JP2001240271A - Paper sheet discriminating device - Google Patents

Paper sheet discriminating device

Info

Publication number
JP2001240271A
JP2001240271A JP2000059217A JP2000059217A JP2001240271A JP 2001240271 A JP2001240271 A JP 2001240271A JP 2000059217 A JP2000059217 A JP 2000059217A JP 2000059217 A JP2000059217 A JP 2000059217A JP 2001240271 A JP2001240271 A JP 2001240271A
Authority
JP
Japan
Prior art keywords
electrodes
electrode
paper sheet
sheet
capacitance
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
JP2000059217A
Other languages
Japanese (ja)
Other versions
JP3755798B2 (en
Inventor
Kazuo Fujiwara
一雄 藤原
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.)
Glory Ltd
Original Assignee
Glory Ltd
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 Glory Ltd filed Critical Glory Ltd
Priority to JP2000059217A priority Critical patent/JP3755798B2/en
Publication of JP2001240271A publication Critical patent/JP2001240271A/en
Application granted granted Critical
Publication of JP3755798B2 publication Critical patent/JP3755798B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00Sensing or detecting means
    • B65H2553/20Sensing or detecting means using electric elements
    • B65H2553/23Capacitive detectors, e.g. electrode arrangements

Abstract

PROBLEM TO BE SOLVED: To provide a paper sheet discriminating device capable of discriminating a condition of the attachment of a very small piece of tape or the like onto a surface of a paper sheet such as a bill and securities with high accuracy. SOLUTION: A solid electrode 41 is used in this paper sheet discriminating device, an electrode edge face at a paper sheet conveying side is rounded or chamfered, and the electrode is coated with a dielectric material, whereby the unevenness of the electric field between the electrodes can be improved, and the change of the electrostatic capacity between the electrodes caused by the vertical variation of the paper sheet can be reduced when the paper sheet is conveyed between the electrodes.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、紙葉類の状態を
判別する紙葉類判別装置に関し、特に、対向電極間に紙
葉類を搬送し、電極間の静電容量の変化を検出して紙葉
類の状態を精度良く判別することのできる紙葉類判別装
置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discriminating apparatus for discriminating a state of a sheet, and more particularly, to a sheet conveying apparatus for detecting a change in capacitance between electrodes by conveying the sheet between opposing electrodes. The present invention relates to a paper sheet discriminating apparatus capable of accurately discriminating the state of paper sheets.

【0002】[0002]

【従来の技術】紙幣や証券等の紙葉類の表面にテープや
シール等が貼付されていることがあり、このような紙葉
類の状態を判別する紙葉類判別装置が提案されている。
2. Description of the Related Art Tapes and stickers are sometimes attached to the surface of paper sheets such as banknotes and securities, and a paper sheet discriminating apparatus for discriminating the state of such paper sheets has been proposed. .

【0003】まず、図9を参照して、従来の紙葉類判別
装置に具備されている電極について説明する。
First, with reference to FIG. 9, electrodes provided in a conventional sheet discriminating apparatus will be described.

【0004】図9は、従来の紙葉類判別装置に具備され
ている電極の外観を示す図である。
FIG. 9 is a view showing the appearance of an electrode provided in a conventional paper sheet discriminating apparatus.

【0005】従来の紙葉類判別装置においては、2枚の
平板状の電極11を所定の間隔を空けて配置した平行平
板コンデンサの電極間に紙葉類14を搬送し、この時の
紙葉類の厚みの変化に伴う電極間の静電容量の変化を、
リード線12の先にある2つの端子13の間の電圧から
取り出すことで紙葉類の状態を判別していた。
In the conventional sheet discriminating apparatus, a sheet 14 is transported between electrodes of a parallel plate capacitor in which two flat electrodes 11 are arranged at a predetermined interval. The change in capacitance between electrodes due to the change in thickness
The state of the paper sheet is determined by extracting the voltage from the voltage between the two terminals 13 at the end of the lead wire 12.

【0006】又、紙葉類の状態を高速に判別する為に、
紙葉類を高速に搬送させると、搬送時に紙葉類の詰まり
が生じることがあり、これを防止する為に、電極間に適
当な間隔を空け、紙葉類を搬送させていた。
In order to determine the state of paper sheets at high speed,
When the papers are transported at a high speed, the papers may be clogged at the time of transportation, and in order to prevent this, the papers are transported with an appropriate interval between the electrodes.

【0007】次に、図10を参照して、従来の紙葉類判
別装置における電極間の電場の強度分布について説明す
る。
Next, the distribution of the electric field intensity between the electrodes in the conventional paper sheet discriminating apparatus will be described with reference to FIG.

【0008】図10は、従来の紙葉類判別装置における
電極間の電場の強度分布を示す模式図である。
FIG. 10 is a schematic diagram showing an electric field intensity distribution between electrodes in a conventional paper sheet discriminating apparatus.

【0009】図10(a)は、2つの電極11の間の電
場の強度を電気力線16の間隔で示しており、電気力線
16の間隔が密になるほど電場の強度は強くなり、又電
気力線16の間隔が疎になるほど電場の強度は弱くなる
ことを示している。
FIG. 10A shows the intensity of the electric field between the two electrodes 11 by the distance between the electric lines of force 16. The closer the distance between the lines of electric force 16 becomes, the stronger the electric field becomes. This shows that the electric field strength decreases as the interval between the electric flux lines 16 becomes smaller.

【0010】電極近傍位置(D=D1,D=−D1)に
おいては、電極端部の直角形状部分での電荷密度が増大
する為に、電極の端部(X=X1,X=−X1)に近づ
くにつれて、電極中央部(X=X0)より電気力線16
の間隔が密になり、電場の強度は次第に強くなる。
At the position near the electrode (D = D1, D = -D1), the charge density at the right-angled portion of the electrode end increases, so that the end of the electrode (X = X1, X = -X1) , The line of electric force 16 from the center of the electrode (X = X0)
And the strength of the electric field gradually increases.

