JP2010072933A - Fluorescence detection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and high-performance fluorescence detection apparatus capable of detecting a plurality of waveform characteristics at high performance using one detection system. <P>SOLUTION: The fluorescence detection apparatus detects a fluorescent material printing unit 11 which, in response to excitation light beams having a plurality of different wavelengths, emits light beams with a plurality of wavelengths different from the excitation light beams. The fluorescence detection apparatus includes an illuminating unit 12 for applying a plurality of excitation light beams of different wavelengths for exciting the fluorescent material printing unit to the fluorescent material printing unit, a detector 20 for detecting light emissions of a plurality of wavelength bands from the fluorescent material printing unit, and a true/false determining unit 16 for detecting whether the fluorescent material printing unit is true or false according to the light emissions detected by the detector. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fluorescence detection device that detects a phosphor attached to a paper sheet and the like and determines the authenticity of the paper sheet.

  2. Description of the Related Art In recent years, fluorescent sheets for the purpose of authenticity determination are applied to paper sheets such as banknotes. As a device for detecting the phosphor printing applied to such paper sheets, “a security information medium reader disclosed in Patent Document 1 has been proposed. This information medium reader includes an infrared light emitting LED, An ultraviolet light-emitting LED and a visible light-emitting LED are provided, the excitation order of the phosphor printing is read by the imaging device by switching the light emission order of these LEDs and emitting light by combining these LEDs.

  The “security information medium reading device” disclosed in Patent Document 2 sequentially irradiates an infrared light emitting LED, an ultraviolet light emitting LED, and a visible light emitting LED onto a phosphor print, images it with a CCD camera, captures a fluorescent pattern image,・ Proposes a technology for displaying high-definition patterns on personal computer monitors.

  The “security information visual judgment device” disclosed in Patent Document 3 proposes a technique for visually reading information obtained by the “security information medium reader” disclosed in Patent Document 2 described above.

  Patent Document 4 discloses a “banknote identification device” that excites a phosphor applied to a banknote using a light emitting diode that emits purple light, red light, and infrared light.

  Patent Document 5 proposes an “identification method and identification device” that simultaneously measures two or more different emission characteristics and / or afterglow characteristics spectra.

  The “image detection apparatus and automatic cash reading apparatus using the same” disclosed in Patent Document 6 includes a plurality of light emitting units that emit light having a plurality of different wavelengths, and emission or reflection from an object by light irradiation from the light emitting units. And a plurality of light receiving means for receiving the received light.

In the “identification method and identification device using an identification mark” disclosed in Patent Document 7, the identification mark is irradiated with excitation light from two or more types of excitation light sources to obtain a fluorescence spectrum, and this fluorescence is obtained. A two-dimensional pattern based on the spectrum is displayed.
JP 2007-328551 A JP 2007-193387 A JP 2007-193386 A JP 2006-318252 A JP 2006-275578 A JP 2003-208650 A JP 2001-356589 A

  However, in the various identification devices and reading devices described above, one detection unit is provided for a phosphor having one excitation emission characteristic. In the case of detecting a phosphor in which a plurality of phosphors having different excitation emission characteristics are mixed or overprinted, it is not possible to make a true / false judgment by detecting all of these emission by one detection unit. For this reason, when detecting the authenticity of paper sheets with phosphors that have been mixed or overprinted with multiple phosphors with different excitation emission characteristics, a detection system that matches the different excitation emission characteristics is required. It is necessary to provide a plurality of detection units. From this, the whole apparatus was large.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a compact and high-performance fluorescence detection apparatus that can detect a plurality of wavelength characteristics with a single detection system with high performance. is there.

  A fluorescence detection apparatus according to an aspect of the present invention is a fluorescence detection apparatus that detects a phosphor printing unit that emits light at a plurality of wavelengths different from the excitation light, with respect to a plurality of excitation lights of different wavelengths, An illumination device for irradiating the phosphor printing unit with a plurality of excitation lights having different wavelengths for exciting the phosphor printing unit, a detector for detecting light emission in a plurality of wavelength bands emitted from the phosphor printing unit, and A true / false determination unit that determines the authenticity of the phosphor printing unit based on the light emission state detected by the detector.

  A fluorescence detection apparatus according to another aspect of the present invention is a fluorescence detection apparatus that detects a phosphor printing unit that emits light at a plurality of wavelengths different from the excitation light, with respect to a plurality of excitation lights of different wavelengths. An illumination device for irradiating the phosphor printing unit with a plurality of excitation lights having different wavelengths for exciting the phosphor printing unit, and a detector for detecting light emission in a plurality of wavelength bands emitted from the phosphor printing unit, A true / false determination unit that determines the authenticity of the phosphor printing unit using a color difference based on light emission detected by the detector.

  According to the above configuration, it is possible to detect a plurality of wavelength characteristics with high performance by one detection system, to enable highly accurate authenticity determination processing, and to provide a compact fluorescence detection apparatus.

A fluorescence detection apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view schematically showing a fluorescence detection device according to an embodiment.

  As shown in FIG. 1, the fluorescence detection apparatus includes, as an inspection medium, a transport mechanism 10 that transports, for example, a standard paper sheet 8 with a phosphor printing unit 11 attached along a predetermined transport direction B, and a phosphor. An illumination device 12 that irradiates the paper 8 with illumination light that excites the printing unit 11, a detection system 14 that detects fluorescence emission from the phosphor printing unit 11, and a paper sheet based on the fluorescence emission detected by the detection system 14 A true / false determination processing unit 16 for determining whether the class 8 is true or false is provided.

  The transport mechanism 10 includes a plurality of transport rollers 7 that sandwich and transport the paper sheet 8, a belt (not shown), a plurality of guides, and the like. The standard paper sheets 8 are conveyed in the direction of arrow B by the conveying roller 7. Here, a plurality of phosphors having a plurality of different excitation emission characteristics are mixed or overprinted on the phosphor printing unit 11 affixed on the paper sheet 8. As an example, the phosphor printing unit 11 includes a phosphor that is excited by the excitation wavelength λx1 and emits light at the fluorescence emission wavelength λm1 and a phosphor that is excited by the excitation wavelength λx2 and emits light at the fluorescence emission wavelength λm2.

  The illuminating device 12 is arranged at a predetermined angular position with respect to the paper sheet 8 and irradiates the entire phosphor printing unit 11 attached to the paper sheet 8 with excitation light. The light emitted from the illumination device 12 includes a wavelength band in which the phosphor printing unit 11 emits excitation light, that is, at least the wavelength bands of the excitation wavelengths λx1 and λx2.

  The phosphor printing unit 11 excited by the illumination light emits fluorescence at the fluorescence emission wavelengths λm1 and λm2, and the light is detected by the detection system 14. The light detected by the detection system 14 is converted into an electrical signal, sent to the authenticity determination processing unit 16, and the authenticity of the paper sheet 8, that is, the phosphor printing unit 11, is determined.

  In this embodiment, the paper sheet 8 is transported by the transport mechanism 10. However, the present invention is not limited to this, and the paper sheet 8 is provided stationary at a predetermined inspection position. Also good.

  Hereinafter, in order to realize the above-described series of detection operations, a plurality of embodiments described below in which the number of illumination lights, the number of light receiving sensors to be detected, and the illumination light lighting method are variously combined will be described.

