JPH1026802A - screen - Google Patents

Abstract

[PROBLEMS] To provide a light distribution characteristic control means having a high degree of freedom by obtaining a light distribution characteristic according to a place where the screen is installed with a screen used together with a projector. A screen (1) includes a microlens layer (2), a shielding layer (3), and a reflecting layer (4) in order from the audience side. After the installation, a black change image corresponding to each of the unnecessary light sources 6 is fixed on the shielding layer 3, and light shielding corresponding to each of the unnecessary light sources 6 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a screen.

[0002]

2. Description of the Related Art Screens used with projectors and projectors (hereinafter collectively referred to as projectors) include:
There is a demand for efficiently reflecting light rays projected from a projector to an audience. At the same time, it is desirable that unnecessary light entering the screen from other than the projector does not reach the eyes of the audience. This is because, when the unnecessary light is reflected by the screen and reaches the eyes of a spectator, the image on the screen becomes unclear.

[0003] In order to satisfy the above requirements, the light distribution characteristics of a screen have been conventionally controlled. The light distribution characteristic is a relationship between an angle-intensity distribution of a light ray incident on a screen and a light ray reflected from the screen.

The light distribution characteristics are often controlled in two directions, that is, a vertical angle and a horizontal angle of an incident light beam. In general, the angle of an incident light beam at which effective reflected light is obtained (referred to as an effective incident angle) is narrow in the vertical direction and wide in the horizontal direction. By narrowing the effective incident angle in the vertical direction, it is possible to prevent light such as a ceiling light from being reflected toward the audience. Further, unless the effective incident angle is widened in the horizontal direction, only a screen whose image is extremely dark when viewed from a position deviated left and right from the front of the screen can be obtained.

The degree of freedom in designing the light distribution characteristics is substantially determined by the type of the reflection surface of the screen, and the light distribution characteristics of the reflection surface using glass beads have the highest degree of freedom in design. The reflection surface using glass beads is formed by applying minute glass spheres (beads) to the screen surface, and controls the angle of the reflected light with respect to the incident light by selecting the refractive index of the glass to be used.

[0006]

In the above conventional example, the light distribution characteristics are determined on the assumption that there is a ceiling light above the screen and that the audience in front of the screen is spreading in the left-right direction. .

Here, considering the individual situation of the place where the screen is installed, for example, the ceiling light is not always located right above the screen. If the light distribution characteristics can be controlled according to such individual situations where the screen is installed, it is more effective for removing unnecessary light.

An object of the present invention is to provide a screen light distribution characteristic control means having a high degree of freedom, which can control the light distribution characteristic according to the individual situation of the installation place.

[0009]

The screen according to the present invention has a three-layer structure, and comprises a microlens layer, a shielding layer, and a reflective layer in order from the viewer side. The focus of the microlens layer is on the shielding layer. The shielding layer is made of a material that turns black in response to light. The reflecting layer reflects the light passing through the microlens layer and the shielding layer to the audience side to obtain a function as a screen.

[0010] The screen according to the present invention is of a fixed type,
It shall not be moved from the place where it is installed. The screen according to the present invention obtains a desired light distribution characteristic by performing two processes, that is, exposure of the shielding layer and fixing of the blackening of the shielding layer after installation at a target place.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a screen portion according to one embodiment of the present invention. The screen 1 of the present embodiment includes a microlens layer 2, a shielding layer 3, and a reflective layer 4 in order from the audience side, and a base 5 for supporting these layers and maintaining a predetermined shape as a screen.

The focus of the individual microlenses of the microlens layer 2 is focused on the shielding layer 3, and light entering the screen from the audience forms an image on the shielding layer 3. The shielding layer 3 is made of a substance that turns black in response to light, and in this embodiment, a material equivalent to a photographic film is used. The reflection layer 4 has a function of reflecting light passing through the microlens layer 2 and the shielding layer 3 to the audience side, and can be formed by, for example, aluminum vapor deposition on the base 5. The base 5 is made of a porous material having appropriate water permeability, and does not prevent the passage of moisture to the shielding layer 3 even when the reflective layer 4 is made of aluminum.

