Abstract: A first and a second magnet are provided on a movable member so as to oppose to each other across a virtual plane. Each magnet is magnetized in a direction perpendicular to the movable member, so that the same magnetic poles of the magnets are opposed to each other. A hall IC is provided at a position more remote from the movable member than the magnets so as to be movable on the virtual plane relative to the movable member. A Y-parallel area is formed in a space equally distanced from the first and the second magnets, in which magnetic fields of the first and the second magnet rebel against each other, so that directions of the magnetic fields are so made to be in parallel to a stroke direction of the movable member. Robustness for a position gap between the magnets and the hall IC is improved.

Abstract: A stroke amount detection device includes a yoke, a magnetic flux generation section, and a magnetism detection section. The yoke has a protruding section that protrudes to outside the yoke. The magnetic flux generation section is located in the yoke. The magnetism detection section is disposed between the magnetic flux generation section and the protruding section. The magnetism detection section is disposed at a fixed position with respect to the magnetic flux generation section. The magnetism detection section outputs a signal in accordance with a magnetic flux density generated due to a relative movement of the yoke with respect to the magnetism detection section.

Abstract: A flow measuring device includes a flow rate detecting part, an analog/digital conversion part, and a signal processing part. The flow rate detecting part detects a flow rate of air flowing through the passage, and outputs a flow voltage signal, which is a voltage in accordance with the flow rate. The analog/digital conversion part converts the flow voltage signal from the flow rate detecting part into digital data, which is flow digital data. The signal processing part performs calculation processing upon the flow digital data, which includes averaging of a predetermined number of consecutive pieces of the flow digital data, and outputs the averaged flow digital data as a flow rate signal. The predetermined number is equal to or larger than two.

Abstract: A mounting structure for mounting a chip type electric element on a flexible board includes: the flexible board having a first land, on which a first lead terminal of another electric element is soldered; and the chip type electric element having a long side. A whole of the long side of the chip type electric element faces a long side of the first land. A length of the long side of the first land is defined as IA, and a distance between one long side of the first land and one long side of the chip type electric element is defined as IB, the one long side of the first land facing the chip type electric element but opposite to the one long side of the chip type electric element. The length of IA is equal to or larger than the distance of IB.

Abstract: An air flow measurement device measures a flow amount of air. A flow sensor is configured to output a voltage value corresponding to a given flow amount of the air. A temperature sensor is configured to output temperature of the air. A correction coefficient memory portion is configured to store a correction coefficient for correcting the voltage value of the flow sensor to a corrected voltage value associated with the given flow amount based on a predetermined standard temperature. A relationship between the voltage value of the flow sensor and the flow amount of the air changes based on temperature of the air. A correction portion is configured to correct the output voltage value of the flow sensor to the corrected voltage value using the correction coefficient.

Abstract: A stroke amount detecting device includes a magnetism detecting unit, a first magnetic field generating unit and a second magnetic field generating unit. A magnetic pole of the first generating unit and a magnetic pole of the second generating unit, which are opposed to each other, have different polarities. A distance between a gap end of the first generating unit and a gap end of the second generating unit, which are located on a farther side of a rectilinear axis, is smaller than a distance between an open end of the first generating unit and an open end of the second generating unit, which are located on a closer side of the rectilinear axis. The magnetism detecting unit detects a stroke amount of an object based on a magnetic flux generated between the open end of the first generating unit and the open end of the second generating unit.

Abstract: A rotation angle detecting unit includes an IC package having a magnetism detecting element, a sealing body, and leads; and a covering member having a fixing part and a supporting part, which are integrally formed from resin. The element outputs a signal according to change of a magnetic field generated upon rotation of a magnetism generating device attached to a detection object. The sealing body covers the element. The leads are connected to the element, and project from the sealing body. The fixing part is fixed to a supporting body so that the covering member is attached to the supporting body. The supporting part supports the package such that the element can output the signal. The package is press-fitted into the supporting part after its formation, so that the package is supported by the supporting part with a predetermined pressure applied to part of an outer wall of the sealing body.

