Extended microwave powered lamp

Patent metadata

Field	Value
Publication number	US-10879059-B2
Application number	US-201414776121-A
Country	US
Kind code	B2
Filing date	Mar 14, 2014
Priority date	Mar 15, 2013
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

An elongated microwave powered lamp (1) having one or more bulbs with any length or shape or disposition according to a linear series, straight or curved, includes: at least one transparent elongated bulb (2) containing, in an inner space thereof, a material apt to be excited by microwave irradiation thereby emitting an electromagnetic radiation; a coaxial microwave antenna placed outside the bulb (2) and respectively connected to a microwave source (81) via corresponding antenna lead (91), said bulb (2) and said at least one microwave coaxial antenna being displaced in a close relationship to each other to allow the microwave excitation of said material, wherein the outer tubular conductor of the coaxial antenna (5) has spaced holes (6) formed therethrough and facing the bulb (2), at which microwaves are released toward the bulb.

First claim

The invention claimed is:

1. An elongated microwave powered lamp ( 1 ) comprising:
at least one transparent elongated bulb ( 2 ) containing, in an inner space thereof, a material apt to be excited excitable by microwave irradiation to generate a plasma, thereby emitting an electromagnetic radiation;
a coaxial microwave antenna ( 5 ), placed in an outer space with respect to the bulb ( 2 ), respectively connected to a microwave source ( 81 ) via corresponding antenna lead ( 91 ), the coaxial antenna being a flexible coaxial cable that is bendable or able to be curved, to conform to an outer profile of the bulb ( 2 ) having an inner wire conductor and a tubular outer conductor separated by a dielectric material, said bulb ( 2 ) and said at least one microwave coaxial antenna ( 5 ) being displaced in a dose relationship to each other to allow the microwave excitation of said material, wherein said tubular outer conductor has spaced holes ( 6 ) facing the bulb ( 2 ) formed in said coaxial cable outer conductor, at which microwaves are released toward the bulb, wherein the holes ( 6 ) are annular ports evenly distributed along the length of the bulb, the annular ports configured to evenly distribute microwave irradiation to irradiate the entire bulb ( 2 ) in a uniform manner, regardless of the length or shape of the bulb ( 2 ).

2. The elongated microwave powered lamp ( 1 ) according to claim 1 , wherein said at least one bulb ( 2 ) has a tubular and symmetrical shape along the longitudinal axis thereof.

3. The elongated microwave powered lamp ( 1 ) according to claim 2 , wherein said at least one bulb ( 2 ) is shaped so as to form a coaxial passing through open channel ( 4 ) extending end-to-end inside the bulb ( 2 ) from one bulb end ( 21 ) to the other ( 22 ), the open channel ( 4 ) having two opposite channel end apertures ( 41 , 42 ) at said opposite respective ends ( 21 , 22 ) of the bulb ( 2 ), said antenna being inserted inside the open channel ( 4 ).

4. The elongated microwave powered lamp ( 1 ) according to claim 1 , wherein said at least one bulb ( 2 ) is shaped so as to form a coaxial passing through open channel ( 4 ) extending end-to-end inside the bulb ( 2 ) from one bulb end ( 21 ) to the other ( 22 ), the open channel ( 4 ) having two opposite channel end apertures ( 41 , 42 ) at said opposite respective ends ( 21 , 22 ) of the bulb ( 2 ), said antenna being inserted inside the open channel ( 4 ).

5. The elongated microwave powered lamp ( 1 ) according to claim 1 , comprising more than one bulb ( 2 ) put in series to form a linear succession of bulbs ( 2 ) irradiated by said antenna ( 5 ).

6. The elongated microwave powered lamp ( 1 ) according to claim 5 , wherein the bulbs ( 2 ) have different lighting characteristics, selected from the group consisting of: colors, shapes, and lengths.

7. The elongated microwave powered lamp ( 1 ) according to claim 1 , wherein said at least one bulb ( 2 ) is bent or curved, the coaxial antenna ( 5 ) being formed and shaped so as to follow the bulb profile, keeping the holes 6 adjacent to the bulb ( 2 ) and facing thereto.

8. The elongated microwave powered lamp of claim 1 , wherein the lamp produces at least one of a: visible, UV, or IR radiation that is either pulsed or continuous.

9. The elongated microwave powered lamp of claim 8 , wherein the radiation is within either a spectral or wide band wavelength range, having uniform high lighting or heating powers.

10. The elongated microwave powered lamp of claim 8 , wherein the type of radiation produced by varying power and wavelength of the generated microwaves, which are then transmitted through said coaxial antenna.

11. The elongated microwave powered lamp of claim 8 , wherein the type of radiation produced is a line spectrum, a band spectrum or mixed spectrum, in a varying range of wavelengths.

12. The elongated microwave powered lamp of claim 11 , wherein a spectral composition of the radiation emitted is variable based on the type of substances used for filling the bulb, a quantity ratio thereof, and is also dependent on a power and a frequency of the microwaves used for excitation.

Assignees

• Consiglio Nazionale Ricerche

Inventors

• Ferrari Carlo
• Longo Iginio

Classifications

• H01J61/94

  Paths producing light of different wavelengths, e.g. for simulating daylight · CPC title

• H01J65/044 Primary

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