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1. 发明授权

US5485308A Rear-projection type image display apparatus and rear-projection type screen 失效
标题翻译：背投型图像显示装置和背投型屏幕
公开(公告)号：US5485308A
公开(公告)日：1996-01-16
申请号：US387354
申请日：1995-02-13
申请人： Koji Hirata , Takahiko Yoshida , Hiroki Yoshikawa , Masayuki Muranaka , Atsuo Osawa , Yutaka Matuda
发明人： Koji Hirata , Takahiko Yoshida , Hiroki Yoshikawa , Masayuki Muranaka , Atsuo Osawa , Yutaka Matuda
IPC分类号： G03B21/62 , H04N5/74 , G03B21/60
CPC分类号： G03B21/625
摘要： A rear-projection screen for a rear-projection image display apparatus comprises a Fresnel lens sheet, a first lenticular lens sheet, and a second lenticular lens sheet or a Fresnel lens sheet, first and second lenticular lens sheets and a light absorbing sheet. A light entrance surface of the first lenticular lens sheet or a light exit surface thereof, or both of these surfaces are formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. A thickness of the first lenticular lens sheet is selected to be the thinner than thicknesses of the Fresnel lens sheet, the second lenticular lens sheet, and the light absorbing sheet. The entrance surface and the exit surface of the second lenticular lens sheet are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material are not necessarily dispersed in the base sheet of the second lenticular lens sheet. The rear-projection image display apparatus provided with this rear-projection screen has satisfactory focusing characteristics and enhanced vertical directional characteristics and is capable of displaying an image in high brightness and high contrast.
摘要翻译：背投影像显示装置的背投屏幕包括菲涅尔透镜片，第一双凸透镜片，第二双凸透镜片或菲涅耳透镜片，第一和第二柱状透镜片和光吸收片。第一双凸透镜片的光入射表面或其光出射表面或这两个表面的两个形状通过连续且垂直地布置多个水平细长的双凸透镜而形成。第一双凸透镜片的厚度被选择为比菲涅尔透镜片，第二双凸透镜片和光吸收片的厚度薄。第二双凸透镜片的入射面和出射面通过连续且水平地布置多个垂直细长的双凸透镜形成。光漫射材料的颗粒不一定分散在第二双凸透镜片的基片中。设置有该背投屏幕的背投影像显示装置具有令人满意的聚焦特性和增强的垂直方向特性，并且能够以高亮度和高对比度显示图像。

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