JP3511549B2 - Liquid crystal display multi-projection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display multi-projection device configured to perform multi-projection by using a plurality of projection devices for enlarging and projecting a transmission image formed by a liquid crystal display on a projection screen.

[0002]

2. Description of the Related Art FIG. 6 shows, for example, Japanese Patent Laid-Open No. 63-12301.
FIG. 10 is an exploded perspective view showing a conventional liquid crystal display multi-projection device shown in Japanese Patent Laid-Open No. 9-90. In the figure, a plurality of projection apparatuses A each having a plurality of functional units are prepared, and each projection apparatus A is attached to one base plate B with its position or inclination angle adjusted. The functional unit of the projection device A includes an illumination unit 1, an image installation unit 2 and a projection lens installation unit 3. The illumination unit 1 includes a lamp 1c installed in a lamp case 1a and a lamp cover 1b, a condenser lens 1d, an optical path changing / reflecting mirror 1e, a condenser Fresnel lens 1f, and a bracket 1g that combines these into an integrated structure. Etc. The image setting unit 2 includes a bracket 2a, three rollers 2b provided on the bracket 2a, a disc-shaped liquid crystal mounting portion 2c rotatably supported by the roller 2b, and It is composed of a transmissive liquid crystal display 4 fixed to a central portion of the liquid crystal mounting portion 2c with a stopper 2c1 and a reflection mirror 2d.
The projection lens installation unit 3 includes a projection lens 3a and a projection lens mounting position adjusting section 3b and a base plate which are configured to adjust the vertical position of the projection lens 3a by the adjusting screw portion 3b1 to set the size of the projection screen. It is composed of a projection lens setting flange 3c and the like for attaching to B.

In order to facilitate the alignment of the projection screens on the projection screen, the one-plate base plate B is a set of four projection devices A of the above construction (the other three have the same construction). When attached, at least the positional relationship between them is adjusted so that they can be adjusted. That is, the base plate B has a projection lens setting flange 3
The flange hole B1 in which the positional relationship of the projection lens installation unit 3 is adjustable by c, and the position of the projection lens setting flange 3c in contact with the flange hole B1 are adjusted, and then a small screw 5 is used for fixing. Insert hole for screw 5 B2
Has been drilled. In addition, the width at which the liquid crystal position adjusting knob 2c2 fixed to the liquid crystal mounting portion 2c is rotatably inserted.
A knob adjusting hole B3 having a length and a knob adjusting hole B
Liquid crystal position adjusting knob 2c2 is inserted in 3, and after adjusting the whole position of the image setting unit 2 including the relationship of the optical axis etc., for the small screw 6 for fixing the image setting unit 2 with the small screw 6. An insertion hole B4 and a small screw 7 insertion hole B5 for adjusting the position of the illumination unit 1 and then fixing the same with the small screw 7 are provided.

These flange holes B1 or insertion holes B1
B5 to B5 are machined in accordance with the number of fixing screws and the like of the projection apparatus A. In this case, the distance between the projection screen and the base plate B is predetermined, that is, the enlargement ratio is substantially fixed, and each flange hole B1 or insertion holes B1 to B5 has an adjustment amount of ± several units. It is machined in such a size that it can be adjusted with a very small amount of movement of mm. Further, the center-to-center distance to the other flange hole B1 for the projection device A is 1/2 of the length of each side of the projected image.
Is machined to.

In such a configuration, the projection images are aligned with each other as follows. (B) Since the image size can be adjusted within the depth of focus by selecting a lens having a deep depth of focus, such a lens is used to adjust the projection lens mounting position adjusting unit 3b. It is determined by rotating and moving the projection lens 3a up and down (moving in the arrow γ direction) to change the focal length. (B) For alignment of images in the front-rear, left-right direction (x, y directions), etc., the play amount of the projection lens installation flange 3c is ± several mm.
Do by moving. (C) The twist of the image (screen rotation) is adjusted by rotating the liquid crystal mounting portion 2c on the three rollers 2b on the optical axis by the liquid crystal position adjusting knob 2c2. (D) The distortion is determined by the enlarging accuracy of the projection lens 3a, and thus is determined by the required image compositing accuracy.

