Liquid supply apparatus and liquid ejection apparatus with contactless detection of liquid remaining amount

摘要

A liquid supply apparatus includes a supply passage for supplying a liquid stored in a liquid storage section to a liquid ejection head. The liquid supply apparatus further includes: a region set within a range including an inside of the liquid storage section and an inside of the supply passage, pressure applied to the liquid in the region varying according to an amount of the liquid remaining in the liquid storage section or in the supply passage; a gas chamber communicating with the region in such a manner that a pressure of gas in the gas chamber varies according to the pressure applied to the liquid in the region; and a pressure sensor detecting pressure in the gas chamber.

主权项

1. A liquid supply apparatus including a supply passage for supplying a liquid stored in a liquid storage section to a liquid ejection head, comprising:
a gas liquid separation chamber configured to separate a gas contained in the liquid, wherein pressure applied to the gas varies according to an amount of the liquid remaining in the liquid storage section or in the supply passage; a pressure detecting unit configured to detect the pressure of the gas in the gas liquid separation chamber; and a determination unit configured to determine the amount of the liquid in the liquid storage section based on a detection result by the pressure detecting unit.