Image Capturing Device Light Leakage Isolation
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Solution Overview
Problem
Conventional face recognition devices experience light leakage and reduced accuracy due to infrared light penetration and interference between IR LEDs and visible LEDs, leading to poor image recognition and appearance issues.
Innovation Solution
An image capturing device with a connection body that isolates the IR light-emitting component, preventing light leakage by positioning it in a light passage and using nontransparent pads to shield the lenses, enhancing face recognition efficiency and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the IR LED uses high brightness infrared ray, then the face recognition capability is improved, but the infrared light penetrates into the base seat of the lens causing light leakage
Solution Approach 1:
The patent divides the housing into multiple sections: a first housing section containing the IR LED and a second housing section containing the lens. A partition wall separates these sections, creating isolated light paths. This segmentation prevents infrared light from the IR LED from penetrating into the lens base seat, thereby eliminating light leakage while maintaining high brightness for face recognition.
Solution Approach 2:
The patent extracts the IR LED from the common housing space and places it in a separate first housing section. By removing the IR LED from proximity to the lens and creating a dedicated light path, the harmful infrared radiation is isolated from the optical components, preventing penetration and light leakage while preserving the high brightness capability.
2Device complexity
If the LED indication light is disposed beside the IR LED, then the device structure is simplified, but the light from both LEDs interferes with each other causing poor appearance
Solution Approach 1:
The patent segments the housing into distinct sections: the first housing section contains both the IR LED and LED indication light, while the second housing section contains the lens. A partition wall creates separate light paths within the first section, allowing both LEDs to be disposed close together structurally while preventing their light from interfering with each other or with the lens, thus maintaining simple device structure without light interference issues.
3Length of stationary object
If light is projected onto the inner side of the cover body and refracted, then the light path is extended, but the refracted light projects onto the lens causing image refraction and lowering recognition accuracy
Solution Approach 1:
The patent extracts the light path from the cover body interior and creates a dedicated first light path within the first housing section. By removing the cover body refraction interface from the optical path and providing a direct light path from the LEDs through the partition wall to the lens, the light travels without unnecessary refraction, maintaining measurement precision for accurate face recognition while still allowing sufficient light path length for effective illumination.
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
Effectively avoids light leakage and interference, improving face recognition accuracy and the overall appearance of the device by isolating the IR light-emitting component and lenses, resulting in enhanced recognition efficiency.
Implementation Method 1
The connection body has a first connection section. The first connection section has a first open end and a second open end corresponding to the first open end. The first open end abuts against the IR light-emitting component or the upper side of the circuit board in adjacency to the IR light-emitting component. The first and second open ends together define a first light passage. The IR light-emitting component is positioned in the first light passage.
Implementation Method 2
a connection body used to isolate an infrared (IR) light-emitting component and avoid leakage of the light emitted from the IR light-emitting component
Implementation Method 3
The IR LED emits infrared ray to a human face. The infrared ray is reflected back from the human face to be received by the lens so as to obtain the face image
Data Source
AI summary
An image capturing device includes a circuit board, an image capturing module, a light source module disposed on the circuit board and a connection body disposed above the light source module. The image capturing module has a first lens set and a second lens set disposed on the circuit board. The connection body has a first connection section having a first open end and a second open end. The first open end of the first connection section abuts against the light-emitting component or the upper side of the circuit board in adjacency to the light-emitting component. The first and second open ends together define a first light passage. The light-emitting component is positioned in the first light passage. The image capturing device can effectively avoid light leakage of the image.