Zoom lens having a long back focal length

Details Zoom lens having a long back focal length Zoom lens having a long back focal length

1991-11-05

1994-07-19

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359651, 359716, 359784, G02B 1514, G02B 1318, G02B 912

Patent

active

053314620

ABSTRACT:
In a retro-focus type lens divided into three lens units by the widest air spacing and the next widest air spacing, a first lens unit is disposed on a long conjugate side and has negative refractive power, and includes a negative lens and a lens provided with an aspherical surface, a second lens unit is disposed subsequently to the first lens unit and provided with a positive lens block, and a third lens unit is disposed subsequently to the second lens unit and has positive refractive power, and includes a negative lens and a positive lens.

REFERENCES:
patent: 3663095 (1972-05-01), Mori
patent: 3832035 (1974-08-01), Takahashi
patent: 3992085 (1976-11-01), Momiyama
patent: 4111558 (1978-09-01), Ikemori
patent: 4310222 (1982-01-01), Ikemori

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