Патент USA US2119795код для вставки
June 7, 1938. E, RUSKA AL 2,119,795 COMBINED ELECTRIC AND MAGNETIC DEFLECTING SYSTEM FOR OATHODE RAY TUBES Filed June 6, 1936 $369.1. \ I l 1 II I, Patented June 7, 1938 » I ~ COMBINED ELECTRIC AND MAGNETIC‘ D‘Ee FLECTING SYSTEM FOR CATHODE RAY TUBES ' . _ » Ernst Ruska and Erich Schwartz, Berlin-Zehlen dorf, Germany, assignors to the ?rm of. Fernsch Aktiengesellschaft, Zehlendorf, near ' Berlin, Germany Application June 6, 1936, Serial No. 83,978 In Germany June 19, 1935 4 Claims. (01. 250-275) The present invention relates to the construc- size that the‘ maximum outwardly de?ected ray tion of the cross de?ecting systems used in cath- One object of the invention is to provide a de?ecting system which is characterized by its 19 particular simplicity and compact structure and which at the same time may be produced by the glass blowing art. It has hitherto been customary to fasten the individual electrodes to fused-in tips or to arrange them in order on glass or 15 ceramic supports. Di?iculties arise however when can just leave the plate without touching. 'In plates (the anode potential in the ease of sym~~ ' metrically biased plates)7 The retaining yoke 4 of the de?ecting system 10 may be provided at the ray inlet side and 0on centric to the passage portion of the ray, with a conical or cap shaped ?tting surface 8 by means of which the system can be centered on corre sponding surfaces H) of the glass ‘base said ?tting 15 . a large number of electrodes is used since the surface 8 having a ?at base l8 ?xed to yoke 4. position of the individual electrodes cannot be maintained with su?icient accuracy during their constructional positioning and after preliminary The glass base consists of two concentric tubes l2 and I3 which are fused together on the side turned towards the screen. The conical portion . 20 heating. When the electrodes are positioned with insulating elements interposed between them the inexactness of adjustment increases as the separation from the ?rst electrode forming the reference surface increases, so that the last elec25 trodes embody unpermissible positional errors.‘ In accordance with the present invention two de?ecting plates are fastened to a common sup- is either ?tted into the inner tube l2 or onto the 20 outer tube l3 and its base plate l8 suspended by means not illustrated, at three points on itsv pe riphery, e, g, y means of wire loops and screws, to three hooks or lugs on the outermost base tube. Spreading springs M, e. g. four springs 25 made of nickel-beryllium alloy may be fastened to the base plate I 8 so as to effect contact of the ‘ port by means of the insulating coil members used conducting inner wall l5 which engages yoke 4' for both de?ecting windings, the said support and is concentric with tubes l2 and is with an . 30 serving to hold both halves of the de?ecting system in a rigid manner facing each other. internal metal or high-ohmic coating l9 serving 30 subsequently to accelerate the already cross—con—' The drawing illustrates by Way of embodiment trolled cathode ray. The lead-in conductors [6 a tube in which the common support member is leading to the de?ecting plates and coils as well positionally adjusted through agency of a ?tting as those carrying the anode voltage. are‘pre'ferably 35 surface of the glass wall of the tube. Fig- 1 shows a section through a portion of the base of the tube. located at the fusion junction of’ both base tubes. 35 A small ray-concentrating collector coil, not shown, may be disposed in the concentric annu 40 coordinate direction, are Wound on two insulating coil bodies 2 which are coaXially 01‘ nearly C0axially disposed close to both sides of the ray and end, upon the mutually facing sides of which the two electrically de?ecting plates 3 are fastened. The Wards the screen-side end of the coil, the coil " 40 being surrounded by anI iron jacket open at that _ _ What is claimed is; . ' 1, In a cathode ray tube,v de?ecting electrode l5 coils are connected on the other side by means of mounting means comprising a reentrantly folded 45 a connecting member or yoke 4. This yoke per annular envelope portion, a conical supporting se serves to eifect the entire adjustment of the and conducting element adapted to inwardly en- ‘ system. In the arrangement shown in Fig. 1 the gage said annular envelope portion, a bi-furcated ray passes through the center of the yoke and. yoke ?xed to said conical element, a spool ‘of o enters into the system. For this purpose the yoke 4 is provided at that point with an opening 5 which is centered with respect to the system. The plates 3 are suitably adapted to accommodate the ray, that is, they have an inlet interval equal 5 to the ray diameter and an outlet interval of such insulating material ?xed to each bi-furcated 50 portion of said yoke, a de?ecting coil wound about each of said spools, and a de?ecting plate ?xed upon each of said spools. ' 2. In a cathode ray tube having an envelope enclosing electrodes, electrode mounting means, 55 ‘ _ 2 2,119,795 comprising a doubly reentrant annular stem por tion formed in said envelope, a bi-furcated yoke having divergent legs, a conical apertured mem ber disposed centrally upon said yoke, an insu lating spool disposed adjacently upon each yoke leg, as de?ecting coil wound about each of said spools, and a de?ecting plate disposed upon each of said spools; said conical member being adapted to ?t within said annular stem portion, and hav ing means formed on said envelope wall adapted to cooperate therewith to ?xedly constrain said conical member. 3. In a cathode ray tube as described in claim 2, ?eld controlling means comprising plates ?xed to each of said spools in approximate continuance of and divergent from said de?ecting plates. 4. In a cathode ray tube having deflecting means supported therein after claim 2, having a conducting coating disposed inwardly upon the tube walls, means for connecting said supporting yoke to said conducting wall coating. 10 ERICH SCHWARTZ. ERNST RUSKA.