US3806750A - Wide angle type cathode-ray tube - Google Patents
Wide angle type cathode-ray tube Download PDFInfo
- Publication number
- US3806750A US3806750A US00228191A US22819172A US3806750A US 3806750 A US3806750 A US 3806750A US 00228191 A US00228191 A US 00228191A US 22819172 A US22819172 A US 22819172A US 3806750 A US3806750 A US 3806750A
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- Prior art keywords
- cone section
- ray tube
- rectangular
- rear cone
- cathode
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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
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/861—Vessels or containers characterised by the form or the structure thereof
-
- 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
- H01J29/70—Arrangements for deflecting ray or beam
- H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
- H01J29/76—Deflecting by magnetic fields only
- H01J29/762—Deflecting by magnetic fields only using saddle coils or printed windings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
- H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
- H01J31/203—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam
- H01J31/205—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam with three electron beams in delta configuration
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/86—Vessels and containers
- H01J2229/8603—Neck or cone portions of the CRT vessel
- H01J2229/8606—Neck or cone portions of the CRT vessel characterised by the shape
- H01J2229/8609—Non circular cross-sections
Definitions
- ABSTRACT ln a cathode-ray tube
- the envelope comprises conical and neck portions wherein the conical portion has a rear cone section of rectangular truncated pyramidal shape and a front cone section flaring from the rear cone section at a wider angle.
- This invention relates to a cathode-ray tube and more particularly to a wide angle type color cathode-ray tube envelope.
- a cathode-ray tube of wide angle type used to date has a narrow neck to reduce required deflection power.
- such a narrow neck naturally demands that an electron gun to be received therein be made fully narrow, thus giving rise to a blooming effect.
- cathode-ray tube envelope of the wide angle type which has a rear cone section of rectangular truncated pyramidal shape.
- the conical portion of a funnel-shaped tube envelope which includes tubular neck and conical portions comprises a rear cone section of rectangular truncated pyramidal shape and a front cone flaring therefrom at a wide angle.
- the cathode-ray tube envelope of this invention constructed as described above almost fully prevents the occurrence of neck shadows, enables electron beams to be deflected at a wide angle and moreover permits the easy fitting of the deflection coil at an accurate location.
- FIG. 1 is a perspective view of a cathode-ray tube according to one embodiment of this invention.
- FIG. 2 is a perspective view of a deflection coil
- FIG. 3 is a cross sectional view of a cathode-ray tube fitted with a deflection coil and convergence ring;
- FIG. 4 is a cross sectional view of a cathode-ray tube according to another embodiment of the invention with grooves formed along the inside of the ridges defined by the adjacent walls of a rear cone of rectangular pyramidal shape;
- FIG. 5 is a cross sectional view on line 5-5 of FIG. 4;
- FIG. 6 is a cross sectional view on line 6-6 of FIG. 4.
- a funnel-shaped glass envelope 11 a tubular neck bulb 12 integral with a conical portion 13 widely flaring from the front end of the neck bulb 12.
- the front side of the envelope is sealed with a faceplate 14 having a rectangular shape, the height of which bears a ratio of three-fourths to the width and coated on the inner surface with a fluorescent screen 15.
- This fluorescent screen 15 is an ordinary type used with a color cathode-ray tube which is prepared by depositing fluorescent material on the inside of the faceplate 14 in the form of dots constituting triads or triplets, each representing three colors of red, green and blue, or in the form of extremely short strips collectively presenting a different pattern of arrangement in which they are juxtaposed in the specified order of red, greenand blue.
- the aforesaid dots or strips of fluorescent material glow red, green and blue.
- a shadow mask 16 is so disposed as to face the faceplate 14 at a predetermined distance therefrom.
- a triple electron gun assembly 17 consisting of three electron gun members arranged in a triangular form or in a straight line.
- the conical portion 13 comprises a rear cone section 13a of rectangular truncated pyramidal shape which has a rectangular front end and a rear end integral with the neck bulb l2 and a front cone section 13b flaring from the rectangular front end the rear cone section 13a at a wider angle which has a rectangular large front end.
- the rear cone 13a should preferably have a rectangular cross section similar to the rectangular form of the faceplate 14 so as to resolve the problem of neck shadows.
- the electron gun assembly is received in the neck bulb 12 with its top end disposed adjacent to the front side of the neck bulb 12.
