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Патент USA US2109274

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Feb. 2z, 1938.
Filed Nov. 19, 1935
Patented Feb. 22, 1938
2,1 09,274
riíans Niclassen, Berlini, Germany, assigner to
N. V. Philips’ Gloeilampenfabrieken, Eindho~
ven, Netherlands
Application November 19, 1935, Serial No. 50,487
In Germany November 12, 1934
4 Claims.
The inlet of electric conductors into an elec
tric discharge vessel is usually eiîected through
a glass press stem which after the sealing-in
operation is surrounded by a cylindrical or conical
5 part of the vessel wall. Since the glass at the seal
ing point always underlies internal stresses it may
readily crack. Once a crack occurs it very often
proceeds on roundabout so that the press stem
is detached from the remaining vessel. In this
lo case a sudden Very violent pressure equaliza
tion, a so-called implosion, often occurs between
the vacuum space and the open air. The initial
pressure difference forcibly pushes the press
stem into the interior of the vessel, thus caus
' ing rupture of the thin supply conductors. The
press stem almost immediately attains a high
speed so that it may crash the opposite vessel
wall and penetrates through it into the surround
ing space.
Particularly with oscillograph-tubes this in
volves a risk for the persons operating or ob
serving the tube, since in such tubes the vessel
wall which lies opposite the seal and carries the
luminous layer is very thin. As is well known
25 oscillograph tubes are also used for television
exhibitions and in this case the persons stay
closely in front of the luminous screen. In or
der to protect them it has already been proposed
to lodge such tubes in a completely closed hous
30 ing which comprises a thick splinter-proof glass
disc in front of the luminous screen. However,
this solution of avoiding the above risk is com
paratively expensive, .and at the same time it in
volves a weakening of the picture impressions
35 received by the spectator.
The present invention provides a simple means
for eliminating the risk of implosion with dis
charge tubes, thus allowing of dispensing with
the protecting disc in oscillograph tubes and
40 rendering the installation simpler and more
powerful. The idea underlying the invention
consists in that penetration of the opposite ves
sel wall by the press stern severed from the re
maining vessel is avoided. For this purpose at
45 least one metal piece, for instance a wire, is
sealed into the press stem, said piece being se
cured to a part outside the discharge vessel, for
instance to a portion of the cap or of the hous
ing, and having such a strength that it does not
50 break under the influence of the efforts ensuing
in the case of an implosion. The metal piece
might also be secured in a suitable manner to
the wall of the bulb.
'I'he metal piece may consist of the same ma
terial as is used for the supply conductors and
(Cl. Z50-27.5)
be constituted, for instance, by a copper sheath
wire. In this case, however, it should be stronger
than the usual sealingein wires and have a
strength of about 800 pounds per square inch
or even more.
However, it may also consist of
another material chosen only in respect of rne
chanical strength and good sealing properties to
glass, without considering its electrical proper
ties, and having such a strength that a wire of
the hitherto usual thickness for instance 400
pounds per square inch, for supply wires satisñes
the required condition.
The invention has been illustrated schematical
ly by the accompanying drawing, which shows one
suitable form of the device.
Fig. 1 is a sectional view of the lower portion
of a cathode ray tube showing the mounting of
the gun structure in the lower end of the tube,
Fig. 2 is a sectional View on the line 2--2 of
Fig. 1, but at right angles to the plane of the paper
as Fig. l is shown, it being noted that in Fig. 2
the electrode structure of Fig. l is omitted and
also the support base member.
Fig. 3 is a view similar to that oi Fig. 2 illus
trating a modiiied form of the invention.
