US3766419A - Cathode-ray tube with shadow mask having random web distribution - Google Patents

Cathode-ray tube with shadow mask having random web distribution Download PDF

Info

Publication number
US3766419A
US3766419A US00305244A US3766419DA US3766419A US 3766419 A US3766419 A US 3766419A US 00305244 A US00305244 A US 00305244A US 3766419D A US3766419D A US 3766419DA US 3766419 A US3766419 A US 3766419A
Authority
US
United States
Prior art keywords
rows
webs
cathode
ray tube
row
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
US00305244A
Other languages
English (en)
Inventor
R Barbin
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.)
RCA Licensing Corp
Original Assignee
RCA 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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US3766419A publication Critical patent/US3766419A/en
Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
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
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/076—Shadow masks for colour television tubes characterised by the shape or distribution of beam-passing apertures

Definitions

  • a cathode ray tube having a color phosphor screen structure comprising a plurality of arrays of substantially parallel lines.
  • the lines in each array are adapted to emit light of a particular color.
  • a shadow mask having a plurality of substantially parallel rows of apertures that are elongated in the direction of the rows and separated from adjacent apertures in each row by webs, is spaced from the screen. The webs are randomly spaced along each row and the webs in adjacent rows are randomly displaced from one another in the direc tion of the rows. Alternatively, the web spacing in each row can be uniform and the rows randomly displaced from one another in the direction of the rows.
  • This invention relates to shadow mask type cathoderay tubes. More particularly, it relates to a color television picture tube havingan elongated or slit-type aperture shadow mask.
  • One method that has been found to be effective in reducing moire is to choose the spacing between apertures such that if a first scan line coincides with the center of a row of apertures, the second line will lay halfway' between rows of apertures. In this case, a vertical shift in the location of the line causes the first line to get dimmer and the second line brighter so that when the eyes of an observer integrate the light from both lines, the observer does not discern the light and dark pattern.
  • This approach has several drawbacks. For example, it reduces moire only for one scan line spacing and therefore, moire still occurs when there are variations in vertical scan line height and spacing.
  • scan line spacings must be used for different tube sizes and for different scanning frequencies, (e.g., US. 525 lines vs. European 625 lines).
  • the novel cathode-ray tube comprises a color phosphor screen structure comprising a plurality of arrays of substantially parallel lines.
  • the lines in each array are adapted to emit light of a particular color.
  • a shadow mask having a plurality of substantially parallel rows of apertures that are elongatedin the direction .of the rows and separated from adjacent apertures in each rowby webs, is spaced from the screen. The-rows are randomly displaced from one another in the directionof said rows.
  • the present invention avoids the problem of moire by randomizing the horizontal pattern of webs between apertures of the shadow mask. Therefore,v there is no there is no regular or repeatable web pattern.
  • FIG. 1 is a side view of a novel shadow mask color television picture tube embodying the present invention.
  • FIG. 2 is a cross-sectional view taken on line 2-2 of FIG. 1.
  • FIG. 3 is a cross-sectional view on line 3-3 of FIG. 2.
  • FIG. 4 is an enlarged view of FIG. 5 outlined portion illustrating web and slit details of the shadow mask tube of FIG. 1.
  • FIG. 5 is an enlarged view of mask and screen details of the tube of FIG. 1.
  • FIG. 6 is an enlarged view illustrating web and slit details of an alternate shadow mask for the tube of FIG. 1.
  • FIG. 1 depicts a novel cathode-ray tube in the form of a rectangular color television picture tube 10 having a longitudinal axis AA.
  • the tube 10 comprises an evacuated glass envelope 12 including a faceplate panel 14 having a spherically curved, viewing window 16.
