US PATENT SUBCLASS 369 / 44.24
.~.~.~.~ Means to mask or shield a portion of the beam

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

43  DF  WITH SERVO POSITIONING OF TRANSDUCER ASSEMBLY OVER TRACK COMBINED WITH INFORMATION SIGNAL PROCESSING {1}
44.11  DF  .~ Optical servo system {12}
44.14  DF  .~.~ Optical head servo system structure {4}
44.23  DF  .~.~.~ Structure for shaping beam or causing astigmatic condition {1}
44.24.~.~.~.~ Means to mask or shield a portion of the beam

DEFINITION

Classification: 369/44.24

Means to mask or shield a portion of the beam:

(under subclass 44.23) Subject matter wherein a modification is performed by masking or shielding a cross-sectional portion of the beam.

(1) Note. The masking or shielding can be caused by one photodetector blocking a portion of the beam from falling onto another photodetector.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44.42, where the servo system has arithmetic operations performed on plural detectors outputs and the servo system is responsive to a particular shape of the beam by virtue of the beam or detector being that shape.