JPH11242185A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To narrow a margin width formed around an image forming area of a liquid crystal light bulb and to make no shadow in the edge of a projected image to increase the brightness of the projected image. SOLUTION: A position adjustment mechanism is provided with a reference frame 600, a first mobile frame 620, and a second mobile frame 640. The first mobile frame 620 which has a first adjustment screw 660 on the side face side is fitted to the incidence face side of the reference frame, and the second mobile frame which has a second adjustment screw 670 on the upper face side is fitted to the upper side of the first mobile frame 62. An optical element 320 is fixed to the incidence face side of the second mobile frame 640 by fixing members 645, 646, 650, and 652. The first mobile frame 620 can be moved in the horizontal direction to the reference frame 600 by adjusting the first adjustment screw 660. The second mobile frame 640 can be moved in the vertical direction to the first mobile frame 620 by adjusting the second adjustment screw 670.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which light emitted from a light source is modulated according to an image signal using a light modulation means such as a liquid crystal light valve, and an image formed by the modulated light beam is projected. The present invention relates to a projection display device that performs enlarged projection on a screen via a lens. More specifically, the present invention relates to a structure in which an image forming area (light modulation area) of light modulation means such as a liquid crystal light valve can be illuminated in an appropriate state in a projection display device of this type.

[0002]

2. Description of the Related Art A projection display apparatus having a configuration in which a modulated light beam corresponding to an image signal is formed using a liquid crystal light valve and an image formed by the modulated light beam is enlarged and projected on a screen is disclosed in, for example, Japanese Patent Laid-Open No. It is disclosed in JP-A-111806. As shown in FIG. 15, the projection type display device disclosed in this publication is designed to uniformly illuminate an image forming area (light modulation area) of a liquid crystal light valve 925 as light modulation means with light from a light source. And an integrator optical system 923 having two lens arrays 921 and 922.

FIG. 15 shows a light source lamp unit 92.
The single light beam emitted from the first lens array 92
The light is spatially separated into a plurality of partial light beams by the lens 921a constituting the first lens array 921, and is superimposed on the liquid crystal light valve 925 via the lens 922a constituting the second lens array 922.

Here, in the projection type display device as shown in FIG. 15, if the image forming area of the liquid crystal light valve 925 cannot be accurately illuminated, the brightness of the image projected on the projection surface may decrease. In addition, adverse effects such as shadows appearing on the edges of the projected image occur. Therefore, as shown in FIG. 16, the image forming area A of the liquid crystal light valve 925 includes the liquid crystal light valve 925 and the integrator optical system 9.
23, the positioning accuracy of the lens arrays 921 and 922, and the lenses 921a and 92
In consideration of an error such as the focal length of 2a and the positioning accuracy of other optical elements arranged on the optical path, a certain margin M is secured around the optical element. That is, the size of the image forming area A of the liquid crystal light valve 925 is set to be slightly smaller than the size of the illumination area B due to the light emitted from the light source. Thus, even if the illumination area B is shifted vertically or horizontally, the image forming area A does not protrude from the illumination area B. With such a structure, it is possible to avoid such a problem that a shadow is formed on an edge of the projected image or the brightness of the projected image is reduced. In order to be able to cope with errors such as the positioning of each component widely as described above, the width of the margin M should be widened.

[0005]

On the other hand, in order to make the projected image brighter, it is preferable to increase the use efficiency of the light illuminating the liquid crystal light valve 925. However, as described above, if the width of the margin M is set wide so as to widely cope with errors such as positioning of components,
The light use efficiency is reduced by that amount, and the projected image also becomes dark. So, from this perspective,
It is desirable to reduce the margin width formed around the image forming area of the liquid crystal light bubble as much as possible. But,
When the margin width is reduced, as described above, the illumination region is deviated from the image forming region of the liquid crystal light valve, and there is a high possibility that a shadow is formed on the edge of the projected image.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and has been made to reduce a margin width formed around an image forming area of a liquid crystal light valve and to form a shadow on an edge of a projected image. An object of the present invention is to provide a technique capable of increasing the brightness of a projected image without making it.

[0007]

In order to solve the above problems, a first projection type display device according to the present invention comprises a light source and a light beam emitted from the light source, the image signal being supplied to a given image signal. Light modulating means for modulating according to the following, a projection optical system for projecting an image formed by modulated light emitted from the light modulating means on the projection surface, and light between the light source and the light modulating means. A first lens array and a second lens array provided on a road and having a plurality of small lenses arranged in a matrix, and at least one of the first and second lens arrays,
A position adjustment mechanism that can adjust the installation position in a first direction orthogonal to the optical axis of the projection display device and in a second direction orthogonal to the optical axis and the first direction. The position adjusting mechanism includes a support, a first movable body movably held by the support, and a second movable body movably held by the first movable body. The first movable body includes a first position adjustment member for adjusting a position of the first movable body with respect to the support along the first direction, and the second movable body And a second position adjusting member for adjusting a position of the second movable body with respect to the first movable body along the second direction, and attaching and detaching the lens array to and from the second movable body. And a fixing member for fixing as possible.

According to the first projection type display device of the present invention, the utilization efficiency of the illumination light for irradiating the light modulating means can be improved,
The projected image can be brightened. Even if the margin width formed around the light modulation area (image forming area) of the light modulation means is narrowed, the position of the illumination area with respect to the light modulation means is adjusted so that the light modulation area is located within the illumination area. Since the fine adjustment can be performed, there is no adverse effect such as a shadow formed on the edge of the projected image due to a shift in both the illumination area and the light modulation area of the light modulation unit.

