| 发明名称 |
Condenser lens, polarizing element, light source apparatus, and projection display apparatus |
| 摘要 |
Disclosed is a condenser lens with large aperture, having a numerical aperture of 0.9 or larger, which consists of a bi-aspherical single lens having a first surface of convex form facing the larger conjugate side and a second surface facing the smaller conjugate side and whose outermost circular zone is formed concave, the condenser lens satisfying the following conditions (1) or (2). Also disclosed are a light source apparatus using such a condenser lens and a projection display apparatus using such a light source apparatus. (1) 0.42<r1/nf<0.45 18<|r2/nf|-0.39<K1<-0.25 0.11< DELTA 2/f<0.14 (2) 0.4<r1/nf<0.6 -0.5<r2/nf<-0.3 -0.6<K1<-0.2 -0.1<SG2/f<0.1 where f: focal length of the whole lens system n: refractive index of the lens r1: radius of center curvature of the first surface r2: radius of center curvature of the second surface K1: conic constant of the first surface DELTA 2: axial difference between the aspherical face of the outermost circular zone within the effective diameter of the second surface and a reference spherical face having the radius of center curvature of r2 SG2: axial difference of the aspherical face of the outermost circular zone within the effective diameter of the second surface with respect to the center of the second surface.
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| 申请公布号 |
US5384659(A) |
申请公布日期 |
1995.01.24 |
| 申请号 |
US19930047504 |
申请日期 |
1993.04.16 |
| 申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
SHIKAMA, SHINSUKE;KIDA, HIROSHI;DAIJOGO, AKIRA |
| 分类号 |
G02B3/04;G02B5/30;G02B13/18;G02B19/00;H04N9/31;(IPC1-7):G02B13/18 |
主分类号 |
G02B3/04 |
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