Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2003-09-17
2008-12-09
Young, Wayne (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S044320, C369S053150, C369S044340, C369S116000
Reexamination Certificate
active
07463563
ABSTRACT:
The present invention provides a deficiency detecting apparatus that can accurately detect dusts and deficiencies on an optical disk even when an emitting power of a laser light source changes. The deficiency detecting apparatus is provided with a deficiency detecting section for detecting deficiencies or the like on an optical disk by reflected light, and a power adjusting section for adjusting an emitting power of a laser light source to be an optimum value. The deficiency detecting section can accurately detect the deficiencies on the optical disk even when the laser power changes by comparing a threshold value, which is determined in accordance with the adjustment result of the power adjusting section, with a value in accordance with the reflected light.
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Translation of JP Patent No. 61-145743.
Kishimoto Takashi
Ueda Eiji
Yamada Shin-ichi
Hamre Schumann Mueller & Larson P.C.
Matsushita Electric - Industrial Co., Ltd.
Nguyen Linh T
Young Wayne
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