Multilayer ink jet recording head having a pressure generating unit and a flow path unit

A multi-layer ink jet type recording head comprising:

• a pressure generating unit comprising a plurality of pressure chambers and actuator means for increasing pressure in said pressure chambers;
• a flow path unit, connected to said pressure generating unit, comprising:
• a nozzle plate member having nozzle openings formed therein;
• an ink supplying member, said ink supplying member having an ink supplying inlet member and having first through-holes formed therein through which said pressure chambers are communicated with said nozzle openings and a reservoir is communicated with said pressure chambers, said ink supplying inlet member being directly connected to said ink supplying member, and said ink supplying inlet member extending in a direction perpendicular to said ink supplying member;
• and
• a spacer member, said spacer member having said reservoir and second through-holes through which said pressure chambers are communicated with said nozzle openings;
• wherein said pressure chambers are communicated with said nozzle openings via said first through-holes in said ink supplying member and said second through-holes in said spacer member;
• said ink supplying member, said spacer member and said nozzle plate member being integrally connected to one another in such a manner that said ink supplying member is placed on one surface of said spacer member and said nozzle plate member is fixedly placed on the other surface of said spacer member.

An ink jet recording head comprising:

• thin plate members;
• an ink supply inlet member;
• an ink supply section, formed in a first one of said thin plate members, including a single, continuous, V-shaped ink reservoir, wherein said ink supply inlet member is communicated with said single, continuous, V-shaped ink reservoir and extends in a direction perpendicular to a plane defined by said single, continuous, V-shaped ink reservoir, such that an ink flows unimpeded from said ink supply inlet member to said single, continuous, V-shaped ink reservoir;
• nozzle openings, formed in a second one of said thin plate members;
• and
• pressure producing chambers, formed in a third one of said thin plate members, respectively corresponding to said nozzle openings;
• each of said thin plate members having a plurality of holes therein, said holes in said ink supply section being arranged at an inner portion of said single, continuous, V-shaped ink reservoir, said thin plate members being laminated together so that said holes formed in adjacent ones of said thin plate members are aligned with each other to form a plurality of ink flow paths continuously extending from each of said nozzle openings to said respective pressure producing chambers, wherein said pressure producing chambers communicate with said single, continuous, V-shaped ink reservoir;
• wherein an area of any given hole of said plurality of holes forming said ink flow paths is not larger than the area of any others of said holes formed in any of said thin plate members disposed relatively closer to said pressure producing chambers than said thin plate member having said any given hole.

An ink jet recording head comprising:

• thin plate members;
• an ink supply inlet member;
• an ink supply section, formed in a first one of said thin plate members, including a single, continuous, V-shaped ink reservoir, wherein said ink supply inlet member is communicated with said single, continuous, V-shaped ink reservoir and extends in a direction perpendicular to a plane defined by said single, continuous, V-shaped ink reservoir, such that an ink flows unimpeded from said ink supply inlet member to said single, continuous, V-shaped ink reservoir;
• nozzle openings, formed in a second one of said thin plate members;
• and
• pressure producing chambers, formed in a third one of said thin plate members, respectively corresponding to said nozzle openings, each of said thin plate members comprising a plurality of holes therein, said holes in said ink supply section being arranged at an inner portion of said single, continuous, V-shaped ink reservoir,
• said thin plate members being laminated together so that said holes formed in said thin plate members are arranged along open line to form a plurality of ink flow paths continuously extending from each of said nozzle openings to said respective pressure producing chambers which communicate with said single, continuous, V-shaped ink reservoir.