- an electromagnetic deflection coil 21 so as to surround the rear cone section 13a of the envelope l1.
- Said deflection coil 21 has its interior formed into a rectangular truncated pyramidal shape similar to that of the rear cone 13a so as to ensure a close fit therewith and, as is well known, includes coil members for horizontal and vertical deflection.
- Aroundpart of the neck bulb 12 is provided a convergence adjusting means 22.
- the shadow mask type color cathode-ray tube having the cathode ray tube envelope of the aforesaid construction is not fundamentally different in operation from the ordinary type.
- Three beams of electrons emitted from the respective members of the triple electron gun assembly 17 have their passage deflected toward the'faceplate 14 by the deflection coil 21 to be focused on the predetermined holes of the shadow mask, thereby exciting the corresponding points on the fluorescent screen 15 to reproduce color pictures on the faceplate 14.
- the rear cone 13a is formed, as previously described, into a rectangular truncated pyramidal shape, enabling electron beams from the electron gun assembly 17 to be deflected as widely as, for example, an angle of l and more than 1 10 without being intercepted by the front part of the neck bulb 12, regardless of the direction of said deflection, so that the appearance of neck shadows at the screen corners is eliminated to permit reproduction of true shades of color even at said screen corners.
- the cathode-ray tube having the cathode ray tube envelope of this invention enables electron beams to be deflected at a much wider angle than has been possible with the prior art type, thus prominently reducing the depth and weight of a color television receiving set.
- the rectangular truncated pyramidal shape of the interior of the deflection coil 21 similar to that of the rear cone 13a permits an easy fitting therebetween.
- insertion of a'triple electron gun assembly 17 into the neck bulb 12 in a conformity with the arrangement of the red, green and blue glowing dots or strips of the fluorescent screen can be effected more easily and accurately by taking one side of the rectangular cross section of the rear cone section 13a as a reference side, thereby enabling a cathode-ray tube to display an excellent electrical performance.
- the envelope 11 includes, as in the preceding embodiment, a conical portion 13 comprising a front cone section 13b and a rear cone section 13a of rectangular truncated pyramidal shape, and a neck bulb 12.
- a conical portion 13 comprising a front cone section 13b and a rear cone section 13a of rectangular truncated pyramidal shape, and a neck bulb 12.
- the difference between said modification and the foregoing embodiment is that there are formed four grooves 30 along the inside of the ridges defined by the adjacent walls of the rear cone section 130.
- grooves 30 extend up to the corresponding corners of the rear side of the front cone section 13b with a progressively increasing width and each take a curved form at said comers, with the radius of curvature set at, for example, 2 mm at the front side of the rear cone section.
- the grooves 30 should be formed unduly deep, those parts of the walls of the rear cone section 13a which are adjacent to said grooves 30 would be cracked. To avoid such event, therefore, the grooves 30 should preferably be formed to suchdepth that the aforesaid walls of the rear cone 13a retain at least half the original thickness. Formation of such grooves has the same effect as increasing the transversal dimension of the inner space of the rear cone 13a, thus contributing to minimize the occurrence of neck shadows.
- LA cathode ray tube including an envelope comprising:
- a conical portion including:
- a cathode-ray tube according to claim 1 further comprising a deflection coil disposed around said rear cone section and having its interior formed into a rectangular truncated pyramidal shape similar to that of the rear cone section so as to ensure a close fit therewith.
- a cathode ray tube according to claim 1 further comprising a faceplate fixed to the rectangular wide end of said front cone section; a shadow mask interior of said envelope and facing said faceplate; and a triple electron gun assembly received in said neck portion.
- a cathode ray tube envelope comprising: a tubular neck portion; and a conical portion including:
- a cathode ray tube according to claim 5 wherein at least the front end of each of said grooves is curved.
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- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
In a cathode-ray tube, the envelope comprises conical and neck portions wherein the conical portion has a rear cone section of rectangular truncated pyramidal shape and a front cone section flaring from the rear cone section at a wider angle.
Description
United States Patent [191 Tsuneta et al.
