Loudspeaker having improved magnetic assembly

Details Loudspeaker having improved magnetic assembly Loudspeaker having improved magnetic assembly

1979-01-29

1981-03-17

Brown, Thomas W.

1791155H, 1791155PC, 179119R, H04R 1102

Patent

active

042569303

ABSTRACT:
In a moving coil loudspeaker of the type including a pair of co-axial speech coils, one driving a cone and the other a high-frequency diaphragm at the rear of the loudspeaker, the speech coils operating in respective annular air gaps in series with one another and formed in a magnetic assembly comprising an outer ring magnet, a pair of annular magnetic plates fitted at the ends of the ring magnet and a central magnetic pole piece formed with an axial passage defining a horn for the acoustic output of the diaphragm and extending into the openings in the annular plates to define the two air gaps, the central pole piece is formed with an encircling flange forward of its rear end which is secured to the rear annular plate by way of a non-magnetic member to constitute the sole fixing for the pole piece.

REFERENCES:
patent: 2581223 (1952-01-01), Voigt

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