US2552761A - Number display arrangement - Google Patents

Number display arrangement Download PDF

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Publication number
US2552761A
US2552761A US750142A US75014247A US2552761A US 2552761 A US2552761 A US 2552761A US 750142 A US750142 A US 750142A US 75014247 A US75014247 A US 75014247A US 2552761 A US2552761 A US 2552761A
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US
United States
Prior art keywords
characters
display
potentials
varying
voltages
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
US750142A
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English (en)
Inventor
Baker George Thomas
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
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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
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Publication of US2552761A publication Critical patent/US2552761A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/20—Cathode-ray oscilloscopes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
    • G09G1/08—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system
    • G09G1/12—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system the deflection signals being produced by essentially analogue means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L21/00—Apparatus or local circuits for mosaic printer telegraph systems
    • 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

Definitions

  • NUMBER DISPLAY ARRANGEMENT 7 File May 25. 1947 I e Sheet s-Shee t 2 I raw x 703) vauz) 'wm) m0 INVENTOR GEORGE THOMAS BAKER ATTORNE Y May 15, '1951- v G. T. BAKER 2 552,761.
  • The. present invention relates to display arrangements. and is more particularly concerned with arrangements. adapted to display: variable items. of information.
  • Display devices of this type find many applications. in the signalling art and the design of dis play devices suitable for the various applications has been a problem on which considerable time has been. spent without attaining a completely satisfactory solution.
  • One particular application is. to number display systems used in automatic telephone systems. 0ne form of display at pres-- entin use consists of a bank of lamps arrangedbehind a. stencil. plate, the lamps being divided into, for example, four groups of ten lamps to provide a four-digit display. -Thestencil platehas characters so that the whole display occupies a width of approximately 15 inches. This. display is not entirely satisfactory since the exaggerated spread together with. the variable horizontal and vertical displacement renders the numbers comparatively dimcult toread.
  • An other type of display such as used with totalisators employs a so-called monogrammic indicator in which the: characters are built up from small. elements but this is entirely unsuited for a small display.
  • monogrammic indicator in which the: characters are built up from small. elements but this is entirely unsuited for a small display.
  • mechanical solutions tothe problem using, for instance, number wheels, dial pointers and. so on but their chiefdrawback is the slowness of setting and further. they are often difficult to read, obsolete in space and are complicated in construction.
  • the movement of the spot is controlled by a combination: of varying character-producing potentialsand steady spacing or layout potentials.
  • varying potentials are-used to trace the outline offeachof saidcharacters and steady potentials ofapDlOpriate value are used to locate each of I the. characters at any. desired position on the screen.
  • electrostatic deflecting means areem-ployedfon' controlling the movement of the spotzand thecalternatingpotentialsare applied to the. deflection plates; It; will. however be understood that electromagnetic deflection may be used in which case the alternating potentials will be converted into alternaing currents for application to the deflecting coils.
  • predetermined-char acters-are adapted tobedisplayed by means of'a generator arranged to produce periodically-vary ing potentials suitablefor tracing the outlineof each of said characters, selection-of one'or more of the potentials being controlled by external means to cause one or more selected characters to be displayed on the screen.
  • an arrangementf'or displaying oneormore'bf a plurality of predetermined characters onthe screen of acathode ray tube comprises means for generating periodically varying potentials" suitable for producing a plurality of predetermined characters; means for selecting one or more of said alternating potentials as determined-bythe required characters and means for rendering efiective said alternating potentials to, produce the-desired display.
  • an alternating potential is applied to a plurality of impedances arranged to vary periodically in time to generate potentials suitable for producing said characters.
  • the invention has particular application to telephone systems in which information relating to a connection, for instance, the number of a calling and/or called subscriber or the duration of the call and so on, is transmitted to a central point where it is rendered available by a record or display.
