Lens Module Diffractive Optical Element Positioning Groove Fixation
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Solution Overview
Problem
Conventional lens modules with diffractive optical elements and lenses experience shifting or separation due to inadequate fixation methods, such as adhesive bonding between surfaces, which compromises the stability and alignment of these components.
Innovation Solution
The implementation of positioning elements with L-shaped or stepped cross-sections and adhesive coating within corresponding grooves on the diffractive optical element and lens surfaces, ensuring secure locking and enhanced bonding strength by matching groove shapes and curvatures, preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive bonding is used to fix the diffractive optical element to the lens, then the assembly process is simple, but the fixation stability is insufficient leading to shifting or separation
Solution Approach 1:
The positioning element is divided into a first positioning portion that fits into a groove on the diffractive optical element and a second positioning portion that fits into a groove on the lens. This segmentation creates a mechanical interlocking structure that supplements the adhesive bonding, preventing shifting and separation while maintaining assembly simplicity.
Solution Approach 2:
The positioning element is nested within grooves formed on the diffractive optical element and the lens. The first positioning portion is received in the first groove and the second positioning portion is received in the second groove, creating a nested structure that enhances fixation stability without complicating the assembly process.
2Device complexity
If conventional adhesive bonding is used, then the structure is simple, but the alignment precision deteriorates due to component shifting
Solution Approach 1:
The grooves are pre-formed on the diffractive optical element and the lens before assembly. The positioning elements are designed to fit into these pre-formed grooves, establishing precise alignment positions in advance. This preliminary action ensures accurate alignment while keeping the overall structure relatively simple.
3Ease of manufacture
If adhesive bonding alone is used, then the manufacturing process is straightforward, but the bonding strength is insufficient to prevent separation
Solution Approach 1:
The fixation system combines adhesive material with positioning elements that have mechanical interlocking features. The adhesive is applied to bond the positioning elements to the diffractive optical element and lens, while the positioning elements provide mechanical strength through their interlocking geometry. This composite approach enhances bonding strength while maintaining manufacturing straightforwardness.
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 solution provides a stable and secure fixation of the diffractive optical element to the lens, preventing shifting and separation, thereby ensuring precise alignment and improved optical performance.
Implementation Method 1
Each of the positioning elements further adheres to the diffractive optical element and the lens by an adhesive coated on a sidewall of one of the first positioning grooves and a sidewall of one of the second positioning grooves
Data Source
AI summary
A lens module includes a diffractive optical element, a lens, and a plurality of positioning elements, the diffractive optical element and the lens are matched and positively held together. First positioning grooves are defined in the diffractive optical element, and corresponding second positioning grooves are defined in the lens which is stacked on the diffractive optical element. Each positioning element is fixed in and entirely within a first positioning groove and a second positioning groove to fix and hold the diffractive optical element and the lens together.