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Патент USA US3082350

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March 19, 1963
D. W. HAWKINS
3,082,346
RESILIENT GETTER SUPPORTING ARRANGEMENT
Filed May 19. 1960
‘
INVENTOR:
-
DARYL W. HAWKINS,
‘ awjul?jsaiome
States
ice
3,082,346
Patented Mar. 19, 1963
1
2
3,082,346
be pointed out with particularity in the claims annexed
to and forming part of this speci?cation.
In carrying out the objects of my invention I provide
RESILIENT GETTER SUPPORTING
ARRANGEMENT
Daryl W. Hawkins, Schenectady, N.Y., assignor to Gen
eral Electric Company, a corporation of New York
a cup~like cathode member including a closed end.
5 Mounted ?at on the end surface of the cathode mem
Filed May 19, 1960, Ser. No. 30,154
10 Claims. (Cl. 313-180)
My invention relates to electric discharge devices ‘and
pertains more particularly to a new and improved getter
supporting arrangement for use therein.
Some electric discharge devices include cathode struc
tures having a getter arrangement supported thereon in
order to enable utilization of the cathode heating element
for heating the getter to a temperature at which it will
effectively sorb undesired gases in the envelope of the
ber is a plate-like support member including a plurality
of outwardly extending and expansible projections and
having only the outer ends of the eXpansible projections
secured to the cathode member. Mounted ?at on the sur
face of the support member and inwardly disposed rela
tive to the projections is a plate-like getter element. The
getter element is secured to the support member at only
a restricted central portion. Additionally, the material
of the support member is essentially non-alloying with
respect to the materials of the cathode member and getter
element.
For a better understanding of my invention reference
may be had to the accompanying drawing in which:
FIGURE 1 is an enlarged partially sectionalized illus
device. One form of such arrangement heretofore em
ployed includes a cup-like cathode member formed of a
metal such as nickel having welded to the closed end
thereof a thin plate of ‘a highly refractory metal. Bonded 20 tration of a cathode and getter arrangement constructed in
to this thin plate is a thin plate of getter material. The
accordance with an embodiment of my invention; and
intermediate plate is formed of a material which is non
FIGURE 2 is an enlarged fragmentary perspective and
alloying with respect to the materials of the cathode mem
partially sectionalized view of the structure of FIGURE 1.
ber and getter. At relatively low cathode operating tem
Referring to FIGURE 1, there is shown an embodiment
peratures this arrangement can serve to support the getter
of my invention including a cathode structure generally
material in essentially non-alloying relation to the cath
designated 1. The structure 1 can include a cup-like cath
ode member and without introducing distortion problems
between the joined dissimilar metals.
However, at substantially increased cathode tempera
tures and under tube operating conditions requiring fre
quent turning of the device on and off expansion differ
ences between the various elements can result in defor
mation, such for example, as out-of-roundness of the cath
ode member which, in turn, can adversely affect the inter
electrode spacing between the cathode and a cooperating
electrode, such as a grid. Additionally, the thermally
caused stresses sometimes have the effect of tearing either
or both the interposed member and the surface of the
cathode member on which the getter arrangement is
mounted. Still further, at the mentioned elevated tem 40
peratures minute perforations in the interposed member,
‘which are sometimes caused by the Welding operation
whereby that member is secured to the cathode, often
prove large enough to enable the diffusion therethrough
of the getter material with resultant undesirable alloying
of the materials of the getter and cathode members. This
undesirable alloying sometimes is.also made possible by
the mentioned tearing of the material caused by high
internal stresses due to diiterent expansions.
My invention contemplates the provision of a cathode
and getter support arrangement wherein the getter ele
ment is supported on a cathode member in desirable high
thermal transfer relation and by an interpositioned ele
ment in a manner which will avoid undesirable alloying
between the elements of the arrangement and will avoid
thermally-caused distortion and fracture of the elements.
Accordingly, the primary object of my invention is to
provide a new and improved getter supporting arrange
ment.
Another object of my invention is to provide a new
ode member 2 formed preferably of nickel and mounted
on a cathode shield or support member 3. Contained in
the cathode member 2 is a suitable heating element 4
which is adapted, when energized, for rendering the outer
cylindrical surface of the member 2 emissive. This
outer cylindrical surface can be provided with a coating
of an electron emissive material or the member 2 can
be formed of material adapted for readily emitting elec
trons when heated. It is to be understood from the out
set that while I have shown and described the member
2 as an integral cup-like element it can alternatively be
a fabricated member including separately formed and
suitably joined side wall and end wall members.