[0006]

Since the attitude control mechanism of the conventional liquid crystal display multi-projection apparatus is constructed as described above, the image size is adjusted by moving the lens within the depth of focus of the projection lens. The focal length had to be changed, and an expensive lens with a deep depth of focus had to be used.

Further, the adjustment of the position of the image in the front-rear, left-right direction is performed by moving the play of the fixing screw of the projection lens installation flange to perform the position adjustment, but the adjustment is difficult because there is no fine adjustment mechanism. In addition, since the fixing after the adjustment is performed by tightening the screw, the adjustment position sometimes shifts during the fixing.

Further, due to the performance of the projection lens, the periphery of the image is distorted when the adjustment range is expanded. Further, since the image composition on the projection screen of the conventional liquid crystal display multi-projection device is performed by fixing the positional relationship between the plurality of projection devices A to the base plate B, the depth of the device is the size of the base plate B. There was a problem that it was decided by the constraint of the sheath and projection distance, and the depth dimension could not be shortened significantly.

The present invention has been made to solve the above problems, and a first object thereof is to obtain a thinned liquid crystal display multi-projection apparatus having a plurality of image projection units. It is a thing. The second purpose is to separate the two-axis attitude control mechanism of the vertical and horizontal direction alignment mechanism and the four-axis attitude control mechanism of the image size variable mechanism and the distortion correction mechanism to facilitate thinning of the liquid crystal display multi-projection. You get the device. A third object is to obtain a liquid crystal display multi-projection device in which the screen rotation of an image can be easily adjusted. Further, a fourth object is to obtain a liquid crystal display multi-projection device having a stable attitude control mechanism, in which control of the 2-axis attitude control mechanism and the 4-axis attitude control mechanism is simple.

[0010]

In a liquid crystal display multi-projection apparatus according to the present invention, an image of an image projection unit is projected from the rear surface of a projection screen to project the image on the front surface of the projection screen. A plurality of units each having a built-in attitude control mechanism are dispersed and arranged so that the optical axes of the projected images from the respective image projection units are projected substantially parallel to the projection screen, and the respective image projection units described above are also arranged. Corresponding to, the projection image is reflected by a reflection mirror installed so that one end is close to the projection screen and the other end is close to the bottom side of the housing, and the image synthesized on the projection screen is displayed. Make sure that the image is projected and the image is projected.
The attitude control mechanism of the shooting unit is a 2-axis attitude control mechanism and a 4-axis attitude control mechanism.
A two-axis attitude control mechanism, which is configured by an attitude control mechanism.
And the 4-axis attitude control mechanism are separated and installed in the image projection unit.
It is a collection.

In addition, in the rotation of the image screen rotation adjusting mechanism,
The heart coincides with the central axis of the projection lens of the image projection unit
It is configured as follows.

Further, a 2-axis attitude control mechanism and a 4-axis attitude control mechanism
Each control mechanism is designed to be remotely controllable.
Is.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1A and 1B show a liquid crystal display device according to an embodiment of the present invention.
1 illustrates a display multi-projection device. Figure smell
21 is a metal housing, 22 is a front surface of the housing 21.
A transparent projection screen, and 23 is an image projection unit.
The lighting unit 1 and the image installation in the prior art
It corresponds to a portion configured with the unit 2.
24 corresponds to the projection lens installation unit 3 of the prior art
Angle type image projection lens unit
The optical axis of is projected almost parallel to the projection screen 22.
Is mounted integrally with the image projection unit 23
It

Reference numerals 30 and 40 are attitude control mechanisms built in the image projection unit 23, and details of the configuration will be described later. A plurality of image projection units 23 (four in this embodiment) in which the image projection lens unit 24 and the attitude control mechanisms 30 and 40 are mounted and installed are provided. Reference numeral 26 is a reflecting mirror that faces each image projection lens unit 24, and is installed so as to be inclined so that one end is close to the projection screen 22 and the other end is close to the bottom surface side of the housing 21. It should be noted that in this embodiment, it is installed so as to form an isosceles triangle when viewed from the side, and the projected images from the respective image projection lens units 24 are reflected so that the combined image is projected on the projection screen 22. Has been done.

