Adjustable Lens Arrangement for Document Scanning Speed
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Solution Overview
Problem
Existing document scanning devices struggle to adapt to varying resolution requirements efficiently, often requiring costly and time-consuming exchanges of optoelectronic line sensors and optics to balance scanning speed and image quality.
Innovation Solution
A scanning device with a lens arrangement that images light reflected by the document onto either all or a portion of the image detection elements, allowing for reduced resolution scanning with increased speed by reading out only the signals from the relevant image detection elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution is increased to record photos with optimally high quality, then the image quality is improved, but the scanning speed decreases
Solution Approach 1:
The patent applies dynamics by making the optical system adjustable between different positions. The lens arrangement can be moved to change the imaging relationship between the document and the line sensor, allowing dynamic adaptation between high-resolution photo scanning and lower-resolution text scanning modes, thus resolving the contradiction between image quality and scanning speed.
Solution Approach 2:
The patent changes the optical parameters by adjusting the lens arrangement position to alter the magnification and imaging characteristics. This allows the system to switch between recording modes (photo vs. text) by modifying the optical parameters, enabling high scanning speed for text while maintaining the capability for high-resolution photo scanning when needed.
2Adaptability or versatility
If the optoelectric line sensor and optics are exchanged to adapt to different resolution requirements, then the adaptability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent implements universality by designing a single optoelectric line sensor system that can perform multiple functions through optical adjustment. The same sensor and optics can scan both high-resolution photos and lower-resolution text by changing the lens arrangement position, eliminating the need for multiple specialized sensors and reducing device complexity and cost.
Solution Approach 2:
The patent makes the optical system dynamic and adjustable, allowing one set of optics to serve multiple resolution requirements. The lens arrangement can be positioned differently to adapt to various scanning needs, providing versatility without requiring physical exchange of components, thus reducing technical expenditure and simplifying the device.
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
Enables faster scanning at reduced resolution with minimal effort, maintaining a similar number of recorded image elements as at higher resolution, thus enhancing scanning speed without compromising image quality.
Implementation Method 1
light-sensitive cells are linearly arranged in a line in order to determine (with the aid of an electrical signal) the intensity of the light impinging on these light-sensitive cells
Data Source
AI summary
A device for scanning a document is provided. A document placed on a support surface is scanned line by line by a camera that is provided with an optoelectronic line sensor, and electric signals are produced. The line sensor includes a plurality of image recording elements disposed in a linear orientation. A lens system is used to image the light reflected by the document to be captured onto a part of the image recording elements.