Focus servo actuator for moving lens scanners
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United States of America Patent
Stats
-
Apr 21, 1992
Grant Date -
N/A
app pub date -
Sep 6, 1989
filing date -
Sep 6, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for focusing a rapidly moving scanning lens is disclosed. The lens is mounted onto a ferromagnetic insert which is attached to the scanning assembly. A stationary electromagnet generates a uniform magnetic field along the path of the scanning lens. This field is coupled to the ferromagnetic insert via a second ferromagnetic insert which is rigidly mounted to the scanning assembly. Changing the current in the electromagnet changes the position of the scanning lens and enables it to focus on the scanned object.
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Cited Art Landscape
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