GB1245325A - Exposure device for manufacturing colour display cathode-ray tubes - Google Patents

Exposure device for manufacturing colour display cathode-ray tubes

Info

Publication number
GB1245325A
GB1245325A GB58511/69A GB5851169A GB1245325A GB 1245325 A GB1245325 A GB 1245325A GB 58511/69 A GB58511/69 A GB 58511/69A GB 5851169 A GB5851169 A GB 5851169A GB 1245325 A GB1245325 A GB 1245325A
Authority
GB
United Kingdom
Prior art keywords
lens
mask
diameter
distance
light source
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
GB58511/69A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1245325A publication Critical patent/GB1245325A/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
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes
    • H01J9/2272—Devices for carrying out the processes, e.g. light houses

Abstract

1,245,325. Colour television tubes. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 1 Dec., 1969 [4 Dec., 1968], No. 58511/69. Heading H1D. In manufacture of a colour television luminescent screen of the multi-dot type by exposure of a photo-resist through a shadow mask, a rotationally-symmetrical divergent lens 11 is disposed between the light source C1, Fig. 2, and the mask to increase the relative intensity of the light transmitted to the edges of the mask. The light intensity I# at the angle # between the axis and a line joining C1 to the edge of the screen should satisfy the condition I # < (cos #/cosα) I α , when I α is the intensity at the angle α given by sin α = (1 + v/f)<SP>-1</SP> sin #, where v is the distance from C1 to the lens, f is the focal length of the lens, and f < 3v. The diameter of the light source may be larger than usual and may be at least equal to 0À7LB/Q, where B is the diameter of an aperture in the centre of the mask, L is the distance ClC2 and Q is the distance between the central part of the mask and C2. The radii of curvature of the surfaces of the lens 11 should satisfy the condition R1 = v/(1 + n) and R2 = (1 + 1/n)R1 + t, where n is the refractive index and t the thickness of the central part of the lens. The apparatus shown includes a correction lens 12 which makes the directions of the light rays conform to the directions of the deflected electron beam in the finished tube, and one side of the lens has a filter layer 12a whose permeability increases from its centre towards its edge. The light source comprises a cone 10 illuminated by an electric discharge lamp, and the tip of the cone may have a diameter of 6 mm.
GB58511/69A 1968-12-04 1969-12-01 Exposure device for manufacturing colour display cathode-ray tubes Expired GB1245325A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6817330A NL6817330A (en) 1968-12-04 1968-12-04

Publications (1)

Publication Number Publication Date
GB1245325A true GB1245325A (en) 1971-09-08

Family

ID=19805325

Family Applications (1)

Application Number Title Priority Date Filing Date
GB58511/69A Expired GB1245325A (en) 1968-12-04 1969-12-01 Exposure device for manufacturing colour display cathode-ray tubes

Country Status (10)

Country Link
US (1) US3628429A (en)
JP (1) JPS4944307B1 (en)
BE (1) BE742548A (en)
BR (1) BR6914676D0 (en)
DE (1) DE1958521A1 (en)
ES (1) ES374156A1 (en)
FR (1) FR2025237A1 (en)
GB (1) GB1245325A (en)
NL (1) NL6817330A (en)
SE (1) SE344847B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249661A (en) * 1990-09-22 1992-05-13 Samsung Electronic Devices Colour cathode ray tube screen exposure apparatus.

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078239A (en) * 1976-07-02 1978-03-07 Zenith Radio Corporation Method and apparatus for screening slot-mask, stripe screen color cathode ray tubes
JPS58134779A (en) * 1982-02-04 1983-08-11 Toshiba Corp Thermal printer
US4568162A (en) * 1983-08-19 1986-02-04 Rca Corporation Method for screening line screen slit mask color picture tubes
US4516841A (en) * 1983-08-19 1985-05-14 Rca Corporation Method for screening line screen slit mask color picture tubes
JPS63254078A (en) * 1987-04-13 1988-10-20 Fujitsu Ltd Platen mechanism of wire dot printer
US5946519A (en) * 1997-08-18 1999-08-31 Chunghwa Picture Tubes, Ltd. Light source for forming phosphor elements on CRT display screen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936682A (en) * 1956-07-02 1960-05-17 Sylvania Electric Prod Device for use in processing discrete screen patterns for cathode ray tubes
US2942099A (en) * 1958-04-11 1960-06-21 Rca Corp Optical projection system
US3420150A (en) * 1965-05-10 1969-01-07 Rauland Corp Lighthouse intensity exposure control lens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249661A (en) * 1990-09-22 1992-05-13 Samsung Electronic Devices Colour cathode ray tube screen exposure apparatus.
GB2249661B (en) * 1990-09-22 1994-11-23 Samsung Electronic Devices Colour cathode ray tube screen exposure apparatus

Also Published As

Publication number Publication date
SE344847B (en) 1972-05-02
BR6914676D0 (en) 1973-04-19
ES374156A1 (en) 1971-12-16
BE742548A (en) 1970-06-02
JPS4944307B1 (en) 1974-11-27
DE1958521A1 (en) 1970-06-18
US3628429A (en) 1971-12-21
NL6817330A (en) 1970-06-08
FR2025237A1 (en) 1970-09-04

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