Operating Light Control System Spatial Luminance Adaptation
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Solution Overview
Problem
Existing surgical light control systems fail to optimize light intensity independently of distance from the operating field, leading to incorrect luminous field size adjustments, excessive illumination of surrounding areas, and impermissible luminance differences that impair visual comfort and performance.
Innovation Solution
A method that involves location-selective determination of luminance distribution in a larger measuring field, adapting the illuminated field size to match the surgical field, and adjusting light intensity based on surrounding luminance to optimize the luminance ratio between the surgical field and its surroundings, using sensors or a calibrated camera for spatially resolved measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the illuminated field size is increased to ensure adequate lighting coverage, then the illumination intensity in the surgical field is improved, but the surrounding area becomes excessively illuminated creating glare and reducing visual comfort
Solution Approach 1:
The patent applies local quality by differentiating the illumination requirements of different spatial zones. The control system divides the measurement field into the surgical field (requiring high illumination) and surrounding areas (requiring lower illumination to avoid glare). By locally adapting the illuminated field size to match the detected surgical field boundaries, the system provides high illumination intensity where needed while minimizing excessive illumination in surrounding areas, thus resolving the contradiction between adequate lighting coverage and visual comfort.
2Illumination intensity
If the light intensity is increased to improve visibility of the surgical field, then the visual performance is improved, but the luminance difference between the surgical field and surrounding areas becomes excessive impairing visual comfort
Solution Approach 1:
The patent implements feedback control by continuously measuring the luminance distribution in the measurement field using a sensor or camera, detecting the surgical field boundaries, and using this information to dynamically adjust the illuminated field size and light intensity. The control system monitors the luminance ratio between the surgical field and surrounding areas, and adjusts the illumination parameters to maintain an optimal luminance difference that improves visibility while preventing excessive contrast that would impair visual comfort.
3Illumination intensity
If conventional distance-based control is used to adjust illuminance, then the illuminance can be maintained at a constant level, but the illuminated field size does not accurately match the surgical field size leading to excessive surrounding illumination
Solution Approach 1:
The patent replaces the mechanical distance-based control system with an optical sensing and image processing system. Instead of using distance measurements and mechanical adjustments to maintain constant illuminance, the system uses a sensor or camera to detect the surgical field boundaries, processes the luminance distribution image to determine field size, and electronically controls the illumination parameters. This substitution of mechanical control with optical sensing and electronic control enables precise matching of the illuminated field size to the actual surgical field size, eliminating excessive surrounding illumination while maintaining adequate illuminance levels.
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
This approach ensures optimized light intensity adjustment that enhances visual comfort and performance by matching the illuminated field size to the surgical field and adjusting light intensity according to the surrounding environment, reducing glare and improving visual clarity.
Implementation Method 1
a sensor or a calibrated camera for spatially resolved measurements
Data Source
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Figure 4
AI summary
In a method for controlling an operating light, the luminance distribution in a measuring field is determined in a location-selective manner and the size of the luminous field is adapted to the size of the operating field, taking the luminance distribution into account.