  • the envelope 12 also includes a funnel portion 18 and a neck portion 20.
  • An electron gun 22 within the neck 20 is adapted to project at least one, and preferably three, electron beams through a magnetic deflection yoke 24 which upon being suitable energized, causes the beams to scan in a rectangular raster over a color viewing screen 26 (see also FIGS. 2 and 3) on the inner surface of the window 16.
  • the screen 26 is composed of a plurality of arrays of parallel strips or lines 28 of phosphor fluorescing in different colors.
  • the color strips 28 may, for example, comprise cyclically successive strips of red-emitting, green-emitting and blue-emitting phosphors.
  • an apertured, shadow mask 30 which is part of a shadow mask-frame assembly 31, is mounted adjacent to the screen 26 in the path of the electron beams so that electrons from each pass through the apertures in the mask to impinge selectively upon strips of one emission color on the screen.
  • Dashed lines 32 outline the average maximum vertical deflection angle for three beams in a rectangular tube.
  • the shadow mask 30 has a horizontal major axis X-X and a vertical minor axis Y-Y as shown in FIG. 2.
  • the electron beams scan the mask and screen in a direction transverse to the minor axis. Stated'more specifically, the electron beams traverse a multiplicity of substantially horizontally extending, vertically spaced scan lines to produce a raster on the screen.
  • the shadow mask-frame assembly 32 comprises a somewhat spherically curved, sheet metal shadow mask 30, secured to a frame 34 as shown in FIGS. 2 and 3.
  • the frame 34 may be a continuously formed metal strip of generally L-shaped cross-section. Included in the frame 34 is a first or axial flange 36, which extends in the same direction as the tube axis A-A, and a second or transverse flange 38.
  • the second or transverse flange 38 extends inwardly from the axial flange 38 toward the tube axis and may serve as an electron shield for preventing appreciable impingement of electrons upon the periphery of the shadow mask 30 and upon the axial flange 36 during overscan of the beams at maximum deflection angles.
  • the shadow mask 30 includes a central apertured portion 40 surrounded by an imperforate border portion 42.
  • the border portion includes a peripheral skirt 44 which extends axially relative to the tube axis A-A and is attached to mask frame 34.
  • the skirt 44 telscopically engages, and is welded to the axial flange 36 of the frame 34.
  • FIGS. 1, 2, 3 and of the drawings cludes a multiplicity of apertures 50 in the form of slits for electron transmission through the mask.
  • the sizes of the slits, as well as of the phosphor lines 28, have been exaggerated for purposes of illustration.
  • Slits 50 are arrayed in generally equally horizontally spaced parallel rows, extending in the direction of the vertical minor axis YY of the shadow mask.
  • the slits are oriented with their major axes aligned with the direction of the rows and extend in the direction of the Apertured portion 70, outlined in FIG. 5, of the shadow mask 30 also includes a multiplicity of web portions identified as 52, 54, 56 and 58 in FIG. 4. The webs separate the apertures 50 in the direction of the vertical minor axis of the shadow mask.
  • the distribution of the webs of the apertured portion of the shadow mask 30 is random in the direction of the minor axis Y-Y of the mask and all webs in adjacent rows are randomly displaced from one another in the direction of the rows. That is to say, in contrast to the regular or patterned spacing of the web arrays of the prior art, the vertical spacing of the webs of the apertured portion is random in nature.
  • random refers to chance selection from population which may be restricted in one or more ways.
  • the distribution of the webs is such-that the mask does not exhibit any substantial line structure in the direction of the major axis of the shadow mask (i.e., perpendicular to the rows of slits).
  • the regularity or patterned spacing of the web array established a recognizable line structure in the shadow mask defined by webs aligned along each of a multiplicity of horizontal lines. With a random web array spacing, such as embodied in shadow mask 30, there is no such line structure.
