Nine-Lens Optical System Aberration Control
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Solution Overview
Problem
Existing camera modules face challenges in achieving high optical performance and compact size due to the complexity and size increase associated with multiple lenses, leading to issues with aberration and image stabilization.
Innovation Solution
An optical system comprising nine lenses with specific refractive powers and shapes, including a seventh lens with positive refractive power and a negative ninth lens, optimized to satisfy certain thickness and distance ratios, and an aperture stop configuration to improve optical characteristics and reduce the Total Track Length (TTL).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a plurality of imaging lenses are used to achieve high image quality and high resolution, then optical performance is improved, but the overall length and height of the camera module increase
Solution Approach 1:
The patent applies parameter changes by carefully controlling the refractive power, thickness, and spacing of each lens element. Specifically, it uses a combination of positive and negative refractive power lenses with optimized parameters (e.g., 0.3 < f7/f < 0.6, 0.5 < f8/f < 0.8) to achieve high optical performance while minimizing the overall optical path length and module height.
Solution Approach 2:
The patent employs composite lens design by combining multiple lens materials with different refractive indices and dispersion properties. This includes using both plastic and glass lens elements with specific refractive power ratios, allowing the system to correct various aberrations while maintaining a compact form factor through optimized material composition.
2Measurement precision
If the size of the image sensor is increased to realize high-resolution and high-definition, then image quality is improved, but the TTL of the optical system increases, thereby increasing the thickness
Solution Approach 1:
The patent controls the TTL by optimizing parameters of the optical system including the focal length of individual lenses (f1 through f9), their spacing, and refractive powers. The design satisfies specific parameter ranges (e.g., 0.3 < f7/f < 0.6, where f is the focal length of the entire optical system) to achieve high resolution with large image sensors while keeping the TTL and module thickness minimized.
3Measurement precision
If a plurality of lenses are included to improve optical efficiency, then image quality is improved, but the device complexity increases due to difficulty in deriving excellent optical properties and aberration control
Solution Approach 1:
The patent simplifies the complex optical design process by establishing specific parameter ranges and relationships that must be satisfied. Key parameters include the focal length ratios (0.3 < f7/f < 0.6, 0.5 < f8/f < 0.8), refractive power distributions, and spacing relationships between lenses. These parameter constraints provide a systematic approach to achieving excellent optical properties and aberration control without requiring overly complex design iterations.
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 optical performance with reduced size, enhancing resolution, chromatic aberration, and distortion control across the field of view, while maintaining a slim and compact structure.
Implementation Method 1
the first lens has positive (+) refractive power on the optical axis, and the seventh lens has a positive (+) refractive power on the optical axis, the ninth lens has a negative (−) refractive power on the optical axis
Implementation Method 2
the seventh lens may be a thickest among thicknesses of each of the first to ninth lenses in 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 from an object side toward a sensor side, the first lens has positive refractive power on the optical axis, and the seventh lens has a positive (+) refractive power on the optical axis, the ninth lens has a negative (−) refractive power on the optical axis, and the seventh lens may be a thickest among thicknesses of each of the first to ninth lenses in the optical axis.