Seven-Lens Module with Composite Materials for Aberration Control
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Solution Overview
Problem
The miniaturization and weight reduction of camera modules in mobile communications terminals pose challenges for achieving high resolution and performance, particularly with plastic lenses that suffer from chromatic aberrations and limited optical brightness compared to glass lenses.
Innovation Solution
A lens module comprising seven lenses with specific refractive powers and surface configurations, including inflection and turning points, optimized by conditional expressions to improve aberration correction and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lenses are formed of plastic to reduce weight, then weight is reduced, but chromatic aberrations increase and optical brightness deteriorates
Solution Approach 1:
The patent employs a composite lens structure where the first lens is made of plastic material and the second lens is made of glass material. This composite approach allows the system to benefit from the weight advantages of plastic while utilizing the superior optical properties of glass for aberration correction, thereby resolving the contradiction between weight reduction and chromatic aberration control
2Weight of moving object
If lenses are formed of plastic to reduce weight, then weight is reduced, but optical brightness deteriorates
Solution Approach 1:
By combining plastic and glass materials in the lens system, the patent achieves a balance between weight reduction and optical brightness. The glass component specifically addresses the brightness deterioration issue while the plastic component maintains the weight advantage
3Measurement precision
If five or more lenses are used to achieve high resolution, then resolution is improved, but device complexity increases
Solution Approach 1:
The patent optimizes specific parameters of the lens system including the focal length ratio (0.3 < f1/f < 0.6) and the use of aspheric surfaces on specific lenses to achieve high resolution with a controlled number of lens elements, thereby managing device complexity while maintaining measurement precision
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 lens module enhances image quality by reducing aberrations and enabling high resolution while maintaining a compact size, thus addressing the limitations of plastic lenses in mobile camera modules.
Implementation Method 1
a first lens L1 having positive refractive power; a second lens L2 having refractive power; a third lens L3 having positive refractive power; a fourth lens L4 having refractive power; a fifth lens L5 having refractive power; a sixth lens L6 having refractive power; and a seventh lens L7 having negative refractive power
Data Source
AI summary
A lens module may include a first lens having positive refractive power, a second lens having refractive power, a third lens having positive refractive power, a fourth lens having refractive power, a fifth lens having refractive power, a sixth lens having refractive power, and a seventh lens having negative refractive power. An inflection point may be formed on an image-side surface of the sixth lens. A turning point may be formed on an image-side surface of the seventh lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are disposed in a sequential order from the first lens to the seventh lens.