  • the equipment in a telephone system provided with equipment for rendering available information relating to a connection, includes a cathode ray tube for causing the display of individual characters on the screen, the selection of a plurality of characters to display the desired information being effected in accord ance with impulses transmitted to the equipment.
  • Fig. 1 shows the layout of the main components
  • Fig. 2 shows the circuit of the varying voltage or figure generator
  • Fig. 3 shows the method of analysing a character
  • Fig. 4 shows a scale employed in determining the shape of the rotating vanes
  • Fig. 5 shows typical shapes of the vanes and Figs. 6 and 7 show two constructional views of the variable voltage generator.
  • Fig. 8 shows, in circuit diagram form, the schematic layout of the system, along the lines of Fig. 1, but more in detail.
  • the equipment comprises four main components, first the cathode ray tube CRO which may be any of the standard units, preferably of the slow screen type, of a size determined by the display requirements.
  • the second component is the layout control circuit LC which feeds the tube successively with the appropriate varying voltages or figure voltages over the leads OF to make up the display and superimposes the necessary steady potentials over the leads LP to locate each figure in the appropriate position in the frame or on the screen.
  • This equipment may consist of a uniselector as shown in the drawing together with a number of resistors and in many cases equipment already provided to serve other purposes may be used.
  • the uniselector is shown as having two wipers, one for successively feeding the fixed or locating potentials and the other for successively feeding the -X- and Y-varying voltages to the cathode ray tube. It will, of course, be understood that the drawing is purely diagrammatic and, in actual practice, the X- and Y-voltages would be fed over separate wipers of the uniselector as shown in Fig. 8.
  • the third component consists of the figure selector FS which, in actual practice would form part of the apparatus controlling the display.
  • this equipment may consist of a plurality of uniselectors as shown in Fig. 1 or 8 each of which feeds the appropriate X- and Y-voltages to the contact banks of the uniselector in the layout control circuit. If, for example, four characters are to be displayed, provision would have to be made for feeding four sets of X- and Y-voltages and four uniselectors would be necessary. These uniselectors would be set by means external to the equipment, for instance, by impulses transmitted thereto, the leads from the figure generator being multipled over the appropriate banks of the uniselectors.
  • the arrangement shown in Fig. l is purely diagrammatic in that each uniselector is shown as feeding both X- and Y-voltages to the layout control circuit.
  • the figure selectors may consist of groups of relays which selectively connect the contacts of the layout selector to appropriate terminals of the figure generator.
  • the fourth component consists of the figure generator FG which provides the alternating potentials for producing the trace corresponding to the integers, 1 to 0.
  • the figure generator FG provides the alternating potentials for producing the trace corresponding to the integers, 1 to 0.
  • One such unit will supply a large number of tubes and thus the system is particularly suited to providing a multiplicity of adjacent but otherwise independent displays.
  • the circuit of the figure generator is shown in Fig. 2.
  • the oscillator functions at about 500 kc., and feeds the common rotor of the multiunit variable condenser shown as CZX, C2Y, C3X, C3Y and so on.
  • Each fixed plate is connected through a load resistance RAZX, RAZY, RA3X, RA3Y and so on to earth.
  • the high frequency potential developed across the resistance is rectified by the appropriate one of the dry-plate rectifiers MRZX, MRZY, MR3X and MR3Y.
  • the smoothing units RBZX and CA2X and so on are introduced to prevent the highfrequency blurring the output, which is normally situated in the lower audio frequency band.
  • FIG. 6 Each figure with the exception of 1 requires two control potentials and there are thus nineteen plates and output terminals.
  • the actual construction of the figure generator is shown in Fig. 6 from which it will be seen to consist of a pressed steel base it provided with bearing brackets H and I2-which are secured to the base H) by screws I3 and I l.
  • the base [8 also carries a motor I5, secured to the base by screws [6, an oscillator IT shown in dotted outline and the various resistors and rectifiers [8 associated with the fixed capacitor blades and the capacitors l9 forming part of the smoothing circuits.
  • the motor I5 serves to drive the shaft 20 which by means of the insulating coupling 2
  • the shaft 22 is mounted in the brackets II and I2 by means of ball races 23 the latter being a push fit in phenol fibre insulating plates 24 suitably secured to the brackets by screws 32.
  • the shaft 22 carries the condenser vanes iY to HY, corresponding pairs of which e. g. 2X and ZY, are primed to metallic bushes 25 secured to the shaft 22 by retaining screws 25.
  • Intermediate metallic bushes 21 servev to separate each pair of vanes from adjacent pairs.
  • the rotating condenser vanes co-operate with one pair of fixed plates or blades 28 each pair being spaced apart by metallic distance pieces 29 and secured to insulating blocks 30 by screws 3i. It will be noted that in Fig. 7, which is an end view of Fig.
