Camera Lens Thermal Expansion Compensation
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Solution Overview
Problem
Existing 3D camera lens modules in portable electronic devices face challenges in field-depth calibration due to temperature-induced changes in baseline length between lenses, making it difficult to accurately calculate and adjust the field depth, especially since internal temperatures vary across different components.
Innovation Solution
A camera lens system featuring a 1×2 integral glass lens with a central processing unit and thermal compensation module, where the first lens is formed on a glass substrate with a low thermal expansion coefficient, allowing for precise calculation and adjustment of baseline length changes using the CPU's computation module, and the thermal expansion compensation module moves the second lens to maintain consistent field depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resin lenses are used in the 3D camera module, then the device can be manufactured with current materials and processes, but the baseline length changes with temperature causing field-depth calibration failure
Solution Approach 1:
The patent changes the material parameter of the lens from resin to glass, which has a significantly lower thermal expansion coefficient. This parameter change ensures that the baseline length remains stable across temperature variations, thereby maintaining field-depth calibration accuracy while still being manufacturable with standard glass lens processes.
2Reliability
If the baseline length is made adjustable to compensate for thermal expansion, then field-depth calibration can be maintained, but the device complexity increases
Solution Approach 1:
The patent extracts the thermal expansion problem from the baseline structure by using a glass lens with negligible thermal expansion. This eliminates the need for complex adjustable mechanisms (such as motorized lens mounts or active cooling systems) that would otherwise be required to compensate for baseline length changes, thereby maintaining calibration accuracy without increasing device complexity.
3Reliability
If temperature sensing and calculation systems are added to compensate for baseline changes, then field-depth can be calibrated, but the device complexity and energy consumption increase
Solution Approach 1:
The patent converts the harmful effect of thermal expansion into a beneficial situation by selecting a glass lens material whose thermal expansion coefficient is so low that temperature variations no longer cause significant baseline length changes. This eliminates the need for temperature sensing, calculation, and active compensation systems, thereby maintaining calibration accuracy without increasing system complexity or energy consumption.
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
Enables effective field-depth calibration by minimizing thermal expansion effects, ensuring consistent image quality across varying temperatures within portable electronic devices.
Implementation Method 1
the first lens is formed on a glass substrate with a low thermal expansion coefficient, allowing for precise calculation and adjustment of baseline length changes
Data Source
AI summary
The present disclosure discloses a camera lens and a calibration method of field-depth for the camera lens. The camera lens includes a lens module, a central processing unit and a thermal expansion compensation module. The lens module includes a first lens and a second lens with a baseline length b2 to the first lens. The first lens includes a first lens unit formed on same glass substrate and a second lens unit with a baseline length b1 to the first lens unit. The baseline length change value between the second lens and the first lens can be calculated. Therefore the thermal expansion of the camera lens can be calibrated.