Bright triplet

Details Bright triplet Bright triplet

1994-10-07

1997-03-25

Sugarman, Scott J.

Optical: systems and elements

Lens

Multiple component lenses

359716, G02B 914

Patent

active

056150512

ABSTRACT:
The invention provides a high-performance, bright and compact triplet that has a zoom ratio of about 1.05 with an wide field angle, said triplet comprising, in order from the object side, a first lens L1 consisting of a positive single lens of glass in a meniscus form convex on the object side, a second lens L2 located with an air separation between it and said first lens L1 and consisting of a negative single lens of glass, a third lens L3 located with an air separation between it and said second lens L2 and consisting of a positive single lens of glass in a double-convex form, and an aperture stop S located on the image side of said third lens, at least two of said first to third lenses having aspherical surfaces, and conforming to the following conditions n.sub.1 >1.6, n.sub.3 >1.6 wherein n.sub.1 and n.sub.3 are the refractive indices of said first and third lenses, respectively.

REFERENCES:
patent: 3967884 (1976-07-01), De Jager
patent: 4542961 (1985-09-01), Sato
patent: 4787724 (1988-11-01), Kudo et al.
JP Patent Abstract--4-9711--Mar. 1992.
JP Patent Abstract--4-76510--Mar. 1992.
JP Patent Abstract--1-261613--Oct. 1989.
JP Patent Abstract--1-134412--May 1989.
JP Patent Abstract--1-133016--May 1989.
JP Patent Abstract--62-183420--Aug. 1987.
JP Patent Abstract--59-34510--Feb. 1984.
JP Patent Abstract--63-96620--Apr. 1988.

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