Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2004-08-26
2010-02-23
Klimowicz, William J (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S116000, C369S053190
Reexamination Certificate
active
07668056
ABSTRACT:
A warpage angle measurement apparatus and a warpage angle measurement method are provided that can measure an angle of warpage of an optical disc and a cartridge for the optical disc caused by a rapid environmental change such as a temperature change or a humidity change in a short time. The warpage angle measurement apparatus10includes: a constant temperature chamber22for accommodating an optical recording medium20formed by mounting the optical disc16as an object to be measured in the cartridge18and for adjusting a surrounding of the optical recording medium20to have a predetermined environmental condition; a laser oscillator24for causing laser oscillation to emit laser light to the optical disc16; and a light-receiving unit26for receiving the laser light reflected from the optical disc16and detecting a relative angle of an optical path L2of the reflected laser light with respect to an optical path L1of the emitted laser light.
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Komaki Tsuyoshi
Yamada Takashi
Chu Kim-Kwok
Klimowicz William J
Oliff & Berridg,e PLC
TDK Corporation
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