US3883770A - Colour picture tubes - Google Patents

Colour picture tubes Download PDF

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Publication number
US3883770A
US3883770A US321019A US32101973A US3883770A US 3883770 A US3883770 A US 3883770A US 321019 A US321019 A US 321019A US 32101973 A US32101973 A US 32101973A US 3883770 A US3883770 A US 3883770A
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Prior art keywords
colour
bridges
picture tube
stripe shaped
selecting member
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Expired - Lifetime
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US321019A
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Junichi Yamada
Etuzo Terashima
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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
    • 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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C9/00—Electrically-actuated devices for setting the time-indicating means

Definitions

  • a colour picture tube comprising a colour selecting member provided with a plurality of stripe shaped parallel perforations extending in the direction of vertical or horizontal deflection, a fluorescent screen including a plurality of stripe shaped phosphors corresponding to the stripe shaped perforations, and an electron gun, each stripe shaped perforation is divided into a plurality of slit shaped sections by means of spaced apart lateral bridges and the height of the bridges is made smaller than the thickness of the colour selecting member so that adjacent sections are separated by the bridges on the side facing to the electron gun assembly whereas they merge with each other on the side facing to the fluorescent screen.
  • This invention relates to a colour picture tube, more particularly to a colour picture tube utilizing a colour selecting member or electrode provided with a plurality of stripe shaped perforations.
  • colour picture tubes With a widespread use of colour television receivers in recent years, various types of colour picture tubes have been developed including the colour picture tube utilizing a colour selecting member or electrode (called hereinafter a colour selecting member) having a plurality of stripe shaped perforations described above. Since the colour picture tube of this type does not require any adjustment of the electron beam or electron gun in one direction, typically in the vertical direction, it is possible to produce pictures of higher colour purity than the colour picture tube utilizing a shadow mask of well known construction with a more simple electronic circuit.
  • a colour selecting member a colour selecting member having a plurality of stripe shaped perforations described above. Since the colour picture tube of this type does not require any adjustment of the electron beam or electron gun in one direction, typically in the vertical direction, it is possible to produce pictures of higher colour purity than the colour picture tube utilizing a shadow mask of well known construction with a more simple electronic circuit.
  • the colour selecting member tends to vibrate in response to mechanical shocks or large audio volume raised by a speaker incorporated in a colour television receiver during the operation of the colour picture tube.
  • fine metal wires for example steel wires
  • the stripe shaped perforations divided with said steel wires are deformed so that this method can not be applied to a spherical colour selecting member.
  • bridges which are suitably spaced apart in the longitudinal direction of the stripe shaped perforations of the colour selecting member are provided to traverse the perforations which are extending in the direction of the vertical deflection for reinforcing the colour selecting member, as disclosed in the specifications of a I-Iaan et al US. Pat. No. 3,186,884 dated June I, 1965 (US. patent application Ser. No. 126360, filed May 2, 1960).
  • Another object of this invention is to provide a new and improved colour picture tube provided with stripe shaped phosphors on the inner side of the face plate which are continuous between the opposite ends and wherein the halation caused by the electron beam is minimized.
  • a further object of this invention is to provide an improved colour selecting electrode which has sufficiently large mechanical strength and can form uniform and continuous stripes of phosphors on the fluorescent screen of a colour picture tube.
