JPH05103286A - Projector - Google Patents

Abstract

PURPOSE:To obtain a means which permits the superimposing part of a picture projected on one screen by means of plural projectors to have the same brightness as that of another part. CONSTITUTION:The length of luminous fluxes 4a and 4b in the X direction when they are respectively projected from exit pupils 2a1 and 2b1 is defined as R, the length of a light shielding plate 3 in the X direction is defined as r1, distance from the exit pupils 2a1 and 2b1 to the light shielding plate 3 in the X direction is defined as r2, distance from the exit pupils 2a1 and 2b1 to a screen 1 in the Y direction is defined as 11 and distance from the exit pupils 2a1 and 2b1 to the light shielding plate 3 in the Y direction is defined as 12. These lengths and distances satisfy the relation of 11/12=1+r1/(R+2r2).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector configured to form an image as a whole by forming images from a plurality of projection units on a single screen.

[0002]

2. Description of the Related Art Currently, there is a high need for large-screen display devices in order to perform various presentations, product displays, etc. more effectively. In response to this need, a projector is one effective means. is there. However, when a large-screen display device is configured with one projector, the problem is that the entire device becomes huge. In order to solve this problem, a projector has been devised which is configured so that images from a plurality of projection units are formed on one screen to obtain one image as a whole.

However, as disclosed in Japanese Patent Laid-Open No. 62-195948, in the conventional projector technique, the joint portion of a plurality of images is overlapped and the processing of the overlap portion is performed as an image signal. Since this is performed by processing, the system configuration becomes complicated and there is a problem in terms of cost.

Further, in the case of optically processing the overlap portion, it is difficult to design the shape of the device and select the material by the conventional technique as disclosed in Japanese Utility Model Laid-Open No. 62-6733. ..

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to
A means to make the brightness of the overlapped part similar to the other parts,
It is an object of the present invention to provide a projector that can be realized by an optical device having a simple structure and can reduce the cost as compared with the related art.

[0006]

As means for solving the above problems, in the present invention, a light shielding plate corresponding to the number of projection units or a wall surface of a cabinet in which the projection units are installed is used.

[0007]

According to the present invention, the brightness of the overlap portion can be made the same as that of other portions, and the cost can be reduced as compared with the prior art.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a first embodiment of the present invention.
FIG. 6 is a top view when a projection unit that projects three beams of green and blue using the same lens is used.

In FIG. 1, 1 is a screen, 2a and 2b.
Is a projection unit for projecting three beams of red, green and blue using the same lens, 2a1 and 2b1 are exit pupils of the projection units 2a and 2b, 3 is a light shielding plate, 4a and 4b are projection units 2a and 2a, respectively. Luminous flux emitted from 2b, 5a, 5
b is a portion which becomes a shadow when the light beams 4a and 4b emitted from the projection units 2a and 2b are shielded by the light shielding plate 3, respectively, and the point P is on the screen 1 at the same distance from the projection units 2a and 2b. Show points.

In FIG. 1, X of the exit pupils 2a1 and 2b1.
The length in the direction is R, the length in the X direction of the light shield plate 3 is r1, and the distance in the X direction from the exit pupils 2a1 and 2b1 to the light shield plate 3 is r.
2, the distance in the Y direction from the exit pupils 2a1 and 2b1 to the screen 1 is l1, and the distance in the Y direction from the exit pupils 2a1 and 2b1 to the screen side front surface of the light shielding plate 3 is l2. At this time, the above R, r1, r2, l1 and l2 satisfy the following relationship.

[0011]

## EQU1 ## l1 / l2 = 1 + r1 / (R + 2r2) (1) FIG. 2 shows the projection units 2a and 2b, the light shield plate 3, and the projection unit 2 in FIG.
It is a top view explaining the operating principle of a 1st Example using light flux 4a, 4b and shadow 5a, 5b.

FIG. 2 (a) shows a light beam 4 generated by the light shield plate 3.
Points Q1 and Q2 are points at which light beams 4a and 4b are imaged on the screen 1 at the limit, where the optical paths a and 4b are not obstructed. (B) shows a state where half of the optical paths of the light beams 4a and 4b are blocked by the light shielding plate 3,
At that time, the image forming point of the light beams 4a and 4b on the screen 1 is the point P shown in FIG. (C) shows a state in which the light shielding plate 3 blocks all of the optical path of the light beam 4a.

