US3197669A - Electron emitting element for electron gun - Google Patents
Electron emitting element for electron gun Download PDFInfo
- Publication number
- US3197669A US3197669A US112084A US11208461A US3197669A US 3197669 A US3197669 A US 3197669A US 112084 A US112084 A US 112084A US 11208461 A US11208461 A US 11208461A US 3197669 A US3197669 A US 3197669A
- Authority
- US
- United States
- Prior art keywords
- flat area
- filament
- electron
- strip
- gun
- 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
- 230000005291 magnetic effect Effects 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000010894 electron beam technology Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000004020 conductor Substances 0.000 description 6
- 239000011810 insulating material Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052715 tantalum Inorganic materials 0.000 description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 241000792859 Enema Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000007920 enema Substances 0.000 description 1
- 229940079360 enema for constipation Drugs 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000033458 reproduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement or ion-optical arrangement
- H01J37/06—Electron sources; Electron guns
- H01J37/067—Replacing parts of guns; Mutual adjustment of electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement or ion-optical arrangement
- H01J37/06—Electron sources; Electron guns
- H01J37/065—Construction of guns or parts thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement or ion-optical arrangement
- H01J37/06—Electron sources; Electron guns
- H01J37/07—Eliminating deleterious effects due to thermal effects or electric or magnetic fields
Definitions
- the invention relates to an electron beam gun and has reference more particularly to a new and improved electron emitting filament ior an electron gun which will be mechanically and electrically stable.
- the stream of electrons is accelerated and focused by structure designed for the purpose whereby a high power density beam is produced for impinging on the work pieces, with the result that the energy of the beam is transferred to the work to cause fusion.
- the essential elements of such a welding device comprise a supporting body portion, a filament, a cathode, an anode and a focusing coil. The elements are so designated and have such correlation with each other that various metals and particularly those characterized by a high melting temperature can be satisfactorily welded within a vacuum.
- An object of the present invention is to provide a fila ment for such an electron gun which will be inexpensive to produce, which will be highly efiicient in operation, and which will have a shape such as to materially facilitate easy insertion and removal of the filament from the clamping means of the gun.
- Another objects of the invention are to provide a new and-improved filament for an electron gun that can be punched from a metal plate, thus making possible reproductions which will be accurate as to shape and dimensions; to provide filaments for an electron gun wherein the area for electron emission will be precisely the same for each filament; and to provide filaments for the purposes as stated which will be sturdy and mechanically and electrically stable.
- Another object of the invention is to provide a filament for an electron gun which will be made of tantalum or other suitable materials, which will be precisely shaped to provide a flat emitting surface, and wherein the shape of the filament will be such that the magnetic field caused by the flow of current, and thus the dispersion of the electron beam as caused by the magnetic field, will be substantially eliminated.
- FIGURE 1 is a longitudinal sectional view taken substantially along line 11 of FIGURE 2, and which shows the structural details of an electron gun incorporating the improved filament of the invention;
- FIGURE 2 is a top plan view of the electron beam gun of FIGURE 1;
- FIGURE 3 is a fragmentary sectional view similar to FIGURE 1 but which more clearly illustrates the mode of operation of the electron gun as disclosed;
- FIGURE 4 is another fragmentary sectional view illustrating the adjustable clamping means forthe spacing rings
- FIGURE 5 is still another fragmentary sectional view and which shows in detail the manner in which the present filament can be releasably clamped to the current conducting electrodes of the gun;
- FIGURE 6 is a plan view of the filament in clamped arrangement as shown in FIGURE 5;
- FIGURE 7 is adetail view showing the size and shape of the metal blank prior to the bending thereof for forming the filament.
- FIGURE 8 is a schematic view showing electrical connections for the various elements of the electron beam gun as disclosed.
- the embodiment selected for illustrating the invention employes a cap or body portion 26 from which the various parts of the gun are suspended.
- the said body portion is formed of insulating material having good dielectric strength, good heat conductivity, and which is also mechanically strong with low moisture and gas absorption.
- the body portion accordingly suspends a pair of electrodes 22 and 24 for conducting current to the filament 25.
- the body portion also suspends a spaced inside shell or cage 26 for supporting the cathode 27 and a spaced outside shell or cage 28 which functions as a holder for the anode 30.
- the current conducting electrodes 22 and 24, and the inner cage 26 comprise a unit which is supported from the insulating body portion 29 primarily by the plate members 31 spaced and insulated from each other and to which the cage 26 of stainless steel is welded as at 32.
