US2163214A - Relaxation oscillation generator - Google Patents

Relaxation oscillation generator Download PDF

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Publication number
US2163214A
US2163214A US739301A US73930134A US2163214A US 2163214 A US2163214 A US 2163214A US 739301 A US739301 A US 739301A US 73930134 A US73930134 A US 73930134A US 2163214 A US2163214 A US 2163214A
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US
United States
Prior art keywords
tube
grid
ohms
relaxation oscillation
discharge
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
US739301A
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English (en)
Inventor
Schlesinger Kurt
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.)
Loewe Opta GmbH
Original Assignee
Loewe Opta GmbH
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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
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Publication of US2163214A publication Critical patent/US2163214A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
    • H03K6/02—Amplifying pulses

Definitions

  • the present invention relates to relaxation oscillation generators in television apparatus, including a gas-filled, grid-controlled, thermionic tube, for producing line and frame deflecting voltages.
  • One object of the invention is to provide means to give the discharge a definite duration, which allows the discharge accurately to be governed, and to accelerate at the same time the break-down of the deflecting voltage after ignition.
  • Another object of the invention is to provide means for compensating a deviation of the straight line form of the deflecting voltage.
  • a further object of the invention is to avoid interferences which may be caused by reaction of the amplifier to the discharge tube or of one of the two generators to the other one.
  • a further object of the invention is to avoid grid currents in the discharge tube when it is in the state of ignition.
  • the grid bias of the discharge tube is taken from the anode Voltage supply in such a manner as to compensate fluctuations in the said supply with regard to the influence exerted on the ignition moment.
  • I is the gas-filled thermionic tube, 2 the storage condenser, 3 the charging resistance and 5 the indirectly heated cathode of the tube, which is positively biassed in relation to the grid by means of the adjustable resistance 4. Since resistance 4 is fed by the anode potential, the grid bias undergoes all fluctuations of this potential so that a shifting of the ignition moment by these fluctuations is safely avoided.
  • the charging potential is fed in through steadying means 2I, 22.
  • the control potentials are supplied to the grid of the tube I by the terminal 6 via a condenser O 24.
  • the anode I of the tube I is connected via the coupling condenser with the control grid 8 of the screen grid amplifier tube 9.
  • Thecontrol grid bias is fed in at IT via steadying means 32, and the grid resistance.
  • the bias of the screen grid I0 is tapped at the potentiometer II in such manner that the commencing exponential curvature of the circuit charging the condenser 2 and consequently of the deflecting voltage is compensated by the opposite curvature in the characteristic of the tube 9.
  • Remaining distortions of the straight line form of the deflecting voltage may be compensated by a high-pass filter consisting of condenser 25 and ohmic resistance 28 connected in parallel, and inserted in the lead coupling both tubes.
  • the working point on the characteristic is, by suitably biassing the control grid, made to be situated in the lower bend.
  • the amplified relaxation oscillation voltage potential i. e. the potential drop across the anode resistance
  • the tap of this potentiometer is connected to the terminal I5, which may be connected directly with the deflecting system of the Braun tube.
  • the condenser 2 discharges in such a short time (about 1 micro-sec.) that the ionisation does not disappear after quenching sufficiently quickly, at least not in the line deflection tube. In this case irregularities occur in the ignitions of the tube, so that a disquietude appears over the entire image in a horizontal direction.
  • the resistance I9 is 100 ohms, with a capacity 2 of 2.10 mf., so that the duration of the discharge is at least equal to or greater than the period of transmission ofan image point, the time constant of the discharge circuit being approximately 2 micro-sec.
  • a resistance 20 of the order of several ten-thousands ohms is provided in the lead to the grid of tube I, which safely prevents the main discharge arc, anode-cathode from partially flashing over to the grid and thereby causing an uncontrollably and unsteady leak current to flow.
  • This measure is not so necessary to be taken in the line frequency as in the frame frequency oscillator.
  • the anode circuits of both amplifiers are, as a whole, carefully screened off against the respective amplifier control grid circuits, taken as a whole, as indicated by the dotted line 30.
  • the line frequency arrangement and the frame-frequency arrangement are prevented from exerting any influence on the working of each other by carefully screening-0E them against each other and by providing separate steadying means 32, 35 for the control grid bias of the two amplifiers.
  • the amplifier tube 9 of the line-frequency arrangement is, according to the invention, silvered on the inside and the silver coating passed to earth to prevent capacitative retroaction from being exerted by the amplified oscillations on the grid circuit of the discharge tube I, which would cause a shifting of the ignition point.
  • a silver coating of this nature in the amplifier tube of the frame-frequency arrangement may be dispensed with because of the lower frequencies.
  • the single elements, for the production of a 180-line pattern may be selected as follows:
  • said circuit means includes a grounded point and a biasing resistance between said cathode and said grounded point.

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Elimination Of Static Electricity (AREA)
US739301A 1933-08-14 1934-08-10 Relaxation oscillation generator Expired - Lifetime US2163214A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE442740X 1933-08-14

Publications (1)

Publication Number Publication Date
US2163214A true US2163214A (en) 1939-06-20

Family

ID=6524781

Family Applications (1)

Application Number Title Priority Date Filing Date
US739301A Expired - Lifetime US2163214A (en) 1933-08-14 1934-08-10 Relaxation oscillation generator

Country Status (4)

Country Link
US (1) US2163214A (xx)
FR (1) FR777151A (xx)
GB (1) GB442740A (xx)
NL (1) NL45863C (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531830A (en) * 1944-08-16 1950-11-28 Albert R Simpson Voltage pulse generator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468394A (en) * 1936-01-14 1937-07-05 Gen Electric Co Ltd Improvements in time bases for cathode ray tubes
DE756444C (de) * 1939-05-13 1953-01-19 Aeg Anordnung zum Linearisieren von aus Teilen einer Exponentialkurve bestehenden Kippschwingungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531830A (en) * 1944-08-16 1950-11-28 Albert R Simpson Voltage pulse generator

Also Published As

Publication number Publication date
FR777151A (fr) 1935-02-13
GB442740A (en) 1936-02-14
NL45863C (xx)

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