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

Abstract

The present invention provides a structure of a movable contact that can have a good knock feeling even when it is used for a flat circuit board, and will not cause a badly restored movable contact after being turned over. The contact structure consists of a disk portion in which the center of the thin metal plate is bulged in one direction into a dome shape, and has a predetermined angle from the outer peripheral portion of the disk portion to the center portion of the disk portion. The side edge portion 1a is connected to the side edge portion 1a and the dome portion 1b which can be turned over repeatedly is connected, and the middle of the connection portion between the side edge portion 1a and the dome portion 1b is formed into a multi-step shape through a plurality of bending portions 1c and 1d.

Description

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

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 flipped state and cannot be restored by itself.

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