`
`
`United States Patent 19
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`Haas
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`[11]
`[45]
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`4,075,591
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`Feb. 21, 1978
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`[54] PRINTED CIRCUIT COILS
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`[56]
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`References Cited
`U.S. PATENT DOCUMENTS
`
`
`
`
`854,774
`5/1907
`Taylor cevsstessstesesesesssesnsee 336/223
`Inventor: Dieter Haas, Hildesheim, Germany
`[75]
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`1,647,474
`Seymour...
`ws» 336/200 X
`:
`11/1927
`
`
`
`
`
`
`
`
`
`2,604,519
` Mackereth ..:.
`. 336/223 X
`[73] Assignee:
`-Blaupunkt-Werke GmbH,
`7/1952
`
`
`
`
`
`
`
`
`
`2,735,979
`Cohen.......
`Hildesheim, Germany
`sw 336/223 X
`2/1956
`
`
`
`
`
`
`3,210,706 10/1965 Book...cecccteeececteeee 336/69 X
`
`
`
`
`
`
`
`
`
`
`
`
`8/1972
`3,688,232
`..cccsissccsesesetseseseseeere 336/69
`Szatmari
`1 No:
`(21) A :
`763,852
`.
`No.:
`
`Primary Examiner—ThomasJ. Kozma
`:
`PP
`,
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`:
`.
`31,
`Attorney, Agent, or Firm—Fiynn & Frishauf
`[22] Filed:
`Jan. 31, 1977
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`ABSTRACT
`[57]
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`The conducting pathwidth of a spiral printed circuit
`coil is reduced for the inside of the spiral coil to obtain
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`more inductance in the same space without substantial
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`sacrifice in Q. In another form ofspiral coil with non-
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`constant path width, the path width is reduced in a
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`sector of the coil located between the inner and outer
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`terminals to reduce the distance between terminals with
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`minimum sacrifice in inductance of Q.
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`2 Claims, 2 Drawing Figures
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`sgs
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`Related U.S. Application Data
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`Division of Ser. No. 686,520, May 14, 1976, Pat. No.
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`4,016,519.
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`[62]
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`[SU Int, C12 oeeccsscssseseseeseerssesienseseceneaes HOIF 27/28
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`[52] U.S. C1. wesceceeseesteeseseeeeseeee 336/200; 336/223;
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`336/232
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`[58] Field of Search.
`................. 336/223, 232, 200, 69,
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`336/70; 174/68.5
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`age 1 of 4
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`SAMSUNG EXHIBIT 1022
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`Page 1 of 4
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`SAMSUNG EXHIBIT 1022
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`Page 2 of 4
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`4,075,591
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`1;
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`" PRINTED CIRCUIT COILS...
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`This is a division, of -application. Ser. No. 686,520,
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`filed May 14, 1976, now U.S. Pat. No. 4,016,519... -
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`This invention relates. to a, printed circuit coil of the
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`spiral type. It is commonly regarded as. impractical to
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`produceinductivecoils.in integrated. circuit technology
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`under present techniques.In order to be able,to produce
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`inductances in a small space within small dimensional
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`tolerances, coils have been made by..printed circuit
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`techniques for some time. Thus, a coilin-the form. of a
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`flat spiral has been printed on an insulating carrier plate
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`in the same way .as.circuit connection-paths have been
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`madefor printed circuits, Such a coil can be madewith
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`turns printed either on one side or on both sides of the
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`plate of insulating material.
`The electrical magnitudes:of such coils, for.example
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`the inductance orthe Qare determined ‘predominantly
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`by the length of the. winding, the path width, the spac-
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`ing between-adjacent paths and. the,averageturn diame-
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`ter. In the known formsof. such coils, these parameters
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`are selected atparticular fixed. values,so that for.obtain-
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`ing a particular inductance a certain space requirement,
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`which can be calculated from.the.parameters, results.
