US3889145A - Color cathode ray tube with phosphor strips concave toward vertical center line - Google Patents

Color cathode ray tube with phosphor strips concave toward vertical center line Download PDF

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Publication number
US3889145A
US3889145A US393028A US39302873A US3889145A US 3889145 A US3889145 A US 3889145A US 393028 A US393028 A US 393028A US 39302873 A US39302873 A US 39302873A US 3889145 A US3889145 A US 3889145A
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US
United States
Prior art keywords
tube
apertures
mask
axis
screen
Prior art date
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Expired - Lifetime
Application number
US393028A
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English (en)
Inventor
Takeshi Suzuki
Hiroshi Tanaka
Takeo Ito
Hiroaki Komatsu
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Toshiba Corp
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Tokyo Shibaura Electric Co Ltd
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Filing date
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Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
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Publication of US3889145A publication Critical patent/US3889145A/en
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    • 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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
    • H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
    • H01J29/325—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television with adjacent lines
    • 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
    • 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
    • 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
    • H01J9/2278—Application of light absorbing material, e.g. between the luminescent areas

Definitions

  • a color cathode ray tube comprising curved screen including elemental phosphor stripes running cyclically, red, green and blue, a shadow mask adjacent the curved screen and having a plurality of small rectangular apertures, and an electron gun means generating [30] Foreign Application Priority Data Aug. 30, 1972 three electron beams arranged in a common plane,
  • This invention relates to an improved color cathode ray tube, and more particularly to a color cathode ray tube in which the improved shadow mask having apertures in the form of slits and the improved screen having smooth edged continuous elemental phosphor stripes are used to give a sufficient electron beam landing tolerance, especially near the edges of the screen.
  • a color cathode ray tube of a new type, called inline gun type has been developed to eliminate such difficulties. It has an image screen including a plurality of phosphor stripes spaced from each other by intermediate stripes made of light absorbing material, a slotted shadow mask adjacent to the screen and an electron gun means for projecting a central beam and a pair of side beams which are disposed in the same plane.
  • FIG. 1 of the accompanying drawings which shows a new type color cathode ray tube including a phosphor screen 11 coated on the inner surface of a face plate, a plurality of elemental phosphor stripes are arranged cyclically, green, blue and red color phosphor stripes 12G, 12B and 12R, respectively, and light absorbing stripes 13 are placed between and adjoining the color phosphor stripes 126, 128 and 12R.
  • the shadow mask 14 of this new tube have a plurality of small rectangular apertures 15 being vertically spaced apart by thin traverse bridge portions 16. These thin bridge portions are significant to form the mask into a spherical contour by pressing.
  • the three electron guns of this tube are placed horizontally adjacent in a so-called in-line configuration.
  • the phosphor screen of this new tube is made by a photographic method, using photosensitive resin on the surface of the panel, the above mentioned shadow mask having a plurality of small rectangular beam passable apertures, and using a long light source for projecting bright images of the apertures onto the surface of the panel.
  • the phosphor stripe which is to be formed on the panel surface of the bright image of the apertures must be continuous throughout the vertical length of the screen.
  • the stripes of bright images of the mask apertures produced on the panel as above are sufficiently straight and uniform in width on and near the vertical and horizontal axis of the panel. But, in the corner regions of the panel, the stripes of bright images become considerably zigzagged and ununiform in width. Consequently, phosphor stripes in the corner regions are zigzagged and ununiform in width as shown in FIG. 2, resulting in a decrease in quality of color picture reproduced by the screen.
