KR20230046502A - Sterilization device with light emitting waveguide - Google Patents

Abstract

A sterilization device of the present invention comprises: a waveguide disposed to face a sterilizing surface including at least one of the first surface and the second surface when a filter is provided to output a fluid to the second surface after inputting the fluid to the first surface; and a light source inputting the light in the UV band to the waveguide, wherein the waveguide may be formed to emit the light in the UV band toward the sterilizing surface.

Description

Sterilization device with light emitting waveguide

The present invention relates to an apparatus for performing sterilization using a waveguide.

In general, when a vehicle air conditioner is operated in summer, air with high humidity outside passes through a vehicle air conditioner filter through an intake fan. At this time, while air with high humidity passes through the air conditioner filter, water molecules remain in the filter. Moisture or water molecules left in the filter provide a breeding ground for various bacteria and viruses, including mold.

A vehicle air conditioner filter only filters foreign substances in the outside air, but it is difficult to sterilize bacteria or mold itself, so it is difficult to sterilize viruses and prevent the occurrence of indoor odors.

Korean Patent Registration No. 2240487 discloses a technique for sterilizing through a germicidal lamp unit disposed in a net shape on the air input side or discharge side of the filter unit.

Korean Registered Patent Publication No. 2240487

An object of the present invention is to provide a sterilization device that continuously sterilizes a filter and does not obstruct the flow of fluid passing through the filter as much as possible.

In the sterilization device of the present invention, when a filter through which fluid is input to the first surface and then output to the second surface is provided, a waveguide disposed to face the sterilization surface including at least one of the first surface and the second surface. ; A light source for inputting light in the UV band to the waveguide, and the waveguide may be configured to radiate the light in the UV band toward the sterilization surface.

The sterilization device of the present invention includes a waveguide for radiating light in the UV band toward one side of a filter installed in a flow path through which fluid flows, and the waveguide receives the light in the UV band from a light source installed at a position away from the flow path. , The waveguide may be formed thinner than the thickness of the light source to less disturb the flow of the flow path compared to when the light source is disposed in the flow path.

In the case of air conditioning and heating and cooling systems such as air conditioners, viruses and molds can be created or amplified and spread.

Bacterial and mold levels in indoor air are one of the indicators of a healthy indoor environment. In this regard, bacteria and mold can be sterilized through a sterilization device that irradiates UV (Ultraviolet Ray, ultraviolet) light, and biological contaminants found in air conditioner evaporators and drain fans can also be significantly reduced.

According to the sterilization device of the present invention, a waveguide may be disposed instead of a light source at a position facing a filter that is a sterilization target.

Through this, various problems that occur when the light source is directly disposed in a passage through which a fluid such as gas flows can be prevented.

In order to sterilize the filter by directly installing the light source in the passage, a plurality of light sources need to be provided to uniformly irradiate the entire one surface of the filter.

In this case, since various electrical equipment for supplying electricity to a plurality of light sources disposed in the passage must also be disposed in the passage, installation and maintenance may be difficult.

In addition, heat generated from the light source may directly affect the fluid flowing along the flow path and the filter. The heat of the light source can be helpful for the growth of various bacteria.

In addition, a plurality of light sources formed in the passage may obstruct the flow of fluid.

In order to solve these problems, it is necessary to exclude a light source disposed in the passage. In order to solve various problems, the sterilization device of the present invention excludes a light source disposed in the flow path, and instead of the light source, a waveguide for transmitting light from the light source into the flow path may be used.

Since the waveguide may be formed thinner than the light source, a phenomenon that obstructs the flow of fluid may be minimized. In addition, the waveguide has the advantage of not transferring heat from the light source. In addition, since the waveguide does not require a separate electrical facility for operation, maintenance is easy.

