Electronic Level
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United States of America Patent
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Issued Date -
Oct 17, 2013
app pub date -
Apr 2, 2013
filing date -
Apr 16, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An electronic level for receiving a reflection light from a pattern marked on a leveling rod and for determining a height of sighting position and a distance to the leveling rod is disclosed. The electronic level comprises an electronic level main unit, a sighting optical system accommodated in the electronic level main unit and for sighting the leveling rod, a line sensor for receiving a part of reflection light, and a control arithmetic unit for calculating a height of sighting position and a distance to the leveling rod based on signals from the line sensor. The electronic level has a crude measurement mode and a precise measurement mode, wherein the crude measurement mode is initiated by the control arithmetic unit, and the measurement mode is changed over to the precise measurement mode by detecting the pattern based on a photodetection signal from said line sensor by measurement.
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