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1. 发明专利

JP2590334B2 失效
公开(公告)号：JP2590334B2
公开(公告)日：1997-03-12
申请号：JP11078687
申请日：1987-05-08
申请人： NIHON DENSAN NAGANO KK
发明人： KITAHARA HARUO , OOSHITA TAKESHI
IPC分类号： H02K29/00 , F16C19/54 , G11B19/20 , H02K5/173 , H02K21/22 , H02K29/08

2. 发明专利

JPH06325484A RECORDING MEDIUM DRIVING DEVICE 失效
公开(公告)号：JPH06325484A
公开(公告)日：1994-11-25
申请号：JP13280993
申请日：1993-05-10
申请人： NIHON DENSAN NAGANO KK
发明人： OGAWA TOKUKADO
IPC分类号： G11B19/20 , G11B25/04 , H02K29/00
摘要： PURPOSE:To increase the recording density on a recording medium and to realize a large recording capacity by preventing the vibration of a spindle motor to improve rotating accuracy while reducing the thickness and size over the entire part of the device as far as possible. CONSTITUTION:A reduced diameter part 7a at the bottom end of a stationary shaft body 7 is fitted into a fitting hole 2a penetrating a base plate 2. The reduced diameter part 7a and the base plate 2 are fixed by laser beam welding. A cylindrical member 8 is erected on the base plate 2 on the outer peripheral side of the stationary shaft body 7. The respective fitting projecting parts 12a, 12b of a ring member 11 are fitted into the peripheral spacing of the outer peripheral part 14b1 of core teeth 14b of a stator core 14 to each other. The annular base part 14a of the stator core 14 is fitted and fixed onto the cylindrical member 8 and the rear surface of the ring member 11 is pressed atop the base plate 2. The base plate 2, the cylindrical member 8, the annular base part 14a, the core teeth 14b, the ring member 11 and the stator coil 16 are integrally fixed by packing adhesives 17.

3. 发明专利

JPH06311676A MOTOR 失效
公开(公告)号：JPH06311676A
公开(公告)日：1994-11-04
申请号：JP6344993
申请日：1993-02-26
申请人： NIHON DENSAN NAGANO KK
发明人： HARA YOSHIAKI
IPC分类号： H02K1/14 , H02K1/18 , H02K3/18
摘要： PURPOSE:To provide a motor wherein, even when a rotor magnet is not skew- magnetized, a cogging torque is reduced; vibrations and noises are reduced thanks to the high rigidity of a stator core and a coil which has been molded in advance can be used as a stator coil. CONSTITUTION:A tsator core 10 is composed of a ring-shaped yoke part 12 and a core tooth group part 14. Individual core teeth 16 for the core tooth group part 14 are composed of radial-direction parts 16a and of circumferential- direction expansion parts 16b which are faced with a rotor magnet 18 at outer end parts of the radial-direction parts 16a. The individual radial-direction parts 16a are arranged at intervals in the circumferential direction, the circumferential-direction expansion parts 16b of the adjacent teeth 16 are continued in the circumferential direction via thin parts 16c at boundary parts. A molded coil 20 which has been aligned and wound in a square pillar shape and fixed is fitted externally as a stator coil in the radial direction parts 16a of the individual core teeth 16. The ring-shaped yoke part 12 is fitted and fixed at the inner circumferential side of the radial-direction parts 16a.

