JPH07178372A - Luminophor detector and postal matter processing device - Google Patents

Abstract

PURPOSE:To provide a luminophor detector capable of previously detecting the degradation in detecting capacity to detect luminophor and permits better maintenance of the device and a postal matter processing device. CONSTITUTION:Sample postal matter is used as a reference of the postal matter M at the time of maintenance and inspection, etc., to be periodically executed. The light emitted from the luminophor applied on a stamp stuck to the sample postal matter by exciting the luminophor is received in a photoelectric conversion section 21 and is converted to an analog electric signal from a light signal which is amplified by an amplifier 22 and is converted to a digital signal by an A/D conversion section 24. The digital signal is processed in a processing section 25 to determine SN. A buzzer is sounded when the SN is smaller than a predetermined first level and is larger than a predetermined second level. The operation of the device is stopped when the SN is smaller than the second level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a luminous body detection device used as a stamp detection device for detecting a stamp attached to a mail piece, the surface of which is coated with a luminous body.
Also, the present invention relates to a postal matter processing device using this light emitter detection device.

[0002]

2. Description of the Related Art For example, as a postal matter processing device, an automatic postal-ordering and stamping device for postal items, which detects stamps attached to postal items, postmarks them, and aligns and collects postal items, has been put into practical use. ing. This kind of automatic aligning and stamping device supplies the postal items one by one from the supply unit, conveys them in the conveying path, and detects the stamps by the stamp detecting device, thereby aligning the directions in which the stamps are stuck, Next, in the seal part,
The stamp attached to the postal matter is postmarked based on the position information of the stamp detected by the detection result of the stamp detection device.

In such an automatic arrangement and stamping device,
As a stamp detection device for detecting stamps, in the case of a stamp whose surface is coated with a luminescent material such as a phosphor, a luminescent material detection device that receives light emitted from the luminescent material and detects the presence or absence of the stamp is used. Has been.

In such a light emitter detecting device, the excitation light source irradiates the stamp portion on the postal matter with ultraviolet rays. A luminescent material such as a fluorescent material or a phosphorescent material applied to the surface of a stamp is excited by ultraviolet rays and emits a weak visible light. This weak visible light is input to the photoelectric conversion unit, and in the photoelectric conversion unit, the optical signal input as visible light is converted into an electric signal (analog signal) and input to the amplifier.

In the amplifier, the inputted electric signal is amplified to a certain level and inputted to the comparator. In the comparator, the amplitude of the input output signal of the amplifier is simply compared with a preset reference value, and as a result, a binarized signal is output as the output of the light emitter detection device, and the imprint control unit. Sent to. The binary signal is for notifying information such as the presence or absence of a stamp or the position.

However, a sensitivity adjusting device is usually connected to the amplifier, and the sensitivity of the light emitter detecting device can be adjusted by changing the amplification degree of the amplifier from the sensitivity adjusting device. .

The sensitivity adjusting device is provided with a display for displaying the maximum output value (maximum value of the amplitude of the electric signal) of the electric signal output from the amplifier, and the operator can display the displayed maximum value. You can adjust the sensitivity while watching. Further, the sensitivity adjustment of a plurality of light emitter detection devices can be performed by one sensitivity adjustment device by switching with a switch provided in the sensitivity adjustment device.

The sensitivity adjustment is usually performed by using a standard sample mail piece at the time of regular maintenance and inspection. That is, the optical signal emitted from the light emitting body applied to the surface of the stamp attached to the sample mail is converted into an electric signal by the photoelectric conversion unit, and then amplified by the amplifier,
The maximum value of the amplitude of the amplified electric signal is displayed on the display provided in the sensitivity adjusting device, and is used as a guideline for sensitivity adjustment. The amplification level is adjusted so that the maximum amplitude of the electric signal displayed on this display is larger than the predetermined reference value so that the light emitter can be detected normally during actual operation. The sensitivity is adjusted.

When a stamp is detected using the above-mentioned luminous body detecting device, if the sensitivity of the luminous body detecting device becomes poor,
False detections will occur frequently. Here, the deterioration of the sensitivity means that the quality of the electric signal amplified and output by the amplifier is deteriorated, which makes it difficult to accurately detect the light emitter.

