US3609438A - Electron gun with nickel grid plate and copper-nickel alloy grid cylinder - Google Patents
Electron gun with nickel grid plate and copper-nickel alloy grid cylinder Download PDFInfo
- Publication number
- US3609438A US3609438A US34650A US3609438DA US3609438A US 3609438 A US3609438 A US 3609438A US 34650 A US34650 A US 34650A US 3609438D A US3609438D A US 3609438DA US 3609438 A US3609438 A US 3609438A
- Authority
- US
- United States
- Prior art keywords
- nickel
- copper
- plate
- electron gun
- cylinder
- 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
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 14
- 239000000956 alloy Substances 0.000 title claims abstract description 14
- 229910000570 Cupronickel Inorganic materials 0.000 title claims abstract description 10
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 title claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
- H01J3/02—Electron guns
- H01J3/027—Construction of the gun or parts thereof
Definitions
- Trifari ABSTRACT An electron gun the first perforated electrode of which, which surrounds the cathode, consists of a perforated plate of nickel which is secured to a cylinder consisting of a copper-nickel alloy. (FIG. 3.)
- the invention relates to an electron gun consisting of a cathode opposite to which a metal plate is provided, which plate comprises one or several apertures for passing an electron current and is secured to a metal cylinder.
- An electron gun is known from the U.S. Pat. No. 2,468,136 in which the deformation of the plate serving as a first grid is avoided in that the plate is soldered to a metallized surface of a graphite cylinder by means of nickel-, molybdenumor platinum solder.
- the use of graphite is less desirable, since dust particles can be liberated thereby in the tube and the degasing will take a long time.
- the plate consists of nickel and the cylindrical part consists of a copper-nickel alloy.
- This alloy may contain from 40 to 75 percent by weight of nickel, but preferably an alloy is used of 55 percent by weight of copper and 45 percent by weight of nickel.
- the plate may be soldered to the cylinder, for example, by means of silver or be secured thereto by means of welding or diffusion. It has surprisingly been found that a nickel plate in a thickness of less than 200 p. remains entirely flat in the said combination of the materials.
- FIG. 1 is a cross-sectional view of a known embodiment of an electron gun after the heating
- FIG. 2 is a cross-sectional view of a Wehnelt cylinder of another known construction
- FIG. 3 is a cross-sectional view of a particular embodiment of an electron gun according to the invention.
- Reference numeral 1 in FIG. 1 denotes the cathode support comprising the emitting layer 2 and a heater member 3.
- the Wehnelt electrode consists of a perforated plate 4 which is secured to a supporting cylinder 5.
- the plate 4 and the cylinder 5 consist both of chromium-nickel steel.
- the perforated plate 9 consists of nickel, the supporting cylinder 8 of a copper-nickel alloy with 55 percent by weight of copper and 45 percent by weight of nickel.
- the plate 9 is soldered to the cylinder 8 by means of silver.
- the plate 9 also comprises a circumferential groove 6.
- the groove 6 is from the scope of the present invention.
- An electron gun comprising a cathode opposite to which is placed a metal plate having at least one aperture for passing an electron current, which plate comprises a circumferential strengthening groove and is secured to a metal cylinder, characterized in that the perforated plate consists of nickel having a thickness less than 200 p. and the cylinder consists of a suitable copper-nickel alloy.
- An electron gun as claimed in claim 1 characterized in that the cylinder consists of an alloy of 55 percent by weight of copper and 45 percent by weight of nickel.
Landscapes
- Solid Thermionic Cathode (AREA)
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
Abstract
An electron gun the first perforated electrode of which, which surrounds the cathode, consists of a perforated plate of nickel which is secured to a cylinder consisting of a copper-nickel alloy. (FIG. 3.
Description
United States Patent Johannes Van Esdonk; Johannes Petrus Hornman, both of Emmasingel, Eindoven, Netherlands Inventors Appl. No. 34,650
Filed May 5, 1970 Patented Sept. 28, 1971 Assignee U.S. Philips Corp.
New York, N.Y.
Priority May 24, 1969 Netherlands 6908004 ELECTRON GUN WITH NICKEL GRID PLATE AND COPPER-NICKEL ALLOY GRID CYLINDER 3 Claims, 3 Drawing Figs.
U.S. Cl 313/311, 313/270 lnt.Cl H0lj 1/14, HOlj 1/48,H0lj 19/06 Field of Search 313/270,
lllnlllllll 'IIIIIII [56] References Cited UNITED STATES PATENTS 2,244,358 6/1941 Ewald 313/270 X 2,386,790 10/1945 Gaun et al. 313/270 X 2,393,057 1/1946 O'Larte et al... 313/85 2,431,137 11/1947 OLarte et a1 313/270X 2,468,136 4/1949 Taylor 313/356 2,611,676 9/1952 Pohle 316/23 Primary Examiner-David Schonberg Assistant Examiner-Toby H. Kusmer Attorney-Frank R. Trifari ABSTRACT: An electron gun the first perforated electrode of which, which surrounds the cathode, consists of a perforated plate of nickel which is secured to a cylinder consisting of a copper-nickel alloy. (FIG. 3.)
VIII/III)! VI/ II/IIIlI/IIII'I/l PATENTED SEP28 19?] INVENTORS JOHANNES VAN ESDONK JOHANNES P. HORNMAN BY 2M AGENT ELECTRON GUN WlTl-l NICKEL GRID PLATE AND COPPER-NICKEL ALLOY GRID CYLINDER The invention relates to an electron gun consisting of a cathode opposite to which a metal plate is provided, which plate comprises one or several apertures for passing an electron current and is secured to a metal cylinder.
