Optical: systems and elements – Lens – Multiple component lenses
Patent
1994-02-28
1997-09-09
Phan, James
Optical: systems and elements
Lens
Multiple component lenses
359717, 359739, G02B 906
Patent
active
056662343
ABSTRACT:
An optical system composed of two lens elements and a postpositional aperture stop, which are arranged in such a manner as to facilitate mounting on a casing of a camera or lens-equipped photographic film package and to suppress spherical aberration to ensure high quality performance from center to peripheral regions despite asymmetric lens disposition. The optical system includes, from the object side, a first lens element L.sub.1, a second lens element L.sub.2, and a postpositional aperture stop D located behind the second lens element on the side of the image field. The first lens element is a positive meniscus having a convex surface disposed on the object side, and the second lens element is a biconvex lens. Alternatively, the first lens element is a biconvex lens, and the second lens element is a positive meniscus having a convex surface disposed on the side of the image field. The image surface of the optical system is curved in a convace shape on the object side.
REFERENCES:
patent: 2610546 (1952-04-01), Rubin
patent: 4932764 (1990-06-01), Simpson, Jr.
patent: 5000552 (1991-03-01), Simpson, Jr. et al.
patent: 5327291 (1994-07-01), Baker et al.
Fuji Photo Optical Co., Ltd.
Phan James
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