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`This space requirement of coursecan be limited by the
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`apparatus dimensions and .the resulting. limitations on
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`space available for. the circuit board. There-is the fur-
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`ther problem in the:case of coils. printed on one side of
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`the board, that one connection point ofthe coil is inside
`the coil and the other outside of it. It is often desirable
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`to connect both of these connection points with a single
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`component, for example a capacitor which forms a
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`resonant circuit with the coil. This objective is often not
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`obtainable, because the necessary inductance and Q of
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`the coil requires a path width and a numberofturnsthat
`results in a distance between the contact areas of the
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`coil that far exceeds the usual spacing of component
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`leads designed for printed circuits.
`40
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`In consequence, in conventional production methods,
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`coils of a particular Q for a prescribed space require-
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`ment can be made only up to a relatively low value of
`inductance that must not be exceeded. Otherwise stated,
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`for a particular amount of available space, the Q of a
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`coil can only be increased at the expense of inductance.
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`It is an object of the invention to provide printed
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`circuit coils having a combination of electrical values
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`exceeding the limits of those made by conventional
`methods.
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`SUBJECT MATTER OF THE INVENTION
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`Briefly, instead of utilizing spiral windings in which
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`the conducting path is of constant width, the width of
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`the conducting path in different portions of the winding
`is varied so as to make the most effective use of the
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`available area on the insulating plate from the point of
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`view ofthe electrical qualities of the coil. In one form of
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`the invention, the path width of the spiral conductor of
`the coil decreases from the outside to the inside of the
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`60
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`spiral, preferably decreasing from turn to turn from the
`outside to the inside of the coil. In another form of the
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`invention, a sector of the coil including a portion of
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`each complete turn passing through the sector is of
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`narrower path width than the remainder of the coil.
`65
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`Preferably, this sector is located between the inner and
`outer contact areas for the ends of the coil and the
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`conducting paths in this sector of the coil are straight
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`and parallel to each other.
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`2
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`Printed circuit coils of the first-mentioned form of the
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`invention designed for.a prescribed space requirement
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`have substantially higher Q than. those of. conventional
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`design without anysignificant reduction of inductance.
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`Printed circuit coils of the. above-mentioned second
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`form of the invention obtain inductance values of con-
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`ventional coils with only slight. sacrifice of Q, while
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`obtaining the advantage that. the required spacing be-
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`tween the coil end contact areas is substantially re-
`‘duced.
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`The inventionis further described by way ofillustra-
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`tive examplewith reference to the accompanying draw-
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`ing, in which:
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`FIG.1 is a plan view of a printed circuit coil illustrat-
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`ing the first form of the invention, and
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`FIG.2 is a plan view ofa printed circuit coil illustrat-
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`ing the second form of the invention.
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`Thespiral printed circuit coil 1 shown in FIG. 1 has
`an inner contact area 2 from which the successive turns
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`of the coil run in spiral configuration. The outer end of
`the coil 1 and its contact area are ‘not shown in FIG.1.
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`Thecoil 1 has the overall shape of an oval. This shape
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`is, of course, purely illustrative and other shapes such as
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`circular, pear-shaped, etc., may be used to the same
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`effect. The coil 1 is printed on an insulating plate 3 by
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`any conventional method, as for example by applying a
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`resist to the circuit areas by printing or photolithogra-
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`phy and etching away the uncoveredareas of an overall
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`metal layer originally provided on the insulating plate,
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`leaving a conducting path firmly bondedto theinsulat-
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`ing plate. A hole 4 through the insulating plate is pro-
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`vided on the inside of the coil 1, for mounting a ferro-
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`magnetic core, as for examplea ferrite core, for the coil.
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`The insulating plate is also bored twice inside the
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`contact area 2, in the illustrated example, so that it is
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`possible to make two connections to the coil at this
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`point, if desired.
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`For carrying out the invention, the turns of the coil 1
`increase in width from the inside to the outside. The
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`spacing between the individual turns is kept constant.
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`For a minimum space requirement, the spacing between
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`turns can be chosen as small as it can reliably be pro-
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`duced by the printed circuit technology utilized.
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`Comparedto a conventionally printed coil, where the
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`path width is constantfor the entire winding, a higher Q
`can be obtained for about the same inductance, or a
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`higher inductance can be obtained for substantially the
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`samevalue of Q. The parameter Q is given by the for-
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`mula Lw/R and hence corresponds, for a given fre-
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`quency, to the ratio of inductanceto internal resistance.
