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AssigneeHitachi, Ltd.
InventorsAkemi Hirotsune, Harukazu Miyamoto, Takeshi Maeda
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A method of recording information by irradiating a recording track in an information recording medium with light, the information recording medium comprising a plurality of layers for the recording of information by light irradiation. Each of the layers comprises asperities made up of a groove, the groove in each of the multiple layers having wobbles of a first frequency and wobbles of a second frequency that is different from the first frequency within a single track, wherein the first frequency is constant in each of the layers, and wherein a different signal is obtained from the wobbles of the first and second frequencies in each of the plurality of layers.
A method of recording information by irradiating a recording track in an information recording medium with light, the information recording medium comprising multiple of layers for the recording of information by light irradiation, wherein each of the layers comprises asperities made up of a groove, the groove in each of the multiple layers having wobbles of a first frequency and wobbles of a second frequency that is different from the first frequency within a single track, wherein the first frequency is constant in each of said layers, and wherein a different signal is obtained from the wobbles of the first and second frequencies in each of the plurality of layers, the method comprising the step of irradiating the information recording medium with light for recording information thereon.
A method of reproducing information by irradiating a recording track in an information recording medium with light, the information recording medium comprising multiple layers for the reproduction of information by light irradiation, wherein each of the multiple layers comprises asperities made up of a groove, the groove in each of the multiple layers having wobbles of a first frequency and wobbles of a second frequency that is different from said first frequency within a single track, wherein the first frequency is constant in each of the multiple layers, and wherein a different signal is obtained from the wobbles of said first and second frequencies in each of the multiple layers, the method comprising the step of reproducing information from the information recording medium in response to irradiation of the information recording medium with light.
An information recording apparatus for recording information by irradiating a recording track of an information recording medium with light, the information recording medium comprising multiple layers for the recording of information by optical irradiation, wherein each of the multiple layers comprises asperities made up of a groove, the groove in each of the multiple layers having wobbles of a first frequency and wobbles of a second frequency that is different from the first frequency within a single track, wherein the first frequency is constant in each of said layers, and wherein a different signal is obtained from the wobbles of the first and second frequencies in each of the multiple layers, the information recording apparatus comprising:
An information reproducing apparatus for reproducing information by irradiating a recording track of an information recording medium with light, the information recording medium comprising multiple layers for the recording of information by optical irradiation, wherein each of the multiple layers comprises asperities made up of a groove, the groove in each of the multiple layers having wobbles of a first frequency and wobbles of a second frequency that is different from said first frequency within a single track, wherein the first frequency is constant in each of the multiple layers, and wherein a different signal is obtained from the wobbles of the first and second frequencies in each of the multiple layers, the information reproducing apparatus comprising:
Dependencies are inferred from the claim text.