WO2004080494A1

WO2004080494A1 - Optical sterilizing method and device using flash pulses

Info

Publication number: WO2004080494A1
Application number: PCT/JP2004/003283
Authority: WO
Inventors: Yoichi Fujii; Yasuhiro Kotani; Junichi Jo; Yesato Sato
Original assignee: Nihon University
Priority date: 2003-03-14
Filing date: 2004-03-12
Publication date: 2004-09-23
Also published as: JP2004275335A

Abstract

A device using flash pulses, which is small-sized, produces no heat radiation, and is energy-saving. An optical sterilizing device using flash pulses adapted to irradiate a sterilization subject with flash pulses to sterilize the sterilization subject, wherein the device comprises a blue color light emitting diode array (3) opposed to a sterilization subject with a predetermined distance therebetween, and a driving circuit (5) for driving this blue color light emitting diode array (3) by pulse signals spaced at predetermined intervals. This blue color light emitting diode array (3) irradiates the sterilization subject (S) with near ultraviolet rays to effect sterilization.

Description

Light sterilization method and device using flash pulse

TECHNICAL FIELD The present invention relates to a flash for sterilizing an object to be sterilized by irradiating a flash pulse to the object to be sterilized.

The present invention relates to a photosterilization method using light pulses and an apparatus therefor. book

Background technology At present, due to the frequent occurrence of food poisoning by microorganisms, the introduction of HACCP (Hazard Analysys Control Point evaluation) has become widespread worldwide, and non-heating and non-contact have replaced the mainstream heat sterilization and drug-based sterilization. There is a growing demand for sterilizable technologies. FIG. 10 is a block diagram showing a conventional light sterilization apparatus using a flash pulse which can be sterilized without heating and without contact. In FIG. 10, the conventional light sterilizing device 101 using a flash pulse is separated from a strobe device 103 that can irradiate a flash pulse sterilization target with the strobe device 103 by a distance D. Transport means 105 for transporting the sterilized object S disposed to a sterilizing place below the strobe device 103 and transporting the sterilized object S to another location after completion of sterilization (for example, , Patent Document 1). Here, the tropo device 103 is composed of a strobe 13 and a drive circuit 13 3 for driving the strobe 13. The strobe light 13 1 is provided at the center of the reflector 13 1 a with a discharge tube 13 such as a xenon lamp. 1b is provided, and a glass plate 1311c is provided in front of the reflector 13a. The drive circuit 133 includes a charge / discharge circuit 133a for directly driving the discharge tube 133b, a power supply circuit 133b for supplying power to the charge / discharge circuit 133a, and a flash. The control circuit 13 c controls the number of times, irradiation time, light emission timing and the like.

The transport means 105 is driven by a drive unit 151 based on a timing signal from a control circuit 133 c, and continuously transports the sterilization target S immediately below the strobolite 13 1 Device.

According to the photosterilization method using the flash pulse by the flash pulse using the flash pulse device 101, the flash time is in the range of 1/500 [second] to 1Z1700 [second]. By keeping the wavelength of the light emitted from the tube 13 1 b within the range of 250 [nm] to 1100 [nm] and irradiating a flash pulse to the sterilization target S, the sterilization target S is obtained. Non-heating · Non-contact sterilization. As a result, the bacteria to be sterilized absorb the pulsed light and rise in temperature to die, and since the sterilized material has a large heat capacity, the absorbed heat is dissipated and the composition of the sterilized object is deformed. There is no advantage.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2000-10072

However, according to the conventional photosterilizer using a flash pulse described above, there are disadvantages that the device becomes large, heat radiation is large, and energy consumption is large. Disclosure of the invention

The present invention solves the above-mentioned drawbacks, enables miniaturization, does not emit heat, It is another object of the present invention to provide an energy-saving light sterilization method using a flash pulse and an apparatus therefor.

