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EP0162972B1 - Projection cathode ray tube - Google Patents

Projection cathode ray tube Download PDF

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Publication number
EP0162972B1
EP0162972B1 EP84200785A EP84200785A EP0162972B1 EP 0162972 B1 EP0162972 B1 EP 0162972B1 EP 84200785 A EP84200785 A EP 84200785A EP 84200785 A EP84200785 A EP 84200785A EP 0162972 B1 EP0162972 B1 EP 0162972B1
Authority
EP
European Patent Office
Prior art keywords
window
cooling
space
tube
picture
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
Application number
EP84200785A
Other languages
German (de)
French (fr)
Other versions
EP0162972A1 (en
Inventor
Albert Dr. Comberg
Alwin Knops
Heinrich Oepen
Dieter Wädow
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.)
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Priority to EP84200785A priority Critical patent/EP0162972B1/en
Priority to DE8484200785T priority patent/DE3474484D1/en
Priority to US06/738,107 priority patent/US4651047A/en
Priority to ES543605A priority patent/ES8608732A1/en
Priority to DD85276814A priority patent/DD237948A5/en
Priority to JP60115507A priority patent/JPH067460B2/en
Priority to KR1019850003812A priority patent/KR920010664B1/en
Publication of EP0162972A1 publication Critical patent/EP0162972A1/en
Application granted granted Critical
Publication of EP0162972B1 publication Critical patent/EP0162972B1/en
Expired 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
    • 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
    • H01J29/006—Arrangements for eliminating unwanted temperature effects

