keyboard

Abstract

The present invention discloses a keyboard includes a plural of keys, a base plate, and a membrane circuit. The membrane circuit includes a first plate, a second plate, a third plate, and a forth plate, and the first plate has a plural of first conductive pads. The second plate includes a plural of second conductive pads and a plural of first openings. The third plate includes a plural of third conductive pads and a plural of second openings, and the forth plate has a plural of forth conductive pads. Therefore, a first key matrix is formed by the plural of first conductive pads, the plural of first openings and the plural of third conductive pads, and a second key matrix is formed by the plural of second conductive pads, the plural of second openings and the plural of forth conductive pads.

Description

technical field [0001] The invention relates to a keyboard, in particular to a keyboard including a membrane switch circuit. Background technique [0002] Common computer peripheral input devices include a mouse, a keyboard, and a trackball. The keyboard can directly input text and symbols to the computer, so it is highly valued by users and input device manufacturers. Among them, the more common one is a keyboard that includes a scissor-type connecting element. [0003] Next, the architecture of the keyboard including the scissor connection elements is described. see figure 1 , which is a structural cross-sectional schematic diagram of an existing keyboard. The existing keyboard 1 includes a plurality of keys 10 , a membrane switch circuit 11 and a support plate 12 , and each key 10 includes a key cap 101 , a scissor-type connection element 102 and an elastic element 103 . In the key 10, the key cap 101 is exposed outside the existing keyboard 1 and can be touched by th...

AI Technical Summary

Problems solved by technology

However, the method of arranging a diode near each key contact has the following disadvantages: first, the cost of the diode is high, and this method will lead to an increase in the cost of the keyboard

Second, arranging multiple diodes on the membrane switch circuit will increase the thickness of the membrane switch circuit, which is not conducive to the thinning of the keyboard

Third, in this method, diodes must be welded near each button contact, and the process is too complicated

This approach will result in an excessive number of output lines that are difficult to configure

For example: the keyboard contains 144 keys, this method will have 144 output lines, so it is difficult for the manufacturer to arrange a large number of output circuit configurations

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