Shaft support structure, laser beam projecting unit and surveying instrument
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United States of America Patent
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Apr 28, 2020
Grant Date -
Feb 8, 2018
app pub date -
Jul 25, 2017
filing date -
Aug 3, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention provides a laser beam projecting unit in which a hollow rotation shaft is provided on a fixed portion via one bearing, a rotor of an axial gap-type motor is provided on one end portion of the rotation shaft, a stator of the axial gap-type motor is provided on the fixed portion so as to confront the rotor, an attracting force between the rotor and the stator acts on the bearing as a pressurization, an angle detector for detecting a rotation angle of the rotation shaft is provided on the other end portion of the rotation shaft, a deflection optical component is provided inside the rotation shaft, and a laser beam is projected through the deflection optical component.
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International Classification(s)
- H02K:DYNAMO-ELECTRIC MACHINES
- G02B:OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- G01S:RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMI....
- G01C:MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING....
- G01B:MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIME....
- G01D:MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VAR....
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