Patent ID: 6665416
Filing Date: 2003-12-16
Classification: B06B,H02K,H04R

Abstract:
A speaker with a built-in direct current (DC) motor embedded therein for selectively generating sound and vibration, the speaker comprising:a speaker part including; a yoke having a hole formed at the center of the bottom thereof, a first ring-shaped magnet mounted on the top surface of a peripheral portion of said yoke in such a manner as to be positioned coaxially with the center axis of said yoke, a ring-shaped upper plate mounted on the top surface of said first magnet in such a manner as to be positioned coaxially with the center axis of said yoke, and adapted to form a magnetic gap between a bent portion of said yoke and said upper plate to thereby constitute a magnetic circuit for generating magnetic flux together with the yoke and the first ring-shaped magnet, a vibration plate attached to the top surface of said upper plate at the circumferential end thereof in such a manner as to be positioned coaxially with the center axis of said yoke, and a cylindrical voice coil attached to the bottom surface of said vibration plate and inserted into said magnetic gap, a direct current motor part including; a lower plate fixedly attached to the bottom surface of said peripheral portion of said yoke, a flexible printed circuit board disposed on said lower plate, having a hole formed at the center thereof and a brush transmitting a driving signal, a second ring-shaped magnet mounted on the top surface of said lower plate in such a manner as to be positioned coaxially with the center axis of said yoke, a rotary shaft one end of which is fitted into said hole of said yoke and the other end of which is fitted into said hole of the center of said flexible printed circuit board, and an eccentric rotor rotatably mounted on said rotary shaft and adapted to rotate in response to the driving signal generated from said brush; and a frame adapted to support said speaker part and said direct current motor part.