US2482275A - Electrical discharge device - Google Patents

Electrical discharge device Download PDF

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Publication number
US2482275A
US2482275A US630812A US63081245A US2482275A US 2482275 A US2482275 A US 2482275A US 630812 A US630812 A US 630812A US 63081245 A US63081245 A US 63081245A US 2482275 A US2482275 A US 2482275A
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United States
Prior art keywords
window
anode
envelope
filament
cathode
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US630812A
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English (en)
Inventor
Caperton B Horsley
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Machlett Laboratories Inc
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Machlett Laboratories Inc
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Priority to NL77655D priority Critical patent/NL77655C/xx
Application filed by Machlett Laboratories Inc filed Critical Machlett Laboratories Inc
Priority to US630812A priority patent/US2482275A/en
Priority to FR937491D priority patent/FR937491A/fr
Priority to GB35065/46A priority patent/GB630571A/en
Priority to DEP29019D priority patent/DE913677C/de
Application granted granted Critical
Publication of US2482275A publication Critical patent/US2482275A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details

Definitions

  • This invention relates toelectron discharge devices and is concerned more particularly with a device ofthat type which comprises an anode and cathode of novel construction and arrangement, together with a new means for deflecting electrons issuing from the cathode and focusing them upon the face of the anode.
  • the cathode includes an incan'descible filament, which is of large size and capable of producing a large quantity of electrons, and the cathode encircles the anode and may be so mounted that the cathode and the supporting means therefor are wholly outside any hemisphere subtended by the plane of the face of the anode.
  • the invention may be embodied to especial advantage in tubes for the generation of X-rays, which are superior to prior X-ray tubes in that the total X-radiation produced is available for use, so that the new tubes are peculiarly adapted for applications in which a large area of a specimen is to be irradiated, as, for example, for therapeutic purposes, for the production of photochemical changes, etc.
  • X-ray tubes constructed in accordance with the invention make use of all the features thereof, examples of such tubes will be illustrated and describedin detail for purposes of explanation.
  • X-r-ay tubes have commonly been so constructed that only a small part of the total radiation generated can be used.
  • the radiation issues from the target in all directions within the 180 solid angle or hemisphere subtended by the plane. of the target face and at anode voltages of the. order of 50- kv. or less, the intensity of the radiation is substantially uniform throughout that hemisphere.
  • a large part of the radiation is eclipsed by the cathodev and its supporting structure, which lie within the hemisphere ofradiation, and, in addition, it has been the common practice tov provide windows of relatively small area for the egress of the rays, so that the available radia-. tion is still further reduced.
  • An X-ray tube embodying the present. invention is adapted; to. produce X-rays of high intensity, because of the vlargefathode employed, and the entire amount of radiation produced may be put to use, because the cathode and its sup.- porting means are so.-constructed and arranged relative to the anode that they lie Wholly outside the hemisphere of radiation leaving the target surface and, thus,ydo. not. have the eclipsing effeet, as in. prior X-ray tubes.
  • the window of the new tube is. of such size, shape, and location, with relation to the anode and cathode, that it deflects. theele'ctron's leaving the cathode and focuses them upon the anode face and it also permits the egress of all the X-rays generated.
  • Fig. 1 is a View in longitudinal section of one form of X-ray tube embodying the. invention
  • Fig. 2- is a sectional view on line 2.:2 of Fig. 1;
  • Fig. 3 is. a sectional view'on an enlarged scale on the line 33 of Fig. 2;
  • Fig. 4 is a longitudinal sectional view through an X-ray tube of modified construction, which is provided with means for thev irradiation of materials;
  • Fig. 5 is a sectional view on the line 55 of Fig. 4';
  • Figs. 6, 7, 8, and 9. are sectional views through the anode end of the new X-rray tube, showing different constructions producing different. paths of travel of the, electrons. from the filament to the target;