That is, after each component of the optical system is installed, the light modulating area of the light modulating means is illuminated via the first lens array and the second lens array (integrator optical system), and the illuminating area is illuminated. If the light modulation area is out of the light modulation area of the modulation means, the installation position of the first lens array or the second lens array is finely adjusted so that the light modulation area of the light modulation means is completely included in the illumination area. State. Therefore, the width of the margin formed around the light modulation area of the light modulation means can be reduced in consideration of a shift between the illumination area and the light modulation area due to a positioning error of the optical component or the like.

Next, a second projection type display device according to the present invention comprises a light source, a first optical element for dividing a light beam from the light source into a plurality of partial light beams, and a position near the position where the partial light beams converge. A condenser lens array for condensing the plurality of partial light beams respectively divided by the first optical element, and each of the partial light beams condensed by the condenser lens array being approximately 1 A second optical element having a polarization converter that converts the light into linearly polarized light of a type and emits the light; a third optical element that superimposes a plurality of partial light beams emitted from the second optical element; Light modulating means for modulating a light beam emitted from the third optical element in accordance with a given image signal; and projecting an image formed by the modulated light beam emitted from the light modulating means on the projection surface. A projection optical system; Or for at least one optical element of the third optical element, a first direction perpendicular to the optical axis of the projection display apparatus, the optical axis and the first
A position adjustment mechanism that can adjust the set position thereof in a second direction orthogonal to the direction of. The position adjustment mechanism comprises a support, and a first member movably held by the support.
And a second movable body movably held by the first movable body, wherein the first movable body is the first movable body of the first movable body with respect to the support. A first position adjusting member for adjusting a position along a direction of the first movable body, wherein the second movable body has a second position with respect to the first movable body.
A second position adjusting member for adjusting a position of the movable body along the second direction, and a fixing member for fixing the optical element to the second movable body. And

Here, the first optical element corresponds to the above-described first lens array, and the third optical element corresponds to the above-described second lens array.

A second projection type display device according to the present invention includes a condensing lens array and a polarization converter in addition to the configuration of the first projection type display device. Along with this, the use efficiency of light can be further improved by using a polarization converter as well as the same effect as that of the above-mentioned first projection display device, so that a bright projection image can be obtained. Become. In addition, since the condenser lens array can efficiently guide the partial light beam to the polarization converter,
From this point, the light use efficiency can be improved, and a brighter projected image can be obtained.

The third optical element may be fixed to the second movable body so as to move together with the second optical element. In this case, the same operation and effect can be obtained. Further, since the second optical element and the third optical element can be collectively fixed to the position adjustment mechanism, the condensing lens array included in the second optical element, the polarization converter, and the third Relative positioning between the optical elements can be accurately performed in advance.

In the first and second projection display devices, the first position adjusting member has a first male screw portion and a circumferential groove provided at one end of the first male screw portion. The first circumferential groove portion, the end face of the first male screw portion, and the first circumferential groove portion.
And a first operation groove for rotation operation provided on at least one of the end faces of the peripheral groove portion of the first peripheral groove portion, wherein the first peripheral groove portion is provided with the support member and the first movable member. While being fitted into one of them in a freely rotatable state,
The first male screw portion is screwed into a female screw portion provided on the other side, and the second position adjusting member has a second male screw portion and a circumferential groove at one end of the second male screw portion. A second peripheral groove provided, a second operation groove for rotation operation provided on at least one of an end surface of the second external thread portion and an end surface of the second peripheral groove, With
The second circumferential groove is fitted into one of the first and second movable bodies in a freely rotatable state, and the second male screw is screwed into a female screw provided on the other. It can be configured.

The above-mentioned "freely rotatable state" means a state where only the rotation around the rotation axis is possible at the fitted position.

In the above configuration, when the adjustment jig is inserted into the first operation groove of the first position adjustment member and the first position adjustment member is rotated, the first circumferential groove portion is rotated by the amount of rotation. Accordingly, it freely rotates at the position where the first circumferential groove is fitted.
At this time, the female thread into which the first male thread is screwed is
The direction of the rotation axis (first
Direction). As a result, the position of the first movable body with respect to the support moves along the first direction according to the amount of rotation of the first position adjustment member. Further, when the adjustment jig is inserted into the second operation groove of the second position adjustment member and the second position adjustment member is rotated, the second circumferential groove portion becomes the second peripheral groove portion in accordance with the amount of rotation. It freely rotates at the position where the circumferential groove is fitted. At this time, the female thread into which the second male thread is screwed moves in the rotation axis direction (second direction) according to the amount of rotation of the second position adjustment member. As a result, the position of the second movable body with respect to the first movable body moves in the second direction according to the amount of rotation of the second position adjustment member. Therefore, according to the above configuration, the mounting position of the lens array or the optical element fixed to the position adjusting mechanism can be easily adjusted along the first and second directions.

[0017]

Next, embodiments of the present invention will be described based on examples. In the following description, unless otherwise specified, the traveling direction of light is 1 in the z direction and z direction.
The direction of 2 o'clock is the y direction, and the direction of 3 o'clock is the x direction.

A. Configuration of Projection Display Device: FIG. 1 is a schematic plan view showing the configuration of a projection display device incorporating the optical unit of the present invention. This projection display device includes a light source unit 20, an optical unit 30, a projection lens 40,
And

The optical unit 30 includes an integrator optical system 300 having a first optical element 320, a second optical element 330, and a superimposing lens 370 mounted on a position adjusting mechanism 310 described later. Further, a color light separation optical system 380 including dichroic mirrors 382 and 386 and a reflection mirror 384 is provided. Further, a light guide optical system 390 including an incident side lens 392, a relay lens 396, and reflection mirrors 394, 398 is provided. In addition, three field lenses 400, 402, 4
04 and three liquid crystal light valves 410R, 410G,
410B, a cross dichroic prism 420,
It has. These optical elements are attached to respective attachment positions provided on the lower light guide 32D and the upper light guide 32U (not shown).

