GB762550A - Improvements in or relating to electron discharge devices - Google Patents

Improvements in or relating to electron discharge devices

Info

Publication number
GB762550A
GB762550A GB30049/54A GB3004954A GB762550A GB 762550 A GB762550 A GB 762550A GB 30049/54 A GB30049/54 A GB 30049/54A GB 3004954 A GB3004954 A GB 3004954A GB 762550 A GB762550 A GB 762550A
Authority
GB
United Kingdom
Prior art keywords
control electrodes
cathode
intensity
colour
flanged
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
GB30049/54A
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.)
Space Systems Loral LLC
Original Assignee
Philco Ford 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
Priority to US2712087D priority Critical patent/US2712087A/en
Application filed by Philco Ford Corp filed Critical Philco Ford Corp
Priority to GB30049/54A priority patent/GB762550A/en
Publication of GB762550A publication Critical patent/GB762550A/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
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/50—Plurality of guns or beams
    • H01J2229/507—Multi-beam groups, e.g. number of beams greater than number of cathodes

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

762,550. Cathode-ray tubes. MORLE, C. W. [Philco Corporation]. Oct. 19, 1954, No. 30049/54. Class 39(1). A cathode ray tube, preferably a colour television receiver, has a gun for producing two or more electron beams individually controllable in intensity comprising conductive flanged cylinder 20, Fig. 2, housing cathode 30 and having peripheral apertures through which intensity control electrodes 34, 36 pass, electrodes 34, 36 being coplanar and having insulating spacing washers 44, 46 on either side thereof, and the emissive cathode surface is positioned closely adjacent to the intensity control electrodes 34, 36. A flanged cylinder 20 of nickel or stainless steel has slots 26, 28 through which spade shaped control electrodes 34, 36 pass. The control electrodes have apertures 38, 40 of equal or unequal sizes according as to whether the beams passing through them are of equal or unequal cross section, and are held in position by insulating washers 44, 46 preferably of mica or ceramic and a flanged metal ring 48 welded to cylinder 20. It is stated that electrons cannot pass through the gap between the two control electrodes. The indirectly heated cathode 30 is carried by steatite or lavite disc 50 and is spaced from the control electrodes by annular steatite or lavite spacer 56 ; disc 50 is locked in position by flanged ring 58 welded to 20. All the spacers are accurately dimensioned. The assembly is supported by ears 68 fused to glass rods and by the electrode leads ; the glass rods also carry the gun anode. A ribbed disc, Fig. 1 (not shown) centres the assembly within the tube neck. To make both beams coincide where they strike the screen, the shape of the control electrodes is modified by giving the adjacent ends of the control electrodes semi-spherical shapes or by inclining their ends, Figs. 4, 5 (not shown). The invention is preferably applied to the dual beam colour television receiver disclosed in Specification 745,353 employing indexing means in which the intensity of the auxiliary beam is independently varied by a pilot carrier signal having a frequency outside the frequency bands of the colour video signals to generate an indexing signal. It may also be applied to colour television receivers in which each beam carries a video signal of one colour.
GB30049/54A 1954-10-19 1954-10-19 Improvements in or relating to electron discharge devices Expired GB762550A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US2712087D US2712087A (en) 1954-10-19 Plural beam electron discharge devices
GB30049/54A GB762550A (en) 1954-10-19 1954-10-19 Improvements in or relating to electron discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30049/54A GB762550A (en) 1954-10-19 1954-10-19 Improvements in or relating to electron discharge devices

Publications (1)

Publication Number Publication Date
GB762550A true GB762550A (en) 1956-11-28

Family

ID=10301432

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30049/54A Expired GB762550A (en) 1954-10-19 1954-10-19 Improvements in or relating to electron discharge devices

Country Status (2)

Country Link
US (1) US2712087A (en)
GB (1) GB762550A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734583A1 (en) * 1994-09-06 1996-10-02 Ltd. Chunghwa Picture Tubes Multi-mode, hybrid-type crt and electron gun therefor

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950406A (en) * 1954-05-10 1960-08-23 Philco Corp Precision cathode-ray tube assembly
US2891183A (en) * 1954-12-17 1959-06-16 Philco Corp Precision dual-beam cathode-ray tube
US2913617A (en) * 1957-03-04 1959-11-17 Gen Electric Electron beam discharge device
US2919380A (en) * 1957-07-23 1959-12-29 Philco Corp Electron discharge devices
US3062984A (en) * 1959-03-05 1962-11-06 Philips Corp Pulse-counting device and counting tubes for such devices
NL241133A (en) * 1959-07-09
US3005123A (en) * 1959-07-16 1961-10-17 Griffiths Electronics Inc Electron gun construction
US3278779A (en) * 1962-05-17 1966-10-11 Rauland Corp Cathode-ray tube having an insulating spacer between the cathode and the control grid
US4251747A (en) * 1979-11-15 1981-02-17 Gte Products Corporation One piece astigmatic grid for color picture tube electron gun

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB402460A (en) * 1932-06-02 1933-12-04 Emi Ltd Improvements in or relating to cathode ray tubes
US2068287A (en) * 1933-10-14 1937-01-19 Gabor Denes Electric lamp
GB493790A (en) * 1937-04-30 1938-10-14 British Thomson Houston Co Ltd Improvements in or relating to cathode ray devices
US2177366A (en) * 1937-05-29 1939-10-24 Rca Corp Television system
US2556824A (en) * 1946-03-28 1951-06-12 Rca Corp Cathode-ray tube
US2510267A (en) * 1946-10-30 1950-06-06 Rca Corp Grid cathode assembly for cathoderay tubes
US2459724A (en) * 1946-11-27 1949-01-18 Farnsworth Res Corp Astatic cathode-ray tube
US2496825A (en) * 1947-04-10 1950-02-07 Rauland Corp Unitary ceramic electron gun
US2587074A (en) * 1948-09-29 1952-02-26 Rca Corp Color television image reproducing system
US2579351A (en) * 1949-08-30 1951-12-18 Rca Corp Isocon pickup tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734583A1 (en) * 1994-09-06 1996-10-02 Ltd. Chunghwa Picture Tubes Multi-mode, hybrid-type crt and electron gun therefor
EP0734583A4 (en) * 1994-09-06 1997-06-04 Chunghwa Picture Tubes Ltd Multi-mode, hybrid-type crt and electron gun therefor

Also Published As

Publication number Publication date
US2712087A (en) 1955-06-28

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