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Ballistic resistant body covering
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| Number | Title | Issue Date |
| 5335284 | Coneless, no-moving-parts speaker A coneless, no-moving-parts dynamic speaker has its internal components firmly locked within a plastic housing structure to prevent their movement relative to the housing, and may be secured to a wall of a room. During operation of the speaker, mechanical... | 08/02/1994 |
| 5323466 | Tandem transducer magnet structure An active muffler for use in motor vehicles comprises a sensor, an electronic control responsive to the signal generated by the sensor for producing a drive signal delivered to a transducer which emits cancellation pulses phased 180° from the sound press... | 06/21/1994 |
| 5299176 | Balanced armature transducers with transverse gap An electromechanical transducer having permanent magnet means forming a bias field in a region between poles, and a vibratable armature having a first part in that region. The armature has a second part extending from the first part substantially external... | 03/29/1994 |
| 5246353 | Air breezing pump An air breezing pump designed to supply air for biasing the vibrator of a speaker by providing a conventional speaker with an air inlet valve and an air outlet valve on its vibrating medium, and thereby excluding existing ducts from the enclosure of the s... | 09/21/1993 |
| 5243662 | Electrodynamic sound generator for hearing aids A miniaturized electrodynamic sound generator comprises a diaphragm, a permanent magnet with pole pieces, a magnet yoke, and a coil. The yoke is designed such that is constitutes a housing or a cabinet of the sound generator. The permanent magnet and the ... | 09/07/1993 |
| 5214710 | Permanent magnet system with associated coil arrangement The invention relates to a permanent magnet system with associated coil arrangement, the permanent magnet system consisting of two axially polarized permanent magnet rings which are mounted one behind another in the axial direction, like poles of the perm... | 05/25/1993 |
| 5210805 | Transducer flux optimization A transducer for use in an active noise cancellation system is particularly adapted for use as a motor vehicle exhaust muffler by physically designing the transducer to optimize magnetic flux with increases in temperature through the operating temperature... | 05/11/1993 |
| 5166984 | Loudspeaker A loudspeaker comprising a T-shaped disc, a magnetic iron disc, a disc-shaped base, a voice coil, and a cone-shaped diaphragm, the two discs and the base having air holes to communicating with one another after being assembled together, the T-shaped disc ... | 11/24/1992 |
| 5155773 | Electrodynamic transducer including inset An electromagnetic transducer has a moving coil, a diaphragm and a magnet system enclosed within protecting covers. It includes an inset placed between the magnet system and the front cover. The inset is made of a non-magnetic, electrically insulating mat... | 10/13/1992 |
| 5150419 | Calotte-type treble loudspeaker The invention specifies a calotte-type (encased) loudspeaker distinguished by very small dimensions. The pot magnet (12) is joined to a single-piece case component (11) exclusively by means of elastic snap catches (32) such that a terminal locking hook (3... | 09/22/1992 |
| 5142260 | Transducer motor assembly A returnless coil motor assembly comprising a voice coil, first and second magnets, the poles of the first and second magnets providing aligned, opposing lines of force in first and second opposite directions, a first spacer having a first face adjacent a... | 08/25/1992 |
| 5073948 | Midrange loudspeaker driver A midrange loudspeaker driver of the cone diaphragm and magnetic coil type having a reflection free zone immediately behind the diaphragm and within the driver to significantly reduce internal reflections of the diaphragm's rear waves resulting in improve... | 12/17/1991 |
| 5070530 | Electroacoustic transducers with increased magnetic stability for distortion reduction A loudspeaker includes a radially slotted ceramic permanent magnet for reducing distortion. Other constructions include slotted top and bottom plates and radially slotted bucking magnets, in combination with slotted magnet loudspeakers. The slotted buckin... | 12/03/1991 |
