2047 results about "Hall element" patented technology

An AF unit of a lens holder driving device includes a lens holder, a focusing coil, a permanent magnet having a plurality of permanent magnet pieces having first surfaces opposed to the focusing coil, a magnet holder holding the permanent magnet, and first and second leaf springs supporting the lens holder in a direction of an optical axis shiftably. An image stabilizer portion includes a fixed portion disposed near the second leaf spring, a supporting member swingably supporting the AF unit with respect to the fixed portion, an image stabilizer coil having a plurality of image stabilizer coil portions disposed so as to oppose to second surfaces of the plurality of permanent magnet pieces that are perpendicular to the first surfaces, and a plurality of Hall elements. Each Hall element is disposed at a position where the image stabilizer coil portion is separated into a plurality of coil parts.

The tri-axis close-loop feedback controlling module for electromagnetic lens driving device comprises a 6-pin Hall element. Two pins of the Hall element are coupled to an auto-focus module for providing a current to drive the auto-focus module to conduct auto-focusing operations along the Z-axis; while other four pins of the Hall element are coupled to a control unit. The control unit detects the X-Y axial positions of the auto-focus module relative to an OIS module and generates a control signal which is then sent to the Hall element. Therefore, the Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can drive the auto-focus module based on the control signal corresponding to the X-Y axial positions of the auto-focus module, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.

A chopped Hall effect sensor topology includes a switched Hall plate, an amplifier responsive to an output of the switched Hall plate and a filter stage responsive to the output of the amplifier and including an anti-aliasing filter and a selective filter that is tuned to the modulation frequency. The switched Hall plate includes a Hall element and a Hall plate modulation circuit that modulates the Hall offset signal component or the magnetic signal component. In embodiments in which the Hall offset signal component is modulated by the switched Hall plate, the amplifier, if chopped, includes an even number of additional modulation circuits. In embodiments in which the magnetic signal component is modulated by the switched Hall plate, the amplifier contains an odd number of modulation circuits. The described topology provides a low noise, fast response time Hall effect sensor.

A chopped Hall effect sensor topology includes a switched Hall plate, an amplifier responsive to an output of the switched Hall plate and a filter stage responsive to the output of the amplifier and including an anti-aliasing filter and a selective filter that is tuned to the modulation frequency. The switched Hall plate includes a Hall element and a Hall plate modulation circuit that modulates the Hall offset signal component or the magnetic signal component. In embodiments in which the Hall offset signal component is modulated by the switched Hall plate, the amplifier, if chopped, includes an even number of additional modulation circuits. In embodiments in which the magnetic signal component is modulated by the switched Hall plate, the amplifier contains an odd number of modulation circuits. The described topology provides a low noise, fast response time Hall effect sensor.

A magnetic sensor includes: a substrate; a semiconductor region; a magnetic field detection portion; a pair of first electrodes; and two pairs of second electrodes. One pair of second electrodes includes first and second terminals, and the other pair includes third and fourth terminals. The first and third terminals are disposed on one side, and the second and fourth terminals are disposed on the other side. The first and fourth terminals are electrically coupled, and the second and third terminals are electrically coupled. The magnetic field detection portion and the first and second electrodes provide a vertical Hall element. One of the first and second electrodes supplies a driving current, and the other one detects the Hall voltage.

A magnetic field sensor for measuring a direction of a magnetic field in a plane comprises a sensing structure comprising a ring-shaped well, a plurality of contacts of equal size placed at equal distance from each other along the ring-shaped well, and an electronic circuit comprising a plurality of electronic switches associated with the contacts of the sensing structure, a logic block for controlling the electronic switches, at least one current source, a means for measuring a difference between a first voltage and a second voltage, a timing circuit providing a control signal for controlling the logic block and providing a reference signal, wherein the logic block is adapted to close and open the electronic switches under the control of the control signal according to a predetermined scheme such that a predetermined number of contacts of the plurality of contacts form a vertical Hall element that is supplied with current from the at least one current source and that has two contacts connected to the means for measuring, and such that the vertical Hall element is moved in steps along the ring-shaped well, and a means for measuring a phase shift between the reference signal and an output signal of the voltage measuring means.

