US PATENT SUBCLASS 369 / 44.11
.~ Optical servo system

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.~ Optical servo system {12}
44.12  DF  .~.~> Solid state optical element with plural dissimilar optical components (e.g., using I.C. block, etc.)
44.13  DF  .~.~> Dithering or wobbling the beam or track
44.14  DF  .~.~> Optical head servo system structure {4}
44.25  DF  .~.~> Servo signal compared to a reference signal
44.26  DF  .~.~> Servo system operation related to disc structure information format
44.27  DF  .~.~> Initialization/start-up or changing modes of system {2}
44.32  DF  .~.~> Means to compensate for defect or abnormal condition {1}
44.34  DF  .~.~> Sampling servo system
44.35  DF  .~.~> Servo loop gain/switching control {1}
44.37  DF  .~.~> Plural incident beams {1}
44.39  DF  .~.~> Recording
44.41  DF  .~.~> Arithmetic operation using plural photodetectors {1}

DEFINITION

Classification: 369/44.11

Optical servo system:

(under subclass 43) Subject matter wherein the servo positioning is controlled by a radiant energy transducer.

(1) Note. The transducer may be either an information sensing transducer or an auxiliary transducer. Incidental recitation of focusing or tracking, or a servo system therefor, is not enough to permit classification here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44.27, for recording systems with initialization/startup/changing modes concepts.

44.32, for recording systems with defect/abnormal condition concepts.

44.38, for a recording system claimed in a plural beam system.

47, and 51, for optical information storage or retrieval systems where a pilot signal is used.

93+, for optical systems using plural distinct independent tracks. 100+, for optical systems with specific detail of information handling portion of system.

SEE OR SEARCH CLASS

250, Radiant Energy,

201.1+, for optical tracking devices in radiant energy systems, per se.