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Патент USA US2119795

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June 7, 1938.
E, RUSKA
AL
2,119,795
COMBINED ELECTRIC AND MAGNETIC DEFLECTING SYSTEM FOR OATHODE RAY TUBES
Filed June 6, 1936
$369.1. \
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Patented June 7, 1938
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COMBINED ELECTRIC AND MAGNETIC‘ D‘Ee
FLECTING SYSTEM FOR CATHODE RAY
TUBES
'
.
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»
Ernst Ruska and Erich Schwartz, Berlin-Zehlen
dorf, Germany, assignors to the ?rm of.
Fernsch Aktiengesellschaft, Zehlendorf,
near
'
Berlin, Germany
Application June 6, 1936, Serial No. 83,978
In Germany June 19, 1935
4 Claims. (01. 250-275)
The present invention relates to the construc- size that the‘ maximum outwardly de?ected ray
tion of the cross de?ecting systems used in cath-
One object of the invention is to provide a
de?ecting system which is characterized by its
19 particular simplicity and compact structure and
which at the same time may be produced by the
glass blowing art. It has hitherto been customary to fasten the individual electrodes to fused-in
tips or to arrange them in order on glass or
15 ceramic supports. Di?iculties arise however when
can just leave the plate without touching. 'In
plates (the anode potential in the ease of sym~~ '
metrically biased plates)7
The retaining yoke 4 of the de?ecting system 10
may be provided at the ray inlet side and 0on
centric to the passage portion of the ray, with a
conical or cap shaped ?tting surface 8 by means
of which the system can be centered on corre
sponding surfaces H) of the glass ‘base said ?tting 15 .
a large number of electrodes is used since the
surface 8 having a ?at base l8 ?xed to yoke 4.
position of the individual electrodes cannot be
maintained with su?icient accuracy during their
constructional positioning and after preliminary
The glass base consists of two concentric tubes
l2 and I3 which are fused together on the side
turned towards the screen. The conical portion
. 20 heating.
When the electrodes are positioned
with insulating elements interposed between them
the inexactness of adjustment increases as the
separation from the ?rst electrode forming the
reference surface increases, so that the last elec25 trodes embody unpermissible positional errors.‘
In accordance with the present invention two
de?ecting plates are fastened to a common sup-
is either ?tted into the inner tube l2 or onto the 20
outer tube l3 and its base plate l8 suspended by
means not illustrated, at three points on itsv pe
riphery, e, g, y means of wire loops and screws,
to three hooks or lugs on the outermost base
tube. Spreading springs M, e. g. four springs 25
made of nickel-beryllium alloy may be fastened
to the base plate I 8 so as to effect contact of the ‘
port by means of the insulating coil members used
conducting inner wall l5 which engages yoke 4'
for both de?ecting windings, the said support
and is concentric with tubes l2 and is with an .
30 serving to hold both halves of the de?ecting system in a rigid manner facing each other.
internal metal or high-ohmic coating l9 serving 30
subsequently to accelerate the already cross—con—'
The drawing illustrates by Way of embodiment
trolled cathode ray. The lead-in conductors [6
a tube in which the common support member is
leading to the de?ecting plates and coils as well
positionally adjusted through agency of a ?tting
as those carrying the anode voltage. are‘pre'ferably
35 surface of the glass wall of the tube.
Fig- 1 shows a section through a portion of the
base of the tube.
located at the fusion junction of’ both base tubes. 35
A small ray-concentrating collector coil, not
shown, may be disposed in the concentric annu
40 coordinate direction, are Wound on two insulating
coil bodies 2 which are coaXially 01‘ nearly C0axially disposed close to both sides of the ray and
end,
upon the mutually facing sides of which the two
electrically de?ecting plates 3 are fastened. The
Wards the screen-side end of the coil, the coil " 40
being surrounded
by anI iron jacket
open at that
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What is claimed is;
.
'
1, In a cathode ray tube,v de?ecting electrode
l5 coils are connected on the other side by means of mounting means comprising a reentrantly folded 45
a connecting member or yoke 4. This yoke per annular envelope portion, a conical supporting
se serves to eifect the entire adjustment of the and conducting element adapted to inwardly en- ‘
system. In the arrangement shown in Fig. 1 the gage said annular envelope portion, a bi-furcated
ray passes through the center of the yoke and. yoke ?xed to said conical element, a spool ‘of
o enters into the system. For this purpose the
yoke 4 is provided at that point with an opening
5 which is centered with respect to the system.
The plates 3 are suitably adapted to accommodate
the ray, that is, they have an inlet interval equal
5 to the ray diameter and an outlet interval of such
insulating material ?xed to each bi-furcated 50
portion of said yoke, a de?ecting coil wound about
each of said spools, and a de?ecting plate ?xed
upon each of said spools. '
2. In a cathode ray tube having an envelope
enclosing electrodes, electrode mounting means, 55
‘
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2
2,119,795
comprising a doubly reentrant annular stem por
tion formed in said envelope, a bi-furcated yoke
having divergent legs, a conical apertured mem
ber disposed centrally upon said yoke, an insu
lating spool disposed adjacently upon each yoke
leg, as de?ecting coil wound about each of said
spools, and a de?ecting plate disposed upon each
of said spools; said conical member being adapted
to ?t within said annular stem portion, and hav
ing means formed on said envelope wall adapted
to cooperate therewith to ?xedly constrain said
conical member.
3. In a cathode ray tube as described in claim 2,
?eld controlling means comprising plates ?xed
to each of said spools in approximate continuance
of and divergent from said de?ecting plates.
4. In a cathode ray tube having deflecting
means supported therein after claim 2, having
a conducting coating disposed inwardly upon the
tube walls, means for connecting said supporting
yoke to said conducting wall coating.
10
ERICH SCHWARTZ.
ERNST RUSKA.
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