Position detection system, position detection method, image generation unit and image projection apparatus
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United States of America Patent
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Aug 27, 2019
Grant Date -
Jan 25, 2018
app pub date -
Jul 12, 2017
filing date -
Jul 22, 2016
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Abstract
A position detection system includes a magnetic field generation unit to generate a magnetic field, a magnetic field detection unit to detect a magnetic flux density of the magnetic field effecting from the magnetic field generation unit, and to output a detection voltage corresponding to the detected magnetic flux density, and circuitry to amplify the detection voltage, set a reference voltage for amplifying the detection voltage, and an amplification level of the detection voltage based on at least one of a voltage input to the magnetic field detection unit and a gain value set for the amplification of the detection voltage or both of the voltage input to the magnetic field detection unit and the gain value set for the amplification of the detection voltage, and change the reference voltage to switch a region used for detecting a position of a movable member.
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