JPH02163731A - Reflection type screen - Google Patents

Abstract

PURPOSE:To improve the contrast of a reflection type screen whose accuracy is high and which has a prescribed horizontal visual field by arranging many light transmissive strands in a sheet state and forming a reflecting layer on the back side thereof and an outside light absorbing layer on a non-condensing part thereof. CONSTITUTION:An acrylic resin or the like is used as the light transmissive strand 10. Then, the titanium oxide of 2wt.% is mixed in the reflecting layer 13 on the back surface thereof and the carbon black of 3wt.% is mixed in the outside light absorbing layer 14. Besides, strands obtained by spinning such as conjugate spinning which is 0.4mm in diameter is used. The reflection type screen is made by integrating the strands 10 in a sheet state directly under the spinning. At this time, by controlling the posture of the strands so that the boundary of the reflecting layer 13 is faced to a main observation point and making them adhere or fuse so as to make them in a sheet state, the range of the visual field in a horizontal direction is made wide and the contrast is improved by the high-accuracy light transmissive strand and the outside light absorbing layer 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a reflective screen used as a projection television screen or a screen for various projectors.

(Prior technology) Reflective screens have been used for a long time, and simple ones with cloth or boards wrapped around them have been put into practical use, but recently reflective screens have been used in relatively small rooms. There is a need for a function to widen the field of view in the horizontal direction, and it is also desirable to be able to use it even in bright rooms.

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, in the reflective screen Ic equipped with lenticular lenses as described above, the pitch of the lenses has recently become finer in order to increase the resolution, and it has become difficult to manufacture lenticular lenses. Things are getting harder and busier.

Furthermore, since this type of screen is often used in bright rooms, there is a strong demand for minimizing the influence of external light and increasing contrast.

In view of this situation, the present invention uses translucent strands to provide a high-precision, predetermined horizontal viewing range, and also absorbs unnecessary external light to provide a reflective type with high contrast. It is intended to provide a screen.

(Means for solving the problems) That is, the present invention aims to solve the above problems,
The purpose of this is to form a sheet by arranging a large number of translucent strands, form a reflective layer on the back side of the sheet, and form an external light absorbing layer on the non-light condensing area on the back side. This can be achieved with a reflective screen.

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.

FIG. 1 shows the most typical embodiment of the present invention, in which (10) is a translucent strand, and (20) is a light condensing part provided on the back of the translucent strand (10). Reflective layer, (
30) is an external light absorbing layer made of a black-colored adhesive that binds these translucent strands (10), which are arranged in a sheet shape as shown.

The translucent strand (10) used in the present invention includes:
Use plastic or glass with good light transmittancebc)f'L
Examples of the former include thermoplastic polymers such as acrylic polymers, polycarbonate polymers, polyarylates, crosslinked curable polymers such as crosslinked silicone polymers, crosslinked arylate polymers, and ionic crosslinked polymers. Translucent strands (10
) may be of a single composition, or may be a strand in which a core composition is 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 it is generally 01~
A value of about 1.5 sq. 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 coloring agent, or may be mixed with a light diffusing agent.

Such a translucent strand (10) is prepared according to a conventional method.
For example, plastic materials can be obtained by melt spinning, and a large number of the resulting translucent strands (10) can be arranged and fixed into a sheet using an appropriate adhesive or adhesive tape. can. Further, by making full use of the melt spinning method, a large number of strands may be melt-spun, the strands may be fused together immediately below the spinning to form a sheet, and this sheet or a plurality of sheets may be further adhered to form a sheet. Figure 2 shows a state in which the translucent strands (10) are fused to each other.
) are integrated by a molten layer (11) between them.

Although the reflective layer (20) in this example is formed of a partially vacuum-deposited film of aluminum or the like, it may also be formed of a reflective paint.

The example shown in FIG. 3 is constructed by attaching the screen shown in FIG. 1 to a back plate.The back plate is (40) and is made of wood, plastic, metal, or the like. Note that the reflective layer (20) and external light absorbing layer (30) are the same as in the example of FIG. 1, except that the translucent strand (10) at this time has an oval cross section.

