Projector Ultraviolet Light Detection for Lamp Deterioration
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Solution Overview
Problem
Existing projectors fail to accurately detect devitrification in discharge lamps, leading to incorrect assessment of their deterioration state and reduced product life due to reliance on lamp voltage alone.
Innovation Solution
Incorporating a detection system that measures the light intensity of ultraviolet light emitted by the discharge lamp, using a reflecting mirror to direct ultraviolet light to a detection section, and optionally using visible light intensity ratios to determine the deterioration state of the light emitting tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lamp voltage detection is used to determine discharge lamp deterioration, then the detection method is simple, but the measurement precision is insufficient to accurately detect devitrification
Solution Approach 1:
The patent introduces an ultraviolet light detection section as an intermediary measurement tool. Instead of directly measuring lamp voltage, the system detects ultraviolet light intensity transmitted through the light emitting tube, which serves as a mediator to indicate the degree of devitrification. This intermediary approach enables accurate deterioration detection without requiring complex voltage analysis circuits.
2Measurement precision
If a detection section is added to measure ultraviolet light intensity, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The detection section is designed with multi-functionality to reduce overall device complexity. The same detection section can measure both ultraviolet light intensity for deterioration assessment and visible light intensity for color temperature monitoring. This universal detection mechanism avoids the need for separate detection systems for different measurement purposes.
Solution Approach 2:
The system utilizes the light emitting tube's own emitted ultraviolet light as the measurement source, eliminating the need for external light sources or complex illumination systems. The discharge lamp serves itself as both the object being monitored and the source of measurement signal, simplifying the detection system architecture.
3Measurement precision
If the detection section is positioned to directly face the discharge lamp, then the ultraviolet light detection is maximized, but the visible light output to the projection system is reduced
Solution Approach 1:
The detection system is spatially segmented from the main optical path. The ultraviolet detection section is positioned at a specific angle and distance from the discharge lamp, separated from the visible light collection path by shield members with openings. This segmentation allows independent optimization of ultraviolet detection without compromising visible light output to the projection system.
Solution Approach 2:
Shield members with strategically positioned openings serve as intermediaries to control light paths. These shields block direct visible light from reaching the detection section while allowing ultraviolet light to pass through to the detector, acting as a selective mediator that separates the two measurement functions spatially.
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
Accurately determining the deterioration state of the discharge lamp, enabling appropriate maintenance and extending its product life by detecting devitrification and other deterioration factors.
Implementation Method 1
a first detection section configured to detect ultraviolet light out of the light emitted from the discharge lamp
Implementation Method 2
a reflecting mirror configured to reflect a part of the light emitted from the discharge lamp toward a predetermined direction, the reflecting mirror transmits the ultraviolet light out of the light emitted from the discharge lamp
Data Source
AI summary
A projector according to an aspect of the invention includes a discharge lamp having a light emitting tube and configured to emit light, a light modulation device configured to modulate the light emitted from the discharge lamp in accordance with an image signal, a projection optical system configured to project the light modulated by the light modulation device, a first detection section configured to detect ultraviolet light out of the light emitted from the discharge lamp, and a control section configured to determine a deterioration state of the light emitting tube based on a light intensity of the ultraviolet light detected by the first detection section.