4. 发明专利

JPH06178486A SPINDLE MOTOR 失效
公开(公告)号：JPH06178486A
公开(公告)日：1994-06-24
申请号：JP35042492
申请日：1992-12-02
申请人： NIHON DENSAN NAGANO KK
发明人： MIYAWAKI TSUYOSHI , OGUCHI TOKUKAZU
IPC分类号： H02K5/16 , H02K5/173 , H02K5/24
摘要： PURPOSE:To restrain the vibration of a motor to a low level as a whole when the motor is turned. CONSTITUTION:An aluminum die-cast housing 10 is passed through a through hole 12 through the inside of a cylindrical protrusion 10a and the inside of a ring-shaped protrusion 10b. A fixed support 30 in which a flange part 30a protrudes from the outer circumferential part at the lower end and which is made of an iron-based material is force-fitted into the through hole 12 from the lower part. The lower part of the fixed support 30 is fitted into, and fixed to, the inside of the through hole 12 by a stationary fitting operation. The ring-shaped surface at the flange part 30a of the fixed support 30 is brought into close contact with the ring-shaped rear edge of the cylindrical protrusion 10a. The cylindrical protrusion 10a is set to a state that it is connected to the flange part 30a of the fixed support 30 in the shaft-line direction, and the strength and the rigidity of the fixation of the housing 10 to the fixed support 30 are increased.

5. 发明专利

JPH0638436A SPINDLE MOTOR 失效
公开(公告)号：JPH0638436A
公开(公告)日：1994-02-10
申请号：JP20755592
申请日：1992-07-10
申请人： NIHON DENSAN NAGANO KK
发明人： YAZAKI ASAO
IPC分类号： F16J15/43 , F16J15/40 , H02K5/15 , H02K5/173
摘要： PURPOSE:To make a fixed section or a rotary section easily retain a sealing unit while the sealing property between them is assured, and to eliminate the possibility of sealing failures caused by improper adhesive application, pin holes and an uncured adhesive. CONSTITUTION:A first annular groove 50 is formed along the inner circumferential surface of a sealing section 26d. A resilient annular body 52 is fitted into the first annular groove 50 over the entire circumference thereof while it is vertically compressed, so that the annular body is held by the groove. An inner projecting portion 52a of the resilient annular body 52 is fitted into a second annular groove 62 of a sealing unit 54. While the inner projecting portion 52a is vertically pressed over the entire circumference thereof, the sealing unit 52 is retained by a sealing section 26d.

6. 发明专利

JPH05300706A 失效
公开(公告)号：JPH05300706A
公开(公告)日：1993-11-12
申请号：JP12144692
申请日：1992-04-14
申请人： NIHON DENSAN NAGANO KK
发明人： NAKAJIMA TOMOSHI , OGAWA TOKUKADO , KITAMURA YOICHI , MIYAJIMA KAZUTO
IPC分类号： H02K5/04 , H02K15/02
摘要： PURPOSE:To make efficient manufacture possible by reducing the numbers of applications of an ultraviolet-ray setting adhesive agent and ultraviolet radiation in the case of gluing adjoining two parts to a peripheral wall part. CONSTITUTION:An ultraviolet-ray setting adhesive agent 64 is applied from above to the cut-off parts between a plurality of protrusions 62c and 62c provided in the peripheral part of the approximately-J-shaped bent part 62b of a seal cap member 62. The adhesive agent 64 extends through the cut-off parts also to all the peripheries of the intermediate inner peripheral surface 22c and the peripheral upper surface of the upside pole piece 56 in a first sealing part 54. And when ultraviolet rays are emitted on the adhesive agent 64 from above the seal cap member 62, the ultraviolet rays extend all over the adhesive agent 64 through the cut-off parts, and the adhesive agent 64 is hardened.

7. 发明专利

JPH05252682A 失效
公开(公告)号：JPH05252682A
公开(公告)日：1993-09-28
申请号：JP7905492
申请日：1992-02-28
申请人： NIHON DENSAN NAGANO KK
发明人： OGAWA TOKUKADO
IPC分类号： H02K3/50 , H02K5/22 , H02K21/22
摘要： PURPOSE:To provide a spindle motor in which connecting work of the end of coil lead out wire to a land part is facilitated by preventing the end of coil lead out part from being damaged due to rubbing. CONSTITUTION:A flexible circuit board 12 equipped with a surface part 14 corresponding to stator having a land part 13 is provided. The surface part 14 is opposed to one end surface of a stator 5. A slit part 18 to be inserted with the end 11 of coil lead out wire of the stator 5 is provided in the vicinity of the land part 13 of the surface part 14 corresponding to the stator. The end part 11 of coil lead out wire is led out from the stator 5 side through the slit part 18 to the land part 13 side where it is connected with the land part 13.

