TRANSMISSION TYPE SCREEN
PURPOSE:To improve the brightness of pictures markely and to prevent the reflection of unnecessary light from a front surface in a rear projection type image receiver by forming Fresnel lenses on the rear side of a screen body and forming many conical bodies on the front side. CONSTITUTION:Projectin...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | PURPOSE:To improve the brightness of pictures markely and to prevent the reflection of unnecessary light from a front surface in a rear projection type image receiver by forming Fresnel lenses on the rear side of a screen body and forming many conical bodies on the front side. CONSTITUTION:Projecting lighg 7 for projection of pictures irradiated from the rear of a screen body 8 is bent in the direction parallel with the axis of the screen by Fresnel lenses 9, and is emitted to the front side by having directivity around the axial direction of the screen by conical bodies 10. Therefore the emission of the projecting light toward the directions of large angles from the axis on the front side of the body 8 is decreased and the brightness of the picture is increased markedly. If the conical bodies 10 having semispherical tips and light absorptive materials 11 among the clearances between the bodies 10 are provided, the reflection of the unncessary incident light from the front side is prevented and the easy-to-see pictures are projected. |
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