Lens Module Barrel Matching Structure for Assembly Precision
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Solution Overview
Problem
Existing lens modules face challenges in ensuring the precision of the outer diameter of glass lenses, leading to unstable assembly due to light-blocking sheet deflection and significant force transmission during assembly, resulting in low assembly yield and precision.
Innovation Solution
The lens module incorporates a matching structure between the first glass lens and the lens barrel, featuring a concave-convex design for the first lens's peripheral portion to ensure edge thickness and prevent light-blocking member deflection, with a light-blocking member positioned between lenses to stabilize assembly forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a glass lens is used with a normal matching structure, then the lens can be assembled with the lens barrel, but the outer diameter precision cannot be guaranteed and assembly yield is low
Solution Approach 1:
The patent applies local quality by creating a matching structure specifically on the peripheral portion of the glass lens that interfaces with the lens barrel. This localized matching structure ensures precise outer diameter fit without requiring the entire lens to be processed, thereby maintaining manufacturing precision while improving assembly yield.
Solution Approach 2:
The patent introduces a matching structure as an intermediary element between the glass lens and the lens barrel. This matching structure acts as a mediator that facilitates precise assembly by providing a dedicated interface region, thereby improving both outer diameter precision and assembly yield without compromising the optical properties of the lens.
2Strength
If the edge thickness is guaranteed with a matching structure, then the lens structure is strengthened, but the light-blocking sheet becomes deflected and assembly stability decreases
Solution Approach 1:
The patent segments the lens structure into an optical portion and a peripheral portion, with the matching structure located exclusively on the peripheral portion. This segmentation allows the edge thickness to be strengthened for structural integrity while isolating the matching structure's impact to a specific region, preventing light-blocking sheet deflection and maintaining assembly stability.
Solution Approach 2:
The matching structure is applied locally to the peripheral portion of the lens rather than uniformly across the entire lens. This localized approach strengthens the edge thickness where needed while minimizing interference with the light-blocking sheet and other optical components, thereby maintaining assembly stability.
3Ease of manufacture
If a matching angle larger than 45° is used for glass processing, then the glass can be processed, but the light-blocking sheet is easily deflected and assembly yield is low
Solution Approach 1:
The patent applies the matching structure locally to the peripheral portion of the lens, allowing glass processing with angles larger than 45° only where structurally necessary. This localized processing approach enables ease of manufacture for the peripheral portion while preventing light-blocking sheet deflection in the optical regions, thereby improving assembly yield.
Data Source
AI summary
A lens module is provided, including: a lens barrel including first and second barrel walls; and a set of lenses received in the lens barrel and including at least a first lens and a second lens arranged from an object side to an image side. The first lens includes a first optical portion and a first peripheral portion surrounding the first optical portion. A surface of the first barrel wall close to the image side includes a first planar surface extending horizontally towards an optical axis from a position where the first barrel wall is connected to the second barrel wall; a first oblique surface extending obliquely from the first planar surface towards the optical axis and towards the image side; and a second planar surface extending horizontally from the first oblique surface towards the optical axis.