FIG. 5 is a graph for explaining the quality of an electric signal used for detecting the presence or absence of a light emitter (stamp).
3 is a diagram showing a specific example of a waveform of an electric signal output from an amplifier and a binarized signal as a result of processing the waveform by a comparator.

FIG. 5 (a) shows that when the sensitivity of the luminous body detection device is good, the light emitted from the luminous body coated on the surface of the stamp is detected by the photoelectric conversion section and photoelectrically converted. The resulting electrical signal is input to the amplifier and shows the waveform of the amplified electrical signal.

At this time, as shown in the waveform of FIG. 5 (a), the amplitude of the electric signal is small in the pattern portion 41a of the stamp 41 and large in the blank sheet portion 41b in the stamp manufacturing process. Since the pattern is printed after applying a luminescent material such as a fluorescent substance or a phosphor to the entire blank sheet before printing, the blank sheet portion 41 on which the design of the stamp 41 is not printed
A large amount of the luminous body is exposed at b, and the luminous intensity at the time of light emission becomes strong, and the luminous intensity at the time of light emission becomes weak because the luminous body is applied to the pattern portion 41a and the pattern is printed from above. This is because.

In FIG. 5A, the stamp detection area 40
The electric signal inside is composed of a signal component S and a noise component N. The signal component S is a portion between the electric signals corresponding to the blank sheet portion 41b (a portion showing a large amplitude in the drawing), and the stamp is detected here.
The noise component N is the portion of the other electric signal.

In FIG. 5B, an electric signal having a waveform as shown in FIG. 5A is input to the comparator, simply compared with a preset reference value 42, and output as the processing result. 2 shows a binarized signal. Then, as a result of the stamp detection by the light emitter detection device, the stamp is detected at the detection position 41c shown in FIG. 5B.

FIG. 6A shows the case where the light emission power of the light source (intensity of the irradiated ultraviolet rays) provided in the excitation section is lowered or the sensitivity of the photoelectric conversion section for detecting light is lowered. 6B shows the waveform of the electric signal output from the amplifier, and FIG. 6B shows the binarized signal output from the comparator. As described above, the pseudo signal or the like is detected at a position other than the position where the stamp 41 is actually attached, and an abnormality such as an erroneous detection occurs.

In FIG. 7 (a), because the light-shielding cover that blocks the incoming light from the outside is bent, the light-shielding state of the portion of the photoelectric conversion unit that detects weak light is poor, and the light from the outside enters. 7B shows the waveform of the electric signal output from the amplifier, and FIG. 7B shows the binarized signal output from the comparator, similar to the case shown in FIG. Abnormalities such as erroneous detection will occur.

The waveforms shown in FIGS. 6 (a) and 7 (a) are both stamp detection areas 40 as compared with the waveforms when a stamp is normally detected as shown in FIG. 5 (a). SN in
The ratio (signal-to-noise ratio) is small, and the quality of the electric signal is low, which is likely to cause erroneous detection. Here, since the SN ratio is obtained, for example, as the ratio of the area occupied by the signal component S to the area occupied by the noise component N, the area occupied by the noise component N in the electric signal in the stamp detection area 40 is large. That is why.

[0018]

As described above, even if the sensitivity is adjusted by simply increasing the amplification degree, the quality of the waveform having a low SN ratio due to the deterioration of the components or the like is not affected. However, there is a problem that the problem cannot be solved, but rather, increasing the amplification degree causes more and more false detections, lowers the detection accuracy, and lowers the processing capability of the apparatus.

Further, since there is no means for knowing such a waveform in which the SN ratio is lower than a certain reference value and it is difficult to detect the light-emitting body, it is operated as it is for a long time. Therefore, there is a problem in that the reliability of the processing capability of the device decreases.

Therefore, according to the present invention, due to deterioration of parts and the like,
It is an object of the present invention to provide a light emitter detection device and a mail processing device that can know in advance a decrease in detection capability for detecting a light emitter and can perform better maintenance.

