JP3303872B2 - Optical unit assembling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front type or rear type liquid crystal projector using a liquid crystal panel, and more particularly to a method of assembling an optical unit thereof.

[0002]

2. Description of the Related Art Conventionally, as a structure for mounting a liquid crystal panel,
For example, JP-A-63-10128 and Japanese Patent Application No. 4-27.
Japanese Patent Laid-Open No. 0557 discloses a liquid crystal panel directly fixed to a photosynthetic prism. In these publications, in particular, mutual pixel alignment adjustment (hereinafter referred to as alignment adjustment) of a plurality of liquid crystal panels (also referred to as light valves) for modulating light separated into red, green, and blue, and within a focus allowable depth of a projection lens. By eliminating the mechanism for adjusting the position of each liquid crystal layer (hereafter referred to as focus adjustment) of the liquid crystal layer to be a subject, the size and weight of the imaging optical system are reduced, and the cost is reduced by reducing the number of parts and assembly adjustment work. It has been shown.

[0003]

However, what is proposed in these publications is that the liquid crystal panel is firmly fixed to the photosynthetic prism, and when repair / reproduction occurs, removal thereof is very troublesome. Met. Although the repairs that occur after shipment from the factory to the market are small, in the factory before shipment, the need for repair and refurbishment often arises for the following reasons.

1) Replacement / reproduction with a non-defective product due to breakage of a pattern due to chipping, destruction of a circuit element due to static electricity entering from an electrode terminal, contamination with hand oil or an adhesive or the like due to handling between liquid crystal panel processes. 2) In the early stage of mass production of liquid crystal panels, each manufacturing process is not stable, and complaints occur suddenly. In such a case, replacement / reproduction with a good product.

In addition, it is indispensable to reduce the alignment adjustment accuracy to less than 1/2 pixel between pixels in order to reduce the blurring of the screen and prevent color misregistration. Taking into account the chromatic aberration of magnification of the projection lens and the accuracy deviation of the combining surface of the photosynthetic prism, it is necessary to increase the adjustment accuracy within several microns. Further, although the focus adjustment accuracy varies depending on the value of the allowable circle of disorder and the F value of the projected image, the allowable depth of focus is about 100 μm.
Before and after, adjustment within this range is required. For this reason, an expensive adjustment machine that can be adjusted in six dedicated axes is required. Furthermore, it is actually impossible to arrange this expensive adjusting machine at all the bases where the after-sales service is performed, and it is necessary to return to a limited base or a manufacturing factory for repair / reproduction. Therefore, the following problems are pointed out.

[0006] 1) If it hinders quick after-sales service or replaces the unit of the imaging optical system, a very high cost burden is imposed on the customer. 2) Even in the case of repairing and rebuilding in a manufacturing plant, the operation rate of mass production is reduced, leading to an increase in cost.

Further, the liquid crystal panel and the photosynthetic prism are expensive parts. If three liquid crystal panels are used for red, blue, and green, and a high-definition liquid crystal panel compatible with a 640 × 480 dot arrangement is used, the parts become expensive. Since they account for about 20% to 40% of the cost, discarding them as defective products is a great waste and increases costs.

An object of the present invention is to provide a method of assembling an optical unit in which the number of assembling and adjusting operations is reduced.

[0009]

According to one aspect of the present invention, there is provided a method of assembling an optical unit, comprising: a plurality of modulating devices; a light synthesizing means for synthesizing light modulated by the plurality of modulating devices; An assembling method of an optical unit, comprising: a mounting member interposed between the light synthesizing unit and the mounting unit for mounting the modulation device to the light synthesizing unit; and a spacer member for fixing the modulated modulation device. (A) fixing the mounting member to the modulation device or the photosynthesis means; (b) adjusting the position of the modulation device with a flathead screw, an eccentric cam or an eccentric pin; Fixing the spacer member between the modulation device or the light combining means and the mounting member.

According to another aspect of the present invention, there is provided a method of assembling an optical unit, comprising: a plurality of modulating devices; a light synthesizing means for synthesizing light modulated by the plurality of modulating devices; A method for assembling an optical unit, comprising: a mounting member for mounting the modulation device to the light combining means; and a spacer member for fixing the modulated modulation device. Fixing the mounting member to the first modulation device or the light combining means, adjusting the position of the first modulation device with a flathead screw, an eccentric cam, or an eccentric pin; Fixing a spacer member between the light combining means and the mounting member; and (b) fixing the mounting member to another modulation device or the light combining means after the step (a). Performing the step of adjusting the position of the other modulator using a flathead screw, an eccentric cam or an eccentric pin, and fixing the spacer member between the other modulator and the light combining means and the mounting member. And.

