US2215285A - Television apparatus - Google Patents

Television apparatus Download PDF

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Publication number
US2215285A
US2215285A US557244A US55724431A US2215285A US 2215285 A US2215285 A US 2215285A US 557244 A US557244 A US 557244A US 55724431 A US55724431 A US 55724431A US 2215285 A US2215285 A US 2215285A
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US
United States
Prior art keywords
ray
cathode ray
tube
deflecting
picture
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
US557244A
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English (en)
Inventor
Randall C Ballard
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Priority to US557244A priority Critical patent/US2215285A/en
Priority to GB20826/32A priority patent/GB392383A/en
Priority to FR740658D priority patent/FR740658A/fr
Priority to NL62114A priority patent/NL42664C/xx
Priority to GB29596/34A priority patent/GB447403A/en
Application granted granted Critical
Publication of US2215285A publication Critical patent/US2215285A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04N3/24—Blanking circuits

Definitions

  • next line Its return path, referred to as the horizontal return line, causes an objectionable light trace on the screen. Upon reaching the bottom of the picture, the beam must return to the top in order to scan the next picture.” Again, its return path, referred to as the vertical return line, is visible as an undesirable light trace on the screen.
  • One of the objects of my invention is to eliminate these undesirable return lines.
  • Another object of my invention is to provide aniimproved television system wherein better contrast in the picture is obtained than has been possible under similar operating conditions, with the various systems proposed heretofore.
  • a cathode ray tube forms part of the receiving station.
  • electrical eifects developed locally in an operating circuit of this station, incidental to normal operation thereof, are utilized to substantially cut off the ray during predetermined intervals.
  • a television receiving station including a cathode ray tube and means for deflecting the ray horizontally and vertically
  • electrical effects developed incidental to the operation of the ray-deflecting means, are utilized to substantially cut off the ray during the return periods in both the scribed and claimed.
  • Figure l is a diagrammatic view of a television receiving system embodying my invention
  • Fig. 2 is an elevational view, looking toward the left in Fig.1;
  • Fig. 3 is a diagrammatic view, illustrating a modification.
  • the receiving station in Fig. l is of the same general type disclosed in the copending application by Arthur W. Vance, Serial No. 544,959, and filedJune 17, 1931,.now Patent No. 2,137,939 granted Nov. 15, 1938.
  • the picture signals and the horizontal and vertical synchronizing iin pulses are taken from the resistances Ni, ii, and l2 connected in parallel to the output terminals of a suitable radio receiver iii.
  • the same are taken from the resistance lllby an associated contact M, and applied by way of a condenser It to the grid of a cathode ray tube ll. 4 and the electron-emitting cathode l9, and the grid N5 of this tube are supplied with the usual oper' ating potentials, as indicated.
  • the ray 20' is caused to scan a fluorescent screen at the large end of the tube, and along a path similar to that shown in Fig. 2, that is, along a saw-tooth path from the point 22 to the point 23, and thence along 'a vertical return path it back' to the starting point 22.
  • the ray is deflected horizontally by electromagnetic coils 25 connected across the output terminals of a suitable source 26 which causes a saw-tooth current wave of the desired frequency to pass through these coils.
  • the ray is deflected vertically by electromag--- netic coils 21 connected across the output terminals of a suitable vertical source 28 which causes a saw-tooth current wave of the desired frequency to pass through these coils.
  • the horizontal synchronizing impulses taken from the resistance H by an associated contact 29' and applied to the source 26, and the vertical synchronizing impulses taken from the resistance l2 by an associated contact 30 and applied to the source 28. operate in the well known manner to maintain deflection of the ray 20 in synchronism with operating action at the transmitting station.
  • the voltage wave .across the vertical deflection coils 2'! comprises positive impulses occurring once every picture frame. These impulses occur during vertical deflection of the ray 20 from the point 23 back to the starting point 22.
  • the usual anode iii For the purpose of utilizing these impulses to cut off the ray during this period, and thus eliminate the vertical return line 24, the voltage wave across the coils 21 is applied to the grid circuit of a suitable amplifier 33 through a connection 34 from the plate circuit of the last tube in the vertical deflection source 28.
  • the voltage wave in the plate circuit of the amplifier 33 is the same shape as the voltage wave across the coils 21', but 180 degrees out of phase-therewith and, therefore, comprises negative impulses occurring once every picture frame.
  • This reversed wave is applied to the grid l6 by a connection 36.
