FIELD: lighting engineering; radiation sources. SUBSTANCE: spiral filament is made of ferromagnetic material. Layer of magnetic powder is applied to glass part of support. Particles of metal separated from luminous element are attracted to support and settle down on its surface. Blackening of bulb is thus prevented. EFFECT: prevention of blackening of bulb. 3 cl, 1 dwg
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|---|---|---|---|
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|
RU2576655C1 |
| ELECTRIC FILAMENT LAMP | 1992 |
|
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| ELECTRIC FILAMENT LAMP | 1992 |
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RU2054744C1 |
