Nine-Lens Meniscus Optical System for Compact 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 the thickness, distance, and size of multiple lenses, which in turn increases the overall size of the module and image sensor, compromising optical properties and aberration characteristics.
Innovation Solution
An optical system comprising first to ninth lenses with specific refractive powers, shapes, and critical points, along with a first lens group having positive refractive power and a second lens group with negative refractive power, optimized to achieve improved optical properties and a slim structure.
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 within the lens assembly structure, specifically between the image sensor and the last lens, allowing the filter to be integrated into the existing optical path without requiring additional external space. This nested arrangement enables the filter to perform its function while maintaining the compact overall dimensions of the camera module.
Solution Approach 2:
The patent utilizes the optical axis dimension efficiently by positioning the optical filter in the optical path between the lens group and image sensor. This dimensional arrangement allows the filter to be incorporated along the existing optical trajectory without increasing the lateral dimensions or requiring additional depth beyond what is already allocated for the optical components.
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 changes the optical parameters by introducing an optical filter with specific refractive index and optical properties that allows it to manipulate light transmission in a way that reduces the effective optical path length. This parameter change enables the system to maintain high image definition with a larger sensor while controlling the TTL and thickness through optimized optical design.
3Reliability
If multiple lenses are used to improve optical properties, then aberration characteristics are improved, but the distance and size between lenses increase the module size
Solution Approach 1:
The patent extracts the optical filtering function from a separate component and integrates it into the lens assembly structure. By taking out the filter and positioning it within the existing optical path between the lens group and image sensor, the system achieves improved aberration characteristics without adding significant volume or requiring increased spacing between optical elements.
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 enhances aberration characteristics and resolving power, providing good optical performance at the center and periphery of the field of view while maintaining a compact structure.
Implementation Method 1
the first lens and the third lens have different refractive powers on the optical axis, the first to third lenses have a meniscus shape convex toward the object side 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 an object side to a sensor side, wherein the first lens and the third lens have different refractive powers on the optical axis, the first to third lenses have a meniscus shape convex toward the object side on the optical axis, an object-side surfaces of each of the eighth lens and the ninth lens have a convex shape on the optical axis, and the following Equations may satisfy: 0.5<ΣCT/ΣCG<3 and 0<CT_Max/CG_Max<2 (ΣCT is a sum of a center thicknesses of the first to ninth lenses, ΣCG is a sum of optical axis distances between the first to ninth lenses, CT_Max is a maximum of the center thicknesses of each lens, and CG_Max is a maximum of the optical axis distances).