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US2872669A - Cathode ray character tracer - Google Patents

Cathode ray character tracer Download PDF

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Publication number
US2872669A
US2872669A US423502A US42350254A US2872669A US 2872669 A US2872669 A US 2872669A US 423502 A US423502 A US 423502A US 42350254 A US42350254 A US 42350254A US 2872669 A US2872669 A US 2872669A
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US
United States
Prior art keywords
tube
cathode ray
character
patterns
screen
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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
US423502A
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English (en)
Inventor
Reynold B Johnson
Jr William C Dersch
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International Business Machines Corp
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International Business Machines Corp
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Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US423502A priority Critical patent/US2872669A/en
Priority to GB10442/55A priority patent/GB786092A/en
Priority to FR1142376D priority patent/FR1142376A/fr
Priority to DEI10098A priority patent/DE1099242B/de
Application granted granted Critical
Publication of US2872669A publication Critical patent/US2872669A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • This invention relates to electric apparatus and systems for character forming, and more particularly to high speed cathode ray character tracers.
  • One object of this invention is to provide an improved apparatus for tracing legible characters in accordance with code signals applied to the apparatus.
  • means are provided to sweep a plurality of related character synthesizing patterns simultaneously whereupon a plurality of voltage wave forms, or voltage variations, corresponding to the configurations thereof are generated so as to control a character tracing device.
  • the sweep effected by means of a fan-shaped, or band-shaped, cathode ray beam has a single basic scanning movement so that the plurality of related character synthesizing patterns are caused to be scanned only once for each character being traced.
  • the cathode ray beam is further positioned in response to code signals in order to sweep selected related character synthesizing patterns.
  • Another object of this invention is to provide apparatus for scanning in a selected order a plurality of related character patterns simultaneously.
  • Another object of this invention is to provide apparatus for tracing a character consequent upon a single sweep or deflecting movement of a cathode ray beam to thereby effect a single scan of a plurality of related character patterns.
  • Figs. la and lb taken together, are a block diagram of the preferred embodiment for character tracing.
  • Fig. 2 shows a plurality of related character representing synthesizing patternswhich are scanned simultaneously, the particular one shown being thus used for deriving voltages for representing the digit 5.
  • Fig. 3 is a graph of the digit 5 with various plotting points indicated thereon.
  • trigger circuits are referred to; and more particularly, triggers are described as being either on or off. Due to the nature of the trigger which may comprise two reciprocally resistance coupled vacuum tubes, the trigger is maintained at one of two stable conditions, termed on and 013?. When the left side of the trigger is conducting, the trigger is arbitrarily described as being on. When the right side of the trigger is conducting, the trigger is arbitrarily described as being 01f.
  • a plurality of sequentially coupled triggers form a ring wherein the said triggers are rendered on successively by suitable succeeding voltage pulses.
  • the last trigger is coupled to the first trigger so that the first trigger is rendered on as the last trigger is rendered off, the ring is more accurately termed a closed rlng.
  • the point upon the screen of a cathode ray tube at which a cathode ray beam impinges is controlled by voltages applied to defiect ion plates, or coils, associated with the said tube.
  • defiect ion plates, or coils associated with the said tube.
  • the intensity of the electron beam in a cathode ray tube may be controlled by varying the bias voltage applied to its control grid.
  • the electron beam is referred to as being either on or oif.
  • the cathode ray tube electron beam strikes its related screen so that energy radiations are emitted therefrom, the electron beam is arbitrarily described as being on.
  • the electron beam fails to cause energy radiations to 'be emitted from its screen, the electron beam is arbitrarily described as being ofii.
  • a multivibrator 10 gencrates timed parent voltage pulses which are changed to square wave voltage pulses by a clipper 11, and amplified by a power vacuum tube circuit 12.
  • Output voltage pulses from circuit 12 render triggers included within closed primary timer ring 13, on, in a timed relation corresponding to the timed pulses generated by'multivibrator 10.
