Sensor Board Convex Portions for Image Sensor Alignment
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Solution Overview
Problem
Existing image scanners face challenges in achieving high accuracy in the arraying of sensor chips between sensor boards, leading to potential gaps and reduced image quality when reading large objects.
Innovation Solution
A light receiving unit and image sensor design where sensor chips are mounted on convex portions of sensor boards that protrude in the longitudinal direction, allowing for precise alignment and positioning on a sensor plate, ensuring accurate spacing and minimizing gaps between adjacent sensor chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensor boards are arrayed in a line to read large objects, then the reading coverage is improved, but the mounting accuracy of sensor chips between adjacent sensor boards deteriorates
Solution Approach 1:
Position adjustment portions are introduced as intermediary components between sensor boards to enable precise positioning. These portions include positioning protrusions and positioning recesses that act as mediators to achieve accurate alignment and mounting of sensor chips across adjacent sensor boards, resolving the accuracy issue while maintaining extended reading coverage.
2Device complexity
If sensor chips are mounted flush with sensor board edges, then the structure is simplified, but pixel gaps occur between adjacent sensor chips
Solution Approach 1:
The sensor boards are designed with differentiated local structures: most areas have standard flat surfaces for mounting, while specific edge regions have protruding portions that extend beyond the board edge. This local quality variation allows sensor chips to be mounted with their light-receiving surfaces extending beyond the board edge, ensuring continuous pixel coverage without gaps while maintaining overall structural simplicity.
3Reliability
If connection means are added to prevent damaging sensor chips, then reliability is improved, but the complexity of the structure increases
Solution Approach 1:
The protective connection structure is merged with the positioning structure. The positioning protrusions and positioning recesses serve dual functions: they provide precise alignment for mounting accuracy and simultaneously act as protective connection means to prevent damage to sensor chips during assembly and operation. This merging eliminates the need for separate protective components, maintaining reliability while avoiding increased complexity.
Data Source
AI summary
A light receiving unit including: a sensor board assembly on which plural sensor tips are arrayed in a line in a longitudinal direction of the sensor board and mounted on the sensor board; and a sensor plate on which plural of the sensor board assemblies are arrayed and mounted in a line in the longitudinal direction. The sensor chips include plural pixels formed in a line in the longitudinal direction. At longitudinal ends of the sensor board assembly, the sensor chips protrude outward in the longitudinal direction from the longitudinal ends. Between the facing sensor chips of the adjacent sensor board assemblies, the facing sensor chips mounted at the longitudinal ends, the ends of the facing sensor chips are spaced at a predetermined interval. The sensor board includes convex portions, at the longitudinal ends, protruding in the longitudinal direction. The sensor chips are mounted at the convex portion.