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ES437333A1 - Lens-grid system for electron tubes - Google Patents

Lens-grid system for electron tubes

Info

Publication number
ES437333A1
ES437333A1 ES437333A ES437333A ES437333A1 ES 437333 A1 ES437333 A1 ES 437333A1 ES 437333 A ES437333 A ES 437333A ES 437333 A ES437333 A ES 437333A ES 437333 A1 ES437333 A1 ES 437333A1
Authority
ES
Spain
Prior art keywords
anode
voltage
cathode
control
control electrode
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
ES437333A
Other languages
Spanish (es)
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.)
General Electric Co
Original Assignee
General Electric Co
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
Application filed by General Electric Co filed Critical General Electric Co
Publication of ES437333A1 publication Critical patent/ES437333A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/52—Target size or shape; Direction of electron beam, e.g. in tubes with one anode and more than one cathode
    • 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
    • H01J35/045—Electrodes for controlling the current of the cathode ray, e.g. control grids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
    • H01J35/147—Spot size control

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • X-Ray Techniques (AREA)

Abstract

An electron tube such as an x-ray tube has an anode target spaced from an electron beam emitting structure which include a cathode, focusing electrode and a control electrode. The control electrode surface nearest the anode is contoured to conform with selected equipotential values in the electrostatic field between the cathode and anode which equipotential is a predetermined percentage of the total cathode to anode voltage. When the control electrode is operated at a corresponding positive potential, the electrons follow certain trajectories and focus on the anode. Means are provided for varying the control voltage through a range from beam cut-off voltage to various positive voltages that permit control of the focal spot size regardless of the selected beam current and selected anode voltage.
ES437333A 1974-05-03 1975-04-30 Lens-grid system for electron tubes Expired ES437333A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US466728A US3916202A (en) 1974-05-03 1974-05-03 Lens-grid system for electron tubes

Publications (1)

Publication Number Publication Date
ES437333A1 true ES437333A1 (en) 1977-10-01

Family

ID=23852871

Family Applications (1)

Application Number Title Priority Date Filing Date
ES437333A Expired ES437333A1 (en) 1974-05-03 1975-04-30 Lens-grid system for electron tubes

Country Status (8)