  • Figs. 6a, 7a, 8a, and 9a are views showing the focal spots produced by travelof' the electrons along the paths illustrated in Figs. '6', 7, 8, and 9, respectively;
  • Fig. 10 isa longitudinal sectional'view through an X-raytube of modified.- construction
  • Fig. 11 is an end view of:.the tube shown in Fig. 19;and '1' Fig. 12 is a fragmentary longitudinal sectional view of another form of the new X-ray tube.
  • the X-ray tube illustrated in Fig. 1 comprises evacuated envelope comprising a re-entrant section of glass, united by a metal sleeve 2,! to. a cylindrical metal section 22.
  • the section 22 is formed at its open end with an internal circumferential; channel inwhich is seated the rim or base ofa window 23, which is of dished or dome; formation.
  • the window is preferably made of beryllium or the beryllium alloy.
  • a tubular shield 24 is mounted at the inner end of the section 22 to project beyond and protect the metal-glass seal between the glass section 20 and the metal sleeve 2
  • V I I A cathode'in the form of a metal ring 25 is mounted within the outer end of section 22- in a circumferential seat provided for the purpose. This ring is formed with a circumferential channel 26 facing outwardly and a filament 2'
  • the filament is, accordingly, substantially circular in shape and it lies in a plane.
  • the other end of the filament is connected toa stem 3
  • the section 22 is grounded in any appropriate fashion and the cathode is likewise at ground potential.
  • a hollow metallicanode shank 32 is mounted within the envelope by attachment to a sleeve 33 sealed in the end of the re-entrant portion of glass section 20.
  • the shank carries a target disc 34 on its inner end and the disc faces the interior of the window and is substantially concentric therewith.
  • the outer or target surface of the disc is substantially plane and lies substantially parallel to the plane, in which the filament lies, and the target surface lies closer to the window than the plane of the filament.
  • a metal tube 35 extends into the re-entrant end of the envelope section 20 and is seated in an internal channel in the end of the anode shank 32.
  • a metal tube 31 of smaller diameter than tube 35 extends through the fitting 36 and tube'35 concentrically withthe latter and into the anode shank to terminate close to the end wall thereof behind the target disc.
  • a line 38 connected to a source'of coolingfluid, delivers cooling fluid to tube 31 to be conducted thereby through the anode'shank and discharged against the wall at the back of the target. The fluid then returns through the space between tubes 35 and 31 to be discharged through line 39.
  • the anode may be connected to a source of high potential through a conductor 40 leading to fitting 36, and lines 38 and 39 contain sections of insulating tubing of substantial length to insulate the anode.
  • the anode In the operation of the tube, the anode is main tained at a high'pos'itive potential while the oathode and the windoware at ground potential.
  • the focal spot produced is of the shapeillustratedat 42 in Fig. 6a.
  • the electron paths 7 one point'on; the filament may pass across the face of the target to strike the target surface beyond its center.
  • the focal spot isofthe shape indicated at 43in Fig. 7a. Both the focal spots- 42, 43 have a recess becaus of the gap in the source of electrons represented by the I space between the ends of the filament.
  • the electrons may be caused to impinge at thecenter of the targetto produce a substantially circularfocal spot 44, as shown in Fig. 8a, and a similar 'spot 45 (Fig.v 9a) may be produced byslightly increasing the spacing between the window and thetarget surface, as
  • the cathodeand the support therefor may lie wholly outside any hemisphere subtended by the-plane of the target surface and the window isof such size and form that its base is outside that hemisphere. Accordingly, noneof the radiation is intercepted and all of it may issue through the window.
  • the new X-ray tube is illustrated inFig. 4 in a form suitable for thetreatment of'materials to produce changes therein, as, for example, the destruction of bacteria for the sterilization of food products, the production of photochemical changes, etc.
  • the tube is provided with a circumferentialfiange 45 adjacent.
  • thewindow and a casing 41 is mounted on the flange to enclose the window.
  • the casing has a circumferential'flange 48, which may be secured to flange 46, by screws 49, a gasket 50' being interposed between the flanges to make a liquidtight joint, before they are secured together.
  • Casing 41 has a hollow stem 41a extending coaxially' with the domed window and a-tube 5
