JP2001109071A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently correct the distortion of an image reflection mirror installed in a projection type display device. SOLUTION: As for the projection type display device with the mirror for reflecting the image from a projector toward a screen, the device is provided with an adjusting mechanism for changing the flatness of the mirror on the peripheral part of the mirror in accordance with the necessary part unit of the mirror.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a technique for adjusting distortion of a mirror for reflecting image light of a projection display apparatus toward a screen.

[0002]

2. Description of the Related Art As a conventional technique, for example, Japanese Unexamined Patent Publication No.
As described in Japanese Patent Application Laid-Open No. 0-307202, a plurality of female screw members are joined to the back surface of a mirror that reflects video light toward a screen, and the housing frame on the mirror back surface side is penetrated by the female screw members, and is used for adjustment. There is generally known an adjustment technique for combining a male screw and deforming the surface of a mirror by rotating the male screw.

[0003]

In the mirror device of the prior art, a screw member or the like is bonded to the back surface of the mirror with an adhesive or the like, so that the reflection surface of the mirror is scratched or dirt that cannot be removed by cleaning adheres. And the image on the screen is easily degraded as a result. Also, in the case of replacing the mirror, there is a trouble that a screw member or the like must be joined to a new mirror at a predetermined position, and the mounting and adjustment thereof must be performed. Further, since the distortion is adjusted by rotating the screw on the back side of the mirror, it is difficult to secure a work space in a narrow place. If the depth dimension of the projection display device is increased in advance, the size of the device will be increased as it is. Further, since the variation in the surface distortion of the mirror differs for each mirror, it is necessary to increase the number of screw members for adjustment in order to cope with the variation, so that the operation is not efficient and the cost of the apparatus is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the drawbacks of the prior art and to make it possible to replace a mirror and adjust the distortion of a mirror by using an adjusting mechanism having a simple structure and simple work without joining a screw member or the like to the mirror surface. It is to provide the technology that can be done.

[0005]

According to the present invention, there is provided a projection display apparatus having a mirror for reflecting an image from a projection apparatus toward a screen. An arrangement is provided in which an adjustment mechanism is provided for changing the area around the mirror in accordance with the required unit of the mirror.

In such a configuration, even when the screen image is deteriorated due to the breakage of the mirror or the adhesion of dirt and the mirror must be replaced, the adjusting mechanism only contacts the mirror and the screwing portion is not used. If removed, the adjustment mechanism can be easily removed. For this reason, mirror replacement can be easily performed. Further, for example, in a configuration in which an adjusting screw or the like is provided in the adjusting mechanism, the distortion of the reflecting surface can be easily adjusted by rotating the screw. The adjustment screw operated here can be attached from the mirror reflection surface side, and therefore does not require a space for adjustment work on the back surface side of the mirror. In addition, since the adjustment mechanism can be attached at any position around the mirror, the distortion variation of the reflection surface of each mirror can be quickly and optimally corrected by a simple operation.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the first embodiment and is a view showing the front of a mirror unit 6b. This figure 1 shows the mirror 1
And an adjustment mechanism (A) 3 and a fixing metal (A) 4 which constitute an adjustment mechanism.
Is mounted from the side surface of the mirror support frame (A) 2 at a peripheral position of the mirror support frame (A) 2.

FIG. 2 shows the left side of FIG. 1 of the first embodiment. In FIG. 2, the mirror 1 is passed through a support pin 2c protruding from a member 2a of a mirror support frame (A) 2,
Standing vertically in a suspended state, attached with a holding bracket 5 to prevent detachment, and an adjusting bracket (A) on the peripheral edge of the mirror 1
3 and a fixture (A) 4 are attached from the side of the mirror support frame (A) 2 by bolts 3a and 4a.

FIG. 3 is a view showing the front of a mirror unit 6b as a second embodiment. FIG. 3 shows a configuration in which the front and back surfaces of the peripheral edge of the mirror 1 are sandwiched, and the adjusting bracket (B) 3 ′ and the fixing bracket (B) 4 ′ constituting the adjusting mechanism are placed at arbitrary positions around the mirror 1. (B) Installed from the front of 2 '.

