US3720345A - Television bulb with improved strength - Google Patents

Television bulb with improved strength Download PDF

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Publication number
US3720345A
US3720345A US00044016A US3720345DA US3720345A US 3720345 A US3720345 A US 3720345A US 00044016 A US00044016 A US 00044016A US 3720345D A US3720345D A US 3720345DA US 3720345 A US3720345 A US 3720345A
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US
United States
Prior art keywords
funnel
faceplate
side walls
generally parallel
horizontal axis
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
US00044016A
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English (en)
Inventor
J Logue
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.)
Techneglas LLC
Original Assignee
Owens Illinois Inc
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 Owens Illinois Inc filed Critical Owens Illinois Inc
Application granted granted Critical
Publication of US3720345A publication Critical patent/US3720345A/en
Assigned to OWENS-ILLINOIS TELEVISION PRODUCTS INC. reassignment OWENS-ILLINOIS TELEVISION PRODUCTS INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OWENS-ILLINOIS, INC., A CORP. OF OHIO
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 A wide-angle color television picture bulb comprising a generally rectangular glass faceplate having horizontal and vertical axes, said horizontal axis being longer than the vertical axis, a substantially wide-angle hollow glass funnel having a generally tubular neck at one end, a generally tubular flaring yoke area extending from the said neck, and side walls joined to and diverging from said yoke area to a portion joined to said faceplate.
  • the funnel side walls which extend generally parallel to the horizontal axis of the faceplate have a central portion thereof which is substantially flat in all cross sections thereof and is smoothly interconnected with the remaining portions of said side walls.
  • the funnel side walls which extend generally parallel to the vertical axis of the faceplate have portions thereof which are substantially bowed outwardly relative to the vertical axis and side walls which extend generally parallel to the horizontal axis of the faceplate.
  • This invention relates to an improved television picture tube bulb having a wide angle of divergence for displaying a picture on a coated surface thereof known as a faceplate.
  • the funnel of the tube has two pair of diverging walls.
  • One pair of walls are generally triangu- 1 lar shaped geometrically similar planar sidewalls on the diametrically disposed sides which are generally parallel to the horizontal axis of the faceplate.
  • the invention is of utility when applied to cathode-ray television picture tubes and in funnel bodies or funnels which form a part of such television picture tubes.
  • Such tubes when made of glass, are commonly molded in separate parts including a funnel body or funnel having a yoke area, a faceplate and a neck tube extending from the neck end of the funnel body, said parts being sealed together dur ing the process of manufacturing the picture tube.
  • the funnel or body comprises walls which are flared, divergent from the smaller or neck end towards the larger, faceplate end to which the faceplate is united.
  • the faceplate has a long or horizontal axis and a short or vertical axis and the funnel has sides which are generally parallel to the horizontal and vertical axes of the faceplate.
  • the yoke area of the funnel is a transition area between the funnel walls and the neck and is the means for positioning for an electronic device known as a yoke which serves to direct the dispersion of an elec tron beam which strikes a phosphorescent material and reproduces a picture on the faceplate.
  • the side walls are flared at as wide an angle of divergence as is practical.
  • a divergence angle greater than 90 the tube is called a 'wide angle tube.
  • the tubes are always vacuumized and thereby subjected to an unbalanced atmospheric pressure which places a strain on the tube and tends to break the tube at the yoke area of the funnel.
  • Prior Art In television picture tubes with a deflection of greater than 90, the walls of the funnel have an increased angle of divergence to insure an obstructionfree path for an electron beam to scan the inner surface of the faceplate.
  • the conventional design of a funnel is such that the walls of the vertical axis are round or bowed and then approach the face-funnel seal edge in an angle tending toward the perpendicular angle.
  • Prior art practices have been to increase the bowing of the funnel in order to strengthen it.
  • FIG. 7 is a view showing profiles of sections containing the horizontal and vertical axes of an improved funnel embodying the invention.
  • FIG. 8 is an overall perspective view taken from the end of the bulb opposite to that of FIG. 2.
  • This invention relates to an improved television bulb having a funnel with a pair of substantially flat triangular shaped planar sidewalls along the sides of the funnel which are generally parallel to the horizontal axis of the faceplate.
  • This invention provides a funnel design which improves the strength to an acceptable, commercial level.
  • the conventional funnel is rounded or bowed along the sides which are generally parallel to the horizontal and vertical axes of the faceplate and the funnel walls approach the funnel seal-face edge at an angle tending to be perpendicular to the seal edge.
  • compression rather than the expected tension stresses was present in the sides parallel to the horizontal axis near the seal edge.
  • the stress pattern is modified within the funnel by depressing the walls which are generally parallel to the horizontal axis of the faceplate so that the surface of these walls from the yoke area to the funnel seal edge is relatively flat in profile without the usual bulging and forms generally triangular shaped planar portions of the sidewalls on the funnel which extend generally parallel to the horizontal axis of the faceplate as shown in FIG. 8.