To achieve the above object, a light sterilization method using a flash pulse according to the invention according to claim 1 is a light sterilization method using a flash pulse, which irradiates a flash pulse to an object to be sterilized to sterilize the object to be sterilized. A blue light-emitting diode array is driven by a pulse signal under predetermined conditions, and a flash pulse is generated from the blue light-emitting diode array and irradiated to an object to be sterilized for sterilization.

In order to achieve the above object, a light sterilization device using a flash pulse according to the invention according to claim 2 is a light sterilization device using a flash pulse that irradiates a flash pulse to a sterilization target to sterilize the sterilization target. And a driving circuit for driving the blue light emitting diode array with pulse signals at predetermined intervals. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing an apparatus for realizing a light sterilization method using a flash pulse according to an embodiment and an example of the present invention.

FIG. 2 is a side view showing a configuration example of a blue light emitting diode array used in an apparatus for realizing a method of sterilizing light by a flash pulse according to an embodiment and an example of the present invention.

FIG. 3 is a configuration example of a blue light emitting diode array used in an apparatus for realizing a light sterilization method using a flash pulse according to an embodiment and an example of the present invention. FIG.

FIG. 4 is a circuit diagram showing a circuit configuration of a blue light emitting diode array used in an apparatus for realizing a light sterilization method using a flash pulse according to an embodiment and an example of the present invention.

FIG. 5 is a diagram showing an example of a test device performed in the same manner as other light sources to verify the effectiveness of the light sterilization method using the light sterilization device using a flash pulse according to the embodiment and the example of the present invention. It is.

FIG. 6 is a characteristic diagram showing a spectrum of another light source (“GL_6”) measured by a light intensity measuring instrument.

Fig. 7 shows other light sources ("OC 90 Aj" and "M

FIG. 9 is a characteristic diagram showing a spectrum of S 90 AJ).

FIG. 8 is a characteristic diagram showing the spectrum of another light source (“white LEDJ”) measured by the light intensity measuring instrument.

FIG. 9 is a characteristic diagram showing a spectrum of a light source (“blue LEDJ”) of a photosterilizer using a flash pulse according to the present invention, measured by a light intensity measuring device.

FIG. 10 is a block diagram showing a conventional light sterilizer using a flash pulse which can be sterilized without heating and without contact. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments and examples of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an apparatus for realizing a light sterilization method using a flash pulse according to an embodiment and an example of the present invention.

In FIG. 1, the light sterilizer 1 using a flash pulse kills the flash pulse. A light-sterilizing device using a flash pulse for irradiating a germ object to sterilize the germ object; a blue light-emitting diode array 3 facing the germ object S at a predetermined distance; and the blue light-emitting diode array. And a driving circuit 5 for driving 3 with a pulse signal at a predetermined interval.

FIG. 2 is a side view showing a configuration example of a blue light emitting diode array used in an apparatus for realizing a photodisinfection method using a flash pulse according to an embodiment and an example of the present invention. FIG. 3 is a plan view showing a configuration example of a blue light emitting diode array used in an apparatus for realizing a photosterilization method using a flash pulse according to an embodiment and an example of the present invention. FIG. 4 is a circuit diagram showing a circuit configuration of a blue light emitting diode array used in an apparatus for realizing a photosterilization method using a flash pulse according to an embodiment and an example of the present invention.

As shown in FIGS. 2 and 3, the blue light emitting diode array 3 used in the photodisinfection device 1 using a flash pulse according to the embodiment of the present invention has, for example, 37 blue light emitting diodes 3 a,. It is arranged and fixed on a substrate 3b. As shown in FIG. 4, the nodes of the diodes 3a,... And the force nodes are connected in parallel. A drive pulse is supplied from the drive circuit 5 to each of the diodes 3 a,..., Anode and cathode. This drive pulse has a pulse width of 10 [ms], a duty ratio of 1/10, a voltage of 4.5 [[V], and a pulse forward current of 100 [mA] per blue light emitting diode. ] Is adopted.

