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AssigneeSony Semiconductor Solutions Corporation
InventorsKoji Sekiguchi, Toshihiro Horigome, Kenji Yamamoto, Kotaro Kurokawa
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A reproduction apparatus dividing a cross section of superposed light into a plurality of regions in a tangential and/or radial direction includes: an optical system configured to generate each of a first set of signal light and reference light having a phase difference of approximately 0°, a second set of signal light and reference light having a phase difference of approximately 180°, a third set of signal light and reference light having a phase difference of approximately 90°, and a fourth set of signal light and reference light having a phase difference of approximately 270°, using a plurality of superposed light beams corresponding to the divided regions; an optical receiver configured to output signals corresponding to the sets of the signal light and the reference light; and a circuit configured to compute signals as differences between the signals, and obtain a reproduction signal by computation from the computed signals.
A reproduction apparatus that irradiates a recording medium having both a land and a groove to which a signal is recorded with light emitted from a light source to obtain a signal light that contains recording signals of both the land and the groove and generate reference light from the light emitted from the light source, forms superposed light by superposing the signal light and the reference light, and divides a cross section of the superposed light into a plurality of regions in a tangential direction and/or in a radial direction using a light dividing element, the reproduction apparatus comprising:
A reproduction method comprising:
Dependencies are inferred from the claim text.