US1994726A - Tuning indicator tube - Google Patents

Tuning indicator tube Download PDF

Info

Publication number
US1994726A
US1994726A US737167A US73716734A US1994726A US 1994726 A US1994726 A US 1994726A US 737167 A US737167 A US 737167A US 73716734 A US73716734 A US 73716734A US 1994726 A US1994726 A US 1994726A
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
US737167A
Other languages
English (en)
Inventor
Orth Richard Tempel
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 NL46734D priority Critical patent/NL46734C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US737167A priority patent/US1994726A/en
Application granted granted Critical
Publication of US1994726A publication Critical patent/US1994726A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/12—Electrically-operated arrangements for indicating correct tuning
    • H03J3/14—Visual indication, e.g. magic eye
    • 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
    • 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
    • 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 5 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 Browder J. Thompson, Serial No. 736,833, filed July 25, 1934 and assigned to the same assignee as the present invention.
  • Such a device useful as a tuning indicator comprises an envelope having a straight indirectly heated equipotential cathode, a variable pitch grid concentric with and surrounding the cathode and a mesh anode coated with fluorescent material concentric with and surrounding the cathode and grid.
  • 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 to resonance.
  • Figure 1 is a perspective view, with parts broken away, of an electron discharge device made in accordance with my invention
  • Figure 2 is a horizontal section taken along line 2-2 of Figure 1
  • 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.
  • the electron discharge device or tuning indicator tube shown in Figure 1 comprises an evacuated envelope 10 provided with the usual stem and press 11 and base 12. Supported from the press are a cathode 13, preferably the conventional indirectly heated unipotential type, and a grid 14 concentric and preferably coextensive with and surrounding the cathode, the pitch between the turns varying preferably from one end of the grid to the other and shown in this particular embodiment with the greatest pitch at the bottom of the grid.
  • I position concentric and preferably coextensive with and surrounding the cathode and grid a solid sheet anode 15 provided with a 1ongitudinal opening 16 parallel to the cathode 13.
  • an auxiliary rod anode 17 Positioned in registry with this longitudinal opening and substantially coextensive with the cathode 13 is an auxiliary rod anode 17 having a coating fluorescent under electron bombardment and to which in normal operation is applied a positive voltage with respect to the grid and cathode. Electrons emitted from the cathode and striking the auxiliary anode with sufficient velocity cause it to fluoresce.
  • the electrons travel radially outward from the cathode and some pass by the auxiliary rod anode 17 in the space between the rod anode and the sides of the longitudinal opening 16 in the cylindrical anode 15. Due to the fact that this auxiliary anode has a positive voltage applied to it, electrons traveling to the wall of the envelope or bulb are drawn back with sufiicient velocity to strike the surface of the rod anode facing the envelope wall to cause it to fiuoresce so that the rod is fluorescent over its entire surface, giving a brilliant glow visible from the exterior of the envelope.
  • This luminosity can be increased by increasing the positive potential on the rod anode with respect to the cylindrical anode 15, since this causes not only a greater concentration of the electrons on the rod anode but also increases the velocity with which the electrons strike the rod anode.
  • the transformer 20 which may be a radio frequency or an intermediate frequency transformer and may be coupled to preceding stages, has its secondary tuned by means of variable condenser 21.
  • the alternating voltage whichappears across the terminals of condenser 21 and the secondary of transformer 20 when tuned to an incoming signal is applied between plate 22 and cathode 23 of a diode detector or rectifier 24, the rectified current resulting in a voltage drop across 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 lay-passing condenser 26.
  • the voltage drop across the 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 resistor 25.
  • the anode 15 and auxiliary rod anode 17 which may be connected together are connected to a positive potential with respect to the grid and cathode. It is possible to use the tube as a combined triode and tuning indicator tube if proper connections are made to the anode 15 and auxiliary rod anode 17.
  • An electron discharge device having an envelope, a straight cathode within said envelope for emitting electrons, a solid sheet electrode surrounding said cathode and having a longitudinal opening parallel to said cathode, a straight electrode coated with fluorescent material positioned in registry with said opening, and a variable pitch grid positioned between said cathode and said straight electrode for decreasing progressively and lengthwise of the cathode the electron flow from the cathode to said straight electrode when a progressively varying voltage is applied to the grid.
  • An electron discharge device having an envelope, a straight cathode within said envelope for emitting electrons, an electrode surrounding said cathode and having a longitudinal opening parallel to said cathode, a straight anode coated with fluorescent material positioned in registry with said opening for receiving electrons emitted by said cathode with suificient velocity to cause said anode to fluoresce and a control electrode between said cathode and straight anode for determining the portion of said straight anode to receive said electrons.
  • An electron discharge device having an envelope, a straight thermionic cathode within said envelope for emitting electrons, a cylindrical electrode surrounding said cathode and having a longitudinal opening parallel to said cathode, a straight rod anode coated with fluorescent material positioned in registry with the opening in said cylindrical anode and a variable pitch control grid comprising a helical coil surrounding said cathode, the pitch between the turns of said helical cell being progressively increased from one end of the grid to the other.
  • An electron discharge device having a thermionic cathode for emitting electrons, a cylindrical elecrode surrounding said cathode and having a longitudinal opening parallel to said cathode, a straight rod anode positioned opposite said longitudinal opening and coated with a fluorescent material and a variable pitch control grid positioned between said cathode and said rod anode for determining the length of the portion of said rod anode to receive electrons from said cathode.
  • An electron discharge device having an envelope, a straight thermionic cathode within said envelope for emitting electrons, a cylindrical electrode surrounding said cathode and having a longitudinal opening parallel to said cathode, a straight rod anode coated with fluorescent material positioned in registry with said opening for receiving electrons from said cathode with suflicient velocity to fiuoresce and electrically connected with said cylindrical anode and a control grid concentric with and surrounding said cathode and comprising a helical coil the pitch between the turns of which are progressively increased from one end of the grid to the other, said control grid decreasing progressively and lengthwise of the cathode the electron flow from said cathode to said rod anode when a progressively varying voltage is applied to the control grid whereby the length of the luminous portion of said anode is determined.