  • FIG. 4 The random nature of the web array spacing of the preferred embodiment is illustrated in FIG. 4 considered in conjunction with the accompanying'TABLE of random values for web centerline ordinates, wherein each ordinate corresponds to a distance from a datum to the center of a particular web. 4
  • the ordinate of the first web 56 inRow 2 is 0.017 and the ordinate of the second web 58 in Row 2 is 0.085. Further correlation between the TABLE and FIG. 4 can be made by continuing to measure each web ordinate in the TABLE vertically from the zero ordinate established for the web 52,
  • the TABLE as a whole prescribes a web array for an elemental area of the apertured portion of the shadow mask.
  • the maximum slit length desirable is of magnitude sufficient to provide the apertured portion of the mask with adequate strength to hold its form.
  • a minimum web spacing is also desirable for reasons primarily having to do with electron transmission through the mask 30. When the webs are too close together, not enough electrons are permitted to pass through the mask 30 and the picture is too dark to be of acceptable viewing quality. Accordingly, the minimum web spacing is of sufficient magnitude to provide 0 the apertured portion of the shadow mask with electron transmission of at least 15 percent at the mask center to produce a bright picture on the screen. A minimum web spacing of about 30 mils (measured between web centerlines) is employed in the preferred embodiment.
  • the entire apertured portion of the mask could be formed with nonrepeated random lines throughout.
  • the apertured portion of the mask may be made up of a plurality of interleaved, adjoining, duplicate, elemental areas. Utilization of such elemental areas does not destroy the random effect of the mask web array as a whole.
  • the interfitted duplicate construction is used in the preferred embodiment as illustrated in FIG. 5.
  • FIG. 5 depicts an enlarged area of the apertured portion of the shadow mask 30, and illustrates how a plurality of elemental areas 60, each having a random web array as prescribed in the TABLE above, are repeated in building-block fashion. These elemental areas 60 are repeated to cover the entire apertured portion of the shadow mask 30.
  • each elemental area 60 is about 1.2 inches in height and about 0.96 inches in width.
  • the TABLE sets forth the complete web array for one such elemental area.
  • the dimensions of the elemental area are determined by several considerations. One consideration is that the area should be sufficiently large so that area repetition will not destroy the random effect of the web array as a whole in preventing moire. About a l-inch square area meets this requirement.
  • each elemental area of the preferred embodiment is 1.2 inch in height, measured from the centerline of the lowermost web to the centerline of the topmost web.
  • a horizontal slit spacing of 24 mils (measured between slit centerlines) is employed in the preferred embodiment. Forty rows of slits is a convenient number with which to work, and 40 times 24 mils equals 0.960 inches, which is very close to the l-inch squire prescription. Accordingly, the elemental area is determined to be 0.96 inch in width, measured from the midpoint between Row 1 and the last row in the left adjacent elemental area to the midpoint between Row 40 and the first row of the right adjacent elemental area. Use of the horizontal slit spacing to determine the width of the elemental area may also be viewed as a restriction on web placement.
  • the slit width is 7 mils, which is desirable for tubes having a light absorbing matrix material (not shown) between phosphor areas.
  • a narrower slit width e.g., 4.3 mils, may be used for nonmatrix tubes.
  • FIG. 4 which embraces fragments of four elemental areas 60A, 60B, 60C and 60D of FIG. 5, as defined by the vertical and horizontal dashed lines 61a and 61b, respectively.
  • the interleaving is by randomly varying distances, as appears hereinafter.
  • the average web spacing is used to determine the exact height dimensions of the elemental area. To maintain that height dimension across the width of the area, i.e., for each row, the average web spacing of each row in the elemental area is the same as the average web spacing of the other rows. At the same time, to provide for interleaving and avoid impairment of the random nature of the web array, rows of adjacent elemental areas have their lowermost web ordinate displaced from the zero ordinate of Row 1 a random distance up to the average web spacing of the rows. Since each row is still 1.2 inches in height, the top web ordinate of each row will also be displaced the same distance from the top web ordinate of Row 1.
