Six-Lens Imaging Optics for Temperature-Stable Vehicle Camera Resolution
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Solution Overview
Problem
Small-sized surveillance cameras for vehicles experience significant resolution changes due to temperature fluctuations, necessitating high-resolution imaging capabilities under harsh temperature conditions.
Innovation Solution
An imaging lens system comprising specific lenses with refractive indices and temperature coefficients, including a stop and focus correction lenses, to maintain consistent optical performance across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional lenses are used in small-sized surveillance cameras, then the camera can be compact, but the resolution changes greatly according to temperature changes
Solution Approach 1:
The patent applies parameter changes by selecting lens materials with specific refractive index temperature coefficients (dn/dt). The lens system incorporates at least one lens with dn/dt ≥ 3×10^-6/°C and refractive index ≥ 1.8, which compensates for thermal expansion effects and maintains resolution stability across temperature ranges from -40°C to 80°C while keeping the camera compact.
Solution Approach 2:
The patent uses composite material principles by combining multiple lens elements with different thermal optical properties. The lens system includes lenses with varying refractive indices (≥1.7 and ≥1.8) and different dn/dt values, creating a composite optical system where the thermal characteristics of individual elements work together to maintain overall resolution stability despite temperature fluctuations.
2Measurement precision
If high-resolution imaging is achieved, then image quality improves, but optical performance becomes sensitive to temperature changes
Solution Approach 1:
The patent achieves temperature-insensitive high-resolution imaging by changing the optical parameters of the lens system. Specifically, it uses lenses with dn/dt ≥ 3×10^-6/°C and refractive index ≥ 1.8, which maintain consistent focal length and image quality across temperature changes, ensuring both high resolution and reliable optical performance from -40°C to 80°C.
Solution Approach 2:
The patent converts the harmful effect of temperature changes into a beneficial compensation mechanism. By selecting materials with positive dn/dt values (≥3×10^-6/°C), the lens system uses thermal-induced refractive index changes to counteract thermal expansion effects, thereby maintaining optical performance consistency and turning temperature sensitivity into a self-correcting feature.
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 system ensures constant optical performance from room temperature to extreme temperatures, enhancing imaging clarity and resolution in surveillance cameras.
Implementation Method 1
an imaging lens system includes a first lens, a second lens, a third lens having negative refractive power, a fourth lens, a fifth lens, and a sixth lens
Implementation Method 2
one or more of the first to sixth lenses has a refractive index of 1.8 or greater, and has a refractive index temperature coefficient (10−6/° C.) of 3 or greater
Data Source
AI summary
An imaging lens system includes a first lens, a second lens, a third lens having negative refractive power, a fourth lens, a fifth lens, and a sixth lens, disposed in order from an object side in a direction of an imaging plane, wherein one or more of the first to sixth lenses has a refractive index of 1.8 or greater, and has a refractive index temperature coefficient (10−6/° C.) of 3 or greater.