US2310811A - Cathode-ray tube - Google Patents

Cathode-ray tube Download PDF

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Publication number
US2310811A
US2310811A US386267A US38626741A US2310811A US 2310811 A US2310811 A US 2310811A US 386267 A US386267 A US 386267A US 38626741 A US38626741 A US 38626741A US 2310811 A US2310811 A US 2310811A
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cathode
ray tube
control electrode
plate
electrode
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Expired - Lifetime
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US386267A
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Schantl Erich
Messner Maximilian
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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/36—Tubes with flat electrodes, e.g. disc electrode

Definitions

  • This invention relates to cathode ray tubes, also designated as Braun tubes, and it aims to provide devices of this kind which are easy to manufacture and to which a high accuracy of construction is peculiar, especially as regards the distance between the emitting cathode and the control electrode.
  • the cathode has a circumferential edge which is pressed against a spacing member located between the cathode and control electrode.
  • Fig. 1 is a fragmentary sectional view of one embodiment of the invention
  • Fig. 2 is a sectional view of a modified form of cathode.
  • R denotes the bulb of a cathode ray tube.
  • the emissive layer E of the cathode is carried by a plate P whose peripheral edge P is bent to form a generally frusto-conical portion extending preferably rearwardly with respect to layer E and a control electrode S arranged in front of this layer.
  • the electrode S rests against an insulating body I1.
  • the middle of the electrode S is shown to be in the shape of a funnel projecting toward the cathode P, E. This shape, however, is immaterial to the inventive idea.
  • the electrode S has an aperture A in the middle. Through this aperture the electrons emerging from layer E are to pass.
  • the plate P is pressed against the body I1 with the aid of an insulating body I2 provided with a recess B in which the plate P is located.
  • Body I2 also contains a heating coil H which in the example here shown is a flat spiral arranged in a casing of insulating material.
  • the leads h, h. for supplying heating energy to the coil H are located on the side remote from P, E. Owing to the described circumferential bend of the plate P this plate bears firmly against the body I1, such bend and the recess B being so calculated that the plate P is compressed to some extent when assembling the device.
  • the pressure of P against I1 increases when the cathode becomes hot; but the distance between P, E and S is not varied thereby since P, E is prevented by I1 from moving toward S. Only the peripheral bend of P may yield laterally, the diameter of recess B being somewhat larger than that of the plate P. In this way the distance between emissive layer and control electrode will be independent of the operating temperature of the cathode ray tube.
  • the described construction also allows of making the distances between the several component parts small, this being desirable in many cases in order to shorten the length of such tubes.
  • the plane shape of the cathode P, E is merely shown by way of example.
  • the form thereof is susceptible of variation, provided that there is a circumferential generally frusto-conical edge arranged to be compressed by the bodies I1, I2.
  • the cathode may be formed as shown in Fig. 2, with a funnel-shaped projection. that extends toward the electrode S and is coated at its apex with the emissive layer.
  • the control electrode may be plane in its turn.
  • modifications of such conical cathode may be employed.
  • the conical cathode has the advantage that 'a field concentration occurs at its apex and that consequently the main emission takes place at the apex with the result that the emissive layer need not be arranged very carefully.
  • Means of any suitable kind may be employed for holding the parts I1, I2, S together.
  • spring clips C may serve this purpose.
  • I1 and I2 are of the same diameter, this being the case here illustrated, a tube D of metal, glass or insulating material may be inserted over them to center these parts and at the same time to aid in holding them together.
  • a cathode ray tube including a cathode and a control electrode, an insulating body between said cathode and control electrode for establishing the spacing therebetween, another insulating body on the side of said cathode remote from said control electrode, at least one of said bodies having a cavity therein for retaining said cathode therein, said cathode having a yieldable preformed peripheral edge for urging said bodies to separate from each other when pressed together, centering means inserted over said bodies and said control electrode for aiding in holding them together, and spring clip means for holding said bodies from separating and for holding said control electrode in" position relatively to said body and said cathode.
  • a cathode ray tube according to claim 1 in which a heating element is provided in a casing of insulating material in said cathode retaining cavity.

