Abstract: A peripheral powered document scanning device includes a frame, contact image sensor ("CIS") module, a drive platen, document drive platen bearings, springs, a non-enveloping worm drive assembly, a printed circuit board, and a document sensor. The frame comprises rigid members that include an upper frame member, a lower frame member, and right and left endplate members. The four-piece frame is configured so that the upper frame member and the lower frame member are opposite to each other and each is connected at their right and left ends to the right endplate member and the left endplate member, respectively. Each endplate member includes a longitudinal slot where the drive platen rests on the springs so that the drive platen moves in a longitudinal direction with respect to the frame. The CIS module is secured to the upper frame member and remains fixed with respect to the frame.

Abstract: An improved track ball which can be conveniently manipulated with a single hand is disclosed. The track ball protrudes through a circular opening in a housing, with the top edge of the housing having a rounded switch. The switch can thus be manipulated with the fingers while the palm or thumb of the hand is manipulating the track ball. The housing is mounted at an angle to the side of a computer keyboard, providing for easy access. The track ball housing can be rotated to any continuous angle through two angles of rotation by the user. A tetrahedron support arrangement holds the ball in place at any angle. The same housing can be used for either the right or left sides of a keyboard by simply switching the activating point on the switch. An encoder wheel is attached by a shaft to the ball and has a number of slots extending from its center to its edge. The slots are rectangular in shape, and do not have edges along radial lines as in the prior art encoder wheels.

Abstract: The present invention provides a hand held scanner with a motorized drive capability. The motorized drive employs a clutchless motor system. In manual operation, the scanner operates as a standard non-motorized scanner in which the user can neither see nor feel any effects of the motor system. In the motorized mode, a worm gear mounted on the motor's drive shaft causes the drive gear/friction wheel assembly to engage the drive rollers.

Abstract: A hand scanner employs either uniformly or variably frosted scan windows to control illumination. For scanning color documents including books and magazines, a hand scanner employs a fluorescent tube mounted a certain distance above the lower surface of the scanner housing. At the fluorescent tube ends, corresponding to the illumination "dead space" of the fluorescent tube, the underlying portion of the scanner housing is recessed towards the tube.