Vibration generating device and electronic device

Patent metadata

Field	Value
Publication number	US-10715020-B2
Application number	US-201715822359-A
Country	US
Kind code	B2
Filing date	Nov 27, 2017
Priority date	Nov 28, 2016
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

In accordance with one aspect of the present disclosure, a vibration generating device includes a protruding part; a base provided with the protruding part and formed of a magnetic body; an annular coil surrounding the protruding part; a plate facing the base and formed of a magnetic body; and an elastic member supporting the plate with respect to the base. The plate and the base constitute magnetic circuit.

First claim

What is claimed is:

1. A vibration generating device comprising:
a protruding part;
a base formed with a magnetic body;
an annular coil surrounding the protruding part;
a plate facing the base and formed with a magnetic body; and
an elastic member supporting the plate with respect to the base,
wherein
the protruding part is provided at the base, and
the plate and the base form a magnetic circuit, and
a flange part facing the plate is provided in a region of the base outside of an outer peripheral part of the coil,
a magnetic gap is provided between the outer peripheral part of the plate and the flange part, and
the elastic member is arranged in the magnetic gap.

2. The vibration generating device according to claim 1 , wherein the flange part is a magnetic pole part.

3. The vibration generating device according to claim 1 , wherein
an outer peripheral end part of the plate is bent toward the coil, and
the outer peripheral end part of the plate is arranged inside an outer peripheral end part of the base.

4. The vibration generating device according to claim 1 , wherein
in the protruding part, a recessed part is provided at a surface facing the plate, and
the elastic member is arranged at the recessed part.

5. The vibration generating device according to of claim 1 , wherein in the plate, a weight is provided at a surface facing the base.

6. The vibration generating device according to claim 1 , wherein
the elastic member includes a magnetic material, and
the elastic member is a member forming the magnetic circuit.

7. An electronic device comprising:
a housing;
a contact member attached to the housing; and
a vibration generating device according to claim 1 ,
wherein
the vibration generating device is coupled or fixed to the housing or the contact member directly or through other member.

Assignees

• Minebea Mitsumi Inc

Inventors

• Umehara Mikio
• Kamogi Yutaka

Classifications

• 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

• H01F7/20

  without armatures (cores H01F3/00; coils H01F5/00 {; shaping metal by applying magnetic forces B21D26/14; electromagnets specially adapted for NMR applications G01R33/381}) · CPC title