US2860302A - Life indicator for high voltage tubes - Google Patents

Life indicator for high voltage tubes Download PDF

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Publication number
US2860302A
US2860302A US515454A US51545455A US2860302A US 2860302 A US2860302 A US 2860302A US 515454 A US515454 A US 515454A US 51545455 A US51545455 A US 51545455A US 2860302 A US2860302 A US 2860302A
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US
United States
Prior art keywords
tube
tubes
ray
cathode
rays
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
US515454A
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English (en)
Inventor
Gier Johannes De
Janssen Johannes Cornelis
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2860302A publication Critical patent/US2860302A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01J9/42—Measurement or testing during manufacture

Definitions

  • a known life indicator involves the provision on the envelope of the discharge tube of materials or strips which gradually change color due to the heat produced during operation.
  • the magnitude of the color change enables the duration of operation of the tube to be determined.
  • this change in color is substantially independent of the extent to which the tube was actually used, since the temperature is only slightly dependent upon variations in the average anode current. Further, such indicators cannot be used in tubes which are substantially unheated during operation, such as cathode-ray tubes.
  • an indicator comprising a substance which is sensitive or responsive to soft X-rays.
  • sensitive substance denotes a substance which upon irradiation by soft X-rays produces a directly or indirectly perceptible change of some form.
  • a very suitable construction involves an X-ray film strip Wrapped up in a light-proof housing and affixed to the outer side of the tube wall. After development of the film strip, the extent of blackening thereof enables a determination to be made as to what part of its normal expected life the tube has already spent.
  • the invention is based upon the realization that, in cathode-ray tubes and transmitter tubes, soft X-rays are produced due to the fact that electrons impinge on a collector electrode at high velocity.
  • the fluorescent screen acts as the collector electrode.
  • the sensitive layer may be applied to the cone of the envelope, for example, in the form of a strip extending in the direction of a generatrix of the cone. The parts of the strip which are more remote from the screen are struck to a smaller extent by the X-rays emitted from this screen, so that the blackening gradually decreases in the direction from. the screen to the neck of the cone.
  • the sensitive substance may advantageously be arranged on the inner side.
  • Fig. 1 shows an indicator according to the invention mounted on a cathode-ray tube
  • Fig. 2 shows an indicator in accordance with the invention.
  • a cathode-ray tube comprises a fluorescent screen 1, a cone 2 which in this case may be. made of glass, and a neck 3 housing an electrode system.
  • an Xray film strip 4 wrapped up in black paper, and metal discs 5 are mounted between the film 4 and the cone wall 2.
  • the strip 4 will be struck by soft X-rays generated at the screen 1, most intensely at the end adjacent the screen 1. The longer that the tube is operated, the further will the blackening extend in the direction of the neck 3.
  • the metal plates 5 enable an ascertainment as to how far the blackening has proceeded.
  • the developed film strip shows that the tube has used approximately 60% of its normal life, the plates 5 here serving as markers or indicia to facilitate the observation.
  • Theintensity of the X-radiation is dependent not only on the voltage, but also on the brightness of the image, i. e., of the beam current strength, so that a more intense use of the tube causes an increase in the blackening.
  • the position of the articles 5 is recognizable by the areas 6 which are blackened to a lesser degree.
  • the use of the invention enables one to accurately ascertain whether or not a manufacturing defect is responsible.
  • fraud can be established, for the film strip may be entirely covered by a coating layer which is applied to the outer side of the glass cone, for example, a lacquer layer or a metal layer, so that removal of this layer will inevitably leave traces.
  • the metal plates 5 may be shaped in other forms; they may, for example, be designed as a strip containing notches or having numerals punched in it.
  • an electric discharge tube containing electron-producing and electron-receiving electrodes adapted to operate at relatively high potentials such that the impact of electrons on said electron-receiving electrode generates X-radiation, and means arranged near said electron-receiving electrode and responsive to X-radiation for indicating the lifetime of the tube, said means including an element whose appearance changes in accordance with the intensity of incident X-radiation and arranged so that some portions of it are nearer the electron-receiving electrode than others of its portions.
  • a cathode-ray tube comprising an evacuated envelope and electron-producing means and adapted to have comparatively high potentials applied thereto thus to produce soft X-rays, and means coupled to said tube for indicating its lifetime, said indicating means including a soft X-ray responsive member arranged in the evacuated envelope in a position Where it cannot be impacted by electrons during the normal operation of the tube.
  • the indicating means comprises a photographic film strip in a light-opaque enclosure and extending in the direction of a generatrix of the conical portion.
  • a cathode-ray tube comprising an evacuated envelope including a glass conical portion and adapted to have comparatively high potentials applied thereto thus to produce soft X-rays, and means coupled to said tube for indicating its life, said indicating means including a soft X-ray responsive film strip mounted on the outer side of the glass conical portion, and an X-ray absorbing member mounted between the glass conical portion and a portion of the film strip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • X-Ray Techniques (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Measurement Of Radiation (AREA)
US515454A 1954-06-28 1955-06-14 Life indicator for high voltage tubes Expired - Lifetime US2860302A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL2860302X 1954-06-28
NL331355X 1954-06-28
NL955798X 1954-06-28

