JPS54137271A - Manufacture of shadow mask - Google Patents

Manufacture of shadow mask

Info

Publication number
JPS54137271A
JPS54137271A JP4426978A JP4426978A JPS54137271A JP S54137271 A JPS54137271 A JP S54137271A JP 4426978 A JP4426978 A JP 4426978A JP 4426978 A JP4426978 A JP 4426978A JP S54137271 A JPS54137271 A JP S54137271A
Authority
JP
Japan
Prior art keywords
corner
dot
matching line
minor
transmission hole
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.)
Granted
Application number
JP4426978A
Other languages
Japanese (ja)
Other versions
JPS6011419B2 (en
Inventor
Makoto Kudo
Yasushi Sengoku
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP4426978A priority Critical patent/JPS6011419B2/en
Publication of JPS54137271A publication Critical patent/JPS54137271A/en
Publication of JPS6011419B2 publication Critical patent/JPS6011419B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

PURPOSE: To secure an easy formation of the electron beam transmission hole similar to a rectangle by carrying out the photo etching via the dot film to which the dots with corner part protruded in the acute angle are provided.
CONSTITUTION: Non-light transmissible dot 12 is provided to panel-type transparent base 11 in nearly rectangular form and in the longer-side direction via transparent bridge part 13, and adjacent to the next dot 12 at the apex of corner 14 of the acute-angle triangle. The minor dot film is as conventional to form the shadow mask. With this mask 4, groove 17 is caused across bridge part 16 in correspondence to corner 14 of the dot, and center 16c of the bridge matching line is positioned between major dot side surface 16a and minor dot side surface 16b. And corner 16d of the matching line is cut toward groove 17, and slit matching line 15c is viewed at the corner of beam transmission hole 15 which is extremely approximate to a rectangule. Furthermore, the luminance of the screen is increased since the beam coming in obliquely is not cut off by the corner.
COPYRIGHT: (C)1979,JPO&Japio
JP4426978A 1978-04-17 1978-04-17 How to make a shadow mask Expired JPS6011419B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4426978A JPS6011419B2 (en) 1978-04-17 1978-04-17 How to make a shadow mask

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4426978A JPS6011419B2 (en) 1978-04-17 1978-04-17 How to make a shadow mask

Publications (2)

Publication Number Publication Date
JPS54137271A true JPS54137271A (en) 1979-10-24
JPS6011419B2 JPS6011419B2 (en) 1985-03-26

Family

ID=12686788

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4426978A Expired JPS6011419B2 (en) 1978-04-17 1978-04-17 How to make a shadow mask

Country Status (1)

Country Link
JP (1) JPS6011419B2 (en)

Cited By (2)

* 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
JPH0240840A (en) * 1988-07-30 1990-02-09 Dainippon Screen Mfg Co Ltd Shadow mask for color picture tube

Cited By (2)

* 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
JPH0240840A (en) * 1988-07-30 1990-02-09 Dainippon Screen Mfg Co Ltd Shadow mask for color picture tube

Also Published As

Publication number Publication date
JPS6011419B2 (en) 1985-03-26

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