Focusing method in optical lens system with variable focal lengt

Details Focusing method in optical lens system with variable focal lengt Focusing method in optical lens system with variable focal lengt

1984-10-19

1988-02-23

Corbin, John K.

350423, G02B 15177

Patent

active

047266678

ABSTRACT:
A focusing method in an optical lens system with a variable focal length is composed, in order from an object, of a first lens group having a negative refractive power, and a second lens group having a positive refractive power, with an air gap therebetween being variable for varying the refractive power. The second lens groups is divided into at least two lens groups. At least one of the last-mentioned lens groups is movable simultaneously for focusing and has a magnification which will not be -1 while varying power and focusing.

REFERENCES:
patent: 4447135 (1984-05-01), Nakamura
patent: 4465343 (1984-08-01), Horimoto
patent: 4492437 (1985-01-01), Masumoto et al.
patent: 4516839 (1985-05-01), Tokumaru
patent: 4586793 (1986-05-01), Tanaka et al.

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