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US4370668A Expired / Lapsed US ⏱️ 0.0 years remaining

Liquid ejecting recording process

Assignee: Canon Inc
•
Filing: 1980-11-18
•
Granted: 1983-01-25
•
Expires: 2000-11-18
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Abstract

Abstract A liquid ejecting recording process using a liquid ejecting recording head comprises a liquid discharging portion including an orifice for ejecting liquid droplets and a heat acting portion communicated with said orifice, said heat acting portion being a portion where heat energy for discharging liquid droplets acts to a liquid, and an electrothermal transducer having a structure laminated on a substrate with the layers mentioned below in the following order a lower layer, a resistive heater layer, and an upper layer from the substrate to the heat acting portion on the position of the heat acting portion, characterized in that when a signal voltage is applied to said resistive heater layer and potentials generating at two electrodes A and B connected with said resistive heater layer are represented by V A and V B , respectively, potential V applied to at least the surface portion of said upper layer is kept intermediate between V A and V B at least while said signal voltage is applied to said resistive heater layer.

Inventors

  • 👤 Toshitami Hara
  • 👤 Shigeyuki Matsumoto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 21:04
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/045; B41J2/04501; B41J2/0458; B41J2/04588; B41J2/0459; B41J2/04591

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 165 words
A liquid ejecting recording process using a liquid ejecting recording head comprising: a liquid discharging portion including an orifice for ejecting liquid droplets, a heat acting portion in communication with the orifice, said heat acting portion being a portion where heat energy for discharging liquid droplets acts on a liquid, and an electrothermal transducer having a laminated structure provided on a substrate, with the structure comprising a lower layer positioned on the substrate, a resistive heater layer having electrodes A and B electrically connected thereto, and an upper layer positioned uppermost from the substrate and having a heating surface a portion of which is positioned in the heat acting portion, so that when a potential V is applied to the heating surface and potentials V A and V B are generated at the electrodes A and B, respectively, of said resistive heater layer, the potential V applied to the heating surface is kept at a potential intermediate the potentials V A and V B .
Claim 2
Dependent Claim 165 words
A liquid ejecting recording process using a liquid ejecting recording head comprising: a liquid discharging portion including an orifice for ejecting liquid droplets, a heat acting portion in communication with the orifice, said heat acting portion being a portion where heat energy for discharging liquid droplets acts on a liquid, and an electrothermal transducer having a laminated structure provided on a substrate, with the structure comprising a lower layer positioned on the substrate, a resistive heater layer having electrodes A and B electrically connected thereto, and an upper layer positioned uppermost from the substrate and having a heating surface a portion of which is positioned in the heat acting portion, so that when a potential V is applied to the heating surface and potentials V A and V B are generated at the electrodes A and B, respectively, of said resistive heater layer, the potential V applied to the heating surface is kept at a potential intermediate the potentials V A and V B .
Claim 3
Dependent Claim 20 words
A liquid ejecting recording process according to claim 1 in which potential V satisfies the following equation V=V.sub.A (1-x)+V.sub.B x(0.2≦x≦0.8).
Claim 4
Dependent Claim 20 words
A liquid ejecting recording process according to claim 1 in which potential V satisfies the following equation V=V.sub.A (1-x)+V.sub.B x(0.4≦x≦0.6).
Claim 5
Dependent Claim 20 words
A liquid ejecting recording process according to claim 1 in which potential V satisfies the following equation V≃V.sub.A +V.sub.B /2.
Claim 6
Dependent Claim 45 words
A liquid ejecting recording process according to claim 1 in which time period t 1 for single application of a signal voltage is the same as or shorter than time period t 2 for single application of a voltage V applied to a surface portion.

References Cited (Backward Citations)

US4251824A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-01-24 1986-07-26 1987-01-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-01-24 1990-07-26 1991-01-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-01-24 1994-07-26 1995-01-25 $7700.00 Window Closed / Lapsed

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