JP3646728B2 - LCD projector - Google Patents

Description

  The present invention relates to a front-type and rear-type liquid crystal projector using a liquid crystal panel, and more particularly to an adjustment mechanism for the liquid crystal panel.

Conventionally, as a mounting structure of a liquid crystal panel, for example, Japanese Patent Application Laid-Open No. 63-10128 (Patent Document 1) and Japanese Patent Application No. 4-270557 (Patent Document 2) directly fix a liquid crystal panel to a light combining prism. It is disclosed. In these publications, pixel alignment adjustment (hereinafter referred to as alignment adjustment) of a plurality of liquid crystal panels (also referred to as light valves) that modulate light separated into red, green, and blue and within the allowable depth of focus of the projection lens. By eliminating the mechanism for adjusting the arrangement of each liquid crystal layer surface (hereinafter referred to as focus adjustment), the image-forming optical system is reduced in size and weight, reducing costs by reducing parts and reducing assembly adjustment work. It has been shown.
Japanese Patent Laid-Open No. 63-10128 Japanese Patent Application No. 4-270557

  However, what is proposed in these publications is that the liquid crystal panel is firmly fixed to the photosynthetic prism, and when repair / regeneration occurs, the removal thereof is very troublesome. Repairs that occur after shipment from the factory to the market are few, but in the factory before shipment, the necessity for repair / regeneration often occurred due to the following reasons.

1) Pattern break due to chipping, circuit element destruction due to static electricity entering from electrode terminals, replacement / regeneration with non-defective products due to dirt attached to hand oil or adhesive, etc. by handling between processes of the liquid crystal panel.
2) At the initial stage of mass production of liquid crystal panels, each manufacturing process is not stable, and a complaint is suddenly generated. In such a case, replacement / regeneration with a good product is possible.

  In addition, it is indispensable to reduce the blurring of the screen and prevent color misregistration to suppress the alignment adjustment accuracy to 1/2 pixel or less between pixels. Considering the amount of chromatic aberration of magnification of the projection lens and the amount of accuracy deviation of the composite surface of the light combining prism, it is necessary to increase the adjustment accuracy within a few microns. Further, the focus adjustment accuracy varies depending on the setting of the allowable confusion circle value and the F value of the projected image, but the allowable focal depth is about 100 μm, and adjustment within this range is necessary. For this reason, an expensive adjusting machine that can be adjusted in the six-axis direction is required. Furthermore, it is impossible in reality to place these expensive adjusting machines at all bases where after-sales service is performed, and it is necessary to return to a limited base or manufacturing factory to repair and regenerate. For this reason, the following problems are pointed out.

1) If a quick after-sales service is hindered or if the unit of the imaging optical system is replaced, the customer will be required to pay a very high cost.
2) Even when repairs and remanufacturing are carried out in the manufacturing plant, the operation rate of mass production is lowered, leading to an increase in cost.

  Furthermore, the liquid crystal panel and photosynthetic prism are expensive parts. If you use three liquid crystal panels for red, blue, and green, and use a high-definition one that supports 640 x 480 dot arrangement, the cost of the parts will be reduced. Since it accounts for 20% to 40%, discarding it as a defective product is very wasteful and increases costs.

An object of the present invention is to provide a liquid crystal projector that has a simple structure, reduces the number of parts, and reduces the man-hours for assembly and adjustment.
Another object of the present invention is to provide a liquid crystal projector that facilitates replacement of a liquid crystal panel after manufacture.
Another object of the present invention is to provide a liquid crystal projector that facilitates assembling and adjusting operations to obtain high-quality images.
Still another object of the present invention is to provide a liquid crystal projector that realizes a compact optical system and is excellent in size and weight reduction.

