EP0196699B1 - Tube cathodique de projection - Google Patents

Tube cathodique de projection Download PDF

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Publication number
EP0196699B1
EP0196699B1 EP86200379A EP86200379A EP0196699B1 EP 0196699 B1 EP0196699 B1 EP 0196699B1 EP 86200379 A EP86200379 A EP 86200379A EP 86200379 A EP86200379 A EP 86200379A EP 0196699 B1 EP0196699 B1 EP 0196699B1
Authority
EP
European Patent Office
Prior art keywords
latent heat
heat accumulator
agent
window
display tube
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
EP86200379A
Other languages
German (de)
English (en)
Other versions
EP0196699A1 (fr
Inventor
Albert Dr. Comberg
Johann Dr. Schröder
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
Publication of EP0196699A1 publication Critical patent/EP0196699A1/fr
Application granted granted Critical
Publication of EP0196699B1 publication Critical patent/EP0196699B1/fr
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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/902—Heat storage

Definitions

  • the invention relates to a projection television picture tube with an evacuated envelope with a picture window, which is provided on the inside with a screen and in front of which a translucent second window is arranged on the outside, a translucent through the space between the picture window and the second window Coolant flows, which emits the heat absorbed at the picture window to the surroundings via a heat sink.
  • Such a picture tube is known from DE-OS 30 21 431.
  • a raster is described on the screen, which usually has a phosphor layer or a pattern of different phosphors. Due to the electron bombardment, the temperature of the phosphor increases, which reduces the light output of the screen ("thermal quenching").
  • This phenomenon occurs particularly in picture tubes for projection televisions, the screen being scanned by electron beams with large beam currents in order to obtain the large luminance required.
  • the temperature of the image window increases and a temperature gradient arises at the image window. This gradient causes a mechanical stress in the z. B. glass picture window. With a high electron beam current and consequently high thermal stress, this can lead to a break in the image window.
  • thermo stress In order to reduce these mechanical stresses in the image window due to temperature differences (“thermal stress”) and to avoid the reduction in light output, it is known from DE-OS 30 21 431 already mentioned to cool the image window and the screen connected to it.
  • 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.
  • cathode ray tubes up to about 40 W of beam power can be operated in continuous operation.
  • a serious disadvantage of the known picture tube is, however, that no measures are provided in the event that the tube is operated for a certain period of time above the permitted load of approximately 40 W.
  • the thermal dynamics of the known picture tube is essentially determined only by the available heat capacity of the cooling liquid, cooling element and tube body. The result is a more or less rapid rise in temperature of the coolant and thus of the picture window beyond the permitted temperature.
  • 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 by flow due to temperature differences in the cooling liquid.
  • these open systems are technically very complex because they require an external coolant circuit and a heat exchange separate from the tubes.
  • the open systems are not particularly suitable for color television projection devices in the home.
  • Another 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 invention has for its object to provide a picture tube with a more effective cooling system, so that there is effective cooling even at peak loads of more than 40 W.
  • the invention also has the task of creating a picture tube with cooling without additional tubes and separate heat exchangers.
  • a picture tube of the type described at the outset according to the invention is characterized in that the cooling liquid is also in heat-conducting contact with a latent heat store.
  • Latent heat storage uses the latent heat of chemical compounds (e.g. Glauber's salt, sodium thiosulfate or lithium fluoride), which is released when these compounds crystallize or is absorbed when they melt (Encyclopedia Natural Science and Technology, Volume 3 (Munich 1980) p . 2525).
  • chemical compounds e.g. Glauber's salt, sodium thiosulfate or lithium fluoride
  • latent heat storage means is in contact with such a system or part of a system for cooling electrical systems or system parts, the operation of which is associated with disadvantageous heat development.
  • the latent heat storage medium absorbs the heat to be removed from the system or system part and gives this heat by heat conduction and convection to the environment of the system or part of the system from (DE-AS 10 54 473, DE-PS 20 03 393, AT-PS 310 811), the heat-developing system part being separated from the latent heat storage and the heat between the separated parts by a Liquid, e.g. B. water is transmitted, which moves in a closed circuit (US-PS 40 57 101).
  • a Liquid e.g. B. water
  • the latent heat store is used to deal with any peak loads in the cooling system of cathode ray tubes.
  • the basic idea is to absorb these peak loads with the enthalpy of conversion of the latent heat storage medium at the phase transition.
  • the regeneration of the latent heat store then takes place when the cathode ray tube is operating under low load or in the switched-off state.
  • salt hydrates and hydroxide hydrates are preferred as latent heat storage agents.
  • latent heat storage agents are calcium chloride hexahydrate, sodium acetate trihydrate and sodium hydroxide monohydrate.
  • the latter latent heat storage medium has the additional advantage that it does not require a nucleating agent.
  • 1 shows the heat output P to be dissipated from the cathode ray tube as a function of the operating time t.
  • P K is the critical heat output at which the temperature of the image window exceeds the permitted value in known cooling systems.
  • safe operation is only possible in the time intervals t o to t 1 and t 2 to t 3 .
  • 2 shows how the temperature of the cooling liquid and thus also the temperature of the image window behave in a cathode ray tube cooled according to the invention.
  • T s means a sudden increase in the heat capacity of the entire cooling system.
  • the further rise in temperature is thus strongly damped, regardless of the heat transfer coefficient of the heat sink / air.
  • the capacity of the latent heat accumulator is expediently chosen to be large enough that the additional power generated by P K in the time interval t 2 to t 1 can be absorbed.
  • FIG. 3 The arrangement shown schematically in FIG. 3 of a cathode ray tube 1 and a heat sink 2 is used.
  • the tube is closed with a picture window 3, on the inside of which a screen 4 is arranged.
  • a translucent second window 5 is provided essentially parallel to the outside of the image window 3.
  • the heat sink 2 and its ribs are made of 0.5 mm thick stainless steel, but they can also consist of plastic or plastic-coated aluminum. Connections 7 made of the same material give the construction stability and serve as a thermal bridge in the latent heat storage means 6. Water serves as cooling liquid 8, the flow of which is indicated by arrows. The generation of flows of the cooling liquid has been proposed in the earlier European patent applications 84 200 784.1 and 84 200 785.8. Instead of water, other heat transport agents known in this connection can also be selected. The so-called heat pipe principle can also be used to transfer heat from the picture window to the heat sink.
  • the cathode ray tube is intended for a continuous load of 30 W. With such continuous operation, a coolant temperature of around 30 ° C (depending on the fin surface) can be expected.
  • the cooling system can absorb an overload of 113.10 3 Wsec. In other words, an overload of the tube of e.g. B. 33% of the base load can be compensated even with an overload duration of a good 3 hours.
  • the maximum window temperature of the cathode ray tube is about 60 ° C.
  • the structural arrangement corresponds to that of Example 1.
  • sodium hydroxide monohydrate is used as the latent heat storage medium, either in the form of the congruently melting composition (NaOH ⁇ H 2 O) con of 68.5% by weight NaOH and 31.5% by weight H 2 0 or in the form of the eutectic composition (NaOH ⁇ H 2 O) eut with 74.2 wt.% NaOH.
  • the technically relevant properties of these latent heat storage media are

