Laser Illumination Unit Light Quantity Distribution Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projector systems using laser light sources face challenges in maintaining consistent illumination due to temperature-induced variations in light quantity distribution, leading to inaccurate light control and color balance.
Innovation Solution
Incorporating a light-quantity-distribution control device between the optical-path branching device and photodetector in the illumination unit, which controls the light quantity distribution incident on the photodetector, thereby stabilizing the emitted light quantity and reducing variations caused by temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photodetector is disposed in the optical system to monitor a part of the laser beam for detecting light quantity, then the emitted light quantity can be controlled to be kept constant, but it becomes difficult to respond to temperature changes in the light quantity distribution, making accurate light control impossible
Solution Approach 1:
A light-quantity-distribution control device is introduced as an intermediary component between the optical-path branching device and the photodetector. This device controls the light quantity distribution in the light flux incident on the photodetector, ensuring that the detected light quantity accurately reflects the total emitted light quantity even when temperature-induced distribution changes occur. The intermediary device mediates between the raw laser output and the detection system, correcting for distribution variations.
2Use of energy by moving object
If single-color lasers are used as the light source to achieve wide color reproduction range and low power consumption, then power consumption is reduced and color reproduction is improved, but temperature-induced variations in light quantity distribution occur, affecting illumination consistency
Solution Approach 1:
The system employs a feedback mechanism where the photodetector continuously monitors the light flux after it has been conditioned by the light-quantity-distribution control device. The detected light quantity information is fed back to control the emitted light quantity of the laser light source, creating a closed-loop control system that compensates for temperature-induced variations and maintains stable illumination output.
Solution Approach 2:
The light-quantity-distribution control device serves as a mediator that processes the laser light before it reaches the photodetector. This intermediary component ensures that the photodetector receives a stabilized light flux whose quantity distribution is controlled, allowing accurate detection of total light quantity despite temperature-related distribution changes in the original laser beam.
3Device complexity
If the light flux is directly monitored without controlling light quantity distribution, then the system structure is simple, but the photodetector cannot accurately detect the total light quantity when temperature changes cause distribution variations
Solution Approach 1:
A light-quantity-distribution control device is introduced as an intermediary component between the optical-path branching device and the photodetector. This device controls the light quantity distribution in the light flux incident on the photodetector, ensuring that the detected light quantity accurately reflects the total emitted light quantity even when temperature-induced distribution changes occur.
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 solution enhances the accuracy of light control in projector systems, maintaining consistent illumination and color balance, even with temperature fluctuations, and ensures stable image display.
Implementation Method 1
a photodetector receiving a light flux that travels on the other optical path
Implementation Method 2
a light-quantity-distribution control device disposed between the optical-path branching device and the photodetector on the other optical path, the light-quantity-distribution control device controlling a light quantity distribution in the light flux to be incident upon the photodetector
Implementation Method 3
an illumination unit that emits light including a laser beam
Implementation Method 4
LED (Light Emitting Diode) has been mainly used as the light source of the illumination unit
Data Source
AI summary
An illumination unit includes a light source section, an optical-path branching device, a photodetector, a control section, and a light-quantity-distribution control device. The light source section includes a laser light source. The optical-path branching device outputs light incident from the light source section, by branching the light into an outgoing optical path of illumination light and other optical path. The photodetector receives a light flux that travels on the other optical path. The control section controls an emitted light quantity in the laser light source, based on a quantity of the light flux received by the photodetector. The light-quantity-distribution control device is disposed between the optical-path branching device and the photodetector on the other optical path. The light-quantity-distribution control device controls a light quantity distribution in the light flux to be incident upon the photodetector.