EP0292318A2
Expired / Lapsed
EP
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Direct-contact-type image sensor
Assignee: Oki Electric Industry Co Ltd
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Filing: 1988-05-20
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Granted: —
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Expires: 2008-05-20
Abstract
Abstract In a contact-type image sensor comprising an array of photosensor elements for receiving light reflected from a document, and a protective layer disposed above the array of photosensor elements for protecting the array of photosensor elements when contact is made with the document, means are provided for discharging electric charges accumulated on the protective layer. This may comprise the protective layer with a relatively low resistivity or a separate conductive layer above or within the protective layer.
Inventors
- 👤 Hiroaki Kakinuma
- 👤 Yukio Kasuya
- 👤 Masaaki Sakamoto
- 👤 Tsukasa Watanabe
- 👤 Mikio Mouri
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 13:20
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: 14
Claim 1
Independent Claim
52 words
A contact-type image sensor comprising an array of photosensor elements for receiving light reflected from a document, a protective layer disposed above said array of photosensor elements for protecting said array of photosensor elements when contact is made with said document, and means for discharging electric charges accumulated on said protective layer.
Claim 2
Dependent Claim
52 words
A contact-type image sensor comprising an array of photosensor elements for receiving light reflected from a document, a protective layer disposed above said array of photosensor elements for protecting said array of photosensor elements when contact is made with said document, and means for discharging electric charges accumulated on said protective layer.
Claim 3
Dependent Claim
53 words
An image sensor according to claim 1, wherein at least that portion of said protective layer that makes contact with said document is made of a material with a resistivity of 10¹⁴ ohm·cm or less, and is connected to a common electrode of said photosensor array to act also as said discharging means.
Claim 4
Dependent Claim
18 words
An image sensor according to claim 2, wherein the resistivity of said material is 10¹³ ohm·cm or less.
Claim 5
Dependent Claim
50 words
An image sensor according to claim 2, wherein said photosensor array is formed of a photoelectric converting semiconductor and that part of the protective film which is in contact with the photoelectric converting semiconductor is made of a material with a resistivity in the range of 10¹¹ to 10¹⁴ ohm·cm.
Claim 6
Dependent Claim
46 words
An image sensor according to claim 2, wherein said protective film is formed of amorphous silicon carbide (a-SiC), amorphous carbon (a-C), Si-rich amorphous silicon nitride (a-SiN x ), amorphous silicon oxide (a-SiO x ), or AlSiN, AlSiON, SiON, Al₂O₃, Ta₂O₅, TiO₂, ZrO₂, BN, AlN, or MgO.
Claim 7
Dependent Claim
22 words
An image sensor according to claim 1, wherein said discharging means comprises a conductive layer provided within or above said protective layer.
Claim 8
Dependent Claim
22 words
A contact-type image sensor according to Claim 6, wherein said conductive layer is connected to a common electrode of said photosensor array.
Claim 9
Dependent Claim
36 words
An image sensor according to claim 1, further comprising a transparent conductive film formed on the surface of said protective film or in the interior of said protective film and connected to said first electrode layer.
Claim 10
Dependent Claim
44 words
An image sensor according to claim 1, further comprising a substrate; and a first electrode layer formed as a common electrode on said substrate; wherein said photosensor element array is formed in a photoelectric-converting semiconductor layer that is formed on said first electrode layer.
Claim 11
Dependent Claim
19 words
An image sensor according to claim 9, wherein an array of light-admitting windows are provided through the photosensor layer.
Claim 12
Dependent Claim
13 words
An image sensor according to claim 1, wherein said protective film is transparent.
Claim 13
Dependent Claim
58 words
An image sensor comprising a plurality of photosensor elements (23) and a protective covering (42) for the elements, the sensor being so arranged that when a document is swept relative thereto in contact with the covering said elements sense an image on the document, characterised by means (46) for inhibiting electrostatic charge building up on said covering (42)
Claim 14
Dependent Claim
58 words
An image sensor comprising a plurality of photosensor elements (23) and a protective covering (42) for the elements, the sensor being so arranged that when a document is swept relative thereto in contact with the covering said elements sense an image on the document, characterised by means (46) for inhibiting electrostatic charge building up on said covering (42)
References Cited (Backward Citations)
No citation records indexed.
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