JP4236978B2 - Image distortion correction mechanism for rear projection image display device and rear projection image display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear projection type image display device that changes an optical path of an image from a projection device using a reflection mirror and projects the image onto a screen from the back, and more particularly to an image distortion correction mechanism for correcting image distortion generated by the reflection mirror. It is.
[0002]
[Prior art]
Conventionally, as this type of image distortion correction mechanism, for example, in a projection display apparatus having a mirror that reflects an image from a projection apparatus toward a screen, the flatness of the mirror is determined according to a necessary unit of the mirror. (See, for example, Patent Document 1), and further, a set screw that presses the vicinity of the central part of each side of the trapezoidal reflecting mirror is screwed to make the reflecting mirror into an arcuate shape. There is known a technique (for example, see Patent Document 2) that corrects a phenomenon (pin distortion) in which the periphery of a projected image becomes a pincushion shape by being deformed.
[0003]
[Patent Document 1]
JP 2001-109071 A (first page, FIG. 1)
[Patent Document 2]
JP 2002-77777 A (page 3-4, FIG. 1)
[0004]
[Problems to be solved by the invention]
In a rear projection image display device having a reflection mirror, it is difficult to accurately project the image from the projection device on the screen, and the image is adjusted to an optimal position using a position adjuster (6-axis adjuster). ing. However, the position adjuster can only adjust the position of the projection device in the vertical and horizontal directions, enlargement / reduction, rotation, vertical trapezoidal shape, horizontal trapezoidal direction, and cannot correct image distortion caused by the reflecting mirror.
[0005]
The conventional image distortion correcting mechanism of the reflecting mirror has a complicated structure and has a plurality of adjustment portions, so that the adjustment method is difficult. In addition to the deflection of the reflecting mirror, there is distortion that the rectangular image is deformed into an unequal trapezoid when the reflecting mirror is off the same plane, but the conventional image distortion correction mechanism corrects it. I couldn't. If there is this unequal trapezoidal distortion, it is not possible to project an accurate image on the screen, especially when the image is multi-configured, it becomes difficult to match adjacent images, and there is no sense of unity on the screen Is happening.
[0006]
An object of the present invention is to provide an image distortion correction mechanism having a function capable of removing image distortion caused by a reflection mirror including the above-mentioned unequal trapezoid caused by the reflection mirror deviating from the same plane with an inexpensive and simple operation. There is to do.
[0007]
[Means for Solving the Problems]
The image distortion correction mechanism of the rear projection type image display apparatus according to the present invention is an image distortion correction mechanism of the rear projection type image display apparatus that changes the optical path of the image from the projection apparatus by a rectangular reflecting mirror and projects the image onto the screen from the rear side. ,
A pair of mirror holding members that hold both sides of the reflecting mirror over the entire side , a pair of connecting members fixed to one end of the mirror holding member, and a base member , respectively, And a pair of plane adjusting means that act to displace the one end in a direction substantially perpendicular to the reflection plane of the reflection mirror.
[0008]
Furthermore, a rear projection type video display device according to another invention is a rear projection type video display device having the above-described video distortion correction mechanism inside, and the outside being configured by a screen and a cabinet,
The projection device disposed at the bottom of the cabinet and outputting a projected image in the upward direction and the image distortion correction mechanism are held at an angle inclined with respect to the vertical direction of the screen to change the optical path of the projected image. And a reflecting mirror that
The projection image output from the projection device is configured to be projected onto the back surface of the screen through the reflection mirror.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is an external perspective view showing a configuration of a main part of a rear projection type video display apparatus employing a video distortion correction mechanism according to the present invention.
[0010]
As shown in FIG. 1, the rear projection type image display apparatus 1 has a projection device 2 arranged on a position adjuster 3 that is fixedly arranged at the bottom inside the cabinet 8, and a rectangular or trapezoidal shape ( In this embodiment, a reflecting mirror 4 having a trapezoidal shape is disposed at a certain angle, and a screen 5 is attached to the front. As a result, the projected image output from the projection device 2 is projected on the screen 5 after the optical path is changed by the reflection mirror 4.
