JP2001201792A - Projection type picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the attaching position, angle and tilt of an optical member such as an integrator lens. SOLUTION: In an integrator part consisting of a 1st integrator lens 2 constituted by collecting many microlenses and arranged just behind a light source and a 2nd integrator 3 arranged at the condensing point position of the lens 2, either one both of the lenses 2 and 3 are provided with adjusting means 4 and 5 having a rotational angle adjusting mechanism capable of adjusting deviation in mutually rotating directions with respect to a plane perpendicular to the optical axis of incident luminous flux.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type image display device, and more particularly to a projection type image display device having a lens adjusting means for an integrator lens in which a large number of microlenses are assembled.

[0002]

2. Description of the Related Art The prior art will be described with reference to the configuration diagram of an optical system of a projection type image display device shown in FIG. A light beam from a light source LA such as a metal halide lamp is imaged on a second integrator lens 3 by a first integrator lens 2 using an integrator lens for assembling a large number of microlenses and ensuring uniform brightness. The light emitted from the second integrator lens 3 is diffracted by 90 ° by the first total reflection mirror MR1 via the first condenser lens LN1, and is separated by the first dichroic mirror RF1 that transmits B light and reflects R and G light. Is done. The B light separated and passed is diffracted by 90 ° by the fourth total reflection mirror MR4, and is condensed by the second condenser lens LN2b on the incident light surface of the B color LCD. The separated R and G light transmits the R light and
The light is split by the second dichroic mirror RF2 that reflects light. The G light separated and reflected is the second condenser lens LN
At 2 g, the light is focused on the incident light surface of the G-color LCD. The separated and passed R light is diffracted by 180 ° by the second total reflection mirror MR2 and the third total reflection mirror MR3, and is condensed on the incident light surface of the R color LCD by the second condenser lens LN2r having a different focal length. The LCD LCDr, LCDg, and LCDb for each color light-modulate with an image signal. The light-modulated RGB light is synthesized by a dichroic prism DR or the like, and is enlarged and projected as an image on a screen S by a projection optical system LN5.

Further, the first integrator lens 2
It is necessary to accurately form an image of the light beam from the light source LA on the second integrator lens 3. However, the displacement of the arc portion of the light source, the displacement of the entire light source, the light source LA, the first integrator lens 2 and the second integrator lens 3
When deviations such as manufacturing variations, relative positional deviations, and rotation direction inclinations occur, the amount of light emitted from the second integrator lens decreases, and the brightness is reduced by 20 to 40% on the LCD. appear. In order to solve this problem, the mounting positions of the integrator lenses 2 and 3 as shown in FIG.
A method of relative adjustment in the (longitudinal) direction has been proposed. FIG.
For example, the first integrator lens 2 has a frame member 4 around its periphery.
The integrator lens 2 is urged by an elastic member 40 formed of a leaf spring, a wire spring, a coil spring, or the like at the right end and the lower end. Further, an adjustment screw 41 is provided at a position facing the elastic member 40, and the left adjustment screw 41 is provided.
And the position in the X direction is adjusted by the upper adjustment screw 41 so that the optical axis is adjusted. However, this method has not solved the problem of a shift in rotation, inclination, and the like due to a shift in the relative position of the optical system members originally possessed. As the brightness of the screen has been further improved and the overall apparatus has become more sophisticated, a slight shift affects the unevenness of the screen, the brightness difference, and the brightness reduction. Therefore, it is desired to improve these fine-grained adjustment methods.

[0004]

SUMMARY OF THE INVENTION In view of the above-described problems, the present invention provides a method for adjusting the mounting position, angle, and inclination of an optical member such as an integrator lens in response to manufacturing variations and adjustment variations of optical system members. It is an object of the present invention to provide a projection type image display device having a means for adjusting.

