Seven-Lens Camera Module Layout for Temperature-Stable Imaging
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Solution Overview
Problem
Existing camera modules for ADAS systems face challenges in maintaining consistent optical performance across varying temperature environments, particularly due to changes in optical characteristics when exposed to harsh conditions such as high or low temperatures, humidity, and moisture.
Innovation Solution
The optical system comprises a combination of lenses made from glass and plastic, arranged along an optical axis with specific refractive powers, focal lengths, and diameters, including cemented lenses, to compensate for refractive index changes with temperature fluctuations, ensuring stable optical properties across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera is exposed to harsh environments (high temperature, low temperature, moisture, high humidity), then the camera can operate in various automotive conditions, but the optical characteristics and aberration characteristics deteriorate and become non-uniform
Solution Approach 1:
The patent applies parameter changes by selecting specific refractive index values (1.505 < n < 1.750 for the first lens, 1.400 < n < 1.700 for the second lens) and focal length relationships (0.3 < |F1/F2| < 1.5) that remain stable across temperature variations. This ensures the optical system maintains consistent performance from -40°C to 105°C without requiring active adjustment mechanisms.
Solution Approach 2:
The patent uses composite material design by combining glass and plastic lenses with different thermal expansion coefficients and refractive index temperature dependencies. The first lens (positive power) and second lens (negative power) are made from materials with complementary thermal characteristics, allowing their combined optical power to remain stable across temperature ranges while compensating for individual material expansions and refractive index changes.
2Measurement precision
If multiple lenses are arranged to achieve high definition and high resolution, then imaging performance is improved, but the device complexity increases
Solution Approach 1:
The patent divides the optical system into functionally distinct segments: the first lens (positive refractive power) for primary light convergence and the second lens (negative refractive power) for aberration correction and field of view control. This segmentation allows each lens to be optimized independently for its specific function while maintaining overall system simplicity with only two main optical elements.
Solution Approach 2:
The patent applies local quality by giving each lens specific refractive index ranges and power characteristics tailored to its position and function in the optical path. The first lens uses higher refractive index materials (1.505 < n < 1.750) for strong convergence, while the second lens uses lower refractive index materials (1.400 < n < 1.700) for effective negative power with thinner profile, optimizing each region's contribution to overall image quality.
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 maintains improved MTF, aberration control, and resolution characteristics, providing excellent optical performance from -40°C to 105°C, while being cost-effective and lightweight, suitable for automotive applications.
Implementation Method 1
first to seventh lenses arranged along an optical axis wherein the first lens has a negative (−) refractive power, the composite refractive power of the second to seventh lenses is a positive (+) power
Implementation Method 2
The optical system may include a cemented lens in which a lens having a positive (+) refractive power and a lens having a negative (−) refractive power are cemented
Data Source
AI summary
An optical system according to an embodiment of the present invention includes first to seventh lenses arranged along an optical axis, wherein the first lens has a negative (−) refractive power, the composite refractive power of the second to seventh lenses is a positive (+) power, the second lens among the first to third lenses has a smallest effective diameter, and the effective diameter of the sixth and seventh lenses are smaller than the effective diameter of the fifth lens.