US2652514A - Display arrangement - Google Patents

Display arrangement Download PDF

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Publication number
US2652514A
US2652514A US180142A US18014250A US2652514A US 2652514 A US2652514 A US 2652514A US 180142 A US180142 A US 180142A US 18014250 A US18014250 A US 18014250A US 2652514 A US2652514 A US 2652514A
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US
United States
Prior art keywords
tubes
tube
cathode
characters
individual
Prior art date
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Expired - Lifetime
Application number
US180142A
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English (en)
Inventor
Davison Alan
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.)
Automatic Telephone and Electric Co Ltd
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Automatic Telephone and Electric Co Ltd
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Publication date
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
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Publication of US2652514A publication Critical patent/US2652514A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H04M3/64—Arrangements for signalling the number or class of the calling line to the operator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/525—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using tubes in the switching stages

Definitions

  • the present invention relates to display arrangements and is more particularly concerned with the display of variable items of information on the screen of a cathode ray tube.
  • Display devices of this type find many applications in. the signalling art, one particular application being to number displays used in automatic telephone systems.
  • the present invention is particularly concerned with display arrangements of the above-mentioned type and has for its object to provide an improved arrangement forv generating the characteristic varying potentials.
  • a thermionic tube or tubes of the rotating beam type in an arrangement for generating varying control voltages suitable for causing, any one or more of a plurality of predetermined characters to be displayed on the screen of acathode ray tube a thermionic tube or tubes of the rotating beam type is or are provided having load impedances associated with individual similar electrodes, the dimensioning of the load impedances being such that the current flow through the load impedances as they are rendered effective succcessively by the rotating beam enables a varying control voltage having a suitable characteristic to be obtained across a common portion of said load impedances.
  • a pair of varying control voltages is developed across two impedances each connected in the cathode.
  • circuit of separate thermionic tubes of the multi-anode rotating-beam type having an individual impedance of suitable value connected to each anode.
  • Fig 1 is a general circuit showing the principal components
  • Fig. 2 represents a multi-anode' rotating beam tube of the type used in the generating circuit.
  • the main circuit may be divided into three parts as follows. Part one consists of a layout control circuit which applies appropriate varying voltage successively to one pair of plates of a cathode ray tube and also D. C. layout potentials to another plate of the tube.
  • This equipment may consist of a uniselector LC as shown, having three banks of contacts, LCXI LCX2 and LCY.
  • the contacts of bank LCXI are connected over leads LP to different points of a potentiometer in such away that a difi'erent voltage appears on each contact, the voltages increasing progressively round the bank.
  • the wiper associated with this bank extends a voltage to one of the X plates-of the cathode ray tube and this voltage serves to locate the character in a desired position on the screen.
  • the contacts of the banks LCXZ and LCY are connected to a series of character selecting devices, and correspond to the X and Y components respectively of the characters to be displayed.
  • the wipers associated with thesetwo banks are therefore connected respectively to the second X plate and one of the Y plates of the cathode ray tube, the second Y plate being. connected to earth.
  • the second part of the circuit comprises the character selecting devices mentioned above. These may also consist of a plurality of uniselectors shown in the drawing as FSI, PS2, etc. As many of these uniselectorsmust beprovided as thereare characters to be displayed simultaneously. Furthermore, each must have two banks FSIX, FSIY etc., and eachbank must have as many contacts asthere are characters available, or alternatively further'uniselectors must-be pro-' vided so that the total number of contacts on all the uniselectors in the character selecting group is equal to twice the product of the number of different characters available and the maximum number of characters it isdesired to display simultaneously.
  • the Wipers corresponding to banks FSIX, FSZX etc; are-connected to successive contacts of layout control uniselector' LCXZ and those corresponding to-banks FSIY,
  • each comprises an electron discharge tube VIX, VIY, etc., of the multi-anode rotating beam type.
