US3788200A - Exposure device for manufacturing colour picture tubes - Google Patents

Exposure device for manufacturing colour picture tubes Download PDF

Info

Publication number
US3788200A
US3788200A US00231313A US3788200DA US3788200A US 3788200 A US3788200 A US 3788200A US 00231313 A US00231313 A US 00231313A US 3788200D A US3788200D A US 3788200DA US 3788200 A US3788200 A US 3788200A
Authority
US
United States
Prior art keywords
exposure device
correction lens
light
boundary lines
regions
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 - Lifetime
Application number
US00231313A
Other languages
English (en)
Inventor
E Yamazaki
K Maruyama
T Ueda
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Application granted granted Critical
Publication of US3788200A publication Critical patent/US3788200A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • ABSTRACT In an exposure device for manufacturing a colour picture tube of the type comprising a source of light, and a correction lens having an effective surface divided into a plurality of discontinuous regions surrounded by boundary lines and disposed between the panel of the tube and the source of light whereby the photosensitive film coated on the inner surface of the panel is exposed to the light emanating from the source and transmitted through the correction lens to form a fluorescent screen, there is provided means for the correction lens for restricting the light transmitted through the discontinuous regions thereby uniformly exposing the photosensitive film.
  • SHEET 3 0F 3 EXPOSURE DEVICE FOR MANUFACTURING COLOUR PICTURE TUBES BACKGROUND OF THE INVENTION This invention relates to an exposure device utilized to form a fluorescent screen of a colour picture tube and more particularly to an improved correction lens system.
  • the fluorescent screen of a colour picture tube is manufactured by applying in a regular pattern a plurality of trios of phosphor dots of three colours on the inner surface of the face plate or 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 emanating from a source of light to approximate the locus of the electron beam prevailing in the completed tube.
  • FIG. 1 of the accompanying drawings shows a plan view of such a correction lens
  • FIG. 2 the cross-section thereof
  • FIG. 3 the panel 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 3 partitioned by grid shaped boundary lines 2.
  • 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 2 or the portions interconnecting adjacent 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, (boundary lines have smaller transmissibility than the rectangular regions) the fluorescent screen formed on the panel 4 with this correction lens has portions 5 corresponding to flat regions 3 and grid shaped portions 6 corresponding to boundary lines 2, portions 5 and 6 having been exposed to light of different intensities. Such grid shaped pattern caused by non-uniform exposure is seen from outside of the tube whether it is operating or not, thus degrading the quality of the re- 7 produced picture.
  • an exposure device for manufacturing a colour picture tube of the type comprising a source of light and a correction lens having an effective surface divided into a plurality of discontinuous regions surrounded by boundary lines and disposed between the panel of the tube and the source of light whereby the photosensitive film coated on the inner surface of the panel is exposed to the light emanating from the source and transmitted through the correction lens to form the dot pattern of a fluorescent screen, characterized in that means is associated with the correction lens for restricting the light transmitted through the discontinuous regions thereby uniformly exposing the photosensitive film.
  • the means for restricting the light may be comprised by a check pattern of opaque substance applied on the discontinuous regions of the correction lens or on the surface of a transparent substrate combined with the correction lens.
  • FIG. 1 shows a plan view of a prior art correction lens utilized in the exposure device
  • FIG. 2 shows a cross-sectional view of the correction lens shown in FIG. 1 taken along a line II II;
  • FIG. 3 shows a front view of the 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 longitudinal sectional view of one example of the exposure device embodying the invention
  • FIG. 5 is a plan view of a correction lens utilized in the exposure device shown in FIG. 4 and FIG. 6 shows a plan view of a filter utilized in a modi- 3 fied exposure device.
  • FIG. 4 shows one example of the exposure device 11 embodying the invention.
  • the exposure device 11 comprises asource of light 12, and a correction lens 13 utilized for the purpose of causing the locus of the light emanating from the source of light 12 and transmitted through the correction lens 13 to approximate the locus of the scanning electron beam of the completed colour picture tube.
  • the panel 15' of the tube provided with a shadow mask 14 is mounted on the upper end of the exposure device 11.
  • the inner surface of the panel 15 is coated with photosensitive film which is exposed to the light emanating from the source of light and transmitting through the correction lens 13 and the shadow mask 14 so as to form the dot pattern of a fluorescent screen of a prescribed pattern.
  • FIG. 6 shows a plan view of a filter l9 utilized in a modified embodiment of this invention.
  • the filter 19 comprises a transparent substrate of glass or the like on which are applied a plurality of longitudinal and transverse lines 20 of opaque substance which intersect at right angles to form a check pattern.
  • the filter is combined with the conventional correction lens shown in FlGS. 1 and 2 to form a correction lens system which is used to expose the photosensitive film coated on the inner surface of the panelult will be clear that this correction lens system operates in the same manner as the correction lens shown in FIG. 5.
  • check patterns were formed by applying a plurality of longitudinal and transverse lines of opaque substance on the surface of the correction lens or filter, it should be understood that the same object can also be accomplished by forming straight lines that restrict transmission of light on the surface of the correction lens or filter as by applying lines of translucent substance or cutting straight grooves in the form of a check pattern.
  • the invention provides an improved exposure device that can uniformly expose the photosensitive film on the face plate ofa colour picture tube thereby reproducing pictures of excellent quality.
  • an exposure device for manufacturing a colour picture tube of the type comprising a source of light, and a correction lens having an effective surface divided by boundary lines in the form of steep surface discontinuities into a plurality of discontinuous regions surrounded by said boundary lines, said lens disposed between the panel of said tube and said source of light whereby the photosensitive film coated on the inner surface of said panel is exposed to the light emanating from said source and transmitted through said correction lens to form the dot pattern of a fluorescent screen
  • the improvement which comprises line means associated with said correction lens and positioned on opposite sides of each of said boundary lines and spaced therefrom for restricing the light transmitted through said discontinuous region to thereby substantially uniformly expose said photosensitive film.
  • check pattern comprises a plurality of lines of opaque substance applied on the surface of said rectangular regions and intersecting each other at right angles in said regions.
  • said check pattern comprises a plurality of straight grooves formed on the surface of said rectangular regions and intersecting each other at right angles in said regions.
  • said line means' comprises a filter combined with said correction lens, said filter including a transparent substrate and said check pattern formed and positioned on said transparent substrate for restricting the light transmitted through said transparent substrate and through said rectangular regions of said correction lens.
  • said check pattern comprises a plurality of lines of opaque substance applied on the surface of said subtersecting each other at right angles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Lenses (AREA)
US00231313A 1971-03-05 1972-03-02 Exposure device for manufacturing colour picture tubes Expired - Lifetime US3788200A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46011274A JPS5040938B1 (ja) 1971-03-05 1971-03-05

