-emitting surface side.
[0040]
The cross dichroic prism 910 has a function of combining three color lights to form a color image, and is fixed to the upper surface of the lower light guide 902 with fixing screws. In the cross dichroic prism 910, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interfaces of four right-angle prisms. Three color lights are synthesized by the body multilayer film.
[0041]
The projection lens 6 is the heaviest optical component in the projection display device 1 and is fixed to the head plate 903 of the lower light guide 902 with a bolt or the like via a flange 62 provided on the base end side thereof. .
[0042]
The optical unit 10 configured as described above is assembled as follows.
[0043]
First, a box-shaped upper light guide 901 is placed with its opening side facing upward, and each optical component that constitutes an illumination optical system 923, a color light separation optical system 924, a relay optical system 927, and the like in the upper light guide 901. Components (reflection mirror, various lenses, etc.) are arranged, and these optical components are fixed to the upper light guide 901 with the clip 7.
[0044]
On the other hand, in the lid-shaped lower light guide 902, a cross dichroic prism 910 having liquid crystal panels 925R, 925G, and 925B fixed thereto is fixed to the upper surface thereof, and the projection lens 6 is fixed to the head plate 903. Then, the lower light guide 902 is fixed to the lower case 4. Note that after the lower light guide 902 alone is screwed to the lower case 4 first, the liquid crystal panels 925R, 925G, and 925B and the cross dichroic prism 910 may be mounted, or the projection lens 6 may be fixed.
[0045]
Next, the upper light guide 901 on which each optical component is mounted is reversed and attached so as to cover the lower light guide 902, and the upper light guide 901 is also fixed to the lower case 4 in this state.
[0046]
In this embodiment, the cross dichroic prism 910 and the projection lens 6 are fixed to the lower light guide 902 and the upper and lower light guides 901 and 902 are fixed to the lower case 4 by screws. The fixing may be performed by other appropriate fixing methods such as bonding or fitting.
[0047]
(5) Optical system functions
In the optical unit 10 shown in FIG. 5, the substantially parallel light beams emitted from the light source 183 are converted into a plurality of partial light beams by the first and second lens arrays 921 and 922 constituting the integrator optical system (illumination optical system 923). Is divided into The partial light beams emitted from the small lenses 9211 of the first lens array 921 are substantially superimposed on the image forming regions of the liquid crystal panels 925R, 925G, and 925B by the superimposing lens 932. As a result, each of the liquid crystal panels 925R, 925G, and 925B is illuminated with illumination light having a substantially uniform in-plane distribution.
[0048]
At this time, the first dichroic mirror 941 of the color light separation optical system 924 reflects the red light component of the light beam emitted from the illumination optical system 923 and transmits the blue light component and the green light component. The red light reflected by the first dichroic mirror 941 is reflected by the reflection mirror 943, passes through the field lens 951, and reaches the red liquid crystal panel 925R. The field lens 951 converts each partial light beam emitted from the second lens array 922 into a light beam parallel to the central axis (principal ray). The same applies to the field lenses 952 and 953 provided in front of the other liquid crystal panels 925G and 925B.
[0049]
Of the blue light and green light transmitted through the first dichroic mirror 941, the green light is reflected by the second dichroic mirror 942, passes through the field lens 952, and reaches the green liquid crystal panel 925G. On the other hand, the blue light passes through the second dichroic mirror 942, passes through the relay optical system 927, and further passes through the field lens 953 to reach the blue light liquid crystal panel 925B. The reason why the relay optical system 927 is used for blue light is that the length of the optical path of blue light is longer than the length of the optical path of other color lights, thereby preventing a decrease in light use efficiency due to light diffusion or the like. It is to do. That is, this is to transmit the partial light beam incident on the incident side lens 954 to the field lens 953 as it is.
[0050]
The red, green, and blue color lights are incident on the liquid crystal panels 925R, 925G, and 925B, and are made to have only specific polarized light by the incident side polarizing plates 960R, 960G, and 960B. Thereafter, each polarized light is modulated in accordance with image information given in each liquid crystal panel 925R, 925G, and 925B, and is emitted to the output side polarizing plates 961R, 961G, and 961B as modulated light. In the exit-side polarizing plates 961R, 961G, and 961B, only specific polarized light of the modulated light is transmitted and emitted to the cross dichroic prism 910. The emitted polarized light of each color light is synthesized by the cross dichroic prism 910 to become synthesized light, and is emitted in the direction of the projection lens 6. The synthesized light is projected as a color image by the projection lens 6 onto a projection surface such as a projection screen.
[0051]
(6) Effects of the embodiment
According to this embodiment, there are the following effects.
[0052]
That is, the lid-shaped lower light guide 902 constituting the light guide 900 is integrally provided with a head plate 903 for fixing the projection lens 6, so that the projection lens 6 can be directly fixed to the light guide 900. . Therefore, the support member used conventionally can be made unnecessary, and the size reduction and weight reduction of the apparatus 1 can be promoted accordingly.
[0053]
Further, since the lower light guide 902 provided with the head plate 903 is made of metal made of magnesium, the projection lens 6 that is heavier than other components can be reliably supported.
[0054]
The lower light guide 902 is made of metal, but the upper light guide 901 having a larger surface area is made of resin, so that the weight of the entire light guide 900 is not so large and can be sufficiently reduced in weight.
[0055]
The projection lens 6, the liquid crystal panels 925R, 925G, and 925B that modulate the polarized light of the color light from the color light separation optical system 924 according to predetermined information, and the cross dichroic prism 910 that combines the plurality of modulated color lights are the same. Since it is fixed to the light guide 902, when the upper light guide 901 is put on and joined to the lower light guide 902, the liquid crystal panels 925R, 925G, 925B, the cross dichroic prism 910, and the projection lens 6 are displaced from each other. There is no risk of it occurring, and the image quality can be maintained satisfactorily.
