ES8602298A1 - Cathode ray tube. - Google Patents

Cathode ray tube.

Info

Publication number
ES8602298A1
ES8602298A1 ES539027A ES539027A ES8602298A1 ES 8602298 A1 ES8602298 A1 ES 8602298A1 ES 539027 A ES539027 A ES 539027A ES 539027 A ES539027 A ES 539027A ES 8602298 A1 ES8602298 A1 ES 8602298A1
Authority
ES
Spain
Prior art keywords
refractive index
degrees
thickness
layer
halo
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
ES539027A
Other languages
Spanish (es)
Other versions
ES539027A0 (en
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
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 filed Critical Philips Gloeilampenfabrieken NV
Publication of ES8602298A1 publication Critical patent/ES8602298A1/en
Publication of ES539027A0 publication Critical patent/ES539027A0/en
Granted legal-status Critical Current

Links

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
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • 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
    • 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
    • H01J29/185—Luminescent screens measures against halo-phenomena
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8907—Image projection devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8913—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices
    • H01J2229/8916—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices inside the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8913—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices
    • H01J2229/8918—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices by using interference effects
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/893—Optical components associated with the vessel using lenses

Landscapes

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

Abstract

The halo-suppressing thin film (32) is made, of the CRT, of magnesium difluoride and has a refractive index (NM) is 1.38. The face plate (14) is made of sapphire having a refractive index (nf) of 1.8, and the luminescent screen (16) has a refractive index (np) of 2.3. The critical angle for total internal reflection from the interface is reduced to thirty-seven degrees of arc compared with fifty-two degrees for a prior arrangement. - The thickness of the intermediate layer exceeds one half wavelength of light emitted by the screen to prevent interference. A layer of thickness 0.8 micron reduces halo intensity by a factor of three whilst doubling image brightness. Alternatively, the suppression film is included as part of an eight-layer interference filter.
ES539027A 1983-12-27 1984-12-24 A CATHODIC RAY TUBE THAT HAS A FRONT PLATE ARRANGEMENT FOR HALOS SUPPRESSION Granted ES539027A0 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US56568383A 1983-12-27 1983-12-27

Publications (2)

Publication Number Publication Date
ES8602298A1 true ES8602298A1 (en) 1985-11-16
ES539027A0 ES539027A0 (en) 1985-11-16

Family

ID=24259674

Family Applications (1)

Application Number Title Priority Date Filing Date
ES539027A Granted ES539027A0 (en) 1983-12-27 1984-12-24 A CATHODIC RAY TUBE THAT HAS A FRONT PLATE ARRANGEMENT FOR HALOS SUPPRESSION

Country Status (6)

Country Link
EP (1) EP0148530B1 (en)
JP (1) JPS60157143A (en)
KR (1) KR850004342A (en)
CA (1) CA1221725A (en)
DE (1) DE3469639D1 (en)
ES (1) ES539027A0 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132919A (en) * 1977-12-12 1979-01-02 Lockheed Missiles & Space Company, Inc. Absorbing inhomogeneous film for high contrast display devices
US4263061A (en) * 1978-03-27 1981-04-21 Minnesota Mining And Manufacturing Company Process for forming a high resolution X-ray intensifying screen with antireflecting substrate

Also Published As

Publication number Publication date
DE3469639D1 (en) 1988-04-07
KR850004342A (en) 1985-07-11
EP0148530A1 (en) 1985-07-17
CA1221725A (en) 1987-05-12
EP0148530B1 (en) 1988-03-02
ES539027A0 (en) 1985-11-16
JPS60157143A (en) 1985-08-17

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