Fluid Light Guide Macro Illumination With Sharp Field Edges
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Solution Overview
Problem
Existing lighting solutions for macro photography fail to provide a sharply defined, adjustable light field with high illuminance and uniform light distribution, suitable for small objects, while avoiding heat and air flow issues, and maintaining a clear working distance and edge sharpness.
Innovation Solution
An arrangement using a high-power LED, fluid light guide, high-aperture asymmetrical condenser lens, diaphragm tube, and imaging stage with achromatic lens groups to create a sharply defined, adjustable light field with a diameter between 0.9 mm and 12 mm, achieving high illuminance and a free working distance of at least 80 mm, and utilizing a shading aperture and iris diaphragm for object-adapted illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high-power LED with output above 20 watts is used to achieve high illuminance, then the illuminance requirement is met, but waste heat becomes detrimental to the object and photographic equipment
Solution Approach 1:
A fluid light guide is introduced as an intermediary between the high-power LED light source and the object to be illuminated. The light guide transmits light from the LED (positioned at a safe distance) to the object, allowing high illuminance to be achieved without placing the hot LED near the object, thus avoiding thermal damage while maintaining high illumination intensity
Solution Approach 2:
The lighting system is segmented into separate functional components: the light source (LED), the light transmission medium (fluid light guide), and the illumination target (object). This segmentation allows the LED to be positioned far from the object (avoiding heat issues) while still delivering high illuminance through the light guide
2Temperature
If an air flow is used for cooling the LED, then the heat is removed, but sensitive objects such as delicate petals are exposed to air flow causing fluttering or movement
Solution Approach 1:
The fluid light guide serves as a thermal intermediary that conducts heat away from the LED internally through its fluid circulation system, eliminating the need for external air flow cooling. This allows the LED to be cooled efficiently without exposing the photographed object to disturbing air currents
Solution Approach 2:
The mechanical air flow cooling system is replaced with a fluid-based thermal management system integrated into the light guide. The fluid circulation provides cooling through convection within the closed light guide system rather than through external air flow, avoiding mechanical disturbance of the object
3Manufacturing precision
If the arrangement is placed close to the object, then the light field can be focused sharply, but the arrangement casts a shadow and restricts the free view of the object
Solution Approach 1:
The fluid light guide acts as an extended light delivery system that allows the light source to be positioned far from the object while still achieving sharp focus. The light guide transmits light over the required distance (at least 80 mm) without the arrangement itself needing to be close to the object, thus avoiding shadow casting and restricting the view
4Device complexity
If a simple lens attachment is used to focus light, then the system is simple, but it only produces a blurred spot of light with diameter around 30 mm which is far from adequate
Solution Approach 1:
The fluid light guide serves as a precision light delivery intermediary that replaces the need for complex focusing optics. By guiding light through the fluid medium to the object, it achieves sharp light field edges and precise positioning without requiring complex lens systems or attachments
Solution Approach 2:
The system changes the physical state and properties of the light transmission medium by using a fluid light guide instead of traditional solid optics. This parameter change enables precise light field control, sharp edges, and accurate positioning that simple lens attachments cannot achieve
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 achieves high illuminance in the upper five-digit lux range with a defined color temperature of 5600K+/−100K, a sharp light field edge, and adjustable light field size, suitable for macro photography without heat or air flow disturbances, ensuring edge sharpness and uniform illumination.
Implementation Method 1
a light guide, which is configured as a fluid light guide with a diameter of the optically usable range between 2.5 mm and 10 mm
Implementation Method 2
a diaphragm tube which is formed with a high-aperture, asymmetrical condenser lens
Implementation Method 3
an imaging stage downstream of the diaphragm tube for an amount of the magnification beta′ when imaging the shading aperture between 0.7 and 2
Data Source
AI summary
A proposed arrangement is described for generating a spaced, adjustable light field for macro photography, for object-adapted illumination with a sharply defined light field edge. This arrangement is equipped with a continuous light source featuring a single high-power LED, followed by an optical coupling module that efficiently couples the light into a flexible fluid light guide. At the exit window of the fluid light guide, a diaphragm tube with a high-aperture condenser lens and a shading aperture is arranged. Downstream of the diaphragm tube is an imaging stage comprising at least one lens group with an imaging magnification approximately equal to one for the sharp imaging of the shading aperture to generate a light field. The sharply imaged light field, as an image of the shading aperture, is formed at a distance of at least 80 mm from the front mechanical stop of the housing of the imaging stage.