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| Number | Title | Issue Date |
| 7242323 | Electronic device having touch sensor A variable capacitance unit is formed between one portion of a human body and an opposed electrode facing it through a casing of a robot toy (electronic device) when the one portion of the human body such as a hand or a finger approaches the surface of the casing of... | 07/10/2007 |
| 7205777 | Capacitive proximity switch A capacitive proximity switch for detecting the change in the capacitance relative to a setpoint capacitance by the approach or retreat of an object in the sensitive area of a proximity switch, especially for use in the door handle of a motor vehicle, provides relia... | 04/17/2007 |
| 7196553 | Sensor signal detection device The present invention provides a sensor signal detection device which allows the improvement of reliability. This sensor signal detection device comprises an internal power supply voltage generation circuit, a buffer amplifier for receiving signals from a sensor, a ... | 03/27/2007 |
| 7132768 | Human body detecting device A human body detecting device for detecting an approach of a human body includes a sensor electrode provided in a housing and having detecting portions for detecting the approach of the human body to the housing. Each of the detecting portions is provided at a respe... | 11/07/2006 |
| 7026844 | Sensor signal detection device The present invention provides a sensor signal detection device which allows the improvement of reliability. This sensor signal detection device comprises an internal power supply voltage generation circuit, a buffer amplifier for receiving signals from a sensor, a ... | 04/11/2006 |
| 6713897 | Touch switch with integral control circuit A touch switch apparatus for detecting the presence of an object such as a human appendage, the apparatus having a touch pad and a local control circuit connected to the touch pad and to a controlled device. The touch pad preferable includes a first electrode and a ... | 03/30/2004 |
| 6160322 | Pulse signal generation method and apparatus A pulse signal generator comprises a magnetic element capable of causing a large Barkhausen jump, a detector provided in relation to the magnetic element, a magnetic field source provided in the vicinity of the magnetic element to produce a biasing magnet... | 12/12/2000 |
| 5739598 | Selfadjusting capacitive level switch for a non-contact or contact sensing of media or objects Selfadjusting capacitive level switch for a non-contact or contact sensing of media or objects comprising a sensor (S6), on a dielectric body (db) of which between an opposite plate (op) and a plate (p) a screening plate (sp) is mounted. Starting from the... | 04/14/1998 |
| 5493691 | Oscillator-shuttle-circuit (OSC) networks for conditioning energy in higher-order symmetry algebraic topological forms and RF phase conjugation The present invention provides passive networks which act as the host to nonlinear and parametric interactions, with energy inputs to said networks being caused to "bleed off" auxiliary, and time-delayed conditioning flows resulting in phase modulations t... | 02/20/1996 |
| 5367265 | Moisture-sensing controller for a clothes dryer A moisture-sensing circuit for a clothes dryer separates the moisture-sensing and timing functions in a way that minimizes undesirable interaction and reduces effects of tolerances in components, temperature, and supply-voltage. Separate comparators are p... | 11/22/1994 |
| 4956612 | Magnetic mine firing circuit A firing circuit for a magnetic mine including an oscillator and magnetomr bridge is arranged to produce an alternating signal representative of the strength of the ambient magnetic field in the neighborhood of the mine. This signal after rectification a... | 09/11/1990 |
| 4939455 | Sensor having two-wire connection to load A sensor is connectable with a load circuit via two conductors. The sensor receives its electrical power from the load circuit via the two conductors and similarly provides its output signal indicative of the sensed phenomenon via the same conductors. An ... | 07/03/1990 |
| 4922227 | Touch-controlled switch and alarm system A touch-controlled switch and alarm system for protecting electrically conductive objects. The touch switch automatically adjusts itself within a few seconds to a wide range of ungrounded conductive objects, is not triggered by AC power line transients or... | 05/01/1990 |
| 4920281 | Proximity switch circuit The circuit operates a main switch SCR to pass an a.c. supply V through a load L when a metallic object is in proximity to coil L1. Coil L1 is driven by an oscillator comprising transistor T2 and associated components. SCR is gated on simultaneous occurre... | 04/24/1990 |
| 4843259 | Process for the non-contacting detection of eddy current-induced bodies, particularly metal objects, as well as to sensors based on the process The process for the detection of an eddy current-induced body in the action range of an inductive resonant circuit component (L) uses in place of a continuous operation and detection of the current change, a network containing a resonant circuit (L,C) is ... | 06/27/1989 |
| 4820152 | Single multi-function handpiece for dental instruments A single handpiece that can be used in multiple dental treatments is provided. The handpiece comprises a housing having a coil for producing an electromagnetic or electrostrictive field in the housing, and a number of inserts that react with the electroma... | 04/11/1989 |
| 4758735 | DC touch control switch circuit A switching circuit includes a source of direct current for operating an oscillator which in turn applies a signal to a detector circuit including a touch plate. The detector includes a voltage dividing capacitive system or, in one embodiment, a phase det... | 07/19/1988 |
| 4757341 | AC contactless switch A contactless switch for controlling a thyristor switching element by means of a sensor circuit includes a bridge rectifier across whose input terminals are connected in series on AC power supply and a load and across whose output terminals are connected ... | 07/12/1988 |
| 4682049 | Pulse shaper for inductive transmitters A pulse shaper for inductive transmitters, in particular inductive crankshaft angle transmitters on internal combustion engines is suggested, wherein a Schmitt-trigger is connected with the output of the transmitter. A peak value detector (D1,C) is connec... | 07/21/1987 |
| 4663542 | Electronic proximity sensor An electronic sensor of the contactless type has a free-running oscillator with internal positive feedback supplemented by an external negative feedback including a capacitive path whose impedance is normally high but is lowered in the presence of an obje... | 05/05/1987 |
