JP2012047685A - Magnetic sensor device and read discrimination apparatus employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic sensor device which covers a read region, highly accurately detects magnetic information of paper sheets being conveyed and is capable of discriminating the truth/false of paper sheets, and a read discrimination apparatus employing the same.SOLUTION: A magnetic sensor device includes a plate-like casing, a reading medium, a substrate, a coil and a semiconductor chip. In the plate-like casing, a slit is provided on an insertion-side side wall, an opposed ejection side is made into open end and the plate-like casing internally has a hollow portion. The substrate is placed inside the open end portion of one plate wall on which the hollow portion of the casing is formed for conveying the reading medium, and in the substrate, a magnetic-sensitive element and an output terminal are pattern-formed in parallel with the slit. The coil is formed by winding a conductor having insulation on the surface along the slit in a portion excluding an open end of another plate wall in which the hollow portion of the casing is formed and by applying a DC voltage to the conductor to generate a magnetic field between the open ends of the one plate wall and the other plate wall. The semiconductor chip comprises a shift register circuit and an analog switch circuit being electrically connected with the output terminal of the substrate and sequentially detecting a resistance value change of the magnetic-sensitive element via a common line.

Description

The present invention relates to a magnetic sensor device that reads or authenticates information such as a magnetic card and a bill, and a reading discrimination device using the same.

2. Description of the Related Art Magnetic sensors and identification devices that identify magnetic recording information such as banknotes coated with magnetic ink and magnetic cards containing a magnetic layer are widely used. For example, in FIG. 1 of JP-A-8-105950 (see Patent Document 1), a permanent magnet is provided on the yoke side, and the magnetic field of the permanent magnet is dispersedly radiated from one side of the scanning path through the yoke. There is disclosed a magnetic sensor device configured to detect this with a magnetoresistive element on the opposite side of the scanning path.

In FIG. 8 (see Patent Document 2) of Japanese Patent Laid-Open No. 2000-105847, a high-frequency current is separately applied to the magnetic detection units 16A and 16B, and each of the magnetic detection units 16A and 16B is detected by the detection circuits 54A and 54B. Disclosed is signal processing of a magnetic sensor that takes out a change in amplitude of a voltage with respect to an external magnetic field from both ends as a signal and differentially amplifies the two signals by a low-gain DC differential amplifier 56 to obtain a post-detection output Vs. Yes.

In paragraph [0013] of Japanese Patent Laid-Open No. 9-18068 (see Patent Document 3), the X-direction resistor 14 having resistance to the X-direction magnetic field lines and the Y-direction resistance body 13 having resistance to the Y-direction magnetic field lines contain ferrite powder. A magnetically sensitive device having a thick film formed by printing paste is disclosed.

FIG. 4 (see Patent Document 4) of Japanese Patent Laid-Open No. 2001-60308 is a bulk magnetoresistive material that can be applied to a magnetic head, a magnetic sensor, etc. by mechanically alloying iron powder and magnetite powder, A resistor whose resistance changes by about 1.2% is disclosed.

In FIG. 5, paragraph 0036 (see Patent Document 5) of JP-A-8-293426, an oxide thin film 17 formed of a solution 13 in which a lanthanum ethoxide / strontium isopropoxide solution 11 and a manganese acetate solution 12 are mixed is manufactured. A magnetoresistive effect element manufacturing method is disclosed in which the magnetoresistive effect element 19 has a magnetoresistance change rate (ΔR / R ₀ ) at 300 K of −50%.

FIG. 6 (see Patent Document 6) of Japanese Patent Laid-Open No. 2007-164293 discloses a magnetic detection device 601 that detects magnetic information in a predetermined region of the printed matter 103b and a magnetic signal detection device 602 that detects the output of the magnetic detection device 601. An image sensor 603 that reads the barcode 106 (see FIG. 1), a barcode reader 604 that converts the output (barcode data) of the image sensor 603 into comparison data, and output data and a bar of the magnetic signal detector 602. A data comparison unit 605 that compares the output data of the code reading device 604 and determines whether or not they match, and a reading device that includes a conveyance system that conveys a sheet to be read are disclosed.

FIG. 1 (see Patent Document 7) of Japanese Patent Laid-Open No. 9-284645 discloses transport means 4 and 16 for transporting a film having a magnetic storage unit, illumination means 10a for illuminating the film on the film transport path, and on the film transport path. The image reading means 21 that receives the illumination light of the illumination means 10a through the film and reads the image in the image storage area, and the information in the magnetic storage section from the reading position of the image reading means 21 to the transport path of the transport means 4 and 16 An image reading apparatus provided with magnetic sensors 25a and 25b for reading is disclosed.

JP-A-8-105950 (FIG. 1) JP 2000-105847 A (FIG. 8) JP-A-9-18068 (paragraph 0013) JP 2001-60308 A (FIG. 4) JP-A-8-293426 (FIG. 5, paragraph 0036) JP 2007-164293 A (FIG. 6) JP-A-9-284645 (FIG. 1)

However, the device described in Patent Document 1 is opposed to the magnetoresistive elements 2a and 2b with the scanning path 5 sandwiched between the one having the L-shaped yoke 10 fixed to the lower surface side of the permanent magnet 1 facing the scanning path 5. Since the magnetic field diverging from the N pole side of the permanent magnet 1 is returned from the loop magnetic field on the S pole side, the detection value of the information bit 13 is not correct due to the change in the external environment of the loop path. There is a problem of becoming stable.

Although the thing of patent document 2 applies the high frequency current to the magnetic detection parts 16A and 16B of the magnetic sensor 34, the detection output is taken out and amplified by the differential amplifier 56, the temperature and capacitance change of the detection circuit There is a problem that a highly accurate differential amplification output cannot be obtained due to the influence of the above.

In the device described in Patent Document 3, although the resistors 13 and 14 are formed in a thick film by a printing paste containing ferrite powder, a specific manufacturing method is not mentioned.

The material described in Patent Document 4 is a bulk magnetoresistive material dispersed in a matrix, and since there is no limit on the thickness, it is effective for a magnetic head, a magnetic sensor, etc. The structure is not mentioned.

The thing of patent document 5 was used for the magnetic sensor of what can implement | achieve the magnetoresistive effect element using the La- (Ca, Sr) -Mn-O type | system | group perovskite oxide material which has a very large magnetoresistive change rate. The specific structure of the case is not mentioned.

Since the magnetic identification information in the magnetic signal detection device 602 and the print identification information in the barcode reading device are different types of information described in Patent Document 6, it is possible to accurately determine the authenticity of a specific area to be detected. There is a problem that is not suitable.

In the apparatus disclosed in Patent Document 7, the image reading means 21 and the magnetic sensor 25a are arranged on the conveying path of the conveying means 4 and 16, and the image reading means 21 and the magnetic sensor 25a are controlled independently via the microcomputer 2. As a result, signal processing becomes complicated, and there is a problem that it is difficult to determine authenticity with high accuracy in the same region.

The present invention has been made to solve the above-described problems, and can cover a reading area, detect magnetic information of a conveyed paper sheet with high accuracy, and determine the authenticity of the paper sheet. It is an object of the present invention to provide a magnetic sensor device and a reading discrimination device using the same.