  • a colour picture tube comprising a colour selecting member provided with a plurality of stripe shaped parallel perforations extending in a direction parallel to one side of the picture displayed by the tube, each stripe shaped perforation being divided into a plurality of slit shaped sections by means of spaced apart bridges extending in a direction perpendicular to the first mentioned direction, a fluorescent screen including a plurality of stripe shaped phosphors corresponding to the stripe shaped perforations, and an electron gun assembly, characterized in that the height of the bridges is made smaller than the thickness of the colour selecting member so that adjacent sections are separated by the bridge on the side facing to the electron gun assembly whereas they merge with each other on the side facing to the fluorescent screen.
  • FIG. 1 is an enlarged plan view of a portion of one example of a colour selecting member utilized in the colour picture tube of this invention
  • FIG. 2 is an enlarged plan view of a portion of a modified colour selecting member utilized in the colour picture tube of this invention
  • FIG. 3 shows a cross section of the colour selecting member shown in FIG. 1 taken along a line III-III;
  • FIG. 4 shows a cross section of the colour selecting member shown in FIG. 1 taken along a line lV-IV;
  • FIG. 5 shows a sectional view corresponding to FIG. 3 of another modification of the colour selecting member.
  • the colour selecting member 1 shown therein comprises a plurality of spaced apart parallel rows of stripe shaped perforations 2, each being divided by transverse bridges 3 into a plurality of slit shaped sections 2a.
  • the bridges 3 in each stripe shaped perforation 2 are spaced apart in the longitudinal direction of the perforation.
  • the height of each bridge 3 is smaller than the thickness of the colour selecting member 1 so that the opening 2b of each section 2a facing toward the electron gun assembly is smaller than the opening 2c on the side facing the fluorescent screen. In other words, adjacent openings 2c merge with each other to form a single opening.
  • each bridge may be equal to or smaller or larger than one half of the thickness of the colour selecting member.
  • Such bridges of reduced height can be prepared by etching such that the portions of the bridges 3 facing to the fluorescent screen are removed completely, whereas the portions of the bridges on the side facing to the electron gun assembly are not etched.
  • a steel sheet having a thickness of about 0.15 mm was etched from the side of the fluorescent screen to form stripe shaped perforations at a pitch of 0.6 mm with bridges spaced apart 1 mm.
  • the width of the sections of the stripe shaped perforations was 0.14 mm on the side facing to the electron gun assembly and 0.3 mm on the side facing to the fluorescent screen, and the width of the bridges was 0.05 mm on the side facing to the electron gun assembly.
  • the height of the bridges was 0.06 mm.
  • the bridges of respective stripe shaped perforations were aligned in the horizontal direction
  • the bridges 3 are not aligned in the horizontal direction but staggered. This arrangement of the bridges increases the mechanical strength of the colour selecting member beyond that of the first embodiment.
  • the bridges may protrude slightly beyond the surface of the colour selecting member on the side thereof facing to the electron gun assembly.
  • the stripe shaped perforations were shown as extending in the direction of vertical deflection it will be clear that the perforations may extend in the direction of horizontal deflection.
  • the colour selecting member of this invention it is possible not only to form continuous and uniform stripes of phosphors on the inner surface of the colour picture tube but also to decrease the halation caused by the electron beam reflected by the side walls of the bridges. Moreover, as it is possible to increase the resistance of the colour selecting member against mechanical shocks and vibrations the colour picture tube can reproduce stably pictures of high colour purities.
  • a color picture tube comprising a colour selecting member provided with a plurality of stripe shaped parallel perforations extending in a direction parallel to one side of the picture displayed by said tube, each stripe shaped perforation being divided into a plurality of slit shaped sections by means of spaced apart bridges extending across said perforation in a direction perpendicular to said first mentioned direction, a fluorescent screen including a plurality of stripe shaped phosphors corresponding to said stripe shaped perforations, and an electron gun assembly, the improvement wherein the height of said bridges is made approximately onehalf the thickness of said colour selecting member so that adjacent said slit shaped sections are separated by said bridges on the side facing to said electron gun assembly whereas they merge with each other on the side facing to said fluorescent screen to form said perforation as continuous stripe shaped openings.

