EP0209191A1 - Tube d'affichage - Google Patents

Tube d'affichage Download PDF

Info

Publication number
EP0209191A1
EP0209191A1 EP86201199A EP86201199A EP0209191A1 EP 0209191 A1 EP0209191 A1 EP 0209191A1 EP 86201199 A EP86201199 A EP 86201199A EP 86201199 A EP86201199 A EP 86201199A EP 0209191 A1 EP0209191 A1 EP 0209191A1
Authority
EP
European Patent Office
Prior art keywords
window
display
space
cooling
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.)
Granted
Application number
EP86201199A
Other languages
German (de)
English (en)
Other versions
EP0209191B1 (fr
Inventor
Cornelis Hendrikus Mathias Geujen
Johannes Cornelis Van De Ven
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 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 Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0209191A1 publication Critical patent/EP0209191A1/fr
Application granted granted Critical
Publication of EP0209191B1 publication Critical patent/EP0209191B1/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
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/24—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J7/26—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space by flow of fluid through passages associated with tube or lamp
    • 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 display tube comprising an evacuated envelope having a display window which on its inside comprises a display screen and in front of which on its outside a transparent second window is provided sub­stantially parallel to the outside and with a space between the display window and the second window which is destined for laminar flow of a transparent cooling liquid.
  • Such a display tube is disclosed in Netherlands Patent Application 8300114 laid open to plublic inspection.
  • Cooling of display tubes is of particular importance in display tubes for projection television, in which for obtaining the required great brightnesses the display screens are scanned by electron beams with high beam currents.
  • Ths use of a laminar flow of cooling liquid prevents inhomogeneities occurring in the cooling liquid and hence differences in refractive indices which are expressed as refractive patterns in the displayed picture.
  • the spacing between the display window and the second window generally is approximately 3 to 4 mm.
  • One of the objects of the invention is to achieve the said improvements at least to a considerable extent.
  • the display tube mentioned in the opening paragraph is characterized according to the invention in that a third window is provided substantially parallel to and in front of the side of the second window remote from the display window, said third window forming with the second window a second space containing the cooling liquid, the second space communicating with the first mentioned space beyond the light path of the display tube, and in that a closed cooling system is provided beyond said light path, the cooling system communicating with said first mentioned and said second spaces whereby the transparent cooling fluid in said second space flows in counter current to the liquid in the first mentioned space.
  • the cooling system and the second window can particularly simply be assembled and disassembled due to the absence of hoses, pumps and associated arrangements, while the closed cooling system proves to provide a cooling which is suffi­ciently large to use the display tube at substantially any suitable angle.
  • the light path no glass components need be used in the light path but, for example, a synthetic resin may be used for the second and the third window and metal components may be used in the cooling system.
  • the third window is a part of a system of lenses.
  • This construction promotes a rapid and accurate positioning of the display tube with respect to the system of lenses. Optimum results are obtained with optical coupling of the windows and the cooling liquid.
  • the refractive indices of the cooling liuquid and of the display window and the second and third windows are adapted to each other.
  • FIG. 1 is a diagrammatic sectional view of a display tube according to the invention.
  • the display tube comprises an evacuated envelope 1 having a substantially rectangular display window 2 which comprises a display screen 3 on its inside and in front of which on its outside a transparent second window 4 is pro­vided so as to be substantially parallel with the outside and having a space 5 between the display window 2 and the second window 4 which space is destined to laminar flow of a transparent liquid.
  • a third window 7 is provided substantially parallel to the remote side and with the second window 4forms a second space 8 to return, in counter current with respect to the heatedliquid, the cooled cooling liquid to the first space 5 between the display window 2 and the second window 4.
  • the first and second spaces 5, 8 communicate with each other beyond the light path of the display tube.
  • the flow of the cooling liquid is indicated by the arrows. If the cooling system 6 does not comprise a pump then the liquid flow is by convection.
  • the third window 7 preferably is a part of a system of lenses.
  • the spacing between the display window 2 and the second window 4 is 3 to 4 mm.
  • the spacing between the second window 4 and the third window 7 is also 3 to 4 mm.
  • the cooling system 6 may be of metal, for example, aluminium, which enables a good cooling in a simple manner.
  • the windows 4 and 7 may be of a synthetic resin, for example, polymethylmethacrylate, the refractive index of which corresponds to that of a cooling liquid consisting of a solution of glycol in water. In this manner an optical coupling between structural materials and cooling liquid is produced in a simple manner, so that annoying reflections are avoided.
  • the cooling in the display tube according to the invention is so good that the angle at which the display tube is used is of at most minor influence on the cooling.
  • the rise in temperature of the cooling liquid was at most 40°C. This rise in temperature stabilised itself after 2 hours.
  • the assembly and disassembly of the cooling system is very simple, as well as the positioning with respect to the system of lenses.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Liquid Crystal (AREA)
EP86201199A 1985-07-11 1986-07-08 Tube d'affichage Expired - Lifetime EP0209191B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8501993 1985-07-11
NL8501993A NL8501993A (nl) 1985-07-11 1985-07-11 Beeldbuis.

Publications (2)

Publication Number Publication Date
EP0209191A1 true EP0209191A1 (fr) 1987-01-21
EP0209191B1 EP0209191B1 (fr) 1990-04-25

Family

ID=19846285

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86201199A Expired - Lifetime EP0209191B1 (fr) 1985-07-11 1986-07-08 Tube d'affichage

Country Status (7)

Country Link
EP (1) EP0209191B1 (fr)
JP (1) JPS6215729A (fr)
KR (1) KR930010599B1 (fr)
CA (1) CA1274577A (fr)
DE (1) DE3670724D1 (fr)
ES (1) ES2000473A6 (fr)
NL (1) NL8501993A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3418486B2 (ja) * 1994-09-06 2003-06-23 成興工業株式会社 高さ調節式の折り畳み椅子
ES2113321B1 (es) * 1996-06-07 1999-01-16 Sony Corp Tubo de rayos catodicos del tipo de refrigeracion por liquido.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1225453A (fr) * 1982-12-22 1987-08-11 Harry Howden Dispositif pour refroidir l'ecran du tube cathodique d'un projecteur de television
NL8300114A (nl) * 1983-01-13 1984-08-01 Philips Nv Beeldbuis.
JPS59157938A (ja) * 1983-02-24 1984-09-07 Sony Corp 陰極線管装置
JPH07118260B2 (ja) * 1985-06-25 1995-12-18 ソニー株式会社 陰極線管装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 236 (E-205)[1381], 20th October 1983; & JP-A-58 126 650 (HITACHI SEISAKUSHO K.K.) 28-07-1983 *

Also Published As

Publication number Publication date
NL8501993A (nl) 1987-02-02
CA1274577A (fr) 1990-09-25
KR870001631A (ko) 1987-03-17
EP0209191B1 (fr) 1990-04-25
DE3670724D1 (de) 1990-05-31
ES2000473A6 (es) 1988-03-01
JPS6215729A (ja) 1987-01-24
KR930010599B1 (ko) 1993-10-30

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