JP2001296602A - Back projection type display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a back projection type display to be moved without dividing it, so as not to require much labor for assembling. SOLUTION: The back projection type display, in which a screen 1 and a reflection mirror 2 are arranged at an upper cabinet 5 and a projector 4, is arranged at a lower cabinet 6, is provided with holding means 8, 9 for moving the reflection mirror 2 from a projection position which is arranged obliquely to the rear of the upper cabinet 5 and vertically holding it. Further, the lower cabinet 6 is formed to a size capable of being housed in a space in the upper cabinet 5 generated, when the mirror 2 is moved backwards and is held vertically. When the mirror is moved, the lower cabinet 6 is housed in the space, and after moving the display can be assembled by raising the upper cabinet 5, so that the back projection type display can be moved without being divided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear projection display which can easily expand and contract the overall height for convenient transportation.

[0002]

2. Description of the Related Art As a display having a screen size exceeding 50 inches, there is a rear projection display.

A rear projection display is shown in FIG.
As shown in (b), a transmissive screen (hereinafter, referred to as a screen) 1 is arranged on the front of the cabinet, and the screen 1 and the reflection surface face each other behind the screen, and the reflection is inclined upward toward the screen 1. A mirror 2 is arranged, and a projector 4 is arranged below the cabinet (for example,
In the drawing, the projection port 3 is directed upward and obliquely rearward), and the image from the projector 4 is reflected by the reflection mirror 2 and projected on the screen 1.

In general, in such a rear projection type display, when the screen 1 is 60 inches, the total height is about 1.8 m, and when the screen 1 is 70 inches, the total height is the focal length of the projector 4 and the projection lens used. In many cases, the distance exceeds 2.0 m.

Incidentally, the effective size (W × H) of the screen 1 in the case of the aspect ratio of 4: 3 is 121.9 cm × 91.4 cm for the screen 1 of 60 inches, and is 71.7 cm.
At 0 inches, the size is 142.2 cm × 106.7 cm.

[0006] Therefore, when such a rear projection display is transported, the height of the luggage carrier of a transport wagon is only about 125 cm, so that a rear projection display exceeding 60 inches cannot be mounted on the luggage carrier. Was.

Also, the height of a door of a general building is about 2 m, and many of them are lower than this, so that it is difficult to move the large-sized display as described above.

As one method for solving this problem, the rear projection display is divided into an upper cabinet and a lower cabinet so that they can be transported separately.

[0009]

However, in the case where the upper cabinet and the lower cabinet are divided as described above, several people are required to separate the upper cabinet and the lower cabinet. Further, at that time, if the upper cabinet and the lower cabinet are separated, the inside is exposed, so that the inside cabinet is easily damaged and requires careful attention so as not to break.

[0010] In addition, the transportation is complicated because the handling of the load becomes two pieces. At this time, since the lower cabinet is provided with casters, it is relatively easy to move. However, since the upper cabinet cannot be provided with casters, it was necessary to carry it by hand or prepare a cart.

On the other hand, when assembling, positioning and confirmation of the optical axis are required due to the division, so that there has been a problem that special labor is required.

An object of the present invention is to make it possible to move a rear-projection display without dividing it so as to save time and effort in moving and assembling.

[0013]

In order to solve the above-mentioned problems, according to the present invention, a transmissive screen is arranged at the front of an upper cabinet, the screen and the reflection surface are opposed to the rear of the screen, and the upper part is located at the upper part. In the rear projection type display that arranges a reflection mirror inclined on the screen side, and arranges a projector in the lower cabinet, and projects an image from the projector to a transmission screen via the reflection mirror, in the upper cabinet,
Holding means for vertically moving the reflection mirror by moving it forward or backward of the upper cabinet is provided. On the other hand, the lower cabinet is provided with a reflection mirror vertically held in front of or behind the upper cabinet by the holding means and the upper cabinet. The configuration is such that it is formed in a shape that can be accommodated behind or between the screen and the upper cabinet, and a slide mechanism that raises and lowers the upper cabinet is provided.

By adopting such a configuration, when the inclined reflecting mirror of the upper cabinet is moved to the front or the rear of the upper cabinet by the holding means and held vertically, the reflecting mirror which is vertically raised and the upper cabinet are moved. Since a space is created between the rear part or between the reflection mirror and the screen, the upper cabinet can be lowered into the space to accommodate the lower cabinet, and the total height can be reduced by the lower cabinet. Also,
After moving, the rear projection display can be assembled in the original state by raising the upper cabinet and tilting the reflection mirror.

At this time, if a structure having a damper between the upper cabinet and the lower cabinet is adopted, the lowering speed of the upper cabinet can be controlled by canceling the weight of the upper cabinet with the damper.

At this time, if the slide mechanism is constituted by a guide channel and a guide roller which moves to the guide channel, the upper cabinet can be smoothly moved up and down by the guide roller.