In the light sterilization method using a flash pulse realized by the light sterilization apparatus 1 using such a flash pulse, a pulse signal of a predetermined condition is transmitted from the drive circuit 5 to the blue light-emitting diodes 3 a,. Anode and The light is supplied to the cathode to drive the blue light-emitting diode array 3, and the blue light-emitting diode array 3 generates a flash pulse and irradiates the target S for sterilization.

(Verification)

In order to confirm whether the sterilization method using the light sterilization device 1 using a flash pulse is effective, the bacteria to be tested were selected, and several light sources capable of generating a flash pulse were selected, and the sterilization state was checked. .

The test bacteria selected, using Bacillus subtilis (I AM 1 0 6 9 frozen spores 5. 6 X 1 0 -7 [pieces ./ _m l]. This fungus spores belonging to Gram-positive rod It is a spore-forming bacterium that forms and is a taxonomically close member of Bacillus subtilis and Bacillus natto, and Bacillus anthracis is also a kind of Bacillus subtilis, but the bacterium used here is harmless to the human body.

The most distinctive feature of this fungus is that the cells themselves proliferate during cell division, form spores that are generally stronger than the fungus itself, and can survive even in harsh environments. Since the spores are covered with a hard shell, they have high resistance to external factors such as heat and chemicals, and are reported not to die even in boiling water for 100 [° C] and 5 [minutes].

Generally, it is a highly safe bacterium, and is widely used as an indicator bacterium for heat sterilization. If spores resistant to any stress, such as Bacillus, can be killed, other bacteria (such as Escherichia coli) can be treated sufficiently for future applications.

<About the selected light source> In order to verify that the present invention is effective, a comparison is made between the sterilized state using other light sources. Hereinafter, the light source selected for comparison in the present invention will be described below.

(1) As one of the other light sources, a GL-6 type germicidal lamp manufactured by National (hereinafter referred to as "GL-6") was adopted.

(2) As one of the other light sources, a Zeno flasher lamp “OC9OA type” manufactured by Tozai Electric Industries Co., Ltd., with a light emission interval of 1 / 1.3 [second] (hereinafter referred to as roc90A) A Zenon flasher lamp “MS 9 OA type” with an emission interval of 1/7 [second] (hereinafter referred to as “MS 90 AJ”) was adopted.

(3) As one of the other light sources, Nichia

LED), "NSPW500 BS" (hereinafter referred to as "white LED"), and power consumption 9 [W].

Note that a blue light emitting diode (hereinafter, referred to as “blue LED”) of “LP_03B 36A-81” manufactured by Sanyo Electric Co., Ltd. was used as a light source for use in the photosterilizer using a flash pulse according to the present invention.

The principle of light sterilization>

The principle of sterilization varies depending on the sterilization method. In the present invention, sterilization is performed using light.

Ultraviolet light (200 [nm]-400 [nm]) is mainly used in photosterilization, and the wavelength with a high relative value of sterilization power is around 250 [nm]-260 [nm]. The absorbed ultraviolet light destroys the DNA genome (DNA) required for life support and transmission of genetic information, triggers a thymine timer, and covalently bonds two adjacent thymine molecules to prevent regeneration. And stop the activities of bacteria etc. and die Let it.

The mechanism of sterilization by light having a visible wavelength of 350 nm or more is considered to be an indirect effect involving molecules surrounding the cells, for example, oxygen and photosensitizing molecules. Also, apart from the photosynthetic bacteria Chlorella, light is not only unnecessary but rather harmful for many microorganisms.

