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EP0374572A2 - Cathode avec dispositif de commande pour un tube d'affichage plat et cadre de montage pour un tel arrangement - Google Patents

Cathode avec dispositif de commande pour un tube d'affichage plat et cadre de montage pour un tel arrangement Download PDF

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Publication number
EP0374572A2
EP0374572A2 EP89122355A EP89122355A EP0374572A2 EP 0374572 A2 EP0374572 A2 EP 0374572A2 EP 89122355 A EP89122355 A EP 89122355A EP 89122355 A EP89122355 A EP 89122355A EP 0374572 A2 EP0374572 A2 EP 0374572A2
Authority
EP
European Patent Office
Prior art keywords
frame
arrangement
holding
cathode
pins
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.)
Granted
Application number
EP89122355A
Other languages
German (de)
English (en)
Other versions
EP0374572B1 (fr
EP0374572A3 (fr
Inventor
Manfred Marggraf
Stefan Speh
Kurt-Manfred Tischer
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.)
Panasonic Holdings Corp
Original Assignee
Nokia Unterhaltungselektronik Deutschland GmbH
Nokia Deutschland GmbH
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 Nokia Unterhaltungselektronik Deutschland GmbH, Nokia Deutschland GmbH filed Critical Nokia Unterhaltungselektronik Deutschland GmbH
Publication of EP0374572A2 publication Critical patent/EP0374572A2/fr
Publication of EP0374572A3 publication Critical patent/EP0374572A3/fr
Application granted granted Critical
Publication of EP0374572B1 publication Critical patent/EP0374572B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/126—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using line sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/18—Supports; Vibration-damping arrangements
    • 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
    • H01J29/025—Mounting or supporting arrangements for grids

