Eleven-Lens Optical System with Meniscus Layout for Compact Modules
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Solution Overview
Problem
Existing camera modules face challenges in achieving high optical performance with multiple lenses, leading to increased size and thickness due to aberration properties and the need for a slim structure.
Innovation Solution
An optical system comprising first to eleventh lenses with specific refractive indices, meniscus shapes, and surface configurations, along with a first and second lens group arrangement, to enhance optical properties and reduce overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a plurality of lenses is included 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 patent applies nesting by placing the optical filter inside the lens barrel structure, specifically between the lens groups and the image sensor. This allows the filter to be integrated within the existing optical path without requiring additional external space, thereby maintaining compact overall dimensions while incorporating multiple functional elements (lenses and filter) in a nested arrangement.
Solution Approach 2:
The patent utilizes the radial dimension by arranging lenses with different effective diameters in sequence along the optical axis. The lens effective diameters are designed to gradually decrease from the object side toward the sensor side, allowing light rays to be efficiently guided through the optical system without increasing the axial length. This dimensional optimization enables compact design while maintaining optical performance.
2Measurement precision
If the size of the image sensor is increased to realize high-resolution, then image definition is improved, but the TTL of the optical system increases, thereby increasing the thickness
Solution Approach 1:
The patent optimizes the optical parameters of the lens system, specifically designing the effective diameters of the lenses to gradually decrease from the object side toward the sensor side. This parameter optimization allows the optical system to accommodate larger image sensors while controlling the TTL within acceptable limits, thereby achieving high-resolution imaging without excessive thickness increase.
3Reliability
If multiple lenses are used to improve optical properties, then aberration control is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific functional characteristics to different lens elements and the optical filter at specific locations within the optical system. Each lens group and the optical filter are positioned and designed with specific properties (such as decreasing effective diameters and specific refractive indices) to address local optical requirements, thereby achieving overall aberration control through localized optimization rather than uniform design.
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 system achieves improved aberration characteristics, resolving power, and distortion control, enabling a slim and compact camera module design.
Implementation Method 1
an optical system comprising first to eleventh lenses disposed along an optical axis in a direction from an object side to a sensor side, wherein the first lens has positive (+) refractive power on the optical axis
Data Source
AI summary
The optical system disclosed in the embodiment of the invention includes first to eleventh lenses disposed along an optical axis in a direction from an object side to a sensor side, wherein the first lens has positive (+) refractive power on the optical axis and has a convex object-side surface, and a refractive index n3 of the third lens and a refractive index n4 of the fourth lens satisfy the following Equation: 1<n3/n4<1.5, a number of meniscus-shaped lenses convex toward the object side on the optical axis OA of the first to eleventh lenses is four or more, a sensor-side surface of the eleventh lens is provided without a critical point from the optical axis to an end of an effective region, and a maximum distance from the optical axis to a point where a height between a straight line orthogonal to the optical axis and the sensor-side surface is less than 0.1 is a first distance, and the first distance may be disposed at a position of 20% or more of an effective radius of the sensor-side surface of the eleventh lens.