JPH0684454U - Reflective screen - Google Patents

Abstract

(57) [Abstract] [Purpose] Along with being able to be thin, it is possible to satisfactorily block ambient light from an oblique direction and enable use in a relatively bright environment. [Structure] A grid-shaped light-shielding portion 10 is provided on the entire front surface of the reflective screen 1, and is divided into a large number of small projection areas 1a. The pitches P1 and P2 of the light shielding portion 10 are each about 5 mm, and the depth w is about 5 mm.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reflective screen used in various projectors such as liquid crystal projection devices.

[0002]

[Prior art]

 There are two types of screens of this type in which image light from various projectors such as a liquid crystal projection device is enlarged and projected, that is, a transmissive screen and a reflective screen. Since the transmissive screen transmits ambient light to the back surface and therefore reflects little ambient light to the front surface, the projection light from the back surface is less likely to reduce the contrast due to the ambient light even in a relatively bright environment. It has the advantage that it can be used in a relatively bright environment. On the other hand, the reflection type screen also reflects ambient light toward the surface in the same way as projected light, so the contrast is significantly reduced by the ambient light in a bright environment, so there is a major limitation in using it in a bright environment. Have. In the case of reducing the influence of ambient light on a reflective screen, conventionally, as shown in FIG. 3, light shielding plates 2 are provided on the three sides of the reflective screen 1, that is, the upper side and the left and right sides, and the ambient light from above and from the left and right directions is provided. By cutting off No. 3, the decrease in contrast is prevented. Reference numeral 4 is a projector, and 5 is a lighting device installed on the ceiling, wall surface, or the like.

[0003]

[Problems to be solved by the device]

 As described above, in the conventional reflective screen 1, the light shielding plate 2 is provided to block the ambient light 3, but in that case, the depth dimension W of the light shielding plate 2 becomes a problem. That is, when the depth dimension W is short, the ambient light 3 from an oblique direction illuminates the central portion of the screen, which causes a reduction in contrast. When the depth dimension W is increased to prevent the ambient light 3, the thickness of the entire screen is reduced. There was the inconvenience of increasing and taking up space.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to enable thinning and to appropriately block ambient light from an oblique direction. And to provide a reflective screen that can be used in a relatively bright environment.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a reflection type screen with a light-shielding portion having a grid pattern or a honeycomb pattern having a predetermined pitch and a predetermined depth dimension, or a pattern similar thereto. Is.

[0006]

[Action]

 In the present invention, the light shielding unit protects each projection area from ambient light by partitioning the entire front surface of the screen into a large number of small projection areas and blocking ambient light from an oblique direction.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is an external perspective view showing an embodiment of a reflection type screen according to the present invention, and FIG. 2 is an enlarged sectional view of a main part of the screen. In these figures, in the present embodiment, a grid-shaped light-shielding portion 10 having a predetermined pitch P1, P2 and a predetermined depth dimension w is provided on the entire front surface of the reflective screen 1, and the front surface of the screen 1 is provided with a large number of projection areas. It is divided into 1a. The reflective screen 1 is made of opaque white resin or the like, and has a width of 1219 mm and a height of 914 mm when the projection size L is 60 inches. In the present embodiment, the light-shielding portion 10 is shown as being integrally formed with the reflection type screen 1, but the light-shielding portion 10 is not limited to this, and is separately produced and integrally joined by an adhesive or welding. May be In addition, it is desirable that the color of the light-shielding portion is black because of its function. The pitches P1 and P2 of the light-shielding portions 10 are each about 5 mm, the depth dimension w is about 5 mm, and the number of projection areas 1a is 183 in the vertical direction and 243 in the horizontal direction when L = 60 inches. The pitches P1 and P2 do not necessarily have to be equal. The plate thickness t of the light shielding portion 10 is preferably a thickness that is inconspicuous from the front, and is set to about 0.5 mm.

Thus, in the reflection-type screen 1 having such a configuration, the front surface of the screen is divided into a large number of small projection areas 1a by the light-shielding portion 10, so that the angle from the direction of 45 ° with respect to the optical axis 11 is increased. The ambient light 3 can be completely blocked, and the part within 45 ° can be partly blocked. Therefore, even in a bright room, it is possible to obtain an image with higher contrast than the conventional reflective screen. Further, when the pitches P1 and P2 of the light shielding part 10 were not changed at 5 mm and the depth dimension w was changed from 5 mm to 7 mm, the effect of shielding the ambient light 3 was further increased and a clearer image could be obtained. In this case, the viewing range is narrowed against the increase of the light-shielding effect, but when viewing with a very small number of people, for example, 1 to 3 people, the front with a very high contrast is seen from the front and near the screen. Projection is possible.

Although the above-described embodiment is provided with the lattice-shaped light-shielding portion 10, the present invention is not limited to this, and a light-shielding portion having a honeycomb shape or a pattern similar thereto may be used. Good. Further, both the pitch and the thickness of the light-shielding portion are not limited to the dimensions shown here, and a finer pitch and thickness may be considered.

[0010]

[Effect of device]

 As described above, according to the reflection type screen of the present invention, since the light shielding portion having a lattice shape, a honeycomb shape, or a pattern similar to these is provided on the entire front surface of the screen and divided into a large number of small projection regions, It is possible to reliably block the ambient light from the direction, make it possible to reduce the thickness, and provide an image that is highly visible and easy to see even in a relatively bright environment.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a reflection type screen according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the screen.

FIG. 3 is a perspective view showing a conventional example of a reflective screen.

[Explanation of symbols]

 1 Reflective screen 2 Light-shielding plate 3 Ambient light 4 Projector 5 Lighting device 10 Light-shielding part

Claims (1)

[Scope of utility model registration request] 1. A reflection-type screen comprising a light-shielding portion having a lattice-like or honeycomb-like pattern having a predetermined pitch and a predetermined depth, or a pattern similar to the above, provided on the entire front surface of the reflection-type screen.