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Nov. 6, 1962
F. A. ROMANO, JR
3,062,982
ELECTRODE ASSEMBLY SUPPORT
Filed Dec. 31, 1959
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FIG.3.
INVENTOR:
FRANK A. ROMANO,JR.
BY;Z0?+/~
HI ATTORNEY.
thee
3,0?2,982
Patented Nov. 6, 19162
1
2
3,062,982
the neck is an electron gun electrode assembly including
electron beam forming electrodes 8, 10 and beam de
?ecting electrodes 12, 14. The various electrodes are
positioned‘and supported relative to one another in any
ELECTRQDE ASSEMBLY SUPI’URT
Frank A. Romano, In, Syracuse, N.Y., assignor to Gen
eral Electric Company, a corporation of New York
Filed Dec. 31, 1959, Ser. No. 863,333
suitable manner, for example by insulating rods 16, 18
4- Ciairns. (Cl. 313-292)
to which the electrodes are secured.
The present invention relates to supports for electrode
assemblies such as electron guns of cathode ray tubes and
the like, and particularly to supports for such electrode 10
Suitable potentials
for the electrode assembly maybe supplied within the
envelope 2 in any suitablemanner, for example by leads
20 extending through the base 6' and stem portion of the
envelope.
'
assemblies having substantial mass, such as are frequently
At a position adjacent the forward, end of the electrode
found in industrial and military cathode ray tubes.
assembly, and at as many other positions along the elec
One problem in the construction of such cathode ray
trode assembly as may be desired, the electrode assem
tubes, and particularly those which are intended for op
bly is located and supported relative‘ to an envelope hear
eration under rugged environmental conditions such as 15 ing surface 22, such as the interior surface of the neck
extremes of acceleration and vibration, is that of provid
4, by supporting means to which the present invention is
ing adequate support for the electron gun portion of the
directed. The supporting means at each position includes
tube within the tube envelope. Especially when such elec
a plurality of individual supports 30, here shown as cir
trode assemblies are relatively massive, which is often
cumferentially spaced about the neck axis. The individ
the case in multiple beam or high precision tubes for mili
ual supports 30 are secured, as by welds 32, to a suitable
tary and industrial applications, the matter of adequately
bearing member 34 which may be an electrode itself. or
supporting the electron gun against displacement in a
an extension from an electrode, as here shown, or an in
direction transverse to the tube neck or electron beam
termediate member to which the electrode assembly is in
path during shock or vibration becomes particularly
turn secured.
vital. Further complicating this problem of support is 25
As best shown in FIGURE 2 each support 30‘ con
the fact that the supporting means for the electrode as
sists of a metal member including a root portion 38
sembly must be capable of being easily inserted within
which is secured, as by welds 32, to the bearing mem~
ber 34. Extending integrally from the root portion is
the tube envelope, the interior dimensions of which gen
erally are not precise, and the supporting means must
also be capable of withstanding the high temperatures
involved in tube manufacture and operation, and capable
of accommodating the expansions and contractions in
volved in excursions to and from such high tempera
tures.
I
30
a set of metal spring ?ngers 40, 42, here shown as two
in number. The ?rst ?nger 40 of each set extends out
wardly and then rearwardly from the root portion 38,
and resiliently engages the envelope bearing surface 22
formed by the neck wall so as to support and locate the
electrode assembly therefrom. The second ?nger 42 of
Accordingly, a principal object of the present invention 35 each set is also secured to the bearing member 34, prefer
is to provide improved electrode assembly supporting
ably being integral with root portion 38 and the ?rst ?nger
means for electron guns and the like which insures ?rm
4t), and the distal end portion of the second ?nger 42 is
support, particularly against displacements transverse to
also disposed for resilient engagement with hearing sur
the axis of the gun, and insures continuous precise posi
face 22, either by direct contact or, as here shown,
tioning of the electrode assembly even under rugged 40 through ?nger 40.
environmental conditions involving large accelerations or
The spring constant of the ?rst ?nger 40, by which
severe vibration.