  • the sufficient beam landing tolerance is required near the corner of the screen. Consequently it is very important to eliminate the ununiformity in width of the color phosphor stripes or the light absorbing stripes near the corner of the screen. It was found that the zigzagged form of the stripe images produced on the corner regions of the panel is due to the angular difference between the tangent face of each mask apertures in the lengthwise direction of the aperture rows and the long axis of the light source. As a result, we have improved the color tube by using the improved shadow mask.
  • in-line gun type color cathode ray tubes of highly improved characteristics can be obtained, the electroluminescent screen having very uniform in width or smooth edged phosphor stripes, electron beam landing tolerance being sufficient over the whole area of the screen, adjustment of the tube being simple and easy, and picture reproduced by the screen being demand of high quality both in colors and whiteness.
  • an object of this invention is to provide an improved in-line gun type color cathode ray tube which employs a striped phosphor screen.
  • Another object of this invention is to provide an improved shadow mask.
  • Another object of this invention is to provide an improved shadow mask in which the slit apertures are arranged in a traversely curved pattern.
  • Another object of this invention is to provide an improved color cathode ray tube which has sufficient beam landing tolerance near the corners of the screen.
  • Still another object of this invention is to provide an improved color cathode ray tube is clear and can be easily adjusted the color purity.
  • FIG. 1 is a fragmentary perspective view of a newly developed color cathode ray tube
  • FIG. 2 is an enlarged rear elevational view of the screen of the tube of FIG. 1;
  • FIG. 3 is a perspective view, partly cut away, of a color cathode ray tube according to this invention.
  • FIG. 4 is a diagrammatic perspective showing useful in explaining the relation between the arrangement of the mask apertures and the long light source according to this invention
  • FIG. 5 is a fragmentary elevational showing the intersection lines on a spherical shadow mask accorcing to FIG. 4',
  • FIG. 6 is a fragmentary elevational showing the arrangement of the mask apertures according to FIG. 5;
  • FIG. 7 is a fragmentary enlarged view of the mask apertures according to another embodiment of this invention.
  • FIG. 3 shows a color cathode ray tube of in-line gun type according to this invention.
  • a rectangular-shaped glass panel 31 has, on the inner surface thereof, an electroluminescent screen 32 comprising alternating light absorbing stripes 33 and elemental color phosphor stripes 34, 35 and 36, as well be described in particular hereinafter, arranged in a outwardly curved pattern in a vertical direction or Y-axis of the tube.
  • a shadow mask 37 of a shape substantially corresponding to the panel is located inside the panel 31.
  • the panel is fixed to a funnel 38 to define an evacuated envelope for the tube.
  • the funnel 38 has, in its neck portion, an electron gun means 39 for emitting three electron beams 40, 41 and 42 arranged in line in a common horizontal plane containing X-axis of the tube. These electron beams are deflected horizontally and vertically by deflection means 43, and are thereby caused to scan a curved spherical screen 32 through a shadow mask 37.
  • the shadow mask 37 has a number of small rectangular apertures 44 which are arranged in rows running generally along the vertical direction or Y-axis of the tube.
  • the apertures 44 in each of the rows are aligned lengthwise, as if a very long continuous opening of the same width as that of the apertures is divided into many apertures by very narrow bridge portions 45 of about 0.1 mm in width, for example.
  • each row of the mask aperture are arranged in parallel to the vertical or Y-axis of the tube over the whole effective area of the shadow mask.
  • the rows of the mask apertures located in the center region of the mask are substantially parallel to the vertical axis of the tube and the remainder of said rows of the mask apertures are traversely curved with a curvature which is gradually increasing outwardly from the center of the mask in horizontal direction or X-axis of the tube.
  • the light absorbing stripes 33 and the elemental color phosphor stripes 34, 35 and 36 are formed by known light printing methods employing a light beam passing through said the shadow mask 37
  • the detailed arrangement of the mask apertures will be hereinbelow discussed with reference to FIG. 4 which shows the relationship between the arranging row of the mask apertures and the long light source for forming the screen.
