公开(公告)号：US5142173A

公开(公告)日：1992-08-25

申请号：US564313

申请日：1990-08-08

申请人： Daisuke Konno ,  Sachihiko Miwa ,  Shunichi Aiyoshizawa ,  Kazuyuki Kasahara ,  Yoshio Sato ,  Kazuto Hirokawa ,  Yumiko Noda

发明人： Daisuke Konno ,  Sachihiko Miwa ,  Shunichi Aiyoshizawa ,  Kazuyuki Kasahara ,  Yoshio Sato ,  Kazuto Hirokawa ,  Yumiko Noda

IPC分类号： F16C33/10 ,  F16C39/06 ,  G11B19/20

CPC分类号： F16C33/107 ,  F16C17/107 ,  F16C39/063 ,  G11B19/2018 ,  F16C2370/12

摘要： A bearing structure suitable for a spindle motor or the like, which enables such a motor to rotate with minimal vibrations. The bearing structure comprises a stator including a support shaft which is disposed on a base, and a rotor which is rotatably disposed around the support shaft. A radial hydrodynamic bearing and a thrust hydrodynamic bearing are disposed between the stator and the rotor. The stator has the support shaft, a thrust plate and a radial cylindrical member which is concentric with the support shaft. The thrust plate is secured to an end surface of the radial cylindrical member. The support shaft extends through the centers of the radial cylindrical member and the thrust plate. The rotor has a radial sleeve. The radial hydrodynamic bearing is formed from the inner peripheral surface of the radial sleeve and the outer peripheral surface of the radial cylindrical member, which face each other and either of which is formed with herringbone-shaped grooves for generating dynamic pressure. The thrust hydrodynamic bearing is formed from an end surface of the radial sleeve and a sliding surface of the thrust plate, which face each other and either of which is formed with spiral grooves for generating dynamic pressure. A rolling bearing may be added in order to minimize the starting torque in the bearing structure.

公开(公告)号：US4998033A

公开(公告)日：1991-03-05

申请号：US506183

申请日：1990-04-09

申请人： Yasushi Hisabe ,  Noriyuki Osada ,  Toshihiro Ohtani ,  Masahiko Kishi ,  Yoshio Sato ,  Daisuke Konno ,  Sachihiko Miwa ,  Toshiya Kanamori ,  Shunichi Aiyoshizawa ,  Kazuyuki Kasahara ,  Kazuto Hirokawa ,  Yumiko Noda

发明人： Yasushi Hisabe ,  Noriyuki Osada ,  Toshihiro Ohtani ,  Masahiko Kishi ,  Yoshio Sato ,  Daisuke Konno ,  Sachihiko Miwa ,  Toshiya Kanamori ,  Shunichi Aiyoshizawa ,  Kazuyuki Kasahara ,  Kazuto Hirokawa ,  Yumiko Noda

IPC分类号： G11B19/20 ,  H02K5/16

CPC分类号： F16C17/107 ,  F16C25/045 ,  F16C27/08 ,  G11B19/2009 ,  H02K5/1677 ,  F16C2206/40 ,  F16C2370/12 ,  F16C27/063

摘要： A spindle motor comprising a stator including a support shaft positioned on a base, a cap-shaped rotor rotatably and concentrically disposed around the support shaft, thrust and radial bearings disposed between the stator and the rotor, a stator coil secured to the stator, and a rotor magnet member secured to the rotor opposing the stator coil. The thrust and radial bearings are hydrodynamic bearings. A movable piece that constitutes a part of the thrust bearing is secured to the lower end of a cylindrical portion of the rotor and extended outwardly or inwardly from the cylindrical portion, or is disposed above the rotor. The stator coil is secured to the outer peripheral portion of the support shaft above or below the radial bearing. The rotor magnet member is securd to the inner peripheral surface or inner top surface of the rotor. Either a radial or axial gap is provided between the stator coil and the rotor magnet member.