  • Each anode is connected to a source of high potential through a, resistor RI, R2, etc., and has in its cathode circuit a resistor RIX, RI Y, etc., connected between cathode and earth. Connections are made to the bank multiples of uniselectors FSI and PS2 from the cathodes of the rotating beam tubes as shown.
  • the values of the anode load resistors RI, R2, etc., are chosen for each tube so that, as the electron beam rotates, the current in each cathode resistor varies to provide the varying voltages required to trace the outline of the desired character on the screen of the cathode ray tube.
  • the rotating beam tube is shown diagrammatically in Fig. 2 and is of the type disclosed in British Specification No. 539,315 and in the The Bell System Technical Journal Vol. XXIII No, 2 April 1944 pp. 190-202. Only a brief description will be given here.
  • the tube consists of a single cathode I surrounded by a plurality of anodes I3, each of which has associated with it an individual grid H and is shielded from adjacent anodes by a screen i2.
  • a stator I5 of laminated mag- .netic material comprising a plurality of polepieces wound as for a polyphase A. C. motor.
  • a rotating magnetic field is produced which has the effect of focussing the electrons emitted from the cathode into a beam which rotates with the field.
  • Two beams are actually produced in opposite directions, but since only a single beam is required, one is suppressed by applying to the grids successively a potential negative with respect to cathode. This potential may be derived from the polyphase supply and thus the electrostatic field will rotate at the same rate as the magnetic field.
  • the shields between the anodes and the grids not biased to suppress the unwanted beam may be maintained at cathode potential and serve to suppress secondary emission from the anodes.
  • the grids may be connected in groups since the biasing potential may be applied to more than one grid simultaneously provided the group does not include the grid associated with the conducting anode.
  • An alternative arrangement in which the need for a stator is obviated employs a rotating electrostatic field only.
  • the grid associated with the conducting anode is raised to a positive potential while the remainder of the grids are biassed negatively with respect to cathode.
  • the principle of applying two varying potentials to a cathode ray tube to cause the beam to trace a character on the screen has been described in United States Application No. 750,142.
  • the beam is preferably deflected to trace the character and then to retrace it in the opposite direction. ihis eliminates fiy-back after each cycle and the consequent complications which would be required to black out that portion of the trace.
  • the required voltages may be determined as follows. The characters are first drawn on a pair of axes representing the deflection caused by the X plates and Y plates respectively, and then divided into a number of equal divisions representing fractions of the cycle.
  • the number of divisions should be equal to half the number of anodes in the rotating beam tubes since each figure is traced twice in each cycle, a suitable number of anodes being 20 per tube.
  • the X and Y co-ordinates of the centre point of each of the divisions may then be taken to represent the potentials which must be successively applied to the plates of the cathode ray tube to trace out the character, since the deflection is substantially proportional to the applied potential.
  • the varying potentials are obtained from the voltages developed across resistors RIX, RIY, etc.
  • the current in the cathode resistor varies, due to the rapid changes in anode load, and a capacitor CIX, CIY, etc., may be shunted across the cathode resistor to smooth out the changes in voltage so that a smoother trace is obtained on the cathode ray tube.
  • All the rotating beam tubes are in operation simultaneously and the varying potentials generated appear continuously on the contacts of the character selecting uniselectors FS.
  • the characters which are displayed on the screen of the tube are determined by the positions of the wipers of uniselectors PS I, F82, etc., which would, for example, be set by impulses from equipment external to that described.
  • the wipers of layout control uniselector LC rotate at a constant rate over as many of its contacts as are being used for the display.
  • the X and Y wipers apply to the appropriate plates of the cathode ray tube the two components of each character in turn.
  • a fourth bank of the uniselector FS could be used to apply locating potentials to the second Y plate instead of earth potential, in the same way as the wiper associated with bank LCXI applies locating potentials to the second X plate.
  • the beam of electrons in a multi-anode tube can be made to revolve at a much greater rate than a corresponding mechanical device, and hence an apparently simultaneous display of a greater number of characters could be obtained without flicker on the screen, which would preferably be of the slow type, than with a mechanical device.
  • a single stator could replace several used for individual tubes, and the output voltages would be developed across output resistors common to a set of anodes and disposed between the HT. supply and the junction point of the load resistors.
