Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-11-14
1999-09-14
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369112, G11B 709
Patent
active
059532955
ABSTRACT:
Disclosed is a focusing error detecting equipment, which has a light-generating device; an image-forming device for converging light to be emitted from the light-generating means upon a focusing error detected object; a diffraction element for diffracting light to be reflected on the focusing error detected object; and a light-detecting device for receiving lights to be separated by the diffraction element; wherein the diffraction element is divided into four regions a, b, c and d by a boundary plane .alpha. and a boundary plane .beta., the regions a and c to be located diagonally diffracting the reflected light into lights with a convergence point before the light-detecting device and the regions b and d to be located diagonally diffracting the reflected light into lights with a convergence point behind the light-detecting device, the light-detecting device has light-receiving parts ea and eb which are divided by a division line e parallel with the boundary plane .alpha., light-receiving parts fa and fb which are divided by a division line f parallel with the boundary plane .alpha., light-receiving parts ga and gb which are divided by a division line g parallel with the boundary plane .alpha. and light-receiving parts ha and hb which are divided by a division line ha parallel with the boundary plane .alpha..
REFERENCES:
patent: 5570333 (1996-10-01), Katayama
patent: 5638352 (1997-06-01), Yang
patent: 5737296 (1998-04-01), Komma et al.
patent: 5757754 (1998-05-01), Yamamoto et al.
Tsuyoshi Nagano, et al., "Application of flip-chip bonding method to optical heads", pp. 103-109, Proceedings of 12th Meeting on Lightwave Sensing Technology, Japanese Society of Lightwave Sensing Technology, Japan Society of Applied Physics.
NEC Corporation
Tran Thang V.
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