Further, if a configuration in which damper means is provided on the reflection mirror is adopted, the movement of the reflection mirror can be performed safely.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the rear projection display of the present invention comprises an upper cabinet 5 and a lower cabinet 6.

As shown in FIG. 2, the upper cabinet 5 has a structure in which a transmission screen (screen) 1 is arranged on the front surface and a reflection mirror 2 inclined behind the transmission screen 1 is provided. Is the upper cabinet 5
And protrudes from a notch 7 provided on the rear surface of the camera. The notch 7 is provided with a cover member a that can be opened and closed to prevent intrusion of external light and dust.
As shown in FIGS. 2 and 3, the bent portion provided at the tip engages with the reflection mirror 2 and covers the cutout portion 7.

The reflection mirror 2 is of a surface reflection type, and is held by holding means comprising an upper groove 8 and a rear groove 9 provided on the inner walls on both sides of the upper cabinet with the reflection surface facing the screen 1.

As shown in FIG. 2, the upper groove 8 is a guide groove provided above the inner wall from the front to the rear end. In this groove, for example, a roller-shaped pin is provided above the reflection mirror 2. It is provided and engaged.

On the other hand, the rear groove 9 is a guide groove provided from the middle of the rear end of the inner wall to the lower part. For example, a roller pin is provided in the middle of the reflection mirror 2 to engage with the groove. As a result, as shown by the arrow in FIG.
When the upper portion of the reflecting mirror 2 is moved rearward along the upper groove 8 while being lowered along the reflecting mirror 2, the reflecting mirror 2 can be raised almost vertically. By raising the reflection mirror 2 vertically in this manner, a space for accommodating the lower cabinet 6 is formed between the raised reflection mirror 2 and the screen 1.

On the other hand, the lower cabinet 6 is formed in such a size that it can fit into the space formed between the reflection mirror 2 and the screen 1, and the projector 4 disposed inside faces from the upper opening. ing.

That is, the projector 4 is disposed obliquely rearward with the projection opening 3 facing upward.
As shown in (1), the optical axis f of the projector 4 is aligned with the center axis of the screen 1 via the oblique reflection mirror 2 of the upper cabinet 5.

The upper cabinet 5 and the lower cabinet 6 are provided with a slide mechanism 10 for moving the upper cabinet 5 up and down.

The slide mechanism 10 includes the upper cabinet 5
And two guide channels 10a attached to both inner walls on both sides of the lower cabinet 6 and guide rollers 10b attached to both sides of the lower cabinet 6. The guide rollers 10b of the lower cabinet 6 are attached to the guide channels 10a of the upper cabinet 5. By engaging,
The upper cabinet 5 can be moved up and down smoothly.

At this time, the slide mechanism 10 is provided with a lock mechanism so that the upper cabinet 5 does not inadvertently move up and down.

Further, a damper 11 is provided between the upper cabinet 5 and the lower cabinet 6. The damper 11 uses a gas spring in this embodiment.

The gas spring uses the reaction force of the high-pressure gas sealed in the cylinder tube as a spring.
A small spring constant can be obtained with a large initial load, and the lifting speed can be controlled. for that reason,
The cylinder tube of the gas spring is attached to the upper cabinet 5, the piston rod is attached to the lower cabinet 6, and the gas spring is attached in the direction (compression) to cancel the weight of the upper cabinet 5.

The upper cabinet 5 is positioned and fixed vertically by using a separate locking device (not shown).

The small gas spring is also mounted as a damper 13 on the reflection mirror 2.
For example, a cylinder tube of a gas spring is attached to the upper cabinet 5 and the piston rod is connected to the reflection mirror 2.
, The reflection mirror 2 can be easily moved.

Reference numeral 12 is a caster.

This embodiment is configured as described above. In this rear projection display, for example, the projection of the reflection mirror 2 projecting from the rear of the upper cabinet 5 in FIG. After the cover member a is closed after being rotated to be vertical, the lower cabinet 6 is placed between the vertically oriented reflection mirror 2 and the front screen 1.
A space for accommodating is provided.

At this time, the reflecting mirror 2 can be moved safely because the gas spring works as the damper 13.

In this state, the lock for stopping the upper cabinet 5 and the lower cabinet 6 is released, and the upper cabinet 5 is gently lowered to accommodate the lower cabinet 6 as shown in FIG.

At this time, the lowering of the upper cabinet 5
The slide mechanism 10 including the guide channel 10a and the guide roller 10b enables smooth operation.

At this time, since the descending speed is set to an appropriate speed by the damper 11 by the gas spring, the storing operation can be performed smoothly and safely without descending at once.

When the lower cabinet 6 is accommodated in this way, if the screen is, for example, 70 inches or less, the total height can be reduced to, for example, 1.2 m or less. It is easy to move around the building.