[0021]

SUMMARY OF THE INVENTION A luminous body detecting apparatus of the present invention is a luminous body detecting apparatus for detecting a luminous body applied to an object to be detected, for exciting the luminous body to the object to be detected. A light source that emits excitation light, detects light emitted from a light-emitting body excited by the excitation light from this light source, photoelectric conversion means that converts into an electric signal, and the electric signal converted by this photoelectric conversion means Judgment means for judging the presence or absence of a light emitting body, calculation means for calculating the ratio of the signal component and the noise component of the electric signal converted by the photoelectric conversion means, and a predetermined value for which the calculation result of this calculation means is set in advance. And comparing means for outputting the comparison result.

Further, the luminous body detection device of the present invention is a luminous body detection device for detecting a luminous body applied to an object to be detected, wherein the object to be detected is irradiated with excitation light for exciting the luminous body. And a photoelectric conversion means for detecting light emitted from a light-emitting body excited by excitation light from the light source and converting the light into an electric signal, and the presence or absence of the light-emitting body from the electric signal converted by the photoelectric conversion means. Determination means for determining, a calculation means for calculating the ratio of the signal component and the noise component of the electric signal converted by the photoelectric conversion means, and the calculation result of this calculation means is compared with a preset reference value, When the calculation result is smaller than the reference value, a notification means is provided to notify that effect.

Further, the luminous body detection device of the present invention is a luminous body detection device for detecting a luminous body applied to an object to be detected, wherein the object to be detected is irradiated with excitation light for exciting the luminous body. And a photoelectric conversion means for detecting light emitted from a light-emitting body excited by excitation light from the light source and converting the light into an electric signal, and the presence or absence of the light-emitting body from the electric signal converted by the photoelectric conversion means. Determination means, a calculation means for calculating the ratio of the signal component and the noise component of the electric signal converted by the photoelectric conversion means, and a calculation result of the calculation means for a first reference value and a preset reference value. A first notifying means for notifying the result when the calculation result is smaller than the first reference value and larger than the second reference value as compared with the second reference value; Calculation result of means The first compared with the reference value and the second reference value, when the calculation result is less than the second reference value, and a second informing means for informing to that effect.

Further, the mail processing apparatus of the present invention is a supply means for supplying the mails one by one, a conveying means for conveying the mails supplied by the supplying means, and a mail conveyed by the conveying means. A light source that irradiates the stamp attached to the object with excitation light for exciting the luminescent material attached to it,
A photoelectric conversion unit that detects light emitted from a light-emitting body excited by excitation light from this light source and converts the light into an electrical signal, and a determination that determines the presence or absence of the light-emitting body from the electrical signal converted by the photoelectric conversion unit Means, arithmetic means for computing the ratio of the signal component and the noise component of the electric signal converted by the photoelectric conversion means, and the arithmetic result of this arithmetic means is compared with a preset predetermined value, and the comparison result is A comparing means for outputting, a stamping means for stamping a stamp on the postal matter transported by the transporting means based on the determination result of the determining means, and a stacking means for accumulating the postal matters stamped by the stamping means. It has and.

[0025]

The deterioration of the electric signal can be detected by calculating the ratio of the signal component and the noise component of the electric signal obtained by photoelectrically converting the light from the light emitting body, which is obtained from the photoelectric conversion means.
It is possible to know in advance the decrease in the detection ability for detecting the illuminant.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an automatic arrangement and stamping device as a mail processing device according to this embodiment. This automatic arranging and stamping device detects stamps affixed to postal items, performs postmarking, and aligns them in the same direction. That is, the postal matter M supplied from the postal matter supply unit 1 one by one is conveyed through the conveyance path 2 and is first sent to the two light emitter detection devices 4 and 5 forming the first detection unit 3.

The luminous body detection device 4 is provided below the conveying path 2 and detects the presence or absence of a luminous body by optically scanning one end of the lower surface of the mailed article M to be conveyed, and the luminous body detection device 4 is detected. Reference numeral 5 is provided on the upper side of the conveyance path 2 and detects the presence or absence of a light emitter by optically scanning one end of the upper surface of the conveyed mail M.

