JP2003057651A - Mirror adjustment mechanism of liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen an inclination adjustment range and to simplify the adjustment. SOLUTION: A full reflection mirror 12 is supported at three places in total which are at almost the center of a lower part of the full reflection mirror 12 and the left and right parts of an upper part of the full reflection mirror 12 by making the outer circumferential surfaces of disks of eccentric screws 24a and 25a provided eccentrically with the disks 24b and 25b at a point part that is screwed into each screw hole 23b provided on the bottom and top surfaces of a mirror holding frame 23 abut on one side surface of the full reflection mirror 12 with a line. Then, by turning the eccentric screws 24a and 25a, the full reflection mirror 12, on the other side surface of which one end sides of springs 26 and 27, the other end sides of which are fixed to the mirror holding frame 23, are allowed to be abut is moved in each supporting place back and forth in the direction an optical axis Lo.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mirror adjusting mechanism for accurately guiding a light beam from a light source to a liquid crystal panel using a mirror in a liquid crystal projector.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a configuration of a liquid crystal projector. Conventionally, for example, as shown in Japanese Patent Application Laid-Open No. 11-101965, and as shown in FIG. 3, a liquid crystal projector includes a light emitter 1 that emits white light and a parabolic surface that reflects white light from the light emitter 1. Reflector 2 formed of a mirror, integrator 3 for equalizing the amount of light with respect to white light emitted from light-emitting body 1 in a cross section perpendicular to the optical axis, and condensing output light from integrator 3. A condenser lens 4, a first dichroic mirror 5 and a second dichroic mirror 6 for separating the white light condensed by the condenser lens 4 into three color component lights of blue, green, and red; A first liquid crystal panel 7 and a second liquid crystal panel which respectively modulate the respective color component lights separated by the first dichroic mirror 5 and the second dichroic mirror 6 in accordance with predetermined image information. , And the third liquid crystal panel 9,
A three-color synthesizing prism 10 for synthesizing each color component light modulated by each liquid crystal panel 7, 8, 9 and a projection lens 11 for forming an image of the synthesized light synthesized by the three-color synthesizing prism 10 on a screen. It has and.

Further, as shown in FIG. 3, a total reflection mirror 12 for reflecting the output light from the integrator 3 and guiding it to the condenser lens 4 is arranged on the optical path between the integrator 3 and the condenser lens 4. It is set up. The reflector 2 formed of the parabolic mirror has a light emitting source of the light emitting body 1 as a focal position, and a part of a light flux emitted from the light emitting body 1 toward the rear and outside of the optical axis Lo of the white light. Is reflected as a light beam substantially parallel to the optical axis Lo.

The integrator 3 separates the second fly-eye 3A acting on the luminous flux from the light-emitting body 1 and the luminous flux from the second fly-eye 3A into color component light, and then on the respective liquid crystal panels 7, 8 and 9. And a first fly eye 3B to be superposed on. Further, on the rear side of the optical axis of the first fly's eye 3B, after separating the light beam homogenized by the integrator 3 into P-polarized light and S-polarized light, both polarized lights are aligned to one polarized light and both are collimated light. The PBS 13 is provided for the purpose of preventing the decrease of the light amount.

[0007] The first dichroic mirror 5 and the second dichroic mirror 6 may be separated from each other by changing the incident direction of the luminous flux and the position where the mirrors are arranged. , For example,
The color component light is separated according to the following modes. That is, in the first dichroic mirror 5, the B component LB is separated from the light flux which is homogenized by the integrator 3 and is polarized by the PBS 13. In the second dichroic mirror 6, the G component LG is separated from the light flux transmitted through the first dichroic mirror 5, and the R component LR is separated.
Through.