  • the negative voltage impulses occurring between the picture frame periods are thereby made efiective to impress a negative bias on the grid I6 of sufficient amplitude to substantially cut off the ray 20 during the vertical return line period.
  • the vertical return line 24 is thereby eliminated.
  • the voltage wave across the horizontal deflecting coils 25 is utilized in a simi lar manner.
  • This voltage wave appears in the plate circuit of the last tube in the horizontal deflection source 26, and comprises positive voltage impulses occurring at a frequency equal to that of the horizontal scanning frequency.
  • This wave is reversed by a suitable amplifier 40 and applied to the grid E6 of the tube l7 through the connection 36.
  • the coils 42 and 43 are connected in series, respectively, with the coils 25 and 21, and
  • the last tube of this amplifier may be used in lieu of and serve the same purpose as the amplifiers 33 and 40 in Fig. 1, in which case the connection 36 would supply the grid circuit of this last tube by a suitable connection.
  • the deflection sources 26 and 28 are constructed or adjusted so that the voltage Waves across the coils 25 and 2'! are of the proper polarity, these waves can be impressed directly on r the grid circuit of the tube H, or at a reduced amplitude on the grid circuit of the amplifier tube forming part of the receiver l 3 and which is sec- 0nd in line from the tube l1. In either case, the voltage impulses impressed on the control grid I 6 will be negative, and efiective accordingly to cut ofi the ray 2! to eliminate the return lines 24 and 31.
  • the electrical wave for controlling elimination of the ray may be taken from any suitable circuit forming part of the receiving station, and impressed on another circuit to efiect the desired control action.
  • the voltage waves in the plate circuits of any suitable stages in the deflection sources 26 and 28, may be utilized.
  • the receiving station embodies a cathode ray tube, and wherein electrical effects are developed locally in an operating circuit of the receiving station to substantially cut ofl the cathode ray during predetermined intervals.
  • a cathode ray tube forms part of the receiving station and operates to reproduce the transmitted picture
  • the method of operation which comprises receiv ing picture and synchronizing signals, developing a a cathode ray and directing the same at a. screen, deflecting the ray to cause it to scan the screen, developing under the control of the received synchronizing signals electrical impulses independently of the transmitting station and locally in an operating circuit of the receiving station, and utilizing said impulses to substantially cut off the cathode ray at predetermined intervals during the scanning action.
  • a cathode ray tube forms part of the receiving station, and wherein means is provided for deflecting the ray to cause the same to scan screen structure; the method of operation which comprises developing a cathode ray and directing the same at the screen structure, deflecting the ray to cause it to scan the screen structure utilizing electrical effects developed incidental to operation of the raydefiecting means to substantially cut off said ray during a predetermined period in the ray-deflecting cycle.
  • cathode ray apparatus In a television receiving system, cathode ray apparatus, screen structure on which a picture is reproduced, means for causing scanning movement of the ray, and means controlled by said first-named means for eliminating the return lines which would otherwise be visible incidental to the scanning action.
  • cathode ray apparatus having screen structure on which a picture is reproduced, means for causing the ray to scan said structure along substantially hori-- zontal and vertical return lines in the scanning cycle, and means controlled by said first-named means and operating to suppress the ray to eliminate said lines.
  • cathode ray apparatus for reproducing a picture.
  • means including an electron tube for supplying said apparatus with'picture signals, means ior causing scanning movement of the ray, and means also including said tube controlled by said second named means to suppress the ray during a predetermined period in the scanning cycle.
  • cathode ray apparatus for reproducing a picture, screen structure forming part of said apparatus, means including an electron tube for supplying said apparatus with picture signals, and ray deflecting means for causing the ray to scan said structure and operating to supply the grid circuit of said tube with electrical impulses efiective to cause suppression of the ray during a predetermined period in the scanning cycle.
  • cathode ray apparatus for reproducing a picture and provided with a screen, electromagnetic coils for deflecting the ray across said screen, means including an electron tube for supplying said apparatus with picture signals, means for energizing said deflection coils and causing electric current of substantially saw tooth wave form to flow therethrough'to deflect the cathode ray, and'aconnection for impressing on the grid circuit of said tube a voltage wave representing substantially a first derivative of the current flowing through said coils.
