US3708713A - Plural beam electron beam scanner utilizing a modulation grid - Google Patents

Plural beam electron beam scanner utilizing a modulation grid Download PDF

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Publication number
US3708713A
US3708713A US00033837A US3708713DA US3708713A US 3708713 A US3708713 A US 3708713A US 00033837 A US00033837 A US 00033837A US 3708713D A US3708713D A US 3708713DA US 3708713 A US3708713 A US 3708713A
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United States
Prior art keywords
target
apertures
beams
cathode
strips
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Expired - Lifetime
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US00033837A
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English (en)
Inventor
F Mccann
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NORTHRUP CORP
NORTHRUP CORP US
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NORTHRUP CORP
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    • 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
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/467—Control electrodes for flat display tubes, e.g. of the type covered by group H01J31/123
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/74—Deflecting by electric fields only

Definitions

  • ABSTRACT A plurality of flat coded dynode members are sandwiched between an electron emitting cathode in the form of a flat plate and a flat target plate.
  • Each dynode member has a plurality of apertures formed therein which are aligned with corresponding apertures on all the other dynodes to form an electron beam channel.
  • the dynodes further each have a pair of separate conductive portions thereon arranged in a predetermined finger pattern, the finest of such finger patterns defining an elemental scanning area of the target plate.
  • Each of such basic resolution elements is formed by means of a channel for each of a plurality of scanning beams.
  • a modulation grid having apertures therein corresponding to the apertures on the dynodes and aligned therewith is placed between the cathode and target and is used to control the energization of the beams.
  • a dynode having one of the finest finger patterns thereon has such finger patterns arranged so that each basic scanning element has a single aperture for each of the separate scanning beams, thereby enabling simultaneous scanning over the entire target area for the separate beams.
  • This invention relates to an electron beam scanner and more particularly to such a scanner formed by a plurality of flat plate elements which is capable of multiple beam operation.
  • an electron beam scanner is described utilizing a plurality of coded dynode members sandwiched between an electron emitting cathode and a target plate wherein the dynodes have a pair of separate conductive portions arranged in a finger pattern.
  • the dynode apertures are aligned with each other to define electron beam channels running between the cathode and the target, each of such channels defining a scanning element of the target.
  • the dynode fingers are excited in response to digital control signals to activate one of the channels at a time thereby addressing the beam to activate the target elements in a predesired manner.
  • the device of this invention involves a modification to the device of the aforementioned patent which enables multibeam operation whereby such beams are excited in response to separate control signals, such as, for example, as utilized for each of the colors in a color television display. It will be appreciated that while the device of the invention is well suited for a color television display, it can also be utilized to equal advantage in other situations where a plurality of display beams are required either operating simultaneously or separately at different times. It is further to be noted that the device of the invention can also be utilized as an image sensor or memory device to sense or memorize a number of separate images or patterns.
  • the modification of this invention involves a relatively simple implementation using a minimum number of components beyond those required for the single beam scanning of U.S. Pat. No. 3,408,532.
  • the device of this invention thus provides a multiple beam scanner capable of providing a color video display which has all of the advantages of the device of U.S. Pat. No. 3,408,532 over cathode ray tube devices. These attributes include the capability of random addressing to any point on the target without a sacrifice of resolution and speed of operation, a relatively flat compact construction, the capability of high linearity and definition and relative immunity to ambient electrostatic and electromagnetic fields.
  • FIG. 1 is a schematic drawing illustrating a preferred embodiment of the device of the invention
  • FIG. 2 is a schematic drawing illustrating the modulation grid of the preferred embodiment
  • FIG. 3 is a schematic drawing illustrating one of the finest finger pattern dynodes of the preferred embodiment.
  • the device of the invention comprises a flat plate cathode and a flat plate target having a plurality of control plates or dynodes sandwiched therebetween for controlling a plurality of electron beams.
  • the control plates need not comprise electron multipliers or dynodes.
  • the dynodes have a plurality of apertures formed therein which are aligned with each other to form electron beam channels between the cathode and the target.
  • a plurality of separate scanning beams which may be simultaneously separately modulated are provided by means of a plurality of separate apertures provided in the dynodes for each basic scanning element.
  • the dynodes have control electrodes arranged in a predetermined finger pattern, the finest finger pattern defining a basic target element defining an elemental scanning area on the target.
  • Control switching means are provided for the dynodes to selectively energize the finger pattern electrodes so as to cause a single target scanning element to be ener-- gized at a time.
  • a modulation grid having apertures therein corresponding to those on the control dynodes has control electrodes formed thereon for controlling the electron beams, each of which is included in every one of the target scanning elements.
  • FIG. 1 a preferred embodiment of the device of the invention is schematically illustrated.
  • Interposed between cathode l6 and target ll are a plurality of dynode members 19-25.
  • a power source 33 is connected between the cathode and the target to accelerate the flow of electrons therebetween.
  • the cathode, target and dynode members are enclosed in a vacuum type environment.
  • the dynodes have a plurality of apertures 47 therein arranged on all of the dynodes in a similar matrix pattern.
  • Dynode 20 has conductive portions 20a and 20b on the opposite broad surfaces thereof, these conductive portions being insulated from each other and being connected to the opposite stages of flipflop 48.
  • dynodes 21-25 have conductive portions 21a, 21b 25a, 25b, respectively, which are connected to corresponding flipflops 49-53.