【0011】これとは逆に、電極間の中間位置(D=
0)においては、電極の端部(X=X1,X=−X1)
に近づくにつれて、電気力線16の間隔が疎になる為
に、電場の強度は次第に弱くなる。
On the contrary, an intermediate position between the electrodes (D =
0), the ends of the electrodes (X = X1, X = −X1)
, The electric field strength gradually decreases because the interval between the electric flux lines 16 becomes narrower.

【0012】又、同図(b)に示すように、電極両端部
(X=X1,X=−X1)において、電極からの距離に
応じて、電場の強度が大きく変化する為に、電極と平行
な方向で電場の強度を平均してみると、電場の強度は電
極近傍位置(D=D1,D=−D1)で最大となり、こ
れとは逆に、電極間隔の中央位置(D=0)で最小とな
る。従って、従来の紙葉類判別装置における電極間の電
場の強度分布は、非常に不均一になっている。
As shown in FIG. 1B, at both ends of the electrode (X = X1, X = -X1), the intensity of the electric field greatly changes depending on the distance from the electrode. When the electric field strength is averaged in the parallel direction, the electric field strength becomes maximum at the positions near the electrodes (D = D1, D = -D1), and conversely, the center position of the electrode interval (D = 0) ) Is the minimum. Therefore, the intensity distribution of the electric field between the electrodes in the conventional paper sheet discriminating apparatus is very non-uniform.

【0013】続いて、図11を参照して、従来の電極に
おける紙葉類による静電容量の検出量の変化特性につい
て説明する。
Next, with reference to FIG. 11, a description will be given of a change characteristic of a capacitance detection amount by a sheet in a conventional electrode.

【0014】図11は、従来の電極における紙葉類によ
る静電容量の検出量の変化特性を示す図である。
FIG. 11 is a diagram showing a change characteristic of a capacitance detection amount by a sheet of paper in a conventional electrode.

【0015】同図において、図中の静電容量の変化曲線
は、従来の電極間に紙幣を1枚搬送した時に電極間から
検出される静電容量21及び従来の電極間にテープが貼
付された紙幣を1枚搬送した時に電極間から検出される
静電容量22の変化を示している。
In the figure, the change curve of the capacitance in the figure shows the capacitance 21 detected from between the electrodes when a banknote is transported between the conventional electrodes and the tape between the conventional electrodes. The change of the capacitance 22 detected from between the electrodes when one banknote is conveyed is shown.

【0016】なお、平行平板コンデンサの電極間の距離
は1.8[mm]、電極の面積は10[mm]に設定
し、紙葉類の表面に面積が10[mm]のテープを貼
付している。
[0016] The distance between the parallel plate capacitor electrodes 1.8 [mm], the area of the electrode was set to 10 [mm 2], the tape area to the surface of the paper sheet 10 [mm 2] Affixed.

【0017】電極間に紙葉類のような誘電体が搬送され
た際に、誘電体は電極間の電場にさらされる為に、誘電
体内の電荷は分極化され、電極間の静電容量が増加す
る。この分極化は、電場の強度が強い部分ほど大きくな
り、これに伴い電極間の静電容量も増加する。
When a dielectric such as paper is transported between the electrodes, the dielectric is exposed to an electric field between the electrodes, so that the electric charge in the dielectric is polarized and the capacitance between the electrodes is reduced. To increase. This polarization increases as the intensity of the electric field increases, and accordingly, the capacitance between the electrodes also increases.

【0018】上述したように、従来の紙葉類判別装置に
おける電極間の電場の強度分布は、非常に不均一になっ
ており、電極間のほぼ中央(D=0)よりも、電極近傍
付近(D=D1,D=−D1)の電場の強度が強い為、
電極からの紙葉類の距離が0[mm]又は1.8[m
m]、つまり紙葉類がいずれかの電極に接した時に、電
極間から検出される静電容量は最大となり、これとは逆
に、紙葉類が平行平板コンデンサの電極間のほぼ中央に
ある時に、電極間から検出される静電容量は最小とな
る。
As described above, the intensity distribution of the electric field between the electrodes in the conventional paper sheet discriminating apparatus is very non-uniform, and is closer to the vicinity of the electrodes than to the center (D = 0) between the electrodes. (D = D1, D = −D1) because the electric field strength is strong,
The distance of the paper sheet from the electrode is 0 [mm] or 1.8 [m
m], that is, when the sheet comes into contact with any one of the electrodes, the capacitance detected between the electrodes becomes the maximum, and conversely, the sheet is almost at the center between the electrodes of the parallel plate capacitor. At some point, the capacitance detected between the electrodes is at a minimum.

【0019】[0019]

【発明が解決しようとする課題】上述した紙葉類判別装
置において、平行平板コンデンサの電極間で紙葉類を高
速に搬送させると、搬送中に紙葉類が上下変動を起こし
やすくなる。上述したように、電極間における電場の強
度は、電極からの距離により不均一である為に、電極間
において紙葉類が上下変動を起こすと、同じ紙葉類が電
極間に搬送されていても、紙葉類が搬送されている電極
間の位置により、電極間から検出される静電容量の値が
変化する。
In the above-described paper sheet discriminating apparatus, when the paper sheets are conveyed at high speed between the electrodes of the parallel plate capacitor, the paper sheets are likely to fluctuate up and down during the conveyance. As described above, the strength of the electric field between the electrodes is non-uniform depending on the distance from the electrodes. Therefore, when the paper fluctuates vertically between the electrodes, the same paper is conveyed between the electrodes. Also, the value of the capacitance detected between the electrodes changes depending on the position between the electrodes on which the sheet is being conveyed.

