WO1997004425A1 - Inductor - Google Patents
Inductor Download PDFInfo
- Publication number
- WO1997004425A1 WO1997004425A1 PCT/GB1996/001591 GB9601591W WO9704425A1 WO 1997004425 A1 WO1997004425 A1 WO 1997004425A1 GB 9601591 W GB9601591 W GB 9601591W WO 9704425 A1 WO9704425 A1 WO 9704425A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inductor
- magnetic circuit
- circuit element
- ferromagnetic material
- inductor according
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
- G07D5/08—Testing the magnetic or electric properties
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
- G07D5/02—Testing the dimensions, e.g. thickness, diameter; Testing the deformation
Definitions
- the present invention relates to an inductor, an inductive sensor and a coin validator.
- Inductors such as are employed in electronic coin validators, are conventionally provided with ferrite magnetic circuit elements, e.g. cores. Ferrites are light and do not corrode but are very hard and brittle. This makes them difficult to work and prone to breakage.
- ferrites are conductive. Consequently, if a coil is to be wound a core of such a ferrite, an insulating layer must be placed between the coil windings and the core.
- Permanent magnets comprising ferromagnetic powder embedded in a polymer are known for applications such as "fridge magnets”.
- magnetically hard refers to ferromagnetic materials which can be permenantly magnetized and “magnetically soft” refers to ferromagnetic materials which cannot be permenantly magnetized.
- the present inventors have discovered that, su ⁇ risingly, by substituting the magnetically hard powder by a magnetically soft material, magnetic circuit elements for inductors can be produced and that these elements are acceptable for critical applications such as the inductive sensors of a coin validator.
- an inductor including a magnetic circuit element, characterised in that the magnetic circuit element comprises a polymer loaded with a ferromagnetic material in particulate form.
- the ferromagnetic material will be magnetically soft.
- the polymer may be thermoplastic or thermosetting. Thermoplastic polymers are preferred as . these allow the use of injection moulding.
- the magnetic circuit element will be non-conductive and flexibly resilient.
- the flexibility of the element greatly reduces the risk of damage thereto.
- the ferromagnetic material comprises manganese-zinc doped ferrite or oxidized iron dust. More preferably, the magnetic circuit element comprises 80% to 93%, advantageously 88% to 91% in the case of manganese- zinc doped ferrite, by weight ferromagnetic material.
- Nylon 6 or polypropylene may be conveniently used as the polymer.
- Alternative polymers are polycarbonates, acrylics, ABS and high density styrenes.
- the magnetic circuit element comprises a first portion and a second portion, the first and second portions being glued together.
- complex shapes can be easily formed.
- the first portion comprises an elongate I- or C-section member and the second portion comprises a C-shaped member having first and second spaced flanges, arranged to cover at least partially respective end faces of the first member, and a strip coupling the flanges and closing the groove in a side of the I- or C-section member.
- Such elongate forms are very so vulnerable to breakage when formed from solid ferrite material.
- an inductive sensor including a sensing inductor according to the present invention.
- a sensor may be employed in a coin validator.
- a coin validator is an apparatus for determining whether a piece offered as a coin or token belongs to a predetermined set of coins or tokens.
- an inductor characterised by injection moulding a composition comprising a polymer loaded with a ferromagnetic material in particulate form to form a structure.
- the composition is heated to a temperature below 220°C for moulding. More preferably, the composition is heated to 150°C for moulding.
- a coil is assembled in association with the structure by winding directly thereon.
- the structure may be injection moulded in two parts which are subsequently glued together.
- Figure 1 shows a coin validator
- Figure 2 is an exploded view of an inductor according to the present invention
- Figure 3 shows an inductor according to the present invention.
- a coin validator body 1 defines a rectangular cross- section coin passageway 2.
- the passageway 2 comprises a straight, vertical upper portion 2a, where various sensor stations 3 are located, and a wider lower portion 2b.
- An accept gate 4 is arranged for diverting coins along either of two routes.
- the accept gate 4 normally blocks route one route but is opened if the signals from the sensor stations 3 indicate that a valid coin has been inserted into the validator.
- the upper portion 2a of the passageway 2 has ⁇ width greater than the diameter of the largest coin 5 of interest and a depth greater than the thickness of the thickest coin of interest.
