Matches 201 - 250 out of 339 < 1 2 3 4 5 6 7 >
Match Document Document Title
4810997 Small sound generating device  
A small sound generating device such as may be incorporated into a child's stuffed doll or the like. The device includes a cover having a sound radiating hole formed therein, a holding plate, a...
4807294 Piezoelectric and foam resin sheet speaker  
A sheet speaker comprised of a planar piezoelectric ceramic sheet encapsulated in a planar sheet of hard resin foam, comprised of a polystyrene, urethane, urea or phenolic. The planar piezoelectric...
4784154 Interference resistant biomedical transducer  
An interference resistant biomedical transducer for monitoring the acoustic output of a patient's cardiac or respiratory system which provides a high degree of rejection of acoustic noise and...
4782910 Bi-polar bender transducer for logging tools  
A bender acoustic transducer has a flat, piezoelectric element affixed to a flat, elongated inert element. The ends of the inert element are hinged on a supporting rectangular frame which has a...
4782471 Omnidirectional transducer of elastic waves with a wide pass band and production process  
Omnidirectional, wide pass band, elastic wave transducer comprising a rigid magnetostrictive diaphragm, each surface element of the diaphragm constituting a unidirectional elastic wave transducer...
4779246 Electro-acoustic transducer  
An electro-acoustic transducer has a transducer plate having a piezo-electric layer attached thereto. The electro-acoustic transucer is clamped between bearing members at an annular edge region...
4768615 Acoustic transducer system  
The acoustic transducer system includes an electroacoustic transducer and a flexural oscillator plate which is coupled to the electroacoustic transducer. The flexural oscillator plate is so...
4763030 Magnetomechanical energy conversion  
A metallic glass ribbon of the formula Fe w B x Si y C z wherein 0.78≤w≤0.83, 0.13≤x≤0.17, 0.03≤y≤0.07, 0.005≤z≤0.03, and w+x+y+z=1, is annealed to remove mechanical...
4755975 Piezoelectric transducer for transmitting or receiving ultrasonic waves  
A piezoelectric transducer in which a casing is mounted in a sealing manner on a base member for supporting two rod-shaped terminals, a piezoelectric element is bonded to the inner surface of said...
4754440 Ultrasonic transducer  
A transducer includes a cup-shaped diaphragm having a planar portion in the form of a flange. The internal space of the cup is closed by a metallic support plate. A disc-shaped piezoelectric...
4751418 Electroacoustic transducer  
An electroacoustic transducer having a piezoelectric element disposed on a diaphragm for converting an acoustic signal to an electric signal, and a differential amplifier for amplifying the...
4703464 Permanent magnet biased magnetostrictive transducer  
A transducer which uses paramagnetic magnetostrictive rods or bars, e.g., compositions of the lanthanide series of elements such as Tb 0 .3 Dy 0 .7 Fe 2 , has the bars biased with a lengthwise flux...
4701749 Electroacoustic calling device with universal bearing supporting a sound aperture closure member  
An electroacoustic calling device comprising a piezoelectric transducer contained in a housing with an aperture therein through which sound is emitted. A closure member for controlling the size of...
4700396 Sound-wave receiving appliance  
A sound-wave receiving applicance comprises a resonance panel and a crystal type piezoelectric microphone responsive to oscillations generated by the soundwaves, said microphone being adapted for...
4692942 Electroacoustic transducer with piezoelectric diaphragm  
The invention relates to electroacoustic transducers and more particularly to microphones in which the conversion of an acoustic vibration into an electric voltage is provided by a piezoelectric...
4674161 Connection method for piezo-electric acoustic transducers in electro-acoustic capsules  
A piezo-electric acoustic transducer has two strip-shaped terminal leads for connection of an acoustic-electric transducer plate to an amplifier assembly of the microphone. Previously the two leads...
4668937 Speaker activation control by microcomputer  
A microwave oven includes a piezo-electric speaker for audible announcement purposes and a microcomputer for controlling operations of the microwave oven. The mocrocomputer always develops a...
4654554 Piezoelectric vibrating elements and piezoelectric electroacoustic transducers  
A piezoelectric speaker including a plurality of piezoelectric vibrating elements, each including a piezoelectric vibrating plate and a weight connected to near the point of center of gravity...
4641054 Piezoelectric electro-acoustic transducer  
A piezoelectric transducer is formed by fixedly laying a second oscillating plate over a first oscillating plate to which a piezoelectric oscillating assembly having a piezoelectric oscillating...
4636585 Telephone installations  
A telephone installation has two talk-listen stations each comprising a telephone case adapted to receive talking and listening means housed in a common receiver case. At least one switch is...
4607145 Electroacoustic transducer with a piezoelectric diaphragm  
A telephone transducer having a body and a spacer for securing a piezoelectric diaphragm and a printed circuit, wherein the body and the spacer are made with electrically conducting material to...
4602245 General purpose modular acoustic signal generator  
A general purpose modular acoustic signal generator includes an outer casing unit having a plurality of disengageably connected sections and an insert unit removably positioned in that outer casing...
4597099 Piezoelectric transducer  
A crystal sound producer has a piezoelectric crystal plate diaphragm which produces sound waves when applied with a voltage thereacross. A waveform transform plate has slits or linear grooves...
4578613 Diaphragm comprising at least one foil of a piezoelectric polymer material  
An electro-acoustic device comprising at least one diaphragm including a foil of a piezo-electric polymer material. In the rest condition the diaphragm is maintained in a curved position under...