Abstract

In a colour picture tube comprising a colour selecting member provided with a plurality of stripe shaped parallel perforations extending in the direction of vertical or horizontal deflection, a fluorescent screen including a plurality of stripe shaped phosphors corresponding to the stripe shaped perforations, and an electron gun, each stripe shaped perforation is divided into a plurality of slit shaped sections by means of spaced apart lateral bridges and the height of the bridges is made smaller than the thickness of the colour selecting member so that adjacent sections are separated by the bridges on the side facing to the electron gun assembly whereas they merge with each other on the side facing to the fluorescent screen.

Description

Yamada et al.
[ COLOUR PICTURE TUBES [75] Inventors: Junichi Yamada; Etuzo Terashima,
both of Mobara-City, Japan [73] Assignee: Hitachi, Ltd., Tokyo, Japan [22] Filed: Jan. 4, 1973 [21] Appl. No.: 321,019
[30] Foreign Application Priority Data Jan. 19, 1972 Japan 47-008061 [52] US. Cl. 313/403 [51] Int. Cl. H01j 29/06 [58] Field of Search 313/85 S, 403, 408
[56] References Cited UNITED STATES PATENTS 2,690,518 9/1954 Fyler et al 313/408 3,663,854 5/1972 Tsuneta et al 313/85 S 3,666,462 5/1972 Kaplan 313/85 S 3,760,214 9/1973 Yamasaki et a1. 313/858 [451 May 13,1975
Primary Examiner-Ronald L. Wibert Assistant ExaminerRichard A. Rosenberger Attorney, Agent, or FirmDike, Bronstein, Roberts, Cushman and Pfund [57] ABSTRACT In a colour picture tube comprising a colour selecting member provided with a plurality of stripe shaped parallel perforations extending in the direction of vertical or horizontal deflection, a fluorescent screen including a plurality of stripe shaped phosphors corresponding to the stripe shaped perforations, and an electron gun, each stripe shaped perforation is divided into a plurality of slit shaped sections by means of spaced apart lateral bridges and the height of the bridges is made smaller than the thickness of the colour selecting member so that adjacent sections are separated by the bridges on the side facing to the electron gun assembly whereas they merge with each other on the side facing to the fluorescent screen.
10 Claims, 5 Drawing Figures PATENTED HAY I 3 I975 SHEET 2 OF 2 COLOUR PICTURE TUBES BACKGROUND OF THE INVENTION This invention relates to a colour picture tube, more particularly to a colour picture tube utilizing a colour selecting member or electrode provided with a plurality of stripe shaped perforations.
With a widespread use of colour television receivers in recent years, various types of colour picture tubes have been developed including the colour picture tube utilizing a colour selecting member or electrode (called hereinafter a colour selecting member) having a plurality of stripe shaped perforations described above. Since the colour picture tube of this type does not require any adjustment of the electron beam or electron gun in one direction, typically in the vertical direction, it is possible to produce pictures of higher colour purity than the colour picture tube utilizing a shadow mask of well known construction with a more simple electronic circuit. In this type of the colour picture tube, however, as a plurality of stripe shaped perforations are formed in the colour selecting member to extend substantially the entire vertical or horizontal width thereof, the colour selecting member tends to vibrate in response to mechanical shocks or large audio volume raised by a speaker incorporated in a colour television receiver during the operation of the colour picture tube.
According to one approach developed for solving these problems, fine metal wires, for example steel wires, are provided across the stripe shaped perforations, the wires being spaced apart in the longitudinal direction of the perforations. However, as it is necessary to secure the steel wires to the colour selecting member by means of spot welding for example, the stripe shaped perforations divided with said steel wires are deformed so that this method can not be applied to a spherical colour selecting member.
According to another approach, bridges which are suitably spaced apart in the longitudinal direction of the stripe shaped perforations of the colour selecting member are provided to traverse the perforations which are extending in the direction of the vertical deflection for reinforcing the colour selecting member, as disclosed in the specifications of a I-Iaan et al US. Pat. No. 3,186,884 dated June I, 1965 (US. patent application Ser. No. 126360, filed May 2, 1960). When photosensitive material coated on the inner surface of the face plate of a colour picture tube is exposed to light transmitting through a colour selecting member of this construction to form stripe shaped phosphors, the portions of the photosensitive material corresponding to the bridges are not sufficiently exposed thereby causing uneven exposure which decreases the quality of the reproduced picture. Moreover, the electron beam emanated from an electron gun is reflected by the side walls of the bridges to cause halation.
SUMMARY OF THE INVENTION It is an object of this invention to provide an improved colour picture tube which does not require any adjustment of the picture in the vertical or horizontal direction and yet can produce stable pictures of high colour purities.
Another object of this invention is to provide a new and improved colour picture tube provided with stripe shaped phosphors on the inner side of the face plate which are continuous between the opposite ends and wherein the halation caused by the electron beam is minimized.
A further object of this invention is to provide an improved colour selecting electrode which has sufficiently large mechanical strength and can form uniform and continuous stripes of phosphors on the fluorescent screen of a colour picture tube.
In accordance with this invention, there is provided a colour picture tube comprising a colour selecting member provided with a plurality of stripe shaped parallel perforations extending in a direction parallel to one side of the picture displayed by the tube, each stripe shaped perforation being divided into a plurality of slit shaped sections by means of spaced apart bridges extending in a direction perpendicular to the first mentioned direction, a fluorescent screen including a plurality of stripe shaped phosphors corresponding to the stripe shaped perforations, and an electron gun assembly, characterized in that the height of the bridges is made smaller than the thickness of the colour selecting member so that adjacent sections are separated by the bridge on the side facing to the electron gun assembly whereas they merge with each other on the side facing to the fluorescent screen.
