Patent ID: 7810961
Filing Date: 2010-10-12
Classification: F21Y,G02B,H01H,H04M

Abstract:
1. A keyboard construction for an electronic appliance comprising a plurality of keys and an energy-saving light-emitting module, comprising: the energy-saving light-emitting module disposed under the plurality of keys and having: a light guide plate having a light-incident surface, a bottom surface intersecting the light-incident surface and a light-emitting surface opposite the bottom surface, wherein a plurality of recesses are provided at the bottom surface; a light source placed at one side of the light-incident surface of the light guide plate; and a reflective plate placed at the bottom of the light guide plate for reflecting light rays from the light source into the light guide plate; wherein the recesses of the light guide plate are arranged in a rising manner like stairs, and the recess nearest the light source has a lower height and the recess farthest from the light source has a greater height.