Dual-Adhesive Optical Part Fixing for Image Reading Device Assembly
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Solution Overview
Problem
The existing image reading devices face challenges in efficient assembly due to the long hardening time of silicone resin adhesives, which requires holding the device still and hinders faster assembly, and non-uniform illumination if the linear light source or lens array is not accurately positioned.
Innovation Solution
The use of a two-adhesive system where a first adhesive with a shorter hardening time, such as ultraviolet curable resin, is applied to fix the optical parts initially, allowing for quicker assembly, while a second adhesive with a longer hardening time, like silicone or epoxy resin, provides stable bonding without the need to wait for complete hardening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone resin is used as adhesive to fix the linear light source and lens array, then stable bonding is achieved, but the hardening time becomes excessively long
Solution Approach 1:
The adhesive system is segmented into two distinct components: a first adhesive (silicone resin) applied to the light source accommodating portion and a second adhesive (epoxy resin or similar) applied to the lens array. This segmentation allows each adhesive to perform its specialized function independently, with the second adhesive providing rapid initial fixation and the first adhesive providing long-term stable bonding.
Solution Approach 2:
The second adhesive with fast hardening properties is applied preliminarily to enable immediate assembly and positioning of the lens array. This preliminary action allows the device to be assembled quickly without waiting for the slow-hardening first adhesive to set, while the first adhesive continues to provide stable bonding as it gradually hardens.
2Ease of manufacture
If the linear light source is installed in an inclined state, then assembly becomes easier, but the original manuscript illumination becomes non-uniform
Solution Approach 1:
The adhesive composition parameters are changed by using a dual-adhesive system where the second adhesive (fast-hardening epoxy or similar) enables the light source to be installed at any angle without compromising final positioning. The rapid initial set allows for angle adjustment, while the first adhesive ensures stable bonding in the final desired orientation, decoupling assembly ease from positioning precision.
3Ease of manufacture
If the lens array position deviates in the lens accommodating portion, then assembly becomes simpler, but light reception by the light receiving element is impaired
Solution Approach 1:
The positioning and bonding functions are segmented between two adhesives: the second adhesive enables simple assembly with minimal positioning concern due to its fast hardening, while the first adhesive ensures precise final positioning and stable bonding. This segmentation allows assembly personnel to focus on rough positioning without worrying about precision, as the adhesive system compensates and secures the final arrangement.
4Reliability
If the device is held still for a long time during assembly, then adhesive bonding quality is improved, but assembly efficiency is reduced
Solution Approach 1:
The second adhesive performs a preliminary bonding action that is sufficient for immediate assembly and functional testing. This preliminary action eliminates the need to hold the device still for extended periods, as the fast-hardening adhesive provides adequate initial bonding strength. The first adhesive continues to develop its bonding strength in the background, ensuring long-term reliability without impacting assembly efficiency.
Solution Approach 2:
The bonding process continues usefully without interruption: the second adhesive provides immediate bonding capability that allows assembly to proceed continuously, while the first adhesive simultaneously continues to harden and provide enhanced bonding strength. This continuity eliminates idle waiting time while ensuring progressive bonding quality improvement.
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 approach reduces the manufacturing time by allowing assembly without waiting for the second adhesive to fully harden, improving manufacturing efficiency and ensuring stable attachment of the linear light source and lens array even in adverse environments.
Implementation Method 1
a first adhesive with a shorter hardening time, such as ultraviolet curable resin
Implementation Method 2
The optical part is fixed in the accommodating portion through a first adhesive and a second adhesive
Data Source
AI summary
An image reading device and a method for manufacturing the same are provided, where the image reading device is capable of being assembled more efficiently. The image reading device includes: an optical part, extending long in a direction; a case, having an accommodating portion for accommodating the optical part; and a light receiving component, accommodated in the case. The optical part is fixed in the accommodating portion through a first adhesive and a second adhesive with hardening time longer than that of the first adhesive.