Bubble jet recording apparatus actuated by interface means

Claim 2

A bubble jet recording apparatus for projecting droplets of liquid, comprising: an orifice for projecting droplets of liquid; an inlet for accepting liquid for delivery to said orifice; a liquid flow path from said inlet to said orifice; heating means for heating liquid in said liquid flow path in response to recording signals to generate bubbles in said liquid flow path and project droplets of liquid from said orifice by raising the temperature of said heating means at each actuation thereof to a temperature above the maximum temperature at which the liquid in said liquid flow path is subjected only to nucleate boiling, wherein the liquid in said liquid flow path is heated so as to promote substantially instantaneous transfer of heat to the liquid in said liquid flow path substantially proximate to said heating means and to retard the transfer of heat from said heating means to liquid at other locations in said liquid flow path; and interface means connected with said heating means for receiving the recording signals and for actuating said heating means in accordance with the signals.

Claim 3

A bubble jet recording apparatus for projecting droplets of liquid, comprising: an orifice for projecting droplets of liquid; an inlet for accepting liquid for delivery to said orifice; a liquid flow path from said inlet to said orifice; heating means for heating liquid in said liquid flow path in response to recording signals to generate bubbles in said liquid flow path and project droplets of liquid from said orifice; 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 path, said heat accumulation layer having a thickness and heat conductivity such that when said heating means is actuated, said heat accumulation layer cooperates with said heating means to retard the transfer of the heat generated by said heating means away from said 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 liquid flow path is subjected only to nucleate boiling, and when said heating means is deactuated, said heat accumulation layer conducts heat away from said liquid flow path; and interface means connected with said heating means for receiving the recording signals and for actuating said heating means in accordance with the signals.

Claim 4

A bubble jet recording apparatus for projecting droplets of liquid, comprising: an orifice for projecting droplets of liquid; an inlet for accepting liquid for delivery to said orifice; a liquid flow path from said inlet to said orifice; heating means for heating liquid in said liquid flow path in response to recording signals to generate bubbles in said liquid flow path and project droplets of liquid from said orifice; 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 path, said heat accumulation layer having a thickness and heat conductivity such that when said heating means is actuated, said heat accumulation layer cooperates with said heating means to retard the transfer of the heat generated by said heating means away from said 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 liquid flow path is subjected only to nucleate boiling, and when said heating means is deactuated, said heat accumulation layer conducts heat away from said liquid flow path; and interface means connected with said heating means for receiving the recording signals and for actuating said heating means in accordance with the signals.