JP2008257395A - Paper leaf processing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable highly accurate detection of tapes pasted on paper leaves with a simple configuration. <P>SOLUTION: A paper leaf processing unit includes: a reflective image detection section 12 for detecting reflected image information by receiving light, being radiated from light sources 41, 42 and reflected on the paper leaf P being carried, via an optical lens 44 by means of a photoelectric sensor 45; and a tape detection means for detecting a tape pasted on the paper leaf P by receiving light, being radiated from light sources 51, 52 and reflected on the paper leaf P being carried, via the optical lens 44 by means of the photoelectric sensor 45. The reflective image detection section 12 and the tape detection section are housed in an identical unit 12a. Signal processing is performed by sharing the optical lens 44 and the photoelectric sensor 45. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a paper sheet processing apparatus that is applied as, for example, a paper sheet discriminating apparatus that discriminates the type, authenticity, and fouling degree of paper sheets such as banknotes.

  This type of paper sheet discriminating apparatus includes a plurality of detection means for detecting the type, authenticity, and degree of contamination of paper sheets. Usually, the type of paper sheet and the degree of fouling are determined by recognizing the most characteristic visible image. This is because paper designs, colors, letters, numbers, etc. are drawn on the assumption that humans can easily distinguish them. Specifically, image sensors, color discrimination sensors, and the like are used.

  The surface of the paper sheet is affixed with aluminum-like glossy material (aluminum foil, hologram, etc.) to prove that the paper sheet is genuine, and tape for repairing the damage of the paper sheet. There is a case.

  Since aluminum-like glossy objects have different wavelengths and intensities of reflected light depending on the angle of illumination, they often do not actively contribute to the determination of paper sheets.

  Further, in the case of a glossy object such as a tape, it is necessary to suppress the regular reflection component from the glossy object in order to read an image or dirt drawn under the tape.

  For the above reasons, in the conventional paper sheet discriminating apparatus, the positional relationship among the light source, the paper sheet, and the light receiving element is devised to reduce the influence of regular reflection from the paper sheet as much as possible.

  On the other hand, in the paper sheet discriminating apparatus, in addition to the above visible image reading, in order to determine the authenticity of the paper sheet, infrared, ultraviolet component analyzing means, magnetic component analyzing means, aluminum foil, metal for detecting holograms A transmission optical system for detecting and detecting a watermark is mounted.

In addition, transmission image detection for detecting the degree of breakage of paper sheets, thickness detection for detecting foreign matters such as tapes affixed to paper sheets, etc. are installed, and each detection result is comprehensively installed. Judgment is made to determine the type, authenticity, and degree of fouling of paper sheets (see, for example, Patent Document 1).
JP 2006-350818 A

  However, conventionally, since a variety of sensors and detections are required as described above, there are disadvantages that the cost ratio required for the entire apparatus is high and the space occupation ratio is also high.

  In particular, in a device that transports paper sheets in the short direction, i.e., a device that transports paper sheets in a direction perpendicular to the longitudinal direction of the paper sheets, since the detection area of the paper sheets is long, the entire surface can be detected. If necessary, it is necessary to lengthen the sensors and detection elements or increase the quantity, which increases the cost.

  In order to reduce costs, there may be a method of placing sensors and light sources specifically for the part with the characteristics of paper sheets. In this case, however, the type of paper sheet, the direction of transport of the paper sheet (front and back, top and bottom) ) Is limited, it is necessary to change the layout of the light source and sensor every time the specifications of the paper sheet change, and there is a disadvantage that the development efficiency is remarkably lowered.

  Also, some tapes affixed on paper sheets have a thickness of 30 μm or less, and there are cases where they cannot be detected by a conventional method of physically measuring the thickness of paper sheets.

  Although there is an example that commercializes thickness detection using a laser displacement meter, it is an inexpensive paper sheet discriminating device because the range that can be determined is limited to pinpoint, and it is more expensive in terms of cost etc. Mounting on was difficult.

  Therefore, it is possible to install a gloss detection optical system that positively detects regular reflection from the tape by using the gloss of the tape, but there is a disadvantage that the cost increases and the occupied space also increases. .

  In addition, since there is no effect at all on a non-glossy mending tape, there is a problem that even if gloss detection is installed, it does not reach the conventional thickness detection.

  The present invention has been made paying attention to the above circumstances, and its object is to add a means for detecting a tape to an optical system for image detection, thereby reducing the cost and accuracy of a paper sheet processing apparatus. Is to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the paper sheet is transported, and the paper sheet transported by the transport means is irradiated with light from a first light source, and the paper sheet The light transmitted through the image is received by the photoelectric sensor via the optical lens and the transmitted image detecting means for detecting the transmitted image information, and the paper sheet conveyed by the conveying means is irradiated with light from the second light source. A reflected image detecting means for detecting reflected image information by receiving light reflected from the paper sheet through an optical lens with a photoelectric sensor; and a third light source for the paper sheet conveyed by the conveying means. A reflected light detection device comprising: a tape detection unit configured to detect a tape affixed to the paper sheet by receiving light reflected from the paper sheet through an optical lens and detecting a tape affixed to the paper sheet; Means and the tape detecting means are the same. Stored in the unit, characterized in that the signal processing also serves the optical lens and a photoelectric sensor.

