[특허]Hall-effect array for sensing second spatial derivative of magnetic field

Hall-effect array for sensing second spatial derivative of magnetic field 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01B-007/14 H01L-043/06 H03K-017/90 H03K-019/18
출원번호	US-0849364 (1986-04-08)
발명자 / 주소	Van Antwerp Joel C. (Frisco TX) Harris Larry L. (Coppell TX)
출원인 / 주소	TRW Inc. (Redondo Beach CA 02)
인용정보	피인용 횟수 : 26 인용 특허 : 0

초록 ▼

Hall-effect position sensor apparatus is disclosed which senses the position of a moving body and provides an output signal indicative of the position of the moving body. The apparatus includes a predetermined number of Hall-effect sensors which are positioned in a straight line and in operating proximity to a moving body made of a ferromagnetic material. A permanent magnet is operatively positioned such that the Hall-effect sensors lie in the magnetic field produced by the magnet while the moving body provides a portion of the path comprising the magnetic excitation circuit with the permanent magnet. The moving body includes portions devoid of ferromagnetic material, which causes a change in the magnetic field. The Hall-effect sensors sense the absolute value of the magnetic field and because of their particular physical alignment and separation, together with the unique interconnection of their individual electrical outputs, provide signals to amplifier devices which represent the second time derivatives of the magnetic field sensed by the Hall-effect sensors. The electrical outputs of the amplifier devices are provided to a Schmitt trigger comparator which performs the analog to digital conversion of the input signals and provides a digital logic output signal which provides a reference point with respect to the location on the moving body, of the void which causes the change in the magnetic field.

대표청구항 ▼

For use in determining the position of an object that is movable along a displacement path and has associated with it a magnetic field that varies cyclically in strength along the displacement path, apparatus for sensing the second derivative of the strength of the magnetic field with respect to displacement along the path, the apparatus comprising: first, second, third and fourth magnetic field sensors respectively located at four consecutive points along said path, wherein each sensor produces an electrical signal proportional to the magnetic field strength at its location, and the spacing between the consecutive points is selected to be small in relation to the distance corresponding to the maximum cyclic change in magnetic field strength along the displacement path, and to provide a measurement of at least two adjacent increments of change in magnetic field strength along said path; first, second, third and fourth sensor circuits, connected to the first, second, third and fourth sensors, for producing first, second, third and fourth output signals proportional to the electrical signals from the first, second, third and fourth sensors, respectively, such that, when said magnetic field is the same at the locations of all four sensors, the first and fourth output signals have one polarity and the second and third signals have the opposite polarity; a summing circuit for producing a sum signal proportional to the algebraic sum of the instantaneous values of the four output signals, whereby the sum signal represents the instantaneous value of the second derivative of the magnetic field strength with respect to displacement along said path.

이 특허를 인용한 특허 (26)

Kunde John ; Frederick Gary, 360 degree shaft angle sensing and remote indicating system using a two-axis magnetoresistive microcircuit.
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Zandman Michael, Articles of clothing incorporating magnets for therapeutic purposes.
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Walter William, Circuitry and method for sensing spatial transitions sensed with a magnetic sensor.
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Becker Helmut (Nuremberg DEX), Device comprising at least one magneto-resistor contained in a housing.
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Koski, Jack P.; Simmons, Heidi L., Directional speed sensing systems and methods.
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Haigh Geoffrey T. ; Nickson Paul R., Directionally independent magnet sensor.
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Baer, Richard L.; Hajati, Arman, Electronic device including spaced apart hall effect sensor based haptic actuator driving and related methods.
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Ichikawa Minoru (Owariasahi JPX) Kashiyama Kotaro (Inuyama JPX) Imaeda Yukihiro (Inuyama JPX), Flow detector.
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van Veldhoven, Robert Hendrikus Margaretha, Magnetic field sensor for sensing rotation a reference component about the axis of rotation that is independent of alignment between the axis of rotation and the sensors.
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Plagens Mark R. (Richardson TX), Magnetic sensor circuit with two magnetically sensitive devices.
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Schaaf, Oliver, Method for contactless measurement of a relative position by means of a hall sensor.
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Satake, Toshikazu; Ishii, Hiroyuki, Motor driving circuit and method, and cooling device and electronic apparatus using the same.
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Raymond C. Franke, Railway code following apparatus.
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Schneider Matthew L. ; Monette William A., Redundant sensor apparatus for determining engine speed and timing values.
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Matsuzaki, Kazunari; Nagase, Takashi, Rotating angle detector and apparatus thereof for detecting the rotating position of a rotor.
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Hagio, Hirofumi; Hamaoka, Takashi; Kono, Yoshiyuki; Kubota, Takamitsu; Kondo, Tomokazu, Rotation angle detector having sensor cover integrating magnetic sensing element and outside connection terminal.
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Hagio, Hirofumi; Hamaoka, Takashi; Kono, Yoshiyuki; Kubota, Takamitsu; Kondo, Tomokazu, Rotation angle detector having sensor cover integrating magnetic sensing element and outside connection terminal.
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Hagio, Hirofumi; Hamaoka, Takashi; Kono, Yoshiyuki; Kubota, Takamitsu; Kondo, Tomokazu, Rotation angle detector having sensor cover integrating magnetic sensing element and outside connection terminal.
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Scalf, Gerald W., Scalable code absolute logic function (SCALF) encoder.
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Riedmüller, Kurt, Sensor arrangement, integrated chip component with the sensor arrangement, and measurement method.
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Meaney,Todd, System and method for position sensing using inflection point position sensing of a sensor output.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Hall-effect array for sensing second spatial derivative of magnetic field 원문보기

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Hall-effect array for sensing second spatial derivative of magnetic field 원문보기

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이 특허를 인용한 특허 (26)

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