US2799800A - Cathode ray tube deflection systems - Google Patents

Cathode ray tube deflection systems Download PDF

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Publication number
US2799800A
US2799800A US553105A US55310555A US2799800A US 2799800 A US2799800 A US 2799800A US 553105 A US553105 A US 553105A US 55310555 A US55310555 A US 55310555A US 2799800 A US2799800 A US 2799800A
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US
United States
Prior art keywords
coil
resistance
deflection
ray tube
cathode ray
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 - Lifetime
Application number
US553105A
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English (en)
Inventor
Starks-Field Alfred Benjamin
Ward Ronald Arthur
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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 claimed from GB459455A external-priority patent/GB783899A/en
Application filed by Marconi Co Ltd filed Critical Marconi Co Ltd
Application granted granted Critical
Publication of US2799800A publication Critical patent/US2799800A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03K4/39—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 an amplifier
    • H03K4/43—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 an amplifier combined with means for generating the driving pulses
    • 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
    • H03K4/39—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 an amplifier

Definitions

  • This invention relates to cathode ray tube deflection systems and more specifically to electro-magnetic deflection systems of the kind in which a feedback circuit is provided in association with a deflection amplifier in order to ensure that the current through a deflection coil shall be substantially proportional to the voltage input to the deflection amplifier-usually, though not necessarily, a saw tooth voltage wave input.
  • Fig. 1 is a diagram of a known arrangement and is provided for the purposes of explanation
  • Fig. 2 is a diagram of an embodiment of this invention.
  • a deflection coil of a cathode ray tube (not shown) through which is required to flow a saw tooth current wave form corresponding to a saw tooth voltage wave form applied at an input terminal 2.
  • the voltage wave form at 2 is applied through a resistance 3 and any known convenient linear amplifier 4 to the control grid of a driving deflection amplifier valve 5, exemplified as a triode.
  • the coil 1 is in the anode circuit of the valve 5 and in some cases there is included in series with it an additional external resistance.
  • the internal resistance of the coil 1 may be represented as a series resistance and in Fig. 1 the resistance 6 is intended to represent the internal resistance of the coil 1 and that of any external resistance provided.
  • Across the coil-resistance circuit 1--6 is a resistance-capacity time constant circuit consisting of a resistance 7 and a condenser 8 and the junction between these elements is connected back to the input of the amplifier 4 through a resistance 9.
  • the elements 7 and 8 are so dimensioned that the time constant provided thereby is substantially equal to the time constant of the coil branch (1-6) of the anode circuit network.
  • Fig. 1 The well known system of Fig. 1 has, however, a serious defect, namely that the internal resistance of the coil 1 (which is normally made of copper) varies considerably with variations in temperature (especially during the starting up period when the coil is first brought into use) and such variations cause variations in feedback and accordingly failure to maintain the required fidelity of coil current wave form to input voltage wave form.
  • the object of the present invention is to avoid this defect.
  • a deflection system for a cathode ray tube deflection coil comprises a driving defiection amplifier, an external resistance in series with said deflection coil in the output circuit of said amplifier, a second coil tightly coupled magnetically to said deflec- 2,799,800 Patented July 16, 1957 tion coil and connected at one end to a point between said external resistance and said deflection coil, a time constant resistance-capacity circuit, the product of whose resistance Iandcapacity is substantially equal to the quotientof the "mutual inductance of the two coils divided by the resistance of said external resistance, and means for feeding back voltage built up across said capacity to the input of said driving amplifier.
  • the two tightly coupled coils areconstituted by a single coil structure wound in bifilar fashion.
  • the deflection coil and the second coil may be arranged to constitute in effect a 1:1 transformer.
  • FIG. 2 An embodiment of the invention is illustrated in Fig. 2 in which like references indicate the same parts as in Fig. 1.
  • the deflection coil proper 1 which is in the anode circuit of the final valve 5 of the driving deflection amplifier 4-5, forms part of a bifilar coil structure of which the other part is constituted by a second coil 10 tightly coupled to said deflection coil.
  • the resistance 6a represents the total effective internal resistance of the coil 1.
  • an external resistance 6b In series with the coil 1 is an external resistance 6b.
  • the coil 10 is connected at one end to the junction point of 6a with 6b., i.e. between the actual coil 1 and the external resistance 6b.
  • a time constant circuit 78 which is so dimensioned that the product of the resistance of element 7 into the capacity of element 8 is substantially equal to M R where M is the mutual inductance between the coils 1 and 10 and R is the resistance of the external resistance 6b.
  • M is the mutual inductance between the coils 1 and 10
  • R is the resistance of the external resistance 6b.
  • the mutual inductance between coils 1 and 10 is represented conventionally in Fig. 2 by a double ended curved arrow M. It may be shown that with the parts thus dimensioned the voltage across the condenser 8 will be substantially equal to the voltage developed across the external resistance element 6b. It will be seen, therefore, that the internal resistance of the coil 1, namely the resistance represented in Fig.
  • a deflection system for a cathode ray tube deflection coil comprising a driving deflection amplifier, an external resistance in series with said deflection coil in the output circuit of said amplifier, a second coil tightly coupled magnetically to said deflection coil and connected at one end to a point between said external resistance and said deflection coil, and at the other end to the resistance end of a time constant resistance-capacity circuit, the product of whose resistance and capacity is substantially equal to the quotient of the mutual inductance of the two coils divided by the resistance of said external resistance, and whose capacity end is connected to the end of said external resistance opposite to that by which said external resistance is connected to said deflection coil, and means for feeding back voltage built up across said capacity to the input of said driving amplifier.
  • a circuit extending from the output anode point of said amplifier to a source of anode potential therefor and including, in the order stated, the deflection coil and an external resistance, an inductance coil wound bifilar with said deflection coil and connected at one end to the junction point of said deflection coil with said external resistance, the other end of said inductance coil being connected through a further resistance and thence through a condenser to said anode potential source, the product of the value of said further resistance into that of said condenser being substantially equal to the quotient of the value of the material inductance between said deflection coil and said inductance coil divided by the value of said external resistance, and a connection between the junction point of said further resistance with said condenser and the input circuit of said amplifier.

