Patent ID: 6513914
Filing Date: 2003-02-04
Classification: B41J

Abstract:
A liquid discharging head, comprising:a plurality of heat-generating elements for generating thermal energy for generating bubbles in a liquid; a plurality of discharging orifices corresponding respectively to said plurality of heat-generating elements, whereby the liquid is discharged; a plurality of channels connecting respectively to said plurality of discharging orifices and each having a bubble generating area for generating a bubble in the liquid; a plurality of movable members provided respectively in said bubble generating areas of said channels and corresponding respectively to said plurality of heat-generating elements, each said movable member having a free end which is displaced in accordance with growth of the bubble; a plurality of restricting portions provided respectively in said plurality of channels and corresponding respectively to said plurality of movable members, for restricting an amount of movement of said movable members, respectively; and a common liquid chamber connected to each of said channels, for supplying the liquid to each of said channels, wherein said heat-generating elements are grouped into a plurality of blocks, said blocks of heat-generating elements are sequentially driven in time-division, said heat-generating elements within any given block discharge the liquid substantially simultaneously, and the liquid is discharged from said discharge orifices by means of the bubbles being generated, and wherein said plurality of restricting portions includes a first restricting portion and a second restricting portion, said second restricting portion having a form such as to generate a fluid resistance to flow of the liquid from a side of said discharging orifice toward said common liquid chamber which is greater than a fluid resistance to flow of the liquid from the side of said discharging orifice toward said common liquid chamber generated by said first restricting portion, and said first and second restricting portions being provided in adjacent channels, said second restricting portion being provided in a different channel from that in which said first restricting portion is provided.