US3651361A - Cathode ray tube character mask with plurality of perforations for each character - Google Patents

Cathode ray tube character mask with plurality of perforations for each character Download PDF

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Publication number
US3651361A
US3651361A US864797A US3651361DA US3651361A US 3651361 A US3651361 A US 3651361A US 864797 A US864797 A US 864797A US 3651361D A US3651361D A US 3651361DA US 3651361 A US3651361 A US 3651361A
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Prior art keywords
character
perforations
electrode
axis
ray tube
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US864797A
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Shigeaki Tanaka
Yoshimasa Tamanaka
Tadashi Nakamura
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Noritake Itron Corp
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Ise Electronics 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
    • H01J31/16—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen with mask carrying a number of selectively displayable signs, e.g. charactron, numeroscope
    • 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
    • H01J31/128—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digitally controlled display tubes

Definitions

  • FIG. 1 A first figure.
  • cathode ray tubes for displaying characters may be mentioned the Typotron and Charactron.
  • these prior cathode ray tubes utilize deflecting electrodes for selecting characters strict accuracies are required to fabricate their electron guns, thus rendering difficult to manufacture them.
  • a cathode ray tube for displaying characters and the like comprising a' cathode electrode for emitting electrons, an electron lens means, a deflection means and a character forming means disposed between the cathode electrode and the electron lens means.
  • the character forming means comprises a character substrate provided with a plurality of character pattern per forations which are arranged in the form of characters, a X- axis selector electrode including a plurality of X-axis electrode elements each having a plurality of perforations for passing electrons and a Y-axis selector electrode including a plurality of Y-axis electrode elements each having a plurality of perforations for passing electrons, said X- and Y-axis electrode elements being arranged in a matrix so that a desired character pattern region is determined by selecting the matrix coordinates of the electrode elements to shape the electron beam passing through the region by the character pattern perforations of the character substrate.
  • FIG. 1 diagrammatically shows a longitudinal section of a cathode ray tube embodying this invention
  • FIG. 2 is a plan view of a character substrate utilized in this invention.
  • FIG. 3 is a diagram to show the relationship between a character and selector electrodes for selecting the character
  • FIG. 4 is an enlarged plan view of a X-axis selector electrode and FIG. 5 is an enlarged plan view of a Y-axis selector electrode;
  • the cathode ray tube embodying this invention and diagrammatically shown in FIG. 1 comprisesan evacuated envelope 1 having a fluorescent screen 4 at one end and a neck portion surrounded by a focusing coil 3 and a deflection coil 4 constituting an electron lens system. Inside the neck portion are disposed a cathode electrode 5 of an electron gun, a grid electrode 6 in the form of a mesh electrode to uniformly dispersing the electrons emitted from the cathode electrode 6 to have a uniform density, a character forming means embodying this invention and an accelarating electrode 8.
  • the electron current passed through the grid electrode 6 is converted into an electron beam acting to form the desired character.
  • the electron beam is caused to focus on the desired position of the fluorescent screen by the action of the deflection coil 4 to display the desired character.
  • the character forming means constituting an essential element of this invention comprises a character substrate 9 and two selector electrodes arranged in a matrix.
  • the substrate 9 is a thin flat sheet of insulator such as mica or ceramic.
  • the substrate is provided with a number of perforations (character pattern perforations) arranged in the form of numerals, alphabets or symbols.
  • Selector electrodes are dis osed to constitute a matrix and include a X-axis selector electrode 10 shown in FIG. 4 and a Y-axis selector electrode 11 shown in FIG. 5.
