US2031331A - Photoelectric tube - Google Patents

Photoelectric tube Download PDF

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Publication number
US2031331A
US2031331A US10768A US1076835A US2031331A US 2031331 A US2031331 A US 2031331A US 10768 A US10768 A US 10768A US 1076835 A US1076835 A US 1076835A US 2031331 A US2031331 A US 2031331A
Authority
US
United States
Prior art keywords
cathode
tube
electrode
photo
anode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US10768A
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English (en)
Inventor
Penning Frans Michel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2031331A publication Critical patent/US2031331A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
    • H01J43/02—Tubes in which one or a few electrodes are secondary-electron emitting electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J40/00—Photoelectric discharge tubes not involving the ionisation of a gas
    • H01J40/16—Photoelectric discharge tubes not involving the ionisation of a gas having photo- emissive cathode, e.g. alkaline photoelectric cell

Definitions

  • My invention relates to light sensitive devices and in particular to improvements in photo-electric tubes.
  • the auxiliary electrode consists of alkali-metal at its surface, and is given a positive voltage with respect to the cathode.
  • this voltage is given a smaller value than the anode voltage.
  • the anode cathode voltage and the auxiliary electrodecathode voltage must be supplied to the electrode of the tube. Therefore, the latter must be pro- 25 vided at least with three supply members, for instance, with a base having three contact pins.
  • the invention which relates to a photo-electric tube comprising an anode, a cathode and in addition an auxiliary electrode adapted for the emis- 0 sion of secondary electrons, has for its purpose to avoid the use of two different voltages.
  • the auxiliary electrode is connected for this purpose to the photoelectric electrode through a high resistance which,
  • the tube according to the invention may replace a similar tube not including an auxiliary electrode, without modifying the apparatus in which the tube is used.
  • Figure 1 represents, by way of example, a photo-electric tube embodying my invention
  • Figure 2 is a graph showing the relation of ourrent and light intensity
  • Figure 3 is a modified form of invention showing the resistor within the envelope.
  • the highly exhausted bulb-shaped vessel or en- Velope of the tube is denoted by I, two electrodes 2 and 3 being provided on the inner side of the 5 wall of the tube.
  • the first-mentioned electrode constitutes a light responsive or photo-electrically active cathode which is irradiatedthrough the window 4 provided in the electrode 3, the latter being separated from and therefore insulated from the cathode 2 and constituting the auxiliary electrode where the secondary emission occurs.
  • Both electrodes may be manufactured in the same manner and each consists, for instance, of a silver mirror which is deposited on the wall of the bulb, superficially oxidized, and subsequently exposed to the action of alkali-metal, for instance, caesium.
  • the tube comprises an anode 5 which is shaped as a grid and consists, for instance, of wire mesh or gauze.
  • Anode 5 forms in effect a partition dividing the space of the tube in two parts.
  • thewindow 4 in the auxiliary electrode may be dispensed with.
  • the invention also applies to tubes having a gasfilling.
  • the electrodes are connected to supply wires which are led out through the press 6.
  • the wire I connected to the auxiliary electrode 3 is secured to one end of the resistance 9 which is provided in the reentrant stem 8 and whose other end is connected to the supply or lead-in wire In of the photo-electrically active cathode 2.
  • the tube is equipped with a base I I having two contact pins l2 and I3. These contacts are connected to the wire Ill and to the wire M respectively, the latter supplying anode current.
  • the resistance 9 may, if desired, also be provided within the tube or in or at the base, or again be arranged so as to be separated from the tube.
  • Figure 2 indicates the space current strength as plotted against the flux of light falling on the photo-electric cathode 2. This curve was measured for a cathode-anode voltage of 500 volts and a resistance of 53 megohms between the auxiliary electrode and the cathode.
  • the curve has not exactly the same course with an increasing as with a decreasing flux of light. I he size of the loop formed by the curve depends on the value of the resistance 9. In certaincases this loop will cause trouble so the light flux should be adjusted.- to the curve part beyond the loop.
  • the tube is used 55 contact pins, a light responsive cathode in said tube, a second cathode positioned to receive electrons from the first mentioned cathode, an anode and a resistor in said tube connected at one end to said second cathode and at the other end to the first mentioned cathode and one of said contact pins.
  • a photo-electric tube comprising an envelope supported on a base, and contact pins, a cathode comprising a coating of light responsive material on one wall of said envelope, a second cathode on the opposite wall of said envelope with an opening to admit light to the first mentioned cathode, an anode between said cathodes, and a resistance connected between said cathodes.
  • a light responsive device comprising an envelope with a'press, lead-in wires in said press a photo-electrically active cathode in said envelope, an auxiliary cathode electrode in said envelope insulated from the first mentioned cathode, a window in the wall of said envelope to admit light to the interior thereof, an anode electrode in said envelope connected to one leadin wire, a second lead-in wire connected to said photo-electrically active cathode, and a resistor connecting said second lead-in wire to said auxiliary cathode electrode.

Landscapes

  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Mirrors, Picture Frames, Photograph Stands, And Related Fastening Devices (AREA)
US10768A 1934-03-14 1935-03-13 Photoelectric tube Expired - Lifetime US2031331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE426389X 1934-03-14

Publications (1)

Publication Number Publication Date
US2031331A true US2031331A (en) 1936-02-18

Family

ID=6477182

Family Applications (1)

Application Number Title Priority Date Filing Date
US10768A Expired - Lifetime US2031331A (en) 1934-03-14 1935-03-13 Photoelectric tube

Country Status (4)

Country Link
US (1) US2031331A (en, 2012)
FR (1) FR786412A (en, 2012)
GB (1) GB426389A (en, 2012)
NL (1) NL44137C (en, 2012)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106941070A (zh) * 2016-08-03 2017-07-11 成都青岗科技有限公司 一种球形紫外光电管

Also Published As

Publication number Publication date
NL44137C (en, 2012)
GB426389A (en) 1935-04-02
FR786412A (fr) 1935-09-03

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