Seven-Lens Optical System for Aberration Control in Slim Camera Modules
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Solution Overview
Problem
Existing optical systems with multiple lenses face challenges in achieving high optical efficiency and compact size due to difficulties in deriving excellent optical properties and aberration properties, and the overall size is increased by the thickness and interval of multiple lenses.
Innovation Solution
An optical system comprising seven lenses arranged along an optical axis, where specific lenses have positive or negative refractive powers, convex or concave surfaces, and satisfy certain radius and inflection point conditions, including a meniscus shape for some lenses, to improve optical properties and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple lenses are included to improve optical efficiency and image quality, then optical properties and resolution are improved, but the overall length and height of the module increase due to the thickness and interval of the lenses
Solution Approach 1:
The patent applies nesting by placing the optical system within a compact housing structure where lenses are arranged in a nested configuration. The barrels and lens elements are positioned to maximize space utilization, with each lens element nested within the structural framework of the previous elements, thereby reducing the overall module length while maintaining the required optical path length.
Solution Approach 2:
The patent transitions from a linear arrangement of lenses to a multi-dimensional compact structure. By utilizing vertical stacking and angular positioning of lens elements, the optical system achieves high optical efficiency without extending the horizontal length of the module. The lens elements are positioned in three-dimensional space to optimize both optical performance and compactness.
2Manufacturing precision
If multiple lenses are included to achieve high resolution and image quality, then optical efficiency is improved, but the height of the module increases due to the size of the lenses
Solution Approach 1:
The patent applies nesting by placing the optical system within a compact housing structure where lenses are arranged in a nested configuration. The barrels and lens elements are positioned to maximize space utilization, with each lens element nested within the structural framework of the previous elements, thereby reducing the overall module length while maintaining the required optical path length.
Solution Approach 2:
The patent utilizes thin-film optical coatings and compact lens element designs that maintain high optical performance while minimizing the physical dimensions of each lens component. The use of optimized coating layers and thin-substrate lens elements reduces the overall height requirement while preserving image quality and optical efficiency.
3Adaptability or versatility
If the distance between the image sensor and imaging lens is adjusted to perform autofocus, then focusing capability is improved, but the overall size of the module increases
Solution Approach 1:
The patent implements a dynamic autofocus mechanism where the imaging lens is positioned on a movable support structure that can adjust its position relative to the image sensor along the optical axis. This dynamic positioning system enables focus adjustment without requiring a large linear travel distance, as the lens movement is achieved through a compact actuation mechanism that operates within a limited space envelope.
Solution Approach 2:
The patent transitions from a linear arrangement of lenses to a multi-dimensional compact structure. By utilizing vertical stacking and angular positioning of lens elements, the optical system achieves high optical efficiency without extending the horizontal length of the module. The lens elements are positioned in three-dimensional space to optimize both optical performance and compactness.
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 optical system achieves improved aberration characteristics and a slimmer structure, allowing for a more compact camera module design by blocking unnecessary light rays and reducing overall size.
Implementation Method 1
the second lens has positive refractive power, the third lens has negative refractive power
Data Source
AI summary
An optical system disclosed to an embodiment includes first to seventh lenses sequentially arranged along the optical axis from the object side to the image side, wherein the second lens has a positive refractive power, and the third lens has a negative refractive power, wherein the object-side and image-side surfaces of the second lens are convex, the image-side surface of the third lens is concave, and the first and third lenses satisfy the following equation 1: [Equation 1] 0.7<(SD L3S1)/(SD L1S1)<0.95 (in Equation 1, SD L1S1 means an effective radius of the object-side surface of the first lens, and SD L3S1 means an effective radius of the object-side surface of the third lens).