Five-Lens Camera Assembly for Compact Size and Wide Field Angle
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Solution Overview
Problem
Conventional camera lens assemblies face challenges in miniaturization and improving imaging quality to match the reduced size and advancements of semiconductor-based photosensitive elements, while also maintaining effective focal lengths and reducing chromatic aberration.
Innovation Solution
A camera lens assembly comprising five lenses with specific focal powers and surface curvatures, including a positive and negative focal power arrangement, an aperture stop, and aspheric lens shapes, optimized by formulas to achieve compact size, enlarged field angle, and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is miniaturized to match reduced-size photosensitive elements, then the device size is reduced, but the imaging quality deteriorates
Solution Approach 1:
The lens assembly is divided into five separate lens elements (first through fifth lenses) with alternating positive and negative focal powers. This segmentation allows each lens to contribute specifically to correcting optical aberrations while maintaining a compact overall structure, thereby preserving imaging quality in the miniaturized design.
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first lens has a convex object-side surface and concave image-side surface, the third lens has negative focal power, the fourth lens has a convex image-side surface, and the fifth lens includes inflection points on its surfaces. These localized optical characteristics enable effective correction of chromatic and spherical aberrations within the compact form factor.
2Length of moving object
If the focal lengths are optimized for compact design, then the lens assembly length is reduced, but the field angle decreases
Solution Approach 1:
The optical design employs dynamic optimization of the focal lengths and spacing between lens elements to achieve a balance between compact length and enlarged field angle. The alternating positive and negative focal power arrangement allows the system to dynamically adjust light paths to capture wider fields while maintaining short overall length.
Solution Approach 2:
The fifth lens is designed with inflection points on its object-side and/or image-side surfaces, introducing complex surface geometry that enables wider field coverage without increasing the axial length of the lens assembly. This dimensional complexity in surface shaping allows field angle expansion within compact constraints.
3Ease of manufacture
If the lens configuration is simplified for cost reduction, then the manufacturing cost decreases, but the chromatic aberration increases
Solution Approach 1:
The design optimizes specific parameter relationships between lens elements to control chromatic aberration: the ratio of effective focal lengths (f/f3 between -0.7 and -0.3), the abbe coefficient difference (V1-V3 > 30 between first and third lenses), and curvature radius ratios (R6/R7 between 0.05 and 2.0 for third and fourth lenses). These parameter constraints enable chromatic aberration correction using standard manufacturing processes without requiring exotic materials or complex assemblies.
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 solution effectively shortens the lens assembly length, enhances imaging quality, reduces chromatic aberration, and increases the field angle, while maintaining a compact and cost-effective design.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side of the camera lens assembly to an image side of the camera lens assembly in turn, wherein the first lens is of a positive focal power... the third lens is of a negative focal power... the fourth lens is of a positive focal power... the fifth lens is of a negative focal power
Implementation Method 2
an aperture stop arranged between a subject and the second lens
Data Source
AI summary
Provided is a camera lens assembly, including a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side of the camera lens assembly to an image side of the camera lens assembly in turn. The first lens is of a positive focal power, an object side surface of the first lens is convex and an image side surface of the first is concave; the second lens is of a focal power; the third lens is of a negative focal power; the fourth lens is of a positive focal power, an image side surface of the fourth lens is convex; the fifth lens is of a negative focal power, and at least one inflection point is present in at least one of object and image side surfaces of the fifth lens. The camera lens assembly meets the following formulas: TTL/2Y≤0.7; and −0.7<f/f3<−0.3.