  According to a twenty-ninth aspect of the present invention, there is provided a conveying unit that conveys a paper sheet, and irradiates light from the first light source to the paper sheet conveyed by the conveying unit, and optically transmits the light transmitted through the paper sheet. A transmission image detection means for detecting transmission image information received by a photoelectric sensor through a lens, and irradiating light from a second light source to the paper sheet conveyed by the conveyance means and reflecting from the paper sheet Reflected light detecting means for detecting reflected image information by receiving a light to be reflected by a photoelectric sensor through an optical lens, and irradiating light from a third light source to the paper sheets conveyed by the conveying means, Tape detection means for detecting light reflected from a paper sheet by a photoelectric sensor via an optical lens and detecting a tape affixed to the paper sheet, the transmitted image detection means, and the tape detection means Is stored in the same unit , Characterized in that it also serves to signal processing the optical lens and a photoelectric sensor.

  According to a forty-eighth aspect of the present invention, there is provided a conveying unit that conveys the paper sheet, and irradiates light from the first light source to the paper sheet conveyed by the conveying unit, and optically transmits the light transmitted through the paper sheet A transmission image detection means for detecting transmission image information received by a photoelectric sensor through a lens, and irradiating light from a second light source to the paper sheet conveyed by the conveyance means and reflecting from the paper sheet Reflected light detecting means for detecting reflected image information by receiving a light to be reflected by a photoelectric sensor through an optical lens, and irradiating light from a third light source to the paper sheets conveyed by the conveying means, Tape detection means for detecting light reflected from the paper sheet by a photoelectric sensor via an optical lens and detecting the tape affixed to the paper sheet, and the third light source of the tape detection means comprises: , Visible light source and ultraviolet light source Then, reflected light and excitation light irradiated from the visible light source unit and the ultraviolet light source unit to the paper sheet and reflected from the paper sheet are received by the photoelectric sensor through the optical lens, and signal processing is performed. It is characterized by doing.

  ADVANTAGE OF THE INVENTION According to this invention, the tape affixed on paper sheets can be detected with a simple structure with high precision, and it becomes possible to reduce cost.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a discrimination unit 1 of a paper sheet discrimination apparatus according to an embodiment of the present invention.

  A conveying path 2 is provided inside the determination unit 1, and first to third conveying roller pairs 3 to 5 and lower conveying rollers 6 and 7 are disposed along the conveying path 2 at a predetermined interval. ing. The first to third conveyance roller pairs 3 to 5 are configured by upper rollers 3 a to 5 a and lower rollers 3 b to 5 b that are arranged to face each other via the conveyance path 2. The paper sheet P is conveyed along the conveyance path 2 from the right to the left in the drawing.

  Between the first conveyance roller pair 3 and the second conveyance roller pair 4, a partial transmission image detection unit 11 as a transmission image detection unit that detects transmission image information of the paper sheet P is provided. Between the transport roller pair 4 and the third transport roller pair 5, there is provided an upper surface reflection image detection unit 12 as a reflection image detection means for detecting the reflection image information on the upper surface of the paper sheet P. Between the conveying roller pair 5 and the lower conveying roller 6, a lower surface reflection image detection unit 13 that detects reflected image information on the lower surface of the paper sheet P is provided.

  On the upper side of the lower transport roller 6, a magnetic detection unit 14 that detects the magnetic printing characteristics of the paper sheet P via the transport path 2 is provided, and between the lower transport rollers 6 and 7, the paper sheet A fluorescence emission detection unit 15 for detecting the bleaching emission characteristic and the fluorescence emission characteristic from P is provided, and the thickness of the paper sheet P is detected on the upper side of the lower conveyance roller 6 to detect tape or a plurality of sheets. A thickness detector 16 is provided.

  In addition, a detection information processing unit 17 that is connected to each of the detection units 11 to 16 through a communication circuit and processes detection information from the detection units 11 to 16 is installed in the upper part of the determination unit 1. Yes.

  FIG. 2 is a functional block diagram of the detection information processing unit 17.

  The transmission image detection unit 11, the upper surface reflection image detection unit 12, and the lower surface reflection image detection unit 13 described above are, for example, a one-dimensional image reading sensor using an LED array as a light emitting unit and a photodiode array or a CCD (Charge Coupled Device) as a light receiving unit. In the LED, visible light or near infrared light is used depending on the application.

  The magnetic detection unit 14 is a sensor such as a magnetic head, for example. A DC bias current is applied to the primary side of the core material, and a change in flux when the magnetic material passes through the head unit is detected by the secondary side coil. It is a sensor.

  The fluorescence emission detection unit 15 is a sensor that detects an excitation light emitted from a paper sheet in a spot visual field having a photodiode as a light receiving unit, with the light emitting unit being an ultraviolet light emitting lamp.

  The thickness detector 16 sandwiches a paper sheet between two rollers, and converts a fluctuation amount of a roller on one side or a shaft supporting the roller into an electric signal by a displacement sensor or the like.

  The detection data from each of the detection units 11 to 16 is amplified / processed through the analog processing circuits 21 to 26 such as operational amplifiers, and six analog signals are converted into one system by the analog multiplexer 27. After being time-divided into analog signals, the analog / digital conversion circuit 31 converts the signals into, for example, 8-bit digital data.

  In this embodiment, the analog multiplexer 27 time-divides the analog signal into one system in order to make the analog / digital conversion circuit 31 one circuit. However, depending on the system assembly and hardware conditions, all detection signals Even if the analog / digital conversion is independently performed, the effects of the present invention are not affected at all.

  The detection data converted into the digital signal by the analog / digital conversion circuit 31 is subjected to preprocessing (for example, spatial differentiation, averaging, etc.) according to each detection content by the subsequent preprocessing circuit 32, and the data storage unit 33. Is remembered. The detection CPU 34 is a processing operation unit represented by a microcomputer, and sequentially reads the detection data from the data storage unit 33 to determine the type, direction, authenticity, degree of contamination, etc. of the paper sheet P that is the discriminating paper sheet. I do.

