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

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00Apparatus 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
    • H01J9/02Manufacture of electrodes or electrode systems
    • H01J9/14Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00Apparatus 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
    • H01J9/02Manufacture of electrodes or electrode systems
    • H01J9/14Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • H01J9/144Mask 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

Similar Documents

Publication Publication Date Title
GB1224850A (en) Improvements in or relating to colour picture tubes of the shadow mask type
GB1328295A (en) Shadow mask cathode ray tubes
GB1214425A (en) Aperture mask for colour t.v. picture tubes, and method for making the same
US3809945A (en) Shadow mask for color cathode ray tube and method of manufacture thereof
GB1071879A (en) Making colour-phosphor mosaic screens
GB1165766A (en) Improvements in Cathode Ray Tubes for Colour Television
GB1313071A (en) Shadwo-mask cathode-ray tube and frame assembly and method of making same
US3929532A (en) Method for etching apertured work piece
GB1012729A (en) Colour cathode ray tubes
GB1346657A (en) Method of fabricating an apertured photo-mask
GB1432179A (en) Colour cathode ray tubes
US3639799A (en) Shadow mask with reinforcing ring for colored television picture tube
US3707640A (en) Shadow mask having double-sized apertures
JPS6313239A (en) Shadow mask
US3808071A (en) Etch-back process
GB795908A (en) Improvements in or relating to methods of manufacturing colour cathode ray tubes
GB1331814A (en) Controlling the production of plate electrodes such as shadow masks for colour television tubes
GB1331716A (en) Method of producing an apertured mask for a colour television cathode ray tube
GB1260079A (en) Colour-display cathode-ray tube
US3891491A (en) Apparatus for re-etching a color cathode ray tube shadow mask
US3753663A (en) Blank for shadow mask for color television picture tube
US3484638A (en) Shadow mask mounted in glass envelope of color tv picture tube
US3558955A (en) Self supporting shadow mask with reinforcing ribs and gusset plates for colored television picture tubes
US3730809A (en) Re-etch process for color cathode-ray tube
GB1300238A (en) Improvements relating to coloured cathode ray tubes