According to another aspect of the present invention, there is provided the optical unit assembling method, wherein the spacer member is detachably fixed by heating.

Since the present invention is configured as described above, an optical unit having the following advantages can be obtained. 1) Since the mechanism for alignment adjustment and focus adjustment is omitted, the optical system becomes smaller and lighter by that much, and a small liquid crystal projector can be realized. If the liquid crystal panel is being miniaturized by taking advantage of the polysilicon TFT, if the optical system is to be miniaturized accordingly, the above-described adjustment mechanism is the main factor that hinders miniaturization. According to the present invention, since the adjustment mechanism can be omitted, the size of the apparatus can be reduced.

2) Further, by utilizing the space of the portion where the adjustment mechanism is omitted, the flow space of the cooling air can be increased. Further, since the mounting member, the frame, and the like form a reliable flow path, cooling efficiency can be improved, and cooling can be performed even with a small fan, which is advantageous for miniaturization.

3) By fixing the liquid crystal panel to a light synthesizing means, for example, a light synthesizing prism, positional deviation between the liquid crystal panels can be prevented. Therefore, it is possible to improve reliability such as resistance to disturbance, resistance to temperature change, and resistance to handling. Even when a combination of members having different coefficients of thermal expansion is used for bonding and fixing, it is possible to prevent a shift, a crack, and the like due to a change in temperature resistance by setting an optimum adhesive and bonding condition and a glass transition point with respect to a use temperature range. . Therefore, pixel shift can be suppressed, and it is possible to cope with higher definition products.

4) In addition to the reduction in component costs and assembly costs due to the elimination of the adjustment mechanism, downsizing of expensive optical components becomes possible, which greatly contributes 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.
In addition, the cost performance can be further enhanced by increasing the F value and increasing the amount of projection light.

6) Even if a defect occurs in the liquid crystal panel during the manufacturing process in the factory or in the market, a good liquid crystal panel can be used in the market or in the factory without using a dedicated alignment adjuster. It is possible to exchange and reproduce. Therefore, it is possible to reduce expensive after-sales service costs, repair the product in a short period of time, and improve the operation rate and reduce the defective rate in mass production of a dedicated alignment adjusting machine in a factory.

7) Further, there is an advantage that the focus adjustment can be omitted. In the design of a projection lens mainly composed of telecentric incident light, if the screen size of the liquid crystal panel does not change, it is more effective to use the fact that the focus shift can be relatively large in practical use.

8) In addition, since the liquid crystal panel is protected by the shield case and the holding member, it is possible to prevent chipping, cracking, electrostatic destruction, fouling, etc., which occur during handling, so that the yield is improved and the after-sales service is improved. Can be achieved.

9) In addition, since an optical unit in which a projection lens, a photosynthetic prism, a liquid crystal panel, and the like are integrated with the support frame can be formed,
Handling and assemblability are improved. In addition, the adjustment man-hour is not required, so that the adjustment man-hour can be reduced, and at the same time, the adverse effect due to the deviation of the characteristics of the projection lens can be prevented. Furthermore, it has applicability to replace the cross dichroic mirror method. 10) Furthermore, it is possible to replace the support frame with a housing of an optical system and integrate it.

[0021]

FIG. 1 is a plan view showing the structure 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, 1c control light (2a, 2b, 2c) obtained by separating light from a light source (not shown) into red, green, and blue lights by a separation optical system (not shown). (Not shown). Polarizing plates 3 are arranged on the emission sides of the liquid crystal panels 1a, 1b, 1c, respectively, and are attached and fixed to panel glasses of the liquid crystal panels 1a, 1b, 1c, respectively. The mounting member 4 has a prismatic shape made of a glass material, a ceramic material, a resin material, or the like, and one side surface of the prismatic shape is bonded and fixed to both sides of the liquid crystal panels 1a, 1b, 1c, respectively. An inclined portion 4a is formed on the other side surface. The spacer members (plurality) 5 are made of a wedge-shaped glass material, and are arranged below the inclined portion 4a.
The photosynthetic prism 6 includes a dichroic layer, the light incident surface of which is arranged to face the liquid crystal panels 1a, 1b, 1c, and converts the image light modulated by the liquid crystal panels 1a, 1b, 1c. The light is synthesized by the dichroic layer and projected on a screen (not shown) by the projection lens 7.