1 is a schematic diagram showing a sterilization device of the present invention.
2 is a schematic diagram showing a sterilizer according to a comparative embodiment of the present invention.
3 is a schematic diagram showing a waveguide according to an embodiment.
4 is a schematic diagram showing a waveguide according to another embodiment.
5 is a schematic diagram showing a first pattern.
6 is a schematic diagram showing a second pattern.
7 is a schematic diagram illustrating a cross-sectional shape of a reflective groove according to an exemplary embodiment.
8 is a schematic view showing a cross-sectional shape of a reflective groove according to another embodiment.
9 is a schematic diagram showing a waveguide and a reflection groove according to a first embodiment of the present invention.
10 is a schematic diagram showing a waveguide and a reflection groove according to a second embodiment of the present invention.
11 is a three-dimensional image showing a reflective groove formed by using a laser.
12 is a photograph showing an experimental result in a state in which light in the UV band is incident through one end of the waveguide after a reflective groove is formed only on a part of the other end of the waveguide.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

In this specification, redundant descriptions of the same components are omitted.

In addition, in this specification, when a component is referred to as being 'connected' or 'connected' to another component, it may be directly connected or connected to the other component, but another component in the middle It should be understood that may exist. On the other hand, in this specification, when a component is referred to as 'directly connected' or 'directly connected' to another component, it should be understood that no other component exists in the middle.

In addition, terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention.

Also, in this specification, a singular expression may include a plurality of expressions unless the context clearly indicates otherwise.

In addition, in this specification, terms such as 'include' or 'having' are only intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more It should be understood that the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Also in this specification, the term 'and/or' includes a combination of a plurality of listed items or any item among a plurality of listed items. In this specification, 'A or B' may include 'A', 'B', or 'both A and B'.

Also, in this specification, detailed descriptions of well-known functions and configurations that may obscure the subject matter of the present invention will be omitted.

1 is a schematic diagram showing a sterilization device of the present invention.

The sterilization device shown in FIG. 1 may include a waveguide 110 and a light source 130 .

A filter 90 installed in the passage 50 through which fluid such as gas or liquid flows may be provided. Fluid may be input from the first surface of the filter 90 and fluid may be output from the second surface of the filter 90 .

The filter 90 may filter 90 various foreign substances, bacteria, fungi, etc. contained in the air. Foreign substances, bacteria, and mold may remain in the filter 90 through the filter 90 ringing process. To prevent the growth of bacteria and mold, the filter 90 needs to be sterilized.

Since it is practically difficult to physically sterilize the filter 90 installed in the flow path 50 through which the fluid flows, a method of optically sterilizing the filter 90 may be applied.

The waveguide 110 (waveguide) may be disposed to face a sterile surface including at least one of the first and second surfaces of the filter 90 . In other words, the waveguide 110 may be disposed facing the first surface or disposed facing the second surface. Alternatively, some waveguides 110 may face the first surface and other waveguides 110 may face the second surface.

When light in the UV band is input from one side of the waveguide 110, the light in the UV band may be propagated or transmitted along an extension direction. The waveguide 110 may serve as a kind of path or tube through which light flows. For example, the waveguide 110 may be formed based on a material such as quartz or polymer having a light transmittance of 50% or more in an ultraviolet (UV) band wavelength.

In this case, the UV band wavelength may be provided in the range of 100 nanometers to 400 nanometers, and may be limited to wavelengths having the range of 200 nanometers to 280 nanometers in order to improve the sterilization effect.

The waveguide 110 may include an optical fiber. The optical fiber may include a core region through which light in the UV band propagates, and a clad preventing light in the UV band from escaping out of the optical fiber. The refractive index of the core may be greater than that of the clad.

The light source 130 may include a lamp that generates light in the UV band. The light source 130 may input light in the UV band to the waveguide 110 . When the waveguide 110 is formed in a rod shape, the light source 130 may be formed to irradiate light in the UV band toward one end of the waveguide 110 . Light in the UV band incident to one end of the waveguide 110 may propagate along the waveguide 110 .

According to the waveguide 110, light in the UV band irradiated from the light source 130 may spread along the waveguide 110 to locations facing the sterilization surface.

The waveguide 110 of the sterilization device may be formed not only to propagate light in the UV band along the extension direction, but also to radiate light in the UV band toward the sterilization surface.

Due to the waveguide 110 of the sterilization device of the present invention, the installation position of the light source 130 is not limited to the position facing the sterilization surface and can be freely extended.

