DE875971C - Fluorescent screen for high-performance cathode ray tubes - Google Patents

Fluorescent screen for high-performance cathode ray tubes

Info

Publication number
DE875971C
DE875971C DEF6723A DEF0006723A DE875971C DE 875971 C DE875971 C DE 875971C DE F6723 A DEF6723 A DE F6723A DE F0006723 A DEF0006723 A DE F0006723A DE 875971 C DE875971 C DE 875971C
Authority
DE
Germany
Prior art keywords
cathode ray
ray tubes
fluorescent screen
performance cathode
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.)
Expired
Application number
DEF6723A
Other languages
German (de)
Inventor
Friedrich Dr Michels
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh 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 Fernseh GmbH filed Critical Fernseh GmbH
Priority to DEF6723A priority Critical patent/DE875971C/en
Application granted granted Critical
Publication of DE875971C publication Critical patent/DE875971C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/63—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing boron
    • 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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/20—Luminescent screens characterised by the luminescent material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Luminescent Compositions (AREA)

Description

Leuchtschirm für Hochleistungs-Kathodenstrahlröhren Die bisher verwendeten Leuchtstoffe für Projektionsbildröhren, insbesondere solche zur Großprojektion, besitzen eine sehr geringe Lebensdauer. Durch Ionenaufprall erfolgt nach kurzer Betriebsdauer eine Verfärbung und Verdunkelung des Leuchtstoffes. Ein weiterer Nachteil der bisher verwendeten Leuchtstoffe besteht darin, daß sie bei höherer Schirmbelastung und Erwärmung sehr stark an Helligkeit einbüßen; z. B. sinkt das Leuchten von (Zn S, Cd S) Ag bei Temperaturen von z5o° auf einen geringen Bruchteil des Leuchtens bei Zimmertemperatur ab.Fluorescent screen for high-performance cathode ray tubes The previously used Luminescent substances for projection picture tubes, in particular those for large-scale projection, have a very short lifespan. Ion impact occurs after a short time Operating time a discoloration and darkening of the fluorescent material. Another disadvantage of the phosphors used so far is that they are exposed to higher screen loads and warming lose a lot of brightness; z. B. decreases the glow of (Zn S, Cd S) Ag at temperatures of 50 ° to a small fraction of the luminosity at room temperature.

Erfindungsgemäß wird vorgeschlagen, als Leuchtstoffe für Projektionsröhren Bornitridleuchtstoffe zu verwenden. Bornitridleuchtstoffe sind an sich aus der Literatur bekannt. Sie werden vorzugsweise mit Kohlenstoff aktiviert, wobei bei geringem Kohlenstoffgehalt ein blauleuchtender und bei höherem Kohlenstoffgehalt ein gelbleuchtender Luminophor erhalten wird. Diese Leuchtstoffe besaßen bisher nur wissenschaftliches Interesse, da ihre Helligkeit bei Elektronenbeschuß unter normalen Bedingungen und niedrigen Spannungen nur etwa ein Viertel der von Sulfidleuchtstoffen beträgt. Leuchtstoffe auf der Bornitritgrundlage besitzen aber eine außerordentlich hohe Widerstandsfähigkeit, sie zeigen noch bei Rotglut Lumineszenz, sind gegen Ionenbeschuß weitgehend unempfindlich und zersetzen sich erst bei Temperaturen von etwa 25oo°. Man kann daher die Belastung solcher Leuchtschirme bis zur Grenze der Erweichung der Leuchtschirmunterlagt treiben und auf diese Weise Leuchtdichten erzielen, die weit über denen der Sulfidleuchtstoffe liegen.According to the invention it is proposed as phosphors for projection tubes To use boron nitride phosphors. Boron nitride phosphors are per se from the literature known. They are preferably activated with carbon, with a low carbon content a blue luminophore and a yellow luminophore with a higher carbon content is obtained. So far, these phosphors have only been of scientific interest, since their brightness at electron bombardment under normal and low conditions Voltage is only about a quarter of that of sulphide phosphors. Phosphors but based on boron nitride have an extremely high resistance, they still show luminescence when it is glowing red and are largely insensitive to ion bombardment and only decompose at temperatures of around 25oo °. One can therefore take the burden such luminescent screens drive to the limit of the softening of the luminescent screen underlay and in this way luminances achieve that far above that the sulphide phosphors lie.

Zur Erhöhung der Belastung wird zweckmäßig die ,Anodenspannung gesteigert. Dabei können störende Aufladungen in an sich bekannter Weise durch Bedecken des Leuchtschirms mit einer Aluminiumfolie vermieden werden.To increase the load, the anode voltage is expediently increased. This can cause disruptive charges in a manner known per se by covering the Luminescent screen with an aluminum foil can be avoided.

Claims (2)

PATENTANSPRÜCHE: z. Leuchtschirm für Hochleistungs-Kathodenstrahlröhren, insbesondere für Großprojektion, dadurch gekennzeichnet, daß der Leuchtstoff des Schirms aus Bornitrid besteht. PATENT CLAIMS: e.g. Fluorescent screen for high-performance cathode ray tubes, in particular for large-scale projection, characterized in that the phosphor des Screen is made of boron nitride. 2. Leuchtschirm nach Anspruch z, dadurch gekennzeichnet, daß der Leuchtstoff aus zwei Komponenten besteht, die blaues bzw. gelbes Eigenleuchten haben, mit Kohlenstoff geringer bzw. höherer Konzentration. aktiviert und in solchem Verhältnis gemischt sind, daß die resultierende Farbe bei Elektronenbeschuß mit einer der Betriebsspannung annähernd entsprechenden Geschwindigkeit Weiß ergibt.2. luminescent screen according to claim z, characterized in that that the phosphor consists of two components, the blue and yellow self-luminosity have, with carbon lower or higher concentration. activated and in such Ratio are mixed that the resulting color when electron bombarded with a speed approximately corresponding to the operating voltage results in white.
DEF6723A 1951-07-13 1951-07-13 Fluorescent screen for high-performance cathode ray tubes Expired DE875971C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF6723A DE875971C (en) 1951-07-13 1951-07-13 Fluorescent screen for high-performance cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF6723A DE875971C (en) 1951-07-13 1951-07-13 Fluorescent screen for high-performance cathode ray tubes

Publications (1)

Publication Number Publication Date
DE875971C true DE875971C (en) 1953-05-07

Family

ID=7085112

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF6723A Expired DE875971C (en) 1951-07-13 1951-07-13 Fluorescent screen for high-performance cathode ray tubes

Country Status (1)

Country Link
DE (1) DE875971C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026883B (en) * 1953-12-28 1958-03-27 Gen Electric Luminescent screen for cathode ray excitation and method of manufacturing such a screen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026883B (en) * 1953-12-28 1958-03-27 Gen Electric Luminescent screen for cathode ray excitation and method of manufacturing such a screen

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