The attitude control mechanism is composed of a two-axis attitude control mechanism 30 and a four-axis attitude control mechanism 40 as shown in FIGS. That is, FIGS. 2 and 3 show a biaxial posture control mechanism 3 built in the image projection lens unit 24.
Indicates 0. In this figure, 31 is a base plate and 32 is Y
The axis movable plate, 33 is an X axis movable plate, and these are formed by cutting an aluminum material or by aluminum die casting. Reference numeral 34 is a guide pin that regulates the moving direction of the movable plates 32 and 33. Reference numeral 35a is a Y-axis adjustment knob, and 35b is an X-axis adjustment knob, which are formed by using eccentric pins whose center of rotation and center of the fixed shaft are offset from each other. In addition, the Y-axis adjusting knob 35a is provided on the base plate 31,
The axis adjusting knob 35b is fixed to the Y-axis movable plate 32. 36 is a fixing screw after the position adjustment of the Y-axis movable plate 32 and the X-axis movable plate 33, and 37 is a spring pressing pin fixed to the base plate 31. Spring holding pin 3
The reference numeral 7 designates a base plate 31, a Y-axis movable plate 32, and an X-axis movable plate 33 which are pressed by a spring (for example, a wave washer) so that the Y-axis movable plate 32 and the X-axis movable plate 33 can slide. ing. In this configuration, the base plate 31 is on the side facing the projection screen 22 and can be adjusted manually. Therefore, if you turn the Y-axis adjustment knob 35a in the direction of the arrow shown,
The Y-axis movable plate 32 slides in the direction of the arrow Y-axis shown in FIGS. Further, when the X-axis adjusting knob 35b is turned in the direction of the arrow shown, the X-axis movable plate 33 slides in the direction of the arrow X-axis shown in FIGS.

FIG. 4 shows a four-axis attitude control mechanism 40 built in the bottom of the image projection unit 23, which has four axes (θx, θ).
y, θz, Z) are individually adjusted. That is, 4
1 is a θz axis adjusting mechanism, 42 is a Z axis movable plate, 43 is θx,
This is a θy axis adjustment mechanism. In this mechanism, the Z-axis movable plate 42 is configured by using a commercially available fine adjustment jack, and adjusts the direction of the arrow Z axis shown in FIGS. 1 and 2. In this embodiment, the adjustment of the direction of the arrow Z axis changes the size of the image projected on the projection screen 22, and serves as an image enlargement magnification variable mechanism. The Z-axis adjustment knob 44 adjusts the direction of the arrow Z-axis. [theta] z axis adjustment mechanism 41 has been installed the rotation center ([theta] z fulcrum) in a position aligned with the optical axis of the projection image of the projection screen 22, by turning the [theta] z adjustment knob 45 shown, the [theta] z fulcrum The θz adjusting mechanism 41 is centered on the arrow θz.
Rotate in the direction. In this embodiment, the rotation in the direction of the arrow θz is to adjust the screen rotation of the projected image so that the X-axis and Y-axis directions of the images projected by the respective image projection lens units 24 are correctly aligned. . This θz
The details of the configuration of the axis adjusting mechanism (screen rotation adjusting mechanism) 41 will be described later.

The θx, θy axis adjusting mechanism 43 is mounted on a Z axis movable plate (image magnification changing mechanism) 42,
By rotating the illustrated θx adjusting knob 46, the θx and θy axis adjusting mechanism 43 rotates in the direction of the arrow θx about the θx fulcrum. Further, by rotating the θy adjusting knob 47, the θx and θy axis adjusting mechanism 43 is configured to rotate in the arrow θy direction about the θy fulcrum. Arrow θ
In this embodiment, the rotation in the x direction is such that the projected images are adjusted so that the left and right sizes of the images projected by the respective image projection lens units 24 are correctly matched. Further, in the rotation in the direction of the arrow θy, in this embodiment, the projected images are adjusted so that the vertical sizes of the images projected by the respective image projection lens units 24 are correctly matched.