  • the triggers within ring 13 are coupled sequentially to form a closed ring so that the said triggers are rendered on successively; i. e., for each voltage pulse applied to the said ring, a trigger is rendered on as its preceding trigger is turned 0
  • Primary timer ring 13 in the embodiment of this invention comprises nine sequentially connected triggers.
  • a correspondingly timed voltage impulse is transmitted to powervacuum tube circuit 14 so as to render the power amplifier tube therein conducting.
  • a resulting amplified output voltage impulse from circuit 14 is transmitted simultaneously to character selector X and Y rings 15 and 16, respectively.
  • Each one of the closed X and Y rings includes seven sequentially connected triggers which are rendered on successively; i. e., for each voltage impulse transmitted from circuit 14, one trigger within each of the rings 15 and 16 is turned on as its preceding trigger is turned d, and the rings are referred to as having advanced one step.
  • each of the X and Y rings and 16 there is associated with each of the X and Y rings and 16, a respective power unit 27 and 18 each of which includes a power tube and associated circuit to correspond with each trigger in the aforementioned rings.
  • a power tube within units 17 and ibis caused to conduct when its corresponding trigger is turned on.
  • the tubes within each of the power units are rendered conduct ing successively in step with their corresponding triggers. Due to the fact that the component values of the aforementioned power unit powertube circuits differ for each power tube the potential output due to any one conducting power tube is of a correspondinglydifferentl
  • These power tube output voltages fromunits 1.7 i are applied to electron beam positioning circuits and 26', respectively, associated with selector cathode ray tube 21.
  • Positioning circuit 13 is, in effect, a voltagerniner circuit such that the output voltage'from the positioning circuit H is due to the combinative voltages transmitted from a sweep circuit 22 and amplifier circuit 5-iassociated therewith, and power unit 17, also associated with the said positioning circuit.
  • Positioning circuit normally serves as an amplifier for the output signals from unit 13.
  • the output voltages from positioning circuits 19 and 20 are applied to the horizontal, or X, and vertical, or Y, electron beam deflection plates within selector tube 21.
  • the position of an electron cathode ray beam upon the screen of its cathode ray tube is controlled by the potentials applied to the deflection plates or coils associated with the tube.
  • the position of the racing pattern upon the screen of tube 21 is determined by the magnitude of the output voltages from positioning circuits 19 and 20.
  • the magnitude of the output voltage from a positioning circuit is determined by the magnitude of the output voltage from the aforementioned conducting power tube within the power units 17 and 18.
  • the voltages applied to the electron gun or selector tube 21 are such as to cause a fan-shaped, or band-shaped, light beam to be emitted from the fluorescent screen of tube 21 when the said tube is turned on.
  • This light beam is directed along three paths towards a light sensitive phototube positioned in each path.
  • One light beam path is defined by lens 23, light beam splitters 24- and 2-3, mask 26, collector lens 27, and phototube 28.
  • Another path is defined by lens 23, beam splitter 24, half-silvered surface 29, mask 30, collector lens 31, and phototube 32.
  • the third path is defined by lens 23, half-silvered surface 33, mask 34, lens 35, and phototube 35.
  • Phototubes 36, 23 and 32 are associated via respective amplifier circuits 38, 39 and 40 with the X, Y and Z controls, respectively, of character viewing tube 37 as will be described shortly.
  • the varying voltage outputs of amplifiers 38, 39 and 455 cause a character to be traced on the screen of viewing tube 37.
  • Such a character may be recorded by any suitable means, such as camera 41.
  • Each of the masks 26, 30 and 3 5 includes a plurality of character representing patterns, such as are shown in Fig. 2.
  • Each character representing synthesizing patternin a mask consists of transparent and opaque configurations arranged so as to vary the amount, or intensity, of light energy impinging upon a related phototube.
  • Each of these patterns is disposed within an area of the mask which is proportional to an area of the screen on tube 21 covered by the aforementioned tracing pattern.
  • the embodiment of this invention is capable of handling forty-nine characters; namely, twenty-six alphabetic characters, ten numeric characters and thirteen special characters.
  • each of the aforesaid masks is divided into forty-nine areas so as to form seven rows by seven columns of character representing synthesizing patterns.
  • Each of the fortynine patterns in mask 26 is used to control the Y defiection plates of tube 37, whereas each of the patterns in mask 34 is used to control the X deflection plates of this tube.
  • the patterns in mask 30 are used to govern the Z control of tube 37.
