JPH0713277A - Video projector - Google Patents

Abstract

PURPOSE:To provide a video projector capable of switching for projecting both successive videos on two screens and superimposed videos and capable of restraining the distortion of a video to a minimum in either case. CONSTITUTION:This projector can project the successive videos on the two screens and the superimposed videos by means of the two projecting machines (1, 2), deflecting plane mirrors (5, 7) capable of deflecting light in two directions and fixed plane mirrors (9-12) for projecting reflected luminous fluxes in the two directions towards a body to be projected are arranged in positions which are symmetrical with respect to a video center line (20), so that an interval between virtual projection outputting points (A1, B1) by means of two projecting machines (1, 2) can be kept wider than the interval between the virtual projection outputting points (A2, B2).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video projection device,
More specifically, the present invention relates to a multi-type image projection device capable of projecting two images in parallel on a spherical or cylindrical screen.

[0002]

2. Description of the Related Art Up to now, a wide screen image has been obtained by projecting two screens in parallel on a spherical or cylindrical surface type screen (projection object), or a stereoscopic image can be produced by superimposing two screens. Although there is a demand for the realization of a video projection apparatus that can switch and project as needed, the following components are required for that. That is, two projectors are required to project two screens, and in order to make the projected screens continuous or overlap on the screen with these projectors fixed, for example, By providing a plane mirror for reflecting the light flux from the projector in such a direction,
Moreover, it is necessary to change the reflection direction of the plane mirror.

2A and 2B show a tentative plan as an image projection apparatus based on the above concept.

It should be noted that (A) shows the state of the optical path when two screens are projected continuously in the lateral direction, and (B) shows the state of the optical path when two screens are projected in an overlapping manner.
In these figures, 11 and 12 are the first and second
Projector, 13 is a spherical screen (in this example, the scale is 1 /
10 images are projected) 14 center of curvature,
15 is rotatably held around a rotation shaft 16, (A)
Alternatively, a plane reflecting mirror 17 capable of changing its orientation to the direction shown in FIG. 7B is held rotatably around a rotation shaft 18, and its orientation can be changed symmetrically with the plane reflecting mirror 15. It is a plane mirror.

In the case of this example, the first projector 11 and the second projector 11
The projector 12 is fixed so that both optical axes thereof are on the same line so as to face each other, the rotating shafts 16 and 18 are parallel to each other, and the image center line 2 including the center of curvature 13 is provided.
With respect to 0, the first projector 11, the reflecting mirror 15 and its rotating shaft 16 and the second projector 12, the reflecting mirror 17 and its rotating shaft 18 are arranged at symmetrical positions. Further, in (A), 21A is a continuous image projected on the spherical screen 14 by the first projector 11 and the second projector 12, and in FIG. The combined images are shown respectively. Furthermore, R is the radius of curvature of the spherical screen 14, 19A
Is the optical axis of the light beam projected from the first projector 11, and 19B is the optical axis of the light beam projected from the second projector 12.

[0006]

However, in the case of the configuration as described above, the image formed by the two screens projected on the spherical screen 14 is used as the center of curvature 1.
When observed in the vicinity of 3, the continuous image shown in FIG. 2A is shown in FIG. 3A, and the superimposed image shown in FIG. 2B is shown in FIG. As shown in B), the image is distorted. In particular, it has been found that such a distortion has a problem that a satisfactory image cannot be obtained because the shapes of the distortions of two overlapping screens are different in the case of a superimposed image as shown in FIG. 3B. .

Moreover, such distortion is caused by (A) in FIG.
In (B), the image center line 20 is passed through the center of curvature 13.
The intersection of the line orthogonal to and the optical axes 19A and 19B at 13
A and 13B, these intersections 13A, 13B
B becomes smaller as it approaches the center of curvature 13, but it is impossible to satisfy this both projections of (A) and (B). However, in order to approach such a condition, the first projector 11 can be used when projecting (A).
The distance between the projection output point from the projector and the projection output point from the second projector 12 should be kept as large as possible, and the distance between the projection output points should be kept as small as possible during the projection of (B). It is desirable to do.

The object of the present invention is to solve the above-mentioned problems, and it is possible to switch the projection of both continuous and superposed images, and suppress distortion in both images to a minimum. An object of the present invention is to provide a video projection device capable of doing so.