The liquid crystal projector according to the present invention is a liquid crystal projector having an image forming optical system including a projection lens and light combining means, at least one liquid crystal panel disposed at a subject position of the image forming optical system, and the light combining means. disposed opposite to the incident surface, wherein the support frame for supporting the side surface of the outer edge of the liquid crystal panel, interposed between the side surface of the outer edge of the supporting frame and the liquid crystal panel, and positioning the liquid crystal panel A spacer member for fixing a side surface of the outer edge portion of the liquid crystal panel to the support frame with a photocurable adhesive, and fixing the liquid crystal panel to the support frame via the spacer member, The projection lens is fixed to the support frame.

In the liquid crystal projector according to the present invention, the support frame also serves as an optical system housing including a light separation system in the liquid crystal projector described above.
In the liquid crystal projector according to the present invention, the light combining means is a cross dichroic mirror in the above liquid crystal projector.

Since the present invention is configured as described above, it has the following advantages.
1) Since the mechanism for alignment adjustment and focus adjustment is omitted, the optical system becomes smaller and lighter by that amount, and a small liquid crystal projector can be realized. When the liquid crystal panel is miniaturized taking advantage of the polysilicon TFT, if the optical system is to be miniaturized accordingly, the adjustment mechanism is the main factor that hinders miniaturization, According to the present invention, since the adjustment mechanism can be omitted, the apparatus can be reduced in size.
2) Further, the flow space of the cooling air can be increased by utilizing the space of the portion where the adjusting mechanism is omitted. Furthermore, since the frame and the like form a reliable flow path, the cooling efficiency can be improved, and even a small fan can be cooled. From these points, it is advantageous for downsizing.

  3) By fixing the liquid crystal panel to a light combining means, for example, a light combining prism, it is possible to prevent positional deviation between the liquid crystal panels. Accordingly, it is possible to improve reliability such as disturbance resistance, temperature change resistance, and handling resistance. In addition, even when bonding and fixing by combining members having different thermal expansion coefficients, it is possible to prevent deviation, cracking, etc. due to changes in temperature resistance by setting the optimum adhesive, bonding conditions and glass transition point for the operating temperature range. . Therefore, pixel shift can be suppressed, and higher definition products can be handled.

4) In addition to the reduction in parts and assembly costs associated with the omission of the adjustment mechanism, it is possible to downsize expensive optical components, which can greatly contribute to cost reduction.
5) In particular, since the back focus amount of the projection lens can be reduced, a reasonable lens design can be achieved, and the cost performance can be further increased by increasing the F value and increasing the amount of projection light.
6) In addition, if a defect occurs in the liquid crystal panel in the factory or in the market, replace it with a non-defective liquid crystal panel without using a dedicated alignment adjuster. Can be played. Therefore, it is possible to reduce expensive after-sales service costs, repair in a short time, and improve the operating rate and reduce the defective rate in mass production of dedicated alignment adjusters in the factory.

7) Further, there is an advantage that focus adjustment can be omitted. In the design of a projection lens mainly composed of telecentric incident light, when the screen size of the liquid crystal panel does not change, it is more effective to use the fact that the focus deviation can be relatively large and practically acceptable.
8) In addition, since the liquid crystal panel is protected by a shield case and holding member, chipping, cracking, electrostatic breakdown, dirt, etc. that occur during handling can be prevented, so that the yield is improved and after-sales service is improved. Can do.

9) In addition, since an optical unit in which a projection lens, a light combining prism, a liquid crystal panel, and the like are integrated with the support frame can be formed, handling and assembly are improved. In addition, an adjustment master lens is not required, and a low adjustment man-hour is achieved. At the same time, adverse effects due to deviations in the characteristics of the projection lens can be prevented. Furthermore, it has applicability to replace the cross dichroic mirror system.
10) Further, it is possible to replace the support frame with an optical system housing and integrate them.
11) Further, a cooling ventilation path in the same direction is formed between the three liquid crystal panels and the incident surface of the prism constituting the light combining means, so that the cooling effect can be enhanced.

