| 摘要 |
A tilt detecting device to be installed in a system where installation position is changed, characterized in that the tilt detecting device comprising at least one bubble tube, a light emitting element having an optical axis perpendicularly crossing an axis of the bubble tube and for emitting a light beam to pass through the bubble tube, and a photodetection element for receiving the light beam passing through the bubble tube, wherein tilting is detected based on photodetecting condition of the photodetection element, and the position of the system is changed in a direction rotating around the axis of the bubble tube. <IMAGE> <IMAGE> |