The mail M for which the luminous body (stamp) has been detected by the first detection section 3 goes straight on the conveyance path 2 as it is, and when the luminous body (stamp) has not been detected, the reversal section 6 It is inverted and sent to the light emitter detection devices 8 and 9 that form the second detection unit 7.

The luminous body detection device 8 is provided below the conveying path 2 and detects the presence or absence of a luminous body by optically scanning the other end of the lower surface of the mail M to be conveyed. The reference numeral 9 indicates a postal matter M that is provided above the conveyance path 2 and is conveyed.
The presence or absence of a light emitter is detected by optically scanning the other end of the upper surface of the.

When the stamp is normally detected in this way, the stamp is detected by either of the first and second detectors 3 and 7, and the light emitted by the stamp is detected. A stamp detection signal is sent from the body detection device to a stamp control unit (not shown), and the stamp control unit detects the position of the stamp.

Then, the postal matter M in which the position of the stamp is detected
Means that the stamps are all aligned in the same direction, and the stamper 10 stamps the stamps based on the stamp position information detected by the stamp controller, and the stacker 1
Integrated in 1.

A sensitivity adjusting device 13 is connected to the light emitter detecting devices 4, 5, 8 and 9 via a control line 12.
The sensitivity adjusting device 13 is installed in the immediate vicinity of the operator, and adjusts the sensitivity of the light-emitter detecting devices 4, 5, 8 and 9 at the time of regular maintenance and inspection.
It should be noted that the sensitivity adjustment of a plurality of light emitter detection devices can be performed by one sensitivity adjustment device 13 by switching with a switch.

FIG. 2 schematically shows the internal structure of the light emitter detection devices 4, 5, 8, 9 of the automatic mail sorting and stamping device shown in FIG. Here, since the light emitter detection devices 4, 5, 8, and 9 are all the same, the light emitter detection device 4 will be described as a representative. The same parts as those in FIG. 1 are designated by the same reference numerals.

The postal matter M conveyed to the light emitter detecting device 4 through the conveying path 2 is first excited by the excitation light source 2 such as an ultraviolet lamp.
UV light is emitted by 0. The surface of the stamp on the postal matter M is coated with a luminescent material such as a fluorescent material or a phosphorescent material. The luminescent material is excited by receiving ultraviolet rays and emits weak visible light.

The photoelectric conversion unit 21 receives visible light emitted from the light emitting body, converts the optical signal into an analog electric signal (referred to as photoelectric conversion), and sends it to the amplifier 22. In the amplifier 22, the analog electric signal sent from the photoelectric conversion unit 21 is amplified by a preset amplification degree, and its output is sent to the determination unit 23. The electric signal output from the amplification degree 22 is the same as that shown in FIG. Incidentally, the amplification degree is set to an appropriate value at the time of maintenance and inspection (at the time of maintenance) of this apparatus which is regularly performed. (Hereinafter, it may be referred to as sensitivity adjustment.) In the determination unit 23, first, the A / D conversion unit 24 converts an analog electric signal into a digital signal. That is, FIG.
The analog electric signal output from the amplifier 22 as shown in (a) is sampled in the A / D converter 24,
It is converted into a digital signal by operations such as quantization and coding.

In the processing section 25, during normal operation,
Image data processing is performed from the digital signal converted by the A / D converter 24 by a digital signal processing circuit and a CPU to detect the presence or absence of a stamp, generate a stamp detection signal, and apply a stamp (not shown). Send to control unit. In addition, the maximum output value of the electric signal output from the amplifier 22 (see FIG.
The maximum value of the signal amplitude of the analog electric signal output from the amplifier 22 as shown in (a). ) Is sent to the sensitivity adjusting device 13. Further, in the case of regular maintenance and inspection, a standard sample mail piece is used as the mail piece M, and the illuminant applied to the stamp attached to this sample mail piece by the excitation light source 20. Is emitted, and the light emitted from the light-emitting body is received by the photoelectric conversion unit 21, converted from an optical signal into an analog electric signal, amplified by the amplifier 22, and converted into a digital signal by the A / D conversion unit 24. . From the signal converted into this digital signal, the processing unit 2
The SN ratio is calculated by the digital signal processing circuit 5 and the CPU. When the obtained SN ratio is smaller than a predetermined first level and is larger than a predetermined second level, a first alarm signal is output to notify by an alarm such as sounding a buzzer. I do. When the SN ratio is smaller than the second level, a second alarm signal is output to stop the device, etc. to notify by an alarm.

