Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-10-24
2006-10-24
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044340, C369S044410
Reexamination Certificate
active
07126889
ABSTRACT:
A circuit to improve the SN characteristic of a tracking error signal. This tracking error detection circuit is formed as a push-pull system utilizing a quadrant type photo-detector and provided with 4 gain control amplifiers20, 22, 24,and26,4 bottom envelope circuits28, 30, 32,and34,a pair of subtracting circuits36and38,adding (subtracting) circuit40,offset circuit42,and gain control circuit44.Bottom envelope circuits28, 30, 32,and34are configured with a capacitor-type peak-hold circuit, for example, whereby bottom envelopes of RF signals SA, SB, SC, and SD given from light receiving areas A, B, C, and D of a photo-detector via gain control amplifiers20, 22, 24,and26are detected, and bottom envelope signals SAbtm, SBbtm, SCbtm, and SDbtm representing the waveforms of the respective bottom envelopes are output.
REFERENCES:
patent: 4744069 (1988-05-01), Sugiyama et al.
patent: 5854781 (1998-12-01), Kurihara
patent: 6646961 (2003-11-01), Iida et al.
patent: 61-242347 (1986-10-01), None
Murata Hironobu
Takashi Aoe
Yamanoi Koyu
Brady W. James
Hindi Nabil
Hoel Carlton H.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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