EP0234340A1 - Picture pick-up tube - Google Patents

Picture pick-up tube Download PDF

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Publication number
EP0234340A1
EP0234340A1 EP87101401A EP87101401A EP0234340A1 EP 0234340 A1 EP0234340 A1 EP 0234340A1 EP 87101401 A EP87101401 A EP 87101401A EP 87101401 A EP87101401 A EP 87101401A EP 0234340 A1 EP0234340 A1 EP 0234340A1
Authority
EP
European Patent Office
Prior art keywords
electron beam
tube
control electrode
aperture diaphragm
image
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.)
Withdrawn
Application number
EP87101401A
Other languages
German (de)
French (fr)
Inventor
Bernd Stamm
Wolfgang Vollmer
Manfred Dipl.-Ing. Witzky
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.)
Heimann GmbH
Original Assignee
Heimann GmbH
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 Heimann GmbH filed Critical Heimann GmbH
Publication of EP0234340A1 publication Critical patent/EP0234340A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • 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
    • H01J29/48—Electron guns
    • H01J29/485—Construction of the gun or of parts thereof

Definitions

  • an image recording tube comprises a closed, evacuated glass bulb 1, at the rear end of which an oxide cathode 3 heated by indirect heating 2, a control electrode 4 determining the intensity of the electron beam and an aperture diaphragm 5 are arranged, which together form the electron gun system .
  • the electron beam generator 2 to 5 determines the quality of the entire image pickup tube in two ways. It can, due to inaccurate centering or due to angular errors in the assembly of the individual electrodes, cause the scanning electron beam to enter the electrode at an angle, with the result that the angle of incidence of the electrons on the surface of the photosensitive layer behind the front pane 8 in places of 90 ° deviates. This preferably leads to signal irregularities.
  • Vibrations to which the image pick-up tube can be exposed can also be amplified by excitation of the resonance frequencies of the beam generator, propagate in the tube via the glass bulb 1 to the field network 7 and cause it to vibrate itself, which leads to disturbing microphone stripes in the image signal.
  • the invention is based on the object of designing an image pickup tube in such a way that image errors of the type described are avoided or, in the case of microphone, are reduced to such an extent that they no longer constitute a significant disturbance.
  • control electrode determining the intensity of the electron beam and the adjacent aperture diaphragm are soldered to a common ceramic ring.
  • image errors which are attributable to defective adjustment and inaccuracies in the structure of the electron beam generator are avoided.
  • compact connection between the control electrode and aperture diaphragm significantly improves the microphone behavior.
  • FIG. 2 shows only the parts of the image recording tube that are essential for the invention.
  • control electrode 4 and the aperture diaphragm 5 are soldered to one another using an insulating ceramic ring 9. Due to this compact design, the resonance frequency is shifted to higher frequencies, which reduces the excitability of the component and the amplitudes of the vibrations.

Abstract

The control electrode (4) determining the intensity of the electron beam and the aperture diaphragm (5) are soldered to a common ceramic ring (9). This avoids picture faults which are caused by incorrect adjustment and inaccuracies in the construction of the electron beam generator. At the same time, the microphone characteristic is significantly improved because of the compact connection between the control electrode (4) and the aperture diaphragm (5). <IMAGE>

Description

Eine Bildaufnahmeröhre umfaßt wie in Figur 1 schematisch dargestellt, einen verschlossenen, evakuierten Glaskolben 1, an dessen hinterem Ende eine durch indirekte Heizung 2 geheizte Oxydkathode 3, eine die Intensität des Elektro­nenstrahles bestimmende Steuerelektrode 4 und eine Aper­turblende 5 angeordnet sind, die zusammen das Elektronen­strahlerzeugersystem bilden. Es folgen eine zylinderför­mige Elektrode 6, in deren Innerem die Fokussierung und Ablenkung stattfinden, das Feldnetz 7 sowie die Front­scheibe 8, auf der die photoleitende Schicht aufgebracht ist.As shown schematically in FIG. 1, an image recording tube comprises a closed, evacuated glass bulb 1, at the rear end of which an oxide cathode 3 heated by indirect heating 2, a control electrode 4 determining the intensity of the electron beam and an aperture diaphragm 5 are arranged, which together form the electron gun system . This is followed by a cylindrical electrode 6, inside which the focusing and deflection take place, the field network 7 and the front screen 8, on which the photoconductive layer is applied.

