Ink jet recording head formed by cutting process

An ink jet recording method for high speed recording, which comprises:

• applying a high frequency input signal to a heat generating means located in a chamber containing a liquid and having a discharge orifice with a maximum diameter d, the heat generating means being spaced a predetermined distance D within a range of d to 50d from the discharge orifice;
• and
• driving the heat generating means in response to the high frequency input signals to repetitively cause formation of a bubble in the liquid and discharge of liquid droplets from the discharge orifice;
• wherein the relationship of the predetermined distance D of the heat generating means to the maximum diameter d of the discharge orifice is such that formation and disappearance of the bubble in the liquid in the chamber produces sufficient pressure to cause droplets to be discharged from the orifice without the bubble communicating with the atmosphere outside of the chamber and the predetermined distance D and the frequency of the applied input signals are preselected so as to discharge droplets at a speed of 1.3 m/sec. or greater.

An ink jet recording apparatus for high speed recording, comprising:

• means for generating a high frequency driving signal;
• a recording head having a passageway for a liquid with an opening for discharging liquid from said passageway, said opening having a maximum diameter d;
• and
• bubble generating means, positioned in said passageway and having a pair of electrodes for supplying the high frequency signal to opposite sides of said bubble generating means with respect to said passageway, said bubble generating means sequentially generating a bubble in the liquid in response to the high frequency signal, with the generation and disappearance of the bubble causing the liquid to be discharged through said opening, said bubble generating means having an edge closest to said opening which is spaced from said opening by a predetermined distance D in the range of d to 50d, and wherein one of said electrodes is attached to said side of said bubble generating means proximate to said opening and outside the space between said bubble generating means and said opening, wherein the relationship of said maximum diameter d and said predetermined distance D produces a bubble of such a size as to generate in the liquid a pressure to cause droplets to be discharged from said opening without the bubble communicating with the atmosphere outside said passageway and said predetermined distance D and the frequency of the driving signal are preselected so as to discharge droplets at a speed of 1.3 m/sec. or greater.

An ink jet recording method for high speed recording, which comprises:

• applying a high frequency input signal to a heat generating means mounted on a substrate and located in a chamber containing a liquid and having a discharge orifice with a maximum diameter d, the heat generating means being spaced a predetermined distance D within a range of d to 50d from the discharge orifice, wherein the predetermined distance D is formed by cutting and removing a portion of the substrate between the heat generating means and an edge of the substrate corresponding to the discharge orifice;
• and
• driving the heat generating means in response to the high frequency input signals to repetitively cause formation of a bubble in the liquid and discharge of liquid droplets from the discharge orifice,
• wherein the relationship of the predetermined distance D of the heat generating means to the maximum diameter d of the discharge orifice is such that formation and disappearance of the bubble in the liquid in the chamber produces sufficient pressure to cause droplets to be discharged from the orifice without the bubble communicating with the atmosphere outside of the chamber and the predetermined distance D and the frequency of the applied input signals are preselected so as to discharge droplets at a speed of 1.3 m/sec. or greater.

An ink jet recording method for high speed recording, which comprises:

• applying a high frequency input signal to a heat generating means located in a chamber containing a liquid and having a discharge orifice with a maximum diameter d, the heat generating means being spaced a predetermined distance D within a range of d to 50d from the discharge orifice, the heat generating means having a pair of electrodes for supplying the high frequency signal to opposite sides of the heat generating means with respect to said chamber, wherein one of the electrodes is attached to the side of the heat generating means proximate to the orifice and outside the space between the heat generating means and the orifice;
• and
• driving the heat generating means in response to the high frequency input signals to repetitively cause formation of a bubble in the liquid and discharge of liquid droplets from the discharge orifice,
• wherein the relationship of the predetermined distance D of the heat generating means to the maximum diameter d of the discharge orifice is such that formation and disappearance of the bubble in the liquid in the chamber produces sufficient pressure to cause droplets to be discharged from the orifice without the bubble communicating with the atmosphere outside of the chamber and the predetermined distance D and the frequency of the applied input signals are preselected so as to discharge droplets at a speed of 1.3 m/sec. or greater.

An ink jet recording head for high speed recording, comprising:

• a body having a passageway for a liquid with an opening for discharging liquid from said passageway, said opening having a maximum diameter d;
• and
• bubble generating means, positioned in said passageway and having a pair of electrodes for supplying a driving signal to opposite sides of said bubble generating means with respect to said passageway, said bubble generating means sequentially generating a bubble in the liquid in response to the driving signal, with the generation and disappearance of the bubble causing the liquid to be discharged through said opening, said bubble generating means having an edge closest to said opening which is spaced from said opening by a predetermined distance D in the range of d to 50d, one of said electrodes being attached to said side of said bubble generating means proximate to said opening such that it is outside the space between said bubble generating means and said opening, wherein the relationship of said maximum diameter d and said predetermined distance D produces a bubble of such a size as to generate in the liquid a pressure to cause droplets to be discharged from said opening without the bubble communicating with the atmosphere outside said passageway and said predetermined distance D and the frequency of the driving signal are preselected so as to discharge droplets at a speed of 1.3 m/sec. or greater.

An ink jet recording head, comprising:

• a plurality of discharge openings formed in a discharge opening surface for discharging ink;
• a plurality of liquid passageways for holding ink, each said liquid passageway communicating independently with a respective discharge opening;
• and
• a plurality of heat generating members, each said heat generating member corresponding to a liquid passageway for providing thermal energy to the ink in said liquid passageway for abruptly forming a bubble for discharging ink from said discharge opening, each said heat generating member having a pair of electrodes for driving said heat generating member individually, each said pair of electrodes and corresponding heat generating member forming a U-shaped wiring portion, each said U-shaped wiring portion corresponding to a respective liquid passageway, wherein said recording head is manufactured using a cutting process for forming said discharge opening surface.

An ink jet recording head, comprising:

• a plurality of discharge openings formed in a discharge opening surface for discharging ink;
• a plurality of liquid passageways for holding the ink, each said liquid passageway communicating independently with a respective discharge opening;
• a plurality of heat generating members, each said heat generating member corresponding to a liquid passageway for abruptly forming a bubble in the ink in said liquid passageway for discharging ink from said discharge opening;
• and
• pairs of electrodes, each said pair of electrodes being connected to a corresponding heat generating member for driving said heat generating member, each said pair of electrodes and corresponding heat generating member forming a U-shaped wiring portion, each said U-shaped wiring portion corresponding to a respective liquid passageway, wherein said recording head is manufactured using a cutting process to form said discharge opening surface.

An ink jet recording head, comprising:

• a substrate;
• a plurality of discharge openings formed in a discharge opening surface for discharging ink;
• a plurality of liquid passageways for holding the ink, each said liquid passageway communicating independently with a respective discharge opening;
• and
• a plurality of heat generating members provided on said substrate, each said heat generating member corresponding to a liquid passageway for providing thermal energy to the ink in said liquid passageway for abruptly forming a bubble for discharging ink from said discharge opening, each said heat generating member having a pair of electrodes for driving said heat generating member individually, each said pair of electrodes and corresponding heat generating member forming a U-shaped wiring portion, each said U-shaped wiring portion corresponding to a respective liquid passageway, wherein said recording head is manufactured using a cutting process to form said discharge opening surface.