Patent ID: 6621188
Filing Date: 2003-09-16
Classification: H02K

Abstract:
A flat type vibration motor comprising:a lower case; an upper case which covers an upper portion of said lower case; a shaft which connects the center of said lower case with the center of said upper case and supports them; a magnet having at least two poles and attached to an upper portion of said lower case; an upper substrate rotatably and eccentrically supported on said shaft and having a commutator provided with a plurality of segments on the circumference of the center of said shaft at a bottom of said substrate; a pair of brushes in contact with said commutator to be electri-cally connected with said commutator; at least two winding coils arranged separated from each other at a predetermined angle on said upper substrate; a weight arranged between said winding coils on said upper substrate; and a rotor integrally formed by insert injection with a general resin and said upper substrate having said winding coils and said weight fixed thereon, wherein a portion filled with said resin on the circumference of said weight between said winding coils coincides with the circumference of said upper substrate.