FIG. 4 is a perspective view of a projection type display device 6 having a screen 6a for displaying images in multiple stages and multiple rows, and a mirror unit to be assembled in the projection type display device 6.

FIG. 5 is a plan sectional view of the projection display apparatus shown in FIG. In FIG. 5, a projection device 6c is supported by a projection type display device 6 with a member 6d to be in a horizontal state.
The mirror unit 6b is supported by a support beam 6e to be in a vertical state, and the screen 6a is supported by a screen frame 6f, and each is attached in a multi-stack. The projection display device 6 reflects the image light 6g emitted from the projection device 6c on the mirror 1 of the mirror unit 6b,
A video is displayed on a. Further, in FIG.
Indicates that the screen 6a, the mirror 1, and the projection device 6c can be cleaned and the components can be replaced inside the projection display device 6. At the same time, the work space 8 and the worker 7 that require the replacement of the mirror 1 in the conventional technology
Is shown on the rear surface of the projection display device 6. Naturally, it is desirable that this work space 6 can be made unnecessary.

The features of the present invention will be described below with reference to FIGS.

The present invention is not a method of connecting a plurality of screws directly to the back surface of a mirror and performing the distortion adjustment on the entire surface of the mirror, as in the prior art, in the correction adjustment of the surface distortion generated in each mirror. Removable fixing bracket 4 shown in
The adjustment fitting 3 is attached to the support frame 2 by sandwiching it between the front and back surfaces of the mirror at an arbitrary position where the distortion of the mirror 1 occurs, and the distortion is efficiently corrected by the adjustment bolt 3 b of the adjustment fitting 3.

Here, the configuration of the adjustment fitting 3 and the fixing fitting 4 and a method of adjusting the distortion of the mirror 1 will be described with reference to the drawings.

FIG. 6 shows images 6g ', 6a on the four screens 6a', 6a ", 6a '" of the projection display device 6.
g "and 6g '". FIGS. 7, 11, and 1
FIG. 4 shows the state of displacements 9, 9 ', 9 "due to mirror distortion of the images 6g', 6g", 6g '"projected on the respective screens 6a', 6a", 6a '". 12 and 15
7 shows the effective attachment positions of the adjustment fitting 3 and the fixing fitting 4 used to correct the deviation of each image shown in FIGS. 7, 11, and 14. FIG.

FIGS. 9, 10 and 13 are cross-sectional views of the adjusting fitting 3 and the fixing fitting 4. FIG.

First, in FIG. 7, the image 6g 'is barrel-shaped on the left side, and the image 6g' is shifted 9 to the upper left and lower left.
Has occurred. The distortion of the mirror is adjusted to correct the deviation of the image. In order to correct the displacement at the upper left of the image in FIG. 8, first, the mirror fixing bracket (A) 3 is attached to the upper left of the mirror 1 with the bolt 3a from the mirror 1 reflection surface side. This is because the mirror 1 is attached to the mirror support frame (A) 2 in a state of being suspended vertically, and if the adjustment bracket 3 is attached as it is and the adjustment is performed as it is, the distortion occurs at points other than the point where distortion correction should be performed. Will be generated. Therefore, the fixing bracket 4 shown in FIG.
Then, the mirror 1 is fixed to the mirror support frame 2 with bolts 4a, and the mirror 1 is clamped to fix the mirror 1 at the mounting position.
In addition, the fixing hole of the fixing bracket 4 is a long hole for adjustment when the mirror 1 is sandwiched. In the mirror adjustment, adjustment is performed with the point fixed on the fixing bracket 4 as a fulcrum and the adjustment bracket 3 attached to an arbitrary position for correcting the distortion of the mirror 1 as an operation point, so that the mirror 1 can be adjusted at any desired position. Only the distortion correction can be performed, and the working efficiency is much better than before. Also, the mirror support frame 2 of the mirror 1
When the mirror was mounted on the mirror support frame 2, the mirror was suspended vertically from the mirror support frame 2.
(A) It is effective to prevent the stress from the mounting member when mounted on the mirror 2, that is, the distortion of the mirror 1 caused by the external force. Here, this mirror mounting method is shown in FIG.
This will be described with reference to FIG. A member 2 attached to the mirror support frame 2 by making through holes at two places at the upper part and one place at the lower part of the mirror 1
a to the support pin 2b (installed at two places at the upper part and one place at the lower part of the mirror support frame, similarly to the mirror through hole)
Pass through. After that, the holding metal 5 is put on the upper and lower three supporting pins 2b passing through the through hole of the mirror 1 to cover the mirror 1, and the supporting pins 2b are pressed. I do. In addition, a play is provided between the holding metal member 5, the mirror 1, and the supporting pin 2b so that stress is not applied to the mirror 1 from the supporting pin 2b and the holding metal member 5. Therefore, the mirror 1 is fixed to the mirror support frame 2 while being suspended vertically by the support pins 2b, so that the mirror 1 is not distorted by an external force.