For example, the light source 130 may be disposed at a location away from the flow channel 50 through which fluid flows. In this case, the light in the UV band of the light source 130 is not directly radiated to the sterilization surface, but can be propagated throughout the sterilization surface using the waveguide 110. In order to propagate light in the UV band at least to a position facing the sterilization surface, the waveguide 110 may be formed to cross the passage 50 where the sterilization surface is located. At this time, one end of the waveguide 110 may be disposed to face the light source 130 . Light in the UV band based on the light source 130 disposed outside the passage 50 may be introduced through one end of the waveguide 110 and may enter the inside of the passage 50 along the waveguide 110 .

The light source 130 and the waveguide 110 may be disposed at set intervals along a first direction parallel to the sterilization surface. In FIG. 1 , the vertical direction may correspond to the first direction.

The waveguide 110 may extend along a second direction perpendicular to the first direction while being parallel to the sterile surface.

A first support 11 extending along the first direction may be provided. A plurality of light sources 130 may be supported on the first support 11 .

A second support 12 extending along the first direction may be provided. With respect to the filter 90 , when the light source 130 is disposed on one side of the passage 50 through which the fluid flows, the second support 12 may be disposed on the other side of the passage 50 . In this case, the plurality of waveguides 110 may be supported by the second support 12 .

As shown in FIG. 2 , a situation in which the light source 130 is formed in the flow path 50 may be assumed.

2 is a schematic diagram showing a sterilizer according to a comparative embodiment of the present invention.

In the comparative example of FIG. 2 , the light source 130 is directly installed at every location facing the sterilization surface. In this case, the light in the UV band of the light source 130 can be accurately irradiated throughout the sterilization surface. However, a problem may arise in that the light source 130 acts as resistance to the movement of the fluid. Of course, in this embodiment in which the waveguide 110 is applied, the waveguide 110 may act as a resistance. However, since the waveguide 110 occupies a very small area in the flow path 50 compared to the light source 130, the resistance to the fluid is higher compared to the light source 130 (including various supporting means, electric supply lines, etc.) There are not many advantages.

In other words, the area of the waveguide 110 on the cross-sectional area of the passage 50 may be smaller than the area of the light source 130 of the comparative example installed in the passage 50 . This means that the waveguide 110 can smoothly maintain the open state of the flow path 50 compared to the light source 130 .

In addition, when the waveguide 110 is used, a phenomenon in which heat generated from the light source 130 is directly applied to the flow path 50 or the filter 90 can be fundamentally prevented. As a result, various adverse effects (bacterial growth, etc.) negatively acting on the flow path 50 due to the heat of the light source 130 can be suppressed.

3 is a schematic diagram showing a waveguide 110 according to an embodiment. 4 is a schematic diagram showing a waveguide 110 according to another embodiment.

The waveguide 110 may be formed in a bar shape extending parallel to the sterilization surface. The waveguide 110 may propagate light in the UV band input from the light source 130 along an extension direction. If light in the UV band is input to one end of the waveguide 110 , the light in the UV band may propagate along the waveguide 110 and be output through the other end of the waveguide 110 . According to this, as shown in FIG. 3 , light in the UV band having an intensity having a sterilizing effect can be output only at the other end of the waveguide 110 . It is advantageous to minimize the number of waveguides 110 as much as possible so as not to interfere with the flow of fluid. You need to let this leak out. A pattern may be formed in the waveguide 110 to change the propagation direction of the UV band light so that a part of the UV band light propagating along the extension direction leaks out from the center of the waveguide 110 and is radiated toward the sterilization surface. The pattern may be formed in a protrusion or groove shape. For convenience of processing, it may be advantageous that the pattern is formed in a groove shape.

When one side of the waveguide 110 faces the sterilization surface, the other side of the waveguide 110 opposite to one side emits light in the UV band propagating along the longitudinal direction or extension direction of the waveguide 110 toward the sterilization surface. An intaglio reflective groove 190 may be formed.

When a pattern such as the reflective groove 190 is formed, light in the UV band is output with uniform intensity throughout the waveguide 110 as shown in FIG. 4 and can be irradiated to the sterilization surface.

5 is a schematic diagram showing a first pattern.

