EP0335780A1 - Spule, Herstellungsverfahren dieser Spule und Bildvorrichtung mit einer solchen Spule - Google Patents

Spule, Herstellungsverfahren dieser Spule und Bildvorrichtung mit einer solchen Spule Download PDF

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Publication number
EP0335780A1
EP0335780A1 EP89400825A EP89400825A EP0335780A1 EP 0335780 A1 EP0335780 A1 EP 0335780A1 EP 89400825 A EP89400825 A EP 89400825A EP 89400825 A EP89400825 A EP 89400825A EP 0335780 A1 EP0335780 A1 EP 0335780A1
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EP
European Patent Office
Prior art keywords
coil
support
coil according
patterns
deposited
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.)
Withdrawn
Application number
EP89400825A
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English (en)
French (fr)
Inventor
Jacques Beauzamy
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 CGR SA
Original Assignee
General Electric CGR SA
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 CGR SA filed Critical General Electric CGR SA
Publication of EP0335780A1 publication Critical patent/EP0335780A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/867—Means associated with the outside of the vessel for shielding, e.g. magnetic shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • 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
    • H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/003—Preventing or cancelling fields entering the enclosure

Definitions

  • the main object of the invention is a coil, a method for producing said coil and an imaging device comprising such a coil.
  • the invention particularly relates to the production of coils capable of compensating for the parasitic effects of a magnetic field on charged particles by generating a magnetic field at a desired location.
  • Electrode beams such as electrons. It is known to use electron beams in display devices such as, for example: image intensifier tubes, television cameras, cathode ray display tubes or electron microscopes.
  • Any visualization device is subjected, at least, to the earth's magnetic field.
  • the device according to the present invention compensates for the influence of the earth's magnetic field on the image formed by generating a magnetic field which is substantially of the same intensity as the disturbing magnetic field and of opposite polarization.
  • a coil comprising a support forming a plate of substantially constant thickness. On this support is deposited a conductor constituting the coil.
  • the coil according to the present invention is intended to be placed on the path of electromagnetic radiation, to display and / or display. To do this, it is imperative that the disturbance of the electromagnetic waves brought by the coil is in any case less than the annoyance presented by the distortions caused by the magnetic field.
  • the support is chosen so as to absorb as little as possible of electromagnetic radiation belonging to the bandwidth of the radiation to be viewed and / or viewed. In all cases, this absorption must be uniform over the entire surface of the coil intercepting said radiation.
  • the electromagnetic radiation belongs to the visible spectrum
  • use will advantageously be made of a glass or plexiglass support.
  • plastic materials will be used, for example.
  • a material sold under the brand KAPTON by the company DUPONT de NEMOURS is used.
  • the conductor tracks deposited on the support form patterns making it possible to generate, when traversed by an electric current, the desired magnetic field.
  • the absorption due to the patterns of conductors is negligible, the conductor, in view of the thickness of the tracks used, which can be considered transparent.
  • transparent light conductors are used, such as, for example, those used in certain photovoltaic panels or in transparent calculators.
  • the electromagnetic radiation belongs to X-rays, beryllium, or aluminum deposited in a thin layer, or plastic conductors is used, for example.
  • a uniform layer of conductors is deposited, to the resolution of the display device.
  • conductive tracks are formed by making cuts, for example by chemical ablation, in the uniform surface of the conductor. Such cuts will delimit conductive tracks. These cuts, however, are too fine to have a detectable influence on the image formed.
  • the coil according to the present invention with other means to limit the effects of parasitic magnetic fields.
  • the faces of the imaging device which do not have to allow electromagnetic radiation to pass are covered with a shield which channels the magnetic field lines.
  • the present invention aims to solve the problem posed by magnetic fields on charged particles.
  • the problem is solved by using a coil comprising a support and at least one electrical conductor, characterized in that the support is a plate of substantially constant thickness and that the conductor is deposited on the support so as to have an absorption of electromagnetic waves in a predetermined frequency band constant over almost the entire surface of the coil.
  • the coil 2 of FIG. 1 comprises a support 3 constituted by a plate, the two main faces of which are substantially equidistant over the entire surface of the coil.
  • the plate 3 having to absorb as little as possible of electromagnetic radiation in a predetermined bandwidth, is advantageously made of a dielectric material.
  • the dielectric material is adapted to the chosen bandwidth.
  • the plate 3 is not necessarily flat. It can for example conform to the input and / or output face of a display device to which it is adapted. Mention may be made, by way of nonlimiting example, of spherical, elliptical or hyperbolic caps.
