Camera Lens Assembly with Curved Image Plane
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Solution Overview
Problem
Current camera lens assemblies face challenges in achieving high imaging quality and miniaturization while effectively managing aberrations, particularly with the increasing demand for compact designs compatible with CCD and CMOS photosensitive elements.
Innovation Solution
A camera lens assembly is designed with a specific configuration that includes a first positive lens, a second negative lens, and subsequent lenses with varying refractive powers, featuring a curved image plane. This configuration ensures that the radius of curvature and total effective focal length satisfy specific ratios, optimizing the lens assembly's performance by controlling spherical aberrations, coma, and chromatic aberrations, and allowing for a compact, miniaturized design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve imaging quality and control aberrations, then the imaging performance is improved, but the device complexity and size increase
Solution Approach 1:
The lens assembly is divided into multiple lens groups with alternating positive and negative refractive powers. Each lens group performs specific optical functions, allowing complex aberration correction to be achieved through modular lens elements rather than a single complex lens, thus improving imaging quality while managing complexity through functional segmentation
Solution Approach 2:
Different lens elements are designed with specific local properties - positive lenses for focusing and negative lenses for aberration correction. Each lens position in the sequence serves a specific local function in the overall optical path, with the negative lens closest to the image plane specifically addressing field curvature and distortion, allowing precise control of imaging quality at different regions of the optical system
2Volume of moving object
If the lens assembly is miniaturized to reduce size, then the device compactness is improved, but the ability to control aberrations deteriorates
Solution Approach 1:
The image plane is designed with a specific curvature radius that matches the optical requirements of the miniaturized lens assembly. This curved image plane configuration allows the compact lens system to properly focus light rays from different field angles, maintaining aberration control despite the reduced size of the lens elements and shortened optical path
Solution Approach 2:
The patent specifies precise parameter ranges for the lens system including the curvature radius of the image plane and the alternating refractive powers of the lenses. By optimizing these parameters within specific ranges, the system achieves effective aberration control in a miniaturized configuration, where the curvature radius and focal lengths are carefully selected to balance compactness with optical performance
3Manufacturing precision
If the curvature radius of the image plane is adjusted to improve aberration control, then the imaging performance is improved, but the device complexity increases
Solution Approach 1:
The curved image plane configuration is integrated directly into the lens assembly structure, combining the image reception surface with the optical system. This merging eliminates the need for separate flat-to-curved conversion components or additional optical elements, achieving effective aberration control through the inherent curvature while maintaining a compact and simple overall device structure
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 solution effectively improves aberrations and maintains excellent imaging performance, enabling the lens assembly to achieve good imaging quality and compactness suitable for portable electronic devices.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power and at least one subsequent lens
Data Source
AI summary
The present disclosure discloses a camera lens assembly. The camera lens assembly includes, sequentially along an optical axis from an object side to an image side: a first lens having a positive refractive power, a second lens having a negative refractive power and at least one subsequent lens. A lens closest to the image side of the camera lens assembly is a negative lens having a negative refractive power, and a lens adjacent to the negative lens is a positive lens having a positive refractive power. The camera lens assembly further includes a curved image plane, and a radius of curvature RI of the image plane and a total effective focal length f of the camera lens assembly satisfy: |f/RI|≤0.35.