Optical Imaging Lens Assembly with Targeted Spacers
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Solution Overview
Problem
Optical imaging lens assemblies with seven lenses suffer from severe internally-reflected stray light, which affects imaging quality.
Innovation Solution
The optical imaging lens assembly is designed with a specific arrangement of seven lenses and spacers, including a fourth and fifth spacer positioned between certain lenses, with controlled distances, curvature radii, and focal lengths to manage light refraction and block stray light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a seven-lens optical imaging lens assembly is designed to satisfy market requirements for wider pictures and richer details, then imaging performance is improved, but internal reflection occurs producing stray light that affects imaging quality
Solution Approach 1:
The patent introduces spacers as intermediary elements positioned between specific lenses (fourth and fifth lenses) to block and manage stray light paths. These spacers act as mediators that prevent harmful internal reflections while maintaining the seven-lens configuration needed for high imaging performance
Solution Approach 2:
The patent optimizes specific parameter relationships including the distance EP45 between spacers, center thickness CT5 of the fifth lens, curvature radii R8 and R9, and effective focal lengths f4 and f5. By controlling these parameters within specific ranges, the design reduces stray light while preserving imaging quality
2Object-generated harmful factors
If multiple spacers are added to block stray light between lenses, then stray light is reduced, but device complexity increases
Solution Approach 1:
The patent applies spacers locally only between the fourth and fifth lenses where stray light problems are most severe, rather than uniformly between all lenses. This targeted approach reduces stray light effectively while minimizing the increase in assembly complexity
Solution Approach 2:
The patent uses a selective number of spacers at critical positions rather than comprehensive coverage. By placing spacers only where most needed (between fourth and fifth lenses), the design achieves effective stray light control without excessive complexity
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
This design reduces stray light, ensures image height and final imaging quality, and improves assembly stability and miniaturization of the lens assembly.
Implementation Method 1
The seven lenses include, in sequence from an object side to an image side, a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power and a seventh lens having negative refractive power
Implementation Method 2
internal reflection is likely to occur on the optical imaging lens assembly with the seven-lenses. Internally-reflected light will produce stray light to affect imaging quality
Data Source
AI summary
Provided is an optical imaging lens assembly. The optical imaging lens assembly includes a lens barrel, seven lenses and a plurality of spacers, where the seven lenses include a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power and a seventh lens having negative refractive power, and an air gap is provided between every two adjacent lenses of the first lens to the seventh lens; the plurality of spacers include a fourth spacer and a fifth spacer; 1<EP45/CT5<4 is satisfied; 1<R8/R9<4 is satisfied; and 0<d4s/(f4−f5)<0.5 is satisfied.