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1.发明授权公开(公告)号：US10650856B1
公开(公告)日：2020-05-12
申请号：US16367224
申请日：2019-03-27
发明人： Ryo Hosoi , Seiichi Takayama
摘要： A thermally assisted magnetic head including a slider and a light source-unit. The slider includes a slider substrate and a magnetic head part. The light source-unit includes a laser diode and a sub-mount. The magnetic head part includes a medium-opposing surface, a light source-opposing surface and a waveguide which guides laser light from the light source-opposing surface to the medium-opposing surface. The thermally assisted magnetic head includes an optimal-structure which the following optimizing conditional expression, concerning an inlet-optical path length L1 of an inlet-interval of the waveguide, and an outlet-optical path length L2 of an outlet-interval, is satisfied, m1×L1=L2 (m1 is a natural number).
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公开(公告)号：US11626133B1
公开(公告)日：2023-04-11
申请号：US17709402
申请日：2022-03-30
发明人： Ka Yip Wong , Chi Hung Yuen , Ryo Hosoi , Seiichi Takayama
摘要： A method of manufacturing a head gimbal assembly includes a head connecting step which a thermally assisted magnetic head is connected to a suspension. The head connecting step includes a solder ball arrangement step which a solder ball is arranged so that a laser diode of the thermally assisted magnetic head is connected to a flexure of the suspension, in an assembly structure which a slider of the thermally assisted magnetic head is adhered to the suspension. The solder ball arrangement step is performed using a connecting ball, as the solder ball, having a size smaller than a wiring gap between an electrode surface of the laser diode and the flexure, and being in melted-particle condition.
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3.发明授权公开(公告)号：US10510371B1
公开(公告)日：2019-12-17
申请号：US16282383
申请日：2019-02-22
发明人： Ryo Hosoi , Takashi Honda , Seiichi Takayama
IPC分类号： G11B11/105 , G11B13/08 , G11B5/00 , G11B5/31 , G11B5/60
摘要： A light source-unit comprises a laser diode, a sub-mount which the laser diode is joined, and a heater which is joined on a joint surface of the sub-mount. The sub-mount comprises a pair of barrier-members. The barrier-members are formed with lower thermal conductivity material which thermal conductivity is lower than joining metal which is used for joining the laser diode and the sub-mount. The barrier-members are formed on the joint surface so as to sandwich the heater.
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公开(公告)号：US11887638B1
公开(公告)日：2024-01-30
申请号：US17980771
申请日：2022-11-04
发明人： Ryo Hosoi , Seiichi Takayama , Kang Gao , Yasuhiro Konakawa , Yasutoshi Fujita , Ryuji Fujii
CPC分类号： G11B7/127 , G11B2005/0021
摘要： The laser diode includes an electrode pad layer, being connected to an electrode, and an outer surface in which the electrode pad layer is formed. The electrode pad layer includes a solder-bonding pad part and a solder-contact preventing part. The solder-contact preventing part is formed with small wettability material having solder wettability which is smaller than solder wettability of the solder-bonding pad part. The solder-bonding pad part and the solder-contact preventing part are formed so that a pad height, being a height from the outer surface to a surface of the solder-bonding pad part, is larger than a preventing height, being a height from the outer surface to a surface of the solder-contact preventing part.
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5.发明授权公开(公告)号：US11127424B1
公开(公告)日：2021-09-21
申请号：US16950885
申请日：2020-11-17
发明人： Kang Gao , Seiichi Takayama , Ryo Hosoi , Ryuji Fujii
摘要： A light source-unit includes a laser diode, a sub-mount which the laser diode is joined. The laser diode includes an optical generating layer including an active layer which emits laser-light and cladding layers being formed so as to sandwich the active layer. The active layer includes a quantum dot layer including a plurality of quantum dots, which respectively confine movements of carriers in the three-dimensional directions.