- the plate members 31 are secured centrally to the body portion and this central section is cored to provide the elliptical opening 33, FlGURE 2.
- Said opening receives the sockets 34 and 35 preferably formed or" copper and which have a plug receiving recess 35 in their exposed top end whereas their reduced depending end is threaded at 37.
- This end of each socket extends through a washer of insulating material such as 33 and through its respective plate member 31 and the end is threaded into one of the electrodes.
- socket 34 is mechanically and electrically connected to electrode 22, whereas socket 35 connects with electrode 24.
- the sockets 34 and 35 are adapted to receive plugs, not shown, and which electrically connect the sockets and thus the electrodes to a source or" current for heating the electron emitting filament 25.
- Said sources of current may have a voltage of about 5 volts with an amperage which may average approximately 40 amperes.
- the electrodes 22 and 24 are thus disposed in a depending, side by side relation relatively adjacent each other and which requires the location-of spacers of insulating material such as 40, 41 and 42 for maintaining the electrodes in desired spaced relation.
- Thesecuring bolts 43 extend through the electrodes and through the washers 41 and 42, respectively, to receive the nuts 44 and which are properly insulated from electrode 22.
- the electrodes are thus mechanically connected to form a unit and which support on respective sides a clamping arrangement for clamping the filament to the electrodes.
- Each electrode has a clamping bar such as 45 and 45 disposed in contact with its outside surface and each bar provides a lower flange 47 and 48 adapted to contact a shoulder such as St) on its respective electrode.
- a clamping member 51 is provided for each bar and the same contacts its bar at longitudinally spaced locations for which purpose each member 51 is provided with feet 52.
- a bolt 53 extends through each of the members and through its associated clamping bar and has threaded connection with its respective electrode.
- the clamping members are preferably formed of metal such as copper and which has some resiliency since upon tightening the bolts 53 it will be understood that a spring loading action is applied to each clamping bar, thus forcing and securely maintaining the flanges 47 and 4-3 against a shoulder to thus provide a good mechanical and electrical clamp for the lilament 25.
- the inner cage 25 of substantially cylindrical shape may be constructed of stainless steel and the cage is formed with a plurality of openings 49 whereby convenient access is provided for manipulating the screws 52. Release of the screws and disassembly of the clamping arrangement will be necessary in the event a filament has to be replaced.
- the lower terminal end of the inside cage 26 is threaded as at 54 and this threaded end receives the retaining ring 55 for releasably retaining the cathode 27 in place on the bottom of the cage.
- the said cathode is maintained at a negative potential of approximately 50,000 volts and the same is provided with a center opening which receives the axially positioned filament It is important that the filament have an accurately aligned relation with the opening for the most etficient production of electrons and also the undersurface of the cathode 27 is shaped at 56 as best shown in FIGURE 3 for the same purpose.
- the filament 25 is formed from a strip of metal 58, FIGURE '7, such as tantalum or tungsten, the same having a shape as shown in FIGURE 7.
- the relatively wide extremities 59 comprise the portions of the same which are clamped between the shoulders 54 and the flanges 47 and 48, respectively.
- the connecting portions 60 narrow the strip down to a central section 61 and which has a length whereby to permit a bending of the section back on itself while still presenting a surface area adequate for the emission of electrons for the present gun. With the filament in clamped engagement with the electrodes 22 and 24 as shown in FIGURE 5 the connecting portions 60 extend diagonally downward and inward to thebends 52 whereupon the metal strip extends laterally outward to the outside bends 63.
- the formation of the filament 25 as described and as shown in FIGURES l, 3 and 5 has the desirable effect of reversing current flow with respect to the central emitting section 61 and thus the magnetic field caused by flow in one direction is nullified by current llow in an opposite direction and vice versa.
- the magnetic field which would otherwise exist is eliminated and thus dispersion of the electron beam as would be caused by such a magnetic field is also eliminated. in other words, the formation of the filament by its non-inductive nature minimizes the magnetic field produced by the filament.
- the electron beam should emerge vertically from the gun and in this respect the filament is important. Its flat area provides an electron emitting surface of definite size and which can be maintained fiat or as an alternative the entire filament can be replaced at relatively little expense and in a most easy and rapid manner. Since the filament is accurately reproducible a change in filament does not interfere in any manner with the operation of the apparatus.
- the shape of the filament is such as to locate the clamping portions in planes which are at right angles to the ilat area. Also, the metal of the strip at each end of the flat area has the reverse bends 62 and 63 which elfect a reversal in current flow all as described, and further the width of the filament in this area is a mini mum.