The respective color component lights thus separated are
The liquid crystal panels 7, 8 and 9 for the corresponding color component lights are projected. That is, as shown in FIG. 3, the B component L reflected by the first dichroic mirror 5 and separated.
On the B optical path, a first mirror 14 for totally reflecting the B component LB toward the first liquid crystal panel 7 displaying an image for the B component, and a B component L reflected by the first mirror 14.
A field lens 15 for collimating B is provided, and the B component LB is projected on the first liquid crystal panel 7.

Further, as shown in FIG. 3, a field lens 16 for converting the G component LG into parallel light is disposed on the optical path of the G component LG reflected and separated by the second dichroic mirror 6. The G component LG is projected on the second liquid crystal panel 8 on which an image for the G component is displayed.

Further, as shown in FIG. 3, a third liquid crystal on which an image for the R component LR is displayed on the optical path of the R component LR separated by passing through the second dichroic mirror 6. A second mirror 17 and a third mirror 18 for total reflection toward the panel 9 and field lenses 19, 20 for converting the R component LR separated by the second dichroic mirror 6 into parallel light are arranged. However, the R component LR is projected on the third liquid crystal panel 9.

In the projection optical system, the optical path length up to the three-color combining prism 10 is different only in the R component LR, but a relay lens 21 is provided between the second mirror 17 and the third mirror 18. This relay lens 21 allows the optical path length of the R component LR to be adjusted to the B components LB and G.
The correction is made so as to be apparently equivalent to the optical path length of the component LG.

The three-color synthesizing prism 10 is a cross prism and has a dichroic surface 10B that reflects the B component LB and a dichroic surface 10R that reflects the R component LR. On the total reflection mirror 12, the first mirror 14, the second mirror 17, and the third mirror 18, the projection range of the light flux reflected by each of the mirrors 12, 14, 17, 18 is set to each of the liquid crystal panels 7, 8, Each mirror 12, 14, 1 so that it can be moved with respect to 9
An inclination adjusting mechanism is provided to incline 7 and 18 with respect to a plane perpendicular to the optical axis.

FIG. 4 is a diagram showing an example of a mirror adjusting mechanism of a conventional liquid crystal projector, which is a side perspective view (a) of a main part, a front view (b) taken along arrow A and a plane taken along arrow B. It is a perspective view (C). An example of this mirror adjusting mechanism will be described with reference to the drawings. The total reflection mirror 12 will be described as an example of the mirror, but the first to third mirrors 14,
The inclinations of 17 and 18 can be adjusted with the same configuration.

As shown in FIG. 4, the tilt adjusting mechanism is provided on a mirror holding frame 23 that holds the total reflection mirror 12, and a lower support member 24 that supports the lower center of the total reflection mirror 12 at substantially the center thereof. A pair of left and right upper support members 25 that respectively support the left and right upper portions of the total reflection mirror 12, springs 26 and two springs 27 that press the total reflection mirror 12 toward the support members 24, 25, respectively. Is equipped with.

The lower support member 24 is a mirror holding frame 2.
3 is a columnar member protruding upward from the lower surface of the reference numeral 3, and the outer peripheral surface abuts one side surface of the total reflection mirror 12 with a line to support the lower center of the total reflection mirror 12. . Further, the other side of the spring 26 whose one end is fixed to the mirror holding frame 23 is in contact with the other side surface of the total reflection mirror 12 with which the lower support member 24 is in contact. It is pressed against the lower support member 24.

Each of the upper support members 25 is an eccentric screw 25a having an eccentric disc 25b at its tip end screwed into a screw hole provided on the upper surface of the mirror holding frame 23, and the outer peripheral surface of the disc 25b. Is in line contact with one side surface of the total reflection mirror 12 to support the upper right and left of the upper portion of the total reflection mirror 12. Therefore, by rotating the eccentric screw 25a, the radius of the center of rotation is decentered and the radius to the abutting side surface changes, so that the position of the total reflection mirror 12 moves back and forth in the optical axis Lo direction according to the movement. Change. In addition, the total reflection mirror 1 with which the upper support member 25 abuts
The other side of the pair of springs 27, one end of which is fixed to the holding frame 23, is in contact with the other side surface of the second frame 2, and the total reflection mirror 12 is constantly pressed against the upper support member 25 by the spring 27.

