US2226996A - Television receiver - Google Patents

Television receiver Download PDF

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Publication number
US2226996A
US2226996A US39467A US3946735A US2226996A US 2226996 A US2226996 A US 2226996A US 39467 A US39467 A US 39467A US 3946735 A US3946735 A US 3946735A US 2226996 A US2226996 A US 2226996A
Authority
US
United States
Prior art keywords
anode
potential
tube
television
relaxation
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
US39467A
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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 RADIO Inc
Original Assignee
LOEWE RADIO Inc
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 RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2226996A publication Critical patent/US2226996A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
    • 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
    • H04N5/68—Circuit details for cathode-ray display tubes

Definitions

  • the invention rel'atestothesupply of anode D. C- potentials to complete television receivers which comprise a radio receiver in combination with a cathode-ray television tube andan appertaining relaxation oscillation generator.
  • a receiving system of thiskind there has usually been performed heretofore in practice a distribution of thecurrent supply over two transformers, of
  • the supply section I, 2, 4 operates in accord: ance with the invention in half-wave connection, whilst the anode potential section 3 operates in full-Wave "connection; This is possible because the requirement for anode potential on thepart' of the screen apparatus and thQ'BI'HiLlI].
  • tube is comparatively smalljg
  • an anode potential of ,700 volts is sufficient for the relaxation oscillation generator. This'is already obtained at theterminal 6 when the winding 2 in effect has merely '500volts'.
  • the condensers Ill.v and II therefore, .merely require to withstand the diiference in potential between 9 and 6, and to not break down.
  • variable impedance 32 ispr'ovided in the lead connection to the relaxation oscillationgenerator apparatus 2
  • this impedance preferably of the form of an ohmic resistance an independent regulation of the proportion of the image brightness on the one hand and of the size of the image on the other hand may be performed.
  • an adjustment of the anode-potentials for the relaxation generators may be performed without variation of the anode potentials for the Braun tube.
  • the Braun tube I2 is connected with an earthed cathode I3 earthed through a condenser 30, and its anode I4 is raised to a positive high tension against earth.
  • the deflecting plates I5 and I6 are preferably connected within the tube with the anode by means of fixed resistances I! and I8.
  • may be accommodated with advantage in the high vacuum of the television tube l2 in order to render impossible a breakdown of these condensers operating with a working potential of almost 2000 volts.
  • the time circuits l9/l'l and 18/20 should be selected with consideration to the relaxation frequencies to be transmitted thereto.
  • the condensers become small and handy the larger the leakage resistances l1 and I8 are capable of being made, and these, particularly in the case of a negative bias between plates and anode and location in a vacuum, may amount to 1 megohm. In this case the transmission of relaxation oscillations with 25 image changes is already quite successful with a capacity of 0.05 M. F. v
  • connection system not only are fluctuations in the potential of the television anode counterbalanced by fluctuations of equal size and equal direction in the anode potential of the scanning apparatus, but also the humming potentials of both circuits 6 and 9 compensate each other there belong also co-phasal low anode potentials of 21, so that the form of image is always confined by straight lines. Owing to this natural compensation the smoothing required (22/ l I) may be kept so low that the loss of potential at the condenser l I as compared with ID remains less than 2%.
  • connection of the grid cathode circuit of l2 with the final tube of the receiver, the rectifier 24 According to theinvention there is selected also v in this case a bridge connection for steadying the grid circuit andfor adjusting the correct mean value of the light'intensity.
  • This consists of the final tube 24 with its anode resistance 25 on the one hand and the potentiometer 26 on the other hand.
  • the latter may be operated from the exterior, or may also be mechanically coupled with the switch for switching on or ofi the receiver. Even with traces of ripple at the smoothing capacity 21 no humming stripes occur in the image, because the grid bias of the television tube is situated in the bridge diagonal to 21, and the ripple potential in the anode feed for the receiver is accordingly eliminated in the control circuit for the intensity.
  • two-way rectification 3 3 is, in accordance with the invention, retained in this part of the rectifier for the purpose of effecting economy in smoothing means.
  • the heating of the television tube I3 is derived from a 4-volt winding 28, which is preferably also wound on to the common heating transformer 29, supplying the heating filaments of all tubes operating in the receiver.
  • An interfering hum in the winding supplying the heating voltage for the television tube is prevented by a capacity 30.
  • a power supply system including a pair of input terminals adapted to be energized from a source of alternating current voltage, a transformer having a primary and a secondary winding, a connection from the primary winding to the input terminals to supply energy to the primary winding and to cause energization of the secondary winding, a pair of half-wave rectifier tubes, a connection from the end terminal of the secondary winding to the anode and cathode elements of one of the rectiflers, a connection from an intermediate point on the transformer secondary winding and one end terminal of the said winding to the anode and cathode of the other rectifier with the said other rectifier being connected in opposite polarity to the first rectifier

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
US39467A 1934-08-08 1935-09-06 Television receiver Expired - Lifetime US2226996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER91381D DE747931C (de) 1934-08-08 1934-08-08 Stromversorgungsgeraet fuer Fernsehempfaenger

Publications (1)

Publication Number Publication Date
US2226996A true US2226996A (en) 1940-12-31

Family

ID=7991155

Family Applications (1)

Application Number Title Priority Date Filing Date
US39467A Expired - Lifetime US2226996A (en) 1934-08-08 1935-09-06 Television receiver

Country Status (3)

Country Link
US (1) US2226996A (fr)
DE (1) DE747931C (fr)
FR (1) FR794645A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418133A (en) * 1943-06-18 1947-04-01 Western Electric Co Cathode-ray apparatus and method of controlling the ray
US2472209A (en) * 1944-09-06 1949-06-07 William M Hall Cathode-ray circuit
US2567861A (en) * 1946-01-07 1951-09-11 Robert M Silliman Cathode-ray beam intensity control
US2783412A (en) * 1954-03-15 1957-02-26 Rca Corp High voltage supply
US2975327A (en) * 1958-12-02 1961-03-14 Philips Corp Circuit for avoiding too low a potential difference between control grid and cathode of a cathode-ray tube
US3522468A (en) * 1967-11-01 1970-08-04 Teltron Inc Image orthicon comprising cathode,control grid,and target serially connected by internal resistances

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE103388C (fr) *
DE598243C (fr) *
DE450555C (de) * 1923-12-14 1927-10-10 Wilhelm Hahn Dipl Ing Schaltanordnung fuer Empfangsgeraete und Verstaerkergeraete mit Elektronenroehren zum Anschluss an Starkstromnetze

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418133A (en) * 1943-06-18 1947-04-01 Western Electric Co Cathode-ray apparatus and method of controlling the ray
US2472209A (en) * 1944-09-06 1949-06-07 William M Hall Cathode-ray circuit
US2567861A (en) * 1946-01-07 1951-09-11 Robert M Silliman Cathode-ray beam intensity control
US2783412A (en) * 1954-03-15 1957-02-26 Rca Corp High voltage supply
US2975327A (en) * 1958-12-02 1961-03-14 Philips Corp Circuit for avoiding too low a potential difference between control grid and cathode of a cathode-ray tube
US3522468A (en) * 1967-11-01 1970-08-04 Teltron Inc Image orthicon comprising cathode,control grid,and target serially connected by internal resistances

Also Published As

Publication number Publication date
DE747931C (de) 1944-10-20
FR794645A (fr) 1936-02-21

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