Imaging Lens Optical Path Converter Resolution Stabilization
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Solution Overview
Problem
Existing imaging lens systems for portable electronic devices face challenges in maintaining image quality and resolution when the angle of view changes, often resulting in reduced resolution due to image stabilization mechanisms.
Innovation Solution
The proposed imaging lens system consists of a first lens group with an optical path converter and a second lens group that is movable along the optical axis. This configuration satisfies specific conditional expressions to maintain image quality and resolution across varying angles of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image stabilization is performed by driving the entire imaging lens system or some lenses in a direction intersecting the optical axis, then image stabilization function is achieved, but the angle of view changes and resolution is reduced
Solution Approach 1:
The imaging lens system is divided into multiple lens groups (first lens group including front and rear lenses, second lens group with multiple lenses). The front lens and rear lens are positioned at specific distances from the optical path converter, creating segmented functional units that can be optimized independently for stabilization and resolution maintenance.
Solution Approach 2:
The patent establishes specific parameter ranges: the distance from the optical path converter to the front lens is set between 0.050×R1 and 0.60×R1, and to the rear lens between 0.20×|R4| and 1.00×|R4|. These parameter optimizations enable the system to maintain resolution while achieving image stabilization through controlled lens positioning.
2Reliability
If the angle of view changes due to lens movement for image stabilization, then image stabilization is achieved, but image quality deteriorates
Solution Approach 1:
The optical path converter (prism) redirects light at approximately 90 degrees, changing the dimensional orientation of the optical path. This allows image stabilization to be achieved by moving lenses along the optical axis without significantly affecting the angle of view or image quality, as the stabilization movement occurs in a different dimensional plane than the image capture direction.
Solution Approach 2:
By controlling the focal lengths and positioning distances within specific ranges (front lens distance 0.050×R1 to 0.60×R1, rear lens distance 0.20×|R4| to 1.00×|R4|), the system maintains optimal image quality parameters while enabling stabilization functionality.
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 described imaging lens system effectively minimizes resolution reduction and maintains image quality despite changes in the angle of view, ensuring consistent performance in portable electronic devices.
Implementation Method 1
the optical path converter may include a reflecting surface
Implementation Method 2
a first lens having a positive refractive power, a convex object-side surface in a paraxial region thereof
Data Source
AI summary
An imaging lens system includes a first lens group including one or more lenses and an optical path converter; and a second lens group including one or more lenses and configured to be movable in an optical axis direction, wherein the first lens group and the second lens group are sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, and the imaging lens system satisfies the conditional expression 1.50≤fPF/fPR≤6.50, where fPF is a focal length of a front lens of the first lens group disposed closest to an object side of the optical path converter, and fPR is a focal length of a rear lens of the first lens group disposed closest to an image side of the optical path converter.