Laser Light Source Tone Stability via Feedback Control
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Solution Overview
Problem
The output of laser devices emitting red, green, and blue light varies with environment and time, causing inconsistencies in the tone of mixed-color light supplied by light source devices.
Innovation Solution
A light source device comprising multiple laser modules emitting different colors, optical sensors to detect brightness, and a control unit that adjusts brightness to maintain target values, modifying all values proportionally if any detected value cannot be controlled to the target, ensuring consistent mixed-color light tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser devices are used to emit red, green, and blue light, then the light source device can provide mixed-color light, but the output varies with environment and time causing tone inconsistencies
Solution Approach 1:
The patent implements a feedback control mechanism where optical sensors continuously detect the brightness of each colored light, and the control unit adjusts the drive signals to laser devices based on detected values versus target values. This closed-loop feedback system compensates for output variations caused by environmental changes and aging, maintaining consistent mixed-color light tone.
Solution Approach 2:
The control unit dynamically changes operational parameters (drive signals) to laser devices based on detected brightness values. When detected values deviate from target values, the control unit modifies the drive signals to adjust the brightness of individual colored lights, thereby maintaining the desired tone of mixed-color light despite parameter drift in laser devices.
2Manufacturing precision
If the output of each laser device is adjusted at shipment, then the mixed-color light tone is initially correct, but the tone varies over time due to output variations
Solution Approach 1:
The feedback control mechanism continuously monitors the brightness of each colored light using optical sensors and automatically adjusts drive signals to maintain target brightness values. This ongoing adjustment compensates for the natural drift that occurs after initial manufacturing calibration, ensuring long-term tone stability without requiring re-adjustment.
Solution Approach 2:
The light source device performs self-adjustment through its control unit that automatically modifies drive signals based on real-time detection by optical sensors. This self-service capability allows the system to maintain correct tone without external intervention or manual re-calibration, compensating for aging and environmental effects autonomously.
3Stability of the object's composition
If the control unit modifies all detection target values proportionally when one cannot be controlled, then the tone remains balanced, but the absolute brightness level changes
Solution Approach 1:
The control unit changes the detection target values for all colored lights proportionally when a constraint is encountered. This parameter modification maintains the relative relationships between colors (color balance) while adapting to the constraint, ensuring the mixed-color light remains tonally accurate even if the absolute brightness level needs adjustment.
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 tone of mixed-color light is maintained despite variations in laser device output, ensuring stable color rendition across different environments and usage conditions.
Implementation Method 1
a plurality of optical sensors that each detect the brightness of the plurality of colored lights
Data Source
AI summary
A laser light source includes; a plurality of laser devices that emit respectively different colors of laser light; a plurality of optical sensors that respectively detect the brightness of the plurality of colored lights; and a control unit that controls the brightness of each of the plurality of colored lights so that the detected values from the plurality of optical sensors become detection target values of brightness of the plurality of colored lights respectively corresponding to the brightness of synthesized light that is obtained by synthesizing the plurality of colored lights. If at least one of the detected values of the plurality of optical sensors cannot be controlled to be the detection target value, the control unit modifies all of the detection target values at the same proportion and controls the brightness of each of the plurality of colored lights to become the detection target values that were modified.