Patent ID: 7686442

Claim:
A liquid container mountable on a liquid ejection apparatus, comprising: a container body having a liquid containing portion containing liquid therein; a liquid supply portion connectable to a liquid ejection portion of the liquid ejection apparatus; a liquid leading path leading the liquid in the liquid containing portion to the liquid supply portion; an atmosphere communication port communicating with atmosphere; a liquid end sensor disposed at a detecting position within the container body and in the liquid leading path, and operable to detect whether the liquid is present at the detecting position; and an air bubble trap passage disposed in the liquid leading path within the container body between the detecting position and the liquid containing portion, and having a plurality of bent portions so that a passage in which the liquid flows is changed in various directions for trapping air bubbles in the liquid; wherein the air bubble trap passage is formed into a coiled shape around an axis extending parallel with a gravity direction defined when the liquid container is mounted on the liquid ejection apparatus; and wherein an inlet port of the air bubble trap passage is formed to have a circular section so as to form a meniscus therein.