[ WIDE ANGLE TYPE CATHODE-RAY TUBE [75] Inventors: Asahide Tsuneta, Kawasaki; Shinichi Sawagata, Tokyo, both of Japan [73] Assignee: Tokyo Shibaura Electric Co., Ltd.,
Kawasaki-shi, Japan 22 Filed: Feb. 22, 1972 211 Appl. No.: 228,191
Related U.S. Application Data [63] Continuation-impart of Ser. No. 14,173, Feb. 25,
1970, abandoned.
[30] Foreign Application Priority Data Feb. 28, 1969 Japan 44-17635 Feb. 28, 1969 Japan 44-17636 Feb. 28, 1969 Japan 44-17637 [52] U.S. Cl. 313/64 [51] Int. Cl. H01j 29/00 [58] Field of Search 313/64 [56] References Cited UNITED STATES PATENTS 2,928,968 I 3/1960 Hoagland 313/64 [451 Apr. 23, :1974
Tirico 313/76 2,591,521 4/1952 De Gier.... 313/64 2,767,342 10/1956 Anthony 313/64 3,005,122 10/1961 Coleman et a1 313/64 3,564,329 2/1971 Uetz 315/8 FOREIGN PATENTS OR APPLICATIONS 525,181 8/1940 Great Britain 313/64 820,181 9/1959 Great Britain 313/64 867,824 9/1941 France 313/64 1,545,517 11/1968 France 313/64 Primary Examinerl-lerman Karl Saalbach Attorney, Agent, or FirmF1ynn & Frishauf [5 7] ABSTRACT ln a cathode-ray tube, the envelope comprises conical and neck portions wherein the conical portion has a rear cone section of rectangular truncated pyramidal shape and a front cone section flaring from the rear cone section at a wider angle.
6 Claims, 6 Drawing Figures PATENTEU APR 2 3 I974 FIG.2
FIG.4
CROSS-REFERENCE TO RELATED APPLICATION This is a continuation-in-part of the US. Patent Application Ser. No. 14,173, filed on Feb. 25, 1970, now abandoned.
BACKGROUND OF THE INVENTION This invention relates to a cathode-ray tube and more particularly to a wide angle type color cathode-ray tube envelope.
Due to the recent desire to have a television receiving set made more compact and lighter, there has grown demand for a cathode-ray tube enabling electron beams from an electron gun assembly to be deflected at a wider angle than has been possible in the past so as to provide a compact and light color television receiving set. To obtain a cathode-ray tube permitting the wide deflection of electron beams, there are raised problems in connection with the occurrence of the socalled neck shadows at the screen comers and requirement of larger amounts of power to deflect electron beams at a wider angle. The neck shadows originate with the fact that electron beams deflected toward the screen corners are interrupted in their passage by the circular front edge of the cylindrical neck. To avoid the appearance of said neck shadows, electron beams have to be deflected at a limited angle, which in turn has obstructed the development of a cathode-ray tube permitting the wider deflection of electron beams. Further, with the conventional cathode-ray tube using a triple electron gun assembly, beams of electrons emitted from a particular member of said electron gun assembly are liable to be interrupted in their passage at certain corners of the neck portion, obscuring or degrading the color image presented at the corresponding screen corners. Moreover, the neck and conical portions of the prior art cathode-ray tube which are formed with a round cross section present difficulties in properly locating a deflection coil.
As mentioned above, deflction of electron beams at a wider angle requires larger amounts of deflection power, exerting a harmful effect on the other circuits of a television receiving set and further increasing the power consumption of the receiving set as a whole. A cathode-ray tube of wide angle type used to date has a narrow neck to reduce required deflection power. However, such a narrow neck naturally demands that an electron gun to be received therein be made fully narrow, thus giving rise to a blooming effect.
SUMMARY OF THE INVENTION It is accordingly the object of this invention to provide a cathode-ray tube envelope of the wide angle type which has a rear cone section of rectangular truncated pyramidal shape.
SUMMARY OF THE INVENTION In a cathode-ray tube of this invention, the conical portion of a funnel-shaped tube envelope which includes tubular neck and conical portions comprises a rear cone section of rectangular truncated pyramidal shape and a front cone flaring therefrom at a wide angle.
