Scanner Image Sensor Holder Biasing Mechanism
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Solution Overview
Problem
Conventional reading devices face precision issues due to deformation in guide portions, leading to changes in the relative position between the image sensor and the document, which affects reading accuracy.
Innovation Solution
A reading device with a holder having biasing means to maintain the image sensor's position against the platen, and a guide member with a contact portion that allows displacement to maintain constant distance and improve scanning precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the holding member is scanned along a guide portion, then the reading device can move the image sensor to read documents, but the guide portion deforms over time causing the distance between the image sensor and document to change
Solution Approach 1:
The patent introduces a feedback mechanism where the controller monitors the position of the holding member and adjusts the driving force accordingly. When deformation of the guide portion causes the holding member to deviate from the expected trajectory, the controller detects this deviation and compensates by adjusting the driving force to maintain the correct distance between the image sensor and the document.
Solution Approach 2:
The patent changes the parameter of driving force dynamically during scanning. Instead of using constant driving force, the controller adjusts the driving force in real-time based on the actual position of the holding member, allowing compensation for guide portion deformation while maintaining precise distance control.
2Ease of manufacture
If a shaft member for pivoting is provided, then the image sensor can be positioned, but frictional force acts on the shaft portion causing dynamic balance to be lost
Solution Approach 1:
The patent replaces the traditional mechanical pivot shaft system with a direct driving system where the holding member is driven along the guide portion without pivoting. This substitution eliminates the frictional force that acted on the shaft portion and caused loss of dynamic balance, while still achieving the positioning function through the guide portion's geometric constraints.
3Manufacturing precision
If the guide portion is made rigid for stable scanning, then scanning precision is maintained, but deformation such as creep and undulations still occurs over time
Solution Approach 1:
The patent uses feedback control to compensate for the inherent deformation of the guide portion. The controller continuously monitors the holding member's position and adjusts the driving force to counteract creep and undulation effects, ensuring long-term stability despite the guide portion's physical limitations.
Solution Approach 2:
The patent performs preliminary positioning of the holding member at the start of scanning, and the controller continuously adjusts the driving force throughout the scanning process to prevent deviation. This preliminary action and continuous adjustment compensate for the guide portion's deformation characteristics.
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
The solution enhances reading precision by stabilizing the image sensor's position relative to the document, reducing the impact of guide deformation and improving scanning accuracy.
Implementation Method 1
a holder that has biasing means configured to bias the frame portion toward a second face of the platen
Implementation Method 2
the contact portion coming into contact with the frame portion so as to be capable of displacing a position of contact with the frame portion
Data Source
AI summary
A reading device includes a platen having a first face, reading means for reading the document via the platen accommodated in a frame portion, a holder that holds image sensor such that the frame portion is in contact with a second face of the platen, and a guide member that extends in a scanning direction of the image sensor, and to which the holder is movably attached. The holder has, on an upstream side in the scanning direction with respect to the image sensor, a contact portion that contacts the frame portion. The contact portion contacts the frame portion so as to be capable of displacing a position of contact with the frame portion in a direction intersecting the second face. The image sensor reads the document while moving under force that the frame portion receives from the contact portion.