Flatbed Scanner Carriage Speed Control for Large Originals
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Solution Overview
Problem
Flatbed scanners face challenges in achieving high reading speed without increasing product size, as the carriage cannot be fully decelerated after reading, leading to potential contact with the housing, especially when handling larger originals at higher resolutions.
Innovation Solution
The scanner adjusts the carriage's moving speed based on the original's size, reading at a higher speed for smaller originals and a lower speed for larger ones, with distinct deceleration procedures to prevent carriage contact with the housing, and adjusts reading times accordingly to accommodate different original sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the carriage moving speed is increased to improve reading speed, then productivity is improved, but the carriage cannot be fully decelerated before contact with the housing occurs
Solution Approach 1:
The patent applies dynamics by making the carriage speed variable rather than constant. The control portion dynamically adjusts the carriage speed based on the original size: higher speeds for smaller originals and lower speeds for larger originals. This dynamic speed adjustment ensures that the carriage can be fully decelerated within the available distance for large originals while maintaining high reading speed for smaller originals, thus resolving the contradiction between productivity and reliability.
2Productivity
If the carriage moving speed is increased to reduce reading time, then productivity is improved, but the product size must be increased to accommodate the braking distance
Solution Approach 1:
The patent applies parameter changes by adjusting the carriage speed parameter according to the original size. Instead of increasing the product size to accommodate a fixed high speed, the system changes the speed parameter dynamically: using higher speeds for small originals and lower speeds for large originals. This allows high productivity to be maintained for smaller documents without requiring increased product size, while larger documents are handled at reduced speeds that fit within the existing product dimensions.
3Productivity
If the carriage moves at high speed to improve reading efficiency, then productivity is improved, but measurement precision of the reading image deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the carriage speed parameter based on original size to balance productivity and measurement precision. For small originals, higher speeds maintain productivity while the shorter distance naturally limits quality degradation. For large originals, lower speeds are used to maintain image quality over the longer scanning distance, while still achieving overall high productivity through optimized speed selection rather than uniformly high speed.
Data Source
AI summary
A flatbed scanner includes a carriage for reading an original while moving in a first direction; an acquisition portion for acquiring a size of the original in the first direction; and a control portion for reading the original while moving the carriage at a lower speed in a first case where the original is large than in a second case where the original is small.