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Rauland Zenith Aluminizing
November 1953 Radio-Electronics

November 1953 Radio-Electronics

November 1953 Radio-Electronics Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Electronics, published 1930-1988. All copyrights hereby acknowledged.

Rauland (aka Rauland-Borg) has today on its History webpage that it was founded in 1922 as the Rauland Company, by inventor and radio enthusiast E. Norman Rauland. Soon thereafter he became a pioneer in the radio broadcast industry by launching the Chicago-based radio station, WENR (which eventually became the well-known WLS). In 1941 Norm Rauland and George Borg entered a partnership, and a year later acquired Baird Television of America. Rauland developed cathode ray tubes (CRT) and became an important supplier of communications and radar equipment during WWII. After the war, Rauland began manufacturing CRTs for 10" and 12" televisions. They were so successful that in 1948, Zenith Radio Corporation purchased them to get the CRT technology. This circa 1953 Rauland advertisement ran in Radio-Electronics magazine to pitch their breakthrough aluminizing process that produced CRTs with brighter pictures and greater contrast with relatively low anode voltages, which was a big deal at the time due to concern over high levels of x-rays being emitted. In the 1960s, the newfangled color television sets experienced a rebirth of the problem as beam currents were even higher.

See The Color TV X-Ray Problem, and TV X-Rays, TV X-Rays Are Back, and Whap - You're X-Rayed.

Rauland Zenith Aluminizing Ad

Rauland Zenith Aluminizing, November 1953 Radio-Electronics - RF CafeWhat Aluminizing means

Aluminizing means the efficient use of light - light is energy - energy is the pay-off.

Aluminizing means a brighter TV picture, greater contrast, lower beam current, smaller spot size, sharper focus, reduced screen scorch - all from the efficient use of light.

On the inside of any TV tube face is a coating of phosphor crystals - the picture screen. As the electron beam - tracing the picture - strikes these crystals, they glow, giving off light in all directions. And there's the problem! Half the light thus generated inside the tube, either lost to usefulness or lighting areas that should be dark. Both brightness and contrast suffer.

But- put a mirror behind the phosphor and "wandering" light is reflected back through the tube face. Aluminizing creates this desired mirror!

To aluminize a picture tube, deposit a nitrocellulose film evenly over the phosphor. Over that, deposit a film of aluminum only millionths of an inch thick - just thick enough to reflect the light and just thin enough to let the electrons pass through. Under heat, evaporate the nitrocellulose film to leave a think smooth coating of aluminum. Result - an efficient light reflecting mirror to specifications.

Simple as it sound, Rauland research engineers worked for three years to solve the problem and were among the first to do so.


Perfection through Research

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Posted October 1, 2020

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