Description

Feb. '9, 1943. E, SCHANTL ET AL I 2,310,811
CATHODE-RAY TUBE Filed April 1, 1941 Patented Feb. 9, 1943 CATHODE-RAY TUBE Erich Schantl and Maximilian Messner, Berlin,
Germany; vested in the Alien Property Custodian Application April 1, 1941, Serial No. 386,267 In Germany March 29, 1940 3 Claims.
This invention relates to cathode ray tubes, also designated as Braun tubes, and it aims to provide devices of this kind which are easy to manufacture and to which a high accuracy of construction is peculiar, especially as regards the distance between the emitting cathode and the control electrode.
According to the invention, the cathode has a circumferential edge which is pressed against a spacing member located between the cathode and control electrode.
The invention will be understood from the following description and the accompanying drawing in which Fig. 1 is a fragmentary sectional view of one embodiment of the invention, and Fig. 2 is a sectional view of a modified form of cathode.
R denotes the bulb of a cathode ray tube. The emissive layer E of the cathode is carried by a plate P whose peripheral edge P is bent to form a generally frusto-conical portion extending preferably rearwardly with respect to layer E and a control electrode S arranged in front of this layer. The electrode S rests against an insulating body I1. The middle of the electrode S is shown to be in the shape of a funnel projecting toward the cathode P, E. This shape, however, is immaterial to the inventive idea. The electrode S has an aperture A in the middle. Through this aperture the electrons emerging from layer E are to pass. The plate P is pressed against the body I1 with the aid of an insulating body I2 provided with a recess B in which the plate P is located. Body I2 also contains a heating coil H which in the example here shown is a flat spiral arranged in a casing of insulating material. The leads h, h. for supplying heating energy to the coil H are located on the side remote from P, E. Owing to the described circumferential bend of the plate P this plate bears firmly against the body I1, such bend and the recess B being so calculated that the plate P is compressed to some extent when assembling the device. The pressure of P against I1 increases when the cathode becomes hot; but the distance between P, E and S is not varied thereby since P, E is prevented by I1 from moving toward S. Only the peripheral bend of P may yield laterally, the diameter of recess B being somewhat larger than that of the plate P. In this way the distance between emissive layer and control electrode will be independent of the operating temperature of the cathode ray tube. The described construction also allows of making the distances between the several component parts small, this being desirable in many cases in order to shorten the length of such tubes.
The plane shape of the cathode P, E is merely shown by way of example. The form thereof is susceptible of variation, provided that there is a circumferential generally frusto-conical edge arranged to be compressed by the bodies I1, I2. For instance, the cathode may be formed as shown in Fig. 2, with a funnel-shaped projection. that extends toward the electrode S and is coated at its apex with the emissive layer. In such case the control electrode may be plane in its turn. Also, modifications of such conical cathode may be employed. The conical cathode has the advantage that 'a field concentration occurs at its apex and that consequently the main emission takes place at the apex with the result that the emissive layer need not be arranged very carefully.
Means of any suitable kind may be employed for holding the parts I1, I2, S together. For instance, spring clips C may serve this purpose. Where I1 and I2 are of the same diameter, this being the case here illustrated, a tube D of metal, glass or insulating material may be inserted over them to center these parts and at the same time to aid in holding them together.
What is claimed is:
1. A cathode ray tube including a cathode and a control electrode, an insulating body between said cathode and control electrode for establishing the spacing therebetween, another insulating body on the side of said cathode remote from said control electrode, at least one of said bodies having a cavity therein for retaining said cathode therein, said cathode having a yieldable preformed peripheral edge for urging said bodies to separate from each other when pressed together, centering means inserted over said bodies and said control electrode for aiding in holding them together, and spring clip means for holding said bodies from separating and for holding said control electrode in" position relatively to said body and said cathode.
2. A cathode ray tube according to claim 1, in which said cathode consists of a plate having a peripheral edge bent rearwardly from the emission surface of said cathode for providing said yieldable preformed edge.
3. A cathode ray tube according to claim 1 in which a heating element is provided in a casing of insulating material in said cathode retaining cavity.
ERICH SCHANTL. MAXIMILIAN MESSNER.
US386267A 1940-03-29 1941-04-01 Cathode-ray tube Expired - Lifetime US2310811A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE217618X 1940-03-29

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US2310811A true US2310811A (en) 1943-02-09

