EP1653446A2 - Modularer Magnetkopf zur Abtastung magnetisierter Bänder oder Fäden - Google Patents

Modularer Magnetkopf zur Abtastung magnetisierter Bänder oder Fäden Download PDF

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Publication number
EP1653446A2
EP1653446A2 EP05110115A EP05110115A EP1653446A2 EP 1653446 A2 EP1653446 A2 EP 1653446A2 EP 05110115 A EP05110115 A EP 05110115A EP 05110115 A EP05110115 A EP 05110115A EP 1653446 A2 EP1653446 A2 EP 1653446A2
Authority
EP
European Patent Office
Prior art keywords
core
modular
end edge
magnetic head
cores
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.)
Granted
Application number
EP05110115A
Other languages
English (en)
French (fr)
Other versions
EP1653446B1 (de
EP1653446A3 (de
Inventor
Carlo Gritella
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.)
PHOTOVOX Srl
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PHOTOVOX Srl
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 PHOTOVOX Srl filed Critical PHOTOVOX Srl
Publication of EP1653446A2 publication Critical patent/EP1653446A2/de
Publication of EP1653446A3 publication Critical patent/EP1653446A3/de
Application granted granted Critical
Publication of EP1653446B1 publication Critical patent/EP1653446B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint

Definitions

  • the present invention relates to a magnetic head of the type defined in the preamble of claim 1.
  • the magnetic head is intended for scanning a code stored on a strip of magnetic material, in particular - but not exclusively - a security thread incorporated within a banknote.
  • a security thread is disposed perpendicularly to a major side of a banknote, and extends for the entire width of the banknote, parallel to a minor side thereof.
  • a known type of magnetic security thread is composed of a support strip which may be made of a flexible and impermeable plastics material, on which are deposited some areas of magnetic material such as, for example, iron oxides.
  • a different amount of magnetic material is applied in the various zones of the thread, varying the thickness, the density or the extent of the area occupied.
  • Modern devices for verifying the authenticity of banknotes are generally provided with feed means for feeding a banknote in a direction substantially perpendicular to the magnetic security thread, and with a scanning head comprising a "gap" which constitutes the sensitive part of the head, for scanning the code stored in the security thread.
  • a magnetic head of known type comprises a core of magnetic material in the shape of an open ring composed of a pair of half-cores constituted by two profile sections of ferromagnetic metal sheet, elongate in a longitudinal direction and having substantially C-shaped opposed cross-sections; the rearward end edges are physically in contact in order to have magnetic continuity between the two half-cores.
  • the forward end edges however are spaced by means of the insertion of a thin sheet of magnetically non-conductive material (e.g. copper), so that the two half-cores together constitute a ring magnetically opened in its forward part by a longitudinal gap which constitutes the sensitive part of the head.
  • each half-core is overmoulded a covering of electrically insulating material, and round this is wound a coil, the heads of which are connected to respective PINs disposed at the bottom.
  • the whole constituted by the core and windings is immersed in a synthetic resin within a screening container made of permalloy, so that only the forward surface of the head, which has the gap, emerges from the screen.
  • the passage of a magnetic security thread which moves perpendicularly to the gap generates, by magnetic induction, an electrical voltage in the coils which is made available at the PINs.
  • magnetic heads have been constructed by assembling two half-cores having a length corresponding to that of the head. This involves significant investment, since it is necessary each time to provide a different die for the shearing and bending of the sheets of the half-cores, and a different mould for overmoulding the layer of plastics material capable of electrically insulating the half-cores from the respective windings.
  • the problem is particularly acute in the field of devices for verifying the authenticity of banknotes, where it is necessary to construct heads which are different each time because of the range defined by the various positions which the security thread assumes within banknotes of different sizes.
  • the core of a magnetic head 10 comprises a pair of half-cores, right 11 and left 12, that are elongate in a direction defined here as longitudinal and facing one another in a transverse direction.
  • the two half-cores have substantially C-shaped opposed cross-sections, with respective rearward edges 13, 14, in contact, and respective forward edges 15, 16 separated by a thin strip 17 of magnetically non-conductive material.
  • the references 18, 19 indicate coils wound round the half-cores and electrically insulated therefrom by means of bodies of plastics material, as described in detail hereinafter.
  • each half-core is composed of a plurality of modular half-core elements 20 longitudinally side by side with one another.
  • each modular element 20 has a substantially C-shaped cross-section, with a rearward portion 21 extending in a transverse direction with a free end edge 13 intended to contact the free end edge 14 of an opposed identical modular element 20 forming part of the opposed half-core, an intermediate portion 22, substantially perpendicular to the rearward portion 21, and a forward portion 23 having a part 24 protruding longitudinally from one side with respect to the intermediate portion 22.
  • the forward portion 23 is therefore asymmetric ( Figure 3) with respect to a transverse plane which passes centrally through the rearward portion 21 and intermediate portion 22.
  • Figure 4 illustrates diagrammatically the arrangement assumed by the modular elements 20 in the head, once assembled. Due to the shape of the modular elements 20, when two of these elements 20a, 20b, each belonging to a different half-core, are opposed in such a way as to align transversely the rearward edges 13, 14 in contact with one another, the protruding part 24 of one of the two elements (20a) protrudes in the opposed longitudinal direction with respect to the protruding part 24 of the other element 20b.
  • the forward portions 23 of the modular elements of a half-core 11 are longitudinally staggered, preferably by half a pitch, with respect to the forward portions 23 of the modular elements of the other half-core 12.
  • Each pair of modular elements 20a, 20b transversely fitted side by side constitutes an open ring section of the core of the head.
  • each modular element 20 is inserted and partially received in a support of plastics material 25 forming a tubular portion 26 (of rectangular section in the example illustrated) which contains within it the intermediate portion 22 and/or the rearward portion 21 of a modular element 20.
  • a support of plastics material 25 forming a tubular portion 26 (of rectangular section in the example illustrated) which contains within it the intermediate portion 22 and/or the rearward portion 21 of a modular element 20.
  • One of the supports 25 is illustrated separately in Figures 5A and 5B.
  • Round the tubular portion 26 is wound a coil 18 (or 19) the heads of which are electrically connected to connecting PINs 27 protruding from the rearward part of the head ( Figures 6A, 6B and 7A, 7B).
  • each support 25 is of modular type and has lateral connection means and seats 28 in the shape of small recesses and protuberances for being coupled mechanically to two like supports longitudinally adjacent on opposite sides and capable of supporting modular elements 20 belonging to the same half-core, and further front connection means and seats 30, 31, in the shape of small recesses and protuberances for mechanical coupling to a transversely adjacent support which supports a modular element 20 belonging to the other half-core.
  • the forward part of each support 25 forms a horizontal plate portion 32 longitudinally staggered with respect to the main body of the support, such as to leave exposed a seat or recess 28 in which engages a small protuberance (not illustrated) projecting from the lower surface of the plate 32.
  • the supports 25 further have a forward, vertical plate portion 29 forming a protuberance 30 and a recess 31 for mechanical coupling to the transversely opposed support of the other half-core.
  • the tubular portion 26 is inclined obliquely in a transverse plane and has two external flanges 26a for containing the coil.
  • the method for the assembly of the head according to the invention is as follows. After a coil has been wound round the tubular portion 26 of a support 25, a modular element 20 is inserted into the support, passing the element 20 through an opening 34 formed in the face of the support intended to face the centre line of the head. The angular joining portion between the intermediate portion 22 and rearward portion 21 remains inside the tubular portion 26 of the support. The free end edge 13 of the modular element protrudes transversely from the tubular portion of the support towards the centre line of the head, as illustrated in Figure 1. Since the forward portion 23 of the modular element 20 has a larger transverse dimension than that of the opening 34 of the support, the modular element remains suspended in a stable manner in the support in an intermediate stage of assembly (Figure 7A).
  • the assembly formed by the two half-core groups with the strip 17 interposed, as shown in Figure 8 is placed in a screening container 36 of conventional type, and partially immersed in a bonding resin, as known to experts in the field, obtaining a single block which is then cut along the line L, allowing the opposite poles of the core and the gap to emerge.
  • the PINs 27 are then connected to an electrical or electronic apparatus which receives and processes the electrical signals generated in the coils by the passage of a magnetized strip or thread which slides transversely on the head.
  • the present invention allows to produce in a modular manner magnetic heads of any desired length, solving the problems outlined in the introduction of the present description.
  • any transverse line T intersects the head in such a way as to remain contained between the opposed lateral edges of the forward portion of at least one (20a or 20b) of the elements of a pair of modular elements transversely side by side.
  • Each modular element is magnetically coupled to the two modular elements longitudinally adjacent thereto in the same half-core. Therefore a strip of magnetized material (not illustrated) such as, for example, a security thread of a banknote, which passes transversely on the head along any transverse line T1-T4, always clearly intersects the forward portion of at least one modular element of one of the two half-core groups.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Heads (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Optical Recording Or Reproduction (AREA)
EP05110115A 2004-10-29 2005-10-28 Modularer Magnetkopf zur Abtastung magnetisierter Bänder oder Fäden Expired - Lifetime EP1653446B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000753A ITTO20040753A1 (it) 2004-10-29 2004-10-29 Testina magnetica modulare per la lettura di bande o fili magnetizzati