【0020】この時、1枚の紙幣が電極近傍付近を搬送
されている時に電極間から検出される静電容量と、微少
なテープが貼付された紙幣が電極間のほぼ中央を搬送さ
れている時に電極から検出される静電容量はほぼ同じ値
である為、紙葉類の正常な状態と紙葉類の表面に微少な
大きさのテープが貼付されている状態とを判別する事が
困難であった。
At this time, the capacitance detected between the electrodes when one bill is conveyed in the vicinity of the electrodes, and the bill to which a minute tape is adhered is conveyed almost at the center between the electrodes. Sometimes the capacitance detected from the electrodes is almost the same value, so it is difficult to distinguish between the normal state of the paper sheet and the state in which a very small tape is attached to the surface of the paper sheet Met.

【0021】そこで、この発明は、紙幣や証券などの紙
葉類の表面に微少な大きさのテープ等が貼付されている
状態を精度良く判別することのできる紙葉類判別装置を
提供することを目的とする。
Accordingly, the present invention provides a sheet discriminating apparatus capable of accurately discriminating a state in which a tape or the like of a minute size is adhered to the surface of a sheet such as a bill or a securities. With the goal.

【0022】[0022]

【課題を解決するための手段】上述した目的を達成する
為に、請求項1の発明は、紙葉類の搬送路に設けられた
対向電極間の静電容量の変化により、前記搬送路を搬送
される紙葉類の状態を判別する紙葉類判別装置におい
て、前記対向電極を構成する各電極の対向面の少なくと
も縁部を斜面若しくは曲面状としたことを特徴とする。
In order to achieve the above-mentioned object, a first aspect of the present invention is to change the capacitance between opposing electrodes provided on a paper sheet conveyance path by changing the conveyance path. In a sheet discriminating apparatus for discriminating a state of a conveyed sheet, at least an edge portion of an opposing surface of each electrode constituting the opposing electrode is formed to have a slope or a curved surface.

【0023】又、請求項2の発明は、請求項1の発明に
おいて、前記対向電極を構成する各電極は、誘電体で被
覆された誘電体被覆電極であることを特徴とする。
According to a second aspect of the present invention, in the first aspect of the present invention, each of the electrodes constituting the counter electrode is a dielectric-coated electrode coated with a dielectric.

【0024】又、請求項3の発明は、請求項1又は2の
発明において、前記対向電極を構成する各電極は、前記
対向面を底面とする円柱状電極若しくは角柱状電極であ
ることを特徴とする。
According to a third aspect of the present invention, in the first or second aspect of the invention, each of the electrodes constituting the counter electrode is a columnar electrode or a prism electrode having the opposite surface as a bottom surface. And

【0025】又、請求項4の発明は、請求項1乃至3の
いずれかの発明において、前記対向電極は、前記搬送路
に前記紙葉類の搬送方向と直交する方向に複数配列され
たアレイ状電極であることを特徴とする。
According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, a plurality of the counter electrodes are arranged in the transport path in a direction perpendicular to the transport direction of the paper sheet. Characterized in that it is a shaped electrode.

【0026】又、請求項5の発明は、請求項1乃至4の
いずれかの発明において、前記対向電極間の静電容量を
検出する静電容量検出手段と、前記静電容量検出手段が
検出した静電容量の変化に基づいて前記紙葉類の状態を
判別する判別手段とを具備することを特徴とする。
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the capacitance detecting means for detecting the capacitance between the opposed electrodes and the capacitance detecting means detect the capacitance between the opposed electrodes. And determining means for determining the state of the paper sheet based on the change in capacitance.

【0027】[0027]

【発明の実施の形態】この発明に関する紙葉類判別装置
の一実施例を、添付図面を参照して詳細に説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a paper sheet discriminating apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

【0028】まず、図1を参照して、本発明を適用した
電極について説明する。
First, an electrode to which the present invention is applied will be described with reference to FIG.

【0029】図1は、電極の外観を示す図である。FIG. 1 is a diagram showing the appearance of the electrode.

【0030】同図において、(a)は円柱状電極31の
斜視図であり、(b)はその上面断面を示す図であり、
(c)は側面断面を示す図である。
FIG. 3A is a perspective view of the columnar electrode 31, FIG.
(C) is a figure which shows the side surface cross section.

【0031】(a)乃至(c)に示すように、円柱状電
極31は一方の底面の縁部に丸め加工を施した円柱状の
電極である。
As shown in (a) to (c), the columnar electrode 31 is a columnar electrode in which an edge of one bottom surface is rounded.

【0032】又、(d)は角柱状電極32を示す斜視図
であり、(e)はその上面断面を示す図であり、(f)
は側面断面を示す図である。
FIG. 2D is a perspective view showing the prismatic electrode 32, FIG. 2E is a view showing a cross section of the upper surface thereof, and FIG.
FIG. 4 is a diagram showing a side cross section.

【0033】(d)乃至(f)に示すように、角柱状電
極32は一方の底面の縁部に丸め加工を施した角柱状の
電極である。
As shown in (d) to (f), the prismatic electrode 32 is a prismatic electrode in which the edge of one bottom surface is rounded.

【0034】円柱状電極31、角柱状電極32の電極と
も、丸め加工を施した端面どうしを、一定距離を空けて
対向させ、1組の対向電極として用いる。
The rounded end faces of the cylindrical electrode 31 and the prismatic electrode 32 are opposed to each other at a predetermined distance, and used as a pair of opposed electrodes.

【0035】このように、紙葉類が搬送される側の電極
下側端面の全周に丸め加工が施されていることで、電極
下側端面の端部における電荷密度の増大が抑止され、こ
の端部における電場の強度が弱められる。そして、電極
下側端面の端部と中央付近との電場の強度差が小さくな
り、その結果、電極間における電場の強度分布の不均一
性が改善される。
As described above, the entire periphery of the lower end face of the electrode on which the paper sheet is conveyed is rounded, so that an increase in the charge density at the end of the lower end face of the electrode is suppressed. The strength of the electric field at this end is reduced. Then, the difference in the electric field intensity between the end of the lower end surface of the electrode and the vicinity of the center is reduced, and as a result, the unevenness of the electric field intensity distribution between the electrodes is improved.

