Optical System Lens Group Configuration for Compact Autofocus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing camera modules with multiple lenses face challenges in achieving excellent optical and aberration characteristics due to increased length and complexity, which complicates autofocus and zoom functions, and makes it difficult to maintain a compact size.
Innovation Solution
The optical system comprises a first and second lens group with opposite refractive powers, arranged along the optical axis, where the focal lengths of the lens groups satisfy a specific ratio, allowing for minimized movement and power consumption during autofocus and zoom operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple imaging lenses are included to achieve high image quality and high resolution, then optical performance is improved, but the length of the entire optical system increases and it becomes difficult to maintain excellent optical and aberration characteristics
Solution Approach 1:
The optical 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) rather than using a single complex lens. Each group has specific focal length ratios (0.3 < f1/f2 < 2.0 and 0.5 < f2/f3 < 2.0) to control aberrations while maintaining compact overall length. This segmentation allows independent optimization of each group's function.
Solution Approach 2:
The patent specifies precise parameter ranges for the lens groups including focal length ratios (0.3 < f1/f2 < 2.0, 0.5 < f2/f3 < 2.0), refractive power signs, and spacing relationships. These parameter constraints ensure that the optical system achieves excellent aberration correction and optical characteristics while maintaining a compact form factor suitable for mobile devices.
2Adaptability or versatility
If the position of lens or lens group is controlled to perform zoom and autofocus functions, then functional versatility is improved, but the amount of movement increases exponentially requiring more energy
Solution Approach 1:
The optical system employs dynamic movement of lens groups along the optical axis to achieve autofocus and zoom functions. The first, second, and third lens groups can move independently with controlled distances, allowing the system to adapt to different focusing and zooming requirements while minimizing unnecessary movement and energy consumption.
Solution Approach 2:
The patent defines specific parameter relationships including focal length ratios and movement distance constraints for the lens groups. By controlling the movement distances of each lens group within optimized ranges, the system achieves versatile autofocus and zoom capabilities while minimizing the exponential increase in movement amounts and associated energy consumption.
3Manufacturing precision
If multiple lenses are included with increased thickness and spacing, then optical performance is improved, but the overall length and height of the optical system increase making it difficult to provide smaller devices
Solution Approach 1:
The optical system arranges multiple lens groups in a nested configuration along the optical axis, where the first, second, and third lens groups are positioned sequentially with optimized spacing. This nested arrangement allows multiple lenses to be compactly integrated without excessive overall length or height, enabling excellent optical characteristics within a small form factor suitable for mobile devices.
Solution Approach 2:
The patent optimizes the spatial arrangement of lens groups by controlling their positions and spacing along the optical axis, effectively utilizing the available dimensional space. The specific focal length ratios and spacing relationships enable the system to achieve excellent optical performance while minimizing the overall envelope dimensions of the optical module.
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 enhances optical characteristics, minimizes image quality deterioration in peripheral areas, reduces power consumption, and enables a compact, slim camera module design capable of providing autofocus for subjects at various distances.
Implementation Method 1
a first lens group and a second lens group each including at least one lens, the refractive power sign of the first lens group and the refractive power sign of the second lens group are opposite to each other
Data Source
AI summary
The optical system according to the embodiment comprises a first lens group and a second lens group sequentially arranged along an optical axis from an object side to an image side and wherein each of the first and second lens groups including at least one lens; wherein a refractive power sign of the first lens group and a refractive power sign of the second lens group are opposite to each other; and wherein the first lens group and the second lens group satisfy equations 1 and 8 below:0.6<<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"</annotation></semantics>f_1/f_2<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"</annotation></semantics><1.4 is satisfied,[Equation 1](f_1 is a focal length of the first lens group, and f_2 is a focal length of the second lens group.)2<T34_2/T34_1<7[Equation 8](In Equation 8, T34_1 is a distance between a third lens and a fourth lens at a maximum moving distance of the second lens group in a first mode, T34_2 is a distance between a third lens and a fourth lens at a maximum moving distance of the second lens group in a second mode.)