Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1989-02-07

1990-05-15

Arnold, Bruce Y.

350426, 350427, G02B 1514, G02B 964

Patent

active

049252801

ABSTRACT:
A compact, light-weight vari-focal lens system manufacturable at low cost comprising a negative front lens group and a positive rear lens group, said front lens group consisting of a first positive lens unit and a second lens unit having a vari-focal function, said rear lens group having an imaging function and used for correcting deviation of the image point caused due to variation of focal length, said second lens unit consisting of a negative lens component and a positive lens component, and said vari-focal lens system comprising at least one aspherical surface.

REFERENCES:
patent: 3160699 (1964-12-01), Yamaji
patent: 3972592 (1976-08-01), Ruben
patent: 4447135 (1984-05-01), Nakamura
patent: 4802747 (1989-02-01), Horiuchi

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