US1990192A - Glow discharge tube for emitting ultraviolet rays - Google Patents
Glow discharge tube for emitting ultraviolet rays Download PDFInfo
- Publication number
- US1990192A US1990192A US566888A US56688831A US1990192A US 1990192 A US1990192 A US 1990192A US 566888 A US566888 A US 566888A US 56688831 A US56688831 A US 56688831A US 1990192 A US1990192 A US 1990192A
- Authority
- US
- United States
- Prior art keywords
- discharge tube
- tube
- ultraviolet rays
- glow discharge
- electrodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000010453 quartz Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 229910052753 mercury Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0064—Tubes with cold main electrodes (including cold cathodes)
Definitions
- the wall of such tubes is made, at least partially, of a material transparent to.
- ultra-violet rays for example of quartz and as a rule the tubes are provided with a filling of vapour, for example of mercury vapour.
- vapour for example of mercury vapour.
- the ultraviolet rays generated by an electric discharge established in this vapour may pass throu'ghthe wall to the outside and be utilized for different purposes.
- such a glow-discharge tube comprises one or more electrodes consisting of gauze so that the rays generated in the tube can easily pass to the outside.
- the metal for example, the mercury, in the vapour of which the discharge has to be established is retained in small drops in the meshes of the gauze-shaped electrodes.
- Figure 1 represents an elevation of this tube
- Figure 2 shows a section taken on the line 2-2
- Figure 3 is a perspective view of the tube.
- the discharge tube represented in the drawing comprises a bulb 1 consisting of quartz and sealed by meansof some intermediary rings 2 to a stem or foot 3 of ordinary glass.
- the composition of the intermediary rings has so been chosen, that the coefficient of expansion of the ring sealed to the quartz bulb 1 is only slightly greater than that of the quartz utilized whereas the coemcients of expansion of the other rings increase according as they are farther remote from the quartz.
- the invention concerns glow-discharge tubes
- the foot 3 carries two electrodes 4 and 5 consisting of concentric cylinders made of'gauze.
- the tube contains some liquid mercury and,- in addition, some argon, for example, at a pressure of some millimetres has been introduced into the tube.
- a suitable tension is applied to the electrodes.
- the stabilizing resistance which has to be connected in series with the discharge path, may be housed, if desired, in the discharge tube or in the cap with which the tube may be provided.
- the cathode glow-discharge established between the electrodes 4 and 5 generates ultra-'- violet rays and which may pass to the outside through the quartz wall 1.
- the discharge tube represented is, for example, suitable for the production of ozone which is formed from the surrounding air by the ultra-violet rays of short wave-length.
- a gaseous electric glow discharge tube comprising an envelope, a gas filling therein comprising a vaporizable metal, a pair of electrodes therein so spaced as to have a cathode glow discharge passed therebetween, said electrodes consisting of concentric gauze cylinders to trap particles of the vaporizable metal and to facilitate the production of a high metal vapor pressure in said tube.
Description
Feb 5, 19356 H, L515 1,990,192
GLOW DISCHARGE TUBE FOR EMITTING ULTRAVIOLET RAYS Filed Oct. 5. 1931 Inventor v Hehdri K Lems,
( HIS Attorney.
Patented Feb. 5, 1935 UNITED STATES GLOW DISCHARGE TUBE FOR EMITTING ULTRAVIOLET nars Hendrik Lems, Eindhoven, Netherlands, assignor to General Electric Company, a corporation of New York Application October 5, 1931, Serial No. 566,88
In Germany October 9, 1930 3 Claims.
for the emission of ultraviolet rays. The wall of such tubes is made, at least partially, of a material transparent to. ultra-violet rays, for example of quartz and as a rule the tubes are provided with a filling of vapour, for example of mercury vapour. Some gas, for example a rare gas, is frequently added to the said filling of vapour. The ultraviolet rays generated by an electric discharge established in this vapour may pass throu'ghthe wall to the outside and be utilized for different purposes.
