US3783754A - Method and apparatus for manufacturing color picture tubes - Google Patents

Method and apparatus for manufacturing color picture tubes Download PDF

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Publication number
US3783754A
US3783754A US00231312A US3783754DA US3783754A US 3783754 A US3783754 A US 3783754A US 00231312 A US00231312 A US 00231312A US 3783754D A US3783754D A US 3783754DA US 3783754 A US3783754 A US 3783754A
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United States
Prior art keywords
light
correction lens
panel
source
drive means
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Expired - Lifetime
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US00231312A
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English (en)
Inventor
K Maruyama
T Ueda
T Takemoto
E Yamazaki
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Hitachi Ltd
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Hitachi Ltd
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    • 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

Definitions

  • SHEET 30F 3 METHOD AND APPARATUS FOR MANUFACTURING COLOUR PICTURE TUBES BACKGROUND OF THE INVENTION
  • This invention relates to a method and apparatus for manufacturing colour picture tube and more particularly to a method and apparatus for manufacturing fluorescent screens thereof.
  • the fluorescent screen of a colour picture tube is manufactured by applying in a regular pattern a plurality of trios and phosphor dots of three colours on the inner surface of the face plate or the panel of the tube by photographic technique.
  • a correction lens having an extremely complicated curved surface is used for the purpose of causing the locus of the exposure light emanated from a source of light to approximate the locus of the electron beam prevailing in the completed tube.
  • FIG. 1 of the accompanying drawing shows a plane view of such a correction lens
  • FIG. 2 the cross-section thereof
  • FIG. 3 a panel 4 having a fluorescent screen formed with the correction lens shown in FIGS. 1 and 2 and viewed from the exterior of the tube.
  • the upper or effective surface of the correction lens is divided into a plurality of small rectangular regions 2 partitioned by grid shaped boundary lines 3.
  • the surface of each region is a flat or slightly curved surface inclined to the bottom surface of the lens 1 so that the upper or effective surface of the lens is a discontinuous surface and the boundary lines 3 or the portions interconnecting adjacent rectangular regions form steep vertical side surfaces. Since the flat or slightly curved surfaces and the vertical side surfaces manifest different transmission characteristics to the light transmitting through the correction lens, the fluorescent screen formed on the panel 4 with this correction lens has portions 5 corresponding to flat regions 2 and grid shaped portions 6 corresponding to boundary lines 3, as shown in FIG. 3, portions 5 and 6 having been exposed to light of different intensities. Such grid shapedpattem caused by nonuniform exposure is seen from outside of the tube whether it is operating .or not, thus degrading thequality of the reproduced picture.
  • a method of manufacturing a colour picture tube wherein the phosphor coated on the inner surface of the panel of the tube is exposed to the light emanated from a source of light and transmitting through a correction lens having a discontinuous surface, characterized in that the phosphor is exposed to the light while continuously changing the relative positions of the panel, the source of light and the correction lens thereby uniformly exposing the phosphor.
  • apparatus for manufacturing a colour picture tube comprising a source of light and a correction lens having discontinuous surfaces and disposed between the panel of the tube and the source of light whereby the phosphor coated on the inner surface of the panel is exposed to the light from the source and transmitting through the correction lens to form a fluorescent screen, characterized in that there is provided means for continuously changing the relative positions of the panel, the correction lens and the source of light while the phosphor is exposed, thereby assuring uniform exposure.
  • such means may be associated with any one of the panel, the source of light and the correction lens.
  • said means may comprise a first and a second drive means which are operated simultaneously to continuously move the correction lens along a diagonal of one rectangular region.
  • FIG. 1 shows a plane view of a correction lens having a discontinuous surface and utilized to carry out the invention
  • FIG. 2 is a sectional view of the correction lens shown in FIG. ll, taken along a line II ll;
  • FIG. 3 is a diagrammatic representation of a'panel of a colour picture tube having a fluorescent screen formed by using the correction lens shown in FIGS. 1 and 2;
  • FIG. 4 shows a diagrammatic longitudinal section of the exposure device utilized to carry out the invention
  • FIG. 5 is a diagram to explain the method of manufacturing a fluorescent screen in accordance with this invention.
  • I FIG. 6 is a plan view showing the detail of the means for shifting the correction lens, light source or panel.
  • FIG. 4 one example of an exposure device utilized to form the fluorescent screen of a colour picture tube in accordance with the method of this invention is shown in FIG. 4.
