JPH05173251A - Multistage type multiprojector - Google Patents

Abstract

PURPOSE:To perform easily and in a short time a work to exchange or disassemble and clean a screen without collapsing pile up of each screen block and to perform high-efficiency maintenance, in an assembled multistage multiprojector. CONSTITUTION:In the multistage type multiprojector wherein screen blocks 12 each having a screen 12A which is mounted to the front of the screen block and on which an image is projected are piled up in a multistage to form a large screen, a screen frame 44 to which each screen 12A is attached is mounted on the front of each screen block 12 in such a way that the screen frame is movable forward and backward in a direction in which it is protruded frontward to the screen block 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a multi-stage multi-projector in which a screen provided in each screen block, which is a constituent element of the multi-stage multi-projector, can be easily attached and detached individually.

[0002]

2. Description of the Related Art There are cases where a plurality of people want to view a numerical or image display at the same time. In such a case, the display screen needs to be large. A projection television is known as a device having a large display screen and capable of large-scale display. However, the size of a projection television is also limited. When displaying a very large image outdoors or in an indoor plaza, it is difficult to use a single screen. Therefore, there is known an apparatus that combines a plurality of screens to obtain a large image. A multi-stage multi-projector is known as an example of such a device. In a multi-stage multi-projector, screen blocks each having a screen attached to the front are stacked in a multi-stage of, for example, 3 × 3, and a plurality of screens are attached to the front of each block (9 screens in the case of 3 × 3). ) A large screen is constructed by combining them. When assembling such a multi-stage multi-projector, a method is adopted in which the screen blocks below are sequentially stacked. Each screen block has its own CRT, and each screen has its own CRT.
The image is projected from, and as a whole of multiple screens,
It is constructed so that an image of one screen can be obtained.
Therefore, it is desirable to make the joint portion between the screens as thin as possible. This is because the continuity of images is impaired. On the other hand, since each screen is detachably attached to the front surface of the screen block, each screen is attached to the front surface of the screen block via the screen frame. As described above, the width of the screen frame in the direction viewed from the front surface of the screen is preferably as narrow as possible in order to maintain the continuity of the screen. Therefore, the screen frame is attached to the screen block from the side by an attaching member such as a screw.

[0003]

However, during maintenance after assembling the multi-stage multi-projector, when replacing each screen mounted on the front surface of each screen block or when disassembling and cleaning,
There is a problem that the replacement work and the disassembly and cleaning work take time. Especially when replacing or disassembling the screen mounted on the front surface of the screen block located near the center, remove the screen block located above it and then remove the screen It was necessary to replace or disassemble and clean. This is because the screen frame for mounting the screen on the front surface of the screen block is mounted from the side of each screen block for the reason described above.

According to the present invention, in a multi-stage multi-projector after assembling, it is possible to easily replace a screen or disassemble and clean the screen in a short time without breaking the stacking of the screen blocks.
An object of the present invention is to provide a multi-stage multi-projector that can efficiently perform maintenance.

[0005]

In order to achieve the above object, a multi-stage type multi-projector of the present invention is a multi-stage multi-projector in which a screen block on which a screen on which an image is projected is mounted is stacked in multiple stages to form a large screen. In the formed multi-stage multi-projector, a screen frame to which each screen is attached is mounted on the front surface of each screen block so as to be movable forward and backward in a direction projecting forward with respect to the screen block.

[0006]

In the present invention, since the screen frame holding each screen has a mechanism for moving the screen frame forward and backward,
At the time of screen replacement work or disassembly / cleaning work, the screen frame mounted on the front surface of the corresponding screen block may be pulled forward with the screen with respect to the screen block. In this state, there is no obstacle around the drawn-out screen frame, which makes it possible to remove or attach the screen from the periphery of the screen frame. After the screen is attached to the screen frame, if the screen frame to which the screen frame is attached is pushed in the screen block direction, the attaching / detaching work of the screen is completed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on the embodiments shown in the accompanying drawings. FIG. 1 is a vertical cross-sectional view of a screen block which is a component of a multi-stage multi-projector according to an embodiment of the present invention, which is taken along the line AA in FIG.
2 is a front view of the screen block according to the embodiment, FIG. 3 is a plan view taken along the arrow B shown in FIG. 2, and FIG. 4 is a main part of the moving mechanism of the screen frame shown at the left end of FIG. FIG. 5 is a partial perspective view of a screen frame which is attached to the tip of the screen frame moving mechanism shown in FIG. 4 and holds the screen, and FIG. 6 is a schematic overall perspective view of the multistage multi-projector. .. As shown in FIG. 6, for example, the multi-stage multi-projector 10 of the present embodiment is constructed by stacking nine rectangular parallelepiped screen blocks 12 in a 3 × 3 multi-stage. A screen 12A is mounted on the front surface of each screen block 12, and the screens 12A are combined in the same plane to form a single screen screen 14.

