US3678330A - Multi-beam electron beam scanner utilizing a modulation plate for modulating each of the beams independently - Google Patents

Multi-beam electron beam scanner utilizing a modulation plate for modulating each of the beams independently Download PDF

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Publication number
US3678330A
US3678330A US33838A US3678330DA US3678330A US 3678330 A US3678330 A US 3678330A US 33838 A US33838 A US 33838A US 3678330D A US3678330D A US 3678330DA US 3678330 A US3678330 A US 3678330A
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United States
Prior art keywords
beams
target
apertures
cathode
plate
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Expired - Lifetime
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US33838A
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English (en)
Inventor
Bobby L Landrum
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Northrop Grumman Corp
Northrop Grumman Systems Corp
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Northrop Grumman Corp
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/20—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using multi-beam tubes
    • 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

Definitions

  • a plurality of flat coded dynode members are sandwiched between an electron emitting cathode in the form of 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 of the other dynodes, each such set of aligned apertures forming an electron beam channel.
  • the dynodes also each have a pair of separate conductive finger patterns, the finest of such finger patterns defining an elemental scanning area of the target plate.
  • the finger patterns and number of dynodes utilized are chosen so as to provide a predetermined number of simultaneous scanning beams.
  • a modulation grid having apertures therein corresponding to the apertures on the dynode and having separate portions covering the areas encompassed by each of the scanning beams is placed between the cathode and target to control the energization of the beams.
  • This invention relates to an electron beam scanner and more particularly to such a scanner utilizing flat dynode control elements and a modulation dynode element, which is capable of multi-beam operation.
  • this type of multiple beam operation can provide a plurality of separate displays simultaneously. In this manner, the information handling capability of the scanner can be augmented. Further, the plural beams can be utilized to simultaneously provide different portions of the same display. Thus, for example in the case of a television picture, various sections of this picture can be simultaneously registered on the target, these different portions being synthesized by the eye to form the total display.
  • This type of simultaneous beam scanning has an advantage in that each simultaneously scanning beam can scan at a lower rate for any given total scanning period, thus enabling greater dwell time for the beam at each target resolution element thus afiording increased brightness of the display.
  • the device of this invention involves a modification to the device of the aforementioned patent to enable beam operation wherein each of the beams may be excited in response to separate modulation control signals. It is to be noted that the device of the invention can be utilized as not only for display purposes but also can be implemented as an image sense or a memory device to sense or memorize a number of separate images or patterns.
  • the device of this invention is closely similar to the single beam scanning device described in the aforementioned US. Pat. No. 3,408,532 involving a relatively simple modification to the structure described in that patent without any major changes in the components or assembly thereof.
  • This patent is therefore incorporated herein by reference and only that information needed by one skilled in the art to modify the structure described within that patent will be described herein.
  • FIGURE schematically illustrates one embodiment of the device of the invention.
  • 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 each have a plurality of apertures formed therein such apertures being aligned with each other to form electron beam channels between the cathode and the target.
  • the dynodes have control electrodes therein arranged in a pre-determined finger pattern, the finest finger pattern establishing a basic scanning element which defines an elemental scanning area on the target. The finger patterns are selected and arranged so as to simultaneously provide a plurality of scanning beans.
  • Control switching means are provided for the dynodes to selectively energize the finger pattern electrodes so as to cause each of the beans to activate a single target element at a time.
  • a modulation pid having apertures therein corresponding to those on the control dynodes has separate control electrodes thereon, each of such electrodes being utilized for controlling one of the beans.
  • This particular embodiment has four separate beams each of which may be caused to scan a quadrant of the target. It is to be noted that such for beam scanning in only illustrative of one of many multiple beam types of operation that can be achieved. Other numbers and arrangements of beams can be obtained by utilizing other various combinations of finger pattern electrodes and numbers of dynodes.
  • a power source 33 is connected between the cathode l6 and target 1 l to accelerate the flow of electrons therebetween.
  • Interposed between the cathode and target are a plurality of dynode members 22-26.
  • the cathode, target and dynode members are enclosed in a vacuum tight environment.
  • the dynodes have a plurality of apertures 47 therein arranged on all of the dynodes in a similar matrix pattern. The dynodes are aligned with each other so that corresponding apertures form electron beam channels between the cathode and the target.
  • Dynode 22 has conductive portions 22a and 22b on the opposite broad surfaces thereof, these conductor portions being insulated from each other and being connected to the opposite stages of flip-flop 50, similarly dynodes 23-25 have conductive portions 23a, 23b-25a, 25b, respectively, which are connected to corresponding flip-flops 51-53.
  • Modulation dynode 26 which forms a control grid has four separate electrode seg' ments 26a26d on the opposite broad surfaces thereof. Each of segments 26a26d receives a separate modulation signal from an associated one of modulator units 60-63.
  • the finger pattern electrodes 22a, 22b-25a, 25b are selectively energized by their associated flip-flops 50-53 to control the electron beams between cathode l6 and target 11.
  • the finger pattern electrodes 22a, 22b-25a, 25b are selectively energized by their associated flip-flops 50-53 to control the electron beams between cathode l6 and target 11.
  • the device of the aforementioned patent however only a single elemental portion of the target is excited at the time, as compared to the present device wherein four of such elemental portions are simultaneously excited.
  • Such plural beam operation to provide for simultaneous beams is achieved in the illustrative embodiment shown in the figure, by eliminating both two finger control electrode dynodes of the device of the aforementioned patent and by adding modulation dynode 26 having separate electrode portions 26a-26d for controlling each of the beams.
  • the finger pattern electrodes 22a25a are shown without stippling to indicate they are forward biased by their associated flip-flops so as to cause electron flow therethrough while electrodes 23b-25b are stippled to indicate that they are back biased to retard electron flow.
  • each of the quadrants 26a-20d of modulation dynode 26 are forward biased it can be seen that four beans 60a-60d will reach target 11. Electron flow through all other channels such as, for example, that represented by beam 61 is repelled at one or the other of the dynodes. It should be readily apparent that by appropriate driving of control flipfiops 50-53, any elemental portion of each of the target segments can be selectively energized by its associated beam to provide either regular or random scanning.
  • Each of modulators 6063 is used to provide intensity modulation signals to an associated one of control electrode portions 26a26d thereby producing four displays on the target, each in accordance with a separate modulation signal. As already noted, these four displays may be synthesized to form a single display or may each be a separate display in itself.
  • the 8 X 8 channel device shown in the figure is only illustrative and a practical device would normally include many more channels. It is further to be noted that in certain instances it may be desirable to provide electron multiplication dynodes which are always forward biased, particularly in situations where there are only a small number of control dynodes to produce a relatively large number of beams.
  • the device of this invention thus provides simple highly effective means for enabling multi-beam operation of an electron beam scanner with separate modulation beams for each of such beams.
  • 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
  • modulation means interposed between said cathode and said target for modulating each of said beams independently.
  • said modulation means comprises a plate having a plurality of apertures formed therein corresponding to said control plate apertures and electrode elements on said plate, each of said electrode elements being used for controlling one of said beams.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Measurement Of Radiation (AREA)
  • Electron Beam Exposure (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US33838A 1970-05-01 1970-05-01 Multi-beam electron beam scanner utilizing a modulation plate for modulating each of the beams independently Expired - Lifetime US3678330A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3383870A 1970-05-01 1970-05-01