In the magnetic sensor device according to the first aspect of the present invention, a slit portion is provided over a reading width on a side wall on the insertion side or a flat plate wall orthogonal to the side wall, the opposite discharge side is an open end portion, and a hollow portion is formed inside. A housing made of a flat plate-like magnetic body, a reading medium that has a magnetic region, is inserted through the slit portion, and is discharged from the opening end, and a hollow of the housing in which the reading medium is conveyed A plurality of magnetic sensing elements that are placed inside the opening end portion of one flat plate wall that forms a portion and whose resistance value changes in parallel with the slit portion by a magnetic field and their output terminals; In addition, a conductor having an insulating surface along the slit portion is wound around a part of the other flat plate wall other than the opening end portion forming the hollow portion of the casing, and a DC voltage is applied to the conductor. The one flat plate wall and the one A coil for generating a magnetic field between the opening end of the flat plate wall and the output terminal of the substrate, and sequentially detecting each individual resistance value change of the magnetic sensing element through a common line And a semiconductor chip composed of an analog switch circuit.

The magnetic sensor device according to a second aspect of the present invention is the magnetic sensor device according to the first aspect, wherein the conductor having an insulating surface is a flexible substrate in which conductive patterns arranged in parallel with each other are covered with polyimide or a solder resist material. .

The magnetic sensor device according to a third aspect of the present invention is the magnetic sensor device according to the first or second aspect, wherein the one flat plate wall and the other flat plate wall are joined by the side wall on the insertion side.

The magnetic sensor device according to a fourth aspect of the present invention is the magnetic sensor device according to any one of the first to third aspects, wherein the substrate is a ferromagnetic metal substrate whose surface to be patterned is insulated. .

The magnetic sensor device according to a fifth aspect of the present invention is the magnetic sensor device according to any one of the first to fourth aspects, wherein each of the magnetic sensing elements has a pair of a vertically long meander shape pattern and a horizontally long meander shape pattern, each having the output terminal. Any one of the items.

According to a sixth aspect of the present invention, there is provided a magnetic sensor device comprising: a slit portion extending over a reading width on a side wall on the insertion side or a flat plate wall orthogonal to the side wall; the opposite discharge side as an opening end portion; A housing made of a flat plate-like magnetic body, a reading medium that has a magnetic region, is inserted through the slit portion, and is discharged from the opening end, and a hollow of the housing in which the reading medium is conveyed A plurality of magnetic sensing elements that are placed inside the opening end portion of one flat plate wall that forms a portion and whose resistance value changes in parallel with the slit portion by a magnetic field and their output terminals; , Placed on the outside of one or the other flat plate wall forming the hollow portion of the housing along the slit portion, and generates a magnetic field between the open end portions of the one flat plate wall and the other flat plate wall Magnet to be used and in front of the substrate Output terminal and is electrically connected, in which a semiconductor chip comprising a shift register circuit and the analog switch circuit for continuously detecting the respective resistance change of the magnetic sensing element via a common line.

The magnetic sensor device according to a seventh aspect of the present invention is the magnetic sensor device according to the sixth aspect, wherein the magnet extends to an open end of the other flat plate wall.

The magnetic sensor device according to an eighth aspect of the present invention is the magnetic sensor device according to the sixth or seventh aspect, wherein the one flat plate wall and the other flat plate wall are joined by the side wall on the insertion side.

The magnetic sensor device according to a ninth aspect of the present invention is the magnetic sensor device according to any one of the sixth to eighth aspects, wherein the substrate is a ferromagnetic metal substrate whose surface to be patterned is insulated. .
According to a tenth aspect of the present invention, there is provided the magnetic sensor device according to any one of the sixth to ninth aspects, wherein each of the magnetic sensing elements is formed of a pair of a vertically long meander shape pattern and a horizontally long meander shape pattern, each having the output terminal. Any one of the items.

  According to an eleventh aspect of the present invention, there is provided a reading discriminating apparatus, a conveying means for conveying a reading medium having a magnetic region in a conveying direction, a light source for irradiating light to a reading position of the conveyed reading medium, and reflection from the reading position. A lens array that converges light or transmitted light, and a first shift register that receives light converged by the lens array and continuously detects each photoelectrically converted voltage with a shift pulse via a first common line A sensor IC having a circuit and a first analog switch circuit; and a sensor IC that is arranged at a predetermined distance from the reading position in the transport direction and that changes the individual resistance values of the magnetically sensitive elements by a magnetic field via a second common line. Semiconductor chip having a second shift register circuit and a second analog switch circuit that continuously detect with a shift pulse synchronized with the shift pulse of It is obtained by a magnetic sensor device equipped with up.

According to a twelfth aspect of the present invention, there is provided the reading discriminating apparatus according to the eleventh aspect, wherein the shift pulse of the sensor IC and the shift pulse of the semiconductor chip are shifted in synchronization with the same clock signal.

According to the magnetic sensor device of the present invention, the reading medium 1 is inserted from the slit portion on one end side of the casing provided with the hollow portion inside, and the reading medium 1 is discharged from the opening end portion on the other end side facing the housing. A magnetic sensing element is installed inside the flat plate wall that forms the hollow wall surface, and a magnet is placed on the flat plate wall to apply a magnetic field to the gap at the open end of the flat plate wall to detect changes in the resistance value of the magnetic sensing element. Therefore, a thin magnetic sensor device capable of storing circuit components inside the flat magnet can be obtained.

Further, according to the reading discrimination device using the magnetic sensor device according to the present invention, since the magnetic sensor device and the CIS (contact image sensor) are used in conjunction with a common input signal, reading with high authenticity discrimination accuracy is performed. There is an effect of obtaining a discrimination device.