BRIEF DESCRIPTION OF THE DRAWINGS This invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is an enlarged plan view ofa portion of one example of a colour selecting member utilized in the colour picture tube of this invention;
FIG. 2 is an enlarged plan view ofa portion ofa modified colour selecting member utilized in the colour picture tube of this invention;
FIG. 3 shows a cross section of the colour selecting member shown in FIG. 1 taken along a line III-III;
FIG. 4 shows a cross section of the colour selecting member shown in FIG. 1 taken along a line lV-IV; and
FIG. 5 shows a sectional view corresponding to FIG. 3 of another modification of the colour selecting member.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIGS. 1, 3 and 4 of the accompanying drawing, the colour selecting member 1 shown therein comprises a plurality of spaced apart parallel rows of stripe shaped perforations 2, each being divided by transverse bridges 3 into a plurality of slit shaped sections 2a. The bridges 3 in each stripe shaped perforation 2 are spaced apart in the longitudinal direction of the perforation. As shown in FIG. 3, the height of each bridge 3 is smaller than the thickness of the colour selecting member 1 so that the opening 2b of each section 2a facing toward the electron gun assembly is smaller than the opening 2c on the side facing the fluorescent screen. In other words, adjacent openings 2c merge with each other to form a single opening. The height of each bridge may be equal to or smaller or larger than one half of the thickness of the colour selecting member. Such bridges of reduced height can be prepared by etching such that the portions of the bridges 3 facing to the fluorescent screen are removed completely, whereas the portions of the bridges on the side facing to the electron gun assembly are not etched.
For this reason, when the photosensitive material coated on the inner surface of the face plate is exposed to light transmitting through the stripe shaped perforations 2, portions of the photosensitive material corresponding to the bridges are also irradiated sufficiently because the exposure light 4 transmits obliquely through respective sections 2a of the stripe shaped perforations 2 as shown in FIG. 3. This advantage is provided by the decreased height and tapered construction of the bridges. The height of the bridges is determined by taking into consideration the degree of reinforcement of the colour selecting member and the degree of removal of the halation.
In one example, a steel sheet having a thickness of about 0.15 mm was etched from the side of the fluorescent screen to form stripe shaped perforations at a pitch of 0.6 mm with bridges spaced apart 1 mm. The width of the sections of the stripe shaped perforations was 0.14 mm on the side facing to the electron gun assembly and 0.3 mm on the side facing to the fluorescent screen, and the width of the bridges was 0.05 mm on the side facing to the electron gun assembly. The height of the bridges was 0.06 mm.
Although in the embodiment described above, the bridges of respective stripe shaped perforations were aligned in the horizontal direction, in the modification shown in FIG. 2, the bridges 3 are not aligned in the horizontal direction but staggered. This arrangement of the bridges increases the mechanical strength of the colour selecting member beyond that of the first embodiment.
As shown in FIG. 5, the bridges may protrude slightly beyond the surface of the colour selecting member on the side thereof facing to the electron gun assembly.
Although in the foregoing embodiments, the stripe shaped perforations were shown as extending in the direction of vertical deflection it will be clear that the perforations may extend in the direction of horizontal deflection.
As above described, with the colour selecting member of this invention it is possible not only to form continuous and uniform stripes of phosphors on the inner surface of the colour picture tube but also to decrease the halation caused by the electron beam reflected by the side walls of the bridges. Moreover, as it is possible to increase the resistance of the colour selecting member against mechanical shocks and vibrations the colour picture tube can reproduce stably pictures of high colour purities.
What is claimed is:
1. In a color picture tube comprising a colour selecting member provided with a plurality of stripe shaped parallel perforations extending in a direction parallel to one side of the picture displayed by said tube, each stripe shaped perforation being divided into a plurality of slit shaped sections by means of spaced apart bridges extending across said perforation in a direction perpendicular to said first mentioned direction, a fluorescent screen including a plurality of stripe shaped phosphors corresponding to said stripe shaped perforations, and an electron gun assembly, the improvement wherein the height of said bridges is made approximately onehalf the thickness of said colour selecting member so that adjacent said slit shaped sections are separated by said bridges on the side facing to said electron gun assembly whereas they merge with each other on the side facing to said fluorescent screen to form said perforation as continuous stripe shaped openings.
2. The colour picture tube according to claim 1 wherein said stripe shaped perforations extend in the direction of vertical deflection.
3. The colour picture tube according to claim 1 wherein said stripe shaped perforations extend in the direction of horizontal deflection.
4. The colour picture tube according to claim 1 wherein the cross-sectional area of each bridge decreases gradually from the side thereof facing to said electron gun assembly toward said fluoroscent screen.
5. The colour picture tube according to claim 1 wherein the height of said bridges is larger than one half of the thickness of said colour selecting member.
6. The colour picture tube according to claim 1 wherein the height of said bridges is substantially equal to one half of the thickness of said colour selecting member.
7. The colour picture tube according to claim 1 wherein the height of said bridges is smaller than one half of the thickness of said colour selecting member.
8. The colour picture tube according to claim 1 wherein said bridges of said stripe shaped perforations are aligned in said first mentioned direction.
9. The colour picture tube according to claim 1 wherein said bridges of said stripe shaped perforations are staggered in said first mentioned direction.
10. The colour picture tube according to claim 1 wherein said bridges protrude slightly beyond the surface of said colour selecting member on the side thereof facing to said electron gun assembly.

