US2745979A - Electron gun, particularly for cathode ray tubes - Google Patents

Electron gun, particularly for cathode ray tubes Download PDF

Info

Publication number
US2745979A
US2745979A US312536A US31253652A US2745979A US 2745979 A US2745979 A US 2745979A US 312536 A US312536 A US 312536A US 31253652 A US31253652 A US 31253652A US 2745979 A US2745979 A US 2745979A
Authority
US
United States
Prior art keywords
anode
plate
electrode
studs
cathode
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
Application number
US312536A
Other languages
English (en)
Inventor
Aupoix Marcel
Droche Elie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2745979A publication Critical patent/US2745979A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/485—Construction of the gun or of parts thereof

Definitions

  • Cathode-ray tubes for television comprise an electrode system having a cathode, of which the surface heated by a filament wire is of small size, a control-electrode formed by a metal plate, having a small aperture, and a cup-shaped electrode, the bottom of which also has a small aperture, and which is termed the acceleration anode to distinguish from an additional, mostly cylindrical final anode, which is aligned wth the first anode.
  • the mounting and adjustment of the electrodes to one another is an accurate operation; special care must be taken that the control-electrode and the acceleration anode are accurately parallel to one another and spaced apart by the prescribed distance, whilst the apertures in the electrodes should be centred with respect to the cathode.
  • the fastening of the electrodes to glass rods or to stay rods by means of mica plates does not sufliciently safeguard the maintenance of the accurate adjustment obtained by means of jigs.
  • the invention has for its object to provide a structural improvement, so that the number of required parts is reduced, the manufacture may he carried out more rapidly and the centring is facilitated. It is particularly of importance for television tubes having a small beam spot, as used for 819 lines, the beam astigmatism being reduced.
  • the fastening means may be constituted by studs connected to the anode, extending through recesses in the plates of insulating material and provided with clamps, which bear on the free surface of the second insulating plate.
  • FIG. 1 shows the parts required for the system in a perspective view and separately and, moreover, the centring studs of a jig
  • Fig. 2 shows the assembled system in a perspective view
  • Fig. 3 shows a view of the complete mounting jig comprising the parts of the electrode system between the centring studs.
  • the acceleration anode is designated by A1. It is constituted by a cup-shaped electrode, the bottom of which has a small aperture 1. Round about the cylindrical part provision is made of two metal strips 2 and secured to the wall by soldering; the ends of these strips are bent away from the electrode and form two opposite clamping strips 3. Four studs 4 of non-magnetic material are secured to the metal strips 2,745,979 Patented May 15, 1956 ice at regular intervals along the periphery.
  • the controlciectrode G is constituted by a fiat metal disc, having the aperture 5 and three small radial extensions 6. A fourth extension 6a, which is slightly longer, serves to secure a supply wire to the electrode.
  • the plate 7 of ceramic material is provided between the acceleration anode A1 and the control-electrode G.
  • This plate has an aperture 812 and four recesses 8 along the periphery.
  • a second plate 9, also of ceramic material, has the aperture 100 and the recesses 10 along the periphery. It is provided on the other side of the control-electrode G as the disc 7. The surface facing this electrode has two grooves 11 at an angle of The two discs 7 and 9 and the intermediate plate G are slipped on the studs 4 of the acceleration anode-A1, the studs protruding through the recesses and being so long that a shoe eyelet 12 or a rivet can be fixed at their ends. These are tightly pressed against the plate 9 and then secured to the studs 4, for example, by soldering. The system is then secured, by means of the clamping strips 3, to the stay rods 15.
  • the cathode which is not visible in Fig. 2, since it extends in the aperture 10a of the plate 9, is secured to the stay rods 15 in a similar manner. To these rods are also secured the fastening means for the filament wire F, having supports 16.
  • the centring and the assembling of the separate parts of the electrode system, to which the invention refers, is carried out by means of the mounting jig shown in Fig. 3. It comprises tWo conical studs 17 and 18.
  • the stud 17 is tightly fixed in the body of the jig by means of the screw 19 and the stud 18 is seated freely rotatable on a spindle 20, which may be displaced in an axial direction by turning a screw 21.