【0036】又、上述した平行平板コンデンサと異な
り、電極が立体形状に施されている為、電極に厚みがあ
る。電極に厚みを持たせることで、電極上側端面と紙葉
類が搬送される対向電極間とを遠ざけ、電極上側端面か
ら対向電極間に及ぶ影響を低減する。
Also, unlike the above-mentioned parallel plate capacitor, the electrodes are formed in a three-dimensional shape, so that the electrodes have a certain thickness. By making the electrodes thicker, the upper end face of the electrode is separated from the opposing electrode to which the paper sheet is conveyed, and the influence from the upper end face of the electrode to the opposing electrode is reduced.

【0037】なお、上述した電極下側端面に加工を施す
際に、端面の全周に丸め加工を施す他に、同様に端面の
全周に面取り加工を施しても良い。
When the above-described lower end face of the electrode is processed, besides performing rounding on the entire circumference of the end face, chamfering processing may be similarly performed on the entire circumference of the end face.

【0038】続いて、図2を参照して、誘電体材で被覆
を施した対向電極について説明する。
Next, the counter electrode coated with a dielectric material will be described with reference to FIG.

【0039】図2は、誘電体材で被覆を施した対向電極
の外観を示す図である。
FIG. 2 is a view showing the appearance of a counter electrode coated with a dielectric material.

【0040】同図(a)は誘電体材で被覆を施した対向
電極の斜視図であり、(b)は紙葉類の搬送方向から見
た時のその側面断面図であり、(c)は紙葉類の搬送方
向と直交した方向から見た時のその断面図である。な
お、上述した平行平板コンデンサと同様に、電極からリ
ード線43及びリード線の先に端子44を具備してい
る。
FIG. 2A is a perspective view of a counter electrode coated with a dielectric material, FIG. 2B is a side cross-sectional view of the sheet viewed from the conveying direction, and FIG. FIG. 4 is a cross-sectional view of the sheet viewed from a direction perpendicular to the transport direction of the sheet. In addition, similarly to the above-mentioned parallel plate capacitor, a lead 44 is provided from the electrode and a terminal 44 is provided at the end of the lead.

【0041】このように、対向電極を誘電体材42で被
覆すると、対向電極により形成された電場中にさらされ
た誘電体材42の内部において、電荷の分極化が生じ
る。分極化が生じることにより、誘電体材42の内部の
電場の強度が弱められ、特に、電場の強度が強い部分ほ
ど分極化が大きく生じ、電場の強度が弱められる程度が
大きくなる。
As described above, when the opposing electrode is covered with the dielectric material 42, charge polarization occurs inside the dielectric material 42 exposed to the electric field formed by the opposing electrode. As a result of the polarization, the intensity of the electric field inside the dielectric material 42 is reduced. In particular, the higher the intensity of the electric field, the greater the polarization occurs, and the degree to which the intensity of the electric field is reduced is increased.

【0042】ところで、上述したような電極形状とする
ことにより、電極下側端面の端部と中央付近との電場の
強度差は小さくなるが、それでも端部の方が中央付近よ
りも電場の強度が大きく、電極41においても同じ状態
である。従って、電極41を誘電体材42で被覆するこ
とで、上述したように電極下側端面の中央付近よりも電
場の強度が強い端部の誘電体材42の内部で分極化が大
きく生じ、他の部分よりも電場の強度が大きく弱められ
る。これにより、電極間における電場の強度分布の不均
一性が更に改善される。なお、比誘電率が高い誘電体材
を用いるほど、この効果は高まる。
By using the above-described electrode shape, the difference in the electric field strength between the end of the lower end surface of the electrode and the vicinity of the center is small, but the strength of the electric field is still smaller at the end than at the center. Is large, and the same is true for the electrode 41. Therefore, by covering the electrode 41 with the dielectric material 42, as described above, a large polarization occurs inside the dielectric material 42 at the end where the intensity of the electric field is higher than near the center of the lower end face of the electrode, and The intensity of the electric field is greatly reduced as compared with the portion. This further improves the non-uniformity of the electric field intensity distribution between the electrodes. This effect increases as the dielectric material having a higher relative dielectric constant is used.

【0043】又、(a)乃至(c)に示すように、上述
した円柱状電極41は誘電体材42で被覆が施されてお
り、少なくとも紙葉類が搬送される側の誘電体材42の
面は平面状である為、紙葉類が搬送されやすくなり、紙
葉類の詰まりが生じるのを防止する。
As shown in (a) to (c), the above-mentioned columnar electrode 41 is coated with a dielectric material 42, and at least the dielectric material 42 on the side to which paper sheets are conveyed. Is flat, so that the paper sheets are easily transported, thereby preventing the paper sheets from being jammed.

【0044】更に、(c)に示すように、紙葉類が搬送
される側の面の、紙葉類が挿入される側とその反対側の
両辺にそれぞれ面取り加工が施されている為、紙葉類が
一層搬送されやすくなり、紙葉類の詰まりが生じるのを
防止する。
Further, as shown in FIG. 4C, since the side on which the paper sheets are conveyed is chamfered on both sides on the side where the paper sheets are inserted and on the opposite side, Paper sheets are more easily conveyed, and jamming of the paper sheets is prevented.

【0045】又、これらの特徴は紙葉類の詰まりが生じ
るのを防止するのみならず、紙葉類を安定して搬送さ
せ、電極間において紙葉類が上下変動することを防止す
る。
These features not only prevent paper sheets from being jammed, but also stably transport the paper sheets and prevent the paper sheets from fluctuating vertically between the electrodes.

【0046】なお、上述した電極41には、アルミニウ
ムや銅等の導電性の良い金属性の材質が用いられ、誘電
体材42には、ポリアセタール樹脂等の樹脂やセラミッ
ク材料が用いられる。
The above-mentioned electrode 41 is made of a metallic material having good conductivity such as aluminum or copper, and the dielectric material 42 is made of a resin such as polyacetal resin or a ceramic material.

