초록 |
Ink jetting system has been developed such that it can understand the jetting status by software algorithms. In order to understand jetting conditions, two different approaches have been used. One is to use the self-sensing capability of the piezo actuator in the printhead. The other is to use the droplet image from a CCD camera for measuring meniscus motion. By the use of self-signal and meniscus motion, the in-situ diagnosis of inkjet system can be possible since it can detect abnormal jetting status such as trapped air bubble in the head. Furthermore, it can measure important ink properties for ink jetting such as speed of sound and viscosity. Finally, systematic waveform design methods have been under development for jetting control such that automatic waveform design be possible based on measured self-sensing signal and meniscus motion. |