US2026915A - Television system - Google Patents

Television system Download PDF

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Publication number
US2026915A
US2026915A US625452A US62545232A US2026915A US 2026915 A US2026915 A US 2026915A US 625452 A US625452 A US 625452A US 62545232 A US62545232 A US 62545232A US 2026915 A US2026915 A US 2026915A
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US
United States
Prior art keywords
resistance
television system
condenser
luminous tube
output valve
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
US625452A
Inventor
Schubert Georg
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.)
FIRM OF FERNSEH AKTIEN GES
FIRM OF FERNSEH AKTIEN-GESELLSCHAFT
Original Assignee
FIRM OF FERNSEH AKTIEN GES
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 FIRM OF FERNSEH AKTIEN GES filed Critical FIRM OF FERNSEH AKTIEN GES
Application granted granted Critical
Publication of US2026915A publication Critical patent/US2026915A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/18—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having a starting switch
    • H05B41/19—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having a starting switch for lamps having an auxiliary starting electrode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations

Definitions

  • This invention relates to television systems, and more particularly to an arrangement of the kind described in the U. S. application Ser. No. 606,471.
  • connection system in which the luminous tube is connected in series with the output tube of the low-frequency amplifier and a resistance, and is traversed in direct fashion by the emissive current of the output tube.
  • the resistance is preferably bridged by a capacity. Since the luminous tube having a positive column possesses a negative characteristic, the same in conjunction with the series-connected resistance and the capacity connected in parallel readily tends towards oscillation.
  • this may be avoided if a portion of the entire resistance is bridged by the condenser shown, so that the oscillations are damped by the part of the resistance which is not bridged, and steady conditions are ensured. If necessary, the bridging condenser should be omitted entirely, and a pure ohmic resistance employed, a condition which certainly would not occur very frequently. Owing to the increased damping on account of the connected resistance greater amplification is certainly required in order to control the luminous tube; however, this disadvantage must be accepted in view of the steady and satisfactory conditions obtained.
  • a luminous tube having a positive column a low frequency amplifier having an output tube,.
  • a source of direct current in the anode circuit of said output tube aresistance in series with said luminous tube in said anode circuit, and a condenser shunted across said source of direct current and a part of the said resistance.
  • a resistance and a positive-column luminous tube 5 having a descending characteristic of current and voltage connected in series with said resistance in the anode circuit of said output valve, a source of direct current in said anode circuit, and a condenser shunted across said source of direct cur- 10 rent and a part of said resistance, whereby that 7 part of the resistance not shunted by said condenser is adapted to damp commencing oscillations.
  • a resistance and a positive-column luminous tube having a descending characteristic of current and voltage connected in series with one another in the anode circuit of said output valve, and a 20 condenser having one of its electrodes connected with the filament circuit of the output valve and having its other electrode connected to said resistance between the ends thereof, whereby only a portion of said resistance is shunted by said 25 condenser.
  • a low-frequency amplifier having an output valve, a resistance and a positive column luminous tube having a descending characteristic of current and voltage connected in series with said resistance in the anode circuit of said output valve, a source of direct current in said anode circuit, and a condenser shunted across said source of direct current and a portion of said resistance, said condenser being adapted to be connected to diiierent points of said resistance, whereby the remaining unshunted portion of said resistance is efiective to damp commencing oscillations.

Description

Jam 1935 V G. SCHUBERT 2,026,915
TELEVISION SYSTEM Filed July 28, 1932 In venzor:
Patented Jan. 7, 1936 TELEVISION SYSTEM Georg Schubert, Berlin, Germany, assignor to the firm of Fernseh Aktien-Gesellschaft, Zehlendorf, near Berlin, Germany Application July 28, 1932, Serial No. 625,452
. In Germany July 30, 1931 4 Claims.
This invention relates to television systems, and more particularly to an arrangement of the kind described in the U. S. application Ser. No. 606,471.
In the United States application in question there is described a connection system in which the luminous tube is connected in series with the output tube of the low-frequency amplifier and a resistance, and is traversed in direct fashion by the emissive current of the output tube. As shown in Fig. 1, the resistance is preferably bridged by a capacity. Since the luminous tube having a positive column possesses a negative characteristic, the same in conjunction with the series-connected resistance and the capacity connected in parallel readily tends towards oscillation.
According now to the invention, this may be avoided if a portion of the entire resistance is bridged by the condenser shown, so that the oscillations are damped by the part of the resistance which is not bridged, and steady conditions are ensured. If necessary, the bridging condenser should be omitted entirely, and a pure ohmic resistance employed, a condition which certainly would not occur very frequently. Owing to the increased damping on account of the connected resistance greater amplification is certainly required in order to control the luminous tube; however, this disadvantage must be accepted in view of the steady and satisfactory conditions obtained.
What I claim as new and desire to secure by Letters Patent is:
1. In a television system, a luminous tube having a positive column, a low frequency amplifier having an output tube,.a source of direct current in the anode circuit of said output tube, aresistance in series with said luminous tube in said anode circuit, and a condenser shunted across said source of direct current and a part of the said resistance.
2. In a television system, the combination of a low-frequency amplifier having an output valve,
a resistance and a positive-column luminous tube 5 having a descending characteristic of current and voltage connected in series with said resistance in the anode circuit of said output valve, a source of direct current in said anode circuit, and a condenser shunted across said source of direct cur- 10 rent and a part of said resistance, whereby that 7 part of the resistance not shunted by said condenser is adapted to damp commencing oscillations.
3. In a television system, the combination of a i5 low-frequency amplifier having an output valve,
a resistance and a positive-column luminous tube having a descending characteristic of current and voltage connected in series with one another in the anode circuit of said output valve, and a 20 condenser having one of its electrodes connected with the filament circuit of the output valve and having its other electrode connected to said resistance between the ends thereof, whereby only a portion of said resistance is shunted by said 25 condenser.
4. In a television system, the combination of a low-frequency amplifier having an output valve, a resistance and a positive column luminous tube having a descending characteristic of current and voltage connected in series with said resistance in the anode circuit of said output valve, a source of direct current in said anode circuit, and a condenser shunted across said source of direct current and a portion of said resistance, said condenser being adapted to be connected to diiierent points of said resistance, whereby the remaining unshunted portion of said resistance is efiective to damp commencing oscillations.
GEORG SCHUBER'DI'.
US625452A 1931-07-31 1932-07-28 Television system Expired - Lifetime US2026915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1931F0071552 DE692614C (en) 1931-07-31 1931-07-31 Circuit arrangement with light tubes with positive column for television purposes

Publications (1)

Publication Number Publication Date
US2026915A true US2026915A (en) 1936-01-07

Family

ID=25977802

Family Applications (1)

Application Number Title Priority Date Filing Date
US625452A Expired - Lifetime US2026915A (en) 1931-07-31 1932-07-28 Television system

Country Status (4)

Country Link
US (1) US2026915A (en)
DE (1) DE692614C (en)
FR (3) FR735144A (en)
GB (1) GB386563A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615978A (en) * 1947-10-14 1952-10-28 Motorola Inc Pulse width separation filter

Also Published As

Publication number Publication date
DE692614C (en) 1940-06-22
GB386563A (en) 1933-01-19
FR735144A (en) 1932-11-02
FR42047E (en) 1933-05-04
FR739207A (en) 1933-01-06

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