Uvc/Vuv Dielectric Barrier Discharge Lamp with Reflector

• US 20080061667A1
• Filed: 07/05/2005
• Published: 03/13/2008
• Est. Priority Date: 07/09/2004
• Status: Active Grant

• Current Assignee: Philips Lighting Holding BV (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Juestel, Thomas, Greuel, Georg, Schiene, Wolfgang, Gaertner, Georg Friedrich
• Granted Patent: US 7,687,997 B2
• Time in Patent Office: Days
• US Class Current: 313/113
• CPC Class Codes: H01J 61/045 Thermic screens or reflectors heat-reflecting coatings on the wall of the vessel H01J61/35
• CPC Class Codes: H01J 61/35 provided with coatings on the walls thereof; Selection of materials for the coatings using coloured coatings H01J61/40; using luminescent coatings H01J61/42
• CPC Class Codes: H01J 65/00 Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
• CPC Class Codes: H01J 65/046 the field being produced by using capacitive means around the vessel

Abstract

The subject of the present invention relates to a high efficiently dielectric barrier discharge (DBD) -lamp for generating and/or emitting a radiation of ultraviolet (UV)-light comprising: a discharge gap (1) being at least partly formed and/or surrounded by at least an inner wall (2) and an at least partly transparent (3), each with an inner surface (2a, 3a), facing the discharge gap (1) and an outer surface (2b, 3b) arranged opposite of and directed away from the corresponding inner surface (2a, 3a), a filling located inside the discharge gap (1), at least two electrical contacting means (4), a first electrical contacting means (4a) at the inner wall (2) and a second electrical contacting means (4b) at the outer wall (3), and at least one luminescent coating layer (5) arranged at/on and at least partly covering at least a part of the respective wall'"'"'s inner surface (3a), arranged such, that at least a part of the generated UV-light of a certain wavelength range can pass the luminescent coating layer (5) from the discharge gap (1) to the outside of the DBD-lamp, whereby at least one of both walls (2, 3) is at least partly arranged with directing means (6), so that the diffusive radiation is directed in direction through the transparent part of the outer wall (3) with reduced losses due to absorption effects and the like.

Claims

1. Highly efficient dielectric barrier discharge (DBD) lamp for generating and emitting an ultraviolet radiation comprising:

a discharge gap (1) being at least partly formed and/or surrounded by

at least an inner wall (2) and

an outer wall (3),

each with an inner surface (2a, 3a), facing the discharge gap (1) and

an outer surface (2b, 3b) arranged opposite of and directed away from the corresponding inner surface (2a, 3a), whereby at least one of the walls is a dielectric wall and/or one of the walls (2, 3) has an at least partly transparent part,

a filling located inside the discharge gap (1),

at least two electrical contacting means (4),

a first electrical contacting means (4a) associated with the outer wall (3) and

a second electrical contacting means (4b) associated with the inner wall (2), and at least one luminescent coating layer (5) arranged at/on and at least partly covering at least a part of the respective wall'"'"'s inner surface (3a), arranged such, that at least a part of the radiation generated by means of a gas discharge inside the discharge gap can pass the luminescent coating layer (5) from the discharge gap (1) to the surrounding of the DBD-lamp, whereby at least one of both walls (2, 3) is at least partly arranged with directing means (6), so that the diffusive radiation, which is generated by means of a gas discharge inside the discharge gap and/or emitted by the luminescent coating layer, is directed in a defined way through at least one of the walls (2, 3) with reduced losses due to absorption effects and the like.

2. High efficiently DBD-lamp according to claim 1, whereby the directing means (6) are arranged as at least one reflecting coating layer (6a), as a reflective, metallic wall, as a reflective, metallic cylinder (7), as a reflective, metallic coating, as a reflective, non-metallic and the like arranged at least partly at the inner wall (2) and/or at the outer wall (3).

3. High efficiently DBD-lamp according to claim 1, whereby the reflecting coating layer (6a) is arranged at/on the inner surface (2a) of the inner wall (2), at/on the inner surface (3a) of the outer wall (3), at least partly at/on the inner surface (2a) of the inner wall (2) and at least partly at/on the inner surface (3a) of the outer wall (3).

4. High efficiently DBD-lamp according to claim 3, whereby the reflecting coating layer (6a) is of a reflective material preferably selected from the group comprising metallic coatings such as Al or Al-alloy or highly reflective ultra fine oxide particle coatings such as SiO₂, MgO, Al₂O₃ or the like.

5. High efficiently DBD-lamp according to claim 3, whereby the reflecting coating layer (6a) is coated by a protective oxide layer (6b).

6. High efficiently DBD-lamp according to claim 1, whereby the reflecting means (6) is arranged at/on the outer surface of the inner wall (2), at/on the outer surface of the outer wall (3), at least partly at/on the outer surface of the inner wall (2) and/or at least partly at/on the outer surface of the outer wall (3).

7. High efficiently DBD-lamp according to claim 1, whereby the lamp geometry is selected from the group comprising a flat lamp geometry, a coaxial lamp geometry, a dome lamp geometry, a planar lamp geometry and the like.

8. High efficiently DBD-lamp according to claim 1, whereby the metallic directing means is arranged as an electrical contacting means for simultaneously reflecting radiation and providing electricity.

9. High efficiently DBD-lamp according to claim 1, whereby the DBD-lamp comprises only one luminescent coating layer (5) at least partly arranged at/on the inner surface of one of the walls (2, 3) and one reflective coating layer at least partly arranged at/on the inner surface of the opposite wall (3, 2).

10. Method for producing a high efficiently DBD-lamp according to claim 1, comprising steps for arranging all parts together.

11. A system incorporating a lamp according to claim 1 and being used in one or more of the following applications:

fluid and/or surface treatment of hard and/or soft surfaces, preferably cleaning, disinfection and/or purification;

liquid disinfection and/or purification,

beverage disinfection and/or purification,

water disinfection and/or purification,

wastewater disinfection and/or purification,

drinking water disinfection and/or purification,

tap water disinfection and/or purification,

production of ultra pure water,

gas disinfection and/or purification,

air disinfection and/or purification,

exhaust gases disinfection and/or purification,

cracking and/or removing of components, preferably anorganic and/or organic compounds

cleaning of semiconductor surfaces,

cracking and/or removing of components from semiconductor surfaces,

cleaning and/or disinfection of food,

cleaning and/or disinfection of food supplements,

cleaning and/or disinfection of pharmaceuticals.