  • each of the elements in the aforedescribed three optical paths are arranged so that at any given time the light beam from the screen of tube 21 impinges upon a corresponding region of masks 26, 3t) and 34.
  • the light beam impinges upon the extreme left-hand region of area (see Fig. 1a) which is situated in the first row of the first column in mask 34, the light beams of approximately equal intensity will impinge concurrently upon the extreme left-hand portions of corresponding areas 45 and 47 in masks 26 and as, respectively.
  • the mask areas 45, 6 and 4-7 may be formed in any suitable manner.
  • apertures may be formedin a plate with eachaperture having a configuration which corresponds to a predetermined voltage wave form. T he individual voltage wave forms for controlling the horizontal and vertical deflection of the cathode ray beam may be plotted beforehand in accordance with .the particular style of character desired.
  • the matrix of apertures may then be photographed to produce masks Z6, and 34, wherein the apertures themselves will be transparent while the rest of the mask will be opaque.
  • a voltage impulse is directed to an associated amplifier circuit.
  • the magnitude of this .voltage impulse is determined by the intensity of light energy impinging upon the phototube.
  • a varying voltage output may be had by varying the light input to the phototube.
  • mask areas 45, 46 and -i7 are situated in the first row of thepfirst column in masks 34, 26 and 36 ⁇ , respectively.
  • the shaded parts in each of the areas 45, and 47 is the opaque pattern, whereas the remaining parts are transparent. Since the width of the light beam generated by tube 21 is caused to equal the height of each of the patterns, by referring to Figs. 2 and 3, it may readily be seen that by a fan-shaped light beam to sweep across p areas 45, 46 and 47, simultaneously, the digit 5" may be traced.
  • the X control pattern in area 45 causes the amount of light energy impinging upon its en the associated phototube 36 to vary, and accordingly, causes the voltage output from phototube 36 to vary and the electron beam in tube 37 to move horizontally from a to b. Since light energy is permitted to impinge upon phototube 32 between the limits a and b, the viewing cathode ray tube 37 is turned on and the path of the cathode ray beam within tube 37 between a and b is rendered visible. However, during the period between b and (see Fig.
  • the viewing tube beam is turned off while the voltages applied to the deflection plates associated therewith cause the beam to move in a clockwise direction, as is indicated by the broken line, to prepare for the sweep between pattern limits c and a.
  • the Z blanking control is provided to improve the sharpness and quality of the character being traced, and to prevent an over-trace. It may be seen that at limit c the electron beam in tube 37 is turned on. in view of the fact that the amount of light impinging upon phototube 36 between limits 0 and d is a constant, the voltage applied from this phototube to the X deflection plates viewing tube 37 is also constant between limits 0 and d (see Fig. 3). However, the light energy variation applied to phototube 23 is such to cause the lower Y deflection plate to become more positive. Accordingly, the cathode rays in tube 37 are moved downwardly from c to d.
  • the electron beam is once again turned off as is indicated by the broken line.
  • the electron beam is turned on and the voltages applied to the X and Y deflection plates are such as to cause the eiectron beam in tube 37 to trace a substantially circular path.
  • the electron beam is turned ofl so that the beam may be moved to g which is the starting point, a. It may be seen that if the patterns in areas 45, 4t: and 47 are scanned again, the digit 5 will be retraced.
  • a blanking voltage is applied to character selector cathode ray tube 21' (Figs. la and lb) in order to render its electron beam 0 during the time that the electron beam is shifted from the end of one character representing synthesizing pattern to the start of another pattern.
  • Gate circuit 43 includes a trigger which is connected to timer ring 13 so that the trigger in gate circuit 48 is turned off when the last trigger in ring 13 is turned 0 and is turned on when the second trigger in ring 13 is turned on. It is to be recalled that primary timer ring 13 includes nine sequentially connected triggers. Hence, the trigger in gate circuit 48 is rendered on foreight multivibrator pulses, and off for one pulse. As ring 13 is a closed ring, these nine multivibrator pulses advance said ring once around.
  • a suitable voltage is caused to be applied to X sweep circuit 22. This voltage biases the sweet circuit sufficient- 1y to prevent an output sweep voltage therefrom. This voltage is also applied to the Z control of tube 21 in order to render its electron beam otf.
  • This voltage biases sweep circuit 22 so as to render the same operative, whereby one sawtooth wave is gen erated during the period that trigger 2 through 9 in ring 13 are on.