[0005]

According to the present invention, in order to solve the above-mentioned problems, an incident light beam from a light source is evenly condensed by an integrator unit, reflected by a total reflection mirror, and R (red) G
(Green) Separates light with a dichroic mirror having spectral characteristics such as B (blue), and modulates light with image signals by light valve control means such as an LCD (liquid crystal display panel) for each color.
A projection-type image display device that combines each light-modulated color with a dichroic prism or the like and enlarges and projects an image on a screen with a projection optical system, wherein the integrator unit is a group of a large number of microlenses, immediately after the light source. The first integrator lens and the second integrator lens disposed at the focal point position of the first integrator lens, one of the first integrator lens and the second integrator lens, or both And an adjusting means having a rotation angle adjusting mechanism capable of adjusting a mutual shift of a rotational direction of the incident light beam with respect to a plane perpendicular to the optical axis.

In addition, an incident light beam from a light source is evenly condensed by an integrator and reflected by a total reflection mirror.
The light is separated by a dichroic mirror having spectral characteristics such as (red) G (green) and B (blue), and light is modulated by an image signal by a light valve control unit such as an LCD (liquid crystal display panel) for each color, and each light is modulated. Is synthesized by a dichroic prism or the like, and a projection type image display device for enlarging and projecting an image on a screen by a projection optical system, wherein the integrator unit includes a number of microlenses, and is arranged immediately after the light source. One integrator lens, and a second integrator lens disposed at the focal point position of the first integrator lens, the incident light flux to one or both of the first integrator lens and the second integrator lens And an adjusting means having an inclination adjusting mechanism capable of adjusting a deviation in a vertical direction with respect to a plane perpendicular to the optical axis.

In addition, an incident light beam from a light source is evenly condensed by an integrator and reflected by a total reflection mirror.
The light is separated by a dichroic mirror having spectral characteristics such as (red) G (green) and B (blue), and light is modulated by an image signal by a light valve control unit such as an LCD (liquid crystal display panel) for each color, and each light is modulated. Is synthesized by a dichroic prism or the like, and a projection type image display device for enlarging and projecting an image on a screen by a projection optical system, wherein the integrator unit includes a number of microlenses, and is arranged immediately after the light source. One integrator lens and a second integrator lens arranged at the focal point of the first integrator lens, and one or both of the first and second integrator lenses are located in front of and behind each other. Adjustment means having a front-back direction position adjustment mechanism capable of adjusting the position shift in the direction is provided.

The adjusting means has an adjusting mechanism for adjusting the first integrator lens in the X or Y direction and adjusting the second integrator lens in the Y or X direction.

The first integrator lens and / or the second integrator lens are fixed to a holding frame having an arc-shaped bottom surface, and the bottom surface is rotatably engaged with a base having an arc-shaped upper surface. The rotation angle adjusting mechanism is formed by the holding frame, the base, and a long hole formed in the base and extending in the rotation direction about the optical axis along a plane perpendicular to the optical axis of the incident light beam. And a fixing screw to be inserted through the elongated hole.

Further, the rotation angle adjusting mechanism is constituted by an arc-shaped gear portion formed on a side surface of the holding frame, and a gear formed on the base.

Further, the rotation angle adjusting mechanism includes an arc-shaped gear portion formed on a side surface of the holding frame, and a worm gear formed on the base.

Further, the rotation angle adjusting mechanism is constituted by a belt fixed on the upper and lower sides of the holding frame and a pulley formed on the base.

Further, the first integrator lens and / or the second integrator lens are fixed to a holding frame, and the first integrator lens and / or the first integrator lens are mounted on one of left and right ends and one of upper and lower ends of the holding frame. An elastic member for biasing the second integrator lens is provided, and the rotation angle adjusting mechanism is provided on one surface of the elastic member and the holding frame facing the elastic member. It consists of a screw and two adjustment screws provided on the other surface.

Further, the rotation angle adjusting mechanism is constituted by the elastic member and two adjusting screws provided on respective surfaces of the holding frame facing the elastic member.

Further, the tilt adjusting mechanism is disposed behind the first integrator lens and / or the second integrator lens, and one end of the first integrator lens and / or the second integrator lens is positioned forward. It comprises a second elastic member for biasing, and a cam mechanism provided on a surface facing the second elastic member in front of the first integrator lens and / or the second integrator lens.

