US1997371A - Picture transmitting device - Google Patents

Picture transmitting device Download PDF

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US1997371A
US1997371A US463762A US46376230A US1997371A US 1997371 A US1997371 A US 1997371A US 463762 A US463762 A US 463762A US 46376230 A US46376230 A US 46376230A US 1997371 A US1997371 A US 1997371A
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light
transparent
rays
elastic
picture
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Loiseau Louis Marie Jean
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0128—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects
    • G02F1/0131—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence
    • 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

Definitions

  • the present invention relates to devices for the electric distant transmission of pictures; it con cerns more particularly the means for exploring a picture and recomposing the same respectively at t the transmitter and the receiver television stations.
  • these laminae are excited in succession with alternating currents, being thereby caused to vibrate successively at their natural frequency.
  • the laminae become double retracting, and by means of appropriate supplementary parts, such as polarizers or analyzers, only the beam of light which has passed through two laminae vibrating, simultaneously reaches the photoelectric cell.
  • a continuous transparent and homogeneous body is employed, and by applying to one of its faces, at regular time intervals, an elastic disturbance of short duration, for instance a compression or an impact. narrow zones of mechanical deformation are set up which travel at regular time intervals through the transparent body thereby modifying the optical properties of the
  • an elastic disturbance of short duration for instance a compression or an impact.
  • narrow zones of mechanical deformation are set up which travel at regular time intervals through the transparent body thereby modifying the optical properties of the
  • the speed with which the zone of deformation will travel depends only on the transparent body utilized, and more particularly on its coefficient of elasticity and on its density, whereas the width 3 of this zone depends only on the duration of the disturbance applied to one of the faces of the body.
  • Fig. l is a diagram illustrating the principle of operation of the device, as described above.
  • Fig. 2 is a diagrammatic view of a transmitter or receiver.
  • Fig. 8 represents a device preventing the renexion of the elastic waves.
  • Figs. 4 to 9 represent electrical devices enabllng the creation of an elastic perturbation on one of the faces of the transparent body.
  • Figs. 10 and 11 represent diagrammatically a transmitter and a receiver in a simplified form of realization.
  • Figs. 12 and 13 represent another simplification of the transmitter.
  • Figs. 14 and 15 represent respectively in transverse section and in elevation. a transmitting device comprising one transparent medium only.
  • Fig. 18 represents a receiving device realized in the same manner as the above transmitter.
  • Figs. 17 to 19 represent devices providing synchronization between the transmitter and the receiver stations.
  • Fig. 2 shows a device applicable to the transmitter station: by means of an appropriate optical device.
  • a picture of the object it is desired to transmit is formed on the screen ii in such a way that the picture emits rays parallel to the line X X.
  • these luminous rays passing through a polarizer if for instance a nicol. and then through a parallelepiped l3 transparent to the light waves. and in which the elastic waves i8 travel in the direction of the arrows. then an analyzer it. and afterwards a second parallelopiped i5 similar to the first. and lastly a second analyzer it.
  • the rays are concentrated on the photoelectric cell H.
  • the polarizers and analyzers are placed in such a manner that the analyzer it normally extinguishes the rays of light which have been polarized by I 2 and have traversed the body 13.
  • an elastic disturbance is produced. for instance a compression or a shock of very short duration. on the upper face of the body if. an elastic wave is will be set up. which would travel downwards at a speed of 5.500 metres per second if the body is quartz. this speed depending only upon the nature of the body. and the thickness of the deformed zone depending upon the duration of the elastic perturbation thus set up.
  • the optical properties of the body will be modified. The body will acquire. for instance. the property of transforming light polarized linearly by I!
  • the analyzer i8 is disposed so that it normally extinguishes the light or the light rays that have traversed the zone It and the analyzer ll; if then one produces in the body I! a disturbance that is propagated horizontally in the direction indicated by the arrow. by submitting one of the lateral faces of the body to an elastic perturbation. it is seen that the phenomena will again be set up: the zone of perturbation is will now play the part of a vertical slot travelling horizontally. and finally only the beam of light having passed through the zones l8 and I! will not have been extinguished at its exit from the analyzer i8 and will sensitize the photoelectric cell i'l.
  • a similar system is used at the receiver for scanning the whole of the surface of the detector (screen or sensitive plate) by means of a beam of light whose intensity is modulated. for instance by means of a Kerr cell or a neon or similar tube acting as source of light. the modulatlon being carried out by the current from the photoelectric cell II.
  • the exit face of the transparent body being preferably given such a direction. that the angle which it forms with the direction of propagation of the elastic wave is the angle of total reflection.
  • the face of separation 28 between the transparent media 26 travelled through by the elastic wave in the direction of the arrow. and an adjacent medium 21. forms with the said direction or propagation an angle such that the elastic wave is entirely refracted and passes into the medium 21.
