farther from the ink supply passage 9 is 10 6 u03bcm in diameter the ink passage 12 and pressure chamber 11 which lead to the orifice 10 b are 12 0 u03bcm and 22 6 u03bcm respectively in width the orifices 10 a which jet 1 4 pl of ink per jetting and the orifices 10 b which jet 2 8 pl of ink per jetting are arranged so that in terms of the direction parallel to the row of orifices 10 a and the row of orifices 10 b the orifices 10 a and 10 b are alternately positioned they are arranged in zig zag pattern in terms of the abovementioned direction the pitch of the ink jetting orifice 10 of chip 3 is 1 200 dpi the distance between an orifice 10 a and the adjacent orifice 10 b is roughly 21 u03bcm the ink passage wall 13 is 9 u03bcm in width the height of the ink passage 12 is 14 u03bcm the orifice portion distance between ceiling surface of pressure chamber 11 of ink passage 12 to the outer opening of orifice 10 of nozzle plate 8 is 11 u03bcm in thickness the thickness of the nozzle plate 8 itself is 25 u03bcm the nozzle filters 14 are 13 u03bcm in diameter and are arranged with a pitch of 1 200 dpi roughly 21 u03bcm in interval there is an epoxy resin layer 17 between the nozzle plate 8 and substrate 7 which is for keeping the nozzle plate 8 adhered to the substrate 7 referring to fig4.