The following two mechanisms are considered as the mechanism of flash pulse sterilization. The same effect as the UV sterilization mechanism described above can be considered. Even if there is a substance that absorbs ultraviolet light, such as the cell membrane of a bacterium, due to the instantaneous light emitted by a flash pulse, the light reaches deep into the bactericidal effect. It is thought that

On the other hand, by irradiating with visible light or infrared light, the light absorbed on the surface of the object to be sterilized is converted into heat, and the temperature rises, resulting in a sterilizing effect. Due to the very short irradiation time, a rapid temperature rise occurs instantaneously and only on the very surface of the object to be sterilized. It is thought that a high sterilization effect can be obtained by the effect of simultaneous occurrence of DNA damage by ultraviolet rays and rapid temperature rise by visible and infrared rays.

Next, the following characteristic tests were performed to confirm the effectiveness of the present invention. When using bacteria, it is impossible to confirm the bacteria with the naked eye. Also, the size of the bacteria is as small as 1 [im] to 100 [μιη], and it is difficult to confirm even with a normal optical microscope. Because it is not possible to determine whether the object is alive or dead, measurement was performed using a special method.

There are various methods for measuring the growth process of microorganisms. First, the total bacteria counting method is a method of directly counting the number of bacteria, such as bacteria and yeast, under a microscope, using a Petroff-Hauser bacterial counting plate and a Thoma hemocytometer.

Next, in spectroscopic methods, there is an absorption method using a nephelometer or a colorimeter. There are methods for measuring the optical absorbance of a medium containing bacterial cells using a photoelectric colorimeter and a laser method for measuring the concentration of microorganisms in the medium. In this laser method, when a semiconductor laser irradiates a suspension containing bacteria with 780 [nm] light, the light that attenuates is received by the light-receiving unit, converted to a voltage, and expressed as absorbance. Things. The light absorption is determined by counting the intensity of incident light, transmitted light, and scattered light.

In addition, the viable cell counting method is a method in which a bacterial solution is appropriately diluted to generate a knee so that only the viable cells are measured.

In order to verify the effectiveness of the present invention, in the present invention, the measurement was performed by employing the colony force method based on the viable cell counting method.

A colony is a colony of bacteria. One colony contains about 100 million bacteria. Since one bacterium repeats division and creates one lip, it is possible to measure the presence or absence of the bacterium and its number by forming a colony.

Next, the colony counting method will be specifically described.

Prepare an agar plate medium using Eiken Chemical's ordinary agar medium (agar with nutrients to promote the growth of bacteria) in the Petri dish, and close the Petri dish until the agar medium solidifies. ~ 30 [min] Leave to stand. At this time, appropriate nutrients and temperatures are required to culture the bacteria. Originally, culture medium purification After dissolving the drug in water and adjusting the pH, it is necessary to add 65% [%] of powdered agar and pasteurize it, but this time the normal agar medium used was sterilized and pH adjusted. It is something.

After the agar medium has solidified, slightly shift the lid in an electric water bath and aseptically dry the water droplets for 15 to 20 minutes.

In addition, apply on a sterile target (sample agar plate) diluted with platinum wire so that the formed colonies do not overlap. Before and after using platinum wire, be sure to sterilize the platinum wire with flame. At this time, the tip of the platinum wire with the cells is first placed in a low-temperature inner flame, and then burnt with a high-temperature outer flame. This is because if you suddenly enter the outer flame, there is a risk that the bacterial cells will scatter around.

As described above, for at least four sterilization targets (sample agar plates) in which colonies have occurred, a light sterilization method using a flash pulse by the light sterilization device 1 using a flash pulse according to the embodiment of the present invention; Each of the three other light sources is subjected to photosterilization by the photosterilization method including a flash pulse. The object to be sterilized (sample agar plate) sterilized by the photosterilization method using the flash pulse by the flash pulse photosterilizer device 1 according to the embodiment of the present invention, and the flash by the other three light sources described above. The three sterilized objects (sample agar plates) sterilized by the light sterilization method including pulse are cultured in an electric thermostat at 37 [° C] for 24 hours. At this time, if the door is frequently opened and closed, the temperature will change, so care must be taken.