The light source unit 20 is arranged on the incident side of the first optical element 320 of the optical unit 30. The projection lens 40 is arranged on the exit surface side of the cross dichroic prism 420 of the optical unit 30.

FIG. 2 is an explanatory diagram showing an integrator illumination optical system for illuminating three liquid crystal light valves which are illumination areas of the projection display apparatus shown in FIG. The integrator illumination optical system includes a light source 200 provided in the light source unit 20 and an integrator optical system 300 provided in the optical unit 30. The integrator optical system 300 includes a first optical element 320, a second optical element 330, and a superimposing lens 370 as a third optical element.
And. The second optical element is a condenser lens 340
, A light shielding plate 350, and a polarization conversion element array 360. Note that FIG. 2 shows only main components for explaining the function of the integrator illumination optical system for ease of explanation.

The light source 200 includes a light source lamp 210 and a concave mirror 212. Radial light rays (radiated light) emitted from the light source lamp 210 are reflected by the concave mirror 212 and emitted in the direction of the first optical element 320 as substantially parallel light beams. As the light source lamp 210, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is often used. As the concave mirror 212, a parabolic mirror is preferably used.

FIG. 3 is a front view and a side view showing the appearance of the first optical element 320. First optical element 320
Is a lens array in which minute small lenses 321 having a rectangular outline are arranged in a matrix of M rows in the vertical direction and 2N columns in the horizontal direction. From the center in the lateral direction of the lens, there are N rows to the left and N rows to the right. In this example, M = 1
0, N = 4. The external shape of each small lens 321 viewed from the z direction is set to be substantially similar to the shape of the liquid crystal light valve 410. For example, if the aspect ratio (the ratio between the horizontal and vertical dimensions) of the image forming area of the liquid crystal light valve is 4: 3, the aspect ratio of each small lens 321 is also set to 4: 3.

The condenser lens 340 of the second optical element 330
Is a lens array having the same configuration as the first optical element. The first optical element 320 and the condenser lens 34
The direction of the 0 lens may be in either the + z direction or the −z direction. Moreover, as shown in FIG. 2, they may face different directions.

As shown in FIG. 2, the polarization conversion element array 360 has two polarization conversion element arrays 361 and 362 arranged symmetrically with respect to the optical axis. FIG. 4 is a perspective view showing the appearance of the polarization conversion element array 361. The polarization conversion element array 361 includes a polarization beam splitter array 363 and a λ / 2 phase difference plate 364 selectively disposed on a part of the light exit surface of the polarization beam splitter array 363.
(Shown by oblique lines in the figure). The polarizing beam splitter array 363 has a shape in which a plurality of columnar translucent members 365 each having a parallelogram cross section are sequentially bonded. Polarized light separating films 366 and reflective films 367 are alternately formed on the interface of the light transmitting member 365. λ
The / 2 retardation plate 364 is selectively attached to the x-direction mapped portion of the light exit surface of the polarization separation film 366 or the reflection film 367. In this example, a λ / 2 retardation plate 364 is attached to the x-direction mapped portion of the light exit surface of the polarization separation film 366.

The polarization conversion element array 361 has a function of converting an incident light beam into one type of linearly polarized light (for example, s-polarized light or p-polarized light) and emitting the same. FIG. 5 is an explanatory diagram showing functions of the polarization conversion element array 361. Non-polarized light (incident light having a random polarization direction) containing an s-polarized component and a p-polarized component is incident on the incident surface of the polarization conversion element. This incident light is first transmitted by the polarization separation film 366 to s.
The light is separated into polarized light and p-polarized light. The s-polarized light is reflected almost vertically by the polarization splitting film 366, and is further reflected by the reflecting film 367 before being emitted. On the other hand, the p-polarized light passes through the polarization separation film 366 as it is. The exit surface of the p-polarized light transmitted through the polarization separation film is provided with a λ / 2 retardation plate 3.
The p-polarized light is converted into s-polarized light and emitted. Therefore, most of the light that has passed through the polarization conversion element is emitted as s-polarized light. When the light emitted from the polarization conversion element is desired to be p-polarized light, the λ / 2 retardation plate 364 is arranged on the emission surface from which the s-polarized light reflected by the reflection film 367 is emitted. I just need.

It should be noted that one block including one adjacent polarization separation film 366 and one reflection film 367 and one λ / 2 retardation plate 364 is regarded as one polarization conversion element 368. Can be. The polarization conversion element array 361 is such that the polarization conversion element 368 has x
It is arranged in a plurality of rows in the direction. In this example,
It comprises four rows of polarization conversion elements 368.

Since the polarization conversion element array 362 is completely the same as the polarization conversion element array 361, the description is omitted.

FIG. 6 is a plan view of the light shielding plate 350. The light shielding plate 350 includes two polarization conversion element arrays 361 and 36.
Of the two light incident surfaces, the opening 351 is provided in a substantially rectangular plate-like body so that light is incident only on the light incident surface corresponding to the polarization separation film 366.

The unpolarized light emitted from the light source 200 shown in FIG.
Are divided into a plurality of partial light beams 202 by a plurality of small lenses 321 of the optical element 320 and a plurality of small lenses 341 of the condenser lens 340 included in the second optical element 330, and the two polarization conversion element arrays 361, 362
Is collected near the polarization separation film 366 of FIG. In particular, the condensing lens 340 converts the plurality of partial light beams emitted from the first optical element 320 into two polarization conversion element arrays 361 and 36.
It has a function of guiding light to be condensed on the second polarization separation film 366. Two polarization conversion element arrays 361 and 362
Are converted into one type of linearly polarized light and emitted as described above. The plurality of partial light beams emitted from the two polarization conversion element arrays 361 and 362 are superimposed on a liquid crystal light valve 410 (410R, 410G, 410B) described later by the superimposing lens 370. This superimposing lens 370 corresponds to the third optical element of the present invention. Thus, the integrator illumination optical system can uniformly illuminate the liquid crystal light valve 410.

