US1962447A - Picture receiver - Google Patents

Picture receiver Download PDF

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Publication number
US1962447A
US1962447A US430766A US43076630A US1962447A US 1962447 A US1962447 A US 1962447A US 430766 A US430766 A US 430766A US 43076630 A US43076630 A US 43076630A US 1962447 A US1962447 A US 1962447A
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US
United States
Prior art keywords
current
cells
thermionic
distributer
over
Prior art date
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Expired - Lifetime
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US430766A
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English (en)
Inventor
Karolus August
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
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RCA Corp
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Filing date
Publication date
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Publication of US1962447A publication Critical patent/US1962447A/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
    • H04N3/12—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by switched stationary formation of lamps, photocells or light relays
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18144—Overcoming dead center

Definitions

  • the invention is concerned with the transmission of static or still pictures, or of moving pictures, and more particularly with the case where scanning or exploration and re-creation are effected not by movements of luminous points or diaphragme, but rather by the switching of cellscreens.
  • the picture surface consists of rows of points comprising photo-electric cells (selenium, or photo-cells) for the transmitter apparatus and luminescent cells, such as glow-discharge lamps, for the receiver apparatus, while switches rotating in synohronism and under cophasic conditions are provided so as to take care that homologous cells of the row are interconnected. Between the two change-over switches are to be inserted the amplifier and transmission means.
  • change-over switches of this kind may consist of current-distributers driven by a motor.
  • One or more slip brushes in rapid alternation make contact with contacts which are associated with the respective groups or with separate elements.
  • inertialess switching devices are known whereby cell screens disposed in the interior of vacuum tubes in a way known from the Braun tube are to be switched over by moving pencils of electrons, these pencils of electrons being set into rotation, for example, bythe action of a rotary magnetic field.
  • the mechanical change-over switches of the kind rst named are unsuited for ne picture screens which comprise a great number of cells, on the ground that the dimensions and circumferential speeds would have to be inadmissibly high where so many contacts are needed.
  • the main disadvantages reside in the fact that the cell screens including all of their contacts, insulated surfaces, etc. have to be accommodated inthe interior of thermionic tubes, and this would be attended with considerable difliculties as regards assembling of the tubes and their treatment from a vacuum or evacuating viewpoint.
  • the present invention obviates the above named difficulties by providing a combination of a mechanical and an electronic change-over switch, in such manner that the former effectsV the circuit-changes "or change-over between groups of cells (which changes proceed at a relatively low rate of speed), while the latter insures the distribution of current over the constituent elements of each cell group or bank, an opera- Germany, assigner to merlca, ⁇ a corporation of 1930, Serial N0. 430,766 ⁇
  • FIG. 1 of the drawing illustrates one embodiment which is shown by way of example, and Fig. 2 discloses a modification of Fig. 1.
  • the cells comprising photoelectric cells for the transmitter and glow-discharge vessels for the receiver apparatus, are arranged in vertical groups, being respectively denoted by Roman numerals I, II, III, etc., while the place or position of each individual element inside a given group is designated by Arabic numerals 1, 2, 3, etc. Only a small number of the total cells has been designated.
  • the receiving circuit is here fed with D. C., although it could be supplied also with A. C. 20 denotes the mechanical, and
  • the former has disposed upon its periphery T many stationary contacts 9, 9, 9, etc. at equal inter- 80 vening distances, while opposite thereto rotates V a star 01 spider of (r-D many distributer contacts 10, 10', 1G", etc., all of the latter forming equal angles between themselves.
  • a star 01 spider of (r-D many distributer contacts 10, 10', 1G", etc. all of the latter forming equal angles between themselves.
  • the electronic change-over switch 21 is furnished with 90 anodes 11, 11', 11", etc., of a number equal to r, uniformly distributed over the circumference, said anodes being coordinated to the respective places of elements l, 2, 3, etc., as can be readily seen from the drawing.
  • the pencil of electrons, 12, issuing from a common cathode 13 and striking the electrodes 11, l1', 1l", and whose intensity is governed by the intensity of the picture signal (for which purpose there are used controlling means well known in the prior art), is set into rotation by defiector coils 14, l5, and 16,
  • the mechanical change-over switch 20 need not be designed in a way as here shown. Indeed, its place may be taken by an ordinary distributer comprising a single circulating or rotating contact member, though in this instance the speed of rotation must be r times higher.
  • the cathode-ray tube (electronic tube) 21 needs to have only r lead-ins brought to the electrodes 11, 11', 11", etc., contradistinct from what is true of earlier suggestions where all of the cells are switched in and out by purely electronic means and where T2 lead-ins are furnished in order to establish connection with the cell screens located outside the tube.
  • This simplification is insured in the present invention by combining the mechanical group or bank switch with an electronic change--over device for the individual cells.
  • a mediately acting electronic distributer arrangement may be used in which the cathode ray-pencil subject to intensity control by the receiver, does not carry the operating current of the cell screen, but serves merely as a path of least resistance for releasing the working current.
  • the instantaneously varying charges set up by the rotating electron pencil at distinct control electrodes For instance, the rotating cathode ray-pencil controlled in its intensity by the incoming current may be used to more or less charge up negatively grid electrodes of amplier systems.
  • This potential difference acts in the form of a counter E. M. F. in the circuit of the luminous cell and its source. Since the counter E. M. F. diminishes as the control electrodes are charged up negatively, a correspondingly reinforced current impulse associated with greater brightness is made to flow across the luminous cell.
  • the grid electrode of course, together with the cathode coordinated to it must be united by a high resistance in order that unduly fast leaking away of the negative charge must be precluded.
  • FIG. 2 A somewhat diiferent circuit arrangement is shown in Fig. 2 in which of the groups of luminous cells only banks I, II and III are illustrated, while inside these only cells 1 and 2 are indicated.
  • the group supply leads are united with the contacts 9, 9', 9, etc. of the mechanical change-over switch 10 by which the current is able to flow from the positive pole of the source 18 through the particular luminous cell which happens to be in circuit.
  • the rotating electron pencil l2 impinges upon the distributer electrodes 1l, 11', 11 con-- fined inside the vacuum vessel, from which leads are brought to the control grids 36, 37, which are associated with the coordinated cathodes 38, 39, by way of high resistance 40, 41.
  • These amplifier systems should most suitably be provided with a high reciprocal amplification factor so that, in the state of rest or when unenergized, a comparatively strong current will iiow by way of the anodes 32, 33 through the resistances 34, 35.
  • the plate current source for supplying plate current through anodes 32, 33, shown, is denoted by 31, while 30 designates the joint heating battery for all of the amplifier cathodes 38, 39, etc.
  • a biasing potential is taken off for the control grids 24, 25, which govern the fiow of thev current of the luminous cells.
  • the anodes 22, 23, and the hot cathodes 26, 27 are provided.
  • a brightening current of regulated intensity will be caused to flow from the positive pole 18 by way of the distributer arm 10, contact 9 glowdischarge cell l in group III, plate 22 and lament 26 to the return conductor 19 united with the negative battery poie.
  • the diiferent inter-electrode gaps will thus be opened up as the cathoderay pencil 12 travels over the distributer electrodes in a way free from sluggishness, so that the flashing up of the various cells along a bank can be accomplished at a high rate of speed.
  • a television system a plurality of image producing points, a plurality of independently energizable sets of conductors arranged in intersecting patterns and having one of said image producing points connected at each intersection,
  • thermionic device connected with each conductor of one of said sets, means for normally preventing current flow through said thermionic devices in the absence of impressed signals thereon,
  • an inertialess controlling element for energizing sequentially thermionic device to produce trigger action in accordance with received signals so as to supply controlled currents to each of the conductors of one of said sets in sequence, and mechanical means for limiting the effect of said l 1,962,447 supplied energy to a single point of each of said conductors.
  • a plurality of image producing points a plurality of independently energizable sets of conductors arranged in intersecting patterns having one of said image points connected at each intersection, a thermionic relay device connected with each conductor of one of said sets, a second thermionic relay device connected with each of said first-named thermionic devices, means for normally maintaining each of said second-named thermionic devices in an operative state, means normally responsive to a current oW through each of said operative thermionic devices for biasing each of said rstnamed thermionic devices to cut-off, a cathode ray instrumentality for inuencing each of said second-named thermionic relay devices sequentially for biasing said amplifiers in sequence to substantially a cut-off point for increasing the flow of current through each of said first-named thermionic relay devices so as to sequentially pass current through each conductor of one of said sets, and a mechanical means for selecting the point at which the current
  • a plurality of light producing elements arranged at the intersection of a plurality cf conductors arranged in the form of abscissi and ordinates Whose concurrently energized intersections determine the instantaneous light values produced from said elements, means for sequentially energizing the abscissa conductors at predetermined rate, a iirst thermionic relay connected with each ordinate conductor, a second series of normally operative thermionic relays having the output circuit connected With the input circuit of each rst thermionic relay to bias each rst thermionic relay normally to cut-off during periods of operation of each second relay, and an electronic means for sequentially triggering the relay of the second series so as to reduce the space current through the relays of the second series and thereby render the relays of the first series operative in sequence to pass current through the ordinate conductors.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US430766A 1929-03-08 1930-02-24 Picture receiver Expired - Lifetime US1962447A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE350959X 1929-03-08