FIGS. 4 and 5 show still another embodiment of the present invention, in which a reflective layer and an external light absorbing layer are provided on the back side of each light-transmitting strand, which are arranged in a sheet shape. This is an example of a configuration.

In other words, most of the translucent strand (10) is the translucent part (
12), the remaining back side is a reflective layer (15) and an external light absorbing layer (1
The reflective layer (13) is a white diffuse reflective layer made by mixing, for example, 2% by weight of titanium oxide into the plastic, and the external light absorbing layer (14) is made by mixing a black pigment into the plastic. It consists of layers.

Such a light-transmitting strand (10) is produced by composite spinning (or conjugate spinning), which is one of the plastic melt-spinning techniques, and consists of a component that becomes the light-transmitting part (12) and a reflective layer (15). It can be obtained by simultaneously spinning a component that will become the external light absorbing layer (14) and a component that will become the external light absorbing layer (14). The obtained translucent strands (10) may be arranged and fixed in a sheet form using an adhesive or adhesive tape, or they may be fused to each other immediately under the spinning process to form a sheet during melt spinning in the same way as described above. It is also possible to use one or more of these to form a screen. When such a translucent strand (10) is used, the interface of the reflective layer (13) becomes more complicated depending on the part of the screen, that is, as the distance from the center of the screen increases, the interface gradually becomes closer to the main observation point (generally the center). It is desirable to form a sheet by controlling the orientation of each strand so that the translucent strands are shaped like a sheet. good.

An example of this is shown in FIG. 6, which shows R and G.

B This is a top view showing the configuration of an E-tube horizontal inline type projection TV, in which each translucent strand unit of the rightmost reflective screen is located from the center of the screen to both ends i/(1, -). , (accordingly, the rotational direction of each translucent strand (1G) unit is determined from the main M viewpoint (B)
They are aligned by sequential posture control so that their optical axes point in the direction of.

In this way, the light emitted from the central projection lens position (A) is
The orientation of each reflective surface is set in the midway direction between (A) and (B), that is, the bisector, so that the optical axis points toward the main viewing point (B) when hitting the reflective surface of each translucent strand unit. It should face directly in the direction of .

Specific Example A reflective screen was manufactured using the translucent strands shown in FIGS. 4 and 5.

Acrylic resin with a refraction of $1.49 is used as the translucent strand, titanium oxide (2 weight width) is mixed into the reflective layer, and Capo:/Black (3 weight width) is mixed into the external light absorbing WIC. The diameter of the conjugate obtained by spinning was 0.
The 4m one was m-.

The translucent strands were then integrated into a sheet just below the spinning to obtain the reflective screen shown in the figure.

The screen thus obtained had the translucent strands arranged accurately, had desired characteristics, and had high contrast.

(Effects of the Invention) Since the present invention has the configuration as described in detail above, a reflective screen can be easily obtained using highly accurate translucent strands, and this screen can It has the advantage of exhibiting excellent optical properties and having a high contrast due to the presence of the external light absorption layer.

[Brief explanation of the drawing]

Figures 1 to 4 are enlarged sectional views showing a part of a reflective screen showing an embodiment of the present invention, Figure 5 is a perspective view of a part of the reflective screen, and Figure 6 is a perspective view of a part of the reflective screen. FIG. 2 is a partially omitted plan view of the device assuming a usage state showing an example of the above. (10)...Translucent strand (20), (13)...Reflection layer (5o),
(14)...External light absorbing layer patent applicant Mitsubishi Rayon Co., Ltd. agent Patent attorney Toshio Yoshizawa

Claims (1)

[Claims] 1. 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, and a non-light-concentrating portion on the back surface absorbs external light. A reflective screen characterized by the formation of layers. 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. The reflective screen according to claim 1 or 2, wherein the reflective layer and/or the external light absorbing layer are formed as part of the back surface of each light-transmitting strand. 4. Claim 1, characterized in that the orientation of the optical axes of the individual translucent strands is controlled and arranged so that they face the main observation point from the center to both ends of the screen surface. , the reflective screen according to item 2 or 3.