Movable Polarization Filter for Vehicle Camera Glare Reduction
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Solution Overview
Problem
Camera modules in vehicles face challenges in capturing high-quality images in adverse weather conditions due to diffuse light reflections and sudden environmental changes, leading to glare and image deterioration.
Innovation Solution
A camera module design that includes a movable polarization filter and filter actuator, allowing the filter to move linearly and rotate between positions, effectively blocking reflected light and improving image quality by selectively applying polarization when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed filter is used in the camera module, then the structure is simple, but the camera cannot respond to sudden changes in external environment (e.g., weather changes)
Solution Approach 1:
The patent applies the dynamics principle by making the filter movable rather than fixed. The filter can be positioned in different locations within the optical path based on environmental conditions, allowing the camera module to adapt to sudden changes in weather and lighting conditions. The filter actuator enables dynamic repositioning of the filter between a first position (blocking reflected light) and a second position (allowing light passage), resolving the contradiction between adaptability and structural simplicity.
2Reliability
If the filter is always positioned to block reflected light, then image quality in bad weather is improved, but light from external subjects is blocked even in good weather
Solution Approach 1:
The filter actuator enables dynamic positioning of the filter between two states: a first position where the filter blocks reflected light to improve image quality in adverse weather conditions, and a second position where the filter is moved away from the optical path to allow maximum light transmission in good weather conditions. This dynamic adjustment resolves the contradiction between maintaining high image quality in bad weather and ensuring sufficient light transmission in good weather.
3Reliability
If the filter is positioned close to the image sensor, then polarization operation is effective, but the filter blocks necessary light from external subjects
Solution Approach 1:
The filter actuator enables the filter to be dynamically positioned at different locations along the optical path. When polarization operation is needed, the filter is positioned close to the image sensor to effectively polarize incoming light and block reflected light. When polarization is not needed, the filter is moved to a second position away from the optical path to allow unobstructed light transmission from external subjects to the image sensor, resolving the contradiction between polarization effectiveness and light reception.
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 effectively blocks unnecessary reflected light, enhancing image quality in harsh environments and ensuring clear images are captured, even in rainy or snowy conditions, by positioning the filter between the lens module and image sensor within the camera module's housing.
Implementation Method 1
a filter configured to perform a polarization operation
Data Source
AI summary
A camera module is provided. The camera module includes a lens module including one or more lenses; an image sensor configured to convert light passing through the lens module into an electrical signal; and a filter configured to perform a polarization function, wherein the filter is configured to be movable in a space formed between the lens module and the image sensor.