US2083205A - Safety means for television tubes - Google Patents

Safety means for television tubes Download PDF

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Publication number
US2083205A
US2083205A US747012A US74701234A US2083205A US 2083205 A US2083205 A US 2083205A US 747012 A US747012 A US 747012A US 74701234 A US74701234 A US 74701234A US 2083205 A US2083205 A US 2083205A
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United States
Prior art keywords
cathode
control electrode
potential
resistance
anode
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Expired - Lifetime
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US747012A
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English (en)
Inventor
Schlesinger Kurt
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Individual
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Individual
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Publication date
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Publication of US2083205A publication Critical patent/US2083205A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning

Definitions

  • the subject matter of the present invention is a means for safeguarding Braun tubes, and more particularly tubes for television purposes, against excess potentials occurring between control elec trode and cathode.
  • a glow-lamp 6 with small ignition potential arranged in such fashion that its one electrode is linked up with the control potential 2.
  • the other electrode of the glow lamp is connected with the cathode through the medium of a large condenser 9 of, say, 1 mf., and at the same time there is tapped at the resistance [0 of the mains-connection apparatus a bias of such nature that the glow lamp 6 is short 1y about to ignite.
  • the initiation of the safety arrangement may be adjusted by varying this tapping. With suitable selection of the ignition potential the tapping may also be connected in direct fashion with the most negative pole of the anode potential source, whereby the condenser 9 may be dispensed with.
  • a series resistance 1 in the path of the speech line 8 which resistance is preferably selected to be large as compared with the resistance of the glow lamp 6 when ignited but small as compared with the impedance between the control electrode 2 and cathode l (i. e., for example 1000- 5000 ohms). In this manner safeguarding is effected against excess potential without cutting off any part of the frequency band.
  • a Braun tube at least containing a cathode, a control electrode and an anode, said anode being connected to earth, said cathode being connected to a potential highly negative with respect to said anode, said control electrode being connected to a potential slightly negative with respect to said cathode, a condenser connected between said control electrode and one output terminal of said receiving amplifier, a second output terminal of said amplifier being connected to earth, said amplifier having a low output resistance, said glow lamp being connected between said control electrode and said cathode of said Braun tube.
  • the combination of 2. Braun tube, a receiving amplifier and a glow lamp said Braun tube at least containing a cathode, a control electrode and an anode, said anode being connected to earth, said cathode being connected to a potential highly negative with respect to said anode, said control electrode being connected to a potential slightly negative with respect to said cathode, a resistance and a condenser connected in series between said control electrode and one output terminal of said receiving amplifier, said resistance being large as compared with the resistance of the glow lamp when ignited but small as compared with the impedance between control electrode and cathode, a second output terminal of said amplifier being connected to earth, said amplifier having a low output resistance, said glow lamp being connected between said control electrode and said cathode of said Braun tube.
  • a Braun tube at least containing a cathode, a control electrode and an anode, said anode being connected to earth, said cathode being connected to a potential highly negative with respect to said anode, said control electrode being connected to a potential negative with respect to said cathode, a condenser connected between said control electrode and one output terminal of said receiving amplifier, a second output terminal of said amplifier being connected to earth, said amplifier having a low output resistance, said glow lamp being connected between said control electrode and said cathode of said Braun tube and means for biasing said glow lamp at a potential near the ignition potential for said lamp.
  • a Braun tube at least containing a cathode, a control electrode and an anode, said anode being connected to earth, said cathode being connected to a potential highly negative with respect to said anode, said control electrode being connected to a potential slightly negative with respect to said cathode, a resistance, and a condenser connected in series between said control electrode and one output terminal of said receiving amplifier, said resistance being large as compared with the resistance of the glow lamp when ignited, but small as compared with the impedance between control electrode and cathode, a second output terminal of said amplifier being connected to earth, said amplifier having a low output resistance, said glow lamp being connected between said control electrode and said cathode of said Braun tube, said resistance and said condenser being so selected that cutting ofi the frequency band of the receiving amplifier does not take place.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
US747012A 1933-10-11 1934-10-05 Safety means for television tubes Expired - Lifetime US2083205A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE446171X 1933-10-11

Publications (1)

Publication Number Publication Date
US2083205A true US2083205A (en) 1937-06-08

Family

ID=6537843

Family Applications (1)

Application Number Title Priority Date Filing Date
US747012A Expired - Lifetime US2083205A (en) 1933-10-11 1934-10-05 Safety means for television tubes

Country Status (4)

Country Link
US (1) US2083205A (enrdf_load_stackoverflow)
BE (1) BE405609A (enrdf_load_stackoverflow)
FR (1) FR779566A (enrdf_load_stackoverflow)
GB (1) GB446171A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267321A (en) * 1962-03-28 1966-08-16 Sylvania Electric Prod Electron discharge device having cathode protective means within the envelope
US3553522A (en) * 1968-10-30 1971-01-05 Westinghouse Electric Corp Electronic image device with protective circuit
US3810025A (en) * 1971-04-20 1974-05-07 Jeol Ltd Field emission type electron gun
US3921078A (en) * 1971-04-20 1975-11-18 Jeol Ltd Breakdown protection for field emission electron gun

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267321A (en) * 1962-03-28 1966-08-16 Sylvania Electric Prod Electron discharge device having cathode protective means within the envelope
US3553522A (en) * 1968-10-30 1971-01-05 Westinghouse Electric Corp Electronic image device with protective circuit
US3810025A (en) * 1971-04-20 1974-05-07 Jeol Ltd Field emission type electron gun
US3921078A (en) * 1971-04-20 1975-11-18 Jeol Ltd Breakdown protection for field emission electron gun

Also Published As

Publication number Publication date
BE405609A (enrdf_load_stackoverflow)
GB446171A (en) 1936-04-14
FR779566A (fr) 1935-04-09

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