  • each 1.2 inch row is displaced vertically a distance corresponding to the displacement of its lowermost web ordinate.
  • the lowermost web ordinate in each row is randomly selected with the restrictionthatit be a value which is not greater than the average adjacent web spacing, but is at least equal to the minimum required displacement for webs in adjacent rows from the lower-- most web in the preceding (next-left) row.
  • the tops of the rows of elemental area 60B interleave with the bottoms of the rows of elemental area 60A.
  • the bottom of Row 2 of area 60A is displaced 0.017 inch.
  • the centerline ordinate of the web 56 is coincident with the uppermost ordinate for Row 2 of the elemental area 60B, and similarly the same is true for all top ordinates of the elemental area 60B and all bottom ordinates of the elemental area 60A.
  • the general outline of the area is slightly higher than 1.2 inches. That is to say, the outline of the area will have a height which is equal to the sum of 1.2 inches plus the maximum displacement of any row from the zero ordinate. As previously indicated, such maximum displacement in the preferred embodiment is not greater than the average web spacing of a row.
  • the webs of the last row (Row 40) of each elemental area are displaced at least the minimum required distance from the webs of the first row(Row 1), since each Row 40 is placed horizontally adjacent a Row 1 when the elemental areas are repeated.
  • random web arrays are generated on a suitably programmed digital computer, such as an RCA Spectra /45 computer manufactured'by RCA Corporation, New York, NY.
  • This computer can be equipped with a random number generator and programmed in a conventional way to produce random,
  • the array is 0.960 inch in width and no two webs in adjacent rows are less than 10 mils apart.
  • the population is also limited to a maximum and minimum web spacing in each row of .80 and 40, respactively, since it is necessary to program narrower maximum and minimum limits than the approximately 90 and 30 desired to assure that the computer can remain within the maximum and minimum guidelines when normalizing each row to 1.2 inches in height.
  • the computer then generates the web ordinates reproduced in the TABLE.
  • the ordinates generated by the computer are used in a program to control a plotter (such as a Gerber Model No. 632 plotter manufactured by Gerber Scientific Co., Hartford, Conn.) in a conventional manner to obtain a photographic plate of an elemental area.
  • This plate has clear areas corresponding to the slit locations surrounded by opaque unexposed areas.
  • the plate of the elemental area next is used as a negative and moved through a plurality of steps to expose a larger first master plate which will contain the entire shadow mask pattern.
  • This first master may then be reduced in size by a technique'employing a series of photographic reproductions until eventually two final masters are obtained that are to be used in exposing both sides of the shadow mask sheet material.
  • one of these final masters has larger slit areas than the other so that each slit will have slanted sides opening toward the screen. Also by using various known photographic techniques it is possible to grade the size of the slit areas over each final master to provide for various misregistration errors of the electron beam.
  • the final masters are placed in accurate alignment on opposite sides of a flat metal sheet that is to become a shadow mask.
  • the sheet is coated with a photoresist that is exposed by passing light through each final master. Thereafter the photoresist is developed and the unexposed areas (corresponding to slit areas) are washed away. Next, the uncoated slit areas are etched in a conventional manner until the final slits are formed.
  • the apertured portion of such a mask in a 15-inch viewable diagonal rectangular cathode ray tube has a major axis length of 1 1.820 inches and a minor axis height of 8.858 inches.
  • the flat mask is then formed into a spherically curved shape and it should be noted that all dimensions given hereinabove including the web spacings defined in the TABLE are for a flat mask and that the forming operation may produce small variations from the fiat mask dimensions in various regions of the mask, as a result of metal flow in the forming operation.
