US2130162A - Tuning indicator tube - Google Patents

Tuning indicator tube Download PDF

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Publication number
US2130162A
US2130162A US80474A US8047436A US2130162A US 2130162 A US2130162 A US 2130162A US 80474 A US80474 A US 80474A US 8047436 A US8047436 A US 8047436A US 2130162 A US2130162 A US 2130162A
Authority
US
United States
Prior art keywords
anode
cathode
control electrode
tube
voltage
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
US80474A
Other languages
English (en)
Inventor
Harry C 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 NL46087D priority Critical patent/NL46087C/xx
Priority to NL57947D priority patent/NL57947C/xx
Priority claimed from US28665A external-priority patent/US2051188A/en
Priority to US28689A priority patent/US2051189A/en
Application filed by RCA Corp filed Critical RCA Corp
Priority to US80474A priority patent/US2130162A/en
Priority to GB16781/36A priority patent/GB481791A/en
Priority to GB16780/36A priority patent/GB481790A/en
Priority to FR807964D priority patent/FR807964A/fr
Priority to CH203784D priority patent/CH203784A/de
Priority to DE1936R0096685 priority patent/DE692964C/de
Publication of US2130162A publication Critical patent/US2130162A/en
Application granted granted Critical
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
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • 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

Definitions

  • My invention relates to electron discharge devices, more particularly to such devices useful as visual indicators of voltage and having a fluorescent electrode which is rendered luminous, and has the appearance of a pattern of light which may be of constant height or length and varying width and which changes in response to the change in the magnitude of the applied voltage, a device of this character being particularly useful as a tuning indicator in radio receiving sets.
  • my invention comprises an envelope having within it a straight thermionic cathode having two separate electron emitting sections around one of which are positioned at least one grid and an anode.
  • the visual tuning indicator elements comprising preferably a straight control electrode parallel to the cathode, and an anode which may be flat or cylindrical and may be of sheet or of mesh material and coated with material which fluoresces in response to electron bombardment.
  • the electrons flow from the cathode to the anode with suflicient, velocity to bombard the plate and render it luminous.
  • the control electrode is electrically connected to the anode surrounding the grid and the elements of the tube are so connected in a radio receiving circuit that when the circuit is tuned to resonance with an incoming signal the luminous portion of the indicator anode is of a predetermined size.
  • the connection is such that the luminous portion of the anode is of a maXi mum width and hence the dark space of minimum width when the circuit is tuned to reso nance, the height or length remaining constant.
  • FIG. 1 shows an electron discharge device embodying my invention with parts broken away to show details of construction
  • Figure 2 is an enlarged top and side view showing details of construction of the voltage indicating elements of the tube shown in Figure 1
  • Figure 3 shows a circuit arrangement using a tube made in accordance with my invention
  • Figures 4 and 5 are top views of further modifications of the tuning indicator elements of the electron discharge device shown in Figure l.
  • the electron discharge device or tuning indicator tube shown in Figure 1 comprises an evacuated envelope l provided with the usual stem and press II, and base I 2. Supported from the press are a cathode l3, preferably the conventional indirectly heated equipotential type, a grid l4 and anode l surrounding the cathode.
  • I mount in the dome portion of the envelope Ill the visual indicating portion of the tube comprising a cathode, a control electrode and an anode having preferably a fiat surface presented to said cathode and control electrode and provided with a coating which fiuoresces when subjected to electron bombardment.
  • the anode having the fiuorescent coating may be of the mesh type and viewed from either side and might have fiat or curved surfaces, I may make it of fiat or curved sheet material and coat only one side, which may be directly viewed.
  • the cathode I3 is extended into the dome portion of the envelope as shown at I6 and has a second emitting section 16' for applying the electrons in the visual indicating device.
  • a control electrode 25 in the form of a cylinder provided with a longitudinal opening 26 through which electrons pass from the cathode emitting portion Hi to the flat coated anode 21 surrounds the cathode and is supported from a cross bar [8 electrically connected to the side rods 19 of the anode !5.
  • This control electrode determines the pattern of the luminescent portion of the anode Zl, which is shown as made of sheet material and coated with any conventional luminescent material, and is supported by rods 2! extending from the press II.
  • the voltage on the anode I5 is applied to the control electrode 25, the voltage on this electrode determining the width of the pattern of light on the anode 21, the height of the pattern of light being constant and equal to the height of the anode.
  • the luminescent portion of the voltage or tuning indicator may be viewed from the side of the tube with ease.
  • the emitting area l6 of the cathode I6 is confined as shown to prevent the control electrode 25 drawing anysubstantial amount of current.