Definitions

  • the invention relates to a projection television picture tube with an evacuated casing with a picture window, which is provided with a screen on the inside and in front of which a translucent second window is arranged on the outside, the space between the picture window and the second window of at least one inflow opening flows to at least one outflow opening, a cooling liquid.
  • Such a picture tube is known from the published Dutch patent application 8 003 360.
  • a raster is described on the screen, which usually has a phosphor layer or a pattern of different phosphors.
  • Electron bombardment increases the temperature of the phosphor, which reduces the light output of the screen ("thermal quenching").
  • This phenomenon occurs in particular in picture tubes for projection television, with electron beams being scanned with large beam currents in order to obtain the required high luminance levels of the screens.
  • the temperature of the image window increases and a temperature gradient arises at the image window. This gradient causes a mechanical stress in which e.g. Picture window made of glass.
  • thermal stress With a high electron beam current and consequently high thermal stress, this can lead to a break in the image window.
  • thermal stress thermo stress
  • the space between the image window and the second window filled with coolant is surrounded at the top, bottom and side by a metal heat sink serving as a spacer and acting as a heat radiator. Due to the temperature rise of the picture window, the cooling liquid warmed by the picture window moves upwards along the picture window and downwards along the second window, whereby the heat is also dissipated from the center of the picture window via the heat sink.
  • the heat is dissipated mainly by conduction to the second window.
  • the liquid flow described above occurs, with an associated but ineffective additional cooling by the heat sink.
  • the cooling liquid is exposed to cooling outside the room.
  • the cooling liquid is supplied from the top of the room through pipes or hoses and through a cooling chamber to the underside of the room, namely through flow due to temperature differences in the cooling liquid.
  • a disadvantage of such a tube is that when the tube is replaced in a projector, the cooling liquid has to be removed and the hoses or tubes have to be detached from the picture tube.
  • the object of the invention is to create a picture tube with a more effective cooling system based on the prior art described above, so that effective cooling results in a power of up to 40 W.
  • the invention also has the task of creating a picture tube with an essentially homogeneous temperature distribution over the screen.
  • the invention also has the task of creating a picture tube with cooling without additional tubes and individual heat exchangers.
  • a picture tube of the type described at the outset according to the invention is characterized in that a cooling jacket is arranged at the height of the windows and around the space mentioned, which is provided with at least one channel and a pump with pump connecting pieces which hold the cooling liquid lead from the outflow to the inflow opening or openings of said space.
  • the supply of coolant is to be dimensioned such that its heat capacity is sufficient to dampen short-term temperature fluctuations due to the changing load on the screen.
  • the coolant With this cooling, the coolant generally flows laminarly along the warm picture window and absorbs heat there.
  • the coolant is then pumped from the outflow opening (s) through the channel in the cooling jacket where the cooling liquid releases its heat to the cooling jacket. Due to the circulation of the liquid, better and more homogeneous temperature regulation is achieved than with the known cooling systems with a simple cooling chamber. This further reduces the tension in the glass of the picture tube.
  • Another advantage of the picture tube according to the invention is that no external tubes and hoses are necessary for connection to a heat exchanger and the pump, which makes it much easier to mount the tube in a (projection) arrangement for displaying images.
  • the cooling in a picture tube according to the invention is considerably more effective than the cooling described in the first exemplary embodiment of the already mentioned Dutch patent application 8003360, because the cooling liquid between the picture window and the second window is pumped mainly in only one direction and is cooled in the cooling jacket.
  • the pump can be located anywhere in the channel between the outflow opening and the inflow opening.
  • One of the pump connections is preferably connected to an inflow or outflow opening or openings, the other pump connection opening into the channel.
  • the inflow or outflow opening or openings pass into a substantially smooth transition into an initially widening chamber, the chamber being connected to one of the pump connections.
  • At least the outer wall of the cooling jacket is preferably made of metal and is optionally provided with cooling fins. It is possible to force the ribs to cool with air.
  • a preferred embodiment of a picture tube according to the invention is characterized in that the space mentioned, through which the cooling liquid flows, through two seals extending parallel to the direction of flow in the space, e.g. Glass or metal strips, between the picture window and the second window is limited. If two stripes are used on the two sides of the image window, they can also act as spacers between the image window and the second window.
  • the second window prefferably be the first element of the optical lens system of the image display device.
  • the picture window is attached to the cone of the tube with a glass enamel, it is advantageous to arrange the adhesive seam formed in this way in the wall of the channel. As a result, the coolant also flows around this heat-sensitive point, thereby avoiding the occurrence of thermal stresses.
  • FIG. 1 a partially cut side view of a picture tube according to the invention is shown.
  • This picture tube contains a shell 1, which consists of a neck 2 and a cone 3 and is closed with a picture window 4.
  • a screen 5 is arranged on the inside of this picture window.
  • a translucent second window 6 is provided essentially parallel to the outside of the image window 4.
  • a cooling jacket 8 is provided around the tube end at the level of the windows 4 and 6 and the space 7 lying between them.
  • This cooling jacket contains a channel 9 through an outer wall 10 of the cooling jacket, the side edge 11 of the second window 6, a glass strip 12 (see FIG. 2), the edge of the picture window 4, the edge of the cone 14 and the rear wall 15 of the cooling jacket is limited.
  • any expansion differences between the outer wall 10 and the tube end can be compensated for by the flexible rear wall 15 of the cooling jacket.
  • a pump 16 with a motor M and a pump part P with two connections 17 and 18 is arranged in the cooling jacket 8.
  • the pump connector 18 is connected via a pipe 19 to an expanding chamber 20 which adjoins the inlet opening 21 of the room 7. This transition should be as smooth or smooth as possible in order to avoid turbulence and the associated refractive index fluctuations in the cooling liquid in space 7.
  • the outer wall 10 of the cooling jacket 8 is zigzag-shaped, whereby cooling fins are formed.
  • the outer wall 10 suitably consists of aluminum or a material with a similarly high thermal conductivity. Silicone rubber is preferably used as the sealing compound 22 since it has great plasticity over a wide temperature range.
  • the space 7, the channel 9 and the pump 16 are filled with cooling liquid (for example water or an ethylene glycol / water mixture with a lower melting point and a higher boiling point than water).
  • cooling liquid for example water or an ethylene glycol / water mixture with a lower melting point and a higher boiling point than water.
  • the heat generated in the screen is absorbed by the coolant through the image window.
  • the warm coolant is conveyed from the room 7 into the channel 9 by the pump.
  • the cooling liquid partially emits the heat absorbed therein by the wall 10 and the rear wall 15 of the cooling jacket and is pumped back into the room 7 by the pump.
  • the direction of flow of the coolant is indicated by arrows; the pump direction can of course also be reversed.
  • the tube also has a tube base 23 with connecting pins 24.
  • FIG. 2 shows a partially cut side view perpendicular to the view according to FIG. 1.
  • the reference numerals correspond to those in FIG. 1.
  • FIG. 1 shows a front view (front view) of the tube according to FIGS. 1 and 2.
  • the reference numerals again correspond to those in FIG. 1.
  • the position of the seals and the flow directions indicated by arrows can be seen particularly clearly in FIG.
  • the cooling jacket 8 is shown here in a circle, but, like the picture window, it can also be essentially rectangular.
  • the channel 9 can also consist of two sub-channels.
  • the picture tubes in a picture display device need not be arranged horizontally (picture window vertical), they can also be arranged and operated more or less vertically (picture window horizontal).