FIG. 5 is an exploded view of the θz axis adjusting mechanism (screen rotation adjusting mechanism) 41. In the figure,
Reference numeral 41a is a θz base plate, 41b is a θz movable plate, 41c is a shaft seat constituting a rotation center axis, 41d is a small screw, 41e is a flat washer, and the θz movable plate 41b rotates about the shaft seat 41c. Is configured. 45 is a θz adjustment knob, 41f is a knob shaft, 41g is a knob shaft guide seat, 4
1h is a knob bearing seat. Reference numeral 41j is a small screw for fixing the knob shaft guide seat 41g to the θz movable plate 41b, and a small screw for fixing the knob shaft seat 41h to the θz base plate 41a. 41k is the θz adjustment knob 45
Is a hexagon socket head cap screw for fixing to the knob shaft 41f, and 41m is a θz fixing lock screw.

Since the entire liquid crystal display multi-projection apparatus in the above embodiment is constructed as shown in FIG. 1, the depth dimension of the apparatus is the conventional liquid crystal display while maintaining the projection distance determined by the projection magnification. It can be significantly shortened compared to the multi-projector. Also,
Variations in the finish accuracy of each image projection unit and the inclination of the image projection unit installation surface due to the finish accuracy of the housing,
By mechanically correcting the image shift caused by the installation accuracy of the image projection unit by the adjusting mechanism shown in FIGS. 2 to 5,
The projected images from the image projection units can be combined on the projection screen to obtain a single image without seams or distortion.

Further, the two-axis attitude control mechanism 30 shown in FIGS. 2 and 3 and the four-axis attitude control mechanism 40 shown in FIGS. 4 and 5 comprise the image projection unit 23 and the image projection lens unit 24. When four image projection devices are assembled, it is possible to easily adjust the positions of the projected images on the projection screen 22 or adjust the image distortion. In such a configuration, alignment of the projected images, adjustment of distortion, etc. are performed as follows.

(B) The size of the image is adjusted in the Z-axis direction of the image projection lens unit 24 by the Z-axis movable plate (image enlargement magnification varying mechanism) 42. That is, the projection magnification is changed and determined by changing the distance between the image projection lens unit 24 and the projection screen 22. (B) Positioning of the image in the vertical and horizontal directions is performed by adjusting the image projection lens unit 24 by a number of ± using the adjustment knob 35 of the X and Y axis adjustment mechanism 30 mounted between the image projection unit 23 and the image projection lens unit 24. mm up and down or left and right. (C) The θz adjustment mechanism (screen rotation adjustment mechanism) 41 adjusts the angle so that the X-axis and Y-axis directions of the image are correctly matched.
This is done by turning the z adjustment knob 45, that is, by turning the optical axis of the projected image. (D) Since image distortion occurs due to the inclination of the optical axis of the projection image with respect to the plane of the projection screen 22, the adjustment is performed by adjusting the θx and θy axes so that the optical axis is perpendicular to the plane of the projection screen 22. This is performed by turning the θx adjustment knob 46 or the θy adjustment knob 47 of the adjustment mechanism 43.

In the above embodiment, the reflecting mirror 26
Is installed so as to form an isosceles triangle when viewed from the side as shown in FIG. 1B, the respective reflection mirrors 26 are tilted in parallel in the same direction, and the image projection unit 23 is set to one side. The same action and effect can be obtained with the device installed in the direction.

Embodiment 2. In the first embodiment, each attitude control is performed by manually operating the adjustment knobs. However, each adjustment knob has a structure that can be driven by an electric motor, and a control adjustment circuit and a remote control signal for these electric motors are provided. When the receiving circuit is incorporated in the control circuit board of the liquid crystal display multi-projection device, it is possible to perform adjustment by remote control operation while watching the image shift on the projection screen.

Embodiment 3. In the first embodiment, the case or the base plate movable plate of the adjusting mechanism, which is formed by cutting of aluminum material or aluminum die casting, has been described.
Do you use pressed products of metal plates or molded products of synthetic resin,
Alternatively, it may be configured by combining a pressed product and a synthetic resin molded product.

[0025]

Since the present invention is constructed as described above, it has the following effects.

