Owner Symbol Technologies, Inc.

Inventors Breytman, Alex; Krichever, Mark

Agent Spruson & Ferguson

Pub. Number AU-B-2003297988

PCT Number PCT/US2003/0404

PCT Pub. Number WO2004/057518

Priority 60/434,519 18.12.02 US; 10/687,280 15.10.03 US

Filing date 17 December 2003

Wipo publication date 14 July 2004

Acceptance publication date 13 September 2007

G06K 7/00 (2006.01) Methods or arrangements for sensing record carriers

G06K 7/10 (2006.01) Methods or arrangements for sensing record carriers - by electromagnetic radiation, e.g. optical sensing

G06K 19/14 (2006.01) Record carriers for use with machines and with at least a part designed to carry digital markings - the marking being sensed by radiation

G11B 7/09 (2006.01) Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power - with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following

H01L 41/00 (2006.01) Piezo-electric elements in general