The cathode-ray tube envelope of this invention constructed as described above almost fully prevents the occurrence of neck shadows, enables electron beams to be deflected at a wide angle and moreover permits the easy fitting of the deflection coil at an accurate location.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of a cathode-ray tube according to one embodiment of this invention;
FIG. 2 is a perspective view of a deflection coil;
FIG. 3 is a cross sectional view of a cathode-ray tube fitted with a deflection coil and convergence ring;
FIG. 4 is a cross sectional view of a cathode-ray tube according to another embodiment of the invention with grooves formed along the inside of the ridges defined by the adjacent walls of a rear cone of rectangular pyramidal shape;
FIG. 5 is a cross sectional view on line 5-5 of FIG. 4; and
FIG. 6 is a cross sectional view on line 6-6 of FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS. 1 to 3, a funnel-shaped glass envelope 11 a tubular neck bulb 12 integral with a conical portion 13 widely flaring from the front end of the neck bulb 12. The front side of the envelope is sealed with a faceplate 14 having a rectangular shape, the height of which bears a ratio of three-fourths to the width and coated on the inner surface with a fluorescent screen 15. This fluorescent screen 15 is an ordinary type used with a color cathode-ray tube which is prepared by depositing fluorescent material on the inside of the faceplate 14 in the form of dots constituting triads or triplets, each representing three colors of red, green and blue, or in the form of extremely short strips collectively presenting a different pattern of arrangement in which they are juxtaposed in the specified order of red, greenand blue. When excited by scanning electron beams, the aforesaid dots or strips of fluorescent material glow red, green and blue. A shadow mask 16 is so disposed as to face the faceplate 14 at a predetermined distance therefrom. In the neck bulb 12 is received a triple electron gun assembly 17 consisting of three electron gun members arranged in a triangular form or in a straight line.
According to the embodiment of FIGS. 1 to 3, the conical portion 13 comprises a rear cone section 13a of rectangular truncated pyramidal shape which has a rectangular front end and a rear end integral with the neck bulb l2 and a front cone section 13b flaring from the rectangular front end the rear cone section 13a at a wider angle which has a rectangular large front end. The rear cone 13a should preferably have a rectangular cross section similar to the rectangular form of the faceplate 14 so as to resolve the problem of neck shadows.
To the rear end of the neck bulb 12 is attached a stem socket 20'lengthwise penetrated by lead pins electrically connected to the respective electron gun members 18 of the electron gun assembly 17. The electron gun assembly is received in the neck bulb 12 with its top end disposed adjacent to the front side of the neck bulb 12. There is provided an electromagnetic deflection coil 21 so as to surround the rear cone section 13a of the envelope l1. Said deflection coil 21 has its interior formed into a rectangular truncated pyramidal shape similar to that of the rear cone 13a so as to ensure a close fit therewith and, as is well known, includes coil members for horizontal and vertical deflection. Aroundpart of the neck bulb 12 is provided a convergence adjusting means 22.
The shadow mask type color cathode-ray tube having the cathode ray tube envelope of the aforesaid construction is not fundamentally different in operation from the ordinary type. Three beams of electrons emitted from the respective members of the triple electron gun assembly 17 have their passage deflected toward the'faceplate 14 by the deflection coil 21 to be focused on the predetermined holes of the shadow mask, thereby exciting the corresponding points on the fluorescent screen 15 to reproduce color pictures on the faceplate 14.
According to the cahotde-ray tube envelope of this invention, the rear cone 13a is formed, as previously described, into a rectangular truncated pyramidal shape, enabling electron beams from the electron gun assembly 17 to be deflected as widely as, for example, an angle of l and more than 1 10 without being intercepted by the front part of the neck bulb 12, regardless of the direction of said deflection, so that the appearance of neck shadows at the screen corners is eliminated to permit reproduction of true shades of color even at said screen corners.
As mentioned above, the cathode-ray tube having the cathode ray tube envelope of this invention enables electron beams to be deflected at a much wider angle than has been possible with the prior art type, thus prominently reducing the depth and weight of a color television receiving set. Moreover, the rectangular truncated pyramidal shape of the interior of the deflection coil 21 similar to that of the rear cone 13a permits an easy fitting therebetween. Further, insertion of a'triple electron gun assembly 17 into the neck bulb 12 in a conformity with the arrangement of the red, green and blue glowing dots or strips of the fluorescent screen can be effected more easily and accurately by taking one side of the rectangular cross section of the rear cone section 13a as a reference side, thereby enabling a cathode-ray tube to display an excellent electrical performance.