By the way, in order to increase the illumination efficiency on the screen as much as possible, the size and position of the illumination area with respect to the liquid crystal panel need to be substantially aligned with the size and position of the liquid crystal panel.
The inclinations of 17 and 18 will be adjusted. In the example shown in FIG. 4, two eccentric screws 25 a that come into contact with the total reflection mirror 12 are provided.
By rotating each of them independently, the two contact positions are separately moved back and forth in the optical axis Lo direction, and the tilt of the total reflection mirror 12 itself can be adjusted. However, in the above configuration, the tilt adjustment is performed according to the position change of only the upper support member 25, and the lower support member 24 has a structure that does not move.
There was a problem that adjustment was difficult because the adjustment range was small and there were two adjustment points. Therefore, there is a demand for a technology that allows a large tilt adjustment range and allows easy adjustment.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a mirror adjusting mechanism for a liquid crystal projector which has a large tilt adjusting range and can be easily adjusted.

[0017]

In order to solve the above problems, the present invention has the following means.

A light source section for emitting white light, an integrator section for equalizing the light quantity of the white light emitted from the light source section in a cross section perpendicular to the optical axis, and output light from the integrator section. A light condensing unit configured to condense at least one condenser lens, a color light separating unit that separates white light transmitted through the light condensing unit into three color component lights of blue, green, and red, and the color light. A liquid crystal panel that modulates each color component light separated by the separation unit in accordance with predetermined image information, a color light combining unit that combines each color component light modulated by the liquid crystal panel, and a color light combining unit At least one mirror is disposed on the optical path between the projection unit that projects the combined light and the light source unit and the color light combining unit, and the projection range of the reflected light reflected by the mirror is the liquid crystal panel. Against In the liquid crystal projector comprising a tilt adjusting mechanism for adjusting the mirror so as to allow to tilt with respect to the optical axis, the tilt adjustment mechanism,
The adjusting unit is composed of three adjusting units that support the mirror and can move back and forth independently in the optical axis direction.

Further, an eccentric screw formed by screwing the adjusting portion into a screw hole provided in a frame body for holding the mirror and providing an eccentric disc at the tip end thereof, the disc being in contact with the mirror, and the mirror. And a spring which is fixed to one side of the frame and holds the other side of the mirror.

Further, an adjusting screw formed by screwing the adjusting portion into a screw hole provided in a frame body for holding the mirror and providing a substantially conical body at the tip end thereof, and a generatrix of the conical body being in contact with the mirror. One end side is fixed to a frame body that holds the mirror and a spring is in contact with the other side surface of the mirror.

Further, the adjusting portion is inserted into an insertion hole provided in a frame body for holding the mirror, and a wedge whose slant surface is in contact with the mirror, and one end side of which is fixed to the frame body for holding the mirror, It is composed of a spring that is in contact with the other side surface of the mirror.

An elastic member is arranged around the insertion hole.

Further, the adjusting portion is screwed into a screw hole provided in the frame body holding the mirror in parallel with the optical axis, and the tip is brought into contact with the mirror, and the adjusting frame is attached to the frame body holding the mirror. One end is fixed and a spring is in contact with the other side surface of the mirror.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION A mirror adjusting mechanism of a liquid crystal projector according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a mirror adjusting mechanism of a liquid crystal projector according to the present invention, which is a side perspective view (a) of a main part, a front view (b) based on an arrow A and a plane based on an arrow B. It is a perspective view (C). An embodiment of this mirror adjusting mechanism will be described with reference to FIGS. 1, 3 and 4. still,
The same parts as those in the example of the mirror adjusting mechanism of the conventional liquid crystal projector shown in FIGS. 3 and 4 are designated by the same reference numerals, and the duplicated description will be omitted. Further, the total reflection mirror 12 will be described as an example of the mirror, but the first to third mirrors 14, 17, 18 are used.
Also in the above, the inclination can be adjusted by the same configuration.