  • a concave'plate 52 is mountedonthe inner end of 'tube 5! to lie. close to the window and the edge of the plate terminates close to the surface of flange 46, so that the plate, window,.and flange define a thin chamber of'substantial area.
  • a spiral partition 53' may be mountedon the inner surface of plate 52 toextend close to the surface of the window and this partition may be provided with baffles 54 lying between its convolutions. The partition, together with plate 52 and the'window, defines a spiral'passage having an entrance end .toiwhich' tube 5
  • the material to be irradiated' may be a gas or liquid or in the form of fine particles-suspended in a gas or liquid.
  • the fluid is supplied through a line 55 connected to theouter end of the stem fla, and enters tube 5
  • the material flows over the surface of the window through a prolonged path to escape beneath the edge of plate 52.
  • the material 'then flows back between the outer surface of the plate and the inner wall of themeing into the space within the stem 41a around the outer .surfacelof tube 51:; .Ihe material-escapesthrough .:.a line leading from the interior of stemifla. r
  • the degreeaof uniformity with which the material is irradiated dependss -:,on :the "thickness of the film.of;material;flowing over the surface of the .window .in that vzthe layers in th filmnea-r the WiHdOWJfibSQI'bTSDIIlG. of the radiation and thus shield the imaterial .in.,:1.&yers,-remote from the window.
  • the X-ray ztubeiliustrated in Fig. is ,1Providedxwith means by which the relative positions of the window .and target surface may be varied to vary the focusing :action of the window and, thus,1produce,focal spots of different forms.
  • l he tube includes :az-re-entrant glass section connected by .a :metal sleeve 2l sealed in the end thereof, :to :a cylindrical metal section .22 which is grounded in any suitable way.
  • An annular cathode isseated within the outer end of secti-on 22 .a-ndahelicalyfilament 2'5 is mounted in a circumferential channelin the face of the cathode.
  • :Qne end of thefilament is'connected to a stem 3.0, which extends through an insulating bushing in an mlenin fin the cathode and is connected to ;,a conductor .51 leading through an opening in .section 22'.
  • 211 c conductor is connected outside .the envelope to a sourceof filament current.
  • a domed window 23' which is preferably of heryllium orrof the Claussen alloy,-- closes the-end of section 2.2.
  • the window is provided with a lateral :fiange -60 secured against one face of a ring 61, which closely encircles the section .22 and is movable thereon.
  • Another ring 6.2 encircles section 22' and is secured to :a circumferential flange Projecting from the outer surface of the section.
  • the rings are connected by angularly spaced screws 64 which extendlthroughopenings in ring '61 and are threaded into ring :82, A spring .65 encircles each screw and bearsagainst the opposed faces of the rings at its ends.
  • a metallic bellows r61 encircles section 22 of theenvelope and its ends are secured, respectively, to opposed faces of ring '6! and flange 63.
  • a metal tube 68 is mounted around the outer surface of the windowad-jacent flangebi) and a cooling fluid maybe passed through the tube to help dissipate the filament energy.
  • the tube of ,10 contains an anode 32' having a flat target :disc 34 at its outer end, the anode being mounted on a sleeve 33 sealed in the r e-entrant end portion of the envelope section 2.0.
  • :Cooling .fiuid is introduced :into the anode through ;a metalifitting;3,6'-.anda tube 31" leading therefrom i-in'to the anode to terminate close "to the end 'wall thereof.
  • the fluid returns through the space within the anode outside tube Y31 and through arspace between-that tube and :a metal tube 35 which encloses tube 31 and extendsjfrom the :outer end of the anode to :fitting 155?.
  • the discharged fluidleaves the fitting through a line 391.
  • the window andthe target surface of thetube shown in Fig. :10 may be varied by turning the screws :66 and thus moving .ring BI .and the window toward or away from the stationary ring '62, while .the bellows 6'5 contracts or expands.
  • the glass section -20 is provided with a hollow neck 59-, which may .be connected to a pump operable during the use of the tube to maintain the vacuum therein.
  • Fig. 12 the construction illustrated in Fig. 12 may be employed.
  • the tube includes a beryllium window'z'sao'fdome shape, the rim of which enters .and is brazed to a ring if! of Monel metal. Ring 'll! is soldered to the'outer surface of a cup 1'!
  • the rim :of cup ill is sealedin one .end of a glassring :lZZ andtherim of a.second"Kovar' cup 1:3 is sealed .in the other end of the glass ring.