Publications (1)

Publication Number Publication Date
US3678330A true US3678330A (en) 1972-07-18

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US33838A Expired - Lifetime US3678330A (en) 1970-05-01 1970-05-01 Multi-beam electron beam scanner utilizing a modulation plate for modulating each of the beams independently

Country Status (7)

Country Link
US (1) US3678330A (enrdf_load_stackoverflow)
JP (1) JPS5118133B1 (enrdf_load_stackoverflow)
CA (1) CA920200A (enrdf_load_stackoverflow)
DE (1) DE2120881A1 (enrdf_load_stackoverflow)
FR (1) FR2091007A5 (enrdf_load_stackoverflow)
GB (1) GB1296502A (enrdf_load_stackoverflow)
NL (1) NL7105831A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158210A (en) * 1977-09-13 1979-06-12 Matsushita Electric Industrial Co., Ltd. Picture image display device
DE3339696A1 (de) * 1983-11-03 1984-04-12 Klaus Dipl.-Ing.(FH) 4150 Krefeld Sundergeld Bildwiedergabevorrichtung mit flachem bildschirm
US4871949A (en) * 1987-01-23 1989-10-03 Albert Abramson Cathode ray tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051468A (en) * 1976-07-28 1977-09-27 Rca Corporation Apparatus and method for modulating a flat panel display device
GB2174535B (en) * 1985-04-29 1989-07-05 Philips Electronic Associated Display tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1023887A (en) * 1963-10-02 1966-03-30 M O Valve Co Ltd Improvements in or relating to cathode ray tubes
US3382392A (en) * 1967-01-16 1968-05-07 Stromberg Carlson Corp Cathode ray tube simultaneously generating a plurality of shaped electron beams
US3408532A (en) * 1965-12-06 1968-10-29 Northrop Corp Electron beam scanning device
US3539719A (en) * 1967-07-24 1970-11-10 Northrop Corp Electron beam scanning device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1023887A (en) * 1963-10-02 1966-03-30 M O Valve Co Ltd Improvements in or relating to cathode ray tubes
US3408532A (en) * 1965-12-06 1968-10-29 Northrop Corp Electron beam scanning device
US3382392A (en) * 1967-01-16 1968-05-07 Stromberg Carlson Corp Cathode ray tube simultaneously generating a plurality of shaped electron beams
US3539719A (en) * 1967-07-24 1970-11-10 Northrop Corp Electron beam scanning device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158210A (en) * 1977-09-13 1979-06-12 Matsushita Electric Industrial Co., Ltd. Picture image display device
DE3339696A1 (de) * 1983-11-03 1984-04-12 Klaus Dipl.-Ing.(FH) 4150 Krefeld Sundergeld Bildwiedergabevorrichtung mit flachem bildschirm
US4871949A (en) * 1987-01-23 1989-10-03 Albert Abramson Cathode ray tube

Also Published As

Publication number Publication date
FR2091007A5 (enrdf_load_stackoverflow) 1972-01-14
GB1296502A (enrdf_load_stackoverflow) 1972-11-15
NL7105831A (enrdf_load_stackoverflow) 1971-11-03
JPS5118133B1 (enrdf_load_stackoverflow) 1976-06-08
DE2120881A1 (de) 1971-11-18
CA920200A (en) 1973-01-30

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AS Assignment

Owner name: NORTHROP CORPORATION, A DEL. CORP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NORTHROP CORPORATION, A CA. CORP.;REEL/FRAME:004634/0284

Effective date: 19860516