JPS54117677A - Electron gun - Google Patents

Electron gun

Info

Publication number
JPS54117677A
JPS54117677A JP2452678A JP2452678A JPS54117677A JP S54117677 A JPS54117677 A JP S54117677A JP 2452678 A JP2452678 A JP 2452678A JP 2452678 A JP2452678 A JP 2452678A JP S54117677 A JPS54117677 A JP S54117677A
Authority
JP
Japan
Prior art keywords
side direction
hole
defocus
reduced
plate thickness
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.)
Pending
Application number
JP2452678A
Other languages
Japanese (ja)
Inventor
Masanobu Takada
Mitsuru Otake
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
Priority to JP2452678A priority Critical patent/JPS54117677A/en
Publication of JPS54117677A publication Critical patent/JPS54117677A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To improve an assembling precision to reduce a deflecting defocus by making the plate thickness of the wall face of the full-circle hole of the first grid electrode plate in the part corresponding to the longer side direction of a CRT scanning face thinner than that in the part corresponding to the shorter side direction.
CONSTITUTION: A full-circle electron passing hole is provided in a grid. Plate thickness tH around the hole in the longer side direction A-A' section of a scanning face is made thinner than plate thickness tO around the hole in the shorter side direction B-B' section. In comparison with tH=tO, a beam scattering angle is reduced to 70% and a beam radius and the defocus in the A-A' direction are reduced in case of tH=0.5 tO. TH/tO=0.3 to 0.8 is proper, and a work efficiency is bad in case of tH/tO below 0.3. Thus, since the part processing is possible with a high precision, the assembling precision is improved, and the work is easy, and the deflecting defocus is reduced.
COPYRIGHT: (C)1979,JPO&Japio
JP2452678A 1978-03-06 1978-03-06 Electron gun Pending JPS54117677A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2452678A JPS54117677A (en) 1978-03-06 1978-03-06 Electron gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2452678A JPS54117677A (en) 1978-03-06 1978-03-06 Electron gun

Publications (1)

Publication Number Publication Date
JPS54117677A true JPS54117677A (en) 1979-09-12

Family

ID=12140589

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2452678A Pending JPS54117677A (en) 1978-03-06 1978-03-06 Electron gun

Country Status (1)

Country Link
JP (1) JPS54117677A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5641651A (en) * 1979-09-13 1981-04-18 Toshiba Corp Electron gun for cathode ray tube
US4645469A (en) * 1980-08-04 1987-02-24 North American Philips Consumer Electronics Corp. Beam shaping CRT electrode and method of fabricating same
US4891549A (en) * 1986-05-23 1990-01-02 Nokia Graetz Electron gun system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245259A (en) * 1975-10-07 1977-04-09 Matsushita Electronics Corp Color picture tube device
JPS52149965A (en) * 1976-06-09 1977-12-13 Sony Corp Signal feedback type color cathode ray tube
JPS5315741A (en) * 1976-07-29 1978-02-14 Toshiba Corp Cathode-ray tube
JPS5485666A (en) * 1977-11-24 1979-07-07 Philips Nv Crt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245259A (en) * 1975-10-07 1977-04-09 Matsushita Electronics Corp Color picture tube device
JPS52149965A (en) * 1976-06-09 1977-12-13 Sony Corp Signal feedback type color cathode ray tube
JPS5315741A (en) * 1976-07-29 1978-02-14 Toshiba Corp Cathode-ray tube
JPS5485666A (en) * 1977-11-24 1979-07-07 Philips Nv Crt

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5641651A (en) * 1979-09-13 1981-04-18 Toshiba Corp Electron gun for cathode ray tube
JPH0142108B2 (en) * 1979-09-13 1989-09-11 Tokyo Shibaura Electric Co
US4645469A (en) * 1980-08-04 1987-02-24 North American Philips Consumer Electronics Corp. Beam shaping CRT electrode and method of fabricating same
US4891549A (en) * 1986-05-23 1990-01-02 Nokia Graetz Electron gun system

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