[0009]

In order to achieve such an object, the present invention provides two spherical or cylindrical surface-shaped projection objects which are arranged at symmetrical positions with respect to an image center line including the center of curvature thereof. An image projection device capable of projecting a continuous image of two screens and a superimposed image of two screens by a projector, wherein each of the luminous fluxes projected from each of the projectors is symmetrical with respect to the image center line in two directions. And a first deflecting plane mirror for projecting the light beams reflected from the deflecting plane mirror in the two directions toward the projection target.
And a second fixed plane mirror at the image centerline symmetrical position, and the continuous image or the superimposed image can be projected by a combination of the deflection plane mirror and the first and second fixed plane mirrors. It is characterized in that the interval between the virtual projection output points by the two projectors is made wider when projecting the continuous image than when projecting the superimposed image.

[0010]

According to the present invention, a spherical surface or a cylindrical surface is formed by the combination of the deflecting plane mirrors and the first and second fixed plane mirrors in which the light beams projected from the two projectors are arranged at the image center line symmetrical positions. A superimposed image or continuous image is formed by projecting onto a planar projection object. In this case, the virtual projection output points from the two projectors are closer to each other than the continuous image when projected. By setting the direction of the deflecting plane mirror and the positions of the first and second fixed plane mirrors so that the projection state is kept wider, an image with less distortion can be obtained.

[0011]

Embodiments of the present invention will be described in detail and specifically below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. here,
Reference numerals 1 and 2 are first and second projectors, and 5 is a flat reflecting mirror (hereinafter, referred to as a first deflection reflection mirror) that is rotatable about a rotation axis 6 and is displaceable between a position indicated by a solid line and a position indicated by a broken line. Called a mirror),
Reference numeral 7 is a plane reflecting mirror (hereinafter, referred to as a second deflecting reflecting mirror) that rotates about a rotation shaft 8 and can be displaced between a position indicated by a solid line and a position indicated by a broken line. Further, 9 and 10 are fixed plane reflections provided for projecting the light flux reflected from the first projector 1 via the first deflection mirror 5 toward a spherical (or cylindrical surface) screen (not shown). Mirrors 11 and 12 are fixed plane reflecting mirrors provided for projecting the light flux reflected from the second projector 2 through the second deflecting reflecting mirror 7 further toward the screen.

With the image projection device thus configured,
First, when projecting a continuous screen toward a spherical or cylindrical screen (not shown), the first turning mirror 5 and the second turning mirror 7 are set at the positions indicated by the broken lines. Thus, the light flux emitted from the first projector 1 is reflected by the first deflecting reflecting mirror 5 and the fixed plane reflecting mirror 9,
As shown by the optical axis 19A1, projection is performed in the direction in which the virtual projection output point is A1, and the light flux from the second projector 2 is reflected by the second deflection reflecting mirror 7 and the fixed plane reflecting mirror 11, As shown by the optical axis 19B1, projection is performed in a direction in which the virtual light projecting output point is B1. In this case, the distance between the virtual light emission output points A1 and B1 is kept sufficiently large, so that the distortion of the screen on the screen can be suppressed to the minimum.

When projecting superimposed images,
The first turning mirror 5 and the second turning mirror 7 are set at the positions indicated by the solid lines. Thus, the light beam output from the first projector 1 is reflected by the first deflecting reflecting mirror 5 and the fixed plane reflecting mirror 10 and projected in a direction in which the virtual projection output point is A2 as indicated by the optical axis 19A2. You can Similarly, the output light flux from the second projector 2 is projected in the direction in which the virtual light projection output point is B2 as indicated by the optical axis 19B2, whereby the virtual light projection output points A2 and B2 are projected.
The distance between them can be kept small, and the distortion of the image when projecting the superimposed image can be suppressed to a minimum.

In this embodiment also, the first projector 1
And the second projector 2, the rotating shaft 6 and the first deflecting reflecting mirror 5, the rotating shaft 8 and the second deflecting reflecting mirror 7, and the fixed plane reflecting mirrors 9 and 1.
1, the fixed plane reflectors 10 and 12 are respectively the image center line 2
0 and the rotation axes 6 and 8 are parallel to each other, and the rotation axes 6 and 8 and the reflecting mirror 5,
The mirror surfaces 7, 9, 10, 11, and 12 are all kept in the direction vertical to the paper surface.