There will now be described by reference to FIGS. 4 to 6 a modification of the cathode-ray tube of this invention. According to said modification, the envelope 11 includes, as in the preceding embodiment, a conical portion 13 comprising a front cone section 13b and a rear cone section 13a of rectangular truncated pyramidal shape, and a neck bulb 12. The difference between said modification and the foregoing embodiment is that there are formed four grooves 30 along the inside of the ridges defined by the adjacent walls of the rear cone section 130. These grooves 30 extend up to the corresponding corners of the rear side of the front cone section 13b with a progressively increasing width and each take a curved form at said comers, with the radius of curvature set at, for example, 2 mm at the front side of the rear cone section.
If the grooves 30 should be formed unduly deep, those parts of the walls of the rear cone section 13a which are adjacent to said grooves 30 would be cracked. To avoid such event, therefore, the grooves 30 should preferably be formed to suchdepth that the aforesaid walls of the rear cone 13a retain at least half the original thickness. Formation of such grooves has the same effect as increasing the transversal dimension of the inner space of the rear cone 13a, thus contributing to minimize the occurrence of neck shadows.
What we claim is:
LA cathode ray tube including an envelope comprising:
a tubular neck portion; and
a conical portion including:
a rear cone section of rectangular truncated pyramidal shape over substantially the whole length thereof, said rear cone section having a rectangular front end and a rear end integral with said tubular neck portion, and four grooves extending along the inside of the ridges defined by the adjacent walls of said rear cone section, said grooves extending along substantially the length of said ridges and having a progressively increasing width toward the scren end of the tube; and
a front cone section flaring from the rectangular front end of said rear cone section.
2. A cathode-ray tube according to claim 1 further comprising a deflection coil disposed around said rear cone section and having its interior formed into a rectangular truncated pyramidal shape similar to that of the rear cone section so as to ensure a close fit therewith.
3. A cathode ray tube according to claim 1 further comprising a faceplate fixed to the rectangular wide end of said front cone section; a shadow mask interior of said envelope and facing said faceplate; and a triple electron gun assembly received in said neck portion.
4. A cathode ray tube according to claim 1 wherein at least the front end of each of said grooves is curved.
5. A cathode ray tube envelope comprising: a tubular neck portion; and a conical portion including:
a rear cone section of rectangular truncated pyramidal shape over substantially the whole length thereof, said rear cone section having a rectangular front end and a rear end integral with said tubular neck portion, and four grooves extending along the inside of the ridges defined by the adjacent walls of said rear cone section, said grooves extending along substantially the length of said ridges and having a progressively increasing width toward the screen end of the tube; and
a front cone section flaring from the rectangular front end of said rear cone section. 6. A cathode ray tube according to claim 5 wherein at least the front end of each of said grooves is curved.
Claims (6)
1. A cathode ray tue including an envelope comprising: a tubular neck portion; and a conical portion including: a rear cone section of rectangular truncated pyramidal shape over substantially the whole length thereof, said rear cone section having a rectangular front end and a rear end integral with said tubular neck portion, and four grooves extending along the inside of the ridges defined by the adjacent walls of said rear cone section, said grooves extending along substantially the length of said ridges and having a progressively increasing width toward the scren end of the tube; and a front cone section flaring from the rectangular front end of said rear cone section.
2. A cathode-ray tube according to claim 1 further comprising a deflection coil disposed around said rear cone section and having its interior formed into a rectangular truncated pyramidal shape similar to that of the rear cone section so as to ensure a close fit therewith.
3. A cathode ray tube according to claim 1 further comprising a faceplate fixed to the rectangular wide end of said front cone section; a shadow mask interior of said envelope and facing said faceplate; and a triple electron gun assembly received in said neck portion.
4. A cathode ray tube according to claim 1 wherein at least the front end of each of said grooves is curved.
5. A cathode ray tube envelope comprising: a tubular neck portion; and a conical portion including: a rear cone section of rectangular truncated pyramidal shape over substantially the whole length thereof, said rear cone section having a rectangular front end and a rear end integral with said tubular neck portion, and four grooves extending along the inside of the ridges defined by the adjacent walls of said rear cone section, said grooves extending along substantially the length of said ridges and having a progressively increasing width toward the screen end of the tube; and a front cone section flaring from the rectangular front end of said rear cone section.
