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公开(公告)号：US11295779B2
公开(公告)日：2022-04-05
申请号：US17281686
申请日：2019-11-08
发明人： Kohei Nakata , Yasushi Kobayashi
IPC分类号： G11B7/0045 , G11B20/10 , G11B20/12 , G11B20/18
摘要： The present disclosure provides an optical disk device capable of reproducing data recorded on a high linear density optical disk stably. The optical disk device according to the disclosure is characterized by being equipped with a recording expected waveform generation circuit which generates, at the time of recording, an expected waveform that is expected to be obtained at the time of decoding; and a recording pulse generation circuit which generates a recording pulse for driving a laser with power and a time width suitable for an amplitude value of the recording expected waveform for each sampling point of the recording expected waveform.
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公开(公告)号：US09911449B2
公开(公告)日：2018-03-06
申请号：US15377044
申请日：2016-12-13
发明人： Kazuo Momoo , Junichi Asada , Yasushi Kobayashi , Kousei Sano , Yuichi Takahashi
CPC分类号： G11B7/0901 , G11B7/094 , G11B7/0943 , G11B7/131 , G11B7/133
摘要： The first, third, fourth, and seventh photosensors are disposed on one side with respect to the centerline, and the second, fifth, sixth, and eighth photosensors are disposed on another side with respect to the centerline. The first and seventh photosensors are positioned between the third and fourth photosensors in the direction parallel to the centerline. The second and eighth photosensors are positioned between the fifth and sixth photosensors in the direction parallel to the centerline. The first photosensor receives overlapped light of the 0th-order light with the +1st-order diffracted light, the second photosensor receives overlapped light of the 0th-order light with the −1st-order diffracted light, each of the third to sixth photosensors receives the 0th-order light, and does not receive the +1st-order diffracted light and the −1st-order diffracted light, and each of the seventh and eighth photosensors receives at least the 0th-order light.
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公开(公告)号：US11475918B2
公开(公告)日：2022-10-18
申请号：US17487303
申请日：2021-09-28
发明人： Yasushi Kobayashi , Kohei Nakata , Yasumori Hino
IPC分类号： G11B27/24 , G11B20/10 , G11B7/0045
摘要： A recording mark is formed on a recording medium by a predetermined recording signal, a playback signal of the recording mark formed on the recording medium is obtained, and an expected value signal of the playback signal based on the recording signal is generated. Based on an amplitude error between the playback signal and the expected value signal, and for each predetermined unit of the recording signal, a deviation amount of a mark shape of the recording mark from which the playback signal is obtained with respect to a mark shape of an ideal recording mark is calculated, and a mark shape of the recording mark formed on the recording medium is estimated. Based on the deviation amount of the mark shape of the recording mark, a correction amount is calculated for each predetermined unit of the recording signal, and a level of the recording signal is adjusted.
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公开(公告)号：US11475917B2
公开(公告)日：2022-10-18
申请号：US16963575
申请日：2019-10-23
IPC分类号： G11B7/139 , G11B7/1374 , G02B13/18 , G11B7/0045
摘要： Provided is an objective lens which is used so that more information can be accumulated in a large-capacity optical disk and which has a further enhanced numerical aperture NA. The objective lens is a single lens having the numerical aperture NA and a refractive index n, and is configured so as to satisfy: NA≥0.91 and 1.61≤n
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公开(公告)号：US11430479B2
公开(公告)日：2022-08-30
申请号：US16963575
申请日：2019-10-23
IPC分类号： G11B7/139 , G11B7/1374 , G02B13/18 , G11B7/0045
摘要： Provided is an objective lens which is used so that more information can be accumulated in a large-capacity optical disk and which has a further enhanced numerical aperture NA. The objective lens is a single lens having the numerical aperture NA and a refractive index n, and is configured so as to satisfy: NA≥0.91 and 1.61≤n
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