  Similarly, the control CPU 35 is a processing calculation unit represented by a microcomputer, and notifies the calculation result of the detection CPU 34 to a higher-level device, for example, a mechanism control unit (not shown) of the paper sheet discrimination device. The mechanism control unit switches the conveyance path switching unit (not shown) based on the type, direction, authenticity, and contamination degree information from the discrimination unit 1 so that the paper sheets 101 are conveyed to the stacker to be stored. Control.

  FIG. 3 shows the above-described top-surface reflection image detection unit 12.

  The upper surface reflection image detection unit 12 includes a pair of diffuse reflection light sources (second light sources) 41 and 42 in the unit 12a, and an optical lens 44 between the pair of diffuse reflection light sources 41 and 42. Is provided. The optical lens 44 is, for example, a rod lens array that forms an image at a magnification of 1: 1, or a spherical lens that reduces an image to form an image.

  Right and left of the optical lens 44 are provided with regular reflection light sources (third light sources) 51 and 52 constituting a tape detection means, and below the regular reflection light sources 51 and 52 are diffusion plates 54, 55 is disposed. For example, when the light source has a discrete arrangement such as an LED array, the diffusion plates 54 and 55 are for preventing the light distribution from being rippled, and may be inserted as necessary. An antireflection film 48 and an optical glass 43 are disposed below the optical lens 44 and the diffusion plates 54 and 55. The antireflection film 48 is for preventing light from the light sources 41, 42, 51, 52 from being reflected in the upper reflective optical system 12 and causing unnecessary optical information to reach the photoelectric sensor 45 described later. A photoelectric sensor 45 and a sensor signal processing substrate 46 are disposed above the optical lens 44.

  The upper surface reflection image detection unit 12 and the tape detection unit described above are disposed in the same unit 12a and share the optical lens 44, the photoelectric sensor 45, the optical glass 43, and the antireflection film 48.

  The light emitted from the diffuse reflection light sources 41 and 42 passes through the antireflection film 48 and the optical glass 43 and irradiates the surface of the paper sheet P, and the reflected light passes through the optical glass 43 again. To the optical lens 44. The reflected light that passes through the optical lens 44 is received by the photoelectric sensor 45, and the optical signal is converted into an electrical signal in the sensor. When the photoelectric sensor 45 is a one-dimensional sensor such as a CCD or a photodiode, the image data of the paper sheet is collected and accumulated for each line, and the next one line data is collected and stored in the same manner as the paper sheet is conveyed. As a result, a two-dimensional image is formed.

  On the other hand, the light emitted from the light sources 51 and 52 for specular reflection passes through the antireflection film 48 and the optical glass 43 through the diffusion plates 54 and 55, respectively, and irradiates the surface of the paper sheet P. The reflected light reaches the optical lens 44 through the optical glass 43 again. The reflected light that has passed through the optical lens 44 is received by the photoelectric sensor 45. Both diffuse reflection light and regular reflection light are amplified and A / D converted by the sensor signal processing board 46.

  FIG. 4 shows an example of the lighting timing of the light sources 41, 42, 51 and 52 described above.

  The diffuse reflection light sources 41 and 42 and the regular reflection light sources 51 and 52 are turned on simultaneously, and each is turned on in a time-sharing manner. This is a control method for avoiding confusion between diffuse reflection light and regular reflection light, and is one of the features of the present invention.

  By illuminating both in a time-sharing manner, image data that is not affected by the tape type, which is used for paper ticket type and image recognition, and image data that shows tape gloss or tape characteristics are accurately separated. Can be detected.

  In addition, in order to increase the processing efficiency of the paper sheet determination apparatus, as shown in FIG. 5, the diffuse reflection image and the regular reflection image are simultaneously turned on to extract an image in which the diffuse reflection image and the regular reflection image are mixed. It is also possible to execute ticket type / image recognition and tape detection simultaneously by processing.

  For example, it is possible to avoid the influence of regular reflection by excluding the area determined to be the tape application part from the object of ticket type detection or image recognition.

  Next, the arrangement configuration of the above-described regular reflection light sources 51 and 52 will be described.

  The light sources 51 and 52 for specular reflection ideally can obtain the maximum specular reflection light when the paper is irradiated perpendicularly, but the lens 44 is disposed at the optical center in the configuration of FIG. Therefore, vertical illumination is impossible.

  However, the surface of the tape affixed to the paper sheet is not a perfectly flat mirror surface, and there is also flapping when the paper sheet itself is conveyed. be able to.

  As a result of testing with various paper sheets, it has been found that there are many cases where a regular reflection image is obtained by irradiation within ± 20 degrees when the vertical direction with respect to the paper sheets is set to 0 degrees.

  In order to detect diffuse reflection and regular reflection from a paper sheet with high accuracy, it is necessary to suppress the movement of the paper sheet, that is, fluttering of the paper sheet as much as possible. As one of the realization methods, there is a method of conveying paper sheets while being sandwiched between belts or the like.

However, in this case, there is a demerit that the entire surface of the paper sheet cannot be detected because the image of the portion of the belt is not visible. As a method to stably convey while detecting the entire surface of the paper,
a. A method in which a suction device for the paper sheet P is provided on the opposite side to the transport path, and the paper sheet P is sucked and transported to the opposing surface.

  b. A method in which the distance between the optical glass 43 and the paper sheet P and the surface facing the paper sheet P is made as narrow as possible to suppress the range in which the paper sheet P flutters.

  c. A method is conceivable in which a roller is arranged at the center of the optical axis on the opposite surface so that the paper sheet P is conveyed in a narrow area between the optical glass 43 and the roller.

