Dome shaped contact plate having good knocking sense and thin sheet installed with contact plate

Abstract

A movable contact structure which, even when used in a planar circuit board, can provide a crispy click feeling and will not fail to return to an original position after being inverted is to be provided. The structure consists of a disc formed into a dome shape by cupping a center of a thin metallic sheet in one direction, provided with a skirt 1a rising at a prescribed angle from an outer circumference of this disc toward a center of the disc, and a dome 1b which is continuous from this skirt 1a and can be repetitively inverted, the connecting part between the skirt 1a and the dome 1b being formed in multiple steps via a plurality of bent portions 1c, 1d.

Description

Technical field [0001] The present invention relates to a contact plate used as a movable contact of a push button switch, and particularly relates to a contact plate punched into a dome-shaped disc shape, a sheet equipped with the contact plate, and a switch device using the same. Background technique [0002] In the prior art, the structure of the contact plate as the movable contact of the button switch, such as Figure 8 to Figure 12 The structure shown is well known. Figure 8 to Figure 10 Is a cross-sectional view showing the relationship between the movable contact and the fixed contact, Picture 11 with Picture 12 It is an explanatory diagram showing the relationship between the operating force of the movable contact and the amount of movement. [0003] Figure 8 It shows the state in which a thin metal plate bulges outward to form a dome-shaped disk-shaped movable contact 51, and is placed on the central fixed contact 53 and the peripheral fixed contact 54. The central...

AI Technical Summary

Problems solved by technology

[0009] However, when the structure of the movable contact 51 of the above-mentioned prior art is used for a flat circuit board 55 or the like, when the dome portion 51b of the movable contact 51 is reversed, the contact portion 51 and the contact portion 51 are separated from each other. The distance (move amount) L2 of the central fixed contact 56 is smaller than L1, so as Figure 11 As shown in B in , when the movable contact 51 is turned over, the amount of movement after turning over is small, so there is a problem that the knocking feeling deteriorates.

[0010] Furthermore, when the rising angle θc of the side edge portion 58a is increased, as Figure 12 As shown, the minimum point LC of the reaction force of the sensory curve CO of the movable contact 58 becomes negative, therefore, there is a problem that the movable contact 58 remains in the inverted state and cannot be restored by itself.

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