Electromagnetic device and electromagnetic relay using same

Patent metadata

Field	Value
Publication number	US-10685801-B2
Application number	US-201815876072-A
Country	US
Kind code	B2
Filing date	Jan 19, 2018
Priority date	Sep 11, 2015
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

An electromagnetic device includes a spool having a cylindrical body with a through hole, a secondary coil formed in a spiral shape along an outer peripheral surface of the cylindrical body and formed with a closed circuit by metal plating, and a primary coil formed of a conductive wire wound around the secondary coil via an insulating material covering the secondary coil. An induced current, generated by applying a voltage to any one of the primary coil and the secondary coil, is allowed to flow to the other coil different from the one coil.

First claim

The invention claimed is:

1. An electromagnetic device comprising:
a spool having a cylindrical body with a through hole;
a secondary coil formed in a spiral shape along an outer peripheral surface of the cylindrical body and formed with a closed circuit by metal plating; and
a primary coil formed of a conductive wire wound around the secondary coil via an insulating material covering the secondary coil,
wherein an induced current, generated by applying a voltage to any one of the primary coil and the secondary coil, is allowed to flow to the other coil different from the one coil,
wherein a guard portion is provided at at least one end of the cylindrical body, and
wherein both ends of the secondary coil, formed on the outer peripheral surface of the cylindrical body, are electrically connected to each other by a lead wire formed by metal plating through a communication hole provided in the cylindrical body and the guard portion and an inner peripheral surface of the through hole in the cylindrical body.

2. The electromagnetic device according to claim 1 , further comprising:
an operation indicator lamp fixed to the guard portion and electrically connected to the secondary coil.

3. The electromagnetic device according to claim 2 , wherein the operation indicator lamp is a light-emitting diode.

4. An electromagnetic relay comprising:
a base; and
an electromagnetic device incorporated into the base, and comprising:
a spool having a cylindrical body with a through hole;
a secondary coil formed in a spiral shape along an outer peripheral surface of the cylindrical body and formed with a closed circuit by metal plating; and
a primary coil formed of a conductive wire wound around the secondary coil via an insulating material covering the secondary coil,
wherein an induced current, generated by applying a voltage to any one of the primary coil and the secondary coil, is allowed to flow to the other coil different from the one coil,
wherein a movable iron piece is disposed so as to be attracted by magnetic force to a magnetic pole portion of an iron core protruding from the guard portion provided at at least one end of the cylindrical body among iron cores inserted through the through holes of the spool, the magnetic force being generated by applying a voltage to any one of the primary coil and the secondary coil, and
wherein the movable iron piece is provided with a notch through which light of the operation indicator lamp is transmitted.

5. The electromagnetic relay according to claim 4 , further comprising:
an operation check window configured to transmit the light of the operation indicator lamp on an outer peripheral surface of a casing fitted to the base.

6. The electromagnetic relay according to claim 5 , wherein the operation check window is a transparent window provided in the casing.

Assignees

• Omron Tateisi Electronics Co

Inventors

• Shimoda Seiki
• Okubo Tsuyoshi

Classifications

• H01H9/161

  comprising light emitting elements · CPC title

• H01H50/06

  having windows; Transparent cases or covers · CPC title

• H01H50/44 Primary

  Magnetic coils or windings · CPC title

• H01H50/04

  Mounting complete relay or separate parts of relay on a base or inside a case · CPC title

• H01H50/08

  Indicators; Distinguishing marks · CPC title