Note that one side surface of the mounting member 4 is bonded and fixed to the panel glass surfaces of the liquid crystal panels 1a, 1b, 1c. At this time, the mounting member 4 does not cover or abut the output side polarizing plate 3. As shown in FIG. Also, the inclined portion 4a of the mounting member 4
The spacer member 5 is inserted into a gap having a triangular cross section formed between the beam and the light incidence surface of the photosynthetic prism 6, and is fixed to each other by an adhesive layer formed in the minimum gap.

Next, a working method of assembling and alignment adjustment will be described. The liquid crystal panel unit is formed by fixing the mounting member 4 to each of the liquid crystal panels 1a, 1b, and 1c with a light curable adhesive that is cured by visible light and softened by heating. Then, the liquid crystal panel unit is chattered by the alignment adjuster and brought to the light incident surface position of the photosynthetic prism 6. Position adjustment in the X and Y axes perpendicular to the optical axis of the projection lens 7, position adjustment in the rotation direction of Xθ and Yθ about the X and Y axes, and a liquid crystal surface in the focal plane of the projection lens 7 Position adjustment is performed so that

Next, spacer members (a plurality of members) in which a photocurable adhesive is applied to a gap having a triangular cross section formed between the light incident surface of the photosynthetic prism 6 and the inclined portion 4a of the mounting member 4.
5 is inserted, and the adhesive is cured by irradiation with light such as ultraviolet rays and fixed.

Next, focusing is performed on the liquid crystal panels 1a and 1c in the same manner as described above.
On the basis of b, rotation adjustment in a plane formed by the X and Y axis directions and the XY axes is performed by an alignment adjuster so that the pixels match each other. After positioning is completed, a wedge 5 coated with a photocurable adhesive is inserted into a gap having a triangular cross section formed by the inclined portion 4a of the mounting member 4 and the light incident surface of the photosynthetic prism 6, as described above. Then, a prism unit is formed by irradiating light such as ultraviolet rays and curing and bonding.

FIG. 2 is a block diagram showing a configuration of a control device for performing the above-mentioned assembling work and alignment adjusting work. In the figure, a CRT 101 and a storage device 102 are connected to a personal computer 100,
The personal computer 100 drives the drive circuit 104 via the control device 103. The drive circuit 104 controls the six-axis manipulator 105 to perform the focus adjustment and the alignment adjustment on the liquid crystal panels 1b, 1a, and 1c in FIG. 1 described above, respectively. When the adjustment is completed, the drive circuit 104 drives the ultraviolet device 107 to irradiate light such as ultraviolet light to cure the adhesive and fix the mounting member 4 to the photosynthetic prism 6. In this adjustment, the image from the projection lens 7 of the optical unit 106 is directly or projected on the screen and the CCD camera 10
8 and the image 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 liquid crystal panels 1a, 1b, 1c.
The test pattern 113 is displayed. The above-mentioned adjustment is performed while operating the personal computer 100 and controlling the six-axis manipulator 105 while watching the display pattern.

Next, another configuration example of the holding member 4 of FIG. 1 will be described. FIGS. 4A to 4C are explanatory views showing other examples of the configuration of the mounting member 4 in FIG. FIG.
In the example of (A), the spacer member 5 is connected to the liquid crystal panel 1.
b and the mounting member 4. The gap of the triangular cross section formed between the inclined portion 4a formed on the other side surface of the mounting member 4 and the liquid crystal panel 1b is often not constant. Therefore, if the area is divided into two or three in the vertical direction, it is easy to secure the bonding area in conformity with the shape of each insertion portion, and it is possible to suppress the amount of protrusion to the outside, thereby preventing interference with adjacent members.

In the example shown in FIG. 4B, the mounting member 4 is formed integrally with the photosynthetic prism 6, thereby enabling the assembling work to be streamlined. Further, in the example of FIG. 4C, the adjacent mounting members 4 are integrated, and the mounting members 4 are bonded and fixed to the corners of the photosynthetic prism 6 as shown.

If the liquid crystal panel becomes defective after the optical unit 106 is manufactured, or if a defective product is mixed, the bonding portion between the liquid crystal panels 1a, 1b, and 1c and the mounting member 4 is removed. Heat with a dryer, laser light, etc. 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 photosynthetic prism 6, a non-defective liquid crystal panel unit can be adhered and fixed to one side surface of the mounting member 4 and replaced again. Further, in this case, since the mutual positional relationship between the focal directions is not changed, the focus adjustment operation can be omitted.

