Optical Imaging Lens Group with Prisms for Ultra-Low Distortion
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Solution Overview
Problem
The challenge is to design a camera lens that balances small size, low distortion, and high image quality while being lightweight and thin, suitable for portable electronic devices like mobile phones and digital cameras, which requires innovative optical design to meet the demands of miniaturization and humanized design.
Innovation Solution
The optical imaging lens group consists of a sequence of components including two prisms and five lenses with specific refractive powers and surface types, such as convex and concave surfaces, and aspherical mirror surfaces, carefully arranged to achieve ultra-small distortion and miniaturization, with optical distortion limited to less than 0.1% and optimized focal lengths and curvature radii to enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera lens is designed to be smaller and thinner for portable devices, then the device size and weight are reduced, but the imaging quality and distortion control deteriorate
Solution Approach 1:
The camera lens is divided into five separate lens elements (first lens E1, second lens E2, third lens E3, fourth lens E4, and fifth lens E5), each with specific refractive powers and surface configurations. This segmentation allows each element to contribute differently to the overall optical performance, enabling distortion control and image quality maintenance even in a compact form factor.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lens elements, including the object-side surface of the first lens, the image-side surface of the second lens, and both surfaces of the third lens. These aspherical configurations enable precise control of light rays across different field angles, effectively reducing distortion while maintaining a small overall lens size.
2Manufacturing precision
If more lens elements are added to improve imaging quality and reduce distortion, then the optical performance improves, but the device complexity and size increase
Solution Approach 1:
The patent combines multiple optical functions into a single integrated lens group structure. The five lens elements are arranged in sequence along the optical axis with specific spacing relationships, merging functions such as light convergence, divergence, and distortion correction into one compact assembly. This eliminates the need for separate adjustment mechanisms and reduces overall structural complexity.
Solution Approach 2:
The patent optimizes specific parameter relationships to control complexity. Key parameter ratios are constrained within specific ranges: the curvature radius of the object-side surface of the first lens (R1) relative to the effective focal length (f) satisfies 0.2 < R1/f < 0.8, and the curvature radius of the image-side surface of the third lens (R6) relative to its effective focal length (f5) satisfies 0.5 < R6/f5 < 1.5. These parameter constraints enable effective distortion control without requiring excessive lens elements or complex configurations.
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 design achieves ultra-small distortion, good imaging quality, and miniaturization, making it suitable for compact electronic devices while maintaining the balance of refractive power distribution and tolerance sensitivity, thus effectively addressing the need for a lightweight and thin camera lens.
Implementation Method 1
a first prism with a first reflective surface... a second prism with a second reflective surface
Implementation Method 2
a first lens with a refractive power... a second lens with a refractive power... a third lens with a refractive power... a fourth lens with a refractive power... a fifth lens with a refractive power
Data Source
AI summary
The disclosure discloses an optical imaging lens group, which sequentially includes from an object side to an image side along an optical axis: a first prism has a first reflective surface; a first lens has a refractive power and an object-side surface thereof is a convex surface; a second lens has a refractive power; a third lens has a refractive power, an object-side surface thereof is a concave surface and an image-side surface thereof is a convex surface; a fourth lens has a refractive power; a fifth lens has a refractive power; and a second prism has a second reflective surface. An optical distortion Dist. of the optical imaging lens group satisfies: |Dist.|<0.1%.