  • the electron beam of tube 21 is being moved under control of position units 19 and 2i).
  • oneninth of timer ring 13 time is utilized to position the beam, and eight-ninths of timer ring 13 time is used to trace a character.
  • the fan-shaped light beam emitted from the screen of tube 21 may be caused by focusing'the cathode ray beam therein to a fan-shape.
  • the focusing controls are, of course, included within the electron-gun of this cathode ray tube.
  • Thisfan-shaped light beam may also be generated by moving a spot type cathode ray beam rapidly along the Y axis of a rectangular, or plane, coordinate system. This generator is indicated by Y sweep 53 (Fig. 1b). Due to the persistency of the fluorescent screen, a single fan-shaped light beam wili appear.
  • a closed ring 49 similar to rings 15 and 16, is advanced one step for each impulse from circuit 14.
  • rings 15, 16 and 49 are advanced one step in unison.
  • Power unit 50 includes a power tube and associated circuit to correspond with each trigger in ring 49. Since the electrical component valuesof these power tube circuits differ for each power tube, the potential output from unit St) is different for each power tube therein which is conducting. The components selected are such as to cause successive tracings to appear in sequential order across the face of tube 37.
  • ring 4-9 is a closed ring, and since it includes seven triggers, seven tracings appear in sequential order.
  • the voltage output from unit 50 is applied to a mixer circuit 51 wherein the output from amplifier 38 and unit 49 are combined to cause a representative voltage to be applied to the X deflection controls of tube 37.
  • Lens 52 is used to direct each of the seven tracings on the screen of tube 37 towards recording camera 41.
  • a first cathode ray tube comprising means for producing first cathode rays and a screen having theproperty of emitting light rays under the influence of said cathode rays, a plurality of masks each having a plurality of character synthesizing patterns defined by areas of transparent and opaque configurations positioned in optical relationship to said screen so that said light rays impinge upon corresponding ones of said patterns in different ones of said masks concurrently, a plurality of light ray sensing means for producing Voltages associated with said masks and positioned so that each one of said sensing means is influenced by said light rays passing through a mask associated therewith, cathode ray deflecting means associated with said first cathode ray tube for causing said first cathode rays to sweep a region of said screen proportional'to one of said pattern areas whereby said light rays sweep corresponding pattern areas in said masks simultaneously, a second cathode ray tube comprising
  • said cathode ray deflecting means associated with said first cathode ray tube includes positioning means for causing said first cathode rays to sweep in a selected order a plurality of regions of said first cathode ray tube screen corresponding to a plurality of mask areas representing tracings to be recorded.
  • a device additionally comprising cathode ray positioning means associated with said second cathode ray tube for selectively positioning sue cessive tracings in a sequential order across said recording screen.
  • a device additionally comprising means for applying a predetermined blanking voltage to said first cathode ray tube and said deflecting means associated therewith.
  • a data recording device comprising an electron discharge device including means for producing cathode rays and a screen having the property of emitting energy radiations under the influence of said cathode rays, radiant energy sensing means for producing voltages positioned so as to be influenced by said energy radiations, a plurality of character representing patterns disposed in rows and columns relative to said screen for controlling the intensity of said energy radiations impinging upon said sensing means in accordance with the configurations of said patterns, means for causing a relative movement between said energy radiations and select ones of saidpatterns simultaneously whereby said energy radiations impinge upon said sensing means simultaneously in accordance with configurations of said select ones of said patterns, a cathode ray tube comprising means for producing cathode rays and a screen, cathode ray control means associated with said cathode ray tube, and electrical means for connecting said control means to said sensing means whereby voltages derived from said sensing means cause the character represented by the configurations of said patterns to be reproduced on said ca
  • a device wherein said means for causing a relative movement between said energy radiations and said patterns comprises cathode ray deflecting means associated with said electron discharge device for causing said cathode rays to sweep said screen.
