Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-05-03
2005-05-03
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S078060, C360S078050
Reexamination Certificate
active
06888695
ABSTRACT:
An information recording and reproducing apparatus having a high track density, a high recording density in each of the tracks, and a short seeking time. In a seeking operation, a control circuit performs a calculation required for the seeking operation and then sets, to (f=fs), a drive pulse frequency f for a tracking control to be supplied to a piezoelectric element based on the calculation result. A drive circuit outputs a drive pulse of the frequency f corresponding to the input drive pulse to an actuator, so that a recording and reproducing head is moved near a target track. In a following operation, the control circuit performs a calculation required for following operation and then sets, to (f=ft, wherein fs>ft), the drive pulse frequency f to be supplied to the piezoelectric element based on the calculation result.
REFERENCES:
patent: 6417983 (2002-07-01), Yatsu
patent: 6721124 (2004-04-01), Chang et al.
patent: 20010036035 (2001-11-01), Morris et al.
patent: 2001-76443 (2001-03-01), None
patent: 2001-211669 (2001-08-01), None
Faber Alan T.
McDermott Will & Emery LLP
Minolta Co. , Ltd.
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