JPH0442834Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roll-up screen for projection, in which the screen is pulled out and used, and rolled up and stored when not in use.

[Problems to be solved by conventional techniques and ideas]

In a conventional winding screen, a screen fixing groove having a wedge-shaped cross section is formed in the longitudinal direction of the winding core pipe, and one end of the screen is inserted into the screen fixing groove and wound.

For this reason, when the screen is strongly rolled up, distortion tends to occur on the screen surface where the corner edges of the screen fixing grooves are located, and in severe cases, horizontal stripes appear periodically.

Particularly in the case of high-brightness screens, which have recently become in demand, distortion becomes even more noticeable, and a solution to this problem has been desired.

[Means for solving problems]

The present invention solves these drawbacks, and its structure will be described in detail with reference to the accompanying drawings as follows.

One end of the screen 2 is fixed to the winding core pipe 1,
In a roll-up type screen in which the screen 2 is wound around the winding core pipe 1 when not in use, the fastening part 4 of the screen 2 to the screen fastening groove 3 of the winding core pipe 1 is made of a thin metal plate having elasticity, and both sides are used. It is characterized in that a protective band plate 5 whose edge line is not straight but has a shape that goes in and out is attached in the length direction so as to span both the upper surface of the screen 2 and the upper surface of the core pipe 1. .

For example, a thin stainless steel plate with zigzag-shaped edges on both sides may be used as the protective band plate 5.

[Effect]

The elastic repulsive force of the protective band plate 5 prevents the screen 2 from being strongly pressed against the corner edge 3' of the screen fixing groove 3.

〔Example〕

The protective strip 5 in the drawing is made of a sawtooth-cut stainless steel thin plate (any other elastic metal-like thin plate such as steel thin plate may be used), but it may have a wavy or other shape.

Although the drawing shows a case in which the hook-shaped bent edge of the screen 2 is hooked to one of the screen fixing grooves 3, various methods of fixing the screen can be designed.

[Effect of idea]

Since the present invention is constructed as described above, when the screen is rolled up and stored around the core pipe when not in use, even if the screen is tightly wound around the core pipe, a protective band plate is attached to the part where the screen attaches to the core pipe. Since the screen is wound through this protective strip, it is possible to disperse the stress concentrated at the corner edges of the screen fastening groove, and it is also possible to reduce the stress that concentrates on the corner edges of the screen fastening groove. Even if there is a problem, this protective strip changes the level difference into a smooth surface, so the elastic repulsive force of the protective strip prevents the screen surface from being pressed against the edge of the screen fixing groove or the edge of the screen tip. Therefore, it is possible to prevent the phenomenon that distortion occurs.

In this case, the protective strip uses an extremely thin metal sheet of about 30 to 100 μm, and the edges are formed in a shape that goes in and out, so there is no distortion at the edges of the protective strip itself, and the high-brightness screen Even if the screen is distorted, horizontal stripes will not be visible, making it a highly practical roll-up screen that can provide clearer images.

[Brief explanation of the drawing]

The drawing is a partial perspective view. 1... core pipe, 2... screen, 3...
Screen fixing groove, 4...fixing part, 5...protective band plate.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a roll-up type screen in which one end of the screen is fixed to the core pipe and the screen is wound around the core pipe when not in use, the screen fixing groove of the core pipe is At the fixing part of the screen, a protective band plate made of a thin metal plate with elasticity and whose edges are not straight but has a shape that goes in and out is installed in the longitudinal direction so as to span both the top surface of the screen and the top surface of the core pipe. A winding screen characterized by being affixed to. 2. The winding screen according to claim 1 of the utility model registration, in which the protective band plate is made of a thin stainless steel plate with zigzag lines on both sides.