Lens barrel

Details Lens barrel Lens barrel

2005-11-08

2005-11-08

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S699000, C359S700000, C359S701000, C359S819000, C396S072000, C396S079000, C396S085000, C396S087000, C396S448000

Reexamination Certificate

active

06963455

ABSTRACT:
A lens barrel includes a holder holding an image pick-up device; a stationary barrel having a female helicoid; a gear/helicoid ring including an annular rib, a male helicoid formed on the annular rib and engaged with the female helicoid, and a spur gear formed on the male helicoid; a pinion engaged with the spur gear; a linear guide ring provided around the gear/helicoid ring; a outer circumferential groove formed on the gear/helicoid ring; and bayonet lugs projecting rearwards from the linear guide ring and engaging in the circumferential groove. Rotation of the gear/helicoid ring causes a lens group to move along the optical axis. At least a portion of a rear end of the male helicoid extends rearwards. At least a portion of the rear extension portion overlaps the holder in the optical axis direction when the gear/helicoid ring stops retracting at a predetermined position.

REFERENCES:
patent: 5144493 (1992-09-01), Nomura
patent: 5164757 (1992-11-01), Nomura
patent: 5488513 (1996-01-01), Tanaka
patent: 5589987 (1996-12-01), Tanaka
patent: 5640615 (1997-06-01), Nomura et al.
patent: 5815744 (1998-09-01), Ohmiya
patent: 5940226 (1999-08-01), Tanaka
patent: 6520691 (2003-02-01), Nomura et al.
patent: 6819502 (2004-11-01), Nomura et al.
patent: 11-044835 (1999-02-01), None
patent: 2001-215562 (2001-08-01), None

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