Abstract: A loudspeaker is provided including a diaphragm having a lower end formed with an inner surface mounted to the voice coil former, an outer surface spaced from the inner surface and a number of circumferentially-spaced vent bores formed between the inner and outer surfaces which vent a dust cap cavity. Alternatively, the lower end of the diaphragm is mounted to the outer surface of the voice coil in position so that a deflector formed in such lower end is located in the path of a flow of air entering and leaving the dust cap cavity through vent bores formed in the voice coil former to direct such air flow over the wire winding of the voice coil and obtain at least some cooling thereof in addition to venting the dust cap cavity.

Abstract: A loudspeaker comprising a frame, a motor structure, an upper suspension, a lower suspension, a diaphragm, and, a voice coil carrying a wire winding and being formed with a number of circumferentially spaced vent bores spaced from the winding. An adaptor is provided having a wall with a first end mounted to the former of the voice coil, a second end, and an intermediate portion extending between the first and second ends which overlies the vent bores of the former and is radially offset thus forming a passage between the wall of the adaptor and a portion of the outer surface of the former. A ledge is formed at the second end of the adaptor wall for mounting the free ends of the diaphragm and lower suspension, which, in turn, position the voice coil within the magnetic gap in the motor structure.

Abstract: A loudspeaker having an air cooled voice coil. The speaker includes frame, a cone and a cap collectively forming a vibratingly drivable diaphragm, a magnet, a pole piece, a voice coil disposed to drive the diaphragm, and preferably a spider disposed to secure the diaphragm to the frame at one end of the diaphragm. The magnet is part of a magnet assembly having air passages disposed to enable air to flow over the voice coil, and to be efficiently conducted away therefrom. The voice coil has apertures enabling cooling air to flow from the air passages in close, heat exchange relation to the voice coil. In alternative embodiments, the air passages extend horizontally and vertically through the magnet assembly, and may interconnect. Preferably, the diaphragm acts to pressurize air to establish flow for cooling purposes. In alternative embodiments, independent sources of pressurized air are contemplated.

Abstract: An integrated amplifier and speaker system includes a speaker having a motor assembly and a frame. A power stage of the amplifier is mounted in thermal communication with the motor assembly and/or the frame. Heat generated by the power stage is thereby sunk to the motor assembly and frame.

Abstract: An electronics/heat sink housing used in combination with a loudspeaker or powered speaker having an enclosure, a passive radiator, and an electronics package. The electronics/heat sink housing includes a planar back plate, a top plate, two side plates, and a bottom connector plate. The housing is mounted directly onto a rear panel of the speaker enclosure over the electronics package and passive radiator of the speaker. A plurality of slots are formed within the electronics/heat sink housing, preferably along the side plates and top plate of the housing, where they are bent relative to the back plate. A plurality of larger slots also may be formed along the side plates of the housing. The total area of these slots is greater than the area of the passive radiator, so that the enclosure does not interfere with air movement and sound pressure wave propagation from the passive radiator. Air movement caused by the passive radiator serves to enhance the thermal cooling of the electronic components.

Abstract: A fully integrated, low cost, amplified electro-acoustic loudspeaker is disclosed in which an amplifier circuit (30, 130, 230, 330, 930, 1030), radio-frequency receiver amplifier circuit (430, 530), optical receiver amplifier circuit (630, 730), or network based amplifier circuit (830) is directly mounted on the loudspeaker's magnetic assembly (105, 505, 705, 805), contained within the loudspeaker's moving assembly (20, 29, 629, 42, 45, 50, 65), or a combination thereof. The amplified loudspeaker's magnetic assembly (5, 105, 405, 505, 705, 805, 905, 1005) is utilized as an electro-magnetic interference shield and/or a heat dissipating element for the attached electronic circuitry. In selected embodiments of the amplified loudspeaker system, the former (42) containing voice coil (45) is additionally utilized for convection cooling of the amplifier circuit (30, 230) or receiver/amplifier circuit combination (430, 630).