  • the X-axis selector electrode 10 is disposed on the front side of the character substrate'9 in close proximity thereto whereas the Y-axis selector electrode 11 on the rear side of the character substrate in close proximity thereto.
  • Each of these electrodes is comprised by a plurality of closely adjacent parallel electrode elements or strips, each provided with a number of perforations for passing electrons.
  • FIG. 4 shows an enlarged plan view of the X-axis selector electrode 10 comprising a plurality of parallel electrode elements 12 which are disposed in the same plane. Each of the electrode elements 12 is formed with numerous perforations 13 for passing electrons.
  • FIG. 5 shows an enlarged plan view of the Y-axis selector .electrode.llrsimilarlycomprising a plurality ofparallel electrode elements 14 disposed in the same plane. Each of the electrode elements is formed with numerous perforations 15 for passing electrons. As diagrammatically shown in FIG. 3, electrode elements 12 and 14 are disposed with respect to the character substrate 9 to form a matrix. Thus, by selecting some of the electrode elements of the X- and Y-axis selector electrodes it is possible to select the desired character pattern region on the character substrate 9. For example, FIG. 3 shows the selection of the region of a numeral 1 at the cross point between a row X1 and Y1 shown in FIG. 2 by electrode trons will not be attracted by the negative electric field.
  • the substrate 9 is provided with perforations that shape the electron beam, or character pattern perforations after passing through substrate 9 the electron beam pattern will be given the given configuration of the selected character.
  • the electron beam After passing through perforations 15 of electrode elements 14 of the Y-axis selector electrode 11 the electron beam will be accelerated by the accelerating electrode 8 shown in FIG. 1 toward the fluorescent screen 2.
  • the cross section of the electron beam impinging upon the fluorescent screen corresponds to the configuration of the character pattern perforations of the character substrate 9. so that the selected character will be displayed on the screen 2.
  • the position and magnitude ofthe displayed character are determined by the focusing coil 3 and the deflection coil 4.
  • X-axis selector electrode and the Y-axis selector electrode are positioned on the opposite sides of the character substrate it should be understood that this invention is not limited to this particular arrangement but X- and Y-axis selector electrodes may be fabricated, i ctese roximity to form a matrix and the eharacter substrate may be positioned on the front or rear side of the assembly. it will also be clear that it is desirable to align as far as possible numerous perforations l3 and of electrode elements 12 and 14 when they are assembled to form the matrix.
  • the characterpattern.perforationsprovided for-thecharactersubstrate and the pattern region of the character pattern perforations are selected by the selection of the matrix coordinates comprised by the X- and Y-axis selector electrodes thereby displaying the desired character. Accordingly the construction of the novel display cathode ray tube is more simple than con ventional display devices.
  • a cathode ray tube for dis laying characters, numerals and patterns comprising a cathode electrode for emitting electrons, a grid mesh electrode for uniformly dispersing electrons emitted from said cathode, an electron lens means, a deflection means, and a character forming means disposed between.
  • said character forming means being characterized by comprising a character substrate provided with a plurality of character pattern perforations which are arranged in the form of characters, and providing for each of said character pattern perforations an X-axis selector electrode including a plurality of X- axis electrode elements each having numerous perforations for passing electrons and a Y-axis selector electrode including a plurality of Y-axis electrode elements each having numerous perforations for passing electrons, said X- and Y-axis electrode elements being arranged in a matrix so that a desired character pattern region constituting numerous elemental beams is determined by selecting the matrix coordinates of said electrode elements to shape the electron beam passing through said region by the corresponding said character pattern perforation of said character forming substrate.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