The image projection unit having the built-in 6-axis attitude control adjusting mechanism for screen synthesis is dispersed in the housing without using the one-piece base plate as in the conventional apparatus, and is close to the projection screen. Arranged so that the optical axis of the projected image from each image projection unit is substantially parallel to the above-mentioned projection screen, and reflected by a reflection mirror close to the projection screen so that the image is projected on the projection screen. Therefore, a thin liquid crystal display multi-projection device can be obtained.

Since the attitude control mechanism has the two-axis attitude control mechanism and the four-axis attitude control mechanism separated and built in the image projection unit, the image projection unit is downsized and a thin liquid crystal display multi-projection apparatus is provided. Easy to get.

Since the center of rotation of the image screen rotation adjusting mechanism coincides with the center axis of the projection lens of the image projection unit, the screen rotation can be adjusted easily and accurately.

The two-axis attitude control mechanism and the four-axis attitude control mechanism, which are designed to be remotely controllable, can be adjusted by remote control while observing the shift of the image on the projection screen.

[Brief description of drawings]

FIG. 1 shows a configuration of a liquid crystal display multi-projection apparatus according to an embodiment of the present invention, (a) is a front view and (b) is a side view.

FIG. 2 is a perspective view showing a biaxial posture control mechanism.

FIG. 3 is an exploded perspective view of a two-axis attitude control mechanism.

FIG. 4 is a perspective view showing a four-axis attitude control mechanism.

FIG. 5 is an exploded perspective view of a screen rotation adjusting mechanism.

FIG. 6 is an exploded perspective view showing a configuration of a conventional liquid crystal display multi-projection device.

[Explanation of symbols]

21 housing, 22 projection screen, 23 image projection unit, 24 image projection lens unit, 26 reflection mirror, 30 two-axis attitude control mechanism, 31 base plate, 32
Y-axis movable plate, 33 X-axis movable plate, 35a Y-axis adjustment knob, 35b X-axis adjustment knob, 40 4-axis attitude control mechanism, 41 θz-axis adjustment mechanism, 42 Z-axis movable plate, 43
θx, θy axis adjustment mechanism, 44 Z axis adjustment knob, 45
θz adjustment knob, 46 θx adjustment knob, 47 θy adjustment knob.

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-5-328272 (JP, A) JP-A-7-333728 (JP, A) JP-A-5-289175 (JP, A) JP-A-63- 123019 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03G 21/00-21/30 H04N 5/74

Claims (3)

(57) [Claims] 1. A liquid crystal display multi-projection apparatus, wherein a liquid crystal image of an image projection unit is projected from a rear surface of a projection screen through an image projection lens unit, and a projection image is projected on the front surface of the projection screen, wherein the image projection unit has an attitude control mechanism. A plurality of units each having a built-in are distributed and arranged so that the optical axis of the projected image from each image projection unit is substantially parallel to the projection screen, and one end corresponding to each image projection unit is the other end proximate to the projection screen so as to reflect the projected image projected image synthesized on the projection screen is out copies in inclined to the installed reflecting mirror so as to be separated from the projection screen ,Up
The attitude control mechanism allows the image projection lens unit to be placed on a flat surface.
Vertical alignment machine configured to slide
Two-axis attitude controller with structure and lateral alignment mechanism
Image projection lens unit in the direction perpendicular to the above plane.
Image magnification variable mechanism configured to move
Screen rotation adjustment mechanism to adjust the screen rotation of shadow images, upper and lower
Vertical direction to correct image distortion due to orientation registration mechanism
Distortion correction mechanism and horizontal alignment mechanism
4-axis posture with lateral distortion correction mechanism to correct distortion
And a biaxial attitude control mechanism and
Separated from the axis attitude control mechanism, it was built into the image projection unit.
A liquid crystal display multi-projection device characterized in that Wherein the central axis is a liquid crystal display multi projector according to claim 1, characterized by being configured so as to coincide with the optical axis of the projection lens of the image projection lens unit of the rotary screen rotation adjustment mechanism of the projection image . 3. A two-axis attitude control mechanism and the 4-axis attitude control mechanism, a liquid crystal display multi projection device according to claim 1, wherein a has been made to allow each remote control.