Patent ID: 6834940
Filing Date: 2004-12-28
Classification: B41J

Abstract:
A liquid discharge head for discharging a liquid droplet utilizing generated bubbles by heating the liquid to form the generated bubbles, comprising:a discharge port for discharging the liquid droplet; a bubbling chamber communicating with said discharge port for filling liquid; a heat-generating member arranged in said bubbling chamber, being supported in a state of having a gap between said heat-generating member and an inner wall face of said bubbling chamber, on both sides of said heat-generating member; and a supporting portion for supporting said heat-generating member, wherein, after a bubble is generated in the liquid by said heat-generating member, a surface temperature of said heat-generating member is made lower than a bubbling temperature, at a time of bubble extinction, by heat radiation from said heat-generating member to said supporting portion, wherein said heat-generating member is formed to be flat, using a thin resistive film, wherein said supporting portion is provided with first and second electrodes for applying an electric signal to said heat-generating member, said first and second electrodes being provided in a position facing each other with said heat-generating member between them, wherein liquid is bubbled, respectively, in the vicinity of both faces of said heat-generating member, and wherein, if a distance between said first electrode and said second electrode is W1, a heat conduction distance of said heat-generating member at a time of bubbling is d1, and a heat conduction distance of said heat-generating member at the time of bubble extinction is d2, the distance W1 satisfies a condition of 2d112.