Nested Ten-Lens Optical System for Slim Camera 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 issues and the need for a slim structure.
Innovation Solution
An optical system comprising first to tenth lenses with specific refractive indices, shapes, and critical points, including meniscus-shaped lenses, to improve optical properties and reduce overall length, with a first lens group having positive refractive power and a second lens group having negative refractive power, optimizing focal lengths and distances between lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a plurality of lenses is included to improve optical performance, then optical properties are improved, but the overall length and height increase
Solution Approach 1:
The patent implements a nested structure where the third lens is positioned within the aperture stop, and the fourth lens is positioned within the fifth lens, creating a compact nested arrangement that reduces the overall length of the optical system while maintaining multiple lens elements for improved optical performance
Solution Approach 2:
The patent transitions from a conventional linear arrangement of lenses along the optical axis to a two-dimensional arrangement where lenses are positioned at different radial distances from the optical axis, with the third lens having a first radial distance and the fourth lens having a second radial distance, thereby reducing the overall length while maintaining optical performance
2Measurement precision
If the size of the image sensor is increased to realize high-resolution, then resolution is improved, but the TTL of the optical system increases
Solution Approach 1:
The patent employs movable lens elements that can adjust their positions along the optical axis, allowing the optical system to dynamically adapt to different focal lengths and image sensor sizes, thereby maintaining high resolution while minimizing the TTL for compact camera modules
Solution Approach 2:
The patent optimizes the refractive indices and curvatures of the lens elements, with specific refractive index relationships between lenses, to reduce the TTL while maintaining the ability to support high-resolution image sensors through parameter optimization rather than physical size increase
3Manufacturing precision
If a plurality of lenses is included to improve optical performance, then aberration properties are improved, but the overall size of the module increases
Solution Approach 1:
The patent implements a nested structure where the third lens is positioned within the aperture stop, and the fourth lens is positioned within the fifth lens, creating a compact nested arrangement that reduces the overall volume of the optical module while maintaining multiple lens elements for improved aberration control
Solution Approach 2:
The patent transitions from a conventional linear arrangement of lenses along the optical axis to a two-dimensional arrangement where lenses are positioned at different radial distances from the optical axis, with the third lens having a first radial distance and the fourth lens having a second radial distance, thereby reducing the overall volume while maintaining 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 aberration characteristics, resolving power, and reduced thickness, enabling a slim and compact camera module with enhanced optical performance at the center and periphery of the field of view.
Implementation Method 1
an imaging lens for forming an image, and an image sensor for converting the formed image into an electrical signal
Data Source
AI summary
The optical system disclosed in the embodiment of the invention includes first to tenth lenses disposed along an optical axis in a direction from an object side to a sensor side, wherein the first lens has a positive (+) refractive power, and a shape in which an object-side surface is convex, 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 among the first to tenth lenses is four or more, a sensor-side surface of the ninth lens has a critical point, an object-side surface of the tenth lens has a critical point, and the critical point of the object-side surface of the tenth lens may be disposed closer to the optical axis than the critical point of the sensor-side surface of the ninth lens.