The cam mechanism may further comprise a cylindrical portion having upper and lower flat surfaces, a shaft portion having an upper portion eccentrically erected on the same plane and having a thread at an upper portion and a groove for an adjusting tool at an upper end,
A nut for screwing to the thread and for fixing the coaxial portion.

Further, the front-rear position adjustment mechanism includes the cam mechanism provided at the four corners of the first integrator lens and / or the second integrator lens, and the second elastic member.

Further, the second elastic member is constituted by a leaf spring, a wire spring or a coil spring, and is provided near a position facing the cam mechanism with the holding frame interposed therebetween.

Further, the cam mechanism is adjusted by an adjusting tool having a through hole having the same inner diameter slightly larger than the outer shape of the nut.

Further, the total reflection mirror and the dichroic mirror comprise the second elastic member and a cam mechanism provided on a surface facing the second elastic member.

Further, the LCD has an adjustment mechanism comprising the second elastic member and a cam mechanism provided on a surface facing the second elastic member.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural view of a main part of an embodiment of an optical system of a projection type image display according to the present invention. 2 to 4 are explanatory diagrams of the adjusting mechanism in the adjusting means. The basic operation of the optical system has already been described in the section of the prior art, so that the description thereof will be omitted, and the adjusting means 4 for adjusting the mounting position of the integrator lens according to the mutual displacement of the optical system members aimed at by the present invention. A detailed description will be given mainly on the subject. The integrator lens used in the apparatus of the example is 7.5 mm X 6.0 m.
twelve horizontal microlenses with a focal length of about 25 mm
A total of 120 are arranged in 10 columns. Referring to FIG. 1, an arc portion of a light source LA such as a metal halide lamp is generated by electric discharge between arc electrodes supported by glass columns from the bottom of the lamp, but a light emitting portion such as the arc portion causes a slight displacement. . The light-emitting portion of the light source LA is generally assembled and adjusted using a manufacturing jig for suppressing dimensional accuracy under certain conditions.
When an integrator lens composed of the first integrator lens 2 and the second integrator lens 3 is used, the position of the arc image on the second integrator lens 3 is shifted within a range of several hundred microns. To correct this shift, FIG.
As shown in FIG. 5, an elastic member 40 for urging one end of two sides of the integrator lens and an adjusting screw 41 at the other end facing each other are provided, and the mounting position is set to X on a plane perpendicular to the optical axis.
Relative adjustment is performed in the (horizontal) and Y (vertical) directions.

As a first embodiment of the rotation angle adjusting mechanism in the adjusting means, first, as shown in FIG. 2A, the lower end of the frame member 4 of the first integrator lens 2 is formed in an arc shape, The upper surface of the base 6 for mounting the base 4 is also formed in an arc shape, and is rotatably combined so as to rotate.
There is a method of fixing the base 6 and the frame member 4 with fixing screws 7. The portion where the fixing screw 7 passes through the base 6 is provided with a slot (not shown) which is long along a plane perpendicular to the optical axis and extends along a concentric circle centered on the optical axis. To fix it. Thus, the angle can be adjusted with a simple configuration using screws.

FIG. 2B shows a second embodiment of the rotation angle adjusting mechanism in the adjusting means. As shown in the figure, the lower end of the frame member 4 of the first integrator lens 2 is formed in an arc shape, one end of the side surface of the frame member 4 is formed in an arc shape, and a gear portion is formed on the arc-shaped surface. The rotation angle of the frame member 4 on which the first integrator lens 2 is mounted is adjusted by rotating the gear 42 rotatably supported on the extending portion of the base 6. This has the advantage that the angle can be adjusted by rotation from the front or the rear, which is easy to adjust.

FIG. 2C shows a third embodiment of the rotation angle adjusting mechanism in the adjusting means. As shown in the figure, the rotation angle adjusting mechanism is replaced with the gear of FIG.
The rotation angle is adjusted by rotating the worm gear 43. Thereby, there is an advantage that the angle can be adjusted by rotation from the upper surface or the lower surface, and the adjustment is easy.

