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Патент USA US2095337

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Oct. 12, 1937.
2,095,337
E. P. LOPPACKER
VA‘CUUM TUBE ELECTRODE
Filed Nov. 14, 1934
INVENTOR
‘PM
Patented Oct. 12," 1937 >
{2,095,337
UNITEDi-Si as
PATENT oFFieE '
p’ 2,095,337
' VACUUM TUBE ELECTRODE
‘Everett PsLoppacker, Bloom?eld, N. J.
, Application November 14, 1934, Serial No. 752,929
2 Claims.
(Cl. 250-275) '
This invention relates to an improved electrode
manner described avoids the necessity for a joint
connecting the top ‘to the side wall, as well as
the necessity for a vertical joint in the side wall,
for‘ vacuum tubes used in, radio and related'arts.
A primary object of the invention is to provide
an electrode element formed from a single piece
5 of homogeneous material entirely free from any
joints whatever.
i
and has the following advantages:
'
1.-Acc‘uracy of manufacture
V
V V
5'
In accomplishing this object the electrode is
By stamping the cup fromsa single’ sheet of
?rst stampedsinto cup shape from a ?at sheet» metal the exact dimensions‘and alinement of the
.and theparts of the cup are then appropriately parts can be controlled within more narrow limits ‘
10 formedto yield the structure desired for the than where the'electrode is assembled from sev- 1Q‘
eral separate pieces.
Another object is to ‘reinforce the open end
particular
tube.
is
'
r‘
v
'
'
of the electrode by strengthening means, such as
a flange or bead, to increase its resistance to
15
distortion.
'
'
-
.
and rigidity than an assembled electrode.
'
Among other objects of the invention are the
production of an electrode having increased wall
area, and having great strength and rigidity, and
_ also being relatively free from microphonic noises.
20
An electrode assembled from separate pieces of
tin has slight looseness between parts that is
While preferred forms of the invention are dis
present from the beginning due to defective as- 20 ,
ser‘nbly, or which develops in use due to the expan
sion and contraction under repeated heatings and
coolings, especially where the tube is subjected
‘ departing from the spirit of the invention as
hereinafter set forth and claimed.‘
'
In the drawing:
.
-
_
_ to continual vibration as in an automobile radio.
.
_
No such looseness can be present in the one-piece 25
.
Fig.‘ 1 is a side elevation of a plate element _
embodying the invention.
15
>3.—-No Zooscness possible
closed herein for purposes of illustration, various
changes may be made in the structure without
25
2.-V-Strength I
. The‘one-piece electrode has greater strength
>
electrode of this invention.
‘
,
'
>
V .
Fig. 2 is a section on line 2-2 of Fig. 1.
Fig. 3'is a fragmentary vertical section.
30
Where a rolled tinner’s seam is used to "join
Fig. 4 is a fragmentary horizontal section.
separate parts, the rolling causes local stresses in 30
Fig. 5 is a fragmentary plan. view showing in 7 the metal, and these stresses cause'distortion of
detail the perforations.
V
the electrode when it is heated in the bombard
Fig. 6 is a perspective view of a modi?ed shape
of electrode.
35
'
7
‘7
'
Fig. '7 is afr'agmentary side elevation showing
5.——Aooids microphonic noises '
35
' For the reasons pointed out above the one
Fig. 8 is a fragmentary section showing a fur
piece electrode is free from many of the causes of
. microphonic noises in tubes, these noises causing.
Referring to the drawing more particularly, the rejection of a high percentage of tubes during -
a modi?ed top construction.
thermodi?cation.
>
'
_'
>
V
'
i
'
.
40 the electrode element illustrated in Fig. 1 is a
cup-shaped member comprising a cylindrical side
wall l0 and ajtop l I. .Thiscup-shaped member is
originally produced by stamping or otherwise
forming it from a sheet of suitable material. The
top H is then punched to give the formation
desired for the particular tube, and the side wall is
. perforated by any preferred method, as by a roll
’ ing operation, or these walls may be formed with
50 perforated protrusions I2, as illustrated in Figs.
' '
ment process and in use.
3 and '4. Parts of the side wall are leftimper
‘manufacture as well. as frequent cases of dissatis- 40
faction in use.
i
.
these ‘parts, as by spot welding.
'
'
.
_
55 " A one-piece homogeneous element formed in the
7
electrode it may be, formed with a ?angeilii, and if 7
still greater rigidity is desired a‘bead iilmay also
be used, or- eitherfbead’ or ?ange may berused 45
alone. This reinforcing of the open end of the
electrode cooperates with the'one-piece construc
tion to form a strong electrode that will hold its
true cylindrical form under repeated heatings.
Where the protrusions i2 are'used the inclosed 50
surface area is greater than where wire gauze or
forate, shown at l3, and are indented’ so that.’ flat perforated metal is used.
support'wires may be conveniently, attached to .
1
In order to further stiffen the open end of the
'
>Another way of increasing the surface area
is shownin Fig. 8 where the perforated side wall
is- formed with corrugations‘ I6, the ridges of '55
2
2,095,337
which run horizontally along the side walls of
the electrode.
The advantages of increased wall area are that
the tube runs cooler, gives less back emission
and gives a greater area for the electronic move
ment.
The present invention may be applied to elec
trodes of various shapes, one of rectangular form
being illustrated in Fig. 6, and the top may be
formed to suit the requirements of the tube, a
10
partly conical top being shown at I‘! in Fig. '7 ,
The electrode of this invention may be used
either as a “plate” or as a “grid”, and due to its '
rigid one-piece construction, it will maintain the
15
characteristics for which it is designed under all
temperatures and conditions of use.
I claim:
1. An electrode for a vacuum tube comprising,’
a top, a side wall connected with the top, most
of the area of the side wall being formed with
perforations, the continuity of perforations in
said wall being interrupted to provide vertically
extending imperforate parts of the side wall for
the attachment of support wires.
2. An electrode for a vacuum tube comprising
a top formed with an aperture, and a, cylindrical
wall having an open end and formed homogene
oils with the top, the top and side wall forming
a single piece free from joints, most of the area 10
of the side wallbeing formed with perforations,
vertically extending parts of the side wall being
bent inwardly and left imperforate for the at
tachment of support wires, the side wall being
bent into a reinforcing part extending circum 15
ferentially around the side wall adjacent the
open end.
E. P. LOPPACKER.
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