JPH02125242A - Reflection type screen - Google Patents

Abstract

PURPOSE:To obtain a reflection type screen in which accuracy is high and the prescribed range of field view is exhibited in the horizontal direction by arranging plural translucent strands so as to form a sheet, and forming a reflecting layer on the back surface of the sheet. CONSTITUTION:As the translucent strand 10, highly light-transmissive plastic or glass is used; with respect to the translucent strand 10, for example, a plastic type is obtained by the melt spinning method; after plural obtained translucent strands 10 are arranged, they can be stuck in the form of a sheet with proper adhesive agent or adhesive tape. As the reflecting layer 20, a mirror plate such as an aluminum sheet can be used, or the one in which a reflecting layer made of aluminum, silver, etc., formed on a plastic sheet can be used. Thus, the reflection type screen can be easily obtained by using the translucent strands with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a reflective screen that is used as a glodivision television screen or various Bronnister screens.

(Prior art) Reflective screens have been used for a long time, and simple ones made of cloth or boards have been put into practical use.
Recently, there has been a demand for a function that widens the field of view in the horizontal direction so that it can be used even in a relatively small room, and it is also desired that it can be used even in a brightly lit room.

For this reason, a reflective screen equipped with a lenticular lens is already known, for example, as disclosed in Japanese Patent Laid-Open No. 55-64228.

(Problem to be Solved by the Invention) However, recently, in a reflective screen equipped with a lenticular lens as described above, F'! In order to improve resolution, the pitch of lenses tends to become finer, making it difficult to manufacture lenticular lenses with high precision.

In consideration of this situation, the present invention has developed a reflective screen that uses translucent strands to provide a highly accurate and predetermined horizontal viewing range, and an easy-to-manufacture reflective screen that is integrated with a sheet. It is intended to provide a screen.

(Means for Solving the Problems) That is, the present invention aims to solve the above-mentioned problem 1r.It is an object of the present invention to arrange a large number of translucent strands to form a sheet, and to This can be achieved by a reflective screen characterized by forming a reflective layer on the portion of the screen, and by adding a strand melt spinning method, we aim to provide a reflective screen with high precision and excellent performance. It is something to do.

Note that the back surface in the present invention refers to another surface of the light-transmitting strand opposite to the incident side, or the back side of each light-transmitting strand itself.

The present invention will be explained below with reference to the drawings.

Figure 1 shows the most typical implementation row of the present invention, in which (10) is a translucent strand and (20) is a plate-shaped reflective layer. A large number of translucent strands (10) are arranged in a sheet shape and fixed to the layer (20).

The translucent strand (10) used in the present invention includes:
Plastic or glass with good light transmittance is used,
Examples of the former group include acrylic polymers, polycarbonate polymers, thermoplastic polymers such as polyarylates, crosslinked silicone polymers, crosslinked arylate polymers, and crosslinked curable polymers such as ionic crosslinked polymers. The light-transmitting strand 0) may be of a single composition, but it may also be a strand in which five compositions are coated with a sheath composition having a lower refractive index, such as in an optical fiber.

The thickness of the translucent strand (10) varies depending on the screen size, use, and purpose, but is generally α1 ~
A material with a t of about 5 mm is selected and can sufficiently contribute to making the screen finer pitch.

Further, the outer surface of the translucent strand (10) may be a smooth surface or may have fine irregularities. Furthermore, this translucent strand (10) may be colored with an appropriate alcohol color or may be mixed with a light diffusing agent.

Such a translucent strand (10) is prepared according to a conventional method.
For example, glass fiber can be obtained by a melt spinning method, and a large number of translucent strands (1 (Nt)) can be obtained by arranging them and attaching them as appropriate using ffl A11 or viscous tape. It can be fixed in a sheet form.Also, by making full use of the melt-spinning method, a large number of strands are melt-spun, and the strands are made to intertwine with each other just under the spinning to form a sheet, and this sheet can be formed into a single sheet or 7t can also be formed by further adhering a plurality of strands.Transparent strand (
Figure 2 shows the state in which the transparent strands (10) Fi, I! i!
It is integrated by fusion 7m (11).

Further, as the reflective layer (20), a mirror plate such as an aluminum sheet may be used, or a plastic sheet coated with an anti-#4 film made of aluminum, silver, or the like may be used. Alternatively, as will be described later, this reflection 1- may be not only specular reflection but also a so-called diffuse reflection layer.