In the projection display device shown in FIG. 1, the reflection mirror 372 is provided to guide the light beam emitted from the superimposing lens 370 toward the color light separation optical system 380. This is not always necessary depending on the configuration of the illumination optical system.

The color light separation optical system 380 includes two dichroic mirrors 382 and 386, and a superimposing lens 370.
Has a function of separating the light emitted from the light into three color lights of red, green, and blue. First dichroic mirror 38
2 transmits the red light component of the light emitted from the superimposing lens 370 and reflects the blue light component and the green light component. The red light transmitted through the first dichroic mirror 382 is reflected by the reflection mirror 384, passes through the field lens 400, and the liquid crystal light valve 41 for red light.
Reaches 0R. The field lens 400 converts each partial light beam emitted from the superimposing lens 370 into a light beam parallel to its central axis (principal ray). The same applies to the field lenses 402 and 404 provided before the other liquid crystal light valves 410G and 410B.

Of the blue light and the green light reflected by the first dichroic mirror 382, the green light is reflected by the second dichroic mirror 386, passes through the field lens 402, and the liquid crystal light valve 410G for green light.
Reach On the other hand, the blue light passes through the second dichroic mirror 386, and the light guide optical system 390, that is, the incident side lens 392, the reflection mirror 394, and the relay lens 39
6, through the reflection mirror 398, and further through the field lens 404, to the liquid crystal light valve 41 for blue light.
Reaches 0B. The light guiding optical system 390 is used for blue light because the optical path length of blue light is longer than the optical path lengths of other color lights. This is to prevent it. That is, this is for transmitting the partial light beam incident on the incident side lens 392 to the field lens 404 as it is.

Three liquid crystal light valves 410R, 410
G and 410B function as light modulating means for modulating incident light in accordance with given image information (image signal). Thereby, three liquid crystal light valves 4
Each color light incident on 10R, 410G, 410B is modulated according to given image information to form an image of each color light.

Three liquid crystal light valves 410R, 410
The three colors of modulated light emitted from G and 410B enter the cross dichroic prism 420. The cross dichroic prism 420 has a function as a color light combining optical system that forms a color image by combining three color modulated lights. In the cross dichroic prism 420, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in an approximately X-shape at the interface between the four right-angle prisms. The modulated light of three colors is synthesized by these dielectric multilayer films to form synthesized light for projecting a color image. The combined light generated by the cross dichroic prism 420 is emitted toward the projection lens 40. The projection lens 40 has a function of projecting the combined light on a projection screen, and displays a color image on the projection screen.

B. Illumination area adjusting mechanism of liquid crystal light valve: In the projection type display device, as shown in FIG. 1, the first optical element 32 of the integrator optical system 300
0 is attached to a position adjusting mechanism 310 to be described later, and the illumination area on the liquid crystal light valve 410 is slightly smaller in the vertical direction (± y direction) or left and right (± x direction) than the image forming area of the liquid crystal light valve 410. It is adjustable.

FIG. 7A shows an integrator optical system 30.
FIG. 4 is a schematic diagram illustrating a relationship between an illumination area B on the liquid crystal light valve 410 and an image forming area A of the liquid crystal light valve 410. Note that, for ease of explanation, only the condenser lens 340 of the second optical element 330 is shown. Generally, the projection area of the projection screen is rectangular, and accordingly, the image forming area A of the liquid crystal light valve 410 is also rectangular. The illumination area B (the area shown by the two-dot chain line in the figure) by the integrator optical system 300 is also shaped accordingly. As described above, the shape of the illumination area B is determined by the outer shape of the small lens 321 (FIG. 3) that forms the first optical element 320.

As described in the conventional example, usually, the image forming area A of the liquid crystal light valve 410 is set to be one size smaller than the illumination area B. In other words, a margin having a predetermined width is provided around the image forming area A. This is because the first optical element 320 and the second optical element 320 of the integrator optical system 300 are provided by providing a margin.
The image forming area A is always included in the illumination area B even if the formation position of the illumination area fluctuates due to the positioning error of the optical components such as the optical element 330 and the superimposing lens 370. That's why.

On the other hand, in this embodiment, the first optical element 320 is mounted on the position adjusting mechanism 310 and mounted on the lower light guide 32D of the optical unit 30. FIG. 8 is a perspective view showing the appearance of the position adjustment mechanism 310. FIG. 9 is an exploded perspective view of the position adjustment mechanism 310. As shown in FIG. 9, the position adjusting mechanism 310 includes a reference frame 600, a first movable frame 620, a second movable frame 640, a first adjusting screw 660, and a second adjusting screw 670. , Is provided. The reference frame 600 corresponds to the support of the present invention, the first movable frame 620 corresponds to the first movable body, and the second movable frame 640 corresponds to the second movable body. In addition, the first adjustment screw 660 corresponds to a first position adjustment member, and the second adjustment screw 670 corresponds to a second position adjustment member.

A first movable frame 620 having a first adjustment screw 660 on the side surface is fitted on the incident surface side (upper side in FIG. 9) of the reference frame 600. The upper side of the first movable frame 620 Is further fitted with a second movable frame having a second adjustment screw 670 on the upper surface side. First movable frame 620
Is adjusted by adjusting the adjusting screw 660 so that the reference frame 600
To the left and right. In addition, the second movable frame 640 can adjust the first screw 670 by adjusting the adjustment screw 670.
The movable frame 620 can be moved in the vertical direction.