Abstract: A sensor module includes a sensor, a cover, and a wiring unit. The cover holds the sensor and includes a connector configured to make a connection with an external device. The wiring unit is held by the cover, is arranged from the connector to the sensor, and includes a connecting member extending from the connector to a central region of the cover in its width direction, which is perpendicular to the central line, and a wiring member extending from the central region of the cover in its width direction to a vicinity of the sensor. The cover and connecting member are integrally formed from a mold material. The connecting member includes a first connecting terminal exposed from a surface of the mold material at the central region of the cover in its width direction. The wiring member includes a second connecting terminal conductively joined to the first connecting terminal.

Abstract: A rotation angle sensor includes a housing, a detected object, a magnetism generation section, a housing cover, a circuit substrate, a sensing IC, and a resin body. The sensing IC includes a magnetism detection element, a molded body, and leads. The magnetism detection element outputs a signal in accordance with a change in a magnetic field due to a rotation of the detected object. The molded body covers the magnetism detection element. One end portion of each lead is electrically coupled with the magnetism detection element and the other end portion of each lead protrudes from the molded body and is electrically coupled with the circuit substrate. The resin body seals a portion of the molded body located between the magnetism detection element and the housing cover, the leads, and the circuit substrate.

Abstract: In a rotation angle detecting device, a signal from a first magnetism detecting element is outputted to a signal output part of a first IC package. A first signal output terminal outputs the signal from the first magnetism detecting element to outside. A signal from a second magnetism detecting element is outputted to a signal output part of a second IC package. A second signal output terminal outputs the signal from the second magnetism detecting element to outside. At least one of a power supply terminal and a ground terminal is located between the first and second signal output terminals. A rotary drive unit includes the device, a motor that rotates a detection object, and a motor power source wire. The ground terminal and a motor power source terminal are adjacent to each other.

Abstract: A rotation angle detection device has a first yoke, an inside surface of which is formed of a first concave curved surface and a second concave curved surface, and a second yoke, an inside surface of which is formed of a third concave curved surface and a fourth concave curved surface. Each concave curved surface does not extend in a second direction but extends toward a first flat surface or a second flat surface in an inclined manner. The first flat surface and the second flat surface face each other sandwiching a Hall element therebetween and are parallel to each other. The magnetic flux, which leaks from the first yoke into an inside space and reaches the second yoke, flows in the second direction over a wider area around the Hall element.

Abstract: A position detector includes a Hall element that detects a magnetic flux density and a temperature detection element that detects the temperature of the Hall element. In a rotation angle calculation process, a temperature correction value a is calculated by substituting a detection temperature t of the temperature detection element and a reference maximum voltage V0 at a reference temperature t0 for a=V0×k (t?t0). Next, a correction maximum voltage Vt is calculated by substituting the temperature correction value a for a temperature characteristic formula of Vt=V0+a. Further, a rotation angle ? of a magnet relative to the Hall element is calculated by substituting an output voltage VH of the Hall element and the correction maximum voltage Vt for ?=sin?1 (VH/Vt). Since the correction maximum voltage Vt is corrected according to the temperature, the rotation angle is accurately detected.

Abstract: A position detection apparatus includes a magnetic generator, a magnetic detector, a storage, and a rotation angle calculator. The rotation angle calculator calculates a relative rotation angle of the magnetic generator with respect to the magnetic detector based on a voltage output from the magnetic detector and a relational expression of ?=sin?((VH?c)/V0)?b. In the relational expression, the relative rotation angle is defined as ?, the voltage output from the magnetic detector is defined as VH, a true maximum value of the voltage output from the magnetic detector is defined as V0, a first true correction value is defined as b, and a second true correction value is defined as c.

