Patent ID: 6634741
Filing Date: 2003-10-21
Classification: B41J

Abstract:
An ink jet recording head, comprising:at least one individual passage communicating with a nozzle for jetting ink droplets; a common liquid chamber communicating with each individual passage; an ink chamber for supplying ink to the common liquid chamber; and a communicating passage connecting the common liquid chamber with the ink chamber, wherein: when the jetting rate D of the ink jet recording head is D&gE;0.05, for a bubble having a diameter d that satisfies the following expression (1), the communicating passage having a minimum width L that satisfies the following expression (2) is formed: {(nÃ—VÃ—fÃ—D/S)2Ã—CdÃ—&rgr;Ã—&pgr;Ã—d2}/8&rgr;Ã—gÃ—&pgr;Ã—d3)/6â€ƒâ€ƒ(1) dâ€ƒâ€ƒ(2) where n denotes the number of nozzles, V denotes the volume of an ink droplet jetted from the ink jet recording head, f denotes a maximum printing frequency, S denotes the minimum cross section of the communicating passage, Cd denotes a resistance coefficient, &rgr; denotes the density of ink and g denotes a gravitational constant.