Six-Plastic-Lens Optical Layout for High-Resolution Mobile Cameras
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Solution Overview
Problem
Conventional mobile camera optical systems face challenges in achieving high resolution and reducing manufacturing costs due to the use of expensive glass lenses, which also hinder weight reduction.
Innovation Solution
An optical system comprising six aspherical plastic lenses, arranged with specific refractive powers and configurations, including an aperture stop to block unnecessary light, and an optical filter to manage infrared rays, while adhering to conditional expressions for optical power, chromatic aberration, and lens shape, to achieve high resolution and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If glass lenses with high optical performance are used to achieve high resolution, then resolution is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive glass lenses with cheaper plastic lenses that can be mass-produced through injection molding. The plastic lenses achieve sufficient optical performance for mobile cameras while dramatically reducing material cost and manufacturing complexity compared to precision glass lens fabrication.
Solution Approach 2:
The patent changes the material parameter from glass to plastic, which has different optical properties including lower refractive index and different dispersion characteristics. This material substitution enables cost reduction while maintaining acceptable optical performance through careful selection of plastic formulations and lens design parameters.
2Measurement precision
If multiple glass lenses are used to overcome resolution problems, then resolution is improved, but weight of the optical system increases
Solution Approach 1:
The patent substitutes heavy glass lenses with lightweight plastic lenses. Plastic materials have significantly lower density than glass, reducing the weight of each lens while maintaining the necessary optical function. This substitution directly addresses the weight penalty associated with using multiple high-performance glass lenses.
Solution Approach 2:
The patent employs composite plastic materials that combine optical transparency with lightweight properties. These plastic compositions are engineered to provide the necessary refractive indices and optical characteristics while minimizing weight, offering an alternative to traditional glass lens materials.
3Measurement precision
If multiple expensive glass lenses are used to achieve high resolution, then resolution is improved, but device complexity increases
Solution Approach 1:
The patent simplifies the optical system by using plastic lenses that can be manufactured through injection molding, eliminating the need for complex precision machining and coating processes required for glass lenses. This manufacturing approach reduces overall system complexity while achieving the required resolution performance.
Solution Approach 2:
The patent divides the optical system into multiple plastic lens elements with specific refractive powers assigned to each segment. This segmentation allows the complex optical function to be distributed across simpler individual components that are easier to manufacture and assemble compared to a single complex glass lens system.
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 system achieves high resolution, reduces manufacturing costs, and minimizes weight by using plastic lenses, with improved aberration correction and chromatic aberration management, suitable for mobile devices.
Implementation Method 1
a first lens having a positive refractive power and an object-side surface convex toward the object side; a second lens having a negative refractive power and an upwardly concave upper surface
Implementation Method 2
an aperture stop disposed in front of the first lens or between the first lens and the second lens to block unnecessary light of the light incident or passing through the optical system
Implementation Method 3
an optical filter to manage infrared rays
Data Source
AI summary
The present invention relates to a high resolution optical system. The optical system of the present invention includes, sequentially from an object side, a first lens having a positive refractive power and an object-side surface convex toward the object side; a second lens having a negative refractive power and an upwardly concave upper surface; 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 an upwardly convex upper surface; and a six lens having a negative refractive power and an upwardly concave upper surface.