Magnetic circuit system
View Patent ↗A magnetic circuit system includes a T-shaped yoke, a magnet, and a top plate. The top plate has a center hole, an internal end around the center hole thereof, and two projecting elements provided separately on upper surface and lower surface of the internal end, which improves non-linear distortion of a transducer using the magnetic circuit system.
1. A magnetic circuit system, comprising:
a yoke having a lower plate and a center pole projecting from a central part of the lower plate;
a magnet having a through hole, and coupled to the lower plate of the magnet with the through hole around the centre pole;
a top plate attached to the magnet, and having a centre aperture around the central pole of the yoke;
a magnetic gap defined between an inner surface of the top plate and an outer surface of the centre pole of the yoke; wherein
the top plate has a portion close to the central pole of the yoke having a thickness greater than that of the remaining portion.
2. The magnetic circuit system as describe in claim 1 , wherein the top plate defines a projecting element uprightly protruding from a portion close to the central pole of the yoke.
3. The magnetic circuit system as describe in claim 2 , wherein a cross section of the projecting element is a triangle.
4. The magnetic circuit system as describe in claim 3 , wherein the triangle has a first side parallel to the central pole of the yoke and a second side connecting the first side to a top surface of the top plate, the second side forming an angle relative to the top surface.
5. The magnetic circuit system as describe in claim 4 , wherein the angle is between 20˜70 degrees.
6. The magnetic circuit system as describe in claim 2 , wherein the portion where the projecting element protrudes from is farther from the central pole than the most inner side of the top plate.
7. A transducer having a magnetic circuit system, the magnetic circuit system comprising:
a yoke having a lower plate and a center pole projecting from a central part of the lower plate;
a magnet having a through hole, and coupled to the lower plate of the magnet with the through hole around the centre pole;
a top plate attached to the magnet, and having a centre aperture around the central pole of the yoke;
a magnetic gap defined between an inner surface of the top plate and an outer surface of the centre pole of the yoke; wherein
the top plate has a portion close to the central pole of the yoke having a thickness greater than that of the remaining portion.