[0056]
Since the optical components constituting the illumination optical system 923, the color light separation optical system 924, and the relay optical system 927 are provided in the box-shaped upper light guide 901, each optical component is disposed around the upper light guide 901. It is possible to support by using the rising portion, simplify the support structure, and effectively prevent displacement of each optical component. At this time, since each optical component is fixed to the upper light guide 901 by the clip 7, there is no fear that the optical component is detached from the upper light guide 901 and falls off, and the handling of the upper light guide 901 can be facilitated. That is, the projection lens 6 is fixed to the lower light guide 902 in advance, and the projection lens 6 is fixed if the upper light guide 901 on which each optical component is mounted is attached to the lower light guide 902. It is not necessary to carry out the installation work with the lower light guide 902 that becomes heavy due to this, and even during the installation work carried out while holding the upper light guide 901, the optical components can be prevented from falling off, so the installation work can be done easily and quickly. Yes.
[0057]
(7) Modification of the embodiment
In addition, this invention is not limited to the said embodiment, Other structures etc. which can achieve the objective of this invention are included, The deformation | transformation etc. which are shown below are also contained in this invention.
[0058]
For example, in the above embodiment, the head plate 903 for fixing the projection lens 6 is provided in the lower light guide 902. However, the present invention includes the case where such a head plate is provided in the upper light guide.
[0059]
Further, the lower light guide may be provided in a box shape and the upper light guide may be provided in a lid shape. In such a case, in addition to the projection lens, the electro-optical device, and the color light combining optical system, the illumination optical system and the color light separation are provided. It is desirable to attach an optical system, a relay optical system, etc. to the lower light guide.
[0060]
In short, in the present invention, the projection lens only needs to be directly fixed to the lid-like member or box-like member of the optical component casing such as the light guide 900, and the projection lens and other optical systems are connected to the lid-like member and Which of the box-like members is fixed may be arbitrarily determined in consideration of workability and the like.
[0061]
The drop-off preventing member according to the present invention is not limited to the clip 7, and any shape, structure, or the like can be used as long as it is a member that can prevent the drop-out of the optical component.
[0062]
Furthermore, in the above-described embodiment, the electro-optical device 925 is configured by the three liquid crystal panels 925R, 925G, and 925B. The present invention may be adopted.
[0063]
In the embodiment, the panel constituting the electro-optical device 925 is composed of a liquid crystal element. However, the projection type includes a light modulation device composed of a plasma element other than liquid crystal and a device panel using a micromirror. You may employ | adopt this invention to a display apparatus.
[0064]
In addition, the electro-optical device 925 in the above embodiment is of a type that transmits and modulates the light beams R, G, and B, but is not limited thereto, and is a reflection that modulates and emits while reflecting incident light. The present invention may be applied to a projection display device having a type of light modulation device.
[0065]
【The invention's effect】
As described above, according to the present invention, since the fixing member for the projection lens is provided on the box-shaped member or the lid-shaped member constituting the optical component casing, the projection lens is attached to the optical component casing. Can be fixed directly to the body. Therefore, the conventionally used support member can be eliminated, and the apparatus can be reduced in size and weight accordingly.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a projection display apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an internal structure of the projection display device in the embodiment.
FIG. 3 is a perspective view showing an internal structure of the projection display device in the embodiment.
FIG. 4 is a perspective view showing an internal structure of the projection display device in the embodiment.
FIG. 5 is a schematic diagram for explaining the structure of an optical system in the embodiment.
[Explanation of symbols]
1 Projection display
6 Projection lens
7 Clips that prevent falling off
900 Light guide as a housing for optical components
901 Upper light guide which is a box-shaped member
902 Lower light guide as a lid-shaped member
903 Head plate which is a fixed part
910 Cross dichroic prism, a color light combining optical system
924 Color separation optical system
925 electro-optical device
925R LCD panel
925G LCD panel
925B LCD panel

Claims (3)

And box-like member, the box-shaped member is generally composed of a lid-like member for closing the opening portion of, and an optical component casing that at least the color light separation optical system therein is housed, pre Kifuta shaped member , said has fixing portions integrally provided for the projection lens that projects the color light from the color separation optical system, the box-like member is attached the color light separation optical system, for the projection lens The lid-like member provided with the fixed portion includes an electro-optical device that modulates polarized light of the color light from the color light separation optical system according to predetermined information, and a color light combining optical system that combines the plurality of modulated color lights And an optical component constituting the color light separating optical system is fixed to the box-shaped member by a drop-off preventing member . In the optical component casing according to claim 1, wherein the lid-like member which fixing portion is provided for the projection lens, the optical component casing, characterized in that it is made of metal. Projection display apparatus characterized by comprising an optical component casing according to claim 1 or 2.

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