Abstract: A holding device includes a base including a first protrusion and a second protrusion with a receiving space defined between the two protrusions. The first protrusion has a hole defined in an inside thereof and a clamping member is eccentrically received in the first protrusion so that a friction portion of the clamping member is movably extended through the hole and protrudes into the receiving space. A shank of a tool is received in the receiving space and clamped by the clamping member and a friction plate on the second protrusion. A cover is received in the first protrusion from an open rear end of the base so as to prevent foreign objects from entering the first protrusion.

Abstract: A contact image sensor for use in a fax machine or scanner, including a driver, at least one sensor chip, an analog switch, a capacitor, an operational amplifier, a uni-power supply, a voltage converter, and a voltage converter. In an alternate form of the present invention, the operational amplifier and the voltage converter are omitted.