Fluid dynamic bearing, motor, and optical deflector

Patent metadata

Field	Value
Publication number	US-9709092-B2
Application number	US-201515123524-A
Country	US
Kind code	B2
Filing date	May 11, 2015
Priority date	May 12, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

Provided are a fluid dynamic bearing, a motor, and an optical deflector, for which a fixed shaft can be attached with little axial eccentricity. The bearing ( 10 ) is equipped with a fixed shaft ( 11 ), a sleeve ( 20 ) provided so as to be capable of rotating around the fixed shaft ( 11 ), dynamic pressure generating sections ( 22, 23 ) provided in the sleeve ( 20 ), and a lower case ( 30 ) for securing the lower end ( 11 a ) of the fixed shaft ( 11 ). In addition, the bearing is equipped with a retaining case ( 40 ), which has a chuck ( 52 ) that retains the upper end ( 11 b ) of the fixed shaft ( 11 ) secured by the lower case ( 30 ), and which can be secured to the lower case ( 30 ) in a state that does not generate pressure causing the axial center of the fixed shaft ( 11 ) to move.

First claim

The invention claimed is:

1. A fluid dynamic bearing comprising: a fixed shaft;
a sleeve provided rotatably around the fixed shaft;
a dynamic pressure generating portion provided to at least one of the fixed shaft and the sleeve;
a fixing case configured to fix a first end of the fixed shaft,
wherein the fluid dynamic bearing further comprises
a retaining case that has a chuck for retaining a second end of the fixed shaft that is fixed by the fixing case, the retaining case being configured to be fixable to the fixing case without generating a force to cause a central axis of the fixed shaft to move.

2. A motor comprising the fluid dynamic bearing according to claim 1 .

3. An optical deflector comprising the motor according to claim 2 .

4. The fluid dynamic bearing according to claim 1 , wherein the chuck is provided with a deformable retainer configured to be in contact with the fixed shaft by elastic deformation, such that the deformable retainer retains the fixed shaft.

5. A motor comprising the fluid dynamic bearing according to claim 4 .

6. An optical deflector comprising the motor according to claim 5 .

7. The fluid dynamic bearing according to claim 1 , wherein the retaining case comprises:
a retainer provided with the chuck for retaining the second end of the fixed shaft; and
a case main body to which the retainer is freely attached.

8. A motor comprising the fluid dynamic bearing according to claim 7 .

9. An optical deflector comprising the motor according to claim 8 .

10. The fluid dynamic bearing according to claim 7 , wherein the chuck is provided with a deformable retainer configured to be in contact with the fixed shaft by elastic deformation, such that the deformable retainer retains the fixed shaft.

11. A motor comprising the fluid dynamic bearing according to claim 10 .

12. An optical deflector comprising the motor according to claim 11 .

13. The fluid dynamic bearing according to claim 7 , further comprising a fastening portion at which the retainer is fastened freely to the case main body with a screw.

14. A motor comprising the fluid dynamic bearing according to claim 13 .

15. An optical deflector comprising the motor according to claim 14 .

16. The fluid dynamic bearing according to claim 13 , wherein the chuck is provided with a deformable retainer configured to be in contact with the fixed shaft by elastic deformation, such that the deformable retainer retains the fixed shaft.

17. A motor comprising the fluid dynamic bearing according to claim 16 .

18. An optical deflector comprising the motor according to claim 17 .

Assignees

• Nidec Copal Electronics Corp

Inventors

• Kikuchi Takahiro
• Hijiya Takeshi
• Uchida Toshiya

Classifications

• F16C32/0685 Primary

  for radial load only · CPC title

• F16C2370/20

  Optical, e.g. movable lenses or mirrors; Spectacles · CPC title

• F16C2380/26

  Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators · CPC title

• H02K7/08

  Structural association with bearings · CPC title

• H02K5/16

  Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields (magnetic bearings H02K7/09) · CPC title