Ninth-Lens Optical System for Slim Camera Module Design
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Solution Overview
Problem
Current camera modules face challenges in achieving excellent optical performance and a slim structure due to the complexity and size increase when using multiple lenses, which affects image quality and resolution, especially at the periphery of the field of view.
Innovation Solution
An optical system comprising first to ninth lenses with specific refractive powers and shapes, including meniscus lenses, where the thickness and distance relationships between lenses are optimized to improve optical properties and reduce overall size, ensuring good performance at both the center and periphery of the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a plurality of imaging lenses with positive and/or negative refractive power is used to improve image quality and resolution, then optical performance is improved, but the overall length and height of the camera module increase due to the thickness and intervals of multiple lenses
Solution Approach 1:
The patent employs a nested lens configuration where multiple lenses with different refractive powers are arranged in a compact sequence. The first lens (positive power) and second lens (negative power) are positioned close together, with subsequent lenses nested in a way that minimizes overall length. This nesting approach allows multiple optical elements to be packed efficiently, achieving high resolution without proportionally increasing module length.
Solution Approach 2:
The patent optimizes specific parameters including the refractive powers of individual lenses, the thickness of each lens element, and the intervals between lenses. By carefully controlling these parameters—such as setting the first lens with positive refractive power and the second lens with negative refractive power, and optimizing their respective thicknesses and spacing—the system achieves excellent optical performance while maintaining a compact form factor.
2Measurement precision
If the size of the image sensor is increased to realize high-resolution and high-definition imaging, then image quality is improved, but the TTL (Total Track Length) of the optical system increases, thereby increasing the thickness of the camera module
Solution Approach 1:
The patent optimizes the TTL by carefully controlling the refractive powers and thicknesses of the lens elements. The first lens has positive refractive power with optimized thickness, and the second lens has negative refractive power with controlled thickness. By adjusting these parameters and minimizing the interval between lenses, the system achieves high-definition imaging capability while keeping the Total Track Length short, thus maintaining a thin camera module profile.
Solution Approach 2:
The patent uses a combination of positive and negative refractive power lenses in a compact arrangement. The first lens (positive power) and second lens (negative power) work together to provide the necessary optical correction and focusing capability for high-resolution imaging, while their combined thickness and spacing are optimized to minimize TTL. This partial use of multiple lens types achieves the required optical performance without the full complexity of traditional multi-element designs.
3Measurement precision
If a plurality of lenses is included to improve optical properties, then image quality is improved, but it becomes difficult to derive excellent optical properties and aberration properties due to system complexity
Solution Approach 1:
The patent achieves excellent optical properties by optimizing the refractive powers of individual lenses. The first lens is designed with positive refractive power and the second lens with negative refractive power, with specific thickness ratios and spacing. By carefully controlling these parameters, the system corrects aberrations effectively without requiring a large number of lens elements, thus maintaining relatively simple system complexity while achieving superior optical performance.
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 resolution, distortion, and aberration characteristics, allowing for a slim and compact camera module structure with enhanced optical performance across the entire field of view.
Implementation Method 1
first to ninth lenses disposed along an optical axis... the first lens has a positive (+) refractive power on the optical axis, the second lens has positive (+) refractive power on the optical axis, the third lens has negative (−) refractive power on the optical axis
Data Source
AI summary
The optical system disclosed in the embodiment of the invention includes first to ninth lenses disposed along an optical axis in a direction from the object side to the sensor side, wherein the first and second lenses have positive (+) refractive power on the optical axis, the third lens and the ninth lens has a negative refractive power on the optical axis, the fifth lens has a meniscus shape convex from the optical axis toward the sensor, L1_CT is a thickness of the first lens on the optical axis, and L3_CT is a thickness of the third lens on the optical axis, and the following Equation may satisfy: Equation: 2<L1_CT/L3_CT<4.