1 is a perspective view of a magnetic sensor device according to Embodiment 1 of the present invention. It is a side view near the reading width direction center part of the magnetic sensor apparatus by Embodiment 1 of this invention. It is a top view of the magnetic sensor apparatus by Embodiment 1 of this invention. It is a top view explaining the relationship between the board | substrate 5 and the signal board | substrate 7 of the magnetic sensor apparatus by Embodiment 1 of this invention. FIG. 5A is a plan view for explaining a magnetic sensing element 4 and a wiring pattern that form a pattern on a substrate 5 of the magnetic sensor device according to Embodiment 1 of the present invention. FIG. FIG. 5B shows a case where the magnetic sensing element is formed in a continuous belt shape. It is a figure explaining one Example at the time of forming the magnetic sensing element 4 patterned in the board | substrate 5 of the magnetic sensor apparatus by Embodiment 1 of this invention by double density. 1 is a circuit diagram of an example of a magnetic sensor device according to Embodiment 1 of the present invention. FIG. It is a timing chart of one Example of the magnetic sensor apparatus by Embodiment 1 of this invention. FIGS. 9A and 9B are diagrams illustrating a case where a differential amplifier is used in place of the comparator 16 used in the magnetic sensor device according to the first embodiment of the present invention. FIG. 9A is a circuit diagram, and FIG. It is a figure explaining determination. It is a top view of the semiconductor chip mounted in the magnetic sensor apparatus by Embodiment 1 of this invention. FIG. 11A is a manufacturing flow of a substrate manufacturing process of the magnetic sensor device according to the first embodiment of the present invention, FIG. 11A is a substrate metallizing process, FIG. 11B is a photolithography process, and FIG. 11C is a magnetic sensing element. 11D is a voltage pulse trimming process, FIG. 11E is a protective film printing / firing process, FIG. 11F is a semiconductor chip mounting (D / B) process, FIG. g) shows a wire bonding (W / B) process, and FIG. 11 (h) shows a sealing process. It is a figure explaining the resistance value change at the time of giving a magnetic field to the magnetic sensing element 4. FIG. It is a figure explaining the glass material for performing resistance value adjustment by ruthenium oxide powder and ferrite powder, and voltage pulse trimming. It is a side view of the reading discrimination | determination apparatus by Embodiment 1 of this invention. It is a top view of the reading discrimination | determination apparatus by Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a read discrimination device equipped with a magnetic sensor device and a CIS according to Embodiment 1 of the present invention. It is a timing diagram of the power supply drive circuit of the reading discrimination | determination apparatus carrying the magnetic sensor apparatus and CIS by Embodiment 1 of this invention. It is a timing diagram of the power supply drive circuit of the reading discrimination | determination apparatus carrying the magnetic sensor apparatus and CIS by Embodiment 1 of this invention. It is an internal circuit diagram of the sensor IC of CIS added to the reading discrimination | determination apparatus by Embodiment 1 of this invention. It is a figure explaining the collation method of the coincidence data A of the magnetic sensor 20. FIG. It is a figure explaining collation with line map data. FIGS. 22A and 22B are diagrams in which the housing 2 has a separation structure, and the upper housing 2d and the lower housing 2e are connected to each other, FIG. 22A shows a case where the slits are connected, and FIG. The case where the body 2 is made into a flat plate and joined together is shown. It is a figure explaining the case where it replaces with an electromagnet and the permanent magnet 36 for exclusive use is installed, FIG. 23 (a) shows the case where a yoke plate is not used, FIG.23 (b) shows the case where a yoke plate is used. . It is a top view explaining arrangement | positioning of the magnetic sensing element of the magnetic sensor apparatus by Embodiment 2 of this invention. It is a circuit diagram of the magnetic sensor apparatus by Embodiment 2 of this invention. It is a timing chart of the magnetic sensor apparatus by Embodiment 2 of this invention. It is a figure explaining the resistance value change of the magnetic sensing element 40 of the magnetic sensor apparatus by Embodiment 2 of this invention. It is a top view of the semiconductor chip mounted in the magnetic sensor apparatus by Embodiment 2 of this invention. It is a figure explaining the electromagnet part of the magnetic sensor apparatus by Embodiment 3 of this invention, Fig.29 (a) is a top view of a flexible substrate, FIG.29 (b) is the elements on larger scale of a flexible substrate, FIG.29 (c) ) Indicates how to wind the flexible substrate. It is a side view near the reading width direction center part of the magnetic sensor apparatus by Embodiment 4 of this invention. It is a side view near the reading width direction center part of the magnetic sensor apparatus by Embodiment 5 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIG. 1 is a perspective view of a magnetic sensor device according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a magnetic detection object (reading medium) such as a bill or a magnetic card on which magnetic ink is applied or printed, and is conveyed by a conveying means such as a roller in the conveying direction. .

Reference numeral 2 denotes a flat-plate case in which a hollow space is formed by a flat plate wall connected to a side wall by bending a flat plate material of a ferromagnetic material such as soft iron, annealed iron plate, or permalloy, and 2a is a bent case 2 A projecting portion provided with an open end projecting inward, 2b is a flat portion corresponding to one flat plate wall end portion of the housing 2 facing the projecting portion 2a, and 2c is a folded side wall of the housing 2 A slit portion 3 for inserting the reading medium 1 formed by cutting out a part of the reading medium 1 over the reading width of the reading medium 1, except for the protrusion 2 a provided at the other flat plate wall end of the housing 2, A coil for an electromagnet (winding wire) that wraps an enameled wire with a diameter of about 0.25 mm or a coated conductor (conductor wire) around the flat plate wall in the reading width direction (main scanning direction) to generate a magnetic field ).

Therefore, by applying a DC voltage to the coil 3, the N pole and S pole of the magnetic field are formed on both sides of the coil 3, and the protrusion provided on the flat plate wall of the housing 2 that is the end (opening end) A substantially perpendicular magnetic field is generated with respect to the conveying direction between the flat portion 2b at one flat plate wall end facing the portion 2a. The reading medium 1 inserted from the slit 2c passes through the vertical magnetic field and is discharged from the gap at the opening end. In addition, the housing | casing 2 which wound the coil 3 for convenience is called an electromagnet.

Reference numeral 4 denotes a patterned magnetic sensing element which is arranged in an array in the reading width direction on one end of the flat plate wall of the housing 2 and detects the magnetization component of the reading medium 1.

5 is a ceramic substrate on which the surface on which the magnetic sensing element 4 is formed is coated with glass, or a ferromagnetic material on which the surface on which the magnetic sensing element 4 is formed on the upper layer is insulated with enamel or glass material. It is a substrate that is made of a metal plate (hollow substrate) and is placed inside one end of the flat plate wall of the housing 2. The magnetic sensing element 4 is patterned on the substrate 5 and the output terminal of the magnetic sensing element 4 Is formed.

6 is a semiconductor chip (integrated shift register circuit, analog switch circuit, etc.) that sequentially outputs the resistance value information of the magnetic sensing elements 4 arranged in an array via a common line (common line). A data driver (7) is a signal processing board (signal board) constituted by a printed wiring board or the like, and a semiconductor chip 6 is mounted on the signal board 7. Reference numeral 8 is an input / output connector for supplying input / output signals to and power from the semiconductor chip 6 and the substrate 5, and 9 is an electromagnet connector for supplying power to the coil 3.

FIG. 2 is a side view of the magnetic sensor device according to the first embodiment of the present invention near the center in the reading width direction. In FIG. 2, 10 is a signal processing IC for calculating and collating the digitally converted signal of the magnetic sensing element 4, 11 is a connection means such as a gold wire for wiring connection, and 11a is a substrate 5 and a semiconductor chip. Reference numeral 11 b denotes connection means between the semiconductor chip 6 and the signal substrate 7. 12 is a cap or a resin-molded protective member for protecting the connection means 11, 13 is a magnetic shield sheet having a thickness of 0.15 to 0.2 mm using an amorphous magnetic shield material such as nickel or cobalt (Co), and 14 is a reading medium. 1 is a buffer member using a magnetic shield material that secures one conveyance path. Therefore, the reading medium 1 that passes through the hollow portion of the housing 2 has a gap between the buffer member 14 provided on one flat plate wall side of the housing 2 and the magnetic shield sheet 13 provided on the other flat plate wall side. It is discharged from the end side of the housing 2 as a passage route.

FIG. 3 is a plan view of the magnetic sensor device according to Embodiment 1 of the present invention. The reading medium 1 is coated or laminated with magnetic ink, and in a banknote or the like, there is a region where the magnetic ink is coated on characters and designs. In the case of banknotes, since the reading width is up to about 160 mm, the longitudinal size is set to about 200 mm according to the reading width of the magnetic sensor device. However, when the area of the magnetic ink application area of the reading medium 1 is small, the longitudinal size is set. May be combined with the short-side size of 30 mm, and if there is a margin in the transport direction (sub-scanning direction), the short-side size may be made larger than the long-side size in order to increase the number of turns of the coil 3. good. 1-3, the same code | symbol shows the same or an equivalent part.

