| 摘要 |
PROBLEM TO BE SOLVED: To obtain a quality image with less cross talks from a surrounding cavity not causing any deviation out of dot positions, in a print head wherein cavities are arranged in a matrix order. SOLUTION: When it is defined that the number of layers of piezoelectric elements is N, the number of active layers of piezoelectric elements is A , an inner angle less than 90°in a virtual lattice including the cavity isα[°], an occupied area of the virtual lattice is Spin [mm2], an occupied area of a cavity is Scav [mm<SP>2</SP>], an occupied area of an active part in the piezoelectric element provided in the cavity is Spzt [mm<SP>2</SP>], an angle and dimension of each section are fixed so as to satisfy the relevant formula (1): KOxN<SP>aO</SP>xA<SP>bO</SP>xα<SP>cO</SP>xSpin<SP>do</SP>x(Scav/Spin)<SP>eO</SP>x(Spzt/Scav)<SP>fO</SP>≤O.1, wherein aO=1.87686, bO=0.31786, cO=-0.18649, dO=-1.09273, eO=3.97019, fO=0.93332 and KO=0.05307. COPYRIGHT: (C)2004,JPO
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