  • shadow mask 70 Another embodiment of a shadow mask 70 is illustrated in the enlarged partial view of FIG. 6.
  • all apertures 72 are of equal length and aligned in vertical rows.
  • the spacing between each aperture in each row is identical to the spacing between apertures in each other row.
  • the vertical positions of each row are varied randomly so that webs 73 in adjacent rows are randomly displaced from one another in the direction of the rows.
  • the apertured portion of the mask 70 can be made up of a plurality of interleaved, adjoining, duplicate elemental areas as previously described. In FIG. 6, these areas designated as 74A-74D, are interleaved as previously discussed.
  • Shadow masks embodying the present invention are highly advantageous.
  • a random web array can be used for any tube height,or for any raster irrespective of the number of scan lines, without appearance of moire.
  • With a random web array there can never be a troublesome moire-producing web pitch-scan line pitch relationship for the reason that a random web array has no definite vertical or horizontal web pattern to enter into such a relationship.
  • television set malfunctions causing imperfect linearity can never produce moire, for the same reason.
  • a single random row may be generated and that row randomly repeated, staggered or displaced vertically relative to each adjacent row, in order to produce a random web array.
  • each web may be prescribed to have a particular percentage ratio to its random spacing from a vertically adjacent web, so that the web heights vary as well as .the ordinates.
  • a cathode-ray tube having a color phosphor line screen structure comprising a plurality of arrays of substantially parallel phosphor lines, the phosphor lines in each array being adapted to emit light of a particular color, and a shadow mask spaced from said screen, said shadow mask having a plurality of substantially parallel rows of apertures being elongated in the direction of said rows and the apertures in each row being separated by webs, the improvement comprising:
  • said rows being randomly displaced from one another in the direction of said rows.
  • cathode-ray tube as defined in claim '1 including said webs being randomly spaced along each row.
  • the cathode-ray tube as defined in claim 1 including said webs being uniformly spaced along'each row.
  • a cathode-ray tube having a color phosphor line screen structure comprising a plurality of arrays of substantially parallel phosphor lines, the phosphor lines in each array being adapted to emit light of a particular color, and a shadow mask spaced from said screen, said shadow mask having a plurality of substantially parallel rows of apertures aligned with said phosphor lines, said apertures being elongated in the direction of said rows and the apertures in each row being separated by webs, the improvement comprising:
  • said webs being randomly spaced along each row and all webs in adjacent rows being randomly displaced from one another in the direction of said rows.
  • random spacing along each row is such as to provide a self-supporting mask with at least 15 percent transmission at the mask center.
  • a cathode-ray tube having a color phosphor line screen structure comprising a plurality of arrays of substantially parallel phosphor lines, the phosphor lines in each array being adapted to emit light of a particular color, and a shadow mask spaced from said screen, said shadow mask having a plurality of substantially parallel rows-of apertures aligned with said phosphor lines, said apertures being elongated in the direction of said rows and the apertures in each row being separated by webs, the improvement comprising:
  • said webs being randomly spaced along each row a distance to provide a self-supporting mask with at least 15% transmission at the mask center and all webs in adjacent rows being randomly displaced from one another in the direction of said rows a distance to provide a self-supporting mask.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
US00305244A 1972-11-10 1972-11-10 Cathode-ray tube with shadow mask having random web distribution Expired - Lifetime US3766419A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30524472A 1972-11-10 1972-11-10

