公开(公告)号：JPS6188754A

公开(公告)日：1986-05-07

申请号：JP20786684

申请日：1984-10-03

Applicant: Sony Corp

Inventor： SAKAMOTO SATOSHI

IPC: H02K29/00 ,  H02K29/08

CPC classification number: H02K29/08

Abstract: PURPOSE:To reduce the torque ripple of a brushless motor, by providing auxiliary poles changing the magnetizing wave of a rotor magnet partly. CONSTITUTION:A rotor magnet M is magnetized in eight poles by a two phase and eight pole flat brushless motor, and the distance between coils LA, LB of A phase and B phase is organized by an electrical angle 90 deg. multiplied by an odd number. And Hall elements HA, HB detecting the rotary position of a rotor are positioned by an electrical angle 360 deg. multiplied by an integral number distant from the torque action side of each coil LA, LB because the current of the same phase as that of the intersecting flux is made to flow to the coils LA, LB of each phase. Then, the effective flux of main poles 1S, 1N of the magnet M is partly reduced, and so the auxiliary poles 2N, 2S are positioned at + or -45 deg. of the range of the main poles. The intersecting flux is attenuated due to the auxiliary poles 2N, 2S at the positions of 45 deg., 135 deg., 225 deg., 315 deg.... and the convex sections of torque wave are concaved, and the torque ripple can be reduced.

Abstract translation: 目的：为了减少无刷电机的转矩脉动，通过提供辅助极部分转换磁体的磁化波。 构成：转子磁体M通过两相和八极平面无刷电动机在八个磁极中被磁化，A相和B相的线圈LA，LB之间的距离由电角度90度组合。 乘以奇数。 并且检测转子的旋转位置的霍尔元件HA，HB定位在360度的电角度。 乘以距离每个线圈LA，LB的扭矩作用侧的整数，因为与相交磁通相同的相位的电流流向每相的线圈LA，LB。 然后，磁体M的主极1S，1N的有效磁通部分减少，辅助极2N，2S位于+或-45度。 的主极范围。 由于辅助极2N，2S在45度，135度，225度，315度的位置处，相交磁通衰减，转矩波的凸部凹陷，扭矩波动可以 减少

公开(公告)号：JPH11259893A

公开(公告)日：1999-09-24

申请号：JP15965498

申请日：1998-06-08

Applicant: SONY CORP

Inventor： UEDA MITSUNORI ,  KUBO TAKESHI ,  SUZUKI JUNICHI ,  SAKAMOTO SATOSHI ,  KAWAMURA HIROSHI ,  HINENO SATORU

IPC: G11B7/1376 ,  G11B7/125 ,  G11B7/135 ,  G11B7/1374 ,  G11B7/1392 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To increase the recording density and capacity of an optical disk by reducing the quantity of a spherical aberration even when the numerical aperture of an objective mounted on the optical head is large. SOLUTION: An optical head 1 is used for recording and reproduction an optical disk 2 having a light transmission layer 4 formed on a recording layer and is provided with an actuator 14 for a collimator lens. This actuator 14 moves the collimator lens 13 arranged between a light source 10 and the objective 16 so as to cancel spherical aberration due to errors in the thickness of the light transmission layer 4.

公开(公告)号：JPH10124897A

公开(公告)日：1998-05-15

申请号：JP29735396

申请日：1996-10-18

Applicant: SONY CORP

Inventor： MORO SHUJI ,  SAKAMOTO SATOSHI

IPC: G11B7/09

Abstract: PROBLEM TO BE SOLVED: To provide a biaxial actuator and an optical disk device making a movable part small in size and light in weight and having a reduced cost. SOLUTION: This device is provided with a lens holder 33 supported along a supporting shaft 32 capable of sliding and rocking about the supporting shaft and holding an objective lens 34, a focusing magnet part 33c and a tracking magnet 33d provided on the lens holder and a focusing coil 37 and a tracking coil 38 fixedly arranged so as to confront the focusing magnet part and the tracking magnet, respectively, and the focusing magnet part and the tracking magnet part are integrally composed as a part of the lens holder.

