Line radiator ribbon loudspeaker

An elongate sound-producing strip-shaped transducer of narrow width which is narrow enough in a transverse direction to produce wide dispersion of sound in a side to side direction and which is long enough to minimize dispersion in the other direction and to respond to an audio frequency input current, comprising

• a pair of stationary elongate strip-shaped magnets of narrow width and lying along and in spaced relation with each other, the magnets having sides defining pole faces of opposite polarity confronting each other across the elongate space therebetween, whereby to establish intense magnetic fields in and adjacent the elongate space, the elongate magnets extending longitudinally of the elongate transducer and the length of the magnets being manyfold times the cumulative width of the elongate magnets and the space therebetween,
• a continuous ribbon-like current-carrying conductor extending longitudinally all along the elongate space in the intense magnetic field to the ends of the transducers and lying normal to the pole faces, the ribbon-like conductor having substantially the same length as the magnets,
• means mounting the conductor to permit oscillation of the conductor under the combined influence of the intense magnetic field and the audio frequency input current in the conductor,
• and an armature of magnetic material extending along the length of the magnets and transversely thereof to provide a low reluctance flux path therebetween for intensifying the magnetic fields in the spaces.

An elongate, sound producing line radiator type transducer which is narrow enough in a transverse direction to produce wide dispersion of sound in a side to side direction and which is long enough to minimize dispersion considerations in the other direction and to respond to an audio frequency input current comprising

• a multiplicity of stationary elongate strip-shaped magnets and a multiplicity of elongate ribbon-like current carrying conductors, the magnets and conductors extending all along each other and continuously to the ends of the transducer,
• the magnets lying along and in spaced relation with each other, the magnets having obverse and reverse sides confronting each other across the elongate spaces between adjacent magnets, the obverse and reverse side of the magnets adjacent each elongate space defining magnetic pole faces of opposite polarity whereby to establish intense magnetic fields in and adjacent the elongate spaces, and
• the ribbon-like conductors extending along the elongate spaces in the intense magnetic fields and lying normal to the pole faces,
• means mounting the conductors to permit oscillation of the conductors under the combined influence of the intense magnetic field and the audio frequency input current in the conductors, and
• an armature of magnetic material extending along the length of the magnets and traversing the magnets and the spaces therebetween and intensifying the magnetic fields in the spaces.