Another object is to provide an improved support for
electron discharge device electrode means, which support
is simpli?ed in form, easily and inexpensively manufac
tured, and readily assembled, and which does not im
pede insertion of the electrode means into a tube en
velope.
is meant the ratio of the spring force exerted by it to
its displacement from its rest or neutral position, is made
relatively low, so that the ?rst ?nger 40 provides a rela
tively soft spring action. This facilitates easy insertion
of the electrode assembly into the tube envelope yet in
sures gentle support and proper location of the electrode
assembly within the tube envelope. The second ?nger
Another object is to provide improved centering and
42, however, has a relatively high spring constant, pro
support means for an electron gun electrode assembly 50 viding a relatively stiff spring action suitable for ?rmly
which is capable of withstanding severe shock and vibra
restraining any movement of the electrode assembly away
tion, together with the extreme temperatures encountered
from its desired location, and limiting to a minimum
in tube manufacture and operation, without permanent
amount its transverse displacement under conditions of
deformation or other damage.
shock and vibration.
These and other objects of the invention will be more 55
Desirably each second ?nger 42 is so dimensioned and
fully understood from the following description and the
arranged so that it need be deflected only a minimum
accompanying drawing wherein;
amount, if at all, during insertion of the electron gun
FIGURE 1 is a fragmentary view, partially broken
into the tube envelope. Each second ?nger 42 is also
away in axial section, of a'cathode ray tube having elec
dimensioned, however, so that its distal portion will en
trode assembly supporting means constructed in accord 60 gage the envelope bearing surface 22, either directly or
ance with the present invention;
as shown by pushing against the adjacent portion of the
FIGURE 2 is an enlarged view of the portion of the
?rst ?nger 40, as soon as there is any transverse displace
structure shown in FIGURE 1 and showing details of
ment of the electrode assembly more than a predeter
the electrode supporting means constructed in accordance
mined amount, thus bringing its stiif spring action into
65 play immediately and exerting a strong restraining force
with the present invention; and
FIGURE 3 is a view of one form of electrode support
against any transverse displacement of the electrode as
constructed according to the invention.
sembly from the centered or other desired position in
Referring to the drawing, FIGURE 1 shows a portion
which it is supported by the several ?rst ?ngers 40.
of a cathode ray tube embodying the present invention
Each ‘?nger may have any suitable shape, provided each
70
and including an envelope 2 having a tubular neck 4
?rst ?nger 40 is arranged for resilient contacting engage
closed at its end ‘by a stem covered by a base 6. Within
ment with the neck wall or other envelope bearing sur
3,062,982
the position relative to said envelope at which said elec
so as to resiliently center and support the electrode as
trode means is adapted to be maintained by said first
sembly with relatively light forces, and provided each
second ?nger 40 is arranged for prompt engagement with
an envelope bearing surface for exertion of its relatively
large restraining force upon any undesired transverse
spring member, said second spring member having a
larger spring constant than said ?rst spring member.
2. An electrode assembly for an electron tube adapted
to be enclosed within the envelope of the tube and com
prising a plurality of electrodes secured together, a bear
displacement of the electrode assembly. Preferably each
?rst ?nger 40 has a U-shape, the inner side 50 of the U
extending forwardly from the root portion 38 in a direc
ing member associated with said electrodes and forming
a ?rst bearing surface, and a plurality of supports adapted
tion generally parallel to the axis of neck 4, and the
outer side 52 of the U being longer and extending from
the bight 54 of the U rearwardly and gradually outward
ly into resilient engagement with the neck wall to its
distal end which is spaced rearward of the root portion.