In FIGS. 2A, 2B, and 2C, when the light beams 4a and 4b are overlapped, the state shown in FIG. Next, a light beam 4a,
4b, when the light path is gradually obstructed and each light quantity becomes just half of the state in which the light path is not obstructed by the light shielding plate 3, an image is formed at point P as shown in (b), and the total light quantity is shown. Becomes equal to the value when the light beam 4a or 4b does not obstruct the optical path. Further, when the light shielding plate 3 blocks all of the optical path of the light beam 4a, the image forming point of the light beam 4a moves further on the screen 1 in the right direction from the point P toward the paper surface. Here, according to the condition of Expression (1), the luminous flux 4
The image forming point of a is Q2 as the limit value. Therefore Q2
The total amount of light at a point is equal to the value when the light beam 4a or 4b does not obstruct the optical path. The same thing can be said for the Q1 point. Also, Q1, Q on the screen 1
By satisfying the condition of the expression (1) even between the two, the total light amount becomes equal to the value in the state where the light flux 4a or 4b does not obstruct the optical path. Therefore, the light beams 4a and 4b are over.
The screen brightness of the wrapping part becomes equal to that of the other part.

FIG. 3 shows a second embodiment of the present invention,
FIG. 6 is a top view of a projection unit that projects red, green, and blue beams using independent lenses.

In FIG. 3, 1 is a screen, 2c, 2
f is a projection tube for projecting a blue beam, 2d and 2g are projection tubes for projecting a green beam, 2e and 2h are projection tubes for projecting a red beam, and point P is equal to the projection tubes 2d and 2g. Indicates a point on screen 1 at a distance.

FIG. 4 is a top view explaining the operation principle of the second embodiment of the present invention by using the projection tubes 2c and 2f for projecting a blue beam.

In FIG. 4, 1 is a screen, 2c, 2
f is a projection tube for projecting a blue beam, 2c1 and 2f1 are exit pupils of the projection tubes 2c and 2f, 3a and 3b are light-shielding plates, 4
c and 4d are light beams emitted from the exit pupils 2c1 and 2f1, and 5c and 5d are portions which become shadows when the light beams 4c and 4d are blocked by the light blocking plates 3a and 3b, respectively.
Is the length of the exit pupils 2c1, 2f1 in the X direction, r1 is the distance in the X direction between the ends of the light blocking plates 3a, 3b, r2 is the distance in the X direction from the exit pupils 2c1, 2f1 to the light blocking plates 3a, 3b, respectively. l1 is a screen 1 from the exit pupils 2c1 and 2f1.
In the Y direction, l2 is the distance in the Y direction from the exit pupils 2c1, 2f1 to the light blocking plates 3a, 3b, and P is a point on the screen 1 at the same distance from the projection tubes 2d, 2g in FIG. , Mb points indicate points on the screen 1 that are equidistant from the projection tubes 2c and 2f. At this time, R, r1, r
2, 11, and 12 are set so as to satisfy the equation (1), and the screen brightness of the overlapping portions of the light beams 4c and 4d becomes equal to that of the other portions, as in the above description. Also, the green beam projection units 2d and 2g and the red beam projection tubes 2e and 2h.
Is also the same.

In FIG. 3, in the second embodiment, red,
The system for projecting green and blue beams from each single projection tube was shown, but this content is also applicable to the system for projecting red, green, and blue beams from multiple projection tubes. Similarly to, the screen brightness of the portion where the light flux overlaps becomes equal to that of the other portions.

FIG. 5 shows a third embodiment of the present invention.
Red, green, and blue beams are projected using independent lenses, respectively, and a red and blue projection tube centered on green is a top view when the projection unit is installed on the same side. is there.

In FIG. 5, 1 is a screen, 2c, 2
f is a projection tube for projecting a blue beam, 2d and 2g are projection tubes for projecting a green beam, 2e and 2h are projection tubes for projecting a red beam, and point P is equal to the projection tubes 2d and 2g. Indicates a point on screen 1 at a distance.

