Optical element driving mechanism

Details Optical element driving mechanism Optical element driving mechanism

1994-09-06

1996-09-10

Epps, Georgia Y.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359811, 359824, 369 4414, G01J 120

Patent

active

055548431

ABSTRACT:
An optical element driving mechanism is disclosed wherein an electromagnetic motor positions an optical element such that a laser beam passing through the optical element is focused onto an optical disk media. The optical element can be translated in two axes by energizing coils suspended within stationary magnetic fields produced by permanent magnets. The magnitude and direction of displacement is controlled by the current passing through the coils. A two axis electro-optical position sensing apparatus for determining the position of the optical element is embedded within the driving mechanism. The position sensing apparatus detects the relative position of the optical element in two axes by imaging a light emitting diode onto a four element photodetector.

REFERENCES:
patent: 4660190 (1987-04-01), Fujii et al.
patent: 4956833 (1990-09-01), Kokado et al.
patent: 5297114 (1994-03-01), Itoh et al.

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