Der Elektronenstrahlerzeuger 2 bis 5 bestimmt in zweier­lei Hinsicht die Qualität der gesamten Bildaufnahmeröhre. Es kann, durch ungenaue Zentrierung oder durch Winkelfeh­ler beim Zusammenbau der Einzelelektroden verursacht, der abtastende Elektronenstrahl unter einem Winkel in die Elektrode eintreten, was zur Folge hat, daß der Auftreff­winkel der Elektronen auf der Oberfläche der photoemp­findlichen Schicht hinter der Frontscheibe 8 stellenweise von 90° abweicht. Dies führt bevorzugt zu Signalungleich­mäßigkeiten.The electron beam generator 2 to 5 determines the quality of the entire image pickup tube in two ways. It can, due to inaccurate centering or due to angular errors in the assembly of the individual electrodes, cause the scanning electron beam to enter the electrode at an angle, with the result that the angle of incidence of the electrons on the surface of the photosensitive layer behind the front pane 8 in places of 90 ° deviates. This preferably leads to signal irregularities.

Es können ferner Vibrationen, denen die Bildaufnahmeröhre ausgesetzt sein kann, durch Anregung der Resonanzfrequen­zen des Strahlerzeugers verstärkt werden, sich in der Röhre über den Glaskolben 1 bis zum Feldnetz 7 fortpflan­zen und dieses selbst in Schwingungen versetzen, was im Bildsignal zu störenden Mikrofoniestreifen führt.Vibrations to which the image pick-up tube can be exposed can also be amplified by excitation of the resonance frequencies of the beam generator, propagate in the tube via the glass bulb 1 to the field network 7 and cause it to vibrate itself, which leads to disturbing microphone stripes in the image signal.

Der Erfindung liegt die Aufgabe zugrunde, eine Bildauf­nahmeröhre so auszubilden, daß Bildfehler der beschrie­benen Art vermieden oder im Falle der Mikrofonie so weit verringert sind, daß sie keine wesentliche Störung mehr darstellen.The invention is based on the object of designing an image pickup tube in such a way that image errors of the type described are avoided or, in the case of microphone, are reduced to such an extent that they no longer constitute a significant disturbance.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß die die Intensität des Elektronenstrahles bestimmende Steuer­elektrode und die benachbarte Aperturblende mit einem ge­meinsamen Keramikring verlötet sind. Bei der erfindungs­gemäßen Bildaufnahmeröhre werden Bildfehler, die auf man­gelhafte Justierung und Ungenauigkeiten im Aufbau des Elektronenstrahlerzeugers zurückzuführen sind, vermieden. Gleichzeitig wird durch die kompakte Verbindung zwischen Steuerelektrode und Aperturblende das Mikrofonieverhalten deutlich verbessert.This object is achieved in that the control electrode determining the intensity of the electron beam and the adjacent aperture diaphragm are soldered to a common ceramic ring. In the image pick-up tube according to the invention, image errors which are attributable to defective adjustment and inaccuracies in the structure of the electron beam generator are avoided. At the same time, the compact connection between the control electrode and aperture diaphragm significantly improves the microphone behavior.

Die Erfindung ist nachfolgend anhand eines in der Figur 2 dargestellten Ausführungsbeispieles näher erläutert. Die Figur 2 zeigt dabei nur die für die Erfindung wesentli­chen Teile der Bildaufnahmeröhre.The invention is explained in more detail below on the basis of an exemplary embodiment shown in FIG. FIG. 2 shows only the parts of the image recording tube that are essential for the invention.

