US PATENT SUBCLASS 369 / 44.27
.~.~ Initialization/start-up or changing modes of 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  DF  .~ Optical servo system {12}
44.27.~.~ Initialization/start-up or changing modes of system {2}
44.28  DF  .~.~.~> While track jumping or crossing
44.29  DF  .~.~.~> Servo loop gain/switching control {1}

DEFINITION

Classification: 369/44.27

Initialization/start-up or changing modes of system:

(under subclass 44.11) Subject matter wherein the servo system is affected by a change of mode in operation at the beginning of system operation or a change of mode during system operation.

(1) Note. "Random accessing" or indexing concepts may be classified herein if no specific "selective addressing" or feedback indication of arriving at a particular track address occurs.

(2) Note. The action taken by the servo system must be outside or beyond its normal routine ongoing continuous servo operation.

(3) Note. Varying the servo system control during a change between recording and playback or tracking modes due to the information format of the disc is classified above in subclass 44.26.

(4) Note. Examples of initialization/start-up are first track recording and track jumping or crossing during a random access type of operation.

(5) Note. Examples of mode change during operation are: switching between coarse/fine servo control as servo operation begins/changes modes, and the servo system responding to some user initiated operation.

SEE OR SEARCH THIS CLASS, SUBCLASS: 30, 32 or 33, for random accessing systems with selective addressing.

44.11, for generic recording systems without recitation of plural beams.

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

44.34, for sampling or digital techniques not associated with the criteria for subclass 44.27.

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