JP3188584B2 - Multi vision - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-vision system in which core units are stacked, and more particularly to a multi-vision system in which image display quality is considered.

[0002]

2. Description of the Related Art In a multi-vision system, a large screen is formed by stacking a plurality of core units. A core unit, which is a unit, transmits a projection unit composed of a projection type cathode ray tube and a projection light from the projection unit. A projection unit composed of an optical system having a lens or the like for guiding the screen, a screen on which the projection light of the projection unit is projected, and a screen unit composed of a screen frame supporting the screen; and positioning the projection unit and the screen unit in place. And a light-shielding storage frame between them. When stacking the core units, it is necessary to stack the core units in such a manner that the brightness becomes constant if the stack is simply stacked, since the brightness becomes uneven.

[0003] As a method of stacking with constant brightness,
Until now, the screen of the core unit stacked in the second stage was tilted forward with respect to the core unit in the first stage, and the core unit installed in the second stage was further stacked in the third stage. The screen of the core unit is inclined forward, and the screen of the core unit stacked in the fourth stage is inclined forward with respect to the core unit installed in the third stage. The main light flux of the image projected from each core unit is focused at a certain distance in front of the screen so that the brightness of the entire screen is constant. As an example of this type of multivision, for example, a projection video apparatus and an assembling apparatus disclosed in Japanese Patent Application Laid-Open No. 4-113789 are known.

[0004]

By the way, in the multi-vision stacked in this way, the screen is inclined forward (downward) for each core unit, so that the upper core unit is inclined at a higher inclination angle. Becomes larger. Therefore, if the relative inclination angle between the core units stacked vertically is θ = 3 °, the inclination angle of the fourth-stage core unit is (4-1) × 3 ° = 9 °, and the fifth-stage core unit becomes The inclination angle of the core unit is (5-1) × 3 ° = 12 °.

As a result, in a core unit having a large inclination angle, the center portion of the screen made of a thin resin material may be bent downward by its own weight. When the screen bends in this way, the bent portion is out of focus and blurred, and the blurred image becomes unclear, and the unclearness results in a significant decrease in image quality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to prevent the screen from being bent, whereby the brightness is constant, the image is clear, and the image quality is improved. It is an object of the present invention to provide a multi-vision of a core unit stacking method which can be increased.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a projection unit which is formed as a single plane in the vertical direction and is inclined at an angle at which the screen does not bend downward. The main luminous flux of the image passed through the center of the corresponding screen, and each projection unit was inclined at a different angle from each other so as to intersect at a point at a preset distance.

[0008]

With this configuration, since the entire screen is formed as one plane in the vertical direction and the screen is inclined at an angle which does not bend downward, it is possible to prevent the image from being blurred due to the bending. Further, since the projection units are inclined at different angles from each other so that the main luminous flux of the image of the projection unit alone intersects at a fixed distance, the brightness becomes constant near the intersection.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a multi-vision of a core unit stacking type according to an embodiment of the present invention,
FIG. 2 is a schematic diagram of a cross section taken along line AA of FIG. 1, and FIG. 3 is an explanatory diagram showing an operation of the multivision shown in FIG.

In these figures, the core unit 1
A multi-vision M is composed of a projection unit 2 and a screen unit 3, three core units 1 stacked vertically and three horizontal units mounted on a gantry 10.

The projection unit 2 includes a cathode ray tube 11, a lens group 12 provided in front of the cathode ray tube 11, and a stand 15 on which electronic circuit boards such as the cathode ray tube 11, a control board of the cathode ray tube 11, and other mechanical parts are mounted. .

The screen unit 3 includes a screen 4
And a screen frame 5 for supporting the screen 4. The screen frame 5 is attached to the front of a frame-shaped storage rack 6 formed on a substantially rectangular parallelepiped. A stud 16 is provided on the storage rack 6, and the table 15 is connected to the storage rack 6 via the stud 16.
Attached to. In addition, a cover 7 for shielding light is provided between the screen unit 3 attached to the storage rack 6 and the projection unit 2.

