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公开(公告)号：US20210327466A1
公开(公告)日：2021-10-21
申请号：US17360286
申请日：2021-06-28
Inventor： Yoshiaki KOMMA
IPC: G11B7/24067 , G11B7/258 , G11B7/24035 , G11B7/257 , G11B7/24062 , G11B7/1374 , G11B7/1376 , G11B7/1378
Abstract: Provided is a method of manufacturing an optical disk having at least a cover layer, a first information recording surface, a first intermediate layer, a second information recording surface, a second intermediate layer, and a third information recording surface in order from a surface irradiated with a light beam on at least one side, wherein a numerical aperture of an objective lens that converges the light beam on any of the recording surface of the optical disk when information recording or information reproduction of the optical disk is performed is 0.91, standard value dk of each thickness from the surface to the first to third information recording surfaces is set on the premise of standard refractive index no, where k is 1, 2, 3, and a target value of each actual thickness from the surface to the first to third information recording surfaces is determined by a product of conversion coefficient g(n) depending on refractive index n from the first to third information recording surfaces, and standard value dk.
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公开(公告)号：US20210311291A1
公开(公告)日：2021-10-07
申请号：US17346813
申请日：2021-06-14
Inventor： Yoshiaki KOMMA , Yuichi TAKAHASHI
IPC: G02B19/00
Abstract: This objective lens has a single lens that has a numerical aperture of 0.85 or more. A base material thickness th and a base material thickness tm differ from each other. The base material thickness th is a thickness where third-order spherical aberration is minimized when a light beam that is substantially parallel is input to the objective lens, and the base material thickness tm is a thickness where total aberration is minimized when third-order spherical aberration is minimized by changing parallelism of the light beam input to the objective lens from a parallel state.
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Patent Agency Ranking
公开(公告)号：US20210304793A1
公开(公告)日：2021-09-30
申请号：US16963575
申请日：2019-10-23
Inventor： Yoshiaki KOMMA , Yasushi KOBAYASHI , Kazuhiro MINAMI
IPC: G11B7/1374 , G11B7/0045 , G02B13/18
Abstract: 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：US20160284375A1
公开(公告)日：2016-09-29
申请号：US15049424
申请日：2016-02-22
Inventor： Kousei SANO , Yoshiaki KOMMA , Fumitomo YAMASAKI , Kanji WAKABAYASHI
IPC: G11B7/1374 , G11B7/1395 , G11B7/1353 , G11B7/09 , G11B7/13
CPC classification number: G11B7/1353 , G11B7/0901 , G11B7/0904 , G11B7/0943 , G11B7/131
Abstract: A recording device of the present disclosure includes a light source, an objective lens, a beam splitter, an optical element, a detector and an operation circuit. The optical element divides a light beam into a first main region, a second main region, a first main end region, a second main end region, a first sub-region, and a second sub-region. The operation circuit generates a main signal in which a first main end region signal is multiplied by a coefficient a and added to the first main region signal, and a second main signal in which a second main end region signal is multiplied by the coefficient α and added to the second main region signal.
Abstract translation: 本公开的记录装置包括光源，物镜，分束器，光学元件，检测器和操作电路。 光学元件将光束分为第一主区域，第二主区域，第一主端区域，第二主端区域，第一子区域和第二子区域。 运算电路产生主信号，其中第一主端区域信号乘以系数α并相加于第一主区域信号;以及第二主信号，其中第二主端区域信号乘以系数α和 添加到第二主区域信号。
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公开(公告)号：US20210327465A1
公开(公告)日：2021-10-21
申请号：US17360256
申请日：2021-06-28
Inventor： Tsuyoshi NAKASENDO , Yoshiaki KOMMA
IPC: G11B7/1374 , G11B7/127 , G11B7/09
Abstract: An optical disk reproducing device includes a division element that divides a reflected light reflected and diffracted by an optical disk into a light flux in a central region and light fluxes in end regions; a photodetector that has a central light receiver that receives the light flux in the central region and at least two end light receivers that receive the light fluxes in the end regions, and outputs a light amount signal corresponding to a light amount of each of the received light fluxes; a non-linear processor that receives each of the light amount signals from the central light receiver and the end light receivers, and outputs linear signals and non-linear signals obtained by processing the light amount signals by linear and non-linear arithmetic operations; an equalization processor that receives the linear signals and the non-linear signals and outputs signals each amplified with a predetermined gain; an adder that adds the amplified signals and outputs an equalization signal; a reproduction signal processor that processes the equalization signal and outputs a reproduction signal and an equalization error signal; and a gain controller that receives the equalization error signal and controls an amplification gain of the non-linear signals.