Country Link
US (1) US3916202A (en)
BE (1) BE828673A (en)
CA (1) CA1034181A (en)
CH (1) CH614313A5 (en)
DE (1) DE2518688C2 (en)
ES (1) ES437333A1 (en)
FR (1) FR2286499A1 (en)
IT (1) IT1037741B (en)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5496985A (en) * 1978-01-18 1979-07-31 Toshiba Corp X-ray tube
US4334153A (en) * 1980-09-29 1982-06-08 General Electric Company X-Ray tube grid bias supply
DE3107949A1 (en) * 1981-03-02 1982-09-16 Siemens AG, 1000 Berlin und 8000 München X-RAY TUBES
FR2513061A1 (en) * 1981-06-12 1983-03-18 Thomson Csf X-RAY TUBE MULTIPLE CATHODE POLARIZATION DEVICE AND RADIOGENIC SOURCE COMPRISING SUCH A DEVICE
US4689809A (en) * 1982-11-23 1987-08-25 Elscint, Inc. X-ray tube having an adjustable focal spot
US4764947A (en) * 1985-12-04 1988-08-16 The Machlett Laboratories, Incorporated Cathode focusing arrangement
US4825123A (en) * 1986-12-31 1989-04-25 General Electric Company Two-piece cathode cup
US4868842A (en) * 1987-03-19 1989-09-19 Siemens Medical Systems, Inc. Cathode cup improvement
FR2633775B1 (en) * 1988-07-01 1995-11-17 Gen Electric Cgr RADIOGENIC TUBE WITH FLAT CATHODE AND INDIRECT HEATING
US5543625A (en) * 1994-05-20 1996-08-06 Finnigan Corporation Filament assembly for mass spectrometer ion sources
US5623530A (en) * 1996-09-17 1997-04-22 General Electric Company Cathode cup assembly for an x-ray tube
US6438207B1 (en) 1999-09-14 2002-08-20 Varian Medical Systems, Inc. X-ray tube having improved focal spot control
US6888922B2 (en) * 2001-10-18 2005-05-03 Ge Medical Systems Global Technology Co., Llc Filament circuit resistance adjusting apparatus technical field
EP1449231B1 (en) * 2001-11-20 2010-06-23 Koninklijke Philips Electronics N.V. X-ray tube cathode cup structure for focal spot deflection
US20030095632A1 (en) 2001-11-20 2003-05-22 Philips Medical Systems (Cleveland), Inc. X-ray tube cathode cup structure for focal spot deflection
US7257194B2 (en) * 2004-02-09 2007-08-14 Varian Medical Systems Technologies, Inc. Cathode head with focal spot control
WO2007135614A1 (en) * 2006-05-22 2007-11-29 Philips Intellectual Property & Standards Gmbh X-ray tube whose electron beam is manipulated synchronously with the rotational anode movement
US8498380B2 (en) * 2008-11-26 2013-07-30 Koninklijke Philips N.V. Auxiliary grid electrode for X-ray tubes
US8134290B2 (en) 2009-04-30 2012-03-13 Scientific Instrument Services, Inc. Emission filaments made from a rhenium alloy and method of manufacturing thereof
US9524845B2 (en) 2012-01-18 2016-12-20 Varian Medical Systems, Inc. X-ray tube cathode with magnetic electron beam steering
JP6223973B2 (en) * 2012-07-02 2017-11-01 東芝電子管デバイス株式会社 X-ray tube
US10032595B2 (en) * 2016-02-29 2018-07-24 General Electric Company Robust electrode with septum rod for biased X-ray tube cathode
CN106158563B (en) * 2016-08-31 2018-05-22 成都凯赛尔电子有限公司 A kind of spiral cathode focus method of 2.5mm focuses
RU168725U1 (en) * 2016-09-09 2017-02-17 Общество с ограниченной ответственностью Совместное русско-французское предприятие "СпектрАп" X-RAY DIAGNOSTIC TUBE
CN110676144B (en) * 2019-09-17 2022-01-21 中国科学院国家空间科学中心 Cathode structure of X-ray tube
US12046441B2 (en) * 2021-12-21 2024-07-23 GE Precision Healthcare LLC X-ray tube cathode focusing element

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1203495A (en) * 1913-05-09 1916-10-31 Gen Electric Vacuum-tube.
DE367707C (en) * 1920-05-16 1923-01-25 C H F Mueller Roentgenroehrenf Incandescent cathode x-ray tubes for generating sharp x-ray images
US2053792A (en) * 1933-07-19 1936-09-08 Henry K Huppert X-ray generator
US2173165A (en) * 1936-05-16 1939-09-19 Rca Corp Electron tube
US2215426A (en) * 1939-04-07 1940-09-17 Machlett Lab Inc X-ray tube
US2308800A (en) * 1941-02-15 1943-01-19 Bell Telephone Labor Inc Electron discharge device
US2518472A (en) * 1949-02-03 1950-08-15 Heil Oskar Electron gun
GB701050A (en) * 1950-03-22 1953-12-16 Werner Ehrenberg Improvements in or relating to x-ray tubes
US2665384A (en) * 1950-07-18 1954-01-05 Hubert P Yockey Ion accelerating and focusing system
DE903017C (en) * 1951-01-31 1954-02-01 Sueddeutsche Lab G M B H Manufacture of small balls from high-fusible materials
US3141993A (en) * 1959-12-24 1964-07-21 Zeiss Jena Veb Carl Very fine beam electron gun
US3452241A (en) * 1966-09-06 1969-06-24 Rca Corp Electron gun suitable for electron microscope

Also Published As

Publication number Publication date
CA1034181A (en) 1978-07-04
IT1037741B (en) 1979-11-20
FR2286499A1 (en) 1976-04-23
DE2518688C2 (en) 1987-01-29
US3916202A (en) 1975-10-28
CH614313A5 (en) 1979-11-15
BE828673A (en) 1975-09-01
DE2518688A1 (en) 1975-11-13
FR2286499B1 (en) 1982-08-20

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19980202