8. 发明专利

JPH0549199A FIXING STRUCTURE OF SPINDLE MOTOR 失效
公开(公告)号：JPH0549199A
公开(公告)日：1993-02-26
申请号：JP21932791
申请日：1991-08-06
申请人： NIHON DENSAN NAGANO KK
发明人： OGAWA TOKUKADO
IPC分类号： H02K5/00 , G11B19/20 , H02K21/22
摘要： PURPOSE:To enhance the performance of spindle motor and disc unit by driving a screw into a pipe part and fixing the spindle motor to the disc unit while sandwiching the disc unit, at the mounting part thereof, by means of the step part of shaft and a flange. CONSTITUTION:A spindle motor 20 is fixed to a disc unit A by inserting a pipe part 31 into a fixing hole 34 made through the base plate (part to be fixed) of the disc unit A with no rattling and then screwing the external thread 331 of a fixing screw 33 into the internal thread 311 of the pipe part 31 thereby sandwiching the base plate P by means of the step part 211 of a shaft 21 and a flange 32. The pipe part 31 is formed thinner than the shaft 21 at the lower end of the shaft 21. Consequently, dust is blocked from flowing through the gap between the spindle motor 20 and the disc unit A and thereby the performance of the spindle motor 20 and the disc unit A can highly accurately be maintained.

9. 发明专利

JPH04282431A APPARATUS FOR MEASURING MOUNTING CHARACTERISTICS OF BEARING 失效
公开(公告)号：JPH04282431A
公开(公告)日：1992-10-07
申请号：JP6943691
申请日：1991-03-11
申请人： NIHON DENSAN NAGANO KK
发明人： NAKAJIMA TOMOSHI
IPC分类号： G01M13/04
摘要： PURPOSE:To measure the characteristics of a bearing in the state mounted on a rotary device. CONSTITUTION:An apparatus 20 for measuring the mounting characteristics of bearing 13,14 is equipped with an external vibration cut-off mechanism 21 supporting a rotary device 10 having the rotary body 15 supported by the bearings 13,14 and preventing the transmission of external vibration to the rotary device 10, a pre-load applying mechanism 22 applying pre-load to the rings of the bearings and characteristic measuring devices 23,24,25 measuring the characteristics of the bearings 13,14. External force is applied to the rings of the bearings 13,14 provided to the rotary device 10 by the pre-load applying mechanism 22 to preliminarily remove the backlash (gap) in the bearings 13,14. Thereafter, the rotary device 10 is placed on the external vibration cut-off mechanism 21 so as not to receive the effect of the vibration from the outside to rotate the rotary body 15. The deflection and vibration of the bearings during the rotation of the rotary body 15 are measured by the characteristic measuring devices 23,24,25.

10. 发明专利

JPH04208053A SPINDLE MOTOR 失效
公开(公告)号：JPH04208053A
公开(公告)日：1992-07-29
申请号：JP33851690
申请日：1990-11-30
申请人： NIHON DENSAN NAGANO KK
发明人： KODAIRA YOSHIYUKI , SEKIGUCHI SHUNICHI
IPC分类号： H02K5/10 , H02K21/22
摘要： PURPOSE:To maintain cleanness in a containing chamber and to prevent trouble due to contamination by providing an impurity adhering layer for preventing scattering of impurities at a part of a bracket. CONSTITUTION:An insulating sheet 51 is arranged on the inner periphery (more particularly at a position between an annular protrusion 18 and an annular outer wall 53) of a bracket body 14. An impurity adhering layer 52 is further provided on the rear surface of an insulating sheet 51. Thus, since the layer 52 is provided, if impurities such as cutting chips, dusts, magnetic powder, etc., in a rotor 20 are dropped on the inner surface of the body 14, the dropped impurities adhere to the layer 52. Accordingly, the impurities do not again fly up from the layer 52 even by the rotation of the rotor 20, and not enter a containing chamber such as a disk chamber to prevent contamination in the chamber.

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