  • the medium 21 is limited by a body 29 absorbing and reflecting the elastic wave in a direction such that this wave does not meet the transparent body 26; the wave is preferably directed towards other absorbing and reflecting surfaces such as ll. 82. in order to be damped by successive reflections and absorptions.
  • the electrical circuit into which the condenser is discharged is oscillating.
  • the discharge is also oscillating and the zone of mechanical deformation travelling through the transparent body will be constituted. not by one zone of compression alone. but by a succession of narrow a1- temative zones of compression and decompression, constituting a real train of waves limited by two planes.
  • This will be a detriment to the successful operation of the device because, by a convenient choice of the constants of the electrical circuits used, things may be arranged so that the total duration of each oscillating discharge is sumciently short in order that the deformation due to the train of waves will not be too large.
  • the dielectric may advantageously be constituted by a lamina of a piezo-electric crystal.
  • the transparent body only undergoes deformations during the passage of the elastic wave passing through it.
  • the condenser 33 is charged by the battery 84 through induction coils or resistances such as 18 suitably ad- Justed: It is discharged through a neon lamp 38.
  • induction coils or resistances such as 18 suitably ad- Justed: It is discharged through a neon lamp 38.
  • an auxiliary condenser 31 inserted in the grid circuit of a threeelectrode tube 38 is charged by means of a battery 34 through suitable induction coils or resistances 35 and is unloaded through the neon lamp 38.
  • the condenser is acting upon the transparent body is controlled by the anode circuit, for instance through the transformer ll; or through a resistance or an induction coil shunted by the condenser 38. This arrangement allows the amplification of the current provided by the lamp 38 to be made use of.
  • the relaxation circuit comprising the auxiliary condenser 83.
  • the resistances or induction coils 3B, the charging battery 34 and the neon lamp 38 is coupled through the transformer 42 to the grid circuit of the three-electrode tube ll whose anode circuit acts, for instance through the transformer ll, on the condenser I8 which sets up the disturbances that travel through the transparent body.
  • Figure 9 represents an arrangement particularly adapted for producing a train of waves similar to that due to an oscil ating discharge: the two tubes 44 and 45 mounted as oscillators, give rise to oscillating variations of potential in the condenser 3
  • the arrangement represented as a whole in Figure 2 and described at the beginning of the description may be considerably simplified.
  • One may, first, take for the transparent body ii, a body acting at rest (i. e. in the absence of deiormations) as polarizer; in this case, the polariser It becomes useless, provided that the transparent body II and the analyzer ll be disposed in such a manner with respect to one another that the analyzer is extinguishes all the light rays passing through the body I 3 in the absence of an elastic wave.
  • the body I! a body which is such that it may serve as analyzer, one may do away with the analyzer it provided the parts I! and it are placed conveniently with respect to one another.
  • Figures 10 and 11 respectively represent a simplified transmitter and a simplified receiver as explained.
  • the emitter comprises an optical system 0, designed to protect the image in parallel light rays, two transparent bodies I02 and I inside which elastic waves travel in two directions normal to one another, these bodies being separated by the analyzer ills, a lens I! concentrating the light leaving the device, on to the photoelectric cell I05, and a device III! in which the carrier wave is modulated by the current of the cell I05.
  • the receiver comprises a source of light I09. an optical system I") concentrating the beam of light on to a Kerr cell I modulating the intensity of this beam under the action of the current which it receives from the receiver of wireless waves In.
  • a lens l2! transforms the light whose intensity is modulated and which comes from the device I20, into a beam of parallel rays I12.
  • the two transparent bodies I24, I" inside which travel the elastic waves I26, I21 are separated by the analyzer Ill; the displacement of the elastic waves is controlled by devices I30, Ill which will be described later. connected to the receiver I23 and ensuring the synchronism of the travelling of the elastic waves at the emitter and at the receiver.
  • the beam of light thus modulated by the emitter current, comes out of the transparent body It! and sweeps a screen on which the picture is reproduced.
  • the transmitter system may further be simplified by uniting the sensitive cell and the medium it! into one sole element. In this way it is possible to suppress the optical system its ( Figure 10) and increase the optical emciency of the system.
  • Figure 12 shows the corresponding transmitter comprising an airtight space Ill empty or illled with a gas at a suitable pressure.
  • One of the wals is constituted by the surface ll! of the second transparent body I in which the clastic wave it! travels; an electrode lie of the cell is constituted for instance by potassium supported on a plate I". the other electrode being in the form of a ring ilxed to the face N2 of the transparent medium I.
  • a photoelectric cell one may also use a photoresistant cell, for instance a selenium cell.
  • Figure 13 shows such a device. In this device its is a selenium plate applied against the face I42 of the transparent medium I and connected to the transmitter I39. I85 is the elastic wave travelling inside the medium I34.
  • Figures 14 to 16 illustrate a form in which the media I02 and I04 and the analyzer I03 of Figure are united and in which the cell is fixed to the medium in which the elastic waves travel, as in the case of Figure 12 or 13.