After 24 hours, count the number of colonies of each sterilization target (sample agar plate) removed from the electric thermostat. At this time, each sterilization target (sample agar plate) to be counted should have a colony number of about 30 to 300 [pieces] per petri dish. Is the most reliable and desirable.

Definition of bactericidal effect>

In order to examine the sterilization efficiency muddy, it is defined as follows. Let A be the number of bacteria generated without light irradiation, and P be the sterilization efficiency when the number of bacteria remaining after light irradiation is r.

P = {(A— r) / A} X 1 0 0… (1)

Is defined. .

However, A and 1- are performed several times, because colonies may overlap with each other in a single data, bacteria may be mixed in the air, or errors may occur due to differences in bacterial growth. The average value of the data was used.

Test equipment>

The following equipment was used to perform the above tests.

(1) An optical spectrum analyzer was used to measure the wavelength distribution.

(2) An optical power meter was used to measure the light intensity of CW light.

(3) A light intensity measuring device was used to measure the light intensity of the pulsed light.

FIG. 5 is a diagram showing an example of a test device performed in the same manner as other light sources to verify the effectiveness of the light sterilization method using the light sterilization device using a flash pulse according to the embodiments and examples of the present invention. It is.

In FIG. 3, reference numeral 11 denotes a light source, and the light source 11 is a light source by a light sterilizing apparatus using a flash pulse according to the embodiment and the example of the present invention, or three other light sources. Insert

Further, in FIG. 5 described above, the symbol S is a sterilization target (sample agar plate). Further, in FIG. 5 described above, reference numeral 13 denotes a light intensity measuring device, and the light intensity measuring device 13 includes a photodiode (PD) 13a for converting light into electricity, and an electric signal from the PD 13a. And a control unit 13c for controlling the peak hold circuit 13b. '

Each light source (the other four light sources (“GL-6”, “OC 90A”, “MS 90A”, “white LED” and “blue LED” used in the light sterilization method using a flash pulse according to the present invention)] 1 The light intensity of (1) naturally becomes weaker as the distance from the light source (11) increases, so in order to measure the sterilization efficiency based on the light intensity, measure the light intensity against the distance and grasp the values. Therefore, the measurement was performed using an optical power meter and an optical intensity measuring device 13.

Fig. 6 is a characteristic diagram showing the spectrum of another light source ("GL-6") measured by a light intensity measuring instrument. The horizontal axis represents the wavelength [nm], the vertical axis represents the intensity [dBm], Each one is taken.

FIG. 7 is a characteristic diagram showing the spectrum of another light source (“0 C 90 AJ” and “MS 90 AJ”) measured by a light intensity measuring instrument, in which the horizontal axis represents the wavelength [nm] and the vertical axis represents the wavelength [nm]. The axis shows the intensity [dBm].

FIG. 8 is a characteristic diagram showing the spectrum of another light source (“white LED”) measured by a light intensity measuring instrument, where the horizontal axis represents wavelength [nm] and the vertical axis represents intensity [dBm]. Is taken respectively.

FIG. 9 is a characteristic diagram showing a spectrum of a light source (“blue LED”) of a photosterilizer using a flash pulse according to the present invention, which is measured by a light intensity measuring device. The horizontal axis represents wavelength [nm], and the vertical axis represents wavelength. The axis shows the intensity [dBm]. Table 1 shows the results of these characteristic diagrams. Table 1 Spectrum wavelength range of each light source Peak wavelength.

(} Le 6 330nm〜 700nm 435nm

OC90A & MS90A 320nm〜 1150nra 845nm

White LED 330nm〜 800nra 468nm

Blue LED 419nm ~ 519nm 466nm

As can be seen from Table 1, “GL-6” had a wavelength of 330 [nm] to 700 [nm] and a peak wavelength of 435 [nm]. “OC 90 A” and “MS 90 A” had a wavelength of 320 nm to L 150 nm and a peak wavelength of 845 nm. “White L EDJ had a wavelength of 330 [nm] to 800 [nm] and a peak wavelength of 468 [nm].“ Blue LED ”used in the photodisinfection device 1 using a flash pulse according to the embodiment of the present invention. The wavelength was 419 [nm] to 519 [nm], and the peak wavelength was 466 [nmj].

