Camera Module Lens Binding via Threaded Groove Adhesive
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Solution Overview
Problem
The existing camera module designs face challenges in ensuring precise optical axis alignment and sufficient adhesive binding force between the lens and voice coil motor, leading to poor focusing and issues like 'black shadows' and 'black spots' in images, especially with emerging technologies like wide aperture and optical image stabilization.
Innovation Solution
A camera module design featuring a screw thread structure recessed within the voice coil motor and a corresponding groove on the lens, filled with adhesive, which enhances the binding force between the lens and voice coil motor, improving focusing precision and reducing module size by utilizing adhesive overflow grooves for increased adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a screw-in structure is used to bind the lens and voice coil motor, then the binding force is sufficient, but the module size becomes excessively large and optical axis alignment precision deteriorates
Solution Approach 1:
The patent divides the binding interface into two distinct zones: a first portion for adhesive binding and a second portion with screw thread structures for mechanical interlocking. This segmentation allows each zone to perform its specialized function optimally, combining the benefits of both adhesive bonding and mechanical fastening while reducing overall module size compared to traditional screw-in structures.
Solution Approach 2:
Different portions of the binding interface have different structural qualities: the first portion has a smooth surface optimized for adhesive contact, while the second portion has screw thread structures optimized for mechanical interlocking. This local differentiation of structural properties allows the system to achieve both strong binding and compact dimensions.
2Volume of moving object
If a screw-free smooth surface structure is used to reduce module size, then the module size is reduced, but the adhesive binding force becomes insufficient leading to poor focusing
Solution Approach 1:
The binding interface is segmented into two functional zones: a first smooth portion for adhesive application and a second portion with screw thread structures. This segmentation allows the smooth surface to provide adequate adhesive bonding area while the screw thread structures provide additional mechanical interlocking to ensure sufficient overall binding force.
Solution Approach 2:
The binding system uses a composite approach combining adhesive material with mechanical screw thread structures. This composite solution provides both chemical bonding through the adhesive and mechanical interlocking through the screw threads, ensuring sufficient binding force in a compact design.
3Strength
If a screw-in structure is used, then binding force is provided, but optical axis alignment precision deteriorates making it hard to reduce black shadows and black spots
Solution Approach 1:
By separating the binding function into two zones (adhesive portion and screw thread portion), the patent allows the optical components to be positioned precisely in the first portion without the interference of screw threads, while the second portion provides the necessary mechanical fastening away from the optical path.
Solution Approach 2:
The screw thread structures are extracted and relocated to a second portion of the binding interface that is separate from the primary optical mounting area. This extraction removes the source of alignment errors from the critical optical mounting zone, improving optical axis alignment precision.
4Volume of moving object
If adhesive is dispensed in a screw-free structure, then module size is reduced, but the adhesive binding force is insufficient for proper focusing
Solution Approach 1:
The patent segments the binding interface to include both an adhesive-friendly smooth surface portion and a mechanical interlocking portion with screw threads. This segmentation ensures that adhesive can be effectively applied in the first portion while the second portion provides additional mechanical support for reliable focusing performance.
Solution Approach 2:
The binding system combines adhesive bonding with mechanical screw thread interlocking in a composite structure. This composite approach ensures sufficient binding force and reliable focusing performance while maintaining a compact module size, overcoming the limitations of purely adhesive-based solutions.
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 design effectively increases the adhesive binding force between the lens and voice coil motor, improving focusing precision and reducing the occurrence of 'black shadows' and 'black spots' while maintaining a compact module size, thus addressing the limitations of both screw-in and screw-free structures.
Implementation Method 1
the groove portion is filled with adhesive
Data Source
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AI summary
Embodiments of this application provide a camera module and a terminal, to resolve a problem of poor focusing of a module due to an insufficient adhesive binding force between a lens and a voice coil motor. The camera module includes a lens and a voice coil motor, and the lens is placed in the voice coil motor, where a first portion of an inner side of the voice coil motor is attached to a first portion of an outer side of the lens, and a second portion of the inner side of the voice coil motor is provided with a screw thread structure recessed relative to the first portion of the inner side of the voice coil motor, the screw thread structure and a second portion of the outer side of the lens form a groove portion, and the groove portion is filled with adhesive. The first portion of the inner side of the voice coil motor is a lower portion of the inner side of the voice coil motor, and the second portion of the inner side of the voice coil motor is an upper portion of the inner side of the voice coil motor. The first portion of the outer side of the lens is a lower portion of the outer side of the lens, and the second portion of the outer side of the lens is an upper portion of the outer side of the lens. The embodiments of this application are applicable to fastening a voice coil motor and a lens together.