Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-06-02
2000-07-18
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022711, H01J 314
Patent
active
060910674
ABSTRACT:
An optical scanner employs a cantilever-mounted optical fiber within a micro electro-mechanical systems (MEMS) motor. In an embodiment, the fiber is sandwiched between two piezoelectric elements to form a unitary bimorph. The bimorph is excited with opposite polarity to cause it to bend rapidly in a plane. The light collected from the tip is projected to a small spot on the scanned medium. The bimorph is oscillated by applying an alternating voltage across the piezoelectric elements which causes the bimorph to bend back and forth at high rates. A medium is passed in a direction at least partly orthogonal to the direction of oscillation of the bimorph so that spot, rapidly sweeping across the surface of the medium, scans the surface. To write information on the medium, a source sufficiently intense, is modulated and applied to the fiber. To read information, a sufficiently intense source is continuously applied to the fiber and a detector used to pick up light returned from the medium surface.
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Drobot Adam Thomas
White Robert Courtney
Le Que T.
Science Applications International Corporation
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