Optical Lens Thermal Compensation for Focal Stability
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Solution Overview
Problem
Conventional optical image capturing systems for electronic devices lack temperature compensation, leading to focal length deviations due to temperature fluctuations, which reduces imaging quality, especially in extreme environments.
Innovation Solution
The use of optical lenses made from materials with a temperature refractive index coefficient (dn/dt) less than or equal to zero and suitable thermal expansion coefficients for positioning elements, ensuring the optical image capturing system maintains focal length stability across a temperature range of −50° C. to 100° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional non-temperature-compensated materials are used for lenses and positioning elements, then the device complexity is reduced and manufacturing is easier, but the focal length stability deteriorates under temperature fluctuations
Solution Approach 1:
The patent applies parameter changes by selecting materials with specific thermal properties (dn/dt ≤ 0 for lenses and matched thermal expansion coefficients for positioning elements). This changes the physical parameters of the materials to compensate for thermal effects, maintaining focal length stability under temperature variations without adding complex active control mechanisms
Solution Approach 2:
The patent uses composite material strategy by combining lenses made from materials with negative or zero temperature refractive index coefficients (such as certain glass types) with positioning elements made from materials having suitable thermal expansion coefficients. This composite approach creates a thermally compensated optical system where the material properties work together to maintain focal length stability
2Reliability
If materials with temperature refractive index coefficient ≤ 0 are used for lenses, then focal length stability under temperature fluctuation is improved, but the ease of manufacture decreases
Solution Approach 1:
The patent changes the material parameter (refractive index temperature coefficient) to achieve thermal compensation. By selecting materials with dn/dt ≤ 0, the system compensates for thermal expansion effects, maintaining focal length stability. While these materials may be more difficult to manufacture, the principle accepts this trade-off to achieve the reliability goal
3Manufacturing precision
If positioning elements are made from materials with suitable thermal expansion coefficients, then the imaging quality under extreme temperatures is improved, but the device complexity increases
Solution Approach 1:
The patent changes the thermal expansion coefficient parameter of positioning element materials to match or compensate for the thermal behavior of the optical components. This ensures that the positioning structure expands or contracts in harmony with the optical elements, maintaining imaging precision under temperature variations without adding complex active positioning control
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 solution effectively compensates for thermal expansion, maintaining image quality and focal length accuracy even in extreme temperatures, enhancing the system's weatherability and performance.
Implementation Method 1
material, which has a temperature refractive index coefficient (dn/dt) relative to air being lower than or equal to zero in a temperature range of −50° C. to 100° C.
Implementation Method 2
material, which has a temperature refractive index coefficient (dn/dt) relative to air being lower than or equal to zero
Data Source
AI summary
An optical image capturing system and an electronic using the same are disclosed. The optical image capturing system includes at least two lenses, an image plane, and a first position element. In certain condition, the design of the optical image capturing system may simantaneously inhibit the deviation of effect focal length and improve the imagining quality in response to temperature fluctuation.