Ink cartridge for ink jet printer

An ink cartridge for an ink jet printer, detachably mounted to a cartridge mounting part of the ink jet printer, a convex part being provided in the cartridge mounting part of the ink jet printer, wherein the ink cartridge comprises:

• an ink storage chamber for storing ink;
• an ink supply port for supplying the ink from inside of the ink storage chamber to outside of the ink storage chamber via the ink supply port;
• a first detecting mechanism for shielding light emitted by a first sensor of the ink jet printer or changing a path of light emitted by the first sensor when the ink cartridge is loaded into the cartridge mounting part;
• a movable member that is pushed and moved by the convex part of the ink jet printer in the process of mounting the ink cartridge to the cartridge mounting part of the ink jet printer;
• and
• a second detecting mechanism that is linked with the movable member and can selectively shield light emitted by a second sensor of the ink jet printer or changing a path of light emitted by the second sensor;
• wherein, when the ink cartridge is mounted to the ink jet printer, the second detecting mechanism moves up and down reciprocatively in a height direction perpendicular to a direction in which the ink cartridge is mounted, and
• wherein, the movable member comprises a push rod and an elastic member, a through hole is provided at a position corresponding to the convex part when the ink cartridge is mounted, and the movable member is located in the through hole.