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`A comparable Q can be obtained with a conventional
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`coil only if its path width would correspond to that of
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`the outer windings of the coil shown in FIG. 1. In the
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`same space, therefore, only a substantially smaller in-
`ductance could be obtained. On the other hand, if a
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`conventional coil were made with the conductor width
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`of the inner windings of the coil shown in FIG.1, it
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`would have substantially smaller Q for the same value
`of inductance.
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`FIG. 2 showsa printed circuit coil designed for rela-
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`tively close spacing of the inner and outer contact areas
`for the endsof the coil. The turns of the coil § shown in
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`FIG. 2 have approximately the form of a half-oval.
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`Thus, each of the turns can be regarded as made up of
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`a straight portion and a half-oval portion, and the wind-
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`ing as a whole, can likewise be regarded as made up of
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`two portions, a first sector 6 where the turns run exclu-
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`sively straight and parallel to each other and the re-
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`50
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`Page 3 of 4
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`Page 3 of 4
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`4,075,591
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`15
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`3
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`maining larger sector 7, where they are in large part
`a design according to FIG. 2, for the same spacing
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`between inner and outer terminal areas.
`curved. The winding of the coil 5 still runs spirally from
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`the inner contact area 8 to the outer contact area 9. The
`Although the invention has been described by way of
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`contact areas 8 and 9 for the erids of the coil are so
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`particular illustrative embodiments for each of two
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`forms of the invention, it will be understood that the
`placed that they are opposite each other onthesector6,
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`advantages of the invention may be obtained by varia-
`with the straight portion of the winding running be-
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`tions and modifications within the inventive concept. It
`tween them. Thecoil 5 is of conventional design in the
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`is likewise possible to combine the features of both
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`second and larger sector 7, which is to say that all turns
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`forms of the invention, as by providing a coil of the
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`have the same path width and the spacing between
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`general configuration of FIG. 2 with a path width that
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`adjacentturns is constant. The path width andthe radii
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`decreases towardsthe inside of the coil, both with re-
`of the turns are selected in accordance with conven-
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`spect to the straight-path sector between the coil termi-
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`tional principles. The path width in thefirst sector 6,
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`nals and with respect to th remainderofthe coil where
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`however,
`is substantially smaller than in the second
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`each turn has a greater path width than the portion of
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`sector 7. In this manner,it is possible to provide more
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`the samepath in the sector between the terminals.
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`turns between the contact areas 8 and 9 than by conven-
`I claim:
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`tional design without
`increasing the spacing of the
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`1. A printed circuit coil of spiral configuration
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`contact areas at negligible sacrifice in electrical quali-
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`formed on a surface plate of insulating material provid-
`ties.
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`ing substantially all of the inductance of a resonant
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`20
`The spacing between contact areas 8 and9is often
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`circuit and composedofa layer of conducting material
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`fixed by a raster or module design to suit a standard
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`in a continuousspiral path providing a plurality of coil
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`configuration of connection leads for components to be
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`turns with a substantially constant spacing between
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`‘mounted on the circuit board. For a given coil Q, the
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`adjacentturns and further having the improvement that
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`inductanceof the coil, such as the coil 5 shown in FIG.
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`the path width is not uniform and decreases from the
`25
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`2, can be substantially increased comparedto the induc-
`outside turn to the inside turn.
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`tance of a conventional coil in which the same spacing
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`in
`2. A printed circuit coil as defined in claim 1,
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`between the inner and outer contactareas is provided.
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`which each successive turn of the spiral proceeding
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`In an illustrative practical application, the inductance of
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`from the inside to the outside, is of greater average path
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`the coil can be increased by 95%, with a reduction of Q
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`width than the preceding turn insideofit.
`©
`&
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`*¢
`&©
`30
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`by less than 2% by going from a conventional design to
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`35
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`45
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`50
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`55
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`65
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`neeeeeeeeeeeeeeeeeres
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`Page 4 of 4
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`Page 4 of 4
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