The top or end wall of cathode member 2, as viewed
in FIGURE 1, comprises a planar surface 5. Mounted
on the surface 5 is a getter support member generally
designated 6. As seen in FIGURE 2 also, the getter sup
port member includes a plate-like central support portion
7 which is superposed on the surface 5 of the cathode
member. The portion 7 can, from the heat transferring
position, be advantageously in contact with the cathode.
However, the portion 7 is in no way directly secured to
the cathode member.
Included in the support member ‘6 and extending
radially from the portion 7 thereof are a plurality of cir
cumferentially spaced projections 8 which, as seen in
FIGURE 2, can advantageously be six in number. The
projections 8 are formed as loops which include radially
spaced inner and outer leg 9 and'lil, respectively, de?ning
bight portions extending parallel to the longitudinal axis
of the cathode member. The inner legs 9 are integral
with the rim of the plate-like support portion 7 and the
outer legs it? include flat tabs 11. The tabs 11 are gen
erally co-planar with the support portion 7 and are spot
welded as shown at 12 to the surface 5 of the cathode
member.
and improved combined cathode and getter supporting
arrangement.
Secured to the upper surface of the support portion 7
Another object of my invention is to provide a new
of the getter supporting member is a plate-like getter ele
and improved combined cathode and getter supporting
arrangemnet including improved means effective for 65 ment 13. As seen in both FIGURES 1 and 2 the getter
element 13 corresponds generally in area and con?gura
avoiding undesirable alloying of the ‘materials of the
tion
to the support portion 7. Also, the getter element is
getter and cathode elements and for avoiding undesirable
secured to the supporting portion by a metallic bond indi
thermally-caused distortion and fracture of the elements.
cated at 14 which is restricted to only a relatively small
Further objects and advantages of my invention will
central area of the joined members.
become apparent as the following description proceeds;
In the arrangement described to this point any ther
features of novelty which characterize my invention will
mally-caused distortion between the supporting portion 7
3,0 ‘12,346
3
and the getter element 13 is minimized by the restricted
central bond 14. Additionally, no thermally-caused dis
tortion can be transmitted between these portions of the
getter element and support portion through the radially
extending loops because of the construction of the loops
which allows for relative expansion and contraction move
4
ment secured to the surface of said support portion oppo
site said ?rst-mentioned member.
2. A cathode and getter supporting arrangement for an
electric discharge device comprising, a cathode member,
a getter support member including an imperforate planar
central support portion superposed on a surface of said
cathode member in heat-transferring engagement there
with, and a plurality of outwardly expansible projections,
only the outer ends of said projections being secured to
cathode will not be transmitted to the supporting portion
said cathode member, and a getter element secured to the
10
7 of the getter element 13 because of the expansible con
surface of said support central portion of said getter sup
struction of the loops 8. Conversely, if any thermally
port member opposite said cathode member.
caused expansion or contraction of the portion 7 of the
3. A cathode and getter supporting arrangement ac
supporting member or the getter element '13 should re~ I
cording to claim 2, wherein said support portion and
sult, it will not be transmitted to the outer legs 10 and
tabs 11 of the supporting member, which tabs are the 15 getter element are superposed plate-like elements that are
joined by only a centrally restricted metallic bond.
only portions of the assembly directly secured to the
4. A cathode and getter supporting arrangement ac
cathode member. Therefore, no distorting stresses will
cording to claim 2, wherein said getter element is formed
be transmitted to the cathode member and the cathode
of a material readily alloyable with the material of said
member will be unaffected.
cathode
member, and said support member is formed of
20
The getter element 13 is formed preferably of a ma
a material which is essentially non-alloying with respect
terial selected from the group consisting of titanium,
to the materials of said getter element and said cathode
zirconium and alloys thereof, which materials are readily
member
and serves effectively as a barrier therebetween.
alloyable with nickel of which the cathode member 2
5. A getter support structure according to claim 2,
is preferably formed. It is undesirable that alloying of
materials occur and, therefore, I have formed the sup 25 wherein said cathode is ‘formed of nickel, said support
member is formed of a material selected from a group
porting member 6 of materials selected from the group
ments of the legs 9 and 1G de?ning each of the loops.
Thus, any expansive or contractive movements of the
consisting of molybdenum, tungsten, tantalum and alloys
thereof; which materials are characterized by generally
high thermal conductivity and are essentially non-alloying
consisting of molybdenum, tungsten, tantalum and alloys
Additionally, in my improved structure the only weld
ing between the getter support and cathode members oc
electric discharge devices comprising, a cup‘like cathode
thereof, and said getter element is formed of a material
selected from the group consisting of titanium, zirconium
with respect to both the getter materials and the cathode 30 and alloys thereof.
