Liquid container for a liquid ejection device with a vibration sensor for ink level detection

A liquid container for a liquid ejection device, comprising:

• a storage, adapted to store liquid therein;
• a liquid supply port, adapted to supply liquid stored in the storage to the liquid ejection device;
• a vibrator, operable to activate vibrations on the liquid to be supplied to the liquid supply port from the storage;
• a rigid member, opposing the vibrator such that the liquid to be supplied to the liquid supply port passes there between;
• and
• a detector, operable to detect a vibration characteristic of the vibrator, there by detecting an amount of liquid in the storage, wherein:
• a distance between the vibrator and the rigid member is variable in accordance with the amount of liquid in the storage;
• and
• the vibration characteristic of the vibrator changes in accordance with the distance between the vibrator and the rigid member.