  • the cup 73 lies against and is soldered. to the face of a shoulder "14 formed .in the tube section 22a.
  • the glass ring insulates the window from the cathode and tube section 22a and the window is connected through a rheostat J 5 to the negative sideof a battery 16, the positive side of which is grounded.
  • the Window maybe maintained at a variable negative potential relative to the cathode so as to have a variable focusing effect upon the electrons leaving the cathode and traveling to the surface of the target.
  • the envelope is formed partly of metal and partly of glass, and the window is described as being made of beryllium or of the Claussen alloy, these metals being chosen because of their low X-ray absorptive power.
  • the tube with a glass envelope, of which a domed portion of a thickness of the order of -1 m. m. forms the window.
  • Such a window will collect a-charge, which will assist infocusing the electrons, although provision shouid be made in the usual way to prevent the accumulation upon the window of so great a charge that puncture may result.
  • the window maybe made of any suitable metal, .such as copper, aluminum, or stainless steel, the latter bein desirable because of its resistance to corrosion.
  • the focusing means will lie within the hemisphere subtended .by the plane 7 of the target surface and may be mounted wholly within the envelope or may form part of the en,- velope, as desired. In such devices, the X-ray absOrption characteristics of the metal used for the focusing means is unimportant and, therefore, beryllium or the Claussen alloy need not be employed.
  • the oathode and its supporting means he wholly to the rear of a plane through the target surface, so that they are entirely outside the hemisphere of radiation.
  • the extreme end of the cathode projects into the hemisphere of radiation to a small extent, but substantially all of the radiation is available.
  • the cathode is unusually largeso that a large quantity of electrons is produced and X-ray tubes embodying the invention are, accordingly, adapted for the production of high intensity X-radiation.
  • the area of the window is such as to permit substantially all the radiation "to pass therethrough.
  • An X-ray tube which comprises an evacuated envelope, an anode including a substantially plane target surface within the envelope, and a cathode including a filament within the envelope and in such relation to the anode that electrons from the filament travel to the faceof the target, the cathode lying substantially entirely outside any hemisphere subtended by the plane of the target surface and the envelope including a window relatively more permeable to X-rays than the remainder of the envelope and of such shape and location relative to the target surface that substantially all the radiation emanating from the target face passes through the window.
  • An X-ray tube which comprises an evacuated envelope, anode and cathode means within the envelope, the cathode means including a filament, the filament lying coaxially of the anode and in such relation thereto that electrons travel along curved paths from the filament to the.
  • An X-ray tube which comprises an evacuated envelope, an anode including a substantially plane target surface within the envelope, a cathode including a filament within the envelope, the filament having substantially the form of a circle about the center of the target surface and of larger diameter than the target surface and the cathode being in such relation to the anode that all the electrons from the filament that travel to the anode move along curved paths, a window forming part of the envelope and of larger diameter than the filament for egress of the rays.
  • An X-ray tube which comprises an evacuated envelope, an anode including a substantially plane target surface within the envelope, and a cathode including a filament within the envelope, thefilament being of substantially closed form with its ends close to one another and substantially concentric with the target surface, the filament defining an area of greater transverse dimensions than the target surface and the oathode being in such relation to the target surface cathode including a filament within the envelope,
  • the filament lying spaced laterally from theprojecting area of the target 'surface'andsubstantially entirely outside any hemisphere subtended by the'plane of the target surface.
  • An X-ray tube which comprises an evacuated envelope, an anode including a substantially.
  • a cathode including a filament within the envelope, the cathode lying substantially entirely outside a y hemisphere subtended by the plane of the target surface, and a window for egress .of X-rays formingpart of the wall of the envelope, the window lying within said hemisphere.