FIG. 5 is a plan view showing 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, portions different from the embodiment of FIG. 1 will be described.
The frame 8 corresponding to the mounting member 4 shown in FIG. 1 is made of a resin material having a high heat resistance and a small expansion coefficient (such as PPS or reinforced polycarbonate material), and holds and fixes a metal holding member 9. An L-shaped positioning portion 8a protruding from the four corners is provided on the front side of the frame body 8, and an inclined portion 8b engaging with the wedge 5 is provided on the back side.

A rectangular window hole 9a is formed at the center of the holding member 9.
An adhesive curable by visible light is applied to the periphery of the window hole 9a, the liquid crystal panel 1b is adhered, and the liquid crystal panel 1b is cured and fixed by light irradiation. And window hole 9a
Are shielded from light incident on the liquid crystal panel 1b by a frame portion at the periphery. A flexible printed circuit (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 of the recess of the frame 8 to the outside. Further, the holding member 9 is provided with an elastic portion 9b formed by projecting and expanding in a T-shape from each side of the square frame of the main body, and the elastic portion 9b is provided with a positioning portion 8a of the frame body 8. Is temporarily fixed using elastic force. Then, the holding member 9 is a visible light curing type at a square corner of the main body, and is permanently fixed to the frame 8 with an adhesive softened by heating to form a liquid crystal panel unit. The liquid crystal panels 1a and 1c are similarly attached to the photosynthetic prism 6 to form liquid crystal panel units corresponding to those liquid crystal panels. The assembly and alignment adjustment work is performed in the same manner as in the case of FIG. 1 to form a prism unit.

The replacement of defective liquid crystal panels 1a, 1b, 1c after the formation of the prism units shown in FIGS. 5 and 6 is performed by replacing the bonding portion between the holding member 9 and the frame 8 in the same manner as in FIG. After heating to soften the adhesive, the holding member 9 is peeled off. Then, it can be reassembled into a non-defective liquid crystal panel unit, and the same assembling and adjustment operations can be performed. At this time, if the accuracy of the liquid crystal surface position of the liquid crystal panel unit is set within an allowable value, the focus adjustment operation can be omitted. However, if the alignment adjustment work can be performed manually without using a dedicated alignment adjustment machine, the workability is further improved.

FIGS. 7A and 7B are partial cross-sectional views of the embodiment shown in FIGS. In FIG. 7A, a partially bent portion 9c (plurality) is provided on the outer peripheral portion of the main body of the holding member 9 and used to stop the flow of the adhesive of the liquid crystal panel 1b. The provision of the bent portion 9c is effective in increasing the fixing force to the liquid crystal panel 1b when the fluidity of the adhesive is high.

In FIG. 7B, the slanted portion of the head of the flat head screw 12 is engaged with the outer peripheral portion of the main body of the holding member 9, and the screw is rotated up and down in a plane including the X and Y axes and the XY axis. Make adjustments. An adhesive is applied to the threaded portion of the flathead screw 12, and the adhesive is hardened in close contact with a counterpart member by a screw tightening pressure, and an anaerobic hardening type is used. In addition, a resin film may be formed on the screw surface to loosen and increase torque. The countersunk screw 12 can be supported by the elastic force of the elastic portion 9b in the opposite direction only by attaching and adjusting the countersunk screw 12 on the side where the position of the liquid crystal panel 1b is shifted.

FIGS. 7C and 7D are partial cross-sectional views showing an application example of FIG. 7B. The example of FIG. 7C is an example in which the eccentric cam 13 attached to the dowel so as to have a friction torque is used instead of the flathead screw of FIG. 7B. In the example of FIG. 7D, an eccentric pin 1 is inserted into a hole instead of the eccentric cam 13.
4 is an example of fitting. Both of these eccentric cams 13 and eccentric pins 14 are locked by friction stoppers.

FIG. 8 is a plan view showing another example of the structure of the frame 8 and the holding member 9 in the embodiment of FIG. Connection portions 9d (four places) between the main body portion of the holding member 9 and the elastic portion 9b
Are formed, the dowels 8b (two) provided on the frame body 8 are fitted into the holes 9e and 9f provided in the connecting portion 9d, and the holding member 9 is attached to the frame body 8 with the screws 15 (four). It is fixed. The screw 15 also serves to prevent deformation of the main body, such as warpage and twisting, due to the reaction force of the elastic portion 9b.

