Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1987-12-11
1989-12-26
Faber, Alan
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 44, 369 58, 369106, G11B 709
Patent
active
048902730
ABSTRACT:
A focused light beam is projected upon an optical recording medium through an optical system in an optical pickup, and a light reflected from the recording medium is received to detect a focus error signal and a tracking error signal. Further, the focus control and the tracking control are both achieved through a servo feedback loop in response to the detected focus and tracking error signals. In this optical information recording and reproducing system, track formats are provided from which lights of different intensities are reflected, the track formats are discriminated by a projection position detecting circuit, and the focusing and tracking operations are controlled by selectively adjusting the gain of the servo feedback system according to the detected track format, so that the control operation is stable in recording or reproducing information data to or from a recording medium of a high density type, in particular.
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Ikeda Yoshiaki
Takeuchi Toyoaki
Faber Alan
Olympus Optical Co,. Ltd.
Young W. R.
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