EP 1062663 A1 20001227 - OPTICAL PICKUP DEVICE
Title (en)
OPTICAL PICKUP DEVICE
Title (de)
OPTISCHE ABTASTVORRICHTUNG
Title (fr)
SYSTEME OPTIQUE DE SAISIE
Publication
Application
Priority
- JP 9901090 W 19990305
- JP 7644098 A 19980311
Abstract (en)
[origin: WO9946767A1] Data can be read at high speed from an optical disk (20) by using a plurality of light spots, and data can be written in the optical disk (20) by using a single light spot without any practical problem. In reading data from the optical disk (20), a diffraction grating (13) is inserted between a semiconductor laser (12) and an objective lens (15). A laser beam from the semiconductor laser (12) is diffracted by the diffraction grating (13) to generate diffracted light beams (16b, 16c) and form a plurality of light spots (32a, 32b, 32c) on a plurality of tracks (3) of the optical disk (20). In writing data in the optical disk (20), the diffraction grating (13) is exited from between the semiconductor laser (12) and objective lens (20). Only a non-diffracted light beam (16a) is incident upon the objective lens (15) to form a single light spot (32a) on the optical disk (20).
IPC 1-7
IPC 8 full level
G11B 7/125 (2006.01); G11B 7/135 (2006.01); G11B 7/0045 (2006.01); G11B 7/14 (2012.01)
CPC (source: EP KR)
G11B 7/085 (2013.01 - KR); G11B 7/127 (2013.01 - KR); G11B 7/1353 (2013.01 - EP KR); G11B 7/1365 (2013.01 - EP); G11B 7/1369 (2013.01 - EP KR); G11B 7/1381 (2013.01 - EP); G03H 2222/31 (2013.01 - KR); G11B 7/0045 (2013.01 - EP); G11B 7/14 (2013.01 - EP); G11B 2220/2537 (2013.01 - KR)
Citation (search report)
See references of WO 9946767A1
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
WO 9946767 A1 19990916; CN 1292917 A 20010425; DE 1062663 T1 20010705; EP 1062663 A1 20001227; KR 20010041682 A 20010525; TW 548643 B 20030821
DOCDB simple family (application)
JP 9901090 W 19990305; CN 99803714 A 19990305; DE 99907875 T 19990305; EP 99907875 A 19990305; KR 20007009899 A 20000907; TW 88102191 A 19990211