Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2006-10-31
2006-10-31
Edun, Muhammad (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S116000, C369S120000, C369S124040
Reexamination Certificate
active
07130254
ABSTRACT:
The invention relates to a reproduction or recording apparatus for different optical recording media, which differ for example with regard to their storage density, are scanned by different means and have a photodetector arrangement that is jointly used for the different recording media and scanning means, which arrangement provides a photodetector signal which is independent of the absolute light power level of the laser diodes. For generating the photodetector signal which is independent of the absolute light power level of the laser diodes, a switch for changing over the sensitivity of the photodetector is provided, which switch is controlled by the modulator for generating a uniform light power with a laser diode. A connecting line to the basic apparatus and corresponding terminals for controlling the switch are advantageously obviated as a result. The application of the invention is envisaged for reproduction or recording apparatuses of different optical recording media in which a modulation of the laser current is provided for generating a uniform light power.
REFERENCES:
patent: 2004/0105364 (2004-06-01), Chow et al.
patent: 2005/0122880 (2005-06-01), Tatsuno et al.
patent: 2006/0007837 (2006-01-01), Arai et al.
patent: 426035 (1991-05-01), None
patent: 1067529 (2001-01-01), None
patent: 3-17840 (1991-01-01), None
patent: 2001/266388 (2001-09-01), None
Patent Abstracts of Japan, vol. 2000, No. 26, Jul. 1, 2002 & JP 2001/266388 (See Ref. AC).
Patent Abstracts of Japan, vol. 15, No. 140, Apr. 9, 1991 & JP 3-17840 (See Ref. AD).
Copy of Search Report Dated Mar. 14, 2003.
Edun Muhammad
Laks Joseph J.
Lin Reitseng
Shedd Robert D.
Thomson Licensing
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