DE1564310A1 - Electron gun - Google Patents

Description

M 199 * 1

Minnesota Mining and Manufacturing Company, Saint Paul, Minnesota 55 101 ♦ V.St.A.

Electron gun

The invention relates to improvements in electron guns

With the invention, an electron gun is to be created that has a new type of massive cooling block and has a simplified storage of the heating wire and the grid · Furthermore, an electron gun be created, the heating wire of which is a longer period of use s.

The well-known electron guns, electron guns or electron syringes have a heating wire, a grid and an anode, which are kept by storage are mutually axially aligned and enclosed in a housing that are evacuated by pump

can"

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can. The relationship between these individual parts and, in particular, the way in which these individual parts hurry are mutually arranged inside the housing, is designed in all known electron spinners in such a way that that the electron emission levels collided change when the electron gun warms up. This change in the radiation properties is caused by the Heat expansion and contraction of the various Individual parts of the electron gun cause. In particular, such a change is made possible by the Storage that was previously used to hold the filament and the grid in the electron gun to set up.

With the invention most of the difficulties those caused by expansion and contraction previously created, fixed. The invention creates an El ektronensc.nl euder in which a predetermined and uniform relationship between the electron surface area and the grid opening is maintained.

The electron gun according to the invention with axially aligned filament, grid and anode

a) by a heat sink block or cooling block made of two Half-parts made of a solid, heat-resistant,

electric

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electrically conductive material and the their front end sections on the Fluch.tungsach.se of the device lie against one another, each half part having a cooling device and between the two halves an uninterrupted layer of a solid, heat-resistant, electrically non-conductive material is available;

b) by a solid, ⁱ Heat-resistant indigenous electrically conductive anode support with an existing passage in its center;

e) by a solid, heat-resistant, electrically non-le:> Fixed spacer ring that is in its center has a passage and both the anode support in Keeps a distance from the cooling block and also axially aligns the passage of the anode support with the alignment axis;

d) through a filament with a crown portion and two leg portions, each leg of which with someone else. Half part electrically connected and the Apex portion is aligned with the alignment axis;

e) by a grid structure with a grid which has an opening or bore in its central portion and that arranged near the filament transversely to the device axis

is arranged so that this bore or opening is coaxial runs with the axis of the electron gun, the lattice structure also having a lattice girder, which protrudes from the cooling block to adjust the grid and the grid with an electrical voltage to connect, and

f) by an anode which is assigned to the anode support and is coaxial with the axis of the electron gun.

The invention is below. Hand of the drawings · In the drawings is

1 is an exploded perspective partial view of an embodiment of the klektronenstrahlerzeu— gers;

FIG. 2 is a plan view along line 2-2 of FIG

Fig. 3 is a vertical section along line 3-3 of Fig. 2;

Figure 4 is a view taken along line 4-4 of Figure 1;

FIG. 5 is an enlarged cross-section along line 5-5 of FIG. 3;

6 is an enlarged vertical section along line 6-6 of FIG. 4, with some edge portions broken away. chen are;

Fig. 7 is an enlarged vertical section along line 7-7 of Fig. 2, with some edge portions broken away are;

Fig. 8 is an exploded view of the flaüeÄa ^ sfüiirig ;;

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Flg. 9 shows a modification of the central zone of FIG. 4;

10 is an enlarged vertical section according to Line 10-10 of Figs. 9 and

Fig. 11 is an enlarged vertical section the central portion of the filament jacket or filament sheath.

The electron gun shown in Figs has three main parts: a heat sink block Or cooling block 14, an anode support 15 and a spacer ring 13 »

The heat sink block or hollow block 14 consists of the two half-parts 14 A and 14 B and one uninterrupted Layer 16 of solid, heat-resistant, electrical, non-conductive material (Fig. 6). Layer 16 ± st preferably as thin as possible. Each half part i4a and i4b consists of a solid, heat-resistant, electrically conductive material such as metal or the like, preferably made of aluminium. The half parts i4a and i4B are with Provide cooling facilities.

