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US 6,309,053 B1Granted
Ink jet printhead having a ground bus that overlaps transistor active regions
AssigneeHewlett-Packard Company
InventorsJoseph M. Torgerson, David M. Hurst
Life of this patent
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Abstract
An ink jet printhead having a ground bus that partially overlies active regions of FET drive circuits.
Claims17
An ink jet printing apparatus comprising:
- a printhead structure formed of a substrate and a plurality of thin film layers;
- a columnar array of ink drop generators defined in said printhead structure;
- a columnar array of FET circuits formed in said printhead structure and respectively connected to said ink drop generators, said FET circuits including active regions each comprised of drain regions, source regions, and a gate;
- power traces including a ground bus electrically connected between (a) bond pads and (b) said ink drop generators and said FET circuits;
- and
- said ground bus generally extending along a longitudinal extent of said columnar array of FET circuits, and partially overlying said active regions.
3 more elements
An ink jet printing apparatus comprising:
- a printhead structure formed of a substrate and a plurality of thin film layers, said print head structure having a longitudinal extent and longitudinally separated ends;
- a longitudinal array of ink drop generators defined in said printhead structure and aligned with said printhead longitudinal extent;
- a longitudinal array of FET circuits formed in said printhead structure adjacent said ink drop generators and aligned with said printhead longitudinal extent, said FET circuits respectively connected to said ink drop generators and including active regions each comprised of drain regions, source regions, and a gate;
- bond pads disposed at said longitudinally separated ends;
- power traces including a ground bus electrically connected between (a) said contact pads and (b) said ink drop generators and said FET circuits;
- and
- said ground bus generally extending along said printhead longitudinal extent and partially overlying said active regions.
4 more elements
An ink jet printing apparatus comprising:
- a printhead structure formed of a substrate and a plurality of thin film layers;
- an array of ink jet drop generators defined in said printhead structure;
- an array of FET circuits formed in said printhead structure and respectively connected to said ink drop generators, said FET circuits including active regions each comprised of drain regions, source regions, and a gate;
- power traces including a ground bus electrically connected between (a) bond pads and (b) said ink drop generators and said FET circuits;
- and
- said ground bus partially overlying said active regions.
3 more elements
Dependencies are inferred from the claim text.