The waveguide 110 may be formed in a thin cylindrical shape extending parallel to the sterilization surface. A plurality of reflective grooves 190 formed along an outer circumferential surface of the waveguide 110 may be arranged along an extension direction of the waveguide 110 . The reflection groove 190 may be formed to extend along a direction (eg, a vertical direction) inclined to the extension direction of the waveguide 110 . A reflective groove 190 forming a trench extending in a direction inclined to the extending direction of the waveguide 110 may correspond to the first pattern.

According to the embodiment of FIG. 5 in which a plurality of first patterns are arranged along the extension direction of the waveguide 110, the amount of light reaches 26.65% and the maximum intensity of light in the UV band reaches 60 candelas (cd).

6 is a schematic diagram showing a second pattern.

In FIG. 6 , the second pattern may correspond to the reflective groove 190 extending along the extension direction of the waveguide 110 .

A plurality of second patterns may be arranged along the outer circumferential surface of the waveguide 110 . According to the embodiment of FIG. 6 in which a plurality of second patterns are arranged, the amount of light is only 1.87%.

As a result, the second pattern cannot irradiate light in the UV band with sufficient intensity for sterilization to the sterilization surface to be sterilized. Therefore, it is preferable that the first pattern is formed on the waveguide 110 rather than the second pattern.

Next, a cross-sectional shape of the reflective groove 190 will be examined.

7 is a schematic diagram illustrating a cross-sectional shape of a reflective groove 190 according to an exemplary embodiment. 8 is a schematic diagram showing a cross-sectional shape of a reflective groove 190 according to another embodiment.

In the intaglio reflective groove 190 formed on the outer surface of the waveguide 110, there is a first slope 191 that becomes deeper along the extension direction of the waveguide 110, and a first inclined surface 191 is formed based on an imaginary line perpendicular to the extension direction of the waveguide 110. A second inclined surface 192 that is linearly symmetrical to the first inclined surface 191 may be provided.

As shown in FIG. 7, when light in the UV band propagates from left to right, the light is reflected on the first inclined surface 191 formed on the upper surface of the waveguide 110 as shown in the drawing, and is reflected on the opposite surface of the waveguide 110 (waveguide ( 110), and pass through the corresponding surface to be irradiated to the sterilization surface.

At this time, the reflection angle of the UV band light is affected by the first inclined surface 191 or the second inclined surface 192, and the intensity of the UV band light output from the center of the waveguide 110 may vary according to the reflection angle. .

The drawing on the left side of FIG. 7 shows an embodiment in which the first inclined surface 191 has an angle of 40 degrees, and the drawing on the right side of FIG. 7 shows an embodiment in which the first inclined surface 191 has an angle of 45 degrees.

When the first inclined surface 191 is 40 degrees, the amount of light is 26.65%, and when it is 45 degrees, the amount of light is 26.70%.

In the cases where the first inclined surface 191 is 40 degrees and 45 degrees, the intensity of light in the UV band is up to 60 candela.

The left drawing of FIG. 8 shows an embodiment in which the first inclined surface 191 is 10 degrees, the middle drawing shows an embodiment in which the first inclined surface 191 is 20 degrees, and the right drawing shows an embodiment in which the first inclined surface 191 is 30 degrees. .

The amount of light was 0.95%, 5.22%, and 21.07% in the order of the first inclined surface 191 of 10 degrees, 20 degrees, and 30 degrees, respectively.

When the first inclined surface 191 was 30 degrees, the amount of light was good, but the maximum intensity of light remained at the 50% level compared to the example of 40 degrees to 45 degrees.

Accordingly, it is preferable that the first inclined surface 191 is inclined at an angle of 40 to 45 degrees relative to the extension direction of the waveguide 110 .

On the other hand, when the light in the UV band incident to one end of the rod-shaped waveguide 110 is continuously leaked toward the filter 90 by a pattern in the middle of propagating along the waveguide 110, it is incident, and the light in the UV band is incident. The intensity of light may become weaker toward the other end of the waveguide 110 . It may be advantageous for the entire filter 90 to be irradiated with uniform intensity of light in the UV band.

9 is a schematic diagram showing the waveguide 110 and the reflection groove 190 according to the first embodiment of the present invention. 10 is a schematic diagram showing a waveguide 110 and a reflection groove 190 according to a second embodiment of the present invention.