  • This new device comprises neither the use of polarized light nor that of an analyzer.
  • the device according to these figures comprises a piezoelectric body I43 whose electrical axis is set and inside which the elastic waves travel in two directions making with each other a certain angle, for instance a right angle, and crossing one another over a small surface I40, I41, I40, I49 ( Figure 14), these waves being set up by means of two condensers 80, 8
  • a photoelectric material is placed on the external surface I50 of the piezoelectric medium I 43 which may, if desired, be covered by a metal layer constituting an electrode sufilciently thin to be transparent to light.
  • the electrode which replaces it may be constituted, as shown on the figure, by a ring I53, I54 of convenient form surrounding the surface I50.
  • the other electrode I55, parallel to I50, is covered with a matter which is sensitive to light, for instance potassium, sodium or the like.
  • These electrodes are connected to suitable parts such as a battery and a potentiometer I56 and I51.
  • the adjustment of the device is carried out in such a way that:
  • the field between the electrodes is higher than the lower working limit only in the region I5I, I52, I53, I54 where the two elastic waves cross each other: in front of this region common to the two waves, the field is, indeed, stronger due to the piezoelectric charge developed in this place on the face I50 of the transparent body under the effect of the resultant mechanical deformation produced by the two elastic waves.
  • the cell therefore produces a current that corresponds only to the quantity of light passing through the surface I5I, I52, I53, I54. This small surface element sweeps the whole of the surface of the picture to be transmitted, due to the displacement of the waves I44 and I45, thus producing the emission of the picture.
  • the apparatus used is similar to the one just described in relation with the transmitter. It is represented on Figure 18.
  • one piezoelectric medium I55 is traversed by two elastic waves at right angles I44 and I45, as represented in the transverse section of Figure 14; the current, transmitted by wire or by wireless waves, is amplified by I50 which is connected to two electrodes I00 and IGI comprising between them a medium such as a rare gas under reduced pressure capable of being illuminated under the action of an electric field when the latter rises over a certain value.
  • the electrode I50 is on the surface of the piezoelectric medium I 6
  • the medium I58 being piezoelectric, the field in front of the region I46, I41, I48, I49. intersection of the two elastic waves I44, I45 is higher than in the other regions comprised between I50 and IN, due to the charge developed on the surface I60 under the effect of the mechanical deformation produced in this region by the two elastic waves.
  • the two electrodes I50 and IBI are connected to a regulating device, such as a battery and a potentiometer I 52 and I03 which enables the system to be adjusted in the following manner:
  • the field El produced by means of the potentiometer in the absence of a wave has a value such, that when the field E: is produced by the two elastic waves in a tube of force whose section is I45, I41, I48, I48, Ei+Ea is insufilcient to produce the luminescence of the gas inside this tube.
  • the surface of intersection of the two waves does not necessarily present a uniform charge if the zone of transformation is constituted, as indicated above, by a train of waves, but the above result is still obtained, because, in certain points, the field exceeds the limit of ionization in the transmitting apparatus.
  • Figures 14 to 16 may be utilized at the receiver or at the transmitter. Even when the device at the other station is not similar to the one described, but is according to the embodiment represented by Figure 2.
  • an auxiliary electric or luminous radiation may be used whose effect will add to that of the light or to that of the electric field.
  • One of the difllculties in the realization of television apparatus is the maintenance of synchronism between the transmitter and the receiver stations.
  • synchronism between the two stations may be maintained with sufilcient precision during the interval necessary for the beam of light to explore once the totality of the picture, and that it is suificient, after each exploration, to perform a correction in order to re-establish the synchronism, in the same way as this is done in numerous telegraphy apparatus, in order that the errors at the end of each exploration shall not be allowed to accumulate and finally produce serious deformations of the transmitted picture.
  • Figs. 17 and 18 show, also schematically and by way 01 example, the devices permitting after each sweeping, for instance at each l/18th of a second to stop for a very short time, for instance 1/l00th of a second, the devices producing the disturbances, both at the transmitter and at the receiver, these devices beginning their operation again simultaneously, the eiIects of the slight discrepancies in the movement of the exploring and the reproducing beam, produced during the previous exploration being thus rendered ineilective on the next exploration.
  • and 62 comprise condensers 63 and 64 each one 01' which'acts upon one of the transparent bodies, such as those represented in I3 and I6 on Figure l, neon lamps and induction coils or resistances, these relaxation circuits being inserted in the anode circuits of the tubes 66 and 56; the grids of these tubes are connected to a third relaxation circuit 61, also containing a condenser and a neon lamp, adjusted in such a manner that its condenser is discharged after each sweeping of the picture, for instance after every l/l8th of a second, the duration of the discharge being very short, for instance l/lOOth oi a second.