  • the conductive portions as arranged in the indicated finger patterns are selectively energized to control the electron beam between cathode 16 and target 11 so that a single elemental portion of the target is excited at a time.
  • the finger elements of dynode 25 rather than having two straight line edges has one of these edges in a zigzag configuration such that the fingers alternately include one and two apertures.
  • the finger pattern portions a-25a of the dynodes are shown without stippling to indicate that they are forward biased by their associated flipflops so as to accelerate the electron flow therethrough, while the portions 2017-251) are stippled to indicate that they are back biased.
  • the modulation dynode 19 is totally forward biased, it can be seen that only three beams, i.e., 60a, 60b and 600, will-reach target 11. All of the other beams such as, for example, beam 61, are repelled at one or the other of the dynodes. It should be apparent that by appropriate driving of flipflops 48-53, any portion of the target can be energized by the three beams to provide either regular or random scanning.
  • a three beam implementation is shown as could be utilized for a color television display. But, of course, a different number of beams can be provided utilizing the same basic idea set forth herein.
  • Modulation dynode 19 has a plurality of apertures 47 formed therein which are arranged in a matrix pattern to match the apertures on the other dynodes.
  • Conductive strips 70 are deposited on the opposite broad surfaces of dynode 19, these strips being insulated from each other and arranged diagonally so as to encompass diagonal rows of apertures.
  • modulator 80 Connected to the first, fourth and every succeeding third row of strips 70 thereafter is a modulator 80. Connected to the second, fifth and every succeeding third row of strips 70 thereafter is a modulator 81. Connected to the third, sixth and every succeeding third row of strips thereafter is a modulator 82. Modulators 80-82 are adapted to provide biasing potentials across their associated strips in response to appropriate control signals. These modulators may, for example, operate in response to the three color control signals in a color television receiver. The modulators thus are utilized to modulate the intensity of the beams passing through their associated apertures.
  • dynodes 25 as shown in the illustrative example
  • target 11 in the case of a color television display, target 11 must have its tri-color phosphor dots correlated with the aperture matrix of modulation dynode 19 so that they correspond in position to the associated modulation signals.
  • the three beams need not be displayed simultaneously and can be used to cover separate display images which are either related or non-related.
  • the device of this invention thus provides simple yet highly effective means for enabling multi-beam operation of an electron beam scanner which is particularly suited to a color video display.
  • each of said control plates having apertures therein, corresponding apertures on said control plates being aligned with each other to form electron channels between the cathode and target,
  • switch means for alternatively forward biasing one or the other of the finger patterns of each of said pairs to activate a single separate channel for each of said plurality of beams at a time, so as to energize a single target scanning element
  • modulation grid means interposed between said cathode and target for modulating each of said beams, said modulation grid means having a plurality of apertures formed therein corresponding to said control plate apertures and electrode elements arranged in strips on said modulation grid means, each of said strips encompassing a row of said apertures, succeeding nth rows of said strips being connected together, each set of said interconnected strips being used for modulating a separate one of said beams,
  • control plates having its electrodes arranged in a finger pattern finer than those of the other control plates, the finger pattern of said last mentioned control plate being formed such as to delineate said scanning elements.
  • each of said control plates having apertures therein, corresponding apertures on said control plates being aligned with each other to form electron channels between the cathode and target,
  • control plate members further having a plurality of aperture means therein forming channels for the flow of electrons between said cathode and said target members,
  • switch means for alternatively forward biasing one or control means for selectively applying an electron the other of the finger patterns of each of said pairs accelerating potential to at least one of the finger to activate a single separate channel for each of portions of each of said control plate members and said plurality of beams at a time, so as to energize a 10 a potential for preventing the flow of electrons to single target scanning element, and the others of the finger portions of each of said modulation grid means interposed between said members,
  • said modulation grid means having a plucathode and target members and aligned rality of apertures formed therein corresponding therewith, said modulation grid member having a to said control plate apertures and electrode elements arranged in strips on said modulation grid plurality of apertures formed therein corresponding to and aligned with corresponding apertures in said control late members, a least one 0 said control plate members having finger patterns finer than those of any of the others of said control plate members and arranged in a zig-zag configuration, and having groups of apertures, each of said aperture groups defining an ele mental scanning area,
  • said modulation grid member having electrode ele ments, each of said elements controlling one of the plural beams by controlling the flow of electrons through predetermined ones of said modulation grid apertures, and
  • modulation means for providing separate modulation signals to predetermined ones of said modulation grid member electrodes
  • each elemental target scanning area receiving each of said beams as modulated by said modulation means, each of said strips encompassing a row of said apertures, succeeding third rows of said strips being connected together, each set of said interconnected strips being used for modulating a separate one of said beams,
  • control plates having its electrodes arranged in a finger pattern finer than those of the other control plates, the finger pattern of said last mentioned control plate being formed such as to delineate said target scanning elements.
  • a plural beam electron beam scanner comprising:
  • a power source connected between said target member and said cathode member for providing an electron accelerating potential therebetween
  • control plate members sandwiched between said cathode and target members for controlling the flow of electrons therebetween, said control plate members being aligned opposite each other and said cathode and target members, said control plate members having a plurality of conductive coded finger portions which are insulated