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Projection Apparatus (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)

Description

Die Erfindung bezieht sich auf,eine Projektionsfernsehbildröhre mit einer evakuierten Hülle mit einem Bildfenster, das an der Innenseite mit einem Bildschirm versehen ist und vor dem auf der Aussenseite ein lichtdurchlässiges zweites Fenster angeordnet ist, wobei durch den Raum zwischen dem Bildfenster und dem zweiten Fenster von mindestens einer Einströmungsöffnung zu mindestens einer Ausströmungsöffnung eine Kühlflüssigkeit strömt.The invention relates to a projection television picture tube with an evacuated casing with a picture window, which is provided with a screen on the inside and in front of which a translucent second window is arranged on the outside, the space between the picture window and the second window of at least one inflow opening flows to at least one outflow opening, a cooling liquid.

Eine derartige Bildröhre ist aus der offengelegten niederländischen Patentanmeldung 8 003 360 bekannt. Mit Hilfe eines Elektronenstrahles wird an dem Bildschirm, der meistens eine Phosphorschicht oder ein Muster unterschiedlicher Phosphore aufweist, ein Raster beschrieben. Durch den Elektronenbeschuss nimmt die Temperatur des Phosphors zu, wodurch der Lichtertrag des Bildschirms abnimmt («thermal quenching»). Diese Erscheinung tritt insbesondere bei Bildröhren für Projektionsfernsehen auf, wobei zum Erhalten der erforderlichen grossen Leuchtdichten der Bildschirme durch Elektronenstrahlen mit grossen Strahlströmen abgetastet wird. Zugleich nimmt die Temperatur des Bildfensters zu und es entsteht ein Temperaturgradient an dem Bildfenster. Dieser Gradient verursacht eine mechanische Spannung in dem z.B. aus Glas bestehenden Bildfenster. Bei hohem Elektronenstrahlstrom und folglich hoher thermischer Belastung kann dies zu einem Bruch des Bildfensters führen. Um diese mechanischen Spannungen in dem Bildfenster durch Temperaturunterschiede («thermal stress») zu verringern und die Verringerung des Lichtertrags zu vermeiden, ist es aus der bereits genannten niederländischen Patentanmeldung 8003360 bekannt, das Bildfenster und den damit verbundenen Bildschirm zu kühlen. Der mit Kühlflüssigkeit gefüllte Raum zwischen dem Bildfenster und dem zweiten Fenster ist bei einer ersten beschriebenen Ausführungsform oben, unten und seitlich von einem als Distanzglied dienenden und als Wärmestrahler wirkenden metallenen Kühlkörper umgeben. Durch den Temperaturanstieg des Bildfensters bewegt sich die durch das Bildfenster angewärmte Kühlflüssigkeit am Bildfenster entlang nach oben und am zweiten Fenster entlang nach unten, wodurch auch die Wärme von der Mitte des Bildfensters über den Kühlkörper abgeführt wird. Bei geringer Belastung, beispielsweise weniger als 5 W, wird die Wärme hauptsächlich durch Leitung zu dem zweiten Fenster abgeführt. Bei höherer Belastung tritt die oben beschriebene Flüssigkeitsströmung auf, mit einer damit einhergehenden, aber wenig wirksamen zusätzlichen Kühlung durch den Kühlkörper. Ausserdem ist eine Ausführungsform beschrieben worden, bei der die Kühlflüssigkeit ausserhalb des Raumes einer Kühlung ausgesetzt wird. Dazu wird die Kühlflüssigkeit von der Oberseite des Raumes durch Rohre oder Schläuche und durch eine Kühlkammer der Unterseite des Raumes zugeführt, und zwar durch Strömung infolge von Temperaturunterschieden in der Kühlflüssigkeit. Ein Nachteil einer derartigen Röhre ist, dass bei Ersatz der Röhre in einem Projektor die Kühlflüssigkeit entfernt werden muss und die Schläuche bzw. Rohre von der Bildröhre gelöst werden müssen.Such a picture tube is known from the published Dutch patent application 8 003 360. With the help of an electron beam, a raster is described on the screen, which usually has a phosphor layer or a pattern of different phosphors. Electron bombardment increases the temperature of the phosphor, which reduces the light output of the screen ("thermal quenching"). This phenomenon occurs in particular in picture tubes for projection television, with electron beams being scanned with large beam currents in order to obtain the required high luminance levels of the screens. At the same time, the temperature of the image window increases and a temperature gradient arises at the image window. This gradient causes a mechanical stress in which e.g. Picture window made of glass. With a high electron beam current and consequently high thermal stress, this can lead to a break in the image window. In order to reduce these mechanical stresses in the picture window due to temperature differences (“thermal stress”) and to avoid the reduction in the light output, it is known from the already mentioned Dutch patent application 8003360 to cool the picture window and the screen connected to it. In a first embodiment, the space between the image window and the second window filled with coolant is surrounded at the top, bottom and side by a metal heat sink serving as a spacer and acting as a heat radiator. Due to the temperature rise of the picture window, the cooling liquid warmed by the picture window moves upwards along the picture window and downwards along the second window, whereby the heat is also dissipated from the center of the picture window via the heat sink. At low loads, for example less than 5 W, the heat is dissipated mainly by conduction to the second window. At higher loads, the liquid flow described above occurs, with an associated but ineffective additional cooling by the heat sink. In addition, an embodiment has been described in which the cooling liquid is exposed to cooling outside the room. For this purpose, the cooling liquid is supplied from the top of the room through pipes or hoses and through a cooling chamber to the underside of the room, namely through flow due to temperature differences in the cooling liquid. A disadvantage of such a tube is that when the tube is replaced in a projector, the cooling liquid has to be removed and the hoses or tubes have to be detached from the picture tube.

