DE874345C - Voting indicator tubes - Google Patents
Voting indicator tubesInfo
- 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
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)
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)
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)
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 |
-
1940
- 1940-04-12 DE DET917D patent/DE874345C/en not_active Expired
Patent Citations (3)
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)
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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