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)

Claims (10)

1. Tube image de télévision par projection muni d'une enveloppe d'air comportant une fenêtre image dont la face intérieure est munie d'un écran image et devant laquelle est disposée sur la face extérieure, une deuxième fenêtre transparente, un liquide de refroidissement transparent circulant à travers l'espace compris entre la fenêtre image et la deuxième fenêtre et cédant la chaleur absorbée à la fenêtre image par l'intermédiaire d'un corps de refroidissement à l'ambiance, caractérisé en ce que le liquide de refroidissement est en outre en contact conducteur de chaleur avec un accumulateur de chaleur latente.
2. Tube cathodique selon la revendication 1, caractérisé en ce que l'accumulateur de chaleur latente contient un nitrate de sel comme moyen accumulateur de chaleur latente.
3. Tube cathodique selon la revendication 2, caractérisé en ce que l'accumulateur de chaleur latente contient de l'hexahydrate-chlorure de calcium comme moyen accumulateur de chaleur latente.
4. Tube cathodique selon la revendication 2, caractérisé en ce que l'accumulateur de chaleur latente contient du trihydrate-acétate de sodium comme moyen accumulateur de chaleur latente.
5. Tube cathodique selon la revendication 1, caractérisé en ce que l'accumulateur de chaleur latente contient un hydrate-hydroxyde comme moyen accumulateur de chaleur latente.
6. Tube cathodique selon la revendication 5, caractérisé en ce que l'accumulateur de chaleur latente contient du monohydrate-hydroxyde de sodium comme moyen accumulateur de chaleur latente.
7. Tube cathodique selon la revendication 6, caractérisé en ce que l'accumulateur de chaleur latente contient du monohydrate-hydroxyde de sodium sous forme de la composition sujette à fusion congruente à 64,3 °C et constituée par 68,5 % en poids de NaOH et 31,5 % en poids de H20.
8. Dispositif selon la revendication 6, caractérisé en ce que l'accumulateur de chaleur latente contient du monohydrate-hydroxyde de sodium sous forme de la composition eutectique sujette à fusion à 61,0 °C et contenant 74,2 % en poids de NaOH.
9. Tube cathodique selon la revendication 2, 3, 4 ou 5, caractérisé en ce que le moyen accumulateur de chaleur latente contient un formateur de germe.
10. Tube cathodique selon la revendication 1, 2, 5 ou 9, caractérisé en ce que le moyen accumulateur de chaleur latente (6) est noyé dans les nervures du corps de refroidissement (2).
EP86200379A 1985-03-20 1986-03-10 Tube cathodique de projection Expired EP0196699B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3510021 1985-03-20
DE19853510021 DE3510021A1 (de) 1985-03-20 1985-03-20 Projektionsfernsehbildroehre

