10-Lens Optical System Slim Camera Module Design
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Solution Overview
Problem
Existing camera modules face challenges in achieving excellent optical properties and a slim structure due to the complexity and size increase when using multiple lenses, which affects image quality and device thickness.
Innovation Solution
An optical system comprising first to tenth lenses with specific refractive powers and surface shapes, including a first lens with positive refractive power and a tenth lens with negative refractive power, optimized to minimize total track length and maximize effective diameters, ensuring improved optical 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 lenses is used to improve optical performance, then image quality and resolution are improved, but the overall length and thickness of the camera module increase
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group with positive refractive power and second lens group with negative refractive power) that can be positioned at different locations along the optical axis. This segmentation allows each group to contribute to optical performance while enabling compact arrangement that reduces overall length
Solution Approach 2:
The patent arranges lenses with different refractive powers in a nested configuration where the first lens group and second lens group are positioned to overlap or closely follow each other along the optical axis, maximizing space utilization and minimizing the total track length of the optical system
2Measurement precision
If the size of the image sensor is increased to realize high-resolution, then image quality is improved, but the TTL (Total Track Length) of the optical system increases, thereby increasing the thickness
Solution Approach 1:
The patent optimizes the refractive powers, focal lengths, and spacing parameters of the lens groups to achieve a compact TTL that accommodates larger image sensors. By carefully selecting and adjusting these optical parameters, the system maintains high-resolution capability while minimizing the distance from the first lens to the image sensor
3Measurement precision
If multiple lenses with positive and negative refractive powers are used to improve optical efficiency, then image quality is improved, but the device complexity and difficulty of deriving excellent optical properties increase
Solution Approach 1:
The patent assigns specific local qualities to different lens groups: the first lens group has positive refractive power optimized for certain optical functions while the second lens group has negative refractive power optimized for other functions. This local differentiation allows each group to be designed and optimized independently, simplifying the overall design process while achieving excellent optical properties
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, enabling a slim and compact camera module with enhanced optical performance across the entire field of view.
Implementation Method 1
the first lens has positive (+) refractive power on the optical axis
Implementation Method 2
the tenth lens has negative (−) refractive power on the optical axis
Data Source
AI summary
The optical system disclosed in the embodiment includes first to tenth lenses disposed along the optical axis from the object side toward the sensor side, the first lens has positive refractive power on the optical axis, and the tenth lens has negative refractive power on the optical axis, the object-side surface of the first lens has a convex shape on the optical axis, a sensor-side surface of the third lens has a smallest effective diameter among the first to tenth lenses, a sensor-side surface of the tenth lens has a maximum effective diameter among the first to tenth lenses, the sensor-side surface of the tenth lens is provided without a critical point from the optical axis to an end of an effective region, a distance from a center of the sensor-side surface of the tenth lens to a first point where a slope of a straight line passing through the sensor-side surface is less than −1 is 10% or more of an effective radius, and satisfies the following equation: 0.4<TTL/ImgH<2.5 (TTL (Total track length) is a distance in the optical axis from an apex of the object-side surface of the first lens to an image surface of an image sensor, and ImgH is ½ of a maximum diagonal length of the image sensor.).