JPS6017434A - Back projection screen and its manufacture - Google Patents

Abstract

PURPOSE:To improve a contrast by forming a lenticular lens on a light source side of a base material which becomes a screen body, and also forming as one body a film-like substance made of a synthetic resin containing a light absorbing material, on an observation side. CONSTITUTION:A film-like substance 2 made of a synthetic resin of 0.1-0.3mm. thickness containing a light absorbing material (example: carbon black) is placed on an observation side of a base material 1 which consists of a synthetic resin whose light transmitting property is good, such as a methacrylate resin, a polycarbonate resin, etc., and becomes a screen body. Subsequently, a mold of a plate is made to abut on a film-like substance 2 side, also a mold having a mold surface opposite to a lenticular lens is made to abut on a light source side and pressed thermally, the base material 1 and the film-like substance 2 are formed as one body, and also a lenticular lens 11 is formed. Next, a transmitting part A of a light of the film-like substance 2 is removed. In this way, a light absorbing layer which is firm and has a uniform thickness is formed on a non- transmitting part of a light, and a back projection screen whose contrast has been improved is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear projection screen in which a light absorption layer is formed on the viewing side to improve contrast, and a method for manufacturing the same.

Rear projection screens, such as those used in glossy TV screens, are less affected by external light than reflective screens, so they can be used in bright rooms, but they are difficult to use in brighter rooms to display clear images. In order to make this possible, it is recommended to form a light absorption layer on the viewing side to increase the contrast. Screens that form a light absorption layer on the viewing side include those that have a printed layer formed on the surface as disclosed in Japanese Utility Model Application No. 51-145935, and those that form a printing layer on the surface as disclosed in Japanese Patent Application Laid-open No. 49-118422. Those dyed with sex dyes or special public works of 1984-1986
As disclosed in Japanese Patent Publication No. 692 and Japanese Patent Publication No. 52-46693, those made of photosensitive resin are known.

However, when forming a light-absorbing layer by such printing, coating, etc., the layer cannot be made thick enough, and it may come off when touched with hands or when wiped during cleaning. In addition, it is difficult to make the layer thickness uniform, resulting in unevenness in the original absorption capacity and deterioration in appearance.

In view of these circumstances, the present invention is directed to a rear projection screen in which the thickness of the light absorption layer can be made sufficiently thick and the light absorption layer with a uniform thickness can be firmly formed. This is what I did. That is, the gist of the present invention is that a lenticular lens is formed on the light source side of the screen body, and a synthetic resin film containing a light absorbing agent is laminated on the viewing side.
Moreover, the first invention is a rear projection screen characterized in that the light-transmitting part of the film-like material on the observation side is removed, and the rear projection screen is made of a base material serving as the screen body and a synthetic resin film containing a light absorbing agent. 7. At the time of laminating and integrating the shaped objects by heat pressing, the ticular lens is formed on the light source side at the same time.7. C, what about the film-like object on the observation side? The second invention provides a method for manufacturing a rear projection screen 7 characterized by removing the transparent portion of the screen, and when manufacturing the base material that will become the screen body by casting molding, a synthetic resin containing a light absorbing agent is used. A rear projection screen characterized by integrally laminating film-like materials produced by the manufacturer, then shaping a lenticular lens on the light source side by heat pressing, and further removing a light-transmitting portion of the film-like material on the viewing side. A third invention relates to a manufacturing method, in which when manufacturing the base material that becomes the screen body by extrusion bottom shape, a synthetic resin film containing a light absorbing agent is supplied and laminated and integrated, and at the same time or in a subsequent step. According to a fourth aspect of the present invention, there is provided a method for manufacturing a rear projection screen, which is characterized in that a lenticular lens provided on the light source side is shaped, and a light transmitting portion of the film-like material on the observation side is removed. be.

Hereinafter, the present invention will be explained according to embodiments shown in the drawings.

In the figure, (1) is a base material constituting the screen, and a synthetic resin with good light transmittance, such as methacrylic resin, polycarbonate resin, or vinyl chloride resin, is usually used. Further, (2) is a film-like material made of a synthetic resin containing a light absorbing agent, and a light absorbing agent such as carbon black or aniline black is added to a synthetic resin similar to the above or other synthetic resin. Furthermore, this film-like material (2)
C. It is possible to use a so-called film of about 0.1 to 0.3 ynm to a so-called sheet of about 0.3 to 3 mvt, and the thickness is selected according to the purpose.

The most basic manufacturing method of the present invention using such materials and the rear projection screen of the present invention will now be explained based on FIG. That is, FIGS. 1(A) to (C) show an embodiment of the second invention of the present invention, and FIG. 1(A)
(1) and (2) are the above-mentioned base material and film-like material. When such materials are integrated by hot pressing, they are shaped so that the lenticular lenses (11) are exposed on the light source side of the screen body. Such hot pressing can be achieved by using a flat mold on the side of the film-like material (2) and using a mold with a mold surface opposite to that of the lenticular lens on the opposite side. Note that the lenticular lens (11) used at this time is generally one in which a large number of lens units extending in the vertical direction are provided in parallel. R1 The cross-sectional shape of this lens may be circular or non-circular. Figure 1 (B) shows that the film-like material (2) is laminated and the lenticular lens (2) is laminated at the same time.
11) is shown. The present invention
It was manufactured by removing only the original transparent portion (A) of the film-like material (2) integrated in this way. Figure 1 (
The rear projection screen obtained in C) is shown at 9°C, and a film-like material (2) containing a light absorber is integrally bonded to the original non-transparent part (B). Therefore, in this rear projection screen, the light incident from the light source side passes through the transparent part and exits from the viewing side, and performs its function.
A strong, uniformly thick original absorbing layer is formed in the non-light transmitting areas, providing a screen with improved contrast. In this example, the film-like material (2) in the light-transmitting portion (A) can be removed using a scriber or a milling machine. Such removal work may also be carried out by providing appropriate positioning for the base material and tools.

