Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-08-05
1996-04-16
Young, W. R.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 4427, 369 50, 369190, G11B 2736
Patent
active
055089879
ABSTRACT:
An object of this invention is to provide a disk player in which a plurality of disks different in diameter are driven, and can be identified with high accuracy. Disclosed is the disk player, a digital signal processing section applies to a CPU a synchronization signal which is raised to high level when the frequency of a detection signal outputted by a laser pickup reaches a predetermined value which permits a data reading operation, and a sense signal which is raised to high level when the frequency of the detection signal is shifted from a predetermined frequency. The CPU operates to rotate a spindle motor, and to brake the latter when the synchronization signal is raised to high level. The CPU further operates to detect a period of time which lapses from the time instant the motor is braked until the sense signal is fallen to low level, and to identify the loaded disk from the period of time thus detected.
REFERENCES:
patent: 4653040 (1987-03-01), Senso
patent: 4819221 (1989-04-01), Overath et al.
patent: 5054014 (1991-10-01), Ito et al.
Kataoka Takehiro
Matsunaga Masanori
Takeno Kouichi
Mitsumi Electric Co. Ltd.
Young W. R.
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