Wide-Angle Camera Lens Using Composite Plastic-Glass Elements
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Solution Overview
Problem
Current ultra-wide-angle camera lenses face challenges in achieving miniaturization, high imaging quality, and low weight while maintaining a large field angle and high relative illumination, as traditional all-glass structures limit further reduction in overall length and field angle expansion.
Innovation Solution
A wide-angle camera lens design incorporating multiple aspheric surfaces with specific refractive powers and curvature radii, including a combination of glass and plastic materials, to optimize focal lengths, curvature ratios, and thickness distributions, ensuring high definition and relative illumination while reducing chromatic aberration and off-axis aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an all-glass structure is used, then imaging quality is maintained, but the overall length cannot be reduced further
Solution Approach 1:
The patent employs a composite optical structure combining plastic optical lenses and glass optical lenses. Specifically, lenses 1-4 are made of plastic material while lenses 5-7 are made of glass material. This composite approach allows the system to achieve miniaturization (reducing overall length) while maintaining imaging quality through the synergistic combination of different material properties - plastic for weight reduction and compactness, glass for optical performance.
Solution Approach 2:
The patent utilizes aspheric surfaces with specific conic coefficients (k1, k2, k3 values provided in the table) to optimize optical performance. By changing the surface geometry parameters from standard spherical to aspheric forms, the system achieves better aberration correction and imaging quality within a compact structure, enabling miniaturization without sacrificing optical performance.
2Area of stationary object
If the field angle is increased, then more information is obtained, but the lens size increases
Solution Approach 1:
The patent employs aspheric surfaces with specific conic coefficients to design the lens curvature. The aspheric surfaces (with k1, k2, k3 values provided) enable the lens to achieve a wide field angle while maintaining a compact structure. The optimized curvature radii and aspheric coefficients allow light rays from wide angles to be properly focused without requiring increased lens volume.
Solution Approach 2:
The combination of plastic and glass materials with different refractive indices and optical properties enables the system to achieve a large field angle while keeping the overall lens size compact. The plastic lenses (1-4) contribute to weight reduction and compactness, while glass lenses (5-7) provide the necessary optical performance for wide-angle imaging.
3Length of moving object
If the refractive power is increased, then the focal length is reduced, but chromatic aberration increases
Solution Approach 1:
The patent uses a composite optical structure with plastic lenses (1-4) and glass lenses (5-7) having different refractive indices and dispersion characteristics. This material combination allows for effective chromatic aberration correction while achieving short focal length. The different optical properties of plastic and glass materials work together to balance focal length reduction with aberration control.
Solution Approach 2:
Different regions of the optical system use different materials and surface properties optimized for their specific functions. The plastic lenses provide weight reduction and compactness, while glass lenses provide superior optical performance and aberration correction. This localized optimization of material properties allows the system to achieve short focal length without excessive chromatic aberration.
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 effectively increases the field angle, achieves high definition and relative illumination, and reduces the overall length of the lens, addressing the need for miniaturization and improved imaging quality.
Implementation Method 1
a first optical lens with negative refractive power; a second lens with refractive power; a third lens with negative refractive power...
Data Source
AI summary
The present invention provides a wide-angle camera lens consisting of seven lens elements. The wide-angle camera lens successively includes: a first optical lens with negative refractive power; a second optical lens with negative refractive power; a third optical lens with negative refractive power, an image side surface of the third optical lens being a convex surface; a fourth optical lens with refractive power; a fifth optical lens with refractive power; a sixth optical lens with refractive power; and a seventh optical lens with refractive power from an object side to an image side, wherein −5.5<f1/f<−2; −2.5<f5/f6<−0.5; f1 is an effective focal length of the first optical lens, f is an effective focal length of the wide-angle camera lens, f5 is an effective focal length of the fifth optical lens, and f6 is an effective focal length of the sixth optical lens.