  • An X-ray tube which comprises an evacuated envelope, an anode including a substantially plane target surface withinthe envelope, a cathode including a filament withinthe envelope, the cathode lying substantially entirely outside any hemisphere subtended by the plane of the target surface, and a window for egress of X-rays form'- ing part of the wall of the envelope, the window being of dished shape and having the major portion of its area within said hemisphere.
  • An X-ray tube which comprises an evacuated envelope having a window for egress of the rays, an anode within the'envelope having a substantially plane target surface facing the win- 9.
  • An X-ray tube which comprisesan evacuated envelope having a metallic window for egress of the rays, the window being of dished shape,
  • an anode within the envelope having a substantially plane target surface, the rim of the Window lying adjacent the'plane of the target surface, and. a cathode including a filament within the envelope, the filament lying substantially entirely outside any hemisphere subtended by the plane of the target surface and being electrically connected to the window. 7 a
  • An X-ray tube which comprises an evacuated envelope having a metallic window for egress of the rays, an anode having a target surface within the envelope, and a cathode having a filament within the envelope, the filament being substantially concentric with the target surface and defining an area greater than that of the target surface, the window being connected electrically to the filament and being adapted to act as a focusing means for the'electron beam leaving the filament.
  • An X-ray tube which comprises an evacu V 9 ated envelopehavi'nga-metallic-window for egress of the rays, an anode; having a target surface within the envelope; a cathode having a filament within the envelope, the window being connected electrically to the filament and adapted to focus the electrons passing from. the filament to the target surface, and means for varyin the relative positions ofv the target, surface and the window to vary the focusing action of'the latter and produce a selected focal spot.
  • AnX-raytube which: comprises an evacuated envelope havinga metallic window for egress of the rays, an anode having a target surface within the envelope, a. cathode having a filament within the envelope, the window being connected electrically to the filament and adapted tofocus the electrons passing. from thefilament to the target surface,,and means,fo r varying the position of the window relative to the target surface to vary the focusing action of the window and produce as'electedfocalspot.
  • An X-ray tube- which comprises an evacuated envelope having a metallic window of outwardly dished form" at one end, an anode within the envelope having a target surface facing the concave surface of the window, a cathode within the envelope having a filament lying substantially concentric with the anode and spaced laterally from the target, the window and filament being electrically connected, whereby the window is adapted to focus electrons to cause them to travel along a curved path from the filament to the target surface, and means for altering the relative positions of the window and target surface to vary the focusing action of the window.
  • An X-ray tube which comprises an evacuated envelope, an anode within the envelope having a target surface, a cathode within the envelope having a filament spaced laterally from the target surface, and focusing means adjacent the filament for directing electrons from the filament in the same general direction as the axis of the anode and away from the target surface, the envelope having a wall acting as an additional focusing means for the electrons between the filament and the target surface.
  • An X-ray tube which comprises an evacuated envelope, an anode Within the envelope having a substantially plane target surface, a cathode within the envelope having a filament, and a focusing element having a channel surrounding the target surface and offset laterally therefrom, the channel facing in the same direction as the target surface and the filament being mounted within the channel, the envelope having a wall lying close to the curved path of the electrons between the filament and target surface and assisting in directing the electrons along that path.
  • An electron discharge tube which comprises an anode having a substantially fiat face, a cathode including a filament surroundin the anode and lying in a plane parallel to the face of the anode and substantially entirely outside any hemisphere subtended by the plane of the anode face, means forming part of the cathode for directing electrons from the filament into such a hemisphere, and means within said hemisphere for deflecting the electrons and focusing them onto the anode face.
