JP4741830B2 - Rear projection type projector - Google Patents

Description

  The present invention relates to a rear projection projector, and more particularly to a multivision rear projection projector in which a plurality of rear projection screens for projecting projected images are arranged vertically and horizontally.

  As a conventional multivision rear projection projector, for example, as shown in FIG. 6, in order to maintain a sense of unity of video and achieve good image quality, as shown in FIG. Back surface provided with adhesive tape 44 and the like that are attached to the respective side surfaces of a plurality of screen members 42 constituting the screen and connect lenticular sheet 45, Fresnel lens 46, and reinforcing plate 47 constituting the same screen member 42. A projection projector 41 is disclosed.

JP 2000-162709 A

  However, in the conventional rear projection projector 41, since the adhesive tape 44 is present at the edge of the screen member 42, an image projected between the screens when a plurality of screen assemblies are arranged vertically and horizontally. There was a problem that a gap was formed in.

  Therefore, the present invention has been made in view of the problems in the above-described conventional rear projection type projectors, etc., and the back surface that enables the joint-like gap generated between the screens to approach zero as much as possible. An object is to provide a projection type projector.

In order to achieve the above object, the present invention provides a rear projection type screen assembly, wherein a diffusion layer that has been subjected to an antireflection treatment, and is formed to be smaller than the diffusion layer and superimposed on the diffusion layer. a transparent layer a step at the edge of the diffusion layer is formed, said transparent layer and the diffusion layer a plurality of arranged adjacent transparent layers and the diffusion layer and the transparent adhesive means for bonding through the step portion And a Fresnel lens formed substantially in the same shape as the transparent layer and superimposed on the transparent layer, and a second transparent bonding means for bonding the transparent layer and the Fresnel lens through the side surfaces of each other, A light-shielding plate that supports the bonded diffusion layer, the transparent layer, and the Fresnel lens via the transparent layer and a side surface of the Fresnel lens; and a housing that is coupled to the light-shielding plate. To do.

  According to the present invention, the transparent layer and the diffusion layer are bonded by the transparent bonding means via the stepped portion, and the side surfaces of the transparent layer and the Fresnel lens are bonded by the second transparent bonding means. The image light projected from the light source is refracted by the Fresnel lens and converted to light that is nearly perpendicular to the screen consisting of a transparent layer and a diffusion layer. When the image is formed on the diffusion layer, the image light reaches the edge of the diffusion layer, so that the image can be projected on the entire surface of the diffusion layer.

  Further, the present invention is a rear projection type screen, wherein a plurality of the rear projection type screen assemblies are arranged vertically, horizontally, vertically and horizontally. According to this rear projection screen, the image light projected from the light source is refracted by the Fresnel lens, changed to light that is nearly perpendicular to the screen composed of the transparent layer and the diffusion layer, and imaged on the diffusion layer. The Therefore, the image light reaches the edge of the diffusion layer of each screen, and the width of the joint generated between the screens can be made as close to zero as possible.

  Furthermore, the present invention is a rear projection type projector, wherein a light source is provided in each of the casings of the rear projection type screen. Thus, as described above, a rear projection projector that can minimize the joint width between the screens can be provided.

  As described above, according to the present invention, it is possible to provide a rear projection projector or the like that can make the joint-like gap generated between the screens as close to zero as possible.

  FIG. 1 shows a screen used in a rear projection type projector according to the present invention. This screen 1 is composed of a diffusion layer 2 and a transparent layer 3.

  The diffusion layer 2 is formed in a rectangular plate shape and disposed on the image plane. The diffusion layer 2 is subjected to antireflection processing to reduce reflection of external light and an image on the screen.

  The transparent layer 3 is formed in a rectangular plate shape like the diffusion layer 2, but is formed slightly smaller than the diffusion layer 2, and is superimposed on the diffusion layer 2 as clearly shown in FIG. At this time, the dimension is such that a step of about several mm is formed at the edge of the diffusion layer 2.

  When joining the plurality of diffusion layers 2 and the transparent layer 3, as shown in FIG. 3, a transparent adhesive tape (transparent adhesive means) 4 is attached to the step portion, and both are integrated.

  Next, the structure and assembly method of the rear projection type screen assembly according to the present invention will be described with reference to FIG.

  As shown in FIGS. 1 and 2, a step processed portion is provided at the edge of the transparent layer 3 of the screen 1, and as shown in FIG. 4, the Fresnel lens 5 having the same size as the transparent layer 3 is formed on the transparent layer 3. Arrange on the light source side. The Fresnel lens 5 functions to refract obliquely incident light and change it into straight light.

