Camera Device with Silent Stepper-Driven Infrared Filter Switching
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Solution Overview
Problem
Camera devices with photosensitive elements detect infrared light, causing color deviation in images under sufficient visible light conditions, and existing solutions generate noise during filter switching.
Innovation Solution
A camera device with a movable member containing an infrared filter, driven by a stepper motor, allows the filter to be switched over the photosensitive surface based on light conditions, using a gear or direct connection mechanism for smooth movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the photosensitive element detects infrared light, then the detection range of light wavelengths is expanded, but the color accuracy of the image deviates from human perception
Solution Approach 1:
The patent extracts the infrared filtering function from a fixed structure and places it on a movable member that can be positioned over or away from the photosensitive element. This allows the system to selectively remove infrared detection capability when color accuracy is needed, resolving the contradiction between extended detection range and color precision.
2Ease of operation
If a traditional motor is used to switch the infrared filter, then the filter switching function is achieved, but noise is generated that may disturb personnel
Solution Approach 1:
The patent replaces traditional noisy mechanical motors with a stepper motor that operates silently. The stepper motor drives the movable member through a gear mechanism, achieving filter switching functionality while eliminating the harmful noise factor that would disturb personnel in the surveillance environment.
3Measurement precision
If the infrared filter is always positioned to cover the photosensitive surface, then color accuracy is maintained, but the camera cannot detect infrared light when needed
Solution Approach 1:
The patent transforms the static infrared filter positioning into a dynamic system where the movable member can switch between covering and non-covering positions. This dynamic capability allows the camera to adapt between color-accurate visible light mode and infrared detection mode, resolving the contradiction between maintaining color accuracy and preserving infrared detection 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
Improves image quality under varying light conditions by filtering infrared light when needed and reduces noise during switching, ensuring clearer images without disturbing the environment.
Implementation Method 1
The movable member comprises an infrared filter. When the movable member is at the first position, the infrared filter covers the photosensitive surface
Implementation Method 2
The stepper motor is directly or indirectly connected to the movable member, and the stepper motor is configured to drive the movable member to move between a first position and a second position
Data Source
AI summary
A camera device includes a circuit board, a movable member, and a stepper motor. The circuit board has a photosensitive element, and the photosensitive element has a photosensitive surface. The movable member is on the circuit board, and the movable member includes an infrared filter. The stepper motor is directly or indirectly connected to the movable member, and the stepper motor is configured to drive the movable member to move between a first position and a second position with respect to the circuit board. When the movable member is at the first position, the infrared filter covers the photosensitive surface; when the movable member is at the second position, the infrared filter does not cover the photosensitive surface.