Figure 3 shows another example of the present invention (31t), in which flat translucent strands (10) are arranged in a sheet and fixed to the reflective layer (20). (
10) and the reflective layer (20) can be made of similar materials. In this way, the translucent strand (10
) can have a circular or non-circular cross section, for example, an oval shape, an oval shape, etc.

The reflective screen obtained by the above array reflects the light incident from a predetermined direction on the vaporized film (21) formed on the back of the translucent strand (10), and then diffuses the light and spreads it out again. Ninth, the viewing range can be expanded, but the pitch can be determined by selecting the roundness used for the translucent strand (10)' and the thickness of your choice, as well as fine pitch. It is easy to do this, and the precision of the lens can be improved.

FIGS. 4 and 5 show still another embodiment of the present invention, in which a row is constructed by arranging individual translucent strands with a reflective layer on the back side in a sheet shape. be. That is, 80% of the translucent strand (10) consists of a translucent part (11) and the remaining 20% consists of a reflective part (12), and this reflective part (12) is made of plastic containing, for example, titanium oxide. It is a white diffuse reflection part with a mixture of 2 and 1%.

Such a translucent strand (10) is formed by composite spinning (or conjugate spinning), which is one of the plastic melt spinning techniques, to form a component that will become the translucent part (11) and a component that will become the reflective part 5 (12). It can be obtained by simultaneously spinning the components. Then, the obtained transparent strands (10) may be arranged in a sheet shape and solidified using an eyelid or adhesive tape, but as described above, they are fused to each other immediately under the spinning during bath melt spinning. It may be made into a sheet, and one or more sheets may be used to form a screen. When using such a translucent strand (10), each position is adjusted so that the interface of the reflective part (12) becomes stiffer depending on the part of the screen, that is, the interface gradually moves toward the center as it moves away from the center of the screen. It is desirable to form the strand into a sheet by controlling the process, and this can be done by gradually tilting the translucent strand once produced, or by controlling its posture during melt spinning.

A reflective screen was manufactured using the translucent strands shown in FIGS. 4 and 5, and its optical properties were measured.

The translucent strand was made of acrylic resin with a refractive index of 1.49, and the reflective part was made by compound spinning with titanium oxide (2 mm%) mixed in. The strand had a diameter of 1148 mm.

When a simulation is performed assuming that the light rays from the five tubes R, G, and E of a projection television are incident on the reflective screen obtained in this way at a concentration angle of 8 degrees, the optical path as shown in Figure 6 is created. The optical characteristics of the screen gain as shown in Fig. 7 and Fig. 7 were obtained.

In other words, the optical path diagram in Figure 6 shows that the incident light ray and the outgoing light ray are separated by 180 degrees at the reflective interface, so that the light ray that enters from below exits upward, but in an actual screen, the incident light ray and the The light beam is reflected at the reflective interface and exits from the same surface again. And the spread of this optical path 7th
This can be confirmed by the optical characteristics of the lens, but the viewing angle is ±40
It can be seen that the color balance is extremely bright, and the -jR,/'E curves are also quite excellent. In this example, it has been found that when the viewing angle is too narrow, the ratio of the reflective portion to the transparent portion may be increased, for example, to about 70/301.60/a.o.

(Effects of the Invention) Since the present invention has the number of grooves as detailed above, it can be easily assembled into a reflective screen using highly accurate translucent strands. It has the advantage of being immersed, exhibiting optical properties.

[Brief explanation of drawings]

1 to 4 are enlarged sectional views showing a part of a reflective screen showing an embodiment 1j of the present invention, FIG. 5 is a perspective view of a part of the reflective screen, and FIGS. 6 and 7 are
The figures are an optical path diagram and an optical characteristic diagram for evaluating the performance of the concrete relay of the present invention. (10) Translucent strand (20) Reflective layer Patent applicant Mitsubishi Rayon Co., Ltd. Figure 6 procedural amendment (voluntary) February 27, 1999

Claims (1)

[Scope of Claims] 1. A reflective screen characterized in that a large number of translucent strands are arranged to form a sheet, and a reflective layer is formed on the back surface of the sheet. 2. A patent characterized in that the translucent strands are fused to each other on their outer surfaces and integrated into a sheet, and a screen body is constituted by one or more of these sheets. A reflective screen according to claim 1. 3. Claim 1, characterized in that the reflective layer is formed as part of the back surface of each light-transmitting strand.
The reflective screen according to item 1 or 2.