Five-Lens Camera System Narrow Angle Optical Design
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Solution Overview
Problem
Existing camera lenses with five lenses fail to achieve a narrow angle of view while maintaining good optical properties, as previous designs with similar configurations result in angles greater than 37° or 51.75°, which are not sufficient for modern portable and web camera applications.
Innovation Solution
A camera lens system comprising five lenses with specific refractive powers and aspheric surfaces, where the first lens has positive refractive power, the second and fourth lenses have negative refractive power, and the third and fifth lenses have positive refractive power, with glass plates between the fifth lens and the imaging plane, adhering to specific relational expressions for center thickness, focal lengths, and curvature radii to achieve a narrow angle of view less than 20°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five-lens configuration is used with conventional refractive power arrangements, then the lens system achieves good optical properties, but the angle of view becomes too wide (greater than 37° or 51.75°) and does not meet the narrow angle requirement
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers of individual lenses through the relationships f1/f2 and f3/f4, adjusting the curvature radii ratios (R1/R2, R3/R4, R5/R6), and setting specific thickness-to-focal-length ratios (d1/f, d3/f). These parameter adjustments transform the conventional five-lens configuration to achieve both narrow angle of view (less than 20°) and good optical properties simultaneously
Solution Approach 2:
The patent introduces aspheric surfaces on multiple lens elements (first, second, third, fourth, and fifth lenses) with dynamically optimized aspheric coefficients. This allows the lens surfaces to adaptively correct aberrations across different field angles, enabling the system to maintain good optical properties while achieving the narrow angle of view requirement
2Shape
If the angle of view is reduced to less than 20°, then the narrow angle requirement is met, but maintaining good optical properties becomes difficult with conventional five-lens designs
Solution Approach 1:
The patent employs parameter changes by establishing specific mathematical relationships between lens parameters: the focal length ratios (0.45≤|f1/f2|≤0.65 and 0.30≤|f3/f4|≤0.50), curvature radius ratios (−0.30≤R1/R2≤−0.05, 0.05≤R3/R4≤0.30, −0.30≤R5/R6≤−0.05), and thickness ratios (0.20≤d1/f≤0.40, 0.01≤d3/f≤0.06). These constrained parameter changes enable the narrow angle design to maintain good optical properties
Solution Approach 2:
The patent utilizes spheroidality by implementing aspheric surfaces on all five lens elements with specifically designed aspheric coefficients. The aspheric profiles enable precise control of light ray paths at narrow angles, correcting spherical aberration and other optical imperfections that would otherwise degrade image quality in narrow-angle 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
The solution effectively achieves a narrow angle of view while maintaining good optical properties, as demonstrated by Embodiments 1 to 5, which satisfy the relational expressions and exhibit improved spherical aberration, chromatic aberration, field curvature, and distortion performance.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power
Data Source
AI summary
The present disclosure provides a camera lens which has good optical properties and a narrow angle, and includes five lenses. The camera lens includes, from an object side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, and a fifth lens having a positive refractive power. The camera lens satisfies specified relational expressions.