JPH0470824A - Image projection screen - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image projection screen for projecting an image by reflecting an image projected by a video projector, movie projector, overlapping projector, or the like.

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

These screens can be roughly divided into fixed types and roll-up types, and the roll-up types include automatic types that use a motor, etc., and manual types, such as those that use the elastic force of a spring.

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 roll-up type. In FIG. 4, the screen part 11, the screen part storage case 122, and the winding device 1 using elastic force.
3. Support rod 14. It is composed of a fixing stopper 16.

Now, let us consider a case where the image projection screen 11 is changed from an unused state, that is, a state where it is rolled up and stored in the screen storage case 12, to a used state. A downward force is applied to a support rod 14 usually attached to the bottom of the screen 11, the screen 11 is pulled out to a position in use, and is fixed with a stopper 16. 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 is rolled up from a used state and stored in a case, the screen is rolled up by the elastic force of the winding device 13 when the clasp 15 is removed and the screen is left in a free state.

Problems to be Solved by the Invention However, the image projection screen having the configuration shown in Fig. 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. Sometimes some inconveniences arise.

First, when the case 7 is in a high position, a pull rod is required to pull the screen out.

Second, even if you try to fix it in use, you can't attach the clasp.

Third, when the screen is installed in a place without a wall behind it, the screen shakes due to air convection, causing negative effects such as defocusing the image.

It is highly anticipated that in the future it will be necessary to install a screen in a location without a wall behind it, so there will be a need for an image projection screen that takes into consideration installation in such a location.

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 is provided by adding several rod-shaped weights to the image projection screen, and applying downward force due to the weights at the position of the screen in use. and the elastic force of the winding device.

Function: This configuration eliminates the need for a separate pulling rod when pulling the screen out of the case of the screen storage compartment located at a high position, and allows the screen to be fixed in the use position without using a catch. It also prevents the screen from shaking due to air convection, etc., and can be used well even when installed in a place where there is no wall behind it.

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. In other words, as shown in the figure, the null part 1
．． Screen storage case 2. Hoisting device using elastic force 3. Support rod4. The rod-shaped weight 62-layer hook is composed of a metal fitting e.

Now, the case where this image projection NuClean is put into use will be described below. FIG. 2 is an external view of the Eirin projection screen when it is not in use, and FIG. 3 is a conceptual diagram of the image projection screen when it is in use. When not in use, the image projection screen 1 is housed and fixed in a screen storage case 2 fixed to the ceiling as shown in FIG. Here, the heavy hook is a bar-like weight on the metal fitting 6! When 116 is applied, the screen is pulled out by gravity until the weight of the weight and the elastic force of the hoisting device 3 are balanced, and the screen comes to rest. By making this bar-shaped weight of sufficient length and weight, the operation of hanging the weight on the metal fitting e becomes very easy. In this manner, the image projection screen is in a used state and is fixed in this state by the balance between the elastic force of the winding device and the weight of the weight, so no separate fixing clasp is required.

Furthermore, when the image projection screen 1 is in use, a downward force due to the rod-shaped weight 6 and an upward force due to the elastic force of the hoisting device 3 are acting on the screen 1, so that the screen 1 is affected by air convection, etc. The shaking can be made very small.

When storing the image projection NuClean 1 in the case 2, it can be easily stored in the screen storage case 2 by applying a slight upward force.

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 large.

[Brief explanation of the drawing]

Fig. 1 is an actual configuration diagram of the image projection screen of the present invention, Fig. 2 is an external view of this image projection screen when not in use, and Fig. 3 is an illustration of this image projection screen. FIG. 4 is a conceptual diagram showing the configuration of an example of a conventional image projection screen when in use. 1... Screen part, 2... Screen part storage case, 3... Winding device using elastic force, 4... Support rod, 6... ...Bar-shaped weight, 6...The weight is a metal fitting. Name of agent: Patent attorney Shigetaka Awano and 1 other person f-
--Also, Freen Shokai 4---4 Dobo 5-・Honban-1ii, Su6--J94-tei LIT 1st.

Claims (1)

[Claims] A screen unit that reflects a projected image on the front surface, a winding device that winds up the screen unit using the force of a spring, a case that houses the screen unit, and a support rod provided at the bottom of the screen unit and its support. An image projection screen equipped with several rod-shaped weights attached to a rod.