Vibration generator having damping members for a vibrating body and leaf spring

Patent metadata

Field	Value
Publication number	US-9306429-B2
Application number	US-201313765293-A
Country	US
Kind code	B2
Filing date	Feb 12, 2013
Priority date	Mar 16, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A vibration generator includes a circumferential wall portion, a vibrating body arranged inside the circumferential wall portion in an opposing relationship with a coil and configured to reciprocatingly vibrate in one direction, a band-shaped leaf spring arranged between the vibrating body and the circumferential wall portion to support the vibrating body on the circumferential wall portion, and a damper member including a base portion attached to one of the vibrating body and the leaf spring and a tip end portion extending toward the other of the vibrating body and the leaf spring. The tip end portion of the damper member makes sliding contact with the leaf sprig or the vibrating body.

First claim

What is claimed is:

1. A vibration generator, comprising:
a circumferential wall portion;
a vibrating body arranged inside the circumferential wall portion in an opposing relationship with a coil and configured to reciprocatingly vibrate in one direction;
a band-shaped leaf spring arranged between the vibrating body and the circumferential wall portion to support the vibrating body on the circumferential wall portion; and
a damper member including a base portion attached to one of the vibrating body and the leaf spring and a tip end portion extending toward the other of the vibrating body and the leaf spring,
wherein the tip end portion of the damper member makes sliding contact with the leaf spring or the vibrating body.

2. The vibration generator of claim 1 , wherein a contact area of the tip end portion of the damper member and the leaf spring or the vibrating body varies with movement of the vibrating body.

3. The vibration generator of claim 1 , wherein the leaf spring includes a connection portion connected to the vibrating body at one longitudinal end of the leaf spring, an attachment portion attached to the circumferential wall portion at the other longitudinal end of the leaf spring and an intermediate portion formed between the connection portion and the attachment portion to extend around the vibrating body;
the connection portion and the attachment portion are arranged to interpose the vibrating body therebetween in a direction intersecting a vibration direction of the vibrating body, the connection portion being arranged at one transverse side of the vibrating body, the attachment portion being arranged at the other transverse side of the vibrating body;
the intermediate portion is arranged outward of the vibrating body in the vibration direction to extend across the vibration direction; and
the damper member is arranged between a side portion of the vibrating body positioned at the other transverse side of the vibrating body and the intermediate portion of the leaf spring.

4. The vibration generator of claim 2 , wherein the leaf spring includes a connection portion connected to the vibrating body at one longitudinal end of the leaf spring, an attachment portion attached to the circumferential wall portion at the other longitudinal end of the leaf spring and an intermediate portion formed between the connection portion and the attachment portion to extend around the vibrating body;
the connection portion and the attachment portion are arranged to interpose the vibrating body therebetween in a direction intersecting a vibration direction of the vibrating body, the connection portion being arranged at one transverse side of the vibrating body, the attachment portion being arranged at the other transverse side of the vibrating body;
the intermediate portion is arranged outward of the vibrating body in the vibration direction to extend across the vibration direction; and
the damper member is arranged between a side portion of the vibrating body positioned at the other transverse side of the vibrating body and the intermediate portion of the leaf spring.

5. The vibration generator of claim 1 , wherein the leaf spring is converted to a non-linear characteristic spring by the damper member.

6. The vibration generator of claim 2 , wherein the leaf spring is converted to a non-linear characteristic spring by the damper member.

7. The vibration generator of claim 5 , wherein the leaf spring is made of a metallic material, the vibrating body being configured to vibrate at a frequency close to a resonance frequency of the leaf spring, the damper member having a spring constant smaller than a spring constant of the leaf spring.

8. The vibration generator of claim 6 , wherein the leaf spring is made of a metallic material, the vibrating body being configured to vibrate at a frequency close to a resonance frequency of the leaf spring, the damper member having a spring constant smaller than a spring constant of the leaf spring.

9. The vibration generator of claim 5 , wherein the damper member has a resonance frequency equal to or smaller than 1/10 of a resonance frequency of the leaf spring.

10. The vibration generator of claim 6 , wherein the damper member has a resonance frequency equal to or smaller than 1/10 of a resonance frequency of the leaf spring.

11. The vibration generator of claim 1 , wherein the leaf spring includes a connection portion connected to the vibrating body at one longitudinal end of the leaf spring, an attachment portion attached to the circumferential wall portion at the other longitudinal end of the leaf spring and an intermediate portion formed between the connection portion and the attachment portion to extend around the vibrating body;
the connection portion and the attachment portion are arranged to interpose the vibrating body therebetween in a direction intersecting a vibration direction of the vibrating body, the connection portion being arranged at one transverse side of the vibrating body, the attachment portion being arranged at the other transverse side of the vibrating body;
the intermediate portion is arranged outward of the vibrating body in the vibration direction to extend across the vibration direction; and
the base portion of the damper member is attached to the vibrating body, the tip end portion of the damper member extending toward an inner surface of the attachment portion of the leaf spring.

Assignees

• Nidec Seimitsu Corp

Inventors

• Akanuma Tomohiro
• Yamada Yuuki
• Inoue Tetsuya

Classifications

• B06B1/045

  using vibrating magnet, armature or coil system · CPC title

• H02K5/04

  Casings or enclosures characterised by the shape, form or construction thereof · CPC title

• H02K33/16 Primary

  with polarised armatures moving in alternate directions by reversal or energisation of a single coil system · CPC title

• H02K5/24 Primary

  specially adapted for suppression or reduction of noise or vibrations · CPC title

• H02K33/00

  Motors with reciprocating, oscillating or vibrating magnet, armature or coil system (arrangements for handling mechanical energy structurally associated with motors H02K7/00, e.g. H02K7/06) · CPC title