- the outside shell or cage 28 is likewise provided with a plurality of openings 65 and the said cage is suspended from the body portion 20 by the encircling clamp 66.
- the cage at its upper end is welded at 67 to the clamp and which is held to the body portion by the securing bolts 68 being located under the annular flange 69 which comprises an integral part of the body portion.
- the cage provides a support for the ring 73 of insulating material having the same desirable characteristics as the material of the body portion.
- the anode 30 is supported and accurately positioned by the ring 70 with its opening '71 in alignment with the opening in the cathode 27 and with the filament 25.
- the invention provides adjustable hangers 72 and spacing rings such as 73, FIGURE 3, for varying the cathode-anode distance.
- Two hangers 72 are provided diametrically spaced on the cage 23 and each hanger is slotted at 74 and formed with a groove 75 at its depending end.
- An annular flange 76 on the anode supporting ring 70 is retained by the groove 75 and a threaded stud 77 extends from the cage through the slot 74 and re eeives the releasable knob 73.
- the anode supporting ring 70 and thus the anode 34B are spaced the minimum distance from the cathode to give the maximum rating for the gun, for example 300 milliamperes at maximum operating voltage of about 25,000 volts. Since lower currents at the maximum voltage are often desirable, spacing rings are employed and which are interposed between the end of the cage 28 and the ring 70. For example, in FIGURE 3, the ring 73 lowers the anode 39 to an extent which gives a current of approximately 50 milliamperes. In FIG- URE 4 the ring '89 is greater in length and thus the cathode-anode distance is increased for a relatively low current of about 25 milliamperes.
- the body portion 20 is formed with :1 depending nose portion 81 and which presents an inwardly sloping surface 32 extcriorly of the body portion and a relatively long surface within the body portion until the inside cage 26 is reached.
- the nose 81 is interposed between the inside and outside cages 26 and 28, respectively, to present the maximum creep distance between these parts. This is desirable since the parts have a high potential difference during operation. The result of this structure is to insure safe operation of the gun at said high operating potentials and without any arcing.
- a focusing coil 83 is suspended by the screws 74 from the anode supporting ring 70.
- the said focusing coil essentially consists of a pair of coils such as 84 and 35 encased in an enclosing shell 36 of iron and which have an armature 87 also of iron located between the adjacent inner edges of the coils.
- An air gap 88 exists on each side of the armature between the same and the interior cylinder of iron 90 for the respective coils. The air gaps are thus located at the central plane of the focusing coil.
- a relatively low voltage, direct current is caused to flow through the coils 34 and to provide a magnetic effect within the central passage formed by the interior cylinders 90.
- the focusing coil is located below the anode where the electron beam starts to diverge.
- the action of the magnetic flux from coil to armature is such as to cause the beam to converge and by adjusting the current fiowing in the coils the beam of electrons can natural phenomenon by providing the, focusing coil 33.
- the coil is located a predetermined distance below the anode 39 and even though different spacing rings are used, this distance remains fixed.
- the electrical circuit for the gun is shown schematically in FIGURE 8.
- the alternating power supply indicated by the leads L and L includes the primary winding 96 of a transformer 97 which has a secondary winding 98 connected to the conductors 100 and 101, which in turn supply a heating current at the desired voltage to the electrodes 22 and 24, and thus to the filament 25.
- the high voltage power supply furnishes a direct current at the desired voltage for maintaining the required electrical field between the cathode and the anode.
- the negative conductor 192 is connected to the conductor 16%) and the conductor 103 completes the circuit to the cathode 27.
- the positive conductor 104 from the high voltage power supply has connection with the anode 30 and a parallel circuit including conductor 165 is connected to the workpiece and grounded.
- An electron emitting element comprising a strip of metal of substantially the same thickness throughout but which varies in width, said element having a shape providing a pair of spaced clamping portions, a centrally located uninterrupted fiat area and diagonal portions connecting the clamping portions with the flat area, said clamping portions being disposed in parallel planes and which have a right angle relation with the flat area, said flat area at respective ends being joined to the diagonal connecting portions by the metal of the strip and which has reverse bends, whereby the magnetic field such as may be caused by current flow in the fiat area is substantially nullified, and the said strip having its maximum width at the clamping portions and its minimum width along the length of the flat area.
