Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-10-09
2007-10-09
Korzuch, William (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044290
Reexamination Certificate
active
10470727
ABSTRACT:
A positioning control device and method in which the relative position error in tracking is reduced by using the periodicity of position shift. The positioning control device comprises a position detecting unit for measuring the relative position error between the desired position of an objective member and a moving member, an adding unit for adding a position error signal output from the position detecting unit and a delay signal, a signal delay unit for outputting the delay signal which is obtained by delaying an output of the adding unit at a period corresponding to the position shift of the objective member, a drive unit for moving a moving member, and an inputting unit for inputting the signal of the sum of the position error signal and the delay signal to the drive unit and addition-inputting the delay signal to the drive unit through a filter having a predetermined frequency characteristic in a specific frequency range.
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Japanese Application Publication No. 2001-126421 machine translation, Oonuki Yoshikazu, Disk drive device and head positioning controlling method for the device, May 11, 2001.
Iwasawa Naotoshi
Kubota Masashi
Shimonou Sigeru
Haley Joseph
Korzuch William
Nec Corporation
Sughrue & Mion, PLLC
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