公开(公告)号：US4755491A

公开(公告)日：1988-07-05

申请号：US12651

申请日：1987-02-09

申请人： Sachihiko Miwa

发明人： Sachihiko Miwa

IPC分类号： C04B35/581 ,  C04B35/58

CPC分类号： C04B35/581

摘要： A manufacturing method for an aluminum nitride sintered body comprises admixing an additive selected from calcium cyanamide, calcium cyanide, and mixtures thereof with aluminum nitride powder, forming the mixture into a formed body, and sintering the formed body in a non-oxidizing atmosphere. The resulting aluminum nitride sintered body has a high thermal conductivity.

摘要翻译： 氮化铝烧结体的制造方法包括将选自氰氨腈，氰化钙及其混合物的添加剂与氮化铝粉末混合，将其混合成型体，并在非氧化性气氛中烧结成形体。 所得的氮化铝烧结体具有高导热性。

公开(公告)号：US5224782A

公开(公告)日：1993-07-06

申请号：US852146

申请日：1992-04-30

申请人： Sachihiko Miwa ,  Manabu Toshimitsu ,  Kazuyuki Kasahara ,  Yoshikazu Suganuma ,  Yumiko Noda

发明人： Sachihiko Miwa ,  Manabu Toshimitsu ,  Kazuyuki Kasahara ,  Yoshikazu Suganuma ,  Yumiko Noda

IPC分类号： F16C33/04 ,  F16C33/10

CPC分类号： F16C33/107 ,  F16C17/107 ,  F16C33/043 ,  Y10S384/907

摘要： A hydrodynamic bearing for a spindle motor used in an environment of high degree of cleanness. A sliding surface of the hydrodynamic bearing is formed of a ceramic material with a surface roughness Ra not larger than 0.3 microns, and this sliding surface is coated thinly with at least one lubricant selected from among perfluoropolyethers having a functional group reactive with the ceramic material, thereby providing on the sliding surface a uniform thin film with a thickness in the range of from 20 to 100 angstrom and having protecting and lubricating functions. The lubricant is selected from among hydroxyl group-containing perfluoropolyethers, carboxyl group-containing perfluoropolyethers, and ester group-containing. The lubricant contains an antistatic agent.

公开(公告)号：US5089732A

公开(公告)日：1992-02-18

申请号：US556255

申请日：1990-07-19

申请人： Daisuke Konno ,  Sachihiko Miwa ,  Shunichi Aiyoshizawa ,  Kazuyuki Kasahara ,  Yoshio Sato ,  Kazuto Hirokawa

发明人： Daisuke Konno ,  Sachihiko Miwa ,  Shunichi Aiyoshizawa ,  Kazuyuki Kasahara ,  Yoshio Sato ,  Kazuto Hirokawa

IPC分类号： H02K29/00 ,  F16C33/10 ,  F16C39/06 ,  G11B19/20 ,  H02K5/16 ,  H02K21/22

CPC分类号： F16C33/107 ,  F16C17/107 ,  F16C25/045 ,  F16C39/063 ,  G11B19/2009 ,  H02K5/1677 ,  F16C2370/12

摘要： A spindle motor which is designed to rotate with minimal vibrations and hence is suitable for a hard disk driver. The spindle motor employs hydrodynamic bearings as radial and thrust bearings. A support shaft is formed in a cylindrical configuration with a center hole, and a rotor has a columnar portion which is inserted into the center hole in the support shaft. A thrust bearing collar is attached to the lower end of the rotor, and a thrust bearing member is secured to a base in opposing relation to the thrust bearing collar. A group of stator coils and a radial bearing member are disposed on either the inner peripheral surface of the center hole in the support shaft or the outer peripheral surface of the support shaft, and a group of rotor magnets and a radial bearing sleeve are disposed on either the outer peripheral surface of the columnar portion or the inner peripheral surface of the rotor in opposing relation to the stator coil group and the radial bearing member.