Anamorphic Optical Imaging Lens Group for Wide Aspect Ratio
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Solution Overview
Problem
Current smartphone lens assemblies with a 16:9 aspect ratio cannot capture images with a wide aspect ratio without cropping, which distorts the original photo, and require external anamorphic lenses that are difficult to precisely connect and require specialized software.
Innovation Solution
An optical imaging lens group comprising eight lenses with refractive powers, including non-rotationally symmetric aspheric surfaces, optimized to achieve a total effective focal length ratio of fy/fx < 0.8 and f-number Fnoy < 2.9, allowing for a wide aspect ratio imaging effect without external lenses or cropping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a 16:9 aspect ratio lens assembly is used, then the lens assembly can be compact and standard, but it cannot capture images with a wide aspect ratio without cropping
Solution Approach 1:
The patent employs non-rotationally symmetric aspheric surfaces on specific lenses (first, third, fifth, and eighth lenses) to create an optical system that can capture wide aspect ratio images. The aspheric coefficients are specifically designed to achieve different focal lengths in different directions (fy/fx < 0.8), enabling the lens assembly to capture images with aspect ratios wider than 16:9 without cropping or external anamorphic lenses.
2Adaptability or versatility
If external anamorphic lens assembly is connected to achieve wide aspect ratio, then wide aspect ratio imaging is possible, but the connection precision requirement is high and special software is required
Solution Approach 1:
The patent integrates the wide aspect ratio imaging function directly into the smartphone's native lens assembly by incorporating non-rotationally symmetric aspheric surfaces on multiple lenses within the existing optical path. This merges the functionality of external anamorphic lenses with the phone's standard lens assembly, eliminating the need for external connections and specialized software while achieving the same wide aspect ratio imaging effect.
3Adaptability or versatility
If non-rotationally symmetric aspheric surfaces are used, then wide aspect ratio imaging is achieved, but the manufacturing precision requirement increases
Solution Approach 1:
The patent applies non-rotationally symmetric aspheric surfaces selectively to specific lenses (first, third, fifth, and eighth lenses) rather than all lenses. Each selected lens has optimized aspheric coefficients tailored to its specific position and function in the optical system. This localized approach achieves wide aspect ratio imaging while managing manufacturing complexity by limiting the high-precision requirements to only the most critical lenses.
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 optical imaging lens group enables wide aspect ratio imaging without distortion, miniaturization, and good imaging quality, addressing the limitations of current smartphone lens assemblies.
Implementation Method 1
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 having refractive powers
Data Source
AI summary
The present disclosure discloses an optical imaging lens group. The optical imaging lens group comprises, sequentially along an optical axis from an object side to an image side, 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, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens have refractive powers. At least one lens in the first lens to the eighth lens has a non-rotationally symmetric aspheric surface; a total effective focal length fy of the optical imaging lens group in a Y-axis direction and a total effective focal length fx of the optical imaging lens group in an X-axis direction satisfy: fy/fx<0.8; and an f-number Fnoy of the optical imaging lens group in the Y-axis direction satisfies: Fnoy<2.9.