Reference numeral 30 is a light-shielding cover, which is provided on the conveying path 2 facing the present apparatus and blocks incoming light from the outside. Here, with reference to FIG. 3, an example of a method of calculating the SN ratio performed by the processing unit 25 will be described. The waveform of the electric signal shown in FIG. 3 is that of the electric signal output from the amplifier 22. That is,
If the sensitivity of the illuminant detection device is good, first, mail M
In the area including the detection area 40 of
The light emitted from the light-emitting body applied to the surface of the stamp 40 by being irradiated with ultraviolet rays is photoelectrically converted by the photoelectric conversion unit 21, and the electric signal resulting from this photoelectric conversion is input to the amplifier 22 and amplified, whereby the amplifier 22 It was output from. S
The N ratio is calculated in the detection area 40 of this waveform.

An analog signal as shown in FIG.
The conversion unit 24 samples, quantizes, and encodes the signal into a digital signal by using, for example, a dedicated signal processing circuit that is made into an LSI. In this process, the analog signal is sampled at a speed considerably larger than its frequency, and the sampling interval at this time is the pulse width, and the area of the rectangular pulse whose signal amplitude value obtained by sampling is the height is By adding up the detection area 40 with each of the signal component S and the noise component N,
The area Ss occupied by the signal component S and the area Ns occupied by the noise component N are obtained. The ratio of the area occupied by the signal component Ss to the area Ns occupied by the noise component N (S
s / Ns) Obtained and used as the SN ratio.

The sensitivity adjusting device 13 displays the maximum output value sent from the processing section 25 on the display 26, is connected to the amplifier 22 via the control line 12, and is regularly maintained. The degree of amplification of the amplifier 22 can be adjusted on the basis of the maximum output value displayed on the display device 26 at the time of inspection or as needed.

Next, the operation of the automatic arranging and stamping device will be described with reference to the flowchart shown in FIG. First, the process proceeds to step S1, and in the case of normal operation, the process proceeds to step S2.

In step S2, the postal matter M is supplied from the postal matter supply unit 1 one by one and is conveyed through the conveyance path 2 to obtain the first matter.
Of the two light-emitter detection devices 4 and 5 constituting the detection unit 3 of
Sent to. First, the mail M is sent to the light emitter detection device 4, and the process proceeds to step S3.

In step S3, when the stamp attached to the postal matter M is irradiated with ultraviolet rays from the excitation light source 20, the luminous body coated on the surface of the stamp is excited and emits light. Proceed to.

In step S4, the light emitted from the light emitting body is input to the photoelectric conversion unit 21 and converted into an electric signal,
Go to step S5. In step S5, step S4
The electric signal (analog signal) converted by
Is input to, and is amplified with a preset amplification degree, and the process proceeds to step S6.

In step S6, the electric signal amplified in step S5 is sent to the A / D converter 24 for sampling,
It is converted into a digital signal by operations such as quantization and coding, and the process proceeds to step S7.

In step S7, the digital signal converted in step S6 is sent to the processing unit 25, image data processing is performed by the digital signal processing circuit and the CPU, the presence or absence of a stamp is detected, and the stamp is removed. When detected, a stamp detection signal is generated and output to the stamp control unit. Further, the maximum output value of the electric signal output from the amplifier 22 is obtained, sent to the sensitivity adjusting device 13, and displayed on the display 26. Also in the light emitter detection device 5, the above steps S3 to S are performed.
The same processing as in 7 is performed, and the process proceeds to step S8.

