US3450920A - Faceplate with land portions having two cavities for receiving shadow mask support members - Google Patents

Faceplate with land portions having two cavities for receiving shadow mask support members Download PDF

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Publication number
US3450920A
US3450920A US697409A US3450920DA US3450920A US 3450920 A US3450920 A US 3450920A US 697409 A US697409 A US 697409A US 3450920D A US3450920D A US 3450920DA US 3450920 A US3450920 A US 3450920A
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United States
Prior art keywords
display window
mask
edge
shadow mask
tube
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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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US697409A
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English (en)
Inventor
Gunther Engels
Gert Kablitz
Heinrich Wischmann
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US Philips Corp
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US Philips Corp
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Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks

Definitions

  • This wall has thickened portions for supporting the mask each of which has a recess therein extending parallel to the tube axis for receiving a supporting member for the mask as well as a cavity adjacent to the recess for receiving an additional member for preventing displacement of the mask along the tube axls.
  • This invention relates to a device for fastening the shadow mask within the upright edge of the display window of a colour television display tube, the wall of the edge being thickened near the areas at which the mask is supported and each thickened area having a groove-shaped recess the opening of which is directed towards the open side of the edge of the display screen.
  • a hole for receiving the pin of the mask is drilled into the metal part.
  • a centering spindle of the drilling device is placed in the second groove above referred to.
  • German patent specification No. 1,086,813 describes a method in which pins instead of holes are provided in the edge of the display window to fasten the masks. These pins must again be sealed very acurately into the edge at the relevant areas. To permit insertion of the pins the display windows has to be heated to at least 400 C. and further to the softening temperature of the glass at the areas of the pins. In this method, too, the edge itself is deformed and its position changed relative to the surface of the display window, with the same disadvantageous consequences as in the first method described. Since the glass must be softened at the areas of the pins, the pins frequently no longer have the correct positions after cooling of the glass and are, for example, no longer at right angles to the edge. Furthermore difiiculties occur in connection with gas bubbles which are occluded in the glass at the bottom of the pins.
  • the two methods above described also involve the risk that, for example, due to negligence in placing the mask in the window, either one of the pins falls beside its corresponding hole or the hole of a supporting spring comes to lie beside the associated pin so that the perforated mask drops on the phosphor layer present on the inner side of the display window, with the result that mask has to be cleaned and a new phosphor layer applied to the display window.
  • the same thing can happen in taking the mask out of the window.
  • the present invention makes it possible to arrange supporting members for the shadow mask without heating of the display window being required, thus preventing deformation of the edge of the display window with the consequent disadvantages thereof, while it is neither necessary to drill holes in the edge of the display window with narrow tolerances.
  • the device according to the invention for suspension of the shadow mask in the manner above described is characterized in that the thickening of the wall includes a recess extending along the tube axis for receiving the pin or spring connected to the shadow mask as well as a cavity formed next to the recess and at right angles thereto for receiving an additional member which prevents displacement of the mask along the axis of the tube.
  • the cavity may be formed as a through hole in the edge of the display window, in which event a metal sleeve with a. connecting strip for the high voltage is placed in the hole in a vacuum-tight manner. Between a flange of the sleeve and the glass of the window edge, there are arranged a connecting strip and a packing ring engaging the glass.
  • the resilient members according to the invention may be such as to engage at one end in the groove and at their other end in the cavity.
  • the springs may also carry two pins which snap into the groove and into the cavity re spectively.
  • the sleeve may comprise two parts, the part situated inside the tube having a flange which electrically makes contact with a resilient clasp which in turn electrically makes contact with inner coatings present on the edge of the display window, on the display window itself and on the cone of the display tube.
  • FIGURE 1 is a plan view on the display window of a substantially rectangular colour television display tube
  • FIGURE 2 shows part of the upright edge of the display window with one thickened area in which a groove and a cavity according to the invention have been formed;
  • FIGURE 3 is a sectional view of the edge of the display window at the area of the cavity in the form of a hole in which a sleeve is placed;
  • FIGURE 4 is a sectional view of the edge of the display window having a recess according to the invention and a supporting spring carrying a pin, which is secured to the supporting frame of the mask;
  • FIGURE 5 shows another embodiment in a section similar to that of FIGURE 3;
  • FIGURE 6 shows yet another embodiment in a section similar to that of FIGURE 3;
  • FIGURE 7 shows part of a tool (for example a press die) having an exchangeable part for forming the grooves and having a recess for forming the elevation.
  • a tool for example a press die
  • FIGURE 1 shows the upright edge 1 surrounding the display window 2, which together form one glass moulding.
