Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1999-03-19
2000-11-14
Hindi, Nabil
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369120, G11B 700
Patent
active
061479527
ABSTRACT:
An optical disk apparatus is capable of reproducing information from an optical disk 10. The optical disk apparatus mainly includes an illuminating unit which is formed from a semiconductor laser 14, a collimator lens 15, a polarization beam splitter (PBS) 16 and a -wavelength converter 17, as well as an objective lens 18, that focuses a light beam onto the optical disk 10; a two-segment split photo detector 21 which detects the light beam reflected by the optical disk 10; and a signal processing circuit 27 which processes a signal obtained by the two-segment split photo detector 21 to output a signal for reproduction. The two-segment split photo detector 21 has a divisional line 22 parallel to a line tangent to the track of the optical disk 10, and the line 22 is shifted away from the center line of the zero-order diffracted beam by a distance d in the direction of the disk radius, so that the light receiving surface of the photo detector 21 is divided into two areas or segments 23a and 23b by the divisional line 22. The signal processing circuit 27 is capable of processing the difference between and the sum of signal values detected in the detecting areas 22a and 22b, and it outputs the difference signal or sum signal as the playback signal of the optical desk 10.
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Hindi Nabil
Kabushiki Kaisha Toshiba
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