Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1988-08-26
1991-02-05
McElheny, Jr., Donald
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
G11B 700
Patent
active
049911627
ABSTRACT:
A testing apparatus and method for an optical information memory medium such as an optical disk in an optical and noncontact manner, in which a laser light beam generated by a laser transducer is irradiated to an optical head or a reflecting mirror for tracking a groove of the optical information memory medium, and variations corresponding to mechanical characteristics such as a static deflection, a dynamic axial runout, an acceleration of axial runout, a dynamic radial runout, an acceleration of radial runout, an axial tilt angle, a circularity and the like, of the optical information memory are detected from the laser light beam reflected by the optical head or the reflecting mirror by a detector.
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Kabushiki Kaisha Toshiba
McElheny Jr. Donald
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