Next, the structure and adjustment method of the adjustment fitting 3 will be described with reference to FIGS. FIG. 10 shows a cross-sectional view of the adjustment fitting 3. The adjusting bracket 3 has a configuration in which the pressing member (A) 3e of the adjusting bracket 3 made of a spring material is sandwiched between the front and back sides of the mirror 1 and the peripheral edge of the mirror 1 is fixed to the mirror supporting frame 2 with bolts 3a. I have. Attachment points for correcting the image shift shown in FIG. 7 are two places, that is, the upper left and the lower left where the image needs to be corrected. In the adjusting method, since the shift width 9 of the image is within the screen range according to FIG. 7, it is necessary to press the mirror in the distortion direction shown in FIG. For this purpose, a compression member (A) 3e made of a spring material of the adjustment fitting 3 is used.
The adjustment bolt 3b is inserted into the rigid member 3d of the harm adjustment metal fitting 3.
When the adjustment bolt 3b is tightened and the adjustment bolt 3b is tightened, the spring compression member 3e sandwiching the mirror of the adjustment bracket 3 compresses the distortion direction of the mirror 1 shown in FIG. The image can be corrected.

Further, since the adjusting bracket 3 has a structure in which the front and back surfaces of the mirror 1 are sandwiched, the adjusting bracket 3 can press the mirror in a direction opposite to the pressing direction. This method will be described with reference to FIGS. 11, 12, and 13.

FIG. 11 shows a state in which the image 6g "extends beyond the screen size 6a". To correct the main image, it is necessary to press the mirror 1 in the adjustment direction shown in FIG. As described above, the fixing bracket 4 is first attached to the position where the image is displaced (FIG. 12), and then the adjustment fitting 3 is fixed to the adjustment position (FIG. 12). FIG. 13 is a cross-sectional view of the adjustment fitting 3. In order to press the mirror in the adjustment direction, the adjustment bolt 3b is attached to the spring material pressing member (B) 3e 'of the adjustment fitting 3 receiving the back surface of the mirror 1. Attach. The spring member pressing member (B) 3e 'is female-threaded, and the adjusting bolt 3b comes into contact with the mirror support frame 2 as the adjusting bolt 3b is tightened. Here, when the adjustment bolt 3b is further tightened, the portion of the compression member 3e 'which is a spring material is pulled by the adjustment bolt 3b, and the mirror 1 is bent in the adjustment direction. Thus, the image shown in FIG. 11 can be corrected. Due to the structure of this adjusting bracket 3,
The mirror can be adjusted by one adjustment fitting 3 and one adjustment bolt 3b. Fig. 14 shows a state in which a dent-shaped image shift 9 "is present on the left side of the screen. In this case as well, the fixing fitting 4 and the adjusting fitting 3 are replaced with the necessary adjustment portions of the mirror by the method described above. Fig. 15 shows the mounting positions of the respective adjustment fittings.
In order to attach the mirror 1 to a place where adjustment is necessary, the mirror support frame 2 to which the adjustment fitting 3 is attached has female screws arranged all around. The female screw 2c is shown in FIG.

In this manner, by disposing the adjustment fitting only at an arbitrary position where adjustment is required, the number of adjustment members and adjustment mechanisms can be reduced as compared with the prior art, and the working efficiency can be improved. The mounting and adjustment of these adjustment brackets can all be performed from the mirror reflection surface, that is, from the inside of the projection display device. This eliminates the need for an adjustment work space on the rear surface of the mirror, that is, the rear surface of the projection display device, which is required in the related art. Therefore, an increase in the depth of the projection display device due to the work space on the rear surface of the mirror in the projection display device or It is not necessary to secure a space on the rear surface of the projection display device, and the installation restrictions of the projection display device are greatly reduced.

