GB402385A - Improvements in and relating to x-ray tubes - Google Patents

Improvements in and relating to x-ray tubes

Info

Publication number
GB402385A
GB402385A GB5559/32A GB555932A GB402385A GB 402385 A GB402385 A GB 402385A GB 5559/32 A GB5559/32 A GB 5559/32A GB 555932 A GB555932 A GB 555932A GB 402385 A GB402385 A GB 402385A
Authority
GB
United Kingdom
Prior art keywords
filaments
focal spot
separate
anticathode
feb
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
Application number
GB5559/32A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 US518050A priority Critical patent/US1923876A/en
Priority to FR732173D priority patent/FR732173A/en
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB5559/32A priority patent/GB402385A/en
Publication of GB402385A publication Critical patent/GB402385A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/06—Cathodes
    • H01J35/064—Details of the emitter, e.g. material or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/06—Cathodes
    • H01J35/066—Details of electron optical components, e.g. cathode cups
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/06—Cathode assembly
    • H01J2235/068—Multi-cathode assembly

Landscapes

  • X-Ray Techniques (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

402,385. Rontgen-ray tubes. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Hawkins, L. A. ; 1130, Wendell Avenue, Schenectady, New York, U.S.A.) Feb. 24, 1932, No. 5559. Void [Abridged as open to inspection under Sect. 91 of the Acts, Feb. 26, 1932]. [Class 39 (i).] To obtain a linear focal spot giving sharp focussing, electrons from two or more separate filaments are focussed on to adjacent or overlapping areas of the anticathode. If one filament burns out, the tube may still be used with an elliptical focal spot. One filament may give a larger focal spot than the other for independent use of the filaments. Two filaments 4, 5 in separate focussing cups 6, 7 are supplied with current from a transformer 8 or from separate transformers and give focal areas 11 as shown on the anticathode 2. Shields 9 protect the presses from heat and electrostatic strains. The filaments may be side by side in a single cup. Spiral or helical filaments may be used and the combined focal spot may have a length three times its width.
GB5559/32A 1931-02-25 1932-02-24 Improvements in and relating to x-ray tubes Expired GB402385A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US518050A US1923876A (en) 1931-02-25 1931-02-25 Means and method of producing an X-ray focus varying with the x-ray tube load
FR732173D FR732173A (en) 1931-02-25 1932-02-23 Chi ray generators improvements
GB5559/32A GB402385A (en) 1931-02-25 1932-02-24 Improvements in and relating to x-ray tubes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US518050A US1923876A (en) 1931-02-25 1931-02-25 Means and method of producing an X-ray focus varying with the x-ray tube load
GB5559/32A GB402385A (en) 1931-02-25 1932-02-24 Improvements in and relating to x-ray tubes

Publications (1)

Publication Number Publication Date
GB402385A true GB402385A (en) 1933-11-30

Family

ID=9798398

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5559/32A Expired GB402385A (en) 1931-02-25 1932-02-24 Improvements in and relating to x-ray tubes

Country Status (3)

Country Link
US (1) US1923876A (en)
FR (1) FR732173A (en)
GB (1) GB402385A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10872741B2 (en) 2016-06-20 2020-12-22 Canon Electron Tubes & Devices Co., Ltd. X-ray tube

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017533A (en) * 1956-05-08 1962-01-16 Rca Corp Auxiliary discharge gas amplifier and the like
US4685118A (en) * 1983-11-10 1987-08-04 Picker International, Inc. X-ray tube electron beam switching and biasing method and apparatus
US4764947A (en) * 1985-12-04 1988-08-16 The Machlett Laboratories, Incorporated Cathode focusing arrangement
FR2633774B1 (en) * 1988-07-01 1991-02-08 Gen Electric Cgr SELF-ADAPTED VARIABLE FIREPLACE X-RAY TUBE
FR2633773B1 (en) * 1988-07-01 1991-02-08 Gen Electric Cgr RADIOGENIC TUBE WITH SELF-LIMITING ELECTRONIC FLOW
US5007074A (en) * 1989-07-25 1991-04-09 Picker International, Inc. X-ray tube anode focusing by low voltage bias

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10872741B2 (en) 2016-06-20 2020-12-22 Canon Electron Tubes & Devices Co., Ltd. X-ray tube

Also Published As

Publication number Publication date
FR732173A (en) 1932-09-14
US1923876A (en) 1933-08-22

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