【0047】ここで、図3を参照して、本発明を適用し
た紙葉類判別装置における電極間の電場の強度分布につ
いて説明する。
Here, with reference to FIG. 3, the distribution of the electric field intensity between the electrodes in the paper sheet discriminating apparatus to which the present invention is applied will be described.

【0048】図3は、本発明を適用した紙葉類判別装置
における電極間の電場の強度分布を示す模式図である。
FIG. 3 is a schematic diagram showing an electric field intensity distribution between electrodes in a paper sheet discriminating apparatus to which the present invention is applied.

【0049】同図(a)は、既に図示した図10(a)
と同様に、電場の強度を電極間の電気力線16の間隔で
示しており、電気力線16の間隔が密になるほど電場の
強度が強くなり、又電気力線16の間隔が疎になるほど
電場の強度が弱くなることを示している。
FIG. 10A is a view similar to FIG.
Similarly to the above, the strength of the electric field is indicated by the interval between the electric lines of force 16 between the electrodes, and the intensity of the electric field increases as the interval between the lines of electric force 16 increases, and the intensity of the electric field increases as the interval between the lines of electric force 16 decreases. This indicates that the electric field strength is weakened.

【0050】上述したように、従来の紙葉類判別装置に
おける電極間の電場の強度分布は不均一であったが、本
発明を適用した紙葉類判別装置においては、紙葉類が搬
送される側の電極の端面に丸め加工若しくは面取り加工
を施したことで、電極間の電気力線の間隔は、いずれの
部分においてもほぼ一定であり、電場の強度がほぼ均一
であることを示している。
As described above, the electric field intensity distribution between the electrodes in the conventional paper sheet discriminating apparatus is not uniform, but in the paper sheet discriminating apparatus to which the present invention is applied, the paper sheet is conveyed. By performing rounding or chamfering on the end surface of the electrode on the other side, the interval between the lines of electric force between the electrodes is almost constant in any part, indicating that the electric field strength is almost uniform. I have.

【0051】又、この時の電場の強度を電極と平行な方
向で平均してみても、同図(b)に示すように、いずれ
の電極間の位置において、電場の強度がほぼ均一であ
る。なお、電極に誘電体材42で被覆が施されているこ
とで、電極間の電場の強度の均一性を一層高めている。
When the electric field strength at this time is averaged in a direction parallel to the electrodes, the electric field strength is almost uniform at any position between the electrodes as shown in FIG. . In addition, since the electrodes are coated with the dielectric material 42, the uniformity of the electric field strength between the electrodes is further enhanced.

【0052】続いて、図4を参照して、本発明を適用し
た電極における紙葉類による静電容量の検出量の変化特
性について説明する。
Next, with reference to FIG. 4, a description will be given of the change characteristic of the capacitance detection amount by the paper sheet in the electrode to which the present invention is applied.

【0053】図4は、本発明を適用した電極における紙
葉類による静電容量の検出量の変化特性を示す図であ
る。
FIG. 4 is a diagram showing a change characteristic of a detection amount of capacitance by a paper sheet in an electrode to which the present invention is applied.

【0054】従来の紙葉類識別装置と同様の条件で、電
極における紙葉類による静電容量の検出量の変化をみた
ものであり、本発明の電極間に紙幣を1枚搬送した時に
電極間から検出される静電容量23及び本発明の電極間
にテープが貼付された紙幣を1枚搬送した時に電極間か
ら検出される静電容量24の変化を示している。
The change in the amount of capacitance detected by the sheet at the electrode under the same conditions as those of the conventional sheet identification apparatus is shown. The figure shows changes in the capacitance 23 detected from between the electrodes and the capacitance 24 detected from between the electrodes when one banknote with a tape attached between the electrodes of the present invention is transported.

【0055】上述したように、従来の紙葉類判別装置に
おける電極間の電場の強度は不均一であった為に、紙葉
類の搬送中に、電極間において紙葉類が上下変動を起こ
すと、これに伴い電極間から検出される静電容量の値に
変化が生じたが、本発明の紙葉類判別装置においては、
上述したように電極間の電場の強度をほぼ均一に改善し
た為に、電極間における紙葉類の上下変動による静電容
量の変化が低減された。
As described above, the intensity of the electric field between the electrodes in the conventional paper sheet discriminating apparatus is not uniform, so that the paper sheets vertically fluctuate between the electrodes during the conveyance of the paper sheets. And a change in the value of the capacitance detected from between the electrodes in accordance with this, but in the paper sheet discriminating apparatus of the present invention,
As described above, since the intensity of the electric field between the electrodes is almost uniformly improved, the change in capacitance due to the vertical fluctuation of the sheet between the electrodes is reduced.

【0056】この為、搬送時に電極間で紙葉類の上下変
動が生じても、紙幣を1枚搬送させた時に電極間から検
出される静電容量の最大値は、微少なテープが貼付され
た紙幣を搬送させた時に電極間から検出される静電容量
の最小値より十分小さい値である為に、これらの静電容
量値の変化特性を検出することで、紙葉類の表面に面積
が10[mm]ほどの微少な大きさのテープが貼付さ
れている状態を精度良く判別することができる。
For this reason, even if paper sheets fluctuate up and down between the electrodes during transport, the maximum value of the capacitance detected between the electrodes when a single banknote is transported is small with a tape attached. Since the value of the capacitance is sufficiently smaller than the minimum value of the capacitance detected between the electrodes when the bills are conveyed, by detecting the change characteristics of these capacitance values, the area on the surface of the paper sheet is detected. Can accurately determine the state in which a tape having a size as small as about 10 [mm 2 ] is attached.

