Five-Lens Camera Module for Compact Telescopic Imaging
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Solution Overview
Problem
Existing camera optical systems with wide viewing angles and short object distances fail to capture images of distant small objects effectively, leading to large volume occupation and inadequate small-size design capabilities.
Innovation Solution
A lens assembly comprising a meniscus lens with positive refractive power, a convex lens, a lens with negative refractive power, a meniscus lens with negative refractive power, and a lens with positive refractive power, optimized to achieve a long focal length and short total length, with aspheric surfaces and an aperture stop to reduce aberration and improve resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-group zoom lens design with spherical lenses is used to achieve telescopic capacity, then the camera can capture images of distant small objects, but the camera occupies a large volume
Solution Approach 1:
The lens assembly is divided into five distinct lens groups (first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5) with different refractive powers and surface configurations. Each lens group contributes specifically to achieving the desired focal length while minimizing total length, resolving the contradiction between telescopic capacity and compact size.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lenses instead of traditional spherical lenses. This curvature variation allows for better optical performance in a more compact configuration, enabling telescopic capability while reducing the overall camera volume compared to conventional spherical lens designs.
2Volume of moving object
If existing camera optical systems are designed for wide viewing angle and short object distance, then the camera structure is compact, but it cannot effectively capture images of distant small objects
Solution Approach 1:
The patent achieves a breakthrough by obtaining a positive effective focal length (EFL) greater than the total track length (TTL), with TTL/EFL ratios of 0.3 to 0.8. This parameter inversion, combined with specific focal length ratios between lens groups (e.g., |f3/EFL| between 0.3-1.0, |f4/EFL| between 0.2-0.8), enables distant object capture while maintaining compact camera dimensions.
3Adaptability or versatility
If the focal length is increased to achieve long-distance photography, then the camera can capture distant small objects, but the total length of the camera increases
Solution Approach 1:
The lens assembly compactly nests five lens groups with alternating positive and negative refractive powers in a confined space. The strategic arrangement of convex and concave surfaces, along with aspheric elements, allows the system to achieve long effective focal length while keeping the physical total length short, effectively implementing a nested configuration that resolves the length-focal length contradiction.
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 lens assembly achieves a long focal length, reduces aberration, improves resolution, and effectively controls the total length, meeting the requirements of small-size camera designs while maintaining telescopic capability.
Implementation Method 1
a first lens, which is a meniscus lens with positive refractive power; a second lens, which is a lens with positive refractive power; a third lens, which is a lens with negative refractive power; a fourth lens, which is a meniscus lens with negative refractive power; and a fifth lens, which is a lens with positive refractive power
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged along an optical axis in order from an object side to an image side. The first lens is a meniscus lens with positive refractive power, and an object-side surface of the first lens is convex. The second lens is a lens with positive refractive power, and an object-side surface of the second lens is convex. The third lens is a lens with negative refractive power, and an object-side surface and an image-side surface of the third lens are concave. The fourth lens is a meniscus lens with negative refractive power. The fifth lens is a lens with positive refractive power, and an object-side surface of the fifth lens is convex.