Abstract: A key switch structure used in an input device is disclosed to include a circuit module, a key cap supported on a vertically compressible and elastically deformable hollow actuation member of a rubber membrane of the circuit board, a positioning board fastened to the circuit module, and two links arranged in a crossed manner and coupled between coupling portions of the positioning and the key cap to guide vertical movement of the key cap by means of a scissor action when the key cap is pressed by a user to compress the vertically compressible and elastically deformable hollow actuation member in triggering a circuit module to produce a control signal.

Abstract: A key switch structure used in an input device is disclosed to include a circuit module, a key cap supported on a vertically compressible and elastically deformable hollow actuation member of a rubber membrane of the circuit board, a positioning board fastened to the circuit module, and two links arranged in a crossed manner and coupled between coupling portions of the positioning and the key cap to guide vertical movement of the key cap by means of a scissor action when the key cap is pressed by a user to compress the vertically compressible and elastically deformable hollow actuation member in triggering a circuit module to produce a control signal.

Abstract: A keyboard structure includes a circuit board prepared from a flexible light guide material and carrying a circuit layout, multiple key switch modules for operation by a user to cause the circuit board to produce a respective electrical signal, and multiple luminous units installed in a flexible light guide substrate of the circuit board and electrically connected with the circuit layout for emitting light to illuminate press heads of the key switch modules.

Abstract: A backlight unit for enhancing brightness of a TFT-LCD device is disclosed. The backlight unit comprises a lamp and a light guide plate. The light guide plate has a top surface and one side. And the lamp is fastened to the side of the light guide plate for illumination. The light is multiple reflected in the light guide plate and emitted from the top surface of the light guide plate. The backlight unit further comprises an optical film and an adhesive layer, wherein the optical film is disposed on the light guide plate to spread the light uniformly, and the adhesive layer is applied to fill gaps between the light guide plate and the optical film. The adhesive layer has a refractive index equal to that of the light guide plate and the optical film for decreasing multiple reflections therebetween.

Abstract: Disclosed is an automatic power regulator for controlling an induction type biogas generator via an electrically controlled governor. The biogas generator is directly coupled with a commercial AC power network. The regulator controls the power output of the generator to follow the power consumption of a load according to the difference between the power output and the power consumption. Positive and negative references are set to avoid oscillation of the system.