FIG. 10 shows the appearance of the reference frame 600, and FIG.
1 is an explanatory view showing an appearance of a first movable frame 620, and FIG. 12 is an explanatory view showing an appearance of a second movable frame 640. FIG.
(A), (B), (C), (D),
(E) and (F) respectively show the front (light incident surface), upper surface,
A bottom surface, a left side surface, a right side surface, and a back surface (light emitting surface) are shown.

As shown in FIG. 10 (E), the reference frame 600 has a substantially L-shaped side surface shape, and has a substantially rectangular reference frame portion 602 and a lower light guide. 32
And a pedestal portion 604 for attaching to D. Two screw holes 605 are provided at both left and right ends of the pedestal portion 604, and below one of the screw holes 605 (on the light emitting surface side),
A long guide groove 609 is provided along the optical axis LC.
The position adjusting mechanism 310 is attached to the lower light guide 32D via two screw holes 605 by attaching screws. At this time, the lower light guide 32D is attached so that the projection provided on the lower light guide 32D is fitted into the guide groove 609. This attachment will be described later.

As shown in FIG. 10 (A), the left and right frames are provided with protrusions 606 at substantially the same height. As shown in FIG. 10 (E), a first adjustment screw 660 (to be described later, center left side in FIG. 9) is provided on the right side surface.
U-shaped groove 60 into which the circumferential groove 663 of the head 661 is inserted
7 is provided.

On the right side of the first movable frame 620, FIG.
As shown in (E), a female screw portion 624 having a threaded screw hole 623 is provided. Further, on the left side of the first movable frame 620, as shown in FIG. 11A, two protrusions 626 are provided on the same vertical line. Further, as shown in FIGS. 11A and 11F, two guide grooves 622 are provided. This guide groove 622
Correspond to the two protrusions 606 of the reference frame portion 602 of the reference frame 600 in FIG. Further, as shown in FIG. 11B, a second adjustment screw 67 is provided on the upper surface of the first movable frame 620.
An engagement portion 628 having a U-shaped groove 627 into which a circumferential groove 673 of the head 671 of 0 (center in FIG. 9) is inserted is provided.

On the left side of the second movable frame 640, FIG.
As shown in (A) and (F), guide grooves 642 are provided at two locations arranged on the same vertical line. This guide groove 6
42 are two projections 62 of the first movable frame 620 in FIG.
Corresponds to 6. Also, on the upper surface of the second movable frame 640,
As shown in FIG. 12B, the threaded screw holes 64 are formed.
3 has a female screw portion 644. FIG.
As shown in (A), pressing portions 645 for pressing the first optical element 320 are provided on the light incident surface side at two upper and lower positions on the right side of the second movable frame 640. In addition, a base 646 that supports the first optical element 320 is provided on the lower side. A screw hole 647 is provided at a vertical center position of the left frame of the second movable frame 640.

As shown in FIG. 9, the first optical element 320
Is mounted on the second movable frame 640 so as to be supported by the base 646.
Are fixed to the second movable frame 640 by the holding screws 652 while being pressed by the holding members 650. Therefore, the base part 646, the holding part 645, the holding fitting 650 and the set screw 652 correspond to the fixing member of the present invention. However, a fixing member having any configuration may be used as long as the optical element can be fixed to the second movable frame.

As shown in FIG. 13, the first adjustment screw 660 has an unthreaded head portion 661 and a male screw portion 66.
2, and a circumferential groove 663 is provided on a side surface of the head 661. When mounting the first movable frame 620 on the reference frame 600, first, as shown in FIG. 9, the male screw portion 662 of the first adjustment screw 660 is connected to the female screw of the first movable frame 620. It is screwed into the screw hole 623 of the part 624. The reference frame 6 is inserted into the guide groove 622 of the first movable frame 620.
The projection 606 of the first adjusting screw 660 is inserted into the groove 663 of the head 661 of the first adjusting screw 660 and the U-shaped groove 607 formed in the engaging portion 608 of the reference frame 600.

The second adjusting screw 670 also has a head 671 and a male screw portion 672 similarly to the first adjusting screw 660, and has a circumferential groove 673 on a side surface of the head 671. Is provided. When mounting the second movable frame 640 on the first movable frame 620, first, as shown in FIG.
The male screw portion 672 of the second adjustment screw 670 is screwed into the screw hole 643 of the female screw portion 644 of the second movable frame 640. The protrusion 626 of the first movable frame 620 is fitted into the guide groove 642 of the second movable frame 640, and the groove 673 of the head 671 of the second adjustment screw 670 is inserted into the first movable frame 62.
It is inserted into a U-shaped groove 627 formed in the engagement portion 628 of No. 0.

The reference frame 60 thus assembled
0, the first movable frame 620, and the second movable frame 640,
The three clips 680 having a substantially U-shape are sandwiched at three locations on the left and below and on the lower right. Since the clip 680 is formed of an elastic body, it can be easily attached and detached, and the first optical element 320 can also be easily attached and detached from the position adjustment mechanism 310. This facilitates replacement of the first optical element.

A projection 610 is provided on the left side of the reference frame 602 of the reference frame 600, as shown in FIG. The projection 610 is bent in an L-shape toward the light incident surface slightly to the left of the left end position of the pedestal 604.
Further, the right engaging portion 608 is also bent in an L-shape toward the incident surface on the right side of the right end position of the pedestal portion 604. The width of the projection 610 and the width of the engaging portion 608 on the right side have the same dimensions. A cushion material 6 is provided on the exit surface side of the L-shaped portion of the projection 610 and the engagement portion 608.
90 is pasted. FIG. 14 shows the position adjusting mechanism 310.
Is a top view showing a state in which is attached to the lower light guide 32D. In the position adjusting mechanism 310 on which the first optical element is mounted, the projection 610 and the engaging part 608 of the position adjusting mechanism 310 are inserted into the mounting guide part 34 provided on the lower light guide 32D, and the screw hole 605 is formed. And is fixed by a mounting screw 36 through the intermediary. Also, the position adjustment mechanism 3
Reference numeral 10 denotes a projection 3 provided on the lower light guide 32D.
8 are inserted so as to fit into the guide grooves 609 of the reference frame 600 (FIG. 10). At this time, the position adjusting mechanism 31
0 is pushed by the cushion material 690 so that the protruding portions 610 and the distal end portions of the engaging portions 608 are connected to the optical axis L of the mounting guide portion 34.
It is pressed against a surface 34R perpendicular to C. Thereby, the first optical element 320 mounted on the position adjustment mechanism 310
Are arranged with reference to this surface 34R. Note that the position adjustment mechanism 310, that is, the optical axis L of the first optical element 320
The position along the direction C is the projection 38 with respect to the guide groove 609.
A slight fine adjustment is possible by screwing in such a manner that the position is shifted.

