Interchangeable lens

Details Interchangeable lens Interchangeable lens

2007-05-15

2007-05-15

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S557000, C359S396000, C359S683000, C359S686000, C359S766000, C359S773000, C396S052000, C396S055000, C348S208110

Reexamination Certificate

active

11237744

ABSTRACT:
Providing an interchangeable lens capable of carrying out quick focus from infinity to a close object with a magnification of almost life size by a light-weight moving lens group, exhibiting excellent imaging performance across an entire focusing range, and obtaining excellent imaging performance by a vibration reduction lens and its drive system appropriately arranged even upon vibration reduction. The lens includes a first group having positive power, a second group having negative power, a third group having positive power, and a fourth group having negative power. The fourth group includes a front group having negative power and a rear group having positive power. When the lens is vibrated, the lens corrects image blur by shifting the front group almost perpendicularly to an optical axis. When focusing from infinity to a close object, the first and the front groups are fixed and at least the third group is moved toward the object side.

REFERENCES:
patent: 4986643 (1991-01-01), Moriyama
patent: 6025962 (2000-02-01), Suzuki
patent: 6246833 (2001-06-01), Harada
patent: 6825994 (2004-11-01), Harada
patent: 2-19814 (1990-01-01), None
patent: 2000-231056 (2000-08-01), None
patent: 2001-272601 (2001-10-01), None
patent: 2005-284101 (2001-10-01), None
patent: 2002-090622 (2002-03-01), None
patent: 2003-322797 (2003-11-01), None

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