Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-01-30
2007-01-30
Edun, Muhammad (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044270, C369S044320, C369S044340
Reexamination Certificate
active
10776194
ABSTRACT:
It is an object of the present invention to provide an optical pickup astigmatism adjusting method capable of easily correcting an astigmatism even if the spot shape of a light beam converged on an optical disc is not a true circle. An optical pickup astigmatism adjusting system of the present invention finds an inter-focal distance L0between a focal position where a light beam is converged in RAD direction and another focal position where a light beam is converged in TAN direction, and a further inter-focal distance L45between a focal position where a light beam is converged in a direction inclined 45 degrees from RAD direction and another focal position where a light beam is converged in a direction inclined 45 degrees from TAN direction, thereby measuring an astigmatism in accordance with the inter-focal distances L0and L45. Then, an installation angle of a reflection mirror is adjusted in accordance with the inter-focal distances L0and L45, thus correcting the astigmatism.
REFERENCES:
patent: 5673241 (1997-09-01), Koyama et al.
patent: 6798723 (2004-09-01), Hayashi et al.
patent: 2002/0071365 (2002-06-01), Yanagawa
patent: 2002-015435 (2002-01-01), None
Ishii Ko
Kumamaru Yasushi
Kuwabara Yoshinari
Murakami Tetsuya
Ouchi Hidekazu
Edun Muhammad
Pioneer Corporation
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