The multi-stage multi-projector 10 of this embodiment
As shown in FIG. 1, a CRT 18 is built in each of the screen blocks 12 constituting the. In front of the CRT 18, the projection light projected from the CRT is displayed on the screen 1.
An enclosure assembly 16 that guides up to 2A is fixedly arranged with respect to the screen block body 20 that constitutes the outer frame of the screen block 12. Screen 12
A is held by the screen frame 44 and is configured to be able to move forward and backward with respect to the screen block main body 20 in a direction projecting forward (X direction in FIG. 1) by a mechanism described below.

In front of the screen block body 20,
The pair of base plates 22 is the screen block body 2
It is fixed on both sides inside the 0. This base plate 22
As shown in detail in FIG. 4, bearings 23 are mounted on the upper and lower portions of the shaft 23.
6 is slidable in the axial direction. A slide moving body 24 made of, for example, a rod is connected to the rear end of the shaft member 26. These shaft members 2
6 and the slide moving body 24 constitute a slide moving member for moving the screen and the screen frame forward and backward. An unlocking member 28 is fixed to a substantially central portion of the screen moving body 24. The lock releasing member 28 is attached so as to project in the screen direction, and is guided by a guide block 31 fixed to the base plate 22 so as to be movable in the front-rear direction of the screen block 12 together with the screen moving body 24. ing.

On the other hand, in the central portion of the base plate 22,
A roller 42 is attached. The front end side of the drive wire 32 is wound around the roller 42 by a half turn, and the front end portion is attached and fixed to the rear end portion of the slide moving body 24 or the lock release member, and the rear end side of the drive wire 32 is pulled. The slide moving body 24, together with the lock releasing member 28 and the shaft member 26, is configured to project forward with respect to the base plate 22.
As shown in FIG. 3, the base plate 22 is attached to two positions on both sides in front of the screen block body 20, and the slide moving bodies 24 are provided for each of them, so that the slide moving body 24 can be slid. A pair of drive wires 24 is required. Then, as shown in FIG. 3, in order to wind the pair of drive wires 32 using the same wire take-up tool 34, a roller 38 is provided in the middle of one of the drive wires 32 and the pair of drive wires 32 is provided. The rear ends of the drive wires 32, 32 are connected to a wire winding tool 34 arranged behind the screen block body 20.

Next, returning to FIG. 4, the lock mechanism will be described. To limit the movement of the screen frame 44 and the like when the slide moving body 24 is retracted to the maximum rear position and the screen frame 44 attached to the tip side of the shaft member is set to the image projection position together with the screen 12A. A lock member 30 is attached to approximately the center of the base plate 22 so as to be rotatable around a pivot 30A. An engagement protrusion is formed on the front end side of the rotation of the lock member 30, and when the lock release member 28 is retracted to the maximum rear position, the engagement protrusion of the lock member engages with the lock release member 28. It is adapted to engage with the engagement releasing taper surface 28A. Moreover, the lock member 30 is spring-biased in the direction in which the engagement releasing taper surface 28A is constantly pressed.

As shown in FIG. 1, a handle 36 is attached to the wire winding tool 34, and the rear ends of the pair of wires 32, 32 are wound at the same time by rotating the handle. By winding the rear ends of the wires 32, 32, the slide moving body 2 attached to the front end of each wire
4 is slid forward, and at the same time, the lock releasing member 28 also moves forward, and the tip end tapered portion 28A of the lock releasing member 28 pushes the lock member 30 downward to release the lock. Therefore, the slide moving body 2
4, the tip of the shaft member 26 projects forward with respect to the base body 22. The tip of each wire 32 may be attached to the slide moving body 24 or the lock releasing member 28 via the spring 40. By providing the spring 40, even if each of the wires 32, 32 is suddenly subjected to a tensile force due to the rotation of the handle 36, the presence of the coil spring 40 reduces the shock force, and the shaft member 26 can be smoothly moved. The movement can be secured.

The tip end of the shaft member 26, which is pushed forward together with the slide moving body 24, is fixed to the screen frame 44 as shown in FIG. The screen frame 44 includes an outer screen frame 44A and an inner screen frame 44B. The outer screen frame 44A is shaped so as to cover the four sides of the screen 12A, and the inner screen 44B does not necessarily have to be arranged on the four sides of the screen 12A, but may be arranged on two opposite side positions. .. Such an external screen frame 44A,
A screw hole 46 is formed in the internal screen frame 44B, and a screw 48 is screwed into the screw hole 46 to connect the external screen frame 44A and the internal screen frame 44B to hold the screen 12A. Is becoming The screen 12A is composed of, for example, a Fresnel lens and a lenticular lens. In the present embodiment, the sleeve 50 is attached to the rear end edge of the inner screen frame 44B, and the front end of the shaft member 26 is attached to the sleeve 50. It can be moved in any direction.

