US2096985A - Television - Google Patents

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Publication number
US2096985A
US2096985A US607720A US60772032A US2096985A US 2096985 A US2096985 A US 2096985A US 607720 A US607720 A US 607720A US 60772032 A US60772032 A US 60772032A US 2096985 A US2096985 A US 2096985A
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US
United States
Prior art keywords
line
image
plates
condenser
potential
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
US607720A
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English (en)
Inventor
Ardenne Manfred Von
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 US2096985A publication Critical patent/US2096985A/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
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H04N3/32—Velocity varied in dependence upon picture information

Definitions

  • Fig. 1 An arrangement of this natura is illustrated in Fig. 1, while Figs. 2, 3 and 4 illustrate further modifications described in detail hereafter.
  • Fig. l l is a film, which it is assumed is advanced line by line in a direction vertical 110 the plane of the drawing. 011 thls film there is reproduced through the medium of a lens 2 the fluorescent spot moving on the screen 3 of a cathode ray tube 4.
  • This tube possesses a cathode 5, a Wehnelt cylinder 6, an anode I and a pair of deflecting plates 8. Behind the film I there may be provided a mal; screen 9, so that the ray of light passing dlfiusely through the same controlsa photo-cell III.
  • the photo-cell current is amplified by an amplifier II, and controls the valve I 2, through the medium of which the condenser I3 situated in parallel with the pair of deflecting plates 8 is charged by the potential source I I.
  • a glow lamp I5 In parallel with the condenser I3 there is a glow lamp I5, through the medium of which, when its ignition potential has been reached, the condenser I3 is discharged, whereby the scanning of the line commences afresh. In this manner the same image appears on the screen 3 of the valve 4 which was scanned on the film I, either as positive 01' negative dependent on the polarity.
  • the condenser I3 in order to avoid this, is charged through the medium of the relatively constant internal resistance of a tilting apparatus supplying a saw-tooth potential, whereby the charging operation is retarded by a photo-modulated multiple electrode valve situated in parallel with the condenser I3.
  • a modulation of this nature is preferably obtained by intensity-modulated Braun tubes in which the pairs of plates to be employed as the modulated resistance result in a resistance, which from a practical standpoint, is independent of the conditions of the circult be modulated.
  • Fig. 2 similar elerhents are furnished. with like reference charactersto Flg. 1.
  • the condenser I3 is charged by the battery I4 through the medium of a saturated. diode IG especially with ionic discharge. II; is necessary to employ a saturated ionic valve in orcler I;o obtain a linear charging cu1ve of the condenser.
  • the charging of the condenser is retarded by the parallel tube I! controlled by the amplifier I I.
  • a modulation of imageyand line slmilar to this is performed in the case of the arrangement according to Fig. 3.
  • This figure corresponds with Fig. 2, whereby, however, there is added the con- 50 trol of the image potential.
  • This is effected by means of the tilting apparatus I8, which in slmilar fashion to that for the line potential, may consist of a potentlal source, a saturated diode, a charging condenser and a glow discharge space. 55
  • ThIs is to be accomplished with the greatest advantage II.
  • the llne and Image potentials are modulated by a Braun tube.
  • 2l and 22 are 1Ine or Image tilting apparatus, the potentlals of whlch are applled to the deflecting plates of the Braun transmission or receiving taube.
  • the modulatlon occurs by reason of the intenslty controlled flow of electrons between the pairs of deflectlng plates 25 and 2G, for instance by varlation 015 the potential o1 the Wehnelt cylinder 21 of thls tube.
  • the pairs of deflecting plates 25 and 26 are Set so close together that the fluctuating flow of electrons through the pairs of plates provides the modulation of the Image and line potentials.
  • the degree of-modulation ls adjusted by sultable internal resistances of the Image and line tilting apparatus.
  • the use 015 the Braun tube as couductlvity modulator has the appreclable advan tage that the conductivitles between its pairs of plates are, from a practical standpoint, wholly indepenclent of the conditions of the clrcult to be controlled.
  • valves I1 and 20 are preferably con- Ing deflectlng voltages 02 saw tooth wave form connected to seid deflecting means, a photo cell, a modulator resistance connected to sald photooell and In parallel to said generator, said reslstance serging for modulatlng said deflectlng voltages proportional to the photo cell voltages VaryIng with the llght falllng upon said photo cell, sald reslstance being approxlmately independent 015 the working condltions of said deflect- Ing voltage generator and said deflectlng means, sa.id resistance being constituted by the shunt resistance of two plates o1 a second Braun tube, comprising cathode, anode
  • a television transmission device comprls- Ing a Braun tube having cathode, anode, deflect- Ing means and a fluorescent screen, means for developing a cathode ray, two generators 1or pro- -duclng deflectlng voltages 015 saw tooth wave form, one for llne deflection and.
  • the other one for Image deflection connected to sald deflectlng means, a photo cell, two modulator resistances, each connected to said photo cell and in parallel 1:0 each of seid generators, said resistances servlng for modulatlng each sald dellectlng voltages proportional to the photo cell voltages varylng with the llght falllng upon said photo cell, said resistances being approximately Independent cf the working conditions 015 sald deflectlng voltage generators and said deflectlng means, said resista;n ces being constituted by the shunt reslstances of two palrs of plates of a second Braun tube, comprisixig cathode, anode, two pairs of condenser plates and light intensity control means connected to Sald photo cell, the varylng value of said resistance being determined by the strength of the cathode ray passing through sald plates of said second Braun tube.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US607720A 1931-04-29 1932-04-27 Television Expired - Lifetime US2096985A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2096985X 1931-04-29

Publications (1)

Publication Number Publication Date
US2096985A true US2096985A (en) 1937-10-26

Family

ID=7984763

Family Applications (1)

Application Number Title Priority Date Filing Date
US607720A Expired - Lifetime US2096985A (en) 1931-04-29 1932-04-27 Television

Country Status (2)

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US (1) US2096985A (fr)
FR (1) FR736029A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474628A (en) * 1948-05-20 1949-06-28 Hurvitz Hyman Indicator
US2528020A (en) * 1945-07-24 1950-10-31 Philco Corp Mask controlled feedback system for cathode-ray tubes
US2540016A (en) * 1948-03-17 1951-01-30 Philco Corp Electrical system
US2556455A (en) * 1948-03-02 1951-06-12 Rauland Corp Cathode-ray tube focusing system
US2557691A (en) * 1949-03-19 1951-06-19 Geovision Inc Electronic function generator
US2559492A (en) * 1948-02-28 1951-07-03 Rca Corp Scanning control system
US2711479A (en) * 1950-08-30 1955-06-21 Philco Corp Video mapping system
US3130341A (en) * 1960-05-27 1964-04-21 Gen Electric Rapid response semiconductors

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2528020A (en) * 1945-07-24 1950-10-31 Philco Corp Mask controlled feedback system for cathode-ray tubes
US2559492A (en) * 1948-02-28 1951-07-03 Rca Corp Scanning control system
US2556455A (en) * 1948-03-02 1951-06-12 Rauland Corp Cathode-ray tube focusing system
US2540016A (en) * 1948-03-17 1951-01-30 Philco Corp Electrical system
US2474628A (en) * 1948-05-20 1949-06-28 Hurvitz Hyman Indicator
US2557691A (en) * 1949-03-19 1951-06-19 Geovision Inc Electronic function generator
US2711479A (en) * 1950-08-30 1955-06-21 Philco Corp Video mapping system
US3130341A (en) * 1960-05-27 1964-04-21 Gen Electric Rapid response semiconductors

Also Published As

Publication number Publication date
FR736029A (fr) 1932-11-18

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