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US 4,740,796 AGranted
Bubble jet recording method and apparatus in which a heating element generates bubbles in multiple liquid flow paths to project droplets
AssigneeCanon Kabushiki Kaisha
InventorsIchiro Endo, Yasushi Sato, Seiji Saito, Takashi Nakagiri, Shigeru Ohno
Life of this patent
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Abstract
Liquid droplets are formed by instantaneous state change by thermal energy of a liquid filled in a thermal chamber, said droplets being deposited onto a recording member to achieve recording.
Claims10
A bubble jet recording process for projecting droplets of liquid, the process comprising the steps of:
- providing a bubble jet recording head having a plurality of orifices from which droplets of liquid are projected, a plurality of inlets to which liquid is supplied for delivery to respective orifices, a plurality of liquid flow paths from corresponding inlets to corresonding orifices and a plurality of heating means for heating liquid in an associated liquid flow path;
- repeatedly actuating individual heating means to generate bubbles in the associated liquid flow path and project droplets of liquid from the corresponding orifice;
- and
- raising the temperature of the heating means at each actuation thereof to a temperature above the maximum temperature at which the liquid in the liquid flow path is subjected only to nucleate boiling, wherein the liquid in the liquid flow path is heated so as to promote substantially instantaneous transfer of heat to the liquid in the associated liquid flow path substantially proximate to the heating means and to retard the transfer of heat from the heating means to liquid at other locations in the associated liquid flow path.
1 more element
A bubble jet recording head for projecting droplets of liquid, the head comprising:
- a plurality of orifices for projecting droplets of liquid;
- a plurality of inlets for accepting liquid for delivery to respective said orifices;
- a plurality of liquid flow paths from corresponding said inlets to corresponding said orifices;
- a plurality of repeatedly actuatable heating means, each being arranged for heating liquid in an associated said liquid flow path to generate bubbles in said associated liquid flow path and project droplets of liquid from said corresponding orifice;
- and
- a substrate including a heat accumulation layer having said heating means thereon and disposed with said heating means between said heat accumulation layer and said liquid flow paths, said heat accumulation layer having a thickness and heat conductivity such that when each said heating means is actuated, said heat accumulation layer cooperates with said heating means to retard transfer of the heat generated by said heating means away from said associated liquid flow path and to promote substantially instantaneous raising of the temperature of said heating means at each actuation thereof to a temperature above the maximum temperature at which the liquid in said associated liquid flow path is subjected only to nucleate boiling, and when each said heating means is de-actuated, said heat accumulation layer conducts heat away from said associated liquid flow path.
3 more elements
Dependencies are inferred from the claim text.