US2591521A - Cathode-ray tube and method of manufacturing such tubes - Google Patents
Cathode-ray tube and method of manufacturing such tubes Download PDFInfo
- Publication number
- US2591521A US2591521A US148033A US14803350A US2591521A US 2591521 A US2591521 A US 2591521A US 148033 A US148033 A US 148033A US 14803350 A US14803350 A US 14803350A US 2591521 A US2591521 A US 2591521A
- Authority
- US
- United States
- Prior art keywords
- tube
- cathode
- section
- tubes
- cylindrical
- 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
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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
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/861—Vessels or containers characterised by the form or the structure thereof
Definitions
- Cathode-ray tubes for television reception are generally mounted in a cabinet. With tubes arranged in a horizontal position, their length is a measure of the depth of the apparatus and also of the other dimensions which vary with the depth to a greater or less degree for aesthetic reasons. Consequently, in order to minimize the size of the apparatus it is of importance to reduce the length of the cathode-ray tube as much as possible.
- the present invention relates to cathode ray tubes comprising a cylindrical part and a substantially conical part.
- the length of the cylindrical neck of the tube is determined by the space occupied by the electrode-system for producing the electron beam and by the length of the coil producing the magnetic focussing field.
- the deflection coils gnay also influence the length of the neck. There is no reason for making this part of the tube longer than is required by the said factors.
- the length of the conical part of the tube is related to the desired deflection sensitivity, which varies in direct proportion with the spacing between the deflection system and the collecting screen for the electron-beam.
- the beam deflection increases and theenergy for producing the deflecting fields increases.
- This limitation may be obviated by extending the range in'which the deflecting fields operate and which is traversed by the beam.
- cathode-ray tubes for television reception are sometimes provided with a conical part, the sectional area of which is rectangular, so that it has the shape of a truncated pyramid.
- the sectional area of the tube where the neck adjoins the cone is then a reduced projection of the area of the image on the fluorescent screen.
- a glass bulb of rectangular section can be moulded.
- the cylindrical neck and the conical part are made separately and then the neck is sealed to the narrow end of the conical part. Since I am concerned with a junction between two parts, one of which has a circular and the other a rectangular section, this operation is more complicated than a joint between two parts having similar sections. However, it is advisable not to establish the joint at the transition between the cylindrical part and the conical part. Therefore, with tubes of which the conical part has a section having rotational symmetry a short cylindrical portion is sometimes pressed on to the cone so that the seal may be spaced apart from the transition between neck and cone.
- the invention combines the advantages of a rectangular section, having regard to reducing the length of the tube, and those obtained by the last-mentioned step.
- the cathode-ray tube to which the invention. relates comprises a glass vessel which encloses the exhausted space in which are housed the electrodes producing and directioning the electronbeam and the fluorescent screen, the said vessel consisting of a cylindrical neck and an adjoining substantially conical part.
- the tube has a rectangular internal section and a circular external section at the transition of the conical and the cylindrical part.
- the internal section of the mould which may be used for making the wall of the tube has rotational symmetry so that manufacture of the mould is easy.
- the conical part may develop into a cylindrical aperture.
- the manufacture of a corresponding die member which is rectangular at the transition between the conical and the cylindrical part, does not involve difiiculties.
- the area where the neck develops into the cone is mechanically, the weakest part of the tube.
- the wall thickness in situ should be such that the tube has sufficient rigidity to permit its further working, for example sealing of the neck and securing and sealing of the electrodes.
- the thickness of the wall must therefore not be smaller than that of the remaining part of the cone which is required to Withstand the pressure of the air, although a smaller wall thickness at the said area would permit a greater size of the space in which the beam travels.
- a smaller wall thickness at the said area would permit a greater size of the space in which the beam travels.
- At the corners of the internal rectangle in the tube there is no objection to make the wall thinner, since the required mechanical strength is retained owing to the greater wall thickness along the straight sides of the section. This results in a further reduction of the length of the tube with the same surface area required for the beam.
- Fig. 4 is a sectional view taken on the line C--D in Fig. 1.
- the right-hand part likewise relates to the known shape and the left-hand part to that obtained according to the present invention.
- the tube wall has a cylindrical part I conical part 2. At the top the cone has a rectangularinter'nal section,whence the curved lines -3 at the transition between the conical part 2 and the cylindrical neck portion. The point of maximum permissible deflection of the cathoderay "beam travels along these lines in scanning the area of image.
- the wall thickness is the same throughout, in contradistinction to the construction shown in the lefthand half. From Fig. 1 it appears that 'in the sectional plane AB the wall thickness along the straight sides is considerably greater, whereas at the corners of the rectangular internal sec tion the wa ll may be thinner. This likewise appears-from Figss2, S and 4. This is'not harmful to the strength of the tube since, owing to the greater wall thickness on the straight sides, the
- the mold is a die H whose contour corresponds to the internal configuration oi the tube and which fits into the mold with sufiicient clearance to permit the tube material to be poured therebetween, thus forming the tube.
- the die has a rectangular cross-section at the juncture of the flared out conical portion and the cylindrical portion of the tube element, while in the cylindrical portion as well as in the conical portion, the internal cross-section as determined by the die is circular.
- a vitreous envelope therefor comprising a conical portion flaring outwardly for supporting a screen at one end thereof and an adjoining cylindrical portion for housing an electron gun, said envelope having an internal section which is circular in the cylindrical portion and rectangular in the conical portion and having an internal section which changes from a circular section to a rectangular section in a continuous transition at the juncture of the conical and cylindrical portions of the envelope, the external section at said juncture maintaining a circularsection in a continuous transition to a larger diameter from the cylindrical porticirto the conical portion of the envelope, the wall thickness at the corners of the rectangular cross section being relatively thinner than the wall thickness of the cylindrical portion of the ,tube having internal and external rotational symmetry.