Die Erfindung hat nun die Aufgabe, ausgehend von dem obenstehend beschriebenen Stand der Technik eine Bildröhre mit einem wirksameren Kühlsystem zu schaffen, so dass sich eine wirksame Kühlung bei einer Leistung bis 40 W ergibt.The object of the invention is to create a picture tube with a more effective cooling system based on the prior art described above, so that effective cooling results in a power of up to 40 W.

Die Erfindung hat ausserdem die Aufgabe, eine Bildröhre mit einer im wesentlichen homogenen Temperaturverteilung über den Bildschirm zu schaffen.The invention also has the task of creating a picture tube with an essentially homogeneous temperature distribution over the screen.

Die Erfindung hat ferner noch die Aufgabe, eine Bildröhre mit einer Kühlung ohne zusätzliche Rohre und einzelne Wärmeaustauscher zu schaffen.The invention also has the task of creating a picture tube with cooling without additional tubes and individual heat exchangers.

Zur Lösung dieser Aufgaben weist eine Bildröhre der eingangs beschriebenen Art nach der Erfindung das Kennzeichen auf, dass in Höhe der Fenster und um den genannten Raum herum ein Kühlmantel angeordnet ist, der mit mindestens einem Kanal und einer Pumpe mit Pumpstutzen versehen ist, die die Kühlflüssigkeit von der Ausströmungs- zu der Einströmungsöffnung bzw. -öffnungen des genannten Raumes führen.To solve these problems, a picture tube of the type described at the outset according to the invention is characterized in that a cooling jacket is arranged at the height of the windows and around the space mentioned, which is provided with at least one channel and a pump with pump connecting pieces which hold the cooling liquid lead from the outflow to the inflow opening or openings of said space.

