Ink jet image recorder

A liquid droplet ejecting recording head for ejecting from an orifice a recording liquid filled in a chamber communicated with the orifice in the form of a droplet, to thereby attach the droplet to an image recording medium and record an image thereon, said liquid droplet ejecting recording head comprising:

• a wall defining a chamber for being filled with recording liquid, said wall having a portion for defining said orifice communicated with the chamber;
• a thin-film resistor provided on a surface of said wall facing the chamber so as to be located in the chamber, said thin-film resistor having one surface facing the chamber with which said thin-film resistor is exposed to the recording liquid contained in the chamber;
• means for energizing said thin-film resistor with pulsed electric current for generating pulsed heat to directly heat the recording liquid, to thereby allow the recording liquid to be ejected outside through the orifice from the chamber in the form of a droplet and to be attached onto a surface of an image recording medium positioned in confrontation with the orifice,
• wherein said thin-film resistor is made of a thin film of Ta--Si--SiO alloy, said thin film of Ta--Si--SiO alloy producing anti-cavitation and anti-galvanization properties of the thin-film resistor;
• said liquid droplet ejecting recording head further comprising a thin-film conductor electrically connected to the thin-film resistor for applying the pulsed electric current thereto,
• said thin-film conductor being provided on said thin-film resistor so as to have a surface with which said thin-film resistor is exposed to the recording liquid contained in the chamber, said thin-film conductor comprising nickel.

A liquid droplet ejecting recording head for ejecting from an orifice a recording liquid filled in a chamber communicated with the orifice in the form of a droplet, to thereby attach the droplet to an image recording medium and record an image thereon, said liquid droplet ejecting recording head comprising:

• a wall defining a chamber for being filled with recording liquid, said wall having a portion for defining said orifice communicated with the chamber;
• a thin-film resistor provided on a surface of said wall facing the chamber so as to be located in the chamber, said thin-film resistor having one surface facing the chamber with which said thin-film resistor is exposed to the recording liquid contained in the chamber;
• means for energizing said thin-film resistor with pulsed electric current for generating pulsed heat to directly heat the recording liquid, to thereby allow the recording liquid to be ejected outside through the orifice from the chamber in the form of a droplet and to be attached onto a surface of an image recording medium positioned in confrontation with the orifice,
• wherein said thin-film resistor is made of a thin film of Cr--Si--SiO alloy, said thin film of Cr--Si--SiO alloy producing anti-cavitation and anti-galvanization properties of the thin-film resistor;
• said liquid droplet ejecting recording head further comprising a thin-film conductor electrically connected to the thin-film resistor for applying the pulsed electric current thereto,
• said thin-film conductor being provided on said thin-film resistor so as to have a surface with which said thin-film resistor is exposed to the recording liquid contained in the chamber, said thin-film conductor comprising nickel,
• said thin-film resistor being located in the chamber at a position adjacent to the orifice for ejecting the recording liquid through the orifice,
• said liquid droplet ejecting recording head further comprising an additional thin-film resistor provided on the surface of said wall facing the chamber so as to be located in the chamber,
• said additional thin-film resistor having a surface facing the chamber with which said additional resistor is exposed to the recording liquid contained in the chamber,
• said thin-film resistor and said additional thin-film resistor being arranged so that said thin-film resistor is positioned between the orifice and said additional thin-film resistor,
• said additional thin-film resistor being energized by said means for energizing with pulsed electric current, for generating pulsed heat to directly heat the recording liquid, to thereby allow the recording liquid to flow toward the orifice so as to promote the orifice to be refilled with the recording liquid after said recording liquid is ejected from the orifice.

A liquid droplet ejecting recording head for ejecting from an orifice a recording liquid filled in a chamber communicated with the orifice in the form of a droplet, to thereby attach the droplet to an image recording medium and record an image thereon, said liquid droplet ejecting recording head comprising:

• a wall defining a chamber for being filled with recording liquid, said wall having a portion for defining said orifice communicated with the chamber;
• a thin-film resistor provided on a surface of said wall facing the chamber so as to be located in the chamber, said thin-film resistor having one surface facing the chamber with which said thin-film resistor is exposed to the recording liquid contained in the chamber;
• means for energizing said thin-film resistor with pulsed electric current for generating pulsed heat to directly heat the recording liquid, to thereby allow the recording liquid to be ejected outside through the orifice from the chamber in the form of a droplet and to be attached onto a surface of an image recording medium positioned in confrontation with the orifice,
• wherein said thin-film resistor is made of a thin film of Ta--Si--SiO alloy, said thin film of Ta--Si--SiO alloy producing anti-cavitation and anti-galvanization properties of the thin-film resistor;
• said liquid droplet ejecting recording head further comprising a thin-film conductor electrically connected to the thin-film resistor for applying the pulsed electric current thereto,
• said thin-film conductor being provided on said thin-film resistor so as to have a surface with which said thin-film resistor is exposed to the recording liquid contained in the chamber, said thin-film conductor comprising nickel,
• said thin-film resistor being located in the chamber at a position adjacent to the orifice for ejecting the recording liquid through the orifice,
• said liquid droplet ejecting recording head further comprising an additional thin-film resistor provided on the surface of said wall facing the chamber so as to be located in the chamber,
• said additional thin-film resistor having a surface facing the chamber with which said additional resistor is exposed to the recording liquid contained in the chamber,
• said thin-film resistor and said additional thin-film resistor being arranged so that said thin-film resistor is positioned between the orifice and said additional thin-film resistor,
• said additional thin-film resistor being energized by said means for energizing with pulsed electric current, for generating pulsed heat to directly heat the recording liquid, to thereby allow the recording liquid to flow toward the orifice so as to promote the orifice to be refilled with the recording liquid after said recording liquid is ejected from the orifice.