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Optical disc apparatus   

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Abstract: An optical disk apparatus having a high reliability by evading collision between a condensing lens and an optical disk regardless whether the focus control is in the operative state or in the inoperative state, thereby preventing damage to the condensing lens and the optical disk. When the focus control is in the inoperative state, by using a reflection light amount from the optical disk (1), it is ascertained that the focus of the light beam is in the vicinity of the information surface and the condensing lens (15) is driven to be apart from the optical disk (1). ...

Agent: Hamre, Schumann, Mueller & Larson P.C. - Minneapolis, MN, US
Inventors: Kenji Fujiune, Yuuichi Kuze, Shin-ichi Yamada, Katsuya Watanabe
USPTO Applicaton #: #20070258337 - Class: 369044110 (USPTO) - 11/08/07 - Class 369 

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Related Patent Categories: Dynamic Information Storage Or Retrieval, With Servo Positioning Of Transducer Assembly Over Track Combined With Information Signal Processing, Optical Servo System
The Patent Description & Claims data below is from USPTO Patent Application 20070258337, Optical disc apparatus.

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