  • Television tubes currently are fabricated in several parts, including a funnel having a tubular yoke area, and a neck which extends from the yoke area end of the funnel body and a faceplate.
  • the parts when assembled constitute a television picture bulb which is subsequently evacuated and sealed during manufacture to provide a large hollow glass envelope having a high vacuum within and subject to atmospheric pressures.
  • the funnel is described as that section of the bulb between the faceplate sealing edge and the neck.
  • the yoke area of the funnel is by definition that portion which supports an electronic collar known as a yoke.”
  • the yoke directs the electronic beam within the bulb.
  • the neck is a hollow tubular part which is sealed to the funnel at the yoke area.
  • the electron gun and associated parts are positional in the neck and partially within the funnel.
  • the open end of the tubular neck is sealed about the electron gun.
  • FIG. 2 shows a color television bulb
  • a funnel 11 has a section thereof known as a yoke area 12, funnel walls 23a generally parallel to the horizontal axis and funnel walls 23b generally parallel to the vertical axis, a peripheral edge known as the seal edge 14, and a neck and a faceplate l6 sealed to one end of the funnel 11.
  • the length of the tube d from the faceplate to the edge of the funnel neck has been shortened considerably over the bulbs of the prior art to provide the least commercially practical dimension.
  • the funnel walls 23a, 23b are sharply divergent resulting in a tube with a wide angle of divergence and the funnel 11 has substantially flat central portions 13 in side walls 23a which extend generally parallel to the horizontal axis of the faceplate.
  • Portions 13 are substantially flat in all cross sections and smoothly interconnect with the remainder of the side walls, the yoke area and the sealing portion 14 as shown in FIGS. 2 and 3.
  • a side wall profile is shown in detail in FIG. 2; the phantom line 17 depicts the profile ofa prior art funnel and bulb.
  • FIG. 4 is a side view of a funnel showin'g contour lines at intervals about the funnel.
  • FIG. 5 is a rear view illustrating a generally triangular shaped substantially planar area on a portion of each side wall, an apex 20 and sides formed by a line of intersection with the bulbous portions 21, and a contour line 22. These triangular areas are substantially planar and substantially flat in profile.
  • STRESS PATTERN ANALYSIS Conventionally shaped wide angle television bulbs have been evacuated and the stresses generated have been analyzed by means of strain gauges placed at positions designated in the profiles as A, B, C, D and E, as shown in FIG. 6. The results of this test indicate very high tensile stresses in the portion of the yoke area which is generally parallel to the horizontal axis of the faceplate.
  • a bulb made in accordance with the invention has relatively flat planar wall portions 13 on the sides which are generally parallel to the horizontal axis of the faceplate and which results in a decrease in tension in portions of the yoke area and a decrease in compression on the walls of the funnel to a more desirable level.
  • Example I is a chart indicating the stress pattern as redistributed in comparison with the patterns of the prior art wide-angle television tubes having the typical convex outward curve in profile as illustrated in broken lines in FIG. 2, using glass test bulbs.
  • the novel design reduces compression stress in the yoke area at point D and in the seal edge at point B to either a reduced compression and/or a low tension stress. This is accomplished by providing the planar areas on the funnel walls as described.
  • test tubes show that the tensile strength in an area in which breakage in the prior art has occurred at point A, have been reduced by a factor of about 6; that is, plus 1680 to plus 290 at point A (FIG. 7).
  • High compressive stresses at point D in the neck area were reduced by a factor of 6, that is (1490) to (250) at point D (FIG. 7).
  • tension is present at point E on the modified design, rather than compression at point E as in the prior art bulb.
  • a wide-angle color television picture bulb comprising a generally rectangular glass faceplate having horizontal and vertical axes, said horizontal axis being longer than the vertical axis,
  • said funnel having a generally tubular neck at one end
  • said funnel having a generally tubular flaring yoke area extending from the said neck
  • said funnel having side walls joined to and diverging from said yoke area to an edge portion joined to said faceplate
  • said funnel side walls which extend generally parallel to the horizontal axis of the faceplate having a central portion thereof which is substantially flat in all cross sections thereof and is smoothly interconnected with the remaining portions of said side walls,
  • said funnel side walls which extend generally parallel to the vertical axis of the faceplate having portions thereof which are substantially bowed outwardly relative to said vertical axis and the side walls which extend generally parallel, to the horizontal axis of the faceplate.
  • each said substantially flat wall portion is generally triangular shaped.
  • said funnel having a generally tubular neck at one end
  • said funnel having a generally tubular flaring yoke area extending from the said neck
  • said funnel having side walls joined to and diverging from said yoke area to a portion adapted to be joined to said faceplate,
  • said funnel side walls which are adapted to extend generally parallel to the horizontal axis of the faceplate having a central portion thereof which is substantially flat in all cross sections thereof and is smoothly interconnected with the remaining portions of said side walls,
  • said funnel side walls which are adapted to extend generally parallel to the vertical axis of the faceplate having portions thereof which are substantially bowed outwardly relative to said vertical axis and the side walls WhlCh are adapted to extend