FIG. 4 is a plan view for explaining the relationship between the substrate 5 and the signal substrate 7 of the magnetic sensor device according to the first embodiment of the present invention. In FIG. 4, reference numeral 15 denotes an area of the signal board 7 on which the discrete electronic components are installed except for the semiconductor chip 6. The substrate 5 and the signal substrate 7 are separated, and the semiconductor chip 6 is disposed on the signal substrate 7 side so as to face the substrate 5. Delivery of signal wiring to the semiconductor chip 6 is performed by the connecting means 11. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

FIG. 5 is a plan view for explaining the magnetic sensing element 4 and the wiring pattern for pattern formation on the substrate 5 of the magnetic sensor device according to the first embodiment of the present invention. FIG. In the case of the configuration, FIG. 5B shows the case where the magnetic sensing element 4 has a continuous band configuration. In FIG. 5, 5a is a common electrode pattern for applying a potential to the magnetic sensing element 4, 5b is an individual electrode pattern facing the common electrode pattern, and 5c is a lead pattern for wiring the output of the magnetic sensing element 4 to an output terminal. Each element of the magnetic sensing element 4 is linearly arranged in an array in the reading width direction at a density of 0.25 mm (4 dots / mm) × 0.33 mm (3 dots / mm).

In FIG. 5, the common electrode pattern 5a, the individual electrode pattern 5b, and the lead pattern 5c are metallized after the formation of the magnetic sensing element 4 and then etched to form a pattern for the magnetic sensing element 4 having an independent dot configuration or a continuous strip configuration. It shows what has become. Therefore, the connection portion of the electrode pattern 5 is formed on the magnetic sensing element 4. In the figure, the same reference numerals as those in FIG. 4 denote the same or corresponding parts.

FIG. 6 is a diagram for explaining an example when the magnetic sensing elements 4 for pattern formation are formed at double density on the substrate 5 of the magnetic sensor device according to the first embodiment of the present invention. In FIG. 6, 5 d is a wide ground pattern provided on the end side of the substrate 5, 6 a is an element side connection electrode pad of the semiconductor chip 6, and 6 b is an element side connection electrode via the drive circuit region of the semiconductor chip 6. This is a signal side connection electrode pad of the semiconductor chip 6 provided on the opposite side of the pad 6a. In FIG. 6, the elements of the magnetic sensing element 4 are formed at double density for each dot, one end of the magnetic sensing element 4 is connected to the common electrode 5a, the other end is connected to the ground, and a lead pattern is drawn from the middle point of the element. The output terminal configuration is drawn out. Further, the electrode pads 6a of the semiconductor chip 6 are made denser than the configuration density of the magnetic sensing element 4, and the semiconductor chip 6 is shrunk. In the figure, the same reference numerals as those in FIG. 5 denote the same or corresponding parts.

Next, the operation will be described. The magnetic sensing element 4 having the configuration shown in FIG. 5 outputs the change in resistance value as an absolute value from the output terminal. Since the magnetic sensing element 4 shown in FIG. 6 detects a change in resistance value from the midpoint of the element, this case will be described.

FIG. 7 is a circuit diagram of an example of the magnetic sensor device according to the first embodiment of the present invention. In FIG. 7, 4a is one element magnetic sensing element (element A), 4b is the other element magnetic sensing element (element B), 6c is a shift register composed of flip-flops for sequentially shifting data, and 6d is a shift register. An analog switch that sequentially opens and closes the switch based on the data of 6c, 6e is a common line through which the signal output of the magnetic sensing element 4 passes, 16 is a comparator that compares the potential output from the common line 6e with a reference potential, and 17 is a reference A variable resistor for voltage division constituting the potential, 18 is an input changeover switch for switching the reference potential and the potential of the common line 6e to input to the comparator, and 19 is a high impedance [H] output other than the reading effective section. It is a buffer circuit. In FIG. 7, the comparator 16 and the like are installed outside the semiconductor chip 6. However, the input changeover switch 18 and the buffer circuit 19 including the comparator 16 are provided inside the semiconductor chip 6 and output for each semiconductor chip 6. May be divided.

First, a magnetic field is generated in the coil 3, and the magnetic sensing element 4 changes from the initial resistance value due to the Lorentz force. Since the elements A and B of the magnetic sensing element 4 are arranged close to each other and the output is taken out from the neutral point even if the initial resistance value changes, when the power supply voltage is 5 V, 2.5 V Become. This potential is input to the common line 6e when the analog switch 6d is closed. The shift register 6c is operated by shifting the shift pulse of the start signal (SI) synchronized with the clock signal (CLK) so that the analog switches 6d are sequentially opened and closed. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

FIG. 8 is a timing chart of an example of the magnetic sensor device according to the first embodiment of the present invention. For the common line 6e, the analog switch 6d is closed at the fall of the CLK signal, and the analog switch 6d is sequentially opened and closed until detection (reading) of one line is completed. In the H period of the clock signal, the input of the comparator 16 is set to the same voltage, and a sampling voltage sampling period is provided. Sampling is performed within the effective reading period. The output of the comparator 16 is input to the next stage sampling circuit. In the sampling circuit (not shown), the output (Vout) of the comparator 16 and the CLK signal are synchronized, and the potential is extracted from the middle of the Vout interval of the comparator 16 to make a binary decision. Further, instead of the comparator 16, it may be used as a differential amplifier as shown in FIG. 9A. In this case, since the detection voltage of Vout changes as shown in FIG. Multi-valued determination is made with a digital comparator of about 12 bits.

FIG. 10 is a plan view of a semiconductor chip mounted on the magnetic sensor device according to the first embodiment of the present invention.
In FIG. 10, SI is a start input terminal for inputting a start signal for each line in synchronization with the clock signal, CLK is a clock input terminal for inputting continuous pulses, and SIG outputs a detection signal for a change in resistance value. A signal output terminal, SO is an output terminal for connecting the next stage of the start signal (SI) for shifting in the semiconductor chip 6, VDD is a power supply terminal, and GND is a ground terminal. The semiconductor chip 6 is a staggered 96-bit signal input terminal (element-side connection electrode pad) 6a when the magnetic sensing elements 4 are densely arranged, and a straight line when the density is low. The 96-bit signal input terminal (element-side connection electrode pad) 6a is arranged. When the size of each semiconductor chip 6 is 20 mm, the pitch between the signal input terminals is about 0.2 mm.

Next, the manufacturing method of the board | substrate 5 and the signal board | substrate 7 is demonstrated using FIG. FIG. 11 is a manufacturing flow of the substrate manufacturing process of the magnetic sensor device according to the first embodiment of the present invention. FIG. 11 (a) is a substrate metallizing process, FIG. 11 (b) is a photolithography process, and FIG. 11 (c). FIG. 11D is a voltage pulse trimming process, FIG. 11E is a protective film printing / firing process, and FIG. 11F is a semiconductor chip mounting (D / B) process. FIG. 11G shows a wire bonding (W / B) process, and FIG. 11H shows a sealing process. First, an organic gold paste is applied to the entire surface of a ceramic substrate whose surface is glass-coated, and a gold film having a thickness of about 0.5 μm is formed after firing.

Next, photoengraving is performed using a desired mask using sub-steps such as exposure, development, and peeling. Next, a magnetic sensitive material containing ruthenium oxide containing a pasted magnetic ink material as a main raw material is applied to a predetermined region, and then fired.

Next, a gradually increasing high voltage voltage pulse is applied between the common electrode pattern 5a connected to each element of the magnetic sensing element 4 and the individual electrode pattern 5b, and the resistance value of the element of the magnetic sensing element 4 gradually decreasing is 3000Ω ±. Continue until 0.5% or less. That is, the application of the voltage pulse is stopped when the resistance value decreases to 3000Ω.

Next, a glass material is applied to the peripheral pattern to be protected including the magnetic sensing element 4 and then baked to form a protective film.