The present invention provides a current measuring apparatus having an improved structure to inhibit the possible adverse effect of a current in a different phase and the possible generation of an induced electromotive force caused by a measurement target current, enabling the measurement target current to be accurately detected even with the small size of the apparatus. The current measuring apparatus includes a printed circuit board 1 having Hall elements 2a, 2b and a signal processing integrated circuit 3 mounted thereon, the Hall elements 2a, 2b sensing a magnetic field generated by a current flowing through a current measurement target bus bar 4a, the signal processing integrated circuit 3 processing sensing outputs from the Hall elements 2a, 2b to calculate a value for the current flowing through the bus bar 4a. Magnetic sensing surfaces of the Hall elements 2a, 2b are arranged substantially perpendicularly to the direction of the magnetic field generated by the current flowing through the bus bar 4a. Further, the printed circuit board 1 is fixed to the bus bar 4a so that a circuit board surface of the printed circuit board 1 having a wire electrically connecting the Hall elements 2a, 2b to the signal processing integrated circuit 3 is positioned substantially parallel to the direction of the magnetic field.

A magnetic linear displacement sensor. In accordance with one embodiment, the displacement sensor includes a Hall transducer element having a sensor plate surface and at least one magnet having a lengthwise dimension along which said Hall element detects a magnetic field component orthogonal to the sensor plate surface during displacement sensing. The magnet includes first and second pole faces disposed on opposite lengthwise sides thereof and a polarization axis aligned orthogonally with respect to the lengthwise dimension. The first pole face opposes the Hall, element and is characterized as having a non-planar surface contoured to generate a substantially linear orthogonal magnetic field component sensed by said Hall element during linear displacement sensing.

A magnet is provided to one of two members, which make relative rotation therebetween. First and second Hall elements are arranged adjacent to each other and are provided to the other one of the two members. A magnetic sensing surface of the first Hall element is generally perpendicular to a magnetic sensing surface of the second Hall element, and a relative rotational angle between the two members is determined through the first and second Hall elements based on a magnetic flux, which is generated by a magnetic flux generating portion of the magnet and passes through the first and second Hall elements toward a magnetic flux attracting portion of the magnet.

A current detector having a linear conductor 111, 112, a linear to-be measured conductor 10 disposed substantially in parallel to the conductor 111, 112 and through which a to-be measured current flows. A Hall element 20 disposed in the vicinity of the to-be measured conductor 10 such that a magnetic flux generated by the to-be measured current flowing through the to-be measured conductor 10 enter into a magnetic-force sensing face 21 substantially perpendicularly. A substrate 30 for supporting the conductor and the to-be measured conductor 10 such that the magnetic flux generated by a current flowing through the conductor becomes substantially parallel to the magnetic-force sensing face +21 in the magnetic-force sensing face 21 of the Hall element 20.

The invention relates to a pressure-sensitive handwriting pen, which comprises a continuous quantity pressure sensor arranged in a pen point and a front-end adapter circuit, a signal conditioning circuit and an output unit for outputting wired or wireless signals which are matched with the pressure sensor, wherein the continuous quantity pressure sensor has a unique mapping relationship between an output value and pressure. The pressure-sensitive handwriting pen can use a resister strain foil, a Hall element, an electret capacitor or an electret microphone, a variable capacitor and a variable inductor as a pressure sensor element, and aiming at handwriting light pens and handwriting ultraphonic pens, provides an implementation scheme that by utilizing the conventional infrared transmission unit on a handwriting pen, handwriting pressure data and the original signal system are integrated to transmit pressure data. By applying the pressure-sensitive handwriting pen, on one hand, the change of calligraphy is more abundant and is closer to natural writing, and on the other hand, the application of handwritten input products on aspects of calligraphy, painting and the like and particularly the pressure-sensitive handwriting on display screens is expanded. Various sensors used by the pressure-sensitive handwriting pen have the advantages of low cost and simple adapter circuit, and thus the pressure-sensitive handwriting pen is suitable to be popularized and used.

An image stabilizer can steady blurry images. The image stabilizer includes first and second Hall elements and a yoke with a magnet fixed thereto, the yoke including a projected portion to escape magnetic flux from the edge portion of the magnet. In the state in which one of magnets and a coil supporting holder are fixed to a moving frame and in which the optical axis of the correcting lens is matched with the optical axis of the lens system, the first and second Hall elements are moved to the first and second directions so that the first and second Hall elements are properly positioned at the positions in which magnetic force received by the two Hall elements from the magnet becomes a reference value, whereafter the other of the magnets and the coil supporting member are fixed to a supporting frame.

