Motor driving apparatus

A lens-barrel driving apparatus for a camera, comprising:

• a lens-barrel provided with a plurality of mechanisms for photographing by the camera, which are selected from shutter, diaphragm, auto focusing, and zooming mechanisms;
• a plurality of motors that are integrated in order to drive the plurality of the mechanisms;
• a driving circuit for driving a plurality of loads contained in the plurality of the motors;
• and
• a control circuit for controlling the driving circuit to sequentially drive the plurality of the motors, wherein:
• the driving circuit is provided with at least n+1 number of output terminals in order to connect thereto n (n:
• integer 2 or larger) number of loads, each of the output terminals being led out from a node of a PNP type transistor and an NPN type transistor connected in series through the node in such a configuration that each pair of the output terminals adjacent to one another constitute a bridge circuit assigned to drive one load;
• the control circuit turns on and off the PNP and NPN type transistors of the bridge circuit to thereby energize the load in either of a normal direction and a reverse direction;
• a particular one of the output terminals is led from a node of a particular PNP type transistor and a particular NPN transistor, one of which is driven by a constant electric current through a feedback loop and the other of which is driven by a constant electric current through an open loop;
• and
• the particular output terminal and another output terminal adjacent thereto are paired to constitute a particular bridge circuit for driving a particular load by the constant electric current through either of the feedback loop and the open loop properly depending on whether the particular load is energized in the normal direction or the reverse direction.