Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2011-08-16
2011-08-16
Nguyen, Hoa T (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
Reexamination Certificate
active
08000182
ABSTRACT:
An integrated circuit for optical disc comprising for each of light-receiving surfaces: an operational amplifier including inverting and noninverting input terminals receiving first and second input voltages, and output terminal receiving output voltage; a feedback resistor connected between the inverting input and output terminals; a photodiode connected between one power supply line of the first and second power supply lines and the inverting input terminal to generate current corresponding to reflected light; a capacitor connected between the one power supply line and the noninverting input terminal; and an input resistor connected between reference power source and the noninverting input terminal, further comprising: an adder adding voltages corresponding to the output voltages to generate RF signal, capacitance of the capacitor and resistance value of the input resistor being determined in accordance with capacitance of parasitic capacitor connected in parallel with the photodiode and resistance value of the feedback resistor.
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Arai Masashi
Kawashima Takahiro
Frank Emily
Gunther John E.
Nguyen Hoa T
Sanyo Electric Co,. Ltd.
Sanyo Semiconductor Co. Ltd.
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