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公开(公告)号：US10311903B2
公开(公告)日：2019-06-04
申请号：US15649961
申请日：2017-07-14
发明人： Seiichi Takayama , Takashi Honda , Ryuji Fujii , Ryo Hosoi , Kaichiu Cheung , Tsutomu Sasaki , Jingtao Lu , Fanglong Nie
摘要： A method of testing dynamic performances for a slider body of a thermally-assisted magnetic head includes: providing a slider body which is disconnected with a light source unit; removably mounting the slider body to a test head suspension assembly; keeping to provide a flat top beam to the slider body, the flat top beam being aligned with the optical waveguide, and a projection of an incident end of the optical waveguide being located within a light spot of the flat top beam; and testing the dynamic performance of the slider body. It can save the material cost and labor cost, and eliminate a precise optical alignment between an input light and an optical waveguide in the slider body to improve testing efficiency.
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公开(公告)号：US11817678B2
公开(公告)日：2023-11-14
申请号：US17211818
申请日：2021-03-25
发明人： Seiichi Takayama , Kang Gao , Ryo Hosoi , Ryuji Fujii
IPC分类号： H01S5/34 , G01S17/931 , H01L33/06 , H01S5/042
CPC分类号： H01S5/3412 , G01S17/931 , H01L33/06 , H01S5/04254
摘要： A semiconductor laser includes an active layer which emits laser light and cladding layers being formed so as to sandwich the active layer. The active layer includes a quantum dot layer including a plurality of quantum dots, which respectively confine movements of carriers in the three-dimensional directions. The laser radar device includes a light projection part which projects laser light and a light receiving part which receives reflected light of the laser light. The light projection part includes the semiconductor laser and a scanner which reflects the laser light, emitted from the semiconductor laser, to form a scanning laser light.
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公开(公告)号：US11763842B1
公开(公告)日：2023-09-19
申请号：US17743435
申请日：2022-05-12
发明人： Ka Yip Wong , Chi Hung Yuen , Ryo Hosoi , Seiichi Takayama
CPC分类号： G11B5/4826 , G11B2005/0021
摘要： A method of manufacturing a head gimbal assembly includes a head connecting step which a thermally assisted magnetic head is connected to a suspension. The head connecting step includes a solder ball arrangement step which only one solder ball is arranged so that a laser diode of the thermally assisted magnetic head is connected to a flexure of the suspension, in an assembly structure which a slider of the thermally assisted magnetic head is adhered to the suspension. The solder ball arrangement step is performed using a connecting ball, as the solder ball, having a size larger than a wiring gap between an electrode surface of the laser diode and the flexure, and being in unmelted-solid condition.
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公开(公告)号：US11749302B1
公开(公告)日：2023-09-05
申请号：US17743443
申请日：2022-05-12
发明人： Ka Yip Wong , Chi Hung Yuen , Ryo Hosoi , Seiichi Takayama
CPC分类号： G11B5/4826 , G11B5/484 , G11B2005/0021
摘要： A method of manufacturing a head gimbal assembly includes a head connecting step which a thermally assisted magnetic head is connected to a suspension. The head connecting step includes a solder ball arrangement step which only one solder ball is arranged so that a laser diode of the thermally assisted magnetic head is connected with a flexure of the suspension, in an assembly structure which a slider of the thermally assisted magnetic head is adhered to the suspension. The solder ball arrangement step is performed using a connecting ball, as the solder ball, having a size larger than a wiring gap and being in unmelted-solid condition. The head connecting step includes a heat step which an electrode surface of the laser diode is heated.
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公开(公告)号：US20220311217A1
公开(公告)日：2022-09-29
申请号：US17211818
申请日：2021-03-25
发明人： Seiichi Takayama , Kang Gao , Ryo Hosoi , Ryuji Fujii
IPC分类号： H01S5/34 , H01S5/042 , H01L33/06 , G01S17/931
摘要： A semiconductor laser includes an active layer which emits laser light and cladding layers being formed so as to sandwich the active layer. The active layer includes a quantum dot layer including a plurality of quantum dots, which respectively confine movements of carriers in the three-dimensional directions. The laser radar device includes a light projection part which projects laser light and a light receiving part which receives reflected light of the laser light. The light projection part includes the semiconductor laser and a scanner which reflects the laser light, emitted from the semiconductor laser, to form a scanning laser light.
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