When the liquid crystal panel needs to be replaced,
Remove the screw 15 and remove the defective liquid crystal panel unit. After the dowel 8b is cut, the holding member 9 to which the non-defective liquid crystal panel is adhered is temporarily fixed by hooking the elastic portion 9b on the positioning portion 8a. After the alignment is adjusted using the adjustment members 12, 13, and 14 shown in FIGS.

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, in which the holding member 9 is set on a jig (not shown), the liquid crystal panel 1b is positioned, and a spindle (not shown) chucked by vacuum is lowered and held. It is set on the 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 periphery of the liquid crystal panel 1b at 12 o'clock, 4 o'clock and 8 o'clock and the bent portion 9c. Then, it is cured by irradiating it with visible light. Further, the other portion 16b is reinforced with a visible light curable adhesive having elasticity such as silicone resin. The other portion 16b can be omitted if the strength of the fixation of the dot 16a is sufficient. Further, if the missing portion of the bent portion 9c is complemented by another member, a further reinforcing effect can be obtained and the stability can be improved.

FIG. 10 is a plan view showing another configuration example of the frame 8 and the holding member 9 in 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 not on the holding member 9 but on the frame 8. Elastic portions 8c, which project from four sides of the main body of the frame 8 and have elasticity, come into contact with the corners of the main body of the holding member 9 to provide elasticity and temporarily fix them. Then, the projecting piece 9 of the holding member 9
d is permanently fixed with screws 15. Note that only the central portion connecting the pair of elastic portions 8c is connected to the main body of the frame 8, and the other portions are in a state of floating with respect to the main body of the frame 8. In this 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 structure of a liquid crystal panel unit according to another embodiment of the present invention. In the present embodiment, the liquid crystal panel 1b is adhesively fixed to the shield cases 17a and 17b made of a conductive member such as a metal, as in the embodiment of FIG. Square window holes are provided in the center portions of the shield cases 17a and 17b, and the window holes 17 provided in the shield case 17b are provided.
c has the same function 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. It should be noted that when 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 sectional view showing a modification of FIG. In the present embodiment, a pair of shield cases 17 shown in FIG.
This is an example in which the outer shield case 17b is omitted from a and 17b.

In the embodiment of FIGS. 12 and 13,
Light incidence surface of photosynthetic prism 6, mounting member 4, and polarizing plate 3
As a result, a flow path in the vertical direction (a direction orthogonal to the paper surface) is formed, and since cooling air is sent from below, there is no obstacle, so that the entrance 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 photosynthetic prism 6 is positioned and fixed on the support frame 18. Depressions (3 places) provided in support frame 18
The liquid crystal panels 1a, 1b, and 1c are bonded and fixed to each other via a spacer member 5 with a visible light curable 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 the optical unit according to the application example of FIG. In this embodiment, two dowels 1 are provided in the concave portions with respect to the support frame 18 of the embodiment shown in FIG.
8a is provided. 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 play, thereby enabling the same alignment adjustment work as in the embodiment of FIG. After the adjustment, it is fixed with an adhesive which is softened by heating in a visible light curing type. According to the structure shown in FIGS. 14 and 15, the light combining prism 6 can be replaced with a dichroic mirror.

FIG. 16 is a sectional view of an embodiment in which the light combining prism 6 of FIG. 14 is replaced by a dichroic mirror 20. In addition, the support frame 18 can be integrated with an optical system housing that supports a mirror that separates lamp light into red, green, and blue light and a mirror that reflects and guides light. Further, the support frame 18
The optical unit can be formed by housing the prism units of FIGS. 1, 5, 8, and 12 therein.

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 shown in FIG. 17A, the output-side polarizing plate 3 is attached to the light incident surface of the photosynthetic prism 6, and the liquid crystal panel 1b is disposed immediately near the polarizing plate 3. And FIG.
In the state where the alignment adjustment operation is performed and the positioning is completed in the same manner as in the above embodiment, the spacer is adhered and fixed by the spacer member 5.

In the embodiment shown in FIG. 17B, a projection 3a having an inclined surface is formed on the emission-side polarizing plate 3, and the inclined surface of the projection 3a is engaged with the inclined surface of the spacer member 5. Ensures stable adhesive strength.

