GB841083A - Improvements in or relating to travelling wave tubes - Google Patents
Improvements in or relating to travelling wave tubesInfo
- Publication number
- GB841083A GB841083A GB3448757A GB3448757A GB841083A GB 841083 A GB841083 A GB 841083A GB 3448757 A GB3448757 A GB 3448757A GB 3448757 A GB3448757 A GB 3448757A GB 841083 A GB841083 A GB 841083A
- Authority
- GB
- United Kingdom
- Prior art keywords
- envelope
- glass
- mandrel
- sleeve
- internal surface
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
- H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
- H01J25/38—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field the forward travelling wave being utilised
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/04—Re-forming tubes or rods
- C03B23/07—Re-forming tubes or rods by blowing, e.g. for making electric bulbs
- C03B23/073—Vacuum-blowing
- C03B23/076—Shrinking the glass tube on to a mandrel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Microwave Tubes (AREA)
Abstract
841,083. Travelling-wave tubes. M-O VALVE CO. Ltd., DIX, C. H., JENKINS, R. O., and RUSSELL, C. R. Nov. 19, 1958 [Nov. 5, 1957], No. 34487/57. Class 39(1). [Also in Group XXIII] In a travelling wave tube an electron gun and an elongated wire helix are accurately aligned by means of members which bear on accurately formed parts of the internal surface of the glass envelope. The relative portion of the envelope is formed by shrinking an oversize envelope on to a metal mandrel by locally heating the envelope and constraining the softened glass into contact with the mandrel, e.g. by reason of a difference in gas pressure between the inside and outside of the envelope. The metal mandrel has a higher coefficient of thermal expansion than the glass envelope so that upon cooling, the mandrel may be easily withdrawn from the envelope. The local heating may be effected by means of a gas ring- burner which is moved slowly down the outside of the envelope from a closed end to the end at which the envelope has previously been evacuated, but prior to this the envelope and mandrel may be together heated to a temperature just below the temperature at which the glass softens to relieve stresses in the envelope. As shown, the helix is supported by means of tantalum members 21, 22, spaced apart by 3 ceramic rods 23. In the region of molybdenum clip 24 the rods 23 are coated with a graphite composition to prevent unwanted oscillations during operation of the tube. The electron gun is of the kind described in Specification 841,083 and includes 3 titanium discs 25 spaced apart by 3 ceramic rods 26 which bear on the internal surface of the envelope. Electrode leads 29 are sealed through a glass disc 31 formed integrally with the pumping stem 32. The collector electrode comprises a copper block 7 secured to a molybdenum sleeve 33 and connected to the glass envelope by means of a sleeve 20 of nickel iron cobalt alloy. The external surface of the glass envelope may be accurately ground so as to have a prescribed spatial relationship with respect to the internal surface so that a magnetic focussing coil may be mounted thereon, accurate locating being achieved with the aid of a groove formed in sleeve 20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3448757A GB841083A (en) | 1957-11-05 | 1957-11-05 | Improvements in or relating to travelling wave tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3448757A GB841083A (en) | 1957-11-05 | 1957-11-05 | Improvements in or relating to travelling wave tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB841083A true GB841083A (en) | 1960-07-13 |
Family
ID=10366251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3448757A Expired GB841083A (en) | 1957-11-05 | 1957-11-05 | Improvements in or relating to travelling wave tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB841083A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2431764A1 (en) * | 1978-07-20 | 1980-02-15 | Philips Nv | CATHODE RAY TUBE AND MANUFACTURING METHOD THEREOF |
| FR2431766A1 (en) * | 1978-07-20 | 1980-02-15 | Philips Nv | TELEVISION SHOOTING TUBE |
-
1957
- 1957-11-05 GB GB3448757A patent/GB841083A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2431764A1 (en) * | 1978-07-20 | 1980-02-15 | Philips Nv | CATHODE RAY TUBE AND MANUFACTURING METHOD THEREOF |
| FR2431766A1 (en) * | 1978-07-20 | 1980-02-15 | Philips Nv | TELEVISION SHOOTING TUBE |
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