  • the generating tubes could be of the type having a plurality of cathodes and a single anode.
  • the uniselectors could be replaced by an arrangement of relays or other switching devices.
  • the invention provides an adaptable display device which has many applications in the signalling art. It is capable of displaying characters separately or in groups, and the characters may equally well be letters, figures or a combination of the two.
  • Apparatus for generating varying control voltages suitable for application to the deflecting means of a cathode ray tube to cause any number of a plurality of characters to be displayed on the screen thereof comprising at least one pair of thermionic tubes of the rotating beam type each having a plurality of individual similar electrodes, and individual load impedances connected to each individual electrode, a common load impedance for each tube connected in circuit with the individual load impedances for said tube, the dimensioning of said individual load impedances being such that the current flow through said individual load impedances as they are rendered eifective successively by the rotating beam enables a varying control voltage to be obtained from each of said common load impedances and means for applying said varying control voltages to said deflecting means.
  • each of said individual similar electrodes are anodes and including a single cathode in each of said tubes, the individual load impedances comprising a resistor connected to each of said anodes while the common load impedance comprises a common cathode resistor.
  • each of said thermionic tubes includes a plurality of sets of anodes comprised of the individual similar electrodes and wherein each tube has a single cathode for each of said sets of anodes.
  • each of said thermionic tubes comprise a plurality of cathodes and wherein each of said tubes has a single anode, the individual load impedances comprising a resistor connected to each of said cathodes while the common load impedance comprises a common anode resistor.
  • Apparatus for generating varying control voltages suitable for application to the deflecting means of a cathode ray tube to cause any number of a plurality of characters to be displayed on the screen thereof comprising a plurality of pairs of thermionic tubes of the rotating beam type, each tube having a plurality of anodes and a single cathode, an individual load impedance connected to each anode, a common load impedance connected to said cathode, the dimensioning of said individual load impedances being such that the current flow through said individual load impedances as they are rendered effective successively by the rotating beam enables a varying control voltage to be obtained from each common load impedance, a plurality of uniselectors each having a pair of wipers and associated bank contacts, connections between the bank contacts associated with one wiper of each of said uniselectors and the common impedance of a tube of each of said plurality of pairs of tubes and between the bank contacts associated with the other wiper of each of said uniselector
  • the apparatus claimed in claim 5 including a further wiper and associated bank contacts connected between a source of direct potential and said deflecting means whereby movement of said wiper over said contacts adds selected direct potentials to the deflecting means in conjunction with varying control voltage applied thereto by at least one of said uniselectors.
  • Apparatus for generating a multiplicity of varying control voltages comprising at least one pair of rotating beam type electron tubes each having a plurality of similar electrodes respectively electrically insulated and an individual electrode adapted successively to be in electrical connection with said similar electrodes through the medium of the rotating beam, a source of supply for said tubes, individual impedances respectively disposed between said source and said similar electrodes, a common impedance for each of said tubes connected between the individual electrode thereof and said source, and interconnected switching means in electrical connection with said common impedances for selecting varying control voltages developed thereacross in accordance with the instantaneous position of the rotating beam.
  • said interconnected switching means comprise a plurality of uniselectors each having a pair of wipers and associated bank contacts, connections between the bank contacts associated with one wiper of each of said uniselectors and the common impedance of one of said tubes and between the bank contacts associated with the other wiper of each of said uniselectors and the common impedance of the other of said tubes and including a further wiper and associated bank contacts connected to select successively potentials of different magnitude and add the selected potentials to said varying control voltages.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Television Scanning (AREA)
  • X-Ray Techniques (AREA)
US180142A 1949-09-14 1950-08-18 Display arrangement Expired - Lifetime US2652514A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2652514X 1949-09-14

