US1994733A - Tuning indicator tube - Google Patents

Tuning indicator tube Download PDF

Info

Publication number
US1994733A
US1994733A US736833A US73683334A US1994733A US 1994733 A US1994733 A US 1994733A US 736833 A US736833 A US 736833A US 73683334 A US73683334 A US 73683334A US 1994733 A US1994733 A US 1994733A
Authority
US
United States
Prior art keywords
cathode
anode
grid
electrons
tuning indicator
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
US736833A
Other languages
English (en)
Inventor
Browder J Thompson
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.)
RCA Corp
Original Assignee
RCA 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 NL41801D priority Critical patent/NL41801C/xx
Priority to US722746A priority patent/US2108880A/en
Application filed by RCA Corp filed Critical RCA Corp
Priority to US736833A priority patent/US1994733A/en
Application granted granted Critical
Publication of US1994733A publication Critical patent/US1994733A/en
Priority to DE1935R0093176 priority patent/DE694893C/de
Priority to DER102325D priority patent/DE715565C/de
Priority to DER106619D priority patent/DE715768C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01J19/02—Electron-emitting electrodes; Cathodes
    • 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

Definitions

  • My invention relates to electron discharge devices, more particularly to such devices used as visual indicators of voltage and having a fluorescent electrode which is rendered luminous and a produces the appearance of a column of light the length of which depends upon the magnitude of the applied voltage, a device of this character being particularly useful as a tuning .indicator in radio receiving sets.
  • the present invention is an improvement over a device of the general character described and claimed in a co-pending application of Rene A. Braden, Serial No. 722,746 filed April 2'], 1934 and assigned to the same assignee as the present invention.
  • One embodiment of such a device useful as a tuning indicator and described in the Braden application above referred to comprises an envelope having within it a straight filamentary thermionic cathode, a fiat control grid of uniform pitch and a flat plate or anode coated with material which fluoresces under electron bombardment.
  • electrons flow from the cathode to the plate with sufiicient velocity to bombard the plate and render it luminous.
  • the control grid is so connected in a radio receiving circuit that when the circuit is tuned to resonance with an incoming signal the luminous portion of the plate is of predetermined length.
  • the device is so connected that the luminous portion of the anode is of minimum length when the circuit is tuned exactly to resonance.
  • FIG. 1 is a perspective view, with parts broken away, of an electron discharge device made in accordance with my invention
  • Figure 2 is an enlarged partial view of the anode electrode
  • Figure 3 is a schematic diagram of a portion of a radio receiving circuit using an electron discharge device such as shown in Figure 1 for indicating resonance.
  • the electron discharge device or tuning indicator tube shown in Figure l and constructed in accordance with my invention comprises an evacuated envelope 10, provided with the usual stem and press 11 and base 12. Supported from the press is a straight cathode 13, preferably 2.
  • a variable pitch helical control grid 1i concentric and substantially coextensive with and surrounding the cathode.
  • the pitch of the turns of the control grid preferably varies progressively a from one end of the grid to the other, and as shown in this particular embodiment the greatest pitch is at the bottom end of the grid.
  • Concentric and substantially coextensive with and surrounding the cathode and grid is a mesh anode 1o 15, which as best shown in Figure 2, has a coating fluorescent under electron bombardment, and to which is applied in normal operation a positive voltage with respect to the grid and cathode. Electrons emitted by the cathode and striking 15 the mesh anode cause it to become luminous wherever the electrons strike the anode.
  • a visual voltage indicating tube made in accordance with my invention and having an equipotential cathode and variable pitch grid instead of a filamentary cathode and uniform pitch grid at provides a greater electron emission from the cathode which promotes increased brilliancy oi. the anode, and provides a more positive control of the electron flow from the cathode to the anode.
  • a variable pitch grid it is possible 30 to open out or compress the scale of the luminous portion of the anode by varying the pitch of the grid. It is also possible with the variable pitch grid to provide a device which is more sensitive near the resonant point than elsewhere by using 35 suitable variations in the grid pitch.
  • the transformer 20 may be a radio frequency or intermediate-frequency transformer, the secondary of which is tuned by means of variable condenser 21.
