Key switch device

Patent metadata

Field	Value
Publication number	US-11189441-B2
Application number	US-201716306055-A
Country	US
Kind code	B2
Filing date	Apr 13, 2017
Priority date	Jun 2, 2016
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

A key switch device includes a base, a button mounted on the base so as to be contactable and separable, an elastic body disposed between the base and the button and configured to urge the button in a direction away from the base, and a linear reinforcement member provided on the button and configured to prevent the button from being inclined when the button is operated in a direction toward the base. An outer surface portion of the button includes a recessed support portion in which a part of the linear reinforcement members is disposed.

First claim

The invention claimed is:

1. A key switch device, comprising:
a base;
a button mounted on the base that is contactable and separable;
an elastic body disposed between the base and the button that urges the button in a direction away from the base; and
a linear reinforcement member provided on the button that prevents the button from being inclined when the button is operated in a direction toward the base, wherein
the button includes a flat plate portion having a rectangular shape in plan view, a first elongated portion, and a second elongated portion, the first elongated portion and the second elongated portion extend from two opposing sides of the flat plate portion in opposing directions,
an outer surface portion of the first elongated portion comprises a first recessed support portion configured to support the linear reinforcement member,
an outer surface portion of the second elongated portion comprises a second recessed support portion configured to support the linear reinforcement member,
each of the first and the second recessed support portions comprises a side edge of the flat plate portion and a plurality of projections, each projection including a recessed arcuate surface that supports the linear reinforcement member, wherein the recessed arcuate surface further comprises a groove portion,
the first recessed support portion has a larger number of projections than the second recessed support portion, and
a part of the linear reinforcement member is disposed in any of the first and the second recessed support portion.

2. The key switch device according to claim 1 , wherein the button and the linear reinforcement member are covered with a key cap.

3. The key switch device according to claim 2 , wherein
the key cap has a rectangular shape in plan view, and
a part along a longitudinal direction of the linear reinforcement member supported by the support portion of the button is disposed along a long side of the key cap.

4. The key switch device according to claim 1 , wherein the support portion is provided at an edge portion of a top outer surface portion of the button.

5. The key switch device according to claim 2 , wherein the support portion is provided at an edge portion of a top outer surface portion of the button.

6. The key switch device according to claim 3 , wherein the support portion is provided at an edge portion of a top outer surface portion of the button.

7. The key switch device according to claim 1 further comprising a cylindrical spring guide portion formed at a central portion of a lower surface of the button.

8. The key switch device according to claim 1 , wherein the first recessed support portions have three projections and the second recessed support portions have two projections.

Assignees

• Omron Tateisi Electronics Co

Inventors

• Izawa Kazuhira
• Naka Mamiko
• Nagata Kenshi
• Fujino Hiroaki

Classifications

• H01H2235/01

  Spiral spring · CPC title

• H01H13/52

  the contact returning to its original state immediately upon removal of operating force, e.g. bell-push switch · CPC title

• H01H13/14 Primary

  Operating parts, e.g. push-button · CPC title

• H01H13/702

  with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches · CPC title

• H01H3/125

  using a scissor mechanism as stabiliser · CPC title