4558249 Stretched piezopolymer transducer with unsupported areas  
In the disclosed transducer, a frame supports the edges of a piezopolymer sheet coated on both faces with electrodes, while a holding structure supports an area but leaves a larger area of the...
4554414 Multi-driver loudspeaker  
A multi-driver loudspeaker combination includes a first transducer of the dynamic radiator type, designed to reproduce sound in the lower portion of the audio frequency range. The radiator of the...
4515997 Direct digital loudspeaker  
A method of and apparatus for converting a digital signal to sound, the digital signal being encoded in a sequence of code words at a signal encoding frequency, the code words representing the...
4494032 Transducer plate for electro-acoustic transducers  
The invention relates to a transducer plate for electro-acoustic transducers, such as used in telecommunications technology, having a carrier plate and a ceramic plate arranged on a carrier plate....
4488010 Loudspeaker  
A loudspeaker primarily for the high frequency audio region includes a driving device coupled to a diaphragm of convex outer configuration and extending over more than 180° spherical angle. The...
4485322 Ultrasonic transducer  
Provided is an ultrasonic transducer having a resonator which defines a space together with a bimorph cell disposed in the ultrasonic transducer. The space is fluid-tightly closed by the top...
4481663 Network for use with piezoceramic transducer  
A network for matching an electrical source of audio signals to a piezoceramic driver for a high frequency loudspeaker. The network consists of all of the elements of a bandpass filter network, but...
4475014 Acoustical transducer  
A bimorph bender acoustical transducer driver or motor element in which no center vane is necessary. Elimination of the vane reduces the dynamic mass of the driver so that a thicker, more rugged...
4473721 High-frequency loud speaker  
A high-frequency loudspeaker has a movable diaphragm which is moved to and fro by an actuating unit. The actuating unit, under the impulses of a signal to be converted into sound waves, changes in...
4469920 Piezoelectric film device for conversion between digital electric signals and analog acoustic signals  
A piezoelectric film transducer useful in directly converting a digital signal into an acoustic analog signal; metallized film zones have different areas and are electrically insulated from each...
4461930 Acoustic transducer with honeycomb diaphragm  
An acoustic transducer having a honeycomb-type diaphragm material, which transducer comprises a piezoelectric element and a driving element supported within a housing frame and acoustically...
4458170 Ultrasonic transmitter-receiver  
An ultrasonic transmitter-receiver is characterized in that a diaphragm is disposed at the center of a laminated piezo-electric element and the periphery of the diaphragm is flexibly fixed in a...
4454386 Piezoelectric transducer for piezoelectric loud speaker  
A piezoelectric transducer for use in a piezoelectric loud speaker includes a metallic plate and a piezoelectric wafer fixed to at least one face of the metallic plate, a first end of the...
4449019 Piezoelectric loudspeaker  
A piezoelectric loudspeaker using a thin plate of piezoelectric ceramics of a high dielectric constant, and fixing a piezoelectric transducer including a thin plate of piezoelectric ceramic of a...
4440983 Electro-acoustic transducer with active dome  
The invention relates to an electro-acoustic transducer using a self-supporting active radiating membrane made from a polymer material. The invention provides a transducer in which a resilient...
4439640 Piezoelectric loudspeaker  
A piezoelectric loudspeaker thin plate-like shaped and using a piezoelectric ceramic plate for a sound-generating portion, which comprises a disc-shaped diaphragm formed of a metallic plate, a...
4430529 Piezoelectric loudspeaker  
A piezoelectric loudspeaker having a bending mode piezoelectric diaphragm mounted on a diaphragm stretched across a frame, the piezoelectric diaphragm being supported at its central portion to a...
4418248 Dual element headphone  
A stereophone includes cup assemblies which are supported over the ears of a user by a headband. Each cup assembly includes a piezoelectric acoustic transducer and a dynamic acoustic transducer....
4414436 Narrow-frequency band acoustic transducer  
A narrow-frequency band, acoustic transducer of high conversion efficiency over a narrow-frequency band, which transducer comprises: a truncated diaphragm having a depressed, circular area and a...
4401911 Active suspension piezoelectric polymer transducer  
An electromechanical transducer comprising a radiating structure whose active element is formed by a polymer film placed between two electrodes. The invention provides a transducer in which a...
4401857 Multiple speaker  
A piezoelectric cone-type speaker having a multiple structure in which a plurality of piezoelectric elements and speaker diaphragms individually coupled to them are coaxially or multi-axially...
4393373 Piezoelectric audible sound generator  
A piezoelectric audible sound generator having a feedback type piezoelectric transducer, an amplifier, and a phase compensator for adjusting the phase shift due to the combination of a bias...
4389548 Acoustic transducer  
In an acoustic transducer comprising a piezoelectric element for driving a speaker diaphragm, there is provided a cushioning member between a frame body and the piezoelectric element wherein said...
4386241 Piezoelectric loudspeaker  
A piezoelectric loudspeaker comprises a support member having an opening therethrough in which is disposed a circular piezoelectric vibrator. The vibrator is secured at its periphery to the support...
4379211 Arcuately tensioned piezoelectric diaphragm microphone  
A lightweight piezoelectric microphone using a metallized piezoelectric diaphragm arcuately bowed by a boss on a slotted baffle plate held in close parallel proximity to the diaphragm is disclosed....
4379212 Electro-acoustic transducer  
An electrical acoustical transducer is provided having a piezoelectrical layer in a housing with a transducer plate. The transducer plate divides the housing into a front chamber and a rear...
Matches 201 - 250 out of 339 < 1 2 3 4 5 6 7 >