[0011]
FIG. 3 shows a configuration example in which the rear projection type image display apparatus 1 having such a configuration is configured as a multi-projector that forms one large screen by, for example, overlapping vertically and horizontally. FIG. 4A is a front view seen from the screen side, and FIG. 4B is a side view thereof. As shown in the figure, this multi-projector is configured to form one multi-screen by four rear projection image display devices 1.
[0012]
Next, a configuration of a portion in the cabinet 8 where the reflection mirror 4 is attached to the upper part will be described below. FIG. 2 is an exploded perspective view of the image distortion correction mechanism for correcting the image distortion while attaching the reflection mirror 4 to the upper part inside the cabinet 8, and FIG. 4 shows the portion supporting the reflection mirror 4 on the upper side in the AA direction (FIG. 1). 5 is a cross-sectional view of a main part when the part that supports the reflection mirror 4 at the lower side is viewed from the BB direction (FIG. 1).
[0013]
As shown in FIGS. 1 and 4, the trapezoidal reflection mirror 4 has a mirror support member 17 whose upper side, which is the long side, is fixed to a frame 18 so that the position thereof can be adjusted, and the mirror support member 17. It is clamped and fixed by an L-shaped mirror fixing member 16 fixed by a fixing screw 19. The mirror support member 17 is fastened to the frame 18 with a fixing screw 20. Before that, the mirror support member 17 is rotatably held by the frame 18, and is adjusted with a screw hole formed in the mirror support member 17. By turning 21, the positions in the directions of arrows C and D are adjusted.
[0014]
For this reason, the long hole 17a of the mirror support member 17 through which the fixing screw 20 passes is formed such that the same direction is the longitudinal direction. As shown in FIG. 1, the frame 18 corresponding to the base is provided above the cabinet 8 and is disposed in parallel with the horizontal direction of the screen 5.
[0015]
As shown in FIG. 1, a frame 12 for supporting the reflection mirror 4 is disposed in the rear of the cabinet 8 in parallel with the horizontal direction of the screen 5. A pair of mirror support members 9 a and 9 b for supporting the reflection mirror 4 is fixed to the upper surface of the frame 12.
[0016]
As shown in FIGS. 1 and 5, both sides of the reflection mirror 4 are mounted on the mounting portions of the mirror holding members 15 a and 15 b such as L-shaped drawing materials on which the end portions are mounted, and on the mirrors. It is sandwiched and fixed by a Z-shaped fixing bracket 6 that is fixed to the member by a fixing screw 13.
[0017]
Connecting members 7a and 7b are fixed to the rear end portions of the mirror holding members 15a and 15b by fixing screws 14, respectively. The connecting members 7a and 7b are fastened to the mirror support members 9a and 9b by fixing screws 10, respectively. Before that, as shown in FIG. 5, the extending portions 9c and 9d of the mirror support members 9a and 9b are connected. Rotating the adjusting screw 11 that is screwed into the screw hole formed in the upper surface of the mirror holding member 15a and 15b and abuts against the lower surface of each mounting portion of the mirror holding members 15a and 15b. The position of is adjusted. For this reason, the long holes 9e and 9f formed in the mirror support members 9a and 9b and through which the fixing screw 10 passes are formed so that the same direction is the longitudinal direction.
[0018]
The mirror holding members 15a and 15b, the connecting members 7a and 7b, and the fixture 6 correspond to the mirror holding means, the mirror support members 9a and 9b correspond to the first mirror support means, and the mirror support member 17 and The mirror fixing member 16 corresponds to the second mirror support means.
[0019]
In the rear projection image display apparatus 1 configured as described above, a correction method for distortion removal of the reflection mirror 4 by the image distortion correction mechanism that holds the reflection mirror 4 will be described below. 6 and 7 show the relationship between the distortion of the reflecting mirror 4 and the distortion of the image on the screen 5, and are used for explaining the correction method for distortion removal.
