Focal plane shutter

Details Focal plane shutter Focal plane shutter

2011-03-01

2011-03-01

LaBalle, Clayton E (Department: 2862)

Photography

Camera detail

Shutter

Reexamination Certificate

active

07896561

ABSTRACT:
A focal plane shutter includes: a shutter substrate having an opening; a blade for opening and closing the opening; a drive member swingably supported for driving the blade; a drive spring for driving the drive member; and an adjustment mechanism for adjusting an urging force of the drive spring. One end of the drive spring is engaged with the drive member. The adjustment mechanism includes: an adjustment member engaging the other end of the drive spring and rotatably supported to adjust the urging force of the drive spring; and an engagement member abutting the adjustment member to stop rotation of the adjustment member. The adjustment member has a clearance portion for avoiding abutment against the engagement member at a given rotational position.

REFERENCES:
patent: 4110772 (1978-08-01), Nakagawa et al.
patent: 4401006 (1983-08-01), Sekiguchi
patent: 4963908 (1990-10-01), Toyoda et al.
patent: 5835805 (1998-11-01), Izaki et al.
patent: 5903784 (1999-05-01), Hori
patent: 7404344 (2008-07-01), Erdloff
patent: 2007/0253707 (2007-11-01), Yoshida et al.
patent: 2002-296641 (2002-10-01), None
patent: 2003-66508 (2003-03-01), None
patent: 2007-2891 (2007-01-01), None
patent: 2007-292101 (2007-11-01), None
International Search Report for International Application No. PCT/JP2008/066540 dated Nov. 4, 2008.

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