Six-Lens Optical Imaging System Compact Design
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Solution Overview
Problem
Current optical imaging lens sets for portable electronic devices are too bulky due to their length, compromising their suitability for small-sized devices while attempting to maintain image quality.
Innovation Solution
A six-lens element optical imaging lens set with specific refractive power distributions and air gap configurations, including a first lens with negative power, a second lens with convex peripheral surfaces, and a sixth lens with a concave peripheral surface, optimized to reduce overall length while maintaining high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more lens elements are used to improve image quality, then optical performance is improved, but system length increases making it unsuitable for small portable devices
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across lens elements, controlling air gap dimensions, and specifying surface curvature parameters to achieve compact design. The sixth lens element's concave peripheral surface and specific air gap ratios (Ltt/G23≤20.0, Tall/G23≤10.0) enable reduced system length while maintaining image quality through precise parameter control.
Solution Approach 2:
The patent makes each lens element serve multiple functions: the second and third lens elements with convex peripheral surfaces correct off-axis aberrations, the fifth lens element with convex image-side surface controls spherical aberration, and the sixth lens element with concave peripheral surface addresses both distortion and field curvature. This multi-functional design reduces the need for additional dedicated correction elements.
2Length of stationary object
If lens elements are made thinner to reduce system length, then compactness is improved, but manufacturing precision and optical performance deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges to balance thinness with manufacturability: Ltt/T5≤11.0 ensures the fifth lens element is thin enough for compactness while maintaining sufficient thickness for manufacturing precision. The air gap control (Ltt/G23≤20.0) provides manufacturing tolerance buffer, and the concave peripheral surface design of the sixth element compensates for thickness reduction effects on 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 solution achieves a compact lens set design with improved optical performance, reducing the system length to less than 13 mm while maintaining excellent image quality and aberration control, suitable for small-sized portable electronic devices.
Implementation Method 1
The first lens element has negative refractive power. The second lens element has a second object-side surface with a convex portion in a vicinity of its circular periphery. The third lens element has a third object-side surface with a convex portion in a vicinity of its circular periphery. The fourth lens element has refractive power. The fifth lens element has a fifth image-side surface with a convex portion in a vicinity of the optical axis. The sixth lens element has a sixth object-side surface with a concave portion in a vicinity of its circular periphery.
Data Source
AI summary
An optical imaging lens set includes a first lens element to a sixth lens element from an object side toward an image side along an optical axis. The first lens element has negative refractive power. The second lens element has an object-side surface with a convex portion in a vicinity of periphery. The third lens element has an object-side surface with a convex portion in a vicinity of periphery. The fifth lens element has an image-side surface with a convex portion in a vicinity of the optical axis. The sixth lens element has an object-side surface with a concave portion in a vicinity of its periphery.