Abstract: A first drive member which rotates with a rotor includes a first cam portion and a second cam portion, and a second drive member which connects a drive pin with a shutter blade includes a first cam portion and a second cam portion. A circular hole of the link member is fitted to a shaft member which is fixed to the first drive member and an elongated hole thereof is fitted to the shaft member fixed to the second drive member. The first drive member rotates the second drive member first via the link member and subsequently rotates the same directly so that when an abutting portion of the second drive member comes into abutment with an edge of the elongated hole, a generated repulsive force acts toward an axis of rotation of the first drive member irrespective of the direction of rotation of a rotor 7.

Abstract: A magnetic head and disk tester comprises a base, a spindle for rotationally supporting a magnetic disk, a carriage for supporting a magnetic head support which carries a magnetic head with a magnetic read/write element, and a dual-stage positioning system that moves the carriage in two perpendicular directions X and Y. The magnetic head support, the magnetic head and the magnetic read/write element have a common longitudinal axis Z. The head support is positioned such that the longitudinal axis Z forms a predetermined angle between 0° and 90° with respect to the Y direction. Preferably the predetermined angle is about 45 degrees. When the head is driven from one point of an inner track to a point of an outer track, the displacement of the head along X axis is relatively large and the displacement of the head along Y axis is relatively small.

Abstract: A magnetic sensor, system and method include a magnet located proximate to a target comprising a plurality of teeth and a plurality of slots formed therebetween. An integrated circuit is located on a side of the magnet wherein the integrated circuit comprises a plurality of magnetoresistive bridge components. The integrated circuit and the magnet are configured into a sensor package, such that the magnetoresistive bridge components enable the detection of a target tooth when one half of the plurality of magnetoresistive bridge components come into proximity with an edge of a tooth before that of another half of the magnetoresistive bridge components as the tooth and an associated slot thereof pass by the sensor package.

Abstract: A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the field. A positional relationship between the receiver and the device is monitored using the output. In one aspect, changing the positional relationship, by moving the device nearer to a boring tool which supports the receiver, causes an increase in accuracy of depth determination. In another aspect, determination of an actual overhead position of the boring tool, and its application, are described. Use of a plurality of measurements over at least one-half revolution of each magnet is disclosed. Establishing a surface radial direction toward a boring tool and resolution of multi-valued parameters is described. Calibration techniques, as well as a three transmitter configuration are also described.

Abstract: A position detecting device has a movable unit, and a hold unit that movably holds the movable unit. One of the movable unit and the hold unit has a magnetic field generator having an engaged portion and a guide opening. A magnetic field sensor is provided on the other unit of the movable unit and hold unit. The sensor senses the magnetic field so as to detect the position of the movable unit relative to the hold unit. The magnetic field generator is fixed to the first surface after the magnetic field generator is slidingly moved by a rod member inserted into the guide opening and engaged with the engaged portion so as to dispose the magnetic field generator at a predetermined position.

Abstract: The invention relates to a fluxgate micromagnetometer implemented in thin layers, fitted with at least one excitation coil with an arrangement and a structure that bring improvements particularly in terms of the magnetometer footprint, reduction in the “offsets” of measurements taken by the magnetometer, common mode rejection.

Abstract: A method for monitoring the operability of a slider of a disk drive includes the steps of providing a slider that includes a read/write head that magnetically interacts with a storage disk, and a slider mover that adjusts a head-to-disk spacing, controlling an electrical stimulus to the slider mover with a drive circuitry, measuring an actual electrical response from the slider mover with the drive circuitry, and comparing the actual electrical response to an expected electrical response to determine an operability status of the slider mover. Further, changes in the actual electrical response can be monitored and used to predict future failure of the slider mover.

Abstract: Multiple sources are provided for a transmitter cable for use in electromagnetic surveying. The transmitter cable includes a dipole antenna comprising a pair of spaced apart electrodes mounted on their respective cables. Two antennas may be powered from each source. Alternatively, the outputs of each source are connected to a common antenna pair. A single large power supply may be mounted on a vessel to supply power through the tow cable. Alternatively, a number of power supplies may be provided aboard the vessel, with each power supply having dedicated conductors through the tow cable to power the plurality of current sources.

Abstract: To provide a position detection apparatus with an expanded range of good linearity in a magnetic sensor's output characteristic with respect to position of a movable body as well as to provide a vehicle mirror angle detection apparatus using the position detection apparatus. Two permanent magnets 42 and 44 and one Hall-effect sensor 46 are used. The permanent magnets 42 and 44 are arranged with their relative position fixed. The Hall-effect sensor 46 is placed laterally to the arrangement of the two permanent magnets 42 and 44. The permanent magnets 42 and 44 and Hall-effect sensor 46 move relative to each other in a direction parallel to the arranging direction of the permanent magnets 42 and 44. Those surfaces 42a and 44a of the permanent magnets 42 and 44 which face the Hall-effect sensor 46 constitute magnetic pole faces of opposite polarity and the magnetic pole faces 42a and 44a are placed with an inward tilt.

