Six-Lens Optical Imaging Set with Merged Elements
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Solution Overview
Problem
Portable electronic devices face challenges in achieving good imaging quality with larger aperture stops and wider view angles due to flare issues caused by total reflection of light through the first three lens elements, as well as injection molding problems such as smaller thickness and crooked periphery curves of later lens elements, which affect spherical and chromatic aberration correction.
Innovation Solution
An optical imaging lens set with six lens elements, featuring a first lens with positive refractive power, a second lens with a concave image-side surface, no air gap between the third and fourth lenses, and aspherical surfaces on the fifth and sixth lenses, optimized with specific thickness and air gap ratios to minimize flare and improve optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture stop is enlarged and view angles are widened, then imaging quality is improved, but flare occurs due to total reflection of light through the first three lens elements
Solution Approach 1:
The patent eliminates air gaps between the third and fourth lens elements, converting the harmful total reflection at air interfaces into beneficial direct contact between lens elements. This eliminates the flare-causing total reflection while maintaining the enlarged aperture and wide view angle benefits
Solution Approach 2:
The patent merges the third and fourth lens elements by eliminating the air gap between them, creating direct optical contact. This merging eliminates the reflective interface that causes flare while preserving the optical functionality of both elements
2Length of moving object
If the thickness of the third and fourth lens elements is reduced, then device length is shortened, but injection molding problems occur such as smaller thickness and heavily crooked periphery curves
Solution Approach 1:
By eliminating the air gap and merging the third and fourth lens elements into direct contact, the patent effectively reduces the total length occupied by these elements while maintaining their individual thicknesses and manufacturing quality. The merged structure eliminates the need for precise air gap control while achieving compactness
3Length of moving object
If air gaps between lens elements are reduced, then total length is shortened, but flare increases due to total reflection
Solution Approach 1:
The patent specifically eliminates the air gap between the third and fourth lens elements, converting the harmful total reflection that would occur at this interface into beneficial direct optical contact. This selective elimination reduces total length while preventing flare at the critical interface
Solution Approach 2:
The patent applies different air gap conditions to different locations: maintaining air gaps between other lens elements while eliminating the air gap between the third and fourth lens elements. This local differentiation prevents flare at the critical interface while managing overall length
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 results in a shorter lens set with reduced air gaps, low flare, and improved optical performance, including better correction of spherical and chromatic aberrations, while maintaining a larger aperture and wider field of view.
Implementation Method 1
The optical imaging lens set exclusively has the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element with refractive power
Implementation Method 2
The second lens element has an image-side surface with a concave portion in a vicinity of the optical-axis
Data Source
AI summary
An optical-lens-set includes a first lens element of positive refractive power, a second lens element of an image surface with a concave portion near the optical-axis, no air gap between a third lens element and a fourth lens element, at least one of an object surface and an image surface of a fifth lens element being aspherical, both an object surface and an image surface of a sixth lens element being aspherical so that the total thickness ALT of all six lens element, the distance TL from an object surface of the first lens element to the image surface of the sixth lens element and total five air gaps AAG satisfy ALT/AAG≤4.5 or TL/AAG≤5.5.