Seal structure of electronic device, electronic device provided with seal structure, and manufacturing method of electronic device

Patent metadata

Field	Value
Publication number	US-11170957-B2
Application number	US-201716471641-A
Country	US
Kind code	B2
Filing date	Dec 13, 2017
Priority date	Feb 28, 2017
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A seal structure of an electronic device is provided with: a housing in which a base and a case are sealed by a sealant and a closed space enclosed by the base and the case is provided; and at least one of terminals having a body and a leg. The base includes a terminal groove that accommodates the body, a through hole that accommodates the leg, and a placement area forming part that forms a placement area for the sealant together with the body, the leg, the terminal groove, and the through hole, the placement area extending from the outside of the housing toward the closed space through an interval between the through hole and the leg and an interval between the terminal groove and the body.

First claim

The invention claimed is:

1. A seal structure of an electronic device, comprising:
a housing that includes a base having a connection end face and a case in a box shape covering one end opening surface in a direction intersecting with the connection end face of the base, the housing having on an inside a closed space enclosed by the base and the case, with a sealant sealing the base and the case; and
at least one of terminals that includes a body extending in the direction intersecting with the connection end face of the base and disposed in the closed space, the body being fixed to the base, and a leg extending from the body to an outside of the housing through the base in the direction intersecting with the connection end face of the base,
wherein the base includes
a terminal groove opened to the closed space and configured to accommodate the body,
a through hole extending from the terminal groove in the direction intersecting with the connection end face of the base and configured to accommodate a part of the leg,
a placement area forming part configured to form a placement area for the sealant together with the body and the leg of the terminal and the terminal groove and the through hole of the base, the placement area extending from the outside of the housing toward the closed space through an interval between the through hole and the leg and an interval between the terminal groove and the body, and
the placement area forming part includes a recess disposed at a bottom of the terminal groove and in a vicinity of the through hole.

2. The seal structure according to claim 1 , wherein
the body of the terminal has an elastically deformable plate shape, and includes a spring fulcrum located in the terminal groove and extending in a direction parallel to the plate surface and orthogonal to the connection end face of the base, and
the placement area forming part is disposed closer to the base than the spring fulcrum in the direction intersecting with the connection end face of the base.

3. The seal structure according to claim 1 , wherein
a distance between the terminal and the base in the placement area for the sealant is less than 0.2 mm, and
a distance between the terminal and the base in the placement area forming part is equal to or more than 0.2 mm.

4. The seal structure according to claim 1 , wherein
at least one of the terminals includes a sealant placement part extending from the body in the direction intersecting with the connection end face of the base and disposed in parallel with the leg, the sealant placement part having a length, from the body in the direction intersecting with the connection end face of the base, smaller than a length of the leg, and
the base includes
a terminal groove that opens to the closed space and in which the body is accommodated,
a first through hole extending from the terminal groove in the direction intersecting with the connection end face of the base and configured to accommodate a part of the leg, and
a second through hole extending from the terminal groove in the direction intersecting with the connection end face of the base and extending in parallel with the extending direction of the first through hole, the second through hole being configured to accommodate the sealant placement part so that the sealant placement part does not project from the connection end face of the base.

5. An electronic device comprising
the seal structure according to claim 1 .

6. The electronic device according to claim 5 , wherein the electronic device is an electromagnetic relay.

7. A method for manufacturing an electronic device that includes
a housing having a base having a connection end face and a case in a box shape covering one end opening surface in a direction intersecting with the connection end face of the base, the housing having on an inside a closed space enclosed by the base and the case, with a sealant sealing a joint portion of the base and the case, and
at least one of terminals having a body disposed in the closed space and fixed to the base along the direction intersecting with the connection end face of the base, and a leg extending from the body to an outside of the housing through the base in the direction intersecting with the connection end face of the base,
wherein the base includes
a terminal groove opened to the closed space and configured to accommodate the body,
a through hole extending from the terminal groove in the direction intersecting with the connection end face of the base and configured to accommodate a part of the leg, and
a sealant restriction part provided in an inflow path extending from the outside of the housing toward the closed space through an interval between the through hole and the leg and an interval between the terminal groove and the body,
the sealant restriction part includes a recess disposed at a bottom of the terminal groove and in a vicinity of the through hole, and
after attachment of the case from the one end opening surface side of the base assembled with the at least one of the terminals, an electromagnet, and a movable part, the electronic device is fixed in a state where the sealant flows from the connection end face side of the base toward the closed space, to fill a joint portion between the base and the case with the sealant, and the sealant restriction part restricts an inflow range of the sealant passing through the inflow path.

Assignees

• Omron Tateisi Electronics Co

Inventors

• Kitagawa Tatsuro
• Fukui Norio
• Kido Ryoichi
• Kawaguchi Naoki

Classifications

• H01H50/023 Primary

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

• H01H50/642

  intermediate part being generally a slide plate, e.g. a card · CPC title

• H01H49/00

  Apparatus or processes specially adapted to the manufacture of relays or parts thereof · CPC title