GB966469A - Surge protective device for cathode-ray tubes - Google Patents

Surge protective device for cathode-ray tubes

Info

Publication number
GB966469A
GB966469A GB11959/63A GB1195963A GB966469A GB 966469 A GB966469 A GB 966469A GB 11959/63 A GB11959/63 A GB 11959/63A GB 1195963 A GB1195963 A GB 1195963A GB 966469 A GB966469 A GB 966469A
Authority
GB
United Kingdom
Prior art keywords
cathode
gap
wire
spark
potential
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
Application number
GB11959/63A
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB966469A publication Critical patent/GB966469A/en
Expired 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/484—Eliminating deleterious effects due to thermal effects, electrical or magnetic fields; Preventing unwanted emission
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

966,469. Cathode-ray tubes; spark apparatus. SYLVANIA ELECTRIC PRODUCTS Inc. March 26, 1963 [March 28, 1962], No. 11959/63. Heading H1D. A cathode-ray tube having a cathode 20, control grid G1, a screen grid G2 and an accelerating anode G3 incorporates within an envelope 12 a surge by-pass device comprising a wire 32 connected through a lead 34 to earth potential and having a spark-gap 36 such that the sparking potential between the wire 32 and the screen-grid G2 is less than the sparking- potential of gap 30 between grids G2 and G1. The wire 32 is made of a nickel alloy or a coldemitter such as titanium, magnesium or a barium-nickel alloy. In alternative embodiments the surge by-pass device comprises (1) a gas-filled encapsulating, hermetically sealed envelope having a pair of spaced plate electrodes forming the spark-gap 36; (2) a U-shaped insulating member having two spaced plateelectrodes and (3) a cylindrical insulating block having end-plates with raised bosses forming the electrodes.
GB11959/63A 1962-03-28 1963-03-26 Surge protective device for cathode-ray tubes Expired GB966469A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US183246A US3267321A (en) 1962-03-28 1962-03-28 Electron discharge device having cathode protective means within the envelope

Publications (1)

Publication Number Publication Date
GB966469A true GB966469A (en) 1964-08-12

Family

ID=22672052

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11959/63A Expired GB966469A (en) 1962-03-28 1963-03-26 Surge protective device for cathode-ray tubes

Country Status (2)

Country Link
US (1) US3267321A (en)
GB (1) GB966469A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3546536A (en) * 1968-03-28 1970-12-08 Stanley Umin Means to indicate,control and cut off excessive x-radiation from television sets
US3921078A (en) * 1971-04-20 1975-11-18 Jeol Ltd Breakdown protection for field emission electron gun
US3810025A (en) * 1971-04-20 1974-05-07 Jeol Ltd Field emission type electron gun
US3965393A (en) * 1971-04-21 1976-06-22 Admiral Corporation Television X-radiation protection device and circuit
US3917981A (en) * 1973-06-07 1975-11-04 Colt Ind Operating Corp Scale lightning protection system
US4041357A (en) * 1976-05-21 1977-08-09 Rca Corporation High voltage protection circuit
US4161673A (en) * 1977-06-30 1979-07-17 Zenith Radio Corporation Arc suppression and static elimination system for a television CRT
US4326762A (en) * 1979-04-30 1982-04-27 Zenith Radio Corporation Apparatus and method for spot-knocking television picture tube electron guns
DE29713767U1 (en) * 1997-08-01 1998-08-27 Siemens Ag cathode ray tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE405609A (en) * 1933-10-11
US2295379A (en) * 1940-02-29 1942-09-08 Westinghouse Electric & Mfg Co Low voltage protective device
US3045143A (en) * 1959-07-03 1962-07-17 Gen Electric Spark gap protector

Also Published As

Publication number Publication date
US3267321A (en) 1966-08-16

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