Liquid Lens Camera Module Thermal Compensation
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Solution Overview
Problem
Existing camera modules with multiple lenses face challenges in achieving high resolution, compact size, and efficient optical zoom and autofocus functions due to the power consumption and thickness issues associated with lens moving apparatuses, and they struggle to maintain resolution against temperature-induced distortions.
Innovation Solution
A camera module incorporating a liquid lens with a conductive and non-conductive liquid interface, where the curvature is adjusted by electrical energy, and a temperature-sensing electrode structure that compensates for thermal changes, allowing for accurate diopter adjustment and reduced temperature-dependent distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a liquid lens is used to adjust focal length electrically, then power consumption is reduced and size is minimized, but resolution deteriorates due to thermal expansion
Solution Approach 1:
The patent implements a feedback mechanism by placing a temperature sensor in direct thermal contact with the liquid lens through a thermal coupling structure. The sensor detects temperature changes and feeds this information to a control unit, which adjusts the focal length compensation accordingly. This closed-loop feedback system enables real-time correction of thermal expansion effects, maintaining resolution while preserving the low power consumption benefits of the liquid lens
Solution Approach 2:
The patent changes the focal length parameter dynamically in response to temperature variations. The control unit adjusts the focal length of the liquid lens based on temperature sensor readings, compensating for thermal expansion effects. This parameter adjustment allows the system to maintain optimal resolution across different temperature conditions while continuing to use the energy-efficient liquid lens
2Adaptability or versatility
If multiple lenses are combined to achieve various photographing functions, then optical zoom and autofocus capabilities are improved, but device size increases
Solution Approach 1:
The patent makes the liquid lens multi-functional by enabling it to perform both autofocus and optical zoom operations through electrical control of its focal length. The same liquid lens can adjust its curvature to achieve different focal lengths, replacing what would traditionally require multiple separate lenses. This universal approach provides various photographing functions while minimizing device size
Solution Approach 2:
The patent replaces mechanical lens moving apparatuses with an electrically controlled liquid lens system. Instead of physically moving solid lenses to achieve focus and zoom, the system uses electrical energy to change the curvature of the liquid lens interface. This substitution eliminates the need for complex mechanical structures, reducing device size while maintaining autofocus and optical zoom capabilities
3Adaptability or versatility
If a lens moving apparatus is added to perform autofocus and hand-tremor compensation, then photographing functions are improved, but power consumption increases
Solution Approach 1:
The patent replaces the mechanical lens moving apparatus with an electrically controlled liquid lens. The liquid lens achieves autofocus by changing its focal length through electrical application to alter the curvature of the liquid-liquid interface. This substitution eliminates the need for motors, gears, and other power-consuming mechanical components, significantly reducing power consumption while maintaining autofocus functionality
4Reliability
If a cover glass is added to protect the lens moving apparatus, then reliability is improved, but device thickness increases
Solution Approach 1:
The patent replaces the mechanical lens moving apparatus that would require protective cover glass with a liquid lens system. The liquid lens is sealed within a chamber and does not require the same level of mechanical protection. This substitution eliminates the need for additional cover glass, reducing device thickness while maintaining the reliability of the optical system
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 solution enables more accurate autofocus and optical image stabilization while reducing the module's size and power consumption, maintaining high resolution across temperature variations.
Implementation Method 1
research has been conducted on a liquid lens configured to electrically adjust the curvature of an interface between two kinds of liquid
Implementation Method 2
capable of preventing deterioration in the resolution of the lens due to thermal expansion in response to a change in temperature
Data Source
Figure 1~2
Figure 3a
Figure 3b~4
AI summary
The present invention provides a camera module including a liquid lens, the camera module comprising: a first plate including a cavity in which conductive liquid and non-conductive liquid are arranged; a common electrode disposed on the first plate; an individual electrode disposed below the first plate; a second plate disposed on a first electrode; and a third plate disposed below a second electrode.