Патент USA US2121829код для вставки
Jgpé 28,1938. R_.H;'sE'AMAN ET AL - 2.121.829 ' ADVERTISING SIIGN Filed Oct. 5, 1955 2 ‘Sheets-Sheet l CarZA. Sciazezrdezz I I BY Ig _ UTA 21110 RNEY . Patented June 28, 1938 _ v 2,121,829 PATENT OFFICE '_ UNITED ‘STATES 2,121,829 ' ~ ADVERTISING SIGN . Richard H. Seaman, Los Angeles, and Carl A. Schwenden, Alhambra, Calif., assignors, by di rect and mesne assignments, of forty percent to said Seaman, forty percent to Walter T. Wells, Glendale, Calif., and twenty percent to. Lloyd Spencer, Los Angeles, Calif. Application October 5, 1935, Serial No.- 43,'l42 ' 15 Claims. _Our invention relates broadly to advertising (01. 176—124) from the right to the left, or'from the two out-1 signs and more particularly to an electrical cir cult arrangement and oscillating current source and means and methods for supplying oscillatory, currents to electrical discharge tubes for produc ing predetermined electrical effects for use. in advertising signs. ' ' One of the objects of our invention is to pro vide a system of mobile'electrical discharge in a 10 sign which may be used, for instance, for adver-, tising purposes in such a fashion that the mov Ing glow discharge will either write words or ‘ trace drawings or both in any desired fashion. Another object of our invention ‘is to provide ’ constructions of gas ?lled glow discharge tubes preformed in suitable shapes and connected to an electrical network which serves as exciter in such a way that the glow discharge can be varied in intensity as well' as made to move in any de 20 sired pattern. ’ ‘ Still another object of our invention is to pro- ' side terminals of the. wave-like discharge tube. towards the middle portion of the tube; Fig. 2 is a schematic diagram of a modi?cation of our invention showing a twisted cable‘ connecting the source to the exciting coil of the glow discharge device; Fig. 3 ‘is another modi?cation of our in vention showing a Lechervwire feed; Fig. 4 illus trates a further modi?cation of our invention em ploying a parallel wire feed; Fig. 5 is as'chematic 10 diagram of our invention including a novel form of oscillator in connection with a glow discharge device whereby the desired discharge effects are e?iciently produced; and Figs. 6 and '7 are sche matic diagrams and illustrate schemes for operat ing several glow discharge devices in accordance with our invention. ' , _ ' ’ Referring to the drawings in more detail, Fig. 1 shows a glow discharge device I which may be a wave-like tube of preformedv shape, an ad; 20 vertising sign or the, like, having terminals 2 and 3 ‘connected to an‘ exciting coil 4. , ,A connector 6 glow discharge device to produce a visible ioniza _' connects a suitable adjustable tap 5 'of the ex tion and providing means whereby the ionization citing, coil 4 to an adjustable tap ‘l in the output vide a source of oscillating voltage for causing a " 25 " can be made to occur progressively and give the ' circuit of an oscillator, shown in Fig. 1 as a‘push - appearance'of writing words or tracing pictures. A further object of our invention is to provide pull electron tube oscillator, which produces an oscillatory current. It willbe observed that the a method of connecting an [electrical discharge ‘ connection between theoscillator and the excit- _ ing coil 4 is unipolar, the circuit being completed device to a source of oscillating current in, order 30 to produce a desired movement or progression .of the glow discharge in the device. _ to the oscillator through the capacity of the tube - I with respect to ground. The electron tubes 8 and 9 may bev excited from an, alternating cur provide a circuit arrangement for electrical de- - rent line In of the customary commercial fre vices adapted to eii'ect movement or progressive quency. Reference character ll denotes a ?la A still further object of our invention is to change in the’ glow discharge in an electrical. ment heating transformer and I2, a plate supply discharge device. _ transformer. In some cases, the secondaries of , Another object of our invention 'is to'provide ‘a circuit arrangement for a plurality of glow discharge devices connected to a source of oscil 40 lating current for producing mobile ‘discharges in the discharge devices. '45 ‘ " the ?lament heating transformer and the plate ‘supply transformer can be associated with a com mon core and a common primary winding. In the arrangement shown in Fig. 1, where separate transformers are used, the plate [voltage can be 40 varied by means of av variometer [3, ‘which may Still another object of our invention is to pro vide ‘a circuit arrangement of such character that be a variable choke coil or a variable resistance. for certain frequencies of the current of the ’_This gives a means of