Title:
プリントヘッド
Document Type and Number:
Japanese Patent JP4536308
Kind Code:
B2
Abstract:
Novel designs and methods of manufacture of ink-jet printheads capable of providing ink-droplet-tail-break-off control and preventing meniscus overshoot in order to overcome the puddling, pen directionality, and ruffle problems associated with thermal-ink-jet printing are disclosed. A printhead for use in an ink-delivery system includes a substrate that has at least one ink ejector thereon. An orifice-plate member is positioned over and above the substrate. The orifice-plate member has at least one ink-transfer bore extending therethrough. The orifice-plate member further includes: a top surface that defines a top opening for the ink-transfer bore, a bottom surface that defines a bottom opening for the ink-transfer bore, and a counter-bore in the top surface that is in fluid communication with the ink-transfer bore. The counter-bore can be: concentric or non-concentric with the ink-transfer bore, a full or partial counter-bore, and symmetric or asymmetric. In addition, the counter-bore can also be deep enough to hold the ink meniscus. Lastly, the counter-bore can smooth, round and/or provide a more uniform edge around the ink-transfer bore. By providing one or more combinations of these features, the present invention is able to control the tail break-off of expelled ink-jet droplets and/or minimize meniscus overflow.
Inventors:
Coolian, Kenneth Jay
Ager Wal, Alan Kay
Ager Wal, Alan Kay
Application Number:
JP2001521553A
Publication Date:
September 01, 2010
Filing Date:
September 01, 2000
Export Citation:
Assignee:
HEWLETT-PACKARD COMPANY
International Classes:
B41J2/045; B41J2/05; B41J2/055; B41J2/14; B41J2/16
Domestic Patent References:
| JP10235872A | ||||
| JP6286129A | ||||
| JP6079874A | ||||
| JP5077425A | ||||
| JP10235874A | ||||
| JP4339659A | ||||
| JP4348948A |
Attorney, Agent or Firm:
Shoichi Okuyama
Arihara Koichi
Matsushima Tetsuo
Arihara Koichi
Matsushima Tetsuo