Rod-Lens Array Positioning in Image Sensor Units
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Solution Overview
Problem
Accurately positioning and fixing rod-lens arrays in image sensor units for reading large originals is challenging due to the difficulty in aligning them within thin grooves, affecting the focus of reflected light.
Innovation Solution
The image sensor unit is designed with a frame body divided into a first and second frame, where the side surfaces of the rod-lens arrays are fixed only by the first frame, allowing for accurate arrangement in the main-scan direction, and using a jig for precise adhesive application to secure the arrays at predetermined intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If rod-lens arrays are inserted into thin grooves of frames for positioning, then the structure is compact, but accurate positioning becomes significantly difficult
Solution Approach 1:
The frame body is divided into a first frame and a second frame that are coupled together. The rod-lens arrays are positioned in grooves of the first frame, while the second frame provides additional support and coupling. This segmentation allows for easier positioning and assembly of the rod-lens arrays while maintaining structural compactness.
2Length of moving object
If multiple rod-lens arrays are arranged in series to read large originals, then the read length is extended, but the complexity of accurate positioning increases
Solution Approach 1:
The frame body is segmented into first and second frames that can be assembled separately. The rod-lens arrays are positioned in the first frame's grooves, and the second frame is coupled to provide additional support. This segmentation simplifies the positioning process for multiple rod-lens arrays arranged in series, making assembly more manageable while achieving extended read length.
Solution Approach 2:
The first and second frames act as intermediary structures that facilitate the positioning and coupling of multiple rod-lens arrays. The grooves in the first frame and the coupling mechanism with the second frame provide intermediate positioning stages, reducing the overall positioning complexity for achieving extended read length.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables accurate and efficient alignment of rod-lens arrays, improving workability and ensuring focused light is directed onto sensor chips, enhancing image reading capabilities for large originals.
Implementation Method 1
a plurality of rod-lens arrays that focus light from an object to be read on the sensor substrates
Data Source
AI summary
An image sensor unit includes: sensor substrates on which a plurality of sensor chips are mounted; a plurality of rod-lens arrays that focus light from an original on the sensor substrates; and a frame body that houses the plurality of sensor substrates and the plurality of rod-lens arrays. The frame body is divided into a first frame and a second frame. A side surface of the plurality of rod-lens arrays in a sub-scan direction is fixed only by the first frame, and the plurality of rod-lens arrays are arranged in the main-scan direction. The plurality of rod-lens arrays is fixed to the first frame by applying a first adhesive and a second adhesive, respectively, the viscosity of the first adhesive exceeds the viscosity of the second adhesive, and the adhesive range of the first adhesive is greater than the adhesive range of the second adhesive.