Photography – Camera detail – Shutter
Reexamination Certificate
2007-02-06
2007-02-06
Perkey, W. B. (Department: 2851)
Photography
Camera detail
Shutter
C396S450000, C396S483000, C396S505000
Reexamination Certificate
active
11042310
ABSTRACT:
Provided is a light amount control device eliminating a deviation in image forming position over the entire area of the variable range of an aperture due to an ND filter and assuring smooth stopping operation. The light amount control device of the present invention includes: a first shading member and a second shading member which are adapted to move within a plane perpendicular to an optical axis to vary an area of a light passage opening; a lever member which is connected with the first shading member and the second shading member and which is rotatable; an actuator for driving the lever member; and an ND filter mounted to the first shading member. The ND filter is configured to cover an entirety of the light passage opening in an open state, and the second shading member has a guard portion which, with the light passage opening being in a closed state, is arranged between the lever member and the ND filter, preventing the ND filter from coming into contact with the lever member.
REFERENCES:
patent: 6533473 (2003-03-01), Edamitsu et al.
patent: 2005/0123290 (2005-06-01), Hasegawa et al.
patent: 2006/0039695 (2006-02-01), Naganuma
patent: H07-028123 (1995-01-01), None
Cowan Liebowitz & Latman P.C.
Liu Chia-how Michael
Perkey W. B.
LandOfFree
Light amount control device and optical apparatus with guard... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Light amount control device and optical apparatus with guard..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light amount control device and optical apparatus with guard... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3890395