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:
May. 08, 1990
Filed:
Jul. 25, 1989
Katsumi Komiyama, Isehara, JP;
Masaki Fukaya, Isehara, JP;
Kojiro Yokono, Yokohama, JP;
Hitoshi Toma, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image reading device has an entrance window provided in a substrate and receiving the light illuminating an information bearing member bearing information to be read. A photosensor is provided on the substrate for receiving the light that has entered through the entrance window and has been reflected by the information bearing member. Further, a protective layer is formed on the photosensor opposite to the substrate, in order to maintain a constant distance between the information bearing member and the photosensor, and has a multi-layer structure of separate functions, comprising a first layer of a first function at the side of photosensor, and a second layer of another function different from the first function.