Substrate for a thermal ink jet printhead, a colour printhead in particular, and ink jet printhead incorporation this substrate

An inkjet printhead comprising a substrate, the substrate comprising:

• at least three actuating banks and at least three slots of elongated shape corresponding to said three actuating banks, said at least three slots being oriented lengthwise parallel to a given vertical direction, each of said at least three slots being made through the thickness of said substrate for conveying a flow of ink to the corresponding actuating bank, each of said three actuating banks consisting in turn of a plurality of ejection actuators arranged substantially in a line along the long opposite sides of the corresponding slot,
• a plurality of terminals arranged on the surface of said substrate for receiving a plurality of external signals suitable for selectively addressing and driving said actuators, and
• a plurality of drive circuits arranged between said terminals and said actuating banks for selectively controlling, in response to the external signals received by said terminals, the ejection actuators of said three actuating banks, said drive circuits extending, around said actuating banks, along portions of the surface of said substrate, of elongated shape and substantially parallel to said at least three slots and therefore to said given vertical direction, said drive circuits being interconnected according to a grid configuration defining said terminals and such as to allow said ejection actuators to be addressed with a lesser number of terminals than that of said ejection actuators,
• a first long slot, and three short slots parallel to one another according to said given vertical direction, wherein said three short slots are arranged substantially in a line with one another lengthwise, i.e. parallel to said given vertical direction, alongside said first long slot,
• wherein at least two of said at least three slots are arranged on the surface of said substrate one beside the other along the respective long sides, and therefore parallel to said given vertical direction.
• wherein said terminals associated with the drive circuits for selectively addressing and driving the ejection actuators are arranged in a zone external to said at least three slots and to said drive circuits, substantially in a line with one another parallel to said given vertical direction.

An inkjet printhead comprising a substrate, the substrate comprising:

• at least three actuating banks and at least three slots of elongated shape corresponding to said three actuating banks, said at least three slots being oriented lengthwise parallel to a given vertical direction, each of said at least three slots being made through the thickness of said substrate for conveying a flow of ink to the corresponding actuating bank, each of said three actuating banks consisting in turn of a plurality of ejection actuators arranged substantially in a line along the long opposite sides of the corresponding slot,
• a plurality of terminals arranged on the surface of said substrate for receiving a plurality of external signals suitable for selectively addressing and driving said actuators, and
• a plurality of drive circuits arranged between said terminals and said actuating banks for selectively controlling, in response to the external signals received by said terminals, the ejection actuators of said three actuating banks, said drive circuits extending, around said actuating banks, along portions of the surface of said substrate, of elongated shape and substantially parallel to said at least three slots and therefore to said given vertical direction, said drive circuits being interconnected according to a grid configuration defining said terminals and such as to allow said ejection actuators to be addressed with a lesser number of terminals than that of said ejection actuator,
• wherein at least two of said at least three slots are arranged on the surface of said substrate one beside the other along the respective long sides, and therefore parallel to said given vertical direction,
• wherein said terminals associated with the drive circuits for selectively addressing and driving the ejection actuators are arranged in a zone external to said at least three slots and to said drive circuits, substantially in a line with one another parallel to said given vertical direction, and
• wherein said terminals are connected with said drive circuits through a plurality of adjacent tracks forming a bunch for the transmission to the drive circuits of the signals received by the terminals, wherein said bunch extends on the surface of said substrate between said at least three slots, and in particular comprises at least a rectilinear portion which extends between the two slots which are arranged one beside the other on said upper portion of the substrate, and also parallel thereto.

An inkjet printhead comprising a substrate, the substrate comprising:

• at least three actuating banks and at least three slots of elongated shape corresponding to said three actuating banks, said at least three slots being oriented lengthwise parallel to a given vertical direction, each of said at least three slots being made through the thickness of said substrate for conveying a flow of ink to the corresponding actuating bank, each of said three actuating banks consisting in turn of a plurality of ejection actuators arranged substantially in a line along the long opposite sides of the corresponding slot,
• a plurality of terminals arranged on the surface of said substrate for receiving a plurality of external signals suitable for selectively addressing and driving said actuators, and
• a plurality of drive circuits arranged between said terminals and said actuating banks for selectively controlling, in response to the external signals received by said terminals, the ejection actuators of said three actuating banks, said drive circuits extending, around said actuating banks, along portions of the surface of said substrate, of elongated shape and substantially parallel to said at least three slots and therefore to said given vertical direction, said drive circuits being interconnected according to a grid configuration defining said terminals and such as to allow said ejection actuators to be addressed with a lesser number of terminals than that of said ejection actuators,
• wherein at least two of said at least three slots are arranged on the surface of said substrate one beside the other along the respective long sides, and therefore parallel to said given vertical direction,
• wherein said terminals associated with the drive circuits for selectively addressing and driving the ejection actuators are arranged in a zone external to said at least three slots and to said drive circuits, substantially in a line with one another parallel to said given vertical direction,
• wherein said terminals are arranged one beside the other along two opposite sides of said substrate, parallel to said given vertical direction and wherein said terminals are divided into a first addressing group and into a second addressing group defined by the grid structure of said drive circuits, wherein the terminals belonging to said first addressing group are electrically connected to said drive circuits via one or more bunches of adjacent tracks, and the terminals belonging to said second addressing group are each electrically connected to a plurality of terminals common to a group of actuators.