Optical switch button

Abstract

The invention relates to an optical switch key, comprising a key cap, a support mechanism and a switch module. The support mechanism is arranged under the keycap to support the keycap to move up and down. The support mechanism includes a second bracket and a first bracket pivotally connected to the inner side of the second bracket. The second bracket has a protruding portion from the second bracket toward the direction away from the keycap. The extension protrudes; the switch module includes a circuit board, a light transmitter and a light receiver electrically connected to the circuit board and located outside the vertical projection area of ​​the first bracket, and the light transmitter emits light signals corresponding to the light receiver. When the keycap is not pressed, the light signal received by the light receiver is the first intensity; when the keycap is pressed, the keycap drives the protrusion to move, so that the protrusion changes the light signal received by the light receiver to the second intensity, And the second intensity is different from the first intensity, so as to trigger the switch module to generate the trigger signal. The present invention achieves fast and accurate conversion of the pressing signal by changing the receiving state of the optical signal along with the pressing stroke of the protruding portion of the supporting mechanism.

Description

technical field [0001] The invention relates to an optical switch key, in particular to an optical switch key which is pressed to change the receiving state of an optical signal to actuate a switch. Background technique [0002] Membrane switch keys and mechanical keys are commonly used key types in conventional keyboards. The main difference between the membrane switch button and the mechanical button is that the circuit structure that generates the signal is different. Generally speaking, a membrane switch key is a switch element that uses a thin film circuit layer as a signal generator. When the keycap is pressed to trigger the thin film circuit layer, the upper circuit layer is deformed so that the switch contacts of the upper circuit layer contact the corresponding switch contacts of the lower circuit layer. Then the membrane switch is turned on to generate a signal. However, the thin-film circuit layer is easily damaged after frequent use or under the condition of im...

AI Technical Summary

Problems solved by technology

However, metal sheets and metal contacts are prone to wear and tear due to impact, which affects the service life of the buttons, and also causes metal sheets or metal contacts to rust due to moisture, resulting in poor conduction and affecting the stability of the buttons.

Furthermore, conventional mechanical buttons are generally not suitable for portable electronic devices that require high thinness, such as notebook computers, due to their complex structure and large volume.

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