Highly efficient UV C bulb with multifaceted filter
A Far UV C excimer bulb assembly including an excimer bulb, and at least two filters. The excimer bulb emits a path of light in at least two wavelengths. The at least two filters remove all wavelengths of light that are hazardous to human tissue. The at least two filters may each be placed perpendicular to the path of the light generated by the excimer bulb. The at least two filters may be a single, curved or cylindrical filter. The assembly may further include a mirror which may also be curved.
1. A Far UV C excimer bulb assembly, comprising;
an excimer bulb which generates beams of light in a plurality of wavelengths substantially comprising far UV C;
at least two filters, wherein said at least two filters are hafnium based filters;
said at least two filters are external to and separated from said excimer bulb;
said at least two filters each having a cut-off wavelength of 234 nm so as to block substantially all UV C wavelengths longer than 234 nm emitted from said excimer bulb; and,
said at least two filters are each oriented perpendicular to a path of the beams of light such that a majority of the light strikes them with an incidence angle of zero degrees.
2. The Far UV C excimer bulb assembly of claim 1 where the said at least two filters are three (3) filters.
3. The Far UV C excimer bulb assembly of claim 1 where the said at least two filters are four (4) filters.
4. The Far UV C excimer bulb assembly of claim 1 further including a mirror external to said excimer bulb.
5. The Far UV C excimer bulb assembly of claim 4 wherein said mirror is curved.
6. The Far UV C excimer bulb assembly of claim 4 wherein said excimer bulb includes an exterior surface and said mirror is plated on said exterior surface of said excimer bulb.
7. The Far UV C excimer bulb assembly of claim 1 wherein said excimer bulb has a translucent face.
8. A Far UV C excimer bulb assembly, comprising:
an excimer bulb which emits far UV C wavelengths of light;
a curved filter external to and separated from said excimer bulb, said curved filter including an arc;
said curved filter being hafnium based;
said curved filter having a cut-off wavelength of 234 nm such that substantially all far UV C wavelengths of light shorter than 234 nm pass through said curved filter and said curved filter blocks substantially all wavelengths of UV C light longer than 234 nm;
said excimer bulb positioned at least partially and centered within said arc so that a majority of said safe-far UV C wavelengths of light pass perpendicularly through said curved filter.
9. The Far UV C excimer bulb assembly of claim 8 wherein said curved filter is a cylinder surrounding said excimer bulb and said excimer bulb is positioned at the center of said cylinder.
10. The Far UV C excimer bulb assembly of claim 8 wherein said curved filter is a semi-cylinder.
11. The Far UV C excimer bulb assembly of claim 10 further includes a mirror external to said excimer bulb.
12. The Far UV C excimer bulb assembly of claim 11 wherein said mirror is curved.
13. The Far UV C excimer bulb assembly of claim 11 where said excimer bulb includes an exterior surface and said mirror is plated on said exterior surface of said excimer bulb.
14. The Far UV C excimer bulb assembly of claim 8 wherein said selected far UV C wavelengths of light which pass perpendicularly through said curved filter are shorter than 234 nm.
15. The Far UV C excimer bulb assembly of claim 8 wherein said excimer bulb has a translucent face.