Reflective Imaging Lens Layout for Close and Infinity Focus
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Solution Overview
Problem
Camera modules in limited spaces, such as portable terminals, struggle to capture subjects at both infinite and very close distances with uniform resolution due to size limitations.
Innovation Solution
An imaging lens system comprising a specific arrangement of lenses with reflective surfaces and refractive properties, including a first lens with a convex object-side surface and a second lens group that can move along the optical axis to adjust focus, satisfying conditional expressions for focal length and distance ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a camera module is mounted in limited spaces such as portable terminals, then the device size is reduced, but the ability to capture subjects at both infinite and very close distances with uniform resolution deteriorates
Solution Approach 1:
The imaging lens system is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, third lens group with positive refractive power) that can move independently along the optical axis. This segmentation allows each group to be optimized for specific focal ranges while maintaining compact overall size, resolving the contradiction between small device volume and uniform resolution across different object distances.
Solution Approach 2:
The patent implements a dynamic lens system where the first, second, and third lens groups can move along the optical axis to adjust focus. The second lens group specifically moves between first and second positions to capture subjects at different distances. This dynamic adjustment enables the compact camera module to achieve uniform resolution for both close-up and distant subjects without increasing overall device volume.
2Adaptability or versatility
If lens groups are moved to capture subjects at different distances, then the focus adjustment capability is improved, but the device complexity increases
Solution Approach 1:
The imaging lens system achieves multi-functionality by using three lens groups that can be positioned in different configurations along the optical axis. The same lens groups serve multiple functions: capturing subjects at infinite distance, very close distances, and intermediate ranges. This universal design provides versatile focus adjustment without proportionally increasing device complexity, as the lens groups share common structural elements.
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
Enables capturing subjects at both infinite and extremely-close distances with uniform resolution, optimizing lens system size and aberration correction.
Implementation Method 1
a first lens including a reflective surface... the first lens may have a convex object-side surface
Implementation Method 2
a first lens including a reflective surface
Implementation Method 3
a second lens... a third lens... a fourth lens... a fifth lens... a sixth lens... a seventh lens... and an eighth lens sequentially disposed from an object side
Implementation Method 4
configured to capture images of subjects located at infinite and close distances with uniform resolution
Data Source
AI summary
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially disposed from an object side, wherein the first lens includes a reflective surface, and the imaging lens system satisfies 0<f1/f<20, where f is a focal length of the imaging lens system and f1 is a focal length of the first lens.