Landscapes

  • Discharge Lamp (AREA)
US737167A 1934-07-27 1934-07-27 Tuning indicator tube Expired - Lifetime US1994726A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL46734D NL46734C (xx) 1934-07-27
US737167A US1994726A (en) 1934-07-27 1934-07-27 Tuning indicator tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US737167A US1994726A (en) 1934-07-27 1934-07-27 Tuning indicator tube

Publications (1)

Publication Number Publication Date
US1994726A true US1994726A (en) 1935-03-19

Family

ID=24962843

Family Applications (1)

Application Number Title Priority Date Filing Date
US737167A Expired - Lifetime US1994726A (en) 1934-07-27 1934-07-27 Tuning indicator tube

Country Status (2)

Country Link
US (1) US1994726A (xx)
NL (1) NL46734C (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US2640093A (en) * 1949-12-22 1953-05-26 Rca Corp High voltage measuring device
US2648795A (en) * 1951-08-09 1953-08-11 Lee Electronic Labs Inc Visual electron flow indicator
US2736834A (en) * 1951-08-10 1956-02-28 Hartford Nat Bank & Trust Co Electron discharge tube comprising a luminescent screen
US2802128A (en) * 1952-06-21 1957-08-06 Int Standard Electric Corp Tuning indicator valve
US2820169A (en) * 1955-03-14 1958-01-14 Rca Corp Combination beam plate and outer shield
US4902933A (en) * 1988-09-20 1990-02-20 General Electric Company High efficacy discharge lamp having large anodes

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594026A (en) * 1949-09-09 1952-04-22 Siemens Ag Electron tube with luminescent shield, especially tuning tube
US2594025A (en) * 1949-09-09 1952-04-22 Siemens Ag Electron tube with luminescent shield, especially tuning tube
US2639398A (en) * 1949-09-09 1953-05-19 Siemens Ag Electronic tuning or indicating tube
US2640093A (en) * 1949-12-22 1953-05-26 Rca Corp High voltage measuring device
US2600063A (en) * 1951-02-20 1952-06-10 Leon S Maloof Visual electron flow indicator
US2648795A (en) * 1951-08-09 1953-08-11 Lee Electronic Labs Inc Visual electron flow indicator
US2736834A (en) * 1951-08-10 1956-02-28 Hartford Nat Bank & Trust Co Electron discharge tube comprising a luminescent screen
US2802128A (en) * 1952-06-21 1957-08-06 Int Standard Electric Corp Tuning indicator valve
US2820169A (en) * 1955-03-14 1958-01-14 Rca Corp Combination beam plate and outer shield
US4902933A (en) * 1988-09-20 1990-02-20 General Electric Company High efficacy discharge lamp having large anodes

Also Published As

Publication number Publication date
NL46734C (xx)

Similar Documents

Publication Publication Date Title
US2130162A (en) Tuning indicator tube
US1994726A (en) Tuning indicator tube
US1994733A (en) Tuning indicator tube
US2051188A (en) Tuning indicator tube
US2418844A (en) Ultra high frequency tube
US2175700A (en) Electronic indicating device
US2479964A (en) Glow-discharge lamp tuning indicator
US2108880A (en) Electric discharge tube
US2206954A (en) Electron discharge device
US2146016A (en) Electron discharge device
US2122268A (en) Tuning indicator tube
US2243034A (en) Fluorescent indicating device
US2191903A (en) Electron discharge device
US2103022A (en) Gaseous discharge tube
US2113669A (en) Tuning indicator tube
US2122267A (en) Tuning indicator circuits
US2122269A (en) Tuning indicator tube
US2015327A (en) Electron discharge device
US2105818A (en) Voltage indicating electron discharge tube
US2051189A (en) Tuning indicator tube
US2730640A (en) Secondary electron emitting system
US2132216A (en) Tuning indicator tube
US2124740A (en) Electronic indicating device
US2465041A (en) Electron discharge device
US2145356A (en) Heterodyne receiver