[0020]
In FIG. 6A, a normal state in which the reflection mirror 4 is not distorted is indicated by a dotted line 31 ′, and an example in which each part is bent is indicated by a solid line 31. Similarly, in FIG. 6B, in the video on the screen 5, a normal video area without distortion is indicated by a dotted line 30 ′, and an example in which each part is distorted is indicated by a solid line 30.
[0021]
In the rear projection image display device 1 shown in FIG. 1, when a rectangular image is projected from the projection device 2 and the position of the image is adjusted to the optimum position using the position adjuster 3, FIG. When image distortion (pin distortion) 30a occurs in the upper side portion of the screen 5 shown in b), this distortion is caused by its own weight in the upper side portion which is the long side of the reflecting mirror 4, as shown in FIG. This is due to the occurrence of the deflection 31a.
[0022]
The adjustment method for correcting the deflection 31a is performed by turning the adjustment screw 21 in a state where the fixing screw 20 shown in FIG. 4 is temporarily fixed. Since the mirror support member 17 is provided with a long hole 17a, the adjustment screw 21 is adjusted so that the mirror support member 17 moves in the direction of arrow D in FIG. 6) can be eliminated, and thereby the image distortion (pin distortion) 30a generated on the upper side of the screen 5 can be removed.
[0023]
6B. When the deflection 31b shown in FIG. 6A occurs on both sides of the reflecting mirror 4, image distortion 30b occurs on both sides of the screen 5 as shown in FIG. Accordingly, since both sides of the reflection mirror 4 are held along the mirror holding members 15a and 15b, both sides of the reflection mirror 4 are not bent by their own weight as shown in FIG.
[0024]
Next, as shown in FIG. 7 (a), when the reflecting mirror 4 is deviated 31e from the same plane at one end as shown in FIG. 7 (a), the unequal sides generated on the screen 5 as shown in FIG. A method for removing the trapezoidal distortion 30e will be described.
[0025]
In FIG. 7A, a normal state in which the reflection mirror 4 is not distorted is indicated by a dotted line 31 ′, and an example in which one end is off the same plane is indicated by a solid line 31. Similarly, in FIG. 7B, in the image on the screen 5, a normal image area without distortion is indicated by a dotted line 30 ′, and an example of distortion caused by the above-described dislocation 31 e of the reflection mirror 4 is indicated by a solid line 30.
[0026]
The unequal trapezoidal distortion 30e generated in the screen 5 shown in FIG. 7 (b) is caused by the occurrence of a deviation 31e from the same plane at the end of the reflecting mirror 4, as shown in FIG. 7 (a). ing. The adjustment method for correcting the dislocation 31e is to turn the adjustment screw 11 in a state where the fixing screw 10 for fastening the connecting member 7b (see FIG. 1) and the mirror support member 9b shown in FIG. 5 is temporarily fixed. Is done by. Therefore, the lower left fixing screw 10 (fastening the connecting member 7b and the mirror support member 9b) of the reflecting mirror 4 is loosened, and the lower end of the reflecting mirror 4 is moved to the arrows E and F so that the image is optimized on the screen 5. Move in the direction (Fig. 5).
[0027]
At this time, if the adjustment screw 11 is adjusted in the direction in which the mirror holding member 15b is pressed, the reflection mirror 4 is raised, and if the adjustment screw 11 is moved in the opposite direction, the reflection mirror 4 is lowered by its own weight. When the direction of distortion is opposite, the adjustment screw 11 on the opposite side is adjusted in the same manner. By correcting the flatness of the reflecting mirror 4 by this operation, the unequal trapezoidal distortion 30e generated on the screen 5 can be removed.
[0028]
In the above-described embodiment, the adjustment screw 21 is rotatably held by the frame 18 and is configured to be screwed with the mirror support members 17a and 17b. However, the present invention is not limited to this. Various aspects such as a configuration may be adopted.
[0029]
As described above, according to the rear projection type image display device of the present embodiment, it is possible to correct the deflection of the reflection mirror 4 or the reflection surface from the same plane by a simple adjustment. It is possible to project a high-quality image without any image on the screen.
