IR Camera Reflector for External Area Illumination
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Solution Overview
Problem
Cameras with infrared ray light sources face challenges in photographing external areas without screen saturation effects, as high irradiation intensity leads to saturation while low intensity results in dark external areas.
Innovation Solution
A camera design featuring a lens assembly with infrared ray light sources and a reflector installed to direct reflected infrared rays to external areas, ensuring these areas are not dark even with reduced irradiation intensity by classifying the photographing target areas within and beyond the half-power angle of the light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the irradiation intensity of IR light sources is increased to illuminate external areas, then the external irradiation area can be photographed without darkness, but screen saturation effect increases
Solution Approach 1:
The patent applies local quality by directing infrared rays to different areas with different intensity requirements. The reflector is positioned to redirect IR rays specifically to external areas (beyond half-power angle) while maintaining lower intensity in main areas (within half-power angle) to avoid saturation. This spatial differentiation of irradiation intensity resolves the contradiction between illuminating external areas and avoiding screen saturation.
Solution Approach 2:
The patent introduces a reflector as an intermediary element between the IR light sources and the external areas. The reflector redirects infrared rays that would otherwise be wasted beyond the half-power angle to illuminate external areas. This intermediary allows the system to achieve external area illumination without increasing the direct irradiation intensity from the light sources, thereby avoiding screen saturation.
2Object-generated harmful factors
If the irradiation intensity of IR light sources is decreased to reduce screen saturation effect, then the frequency of screen saturation decreases, but the external irradiation area becomes dark
Solution Approach 1:
The reflector serves as an intermediary that captures infrared rays emitted beyond the half-power angle and redirects them to external areas. This allows the system to maintain low direct irradiation intensity (reducing screen saturation) while still achieving adequate illumination in external areas through the reflected rays.
Solution Approach 2:
The patent converts what would normally be wasted infrared radiation (emitted beyond the half-power angle where intensity is already low) into a beneficial resource by using the reflector to redirect these rays to external areas. This transforms the ineffective peripheral radiation into useful illumination for external areas without requiring increased overall irradiation intensity.
3Area of stationary object
If IR light sources are arranged to cover external areas, then the external irradiation area can be photographed, but the main irradiation area may experience screen saturation
Solution Approach 1:
The patent implements local quality by using the reflector to create spatially differentiated irradiation patterns. Main areas (within half-power angle) receive lower intensity direct radiation from light sources positioned to avoid direct saturation, while external areas (beyond half-power angle) receive concentrated reflected radiation from the reflector. This localized control of radiation distribution allows comprehensive area coverage without screen saturation in the main photographing region.
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 camera effectively captures external areas without darkness, even when irradiation intensity is kept low to minimize screen saturation, by using a reflector to redirect infrared rays beyond the half-power angle, maintaining image quality.
Implementation Method 1
a reflector 609 is installed to correspond to the IR light sources 602a and 602b... IRs reflected by the reflector 609 reach the external irradiation area AR3
Data Source
AI summary
A camera, including a lens assembly and a plurality of infrared ray (IR) light sources arranged around the lens assembly, has a photographing target area classified as a main irradiation area and an external irradiation area. The main irradiation area is set not to exceed a half-power angle of the IR light sources. The external irradiation area is set to exceed the half-power angle of the IR light sources. A reflector is installed corresponding to the IR light sources. IRs reflected by the reflector reach the external irradiation area.