In the embodiment shown in FIGS. 1 to 8 takes place cooling (Fig. 3) by air cooling using radially directed, axially spaced apart, parallel ribs 17 for the half part 14a

and

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and ribs 18 for the half part 14 B. Instead of with air the half parts i4a and 14B can also be filled with liquid are cooled via appropriate passages (not shown) in the cooling block 14 in FIG Is circulated.

The half parts i4a and i4b are designed so that their front end portions 82 and 83 on the alignment axis 19 of the electron gun 10 to one another lie «In the embodiment shown, the center or axis of the half parts i4a and i4b coincides with the Alignment axis 19 of the device 10 together, however, it is only necessary that the half parts i4a and 14B in closer Contact each other at a single point 21, which is on the axis 19 ui front. End of the cooling block 14 is · Preferably, the central axis of the cooling block 14 coincides with the alignment axis of the device at position 21 together

The layer 16 can be made of a conventional solid, heat-resistant, consist of electrically non-conductive material. If the half parts i4a and i4B are made of metal, e.g. made of aluminum, then the surface parts of the aluminum are anodized so that i4a and 14B a layer 22 or 23 of aluminum oxide is present. · Such an anodized layer has very good dielectric properties and is a good barrier

s chi t

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layer for the electric current. For layers 22 and 23, a layer 24 of epoxy resin "can be used to complete layer i6". This layer 24 not only serves as an additional, non-conductive barrier layer between half-parts i4a and i4b, but also sticks <li "half-parts i4a and i4B together and connects these parts to one another, so that with this embodiment a cooling block 14 is created which has a monolith-like structure. Depending on the type of design, the half parts i4a and 14B can be connected to one another by a preferably non-conductive clamping device (not shown).

At a distance from the layer 16, in each half part i4a and i4b of the embodiment shown, a respective channel 26 or 27 is arranged. The channels 26 and 27 are mounted in such a way that an assumed line running through the middle of the channels marks the axis 19 of the frame. ates 10 cuts. Only a single channel is necessary in one or the other half-part 14a or 14B. In the embodiment shown, there are two channels to facilitate the centering described below.

The anode support 15 consists of a solid "heat"

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Resistant, electrically conductive material, e.g. metal Or the like., Preferably aluminum. The anode support 15 shown has a passage 28 through which the anode support interspersed lengthways and in the middle. The passage 28 is coaxially aligned with the axis 19. In the illustrated Execution, the anode carrier 15 has a foot part 29 consisting of one piece with the carrier, from which to the rear a spacer sleeve 30 located on the circumference and extending in the circumferential direction protrudes .. With The foot part 29 is made of one piece and there is also a rearwardly projecting support tube 32 which forms the walls of the passage 28 bUrtet. In the embodiment shown the support tube 32 has a Gfe-Windeabsciinitt on its inner wall 33 on · In the spacer sleeve 30 is a Bore or opening 34 present so that the between sleeve 30 and tube 32 Existing Köaa & er36 with ■ - by means of a vacuum opening (not shown) leäüöfit ■ ■ Jlijtft »* - can be woken up empty when the device; 10 «ss? & E" iten ^ ty

gen MatteJ * Lal beöUehettde -A ^ s ^ anAs ^ iai ^ "13 tett # itt * Ma * te! bore 37 «

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the axis 19 of the device 10. The rear surface 38 • the spacer ring 13 has a recess for receiving of the front sections of the half-parts i4a and i4b »The Spacer ring 13 has a in its front surface 4i on the "circumference existing shoulder 39 to accommodate the Ab stand 30.

In the embodiment shown, the half parts are i4a and i4B, layer 16, spacer ring 13 and the Anode support 15 made of a material impermeable to gas. To maintain a gas-tight state between the spacer ring 13 and the adjoining cooling block 14 or the anode filter 15 is the cooling block 14 and the opposite surface of the anode support 15 each provided with an annular groove 42 or 43, in which it is expedient dimensioned sealing rings 44 and 45 are used. When the device 10 is assembled, it is possible during of working the cooling block 14, the spacer ring 13 and the anode support 15 are exposed to the outside air.