  FIG. 1 is a plan view showing a configuration of an optical unit of a liquid crystal projector according to an embodiment of the present invention. In the figure, liquid crystal panels 1a, 1b and 1c control light (2a, 2b and 2c) obtained by separating light from a light source (not shown) into red, green and blue light by a separating optical system (not shown). Modulation is based on the video signal (not shown). Polarizing plates 3 are respectively arranged on the emission sides of the liquid crystal panels 1a, 1b, and 1c, and are fixed to the panel glasses of the liquid crystal panels 1a, 1b, and 1c, respectively. The mounting member 4 is configured by a prismatic shape made of glass material, ceramic material, resin material or the like, and one side surface of the prismatic shape is bonded and fixed to both side portions of the liquid crystal panels 1a, 1b, and 1c, An inclined portion 4a is formed on the other side surface. The spacer members (plural) 5 are made of a wedge-shaped glass material and are disposed below the inclined portion 4a. The light combining prism 6 includes a dichroic layer, and its light incident surface is arranged to face the liquid crystal panels 1a, 1b, 1c, and the image light modulated by the liquid crystal panels 1a, 1b, 1c The images are synthesized by the dichroic layer and projected onto a screen (not shown) by the projection lens 7.

  One side surface of the mounting member 4 is bonded and fixed to the panel glass surfaces of the liquid crystal panels 1a, 1b, and 1c. At that time, the mounting member 4 does not cover or abut the polarizing plate 3 on the emission side. Adhering and fixing to the outside of the polarizing plate 3 as shown in the figure. In addition, the spacer member 5 is inserted into a gap of a triangular section formed by the inclined portion 4a of the mounting member 4 and the light incident surface of the light combining prism 6, and the mutual adhesion is formed by the adhesive layer formed in the minimum gap. The

  Next, an assembly and alignment adjustment method will be described. The attachment member 4 is fixed to each of the liquid crystal panels 1a, 1b, and 1c by visible light and fixed by a photo-curing type adhesive that is softened by heating to form a liquid crystal panel unit. Then, the liquid crystal panel unit is hatched by the alignment adjuster and brought to the position of the light incident surface of the light combining prism 6. Position adjustment in the X / Y axis direction perpendicular to the optical axis of the projection lens 7, position adjustment in the rotation direction of Xθ / Yθ around the X / Y axis, and a liquid crystal surface in the focal plane of the projection lens 7 Each position adjustment is performed so that.

  Next, spacer members (plurality) 5 coated with a photo-curable adhesive are inserted into a gap of a triangular cross section formed by the light incident surface of the light combining prism 6 and the inclined portion 4a of the mounting member 4, and ultraviolet light or the like is inserted. The adhesive is cured by irradiating the light and fixed.

  Next, focusing is performed on the liquid crystal panels 1a and 1c in the same manner as described above. Further, with respect to the liquid crystal panel 1b, the in-plane formed by the X / Y axis direction and the XY axis so that the pixels are aligned with each other Rotation adjustment is performed with an alignment adjuster. After positioning, the wedge 5 coated with a photo-curable adhesive is inserted into the gap of the triangular section formed by the inclined portion 4a of the mounting member 4 and the light incident surface of the light combining prism 6 in the same manner as described above. Then, a prism unit is formed by irradiating light such as ultraviolet rays to be cured and bonded.

  FIG. 2 is a block diagram showing a configuration of a control device for performing the above assembling work and alignment adjusting work. In the figure, a personal computer 100 is connected with a CRT 101 and a storage device 102, and the personal computer 100 drives a drive circuit 104 via a control device 103. The drive circuit 104 controls the 6-axis manipulator 105 to perform focus adjustment and alignment adjustment for the liquid crystal panels 1b, 1a, and 1c in FIG. When the adjustment is completed, the drive circuit 104 drives the ultraviolet device 107 to irradiate light such as ultraviolet rays to cure the adhesive and fix the attachment member 4 to the light combining prism 6. In this adjustment, the image from the projection lens 7 of the optical unit 106 is directly or directly projected on the screen by the CCD camera 108 and the imaged signal is displayed on the CRT 110 via the video circuit 109.

