| 摘要 |
PURPOSE:To obtain the captioned head wherein the thermal energy acts, with high efficiency, on the liquid located in a heat action part and which has excellent thermal responsiveness by making the thickness of an upper layer, a heating-resisting layer and a lower layer, all constituting the heat-generating part of an electro-thermal transducing body, meet the specific mutual relations. CONSTITUTION:An electro-thermal transducing body 2 is prepared by laminating a lower layer 10, a heating-resisting layer 11 and an upper layer 12 in this order from the side of a substrate 3. When the thickness of each layer L1, LH and L2 is in the relation of L=L1+LH+L2, it meets the formula I and the formula II [A=St/Q. DELTAT.(k1beta2+k2beta1)/(beta1+beta2); B=k2LH/kH; beta1= (C1rho1k1)<1/2>; beta2=(C2rho2k2)<1/2>; where C1 and C2 are the specific heat of the upper and lower layers; k1, k2 and kH are the thermal conductivity of the upper, lower and heating-resisting layers; rho1 and rho2 are the density of the upper and lower layers; gamma is the width of half value of an inputted electric signal to the transducing body 2; t is the interval of input; S is the area of the heat action surface of the upper layer; DELTAT is the average value of the difference between the surface temperature of the heat action surface 9 and the temperature of the surface of the lower layer on the side of the substrate and Q is the heating quantity per the electric signal). |