changing the output power, source with respect to‘ the natural frequency of ‘ for constant ?lament excitation. The terminals an exciting coil connected across a glow tube of the oscillator coil 14 are connected to plates l5 and I6, and} grids l1 and I8 connect through system, a‘ dark space can be made to move through the'glow discharge. ' Other and further objects of our invention re side in the circuit arrangements and apparatus hereinafter; more fully described with reference .to the accompanying drawings, in which:. " condensers l9 and 20 to suitable adjustable taps 2| and 22 on the oscillator coil l4. Reference characters 23, 24, and 25 denote choke coils adapted to con?ne ‘the generated oscillatory cur rent 'to selected circuits. A grid leak resistorv is shown at'26. 'Tuning condenser 21 is employed a ?xed coil M to vary the output frequency. ‘of?ourinvention, whereby a glow discharge can ~with be made to move either from the left to the‘ right, The frequency can also be varied by means of 55 Figure 1 is a schematic diagram of one form 2 2,121,829 an adjustable coil l4 as is well known in the art. The operation of the system shown in Fig. 1 is as follows: With the connector 6 connected to an adjust able tap 5 of exciter coil 4, such that the voltage between tap 5 and terminal 3 of the discharge ing circuit. The plate 36 and the grid 31 con nect to an oscillating circuit consisting of the coil device is larger than the voltage between tap 5 and terminal 2, a glow discharge will start from denser 34 and the resistor 26' are used to supply terminal 3 and progress along the wave-shaped tube I towards terminal 2; This operation can be made to repeat itself over and over if an in tensity adjuster or an appropriate interrupter is employed. A variable ?lament resistancemay be manually or automatically varied in order to 15 keep the glow discharge in constant motion from either end of the discharge device. This can also be done by moving adjustable tap 1 along coil I4. If the adjustable tap 5 is set to a position so that the voltage between tap 5 and terminal 2 is 20 larger than that between tap 5 and terminal 3, the glow discharge will move from terminal 2 towards terminal 3. Also, in the system shown in Fig. 1, if the fre quency of the oscillator is changed from the value 25 for resonance with the natural frequency of the exciting coil 4 and discharge tube I, a dark spot is produced in the glow discharge occurring in the tube I. This dark spot can be made to move from left to right, or right to left, by selectively 30 changing the position of either tap 5 or tap ‘l. The dark spot can also be produced by connection of a ground g at a suitable point of the exciter coil 4 as shown'in Fig. 1A. It is also possible to produce a number of dark 35 spots which can be made to move. If a number of points along the exciting coil 4 are grounded, substantially duplicating the connection to ground g shown in Fig. 1A,v a dark spot will appear in the tube l in the relative position of each 40 though in most cases, it is more practical to oper ate the tube system from either a D. C. or an A. C. ' power supply system such as the standard light ground connection. ' i4 and the variable condenser 21. The con grid bias. The plate potential is applied through tap 39 on the oscillator coil l4. A step-over resonator consisting of a coil 3|, 10 another coil 32, and a variable condenser 33, serves the purpose of transferring an adjustable high frequency power from the tube oscillator to the glow discharge device. The magnitude of the power transferred can be adjusted by means of 15 the coupling between coils 32 and I4, or between coils 3| and 30, or by means of both. -It can also very conveniently be done by placing a variable resistor in the link circuit 30--28—29. For in stance, in many of our experimental set-ups we 20 use a motor driven variable resistance in this link circuit for causing the glow to trace over and over a particular pattern of an advertising sign. The wave shape of the current transferred along the link 28, can be controlled by means of the 25 variable condenser 33. If the inductive coupling } between the oscillator and the .link system 28 is , sumciently loose, a pure sinusoidal current will ?ow along the link branch, if condenser 33 is set for resonance. Variation of the condenser from 30 this position alters the Wave shape of the oscilla tions transferred and may be employed to produce dark sections in the glow discharge as hereinbe fore described. . > It will be noted that the link section 28 which is coupled to the step-over resonator through coil 30, consists of a twisted wire cable which will transfer maximum power from the step-over resonator 3|, 32, 33, to the exciter coil 4. The link system can also