JPH0354544A - screen - Google Patents

Abstract

PURPOSE:To eliminate the influence of diffused external light by arranging light shield plates and a lenses on the surface of a reflection screen. CONSTITUTION:The reflection screen surface 1 is partitioned with many shield plates 2, a lens 3 is charged in each small partitioned section, and emissive light which is projected on the surface 1 almost vertically from a projection 6 is converged by the lenses 3, reflected by the surface 1, and passes through the lenses 3 again to form a projection light image with high directivity. At this time, the slanting diffused external light 4 is absorbed by the shield plates 2 to obtain the reflection screen which has good balance between the screen gain and diffusivity without being affected y the diffused external light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a reflective screen for image projection.

[Prior art] The structure of conventional reflective screens has ranged from simple white scattering plates to screens with beads mixed in, screens with uneven high reflectance film surfaces, etc. [Problems to be solved by the invention] However, with the above-mentioned conventional technology, it is easily affected by ambient light, and in a bright room with lighting, the contrast decreases significantly, and the black level cannot be expressed, making it impossible to appreciate the image unless the room is darkened. There is a problem.

Therefore, the present invention aims to solve these problems.
The purpose is to provide a bright screen that is less susceptible to disturbance light and provides a projected image with high contrast even in a bright room.

[Means for Solving the Problems] The screen of the present invention is provided with a shielding plate that divides the screen surface into small sections approximately perpendicularly to the reflective screen surface, and for each small section. It is characterized by having a filled lens.

[Embodiment] Figure 1 is a main sectional view of an embodiment of the present invention, in which a shielding plate 2 is provided on the screen reflective surface 1 side of the screen to partition the reflective screen surface into a large number of small sections. . A filled rerezu group is formed for each partitioned small section. The light emitted from the projection device 6 substantially perpendicularly to the screen surface passes through the lens, is reflected by the screen reflection surface, passes through the lens again, enters the viewer's eyes, and is perceived. At this time, the light emitted from the projection device is projected radially, so if the light from the shielding plate is not used effectively, it will be lost, but with the lens, the light flux will be narrowed down and the light that reaches the screen will be lost. can be reflected effectively.

When the reflected light passes through the lens again after reflection, it is bent, so by giving the lens an appropriate curvature, you can create a screen with strong directivity, that is, high screen gain, or by changing the curvature of the lens, it can be diffused to some extent. By adding gender, it is possible to reduce the angle dependence depending on the viewer's position. In either case, reflected light can be used effectively. On the other hand, when external light from an angle hits the light shielding plate, it is absorbed and not reflected, so that it is not affected.

[Effects of the Invention] As described above, according to the present invention, by arranging a shielding plate and a lens on the reflective screen surface, it is prevented from being affected by ambient light, and therefore even in a relatively bright room. Since the black level of the screen is maintained, you can get clear images with high contrast. Moreover, it has the effect of providing a bright screen with a good balance between screen gain and diffusivity.

[Brief explanation of drawings]

FIG. 1 is a main sectional view showing an embodiment of the screen of the present invention. 1...Reflective screen surface 2...
・・Shielding plate・・・・・・・・・・・・・・・Disturbance light・・・・Emission light・・・・・Projection device・・・・······eye

Claims (1)

[Claims] In a screen that reflects and projects the light emitted from the projection device, a shielding plate that divides the screen surface into small sections is placed on the reflecting screen surface approximately perpendicular to the screen reflecting surface, and each small section is filled with A screen characterized by having a lens.