Optical Imaging System with Movable Lens Group for Resolution Uniformity
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Solution Overview
Problem
Existing optical imaging systems in mobile devices face challenges in achieving high resolution and maintaining uniform resolution across various focal lengths, particularly when imaging subjects at ultra-short distances.
Innovation Solution
The proposed optical imaging system consists of a first lens group with a fixed position and a second movable lens group, both comprising multiple lenses. The system is designed to satisfy specific conditional expressions regarding lens materials, refractive powers, and optical parameters, ensuring efficient reduction of aberrations and maintaining consistent performance across different distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a reflective member is used to bend light path and achieve long focal length, then the focal length is extended in limited space, but the image sensor must be slimmed which reduces the number of pixels and resolution
Solution Approach 1:
The patent replaces the reflective member (mechanical/optical system using mirrors) with a lens-based refractive system. The lens group uses refraction through multiple lens elements (including aspherical lenses) to achieve the same light-bending function, eliminating the need for a reflective member and allowing a different optical path configuration that can accommodate higher pixel density sensors.
Solution Approach 2:
The patent changes the optical path configuration from a folded path using reflection to a more direct path through the lens group. By using aspherical lenses and optimizing the arrangement of lens elements, the system achieves long focal length functionality without requiring the space-folded configuration, thereby allowing for a different sensor placement and higher pixel count.
2Measurement precision
If a large-sized image sensor is used to maintain resolution, then the number of pixels is increased, but the thickness of the mobile device increases
Solution Approach 1:
The patent changes the optical parameters of the system by introducing aspherical lenses and optimizing the refractive indices and curvatures of lens surfaces. This allows for a compact lens group design that can focus light effectively on a smaller sensor, maintaining resolution without requiring a larger sensor that would increase device thickness.
Solution Approach 2:
The patent divides the optical system into multiple lens elements (first lens, second lens, third lens, etc.) with specific functions. The aspherical lenses are segmented into specific positions within the lens group to control aberrations and focus light efficiently, allowing for a compact overall design that maintains high resolution on a smaller sensor.
3Adaptability or versatility
If the optical system is designed for long focal length, then distant subjects are imaged well, but ultra-short distance imaging performance deteriorates
Solution Approach 1:
The patent employs a movable lens group that can change position to adjust the focal length dynamically. The second lens group is configured to move along the optical axis, allowing the system to switch between telephoto mode (for distant subjects) and macro mode (for ultra-short distance subjects). This dynamic adjustment maintains high resolution across different imaging distances.
Solution Approach 2:
The patent designs the lens group to serve multiple functions: the first lens group provides the primary optical power for telephoto imaging, while the second movable lens group enables both telephoto and macro imaging capabilities. This multi-functional design allows a single optical system to handle both long-distance and ultra-short-distance subjects with high resolution.
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 allows the optical imaging system to maintain uniform resolution and effectively image subjects at both long and ultra-short distances, addressing the limitations of existing systems.
Implementation Method 1
a first lens group including a first lens, a second lens, and a third lens, and a second lens group including a fourth lens, a fifth lens, and a sixth lens
Data Source
AI summary
An optical imaging system includes a first lens group including a first lens, a second lens, and a third lens, and a second lens group including a fourth lens, a fifth lens, and a sixth lens and configured to be movable in an optical axis direction, wherein the first lens group and the second lens group are disposed in order from an object side toward an image plane side, and wherein conditional expression 1.50<(v1−v2)/(v3−v2)<2.50 is satisfied, where v1 is an Abbe number of the first lens, v2 is an Abbe number of the second lens, and v3 is an Abbe number of the third lens.