Camera Module with Temperature-Compensated Liquid Lens Diopter
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Solution Overview
Problem
Conventional camera modules with multiple lenses face issues of increased size and power consumption due to lens movement for auto-focusing and hand-shake compensation, and liquid lenses suffer from focal length deformation with temperature changes, affecting resolution.
Innovation Solution
A camera module with a liquid lens assembly that adjusts the interface position between two liquids using electrical energy, incorporating a temperature sensor and controller to compensate for temperature-induced diopter changes, maintaining resolution by dividing diopter inclination regions and applying specific driving signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a liquid lens is used to adjust interface position between two liquids, then module size and power consumption are reduced, but focal length deforms according to temperature
Solution Approach 1:
The patent implements a feedback mechanism where a temperature sensor detects the temperature of the liquid lens, and a controller adjusts the driving voltage applied to the liquid lens based on the detected temperature. This closed-loop feedback system compensates for temperature-induced focal length deformation, maintaining optical performance while using a compact liquid lens design.
Solution Approach 2:
The patent changes the operating parameters of the liquid lens by dynamically adjusting the driving voltage based on temperature conditions. The controller modifies the voltage applied to the liquid lens to compensate for temperature effects, thereby maintaining stable focal length and diopter values across varying temperature environments.
2Measurement precision
If driving voltage is increased to adjust interface movement, then resolution is improved, but temperature-induced deformation affects accuracy
Solution Approach 1:
The controller uses feedback from the temperature sensor to dynamically adjust the driving voltage, compensating for temperature-induced diopter changes. This ensures that the liquid lens maintains accurate focal length and resolution characteristics despite temperature variations that would otherwise cause deformation.
Solution Approach 2:
The system applies preliminary compensation by detecting temperature changes and adjusting the driving voltage before significant focal length deformation occurs. This proactive approach prevents accuracy degradation by counteracting temperature effects in advance.
3Adaptability or versatility
If multiple lenses are combined for auto-focusing and hand-shake compensation, then photographing functions are enhanced, but device size increases
Solution Approach 1:
The patent applies multi-functionality by enabling the liquid lens to perform multiple functions: auto-focusing, hand-shake compensation, and optical zoom. By integrating these functions into a single liquid lens unit rather than using multiple separate lenses, the device achieves enhanced photographing capabilities while maintaining a compact size.
Solution Approach 2:
The patent merges multiple lens functions into a single liquid lens assembly. The liquid lens integrates auto-focusing, hand-shake compensation, and zoom capabilities that would traditionally require separate lenses and driving mechanisms, thereby reducing overall device size while maintaining functional versatility.
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 maintains lens resolution and accuracy by compensating for temperature-induced deformations, reducing module size and power consumption, and enhancing optical performance.
Implementation Method 1
research has been conducted on a liquid lens unit, which performs the auto-focusing function and the hand-shake compensation function by electrically adjusting a curvature of an interface of two types of liquids
Implementation Method 2
a focal length or diopter is deformed according to the temperature
Data Source
AI summary
An embodiment is a camera module comprising: a lens assembly comprising a liquid lens which comprises a first liquid and a second liquid forming an interface with each other; a temperature sensor for sensing the temperature information of the liquid lens; a controller for adjusting the interface by applying a driving signal to the liquid lens; and a compensation unit for outputting, to the controller, feedback information in which the inclination of the diopter of the liquid lens with respect to the driving signal is proportional to the temperature in a first area and the inclination of the diopter of the liquid lens with respect to the driving signal is inversely proportional to the temperature in a second area which differs from the first area.