Patent ID: 9008348
Filing Date: 2015-04-14
Classification: H04R

Abstract:
1. A low profile loudspeaker comprising: a rigid frame; a magnetic yoke affixed to the rigid frame and comprising a slotted sidewall and a central slug disposed within the slotted sidewall to thereby form an air-gap therebetween, at least one of the slotted sidewall and the central slug being permanently magnetic such that the sidewall and central slug form a magnetic circuit; a voicecoil that is at least partially disposed within the air-gap, the voicecoil comprising a generally cylindrical former, with top and bottom edges and an inner and outer surfaces, and a first winding disposed on one of the inner and outer surfaces, the voicecoil moving within the air-gap in response to an alternating electrical potential being received by the first winding; a spider having at least one flexible outer portion affixed to the rigid frame and a rigid inner portion affixed to the bottom edge of the voicecoil former, the inner portion of the spider comprising an inner ring disposed between the slotted sidewall and the central slug of the yoke, an outer ring disposed outside of the slotted sidewall of the yoke, and plural rigid members coupling the inner ring to the outer ring and always extending through the sidewall slots; a resilient surround affixed to the rigid frame; and a rigid cone comprising an inner portion affixed to the top edge of the voicecoil former and an outer portion affixed to the resilient surround, the inner portion of the cone comprising a rigid inner ring capable of movement between the slotted sidewall and the central slug of the yoke, a rigid outer ring disposed outside of the slotted sidewall of the yoke, and plural rigid members coupling the inner ring to the outer ring, wherein the rigid members are capable of movement within the sidewall slots in response to movement of the voicecoil.