Each of the core units 1 thus configured
Are stacked vertically and horizontally by 3 units, and each screen 4
Pseudo-forms one plane. Then, it is installed on the gantry 10 at an angle θ0 from the vertical direction. The angle θ0 is set in a range in which the screen 4 is bent downward by its own weight and the image is not out of focus in consideration of the position of the monitor 20 and the height of the viewpoint. When the angle of the screen 4 is set in this way, the mounting angle of the projection unit 2 is set in parallel with this. The mounting angles θ1, θ2, and θ3 are the main light fluxes A, B, and C of the first, second, and third-stage projection units 2-1, 2-2, and 2-3. The angle is such that it passes through the central portion of No. 4 and intersects at the viewpoint position of the monitor 20. That is, in FIG. 3, when the distance from the center of the screen 4 of the multi-vision M to the viewpoint of the monitor 20 is L, the intersections of the main light fluxes I, B, and C intersect at G. In this embodiment, studs 16 are provided at first, second, and third stages at different angles so that the main beams A, B, and C intersect at the viewpoint position of the supervisor 20. The stand 15 of each projection unit 2 is engaged with the stud 16 to easily project the projection units 2-1, 2-2, 2-3.
Is performed.

That is, the projection unit 2-1 in the core unit 1 installed in the first row having the above configuration is mounted on the plurality of first studs 16 provided on the storage rack 6 by the table 1.
5, the projection unit 2-2 installed in the second row is tilted by adding θ1 to the tilt angle θ0 of the pseudo screen surface of the screen unit 3.
When the stand 15 is engaged with the second-stage stud 16, the projection unit 2-3 installed in the third-stage row is inclined by adding θ2 to the inclination angle θ0. The angle of inclination θ
The angle is inclined by adding θ3 to 0. These inclination angles θ1, θ
2, and θ3 are set to such an angle that the main luminous fluxes A, B, and C form at least an intersection G near the viewpoint position of the monitor 20. As a result, the brightness of the image of each projection unit 2 appears constant to the eyes of the observer near point G. The fixing of the projection unit 2 to the storage frame 6 is not limited to the stud 16, and other known mechanical fixing means can be used.

At this time, the inclination angles θ1, θ2 and θ3
Of course, it can be understood that the value of the tilt angle θ0 of the set 4 of the screen units can be much wider than that of the screen unit 4 as a matter of course. .

[0016]

As described above, according to the present invention, a plurality of screens on the front of the screen unit form a pseudo-planar screen, and the inclination angle is set to an angle at which the screen does not bend. The projection unit is tilted at different angles so that the main luminous flux of the image of the projection unit alone intersects at a certain distance. By doing so, it is possible to capture the tilt angle in a wide range, thereby making it possible to keep the luminance constant at any point over a wide range, and to obtain a clear and high-quality video.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a multivision according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a cross section taken along line AA of FIG. 1;

FIG. 3 is an explanatory diagram of the operation of the multivision shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core unit 2,2-1,2-2,2-3 Projection unit 3 Screen unit 4 Screen 5 Screen frame 6 Storage frame 7 Cover 10 Frame 11 CRT 15 units 16 Stud M Multivision

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Mitsuo Okimoto 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within the AV Equipment Division, Hitachi, Ltd. (72) Inventor Junichi Ikoma 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa (56) References JP-A-1-263634 (JP, A) JP-A-4-113789 (JP, A) JP-A-3-226082 (JP, A) JP 1-228281 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09F 9/00 H04N 5/68

Claims (4)

(57) [Claims] 1. A screen unit having a screen on a front surface, and a screen unit located behind the screen unit.
A multi-vision system comprising a projection unit for projecting an image on a screen and laminating a plurality of screens of the screen unit to form a large screen, the screen unit so that the screen is positioned on the same plane in the height direction. The screens are stacked, and the screens are tilted at an angle such that the screens do not bend downwards while holding the pseudo-planar plane, and the main luminous flux of each projection unit passes through the center of the screen, and Multi-vision wherein each projection unit is installed at a different angle so as to intersect at a set monitoring position. 2. The multi-vision according to claim 1, wherein said screen unit and said projection unit are respectively fixed to a storage rack. 3. The multi-vision according to claim 2, wherein a plurality of the multi-visions are stacked while being fixed to the storage rack. 4. The multi-vision system according to claim 2, wherein a cover is provided between the rear surface of the screen of the storage rack and the front surface of the projection unit to shield the space between the two.