EP0205166A2 - Image tube - Google Patents

Image tube Download PDF

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Publication number
EP0205166A2
EP0205166A2 EP86107963A EP86107963A EP0205166A2 EP 0205166 A2 EP0205166 A2 EP 0205166A2 EP 86107963 A EP86107963 A EP 86107963A EP 86107963 A EP86107963 A EP 86107963A EP 0205166 A2 EP0205166 A2 EP 0205166A2
Authority
EP
European Patent Office
Prior art keywords
display device
image display
security film
frame
fluorescent screen
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
EP86107963A
Other languages
German (de)
French (fr)
Other versions
EP0205166B1 (en
EP0205166A3 (en
Inventor
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
Standard Elektrik Lorenz AG
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, Standard Elektrik Lorenz AG filed Critical Nokia Unterhaltungselektronik Deutschland GmbH
Publication of EP0205166A2 publication Critical patent/EP0205166A2/en
Publication of EP0205166A3 publication Critical patent/EP0205166A3/en
Application granted granted Critical
Publication of EP0205166B1 publication Critical patent/EP0205166B1/en
Expired legal-status Critical Current

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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
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/87—Means for avoiding vessel implosion
    • H01J2229/875—Means substantially covering the output face, e.g. resin layers, protective panels

Definitions

  • the invention relates to an image display device according to the preamble of claim 1.
  • DE-AS 11 1 87 742 discloses a method for producing a coating from a plastic sheet on the end face of a cathode ray tube.
  • the cathode ray tube has a cone with a piston neck as the back and a curved shield trough on the front.
  • the plastic sheet is applied to the outside of the curved screen trough as an anti-explosion protection.
  • a tension band is placed around the circumference of the tube and provided with a tensile stress of approximately 450 kg.
  • This type of explosion protection is only possible in the case of image display devices with a curved screen trough with side parts.
  • the security against implosion is achieved in that the prestressed glass system of the image display device is brought into a tension-free state by mechanical pressure due to the tensioning strap.
  • the invention has for its object to provide an implosion protection for an image display device with a flat fluorescent screen.
  • the image display device contains on the back a metallic trough 1, the edges 2 of which are angled outwards and serve as a support for a spacer frame 3.
  • the flat glass fluorescent screen 4 is arranged on the spacer frame 3.
  • the cathodes, the control structure and the luminescent layer are not shown since these details are not required for the description of the protection against implosion in the image display device.
  • the fluorescent screen 4 carries a security film 5, the edge of which extends to the side surfaces 9 of the fluorescent screen 4.
  • the security film 5 can be glued to the whole surface or only on the side surfaces 9 of the fluorescent screen 4.
  • An acrylate can be used as an adhesive.
  • a security film is understood to be a film that is elastic and can hold back glass parts when the fluorescent screen breaks.
  • the security film can, for example, consist of polyester (polyethylene terephthalate) and be 25 to 60 ⁇ m thick. Such a security film is available under the name "Security film Tesa 4592".
  • a frame 6 is loosely placed around the luminescent screen 4, the upper edge of which is bent in the direction of the outer surface 10 of the luminescent screen 4 and which projects somewhat onto the outer surface 10 of the luminescent screen.
  • the space between the frame 6 and the side surfaces 9 of the fluorescent screen or the security film 5 is filled with a tough elastic potting compound 7.
  • the potting compound 7 can for example consist of polyurethane. Since the security film 5 is usually not scratch-resistant and solvent-resistant, it is covered by a thin glass pane 8.
  • the security film 5 or the glass pane 8 can be colored and thus serve as a contrast pane.
  • the edge of the frame 6 bent towards the outer surface 10 of the fluorescent screen 4 can leave an intermediate space to the security film 5, which is then filled by the sealing compound 7.
  • the edge of the frame 6 can, however, as shown on the left side of the fluorescent screen 4, rest directly on the security film.
  • the potting compound 7 can be introduced from below into the space between the fluorescent screen 4 and the frame 6. Holes 11 can also be present in the frame 6, through which the casting compound 7 is introduced.
  • the security film can be replaced by an applied plastic layer (not shown) if the approximately 1 to 2 mm thick glass pane covers the area between the upper edge of the frame. A composite system similar to the safety glass is then created.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