FIG. 2D shows a fourth embodiment of the rotation angle adjusting mechanism in the adjusting means. As shown in the figure, the rotation angle adjusting mechanism is constituted by a belt 44 and a pulley 45 fixed vertically on the side surface of the frame member 4 instead of the gear 42 in FIG. Then, the rotation angle is adjusted. Thereby, the angle can be adjusted by rotation from the front or the rear, and there is an advantage that the adjustment is easy, and the distance of the pulley,
The degree of freedom such as the mounting angle can be provided.

FIG. 3A shows a fifth embodiment of the rotation angle adjusting mechanism of the adjusting means. As shown in the figure, the rotation angle adjusting mechanism has additional adjusting screws 41 for adjusting the X axis and the Y axis shown in FIG. Thereby, in addition to adjustment in the X-axis and Y-axis directions, adjustment of the rotation direction can be performed by inserting and removing the two upper adjustment screws 41.

In FIG. 3B, the same effect can be obtained by providing the adjustment screw 41 at one location on the upper side and increasing the side face at two locations. FIG. 3C shows an example in which two additional locations are provided on the side and below, and FIG. 3D shows an example in which two additional locations are provided on the side and above. In each of these cases, the rotation direction can be adjusted only by adding the adjustment screw 41, and a simple configuration can be achieved.

FIG. 4A is a front view for explaining a tilt adjusting mechanism and a front-back direction adjusting mechanism in the adjusting means.
(B) is an AA cross-sectional view, (c) is a perspective view for explaining a cam mechanism constituting a tilt adjustment mechanism and a front-rear direction adjustment mechanism, and (d) is a perspective view of an adjustment tool. FIG. 4 (a) is based on a frame member 4 incorporating the rotation angle adjusting mechanism according to the fifth embodiment described above.
The frame member 4 is arranged between the base member 6a and the upper base 6b.
The frame member 4 has a second elastic member 6 such as a plate spring, a wire spring or a coil spring fixed to the bases 6a and 6b behind the four corners.
It is urged forward by c. A cam mechanism 46 is formed at each of four front corners of the frame member 4 pushed by the second elastic member 6c. The cam mechanism 46 has, as shown in FIG. 4 (c), a cylindrical portion 46a having a flat upper and lower surface, a thread at an upper portion eccentrically provided on one flat surface, and a groove for an adjusting tool at an upper end. A shaft portion 46b and a nut 46c screwed to the thread and fixing the coaxial portion 46b are provided. A lower portion of the shaft portion 46a is rotatably fitted into a hole provided in the base 6.

With the above configuration, when the nut 46c is loosened and the shaft 46b is rotated by a screwdriver or the like, the cylindrical portion 46a is eccentric, so that the position of the frame member 4 can be adjusted by the rotation angle. . For example, if the lower part is fixed and the cam mechanism 46 is provided only on the upper part for adjustment, the vertical inclination can be adjusted. If one side is fixed and the cam mechanism 46 is provided on the other side for adjustment, it is possible to adjust the front-back inclination with respect to the left-right direction. Further, if the cam mechanisms 46 are provided at the four corners as shown in the drawing, it is possible to adjust not only the vertical tilt and the horizontal tilt, but also the front and rear positions. Further, the base 6 is provided with an adjustment hole for an adjustment screw 41 provided on the frame member 4 so that the X axis and the Y axis can be adjusted. The number and position of the cam mechanisms 46 to be provided can be increased or decreased or changed in location by a necessary adjusting mechanism. For example,
If only vertical inclination is to be adjusted, the cam mechanism 46 may be provided at only one location at the upper center.

FIG. 4D shows an example of the adjusting tool 47.
The adjusting tool 47 has a through-hole having the same inner diameter that is slightly larger than the outer shape of the nut 46c, the nut 46c is loosened, a tool such as a screwdriver is inserted into the through-hole, and the upper part of the cam mechanism shaft 46b is inserted. , And the nut 46c may be tightened by the adjustment tool 47 at an appropriate position. that's all,
Although the integrator adjusting means of the present invention has been described, the present invention is not limited to the integrator lenses 2 and 3, but other optical members such as total reflection mirrors MR1 to MR
4. Dichroic mirror RF1, RF2 or LCD
(LCDr, LCDg, LCDb) and other adjustment mechanisms can be similarly applied, and it is needless to say that the effects can be exhibited.

