Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-05-10
1995-01-10
Young, W. R.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, 369116, G11B 700
Patent
active
053813928
ABSTRACT:
An optical disc reproducing apparatus reproduces an optical disc having an information recording surface on which record information and control information are recorded. The apparatus is provided with: a device for rotationally driving the optical disc; a reading device for forming a light spot on the information recording surface, and receiving a reflected light to generate a read signal of the reflected light; a device for reproducing the record information and the control information from the read signal; a device for detecting whether a focus of the light spot is normal or not according to the read signal; a device for detecting whether a rotation number of the optical disc is normal or not according to the read signal; and a device for discriminating the optical disc on the basis of conditions of the detected focus and the detected rotation number.
REFERENCES:
patent: 4989195 (1991-01-01), Suzuki
patent: 5140575 (1992-08-01), Fushiki
patent: 5289451 (1994-02-01), Ashinuma et al.
patent: 5315570 (1994-05-01), Miura et al.
patent: 5317549 (1994-05-01), Maeda et al.
Hindi Nabil
Pioneer Electronic Corporation
Young W. R.
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