Open-Ring Lens Fixing Assembly for Stable Optical Positioning
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Solution Overview
Problem
Existing lens assembly methods using press-fit rings in camera modules face issues with adhesive flow affecting lens positioning and resolving power, and the press-fit ring's elastic force changing the fixed position during adhesive curing.
Innovation Solution
A lens assembly design incorporating a fixing member with an open ring shape or snap ring, accommodated in a groove of the lens barrel, and a fastening portion with tapered structures to securely fix the lens in place, using a press fit mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to fix the press-fit ring to the lens barrel, then the press-fit ring can be fixed to the lens barrel, but the adhesive flows into the empty space or optical surface affecting lens positioning and resolving power
Solution Approach 1:
The patent removes the adhesive from the system by designing a press-fit ring with an external diameter larger than the lens barrel's internal diameter, enabling mechanical interference fit without adhesive. This extraction of the adhesive eliminates the problem of adhesive flowing into empty spaces or optical surfaces, thereby maintaining lens positioning accuracy while achieving reliable fixation through elastic deformation and friction.
Solution Approach 2:
The patent changes the dimensional parameters by making the press-fit ring's external diameter larger than the lens barrel's internal diameter, creating an interference fit condition. This parameter change transforms the fixation mechanism from adhesive-based to mechanical force-based, where the press-fit ring elastically deforms to fit into the lens barrel, providing stable fixation without adhesive flow issues.
2Manufacturing precision
If the press-fit ring is assembled in a forced fitting manner to prevent adhesive flow, then adhesive flow is prevented, but the press-fit ring must be bent during assembly causing position changes during adhesive curing
Solution Approach 1:
The patent extracts the adhesive from the assembly process entirely, replacing it with a pure mechanical interference fit mechanism. The press-fit ring is designed with dimensions that create elastic deformation during assembly, eliminating the need for adhesive application and curing steps, thereby simplifying the assembly process while maintaining positioning accuracy.
Solution Approach 2:
The press-fit ring utilizes its own elastic properties to achieve self-fixation. During assembly, the ring elastically deforms to fit into the lens barrel, then maintains fixation through elastic recovery and friction, without requiring external adhesive or complex assembly tools. This self-service mechanism simplifies the overall assembly process.
3Ease of operation
If the press-fit ring external diameter is made smaller than lens barrel internal diameter to avoid forced fitting, then assembly is easier, but adhesive flows into empty space affecting fixed position
Solution Approach 1:
The patent inverts the traditional dimensional relationship by making the press-fit ring's external diameter larger than the lens barrel's internal diameter. This parameter change creates an interference fit that provides both easy assembly through elastic deformation and reliable fixation through friction and elastic recovery, eliminating the need for adhesive while maintaining both ease of operation and fixation stability.
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
Stable fixation of lenses in the lens barrel is achieved, reducing manufacturing complexity and costs while maintaining optical integrity.
Implementation Method 1
The fixing member may be configured to be accommodated in a groove of the lens barrel while being widened
Data Source
AI summary
A lens assembly includes: a lens barrel; a lens accommodated in the lens barrel; and a fixing member disposed on one side of the lens and configured fix the lens to the lens barrel. The fixing member has an open ring shape.