FIG. 6 is a top view explaining the operation principle of the third embodiment of the present invention by using the projection tubes 2c and 2f for projecting a blue beam.

In FIG. 6, 1 is a screen, 2c, 2
f is a projection tube for projecting a blue beam, 2c1 and 2f1 are exit pupils of the projection tubes 2c and 2f, 3a and 3b are light-shielding plates, 4
c and 4d are light beams emitted from the exit pupils 2c1 and 2f1, and 5c and 5d are portions which become shadows when the light beams 4c and 4d are blocked by the light blocking plates 3a and 3b, respectively.
Is the length of the exit pupils 2c1, 2f1 in the X direction, r1 is the distance in the X direction between the ends of the light blocking plates 3a, 3b, r2 is the distance in the X direction from the exit pupils 2c1, 2f1 to the light blocking plates 3a, 3b, respectively. l1 is a screen 1 from the exit pupils 2c1 and 2f1.
In the Y direction, l2 is the distance in the Y direction from the exit pupils 2c1, 2f1 to the light blocking plates 3a, 3b, and point P is a point on the screen 1 at the same distance from the projection units 2c, 2f. At this time, R, r1, r2, 11, and 12 are set so as to satisfy the equation (1), and the screen brightness of the overlapping portions of the light beams 4c and 4d is the same as that described above. Is equal to the part. Also, the green beam projection unit 2
The same applies to d, 2g and red beam projection tubes 2e, 2h.

Here, in FIGS. 3 and 5, the ratio of the light quantity of the luminous flux at a certain point of the overlap portion is shown by the left projection tube (2c, 2d, 2e) and the right projection tube (2f, 2f) toward the paper surface. Compare with 2g, 2h).

In the case of the second embodiment in FIG. 3, the midpoint of the blue projection tubes 2c and 2f and the red projection tubes 2e and 2h on the screen 1 is different from the point P. Therefore, the left projection tube (2c, 2d, 2e) at a certain point of the overlap portion,
The ratio of the light quantity of the light flux of the right projection tube (2f, 2g, 2h) is
Different for each color (red, green, blue).

On the other hand, in the case of the third embodiment in FIG.
The midpoints of the blue projection tubes 2c and 2f and the red projection tubes 2e and 2h on the screen 1 coincide with the point P. Therefore, the left projection tube (2c, 2d, 2) at a certain point of the overlap portion.
The ratio of the light amount of the luminous flux of the right projection tube (2f, 2g, 2h) is the same for each color (red, green, blue), and the influence on the occurrence of color unevenness due to the viewing angle can be eliminated.

FIG. 7 is a perspective view of the fourth embodiment of the present invention, in which 6 is a cabinet, 6a, 6b, 6c, 6d, 6
Reference numeral e is a wall surface of the cabinet, and 2i is a projection unit.

In FIG. 7, in the third embodiment, the projection unit 2i is installed in the cabinet 6, and the projection unit 2i
It is characterized in that the front surface in the projection direction of i is opened.

FIG. 8 is a perspective view of the fifth embodiment of the present invention, in which 6 is a cabinet, 6a, 6b, 6c, 6d, 6
Reference numerals e and 6f are cabinet wall surfaces, and 2i is a projection unit. However, it is assumed that 6f is made of a material that can transmit a light beam.

In FIG. 8, in the fourth embodiment, the projection unit 2i is installed in the cabinet 6, and the projection unit 2i
It is characterized in that the front surface in the projection direction of i is made of a material capable of transmitting a light beam.

FIG. 9 is a top view of the fourth or fifth embodiment of the present invention in a working state, where 1 is a screen and 2 is a screen.
Is a projection unit, and 6 is a cabinet.

As shown in FIG. 9, by disposing a plurality of cabinets 6 in which the projection units 2 are installed,
A screen with a large screen can be configured. here,
The projection unit 2, the cabinet 6, and the screen 1 are configured so that the expression (1) is established. At this time, the necessary adjustments between the cabinet 6 and the screen 1 are to make the positions of the cabinets 6 in the Y direction equal, and to set the distance from the cabinets 6 to the screen 1 in the Y direction. Will only be.

