Claims
- 1. In an electroacoustical transducer having an annular permanent magnet with a center aperture, a pole piece positioned in the aperture, a voice coil surrounding the pole piece, a diaphragm operatively connected to the pole piece, a front flux plate with a center aperture aligned with the aperture of the magnet, a back flux plate attached to the pole piece, the improvement comprising:
- at least one of said flux plates having opposite parallel faces, one of which is completely flush with the annular magnet and said one flux plate having eight sides substantially perpendicular to and between the faces, each side having an inner edge abutting the annular magnet, an outer edge substantially parallel to the inner edge, and two edges in common with adjacent sides; and
- the inner face edges of the one flux plate being contained within the area bouned by the outer diameter of the annular magnet.
- 2. An electroacoustical transducer as described in claim 1 wherein:
- the inner face edges of the one flux plate define an area of substantially 83 percent of the surface area defined by the outer diameter of the annular magnet.
- 3. An electroacoustical transducer as described in claim 1 wherein both flux plates have eight sides and have their inner edges contained within the area bounded by the outer diameter of the annular magnet.
- 4. An electroacoustical transducer as described in claim 3 wherein said eight sides define a regular octagon.
- 5. An electroacoustical transducer as described in claim 1 wherein said eight sides define a regular octagon.
- 6. An electroacoustical transducer as described in claim 2 wherein said eight sides define a regular octagon.
Parent Case Info
This is a continuation of application Ser. No. 718,178, filed Aug. 27, 1976 now U.S. Pat. No. 4,158,756.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4035591 |
Carbonneau |
Jul 1977 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2247 |
Jan 1976 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
718178 |
Aug 1976 |
|