US PATENT SUBCLASS 369 / 44.23
.~.~.~ Structure for shaping beam or causing astigmatic condition

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.~.~.~ Structure for shaping beam or causing astigmatic condition {1}
44.24  DF  .~.~.~.~> Means to mask or shield a portion of the beam

DEFINITION

Classification: 369/44.23

Structure for shaping beam or causing astigmatic condition:

(under subclass 44.14) Subject matter having means to modify the cross-sectional profile or energy distribution of the beam or cause an astigmatic beam condition.

(1) Note. The phrase "shaping beam" is intended to include changing the intensity distribution characteristics or cross-sectional profile or size/diameter of the beam (e.g., for beam intensity control etc.) but not for routine focus control which inherently alters the beam size/diameter.

(2) Note. An "astigmatic" condition may be created by a cylindrical or unidirectional lens.

(3) Note. Astigmatic is defined as a spherical aberration.