US PATENT SUBCLASS 360 / 78.11
.~.~.~.~ Including nonmagnetic position sensing

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}
78.01  DF  .~.~ Track changing {2}
78.04  DF  .~.~.~ For rotary carrier (e.g., disc) {8}
78.11.~.~.~.~ Including nonmagnetic position sensing

DEFINITION

Classification: 360/78.11

Including nonmagnetic position sensing:

(under subclass 78.04) Subject matter having track changing structure 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 30+ for track selection in a nonmagnetic reproducing arrangement; reproduction transducer; subclasses 100+ for signal reproduction from an optical track; and subclass 126 for signal reproduction from a capacitive track.