Six-Lens Camera Optical Lens Design for High Luminance
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Solution Overview
Problem
Conventional camera lenses for handheld devices suffer from insufficient luminance and optical characteristics due to inadequate refractive index distribution and shape, particularly in the first and fourth lenses, which hinders the achievement of high light flux and miniaturization.
Innovation Solution
A camera optical lens design comprising six lenses with specific refractive powers and curvature radii, including aspherical surfaces, that satisfy certain conditions to optimize the focal lengths and refractive power ratios, ensuring high light flux and excellent optical characteristics while maintaining miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional camera lens designs with six lenses are used, then the basic optical function is achieved, but the luminance is insufficient for Fno≥2.14
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive index distribution and shape parameters of the first and fourth lenses. Specifically, it sets the refractive index nd1=1.5441 and Abbe number v1=56.04 for the first lens, and nd4=1.6398 and v4=23.27 for the fourth lens, along with specific curvature radii and thickness parameters to achieve Fno=1.82 while maintaining excellent optical characteristics
Solution Approach 2:
The patent uses composite material principles by selecting specific glass materials with precise refractive indices and Abbe numbers for each lens element. The first lens uses material with nd1=1.5441, v1=56.04, while the fourth lens uses nd4=1.6398, v4=23.27, creating a composite optical system that achieves both high luminance and good aberration correction
2Volume of moving object
If the pixel size of photosensitive devices is reduced for miniaturization, then the device size decreases, but achieving good imaging quality becomes more difficult
Solution Approach 1:
The patent applies local quality by giving each lens element specific refractive index distributions and shape characteristics tailored to its position in the optical system. The first lens has object-side convex and image-side concave surfaces with specific curvature radii (R1=1.6568mm, R2=4.4458mm), while the fourth lens has object-side concave and image-side convex surfaces (R7=5.7524mm, R8=4.8358mm), optimizing local optical properties to maintain imaging quality in miniaturized devices
Solution Approach 2:
The patent uses spheroidality by incorporating aspherical surface designs in the lens elements. The first lens has aspherical object and image surfaces with specific curvature radii, and the fourth lens similarly employs aspherical surfaces to correct aberrations and maintain imaging quality while enabling device miniaturization
3Use of energy by moving object
If the Fno value is reduced to increase light flux, then more light is captured, but optical characteristics and aberration correction deteriorate
Solution Approach 1:
The patent achieves Fno=1.82 by optimizing parameter combinations including the refractive indices (nd1=1.5441, nd4=1.6398), Abbe numbers (v1=56.04, v4=23.27), curvature radii (R1=1.6568mm, R2=4.4458mm, R7=5.7524mm, R8=4.8358mm), and thickness parameters (d1=0.598mm, d7=0.325mm) of the first and fourth lenses, balancing light flux and optical characteristics
Solution Approach 2:
The patent uses composite material selection with specific glass properties for the first lens (nd1=1.5441, v1=56.04) and fourth lens (nd4=1.6398, v4=23.27) to achieve the desired balance between high light flux (Fno=1.82) and excellent optical characteristics, leveraging the complementary properties of different glass materials
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 design achieves high light flux and excellent optical characteristics with miniaturization, as demonstrated by the Fno value of 1.82 and optimal aberration correction, 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
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image 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 negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power. The camera optical lens further satisfies specific conditions.