  • the exposure device 11 shown therein comprises a source of light 12, a correction lens 13 which is identical to that shown in FIGS. 1 and 2 and is used for the purpose of causing the locus of the light emanatedfrom the source of light 12 to approximate the locus of electron beam prevailing in the completed colour picture tube, and means 14 for shifting the position of the correction lens 13.
  • the panel 16 provided with the shadow mask 15 of the colour picture tube is mounted on the upper end of the exposure device 11.
  • the phosphor applied onto the inner surface of the panel 16 is exposed to the light emanated from source 12 and transmitting through the correction lens 13 while it is being continuously moved by the shifting means 14. More particularly, the correction lens 13 is continuously moved along a diagonal 19 or 20 passing through the center 20 of a square 17 representing one region 2 of the correction lens 13.
  • the cross strips 6 caused by the grid shaped boundary lines 6 will be evenly distributed over the entire surface of the phosphor thereby assuring uniform exposure of the entire area of the fluorescent screen.
  • means 14 for shifting the correction lens 13 (or light source 12 or panel 16 comprises drive means 21 for driving the correction lens 13 in the direction of Y, a base plate 22 on which is secured the driving means 21 and a drive means 23 for driving the base plate 22 in the direction of X.
  • correction lens 13 when drive means 21 is operated correction lens 13 is moved in the direction of Y whereas when drive means 23 is operated correction lens 13 is moved in the direction of X together with drive means 21. Accordingly, when drive means 21 and 23 are operated simultaneously at a speed ratio corresponding to the ratio of the longitudinal to the transversal dimension of one region of the correction lens 13, the correction lens will be moved along a diagonal 19 or 20.
  • the direction of movement of the correction lens is not limited to this particular direction but the correction lens may be moved in any direction that can assure uniform exposure of the fluorescent screen or can eliminate uneven exposure due to the boundary lines between the divided regions.
  • the same object can also be accomplished by changing the relative positions of the panel of the colour picture tube, the correction lens and the source of light.
  • the shifting mans 14 shown in FIG. 6 may be provided for either the source of light 12 or the panel 16.
  • the invention can also be applied to a colour picture tube having a fluorescent screen in which phosphors of three colours are applied in the form of parallel stripes.
  • a colour picture tube having a uniformly exposed fluorescent screen thereby improving the quality of the reproduced picture.
  • a method of manufacturing a colour picture tube wherein the phosphor coated on the inner surface of the panel of said tube is exposed to the light emanated from a source of light and transmitting through a correction lens having a plurality of discontinuous elemental lens surfaces contiguously joined bylight diffusing boundaries which define the perimeters of said surfaces
  • the improvement which comprises the step of exposing said phosphor while continuously changing the relative positions of said panel, said source of light and said correction lens by moving along a transverse dimension of the elemental area of said lens surfaces and moving an amount to extend over the elemental area of said lens surfaces which distributes the image of said boundaries on said inner surface for substantially uniformly exposing said phosphor.
  • a colour picture tube comprising a source of light, and a correction lens having a plurality of discontinuous elemental lens surfaces contiguously joined by light diffusing boundaries which define the perimeters of said surfaces and disposed between the panel of said tube and said source of light whereby the phosphor coated on the inner surface of said panel is exposed to the light from said source and transmitted through said correction lens to form a fluorescent screen
  • the improvement which comprises means continuously changing the relative positions of said panel, said correction lens and said source of light by an amount and direction which distributes the image of said boundaries on said inner surface while said phosphor is exposed for assuring substantially uniform exposure.
  • said continuously changing means comprises a drive means for moving said correction lens.
  • said drive means for moving said correction lens comprises a first drive means for moving said correction lens in a first direction, a base plate supporting said first drive means, and a second means for driving said base plate in a second direction.
  • said continuously changing means comprises a drive means for moving said panel.
  • said drive means for moving said panel comprises a first drive means for moving said panel in a first direction, a base plate supporting said first drive means, and a second means for driving said base plate in a second direction.
  • correction lens has surfaces divided into a plurality of discontinuous rectangular regions and said first and second drive means are operated simultaneously for moving said correction lens along a diagonal of one rectangular region.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
US00231312A 1971-03-05 1972-03-02 Method and apparatus for manufacturing color picture tubes Expired - Lifetime US3783754A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1127571A JPS5332230B1 (enrdf_load_stackoverflow) 1971-03-05 1971-03-05

