Five-Lens Imaging System for Compact High-Resolution Optics
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Solution Overview
Problem
There is a demand for imaging lenses that can be miniaturized to fit thinner devices such as smartphones and tablets while maintaining high resolution and performance compatible with increasing pixel counts in imaging elements like CCDs and CMOS sensors.
Innovation Solution
A five-lens configuration imaging lens system is developed, comprising a first positive refractive power lens, a second negative refractive power lens, a third negative refractive power lens, a fourth meniscus-shaped positive refractive power lens, and a fifth meniscus-shaped negative refractive power lens, optimized with specific focal length and refractive power ratios to achieve a shorter total length and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a five lens configuration is used to achieve high resolution for increased pixel counts, then imaging performance is improved, but the total length of the lens system increases
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios between lenses (specifically f/f5 between -1.9 and -0.9) and controlling the air lens refractive power (f·P45 between -0.5 and -2.0). These parameter optimizations enable the five-lens system to achieve high resolution while reducing the total length compared to conventional designs.
Solution Approach 2:
The patent utilizes composite optical design by combining five different lens elements with alternating positive and negative refractive powers, along with an air lens formed between the fourth and fifth lenses. This composite structure allows for aberration correction and compact design, achieving both high resolution and shortened length.
2Measurement precision
If more lenses are added to improve imaging performance for higher pixel counts, then optical performance is improved, but device complexity increases
Solution Approach 1:
The patent reduces complexity through parameter optimization, specifically controlling the focal length ratio f/f5 and the air lens refractive power f·P45 within specific ranges. This allows the five-lens system to achieve high performance without requiring additional complex elements or adjustment mechanisms.
Solution Approach 2:
The air lens formed between the fourth and fifth lenses serves multiple functions: it contributes to aberration correction, influences the overall focal length, and helps compact the design. This multi-functional element reduces the need for separate correction plates or additional lens elements, thereby reducing overall system complexity.
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 configuration allows for a significant shortening of the lens system's total length while maintaining high resolution and correcting various aberrations, enabling high-performance imaging compatible with increased pixel counts in imaging elements.
Implementation Method 1
a first lens having a positive refractive power and a convex surface toward the object side; a second lens having a negative refractive power and a concave surface toward the image side; a third lens having a negative refractive power and a concave surface toward the object side; a fourth lens having a positive refractive power and is of a meniscus shape having a concave surface toward the object side; and a fifth lens having a negative refractive power and is of a meniscus shape having a convex surface toward the image side
Data Source
AI summary
An imaging lens is substantially constituted by five lenses, including: a first lens having a positive refractive power and a convex surface toward the object side; a second lens having a negative refractive power and a concave surface toward the image side; a third lens having a negative refractive power and a concave surface toward the object side; a fourth lens having a positive refractive power and is of a meniscus shape with a concave surface toward the object side; and a fifth lens having a negative refractive power and is of a meniscus shape having a convex surface toward the image side, provided in this order from the object side. The imaging lens satisfies a predetermined conditional formula.