【0057】本発明の紙葉類判別装置においては、上述
したように電極間の電場の強度が従来の紙葉類判別装置
の電極間の電場の強度と比較してほぼ均一であり、紙葉
類の搬送時に、電極間における紙葉類の上下変動に起因
する静電容量の変化の影響が少ない為、折り目やしわの
ある紙葉類のように、搬送中に電極間で大きく上下変動
を引き起こす状態の紙葉類も扱える。更に、紙葉類が複
数枚重複している状態を判別することもでき、特に紙葉
類が重複している状態については、紙葉類の表面に微少
な大きさのテープ等が貼付されている状態を判別するよ
りも、電極間から検出される静電容量の差が明確である
為に、紙葉類が複数枚重複している状態を従来よりも高
精度に判別することができる。
In the paper sheet discriminating apparatus of the present invention, as described above, the intensity of the electric field between the electrodes is substantially uniform as compared with the electric field strength between the electrodes of the conventional sheet discriminating apparatus. Since the change in capacitance caused by the vertical movement of the paper sheet between the electrodes during transport of papers is small, the vertical fluctuation greatly between the electrodes during transportation, such as paper with folds and wrinkles. It can handle paper sheets in a state that causes them. Furthermore, it is also possible to determine a state in which a plurality of sheets are overlapped. Particularly, in a state in which the sheets are overlapped, a tape or the like of a minute size is attached to the surface of the sheet. Since the difference between the capacitances detected between the electrodes is clearer than the state in which the sheets are present, the state in which a plurality of sheets overlap can be determined with higher accuracy than in the past.

【0058】なお、上述したような電極は、図示しない
が紙葉類判別装置の判別対象の紙葉類が搬送される搬送
路に配置され、この紙葉類判別装置は判別対象の紙葉類
を搬送路に搬送しながら、紙葉類が対向電極間を通過す
る際に、対向電極間の静電容量を検出し、この検出され
た静電容量の変化に基づいて紙幣や証券等の紙葉類の状
態を判別する。
Although not shown, the electrodes as described above are arranged on a transport path on which a sheet to be discriminated by a sheet discriminating apparatus is conveyed. When the paper passes between the opposing electrodes while conveying the paper to the conveying path, the capacitance between the opposing electrodes is detected, and based on the detected change in the capacitance, paper such as banknotes or securities is detected. Determine the state of the leaves.

【0059】又、本発明の紙葉類判別装置において判別
できる紙葉類は、紙幣や証券の他にも、コピー用紙や証
明書等の紙葉状のものであれば良く、上述したような紙
葉類を判別する際には、これらの紙葉類の大きさに応じ
て、複数の対向電極を並列に配置させたアレイ状電極を
紙葉類判別装置に配し、紙葉類の状態を判別する。
The paper sheets that can be identified by the paper sheet identification apparatus of the present invention may be paper sheets, such as copy paper and certificates, in addition to bills and securities. When discriminating a leaf, an array-like electrode in which a plurality of counter electrodes are arranged in parallel is arranged in a sheet discriminating apparatus according to the size of the sheet, and the state of the sheet is determined. Determine.

【0060】そこで、図5及び図6を参照して、アレイ
状電極について説明する。
The array electrodes will now be described with reference to FIGS.

【0061】図5はアレイ状電極の外観を示す図であ
り、図6は対向電極間に紙葉類を搬送させる際の方法を
示す図である。
FIG. 5 is a view showing the appearance of the array-like electrodes, and FIG. 6 is a view showing a method for transporting paper sheets between the opposing electrodes.

【0062】図5において、(a)はアレイ状電極の斜
視図であり、(b)は紙葉類の搬送方向から見た時のそ
の側面断面図であり、(c)は紙葉類の搬送方向と直交
した方向から見た時のその断面図である。なお、図示し
ないが、各電極ごとに上述したリード線とリード線の先
に端子がそれぞれ具備されている。
In FIG. 5, (a) is a perspective view of an array of electrodes, (b) is a side cross-sectional view of the sheet viewed from the transport direction, and (c) is a sheet of paper. FIG. 4 is a cross-sectional view when viewed from a direction orthogonal to a transport direction. Although not shown, the above-described lead wire and a terminal of the lead wire are provided for each electrode.

【0063】アレイ状電極は、複数の電極41−1乃至
41−13が並列に配置され、対向電極が1組のみの時
と同様に、これらの電極1にも誘電体材42で被覆が施
されている。
In the array electrode, a plurality of electrodes 41-1 to 41-13 are arranged in parallel, and these electrodes 1 are coated with a dielectric material 42 in the same manner as when only one set of opposing electrodes is provided. Have been.

【0064】又、(c)に示すように、紙葉類が搬送さ
れる側の誘電体材42の面の、紙葉類が挿入される側と
その反対側の両辺にそれぞれ面取り加工が施されている
為、同様に紙葉類が搬送されやすくなり、紙葉類の詰ま
りが生じるのを防止する。
As shown in FIG. 9C, chamfering is performed on both sides of the dielectric material 42 on the side where the paper sheet is conveyed, on the side where the paper sheet is inserted and on the opposite side. Therefore, similarly, the paper sheet is easily transported, thereby preventing the paper sheet from being jammed.

【0065】なお、アレイ状電極の電極41の配置数や
配置間隔等については、検出対象の大きさに応じて、最
適な値に設定する。
The number of the electrodes 41 of the array electrodes and the intervals between the electrodes are set to optimal values according to the size of the detection target.

【0066】又、紙葉類を搬送させる際は、図6に図示
すように、搬送ローラ15により紙葉類14を短手方向
に搬送させながら、紙葉類14の長手方向が複数の対向
電極間を一度に通過するようにし、紙葉類の状態を高速
に判別する。
As shown in FIG. 6, when the paper sheet 14 is transported in the short direction by the transport roller 15, the longitudinal direction of the paper sheet 14 is changed into a plurality of opposite directions. The state of the paper sheet is determined at a high speed by passing between the electrodes at once.