In the present embodiment, after the screen 1 is installed at the place of use, a desired light distribution characteristic is obtained through two processes of exposure of the shielding layer 3 and fixing of the shielding layer 3 to blackening.

Until the screen 1 is installed at the place of use,
The entire screen 1 is shielded from light. After the screen 1 is installed at the place of use, unnecessary light around the screen 1 is set to the same state as when the screen 1 is used. For example, if emergency lights or ceiling lights are on during use, turn on the emergency lights and ceiling lights. However, the projector that projects the image on the screen 1 is not turned on. Even better is to put black paper in front of the projector.

In this state, the light shielding of the entire screen 1 is removed for a predetermined time, and the shielding layer 3 is exposed.

Up to this point, the photosensitive processing of the shielding layer 3 has been described. FIG. 2 schematically shows the state of light passing on the screen at this time. In FIG. 2, reference numeral 6 denotes a light source for unnecessary light, and reference numeral 7 denotes an image of the light source 6 for unnecessary light formed on the shielding layer 3 by the microlens layer 3. As shown in the figure, a latent image corresponding to each of the unnecessary light sources is formed on the light shielding layer 3 by the photosensitive processing.

Next, a blackening / fixing process for developing and fixing the latent image is performed. This is performed by sequentially penetrating a chemical solution for development and fixing through the base 5 from the back surface of the screen. After this processing, a black image corresponding to each of the unnecessary light sources is formed on the light shielding layer 3.

The process up to this point is the black discoloration fixing process of the shielding layer 3. After that, an image can be projected on the screen and used like a normal screen. FIG. 3 schematically shows a light beam passing state in the normal use state. In FIG. 3, reference numeral 6 denotes a light source for unnecessary light, and reference numeral 7 denotes an image of the light source 6 for unnecessary light. Reference numeral 8 denotes a projector that projects an image on the screen 1.

The image 7 is blackened and fixed by the blackening fixing process, and unnecessary light from the light source 6 is blocked by the image 7.
It does not reach the next reflective layer 4. Since there is a black image on the shielding layer 3 corresponding to each of the unnecessary light sources, all unnecessary light is not reflected off the screen and does not reach the eyes of the audience.

After the black discoloration fixing process, no new black discolored portion is formed on the light shielding layer 3 by the light projected from the projector 8. The light projected from the projector 8 reaches the reflective layer 4 without being blocked by the light-shielding layer 3, and is reflected toward the audience, so that a clear image can be seen.

In this embodiment, the light-shielding portion of the light-shielding layer 3 is formed by blackening due to a chemical change. However, the light-shielding portion 3 may be formed by means such as machining or photolithography.

[0022]

According to the present invention, unnecessary light can be selectively blocked in accordance with the installation state of the screen, and a clearer image than before can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a first embodiment.

FIG. 2 is an explanatory diagram of a light beam passing state during photosensitive processing.

FIG. 3 is an explanatory diagram of a light beam passing state during normal use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Screen, 2 ... Micro lens layer, 3 ... Light shielding layer, 4 ... Reflection layer, 5 ... Base, 6 ... Light source of unnecessary light, 7 ... Image, 8 ... Projector.

Claims (2)

[Claims] 1. A screen on which an image is projected by a projector and a projector, comprising an array of microlenses, a shielding layer, and a reflecting layer in order from the observer side of the image, wherein the focal point of the microlens is A screen according to the shielding layer, wherein a pattern of a part capable of passing light rays and a part shielding the light rays is formed on the shielding layer. 2. The shielding layer is made of a photosensitive material, and unnecessary light around the screen is imaged on the shielding layer by the microlenses, and the imaged portion is turned black to be a shielding portion. Screen.