JPH0723788Y2 - Projection screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a transmission type projection screen used in a video projection television, etc., and is suitable for a large projection screen, especially when the screens are connected to increase the size. It relates to a projection screen.

(Prior Art) When a large number of spectators such as a large conference room, an auditorium, a classroom, or a theater simultaneously observe, it is desirable that the screen be as large as possible. In the past, it was common to install a large projection film and project an image onto it, as represented by a movie theater. However, such a projection method is called a reflection method, but there is an inconvenience that the surroundings must be darkened. For this reason, a transmissive screen that can be used even in a dark room has recently been developed and popularized. As this type of transmissive screen, it is common to mix a diffusing agent in the substrate, or to form a diffusing agent-containing coating layer, although such a screen is also available in a considerably large size, There were some regrets that the diffusivity of light rays could not be given directivity. Therefore, recently, for rear projection screens used in video projection televisions, etc., synthetic resin materials such as methacrylic resin and vinyl chloride resin are generally used, and lenticular lenses are formed to expand the viewing angle. Are manufactured by extrusion molding, casting molding, injection molding or hot press molding.

(Problems to be solved by the invention) By the way, such a screen is made finer in order to increase the resolution, and accordingly, the thickness of the screen base material becomes thinner, so that the rigidity of the screen tends to be lacking.

Further, when the screen is manufactured by the above-described molding method, it is impossible to mass-produce a large screen having a length and width of more than 1.5 m, for example, because of limitations on molds and manufacturing equipment. However, the demand for such large screens tends to increase due to the development of video projection televisions and other projection devices.

Therefore, the applicant of the present invention relates to a large screen in which screens having lenticular lenses are joined together,
We have already proposed Japanese Patent Applications No. 57-50684, No. 57-40574, and No. 57-41433, but to increase the rigidity of the screen and maintain the flatness of the screen for stable mounting. It was necessary to examine.

In view of such a situation, the present invention aims to provide a projection screen which can maintain the flatness of the screen and can be stably mounted even with a large screen.

(Means for Solving the Problems) That is, the present invention has been made to achieve the above-mentioned problems, and the gist thereof is to provide a lens sheet having a rod-shaped rib fixed to the upper side of the back surface and the rod-shaped rib. It comprises a support sheet having a space to accommodate it and mounting ribs fixed to the back four sides, and a frame member surrounding the four sides. The rod-shaped rib is housed in the cavity of the support sheet, and the frame member is fitted to support the sheet. It is a projection screen characterized by being screwed to the mounting rib of.

(Example) Hereinafter, the present invention will be described with reference to the drawings of an example.

1 to 3 show an example of the present invention, in which (1) is a lens sheet, (2) is a rod-shaped rib fixed to the upper back side of the lens sheet (1), and (3) is a support. Sheet,
Reference numeral (4) is a mounting rib fixed to the back four sides of the support sheet (3).

Of these, the lens sheet (1) and the support sheet (3)
Is made of translucent synthetic resin such as acrylic resin, vinyl chloride resin or polycarbonate resin, and the former lens sheet (1) has lenticular lenses formed on both sides or one side as shown in FIG. The lens sheet (1) may be formed with a fly-eye lens or a Fresnel lens. In FIG. 4, (1A) is an external light absorption layer.

Further, the latter supporting sheet (3) plays a role of supporting the lens sheet (1), but this sheet may be a sheet having a circular or linear Fresnel lens or a lenticular lens as shown in FIG. Good. The rod-shaped ribs (2) and the mounting ribs (4) may be made of the same synthetic resin, and may be adhered to the lens sheet (1) and the support sheet (3) with an adhesive.

The present invention is a projection screen comprising a combination of the lens sheet (1) and the support sheet (3) as described above, and the rod-shaped rib (2) is housed in the space (5) of the support sheet (3). A frame member (6) made of metal or the like which surrounds the four sides is fitted to this, and is screwed (7) to the mounting rib (4) of the support sheet (3). In the figure, (8) is a packing and (9) is a lens sheet (1).
If such voids (9) are provided on the left and right sides and the lower side of the lens sheet (1), the lens sheet (1) is hung on the upper side of the support sheet (3), and It is convenient because it can absorb expansion and contraction.

Since the present invention is configured as described above, it becomes possible to reliably and stably fix the lens sheet (1) while maintaining the flatness in a state where the lens sheet (1) is joined to the support sheet (3).

Although the embodiment of the present invention has been described above, the present invention is not limited to such an example. In particular, the present invention is effective when the lens sheet (1) and the support sheet (3) can be reliably joined together, so that it is effective when the screen is large and tends to lack rigidity.
This is effective when the lens sheet (1) and the support sheet (3) are formed by joining a plurality of sheets in a butt shape.

(Effect of the Invention) Since the present invention has the configuration as described in detail above, the lens sheet is maintained flat with respect to the support sheet,
There is an advantage in that the projection screen can be stably and reliably joined, and thus can provide a high-performance projection screen that is not deformed over a long period of time.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG.
Fig. II-II line enlarged cross-section, Fig. 3 is Fig. 1 III-III line enlarged cross-section, and Fig. 4 is a partial perspective view showing an example of a lens sheet,
FIG. 5 is a partial perspective view showing an example of a support sheet. (1) …… Lens sheet, (2) …… Rod rib (3) …… Support sheet, (4) …… Mounting rib (5) …… Vacancy, (6) …… Frame material (7) …… Screw

Claims (3)

[Scope of utility model registration request] 1. A lens sheet having rod-shaped ribs fixed to the upper side of the back surface, a support sheet having cavities for accommodating the rod-shaped ribs and mounting ribs fixed to the four sides of the back surface, and a frame member surrounding the four sides. A projection screen, characterized in that a rod-shaped rib is housed in a space of the support sheet, and a frame member is fitted and screwed to a mounting rib of the support sheet. 2. The projection screen according to claim 1, wherein the lens sheet is a lenticular lens sheet adhered in a butt shape. 3. The projection screen according to claim 1, wherein the support sheet is a Fresnel lens sheet.