Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal processing for controlling recording light...
Reexamination Certificate
2007-10-26
2009-08-04
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal processing for controlling recording light...
C369S047510, C369S116000
Reexamination Certificate
active
07570565
ABSTRACT:
An optical disk drive includes drive current generation unit for supplying a mark forming semiconductor laser drive current and a space forming semiconductor laser drive current; first high-frequency superimposition unit for superimposing a high-frequency component on the space forming semiconductor laser drive current; and high-frequency superimposition control unit for controlling the first high-frequency superimposition unit to stop the superimposition of the high-frequency component for a predetermined duration prior to a timing at which to switch from the space forming semiconductor laser drive current to the mark forming semiconductor laser drive current, eliminating positional variations on the disk of the mark leading and trailing edges due to the high frequency superimposition.
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U.S. Office Action issued in U.S. Appl. No. 11/976,673, dated Dec. 15, 2008.
Asada Akihiro
Kurebayashi Masaaki
Bibbins LaTanya
Hitachi , Ltd.
Hitachi-LG Data Storage, Inc.
McDermott Will & Emery LLP
Young Wayne R
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