Title:
COMPATIBLE RECORDER AND/OR REPRODUCER
Document Type and Number:
Japanese Patent JP3658858
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To use without changing wavelengths of used laser and changing the numerical operture of an object lens irrespective of a data carrier of different memory density.
SOLUTION: In order to operate optical data carriers IT1, IT2 of different memory density, wavelengths and the numerical operture which adjusts supreme memory density are provided, a plurality of auxiliary beams E, F, G, H which adjust respective track widths are provided and an optical system having pairs of a plurality of auxiliary beam detectors corresponding to a plurality of different data carriers is used. Thereby, in a compatible memory device and/or regenerator, each of data of the optical data carrier IT2 of low memory density, namely a data signal, is reconstructed using means for detecting rising of a signal of the data carrier IT2 detected from the data carrier IT2 by a main beam M.
Inventors:
Hartmut Richter
Application Number:
JP12285996A
Publication Date:
June 08, 2005
Filing Date:
April 22, 1996
Export Citation:
Assignee:
DEUTSCHE THOMSON-BRANDT GMBH
International Classes:
G11B7/00; G11B7/0037; G11B7/005; G11B7/09; G11B7/13; G11B7/135; (IPC1-7): G11B7/135; G11B7/09
Domestic Patent References:
| JP3232123A | ||||
| JP1302543A | ||||
| JP7073532A | ||||
| JP5266484A |
Attorney, Agent or Firm:
Keiichi Yamamoto
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