EP 0878003 A1 19981118 - MULTIPLE-LAYER OPTICAL DISC AND APPARATUS
Title (en)
MULTIPLE-LAYER OPTICAL DISC AND APPARATUS
Title (de)
MEHRSCHICHTIGE OPTISCHE SCHEIBE UND GERÄT
Title (fr)
DISQUE OPTIQUE MULTICOUCHE ET APPAREIL LE CONTENANT
Publication
Application
Priority
- CA 9500530 W 19950920
- GB 9418914 A 19940920
- GB 9424229 A 19941130
Abstract (en)
[origin: WO9609624A1] An optical data carrier has a pair of spiral tracks of opposite hand that may be read either sequentially or simultaneously. When read simultaneously, the information is recorded at a uniform spatial density and demodulated into a common data stream. The heads reading the tracks are equidistant from a median radius and move along the carrier at a constant radial rate to provide a substantially uniform combined data rate.
IPC 1-7
IPC 8 full level
G11B 7/0037 (2006.01); G11B 7/005 (2006.01); G11B 7/007 (2006.01); G11B 7/12 (2012.01); G11B 7/14 (2006.01); G11B 7/24 (2013.01); G11B 7/24038 (2013.01); G11B 7/24082 (2013.01); G11B 20/10 (2006.01); G11B 7/00 (2006.01)
CPC (source: EP)
G11B 7/0037 (2013.01); G11B 7/005 (2013.01); G11B 7/12 (2013.01); G11B 7/14 (2013.01); G11B 7/24 (2013.01); G11B 7/24038 (2013.01); G11B 7/24082 (2013.01); G11B 20/10 (2013.01); G11B 2007/0013 (2013.01)
Citation (search report)
See references of WO 9609624A1
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9609624 A1 19960328; AU 3468395 A 19960409; CA 2200565 A1 19960328; EP 0878003 A1 19981118
DOCDB simple family (application)
CA 9500530 W 19950920; AU 3468395 A 19950920; CA 2200565 A 19950920; EP 95931111 A 19950920