Publication Date: 2003-Jan-09
The IP.com Prior Art Database
HID-lamp ignition properties are advantageously influenced by the use of a UV- enhancer (UVE).
The use of a separate UV-enhancer reqiures separate mounting of an additional component inside the outer bulb of the lamp, whilst optimizing the capacitive coupling between the UV-enhancer electrode and a lamp current supply conductor is difficult.
In case of a HID-lamp having a ceramic discharge vessel integration of the UVE with the ceramic discharge vessel appears possible, which solves the problems above described. The construction of the discharge vessel is shown in the accompanying figure.
If the used ceramic is PCA, the properties of PCA offer the opportunity to do this in several ways:
· Transparent PCA allows guiding UV from the UVE chamber to the burner.
· Translucent PCA has luminescent properties. Thus it is suitable to make a mercury‑free UVE chambers (e.g. Ar filling) The UV originating from a capacitive Ar discharge then triggers the PCA luminescence.
Preferably an antenna is applied around the UVE, This can be:
· metal wire antenna,
· conductive foil deposited on the DGA and contacted in some way,
· sintered on antenna