Eccentric Lens Group Reduces Flare in Prismatic Imaging Systems
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Solution Overview
Problem
The existing imaging lens systems with optical path conversion elements, such as prisms, suffer from a flare phenomenon due to internal reflection, which deteriorates the resolution of the camera module.
Innovation Solution
The proposed imaging lens system includes a first lens group, an optical path conversion element, and a second lens group arranged in order from the object side, with specific eccentric dispositions of the optical axes and refractive powers of the lenses to minimize flare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an optical path conversion element (prism) is introduced to enable thinning and miniaturization of the camera module, then the camera module can achieve compact size, but internal reflection occurs causing flare phenomenon that deteriorates resolution
Solution Approach 1:
The patent applies asymmetry by making the optical axis of the second lens group eccentric relative to the geometric optical axis of the optical path conversion element. This asymmetric configuration prevents light from entering the side surfaces of the prism, thereby eliminating the flare phenomenon caused by internal reflection while maintaining the compact camera module design
Solution Approach 2:
The patent converts the potentially harmful effect of the optical path conversion element (prism) by strategically positioning lens groups with specific eccentricities. This transforms the prism from a source of harmful internal reflection into a beneficial optical path converter that enables miniaturization without flare, as the asymmetric configuration ensures light only enters the intended surfaces
2Object-affected harmful factors
If the optical axis of the second lens group is disposed eccentrically with respect to the geometric optical axis of the optical path conversion element, then the flare phenomenon is reduced, but the device complexity increases
Solution Approach 1:
The patent implements asymmetry through the eccentric disposition of the second lens group's optical axis relative to the optical path conversion element's geometric optical axis. This asymmetric arrangement is a deliberate design choice that reduces flare by preventing light entry into side surfaces, accepting the increased configuration complexity as necessary for achieving the harmful factor reduction
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
This configuration effectively reduces the flare phenomenon caused by internal reflection, thereby enhancing the resolution and performance of the imaging lens system.
Implementation Method 1
The optical path conversion element may separate an optical path of an imaging lens system elongated in one direction in two or more directions
Implementation Method 2
a first lens group, an optical path conversion element, and a second lens group arranged in order from an object side
Data Source
AI summary
An imaging lens system includes a first lens group, an optical path conversion element, and a second lens group arranged in order from an object side. An optical axis of the second lens group is disposed eccentrically in a direction with respect to a geometric optical axis of the optical path conversion element.