When the light source 130 is disposed facing one end of the waveguide 110, the depth of the second reflection groove b formed in the waveguide 110 is closer to the first end of the waveguide 110 than the second reflection groove b. It may be formed deeper than the depth of 1 reflective groove a.

A portion of the light in the UV band incident to one end of the waveguide 110 may leak through the filter 90 through the first reflection groove a close to the input side. The light of the remaining UV band remaining after a part leaks out may propagate along the waveguide 110 again and reach the second reflection groove b. The intensity of light in the UV band reaching the second reflective groove b may be in a weakened state due to partial leakage from the first reflective groove a. In this state, if the depth of the second reflective groove b is the same as that of the first reflective groove a, the amount counted toward the filter 90 may be reduced due to the reduced input source. As a result, a portion of the filter 90 facing the second reflecting groove b may be irradiated with light in the UV band having a lower intensity than that of the portion of the filter 90 facing the first reflecting groove 190 b.

However, according to the first embodiment, the depth of the second reflective groove b is greater than the depth of the first reflective groove a.

When the depth of the reflective groove 190 increases, the areas of the first inclined surface 191 and the second inclined surface 192 may increase. The first inclined surface 191 having an increased area may reflect a large amount of UV band light propagating along the waveguide 110 . Through this, the second reflective groove b is reduced to the first reflective groove a, and even though the input source is reduced, UV band light may be radiated to the filter 90 with an intensity similar to that of the first reflective groove a.

In the second embodiment, light in the UV band may be output with uniform intensity throughout the waveguide 110 by adjusting the distance between the reflection grooves 190 .

For example, as shown in FIG. 10 , the first reflective groove a and the second reflective groove b formed closer to one end of the waveguide 110 to which the light in the UV band is incident than the second reflective groove b and the second reflective groove b ( 110) may be provided with a third reflective groove c formed close to the other end.

In this case, the distance between the second reflective groove b and the third reflective groove c may be narrower than the distance between the first reflective groove a and the second reflective groove b.

According to this, if the depth of each reflective groove 190 is the same, the intensity of light in the UV band output from the reflective groove 190 may decrease toward the other end of the waveguide 110 . However, since the distance between each reflective groove 190 decreases toward the other end of the waveguide 110, the weakening of light intensity in the UV band can be supplemented in terms of distance. As a result, from the viewpoint of the filter 90, even according to the second embodiment, light in the UV band can be output with uniform intensity over the entire section in the longitudinal direction (extension direction) of the waveguide 110.

The reflective groove 190 described above can be created through various methods.

For example, when the waveguide 110 includes an optical fiber, the optical fiber may be rotated about a center line of the optical fiber. The reflective groove 190 extending along the outer circumferential surface of the optical fiber may be formed by irradiating the outer surface of the optical fiber with laser while rotating the optical fiber. In this case, the optical fiber may be installed in the manufacturing equipment so as to have a rotational degree of freedom rotatable around the center line. An optical means having a degree of freedom of movement capable of linear movement along the length direction of the optical fiber and emitting a laser may be provided in the manufacturing equipment.

Light in the UV band propagating along the optical fiber manufactured in the above manner may leak out from the center of the waveguide 110 due to the reflection groove 190 and be irradiated to the sterile surface of the filter 90.

11 is a three-dimensional image showing a reflective groove 190 formed using a laser.

Looking at it, the width of the reflective groove 190 is 21.39 micrometers and the depth is 21.74 micrometers. The angle (inclination) of the first inclined surface 191 and the second inclined surface 192 was about 45 degrees, respectively.

According to the previous experimental results, the ratio between the depth and width of the reflection groove 190 satisfies the range of 0.1 to 1. Looking at it from another point of view, when the ratio satisfies the range of 0.1 to 1, it can be experimentally ensured that light in the UV band is uniformly radiated from the entire waveguide 110 and irradiated to the filter 90.

FIG. 12 is a photograph showing an experimental result in a state in which light in the UV band is incident through one end of the waveguide 110 after the reflective groove 190 is formed only on a part of the other end of the waveguide 110 .

Looking at it, it can be seen that in the first section t1 where the reflection groove 190 is formed, light in the UV band leaks out through the side surface of the waveguide 110 with uniform intensity.

