| 摘要 |
In an ink jet recording head according to the present invention in which a small ink droplet and a large ink droplet can be discharged, a common liquid chamber 6 is connected to discharge ports 3a and 3b via ink flow paths 5a and 5b and pressure chambers 4a and 4b, and ink droplets are discharged from the discharge ports 3a and 3b by utilizing thermal energy of heaters 7a and 7b. Widths of the ink flow paths 5a and 5b are narrower than widths of the pressure chambers 4a and 4b so that the ink flow paths 5a and 5b act as restriction portions. When it is assumed that a sectional area of the small liquid droplet ink flow path is SS, a sectional area of the small liquid droplet pressure chamber is SRS, a sectional area of the large liquid droplet ink flow path is SL and a sectional area of the large liquid droplet pressure chamber is SRL, a relationship SS/SRS < SL/SRL is established. According to the present invention, with this arrangement, even in the nozzle for discharging the small ink droplet, loss is reduced and energy efficiency can be enhanced. <IMAGE>
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