Referring now to the drawing for a further
description of this invention, the invention will
be assumed to be applied to a cathode ray tube,
although this application is only one of a plu
rality of uses. In the form in which the inven
tion has been shown, into the lower end of the
cylindrical member I of the tube there is posi
tioned at the time of evacuation the stem struc
ture 3 which supports the various electrode ele
ments. Through the stem structure 3 the vari
ous conductor elements 5 connecting to all or
several electrodes are passed. At the point where
the conductor members 5 pass through the stem,
the usual press 1 is formed so as to anchor the
support wires for the electrode structure rigidly
within the tube. The upper conductor members
9, II, I3 and I5 which supply the voltages to
the various electrode members of the tube are
suitably welded to the lead in Wires 5 at the 45
points I‘I according to known practice. The con«
ductor members i3 and I5 are arranged to sup
ply heating current to the heater element I9
mounted inside of the cathode member 2l. The
upper end of the cathode member 2| has a suit
able electron emitting material 23 carried in the
upper end thereof. This material may occupy
either substantially the entire area of the cathode
or may be restricted to a minute portion thereof.
The control grid member is formed in the 55
nature of a sleeve 25 and is suitably attached to
the grid control wire ll at the point 21. The
electrons emitted from the cathode emitter 23
pass through the aperture in the grid structure.
ing point 47.
Many other forms of the invention may be
The anode member 29 is also formed from a cy
a-dopted Without departing from the spirit and
lindrical sleeve and has provided therein suit
able apertures 3| through which the emitted
electrons pass. The anode and grid cylinders are
suitably spaced one from the other by means of
insulator spacer members 33 and are rigidly
scope thereof, and it further may be remarked
that it may be advantageous completely to retain
the wires hitherto used for the supply of current,
but to seal~in, moreover, a metal piece accord
mounted in longitudinally spaced relationship by
tection against implosion. One or more supply
conductors sealed into the pinch stem may be
used at the same time as a protection and be
means of a glass bead 35 separating the support
rods or Wires 3l, 34 which are suitably arranged
about the periphery of the two cylinders at con
15 venient locations.
It has been found that in tubes of the highly
evacuated type, frequently, due to implosions, the
complete electrode structure, as well as the stem,
tends to break away from the lower end of the
20 tubular sleeve, forming the outer Wall of the
tube. Thus, there is av tendency to rupture the
entire container and assembly. In or-der to avoid
these difficulties, according to the present inven
tion, provision is made for securely anchoring
25 the stem and electrode structure to a portion of
the tube wall or to the supporting base thereof,
the entire stem press and electrode structure.
This is provided by means of a heavy conductor
member 39 which passes through the press and
30 which has no welds therein.
TheI wire or rod 39
in the form in which the invention is shown, is
arranged to pass outwardly through the wall i
of the tube and is anchored at 4l by any suitable
anchoring, by means of a cap or the like.
mounting socket. As in usual practice, the stem
structure is sealed to the tube wall at the seal»
While the invention, as illustrated, shows the
anchoring rod or Wire 39 securedl to the tube
wall, of course, it is obvious that by extending
the support base member 43 slightly upward fro-m
that position in which it is shown, the anchoring
40 wire or rod 39 may be secured still more rigidly
to the support base itself. As is the custom with
the usual tubes, the support base 43 has pro-A
vided in the lower portion thereof, suitable pins
45 to which the conducting leads 5 are attached
45 and the pins may then be supported in any usual
ing to the invention, this piece affording only pro
formed accordingly. A particular advantageous
form of construction of the invention is obtained 15
if the metal piece which serves as a protection has
no weld point inside the pinch.
Having now described the invention, what is
claimed is:
l.. An electron discharge tube comprising elec 20
trodes, an envelope, a press, an anchoring mem
ber passing through said press transversely to the
major axis thereof, and means fastening said
anchoring member to the walls of said envelope.
2. An electron discharge tube comprising elec~
trodes, an envelope, a supporting base member for
said envelope, a press, an anchoring member pass
ing through said press transversely to the major
axis thereof, and means fastening said anchor
ing member to the aforesaid supporting base.
3. An electron discharge tube comprising elec
trodes, a press, a plurality of anchoring members
passing through said press transversely to the
major axis thereof and mounted at an angle to
each other, and means fastening said anchoring
members to the walls of said envelope.
4. An electron discharge tube comprising elec
trodes, an envelope, a supporting base member
for said envelope, a press anchoring a plurality of
anchoring members -passing through said press 40
transversely to the major axis thereof and
mounted at an angle to each other, and means
fastening said anchoring members to the afore
said supporting base member.
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