1) Multiple illumination light, multiple light receiving sensors, individual lighting system
2) Multiple illumination lights, multiple light receiving sensors, simultaneous lighting system
3) Multiple illumination lights, one light receiving sensor, individual lighting system
4) Multiple illumination lights, one light receiving sensor, simultaneous lighting system
5) One illumination light, multiple light receiving sensors, simultaneous lighting system
6) One illumination light, one light receiving sensor, and illumination simultaneous lighting system.

(First embodiment)
A first embodiment using a plurality of illumination lights, a plurality of light receiving sensors, and an illumination individual lighting method will be described.
The phosphor printing unit 11 to be detected is a mixture of a phosphor excited at the excitation wavelength λx1 and emitting at the fluorescence emission wavelength λm1, and a phosphor excited at the excitation wavelength λx2 and emitted at the fluorescence emission wavelength λm2, or It is assumed that they are formed to overlap each other.

  FIG. 2 shows the illumination device 12, the detection system 14, and the paper sheet 8 of the fluorescence detection device. As shown in FIG. 2, the illuminating device 12 has two light sources 2a and 2b. The light source 2a emits light having a wavelength λx1, and the light source 2b emits light having a wavelength λx2. These light sources 2a and 2b are arranged in one housing. The light sources 2a and 2b can be realized by using LEDs or lasers having predetermined wavelengths, but are not limited thereto.

  The detector 20 constituting the detection system 14 has two light receiving sensors 5a and 5b, and these light receiving sensors 5a and 5b are arranged in one casing. The light receiving sensor 5a is sensitive to the fluorescence emission wavelength λm1 of the phosphor printing unit 11, and the light receiving sensor 5b is sensitive to the fluorescence emission wavelength λm2 of the phosphor printing unit 11.

  As shown in FIG. 3, the true / false determination processing unit 16 latches output signals from the sample hold circuits 21a and 21b, which hold output signals from the light receiving sensors 5a and 5b, respectively, and the sample hold circuits 21a and 21b, for example. And an AND circuit 23 that outputs a response signal in response to an output from the latch circuit 22, and a CPU 24 that performs authenticity determination in accordance with an output from the AND circuit 23. A memory 25 that stores predetermined data is connected to the CPU 24. Further, the CPU 24 functions as a light source emission control unit, and controls alternate lighting and simultaneous lighting of the light sources 2a and 2b in the lighting device 12 via a driver (not shown).

The detection operation of the fluorescence detection apparatus configured as described above will be described.
FIG. 4 is a timing chart showing the output timing of each signal, and FIG. 5 is a flowchart showing the detection operation.

  As shown in FIGS. 4 and 5, when the paper sheet 8 is conveyed to a predetermined detection position by the conveyance mechanism 10, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11. In the individual lighting system, first, only the light source 2 a is turned on under the control of the CPU 24. The phosphor printing unit 11 emits fluorescence with the wavelength λm1 by the light with the wavelength λx1 emitted from the light source 2a. This fluorescence emission is received by the light receiving sensors 5a and 5b. The light receiving sensor 5a is sensitive to the wavelength λm1, and converts the received fluorescent light emission having the wavelength λm1 into an electric signal and outputs it. Since the light receiving sensor 5b is not sensitive to the wavelength λm1, there is no electrical signal output.

  Next, the light source 2a is turned off and the light source 2b is turned on. The phosphor printing unit 11 emits fluorescence at the wavelength λm2 by the light with the wavelength λx2 emitted from the light source 2b. This fluorescence emission is received by the light receiving sensors 5a and 5b. The light receiving sensor 5b is sensitive to the wavelength λm2, converts the received fluorescent light having the wavelength λm2 into an electrical signal, and outputs the electrical signal. Since the light receiving sensor 5a is not sensitive to the wavelength λm2, there is no electrical signal output.

  Next, in the authenticity determination processing unit 16, when the light sources 2a and 2b are individually turned on, the phosphor printing unit 11 is affixed by identifying whether or not the light receiving sensors 5a and 5b respectively have outputs. The authenticity of the paper sheet 8 is determined. As shown in FIG. 6, only the light receiving sensor 5a is output when only the light source 2a is turned on, and only when the light receiving sensor 5b is output only when the light source 2b is turned on, the phosphor printing unit 11 Is true, that is, the paper sheet 8 is true, otherwise it is false. In the present embodiment, the AND circuit 23 outputs a detection signal only when both the output of the light receiving sensor 5a and the output of the light receiving sensor 5b are output from the latch circuit 22, and the CPU 24 responds to the detection signal with the paper. The leaf 8 is determined to be true.

  According to the fluorescence detection apparatus configured as described above, it is possible to detect a plurality of wavelength features with high performance by one detection system, and it is possible to perform a true / false determination process with high accuracy. At the same time, a compact fluorescence detection device can be obtained.

(Second Embodiment)
A second embodiment using a plurality of illumination lights, a plurality of light receiving sensors, and an illumination simultaneous lighting method will be described.
The phosphor printing unit 11 to be detected is a mixture of a phosphor excited at the excitation wavelength λx1 and emitting at the fluorescence emission wavelength λm1, and a phosphor excited at the excitation wavelength λx2 and emitted at the fluorescence emission wavelength λm2, or It is assumed that they are formed to overlap each other.

  As shown in FIG. 2, the illumination device 12 includes two light sources 2a and 2b, as in the first embodiment described above. The light source 2a emits light having a wavelength λx1, and the light source 2b emits light having a wavelength λx2. These light sources 2a and 2b are arranged in one housing. The light sources 2a and 2b can be realized by using LEDs or lasers having predetermined wavelengths, but are not limited thereto.

  The detector 20 constituting the detection system 14 has two light receiving sensors 5a and 5b, and these light receiving sensors 5a and 5b are arranged in one casing. The light receiving sensor 5a is sensitive to the fluorescence emission wavelength λm1 of the phosphor printing unit 11, and the light receiving sensor 5b is sensitive to the fluorescence emission wavelength λm2 of the phosphor printing unit 11.

  As shown in FIG. 7, the authenticity determination processing unit 16 outputs, for example, an AND circuit 23 that outputs a response signal according to output signals from the light receiving sensors 5a and 5b, and an output from the AND circuit 23. A CPU 24 for performing authenticity determination is provided. A memory 25 that stores predetermined data is connected to the CPU 24. Further, the CPU 24 functions as a light source emission control unit, and controls lighting of the light sources 2a and 2b in the illumination device 12 via a driver (not shown).

The detection operation of the fluorescence detection device will be described.
FIG. 8 is a flowchart showing the detection operation, and FIG. 9 shows a determination table.

  When the paper sheet 8 is conveyed to a predetermined detection position, as shown in FIG. 8, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11. In the simultaneous lighting system, the light sources 2a and 2b are simultaneously turned on under the control of the CPU 24, and the fluorescent light from the phosphor printing unit 11 is received by the light receiving sensors 5a and 5b. The phosphor printing unit 11 emits fluorescence at the wavelength λm1 by the light of wavelength λx1 emitted from the light source 2a, and the light receiving sensor 5a is sensitive to the wavelength λm1, and converts the received fluorescence emission of the wavelength λm1 into an electrical signal. Output. The phosphor printing unit 11 emits fluorescence at the wavelength λm2 by the light having the wavelength λx2 emitted from the light source 2b, and the light receiving sensor 5b has sensitivity to the wavelength λm2, and converts the received fluorescence emission at the wavelength λm2 into an electrical signal. Output.