- An electron emitting element comprising a strip of metal of substantially the same thickness throughout but which varies in width, said element having a shape providing a pair of spaced clamping portions, a centrally located uninterrupted fiat area and diagonal portions connecting the clamping portions with the flat area, said clamping portions being disposed in parallel planes and which have a right angle relation with the flat area, the said strip having its maximum width at the clamping portions and its minimum width along the length of the flat area, and the electron emitting element having a noninductive shape which minimizes the magnetic field produced by current flow in the metal strip.
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Electron Sources, Ion Sources (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US112084A US3197669A (en) | 1961-05-12 | 1961-05-23 | Electron emitting element for electron gun |
GB13936/62A GB1009986A (en) | 1961-05-12 | 1962-04-11 | Electron emitting element for electron gun |
GB13938/62A GB1009987A (en) | 1961-05-12 | 1962-04-11 | Electron gun |
FR896058A FR1330180A (fr) | 1961-05-12 | 1962-04-28 | émetteur d'électrons pour canon à électrons |
FR896059A FR1323202A (fr) | 1961-05-12 | 1962-04-28 | Canon à électrons |
CH565562A CH414876A (fr) | 1961-05-12 | 1962-05-10 | Canon à électrons |
DES79398A DE1232661B (de) | 1961-05-12 | 1962-05-10 | Elektronenstrahlerzeugungssystem mit Band-Kathode, einer die Kathode umgebenden Steuerelektrode und mit einer Anode, insbesondere fuer elektronisches Schweissen |
BE617491A BE617491A (fr) | 1961-05-23 | 1962-05-10 | Emetteur d'électrons pour canon à électrons |
CH568662A CH400381A (fr) | 1961-05-12 | 1962-05-11 | Emetteur d'electrons pour canon à électrons |
US380746A US3322930A (en) | 1961-05-12 | 1964-07-07 | Protective shield for electron gun |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US109575A US3187216A (en) | 1961-05-12 | 1961-05-12 | Electron gun having a releasably clamped electron emitting element |
US112084A US3197669A (en) | 1961-05-12 | 1961-05-23 | Electron emitting element for electron gun |
US380746A US3322930A (en) | 1961-05-12 | 1964-07-07 | Protective shield for electron gun |
Publications (1)
Publication Number | Publication Date |
---|---|
US3197669A true US3197669A (en) | 1965-07-27 |
Family
ID=27380688
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US112084A Expired - Lifetime US3197669A (en) | 1961-05-12 | 1961-05-23 | Electron emitting element for electron gun |
US380746A Expired - Lifetime US3322930A (en) | 1961-05-12 | 1964-07-07 | Protective shield for electron gun |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US380746A Expired - Lifetime US3322930A (en) | 1961-05-12 | 1964-07-07 | Protective shield for electron gun |
Country Status (4)
Country | Link |
---|---|
US (2) | US3197669A (fr) |
CH (2) | CH414876A (fr) |
DE (1) | DE1232661B (fr) |
GB (2) | GB1009986A (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4574178A (en) * | 1983-09-17 | 1986-03-04 | Leybold-Heraeus Gmbh | Electron gun |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3396262A (en) * | 1963-11-28 | 1968-08-06 | Nippon Electric Co | Means for observing electron beams |
US3400243A (en) * | 1964-08-10 | 1968-09-03 | Mech Tronics Corp | Electron beam welding machine |
US3433922A (en) * | 1964-08-10 | 1969-03-18 | Mech Tronics Corp | Electron beam welding machine |
US3433923A (en) * | 1964-08-10 | 1969-03-18 | Mech Tronics Corp | Electronic beam welding machine |
US3428776A (en) * | 1966-01-28 | 1969-02-18 | Gen Electric | Method and apparatus for extracting a charged particle beam into a higher pressure atmosphere |
US3474220A (en) * | 1967-05-17 | 1969-10-21 | Webb James E | Device for preventing high voltage arcing in electron beam welding |
DE3930203A1 (de) * | 1989-09-09 | 1991-03-14 | Ptr Praezisionstech Gmbh | Katodenhalter fuer einen elektronenstrahlerzeuger |