Next, the semiconductor chip 6 is mounted on the substrate 5 using a die bonding adhesive.

Next, the substrate 5 and the signal substrate 7 are opposed to each other using a flat plate jig (stage), and then a predetermined interval between the predetermined element side connection electrode pad 6a of the semiconductor chip 6 placed on the substrate 5 and the substrate 5 is set. Is wire-bonded with a gold wire 11a. Subsequently, a predetermined gap between a predetermined signal-side connection electrode pad of the semiconductor chip 6 and the signal substrate 7 is wire-bonded with a gold wire 11b.

Next, a magnetic shield sheet 13 is affixed to at least the back surface of the substrate 5 and the signal substrate 7 except for the periphery of the magnetic sensing element 4, and then a resin mold member (protective member) 12 using an epoxy or silicon material is included in the semiconductor chip 6. It is applied to the wire bond region to prevent corrosion of the semiconductor chip 6 and peeling of the connecting means 11. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. Note that the substrate metallization process of FIG. 11A and the photoengraving process of FIG. 11B may be performed as a subsequent process of the printing / firing process of the magnetic sensing element (magnetic resistor) of FIG. 11C. good.

Next, a magnetic sensing element of the magnetic sensor device according to Embodiment 1 of the present invention will be described. FIG. 12 shows a change in resistance value when a magnetic field is applied to the magnetic sensing element 4. Due to the Lorentz force from the magnetic flux density generated by installing the magnetic sensing element 4 in a constant magnetic field, the current path of the magnetic sensing element 4 is bent and a change in resistance value appears. The reading medium 1 on which magnetic ink or the like passing through the magnetic field space is coated or laminated disturbs the surrounding magnetic field by its magnetization or polarization action.

Therefore, the resistance value changes from the initial value in the magnetic field application state. The magnetic sensing element 4 includes a resistance value material (positive characteristic resistance material) whose resistance value increases when a magnetic flux density is applied and a resistance value material (negative characteristic resistance material) whose resistance value decreases. In any case, by making the magnetic flux density relatively high, as shown in FIG. 12, the change in the resistance value may approach a saturated state.

When the moving reading medium 1 approaches the magnetic sensing element 4 and the surrounding magnetic field is disturbed and changes so as to approach the initial value of the original magnetic sensing element 4, the magnetic substance of the reading medium 1 is magnetized. In some cases, a larger magnetic field is applied to the nearby magnetic sensing element 4.

Next, the magnetically sensitive material will be described. In the case of reading a magnetic ink pattern or the like, the purpose is to detect the presence or absence of a pattern, and a commercially available magnetic sensing element may be applied. In the first embodiment, a circuit integrated with the semiconductor chip 6 is used. Since the arrangement is performed, the driving voltage is preferably 10 V or less, and the current is preferably 1 mA or less per gate (element).

Therefore, a ruthenium oxide powder and a ferrite powder as shown in FIG. 13 and a glass material for adjusting a resistance value by voltage pulse trimming, preferably a pulverized lanthanum glass material having a good temperature characteristic, are appropriately mixed and heated. It is preferable to apply a bulk material having a coefficient of about −1000 to −3000 ppm / ° C. to obtain a high resistance value of about 3000Ω with a film thickness after firing of about 10 μm.

Next, a reading discrimination device using a magnetic sensor device will be described. FIG. 14 is a side view for explaining the system layout of the read discrimination apparatus according to Embodiment 1 of the present invention. In FIG. 14, 20 is a magnetic sensor (magnetic sensor device) incorporated in the reading discriminating device, 21 is a conveying means such as a roller or pulley for conveying the reading medium 1, 22 is a paper feeding side cassette, and 23 is a paper discharging side cassette. , 24 is a contact image sensor (CIS) for recognizing the design of the reading medium 1 and characters.

24a is a reflective light source of CIS 24 using a light guide, 24b is a rod lens array that converges light reflected by the reading medium 1 by being irradiated by the reflective light source 24a, and 24c is a light receiving surface for light converged by the rod lens array 24b. A sensor IC that performs image formation and photoelectric conversion, 24d is an ASIC that performs signal processing of the photoelectrically converted signal, 24e is a transparent body that forms an internal sealed space of the CIS 24 and forms a part of the conveyance path of the reading medium 1, Reference numeral 24f denotes an irradiation unit (reading position) of the reading medium 1. A transmissive light source 25 irradiates light mainly on a transmissive portion (watermark portion) of the reading medium 1, and the transmitted light of the transmissive light source 25 is also detected by the sensor IC 24c via the rod lens array 24b and the sensor IC 24c. . In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

FIG. 15 is a plan view of the reading discrimination apparatus according to Embodiment 1 of the present invention. In FIG. 15, 25a is a connector of the transmissive light source 25, 26 is a fixing portion between the magnetic sensor device 20 and the reading discrimination device, and 27 is a fixing portion between the CIS 24 and the reading discrimination device. In the figure, the same reference numerals as those in FIGS. 2 and 14 denote the same or corresponding parts.

Next, the operation of the reading discrimination device using the magnetic sensor device will be described. In the first embodiment, the reading medium 1 such as a banknote has a pattern such as a pattern of a banknote and characters / symbols. Since a magnetic component is often added to the ink material constituting the (design pattern), an example of performing pattern detection and design pattern detection of the magnetic part in the same region will be described.

FIG. 16 is a block diagram of a reading discriminating device equipped with the magnetic sensor device and the CIS according to the first embodiment of the present invention. FIG. 16A shows a signal processing IC on the magnetic sensor device side and a signal processing on the CIS side. FIG. 16B shows a case where the signal processing IC on the magnetic sensor device side is integrated with the ASIC on the CIS side. In FIG. 16A, a magnetic field is generated between the ends of the housing 2 by supplying power to the coil 3 by an electromagnet drive signal (PS) sent from the system main body. When the conveyance speed of the reading medium 1 is a constant speed of 250 mm / sec and the reading position interval (L) is 50 mm apart, the magnetic pattern detected at the magnetic part reading position is the same at the image reading position after 200 ms. Collect pattern image data for the area.

The magnetic detection data detected by the magnetic sensing element 4 is compared with the verification data stored in the ROM or the register in advance by the verification circuit of the signal processing IC 10 via the comparator 16 or the differential amplifier. Is sent out from the A terminal. The image data read at the image reading position is photoelectrically converted by the sensor IC 24c and compared with the verification data stored in the ROM or register in advance by the verification unit of the signal processing circuit on the CIS 24 side. Send from terminal B. Based on the system control (SYC) signal, if both the image data obtained after 200 ms on the system main body side and the magnetic detection data give a coincidence signal, the pattern (image) in that area is determined by the magnetic detection determination and the image determination. Are both true. Note that CNT is a chip select signal that determines the reading width of the semiconductor chip 6 and the sensor IC 24c.

In FIG. 16B, an SI signal and a CLK signal are generated by a synchronization signal generator provided in the ASIC 24d on the CIS 24 side based on the SYC signal, and the semiconductor chip 6 on the magnetic sensor device 20 side and the sensor IC 24c on the CIS 24 side Are driven simultaneously. Thus, by integrating the signal processing IC 10 provided on the magnetic sensor device 20 side with the ASIC 24d on the CIS 24 side, the collation calculation processing is directly performed only within the ASIC 24d, and the signal processing speed and the collation calculation accuracy are improved. Greatly improved

FIG. 17 is a timing diagram of the power supply drive circuit of the read discrimination device equipped with the magnetic sensor device and the CIS according to the first embodiment of the present invention. A magnetic field is generated by the electromagnet drive signal (PS), reading of the magnetic part is started by the magnetic sensor (magnetic sensor device) 20, the pattern pattern is read after 200 ms, and the reflective light source 24a of the CIS 24 is immediately before reading the pattern. Light. At the time of reading the watermark portion, the reflective light source 24 a of the CIS 24 is turned off, and the transmissive light source 25 is turned on by a lighting signal of the transmissive light source 25 of the CIS 24. When the reading medium 1 is conveyed after a certain period, each lighting signal of the CIS 24 repeats the ON / OFF operation at the same timing.