  • the edge 1 is provided with thickened parts 3 of glass at three different areas for supporting the shadow mask.
  • FIGURE 2 shows part of the display window 2 with one thickened part 3.
  • the thickened part has a recess 4 and a cavity 6 which is at right angles thereto.
  • the cavity is ground or milled in the thickened part, after the display window has been moulded and cooled down. If desired, a second cavity 6 may be formed at the other side of the recess 4.
  • FIGURE 3 is a sectional view of the edge of the display window at the level of the cavity 6.
  • the cavity is a bore in which a metal tube 18 having a flange 21 is fitted in a vacuum-tight manner.
  • the sleeve is surrounded between the flange 21 and the glass of the edge 1, by the annular end of a connecting strip 20 for the high voltage supply and a packing ring 19.
  • the packing ring 19, the sleeve 18 and the bore 6 are formed such that the packing ring 19 is not sucked towards the interior of the tube during evacuation.
  • the sleeve 18 may, of course, also be formed differently and, for example, be cemented in a vacuum-tight manner inside the edge 1. In this case the packing ring may be dispensed with.
  • the sleeve is closed in a vacuum-tight manner by means of a partition 22.
  • the sleeve 18 may alternatively comprise two separate parts with a packing between them.
  • the end of the sleeve which lies inside the tube may be threaded internally or externally so that the sleeve may be fixed in position in a vacuum-tight manner using a vacuum cement and a nut.
  • the nut may have the form of a sleeve which receives the pin secured to the spring which is connected to the shadow mask 11.
  • the part located inside the tube may have a flange 26 beneath which a resilient clasp 24 is located, which electrically makes contact with the coating on the edge 1 of the display window and also with the coating on the display window 2 itself.
  • a resilient clasp 24 is located, which electrically makes contact with the coating on the cone 23 sealed to the junction area 25 of the edge 1 of the window.
  • the conventional anode connection on the cone 23 of the tube is thus dispensed with.
  • the shadow mask 11 can also be connected to the part of the sleeve 18 located inside the tube by means of metal springs.
  • the two parts of the sleeve 18 may alternatively be connected without the use of a vacuum-tight partition 22, if the one part is provided with a solid, externally threaded end which is screwed into the other, internally threaded part of the sleeve.
  • the sleeves and the screwthreads must have a length suificient for obtaining a mechanically rigid and vacuum-tight connection and securement of the sleeve 18.
  • FIGURE 4 is a sectional view of the edge 1 of the display window and of the display window 2 and the thickened part 3.
  • the thickened part has a recess 4 with a base 5 which carries a pin 7 secured to a spring 8 so that the spring pushes against the edge of the display window.
  • the spring 8 is secured by means of a rivet or Weld 9 to a frame 10 of the shadow mask.
  • the spring 8 and the pin 7 prevent the shadow mask 11 from shifting in its plane and in the direction at right angles thereto. The mask can thus no longer come in touch with the window 2.
  • FIGURES 5 and 6 are sectional views of the edge 1 of the display window and of the display window 2 and the thickened part 3, the latter being provided with the cavity 6.
  • Three additional springs 13 and 14 respectively are secured to the frame 10 of the mask 11.
  • the springs 13 are provided with pins or earns 12 which snap into the cavity 6 on placing the mask into the window.
  • the springs 14 themselves snap into the cavity 6 when the mask is placed in position.
  • This arrangement affords the advantage that the locations of the cavities 6 formed by grinding or milling are not accurately bound to predetermined tolerances with regard to their distance from the edge 1 and from the inner side of the display window 2, since any deviations are neutralised by the springs 13 and 14, respectively, and hence are rather irrelevant.
  • These additional springs also prevent the mask 11 from shifting relative to the diS- play window in the direction along the tube axis. Since the mask furthermore pushes the pin 7 against the base 5 of the recess 4, the mask is locked against displacement in all directions and cannot fall out of the edge of the display window.
  • the springs 8, 13, 14 may be so formed that one end snaps into the recess 4 and the other snaps into the cavity 6, the spring itself being secured to the frame 10 of the mask. A similar result can be obtained by providing each of the springs 8 and 13 with two pins 7 and 12 respectively.
  • FIGURE 7 shows a portion of a press die 15 for forming the display window, that is to say the edge 1 and the display window 2 itself.
  • the surface of the die has a cavity of suitable shape which serves to form the thickened part 3.
  • a mandrel 16 for pressing the recess 4 in the thickened part 3 is secured in the base of the cavity.
  • the mandrel may be detachably secured and hence be exchanged if the mandrel has worn out to a greater extent than the remaining parts of the die.
  • Means for supporting a shadow mask in a color television display tube having a window with a wall having thickened portions for supporting the mask, each of said thickened wall portions having a groove-shaped recess extending parallel to the tube axis and opening out into the interior of the tube, a support member secured to said mask extending into each of the recesses, each of said wall portions further having a cavity therein adjacent said recess, and an additional support member secured to said mask extending into each of the cavities for preventing displacement of the mask along the tube axis.
  • each spring 9 9 9/ 1959 Wollghtel' et has two pins which snap into the recess and cavity re 9 9 3/ 1960 Hoaglandspectively. 5 3,358,170 12/1967 Fiore.
  • a device as claimed in claim 2 wherein the sleeve comprises two parts of which one is located inside the ROBERT SEGAL: Primary Examinerdisplay tube and has a flange which electrically contact with a resilient clasp making electrical contact with inner coatings present on the wall of the display window, on 10 313-286, 288 the display window and on the cone sealed to the wall of the display window.

