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A 24-Ee-C. 4, 4-Ce 1727 Apaavars 1 Sept Sept. 25, 1956 A. R. KNIGHT 2,764,698 CONTROL, SYSTEM Filed Nov. 23, 1942 3. Sheets-Sheet . a F/s, 2. 1aaaaasacas May-seat AfaaczeoMcS2a2My MM G. s. a / es. 42. al af 2 C a/ e 7 y 2 C2 7Mya O 72M-7a 1FM e.a. af y a 1% 17a7a-7 U/ae / M7// Ga-2 a 24-ee-c. 4, 4-ce 1727 apaavars 1 Sept. 25, 1956 A. R. KNIGHT 2,764,698 .CONTROL SYSTEM 1727 a 74/a McMawata/7 as 12-tea/Vass/ 2,764,698 United States Patent Office Patented Sept. 25, 1956 2 Figure 2 is a similar view of a reference image on an other iconoscope for purposes that will appear later. 2,764,698 Figure 3 illustrates the relationship of light intensity with respect to time for the iconoscope mosaic of Fig CONTROL SYSTEM ure 1. Arthur R. Knight, Dayton, Ohio Figure 4 illustrates the relationship of the light-intensity with respect to time for the iconoscope mosaic of Fig Application November 23, 1942, Serial No. 466,972 ure 2. - Figure 5 illustrates the differential light intensity with 8 Claims. (C. 250-214) () respect to time of the two iconoscope mosaics represented (Granted under Title 35, U.S. Code (1952), sec. 266) in Figures 1 and 2. Figure 6 illustrates the circuit diagram of one form of my invention. Figure 7 illustrates the time relationship. of the square The invention described herein may be manufactured wave voltage of the circuit, the sweep voltages of the and used by or for the Government for governmental iconoscope, and the differential output voltages of the purposes, without the payment to me of any royalty two iconoscopes. ...thereon. Figure 8 illustrates a bomb having the invention there This invention relates to systems...of indication and/or .O. control and more particularly to indication or control of 20 Figure 9...is a block. diagram of my invention when used direction whereby, an object may be guided to a pre with an indicator. determined location. Figure 10 is a block diagrams of my invention, when -One object of this invention is to provide improved used to operate the direction control means of...an air means of indication and/or control. Another object is to craft. provide means for guiding an object into a source of Referring now to Figure 1 it is apparent that-the target electromagnetic radiation. Another object is to provide is square and located directly at the center of the mosaic. means of direction control in which the device controlled This is done, for purposes of illustration, only. As the is guided in several directions. beam sweeps from points a to bit is assumed that a dark The invention may be utilized in: conjunction with background is swept. From points : b to c the target various types of moving bodies incorporating direction 30 emanates radiations which causes an increase in voltage control means. The principal application of the inven at the iconoscope. From c told there is a dark back tion is for:guiding a bomb which has been released from ground. The voltage variation. (not-the-actual voltage) an aircraft into a source of radiations such as a battle is illustrated in Figure. 3. Figure 4, illustrates the varia ship, Searchlight, powerplant or the like. Another ap tion in light with respect:to time on the second iconoscope plication is for guiding: a water-borne torpedo boat into of Figure. 2. This iconoscope is...exposed only to a ref an enemy warship. Still another: application resides in erence image-centered on the mosaic. - the guidance and landings of aircraft. The differential.light intensity of the two iconoscopes The principle underlying my invention will be described is illustrated in. Figure 5 which shows two main surges of very precisely as it is applied to the mode of use which energy, which are transformed into corresponding surges at present appears to be the most important and best. 40 of voltage. These two surges of voltage are compared The radiations of the target toward which the device is to with each other and when one is stronger-than the other be guided are intercepted by:anticonoscope of well known the vanes of the bombare-operated to change the course form. The image impressed on the iconoscope is 'swept of the bomb. by the beam and the image resulting on one half, of the Apparatus for, carrying out the invention as just de mosaic is compared in; intensity with that on the other 45 'scribed is illustrated in Figure. 