距離 Light source distance Light intensity characteristics-

(The unit of light intensity is WZm. 2)

Gl-6 OC90A & MS90A White LED Blue LED

1cm 7.47 2.10 * 10 ^Λ -4 243.19 48.50

zcm .5.77 1.97 * 10 ^A -4 208.81 .45.30

icm 3.71 .1.88 * 10 ^A -4 179.53 42.90

4cm '3.03 1.81 * 10 ^Λ -4 129.87 40.70

Dcm 2.18 1.78 * 10 120.93 39.50

10cm 0.80 1,71 Police 4.35.65 20.50

15cm 0.58 1.68 * 10 ^A -4 14.00 11.60

20cm 0.31 1.63 * 10 12.73 7.30

Next, the measurement was performed while changing the distance between the light source 11 and the sterilization target (sample agar plate) S. Table 2 shows the other three light sources ("GL-6", "OC90A" and "MS90A", "white LED") and the light sterilizer using a flash pulse according to the embodiment of the present invention. It shows the relationship between the light source distance and the light intensity in a light source ("blue LED"). As shown in Table 2, "GL- 6" is, 1 [cm] at 7. 47 [w / m 2] , 2 [cm] at ^{5. 77 [w / m 2]} , ···, 20 The characteristic was 0.31 [w / m ² ] in [cm]. As shown in Table 2, “OC 90 A” and “MS 90 A” are 1.10 X 10.4 [w / m ² ] at 1 [cm] and 1.19 at 2 [cm]. ^{X 1 0. 4 [w / m} 2], ... 1. was 63 X 10-4 [wZm ^2] inヽ20 [cm]. As shown in Table 2, "white LEDJ is, 1 [cm] at ^{243. 1 9 [w / m 2} ] 2 [cm] 208. 81 [w / m 2] in, ■ ··, 20 [cm Was 12.73 [w / m ² ]. As shown in Table 2, the “blue LED” of the light source used in the photosterilizer using a flash pulse according to the present invention was 48.50 [w / m ² ] at 1 [cm] and 2 [c 111] at 1 [cm]. 45.30 light source used in optical sterilizer according [w / m ^2] ...ゝ20 [cm] at 7.30 flash pulses according to an embodiment of the present invention to a thickness in [w / m ^2]

(“Blue LEDJ”) and other light sources (“GL-6”, “OC90A” and “MS90A”, “White LEDJ”) are shown in Table 3. Table 3

, Characteristics of each light source

Light source GL-6 OC90A & MS90A

sterilization lamp ¾ flash lamp

Wawkngtli (Peak) 435nm 845nm

Characteristic from near UV to visible from near UV to near I

Light intensity (5cm) 2.18 W / m ^A 2 1.78 * 10 W / m ^A 2

(GL-6 1) 1 8.2 * 10 ^Λ -5

Waveiengli (Peak). '468nm' 466nm

Characteristic from near UV to visible almost near UV

Light intensity (5em) 120.93 W / m 8 2 39.50 W / m ^A 2

(GL-6 = 1) 55 18 In Table 3, the other light source “GL-6” has a peak wavelength (Wavelength (Peak)) of 435 [nm] and has a wavelength from near ultraviolet to visible light. The light intensity is 2.18 [w / m2] at a distance of 5 [cm]. In Table 3, the other light sources, “OC 90A” and “MS 90A”, have a peak wavelength (Wavelength (Peak)) of 845 [nm]. It has the property of having a wavelength up to the line and a light intensity of 8.2 X 10-4 [ _w / _m2 ] at a distance of 5 cm.

