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| Number | Title | Issue Date |
| 4370583 | Piezoelectric motor for dithering ring laser gyroscopes A transducer for driving a spoke of a ring laser gyroscope is fastened at a point of neutral radius on the spoke. The transducer may be a piezoelectric crystal provided with a pair of electrodes which are driven in push-pull by an AC voltage to dither the... | 01/25/1983 |
| 4349762 | Fiber reinforced piezoelectric bender transducer An electro-mechanical transducer having a first layer made of piezoelectric material having opposing major surfaces, a pair of electrodes formed on the major surfaces of the first layer, respectively, and a second layer clamped at its one surface to one o... | 09/14/1982 |
| 4336639 | Method of making a seismic apparatus A seismic streamer section includes a flexible tube with bulkheads at intervals therealong, end means to make electrical and mechanical connections with adjacent sections, tension lines extending from one end means to the other through the bulkheads, hydr... | 06/29/1982 |
| 4330730 | Wound piezoelectric polymer flexure devices Disclosed herein is a piezoelectric flexure device in which the piezoelectric element(s) thereof comprises a flexible piezoelectric layer (e.g. a suitably polarized polymeric film) which is tightly wound about an axis to produce a plurality of substantial... | 05/18/1982 |
| 4310913 | Stylus tracking aid using two bimorph elements longitudinally aligned A stylus assembly for use with a high density information record such as a grooved video disc. The stylus arm includes a first transducer for detecting lateral forces applied by the record groove to the pickup stylus, and a second transducer responsive to... | 01/12/1982 |
| 4295010 | Plural piezoelectric polymer film acoustic transducer An acoustic transducer with a plurality of metal-coated piezoelectric polymer films as an oscillator, adjacent film pairs being physically connected near their centers.... | 10/13/1981 |
| 4254661 | Ultrasonic transducer array Apparatus for the ultrasonic examination of an object, comprises: a transducer array comprising a plurality of adjacent transducer elements for directing pulses of ultrasonic energy along a beam into the object, characterized in that the width of each of the t... | 03/10/1981 |
| 4246447 | Piezoelectric transducer drive A stack of piezoelectric discs for driving the diaphragm of a transducer such as a loudspeaker. The discs are arranged in pairs with the outer edges of each pair supported by engagement with an O-ring against their planar faces. The pairs are connected by... | 01/20/1981 |
| 4234245 | Light control device using a bimorph element A light control device includes a bimorph element comprising two thin polyvinylidene fluoride films and a thin layer disposed therebetween to secure the films together. The bimorph element bends in accordance with an applied electric field to open or clos... | 11/18/1980 |
| 4233637 | Rotating magnetic head piezo-electric assembly and drive circuitry for video tape recorder A magnetic head assembly for a video tape recorder includes a piezo-electric support, preferably constituted by a bi-morph leaf or leaves, supported at one end, for example, on a rotary portion of a tape guide drum, and a magnetic head mounted at the othe... | 11/11/1980 |
| 4198140 | Piezoelectric camera shutter An exposure control device is disclosed a preferred form of which includes a shutter which is openable to permit scene light to pass through a camera aperture, an electronic circuit for producing a signal which varies with the level of scene illumination,... | 04/15/1980 |
| 4197479 | Intrusion detecting sensor assembly using a piezoelectric bender An intrusion detecting sensor assembly comprising a bracket having one leg to be clamped to the surface of a structural member, for instance of a building, and having a second leg spaced from the first leg and also abutting said surface, the second leg be... | 04/08/1980 |
| 4189734 | Method and apparatus for recording with writing fluids and drop projection means therefor A recording apparatus and method is disclosed which includes a writing fluid source feeding a drop projection means which ejects a series of droplets of writing fluid from a nozzle in a discontinuous stream with sufficient velocity to traverse a substanti... | 02/19/1980 |
| 4188645 | Piezoelectric servo for disk drive In a salient embodiment, an improved fine-positioning arrangement for mounting a recording transducer arm, comprising one or several pairs of "opposed" "piezo-flexures".... | 02/12/1980 |
| 4186325 | Cable supported piezoelectric bender intrusion detector array A cable supporting along its length one or more detector units, each comprising a bendable board which is much longer than it is wide and which supports near its center a piezoceramic transducer whose output is responsive to bending of the board, the cabl... | 01/29/1980 |
