Eight-Lens Imaging System for Temperature-Stable Resolution
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Solution Overview
Problem
Existing surveillance cameras, particularly those used in autonomous driving systems, face challenges in maintaining high resolution and constant optical performance across varying temperature conditions, typically ranging from -40°C to 80°C.
Innovation Solution
The proposed imaging lens system consists of eight sequentially arranged lenses, including a first lens with a concave image-side surface, a seventh lens with a convex image-side surface, and an eighth lens with positive refractive power. This configuration satisfies specific conditional expressions to maintain optical performance across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If early small surveillance cameras were designed to capture adjacent obstacles, then device complexity was reduced, but manufacturing precision and optical performance deteriorated with high resolution requirements and large temperature variations
Solution Approach 1:
The imaging lens system is divided into eight individual lens elements with specific configurations (convex/concave surfaces) arranged in sequence. Each lens element contributes to correcting optical aberrations and maintaining focus stability, allowing the system to achieve high manufacturing precision without excessive overall complexity.
Solution Approach 2:
The patent specifies precise parameter ranges for the lens system including focal length ratios (f2/f3, f4/f3, f5/f3, f6/f3, f7/f3, f8/f3) and conditional expressions that must be satisfied. These parameter constraints ensure optimal optical performance and temperature compensation while maintaining manageable device complexity.
2Measurement precision
If resolution was increased for autonomous driving functions, then measurement precision improved, but stability of optical characteristics deteriorated under temperature changes from -40 to 80°C
Solution Approach 1:
The lens system uses specifically controlled parameter ranges and satisfies conditional expressions related to focal length ratios to maintain stable optical characteristics across extreme temperature variations while achieving high measurement precision for autonomous driving applications.
Solution Approach 2:
The imaging lens system employs a composite structure with eight different lens elements, each with specific convex/concave surface configurations and refractive properties. This composite design enables the system to maintain stable optical characteristics across temperature changes while achieving high resolution.
3Device complexity
If lens system was simplified for adjacent obstacle capture, then device complexity reduced, but focus stability deteriorated under rapid temperature deviation
Solution Approach 1:
The lens system is segmented into eight distinct elements with specific surface configurations, allowing each element to contribute to focus stability while maintaining manageable overall complexity for adjacent obstacle capture applications.
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 imaging lens system achieves high resolution and minimizes focus changes due to temperature deviations, ensuring consistent optical performance within the extreme temperature range of -40°C to 80°C.
Implementation Method 1
an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, sequentially arranged from an object side
Implementation Method 2
the lens barrel may have a first coefficient of thermal expansion and the housing may have a second coefficient of thermal expansion different from the first coefficient of thermal expansion
Implementation Method 3
L1DTn is a rate of change in refractive index according to a change in temperature of the first lens, L4DTn is a rate of change in refractive index according to a change in temperature of the fourth lens
Data Source
AI summary
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, sequentially arranged from an object side. The seventh lens has a convex image-side surface, the eighth lens has positive refractive power, and the imaging lens system satisfies the following conditional expression: 1.10<f3/f<1.40, where f is a focal length of the imaging lens system, and f3 is a focal length of the third lens.