Publications (1)

Publication Number Publication Date
US3766419A true US3766419A (en) 1973-10-16

Family

ID=23179991

Family Applications (1)

Application Number Title Priority Date Filing Date
US00305244A Expired - Lifetime US3766419A (en) 1972-11-10 1972-11-10 Cathode-ray tube with shadow mask having random web distribution

Country Status (8)

Country Link
US (1) US3766419A (enrdf_load_html_response)
JP (1) JPS50744A (enrdf_load_html_response)
CA (1) CA998420A (enrdf_load_html_response)
DE (1) DE2356461A1 (enrdf_load_html_response)
FR (1) FR2208184B1 (enrdf_load_html_response)
GB (1) GB1450597A (enrdf_load_html_response)
IT (1) IT998831B (enrdf_load_html_response)
NL (1) NL7315386A (enrdf_load_html_response)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2642674A1 (de) * 1975-09-22 1977-03-24 Rca Corp Elektronenstrahl-wiedergabeeinrichtung
EP0001673A3 (en) * 1977-10-26 1979-05-16 N.V. Philips' Gloeilampenfabrieken Colour selection electrode with elongate apertures in a colour display tube
US4186326A (en) * 1973-06-18 1980-01-29 Matsushita Electronics Corporation Shadow mask having vertical pitch about 8/(2n-1) times horizontal pitch
FR2443135A1 (fr) * 1978-11-30 1980-06-27 Rca Corp Perfectionnements apportes a la fabrication de masques perfores pour tubes a rayons cathodiques
US4210842A (en) * 1975-09-10 1980-07-01 Hitachi, Ltd. Color picture tube with shadow mask
US4293791A (en) * 1979-11-15 1981-10-06 Rca Corporation Color picture tube having improved corrugated apertured mask
US4296189A (en) * 1979-05-24 1981-10-20 Rca Corporation Color picture tube having improved slit type shadow mask and method of making same
US4326147A (en) * 1975-08-18 1982-04-20 Hitachi, Ltd. Slotted shadow mask having apertures spaced to minimize moire
US4631440A (en) * 1985-04-29 1986-12-23 North American Philips Consumer Electronics Corp. Color cathode ray tube having smooth screen edges
US4973879A (en) * 1989-01-27 1990-11-27 Mitsubishi Denki Kabushiki Kaisha Shadow mask type color CRT
US4983879A (en) * 1987-12-17 1991-01-08 Mitsubishi Denki Kabushiki Kaisha Shadow mask type color cathode ray tube with shadow mask effective to minimize the appearance of Moire patterns
US4990832A (en) * 1990-05-22 1991-02-05 Rca Licensing Corporation Color display system
FR2651400A1 (fr) * 1989-08-22 1991-03-01 Sextant Avionique Structure bidimensionnelle, formee d'elements ponctuels, pour l'elaboration d'une image, et procede d'elaboration d'une telle structure.
US5000711A (en) * 1990-07-02 1991-03-19 Rca Licensing Corporation Method of making color picture tube shadow mask having improved tie bar locations
US5243253A (en) * 1991-07-30 1993-09-07 Thomson Consumer Electronics, Inc. Color picture tube having shadow mask with improved tie bar grading
US6242855B1 (en) 1998-03-20 2001-06-05 Videocolor, S.P.A. Color picture tube shadow mask having a column-to-column spacing with a pseudo-cyclic variation
US20010033129A1 (en) * 2000-04-25 2001-10-25 Matsushita Electric Industrial Co., Ltd. Color cathode ray tube
US6710527B2 (en) * 2000-08-04 2004-03-23 Matsushita Electric Industrial Co., Ltd. Cathode ray tube with slit in dead space of shadow mask
US20040189178A1 (en) * 2003-03-28 2004-09-30 Hisakazu Yamane Strip-type mask assembly for color cathode-ray tube
US20040239230A1 (en) * 2003-02-10 2004-12-02 Sung-Hun Kim Cathode ray tube
US20140045293A1 (en) * 2012-08-07 2014-02-13 Pu Ni Tai Yang Neng (Hangzhou) Co., Limited Fabrication of interconnected thin-film concentrator cells using shadow masks