公开(公告)号：JPH09115085A

公开(公告)日：1997-05-02

申请号：JP29372295

申请日：1995-10-16

Applicant: SONY CORP

Inventor： MORO SHUJI ,  SAKAMOTO SATOSHI ,  NISHIDA YASUO ,  OSHIMA EIJI

IPC: G08C23/04

Abstract: PROBLEM TO BE SOLVED: To eliminate the need for an external motor, reduce the mechanical play of a turntable relative to a load when the turntable is rotated, and to surely transmit signal data regarding a signal source by transmitting and receiving the signal data reagarding the signal source between a base and the turntale in a non-contact state and processing the data. SOLUTION: When electric power is supplied to the stator coil 23b of a motor 23, variation of magnetic flux produced by the stator coil 23b and the magnetic flux of the rotor magnet 23 operate on each other and the turntable 12 rotates on the base 12. Consequently, the angle of rotation of the turntable 12 on the base NO is not limited specially and the turntable 12 can freely rotate. In this case, the signal data regarding the signal source (e.g. video camera) M are transmitted and received as light signal data between the base 10 and turntable 12 in a non-contact state and processed. Therefore, the signal data can securely be sent and received between the base 10 and turntable 12 even if the signal data are digital data, not to mention analog data.

公开(公告)号：JPH08234092A

公开(公告)日：1996-09-13

申请号：JP3738795

申请日：1995-02-24

Applicant: SONY CORP

Inventor： MORO SHUJI ,  SAKAMOTO SATOSHI

IPC: G03B3/10 ,  G02B7/04 ,  G02B7/08 ,  G02B7/28 ,  G03B13/34 ,  H04N5/232

Abstract: PURPOSE: To make an electromagnetic driving device for driving a driven body light in weight and small in size. CONSTITUTION: A fixed part 8 is constituted of a yoke 17 with an outer yoke barrel part 20 and an inner yoke barrel part 21 formed through a connection part 19 in a lens barrel 2, supporting shafts 16A and 16B and a coil 18 wound around the circumferencial surface of one yoke barrel part of both yoke barrel parts. A driven body holding member 25 is inserted in between the outer yoke barrel part 20 and the inner yoke barrel part 21 after providing a through-space part 30 with the inner yoke barrel part 21 pierced and bearing part 31 and 32 supported by the supporting shafts 16A and 16B; and a movable part 9 is constituted of the driven body holding member 25 and the driven body 24 held by the driven body holding member 25. The fixed part 8 is combined with the movable part 9 so that it may be movably supported by the supporting shafts 16A and 16B along the yoke 17 constituting the fixed part 8, and also, the driven body holding member 25 is formed of magnetic material.

公开(公告)号：JPH085400A

公开(公告)日：1996-01-12

申请号：JP15910994

申请日：1994-06-17

Applicant: SONY CORP

Inventor： SAKAMOTO SATOSHI ,  NAKAYAMA AKIHITO

IPC: G01D5/245 ,  G01D5/14 ,  G01D5/16 ,  G01P3/487 ,  G01R33/09 ,  H01L43/08

Abstract: PURPOSE:To obtain a stable output in which no bent occurs near the center of the output waveform of an MR element even when a gap between the MR element and an MR magnet is narrowed. CONSTITUTION:The magnetic sensitive pattern width of a magnetoresistance element 3 is set between 0.3 and 1 times as large as the pole width of magnet means 2, thereby obtaining a stable output without generating a bent at an output waveform even if an opposed interval between the means 2 and the element 3 is narrowed.

