Light Projector Lens De-fogging via Airflow and Infrared Heating
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Solution Overview
Problem
Light projectors used in theatrical settings face challenges with theatrical fog condensation on optical components, which diffuses images and shortens component life, especially with solid-state LED light sources that absorb less infrared energy, making it difficult to control condensation without costly filtration systems.
Innovation Solution
A light projector system that includes a fan for generating airflow to de-fog condensate on the lens, an operator input panel for selecting de-fogging functions, and an infrared light source to heat the lens, along with a resistive conductor to dissipate heat, all integrated with a housing to manage theatrical haze effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter system is incorporated to prevent fog particle condensation on optical components, then the reliability of optical components is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the harmful fog particles from the optical path by introducing a separate airflow system that draws air (and fog particles) away from the optical components through dedicated air inlets and outlets, eliminating the need for filters in the main optical path
Solution Approach 2:
The patent introduces an intermediary airflow system that acts as a mediator between the foggy environment and the optical components. This separate air circulation system protects optical components by creating a protective air barrier without requiring direct contact or filtration of the main atmospheric fog
2Temperature
If halogen or arc light sources are used to generate sufficient infrared energy to prevent condensation, then the de-fogging capability is improved, but the energy consumption and heat generation increase
Solution Approach 1:
The patent uses pneumatic principles by introducing a controlled airflow system to remove condensation from optical components. The airflow physically carries away moisture and fog particles, providing an alternative to thermal methods for preventing condensation
Solution Approach 2:
The patent changes the approach from thermal parameter control (using infrared heating) to airflow parameter control. By adjusting air flow rate and direction, the system effectively prevents condensation without requiring high energy input for heating
3Reliability
If the fan operates continuously to maintain de-fogging, then the image clarity is maintained, but the energy consumption and noise increase
Solution Approach 1:
The patent implements periodic action by operating the fan intermittently rather than continuously. The control system activates the fan when condensation is detected or anticipated (such as when the projector is turned on or when environmental conditions favor condensation), and deactivates it when not needed, reducing energy consumption and noise
Solution Approach 2:
The patent employs feedback control where the operational state of the fan is adjusted based on detected conditions. The system monitors environmental factors and operational status to dynamically control fan operation, ensuring image clarity is maintained only when necessary
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 system effectively reduces condensate on optical components, maintaining image clarity and extending component life without the need for expensive filtration systems, while allowing for customizable de-fogging based on operational conditions.
Implementation Method 1
A substantial portion of the air flow may be directed to impinge upon the first side of the lens to cause de-fogging of theatrical haze condensate on the first side of the lens
Implementation Method 2
More recent light projectors may comprise a light source of a solid state LED light source that emits less infrared energy than halogen or arc light sources making the problem of controlling condensation by theatrical haze even more difficult because the output lens absorbs less infrared energy from the light source
Implementation Method 3
a resistive conductor to dissipate heat
Implementation Method 4
The output lens can be a lens having an optical power or a transparent output window
Data Source
AI summary
A light projector for operation during a show that contains theatrical haze. The light projector may include a light source, a lens, a fan, and a housing having an inner chamber. The lens may have a first side and a second side. The first side of the lens may be contained within the inner chamber of the housing. The second side the lens may be outside of the inner chamber of the housing. The fan may be configured to be operated to generate air flow inside the inner chamber of the housing. A substantial portion of the air flow may be directed to impinge upon the first side of the lens to cause de-fogging of theatrical haze condensate on the first side of the lens.