Camera Optical Lens with Aspherical Prism for Telephoto Miniaturization
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Solution Overview
Problem
The complexity and increased number of lens sheets in mobile phone lenses make it challenging to achieve high imaging quality and telephoto properties while maintaining a compact structure and low distortion, which is difficult to optimize and manufacture effectively.
Innovation Solution
A camera optical lens design using a combination of one prism and one lens sheet, where the optical path turning element has a refractive power with aspherical incident and exit surfaces and a planar reflecting surface, allowing light to be redirected, and a second lens with negative refractive power, optimizing focal length and image quality with fewer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens sheets is increased to achieve telephoto properties and high imaging quality, then the imaging quality and focal length are improved, but the system complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines multiple optical functions into fewer lens sheets. Specifically, it uses only two lens sheets (first and second lens sheets) to achieve telephoto properties and high imaging quality, whereas conventional systems require 7-8 lens sheets. This merging of functions reduces system complexity while maintaining imaging performance.
Solution Approach 2:
The first lens sheet is designed with multi-functional capabilities, incorporating both telephoto properties and aberration correction functions that would traditionally require separate components. This multi-functionality allows the system to achieve high imaging quality with fewer elements.
2Length of stationary object
If the number of lens sheets is increased to achieve telephoto properties and high imaging quality, then the focal length is improved, but the manufacturing difficulty increases
Solution Approach 1:
The patent merges multiple optical functions into fewer lens sheets, achieving a total effective focal length of 20mm≤f≤30mm with only two lens sheets. This reduces the number of manufacturing steps, alignment requirements, and assembly complexities compared to conventional 7-8 lens sheet systems.
Solution Approach 2:
The patent employs specific parameter ranges for the lens sheets, including refractive indices (1.45≤N1<1.68, 1.60≤N2<1.85), Abbe numbers (20≤V1<60, 20≤V2<60), and focal length ratios (0.30≤f1/f≤0.70, −0.50≤f2/f≤0.10), which optimize both the achieved focal length and manufacturability within controlled tolerances.
3Measurement precision
If more lens sheets are used to correct aberrations and improve image quality, then the imaging quality is improved, but the light loss increases
Solution Approach 1:
The patent combines aberration correction and image quality enhancement functions into the two lens sheets through careful design of their refractive powers, curvatures, and spacing. This eliminates the need for additional correction lenses that would further reduce light transmission, thereby maintaining high image quality with minimal light loss.
4Measurement precision
If the number of lens sheets is increased to achieve high imaging quality, then the aberration correction is improved, but the distortion increases
Solution Approach 1:
The patent employs specific parameter ranges and conditional expressions (0.30≤f1/f≤0.70, −0.50≤f2/f≤0.10, 1.45≤N1<1.68, 1.60≤N2<1.85, 20≤V1<60, 20≤V2<60) that simultaneously optimize aberration correction and control distortion, achieving high imaging quality with fewer lens sheets while maintaining geometric accuracy.
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-long effective focal length, miniaturization, and high imaging quality with a simpler structure, reducing light loss and improving aberration correction, making it suitable for portable electronic products.
Implementation Method 1
The optical path turning element has a refractive power and has an incident surface, a reflecting surface and an exit surface, both the incident surface and the exit surface are aspherical lens surfaces
Implementation Method 2
the reflecting surface is a planar lens surface, and the optical path turning element is configured so that light incident on the optical path turning element through the incident surface along a direction of a Y optical axis is reflected by the reflecting surface
Data Source
AI summary
A camera optical lens is provided consisting of: an optical path turning element and a second lens having a refractive power. The optical path turning element has a refractive power and has an incident surface, a reflecting surface and an exit surface, both the incident surface and the exit surface are aspherical lens surfaces, the reflecting surface is a planar lens surface. The optical path turning element is configured so that light incident on the optical path turning element through the incident surface along a direction of a Y optical axis is reflected by the reflecting surface and then exits through the exit surface along a direction of an X optical axis, where the direction of the Y optical axis and the direction of the X optical axis cross each other; and wherein a total effective focal length f of the camera optical lens can satisfy 20 mm≤f≤30 mm.