6. In this figure: the half. Assuming as would be the case on a dark night iconoscope 20 has two horizontal plates 21 and 22° and ror on a day in which confusing reflections were absent wertical, plates 123 and, 24. By horizontal and vertical that the radiating target to be destroyed by the bomb plates, I. do not mean they have such relationship with emits large. quantities of infra-red light, it will set up 50 respect. to the earth, because to so view them would be a voltage in the iconoscope circuit. If the image of the misleading. call them horizontal and vertical simply object to be destroyed appears on-one side of the center because custom permits understanding of the operation of theimosaic the voltage will be increased while that side when the plates are thus described. A sweep generator ..is being 'swept. A comparison of the veltage intensities 25; energizes the horizontal and vertical plates of icono on the respective halves of the mosaic indicates which scope 20. A second iconoscope 20 has plates 26, 27, 28 side of the true line of direction the bomb is traveling. and-29 that are respectively electrically in parallel with This invention provides automatic means, hereinafter de plates 21, 22, 23 and 24. A pulse generator 30 is pro scribed, for making this comparison and controlling the vided to supply pulses to the sweep generator 25 and syn bomb to cause it to travel on the true line. chronously -to square wave generator 3. It is noted When the bomb is dropped from aircraft it must be 60 that as shown in Figure 7 the sweep circuit and the square controlled in two directions whereas when the bomb is wave voltage are so related that the square wave voltage in the form of a water-borne boat only control in one changes polarity precisely at the instant the iconoscope plane of direction is necessary. For effectuating control beam sweeps past the center line of the mosaic. of direction in two planes, the horizontal and vertical The signal plate circuits of iconoscopes 20 and 20 sweep circuits of the iconoscope are reversed intermit 65 are connected in opposition at points 60 and iO1. he tently, and the output of the comparison means is likewise differential output of the iconoscopes is then amplified synchronously alternated between the vanes that."respec and fed into the control circuit. Before discussing the tively control the bomb in different directions. : controls circuits, a disclosure of the functions of icono in the 'drawings: scopes 20, and 208 will be made. Iconoscope 20 corre 70 sponds to the iconoscope of Figure 1. That is, the image Figure. 1 is a view of the mosaic of the iconoscope with of the target and its surroundings is impressed on this theiimage, in this case the target, shown thereon. iconoscope. On iconoscope 20 only the reference image - 2,764,698 4 3 44 and 45 are operative and when the beam is sweeping of Figure 2 is impressed. Iconoscope 20a, is inclosed the image north and south the coils 40 and 4 are op and is subject to illumination only through a slitted mem erative. The principle underlying the above node of ber 60 from a light source. The light failing on mosaic application, just described, is one of the inventive fea 61 of this iconoscope therefore has the shape shown in tures of this patent. Stated briefly, there are two sets FigureThe control2. circuit for comparing the- surges x-y and of controls for two vanes that respectively control the z-w of Figure 5 will now be described by reference North-South direction and the East-West direction. The particularly to Figure 6. The control circuit includes a response of iconoscope 20 is shifted from a North-South dual triode tube 102 having a common cathode 90, two sweep to an East-West sweep intermittently, and simul grids 34 and 35 respectively controlling current to two O taneously with the shift from the coils controlling the anodes 38 and 39, and two sets of two relay coils 40, North-South direction to the coils controlling the East 41 and 44, 45. When the switch 58 is in its up closed West direction. position, the coils. 44 and 45 are inoperative and this The frequency at which switching mechanism, 59 op condition will be assumed for the time being solely for erates the reversing switches 57 and 58 may be either purposes of description. The square wave generator 3: greater or less than the frequency at which the complete alternately blocks grids 34 and 35, thus forming a gating target is scanned but preferably the period of operation : circuit means. During the first half of the time required of switching member 59 should be several times longer to sweep each line of mosaic 61, the grid 34 is blocked, than the period required for the beam to sweep one line but current can freely flow from cathode 90 to plate 39 of the mosaic.
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