Sankyo Seiki Mfg. Co., Ltd

Nidec Corporation

Fusayoshi Aruga

Hiroshi Nakamura

Shogo Momose

Junichi Nakajyo

Kazutoshi Ishikawa

Mitsuo Yokozawa

Kenji Hirasawa

Katsuya Moriyama

Junichi Nakajo

To provide a linear motion and rotation detector in which a size thereof in a linear motion direction is able to be minimized. A linear motion and rotation detector () includes a cylindrical magnetic scale () that moves linearly in an axial direction (X) and rotates in a direction around an axis, a first magnetic detection element () configured to detect a linear motion position, and a second magnetic detection element () configured to detect a rotational position. The magnetic scale () includes a lattice-shaped magnetized pattern () in which S poles and N poles are alternately arranged in the axial direction (X) and S poles and N poles are alternately magnetized in the direction around the axis on a circumferential surface thereof. The first magnetic detection element () and the second magnetic detection element () are disposed to face the magnetized pattern (). Since a linear motion position and a rotational position are able to be detected using the first magnetic detection element () and the second magnetic detection element () which face the same magnetized pattern, it is unnecessary to arrange the linear motion scale and the rotational scale at different positions in the axial direction (X). Thus, an increase in size of the linear motion and rotation detector () in the axial direction (X) can be minimized.

Linear motion and rotation detector

A displacement sensor for sensing the relative position of an object to be detcted is provided. The displacement sensor includes a core body having a core center portion and core end portions that are continuously formed on both sides of the core center portion. Magnetizing coils and detecting coils are wound around the core body such that they are lined on an axis of the core body. One of the magnetizing coils and detecting coils is placed at the core center portion while the other ones of the magnetizing coils and detctin coils are placed at the core end portions in the axial direction. The width of the core end portions in the direction perpendicular to the axial direction of the core body is substantially the same and is smaller than the width of the core center portion.

Magnetic displacement sensor for sensing the position of an object

The present invention provides for a metallic surface identifying sensor including: a magnetic pole portion for detection which shifts facing a surface of a magnetic body to be identified having an uneven shape wherein the distance from the surface to be identified changes along with the uneven shape while shifting; a reference magnetic pole portion which is placed across from a reference surface, wherein the distance from the reference surface to the magnetic pole portion is maintained approximately constant regardless of the shifting of the magnetic pole portion for detection in relation with the surface to be identified; magnetizing coils which are separately wound around the magnetic pole portion for detection and the reference magnetic pole portion to generate magnetic fluxes; and detecting coils which are separately wound around the magnetic pole portion for detection and the reference magnetic pole portion to detect the magnetic fluxes wherein the uneven shape of the surface to be identified of the metallic body is detected based on detection outputs from the magnetic pole portion. The present invention also provides for a differential magnetism sensor apparatus, a coin identifying apparatus, a magnetic sensor body, a coin identifying sensor, a displacement sensor and a proximity sensor.

Coin identifying device using magnetic sensors

A technique for detecting a magnetic recording medium such as a strip on a magnetic card so as to distinguish between a case where a magnetic strip has high coercivity and one where it has low coercivity. A magnetic head detects the existence and appropriate positioning of a magnetic strip which is then fed to a permeability sensor that provides an output signal that is a function of the permeability magnetic strip. A circuit responsive to the output of the permeability sensor provides an output signal indicating the high coercivity strip when the permeability sensor output is low and indicating a low coercivity strip when the permeability sensor output is high.

Recording medium detecting apparatus for distinguishing between a recording medium having a relatively high coercivity or a relatively low coercivity

A detecting apparatus for reading the magnetic strip on a card compensates for coercivity variations by employing two magnetizing coils wound in opposite senses on the magnetic poles and two detecting coils coupled to the magnetizing coils and which are also wound in opposite sense on the magnetic poles. Differential output from the detecting coils represents a shift from normal in the coercivity or permeability of the magnetic strip so as to permit compensation for shifts due to factors such as a warped card or dust intervening thereby permitting accurately identifying whether or not the magnetic strip on the card is a high coercive force type or a low coercive force type.

Magnetism detecting apparatus and magnetic material identifying apparatus using the same

A surface profile detecting device comprises a plurality of bar-like cores disposed in a line with predetermined intervals in a predetermined disposing direction. Each core has tip ends that are arranged on a single plane and which face a surface of an object to be measured having recesses and protrusions in a magnetic field such that they are relatively movable in a direction orthogonal to said disposing direction. The detecting device also includes detecting arrangement provided in each of the bar-like cores for detecting changes in magnetic flux generated due to the uneven profile of the object to be measured. An A/D converting device is provided for A/D converting the output of the detecting arrangement with a predetermined timing. A memory is also provided for storing the output from the AND converting device. The uneven profile of the object to be measured in a predetermined range is detected from the data stored in the memory.

Growing community of inventors

Nagano, Japan

Fusayoshi Aruga