JPH0456942A - Screen for video projection - Google Patents

Abstract

PURPOSE:To install a screen satisfactorily at a place where no back wall exists by comprising a screen in such a way that supporting bars at both sides of a screen part are set almost perpendicular to the supporting bar under the screen part and are positioned at both sides of the screen part when no screen part is used. CONSTITUTION:When no screen 1 for video projection is used, it is housed in the supporting bars 4, 5 under and at both sides of the screen and also, in a case 2 fixed on a ceiling entirely. In such a case, the supporting bars 5 at both sides of the screen are rotated by 1/4 centering a fulcrum 6 at both sides of the screen part 1 so as to be perpendicular to the supporting bar 4 under the screen, and they are fixed. After that, the screen part 1 is drawn out, and is fixed so as to be used by the supporting bars 5 at both sides. In such a way, it is possible to install the screen for video projection satisfactorily at the place without providing with the back wall.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a screen that reflects images projected by a video projector, movie projector, over-the-top projector, or the like.

2. Description of the Related Art In recent years, with the development of video projectors and other image projection equipment, screens for viewing projected images have been introduced in various fields such as industrial, educational, and home use.

These screens can be roughly divided into two types: fixed type and roll-up type. The roll-up type includes automatic types that use a motor or the like, and manual types that use the elastic force of a spring or the like.

An example of a conventional video projection screen will be described below with reference to the drawings.

FIG. 4 is a configuration diagram of an example of a conventional image projection screen. This image projection screen is of a manual winding type. In FIG. 4, 11 is a screen portion, 12 is a case, 13 is a winding device using elastic force, 14 is a support rod, 15 is a fixing catch, and 16 is a wall surface.

Now, let us consider the case where the image projection screen is changed from an unused state, that is, a state where it is wrapped and stored in the case 12, to a used state. Normally, a downward force is applied to the support rod 14 under the screen, the screen 11 is pulled out to the position in use, and the screen 11 is fixed with the stopper 15. At this time, part of the downward force for pulling out the screen 11 is stored in the winding device 13 as elastic energy.

Next, considering the case where the screen 11 is rolled up from a used state and stored in the case 12, the screen 11 is rolled up by the elastic force of the winding device 13 when the clasp 15 is removed and the screen 11 is set free.

Problems to be Solved by the Invention However, the image projection screen having the configuration shown in Figure 4 was designed with the assumption that it would be installed on a wall, and it is difficult to install it in a place where there is no wall behind it. There are some inconveniences when doing so.

First, it is not possible to attach a stopper 15 to fix it in the state of use. Second, when installing the screen in a place where there is no wall behind it, the screen may shake due to the effects of air convection, etc.
This causes negative effects such as defocusing of the image. It is highly anticipated that in the future it will be necessary to install a screen in a place without a wall behind it, so there will be a need for an image projection screen that takes into consideration installation in such a place.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an image projection screen that eliminates the above-mentioned inconveniences and can be conveniently installed in a place without a wall behind it.

Means for Solving the Problems In order to achieve this object, the image projection screen of the present invention adds support rods on both sides of the screen to the conventional image projection screen, and when not in use, the screen part,
Both the support rods are housed in a case.

Function: This configuration allows the screen to be fixed in the operating position without using a wall or other clasp, and also prevents the screen from shaking due to air convection, making it suitable even when installed in a location with no wall behind it. It can be used for.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of an image projection screen according to the present invention. FIG. 2 is a perspective view of this image projection screen when not in use, and FIG. 3 is a front view of the main parts. In the figure, 1 is a screen part, 2 is a case, 3 is a winding device using elastic force, 4 is a support rod under the screen, and 5 is a support rod on both sides of the screen. As shown in FIG. 3, the support rod 5 is attached at one end to the case 2 so as to be able to rotate by a quarter.

Now, the case where this image projection screen is put into use will be explained with reference to FIGS. 1, 2, and 3.

When not in use, the image projection screen 1, together with supporting rods 4 and 5 below the screen and on both sides, are housed in a case 2 fixed to the ceiling as shown in FIG. At this point, the support rods 5 on both sides of the screen are fixed at the position in use, that is, on both sides of the screen portion 1, by turning a quarter turn around the fulcrum 6 so that they are perpendicular to the support rods 4 under the screen. After that, pull out the screen part l,
It is fixed in use by support rods 5 on both sides.

Further, when the image projection screen is in use, it is fixed by the support rods 5 on both sides, so that the shaking of the screen portion 11 due to air convection or the like can be minimized.

When storing this image projection screen in a case, conversely, after storing the screen part, the support rods 5 on both sides are rotated by a quarter turn.

Effects of the Invention As described above, according to the present invention, an image projection screen can be satisfactorily installed in a place where there is no wall behind it, and its practical effects are extremely great.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the image projection screen of the present invention, FIG. 2 is a perspective view of this image projection screen when not in use, FIG. 3 is a front view of the main part of the screen, and FIG. The figure is a configuration diagram of an example of a conventional image projection screen. 1... Screen part, 2... Case,
3. Old... Hoisting device using elastic force, 4...
... Support rod under the screen, 5 ... Support rods on both sides of the screen, 11 ... Screen part.

Claims (1)

[Claims] A screen part that reflects the projected image, a winding device that winds up the screen part by the force of a spring, a support rod at the bottom of the screen, a support rod rotatably attached to both sides of the screen part, and a screen part and its winding device. It is constituted by a case that can accommodate support rods on both sides, and when the screen portion is not in use, the support rods on both sides of the screen portion are stored in the case approximately parallel to the support rods under the screen, and when the screen portion is not in use. 1. An image projection screen characterized by being substantially perpendicular to a support rod at the bottom of the screen and located on both sides of the screen when the screen is in a state of being closed.