6. A cathode ray tube according to claim 5 wherein at least the front end of each of said grooves is curved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00228191A US3806750A (en) | 1969-02-28 | 1972-02-22 | Wide angle type cathode-ray tube |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1763669 | 1969-02-28 | ||
| JP1763769 | 1969-02-28 | ||
| JP1763569 | 1969-02-28 | ||
| US1417370A | 1970-02-25 | 1970-02-25 | |
| US00228191A US3806750A (en) | 1969-02-28 | 1972-02-22 | Wide angle type cathode-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3806750A true US3806750A (en) | 1974-04-23 |
Family
ID=27519940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00228191A Expired - Lifetime US3806750A (en) | 1969-02-28 | 1972-02-22 | Wide angle type cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3806750A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4229720A (en) * | 1978-01-18 | 1980-10-21 | U.S. Philips Corporation | Deflection unit for a color television display tube |
| US4812708A (en) * | 1985-01-29 | 1989-03-14 | Rca Licensing Corp. | Thin cathode-ray tube |
| US5155411A (en) * | 1991-02-14 | 1992-10-13 | Thomson Consumer Electronics, Inc. | Color CRT assembly having an improved envelope |
| EP0831515A2 (en) * | 1996-09-18 | 1998-03-25 | Kabushiki Kaisha Toshiba | Cathode ray tube apparatus |
| EP0886297A2 (en) * | 1997-06-20 | 1998-12-23 | Kabushiki Kaisha Toshiba | Cathode ray tube |
| EP0917175A1 (en) * | 1997-11-14 | 1999-05-19 | Kabushiki Kaisha Toshiba | Cathode ray tube |
| CN1071937C (en) * | 1996-05-28 | 2001-09-26 | 东芝株式会社 | Cathod ray tube |
| US20020008458A1 (en) * | 2000-07-21 | 2002-01-24 | Nobuhiko Akoh | Deflection yoke and cathode ray tube apparatus provided with the same |
| US6359379B1 (en) * | 1999-01-08 | 2002-03-19 | Samsug Display Devices Co., Ltd. | Cathode ray tube having funnel with flute sections |
| US6452321B1 (en) * | 1998-06-03 | 2002-09-17 | Kabushiki Kaisha Toshiba | Deflection device for a cathode ray tube having a correction coil with a non-circular shape |
| US20030227246A1 (en) * | 2002-06-07 | 2003-12-11 | Lee Seok Moon | Color cathode-ray tube |
| US6713952B1 (en) * | 1998-11-24 | 2004-03-30 | Samsung Display Devices Co., Ltd. | Cathode ray tube |
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| GB525181A (en) * | 1939-02-17 | 1940-08-22 | Kolster Brandes Ltd | Improvements in or relating to cathode ray tubes |
| FR867824A (en) * | 1938-09-07 | 1941-11-29 | Telefunken Gmbh | Braun tube, especially for television |
| US2591521A (en) * | 1949-03-30 | 1952-04-01 | Hartford Nat Bank & Trust Co | Cathode-ray tube and method of manufacturing such tubes |
| US2767342A (en) * | 1952-12-04 | 1956-10-16 | Rca Corp | Composite glass and metal cathode-ray tube |
| GB820181A (en) * | 1956-11-02 | 1959-09-16 | Gen Electric Co Ltd | Improvements in or relating to cathode ray tubes |
| US2928968A (en) * | 1959-02-27 | 1960-03-15 | Paramount Pictures Corp | Cathode-ray tube switching grid support system |
| US2986667A (en) * | 1952-07-10 | 1961-05-30 | Arthur L Tirico | Electron beam deflection |
| US3005122A (en) * | 1959-09-23 | 1961-10-17 | Owens Illinois Glass Co | Cathode ray tube envelope |
| FR1545517A (en) * | 1966-12-02 | 1968-11-08 | Philips Nv | Cathode ray tube for the reproduction of color images |
| US3564329A (en) * | 1968-10-28 | 1971-02-16 | Philco Ford Corp | Shielding apparatus of metal plates strap-mounted on cathode ray tube for shielding against external magnetic fields |