The anode support 15 is conventionally connected in a gas-tight manner to a pipe part or pipe 74, which becomes a other equipment part (not shown) belongs. With a sealing ring 75 is a gas-tight connection between

« ^R tables the tube 74 and the anode carrier 15 produced.

Sin

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An electron beam generated by the device 10 can thus be directed to a target surface via the tube 74 will. The chamber 36 is when the device TO evacuated by means of a vacuum pump (not shown), which is attached to the existing in the anode support Opening or bore 34 is connected.

In aligned bores 7 *> and 78 or in aligned Hole pairs 7 ° and 78 in the cooling block 14 or »in the spacer ring 13, a bolt and nut connection (not shown) is inserted around the spacer ring 13 to connect to the cooling block 14. The anode support 15 can in the same way with the spacer ring by a screw bolt connection: ·; (not dnrge <divides) connected, with holes or drilling parts 88 are used, those of the existing in the spacer ring 13 Holes 78 spaced 90 ¥ inch apart stand.

A hairpin-like heating stitch 47 with a parting 49 and two legs 48 extending from the apex across the front end of the cooling block 14, one leg 48 with the half part 14A and the other Leg is connected to the half part 14B. For loading

Fixing are in the half parts 14a and 14B Bohrunr ^ n present, dif i'x. ^ rit speaking leg 48 of the heating—

thread 47

909842/0843 .. "" ad original

thread 47 (Fig. 7). To set the position of filament 47 with respect to cooling block i4 in the half parts 14A and 14B two diametrically opposed j radially directed bores 51 or 52 available » Each bolt 51 and 52 has one leg 48 of the filament 47 in «connection. When plug 53 inserted into the bores 51 and 52 and then against the legs 48 are printed with maggot roughening 54, then animals' thighs. 48 clamped against the Vfnnxi of the facing Hailbteils 14A or i4b, so that on

^l the heating wire 47 is held firmly in the cooling block.

ir plate 49 of the filament 47 is aligned with the axis tS ^ äes Seirätes 10. The legs 48 are electrically connected with buckets : Ha3übefceil 1i4a or 14B * The filament can be miss jjse <3: any material suitable for this purpose ^ »B. from ^ o ^ lfraim ^ wire or ribbon), or * from a

.der iSeJtziaänen ^ in; <teJi iEffiiMiÄOfe ik:

it is close to the alignment axis 19 of the device 10 and close to the grid 16. This flat surface stands perpendicular to the alignment axis 19 and stands also perpendicular to the opening 57 of the grille 56. A Such a flattened or warp-free heating wire 47 (Fig. 10) is used in the preferred embodiments, one with a flattened or domed apex 49 provided heating wire 47 concentrated in the electrical nenschlutern 10 and 10 'the emission of electrons from the apex zone 49 of the heating wire.

A scheifaenähnliches grating 5b known from one in the art and suitable material such as stainless steel, there has, in the illustrated in FIGS. 1 to 8 run in its central portion 58 a, the center opening passing through the central portion 58 is 57 · thinner than the adjoining circumferential section *

•
In plan view, the grid 56 has an elliptical shape and is provided with two bores 62 near the opposite end of its longitudinal axis 61, each bore lying on the longitudinal axis 61. The opening 57 penetrates the center of the grating 56 and therefore also lies on the longitudinal axis 61. A pin is located in each bore 62 (FIG. 8). A sleeve 64 lies over each pin 63.

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As the device 10 is assembled, each pin 63 becomes and each associated sleeve 64 is pushed into a respective channel 26 and 27 and is covered with one made of epoxy resin or the like Putty 85 cemented in. A jig (not shown) holds the pins 63 and the sleeves 64 during cementing in their places.