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  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US00044016A 1970-06-08 1970-06-08 Television bulb with improved strength Expired - Lifetime US3720345A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4401670A 1970-06-08 1970-06-08
NL7011800A NL7011800A (enExample) 1970-06-08 1970-08-10

Publications (1)

Publication Number Publication Date
US3720345A true US3720345A (en) 1973-03-13

Family

ID=26644566

Family Applications (1)

Application Number Title Priority Date Filing Date
US00044016A Expired - Lifetime US3720345A (en) 1970-06-08 1970-06-08 Television bulb with improved strength

Country Status (5)

Country Link
US (1) US3720345A (enExample)
DE (1) DE2039504C3 (enExample)
FR (1) FR2095431A5 (enExample)
GB (1) GB1319080A (enExample)
NL (1) NL7011800A (enExample)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029898A (en) * 1976-03-24 1977-06-14 Corning Glass Works Television picture tube face plate
US4483452A (en) * 1981-12-07 1984-11-20 Corning Glass Works Television bulb
US4535907A (en) * 1983-03-09 1985-08-20 Tokyo Shibaura Denki Kabushiki Kaisha Cathode-ray tube
US4537321A (en) * 1983-03-09 1985-08-27 Tokyo Shibaura Denki Kabushiki Kaisha Cathode-ray tube
US4656388A (en) * 1985-05-17 1987-04-07 Zenith Electronics Corporation Tensed mask color cathode ray tube and mask support frame therefore
US5107999A (en) * 1990-03-30 1992-04-28 Videocolor S.P.A. Cathode-ray tube having improved 16×9 aspect ratio faceplate
US5155411A (en) * 1991-02-14 1992-10-13 Thomson Consumer Electronics, Inc. Color CRT assembly having an improved envelope
US5258688A (en) * 1992-04-21 1993-11-02 Zenith Electronics Corporation CRI funnel with concave diagonals
US5751103A (en) * 1996-08-13 1998-05-12 Thomson Consumer Electronics, Inc. Color picture tube having improved funnel
US6002203A (en) * 1996-05-28 1999-12-14 Kabushiki Kaisha Toshiba Cathode ray tube having an envelope shaped to reduce beam deflection power requirements
EP1006555A1 (en) * 1998-11-16 2000-06-07 Samsung Display Devices Co., Ltd. Cathode ray tube
US6392336B1 (en) * 1998-10-06 2002-05-21 Asahi Glass Company Ltd. Glass funnel for a cathode ray tube and cathode ray tube
EP1294010A3 (en) * 2001-09-14 2004-01-07 LG. Philips Displays Korea Co., Ltd. Funnel structure of cathode-ray tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3110930A1 (de) * 1981-03-20 1982-09-30 Standard Elektrik Lorenz Ag, 7000 Stuttgart Bildroehre mit schutzeinrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782953A (en) * 1950-03-13 1957-02-26 Du Mont Allen B Lab Inc Rectangular metal cathode ray tube
US2793319A (en) * 1955-07-26 1957-05-21 Chromatic Television Lab Inc Electron lens structure for television tubes
US3007833A (en) * 1958-12-29 1961-11-07 Dow Chemical Co Method of lamination
US3082513A (en) * 1959-12-21 1963-03-26 Sylvania Electric Prod Fixture
US3213498A (en) * 1962-04-27 1965-10-26 Saint Gobain Method of strengthening glass articles

