Patent ID: 7370527
Filing Date: 2008-05-13
Classification: G01F,G01N

Abstract:
1. A liquid level detecting apparatus for detecting a liquid level of a liquid in a liquid storage tank, comprising: an ultrasonic oscillation device that generates an ultrasonic wave and receives a reflection wave of the ultrasonic wave reflected on the liquid level; a reflector member that reflects the ultrasonic wave generated by the ultrasonic oscillation device to the liquid level and reflects the reflection wave to the ultrasonic oscillation device; a first path member that has a tubular shape and surrounds a first transmission path of the ultrasonic wave between the ultrasonic oscillation device and the reflector member; a second path member that has a tubular shape and surrounds a second transmission path of the ultrasonic wave between the reflector member and the liquid level; a holder that holds the reflector member, the first path member and the second path member at predetermined positions relative to one another; and a base member that is to be fixed on a bottom of the liquid storage tank and supports the holder rotatably about a rotational axis in parallel with the first path member to fold the holder from an upright position to place the second path member on the second transmission path to a folded position to position closer to the bottom of the liquid storage tank than the upright position.