In step S8, as a result of the processes of steps S3 to S7 being executed by the light emitter detection device 4 and the light emitter detection device 5, the light emitter (stamp) is attached to one end of the lower surface or the upper surface of the mail M. Is detected, and if a light-emitting body is detected, go straight on the conveyance path 2 as it is, and proceed to step S9.

In step S9, the imprinting section 10
Based on the stamp detection signal output from any of the four light emitter detection devices 4, 5, 8 and 9, the stamp position is detected based on the stamp position information detected by the stamp control unit, and the postmark is stamped on the stamp portion.
In step S10, the postal matter M is accumulated in the accumulating unit 11 in the same direction.

On the other hand, when no luminous body is detected in step S8, the postal matter M is reversed by the reversing unit 6 and sent to the luminous body detecting devices 8 and 9 constituting the second detecting unit 7. . First, the postal matter is sent to the light emitter detection device 8, the process returns to step S3, and thereafter, the same process as above is performed until step S7. Then, the light-emitting body detection device 9 also performs the same processing as steps S3 to S7 described above, and proceeds to step S8.

In step S8, as a result of the processes of steps S3 to S7 being executed by the luminous body detection device 8 and the luminous body detection device 9, the luminous body (postage stamp) is attached to the other end of the lower surface or the upper surface of the mail M. ) Is detected, and if a light-emitting body is detected, go straight on the conveyance path 2 as it is, proceed to step S9, and so on.
If the postal matter M is attached with a stamp coated with a light-emitting body, then one of the first detection unit 3 and the second detection unit 7
The stamp is always detected in either one, but if it is not detected in either, the process proceeds directly to step S10 without passing through step S9, and the postal matter in which the stamp is not detected in the stacking unit 11 is stacked. It will be collected there.

Next, in the step S1, if the periodical maintenance inspection of the light emitter detection device is performed, the step S11 is performed.
Proceed to. In step S11, a reference sample mail piece is conveyed as the mail piece M in the conveyance path 2, is first sent to the light emitter detection device 4, and proceeds to step S12. For the sample mail piece, the same as step S3. Processing is performed, and the process proceeds to step S13.

In step S13, the same processing as step S4 is performed, and the process proceeds to step S14, and step S14
Then, the same processing as step S5 is performed, and step S1
5, the process similar to step S6 is performed in step S15, and the process proceeds to step S16.

In step S16, the digital signal converted in step S15 is subjected to digital signal processing by the digital signal processing circuit of the processing section 25 and the CPU to calculate the SN ratio, and the maximum output value is calculated. It is displayed on the display 26 of the sensitivity adjusting device 13, and step S17
Proceed to.

In step S17, when the SN ratio obtained in step S16 is smaller than the first level but larger than the second level, the first alarm signal is output to sound the buzzer. , Warns maintenance personnel on the spot that the processing capacity of the equipment has deteriorated. In addition, the SN ratio obtained in step S16 is the second
When the level is lower than the level, the second alarm signal is output to stop the device and allow the maintenance worker to perform the parts replacement work.

Similarly to the case of the light emitter detecting device 4, in the light emitter detecting devices 5, 8 and 9, the sample mail is sent to each light emitter detecting device, and the steps S11 to S17 described above are performed.
Maintenance inspection can be performed by performing the process of.

As described above, according to the above-described embodiment, a standard sample mail piece is used as the mail piece M at the time of periodic maintenance and inspection, and the sample mail piece is attached to this sample mail piece. Exciting the luminous body applied to the stamp, receiving the light emitted from the luminous body, converting the optical signal into an analog electric signal, digital signal processing is performed to obtain the SN ratio, and the SN ratio is When the level is lower than the first level but higher than the second level, an alarm such as sounding a buzzer is issued, and the SN ratio is the second level.
When it is lower than the level of 1, the deterioration of the detection capability for detecting the light emitter can be known in advance by notifying the device by stopping the device or the like, and better maintenance becomes possible.

[0056]

As described above, according to the present invention, it is possible to know in advance the decrease in the detection capability for detecting a light emitter, and to improve the maintenance of the light emitter detection device and postal matter processing. A device can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram schematically showing an automatic arrangement and stamping device as a mail processing device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram schematically showing a light emitter detection device according to an embodiment of the present invention.

