Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2011-08-16
2011-08-16
Hindi, Nabil Z (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S047270, C369S047310
Reexamination Certificate
active
08000213
ABSTRACT:
There is provided an optical disc recording/reproducing apparatus which can reduce the chip size using the high-miniaturization process and can enhance the detection accuracy. A signal which is obtained by amplitude-adjusting a header region in a reproduced signal detected by an optical pickup (1) is digitized, and peak detection or bottom detection from the reproduced signal in each of a first section and a second section in the header region is performed by detection circuits (9) to (12), respectively. Then, amplitude data in the first section and the second section are obtained by subtracters (13) and (14) from the detected values in the respective detection circuits. A difference in amplitude between the first section and the second section in the header region is obtained by a subtracter (15) based on the amplitude data, and the amplitude difference is outputted as an off-track error signal. The respective detection circuits (9) to (12) perform detection operations in the first and second sections, and hold the detection operations in the sections other than the first and second sections.
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International Search Report issued Oct. 7, 2008 in counterpart International Application No. PCT/JP2008/001681.
Translation of the Written Opinion of the ISA (PCT/ISA/237) issued Oct. 7, 2008 in counterpart International Application No. PCT/JP2008/001681.
Ichiryu Dai
Sakai Mitsuru
Hindi Nabil Z
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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