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Патент USA US2114488

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April 19, 1938.
P. GöRmcH ~
‘PHOTOELECTRIC TUBE
Filed Aug.r 6, 195e
2,î 14,488
Patented Apr. 19, 1.938
2,114,488
UNITED STATES PATENT OFFICE
2,114,488
PHOT‘OELECTRIC TUBE
Paul Görlich, Dresden, Germany, assignor to
Zeiss Ikon Aktiengesellschaft, Dresden, Ger
many
Application August 6, 1936, SerialV No. 94,590
In Germany August 28, 1935
1 Claim.
(Cl. Z50-27.5)
The invention relates to improvements in photo
electric tube and particularly pertains to a novel
construction of a tube which is adapted to make
full use of the action of the secondary emission of
5
electrons.
’
It is known that the emission of electrons of a
photo electric tube of this type can be substan
tially increased by causing the electrons emitted
by the primary cathode due to incident light to
10 impinge with suflicient speed upon a secondary
cathode, which then emits substantially more
electrons than have been received by the same.
It is now an object of the invention to mount
and secure the cathodes in such a manner within
15 the tube that the insulation value of the primary
cathode with respect to the secondary cathode
is as high as practically possible. With this ob
ject in View, the photo electric tube of the pres
ent invention is provided with a lead-in wire for
20 the primary cathode which does not pass through
the same fusion point of the tube vessel through
which passes the lead-in wire for the secondary
cathode. In fact, it is a very important object
of the invention to place the two fusion points
25 through which the respective cathode lead-in
Wires enter the tube as far apart as possible, so
that the insulation-resistance between the- two
lead-in wires is su?ûciently high to prevent any
disturbances during the operation of the tube.
30
In the drawing the Figs. 1 to 6 illustrate di
agrammatically various embodiments of the in
vention.
Fig. 1 shows a tube in which the lead-in wire
for the primary cathode PK passes at a through
35 the side wall of the Vessel V, while the lead-in
wire for the secondary cathode SK enters the
top portion of the vessel V at bl. The lead-in
wire for the anode A passes at c through the bot
tom portion of the vessel.
40
In Fig. 2 the lead-in wire for the primary cath
ode PK enters the top portion of the Vessel V
at d, while the lead-in wire for the secondary
cathode SK passes at e through the side wall of
the vessel. The lead-in wire for the anode A, as
in Fig. 1, passes through the bottom ofthe vessel
at f.
In the tube illustrated by Fig. 3 the lead-in
wire for the primary cathode PK and the one for
the anode A enter the vessel V both from the
bottom as indicated by g and h respectively, While
the lead-in wire for the secondary cathode SK 10
passes at i through the top wall of the vessel V.
In Fig. 4, the lead-in wire for the primary
cathode PK enters the side Wall of the vessel V at
1c, the lead-in wire for the secondary cathode SK
enters the vessel through the bottom wall at Z, 15
while the anode A is connected to a lead-in Wire
passing at m through the top wall of the vessel.
Fig. 5 shows a photo electric tube in which
the lead-in wire for the primary cathode PK
enters the vessel V through its bottom at n, While 20
the secondary cathode SK is connected to a lead
in wire passing through the side wall at 0‘. The
anode A is connected to a lead-in wire entering
the vessel V from the top as shown at p.
According to Fig. 6 the lead-in wire for the 25
primary cathode PK passes at r through the top
wall of the vessel V, and the lead-in wires for the
secondary cathode SK and for the anode A re
spectively are both entering the vessel V through
the bottom wall thereof as indicated at s and t 30
respectively.
I claim as my invention:
A photo electric tube comprising a vessel, a
primary cathode, a secondary cathode and an
anode within said vessel, a lead-in wire entering 35
said vessel from above and connected to said
secondary cathode, and two lead-in wires enter
ing said vessel from below and connected to said
primary cathode and said anode respectively.
..
PAUL GORLICH.
40
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