Image sensor
First Claim
Patent Images
1. An image sensor comprising:
- an insulating substrate board;
an array of a plurality of blocks on said substrate board, said blocks of said array each including a plurality of photodiodes, a corresponding number of blocking diodes connected respectively in series and opposite polarity to said photodiodes;
a common electrode for said number of said blocking diodes for each of said blocks;
a matrix wiring interconnecting ones of the photodiodes in the same relative positions within respective ones of said blocks;
a transparent interlayer insulating film covering said photodiodes and said blocking diodes formed on said insulating substrate board;
said transparent interlayer insulating film having a contact hole and a coupling electrode passing through said contact hole connecting each of said photodiodes to the corresponding one of said blocking diodes in series and opposite polarity; and
said insulating substrate board being a glass substrate having a thickness of 0.3 to 0.7 mm and a width in the subordinate scanning direction of 1.0 to 2.0 mm, and a ratio of a length in the main scanning direction to the width in the subordinate scanning direction of said glass substrate being not less than about 50 and a ratio of the thickness of said glass substrate to the width in the subordinate scanning direction being not more than 0.7.
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Abstract
The invention relates to an image sensor for use in the facsimile device, image reader, digital scanner and the like. In this image sensor, the photodiodes and blocking diodes formed on an insulating board are insulated by a transparent interlayer insulating film and are connected in series and opposite polarity by coupling electrodes through contact holes in the transparent interlayer insulating film. This image sensor features a high reading speed and a low dark output noise.
25 Citations
19 Claims
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1. An image sensor comprising:
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an insulating substrate board; an array of a plurality of blocks on said substrate board, said blocks of said array each including a plurality of photodiodes, a corresponding number of blocking diodes connected respectively in series and opposite polarity to said photodiodes; a common electrode for said number of said blocking diodes for each of said blocks; a matrix wiring interconnecting ones of the photodiodes in the same relative positions within respective ones of said blocks; a transparent interlayer insulating film covering said photodiodes and said blocking diodes formed on said insulating substrate board; said transparent interlayer insulating film having a contact hole and a coupling electrode passing through said contact hole connecting each of said photodiodes to the corresponding one of said blocking diodes in series and opposite polarity; and said insulating substrate board being a glass substrate having a thickness of 0.3 to 0.7 mm and a width in the subordinate scanning direction of 1.0 to 2.0 mm, and a ratio of a length in the main scanning direction to the width in the subordinate scanning direction of said glass substrate being not less than about 50 and a ratio of the thickness of said glass substrate to the width in the subordinate scanning direction being not more than 0.7. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18)
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17. A contact type image sensor for direct wire bonded connections to driving ICs, each having a predetermined number of drive outputs, and a reading IC having a predetermined number of read inputs, comprising:
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a substrate having an array of blocks and a first side edge; said blocks each containing a plurality of pairs of photodiodes and blocking diodes; drive wirings, each connecting in common, in each of said blocks, said blocking diodes of said blocks; read-out wires, each connecting in common photodiodes of said plurality of photodiodes that occupy the same relative positions in said blocks; said drive wirings having terminating drive terminals arranged in groups wherein each group has a number of drive terminals equal to the predetermined number of drive outputs; said groups each having said drive terminals positioned along said first sides edge substantially in correspondence with a positioning of said drive outputs permitting a direct wire bond connection between said drive terminals and said outputs; and said read-out wires terminating in read-out terminals arranged consecutively positioned in a group along said first side edge permitting direct wire bond connections to said read inputs. - View Dependent Claims (19)
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Specification