  The authenticity determination processing unit 16 discriminates whether or not the light receiving sensors 5a and 5b respectively obtain outputs when the light sources 2a and 2b are simultaneously turned on, thereby the paper sheet to which the phosphor printing unit 11 is attached. The true / false of the class 8 is determined. As shown in FIG. 9, when the light sources 2a and 2b are turned on simultaneously, the paper sheet 8 is true only when signal output is obtained from both the light receiving sensor 5a and the light receiving sensor 5b, and false otherwise. is there. In the present embodiment, the AND circuit 23 outputs a detection signal only when signal outputs are input from both the light receiving sensor 5a and the light receiving sensor 5b, and the CPU 24 determines that the paper sheet 8 is true according to the detection signal. It is determined that

  According to the fluorescence detection apparatus configured as described above, it is possible to detect a plurality of wavelength features with high performance by one detection system, and it is possible to perform a true / false determination process with high accuracy. At the same time, a compact fluorescence detection device can be obtained. Further, since the two light sources are turned on simultaneously, the light source control becomes easy.

(Third embodiment)
A third embodiment using a plurality of illumination lights, one light receiving sensor, and an illumination individual lighting method will be described.
The phosphor printing unit 11 to be detected is a mixture of a phosphor excited at the excitation wavelength λx1 and emitting at the fluorescence emission wavelength λm1, and a phosphor excited at the excitation wavelength λx2 and emitted at the fluorescence emission wavelength λm2, or It is assumed that they are formed to overlap each other.

  As shown in FIG. 10, the illuminating device 12 has two light sources 2a and 2b. The light source 2a emits light having a wavelength λx1, and the light source 2b emits light having a wavelength λx2. These light sources 2a and 2b are arranged in one housing. The light sources 2a and 2b can be realized by using LEDs or lasers having predetermined wavelengths, but are not limited thereto.

  The detector 20 constituting the detection system 14 transmits only light in a predetermined plurality of different fluorescence emission wavelength bands among one light receiving sensor 5 having sensitivity in a broad band and light incident on the light receiving sensor 5. And a filter 6. The light receiving sensor 5 has sensitivity to fluorescence emission of the wavelength λm1 and the wavelength λm2 from the phosphor printing unit 11. This can be realized using filter work.

  As shown in FIG. 11, the authenticity determination processing unit 16, for example, samples and hold circuits 21 a and 21 b that respectively hold output signals from the light receiving sensor 5, and output signals from the light receiving sensor 5 according to the light source lighting control signal. A switch 26 that distributes the signal to the sample and hold circuits 21a and 21b, a latch circuit 22 that latches an output signal from the sample and hold circuits 21a and 21b, an AND circuit 23 that outputs a response signal in response to an output from the latch circuit 22, and In addition, a CPU 24 that performs authenticity determination according to the output from the AND circuit 23 is provided. A memory 25 that stores predetermined data is connected to the CPU 24. Further, the CPU 24 functions as a light source emission control unit, and controls alternate lighting and simultaneous lighting of the light sources 2a and 2b in the lighting device 12 via a driver (not shown).

The detection operation of the fluorescence detection apparatus configured as described above will be described.
FIG. 12 is a timing chart showing the output timing of each signal, and FIG. 13 is a flowchart showing the detection operation.

  As shown in FIGS. 12 and 13, when the paper sheet 8 is conveyed to a predetermined detection position by the conveyance mechanism 10, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11. In the individual lighting system, first, only the light source 2 a is turned on under the control of the CPU 24. The phosphor printing unit 11 emits fluorescence with the wavelength λm1 by the light with the wavelength λx1 emitted from the light source 2a. This fluorescence emission passes through the filter 6 and is received by the light receiving sensor 5. The light receiving sensor 5 is sensitive to the wavelength λm1 and converts the received fluorescent light emission having the wavelength λm1 into an electric signal and outputs it.

  Next, the light source 2a is turned off and the light source 2b is turned on. The phosphor printing unit 11 emits fluorescence at the wavelength λm2 by the light with the wavelength λx2 emitted from the light source 2b. This fluorescence emission passes through the filter 6 and is received by the light receiving sensor 5. The light receiving sensor 5 is sensitive to the wavelength λm2, and converts the received fluorescence emission having the wavelength λm2 into an electrical signal and outputs the electrical signal.

  Next, the authenticity determination processing unit 16 identifies whether or not outputs corresponding to the wavelengths λm1 and λm2 are obtained by the light receiving sensor 5 when the light sources 2a and 2b are individually turned on, thereby printing the phosphor. The authenticity of the paper sheet 8 to which the part 11 is attached is determined. As shown in FIG. 14, only when the output of the light receiving sensor 5 is obtained when only the light source 2a is lit and when the output of the light receiving sensor 5 is obtained when only the light source 2b is lit, the phosphor printing unit 11 Is true, that is, the paper sheet 8 is true, otherwise it is false.

  In the present embodiment, by switching the switch 26 according to the lighting of the light sources 2a and 2b, the signal output of the light receiving sensor 5 obtained when the light source 2a is turned on is sent to one sample and hold circuit 21a. The signal output of the light receiving sensor 5 obtained when the light source 2b is turned on is sent to the other sample and hold circuit 21b. The AND circuit 23 outputs a detection signal only when signals are output from both the sample hold circuits 21a and 21b from the latch circuit 22, and the CPU 24 determines that the paper sheet 8 is true according to the detection signal. To do.

  According to the fluorescence detection apparatus configured as described above, it is possible to detect a plurality of wavelength features with high performance by one detection system, and it is possible to perform a true / false determination process with high accuracy. At the same time, a more compact fluorescence detection device can be obtained.

(Fourth embodiment)
A fourth embodiment using a plurality of illumination lights, one light receiving sensor, and an illumination simultaneous lighting method will be described.
The phosphor printing unit 11 to be detected is a mixture of a phosphor excited at the excitation wavelength λx1 and emitting at the fluorescence emission wavelength λm1, and a phosphor excited at the excitation wavelength λx2 and emitted at the fluorescence emission wavelength λm2, or It is assumed that they are formed to overlap each other.

  As shown in FIG. 10, the illuminating device 12 has two light sources 2a and 2b. The light source 2a emits light having a wavelength λx1, and the light source 2b emits light having a wavelength λx2. These light sources 2a and 2b are arranged in one housing. The light sources 2a and 2b can be realized by using LEDs or lasers having predetermined wavelengths, but are not limited thereto.

  The detector 20 has one light receiving sensor 5 having sensitivity in a broad band, and a filter 6 that transmits only light in a plurality of different fluorescence emission wavelength bands among the light incident on the light receiving sensor 5. is doing. As a result, the light receiving sensor 5 is sensitive to fluorescence emission of the wavelength λm1 and the wavelength λm2 from the phosphor printing unit 11.

  As illustrated in FIG. 15, the authenticity determination processing unit 16 includes, for example, a comparator 30 that compares an output signal level from the light receiving sensor 5 with a predetermined threshold, and a CPU 24 that performs authenticity determination according to an output from the comparator. A memory 25 for storing predetermined data such as the above-described threshold is provided. Further, the CPU 24 functions as a light source emission control unit, and controls lighting of the light sources 2a and 2b in the illumination device 12 via a driver (not shown).