FIG. 18 is a drive timing chart of the read discrimination device equipped with the magnetic sensor device and the CIS according to the first embodiment of the present invention. The reading area of the magnetic sensor 20 and the reading area of the CIS 24 are a clock input signal (CLK) and a start input signal (SI) generated by a system clock signal (SCLK) and a system control signal (SYC) sent from the system body. The semiconductor chip 6 and the sensor IC 24c are driven. The coincidence signals A and B are sent to the discrimination area set for each line. As described above, these series of operations are performed based on instructions from a CPU (Central Processing Unit) mounted on the signal processing IC 10 or the ASIC 24d.

FIG. 19 is an internal circuit diagram of a CIS sensor IC mounted in the reading discrimination apparatus according to Embodiment 1 of the present invention. In FIG. 19, 30 is a light receiving portion (photoelectric conversion element) of a sensor IC 24c that receives light and performs photoelectric conversion, 31 is a shift register circuit, 32 is an analog switch, 33 is a common line, and 34 is a common line 33 for each CLK signal. Is an analog switch for temporarily resetting, and an amplifier 35 amplifies the analog signal. The shift register circuit 31 has the same configuration as the shift register of the magnetic sensor 20. That is, the SI signal and CLK signal to be driven are synchronized with the SI signal and CLK signal of the magnetic sensor 20.

Next, a matching method of the coincidence data A of the magnetic sensor 20 will be described. When the reading size of the reading medium 1 is 192 mm and the value obtained by reading the data for each line (n) is a map as shown in FIG. 20, it is compared with data stored in a storage element (ROM) or the like in advance. As shown in FIG. 21, 1 is stored as line map data when they match, and 0 is stored as line map data when they do not match. To do. In this embodiment, the magnetic sensor 20 is installed on the upstream side in the transport direction and the CIS 24 is installed on the downstream side in the transport direction, but it may be installed reversibly.

As described above, the magnetic sensor device according to the first embodiment is configured such that the reading medium 1 is inserted through the slit on the side wall on the one end side of the plate-shaped housing having a hollow portion therein as shown in FIG. A flat plate wall having a structure in which the reading medium 1 is discharged from the opening end on the end side, a magnetic sensing element is provided inside a flat plate wall forming one hollow wall surface constituting the housing, and the other hollow wall surface facing the other is formed A magnet is installed in the plate, and a magnetic field is applied to the gap between the open end of one flat plate wall and the open end of the other flat plate wall to detect a change in the resistance value of the magnetic sensing element. Components can be accommodated, and a thin magnetic sensor device can be obtained. Further, since the magnetic sensor device and the CIS are used in conjunction with a common input signal, there is an effect of obtaining a reading discriminating device with high authenticity discrimination accuracy such as a magnetic pattern.

Further, by using a ferromagnetic metal substrate for the substrate 5, the magnetization direction of the flat portion 2b is expanded, the distance between the opening end portions of the projection 2a and the flat portion 2b of the housing 2 is shortened, and the detection sensitivity is improved. There is an effect of obtaining a high output from the magnetic sensing element 4.

In the first embodiment, the housing 2 has an integral structure. However, as shown in FIG. 22A, the housing 2 has a lower housing (a housing portion having one flat plate wall) with the slit portion 2c as a boundary. 2d and the upper casing (the casing portion having the other flat plate wall) 2e are separated from each other, and the lower casing 2d and the upper casing 2e are mutually bonded by silver brazing using welding or a magnetic component so as not to polarize. You can join them together.

Further, as shown in FIG. 22B, the housing 2 may have a separation structure with the lower housing 2d as a flat plate, or may have a separation structure with the upper housing 2e as a flat plate.

In the first embodiment, the coil 3 is wound around the casing 2 to form an electromagnet. However, the magnetized casing 2 may be used as a permanent magnet. For applications where the magnetic flux density is as small as about 100 mT, FIG. As shown in a), one or more dedicated permanent magnets 36 may be installed on the outer side of one or the other flat plate wall of the housing 2 along the slit portion 2c.

Further, as shown in FIG. 23 (b), the casing 2 is shortened, and a yoke plate 37 made of soft iron is bent and attached to the upper surface of the permanent magnet 36 instead of the protrusion 2a, and the bent portions are opposed to each other. By using the projection 2a of the housing 2 with respect to the flat portion 2b to be detected, when the reading medium 1 is relatively thin and rough area detection, a corresponding effect can be obtained in performing the reading discrimination even if the permanent magnet 36 is used. is there. 22 and 23, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

Embodiment 2. FIG.
In the first embodiment, the current flowing from the common electrode pattern 5a to the individual electrode pattern 5b flows in the magnetic sensing element 4 in one direction of the reading width direction or the transport direction. However, in the second embodiment, A case will be described in which the current of each element flowing in the magnetic sensing element mainly flows in different directions. The length of the magnetically sensitive element is L, the width is W, the specific resistance is ρ0, the initial resistance value is R0, the specific resistance of the magnetically sensitive element when the magnetic flux density is B is ρS, and the resistance value is RS, When the mobility of flowing electrons is m, RS is expressed by the following equation.

RS = R0 × ρS / ρ0 × {(1+ (L / W) × (mB) ² )

The surrounding magnetic field is disturbed by the magnetization or polarization of the magnetic ink of the reading medium 1 passing across the magnetic field, and the specific resistance ρS of the magnetic sensing element 4 changes. FIG. 24 is a plan view for explaining the arrangement of the magnetic sensing elements of the magnetic sensor device according to Embodiment 2 of the present invention. In FIG. 24, 40a is one element magnetic sensing element (MRMn), and 40b is the other element magnetic sensing element (MRn).

For magnetic ink passing through two adjacent magnetic sensing elements 40a and 40b, one element magnetic sensing element (MRMn) 40a having a meander shape is arranged in the transport direction or the reverse transport direction. The current mainly flows toward the other side, and the current flows mainly toward the direction perpendicular to the transport direction in the other element magnetic sensing element (MRn) 40b.

In this embodiment, a case will be described in which the change in the resistance value of the MRMn 40a is smaller than the change in the resistance value of the MRn 40b due to the Lorentz force. Although MRM40a and MRn40b have different arrangement shapes, the total length (L), pattern width (W), initial resistance value (R0) or resistance value (RS) in a magnetic field can be the same for the elongated meander. The difference between the two resistance values is detected. For example, the magnetic flux density to be applied is determined in advance, and the resistance value (RS) in a magnetic field is aligned using the voltage pulse trimming method.

In FIG. 24, MRMn 40a is called a vertically long meander, and MRn 40b is called a horizontally long meander. The longitudinal meander has a lot of Lorentz force applied in the reading width direction, and the horizontal meander has a lot of Lorentz force applied in the transport direction. Therefore, the difference in the resistance value of each element of the magnetic sensing element 40 is calculated using the difference in the arrangement shape. It is possible to detect.

