Title:
CONTROL DEVICE FOR ROTATING DISK OF OPTICAL DISK DEVICE
Document Type and Number:
Japanese Patent JP3565879
Kind Code:
B2
Abstract:
PURPOSE: To improve stability of a rotation control of an optical disk by reducing influence of modulation component of a control signal in each case in which N is made 2 or more.
CONSTITUTION: The waveform of a wobble signal passed through a band pass filter 21 is shaped by a wobble comparator 22 and a wobble clock is obtained. Based on this wobble clock, address information is obtained by a portion constituted with a phase comparator 26 and a digital PLL 22 and the like. On the other hand, a frequency of the wobble clock is divided with the prescribed division ratio by a frequency divider 25, and a rotary speed error is detected by the frequency division output in an error detecting circuit 31. This frequency division ratio is set so that a frequency of an output of the frequency divider 25 is made (1/7)×(1/2)×(1/N)×FS based on that a data rate with which a wobble signal is frequency-modulated is (1/7)×FS (44.1kHz) and average frequency of a wobble signal is (1/2)×FS. However, N is integer of 2 or more.
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Inventors:
Hiroyuki Matsuoka
Hirotoshi Yamamoto
Hirotoshi Yamamoto
Application Number:
JP21666693A
Publication Date:
September 15, 2004
Filing Date:
August 31, 1993
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G11B11/10; G11B11/105; G11B19/247; G11B19/28; (IPC1-7): G11B19/247; G11B11/105
Domestic Patent References:
| JP5182356A | ||||
| JP3141077A | ||||
| JP1302575A | ||||
| JP394664U |
Attorney, Agent or Firm:
Kenzo Hara