The detection operation of the fluorescence detection device will be described.
FIG. 16 is a flowchart showing the detection operation, and FIG. 17 shows a determination table.
When the paper sheet 8 is conveyed to a predetermined detection position, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11 as shown in FIG. In the simultaneous lighting system, the light sources 2 a and 2 b are simultaneously turned on under the control of the CPU 24, and the fluorescent light emitted from the phosphor printing unit 11 is received by the light receiving sensor 5. The phosphor printing unit 11 emits fluorescence at wavelengths λm1 and λm2 by light having wavelengths λx1 and λx2 emitted from the light sources 2a and 2b. The fluorescent light is transmitted through the filter 6 and received by the light receiving sensor 5. The light receiving sensor 5 converts the received fluorescent light emission into an electrical signal and outputs it.

  The authenticity determination processing unit 16 determines the authenticity of the paper sheet 8 to which the phosphor printing unit 11 is attached by determining the output level of the light receiving sensor 5 when the light sources 2a and 2b are simultaneously turned on. . As shown in FIG. 9, when the light sources 2a and 2b are turned on at the same time, the paper sheet 8 is true only when the signal output of the light receiving sensor 5 exceeds a predetermined threshold, and false otherwise. In the present embodiment, the comparator 30 compares the signal output level from the light receiving sensor 5 with a threshold value, and outputs a detection signal corresponding to the comparison result, and the CPU 24 determines the paper sheet 8 according to the detection signal. Judgment of authenticity.

  According to the fluorescence detection apparatus configured as described above, it is possible to detect a plurality of wavelength features with high performance by one detection system, and it is possible to perform a true / false determination process with high accuracy. At the same time, by using one light receiving sensor, a more compact fluorescence detection device can be obtained. Further, since the two light sources are turned on simultaneously, the light source control becomes easy.

(Fifth embodiment)
A fifth embodiment using one illumination light, a plurality of light receiving sensors, and an illumination simultaneous lighting method will be described.
The phosphor printing unit 11 to be detected is a mixture of a phosphor excited at the excitation wavelength λx1 and emitting at the fluorescence emission wavelength λm1, and a phosphor excited at the excitation wavelength λx2 and emitted at the fluorescence emission wavelength λm2, or It is assumed that they are formed to overlap each other.

  As illustrated in FIG. 18, the illumination device 12 includes one light source 2 and a filter 9 that transmits only light in a predetermined plurality of different wavelength bands. The light source 2 has a broad wavelength band such as halogen, and a predetermined illuminating device can be obtained by transmitting only light having wavelengths λx1 and λx2 through the filter 9 out of light emitted from the light source. . However, the lighting device is not limited to this.

  The detector 20 constituting the detection system 14 has two light receiving sensors 5a and 5b, and these light receiving sensors 5a and 5b are arranged in one casing. The light receiving sensor 5a is sensitive to the fluorescence emission wavelength λm1 of the phosphor printing unit 11, and the light receiving sensor 5b is sensitive to the fluorescence emission wavelength λm2 of the phosphor printing unit 11.

  As shown in FIG. 19, the authenticity determination processing unit 16 outputs, for example, an AND circuit 23 that outputs a response signal according to output signals from the light receiving sensors 5a and 5b, and an output from the AND circuit 23. A CPU 24 for performing authenticity determination is provided. A memory 25 that stores predetermined data is connected to the CPU 24. Moreover, CPU24 functions as a light source light emission control part, and controls lighting of the light source 2 in the illuminating device 12 via the driver which is not shown in figure.

The detection operation of the fluorescence detection device will be described.
FIG. 20 is a flowchart showing the detection operation, and FIG. 21 shows a determination table.

  When the paper sheet 8 is conveyed to a predetermined detection position, as shown in FIGS. 18 and 20, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11. In the simultaneous lighting system, the light source 2 is turned on under the control of the CPU 24, and the light emission sensors 5a and 5b receive the fluorescence emission from the phosphor printing unit 11. The phosphor printing unit 11 emits fluorescence with wavelengths λm1 and λm2 by light of wavelength λx1 and wavelength λx2 emitted from the light source 2. The light receiving sensor 5a is sensitive to the wavelength λm1, and converts the received fluorescent light emission having the wavelength λm1 into an electric signal and outputs it. However, since the light receiving sensor 5a does not have sensitivity with respect to the light of the wavelength λm2, there is no output for this. The light receiving sensor 5b is sensitive to the wavelength λm2, converts the received fluorescent light having the wavelength λm2 into an electrical signal, and outputs the electrical signal. However, since the light receiving sensor 5b does not have sensitivity with respect to the light of the wavelength λm1, there is no output for this.

  When the light source 2 is turned on, the authenticity determination processing unit 16 identifies whether or not a signal output is obtained by each of the light receiving sensors 5a and 5b, whereby the paper sheet 8 to which the phosphor printing unit 11 is attached is identified. Judgment of true or false. As shown in FIG. 21, when the light source 2 is turned on, the paper sheet 8 is true only when signal outputs are obtained from both the light receiving sensor 5a and the light receiving sensor 5b, and the others are false. In the present embodiment, the AND circuit 23 outputs a detection signal only when signal outputs are input from both the light receiving sensor 5a and the light receiving sensor 5b, and the CPU 24 determines that the paper sheet 8 is true according to the detection signal. It is determined that

  According to the fluorescence detection apparatus configured as described above, it is possible to detect a plurality of wavelength features with high performance by one detection system, and it is possible to perform a true / false determination process with high accuracy. At the same time, since there is one light source, a more compact fluorescence detection device can be obtained and light source control is facilitated.

(Sixth embodiment)
A sixth embodiment using one illumination light, one light receiving sensor, and an illumination simultaneous lighting method will be described.
The phosphor printing unit 11 to be detected is a mixture of a phosphor excited at the excitation wavelength λx1 and emitting at the fluorescence emission wavelength λm1, and a phosphor excited at the excitation wavelength λx2 and emitted at the fluorescence emission wavelength λm2, or It is assumed that they are formed to overlap each other.

  As illustrated in FIG. 22, the illumination device 12 includes one light source 2 and a filter 9 that transmits only light in a predetermined plurality of different wavelength bands. The light source 2 has a broad wavelength band such as halogen, and a predetermined illuminating device can be obtained by transmitting only light having wavelengths λx1 and λx2 through the filter 9 out of light emitted from the light source. . However, the lighting device is not limited to this.

  The detector 20 constituting the detection system 14 transmits only light in a predetermined plurality of different fluorescence emission wavelength bands among one light receiving sensor 5 having sensitivity in a broad band and light incident on the light receiving sensor 5. And a filter 6. The light receiving sensor 5 has sensitivity to fluorescence emission of the wavelength λm1 and the wavelength λm2 from the phosphor printing unit 11. This can be realized using filter work.

  As illustrated in FIG. 23, the authenticity determination processing unit 16 includes, for example, a comparator 30 that compares an output signal level from the light receiving sensor 5 with a predetermined threshold, and a CPU 24 that performs authenticity determination according to an output from the comparator. A memory 25 for storing predetermined data such as the above-described threshold is provided. Moreover, CPU24 functions as a light source light emission control part, and controls lighting of the light source 2 in the illuminating device 12 via the driver which is not shown in figure.