The present invention provides a single component implementing highly precise pulse detection for rotational or liner position detecting apparatuses for jog dials and mechanical products. Focusing on the fact that the phase difference between the magnetic fields in circumferential and radial directions generated by a magnetized ring is precisely 90 degrees, a position detecting apparatus of the present invention includes two Hall elements placed at a distance; a protective film provided on magnetic sensitive portions of the two Hall elements to cover the magnetic sensitive portions; a thin-film magnetic plate placed on the protective film to cover the magnetic sensitive portions of the two Hall elements; and further a processing circuit calculating the sum and difference of the signals from the two Hall elements to generate signals having an accurate phase difference of 90 degrees. The position detecting apparatus can therefore detect the rotation direction and precise rotation angle.

The motor drive circuit 100 supplies a drive current to the motor 2 to drive the motor. Each of the first Hall amplifier HAMP1 to the third Hall amplifier HAMP3 is provided for each phase of the motor 2 and receives a pair of Hall signals from a corresponding phase Hall element to generate each phase sine wave voltage SIN_U, SIN_V and SIN_W by amplifying a difference between the pair of Hall signals. Each of the first PWM comparator PCMP1 to the third PWM comparator PCMP3 is provided for each phase of the motor 2 and compares the corresponding phase sine wave voltage SIN_U, SIN_V and SIN_W with the periodic voltage Vosc to generate each phase PWM signal PWM_U, PWM_V and PWM_W. The drive unit 10 subjects a phase coil, a target to be driven, to pulse drive by using the pulse modulated signal from the corresponding PWM comparator.

A magneto-sensitive integrated circuit which amplifies a magneto-sensitive output voltage of a Hall element by an amplifier to generate an amplified voltage, converts an output voltage of the amplifier into a digital signal by an A / D converter; and generates a reference voltage of magnitude corresponding to an indicated value. The amplifier includes voltage superposition means which superposes a DC voltage corresponding to the reference voltage on the amplified voltage to generate the output voltage of the amplifier.

A rotation angle measurement apparatus includes: a first Hall element pair for detecting a magnetic component in a first direction; a second Hall element pair for detecting a magnetic component in a second direction different from the first direction; a third Hall element pair for detecting a magnetic component in a third direction different from the first direction and the second direction; and a fourth Hall element pair for detecting a magnetic component in a fourth direction different from the first to third directions. An angle calculation unit calculates a first rotation angle θ of a rotating magnet based upon the strengths of the output signals from the first Hall element pair and the second Hall element pair, and calculates a second rotation angle θc of the rotating magnet based upon the strengths of the output signals from the third Hall element pair and the fourth Hall element pair.

The invention discloses a kind of current sensor, the character lies in: the feedback windings in the two symmetrical channels are connected in series, one end is accessed to the ground, the other end is accessed to one end of the sample resistance; the output of the symmetrical Hall elements are amplified, then carries on filter, voltage-current transform, current amplifying process, the output end is accessed to another end of the sample resistance, the detected voltage signal detected at two ends of the sample resistance; it also includes Rogowski coil, the two ends of the coil are connected in parallel to the sample resistance, the detected voltage signal of sample resistance is amplified, filtered and integral amplified, and transmitted to the computer; the computer process the data and transmits the detected current to the monitor to be displayed; the precision is higher than 0.5%. The power consumption is small, the temperature additional error is less than 0.1% / 10 degrees centigrade, the structure is simple, and easy to be assembled, debugged and maintained.

A Hall-effect sensor, wherein a Hall element is disposed in a magnetic path being formed by a magnet and a flux guide, and the magnet, flux guide, and Hall element are integrally held with a molded frame, and the Hall element is fixed to the magnet (or flux guide) or the molded frame. This Hall-effect sensor can easily position the Hall element with higher sensitivity.

An azimuth measuring device capable of calibrating a magnetic sensor without putting load on a user is provided. When a point having amplified output values Sx, Sy, Sz after a sensitivity correction as x, y, z components is arranged on an xyz coordinate system, an offset information calculation section 8 calculates the center coordinates of such a sphere whose surface is located in the vicinity of each point and calculates an x component of the center coordinates of this sphere as a current offset Cx of an x-axis Hall element HEx, a y component of the center coordinates of this sphere as a current offset Cy of a y-axis Hall element HEy and a z component of the center coordinates of this sphere as a current offset Cz of a z-axis Hall element HEz. It is thereby possible to calibrate the magnetic sensor without putting load on the user.