  By the way, there is a non-glossy tape such as a mending tape. About such a tape, the regular reflection light from a tape cannot be obtained even if it irradiates with a regular reflection light source.

  However, it has been experimentally confirmed that a mending tape and some glossy tapes emit so-called fluorescent light that is excited by visible light when irradiated with ultraviolet rays. By using this feature, for example, the light source 42 in FIG. 3 is composed of an ultraviolet light source, for example, an ultraviolet LED having a central wavelength of 365 nm, and a light source lighting method as shown in FIG. Three types of specular reflection images and fluorescence excitation images can be obtained with one optical system.

  Furthermore, the fluorescent image can be used not only for tape detection but also for bleach detection, which is a feature of counterfeit bills, and for detection of fluorescent images embedded in paper sheets. It also contributes to cost reduction.

  In FIG. 3, two light sources 41 and 42 for diffuse reflection are arranged. This is a double-sided illumination for eliminating the influence of shadows caused by folding and wrinkling of paper sheets, and one light source is provided on one side. However, this does not impair the effects of the present invention. Further, even if there are three or more light sources for diffuse reflection, the effect of the present invention is not impaired.

  In addition, two light sources 51 and 52 for regular reflection are arranged. This is a double-sided illumination to eliminate the influence of shadows caused by folding or wrinkling of paper sheets, and even one light source on one side can be used. There is no loss of effectiveness. Further, even if there are three or more light sources for regular reflection, the effect of the present invention is not impaired.

  In this embodiment, the upper optical system has been described. However, the same effect can be obtained with the lower optical system 13 shown in FIG.

  FIG. 7 shows an upper reflective optical system 12A according to the second embodiment of the present invention.

  In the second embodiment and the following embodiments, the same parts as those described in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted. To do.

  In the second embodiment, the regular reflection light sources 61 and 62 are light sources called a light guide tube or a cell guide, and ripples seen in an LED array or the like do not occur even when illuminated from close proximity. This is because the illumination means called a light guide tube or a cell guide is a light source that diffuses a light source such as an LED with an acrylic material or the like and shines a long surface. Normally, it is used as a diffused light source, but it is possible to obtain a stable regular reflection light source by narrowing the optical axis at a position very close to the paper sheet.

  The light emitted from the diffuse reflection light sources 41 and 42 passes through the optical glass 43 and irradiates the surface of the paper sheet P, and the reflected light reaches the optical lens 44 through the optical glass 43 again. The reflected light that passes through the optical lens 44 is received by the photoelectric sensor 45, and the optical signal is converted into an electrical signal in the sensor.

  The light from the light sources 61 and 62 for regular reflection passes through the optical glass 43 and irradiates the surface of the paper sheet P, and the reflected light reaches the optical lens 44 through the optical glass 43 again. The reflected light that has passed through the optical lens 44 is received by the photoelectric sensor 45. Both diffuse reflection light and regular reflection light are amplified and A / D converted by the sensor signal processing substrate 46.

  The lighting timing is the same as in the first embodiment described above. The diffuse reflection light source and the regular reflection light source are turned on in a time-sharing manner, or both the diffuse reflection light and the regular reflection light are turned on simultaneously. Then, an image obtained by mixing the diffuse reflection image and the regular reflection image is extracted, and the bill type / image recognition and the tape detection are simultaneously executed by image processing.

  Further, the light source 42 is composed of an ultraviolet light source, for example, an ultraviolet LED having a central wavelength of 365 nm, and the light source lighting method shown in FIG. 6 is used, so that a diffuse reflection image, a regular reflection image, and an excitation image by fluorescence 3 You may make it obtain a kind with one optical system. According to this, the fluorescent image can be used not only for detecting the mending tape but also for detecting the bleaching that is a feature of the counterfeit note and for detecting the fluorescent image embedded in the paper sheet. This contributes to space saving and cost reduction.

  Further, the number of light sources 41 and 42 for diffuse reflection is not limited to two, and one or three or more light sources may be arranged.

  Although the second embodiment has been described using the upper optical system, the lower optical system 13 shown in FIG. 1 can obtain the same effect with the same configuration.

  FIG. 8 shows an upper reflective optical system 12B according to the third embodiment of the present invention.

  In the third embodiment, an optical lens 65 is provided below the photoelectric sensor 45. The optical lens 65 is, for example, a spherical lens that reduces an image to form an image. A beam splitter 64 is provided below the optical lens 65. A light source 66 for regular reflection is provided on the side of the beam splitter 64. For example, a beam splitter 64 that transmits 50% of incident light and reflects 50% thereof is used.

  The light emitted from the diffuse reflection light sources 41 and 42 passes through the optical glass 43 and irradiates the surface of the paper sheet P. The reflected light reflected from the paper sheet P reaches the beam splitter 64 through the optical glass 43 again. The reflected light component transmitted through the beam splitter 64 is received by the photoelectric sensor 45 via the optical lens 65, and the optical signal is converted into an electrical signal in the sensor.

  On the other hand, the light emitted from the regular reflection light source 66 enters the beam splitter 64, and the component reflected from the beam splitter 64 passes through the optical glass 43 and irradiates the surface of the paper sheet P vertically. The reflected light reflected from the paper sheet P travels again to the beam splitter 64 through the optical glass 43. The component of the reflected light that has passed through the beam splitter 64 is received by the photoelectric sensor 45 via the optical lens 65 and converted into an electrical signal.

  Both the diffuse reflection light and the regular reflection light described above are amplified and A / D converted by the sensor signal processing board 46.