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US697409A 1967-01-13 1968-01-12 Faceplate with land portions having two cavities for receiving shadow mask support members Expired - Lifetime US3450920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP0041195 1967-01-13

Publications (1)

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US3450920A true US3450920A (en) 1969-06-17

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US697409A Expired - Lifetime US3450920A (en) 1967-01-13 1968-01-12 Faceplate with land portions having two cavities for receiving shadow mask support members

Country Status (8)

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US (1) US3450920A (fr)
AT (1) AT277331B (fr)
BE (1) BE709345A (fr)
CH (1) CH468714A (fr)
DE (1) DE1512379B2 (fr)
FR (1) FR1550861A (fr)
GB (1) GB1204216A (fr)
NL (1) NL6800277A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3548235A (en) * 1968-07-26 1970-12-15 Philips Corp Face-plate for rectangular color television picture tube with land portions with recesses for receiving shadow mask support members
US3876899A (en) * 1974-06-27 1975-04-08 Gte Sylvania Inc Cathode ray tube electrical connective means
US3898510A (en) * 1974-06-27 1975-08-05 Gte Sylvania Inc Electrical conductive means for traversing a cathode ray tube envelope to effect multiple connections therein
US3904914A (en) * 1974-02-28 1975-09-09 Zenith Radio Corp Color cathode ray tube with internal faceplate and funnel reference surfaces for unique faceplate-funnel relationship
US3969647A (en) * 1973-11-28 1976-07-13 Gte Sylvania Incorporated Cathode ray tube electrical connective traversal incorporating internal shielding and contact means
US4020493A (en) * 1974-12-23 1977-04-26 Zenith Radio Corporation Photographic master for use in screening a color cathode ray tube
US4300071A (en) * 1979-12-10 1981-11-10 Zenith Radio Corporation Four-corner shadow mask suspension system for television cathode ray tubes
US4712041A (en) * 1985-08-20 1987-12-08 Zenith Electronics Corporation Color CRT tension mask support assembly with a glass frame

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906904A (en) * 1956-04-17 1959-09-29 Westinghouse Electric Corp Cathode ray tube
US2928968A (en) * 1959-02-27 1960-03-15 Paramount Pictures Corp Cathode-ray tube switching grid support system
US3358170A (en) * 1962-01-11 1967-12-12 Rauland Corp Color television picture tube and mating support members for mounting the color selection mask within the tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906904A (en) * 1956-04-17 1959-09-29 Westinghouse Electric Corp Cathode ray tube
US2928968A (en) * 1959-02-27 1960-03-15 Paramount Pictures Corp Cathode-ray tube switching grid support system
US3358170A (en) * 1962-01-11 1967-12-12 Rauland Corp Color television picture tube and mating support members for mounting the color selection mask within the tube

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3548235A (en) * 1968-07-26 1970-12-15 Philips Corp Face-plate for rectangular color television picture tube with land portions with recesses for receiving shadow mask support members
US3969647A (en) * 1973-11-28 1976-07-13 Gte Sylvania Incorporated Cathode ray tube electrical connective traversal incorporating internal shielding and contact means
US3904914A (en) * 1974-02-28 1975-09-09 Zenith Radio Corp Color cathode ray tube with internal faceplate and funnel reference surfaces for unique faceplate-funnel relationship
US3876899A (en) * 1974-06-27 1975-04-08 Gte Sylvania Inc Cathode ray tube electrical connective means
US3898510A (en) * 1974-06-27 1975-08-05 Gte Sylvania Inc Electrical conductive means for traversing a cathode ray tube envelope to effect multiple connections therein
US4020493A (en) * 1974-12-23 1977-04-26 Zenith Radio Corporation Photographic master for use in screening a color cathode ray tube
US4300071A (en) * 1979-12-10 1981-11-10 Zenith Radio Corporation Four-corner shadow mask suspension system for television cathode ray tubes
US4712041A (en) * 1985-08-20 1987-12-08 Zenith Electronics Corporation Color CRT tension mask support assembly with a glass frame

Also Published As

Publication number Publication date
DE1512379A1 (de) 1969-12-18
DE1512379B2 (de) 1970-08-13
BE709345A (fr) 1968-07-12
CH468714A (de) 1969-02-15
GB1204216A (en) 1970-09-03
FR1550861A (fr) 1968-12-20
NL6800277A (fr) 1968-07-15
AT277331B (de) 1969-12-29

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