  • the stud 22 has a thin pin 24, extending in the centring spindle, its diameter corresponding to the size of the apertures 1 and 5 in the acceleration anode A1 and the control-electrode G.
  • the stud 23 has a small centring sleeve 25, the outer diameter of which corresponds to the size of the aperture 19a in the disc 9, whereas the pin 24 at the stud 22 fits exactly in the aperture of the sleeve 25.
  • the acceleration anode A1 the plate 7 and the control-electrode G are arranged in succession on the pin 24 and the plate 9 is arranged on the sleeve 25.
  • the centring studs 23 and 24 are then arranged in the jig in line with one another between the conical studs 17 and 13, after which the stud 18 is shifted forwards by means of the nut 21 until the centring studs 22 and 23 are clamped. Care must be taken that the pin 24 extends in the sleeve 25.
  • the acceleration anode A1 and the control-electrode G are centred relative to one another, and since they engage the accurately Worked plate 7, they are at the prescribed distance from one another.
  • the clamps 12 are secured to the ends of the studs 4, so that the various parts are united.
  • the extensions 6 of the control-electrode are bent about the edge of the disc edge 7, so that this electrode is prevented from shifting.
  • the system can then be removed from the mounting jig and mounted on the stay rods 15.
  • the cathode is secured thereto; since the cathode is introduced into the aperture 18:: of the disc 9, it is centred.
  • the correct distance from the control-electrode G may be adjusted, since the front surface of the cathode is visible through the grooves 11.
  • the connection to the filament wire F is established by the supply wires 16, which are secured by clamps to the stay rods 15.
  • cathode-ray tubes to which the invention relates belong not only television tubes, but also tubes for measuring purposes, cathode-ray oscillographs and tubes for reproducing radar signalsv What we claim is:
  • An electron gun structure for a cathode-ray tube comprising a control grid and an acceleration anode, said control grid comprising a flat plate having a central aperture, a first flat plate of ceramic insulating material having a central aperture and recesses therein and disposed between said grid and anode and defining the spacing therebetween, a second flat plate of insulating material having a central aperture and recesses therein and disposed on the side of the grid remote from the anode, a plurality of studs connected to said anode and free of said control grid and passing freely through the recesses in said first and second plates, and means for clamping the ends of said studs against the free surface of said second plate to thereby urge the anode and second plate against one another and against the grid and first plate, whereby a unitary system is obtained.
  • An electron gun structure as claimed in claim 1 in which the studs are constituted of non-magnetic metal, and the clamping means comprises a rivet slipped on the free end of these studs and secured thereto by solder means.
  • control grid is disc-shaped and has radial extensions which are bent around and grip the edge of one of said plates to insure against movement therebetween.
  • An electron gun structure for a cathode-ray tube comprising a cathode, a disc-shaped control grid having a central aperture and an acceleration anode, a first flat plate of ceramic insulating material having a central aperture and recesses therein and disposed between said grid and anode and defining the spacing therebetween, a second flat plate of insulating material having a central aperture and recesses therein and disposed on the side of the grid remote from the anode, the surface of said second plate adjacent the grid having a pair of radial grooves at right angles to one another communicating with the central aperture therein, said cathode extending into the aperture of said second plate and being visible through said grooves, a plurality of studs connected to said anode and free of said control grid and passing freely through the recesses in said first and second plates, and means for clamping the ends of said studs against the free surface of said second plate to thereby urge the anode and second plate against one another and against the grid and first plate, whereby

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Particle Accelerators (AREA)
US312536A 1951-10-09 1952-10-01 Electron gun, particularly for cathode ray tubes Expired - Lifetime US2745979A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR972870X 1951-10-09

Publications (1)

Publication Number Publication Date
US2745979A true US2745979A (en) 1956-05-15

Family

ID=9516332

Family Applications (1)

