Six-Lens Optical System Tolerance Sensitivity Reduction
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Solution Overview
Problem
Conventional ultra-small lens optical systems have high sensitivity, making them unsuitable for high-resolution performance and are sensitive to tolerance, which affects product performance reproducibility.
Innovation Solution
A small lens system consisting of six lenses is designed with preset refractive power and shape for each lens, including a stop at the first lens, reducing the refractive power of the first lens, and forming the second lens with opposite convex surfaces to minimize sensitivity to tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the first lens has high refractive power and is positioned close to the stop, then the lens system can be miniaturized, but the sensitivity to tolerance increases
Solution Approach 1:
The patent changes the refractive power parameters of the lenses, specifically setting the first lens to have low refractive power (P1 = -0.01 to 0.01 mm⁻¹) and the second lens to have high refractive power (P2 > 0.4 mm⁻¹), which is opposite to conventional designs. This parameter reversal reduces sensitivity to tolerance while maintaining miniaturization.
Solution Approach 2:
The patent segments the refractive power distribution among six lenses, with the second lens having opposite convex surfaces and high positive refractive power, the third lens having negative refractive power, and subsequent lenses with specific power distributions. This segmentation of optical functions reduces the burden on any single lens and lowers overall tolerance sensitivity.
2Length of moving object
If the second lens is positioned close to the first lens with negative refractive power, then the lens system achieves compact structure, but the sensitivity to tolerance increases
Solution Approach 1:
The patent inverts the conventional lens configuration by giving the second lens opposite convex surfaces with high positive refractive power (P2 > 0.4 mm⁻¹) instead of negative power, while the third lens takes on the negative refractive power role. This inversion reduces tolerance sensitivity while maintaining compact length.
Solution Approach 2:
The patent changes the refractive power parameters significantly, with the second lens having P2 > 0.4 mm⁻¹ and the third lens having negative refractive power (P3 < -0.1 mm⁻¹). These parameter changes redistribute the optical burden and reduce sensitivity to manufacturing tolerances.
3Device complexity
If the power is largely focused on the first lens and the second lens, then the lens system can be simplified, but the sensitivity to tolerance increases
Solution Approach 1:
The patent changes the refractive power distribution parameters across all six lenses, with specific ranges defined for each (P1 = -0.01 to 0.01 mm⁻¹, P2 > 0.4 mm⁻¹, P3 < -0.1 mm⁻¹, P4 = -0.1 to 0.1 mm⁻¹, P5 > 0.7 mm⁻¹, P6 = -1.0 to 0.1 mm⁻¹). This distributed parameter approach simplifies the system while reducing tolerance sensitivity.
Solution Approach 2:
The patent segments the total refractive power across six lenses rather than concentrating it in one or two lenses. Each lens has a specific power range, creating a distributed system that is both simple in configuration and robust against tolerance variations.
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
The designed small lens system achieves reduced sensitivity to tolerance, improving product performance reproducibility and enabling high-performance capabilities suitable for small camera modules, such as smartphones.
Implementation Method 1
refractive power P1 of the first lens may satisfy −0.01 mm−1−1, the second lens may be shaped with opposite convex surfaces, and refractive power P2 of the second lens may satisfy P2>0.4 mm−1
Data Source
AI summary
A small lens system for developing a close tolerance is proposed. The small lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens that are arranged in order along an optical axis from an object. Refractive power P1 of the first lens satisfies −0.01 mm−1<P1<0.01 mm−1, the second lens is shaped with opposite convex surfaces, and refractive power P2 of the second lens satisfies P2>0.4 mm−1, the third lens has negative refractive power, and a rear surface curvature C6 of the third lens satisfies −0.01 mm−1<C6<0.01 mm−1, refractive power P4 of the fourth lens satisfies −0.1 mm−1<P4<0.1 mm−1, refractive power P5 of the fifth lens satisfies P5>0.7 mm−1, and refractive power P6 of the sixth lens satisfies P6<−0.7 mm−1.