Substrate unit for liquid discharging head, method for producing the same, liquid discharging head, cartridge, and image forming apparatus
US6467884B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2000 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Nov 2, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/28
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
To provide a substrate unit for liquid discharging head, a method for producing the same, a liquid discharging head, a cartridge, and an image forming apparatus. The substrate unit for liquid discharging head is for a head which gives thermal energy to the liquid for film boiling, to discharge droplets of the liquid from its discharge port. The substrate unit includes an electrothermal transducer provided on the substrate surface to generate thermal energy, a pair of electrode wiring circuits provided on the substrate surface and connected to the transducer, first protective layer formed over the substantially entire surface of the substrate to cover a pair of the electrode wiring circuits and transducer, and second protective layer formed over the first protective layer to cover the transducer and the area where the transducer is connected to the wiring circuit, in which a pair of the electrode wiring circuits are 1800 to 2400 å thick, and the portion of the first protective layer covered by the second protective layer is 2600 to 3400 å thick and thicker than the portion of the first protective layer not covered by the second protective layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.