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US 2006/0187778 A1Published application
Optical pickup unit and information recording/reproduction apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsNobuaki Kaji, Sumitaka Maruyama, Akihito Ogawa, Kazuo Watabe
Life of this patent
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Abstract
According to one embodiment, an optical pickup unit which can record, reproduction and erase information in/from an information recording medium has tracks with different pitches, the dividing means has at least a part of a dividing boundary line placing between an end of a 1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle of the reflected laser beam.
Claims10
An optical pickup unit comprising:
- a condensing means for condensing a laser beam on the information recording surface of a recording medium;
- a dividing means for dividing a laser beam reflected from the information recording surface of the recording medium;
- and
- an optical detecting means for receiving the reflected laser beam divided by the dividing means,
- wherein when the information recording surface of the recording medium has tracks with different pitches, the dividing means has at least a part of a dividing boundary line placing between an end of a 1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle of the reflected laser beam.
2 more elements
An optical pickup unit comprising:
- a condensing means for condensing a laser beam on the information recording surface of a recording medium;
- a dividing means for dividing a laser beam reflected from the information recording surface of the recording medium;
- and
- an optical detecting means for receiving the reflected laser beam divided by the dividing means,
- wherein when the information recording surface of the recording medium has tracks with different pitches, the dividing means divides at least a part of a dividing boundary line in between an end of a +1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle, or between an end of a −1st order diffraction light with the maximum diffraction angle and an end of a −1st order diffraction light with the smallest diffraction angle of the reflected laser beam.
2 more elements
An information recording/reproduction apparatus comprising:
- a pickup having a condensing means for condensing a laser beam on an information recording surface of a recording medium, a dividing means for dividing a reflected laser beam reflected from the information recording of the recording medium, and an optical detecting means for receiving the reflected laser beam divided by the dividing means;
- a signal processing circuit for sending to the outside an air current guided in an air current path, which takes out information recorded on a recording medium from a reflected light from a recording medium detected by the optical detecting means, and
- a main control unit for controlling the operations of the optical pickup unit and signal processing circuit.
Dependencies are inferred from the claim text.