Electro-acoustic planar transducer
First Claim
1. An electro acoustic planar transducer comprising:
- a. a substantially planar frame having a front side and a rear side;
b. means for mounting said frame on a vertical planar surface so that said front side faces away from the planar surface;
c. a planar, rectangular, woofer diaphragm, the long dimension of said woofer diaphragm being in vertical attitude, said woofer diaphragm having a vertical proximal edge and an opposite vertical distal edge;
d. means for mounting said woofer diaphragm on and parallel to said frame for alternating movement toward and away from said front side and said rear side, said proximal edge being mounted on said frame and said distal edge being movable;
e. first cooperating coil and magnet means, interposed between said frame and said woofer diaphragm, for driving said woofer diaphragm in response to an electrical signal impressed upon said first coil means, said distal edge partaking in excursions as said woofer diaphragm is driven;
f. sound absorptive means mounted on said frame and interposed between at least one predetermined portion of said woofer diaphragm and said planar surface for attenuating the acoustic back waves generated by said predetermined portion of said woofer diaphragm;
g. a planar tweeter diaphragm;
h. means for mounting said tweeter diaphragm on and parallel to said frame for alternating movement toward and away from said front side and said rear side; and
,i. second cooperating coil and magnet means interposed between said frame and said tweeter diaphragm for driving said tweeter diaphragm in response to said electrical signal impressed upon said second coil means.
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Accused Products
Abstract
An electro-acoustic transducer using thin, lightweight, planar diaphragms driven by strategically located, coil-driven, high-energy, permanent magnets. A framework maintains the diaphragms in substantially co-planar relationship a predetermined distance from and parallel to a rear support wall. The diaphragms include at least one hinged woofer diaphragm and a foam-supported tweeter diaphragm. The small, high energy movable permanent magnets are attached to the rear surface of each movable diaphragm. Cooperating with each movable magnet is a respective, stationary electromagnetic coil with a crossover network directing the incoming signal to the appropriate coils, thereby placing the magnets and attached diaphragms into cooperating fore and aft motion. The frontal acoustical waves produced by each woofer constructively interfere to augment low frequency response. The tweeter construction provides wide frontal dispersion of high frequency acoustical waves. Woofer backwaves are attenuated before emerging along the rear support wall and the tweeter backwave is vented into a rear isolative chamber.
133 Citations
12 Claims
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1. An electro acoustic planar transducer comprising:
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a. a substantially planar frame having a front side and a rear side; b. means for mounting said frame on a vertical planar surface so that said front side faces away from the planar surface; c. a planar, rectangular, woofer diaphragm, the long dimension of said woofer diaphragm being in vertical attitude, said woofer diaphragm having a vertical proximal edge and an opposite vertical distal edge; d. means for mounting said woofer diaphragm on and parallel to said frame for alternating movement toward and away from said front side and said rear side, said proximal edge being mounted on said frame and said distal edge being movable; e. first cooperating coil and magnet means, interposed between said frame and said woofer diaphragm, for driving said woofer diaphragm in response to an electrical signal impressed upon said first coil means, said distal edge partaking in excursions as said woofer diaphragm is driven; f. sound absorptive means mounted on said frame and interposed between at least one predetermined portion of said woofer diaphragm and said planar surface for attenuating the acoustic back waves generated by said predetermined portion of said woofer diaphragm; g. a planar tweeter diaphragm; h. means for mounting said tweeter diaphragm on and parallel to said frame for alternating movement toward and away from said front side and said rear side; and
,i. second cooperating coil and magnet means interposed between said frame and said tweeter diaphragm for driving said tweeter diaphragm in response to said electrical signal impressed upon said second coil means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electro-acoustical transducer for use on a planar surface comprising:
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a. A pair of lightweight, substantially rigid, planar, woofer diaphragms; b. lightweight substantially rigid, planar, tweeter diaphragm; c. a frame having a front side and a rear side, said rear side facing toward the planar surface; d. means for mounting said woofer diaphragms and said tweeter diaphragm on said frame in co-planar relation a predetermined distance from the planar surface of predetermined width to form a channel around the periphery of said diaphragms, said woofer diaphragms being attached to said frame at their adjacent proximal edges allowing unimpeded front and rear motion of their respective distal edges; and
,e. electro-mechanical drive means mounted on said frame and interconnected to said woofer diaphragms a predetermined distance from said adjacent proximal edges of said woofer diaphragms for placing said woofer diaphragms into front and rear motion about their respective proximal edges in response to an electrical drive signal, said drive means being further interconnected to said tweeter diaphragm for placing said tweeter diaphragm into front and rear motion in accordance with a supplied electrical drive signal. - View Dependent Claims (9, 10, 11, 12)
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Specification