| 摘要 |
<p>The technique of the present invention prevents a variation in hitting positions of two different types of ink droplets (IPs, IPm) ejected in two pixels, which adjoin each other in a main scanning direction, in response to a first driving pulse and a second driving pulse. The process of the invention drives each piezoelectric element on a print head in response to a driving signal, which may selectively include two different driving pulses in one recording cycle. When one dot is created in each of two adjoining pixels in the main scanning direction, either a driving signal A or a driving signal B is generated to control the dot creation. The driving signal A includes a first pulse in a first cycle and a second pulse in a second cycle, whereas the driving signal B includes the second pulse in the first cycle and the first pulse in the second cycle. The process regulates an ejecting speed (Vm1) of a small ink droplet (IPs) corresponding to the first pulse, an ejecting speed (Vm2) of large ink droplet (IPm) corresponding to the second pulse, and a variation in time difference between the ejecting timing of the first ink droplet and the ejecting timing of the second ink droplet in the case of a driving signal A and in the case of a driving signal B, according to a platen gap. This enables a distance (S3) between the hitting positions of the small ink droplet (IPs) and the large ink droplet (IPm) in the case of the driving signal A to be equal to a distance (S13) between the hitting positions of the small ink droplet (IPs) and the large ink droplet (IPm) in the case of the driving signal B. <IMAGE></p> |