As a method for further improving the detection accuracy by utilizing the difference in the arrangement shape, in order to reduce the resistance value change due to the Lorentz force, the region pattern width (W) of the MRMn 40a in the transport direction or the reverse transport direction is increased. In order to increase the resistance value change due to the Lorentz force, the region pattern width (W) of the MRMn 40b in the direction orthogonal to the transport direction is decreased. Thus, the detection accuracy may be made sensitive by changing not only the arrangement shape but also the meander pattern width (W).

Also, one of the individual elements having a small resistance value change may be used as the monitor side element. Further, detection accuracy can be further improved by detecting the difference value of the resistance value change with respect to the fine magnetic pattern having magnetic anisotropy by using the elements of the longitudinal meander and the laterally meander as a pair.

FIG. 25 is a circuit diagram of a magnetic sensor device according to Embodiment 2 of the present invention. In FIG. 25, 41 is a shift register circuit, 42 is an analog switch circuit, 43 is a common line, 43a is one common line, 43b is the other common line, and 44 is an analog that resets the common line 43 for each CLK signal. A switch 45 is a differential amplifier (differential amplifier circuit) that differentially amplifies two analog signals. The shift register 41 has the same configuration as the shift register 31 of the CIS 24. That is, the start signal (SI signal) and the clock signal (CLK signal) to be driven are synchronized with the SI signal and the CLK signal of the magnetic sensor 20. In the figure, the same reference numerals as those in FIG. 24 denote the same or corresponding parts.

FIG. 26 is a timing chart of the magnetic sensor device according to the second embodiment of the present invention. In the common line 43, the analog switch 42 is closed when the CLK signal (CLK) falls, and the analog switch 42 is sequentially opened and closed until detection (reading) of one line is completed. In the H section of the clock signal, the input of the differential amplifier 45 is set to the same voltage. Thereafter, the output value (Vout) of the differential amplifier 45 is digitally converted.

FIG. 27 is a diagram illustrating a change in resistance value of the magnetic sensing element 40 of the magnetic sensor device according to the second embodiment of the present invention. That is, a magnetic field is applied to the magnetic sensing element 40, and a change in resistance value due to magnetic ink is shown. Due to the Lorentz force due to the magnetic flux density generated by installing the magnetic sensing element 40 in a constant magnetic field, the current path of the magnetic sensing element 40 is bent and a change in resistance value appears. The reading medium 1 coated or laminated with magnetic ink that passes through this magnetic field space disturbs the surrounding magnetic field by its magnetization or polarization action, and analog signals (SIG1, SIG2) of different voltages are applied to the two series of common lines 43. The signal is output, compared by the differential amplifier 45 for each pair or each adjacent element, and the pixel position (element position) is verified by the verification circuit of the signal processing IC 10.

FIG. 28 is a plan view of a semiconductor chip mounted on the magnetic sensor device according to the second embodiment of the present invention. In FIG. 28, 60 is a semiconductor chip (data driver), SI is a start input terminal, CLK is a clock input terminal, SIG1 and SIG2 are signal output terminals, and SO is a signal following the start signal (SI) for shifting in the semiconductor chip 60. An output terminal for stage connection, VDD is a power supply terminal, GND is a ground terminal, and CNT is a chip select input terminal for selecting the semiconductor chip 60. Each semiconductor chip 60 has 192-bit signal input terminals (V +, V−) in a staggered arrangement, V + is connected to the common line 43a of SIG1, and V− is connected to the common line 43b of SIG2. The pitch between adjacent terminals is 0.1 mm. In the figure, the same symbols as those in FIG. 10 indicate the same or corresponding parts.

As described above, according to the magnetic sensor device according to the second embodiment, the change in the resistance value of the magnetic sensing element is detected for each element, so that in addition to the effects described in the first embodiment, with high resolution. Since it detects, it has the effect of obtaining the magnetic sensor apparatus which can make detection accuracy sensitive, and the reading discrimination | determination apparatus using the same.

Note that the structure of the magnetic sensor device described in the second embodiment and the read discrimination device using the magnetic sensor device can be applied in combination with the structure described in the first embodiment.

Embodiment 3 FIG.
In the first embodiment, the electromagnet coil 3 for generating a magnetic field installed in the housing 2 is configured by winding, but in the third embodiment, a case in which it is configured by a flexible substrate will be described. 29A and 29B are diagrams for explaining an electromagnet portion of a magnetic sensor device according to Embodiment 3 of the present invention. FIG. 29A is a plan view of a flexible substrate, and FIG. 29B is a partially enlarged view of the flexible substrate. FIG. 29C shows how to wind the flexible substrate. In FIG. 29 (a), 70 is an elongated flexible flexible substrate using a resin film such as polyimide or solder resist, and 70 (a) is a thin wire formed of rolled copper foil of about 18 μm to 35 μm on the surface of the flexible substrate. A pattern 70b is an electrode pattern (lead terminal).

In this embodiment, the total length of the flexible substrate 70 is 800 mm or more, and the width in the transport direction corresponding to the read medium 1 to be transported is 20 mm except for a part of the lead terminals (70b). The fine line pattern (70a) is sandwiched between polyimide or solder resist material and insulated from the surroundings. The flexible substrate 70 has a total thickness of about 0.25 mm. In FIG. 29B, the thin line pattern 70 (a) is inclined by a minute angle with respect to the longitudinal direction, and a large number of patterns are arranged obliquely in parallel at equal intervals of about 0.1 mm. In FIG. 29 (c), the flexible substrate 70 is inserted from the opening end of the housing 2 and wound twice, so that the outer winding pattern overlaps the pattern gap of the thin line pattern 70 (a) of the overlapping flexible substrate 70. Be placed.

  As described above, according to the third embodiment, the work of winding the coil 3 around the casing 2 can be reduced, so that the electromagnet of the magnetic sensor device 20 can be configured easily.

  In the first to third embodiments, the slit portion 2c of the housing 2 formed by cutting out over the reading width of the magnetic sensor device 20 is obtained by cutting out a part of the bent side wall of the housing 2. As described above, in the fourth embodiment, a case will be described in which the slit portion 2c is provided on the flat plate wall that is connected orthogonally to the side wall of the folded casing 2. In the case where the reading medium 1 is bent such as a bill or a voucher, the conveyance path between the insertion side and the discharge side facing the insertion side does not have to be linear, so the conveyance path in such a case will be described.

Embodiment 4 FIG.
FIG. 30 is a side view of the vicinity of the center in the reading width direction of the magnetic sensor device according to the fourth embodiment of the present invention. In FIG. 30, a slit portion 2 c is provided in a region excluding the coil 3 disposed on the other flat plate wall of the housing 2 connected to the side wall to be a side on which the reading medium 1 is inserted. The reading medium 1 inserted from the slit portion 2c passes through the hollow portion of the housing 2, and the buffer member 14 provided on one flat plate wall side of the housing 2 and the magnetic material provided on the other flat plate wall side. It is discharged from the opening end of the discharge-side casing 2 that passes through the gap with the shield sheet 13 and faces the shield sheet 13.

The magnetic shield sheet 13 and the buffer member 14 constituting the banknote transport path are made of a relatively high hardness obtained by plating or laminating an alloy of nickel (Ni) and tungsten (W) on an amorphous magnetic shield material. , Ensure smoothness and wear resistance to the bills being conveyed. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. Other configurations and operations are the same as those in the first embodiment, and thus the description thereof is omitted.