Claims (10)

1. In a color picture tube comprising a colour selecting member provided with a plurality of stripe shaped parallel perforations extending in a direction parallel to one side of the picture displayed by said tube, each stripe shaped perforation being divided into a plurality of slit shaped sections by means of spaced apart bridges extending across said perforation in a direction perpendicular to said first mentioned direction, a fluorescent screen including a plurality of stripe shaped phosphors corresponding to said stripe shaped perforations, and an electron gun assembly, the improvement wherein the height of said bridges is made approximately one-half the thickness of said colour selecting member so that adjacent said slit shaped sections are separated by said bridges on the side facing to said electron gun assembly whereas they merge with each other on the side facing to said fluorescent screen to form said perforation as continuous stripe shaped openings.
2. The colour picture tube according to claim 1 wherein said stripe shaped perforations extend in the direction of vertical deflection.
3. The colour picture tube according to claim 1 wherein said stripe shaped perforations extend in the direction of horizontal deflection.
4. The colour picture tube according to claim 1 wherein the cross-sectional area of each bridge decreases gradually from the side thereof facing to said electron gun assembly toward said fluoroscent screen.
5. The colour picture tube according to claim 1 wherein the height of saId bridges is larger than one half of the thickness of said colour selecting member.
6. The colour picture tube according to claim 1 wherein the height of said bridges is substantially equal to one half of the thickness of said colour selecting member.
7. The colour picture tube according to claim 1 wherein the height of said bridges is smaller than one half of the thickness of said colour selecting member.
8. The colour picture tube according to claim 1 wherein said bridges of said stripe shaped perforations are aligned in said first mentioned direction.
9. The colour picture tube according to claim 1 wherein said bridges of said stripe shaped perforations are staggered in said first mentioned direction.
10. The colour picture tube according to claim 1 wherein said bridges protrude slightly beyond the surface of said colour selecting member on the side thereof facing to said electron gun assembly.
US321019A 1972-01-19 1973-01-04 Colour picture tubes Expired - Lifetime US3883770A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293792A (en) * 1979-12-18 1981-10-06 Rca Corporation Color picture tube having improved slit type shadow 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
US4300069A (en) * 1979-12-18 1981-11-10 Rca Corporation Color picture tube having improved slit type shadow mask and method of making same
US4389592A (en) * 1980-05-12 1983-06-21 Buckbee-Mears Company Color picture tube and aperture mask therefor
US4518892A (en) * 1980-05-12 1985-05-21 Buckbee Mears Company Television picture tube with aperture mask having recesses therein
US4632726A (en) * 1984-07-13 1986-12-30 Bmc Industries, Inc. Multi-graded aperture mask method
WO2003049137A2 (en) * 2001-11-30 2003-06-12 Bmc Industries, Inc. Tie bars only on the grade side of aperture masks
US20030143469A1 (en) * 2001-11-30 2003-07-31 Sage Thomas R. Grade tie bar only (GTO) and graded grade tie bar only (GGTO) aperture masks
US6674223B2 (en) * 1999-11-30 2004-01-06 Lg Electronics Inc. Mask in color cathode ray tube
US6762545B2 (en) * 2000-04-20 2004-07-13 Samsung Sdi Co., Ltd. Tension mask for color CRT, method for manufacturing the tension mask, and exposure mask used in the manufacture of the tension mask
US6803711B2 (en) * 2000-09-01 2004-10-12 Samsung Sdi Co., Ltd. Mask for color cathode ray tube having beneficial slot and bridge configurations, manufacturing method thereof, and exposure mask for manufacturing the mask

