Five-Element Camera Lens for Compact High-Pixel Imaging
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Solution Overview
Problem
There is a growing demand for ultra-thin wide-angle camera lenses with excellent optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size and increasing imaging quality requirements are not adequately met by existing lens structures.
Innovation Solution
A five-piece camera optical lens design is proposed, comprising specific refractive power configurations and materials for each lens, including a plastic first lens, plastic second lens, glass third lens, plastic fourth lens, and plastic fifth lens, with aspherical surfaces and carefully controlled refractive indices and Abbe numbers to minimize chromatic aberration and field curvature, while maintaining miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a five-piece or more lens structure is adopted to improve imaging quality and correct chromatic aberration, then optical performance is improved, but device complexity and total optical length increase
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the refractive indices and Abbe numbers of each lens element. The first lens has refractive index 1.505-1.580 and Abbe number 50-60, the second lens has refractive index 1.60-1.70 and Abbe number 20-30, the third lens has refractive index 1.70-1.80 and Abbe number 30-40, the fourth lens has refractive index 1.50-1.60 and Abbe number 40-50, and the fifth lens has refractive index 1.45-1.55 and Abbe number 50-60. These specific parameter ranges enable effective chromatic aberration correction and high imaging quality while maintaining a compact five-piece structure.
Solution Approach 2:
The patent employs composite materials by combining different types of optical materials with distinct refractive properties. It uses both high-refractive index materials (lenses 2 and 3) and low-refractive index materials (lenses 1, 4, and 5) with complementary Abbe numbers. This composite approach allows the lens system to correct chromatic aberration across multiple wavelengths while maintaining a manageable structural complexity.
2Reliability
If lens elements are increased to five or more pieces to reduce chromatic aberration, then chromatic aberration correction is improved, but total optical length increases
Solution Approach 1:
The patent utilizes parameter changes by optimizing the refractive indices and Abbe numbers of each lens element to achieve effective chromatic aberration correction within a compact form factor. The specific parameter ranges selected for each lens element enable the system to correct chromatic aberration while maintaining a total optical length of less than 6.4mm.
Solution Approach 2:
The patent applies local quality by assigning different optical properties to different positions within the lens system. The second and third lenses use high-refractive index materials with lower Abbe numbers to provide strong chromatic correction in the middle of the optical path, while the first, fourth, and fifth lenses use lower-refractive index materials with higher Abbe numbers to control overall system power and reduce total length. This localized optimization of optical properties enables effective chromatic aberration correction without increasing total optical length.
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 design achieves high-performance imaging with reduced system length, improved optical performance, and suppressed color differences, making it suitable for high-pixel portable cameras with a total optical length of less than 6.4 mm.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 arranged from the object side to the image side
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order from an object side to an image side, an aperture, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The camera optical lens further satisfies specific conditions.