  • An electrondischarge' tube which comprises an evacuated-envelope; an anode withinthe envelopehaving a substantially; flat" face; means within the envelope lyingsubstantially entirely outside any hemisphere subtended'by the plane of said faceforemittingahollow beam of electrons traveling-intothe hemisphere; means within such a hemisphere” adaptedt'o-be maintained at a potential-suchthat said means deflect the electrons and cause therrrto strike'theanodeface, and means for-'varying-thepoten-tialon saiddefiecting means.
  • Anelectroh discharge tube which comprises an evacuated envelope, an; anode within the envelope having a" substantially fiat face, means within the envelope lying substantially entirely outside any hemisphere subtended" by the-plane of said face for -emitting-ahollow beam of electrons travelinginto -the-her'nisphere, and means forming part of the wall of the envelope for deflecting the electrons: and-causing. them to strike the anode face.
  • An X-ray tube which comprises an evacuated envelope, an anode within the envelope having a substantially flat face, a cathode insid the envelope encircling the anode, the cathode lying substantially entirely outside any hemisphere subtended by the plane of the anode face and being operable to project a hollow beam of electrons into that hemisphere, a metallic window forming part of the envelope for egress of the X-rays, the window being insulated from the cathode, and means for maintaining the window at a potential such that it is effective to deflect the electrons entering such a hemisphere and cause them to strike the anode face.
  • An electron discharge tube which comprises an anode having a substantially plane face, a cathode including a filament surrounding the anode and lying substantially in a plane parallel to the plane of the anode face and substantially entirely outside any hemisphere subtended by the plane of the anode face, and an envelope enclosing the anode and cathode, the envelope having a portion of domed shape adjacent the anode and cathode acting to focus electrons emitted by the filament upon the anode face.
  • a cathode comprising an annular element having a channel in one of its faces which extends transverse to the axis of the element, the channel extending coaxially with the element and the inner wall of the channel terminating in a plane lying outward beyond a plane through the end of the outer wall of the channel, and a filament of generally circu- 60 lar form mounted within the channel.
  • An X-ray tube which comprises an evacuated envelope, an anode having a target surface within the envelope, and a cathode including a filament within the envelope, the filament en- 65 circling the axis of the anode extending through the target surface and lying in such relation to the anode that electrons from the filament travel to the target surface, the cathode lying substantially entirely outside the path of any radiation 70 issuing from the target surface in the operation of the tube and the filament lying wholly outside the projected area of the target surface.
  • An X-ray tube which comprises an evacuated envelope, an anode having a target surface 75 within the envelope, a cathode including a filamentwithin the envelope, the filament encircling the axis of the anode through the target surface and the cathode lying substantially entirely outside the path of any radiation issuing from the target surface in the operation of the tube, and means for-deflecting electrons emitted by the filament to cause them to strike the target surface, said means including a member 1ying in the path of'said radiation and means for maintaining the member at a negative potential.
  • an anode In an electron discharge tube, the combination of an anode, a cathode structure including a filament of generally circular form, and a pair of focusing means for causing electrons emitted by the filament to converge along curved trajectories toward a central axis normal to the plane of the filament and to form a beam of substantially circular cross-sectional outline directed toward the anode, said beam having a diameter substantially less than that of the filament, one of said focusing means comprising a member having an annular focusing channel coaxial with V the anode, in which the filament is mounted, and
  • the other of said focusing means including a concave member lying coaxial with said first member and with its concave surface adjacent the path 12 of electrons leaving the filament and efiective to deflect them towards the anode.

