Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-11-21
1998-09-22
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 4441, G11B 708
Patent
active
058125051
ABSTRACT:
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.
REFERENCES:
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 5138592 (1992-08-01), Fujita
patent: 5412630 (1995-05-01), Deguchi et al.
Kurashina Hiroyuki
Shimoda Yasuhisa
Pioneer Electronic Corporation
Tran Thang V.
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