Patent ID: 8398218

Claim:
An image forming apparatus, comprising: a liquid jet head configured to eject a liquid droplet onto a recording medium; a container main body configured to receive liquid to be supplied to the liquid jet head from an liquid cartridge; and an air opening mechanism configured to open and close an air opening path in the container main body, the air opening path being configured to open an inside of the container main body to the atmosphere, wherein the air opening mechanism includes a holding part including a valve body part configured to open and close the air opening path, and an opening member movably provided at the holding part, the opening member being configured to open the valve body part by being pushed from an outside of the container main body; wherein the opening member includes an air communicating path configured to be in communication with the atmosphere and forming a part of the air opening path; a filter member provided at an air side opening part of the air communicating path of the opening member, the filter member having an external surface coming in contact with the atmosphere; and an air room provided at an internal surface side of the filter member; and wherein an opening cross-sectional area of the air room in a direction perpendicular to an air flow-in direction is greater than an opening cross-sectional area of the air communicating path in a direction perpendicular to an air flow-in direction.