DE59010590D1 (de) * | 1989-09-09 | 1997-01-16 | Ptr Praezisionstech Gmbh | Katodenhalter für einen Elektronenstrahlerzeuger |
US5075532A (en) * | 1990-06-19 | 1991-12-24 | Jatco Corporation | Spatter-free electron beam welding apparatus with spatter catching device associated therewith |
DE4104845C5 (de) * | 1991-02-16 | 2004-09-09 | PTR Präzisionstechnik GmbH | Elektronenstrahlerzeuger, insbesondere für eine Elektronenstrahlkanone |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2111940A (en) * | 1932-04-22 | 1938-03-22 | Loewe Opta Gmbh | Braun tube for oscillographic and television purposes |
US2283896A (en) * | 1941-06-24 | 1942-05-19 | Westinghouse Electric & Mfg Co | Cathode structure |
US2727177A (en) * | 1952-02-11 | 1955-12-13 | Westinghouse Electric Corp | Electrostatic lens system |
US3034012A (en) * | 1958-10-15 | 1962-05-08 | Vickers Electrical Co Ltd | Electron gun assemblies |
US3069584A (en) * | 1959-07-29 | 1962-12-18 | Jack W Frazer | Method of making tungsten filaments |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2501882A (en) * | 1948-03-18 | 1950-03-28 | Research Corp | High-voltage high-vacuum acceleration tube |
US2771568A (en) * | 1951-01-31 | 1956-11-20 | Zeiss Carl | Utilizing electron energy for physically and chemically changing members |
GB697823A (en) * | 1951-07-30 | 1953-09-30 | Vickers Electrical Co Ltd | Improvements relating to electric discharge apparatus |
DE1100835B (de) * | 1952-03-01 | 1961-03-02 | Zeiss Carl Fa | Einrichtung zum Fraesen von Profilen, zum Schneiden von Schablonen oder zum Bohren von Duesenkanaelen mittels eines Ladungstraegerstrahles |
DE1033816B (de) * | 1952-07-25 | 1958-07-10 | Zeiss Carl Fa | Verfahren zum Bohren feiner Loecher |
US2899556A (en) * | 1952-10-17 | 1959-08-11 | Apparatus for the treatment of substances | |
DE1036419B (de) * | 1954-07-24 | 1958-08-14 | Siemens Ag | Elektronenquelle mit flaechenhafter Kathode fuer an der Pumpe arbeitende Elektronenstrahlgeraete |
US2932588A (en) * | 1955-07-06 | 1960-04-12 | English Electric Valve Co Ltd | Methods of manufacturing thin films of refractory dielectric materials |
US3046936A (en) * | 1958-06-04 | 1962-07-31 | Nat Res Corp | Improvement in vacuum coating apparatus comprising an ion trap for the electron gun thereof |
DE1119428B (de) * | 1958-08-30 | 1961-12-14 | Zeiss Carl Fa | Einrichtung zur Objektbeobachtung in Geraeten zur Materialbearbeitung mittels Ladungstraegerstrahl |
SU137604A1 (ru) * | 1960-10-12 | 1960-11-30 | О.К. Назаренко | Устройство дл электронно-лучевой сварки |
-
1961
- 1961-05-23 US US112084A patent/US3197669A/en not_active Expired - Lifetime
-
1962
- 1962-04-11 GB GB13936/62A patent/GB1009986A/en not_active Expired
- 1962-04-11 GB GB13938/62A patent/GB1009987A/en not_active Expired
- 1962-05-10 CH CH565562A patent/CH414876A/fr unknown
- 1962-05-10 DE DES79398A patent/DE1232661B/de active Pending
- 1962-05-11 CH CH568662A patent/CH400381A/fr unknown
-
1964
- 1964-07-07 US US380746A patent/US3322930A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2111940A (en) * | 1932-04-22 | 1938-03-22 | Loewe Opta Gmbh | Braun tube for oscillographic and television purposes |
US2283896A (en) * | 1941-06-24 | 1942-05-19 | Westinghouse Electric & Mfg Co | Cathode structure |
US2727177A (en) * | 1952-02-11 | 1955-12-13 | Westinghouse Electric Corp | Electrostatic lens system |
US3034012A (en) * | 1958-10-15 | 1962-05-08 | Vickers Electrical Co Ltd | Electron gun assemblies |
US3069584A (en) * | 1959-07-29 | 1962-12-18 | Jack W Frazer | Method of making tungsten filaments |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4574178A (en) * | 1983-09-17 | 1986-03-04 | Leybold-Heraeus Gmbh | Electron gun |
Also Published As
Publication number | Publication date |
---|---|
GB1009986A (en) | 1965-11-17 |
US3322930A (en) | 1967-05-30 |
CH400381A (fr) | 1965-10-15 |
GB1009987A (en) | 1965-11-17 |
CH414876A (fr) | 1966-06-15 |
DE1232661B (de) | 1967-01-19 |
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