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    • 2. 发明授权
    • Polarized light illumination device and projector
    • 偏光照明装置和投影机
    • US6132047A
    • 2000-10-17
    • US373206
    • 1999-08-12
    • Yoshitaka Itoh
    • Yoshitaka Itoh
    • G02B27/14G02B27/28H04N9/31G03B21/14G02F1/1335G03D21/00
    • G02B27/283G02B27/145G02B27/149H04N9/3105H04N9/3164H04N9/3167
    • In a polarized light illumination apparatus, randomly polarized lights emitted from first and second light sources are respectively separated by a polarized light separating optical element into two different types of polarized light thereby producing three types of polarized light which are polarized in directions perpendicular to one another. The polarized lights are partially returned to the light sources and their polarization directions are rotated. Secondary light source images are formed at locations shifted in an x direction whereby polarization is aligned in the same single direction. Thus, even though a plurality of light sources are used, the polarized light illumination apparatus can emit illumination light using both polarized components without causing an increase in the illumination angle. Furthermore, a projector capable of projecting an image with a very high brightness can be realized.
    • 在偏振光照明装置中,从第一和第二光源发射的随机偏振光分别由偏振光分离光学元件分离成两种不同类型的偏振光,从而产生在垂直于彼此垂直的方向上极化的三种类型的偏振光 。 偏振光部分地返回到光源并且它们的偏振方向旋转。 二次光源图像形成在沿x方向偏移的位置,从而偏振在相同的单一方向上对准。 因此,即使使用多个光源,偏振光照明装置也可以使用两个偏振分量发出照明光,而不会增加照明角度。 此外,可以实现能够以非常高的亮度投影图像的投影仪。