Four-Element Plastic Camera Lens for Miniaturization and Chromatic Aberration Correction
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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 for handheld devices, as the pixel size of photosensitive devices shrinks and imaging quality requirements increase, while traditional lens structures are not adequately addressing these needs.
Innovation Solution
A four-piece camera optical lens design comprising a Fresnel lens and three aspheric surface lenses made of plastic, with specific refractive power and focal length configurations, along with an optical filter, to minimize system length and improve imaging quality, while using Abbe number differences to correct color aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens pieces is increased to improve imaging quality, then imaging quality is improved, but the system length increases and the lens becomes less suitable for miniaturized handheld devices
Solution Approach 1:
The patent employs a compact four-piece lens structure where lenses are arranged in a nested configuration with optimized spacing. The first through fourth lenses are positioned sequentially with controlled air gaps, creating a compact overall structure that achieves good imaging quality without excessive length. This nested arrangement allows multiple optical elements to work together while minimizing the total optical path length.
Solution Approach 2:
The patent utilizes aspheric surfaces on all four lenses with specifically optimized curvature parameters. The aspheric coefficients are carefully selected to correct optical aberrations while maintaining a compact form factor. By changing the surface parameters from traditional spherical to aspheric designs, the system achieves improved imaging quality without requiring additional lens elements that would increase length.
2Measurement precision
If the pixel size of photosensitive devices is reduced to improve resolution, then resolution is improved, but chromatic aberration becomes more difficult to correct
Solution Approach 1:
The patent employs lenses with different refractive indices and Abbe numbers arranged in a specific sequence. The first lens has a positive refractive power with a specific Abbe number, while subsequent lenses have different optical properties. This composite arrangement of optical materials with varying dispersion characteristics effectively corrects chromatic aberration across the visible spectrum, enabling high-resolution imaging with miniaturized pixel sensors.
Solution Approach 2:
The patent applies aspheric surfaces specifically to correct local optical aberrations. Each lens surface has tailored aspheric coefficients that address specific aberration types at different field positions. This localized correction approach effectively manages chromatic and monochromatic aberrations across the entire image field, maintaining high resolution even with reduced pixel sizes.
3Length of stationary object
If the lens structure is miniaturized to meet thin and small requirements, then compactness is improved, but optical performance and aberration correction deteriorate
Solution Approach 1:
The patent employs aspheric surfaces on all four lenses instead of traditional spherical surfaces. The aspheric profiles provide superior control over light ray paths, enabling effective correction of spherical aberration, coma, and other monochromatic aberrations within a compact form factor. The curved aspheric surfaces optimize focusing performance while maintaining a short overall lens length suitable for handheld devices.
Solution Approach 2:
The patent divides the optical system into four distinct lens pieces, each with specific optical powers and functions. This segmentation allows independent optimization of each lens element's parameters to correct different types of aberrations. The distributed optical power across four elements achieves better overall optical performance in a compact configuration compared to fewer, larger elements.
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 better imaging quality, miniaturization, and effective correction of chromatic aberration, making it suitable for high-pixel portable cameras with a total optical length of less than 3.6 mm and a high image height to total optical length ratio, ensuring improved performance and compactness.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, from the object side to the image side in sequence... the first lens L1 has a positive refractive power... the second lens L2 has a negative refractive power... the third lens L3 has a positive refractive power... the fourth lens L4 has a negative refractive power
Implementation Method 2
with specific refractive power and focal length configurations, along with an optical filter, to minimize system length and improve imaging quality, while using Abbe number differences to correct color aberration
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, a first lens, a second lens, a third lens, and a fourth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of plastic material, and the fourth lens is made of plastic material. The camera optical lens further satisfies specific conditions.