Vibration generation device and electronic device

Patent metadata

Field	Value
Publication number	US-10644565-B2
Application number	US-201815894612-A
Country	US
Kind code	B2
Filing date	Feb 12, 2018
Priority date	Feb 21, 2017
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

A vibration generation device includes a rotor rotatable about a rotation axis, the rotor including a weight having a center of gravity that is eccentric with respect to the rotation axis. A shaft is inserted into the rotor and rotatably supports the rotor. A restriction part is disposed further inward than the weight in a radial direction, the restriction part being attached to one end of the shaft for restricting movement of the rotor in an axial direction.

First claim

What is claimed is:

1. A vibration generation device comprising:
a rotor configured to be rotatable about a rotation axis, the rotor including a weight attached to a back yoke and having a center of gravity that is eccentric with respect to the rotation axis;
a shaft inserted into the rotor and configured to rotatably support the rotor; and
a restriction part disposed further inward than the weight in a radial direction, the restriction part being attached to one end of the shaft, and the restriction part restricting a movement of the rotor in an axial direction,
wherein the one end of the shaft and the restriction part are disposed at a first height with respect to an other end of the shaft, the first height of the shaft and the restriction part being equal to or lower than a larger value between a height of the weight and a height of the back yoke with respect to the other end of the shaft.

2. The vibration generation device according to claim 1 ,
wherein the restriction part is disposed at or below a height of the rotor with respect to the other end of the shaft.

3. The vibration generation device according to claim 1 ,
wherein one end of the shaft is disposed at or below a height of the rotor with respect to the other end of the shaft.

4. The vibration generation device according to claim 1 ,
wherein part of the restriction part faces the back yoke in the axial direction.

5. The vibration generation device according to claim 1 ,
wherein the weight is provided at a highest position in the rotor with respect to the other end of the shaft.

6. The vibration generation device according to claim 1 , further comprising a support plate that supports the other end of the shaft,
wherein the support plate includes a small diameter part whose size from the rotation axis to an end of an outer side of the small diameter part in the radial direction is smaller than a maximum radius of the rotor.

7. The vibration generation device according to claim 1 , further comprising a support plate that supports the other end of the shaft,
wherein the support plate includes a large diameter part whose size from the rotation axis to an end of an outer side of the large diameter part in the radial direction is larger than a maximum radius of the rotor.

8. The vibration generation device according to claim 7 ,
wherein the support plate includes a projection that stands up from the large diameter part in a thickness direction of the support plate.

9. An electronic device comprising the vibration generation device according to claim 1 .

10. The electronic device according to claim 9 , further comprising:
a visual recognition part that is visually recognizable from outside the electronic device; and
an opening that is provided in the visual recognition part,
wherein the rotor is disposed in the opening.

11. The electronic device according to claim 10 ,
wherein part of at least one of the rotor and the shaft projects from the visual recognition part to the outside.

Assignees

• Seiko Instr Inc

Inventors

• Iino Akihiro
• Kasuga Masao

Classifications

• G04B47/00

  Time-pieces combined with other articles which do not interfere with the running or the time-keeping of the time-piece ({clockwork cases for special purposes G04B37/12; clocks with magnifying glass built in the face G04B39/00; time-pieces in which parts or cases produce special effects, e.g. aesthetic effects, G04B45/00, particularly with inscriptions or pictures moved by hand G04B45/003, with specially shaped cases or parts G04B45/0069; combination of} writing or drawing implements with devices for indicating time B43K29/087; combined with cameras, projectors, or photographic printing apparatus G03B29/00) · CPC title

• H02K7/075 Primary

  using crankshafts or eccentrics · CPC title

• H02K2205/03

  Machines characterised by thrust bearings · CPC title

• H02K7/086

  radially supporting the rotor around a fixed spindle; radially supporting the rotor directly (H02K7/09 takes precedence) · CPC title

• B06B1/16 Primary

  operating with systems involving rotary unbalanced masses · CPC title