Light quantity adjusting device and photographing device...

Details Light quantity adjusting device and photographing device... Light quantity adjusting device and photographing device...

2008-07-08

2008-07-08

Fuller, Rodney E (Department: 2862)

Photography

Camera detail

Shutter

C396S457000

Reexamination Certificate

active

11159335

ABSTRACT:
A light quantity adjusting device includes a ring-shaped base plate having an exposure aperture at a center thereof, a first light quantity adjusting blade arranged in the exposure aperture, a first drive device for opening/closing the first light quantity adjusting blade, a second light quantity adjusting blade arranged in the exposure aperture, and a second drive device for opening/closing the second light quantity adjusting blade. The first drive device includes a magnet rotor and an exciting coil formed in a ring shape, and a guiding member for inducing a magnetic field to a position facing a magnetic pole formed on a circumference side of the magnet rotor. The second drive device includes a magnet rotor, an exciting coil, and a guiding member for guiding a magnetic field to a position facing a magnetic pole formed on a circumference side of the magnet rotor.

REFERENCES:
patent: 2002/0034390 (2002-03-01), Naganuma
patent: 2002-049076 (2002-02-01), None
patent: 2002-272082 (2002-09-01), None

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