Aus der Figur 2 geht hervor, daß die Steuerelektrode 4 und die Aperturblende 5 unter Verwendung eines isolieren­den Keramikringes 9 miteinander verlötet sind. Aufgrund dieses kompakten Aufbaus wird die Resonanzfrequenz zu höheren Frequenzen verschoben, was die Anregbarkeit des Bauteiles verringert und die Amplituden der Schwingungen verkleinert.It can be seen from FIG. 2 that the control electrode 4 and the aperture diaphragm 5 are soldered to one another using an insulating ceramic ring 9. Due to this compact design, the resonance frequency is shifted to higher frequencies, which reduces the excitability of the component and the amplitudes of the vibrations.

Claims (1)

Bildaufnahmeröhre, dadurch gekenn­zeichnet, daß die die Intensität des Elektro­nenstrahles bestimmende Steuerelektrode (4) und die be­nachbarte Aperturblende (5) mit einem gemeinsamen Kera­mikring (9) verlötet sind.Image recording tube, characterized in that the control electrode (4) determining the intensity of the electron beam and the adjacent aperture diaphragm (5) are soldered to a common ceramic ring (9).
EP87101401A 1986-02-17 1987-02-03 Picture pick-up tube Withdrawn EP0234340A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19868604185 DE8604185U1 (en) 1986-02-17 1986-02-17 Image pickup tube
DE8604185U 1986-02-17

Publications (1)

Publication Number Publication Date
EP0234340A1 true EP0234340A1 (en) 1987-09-02

Family

ID=6791763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101401A Withdrawn EP0234340A1 (en) 1986-02-17 1987-02-03 Picture pick-up tube

Country Status (3)

Country Link
EP (1) EP0234340A1 (en)
JP (1) JPS62133357U (en)
DE (1) DE8604185U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415562A2 (en) * 1989-08-31 1991-03-06 Tektronix Inc. Grid assemblies for use in cathode ray tube
EP0638919A1 (en) * 1993-08-09 1995-02-15 Sony Corporation Electron gun for crt

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR833364A (en) * 1937-02-11 1938-10-20 Lorenz C Ag Radiation device for braun tubes and tubes fitted with this device
US2170663A (en) * 1935-03-30 1939-08-22 Rca Corp Electron discharge device
GB747858A (en) * 1951-11-01 1956-04-18 Standard Telephones Cables Ltd Electron gun
US2916649A (en) * 1957-06-12 1959-12-08 Itt Electron gun structure
US3531853A (en) * 1966-11-30 1970-10-06 Philips Corp Method of making a ceramic-to-metal seal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2170663A (en) * 1935-03-30 1939-08-22 Rca Corp Electron discharge device
FR833364A (en) * 1937-02-11 1938-10-20 Lorenz C Ag Radiation device for braun tubes and tubes fitted with this device
GB747858A (en) * 1951-11-01 1956-04-18 Standard Telephones Cables Ltd Electron gun
US2916649A (en) * 1957-06-12 1959-12-08 Itt Electron gun structure
US3531853A (en) * 1966-11-30 1970-10-06 Philips Corp Method of making a ceramic-to-metal seal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415562A2 (en) * 1989-08-31 1991-03-06 Tektronix Inc. Grid assemblies for use in cathode ray tube
EP0415562A3 (en) * 1989-08-31 1991-10-23 Tektronix, Inc. Grid assemblies for use in cathode ray tube
EP0638919A1 (en) * 1993-08-09 1995-02-15 Sony Corporation Electron gun for crt
US5521462A (en) * 1993-08-09 1996-05-28 Sony Corporation Electron gun for CRT

Also Published As

Publication number Publication date
JPS62133357U (en) 1987-08-22
DE8604185U1 (en) 1986-04-30

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Inventor name: WITZKY, MANFRED, DIPL.-ING.

Inventor name: VOLLMER, WOLFGANG

Inventor name: STAMM, BERND