GB1224850A - Improvements in or relating to colour picture tubes of the shadow mask type - Google Patents

Improvements in or relating to colour picture tubes of the shadow mask type

Info

Publication number
GB1224850A
GB1224850A GB57895/69A GB5789569A GB1224850A GB 1224850 A GB1224850 A GB 1224850A GB 57895/69 A GB57895/69 A GB 57895/69A GB 5789569 A GB5789569 A GB 5789569A GB 1224850 A GB1224850 A GB 1224850A
Authority
GB
United Kingdom
Prior art keywords
mils
mask
apertures
screen
shadow mask
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
GB57895/69A
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 GB1224850A publication Critical patent/GB1224850A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • H01J9/144—Mask treatment related to the process of dot deposition during manufacture of luminescent screen

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

1,224,850. Making screens. ZENITH RADIO CORP. 26 Nov., 1969 [28 March, 1969], No. 57895/69. Heading B3A. [Also in Division H1] A shadow mask for a colour television tube comprises a metal plate 10, Fig. 3, containing an array of apertures 11 opposite each of which is provided a recess 11a of similar shape. The shadow mask is used to produce a fluorescent screen by a photo-resist process, and after processing the screen the mask is etched to enlarge the apertures 11. In one example a sheet of cold rolled steel is coated on each side with a photo-resist and illuminated through a mask to provide a dot pattern on each side, and after etching in ferric chloride apertures are formed as shown in Fig. 3. The mask is used in photoresist processes to form on the screen firstly a dark area between phosphor dot areas, and then the three sets of phosphor dots, after which the screen is aluminized. The mask is then subjected to a second etch which enlarges the apertures and reduces the thickness of the mask. The initial thicknesses E1 and E2 may be 7 mils and 2¢ mils, the diameters D1 and D2 9 mils and 22 mils, the final thicknesses 5 mils and 1¢ mils, and the final aperture diameter 16 mils. The apertures need not be of uniform size, but may increase in diameter with radial distance from the centre; they may also be of elongate form (Fig. 5, not shown) so that the mask becomes a grid and the screen is of the multi-line type.
GB57895/69A 1969-03-28 1969-11-26 Improvements in or relating to colour picture tubes of the shadow mask type Expired GB1224850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81131869A 1969-03-28 1969-03-28

Publications (1)

Publication Number Publication Date
GB1224850A true GB1224850A (en) 1971-03-10

Family

ID=25206216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB57895/69A Expired GB1224850A (en) 1969-03-28 1969-11-26 Improvements in or relating to colour picture tubes of the shadow mask type

Country Status (4)

Country Link
US (1) US3666462A (en)
DE (1) DE2014090A1 (en)
GB (1) GB1224850A (en)
NL (1) NL7003142A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753663A (en) * 1969-08-15 1973-08-21 Zenith Radio Corp Blank for shadow mask for color television picture tube
JPS5713985B2 (en) * 1971-08-27 1982-03-20
US4070596A (en) * 1971-08-27 1978-01-24 Tokyo Shibaura Electric Co., Ltd. In-line plural beams cathode ray tube having color phosphor element strips spaced from each other by intervening light absorbing areas and slit-shaped aperture mask
BE793999A (en) * 1972-01-14 1973-05-02 Rca Corp METHOD OF MANUFACTURING MASK-TYPE IMAGE TUBES FOR COLOR TELEVISION
US3738233A (en) * 1972-01-17 1973-06-12 Zenith Radio Corp Camera process for color tube screen printing
JPS513733Y2 (en) * 1972-01-19 1976-02-03
JPS4882769A (en) * 1972-02-07 1973-11-05
US3923566A (en) * 1972-06-21 1975-12-02 Rca Corp Method of fabricating an apertured mask for a cathode-ray tube
NL7214003A (en) * 1972-10-17 1974-04-19
NL7404209A (en) * 1974-03-28 1975-09-30 Philips Nv PROCEDURE FOR MANUFACTURING REPRODUCTION MASKS FOR THE SHADOW MASK OF A PICTURE TUBE AND PICTURE TUBE MANUFACTURED IN ACCORDANCE WITH THIS PROCESS.
US4105493A (en) * 1975-07-05 1978-08-08 The Gillette Company Production of shaving foil
JPS59158051A (en) * 1983-02-28 1984-09-07 Toshiba Corp Manufacture of shadow mask
US4865953A (en) * 1987-09-28 1989-09-12 Rca Licensing Corp. Method for making a stencil with a borax-free, low-dichromate, casein photoresist composition

Also Published As

Publication number Publication date
DE2014090A1 (en) 1970-10-08
NL7003142A (en) 1970-09-30
US3666462A (en) 1972-05-30

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