Detector of liquid consumption condition

A detector of liquid consumption condition comprising;

• a vibrating part that can vibrate relatively to a containing space that can be filled and refilled with a liquid, at least a portion of the vibrating part being exposed to the containing space,
• a piezoelectric device that can cause the vibrating part to vibrate based on a driving signal and that can generate a counter electromotive force signal by a vibration of the vibrating part,
• a second vibrating part that can vibrate relatively to the containing space, at least a portion of the second vibrating part being exposed to the containing space,
• a second piezoelectric device that can cause the second vibrating part to vibrate based on a driving signal and that can generate a counter electromotive force signal by a vibration of the second vibrating part, and
• a liquid consumption condition detecting part that can detect a liquid consumption condition based on the counter electromotive force signal from at least one of the piezoelectric devices,
• wherein:
• the vibrating part and the piezoelectric device are provided in a vicinity of and higher than a predetermined level in the containing space, and
• the second vibrating part and the second piezoelectric device are provided in a vicinity of and lower than the predetermined level in the containing space.

A liquid container comprising;

• a wall part defining a containing space that can contain a liquid in a refillable manner,
• a vibrating part that can vibrate relatively to the containing space, at least a portion of the vibrating part being exposed to the containing space,
• a piezoelectric device that can cause the vibrating part to vibrate based on a driving signal and that can generate a counter electromotive force signal by a vibration of the vibrating part,
• a second vibrating part that can vibrate relatively to the containing space, at least a portion of the second vibrating part being exposed to the containing space, and
• a second piezoelectric device that can cause the second vibrating part to vibrate based on a driving signal and that can generate a counter electromotive force signal by a vibration of the second vibrating part,
• wherein:
• the containing space can contain only a predetermined volume of the liquid,
• the vibrating part and the piezoelectric device are provided in a vicinity of a liquid surface in the containing space when the containing space contains the predetermined volume of the liquid, and
• the second vibrating part and the second piezoelectric device are provided in a vicinity of a liquid surface in the containing space when the liquid is exhausted from the containing space.

A liquid container comprising;

• a wall part defining a containing space that can contain a liquid in a refillable manner,
• a vibrating part that can vibrate relatively to the containing space, at least a portion of the vibrating part being exposed to the containing space,
• a piezoelectric device that can cause the vibrating part to vibrate based on a driving signal and that can generate a counter electromotive force signal by a vibration of the vibrating part,
• a second vibrating part that can vibrate relatively to the containing space, at least a portion of the second vibrating part being exposed to the containing space, and
• a second piezoelectric device that can cause the second vibrating part to vibrate based on a driving signal and that can generate a counter electromotive force signal by a vibration of the second vibrating part,
• wherein:
• the vibrating part and the piezoelectric device are provided in a vicinity of and higher than a predetermined level in the containing space, and
• the second vibrating part and the second piezoelectric device are provided in a vicinity of and lower than the predetermined level in the containing space.

A method of manufacturing a liquid container a liquid container including:

• a wall part defining a containing space that can contain a liquid in a refillable manner,
• a vibrating part that can vibrate relatively to the containing space, at least a portion of the vibrating part being exposed to the containing space,
• a piezoelectric device that can cause the vibrating part to vibrate based on a driving signal and that can generate a counter electromotive force signal by a vibration of the vibrating part, and
• a liquid consumption condition detecting part that can detect a liquid consumption condition based on the counter electromotive force signal from the piezoelectric device,
• wherein:
• the containing space can contain only a predetermined volume of the liquid,
• the vibrating part is provided in a vicinity of a liquid surface in the containing space when the containing space contains the predetermined volume of the liquid, and
• the portion of the vibrating part exposed to the containing space has a liquid-philic characteristic with respect to the liquid,
• comprising;
• a liquid-philic-part forming step of structuring the portion of the vibrating part exposed to the containing space as a part having a liquid-philic characteristic with respect to the liquid, and
• a mounting step of attaching the liquid consumption condition detecting part to the wall part, after the liquid-philic-part forming step.

A method of manufacturing a liquid container a liquid container including:

• a wall part defining a containing space that can contain a liquid in a refillable manner,
• a vibrating part that can vibrate relatively to the containing space, at least a portion of the vibrating part being exposed to the containing space,
• a piezoelectric device that can cause the vibrating part to vibrate based on a driving signal and that can generate a counter electromotive force signal by a vibration of the vibrating part, and
• a liquid consumption condition detecting part that can detect a liquid consumption condition based on the counter electromotive force signal from the piezoelectric device,
• wherein
• the containing space can contain only a predetermined volume of the liquid,
• the vibrating part is provided in a vicinity of a liquid surface in the containing space when the containing space contains the predetermined volume of the liquid, and
• the portion of the vibrating part exposed to the containing space has a liquid-philic characteristic with respect to the liquid,
• comprising;
• a mounting step of attaching the liquid consumption condition detecting part to the wall part, and
• a liquid-philic-part forming step of providing a liquid-philic characteristic with respect to the liquid for the portion of the vibrating part exposed to the containing space, after the mounting step.