  • the method of operation which comprises developing negative voltage. impulses locally at the receiving station and independently of the received picture signals, and supplying the impulses so developed to said circuit during periods when the ray is not effective for picture-reproduction purposes, supplying picture signals to the grid circuit of the tube, and deflecting the ray to cause it to scan the screen.
  • a cathode ray tube forms part of the receiving station and operates to reproduce the transmitted picture
  • the method of operation which comprises receiving picture and synchronizing signals, developing a cathode ray and directing the same at a screen, deflecting the ray to cause it to scan the screen, developing, at the receiving station, electrical impulses independently of the transmitting station, but under the control thereof and locally in an operating circuit of the receiving station, and
  • cathode ray apparatus is employed to reproduce a picture and wherein means including an electrical system comprising at least one tube is employed to cause the electron ray developed wthin the scanning apparatus to scan a target element in reproducing the picture
  • the method of operation which comprises directing the electron ray upon the target element, deflecting the electron ray under the control of the energy in the electrical system to cause the ray to scan the target element, and utilizing a portion of the voltage wave in the output circuit of the electrical system used for deflecting the my to render the ray substantially non-effective with respect to the target element during predetermined periods in the scanning cycle.
  • cathode ray apparatus wherein a cathode ray is developed, electrode structure, means for directing the developed ray toward the electrode structure, means for causing the ray to scan said structure, and means controlled by said first-named meansior rendering the ray substantially non-effective during predetermined periods in the scanning cycle.
  • cathode ray apparatus wherein a cathode ray beam is developed, electromagnetic means for deflecting the ray, means for causing a sawtooth current wave to flow through said ray-deflecting means, means including an electron tube for supplying said apparatus with picture signals, and a connection for impressing on the grid circuit of said tube a voltage wave which substantially represents a first derivative of the current wave flowing through said ray-deflecting means.
  • a cathode ray tube having therein means to develop a cathode ray beam and a control electrode to control the intensity of the cathode ray beam is utilized and wherein the developed cathode ray beam is deflected to scan a predetermined area
  • the method of operation which comprises directing the developed cathode ray beam toward the predetermined area, developing electrical energy for deflecting the cathode ray beam according to a predetermined deflection pattern to cause it to scan the predetermined area, developing negative voltage impulses under the control of the said developed electrical energy locally at the receiving station and independently of received signals, supplying the impulses so developed to the control electrode circuit of the cathode ray tube at predetermined and substantially identical time intervals in each scanning cycle to substantially suppress the cathode ray during the said periods.
  • cathode ray apparatus having therein means to develop a cathode ray is utilized, and wherein means including a multi-stage electron tube system are employed to cause the ray to scan electrode struc-' ture contained within the tube; the method of operation which comprises developing a cathode ray and directing the same at the electrode structure, deflecting the ray to cause it to scan the electrode structure, and utilizing the voltage wave in the plate circuit of one of the tubes comprising said system .to render the ray substantially nonefiective with respect to said structure during predetermined periods.
  • cathode ray apparatus wherein cathode ray apparatus is utilized, and wherein the ray is deflected by an electrical system comprising at least one electron tube; the method of operation which comprises developing a cathode ray and directing the same at a screen, deflecting the ray to cause it to scan the screen, and. utilizing the voltage wave in the plate circuit of said tube to control the intensity of said ray.
  • cathode ray apparatus provided with a target element, complementary elements for deflecting the ray back and forth across said target element, a generator of an electrical wave comprising at least one electron tube, means for supplying said electrical wave to said deflecting elements, means for controlling the intensity of the ray, and means connectedbetween said control means and the plate circuit of a tube of said generator to suppress the ray during predetermined periods of the deflection thereof.
  • a system for deflecting electron passage in a cathode ray tube comprising in combination a cathode ray tube provided with electron passage deflecting elements and a fluorescent plate, saw tooth voltage generating means consisting of a condenser connected with a direct current source to be charged thereby at a substantially constant rate and a vacuum valve connected across the terminals of said condenser for short circuiting said condenser periodically, means for generating periodical impulses which are used to control the discharge of said short circuiting valve, and means actuated from the deflecting means and in circuit with said deflecting element and associated with the grid circuit of said cathode ray tube for eliminating the return path of the image on the fluorescent plate.
