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    • 10. 发明授权
    • Illumination unit and projection type image display apparatus employing the same
    • 照明单元和投影型图像显示装置
    • US07331680B2
    • 2008-02-19
    • US11234090
    • 2005-09-26
    • Kye-hoon LeeYoung-chol LeeWon-yong Lee
    • Kye-hoon LeeYoung-chol LeeWon-yong Lee
    • G06B21/28G02F1/13357
    • G03B21/2013G03B21/208G03B33/06
    • An illumination unit with an improved color synthesis prism, which can synthesize light beams emitted from compact light sources, and a projection type image display apparatus employing the illumination unit. The illumination unit includes first, second, and third light source units to emit first, second, and third light beams of different wavelength bands, a first triangular prism including a first entrance surface through which the first beam emitted from the first light source unit is incident, a first exit/reflection surface inclined with respect to the first entrance surface, and a second entrance surface on which the first light beam reflected by the first exit/reflection surface and the second light beam emitted from the second light source unit are incident, a second triangular prism including a third entrance surface through which the third light beam emitted from the third light source unit is incident, a second exit/reflection surface inclined with respect to the third entrance surface, and a fourth entrance surface facing the first exit/reflection surface and spaced a predetermined distance from the first exit/reflection surface, a first color filter formed on the second entrance surface to reflect the first light beam incident from the first exit/reflection surface and to transmit the second light beam such that the first and second light beams are directed toward the first exit/reflection surface, and a second color filter formed on the fourth entrance surface to reflect the third light beam incident from the second exit/reflection surface and to transmit the first and second light beams transmitted from the first exit/reflection surface such that the first, second, and third light beams are directed toward the second exit/reflection surface.
    • 具有改进的颜色合成棱镜的照明单元,其可以合成从小型光源发射的光束,以及采用该照明单元的投射型图像显示装置。 照明单元包括发射不同波长带的第一,第二和第三光束的第一,第二和第三光源单元,包括第一入射面的第一三角棱镜,第一光源单元发射的第一光束通过第一入射面 相对于第一入射面倾斜的第一出射/反射面和由第一出射/反射面反射的第一光束和从第二光源单元发射的第二光束入射的第二入射面 第二三角棱镜,包括从第三光源单元发射的第三光束入射的第三入射面,相对于第三入射面倾斜的第二出射/反射面,以及面向第一出射口的第四入射面 /反射面,与第一出射/反射面隔开预定的距离,形成在第二入口处的第一滤色器 e反射从第一出射/反射表面入射的第一光束并透射第二光束,使得第一和第二光束指向第一出射/反射表面,以及形成在第四出射/反射表面上的第二滤光器 入射面以反射从第二出射/反射表面入射的第三光束,并透射从第一出射/反射表面透射的第一和第二光束,使得第一,第二和第三光束指向第二出射口 /反射面。