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL284965X | 1949-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2591521A true US2591521A (en) | 1952-04-01 |
Family
ID=19782469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US148033A Expired - Lifetime US2591521A (en) | 1949-03-30 | 1950-03-07 | Cathode-ray tube and method of manufacturing such tubes |
Country Status (5)
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3005122A (en) * | 1959-09-23 | 1961-10-17 | Owens Illinois Glass Co | Cathode ray tube envelope |
US3132017A (en) * | 1959-09-23 | 1964-05-05 | Owens Illinois Glass Co | Method of forming cathode ray tube body portion |
US3132018A (en) * | 1960-09-26 | 1964-05-05 | Owens Illinois Glass Co | Centrifugal casting apparatus for making a glass article |
US3150951A (en) * | 1960-11-18 | 1964-09-29 | Owens Illinois Glass Co | Method for forming hollow glass articles |
US3151968A (en) * | 1961-05-22 | 1964-10-06 | Owens Illinois Glass Co | Apparatus and method for forming hollow glass articles |
US3161314A (en) * | 1961-12-19 | 1964-12-15 | Corning Glass Works | Cathode ray tube envelope |
US3806750A (en) * | 1969-02-28 | 1974-04-23 | Tokyo Shibaura Electric Co | Wide angle type cathode-ray tube |
WO1998007174A1 (en) * | 1996-08-13 | 1998-02-19 | Thomson Consumer Electronics, Inc. | Color picture tube having improved funnel |
US20060132019A1 (en) * | 2004-12-21 | 2006-06-22 | Samsung Corning Co., Ltd. | Funnel for use in a cathode ray tube |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2117019A (en) * | 1936-06-20 | 1938-05-10 | Westinghouse Electric & Mfg Co | Double-winding generator and rectifier combination |
US2178826A (en) * | 1937-03-31 | 1939-11-07 | Hygrade Sylvania Corp | Closure member for electric discharge tubes and the like |
GB525181A (en) * | 1939-02-17 | 1940-08-22 | Kolster Brandes Ltd | Improvements in or relating to cathode ray tubes |
US2232098A (en) * | 1938-02-11 | 1941-02-18 | Hygrade Sylvania Corp | Cathode ray tube |
FR867824A (fr) * | 1938-09-07 | 1941-11-29 | Telefunken Gmbh | Tube de braun, notamment pour télévision |
GB589135A (en) * | 1944-06-01 | 1947-06-12 | Mullard Radio Valve Co Ltd | Improvements in cathode ray tubes |
-
0
- BE BE494775D patent/BE494775A/xx unknown
-
1950
- 1950-03-07 US US148033A patent/US2591521A/en not_active Expired - Lifetime
- 1950-03-28 DE DEN662A patent/DE812682C/de not_active Expired
- 1950-03-28 CH CH284965D patent/CH284965A/de unknown
- 1950-03-28 FR FR1015233D patent/FR1015233A/fr not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2117019A (en) * | 1936-06-20 | 1938-05-10 | Westinghouse Electric & Mfg Co | Double-winding generator and rectifier combination |
US2178826A (en) * | 1937-03-31 | 1939-11-07 | Hygrade Sylvania Corp | Closure member for electric discharge tubes and the like |
US2232098A (en) * | 1938-02-11 | 1941-02-18 | Hygrade Sylvania Corp | Cathode ray tube |
FR867824A (fr) * | 1938-09-07 | 1941-11-29 | Telefunken Gmbh | Tube de braun, notamment pour télévision |
GB525181A (en) * | 1939-02-17 | 1940-08-22 | Kolster Brandes Ltd | Improvements in or relating to cathode ray tubes |
GB589135A (en) * | 1944-06-01 | 1947-06-12 | Mullard Radio Valve Co Ltd | Improvements in cathode ray tubes |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3005122A (en) * | 1959-09-23 | 1961-10-17 | Owens Illinois Glass Co | Cathode ray tube envelope |
US3132017A (en) * | 1959-09-23 | 1964-05-05 | Owens Illinois Glass Co | Method of forming cathode ray tube body portion |
US3132018A (en) * | 1960-09-26 | 1964-05-05 | Owens Illinois Glass Co | Centrifugal casting apparatus for making a glass article |
US3150951A (en) * | 1960-11-18 | 1964-09-29 | Owens Illinois Glass Co | Method for forming hollow glass articles |
US3151968A (en) * | 1961-05-22 | 1964-10-06 | Owens Illinois Glass Co | Apparatus and method for forming hollow glass articles |
US3161314A (en) * | 1961-12-19 | 1964-12-15 | Corning Glass Works | Cathode ray tube envelope |
US3806750A (en) * | 1969-02-28 | 1974-04-23 | Tokyo Shibaura Electric Co | Wide angle type cathode-ray tube |
WO1998007174A1 (en) * | 1996-08-13 | 1998-02-19 | Thomson Consumer Electronics, Inc. | Color picture tube having improved funnel |
US20060132019A1 (en) * | 2004-12-21 | 2006-06-22 | Samsung Corning Co., Ltd. | Funnel for use in a cathode ray tube |
Also Published As
Publication number | Publication date |
---|---|
DE812682C (de) | 1951-09-03 |
FR1015233A (fr) | 1952-08-29 |
BE494775A (US06291589-20010918-C00001.png) | |
CH284965A (de) | 1952-08-15 |
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