Two-unit zoom lens system, and exchangeable lens and...

Details Two-unit zoom lens system, and exchangeable lens and... Two-unit zoom lens system, and exchangeable lens and...

2007-07-10

2007-07-10

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

11518067

ABSTRACT:
A two-unit zoom lens system which comprises a negative first lens unit G1and a positive second lens unit G2, during change of magnification from a wide-angle end to a telephoto end, the first lens unit and the second lens unit are moved so as to reduce a space between the first lens unit and the second lens unit, the first lens unit includes a negative sub-unit G1aand a positive sub-unit G1b, the second lens unit has a first positive lens L21, a second negative lens L22, and a third positive lens L23, and the system further has an aperture stop S disposed in an air space which comes into contact with the first positive lens L21.

REFERENCES:
patent: 4993814 (1991-02-01), Hata
patent: 5781349 (1998-07-01), Sugawara
patent: 6229655 (2001-05-01), Kohno et al.
patent: 6456443 (2002-09-01), Kohno et al.
patent: 6532114 (2003-03-01), Kohno et al.
patent: 2001-021806 (2001-01-01), None
patent: 2001-215407 (2001-08-01), None

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