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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US
United States
Prior art keywords
colour
bridges
picture tube
stripe shaped
selecting member
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
US321019A
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English (en)
Inventor
Junichi Yamada
Etuzo Terashima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Application granted granted Critical
Publication of US3883770A publication Critical patent/US3883770A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US321019A 1972-01-19 1973-01-04 Colour picture tubes Expired - Lifetime US3883770A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972008061U JPS513733Y2 (enrdf_load_stackoverflow) 1972-01-19 1972-01-19

Publications (1)

Publication Number Publication Date
US3883770A true US3883770A (en) 1975-05-13

Family

ID=11682813

Family Applications (1)

Application Number Title Priority Date Filing Date
US321019A Expired - Lifetime US3883770A (en) 1972-01-19 1973-01-04 Colour picture tubes

Country Status (4)

Country Link
US (1) US3883770A (enrdf_load_stackoverflow)
JP (1) JPS513733Y2 (enrdf_load_stackoverflow)
FR (1) FR2168383B1 (enrdf_load_stackoverflow)
GB (1) GB1388091A (enrdf_load_stackoverflow)

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
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
WO2003049137A3 (en) * 2001-11-30 2004-02-26 Bmc Ind Inc Tie bars only on the grade side of aperture masks
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 (11)

* 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
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

Also Published As

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

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