Telephoto zoom lens system

Details Telephoto zoom lens system Telephoto zoom lens system

1986-05-30

1989-03-28

Corbin, John K.

350423, C02B 1516

Patent

active

048158291

ABSTRACT:
A telephoto zoom lens system comprising a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group comprising a front subgroup, which has positive refractive power, and a rear subgroup, the telephoto zoom lens system being arranged that the focal length thereof is varied by moving the first, second and third lens groups along the optical axis in the state that the varifocal functions is alloted to the second and third lens groups so that the magnifications of both of them increase at that time, the telephoto zoom lens system being thereby arranged to be small in size, high-performanced and low cost.

REFERENCES:
patent: 4172635 (1979-10-01), Ogino
patent: 4348082 (1982-09-01), Ogawa
patent: 4462664 (1984-07-01), Moskovich
patent: 4478496 (1984-10-01), Kato
patent: 4629294 (1986-12-01), Tanaka et al.
patent: 4639096 (1987-01-01), Kitagishi
patent: 4650291 (1987-03-01), Kato
patent: 4687303 (1987-08-01), Takahashi et al.
patent: 4699475 (1987-10-01), Takahashi et al.
patent: 4729643 (1988-03-01), Kawaguchi et al.

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