Abstract: An optical navigation system having an optical navigation integrated circuit (“navigation IC”) is described. The optical navigation system may include an emitter module and a pixel array surrounding the emitter module. The optical navigation system may further include a ring optical system located on the surface of the navigation IC over the pixel array.

Abstract: A drawer type cursor controller for portable computers mainly includes a drawer-like casing received in a lower part housing of a portable computer below a keyboard thereof for accommodating a track ball therein. The drawer-like casing for the track ball is slidably supported to be conveniently pushed into the lower part housing of the portable computer when the track ball is not in use, and is conveniently pulled out of the lower part housing of the portable computer when the track ball is to be manipulated. The drawer-like casing track ball is disposable at a pulled out position that permits an operator to use either right or left thumb to smoothly move the track ball in an ergonomically suitable position without hindering operation on the keyboard with other fingers.

Abstract: A shaft assembly for connecting the screen cover of a portable computer to the computer body and permitting permits the cover to be pivoted and maintained at a desired angle of use. The assembly includes a hollow shaft provided with an expandable conical claw which is frictionally engaged within a rotatable positioning ring on which the screen cover is mounted, so that pivoting of the cover will cause the ring to rotate relative to the hollow shaft and be frictionally maintained in a given angle of rotation relative to the hollow shaft.