Publications (3)

Publication Number Publication Date
EP1653446A2 true EP1653446A2 (de) 2006-05-03
EP1653446A3 EP1653446A3 (de) 2008-06-11
EP1653446B1 EP1653446B1 (de) 2009-07-29

Family

ID=35658854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05110115A Expired - Lifetime EP1653446B1 (de) 2004-10-29 2005-10-28 Modularer Magnetkopf zur Abtastung magnetisierter Bänder oder Fäden

Country Status (7)

Country Link
EP (1) EP1653446B1 (de)
JP (1) JP2006127742A (de)
KR (1) KR101183637B1 (de)
AT (1) ATE438175T1 (de)
DE (1) DE602005015660D1 (de)
ES (1) ES2330858T3 (de)
IT (1) ITTO20040753A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109559421A (zh) * 2017-09-25 2019-04-02 深圳粤宝电子科技有限公司 磁芯及磁性图像传感器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3526725A (en) * 1961-07-24 1970-09-01 Armour Res Found Electromagnetic transducer head with plural magnetic circuits,gaps and windings
US5614824A (en) * 1995-05-15 1997-03-25 Crane & Co., Inc. Harmonic-based verifier device for a magnetic security thread having linear and non-linear ferromagnetic characteristics
GB0100451D0 (en) * 2001-01-08 2001-02-21 Rue De Int Ltd Method for reading coded magnetic threads

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109559421A (zh) * 2017-09-25 2019-04-02 深圳粤宝电子科技有限公司 磁芯及磁性图像传感器

Also Published As

Publication number Publication date
JP2006127742A (ja) 2006-05-18
DE602005015660D1 (de) 2009-09-10
ITTO20040753A1 (it) 2005-01-29
ATE438175T1 (de) 2009-08-15
KR20060049379A (ko) 2006-05-18
EP1653446B1 (de) 2009-07-29
EP1653446A3 (de) 2008-06-11
ES2330858T3 (es) 2009-12-16
KR101183637B1 (ko) 2012-09-17

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