JPH08201919A - Take-up type screen - Google Patents

Abstract

PURPOSE: To provide a take-up type highly gained screen constituted so that it does not laterally wrinkle. CONSTITUTION: This is the take-up type screen 2 wound round a take-up core 1. As the take-up core 1, the take-up core with level difference 3 whose radius is gradually increased between the position of 0 deg. and the position of 360 deg. and whose difference between the radius at the position of 360 deg. and the radius at the position of 0 deg. becomes (t) is adopted. As the screen 2, the screen whose thickness is the above mentioned (t) and whose flexibility is <=150mm by a hair-pin curve method is adopted. Then, the screen 2 is stuck to the level difference 3 of the core 1 through an adhesive layer 4 and the thickness of the layer 4 is set to be <=80μm.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a winding screen.

[0002]

2. Description of the Related Art Conventionally, a white matte screen having a low gain and a retroreflective screen (using beads) have been mainly used as a winding screen.

By the way, in recent years, liquid crystal projectors have become the mainstream as a projector, and in order to allow viewing even in a bright room, not only the output of the projector is increased, but also the screen tends to have a high gain.

However, when a high-gain screen is used as a winding screen, horizontal wrinkles are generated on the screen due to winding, which causes a problem that the commercial value is impaired.

Details of this point are as follows.

The winding screen 23 used up to now employs, as the winding core 21, a rod body having a circular cross section as shown in FIG. 1 and a groove 22 having a substantially triangular cross section formed in the rod length direction. , The base end of the screen 23 is adhered to the bottom surface of the groove 22 with a predetermined width, and the screen 23 is attached to the corner edge of the groove 22 from the groove 22.
It has a structure in which it is led out through 22a and wound around a winding core 21 (hereinafter referred to as a conventional example).

As a result of various experiments conducted by the present inventor, in the conventional example shown in FIG. 1, the corner edges 22a and 22b of the groove 22 and the opening 22c of the groove 22 are shown.
It was confirmed that when the screen 23 wound up due to the presence of the wrinkles was developed as shown in FIG.
The horizontal wrinkle is a wrinkle caused by the corner edge 22a of the groove 22, the horizontal wrinkle is a wrinkle caused by the opening 22c of the groove 22, and the horizontal wrinkle is a wrinkle caused by the corner edge 22b of the groove 22.

In the case of the above-mentioned screen having a low gain, the horizontal wrinkles B, C, and C are not so noticeable because the screen surface is dark. That is, it does not hinder the viewing. However, in the case of a high gain screen, since the screen surface is bright, these horizontal wrinkles I, R, and C become very conspicuous, which is an obstacle to viewing. SUMMARY OF THE INVENTION The present invention provides a winding screen free from horizontal wrinkles which, when unfolded for the purpose of viewing, does not interfere with the viewing.

[0009]

The gist of the present invention will be described with reference to the accompanying drawings.

A winding screen 2 to be wound around a winding core 1, wherein the winding core 1 is 3 from the 0 ° position.
The radius gradually increases up to the 60 ° position,
The winding core 1 with the step 3 having a difference between the radius at the 0 ° position and the radius at the 0 ° position is t is adopted, and the thickness of the screen 2 is t, and the flexibility of the screen 2 is the hairpin curve method. The screen 2 having a size of 150 mm or less is used, and the screen 2 is attached to the step 3 of the winding core 1 with the adhesive layer 4
The winding screen is characterized in that the thickness of the adhesive layer 4 is set to 80 μm or less.

[0011]

As a result of various experiments, the present inventor has confirmed that if the winding core 1 and the screen 2 having the following structure are adopted, horizontal wrinkles do not exist on the screen 2 at the time of unfolding (FIG. 5).
reference).

The claims of the present invention summarize the results of this experiment.

Winding core 1 ... 360 ° from 0 ° position
The winding core 1 with the step 3 is adopted in which the radius gradually increases up to the position and the difference between the radius at the 360 ° position and the radius at the 0 ° position is t.

Screen 2 ... The thickness is t,
The flexibility of the screen 2 is 150 mm by the hairpin curve method.
The following screen 2 is adopted. When the screen 2 is attached to the step 3 of the winding core 1, the thickness of the adhesive layer 4 is set to 80 μm or less.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 3 to 7 show one embodiment of the present invention, which will be described below.

The structure of the winding core 1 of this embodiment is represented by the following equations (1) and (2) (see FIGS. 3 and 4). Further, the radius R at an arbitrary position when the screen 2 is wound N times around the winding core 1 is represented by the equation (3).
In this example, γ _o = 38 mm.

Γ _θ = γ _ο + (θ / 2π) · t (1) γ _2π = γ _ο + t (2) γ _θ : Rewinding core 1 at an arbitrary angle θ position from γ _ο
Radius (0 ≦ θ ≦ 2π) γ _ο : radius of the winding core 1 at the 0 ° position, that is, the minimum radius γ _2π : radius of the winding core 1 at the 360 ° position t: γ _2π −γ _o , The height of the step 3 of the take-up core 1 and the thickness of the screen 2 R = γ _θ + N · t (3) R: γ _o From the center of the take-up core 1 at an arbitrary angle θ position to the screen 2 Length to surface N: Number of windings of the screen 2, an integer Also, the winding core 1 of this embodiment is formed of a suitable metal such as a suitable synthetic resin or aluminum.

The screen 2 of the present embodiment is a high gain screen using a polarizing plate having a characteristic of 150 mm or less by the hairpin curve method, and its structure is as shown in FIG. ),
50 μm thick PET vapor deposition film B (reflecting material), 30 μm
It has a structure in which a thick PET film C (polarizing material) and a 30 μm thick OPP film D (diffusing material) are bonded together with an appropriate adhesive (total thickness t is 0.4 mm).

Here, the hairpin curve method is the degree of bending (so-called waist) of an arbitrary member depending on the size of the maximum interval h when a part of the member is brought into contact with and folded back as shown in FIG.
It represents.

The screen 2 is attached to the winding core 1
It is attached to the step 3 through an appropriate adhesive. As a result of an experiment, it was confirmed that the adhesive 4 needs to have a thickness of 80 μm or less. If the thickness is 80 μm or more, the presence of the adhesive 4 causes horizontal wrinkles on the screen 2.

Since the present embodiment is constructed as described above, it becomes a high gain screen which does not cause horizontal wrinkles at all even when it is wound and then developed as shown in FIG.

[0022]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is a screen in which lateral wrinkles do not occur at all even when it is rolled and unfolded.

[Brief description of drawings]

FIG. 1 is a side view of a conventional example.

FIG. 2 is a front view of a conventional screen developed.

FIG. 3 is a side view of the present embodiment.

FIG. 4 is a side view of the present embodiment.

FIG. 5 is a front view of the screen according to the present embodiment when it is developed.

FIG. 6 is an explanatory diagram of a hairpin curve method.

FIG. 7 is a structural explanatory view of a screen according to the present embodiment.

[Explanation of symbols]

 1 winding core 2 screen 3 step 4 adhesive layer

Claims (1)

[Claims] 1. A winding screen wound around a winding core, wherein the winding core is 360 ° from the 0 ° position.
The radius gradually increases up to the 360 ° position and becomes 360 °
A winding core with a step is used, in which the difference between the radius of the position and the radius of the 0 ° position is t, and the thickness of the screen is the above t, and the flexibility of the screen is 150 by the hairpin curve method.
A winding screen, characterized in that a screen having a thickness of not more than mm is adopted, the screen is attached to the step of the winding core via an adhesive layer, and the thickness of the adhesive layer is set to 80 μm or less.