Electromagnetic relay

Patent metadata

Field	Value
Publication number	US-10930459-B2
Application number	US-201816143955-A
Country	US
Kind code	B2
Filing date	Sep 27, 2018
Priority date	Oct 2, 2017
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

An electromagnetic relay includes a fixed contact part, a movable contact part, an armature, an electromagnet, and a base. The fixed contact part includes a fixed contact. The movable contact part includes a movable contact that faces the fixed contact. The armature is formed of a magnetic material and configured to bring the movable contact into or out of contact with the fixed contact. The electromagnet is configured to generate a magnetic field to move the armature. The base holds the fixed contact part, the movable contact part, and the electromagnet. The electromagnetic relay further includes multiple electrodes configured to generate an electric field between the electrodes.

First claim

What is claimed is:

1. An electromagnetic relay comprising:
a fixed contact part including a fixed contact;
a movable contact part including a movable contact that faces the fixed contact;
an armature formed of a magnetic material, the armature being configured to bring the movable contact into or out of contact with the fixed contact;
an electromagnet configured to generate a magnetic field to move the armature;
a base holding the fixed contact part, the movable contact part, and the electromagnet; and
a plurality of electrodes configured to generate an electric field between the electrodes, the electrodes facing each other without contacting each other, the electrodes being provided near at least one of the fixed contact and the movable contact and insulated from the fixed contact and the movable contact.

2. The electromagnetic relay as claimed in claim 1 , wherein the electrodes are configured to generate the electric field greater than an electric field generated between the fixed contact and the movable contact.

3. The electromagnetic relay as claimed in claim 1 , wherein the electrodes include a first electrode and a second electrode that face the fixed contact part and the movable contact part, respectively.

4. The electromagnetic relay as claimed in claim 3 , wherein
the first electrode and the second electrode are connected to the movable contact part and the fixed contact part, respectively, and
a voltage is applied to the first electrode and the second electrode from the movable contact part and the fixed contact part, respectively.

5. The electromagnetic relay as claimed in claim 1 , further comprising:
a cover surrounding a body of the electromagnetic relay, the body including the fixed contact part, the movable contact part, the armature, the electromagnet, and the base, and
a recess is formed in one or both of the cover and the base near the electrodes.

6. The electromagnetic relay as claimed in claim 1 , further comprising:
an adhesive substance provided on surfaces of the electrodes or near the electrodes.

7. The electromagnetic relay as claimed in claim 1 , wherein the electrodes are provided close enough to the at least one of the fixed contact and the movable contact to attract and collect a charged foreign substance around the at least one of the fixed contact and the movable contact.

8. An electromagnetic relay, comprising:
a fixed contact and a movable contact that face each other;
an armature configured to bring the movable contact into or out of contact with the fixed contact;
an electromagnet configured to generate a magnetic field to move the armature; and
a plurality of electrodes spaced from each other and from the fixed contact and the movable contact, the electrodes being configured to generate an electric field between the electrodes, the electrodes facing each other without contacting each other, the electrodes being provided near at least one of the fixed contact and the movable contact and insulated from the fixed contact and the movable contact.

Assignees

• Fujitsu Component Ltd

Inventors

• Li Ying
• Kaneko Masahiro
• Yatsu Nobuo
• Takahashi Kohei
• Koshimura Katsuaki
• Kitahara Miki

Classifications

• H01H1/60 Primary

  Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces (cleaning by normal sliding of contacts H01H1/18, H01H1/36) · CPC title

• H01H50/023

  Details concerning sealing, e.g. sealing casing with resin · CPC title

• H01H50/00 Primary

  Details of electromagnetic relays ({H01H51/28 takes precedence;} electric circuit arrangements H01H47/00; details of electrically-operated selector switches H01H63/00) · CPC title

• H01H50/56

  Contact spring sets · CPC title

• H01H45/02

  Bases; Casings; Covers (frames for mounting two or more relays or for mounting a relay and another electric component H02B1/01, H04Q1/08, H05K) · CPC title