In Table 3, the other light source “white LED” has a peak wavelength (Wavelength (Peak)) of 468 [nm], has a wavelength from near ultraviolet to visible light, and has a light intensity of 5 [cm] away. 1 20.93 [wZm ² ].

In Table 3, the “blue LED” of the light source used in the photosterilizer using a flash pulse according to the present invention has a peak wavelength (Wavelength (Peak)) of 466 [nm], a wavelength of near-ultraviolet light, and a light intensity. Is 5 [cm] apart and 39.50 [w / m ² ].

By changing the distance between each light source 11 and the object to be sterilized (sample agar plate) S to 1 [cm], 3 [cm], 5 [cm], measurement of the sterilization efficiency at each light irradiation time with respect to the light intensity, In order to compare the results, the light intensity with respect to the distance from the light source 11 was measured.

Irradiation distance The results of the sterilization efficiency at the Z irradiation time are shown in Table 4 for the light source ("GL-6J" 11) and in Table 5 for the light source ("OC 90 AJ" 11). The light source ("MS 90A") Table 6 for 11 and Table 7 for the light source (“white LED”) 11, and Table 8 for the light source (“blue LED”) 11 Are shown below.

Table 4

Sterilization efficiency in G L-6 germicidal lamp

3cm

3 hours 10.00% 6.00% Table 8 Sterilization efficiency by blue LED lcm

1 hour 29.10%

2 hours 40.00%

3 hours 33.30% Regarding the light sterilization method using the light sterilization device using a flash pulse according to the embodiment of the present invention, as shown in Table 8, various bacteria in the air may be mixed or the bacteria may not grow well. The data has been reduced compared to the results of other light sources. Further, according to the test results, the light source (“blue LEDJ”) used in the light sterilization method using a flash pulse according to the embodiment of the present invention was also replaced with another light source (“GL_6”, roc 90 AJ and “MS 90 A”, “ For both white LEDJ), sterilization efficiency was observed. Power Sterilization target (sample agar plate) Did not reach the eradication of bacteria in S. First, considering the results shown in Tables 4 to 8, A bactericidal effect and suppression of bacterial growth were observed, but did not reach the eradication of the fungus.Tables 4, 5, and 6 show that flash lamps (OC 90 AJ and MS 90 AJ) and germicidal lamps Comparing the dynamic conditions of “GL-6”, it can be seen that the flashlamp (“OC 90A” and “MS 90A”) has lower sterilization efficiency. From this result, it was confirmed that the higher the power was, the shorter the wavelength was, the higher the efficiency was. Looking at the results alone, the flash lamps (“OC 90 A” and “MS 90 AJ”) are less practical than the germicidal lamps (“GL-6”) because of their lower sterilization efficiency. Although it is considered that it is not suitable for lightning, the effect of suppressing the growth of bacteria was recognized in spite of the weakest wavelength and light intensity among other light sources, indicating the effectiveness of flash pulse sterilization And the possibility of development can be confirmed. In addition, if a pulsed light source stronger than the flash lamp (“OC 90A” and “MS 90A”) is used, it will be possible to reduce bacteria.

The results in Tables 4, 7 and 8 show that the light source (“blue LED”) used in the photosterilizer using a flash pulse according to the embodiment of the present invention and one of the other light sources (“white LEDJ”). ) Resulted in lower germicidal efficiency than the germicidal lamp (“GL_6”), one of the other light sources.

However, in the light source (“blue LED”) used in the flash pulse light sterilizer according to the embodiment of the present invention, although the data is small, it is possible to obtain almost the same sterilization efficiency as that of the germicidal lamp (“GL-6J”). Was completed.

This result shows that the light source (“white LEDJ”) and the light source (“blue LEDJ”) used in the photodisinfection device using a flash pulse according to the embodiment of the present invention have a certain wavelength in the near ultraviolet region. The light source ("blue LED") used in the photodisinfection device using a flash pulse according to the embodiment of the present invention has more near-ultraviolet wavelengths, so the disinfection efficiency seems to be higher. It is.