Publications (2)

Publication Number Publication Date
EP0196699A1 EP0196699A1 (fr) 1986-10-08
EP0196699B1 true EP0196699B1 (fr) 1989-10-11

Family

ID=6265772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86200379A Expired EP0196699B1 (fr) 1985-03-20 1986-03-10 Tube cathodique de projection

Country Status (7)

Country Link
US (1) US4678961A (fr)
EP (1) EP0196699B1 (fr)
JP (1) JPH0824036B2 (fr)
KR (1) KR940001018B1 (fr)
CA (1) CA1265572A (fr)
DE (2) DE3510021A1 (fr)
ES (1) ES8703061A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2591357A1 (fr) * 1985-12-10 1987-06-12 Labo Electronique Physique Dispositif d'insolation pour la generation de masques
JPH0425802Y2 (fr) * 1987-09-17 1992-06-22
FR2637732B1 (fr) * 1988-10-07 1995-11-17 Gen Electric Cgr Perfectionnements aux dispositifs de refroidissement de tubes a rayons x
JPH1140070A (ja) * 1997-07-16 1999-02-12 Sony Corp プロジェクタ用の液冷型陰極線管
KR20030080769A (ko) * 2002-04-10 2003-10-17 삼성에스디아이 주식회사 투사형 음극선관의 냉각장치
US20040160580A1 (en) * 2002-10-01 2004-08-19 Hitachi Electronic Devices (Usa), Inc. Projection coupler with bubble trap
KR20060116365A (ko) * 2005-05-09 2006-11-15 주식회사 롯데기공 상품의 수직 적재 구조를 갖는 자동판매기

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5142913A (en) * 1974-10-11 1976-04-12 Itsuki Ban 1 konoichikenchonojudokoiruno shitsuryokunyoritsudenseigyonookonawareru handotaidendoki
JPS597731Y2 (ja) * 1979-06-07 1984-03-09 ソニー株式会社 陰極線管装置
JPS5919247Y2 (ja) * 1979-12-10 1984-06-04 三洋電機株式会社 太陽熱給湯装置
DE3042528A1 (de) * 1980-11-11 1982-06-16 Interelectric AG, 6072 Sachseln Elektrische maschine hoher belastbarkeit
US4409511A (en) * 1981-02-23 1983-10-11 Rpc Industries Phase transition cooled window for broad beam electron gun
NL191418C (nl) * 1981-03-09 1995-07-17 Mitsubishi Electric Corp Materiaal voor het opslaan van warmte; werkwijze voor het bereiden van dit materiaal.
JPS57185377A (en) * 1981-05-08 1982-11-15 Mitsubishi Electric Corp Heat-accumulating material
JPS58192240A (ja) * 1982-05-07 1983-11-09 Hitachi Ltd 投写形ブラウン管
DE3240855A1 (de) * 1982-11-05 1984-05-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Waermespeichermittel
DE3300475A1 (de) * 1983-01-08 1984-07-12 Deutsche Solvay-Werke Gmbh, 5650 Solingen Mittel zum speichern von waerme
JPS59157938A (ja) * 1983-02-24 1984-09-07 Sony Corp 陰極線管装置
EP0162972B1 (fr) * 1984-06-01 1988-10-05 Philips Patentverwaltung GmbH Tube cathodique de projection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan,unexamined applications,Section E,Vol.9,Nr.153,12.Januar 1985,THE PATENT OFFICE JAPANESE GOVERNMENT,Seite 87 E 289 *

Also Published As

Publication number Publication date
JPH0824036B2 (ja) 1996-03-06
US4678961A (en) 1987-07-07
EP0196699A1 (fr) 1986-10-08
ES8703061A1 (es) 1987-01-16
KR860007699A (ko) 1986-10-15
DE3666310D1 (en) 1989-11-16
ES553076A0 (es) 1987-01-16
CA1265572A (fr) 1990-02-06
DE3510021A1 (de) 1986-09-25
KR940001018B1 (ko) 1994-02-08
JPS61218041A (ja) 1986-09-27

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