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US2652514A true US2652514A (en) 1953-09-15

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US (1) US2652514A (de)
BE (1) BE497802A (de)
DE (1) DE861425C (de)
FR (1) FR1026828A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827590A (en) * 1955-05-17 1958-03-18 Burroughs Corp Multi-position switching systems
US2838706A (en) * 1954-02-18 1958-06-10 Raytheon Mfg Co Method and apparatus for electronic commutation
US2877376A (en) * 1955-09-06 1959-03-10 Itt Phosphor screen device
US2931936A (en) * 1958-12-08 1960-04-05 Philco Corp Character generating means for electronic information display systems

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114613A (en) * 1933-07-16 1938-04-19 Schlesinger Kurt Cathode ray tube
US2214729A (en) * 1939-08-31 1940-09-17 Rca Corp Magnetic field neutralizing system
US2247350A (en) * 1937-08-07 1941-07-01 Firm Of Fernseh Aktien Ges Cathode ray apparatus
US2302311A (en) * 1941-10-30 1942-11-17 Alfred N Goldsmith Electronic system
US2365476A (en) * 1943-05-11 1944-12-19 Du Mont Allen B Lab Inc Electronic switch and rectangular wave generator
US2395299A (en) * 1939-11-13 1946-02-19 Bell Telephone Labor Inc Electron discharge apparatus
US2512655A (en) * 1946-07-19 1950-06-27 Hans W Kohler Electrical apparatus
US2513947A (en) * 1946-08-14 1950-07-04 Gen Electric Co Ltd Multichannel signaling system
US2522055A (en) * 1945-12-31 1950-09-12 Gen Railway Signal Co Electronic translating device
US2533401A (en) * 1949-09-14 1950-12-12 Nat Union Radio Corp Coincidence detector of the focused rotary electron beam kind
US2534372A (en) * 1948-11-19 1950-12-19 Bell Telephone Labor Inc Cathode-ray device
US2573175A (en) * 1948-09-04 1951-10-30 Republic Aviat Corp Electronic signaling system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114613A (en) * 1933-07-16 1938-04-19 Schlesinger Kurt Cathode ray tube
US2247350A (en) * 1937-08-07 1941-07-01 Firm Of Fernseh Aktien Ges Cathode ray apparatus
US2214729A (en) * 1939-08-31 1940-09-17 Rca Corp Magnetic field neutralizing system
US2395299A (en) * 1939-11-13 1946-02-19 Bell Telephone Labor Inc Electron discharge apparatus
US2302311A (en) * 1941-10-30 1942-11-17 Alfred N Goldsmith Electronic system
US2365476A (en) * 1943-05-11 1944-12-19 Du Mont Allen B Lab Inc Electronic switch and rectangular wave generator
US2522055A (en) * 1945-12-31 1950-09-12 Gen Railway Signal Co Electronic translating device
US2512655A (en) * 1946-07-19 1950-06-27 Hans W Kohler Electrical apparatus
US2513947A (en) * 1946-08-14 1950-07-04 Gen Electric Co Ltd Multichannel signaling system
US2573175A (en) * 1948-09-04 1951-10-30 Republic Aviat Corp Electronic signaling system
US2534372A (en) * 1948-11-19 1950-12-19 Bell Telephone Labor Inc Cathode-ray device
US2533401A (en) * 1949-09-14 1950-12-12 Nat Union Radio Corp Coincidence detector of the focused rotary electron beam kind

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838706A (en) * 1954-02-18 1958-06-10 Raytheon Mfg Co Method and apparatus for electronic commutation
US2827590A (en) * 1955-05-17 1958-03-18 Burroughs Corp Multi-position switching systems
US2877376A (en) * 1955-09-06 1959-03-10 Itt Phosphor screen device
US2931936A (en) * 1958-12-08 1960-04-05 Philco Corp Character generating means for electronic information display systems

Also Published As

Publication number Publication date
DE861425C (de) 1953-01-05
FR1026828A (fr) 1953-05-05
BE497802A (de)

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