The detection operation of the fluorescence detection device will be described.
FIG. 24 is a flowchart showing the detection operation, and FIG. 25 shows a determination table.
When the paper sheet 8 is conveyed to a predetermined detection position, as shown in FIGS. 22 and 24, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11. In the illumination simultaneous lighting method, the light source 2 is turned on under the control of the CPU 24, and the light receiving sensor 5 receives the fluorescence emission from the phosphor printing unit 11. The phosphor printing unit 11 emits fluorescence at wavelengths λm1 and λm2 by light of wavelengths λx1 and λx2 emitted from the light source 2. The fluorescent light is transmitted through the filter 6 and received by the light receiving sensor 5. The light receiving sensor 5 converts the received fluorescent light emission into an electrical signal and outputs it.

  The authenticity determination processing unit 16 determines the authenticity of the paper sheet 8 to which the phosphor printing unit 11 is attached by determining the output level of the light receiving sensor 5 when the light source 2 is turned on. As shown in FIG. 25, when the light source 2 is turned on, the paper sheet 8 is true only when the signal output of the light receiving sensor 5 exceeds a predetermined threshold, and false otherwise. In the present embodiment, the comparator 30 compares the signal output level from the light receiving sensor 5 with a threshold value, and outputs a detection signal corresponding to the comparison result, and the CPU 24 determines the paper sheet 8 according to the detection signal. Judgment of authenticity.

  According to the fluorescence detection apparatus configured as described above, it is possible to detect a plurality of wavelength features with high performance by one detection system, and it is possible to perform a true / false determination process with high accuracy. At the same time, by using one light source and one light receiving sensor, a more compact fluorescence detection device can be obtained. Moreover, light source control becomes easy.

  In the first to sixth embodiments described above, the case where the emission wavelength of the phosphor printing unit 11 is two wavelengths has been described. However, the present invention is not limited to this, and a phosphor having an emission wavelength of three or more wavelengths is not limited thereto. It can also be applied to detection.

  Next, a description will be given of a phosphor detection apparatus in the case of detecting the phosphor printing unit 11 that is limited in excitation wavelength and fluorescence wavelength.

(Seventh embodiment)
As an example, the phosphor printing unit 11 to be detected is a mixture of a phosphor that is excited to the excitation wavelength λx1 and emits light at the fluorescence emission wavelength λm1, and a phosphor that is excited to the excitation wavelength λx2 and emits light at the fluorescence emission wavelength λm2. Alternatively, it is assumed that they are formed in layers.

As shown in FIG. 26, when both phosphors forming the phosphor printing unit 11 are wavelength down-conversion (down-conversion) phosphors, that is,
(Λx1, λx2) <(λm1, λm2)
When the above relationship holds, the illumination device 12 of the fluorescence detection device uses a light source and a filter that transmits light having a wavelength of λc or less in FIG. 26 among the light emitted from the light source. The detector 20 uses a filter that transmits a wavelength of λc or more and a light receiving sensor that receives light transmitted through the filter. This simplifies the filter work, and as in the above-described embodiment, a single detection system can detect a plurality of wavelength features with high performance, and enables highly accurate authenticity determination processing. A simple fluorescence detector.

(Eighth embodiment)
As an example, the phosphor printing unit 11 to be detected is a mixture of a phosphor that is excited to the excitation wavelength λx1 and emits light at the fluorescence emission wavelength λm1, and a phosphor that is excited to the excitation wavelength λx2 and emits light at the fluorescence emission wavelength λm2. Alternatively, it is assumed that they are formed in layers.

As shown in FIG. 27, when one of the phosphors forming the phosphor printing unit 11 is a wavelength down-conversion (down-conversion) phosphor and the other is a wavelength up-conversion (up-conversion) phosphor, that is, λx1 < (Λm1, λm2) <λx2
When the above relationship is established, the detector 20 of the fluorescence detection apparatus uses a filter that transmits only wavelengths of λc1 to λc2 shown in FIG. 27 and a light receiving sensor that receives light transmitted through the filter. This simplifies the filter work, and as in the above-described embodiment, a single detection system can detect a plurality of wavelength features with high performance, and enables highly accurate authenticity determination processing. A simple fluorescence detector.

(Ninth embodiment)
As an example, the phosphor printing unit 11 to be detected is a mixture of a phosphor that is excited to the excitation wavelength λx1 and emits light at the fluorescence emission wavelength λm1, and a phosphor that is excited to the excitation wavelength λx2 and emits light at the fluorescence emission wavelength λm2. Alternatively, it is assumed that they are formed in layers.

As shown in FIG. 28, when both phosphors forming the phosphor printing unit 11 are wavelength up-conversion (up-conversion) phosphors, that is,
(Λx1, λx2)> (λm1, λm2)
When the above relationship holds, the illumination device 12 of the fluorescence detection device uses a light source and a filter that transmits light having a wavelength of λc or more in FIG. 27 among the light emitted from the light source. The detector 20 uses a filter that transmits a wavelength of λc or less and a light receiving sensor that receives light transmitted through the filter. This simplifies the filter work, and as in the above-described embodiment, a single detection system can detect a plurality of wavelength features with high performance, and enables highly accurate authenticity determination processing. A simple fluorescence detector.

(Tenth embodiment)
Next, a fluorescence detection apparatus according to the tenth embodiment using a color sensor as a detection system will be described. As shown in FIG. 1, the fluorescence detection apparatus, as shown in FIG. 1, for example, forms a standard paper sheet 8 to which the phosphor printing unit 11 is attached along a predetermined conveyance direction B as an inspection medium. Detected by a transport mechanism 10 that transports, an illumination device 12 that irradiates the paper 8 with illumination light that excites the phosphor printing unit 11, a detection system 14 that detects fluorescence emission from the phosphor printing unit 11, and a detection system 14. A true / false determination processing unit 16 is provided for determining the authenticity of the paper sheet 8 based on the fluorescence emission. The authenticity determination processing unit 16 calculates the color difference of the fluorescence emission based on the obtained information, and performs authenticity determination.

In the present embodiment, a plurality of illumination light and illumination individual lighting methods are used.
As an example, the phosphor printing unit 11 to be detected is a mixture of a phosphor that is excited to the excitation wavelength λx1 and emits light at the fluorescence emission wavelength λm1, and a phosphor that is excited to the excitation wavelength λx2 and emits light at the fluorescence emission wavelength λm2. Alternatively, it is assumed that they are formed in layers.

As shown in FIG. 29, the illuminating device 12 has two light sources 2a and 2b. The light source 2a emits light having a wavelength λx1, and the light source 2b emits light having a wavelength λx2. These light sources 2a and 2b are arranged in one housing. The light sources 2a and 2b can be realized by using LEDs or lasers having predetermined wavelengths, but are not limited thereto.
The detector 20 constituting the detection system 14 includes, for example, an RGB color sensor 32 as a color sensor. The color sensor is not limited to this.

  FIG. 30 shows the R, G, B distribution of fluorescence emitted by the illumination light having the excitation wavelength, FIG. 31 is a flowchart showing the detection operation of the fluorescence detection device, and FIG. 32 shows the determination table.

