GB644985A - Improvements in electron guns - Google Patents

Improvements in electron guns

Info

Publication number
GB644985A
GB644985A GB27404/45A GB2740445A GB644985A GB 644985 A GB644985 A GB 644985A GB 27404/45 A GB27404/45 A GB 27404/45A GB 2740445 A GB2740445 A GB 2740445A GB 644985 A GB644985 A GB 644985A
Authority
GB
United Kingdom
Prior art keywords
cathode
grid
flange
cylinder
discs
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
GB27404/45A
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 GB644985A publication Critical patent/GB644985A/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
    • H01J29/485—Construction of the gun or of parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2522—Portable

Abstract

644,985. Cathode-ray tubes. SYLVANIA ELECTRIC PRODUCTS, Inc. Oct. 18, 1945, No. 27404. Convention date, Nov. 29, 1944. [Class 39 (i)] An electron gun comprises a tubular cathode 1 closed at one end by a cap 2 having a flat thermionically emitting portion and provided at its open end with a flat annular flange 3 ; a heater unit 10 enclosed by the cathode ; a cup-shaped grid electrode 5 surrounding the cathode and having a disc portion 6 with an aperture 7 aligned with the flat portion of the cathode and diametrically opposed tabs 8 and 9 ; two axially aligned ceramic discs 21 and 22 between which the cathode flange 3 is tightly held, one of said discs 21 having a central opening forming a tight fit around the cathode and the other of said discs 22 having attached thereto pairs of metal straps 13, 14 and 15, 16 attached to the terminal legs 11 and 12 of the cathode heater 10 ; and cylinder 17 with annularly flanged shield 18 and retainer ring 19 with flange 20 clamping together the discs 21, 22 and cathode flange 3. The shield 18 has a conical extension 18a and a centrally apertured flat portion 18b. The cathode tab 23 is welded to the cathode flange 3. Other gun electrodes may be mounted above and attached to the grid electrode. The grid electrode 5, 6 and the cathode unit formed of the remaining members are relatively positioned by inserting a fixed length of the gauge pin of a micrometer dial gauge through the aperture 7 of the grid disc 6, pushing the cathode unit into the grid cylinder 5 to engage the flat cathode end with the free end of the micrometer gauge pin and continuing pushing the cathode unit into the grid cylinder until the micrometer dial indicates a desired depth of the gauge pin within the grid aperture and welding the grid cylinder 5 to the cylinder 17.
GB27404/45A 1944-11-29 1945-10-18 Improvements in electron guns Expired GB644985A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US565662A US2386790A (en) 1944-11-29 1944-11-29 Electron gun and the like

Publications (1)

Publication Number Publication Date
GB644985A true GB644985A (en) 1950-10-25

Family

ID=24259600

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27404/45A Expired GB644985A (en) 1944-11-29 1945-10-18 Improvements in electron guns

Country Status (2)

Country Link
US (1) US2386790A (en)
GB (1) GB644985A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431137A (en) * 1944-01-18 1947-11-18 Kreisler Mfg Corp Jacques Cathode assembly
US2432789A (en) * 1945-06-18 1947-12-16 Kreisler Mfg Corp Jacques Cathode assembly
US2436265A (en) * 1945-07-27 1948-02-17 Du Mont Allen B Lab Inc Cathode-ray tube
US2510267A (en) * 1946-10-30 1950-06-06 Rca Corp Grid cathode assembly for cathoderay tubes
BE527412A (en) * 1953-03-20
US2758236A (en) * 1955-04-22 1956-08-07 Griffiths Electronics Inc Control of electron emission
US2833952A (en) * 1955-10-14 1958-05-06 Sylvania Electric Prod Cathode ray tube electrode assembly
US2922062A (en) * 1956-05-08 1960-01-19 Tung Sol Electric Inc Demountable gun for cathode ray tubes
JPS5242591B2 (en) * 1972-12-08 1977-10-25
US4000435A (en) * 1975-06-20 1976-12-28 Westinghouse Electric Corporation Electron gun cathode with a fast warm-up characteristic
KR910007793B1 (en) * 1988-11-02 1991-10-02 삼성전관 주식회사 Cathode of crt and the method of making the same

Also Published As

Publication number Publication date
US2386790A (en) 1945-10-16

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