Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1990-07-13

1991-04-02

Sugarman, Scott J.

350432, G02B 1514, G02B 1318

Patent

active

050043293

ABSTRACT:
A vari-focal lens system comprising a plurality of lens units including a lens unit arranged on the extremely image side and having a negative refractive power, and adapted so as to perform variation of focal length by moving the lens units, said negative lens unit being composed, in the order from the object side, of a front subunit consisting of at least one negative lens unit and a rear subunit consisting of at least one negative lens element.

REFERENCES:
patent: 4701033 (1987-10-01), Masumoto
patent: 4773744 (1988-09-01), Yamanashi
patent: 4822152 (1989-04-01), Yamanashi
patent: 4840467 (1989-06-01), Takada et al.
patent: 4854682 (1989-08-01), Yamanashi

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