[0030]
【The invention's effect】
According to the present invention, image distortion caused by a reflection mirror in a rear projection image display apparatus can be removed with a simple and inexpensive configuration and with an easy adjustment method. In addition, in a multi-configuration, a sense of unity with adjacent screens can be obtained, and a comfortable large screen display can be achieved.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a configuration of a main part of a rear projection image display apparatus 1 employing an image distortion correction mechanism according to the present invention.
FIG. 2 is an exploded perspective view of an image distortion correction mechanism that corrects image distortion while attaching the reflection mirror 4 to the upper part inside the cabinet 8;
FIG. 3 is an explanatory diagram showing an example in which the rear projection type image display device 1 is configured as a multi-projector that forms one large screen by overlapping vertically and horizontally.
FIG. 4 is a cross-sectional view of a main part when a portion that supports the reflection mirror 4 on the upper side is viewed from the AA direction (FIG. 1).
FIG. 5 is a cross-sectional view of a main part when a part supporting the reflecting mirror 4 at the lower side is viewed from the BB direction (FIG. 1).
FIG. 6 is a diagram illustrating the relationship between the distortion of the reflection mirror 4 and the distortion of the image on the screen 5, and is used for explaining the correction method for distortion removal.
FIG. 7 is a diagram illustrating the relationship between the distortion of the reflection mirror 4 and the distortion of the image on the screen 5, and is a diagram for explaining a correction method for distortion removal.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rear projection type image display apparatus, 2 Projection apparatus, 3 Position adjuster, 4 Reflecting mirror, 5 Screen, 6 Fixing bracket, 7a, 7b Connecting member, 8 Cabinet, 9a, 9b Mirror support member, 9c, 9d Extension part 9e, 9f long hole, 10 fixing screw, 11 adjusting screw, 12 frame, 13 fixing screw, 14 fixing screw, 15a, 15b mirror holding member, 16 mirror fixing member, 17 mirror supporting member, 17a long hole, 18 frame, 19 fixing screws, 20 fixing screws, 21 adjusting screws.

Claims (5)

In the image distortion correction mechanism of the rear projection type image display device that changes the optical path of the image from the projection device by a rectangular reflection mirror and projects it from the back onto the screen.
A pair of mirror holding portions for holding both sides of the reflecting mirror over the entire side,
A pair of connecting members fixed to one end of the mirror holding portion;
A pair of plane adjusting means disposed on a base and acting on each of the pair of connecting members to support the one end portion so as to be displaceable in a direction substantially perpendicular to a reflection plane of the reflection mirror. An image distortion correction mechanism for a rear projection type image display device.   Furthermore, it is arranged on the base and acts on the substantially central portion of the free side located on the other end side of the mirror holding means among the remaining sides of the reflecting mirror to hold the central portion displaceably. 2. The image distortion correcting mechanism for a rear projection image display device according to claim 1, further comprising a deflection correcting means for performing the operation. The plane adjusting means is
A first mirror support means fixed to the substrate and restricting movement of the reflection mirror along the reflection plane and allowing displacement in a direction perpendicular to the reflection plane;
2. The rear projection type image display device according to claim 1, further comprising: an adjustment screw that is screwed into a screw hole formed in the first mirror support means so that a front end portion is in contact with the mirror holding means. Video distortion correction mechanism. The deflection correcting means is
An adjustment screw rotatably held on the base body;
3. A rear projection type image display apparatus according to claim 2, further comprising: a second mirror support unit which is formed with a screw hole to be screwed with the adjustment screw and holds a substantially central portion of the free side. Video distortion correction mechanism. A rear projection type image display apparatus having the image distortion correcting mechanism according to any one of claims 1 to 4 and having an outside constituted by a screen and a cabinet,
A projection device disposed at the bottom of the cabinet and outputting a projected image upward;
A reflection mirror that is held at an angle inclined with respect to the vertical direction of the screen by the image distortion correction mechanism and changes an optical path of the projected image;
A rear projection type image display device configured to project a projection image output from the projection device onto the back surface of the screen through the reflection mirror.

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