Publications (1)

Publication Number Publication Date
US3788200A true US3788200A (en) 1974-01-29

Family

ID=11773387

Family Applications (1)

Application Number Title Priority Date Filing Date
US00231313A Expired - Lifetime US3788200A (en) 1971-03-05 1972-03-02 Exposure device for manufacturing colour picture tubes

Country Status (3)

Country Link
US (1) US3788200A (ja)
JP (1) JPS5040938B1 (ja)
GB (1) GB1370082A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953209A (en) * 1973-08-20 1976-04-27 Rca Corporation Method for preparing supplemental filter for lighthouse
US4866466A (en) * 1987-05-27 1989-09-12 U.S. Philips Corporation Method of producing a color picture tube screen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53152029U (ja) * 1977-05-06 1978-11-30

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568448A (en) * 1947-09-23 1951-09-18 Gen Electric Parallax correction in color television
US3279340A (en) * 1964-03-19 1966-10-18 Rca Corp Art of making color-phosphor mosaic screens
US3601018A (en) * 1968-08-26 1971-08-24 Zenith Radio Corp Method and apparatus for exposing curved substrates

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918572A (ja) * 1972-06-14 1974-02-19

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568448A (en) * 1947-09-23 1951-09-18 Gen Electric Parallax correction in color television
US3279340A (en) * 1964-03-19 1966-10-18 Rca Corp Art of making color-phosphor mosaic screens
US3601018A (en) * 1968-08-26 1971-08-24 Zenith Radio Corp Method and apparatus for exposing curved substrates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953209A (en) * 1973-08-20 1976-04-27 Rca Corporation Method for preparing supplemental filter for lighthouse
US4866466A (en) * 1987-05-27 1989-09-12 U.S. Philips Corporation Method of producing a color picture tube screen

Also Published As

Publication number Publication date
DE2210725A1 (de) 1972-09-14
JPS5040938B1 (ja) 1975-12-27
DE2210725B2 (de) 1975-11-13
GB1370082A (en) 1974-10-09

Similar Documents

Publication Publication Date Title
US3652895A (en) Shadow-mask having graduated rectangular apertures
US3784282A (en) Correcting lens used to form fluorescent screens of colour television receiving tubes
US3661580A (en) Photographic method for producing a cathode-ray tube screen structure
US3619030A (en) Fiber optics element
US3788200A (en) Exposure device for manufacturing colour picture tubes
US3783754A (en) Method and apparatus for manufacturing color picture tubes
GB1582185A (en) Method for inspecting cathode-ray-tube window for objectionable cord
US4132470A (en) Exposure device for the manufacture of display screens of color television display tubes and display tube manufactured by means of such a device
GB1481979A (en) Light exposure apparatus for manufacturing colour picture tube
US3893750A (en) Cathode-ray tube screening correction lens with a non-solarizing material
GB802908A (en) Improvements in and relating to the manufacture of masks of varying opacity and to screen structures for cathode ray tubes
US4855200A (en) Fluorescent screens of color picture tubes and manufacturing method therefor
US3809558A (en) Exposure devices utilized to manufacture color picture tubes
US3198634A (en) Method of depositing particulate solid material on selected portions of a substrate
CN1135808A (zh) 彩色阴极射线管及其制造方法
EP0175520A2 (en) Methods of making fluorescent surfaces in beam index type colour cathode ray tubes
GB1416753A (en) Methods of manufacture of colour picture tubes
US3988632A (en) Black-surround color picture tube
CA1212857A (en) Photodepositing a crt screen structure using discrete- element optical filter
US3579335A (en) Method for manufacturing color television receiver tubes
JP3300459B2 (ja) カラー受像管の蛍光面形成用光量補正フィルターおよびカラー受像管の蛍光面露光方法
GB1416752A (en) Methods of manufacture of colour picture tubes
JPS5845776B2 (ja) カラ−受像管用螢光面の形成方法およびその形成装置
JPH11204030A (ja) カラー陰極線管の蛍光面形成用の光量補正フィルター、およびこれを備えた露光装置
JPS57196454A (en) Cathode-ray tube