公开(公告)号：JPH05184120A

公开(公告)日：1993-07-23

申请号：JP36070191

申请日：1991-12-27

Applicant: SONY CORP

Inventor： SAKAMOTO SATOSHI

IPC: H02K33/18

Abstract: PURPOSE:To provide an actuator with a constant thrust in an overall movable region, by using conductive wire wound less in turns at the central part than at the both ends or at one end of a coil. CONSTITUTION:An actuator 35 in a lens mechanism 30 has a coil 31 that is wound around a cylindrical part 14A in a focus lens holding member 14, and the driving region of the coil 31 is limited between the coil 31 and a magnet 22. In the coil 31, conductive wire is wound less in turns at the center 31C and more and more to both ends 31A and 31B so that interlinkage lines of the coil 31 that crosses the magnetic field becomes larger and larger in number along both ends 31A and 31B. Then, a decrease in interlinkage magnetic flux caused by leakage flux can be compensated by an increase in interlinkage lines even when the coil 31 is driven and brought into a position, where the magnet 22 faces the end 31A or 31B of the coil 31. In this way, by using an optimal constant in the locational control for the coil 31, a constant thrust can be obtained in an overall movable region.

公开(公告)号：JPH0526888A

公开(公告)日：1993-02-02

申请号：JP20334591

申请日：1991-07-19

Applicant: SONY CORP

Inventor： SAKAMOTO SATOSHI ,  INOUE RYOKATSU

IPC: G01P3/52 ,  G02B7/04

Abstract: PURPOSE:To make counterelectromotive force at the time of constant speed transfer approximately constant and detect precise speed by using a coil whose number of turns is greater at both ends than in the middle part. CONSTITUTION:Either of a coil 9 and a magnet 8 is fixed side, while the other is movable, for instance. The coil has a cylindrical bobbin 11 on which the number of turns is greater at both ends than in the middle part. Thereby counterelectromotive force at the time of constant speed transfer is always approximately constant and precise speed detection can be performed even if the edge of the magnet 8 is at any position of the coil 9.

公开(公告)号：JPH04166906A

公开(公告)日：1992-06-12

申请号：JP29493290

申请日：1990-10-31

Applicant: SONY CORP

Inventor： SAKAMOTO SATOSHI

IPC: G01B7/00 ,  G01D5/14 ,  G02B7/02 ,  G02B7/04 ,  G02B7/08

Abstract: PURPOSE:To form an original position of a movable lens with high accuracy without being affected by change in temperature or aging by using a point where an output of a flux detecting means becomes almost zero at the boundary of the N pole and the S pole of a magnet. CONSTITUTION:A plate shape magnet 11 is mounted on a lower part of a lens holder 9. This magnet 11 is magnetized with the N pole and the S pole in the direction crossing an optical axis C. A Hall element 12 is mounted at a predetermined position of a lens barrel 2, and an original position of the lens holder 9, that is, a master lens 8 is detected by detecting a flux of the magnet 11. An output voltage of the Hall element 12 makes a steep curve in the neighborhood of a zero cross point (corresponding to the boundary of the N pole and the S pole). When environmental temperature is changed, a peak level is changed, but the zero cross point is hardly changed, which enables a sensor with high accuracy. Thus, the original position of the master lens 8 can be detected in the stable state all the time.

公开(公告)号：JPH04117157A

公开(公告)日：1992-04-17

申请号：JP41298390

申请日：1990-12-25

Applicant: SONY CORP

Inventor： SAKAMOTO SATOSHI

IPC: H02K33/18 ,  G11B21/10 ,  H01F7/06 ,  H02K41/035

Abstract: PURPOSE:To reduce axial dimension of an actuator and the number of parts by forming a part of a guide shaft of a permeable material, as an inside yoke, disposing a tubular yoke while surrounding the moving range of a movable coil and supporting a moving member through a notch extending in the axial direction of the yoke. CONSTITUTION:An actuator 11 comprises a moving body 13 and a guide shaft 14, a movable coil 25 supported on the moving body 13, an outside yoke 17 disposed surrounding the moving range of the movable coil 25, two magnets 18, 18' disposed oppositely to the opposite ends of the moving range of the movable coil 25, and the like. Yoke member 15 of the guide shaft 14 is made of a permeable material. The outside yoke 17 is provided with a notch 17a at a part in the circumferential direction. Coupling part 22 of the moving body 13 supports the moving member 7 through the notch 17a in the outside yoke 17. According to the constitution, axial dimention can be reduced and the number of parts can be reduced.