Further, since the thus housed product does not require a separating operation, the number of workers is small, and the inside is not exposed even during movement, so that the chance of breaking is small. In addition, since the number of loads handled is one, and it can be moved by casters, it can be easily moved. When moving, the overall height is reduced and the center of gravity is also reduced, so that the movement using the casters 12 has a sense of stability. Furthermore, transportation by a forklift becomes easy.

On the other hand, when returning to the projection state, the upper cabinet 5 is raised to the set position, and the position is held by the lock device. Next, when the upper part of the reflection mirror 2 is pushed into the cabinet, the lower part of the reflection mirror 2 protrudes, and the reflection mirror 2 can be moved in the opposite direction to the previous storage and set to the inclined position. In this manner, assembly can be easily performed without the need for positioning and checking of the optical axis.

At this time, the reflection mirror 2 can be moved safely because the gas spring works as the damper 13. After that, the projection is completed because the cover member a is engaged with the protruding portion and covers the cutout portion 7.

The upper cabinet 5 can be smoothly lifted by the slide mechanism 10 including the guide channel 10a and the guide roller 10b.

At the same time, the damper 1 by the gas spring
1 allows the above work to be performed smoothly and safely.

In this embodiment, the upper groove 8 and the rear groove 9 are used as holding means, but the present invention is not limited to this. The holding means may be, for example, a rail or a link that suspends the reflection mirror 2, or any other means that can move and hold the reflection mirror 2.

FIG. 4 shows a second embodiment.

In this embodiment, an example in which the reflection mirror 2 is moved to the screen 1 will be described.

That is, when the upper cabinet 5 has no space for moving the reflection mirror 2 backward as shown in FIG. 4, for example, the reflection mirror 2 is moved to the front screen 1 side and held vertically.

For this reason, as shown in FIG. 4, for example, the upper groove 8 and the rear groove 9 are formed forward as holding means.

In the case where the reflection mirror 2 is held on the screen 1 side as described above, the screen 1 and the reflection mirror 2 face each other, and there is also an effect that the reflection surface of the reflection mirror 2 and the screen 1 can be protected.

In this embodiment, the dampers 11 and 13 are omitted to make FIG. 4 easier to see. Further, the other configuration and operation and effect are the same as those of the first embodiment, and the description thereof is omitted.

FIG. 5 shows a third embodiment.

In the rear projection type display of this embodiment, a mirror 14 is provided on the lower cabinet 6 so that the first and second mirrors are provided.
The arrangement of the projector 4 of the embodiment is changed (the dampers 11 and 13 are omitted as in the second embodiment).

As described above, it is shown that the rear projection display of the present invention can be applied to the one using a plurality of mirrors 2 and 14.

In this embodiment, the upper cabinet 5
Has the same shape as that of the second embodiment, but is not limited to this. For example, it is apparent that the shape may be as shown in the first embodiment of FIGS.

The arrangement of the projector 4 can be arbitrarily changed by changing the number and arrangement of the mirrors 14, so that the arrangement of the projector 4 is not limited to a horizontal arrangement.

Further, the dampers 11 and 13 are not limited to gas springs, but may be any as long as they function as the dampers 11 and 13.

[0058]

According to the present invention, the lower cabinet can be housed in the upper cabinet as described above, so that the rear projection display can be easily moved without being divided so as to save trouble in moving and assembling. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a longitudinal sectional view of the first embodiment.

FIG. 3 is a longitudinal sectional view showing a stored state of the first embodiment.

FIG. 4 is a longitudinal sectional view of a second embodiment.

FIG. 5 is a longitudinal sectional view of a third embodiment.

6A is a front view of a conventional example. FIG. 6B is a longitudinal sectional view of a conventional example.

[Description of Signs] 1 Transmission screen 2 Reflecting mirror 3 Projection port 4 Projector 5 Upper cabinet 6 Lower cabinet 8 Upper groove 9 Lower groove 10 Slide mechanism 11 Damper 13 Damper 14 Mirror

Claims (4)

[Claims] 1. A transmissive screen is arranged on the front of an upper cabinet, and a reflection mirror is arranged behind the screen such that the screen faces the reflection surface and the upper part is inclined toward the screen. A rear projection display that projects images from the projector to a transmissive screen via a reflection mirror, wherein the reflection mirror is moved to the front or rear of the upper cabinet and held vertically in the upper cabinet. A holding means is provided.On the other hand, the lower cabinet is formed in a shape that can be accommodated between a reflecting mirror vertically held in front of or behind the upper cabinet by the holding means and the rear of the upper cabinet or the screen. Slurs to raise and lower the upper cabinet Rear projection display provided with a de mechanism. 2. The apparatus according to claim 1, further comprising a damper between said upper cabinet and said lower cabinet.
The rear projection display according to 1. 3. The rear projection display according to claim 1, wherein the slide mechanism comprises a guide channel and a guide roller engaged with the guide channel. 4. The rear projection display according to claim 1, wherein a damper is provided on the reflection mirror.