Six-Lens Optical Assembly Minimizing Total Track Length
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Solution Overview
Problem
Conventional optical image lens assemblies are too large to meet the demand for compact size in modern electronic devices, particularly when paired with high-sensitivity image sensors that require shorter back focal lengths.
Innovation Solution
An optical image lens assembly comprising six lens elements with specific refractive powers and surface curvatures, including aspheric surfaces, arranged to minimize the total track length and back focal length, with air spaces between adjacent lens elements to avoid the complexities of cemented lenses and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the total track length or back focal length is increased to provide a large field of view, then the field of view is improved, but the size of the optical image lens assembly becomes excessive
Solution Approach 1:
The optical system is divided into six separate lens elements with air spaces between them, allowing independent optimization of each element's refractive power and surface curvature to achieve a compact overall length while maintaining a wide field of view
Solution Approach 2:
Different regions of the lens elements have different surface curvatures (aspheric surfaces with different curvature radii in paraxial and off-axial regions), enabling localized control of light paths to expand the field of view without increasing the total track length
2Adaptability or versatility
If the back focal length is increased to match conventional optical image lens assemblies, then compatibility with traditional systems is improved, but the size requirement for compact electronic devices cannot be satisfied
Solution Approach 1:
The patent specifies precise parameter ranges for refractive powers, curvature radii, and axial distances that optimize the back focal length to be short (satisfying compact device requirements) while maintaining image quality and compatibility with high-sensitivity image sensors through controlled light path geometry
3Device complexity
If cemented lenses are used to reduce the number of air spaces, then the device complexity is reduced, but manufacturing precision requirements increase and image quality may deteriorate
Solution Approach 1:
The patent deliberately maintains air spaces between all six lens elements, avoiding the need for precision cementing operations. This segmentation approach simplifies manufacturing by allowing independent adjustment and assembly of each lens element while maintaining or improving image quality through optimized air space distances
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 enables a compact optical image lens assembly that effectively captures images with improved resolution and light gathering capabilities, suitable for compact electronic devices while maintaining image quality and reducing manufacturing complexity.
Implementation Method 1
an optical image lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element
Data Source
AI summary
An optical image lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with negative refractive power has an image-side surface being concave. The second lens element has an object-side surface being convex. The third lens element has positive refractive power. The fourth lens element with negative refractive power has an image-side surface being concave. The fifth lens element with positive refractive power has an image-side surface being convex. The sixth lens element with negative refractive power has an object-side surface being concave and an image-side surface being concave and the image-side surface of the sixth lens element includes at least one convex shape in an off-axial region thereof.