US2597383A - Cathode-ray tube screen treatment - Google Patents

Cathode-ray tube screen treatment Download PDF

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Publication number
US2597383A
US2597383A US232311A US23231151A US2597383A US 2597383 A US2597383 A US 2597383A US 232311 A US232311 A US 232311A US 23231151 A US23231151 A US 23231151A US 2597383 A US2597383 A US 2597383A
Authority
US
United States
Prior art keywords
tube
screen
ray tube
cathode ray
imperfections
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
US232311A
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English (en)
Inventor
Arthur L Samuel
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 Business Machines Corp
Original Assignee
International Business Machines 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
Priority to BE512195D priority Critical patent/BE512195A/xx
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US232311A priority patent/US2597383A/en
Priority to GB4992/52A priority patent/GB700273A/en
Application granted granted Critical
Publication of US2597383A publication Critical patent/US2597383A/en
Priority to DEI5988A priority patent/DE926565C/de
Priority to FR1058490D priority patent/FR1058490A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
    • G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
    • G11C11/23—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using electrostatic storage on a common layer, e.g. Forrester-Haeff tubes or William 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/021—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof arrangements for eliminating interferences in the tube
    • 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
    • H01J29/18—Luminescent screens
    • H01J29/182—Luminescent screens acting upon the lighting-up of the luminescent material other than by the composition of the luminescent material, e.g. by infra red or UV radiation, heating or electric fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/44—Factory adjustment of completed discharge tubes or lamps to comply with desired tolerances

Definitions

  • FIG.1 CATHODE-RAY TUBE SCREEN TREATMENT Filed June 19, 1951 FIG.1
  • cathode ray tube screens produced even by the best manufacturing methods known in the past invariably have one or more imperfections which cause errors if the portion of the screen where the imperfection occurs is utilized for storage purposes.
  • Fig. 1 shows diagrammatically a circuit arrangement for testing a cathode ray tube screen for imperfections
  • Fig. 2 shows a Tesla coil circuit of the type utilized in the treatment of cathode ray tube screens according to the invention.
  • each cat ode ray tube IE3 is connected to an energization and vertical sweep circuit 1 2 whch energizes the tube electrodes and causes its electron beam to sweep its screen It in the vertical direction.
  • a foil or conducting coatiing I6 is positioned on the face of the tube adlament the screen [4 as shown and is connected to the input of amplifier IS.
  • the output of amplifier I8 is connected to the Z axis or intensity-control circuit of oscilloscope 20, whose horizontal sweep circuits are connected to the horizontal deflecting elements of tube 10 as indicated.
  • the vertical sweep circuits of circuits 12 are also connected to the Y axis or vertical deflecting elements of oscilloscope 20, and thus the time base sweeps of tube Ill and oscilloscope 2B are in synchronism.
  • the resultant scan on each is of the line-by-line type, but any desired form of scanning may be employed: 6. g., spiral,
  • a 1 kc. horizontal sweep was employed with a 2 c. p. s. vertical sweep.
  • a positioning voltage manually controllable, might be applied to the Y axis input of oscilloscope 20 and to the vertical deflecting elements of tube It! instead of utiliz ng the vertical sweep circuit disclosed.
  • a single line trace would appear on the face of tube [0 together with a corresponding single line trace on the indicator of oscilloscope 20, both traces being movable in synchronism up or down manually by adjustment of the positioning control.
  • the input to the amplifier 18 will be altered, resulting in an alteration of the intensity of the electron stream in the cathode ray tube of the oscilloscope 20.
  • visible indications 22 of the imperfections of the secondary emissive surface or screen I4 of the cathode ray tube 10 will be determined.
  • Tesla coil utilized has been the commercial Central Scientific Co. Catalogue No. 80730 High Frequency Coil of the Tesla Type. It is understood that the circuit of this is of the type shown in Fig. 2, which is given merely by way of example, andthat it produces:
  • the primary coil of transformer 30 is supplied with 110 v. 60 cycle A. C. and the turns ratioof this transformer is such that approximately 5,000 volts is proa quizd across the secondary thereof.
  • This high voltage is applied to a tank circuit 32. and ad-' justable air gap 35 in series.
  • Tank circuit 32. includes an inductance 33 and a condenser 34 connected in parallel with their parameters chosen such that the' tank circuit 32 is resonant at approximately 500 kc.
  • One terminal of the-second- .ary of transformer 30 is also grounded as shown.
  • the other terminal is connected through isolating condenser 36 to probe 31, which is applied to thefaceof the cathode ray tube H], as necessary, as'described above.
  • the high alternating voltage applied across air gap 35 causes the air dielectric in the gap to break down, each time the sine wave exceeds a certain value as determined by the dimension of the gap.
  • This breaking down of the air in the gap produces a ringing or oscillation of the tank circuit 32 at its resonant frequency, thereby producing bursts of high frequency energy'at probe 31 38' effectively isolates probe 31 from the A. C. power voltage but presents a negligible impedance to the high frequency energy.
  • Theprocess of treating the screen of a cathode ray tube to removeimperfections' and produce uniformity thereof comprises applying to the outer faceof the tube an alternating' voltage of the order of several thousand volts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
US232311A 1951-06-19 1951-06-19 Cathode-ray tube screen treatment Expired - Lifetime US2597383A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE512195D BE512195A (US08088918-20120103-C00476.png) 1951-06-19
US232311A US2597383A (en) 1951-06-19 1951-06-19 Cathode-ray tube screen treatment
GB4992/52A GB700273A (en) 1951-06-19 1952-02-26 Improvements in or relating to a process of making cathode ray tubes
DEI5988A DE926565C (de) 1951-06-19 1952-06-14 Verfahren zur Beseitigung von Ungleichmaessigkeiten (Fehlerstellen) im Schirm einer Kathodenstrahl-Speicherroehre
FR1058490D FR1058490A (fr) 1951-06-19 1952-06-18 Procédé pour le traitement de l'écran d'un tube à rayon cathodique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US232311A US2597383A (en) 1951-06-19 1951-06-19 Cathode-ray tube screen treatment