This U-shape permits each ?rst ?nger 4% to cantilever
about both the bight portion of the U and the junction
of the shorter side 50 of the U with the root portion 38,
thereby permitting a larger range of resilient displace
to extend between said ?rst bearing surface and second
bearing surfaces associated with the envelope of the
tube, each said support having a root portion rigidly se
cured to said ?rst bearing surface, a ?rst spring member
extending integrally outward from each root portion for
resilient engagement with a second bearing surface, and a
second spring member extending integrally outward from
each root portion for resilient engagement with a second
bearing surface, each said second spring member having a
larger spring constant than the corresponding ?rst spring
member, and each said second spring member being di
inensioned and arranged for resilient engagement with
ment without incurring a permanent set or other damage.
Desirably the portion of each ?rst ?nger 40 which is
intended to contact the neck wall has a slight transverse
bow, or embossment 56, so as to be outwardly convex
a second bearing surface only upon movement of said
and thereby more nearly complement the cylindrical
curvature of the neck wall. Also preferably the distal
portion of the second ?nger 42 is positioned in the path of
inward ?exure displacement of the corresponding ?rst
?nger, so that the second ?nger does not directly contact
the neck wall, and hence need not be specially shaped
for such contact, but rather exerts its restraining force
on the envelope bearing surface 22 only through the ?rst 30
?nger.
The material employed for the supports 30 may be any
suitable metal which is capable of withstanding the high
temperatures involved in tube processing, and which is
suitably non-gassy, and preferably non-magnetic. One
material which has been found to be satisfactory for the
supports is a stainless steel such as the product of Inter
national Nickel Company known as “Inconel X.”
It will be appreciated by those skilled in the art that
the invention may be carried out in various ways and
may take various forms and embodiments other than
those illustrative embodiments heretofore described. It
is to be understood that the scope of the invention is not
limited by the details of the foregoing description, but
will be de?ned in the following claims.
What I claim as new and desire to secure by Letters
Patent of the United States is:
1. A support for the electrode means of an electron
4
trode means more than a predetermined amount from
face 22 when the electrode assembly is inserted therein,
electrode means more than a predetermined amount fromT‘"
the position relative to said envelope at which said elec
trode means is adapted to be maintained by the corrc~
sponding ?rst spring member.
3. An electrode assembly as de?ned in claim 2 where
in the distal end of the second. spring member of each
support is disposed between said ?rst bearing surface and
the ?rst spring member of the respective support and in
the path of inward resilient displacement by said enve
lope of the ?rst spring member of the respective support.
4. A support for a cathode ray tube electron gun com~
prising a metal strip having a root portion adapted to be
rigidly secured to an electrode of said electron gun and
having a resilient U-shaped portion, one side of said U
shaped portion being shorter than the other and extend
ing integrally outward from said root portion, the other
side of said U~shaped portion being adapted to contact
a restraining surface and be resiliently displaced inward
ly thereby relative to said root portion during ?exure of
said support, and said one side of said U-shaped portion
forming a resilient backup portion rigidly secured to and
45 cantilevered from said root portion, the distal end of said
backup portion being disposed in the path of inward ?ex
ure displacement of said other side of said U-shaped
portion, said backup portion being dimensioned and ar
tube, said support being adapted to extend between a 50 ranged relative to said other side of said U-shaped por
tion so as to be unflexed until said other side of said U
?rst bearing surface associated with the electrode means
shaped portion is de?ected a predetermined amount, the
and a second bearing surface associated with the enve
spring constant of said backup portion being greater than
lope of the tube and comprising a root portion adapted
that of said U-shaped portion.
to be immovably secured to one of said bearing surfaces,
a ?rst spring member extending from said root portion 55
References Cited in the ?le of this patent
for resilient engagement with the other of said bearing
UNITED STATES PATENTS
surfaces, and a second spring member extending from said
root portion for resilient engagement with said other
2,323,140
Lane _______________ __ June 29, 1943
bearing surface, said second spring member being dimen
sioned and arranged for resilient engagement with said
other bearing surface only upon movement of said elec
2,859,366
2,877,370
Squier _______________ _._ Nov. 4, 1958
Hanson _____________ __ Mar. 10, 1959
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