Before being cemented in, each pin 63 is connected to a conductive wire 71 which is so long that it penetrates the associated channel, for example the channel 26 and protrudes from the channel 26, so that an electrical Connection can be established. Grid 56, Pins 63 and wire 71 are made of electrically conductive material. The sleeves 64 and the putty 85 are made made of an electrically non-conductive material or of insulating material «

After the sleeves 64 and pins 63 have been properly installed in place, the protruding portion of each pin 63 is pierced in the direction of the diameter to create two parallel bores 67 and 08 which pass through the pins in the transverse direction. In each pin 63 there is a bore 68. After sliding the grid 56 over the protruding ends of the pins 63, the bores 68 are aligned with the corresponding bores 67 in the grid 56 _r so that the grid 56 is at a correct distance from

to the

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the heating wire 47 and the cooling block 14 is held. The grid 56 wira in the desired fixed Position on the protruding ends of the pins 63 held by a wire 69, the opposite of which End sections are bent so that they penetrate the bores 68 and 67 and in this way the grid hold in the desired room position. The central portion of the wire 69 can be in the assembled Device 10 on adjacent sections of the spacer ring 13 rest, so that the spacer ring 13 prevents the wire 59 from falling out of the bores 67 and 68.

To change the grille or to carry out other repairs on the device, the Drpht 69 is disassembled The η device taken is simply pulled out and then the grille 56 is removed from the cooling block 14.

In the embodiment described, the grille 56 can easily be centered over the heating wire 47. As soon as the

in

Pins 63 and the sleeves 64 the channels 26 and 27 have been inserted, the wire 71 is also insulated from the walls of the semiconductor i4a (Fig.3), so that an electrical contact with the grid 56 of the rear portion of the cooling block i4 when Arbexten of the device 10 can be produced and thereby, the grid 56 on the desired tension in relation to aiii *

909842/0843 BAD original

the fie L ^ c * rah t is held.

The grid 56 is designed in such a way that the capacitor effects between the grid and the associated structure of the device 10 are kept to a minimum.

M ine made of known material such as stainless steel or the like. existing cylindrical anode 72 lies within the Passage 28 »Kin thread aoscimitt 73 of the outer wall the anode 72 is in the Gev / indabschnitt 33 of the support tube 32 screwed in from anode support 15 · One such Thread engagement not only enables manufacturing a fixed one. Connection between the anode 72 and the Support tube 32, but axich allows the choice of one desired fixed distance between the heating wire 47 and the anode 72 »The rear part of the Anode 72 hr + t a section 90 with a narrowed opening. This section 90 creates a desired one and preferred electric field for accelerating the electron current in the zone of the device existing grid 5b leaves.

In the spacer; 13 there are recesses for countersinking the screws and threaded nuts (not shown) which connect the cooling block i4 and the anode support 15 to the spacer ring 13.

In

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In Figs. 9 to 11 there is a modified embodiment an electron gun 10 'shown »

The difference between the embodiment shown in FIGS. 9 to 11 and the embodiment shown in FIGS. 1 to 8 consists in an additional heating wire sheathing or a heating wire sheath 80 between the grid 56 and the cooling block 14 is arranged. Two existing in d ^ r Case HO bores aligned with those present in the grid 56 holes 62 so dr-ß the pins 63 not only to Kinmitten of the grating 56, but also for centralizing the Heizdrahthülle 80 with respect to the cooling block 14 and the heating wire 47 can be used.

The heating wire sleeve 80 is ordered with a washer a solid, heat-resistant, electrically conductive material, e.g. made of aluminum, rustproof steel, molybdenum or the like. The surfaces of this disk are electrically non-conductive with a thin layer 84 (Fig. 1i) Coated conductive material that separates the shell 80 from the heating element 47, the grid 56 and a half-part of the cooling block i4 insulated. This insulating material can be any known substance. If the shell 80 is made of metal, e.g. B. aluminum, then that becomes easy Layer 84 is made by anodizing the surface of the disc. The middle of the Heizdreh.thülle 80 has a

Center hole 81

909842/0843 BATH ORIGINAL

" ¹⁷ " 156A310

Central bore 81 into which the Scheitei.1 k-9 of the heating threat • and the associated legs kS (Pig «10) protrude. The bore 81 runs coaxially with the axis 19 of the device 10l

The shell 80 is electrically connected to one of the half parts of the cooling block 14. This electrical connection can be made in a simple manner by using a screw 89 (Fig. 9) which does not have a isolated bore in the sheath 80 in a non-isolated channel (not shown), which is in the half of the cooling block i4 is screwed in is.