  • the long light source 46 is positioned at the deflection center'of the electron beams as viewed from the panel in the direction of the central axis or Z-axis of the tube. I To make a striped screen, the panel (not shown) with the shadow mask 37 attached thereon is placed with its inner surface downward on the top of an exposing box (not shown).
  • A-light source having a long slit window 46 is provided on the bottom of the box for projecting light onto the inner surface of the panel through the shadow mask 37.
  • the rectangular apertures of the shadow mask are arranged along the intersection lines 48 which are produced with a flat plane 47 containing a long axis L of the light source 46 with the shadow mask 37
  • FIG. 5 shows the intersection lines 48 as viewed in the direction of the central axis Z of the tube constructed following the directions provided by FIG. 4.
  • the intersection lines 48a produced on and near the Y-axis of the mask are almost straight or parallel to the Y-axis.
  • the intersection lines 48b produced near the corner or far from the Y-axis are curved outwardly in the X-axis direction with gradually increasing curvature because the mask has an outwardly curved spherical face. 7
  • intersection line 48 is an arc of ellipse when viewed from the Z-axis direction is expressed as follows:
  • FIG. 6 shows an arrangement of the apertures 44 of the shadow mask 37 aligned along the intersection lines as explained in FIGS. 4 and 5.
  • the light emitted from the light source is projected on the inner surface of the panel along a flat plane containing the intersection line 48 and said long axis L of the light source as explained in FIG. 4.
  • a striped screen on the panel is made by the light printing method using the above described shadow mask. Therefore, the light absorbing stripes and the elemental color stripes are formed with a pattern corresponding to the intersection lines 48 of the shadow mask in FIG. 6. That is, the stripes are substantially straight on and near the Y-axis of the screen, and are curved gradually increasing in curvature outwardly in the X-axis direction at points removed from the screen center.
  • FIG. 7 shows the another embodiment of the arrangement of the mask-apertures according to this invention.
  • the mask 37 has the very narrow bridge portions 50a, 50b which are substantially parallel to the X-axis of the tube to prevent moire phenomena.
  • the electroluminescent screen has smooth edged continuous color phosphor stripes over the effective area of the screen.
  • a color cathode tube according to this invention has sufficient beam landing tolerance near the corners of the screen and has higher color picture qualities. While in the above described embodiment the color cathode ray tube has a outwardly curved spherical screen and a spherical shadow mask, the configuration of the screen and the mask may vary from spherical to cylindrical.
  • this invention is also applicable to other color cathode ray tube in which the screen has only color phosphor stripes.
  • a color cathode ray tube comprising a curved screen panel having an inner surface with successive groups of three different elemental color vertical phosphor stripes arranged cyclically therein,
  • election gun means arrayed on a plane perpendicular to said phosphor stripes for generating three electron beams directed toward said screen for impinging on corresponding ones of said phosphor stripes,
  • a shadow mask interposed between said gun means and said inner panel surface and having substantially the same curvature as said panel, said mask having vertical rows of beam-passable apertures, said apertures being separated from one another along each row by narrow bridge portions, each of said rows of apertures being associated with one of said groups of phosphor stripes and limiting the illumination thereof by said gun means, said phosphor stripes and associated rows of apertures being substantially straight on and near the vertical axis of the tube as viewed in the direction of the central axis of the tube, and the remainder of said phosphor stripes and associated rows of apertures being outwardly curved in the horizontal axis direction on both sides of the Y-axis of the screen, the color stripes and associated rows of apertures becoming increasingly concave toward the axis of the screen with distance from it.
  • said panel and associated mask are spherical.
  • each of said color 1 phosphor stripes is separated by a light absorbing stripe from the adjacent phosphor stripe.
  • each of said color phosphor stripes is separated by a light absorbing stripe from the adjacent phosphor stripe.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US393028A 1972-08-30 1973-08-30 Color cathode ray tube with phosphor strips concave toward vertical center line Expired - Lifetime US3889145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47086354A JPS5244511B2 (ja) 1972-08-30 1972-08-30