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  • Details Of Television Scanning (AREA)
US553105A 1955-02-16 1955-12-14 Cathode ray tube deflection systems Expired - Lifetime US2799800A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB459455A GB783899A (en) 1955-02-16 1955-02-16 Improvements in or relating to cathode ray tube deflection systems
GB2799800X 1955-10-11

Publications (1)

Publication Number Publication Date
US2799800A true US2799800A (en) 1957-07-16

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ID=32328009

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US553105A Expired - Lifetime US2799800A (en) 1955-02-16 1955-12-14 Cathode ray tube deflection systems

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Country Link
US (1) US2799800A (enrdf_load_stackoverflow)
DE (1) DE1011922B (enrdf_load_stackoverflow)
NL (1) NL203533A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427498A (en) * 1965-10-24 1969-02-11 Motorola Inc Vertical deflection system for television
US3646393A (en) * 1969-09-10 1972-02-29 Sarkes Tarzian Linear sawtooth scan generator utilizing negative feedback and miller integration
US5161692A (en) * 1991-08-02 1992-11-10 Inland Container Corporation Open-sided container apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1089413B (de) * 1957-07-25 1960-09-22 Blaupunkt Werke Gmbh Schaltungsanordnung fuer die vertikale Ablenkung des Kathodenstrahles in Fernsehgeraeten
DE2936911A1 (de) * 1979-09-12 1981-04-02 Siemens AG, 1000 Berlin und 8000 München Verfahren und vorrichtung zur regelung eines magnetischen ablenksystems

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521741A (en) * 1950-09-12 Deflection circuit
US2561586A (en) * 1948-02-11 1951-07-24 Philco Corp Deflection circuit for cathode-ray tubes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL167604C (nl) * 1952-02-21 Kernverfahrenstechnik Gmbh Werkwijze voor het door middel van centrifugaalkrachten scheiden van een tenminste gedeeltelijk geioniseerd gasmengsel in een lichte en in een zware fractie, alsmede inrichting voor toepassing van de werkwijze.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2521741A (en) * 1950-09-12 Deflection circuit
US2561586A (en) * 1948-02-11 1951-07-24 Philco Corp Deflection circuit for cathode-ray tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427498A (en) * 1965-10-24 1969-02-11 Motorola Inc Vertical deflection system for television
US3646393A (en) * 1969-09-10 1972-02-29 Sarkes Tarzian Linear sawtooth scan generator utilizing negative feedback and miller integration
US5161692A (en) * 1991-08-02 1992-11-10 Inland Container Corporation Open-sided container apparatus

Also Published As

Publication number Publication date
NL203533A (enrdf_load_stackoverflow)
DE1011922B (de) 1957-07-11

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