Focus servo actuator for moving lens scanners

Details Focus servo actuator for moving lens scanners Focus servo actuator for moving lens scanners

1989-09-06

1992-04-21

Arnold, Bruce Y.

Optical: systems and elements

Lens

With support

359205, 359823, G02B 702, G02B 2608

Patent

active

051073722

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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patent: 4811320 (1989-03-01), Kawasaki et al.
patent: 4842392 (1989-06-01), Nakamura et al.

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