  • Equations 6 and. 7 can represent overlapping areas of the ca;
  • Equations 2 and 3 can be written.
  • the pe me e Qf t e o tin va e does not-cut the fixed blades in an arc of a circle, but in general, includes varying heights. actual area is represented by an integral takenbetween two radii, 18 deg. apart. Fortunately the sinefunctions and straight lines which compose the main part of the, figures integrate into sine functions and straight lines respectively, and therefore thiseffect does not entail a great deal of modification, except at discontinuities. One or more of these occur inmost figures and the reversals. at either end of the traverse provides further examples. A theoretically perfect solution cannot be obtained, but the shape of the figures are not critical and approximations can be obtained, which give a divergence from the ideal almost unnoticeable on the trace.
  • the applications of the display arrangement are many and will be obvious to those skilled in the signalling art. Reference has already been made to its application to automatic telephone systems either for displaying a called number or for displaying a calling number in systems employing line identification equipment.
  • the impulses or other signals representing such numbers would be transmitted to the equipment and would control, preferably directly, the switching mechanism of the figure selector.
  • the arrangement of the present invention may be employed in place of a recorder or printer by providing equipment for photographing each display, so that a permanent record is obtained of each display which in this case will consist of the particulars of a connection. It will be understood that other methods of controlling the figure selector than that shown diagrammatically in Fig. 8 are possible, and that under certain conditions all of the FS uniselectors could be set simultaneously from markings, rather than successively, from dialled impulses.
  • a generator for producing a steady alternating voltage wave of a single frequency
  • a plurality of variable impedances connected to said generator each having a rotatable element, said rotatable elements all having different configurations corresponding respectively to the outlines of the diiferent characters available for display
  • remote control means for selecting certain of said varying voltages, and automatic means for successively and repeatedly applying said selected voltages to said tube to cause the outlines of the corresponding characters to be traced and to be displayed side by side simultaneously by said tube.
  • a cyclically operating generator for producing a uniform alternative voltage Wave
  • a plurality of variable condensers connected to said generator each having a rotatable plate and afixed plate, all of saidrotatable plates provided respectively with different configurations corresponding to the outlinesof the difierent characters to be used
  • a shaft for repeatedly rotating said rotatable plates to cause said rotatable and fixed plates to convert said uniform alternating voltage into a plurality of varying alternating voltages corresponding respectively to said plate configurations
  • remote control means for selecting one or more of said varying unidirectional voltages at will
  • cyclically operating means for successively impressing said selected voltages on said tube at regularly repeated intervals to cause said tube to display the outlines of the corresponding characters simultaneously in laterally spaced apart relationship.
  • a display system as in claim 2 in which two condensers are normally employed for each of said difierent characters, to separately and simultaneously control the abscissa and ordinate values with respect to common base lines for each of said character outlines containing such values.
  • a generator common to said system for producing a steady alternating current of a single frequency, a plurality of variable condensers ccnnected to said generator, a metallic plate for each said condenser each hav-- ing a different peripheral configuration corresponding respectively to the abscissa and ordinate outlines of each one of the diiferent character outlines utilized in the system, said respective outlines traced alternately in opposite directions on each plate, means for rotating said plates in unison to cause said condensers to change said steady alternating current into a plurality of varying alternating currents corresponding to said peripheral configurations, means for automatically translating said.
  • varying alternating currents into correspondingly varying unidirectional potentials a first switching means for directively selecting a plurality of said last varying potentials, and a second switching means cyclically operated for successively applying said selected potentials to said oscillograph to cause the corresponding character outlines to be displayed simultaneously on said screen.
  • a generator common to said system for producing a uniform alternating voltage, a group of impedances connected to said generator, a metallic plate for each said impedance each having a different peripheral configuration corresponding respectively to the instantaneous abscissa and ordinate values constituting the out- -lines of the various numeral characters employed,

