GB2020892A - C.R.T. Silt Type Shadow Mask - Google Patents

C.R.T. Silt Type Shadow Mask

Info

Publication number
GB2020892A
GB2020892A GB7912618A GB7912618A GB2020892A GB 2020892 A GB2020892 A GB 2020892A GB 7912618 A GB7912618 A GB 7912618A GB 7912618 A GB7912618 A GB 7912618A GB 2020892 A GB2020892 A GB 2020892A
Authority
GB
United Kingdom
Prior art keywords
mask
electron beam
webs
slit
web
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.)
Withdrawn
Application number
GB7912618A
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 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
Publication of GB2020892A publication Critical patent/GB2020892A/en
Withdrawn legal-status Critical Current

Links

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

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

In a color picture tube having a slit type apertured mask the slits in which are arranged in columns with the slits each column separated by webs 46, an improvement is made in web cross-section to increase electron beam transmission and to increase transmission uniformity. Specifically, the web walls on at least one side of the webs are angled generally parallel to the direction of electron beam incidence. Because of this angling, the slope of the walls relative to a surface of the mask on at least the side of the webs facing a central horizontal axis of the mask changes with changes in distance from the central horizontal axis of the mask. All portions of the slit throats (namely in each slit the most restricted opening permitting passage of an electron beam) are closer to one surface of the mask than to the center of the mask thickness dimension. This reduces the sensitivity to etching of the effective web dimension in the direction of the aperture columns. Fabrication may be by the combination of photoresist and etching techniques. <IMAGE>
GB7912618A 1978-05-10 1979-04-10 C.R.T. Silt Type Shadow Mask Withdrawn GB2020892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US90454378A 1978-05-10 1978-05-10

Publications (1)

Publication Number Publication Date
GB2020892A true GB2020892A (en) 1979-11-21

Family

ID=25419335

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7912618A Withdrawn GB2020892A (en) 1978-05-10 1979-04-10 C.R.T. Silt Type Shadow Mask

Country Status (9)

Country Link
JP (1) JPS54147775A (en)
BR (1) BR7902434A (en)
DD (1) DD144621A5 (en)
DE (1) DE2914839A1 (en)
FI (1) FI791257A (en)
FR (1) FR2425717A1 (en)
GB (1) GB2020892A (en)
IT (1) IT1112302B (en)
PL (1) PL215496A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472261A1 (en) * 1979-12-18 1981-06-26 Rca Corp COLOR IMAGE TUBE HAVING A SLIT SHADOW MASK
EP0039906A2 (en) * 1980-05-12 1981-11-18 BMC Industries, Inc. Aperture mask for a color television tube, color television tube comprising such a mask and method for obtaining the mask
US4632726A (en) * 1984-07-13 1986-12-30 Bmc Industries, Inc. Multi-graded aperture mask method
EP0684626A1 (en) * 1994-05-27 1995-11-29 Kabushiki Kaisha Toshiba Color cathode ray tube and method of manufacturing shadow mask
US5730887A (en) * 1994-10-14 1998-03-24 Thomson Consumer Electronics, Inc. Display apparatus having enhanced resolution shadow mask and method of making same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906611C2 (en) * 1979-02-21 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method of manufacturing a color selection mask for a color cathode ray tube
JPS577041A (en) * 1980-05-12 1982-01-14 Buckbee Mears Co Structure with visual sense opening line and method of manufacturing same
US4429028A (en) * 1982-06-22 1984-01-31 Rca Corporation Color picture tube having improved slit type shadow mask and method of making same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472261A1 (en) * 1979-12-18 1981-06-26 Rca Corp COLOR IMAGE TUBE HAVING A SLIT SHADOW MASK
EP0039906A2 (en) * 1980-05-12 1981-11-18 BMC Industries, Inc. Aperture mask for a color television tube, color television tube comprising such a mask and method for obtaining the mask
EP0039906A3 (en) * 1980-05-12 1982-06-16 Buckbee-Mears Company Television picture tubes and hole technology
US4632726A (en) * 1984-07-13 1986-12-30 Bmc Industries, Inc. Multi-graded aperture mask method
EP0684626A1 (en) * 1994-05-27 1995-11-29 Kabushiki Kaisha Toshiba Color cathode ray tube and method of manufacturing shadow mask
US5592044A (en) * 1994-05-27 1997-01-07 Kabushiki Kaisha Toshiba Color cathode ray tube and method of manufacturing shadow mask
US5830373A (en) * 1994-05-27 1998-11-03 Kabushiki Kaisha Toshiba Color cathode ray tube and method of manufacturing shadow mask
US5730887A (en) * 1994-10-14 1998-03-24 Thomson Consumer Electronics, Inc. Display apparatus having enhanced resolution shadow mask and method of making same

Also Published As

Publication number Publication date
PL215496A1 (en) 1980-03-24
DE2914839A1 (en) 1979-11-15
DD144621A5 (en) 1980-10-22
JPS54147775A (en) 1979-11-19
FR2425717A1 (en) 1979-12-07
IT7921930A0 (en) 1979-04-17
IT1112302B (en) 1986-01-13
BR7902434A (en) 1979-12-11
FI791257A (en) 1979-11-11

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)