  Here, since the beam splitter 64 transmits 50% of the incident light and reflects 50%, 50% of the light from the light source 66 is irradiated onto the paper sheet P, and 50% of the reflected light from the paper sheet P is irradiated. % Is received by the photoelectric sensor 45 through the optical lens 65. That is, only reflected light of about 25% with respect to the intensity of the light source 66 can be obtained. However, since the irradiated light is irradiated completely perpendicular to the paper sheet P, a complete regular reflection signal is obtained.

  In addition, for example, a light source that illuminates the optical axis from right to left facing the light source 66 is disposed, and a beam splitter obtained by rotating the beam splitter 64 by 90 degrees is disposed on the optical axis, so that twice the amount of light is obtained. It can also be obtained.

  Note that the lighting timing is the same as in the first embodiment described above, in which the diffuse reflection light sources 41 and 42 and the regular reflection light source 66 are turned on in a time-sharing manner, or are turned on simultaneously and diffused reflection images. Alternatively, an image obtained by mixing the regular reflection images may be extracted, and the bill type / image recognition and the tape detection may be simultaneously performed by image processing.

  Further, in FIG. 8, the light source 42 is composed of an ultraviolet light source, for example, an ultraviolet LED having a central wavelength of 365 nm, and a lighting method of the light source as shown in FIG. By obtaining three types of excitation images with a single optical system, detection of matte tape such as mending tape, detection of bleaching, which is a feature of counterfeit, and detection of fluorescent images embedded in paper sheets Is possible.

  In FIG. 8, the number of light sources 41 and 42 for diffuse reflection is not limited to two, but may be one or three or more, and the number of light sources 66 for regular reflection is also limited to one. Without limitation, two or more may be provided.

  Although the third embodiment has been described using the upper optical system, the same effect can be obtained with the same configuration in the lower optical system 13 shown in FIG.

  FIG. 9 shows a transmission optical system 11 according to the fourth embodiment of the present invention.

  In the fourth embodiment, a light source 71 for transmission is provided on the lower side of the paper sheet transport path, and a regular reflection optical system is disposed on the light receiving side on the upper side of the transport path.

  The light emitted from the light source 71 passes through the paper sheet P, passes through the optical glass 43, the antireflection film 48, and the optical lens 44, and is received by the photoelectric sensor 45. The optical signal is converted into an electrical signal in the sensor. Converted.

  The light emitted from the regular reflection light sources 51 and 52 is transmitted through the antireflection film 48 and the optical glass 43 to irradiate the surface of the paper sheet P, and the reflected light is optically transmitted through the optical glass 43 again. The lens 44 is reached. The reflected light passing through the optical lens 44 is received by the photoelectric sensor 45, and the optical signal is converted into an electrical signal in the sensor. The specularly reflected light is amplified and A / D converted by the sensor signal processing substrate 710.

  The illumination lighting timing is the same time-sharing method as in FIG. 4, the transmissive light source 71 is lit at the diffuse reflection timing, and the regular reflection light source is lit at the same timing as in the first embodiment. The

  Further, the light source 52 of FIG. 9 is composed of an ultraviolet light source, for example, an ultraviolet LED having a central wavelength of 365 nm, and a light source lighting method as shown in FIG. Three types of images can be obtained with one optical system. This makes it possible not only to detect a dull tape (fluorescent image) such as a mending tape, but also to detect bleaching, which is a feature of counterfeit bills, and to detect fluorescent images embedded in paper sheets. .

  Further, the number of light sources 51 and 52 for regular reflection is not limited to two, and may be one or three or more.

  FIG. 10 shows a transmission optical system 11A according to the fifth embodiment of the present invention.

  In this embodiment, the transmission light source 72, the optical lens 44, the photoelectric sensor 45, and the sensor signal processing board 46 are arranged so as to be positioned on the first optical axis inclined at a predetermined angle with respect to the perpendicular. The light source 73 for specular reflection is also provided so as to be positioned on the second optical axis inclined at a predetermined angle in the opposite direction with respect to the perpendicular.

  The light emitted from the transmissive light source 72 passes through the paper sheet P, passes through the optical glass 43, the antireflection film 48, and the optical lens 44, and is received by the photoelectric sensor 45. The optical signal is converted into an electrical signal in the sensor. Is converted to

  The light emitted from the regular reflection light source 73 is transmitted through the diffusion plate 74 and the optical glass 43 to irradiate the surface of the paper sheet P, and the reflected light again passes through the optical glass 43 to the optical lens 44. It reaches. The reflected light passing through the optical lens 44 is received by the photoelectric sensor 45, and the optical signal is converted into an electrical signal in the sensor. The specularly reflected light is amplified and A / D converted by the sensor signal processing substrate 710.

  According to this embodiment, since the first optical axis and the second optical axis are equiangular with respect to the perpendicular, sufficient reflected light corresponding to the intensity of the light source 73 can be obtained, and the regular reflection information Can be definitely obtained.

  FIG. 11 shows a sixth embodiment of the present invention.

  As described in the first embodiment described above, the tape includes not only a glossy tape but also a non-glossy tape such as a mending tape. Although it is not possible to obtain specularly reflected light from such a tape even when irradiated with a light source for specular reflection, it has been experimentally confirmed that it emits so-called fluorescent light that is excited by visible light when irradiated with ultraviolet light. ing.

  Using this feature, in this embodiment, an optical system only for tape detection is configured.