Abstract: A loudspeaker is disclosed having a pole piece formed with at least one axial bore, and at least one vent bore extending between the outer surface of the pole piece and intersecting the axial bore at a location where the voice coil of the loudspeaker is concentrically disposed about the pole piece. The at least one axial bore and at least one vent bore are effective to cause the flow of cooling air, which enters and exits the dust cap cavity from outside of the speaker, to flow directly against at least a portion of the interior of the former of the voice coil.

Abstract: An electro-acoustic transducer comprises a metal single-piece blade diaphragm having a very good heat conductivity and mechanical characteristics, the metal blade of which is resiliently suspended and supports the acoustical current wire fixed at the center of mass thereof to the active metal surface of the transducer, so that the acoustical current wire communicates to the blade the heat which is produced because of the acoustical current and added to that generated in the blade because of the deformation of the resilient suspension.

Abstract: A loudspeaker comprises a frame mounted to a motor structure, an upper suspension connected between the voice coil of the motor structure and the frame, and, a lower suspension extending from the voice coil to the frame in position to form a cavity between the top plate of the motor and the lower suspension. A flow path is formed at the juncture of the frame and top plate of the motor through which a comparatively high volume of air is circulated in and out of the cavity between the lower suspension and lower end of the frame in response to excursion of the voice coil during operation of the speaker. The flow path is positioned to direct such air flow over the top plate and at least along a portion of the voice coil to aid in cooling of these elements.

Abstract: A loudspeaker is superior in space saving ability for enabling down-sizing of a device, to which the loudspeaker is employed, and has frequency characteristics easily designed and adjusted. The loudspeaker includes a vibration plate formed with a plurality of heat radiating through openings, and a vibrating portion responsive to an input electrical signal and driving the vibration plate for generating an acoustic vibration.

Abstract: A broad band loudspeaker (101) includes a diaphragm (103) driven by coil assembly (125) centered on a pole (131) of a magnet assembly (133) by a low-friction guide (127) depending from a lower end the coil assembly, and a low-friction guide mounted on an upper end of the pole (131). A suspension (107) for the diaphragm (103) includes two or more parallel, resilient suspension members (115a, 115b), extending between the diaphragm (103) and frame (105) and mounted through a pair of resilient mounting pads (119a, 119b, 125a, 125b). The lower guide (127) includes a flexible portion (151a) which acts like a flapper valve of a pump to create a current of cooling air past down the inside of the coil assembly (125), up the outside of the coil assembly and then out of flux gap (130).

Abstract: A voice coil adaptor ring and loudspeaker system of the moving coil type including a cone diaphragm supported by a frame, a voice coil former for supporting a voice coil, and a lower suspension for securing and centering the voice coil former in a magnetic gap while it is displaced by a magnetic circuit. The voice coil adaptor ring is mounted over the voice coil former and comprises a substantially cylindrical sleeve having a lower diameter for fitting over the top plate; at least one ledge extending outward from said sleeve for supporting the cone and lower suspension; an inherent gap for receiving epoxies; and a plurality of venting passages in fluid communication with a cap volume defined by the cone and dust cap for venting hot air from the cap volume.

Abstract: The present invention relates to a hearing aid receiver (10) having a coil (12) with a tunnel (14) therethrough, a magnetic structure (16) having a central magnetic gap (18), an armature (20), and a fluid (30, 32) with a viscosity greater than air to provide shock protection to the receiver (10). The tunnel (14) and the magnetic gap (18) collectively form an armature aperture (28). The armature (20) extends through the armature aperture (28). The fluid (30, 32) lies within the armature aperture (28).

Abstract: An improved planar diaphragm loudspeaker having a voice coil assembly coupled to the rear surface of a planar diaphragm formed of a pre-expanded cellular plastic material, in which a metal dissipator in the form of a disk is mounted between the voice coil assembly and the planar diaphragm to reduce the transfer of heat from the voice coil assembly to the planar diaphragm.