Die Umwälzung der Kühlflüssigkeit und damit der grösste Teil des Wärmeabtransports vom Ort der Wärmeerzeugung, also vom Bildschirm, erfolgt bei der erfindungsgemässen Bildröhre durch erzwungene Konvektion mittels der Pumpe. Der Vorrat an Kühlflüssigkeit ist so zu bemessen, dass deren Wärmekapazität ausreicht, um kurzfristige Temperaturschwankungen infolge wechselnder Belastung des Bildschirms zu dämpfen. Bei dieser Kühlung stömt die Kühlflüssigkeit im allgemeinen laminar an dem warmen Bildfenster entlang und nimmt dort Wärme auf. Die Kühlflüssigkeit wird daraufhin mit der Pumpe von der (den) Ausströmungsöffnung bzw. -öffnungen durch den Kanal in dem Kühlmantel gefördert, wo die Kühlflüssigkeit ihre Wärme an den Kühlmantel abgibt. Durch den Kreislauf der Flüssigkeit wird eine bessere und homogenere Temperaturregulierung als bei den bekannten Kühlsystemen mit einer einfachen Kühlkammer erzielt. Dadurch wird die Spannung in dem Glas der Bildröhre weiter verringert.In the picture tube according to the invention, the circulation of the cooling liquid and thus most of the heat removal from the place where the heat is generated, that is to say from the screen, takes place by forced convection by means of the pump. The supply of coolant is to be dimensioned such that its heat capacity is sufficient to dampen short-term temperature fluctuations due to the changing load on the screen. With this cooling, the coolant generally flows laminarly along the warm picture window and absorbs heat there. The coolant is then pumped from the outflow opening (s) through the channel in the cooling jacket where the cooling liquid releases its heat to the cooling jacket. Due to the circulation of the liquid, better and more homogeneous temperature regulation is achieved than with the known cooling systems with a simple cooling chamber. This further reduces the tension in the glass of the picture tube.

Ein weiterer Vorteil der erfindungsgemässen Bildröhre ist, dass keine äusseren Rohre und Schläuche zur Verbindung mit einem Wärmeaustauscher und der Pumpe notwendig sind, wodurch eine viel einfachere Montage der Röhre in einer (Projektions)-Anordnung zum Wiedergeben von Bildern möglich ist.Another advantage of the picture tube according to the invention is that no external tubes and hoses are necessary for connection to a heat exchanger and the pump, which makes it much easier to mount the tube in a (projection) arrangement for displaying images.

Die Kühlung bei einer erfindungsgemässen Bildröhre ist wesentlich wirksamer als die in dem ersten Ausführungsbeispiel der bereits genannten niederländischen Patentanmeldung 8003360 beschriebene Kühlung, weil die Kühlflüssigkeit zwischen dem Bildfenster und dem zweiten Fenster hauptsächlich in nur einer Richtung gepumpt wird und in dem Kühlmantel gekühlt wird. Die Pumpe kann irgendwo in dem Kanal zwischen Ausströmungsöffnung und Einströmungsöffnung angeordnet sein. Vorzugsweise ist einer der Pumpstutzen an einer Ein- oder Ausströmungsöffnung oder -öffnungen angeschlossen, wobei der andere Pumpstutzen in den Kanal mündet.The cooling in a picture tube according to the invention is considerably more effective than the cooling described in the first exemplary embodiment of the already mentioned Dutch patent application 8003360, because the cooling liquid between the picture window and the second window is pumped mainly in only one direction and is cooled in the cooling jacket. The pump can be located anywhere in the channel between the outflow opening and the inflow opening. One of the pump connections is preferably connected to an inflow or outflow opening or openings, the other pump connection opening into the channel.

Um das Auftreten von Turbulenzen und den damit verbundenen Brechungsindexschwankungen noch sicherer zu vermeiden, ist bei einer vorzugsweisen Ausführungsform der Erfindung vorgesehen, dass die Ein- oder Ausströmungsöffnung oder -öffnungen in einem im wesentlichen gleitenden Übergang in eine sich anfangs erweiternde Kammer übergeht bzw. übergehen, wobei die Kammer an einen der Pumpstutzen angeschlossen ist.In order to prevent the occurrence of turbulence and the associated refractive index fluctuations even more reliably, it is provided in a preferred embodiment of the invention that the inflow or outflow opening or openings pass into a substantially smooth transition into an initially widening chamber, the chamber being connected to one of the pump connections.

Wenigstens die Aussenwand der Kühlmantels besteht vorzugsweise aus Metall und ist gegebenenfalls mit Kühlrippen versehen. Es ist möglich, die Rippen forciert mit Luft zu kühlen.At least the outer wall of the cooling jacket is preferably made of metal and is optionally provided with cooling fins. It is possible to force the ribs to cool with air.

Eine bevorzugte Ausführungsform einer erfindungsgemässen Bildröhre weist das Kennzeichen auf, dass der genannte Raum, durch den die Kühlflüssigkeit hindurchströmt, durch zwei parallel zu der Strömungsrichtung in dem Raum sich erstreckende Abdichtungen, z.B. Glas- oder Metallstreifen, zwischen dem Bildfenster und dem zweiten Fenster begrenzt ist. Wenn zwei Streifen an den zwei Seiten des Bildfensters verwendet werden, können sie zugleich als Distanzelemente zwischen dem Bildfenster und dem zweiten Fenster wirksam sein.A preferred embodiment of a picture tube according to the invention is characterized in that the space mentioned, through which the cooling liquid flows, through two seals extending parallel to the direction of flow in the space, e.g. Glass or metal strips, between the picture window and the second window is limited. If two stripes are used on the two sides of the image window, they can also act as spacers between the image window and the second window.