  FIGS. 3A and 3B are explanatory diagrams of images displayed on the CRT 110 at the time of this alignment. FIG. 3A shows the pattern 112 of each pixel of the liquid crystal panels 1a, 1b, and 1c displayed as it is. FIG. 3B shows the test pattern 113 displayed on the liquid crystal panels 1a, 1b, and 1c. While adjusting the display pattern, the personal computer 100 is operated to control the 6-axis manipulator 105, and the above adjustment is performed.

  Next, another configuration example of the holding member 4 in FIG. 1 will be described. 4A to 4C are explanatory views showing other examples of the structure of the attachment member 4 of FIG. In the example of FIG. 4A, the spacer member 5 is disposed between the liquid crystal panel 1 b and the attachment member 4. Most of the gaps in the cross-sectional triangle formed between the inclined portion 4a formed on the other side surface of the mounting member 4 and the liquid crystal panel 1b are not constant. Therefore, when divided into 2 to 3 in the vertical direction, it is easy to secure a bonding area in conformity with the shape of each insertion portion, the amount of protrusion to the outside can be suppressed, and interference with adjacent members is prevented.

  In the example of FIG. 4B, the mounting member 4 is formed integrally with the light combining prism 6 to enable rationalization of the assembly work. Further, in the example of FIG. 4C, adjacent mounting members 4 are integrated, and this mounting member 4 is adhered and fixed to the corner of the light combining prism 6 as shown in the figure.

  By the way, after the optical unit 106 is manufactured, if the liquid crystal panel becomes defective or if a defective product is mixed, the bonded portion between the liquid crystal panels 1a, 1b, 1c and the mounting member 4 is attached to the dryer, laser, or the like. Heat with light. Then, the adhesive is softened by heating, and the liquid crystal panels 1a, 1b, 1c can be peeled off with a slight force. At this time, since the mounting member 4 remains fixed to the light combining prism 6, a non-defective liquid crystal panel unit can be bonded and fixed to one side surface of the mounting member 4 and replaced again. Furthermore, in this case, since the mutual positional relationship in the focal direction is not changed, the focus adjustment work can be omitted.

  FIG. 5 is a plan view showing a configuration of a part of an optical unit of a liquid crystal projector according to another embodiment of the present invention, and FIG. 6 is an enlarged front view thereof. Here, parts different from the embodiment of FIG. 1 will be described. A frame 8 corresponding to the mounting member 4 in FIG. 1 is made of a resin material (PPS / reinforced polycarbonate material or the like) having a high heat resistance and a small expansion coefficient, and holds and fixes a holding member 9 made of metal. L-shaped positioning portions 8a protruding at the four corners are provided on the front side of the frame body 8, and inclined portions 8b that engage with the wedges 5 are provided on the back side.

  A rectangular window hole 9a is opened at the center of the holding member 9, and an adhesive that is cured by visible light is applied to the periphery of the window hole 9a, and the liquid crystal panel 1b is attached and cured and fixed by light irradiation. I am letting. The non-light-incident portion of the liquid crystal panel 1b is shielded by the frame portion around the window hole 9a. A flexible printed circuit board (FPC) 10 is fixed to the liquid crystal panel 1b by an anisotropic conductive film (ACF) 11 so as to be conductive, and is drawn out from a recess of the frame body 8. Further, the holding member 9 is provided with an elastic portion 9b formed so as to protrude from each side of the rectangular frame of the main body and expand in a T shape, and the elastic portion 9b is a positioning portion 8a of the frame body 8. Temporarily fixed using elastic force. The holding member 9 is permanently fixed to the frame 8 by an adhesive that softens the square corners of the main body with a visible light curable type, and a liquid crystal panel unit is formed. Similarly, the liquid crystal panels 1a and 1c are attached to the light combining prism 6 to form a liquid crystal panel unit corresponding to the liquid crystal panels. Assembly / alignment adjustment work is performed in the same manner as in FIG. 1 to form a prism unit.

