US2152822A - Relaxation oscillation for interlaced scanning - Google Patents

Relaxation oscillation for interlaced scanning Download PDF

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Publication number
US2152822A
US2152822A US50738A US5073835A US2152822A US 2152822 A US2152822 A US 2152822A US 50738 A US50738 A US 50738A US 5073835 A US5073835 A US 5073835A US 2152822 A US2152822 A US 2152822A
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US
United States
Prior art keywords
condenser
relaxation oscillation
interlaced scanning
relaxation
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 - Lifetime
Application number
US50738A
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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
Application granted granted Critical
Publication of US2152822A publication Critical patent/US2152822A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H03K4/86—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements gas-filled tubes or spark-gaps

Definitions

  • the present invention relates to a relaxation oscillation connection, more particularly for television receivers, which are constructed to receive a transmission from a television transmitter operating with interlaced scanning.
  • Fig. 1 shows the relaxation oscillation system according to the invention.
  • Fig. 2 shows a diagram of the charging and discharging periods of a relaxation oscillation connection for interlaced scanning.
  • the relaxation apparatus operating with charging condenser, charging resistance and gasfilled glow discharge tube has proved to be extremely satisfactory upon the television reception of normal screen transmissions.
  • Fig. 1, 3 is a gasfilled discharge tube having anode 4, hot cathode 5 and control grid 6.
  • the latter is, as well known, negatively biassed and is made positive by the synchronizing signals coming from the lead 8.
  • the terminal M of the storage condenser I is connected to the anode 4 and via the charging resistance 2 to the positive terminal of a D. C. source whilst the second terminal 13 of the condenser is earthed.
  • the frame deflecting plates of the cathode ray tube (not designated) are connected to the terminals of condenser I.
  • the condenser I is connected in parallel to the anode and cathode of the tube 3 either directly or via a small resistance.
  • the synchronizing signals are given at equal time intervals and the time curve of the deflecting voltage arising in this case is of regular saw-tooth form.
  • Fig. 2 shows a time graph 2
  • the points 22 and 26 lie for the width of a line higher than point 24, point 23 as much higher than the points 2
  • the break-down of the voltage at the points 22 and 24 is obtained at a desired moment by the ignition of the tube caused by the synchronizing impulses. It is, however, not so easy to eifect that the beginning of the recharging of the condenser, i. e. the quenching of the tube, takes place at (e. g.) 25 and not at 25'.
  • this is obtained by inserting in the discharge connection a timing circuit consisting of a condenser l4 shunted by a resistance or self-induction Hi. This way the time between ignition and quenching is kept constant as wanted.
  • a scanning at 2 x lines it has been found that the capacity l4 has to be about 10 times larger than I and the time constant of the circuit l4l 5 some times smaller than the frequency of the relaxation oscillations.
  • a relaxation oscillation device consisting of a gas-filled discharge tube having a hot cathode, a grid and an anode, a lead to conduct to said grid the igniting synchronizing signals, a charging resistance in series and a storage condenser in parallel to said tube and means to connect the terminals of said condenser to the deflecting plates of a cathode ray tube: a timing circuit consisting of a second condenser and an impedance both in parallel to each other, one terminal of said timing circuit being connected to said cathode and the other to said storage condenser.
  • the second condenser having a capacity in the order of 10 times greater than that of the first condenser.
  • the time constant of the timing circuit being a few times smaller than the period of the relaxation oscillations.

Landscapes

  • Details Of Television Scanning (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
US50738A 1934-11-23 1935-11-20 Relaxation oscillation for interlaced scanning Expired - Lifetime US2152822A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE454471X 1934-11-23

Publications (1)

Publication Number Publication Date
US2152822A true US2152822A (en) 1939-04-04

Family

ID=6538917

Family Applications (1)

Application Number Title Priority Date Filing Date
US50738A Expired - Lifetime US2152822A (en) 1934-11-23 1935-11-20 Relaxation oscillation for interlaced scanning

Country Status (4)

Country Link
US (1) US2152822A (enrdf_load_stackoverflow)
BE (1) BE412388A (enrdf_load_stackoverflow)
FR (1) FR798087A (enrdf_load_stackoverflow)
GB (1) GB454471A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608128A (en) * 1949-03-09 1952-08-26 W M Welsh Mfg Company Phototube amplification
US2717336A (en) * 1953-05-08 1955-09-06 Michael Res Company Inc Flasher circuit
US2915677A (en) * 1952-12-26 1959-12-01 Ibm Gas tube pulse generator
US2973484A (en) * 1958-09-16 1961-02-28 Roy Ross F De Frequency division system for electronic organ or the like

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608128A (en) * 1949-03-09 1952-08-26 W M Welsh Mfg Company Phototube amplification
US2915677A (en) * 1952-12-26 1959-12-01 Ibm Gas tube pulse generator
US2717336A (en) * 1953-05-08 1955-09-06 Michael Res Company Inc Flasher circuit
US2973484A (en) * 1958-09-16 1961-02-28 Roy Ross F De Frequency division system for electronic organ or the like

Also Published As

Publication number Publication date
GB454471A (en) 1936-10-01
FR798087A (fr) 1936-05-08
BE412388A (enrdf_load_stackoverflow)

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