Embodiment 5 FIG.
FIG. 31 is a side view of the vicinity of the center in the reading width direction of the magnetic sensor device according to the fifth embodiment of the present invention. In FIG. 31, a slit portion 2c is provided on one flat plate wall of the housing 2 connected to the side wall, and the reading medium 1 is inserted. The reading medium 1 inserted from the slit portion 2c passes through the hollow portion of the housing 2, and the buffer member 14 provided on one flat plate wall side of the housing 2 and the magnetic material provided on the other flat plate wall side. It is discharged from the opening end of the discharge-side casing 2 that passes through the gap with the shield sheet 13 and faces the shield sheet 13. In the figure, the same reference numerals as those in FIG. 30 denote the same or corresponding parts. Other configurations and operations are the same as those in the first embodiment, and thus the description thereof is omitted.

From the above, according to the magnetic sensor devices according to the fourth to fifth embodiments, the conveyance path of the reading medium 1 passing through the magnetic sensor apparatus 20 is bent, so that the conveyance path interlocked with the CIS 24 can be shortened. The system configuration of the discrimination device can be performed.

1 .. Object to be detected (reading medium) 2.. Housing 2 a.. Projection of housing 2 b. Flat part 2 c. Slit 2 d. Lower housing 2 e. Coil 4 .. Magnetic sensing element (magnetoresistance element) 4a .. Element A 4b .. Element B
5 .... Substrate 5a ... Common electrode pattern 5b ... Individual electrode pattern 5c ... Lead pattern 5d ... Ground pattern 6 ... Semiconductor chip 6a ... Electrode pad for element side connection 6b ... Electrode for signal side connection Pad 6c .. shift register (second shift register circuit)
6d ・ ・ Analog switch (second analog switch circuit)
6e ·· Common line 7 · · Signal board 8 · · I / O connector 9 · · Electromagnet connector 10 · · Signal processing IC
11. Connection means (conductor wire)
11a ... Element side connection means 11b ... Signal side connection means 12 ... Protective member 13 ... Magnetic shield sheet (tape)
13. · Magnetic shield sheet 14 · · Buffer member 15 · Electronic component installation region 16 · · Comparator 17 · · Variable resistor 18 for voltage division · · Input changeover switch 19 · · Buffer circuit 20 · · Magnetic sensor device ( Magnetic sensor) 21..Roller 22..Paper feed cassette 23..Discharge cassette 24..CIS (CONTACT / IMAGE / SENSOR)
24a ... Reflective light source 24b ... Rod lens array 24c ... Sensor IC
24d ・ ・ ASIC (Application Specific Integrated Circuit)
24e ·· Transparent 24f ·· Irradiation part (reading position)
25..Transmission type light source 25a..Connector 26..Fixing part 27..Fixing part 30..Photoelectric conversion element (light receiving part)
31 .. Shift register (first shift register circuit)
32. ・ Analog switch (first analog switch circuit)
33 ·· Common line 34 · · Analog switch 35 · · Amplifier (analog amplifier)
36 .. Permanent magnet 37. Yoke plate 40. Magnetic sensing element 40a. One element magnetic sensing element (MRMn)
40b .. The other element magnetic sensing element (MRn)
41..Shift register (second shift register circuit)
42 .. Analog switch (second analog switch circuit)
··· Common line 43a · · One common line 43b · · Other common line 44 · · Analog switch 45 · · Differential amplifier 60 · · Semiconductor chip 70 · · Flexible substrate 70 (a) · · Fine line pattern 70 ( b) .. Electrode pattern

Claims (12)

A housing formed of a flat magnetic body having a slit portion over the reading width on a side wall on the insertion side or a flat plate wall orthogonal to the side wall, with an opposing discharge side as an open end, and a hollow portion inside; A reading medium that has a magnetic region, is inserted from the slit portion, and is discharged from the opening end portion; and the opening end of one flat plate wall that forms a hollow portion of the casing to which the reading medium is conveyed A plurality of magnetic sensing elements placed on the inner side and having a resistance value changed by a magnetic field parallel to the slit portion and their output terminals, and the other forming the hollow portion of the housing A conductor having an insulating surface along the slit portion is wound around a part of the flat plate wall except the opening end, and a DC voltage is applied to the conductor, and the one flat wall and the other flat wall are Magnetic field is generated between the open ends of And a semiconductor chip composed of an analog switch circuit and a shift register circuit that is electrically connected to the output terminal of the substrate and sequentially detects each resistance value change of the magnetic sensing element via a common line. Magnetic sensor device provided. The magnetic sensor device according to claim 1, wherein the conductor having an insulating surface is a flexible substrate in which conductor patterns arranged in parallel with each other are covered with polyimide or a solder resist material. 3. The magnetic sensor device according to claim 1, wherein the one flat plate wall and the other flat plate wall are joined by a side wall on the insertion side. The magnetic sensor device according to claim 1, wherein the substrate is a ferromagnetic metal substrate having a patterned surface subjected to insulation treatment. 5. The magnetic sensor device according to claim 1, wherein each of the magnetic sensing elements includes a pair of a vertically long meander shape pattern and a horizontally long meander shape pattern, each having the output terminal. A housing formed of a flat magnetic body having a slit portion over the reading width on a side wall on the insertion side or a flat plate wall orthogonal to the side wall, with an opposing discharge side as an open end, and a hollow portion inside; A reading medium that has a magnetic region, is inserted from the slit portion, and is discharged from the opening end portion; and the opening end of one flat plate wall that forms a hollow portion of the casing to which the reading medium is conveyed A plurality of magnetic sensing elements placed on the inner side and having a resistance value changed by a magnetic field in parallel with the slit portion and their output terminals, and one of them forming a hollow portion of the casing or A magnet mounted on the outside of the other flat plate wall along the slit, and generating a magnetic field between open ends of the one flat plate wall and the other flat plate wall; and the output terminal of the substrate and the electric Connected, via common line The magnetic sensor device and a semiconductor chip comprising a shift register circuit and the analog switch circuit for continuously detecting the respective resistance change of the magnetic sensing element Te. The magnetic sensor device according to claim 6, wherein the magnet extends to an opening end of the other flat plate wall. The magnetic sensor device according to claim 6 or 7, wherein the one flat plate wall and the other flat plate wall are joined by a side wall on the insertion side. 9. The magnetic sensor device according to claim 6, wherein the substrate is a ferromagnetic metal substrate whose surface to be patterned is insulated. 10. 10. The magnetic sensor device according to claim 6, wherein each of the magnetic sensing elements has a pair of a vertically long meander shape pattern and a horizontally long meander shape pattern, each having the output terminal. 11. Conveying means for conveying a reading medium having a magnetic region in the conveying direction, a light source for irradiating light to a reading position of the conveyed reading medium, a lens array for converging reflected light or transmitted light from the reading position, and A sensor IC having a first shift register circuit and a first analog switch circuit that receives light converged by the lens array and continuously detects each photoelectrically converted voltage with a shift pulse via the first common line. And a predetermined distance in the transport direction from the reading position, and each resistance value change of the magnetic sensing element by a magnetic field is continuously shifted by a shift pulse synchronized with the shift pulse of the sensor IC via a second common line. Reading comprising a magnetic sensor device having a semiconductor chip having a second shift register circuit to detect and a second analog switch circuit Ri discrimination device. The reading discrimination device according to claim 11, wherein the shift pulse of the sensor IC and the shift pulse of the semiconductor chip are shifted in synchronization with the same clock signal.

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