UV-Cured Camera Module Assembly for Focus Accuracy
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Solution Overview
Problem
Existing camera modules face issues with lens focus deviation due to thermal shrinkage of thermosetting adhesives used in the assembly process, which affects the performance of the imaging apparatus.
Innovation Solution
The camera module employs a UV-curable resin as a joining member that cures without thermal processing, ensuring that the positional relationship between the lens holder and camera substrate is not affected by cure shrinkage, thereby maintaining focus accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermosetting adhesive is used to join lens barrel to semiconductor chip, then strong bonding strength is achieved, but thermal shrinkage during curing causes lens focus deviation
Solution Approach 1:
The patent changes the curing mechanism parameter from thermal (heat-based) to photopolymerization (UV light-based). The adhesive composition is modified to contain photopolymerization initiators that activate under UV irradiation, eliminating the thermal shrinkage issue while maintaining strong bonding. This parameter change in the curing process resolves the contradiction between bonding strength and focus accuracy.
Solution Approach 2:
The adhesive used is a composite material containing both thermosetting resin components and photopolymerization initiators. This composite formulation allows the adhesive to cure via UV irradiation rather than thermal heating, thereby achieving strong bonding without the thermal shrinkage that causes lens focus deviation. The composite nature of the adhesive enables dual functionality: strong adhesion and UV-curable properties.
2Ease of manufacture
If thermal heating is applied to cure adhesive, then bonding is achieved, but thermal deformation affects lens position and focus
Solution Approach 1:
The patent replaces the thermal curing mechanism with a photopolymerization mechanism. Instead of using heat (thermal energy) to cure the adhesive, UV light (electromagnetic energy) is used to initiate photopolymerization. This substitution eliminates thermal deformation and protects the lens position and focus accuracy while maintaining ease of manufacture through UV irradiation curing.
Solution Approach 2:
The curing process parameter is changed from temperature-based (thermal) to light-based (photopolymerization). The adhesive is formulated with photopolymerization initiators that activate under UV irradiation, allowing curing to occur without thermal heating. This parameter change resolves the contradiction between ease of manufacture and manufacturing precision by enabling curing without thermal deformation.
3Manufacturing precision
If focus-positioning bosses are melted by heating, then lens positioning is achieved, but thermal processing complicates the manufacturing process
Solution Approach 1:
The patent replaces thermal melting of focus-positioning bosses with UV-cured adhesive bonding. Instead of heating the thermoplastic lens barrel to melt the bosses for positioning, the adhesive is cured via UV irradiation to achieve precise lens positioning. This substitution simplifies the manufacturing process by eliminating the need for thermal processing while maintaining positioning accuracy.
Solution Approach 2:
The adhesive is applied to the focus-positioning bosses before UV irradiation curing. This preliminary action allows the adhesive to be in place and ready for curing, which then locks the lens in the correct position. The UV curing process is simpler and faster than thermal melting, reducing manufacturing process complexity while achieving the same positioning function.
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 effectively suppresses lens focus deviation, enhances manufacturing flexibility, and maintains performance by eliminating thermal deformation issues associated with traditional adhesives.
Implementation Method 1
The joining member is formed of a UV-curable resin
Data Source
AI summary
A camera module includes at least one lens, a camera substrate, a lens holder and a joining member. The lens holder is formed of a material not transparent to visible light, and has a lens-holding part and a base part. The lens-holding part is formed in a tubular shape and holds the at least one lens therein. The base part is also formed in a tubular shape and located closer to the camera substrate than the lens-holding part is in an optical axis direction. The joining member is formed of a UV-curable resin, and provided at a location where the camera substrate is joined to the base part of the lens holder or at a location where the lens-holding part and the base part of the lens holder are joined to each other. At least a facing portion of the lens holder, which faces the joining member, has UV transparency.