Abstract: Disclosed herein is a lens driving mechanism which can achieve simplification of the mechanism and provision of appropriate control relating to a correction against a shake. The lens driving mechanism includes a piezoelectric element that is deformed when energized for applying driving force to the movable block and a charge amount sensor for detecting the amount of charge accumulated in the piezoelectric element. The amount of electric current to be supplied to the piezoelectric element is determined based on the external force, acting upon the movable block, which is estimated based on the difference between the amount of charge injected into or discharged from the piezoelectric element and the amount of charge accumulated in the piezoelectric element and detected by the charge amount sensor when the movable block is moved in the direction perpendicular to the optical axis.

Abstract: A magnetic sensor includes a sensing chip having a magnetoresistive element for sensing a magnetic vector and a magnet for biasing the magnetic vector sensed by the magnetoresistive element. The sensing chip senses change in the magnetic vector for detecting a behavior of a magnetic body based on a variation of a resistance value of the magnetoresistive element when biasing of the magnetic vector is caused by the magnet in cooperation with the magnetic body that is in motion in a proximity of the sensing chip, and the magnet takes a shape of a flat cylinder that houses the sensing chip in a hollow space bored therein.

Abstract: A magnetoresistive sensor system includes a plurality of chip carriers, such that each integrated circuit among the plurality of chip carriers is associated with a respective magnetoresistive sensing components. A plurality of magnetoresistive sensing components can be arranged in an array, wherein each magnetoresistive component among the plurality of magnetoresistive components is associated with a respective integrated circuit among the plurality of chip carriers and wherein the plurality of magnetoresistive sensing components comprises sensing components that are spaced irregular from one another in order to optimize the performance of the array and meet requirements of a particular magnetoresistive sensing application.

Abstract: A ball and socket joint with integrated angle sensor, especially for use as a vehicle level control in the chassis of a motor vehicle. The ball and socket joint has a ball and socket joint housing (1), a ball pivot (2) mounted in the ball and socket joint housing (1), a bipolar field transducer (4) arranged at the joint ball (3) of the ball pivot (2), and at least one magnetic field direction sensor (5), which is arranged at the ball and socket joint housing (1) and interacts with the magnetic field generated by the field transducer (4), wherein only one pole of the bipolar field transducer (4) is arranged on the surface of the ball.

Abstract: An instrument (10) for measuring three-dimensional motion in a living body comprises a plurality of magnetism generators (12i) fixed to one of at least two objects (44, 46) moving relatively in the living body, a plurality of magnetic field sensors (14j) fixed to the other object in order to perform noncontact detection of the magnetic field of each magnetism generator (12i), and a signal processing means (26) for calculating relative position and direction between each magnetism generator (12i) and each magnetic field sensor (14j) according to a magnetic field detected by each magnetic field sensor (14j). The number of magnetism generators (12i) and magnetic field sensors (14j) is at least five, respectively.

Abstract: Tracking a boring tool is performed within an underground region using a locating signal. The boring tool is moved through the ground during a series of distance movements such that potential movement of the boring tool during any one of the distance movements is less than a maximum movement value. A current positional relationship is determined for a current one of the distance movements based on: a last-determined positional relationship established for an immediately preceding one of the distance movements, certain orientation parameters, the maximum movement value and the determined signal strength of the locating signal in the current positional relationship. Target coordinates are accepted and a target position, based on the target coordinates, is included as part of the current positional relationship. The position of the target is unconstrained with respect to system geometry. Steering command features are provided along with steering warnings.

Abstract: A device for detecting the linear and angular positions of a moving element such as a gearchange finger in a motor vehicle gearbox, the moving element carrying at least one permanent magnet that is movable past a printed circuit card mounted on a stationary support and carrying magnetoresistance cells. The invention enables the transmission ratio engaged in a gearbox to be detected continuously.

Abstract: A magnetic bias film 9 includes a magnetic bias magnet 11 that has magnetic layers and generates a magnetic field within a plane perpendicular to a lamination direction of the magnetic layers, which is manufactured in the shape of substantially a rectangular prism having a long side, a short side, and a thickness (in the lamination direction) in order of decreasing lengths. A ratio of the long side with respect to the short side of the magnetic bias magnet 11 in length is in a range of 5 to 200.

Abstract: The present invention provides a magnetic sensor suitable for high resolution and having high reliability by achieving stable output even at the occurrence of variations in a gap between a magnetic medium and the magnetic sensor, and a magnetic encoder using the magnetic sensor. The present invention uses a magnetoresistive element having magnetoresistive properties that satisfy the inequation, H10?50<H50?90, where H10?50 represents a magnetic field required for a resistance change from ?R×10% to ?R×50% with respect to a maximum amount of resistance change ?R on a magnetoresitance effect curve, and H50?90 represents a magnetic field required for a resistance change from ?R×50% to ?R×90%.

Abstract: Apparatus and methods for inspecting materials such as cylindrical and tubular members are disclosed. One apparatus includes a frame that supports a magnetic coil and a detector assembly, the detector assembly having one or more magnetic detectors adapted to be spaced a first distance from the material being inspected by one or more substantially frictionless members. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims.

Abstract: A downhole tool for formation logging includes a tool body configured to move in a borehole; and at least one sensor module mounted in at least one mounting location on the tool body, wherein the at least one sensor module is interchangeable with other sensor modules that make different measurements. A downhole tool may further comprise a measurement system disposed in the tool body, wherein the measurement system is operatively coupled to the at least one sensor module.