Lens Module Adhesive Groove Design for Back Focal Length
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Solution Overview
Problem
The pressing ring in existing lens modules limits the height and back focal length of the lens, restricting the miniaturization and overall length of the module.
Innovation Solution
A lens module design where the first lens is fixedly connected to the image side surface of the spacing ring and the second barrel wall, eliminating the need for a pressing ring, with a jagged adhesive groove increasing the adhesive area for enhanced stability and reliability, and using shadowless adhesive cured by ultraviolet light for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressing ring is used to fix the first lens, then the lens can be securely fixed, but the height and back focal length of the lens are limited
Solution Approach 1:
The pressing ring is removed from the lens module structure. Instead of using a pressing ring to secure the first lens, the patent directly adheres the first lens to the bottom wall of the lens barrel through adhesive, eliminating the space-consuming pressing ring component and thereby increasing the back focal length while maintaining fixing stability.
Solution Approach 2:
The mechanical pressing and fixing mechanism (pressing ring) is replaced with a chemical bonding mechanism (adhesive). The adhesive groove with jagged edges provides enhanced adhesion strength, allowing the first lens to be securely fixed without the mechanical constraint of a pressing ring, thus resolving the contradiction between fixing stability and back focal length.
2Reliability
If a pressing ring is used to fix the first lens, then the lens can be securely fixed, but the overall length of the lens module increases
Solution Approach 1:
The pressing ring is extracted from the lens module assembly. By eliminating this component and directly adhering the first lens to the lens barrel bottom wall, the overall length of the lens module is reduced while maintaining secure fixing through the adhesive bonding mechanism.
3Length of moving object
If the first lens is directly adhered to the lens barrel, then the overall length is reduced, but the adhesive bonding strength must be sufficient
Solution Approach 1:
The adhesive groove is designed with jagged edges at the bonding interface between the first lens and the lens barrel bottom wall. This local structural feature increases the surface area and mechanical interlocking of the adhesive bonding region, thereby enhancing the adhesive bonding strength specifically at the critical joint without affecting the overall compact design.
Solution Approach 2:
The adhesive groove extends in the depth direction (along the optical axis) with jagged edges, transforming a simple surface bonding into a three-dimensional interlocking structure. This dimensional enhancement of the bonding interface significantly increases the adhesive bonding strength while maintaining the compact overall length of the lens module.
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 allows for a smaller contour dimension, reduced overall length, and increased mechanical back focal length, while improving the stability and reliability of the lens module by direct adhesion to the barrel and optimized adhesive distribution.
Implementation Method 1
ultraviolet light passes through the first lens to cure the shadowless adhesive
Data Source
AI summary
Provided is a lens module, including a lens barrel, a first lens and a spacing ring. The lens barrel includes a first barrel wall hole and a second barrel wall extending from the first barrel wall while being bent. The first lens includes a bearing portion. The spacing ring abuts against an inner wall of the second barrel wall. The bearing portion of the first lens is fixedly connected to an image side surface of the spacing ring and an image side surface of the second barrel wall. An adhesive groove is formed at a position where the first lens is connected to the spacing ring and the second barrel wall. The lens module according to the present invention is stable and reliable, and has a smaller contour dimension, a smaller overall length, and an increased mechanical back focal length.