US2300591A - Electronic scanning device - Google Patents

Electronic scanning device Download PDF

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Publication number
US2300591A
US2300591A US83669A US8366936A US2300591A US 2300591 A US2300591 A US 2300591A US 83669 A US83669 A US 83669A US 8366936 A US8366936 A US 8366936A US 2300591 A US2300591 A US 2300591A
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US
United States
Prior art keywords
electrode
electrons
plate
potential
current
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
US83669A
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English (en)
Inventor
Osawa Juichi
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2300591A publication Critical patent/US2300591A/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/39—Charge-storage screens
    • H01J29/43—Charge-storage screens using photo-emissive mosaic, e.g. for orthicon, for iconoscope
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H01J31/40—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having grid-like image screen through which the electron ray passes and by which the ray is influenced before striking the output electrode, i.e. having "triode action"

Definitions

  • l j 'rms invention relates t'o'scanmng of the und" e employed in Vtelevision or similar systems and more particularly to electronic beam' scanning.
  • the object of this invention is to providcan improved device for the transmission of' images utilizing anjelectronic beamscanning means.
  • a means is provided in a vessel which is so arranged that it successively sets up a space charge when it is scanned by an electron means, a control electrode having a plurality of minute elements which are photoelectrically sensitiveis arrangedso that it liesvin an operative position with respect to said charge, the control electrode is illuminated by the image light from
  • Fig. 1 is an arrangement of the device of this invention.
  • Figs. 2, 3 and 4 show a number of practical L types o! an opposed electrode and s control elecan image 4current proportional tothe illumination j due tothe scanning of the radiated electron current.
  • a feature of the devicefofk this invention lies in the' fact' thatvthe energy necessary i'or the image control is almost sera-as only a balancing potential yis ,utililed.
  • the scanning efficiency of lthis device is made entirely independent of the" number of picture elements constituting the lm '55 maintained at'a deiinite potential by a suitable -at any given time oteach'part of the image plane Y upon a 'silver foil.
  • The' central conductor it is ⁇ trede.
  • Fig. 1 shows a practical example ci the device of this invention.
  • i is a cathode which generates an electron current
  • .9 is a flux collecting electrode which serves to concentrate and project the electron flux into an opposed electrode t by means oi devising battery i3, t 'is an accelerating anode having a small hole in the-center, t, s are the deilecting plates for pro,
  • ii is a vessel which maintains the electrode in vacuum.
  • the electron current emitted by the cathode l is concentrated and projected into a point upon the 'opposed electrode 8,4 its position being made to change by the ⁇ action of the two sets o! deflecting plates which cause the electrode t to be scanned in the wellknown manner.
  • the element 1V is a grid shaped control electrode which has a surface composedof minute pieces of phoisoelectric ⁇ material' insulated from each other,
  • Ila layer of photoelectric material arranged at ilxed intervals upon il such as, for examplera thin'lm of ca'esium mounted Fig'.-2.
  • i6 is a conductor, I'Il Achange of illumination.
  • NNUU@ means, such as the battery 25.
  • these pieces radiate photoelectrons. and the potential ⁇ of these pieces will be brought up until it becomes almost equal to the maximum point of potential of the electrode 6 lying in the neighborhood thereof.
  • 'I'he potential which is l r nnally reached at each elemental point depends moon the amount of the radiation of the photoelectrons and hence it is proportional to the iliuminationof the light and is higher as the light intensity becomes greater.
  • said pbtential depends upon the radiationl of pnotoelectrons and the influence of the leakage pathat that portion as well as the potential distribution of each electrode, and it is not influenced by the increase or decrease of the number of image points.
  • the current of the l output circuit is to be controlled by the-potentials of each photoelectric piece which is changed from time to 'time -and hence by theillumination of each point of electrode 1.
  • the change of said :current is sensitive to thel 4As the output current is produced continuously in proportion tothe illumination at eachpoint of the limage which had been projected upon -the electrode' 1. this output current may be amplified.
  • the device shown in Fig. 4 is an example of a construction using the plate 8 and the electrode 1 of Fig. i in combination.
  • a core 2l is covered with an insulating substance 22 upon which a photoelectric substance 23 is applied at suitable intervals only at one side surface and a potential is givento the core 21
  • This arrangement permits the suppression-oi the striking electron current and performs the control of the space charge by the photoelectric potential of the photoelectrlc spot 23.
  • the plate 6 may be made of a substance which is especially susceptible to secondary electron radiation, such as for example, a sheet of aluminum which had been properly treated. "With this arrangement a concentrated electron current which has the most suitable speed for secondary electron radiation is transmitted from the cathode l which bombards the plate 6 .to produce a sufilcient space charge due to the secondary electrons, the primary electrons being caused the thickness of said sheet metal being' so small that. as a result of said moving stream of electrons striking one side of said sheet metal, a
  • photoelectrlc means for controlling the flow of electrons between said electrode iirst mentioned and said anode. and an output circuit interconnected between said electrode and said anode.
  • a cathode ray tube having an envelope, a
  • the separating member adapted to emit secondary electrons dividingsaid envelope into two chambers, the ilrst chamber containing means for producing a cathode ray beam and means for causing the cathode ray beam to scan said separating member, the second chamber containing a photosensitive member and an anode and means responsive to projection of light upon said phot-o- ⁇ sensitive member for causing the secondary electrons emitted by the separating member to be modulated by the change on 'the photosensitive member.
  • Cathode beam scanning means for a telef vision camera comprising an evacuated vessel containing a plate-like element having an extended surface capable of emitting electrons, a
  • second plate-like element having a photo-emissaid first surface-and parallel thereto, means for sive surface coating, spaced a small distance from to cause #mission of electrons therefrom and thereby place different' charges 'upon different elemental areas spectivelyjof said second element.' whereby a free electron emittedA from said ilrst sur face into said space will travel toward said second surface under control of said charges, and means for causing electrons to be emitted into said space from said rst surface element by element there-.
  • Cathode beam scanning means acccrdingto.
  • yCathode beam scanning means accordingtoclaim 8 5 Awherein said means for causing electrons to be emitted comprises means I or scanning said rst plate-like element to produce secondaryelec- U tron from said element.
  • Cathode beam scanning means according to claim 3, wherein said second plate-like element comprised an apertured screen, said photo-emissive coating being onthe surface of said'screen y remote from-said extended surface whereby electrons emitted from said first surface travel through said apertures of said screen in accord- -ance with the said charges, wherein said means for causing electrons to be emitted comprises 1 lmeans for scanning said first plate-like element to produce secondary electron from said element.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US83669A 1935-08-03 1936-06-05 Electronic scanning device Expired - Lifetime US2300591A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP468483X 1935-08-03

