VIBRATION MOTOR

• US 20180241293A1
• Filed: 02/20/2018
• Published: 08/23/2018
• Est. Priority Date: 02/22/2017
• Status: Active Application

• Current Assignee: Nidec Seimitsu Corporation (Nidec Corporation)
• Original Assignee: Nidec Seimitsu Corporation (Nidec Corporation)
• Inventors: MIYAZAKI, Masahiko
• Application Number:
  US15/899,541
• Publication Number:
  US 20180241293A1
• Time in Patent Office: Days
• CPC Class Codes: B06B 1/045 using vibrating magnet, armature or coil system
• CPC Class Codes: H02K 33/02 with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
• CPC Class Codes: H02K 33/16 with polarised armatures moving in alternate directions by reversal or energisation of a single coil system

Abstract

A vibration motor includes a stationary portion, a vibrating body supported to vibrate in a lateral direction with respect to the stationary portion, and an elastic member positioned between the stationary portion and the vibrating body. The elastic member includes two or more first bent portions bent in a longitudinal direction orthogonal to the lateral direction, one or more second bent portions bent toward a side opposite to the first bent portion in the longitudinal direction, and flat portions connected to ends of the first bent portions and the second bent portions. The number of first bent portions is greater than that of second bent portions, the first bent portions and the second bent portions are alternately connected by the flat portions, and the maximum width of the first bent portions in the lateral direction is smaller than the minimum width of the second bent portions in the lateral direction.

Claims

1. A vibration motor comprising:

a stationary portion;

a vibrating body that is supported to vibrate in a lateral direction with respect to the stationary portion; and

an elastic member that is positioned between the stationary portion and the vibrating body, wherein

the elastic member includes

two or more first bent portions that are bent in a longitudinal direction orthogonal to the lateral direction,

one or more second bent portions that are bent toward a side opposite to the first bent portion in the longitudinal direction, and

flat portions that are connected to respective ends of the first bent portions and respective ends of the second bent portions,

the number of first bent portions is greater than the number of second bent portions,

the first bent portions and the second bent portions are alternately connected by the flat portions, and

a maximum width of the first bent portions in the lateral direction is smaller than a minimum width of the second bent portions in the lateral direction.

2. The vibration motor according to claim 1, wherein

all the widths of the first bent portions in the lateral direction are substantially the same, and

all the widths of the second bent portions in the lateral direction are substantially the same.

3. The vibration motor according to claim 1, wherein

the stationary portion has a casing and a coil portion,

the vibrating body has a first weight portion, a second weight portion, and a magnet portion,

the first weight portion and the second weight portion are disposed at positions with the magnet portion being interposed between the first weight portion and the second weight portion in the lateral direction,

the magnet portion has a first magnet having a magnetic flux direction in the lateral direction, a second magnet having a magnetic flux direction opposite to the magnetic flux direction of the first magnet in the lateral direction, and a third magnet which is interposed between the first magnet and the second magnet in the lateral direction and which has a magnetic flux direction in a longitudinal direction orthogonal to the lateral direction,

the magnet portion and the coil portion are disposed to face each other in the longitudinal direction,

a coil member included in the coil portion generates magnetic flux in the lateral direction, and

a length of the coil member in the lateral direction is shorter than a length of the magnet portion in the lateral direction.

4. The vibration motor according to claim 3, wherein

the length of the magnet portion in the lateral direction is shorter than an interval between the first weight portion and the second weight portion in the lateral direction,

a gap is disposed between the first weight portion and the first magnet, and

a gap is disposed between the second weight portion and the second magnet.

5. The vibration motor according to claim 4, wherein

each of the first weight portion and the second weight portion includes a weight member, and

each of the first weight portion and the second weight portion does not have a member at a position between the weight member and the magnet portion.

6. The vibration motor according to claim 4, wherein

the magnet portion further has a back yoke that is disposed outside of the first magnet and outside of the second magnet in the lateral direction.

7. The vibration motor according to claim 4, wherein

each of the first weight portion and the second weight portion includes a weight member and a back yoke disposed at a position between the weight member and the magnet portion.

8. The vibration motor according to claim 4, wherein

the coil portion has a damper member that is disposed further outside in the lateral direction than both end portions of the coil member in the lateral direction.

9. The vibration motor according to claim 6, wherein

the coil portion has a damper member that is disposed further outside in the lateral direction than both end portions of the coil member in the lateral direction.

10. The vibration motor according to claim 7, wherein

the coil portion has a damper member that is disposed further outside in the lateral direction than both end portions of the coil member in the lateral direction.