A peripheral key

Abstract

The utility model provides a kind of peripheral key, including shell, the shaft body and elastic member of lower end through the top of shell and extend to the inside of shell;When elastic member is extruded by shaft body, upward force is applied to shaft body, further include the light distance sensor of being arranged in the bottom of shell inner chamber and the reflective film piece fixed to the lower end of shaft body;Light distance sensor includes substrate, the LED module of being arranged on substrate, several PD module of being arranged in the periphery of LED module and the processor module of receiving PD module photoelectric current signal, reflective film piece is located above PD module and LED module.Peripheral key is through in LED module, the PD module of being arranged in the periphery of LED module, combine the reflective film piece of bottom in the process of shaft body pressing down, utilize how much reflective film piece reflects light to determine whether key triggers, and the requirement of light path alignment is low;PD module and LED module are integrated on substrate, and light distance sensor structure is compact, applicable to the inside of key of small space.

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