Publications (1)

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US3889145A true US3889145A (en) 1975-06-10

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US393028A Expired - Lifetime US3889145A (en) 1972-08-30 1973-08-30 Color cathode ray tube with phosphor strips concave toward vertical center line

Country Status (8)

Country Link
US (1) US3889145A (ja)
JP (1) JPS5244511B2 (ja)
CA (1) CA1086810A (ja)
DE (1) DE2343777B2 (ja)
FR (1) FR2198259B1 (ja)
GB (1) GB1445619A (ja)
IT (1) IT993840B (ja)
NL (1) NL172704B (ja)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947718A (en) * 1973-03-06 1976-03-30 U.S. Philips Corporation Shadow mask having elongated apertures concave to vertical center line and increasing in pitch along x-axis with distance from said line
US3988777A (en) * 1974-03-13 1976-10-26 Matsushita Electronics Corporation Color picture tube
US4070596A (en) * 1971-08-27 1978-01-24 Tokyo Shibaura Electric Co., Ltd. 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
US4136300A (en) * 1975-03-19 1979-01-23 Rca Corporation Cathode ray tube having improved shadow mask
US4181870A (en) * 1978-03-08 1980-01-01 Zenith Radio Corporation Assembly of electron guns having different gamma values
US4369396A (en) * 1979-06-27 1983-01-18 International Business Machines Corp. Color cathode-ray tube apparatus with shadow mask
DE3430395A1 (de) * 1983-08-19 1985-03-07 Rca Corp., New York, N.Y. Verfahren zur bildschirmherstellung bei schlitzmasken-farbbildroehren mit linienrasterschirm
US4568162A (en) * 1983-08-19 1986-02-04 Rca Corporation Method for screening line screen slit mask color picture tubes
DE3608433A1 (de) * 1985-03-14 1986-09-18 Rca Corp., Princeton, N.J. Farbbildroehre mit verbesserter schattenmaske
US4614893A (en) * 1980-09-30 1986-09-30 U.S. Philips Corporation Color display tube
US4631441A (en) * 1985-03-14 1986-12-23 Rca Corporation Color picture tube having improved line screen
US4634247A (en) * 1985-12-19 1987-01-06 Rca Corporation Method for screening line screen slit mask color picture tubes
US4665339A (en) * 1984-05-25 1987-05-12 Rca Corporation Color picture tube having improved slit column pattern
US4677339A (en) * 1984-09-13 1987-06-30 Kabushiki Kaisha Toshiba Color cathode ray tube
US4691138A (en) * 1985-03-14 1987-09-01 Rca Corporation Color picture tube having shadow mask with varied aperture column spacing
US4697119A (en) * 1985-01-11 1987-09-29 Kabushiki Kaisha Toshiba Color cathode ray tube having a non-spherical curved mask
US5672934A (en) * 1994-07-14 1997-09-30 Kabushiki Kaisha Toshiba Color cathode-ray tube having a shadow mask with improved arrays of apertures

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6024533B2 (ja) * 1973-12-10 1985-06-13 日本電気株式会社 シヤドウマスクの製造方法
CA1065003A (en) * 1975-05-05 1979-10-23 Albert M. Morrell Cathode ray tube having improved line-screen structure
JPS5224073A (en) * 1975-07-15 1977-02-23 Nec Corp Color braun tube use shadow mask plate
NL7602752A (nl) * 1976-03-17 1977-09-20 Philips Nv Belichtingsinrichting voor het vervaardigen van beeldschermen van kleurentelevisiebeeldbuizen en beeldbuis vervaardigd met een dergelijke inrich- ting.
JPS5310961A (en) * 1976-07-19 1978-01-31 Hitachi Ltd Color picture tube
DE2656995C2 (de) * 1976-12-16 1983-12-01 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Rechteckförmige Farbwahlmaske für eine Farbbildkathodenstrahlröhre
NL7703233A (nl) * 1977-03-25 1978-09-27 Philips Nv Televisieweergeefbuis.
NL7711713A (nl) * 1977-10-26 1979-05-01 Philips Nv Kleurenbeeldbuis.
DE2833092A1 (de) * 1978-07-28 1980-02-07 Licentia Gmbh Farbbildkathodenstrahlroehre und verfahren zu deren herstellung
JPS644793Y2 (ja) * 1984-10-12 1989-02-07