- the entry to the upper portion 2a of the passageway is flared so as to simplify alignment of the validator with a coin insertion slot (not shown).
- an upstream optical sensor station comprises a lensed light emitting diode (LED) 6 mounted in the validator body 1, so as to shine a beam U of light across the width w of the passageway 2 through a slit 7 opening into the passageway 2.
- the slit 7 extends across the full depth of the upper portion 2a of the passageway.
- a lensed photosensor 8 aligned to receive the beam from the LED 6 completes the upstream optical sensor station.
- a downstream optical sensor is similarly constructed from a lensed LED 9, a slit 10 and a lensed photosensor 11 to shine a beam D across the passageway 2, and is located a short distance below the upstream sensor.
- Two elongate sense coils 12 are located between the upstream and the downstream optical sensor stations. The sense coils 12 are press fitted longitudinally into respective slots extending transversely across the width w of the upper portion 2a of the passageway.
- a coil 12 comprises an elongate, I-section former 20 about which the winding 21 is wound.
- the former 20 is formed from polypropylene loaded with 90% by weight Mn-Zn ferrite powder.
- the former 20 as it is substantially non-conducting, can serve both as a core and as a bobbin onto which the winding 21 is wound directly.
- An electromagnetic shield 22 comprises an elongate member of the same material as the core, having a flange extending perpendicularly at each end.
- the shield 22 is arranged to be attached to the former 20 such that the winding 21 is wholly covered along one long side of the former 20 by the elongate member and at least partially covered at the ends of the former 20.
- the purpose of the shield 22 is to increase the Q of the coil 12 but also reduces both the susceptibility of the coil 12 to electromagnetic interference (EMI) and the electromagnetic energy emanating from the coil, other than into the coin passageway 2 (Figure 1) of the validator.
- EMI electromagnetic interference
- the former 20 and the shield 22 are formed by coating the ferrite particles with a coupling agent such as an alkyl-silane or an amino-silane, and mixing the coated ferrite with polypropylene.
- a coupling agent such as an alkyl-silane or an amino-silane
- the composition thus formed is then heated to about 150°C and injection moulded. After the moulding process, the former 20 and the shield 22 are removed from the sprues to which they are connected.
- the coil winding 21 is wound directly onto the former 20 and the shield 22 is then glued to the former 20.
- the present invention is applicable to magnetic circuit elements having other geometries, for instance conventional pot cores. Indeed, it is a feature of the present invention that complex geometries can be readily produced by one or more techniques selected from moulding, machining and welding rather than pressing and sintering.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Coins (AREA)
- Coils Or Transformers For Communication (AREA)
- Soft Magnetic Materials (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU63127/96A AU704994B2 (en) | 1995-07-14 | 1996-07-02 | Inductor |
JP9506389A JPH11510624A (en) | 1995-07-14 | 1996-07-02 | Inductor |
EP96922142A EP0840917B1 (en) | 1995-07-14 | 1996-07-02 | Inductor |
DE69619528T DE69619528D1 (en) | 1995-07-14 | 1996-07-02 | INDUKTOR |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9514459.8 | 1995-07-14 | ||
GBGB9514459.8A GB9514459D0 (en) | 1995-07-14 | 1995-07-14 | Coin validator |
GBGB9611263.6A GB9611263D0 (en) | 1995-07-14 | 1996-05-30 | Inductor |
GB9611263.6 | 1996-05-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997004425A1 true WO1997004425A1 (en) | 1997-02-06 |
Family
ID=26307403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1996/001591 WO1997004425A1 (en) | 1995-07-14 | 1996-07-02 | Inductor |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0840917B1 (en) |
