Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-02-13
1999-10-05
Dinh, Tan
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
G11B 390
Patent
active
059635231
ABSTRACT:
In an optical recording and reproducing apparatus, two light sources such as a laser diode of different wavelengths from each other are provided, and photosensors receive the light emitted by the light sources and reflected by the optical recording medium. Before recording or reproduction is started, the type of optical recording medium having a different wavelength dependent reflectance is discriminated. Because two wavelengths are used, the difference of the outputs is large, and the type of the optical recording medium is discriminated reliably according to the outputs of the photosensors. Then, the operation of the apparatus is stabilized according to the type of the optical recording medium by optimizing the laser power, the gain of the controller, the revolution number of the medium or the like.
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patent: 5684773 (1997-11-01), Hayashi
Imanaka Ryoichi
Kayama Hiroshi
Saimi Tetsuo
Dinh Tan
Matsushita Electric - Industrial Co., Ltd.
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