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  • X-Ray Techniques (AREA)
US630812A 1945-11-26 1945-11-26 Electrical discharge device Expired - Lifetime US2482275A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL77655D NL77655C (fr) 1945-11-26
US630812A US2482275A (en) 1945-11-26 1945-11-26 Electrical discharge device
FR937491D FR937491A (fr) 1945-11-26 1946-11-25 Dispositifs à décharge électronique
GB35065/46A GB630571A (en) 1945-11-26 1946-11-26 Improvements in electrical discharge devices
DEP29019D DE913677C (de) 1945-11-26 1949-01-01 Roentgenroehre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US630812A US2482275A (en) 1945-11-26 1945-11-26 Electrical discharge device

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Publication Number Publication Date
US2482275A true US2482275A (en) 1949-09-20

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US630812A Expired - Lifetime US2482275A (en) 1945-11-26 1945-11-26 Electrical discharge device

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US (1) US2482275A (fr)
DE (1) DE913677C (fr)
FR (1) FR937491A (fr)
GB (1) GB630571A (fr)
NL (1) NL77655C (fr)

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US2679017A (en) * 1950-12-26 1954-05-18 Machlett Lab Inc X-ray tube
US2761992A (en) * 1950-08-19 1956-09-04 Siemens Reiniger Werke Ag Electrical discharge tube
US2791708A (en) * 1953-02-06 1957-05-07 James T Serduke X-ray tube
US3296476A (en) * 1961-10-31 1967-01-03 Licentia Gmbh X-ray tube
US3649861A (en) * 1970-09-09 1972-03-14 Picker Corp Double focus x-ray tube
JPS4947570U (fr) * 1972-08-02 1974-04-25
US4493097A (en) * 1982-08-30 1985-01-08 The Perkin-Elmer Corporation Electron gun assembly
US4969173A (en) * 1986-12-23 1990-11-06 U.S. Philips Corporation X-ray tube comprising an annular focus
US5345493A (en) * 1992-01-27 1994-09-06 U.S. Philips Corporation X-ray tube with a reduced working distance
US10973111B2 (en) * 2017-03-08 2021-04-06 Heuft Systemtechnik Gmbh Cooling device for x-ray generators

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DE1091243B (de) * 1955-03-19 1960-10-20 Licentia Gmbh Roentgenroehre mit punktfoermigem Brennfleck

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DE390346C (de) * 1922-10-28 1924-02-18 Siemens & Halske Akt Ges Roentgentherapieroehre fuer grosse Leistungen
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US1949463A (en) * 1930-10-13 1934-03-06 Thomas H Forde X-ray tube
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US1954231A (en) * 1930-01-13 1934-04-10 Rca Corp Glowlamp
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US1226383A (en) * 1916-07-18 1917-05-15 William Robinson X-ray tube.
DE390346C (de) * 1922-10-28 1924-02-18 Siemens & Halske Akt Ges Roentgentherapieroehre fuer grosse Leistungen
US1626465A (en) * 1922-12-06 1927-04-26 Philips Nv X-ray tube
US1949347A (en) * 1924-06-04 1934-02-27 Philips Nv Electric discharge tube
US1954231A (en) * 1930-01-13 1934-04-10 Rca Corp Glowlamp
US1954046A (en) * 1930-05-23 1934-04-10 Mueller C H F Ag X-ray tube
US1949463A (en) * 1930-10-13 1934-03-06 Thomas H Forde X-ray tube
US2362816A (en) * 1943-04-15 1944-11-14 Gen Electric Electrical discharge device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761992A (en) * 1950-08-19 1956-09-04 Siemens Reiniger Werke Ag Electrical discharge tube
US2679017A (en) * 1950-12-26 1954-05-18 Machlett Lab Inc X-ray tube
US2791708A (en) * 1953-02-06 1957-05-07 James T Serduke X-ray tube
US3296476A (en) * 1961-10-31 1967-01-03 Licentia Gmbh X-ray tube
US3649861A (en) * 1970-09-09 1972-03-14 Picker Corp Double focus x-ray tube
JPS4947570U (fr) * 1972-08-02 1974-04-25
JPS5334144Y2 (fr) * 1972-08-02 1978-08-22
US4493097A (en) * 1982-08-30 1985-01-08 The Perkin-Elmer Corporation Electron gun assembly
US4969173A (en) * 1986-12-23 1990-11-06 U.S. Philips Corporation X-ray tube comprising an annular focus
US5345493A (en) * 1992-01-27 1994-09-06 U.S. Philips Corporation X-ray tube with a reduced working distance
US10973111B2 (en) * 2017-03-08 2021-04-06 Heuft Systemtechnik Gmbh Cooling device for x-ray generators

Also Published As

Publication number Publication date
NL77655C (fr)
GB630571A (en) 1949-10-17
DE913677C (de) 1954-06-18
FR937491A (fr) 1948-08-18

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