Definitions

  • the invention relates to an arrangement with an electron-emitting areal cathode and with a control disk arrangement.
  • a control arrangement is used to generate electrons in a flat tube and to influence them in such a way that they strike a screen of the tube at desired locations.
  • Sheet cathodes for flat tubes have been used in many embodiments since the early 1960s. Only those arrangements have proven themselves in which a plurality of heating wire tracks running in parallel are present.
  • An arrangement is known in which a long heating wire is guided around an insulating frame. Numerous arrangements are also known in which individual heating wires are used, each end of which is held by a holding device. All holding devices on one side are attached to a holding arrangement. This in turn is either attached to the inner wall of the envelope of the flat tube or to an inner component.
  • a flat tube is known in which the holding arrangements are attached to the frame of a cathode / control arrangement. Each holding arrangement consists of a glass web, in which parts of holding devices are used.
  • the invention has for its object to provide a cathode / control arrangement for a flat tube, which is simple in construction.
  • the cathode / control arrangement has a frame to which a control disc arrangement is attached. In this frame holding devices for holding heating wires are attached directly.
  • This arrangement has the advantage that the component used to hold the control disk arrangement, namely the frame mentioned, is used directly as a holding arrangement for fastening the holding devices for the heating wires. There is therefore no longer any need for the separate holding arrangements previously used in all known embodiments, which brings about a connection between the holding devices and the frame mentioned.
  • each wire it is advantageous to design at least the holding device on one side of each wire so that it has a tension spring for tensioning the wire held by it. This ensures that the wire remains securely tensioned even when heated to its operating temperature.
  • each holding device has a pin which is insulated in one of two opposite frame webs.
  • the holding devices are particularly easily accessible for welding operations when the pins just mentioned protrude outward from the frame webs, that is to say with their axes inserted into a respective web parallel to the frame plane.
  • a more stable structure with fewer components is obtained if the pins are inserted into the frame webs so that their axes are perpendicular to the frame plane.
  • Frames with inserted straight pins are particularly easy to produce. Components for holding devices can, however, be saved if pins are used which are bent in such a way that clamping plates for the heating wires can be attached directly to them.
  • the frame 10 shown in FIGS. 1 and 2 is made of metal. In its two cross bars 11 there are bores, the axes of which are parallel to the frame plane. A retaining pin 12 is inserted into each hole. Each pin 12 has a smaller diameter than the associated bore. The space between the outer wall of the pin and the inner wall of the bore is filled by an insulating frit layer 13.
  • the frame 10 shown in FIG. 1 is used to manufacture the cathode / control arrangement 14 according to FIG. 2.
  • a control disk arrangement 16 is connected to the underside of the frame 10 via a fritted seam 15, the specific structure of which is not important in the following. Control disk arrangements are known in numerous embodiments.
  • a non-elastic holder 17.ne is attached to the holding pin 12 shown on the left in FIG. 2, while an elastic holder 17.e is fastened to the right holding pin 12.
  • Each holder forms a holding device together with the associated holding pin.
  • the two brackets 17.ne and 17.e hold a heating wire 18 and tension it.
  • numerous heating wires 18 are attached to the frame 10 in order to create a flat cathode.
  • the heating wires are made of common material, e.g. B. tungsten-rhenium, and are covered with a conventional electron-emitting material. They are supplied with voltage via leads 19, which are connected to the holders 17.ne and 17.e, in order to heat them up to a few
  • the non-elastic holder 17.ne is shown in more detail in FIG. 3. It consists of a Z-shaped bracket 20 and a clamping plate 21.
  • the roof of the Z-shaped bracket 20 is placed on the associated retaining pin 12 and welded to it by a laser beam from above. Also by a laser beam coming from above is a Zu line 19 welded to the roof of the bracket 20.
  • the clamping plate 21 is welded to the bottom of the bracket 20. It is bent over and between one end of a heating wire 18 is clamped. In addition to the clamping, the heating wire 18 is also held by a welding spot 22 which is set by a laser beam.
  • the elastic bracket 17.e is shown in more detail. It has an upside-down L-bracket 23, an angle adjustment plate 24, a spring 25, a clamping plate bracket 26 and a clamping plate 21.
  • the L-shaped bracket 23 is placed with its short plate on the associated retaining pin 12 and with this connected via laser welding spots 22.
  • the angle adjustment plate 24 is welded onto its longer leg pointing downward.
  • the spring 25 is connected to the free leg of the V-shaped angle adjustment plate 24.
  • the free leg of the angle adjustment plate 24 assumes such an angle that the spring 25 connected to it extends at an angle of approximately 20 ° to the direction of the transverse webs 11.
  • the clamping plate holding device 26 is attached.
  • FIG. 5 A second embodiment of a frame with retaining pins is shown in FIG. 5 with the aid of a cross section through a cross piece 11.
  • the crosspiece 11 is widened outwards and is now in the widened part Retaining pins 12.2 are used, the axes of which are perpendicular to the frame plane. 5, only a single holding pin 12.2 is shown.
  • This retaining pin is in turn held by a frit layer 13 in a bore in the crosspiece 11.
  • the holder for the heating wire 18 is corresponding to that which was explained with reference to FIG.
  • the advantage of the embodiment explained with reference to FIG. 5 is that the frame is wider and thus more stable than the embodiment of FIGS. 1 and 2. Nevertheless, the overall arrangement does not build wider. Another advantage is that at least one component can be saved in holding devices.
  • the holding devices can be considerably simplified if not straight holding pins 12 or 12.2 are used, but curved ones.
  • the holding pins then also take on the function of holding angles and / or holding plates.
  • FIGS. 6 and 7 An embodiment of holding devices with a curved holding pin 12.3 is explained with reference to FIGS. 6 and 7. These are holding pins which are inserted into a frame 10 according to FIG. 1, that is to say into a frame with bores which run in the direction of the frame plane. The frame and the bores are not shown in FIGS. 6 and 7, but only the front surfaces of frit layers 13, as shown in FIGS. 3 and 4.
  • Each retaining pin 12.3 ver first runs in the frame plane, is then bent at right angles to the side of the frame to which the cathode / control arrangement 14 is to be fastened, and is then bent a second time so that its last piece again runs parallel to the frame plane, but in one Direction that forms an angle of approximately 20 ° with a crosspiece 11.
  • a feed line 19 is welded to the part of each holding pin 12.3 running in the frame plane.
  • an elongated clamping plate 27 is welded at the bottom in order to achieve the non-elastic holder according to FIG. 6, or a spring 25 is attached from the outside, at right angles to the frame plane, in order to provide an elastic holder 17.e according to FIG. 7 to provide.
  • the free end of the spring 25 carries a clamping plate bracket 28, one leg of which is attached to the free end of the spring 25 and the other leg of which is bent over to form a clamping plate which acts in accordance with the clamping plate 21 explained with reference to FIG. 3.
  • the exemplary embodiments shown relate to cases in which all retaining pins 12, 12.2 and 12.3 are each of the same design and are each attached in the same way. However, it is also possible to choose differently designed retaining pins and / or different attachment directions for elastic and non-elastic mounts. It is essential that the pins are fastened directly in the frame that is already present in order to hold a cathode / control arrangement. According to the exemplary embodiments described, this frame is made of metal. For large quantities, cast or pressed glass frames are also inexpensive. The holding pins are advantageously introduced into these during the manufacturing process.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP89122355A 1988-12-22 1989-12-04 Cathode avec dispositif de commande pour un tube d'affichage plat et cadre de montage pour un tel arrangement Expired - Lifetime EP0374572B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3843200 1988-12-22
DE3843200A DE3843200A1 (de) 1988-12-22 1988-12-22 Kathoden/steueranordnung fuer eine flachbildroehre und rahmen fuer eine solche anordnung

