Seventh Lens Optical System Temperature Compensation
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Solution Overview
Problem
Existing optical systems for camera modules in vehicles face challenges in maintaining consistent optical characteristics across varying temperature ranges, leading to difficulties in achieving high image quality and resolution.
Innovation Solution
The optical system comprises a series of lenses, including a first glass lens with negative refractive power and subsequent lenses with positive composite refractive power, where at least two lenses adjacent to the image sensor are made of plastic material. This configuration helps maintain optical performance by compensating for changes in refractive index due to temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera is exposed to harsh environments outside or inside the vehicle, then the camera can operate in various temperature ranges, but the optical characteristics and aberration characteristics become non-uniform and difficult to control
Solution Approach 1:
The patent applies parameter changes by selecting specific glass materials with different thermal expansion coefficients and refractive index temperature dependencies for each lens element. The glass composition parameters (SiO2, Al2O3, B2O3, PbO, BaO, La2O3 contents) are precisely controlled to achieve temperature compensation, where the optical characteristics remain uniform across -20°C to 105°C operating range
Solution Approach 2:
The patent uses composite materials by combining multiple glass types (LBS, LAC, LASF, LaF) with different thermal and optical properties in a single optical system. Each glass type contributes specific characteristics that, when combined, create an overall system that is insensitive to temperature variations, resolving the contradiction between environmental adaptability and optical uniformity
2Manufacturing precision
If research is conducted on an optical system including a plurality of lenses to achieve high image quality and high resolution, then image quality and resolution are improved, but the characteristics of the optical system change when exposed to harsh environments
Solution Approach 1:
The patent applies local quality by assigning different glass material properties to different lens elements based on their specific positions and functions in the optical system. Each lens element is optimized with particular glass composition ratios tailored to its local optical requirements while contributing to overall temperature stability
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the refractive index and dispersion parameters of each glass element to compensate for temperature-induced optical characteristic changes, maintaining stable image quality and resolution across varying temperatures
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 optical system effectively maintains improved optical characteristics, including MTF, aberration control, and resolution, across a wide temperature range from -20°C to 105°C, ensuring consistent performance in harsh environments.
Implementation Method 1
first to seventh lenses aligned along an optical axis from an object toward a sensor side, wherein a refractive power of the first lens is negative, a composite refractive power of the second lens to the seventh lens is positive
Implementation Method 2
at least one of the sixth lens and the seventh lens is formed of a plastic material... compensating for changes in refractive index due to temperature variations
Data Source
AI summary
The optical system disclosed in an embodiment of the invention includes an image sensor; and first to seventh lenses aligned along an optical axis from the object toward the sensor, wherein a refractive power of the first lens is negative, and a composite refractive power of the second lens to the seventh lens is positive, at least one of the sixth lens and the seventh lens is made of a plastic material, each of the first to seventh lenses has an object-side surface and a sensor-side surface, and a difference between the effective diameters of the object-side surface and the sensor-side surface of the fifth lens may be the greatest among the differences between the effective diameters of the object-side surface and the sensor-side surface of each of the first to seventh lenses.