Patent EP0263497A2 successfully refreshed from Google Patents.
EP0263497A2
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EP
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Image reading device
Assignee: Canon Inc
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Filing: 1987-10-06
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Granted: —
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Expires: 2007-10-06
Abstract
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 (129) of a first function at the side of photosensor, and a second layer (130) of another function different from the first function.
Inventors
- 👤 Katsumi Komiyama
- 👤 Masaki Fukaya
- 👤 Kojiro Yokono
- 👤 Hitoshi Toma
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 03:40
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/028; H04N1/03; H04N1/031; H04N1/0315; H04N1/0316; H04N1/0313; H10; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/191
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
112 words
An image reading device comprising: a substrate; an entrance window formed in said substrate and adapted to introduce light for illuminating an information bearing member bearing information to be read; a photosensor receiving the light introduced through said entrance window formed in said substrate and reflected by said information bearing member; and a protective layer formed on said photosensor opposite to said substrate, for maintaining a constant distance between said information bearing member and said photosensor; wherein said protective layer has a multi-layer structure of separate functions comprising a first layer of a first function positioned next to said photosensor, and a second layer of another function different from said first function.
Claim 2
Dependent Claim
112 words
An image reading device comprising: a substrate; an entrance window formed in said substrate and adapted to introduce light for illuminating an information bearing member bearing information to be read; a photosensor receiving the light introduced through said entrance window formed in said substrate and reflected by said information bearing member; and a protective layer formed on said photosensor opposite to said substrate, for maintaining a constant distance between said information bearing member and said photosensor; wherein said protective layer has a multi-layer structure of separate functions comprising a first layer of a first function positioned next to said photosensor, and a second layer of another function different from said first function.
Claim 3
Dependent Claim
19 words
An image reading device according to Claim 1, wherein said photosensor comprises a semiconductor layer composed of amorphous silicon.
Claim 4
Dependent Claim
14 words
An image reading device according to Claim 1, wherein said photosensor is photoconductive type.
Claim 5
Dependent Claim
23 words
An image reading device according to Claim 1, wherein said first layer has a thickness in a range from 0.1 to 10 µm.
Claim 6
Dependent Claim
25 words
An image reading device according to Claim 1, wherein said first layer is composed of a material of alkali ion content not exceeding 1 ppm.
Claim 7
Dependent Claim
32 words
An image reading device according to one of Claims 1 to 5, wherein said first layer is composed of a material of a Vickers hardness lower than that of said second layer.
Claim 8
Dependent Claim
16 words
An image reading device according to Claim 1, wherein said first layer has a multi-layer structure.
Claim 9
Dependent Claim
17 words
An image reading device according to Claim 1, wherein said first layer is packed by another layer.
Claim 10
Dependent Claim
15 words
An image reading device according to Claim 1, wherein said first layer has passivation function.
Claim 11
Dependent Claim
15 words
An image reading device according to Claim 1, wherein said second layer has spacer function.
Claim 12
Dependent Claim
25 words
An image reading device according to Claim 1, wherein said second layer is a surface layer positioned at the outermost part of said protective layer.
Claim 13
Dependent Claim
21 words
An image reading device according to Claim 1, wherein said second layer has a free surface of a low friction coefficient.
Claim 14
Dependent Claim
18 words
An image reading device according to Claim 1, wherein said second layer is composed of a plastic material.
Claim 15
Dependent Claim
17 words
An image reading device according to Claim 1, wherein said second layer is composed of silicone resin.
Claim 16
Dependent Claim
21 words
An image reading device according to Claim 1, wherein said protective layer further comprises a surface layer on said second layer.
References Cited (Backward Citations)
No citation records indexed.
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