发明名称 |
Tracking control device of an optical pick-up |
摘要 |
A tracking control system for use in an optical pick-up of an optical disc recording and reproducing apparatus includes a pair of photoelectric elements for receiving light reflecting from an optical disk. A pair of light current outputs obtained from the photoelectric elements is processed to produce a differential signal. A low pass filter is provided as a phase delay compensation circuit for compensating the low frequency component of the differential signal. During a track jump mode, the differential signal is processed through the low pass filter whose output is added with a kick pulse to produce a drive signal for use in a tracking actuator. The input side of the low pass filter may be disconnected during a track jump mode, thereby causing the low pass filter to also serve as a holding circuit for holding the voltage of the differential signal immediately prior to track jump.
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申请公布号 |
US4835754(A) |
申请公布日期 |
1989.05.30 |
申请号 |
US19870123055 |
申请日期 |
1987.11.19 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
YAMAMOTO, KAZUTAKA;SHIGEMORI, TOSHIHIRO |
分类号 |
G11B7/085;G11B7/09;G11B21/08;G11B21/10 |
主分类号 |
G11B7/085 |
代理机构 |
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代理人 |
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地址 |
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