Auch ist es möglich, dass das zweite Fenster das erste Element des optischen Linsensystems der Bildwiedergabeanordnung ist.It is also possible for the second window to be the first element of the optical lens system of the image display device.

Wenn das Bildfenster mit einer Glas-Emaille am Konus der Röhre befestigt ist, ist es vorteilhaft, die derart gebildete Klebnaht in der Wand des Kanals anzuordnen. Dadurch wird auch diese wärmeempfindliche Stelle von der Kühlflüssigkeit umströmt, wodurch das Auftreten von Wärmespannungen vermieden wird.If the picture window is attached to the cone of the tube with a glass enamel, it is advantageous to arrange the adhesive seam formed in this way in the wall of the channel. As a result, the coolant also flows around this heat-sensitive point, thereby avoiding the occurrence of thermal stresses.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen

  • Fig.1 eine teilweise aufgeschnittene Seitenansicht einer Bildröhre nach der Erfindung,
  • Fig. 2 eine teilweise aufgeschnittene Seitenansicht senkrecht zur Ansicht nach Fig. 1 und
  • Fig. eine Frontansicht (Vorderansicht) der Röhre nach den Fig. 1 und 2.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it
  • 1 is a partially cutaway side view of a picture tube according to the invention,
  • Fig. 2 is a partially cut side view perpendicular to the view of Fig. 1 and
  • Fig. A front view (front view) of the tube according to FIGS. 1 and 2.

