| 摘要 |
<p>A spot size modulatable, drop-on-demand type ink jet printhead (32) and associated methods for ejecting volume modulatable droplets of ink therefrom. The ink jet printhead (32) includes a main body portion (34) having first and second ink carrying channels (50a, 50b, 50c, 50d) longitudinally extending therethrough and a cover plate (42) fixedly mounted thereto. Formed in the cover plate (42) is a tapered orifice (48a, 48b) which extends from first and second openings (50, 52) along a back side surface to a third opening (54) along a front side surface thereof. The cover plate (42) is mounted to the main body portion (34) such that the first opening (50) is in communication with the first ink carrying channel (50a, 50c) and the second opening (52) is in communication with the second ink carrying channel (50b, 50d). The ink jet printhead (32) further includes first and second actuators (50a, 50b, 50c, 50d) coupled with the first and second ink carrying channels respectively. Volume modulatable droplets of ink may be ejected from the ink jet printhead (32) by simultaneously applying a voltage pulse having a selected magnitude to the first ink carrying channel and a voltage pulse having a magnitude ranging between zero and the selected magnitude to the second ink carrying channel. Alternately, volume modulatable droplets of ink may be ejected from the ink jet printhead by sequentially applying a voltage pulse having a selected time duration to the first ink carrying channel and a voltage pulse having a time duration ranging between zero and the selected time duration to the second ink carrying channel.</p> |