Abstract: A rotation angle detection device includes a magnetic field generation section, a yoke, and a magnetism detection section. The magnetic field generation section has a first end portion and a second end portion. The yoke has such a tube shape that the magnetic field generation section and a rotation axis of a rotating body are located therein. The yoke has a gap at a part in a circumferential direction in a cross section perpendicular to the rotation axis. The magnetism detection section is disposed in the gap and outputs an electrical signal in accordance with a magnetic field strength in the gap. The magnetic field generation section is disposed in such a manner that a magnetic force line passing through the magnetic field generation section passes through the rotation axis regardless of the rotation angle of the rotating body and the rotation axis passes through the first end portion.

Abstract: A rotation angle detector is provided with a frame-shaped yoke which includes a first wall and a second wall in parallel. A rotation axis of a detection subject extends inside of the frame-shaped yoke. A magnetic flux vector is uniformed in a direction orthogonal to the first wall, whereby even if a position of a Hall element deviates, the detected magnetic flux density is less varied. A robustness of the detector is enhanced. A distance between the Hall element and a second inner surface of the second wall is shorter than that between the Hall element and a first inner surface of the first wall. A length of the second inner surface is longer than a length of the first inner surface. At a vicinity of the second wall, the area in which the magnetic flux vector is uniformed can be enlarged. Thus, the robustness is further enhanced.

Abstract: A stroke amount detection device includes a yoke, a magnetic flux generation section, and a magnetism detection section. The yoke has a protruding section that protrudes to outside the yoke. The magnetic flux generation section is located in the yoke. The magnetism detection section is disposed between the magnetic flux generation section and the protruding section. The magnetism detection section is disposed at a fixed position with respect to the magnetic flux generation section. The magnetism detection section outputs a signal in accordance with a magnetic flux density generated due to a relative movement of the yoke with respect to the magnetism detection section.

Abstract: An air flow measurement apparatus includes an air flow sensor for outputting an air flow signal indicative of detected air flow, a reference voltage generator for outputting reference voltage signals, a multiplexer for sequentially selecting the signals in a predetermined order, an A/D converter for converting the signals into digital data in an order selected by the multiplexer, and a signal processing unit for applying correction processing to air flow voltage data corresponding to the air flow signal using reference voltage data corresponding to the reference voltage signals. The signal processing unit has a sampling timing setting section for determining sampling timings at which the A/D converter samples the signals in such a manner that the sampling timing at which the air flow signal is sampled is interposed between the sampling timings at which successive two of the reference voltage signals are sampled.

Abstract: A movement detection unit detects a movement of a detected object and outputs a voltage signal to an electronic control unit. A buffer unit implements buffer amplification on the outputted voltage signal. A pull-up resistor element or a pull-down resistor element is connected with the buffer unit via a wiring portion. A current detection unit detects a direction of an electric current flowing through the wiring portion to output a safe specific voltage signal to the electronic control unit on disconnection of the wiring portion. A power-supply-voltage detection unit detects decrease in a power supply voltage applied to the movement detection unit. A voltage switching unit sets the voltage signal, which is outputted to the electronic control unit through the wiring portion, on a high-voltage side or a low-voltage side according to the detected direction of the electric current, on detection of decrease in the power supply voltage.

Abstract: A magnetic sensing surface of a stroke sensor is placed in an angular range between a first imaginary line and a second imaginary line. The first imaginary line is an imaginary line that coincides with a center line between first and second magnets of a magnetic movable body when a wastegate valve is placed to have a full close degree of the wastegate valve. The second imaginary line is an imaginary line that coincides with the center line between the first and second magnets when the wastegate valve is placed to have a half degree between the full close degree and a full open degree of the wastegate valve.

Abstract: A magnetic detection apparatus includes an IC device, a casing defining a housing space of the IC device, and a resin mold portion arranged on a first part of an outside surface of the casing. The IC device includes an IC package having a built-in magnetoelectric transducer, and lead wires. The housing space is defined by a second part of an inner wall of the casing. A predetermined portion of the second part of the inner wall is defined as a contact region, with which the IC device contacts. The resin mold portion is arranged other than a predetermined portion of a second part of the outside surface corresponding to the contact region. A position of the magnetoelectric transducer is determined by positions of the contact region and the resin mold portion.