In Fig. 1 ist eine teilweise aufgeschnittene Seitenansicht einer Bildröhre nach der Erfindung dargestellt. Diese Bildröhre enthält eine Hülle 1, die aus einem Hals 2 und einem Konus 3 besteht und mit einem Bildfenster 4 abgeschlossen ist. Auf der Innenseite dieses Bildfensters ist ein Bildschirm 5 angeordnet. Im wesentlichen parallel zu der Aussenseite des Bildfensters 4 ist ein lichtdurchlässiges zweites Fenster 6 vorgesehen. Um das Röhrenende in Höhe der Fenster 4 und 6 und des zwischen denselben liegenden Raumes 7 ist ein Kühlmantel 8 vorgesehen. Dieser Kühlmantel enthält einen Kanal 9, der durch eine Aussenwand 10 des Kühlmantels, den Seitenrand 11 des zweiten Fensters 6, einen Glasstreifen 12 (siehe Fig. 2), den Rand des Bildfensters 4, den Rand des Konus 14 und die Rückwand 15 des Kühlmantels begrenzt wird. Etwaige Ausdehnungsunterschiede zwischen der Aussenwand 10 und dem Röhrenende können durch die biegsame Rückwand 15 des Kühlmantels ausgeglichen werden. Im Kühlmantel 8 ist eine Pumpe 16 mit einem Motor M und einem Pumpenteil P mit zwei Stutzen 17 und 18 angeordnet. Der Pumpenstutzen 18 ist über ein Rohr 19 mit einer sich erweiternden Kammer 20 verbunden, die sich an die Eintrittsöffnung 21 des Raumes 7 anschliesst. Dieser Übergang soll möglichst gleitend oder fliessend sein, um Turbulenzen und damit verbundene Brechungsindexschwankungen in der Kühlflüssigkeit im Raum 7 zu vermeiden. Die Aussenwand 10 des Kühlmantels 8 ist zickzackförmig ausgebildet, wodurch Kühlrippen gebildet werden. Die Aussenwand 10 besteht zweckmässigerweise aus Aluminium oder einem Werkstoff mit ähnlich grosser Wärmeleitfähigkeit. Als Dichtmasse 22 wird vorzugsweise Silikonkautschuk verwendet, da er eine grosse Plastizität über einen weiten Temperaturbereich besitzt. Der Raum 7, der Kanal 9 und die Pumpe 16 sind mit Kühlflüssigkeit gefüllt (beispielsweise Wasser oder ein Äthylenglykol-Wasser-Gemisch mit einem niedrigeren Schmelzpunkt und einem höheren Siedepunkt als Wasser). Die in dem Bildschirm erzeugte Wärme wird über das Bildfenster von der Kühlflüssigkeit aufgenommen. Die warme Kühlflüssigkeit wird von der Pumpe aus dem Raum 7 in den Kanal 9 gefördert. Dort gibt die Kühlflüssigkeit die darin aufgenommene Wärme teilweise an der Wand 10 und der Rückwand 15 des Kühlmantels ab und wird durch die Pumpe wieder in den Raum 7 gefördert. Die Strömungsrichtung der Kühlflüssigkeit ist durch Pfeile angegeben; selbstverständlich lässt sich die Pumprichtung auch umkehren. Die Röhre hat weiterhin einen Röhrensockel 23 mit Anschlussstiften 24.In Fig. 1 a partially cut side view of a picture tube according to the invention is shown. This picture tube contains a shell 1, which consists of a neck 2 and a cone 3 and is closed with a picture window 4. A screen 5 is arranged on the inside of this picture window. A translucent second window 6 is provided essentially parallel to the outside of the image window 4. A cooling jacket 8 is provided around the tube end at the level of the windows 4 and 6 and the space 7 lying between them. This cooling jacket contains a channel 9 through an outer wall 10 of the cooling jacket, the side edge 11 of the second window 6, a glass strip 12 (see FIG. 2), the edge of the picture window 4, the edge of the cone 14 and the rear wall 15 of the cooling jacket is limited. Any expansion differences between the outer wall 10 and the tube end can be compensated for by the flexible rear wall 15 of the cooling jacket. A pump 16 with a motor M and a pump part P with two connections 17 and 18 is arranged in the cooling jacket 8. The pump connector 18 is connected via a pipe 19 to an expanding chamber 20 which adjoins the inlet opening 21 of the room 7. This transition should be as smooth or smooth as possible in order to avoid turbulence and the associated refractive index fluctuations in the cooling liquid in space 7. The outer wall 10 of the cooling jacket 8 is zigzag-shaped, whereby cooling fins are formed. The outer wall 10 suitably consists of aluminum or a material with a similarly high thermal conductivity. Silicone rubber is preferably used as the sealing compound 22 since it has great plasticity over a wide temperature range. The space 7, the channel 9 and the pump 16 are filled with cooling liquid (for example water or an ethylene glycol / water mixture with a lower melting point and a higher boiling point than water). The heat generated in the screen is absorbed by the coolant through the image window. The warm coolant is conveyed from the room 7 into the channel 9 by the pump. There, the cooling liquid partially emits the heat absorbed therein by the wall 10 and the rear wall 15 of the cooling jacket and is pumped back into the room 7 by the pump. The direction of flow of the coolant is indicated by arrows; the pump direction can of course also be reversed. The tube also has a tube base 23 with connecting pins 24.

In Fig. 2 ist eine teilweise aufgeschnittene Seitenansicht senkrecht zur Ansicht nach Fig. 1 dargestellt. Die Bezugszeichen entsprechen denen bei Fig. 1.FIG. 2 shows a partially cut side view perpendicular to the view according to FIG. 1. The reference numerals correspond to those in FIG. 1.

In Fig. ist eine Frontansicht (Vorderansicht) der Röhre nach den Fig. 1 und 2 dargestellt. Die Bezugszeichen entsprechen wieder denen bei Fig. 1. In Fig. sind die Lage der Abdichtungen und die durch Pfeile angedeuteten Strömungsrichtungen besonders deutlich zu erkennen. Der Kühlmantel 8 ist hier kreisförmig dargestellt, er kann aber auch, wie das Bildfenster, im wesentlichen rechteckig sein.FIG. 1 shows a front view (front view) of the tube according to FIGS. 1 and 2. The reference numerals again correspond to those in FIG. 1. The position of the seals and the flow directions indicated by arrows can be seen particularly clearly in FIG. The cooling jacket 8 is shown here in a circle, but, like the picture window, it can also be essentially rectangular.

Es ist auch möglich, die Kühlflüssigkeit einzufärben, um auf diese Weise eine Filterung des vom Bildfenster 4 ausgehenden Lichtes vorzunehmen.It is also possible to color the cooling liquid in order to filter the light coming from the picture window 4 in this way.

Der Kanal 9 kann auch aus zwei Teilkanälen bestehen.The channel 9 can also consist of two sub-channels.