At the position corresponding to the first adjustment screw 660 on the left side wall of the mounting guide portion 34 shown in FIG.
4C is provided. As shown in FIG. 13, the first adjustment screw 660 has an operation groove 664 for rotating operation on the end face of the head 661, and an adjustment jig is provided in the operation groove 664 through the adjustment hole 34C. Insert the first adjustment screw 66
The rotation amount of 0 can be adjusted.

When the first adjustment screw 660 is rotated by the adjustment jig, the first adjustment screw 660 is fitted in the U-shaped groove 607 so as to be freely rotatable. Idles in the U-shaped groove 607. At this time, the screw holes 623 of the first movable frame 620
The first movable frame 620 has a thread cut corresponding to the male screw portion 662 of the first adjustment screw 660.
The first adjustment screw 660 is held movably in the left-right direction with respect to the reference frame 600 in accordance with the rotation of the first adjustment screw 660. Also, since the second adjustment screw 670 is fitted in the U-shaped groove 627 so as to be freely rotatable, the head 67 of the second adjustment screw 670 is
1 idles in the U-shaped groove 627. At this time, the second
The second adjustment screw 67 is provided in the screw hole 643 of the movable frame 640 of FIG.
The second movable frame 640 is vertically movable with respect to the first movable frame 620 in accordance with the rotation of the second adjustment screw 670 because the threading corresponding to the 0 male screw portion 662 is made. Is held. That is, the first adjustment screw 660
By adjusting the screwing amount of the
The position of the first optical element 320 mounted on 0 can be moved in the left-right direction (± x direction). Further, by adjusting the screwing amount of the second adjustment screw 670, the position of the first optical element 320 can be moved in the vertical direction (± y direction).

Accordingly, for example, as shown in FIG. 7B, the illumination area B is shifted laterally with respect to the image forming area A of the liquid crystal light valve 410, so that a part of the image forming area A is not illuminated. In such a case, the position of the illumination area B is shifted laterally by tightening or loosening the first adjustment screw 660 to finely adjust the mounting position of the first optical element 320 to the left or right. As shown in FIG. 7C, the image forming area A can be included in the illumination area B. Also, the illumination area B is the liquid crystal light valve 41
In the case where a part of the image forming area A is not illuminated because it is shifted in the vertical direction with respect to the image forming area A, the second adjustment screw 670 is tightened or loosened to make the first optical By finely adjusting the mounting position of the element 320 up and down,
The position of the illumination area B can be shifted in the vertical direction, so that the image formation area A is included in the illumination area B.

Fine adjustment in the left and right directions (± x direction) can be performed automatically or manually by measuring the illuminance around the image forming area A on the liquid crystal light valve 410G. In the state shown in FIG. 7B, the illumination area B is shifted to the left, and the illuminance at the right corner of the image forming area A on the liquid crystal light valve 410G is low. In order to adjust such a shift of the illumination area B, the mounting position of the first optical element 320 is shifted left and right (± x direction) until the left and right illuminances P1 and P2 of the image forming area A become constant. You just have to shift it. However, since this adjustment method needs to set a constant value in advance, when the light source is changed, it may be necessary to reset a desired constant value accordingly.

Then, the illuminance P on the left and right of the image forming area A is
If the mounting position of the first optical element 320 is shifted to the left or right until the values of P1 and P2 become equal, it is not necessary to set a fixed value in advance. So that the first optical element 3
20 can be easily adjusted. Further, even if the mounting position of the first optical element 320 is shifted left and right until the sum of the left and right illuminances P1 and P2 of the image forming area A becomes maximum, it is not necessary to set a constant value in advance. Therefore, even if the light source is changed, the left and right illuminance P
The mounting position of the first optical element 320 can be easily adjusted so that 1, P2 becomes equal.

The fine adjustment in the left and right directions (± X directions) is performed by using the liquid crystal light valve 410 instead of the method of measuring the illuminance around the image forming area A on the liquid crystal light valve 410G.
G can be performed automatically or manually by measuring the illuminance at the periphery of the projected image when G is made to transmit illumination light and the image is projected on the projection screen 100.

The projection screen 1 in the state shown in FIG.
When the image is projected at 00, the projected image B ′ is not projected at the left corner of the area A ′ where the image should be projected, as shown in FIG. 7D. For this reason, the illuminance at the left corner becomes low. For this reason, it is possible to measure the left and right illuminances Q1 and Q2 of the area A 'where the image is to be projected, and to finely adjust the illuminance by the same method as the fine adjustment by the illuminance measurement on the liquid crystal light valve 410G. it can. That is,
The first optical element 3 until the illuminances Q1 and Q2 reach a constant value.
20 can be shifted to the left or right, and the illuminance Q1, Q2
The mounting position of the first optical element 320 may be shifted to the left or right until the values become equal, or the mounting position of the first optical element 320 may be shifted to the left or right until the sum of the illuminances Q1 and Q2 is maximized. As described above, the illuminance Q1,
If the mounting position of the first optical element 320 is shifted left and right until Q2 becomes equal or the sum of the illuminances Q1 and Q2 is maximized, the left and right illuminances Q1 and Q2 are equal even when the light source is changed. So that the first optical element 32
0 can be easily adjusted.

