Key switch and movable contact member

Abstract

The invention provides a key switch and a movable contact member having advantages of good touch feeling and good electric conduction stability. The key switch 1 comprises a housing 30, which is provided with an accommodation part 31; a first fixed contact part 21, which is exposed from the accommodation bottom surface 31a of the accommodation part; and the movable contact member 10, which is provided with a dome part 10 protruded in the shape of a dome, and is disposed on the accommodation part, and can be separated from the contact with the first fixed contact part along with the reverse rotation motion of the dome part. The movable contact member is provided with a contact part 10f, which is protruded toward the inner side of the dome part from the periphery of the top part of the dome part, and is in the shape of a suspension arm tongue piece. At least one of a contact part and the first fixed contact part is provided with a first protrusion part 11 protruded toward the other side, and by using the first protrusion part, the electric conduction between the movable contact member and the first fixed contact part is started.

Description

technical field [0001] The present invention relates to a key switch and a movable contact member capable of electrically contacting and separating according to the reverse movement of the dome portion. Background technique [0002] In switchgears used in electrical equipment, pushbutton switches are required to perform reliable switching operations and have clear operating tactile sensations. For example, Patent Document 1 discloses a switch device in which an electrical switching operation is performed by pressing a movable contact member so that the movable contact member comes into contact with a fixed contact portion, and the movable contact member performs an inversion operation. And produce operation touch. [0003] Figure 18 It is a schematic sectional view showing the structure of the switch device 100 of patent document 1. Figure 19 It is a schematic diagram showing the appearance of the movable contact member 101 . Figure 20 It is a plan view showing a modif...

AI Technical Summary

Problems solved by technology

[0008] However, according to Figure 19 As shown in the connecting portion 101e, the protruding size is small, and it is difficult to further increase the operation stroke.

On the other hand, if Figure 20 The sliced ​​arm portion 101f as shown has a simple plate shape, so the operation stroke can be further increased. However, when it comes into contact with the fixed contact, the front end portion of the arm portion 101f comes into contact first. There are concerns about the stability of electrical conduction due to poor conduction due to corrosion of the cross section.

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