  When the paper sheet 8 is transported to a predetermined detection position by the transport mechanism 10, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11. As shown in FIG. 31, in the individual lighting system, only the light source 2a is turned on. The phosphor printing unit 11 emits fluorescence with the wavelength λm1 by the light with the wavelength λx1 emitted from the light source 2a. This fluorescence emission is received by the RGB color sensor 32. As shown in FIG. 30A, the RGB color sensor 32 can obtain outputs of R, G, and B components specific to fluorescent light emission. The RGB color sensor 32 converts this output value into an electrical signal and sends it to the authenticity determination processing unit 16.

The true / false determination processing unit 16 calculates the color difference ΔE1 based on the output values of R, G, and B. The color difference is obtained by the following calculation formula (1) as an example, but is not limited to this calculation formula, and other formulas may be used as long as the color difference feature can be expressed.

  The authenticity determination processing unit 16 stores the values of the reference color difference ΔEref1 of the fluorescent light emission λm1 and the reference color difference ΔEref2 of the fluorescent light emission λm2 that are obtained in advance in a memory inside the authenticity determination processing unit 16.

  Next, the authenticity determination processing unit 16 compares the previously obtained color difference ΔE1 with the value of the reference color difference ΔEref1 read from the memory, and if the difference is within a predetermined allowable error range α1, the fluorescence emission λm1. Recognize that there was.

  Subsequently, the light source 2a is turned off and the light source 2b is turned on. The phosphor printing unit 11 emits fluorescence at the wavelength λm2 by the light with the wavelength λx2 emitted from the light source 2b. This fluorescence emission is received by the RGB color sensor 32. As shown in FIG. 30B, the RGB color sensor 32 can obtain outputs of R, G, and B components specific to fluorescent light emission. The RGB color sensor 32 converts this output value into an electrical signal and sends it to the authenticity determination processing unit 16.

  The true / false determination processing unit 16 calculates the color difference ΔE2 using the equation (1) based on the output values of R, G, and B. Further, the authenticity determination processing unit 16 compares the previously obtained color difference ΔE2 with the value of the reference color difference ΔEref2 read from the memory, and if the difference is within a predetermined allowable error range α2, the fluorescence emission λm2 is determined. Recognize that there was.

  The authenticity determination processing unit 3 performs the above processing, and as shown in FIG. 32, when both the fluorescent light emission λm1 and the fluorescent light emission λm2 are recognized, the phosphor printing unit 11 of the paper sheet 8 is determined to be true. Otherwise, it is determined to be false.

  The values of the allowable error ranges α1 and α2 used when determining the color difference can be arbitrarily set as parameters of the apparatus, and can be arbitrarily changed.

  Further, there is a method in which the values of the allowable error ranges α1 and α2 are determined from a result obtained by sampling a predetermined number of media for which the phosphor printing unit 11 is true.

  According to the present embodiment, a single detection system can detect a plurality of wavelength features with high performance, and a highly accurate authenticity determination process and a compact fluorescence detection apparatus can be obtained.

(Eleventh embodiment)
An eleventh embodiment using a plurality of illumination lights and a simultaneous lighting system will be described.
As an example, the phosphor printing unit 11 to be detected is a mixture of a phosphor that is excited to the excitation wavelength λx1 and emits light at the fluorescence emission wavelength λm1, and a phosphor that is excited to the excitation wavelength λx2 and emits light at the fluorescence emission wavelength λm2. Alternatively, it is assumed that they are formed in layers.

As shown in FIG. 29, also in this embodiment, the illuminating device 12 has two light sources 2a and 2b. The light source 2a emits light having a wavelength λx1, and the light source 2b emits light having a wavelength λx2. These light sources 2a and 2b are arranged in one housing. The light sources 2a and 2b can be realized by using LEDs or lasers having predetermined wavelengths, but are not limited thereto.
The detector 20 constituting the detection system 14 includes, for example, an RGB color sensor 32 as a color sensor. The color sensor is not limited to this.

  FIG. 33 shows the R, G, B distribution of the fluorescence emitted by the illumination light having the excitation wavelength, FIG. 34 is a flowchart showing the detection operation of the fluorescence detection apparatus, and FIG. 35 shows the determination table.

  When the paper sheet 8 is transported to a predetermined detection position by the transport mechanism 10, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11. As shown in FIG. 34, in the illumination simultaneous lighting method, first, the light sources 2a and 2b are simultaneously turned on. The phosphor printing unit 11 emits fluorescence at wavelengths λm1 and λm2 by the light of wavelength λx1 and the light of wavelength λx2 emitted from the light sources 2a and 2b. This fluorescence emission is received by the RGB color sensor 32. In the RGB color sensor 32, as shown in FIG. 33, the light λm obtained by combining the fluorescence emission λm1 and λm2 is input, and outputs of R, G, and B specific to the combined light can be obtained. The RGB color sensor 32 converts this output value into an electrical signal and sends it to the authenticity determination processing unit 16.

The true / false determination processing unit 16 calculates the color difference ΔE based on the output values of R, G, and B. The above-described equation (1) is used as the color difference calculation formula, but is not limited thereto.
The authenticity determination processing unit 16 stores the value of the reference color difference ΔEref of λm, which is a combined light of the fluorescent light emission λm1 and the fluorescent light emission λm2, which is obtained in advance, in a memory inside the authenticity determination processing unit 3.

  Next, the authenticity determination processing unit 16 compares the previously obtained color difference ΔE with the value of the reference color difference ΔEref read from the memory, and if the difference is within a predetermined allowable error range α, the fluorescence emission λm1. It is recognized that there was fluorescence emission λm2.

  The authenticity determination processing unit 16 performs the above processing, and as shown in FIG. 35, when the synthesized light λm can be recognized, that is, when both the fluorescent emission λm1 and the fluorescent emission λm2 exist, the phosphor printing unit 11 is determined to be true, otherwise it is determined to be false.

  The value of the allowable error range α used for determining the color difference can be arbitrarily set as a parameter of the apparatus, and can be arbitrarily changed. In addition, there is a method in which the value of the allowable error range α is determined from a result obtained by sampling a predetermined number of media for which the phosphor printing unit 11 is true.

  According to the present embodiment, a single detection system can detect a plurality of wavelength features with high performance, and a highly accurate authenticity determination process and a compact fluorescence detection apparatus can be obtained. Further, the light source can be easily controlled by simultaneously lighting the lights.

(Twelfth embodiment)
A twelfth embodiment using one illumination light, one color sensor, and an illumination simultaneous lighting method will be described.
The phosphor printing unit 11 to be detected is a mixture of a phosphor excited at the excitation wavelength λx1 and emitting at the fluorescence emission wavelength λm1, and a phosphor excited at the excitation wavelength λx2 and emitted at the fluorescence emission wavelength λm2, or It is assumed that they are formed to overlap each other.

  As shown in FIG. 36, the illuminating device 12 has one light source 2 and a filter 9 that transmits only light in a predetermined plurality of different wavelength bands. The light source 2 has a broad wavelength band such as halogen, and a predetermined illuminating device can be obtained by transmitting only light having wavelengths λx1 and λx2 through the filter 9 out of light emitted from the light source. . However, the lighting device is not limited to this.

