Super wide angel lens system using an aspherical lens

Details Super wide angel lens system using an aspherical lens Super wide angel lens system using an aspherical lens

1997-08-21

1999-01-19

Sugarman, Scott J.

Optical: systems and elements

Lens

Reverse telephoto

359713, 359753, G02B 1304, G02B 1318

Patent

active

058619992

ABSTRACT:
A retrofocus type super wide angle lens system includes a front lens group of negative power and a rear lens group of positive power, arranged in this order from the object side. The front lens group consists of a negative meniscus first lens element with a convex surface facing the object side and a second lens element having at least one aspherical surface, arranged in this order from the object side. The aspherical second lens element is shaped such that it forms a biconcave lens in the vicinity of the optical axis and forms a negative meniscus lens with a convex surface located on the object side at a peripheral portion thereof.

REFERENCES:
patent: 3506339 (1970-04-01), Kazamaki
patent: 3856385 (1974-12-01), Takahashi
patent: 4952040 (1990-08-01), Igarashi
patent: 4957355 (1990-09-01), Sato
patent: 5477388 (1995-12-01), Ishiyama et al.

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