-
1972
- 1972-02-22 US US00228191A patent/US3806750A/en not_active Expired - Lifetime
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR867824A (en) * | 1938-09-07 | 1941-11-29 | Telefunken Gmbh | Braun tube, especially for television |
| GB525181A (en) * | 1939-02-17 | 1940-08-22 | Kolster Brandes Ltd | Improvements in or relating to cathode ray tubes |
| US2591521A (en) * | 1949-03-30 | 1952-04-01 | Hartford Nat Bank & Trust Co | Cathode-ray tube and method of manufacturing such tubes |
| US2986667A (en) * | 1952-07-10 | 1961-05-30 | Arthur L Tirico | Electron beam deflection |
| US2767342A (en) * | 1952-12-04 | 1956-10-16 | Rca Corp | Composite glass and metal cathode-ray tube |
| GB820181A (en) * | 1956-11-02 | 1959-09-16 | Gen Electric Co Ltd | Improvements in or relating to cathode ray tubes |
| US2928968A (en) * | 1959-02-27 | 1960-03-15 | Paramount Pictures Corp | Cathode-ray tube switching grid support system |
| US3005122A (en) * | 1959-09-23 | 1961-10-17 | Owens Illinois Glass Co | Cathode ray tube envelope |
| FR1545517A (en) * | 1966-12-02 | 1968-11-08 | Philips Nv | Cathode ray tube for the reproduction of color images |
| US3564329A (en) * | 1968-10-28 | 1971-02-16 | Philco Ford Corp | Shielding apparatus of metal plates strap-mounted on cathode ray tube for shielding against external magnetic fields |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4229720A (en) * | 1978-01-18 | 1980-10-21 | U.S. Philips Corporation | Deflection unit for a color television display tube |
| US4812708A (en) * | 1985-01-29 | 1989-03-14 | Rca Licensing Corp. | Thin cathode-ray tube |
| US5155411A (en) * | 1991-02-14 | 1992-10-13 | Thomson Consumer Electronics, Inc. | Color CRT assembly having an improved envelope |
| CN1071937C (en) * | 1996-05-28 | 2001-09-26 | 东芝株式会社 | Cathod ray tube |
| EP0831515A2 (en) * | 1996-09-18 | 1998-03-25 | Kabushiki Kaisha Toshiba | Cathode ray tube apparatus |
| EP0831515A3 (en) * | 1996-09-18 | 1998-09-02 | Kabushiki Kaisha Toshiba | Cathode ray tube apparatus |
| US6087767A (en) * | 1997-06-20 | 2000-07-11 | Kabushiki Kaisha Toshiba | CRT with non-circular cone and yoke |
| EP0886297A3 (en) * | 1997-06-20 | 1999-06-02 | Kabushiki Kaisha Toshiba | Cathode ray tube |
| EP0886297A2 (en) * | 1997-06-20 | 1998-12-23 | Kabushiki Kaisha Toshiba | Cathode ray tube |
| EP0917175A1 (en) * | 1997-11-14 | 1999-05-19 | Kabushiki Kaisha Toshiba | Cathode ray tube |
| US6268692B1 (en) | 1997-11-14 | 2001-07-31 | Kabushiki Kaisha Toshiba | Cathode ray tube with contoured envelope |
| US6452321B1 (en) * | 1998-06-03 | 2002-09-17 | Kabushiki Kaisha Toshiba | Deflection device for a cathode ray tube having a correction coil with a non-circular shape |
| US6713952B1 (en) * | 1998-11-24 | 2004-03-30 | Samsung Display Devices Co., Ltd. | Cathode ray tube |
| US6359379B1 (en) * | 1999-01-08 | 2002-03-19 | Samsug Display Devices Co., Ltd. | Cathode ray tube having funnel with flute sections |
| US20020008458A1 (en) * | 2000-07-21 | 2002-01-24 | Nobuhiko Akoh | Deflection yoke and cathode ray tube apparatus provided with the same |
| US6798130B2 (en) | 2000-07-21 | 2004-09-28 | Kabushiki Kaisha Toshiba | Deflection yoke and cathode ray tube apparatus provided with the same |
| US20030227246A1 (en) * | 2002-06-07 | 2003-12-11 | Lee Seok Moon | Color cathode-ray tube |
| US6894430B2 (en) * | 2002-06-07 | 2005-05-17 | Lg. Philips Displays Korea Co., Ltd. | Color cathode-ray tube |
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