A cathode ray tube for displaying characters and the like is provided with a character forming means comprising a character substrate provided with a plurality of character pattern perforations arranged in the form of characters, a plurality of parallel X-axis electrode elements each having a plurality of perforations and a plurality of parallel Y-axis electrode elements each having a plurality of perforations and these X- and Y-axis electrode elements are arranged in a matrix so that a desired character pattern region is determined by selecting the matrix coordinates of the electrode elements to shape the electron beam passing through the region by the character perforations of the character substrate.

Description

CATHODE RAY TUBE CHARACTER rivers-"- Q1 3,55% si 51 Mar. 21, 1972 2,862,144 ll/i968 McNaney ..3 l3/86 KM X 2.965.801 l2/l960 Archer et al "313/86 X 3,i98.976 8/1965 Starr ..3l3/86 KM Primary Examiner- Robert Segal Au0rneyChittick, Pfund. Birch, Samuels & Gauthier [57] ABSTRACT A cathode ray tube for displaying characters and the like is provided with a character forming means comprising a character substrate provided with a plurality of character pattern perforations arranged in the form of characters, a plurality of parallel X-axis electrode elements each having a plurality of perforations and a plurality of parallel Y-axis electrode elements each having a plurality of perforations and these X- and Y-axis electrode elements are arranged in a matrix so that a desired character pattern region is determined by selecting the matrixscoordinates of ,.the. electrode elements to .=shape the electron beam passing through the region by the character perforations of the character substrate.
5 Ciairns, 5 Drawing Figures b X i i FIG. 3
FIG.
YIYZYE o I I I ll PATENTEDmm m2 x| x2 A B0 V-INVENTOR s ATTORNEY I I I l 1 s l eoccccoo 5 i ii iii TADASHI NAKAMURA YOSHIMASA YAMANAKA SHIGEAKI TANAKA W- mu? CATHODE RAY TUBE CHARACTER MASK WITH PLURALITY OF PERFORATIONS FOR EACH CHARACTER BACKGROUND OF THE INVENTION This invention relates to a novel cathode ray tube for displaying characters, numerals patterns and symbols (hereinafter merely termed as characters).
Among heretobefore proposed cathode ray tubes for displaying characters may be mentioned the Typotron and Charactron. However, as these prior cathode ray tubes utilize deflecting electrodes for selecting characters strict accuracies are required to fabricate their electron guns, thus rendering difficult to manufacture them.
SUMMARY OF THE INVENTION It is an object of this invention to provide a novel Cath d ray tube wherein it is possible to readily display the desired character with the desired size on the desired position of the fluorescent screen.
According to this invention there is provided a cathode ray tube for displaying characters and the like comprising a' cathode electrode for emitting electrons, an electron lens means, a deflection means and a character forming means disposed between the cathode electrode and the electron lens means. The character forming means comprises a character substrate provided with a plurality of character pattern per forations which are arranged in the form of characters, a X- axis selector electrode including a plurality of X-axis electrode elements each having a plurality of perforations for passing electrons and a Y-axis selector electrode including a plurality of Y-axis electrode elements each having a plurality of perforations for passing electrons, said X- and Y-axis electrode elements being arranged in a matrix so that a desired character pattern region is determined by selecting the matrix coordinates of the electrode elements to shape the electron beam passing through the region by the character pattern perforations of the character substrate.
BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawing:
FIG. 1 diagrammatically shows a longitudinal section of a cathode ray tube embodying this invention;
FIG. 2 is a plan view ofa character substrate utilized in this invention;
FIG. 3 is a diagram to show the relationship between a character and selector electrodes for selecting the character;
FIG. 4 is an enlarged plan view of a X-axis selector electrode and FIG. 5 is an enlarged plan view of a Y-axis selector electrode;
DESCRIPTION OF THE PREFERRED EMBODIMENT The cathode ray tube embodying this invention and diagrammatically shown in FIG. 1 comprisesan evacuated envelope 1 having a fluorescent screen 4 at one end and a neck portion surrounded by a focusing coil 3 and a deflection coil 4 constituting an electron lens system. Inside the neck portion are disposed a cathode electrode 5 of an electron gun, a grid electrode 6 in the form of a mesh electrode to uniformly dispersing the electrons emitted from the cathode electrode 6 to have a uniform density, a character forming means embodying this invention and an accelarating electrode 8.
In accordance with this invention, when passing through the character forming means 7 the electron current passed through the grid electrode 6 is converted into an electron beam acting to form the desired character. After entering into the electron lens system, the electron beam is caused to focus on the desired position of the fluorescent screen by the action of the deflection coil 4 to display the desired character.
The character forming means constituting an essential element of this invention comprises a character substrate 9 and two selector electrodes arranged in a matrix. As shown in FIG. 2. the substrate 9 is a thin flat sheet of insulator such as mica or ceramic. The substrate is provided with a number of perforations (character pattern perforations) arranged in the form of numerals, alphabets or symbols. Selector electrodes are dis osed to constitute a matrix and include a X-axis selector electrode 10 shown in FIG. 4 and a Y-axis selector electrode 11 shown in FIG. 5. In this example, the X-axis selector electrode 10 is disposed on the front side of the character substrate'9 in close proximity thereto whereas the Y-axis selector electrode 11 on the rear side of the character substrate in close proximity thereto. Each of these electrodes is comprised by a plurality of closely adjacent parallel electrode elements or strips, each provided with a number of perforations for passing electrons. I
'FIG. 4 shows an enlarged plan view of the X-axis selector electrode 10 comprising a plurality of parallel electrode elements 12 which are disposed in the same plane. Each of the electrode elements 12 is formed with numerous perforations 13 for passing electrons.