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL256122A (enExample) * 1959-09-23
US3315035A (en) * 1961-03-29 1967-04-18 Dow Chemical Co Transparent mixed epoxy resin composition and safety laminated articles made therefrom

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782953A (en) * 1950-03-13 1957-02-26 Du Mont Allen B Lab Inc Rectangular metal cathode ray tube
US2793319A (en) * 1955-07-26 1957-05-21 Chromatic Television Lab Inc Electron lens structure for television tubes
US3007833A (en) * 1958-12-29 1961-11-07 Dow Chemical Co Method of lamination
US3082513A (en) * 1959-12-21 1963-03-26 Sylvania Electric Prod Fixture
US3213498A (en) * 1962-04-27 1965-10-26 Saint Gobain Method of strengthening glass articles

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029898A (en) * 1976-03-24 1977-06-14 Corning Glass Works Television picture tube face plate
US4483452A (en) * 1981-12-07 1984-11-20 Corning Glass Works Television bulb
US4535907A (en) * 1983-03-09 1985-08-20 Tokyo Shibaura Denki Kabushiki Kaisha Cathode-ray tube
US4537321A (en) * 1983-03-09 1985-08-27 Tokyo Shibaura Denki Kabushiki Kaisha Cathode-ray tube
US4656388A (en) * 1985-05-17 1987-04-07 Zenith Electronics Corporation Tensed mask color cathode ray tube and mask support frame therefore
US5107999A (en) * 1990-03-30 1992-04-28 Videocolor S.P.A. Cathode-ray tube having improved 16×9 aspect ratio faceplate
US5155411A (en) * 1991-02-14 1992-10-13 Thomson Consumer Electronics, Inc. Color CRT assembly having an improved envelope
US5258688A (en) * 1992-04-21 1993-11-02 Zenith Electronics Corporation CRI funnel with concave diagonals
US6002203A (en) * 1996-05-28 1999-12-14 Kabushiki Kaisha Toshiba Cathode ray tube having an envelope shaped to reduce beam deflection power requirements
EP0810627B1 (en) * 1996-05-28 2004-09-29 Kabushiki Kaisha Toshiba Cathode ray tube
US5751103A (en) * 1996-08-13 1998-05-12 Thomson Consumer Electronics, Inc. Color picture tube having improved funnel
US6392336B1 (en) * 1998-10-06 2002-05-21 Asahi Glass Company Ltd. Glass funnel for a cathode ray tube and cathode ray tube
EP1006555A1 (en) * 1998-11-16 2000-06-07 Samsung Display Devices Co., Ltd. Cathode ray tube
EP1294010A3 (en) * 2001-09-14 2004-01-07 LG. Philips Displays Korea Co., Ltd. Funnel structure of cathode-ray tube

Also Published As

Publication number Publication date
NL7011800A (enExample) 1971-12-10
DE2039504A1 (de) 1972-02-03
FR2095431A5 (enExample) 1972-02-11
GB1319080A (en) 1973-05-31
DE2039504C3 (de) 1983-12-22
DE2039504B2 (de) 1979-06-13

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AS Assignment

Owner name: OWENS-ILLINOIS TELEVISION PRODUCTS INC.,OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OWENS-ILLINOIS, INC., A CORP. OF OHIO;REEL/FRAME:004772/0648

Effective date: 19870323

Owner name: OWENS-ILLINOIS TELEVISION PRODUCTS INC., SEAGATE,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:OWENS-ILLINOIS, INC., A CORP. OF OHIO;REEL/FRAME:004772/0648

Effective date: 19870323