As shown in FIG. 1, the present invention comprises an inclination adjusting mechanism for the total reflection mirror 12 including three adjusting portions S1, S2, S3 which are movable back and forth in the optical axis Lo direction of the total reflection mirror 12. And The frame body of FIG. 1, that is, the mirror holding frame 2
3 (hereinafter, the frame body is referred to as a mirror holding frame), an eccentric screw 24a provided with a disk 24b in an eccentric state at a tip end screwed into a screw hole 23b provided in the center of the lower surface, and the left and right ends of the upper surface. It is provided with two eccentric screws 25a provided with a disk 25b in an eccentric state at the tip end portion screwed into the screw hole 23b.

The outer peripheral surfaces of these three disks 24b and 25b are brought into line contact with one side surface of the total reflection mirror 12, so that substantially the center of the lower portion of the total reflection mirror 12 and the right side of the upper portion thereof.
A spring 26 having one end fixed to the mirror holding frame 23 and two springs 2 on the other side while pressing the left three positions.
Since the other end side of 7 abuts against and presses the substantially opposite side of the above three places, these eccentric screws 24a, 25a and springs 26, 27
The total reflection mirror 12 is sandwiched by the three adjusting sections S1, S2, and S3.

Therefore, these three eccentric screws 24a, 2
By rotating 5a, the radius to the abutting one side surface changes due to the eccentricity of the rotation center, so that the position of the total reflection mirror 12 changes the position of the three adjusting portions S1, S2, S3 according to the movement. Each time, it changes back and forth in the optical axis Lo direction. As described above, according to the present invention, since the adjusting portion S1 whose position can be changed back and forth is also provided in the center of the lower portion as compared with the conventional technique, the tilt adjustment range can be increased and the adjustment can be facilitated as compared with the conventional technique.

FIG. 2 is a view showing the second, third and fourth embodiments of the mirror adjusting mechanism of the liquid crystal projector according to the present invention, and is a side perspective view (a) of the main part of the second embodiment and the third embodiment. It is a principal part side transparent view (b) of an Example, and the principal part side transparent view (c) of a 4th Example. Incidentally, the same parts as those of the embodiment of the mirror adjusting mechanism of the liquid crystal projector shown in FIG.

A description will be given with reference to FIG. A total of three screw holes 23b are provided in the lower center of the mirror holding frame 23 that holds the total reflection mirror 12, and in the upper and left ends.
Adjustment screws 24d and 2 which are screwed to each other and each of which has a substantially conical body 24c and two substantially conical bodies 25c, and the generatrixes of these three conical bodies are in contact with the total reflection mirror 12.
One adjusting screw 25d, a spring 26 that has one end fixed to the mirror holding frame 23 that holds the total reflection mirror 12, and is in contact with the other side surface of the total reflection mirror 12, and two springs 27.
It consists of and.

By rotating the adjusting screw 24d and the screw heads of the two adjusting screws 25d with a screwdriver or the like respectively, the adjusting screw 24d and the two adjusting screws 25d are screwed through the screw holes 23b. Move forward or backward.
As a result, the adjusting screw 24d and the two adjusting screws 25d
The three conical bodies 24c and 25c provided at the respective tips of the above move vertically. Then, the three contact positions of the generatrixes of the conical bodies 24c and 25c with respect to the total reflection mirror 12 change back and forth in the optical axis Lo direction, so that the other surface of the spring 2
The total reflection mirror 12 supported by 6, 27 is
Each contact position changes back and forth in the optical axis Lo direction. Therefore, the tilt of the total reflection mirror 12 can be adjusted. Particularly, in this embodiment, since the positional changes of the conical bodies 24c and 25c per screw rotation are slight, a slight tilt adjustment can be easily performed.

