JPS58153150A - Detector for luminous material - Google Patents

Abstract

PURPOSE:To reliably detect a luminous material, by a method wherein light emitted from an object to be detected is converted into an electric signal, and light, corresponding to a specified color, of lights emitted from the object to be detected is converted into an electric signal. CONSTITUTION:A body 20 of the invention device is located in a position corresponding to a conveyance path 10, a detecting window 20a is formed in the body 20, and a mercury discharge lamp 21, serving an exciting light source, is situated in the body 20 corresponding to the detecting window 20a. In which case, light emitted from an object P to be detected such as mails is converted into an electric signal, and light, corresponding to a specified color, of lights emitted from the object P to be detected is converted into an electric signal, and this permits the reliable detection of a luminous material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a luminescent substance detection device for detecting luminescent substances such as fluorescent substances and phosphorescent substances.

[Technical background of the invention]

Conventionally, there is a device 40 shown in FIG. 1 as a luminescent substance detection device for kernel seeds. P is the object to be detected, such as mail, which is on the conveyance path 1.
Convey the upper part in the direction of the arrow shown in the figure. A main body 2 is disposed at a position corresponding to the conveyance path 1 . The main body 2 has a detection II za, and a mercury discharge lamp 1, which is an excitation light source, is provided in the main body z corresponding to the detection 12 island. This mercury discharge lamp 1 uses excitation light (ultraviolet light) with a wavelength of 2537A.
and excitation light (ultraviolet ml) having a wavelength of 5 ssoi, and these excitation lights pass through the detection 112a and are irradiated onto the transport path l. Therefore, each of the above-mentioned excitation lights is irradiated onto the mail P, and if a luminescent substance is present on the mail P, the luminescent substance is excited and emits light, and the light is transmitted to the detection 11ja and the optical The light passes through the filter 4 and is received by the photoelectric converter I. The photoelectric converter 5 outputs a signal with a level corresponding to the amount of received light, and this output signal level is determined by the amplifier circuit C.
After being amplified to an appropriate level, the signal is supplied to the comparator circuit 1. The comparator circuit R compares the output signal level of the amplifier circuit with the reference signal level supplied from the reference signal generator 11m, and outputs a logic 11' signal if the output signal level is greater than the reference signal level. . As a result, it is determined that a postage meter having a luminescent material is present on the mail P. In addition, 1b is a light plate, which is used for detection.
This is to prevent outside light from entering the interior.

[Problems with background technology]

By the way, in such a luminescent substance detection device, the object to be detected is a luminescent substance emitting light 77 in a state of 1 degree as shown in FIG. In this case, a high level 0 output signal can be obtained from the photoelectric converter 5 as shown in FIG.
When the object to be detected is an iI-shaped luminous mark, for example, a fare meter 8, as shown in FIG. 3(a), the photoelectric converter IO output signal level becomes small as shown in FIG. It was difficult.

Also, although this is not the case with mail, plain paper often contains fluorescent substances to make the paper appear whiter. Therefore, if the postal item PGζ in FIG. The output signal level a corresponding to the grasshopper ground is as shown in FIG. 2 (el).
is superimposed on the output signal level corresponding to stamp k. In this case, since the output signal level corresponding to stamp K is high, there is no problem in detection. However, Fig. 3 (
If the mail item P4 (1) contains a fluorescent light amplifying agent, the output signal of the photoelectric converter 1 will be as shown in FIG. 3 (cl), making detection almost impossible.

[Purpose of the invention]

This invention was made in view of the above circumstances,
The aim is to develop a highly reliable luminescent substance detection device that can reliably detect luminescent substances regardless of the shape of the luminescent substance and without being affected by the luminescence of grasshopper grounds. It is about providing.

[Emission@0III] This invention converts light emitted from an object to be detected into an electrical signal, converts light corresponding to a specific color out of the light emitted from the object to an electrical signal, and converts the light emitted from the object into an electrical signal. By determining the signal level, the above-mentioned signal level, and OII, the false field corresponding to the luminescent substance other than the luminescent substance to be detected on the object to be detected is removed, and the first In addition to detecting the luminescent substance, the removed signal is integrated, and the level of the integrated signal is determined to detect the luminescent substance of wL2.

[Embodiments of the invention]

Hereinafter, an example of a vagina according to the present invention will be described with reference to the drawings. In 1I41H, the mail P, which is the object to be detected, is conveyed on the conveyance path 1o in the direction of the arrow shown in the figure. A main body 21) of the apparatus of the present invention is disposed at a position corresponding to the conveyance path 10. This main body Za has a detection window 1.
A mercury discharge lamp 11, which is an excitation light source, is provided in the main body j0 corresponding to this detection lamp zO. This mercury discharge lamp 11 emits excitation light (ultraviolet rays) t of jE2537A and 3650A, respectively, appropriate waves corresponding to various luminescent substances. In this way, the excitation light emitted from the mercury discharge lamp jZ passes through the detection window 10a.
The light passes through and is irradiated onto the mail P on the transport path 10. If a luminescent substance is present on the mail P, the luminescent substance will be excited by the excitation light and emit light.