consist of a concentric tube By the system of our invention, we are, there fore, able to make a glow discharge progressively feed for which the outside cylinder can be ground form from one terminal to the other, or move a which is shielded by the outside cylinder forms the other conductor. The coupling to the exciter glow discharge, along tubes of any shape in any Hence, if tube I is, for instance, ed and acts as one conductor while the axial wire 45 desired way. coil 4 is effected by means of coupling coil 29 which can be moved along the exciter coil 4, in order to make the glow discharge move either out a certain desired figure from one end of the ’ from the left to theright or from the right to tube to‘the other end. the left, as desired. Certain positions along the Moreover, when tap 5 is near the center por 60 exciter coil 4 may be grounded as shown in Fig. tion of the exciting coil 4, two glow discharges 1A, which gives another means for modifying the move from the respective terminals 2 and 3 to glow‘ discharge occurring in the tube l in the wards the middle portion of the tube i. system of Fig. 2. We have also discovered that in the system of Fig. 3 illustrates a modification of the system of our invention, by a proper adjustment of the our invention shown in Fig. 2; For clearness,‘ the ' frequency of the source with respect to the nat tubes or other forms of generating devices, are neon ?lled and bent into a form adapted for ad vertising, we can make the sign write or trace ural frequency of the exciter coil, a dark region is ‘ produced somewhere in the glow of the tube l. The position of this dark region in the glow dis 60 charge is dependent upon the relative frequency between the frequency of the source and the nat ural frequency of the exciter coil, and is varied in the system of Fig. 1 by adjustment of the con denser 21 which a?ects the frequency of the 65 oscillator. We have, therefore, another means for producing motions in a glow discharge of a sign, which is useful in the art. Fig. 2 shows another embodiment of the system of our invention. For clearness, the glow dis 70 charge tube I has a preformed wave-like shape, and the terminals 2 and 3 of the discharge tube omitted and are considered as contained in the rectangle 45. Condenser 21 and coil l4 comprise the oscillating circuit, and the power is trans ferred inductively from coil l4 to coupling coil 44. 60 Tuning is effected by means of condenser 43 con nected in shunt to coupling coil 44 and controls the amount of power transferred to the discharge device. The link 42 represents a Lecher wire feed connecting to the coil 29 which is coupled at a selected position on the exciter coil 4, in order to ‘ produce a desired motion of the glow discharge pattern occurring in tube I. ' The operations are iubstagtially as set forth in connection with Figs. .and . Fig. 4 shows another modi?cation of our in vention. Source 45 and coil l4 represent an ' are connected to the exciter coil 4, as in Fig. 1. A single tube 35 is connected into an oscillator ‘ oscillation generator connected through linev 48 circuit, and for clearness, is shown powered by a 75 ?lament battery 40 and a plate battery 4|, a1 to the exciter coil 4 of the glow discharge de vice l. The coupling to the generator is made 3 . 2,121,829 through condensers 50 and 49 at suitable taps 5| and 52, and the connection to the exciter coil 4 is made through taps 41 and 46 at selected positions on the coil 4. The operations of the system are substantially as set forth in connec tion with the preceding ?gures, but in this case the adjustments are made by means of tap con nections. Provisions are made for tuning the exciter system connected to the glow discharge Ii) device I to the generated frequency, as well as for changing the magnitude of the power trans ' ferred to the exciter coil 4. Fig. 5 illustrates a preferred form of our in vention comprising a ‘novel oscillator circuit in 15 combination with coupling means to the dis charge device of the type shown in Fig. l, which, however, can be replaced by either of the ar rangements shown in Figs. 1-4. For clarity, the oscillator circuit is shown employing a single 20 three-element tube 63, having a ?lament cathode 64, a grid 65, and a plate 66. The grid is con nected through a grid leak 62, shunted by a grid condenser 6| to a coil 54 which connects to one terminal of the ?lament cathode 64. The 25 plate 66' is connected through a source of po tential 58, shunted by condenser 84, to a coil ' 55 which connects to the same terminal of the ?lament cathode 64. The other terminal of the ?lament cathode 64 connects through a coil 56 to 30 a variable resistor 60. A source of ?lament cur rent 59 connects with the ?lament through plate coil 55 on the