KEYPAD SYSTEM

摘要

A key telephone has a number of dial keys and various function keys. A device is useful for improving the display status by modifying the appearance and the size of the acrylic part in the double injection key tops. The lower surface of a key top passes the large amount light of LED. The upper surface minimizes the refractive index of LED light. The front surface is flat and vertical with the lower and upper surfaces. The rear surface is inclined in a predetermined degree and provides the strong light to the front surface.