FIG. 3 is a diagram for explaining a method of calculating an SN ratio.

FIG. 4 is a flowchart for explaining the operation of the automatic assembling and imprinting device.

FIG. 5 is a diagram for explaining the quality of an electric signal for detecting a light emitter.

FIG. 6 is a diagram for explaining the quality of an electric signal for detecting a light emitter.

FIG. 7 is a diagram for explaining the quality of an electric signal for detecting a light emitter.

[Explanation of symbols]

M: Mail, 4, 5, 7, 8 ... Light emitter detection device, 10 ...
Imprinting part, 13 ... Sensitivity adjusting device, 20 ... Excitation light source, 21 ...
Photoelectric conversion part, 22 ... Amplifier, 23 ... Judgment part, 24 ... A /
D conversion unit, 25 ... Processing unit, 26 ... Display device.

Claims (4)

[Claims] 1. A light emitter detection device for detecting a light emitter applied to an object to be detected, comprising: a light source for irradiating the object to be detected with excitation light for exciting the light emitter; and excitation from the light source. A photoelectric conversion unit that detects light emitted from a light-emitting body excited by light and converts the light into an electrical signal, a determination unit that determines the presence or absence of the light-emitting body from the electrical signal converted by the photoelectric conversion unit, and the photoelectric conversion unit. Arithmetic means for computing the ratio of the signal component and the noise component of the electric signal converted by the converting means, and a comparing means for comparing the arithmetic result of this arithmetic means with a preset predetermined value and outputting the comparison result. An illuminant detection device comprising: 2. A light emitter detection apparatus for detecting a light emitter applied to a detection target, comprising: a light source for irradiating the detection target with excitation light for exciting the light emitter; and excitation from the light source. A photoelectric conversion unit that detects light emitted from a light-emitting body excited by light and converts the light into an electrical signal, a determination unit that determines the presence or absence of the light-emitting body from the electrical signal converted by the photoelectric conversion unit, and the photoelectric conversion unit. Computation means for computing the ratio of the signal component of the electrical signal converted by the conversion means and the noise component, and the computation result of this computation means is compared with a preset reference value, and the computation result is higher than the reference value. A light-emitter detection device comprising: a notification unit that notifies the user when it is small. 3. A light-emitter detection device for detecting a light-emitter applied to an object to be detected, comprising a light source for irradiating the object to be detected with excitation light for exciting the light-emitter, and excitation from the light source. A photoelectric conversion unit that detects light emitted from a light-emitting body excited by light and converts the light into an electrical signal, a determination unit that determines the presence or absence of the light-emitting body from the electrical signal converted by the photoelectric conversion unit, and the photoelectric conversion unit. Calculating means for calculating the ratio of the signal component and the noise component of the electric signal converted by the converting means, and comparing the calculation result of this calculating means with a preset first reference value and second reference value, When the calculation result is smaller than the first reference value and larger than the second reference value, a first notifying unit for notifying that effect is provided; Reference value and the above A light emitting device detection apparatus comprising: a second notification unit that compares the calculation result with a second reference value and, when the calculation result is smaller than the second reference value, notifies that effect. 4. A feeding means for feeding the postal matter one by one, a conveying means for conveying the postal matter supplied by the feeding means, and a stamp attached on the postal matter conveyed by the conveying means. A light source that emits excitation light for exciting the light-emitter provided to the light source, and photoelectric conversion means that detects light emitted from the light-emitter excited by the excitation light from the light source and converts the light into an electric signal, Determination means for determining the presence or absence of the light-emitting body from the electric signal converted by the photoelectric conversion means; calculation means for calculating the ratio between the signal component and the noise component of the electric signal converted by the photoelectric conversion means; A comparison means for comparing the calculation result of the calculation means with a predetermined value and outputting the comparison result, and for the stamp on the postal matter conveyed by the conveying means based on the judgment result of the judging means. Push A seal means for, mail processing apparatus being characterized in that anda stacking means for stacking mailpieces that have been stamped in the stamping unit.