  • a character tracer system having, in combination, an electron discharge device comprising means for producing an electron beam and a screen having the property of emitting a beam of radiant energy under the influence of said electron beam, a plurality of radiant energy sensing means for producing voltages positioned so as to be influenced by said radiant energy beam, a plurality of character synthesis patterns each of which is associated with one of said sensing means and each of which is positioned and arranged so that said energy radiations impinge on said patterns concurrently to thereby cause said energy radiations to impinge upon said sensing means in accordance with the configuration of the patterns associated therewith, electron beam sweep means associated with said electron discharge device for causing said electron beam to move past a region of said screen proportional to one of said pa erns whereby said beam of radiant energy sweeps said patterns simultaneously, and recording means responsive to voltage variations derived from said sensing means for effecting a tracing of a character represented by said patterns.
  • Adevice of the class described'having a pluralvoltage generator comprising an electron discharge device including means for producing cathode rays and a screen for emitting light energy radiations under the influence of said cathode rays, a plurality of masks having transparent and opaque configurations, optical elements so constructed and arranged as to cause said radiations to impinge upon said masks concurrently, cathode ray deflecting means for causing said cathode rays to sweep a region of said screen proportional to one of said masks whereby said radiations sweep said masks simultaneously, and generator output voltage means including a phototube for each of said masks, said phototube being posi tioned so as to be influenced by said radiations passing through an associated mask.
  • an electron discharge device including means for producing cathode rays and a screen for emitting light energy radiations under the influence of said cathode rays, a plurality of masks having areas of transparent and opaque configurations, optical elements so constructed and arranged as to cause said radiations to impinge upon related areas in each of said masks concurrently
  • cathode ray deflecting means including sweep means for causing said cathode rays to move past a region of said screen proportional to one of said areas and positioning means for causing said cathode rays to sweep in a selected order a plurality of regions of said screen corresponding to a plurality of mask areas
  • generator output voltage means including a phototube for each of said masks, said phototube being positioned so as to be influenced by said radiations passing through an associated mask, and timing means for applying a predetermined blanking voltage to said electron discharge device during every period said cathode
  • a character tracer system having, in combination, an electron discharge device comprising means for producing an electron beam and a screen having the property of emitting a radiant energy beam under the influence of said electron beam; a plurality of radiant energy sensing means for producing voltages, positioned so as to be influenced by said radiant energy beam; a plurality of character synthesis patterns each of which is associated with one of said sensing means, each of which, is positioned so that said radiant energy beam impinges said patterns concurrently, and each of which is arranged so that said radiant energy beam impinges said sensing means in accordance with the configuration of said patterns associated therewith; electron beam sweep means associated with said electron discharge device for causing said electron beam to move past a region of said screen proportional to one of said patterns whereby said radiant energy beam sweeps said patterns simultaneously, said electron beam sweep means including first means for causing said electron beam to vibrate in a single plane, and with an amplitude of vibration substantially equal to the height of one of said patterns and second means for moving said electron beam an amount equal to the distance across one of
  • a device of the class described having a pluralvoltage generator comprising an electron discharge device including means for producing cathode rays and a screen for emitting light energy radiations under the influence of said cathode rays, a plurality of masks having character synthesizing patterns defined by transparent and opaque configurations, optical elements so constructed and arranged as to cause said light energy radiations to impinge upon said masks concurrently, cathode ray deflecting means for causing said cathode rays to sweep a region of said screen proportional to one of said masks whereby said light energy radiations sweep said masks simultaneously, said deflecting means including first means for causing said cathode rays to vibrate in a single plane and with an amplitude of vibration substantially equal to the height of one of said patterns and second means for moving said cathode rays an amount equal to the distance across one of said patterns, and generator output voltage means including a phototube for each of said masks, each said phototube positioned so as to be influenced by said light

