Optical recording track access driving apparatus

Details Optical recording track access driving apparatus Optical recording track access driving apparatus

1992-07-28

1994-08-02

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4429, 369 4435, G11B 709

Patent

active

053352149

ABSTRACT:
An optical recording medium driving apparatus has the first high-pass filter for outputting a low frequency component removed signal by removing a low frequency component from a reproduction signal varying depending on a reflected light beam from the optical recording medium. The low frequency component removed signal changes due to transient response just after an access operation starts. Zero voltage is inputted to the second high-pass filter during a tracking operation while a voltage having a negative polarity which is substantially the same amplitude as the AC component of the low frequency component removed signal is inputted to the second high-pass filter. The first high-pass filter has the same time constant as the second high-pass filter. Just after the access operation starts, the negative voltage has the same transient response as the output of the first high-pass filter. The output of the first high-pass filter is compared to the output of the second high-pass filter in order to have a binary signal of the binary logic condition. A land is discriminated from a groove according to the binary signal, thereby enabling to access a target track in accuracy.

REFERENCES:
patent: 4730294 (1988-03-01), Funada
patent: 4974220 (1990-11-01), Harada
patent: 5051972 (1991-09-01), Yamamuro

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