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| Number | Title | Issue Date |
| 4425524 | Piezoelectric switch using piezoceramic bending elements, and in particular a relay utilizing such elements A piezoceramic device has two layers of piezoceramic material bonded together, the layers polarized in opposite directions. The device is used to detect, and indicate, a change of voltage between two conductors and specifically is used between the tip and... | 01/10/1984 |
| 4420266 | Piezoelectric printer and piezoelectric multilam actuator used therein A piezoelectric printer including: a frame; a plurality of printer units mounted on the frame; each unit including a piezoelectric multilam including at least two piezoelectric members and having a mounting portion and an actuating portion; the actuating ... | 12/13/1983 |
| 4419599 | Piezoelectric transducer made from a polymer material and process for manufacturing same Piezoelectric and pyroelectric transducers whose active element is formed by a polymer film. The transducer is manufactured from a flat polymer film by stretching this film over a mold so as to give it a self-supporting form and electroforming the stretch... | 12/06/1983 |
| 4417169 | Photoelectric drive circuit for a piezoelectric bimorph element A photoelectric circuit arrangement includes one direct current voltage source and first and second photoconductive networks, each comprising at least one resistance and one photoconductive cell. An output voltage generated between two output terminals of... | 11/22/1983 |
| 4403166 | Piezoelectric relay with oppositely bending bimorphs The invention relates to a piezoelectric relay in which a bimorph is used as a flexible element. First, second and third relay contacts (14), (14') and (14") are disposed coplanar with the third relay contact sandwiched between the first and second relay ... | 09/06/1983 |
| 4400642 | Piezoelectric composite materials A laminated structural device has the ability to change shape, position and resonant frequency without using discrete motive components. The laminate (10) may be a combination of layers (14,16) of a piezoelectrically active, non-conductive matrix material... | 08/23/1983 |
| 4383763 | Controllable mirrors A mirror constrained to translation and whose position is controlled by a piezoelectric ceramic operating as a bimorph.... | 05/17/1983 |
| 4383195 | Piezoelectric snap actuator A piezoelectric actuator including a piezoelectric element; a snap-action device for exerting a positive force in opposition to the piezoelectric element and having a predetermined reaction force that must be overcome to cause the snap action; the piezoel... | 05/10/1983 |
| 4369391 | Pressure-sensing transducer device having a piezoelectric polymer element and a method of fabrication of said device A pressure-sensing piezoelectric transducer device having an active element fabricated from polymeric material which has previously been polarized and comprising electrodes, at least one of which is embedded in the polymeric material. The device has the c... | 01/18/1983 |
| 4363993 | Piezoelectric electro-mechanical bimorph 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... | 12/14/1982 |
| 4359892 | Arrangement for measuring surface profiles A surface testing apparatus includes a bilaminar ceramic flexure element provided with means for generating a voltage which is proportional to the deflection of the flexure element. This voltage is compared with a reference voltage. After amplification th... | 11/23/1982 |
| 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 |
| 4339682 | Rotative motor using a piezoelectric element A rotative motor includes a member mounted to rotate freely. A pair of piezoelectric bimorph elements are excited from a source of alternating current so that free ends of the respective elements vibrate ninety degrees out of phase. The central point of a... | 07/13/1982 |
| 4333029 | Piezoelectric seismic sensor for intrusion detection A seismic sensor for intrusion detection includes a base, a cantilever member of piezoelectric construction extending from the base, and a mass loading the end of the cantilever member remote from the base. The base defines a slot for receiving the end of... | 06/01/1982 |
| 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 |
| 4307602 | Knock sensor A piezoelectric ceramic vibrator is mounted inside a metal case including a portion adapted for fastening the case to an engine, and the vibrator is adapted to resonate in response to a vibration frequency produced upon knocking of the engine. The output ... | 12/29/1981 |
| 4295172 | Rotary magnetic head apparatus A rotary magnetic head apparatus having a bending mode vibrator or vibrators mounted on a rotary cylinder, the vibrator comprising either ring shape piezoelectric vibrators bonded together with their polarization axes aligned in the direction of the thick... | 10/13/1981 |
| 4245172 | Transducer for generation and detection of shear waves An improved transducer for generating and detecting shear waves using pielectric bimorph elements. A plurality of pairs of bimorph elements are formed by rigidly attaching together two individual lengths of piezoelectric material with each dimensioned to... | 01/13/1981 |
| 4237399 | Driving circuit for piezo-electric multimorph transducer A piezo-electric transducer, such as, a bi-morph leaf, comprised of a pair of piezo-electric elements which are oppositely poled in opposite directions and interposed between inner and outer electrodes with each element being bonded to the other at the re... | 12/02/1980 |
| 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 |
| 4194194 | Piezoelectric vibration detector for sensing a nearby intruder An intrusion sensor uses thin film piezoelectric transducers to sense nea mechanical vibrations. A hose-like sheath contains a pair of insulating strips which carry conductive leaves on their outer surfaces. A series of longitudinally arranged segments o... | 03/18/1980 |