  • the potential of the grids of the tubes 65 and 66 attains a value such that the neon lamps oi the circuits 6i and 52 remain lit and that, consequently, the operation of these circuits is interrupted.
  • the neon lamp oi the circuit 51 is out, things will be again in their original state and the condensers oi the circuits 6
  • the arrangement provides, as it is seen, a sort or return to zero device; in order that this return to zero shall be produced at the same moment at the receiver, the circuit 61 acts p n the grid of a third tube 66 coupled in any suitable manner, for Instance by means of transiormers 66 with the radio or other transmitter ensuring the communication between the two stations in the case of wireless transmission, or with the line connecting the television emitting station with the radio (or other) transmitter.
  • the receiver is provided with a device similar to the preceding, for instance that represented in Figure 18; it comprises two circuits 6
  • This circuit is adjusted so as to be acted upon and to act in turn on the grids only when it receives through the line It the current corresponding to the current emitted at the receiver by the tube ll.
  • the synchronization may also be obtained by 5 using a device in which the gas lamps, for instance neon lamps, constituting part of the relaxation systems producing the elastic waves, and the synchronizing system of the said lamps act by their light emission directly on the transmitting photoelectric cell.
  • the gas lamps for instance neon lamps
  • the synchronizing system of the said lamps act by their light emission directly on the transmitting photoelectric cell.
  • One may also send, without any additional intermediate part, currents to the receiver, which are directly utilized for producing elastic waves synchronously with those oi the transmitter, or ior synchronizing only the special synchronizing cell.
  • Figure 19 shows a device of this type.
  • I64 is th medium in which is propagated the wave I 66 emitted for instance under the action of a condenser formed by a semi-conductor I66 in contact with a conductor I61. This arrangement forms a condenser of very small thickness excited by a relaxation device I66.
  • the device oi automatic emission of the wave comprises a slot I 69, a source of light I16 emitting a beam of rays which are rendered parallel by the optical system "I, and placed in such a way that the rays are parallel to the plane of the elastic wave I65; these rays are polarized by means of the polarizer I12 and analyzed by the an analyzer I13, placed alter the slot I14 and set at right angles with the polarizer I12 in order to extinguish normally the rays issuing through I14.
  • a photoelectric cell I16 connected to an amplifying deas vice I16 and to the relaxation system I 68 arranged in such a way that an impulse of current before the cell I16 brings about the emission of an oscillation in I68 and consequently the emission 01. an elastic wave in the medium in which it travels.
  • the operation of the device will be easily understood.
  • the current producing the emission of each elastic wave may just as well be emitted by the 00 cell serving tor the transmission of the current corresponding to the illumination 0! the various points of the picture, since, at the moment when the current producing the emission oi an elastic wave is sent out, no Illumination signal is being 05 transmitted and consequently there cannot be anyt'inter Schlluminace between these two sorts of curren What I claim is:
  • a light controlling device ior decomposing and recompoeing the picture comprising a body in the form or a rectangular transparent, continuous, homogeneous parallelopiped, having in all its points the same physical 76 properties in its normal state, and optical properties changing in the same manner in every volume element submitted to a same mechanical stress, means for causing the rays of light to fall perpendicularly on one face of said body, and means for applying to one of the lateral faces, parallel to the rays of light, an elastic disturbance in such a manner that it gives rise to a wave motion of plane elastic waves travelling through said body and creating mechanical stresses in the interior of the movable zone occupied by the said wave.
  • a light controlling device for decomposing and recomposing the picture comprising a body in the form of a rectangular transparent, continuous, homogeneous parallelopiped, having in all its points the same physical properties in its normal state, and optical properties changing in the same manner in every volume element submitted to a same mechanical stress, means for causing the rays of light to fall perpendicularly on one face of said body, and means for subjecting one of its lateral faces, parallel to the rays of light, to a series of alternate displacements during very short time intervals separated by equal time intervals, so as to produce in the body narrow zones of mechanical deformation constituted by elastic waves with two fronts (the fore front and the aft front) limiting the deformed movable zone, travelling one after the other through the body, remaining parallel to the said face and producing on their passage mechanical stresses.
  • a light controlling device for decomposing and recomposing the picture comprising one after the other on the path of the rays of light two bodies in the form of rectangular parallelopipeds, these bodies being transparent, continuous, homogeneous, having in all their points in their normal state the same physical properties, and optical properties changing in the same manner in every volume element submitted tc a same mechanical stress, means for causing re, a of light to fall perpendicularly on one face of each body.
  • said faces being parallel to one another, means for subjecting, during very short intervals of time separated by equal time intervals, one of the lateral faces parallel to the rays of light, these two faces being perpendicular to one another, to a series of small alternate displacements in order to create, in each of the two bodies, a wave motion of plane elastic waves with two fronts (fore and aft front) limiting the deformed zone, travelling one after the other through each one of the bodies in two directions respectively normal to one another and producing on their passage mechanical stresses, means for extinguishing the rays of light passing through the said transparent bodies outside of the movable zones of deformation.