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US3783754A true US3783754A (en) 1974-01-08

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US00231312A Expired - Lifetime US3783754A (en) 1971-03-05 1972-03-02 Method and apparatus for manufacturing color picture tubes

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US (1) US3783754A (enrdf_load_stackoverflow)
JP (1) JPS5332230B1 (enrdf_load_stackoverflow)
FR (1) FR2128606B1 (enrdf_load_stackoverflow)
GB (1) GB1347949A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876425A (en) * 1972-09-06 1975-04-08 Philips Corp Method of and device for the manufacture of a cathode-ray tube for displaying coloured pictures, as well as cathode-ray tube manufactured by said method
US3883880A (en) * 1972-12-25 1975-05-13 Hitachi Ltd Exposure apparatus for manufacturing fluorescent screens of colour picture tubes
US4001018A (en) * 1973-06-13 1977-01-04 Tokyo Shibaura Electric Co., Ltd. Method for making a stripe screen on a face plate of a cathode ray tube by rotating correction lens
US4013467A (en) * 1971-06-18 1977-03-22 Matsushita Electronics Corporation Method of manufacturing color picture tubes using rotating light attenuator
US4078239A (en) * 1976-07-02 1978-03-07 Zenith Radio Corporation Method and apparatus for screening slot-mask, stripe screen color cathode ray tubes
US4152154A (en) * 1970-06-05 1979-05-01 U.S. Philips Corporation Method of optically projecting a pattern of substantially circular apertures on a photosensitive layer by rotating light source
US4521501A (en) * 1983-07-14 1985-06-04 Rca Corporation Method for reducing degradation of an optical image in an exposure lighthouse
US4707093A (en) * 1985-06-04 1987-11-17 Videocolor Method and device for illuminating the face plate of a color television tube for formation of the screen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8712458D0 (en) * 1987-05-27 1987-07-01 Philips Nv Producing colour picture tube screen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211067A (en) * 1962-06-15 1965-10-12 Rauland Corp Method of exposing a multi-color target structure
US3559546A (en) * 1967-11-01 1971-02-02 Sylvania Electric Prod Cathode ray tube screen exposure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211067A (en) * 1962-06-15 1965-10-12 Rauland Corp Method of exposing a multi-color target structure
US3559546A (en) * 1967-11-01 1971-02-02 Sylvania Electric Prod Cathode ray tube screen exposure

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152154A (en) * 1970-06-05 1979-05-01 U.S. Philips Corporation Method of optically projecting a pattern of substantially circular apertures on a photosensitive layer by rotating light source
US4013467A (en) * 1971-06-18 1977-03-22 Matsushita Electronics Corporation Method of manufacturing color picture tubes using rotating light attenuator
US3876425A (en) * 1972-09-06 1975-04-08 Philips Corp Method of and device for the manufacture of a cathode-ray tube for displaying coloured pictures, as well as cathode-ray tube manufactured by said method
US3883880A (en) * 1972-12-25 1975-05-13 Hitachi Ltd Exposure apparatus for manufacturing fluorescent screens of colour picture tubes
US4001018A (en) * 1973-06-13 1977-01-04 Tokyo Shibaura Electric Co., Ltd. Method for making a stripe screen on a face plate of a cathode ray tube by rotating correction lens
US4078239A (en) * 1976-07-02 1978-03-07 Zenith Radio Corporation Method and apparatus for screening slot-mask, stripe screen color cathode ray tubes
US4521501A (en) * 1983-07-14 1985-06-04 Rca Corporation Method for reducing degradation of an optical image in an exposure lighthouse
US4707093A (en) * 1985-06-04 1987-11-17 Videocolor Method and device for illuminating the face plate of a color television tube for formation of the screen

Also Published As

Publication number Publication date
GB1347949A (en) 1974-02-27
DE2210726B2 (de) 1976-07-29
DE2210726A1 (de) 1972-09-14
FR2128606A1 (enrdf_load_stackoverflow) 1972-10-20
JPS5332230B1 (enrdf_load_stackoverflow) 1978-09-07
FR2128606B1 (enrdf_load_stackoverflow) 1975-10-24

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