DE591836C - Electric discharge lamp with noble gas base filling and a vaporizable sodium amalgam base, especially for television purposes - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
January 27, 1934

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21 f GROUP 8202

Patented in the German Empire on January 1, 1933

The invention relates to electric discharge lamps with a noble gas base filling and sodium vapors glowing in the plant. Such lamps are because of their good economy and high Luminance with advantage for controlling and transmitting light phenomena and thus used in particular for television purposes. A disadvantage of such sodium vapor lamps

ίο It lies in the fact that they are not always indolent follow the vibrations imposed on them, which results in an occasional Blurring of the outlines of the reproduced image expresses.

The invention is based on the knowledge that this disadvantage of electrical Sodium lamps' can be avoided if the lamp is with one very specific procured sodium amalgam bottom body is equipped, and that must. according to the invention the amount of mercury in the soil does not exceed 10 per cent the operating temperature completely or almost completely evaporating the amount of sodium Soil body amount. They are electric discharge lamps already containing sodium amalgam known. Here, however, the mercury content was always so high that the mercury vapor when the lamps were in operation always predominantly, mostly even exclusively, glowed.

If the lamp is very high loads according to the invention, so that set 400 ⁰ C in excess of operating temperatures, so the added mercury can be less / amount than 1 ° ₀ under certain circumstances. For normal operating temperatures of about 300 ⁰ C, a mercury addition of 4 through 5, preferably / o ° used.

The amount of mercury, which is very small compared to the amount of sodium, can possibly can also be introduced separately into the tube. In this case. Arises after a one-time Use the lamp by condensing the metal fumes by itself creating a sodium amalgam the desired composition.

The amount of mercury used is so small in any case that the yellow sodium radiation not suppressed, but at most through weak co-excitation of the Mercury atoms are lightened somewhat. It therefore also remains the. with the sodium radiation associated good economy and high luminance fully preserved.

The suppression of the described ones caused by the small addition of mercury Inertia is likely to be

*) The patent seeker indicated the following as the inventors:

Dr. Hans Ewest in Berlin-Lichterfelde and Georg Gaidies in Berlin-Pankow.

Hch come about because the higher Series members of the excited mercury atoms and sodium atoms coincide numerically and that consequently also the lower sodium D lines in the visible area / indirect are influenced by the mercury atoms, with a reduction in the afterglow period Prevention of subsequent delivery results.

ίο The discharge lamp according to the invention can also be used with advantage for general lighting, because the low The addition of mercury resulted in the addition of blue and green rays to the yellow sodium ray the latter gives a more pleasant tint to the human eye.

Claims (1)

Claim: Electric. Discharge lamp with a noble gas base filling and a vaporizable one Sodium amalgam soil, in particular for television purposes, characterized in that that the amount of mercury in the body of the soil is not more than 10% of that at the operating temperature the amount of sodium evaporating in the soil is almost entirely.