A description will be given with reference to FIG. A total of three substantially rectangular insertion holes 23c are provided in the lower center of the mirror holding frame 23 that holds the total reflection mirror 12 and in the upper and left end portions of the mirror holding frame 23. 24e and two wedges 25 that are in contact with
e, a mirror holding frame 2 for holding the total reflection mirror 12
3 is composed of a spring 26 and two springs 27, one end of which is fixed to the total reflection mirror 3 and which abuts on the other side surface of the total reflection mirror 12.

By inserting the wedge 24e and the two wedges 25e into the insertion hole 23c, respectively, the wedge 2 can be adjusted according to the degree of insertion.
The slopes of 4e and the two wedges 25e move in parallel, and the position where this slope contacts the total reflection mirror 12 changes back and forth in the optical axis Lo direction. Therefore, the inclination of the total reflection mirror 12 changes in accordance with each position change. Can be adjusted.

In order to fix the insertion positions of the wedges 24e and the two wedges 25e after the insertion, the adhesive member 30 having a large viscosity and a high curing speed is attached and fixedly held around the three insertion holes 23c and the wedges. The elastic member 2 is provided around the insertion hole 23c.
9, and each wedge 24e and two wedges 25e are inserted into the insertion hole 2
The fixing positions may be temporarily stabilized and easily adjusted when they are inserted into the respective 3c.

A description will be given with reference to FIG. The mirror holding frame 23 for holding the total reflection mirror 12 is screwed into a total of three screw holes 23b provided substantially parallel to the optical axis Lo at the center of the lower portion of the side surface and the left and right end portions of the upper portion of the side surface. Adjusting screw 2 which comes into contact with one side of 12 almost vertically
4f and two adjusting screws 25f, and the total reflection mirror 1
It is composed of a spring 26a and two springs 27a, one end of which is fixed to a mirror holding frame 23 which holds 2 and which is in contact with the other side surface of the total reflection mirror 12.

Adjusting screw 24f and two adjusting screws 25f
By rotating each of them, the adjusting screw 24f and the two adjusting screws 25f are moved forward or backward through the screw holes 23b that are screwed together, and the other surface is a total reflection mirror supported by the springs 26a and 27a. 12 can be moved forward and backward in the direction of the optical axis Lo for every three contact positions by the tip of the screw. Therefore, the tilt of the total reflection mirror 12 can be easily adjusted by adjusting each of the three contact positions independently.

[0036]

As described above, according to the present invention,
(EN) Provided is a mirror adjustment mechanism for a liquid crystal projector which has a wide tilt adjustment range and is easy to adjust. In the present invention, the tilt adjusting mechanism of the total reflection mirror is provided with three adjusting portions that can be moved back and forth in the optical axis Lo direction of the total reflection mirror. The lower support member that supports almost the center of the lower part of the mirror is configured so that it can be adjusted in the same manner as the adjustment part of the upper part, and the number of adjustment parts is increased to three, increasing the adjustment range and simplifying the adjustment. I realized the adjustment.

In addition, the second and fourth embodiments have the above-mentioned features, and fine adjustment can be easily performed. Further, the third embodiment has a simple structure with a wedge and an insertion hole and is inexpensive.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a mirror adjustment mechanism of a liquid crystal projector according to the present invention, which is a side perspective view (a) of a main part, a front view (b) based on an arrow A and a plane based on an arrow B. It is a perspective view (C).

FIG. 2 is a diagram showing second, third, and fourth embodiments of the mirror adjusting mechanism of the liquid crystal projector according to the present invention, and is a side perspective view (a) of a main part of the second embodiment, and FIG. Perspective side perspective view (b) and side perspective view (c) of the fourth embodiment
Is.

FIG. 3 is a diagram showing a configuration of a liquid crystal projector.