Publications (3)

Publication Number Publication Date
EP0374572A2 true EP0374572A2 (fr) 1990-06-27
EP0374572A3 EP0374572A3 (fr) 1991-07-10
EP0374572B1 EP0374572B1 (fr) 1995-02-22

Family

ID=6369822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122355A Expired - Lifetime EP0374572B1 (fr) 1988-12-22 1989-12-04 Cathode avec dispositif de commande pour un tube d'affichage plat et cadre de montage pour un tel arrangement

Country Status (2)

Country Link
EP (1) EP0374572B1 (fr)
DE (2) DE3843200A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR793917A (fr) * 1934-08-23 1936-02-04 M O Valve Co Ltd Support en cantilever pour dispositif électrique à décharge
US2813772A (en) * 1953-08-24 1957-11-19 Chromatic Television Lab Inc Television tube grid structure
GB814296A (en) * 1954-09-25 1959-06-03 Telefunken Gmbh Improved method and means for tautening a filamentary member
US3922578A (en) * 1974-05-01 1975-11-25 Gte Sylvania Inc Large area cathode
EP0266772A2 (fr) * 1986-11-06 1988-05-11 Matsushita Electric Industrial Co., Ltd. Equipement de génération de rayons électroniques
EP0286911A1 (fr) * 1987-04-04 1988-10-19 Nokia Graetz Gesellschaft mit beschränkter Haftung Dispositif à reproduction d'images plates

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR793917A (fr) * 1934-08-23 1936-02-04 M O Valve Co Ltd Support en cantilever pour dispositif électrique à décharge
US2813772A (en) * 1953-08-24 1957-11-19 Chromatic Television Lab Inc Television tube grid structure
GB814296A (en) * 1954-09-25 1959-06-03 Telefunken Gmbh Improved method and means for tautening a filamentary member
US3922578A (en) * 1974-05-01 1975-11-25 Gte Sylvania Inc Large area cathode
EP0266772A2 (fr) * 1986-11-06 1988-05-11 Matsushita Electric Industrial Co., Ltd. Equipement de génération de rayons électroniques
EP0286911A1 (fr) * 1987-04-04 1988-10-19 Nokia Graetz Gesellschaft mit beschränkter Haftung Dispositif à reproduction d'images plates

Also Published As

Publication number Publication date
EP0374572B1 (fr) 1995-02-22
EP0374572A3 (fr) 1991-07-10
DE58909034D1 (de) 1995-03-30
DE3843200A1 (de) 1990-06-28

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