  The light emitted from the regular reflection light source 51 and the ultraviolet light source 75 passes through the antireflection film 48 and the optical glass 43 through the diffusion plates 54 and 55, respectively, and irradiates the surface of the paper sheet P. The reflected light reaches the optical lens 44 through the optical glass 43 again. The reflected light that has passed through the optical lens 44 is received by the photoelectric sensor 45. Both diffuse reflection light and regular reflection light are amplified and A / D converted by the sensor signal processing substrate 46.

  The regular reflection light source 51 and the ultraviolet light source 75 are lit in a manner as shown in FIG. According to this, two types of specular reflection images and fluorescence excitation images can be obtained with one optical system, and a wide variety of tapes affixed to the paper sheet P can be detected with a simple configuration.

  Furthermore, the fluorescent image can be used not only for tape detection but also for bleach detection, which is a feature of counterfeit bills, and for detection of fluorescent images embedded in paper sheets. It also contributes to cost reduction.

  As described above, according to the present invention, in the paper sheet discriminating apparatus, instead of the foreign object detection by the conventional physical thickness detection sensor, by providing the gloss detection using the image input means, An extremely thin tape or a mending tape that cannot be detected visually can be detected with high accuracy.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

1 is a schematic configuration diagram showing a paper sheet discriminating apparatus according to an embodiment of the present invention. The block diagram which shows the detection information processing part of the paper sheet discrimination | determination apparatus of FIG. The figure which shows the upper side reflection optical system of the paper sheet discrimination | determination apparatus of FIG. The figure which shows the 1st lighting timing of the light source of the upper side reflective optical system of FIG. The figure which shows the 2nd lighting timing of the light source of the upper side reflective optical system of FIG. The figure which shows the 3rd lighting timing of the light source of the upper reflective optical system of FIG. The figure which shows the upper side reflective optical system which is the 2nd Embodiment of this invention. The figure which shows the upper side reflective optical system which is the 3rd Embodiment of this invention. The figure which shows the transmission optical system which is the 4th Embodiment of this invention. The figure which shows the transmission optical system which is the 5th Embodiment of this invention. The figure which shows the tape detection optical system which is the 6th Embodiment of this invention. The figure which shows the lighting timing of the light source of the tape detection optical system of FIG.

Explanation of symbols

  P ... paper sheets, 2 ... conveying path (conveying means), 11 ... transmission image detection unit (transmission image detection means), 12 ... reflection image detection unit (reflection image detection means), 12a ... unit, 41, 42 ... light source (Second light source), 44 ... optical lens, 45 ... photoelectric sensor, 48 ... antireflection film, 51, 52 ... light source (third light source / tape detection means), 54, 55 ... diffusion plate, 71, 72 ... Transmitted light source (first light source).

Claims (57)