| 4184093 | Piezoelectric polymer rectangular flexural plate hydrophone A transducer, suitable for sensing acoustic signals underwater, includes a iezoelectric polymer film. The device comprises a rectangular sandwich arrangement with a plastic frame in the center having plastic plates connected on either side and a piezoelect... | 01/15/1980 |
| 4175546 | Device for measuring sensitivity to vibration A device for measuring the sensitivity of a patient to externally applied vibration. The device includes a pallometer head which supports a vibratable probe. The probe is caused to vibrate with a selected amplitude and at a selected frequency. The head is... | 11/27/1979 |
| 4163206 | Apparatus and method for seismic wave detection Seismic waves are detected for a given seismic prospect with an accelerometer and a hydrophone and the outputs of said accelerometer and hydrophone are combined directly to create a signal for seismic analysis. The accelerometer and hydrophone may be comb... | 07/31/1979 |
| 4160184 | Piezoelectric actuator for a ring laser A piezoelectric actuator for use in controlling the path length in a ring laser is made up of a plurality of piezoelectric discs which have a different polarity in their central area than at their circumference so as to result in exerting a pushpull effec... | 07/03/1979 |
| 4140936 | Square and rectangular electroacoustic bender bar transducer The transducer's active elements are a plurality of thin, narrow, piezoelric bars bonded side-by-side to a flexible plate. Electrically, a circuit is coupled across the thickness of each bar or strip to include the bars as a plurality of parallel capacit... | 02/20/1979 |
| 4093885 | Transducer assembly vibration sensor A sensor for sensing vibrations in a transducer assembly and for generating an electrical signal indicative of the vibrations is disclosed. The sensor includes a piezoelectric generator which is mounted with a bimorph on a common substrate. The piezoelect... | 06/06/1978 |
| 4089927 | Strain sensor employing bi layer piezoelectric polymer A strain sensor and a method for producing a remanent electrostatic image of the strain gradient existing on the surface of an object are disclosed. The sensor includes a layer of poled, piezoelectric material that is employed as a medium on which the str... | 05/16/1978 |
| 4078160 | Piezoelectric bimorph or monomorph bender structure A woven mesh of conductively coated stiff filaments is affixed between a first element deformable in response to an applied electronic signal and a second element which has substantially the same configuration as the first element and which may be electri... | 03/07/1978 |
| 4071785 | Laminated piezoelectric matrix switch A matrix switch comprises a lamination of several layers in which first and second piezoelectric films have row and column electrodes, respectively, arranged in parallel on their first surfaces. A ground electrode is between said row and column electrodes... | 01/31/1978 |
| 4067241 | Improvements in or relating to oscillating crystal transducer systems A fluid pressure transducer comprises a chamber; one or more matched, plate-like crystals within the chamber; electrical means for exciting each of the crystals and means for transmitting forces originating from fluid pressures on two diaphragms located o... | 01/10/1978 |
| 4010441 | Flexion-plate hydrophones A hydrophone including a flexible membrane which is encased along its periphery within two rings. A piezoelectric disc is placed against each face of the membrane. The membrane, encasement, and discs form a unit which is embedded in an elastomeric materia... | 03/01/1977 |
| 3988620 | Transducer having enhanced acceleration cancellation characteristics The specification discloses a pressure-sensitive transducer including two spaced pressure-sensitive subassemblies having matched parameters and which are electrically coupled together in a manner to minimize the effect of acceleration on the transducer. I... | 10/26/1976 |
| 3971250 | Electret sensing medium having plural sensing units A sensing medium having two sensing units each formed of a layer of poled electret material that is coated on each planar surface with an electrically conductive plate, such sensing units being separated from one another by a thermal insulating layer.... | 07/27/1976 |
| 3970878 | Piezoelectric transducer unit and hydrophone assembly A pressure-sensitive improved acceleration-cancelling hydrophone assembly and transducer unit for inclusion therein, each transducer unit being made of glass and metal parts hermetically sealed together with no exposed plastic, each sealed unit containing... | 07/20/1976 |
| 3940974 | Electrically compensated sensor A sensing device that may be employed as a thermal or stress sensor includes in one embodiment a pair of poled electret layers as sensing mediums for detecting variations in the ambient temperature of the sensor. The electret layers of such embodiment hav... | 03/02/1976 |
