Patent ID: 8354629

Claim:
A computer keyboard comprising: a plurality of optical sensors mounted under a top surface of the computer keyboard; and a plurality of units each comprising: an optically transmissive key member; a scissors-shaped structure having a top secured to the key member; a light guide diaphragm disposed under the scissors-shaped structure; an insulating diaphragm disposed under the light guide diaphragm and including a light source on a top surface, a positive conductor electrically connected to a positive terminal of the light source and disposed on the top surface, a negative conductor electrically connected to a negative terminal of the light source and disposed on a bottom surface, and a bus having one end electrically interconnecting the positive conductor and the negative conductor, and the other end electrically connected to a corresponding optical sensor; a film circuit board disposed under the insulating diaphragm and including a holed rubber dome with the key member positioned therein; and a base board including a plurality of anchoring members, wherein the scissors-shaped structure passes the light guide diaphragm, the insulating diaphragm, and the film circuit board to have bottom retained by the anchoring members of the base board; wherein the optical sensors are activated to send electrical signals to each corresponding light source via the buses when light condition of the environment is below a predetermined level, and the light sources are activated to emit light for uniformly illuminating the key members by cooperating with the corresponding light guide diaphragms; and wherein brightness of the light emitted by the light source is adjusted in response to light condition of the environment as sensed by the optical sensor.