FIG. 10 is a top view of the sixth embodiment of the present invention, in which 1 is a screen, 2 is a projection unit, 6 is a cabinet, and 7 is a space for fixing the screen to the cabinet. Shows the server.

In FIG. 10, by using the spacer 7, the screen 1 is removed from each cabinet 6 described above.
Can be set in the Y direction, and the only adjustment necessary to satisfy the equation (1) is to make the Y positions of the cabinets 6 equal.
This can be dealt with by providing each cabinet 6 with a positioning pin or the like.

Although FIG. 10 shows the embodiment of three sets of projectors, the same can be realized when three or more sets of projectors are used.

[0035]

According to the present invention, the means for making the overlapping portion of the image projected on one screen by a plurality of projectors the same brightness as the other portions is simple. This can be realized by an optical device having a structure, and the cost can be reduced as compared with the related art.

[Brief description of drawings]

FIG. 1 is a top view of a first embodiment of the present invention,

FIG. 2 is a top view for explaining the operation principle of the first embodiment of the present invention,

FIG. 3 is a top view of the second embodiment of the present invention,

FIG. 4 is a top view explaining the operation principle of the second embodiment of the present invention,

FIG. 5 is a top view of the third embodiment of the present invention,

FIG. 6 is a top view explaining the operation principle of the third embodiment of the present invention,

FIG. 7 is a perspective view of a fourth embodiment of the present invention,

FIG. 8 is a perspective view of a fifth embodiment of the present invention,

FIG. 9 is a top view of the fourth or fifth embodiment of the present invention in a working state,

FIG. 10 is a top view of the sixth embodiment of the present invention.

[Explanation of symbols]

1 ... Screen, 2, 2a, 2b, 2c, 2d, 2
e, 2f, 2g, 2h, 2i ... Projection unit 2a1,
2b1, 2c1, 2f1 ... Exit pupil, 3, 3a, 3
b ... light-shielding plate, 4a, 4b, 4c, 4d ... luminous flux, 5
a, 5b, 5c, 5d ... A portion where the light beam is shaded by the light shielding plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mutsuji Asano Mutsuji Asano, 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Stock Company, Institute for Video Media Research, Hitachi, Ltd. Hitachi Media Imaging Laboratory

Claims (5)

[Claims] 1. A plurality of projection units, wherein the projection units are arranged in a line so that the projection directions are the same in the same plane and there is no other projection unit on the front surface in the projection direction. A plurality of images projected from the unit are formed so as to form an overlapping portion between the images on one screen installed on the front surface of the projection unit in the projection direction. In the projector, the image brightness of the overlap portion is made equal to that of other image portions by using a light shielding plate. 2. A plurality of projection units, wherein the projection units are arranged in a matrix so that the projection directions are the same in the same plane and there is no other projection unit on the front surface in the projection direction. A plurality of images projected from the projection unit are placed between the images on a single screen installed in front of the projection units in the projection direction.
In a projector configured to form an image with a overlap portion, the image brightness of the overlap portion is made equal to that of other image portions by using a light shielding plate. 3. A plurality of projection units installed in a cabinet, wherein the projection units are arranged in a line so that the projection directions are the same in the same plane and there is no other projection unit on the front surface in the projection direction. A plurality of images projected from each projection unit are imaged with an overlap portion between each image on one screen installed in front of each projection unit in the projection direction. 2. The projector according to claim 1, wherein the image brightness of the overlap portion is made equal to that of other image portions by using the wall surface of the cabinet. 4. A plurality of projection units installed in a cabinet, wherein the projection units are arranged in a matrix so that the projection directions are the same in the same plane and there is no other projection unit on the front surface in the exit direction. A plurality of images projected from each of the projection units are formed with an overlap portion between the images on one screen installed on the front surface in the projection direction of each projection unit. 2. The projector according to claim 1, wherein the image brightness of the overlap portion is made equal to that of other image portions by using the wall surface of the cabinet. 5. The projection unit according to claim 1, 2, 3 or 4, wherein the projection units are configured to independently project red, green and blue luminous fluxes, respectively, between adjacent projection units. A projector in which red, green, and blue projection tubes are arranged so that red and blue are on the same side with green as the center.