Meter unit having magnetic pointer position detector
First Claim
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1. A meter unit comprising:
- a scale;
a pointer that rotates over the scale;
a pointer control means;
a rotation member controlled by the pointer control means integrally with the pointer; and
a pointer position detector for detecting that the pointer is positioned in a predetermined position over the scale, wherein the pointer position detector includes;
a magnetic material installed in a part of the rotation member; and
an output coil for generating magnetic flux toward the rotation member and a detection coil for detecting the magnetic flux thereby to magnetically detect that the pointer is positioned at the predetermined position over the scale.
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Abstract
A speed meter unit has a magnetic pointer position detector, including an output coil, a detection coil and a magnetic piece. The output coil generates magnetic flux. The detection coil is for detecting the magnetic flux from the output coil. When a pointer has returned to an initial position, the magnetic flux generated in the output coil can reach the detection coil through the magnetic piece, so that a microcomputer can detect the initial position of the pointer. Such the magnetic pointer position detector is resistive to the soil or the oxidization, so that the speed meter unit can detect the initial position of the pointer accurately and securely.
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Citations
13 Claims
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1. A meter unit comprising:
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a scale;
a pointer that rotates over the scale;
a pointer control means;
a rotation member controlled by the pointer control means integrally with the pointer; and
a pointer position detector for detecting that the pointer is positioned in a predetermined position over the scale, wherein the pointer position detector includes;
a magnetic material installed in a part of the rotation member; and
an output coil for generating magnetic flux toward the rotation member and a detection coil for detecting the magnetic flux thereby to magnetically detect that the pointer is positioned at the predetermined position over the scale. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification