US3141117A - Magnetic lens device for producing magnetic fields with an even number of four or more poles - Google Patents

Magnetic lens device for producing magnetic fields with an even number of four or more poles Download PDF

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Publication number
US3141117A
US3141117A US217508A US21750862A US3141117A US 3141117 A US3141117 A US 3141117A US 217508 A US217508 A US 217508A US 21750862 A US21750862 A US 21750862A US 3141117 A US3141117 A US 3141117A
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United States
Prior art keywords
poles
magnetic
conductors
grooves
lens
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Expired - Lifetime
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US217508A
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English (en)
Inventor
Scheer Max
Keil Eberhard
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.)
Siemens Schuckertwerke AG
Siemens Corp
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Siemens Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements common to two or more basic types of discharge tubes or lamps
    • H01J3/14—Arrangements for focusing or reflecting ray or beam
    • H01J3/20—Magnetic lenses
    • H01J3/22—Magnetic lenses using electromagnetic means only
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses
    • H01J29/66—Magnetic lenses using electromagnetic means only

Definitions

  • Our invention relates to lens devices for producing a magnetic field and particularly to such devices having an even number of four or more poles for action upon charged corpuscular radiation.
  • a known device for producing a magnetic four-pole field comprises individual poles located opposite each other in pairs and having a hyperbolic or rather an approximately hyperbolic surface, the poles being connected with one another by a closed yoke structure consisting preferably of a single iron body together with the poles. Each pole is provided with its own excitation winding. The winding sense of the respective windings is so chosen that poles of the same magnetic polarity are located opposite each other.
  • Such four-pole lenses require a relatively large amount of iron as well as complicated winding shapes and must be produced with extreme precision. This renders themheavy in weight and expensive to manufacture.
  • a magnetic field-pole lens with an even number of four, six, eight or more poles, by maintaining the density of the area currents on the surface of the cylindrical hollow space substantially proportional to the sine of a value that constitutes the mathematical product of an integral number ni l times the azimuth angle a, wherein n denotes an integer larger than 1 and Zn is the number of field poles. Consequently, a Zn-pole field is obtained by an n-subdivision of the angle on with the aid of n-windings.
  • a four-pole lens is provided by distributing the sinusoidally distributed area-current density required for homogeneous fields, over one-half of the periphery and by doubling the winding.
  • the area-current density proportional to the sine of twice the azimuth angle a.
  • Equation 2 Equation 2
  • I denotes the current which flows through the series connectedwindings, the sum to be taken over an octant in the case of a four-pole lens.
  • the drawing shows only one quadrant of a four-pole field lens with a grooved iron body with a total of 72 grooves.
  • the other quadrants are identical, considering only the alternating current direction, so that it is not necessary to show them on the drawing.
  • the grooves are provided with field windings in a manner similar to that of conventional electric motors or other dynamo-electric machines.
  • the individual conductors in the grooves all have the same cross section and are preferably connected in series with each other to be traversed by the same current, the series connection extending over one, two or all quadrants.
  • the number of winding turns in each of (H R-cosnd the nine grooves N to N that occupy an octant differ from each other in accordance with the above-explained requirements.
  • the number of winding conductors in the sequence of grooves N to N is 23, 22, 21, 19, 16, 13, 10, 6 and 2 respectively. It will be seen that the distribution of the area currents over the cylinder surface is preferably effected in a stepwise, graduated manner. For other permissible departures from the ideal values, other winding numbers and a correspondingly different graduation will result.
  • the magnetic field was computed, for example, for a square raster of points located Within a quadrant in the opening of the cylinder.
  • the x-axis and y-axis were subdivided between and 0.9-R into steps of 0.1 -R.
  • R For a given value of R, one obtains in this example the value of the magnetic field by multiplying the above-mentioned numerical values or the number of winding turns with the term
  • Field lenses according to the invention have the advantage of requiring comparatively little iron and little winding copper and may be given a magnetizable stator structure as conventional for electric motors. Such laminated stators further permit employing the lens for pulsating fields having four or more poles.
  • the lenses according to the invention further do not require the use of complicated trapezoidal windings as is the case with the known lenses heretofore available for similar purposes.
  • the illustrated magnetic lens is made of laminated sheets having the shape of a machine armature.
  • the lens possesses an outer diameter of 214 mm. and an inner diameter of 150 mm., with a length of 300 mm.
  • 72 radial grooves are uniforrnly distributed in the inner periphery, each extending along the length of the lens. This provides, in a four-pole lens, 18 grooves per sector, the grooves in each sector being designated N (at one edge of each sector) to N and to N (at the other edge of the sector).
  • the electrical current during continuous use may have a value of approximately amperes. Transient currents may then have a corre- 5 spondingly higher value.
  • a magnetic lens comprising a hollow body having a cylindrical inner opening of circular cross section and having 221 magnetic field poles, n being an integer greater 10 than unity, and electric current conductors extending parallel to the cylinder axis and distributed along the cylinder periphery in accordance with a density of the area current on the cylinder surface proportional to the sine of n-x, wherein x denotes the azimuth angle, said conductors being wound in directions to produce opposing polarities in adjacent poles.
  • a magnetic lens comprising a magnetizable ringshaped body having a substantially cylindrical lens opening of circular cross section and having peripherally sequential magnet-field poles of alternately different polarity equally spaced from each other, the number of said poles being 211, with n being an integer greater than unity, electric conductors extending parallel to the cylinder axis and inductively linked in groups with said respective poles,
  • the number of conductors in sequential groups being graduated in accordance with proportionality of the areacurrent density to the sine of tthe value n-x, wherein x denotes the azimuth angle, said conductors being wound in directions to produce opposing polarities in adjacent poles.
  • said ringshaped body being a hollow-cylindrical iron structure having grooves extending radially outwardly from said opening to form said poles intermediate said grooves, and
  • said conductors consisting of windings disposed in said grooves, said conductors being wound in directions to produce opposing polarities in adjacent poles.
  • said conductors of said windings having all the same cross section 40 and the same current magnitude, and the number of conductors in respective sequential grooves being different in accordance with said proportionality, said conductors being wound in directions to produce opposing polarities in adjacent poles.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Windings For Motors And Generators (AREA)
  • Lens Barrels (AREA)
  • Electron Beam Exposure (AREA)
US217508A 1961-08-02 1962-07-25 Magnetic lens device for producing magnetic fields with an even number of four or more poles Expired - Lifetime US3141117A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES75144A DE1169602B (de) 1961-08-02 1961-08-02 Magnetfeldlinse