The sheath 80 or the jacket 80 is designed in such a way that the heating wire 1- + is shielded from dc-> s grid 56. The shell 80 restricts the movement of the ions that cause the Strive to have the heating wire legs 48 when working of the device 10 · to erode.

The circumferential direction around the bore 81 of the casing 80 giving lip is supposed to reduce the electrical capacity.

11 shows a section through a heating wire sheath 80 made of aluminum, the surface of which is anodized in order to provide the sheath 80 with a layer 8k of aluminum oxide

• 82 *.

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84 of any other suitable insulating material e.g. made of synthetic resin or the like. be shaped.

When working with the device 10 or 10 ^1, the anode and the anode support 15 are essentially kept at Krd tension. The cooling block i4 _f, the heating wire 47 and the grid 5 ° are kept at a high voltage, for example 20,000 V or higher, as desired or depending on the system; current flows in one half of the cooling block 14 over the heating wire 47 and out the other half of the cooling block. An electrical connection is made to the cooling block 14 by means of screw bolts (not shown) which penetrate the bores 76 (FIG. 1). The appropriate voltage for the grid 6 is obtained by applying the desired voltage to a terminal 77 which is electrically connected to wire 71 (Fig. 3).

The electron guns of the invention are self-accelerating, with essentially all of them Accelerating the electrons from the heating wire at their Movement is imparted from the grid to the anode. Since the Arbeitswf »i-jf» before. 'i.T' l: f ro ■ r ti iil.lerzeu ^ ern known i. = t and this operation does not form part of the invention, no further description is given here.

at

BATH ORIGINAL 90 98Λ2 / 0843

In known electron beam radiators, there is a Kelativbev-Pfomg of the filament to the grid opening. In this way, changes in animal entsteuen radiation as well as an asymmetrical ürosion of the filament. With the new Ausfiihnini; and bpponiiers in the use of the germinal thread sheath or the heating academy HO is essentially only the radiation surface ο the heating element surface on elec: troiit »nstrahlun, ii? temper; held door. This reduces the veins in the thigh areas and the ionic erosion of these hot plates. This ion erosion reduction is common in many applications in which relatively low vacuum conditions are used when working. That under this relationship; en voriiaiidejie Gas £ eiiüfjt to accelerate the lonenero-ioa of the usual hoizf adens, vcr /; common with

the state which exists et ami, v; enn the KlektronstrahlstiL.di ^
cr can be kept at a high level.

The distance between the holes into which the filament legs of the new device will be small held by reducing the insulation thickness of the cooling block in the zone which the filament legs receiving two holes separates. The heating wire can therefore be a simple hairpin-like one Au. '· Guide with very short sides and a sharp one Sciieitelr.-diui? for effective electron radiation "

These

909842/0843 ^

This heating wire design significantly improves the thermal resistance of the new device.

The new device can be used for cleaning purposes or for replacement parts can be easily taken apart. In the separated state, corrections, Changes, repairs, etc. in the shortest possible time run quickly.

Line depth when anodizing aluminum surfaces, as used in the new devices, ranges from about 0.005 cm to about 0.02 cm A 0 "(aluminum oxide)" A preferred thickness of the epoxy resin used to glue the two half-parts of the cooling block together is about 0.0005 cm to 0.0025 cm. ! Have been after these au two halves "this has joined together, can be edited ialbteil ** mffechinell to get an accurate iie; ic; J: un · - ·: zviscjicn the halves to se fien ^j...