In light sterilization, light intensity is also an important factor, but the higher the wavelength of the ultraviolet region (near ultraviolet region) in the spectrum of the light source, the higher the sterilization effect tends to be obtained. It is thought that there is.

From the above, according to the photodisinfection device using a flash pulse according to the embodiment of the present invention in which a flash pulse and a blue LED are combined, higher efficiency, lower power consumption, and lower cost than a normal germicidal lamp. Has the advantage that it can be miniaturized In addition, it is possible to obtain a sterilizing device that does not affect the human body.

In the photosterilizer using a flash pulse according to the embodiment of the present invention, the photosterilizer 1 using a flash pulse is composed of a blue light-emitting diode array 3 and a drive circuit 5, and the object to be sterilized is simply obtained from the blue light-emitting diode array 3. Although the method of irradiating S with pulsed light was used, the present invention is not limited to this, and the following configuration may be employed.

First, in the first modified example, the blue light emitting diode array 3 may be enlarged, and light from the blue light emitting diode array 3 may be efficiently guided to the sterilization target S using a lens or a mirror.

As a second modification, the size of the blue light emitting diode array 3 may be increased, and the light to be emitted may be applied to the sterilization target S from the tip of the optical fiber using the optical fiber. .

As a third modified example, the object S to be sterilized may be surrounded by the blue light emitting diode array 3 and sterilized.

In addition, the light sterilizing apparatus 1 using a flash pulse according to the embodiment of the present invention is a disposable towel made of paper at a restaurant or a geriatric care center, sterilizing water, and a raw counter display such as a spar. Applicable to sterilization of objects. Further, the light sterilizing apparatus using a flash pulse according to the embodiment of the present invention can be applied to disinfection that does not require wetting with a disinfecting solution or the like for infection in hospitals.

Further, the light sterilizing apparatus using a flash pulse according to the embodiment of the present invention can be applied to sterilization in a washing basket in a washing machine, in a dishwasher, in washing water, and in a vacuum cleaner.

In addition, the light sterilization apparatus using a flash pulse according to the embodiment of the present invention can be refrigerated. It can be applied to sterilization of water and filters inside the refrigerator and in the water storage tank of the ice machine. In addition, the photosterilizer using a flash pulse according to the embodiment of the present invention can be applied to sterilization of an air conditioner filter.

Furthermore, by using an optical fiber in combination with the light sterilizing apparatus using a flash pulse according to the embodiment of the present invention, the present invention can be applied to sterilization of a narrow portion or a gap that is inaccessible.

In addition, the light sterilizer using a flash pulse according to the embodiment of the present invention can be applied to sterilization of a bathtub and the like, and can be downsized, so that it can be applied to a small household sterilizer and a portable sterilizer. Industrial applicability

As described above, according to the light sterilization method using a flash pulse of the present invention and the apparatus therefor, a blue light emitting diode array is driven by a predetermined pulse signal, and a flash pulse is generated from the blue light emitting diode array to sterilize the light. Since the target can be irradiated and sterilized, it has the advantages of high efficiency, low power consumption, low cost and downsizing, and sterilization without heat radiation and without affecting the human body. There is an advantage.

Claims

The scope of the claims

1. In a light sterilization method using a flash pulse for sterilizing an object to be sterilized by irradiating the object with a flash pulse, a blue light emitting diode array is driven by a predetermined pulse signal to generate a flash pulse from the blue light emitting diode array. A light sterilization method using a flash pulse, wherein the object is sterilized by irradiating the object.

2. In a light sterilization apparatus using a flash pulse for irradiating a sterilization target with a flash pulse to sterilize the sterilization target, a blue light-emitting diode array facing the sterilization target at a predetermined distance, and the blue light-emitting diode And a drive circuit for driving the array by pulse signals at predetermined intervals.