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5140072A (en) * 1974-09-30 1976-04-03 Matsushita Electric Industrial Co Ltd Karaajuzokan
GB1546889A (en) * 1975-03-19 1979-05-31 Rca Corp Cathode ray tube having shadow mask
JPS6011560A (ja) * 1983-06-29 1985-01-21 Teikoku Kako Kk 真珠光沢顔料の製造法
JPH02103847A (ja) * 1988-10-11 1990-04-16 Mitsubishi Electric Corp シヤドウマスク式カラー陰極線管
US5055736A (en) * 1990-03-30 1991-10-08 Samsung Electron Devices Co., Ltd. Shadow mask for use in a three-gun color picture tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690518A (en) * 1953-06-01 1954-09-28 Columbia Broadcasting Syst Inc Color picture tube
US2863079A (en) * 1955-05-27 1958-12-02 Kendon Electronics Inc Masking devices for color television screen or the like
DE2012046A1 (de) * 1969-03-14 1970-10-01 Tokyo Shibaura Electric Co. Ltd., Kawasaki (Japan) Lochmasken-Farbbildröhre und Verfahren zu deren Herstellung
US3652895A (en) * 1969-05-23 1972-03-28 Tokyo Shibaura Electric Co Shadow-mask having graduated rectangular apertures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690518A (en) * 1953-06-01 1954-09-28 Columbia Broadcasting Syst Inc Color picture tube
US2863079A (en) * 1955-05-27 1958-12-02 Kendon Electronics Inc Masking devices for color television screen or the like
DE2012046A1 (de) * 1969-03-14 1970-10-01 Tokyo Shibaura Electric Co. Ltd., Kawasaki (Japan) Lochmasken-Farbbildröhre und Verfahren zu deren Herstellung
US3652895A (en) * 1969-05-23 1972-03-28 Tokyo Shibaura Electric Co Shadow-mask having graduated rectangular apertures

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186326A (en) * 1973-06-18 1980-01-29 Matsushita Electronics Corporation Shadow mask having vertical pitch about 8/(2n-1) times horizontal pitch
US4326147A (en) * 1975-08-18 1982-04-20 Hitachi, Ltd. Slotted shadow mask having apertures spaced to minimize moire
US4210842A (en) * 1975-09-10 1980-07-01 Hitachi, Ltd. Color picture tube with shadow mask
DE2642674A1 (de) * 1975-09-22 1977-03-24 Rca Corp Elektronenstrahl-wiedergabeeinrichtung
EP0001673A3 (en) * 1977-10-26 1979-05-16 N.V. Philips' Gloeilampenfabrieken Colour selection electrode with elongate apertures in a colour display tube
US4300070A (en) * 1978-11-30 1981-11-10 Rca Corporation Cathode-ray tube screen border improvement
FR2443135A1 (fr) * 1978-11-30 1980-06-27 Rca Corp Perfectionnements apportes a la fabrication de masques perfores pour tubes a rayons cathodiques
US4296189A (en) * 1979-05-24 1981-10-20 Rca Corporation Color picture tube having improved slit type shadow mask and method of making same
US4293791A (en) * 1979-11-15 1981-10-06 Rca Corporation Color picture tube having improved corrugated apertured mask
US4631440A (en) * 1985-04-29 1986-12-23 North American Philips Consumer Electronics Corp. Color cathode ray tube having smooth screen edges
EP0321202B1 (en) * 1987-12-17 1998-04-29 Mitsubishi Denki Kabushiki Kaisha Shadow mask type color cathode ray tube
US4983879A (en) * 1987-12-17 1991-01-08 Mitsubishi Denki Kabushiki Kaisha Shadow mask type color cathode ray tube with shadow mask effective to minimize the appearance of Moire patterns
US4973879A (en) * 1989-01-27 1990-11-27 Mitsubishi Denki Kabushiki Kaisha Shadow mask type color CRT
FR2651400A1 (fr) * 1989-08-22 1991-03-01 Sextant Avionique Structure bidimensionnelle, formee d'elements ponctuels, pour l'elaboration d'une image, et procede d'elaboration d'une telle structure.
US4990832A (en) * 1990-05-22 1991-02-05 Rca Licensing Corporation Color display system
US5000711A (en) * 1990-07-02 1991-03-19 Rca Licensing Corporation Method of making color picture tube shadow mask having improved tie bar locations
US5243253A (en) * 1991-07-30 1993-09-07 Thomson Consumer Electronics, Inc. Color picture tube having shadow mask with improved tie bar grading
US6242855B1 (en) 1998-03-20 2001-06-05 Videocolor, S.P.A. Color picture tube shadow mask having a column-to-column spacing with a pseudo-cyclic variation
US20010033129A1 (en) * 2000-04-25 2001-10-25 Matsushita Electric Industrial Co., Ltd. Color cathode ray tube
US6784607B2 (en) * 2000-04-25 2004-08-31 Matsushita Electric Industrial Co., Ltd. Color cathode ray tube
US6710527B2 (en) * 2000-08-04 2004-03-23 Matsushita Electric Industrial Co., Ltd. Cathode ray tube with slit in dead space of shadow mask
US20040239230A1 (en) * 2003-02-10 2004-12-02 Sung-Hun Kim Cathode ray tube
US7005785B2 (en) * 2003-02-10 2006-02-28 Lg Philips Displays Korea Co., Ltd. Cathode ray tube with strengthened shadow mask
US20040189178A1 (en) * 2003-03-28 2004-09-30 Hisakazu Yamane Strip-type mask assembly for color cathode-ray tube
US20140045293A1 (en) * 2012-08-07 2014-02-13 Pu Ni Tai Yang Neng (Hangzhou) Co., Limited Fabrication of interconnected thin-film concentrator cells using shadow masks
US8963270B2 (en) * 2012-08-07 2015-02-24 Pu Ni Tai Neng (HangZhou) Co., Limited Fabrication of interconnected thin-film concentrator cells using shadow masks