Bei einer Bildwiedergabevorrichtung mit einem ebenen Leuchtschirm (4) ist als Implosionsschutz eine Sicherheitsfolie (5) auf der Außenfläche (10) und den Seitenflächen (9) des Leuchtschirmes (4) vorhanden. Zusätzlich umgibt ein Rahmen (6) lose den Leuchtschirm. Der sich ergebende Zwischenraum ist mit einer Vergußmasse (7) gefüllt.In the case of an image display device with a flat fluorescent screen (4), a security film (5) is provided on the outer surface (10) and the side surfaces (9) of the fluorescent screen (4) as protection against implosion. In addition, a frame (6) loosely surrounds the fluorescent screen. The resulting space is filled with a potting compound (7).

Description

Die Erfindung bezieht sich auf eine Bildwiedergabevorrichtung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an image display device according to the preamble of claim 1.

Aus der DE-AS 11 1 87 742 ist ein Verfahren zur Herstellung eines Überzugs aus einem Kunststoffblatt auf der Stimfläche einer Kathodenstrahlröhre bekannt. Die Kathodenstrahlröhre weist einen Konus mit Kolbenhals als Rückseite und eine gewölbte Schirmwanne auf der Vorderseite auf. Auf die Außenseite der gewölbten Schirmwanne wird als lmplosionsschutz das Kunststoffblatt aufgebracht. Nach dem Anbringen des Kunststoffblatte-s wird noch ein Spannband um den Umfang der Röhre herumgelegt und mit einer Zugspannung von etwa 450 kg versehen. Diese Art eines lmplosionsschutzes ist nur bei Bildwiedergabevorrichtungen mit einer gewölbten Schirmwanne mit Seitenteilen möglich. Dabei wird die lmplosionssicherheit dadurch erreicht, daß das vorgespannte Glassystem der Bildwiedergabevorrichtung durch mechanischen Druck aufgrund des Spannbandes in einen spannungslosen Zustand gebracht wird.DE-AS 11 1 87 742 discloses a method for producing a coating from a plastic sheet on the end face of a cathode ray tube. The cathode ray tube has a cone with a piston neck as the back and a curved shield trough on the front. The plastic sheet is applied to the outside of the curved screen trough as an anti-explosion protection. After attaching the plastic sheet, a tension band is placed around the circumference of the tube and provided with a tensile stress of approximately 450 kg. This type of explosion protection is only possible in the case of image display devices with a curved screen trough with side parts. The security against implosion is achieved in that the prestressed glass system of the image display device is brought into a tension-free state by mechanical pressure due to the tensioning strap.

Der Erfindung liegt die Aufgabe zugrunde, einen Implosionsschutz für eine Bildwiedergabevorrichtung mit einem ebenen Leuchtschirm anzugeben.The invention has for its object to provide an implosion protection for an image display device with a flat fluorescent screen.

Die Lösung dieser Aufgabe erfolgt mit den im Anspruch 1 angegebenen Mitteln. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen 2 bis 6 angegeben.This object is achieved with the means specified in claim 1. Advantageous embodiments of the invention are specified in subclaims 2 to 6.

Die Erfindung wird nun anhand eines Ausführungsbeispieles näher erläutert. Die einzige Figur der Zeichnung zeigt den Querschnitt durch eine schematisch dargestellte Bildwiedergabevorrichtung.The invention will now be explained in more detail using an exemplary embodiment. The only figure in the drawing shows the cross section through a schematically illustrated image display device.

Die Bildwiedergabevorrichtung enthält auf der Rückseite eine metallische Wanne 1, deren Ränder 2 nach außen abgewinkelt sind und als Auflage für einen Abstandsrahmen 3 dienen. Auf dem Abstandsrahmen 3 ist der ebene gläseme Leuchtschirm 4 angeordnet. Es sind die Kathoden, die Steuerstruktur und die Leuchtschicht nicht dargestellt, da diese Einzelheiten für die Beschreibung des Implosionsschutzes bei der Bildwiedergabevorrichtung nicht benötigt werden.The image display device contains on the back a metallic trough 1, the edges 2 of which are angled outwards and serve as a support for a spacer frame 3. The flat glass fluorescent screen 4 is arranged on the spacer frame 3. The cathodes, the control structure and the luminescent layer are not shown since these details are not required for the description of the protection against implosion in the image display device.