Publications (1)

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US3141117A true US3141117A (en) 1964-07-14

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US217508A Expired - Lifetime US3141117A (en) 1961-08-02 1962-07-25 Magnetic lens device for producing magnetic fields with an even number of four or more poles

Country Status (5)

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US (1) US3141117A (de)
CH (1) CH423021A (de)
DE (1) DE1169602B (de)
GB (1) GB958826A (de)
NL (1) NL280741A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633208A (en) * 1983-06-10 1986-12-30 Siemens Aktiengesellschaft Magnetic multi-pole arrangement of the nth order

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1514704B1 (de) * 1966-03-14 1971-01-14 Siemens Ag Spulenkoerper

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437513A (en) * 1946-10-12 1948-03-09 Gen Electric Deflection coil and yoke for cathode-ray tubes
US2881341A (en) * 1955-04-12 1959-04-07 Motorola Inc Deflection yoke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437513A (en) * 1946-10-12 1948-03-09 Gen Electric Deflection coil and yoke for cathode-ray tubes
US2881341A (en) * 1955-04-12 1959-04-07 Motorola Inc Deflection yoke

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633208A (en) * 1983-06-10 1986-12-30 Siemens Aktiengesellschaft Magnetic multi-pole arrangement of the nth order

Also Published As

Publication number Publication date
DE1169602B (de) 1964-05-06
GB958826A (en) 1964-05-27
CH423021A (de) 1966-10-31
NL280741A (de)

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