Da die Flüssigkeitsströmung durch eine Pumpe bewirkt wird, brauchen die Bildröhren in einer Bildwiedergabeanordnung nicht horizontal (Bildfenster vertikal) angeordnet zu werden, sie können auch mehr oder weniger vertikal (Bildfenster horizontal) angeordnet und betrieben werden.Since the liquid flow is brought about by a pump, the picture tubes in a picture display device need not be arranged horizontally (picture window vertical), they can also be arranged and operated more or less vertically (picture window horizontal).

Ein Kühlsystem für eine Projektionsfernsehbildröhre ist auch in der europäischen Patentanmeldung EP-A 0162971 beschrieben.A cooling system for a projection television picture tube is also described in European patent application EP-A 0162971.

Claims (6)

1. A projection display tube comprising an evacuated envelope (1) having a display window (4) which is provided on the inside with a display screen (5) and in front of which a light-transmitting second window (6) is provided on the outside, a cooling liquid flowing through the space (7) between the display window and the second window from at least one inlet aperture (21) to at least one outlet aperture, characterized in that a coolling jacket (8) is arranged in theregion of the window and around the said space, which cooling jacket comprises at least one channel (9) and one pump (16) having connecting pieces (17, 18) carrying the cooling liquid from the outlet aperture(s) to the inlet aperture(s) of the said space.
2. A display tube as claimed in Claim 1, characterized in that one of the pump connecting is connected to an inlet or outlet aperture or inlet or outlet apertures and the other connecting piece ends in the channel.
3. A display tube as claimed in Claim 2, characterized in that the inlet or outlet aperture or apertures merges or merge substantially smoothly into an initially widening chamber, the chamber being connected to one of the pump connecting pieces.
4. A display tube as claimed in Claim 1, 2 or 3, characterized in that the cooling jacket is essentially made of metal and may be provided with cooling ribs.
5. A display tube as claimed in any one of the preceding Claims, characterized in that the said space is bounded on two sides by two seals 12 which are arranged between the two windows and which are parallel to the direction of flow in the space.
6. A display tube as claimed in any one of the preceding Claims, characterized in that the display window is connected to the cone of the tube by means of a glassenamel substance, the frit seal thus formed being arranged in the wall of the channel.
EP84200785A 1984-06-01 1984-06-01 Projection cathode ray tube Expired EP0162972B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP84200785A EP0162972B1 (en) 1984-06-01 1984-06-01 Projection cathode ray tube
DE8484200785T DE3474484D1 (en) 1984-06-01 1984-06-01 Projection cathode ray tube
US06/738,107 US4651047A (en) 1984-06-01 1985-05-24 Projection television display tube
ES543605A ES8608732A1 (en) 1984-06-01 1985-05-29 Projection cathode ray tube.
DD85276814A DD237948A5 (en) 1984-06-01 1985-05-30 PROJEKTIONSFERNSEHBILDROEHRE
JP60115507A JPH067460B2 (en) 1984-06-01 1985-05-30 Projection-type television picture tube
KR1019850003812A KR920010664B1 (en) 1984-06-01 1985-05-31 Projection TV Display Tube With Cooling System

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84200785A EP0162972B1 (en) 1984-06-01 1984-06-01 Projection cathode ray tube

Publications (2)

Publication Number Publication Date
EP0162972A1 EP0162972A1 (en) 1985-12-04
EP0162972B1 true EP0162972B1 (en) 1988-10-05

Family

ID=8192448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84200785A Expired EP0162972B1 (en) 1984-06-01 1984-06-01 Projection cathode ray tube

Country Status (7)

Country Link
US (1) US4651047A (en)
EP (1) EP0162972B1 (en)
JP (1) JPH067460B2 (en)
KR (1) KR920010664B1 (en)
DD (1) DD237948A5 (en)
DE (1) DE3474484D1 (en)
ES (1) ES8608732A1 (en)

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Also Published As

Publication number Publication date
ES8608732A1 (en) 1986-06-16
JPH067460B2 (en) 1994-01-26
US4651047A (en) 1987-03-17
JPS60262337A (en) 1985-12-25
ES543605A0 (en) 1986-06-16
DE3474484D1 (en) 1988-11-10
KR920010664B1 (en) 1992-12-12
EP0162972A1 (en) 1985-12-04
KR860000778A (en) 1986-01-30
DD237948A5 (en) 1986-07-30

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