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Measurement Of Radiation (AREA)
US00033837A 1970-05-01 1970-05-01 Plural beam electron beam scanner utilizing a modulation grid Expired - Lifetime US3708713A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3383770A 1970-05-01 1970-05-01

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US3708713A true US3708713A (en) 1973-01-02

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Country Status (7)

Country Link
US (1) US3708713A (enrdf_load_stackoverflow)
JP (1) JPS5141454B1 (enrdf_load_stackoverflow)
CA (1) CA925558A (enrdf_load_stackoverflow)
DE (1) DE2120713A1 (enrdf_load_stackoverflow)
FR (1) FR2091006A5 (enrdf_load_stackoverflow)
GB (1) GB1296501A (enrdf_load_stackoverflow)
NL (1) NL7105780A (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028575A (en) * 1975-11-28 1977-06-07 Rca Corporation Electron multiplier image display device
DE2720235A1 (de) * 1977-05-05 1978-11-16 Siemens Ag Bildaufnahmevorrichtung und verfahren zum betrieb der vorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505559A (en) * 1968-09-25 1970-04-07 Northrop Corp Electron beam line scanner device
US3539719A (en) * 1967-07-24 1970-11-10 Northrop Corp Electron beam scanning device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3539719A (en) * 1967-07-24 1970-11-10 Northrop Corp Electron beam scanning device
US3505559A (en) * 1968-09-25 1970-04-07 Northrop Corp Electron beam line scanner device

Also Published As

Publication number Publication date
FR2091006A5 (enrdf_load_stackoverflow) 1972-01-14
GB1296501A (enrdf_load_stackoverflow) 1972-11-15
JPS5141454B1 (enrdf_load_stackoverflow) 1976-11-10
DE2120713A1 (de) 1971-11-18
NL7105780A (enrdf_load_stackoverflow) 1971-11-03
CA925558A (en) 1973-05-01

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