Conveying means for conveying paper sheets;
A transmission image for detecting transmission image information by irradiating light from a first light source onto the paper sheet transported by the transport means and receiving light transmitted through the paper sheet with a photoelectric sensor through an optical lens Detection means;
Reflection for detecting reflected image information by irradiating light from a second light source onto the paper sheet transported by the transporting means, and receiving light reflected from the paper sheet with a photoelectric sensor via an optical lens Image detection means;
The paper sheet transported by the transport means is irradiated with light from a third light source, and the light reflected from the paper sheet is received by a photoelectric sensor through an optical lens, and is affixed to the paper sheet. Tape detecting means for detecting the tape,
The paper sheet processing apparatus, wherein the reflected image detection means and the tape detection means are stored in the same unit and perform signal processing using both the optical lens and the photoelectric sensor.   2. The paper sheet processing apparatus according to claim 1, wherein the second light source of the reflected image detection unit and the third light source of the tape detection unit are turned on in a time-sharing manner.   2. The paper sheet according to claim 1, wherein the third light source of the tape detection unit has a light irradiation angle closer to the vertical than the second light source of the reflection image detection unit. Processing equipment.   The light emitted from the third light source of the tape detection unit is irradiated to the paper sheet through a diffusion plate for flattening ripples of elements of the third light source. Item 1. A paper sheet processing apparatus according to item 1.   The unit is provided with an optical glass for preventing the entry of paper sheets and dust into the unit, and the light emitted from the third light source of the tape detecting means passes through the optical glass. 2. The paper sheet processing apparatus according to claim 1, wherein the paper sheet is irradiated.   Antireflection for preventing the light emitted from the third light source of the tape detecting means from being reflected on the surface of the optical glass and causing unnecessary optical information in the unit. 6. The paper sheet processing apparatus according to claim 5, wherein a film is provided.   2. The paper sheet processing apparatus according to claim 1, wherein the second light source of the reflected image detection unit and the third light source of the tape detection unit are turned on simultaneously.   The second light source of the reflected image detection means and the third light source of the tape detection means are LEDs, fluorescent tubes, cold cathode tubes, EL (electro-luminescence) elements, hot cathode tubes, incandescent bulbs, halogen light sources. The paper sheet processing apparatus according to claim 1, wherein any one of a light source and a xenon light source is used.   2. The apparatus according to claim 1, further comprising: a regulating unit that regulates flapping of the paper sheets irradiated with light from the second light source of the reflected image detecting unit and the third light source of the tape detecting unit. Paper sheet processing equipment.   2. The paper sheet processing apparatus according to claim 1, wherein the third light source of the tape detection means is a light guide tube or a cell guide that uses an LED as a light source and diffuses and emits light with a resin such as acrylic.   The light emitted from the third light source of the tape detection means is reflected to the paper sheet side by a beam splitter, and the reflected light reflected from the paper sheet is incident on the beam splitter again, 2. The paper sheet processing apparatus according to claim 1, wherein the transmitted light is received by the photoelectric sensor through the optical lens.   12. The paper sheet processing apparatus according to claim 11, wherein the second light source of the reflected image detection unit and the third light source of the tape detection unit are turned on in a time-sharing manner.   The light emitted from the third light source of the tape detection unit is irradiated to the paper sheet through a diffusion plate for flattening ripples of elements of the third light source. Item 12. A paper sheet processing apparatus according to Item 11.   The unit is provided with an optical glass for preventing the entry of paper sheets and dust into the unit, and the light emitted from the third light source of the tape detecting means passes through the optical glass. The paper sheet processing apparatus according to claim 11, wherein the paper sheet is irradiated.   Anti-reflection for preventing the light emitted from the third light source of the tape detecting means from being reflected on the surface of the optical glass and causing unnecessary optical information in the unit. 15. The paper sheet processing apparatus according to claim 14, further comprising a film.   12. The paper sheet processing apparatus according to claim 11, wherein the second light source of the reflected image detection unit and the third light source of the tape detection unit are turned on simultaneously.   The second light source of the reflected image detecting means and the third light source of the tape detecting means are LED, fluorescent tube, cold cathode tube, EL (electro-luminescence) element, hot cathode tube, incandescent bulb, halogen light source. 12. The paper sheet processing apparatus according to claim 11, wherein any one of a light source and a xenon light source is used.   12. The apparatus according to claim 11, further comprising a regulating unit that regulates flapping of the paper sheets irradiated with light from the second light source of the reflected image detecting unit and the third light source of the tape detecting unit. Paper sheet processing equipment.   The third light source of the tape detection means includes a visible light source and an ultraviolet light source, and the paper is irradiated from the visible light source and the ultraviolet light source from the paper. 2. The paper sheet processing apparatus according to claim 1, wherein reflected light and excitation light reflected by the light are received by a photoelectric sensor via the optical lens and processed.   20. The sheet processing apparatus according to claim 19, wherein the second light source of the reflected image detection unit and the third light source of the tape detection unit are turned on in a time-sharing manner.   The paper sheet according to claim 19, wherein the third light source of the tape detection unit has a light irradiation angle closer to the vertical than the second light source of the reflection image detection unit. Processing equipment.   The light emitted from the third light source of the tape detection unit is irradiated to the paper sheet through a diffusion plate for flattening ripples of elements of the third light source. Item 20. A paper sheet processing apparatus according to Item 19.   The unit is provided with an optical glass for preventing the entry of paper sheets and dust into the unit, and the light emitted from the third light source of the tape detecting means passes through the optical glass. The paper sheet processing apparatus according to claim 19, wherein the paper sheet is irradiated.   Antireflection for preventing the light emitted from the third light source of the tape detecting means from being reflected on the surface of the optical glass and causing unnecessary optical information in the unit. 24. The paper sheet processing apparatus according to claim 23, wherein a film is provided.   20. The sheet processing apparatus according to claim 19, wherein the second light source of the reflected image detection unit and the third light source of the tape detection unit are turned on simultaneously.   The second light source of the reflected image detecting means and the third light source of the tape detecting means are LED, fluorescent tube, cold cathode tube, EL (electro-luminescence) element, hot cathode tube, incandescent bulb, halogen light source. 20. The paper sheet processing apparatus according to claim 19, wherein any one of xenon light source and xenon light source is used.   20. The apparatus according to claim 19, further comprising a regulating unit that regulates flapping of the paper sheets irradiated with light from the second light source of the reflected image detecting unit and the third light source of the tape detecting unit. Paper sheet processing equipment.   20. The sheet processing apparatus according to claim 19, wherein the third light source of the tape detecting means is a light guide tube or a cell guide that uses an LED as a light source and diffuses and emits light with a resin such as acrylic. Conveying means for conveying paper sheets;
A transmission image for detecting transmission image information by irradiating light from a first light source onto the paper sheet transported by the transport means and receiving light transmitted through the paper sheet with a photoelectric sensor through an optical lens Detection means;
Reflection for detecting reflected image information by irradiating light from a second light source onto the paper sheet transported by the transporting means, and receiving light reflected from the paper sheet with a photoelectric sensor via an optical lens Image detection means;