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2842697A (en) * 1955-12-07 1958-07-08 Philco Corp Beam-intercepting structure for cathode ray tube
US3247412A (en) * 1961-03-08 1966-04-19 Philips Corp Color television tube screen having strip interruptions for reducing perceptibleness of stripe structure
US3790839A (en) * 1972-04-04 1974-02-05 Zenith Radio Corp Rectangular grade black surround screen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA921540A (en) * 1968-11-21 1973-02-20 Fuse Yuzo Shadow mask

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2842697A (en) * 1955-12-07 1958-07-08 Philco Corp Beam-intercepting structure for cathode ray tube
US3247412A (en) * 1961-03-08 1966-04-19 Philips Corp Color television tube screen having strip interruptions for reducing perceptibleness of stripe structure
US3790839A (en) * 1972-04-04 1974-02-05 Zenith Radio Corp Rectangular grade black surround screen

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070596A (en) * 1971-08-27 1978-01-24 Tokyo Shibaura Electric Co., Ltd. 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
US3947718A (en) * 1973-03-06 1976-03-30 U.S. Philips Corporation Shadow mask having elongated apertures concave to vertical center line and increasing in pitch along x-axis with distance from said line
US3988777A (en) * 1974-03-13 1976-10-26 Matsushita Electronics Corporation Color picture tube
US4136300A (en) * 1975-03-19 1979-01-23 Rca Corporation Cathode ray tube having improved shadow mask
US4181870A (en) * 1978-03-08 1980-01-01 Zenith Radio Corporation Assembly of electron guns having different gamma values
US4369396A (en) * 1979-06-27 1983-01-18 International Business Machines Corp. Color cathode-ray tube apparatus with shadow mask
US4614893A (en) * 1980-09-30 1986-09-30 U.S. Philips Corporation Color display tube
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
DE3430395A1 (de) * 1983-08-19 1985-03-07 Rca Corp., New York, N.Y. Verfahren zur bildschirmherstellung bei schlitzmasken-farbbildroehren mit linienrasterschirm
US4665339A (en) * 1984-05-25 1987-05-12 Rca Corporation Color picture tube having improved slit column pattern
US4677339A (en) * 1984-09-13 1987-06-30 Kabushiki Kaisha Toshiba Color cathode ray tube
US4697119A (en) * 1985-01-11 1987-09-29 Kabushiki Kaisha Toshiba Color cathode ray tube having a non-spherical curved mask
US4631441A (en) * 1985-03-14 1986-12-23 Rca Corporation Color picture tube having improved line screen
GB2175132A (en) * 1985-03-14 1986-11-19 Rca Corp Color picture tube shadow mask
DE3608433A1 (de) * 1985-03-14 1986-09-18 Rca Corp., Princeton, N.J. Farbbildroehre mit verbesserter schattenmaske
US4691138A (en) * 1985-03-14 1987-09-01 Rca Corporation Color picture tube having shadow mask with varied aperture column spacing
GB2175132B (en) * 1985-03-14 1989-06-21 Rca Corp Color picture tube having improved shadow mask
US4634247A (en) * 1985-12-19 1987-01-06 Rca Corporation Method for screening line screen slit mask color picture tubes
DE3643113A1 (de) * 1985-12-19 1987-06-25 Rca Corp Verfahren zur herstellung eines linienrasterschirms einer schlitzmasken-farbbildroehre
US5672934A (en) * 1994-07-14 1997-09-30 Kabushiki Kaisha Toshiba Color cathode-ray tube having a shadow mask with improved arrays of apertures

Also Published As

Publication number Publication date
NL172704B (nl) 1983-05-02
GB1445619A (en) 1976-08-11
NL7311931A (ja) 1974-03-04
DE2343777B2 (de) 1976-12-02
FR2198259A1 (ja) 1974-03-29
JPS4943568A (ja) 1974-04-24
DE2343777A1 (de) 1974-03-14
FR2198259B1 (ja) 1977-08-05
CA1086810A (en) 1980-09-30
IT993840B (it) 1975-09-30
JPS5244511B2 (ja) 1977-11-08

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