Publications (1)

Publication Number Publication Date
US2300591A true US2300591A (en) 1942-11-03

Family

ID=12758742

Family Applications (1)

Application Number Title Priority Date Filing Date
US83669A Expired - Lifetime US2300591A (en) 1935-08-03 1936-06-05 Electronic scanning device

Country Status (6)

Country Link
US (1) US2300591A (xx)
BE (2) BE468483A (xx)
DE (1) DE888561C (xx)
FR (1) FR808937A (xx)
GB (1) GB468483A (xx)
NL (1) NL45477C (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615991A (en) * 1948-06-11 1952-10-28 Rca Corp Sound reproducing method and system
US2641723A (en) * 1950-07-29 1953-06-09 Capehart Farnsworth Corp Television image analyzing tube
US2777970A (en) * 1950-10-03 1957-01-15 Paul K Weimer Television camera storage tube
US2798179A (en) * 1952-01-23 1957-07-02 Sheldon Edward Emanuel System for reproducing invisible images
US3243643A (en) * 1962-09-19 1966-03-29 Itt Image storage tube

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB499828A (en) * 1937-07-28 1939-01-30 Baird Television Ltd Improvements in or relating to electron discharge devices for use in television and like systems
DE756553C (de) * 1938-02-16 1958-04-24 Fernseh Gmbh Speichernde Bildfaengerroehre mit Kathodenstrahlabtastung und zwei getrennten, einander dicht parallel gegenueberliegenden Mosaikelektroden
US2213174A (en) * 1938-07-30 1940-08-27 Rca Corp Television transmitting tube
DE1102707B (de) * 1956-11-15 1961-03-23 Hubert Salmen Hohlkoerper, wie Behaelter, Rohrleitungen od. dgl., fuer korrodierend wirkende Stoffe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615991A (en) * 1948-06-11 1952-10-28 Rca Corp Sound reproducing method and system
US2641723A (en) * 1950-07-29 1953-06-09 Capehart Farnsworth Corp Television image analyzing tube
US2777970A (en) * 1950-10-03 1957-01-15 Paul K Weimer Television camera storage tube
US2798179A (en) * 1952-01-23 1957-07-02 Sheldon Edward Emanuel System for reproducing invisible images
US3243643A (en) * 1962-09-19 1966-03-29 Itt Image storage tube

Also Published As

Publication number Publication date
DE888561C (de) 1953-09-03
NL45477C (xx)
FR808937A (fr) 1937-02-18
BE468483A (xx)
BE416614A (xx)
GB468483A (en) 1937-07-06

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