  • a first pattern 12 of conductive tracks 1 On a first face of the support 3 is deposited a first pattern 12 of conductive tracks 1. The flow of current in the tracks 1 ensures the generation of the desired magnetic field.
  • the delimitation between the tracks 1 of the pattern 12 is constituted by grooves of small width compared to the resolution of the imaging device. In such a case, it is sufficient to ensure the return of current to obtain a complete coil. This return of the current can be carried out on the same face as the pattern 12 or on the opposite face.
  • At least one second pattern 13 is used, complementary to the first pattern 12.
  • the pattern 13 consisting of the conductive tracks 10 is deposited on the second face of the support 3 of the coil 2.
  • the tracks 10 of the pattern 13 are complementary to the tracks 1 and of the pattern 12, that is to say that on the path of the radiations electromagnetic patterns 10 fill the spaces left free by tracks 1.
  • Tracks 1 and tracks 10 are interconnected, in at least one point through a junction 11 made in the support 3.
  • the number of interconnections depends on the geometry of the patterns 12 and 13. Insofar as it is not possible to place the interconnections outside the area of image formation, it is important to take care that the interconnections 11 absorb the electromagnetic radiation as little as possible.
  • the interconnection 11 is located in the center of a coil 2, for example circular.
  • the patterns 12 and 13 have tracks 1 and 10 so as to obtain the desired magnetic field. In all cases, it is imperative that the fields produced by the tracks 1 of the pattern 12 are added to the field generated by the tracks 10 of the pattern 13.
  • the patterns 12 and 13 include concentric arcs and / or square spirals .
  • the patterns 12 and 13 comprise spirals, for example logarithmic.
  • the coil 2 of FIG. 1 is advantageously produced in known technologies in the production of double-sided printed circuits. In such technologies, it is known to have precision on the order of a tenth of a millimeter. Such details will often be sufficient for light amplifiers used in radiology comprising a coil 2 according to the present invention. If higher details are desired, it is important to take the greatest care in producing the printed circuit.
  • a deposition of the tracks 1 and 10 of the patterns 12 and 13 is carried out, the support 3 being flat, then if necessary it is given the desired shape.
  • flexible printed circuit supports such as, for example, the material sold under the KAPTON brand by the DUPONT de NEMOURS company.
  • an exemplary embodiment of coils 2 according to the present invention can be seen comprising at least two patterns 12 and 13 deposited on the same face of the support 3.
  • an insulating layer 14 must be interposed between the patterns 12 and 13.
  • the layer 14 is for example an insulating varnish. It is understood that one can use more than two layers on the face of the support 3 used. Likewise, the fact of using a plurality of layers on one of the faces does not prevent the use of the second face for depositing complementary patterns.
  • the interconnection 11 between the patterns 12 and the patterns 13 is achieved by an absence of deposition of the insulating material 14 at the location where the interconnection is desired.
  • the track for example 10 of the pattern 13 only touches the edges of the area not insulated by the material 14, the track 1 of the pattern 13. In this case, the formation of an extra thickness is avoided. ensuring electrical continuity.
  • FIG. 3 one can see an embodiment of a coil 2 according to the present invention comprising two patterns 12 and 13 deposited on the same face of the support 3 electrically insulated by a varnish 14.
  • the connection 11 placed at the level of the axis 15 of the coil 2 is produced by touching the track 10 and the track 1 without excess thickness on the path of the electromagnetic rays parallel to the axis 15.
  • only two patterns 12 and 13 are represented and it is good understood that the use of more patterns deposited on one and / or the other face of the support 3 does not depart from the scope of the present invention.
  • the coil illustrated in FIG. 3 is advantageously produced by screen printing technologies using conductive ink.
  • FIG. 5 one can see an example of patterns 12 capable of being deposited on the coil 2 according to the present invention.
  • the pattern 12 is a spiral connecting the center of the coil 2 to the edge. In the center, there is a connection 11 with a complementary pattern 13 deposited on, for example the other face of the coil 2.
  • the spiral has substantially the same width from the center to the edge of the coil 2.
  • the width of the spiral varies over the surface of the coil 2.
  • the thickness of the spiral increases from the center to the edge of the box.
  • the two limits of the spiral delimiting the pattern 12 are themselves spirals.
  • FIG. 6 we can see a section of an image intensifier tube, applicable for example in medical or industrial radiology comprising a coil 2 according to the present invention.
  • Image intensifier tubes in radiology are known as such and have been described, for example, in the "THOMSON-CSF technical review", Volume 8 number 4 of December 1976.
  • Such a tube includes for example a screen input 5 capable of converting X-rays into photons 10, for example having passed through an object 110 to be radiographed.
  • a photocathode 1 capable of converting the X photons into electrons.
