GB1221273A - Improvements in or relating to post-deflection-focus cathode-ray tubes - Google Patents

Improvements in or relating to post-deflection-focus cathode-ray tubes

Info

Publication number
GB1221273A
GB1221273A GB46126/69A GB4612669A GB1221273A GB 1221273 A GB1221273 A GB 1221273A GB 46126/69 A GB46126/69 A GB 46126/69A GB 4612669 A GB4612669 A GB 4612669A GB 1221273 A GB1221273 A GB 1221273A
Authority
GB
United Kingdom
Prior art keywords
mask
mesh
tube
screen
insulation
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
GB46126/69A
Inventor
Ghulam A Khan
Sam H Kaplan
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.)
Zenith Electronics LLC
Original Assignee
Zenith Radio Corp
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 Zenith Radio Corp filed Critical Zenith Radio Corp
Publication of GB1221273A publication Critical patent/GB1221273A/en
Expired 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
    • H01J29/81—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching using shadow masks

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

1,221,273. Colour television tubes. ZENITH RADIO CORP. 18 Sept., 1969 [24 Oct., 1968], No. 46126/69. Heading HID. A shadow mask 31 for a colour television tube is provided with an adjacent mesh electrode 32 having interstitial dimensions small compared with the aperture dimensions of the mask, the two electrodes being separately energized to form a lens focusing the beam or beams on to the fluorescent screen. In Fig. 2 the mask 31 is coated with insulation 33 which may be aluminium oxide formed by anodizing if the mask is of aluminium or aluminium-coated steel, and the insulation is coated with a semiconductor 34 such as chrome oxide to prevent charges accumulating on it. The electrode 32 may be a woven, knitted, expanded metal or electro-formed mesh and is secured to the layer 34 by means of an adhesive. In an alternative construction, Fig. 3 (not shown), insulation such as silicon dioxide or nitride is applied to one surface of the mesh 32 which is then secured by an adhesive directly to the mask 31 without the intervening layers 33 and 34. The mask is mounted in the tube with the mesh 32 facing the electron beams and electrically connected to a wall coating on the cone of the tube; the mask itself is electrically connected to a wall coating on the face panel of the tube, possibly through the usual support means. In operation the mesh may be maintained at 25 Kv. and the mask at 24-8 Kv., the lower potential of the mask and screen ensuring that any secondary emission is directed away from the screen. The arrangement described constitutes a two-element lens for focusing the beam or beams on the screen; a three-element lens may be formed by providing another mesh electrode on the opposite side of the mask.
GB46126/69A 1968-10-24 1969-09-18 Improvements in or relating to post-deflection-focus cathode-ray tubes Expired GB1221273A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77018368A 1968-10-24 1968-10-24

Publications (1)

Publication Number Publication Date
GB1221273A true GB1221273A (en) 1971-02-03

Family

ID=25087733

Family Applications (1)

Application Number Title Priority Date Filing Date
GB46126/69A Expired GB1221273A (en) 1968-10-24 1969-09-18 Improvements in or relating to post-deflection-focus cathode-ray tubes

Country Status (2)

Country Link
US (1) US3502942A (en)
GB (1) GB1221273A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004003959A2 (en) * 2002-06-26 2004-01-08 Thomson Licensing S. A. Insulator system for a crt focus mask