  In addition, the exchange of defective products of the liquid crystal panels 1a, 1b, and 1c that occurs after the prism unit of FIGS. 5 and 6 is formed is performed by heating the bonding portion between the holding member 9 and the frame body 8 in the same manner as in FIG. The holding member 9 is peeled after the adhesive is softened. Then, it can be reassembled into a non-defective liquid crystal panel unit, assembled and adjusted in the same manner as described above, and again bonded and fixed in the same manner for reproduction. At this time, if the accuracy of the liquid crystal surface position of the liquid crystal panel unit is within an allowable value, the focus adjustment work can be omitted. However, if the alignment adjustment work can be performed manually without using a dedicated alignment adjuster, the workability is further improved.

  FIGS. 7A and 7B are partial cross-sectional views of the embodiment of FIGS. In FIG. 7A, a partial bent portion 9c (plurality) is provided on the outer peripheral portion of the main body of the holding member 9 and used for preventing the adhesive from flowing in the liquid crystal panel 1b. Providing the bent portion 9c is effective for enhancing the fixing force to the liquid crystal panel 1b when the fluidity of the adhesive is high.

  In FIG. 7B, the head slope of the countersunk screw 12 is engaged with the outer peripheral part of the main body of the holding member 9, and the rotation is adjusted in the plane including the X and Y axis directions and the XY axis by screwing up and down. . An adhesive is applied to the threaded portion of the countersunk screw 12, and this adhesive is cured in close contact with the mating member by a screw tightening pressure, and an anaerobic curing type is used. In addition, a resin film can be formed on the screw surface to loosen and increase torque. The countersunk screw 12 can be supported by the spring force of the elastic portion 9b only by attaching and adjusting the countersunk screw 12 on the side where the position of the liquid crystal panel 1b is displaced.

  7C and 7D are partial cross-sectional views illustrating an application example of FIG. 7B. The example of FIG. 7C is an example using an eccentric cam 13 attached to a dowel so as to have a friction torque instead of the flat head screw of FIG. 7B. The example of FIG. 7D is an example in which the eccentric pin 14 is fitted into the hole instead of the eccentric cam 13. These eccentric cams 13 and eccentric pins 14 are both locked by friction stoppers.

  FIG. 8 is a plan view showing another configuration example of the frame body 8 and the holding member 9 of the embodiment of FIG. A connecting portion 9d (four locations) is formed between the main body portion of the holding member 9 and the elastic portion 9b. The holding member 9 is fixed to the frame body 8 by screws 15 (four). The screw 15 also serves to prevent deformation of the main body due to the reaction force of the elastic portion 9b, such as warping or twisting.

  When the liquid crystal panel needs to be replaced, the screw 15 is removed and the defective liquid crystal panel unit is removed. Then, after the dowel 8b is cut, the holding member 9 to which the non-defective liquid crystal panel is bonded is temporarily fixed by hooking the elastic portion 9b to the positioning portion 8a. After adjusting the alignment using the adjusting members 12, 13, and 14 shown in FIGS. 7 (B) to 7 (D), the screws 15 are permanently fixed.

  Further, a structure for bonding and fixing the liquid crystal panel 1b to the holding member 9 will be described with reference to FIG. FIG. 9 is a front view of the holding member 9. The holding member 9 is set on a jig (not shown), the liquid crystal panel 1b is positioned, and the spindle chucked by vacuum (not shown) is lowered and held. Install on member 9. In this state, a visible light curable adhesive having a relatively high fixing force is applied to the dot 16a between the outer peripheral portion of the liquid crystal panel 1b and the bent portion 9c in the 12:00, 4 o'clock, and 8 o'clock directions. Then, it is cured by irradiation with visible light and fixed. Further, the other portion 16b is reinforced and bonded with a visible light curable adhesive having elasticity like silicon resin. The other portion 16b can be omitted if the point 16a is sufficiently fixed. Moreover, if the missing part of the bending part 9c is supplemented with another member, a further reinforcing effect can be obtained and stabilized.

