Patent
1987-06-15
1989-01-31
Sikes, William L.
350 9613, 350 9619, G02B 610
Patent
active
048011843
ABSTRACT:
Apparatus for writing and/or reading information on a recording element comprises an integrated optical write/read head of the type comprising a planar optical waveguide and means for deflecting a guided beam of radiation out of the waveguide at an egress zone and for bringing such beam to a focused spot on a desired data track on the recording element. Means, responsive to any displacement of such focused spot from a desired data track, is provided for selectively varying the effective refractive index of the waveguide in the vicinity of the egress zone in order to vary the tracking position of the spot. Such means comprises a pair of spaced parallel electrodes in close proximity to the egress zone, and means for producing an electric field between such electrodes, such field varying with the tracking error.
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Eastman Kodak Company
Kurz Warren W.
Sikes William L.
Wise Robert E.
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