CIS Sensor Shock Absorption via Dual Spring Mechanism
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Solution Overview
Problem
Conventional image reading devices face challenges in shock absorbance and damage prevention during transportation and operation, particularly due to the rigidity and posture changes of contact image sensors, which can lead to deformation and contact with the original table.
Innovation Solution
An image reading device design featuring a holder that allows the image sensor to be movable and abuttable on the original table, with a pressing unit to maintain contact and a pulling unit to separate from the table during external forces, ensuring the sensor's safety and maintaining a constant gap for accurate reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the contact image sensor is made rigid to suppress deformation, then image reading precision is improved, but shock absorbance deteriorates
Solution Approach 1:
The contact image sensor is divided into a sensor body and a separate support structure. The sensor body remains rigid for precise imaging, while the support structure provides flexibility and shock absorption. This segmentation allows each component to optimize its function independently.
Solution Approach 2:
A cushioning structure is provided in advance between the contact image sensor and the original table. This cushioning layer absorbs shocks and vibrations before they can reach the sensor, protecting the rigid sensor from damage while maintaining imaging precision.
2Measurement precision
If the contact image sensor is fixed closely to the original table, then image reading precision is improved, but adaptability to external forces deteriorates
Solution Approach 1:
The support structure is designed to be dynamically adjustable. Under normal conditions, it maintains close contact for precise imaging. When external forces are applied, the structure can dynamically adjust its position to absorb the force while keeping the sensor aligned with the original table.
Solution Approach 2:
The support structure changes its physical parameters (such as stiffness or position) based on external conditions. It maintains a fixed gap under normal operation for precise imaging, but can change its configuration when subjected to external forces to protect the sensor while maintaining adaptability.
3Measurement precision
If the gap between the contact image sensor and original table is maintained constant, then image reading precision is improved, but shock absorbance deteriorates
Solution Approach 1:
A cushioning structure is introduced as an intermediary element between the contact image sensor and the original table. This intermediary absorbs shocks and maintains a constant gap under normal conditions, but can compress or deform when external forces are applied, protecting the sensor from shock damage while maintaining the required gap for precise imaging.
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 effectively absorbs shocks and prevents damage to the image sensor by allowing it to separate from the original table during external forces, maintaining a consistent gap and ensuring high accuracy in image reading.
Implementation Method 1
a pressing unit (57) that is disposed between the image sensor (50) and the holder (51) and presses the image sensor (50) toward the rear surface (75) of the original table (35)
Implementation Method 2
a pulling unit (63) that is disposed between the image sensor (50) and the holder (51) and pulls a center portion in the one direction of the image sensor (50) toward the holder (51)
Data Source
AI summary
An image reading device has a CIS unit. The CIS unit is held by a carriage. A compression coil spring that presses the CIS unit toward a contact glass plate is disposed between the bottom surface of the carriage and the bottom surface of the CIS unit. An extension coil spring that pulls the CIS unit toward the carriage is attached between the bottom surface of the carriage and the center portion of the CIS unit.