  FIG. 10 is a plan view showing another configuration example of the frame body 8 and the holding member 9 of the embodiment of FIG. 6, and FIG. 11 is a plan view showing details of the holding member 9. In the present embodiment, an elastic portion for temporarily fixing the frame 8 and the holding member 9 is provided on the frame 8 instead of the holding member 9. The elastic portion 8c, which is provided with elasticity by projecting from the four sides of the main body of the frame 8, abuts against the corner portion of the main body of the holding member 9 to give elasticity and temporarily fix. Then, the protruding piece 9 d of the holding member 9 is permanently fixed by the screw 15. In addition, only the center part which tied a pair of elastic part 8c is connected with the main body of the frame 8, and the other part has floated with respect to the main body of the frame 8. In the present embodiment, an example in which the position is adjusted at three points by the spacer 5 is shown.

  FIG. 12 is a cross-sectional view showing a partial configuration of a liquid crystal panel unit according to another embodiment of the present invention. In the present embodiment, the liquid crystal panel 1b is bonded and fixed to shield cases 17a and 17b made of a conductive member such as metal as in the embodiment of FIG. A square window hole is provided in the central portion of the shield cases 17a and 17b, and the window hole 17c provided in the shield case 17b functions in the same manner as the window hole 9a provided in the holding member 9. The alignment adjustment operation is performed in the same manner as in the embodiment of FIG. 1 to form a prism unit. If the shield case 17b shown in FIG. 12 is replaced with the holding member 9 shown in FIG. 6, both advantages can be utilized.

  FIG. 13 is a cross-sectional view showing a modification of FIG. This embodiment is an example in which the outer shield case 17b is omitted from the pair of shield cases 17a and 17b in FIG.

  In the embodiment of FIGS. 12 and 13, the light incident surface of the light combining prism 6, the mounting member 4, and the polarizing plate 3 form a flow path in the vertical direction (direction perpendicular to the paper surface), and send cooling air from below. Therefore, since there is no obstacle, the incident surface of the photosynthetic prism and the polarizing plate 3 can be effectively cooled.

  FIG. 14 is a plan view showing a partial configuration of an optical unit according to another embodiment of the present invention. In the present embodiment, the light combining prism 6 is positioned and fixed to the support frame 18. The liquid crystal panels 1a, 1b, and 1c are bonded and fixed to the recesses (three places) provided in the support frame 18 with a visible light curable type and an adhesive that is softened by heating. Of course, the alignment adjustment operation is the same as in FIG. The support frame 18 forms an optical unit by fixing the projection lens 7 with screws.

  FIG. 15 is a plan view of an optical unit according to the application example of FIG. In the present embodiment, two dowels 18a are provided in the recess with respect to the support frame 18 of the embodiment of FIG. The liquid crystal panel unit uses a state in which the elastic portion 9b of the holding member 9 in FIG. 5 is deleted. The holes 9e and 9f provided in the holding member 9 are engaged with the dowels 18a so as to have a backlash, thereby enabling alignment adjustment work similar to that of the embodiment of FIG. It is fixed with an adhesive that is softened by heating with a visible light curable mold after adjustment. 14 and 15, the light combining prism 6 can be replaced with a dichroic mirror.

  FIG. 16 is a cross-sectional view of an embodiment in which the light combining prism 6 of FIG. 14 is replaced with a dichroic mirror 20. Further, the support frame 18 can be integrated with a housing of an optical system that supports mirrors for separating lamp light into red, green, and blue and mirrors for reflecting and guiding light. Furthermore, the prism unit of FIGS. 1, 5, 8, and 12 can be housed in the support frame 18 to form an optical unit.

  FIGS. 17A to 17C are plan views showing a partial configuration of an optical unit according to still another embodiment of the present invention. In the embodiment of FIG. 17A, the output side polarizing plate 3 is attached to the light incident surface of the light combining prism 6, and the liquid crystal panel 1 b is disposed in the immediate vicinity of the polarizing plate 3. Then, in the state where the alignment adjustment work is performed and the positioning is completed as in the embodiment of FIG.

