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AssigneesHitachi, Ltd., Hitachi-LG Data Storage, Inc.
InventorsAkihiro Asada, Masaaki Kurebayashi
Estimating the term…
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.
An optical disk drive for recording information by forming marks or spaces on an optical disk, comprising:
An optical disk drive for recording information by forming marks and spaces on an optical disk, wherein the marks and spaces are formed by superimposing a high-frequency component on one of a mark forming semiconductor laser drive current and a space forming semiconductor laser drive current, the mark forming semiconductor laser drive current having a drive waveform corresponding to a mark length and one or more levels of current value, the space forming semiconductor laser drive current having one level of current value;
An optical disk recording method for recording an optical disk by radiating a laser light from a laser diode onto the optical disk, the method comprising:
An optical disk recording method for recording an optical disk by radiating a laser light from a laser diode onto the optical disk, the method comprising:
Dependencies are inferred from the claim text.