Seven-Lens Optical Camera Lens Assembly for Stray Light Blocking
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Solution Overview
Problem
The issue of serious stray light in ultra-wide-angle and miniaturized optical camera lens assemblies for smartphones affects imaging quality.
Innovation Solution
An optical camera lens assembly with seven lenses and spacing pieces is designed, where the lenses and spacing pieces are arranged to control the field-of-view and lens barrel height, ensuring ultra-wide-angle and miniaturization while reducing stray light by controlling the spacing, focal lengths, and diameters of the first lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the optical camera lens assembly is designed for ultra-wide angle and miniaturization, then the field-of-view is widened and the lens barrel height is reduced, but stray light becomes serious
Solution Approach 1:
The patent introduces a first spacing piece as an intermediary component positioned between the first lens and the second lens. This spacing piece includes a light blocking structure that actively intercepts and blocks stray light before it can reach the image sensor. The light blocking structure acts as a mediator that selectively blocks harmful stray light while allowing useful imaging light to pass through, thereby resolving the contradiction between ultra-wide angle coverage and stray light reduction.
Solution Approach 2:
The first spacing piece is designed with specific local geometric characteristics including an inner diameter d1s and outer diameter D1s that are optimized to match the optical path requirements. The spacing piece is positioned at a specific location (with spacing distance EP01 from the object-side end surface) and has specific dimensional relationships (−2.501*D1s/(f1*DT12) ≤ EP01/d1s ≤ −1.501*D1s/(f1*DT12)) that create local light blocking zones precisely where stray light problems occur, without affecting the overall ultra-wide angle performance.
2Length of stationary object
If the lens barrel height is reduced for miniaturization, then the device size is reduced, but stray light control becomes more difficult
Solution Approach 1:
The patent addresses the stray light control problem in the limited axial space by introducing radial dimension controls through the spacing piece's inner and outer diameters. The light blocking structure extends in the radial direction to intercept stray light paths that would otherwise bounce between lens surfaces. By utilizing the radial dimension (d1s and D1s) rather than only the axial dimension, the design effectively controls stray light within the constrained lens barrel height L.
Solution Approach 2:
The patent employs specific parameter relationships to control stray light in the miniaturized design. The conditional expression −2.501*D1s/(f1*DT12) ≤ EP01/d1s ≤ −1.501*D1s/(f1*DT12) establishes precise dimensional relationships between the spacing piece parameters (EP01, d1s, D1s) and optical parameters (f1, DT12). By carefully controlling these parameters, the design achieves effective stray light blocking within the reduced lens barrel height while maintaining ultra-wide angle 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 design effectively blocks excess light, reducing stray light and improving imaging quality by maintaining a reasonable thin-to-thickness ratio and regulating the optical path.
Implementation Method 1
the first spacing piece is positioned between the first lens and the second lens and is in partial contact with an image-side surface of the first lens
Implementation Method 2
the seven lenses sequentially comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side
Data Source
AI summary
An optical camera lens assembly is provided. An implementation of the optical camera lens assembly may comprise a lens barrel, seven lenses and at least one spacing piece. The the at least one spacing piece comprises a first spacing piece. Half of a maximal field-of-view Semi-FOV of the optical camera lens assembly and a maximal height L of the lens barrel satisfy: 0.5<TAN(Semi-FOV)/L<0.8. A spacing distance EP01 between an object-side end surface of the lens barrel and the first spacing piece, an outer diameter D1s of an object-side surface of the first spacing piece, an effective focal length f1 of the first lens, and a maximal effective radius DT12 of an image-side surface of the first lens satisfy: −2.5<EP01*D1s/(f1*DT12)<−1.0.