6. A cathode and getter supporting arrangement for
member material.
member including a planar end surface, a getter support
member including a plate-like central support portion ex
cathode member; the tabs are remotely located relative 35 tending parallel to said end surface of said cathode mem
ber and ‘having a plurality of peripherally spaced outward
to the getter element. Thus, if any minute perforations
projections, said projections comprising loops extending
in the tabs 11 should result from the welding operation
generally transverse the plane of said support portion,
there can be no danger of alloying the getter material
only the outer end of said loops being secured to the end
and the cathode material by diffusion of the getter ma
terial through the weld perforations. Furthermore, in 40 surface of said cathode member, a plate-like getter ele
ment disposed in the space de?ned by said projections
asmuch as my improved structure includes no bonding
curs between the tabs 11 on the support member and the
of substantial planar surfaces there are no resultant high
stresses which can cause distortion of elements and tear
ing of the surfaces of the cathode member or the edge
of the interposed getter support portion which would ex
pose the structure to alloying of the getter and cathode
materials through the torn edges.
It is to be understood that while I have shown the sup
porting member 6 as being circular, it can have any de
sired con?guration. For example, it can be rectangular.
Additionally, it need not be mounted on a cathode sur
face. Instead, it can be mounted on any heated surface
in a device, such, for example, as the support member 3
in FIGURE 1. Additionally, the support portion of the
member 6 need not be planar but can be shaped to con
form to the surface upon which the member 6 is mounted.
While I have shown and described a speci?c embodi
ment of my invention I do not desire my invention to be
limited to the particular form shown and described, and
I intend by the appended claims to cover all modi?cations
within the spirit and scope of my invention.
What I claim as new and desire to secure by Letters
Patent of the United States is:
1. A getter arrangement for an electric discharge de
vice comprising, a member adapted for being heated dur
ing normal operation of the device and including a planar
surface portion, a getter support member including an
and bonded to the surface of said support member oppo
site said cathode member at only a centrally restricted
region.
7. A cathode and getter supporting arrangement for
electric discharge devices comprising, a cup-like cathode
member including a nickel planar end surface and con
taining a heating element, a molybdenum support mem
‘oer including a disc-like central support portion super
posed on said end surface of said cathode, said support
member including a plurality of circumferentially spaced
radial projections comprising loops extending generally
parallel to the axis of said cathode member and having
radially spaced inner and outer leg portions, the outer
leg portions of'said loops including tabs coplanar with
said central portion and being the only portions of said
support member bonded to said cathode end surface, and
a titanium disc disposed in the space de?ned by said
projections and bonded to the surface of said support
member opposite said cathode member and at only a
central restricted region.
8. A getter structure comprising a getter support mem
ber including an imperforate central support portion, a
plurality of peripherally spaced projections formed off
the rim of said support portion, each of said projections
comprising an integral loop extending transverse the
plain of said support portion and having an inner leg
integral with said support portion and an outer leg ra
imperforate planar central support portion superposed
on said planar surface portion of said ?rst-mentioned 70 dially spaced from said inner leg, and a getter element
secured to the surface of said support portion between
member and in heat-transferring engagement therewith,
said loops.
and a plurality of discrete outwardly expansible projec
9. A getter support structure comprising a getter sup
tions extending from said central portion, only the ends
porting member including a plate-like central support
of said projections being secured to said planar surface
portion, a plurality of peripherally spaced projections
portion of said ?rst-mentioned member, and a getter ele
3,082,346
formed o?? said support portionfeach said projections
being outwardly expansible relative to said support por
tion, and a plate-like getter element corresponding gen
erally in con?guration to said support portion and being
joined thereto at only ‘a limited central region.
10. A getter support structure comprising a getter
6
‘at only a limited ‘central region, and said support portion
and getter being formed of essentially non-alloying ma
terials.
References Cited in the ?le of this patent
UNITED STATES PATENTS
support member including a disc-like ‘support portion, a
plurality of circumferentially spaced and radially ex
pansible mounting projections formed 01f the edge of
said support portion, a disc-like getter element super 10
posed relative to said support portion and joined thereto
2,547,200
2,900,549
2,932,759
2,941,109
Dorgelo ______________ __ Apr. 3, 1951
Doolittle ____________ __ Aug. 18, 1959
Shepherd ____________ __ Apr. 12, 1960
Senior et al. _________ __ June 14, ‘1960
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