Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2003-10-14
2009-06-23
Dinh, Tan X (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
Reexamination Certificate
active
07551537
ABSTRACT:
An optical recording medium master disc exposure apparatus comprises a modulating means3for modulating intensity of light from an exposure light source1in response to recording information and a focusing optical system9for focusing the light modulated by this modulating means3on a photoresist12on an optical recording medium master disc11to thereby pattern-expose the photoresist12in response to recording information. The exposure light source1is composed of a ultrashort wave pulse laser with a repetitive frequency of an integral multiple ranging from 1 time to 20 times as high as the clock frequency of recording information. This optical recording medium master disc apparatus includes an external synchronizing mechanism to vary the resonator length of this ultrashort wave pulse laser to mode-lock the repetitive frequency of the ultrashort wave pulse laser in synchronism with the clock frequency to cause the ultrashort wave pulse laser to emit pulses, and hence miniscule pits can be formed with high accuracy.
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Dinh Tan X
Sonnenschein Nath & Rosenthal LLP
Sony Corporation
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