Der Leuchtschirm 4 trägt eine Sicherheitsfolie 5, deren Rand bis auf die Seitenflächen 9 des Leuchtschirmes 4 reicht. Die Sicherheitsfolie 5 kann ganzflächig oder nur an den Seitenflächen 9 des Leuchtschirmes 4 mit diesem verklebt sein. Als Kleber kann ein Acrylat verwendet werden. Unter Sicherheitsfolie wird eine Folie verstanden, die elastisch ist und beim Bruch des Leuchtschirmes Glasteile zurückhalten kann. Die Sicherheitsfolie kann beispielsweise aus Polyester - (Polyethylenterephtalat) bestehen und 25 bis 60 um dick sein. Eine derartige Sicherheitsfolie ist unter dem Namen "Sicherheitsfolie Tesa 4592" erhältlich. Um den Leuchtschirm 4 ist lose ein Rahmen 6 gelegt, dessen oberer Rand in Richtung der Außenfläche 10 des Leuchtschirmes 4 umgebogen ist und der etwas auf die Außenfläche 10 des Leuchtschirmes ragt.The fluorescent screen 4 carries a security film 5, the edge of which extends to the side surfaces 9 of the fluorescent screen 4. The security film 5 can be glued to the whole surface or only on the side surfaces 9 of the fluorescent screen 4. An acrylate can be used as an adhesive. A security film is understood to be a film that is elastic and can hold back glass parts when the fluorescent screen breaks. The security film can, for example, consist of polyester (polyethylene terephthalate) and be 25 to 60 µm thick. Such a security film is available under the name "Security film Tesa 4592". A frame 6 is loosely placed around the luminescent screen 4, the upper edge of which is bent in the direction of the outer surface 10 of the luminescent screen 4 and which projects somewhat onto the outer surface 10 of the luminescent screen.

Der Zwischenraum zwischen dem Rahmen 6 und den Seitenflächen 9 des Leuchtschirmes bzw. der Sicherheitsfolie 5 ist mit einer zähelastischen Vergußmasse 7 ausgefüllt. Die Vergußmasse 7 kann beispielsweise aus Polyurethan bestehen. Da die Sicherheitsfolie 5 meist nicht kratzfest und lösungsmittelbeständig ist, ist sie von einer dünnen Glasscheibe 8 abgedeckt. Die Sicherheitsfoiie 5 oder die Glasscheibe 8 können eingefärbt sein und so als Kontrastscheibe dienen.The space between the frame 6 and the side surfaces 9 of the fluorescent screen or the security film 5 is filled with a tough elastic potting compound 7. The potting compound 7 can for example consist of polyurethane. Since the security film 5 is usually not scratch-resistant and solvent-resistant, it is covered by a thin glass pane 8. The security film 5 or the glass pane 8 can be colored and thus serve as a contrast pane.

Wie in der Zeichnung an der rechten Seite des Leuchtschirmes 4 dargestellt, kann der zur Außenfläche 10 des Leuchtschirmes 4 gebogene Rand des Rahmens 6 einen Zwischenraum zur Sicherheitsfolie 5 lassen, der dann von der Vergußmasse 7 ausgefüllt wird. Der Rand des Rahmens 6 kann aber auch, wie an der linken Seite des Leuchtschirmes 4 dargestellt, direkt auf der Sicherheitsfolie aufliegen. Das Einbringen der Vergußmasse 7 kann von unten her in den Zwischenraum zwischen dem Leuchtschirm 4 und dem Rahmen 6 erfolgen. Im Rahmen 6 können aber auch Löcher 11 vorhanden sein, durch die die Vergußmasse 7 eingebracht wird.As shown in the drawing on the right-hand side of the fluorescent screen 4, the edge of the frame 6 bent towards the outer surface 10 of the fluorescent screen 4 can leave an intermediate space to the security film 5, which is then filled by the sealing compound 7. The edge of the frame 6 can, however, as shown on the left side of the fluorescent screen 4, rest directly on the security film. The potting compound 7 can be introduced from below into the space between the fluorescent screen 4 and the frame 6. Holes 11 can also be present in the frame 6, through which the casting compound 7 is introduced.

