Abstract: For a process of producing a capacitive element with a storage node electrode formed of layered electrode, there is proposed a method of preventing an unstable condition that a part of the storage node electrode during the processes is positioned in the air without support therebelow. The storage node electrode is formed by embedding a polysilicon plug in an aperture which reaches to a silicon active layer on a silicon substrate from the surface where a polysilicon capacitive electrode is formed on a polysilicon capacitive electrode provided thereon with the first capacitive insulating film. After a second capacitive insulating film and a polysilicon capacitive electrode are formed, the polysilicon capacitive electrodes are connected with each other by a polysilicon plug to form a cell plate electrode.

Abstract: A grease composition for constant velocity joint, particularly Zeppa type joint comprises a base oil and contains (A) a particular diurea compound as a thickener, (B) molybdenum sulfide dialkyldithiocarbamate, (C) an extreme pressure additive of zinc dithiophosphate, (D) a sulfur-phosphorus series extreme pressure additive containing no metallic element and having a sulfur content of 10-30% by weight and a phosphorus content of 0.5-5% by weight, and (E) lead dialkyldithiocarbamate as an essential component.

Abstract: A piezoelectric transducer comprising first and second members in axial alignment and spaced apart, the first and second members being mutually displaceable toward and away from each other, and a transducer assembly disposed between the first and second members. The assembly includes a stationary means (first member), a piezoelectric element facing the stationary means on its entire surface, and a force converting means (second member) for generating a transverse force in direction radially outward from a center axis, facing the piezoelectric element at entire surface. The stationary means, the piezoelectric element and the force converting means are contained sequentially between the first and the second member.

Abstract: The electrostatic capacitance sensing circuit comprises a resonance circuit composed of an electrode capacitance formed by a substance to be measured and sandwiched between two opposing electrode plates and an inductance at least part of which is connected in parallel to the electrode capacitance; an active element (e.g. transistor) for constituting an oscillator in cooperation with the resonance circuit; and in particular a capacitor connected between the resonance circuit and the active element. Since a dc bias voltage of the active element is substantially not applied to the electrode plates, it is possible to prevent electrolytic corrosion of the electrode plates due to electromotive force generated between the electrode plates when ions are resolved into the substance to be measured and therefore the substance changes to an electrolytic solution.

Abstract: A fuel mix ratio sensor system comprises a cylindrical housing having a small diameter portion on one end at which an electrode is supported. A sealing means, such as an O-ring, directly contacts an inner periphery of the small diameter portion in order to secure the sensor against leakage of the detected fluid.

Abstract: A mounting device for a pressure sensor is disclosed. The mounting device comprises a cylinder head having a threaded hole for mounting a spark plug, a sensor housing orifice penetrating into a combustion chamber and a sensor pressure receiving section in the sensor housing orifice. A pressure sensor is mounted in the sensor housing orifice. The pressure sensor comprises a housing inserted into the sensor housing orifice and having a pressure receiving section for directly receiving the combustion pressure, and a piezoelectric device housed in the housing and producing a voltage corresponding to the combustion pressure received at the pressure received section. The device comprises a presser member pressing the pressure sensor toward the pressure receiving section by tightening of the spark plug. A vibration absorbing member is interposed between the presser member and the pressure sensor so as to absorb the vibration and the displacement transmitted from the presser member.

Abstract: A fuel concentration monitoring unit includes a fuel temperature dependent error correction circuit in the unit. A fuel concentration indicative voltage signal variation rate set with taking a specific fuel concentration as reference point. The output incorporated in the unit.

Abstract: A washer-type pressure sensor employs a cross-sectionally channel-shaped pressure plate which defines a space in which an assembly of a center electrode, piezoelectric elements, the other pressure plate and insulating members can be housed. With such construction, the insulating member surrounding the assembly of the center electrode, the piezoelectric elements, the outer pressure plate is not subject to corrosive liquid leaking from the inside of the engine. Therefore, life of the pressure sensor can be significantly expended.

Abstract: An instrument for testing the lubricating ability of a lubricating oil has a base member having a contact surface to be submerged in the oil, a vibration member having a friction portion pressed against the contact surface, a driving device having a driving element such as a driving piezoelectric element for vibrating the vibration member, a vibration pickup such as a sensing piezoelectric element for sensing a vibration produced by the friction between the friction portion and the contact surface with the interposition of the lubricating oil, an amplifier for amplifying the output of the pickup, a high-pass filter for filtering the output of the amplifier, and a voltmeter for receiving the output of the filter.

Abstract: To increase the sealing effect with increasing fluid pressure in a capacitive fluid sensor for sensing a dielectric constant of fluid, the sensor comprises a sensor housing, a fluid outlet pipe connected midway in the sensor housing, an internal electrode, a first cylindrical insulating internal electrode support member disposed within the sensor housing between the fluid outlet pipe and a sensor housing end, and a sealing member disposed between the first cylindrical support member and sensor housing end. It is preferable to dispose a second flat insulating internal electrode support member formed with a central annular portion and plural arms extending from the annular portion so as to be fitted to a swollen-out portion of the sensor housing to reduce fluid resistance.

