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US1939435A - Photo-electric relay apparatus - Google Patents

Photo-electric relay apparatus Download PDF

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Publication number
US1939435A
US1939435A US608087A US60808732A US1939435A US 1939435 A US1939435 A US 1939435A US 608087 A US608087 A US 608087A US 60808732 A US60808732 A US 60808732A US 1939435 A US1939435 A US 1939435A
Authority
US
United States
Prior art keywords
photo
lead
leads
capacitance
grid
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
US608087A
Other languages
English (en)
Inventor
William D Cockrell
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US608087A priority Critical patent/US1939435A/en
Priority to FR754593D priority patent/FR754593A/fr
Application granted granted Critical
Publication of US1939435A publication Critical patent/US1939435A/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
    • H01J40/00—Photoelectric discharge tubes not involving the ionisation of a gas
    • H01J40/02—Details
    • H01J40/14—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for

Definitions

  • My invention relates to photo-electric relay apparatus including a photo-electric device and an amplifier therefor, and an object of my invention is the provision of improved apparatus of this character which permits of very close adjustment and which allows the use of relatively long leads to the photo-electric device without sacrifice of efficiency. 7
  • the transformer 1 is represented as having a primary 2 which may be connected with any suitable source of alternating current, for example, a 110 volt, 60 cycle commercial lighting circuit.
  • the transformer secondary is represented as being divided into three windings 3, 4, and 5, winding 3 being the grid bias winding to which the photo-electric device is connected, 4 being the anode and load circuit supply winding, and 5 being the cathode heating winding.
  • Winding 4 connects in the usual manner with the cathode and anode of the electron discharge amplifier 6 through resistance '7 across which connects the output or load circuit 8.
  • the photo-electric device 10 such for example as a photo-electric tube having a cathode'll and an anode 12 connects through the leads 14 and 15 with the winding 3, lead 4 being connected directly therewith While lead 5 connects through the capacitor 16 and the grid resistor 17, that end of the winding 3 to which lead 15 connects being grounded as shown at 18.
  • Grid 20 of amplifier 6 connects with the lead 15 at 21 and cathode 22 connects through the midpoint of winding 5 with the adjustable connection 23 of potentiometer 24 which is bridged across winding 3.
  • I have provided a variable resistance connection between the connection of lead 14 and the adjacent end of the potentiometer.
  • connection 25 This is represented by the adjustable connection 25.
  • this capacitor is materially above or below a certain limited range of values the sensitiveness of the apparatus is materially impaired. It is also known that where relatively long leads are employed for the connection of the photo-electric device the capacitance between the leads seriously aiTects the operation of the apparatus.
  • I substantially eliminate the capacitance between the photo-tube leads by providing an interposed member and utilize the capacitance between the grid lead and that member in the circuit of the apparatus.
  • I employ for the grid lead 15 the best commercial insulated wire obtainable while for the other lead 14 ordinary commercial cable may be used.
  • Lead 14 I enclose in a metal covering shown at 2'7 and connect this metal covering with that side of winding 3 which is grounded.
  • metal armor shown at 28 which also is grounded, and in the drawing is shown included in the ground connection 29 of the covering 2'7.
  • a source of alternating current supply a photo-electric device connected to be supplied therefrom and having connecting leads, an electron discharge amplifier for said device having a grid connected with one of said leads, means for substantially eliminating capacitance between said leads and -acapacitor arranged'to supplement the capacitance between said one lead and said means.
  • a source of alternating current supply a photo-electric device, leads connecting the device with said source, an electron discharge amplifier for said device having a grid connected with one of said leads, a conducting member between said leads and connected with one side of said source for substantially eliminating capacitance between the leads, and a capacitor between said one lead and said one side of the source to supplement the capacitance between the conducting member and the grid connected lead.
  • a source of alternating current supply a photo-electric tube having a pair of connecting leads connected with the respective sides of said source, an electron discharge amplifier for said tube having a grid connected with one of said leads, a conducting sheath surrounding the other of said leads and connected with that side of the source to which the grid lead connects, and a capacitor in the connection between said grid connected lead and the source for supplementing the capacitance between that lead and the sheath.

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  • Amplifiers (AREA)
US608087A 1932-04-28 1932-04-28 Photo-electric relay apparatus Expired - Lifetime US1939435A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US608087A US1939435A (en) 1932-04-28 1932-04-28 Photo-electric relay apparatus
FR754593D FR754593A (fr) 1932-04-28 1933-04-21 Perfectionnements aux dispositifs photo-électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US608087A US1939435A (en) 1932-04-28 1932-04-28 Photo-electric relay apparatus

Publications (1)

Publication Number Publication Date
US1939435A true US1939435A (en) 1933-12-12

Family

ID=24434972

Family Applications (1)

Application Number Title Priority Date Filing Date
US608087A Expired - Lifetime US1939435A (en) 1932-04-28 1932-04-28 Photo-electric relay apparatus

Country Status (2)

Country Link
US (1) US1939435A (fr)
FR (1) FR754593A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577973A (en) * 1948-07-22 1951-12-11 Photoswitch Inc Fire warning device
US2717316A (en) * 1952-12-24 1955-09-06 Madey Richard Pulse limiter and shaper
US2965813A (en) * 1954-10-26 1960-12-20 Gen Motors Corp Automatic headlight dimmer system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577973A (en) * 1948-07-22 1951-12-11 Photoswitch Inc Fire warning device
US2717316A (en) * 1952-12-24 1955-09-06 Madey Richard Pulse limiter and shaper
US2965813A (en) * 1954-10-26 1960-12-20 Gen Motors Corp Automatic headlight dimmer system

Also Published As

Publication number Publication date
FR754593A (fr) 1933-11-09

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