Patent ID: 8328306

Claim:
A liquid container, operable to supply a liquid to a liquid ejecting apparatus, the liquid container comprising: a liquid containing portion capable of containing the liquid; a liquid supply portion one end of which is connected to the liquid containing portion and the other end of which includes an opening which opens outwardly, the liquid supply portion allowing the liquid to flow from the liquid containing portion to the liquid ejecting apparatus and including a liquid detecting portion which is operable to detect an amount of the liquid in the liquid container which liquid detecting portion includes a liquid detection chamber that contains the liquid supplied from the liquid containing portion and a sensor that is disposed in the liquid detection chamber and that outputs a detection signal which is used to detect the amount of the liquid in the liquid container; and a check valve that prevents a liquid from flowing to the liquid detection chamber from the opening, the check valve disposed in a downstream flowpath located downstream of the liquid detection chamber in the liquid supply portion in a flow direction in which the liquid is supplied to the liquid ejecting apparatus; wherein the sensor includes: a communication flowpath that communicates with the liquid detection chamber; a diaphragm that is a part of the communication flowpath; and a piezoelectric element that outputs a waveform signal corresponding to a residual vibration waveform resulting from vibrations applied to the diaphragm, the check valve includes a valve body and a valve seat, the liquid detection chamber includes an opening portion in a surface facing the sensor; and the liquid detecting portion includes a flexible element with which the opening portion is closed and which is deformed in accordance with pressure of an inside of the liquid detection chamber; and a movable member, at least one part of the movable member being displaced in accordance with deformation of the flexible element, the movable member capable of bringing the liquid detection chamber and the communication flowpath of the sensor into a non-communication state by displacement of the movable member, the movable member including a through-hole-forming part which functions as the valve seat and in which a through-hole, through which the liquid detection chamber and the downstream flowpath communicate with each other, is formed.