EP 1579429 A2 20050928 - OPTICAL READING DEVICE FOR WRITING/READING ON/FROM MULTI-LAYER OPTICAL DISKS
Title (en)
OPTICAL READING DEVICE FOR WRITING/READING ON/FROM MULTI-LAYER OPTICAL DISKS
Title (de)
OPTISCHE LESEEINRICHTUNG ZUM BESCHREIBEN/LESEN VON MEHRSCHICHTIGEN OPTISCHEN DATENTRÄGERN
Title (fr)
DISPOSITIF DE LECTURE OPTIQUE DESTINE A LA LECTURE/ECRITURE DE/SUR DISQUES OPTIQUES MULTICOUCHES
Publication
Application
Priority
- US 0219979 W 20020625
- US 30005501 P 20010625
Abstract (en)
[origin: WO03001512A2] An optical information reader for writing/reading of multi-layer optical disks utilizing light beam from the light source directed to optical carrier by the lens and receiving reflected or fluorescent light is described. An optical reader includes the device for the reception of reflected of fluorescent light and the detector of the disk writing/reading layer with the aim to determine a required value of compensation or correction of spherical aberration compare to the calculated one. The writing layer detector is controlling the reflected or fluorescent light signal obtained from information layer of carrier. Optical reader includes also a piezo-ceramic optical element resided in a light beam that is directed from light source to the carrier. This piezo-element has a phase difference between central and peripheral zones that depend on sign and value of voltage applied to it. An optical reader can determine a value and sign of optical aberration with high accuracy. Piezo-ceramic element reduces a spherical aberration to the accepted level at any writing layer and at any radial position of spot on record track. In such a way the average value of spherical aberration and its current value mediated by fluctuation of record layer thickness will be reduced. A piezo-ceramic device reduces aberrations by using the phase differences change between its central and peripheral zones as result of current change of record layer thickness.
IPC 1-7
IPC 8 full level
G11B 7/09 (2006.01); G11B 7/135 (2012.01); G11B 7/00 (2006.01)
CPC (source: EP)
G11B 7/1369 (2013.01); G11B 7/13927 (2013.01); G11B 2007/0013 (2013.01)
Citation (search report)
See references of WO 03001512A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 03001512 A2 20030103; WO 03001512 A3 20081023; AU 2002315429 A1 20030108; AU 2002315429 A8 20081120; CN 101366085 A 20090211; EP 1579429 A2 20050928; JP 2005508559 A 20050331
DOCDB simple family (application)
US 0219979 W 20020625; AU 2002315429 A 20020625; CN 02816160 A 20020625; EP 02742281 A 20020625; JP 2003507811 A 20020625