Six-Lens Optical Assembly With Spacers for Stable Miniaturization
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Solution Overview
Problem
The challenge lies in optimizing the structure of optical systems for miniaturization while ensuring assembly stability and reducing the sensitivity of lens gaps, particularly in portable electronic devices where lens deformation due to radial forces affects imaging quality.
Innovation Solution
The optical system incorporates a lens barrel with a lens group comprising six lenses of specific refractive powers and spacer elements, adhering to certain ratios and dimensions to enhance assembly stability and reduce sensitivity, including spacer elements between lenses to control thickness and curvature ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical system is miniaturized, then the size is reduced, but the assembly stability deteriorates due to lens deformation under radial force
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, third lens group with positive refractive power) separated by spacer elements. This segmentation allows each group to be optimized independently for stability while maintaining overall miniaturization.
Solution Approach 2:
Spacer elements are introduced as intermediary components between adjacent lens groups. These spacers maintain precise spacing, reduce radial force transmission, and prevent direct contact between lens surfaces, thereby improving assembly stability without increasing overall system size.
2Manufacturing precision
If the number of lenses is increased to improve imaging quality, then the refractive power is enhanced, but the sensitivity to lens gap deformation increases
Solution Approach 1:
Spacer elements serve as mediators between lens groups, maintaining consistent spacing and reducing the sensitivity of the lens gap to deformation. The spacers compensate for manufacturing tolerances and assembly variations, ensuring stable optical performance across the six-lens system.
Solution Approach 2:
The patent optimizes specific parameters including the refractive powers of individual lenses (first lens: +2.00 to +3.00, second lens: -1.00 to -2.00, third lens: +1.00 to +2.00) and the thickness ratios of spacer elements to achieve balanced optical performance while minimizing gap sensitivity.
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 configuration improves assembly stability, reduces lens gap sensitivity, and enhances imaging quality by minimizing deformation and stray light, thereby ensuring consistent lens performance.
Implementation Method 1
a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power
Data Source
AI summary
Disclosed is an optical system, including a lens barrel with an accommodating space, and a lens group and at least one spacer element accommodated in the lens barrel, wherein the lens group comprises a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power, which are arranged in sequence from an object side to an image side along an optical axis; wherein the number of lenses with refractive power in the lens group is six; a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a maximum thickness CP2 of the second spacer element satisfy: 1.36≤(CT2+CP2)/CT3≤1.71; an effective focal length f2 of the second lens, an interval EP12 between the first spacer element and the second spacer element, and an interval EP23 between the second spacer element and the third spacer element satisfy: 2.88≤f2/(EP12+EP23)≤4.15.