  • cathode ray apparatus including structure activated by the ray, means for causing scanning movement of the ray over said structure, and means controlled by said first named means for eliminating return lines which would otherwise be visible at the receiver incidental to the scanning action.
  • cathode ray apparatus wherein a cathode ray beam is developed, means including at least one electron tube for deflecting the ray, and means for controlling the ray intensity in accordance with the voltage wave in the plate circuit of said tube.
  • the method of scanning a picture area with a cathode ray beam which comprises exposing said said beam to the influence of a scanning current which would normally cause said beam to repeatedly traverse said area in two directions, and utilizing a derivative of said current to sub stantially extinguish said beam in one direction of its traverse of the area.
  • a method of scanning a picture area with a cathode ray beam which comprises exposing said beam to the influence of a scanning current which would normally cause said beam to repeatedly traverse said area relatively slowly in one direction and relatively rapidly in anotherdirection, and deriving energy impulses from the scanning current for substantially extinguishing said beam during the rapid portion of the cycle.
  • a cathode ray device including an electron gun for projecting a concentrated cathode 'ray beam of substantially elemental cross-sectional area at the point of impact upon a target element positioned to receive the beam and to respond thereto at the area of beam impact, means to cause traversal of the cathode ray beam across the target, and means controlled by the first named means for eliminating the return lines which would otherwise cause undesired response from the target element.
  • a cathode ray device including an electron gun for projecting a concentrated electron beam of substantially elemental cross-sectional area at the point of impact upon a target element positioned to receive the beam and to respond thereto at the area of beam impact, means to normally cause traversal of the cathode ray beam across the target along a sub- 33.
  • a cathode ray device In combination with a cathode ray device.
  • an electron gun for projecting a concentrated cathode ray beam of substantially elemental cross-sectional area at its point of impact upon a bi-dimensional target element positioned to receive the beam and to respond thereto at the area of beam impact, means to deflect the said beam so as normally to cause a back and forth traversal of the target by the said cathode ray beam in one plane of motion, a second means to deflect the said beam so as normally to cause a back and forth traversal of the target by the said cathode ray beam in a substantially mutually perpendicular plane of motion at a rate substantially slower than the deflection in the first plane of motion, each of said beam deflections relative to the target at the two rates following a.
  • a cathode ray device having an electron gun for projecting a concentrated cathode ray beam of substantially elemental cross-sectional area upon a target element positioned to receive the beam and to respond thereto as the area of beam impact the .
  • method steps which comprise developing electrical energy to cause a traversal of the cathode ray beam across the target along a substantially saw-tooth pattern, and deriving electrical energy from the energy developed to control the beam traversal for eliminating the return lines which would otherwise cause undesired response from the target.
  • the method steps which include normally deflecting the said beam to cause a back and forth traversal of the target thereby in one plane of motion, normally deflecting the said beam to cause a back and forth traversal of the target thereby in a substantially mutually perpendicular plane of motion at a rate substantially slower than the deflection in the first plane of motion, controlling the beam deflections relative to the targetso that the deflections occur at two difierent rates and so that al and a complete lei-dimensional traverse occurs only after a pre-determined number of beam deflections at the more rapid rate, and controlling the beam under the influence oi the deflection control so as to eliminate the beam return traces normally occurring during the back traversal in.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)
US557244A 1931-08-15 1931-08-15 Television apparatus Expired - Lifetime US2215285A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US557244A US2215285A (en) 1931-08-15 1931-08-15 Television apparatus
GB20826/32A GB392383A (en) 1931-08-15 1932-07-23 Improvements in or relating to television and like systems
FR740658D FR740658A (fr) 1931-08-15 1932-08-02 Perfectionnements aux systèmes de télévision et aux modes d'utilisation de ceux-ci
NL62114A NL42664C (fr) 1931-08-15 1932-08-04
GB29596/34A GB447403A (en) 1931-08-15 1934-10-16 Improvements in or relating to television and like systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US557244A US2215285A (en) 1931-08-15 1931-08-15 Television apparatus
GB29596/34A GB447403A (en) 1931-08-15 1934-10-16 Improvements in or relating to television and like systems

