Condenser lens, polarizing element, light source apparatus, and

Details Condenser lens, polarizing element, light source apparatus, and Condenser lens, polarizing element, light source apparatus, and

1993-04-16

1995-01-24

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359718, G02B 1318

Patent

active

053846591

ABSTRACT:
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
f<0.45 18<.vertline.r2
f.vertline.-0.39<K1<-0.25 0.11<.DELTA.2/f<0.14
(2) 0.4<r1
f<0.6 -0.5<r2
f<-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.

REFERENCES:
patent: 4571034 (1986-02-01), Nakamura
patent: 4641929 (1987-02-01), Braat
patent: 4671623 (1987-06-01), Chikuma
patent: 4729645 (1988-03-01), Suda
patent: 4743093 (1988-05-01), Oinen
patent: 4842388 (1989-06-01), Tanaka et al.
patent: 5087115 (1992-02-01), Ishibai et al.
patent: 5162949 (1992-11-01), Kubota
"Laser and Optics Guide II" Japan Melles Griot Inc., pp. 122-124 Jun. 1989.

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