FIG. 5 shows an enlarged plan view of the Y-axis selector .electrode.llrsimilarlycomprising a plurality ofparallel electrode elements 14 disposed in the same plane. Each of the electrode elements is formed with numerous perforations 15 for passing electrons. As diagrammatically shown in FIG. 3, electrode elements 12 and 14 are disposed with respect to the character substrate 9 to form a matrix. Thus, by selecting some of the electrode elements of the X- and Y-axis selector electrodes it is possible to select the desired character pattern region on the character substrate 9. For example, FIG. 3 shows the selection of the region of a numeral 1 at the cross point between a row X1 and Y1 shown in FIG. 2 by electrode trons will not be attracted by the negative electric field. On the other hand, when both X- and Y-axis selector electrodes are at a positive potential incoming electrons will be attracted by these electrodes. As a result, by imparting a positive potential to some electrode elements of the X- and Y-axis selector electrodes, electrons will be attracted by the region comprised by these selected electrode elements. This invention is based on this principle as discussed in detail hereinbelow.
While electrons of uniform density pass through the grid electrode 6 in the form of a mesh when a positive potential is impressed upon electrode elements of X- and Y-axis selector electrodes that determine a character pattern region of a character-to be displayed of the character substrate 9, the character pattern region will create a high positive electric field than remaining regions. The resulted field attracts electrons at high speed toward said character pattern region. At this time, arrived electrons will collide against portions of the electrode elements 12 of the X-axis electrode 10 which are included in the pattern region and electrons directed to the perforations 13 of electrode elements 12 will reach the character substrate with a spread corresponding to the character pattern region. However, since the substrate 9 is provided with perforations that shape the electron beam, or character pattern perforations after passing through substrate 9 the electron beam pattern will be given the given configuration of the selected character. After passing through perforations 15 of electrode elements 14 of the Y-axis selector electrode 11 the electron beam will be accelerated by the accelerating electrode 8 shown in FIG. 1 toward the fluorescent screen 2. The cross section of the electron beam impinging upon the fluorescent screen corresponds to the configuration of the character pattern perforations of the character substrate 9. so that the selected character will be displayed on the screen 2. The position and magnitude ofthe displayed character are determined by the focusing coil 3 and the deflection coil 4. By successively exciting the character selector electrodes it is possible to simultaneously display a number of characters on the screen 2 by utilizing its residual pro erty.
While in the above described embodiment the X-axis selector electrode and the Y-axis selector electrode are positioned on the opposite sides of the character substrate it should be understood that this invention is not limited to this particular arrangement but X- and Y-axis selector electrodes may be fabricated, i ctese roximity to form a matrix and the eharacter substrate may be positioned on the front or rear side of the assembly. it will also be clear that it is desirable to align as far as possible numerous perforations l3 and of electrode elements 12 and 14 when they are assembled to form the matrix.
As above described. in accordance with this invention the characterpattern.perforationsprovided for-thecharactersubstrate and the pattern region of the character pattern perforations are selected by the selection of the matrix coordinates comprised by the X- and Y-axis selector electrodes thereby displaying the desired character. Accordingly the construction of the novel display cathode ray tube is more simple than con ventional display devices.
What is claimed is:
l. A cathode ray tube for dis laying characters, numerals and patterns comprising a cathode electrode for emitting electrons, a grid mesh electrode for uniformly dispersing electrons emitted from said cathode, an electron lens means, a deflection means, and a character forming means disposed between.
said cathode electrode and said electron lens means, said character forming means being characterized by comprising a character substrate provided with a plurality of character pattern perforations which are arranged in the form of characters, and providing for each of said character pattern perforations an X-axis selector electrode including a plurality of X- axis electrode elements each having numerous perforations for passing electrons and a Y-axis selector electrode including a plurality of Y-axis electrode elements each having numerous perforations for passing electrons, said X- and Y-axis electrode elements being arranged in a matrix so that a desired character pattern region constituting numerous elemental beams is determined by selecting the matrix coordinates of said electrode elements to shape the electron beam passing through said region by the corresponding said character pattern perforation of said character forming substrate.
2. The cathode ray tube according to claim 1 wherein said character substrate is a thin sheet of insulator.
3. The cathode ray tubeaccording to ,claim 1 whereinsaid X- and Y-axis selector electrodes are disposed on the opposite sides of said character substrate but closely spaced therefrom.
4. The cathode ray tube according to claim I wherein said X- and Y-axis electrodes are assembled in close proximity to form a matrix and the assembly is positioned one side of said character substrate.
5. The cathode ray tube according to claim 1 wherein the character pattern perforations of said character substrate and perforations of said X- and Y-axis electrode elements align with each other when they are assembled.
PO-1O5OI UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3I65l'36-l Dated March 1972 Shigeaki Tanaka; Yoshimasa Tamanaka; InV nt Tadashi Nakamura It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below Column 2, line 33, before"Yl." insert a column Signed and sealed this 1st day of August 1972.
(SEAL) Attest:
EDWARD M. FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents

Claims (5)

1. A cathode ray tube for displaying characters, numerals and patterns comprising a cathode electrode for emitting electrons, a grid mesh electrode for uniformly dispersing electrons emitted from said cathode, an electron lens means, a deflection means, and a character forming means disposed between said cathode electrode and said electron lens means, said character forming means being characterized by comprising a character substrate provided with a plurality of character pattern perforations which are arranged in the form of characters, and providing for each of said character pattern perforations an X-axis selector electrode including a plurality of X-axis electrode elements each having numerous perforations for passing electrons and a Y-axis selector electrode including a plurality of Y-axis electrode elements each having numerous perforations for passing electrons, said X- and Y-axis electrode elements being arranged in a matrix so that a desired character pattern region constituting numerous elemental beams is determined by selecting the matrix coordinates of said electrode elements to shape the electron beam paSsing through said region by the corresponding said character pattern perforation of said character forming substrate.
2. The cathode ray tube according to claim 1 wherein said character substrate is a thin sheet of insulator.
3. The cathode ray tube according to claim 1 wherein said X- and Y-axis selector electrodes are disposed on the opposite sides of said character substrate but closely spaced therefrom.
4. The cathode ray tube according to claim 1 wherein said X- and Y-axis electrodes are assembled in close proximity to form a matrix and the assembly is positioned one side of said character substrate.
5. The cathode ray tube according to claim 1 wherein the character pattern perforations of said character substrate and perforations of said X- and Y-axis electrode elements align with each other when they are assembled.
US864797A 1968-11-19 1969-10-08 Cathode ray tube character mask with plurality of perforations for each character Expired - Lifetime US3651361A (en)

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JP43084152A JPS4814384B1 (en) 1968-11-19 1968-11-19

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JP (1) JPS4814384B1 (en)
BE (1) BE740824A (en)
DE (1) DE1957968C3 (en)
FR (1) FR2023605A1 (en)
GB (1) GB1290387A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846630A (en) * 1970-01-07 1974-11-05 Zeev D Ben Method for identifying elemental areas of a photocathode
US3882339A (en) * 1974-06-17 1975-05-06 Gen Electric Gridded X-ray tube gun
US4193014A (en) * 1976-07-10 1980-03-11 English Electric Valve Company Limited Display arrangements
US4306178A (en) * 1978-10-04 1981-12-15 English Electric Valve Company Display arrangements

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4338541A (en) * 1979-12-07 1982-07-06 International Business Machines Corporation Multiple beam cathode ray tube having reduced off-axis aberrations
DE3375250D1 (en) * 1982-11-18 1988-02-11 Secr Defence Brit Information display devices
JP4895087B2 (en) * 2005-09-29 2012-03-14 集塵装置株式会社 Wet bag filter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718611A (en) * 1952-10-31 1955-09-20 Gen Dynamics Corp Cathode ray control apparatus
US2862144A (en) * 1958-03-21 1958-11-25 Gen Dynamics Corp Simplified system for character selection in a shaped beam tube
US2965801A (en) * 1954-12-23 1960-12-20 Philips Corp Method of and apparatus for position-selection, scanning and the like
US3198976A (en) * 1960-04-28 1965-08-03 Rank Precision Ind Ltd Electric discharge tubes and applications thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718611A (en) * 1952-10-31 1955-09-20 Gen Dynamics Corp Cathode ray control apparatus
US2965801A (en) * 1954-12-23 1960-12-20 Philips Corp Method of and apparatus for position-selection, scanning and the like
US2862144A (en) * 1958-03-21 1958-11-25 Gen Dynamics Corp Simplified system for character selection in a shaped beam tube
US3198976A (en) * 1960-04-28 1965-08-03 Rank Precision Ind Ltd Electric discharge tubes and applications thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846630A (en) * 1970-01-07 1974-11-05 Zeev D Ben Method for identifying elemental areas of a photocathode
US3882339A (en) * 1974-06-17 1975-05-06 Gen Electric Gridded X-ray tube gun
US4193014A (en) * 1976-07-10 1980-03-11 English Electric Valve Company Limited Display arrangements
US4306178A (en) * 1978-10-04 1981-12-15 English Electric Valve Company Display arrangements

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BE740824A (en) 1970-04-01
GB1290387A (en) 1972-09-27
JPS4814384B1 (en) 1973-05-07
FR2023605A1 (en) 1970-08-21
DE1957968B2 (en) 1973-12-20
DE1957968C3 (en) 1974-08-01
DE1957968A1 (en) 1970-08-13

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