It is found that upon heating during the formation of the cathode, the perforated plate often warps at the area of the perforation so that the distance from the perforation to the cathode surface changes. This is a drawback in particular if the distance between the cathode an the plate is very small (approximately I 4,). In such electron guns the permitted deviation usually is approximately percent, so :5 1., as is described also in U.S. Pat. No. 2,61 1,676, column 1, line 13.
An electron gun is known from the U.S. Pat. No. 2,468,136 in which the deformation of the plate serving as a first grid is avoided in that the plate is soldered to a metallized surface of a graphite cylinder by means of nickel-, molybdenumor platinum solder. However, the use of graphite is less desirable, since dust particles can be liberated thereby in the tube and the degasing will take a long time.
Furthermore it is known to provide a thin plate with a circumferential strengthening groove as is described in U.S. Pat. Nos. 2,393,057 and 2,61 1,676. lt is found, however, that if the material of the plate has a thickness of less than 200 a, said means in the known embodiments are no longer sufficient to prevent warping.
It has been found, however, that the deformation of such a plate can be avoided entirely if, according to the invention, the plate consists of nickel and the cylindrical part consists of a copper-nickel alloy. This alloy may contain from 40 to 75 percent by weight of nickel, but preferably an alloy is used of 55 percent by weight of copper and 45 percent by weight of nickel. The plate may be soldered to the cylinder, for example, by means of silver or be secured thereto by means of welding or diffusion. It has surprisingly been found that a nickel plate in a thickness of less than 200 p. remains entirely flat in the said combination of the materials.
In order that the invention may be readily carried into effect, it will now be described in greater detail, by way of example, with reference to the accompanying drawing, in which FIG. 1 is a cross-sectional view of a known embodiment of an electron gun after the heating,
FIG. 2 is a cross-sectional view of a Wehnelt cylinder of another known construction, while FIG. 3 is a cross-sectional view of a particular embodiment of an electron gun according to the invention.
It has been found that the originally flat plate 4, after heating during the decomposition and formation of the cathode l, 2, is deformed as is shown in FIG. 1, so that the distance cathode-Wehnelt changes in spite of the presence of a circumferential 'groove 6.
The same is the case with the Wehnelt electrode 7 shown in F IG. 2 which consists entirely of chromium-nickel steel.
In FIG. 3 the perforated plate 9 consists of nickel, the supporting cylinder 8 of a copper-nickel alloy with 55 percent by weight of copper and 45 percent by weight of nickel. The plate 9 is soldered to the cylinder 8 by means of silver. The plate 9 also comprises a circumferential groove 6. The groove 6 is from the scope of the present invention.
What IS claimed is:
1. An electron gun comprising a cathode opposite to which is placed a metal plate having at least one aperture for passing an electron current, which plate comprises a circumferential strengthening groove and is secured to a metal cylinder, characterized in that the perforated plate consists of nickel having a thickness less than 200 p. and the cylinder consists of a suitable copper-nickel alloy.
2. An electron gun as claimed in claim 1, characterized in that the copper-nickel alloy of the cylinder is from 40 to 75 percent by weight of nickel.
3. An electron gun as claimed in claim 1 characterized in that the cylinder consists of an alloy of 55 percent by weight of copper and 45 percent by weight of nickel.
Claims (2)
- 2. An electron gun as claimed in claim 1, characterized in that the copper-nickel alloy of the cylinder is from 40 to 75 percent by weight of nickel.
- 3. An electron gun as claimed in claim 1 characterized in that the cylinder consists of an alloy of 55 percent by weight of copper and 45 percent by weight of nickel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6908004A NL6908004A (en) | 1969-05-24 | 1969-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3609438A true US3609438A (en) | 1971-09-28 |
Family
ID=19807012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US34650A Expired - Lifetime US3609438A (en) | 1969-05-24 | 1970-05-05 | Electron gun with nickel grid plate and copper-nickel alloy grid cylinder |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3609438A (en) |
| JP (1) | JPS4842372B1 (en) |
| BE (1) | BE750843A (en) |
| DE (1) | DE2020999A1 (en) |
| FR (1) | FR2048616A5 (en) |
| GB (1) | GB1246589A (en) |
| NL (1) | NL6908004A (en) |
| SE (1) | SE356163B (en) |
-
1969
- 1969-05-24 NL NL6908004A patent/NL6908004A/xx unknown
-
1970
- 1970-04-29 DE DE19702020999 patent/DE2020999A1/en active Pending
- 1970-05-05 US US34650A patent/US3609438A/en not_active Expired - Lifetime
- 1970-05-21 JP JP4298370A patent/JPS4842372B1/ja active Pending
- 1970-05-21 GB GB24650/70A patent/GB1246589A/en not_active Expired
- 1970-05-21 SE SE07005/70A patent/SE356163B/xx unknown
- 1970-05-21 FR FR7018479A patent/FR2048616A5/fr not_active Expired
- 1970-05-22 BE BE750843D patent/BE750843A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE356163B (en) | 1973-05-14 |
| BE750843A (en) | 1970-11-23 |
| NL6908004A (en) | 1970-11-26 |
| JPS4842372B1 (en) | 1973-12-12 |
| DE2020999A1 (en) | 1970-11-26 |
| GB1246589A (en) | 1971-09-15 |
| FR2048616A5 (en) | 1971-03-19 |
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