Six-Lens Optical Imaging Assembly with Aspheric Surfaces
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Solution Overview
Problem
Current optical imaging lens assemblies for portable electronic devices face challenges in reducing size while maintaining high-pixel imaging performance, leading to increased design complexity and poor sensitivity due to large lens thickness, which complicates processing and results in short back focus.
Innovation Solution
A six-piece optical imaging lens assembly is designed with specific refractive power configurations and surface shapes for each lens, including convex and concave surfaces, to achieve a compact structure that enhances image quality and manufacturing feasibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of lenses is reduced to decrease device size, then the optical imaging lens assembly size is reduced, but the design difficulty increases and imaging performance deteriorates
Solution Approach 1:
The patent applies aspheric coefficients to the lens surfaces to change the geometric parameters, enabling fewer lenses to achieve the same imaging performance. This parameter change allows the optical system to maintain high-pixel imaging quality while reducing the total number of lenses and overall assembly size
2Ease of manufacture
If the lens thickness is increased to improve manufacturing, then the lens assembly becomes easier to process, but the back focus shortens and sensitivity decreases
Solution Approach 1:
The patent optimizes the thickness parameters of each lens element and the spacing between lenses to achieve an optimal balance. By carefully controlling these dimensional parameters, the design maintains sufficient back focus for sensitivity while ensuring the lenses are thick enough for practical manufacturing and molding
3Length of stationary object
If the lens thickness is reduced to achieve compact structure, then the back focus increases and sensitivity improves, but the manufacturing difficulty increases
Solution Approach 1:
The patent uses aspheric surface parameters and lens thickness optimization to enable thinner lenses that are still manufacturable. The aspheric coefficients allow for reduced thickness while maintaining optical performance, and the specific parameter ranges provided ensure the lenses remain within practical molding capabilities
4Length of moving object
If the refractive power is increased to achieve telephoto characteristics, then the optical imaging lens assembly achieves compact telephoto function, but the aberration control becomes more difficult
Solution Approach 1:
The patent distributes the refractive power across multiple lens elements with specific focal lengths and uses aspheric coefficients to control aberrations. This parameter distribution strategy allows the compact telephoto function to be achieved while maintaining aberration control through the combined effect of multiple optimized 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 configuration achieves telephoto characteristics with high image quality, suitable for production and processing, by optimizing refractive power, surface shapes, and spaced intervals between lenses, reducing lens thickness and improving image quality.
Implementation Method 1
a first lens E1 having refractive power; a second lens E2 having refractive power with a convex object-side surface and a concave image-side surface; a third lens E3 having refractive power; a fourth lens E4 having negative refractive power; a fifth lens E5 having negative refractive power with a concave object-side surface and a convex image-side surface; and a sixth lens E6 having refractive power with a concave object-side surface and a convex image-side surface
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens having refractive power; a second lens having refractive power with a convex object-side surface and a concave image-side surface; a third lens having refractive power; a fourth lens having negative refractive power; a fifth lens having negative refractive power with a concave object-side surface and a convex image-side surface; and a sixth lens having refractive power with a concave object-side surface and a convex image-side surface. A distance TTL along the optical axis from an object-side surface of the first lens to an imaging plane of the optical imaging lens assembly and a total effective focal length f of the optical imaging lens assembly satisfy: TTL/f<1.