| 5042072 | Self-cooled loudspeaker A self-cooled electrodynamic loudspeaker wherein the magnetic structure or pole piece has channels whereby cool air may be introduced and hot air may be exhausted to cool a voice coil by movement of the speaker diaphragm. This self-cooling results in grea... | 08/20/1991 |
| 4956868 | Magnetically shielded electromagnetic acoustic transducer An electromagnetic transducer including a diaphragm mechanically connected to an armature, a coil wound tranversely around the armature, a permanent magnet adjacent the armature, and one or more additional magnetic members completing a magnetic circuit ha... | 09/11/1990 |
| 4922541 | Acoustic horn audio reproducer An apparatus for audio reproduction, specifically, transduction of electrical signals into acoustic signals, or sound waves, which minimizes acoustic impedance matching problems and distortion by mounting a diaphragm inside the body of a horn having a mou... | 05/01/1990 |
| 4902996 | Movable coil driving unit A movable coil driving unit comprises a driven member movably supported by conductive flexible supporting members with respect to a fixed member, a coil fixed to the driven member, and a driving member provided with a power source. One ends of the support... | 02/20/1990 |
| 4868882 | Loudspeaker A loudspeaker is disclosed with a diaphragm and an annular moving coil fastened to the diaphragm. An annular permanent-magnet system is arranged concentrically relative to the moving coil and is fastened to a support. To obtain a high-power and extremely ... | 09/19/1989 |
| 4799266 | Electroacoustic converter An electroacoustic converter comprising a magnetic circuit including a center pole, a magnet and a top plate with an upper side surface of the center pole being space from an adjacent side of the top plate. The top plate includes an incision on a horizont... | 01/17/1989 |
| 4750257 | Method for making a magnet transducer assembly The method of making the diaphragm includes pressing on the front face of a film at spaced apart areas to deform it progressively into a series of closely-spaced generally U-shaped projections. A manufacturing device presses the sides of the projections i... | 06/14/1988 |
| 4720868 | Dynamic transducer device A dynamic speaker device having a small-sized vibrating plate for reproducing a high frequency sound is further provided with an additional coil in the vicinity of the magnet assembly of the speaker. The additional coil is mounted on a comparatively heavy... | 01/19/1988 |
| 4661973 | Minimization of distortion due to a voice coil displacement in a speaker unit A speaker of a type having a voice coil wound to a greater length than the length of a magnetic gap into which it extends formed between a pole of a yoke and an annular plate. A magnetic flux density setting structure is provided for establishing a consta... | 04/28/1987 |
| 4654486 | Poor-scatter pot magnet system for magnetic-dynamic loudspeakers or acoustic transducers A poor-scatter pot magnet system for magnetic-dynamic loudspeakers or acoustic transducers in which two permanent magnets, of which at least the upper one is a magnet ring. A pole core, an upper, perforated plate and a lower pole plate are built into an i... | 03/31/1987 |
| 4635287 | Audio-frequency electromechanical vibrator An audio-frequency electromechanical vibrator having a flat hollow case with a thin cover plate, a flat ring-shaped permanent magnet axially magnetized and a flat annular drive coil unit. The magnet and the coil unit are disposed in the case coaxial with ... | 01/06/1987 |
| 4628154 | Annular gap magnet system, particularly for low frequency loudspeakers An annular gap magnet system, in particular for a low frequency loudspeaker (Woofer), in which a coil is movable with a large stroke in the working air gap. A braking air gap provided in the region of the inner or lower pole plate produces a magnetic resi... | 12/09/1986 |
| 4590332 | Phase coherent low frequency speaker A phase coherent low frequency dynamic woofer type loud speaker has a shallow depth convex cone diaphragm peripherally secured to a loud speaker support frame at one face. A ring permanent magnet is disposed behind the convex cone encircling a concentrica... | 05/20/1986 |