  • the electrons can be accelerated and guided for example three electrodes 6 and the anode 9 towards the observation screen 300, the observation screen 300 ensures the conversion of the electrons 15 into visible light.
  • the image intensifier tube further comprises a voltage generator 130 making it possible to supply the various electrodes via cables 14 and polarization resistors 120.
  • a magnetic shield 200 was first placed around the image intensifier tube. However, this shield is absent from the entry and exit face of the tube so as not to interfere how it works.
  • the tube according to the present invention further comprises a coil 2 according to the invention capable of generating a magnetic field which, to cancel the effect of the Earth's magnetic field should have the same amplitude and an opposite polarization.
  • a detector 18 is used to determine the value of the earth's magnetic field.
  • the detector 18 is for example a HALL effect probe.
  • the detector 18 is placed in the axis of the image intensifier tube behind the observation screen 300.
  • sufficient space is left between the screen 300 and the probe 18 to allow observation or recording of the screen 300. In this case, the probe is placed behind the observer or the recording device. This arrangement has the advantage of measuring the axial field generating distortion without hampering the operation of the image intensifier tube.
  • one or more pairs of detectors 18 are used which are placed symmetrically around the coil 2. Such detectors 18 are connected to a control device 170 which cancels the magnetic field measured by the detectors. These magnetic fields measured by the detectors 18 correspond to the sum of the disturbing magnetic field and the magnetic field generated by the coil 2. Compensation is thus carried out.
  • the detectors 18 are used in pairs. Thus, it is possible to carry out mounting in opposition making it possible to eliminate by subtraction the variations of the output signal of the detectors 18 as a function of the temperature.
  • the detector 18 is connected to the coil 2 surrounding the image intensifier tube, for example by means of a control device 170 which converts the input signal generated by the detector 18 to a current supplied to the coil 2.
  • the control device 170 is for example an amplifier, or a servo device.
  • a flat coil 2 is used as illustrated in FIG. 6.
  • the coil illustrated in FIG. 4 is used, adapted to the shape of the screen 5.
  • FIG. 7 we can see a first embodiment of a television camera according to the present invention.
  • FIG. 7 is schematically represented a television camera of the vidicon type, it being understood that other types of cameras do not depart from the scope of the present invention.
  • the television camera 4 includes a lens 50 allowing the formation of images on a photosensitive device 100.
  • the photosensitive device 100 is composed for example of a transparent signal plate connected to a photoconductive layer.
  • the detector 100 is scanned by the electron beam emitted by a cathode 36.
  • the electron beam passes first through a wehnelt 35 then through three concentration electrodes 34, 33 and 32.
  • At the outlet of electrodes 32 is placed a deceleration grid 39.
  • the camera further comprises an electron concentration collar 31 as well as a deflection coil.
  • the image formed is present on an output 37 connected to the device 100.
  • the device 100 is connected to the ground 19 by a resistor 38.
  • a coil 2 according to the invention has been placed behind the objective 50, as close as possible to the vacuum enclosure 135 of the camera tube 4.
  • a coil 2 according to the present invention transparent to the light to which the camera 4 is sensitive, such as for example visible light, infrared and / or ultraviolet.
  • the return of the current is for example ensured by the grounding 19 of one of the terminals of the coil 2.
  • each coil is supplied by its own control circuit or amplifier 17. All the control devices or amplifiers 17 are connected to the output of a device magnetic field detection 18.
  • the magnetic field detection device 18 is for example a HALL effect probe.
  • the magnetic field detector is advantageously placed in the axis of the electron beam when no deviation is applied to it.
  • the magnetic field detector 18 is placed behind the cathode 36. This arrangement is particularly advantageous since it does not hinder the propagation of the photons forming the image nor that of the scanning electrons. .
  • the image intensifier it is possible to use one or more pairs of detectors 18 placed at the level of the coil 2 so as, for example, to obtain a zero resulting field corresponding to the cancellation of the stray field by the field generated by the coil 2.
  • the present invention applies to the manufacture of two-dimensional electric coils, such as for example flat coils or coils in the form of a spherical cap.
  • Such coils find their applications in particular in compensation for the influence of magnetic fields on beams of charged particles. They find their application in particular in imaging devices using electron beams.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Measurement Of Radiation (AREA)
  • X-Ray Techniques (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
EP89400825A 1988-03-29 1989-03-23 Spule, Herstellungsverfahren dieser Spule und Bildvorrichtung mit einer solchen Spule Withdrawn EP0335780A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8804072 1988-03-29
FR8804072A FR2629628B1 (fr) 1988-03-29 1988-03-29 Bobine, procede de realisation de ladite bobine et dispositif d'imagerie comportant une telle bobine

