Sylvania AN-20 Incandescent Induction RF Lamp
Lampe incandescente à induction
HF-Induktions-Glühlampe

Extremely high brightness light source, heated to incandescence by radio frequency induction. It was created in 1955 for the motion picture industries of Hollywood and New York, to increase the speed of printing projection films for circulation to cinemas around the world.

The light source is a refractory target of tantalum carbide, supported on a zirconia tube to minimise heat loss. An externally-applied RF field is focussed onto the target by a copper cylinder, which is water-cooled via copper pipes sealed through the base posts of the lamp.

Frequency: approx. 4 MHz
Luminous flux: 5,000 lumens
Luminance: 54,000,000 cd/m²
Lifetime: 75 hours

• U.S. Patent US2966601 - Induction Lamp
• U.S. Patent US2774905 - Induction Lamp
• U.S. Patent US2776391 - Induction Lamp
• U.S. Patent US2803774 - Induction Lamp
• U.S. Patent US2842698 - Induction Lamp
• U.S. Patent US2948826 - Induction Lamp

More info on the excellent site of J.D. Hooker, The Museum of Electric Lamp Technology.

 

Hauteur • Height • Höhe : 24,5 cm • 9" 5/8
Diamètre • Diameter • Durchmesser : 64 mm • 2" 1/2

Advertisement in SCIENTIFIC AMERICAN, October 1956

 

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