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  Rotational angle detectorUSPTO Application #: 20070188165Title: Rotational angle detector Abstract: Conductive wires run parallel to each other and connect a Hall element and an ECU. The conductive wire includes an extracting part and a wiring part. The extracting part runs along a surface of a base, on which the Hall element is positioned, and in a direction of a sensitivity of the Hall element. The wiring part extends from the extracting part and runs near a rotating crankshaft in an axial direction of the crankshaft. Similar to the conductive wire, the conductive wire includes an extracting part and a wiring part. Conductive wires run parallel to each other and connect a Hall element and the ECU. The conductive wires include an extracting part and a wiring part, and an extracting part and a wiring part, respectively. (end of abstract) Agent: Nixon & Vanderhye, PC - Arlington, VA, US Inventors: Tatsuya Kitanaka, Takashi Kawashima, Koichiro Matsumoto USPTO Applicaton #: 20070188165 - Class: 32420725 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070188165. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION [0001]This application is based on and incorporates herein by reference Japanese Patent Application No. 2006-36201 filed on Feb. 14, 2006. FIELD OF THE INVENTION [0002]The present invention relates to a rotational angle detector. BACKGROUND OF THE INVENTION [0003]A rotational angle detector (e.g., JP62-095402A), which detects a rotational angle of an object of detection based on a magnetic field that varies according to rotation of the object of detection, is conventionally proposed. In such a rotational angle detector, a magnetism detecting element (e.g., a Hall element) is rotated relative to a magnetic field generating permanent magnet in synchronization with the rotation of the object. The rotational angle detector thus detects the rotational angle of the object based on an output signal of the magnetism detecting element. The output signal corresponds to a rotating magnetic field, which accompanies the rotation of the permanent magnet relative to the magnetism detecting element. [0004]However, in the above rotational angle detector, inductive noise due to the rotating magnetic field overlaps with the output signal of the magnetism detecting element. The inductive noise is caused by induced electromotive force, which is generated in a circuit formed by conductive wires for transmitting the output signal when the magnetic field varies according to the rotation of the object. As a result, a detection error increases when the rotational angle detector detects the rotational angle. SUMMARY OF THE INVENTION [0005]The present invention addresses the above disadvantages. Thus, it is an objective of the present invention to provide a rotational angle detector, which has a relatively small detection error due to inductive noise. [0006]To achieve the objective of the present invention, there is provided a rotational angle detector for detecting rotation of a detection object. The rotational angle detector includes a magnetic field generating device, a magnetism detecting element, a pair of conductive wires, and an electronic device. The magnetic field generating device generates a magnetic field. The magnetism detecting element is positioned in the magnetic field and outputs an output signal in correspondence with variation in the magnetic field caused by rotation of the detection object. The pair of conductive wires is connected to the magnetism detecting element and transmits the output signal. The electronic device detects a rotational angle of the detection object based on the output signal. The pair of conductive wires includes a corresponding pair of wiring parts, which run in a virtual plane that is generally perpendicular to a direction of a sensitivity of the magnetism detecting element and extend along a rotational axis of the detection object in an area where the magnetic field is varied by the rotation of the detection object. BRIEF DESCRIPTION OF THE DRAWINGS [0007]The invention, together with additional objectives, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings. In the drawings: [0008]FIG. 1A is a cross-sectional view of a rotational angle detector in FIG. 1B taken along a line IA-IA according to a first embodiment of the present invention; [0009]FIG. 1B is a cross-sectional view of the rotational angle detector in FIG: 1A taken along a line IB-IB according to the first embodiment; [0010]FIG. 2A is a schematic view showing a magnetic field that permanent magnets generate; [0011]FIG. 2B is a schematic view showing the magnetic field that the permanent magnets generate; [0012]FIG. 2C is a schematic view showing the magnetic field that the permanent magnets generate; [0013]FIG. 3A is a diagram illustrating a method of detecting a rotational angle by the rotational angle detector; [0014]FIG. 3B is a diagram illustrating the method of detecting the rotational angle by the rotational angle detector; [0015]FIG. 3C is a diagram illustrating the method of detecting the rotational angle by the rotational angle detector; [0016]FIG. 4 is a table illustrating the method of detecting the rotational angle by the rotational angle detector; [0017]FIG. 5 is a diagram illustrating measures against noise according to the first embodiment; [0018]FIG. 6 is a diagram illustrating the measures against the noise according to the first embodiment; [0019]FIG. 7A is a cross-sectional view of a rotational angle detector in FIG. 7B taken along a line VIIA-VIIA according to a second embodiment of the present invention; Continue reading... Full patent description for Rotational angle detector Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Rotational angle detector patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Rotational angle detector or other areas of interest. ### Previous Patent Application: Continuously detecting the position of a moving element in a transmission ratio changer system Next Patent Application: Magnetic head testing apparatus and method of testing a magnetic head Industry Class: Electricity: measuring and testing ### FreshPatents.com Support Thank you for viewing the Rotational angle detector patent info. 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