one hand and through the re sistor 60 and ?lament coil 56 on the other hand. By-pass condenser 51 is connected in shunt with the source 59 and the resistor 60. The plate coil 55 and the ?lament coil 56 are wound bi?lary and made exactly alike. Coils 54, 55 and 56 are arranged in inductive relation. The variable re sistor 66 is adjusted either manually or automati-i 40 cally for varying the intensity of the oscillating power. The negative terminals of the plate and ?lament power supplies are preferably grounded‘. Theoscillator circuit thus de?ned differs great ly from customary oscillators, since as far as 45 dynamic potentials are concerned, the cathode is at a. comparatively high potential, and im proved response in the output circuit to a varia ble cathode' current results. Connection from the oscillator is made by means of a tap 68 on 60 the coil 55, or coil 54, as may be the case. Tun ing condenser 21, connected in shunt with coils 54 and 55, affords a means for varying the fre quency of the-oscillator. Tap 29 on the exciter coil 4 has the same function as explained in con nection with Fig. 1, and the single wire feed 53 connects taps 68 and 29. In our research and development, we have found the system shown ently excited from the exciter coil 4 by means of , suitable potentials produced at one end 4a, of . the exciter coil 4 with respect to taps 80, 19, 18, and the other end 4b of the coil. The ter minals of the tubes 69, 10, ‘ll, 12 are designated 13-14, 8l-15, 82—16, 83-", respectively. Tap 29 indicates the connection from an oscillator. Fig. '7 shows a simpli?ed arrangement of the network shown in Fig. 6. It will be noted that the exciter, coil 4 is directly connected across 10 tubes 69, 10, ‘II, and 12, so that-all'the tubes have the same potentials impressed on the ter minals thereof. , While we have described our invention in cer tain preferred embodiments, we desirev it to be 15 understood that various modi?cations may be made therein by those skilled in the art, and no limitations upon our invention are intended other than may be imposed by the scope of the ap pended claims. ' . 20’ ' What we claim as new and desire to secure by Letters Patent of the United States is as follows: 1. A glow discharge advertising sign connected across a ‘coil which is energized by a unipolar connection at a suitable position on the coil from an oscillating source in such a way as to suc cessively draw a predetermined pattern by means of a movable ionization glow, the circuit through said coil being completed through the capacity effect of the glow discharge sign with respect to 30 ground. 2. A gaseous discharge device connected across a coil which is energized by means of a parallel wire link terminating at two suitable taps on said coil at one end and terminating at the I other end at two suitable taps on a. coil carrying .an oscillating current for producing a mobile glow discharge pattern. 3. In an oscillating current generator,‘ an ex- . citer coil, a glow discharge device connected 40 across said coil, and a link circuit coupled to said generator and said coil for transferring oscillat ing power to said coil for producing a movable glow discharge pattern. 4. An oscillating current source in combination 43 with a plurality of cascade circuits, one of which constitutes a link for transferring oscillating power from said source to another of said cir cuits which applies the power to a discharge de vice producing a movable glow discharge pat- , tern. . 5. In a system for producing mobile glow dis charges, an oscillator comprising an electron tube having a cathode, a grid, and a plate, circuits in terconnecting said grid and said plate with one terminal of said cathode and inductively coupled,‘ ' means connected with the other terminal of said in Fig. -5 especially well adapted for producing mobile glow discharge patterns. We have shown the glow discharge tube 1 formed in a predeter cathode for maintaining said cathode at an ele vated potential, variable means associated with said cathode for modifying the intensity of the IV) mined pattern such as the sign “Flowlite”. Any desired shape may be given to the sign. charge device, an exciter coil connected to the terminals of said discharge device, a connection Acombined system of feedingthe exciter coil may be employed using the connection 6 of Fig. 1, and arranging the exciter coil 4 in ?xed inductive relation with coil I4 in the oscillator circuit, after the teaching in Figs. 2-4 of an inductively coupled link circuit.. In such a sys tem, the inductive coupling provides for the transfer of ‘energy to the exciter coil 4, and the position of connection 6 at tap 5 on the coil 4 determines the position of the standing waves in the coil 4 and the tube I. Fig. 6 