SU1749950A1 - Combined-radiation low-pressure gaseous discharge lamp - Google Patents

Abstract

Use: in the manufacture of gas discharge lamps, in particular compact low pressure with combined bactericidal and erythemal radiation. SUMMARY OF THE INVENTION: The flask is made of bactericidal glass, filled with mercury vapor and inert gas, and has two electrode assemblies. The phosphor emitting in the wavelength range of 280-320 nm is deposited on a part of the surface of the tube-flask, leaving two annular areas free from it, located at a distance of 1.6-1.9 of the outer diameter of the tube from the corresponding end of the flask from the side of the electrode. The length of each section is 1 / 6-1 / 5 of the length of the bulb. 1 il. yo

Description

The invention relates to the electrical industry and can be used in the manufacture of gas discharge lamps, in particular compact low pressure with a combination of bactericidal and erythemal radiation.

Fluorescent lamps with a combined concentrated flux of radiation are known. The lamp consists of a tubular bulb, on both ends of which electrodes are located, the tubular bulb is coated with phosphor, which converts A 254 nm radiation to A 280 nm radiation, and is opaque to the lamp's radiation. In the phosphor layer, there is a light window located in the middle of the tube-bulb and

having a round shape with a diameter of 0.1-0.7 outer diameter of a tubular bulb. Up to 90% of the lamp emission passes through the window. The phosphor layer has such a thickness that the degree of conversion of primary radiation at a wavelength of 254 nm into secondary radiation with a wavelength of A 3: 280 nm does not increase significantly with a further increase in the thickness of this layer.

This lamp is a compact source with a concentrated radiation flux of improved spectral composition, but it has the following drawbacks: the efficiency of using radiation is low and the XI is limited

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lamp application area (with devices that analyze nondispersive gas), low radiant lamp output due to power losses for multiple reflections inside an opaque tube for radiation and radiation output through a small light window with a diameter of 0.1-0.7 outer diameter of the tube-bulb, - high quality technological requirements for the quality of the glass of the light window with a transmittance of at least 90%, the need for precise control of the thickness of the phosphor layer, a change which leads to a violation of the ratio of the primary I zlucheni to 254 nm and a secondary I 280 nm.

The closest to the technical essence of the present invention is a low-pressure gas discharge lamp, generating bactericidal and erythemal radiation.

The lamp tube is made of glass that transmits short-wave ultraviolet (UV) radiation in quantities for 254 nm 70% and for 185 nm 20%. The lamp is filled with inert gas and mercury vapor and contains at least two electrodes at the ends of the lamp. A visible phosphor is deposited on the inner surface of the tubular bulb, the layer thickness of which is such that it transmits up to 65% of visible radiation and provides a ratio of short-wave bactericidal and erythemal radiation of less than 1.5.

This lamp generates a combination of (bactericidal and erythemal) radiation, but it has the following disadvantages: increased demands on the quality of the glass (the bulb of the lamp must be made of glass with a high transmittance coefficient K -254 70%), the need for precise technological control over the thickness the phosphor layer, which changes leads to a violation of the ratio of the bactericidal and erythemal fluxes of the lamp (less than 1.5), the limited use of the source for local (local) radiation due to EFINITIONS radiant luminance along flask imeyushih form an elongated tube in the space.

The aim of the invention is to increase the biological efficiency, save materials and improve the manufacturability of manufacturing a compact low pressure discharge lamp with a combined radiation.

This goal is achieved by the fact that in a compact low-pressure discharge lamp with a combined radiation containing a phosphor deposited on. a portion of the surface of the flask, leaving two annular portions free from it, each located at a distance from the respective electrode, 1.6-1.9 times the outer diameter of the flask, and having a length of 1 / 6-1 / 5 the length of the flask.

0 The drawing shows a compact gas discharge low-pressure lamp with a combined radiation.

The lamp consists of a tubular flask 1 of bactericidal glass, including two

5 parallel tubes connected by a hollow jumper 2. Phosphor 3 is applied to the inner surface of the tubular bulb, radiating in the 280-320 nm wavelength range, leaving two circular sections, each at a distance from the corresponding end of the bulb from the electrode, 1.6-1.9 times the outer diameter of the flask, and having a length of 1 / 6-1 / 5 length

5 flasks. Phosphor 3 is deposited on (4 / 5-5 / 6) the length of the tubular bulb, including section 4, located at a distance of 1.6-1.9 of the outer diameter of the flask. The ends of the flask 1 are hermetically sealed with the feet 5, in conclusions 6

0 of which electrodes 7 are mounted. The annular region 8 is free of phosphor and has a length of 1 / 6-1 / 5 of the bulb length. The lamp is filled with mercury vapor and inert gas (or a mixture of inert gases).

5 When a lamp is applied to a tube in a bulb, a low pressure electrical discharge arises, causing resonant radiation of mercury at a wavelength of 185 and 254 nm. This radiation excites the phosphor,

0 emitting in the wavelength range of 280-320 nm, and deposited on areas of 4 / 5-5 / 6 flask length. The resonant radiation of mercury at a wavelength of 185 nm is not transmitted through the glass of the tube-bulb, and the wavelength

5 nm has a direct output through sections 8, free from phosphor and adjacent to the electrode discharge.

The width of the sections 8 is inversely proportional to the transmittance and the thickness of the glass. This relationship is described by the formula

Ig Ki + 0. 035

igr /,

du

- Oh, 035,

where TP - the transmittance of the glass lamp;

gi is the transmittance of commercially available bactericidal glass; dfl is the glass thickness of the lamp;

d4 is the thickness of commercially available bactericidal glass (0.7-0.9 mm);

0.035 - correction for reflection from two surfaces of the wall of the tubular lamp bulb for A-254 nm.

The given mathematical relationship shows that the transmission coefficient of bactericidal glass for I is 254 nm with a change in its thickness of +0.25 mm changes by 20%. In this case, dispersion compensation is possible by changing the length of sections 8 of the bulb free from the phosphor, ranging from 1/6 and 1/5 of the length of the bulb. Consequently, a phosphor emitting in the wavelength range of 280-320 nm should cover 4/5 to 5/6 of the lamp length, including the portion located at a distance of 1.6 to 1.9 of the outer diameter of the bulb.

At a distance from the base of less than 1.6-1.9 of the outer diameter of the bulb at the ends of the lamp, there are weak and unevenly radiating discharge areas with a low energy conversion factor.

radiation - sunset region, negative effect on the cathode and Faraday dark space.

Claims (1)

Invention Formula Low gas discharge lamp with a combined radiation, containing a tubular flask with two electrodes, made of bactericidal glass, coated with a phosphor emitting in spectral region of 280–320 nm, filled with mercury vapor and an inert gas, which, in order to increase its biological efficiency, save materials and increase manufacturability, the phosphor is deposited on a part of the flask surface, leaving two annular areas free from it, each spaced from the corresponding end of the flask on the electrode side, from 1.6 to 1.9 of the outer diameter of the flask and having a length of from 1/6 to 1/5 the length of the flask.