  • the alternating voltage which appears across the terminals of the condenser 21 and secondary of the transformer 20 when tuned to an incoming signal is applied between the plate 22 and cathode 23 of a diode detector or rectifier tube 24, the'rectified current resulting in a voltage drop across the output resistor 25, the end connected to the condenser 21 acquiring a negative potential with respect to the end connected to the cathode 23 of tube 24.
  • the resistor 25 is by-passed for radio-frequency or intermediate-frequency currents by means of by-passing condenser 26.
  • the voltage across resistor 25 is applied to the tuning indicator tube 10 to indicate resonance.
  • the cathode 13 of the tuning indicator tube 10 is connected to the positive end of the resistor 25 while the grid 14 is connected to the negative end of the resistor 25.
  • a positive voltage with respect to the voltage on the grid and cathode is applied to the anode 15 of'the tube 10.
  • this negative bias on the grid determines the extent of the mesh anode reached by the electron flow with sufilcient velocity from the cathode to cause fiuoresence, the bias of the grid being at a maximum negative value and the length of the luminous portion of the anode being the shortest when the detector circuit is tuned to resonance with an incoming signal.
  • An electron discharge device having an envelope, a cathode within said envelope for emitting electrons, a mesh anode coextensive with said cathode for receiving electrons from said cathode, a variable pitch control grid positioned between said cathode and anode for determining the extent of the mesh anode reached by the electrons emitted by the cathode, and means for causing said mesh anode to fluoresce where the electrons strike said mesh anode.
  • An electron discharge device having an envelope, a cathode within said envelope for emitting electrons, a fluorescent mesh anode coextensive with said cathode for receiving electrons emitted from said cathode and a variable pitch control grid between said cathode and said fluorescent mesh anode for determining the extent of the mesh anode reached by the electrons-emitted by the cathode.
  • An electron discharge device having an envelope, a thermionic cathode within said envelope for emitting electrons, a mesh anode concentric with and surrounding said cathode for receiving electrons from said cathode and having a coating of fluorescent material which fluoresces when electrons from said cathode strike said anode with sufiicient velocity, and a variable pitch control grid intermediate said thermionic cathode and mesh anode and concentric therewith and adapted to have a varying voltage applied thereto for decreasing progressively and lengthwise of the cathode the electron flow from the cathode to the anode, whereby the length of the fluorescent portion of said anode is determined.
  • An electron discharge device having an envelope, a thermionic cathode within said envelope for emitting electrons, a mesh anode concentric and coextensive with and surrounding said cathode for receiving electrons from said cathode, and having a coating of fluorescent material, and a control grid positioned between said cathode and said mesh anode and comprising a helical coil surrounding said cathode, the pitch between the turns of said helical coil being progressively increased from one end of the grid to the other, said control grid determining the extent of the mesh anode reached by the electron flow from the cathode when a voltage is applied thereto.
  • An electron discharge device having an envelope, a straight cathode within said envelope for emitting e1ectrons,-a fluorescent mesh anode concentric and coextensive with and surrounding said cathode for receiving electrons from said cathode to cause said mesh anode to fiuoresce, and a variable pitch grid positioned between said anode and cathode for determining the length of the portion of the anode which fluoresces.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US736833A 1934-04-27 1934-07-25 Tuning indicator tube Expired - Lifetime US1994733A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL41801D NL41801C (enrdf_load_stackoverflow) 1934-07-25
US722746A US2108880A (en) 1934-04-27 1934-04-27 Electric discharge tube
US736833A US1994733A (en) 1934-07-25 1934-07-25 Tuning indicator tube
DE1935R0093176 DE694893C (de) 1934-04-27 1935-04-26 Abstimmanzeiger, insbesondere fuer Rundfunkempfaenger
DER102325D DE715565C (de) 1934-07-25 1935-04-26 Abstimmanzeiger, insbesondere fuer Rundfunkgeraete
DER106619D DE715768C (de) 1934-07-25 1935-07-16 Abstimmanzeiger, insbesondere fuer Rundfunkempfaenger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US736833A US1994733A (en) 1934-07-25 1934-07-25 Tuning indicator tube

Publications (1)

Publication Number Publication Date
US1994733A true US1994733A (en) 1935-03-19

Family

ID=24961472

Family Applications (1)

