Principle of Operation: Reflective film stretched across a rigid 4’ diameter ring. Integral hand pump/handle
assembly creates a vacuum inside the ring, causing the reflective film to form into a smooth concave mirror that
focuses light into a 4-6” spot.
Mirror Diameter- 45”
Reflective Surface Aluminized Polymer Film
Reflective Area 11.5 Sq. Ft.
Weight 8-10 lbs., depending on configuration
Minimum Focal Length 8 Ft.
Minimum Focal Area 4”
Concentration 130 suns
Time to Boil 48 Oz. of Water 7 minutes (at 900 w/msq. sunlight intensity)
Vacuum Hold Time 2-3 days- always cover dish when not in use
Maximum Heat Flux 1300 F
Focal point directed onto a 4" dia. copper
plate, with a Type K thermocouple attached.
Back of copper plate was insulated.
A Better Focus Co.
U.S Patent # 7,374,301