Fine adjustment in the vertical direction (± Y direction) can also be performed automatically or manually by measuring the illuminance above and below the image forming area A or the illuminance above and below the projected image. In the case of vertical adjustment, similarly to the case of fine adjustment of the left and right, the mounting position of the first optical element 320 in the vertical direction may be shifted until the illuminance at two locations becomes a constant value. Further, the first optical element 320 is used until the illuminances at the two locations become equal or the sum of the illuminances at the two locations becomes maximum.
If the mounting position is shifted up and down, the first illuminance can be equalized even when the light source is changed.
Of the optical element 320 can easily be adjusted.

The position of the integrator optical system 300 may be finely adjusted with reference to the other liquid crystal light valves 410R and 410B instead of the liquid crystal light valve 410G.

As described above, the integrator optical system 300
By setting the mounting position of the first optical element 320 to be finely adjustable, a wide margin is set around the image forming area A of the liquid crystal light valve in consideration of the shift of the illumination area in advance as in the related art. You don't have to. Therefore, the margin to be formed around the image forming area A is extremely small, so that the utilization efficiency of the illumination light can be increased and the brightness of the projected image can be increased.

That is, even if the margin is reduced, the first
By finely adjusting the mounting position of the optical element 320,
As shown in FIG. 7B, the situation where a part of the image forming area A deviates from the illumination area B can be solved. Therefore, there is no adverse effect such as a shadow formed on the edge of the projected image.

The present invention is not limited to the above examples and embodiments, but can be implemented in various modes without departing from the scope of the invention.
For example, the following modifications are possible.

(1) In the above embodiment, the first optical element 3
Although the case where 20 is mounted on the position adjusting mechanism 310 is described as an example, other components constituting the integrator optical system 300 may be mounted on the position adjusting mechanism so that the position can be finely adjusted. That is, the second optical element 330 and the superimposing lens 370 may be mounted on the position adjustment mechanism so that the position can be finely adjusted. Further, the second optical element and the superimposing lens 370 may be mounted on one position adjustment mechanism so that the superimposing lens 370 moves together with the second optical element 330.

(2) In the above embodiment, the second optical element 3
In the integrator optical system including the polarization conversion element array 360 in 30, an example in which a position adjustment mechanism is applied has been described. However, the present invention can be applied to a case in which this is not included. Further, in this case, the condenser lens 340 and the superimposing lens 370 included in the second optical element 330 can be replaced with one lens array having these functions.

(3) In the above embodiment, the first movable frame 62
The position adjustment mechanism 310 is described as an example in which 0 is movable in the left-right direction with respect to the reference frame 600 and the second movable frame 640 is movable in the up-down direction with respect to the first movable frame 620. And vice versa. That is, the first movable frame may be movable vertically with respect to the reference frame, and the second movable frame may be movable left and right with respect to the first movable frame.

(4) In the above embodiment, the first adjusting screw 6
The circumferential groove 663 of the head 661 of the first frame 60 is fitted into the U-shaped groove 607 of the engaging portion 608 of the reference frame 600 in a freely rotatable state, and the male screw portion 662 of the first adjustment screw 660 is in the first position.
Although it is configured to be screwed into the screw hole 623 of the female screw portion 624 of the movable frame 620, it may be reversed. That is, the circumferential groove of the head of the first adjustment screw is fitted into the engaging portion provided on the first movable frame in a freely rotatable state,
The male screw of the first adjustment screw may be screwed into the female screw of the reference frame. At this time, an operation groove (+,-, hexagonal groove, etc.) for rotating operation may be formed on the end face of the male screw portion. The same configuration can be applied to the second adjusting screw, the first movable frame, and the second movable frame.

(5) In the above embodiment, the case where the position adjusting mechanism is applied to the transmissive projection type display device is described as an example. However, the present invention is also applied to the reflection type projection type display device. Is possible. Here, “transmission type” means that the light modulation means such as a liquid crystal light valve transmits light, and “reflection type” means that the light modulation means reflects light. It means there is. In the reflection type projection display device, the cross dichroic prism is used as color light separating means for separating incident light into red, green, and blue light, and recombines modulated three-color light. It is also used as a color light combining means that emits light in the same direction. Even when the position adjusting mechanism is applied to the reflection type projection display device, almost the same effects as those of the transmission type projection display device can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a configuration of a projection display device incorporating an optical unit of the present invention.

FIG. 2 shows an illumination area 3 of the projection display apparatus shown in FIG.
FIG. 3 is an explanatory diagram illustrating an integrator illumination optical system that illuminates a sheet of liquid crystal light valves.

3A and 3B are a front view and a side view showing an appearance of a first optical element 320. FIG.

FIG. 4 is a perspective view showing an appearance of a polarization conversion element array 361.

FIG. 5 is an explanatory diagram showing functions of a polarization conversion element array 361.

FIG. 6 is a plan view of a light shielding plate 350.

FIG. 7 shows an illumination area B on the liquid crystal light valve 410 by the integrator optical system 300, and the liquid crystal light valve 41.
FIG. 4 is a schematic diagram showing a relationship between the image forming area A and the image forming area A;

FIG. 8 is a perspective view showing an appearance of a position adjustment mechanism 310.

FIG. 9 is an exploded perspective view of the position adjusting mechanism 310.

FIG. 10 is an explanatory diagram showing an appearance of a reference frame 600.

FIG. 11 is an explanatory diagram showing an appearance of a first movable frame 620.

