US3504220A - Cathode unit - Google Patents

Cathode unit Download PDF

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Publication number
US3504220A
US3504220A US667740A US3504220DA US3504220A US 3504220 A US3504220 A US 3504220A US 667740 A US667740 A US 667740A US 3504220D A US3504220D A US 3504220DA US 3504220 A US3504220 A US 3504220A
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United States
Prior art keywords
cathode
preheater
insulator
parts
cathode unit
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Expired - Lifetime
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US667740A
Inventor
Naum Aronovich Iofis
Irina Vasilievna Judinskaya
Leon Vladimirovich Traube
Vyacheslav Konstantinov Galkin
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.)
VYACHESLAV KONSTANTINOVICH GAL
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VYACHESLAV KONSTANTINOVICH GAL
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/04—Cathodes

Definitions

  • a cathode unit for electrical vacuum instruments comprises a cathode with a preheater in respective parts of a ceramic insulator which include projections and slots to define heat and current insulative gaps between the regions where the cathode and preheater are secured.
  • the present invention relates to cathode units used in electric vacuum instruments.
  • cathode units for electric vacuum instruments comprising a cathode, a preheater and an insulator wherein the cathode and the preheater are secured on one insulator (cf. Hungarian Patents Nos. 143,842 and 144,743).
  • a disadvantage of these constructions lies in current leakage in the cathode-preheater circuit which restricts the field of their application to only those instruments wherein the cathode is electrically connected to the preheater.
  • An object of the present invention is to eliminate these disadvantages.
  • Another object of the present invention is to provide a cathode unit for electronic instruments wherein current leakage in the preheater-cathode circuit is eliminated and insulator thermal conductivity is substantially reduced.
  • a cathode unit with a cathode and a preheater secured on an insulator wherein, according to the invention, a gap is provided between the areas intended for securing the cathode and the preheater on the insulator.
  • One of the possible embodiments of the invention is a cathode unit with an insulator made of two parts, one of which serves for securing the preheater, while the other serves for securing a cathode.
  • the insulator parts are provided with slots and projections which, when the insulator is assembled, form a gap between the parts. Said parts are connected beyond the cathode and preheater attachment areas prior to mounting the cathode and the preheater.
  • FIG. 1 is a sectional view of the cathode unit
  • FIGS. 2 and 3 show parts of the cathode unit insulator
  • FIG. 4 illustrates a cathode unit insulator assembly
  • the butt-type cathode unit consists of a cathode 1 (FIG. 1) and a preheater 2, secured in a ceramic insulator 3 made of two parts 4 and 5, the preheater 2 being secured in part 4 of a greater diameter, and the cathode 1 being secured in part 5 of a smaller diameter.
  • the parts are provided with respective slots 6 and projections 7 which, when assembled, form a gap 8 between the parts 4 and 5.
  • the attachment places of the parts 4 and 5 are outsidethe area intended for securing the cathode and the preheater in the insulator.
  • the parts are connected according to the well-known manufacturing method (by sintering) prior to assembling the cathode unit.
  • Such embodiment of the cathode unit ensures separation of the areas where the cathode 1 (FIG. 1) and the preheater 2 are secured.
  • a cathode unit for electric vacuum instruments comprising a cathode, a preheater, an insulator, means securing said cathode and preheater on said insulator in specific regions thereof, and means defining heat and current insulative gaps in said insulator in the regions where said cathode and said preheater are secured to said insulator.