The paper sheet transported by the transport means is irradiated with light from a third light source, and the light reflected from the paper sheet is received by a photoelectric sensor through an optical lens, and is affixed to the paper sheet. Tape detecting means for detecting the tape,
The paper sheet processing apparatus, wherein the transmission image detection unit and the tape detection unit are stored in the same unit and perform signal processing using both the optical lens and the photoelectric sensor.   30. The paper sheet processing apparatus according to claim 29, wherein the first light source of the transmission image detection unit and the third light source of the tape detection unit are turned on in a time-sharing manner.   The light emitted from the third light source of the tape detection unit is irradiated to the paper sheet through a diffusion plate for flattening ripples of elements of the third light source. Item 29. The paper sheet processing apparatus according to Item 29.   The unit is provided with an optical glass for preventing the entry of paper sheets and dust into the unit, and the light emitted from the third light source of the tape detecting means passes through the optical glass. 30. The paper sheet processing apparatus according to claim 29, wherein the paper sheet is irradiated.   Antireflection for preventing the light emitted from the third light source of the tape detecting means from being reflected on the surface of the optical glass and causing unnecessary optical information in the unit. 33. The paper sheet processing apparatus according to claim 32, wherein a film is provided.   30. The paper sheet processing apparatus according to claim 29, wherein the first light source of the transmission image detecting means and the third light source of the tape detecting means are turned on simultaneously.   The first light source of the transmission image detecting means and the third light source of the tape detecting means are LED, fluorescent tube, cold cathode tube, EL (electro-luminescence) element, hot cathode tube, incandescent bulb, halogen light source. 30. The paper sheet processing apparatus according to claim 29, wherein any one of a light source and a xenon light source is used.   30. A regulation unit that regulates flapping of the paper sheets irradiated with light from the first light source of the transmission image detection unit and the third light source of the tape detection unit. Paper sheet processing equipment.   30. The paper sheet processing apparatus according to claim 29, wherein the third light source of the tape detection means is a light guide tube or a cell guide that uses an LED as a light source and diffuses and emits light with a resin such as acrylic.   The third light source of the tape detection means includes a visible light source and an ultraviolet light source, and the paper is irradiated from the visible light source and the ultraviolet light source from the paper. 30. The paper sheet processing apparatus according to claim 29, wherein the reflected light and excitation light reflected by the light are received by a photoelectric sensor through the optical lens and processed.   39. The paper sheet processing apparatus according to claim 38, wherein the second light source of the transmitted image detecting means and the third light source of the tape detecting means are turned on in a time-sharing manner.   39. The paper sheet according to claim 38, wherein the third light source of the tape detecting means has a light irradiation angle closer to the paper sheet than the second light source of the reflected image detecting means. Processing equipment.   The light emitted from the third light source of the tape detection unit is irradiated to the paper sheet through a diffusion plate for flattening ripples of elements of the third light source. Item 39. The paper sheet processing apparatus according to Item 38.   The unit is provided with an optical glass for preventing the entry of paper sheets and dust into the unit, and the light emitted from the third light source of the tape detecting means passes through the optical glass. 40. The paper sheet processing apparatus according to claim 38, wherein the paper sheet is irradiated.   Antireflection for preventing the light emitted from the third light source of the tape detecting means from being reflected on the surface of the optical glass and causing unnecessary optical information in the unit. 43. The paper sheet processing apparatus according to claim 42, wherein a film is provided.   39. The paper sheet processing apparatus according to claim 38, wherein the second light source of the reflected image detecting means and the third light source of the tape detecting means are turned on simultaneously.   The second light source of the transmission image detecting means and the third light source of the tape detecting means are LEDs, fluorescent tubes, cold cathode tubes, EL (electro-luminescence) elements, hot cathode tubes, incandescent bulbs, halogen light sources. 40. The paper sheet processing apparatus according to claim 38, wherein any one of a light source and a xenon light source is used.   39. The apparatus according to claim 38, further comprising a regulating unit that regulates flapping of the paper sheets irradiated with light from the second light source of the transmission image detecting unit and the third light source of the tape detecting unit. Paper sheet processing equipment.   39. The paper sheet processing apparatus according to claim 38, wherein the third light source of the tape detecting means is a light guide tube or a cell guide that uses an LED as a light source and diffuses and emits light with a resin such as acrylic. Conveying means for conveying paper sheets;
A transmission image for detecting transmission image information by irradiating light from a first light source onto the paper sheet transported by the transport means and receiving light transmitted through the paper sheet with a photoelectric sensor through an optical lens Detection means;
Reflection for detecting reflected image information by irradiating light from a second light source onto the paper sheet transported by the transporting means, and receiving light reflected from the paper sheet with a photoelectric sensor via an optical lens Image detection means;
The paper sheet transported by the transport means is irradiated with light from a third light source, and the light reflected from the paper sheet is received by a photoelectric sensor through an optical lens, and is affixed to the paper sheet. Tape detecting means for detecting the tape,
The third light source of the tape detection means includes a visible light source and an ultraviolet light source, and the paper is irradiated from the visible light source and the ultraviolet light source from the paper. The sheet processing apparatus is characterized in that reflected light and excitation light reflected by the light are received by a photoelectric sensor through the optical lens and processed.   49. The paper sheet processing apparatus according to claim 48, wherein the visible light emission light source unit and the ultraviolet light emission light source unit of the tape detection unit are turned on in a time-sharing manner.   49. The paper sheet processing apparatus according to claim 48, wherein the third light source of the tape detection means is installed at an irradiation angle within ± 20 degrees with respect to the paper sheet.   The light emitted from the third light source of the tape detection unit is irradiated to the paper sheet through a diffusion plate for flattening ripples of elements of the third light source. Item 48. The paper sheet processing apparatus according to Item 48.   The unit is provided with an optical glass for preventing the entry of paper sheets and dust into the unit, and the light emitted from the third light source of the tape detecting means passes through the optical glass. 49. The paper sheet processing apparatus according to claim 48, wherein the paper sheet is irradiated.   Antireflection for preventing the light emitted from the third light source of the tape detecting means from being reflected on the surface of the optical glass and causing unnecessary optical information in the unit. 53. The paper sheet processing apparatus according to claim 52, wherein a film is applied.   49. The paper sheet processing apparatus according to claim 48, wherein the second light source of the reflected image detection means and the third light source of the tape detection means are turned on simultaneously.   The second light source of the reflected image detecting means and the third light source of the tape detecting means are LED, fluorescent tube, cold cathode tube, EL (electro-luminescence) element, hot cathode tube, incandescent bulb, halogen light source. 49. The paper sheet processing apparatus according to claim 48, wherein any one of a light source and a xenon light source is used.   49. A regulating means for regulating fluttering of the paper sheets irradiated with light from the second light source of the reflected image detecting means and the third light source of the tape detecting means. Paper sheet processing equipment.   49. The paper sheet processing apparatus according to claim 48, wherein the third light source of the tape detecting means is a light guide tube or a cell guide that uses an LED as a light source and diffuses and emits light with a resin such as acrylic.

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