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    • 5. 发明授权
    • Rear-projection type image display apparatus and rear-projection type
screen
    • 背投型图像显示装置和背投型屏幕
    • US5485308A
    • 1996-01-16
    • US387354
    • 1995-02-13
    • Koji HirataTakahiko YoshidaHiroki YoshikawaMasayuki MuranakaAtsuo OsawaYutaka Matuda
    • Koji HirataTakahiko YoshidaHiroki YoshikawaMasayuki MuranakaAtsuo OsawaYutaka Matuda
    • G03B21/62H04N5/74G03B21/60
    • G03B21/625
    • 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.
    • 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。
    • 10. 发明授权
    • Rear-projection screen and a rear projection image display employing the
rear-projection screen
    • 后投影屏幕和采用后投影屏幕的背投影像显示器
    • US5513037A
    • 1996-04-30
    • US336528
    • 1994-11-09
    • Takahiko YoshidaKoji HirataHiroki YoshikawaMasayuki MuranakaIsao YoshizakiAtsuo Osawa
    • Takahiko YoshidaKoji HirataHiroki YoshikawaMasayuki MuranakaIsao YoshizakiAtsuo Osawa
    • G03B21/62G03B21/60
    • G03B21/625
    • A rear-projection screen for a rear-projection image display comprises a Fresnel lens sheet (2) and a lenticular lens sheet (3), or a Fresnel lens sheet (2), a lenticular lens sheet (3) and a light absorbing sheet (4). The entrance surface (21) of the Fresnel lens sheet (2) or the entrance surface (41) of the light absorbing sheet (4) is formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. The thickness of the Fresnel lens sheet (2) is approximately equal to that of the lenticular lens sheet (3). The entrance surface (31) and the exit surface (32) of the lenticular lens sheet (3) are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material, which is essential to the prior art rear-projection screen, are not necessarily dispersed in the base sheet (30) of the lenticular lens sheet (3). The rear-projection image display 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.
    • 背投影像显示器的背投屏幕包括菲涅尔透镜片(2)和双凸透镜片(3),或菲涅耳透镜片(2),双凸透镜片(3)和光吸收片 (4)。 菲涅耳透镜片(2)的入射表面(21)或光吸收片(4)的入射表面(41)通过连续且垂直地布置多个水平细长的双凸透镜而形成。 菲涅尔透镜片(2)的厚度大致等于双凸透镜片(3)的厚度。 双凸透镜片(3)的入射表面(31)和出射表面(32)通过连续且水平地布置多个垂直细长的双凸透镜而形成。 对于现有技术的背投屏幕来说,光漫射材料的颗粒不一定分散在双凸透镜片(3)的基片(30)中。 设置有该背投屏幕的背投影像显示器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。