Contact Image Sensor Positioning via Elastic Urging
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Solution Overview
Problem
In image scanners with contact image sensors, manufacturing errors and differences in shaft diameters and hole sizes, as well as cutout and protrusion lengths, can cause the image sensor to be inaccurately positioned, leading to misalignment and poor image reading quality.
Innovation Solution
An image reading unit is designed with a contact image sensor module that includes a shaft and a protrusion, along with a holder and an urging member, to ensure accurate positioning by using an insertion section for the shaft and a contact section for the protrusion, maintaining the sensor in a precise location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image sensor is placed in the housing using shafts and rotational holes, then the image sensor can be positioned in the predetermined position, but manufacturing errors cause the image sensor to move in the holder
Solution Approach 1:
The urging member applies a dynamic force to continuously press the contact section against the contact surface, creating a self-adjusting mechanism that compensates for manufacturing variations and maintains stable positioning despite dimensional differences in shafts and holes
Solution Approach 2:
The design allows for parameter variations in shaft diameter and hole size by introducing an urging force that adapts the contact pressure, enabling the positioning mechanism to function reliably across a range of dimensional tolerances rather than requiring precise parameter matching
2Ease of operation
If shafts and rotational holes are used for positioning, then the image sensor can be located along the longitudinal direction, but differences in dimensions cause misalignment
Solution Approach 1:
The urging member acts as an intermediary element between the positioning structure and the image sensor, transmitting a pressing force that ensures accurate alignment while allowing the simple shaft-and-hole assembly method to remain in place
Solution Approach 2:
The urging member pre-applies a positioning force before the final assembly is complete, counteracting potential misalignment caused by dimensional variations in the shafts and rotational holes during the assembly process
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 configuration ensures the contact image sensor module is accurately placed, enhancing image reading precision and reliability by compensating for manufacturing errors and ensuring consistent alignment.
Implementation Method 1
a first urging member interposed between the contact image sensor module and the holder and configured to urge the contact image sensor module toward the one side in the first direction
Data Source
AI summary
An image reading apparatus including a contact image sensor module, a holder, and an urging member is provided. The contact image sensor module may extend in a first direction and include a shaft extending in the first direction and a protrusion protruding from the contact image sensor module in a second direction. The holder may accommodate the contact image sensor module and include an insertion section, in which a leading edge of the shaft is inserted, and a contact section contacting the protrusion from one side in the first direction. The first urging member may urge the contact image sensor module toward the one side in the first direction.