Ink cartridge

An ink jet recording device supplied with ink from an ink cartridge including a container that stores ink therein and having an ink supply port in a leading end side in an insertion direction of the container;

• a memory device having at least one electrode for electrical connection to the recording device, the at least one electrode being disposed on a first of two opposite surfaces substantially parallel to the insertion direction of the container;
• and a retaining member disposed on the first surface, and located at a trailing end side relative to the at least one electrode in the insertion direction, for engaging with the recording device, the recording device comprising
• at least one contact disposed at a position corresponding to a region where the retaining member is provided, and for electrical connection to the electrode of the memory device;
• and
• an elastic member that applies an urging force in a direction substantially parallel to the insertion direction of the ink cartridge.

An ink cartridge comprising:

• a container that stores ink therein and has an ink supply port in a leading end side in an insertion direction of the container;
• a memory device having at least one electrode for electrical connection to a recording device, the at least one electode being disposed on a first of two opposite surfaces substantially parallel to the insertion direction of the container;
• a retaining member disposed on the first surface and located at a trailing end side relative to the at least one electrode in the insertion direction, for engagement with the recording device;
• and
• a guide recess located substantially at the center of the container and extending in the insertion direction.

An ink jet recording device supplied with ink from an ink cartridge including a container that stores ink therein and has an ink supply port in a leading end side in an insertion direction of the container;

• a memory device having at least one electrode for electrical connection to the recording device, the at least one electrode being disposed on a first of two opposite surfaces substantially parallel to the insertion direction of the container;
• a retaining member disposed on the first surface and located at a trailing end side relative to the at least one electrode in the insertion direction, for engaging with the recording device;
• and a guide recess located substantially at the center of the container and extending in the insertion direction, said recording device comprising:
• a guide protrusion for engaging the guide recess;
• and
• an elastic member that resists insertion of the ink cartridge and which said elastic member is disposed at a side opposite to the retaining member with respect to the guide protrusion.

An ink cartridge comprising:

• a container body having a first wall;
• at least one electrode connected to main circuit components of a memory device, the at least one electrode being fixed relative to the first wall;
• and
• an engagement portion movable relative to the first wall and being higher in a Y-axis direction than the at least one electrode.