The embodiments shown and described are only to be regarded as explanatory examples, which are modified in the context of the patent claims and abf-r τ -; ». !! · ¹ ■ ·.? t .- ^ W! >: x * c'l 1 1.,

Claims

ORIGINAL 909842 / 08A3

Claims (1)

Z 21 - 156431D Claims λ ») Electron beam generator marked with axially aligned heating filament, grid and anode a) by a cooling or heat sink block (i4) made of two Half parts (i4a, i4b), which are made of a solid, heat-resistant, electrically conductive material and which at their front end segments on the alignment axis (19) of the device (io) lie against each other, each Half part has a cooling device and an uninterrupted layer (i6) between the two half parts a solid, heat-resistant, electrically non-irritating gen material is available; b) by a solid, heat-resistant, electrically conductive capable anode support (15) with a passage (28) in its center; c) by a solid, heat-resistant, electrically not conductive spacer ring (13) »which has a passage (37) in its center and which both supports the anode support (i5) at a distance from the cooling block (i4) as well as the passage (28) of the anode support (i5) with the alignment axis (19) axially aligns; d) through a filament (1 * 7) with a vertex (49) and two legs (4-8), each leg with electrically connected to another half part (i4a, -i4b) and 909842/0843 _BA p and the vertex (4q) aligned with the alignment axis (i9) is; e) by a grid structure (56) with a grid that has a bore (57) in its central section (58) and arranged near the filament (47) transversely to the device axis is, so that this bore odfir opening (57) is coaxial with the Achpe (iw) of the Klektronjetgenerator runs, with the Giτ, teraul'bau also a lattice girder which protrudes from the cooling block (i4) to adjust the grid and the grid with an electrical Connect voltage and f) by an anode (72) which is attached to the anode support (l5) is assigned and coaxial with the axis of the electron beam generator runs. 2. Apparatus according to claim 1, characterized by a filament sheath (80) made from a sheet of solid, heat-resistant, electrically conductive Material between the grid (5i>) and the cooling block (i * 0 is arranged and in its center a Has a bore which runs coaxially with the axis of the device and into which the filament apex (49) protrudes, and by an electrically non-conductive device (22,23) »the plate from the filament, the Lattice and one of the half parts (i ^ A, i4b) isolated. BATH ORJGINAL 909842/0843 3 · Device according to claim 1, characterized through a (knight yield provision (63 »t> 4, 85) with a Connection device for releasably attaching the grid. h,! electron gun with relatively gerin- gen heat deviation intrinsically soil aft en Heizfadenverwendunpsdaiier and long, axially aligned with .he filament, grid and anode, characterized by a) a cooling block (ι ² +) · made of metallic half parts (i ^ A, i4b) which m their front sections r.uf the axis ^ 19) of the Gprätos (lO) rlipgpn, f furthermore each calf part has a r ^ ine cooling device and one of the half parts includes an axially directed channel; b) by an uninterrupted layer (16) of one solid, wärmebpf-tandigpii, gas-impermeable, electrical non-conductive material between the half-parts (i4a, 14B) lies; c) by a mctalli.sclien Ano <Ienträ ;; pr (i5) niit a passage (28) present in its center; d) by means of a solid, heat-resistant, gas-impermeable, electrically non-conductive spacer ring (13) with a bore in its Mhtte, the spacer ring holding both the anus support (15) at a distance from the cooling block (i4) and the passage axially aligns with the Actise (19) of the device 909842/0843 e) by a hairpin-like heating wire (^ 7) with a vertex (k ⁽ j) and two connecting legs (k8) , where the vertex (k?) is aligned with the axis (19) of the device and each leg (ktt) with each one end of a half part (1 ^ A or i4b) connected i. ^c t; f) through a grid (56) close to it with a passage in the middle section, the grid (56) near the wire (^ 7) being arranged transversely to the axis of the device so that the passage coaxial with the axis (icy