Zoom lens having focusing subunit in second lens unit and optica

Details Zoom lens having focusing subunit in second lens unit and optica Zoom lens having focusing subunit in second lens unit and optica

1998-05-27

2000-11-14

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, 359688, 359690, G02B 1514

Patent

active

061478105

ABSTRACT:
A small-sized zoom lens in which the displacement of the focusing lens unit does not increase to an excessive degree during focusing, the zoom lens including a first lens unit of positive refractive power; a second lens unit of negative refractive power; and a subsequent lens unit of positive refractive power in that order from the object side, wherein focusing is effected by a subunit 2b of negative refractive power constituting a part of the second lens unit and wherein, assuming that the magnification of the subunit 2b at the wide-angle end is .beta.2bw, the following condition is satisfied:

REFERENCES:
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patent: 5144488 (1992-09-01), Endo et al.
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patent: 5581404 (1996-12-01), Misaka et al.
patent: 5666230 (1997-09-01), Tatsuno
patent: 5691851 (1997-11-01), Nishio et al.
patent: 5815320 (1998-09-01), Hoshi et al.
patent: 5831772 (1998-11-01), Nishio et al.

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