Also Published As

Publication number Publication date
GB1450597A (en) 1976-09-22
FR2208184A1 (enrdf_load_html_response) 1974-06-21
NL7315386A (enrdf_load_html_response) 1974-05-14
IT998831B (it) 1976-02-20
JPS50744A (enrdf_load_html_response) 1975-01-07
FR2208184B1 (enrdf_load_html_response) 1976-06-18
DE2356461A1 (de) 1974-05-16
CA998420A (en) 1976-10-12

Similar Documents

Publication Publication Date Title
US3766419A (en) Cathode-ray tube with shadow mask having random web distribution
US3652895A (en) Shadow-mask having graduated rectangular apertures
US3947718A (en) Shadow mask having elongated apertures concave to vertical center line and increasing in pitch along x-axis with distance from said line
CA1086810A (en) Color cathode ray tube having a striped phosphor screen
US3973159A (en) Cathode-ray tube for displaying colored pictures
EP0239083B1 (en) Flat shadow mask for color cathode ray tube
US4983879A (en) Shadow mask type color cathode ray tube with shadow mask effective to minimize the appearance of Moire patterns
US4070596A (en) 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
EP0707335A1 (en) Display apparatus having an enhanced resolution shadow mask and method of making same
US3663854A (en) Shadow-mask having rectangular apertures
KR100239618B1 (ko) 슬롯형 새도우 마스크
US3705322A (en) Shadow mask having apertures at intersections of barrel-shaped horizontal and pin-cushion-shaped vertical lines
KR100310404B1 (ko) 컬러음극선관용섀도우마스크및그의제조방법
US4300069A (en) Color picture tube having improved slit type shadow mask and method of making same
US5086250A (en) Color cathode ray tube having shadow mask with some long, narrow apertures
KR930007362B1 (ko) 칼라 표시관
US3979630A (en) Shadow mask color picture tube having non-reflective material between elongated phosphor areas and positive tolerance
US3721853A (en) Shadow mask having apertures at intersections of barrel-shaped and pincushion shaped lines
US4300070A (en) Cathode-ray tube screen border improvement
US3777204A (en) Tri-color cathode ray tube employing a shadow mask having elongated apertures
US2937297A (en) Image display device
US3486061A (en) Cathode-ray tube for displaying color pictures
EP0203636B1 (en) Colour cathode ray tube having smooth screen edges
US4271247A (en) Color picture tube with screen having light absorbing areas
US4701665A (en) Color cathode-ray tube

Legal Events

Date Code Title Description
AS Assignment

Owner name: RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, P

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RCA CORPORATION, A CORP. OF DE;REEL/FRAME:004993/0131

Effective date: 19871208