Contact Image Sensor Housing Guide Shaft Integration
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Solution Overview
Problem
Conventional image readers face challenges in achieving accurate orthogonality between the longitudinal direction of the contact image sensor and the axial direction of the guide shaft, leading to increased manufacturing costs and complexity due to the need for high precision in multiple attachment operations and a large number of parts.
Innovation Solution
A contact image sensor with a housing that directly engages the guide shaft, eliminating the need for a holder and reducing the number of parts, allowing for precise and orthogonal alignment through accurate attachment of the housing to the guide shaft, and incorporating a sliding member for smooth and stable movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a holder is used to attach the contact image sensor to the guide shaft, then the sensor can be mounted, but the structure becomes complex and manufacturing costs increase
Solution Approach 1:
The patent removes the holder component from the system by directly integrating the guide shaft attachment function into the sensor housing. The guide shaft is directly attached to the housing at the bearing position, eliminating the need for a separate holder and reducing both structural complexity and manufacturing cost.
Solution Approach 2:
The patent merges the holder function with the sensor housing by directly attaching the guide shaft to the housing. This consolidation integrates multiple functions into a single component, simplifying the overall structure and reducing the number of parts required.
2Manufacturing precision
If high precision attachment operations are performed for multiple parts, then accurate orthogonality is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent eliminates intermediate attachment operations by directly attaching the guide shaft to the housing. This removes the need for multiple precision attachment steps involving holders and intermediate components, reducing manufacturing complexity while maintaining orthogonality precision through direct attachment.
3Ease of manufacture
If a holder and multiple parts are used, then the sensor can be assembled, but the number of parts increases and assembly becomes complex
Solution Approach 1:
The patent removes the holder and other intermediate components from the assembly, reducing the total number of parts. The guide shaft is directly attached to the housing, eliminating the need for separate holding components and simplifying the assembly process.
Solution Approach 2:
The patent combines multiple functions into fewer components by directly integrating the guide shaft attachment into the housing structure. This merging reduces the number of discrete parts and simplifies assembly operations.
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 solution simplifies the structure, reduces manufacturing costs, and ensures accurate orthogonal alignment between the guide shaft and the contact image sensor, enhancing the precision and efficiency of image reading while maintaining the sensor's close contact with the glass plate.
Implementation Method 1
light emitted from a light source irradiates a document, and image reading is performed by the reflected light being received by a light receiving element
Data Source
AI summary
An image reader includes a casing, a contact glass plate, a contact image sensor, and a sliding mechanism; wherein the contact image sensor has a housing, a light source attached to the housing so as to face the contact glass plate, a plurality of light receiving elements attached to the housing so as to face the contact glass plate and aligned in parallel in a longitudinal direction of the housing, and a bearing formed integral to the housing at a position below a lower surface of the housing; and the sliding mechanism includes a guide shaft provided on the casing and extending in a short direction of the housing and inserted through the bearing, and an urging member elastically which urges the guide shaft toward the contact glass plate so that the housing is pressed against the contact glass plate.