This light is split into two directions by the half mirror 11, guided to the photoelectric converter 24 via the optical filter 11, and guided to the photoelectric converter tg via the optical filter 2j. The optical filter 11 allows light of a wavelength corresponding to a normal luminescent color to pass through. The optical filter 25 passes light of a wavelength corresponding to the color of the mail PO paper lIO. The photoelectric converters 14 and 16 convert the received light into electrical signals with a level corresponding to the amount of light, and these output signals are supplied to the difference detection circuit 2# via amplifiers x, v, and xa, respectively. . This difference detection circuit 2# detects the level difference between the two supplied signals and outputs a signal at a level corresponding to the detection result. This output signal is supplied to the first comparator circuit 11 and also to the second comparator circuit 12 via the integrating circuit 30'.

The first comparison circuit 11 compares the output signal level of the difference detection circuit 2# and the reference signal O level supplied from the reference signal generation circuit 11.

The second comparison circuit 12 compares the output signal level of the integration circuit 10 and the level of the reference signal supplied from the reference signal generator @814.

The outputs of these comparison circuits 11 and 31 are output from the OR circuit 1C to the outside as luminescent substance detection signals. Note that 1-b is a light-shielding plate that prevents external light from entering the detection lII II a.

Next, operations in the above configuration will be explained.

Now, as shown in Figure 5 (ml), when a piece of mail P that has a luminescent mark, such as a toll meter Ilt, and has seven fluorescent brighteners on its paper surface is conveyed, the luminescent light on the mail piece P is conveyed. The substance is excited by the excitation light of the mercury discharge lamp 11.The light emitted from the mail P is received by the charging converter 14, and the signal shown in FIG. Also, out of the light emitted from the mail P, light with a wavelength corresponding to the color of the paper surface is received by the charging converter 2-, and the signal shown in FIG. 5 (@) is output from the photoelectric conversion @16. The charging converter 14 and 1610 output signals are each amplified by amplifiers sr and za and supplied to difference detection circuit 2#.Difference detection circuit 1# detects the level difference between the two supplied signals. , outputs the signal shown in FIG. 5(4) corresponding to the level difference. That is, from the signal in FIG. 5(b), I and I in tel in FIG. , a signal corresponding to the toll needle rat is collected.This signal is supplied to the first comparator circuit 11, is integrated by the integrating circuit 1m, and is supplied to the 20th comparator circuit J1. In this way, the 11110 comparison circuit j1
If the level of the signal corresponding to is higher than the reference signal level, a 1m"l" signal will naturally be output, but the signal from the toll meter 8 is at a very low level as shown in the figure, so the ratio IIR Unfortunately, the output of the circuit 11O becomes the "m'o" signal. At the same time, the signal corresponding to the charge needle is integrated by the integral path 1-, as shown in Figure 5 (-). The signal is at a high level.Therefore, the second comparison circuit 1
1 outputs the logic Jl Confucianism, which is output to the outside via the OR circuit 1g. Thereby, the presence of the luminous mark on the mail P can be exclusively determined.

In this way, the luminescent mark can be reliably detected regardless of the shape of the luminescent mark and without being affected by luminescence in the grasshopper ground other than the luminescent mark.

Note that the present invention is not limited to the above-mentioned embodiments, and can be applied to, for example, banknotes as the object to be detected, and various modifications can be made without changing the gist.

〔Effect of the invention〕

As described above, according to the present invention, luminescent substances can be detected reliably regardless of the shape of the luminescent substances and without being affected by the luminescence of grasshopper grounds. equipment can be provided.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional luminescent substance detection device, Fig. 2 b) s (b) * (cl and 3
(at e (bl @ (cl) is a diagram for explaining the operation of FIG. 1, FIG. 4 is an overall configuration diagram showing one embodiment of the present invention, and FIG. 5 (al @ (bl I
(cl @ (d) I (@1 is for explaining the *mso operation, (a) is a configuration diagram showing an example of the detected object, (bl = (e) * (d). ) indicates the output signal waveform of each part in the 4th rIA. P... Detected object (mail *>, 20... Main body, 21
...Excitation light source, 14...First photoelectric converter, 26...
・20th photoelectric converter, 1#...difference detection circuit, jO...
- Integrating circuit, 11...first comparison circuit, 11...second comparison circuit. Patent Attorney Takehiko Kojie Figure 1 h Figure 2 Figure 3

Claims (1)

[Claims] an excitation light source that irradiates excitation light onto the detected object being transported;
The charging converter receives the light emitted from the object to be detected by the excitation of the excitation light source and converts it into an electrical signal, and 41! ! a 20th photoelectric converter that receives light corresponding to the color of and converts it into an electrical signal; and a 20th photoelectric converter that detects the difference in the output signal level of these charging converters and outputs a signal of a level corresponding to the detection result. a detection circuit, a first comparison circuit that compares the output signal level of the difference detection circuit with a reference signal level, an integration path that integrates the output signal of the output circuit, and an output signal of the integration path. A luminescent substance detection device, comprising a second comparison circuit for comparing the level with a reference signal level, and in which the outputs of the first m and second comparison circuits are used as luminescent substance detection signals.