  Next, a transparent adhesive tape (second transparent adhesive means) 6 is attached to the step processed portion of the transparent layer 3 and the edge of the Fresnel lens 5, and further a light shielding plate 7 made of metal or the like bent into a Z shape. Paste. A rear projection type screen assembly (hereinafter referred to as “screen assembly”) is formed by attaching the diffusion layer 2, the transparent layer 3, the Fresnel lens 5, the transparent adhesive tape 6, and the light shielding plate 7 to the screen frame 8. ) 9 is completed.

  Then, the light source 11 is arranged inside the cube frame 10, and the screen assembly 9 and the cube frame 10 are coupled with the bolts 12 to form a housing, thereby completing the single-plane projector cube 14.

  According to this single-sided projector cube 14, the image light L projected from the light source 11 is refracted by the Fresnel lens 5 and converted into light that is nearly perpendicular to the screen 1, and forms an image on the diffusion layer 2. At this time, as clearly shown in FIG. 4B, since the image light L reaches the edge of the diffusion layer 2 of the screen 1, the image is displayed on the entire screen.

  FIG. 5 shows a case where the rear projection projector 21 is configured by combining three rear projection screen assemblies shown in FIG.

  In this rear projection type projector 21, three diffusion layers 2 and transparent layers 3 are integrated by attaching a transparent adhesive tape 4 to a step portion as shown in FIG. The lens 5 is bonded to each other by the transparent adhesive tape 6 through the side surfaces, and the diffusion layer 2 to the transparent adhesive tape 6 are supported by the light shielding plate 7. Then, similarly to the single-sided projector cube 14 shown in FIG. 4, the light source 11 is arranged inside each cube frame 10, and the screen assembly 9 and the cube frame 10 are coupled with bolts 12 to form a housing shape. Thus, the rear projection type projector 21 is completed.

  According to the rear projection projector 21, the image light L projected from the light source 22 is refracted by the Fresnel lens 5 and is nearly perpendicular to the screen 1, as in the case shown in FIG. And is imaged in the diffusion layer 2. Therefore, as clearly shown in FIG. 5B, the image light L reaches the edge of the diffusion layer 2 of the screen 1, and the width of the joint 23 generated between the screens 1 is reduced to zero. You can get closer.

It is a figure which shows the screen of the rear projection type projector concerning this invention, Comprising: (a) is a top view (figure which shows a video surface), (b) is a front view, (c) is a side view, (d) is a bottom view. It is a figure (the figure which shows the light source side). It is a figure which shows the screen of FIG. 1, Comprising: (a) is a front view, (b) is the edge part enlarged view of (a). It is a figure which shows the connection part of the adjacent screen at the time of arranging the screen of FIG. 2 in multiple numbers. It is a figure which shows the single-plane projector cube concerning this invention, Comprising: (a) is whole sectional drawing, (b) is the partially expanded view of (a). It is a figure which shows the state which arranged the multiple single-surface projector cube concerning this invention, and comprised the rear projection type | mold projector, Comprising: (a) is whole sectional drawing, (b) is the partially expanded view of (a). . It is a whole sectional view showing an example of the conventional rear projection type projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen 2 Diffusion layer 3 Transparent layer 4 Transparent adhesive tape 5 Fresnel lens 6 Transparent adhesive tape 7 Light shielding plate 8 Screen frame 9 Screen assembly 10 Cube frame 11 Light source 12 Bolt 14 Single-sided projector cube 21 Rear projection type projector 23 Joint

Claims (3)

A diffusion layer that has undergone antireflection treatment;
A transparent layer that is formed smaller than the diffusion layer and has a step formed at the edge of the diffusion layer when superimposed on the diffusion layer;
And said diffusion layer and the transparent layer plurality placed a transparent adhesive means for adhering the adjacent transparent layers of the diffusion layer through the step portion,
A Fresnel lens formed in substantially the same shape as the transparent layer and superimposed on the transparent layer;
A second transparent adhesion means for adhering the transparent layer and the Fresnel lens through the side surfaces;
A light-shielding plate that supports the bonded diffusion layer, the transparent layer, and the Fresnel lens via side surfaces of the transparent layer and the Fresnel lens;
A rear projection type screen assembly comprising: a housing coupled to the light shielding plate.   A rear projection screen comprising a plurality of rear projection screen assemblies according to claim 1 arranged vertically, horizontally, vertically and horizontally.   A rear projection projector comprising a light source inside each of the casings of the rear projection screen according to claim 2.

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