Abstract: A sensing device capable of obtaining an output signal corresponding precisely to a predetermined position (angle), for example, of a protruding or recessed portion of a moving magnetic-material member without being affected by temperature change.

Abstract: A magnetic object motion sensor which can operate with high accuracy not only when a magnetic object moves at high speeds but also even when it moves at low speeds, which can be produced with a greater production tolerance and a greater dimensional tolerance.

Abstract: A magnetic detector is disclosed with a power-on function which can essentially eliminate temperature characteristics of a magnetic field sensing device and improve edge detecting accuracy of alternately projected and recessed portions of a moving member of magnetic material. The magnetic detector comprises a magnet for generating a magnetic field, a rotary member of magnetic material disposed with a predetermined gap remaining relative to the magnet and having alternately projected and recessed portions to change the magnetic field generated by the magnet, and a magnetoresistive device comprising a plurality of magnetic field sensing elements and detecting changes in the magnetic field by movement of the rotary member of magnetic material.

Abstract: A magnetic sensor which can be produced in a small size at low cost with high productivity. The magnetic sensor includes: a main electric circuit; a magnet disposed on said main electric circuit; and a detector unit including an integrated circuit having a magnetic detector unit composed of a sensing resistor for outputting a signal in the form of a voltage change corresponding to the change in the magnetic field of the magnet, and having a filter for removing noise from a signal applied to a processing circuit of the integrated circuit.

Abstract: A method for manufacturing an inexpensive rotation sensor having excellent performance, high workability, and high reliability is provided. In the method, the rotation sensor is manufactured by providing an insert conductor having a predetermined shape and insert-molding the insert conductor in a resin base such that at least a connector terminal and an conversion device terminal of the insert conductor remains exposed from the resin base. Also, a resin connector part is molded after the resin base is molded such that the resin connector part encircles the connector terminal.

Abstract: A magnetic detecting apparatus is capable of performing accurate waveform processing without being affected by noise signals or the like, the level shifting circuit thereof having a fixed voltage shift so as to be free of varying amplitudes of analog signals. Waveform shaping circuitry for turning an analog signal detected from a giant magnetoresistive element into a pulse signal includes: the level shifting circuit for generating an amplified voltage (V1) of analog signals and a voltage (V2) which is higher than the voltage (V1) and a voltage (V3) which is lower than the voltage (V1); a circuit which alternately retains the minimum value of the voltage (V2) and the maximum value of the voltage (V3) as a reference voltage; and a comparator circuit which compares a voltage resulting from adding a hysteresis to the voltage (V1) with the reference voltage and issues a pulse signal.

Abstract: A rotation sensor is provided which is inexpensive and has excellent performance, high workability, and high reliability. Specifically, the rotation sensor contains a magnetoelectric conversion device, a base, an insert conductor, a surface mount electrode part, an electronic component, and a connector part. The magnetoelectric conversion device senses a magnetic flux change associated with a rotation of a magnetic rotation body, and the base is made of resin and holds the magnetoelectric conversion device. The insert conductor is insert-molded in the base, and an exposed part of the insert conductor is exposed to a surface of the base. The surface mount electrode part is formed by at least the exposed part of the insert conductor and is connected to the magnetoelectric conversion device. The electronic component is mounted on the surface mount electrode part, and the connector part is formed by using an end of the insert conductor as a terminal electrode.

Abstract: A rotation angle detecting device according to the present invention comprises: a sensor having a first yoke made of a magnetic material on which a magnet is mounted, a second yoke made of a magnetic material on which a magnetic flux detector is mounted, which is disposed opposite to the first yoke with a predetermined space, and a housing for supporting the first yoke and the second yoke, and a vane secured on a camshaft of an internal combustion engine, having a wall portion which passes through space between the first yoke and the second yoke, and a rotation angle of the internal combustion engine is detected in accordance with a signal produced at said magnetic flux detecting device by passage of the wall portion of said vane through said space.

Abstract: An apparatus for detecting an angular position of a crankshaft of an internal combustion engine includes a disk which is rotatable in synchronism with the rotation of the crankshaft, a row of magnetic elements disposed on the disk along a circumferential periphery thereof at circumferentially equal intervals, an electromagnetic pick-up device disposed orthogonally to a plane of rotation of the disk in opposition to the row of magnetic elements, and a shaping circuit for shaping an output signal of the electromagnetic pick-up device into a rectangular waveform signal. The shaping circuit is combined integrally with the electromagnetic pick-up device into a single unit to prevent external noise from being superposed on the output signal from the pick-up device. The shaping circuit includes an integrator for integrating the output signal to produce a reference signal for the comparator.

Abstract: A sensor for an automobile wherein a coating material 35 for covering the connections between a sensor body 11 and lead wires 20 is formed by injection-molding a thermoplastic elastomer. Since the elastomer has rubber elasticity, no stress concentration takes place in the lead wire connections even though the sensor is vibrated, and disconnection of the lead wires cannot easily take place.

Abstract: A filter circuit for an electromagnetic pickup can always generate a noise-filtered output signal of a high resolution without any substantial degradation of an S/N ratio even if the frequency of low-freqeucny noise components contained in an output of an electromagnetic pickup, increases in accordance with the increasing rotational speed of the rotating shaft. The filter circuit includes a low-pass filter 2 for filtering high-frequency noise components contained in the output signal from the electromagnetic pickup, and a high-pass filter 3 for filtering low-frequency noise components having frequencies lower than a predetermined cut-off frequency.

Abstract: A Hall effect type sensing device comprising a casing (20); a magnet (22), a first magnetic flux guide (21a) and a second magnetic flux guide (21b) which define a magnetic circuit; a Hall transducer (24) arranged to be opposite to the magnet (22) in the magnetic circuit; a board (23) for supporting the Hall transducer (24); an air gap formed between the magnet (22) and the Hall transducer (24); a magnetic flux shutter (5) which can shunt a magnetic flux in the air gap, and which passes through the air gap to cause a change in the magnetic flux, the change being detected by the Hall transducer (24); and an urging member (30) including a supporting arm (30a) for supporting a Hall IC assembly and an urging arm (30b) for urging the supporting arm (30a) to an inner wall of the casing (20), the Hall IC assembly being constituted by the second magnetic flux guide (21b), the Hall transducer (24) and the board (23); wherein the Hall IC assembly is located by an urging force of the urging member (30).