DE874345C - Voting indicator tubes - Google Patents

Voting indicator tubes

Info

Publication number
DE874345C
DE874345C DET917D DET0000917D DE874345C DE 874345 C DE874345 C DE 874345C DE T917 D DET917 D DE T917D DE T0000917 D DET0000917 D DE T0000917D DE 874345 C DE874345 C DE 874345C
Authority
DE
Germany
Prior art keywords
cathode
luminescent screen
grid
slope
potential
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
Application number
DET917D
Other languages
German (de)
Inventor
Herbert Dr Daene
Paul Dr Wolf
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Priority to DET917D priority Critical patent/DE874345C/en
Application granted granted Critical
Publication of DE874345C publication Critical patent/DE874345C/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J31/14—Magic-eye or analogous tuning indicators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/06—Tubes with a single discharge path having electrostatic control means only
    • H01J21/10—Tubes with a single discharge path having electrostatic control means only with one or more immovable internal control electrodes, e.g. triode, pentode, octode
    • H01J21/12—Tubes with variable amplification factor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/001—Non-constructive schematic arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0032—Tubes with variable amplification factor

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Description

In Rundfunkempfängern werden wiederholt sogenannte magische Augen zur Abstimmung benutzt. Diese magischen Augen besitzen einen konischen Leuchtschirm i (vgl. Abb. i).,. in dessen Achse sich eine vorzugsweise indirekt geheizte Kathode 2 befindet. Diese Kathode 2 ist von einem mit ihr auf gleichem Potential befindlichen Gitter 3 umschlossen. Außerdem sind Ablenkstxeben vorhanden, die zur Vereinfachung nicht dargestellt wurden.So-called magic eyes are repeatedly used in radio receivers used for voting. These magical eyes have a conical screen i (see Fig. i).,. in the axis of which there is a preferably indirectly heated cathode 2 is located. This cathode 2 is at the same potential as one of them Lattice 3 enclosed. There are also distraction levels to make things easier were not shown.

Es hat sich nun gezeigt, daß im Betrieb bei kleiner Leuchtschirmspannung der obere Rand des Leuchtschirms nicht mehr voll ausgeleuchtet wird. Dies liegt daran, daß die Elektronen infolge des dort verhältnismäßig kleinen Durchgriffs den oberen Teil des Leuchtschirms nicht mehr erreichen. Gemäß der Erfindung wird diese Störung dadurch beseitigt, daß der Durchgriff des Leuchtschirms auf die Kathode gleichmäßig gemacht wird. Die Vergleichsmäßigung des Durchgriffs kann entweder in der Weise erfolgen, daß das an sich bekannte Gitter mit einer 'von unten nach oben zunehmenden Steigung gewickelt wird (Abb.2. Gitter 4) oder daß zwischen dem an sich bekannten Gitter 3 und der Anode ein zusätzliches, auf Anodenpotential oder einem anderen positiven Potential befindliches Gitter 5 (Abb. 3) vorgesehen wird.It has now been shown that in operation with a low fluorescent screen voltage the upper edge of the fluorescent screen is no longer fully illuminated. This lies because the electrons due to the relatively small penetration there can no longer reach the upper part of the fluorescent screen. According to the invention this Interference is eliminated by the penetration of the fluorescent screen on the cathode is made evenly. The equalization of the penetration can be done either in done in such a way that the known grid with a 'from bottom to top increasing slope is wound (Fig.2. Grid 4) or that between the per se known grid 3 and the anode an additional one, at anode potential or one Another positive potential located grid 5 (Fig. 3) is provided.

Claims (1)

PATENTANSPRÜCHE: i. Abstimmungsanzeigeröhre mit konischem, eine Kathode umschließenden Leuchtschirm, bei der zwischen Kathode und Leuchtschirm ein auf Kathodenpotential befindliches Gitter vorgesehen ist, dadurch gekennzeichnet, daß die Gittersteigung derart verschieden ist, daß an der Stelle geringsten Abstandes zwischen Kathode und Leuchtschirm die kleinste Steigung und an der Stelle größten Abstandes die größte Steigung vorhanden ist. z. Abstimmungsanzeigeröhre mit konischem, eine Kathode umschließenden Leuchtschirm, bei der zwischen Kathode und Leuchtschirm ein auf Kathodenpotential befindliches Gitter vorgesehen ist, dadurch gekennzeichnet, daß zwischen dem Gitter und dem Leuchtschirm ein weiteres auf positivem, vorzugsweise auf Leuchtschirmpotential befindliches Gitter angeordnet ist. Angezogene Druckschriften: USA.-Patentschriften Nr. I 994 733, 2 I22 268; französische Patentschrift Nr. 742 5I6.PATENT CLAIMS: i. Voting indicator tube with conical, one cathode surrounding luminescent screen, with a cathode potential between the cathode and luminescent screen located grid is provided, characterized in that the grid slope is so different that at the point of smallest distance between cathode and the luminescent screen has the smallest slope and the largest at the point of greatest distance Slope is present. z. Voting indicator tube with a conical shape surrounding a cathode Luminescent screen with a cathode potential between the cathode and the luminescent screen located grid is provided, characterized in that between the grid and the luminescent screen another at positive, preferably luminescent screen potential located grid is arranged. Referenced Publications: United States Patents No. I 994 733, 2 I22 268; French patent specification No. 742 5I6.
DET917D 1940-04-11 1940-04-12 Voting indicator tubes Expired DE874345C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET917D DE874345C (en) 1940-04-11 1940-04-12 Voting indicator tubes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE871676X 1940-04-11
DET917D DE874345C (en) 1940-04-11 1940-04-12 Voting indicator tubes

Publications (1)

Publication Number Publication Date
DE874345C true DE874345C (en) 1953-04-23

Family

ID=25952293

Family Applications (1)

Application Number Title Priority Date Filing Date
DET917D Expired DE874345C (en) 1940-04-11 1940-04-12 Voting indicator tubes

Country Status (1)

Country Link
DE (1) DE874345C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1040129B (en) * 1952-04-22 1958-10-02 Sebel S A Cathode ray fluorescent lamp

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR742516A (en) * 1931-08-15 1933-03-08
US1994733A (en) * 1934-07-25 1935-03-19 Rca Corp Tuning indicator tube
US2122268A (en) * 1937-09-29 1938-06-28 Rca Corp Tuning indicator tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR742516A (en) * 1931-08-15 1933-03-08
US1994733A (en) * 1934-07-25 1935-03-19 Rca Corp Tuning indicator tube
US2122268A (en) * 1937-09-29 1938-06-28 Rca Corp Tuning indicator tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1040129B (en) * 1952-04-22 1958-10-02 Sebel S A Cathode ray fluorescent lamp

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