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    • 4. 发明申请
    • REAR PROJECTION SCREEN AND METHOD FOR THE PRODUCTION THEREOF
    • 背投影屏幕及其制造方法
    • WO2004042471A8
    • 2004-11-11
    • PCT/EP0310762
    • 2003-09-27
    • ROEHM GMBHSCHMIDT JANNGROOTHUES HERBERTSCHARNKE WOLFGANGLORENZ HANSHAERING HELMUTDICKHAUT-BAYER GUENTHER
    • PARUSEL MARKUSSCHMIDT JANNGROOTHUES HERBERTSCHARNKE WOLFGANGLORENZ HANSHAERING HELMUTDICKHAUT-BAYER GUENTHER
    • G03B1/00G03B21/62B32B27/20
    • G03B21/62
    • The invention relates to rear projection screens comprising at least one light-diffusing polymethylmethacrylate layer which has a thickness ranging between 0.05 and 4 mm and contains spherical plastic particles having a size ranging between 5 and 35 ñm at a concentration ranging from 2 to 60 percent by weight relative to the total weight of the light-diffusing polymethylmethacrylate layer, said spherical plastic particles having a refractive index that differs by 0.02 to 0.2 from that of the polymethylmethacrylate matrix. The concentration of the spherical plastic particles cP, the thickness of the light-diffusing polymethylmethacrylate layer ds, and the size of the spherical plastic particles Dp are selected such that the ratio cP*ds/Dp ranges between 0.0015 and 0.015 percent by weight *mm/ñm while the ratio between the mean surface roughness of the polymethylmethacrylate layer Ra and the size of the spherical plastic particles DP ranges between 0.05 and 0.4. The inventive rear projection screens are characterized by a particularly high quality of the illustrations which are projected thereupon.
    • 本发明涉及包含在0.05至4mm,其包含具有的浓度范围为2〜60重量%为5〜35微米范围内的颗粒尺寸的球形塑料颗粒的厚度范围中的至少一个光散射聚甲基丙烯酸甲酯层背投屏幕, 基于光散射聚甲基丙烯酸甲酯层的总重量,球形塑料粒子在聚甲基丙烯酸甲酯基体的折射率的差在0.02〜0.2的范围内,其中所述球状塑料颗粒厘泊的浓度,光散射聚甲基丙烯酸甲酯层DS的厚度,并且 的球形塑料颗粒尺寸的颗粒DP是选择为使得比率厘泊* DS / DP <3>在从0.0015至0.015重量%的范围内*毫米/微米<3>和聚甲基丙烯酸甲酯层Ra为平均表面粗糙度的比 到球形塑料颗粒DP的粒度在该范围内 从0.05到0.4。 背投屏幕的特征在于投射在其上的图像的质量特别高。