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Патент USA US2122860

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I July 5, -1938. '
`
2,122,860
i5. GöRLlcl-l
- LIGHT SENSITIVE ÍTUBE .
Filed Aug. 6, 1936
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BY
¿Daal @ók/z'cá~ ~
ATTORNEY.
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`Patented July 5, 1938
' 2,122,860
UNITED STATES PATENT GFFICE
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2,122,860
LIGHT SENSITIVE ‘TUBE
` Paul Görlich, Dresden, Germany, assignor to
Zeiss Ikon Aktiengesellschaft,_Dresden, Ger
many
Application August s, 1936, serial No. 94,589
InG ermany August 8, 1935
2 claims. (ci. 25o-27.5)
The invention relates to improvements ln light logues, whereby the oxygen is adsorbed on the
sensitive tubes‘and particularly relates to a novel layer. Subsequent to this operation caeslum or
rubidium is precipitated by evaporation upon the
photoelectric cathode for photoelectric tubes.
An object of the invention is to produce a antimony or bismuth layer respectively prepared 5
5 photoelectric- cathode which is extremely sensi
in the described manner. ' By a heat- treatment
of the layers, the caesium or rubidium respec
tive in the visible _range of the spectrum. Another object of the invention is the produc-v tively ls caused to enter into> the antimony or
tion of a photoelectric layer which may be made bismuth- layer respectively and forms an alloy.
sufficiently thin to remain pervious to light. A_ The composite coating produced in this manner
is extremely sensitive to light and possesses a .
10 photoelectric tube equipped with a thin light sen
sitive layer of this type is particularly suitable for sensitiveness covering-the entire visible range of
“
,
television purposes, since this tube permits the the spectrum.
If the light sensitive layer is not required to
construction of a television apparatus which is
15 adapted for taking television images at day light. be pervious to light, then the above elements may
be precipitated to greater thickness. However,
rThe accompanying drawing illustrates dia
grammatically a photoelectric tube provided with care must be taken always that the alloy will be
a p_hotoelectrìc cathode in accordance with the produced. The employment'of rubidium in place
of caeslum will produce a tube whose highest light
present invention.
20
. The> envelope I of the tube contains an anode
2 and a photoelectric cathode 3. The latter may
consist of a layer of antimony or bismuth and a
sensitiveness is displaced more toward the ultra- 20
violet portion of lthe spectrum.
What I claim as my invention is:
’
1. A photoelectrlc cathode comprising a bis
layer of rubidium or caeslum alloyed together.
In the present instance the photoelectrlc cathode - muth layer and a caeslum layer alloyed together.
2. A photoelectric cathode consisting of a layer
25 is` mounted on the lnnergwall of the envelope I. of an lelement of a group which comprises bis 25
The method for producing the-light sensitive muth and antimony, and a layer if an element
layer of the invention is as-_follo'wsz A thin layer of a group which comprises rubidium and caesl
of antimony o_r bismuth is precipitated by evap
oration upon a suitable carrier.
layer then um, said layers being 'alloyed together.
'
PAUL «,iöRLICH.
preferably is treated with oxygen or its homo
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