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Transforming Electric Information Into Light Information (AREA)
US423502A 1954-04-15 1954-04-15 Cathode ray character tracer Expired - Lifetime US2872669A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US423502A US2872669A (en) 1954-04-15 1954-04-15 Cathode ray character tracer
GB10442/55A GB786092A (en) 1954-04-15 1955-04-12 Cathode ray character tracer
FR1142376D FR1142376A (fr) 1954-04-15 1955-04-13 Dispositif électronique de formation de caractères
DEI10098A DE1099242B (de) 1954-04-15 1955-04-14 Anordnung zur Darstellung lesbarer Schriftzeichen auf dem Schirm einer Bildroehre

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Application Number Priority Date Filing Date Title
US423502A US2872669A (en) 1954-04-15 1954-04-15 Cathode ray character tracer

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US2872669A true US2872669A (en) 1959-02-03

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US423502A Expired - Lifetime US2872669A (en) 1954-04-15 1954-04-15 Cathode ray character tracer

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US (1) US2872669A (de)
DE (1) DE1099242B (de)
FR (1) FR1142376A (de)
GB (1) GB786092A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989614A (en) * 1957-11-20 1961-06-20 Zeiss Carl Method and device for working materials by means of a beam of charged particles
US3060419A (en) * 1958-12-16 1962-10-23 Skiatron Elect & Tele Number or symbol generator
US3091759A (en) * 1958-12-16 1963-05-28 Skiatron Elect & Tele Symbol generator
US3863098A (en) * 1970-09-04 1975-01-28 Measurement Systems Inc Two-axis positioning control

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2264615A (en) * 1939-11-01 1941-12-02 Ibm Keyboard controlled photographic recorder
US2320337A (en) * 1939-06-30 1943-06-01 Ibm Cathode tube recorder for calculating machines
US2534369A (en) * 1947-12-22 1950-12-19 Thomas I Ress Cathode-ray tube selector system
US2624798A (en) * 1948-03-23 1953-01-06 Mergenthaler Linotype Gmbh Photocomposing machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE469769A (de) * 1941-05-23 1900-01-01
US2674916A (en) * 1950-07-26 1954-04-13 Rca Corp Variable quantity evaluator having light sensing means

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320337A (en) * 1939-06-30 1943-06-01 Ibm Cathode tube recorder for calculating machines
US2264615A (en) * 1939-11-01 1941-12-02 Ibm Keyboard controlled photographic recorder
US2534369A (en) * 1947-12-22 1950-12-19 Thomas I Ress Cathode-ray tube selector system
US2624798A (en) * 1948-03-23 1953-01-06 Mergenthaler Linotype Gmbh Photocomposing machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989614A (en) * 1957-11-20 1961-06-20 Zeiss Carl Method and device for working materials by means of a beam of charged particles
US3060419A (en) * 1958-12-16 1962-10-23 Skiatron Elect & Tele Number or symbol generator
US3091759A (en) * 1958-12-16 1963-05-28 Skiatron Elect & Tele Symbol generator
US3863098A (en) * 1970-09-04 1975-01-28 Measurement Systems Inc Two-axis positioning control

Also Published As

Publication number Publication date
DE1099242B (de) 1961-02-09
FR1142376A (fr) 1957-09-17
GB786092A (en) 1957-11-13

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