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US 4,965,839 AGranted
Electro acoustic transducer and loudspeaker
OwnerBoaz Elieliinventor
Life of this patent
Estimating the term…
Abstract
A loudspeaker transducer has a coil (5) and a metal dome (11) with a skirt (13) arranged concentrically in a magnetic gap between pol pieces (2 and 4). The skirt (13) is inductively coupled to the coil (5) but is mechanically independent of the coil former tube (6). The tube (6) is connected to a main low frequency cone (9) and to a short concentric additional cone (16). A fixed element (14) providing phase correction and/or horn loading is fixed to the center pole piece (4) in front of the dome (11) and within the tube (6). The member (14) and tube (6) co-operate acoustically.
Claims11
An electro acoutic transducer comprising:
- a magnetic circuit including a first pole piece and a second pole piece defining therebetween a magnetic gap;
- a coil former;
- a coil for receiving electrical power for driving said transducer, said coil being wound on said coil former and being located at least partly in said magnetic gap;
- an acoustic radiating element having a skirt of electrically conductive material forming a shorted turn extending into said magnetic gap inside said coil, said acoustic radiating element being mechanically independent of said coil and said shorted turn being inductively coupled to said coil;
- and a fixed member located in front of said acoustic radiating element, said coil former extending forward of said acoustic radiating element and said fixed member being located at least partially within said coil former and having an end which faces said acoustic radiating element and which defines with said coil former an annular primary passage for exit of acoustic radiation generated by said acoustic radiating element.
2 more elements
Dependencies are inferred from the claim text.