Patent ID: 6844643

Claim:
A driving device comprising: a first motor unit comprising: (a) a first magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along a circumferential direction; (b) a first rotary member rotating together with said first magnet; and (c) a first stator member having a plurality of outer magnetic poles that are arranged on the outer periphery of said first magnet and an inner magnetic pole that is arranged on the inner periphery of said first magnet and is opposed to said outer magnetic poles, said first stator member being excited by a first coil; a second motor unit comprising: (d) a second magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along a circumferential direction; (e) a second rotary member rotating together with said second magnet; and (f) a second stator member having a plurality of outer magnetic poles that are arranged on the outer periphery of said second magnet and an inner magnetic pole that is arranged on the inner periphery of said second magnet and is opposed to said outer magnetic poles, said second stator member being excited by a second coil; and a driven member meshed with said first rotary member and said second rotary member, wherein electric power having different phases are supplied to said first and second coils to rotate said first rotary member and said second rotary member, which then drive said driven member.