[0032]

As described above, according to the present invention, in addition to the adjustment function in the X-axis and the Y-axis directions, one or both of the first integrator lens and the second integrator lens can be used. , The adjustment function of the tilt direction and the front-back direction is provided, so that the deviation of the optical axis due to the manufacturing variation and the mounting variation of the optical member can be eliminated, and the projection type image display that can maximize the brightness of the projection screen. The device was proposed.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an embodiment of an optical system of a projection type image display device according to the present invention.

FIG. 2 is an explanatory diagram of a lens adjusting unit according to the present invention.

FIG. 3 is an explanatory diagram of a lens adjustment mechanism according to the present invention.

FIG. 4 is an explanatory diagram of a lens adjustment mechanism according to the present invention.

FIG. 5 is an explanatory diagram of a lens adjustment mechanism showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projection type image display apparatus 2 1st integrator lens 3 2nd integrator lens 4 Frame member 5 Adjusting means 6, 6a, 6b Base 6c 2nd elastic member 7 Fixing screw 40, 40a Elastic member 41 Adjusting screw 42 Gear 43 Worm gear 44 Belt 45 Pulley 46 Cam mechanism 46a Cylindrical part 46b Shaft part 46c Nut 47 Adjustment tool LA light source LCDr, LCDg, LCDb LCD (liquid crystal display panel) LN1, LN2r, LN2g, LN2b Condenser lens LN5 Projection optical system MR1, MR2, MR2 , MR4 total reflection mirror RF1, RF2 dichroic mirror DR dichroic prism S screen

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 5/74 H04N 5/74 KA 9/31 9/31 B F term (reference) 2H088 EA15 EA19 HA13 HA24 HA25 HA28 MA20 5C058 AA06 AB04 BA05 EA12 EA26 5C060 BC05 DA03 GA01 GB06 GB09 GC00 HC01 HC20 HC21 HD02 JB06 5G435 AA01 BB12 BB15 CC09 CC12 DD02 DD06 EE13 EE26 EE50 GG04 KK03 LL04

Claims (17)

