GB646779A - Improvements relating to beam-deflecting circuits for cathode ray tubes - Google Patents

Improvements relating to beam-deflecting circuits for cathode ray tubes

Info

Publication number
GB646779A
GB646779A GB6545/47A GB654547A GB646779A GB 646779 A GB646779 A GB 646779A GB 6545/47 A GB6545/47 A GB 6545/47A GB 654547 A GB654547 A GB 654547A GB 646779 A GB646779 A GB 646779A
Authority
GB
United Kingdom
Prior art keywords
damping valve
saw
inductor
wave
voltage
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
GB6545/47A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB646779A publication Critical patent/GB646779A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H03K4/28—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device

Landscapes

  • Details Of Television Scanning (AREA)

Abstract

646,779. Saw-tooth generating circuits. RADIO CORPORATION OF AMERICA. March 8, 1947, No. 6545. Convention date, March 9, 1946. [Class 40 (vi)] In a magnetic deflecting circuit for a C.R. tube, used in television apparatus, in which a damping valve is used to suppress undesired H.F. oscillations, a voltage derived from the saw-tooth current has its wave-shape altered and is applied to the damping valve to improve the linearity of the sawtooth current. The Figure shows a deflecting circuit for a C.R. tube 26 in which a voltage 12 applied to valve 10 generates a saw-tooth current in the deflecting coils 14. Undesired H.F. oscillations occurring at the end of the forward trace are suppressed by the damping valve 40 and the network 42, 52. The non-linearity of the forward trace introduced by the damping circuits is compensated for by applying a voltage derived from the transformer winding 18 and phase-shifted by the network 58, 60 to the cathode of the diode 40. Inductor 60 may be permeability tuned to enable the wave-shape of the linearizing voltage to be adjusted. In a modification, Fig. 4 (not shown), the inductor 60 of Fig. 1 is fixed and the wave-shape is varied by means of two variable inductors connected in series with each of capacitors 42, 58. In a further modification, Fig. 5 (not shown), the cathode of the damping valve and the lead to the scanning transformer are connected to tappings on the inductor 60.
GB6545/47A 1946-03-09 1947-03-08 Improvements relating to beam-deflecting circuits for cathode ray tubes Expired GB646779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US653261A US2440418A (en) 1946-03-09 1946-03-09 Cathode-ray beam deflecting circuit

Publications (1)

Publication Number Publication Date
GB646779A true GB646779A (en) 1950-11-29

Family

ID=24620131

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6545/47A Expired GB646779A (en) 1946-03-09 1947-03-08 Improvements relating to beam-deflecting circuits for cathode ray tubes

Country Status (5)

Country Link
US (1) US2440418A (en)
DE (1) DE974781C (en)
FR (1) FR942512A (en)
GB (1) GB646779A (en)
NL (1) NL130803C (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL78083C (en) * 1946-04-17
FR957236A (en) * 1946-12-14 1950-02-17
US2474474A (en) * 1947-02-25 1949-06-28 Rca Corp Power recovery circuit for cathoderay apparatus deflection systems
NL131738C (en) * 1947-04-21
US2579014A (en) * 1947-12-04 1951-12-18 Motorola Inc Saw-tooth current generator
US2543831A (en) * 1948-02-10 1951-03-06 Belmont Radio Corp Protection of cathode-ray tube screens
BE488391A (en) * 1948-04-09
US2587420A (en) * 1948-08-31 1952-02-26 Rca Corp Linearity control for cathode-ray tubes
GB653778A (en) * 1948-09-17 1951-05-23 Patrick Richard James Court Improvements in or relating to apparatus incorporating a cathode ray device particularly television receivers
NL148552C (en) * 1948-09-21
NL149165B (en) * 1948-10-26 Lepetit Spa PROCESS FOR THE PREPARATION OF A MEDICINAL PRODUCT CONTAINING AS AN ACTIVE COMPOUND A DERIVATIVE OF 2-AMINO-1,2,3,4-TETRAHYDROISOQUINOLINE, FORMED MEDICINAL PRODUCT, AND PROCESS FOR PREPARING THE PROCEDURES.
NL86383C (en) * 1948-11-24
US2621308A (en) * 1949-03-31 1952-12-09 Rca Corp Electronic tube and circuits
US2565392A (en) * 1949-04-16 1951-08-21 Tele Tone Radio Corp Horizontal deflection circuit
US2536838A (en) * 1949-05-24 1951-01-02 Rca Corp High-efficiency cathode-ray beam deflection system
US2536839A (en) * 1949-05-24 1951-01-02 Rca Corp Power recovery cathode-ray beam deflection system
US2611106A (en) * 1949-07-20 1952-09-16 Motorola Inc Television sweep system
US2543720A (en) * 1949-08-10 1951-02-27 Rca Corp Electromagnetic deflection circuit
US2543305A (en) * 1949-12-16 1951-02-27 Avco Mfg Corp Circuit for suppressing undesired oscillations in television receivers
US2599798A (en) * 1950-01-13 1952-06-10 Avco Mfg Corp Linearity control circuit for television receivers
US2545346A (en) * 1950-03-22 1951-03-13 Avco Mfg Corp Automatic frequency control for television receivers
US2627051A (en) * 1950-08-29 1953-01-27 Rca Corp Electron tube voltage protection circuit
US2702874A (en) * 1950-12-13 1955-02-22 Zenith Radio Corp Deflection system
US2702875A (en) * 1951-03-09 1955-02-22 Zenith Radio Corp Deflection system
US2644103A (en) * 1951-12-11 1953-06-30 Motorola Inc Television deflection system
NL88020C (en) * 1951-12-19
US2837692A (en) * 1953-08-19 1958-06-03 Rca Corp Cathode ray beam deflection apparatus
US3733513A (en) * 1969-04-30 1973-05-15 Hunt Electronics Co Circuits for centering pictures on television screens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2251851A (en) * 1939-06-16 1941-08-05 Philco Radio & Television Corp Electron-beam deflecting circuit
GB534705A (en) * 1939-09-18 1941-03-14 Philco Radio & Television Corp Improvements in deflecting output circuits for cathode ray tubes
US2382822A (en) * 1942-06-30 1945-08-14 Rca Corp Cathode ray beam deflecting circuits

Also Published As

Publication number Publication date
DE974781C (en) 1961-04-27
NL130803C (en)
FR942512A (en) 1949-02-10
US2440418A (en) 1948-04-27

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