发明名称 |
Light spot position control system and method by sampled servo |
摘要 |
In a light spot position control system and method in which a control of the irradiation position of a light spot such as a focusing control, a jitter correction and/or a tracking control is made through a sampling control, a newly sampled error value is compared with a one-preceding sampled value. When a difference between both the values is within a range of a predetermined width, the newly sampled value is used as a new sample value as it is. When the difference exceeds the range of the predetermined width, a sum of the one-preceding sampled value and the predetermined width is used as a new sample value. Thereby, the influence of erroneous samples is reduced. |
申请公布号 |
US4872152(A) |
申请公布日期 |
1989.10.03 |
申请号 |
US19870131643 |
申请日期 |
1987.12.11 |
申请人 |
HITACHI, LTD. |
发明人 |
TSUYOSHI, TOSHIAKI;OHTAKE, MASATOSHI;TAKASUGI, WASAO;YONEZAWA, SEIJI |
分类号 |
G02B7/28;G11B7/09;G11B21/10 |
主分类号 |
G02B7/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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