Each screen block 12 configured as described above has a size of 3 × 3 as shown in FIG. 6, for example.
Screens 12A mounted on the front surface of each screen block 12 stacked in layers or more
Are combined in the same plane to form a single large screen 14. In the multi-stage multi-projector configured in this way, when the screen 12A of a specific screen block is scratched or soiled and the replacement work is to be performed, reach for the screen from the rear of the screen block and touch the screen. The handle 36 of the wire winding tool 34 shown in FIG. 3 is turned to wind up the rear end of the drive wire 32.
Then, the slide moving body 24 attached to the tip of the drive wire 32 advances in a direction projecting forward with respect to the base body 22. At that time, the lock by the lock member 30 is released by the action of the lock release member 28. When the slide moving body 24 moves, the shaft member 26 attached thereto also moves forward in the axial direction, and the screen frame 44 attached to the tip of the slide member 24 is projected to the front side with respect to the screen block body 20.
As a result, the mounting portion of the screw 48 on the external screen frame 44A is exposed, and the worker can easily remove the screw 48 to perform the replacement work or the disassembly cleaning work of the screen 12A.

After the replacement work or the disassembly and cleaning work,
Screen frame 44 to which the screen 12A is attached
Is pushed rearward with respect to the screen block body 20, the shaft member 26 attached to the screen frame 44 is pushed backward, and the lock release member 28 moves backward together with the screen moving body 24. In this case, wire 3
2, 32 are pulled by the screen moving body 24,
The wire winding tool 34 is rotated in the opposite direction to stretch the wound wire. Then, when the screen frame 44 is retracted to a predetermined position, the wires 32, 32 are fully extended and the lock member 30 engages with the tip tapered portion 28A of the unlock member 28, so that the screen 12A is flush with the other screen 12A. (Or, a fixed curved surface) is stably constructed. It should be noted that the present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the present invention. For example, the slide moving body 24 and the shaft member 26 shown in FIG. 4 can be integrally molded. Further, the tip end portion of the shaft member 26 shown in FIG. 5 may be configured not to be attached to the inner screen frame 44B but to be attached to the outer screen frame 44A. Furthermore, in addition to the screw 48, the connection between the external screen frame 44A and the internal screen frame 44B is
It is also possible to connect using other connecting means.

[0016]

As is apparent from the above description, according to the present invention, the multi-stage multi-projector has a mechanism for moving the screen frame holding the screen block forward and backward, so that it is provided on the front surface of the specific screen block. Since the installed screen frame can be projected together with the screen, screen replacement work or disassembly / cleaning work can be performed easily and in a short time without disturbing the stacking of each screen block. Can be significantly improved.

[Brief description of drawings]

1 is a vertical cross-sectional view of a screen block which is a component of a multi-stage multi-projector according to an embodiment of the present invention, and is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a front view of the screen block according to the embodiment.

FIG. 3 is a plan view taken along the arrow B direction shown in FIG.

FIG. 4 is an enlarged view showing a moving mechanism of the screen frame shown at the left end of FIG.

5 is a partial perspective view of a screen frame attached to the tip of the screen frame moving mechanism shown in FIG. 4 and holding the screen.

FIG. 6 is a schematic overall perspective view of a multi-stage multi-projector.

[Explanation of symbols]

 10 ... Multi-stage multi-projector 12 ... Screen block 12A ... Screen 14 ... Screen screen 16 ... Enclosure assembly 18 ... CRT 20 ... Screen block body 22 ... Base plate 24 ... Screen moving body 26 ... Shaft member 28 ... Lock release member 28A ... Taper Part 30 ... Lock member 31 ... Guide block 32 ... Wire 34 ... Wire winding tool 36 ... Handle 38, 42 ... Roller 44 ... Screen frame 44A ... External screen frame 44B ... Internal screen frame

Claims (3)

[Claims] 1. In a multi-stage multi-projector in which screen blocks on which a screen on which an image is projected are mounted are stacked in multiple stages to form a large screen, a screen frame to which each screen is attached is A multi-stage multi-projector mounted on the front surface of the block so that it can move forward and backward in a direction projecting forward with respect to the screen block. 2. The screen frame is attached to a tip of a slide moving member, and the slide moving member is attached to a screen block so as to be movable back and forth.
The multi-stage multi-projector according to claim 1, wherein the slide moving member and the screen frame are configured to move forward in a direction projecting forward with respect to the screen block by pulling the wire from the rear of the screen block. 3. The multi-stage multi-projector according to claim 2, wherein the screen frame is configured to be detachable from the slide moving member.