Publications (1)

Publication Number Publication Date
EP0335780A1 true EP0335780A1 (de) 1989-10-04

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EP89400825A Withdrawn EP0335780A1 (de) 1988-03-29 1989-03-23 Spule, Herstellungsverfahren dieser Spule und Bildvorrichtung mit einer solchen Spule

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US (1) US5032764A (de)
EP (1) EP0335780A1 (de)
JP (1) JPH01298705A (de)
FR (1) FR2629628B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007134135A (ja) * 2005-11-09 2007-05-31 Toshiba Corp Ｘ線イメージ管の歪補正装置
JP2014095636A (ja) * 2012-11-09 2014-05-22 Canon Inc Ｘ線撮像システム、及びｘ線撮像装置の制御方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000432A (en) * 1975-07-25 1976-12-28 Varian Associates Magnetic shield for image intensifier tube
EP0039502A1 (de) * 1980-05-06 1981-11-11 Siemens Aktiengesellschaft Anordnung zur Kompensation von auf Farbfernsehröhren einwirkenden magnetischen Fremdfeldern
US4392083A (en) * 1981-11-20 1983-07-05 Teletype Corporation Radiation shield for a cathode ray tube
EP0235863A1 (de) * 1986-03-07 1987-09-09 Philips Norden AB Verfahren und Vorrichtung zur Reduktion von magnetischen Streufeldern einer Kathodenstrahlröhre
US4732454A (en) * 1985-04-22 1988-03-22 Toray Industries, Inc. Light-transmissible plate shielding electromagnetic waves

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE427739A (de) * 1937-04-26
US3331979A (en) * 1962-09-24 1967-07-18 Gen Electric X-radiation-to-electrical signal transducer
US3757154A (en) * 1971-03-03 1973-09-04 Sony Corp Magnetic field on color television receivers apparatus for automatically eliminating the influence of the earth s
NL7703296A (nl) * 1977-03-28 1978-10-02 Philips Nv Roentgenbeeldversterkerbuis.
US4536882A (en) * 1979-01-12 1985-08-20 Rockwell International Corporation Embedded absorber X-ray mask and method for making same
US4472658A (en) * 1980-05-13 1984-09-18 Futaba Denshi Kogyo Kabushiki Kaisha Fluorescent display device
JPS5795609A (en) * 1980-12-05 1982-06-14 Kangiyou Denki Kiki Kk Sheet coil
US4380716A (en) * 1981-10-09 1983-04-19 Hazeltine Corporation External magnetic field compensator for a CRT
DE3430406A1 (de) * 1983-08-20 1985-03-14 Riken EMC Co., Ltd., Nagoya, Aichi Transparente platte fuer optische zeichenwiedergabevorrichtung
JPS60182650A (ja) * 1984-02-29 1985-09-18 Toshiba Corp Ｘ線像増倍管装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000432A (en) * 1975-07-25 1976-12-28 Varian Associates Magnetic shield for image intensifier tube
EP0039502A1 (de) * 1980-05-06 1981-11-11 Siemens Aktiengesellschaft Anordnung zur Kompensation von auf Farbfernsehröhren einwirkenden magnetischen Fremdfeldern
US4392083A (en) * 1981-11-20 1983-07-05 Teletype Corporation Radiation shield for a cathode ray tube
US4732454A (en) * 1985-04-22 1988-03-22 Toray Industries, Inc. Light-transmissible plate shielding electromagnetic waves
EP0235863A1 (de) * 1986-03-07 1987-09-09 Philips Norden AB Verfahren und Vorrichtung zur Reduktion von magnetischen Streufeldern einer Kathodenstrahlröhre

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 182 (E-131)(1060) 18 septembre 1982, & JP-A-57 95609 (KANGIYOU DENKI KIKI K.K.) 16 juin 1982, *

Also Published As

Publication number Publication date
JPH01298705A (ja) 1989-12-01
FR2629628A1 (fr) 1989-10-06
US5032764A (en) 1991-07-16
FR2629628B1 (fr) 1990-11-23

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