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  • Electrodes For Cathode-Ray Tubes (AREA)

Description

March 31, 1970 N. A. lOFlS ETAL 3,504,220
QATHODE UNIT Filed Sept. 14, 1967 v United States Patent US. Cl. 313-270 3 Claims ABSTRACT OF THE DISCLOSURE A cathode unit for electrical vacuum instruments comprises a cathode with a preheater in respective parts of a ceramic insulator which include projections and slots to define heat and current insulative gaps between the regions where the cathode and preheater are secured.
The present invention relates to cathode units used in electric vacuum instruments.
There are known cathode units for electric vacuum instruments comprising a cathode, a preheater and an insulator wherein the cathode and the preheater are secured on one insulator (cf. Hungarian Patents Nos. 143,842 and 144,743).
A disadvantage of these constructions lies in current leakage in the cathode-preheater circuit which restricts the field of their application to only those instruments wherein the cathode is electrically connected to the preheater.
Another disadvantage of the known constructions of the above type when used ior electronic instruments is their high thermal conductivity.
An object of the present invention is to eliminate these disadvantages.
Another object of the present invention is to provide a cathode unit for electronic instruments wherein current leakage in the preheater-cathode circuit is eliminated and insulator thermal conductivity is substantially reduced.
These and other objects are achieved in a cathode unit with a cathode and a preheater secured on an insulator wherein, according to the invention, a gap is provided between the areas intended for securing the cathode and the preheater on the insulator.
One of the possible embodiments of the invention is a cathode unit with an insulator made of two parts, one of which serves for securing the preheater, while the other serves for securing a cathode. The insulator parts are provided with slots and projections which, when the insulator is assembled, form a gap between the parts. Said parts are connected beyond the cathode and preheater attachment areas prior to mounting the cathode and the preheater.
"ice
Hereinbelow is given a detailed description of an exemplary embodiment of a cathode unit according to the invention in conjunction with the accompanying drawing, wherein:
FIG. 1 is a sectional view of the cathode unit;
FIGS. 2 and 3 show parts of the cathode unit insulator; and
FIG. 4 illustrates a cathode unit insulator assembly.
The butt-type cathode unit consists of a cathode 1 (FIG. 1) and a preheater 2, secured in a ceramic insulator 3 made of two parts 4 and 5, the preheater 2 being secured in part 4 of a greater diameter, and the cathode 1 being secured in part 5 of a smaller diameter.
The parts are provided with respective slots 6 and projections 7 which, when assembled, form a gap 8 between the parts 4 and 5.
The attachment places of the parts 4 and 5 are outsidethe area intended for securing the cathode and the preheater in the insulator.
The parts are connected according to the well-known manufacturing method (by sintering) prior to assembling the cathode unit.
Such embodiment of the cathode unit ensures separation of the areas where the cathode 1 (FIG. 1) and the preheater 2 are secured.
What we claim is:
1. A cathode unit for electric vacuum instruments comprising a cathode, a preheater, an insulator, means securing said cathode and preheater on said insulator in specific regions thereof, and means defining heat and current insulative gaps in said insulator in the regions where said cathode and said preheater are secured to said insulator.
2. A cathode unit according to claim 1 in which the insulator comprises two parts respectively mounting said preheater and said cathode, said parts having respective projections and slots which constitute the means defining said gaps.
3. A cathode unit according to claim 2 wherein said cathode is engaged in said projections and said preheater is mounted within the cathode and secured in the part having the slots for receiving the projections.
References Cited UNITED STATES PATENTS 3,311,774 3/1967 Atti 3l3337 X JOHN W. HUCKERT, Primary Examiner R. F. POLISSACK, Assistant Examiner US. Cl. X.R.
US667740A 1967-09-14 1967-09-14 Cathode unit Expired - Lifetime US3504220A (en)

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US66774067A 1967-09-14 1967-09-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728574A (en) * 1971-10-19 1973-04-17 Gte Sylvania Inc Cathode cap
US5475281A (en) * 1991-02-25 1995-12-12 U.S. Philips Corporation Cathode

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311774A (en) * 1964-03-23 1967-03-28 Westinghouse Electric Corp Electron discharge device having a rotatable cathode therein

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311774A (en) * 1964-03-23 1967-03-28 Westinghouse Electric Corp Electron discharge device having a rotatable cathode therein

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728574A (en) * 1971-10-19 1973-04-17 Gte Sylvania Inc Cathode cap
US5475281A (en) * 1991-02-25 1995-12-12 U.S. Philips Corporation Cathode

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