Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-05-22
1998-02-03
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 369 4423, G11B 709
Patent
active
057152195
ABSTRACT:
A displacement detecting device for optical head is disclosed which is capable of stably generating displacement detecting signals without being affected by fluctuation of wavelength of light emitted from a light source. The displacement detecting device is provided for use in an optical head which comprises a optical sensor for reading information recorded on an optical information recording medium by irradiating the optical information recording medium with light from a light source and detecting reflected light from the irradiated surface of the recording medium as well as detecting focus displacement and track displacement by utilizing diffracted light of the reflected light. The optical sensor is provided with wavelength fluctuation component detector for detecting wavelength fluctuation components in the reflected light. At least one of a focus displacement detecting signal and a track displacement detecting signal is compensated for based on a wavelength fluctuation detecting signal generated by the wavelength fluctuation component detector, thereby enabling the displacement detection to be stably performed without being affected by fluctuation of the wavelength of light emitted from a light source.
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Fukui Kenji
Okamoto Ricardo Musashi
Takeda Tadashi
Wada Hiroyuki
Nippon Steel Corporation
Tran Thang V.
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