| 摘要 |
PURPOSE: To provide an ink jet recorder which can record at a high speed with high image quality. CONSTITUTION: A driving circuit 106 is so controlled at the applying time of a drive signal to a piezoelectric element 101 as to vary the number of ink droplets discharged from the liquid surface of a liquid ink 109 in response to the gradation level of an image recorded on a recording medium. An ultrasonic wave radiated from a piezoelectric element array 101 is converged in an array direction in response to the application of the signal, incident to an acoustic lens 107 via an acoustic matching layer 105, converged in the direction perpendicular to the array direction, and converged in a point state near the ink liquid level. An ink meniscus 111 is formed by the pressure (radial pressure) generated by the converted wave near the ink liquid level, an ink droplet responsive to the applying time is discharged from the end, and stuck to the discharged ink droplet recording medium. |
