Five-Lens Optical Imaging Assembly for Compact Mobile Camera Modules
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Solution Overview
Problem
The increasing demand for full-screen mobile phones has limited the mounting space for front-facing cameras, necessitating a miniature optical imaging lens assembly with high manufacturability and image quality.
Innovation Solution
An optical imaging lens assembly comprising five lenses with specific refractive powers and surface types, carefully configured to achieve a small head size, high manufacturability, and high image quality, including a first lens with positive refractive power, a second lens with negative refractive power, and a third to fifth lens with varying refractive powers, optimized for a compact design and improved imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the mounting space is reduced to accommodate full-screen design, then the screen area is increased, but the available space for camera components is reduced
Solution Approach 1:
The patent implements nesting by placing the infrared filter within the housing of the fifth lens, and positioning the optical filter between the fifth lens and imaging surface. This nested arrangement allows multiple optical components to occupy the same spatial envelope, effectively reducing the overall volume of the camera module while maintaining all necessary functional elements.
Solution Approach 2:
The patent utilizes the optical axis dimension efficiently by arranging five lenses in sequence along the optical path, with each lens contributing to image formation. By optimizing the spacing and focal lengths along this one-dimensional arrangement, the design achieves compact volume while maintaining imaging performance.
2Volume of moving object
If the lens assembly is miniaturized to fit limited space, then the volume is reduced, but the image quality may deteriorate
Solution Approach 1:
The patent employs aspheric surfaces for all five lenses, characterized by conic coefficients and higher-order terms (A4, A6, A8, A10, A12) that precisely control light ray paths. By optimizing these mathematical parameters, the design corrects spherical aberration, coma, and other optical distortions that would otherwise degrade image quality in a compact configuration.
Solution Approach 2:
Different lens elements have different refractive indices and Abbe numbers tailored to their specific positions in the optical train. The first lens uses material with n=1.555 and v=56.1, while the second lens uses n=1.682 and v=19.2, allowing each component to address specific aberration types locally rather than requiring uniform high-performance materials throughout.
3Manufacturing precision
If more lenses are added to improve image quality, then the imaging performance is enhanced, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the five-lens assembly: image formation, chromatic aberration correction, spherical aberration correction, and field curvature compensation are all achieved within this unified structure. The infrared and optical filters are integrated into the lens housing rather than being separate components, further reducing overall complexity.
4Manufacturing precision
If the focal length is increased to improve imaging, then the image quality is enhanced, but the head size increases
Solution Approach 1:
The patent uses a total effective focal length of 3.76mm with a TTL of 4.35mm, achieving a compact focal length ratio. The aspheric surface parameters and lens spacing are optimized to maintain high imaging quality at this reduced focal length, avoiding the need for longer optical paths that would increase head size.
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 assembly achieves a small head size, high manufacturability, and high image quality, suitable for miniaturized photographic devices, while maintaining a large field of view and reducing aberrations, making it suitable for portable electronic products.
Implementation Method 1
a first lens with a positive refractive power, an object-side surface thereof may be a convex surface, and an image-side surface thereof be a concave surface
Implementation Method 2
a second lens with a negative refractive power
Implementation Method 3
a fifth lens with a negative refractive power, an object-side surface of the fifth lens may be a convex surface, and an image-side surface of the fifth lens be a concave surface
Data Source
AI summary
The disclosure provides an optical imaging lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens with a positive refractive power, an object-side surface thereof is a convex surface, and an image-side surface thereof is a concave surface; a second lens with a negative refractive power; a third lens with a refractive power; a fourth lens with a positive refractive power; and a fifth lens with a negative refractive power; VP is an on-axis distance from an intersection point of a straight line where a marginal ray of the optical imaging lens assembly is located and the optical axis to the object-side surface of the first lens, and VP satisfies 0 mm<VP<1.5 mm.