Automatic focal point control for camera

Details Automatic focal point control for camera Automatic focal point control for camera

2011-05-10

2011-05-10

Fuller, Rodney E (Department: 2862)

Photography

With exposure objective focusing means, focusing aid, or...

Mechanical mechanism for displacement of exposure objective

C396S133000

Reexamination Certificate

active

07941043

ABSTRACT:
An automatic focal point control apparatus is provided. The apparatus includes a base fixed in the camera, which includes a cylindrical projection extending from a top surface thereof and into which part of a lens barrel is inserted; a bobbin inserted into the cylindrical projection on the base that includes a plurality of electromagnets around which coils are wound; a rotation body that includes a support ring rotatably connected to the outer circumference of the adaptor and a ring-shaped permanent magnet fixed onto an outer surface of the support ring and that has a plurality of N poles and an equal number of S poles alternately arranged at regular intervals; and a housing detachably mounted on the base that includes a space unit formed inside that includes the bobbin, rotation body and adaptor, and a through hole formed inside so that light and image are projected onto the adaptor.

REFERENCES:
patent: 4519691 (1985-05-01), Yamada et al.
patent: 5835799 (1998-11-01), Washisu
patent: 2004/0174614 (2004-09-01), Hovanky
patent: 2006/0034599 (2006-02-01), Osaka
patent: 2007/0154198 (2007-07-01), Oh et al.
patent: 2005-122026 (2005-05-01), None
patent: 2005-128362 (2005-05-01), None
patent: 2005-266521 (2005-09-01), None
patent: 1005548869 (2006-01-01), None

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