Photography – Camera detail – Shutter
Patent
1998-12-08
2000-01-25
Perkey, W. B.
Photography
Camera detail
Shutter
G03B 908
Patent
active
060171553
ABSTRACT:
According to one aspect of the present invention, an imaging apparatus includes an annular motor with a central opening and a plurality of lens elements positioned inside the central opening. The motor includes a stator and a homogeneous cylindrical rotor. This rotor is positioned inside the stator and is 0.5 mm to 1.5 mm thick and 2.5 mm to 5 mm long. According to one embodiment of the present invention the rotor is characterized by an outer cylindrical surface defined by its circumference. The rotor has a plurality of magnetic poles, and the ratio of the circumference of the outer cylindrical surface to the number of magnetic poles is between 1 and 2.
REFERENCES:
patent: 4005448 (1977-01-01), Iwata et al.
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patent: 4596449 (1986-06-01), Iwata et al.
patent: 4695144 (1987-09-01), Yoshino et al.
patent: 4828360 (1989-05-01), Maruyama
patent: 5747897 (1998-05-01), Iwasa et al.
patent: 5790903 (1998-08-01), Iwasaki et al.
Bovenzi Robert A.
Depatie Jean F.
Farcella Martin P.
Mayer Teresa C.
Reznik Svetlana
Eastman Kodak Company
Perkey W. B.
Short Svetlana Z.
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