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3621318A (en) * 1970-04-27 1971-11-16 Admiral Corp Color television picture tube with metallic film coating on funnel portion
US3732451A (en) * 1970-11-16 1973-05-08 Corning Glass Works Stepped supports between glass plate display screen and cathode ray tube faceplate
US3727087A (en) * 1970-11-16 1973-04-10 Corning Glass Works Means for securing planar member to cathode ray tube faceplate
US3931541A (en) * 1974-04-26 1976-01-06 Gte Sylvania Incorporated Connective means for a cathode ray tube mask-panel assembly
US3909656A (en) * 1974-05-02 1975-09-30 Zenith Radio Corp Layered, one-sided etched color selection electrode
US4059781A (en) * 1974-07-17 1977-11-22 U.S. Philips Corporation Shadow mask each aperture of which is defined by a quadrupolar lens
NL7514975A (en) * 1975-12-23 1977-06-27 Philips Nv CATHOD BEAM TUBE FOR DISPLAYING COLORED IMAGES.
NL7704130A (en) * 1977-04-15 1978-10-17 Philips Nv COLOR IMAGE TUBE.
NL7711772A (en) * 1977-10-27 1979-05-02 Philips Nv COLOR IMAGE TUBE AND METHOD FOR THE MANUFACTURE OF SUCH COLOR IMAGE TUBE.
NL7907596A (en) * 1979-10-15 1981-04-21 Philips Nv COLOR TELEVISION PICTURE TUBE.
JPS581955A (en) * 1981-06-26 1983-01-07 Toshiba Corp Mask focusing type color picture tube
US4514658A (en) * 1983-03-31 1985-04-30 Rca Corporation Mesh lens focus mask for a cathode-ray tube
US4712041A (en) * 1985-08-20 1987-12-08 Zenith Electronics Corporation Color CRT tension mask support assembly with a glass frame
US4710670A (en) * 1986-02-21 1987-12-01 Zenith Electronics Corporation Front assembly system for a tension mask color cathode ray tube
US6597093B2 (en) * 2000-12-15 2003-07-22 Thomson Licensing S. A. Cathode ray tube with a focus mask wherein a cap layer formed on the insulating material
US6677700B2 (en) * 2000-12-22 2004-01-13 Thomson Licensing S. A. Cathode-ray tube having a focus mask using partially conductive insulators

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL176924B (en) * 1952-03-18 Colgate Palmolive Co HOLDER FILLED WITH PARTICULATE DETERGENT.
US3398309A (en) * 1966-08-10 1968-08-20 Rauland Corp Post-deflection-focus cathoderay tube
US3421048A (en) * 1967-08-18 1969-01-07 Rauland Corp Color-selection mask and post-deflection focus assembly for a color tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004003959A2 (en) * 2002-06-26 2004-01-08 Thomson Licensing S. A. Insulator system for a crt focus mask
WO2004003959A3 (en) * 2002-06-26 2004-03-18 Thomson Licensing Sa Insulator system for a crt focus mask

Also Published As

Publication number Publication date
US3502942A (en) 1970-03-24

Similar Documents

Publication Publication Date Title
GB1221273A (en) Improvements in or relating to post-deflection-focus cathode-ray tubes
US2177360A (en) Optical image intensifier
US2484721A (en) Electrode gun such as is used in cathode-ray tubes
US3201630A (en) Charge storage sheet with tapered apertures
US2293417A (en) Electron beam tube
US3974411A (en) Channel plate electron multiplier tube having reduced astigmatism
GB1154515A (en) Improvements in or relating to Image Intensifiers
US3708673A (en) Image intensifier tube
US2951179A (en) Electron shield for post acceleration cathode ray tube
US4286148A (en) Image intensifier tube with photocathode protective circuit
US3304455A (en) Image-converter tube with output fluorescent screen assembly resiliently mounted
US3989971A (en) Gateable electron image intensifier
US4293790A (en) Image converter having cylindrical housing and photocathode separated by spacing element from luminescent screen on frustrum
US3760214A (en) Shadow masks for use in colour picture tubes
US2248977A (en) Electro-optical device
US3154710A (en) Cathode-ray display system having electrostatic magnifying lens
US3771004A (en) Reflective multiplier phototube
US2946910A (en) Infrared image converter tubes
US3567947A (en) Imaging screen assembly for image intensifier tube
US2173257A (en) Cathode ray tube
US3350594A (en) Image intensifier having continuous conducting layer between porous metallic coating and luminescent layer
GB1417452A (en) Image tube employing high field electron emission suppression
US4126813A (en) Direct view device
US2498082A (en) Gun structure for cathode-ray tubes
US3340421A (en) Cathode ray tube having metallic layer of non-uniform thickness