According to the invention, such a glow-discharge tube comprises one or more electrodes consisting of gauze so that the rays generated in the tube can easily pass to the outside. Besides, the metal, for example, the mercury, in the vapour of which the discharge has to be established is retained in small drops in the meshes of the gauze-shaped electrodes. When the tube starts operating, themetal is consequently rapidly heated so that very soon a vapour pressure of sufiicient value is obtained within the tube.-
A very favourable arrangement is obtained when the electrodes have the shape of concentric cylinders. Owing to this construction the I distribution of the electric field between the electrodes becomes very uniform, which is conductive to a uniiorm light distribution. The rays generated ma emerge from the tube in this case through thetineshes of the electrodes so that no trouble is e eriencedfrom these electrodes. In order that t e invention may be clearly understood and readily carried into eflect, it will be explained more fully with reference to the accompanying drawing which represents, by way of example, a glow-discharge tube according to the invention. In this drawing:
Figure 1 represents an elevation of this tube,
Figure 2 shows a section taken on the line 2-2, and Figure 3 is a perspective view of the tube.
The discharge tube represented in the drawing comprises a bulb 1 consisting of quartz and sealed by meansof some intermediary rings 2 to a stem or foot 3 of ordinary glass. The composition of the intermediary ringshas so been chosen, that the coefficient of expansion of the ring sealed to the quartz bulb 1 is only slightly greater than that of the quartz utilized whereas the coemcients of expansion of the other rings increase according as they are farther remote from the quartz.
The invention concerns glow-discharge tubes The foot 3 carries two electrodes 4 and 5 consisting of concentric cylinders made of'gauze. The tube contains some liquid mercury and,- in addition, some argon, for example, at a pressure of some millimetres has been introduced into the tube. For operating the discharge tube represented, a suitable tension is applied to the electrodes. The stabilizing resistance which has to be connected in series with the discharge path, may be housed, if desired, in the discharge tube or in the cap with which the tube may be provided. The cathode glow-discharge established between the electrodes 4 and 5 generates ultra-'- violet rays and which may pass to the outside through the quartz wall 1. It has been found that part of'the mercury is caught in the meshes of the gauze-shaped electrodes, which facilitates the production of a sufiiciently high pressure of the mercury vapour. The discharge tube represented is, for example, suitable for the production of ozone which is formed from the surrounding air by the ultra-violet rays of short wave-length.
What I claim is:
1. A gaseous electric glow discharge tube comprising an envelope, a gas filling therein comprising a vaporizable metal, a pair of electrodes therein so spaced as to have a cathode glow discharge passed therebetween, said electrodes consisting of concentric gauze cylinders to trap particles of the vaporizable metal and to facilitate the production of a high metal vapor pressure in said tube.
2. A gaseous electricglow'discharge tube com- Y 'therein'so spaced as to have a cathode glow discharge passed therebetween, the mesh of the said gauze electrodes being of a small size to trap drops of the vaporizable metal therein to facilitate the production of a high pressure ofrthe metal vapor in the device.
. HENDRIK LEMS.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1990192X | 1930-10-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1990192A true US1990192A (en) | 1935-02-05 |
Family
ID=7894713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US566888A Expired - Lifetime US1990192A (en) | 1930-10-09 | 1931-10-05 | Glow discharge tube for emitting ultraviolet rays |
Country Status (1)
Country | Link |
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US (1) | US1990192A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4902933A (en) * | 1988-09-20 | 1990-02-20 | General Electric Company | High efficacy discharge lamp having large anodes |
US5905339A (en) * | 1995-12-29 | 1999-05-18 | Philips Electronics North America Corporation | Gas discharge lamp having an electrode with a low heat capacity tip |
-
1931
- 1931-10-05 US US566888A patent/US1990192A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4902933A (en) * | 1988-09-20 | 1990-02-20 | General Electric Company | High efficacy discharge lamp having large anodes |
US5905339A (en) * | 1995-12-29 | 1999-05-18 | Philips Electronics North America Corporation | Gas discharge lamp having an electrode with a low heat capacity tip |
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