In the past two years, one of the authors published development and analyses works as to a drop on demand piezoelectric line ink jet print head. The print head is composed of a monolithic structure having resolution of 600 dpi in 108 mm print width. It is provided with 2,656 nozzles with corresponding pressure chambers, or cavities, in an area of 108 x 16.8 mm. This print head was originally designed to generate drops of 3 17 /14 /21 pL at 20 kHz firing frequency for 600 x 600 dpi 4 grades grayscale printing at paper feeding rate of 847 mm/s. The authors have expanded its capability in firing frequency to 24 kHz with 3 / 7 /9 /12 pL drops. The higher frequency allows printing rate of 1,016 mm/s for paper feeding in the same resolution. In general, the faster printing requires more unity in drop formation to make pixels on a substrate shaped finely, which is inadequate for the original design. Therefore, modifications are made with the print head in its actuator and a cavity structure in order to unify drops for each pixel more consistently. Specifically, unimorph actuator thickness, cavity shape and depth are examined so that residual vibration in a channel might not break up a ligature during drop formation. As a result, the print head is improved in its printing speed as referred above.
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机译：在过去的两年里，作者之一发表了开发，分析到需求压电线喷墨打印头的下降。打印头由108mm打印宽度的分辨率为600dpi的整体结构组成。它设置有2,656个喷嘴，其具有相应的压力室或空腔，面积为108×16.8mm。该打印头最初设计用于在20 kHz烧制频率下产生317 / 14/21 PL的液滴600 x 600 DPI 4等级灰度印刷，纸张进料速率为847 mm / s。作者将其在烧制频率的能力扩展到24 kHz，3 / 7/9/12 PL滴。较高的频率允许以相同的分辨率馈送1,016mm / s的印刷速率。通常，更快的打印需要更高的液滴形成统一，以便在精细设计的基板上制造像素，这对于原始设计不充分。因此，在其致动器和腔结构中使用打印头进行修改，以便更始终如一地统一每个像素的滴度。具体地，检查单身致动器厚度，腔体和深度，使得通道中的残余振动可能在滴形成期间不会分解结扎。结果，如上所述，打印头的打印速度得到改善。
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