Five-Lens Camera System with Optimized Refractive Power
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Solution Overview
Problem
Existing camera lenses with five lenses suffer from inadequate refractive power distribution, improper lens shapes, and insufficient center thickness, leading to insufficient wide-angle and high-luminous flux performance, as evident in previous patent publications (JP Patent Publication No. 2015-072424 and JP Patent Publication NO. 2015-060171).
Innovation Solution
A camera lens configuration comprising five lenses with specific refractive power conditions and non-spherical surfaces, including a glass plate between the fifth lens and the imaging plane, to correct aberrations and achieve optimal optical performance, with conditions such as 0.80≦f1/f≦1.00 and Fno≦2.2 for ultrathin and high-luminous flux wide-angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If five lenses are used with conventional refractive power distribution and shapes, then the lens structure is established, but the wide-angle and high-luminous flux performance is insufficient (Fno≧2.25, 2ω≦74.6°)
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the five lenses, specifically setting the first lens focal length ratio f1/f between 0.50-1.00 and the third lens focal length ratio f3/f between -2.00-0.50. The lens shapes are also optimized with specific curvature radius ratios (R1+R2)/(R1-R2) and (R3+R4)/(R3-R4) to achieve Fno≦2.2 and 2ω≧88° while correcting aberrations through precise parameter control
2Area of stationary object
If five lenses are used with conventional configuration, then the basic optical structure is formed, but the wide-angle capability is insufficient (2ω≦75.6°)
Solution Approach 1:
The patent achieves wide-angle capability (2ω≧88°) by changing the optical parameters including the focal length ratios of the first lens (f1/f: 0.50-1.00) and third lens (f3/f: -2.00-0.50), and optimizing the curvature radius ratios of the lens surfaces. These parameter changes enable the five-lens configuration to achieve 88° or greater view angle while maintaining manageable structural complexity
3Illumination intensity
If the center thickness of the fourth lens and overall focus distance are not properly proportioned, then the lens assembly is simplified, but the optical performance (Fno and 2ω) is insufficient
Solution Approach 1:
The patent optimizes the proportion between the center thickness of the fourth lens and the overall focus distance as a critical parameter. This parameter optimization, combined with the focal length ratios and curvature radius ratios, enables the lens system to achieve Fno≦2.2 and 2ω≧88° with balanced optical performance and compact dimensions
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 results in a camera lens with improved optical properties, achieving a full view angle of 2ω≧88° and Fno≦2.2, effectively correcting longitudinal and lateral aberrations, and ensuring ultrathin and wide-angle development.
Implementation Method 1
a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power
Data Source
AI summary
The present invention discloses a camera lens composed of five ultrathin and high-luminous flux wide angle lenses with excellent optical properties. The lenses are lined up in turn from the object side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power a fifth lens with negative refractive power. The camera lens meets specific conditions.