  The detector 20 constituting the detection system 14 includes, for example, an RGB color sensor 32 as a color sensor. The color sensor is not limited to this.

  FIG. 37 is a flowchart showing the detection operation of the fluorescence detection apparatus, and FIG. 38 shows a determination table.

  When the paper sheet 8 is transported to a predetermined detection position by the transport mechanism 10, the fluorescence detection device starts fluorescence detection of the phosphor printing unit 11. As shown in FIG. 37, in the simultaneous lighting system, the light source 2 is first turned on. The phosphor printing unit 11 emits fluorescence at wavelengths λm1 and λm2 by the light of wavelength λx1 and the light of wavelength λx2 emitted from the light source 2. This fluorescence emission is received by the RGB color sensor 32. In the RGB color sensor 32, as shown in FIG. 33, the light λm obtained by combining the fluorescence emission λm1 and λm2 is input, and outputs of R, G, and B specific to the combined light can be obtained. The RGB color sensor 32 converts this output value into an electrical signal and sends it to the authenticity determination processing unit 16.

The true / false determination processing unit 16 calculates the color difference ΔE based on the output values of R, G, and B. The above-described equation (1) is used as the color difference calculation formula, but is not limited thereto.
The authenticity determination processing unit 16 stores the value of the reference color difference ΔEref of λm, which is a combined light of the fluorescent light emission λm1 and the fluorescent light emission λm2, which is obtained in advance, in a memory inside the authenticity determination processing unit 3.

  Next, the authenticity determination processing unit 16 compares the previously obtained color difference ΔE with the value of the reference color difference ΔEref read from the memory, and if the difference is within a predetermined allowable error range α, the fluorescence emission λm1. It is recognized that there was fluorescence emission λm2.

  The authenticity determination processing unit 16 performs the above processing, and as shown in FIG. 38, when the synthesized light λm can be recognized, that is, when both the fluorescent emission λm1 and the fluorescent emission λm2 exist, the phosphor printing unit 11 is determined to be true, otherwise it is determined to be false.

  The value of the allowable error range α used for determining the color difference can be arbitrarily set as a parameter of the apparatus, and can be arbitrarily changed. In addition, there is a method in which the value of the allowable error range α is determined from a result obtained by sampling a predetermined number of media for which the phosphor printing unit 11 is true.

  According to the present embodiment, a single detection system can detect a plurality of wavelength features with high performance, and a highly accurate authenticity determination process and a compact fluorescence detection apparatus can be obtained. Further, by using a single light source for the lighting device, the device can be made more compact and light source control is facilitated.

  In the tenth to twelfth embodiments described above, the case where the fluorescent emission wavelength of the phosphor printing unit 11 is two wavelengths has been described. However, the present invention is not limited to this, and the phosphor having an emission wavelength of three or more wavelengths is used. It can also be applied to detection.

The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
For example, the inspection medium to be inspected is not limited to the above-described paper sheets, but may be other inspection media such as cards, gift certificates, and securities.

FIG. 1 is a perspective view schematically showing an entire fluorescence detection apparatus according to an embodiment of the present invention. FIG. 2 is a side view showing the illumination device and detector of the fluorescence detection device according to the first embodiment. FIG. 3 is a block diagram illustrating a true / false determination processing unit of the fluorescence detection device according to the first embodiment. FIG. 4 is a timing chart showing signal output timing of each part in the fluorescence detection device according to the first embodiment. FIG. 5 is a flowchart showing a detection operation of the fluorescence detection apparatus according to the first embodiment. FIG. 6 is a diagram illustrating a determination table in the fluorescence detection device according to the first embodiment. FIG. 7 is a block diagram illustrating a true / false determination processing unit of the fluorescence detection device according to the second embodiment. FIG. 8 is a flowchart showing a detection operation of the fluorescence detection apparatus according to the second embodiment. FIG. 9 is a diagram illustrating a determination table in the fluorescence detection apparatus according to the second embodiment. FIG. 10 is a side view showing an illumination device and a detector of a fluorescence detection device according to a third embodiment. FIG. 11 is a block diagram illustrating the authenticity determination processing unit of the fluorescence detection device according to the third embodiment. FIG. 12 is a timing chart showing signal output timing of each part in the fluorescence detection device according to the third embodiment. FIG. 13 is a flowchart showing a detection operation of the fluorescence detection apparatus according to the third embodiment. FIG. 14 is a diagram illustrating a determination table in the fluorescence detection apparatus according to the third embodiment. FIG. 15 is a block diagram illustrating a true / false determination processing unit of the fluorescence detection apparatus according to the fourth embodiment. FIG. 16 is a flowchart showing a detection operation of the fluorescence detection apparatus according to the fourth embodiment. FIG. 17 is a diagram illustrating a determination table in the fluorescence detection device according to the fourth embodiment. FIG. 18 is a side view showing an illumination device and a detector of a fluorescence detection device according to a fifth embodiment. FIG. 19 is a block diagram illustrating a true / false determination processing unit of the fluorescence detection device according to the fifth embodiment. FIG. 20 is a flowchart showing a detection operation of the fluorescence detection apparatus according to the fifth embodiment. FIG. 21 is a diagram illustrating a determination table in the fluorescence detection apparatus according to the fifth embodiment. FIG. 22 is a side view showing an illumination device and a detector of a fluorescence detection device according to a sixth embodiment. FIG. 23 is a block diagram showing a true / false determination processing unit of the fluorescence detection apparatus according to the sixth embodiment. FIG. 24 is a flowchart showing a detection operation of the fluorescence detection apparatus according to the sixth embodiment. FIG. 25 is a diagram illustrating a determination table in the fluorescence detection apparatus according to the sixth embodiment. FIG. 26 is a diagram showing limitations on excitation wavelength and fluorescence wavelength in the seventh embodiment. FIG. 27 is a diagram showing the limitation of the excitation wavelength and the fluorescence wavelength in the eighth embodiment. FIG. 28 is a diagram showing limitations on excitation wavelength and fluorescence wavelength in the ninth embodiment. FIG. 29 is a side view showing the illumination device and detector of the fluorescence detection device according to the tenth embodiment. FIG. 30 is a diagram showing RGB output of fluorescence emission in the RGB color sensor. FIG. 31 is a flowchart showing a detection operation of the fluorescence detection apparatus according to the tenth embodiment. FIG. 32 is a diagram illustrating a determination table in the fluorescence detection device according to the tenth embodiment. FIG. 33 is a diagram showing RGB output of fluorescence emission in the RGB color sensor of the fluorescence detection device according to the eleventh embodiment. FIG. 34 is a flowchart showing a detection operation of the fluorescence detection apparatus according to the eleventh embodiment. FIG. 35 is a diagram illustrating a determination table in the fluorescence detection device according to the eleventh embodiment. FIG. 36 is a side view showing an illumination device and a detector of a fluorescence detection device according to a twelfth embodiment. FIG. 37 is a flowchart showing the detection operation of the fluorescence detection apparatus according to the twelfth embodiment. FIG. 38 is a diagram illustrating a determination table in the fluorescence detection device according to the twelfth embodiment.

