GB644327A - Projection cathode ray tubes - Google Patents

Projection cathode ray tubes

Info

Publication number
GB644327A
GB644327A GB21923/47A GB2192347A GB644327A GB 644327 A GB644327 A GB 644327A GB 21923/47 A GB21923/47 A GB 21923/47A GB 2192347 A GB2192347 A GB 2192347A GB 644327 A GB644327 A GB 644327A
Authority
GB
United Kingdom
Prior art keywords
electron
cathode
focusing
baffle
tube
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
GB21923/47A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB644327A publication Critical patent/GB644327A/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

Abstract

644,327. Cathode-ray tubes. STANDARD TELEPHONES & CABLES, Ltd. Aug. 8, 1947, No. 21923. Convention date, Dec. 19, 1946. [Class 39 (i)] In a cathode-ray tube for use as a high intensity fluorescent light source, high current density in the final cathode-ray beam is attained without correspondingly increasing the second anode voltage or the electron velocity at the screen, by employing a plurality of electron guns for projecting, without deflection of the beams, respective electron beams whose trajectories cross over at a common electron baffle electrode, the guns being individually adapted for focusing the several beams at the electron opening in the baffle to form a virtual cathode thereat, and electrode means adapted in conjunction with magnetic focusing means for focusing on the screen an image of the baffle opening. In one embodiment the cathode-ray tube has two diverging neck portions 11 and 12, arranged at an acute angle with respect to the central longitudinal axis of the tube 13 so that their longitudinal axes intersect at a plane 17-17, and containing electron-emitting cathodes . 18 and 19 and associated control electrodes 20 and 21 which are excited in parallel from a video amplifier. Surrounding the neck portions 11 and 12 are focusing coils 42, and 43, or permanent magnets may be used, which are adjustable by means of screws 47 and 50 to focus the two electron beams on the opening 38 in a baffle electrode 37 located in the plane 17-17, the side of the baffle electrode facing the cathodes being coated with fluorescent material to facilitate said focusing. A coil 54 acts as an electron lens to form on the fluorescent screen 16 an image of the virtual cathode at the opening 38. The tube is provided with internal conductive coatings 24 and 39 of, for example, colloidal graphite, forming first and second accelerating anodes, and has a conventional deflecting coil 55. Voltage supplies are obtained from a system of resistances connected across a supply of the order of 8000 volts, the cathodes being connected to a potentiometer slider arm 28, enabling them to be suitably biassed. A greater number of electron guns may be employed, said guns being arranged symmetrically around the longitudinal axis of the tube.
GB21923/47A 1946-12-19 1947-08-08 Projection cathode ray tubes Expired GB644327A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US717224A US2457175A (en) 1946-12-19 1946-12-19 Projection cathode-ray tube

Publications (1)

Publication Number Publication Date
GB644327A true GB644327A (en) 1950-10-11

Family

ID=24881192

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21923/47A Expired GB644327A (en) 1946-12-19 1947-08-08 Projection cathode ray tubes

Country Status (2)

Country Link
US (1) US2457175A (en)
GB (1) GB644327A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1024175B (en) * 1951-09-26 1958-02-13 Rca Corp Cathode ray tubes for generating several bundles of rays
DE1107835B (en) * 1954-02-09 1961-05-31 Philips Nv Electron beam tube with three electron beams, with an almost flat screen and with a deflection coil system

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL75718C (en) * 1948-07-09 1954-08-16
GB651386A (en) * 1948-12-14 1951-03-14 Cinema Television Ltd Improvements in or relating to cathode ray tubes
US2520728A (en) * 1949-06-09 1950-08-29 Du Mont Allen B Lab Inc Cathode-ray tube deflection sensitivity correction circuit
US2629838A (en) * 1949-08-04 1953-02-24 Technicolor Motion Picture Color television screen with correction for overplay
US2999185A (en) * 1950-01-09 1961-09-05 Harry R Lubcke Television device
US2558120A (en) * 1950-01-17 1951-06-26 Jose W Acosta Push-pull electron tube for instruments or television
US2735031A (en) * 1951-02-15 1956-02-14 woodbridge
BE514227A (en) * 1951-09-26
US2661436A (en) * 1951-11-07 1953-12-01 Rca Corp Ion trap gun
US2672574A (en) * 1952-03-19 1954-03-16 Rca Corp Magnetic beam controlling system
US2880358A (en) * 1952-04-08 1959-03-31 Motorola Inc Color television system
US3011090A (en) * 1952-06-24 1961-11-28 Rca Corp Plural beam tube
US2690517A (en) * 1952-09-30 1954-09-28 Rca Corp Plural beam electron gun
US2677779A (en) * 1953-05-22 1954-05-04 Rca Corp Tricolor kinescope magnetic shield
US2820174A (en) * 1953-05-28 1958-01-14 Rca Corp Tri-color kinescope beam convergence system
BE529845A (en) * 1953-06-25
US2957106A (en) * 1954-08-12 1960-10-18 Rca Corp Plural beam gun
US2844759A (en) * 1955-07-18 1958-07-22 Philco Corp Apparatus and method for overcoming scanning error effects in plural beam cathode ray tubes
US2859378A (en) * 1956-05-21 1958-11-04 Gen Electric Electrode system for cathode ray tubes
US2913611A (en) * 1956-08-27 1959-11-17 Sperry Rand Corp Electron discharge tube with means for trapping positive ions
US2978601A (en) * 1957-12-12 1961-04-04 Kaiser Ind Corp Electronic control system
US3037135A (en) * 1958-08-05 1962-05-29 Gen Dynamics Corp Cathode ray tube of display type
US3051867A (en) * 1959-09-18 1962-08-28 Gen Dynamics Corp Decoding and display means
US4259692A (en) * 1979-10-22 1981-03-31 Rca Corporation Projection kinescope and method of operation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL19841C (en) * 1925-07-08
DE704803C (en) * 1931-04-25 1941-04-07 Ernst Ruska Dr Ing Device for generating one or more electron beam bundles without gas concentration by means of a glow cathode
CH169756A (en) * 1932-12-20 1934-06-15 Berger Karl Ing Dr Multiple cathode ray oscilloscope.
NL52392C (en) * 1936-10-24
GB558143A (en) * 1942-02-06 1943-12-23 Philips Nv Improvements in velocity modulated electron discharge tubes
US2348133A (en) * 1942-09-29 1944-05-02 Rca Corp Method and apparatus for developing electron beams

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1024175B (en) * 1951-09-26 1958-02-13 Rca Corp Cathode ray tubes for generating several bundles of rays
DE1107835B (en) * 1954-02-09 1961-05-31 Philips Nv Electron beam tube with three electron beams, with an almost flat screen and with a deflection coil system

Also Published As

Publication number Publication date
US2457175A (en) 1948-12-28

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