Application Number Title Priority Date Filing Date
US736833A Expired - Lifetime US1994733A (en) 1934-04-27 1934-07-25 Tuning indicator tube

Country Status (3)

Country Link
US (1) US1994733A (enrdf_load_stackoverflow)
DE (2) DE715565C (enrdf_load_stackoverflow)
NL (1) NL41801C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE874345C (de) * 1940-04-11 1953-04-23 Telefunken Gmbh Abstimmungsanzeigeroehre
US2648795A (en) * 1951-08-09 1953-08-11 Lee Electronic Labs Inc Visual electron flow indicator
US2956194A (en) * 1957-10-04 1960-10-11 Philips Corp Electron tube for the optical indication of an electrical magnitude
US5006762A (en) * 1990-04-09 1991-04-09 Gte Products Corporation Negative glow fluorescent lamp having discharge barrier

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971861C (de) * 1944-11-05 1959-04-09 Interessengemeinschaft Fuer Ru Kathodenstrahlroehre zur Anzeige von Messspannungen oder der Richtigkeit der Abstimmung bei Rundfunkempfaengern
DE950873C (de) * 1951-03-08 1956-10-18 Lorenz C Ag Vakuumroehre zur Messung und Anzeige elektrischer Spannungen, bei der auf einem Leuchtschirm ein Leuchtsektor erzeugt wird
DE1061910B (de) * 1952-03-20 1959-07-23 Standard Elektrik Lorenz Ag Spannungs- und Spannungsvergleichs-anzeigeroehre
DE1089485B (de) * 1952-07-16 1960-09-22 Standard Elektrik Lorenz Ag Spannungs- und Spannungsvergleichs-anzeigeroehre
DE1029490B (de) * 1952-10-01 1958-05-08 Telefunken Gmbh Anzeigeroehre mit zwei unabhaengig voneinander steuerbaren, parallel zur Kathode liegenden Ablenkelektroden oder Elektrodensystemen
DE1026885B (de) * 1957-04-20 1958-03-27 Philips Patentverwaltung Elektronenroehre zur optischen Spannungsanzeige, insbesondere Abstimmanzeigeroehre
DE1045556B (de) * 1957-05-31 1958-12-04 Standard Elektrik Lorenz Ag Abstimmanzeigeroehre

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE874345C (de) * 1940-04-11 1953-04-23 Telefunken Gmbh Abstimmungsanzeigeroehre
US2648795A (en) * 1951-08-09 1953-08-11 Lee Electronic Labs Inc Visual electron flow indicator
US2956194A (en) * 1957-10-04 1960-10-11 Philips Corp Electron tube for the optical indication of an electrical magnitude
US5006762A (en) * 1990-04-09 1991-04-09 Gte Products Corporation Negative glow fluorescent lamp having discharge barrier

Also Published As

Publication number Publication date
NL41801C (enrdf_load_stackoverflow)
DE715565C (de) 1942-01-02
DE715768C (de) 1942-01-07

Similar Documents

Publication Publication Date Title
US2200962A (en) Ultra short wave device
US1994733A (en) Tuning indicator tube
GB439755A (en) Improvements in or relating to thermionic valve arrangements
US2130162A (en) Tuning indicator tube
US1994726A (en) Tuning indicator tube
US2051188A (en) Tuning indicator tube
US2479964A (en) Glow-discharge lamp tuning indicator
US2175700A (en) Electronic indicating device
US2418844A (en) Ultra high frequency tube
US2108880A (en) Electric discharge tube
US2122268A (en) Tuning indicator tube
US2122267A (en) Tuning indicator circuits
US2146016A (en) Electron discharge device
US2206954A (en) Electron discharge device
US2124740A (en) Electronic indicating device
US2015327A (en) Electron discharge device
US2113669A (en) Tuning indicator tube
US2273800A (en) Fluorescent type indicator tube
US3005930A (en) Electric discharge apparatus
US2311672A (en) Electron discharge tube with fluorescent screen
US2468197A (en) Transmitter tuning indicator
US2172152A (en) Radio frequency multipactor amplifier
US2465041A (en) Electron discharge device
US2081125A (en) Space discharge tube
US2145356A (en) Heterodyne receiver