Publications (1)

Publication Number Publication Date
US2860302A true US2860302A (en) 1958-11-11

Family

ID=75299983

Family Applications (1)

Application Number Title Priority Date Filing Date
US515454A Expired - Lifetime US2860302A (en) 1954-06-28 1955-06-14 Life indicator for high voltage tubes

Country Status (6)

Country Link
US (1) US2860302A (xx)
JP (1) JPS336430B1 (xx)
CH (1) CH331355A (xx)
DE (1) DE955798C (xx)
FR (1) FR1126728A (xx)
NL (1) NL85203C (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329648A (en) * 1980-07-21 1982-05-11 Rca Corporation Method of checking for electrical frit breakdown in kinescopes and apparatus therefor

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190317666A (en) * 1903-08-14 1903-09-24 Guido Holzknecht Means for Determining the Action of Röntgen Rays.
GB191002432A (en) * 1909-02-01 1910-08-11 Felten And Guilleaume Lahmeyer Improved Means for Checking the use of Electric Lighting Apparatus and more particularly of Electric Glow Lamps.
US1077479A (en) * 1913-05-01 1913-11-04 Gen Electric Device adapted to show whether an electric incandescent lamp has been in use.
FR792092A (fr) * 1934-08-06 1935-12-21 Telefunken Gmbh Perfectionnements aux appareils fonctionnant à l'état d'échauffement et, en particulier, aux lampes électroniques
US2381261A (en) * 1942-08-28 1945-08-07 Smith Corp A O X-ray film holder
US2496218A (en) * 1947-12-16 1950-01-31 Kieffer Jean Method and apparatus for determining radiation dosage
US2509766A (en) * 1947-01-24 1950-05-30 Gen Aniline & Film Corp Color film for normally invisible radiations
US2624011A (en) * 1951-03-27 1952-12-30 Kurt G Stern Self-developing pocket radiation dosimeter
US2722519A (en) * 1952-11-03 1955-11-01 Kurt O Otley Radiation sensitive glass

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190317666A (en) * 1903-08-14 1903-09-24 Guido Holzknecht Means for Determining the Action of Röntgen Rays.
GB191002432A (en) * 1909-02-01 1910-08-11 Felten And Guilleaume Lahmeyer Improved Means for Checking the use of Electric Lighting Apparatus and more particularly of Electric Glow Lamps.
US1077479A (en) * 1913-05-01 1913-11-04 Gen Electric Device adapted to show whether an electric incandescent lamp has been in use.
FR792092A (fr) * 1934-08-06 1935-12-21 Telefunken Gmbh Perfectionnements aux appareils fonctionnant à l'état d'échauffement et, en particulier, aux lampes électroniques
US2381261A (en) * 1942-08-28 1945-08-07 Smith Corp A O X-ray film holder
US2509766A (en) * 1947-01-24 1950-05-30 Gen Aniline & Film Corp Color film for normally invisible radiations
US2496218A (en) * 1947-12-16 1950-01-31 Kieffer Jean Method and apparatus for determining radiation dosage
US2624011A (en) * 1951-03-27 1952-12-30 Kurt G Stern Self-developing pocket radiation dosimeter
US2722519A (en) * 1952-11-03 1955-11-01 Kurt O Otley Radiation sensitive glass

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329648A (en) * 1980-07-21 1982-05-11 Rca Corporation Method of checking for electrical frit breakdown in kinescopes and apparatus therefor

Also Published As

Publication number Publication date
JPS336430B1 (xx) 1958-08-13
CH331355A (de) 1958-07-15
FR1126728A (fr) 1956-11-29
DE955798C (de) 1957-01-10
NL85203C (xx)

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