In the embodiment described above, the individual projectors 1 and 2
On the other hand, two fixed plane reflecting mirrors 9, 10 and 11, 12 are provided, respectively, but the deflecting reflecting mirrors 5 and 7 are selected depending on whether continuous image projection or stereoscopic image projection by superposition is selected. With respect to each of the projectors, its position can be displaced at the same time as the change of the position of the fixed plane reflecting mirrors 9 and 10 and the positions of the fixed plane reflecting mirrors 11 and 12 respectively. Each 1
It is also possible to dispose two fixed plane mirrors so that they can be displaced. In this case, it is necessary to provide means for simultaneously displacing the individual plane mirrors.

[0017]

As described above, according to the present invention, two projectors arranged at the image center line symmetrical position including the center of curvature of the spherical or cylindrical surface-shaped object are used. An image projecting device capable of projecting a continuous image of two screens and a superimposed image of two screens, wherein light fluxes projected from the individual projectors are respectively redirected in two directions symmetrical to the image center line. And a second fixed plane mirror for projecting the light fluxes reflected in the two directions from the deflecting plane mirror toward the projection target, respectively. It is provided at a line-symmetrical position and can project the continuous image or the superimposed image by combining the deflecting plane mirror and the first and second fixed plane mirrors, and the virtual projection output point by the two projectors. The space between them is the overlay projection When the continuous image is projected, it is wider than when the continuous image is projected. Therefore, in case of a continuous image of two screens or a stereoscopic image by superimposing two screens on a spherical or cylindrical surface type projection object. Also, it is possible to switch and project with the minimum image distortion.

[Brief description of drawings]

FIG. 1 is an explanatory diagram schematically showing an example of a structure according to the present invention together with its light flux.

FIG. 2 is a state of a light beam when a continuous image is projected toward a spherical projection target by an image projection device using two projectors (A) and a state of a light beam when a stereoscopic image is projected ( It is explanatory drawing which shows each B) typically.

3A and 3B are explanatory diagrams respectively showing a state of image distortion (A) occurring in the case of FIG. 2A and a state of image distortion (B) occurring in the case of FIG. 2B. .

[Explanation of Codes] 1, 2 Projector 5, 7 Turning Reflector 6, 8 Rotating Axis of Turning Reflector 9, 10, 11, 12 Fixed Plane Reflector 13 Center of Curvature of Spherical Screen 14 Spherical Screen 19A1, 19A2, 19B1, 19B2, 19A, 1
9B Optical axis A1, A2, B1, B2 Virtual projection output point 20 Image center line

Front Page Continuation (72) Inventor Ryohei 1-10-3 Kinuta, Setagaya-ku, Tokyo Foundation Lawyer Nichikei Engineering Service (72) Inventor Kenji Ozeki 1-10-3 Kinuta, Setagaya-ku, Tokyo Foundation Law People NCA Engineering Services (72) Inventor Yoshiharu Exit 2-7 Nishiazabu, Minato-ku, Tokyo Stock Company Nak (72) Inventor Shinkichi Sakuma 1-2-7 Nishiazabu Minato-ku, Tokyo Stock Company Inside the Nuck (72) Inventor Takashi Moriwaki 1-2-7 Nishiazabu, Minato-ku, Tokyo Inside the Nak Co., Ltd.

Claims (1)

[Claims] 1. A continuous image of two screens and a superposition of two screens with respect to a spherical or cylindrical surface-shaped projection object by two projectors arranged at image centerline symmetrical positions including the center of curvature thereof. An image projection device capable of projecting an image, comprising: a deflecting plane mirror capable of deflecting and reflecting a light beam projected from each of the projectors in two directions symmetrical with respect to the image centerline; First and second light sources for projecting the light beams reflected from the plane mirror in the two directions toward the projection target, respectively.
Fixed plane mirror at the image center line symmetrical position, and the continuous image or the superimposed image can be projected by the combination of the deflection plane mirror and the first and second fixed plane mirrors. An image projecting apparatus, wherein a distance between virtual projection output points by a projector is set to be wider when the continuous image is projected than when the superimposed image is projected.