  • the beam control electrode 25 is so biased that when no signal is being received the voltage difference between the control electrode 25 and the anode 21 is such that only the portion a of the anode is luminescent.
  • the set is tuned to resonance the voltage difference between the anode 21 and the electrode 25 becomes less, so that the control effect of the electrode 25 on the electrons leaving the cathode I6 is less, permitting electrons from the cathode IE to reach more of the anode 21 so that when the set is tuned to resonance the anode is luminous over the surface as shown by lines I).
  • the rectifier tube 42 has an anode 43 connected to one side of the radio frequency or intermediate frequency transformer 44 coupled to the receiving circuit not shown, and a cathode 45 connected through a grid leak 46 and by-pass condenser 41 to the other side of the transformer 44.
  • the cathode side of the transformer 44 is connected through resistor 48 to control grid 1 4 of the tuning indicator tube.
  • a radio frequency by-passing condenser 49 connects the grid to ground, and the conductor 50 may be connected to other parts of the circuit to provide automatic volume control.
  • the cathode side of the radio frequency transformer becomes negative with respect to ground due to the current through resistor 46.
  • This negative voltage is applied to the control grid 14 as a negative bias with the result that the current through the triode portion of the tube is reduced, thus causing the width of the luminescent portion of the tuning indicator anode 21 to increase as explained above.
  • the control electrode is positive with respect to the cathode.
  • a positive control electrode is suitable for direct coupling to an amplifier, that is it may be directly connected to the plate of an amplifier tube as shown in Figure 1 for example.
  • a tube made in accordance with my invention is not critical to variations in cathode temperatures and is susceptible for use with alternating and direct voltages and current:
  • control electrode 30 is a V- shaped member on one side of the electron emitting cathode l6 and the luminescent anode is similarly shaped with the coating on the side facing the cathode.
  • Figure 5 shows an arrangement very similar to that shown in Figure 4 except that the control electrodes 35 and anode 36 are flat.
  • control electrodes 30 and 35 may be connected to the grid of the triode section, so that they are biased negatively with respect to the cathode.
  • the luminescent portions between the lines a and b in Figures 4 and 5 indicate the luminescent portions when the circuit in which the tube is used is tuned and untuned to an incoming signal.
  • An electron discharge device having an envelope enclosing a straight thermionic electron emitting cathode, an anode having a flat surface adjacent said cathode and having a fluorescent coating thereon, a control electrode comprising a pair of straight conductors parallel to and on the opposite side of the cathode from said anode for determining the extent of the anode reached by the electrons emitted by the cathode.
  • An electron discharge device having an envelope, a cathode within the envelope having a plurality of electron emitting surfaces along its surface, a grid and anode surrounding one of said electron emitting surfaces and a fluorescent anode having a flat surface adjacent another of the electron emitting surfaces of said cathode and a, control electrode positioned on the opposite side of the cathode from said fluorescent anode and comprising a conductor parallel to the cathode and connected to the anode surrounding the grid for producing on said fluorescent anode a beam of substantially constant length and of a width depending upon the voltage applied to said control electrode through the anode around the grid.
  • An electron discharge device having an envelope, a straight thermionic cathode within said envelope for emitting electrons, a V-shaped anode adjacent the cathode and coextensive therewith and coated with a material which fluoresces when struck by electrons from said cathode and a control electrode comprising a V-shaped member on the other side of said cathode from said anode and coextensive with said cathode and anode, the width of the luminescent portion of the anode struck by said electrons being dependent on the voltage applied to said control electrode.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Amplifiers (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
US80474A 1935-06-27 1936-05-19 Tuning indicator tube Expired - Lifetime US2130162A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
NL46087D NL46087C (US07714131-20100511-C00038.png) 1935-06-27
NL57947D NL57947C (US07714131-20100511-C00038.png) 1935-06-27
US28689A US2051189A (en) 1935-06-27 1935-06-27 Tuning indicator tube
US80474A US2130162A (en) 1935-06-27 1936-05-19 Tuning indicator tube
GB16781/36A GB481791A (en) 1935-06-27 1936-06-16 Improvements in or relating to electron discharge devices
GB16780/36A GB481790A (en) 1935-06-27 1936-06-16 Improvements in or relating to electron discharge devices
FR807964D FR807964A (fr) 1935-06-27 1936-06-19 Tubes indicateurs d'accord, plus particulièrement pour postes radiorécepteurs
CH203784D CH203784A (de) 1935-06-27 1936-06-24 Elektrische Entladungsröhre zur optischen Spannungsanzeige.
DE1936R0096685 DE692964C (de) 1935-06-27 1936-06-28 ungen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28665A US2051188A (en) 1935-06-27 1935-06-27 Tuning indicator tube
US80474A US2130162A (en) 1935-06-27 1936-05-19 Tuning indicator tube

