GB775204A - Improvements in or relating to colour television picture display tubes - Google Patents

Improvements in or relating to colour television picture display tubes

Info

Publication number
GB775204A
GB775204A GB33957/54A GB3395754A GB775204A GB 775204 A GB775204 A GB 775204A GB 33957/54 A GB33957/54 A GB 33957/54A GB 3395754 A GB3395754 A GB 3395754A GB 775204 A GB775204 A GB 775204A
Authority
GB
United Kingdom
Prior art keywords
mask
screen
colour
springs
sealed
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
GB33957/54A
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.)
CBS Broadcasting Inc
Original Assignee
Columbia Broadcasting System Inc
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 Columbia Broadcasting System Inc filed Critical Columbia Broadcasting System Inc
Publication of GB775204A publication Critical patent/GB775204A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06Screens for shielding; Masks interposed in the electron stream
    • H01J29/07Shadow masks for colour television tubes
    • H01J29/073Mounting arrangements associated with shadow masks
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00Details of cathode ray tubes or electron beam tubes
    • H01J2229/07Shadow masks
    • H01J2229/0727Aperture plate
    • H01J2229/0766Details of skirt or border
    • H01J2229/0772Apertures, cut-outs, depressions, or the like

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

775,204. Colour television tubes. COLUMBIA BROADCASTING SYSTEM, Inc. Nov. 23, 1954 [Dec. 21, 1953], No. 33957/54. Class 39(1). A colour display tube has a shadow mask or colour switching grid adjacent the phosphor screen, the screen and the mask both being curved and being provided with co-operating locating means such as springs with V feet on the mask and projections on the screen, held in engagement by resilient means preferably springs. Since the mask is curved thermal expansion and contraction of the mask does not alter substantially either the registration or the spacing of the mask and screen. In one form, Figs. 1, 4 the shadow mask 13 is located with reference to the tube and wall 12 carrying the tri-colour phosphor dots by three hemispherical glass projections 14 which may be moulded integrally with 12 or cylinders with rounded ends sealed into holes in the surface of 12. The rim 15 of mask 13 has three apertures 16 which receive three springs 17 with V-shaped feet which engage the three projections 14. The mask is also biased by three springs 19 which may or may not be similar to 17 and co-operating with metal spacer protrusions 20. The six springs 17, 19 of laminated steel strips bear against the inner edge of rim 21. The mask and tube end wall 12 are spherically shaped. The protrusions 20 can be replaced by glass pads integral with or attached to the screen 12. The screen 12 and mask 13 can be rectangular instead of circular, Figs. 2, 2A (not shown). In a further embodiment, Fig. 5, a rod 62 is sealed in projection 54 and extends through the vee 61 and carries spring 64 maintained in tension by crosspiece 66 and washers 63, 65. In further modifications, not illustrated (a) the vees may be formed by embossing the mask, (b) the phosphors may be in lines, (c) the masks can be of the shadow or colour switching type and formed as grids or sheets with rectangular apertures. The tube is sealed by welding metal flanges 21, 22 together. U.S.A. Specification 2,690,518 is referred to. A prior art colour receiver is referred to wherein in assembly a shadow mask is laid on a frame member, three slots in the mask resting on three eccentric pins on the frame, a second frame member is placed over the mask, screws are put in but not tightened, the mask is "hot blocked" and the screws tightened so that on cooling the mask is kept flat. The three eccentric fins on the frame have rounded ends which fit in grooves in the phosphor dot plate. The mask assembly is now fastened to three studs 120 degrees apart and carried on an envelope flange, and the decorative mask is snapped in place. The viewing end of the bulb having a similar flange is placed over the decorative mask and the two flanges are sealed together.
GB33957/54A 1953-12-21 1954-11-23 Improvements in or relating to colour television picture display tubes Expired GB775204A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US775204XA 1953-12-21 1953-12-21

Publications (1)

Publication Number Publication Date
GB775204A true GB775204A (en) 1957-05-22

Family

ID=22138551

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33957/54A Expired GB775204A (en) 1953-12-21 1954-11-23 Improvements in or relating to colour television picture display tubes

Country Status (3)

Country Link
FR (1) FR1117716A (en)
GB (1) GB775204A (en)
NL (1) NL193148A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190538A (en) * 1986-05-14 1987-11-18 Sony Corp Colour cathode-ray tubes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55163745A (en) * 1979-06-07 1980-12-20 Sony Corp Flat panel type color cathode-ray tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190538A (en) * 1986-05-14 1987-11-18 Sony Corp Colour cathode-ray tubes
US4798992A (en) * 1986-05-14 1989-01-17 Sony Corporation Color cathode-ray tube with electron beam selection mask support structure
GB2190538B (en) * 1986-05-14 1990-07-25 Sony Corp Colour cathode-ray tubes

Also Published As

Publication number Publication date
NL193148A (en)
FR1117716A (en) 1956-05-25

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