[0023]

According to the present invention, distortion correction of the image reflecting mirror of the projection display apparatus can be performed by a simple operation using a simple adjusting mechanism having a small number of adjusting parts. Further, it is possible to easily adjust the mirror at an arbitrary position. Mirror replacement and attachment / removal are also easy. The installation space may be small, and the restrictions on the installation can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram of a first embodiment of the present invention.

FIG. 2 is a side view of the configuration shown in FIG.

FIG. 3 is a diagram of a second embodiment of the present invention.

FIG. 4 is a perspective view of a projection display device equipped with a mirror unit by the adjustment mechanism of the present invention.

FIG. 5 is a plan sectional view of the configuration shown in FIG. 4;

FIG. 6 is a front view of the projection display apparatus displaying an image shift.

FIG. 7 is a diagram of the upper front left surface of the screen shown in FIG. 6;

FIG. 8 is a mounting diagram of a mirror adjustment bracket and a fixing bracket.

FIG. 9 is a sectional view of the mirror fixing bracket of FIG. 8;

FIG. 10 is a cross-sectional view of a mirror adjustment fitting.

11 is a diagram of the upper right surface of the screen front of FIG. 6;

FIG. 12 is a mounting diagram of a mirror adjustment bracket and a fixing bracket.

FIG. 13 is a sectional view of the mirror adjustment fitting of FIG. 12;

14 is a view of the lower left surface of the front of the screen of FIG. 6;

FIG. 15 is a mounting diagram of a mirror adjustment bracket and a fixing bracket.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mirror, 2 ... Mirror support frame (A), 2 '... Mirror support frame (B), 2a ... Member, 2b ... Support pin, 2c ... Screw hole,
3 ... Adjustment bracket (A), 3 '... Adjustment bracket (B), 3a ... Bolt, 3b ... Adjustment bolt, 3c ... Long hole, 3d ... Rigid member,
3e: Spring material compression member (A), 3e ': Spring material compression member
(B), 4 ... Fixing bracket (A), 4 '... Fixing bracket (B), 4a ...
Bolt, 5: Holder, 5b: Screw, 6: Projection display device, 6a: Screen, 6a ': Screen (upper left), 6
a '': screen (upper right), 6a ''': screen (lower left), 6b: mirror unit, 6c: projection device, 6d ...
Support base, 6e: support beam, 6f: screen frame, 6g: video, 6g ': video (upper left), 6g''... video (upper right), 6g'''
... image (lower left), 7 ... worker, 8 ... work space, 9 ... image shift width.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Koshu Ichikawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media System Division, Hitachi, Ltd. (72) Inventor Tadashi Sato Yoshida, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture 292, Cho, Hitachi Image Information Systems, Ltd. 292 Yoshida-cho, Totsuka-ku F-term in the Digital Media System Division of Hitachi, Ltd. (Reference) 5C058 EA01 EA13 5G435 AA01 BB17 DD06 DD11 GG08 GG41 LL15

Claims (5)

[Claims] 1. A projection display device having a mirror for reflecting an image from a projection device toward a screen, wherein the flatness of the mirror is adjusted at a peripheral portion of the mirror in accordance with a required unit of the mirror. A projection display device comprising a mechanism. 2. The projection display device according to claim 1, wherein the adjusting mechanism sandwiches the front and back of the mirror, and partially presses the front or back surface of the mirror by a screw operation. 3. The projection display device according to claim 2, wherein said adjusting mechanism is configured to perform said screw operation from a reflection surface side of said mirror. 4. The projection display device according to claim 2, wherein said adjustment mechanism has a configuration having an elastic body. 5. The adjusting mechanism supports the mirror by means of suspending the mirror vertically or by means of making the mirror self-supporting. A gap for distortion adjustment is provided on the back surface of the mirror, and a play for adjustment is provided on a support portion of the mirror. 3. The projection display device according to claim 2, which has a configuration.