| 摘要 |
<p>A thermal ink jet printhead (Figs 1 and 2) has heating element structures (18) which space the portion (33) of the heating element structures subjected to the cavitational forces produced by the generation and collapsing of the droplet expelling bubbles (26) from the upstream electrode interconnection (36) to the heating element. In one embodiment (Figs 4 and 4B) this is accomplished by narrowing the resistive area where the momentary vapor bubbles are to be produced so that a lower temperature section (34) is located between the bubble generating region (33) and the electrode connecting point (36). In another embodiment (Fig. 5), the electrode (17) is attached to the bubble generating resistive layer (31) through a doped polysilicon descender (38). A third embodiment (Fig. 6) spaces the bubble generating portion (54) of the heating element from the upstream electrode interface, which is most susceptible to cavitational damage, by using a resistive layer (52,54) having two different resistivities.</p> |
