Eight-Lens Optical Imaging Assembly for Large Imaging Plane
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Solution Overview
Problem
The challenge is to create an optical imaging lens assembly for portable electronic devices that achieves high imaging quality with a large imaging plane while being thin and light, as increasing pixel count and lens elements leads to increased optical length, contradicting the trend of thinner and lighter devices.
Innovation Solution
The optical imaging lens assembly consists of eight lenses with specific refractive powers and surface shapes, optimizing the total effective focal length, field-of-view, and lens thickness ratios to achieve an ultra-large imaging plane while maintaining a compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of lenses in the lens assembly is increased to improve imaging quality and increase the imaging plane size, then the imaging quality and imaging plane area are improved, but the total optical length of the lens assembly increases
Solution Approach 1:
The lens assembly is divided into eight individual lens elements (first lens through eighth lens) with specific refractive power configurations. Each lens element contributes to the overall imaging function while allowing the system to achieve a large imaging plane without proportionally increasing the total optical length. The segmentation of the optical system into multiple discrete elements enables optimized light path control.
Solution Approach 2:
The patent employs specific parameter relationships between the lenses, including refractive power ratios (e.g., the third lens has negative refractive power while others have positive refractive power), radius of curvature relationships, and thickness ratios. These parameter optimizations allow the lens assembly to achieve a large imaging plane area while controlling the total optical length by manipulating focal lengths, curvatures, and spacing between elements.
2Measurement precision
If the number of lenses in the lens assembly is increased to improve imaging quality, then the imaging quality is improved, but the size and weight of the lens assembly increase
Solution Approach 1:
The optical system is segmented into eight lens elements with alternating positive and negative refractive powers. This segmentation allows for compact arrangement where each element contributes to image quality correction and formation, achieving high imaging quality without requiring excessive space. The divided structure enables better control over aberrations while maintaining a compact form factor suitable for portable devices.
Solution Approach 2:
Specific parameter relationships are established among the lens elements, including refractive power ratios, radius of curvature relationships, and thickness ratios. These parameter optimizations enable the lens assembly to achieve high imaging quality with controlled size by precisely tuning the optical properties of each element and their relative positions.
3Area of stationary object
If the total effective focal length is increased to achieve a large imaging plane, then the imaging plane size is increased, but the lens assembly becomes longer
Solution Approach 1:
The patent establishes specific parameter relationships including the ratio between the total effective focal length and the focal length of individual lenses, as well as relationships between focal length and lens spacing. By optimizing these parameters, the system achieves a large imaging plane area through increased effective focal length while controlling the physical length through compact lens element spacing and configuration.
Solution Approach 2:
The lens assembly utilizes variations in lens element spacing and curvature in addition to focal length adjustments. By manipulating the spatial arrangement and geometric properties of the eight lens elements, the system achieves an extended effective focal length for a large imaging plane without a proportional increase in the linear length of the lens assembly.
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
This configuration enables the lens assembly to achieve both ultra-clear imaging and a compact, thin design, suitable for highly integrated electronic devices with improved manufacturing and molding processes.
Implementation Method 1
an optical imaging lens assembly including eight lenses, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, which have refractive powers respectively
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; a third lens having negative refractive power; a fourth lens having refractive power and a convex object-side surface; a fifth lens having refractive power and a concave object-side surface; a sixth lens having refractive power; a seventh lens having refractive power; and an eighth lens having refractive power. A total effective focal length f of the optical imaging lens assembly and half of a maximal field-of-view Semi-FOV of the optical imaging lens assembly satisfy: f*tan(Semi-FOV)>5.5 mm. A total effective focal length f of the optical imaging lens assembly and an effective focal length f1 of the first lens satisfy: 0.5<f/f1<1.5.