On the other hand, it can be seen that in the second period t2 in which the reflection groove 190 is not formed, the light in the UV band cannot leak through the side surface of the waveguide 110 with an intensity sufficient to exhibit the sterilization function.

In summary, the above sterilization device may include a waveguide 110 emitting light in the UV band toward one surface of the filter 90 installed in the flow path 50 through which the fluid flows. The corresponding waveguide 110 may receive light in the UV band from the light source 130 installed at a location away from the passage 50 . The corresponding waveguide 110 may be formed to be thinner than the light source 130 so as to less disturb the flow of the flow path 50 compared to when the light source 130 is disposed within the flow path 50 .

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. fall within the scope of the invention.

11... 1st support
12... 2nd support
50... euros
90...Filter
110 ... Waveguide
130 ... light source
190...reflection groove
191 ... first slope
192 ... second slope

Claims (13)

A waveguide disposed to face a sterilization surface including at least one of the first surface and the second surface when a filter is provided in which fluid is input to the first surface and then output to the second surface;
Including; a light source for inputting light in the UV band to the waveguide;
The waveguide is formed to emit light in the UV band toward the sterilization surface.
According to claim 1,
The light source is disposed at a position away from the flow path through which the fluid flows,
The waveguide is formed to cross the flow path,
One end of the waveguide is disposed facing the light source.
According to claim 1,
The light source and the waveguide are arranged at set intervals along a first direction parallel to the sterilization surface,
Each waveguide is parallel to the sterilization surface and extends along a second direction perpendicular to the first direction.
According to claim 3,
A first support is provided extending along the first direction,
The light source is supported on the first support.
According to claim 3,
A second support is provided extending along the first direction,
Based on the filter, when the light source is disposed on one side of the passage through which the fluid flows, the second support is disposed on the other side of the passage,
The waveguide is a sterilization device supported by the second support.
According to claim 1,
The waveguide is formed in a rod shape extending parallel to the sterilization surface,
The waveguide propagates the light of the UV band input from the light source along an extension direction,
A pattern for converting the traveling direction of the UV band light is formed on the waveguide so that a part of the UV band light propagating along the extension direction leaks out from the center of the waveguide and is radiated toward the sterilization surface. Sterilization device.
According to claim 1,
The waveguide is formed in a rod shape extending parallel to the sterilization surface,
When one surface of the waveguide faces the sterilization surface, the other surface of the waveguide opposite to the one surface has an intaglio reflective groove for radiating the UV band light propagating along the length direction of the waveguide toward the sterilization surface. Formed sterilization device.
According to claim 1,
An intaglio reflective groove is formed on the outer surface of the waveguide,
The reflective groove is provided with a first inclined surface that becomes deeper along the extension direction of the waveguide and a second inclined surface that is line-symmetrical to the first inclined surface based on a virtual line perpendicular to the extension direction.
According to claim 8,
Based on the extension direction of the waveguide, the first inclined surface is inclined by an angle of 20 degrees to 80 degrees.
According to claim 1,
The waveguide is formed in a cylindrical shape extending parallel to the sterilization surface,
A plurality of reflective grooves formed along an outer circumferential surface of the waveguide are arranged along an extension direction of the waveguide,
The reflective groove is a sterilization device formed to extend along a direction inclined to the extension direction of the waveguide.
According to claim 10,
When the light source is disposed facing one end of the waveguide,
The depth of the second reflective groove formed in the waveguide is deeper than the depth of the first reflective groove formed closer to one end of the waveguide than the second reflective groove.
According to claim 10,
The light source is disposed to face one end of the waveguide, and a second reflective groove, a first reflective groove formed closer to one end of the waveguide than the second reflective groove, and the other end of the waveguide than the second reflective groove When the closely formed third reflective groove is provided,
The distance between the second reflective groove and the third reflective groove is narrower than the distance between the first reflective groove and the second reflective groove.
According to claim 1,
the waveguide comprises an optical fiber;
A reflective groove extending along an outer circumferential surface of the optical fiber is formed by irradiating a laser to the outer surface of the optical fiber while rotating the optical fiber;
The light of the UV band propagating along the optical fiber leaks from the center of the waveguide due to the reflection groove and is irradiated to the sterilization surface.

Images