| 摘要 |
A loudspeaker design for use in transmitting and receiving sound waves is disclosed. The loudspeaker consists of a basket (12) and magnet assembly (14). The magnet assembly consists of a sandwich of front (16) and back (20) plates on either side of a ring-shaped ceramic magnet (18). The back plate (20) has a pole piece (22) projecting outward therefrom. The ceramic magnet (18) has a center aperture. The magnet (18) is affixed to back plate (20) concentrically around the projecting pole (22). The front plate (16) is circular in shape and also has a center aperture (31). A centering device and shield (24) is placed concentrically around the projecting pole (22) and is adjacent to the inside surface of the back plate (20), the inner surface of the aperture (30) within the ceramic magnet (18), and the inner surface of front plate (16) when it is affixed to the ceramic magnet, thereby creating the above-mentioned sandwich. The front plate (16) has a lip (34) on its outer surface and a recess (42) in its inner surface. Lip (34) has an outer diameter (38) slightly less than that of the center hole in the speaker basket (12). The speaker basket is attached to the magnet assembly by placing lip (34) within the hole in the speaker basket and staking the two together. The inner recess (42) of the front plate (16) is designed to accept the vertical wall of the magnet centering device and shield (24) so as to prevent the entry of particles of magnet and other foreign materials into the air gap (46) in which the speaker voice coil must move.
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