Compact zoom lens with positive power front lens group and negat

Details Compact zoom lens with positive power front lens group and negat Compact zoom lens with positive power front lens group and negat

1991-08-28

1992-05-12

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With variable magnification

359680, 359683, G02B 1500

Patent

active

051132877

ABSTRACT:
A high-magnification zoom lens having a compact size has a front lens group of positive refractive power and a rear lens group of negative refractive power which groups are aligned in that order from the object side. The front lens group includes five lens elements and satisfies the following conditions.

REFERENCES:
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patent: 4679913 (1987-07-01), Sato et al.
patent: 4682860 (1987-07-01), Tanaka et al.
patent: 4721371 (1988-01-01), Imai
patent: 4770508 (1988-09-01), Yamada et al.
patent: 4776679 (1988-10-01), Kitagishi et al.
patent: 4815830 (1989-03-01), Sato et al.
patent: 4830474 (1989-05-01), Nakayama et al.
patent: 4838669 (1989-06-01), Ogata et al.
patent: 4842386 (1989-06-01), Kitagishi et al.

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