VIBRATING-TYPE MOTOR
A vibrating-type motor is provided, in which only a restoring force is reduced without reducing a thrust increasing effect by auxiliary magnets, thereby reducing size while increasing efficiency. Specifically, a vibrating-type motor is provided that includes a moving part having a main magnet and auxiliary magnets individually junctioned coaxially to axial end portions of the main magnet at junction locations, an exciting yoke including two leg portions opposed to the moving part through a gap, and arranged with respect to the moving part such that a first distance between central portions of faces of the two leg portions that are closest to the moving part is different from a second distance between the junction locations, an exciting coil wound on the exciting yoke for generating a magnetic flux in the leg portions, and a back yoke arranged to confront the exciting yoke with the moving part located between the back yoke and the exciting yoke, wherein the axial end portions of the moving part are substantially coincident with outer-side end portions of the faces of the leg portions.
1 . A vibrating-type motor comprising:
a moving part including a main magnet and auxiliary magnets individually junctioned coaxially to axial end portions of the main magnet at junction locations;
an exciting yoke including two leg portions opposed to the moving part through a gap, and arranged with respect to the moving part such that a first distance between central portions of faces of the two leg portions that are closest to the moving part is different from a second distance between the junction locations;
an exciting coil wound on the exciting yoke for generating a magnetic flux in the leg portions; and
a back yoke arranged to confront the exciting yoke with the moving part located between the back yoke and the exciting yoke;
wherein the axial end portions of the moving part are substantially coincident with outer-side end portions of the faces of the leg portions.
2 . A vibrating-type motor according to claim 1 , wherein said exciting yoke is disposed on the radially outer side of said moving part, and wherein said back yoke is disposed on the radially inner side of said moving part.
3 . A vibrating-type motor according to claim 1 , wherein said exciting yoke is disposed on the radially inner side of said moving part, and wherein said back yoke is disposed on the radially outer side of said moving part.
4 . A vibrating-type motor according to claim 1 , wherein the second distance is larger than the first distance.
5 . A vibrating-type motor according to claim 1 , wherein an axial length of the moving part is larger than the first distance.