Vibration motor

Patent metadata

Field	Value
Publication number	US-10512937-B2
Application number	US-201715702825-A
Country	US
Kind code	B2
Filing date	Sep 13, 2017
Priority date	Sep 14, 2016
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A vibration motor includes a stationary portion, a vibrating body, an elastic member, and a damper member. The elastic member includes a first extending portion, a second extending portion, a first connection portion, a second connection portion, a third extending portion, a fourth extending portion, a third connection portion, a fourth connection portion, and a fifth connection portion. The damper member includes a first longitudinal portion and a second longitudinal portion. An inner section including the first extending portion, the third extending portion, and the fifth connection portion directly opposes an upper surface of a weight in plan view in an up-down direction.

First claim

What is claimed is:

1. A vibration motor comprising:
a stationary portion that includes a base plate, a substrate, a coil, and a case;
a vibrating body that includes a magnet, a back yoke, and a weight, and that is supported so that the vibrating body is capable of vibrating in an up-down direction with respect to the stationary portion;
an elastic member; and
a damper member,
wherein the substrate is disposed on the base plate,
wherein the coil is disposed on the substrate,
wherein the magnet is disposed so that the magnet is capable of being accommodated at an inner peripheral side of the coil due to vibration, the coil being ring-shaped,
wherein the back yoke is disposed on the magnet,
wherein the weight is disposed on the back yoke,
wherein the case accommodates the coil, the magnet, the back yoke, and the weight,
wherein the elastic member is disposed between the case and the weight,
wherein, in plan view in the up-down direction, the weight extends in a longitudinal direction orthogonal to the up-down direction,
wherein a direction that is orthogonal to the up-down direction and the longitudinal direction is a lateral direction of the weight,
wherein the elastic member includes
a first extending portion that extends in the longitudinal direction,
a second extending portion that extends in the longitudinal direction,
a first connection portion that connects a first end portion of the first extending portion and a first end portion of the second extending portion,
a second connection portion that connects a second end portion of the first extending portion and a second end portion of the second extending portion,
a third extending portion that extends in the longitudinal direction and that opposes the first extending portion in the lateral direction,
a fourth extending portion that extends in the longitudinal direction,
a third connection portion that connects a first end portion of the third extending portion and a first end portion of the fourth extending portion,
a fourth connection portion that connects a second end portion of the third extending portion and a second end portion of the fourth extending portion, and
a fifth connection portion that connects in the lateral direction an inner portion of the first extending portion in the longitudinal direction and an inner portion of the third extending portion in the longitudinal direction,

wherein the first extending portion is inclined upward from an inner side thereof in the longitudinal direction towards both of the end portions thereof,
wherein the second extending portion is inclined upward from both of the end portions thereof towards an inner side thereof in the longitudinal direction,
wherein the third extending portion is inclined upward from an inner side thereof in the longitudinal direction towards both of the end portions thereof,
wherein the fourth extending portion is inclined upward from both of the end portions thereof towards an inner side thereof in the longitudinal direction,
wherein the second extending portion includes a first fixing portion at an uppermost portion of an inclination thereof,
wherein the fourth extending portion includes a second fixing portion at an uppermost portion of an inclination thereof,
wherein the fifth connection portion is fixed to an upper surface of the weight,
wherein the first fixing portion and the second fixing portion are fixed to the case,
wherein the damper member is fixed to the upper surface of the weight,
wherein the damper member includes
a first longitudinal portion that, in the plan view in the up-down direction, extends in the longitudinal direction so as to overlap a region that extends from a location at the second extending portion on a first side of the first fixing portion in the longitudinal direction to the first fixing portion and to a location at the second extending portion on a second side of the first fixing portion in the longitudinal direction, and
a second longitudinal portion that, in the plan view in the up-down direction, extends in the longitudinal direction so as to overlap a region that extends from a location at the fourth extending portion on a first side of the second fixing portion in the longitudinal direction to the second fixing portion and to a location at the fourth extending portion on a second side of the second fixing portion in the longitudinal direction, and

wherein an inner section including the first extending portion, the third extending portion, and the fifth connection portion directly opposes the upper surface of the weight in the plan view in the up-down direction.

2. The vibration motor according to claim 1 , wherein the first longitudinal portion overlaps the second extending portion in an entirety thereof in the plan view in the up-down direction, and
wherein the second longitudinal portion overlaps the fourth extending portion in an entirety thereof in the plan view in the up-down direction.

3. The vibration motor according to claim 1 , wherein the damper member is ring-shaped.

4. The vibration motor according to claim 3 , wherein the damper member is formed from one member.

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

6. 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 extending portions.

7. The vibration motor according to claim 1 , wherein the back yoke includes a rectangular top surface portion and long-side protruding portions, the top surface portion including long-side portions in the longitudinal direction and short-side portions in the lateral direction, the long-side protruding portions protruding downward from the long-side portions of the top surface portion, and
wherein the back yoke does not include short-side protruding portions that protrude downward from the short-side portions of the top surface portion.

8. The vibration motor according to claim 7 , wherein a surface of the back yoke to which the magnet is fixed has a through hole that extends therethrough in the up-down direction.

9. The vibration motor according to claim 7 , further comprising a lower damper member at the inner peripheral side of the coil.

10. The vibration motor according to claim 7 , wherein the substrate has a through region that extends in the up-down direction therethrough at the inner peripheral side of the coil, and
wherein edge portions of the through region have a plurality of cutout portions.

11. The vibration motor according to claim 10 , wherein a closed circuit pattern is provided along a periphery of the through region.

12. The vibration motor according to claim 11 , wherein a region of the base plate within the through region has two hole portions having different shapes and extending therethrough in the up-down direction.

13. The vibration motor according to claim 10 , wherein a region of the base plate within the through region has two hole portions having different shapes and extending therethrough in the up-down direction.

14. The vibration motor according to claim 7 , wherein the base plate includes side portions that oppose each other in the lateral direction, each side portion having a cutout recessed portion,
wherein the case includes side surface portions that oppose each other in the lateral direction,
wherein each side surface portion has a protruding portion that protrudes downward, and
wherein each protruding portion is fitted to a corresponding one of the cutout recessed portions.

Assignees

• Nidec Seimitsu Corp

Inventors

• Mori Zendi
• Murata Mitsuru

Classifications

• B06B1/045 Primary

  using vibrating magnet, armature or coil system · CPC title

• H02K1/34

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

• H02K35/02

  with moving magnets and stationary coil systems · CPC title

• H02K35/00

  Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit (arrangements for handling mechanical energy structurally associated with generators H02K7/00, e.g. H02K7/06) · CPC title

• H02K33/06

  with polarised armatures · CPC title