  • a light controlling device for decomposing and recomposing the picture comprising in succession on the path of the rays of light, a polarizer, two bodies in the form of rectangular transparent, continuous, homogeneous parallelopipeds, having normally the same physical properties in all their points and capable, under the effect of an interior stress, of polarizing elliptically plane polarized light, means for causing rays of light to fall perpendicularly to one face of each body, these two faces being parallel to one another, means for applying to one of the lateral faces of each one of the bodies parallel to the rays of light, said faces being perpendicular to one another, a series of elastic disturbances during a very short time at equal intervals of time, 5 in order to form, in each one of the transparent bodies, two narrow zones of mechanical deformation constituting plane elastic waves limited by two planes parallel to the disturbed faces of each body and travelling in two directions respeco tively perpendicular with respect to one another,
  • a light controlling device for decomposing and recomposing the picture comprising one after the other on the path of the rays of light two bodies in the fo 25 tangular, transparent, continuous and homo geneous parallelopipeds, having normally in all their points the same physical properties, and optical properties changing in the same manner in every volume element submitted to a same no mechanical internal stress, means for causing rays of light to fall perpendicularly on one r th faces of each one of the bodies, these faces being parallel to one another, two plane condensers constituted by a dielectric and two armatures, 35 means for charging progressively these condensers and for realizin at equal time intervals, an oscillating discharge, means for fixing each one of these condensers to a lateral face, parallel to the rays of light, of each one of the transparent 40 bodies, these faces not being parallel to one another, in such a manner that the successive compressions and expansions of the dielectric due to the oscillating discharge are
  • a transmitting station comprising a light controlling device for decomposing the picture, consisting in a piezoelectric body in the form of a rectangular continuous, transparent, homogeneous parallelepiped having in all its points the same physical properties, and optical properties changing in each volume element submitted to a same mechanical stress, means for so causinfl the light to fall normally to one face oi the body, a photoelectric cell constituted by an air-tight space adjacent to the exit face of the rays of light traversing said body, on this face a layer of metal sumciently thin to be transparent o5 constituting the anode.
  • a receiving station comprising a device for receiving and amplifying the modulated current from the transmitter, a device for recomposing the picture, comprising a piezoelectric body in the form of a rectangular continuous, homogeneous parallelepiped, two condensers constituted each by two metal armatures and a dielectric, means for charging progressively these condensers and for obtaining, at regular 5 time intervals, an oscillating discharge, means for fixing one of the armatures of one of the condensers on one lateral face of the piezoelectric body, means for fixing one of the armatures of the other condenser on a second lateral face of the piezoelectric body perpendicular to the first,
  • a metal layer sumciently thin to be transparent means for connecting the receiving device to these metal layer means for applying a biasing potential to one of the layers and means for adjusting the amplitude of the oscillating discharge of the condensers in such a manner that the potential resulting on one hand from the electric charge developed-on the face of the piezoelectric body ⁇ mder the effect of the passage of G0 the elastic wave and on the other hand from the biasing potential is such that the illumination of the gas takes place only in front of the portion common to the two elastic waves when a potential coming from the transmitter is applied between the two metal layers acting as electrodes, this potential serving for modulating the illumination of the gas.
  • a light controlling device for decomposing and recomposing the picture comprising a transparent, continuous. homogeneous body, having normally in all its points the same physical properties, and whose optical properties change in the same manner in every volume element submitted to a same mechanical stress, means for causing the light to fall perpendicularly to one of the faces of the said body. means for applying to one lateral face of this body, parallel to the ray 0!
  • a light controllin device for decomposing and recomposing the picture comprising, on the path of the rays of light, a body in the form of a rectangular transparent, continuous, homogeneous parallelopiped, having normally in all its points the same physical properties, and optical properties changing in the same manner in every volume element submitted to a same mechanical stress, a condenser constituted by two armatures and a dielectric, a neon lamp connected in parallel with this condenser, adjustable means for progressively charging said condenser until the difference of potential between its armatures is suflicient to produce the illumination of the neon lamp, means for producing an oscillating discharge at the moment this potential has been attained, means for fixing one armature of the condenser on one face of said transparent body in such a manner that the successive compressions and expansions of the dielectric during each oscillating discharge, are transmitted to the face of the transparent body to which is fixed the condenser, in order to produce