Publications (1)

Publication Number Publication Date
US2130162A true US2130162A (en) 1938-09-13

Family

ID=26703956

Family Applications (1)

Application Number Title Priority Date Filing Date
US80474A Expired - Lifetime US2130162A (en) 1935-06-27 1936-05-19 Tuning indicator tube

Country Status (6)

Country Link
US (1) US2130162A (US07714131-20100511-C00038.png)
CH (1) CH203784A (US07714131-20100511-C00038.png)
DE (1) DE692964C (US07714131-20100511-C00038.png)
FR (1) FR807964A (US07714131-20100511-C00038.png)
GB (2) GB481790A (US07714131-20100511-C00038.png)
NL (2) NL57947C (US07714131-20100511-C00038.png)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436393A (en) * 1944-12-29 1948-02-24 Bell Telephone Labor Inc Cathode-ray tube with discharge to deflecting plates
US2594025A (en) * 1949-09-09 1952-04-22 Siemens Ag Electron tube with luminescent shield, especially tuning tube
US2600063A (en) * 1951-02-20 1952-06-10 Leon S Maloof Visual electron flow indicator
US2611875A (en) * 1948-10-01 1952-09-23 Cons Eng Corp Electron source
US3174072A (en) * 1961-03-16 1965-03-16 Motorola Inc Recording level indicator and circuit

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950945C (de) * 1940-07-23 1956-10-18 Lorenz C Ag Spannungsanzeigeroehre, insbesondere Abstimmanzeigeroehre fuer Rundfunkgeraete, mit einem Anzeigesystem und einem weiteren, von ihm unabhaengigen Elektrodensystem fuer andere Zwecke
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
DE976143C (de) * 1952-01-31 1963-03-28 Standard Elek K Lorenz Ag Spannungsanzeigeroehre
BE517504A (US07714131-20100511-C00038.png) * 1952-02-08
DE941306C (de) * 1952-03-20 1956-04-05 Philips Patentverwaltung Elektronenstrahl-Abstimm-Anzeigeroehre
DE918949C (de) * 1952-04-30 1954-10-07 Lorenz C Ag Spannungsanzeigeroehre, bestehend aus Kathode, Blende und Leuchtschirm mit gleichem Durchgriff laengs der Kathodenachse
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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436393A (en) * 1944-12-29 1948-02-24 Bell Telephone Labor Inc Cathode-ray tube with discharge to deflecting plates
US2611875A (en) * 1948-10-01 1952-09-23 Cons Eng Corp Electron source
US2594025A (en) * 1949-09-09 1952-04-22 Siemens Ag Electron tube with luminescent shield, especially tuning tube
US2594026A (en) * 1949-09-09 1952-04-22 Siemens Ag Electron tube with luminescent shield, especially tuning tube
US2600063A (en) * 1951-02-20 1952-06-10 Leon S Maloof Visual electron flow indicator
US3174072A (en) * 1961-03-16 1965-03-16 Motorola Inc Recording level indicator and circuit

Also Published As

Publication number Publication date
NL57947C (US07714131-20100511-C00038.png)
CH203784A (de) 1939-03-31
FR807964A (fr) 1937-01-26
NL46087C (US07714131-20100511-C00038.png)
DE692964C (de) 1940-06-29
GB481791A (en) 1938-03-16
GB481790A (en) 1938-03-16

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