Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-10-24
1998-05-05
Dinh, Tan
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369190, G11B 390
Patent
active
057485917
ABSTRACT:
A disk drive capable of determining the diameter of the currently loaded disk in a short time without the use of additional attachments such as optical sensors. Servo gains are first set to permit rotation of a 12-cm CD, and the servo is turned on. The CD is rotated at a steady rotational speed regardless of its diameter. The servo is turned off when a sub-code synchronizing signal is detected from the CD. Acceleration pulses are generated to start accelerating the spindle motor simultaneously with the starting of a timer. The timer is stopped when the next sub-code synchronizing signal is detected, and the servo is again turned on. If the value on the timer is longer than a reference time, the loaded CD is found to be a 12-cm CD and the appropriate servo gains are set for the 12-cm CD; if the timer value is shorter than the reference time, the CD is found to be an 8-cm CD and the servo gains are set accordingly.
REFERENCES:
patent: 4302833 (1981-11-01), Tanaka et al.
patent: 4653040 (1987-03-01), Senso
patent: 4773052 (1988-09-01), Sugiura et al.
patent: 5042025 (1991-08-01), Aoyagi et al.
patent: 5172354 (1992-12-01), Otsubo
patent: 5508987 (1996-04-01), Matsunaga et al.
Dinh Tan
Sony Corporation
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