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
US463762A 1929-07-01 1930-06-25 Picture transmitting device Expired - Lifetime US1997371A (en)

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FR693285T 1929-07-01
FR38363T 1929-11-29

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DE (1) DE714398C (fr)
FR (2) FR693285A (fr)
GB (2) GB358087A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622470A (en) * 1948-01-07 1952-12-23 Mueller Hans Method of and system for indicating the light modulation in a transparent medium
US2649027A (en) * 1947-02-18 1953-08-18 Bell Telephone Labor Inc Electrooptical system
US2707749A (en) * 1949-06-21 1955-05-03 Rines Robert Harvey System of light beam communication
US2753763A (en) * 1952-12-31 1956-07-10 Du Mont Allen B Lab Inc Electron optical filter
US2807799A (en) * 1951-03-23 1957-09-24 Fairchild Camera Instr Co Light-modulator recording means
US2983786A (en) * 1958-08-29 1961-05-09 Hughes Aircraft Co Optical scanning device
US3077813A (en) * 1959-10-20 1963-02-19 Budd Co Stress-gauging devices
US3083262A (en) * 1960-11-25 1963-03-26 Electro Radiation Inc Solid state camera apparatus and system
US4063281A (en) * 1972-12-29 1977-12-13 Research Corporation Motion detection employing direct Fourier transforms of images
WO1984004641A1 (fr) * 1983-05-16 1984-11-22 Leighton Hanna King Panneau optique

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649027A (en) * 1947-02-18 1953-08-18 Bell Telephone Labor Inc Electrooptical system
US2622470A (en) * 1948-01-07 1952-12-23 Mueller Hans Method of and system for indicating the light modulation in a transparent medium
US2707749A (en) * 1949-06-21 1955-05-03 Rines Robert Harvey System of light beam communication
US2807799A (en) * 1951-03-23 1957-09-24 Fairchild Camera Instr Co Light-modulator recording means
US2753763A (en) * 1952-12-31 1956-07-10 Du Mont Allen B Lab Inc Electron optical filter
US2983786A (en) * 1958-08-29 1961-05-09 Hughes Aircraft Co Optical scanning device
US3077813A (en) * 1959-10-20 1963-02-19 Budd Co Stress-gauging devices
US3083262A (en) * 1960-11-25 1963-03-26 Electro Radiation Inc Solid state camera apparatus and system
US4063281A (en) * 1972-12-29 1977-12-13 Research Corporation Motion detection employing direct Fourier transforms of images
WO1984004641A1 (fr) * 1983-05-16 1984-11-22 Leighton Hanna King Panneau optique

Also Published As

Publication number Publication date
GB358087A (en) 1931-10-01
FR693285A (fr) 1930-11-18
DE714398C (de) 1941-12-04
FR38363E (fr) 1931-05-30
GB360699A (en) 1931-11-12

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