Bei einem lmplosionstest einer Bildwiedergabevorrichtung mit dem beschriebenen Aufbau zeigte sich, daß der Leuchtschirm 4 am Ort der größten Spannung im Glas zersprang. Die Sicherheitsfolie 5 hielt die Glasteile zusammen und der Rahmen 6 dämpfte die Schwingung des Leuchtschirms 4 derart, daß diese sich nicht vom Rand 2 der Wanne 1 löste. Das bedeutet, daß der vorstehend beschriebene Implosionsschutz für eine flache Bildwiedergabevorrichtung ausreichend ist.In an implosion test of an image display device with the structure described, it was found that the fluorescent screen 4 shattered in the glass at the location of the greatest tension. The security film 5 held the glass parts together and the frame 6 dampened the vibration of the fluorescent screen 4 in such a way that it did not detach from the edge 2 of the tub 1. This means that the implosion protection described above is sufficient for a flat image display device.

Die Sicherheitsfolie kann durch eine aufgebrachte Kunststoffschicht ersetzt werden (nicht dargestellt), wenn die etwa 1 bis 2 mm dicke Glasscheibe das Gebiet zwischen dem oberen Rand des Rahmens abdeckt. Es entsteht dann ein ähnlich dem Sicherheitsglas aufgebautes Verbundsystem.The security film can be replaced by an applied plastic layer (not shown) if the approximately 1 to 2 mm thick glass pane covers the area between the upper edge of the frame. A composite system similar to the safety glass is then created.

Claims (6)

1. Bildwiedergabevorrichtung mit einem Kolben als Rückseite und einem Leuchtschirm auf der Vorderseite, der mit einer Kunststoffschicht überzogen und von einem Band umgeben ist, dadurch gekennzeichnet, daß die Außenfläche (10) und die Seitenflächen (9) des ebenen Leuchtschirmes (4) mit einer Sicherheitsfolie (5) aus Kunststoff überzogen sind, die Seitenflächen (9) mit Abstand von einem im Querschnitt L-förmigen Rahmen (6) umfaßt sind und daß der Raum zwischen den Seitenflächen (9) und dem Rahmen (6) mit Vergußmasse (7) gefüllt ist.1. Image display device with a piston as the back and a luminescent screen on the front, which is covered with a plastic layer and surrounded by a tape, characterized in that the outer surface (10) and the side surfaces (9) of the flat luminescent screen (4) with a Security film (5) made of plastic, the side surfaces (9) are spaced from a cross-sectionally L-shaped frame (6) and that the space between the side surfaces (9) and the frame (6) with potting compound (7) is filled. 2. Bildwiedergabevorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Vergußmasse (7) zähelastisch ist.2. Image display device according to claim 1, characterized in that the sealing compound (7) is viscoplastic. 3. Bildwiedergabevorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Vergußmasse (7) aus Polyurethan besteht.3. Picture display device according to claim 2, characterized in that the casting compound (7) consists of polyurethane. 4. Bildwiedergabevorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Rahmen (6) Löcher (11) aufweist.4. Image display device according to claim 1, characterized in that the frame (6) has holes (11). 5. Bildwiedergabevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Sicherheitsfolie (5) von einer dünnen Glasscheibe (8) abgedeckt ist.5. Image display device according to one of the preceding claims, characterized in that the security film (5) is covered by a thin glass pane (8). 6. Bildwiedergabevorrichtung nach Anspruch 1 oder 5, dadurch gekennzeichnet, daß die Sicherheitsfolie (5) oder die Glasscheibe (8) eingefärbt sind.6. Image display device according to claim 1 or 5, characterized in that the security film (5) or the glass pane (8) are colored.
EP86107963A 1985-06-14 1986-06-11 Image tube Expired EP0205166B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3521315 1985-06-14
DE19853521315 DE3521315A1 (en) 1985-06-14 1985-06-14 IMAGE DISPLAY DEVICE