FIG. 12 is an explanatory diagram showing an appearance of a second movable frame 640.

FIG. 13 is an explanatory diagram illustrating an appearance of a first adjustment screw 660.

FIG. 14 shows a position adjusting mechanism 310 for the lower light guide 32.
It is a top view which shows the state attached to D.

FIG. 15 is a schematic configuration diagram of an optical system of a general projection display device including an integrator optical system.

FIG. 16 is an explanatory diagram showing a relationship between an illumination area on a liquid crystal light valve and an image forming area.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Light source unit 30 ... Optical unit 32D ... Lower light guide 32U ... Upper light guide 34 ... Guide part 34C ... Adjustment hole 34R ... Surface 36 ... Screw 38 ... Projection 40 ... Projection lens 100 ... Projection screen 200 ... Light source 202 ... Part Light flux 210 Light source lamp 212 Concave mirror 300 Integrator optical system 310 Position adjusting mechanism 320 First optical element (condenser lens, lens array) 321 Small lens 330 Second optical element 340 Condenser lens 341 ... Small lens 350 ... Light shielding plate 351 ... Aperture 360 ... Polarization conversion element array 361,362 ... Polarization conversion element array 363 ... Polarization beam splitter array 364 ... λ / 2 phase difference plate 365 ... Translucent member 366 ... Polarization separation film 367: reflective film 368: polarization conversion element 370: superimposed lens 3 2 Reflecting mirror 380 Color light separation optical system 382 First dichroic mirror 384 Reflecting mirror 386 Second dichroic mirror 390 Light guiding optical system 392 Incident lens 394, 398 Reflecting mirror 396 Relay lens 400 , 402, 404 Field lens 410 Liquid crystal light valve (illumination area) 410R, 410G, 410B Liquid crystal light valve 420 Cross dichroic prism 600 Reference frame 602 Reference frame 604 Base portion 605 Screw hole 606 Projection 607 U-groove 608 Engagement part 609 Guide groove 610 Projection 620 First movable frame 622 Guide groove 623 Screw hole 624 Female screw part 626 Projection 627 U-shaped groove 628 Engagement Part 640: second movable frame 642: guide groove 643: screw hole 64 ... female screw part 645 ... holding part 646 ... base part 647 ... screw fixing hole 650 ... holding metal fitting 652 ... set screw 660 ... first adjusting screw 661 ... head 662 ... male screw part 663 ... groove 664 ... operation groove 670 ... Second adjustment screw 671 Head 672 Male screw portion 673 Groove 680 Clip 690 Cushion material 920 Light source lamp unit 921 First lens array 921a Lens 922 Second lens array 922a Lens 923 … Integrator optical system 925… Liquid crystal light valve

Claims (4)

[Claims] 1. A projection display device for projecting an image on a projection surface, comprising: a light source; a light modulation unit configured to modulate a light beam emitted from the light source according to a given image signal; A projection optical system for projecting an image formed by the modulated light emitted from the means on the projection surface, provided on an optical path between the light source and the light modulation means,
First having a plurality of small lenses arranged in a matrix
A first direction orthogonal to an optical axis of the projection display device, and the optical axis of at least one of the first and second lens arrays. And a position adjustment mechanism capable of adjusting the installation position thereof in a second direction orthogonal to the first direction. The position adjustment mechanism is supported by the support and movably held by the support. A first movable body, and a second movable body movably held by the first movable body.
The first movable body is provided with a first position adjusting member for adjusting a position of the first movable body with respect to the support along the first direction. The second movable body is the second movable body with respect to the first movable body.
And a fixing member for detachably fixing the lens array to the second movable body. 2. A projection display device for projecting an image on a projection surface, comprising: a light source; a first optical element that divides a light beam from the light source into a plurality of partial light beams; Located near the position, the first
A condenser lens array for condensing a plurality of partial light beams divided by the optical element, and converting each of the partial light beams condensed by the condenser lens array from non-polarized light to almost one type of linearly polarized light A second optical element having: a polarization converter that converts the light into a light beam; a third optical element that superimposes a plurality of partial light beams emitted from the second optical element; and a third optical element. A light modulating unit that modulates a light beam emitted from the light source according to a given image signal; and a projection optical system that projects an image formed by the modulated light beam emitted from the light modulating unit onto the projection surface. At least one of the first to third optical elements has a first direction orthogonal to the optical axis of the projection display device and a second direction orthogonal to the optical axis and the first direction. Direction and that A position adjusting mechanism that can adjust a set position, wherein the position adjusting mechanism moves to the first movable body, a first movable body movably held by the support, and the first movable body. Possible retained second
The first movable body includes a first position adjusting member for adjusting a position of the first movable body with respect to the support along the first direction. A second position adjusting member for adjusting a position of the second movable body with respect to the first movable body along the second direction; and a second movable body. A projection display device, comprising: a fixing member for fixing the optical element to a body. 3. The projection display device according to claim 2, wherein the third optical element is fixed to the second movable body so as to move together with the second optical element. Type display device. 4. The projection type display device according to claim 1, wherein the first position adjusting member has a first male screw portion and a circumferential groove. A first circumferential groove provided at one end of the first male thread, and a rotating operation provided at least one of an end face of the first male thread and an end face of the first circumferential groove. A first operation groove, wherein the first circumferential groove portion is fitted into one of the support member and the first movable member in a freely rotatable state, and The second position adjustment member has a second male screw portion and a circumferential groove, and is provided at one end of the second male screw portion. A second peripheral groove, at least one of an end surface of the second external thread and an end surface of the second peripheral groove; And a second operation groove for rotational operation provided on the first and second movable members. The second circumferential groove portion is fitted into one of the first and second movable bodies in a freely rotatable state. And a projection type display device in which the second male screw portion is screwed into a female screw portion provided on the other side.