Optical Lens Module Head Size Reduction via Protruding Plastic Lens
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Solution Overview
Problem
Conventional optical lens modules are limited by the size of the lens and the wall thickness of the lens barrel, hindering miniaturization efforts in electronic products like mobile phones and tablets.
Innovation Solution
The optical lens module design includes a lens barrel with a first plastic lens that protrudes from the object side end surface, featuring an imaging portion and a fixing portion, and a press ring that abuts against the second lens, allowing the first lens to extend outside the barrel and reducing the head size by not being constrained by the barrel's wall thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lens barrel wall thickness is increased to support the lens structure, then the structural strength is improved, but the head size of the optical lens module increases
Solution Approach 1:
The first lens is designed with a protruding imaging portion that extends beyond the object side end surface of the lens barrel in the optical axis direction. This dimensional change allows the optical function to be achieved outside the traditional barrel boundary, decoupling the head size from the barrel wall thickness and enabling miniaturization of the overall module while maintaining structural integrity.
Solution Approach 2:
The first lens is divided into two functional portions: an imaging portion that protrudes from the lens barrel to perform optical functions, and a fixing portion that remains within the lens barrel for structural support and mounting. This segmentation allows the optical functionality to be separated from the structural constraints, enabling the head size to be determined by the imaging portion rather than the entire lens including thick barrel walls.
2Length of moving object
If the lens protrudes from the lens barrel, then the head size is reduced, but the alignment precision and mounting stability deteriorate
Solution Approach 1:
The first lens is segmented into a protruding imaging portion and an internal fixing portion. The fixing portion remains within the lens barrel where it can be precisely positioned and secured using conventional mounting techniques (adhesive, mechanical retention), ensuring alignment precision. The imaging portion extends outward to reduce head size without compromising the stability of the mounted lens, as the fixing portion provides a secure anchor point within the barrel.
Data Source
AI summary
Provided is an optical lens module including a lens barrel, a lens assembly and a press ring, the lens barrel has an object side end surface, the lens assembly includes a first lens and a second lens, the first lens is a plastic lens including an imaging portion and a fixing portion around the imaging portion, the imaging portion extends towards and beyond an object side, the second lens is located in the lens barrel. The press ring includes an inner side surface and an outer side surface, the inner side surface is fixed with the fixing portion, the outer side surface is connected with the lens barrel, the press ring abuts against an object side surface of the second lens. In this optical lens module, head size of the optical lens module is no longer limited by wall thickness of the lens barrel, thereby greatly reducing head size.