Ultraviolet systems and methods for irradiating a substrate

Patent metadata

Field	Value
Publication number	US-9502149-B2
Application number	US-201414456062-A
Country	US
Kind code	B2
Filing date	Aug 11, 2014
Priority date	Aug 11, 2014
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A UV system for irradiating a substrate includes a lamphead having an enclosure with an interior. A UV bulb is positioned in the interior and is capable of emitting UV energy when excited by RF energy. The UV system also includes a solid state RF source capable of generating the RF energy. The RF energy is transmitted to the UV bulb, which causes the UV bulb to ignite and emit the UV energy from the interior of the lamphead.

First claim

What is claimed is:

1. A UV system for irradiating a substrate, the system comprising:
a lamphead including an interior;
a plurality of solid state RF sources, each RF source configured to generate RF energy;
an elongated UV bulb having a length and being positioned in said interior of said lamphead and capable of emitting UV energy when excited by the RF energy generated by said plurality of solid state RF sources; and
a plurality of RF transmitters, each one of said plurality of RF transmitters coupled to one of said plurality of solid state RF sources, said plurality of RF transmitters being positioned proximate to said elongated UV bulb and spaced apart along the length of said elongated UV bulb, and said plurality of RF transmitters configured to receive the RF energy from said plurality of solid state RF sources and direct the RF energy to different regions across the length of said elongated UV bulb.

2. The system of claim 1 , wherein said plurality of solid state RF sources are located outside said interior of said lamphead.

3. The system of claim 2 , wherein said plurality of RF transmitter comprise a plurality of antennas, each one of said plurality of antennas being coupled to said one of said plurality of solid state RF sources.

4. The system of claim 3 , further comprising:
a cooling device located outside said interior of said lamphead for directing cooling air at said elongated UV bulb.

5. The system of claim 3 , further comprising:
a cooling device located inside said interior of said lamphead for directing cooling air at said elongated UV bulb.

6. The system of claim 1 , wherein said plurality of solid state RF sources are located inside said interior of said lamphead.

7. The system of claim 6 , further comprising wherein each of said plurality of RF transmitters comprises a plurality of antennas, each one of said plurality of antennas being coupled to one of said plurality of solid state RF sources.

8. The system of claim 7 , further comprising:
a cooling device located outside said interior of said lamphead for directing cooling air at said elongated UV bulb.

9. The system of claim 7 , further comprising:
a cooling device located inside said interior of said lamphead for directing cooling air at said elongated UV bulb.

10. The system of claim 6 , wherein each said RF transmitter further comprises one or a plurality of waveguides.

11. The system of claim 2 , further comprising a controller for sending at least one control signal respectively to each one of said plurality of solid state RF sources, each said control signal defining a frequency for the RF energy generated by a respective one of said solid state RF source.

12. The system of claim 6 , further comprising a controller for sending at least one control signal respectively to each one of said solid state RF sources, each said control signal defining a frequency for the RF energy generated by the respective one of said solid state RF source.

13. A method of irradiating a substrate with UV energy from an elongated UV bulb positioned within a lamphead, the method comprising:
generating a first data signal defining a desired frequency;
receiving the first data signal at a first one of a plurality of solid state RF sources;
generating RF energy having the desired frequency with the first one of the plurality of solid state RF sources receiving the first data signal;
receiving the generated RF energy having the desired frequency with a first one of the plurality of RF transmitters arranged along a length of the elongated UV bulb;
directing the received RF energy from the first one of the plurality of RF transmitters to a first portion of the elongated UV bulb positioned within the lamphead;
generating a second data signal defining the desired frequency;
receiving the second data signal at a second one of the plurality of solid state RF sources;
generating RF energy having the desired frequency with the second one of the plurality of solid state RF sources;
receiving the generated RF energy having the desired frequency with a second one of the plurality of RF transmitters arranged along the length of the elongated UV bulb;
directing the received RF energy from the second one of the plurality of RF transmitters to a second portion of the elongated UV bulb positioned within the lamphead;
igniting the elongated UV bulb with the generated RF energy;
generating UV energy from the ignited elongated UV bulb;
directing the UV energy out of the lamphead and towards the substrate; and
irradiating the substrate with the UV energy.

14. The system of claim 1 , wherein said plurality of RF transmitters are positioned in said interior of said lamphead.

15. The system of claim 1 , further comprising a faraday cage that includes said plurality of solid state RF sources.

16. The method of claim 13 , wherein said plurality of RF transmitters are positioned in said interior of said lamphead.

Assignees

• Nordson Corp

Inventors

• Borsuk James M
• Harrell Gregory W
• Khoury James M
• Mcghee Edward C
• Smith James C
• Smith-Petee Hallie

Classifications

• H01J65/044 Primary

  the field being produced by a separate microwave unit · CPC title

• H05B41/24

  in which the lamp is fed by high frequency AC {, or with separate oscillator frequency} (H05B41/26 takes precedence) · CPC title

• G21K1/00

  Arrangements for handling particles or ionising radiation, e.g. focusing or moderating · CPC title

• G21K5/04 Primary

  with beam-forming means · CPC title

• H05B41/2806 Primary

  with semiconductor devices and specially adapted for lamps without electrodes in the vessel, e.g. surface discharge lamps, electrodeless discharge lamps · CPC title