Patent ID: 7172259

Claim:
An ink tank which is mounted on a recording apparatus for performing recording based on input image information by ejecting ink to a recording medium from a recording means, and which stores ink to be supplied to the recording means, said ink tank comprising: a plurality of walls forming a storing portion for storing ink; an engagement member provided on one of said plurality of walls to be in engagement with the recording means; and a detecting portion provided on one of said plurality of walls other than said wall which is provided with said engagement member, said detecting portion having two surfaces respectively formed at predetermined angles with respect to an inner wall of said ink tank, and said detecting portion being formed with a light transmittable member and configured to vary an amount of light reflected from outside said ink tank according to an amount of ink in said ink tank, wherein an edge formed by said two surfaces of said detecting portion is parallel to a longitudinal direction of said wall which is provided with said detecting portion, and said wall which is provided with said engagement member is adjacent to a shorter edge of said wall which is provided with said detecting portion, and said engagement member is adapted to be in engagement with the recording means by a movement of said ink tank along the longitudinal direction.