| 4587714 | Manufacture of motor with split back magnet array A disc drive arrangement including RW head actuator driven by an improved voice coil motor, having ceramic back-magnets which are subdivided to give improved magnetic characteristics and operation (increased working flux and an increase in efficiency and ... | 05/13/1986 |
| 4580015 | Loud speaker with minimized magnetic leakage A loudspeaker is provided which has a novel integrally formed back plate and pole-piece. The back plate and pole-piece has an annular portion and a toroidal portion. The result is a marked reduction in magnetic leakage caused by reluctance due to interfac... | 04/01/1986 |
| 4577069 | Electroacoustical transducer A loudspeaker driver has a molded plastic basket and a stamped octagonal front pole plate of low reluctance magnetic material molded into the base of the basket. The break edge of the stamped pole plate is used as an undercut for encapsulation. A similar ... | 03/18/1986 |
| 4573189 | Loudspeaker with high frequency motional feedback A moving-coil loudspeaker system incorporating motional feedback operable at high frequencies, i.e. above about 1000 Hz. The feedback signal is developed by a tiny piezo-electric accelerometer mounted together with a charge amplifier directly on the louds... | 02/25/1986 |
| 4547632 | Dynamic loudspeaker An electromagnetic loudspeaker with a magnetic structure provided with a cylindrical gap and a frame supporting a diaphragm, the diaphragm carrying a voice coil suspended in the gap of the magnetic structure, the magnetic structure being provided with a t... | 10/15/1985 |
| 4531025 | Loudspeaker with commutated coil drive An improvement is provided in a loudspeaker having a current carrying coil disposed in the flux gap of a permanent magnet and carrying current to drive the coil and an associated sound diaphragm. The coil is substantially longer than the thickness of the ... | 07/23/1985 |
| 4529846 | Dynamic telephone receiver with magnetic shunt A dynamic telephone receiver which is capable of being used in association with hearing aids, has a flux coil positioned around the pole piece and magnet assembly. To minimize the strong magnetic leakage field radiated from the air gap, which can attract ... | 07/16/1985 |
| 4520237 | Electrodynamic speaker In an electrodynamic speaker comprising a vibrating plate, a voice coil secured to the vibrating plate, a magnetic circuit portion having a soft magnetic member and a magnet and having a magnetic gap, a frame for supporting the peripheral portion of the v... | 05/28/1985 |
| 4508941 | Voice coil centering and suspension for vented pole piece An apparatus and method for centering a voice coil in a loudspeaker having a vented pole piece. The voice coil centering is accomplished by means of a concentrically located voice coil suspension and an attached cylindrical mounting ring that can be set i... | 04/02/1985 |
| 4507800 | Enclosed magnet loudspeaker A loudspeaker in which a permanent magnet and associated yoke are encapsulated in a plastic housing. The voice coil and diaphragm are cemented to the top piece of the yoke to fix the position of the voice coil within the air gap defined by the yoke. The h... | 03/26/1985 |
| 4506117 | Electroacoustic transducer The electroacoustic transducer comprises an oscillating element (6, 7) holding a coil (8), the oscillating element (6, 7) being connected to a magnet frame (11-17) by an elastomer ring (10'). The magnet frame (11-17) has two magnets (14, 15) and constitut... | 03/19/1985 |
| 4492827 | Horn speaker with reduced magnetic flux leakage By adding a secondary magnetic piece with a partially open magnetic circuit to the front surface of a yoke connected to a primary magnetic piece, the magnetic flux leakage from the main magnetic piece is reduced on one hand and the magnetic flux extending... | 01/08/1985 |
| 4471172 | Planar diaphragm transducer with improved magnetic circuit A planar diaphragm type magnetic transducer with magnetic circuit wherein the magnet strips on the soft iron plate and confronting the diaphragm are arranged in a sequence south, north, north, south, south, north, north, south, et seq. The magnet strips a... | 09/11/1984 |
| 4465906 | Low-leakage pot magnet system for moving-coil loudspeakers A low-leakage pot magnet system for moving-coil loudspeakers having two permanent magnets of opposite polarity is accomplished by spacing the lower permanent magnet away from the bottom of the screen pot by an appropriate support which includes a disk or ... | 08/14/1984 |