Publications (1)

Publication Number Publication Date
US2215285A true US2215285A (en) 1940-09-17

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Application Number Title Priority Date Filing Date
US557244A Expired - Lifetime US2215285A (en) 1931-08-15 1931-08-15 Television apparatus

Country Status (4)

Country Link
US (1) US2215285A (fr)
FR (1) FR740658A (fr)
GB (2) GB392383A (fr)
NL (1) NL42664C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2534557A (en) * 1949-01-19 1950-12-19 Tele Tone Radio Corp Keystoning circuit
US2607847A (en) * 1949-11-08 1952-08-19 Motorola Inc Vertical retrace blanking
US2957043A (en) * 1958-03-28 1960-10-18 Kihn Harry Scanning system for cathode ray tubes
US3066183A (en) * 1959-05-06 1962-11-27 Philips Corp Television receiver control circuit responsive to distorted signals

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755468C (de) * 1934-11-06 1954-11-22 Opta Radio A G Schaltungsanordnung zur Erzeugung von zur Strahlunterdrueckung in Fernsehkathodenstrahlroehren dienenden Sperrimpulsen
DE885097C (de) * 1935-04-03 1953-08-03 Telefunken Gmbh Schaltungsanordnung fuer mit Spulenablenkung arbeitende Braunsche Roehren zum Empfang von Fernsehsendungen
DE755742C (de) * 1935-07-08 1953-05-26 Telefunken Gmbh Schaltungsanordnung zur Sperrung eines mit Spulen abgelenkten Kathodenstrahles waehrend seines Ruecklaufes in Fernsehsendern und -empfaengern
DE743024C (de) * 1938-08-06 1943-12-16 Fernseh Gmbh Einrichtung zur Sperrung des Kathodenstrahls

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2534557A (en) * 1949-01-19 1950-12-19 Tele Tone Radio Corp Keystoning circuit
US2607847A (en) * 1949-11-08 1952-08-19 Motorola Inc Vertical retrace blanking
US2957043A (en) * 1958-03-28 1960-10-18 Kihn Harry Scanning system for cathode ray tubes
US3066183A (en) * 1959-05-06 1962-11-27 Philips Corp Television receiver control circuit responsive to distorted signals

Also Published As

Publication number Publication date
GB447403A (en) 1936-05-18
GB392383A (en) 1933-05-18
NL42664C (fr) 1938-03-15
FR740658A (fr) 1933-01-27

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