【0067】更に、図7乃び図8を参照して、紙葉類を
判別する際の紙葉類判別装置の処理の流れを説明をす
る。
Further, with reference to FIGS. 7 and 8, the flow of processing of the sheet discriminating apparatus when discriminating a sheet will be described.

【0068】図7は紙葉類判別装置の静電容量の検出回
路の構成を示すブロック図であり、図8は紙葉類を判別
する際の処理の流れを示すフローチャートである。
FIG. 7 is a block diagram showing a configuration of a capacitance detecting circuit of the paper sheet discriminating apparatus. FIG. 8 is a flowchart showing a flow of processing when discriminating a paper sheet.

【0069】図6に示したように、図示しない搬送路に
紙葉類を、図中に示した矢印の方向に搬送させながら、
複数の各対向する電極41ごとに接続されている静電容
量−電圧変換部45において、対向電極間の静電容量の
変化を検出し(ステップ101)、電圧レベルに変換す
る(ステップ102)。
As shown in FIG. 6, paper sheets are conveyed in a conveying path (not shown) in the direction of the arrow shown in FIG.
The capacitance-voltage converter 45 connected to each of the plurality of opposing electrodes 41 detects a change in capacitance between the opposing electrodes (step 101) and converts the change into a voltage level (step 102).

【0070】比較判定部46は、変換された電圧レベル
とあらかじめ設定されている電圧レベルとを比較し(ス
テップ103)、変換された電圧レベルがしきい値以上
である時間が一定時間未満である場合には(ステップ1
04のYES)、正常として判定する(ステップ10
5)。又、変換された電圧レベルがしきい値以上である
時間が一定時間未満でない場合には(ステップ104の
NO)、異常として判定する(ステップ106)。
The comparison / determination unit 46 compares the converted voltage level with a preset voltage level (step 103), and the time when the converted voltage level is equal to or higher than the threshold value is less than a predetermined time. If so (Step 1
04 (YES), it is determined as normal (step 10)
5). If the time during which the converted voltage level is equal to or higher than the threshold value is not less than the predetermined time (NO in step 104), it is determined that there is an abnormality (step 106).

【0071】又、これらの判定処理は、各比較判定部4
6ごとにそれぞれ行われ(ステップ107のNO)、全
ての比較判定部46の判定結果により、対象の紙葉類の
状態が判別される(ステップ107のYES)。
These determination processes are performed by each of the comparison determination units 4.
6 (NO in step 107), and the state of the target sheet is determined based on the determination results of all the comparison determination units 46 (YES in step 107).

【0072】そして、全ての比較判定部46において、
異常が判定されなかった場合には(ステップ108のY
ES)、対象の紙葉類を正常券と判別し(ステップ10
9)、又、いずれかの比較判定部46において、異常が
判定された場合には(ステップ108のNO)、対象の
紙葉類を異常券と判別する(ステップ110)。
Then, in all the comparison / determination sections 46,
If no abnormality is determined (Y in step 108)
ES), and discriminates the target paper sheet as a normal ticket (step 10).
9) If any of the comparison / determination units 46 determines that an abnormality has occurred (NO in step 108), the target sheet is determined to be an abnormal ticket (step 110).

【0073】なお、ステップ104、ステップ108の
判断において、正常券と異常券とを判別する為の判断基
準はこれに限らず、適宜変更することができる。
In the judgments at steps 104 and 108, the criterion for discriminating between a normal ticket and an abnormal ticket is not limited to this, and can be changed as appropriate.

【0074】[0074]

【発明の効果】上述したように、本発明の紙葉類判別装
置は、紙葉類の静電容量を検出する電極を立体形状と
し、紙葉類が搬送される側の電極端面に丸め加工若しく
は面取り加工を施し、更にこの電極を誘電体材で被覆し
た事で、電極間の電場の強度の不均一を改善し、電極間
における紙葉類の上下変動による電極間の静電容量の変
化を低減できるように構成したので、紙幣や証券などの
紙葉類の表面に微少な大きさのテープ等が貼付されてい
る状態を精度良く判別することができる。
As described above, in the paper sheet discriminating apparatus of the present invention, the electrode for detecting the capacitance of the paper sheet has a three-dimensional shape, and the electrode end face on the side where the paper sheet is conveyed is rounded. Or, by performing chamfering and further covering this electrode with a dielectric material, the unevenness of the electric field between the electrodes is improved, and the capacitance between the electrodes changes due to the vertical fluctuation of the paper sheet between the electrodes. , It is possible to accurately determine a state in which a small-sized tape or the like is attached to the surface of a sheet such as a bill or a securities.

【0075】更に、折り目やしわのある紙葉類のよう
に、搬送中に電極間で大きく上下変動を引き起こす状態
の紙葉類を扱うことや、紙葉類が複数枚重複している状
態を従来よりも高精度に判別することができる。
Further, handling of a sheet which causes a large vertical movement between the electrodes during conveyance, such as a sheet having a fold or wrinkles, or a state where a plurality of sheets overlap each other. It is possible to determine with higher accuracy than before.

【図面の簡単な説明】[Brief description of the drawings]

【図1】電極の外観を示す図。FIG. 1 is a diagram showing an appearance of an electrode.

【図2】誘電体材で被覆を施した対向電極の外観を示す
図。
FIG. 2 is a diagram showing the appearance of a counter electrode coated with a dielectric material.

【図3】本発明を適用した紙葉類判別装置における電極
間の電場の強度分布を示す模式図。
FIG. 3 is a schematic diagram showing an electric field intensity distribution between electrodes in a paper sheet discriminating apparatus to which the present invention is applied.

【図4】本発明を適用した電極における紙葉類による静
電容量の検出量の変化特性を示す図。
FIG. 4 is a diagram showing a change characteristic of a detection amount of capacitance by a paper sheet in an electrode to which the present invention is applied.

【図5】アレイ状電極の外観を示す図。FIG. 5 is a diagram showing an appearance of an array of electrodes.

【図6】対向電極間に紙葉類を搬送させる際の方法を示
す図。
FIG. 6 is a diagram showing a method for transporting paper sheets between opposed electrodes.