Abstract: A pressure measuring instrument for the measurement of the combustion chamber pressure in a cylinder of an internal combustion engine, comprises a piezoelectric pressure sensor. The sensor includes an annular disk-like electrode with an output terminal, a piezoelectric element in contact with said electrode, a pair of annular pressure acting members having interposed therebetween said electrode and said piezoelectric element, and a lead. The piezoelectric pressure sensor is disposed between a first wall on a cylinder head and a second wall of a spark plug.

Abstract: In order to recover the heat of the waste gas from a gas turbine, a waste heat recovery boiler is provided, which has a high-pressure steam generating portion consisting of an economizer, a high-pressure steam generator and a superheater, and a low-pressure steam generating portion consisting of an economizer, and a low-pressure steam generator. The steam from the high-pressure generating portion is supplied to the turbine through a high-pressure steam pipe, and the steam from the low-pressure steam generating portion to the same through a low-pressure steam pipe. The high-pressure gland sealing steam is supplied to a high-pressure side steam gland portion the steam turbine through a high-pressure steam extracton pipe branching from the high-pressure steam pipe, a steam pressure regulator adapted to regulate the steam pressure and introduce the excess steam to a condenser, and a high-pressure gland sealing steam pipe.

Abstract: An improved lead calcium titanate piezoelectric sintered body is produced by sintering in air at 1000.degree. C.-1200.degree. C. a calcined mixture of oxides or oxide compounds in amounts adapted to form a composition of the formula Pb.sub.1-x Ca.sub.x Ti.sub.1-y (Co.sub.1/2 W.sub.1/2).sub.y O.sub.3 +0.005-0.02(A) where A is at least one of MnO, MnO.sub.2, NiO and Nb.sub.2 O.sub.3, wherein x=0.3-0.4 and 0.04<y.ltoreq.0.06.

Abstract: An ultrasonic vehicle rangefinder having a detecting system for discriminating whether trouble is in transmission or reception side is shown. The discrimination is established by detection of an attenuation vibration at a transmission microphone.

Abstract: A simple and shock-resistant device to measure angular acceleration about a predefined axis without using any spinning or vibrating mass. The device comprises a weight having a shape symmetrical with respect to an axis which becomes the aforementioned predefined axis, a stress transducer such as a piezoelectric element which is attached to the weight so as to have sensitivity to shear stress in a circumferential direction about the aforementioned axis, and a base member to which the assembly of the weight and the transducer is fixed such that at least a major portion of the weight is spaced from the base member. For example, the weight is a generally circular metal plate and the transducer is a ring-shaped element of a piezoelectric ceramic material having electrode films on the annular surfaces.

Abstract: A guide sleeve is joined at an end thereof to the outer periphery of an annular pressure sensor and fits in an ignition plug accommodation hole. The pressure sensor is clamped between an ignition plug and a plug seating at the bottom of the ignition plug accommodation hole. The guide sleeve projects at the other end thereof from the ignition plug accommodation hole and mounts at the other end thereof an annular sealing member which has opposite axial ends brought into sealing contact with a cylinder head and a protective boot fitted on the ignition plug.

Abstract: Disclosed is a washer type pressure sensor suitable for attachment to an opening for inserting an ignition plug of an engine. The sensor is provided with a pair of ring piezoelectric elements opposed to each other through a ring electrode. A first and a second pressure receiving ring plate are disposed on an upper and a lower surface of the piezoelectric elements, respectively. The first pressure receiving plate is provided with a cylindrical protecting portion extending from the inner periphery thereof to protect an inner periphery of the sensor.

Abstract: A pressure transducer suitable for remote sensing of pressure in hostile environments consists generally of a body and a sensing member. The body has first and second opposing inner surfaces defining an inside space therebetween. The sensing member is disposed within the inside space and has first and second opposite surfaces. The first surface of the sensing member contacts the first inner surface of the body. The second surface of the sensing member is separated from the second inner surface of the body by a predetermined clearance so that the second surface of the sensing member comes into contact with the second inner surface of the body only when the external force exerted on the body exceeds a predetermined level.

Abstract: An engine knocking detection method and apparatus which can accurately separate engine knocking vibration signals from background noise signals on the basis of the waveforms of the detected engine vibration signals. Usually, engine knocking vibration signals have frequency components of from 6 to 9 KHz and envelope time constants of from 1.5 to 50 ms. Therefore, the engine knocking detection apparatus according to the present invention comprises a band-pass filter (6-9 KHz), a first smoothing circuit which outputs only engine vibration signals with envelope time constants of 1.5 ms or more and a second smoothing circuit which outputs only background noise signals with time constants of 50 ms or more, in addition to a vibration sensor, amplifiers, a rectifier, and a comparator.

Abstract: A vibration sensor for an automotive vehicle having a multi-peak vibration characteristic of wider responsiveness and of a higher S/N ratio. The vibration sensor comprises a plurality of piezoelectric vibrators so arranged that the piezoelectric voltage signals from the vibrators are synthesized in reverse polarity between two elements having two adjacent resonant frequencies, when the element are deformed in the same direction. Therefore, the voltages are synthesized in the same polarity, when engine knocking frequency lies between two adjacent sensor resonant frequencies, because a vibrator is 180 degrees out of phase with another adjacent vibrator.