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
US3663854A (en) * 1969-02-17 1972-05-16 Tokyo Shibaura Electric Co Shadow-mask having rectangular apertures
US3666462A (en) * 1969-03-28 1972-05-30 Zenith Radio Corp Process of screening a shadow mask color tube
US3760214A (en) * 1971-12-30 1973-09-18 Hitachi Ltd Shadow masks for use in colour picture tubes

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
US3663854A (en) * 1969-02-17 1972-05-16 Tokyo Shibaura Electric Co Shadow-mask having rectangular apertures
US3666462A (en) * 1969-03-28 1972-05-30 Zenith Radio Corp Process of screening a shadow mask color tube
US3760214A (en) * 1971-12-30 1973-09-18 Hitachi Ltd Shadow masks for use in colour picture tubes

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4296189A (en) * 1979-05-24 1981-10-20 Rca Corporation Color picture tube having improved slit type shadow mask and method of making same
US4293792A (en) * 1979-12-18 1981-10-06 Rca Corporation Color picture tube having improved slit type shadow mask
US4300069A (en) * 1979-12-18 1981-11-10 Rca Corporation Color picture tube having improved slit type shadow mask and method of making same
US4389592A (en) * 1980-05-12 1983-06-21 Buckbee-Mears Company Color picture tube and aperture mask therefor
US4518892A (en) * 1980-05-12 1985-05-21 Buckbee Mears Company Television picture tube with aperture mask having recesses therein
US4632726A (en) * 1984-07-13 1986-12-30 Bmc Industries, Inc. Multi-graded aperture mask method
US6674223B2 (en) * 1999-11-30 2004-01-06 Lg Electronics Inc. Mask in color cathode ray tube
US6762545B2 (en) * 2000-04-20 2004-07-13 Samsung Sdi Co., Ltd. Tension mask for color CRT, method for manufacturing the tension mask, and exposure mask used in the manufacture of the tension mask
US6803711B2 (en) * 2000-09-01 2004-10-12 Samsung Sdi Co., Ltd. Mask for color cathode ray tube having beneficial slot and bridge configurations, manufacturing method thereof, and exposure mask for manufacturing the mask
WO2003049137A2 (en) * 2001-11-30 2003-06-12 Bmc Industries, Inc. Tie bars only on the grade side of aperture masks
US20030143469A1 (en) * 2001-11-30 2003-07-31 Sage Thomas R. Grade tie bar only (GTO) and graded grade tie bar only (GGTO) aperture masks
WO2003049137A3 (en) * 2001-11-30 2004-02-26 Bmc Ind Inc Tie bars only on the grade side of aperture masks

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Publication number Publication date
FR2168383A1 (en) 1973-08-31
FR2168383B1 (en) 1978-05-19
GB1388091A (en) 1975-03-19
JPS513733Y2 (en) 1976-02-03
JPS4885555U (en) 1973-10-17
DE2302177B2 (en) 1975-06-26
DE2302177A1 (en) 1973-07-26

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