Publications (1)

Publication Number Publication Date
US2597383A true US2597383A (en) 1952-05-20

Family

ID=22872617

Family Applications (1)

Application Number Title Priority Date Filing Date
US232311A Expired - Lifetime US2597383A (en) 1951-06-19 1951-06-19 Cathode-ray tube screen treatment

Country Status (5)

Country Link
US (1) US2597383A (US08088918-20120103-C00476.png)
BE (1) BE512195A (US08088918-20120103-C00476.png)
DE (1) DE926565C (US08088918-20120103-C00476.png)
FR (1) FR1058490A (US08088918-20120103-C00476.png)
GB (1) GB700273A (US08088918-20120103-C00476.png)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1022734B (de) * 1953-02-09 1958-01-16 Douglas Aircraft Co Inc Schmiermittel und hydraulische Fluessigkeit
US2879394A (en) * 1953-11-04 1959-03-24 Asea Ab Exposure meter for electron microscopes
US2915662A (en) * 1956-08-24 1959-12-01 Nat Video Corp Centering arrangement and method for beams of cathode ray tubes
US3350153A (en) * 1967-10-31 Method of and apparatus for treating the electrodes of a cold discharge tube
US3366434A (en) * 1966-10-21 1968-01-30 Teltron Inc Method for rejuvenating an image orthicon tube
US3649907A (en) * 1970-03-11 1972-03-14 Nasa Method and apparatus for mapping the sensitivity of the face of a photodetector specifically a pmt
FR2397621A1 (fr) * 1977-07-14 1979-02-09 Philips Nv Procede pour determiner les variations de distance entre les surfaces opposees de l'electrode de selection des couleurs et de la fenetre d'image d'un tube d'images de television en couleur et dispositif pour la mise en oeuvre

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487641A (en) * 1946-09-07 1949-11-08 Philco Corp Electronic pointer for television images

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487641A (en) * 1946-09-07 1949-11-08 Philco Corp Electronic pointer for television images

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350153A (en) * 1967-10-31 Method of and apparatus for treating the electrodes of a cold discharge tube
DE1022734B (de) * 1953-02-09 1958-01-16 Douglas Aircraft Co Inc Schmiermittel und hydraulische Fluessigkeit
US2879394A (en) * 1953-11-04 1959-03-24 Asea Ab Exposure meter for electron microscopes
US2915662A (en) * 1956-08-24 1959-12-01 Nat Video Corp Centering arrangement and method for beams of cathode ray tubes
US3366434A (en) * 1966-10-21 1968-01-30 Teltron Inc Method for rejuvenating an image orthicon tube
US3649907A (en) * 1970-03-11 1972-03-14 Nasa Method and apparatus for mapping the sensitivity of the face of a photodetector specifically a pmt
FR2397621A1 (fr) * 1977-07-14 1979-02-09 Philips Nv Procede pour determiner les variations de distance entre les surfaces opposees de l'electrode de selection des couleurs et de la fenetre d'image d'un tube d'images de television en couleur et dispositif pour la mise en oeuvre

Also Published As

Publication number Publication date
BE512195A (US08088918-20120103-C00476.png)
DE926565C (de) 1955-04-21
GB700273A (en) 1953-11-25
FR1058490A (fr) 1954-03-16

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