US2237123A - Electric discharge tube comprising a fluorescent screen - Google Patents
Electric discharge tube comprising a fluorescent screen Download PDFInfo
- Publication number
- US2237123A US2237123A US238318A US23831838A US2237123A US 2237123 A US2237123 A US 2237123A US 238318 A US238318 A US 238318A US 23831838 A US23831838 A US 23831838A US 2237123 A US2237123 A US 2237123A
- Authority
- US
- United States
- Prior art keywords
- rhodium
- fluorescent screen
- layer
- discharge tube
- electric discharge
- 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
- 229910052703 rhodium Inorganic materials 0.000 description 15
- 239000010948 rhodium Substances 0.000 description 15
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 15
- 239000000463 material Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 150000002739 metals Chemical class 0.000 description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 241000282342 Martes americana Species 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- -1 tantalium Chemical compound 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/28—Luminescent screens with protective, conductive or reflective layers
Definitions
- This invention relates to an electric discharge tube comprising a fluorescent screen which consists of a transparent support to which is applied a layer of fluorescent material and on which a layer of metal having a melting point of more than 1800 C. is provided either on the fluorescent material or between the support and the fluorescent material, according to copending United States patent application No. 39,798, filed September 9, 1935, by De Boer et al. for Fluorescent screens.
- rhodium has the important advantage over the other metals entering into ac,- count, whose melting points exceed 1800 C., that it does not oxidise in the air, so that in contradistinction, for instance, to the use of tungsten, molybdenum and similar metals the screen, when using rhodium, can be exposed to the air after manufacture without there being a risk of a decrease in conductivity of these layers.
- a support surface I which may, for example, be the glass wall of a cathode ray tube, has deposited thereon a thin substantially monatomic layer 3 of rhodium.
- a thin substantially monatomic layer 3 of rhodium On the layer of rhodium are shown the particles of fluorescent material 5.
- the rhodium layer provides the necessary conductivity to insure that the screen operates efiiciently.
- rhodium is entirely devoid of these properties, so that the use of this metal ofiers material advantages over theme of the other metals referred to above. is not necessary to take a large number of precautions after the layer has been applied and secondly it is not necessary to apply the layer in an exhausted space. It will be appreciated that owing thereto rhodium exhibits a very particular effect with respect to the other metals, which would enter into account for use as a conductive material according to the above United States patent application Serial' No. 39,798.
- a fluorescent screen comprising a smooth transparent support, a highly transparent layer of rhodium deposited thereon, and luminescent material deposited upon the layer of rhodium.
- a fluorescent screen comprising a smooth transparent support structure, a low light absorbing layer of rhodium deposited upon the transparent support structure and a layer of luminescent material deposited upon the layer of rhodium.
- a luminescent screen comprising a smooth transparent support structure, a layer of luminescent material, and a highly transparent layer of rhodium interposed between the support structure and the fluorescent material.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
M. C. TEVES April 1, 1941.
ELECTRIC DISCHARGE TUBE COMPRISING A FLUORESCENT SCREEN Filed Nov. 2, 1958 INVENTOR MARTEN C. TEl/ES ATZI'ORNEY Patented Apr. 1, 1941 ELECTRIG DISCHARGE TUBE COMPRISING. A FLUORESCENT SCREEN Marten Cornelis 'i'eves, Eindhoven, Netherlands,
assignor, by mesne assignments, to Radio Corporation of America, New York, N. Y., a corporation of Delaware Application November 2, 1938, Serial No. 238,318 In the Netherlands August 7, 1937 3 Claims.
This invention relates to an electric discharge tube comprising a fluorescent screen which consists of a transparent support to which is applied a layer of fluorescent material and on which a layer of metal having a melting point of more than 1800 C. is provided either on the fluorescent material or between the support and the fluorescent material, according to copending United States patent application No. 39,798, filed September 9, 1935, by De Boer et al. for Fluorescent screens.
In the principal application it has been set out that it is very advantageous to use for these conductive layers metals having a high melting point, since these are endowed of the property that even very thin layers of them have a slight absorption of light and yet fairly high conductivity. The invention under view concerns an improvement of the invention disclosed in the principal application and resides in that use is made of a fluorescent screen in which the conductive layer on the fluorescent material or between this material and the substratum consist of rhodium. In fact, rhodium has the important advantage over the other metals entering into ac,- count, whose melting points exceed 1800 C., that it does not oxidise in the air, so that in contradistinction, for instance, to the use of tungsten, molybdenum and similar metals the screen, when using rhodium, can be exposed to the air after manufacture without there being a risk of a decrease in conductivity of these layers.
In describing the invention, reference will be made to the drawing Where there is shown schematically and not to scale in cross-section a fluorescent screen embodying the invention. In the drawing, a support surface I, which may, for example, be the glass wall of a cathode ray tube, has deposited thereon a thin substantially monatomic layer 3 of rhodium. On the layer of rhodium are shown the particles of fluorescent material 5. The rhodium layer provides the necessary conductivity to insure that the screen operates efiiciently.
Indeed, when considering what metals enter into account for use as a conductive material according to the above U. S. patent application Serial No. 39,798, we find, besides rhodium, for instance tungsten, tantalium, molybdenum, boron, hafnium, osmium, iridium and thorium. These metals can be precipitated in very thin layers by vaporisation in a vacuum or applied by so-called cathodic disintegration. With the metals entering first of all into account such as tungsten and molybdenum much care has to be taken that the layers formed do not contact with oxygen, since they would immediately oxidise in this case and areno longer suitable for the purpose aimed at. However, rhodium is entirely devoid of these properties, so that the use of this metal ofiers material advantages over theme of the other metals referred to above. is not necessary to take a large number of precautions after the layer has been applied and secondly it is not necessary to apply the layer in an exhausted space. It will be appreciated that owing thereto rhodium exhibits a very particular effect with respect to the other metals, which would enter into account for use as a conductive material according to the above United States patent application Serial' No. 39,798.
Furthermore, it has been found that rhodium eminently adheres to glass and in addition is entirely resistant to the binders and solvents usedfor fluorescent screens.
What I claim is:
1. A fluorescent screen comprising a smooth transparent support, a highly transparent layer of rhodium deposited thereon, and luminescent material deposited upon the layer of rhodium.
2. A fluorescent screen comprising a smooth transparent support structure, a low light absorbing layer of rhodium deposited upon the transparent support structure and a layer of luminescent material deposited upon the layer of rhodium.
3. A luminescent screen comprising a smooth transparent support structure, a layer of luminescent material, and a highly transparent layer of rhodium interposed between the support structure and the fluorescent material.
MARTEN CORNELIS TEVES.
Firstly it i
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2237123X | 1937-08-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2237123A true US2237123A (en) | 1941-04-01 |
Family
ID=19873937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US238318A Expired - Lifetime US2237123A (en) | 1937-08-07 | 1938-11-02 | Electric discharge tube comprising a fluorescent screen |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2237123A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2427592A (en) * | 1943-07-31 | 1947-09-16 | Rca Corp | Thorium compound protective coatings for reflecting surfaces |
| US2699511A (en) * | 1951-05-04 | 1955-01-11 | Sheldon Edward Emanuel | Storage tube for invisible radiation |
-
1938
- 1938-11-02 US US238318A patent/US2237123A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2427592A (en) * | 1943-07-31 | 1947-09-16 | Rca Corp | Thorium compound protective coatings for reflecting surfaces |
| US2699511A (en) * | 1951-05-04 | 1955-01-11 | Sheldon Edward Emanuel | Storage tube for invisible radiation |
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