US PATENT SUBCLASS 360 / 77.03
.~.~.~.~ By nonmagnetic sensing (e.g., optical, capacitive)

Current as of: June, 1999
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360 /   HD   DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL

69  DF  AUTOMATIC CONTROL OF A RECORDER MECHANISM {3}
75  DF  .~ Controlling the head {3}
77.01  DF  .~.~ Track centering {2}
77.02  DF  .~.~.~ Rotary carrier {5}
77.03.~.~.~.~ By nonmagnetic sensing (e.g., optical, capacitive)

DEFINITION

Classification: 360/77.03

By nonmagnetic sensing (e.g., optical, capacitive):

(under subclass 77.02) Subject matter responsive to a signal produced in response to a property of the record carrier other than a magnetic property, or by a nonmagnetic auxiliary element.

(1) Note. Such an auxiliary element may include a potententiometer, or an optical grating, mechanically coupled to the transducer element.

SEE OR SEARCH CLASS

369, Dynamic Information Storage or Retrieval,

14, for simultaneous magnetic and nonmagnetic signal reproduction; subclasses 43+ for servo positioning of a nonmagnetic reproduction transducer; subclasses 100+ for signal reproduction from an optical track; and subclass 126 for signal reproduction from a capacitive track.