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公开(公告)号：US20160104505A1
公开(公告)日：2016-04-14
申请号：US14971326
申请日：2015-12-16
Inventor： Fumitomo YAMASAKI , Kousei SANO , Yoshiaki KOMMA , Kanji WAKABAYASHI , Toshiyasu TANAKA
IPC: G11B7/1353 , G11B7/1395
CPC classification number: G11B7/1353 , G11B7/005 , G11B7/131 , G11B7/1395 , G11B20/10009 , G11B20/10046 , G11B2007/0013
Abstract: An RF hologram is divided in a direction perpendicular to a tangent line of an information track of an information recording surface of an optical disc, and includes a central region including an optical axis of laser light as well as a first end portion region and a second end portion region which sandwich the central region, the central region is formed by a binary diffraction grating and generates ±1 order diffracted light, the first end portion region is formed by a blazed diffraction grating and generates first +1 order diffracted light, the second end portion region is formed by a blazed diffraction grating and generates second +1 order diffracted light, and an RF light receiving element receives both the ±1 order diffracted light, the first +1 order diffracted light, and the second +1 order diffracted light.
Abstract translation: RF全息图在与光盘的信息记录表面的信息轨道的切线垂直的方向上分割，并且包括包括激光的光轴的中心区域以及第一端部区域，以及第二 夹着中心区域的端部区域，中央区域由二元衍射光栅形成，产生±1级衍射光，第一端部区域由闪耀的衍射光栅形成，产生第一+1级衍射光，第二 端部区域由闪耀的衍射光栅形成，并产生第二+1级衍射光，RF光接收元件接收±1级衍射光，第一+1级衍射光和第二+1级衍射光 。
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公开(公告)号：US20150380041A1
公开(公告)日：2015-12-31
申请号：US14848882
申请日：2015-09-09
Inventor： Kanji WAKABAYASHI , Kousei SANO , Fumitomo YAMASAKI , Yoshiaki KOMMA , Toshiyasu TANAKA
IPC: G11B7/1374 , G11B20/10 , G11B7/1353
CPC classification number: G11B7/1374 , G11B7/0037 , G11B7/005 , G11B7/00718 , G11B7/1353 , G11B7/1381 , G11B7/1395 , G11B7/24073 , G11B20/10027 , G11B2007/00709
Abstract: An optical disc information device is an optical disc information device for reproducing and/or recording information with respect to an optical disc including a track in the form of a groove, and capable of recording information in a land portion and in a groove portion of the groove. The optical disc information device includes a laser light source, an objective lens, a transmittance limiting element, a dividing element, a light detector, a central amplifier, at least two end amplifiers, a gain controller, an adder, a reproduction signal processor, and a control signal processor. The transmittance limiting element includes a first central region, and at least two first end regions which interpose the first central region therebetween, and attenuates light passing through at least the first end regions out of a light flux emitted from the laser light source more strongly than light passing through the first central region.
Abstract translation: 光盘信息设备是用于再现和/或记录关于包括凹槽形式的轨道的光盘的信息的光盘信息设备，并且能够将信息记录在接地部分和凹槽部分的槽部分中 槽。 光盘信息装置包括激光源，物镜，透光率限制元件，分割元件，光检测器，中央放大器，至少两个末端放大器，增益控制器，加法器，再现信号处理器， 和控制信号处理器。 透光率限制元件包括第一中心区域和至少两个第一端部区域，其中插入第一中心区域，并且使从激光光源发射的光束中至少穿过至少第一端部区域的光更强烈地比通过 光穿过第一个中心区域。
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