In the embodiment shown in FIG. 17C, a transparent sheet member 19 is attached to the light incidence surface of the light combining prism 6. Further, the output side polarizing plate 3 is attached to the liquid crystal panel 1b. Transparent sheet member 19 and emission-side polarizing plate 3
And a spacer member 5 is disposed between them to fix them. The replacement of the defective liquid crystal panel 1 is shown in FIGS.
In the embodiment shown in FIG.
In the embodiment (C), the transparent sheet member 19 is peeled off, re-attached and reproduced. Of course, by removing the spacer member 5, the liquid crystal panel 1 can be replaced.

Although not shown in the drawings in the above-described embodiment, a cooling fan is arranged below the photosynthetic prism 6 in the sectional direction. The cooling fan blows up cooling air to absorb heat from the entrance surface of the liquid crystal panel, the exit-side polarizing plate, and the entrance-side polarizing plate (not shown). In the present invention, since a mechanism for adjusting the alignment and the focus can be omitted, the flow path can be widened by a space for which the adjustment mechanism is unnecessary. Further, a flow path can be formed in the vertical direction by the mounting member 4, the frame 8, the support frame 18, and the like.

[Brief description of the drawings]

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.

FIG. 2 is a block diagram showing a configuration of a control device for performing an assembling operation and an alignment adjusting operation of the optical unit of FIG. 1;

FIGS. 3A and 3B are explanatory diagrams of images displayed on a CRT when performing an alignment adjustment operation.

FIGS. 4A to 4C are partial plan views showing other examples of the configuration of the mounting member of FIG. 1;

FIG. 5 is a plan view illustrating a partial configuration of an optical unit of a liquid crystal projector according to another embodiment of the present invention.

FIG. 6 is an enlarged front view of the optical unit of FIG. 5;

7A and 7B are partial cross-sectional views of the embodiment of FIGS. 5 and 6, and FIGS. 7C and 7D are cross-sectional views showing an application example of the embodiment of FIG. 7B. .

FIG. 8 is a front view showing another configuration example of the frame and the holding member of the embodiment in FIG. 6;

FIG. 9 is a front view showing details of a holding member of FIG. 8;

FIG. 10 is a front view showing still another configuration example of the frame and the holding member of the embodiment in FIG. 6;

FIG. 11 is a front view showing details of a holding member of FIG. 10;

FIG. 12 is a plan view illustrating a partial configuration of an optical unit of a liquid crystal projector according to another embodiment of the present invention.

FIG. 13 is a plan view showing an application example of the embodiment in FIG. 12;

FIG. 14 is a plan view showing a partial configuration of an optical unit of a liquid crystal projector according to another embodiment of the invention.

FIG. 15 is a plan view showing a partial configuration of an optical unit of a liquid crystal projector according to another embodiment of the invention.

FIG. 16 is a plan view illustrating a configuration of a part of an optical unit of a liquid crystal projector according to another embodiment of the invention.

FIGS. 17A to 17C are plan views each showing a partial configuration of an optical unit of a liquid crystal projector according to another embodiment of the present invention.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 21/14 G02F 1/13 505 G02F 1/1333 G02F 1/1335

Claims (3)

(57) [Claims] A plurality of modulating devices; a light synthesizing means for synthesizing light modulated by the plurality of modulating devices; an intervening light modulating device and the light synthesizing means; An assembly method for an optical unit, comprising: an attachment member for attachment; and a spacer member for fixing the position-adjusted modulation device, comprising: (a) attaching the attachment member to the modulation device or the light combining means. Fixing; (b) adjusting the position of the modulator with a countersunk screw, an eccentric cam or an eccentric pin; and (c) the spacer member between the modulator or the photosynthesis means and the mounting member. A method of assembling an optical unit, comprising: fixing an optical unit. A plurality of modulating devices; a light combining unit that combines light modulated by the plurality of modulating devices; a light interposing unit between the modulating device and the light combining unit; A method for assembling an optical unit comprising: a mounting member for mounting; and a spacer member for fixing the position-adjusted modulation device, wherein: (a) the first modulation device or the light combining means includes: Fixing the mounting member, adjusting the position of the first modulator using a flathead screw, an eccentric cam or an eccentric pin, and positioning a spacer between the first modulator or the photosynthesis means and the mounting member. Fixing the member; (b) after the step (a), fixing the mounting member to another modulation device or the photosynthesis means; and fixing the countersunk screw, eccentric cam or eccentric pin. Therefore, a step of adjusting the position of the other modulator, and a step of fixing the spacer member between the other modulator or the light combining means and the mounting member, comprising: How to assemble the unit. 3. The method for assembling an optical unit according to claim 1, wherein said spacer member is fixed so as to be removable by heating.