device vc-ri Miii't 5 { ^r ,) through a no between ün · (Utter (5ί ') and the cooling block (i'O vorh uidc'iic grid>rtra;._; device (63 , 64,85) with an electrical line that stretches from the grille through the canal, and with an '7eii Isolicrvorric ituii, r, dif on head of «om Kühl b J ock isolifii't, voboi d <-r I ^ itf-r and di'1; nlicrvoiTinhtimi ¹ ;, 'jemein.vc.rn a giiKundurcLl'- i-fri ^ r J; ichtun · "·; form with the Uärmesenlcblock; h) by a cylindrical ar ο de (7'0? tue with dom anode support vrrbunt'r-n and is arranged coaxially to the axis of the device, and i) by a device (44, 4) »which the cooling block (l4), the layer (ΐυ), the Anodenträ ^ he (l5) the Abstan'isrin;? · ¹ (13J in a p ;; sunaurchlässi jjen position to each other holds. 909842/0843 la. - «AD 5 · Device according to claim 4, characterized by a filament sheath (& O) from a plate a solid, heat-resistant, electrically conductive Material placed between the grille and the cooling block with a hole in its center, which runs coaxially with the axis of the device and into which the filament apex (^ 9) protrudes, and through an electrically non-conductive device that separates the plate from the heater, the grid and one of the Half parts (i4a, i4B) insulated. 6. Electron beam generator with relatively low heat dissipation properties and long filament— Period of use during which the filament, grid and anode are axially aligned, indicated by a) a cooling block (i ^) made of metallic half-parts (i ^ A »1 ^ -B), at their anterior portions on the Axis (19) of the device (io) lie against one another, furthermore each half part has a cooling device and one the half-part includes an axially directed channel; b) by an uninterrupted layer (16) of one solid, heat-resistant, gas-impermeable, electrical non-conductive material sandwiched between the half parts (14A, i4b); c) by a metallic anode support (-15) with a in its center there is a passage (28); BATH 90984270843 d) by a solid, heat-resistant, gas-impermeable, electrically non-conductive spacer ring (13) with an existing hole in its center, the spacer ring both the Ano (lentrager (15) in the Abstaid to the cooling block (i4) as well as the J) passage axially aligns the axis (19) of the device; e) with a hairpin-like heating wire (47) a Schoitel (4y) and two connecting legs (48), where the vertex (^ 9) coincides with the axis (19) of the Device is aligned and each leg (48) is connected to one end of a half-part (i4a or i4b); f) through a disk-like grille (56) with a passage in its middle section, the grille (5t ·) near the heating wire (47) being arranged transversely to the axis of the device so that a passage runs coaxially with the axis of the device ; g) through a grid support device (63 »64,85) present between the grid (;> 6) and the cooling block (i4) with an electrically conductive guide device that extends from the grid through the channel, and with an electrically non-conductive insulating device which insulates the conductor from the cooling block (i4), the conductor and the insulating device together forming a gas-impermeable seal with the heat sink block h) by a cylindrical A _n ode (72) connected to the the wearer AnOi- and coaxial with the axis of the apparatus arranged 909842/08 43 BAD OTOQiNAL is arranged; i) by a device (44, 45), which the cooling block (1 '»), the S Cj i cht (i6), the An ο dent rä c; er (15) and the Distance sr inc; (13) in a gas-impermeable position holds to each other and j) by a filament sheath (80) made of a plate made of a rusting, heat-resistant, electrically conductive material, which is arranged in the middle of the grille and the cooling block and in its center a hole which is coaxial with the axis; the device extends and protrudes into dd * dor Ueizi> denscheitel (49), and an electrically non lciti'ähige Einridtung that the plate of dom filament (47), the grid (56) and one of the half portions (14a, 14b) isolated" 7 «A device according to claim 6, characterized by a Gittertrngvorriclitun, · (62p4,85) with a connecting means for readably Bei'c Stipen of Gitt-ers _e M 1994
Ho / p. ORIGINAL 909842/0 8 43