[Claims] An incident light beam from a light source is evenly condensed by an integrator and reflected by a total reflection mirror to form an R (red) G light.
(Green) Separates light with a dichroic mirror having spectral characteristics such as B (blue), and modulates light with image signals by light valve control means such as an LCD (liquid crystal display panel) for each color.
A projection-type image display device that combines each light-modulated color with a dichroic prism or the like and enlarges and projects an image on a screen with a projection optical system, wherein the integrator unit is a group of a large number of microlenses, immediately after the light source. A first integrator lens and a second integrator lens disposed at the focal point of the first integrator lens. The first integrator lens and / or the second integrator lens A projection-type image display device, further comprising an adjustment unit having a rotation angle adjustment mechanism that can adjust a mutual rotation direction shift of the incident light beam with respect to a plane perpendicular to the optical axis. 2. An incident light flux from a light source is evenly condensed by an integrator and reflected by a total reflection mirror to form an R (red) G light.
(Green) Separates light with a dichroic mirror having spectral characteristics such as B (blue), and modulates light with image signals by light valve control means such as an LCD (liquid crystal display panel) for each color.
A projection-type image display device that combines each light-modulated color with a dichroic prism or the like and enlarges and projects an image on a screen with a projection optical system, wherein the integrator unit is a group of a large number of microlenses, immediately after the light source. A first integrator lens and a second integrator lens disposed at the focal point of the first integrator lens. The first integrator lens and / or the second integrator lens A projection-type image display device, further comprising an adjustment unit having an inclination adjustment mechanism for adjusting a deviation of the incident light beam in a direction perpendicular to a plane perpendicular to the optical axis. 3. An R (red) G light beam incident from a light source is evenly condensed by an integrator and reflected by a total reflection mirror.
(Green) Separates light with a dichroic mirror having spectral characteristics such as B (blue), and modulates light with image signals by light valve control means such as an LCD (liquid crystal display panel) for each color.
A projection-type image display device that combines each light-modulated color with a dichroic prism or the like and enlarges and projects an image on a screen with a projection optical system, wherein the integrator unit is a group of a large number of microlenses, immediately after the light source. A first integrator lens and a second integrator lens disposed at the focal point of the first integrator lens. The first integrator lens and / or the second integrator lens A projection type image display device provided with an adjusting means having a front-rear position adjustment mechanism capable of adjusting mutual positional deviation in the front-rear direction. 4. The apparatus according to claim 1, wherein said adjusting means has an adjusting mechanism for adjusting said first integrator lens in the X or Y direction and adjusting said second integrator lens in the Y or X direction. 3. The projection type image display device according to 3. 5. The first integrator lens, and
Alternatively, the second integrator lens is fixed to a holding frame having an arc-shaped bottom surface, and the bottom surface is rotatably engaged with a base having an arc-shaped top surface. And the base, a long hole formed in the base, along a plane perpendicular to the optical axis of the incident light beam, and a long hole that is long in the rotation direction about the same optical axis, and a fixing screw inserted through the long hole. The projection type image display device according to claim 1, wherein the projection type image display device is configured. 6. The projection type according to claim 5, wherein said rotation angle adjusting mechanism comprises an arc gear part formed on a side surface of said holding frame and a gear formed on said base. Image display device. 7. The projection type according to claim 5, wherein the rotation angle adjusting mechanism comprises an arc-shaped gear portion formed on a side surface of the holding frame and a worm gear formed on the base. Image display device. 8. The projection type image display according to claim 5, wherein said rotation angle adjusting mechanism comprises a belt fixed to the upper and lower sides of said holding frame and a pulley formed on said base. apparatus. 9. The first integrator lens, and
Or while fixing the second integrator lens to the holding frame, the first integrator lens at either one of the left and right and up and down one end of the holding frame,
Alternatively, an elastic member for urging the second integrator lens is provided, and the rotation angle adjusting mechanism is provided on one of the surfaces of the elastic member and the holding frame facing the elastic member. 2. The projection type image display device according to claim 1, comprising an adjusting screw and two adjusting screws provided on the other surface. 10. The rotation angle adjusting mechanism comprises the elastic member and two adjusting screws provided on respective surfaces of the holding frame facing the elastic member. The projection type image display device according to claim 9. 11. The tilt adjusting mechanism is disposed behind the first integrator lens and / or the second integrator lens, and has one end of the first integrator lens and / or the second integrator lens forward. A second elastic member for biasing, and a cam mechanism provided on a surface facing the second elastic member in front of the first integrator lens and / or the second integrator lens. Claim 10
The projection type image display device according to the above. 12. The cam mechanism, comprising: a cylindrical portion having a flat upper and lower surface; a shaft portion having a screw thread at an upper portion eccentrically erected on the same plane and a groove for an adjusting tool at an upper end; The projection type image display device according to claim 11, further comprising a nut screwed into the thread and fixing the coaxial portion. 13. The front-rear direction adjusting mechanism includes the cam mechanism provided at four corners of the first integrator lens and / or the second integrator lens, and the second elastic member. Claim 11
Or a projection type image display device according to item 12. 14. The second elastic member is formed of a leaf spring, a wire spring, or a coil spring, and is provided near a position facing the cam mechanism with the holding frame interposed therebetween. 14. The projection type image display device according to 11 to 13. 15. The cam mechanism according to claim 11, wherein said cam mechanism is adjusted by an adjusting tool having a through hole having an inner diameter slightly larger than an outer shape of said nut.
5. The projection type image display device according to item 4. 16. The apparatus according to claim 16, wherein the total reflection mirror and the dichroic mirror have an adjusting mechanism including the second elastic member and a cam mechanism provided on a surface facing the second elastic member. The projection-type image display device according to claim 11, wherein: 17. The LCD according to claim 11, wherein the LCD has an adjustment mechanism including the second elastic member and a cam mechanism provided on a surface facing the second elastic member. Projection image display device.