Abstract: A driver for use with a horn radiator includes a heat conductive hollow base that confines an upwardly opened cavity for receiving a yoke. The yoke has an outer wall surface that defines a first clearance with the base, and an inner wall surface which is formed with a through hole that extends to the outer wall surface. A permanent magnet is received in the yoke, and defines a second clearance with the inner wall surface of the yoke. A flux guiding plate is superimposed on the permanent magnet, and is disposed in the yoke to define a gap with the inner wall surface of the yoke. The second clearance is communicated fluidly with the first clearance via the through hole, and is in fluid communication with the gap. A diaphragm has a top portion disposed above the flux guiding plate, and an annular extension extending into the gap. A voice coil is connected to the annular extension of the diaphragm, and is disposed in the gap.

Abstract: A compact horn speaker suitable for use on emergency vehicles has a rear-facing motor circuit, a horn plate, and a mouth section. The horn plate has a plurality of horns folded therein in a plane perpendicular to the longitudinal direction of the speaker. The phase plug for the motor circuit is integrally formed on the horn plate and has a plurality of apertures each opening to a folded horn in the horn plate. The folded horns are connected to a horn mouth formed in the mouth section. The mouth section is formed of a thermally conductive material and has an integrally formed receptacle for receiving the magnet assembly of the motor circuit. The receptacle holds the motor circuit firmly in position and provides efficient thermal dissipation via the horn structure for heat generated by the motor circuit during operation.

Abstract: An audio speaker, the voice coil of which is passively cooled by using at least one of the speaker cone and spider as a bellows to draw air in and to push air out through a first vent passing through the voice coil and a second vent, connected to the first vent through an air flow path, which second vent is formed in a basket of the speaker which is formed of a material having good heat transfer properties. Air drawn into the speaker through the first vent removes heat from the voice coil and is heated thereby. This air is mixed with cooler air drawn in through the second vent which cooler air is expelled through both vents under appropriate action of the bellows. Partially cooled air expelled through the first vent further cools the voice coil and expelled through the second vent, which is also partially heated, has heat removed therefrom as it passes through the second vent formed in the basket, the relatively large area of the basket passed through by this air functioning as a heat sink.

Abstract: The present invention relates to a structure of speaker which includes a disk body directly connected to the opening of a sound coil in a speaker. The disk body has a couple of reinforcing heat-sinking rings, and the opening edge of disk body is connected with the belly plate of speaker. The speaker of such structure is effective to radiate heat produced from the sound coil through the direct connection of the disk body with the sound coil and due to the light-weighted and thin metallic disk body having effective heat radiation so as to prolong the duration of play as well as the life span of the speaker. The end of the disk body projecting in the sound coil and the other end connected to the belly plate increases the capacity of resistance of the vibration wave and therefore one single speaker may provide an output as a tweeter and a woofer. The disk body directly connecting to the sound coil may give high fidelity of the vibration wave arising from movement of sound coil so as to improve sound quality.

Abstract: A loudspeaker comprises a yoke; one or more vibration driving coils disposed so as to interact magnetically with the yoke when an electrical current flows through the coils; and one or more signal amplifying devices mounted on or near the yoke, the amplifying devices being operable to receive an input audio signal, to amplify the input signal to generate an amplified signal, and to supply the amplified signal to the vibration driving coils.

Abstract: A self-cooling loudspeaker comprises a speaker frame, a diaphragm connected to the speaker frame, a voice coil connected to the diaphragm and a permanent magnet assembly having a central opening. The permanent magnet assembly comprises a permanent magnet disposed between a top plate and a bottom plate. A pole piece is disposed co-axially within the central opening of the permanent magnet assembly to form an air gap between the pole piece and the permanent magnetic assembly into which the voice coil is disposed. In one embodiment of the present invention, the top plate is stamped to form a plurality of intake air paths in communication with the air gap and a plurality of outtake air paths in communication with the air gap, the plurality of intake air paths having a decreasing cross-sectional area towards the central opening of the permanent magnet assembly, and the plurality of outtake air paths having an increasing cross-sectional area towards the central opening of the permanent magnet assembly.

Abstract: A high power compact tweeter which includes a high energy magnet sandwiched between the base of a yoke and top plate which form the magnetic path, the magnet and top plate being spaced from side walls of the yoke by a predetermined gap. A voice coil is positioned in the gap. A heat sink is in thermal contact with the yoke to facilitate, preferably in conjunction with heat transfer management from the speaker.