Contact Image Sensor Module with Variable Width Photosensing Elements
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Solution Overview
Problem
Contact image sensor modules with linear arrays of discontinuous photosensing elements result in discontinuous image frames due to gaps between elements, which is problematic for scanning documents of varying sizes, particularly small-sized documents like photographs and films.
Innovation Solution
A photosensing array with a combination of first and second photosensing elements of different widths, where the first width is greater than the second, arranged in a line with the first element positioned in the middle or at the ends, minimizes gaps and ensures complete scanning of documents by matching the wider element with the shorter document side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear array of discontinuous photosensing elements of the same size is used, then the device complexity is reduced and manufacturing is simplified, but gaps appear between adjacent elements causing discontinuous image frames
Solution Approach 1:
The patent applies local quality by using photosensing elements of different widths at different positions in the array. Specifically, the first photosensing elements have a first width while the second photosensing elements have a second width, with the relationship that the first width plus gap width is less than the second width plus gap width. This local differentiation allows the array to maintain continuity for documents of various sizes while keeping the overall structure manageable.
2Device complexity
If photosensing elements of uniform size are used, then the photosensing array structure is simplified, but the array cannot completely receive optical signals from small-sized documents
Solution Approach 1:
The patent implements local quality by configuring different photosensing element widths at different positions. The first photosensing elements (with first width) are positioned to handle larger documents, while the second photosensing elements (with smaller second width) are positioned for small-sized documents. This ensures that the optical signals from documents of any size are completely received without loss, while maintaining a relatively simple array structure.
3Ease of manufacture
If a standard linear array with gaps between elements is used, then the manufacturing process is simplified, but discontinuous image frames occur during scanning
Solution Approach 1:
The patent applies parameter changes by varying the width parameter of photosensing elements based on their position in the array. The first photosensing elements have a first width while the second photosensing elements have a second width, creating a gradient structure. This parameter variation allows the array to maintain image continuity and quality while keeping the manufacturing process relatively simple through systematic dimensioning.
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 design significantly reduces the occurrence of discontinuous image frames, especially for small-sized documents, by ensuring that the wider photosensing elements cover the shorter dimensions of the document, enhancing scanning efficiency and image quality.
Implementation Method 1
a light source for emitting a light beam to the document, thereby generating an optical signal
Implementation Method 2
a lens assembly for focusing the optical signal reflected from the document and imaging the optical signal onto the photosensing array
Implementation Method 3
The photosensing array is used for converting the optical signal into an electronic signal
Data Source
AI summary
A contact image sensor module for scanning a document includes a light source, a photosensing array and a lens assembly. The light source emits a light beam to the document, thereby generating an optical signal. The photosensing array is used for converting the optical signal into an electronic signal. The lens assembly is used for focusing the optical signal reflected from the document and imaging the optical signal onto the photosensing array. The photosensing array includes a first photosensing element with a first width and a second photosensing element with a second width. The first width is greater than the second width.