illustrates one method whereby several 75 glow discharge tubes 59, 10, 1|, ‘I2 are differ output current of said oscillator; 'a glow, dis- - from said oscillator circuit to a selected point on said exciter coil, the adjustment of said variable means controlling the speed of progression of the glow discharge in said device and the position of said selected point on the exciter coil determin— ing the direction of the movement of the ?ow dis charge. ' v 6. In a glow discharge system, means for pro ducing a mobile glow discharge which comprise an oscillator arranged to produce a high fre quency current varying in intensity in succes sive cycles, a discharge device, an exciter coil con 70 4 2,121,829 nected with said discharge device, and a con necting link circuit from said oscillator to said exciter coil adapted to determine the character of the movement of the mobile glow discharge produced by said varying high frequency cur rent. 7. In a glow discharge system, means for pro ducing a mobile glow discharge which comprise an oscillator arranged to produce a high fre quency current varying in intensity in succes sive cycles, a discharge device, an exciter coil con_ nected with said discharge device, and a connect ing link comprising a path through ground and a unipolar connection from said oscillator to a 15 selected position on said exciter coil, the position of said connection determining the' character of the movement of .the mobile glow discharge pro duced by said varying high frequency current. 8. In a glow discharge system, means forpro 20 ducing a mobile glow discharge which comprise an oscillator arranged to produce a high fre quency current varying in intensity in successive cycles, a discharge device, an exciter coil con nected with said discharge device, and a connect 25 ing link comprising a pair of connectors coupled with said oscillator and connected to selected po sitions on said exciter coil, the positions of said connections determining the character of the movement of ‘the mobile glow discharge produced 30 by said varying high frequency current. 9. In a glow discharge system, means for pro‘ ducing a mobile glow discharge which comprise a high frequency oscillator, a discharge device, an exciter coil connected with said discharge de vice, and a connecting link comprising a tunable circuit coupled with said oscillator, and a feed line terminating in a coupling coil arranged in in ductive relation at a selected position on said exciter coil, the characteristics of said tunable 44) circuit determining the character of the move ment of the mobile glow discharge and the se lected position of said coupling‘ coil on said ex~ citer coil determining the direction of movement of the glow discharge. 10. In a glow discharge system, means for pro ducing a mobile glow discharge as set forth in claim 9, and wherein said feed line comprises a twisted wire cable adapted to transfer maximum power from said oscillator to said discharge de vice. ll. In a glow discharge system including a plu rality of glow discharge tubes, and a single source of high frequency current, means for producing a different glow discharge in each of said tubes, which comprise an exciter coil connected with’ said source of current, and connections from said plurality of glow discharge tubes across different,v portions of said exciter coil, 12. In a glow discharge system, means for pro ducing a mobile glow discharge as set forth in claim 9, and wherein said feed line comprises a Lecher wire feed. . 13. In a glow discharge system, means for producing a progressive glow discharge in a predetermined direction which comprise a high frequency oscillator, a discharge device, an ex citer coil connected with said discharge device, means for feeding energy from said oscillator'in a selected portion of said exciter coil, and means for varying the intensity of the energy from said oscillator, the glow discharge progressing with increase in said current in a direction determined by the position of said selected portion of the exciter coil. . 14. In a glow discharge system, means for pro ducing a glow discharge characterized by a mo bile dark section, which comprise a high fre 30 quency oscillator, ‘a discharge device, an exciter coil connected with said discharge device, a con nection between said oscillator and said exciter coil, and a connection from ground to a selected point on said exciter coil intermediate the ter minals of said coil. 15. In a glow discharge system, means -for pro ducing a glow discharge characterized by a mo bile dark section, which include an oscillating current source, a coil,’ a glow discharge device 40 connected with said coil, and a link circuit inter connecting said coil and'said source. RICHARD H. SEAMAN. CARL A. SCHWENDEN.