| 摘要 |
An ink jet apparatus applies a drive voltage to electrodes formed on portions of side walls made of piezoelectric ceramics and varies the internal volumes of grooves adjacent to the side walls using the action of a deformation produced by a piezoelectric thickness/slip effect of the piezoelectric ceramics. Thereby, ink stored inside the grooves is ejected. According to such an ink jet apparatus, a void ratio of the piezoelectric ceramic is 10% or less, and an average crystal grain diameter of the piezoelectric ceramics is 10 mu m or less. Further, a variation in a ratio d15/SE44 of a piezoelectric constant d15 of the piezoelectric ceramic to an elastic compliance SE44 thereof between the side walls falls within 4. A ratio H/W of a height H of each side wall to a width W thereof ranges from above 2 to below 9, and a ratio d15/SE44 of a piezoelectric constant d15 of the piezoelectric ceramic to an elastic compliance SE44 thereof is 10 or more. It is thus possible to provide an ink jet apparatus having excellent durability and high reliability. <IMAGE> |