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US750142A 1946-06-12 1947-05-23 Number display arrangement Expired - Lifetime US2552761A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB267534X 1946-06-12

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US2552761A true US2552761A (en) 1951-05-15

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US (1) US2552761A (fr)
BE (1) BE473117A (fr)
CH (1) CH267534A (fr)
DE (1) DE830072C (fr)
FR (1) FR945893A (fr)
GB (1) GB624089A (fr)
NL (1) NL70916C (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2766444A (en) * 1953-09-01 1956-10-09 Eugene H Sheftelman Electronic character displaying apparatus
US2781508A (en) * 1952-05-01 1957-02-12 Eustace E Suckling Intelligence transmission system
US2875951A (en) * 1954-11-23 1959-03-03 Ibm Synchronization of display means to specific microsecond interval
US2931022A (en) * 1954-06-16 1960-03-29 Ibm Spot sequential character generator
US2989702A (en) * 1958-04-03 1961-06-20 Hoffman Electronics Corp Electronic generator of symbols or characters or the like
US3103658A (en) * 1958-01-13 1963-09-10 Ibm Character generation system
US3255443A (en) * 1961-01-27 1966-06-07 Le Febure Inc Cathode ray tube character or symbol generator having character boards containing potential dividers
US4027287A (en) * 1948-10-01 1977-05-31 Hale Bros. Associates Storage-controlled output device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039080A (en) * 1956-07-27 1962-06-12 Sperry Rand Corp Encoding device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1639000A (en) * 1924-01-04 1927-08-16 Western Electric Co Wave modulation
US2281350A (en) * 1940-04-10 1942-04-28 Ibm Number displaying device
US2363416A (en) * 1942-12-24 1944-11-21 Henroteau Francois Char Pierre Vehicle position indicating means
US2378383A (en) * 1942-10-17 1945-06-19 Brush Dev Co Transient signal recordingreproducing device
US2421747A (en) * 1943-07-14 1947-06-10 Bell Telephone Labor Inc Object locating system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1639000A (en) * 1924-01-04 1927-08-16 Western Electric Co Wave modulation
US2281350A (en) * 1940-04-10 1942-04-28 Ibm Number displaying device
US2378383A (en) * 1942-10-17 1945-06-19 Brush Dev Co Transient signal recordingreproducing device
US2363416A (en) * 1942-12-24 1944-11-21 Henroteau Francois Char Pierre Vehicle position indicating means
US2421747A (en) * 1943-07-14 1947-06-10 Bell Telephone Labor Inc Object locating system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027287A (en) * 1948-10-01 1977-05-31 Hale Bros. Associates Storage-controlled output device
US2781508A (en) * 1952-05-01 1957-02-12 Eustace E Suckling Intelligence transmission system
US2766444A (en) * 1953-09-01 1956-10-09 Eugene H Sheftelman Electronic character displaying apparatus
US2931022A (en) * 1954-06-16 1960-03-29 Ibm Spot sequential character generator
US2875951A (en) * 1954-11-23 1959-03-03 Ibm Synchronization of display means to specific microsecond interval
US3103658A (en) * 1958-01-13 1963-09-10 Ibm Character generation system
US2989702A (en) * 1958-04-03 1961-06-20 Hoffman Electronics Corp Electronic generator of symbols or characters or the like
US3255443A (en) * 1961-01-27 1966-06-07 Le Febure Inc Cathode ray tube character or symbol generator having character boards containing potential dividers

Also Published As

Publication number Publication date
CH267534A (fr) 1950-03-31
GB624089A (en) 1949-05-27
NL70916C (fr)
DE830072C (de) 1952-01-31
BE473117A (fr)
FR945893A (fr) 1949-05-17

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