Publications (3)

Publication Number Publication Date
EP0205166A2 true EP0205166A2 (en) 1986-12-17
EP0205166A3 EP0205166A3 (en) 1987-12-23
EP0205166B1 EP0205166B1 (en) 1989-08-30

Family

ID=6273241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107963A Expired EP0205166B1 (en) 1985-06-14 1986-06-11 Image tube

Country Status (5)

Country Link
US (1) US4709272A (en)
EP (1) EP0205166B1 (en)
JP (1) JPH0754674B2 (en)
CA (1) CA1270891A (en)
DE (2) DE3521315A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0387738A1 (en) * 1989-03-13 1990-09-19 Matsushita Electric Industrial Co., Ltd. Flat panel display device
US4991304A (en) * 1987-06-11 1991-02-12 Renishaw Workpiece inspection method
EP0527343A2 (en) * 1991-08-14 1993-02-17 International Business Machines Corporation Plate-shaped component surrounded by a sealing on its lateral faces

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63198243A (en) * 1987-02-12 1988-08-16 Mitsubishi Electric Corp Explosion-proof type cathode-ray tube
US5074644A (en) * 1987-09-18 1991-12-24 Pioneer Electronic Corporation Rear projection television
US4992881A (en) * 1989-04-14 1991-02-12 Honeywell Inc. Protective cover for flight instrument filter glass
US5072301A (en) * 1990-03-12 1991-12-10 Zenith Electronics Corporation Apparatus and process for implosion protection in cathode ray tubes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1187742B (en) * 1961-11-13 1965-02-25 Rca Corp Process for the production of a cover from a plastic sheet on the end face of a cathode ray tube
FR1477706A (en) * 1966-03-10 1967-04-21 Saint Gobain Further training in the manufacture of cathode-ray tubes, in particular for color television
US4016364A (en) * 1975-10-20 1977-04-05 Zenith Radio Corporation Color television picture tubes with improved implosion protection system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009017A (en) * 1953-05-22 1961-11-14 Libbey Owens Ford Glass Co Laminated television screen
NL280647A (en) * 1963-07-05 1964-12-10

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1187742B (en) * 1961-11-13 1965-02-25 Rca Corp Process for the production of a cover from a plastic sheet on the end face of a cathode ray tube
FR1477706A (en) * 1966-03-10 1967-04-21 Saint Gobain Further training in the manufacture of cathode-ray tubes, in particular for color television
US4016364A (en) * 1975-10-20 1977-04-05 Zenith Radio Corporation Color television picture tubes with improved implosion protection system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991304A (en) * 1987-06-11 1991-02-12 Renishaw Workpiece inspection method
EP0387738A1 (en) * 1989-03-13 1990-09-19 Matsushita Electric Industrial Co., Ltd. Flat panel display device
US5031788A (en) * 1989-03-13 1991-07-16 Matsushita Electric Industrial Co., Ltd. Flat panel display device
US5085334A (en) * 1989-03-13 1992-02-04 Matsushita Electric Industrial Co., Ltd. Flat panel display device
EP0527343A2 (en) * 1991-08-14 1993-02-17 International Business Machines Corporation Plate-shaped component surrounded by a sealing on its lateral faces
EP0527343A3 (en) * 1991-08-14 1993-04-07 International Business Machines Corporation Plate-shaped component surrounded by a sealing on its lateral faces
US5364673A (en) * 1991-08-14 1994-11-15 International Business Machines Corporation Transparent plate-shaped component having a stepped edge totally surrounded by a seal

Also Published As

Publication number Publication date
EP0205166B1 (en) 1989-08-30
EP0205166A3 (en) 1987-12-23
DE3665377D1 (en) 1989-10-05
US4709272A (en) 1987-11-24
DE3521315A1 (en) 1986-12-18
JPH0754674B2 (en) 1995-06-07
CA1270891A (en) 1990-06-26
JPS61288356A (en) 1986-12-18

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