【図7】紙葉類判別装置の静電容量の検出回路の構成を
示すブロック図。
FIG. 7 is a block diagram illustrating a configuration of a capacitance detection circuit of the paper sheet discrimination device.

【図8】紙葉類を判別する際の処理の流れを示すフロー
チャート。
FIG. 8 is a flowchart showing the flow of processing for determining paper sheets.

【図9】従来の紙葉類判別装置に具備されている電極の
外観を示す図。
FIG. 9 is a view showing the appearance of an electrode provided in a conventional paper sheet discriminating apparatus.

【図10】従来の紙葉類判別装置における電極間の電場
の強度分布を示す模式図。
FIG. 10 is a schematic diagram showing an intensity distribution of an electric field between electrodes in a conventional paper sheet discriminating apparatus.

【図11】従来の電極における紙葉類による静電容量の
検出量の変化特性を示す図。
FIG. 11 is a diagram showing a change characteristic of a detection amount of capacitance by a sheet in a conventional electrode.

【符号の説明】[Explanation of symbols]

11 電極 12 リード線 13 端子 14 紙葉類 15 搬送ローラ 16 電気力線 21 従来の電極間に紙幣を1枚搬送した時に電極間か
ら検出される静電容量 22 従来の電極間にテープが貼付された紙幣を1枚搬
送した時に電極間から検出される静電容量 23 本発明の電極間に紙幣を1枚搬送した時に電極間
から検出される静電容量 24 本発明の電極間にテープが貼付された紙幣を1枚
搬送した時に電極間から検出される静電容量 31 円柱状電極 32 角柱状電極 41 電極 42 誘電体材 43 リード線 44 端子 45 静電容量−電圧変換部 46 比較判定部
DESCRIPTION OF SYMBOLS 11 Electrode 12 Lead wire 13 Terminal 14 Paper sheet 15 Conveyance roller 16 Line of electric force 21 Electrostatic capacity detected from between electrodes when one banknote is conveyed between conventional electrodes 22 Tape is pasted between conventional electrodes The capacitance detected between the electrodes when one banknote is transported between the electrodes 23 The capacitance detected between the electrodes when one banknote is transported between the electrodes of the present invention 24 A tape is stuck between the electrodes of the present invention Capacitance detected from between the electrodes when one banknote is conveyed 31 Columnar electrode 32 Prismatic electrode 41 Electrode 42 Dielectric material 43 Lead wire 44 Terminal 45 Capacitance-voltage conversion unit 46 Comparison judgment unit

フロントページの続き Fターム(参考) 2F063 AA02 AA14 AA16 AA41 BA30 BC09 BD17 DA01 DA05 DB01 DB04 DD06 EB21 HA03 HA04 3E041 AA01 AA02 AA09 BA04 BB08 BC06 CA01 DB07 EA01 3F048 AB01 AB03 BA11 BA12 BA13 BA14 BA26 BB09 BB10 BD07 DA06 DB03 DB07 DB11 DC18 EB22 Continued on front page F-term (reference) 2F063 AA02 AA14 AA16 AA41 BA30 BC09 BD17 DA01 DA05 DB01 DB04 DD06 EB21 HA03 HA04 3E041 AA01 AA02 AA09 BA04 BB08 BC06 CA01 DB07 EA01 3F048 AB01 AB03 BA11 BA12 DB13 BA14 DB10 DB11 DC18 EB22

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 紙葉類の搬送路に設けられた対向電極間
の静電容量の変化により、前記搬送路を搬送される紙葉
類の状態を判別する紙葉類判別装置において、 前記対向電極を構成する各電極の対向面の少なくとも縁
部を斜面若しくは曲面状としたことを特徴とする紙葉類
判別装置。
1. A sheet discriminating apparatus for discriminating a state of a sheet conveyed along a conveyance path based on a change in capacitance between opposing electrodes provided on the sheet conveyance path. A paper sheet discriminating apparatus, wherein at least an edge of a facing surface of each electrode constituting an electrode has a slope or a curved surface.
【請求項2】 前記対向電極を構成する各電極は、 誘電体で被覆された誘電体被覆電極であることを特徴と
する請求項1記載の紙葉類判別装置。
2. The paper sheet discriminating apparatus according to claim 1, wherein each of the electrodes constituting the counter electrode is a dielectric covered electrode covered with a dielectric.
【請求項3】 前記対向電極を構成する各電極は、 前記対向面を底面とする円柱状電極若しくは角柱状電極
であることを特徴とする請求項1又は2記載の紙葉類判
別装置。
3. The paper sheet discriminating apparatus according to claim 1, wherein each of the electrodes constituting the opposing electrode is a columnar electrode or a prismatic electrode having the opposing surface as a bottom surface.
【請求項4】 前記対向電極は、前記搬送路に前記紙葉
類の搬送方向と直交する方向に複数配列されたアレイ状
電極であることを特徴とする請求項1乃至3のいずれか
に記載の紙葉類判別装置。
4. The apparatus according to claim 1, wherein the counter electrode is an array of electrodes arranged in the transport path in a direction perpendicular to a transport direction of the paper sheet. Paper sheet discriminating device.
【請求項5】 前記対向電極間の静電容量を検出する静
電容量検出手段と、 前記静電容量検出手段が検出した静電容量の変化に基づ
いて前記紙葉類の状態を判別する判別手段とを具備する
ことを特徴とする請求項1乃至4のいずれかに記載の紙
葉類判別装置。
5. A capacitance detecting means for detecting a capacitance between the opposed electrodes, and a discrimination for discriminating a state of the sheet based on a change in the capacitance detected by the capacitance detecting means. The paper sheet discriminating apparatus according to any one of claims 1 to 4, further comprising means.
JP2000059217A 2000-03-03 2000-03-03 Paper sheet discrimination device Expired - Fee Related JP3755798B2 (en)

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