What is the patented Lens Defogger I am hearing so much about?
High End Systems a Barco Company has had a primary focus to produce LED automated lighting since 2010. During the research and deployment of these power saving, efficient and long life products many tests were performed to insure their reliability and high performance. One such test is the immersion of the product in a theatrical haze for a time period to ensure that the optics remain clear and resistant to the condensation of the theatrical haze.
During the early development of the LED lighting products it was realized the LED products produce less infrared radiation in their spectral output (thus no need for a hot mirror). Low spectral infrared is also nice for the performers on stage as there is less heat as a percentage of the illumination. However the lenses in the optical system have a tendency to run cooler. Couple lower infrared with larger diameter lenses that can have temperature differentials between the exterior side of the output lens and the interior side of the output lens and an unwanted condensation of the theatrical haze can develop.
Condensation of the theatrical haze on the output lenses is not desirable as the contrast ratio between the black area and white area of a projected gobo image is reduced. Condensation is undesirable because the condensate can scatter light (much like a diffusion filter) all around the outside of the image. In some cases high condensation looks to lighting designers as if focus has been lost! With condensation on the lenses the performance and sharpness of aerial effects also suffers. Also the view of the output lens from the audience perspective is “plain ugly”
High End Systems to the rescue!
High End Systems with the help of CTO Richard Belliveau innovatively developed several patented systems to significantly reduce this highly annoying occurrence and at this time two US Patents have been issued. The patented lens defogging systems works so well that even non LED type fixtures can benefit from the technology.
To date two US patents have been issued to the innovative theatrical technology:
US Patent 9,188,845 Programmable de-fogger system for a light projector
US Patent 8,770,764 Programmable de-fogger system for a light projector
Videos of industry products under theatrical haze testing
For information about other High End Systems licensed and assigned patents click here: