发明名称 |
Information reading system with controlled optical access |
摘要 |
There is provided an improved information reading system, comprising: an objective lens for converging a reading beam on an information recording medium so as to form an information detecting point; an actuator for controlling the position of the information detecting point by driving the objective lens; a tracking error signal generator for generating a tracking error signal; a least one light detecting/receiving means having at least two light detecting/receiving sections for detecting and receiving light reflected from the information recording medium; a least one calculator connected with the at least one light detecting/receiving means for producing a difference signal indicating a difference between two light receiving amounts on the two detecting/receiving sections; a low frequency signal detecting/passing means for detecting and passing low frequency signals which are low frequency components contained in the difference signal; an adder for adding together the low frequency signals fed from the low frequency signal detecting/passing means and the tracking error signal; and a driver for driving the actuator in accordance with an output signal fed from the adder.
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申请公布号 |
US5812505(A) |
申请公布日期 |
1998.09.22 |
申请号 |
US19960754802 |
申请日期 |
1996.11.21 |
申请人 |
PIONEER ELECTRONIC CORPORATION |
发明人 |
SHIMODA, YASUHISA;KURASHINA, HIROYUKI |
分类号 |
G11B7/09;G11B19/12;(IPC1-7):G11B7/08 |
主分类号 |
G11B7/09 |
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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