Explanation of symbols

2, 2a, 2b ... light source, 5, 5a, 5b ... light receiving sensor, 6, 9 ... filter,
8 ... paper sheets, 10 ... conveying mechanism, 11 ... phosphor printing section, 12 ... illuminating device,
DESCRIPTION OF SYMBOLS 14 ... Detection system, 16 ... Authenticity determination process part, 20 ... Detector, 24 ... CPU, 25 ... Memory,
32 ... RGB color sensor

Claims (21)

A fluorescence detection device that detects a phosphor printing unit that emits light at a plurality of wavelengths different from the excitation light with respect to a plurality of excitation lights of different wavelengths,
An illumination device that irradiates the phosphor printing unit with a plurality of excitation lights having different wavelengths for exciting the phosphor printing unit, and
A detector for detecting light emission in a plurality of wavelength bands emitted from the phosphor printing unit;
Based on the light emission state detected by the detector, a true / false determination unit that determines the authenticity of the phosphor printing unit;
A fluorescence detection device comprising:   The fluorescence detection device according to claim 1, wherein the illumination device has a plurality of independent light sources for a plurality of different excitation wavelengths.   The illumination device includes one light source that emits light having a predetermined wavelength band, and a filter that transmits only excitation light having a plurality of different excitation wavelengths out of the emitted light emitted from the light source. The fluorescence detection device according to claim 1.   The fluorescence detector according to any one of claims 1 to 3, wherein the detector includes a plurality of light receiving sensors each having sensitivity in a different fluorescence emission wavelength band.   The detector includes one light receiving sensor and a filter that transmits only light in a plurality of predetermined different fluorescence emission wavelength bands among light incident on the light receiving sensor. The fluorescence detection device according to any one of the above. A light source emission control unit that switches between the plurality of light sources and repeats alternate lighting;
The detector includes a plurality of light receiving sensors each having sensitivity in a different fluorescence emission wavelength band,
The fluorescence detection device according to claim 2, wherein the authenticity determination unit determines the authenticity of the fluorescence printing unit based on a combination of presence / absence of detection of a plurality of different emission wavelengths obtained by the plurality of light receiving sensors. A light source emission control unit that switches between the plurality of light sources and repeats alternate lighting;
The detector includes one light receiving sensor, and a filter that transmits only light in a predetermined plurality of different fluorescence emission wavelength bands among light incident on the light receiving sensor,
3. The authenticity determination unit according to claim 2, wherein the authenticity determination unit determines the authenticity of the phosphor printing unit based on a combination of presence / absence of fluorescence detection with different timing obtained by the one light receiving sensor by alternately lighting the light sources. Fluorescence detection device. A light source emission control unit for simultaneously lighting the plurality of light sources;
The detector includes a plurality of light receiving sensors each having sensitivity in a different fluorescence emission wavelength band,
The fluorescence detection device according to claim 2, wherein the authenticity determination unit determines the authenticity of the phosphor printing unit based on a combination of presence / absence of detection of a plurality of different emission wavelengths obtained by the plurality of light receiving sensors. A light source emission control unit for simultaneously lighting the plurality of light sources;
The detector includes one light receiving sensor, and a filter that transmits only light in a predetermined plurality of different fluorescence emission wavelength bands among light incident on the light receiving sensor,
The fluorescence detection device according to claim 2, wherein the authenticity determination unit determines the authenticity of the phosphor printing unit in accordance with the presence / absence of fluorescence detection and an output level obtained from the one light receiving sensor. The detector includes a plurality of light receiving sensors each having sensitivity in a different fluorescence emission wavelength band,
The fluorescence detection device according to claim 3, wherein the authenticity determination unit determines the authenticity of the phosphor printing unit based on a combination of presence / absence of detection of a plurality of different emission wavelengths obtained by the plurality of light receiving sensors. The detector includes one light receiving sensor, and a filter that transmits only light in a predetermined plurality of different fluorescence emission wavelength bands among light incident on the light receiving sensor,
The fluorescence detection device according to claim 3, wherein the authenticity determination unit determines the authenticity of the phosphor printing unit according to the presence / absence and output level of fluorescence detection obtained from the one light receiving sensor. The illumination device includes a light source that emits light having a predetermined wavelength band, and a filter that transmits only a predetermined plurality of excitation lights having different excitation wavelengths among the emitted light emitted from the light source,
The detector includes a light receiving sensor, and a filter that transmits only light in a predetermined plurality of different fluorescence emission wavelength bands among light incident on the light receiving sensor,
All excitation emissions are subject to downconversion, and all excitation wavelengths λx and all emission wavelengths λm are for a certain wavelength λc.
λc> λx and λc <λm
In the case
The fluorescence detection device according to claim 1, wherein the filter of the illumination device is formed to transmit a wavelength band of λc or less, and the filter of the detector is formed to transmit a wavelength band of λc or more. . The detector includes a light receiving sensor, and a filter that transmits only light in a predetermined plurality of different fluorescence emission wavelength bands among light incident on the light receiving sensor,
Excitation emission is a mixture of down-conversion and up-conversion, and all excitation wavelengths λx are at specific wavelengths λc1 and λc2 (where λc1 <λc2).
λc1> λx or λc2 <λx
And all emission wavelengths λm
λc1 <λm <λc2
In the case
The fluorescence detection device according to claim 1, wherein the filter of the detector is formed to transmit a wavelength band of λc1 or more and λc2 or less. The illumination device includes: a light source that emits light having a predetermined wavelength band; and a filter that transmits only excitation light having a predetermined plurality of different excitation wavelengths among the emitted light emitted from the light source, The detector includes a light receiving sensor, and a filter that transmits only light in a predetermined plurality of different fluorescence emission wavelength bands among the light incident on the light receiving sensor,
All excitation emissions are subject to upconversion, and all excitation wavelengths λx and all emission wavelengths λm are at a certain wavelength λc.
λc <λx and λc> λm
In the case
The fluorescence detection device according to claim 1, wherein the filter of the illumination device is formed to transmit a wavelength band of λc or more, and the filter of the detector is formed to transmit a wavelength band of λc or less. . A fluorescence detection device that detects a phosphor printing unit that emits light at a plurality of wavelengths different from the excitation light with respect to a plurality of excitation lights of different wavelengths,
An illumination device that irradiates the phosphor printing unit with a plurality of excitation lights having different wavelengths for exciting the phosphor printing unit, and
A detector for detecting light emission in a plurality of wavelength bands emitted from the phosphor printing unit;
Using a color difference based on the light emission detected by the detector, a true / false determination unit that determines the authenticity of the phosphor printing unit;
A fluorescence detection device comprising:   The fluorescence detection apparatus according to claim 15, wherein the illumination device has a plurality of independent light sources for a plurality of different excitation wavelengths.   The illumination device includes one light source that emits light having a predetermined wavelength band, and a filter that transmits only excitation light having a plurality of different excitation wavelengths out of the emitted light emitted from the light source. The fluorescence detection device according to claim 15.   The fluorescence detection apparatus according to claim 16, further comprising a light source emission control unit that switches the plurality of light sources and repeats alternate lighting.   The fluorescence detection apparatus according to claim 16, further comprising a light source emission control unit that simultaneously turns on and off the plurality of light sources.   The fluorescence detection device according to any one of claims 15 to 19, wherein an allowable error value for determining authenticity using the color difference is variable as a parameter.   The fluorescence detection device according to claim 20, wherein the allowable error value is determined from a result obtained by sampling a predetermined number of detection media.

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