Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-05-03
1998-10-13
Huber, Paul W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369110, 369 95, G11B 700, G11B 374
Patent
active
058222928
ABSTRACT:
A multi beam track system and method is used for the retrieving of information stored in optical memories like optical disks. The information carrying beams reflected on the surface of such a optical disk results in spots on the surface of a detector array. Because these beams are very close to each other, the resulting spots tend to overlap so that cross talk conditions between neighboring channels occur. As result the S/N ratio becomes worse. According to the present invention a plurality of laser beams arranged in a row is used, where the laser beams are linear polarized and the polarization of neighboring beams differ by 90.o slashed., i.e. neighboring laser beams have perpendicular linear polarization. After reflection on the surface of the optical disk the row of reflected laser beams is separated into two rows by an separating means which is polarization dependent so that beams are separated in space according to the polarization. Such a separator can be a polarizing beamsplitter or a birefringent prism crystal. As a result two spacially separated rows of laser beams are achieved, which can be detected by two separate detectors. As result no overlap between neighboring spots occurs on the surface of the detectors, resulting in the elimination of crosstalk.
REFERENCES:
patent: 4607359 (1986-08-01), Matsubayashi et al.
patent: 5144616 (1992-09-01), Yasukawa et al.
patent: 5202860 (1993-04-01), Takahashi et al.
patent: 5260927 (1993-11-01), Higashihara et al.
patent: 5289313 (1994-02-01), Matsuoka
patent: 5353274 (1994-10-01), Nishikawa
patent: 5483511 (1996-01-01), Jewell et al.
patent: 5526338 (1996-06-01), Hasman et al.
patent: 5528576 (1996-06-01), Nishikawa
Akutsu Nakao
Chikazawa Yoshiharu
Kawamura Akira
Morimoto Yasuaki
Huber Paul W.
Thomson Multimedia S.A.
Tripoli Joseph S.
Wein Frederick A.
LandOfFree
Multi beam track system and method for an optical memory does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi beam track system and method for an optical memory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi beam track system and method for an optical memory will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-320707