Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

1992-01-31

1993-08-03

Arnold, Bruce Y.

Optical: systems and elements

Lens

Including a nonspherical surface

359793, 359753, G02B 302, G02B 1304, G02B 904

Patent

active

052334740

ABSTRACT:
A retro-focus wide-angle lens system having, in order from the object side, a negative power front group and a positive power rear group having a diaphragm stop. The front group comprises a positive first lens element and a negative meniscus second lens element having a convex surface directed towards the object. The rear group comprises a positive third lens element, a negative fourth lens element having an aspheric surface and a positive fifth lens element. The negative power of the fourth lens element increases toward the outer edge.

REFERENCES:
patent: 2594020 (1952-04-01), Hopkins et al.
patent: 3023672 (1962-03-01), Sandback
patent: 4203653 (1980-05-01), Mori
patent: 4830473 (1989-05-01), Kudo

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