Apparatus for irradiating substances curable by radiation
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United States of America Patent
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-
Nov 3, 1981
Grant Date -
N/A
app pub date -
Jan 8, 1979
filing date -
Jan 23, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for irradiating substances curable by radiation comprises a lamp the emitted radiation of which includes both the UVA or near-UVA spectral range required for the curing and spectral ranges outside these useful ranges. A glass substrate surrounding the lamp has an ellipsoidal concave surface carrying a thin-film filter which reflects only the useful radiation but transmits the undesired spectral ranges, particularly the major portion of the visible light and the thermal radiation. When the power consumption of the lamp decreases as a result of clustering of the filament, the power supply is periodically interrupted thereby producing a flashing signal to warn the user.
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