Application Number Title Priority Date Filing Date
US312536A Expired - Lifetime US2745979A (en) 1951-10-09 1952-10-01 Electron gun, particularly for cathode ray tubes

Country Status (5)

Country Link
US (1) US2745979A (is")
BE (1) BE514668A (is")
DE (1) DE972870C (is")
FR (2) FR1043677A (is")
GB (1) GB716162A (is")

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871387A (en) * 1955-06-10 1959-01-27 English Electric Valve Co Ltd Electron gun structure for cathode ray tubes
US3004183A (en) * 1957-12-03 1961-10-10 Itt Electron gun
US3619688A (en) * 1969-03-28 1971-11-09 Griffiths Electronics Inc Electron gun with connector of alternate electrodes shielding intermediate electrode
US5235242A (en) * 1991-02-12 1993-08-10 Samsung Electron Device Co., Ltd. Cathode support structure of an electron gun for a cathode ray tube
WO2013068481A1 (de) * 2011-11-09 2013-05-16 Miyachi Europe GmbH Elektrisches isolierelement aus keramikwerkstoff für eine elektrische bearbeitungseinrichtung: entsprechende bearbeitungseinrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4424877B4 (de) * 1994-07-14 2005-03-24 Matsushita Electric Industrial Co., Ltd., Kadoma Vorrichtung zum twistfreien Zusammenbau von Elektronenstrahlsystemen

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2052882A (en) * 1929-10-26 1936-09-01 Arcturus Dev Company Vacuum tube elements assembly
US2072957A (en) * 1932-06-02 1937-03-09 Emi Ltd Electron tube
US2113005A (en) * 1936-07-31 1938-04-05 Rca Corp Mount for electron discharge devices
US2114136A (en) * 1932-01-06 1938-04-12 Rca Corp Cathode ray tube
US2150323A (en) * 1938-01-29 1939-03-14 Rca Corp Electrode mount
US2170663A (en) * 1935-03-30 1939-08-22 Rca Corp Electron discharge device
US2185807A (en) * 1937-04-30 1940-01-02 Gen Electric Cathode ray tube
US2202588A (en) * 1937-06-23 1940-05-28 Siemens Ag Electrode system for cathode ray tubes
US2443916A (en) * 1947-06-27 1948-06-22 Rca Corp Cathode-grid assembly for cathode-ray tubes
US2473547A (en) * 1945-09-28 1949-06-21 Raytheon Mfg Co Electron discharge device
US2540621A (en) * 1948-02-19 1951-02-06 Rca Corp Electron gun structure

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE681827C (de) * 1933-09-23 1939-10-02 Loewe Opta Gmbh Elektrodenanordnung fuer Braunsche Roehren
DE684895C (de) * 1934-08-03 1939-12-07 Telefunken Gmbh Einrichtung zur Elektrodenbefestigung in Kathodenstrahlroehren
DE689002C (de) * 1936-07-03 1940-03-08 Zeiss Ikon Akt Ges Elektrodenhalterung fuer Braunsche Roehren, insbesondere aus keramischem Material
DE714045C (de) * 1936-08-21 1941-11-20 Aeg Elektrodensystem fuer Braunsche Roehren mit vier oder mehr durchgehenden Staeben aus Isolierstoff, an denen die Elektroden des Strahlerzeugungssystems und gegebenenfalls auch die Ablenkplatten mittels Schellen gehaltert sind
GB480711A (en) * 1936-08-27 1938-02-28 Marconi Wireless Telegraph Co Improvements in or relating to cathode ray tubes