| 4190336 | Piezoelectric power supply for cameras A shutter control device is disclosed which includes a shutter which is openable to permit scene light to pass through a camera aperture, an electronic circuit for controlling the shutter to automatically establish exposure duration in accordance with the... | 02/26/1980 |
| 4162832 | Exposure control with piezoelectric latch control A camera is disclosed which includes a shutter blade magnetically latchable in an open position to permit scene light to pass through a camera aperture, flexible piezoelectric energy converter, such as a Bimorph element, movable upon being subjected to an... | 07/31/1979 |
| 4156800 | Piezoelectric transducer A piezoelectric transducer including a member composed of at least two superposed plastics layers at least one of which is piezoelectric, the said at least one piezoelectric layer being sandwiched in an untensioned state between two electrically conductin... | 05/29/1979 |
| 4123136 | Piezo-electric line of sight corrector for inertial platform stabilized sensor in a stellar navigational system A line-of-sight corrector using piezo-electric crystals as actuators is provided for the inertial platform stabilized tracking telescope of an astro navigational system. The tracking telescope in the embodiment of the invention to be described herein incl... | 10/31/1978 |
| 4119979 | Timed piezoelectric shutter control for cameras A camera is disclosed which includes a shutter latchable in an open position to permit scene light to pass through a camera aperture, an electronic circuit for producing a sudden change in voltage after an exposure period determined by the level of scene ... | 10/10/1978 |
| 4113387 | Dual mode laser optics control for ring laser gyro In a ring laser type gyro, laser optics adjustment means comprising a duo-mode bimorph device for separately controlling each of the optical length and alignment of the gyro laser optics.... | 09/12/1978 |
| 4112279 | Piezoelectric relay construction A piezoelectric relay construction in which the active element comprises a bimorph sheet having a substantially "U" shaped perforation therethrough to present an armature section having a free end deflectable within the boundaries of the sheet and a frame... | 09/05/1978 |
| 4110654 | Device for monitoring the travel of yarn-like structures at a textile machine A device for monitoring the travel of yarn-like structures at a textile machine comprises a cantilever member vibrating in a flexural mode when excited by a traveling yarn which is in contact with the upper or free end of said cantilever member. The lower... | 08/29/1978 |
| 4099211 | Positionable transducing mounting structure and driving system therefor In a system mounting a magnetic transducer on the end of a thin leaf for sweeping motion displacement laterally to a track on a record surface, the present invention utilizes elements arranged as reversely deflectable leaf portions so as to maintain the t... | 07/04/1978 |
| 4093883 | Piezoelectric multimorph switches A multimorph is a piezoelectric element which moves or bends as an incident to being charged or otherwise subjected to an electrostatic field so that a potential gradient appears across the element. The amount of movement or bending can be sufficient to a... | 06/06/1978 |
| 4087716 | Multi-layer element consisting of piezoelectric ceramic laminations and method of making same A multi-layer element consisting of piezoelectric ceramic laminations possesses partially overlapping metal layers which are electrically connected to one another. Adjacent metal layers can each be connected to different poles of a voltage source, the lam... | 05/02/1978 |
| 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 |
| 4060741 | High power piezoelectric bender A bimorph bender is comprised of a pair of piezoelectric circular discs having diametrically opposed surface portions. Signal carrying electrodes are formed contiguous with each surface portion. A center vane is sandwiched between the discs maintaining th... | 11/29/1977 |
| 4035671 | Piezoelectric wire matrix printer head A unique printer head employs a plurality of bimorph benders to drive a wire matrix. The benders are of the circular, high power type, having centrally located coupling washers. A housing supports the benders which are stackably mounted therein such that ... | 07/12/1977 |
| 4013992 | Diver's piezoelectric microphone with integral AGC preamplifier An improved microphone assembly for use in a diver's mask or helmet and wh is characterized by a substantially flat frequency response at pressures from 1 to 30 or more atmospheres of breathing gas. A silicone rubber coated piezoelectric diaphragm is mou... | 03/22/1977 |
| 3995451 | Patterning mechanism Patterning mechanism for electrically controllable knitting machines for selecting the knitting needles or their control elements, with which are associated bendable control springs having at least two positions for initiating selection operations accordi... | 12/07/1976 |
| 3955049 | Printing head A printing head provides an array of stylii and stylii drivers for forming characters in accordance with a desired matrix of dots. Each driver comprises a flat piezoelectric ceramic wafer and a levered beam having a stylus secured to one end and providing... | 05/04/1976 |
| 3950659 | Method of producing transducers with phase, area and depth controlled polarization A method for obtaining controlled depth, controlled area, and controlled phase polarization of a piezoelectric transducer element. A controlled phase bias voltage is applied to two generally opposing surfaces of the transducer element, and heat is then ap... | 04/13/1976 |
| 3949247 | Mounting arrangement for a piezoelectric element An arrangement for mounting one end of a piezoelectric element operating in a bending mode about the one end to generate essentially linear movement for a part of a moving component operatively attached to the other end characterized by a support strip ad... | 04/06/1976 |