| 4650314 | Film inspection machine A film or photo print inspection machine having a print-advancing drive means to run a strip or web of photo prints from at least one supply reel to a corresponding collecting reel, over a viewing surface, is provided with a presence switch means activate... | 03/17/1987 |
| 4635691 | Volume responsive liquid discharge nozzle A liquid discharge nozzle that dispenses liquid upon demand in a quantity that matches the volumetric capacity of the cup used to activate the nozzle. The nozzle has a first and second pair of diametrically opposed switch members that are disposed radiall... | 01/13/1987 |
| 4633099 | Feedback circuit for a semiconductor active element sensor The drain voltage of an IGFET having a channel responsive to the change in physical quantity to be measured is negatively fed back to the gate terminal of the IGFET. The negative feedback loop includes series connection of a first amplifier having an ampl... | 12/30/1986 |
| 4609869 | Magnetic sensor and circuit for detecting the edge of a target as it passes the centerline of the sensor A magnetic sensor for detecting the leading edge of a ferrous target as it passes the centerline of the sensor. The magnetic sensor includes a coil output representing the rate of change of magnetic flux as the target passes the sensor. The coil output is... | 09/02/1986 |
| 4551637 | Electronic monitoring system with direct-current power supply A contactless motion detector is energized in series with a load from a source of direct current via a pair of supply leads connected across a binary switching circuit in parallel with a voltage-generating network designed to deliver operating current to ... | 11/05/1985 |
| 4543497 | Electronic monitoring system with selective signal inversion A contactless motion detector is energized from a source of current via a pair of supply leads and delivers an output signal by way of a further lead through an Exclusive-OR gate to a control electrode of a binary electronic switch in circuit with the sou... | 09/24/1985 |
| 4527121 | Short-circuit-protected evaluation circuit of high stability for variable inductance transducers The inductance of a variable inductor is put in series with a resistor to provide a delay circuit at the output of an amplifying path and the delayed voltage is fed-back to produce square waves having a period representative of the induct. The amplifying ... | 07/02/1985 |
| 4470046 | Capacitively coupled machine tool safety system having a digital quantizer A machine tool safety system having a signal induced in a capacitive receptor antenna by the action of an electric field capacitively coupled thereto includes a receiver having an array of linear amplifiers with fast response times, a network connected to... | 09/04/1984 |
| 4468795 | Counting method and apparatus Integrated circuits contained in a rail are passed through cylindrical electrodes. Two electrodes are connected to an oscillator to transmit out of phase fields. A receiving electrode's output has the residual oscillator frequency component removed by a n... | 08/28/1984 |
| 4433309 | Proximity switch with built-in test circuit An inductive proximity switch with a built-in testing circuit for monitoring movable elements in which an oscillator has an inductive control element, the impedance of which varies in response to approaching elements with a built-in electrical tester for ... | 02/21/1984 |
| 4424458 | Contactless proximity sensor with multilevel response A signal detector of a contactless proximity sensor feeds three voltage comparators with reference inputs connected to points of different threshold potentials. When the incoming signal exceeds only the lowest threshold, a light-emitting diode is flashed ... | 01/03/1984 |
| 4420727 | Self oscillating acoustic displacement detector The present disclosure describes a system for detecting very small displacements of an object with respect to a self oscillating piezoelectric crystal by means of acoustic interference at the crystal. Acoustic energy transmitted by the oscillator is refle... | 12/13/1983 |
| 4420697 | Process and apparatus for monitoring thread breakage by the use of a threshold device In a process and apparatus for monitoring thread breaks without touching the thread, the stochastic electrical charge of the moving thread is detected without contact by means of a metallic plane electrode disposed at the textile machine close to the movi... | 12/13/1983 |
| 4360737 | Touch sensitive switch A switching device for connecting the phase terminal of a load to the phase terminal of an AC supply includes a conductive touch plate in a circuit which is completed upon contact by a person and in which current is caused to flow by virtue of the electri... | 11/23/1982 |
| 4352141 | Touch switch device A touch switch device includes a touch plate 3 or other touch member arranged, when touched, to interrupt the passage of an oscillating signal from a DC powered oscillator 31-34 to a charging circuit 36-39, including a capacitative store 38. The charging ... | 09/28/1982 |
| 4345167 | Capacitance proximity sensor A method for detecting the change in the capacitance of an antenna caused by the approach of a person to the antenna, including the step of charging said antenna to a predetermined voltage relative to ground or a reference antenna, the step of discharging... | 08/17/1982 |
| 4336491 | Electronic monitoring system stabilized against accidental triggering A contactless motion detector, including an oscillator sensitive to an approaching metallic element, includes an electronic switch such as a thyristor triggerable by an output signal from a demodulator comprising a storage capacitor which is alternately c... | 06/22/1982 |
| 4328433 | Proximity switch A proximity switch with two connecting wires for switching an alternating current is described. The switch comprises a rectifying circuit, a thyristor connected across the output terminals of the rectifying circuit, a stabilized power circuit connected ac... | 05/04/1982 |
| 4323829 | Capacitive sensor control system An electronic control system for controlling the operation of electromotive apparatus utilizes a capacitive sensor for sensing human touch and producing a command signal whose magnitude corresponds to the contact area of the contact. The sensor command si... | 04/06/1982 |
| 4308443 | Induction cook-top with improved touch control An induction heating system (40) is provided and includes a plurality of induction heating coils (118). Touch control pads (50, 52, 70, and 72) are provided together with circuitry (80) for generating energization control signals. Circuitry (112 and 116) ... | 12/29/1981 |