Publications (1)

Publication Number Publication Date
US1962447A true US1962447A (en) 1934-06-12

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ID=6265473

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Application Number Title Priority Date Filing Date
US430766A Expired - Lifetime US1962447A (en) 1929-03-08 1930-02-24 Picture receiver

Country Status (4)

Country Link
US (1) US1962447A (enrdf_load_stackoverflow)
FR (1) FR691586A (enrdf_load_stackoverflow)
GB (1) GB350959A (enrdf_load_stackoverflow)
NL (1) NL30226C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474960A (en) * 1945-04-28 1949-07-05 Nat Union Radio Corp Electronic device and circuit arrangement therefor
US2622153A (en) * 1948-10-15 1952-12-16 Teletype Corp Multiplex telegraph system utilizing electronic distributors
US2684449A (en) * 1946-03-19 1954-07-20 Raytheon Mfg Co Commutator tube
US3205483A (en) * 1948-10-01 1965-09-07 Dirks Gerhard Matrix device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE868447C (de) * 1937-06-15 1957-10-10 Interessengemeinschaft Fuer Ru Verteilernetz fuer hochfrequente Impulsfolgen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474960A (en) * 1945-04-28 1949-07-05 Nat Union Radio Corp Electronic device and circuit arrangement therefor
US2684449A (en) * 1946-03-19 1954-07-20 Raytheon Mfg Co Commutator tube
US3205483A (en) * 1948-10-01 1965-09-07 Dirks Gerhard Matrix device
US2622153A (en) * 1948-10-15 1952-12-16 Teletype Corp Multiplex telegraph system utilizing electronic distributors

Also Published As

Publication number Publication date
FR691586A (fr) 1930-10-23
NL30226C (enrdf_load_stackoverflow)
GB350959A (en) 1931-06-10

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