The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2002
Filed:
Aug. 23, 2000
Fumio Murooka, Atsugi, JP;
Kei Fujita, Kawasaki, JP;
Yukihiro Hayakawa, Yokohama, JP;
Makoto Terui, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
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.