Vibration motor

Patent metadata

Field	Value
Publication number	US-10688528-B2
Application number	US-201715693589-A
Country	US
Kind code	B2
Filing date	Sep 1, 2017
Priority date	Sep 14, 2016
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

In a vibration motor, a substrate is disposed on a base plate, a coil is disposed on the substrate, and a magnet is disposed so as to be accommodated in an inner peripheral side of the coil having an annular shape by vibration. A back yoke is disposed on the magnet, a weight is disposed on the back yoke, and a case accommodates the coil, the magnet, the back yoke, and the weight. An elastic member is disposed between the case and the weight. The base plate, the case, the magnet, the back yoke, and the weight are each formed to have a rectangular shape including long sides that extend in a first direction orthogonal to a vertical direction and short sides that extend in a second direction orthogonal to the vertical direction and the first direction in a top view.

First claim

What is claimed is:

1. A vibration motor comprising:
a stationary portion which has a base plate, a substrate, a coil, and a case;
a vibrating body which has a magnet, a back yoke, and a weight and is supported by the stationary portion so as to be capable of vibrating in a vertical direction; and
an elastic member; wherein
the substrate is disposed on the base plate,
the coil is disposed on the substrate,
the magnet is disposed so as to be accommodated on an inner peripheral side of the coil having an annular shape by vibration,
the back yoke is disposed on the magnet,
the weight is disposed on the back yoke,
the case accommodates the coil, the magnet, the back yoke, and the weight,
the elastic member is disposed between the case and the weight,
the base plate, the case, the magnet, the back yoke, and the weight each have a rectangular shape including long sides that extend in a first direction orthogonal to the vertical direction and short sides that extend in a second direction orthogonal to the vertical direction and the first direction in a top view, and
the elastic member includes:
a first extension portion which extends in the first direction,
a second extension portion which extends in the first direction,
a first connection portion which directly physically connects one end portion of the first extension portion and one end portion of the second extension portion to each other,
a second connection portion which directly physically connects another end portion of the first extension portion and another end portion of the second extension portion to each other,
a third extension portion which extends in the first direction and faces the first extension portion in the second direction,
a fourth extension portion which extends in the first direction,
a third connection portion which directly physically connects one end portion of the third extension portion and one end portion of the fourth extension portion to each other,
a fourth connection portion which directly physically connects another end portion of the third extension portion and another end portion of the fourth extension portion to each other, and
a fifth connection portion which directly physically connects a center portion of the first extension portion and a center portion of the third extension portion to each other in the second direction.

2. The vibration motor according to claim 1 ,
wherein the first extension portion is inclined upward from the center portion toward both the end portions thereof,
the second extension portion is inclined upward from both the end portions toward the center portion thereof,
the third extension portion is inclined upward from the center portion to both the end portions thereof, and
the fourth extension portion is inclined upward from both the end portions toward the center portion thereof.

3. The vibration motor according to claim 1 ,
wherein the first extension portion is inclined downward from the center portion toward both the end portions thereof,
the second extension portion is inclined downward from both the end portions toward the center portion thereof,
the third extension portion is inclined downward from the center portion toward both the end portions thereof, and
the fourth extension portion is inclined downward from both the end portions toward the center portion thereof.

4. The vibration motor according to claim 1 ,
wherein widths of the first to fourth connection portions are larger than widths of the first to fourth extension portions.

5. The vibration motor according to claim 1 ,
wherein at least one damper member is disposed in a region surrounded by the first extension portion, the second extension portion, the first connection portion, and the second connection portion, and
wherein at least one damper member is disposed in a region surrounded by the third extension portion, the fourth extension portion, the third connection portion, and the fourth connection portion.

6. The vibration motor according to claim 1 ,
wherein at least one damper member is disposed in a region interposed between the first extension portion and the third extension portion.

7. The vibration motor according to claim 1 ,
wherein at least one damper member is disposed in an area occupied by the elastic member in a top view.

8. The vibration motor according to claim 1 ,
wherein the back yoke includes a rectangular top surface portion, a long side protrusion portion which protrudes downward from the long side portion of the top surface portion, and a short side protrusion portion which protrudes downward from a short side portion of the top surface portion,
a protrusion amount of the short side protrusion portion is smaller than that of the long side protrusion portion, and
a portion of a lead wire extending from a short side of the coil is disposed below the short side protrusion portion.

9. The vibration motor according to claim 8 ,
wherein an adhesive covering a portion of the lead wire is disposed below the short side protrusion portion.

10. The vibration motor according to claim 8 ,
wherein a solder fixing portion which causes a portion of the lead wire to be fixed to the substrate is disposed below the short side protrusion portion.

11. The vibration motor according to claim 1 ,
wherein a penetration hole which penetrates in a vertical direction is provided in a surface of the back yoke to which the magnet is fixed.

12. The vibration motor according to claim 1 ,
wherein the substrate includes a penetration region which penetrates vertically therethrough at least on an inner peripheral side of the coil.

13. The vibration motor according to claim 12 ,
wherein a plurality of notch portions are provided at an edge portion of the penetration region.

14. The vibration motor according to claim 12 ,
wherein a closed path pattern is provided along the periphery of the penetration region.

15. The vibration motor according to claim 12 ,
wherein two hole portions which have different shapes from each other and penetrate in the vertical direction are provided in a region inside the penetration region of the base plate.

16. The vibration motor according to claim 1 ,
wherein a recessed notch portion is provided in each of side portions of the base plate that face each other in the second direction,
the case includes side surface portions that oppose each other in the second direction,
each of the side surface portions includes a projection portion which protrudes downward, and
the projection portions are fitted into the recessed notch portions.

17. The vibration motor according to claim 2 ,
wherein the fourth extension portion includes a welded portion at an uppermost portion of its inclination.

Assignees

• Nidec Seimitsu Corp

Inventors

• Mori Zendi
• Murata Mitsuru

Classifications

• H02K1/34

  Reciprocating, oscillating or vibrating parts of the magnetic circuit · CPC title

• H02K1/12

  Stationary parts of the magnetic circuit · CPC title

• H02K33/02 Primary

  with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs · CPC title

• B06B1/045 Primary

  using vibrating magnet, armature or coil system · CPC title

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title