| 摘要 |
<p>A flexible reservoir bladder (24) is connected to the base (28) of a pen body to define a reservoir volume (25) that permits nearly all of the ink contained therein to be delivered from the pen by a print head (26). The back pressure developed within the reservoir volume (25) is regulated by the resilient properties of the bladder (24) and an orifice (72) that permits controlled entry of air into the volume as the ink is depleted. The system is able to withstand severe environmental effects, such as a drop in ambient air pressure, while preventing pen leakage. <IMAGE></p> |