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BE (1) BE440730A (en)
CH (1) CH217618A (en)
FR (1) FR871119A (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465370A (en) * 1944-06-26 1949-03-29 Standard Telephones Cables Ltd Ultra high frequency electron discharge device
US2476060A (en) * 1945-01-11 1949-07-12 Cossor Ltd A C Electron gun structure
US2484721A (en) * 1942-03-14 1949-10-11 Cossor Ltd A C Electrode gun such as is used in cathode-ray tubes
US2500355A (en) * 1944-11-14 1950-03-14 Sylvania Electric Prod Electron discharge tube
US2527127A (en) * 1948-12-24 1950-10-24 Bell Telephone Labor Inc Electronic discharge device
US2570165A (en) * 1949-08-16 1951-10-02 Rca Corp Limited-area cathode
US2644906A (en) * 1951-08-11 1953-07-07 Gen Electric Electron beam discharge device
US2695442A (en) * 1947-08-26 1954-11-30 Hartford Nat Bank & Trust Co Method of manufacturing electric discharge tubes
US2732512A (en) * 1956-01-24 briggs
US2825832A (en) * 1953-12-03 1958-03-04 Bell Telephone Labor Inc Thermionic cathode structure
US2840736A (en) * 1955-10-17 1958-06-24 Westinghouse Electric Corp Electron discharge device
US2886729A (en) * 1953-10-08 1959-05-12 Du Mont Allen B Lab Inc Grid-cathode structure for cathode ray tubes
US2892115A (en) * 1955-12-20 1959-06-23 Itt Cathode structures
US2938133A (en) * 1958-12-16 1960-05-24 Stewart Engineering Company Electron gun assembly
US3558965A (en) * 1967-10-02 1971-01-26 Nat Video Corp Cathode for television tube and method of making
US3641387A (en) * 1970-04-02 1972-02-08 Machlett Lab Inc Prestressed cathode structure for electron discharge devices
US3976908A (en) * 1974-03-02 1976-08-24 Leybold-Heraeus Gmbh & Co. Kg Electron beam generator with linear cathode
US4035685A (en) * 1974-04-11 1977-07-12 U.S. Philips Corporation Solid cathode cap for an X-ray tube
DE3010807A1 (en) * 1979-04-09 1980-10-16 Tektronix Inc ELECTRONIC RADIATOR GENERATION DEVICE WITH LOW-CAPACITY LOW CATHODE GRID ARRANGEMENT
DE3025886A1 (en) * 1979-07-12 1981-05-21 Naamloze Vennootschap Philips' Gloeilampenfabrieken, Eindhoven DEVICE WITH A TELEVISION CAMERA EAR AND TELEVISION CAMERA EYE FOR SUCH A DEVICE
US4323813A (en) * 1980-01-23 1982-04-06 Rca Corporation Spring-loaded resistive lens structure for electron gun
US4500809A (en) * 1979-04-09 1985-02-19 Tektronix, Inc. Electron gun having a low capacitance cathode and grid assembly

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732512A (en) * 1956-01-24 briggs
US2484721A (en) * 1942-03-14 1949-10-11 Cossor Ltd A C Electrode gun such as is used in cathode-ray tubes
US2465370A (en) * 1944-06-26 1949-03-29 Standard Telephones Cables Ltd Ultra high frequency electron discharge device
US2500355A (en) * 1944-11-14 1950-03-14 Sylvania Electric Prod Electron discharge tube
US2476060A (en) * 1945-01-11 1949-07-12 Cossor Ltd A C Electron gun structure
US2695442A (en) * 1947-08-26 1954-11-30 Hartford Nat Bank & Trust Co Method of manufacturing electric discharge tubes
US2527127A (en) * 1948-12-24 1950-10-24 Bell Telephone Labor Inc Electronic discharge device
US2570165A (en) * 1949-08-16 1951-10-02 Rca Corp Limited-area cathode
US2644906A (en) * 1951-08-11 1953-07-07 Gen Electric Electron beam discharge device
US2886729A (en) * 1953-10-08 1959-05-12 Du Mont Allen B Lab Inc Grid-cathode structure for cathode ray tubes
US2825832A (en) * 1953-12-03 1958-03-04 Bell Telephone Labor Inc Thermionic cathode structure
US2840736A (en) * 1955-10-17 1958-06-24 Westinghouse Electric Corp Electron discharge device
US2892115A (en) * 1955-12-20 1959-06-23 Itt Cathode structures
US2938133A (en) * 1958-12-16 1960-05-24 Stewart Engineering Company Electron gun assembly
US3558965A (en) * 1967-10-02 1971-01-26 Nat Video Corp Cathode for television tube and method of making
US3641387A (en) * 1970-04-02 1972-02-08 Machlett Lab Inc Prestressed cathode structure for electron discharge devices
US3976908A (en) * 1974-03-02 1976-08-24 Leybold-Heraeus Gmbh & Co. Kg Electron beam generator with linear cathode
US4035685A (en) * 1974-04-11 1977-07-12 U.S. Philips Corporation Solid cathode cap for an X-ray tube
DE3010807A1 (en) * 1979-04-09 1980-10-16 Tektronix Inc ELECTRONIC RADIATOR GENERATION DEVICE WITH LOW-CAPACITY LOW CATHODE GRID ARRANGEMENT
US4500809A (en) * 1979-04-09 1985-02-19 Tektronix, Inc. Electron gun having a low capacitance cathode and grid assembly
DE3025886A1 (en) * 1979-07-12 1981-05-21 Naamloze Vennootschap Philips' Gloeilampenfabrieken, Eindhoven DEVICE WITH A TELEVISION CAMERA EAR AND TELEVISION CAMERA EYE FOR SUCH A DEVICE
US4376907A (en) * 1979-07-12 1983-03-15 U.S. Philips Corporation Television camera tube with diode electron gun
US4323813A (en) * 1980-01-23 1982-04-06 Rca Corporation Spring-loaded resistive lens structure for electron gun

Also Published As

Publication number Publication date
BE440730A (en)
CH217618A (en) 1941-10-31
FR871119A (en) 1942-04-09

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