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2052882A (en) * 1929-10-26 1936-09-01 Arcturus Dev Company Vacuum tube elements assembly
US2114136A (en) * 1932-01-06 1938-04-12 Rca Corp Cathode ray tube
US2072957A (en) * 1932-06-02 1937-03-09 Emi Ltd Electron tube
US2170663A (en) * 1935-03-30 1939-08-22 Rca Corp Electron discharge device
US2113005A (en) * 1936-07-31 1938-04-05 Rca Corp Mount for electron discharge devices
US2185807A (en) * 1937-04-30 1940-01-02 Gen Electric Cathode ray tube
US2202588A (en) * 1937-06-23 1940-05-28 Siemens Ag Electrode system for cathode ray tubes
US2150323A (en) * 1938-01-29 1939-03-14 Rca Corp Electrode mount
US2473547A (en) * 1945-09-28 1949-06-21 Raytheon Mfg Co Electron discharge device
US2443916A (en) * 1947-06-27 1948-06-22 Rca Corp Cathode-grid assembly for cathode-ray tubes
US2540621A (en) * 1948-02-19 1951-02-06 Rca Corp Electron gun structure

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871387A (en) * 1955-06-10 1959-01-27 English Electric Valve Co Ltd Electron gun structure for cathode ray tubes
US3004183A (en) * 1957-12-03 1961-10-10 Itt Electron gun
US3619688A (en) * 1969-03-28 1971-11-09 Griffiths Electronics Inc Electron gun with connector of alternate electrodes shielding intermediate electrode
US5235242A (en) * 1991-02-12 1993-08-10 Samsung Electron Device Co., Ltd. Cathode support structure of an electron gun for a cathode ray tube
WO2013068481A1 (de) * 2011-11-09 2013-05-16 Miyachi Europe GmbH Elektrisches isolierelement aus keramikwerkstoff für eine elektrische bearbeitungseinrichtung: entsprechende bearbeitungseinrichtung
CN103930232A (zh) * 2011-11-09 2014-07-16 米亚基欧洲有限责任公司 用于电加工装置的、陶瓷材料做的电绝缘元件，相应的加工装置
US20140319104A1 (en) * 2011-11-09 2014-10-30 Miyachi Europe GmbH Electrical insulating element made of ceramic material for an electrical processing device, corresponding processing device
CN103930232B (zh) * 2011-11-09 2018-01-19 米亚基欧洲有限责任公司 用于电加工装置的、陶瓷材料做的电绝缘元件，相应的加工装置
CN108098211A (zh) * 2011-11-09 2018-06-01 米亚基欧洲有限责任公司 电加工装置
CN108098211B (zh) * 2011-11-09 2020-05-26 米亚基欧洲有限责任公司 电加工装置

Also Published As

Publication number Publication date
FR1043676A (fr) 1953-11-10
DE972870C (de) 1959-10-15
FR1043677A (fr) 1953-11-10
GB716162A (en) 1954-09-29
BE514668A (is")

Similar Documents

Publication Publication Date Title
US2268194A (en) Electron discharge device
US2472766A (en) Cathode-ray tube
US2310811A (en) Cathode-ray tube
US2432037A (en) Electron gun positioning means
US2745979A (en) Electron gun, particularly for cathode ray tubes
US2195914A (en) Cathode ray tube
US2170663A (en) Electron discharge device
US2219111A (en) Cathode ray tube
US2093876A (en) Braun tube
US2308800A (en) Electron discharge device
US3289268A (en) Assembly jig
US2386790A (en) Electron gun and the like
US2429824A (en) Gun structure for cathode-ray tubes
GB1421865A (en) Cathode ray tube including a non-rotationally symmetrical electron-optical element
US3462629A (en) Self-aligning electron gun construction
US2582454A (en) Cathode grid assembly
US3265920A (en) Electron-discharge device cathode assembly with radiation shield
US2464076A (en) Electron-ray tube
US2840739A (en) Cathode ray tube gun assembly
GB1177319A (en) Cathode-Ray Tube Arrangement
US2570165A (en) Limited-area cathode
US2414581A (en) Cathode assembly for magnetrons
US2421192A (en) Multicathode phototube
US2458962A (en) Cathode-ray tube
US3142775A (en) Electron gun assemblies for cathode-ray tubes