JP (1) | JPH11510624A (en) |
KR (1) | KR19990028987A (en) |
CN (1) | CN1191031A (en) |
AU (1) | AU704994B2 (en) |
CA (1) | CA2226581A1 (en) |
DE (1) | DE69619528D1 (en) |
GB (1) | GB9611263D0 (en) |
WO (1) | WO1997004425A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1014312A1 (en) * | 1998-03-17 | 2000-06-28 | Kabushiki Kaisha Nippon Conlux | Method and device for detecting coin |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005295775A (en) * | 2004-04-05 | 2005-10-20 | Nidec Shibaura Corp | Rotor of motor |
KR100664065B1 (en) | 2005-06-20 | 2007-01-03 | 엘지전자 주식회사 | Structure for fixing magnet of spm type motor |
WO2014192378A1 (en) * | 2013-05-31 | 2014-12-04 | 日本電産サンキョー株式会社 | Apparatus for identifying coin-shaped detection object |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6159705A (en) * | 1984-08-30 | 1986-03-27 | Hitachi Metals Ltd | Manufacture of composite magnet |
JPS63217602A (en) * | 1987-03-06 | 1988-09-09 | Tdk Corp | Porous magnetic substance and manufacture thereof |
JPH0192272A (en) * | 1987-10-03 | 1989-04-11 | Inoue Mtp Co Ltd | Polymer alloy magnet and production thereof |
WO1993006569A1 (en) * | 1991-09-24 | 1993-04-01 | Coin Controls Limited | Coin discrimination apparatus |
US5293980A (en) * | 1992-03-05 | 1994-03-15 | Parker Donald O | Coin analyzer sensor configuration and system |
JPH06124380A (en) * | 1992-10-09 | 1994-05-06 | Anritsu Corp | Coin sensor of coin deciding device |
-
1996
- 1996-05-30 GB GBGB9611263.6A patent/GB9611263D0/en active Pending
- 1996-07-02 DE DE69619528T patent/DE69619528D1/en not_active Expired - Lifetime
- 1996-07-02 KR KR1019980700289A patent/KR19990028987A/en not_active Application Discontinuation
- 1996-07-02 JP JP9506389A patent/JPH11510624A/en active Pending
- 1996-07-02 EP EP96922142A patent/EP0840917B1/en not_active Expired - Lifetime
- 1996-07-02 CA CA002226581A patent/CA2226581A1/en not_active Abandoned
- 1996-07-02 CN CN96195544A patent/CN1191031A/en active Pending
- 1996-07-02 AU AU63127/96A patent/AU704994B2/en not_active Ceased
- 1996-07-02 WO PCT/GB1996/001591 patent/WO1997004425A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6159705A (en) * | 1984-08-30 | 1986-03-27 | Hitachi Metals Ltd | Manufacture of composite magnet |
JPS63217602A (en) * | 1987-03-06 | 1988-09-09 | Tdk Corp | Porous magnetic substance and manufacture thereof |
JPH0192272A (en) * | 1987-10-03 | 1989-04-11 | Inoue Mtp Co Ltd | Polymer alloy magnet and production thereof |
WO1993006569A1 (en) * | 1991-09-24 | 1993-04-01 | Coin Controls Limited | Coin discrimination apparatus |
US5293980A (en) * | 1992-03-05 | 1994-03-15 | Parker Donald O | Coin analyzer sensor configuration and system |
JPH06124380A (en) * | 1992-10-09 | 1994-05-06 | Anritsu Corp | Coin sensor of coin deciding device |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 224 (E - 425) 5 August 1986 (1986-08-05) * |
PATENT ABSTRACTS OF JAPAN vol. 013, no. 005 (E - 701) 9 January 1989 (1989-01-09) * |
PATENT ABSTRACTS OF JAPAN vol. 013, no. 302 (C - 616) 12 July 1989 (1989-07-12) * |
PATENT ABSTRACTS OF JAPAN vol. 018, no. 417 (P - 1781) 4 August 1994 (1994-08-04) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1014312A1 (en) * | 1998-03-17 | 2000-06-28 | Kabushiki Kaisha Nippon Conlux | Method and device for detecting coin |
EP1014312A4 (en) * | 1998-03-17 | 2006-02-01 | Nippon Conlux Co Ltd | Method and device for detecting coin |
Also Published As
Publication number | Publication date |
---|---|
EP0840917A1 (en) | 1998-05-13 |
KR19990028987A (en) | 1999-04-15 |
CN1191031A (en) | 1998-08-19 |
DE69619528D1 (en) | 2002-04-04 |
AU6312796A (en) | 1997-02-18 |
CA2226581A1 (en) | 1997-02-06 |
GB9611263D0 (en) | 1996-07-31 |
JPH11510624A (en) | 1999-09-14 |
EP0840917B1 (en) | 2002-02-27 |
AU704994B2 (en) | 1999-05-13 |
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