4A and 4B are diagrams showing an example of a mirror adjusting mechanism of a conventional liquid crystal projector, showing a side perspective view (A) of a main part, a front view (B) based on an arrow A and a plan perspective view based on an arrow B ( C)

[Explanation of symbols]

1 luminous body 2 reflector 3 integrator 3A Second fly eye 3B First fly eye 4 condenser lens 5 First dichroic mirror 6 Second dichroic mirror 7 First liquid crystal panel 8 Second liquid crystal panel 9 Third liquid crystal panel 10 3 color composite prism 11 Projection lens 12 total reflection mirror 13 PBS 14 First mirror 15, 16 field lens 17 Second mirror 18 third mirror 19, 20 field lens 21 relay lens 23 Mirror holding frame (frame body) 23b screw hole 23c insertion hole 24 Lower support member 24a, 25a eccentric screw 24b, 25b disc 24c, 25c cone 24d, 24f, 25d, 25f Adjustment screw 24e, 25e wedge 25 Upper support member 26, 27 springs 29 Elastic member 30 Adhesive member Lo optical axis

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 9/31 H04N 9/31 C

Claims (6)

[Claims] 1. A light source unit that emits white light, an integrator unit that equalizes the amount of white light emitted from the light source unit in a cross section perpendicular to the optical axis, and an integrator unit that outputs light from the integrator unit. A light condensing part formed of at least one condenser lens for condensing the output light, and a color light separating part separating the white light transmitted through the light condensing part into three color component lights of blue, green and red. A liquid crystal panel that modulates each color component light separated by the color light separation unit in accordance with predetermined image information, a color light combining unit that combines each color component light modulated by the liquid crystal panel, and a combination by the color light combining unit At least one mirror is disposed on the optical path between the projection unit that projects the combined light and the light source unit and the color light combining unit, and the projection range of the reflected light reflected by the mirror is Move to LCD panel A liquid crystal projector comprising a tilt adjusting mechanism that adjusts the mirror so that the mirror is movable so as to tilt with respect to the optical axis. A mirror adjusting mechanism for a liquid crystal projector, which is composed of three adjusting portions that can move back and forth in the axial direction. 2. An eccentric screw in which the adjusting portion is screwed into a screw hole provided in a frame for holding a mirror, and a disk is provided at an end portion in an eccentric state, and the disk is in contact with the mirror, and the mirror. 2. A mirror adjusting mechanism for a liquid crystal projector according to claim 1, wherein the mirror adjusting mechanism is configured by a spring having one end fixed to a frame body holding said and abutting against the other side surface of said mirror. 3. An adjusting screw, wherein the adjusting portion is screwed into a screw hole provided in a frame holding a mirror, and a substantially conical body is provided at a tip portion thereof, and a generatrix of the conical body is in contact with the mirror. 2. The mirror adjusting mechanism for a liquid crystal projector according to claim 1, wherein one end side is fixed to a frame body holding the mirror and a spring is in contact with the other side surface of the mirror. 4. The wedge, which is formed by inserting the adjusting section into an insertion hole provided in a frame body for holding a mirror, and an inclined surface of which is in contact with the mirror, and one end side of which is fixed to the frame body for holding the mirror. The mirror adjusting mechanism for a liquid crystal projector according to claim 1, wherein the mirror adjusting mechanism comprises a spring that is in contact with the other side surface of the mirror. 5. The mirror adjusting mechanism for a liquid crystal projector according to claim 4, wherein an elastic member is arranged around the insertion hole. 6. A screw for screwing the adjusting portion into a screw hole provided in a frame body for holding the mirror in parallel with the optical axis so that a tip end thereof is in contact with the mirror, and a frame body for holding the mirror. 2. The mirror adjusting mechanism for a liquid crystal projector according to claim 1, wherein the mirror adjusting mechanism comprises a spring having one end fixed and abutting against the other side surface of the mirror.