  In the embodiment of FIG. 17B, a convex portion 3a having an inclined surface is formed on the output-side polarizing plate 3, and the inclined surface of the convex portion 3a and the inclined surface of the spacer member 5 are engaged with each other to achieve stable adhesion. The power is secured.

  In the embodiment of FIG. 17C, a transparent sheet member 19 is attached to the light incident surface of the light combining prism 6. Moreover, the output side polarizing plate 3 is affixed on the liquid crystal panel 1b. The spacer member 5 is disposed between the transparent sheet member 19 and the output side polarizing plate 3 and is bonded and fixed. In order to replace the defective liquid crystal panel 1, in the embodiment shown in FIGS. 17A and 17B, the output side polarizing plate 3 is peeled off, and in the embodiment shown in FIG. 17C, the transparent sheet member 19 is peeled off. Paste again and play. Of course, the liquid crystal panel 1 can also be replaced by removing the spacer member 5.

  In the above-described embodiment, although not shown in the drawing, a cooling fan is disposed on the lower side in the cross-sectional direction of the light combining prism 6. Cooling air is blown up by this cooling fan, and heat is absorbed from the incident surface of the liquid crystal panel, the exit-side polarizing plate, and the incident-side polarizing plate (not shown). In the present invention, since the mechanism for alignment adjustment and focus adjustment can be omitted, the flow path for the space where the adjustment mechanism becomes unnecessary can be widened. Further, the flow path can be formed in the vertical direction by the mounting member 4, the frame body 8, the support frame 18, and the like.

It is a top view which shows the structure of the optical unit of the liquid crystal projector which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the control apparatus for performing the assembly operation and alignment adjustment operation | work of the optical unit of FIG. It is explanatory drawing of the image | video displayed on CRT when performing alignment adjustment work. It is a fragmentary top view which shows the other structural example of the attachment member of FIG. It is a top view which shows the structure of a part of optical unit of the liquid crystal projector which concerns on other embodiment of this invention. FIG. 6 is an enlarged front view of the optical unit of FIG. 5. (A) And (B) is a fragmentary sectional view of embodiment of FIG.5 and FIG.6, (C) And (D) is sectional drawing which shows the application example of embodiment of (B). It is a front view which shows the other structural example of the frame and holding member of embodiment of FIG. It is a front view which shows the detail of the holding member of FIG. It is a front view which shows the further another structural example of the frame and holding member of embodiment of FIG. It is a front view which shows the detail of the holding member of FIG. It is a top view which shows the structure of a part of optical unit of the liquid crystal projector which concerns on other embodiment of this invention. It is a top view which shows the application example of embodiment of FIG. It is a top view which shows the structure of a part of optical unit of the liquid crystal projector which concerns on other embodiment of this invention. It is a top view which shows the structure of a part of optical unit of the liquid crystal projector which concerns on other embodiment of this invention. It is a top view which shows the structure of a part of optical unit of the liquid crystal projector which concerns on other embodiment of this invention. It is a top view which shows the structure of a part of optical unit of the liquid crystal projector which concerns on other embodiment of this invention.

Claims (3)

In a liquid crystal projector having an imaging optical system provided with a projection lens and light combining means,
At least one liquid crystal panel disposed at a subject position of the imaging optical system;
A support frame disposed opposite to the incident surface of the light combining means and supporting an outer edge of the liquid crystal panel from a side surface ;
To interpose between the support frame and the side surface of the outer edge portion of the liquid crystal panel, adjust the position of the liquid crystal panel, and fix the side surface of the outer edge portion of the liquid crystal panel to the support frame with a photocurable adhesive A spacer member,
Fixing the liquid crystal panel to the support frame via the spacer member;
The projection lens is a liquid crystal projector fixed to the support frame.   The liquid crystal projector according to claim 1, wherein the support frame also serves as a housing of an optical system including a light separation system. 3. A liquid crystal projector according to claim 1, wherein the light combining means is a cross dichroic mirror.

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