MEASURING DEVICE AND ABSOLUTE ANGLE IDENTIFICATION METHOD
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United States of America Patent
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Issued Date -
Oct 10, 2024
app pub date -
Apr 2, 2024
filing date -
Apr 6, 2023
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Abstract
A measuring device includes a first scale provided on a rotary scale, arranged around an rotation axis of the rotary scale, and having first patterns arranged along a circumferential direction, a second scale provided on the rotary scale, arranged around the rotation axis, and having a plurality of second patterns arranged along the circumferential direction, first pattern detection sections arranged around the rotation axis, a second detection section that faces the second scale and reads at least a part of the plurality of second patterns, and a calculator configured to identify an absolute angle of the rotary scale, on a basis of a reading result of the first pattern detection sections and a reading result of the second pattern detection section. A number of the second pattern detection section is less than a number of the plurality of first pattern detection sections.
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