Retrofocus type lens

Details Retrofocus type lens Retrofocus type lens

1991-11-05

1994-04-12

Arnold, Bruce Y.

Optical: systems and elements

Lens

Including a nonspherical surface

359716, 359753, 359784, G02N 302, G02N 1304

Patent

active

053030877

ABSTRACT:
A retrofocus type lens having a plurality of lenses divided into three lens units, or, in the order from a screen, a first lens unit, a second lens unit and a third lens unit, wherein letting the focal length of the entire lens system be denoted by fT, and the distance from a lens surface on the side of an original image to the original image by SK,

REFERENCES:
patent: 3832035 (1974-08-01), Takahashi
patent: 3926506 (1975-12-01), Maeda
patent: 4008952 (1977-02-01), Nakagawa
patent: 4685774 (1987-08-01), Moskovich
patent: 4704009 (1987-11-01), Yamamoto et al.
patent: 4957355 (1990-09-01), Sato
patent: 4981344 (1991-01-01), Ueda

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