Figures 2 (A) to (D) show another embodiment of the second invention, in which the film-like material (2) is applied to the base material (1) in Figures (A, ) and (B). Lamination and shaping are the same as in the example shown in FIG. In this example, as shown in Figure 2, the observation side is also shaped so that the light-transmitting part (A) is concave and the non-light-transmitting part (B) is convex, and then the same as in Figure 1 is done. The light-transmitting portion (A) of the film-like material (2) is removed to obtain a rear projection screen as shown in FIG. 2(D).

Further, FIGS. 3(A) to 3(C) also show an embodiment of the second invention of the present invention. As shown in the figure (Bl), the lenticular lens (11) is shaped and the unevenness of the opposite surface is shaped, and then the part indicated by the arrow in the figure is cut with a circular saw. In this example, the light transmitting part ( A) is convex, so if you cut it at the arrow point, you will see the transparent part (
The film-like material (2) in A) is removed, and the film-like material (2) in the same figure (C
) A rear projection screen such as P4 is provided.

FIGS. 4(A) and 4(B) show an example of the third invention of the present invention, in which FIG. 4(A) shows a base material (
A state in which a film-like material (2) is laminated on 1) is shown. In addition, in the same figure, (3) is a transparent resin thin layer provided when laminating the film-like material (2).

The original transparent portion (A) in the film-like material (2) is removed in the same manner as in the example shown in Figure 1, and as shown in Figure 4 (B).
A rear projection screen like this is obtained.

Furthermore, FIGS. 5(A) and 5(B) show an embodiment of the fourth invention of the present invention, in which a 7.
The film-like material (2) is laminated and integrated, and at the same time, the lenticular lens (11) is shaped and extruded.
By performing the same operation of removing the original transparent portion (A) as in the example of FIG. 1, a rear projection screen as shown in FIG. 1(B) can be obtained. Of course, in this fourth invention, after the base material (1) and the film-like material (2) are laminated and integrated in the extrusion molding stage, the lenticular lens (11) is shaped by heat pressing or the like, and then It is also possible to obtain a rear projection screen by performing a removal operation similar to that shown in FIG.

Although the embodiments of the first to fourth aspects of the present invention have been described above, the present invention is not limited to these examples, and various modifications are possible. For example, in Fig. 6, a convex lens (12) is provided in the light-transmitting part (A) on the observation side.
Figure 7 shows a concave lens (12) instead of this convex lens (12).
3). A convex lens like this (12
) or by providing a concave lens (13), the directivity can be further improved.

Further, the base material (1) serving as the screen body of the rear projection screen of the present invention may be made of a transparent material, but a diffusing agent may be used as a complementary material. In other words, the diffusing agent is used as the base material (1
) is effective when mixed uniformly with the dispersing agent, for example, 5i02. CaCO2, A7203
．． An inorganic diffusing agent such as Tie, BaSO4, Zn0e glass fine powder or an organic diffusing agent can be used. Further, in order to reduce regular reflection on the surface, fine irregularities may be formed on the observation side (B) surface and/or the projection side (A) surface.

Furthermore, it is effective to install a separate Fresnel lens on the light source side of this rear projection screen to make the screen uniformly bright.

Since the present invention has the configuration as described in detail above, it is possible to provide a rear projection screen with good contrast in which a light absorbing layer of uniform thickness is firmly formed in the non-light transmitting area. It has the advantage of being able to manufacture high-performance rear projection screens efficiently.

[Brief explanation of the drawing]

1 to 3 are partial sectional views showing the manufacturing process of the second invention of the present invention and an embodiment of the first invention, and FIG. 4 shows an embodiment of the third invention of the present invention. Partial cross section, 5th
The figure is a partial cross-sectional view showing a fourth embodiment of the present invention, and FIGS. 6 and 7 are partial cross-sectional views showing still other examples of the rear projection screen of the present invention. (1)...Base material (11).../Ticular lens (12)...
... Convex lens (13) ... Concave lens (2) ... Film-like material (A) ... Transparent part (B) ... Non-transparent part Ice l Diagram 2 Diagram 3 Diagram 2 Resistance I Diagram convex hair 5 Mouth 1 Convex

Claims (1)

[Claims] 1. A lenticular lens is formed on the light source side of the main body of the scuba U-7, and a film-like material made of synthetic resin containing a light absorbing agent is laminated on the observation side, and A rear projection screen characterized in that the original transparent portion of the film-like material on the observation side has been removed. 2. When the base material that will become the screen body and the synthetic resin film containing the light absorbing agent are integrated by heat pressing, a ticular lens is formed on the light source side at the same time, and R on the film-like object on the observation side
A method for manufacturing a rear projection screen, characterized in that the original transparent portion of the projection screen is removed. 3. When manufacturing the base material that will become the screen body by casting, a synthetic resin film containing a light absorbing agent is integrally laminated, and then a lenticular lens on the light source side is shaped by heat pressing. A method for manufacturing a rear projection screen, further comprising removing an original transparent portion of the film-like material on the observation side. 4. When manufacturing the base material that will become the screen body by extrusion molding, a lenticular lens is provided on the light source side at the same time as a synthetic resin film containing a light absorbing agent is supplied and integrated, or in a subsequent process. 1. A method for manufacturing a rear projection screen, which comprises shaping the film-like material on the observation side and removing a light-transmitting portion of the film-like material on the viewing side.