US1980341A - Vacuum tube grid construction - Google Patents
Vacuum tube grid construction Download PDFInfo
- Publication number
- US1980341A US1980341A US530262A US53026231A US1980341A US 1980341 A US1980341 A US 1980341A US 530262 A US530262 A US 530262A US 53026231 A US53026231 A US 53026231A US 1980341 A US1980341 A US 1980341A
- Authority
- US
- United States
- Prior art keywords
- rod
- vacuum tube
- grid
- press
- grid construction
- 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
Links
- 238000010276 construction Methods 0.000 title description 5
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
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- 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
- H01J2893/0002—Construction arrangements of electrode systems
Description
Nov. 13, 1934. c. J. KAYKO ET AL VACUUM TUBE GRID CONSTRUCTION Filed April 15 Armmvsr's v i i a WITNESS Patented Nov. 13, 1934 UNITED STATES VACUUM TUBE can) CONSTRUCTION Charles J. Kayko and Paul A. Stoll, Jackson, Mich., assignors to The Sparks-Withington Company, Jackson, Mich., a corporation of Ohio Application April 15, 1931, Serial No. 530,262
1 Claim.
, ploying cylindrical electrodes.
The grid electrode usually consists of fine wire wound in the form of a helix and having a single supporting rod contacting each turn of the helix. The natural requirement of a vacuum tube em- 10 ploying a grid electrode is that the wire forming the grid be of relatively small diameter so as to ofier little resistance to the electron flow between cathode and anode. However, the separate turns of fine wire forming the grid are subjected to mechanical vibration causing plate current modulation or what is commonly known as microphonic action.
It is, therefore, an object of this invention to provide a grid structure for a vacuum tube of comparatively fine wire that will not produce microphonic action.
It is a further object of this invention to produce a grid structure employing only one supporting member, but utilizing additional means for increasing the rigidity of the grid assembly.
Other objects and advantages relate to details of the structure, and will be apparent from the following description, taken in connection with the accompanying drawing in which:-
Figure 1 is a perspective view of a vacuum tube electrode assembly embodying our invention.
Figure 2 is an elevation view of a tube having a portion of the envelope broken away to show the electrodes.
Figure 3 is a sectional view taken along line 33 of Figure 2.
Figure 4 is an elevation view of the grid assembly of our invention.
A conventional heater type vacuum tube 1 is illustrated in Figure 2 having a base 2 and a press 4 for supporting the electrodes. The electrodes are shown to a better advantage in Figure 1. Rising from press 4 are a plurality of rods which serve as supports for the concentrically spaced electrodes as well as electrical connections to the same.
An insulating member 9 joins rods 5 and 8 at their free ends forming a frame-work for supporting and spacing the remaining electrodes. A rod 10 having its end portion bent parallel to the top of the press provides a support for the lower end of the heater type cathode 11. The upper end of cathode 11 is supported by rod 12 passing through insulator 9.
The cathode, in this instance, is shown comprising a metallic tube 13 provided with an electron-emitting coating 14. The ends of tube 13 are provided with insulating plugs 15 which support a heater element 16 subtended by rods 12 and 25. Electrical connections to the heater are made through rod 10 which is connected to rod 25 and through a cross rod 17 connecting rod 12 to rod 8. Connection to the cathode is made by means of a metallic strip 18 secured at one end to the electron-emitting surface 14 and at the other end to rod 19 sealed in the press.
In practice, we have found that rod 24 need be only from two to three times the diameter of grid wires 23. This construction produces a rigid assembly that is substantially free from mecham cal vibration during normal tube operation. This construction has enabled us to eliminate microphonic action due to plate current modulation set up by vibration of the grid electrode.
It is .to be understood that the foregoing disclosure is merely for the purpose of illustration, and that the invention may be broadly applied to different types of grid'structures, without departing from the spirit and scope of the appended claim.
We claim:
A vacuum tube structure comprising an evacuated bulb including a press, a plurality of metallic members held in said press two of which extend substantially the full length of said bulb and the remainder terminating a short distance from said press, an insulating member mounted upon the free ends of said long metallic members, a cathode and heater therefor positioned was bers, a grid electrode positioned between said 7 anode and cathode comprising a fine wire ,helix secured to a support rod extending beyond the ends thereof and having its lower end secured to another of said short metallic members and its upper end extending through said insulating member, and a second rod of smaller diameter disposed at substantially right angles to the turns of said helix and securedonly thereto for preventing microphonic action in the tube.
CHARLES J. KAYKO. PAUL A. STOLL.
I us) fies,
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US530262A US1980341A (en) | 1931-04-15 | 1931-04-15 | Vacuum tube grid construction |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US530262A US1980341A (en) | 1931-04-15 | 1931-04-15 | Vacuum tube grid construction |
Publications (1)
Publication Number | Publication Date |
---|---|
US1980341A true US1980341A (en) | 1934-11-13 |
Family
ID=24113015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US530262A Expired - Lifetime US1980341A (en) | 1931-04-15 | 1931-04-15 | Vacuum tube grid construction |
Country Status (1)
Country | Link |
---|---|
US (1) | US1980341A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2777083A (en) * | 1954-04-19 | 1957-01-08 | Chromatic Television Lab Inc | Electrode construction for cathoderay tubes |
-
1931
- 1931-04-15 US US530262A patent/US1980341A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2777083A (en) * | 1954-04-19 | 1957-01-08 | Chromatic Television Lab Inc | Electrode construction for cathoderay tubes |
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