The invention discloses a method for positioning a permanent magnet synchronous motor rotor initial position. Firstly a motor is started by a square wave drive mode and rotor position information detected by a hall element, then sine wave drive is started, and number of pole-pairs of the motor is positioned. By means of the method for positioning the permanent magnet synchronous motor rotor initial position, the full automation of the motor from starting to operating can be achieved, external force or manual starting is not required, simultaneously the method is simple, and the accuracy is high.

The invention relates to an intelligentized traffic isolation system. The structure of the system comprises a remote control center and a self-driven movable isolation fence with a central processor and a wireless communication module, the structure of the self-driven movable isolation fence also comprises a group of movable bases with wheels and wheel-driving mechanisms and a group of movable stakes, and the movable stakes are connected by means of connecting rods and arranged on the bases. The intelligentized traffic isolation system is characterized in that: the structure of the system also comprises an accurate positioning mechanism, the accurate positioning mechanism comprises a group of spikes with magnets as references, the spikes are arranged on a road traffic marking, a pair of Hall elements are symmetrically arranged on the left and the right ends in each base, and based on the structure, the intelligentized traffic isolation system can be accurately positioned after a roadway is adjusted according to need. An intelligent median strip for easy-to-jam intersections is provided, the isolation fence can be automatically adjusted and moved, and not only is the tidal functional adjustment of urban roads realized to solve the problem of urban road jams in rush hours, but also the heavy work of the road administration department can be reduced.

A cooling system is provided with a motor drive device, a fan motor, and a Hall element. The motor drive device includes a lock protection circuit and a lock controller. When a control signal instructing rotation of the fan motor that is to be driven instructs stoppage of the motor for a predetermined time-period or longer, the lock controller has the lock protection circuit inactive. At an occasion when the control signal has continued to instruct stoppage of the fan motor for a first time-period or longer, a standby controller starts time measurement, and after a further predetermined second time-period has elapsed, makes at least a part of the motor drive device transition to a standby mode.

An azimuth measuring device capable of calibrating a magnetic sensor without putting load on a user is provided. When a point having amplified output values Sx, Sy, Sz after a sensitivity correction as x, y, z components is arranged on an xyz coordinate system, an offset information calculation section 8 calculates the center coordinates of such a sphere whose surface is located in the vicinity of each point and calculates an x component of the center coordinates of this sphere as a current offset Cx of an x-axis Hall element HEx, a y component of the center coordinates of this sphere as a current offset Cy of a y-axis Hall element HEy and a z component of the center coordinates of this sphere as a current offset Cz of a z-axis Hall element HEz. It is thereby possible to calibrate the magnetic sensor without putting load on the user.

A magnetic field sensor includes a circular vertical Hall (CVH) sensing element and at least one planar Hall element. The CVH sensing element has contacts arranged over a common implant region in a substrate. In some embodiments, the at least one planar Hall element is formed as a circular planar Hall (CPH) sensing element also having contacts disposed over the common implant region. A CPH sensing element and a method of fabricating the CPH sensing element are separately described.

A device for measuring current comprises a magnetic field sensor for measuring the magnetic field produced by a current I flowing through a current conductor and a yoke of a magnetic material with a relative permeability of at least 100. The magnetic field sensor preferably comprises a semiconductor chip with at least one Hall element and an electronic circuit for the operation of the Hall element. The yoke consists of an oblong piece of sheet metal or a laminate of sheet metals with two ends, that has been brought by bending into a form in which the front sides of the ends of the yoke face each other and are separated by an air gap. The ends of the yoke may be flush, tapered, or flayed relative to the width of the yoke.

The invention discloses an over-360-degree-angle limit sensor device, which consists of a support disc, an inner shifting rod, a slip ring, an outer shifting rod, a return spring, a slider, a steel magnet, Hall elements and a shifting block, wherein the inner shifting rod is fixed on the support disc; the outer shifting rod is fixed on the slip ring; the return spring, the slider and the steel magnet are mounted in the slip ring; a pair of Hall elements is ranged on a measured rotor part; and the shifting block is arranged on a tested stator part. When the limit sensor device provided by invention is arranged at the limit position of the null point and the terminal point of a mechanical device with a rotary angle of 360 degrees required to be detected, the rotary angle of the mechanical device successfully reaches or exceeds 360 degrees, and the available rotary angle has no mechanical dead angle generated by the physical sizes of the sensor; and thus, the quick and accurate positioning of the mechanical devices such as the antenna turntable in the horizontal direction is guaranteed.