Imaging lens

Optical: systems and elements – Lens – Multiple component lenses

Reexamination Certificate

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Details

C359S689000, C359S680000, C359S770000

Reexamination Certificate

active

07068447

ABSTRACT:
The pickup lens (1) employing the present invention includes a first lens group (11) having negative power, a diaphragm (12), a second lens group (13) having positive power, and a third lens group (14) having negative power, which are arranged in this order from the side of a subject. When varying optical power, in the pickup lens (1), the first lens group (11) is fixed, and the second lens group (13) is moved along the optical axis together with the diaphragm (12), and the third lens group (14) is moved along the optical axis to correct movement of the image point due to variation of optical power.

REFERENCES:
patent: 5805350 (1998-09-01), Yamamoto
patent: 6052234 (2000-04-01), Mukai et al.
patent: 6075653 (2000-06-01), Narimatsu et al.
patent: 6317270 (2001-11-01), Nagaoka
patent: 6606201 (2003-08-01), Hirose
patent: 2003/0210471 (2003-11-01), Mihara et al.
patent: 5-323190 (1993-12-01), None
patent: 7-120678 (1995-05-01), None
patent: 2000-330024 (2000-11-01), None
patent: 92/21048 (1992-11-01), None
patent: 96/19749 (1996-06-01), None

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