KR102447557B1 - Fine dust blocking mask apparatus - Google Patents

Abstract

A mask device for blocking fine dust is disclosed. The present invention relates to a mask device for blocking fine dust comprising a mask capable of forming an air curtain, a driving unit capable of supplying clean air to the mask, and a ventilation pipe connecting the mask and the driving unit and transferring air,
The mask may include a body portion; a close support part installed on the inner side of the upper part of the body part and capable of being in close contact with the user's nose and face; and an air curtain portion formed at both ends and the bottom end of the body portion,
The inside of the body part is formed as a hollow part, so that air can flow inside the body part.

Description

Mask device for blocking fine dust {FINE DUST BLOCKING MASK APPARATUS}

The present invention relates to a mask device for blocking micro-merge, and more specifically, by forming an air curtain around the user's respirator to block the inflow of polluted external air, while at the same time supplying fresh and clean air purified through a filter to the area around the respirator It relates to a mask device for blocking fine dust using an air curtain to supply and provide comfortable air.

Unlike in the past, modern people are threatened with respiratory health by various harmful gases, yellow dust, and fine dust. This is a phenomenon that mankind is experiencing in the era of industrialization, and air pollution is intensifying in proportion with the development of industry and the benefits of cities.

The causes of air pollution are divided into natural, such as desert sandstorms and volcanic eruptions, and artificial, such as waste gas from factories and combustion of fuel.

In general, natural pollutants are generated by the physiology of nature and are temporary, so they do not pose a constant threat to human respiratory health. However, artificial pollutants are emitted from fuel combustion, nuclear energy generation using nuclear energy, chemical reactions, physical processes, and automobiles and aircraft, etc. The main cause is various pollutants generated during fuel combustion, and human respiratory health has a lasting adverse effect on

Among them, carbon monoxide (CO), nitrogen dioxide (NO2), and sulfurous acid gas (SO2) occupy a high proportion. In particular, sulfur dioxide (SO2) reacts with other air pollutants to create additional secondary pollutants. Air pollutants can be classified into gaseous substances such as sulfur dioxide and carbon monoxide and particulate substances such as dust according to particle size.

In addition, yellow dust, dust wind, pollen, airborne bacteria, wildfires, volcanic eruptions, etc. are major causes of air pollution and threaten human health.

In addition, air pollution in construction sites, cleaning sites, specific manufacturing plants, painting plants, hospitals, etc. is a more serious situation.

In particular, fine dust, which has a great influence on modern society, is a suspended matter in the atmosphere with various complex components, and refers to particulate matter with a diameter of 10 μm or less. It is mainly generated when fossil fuels such as coal and petroleum are burned. In particular, it is an air pollutant that is generated in large quantities from exhaust gases such as manufacturing plants and automobiles.

Such fine dust is mainly composed of combustion particles such as carbon, organic hydrocarbons, nitrates, sulfates, and toxic metals, and is known to be related to the occurrence of respiratory and cardiovascular diseases and to increase mortality.

Accordingly, devices for removing fine dust have been developed, such as 'A dust collector capable of removing fine dust', which is a prior art document, Republic of Korea Patent Publication No. 10-1633878 No. 10-1633878.

The above-mentioned prior document (No. 10-1633878) is a lower frame, a frame support fixed by a coupling member on the upper portion of the lower frame, and the frame support in a state supported by a guider on the inside of the support so as to move up and down coupled to the To provide a dust collector capable of removing fine dust comprising a filter housing, a filter plate coupled to the filter housing to filter out dust, and a vibration generating device installed in the lower frame to apply vibration to the filter housing, A technology capable of removing large-capacity dust by enabling the fine dust adhering to the filter due to long-time use or a lot of dust to be shaken off reliably and quickly by the vibration of raising and lowering the filter plate has been disclosed.

However, the prior literature has a limitation that modern people with a lot of activity as a device having a dust collection function cannot use it while going out or moving.

Therefore, in recent years, various attempts have been made to protect the respiratory health of people in such an environment, and one of them is the development of a mask.

Since the main respiratory system of humans is the nose and mouth, it is to protect the nose and mouth with a mask to prevent direct inhalation of air pollutants.

In the development of such a mask, the most important thing to focus on is airtightness.

In other words, it should aim to improve the technology to prevent external harmful substances such as fine dust and harmful gases from entering the inside of the mask.

However, the mask with improved sealing properties has a problem that interferes with the user's breathing.

Therefore, the development of a mask that does not obstruct the user's breathing as it has a structure that does not completely seal the user's respiratory tract and can supply only clean and safe air that is blocked and filtered from external harmful substances to the user is required. .

1. Republic of Korea Patent No. 10-1633878 (2016.06.21) 2. Republic of Korea Application No. 10-2018-0160992 (2018.12.13)

An object of the present invention is to form an air curtain around the respirator to block the inflow of polluted external air and blow purified air through the provided filter to the area around the respirator, so that it is easy to carry and does not cover the user's respirator. An object of the present invention is to provide a mask device for blocking fine dust that enables blocking of fine dust by implementing a mask in the form of a mask.

Another object of the present invention is to provide a mask device for blocking fine dust that can be attached and fixed in close contact with the shape of the user's nose or face, thereby making attachment and detachment simple and easy.

Another object of the present invention is to provide a mask device for blocking fine dust so that the blowing direction of the air curtain can be adjusted at various angles.

In order to achieve the above object, the mask device for blocking fine dust according to the present invention includes a mask capable of forming an air curtain, a driving unit capable of supplying clean air to the mask, and connecting the mask and the driving unit to transport air In the mask device for blocking fine dust including a ventilation pipe for

The mask may include a body portion; a close support part installed on the inner side of the upper part of the body part and capable of being in close contact with the user's nose and face; and an air curtain portion formed at both ends and the bottom end of the body portion,

The inside of the body part is formed as a hollow part, so that air can flow inside the body part.

Further comprising a breathing unit in the inner center of the main body, the breathing unit is characterized in that a plurality of vent holes are formed to receive air.

The body portion is formed of a flexible material while maintaining the shape of the plastic series, and has a 'V' shape so that it can be spread and closely attached while being inserted into the user's face with the user's nose as the center.

In order to form an air curtain, it is characterized in that a plurality of fine holes are formed at both ends and the bottom end of the main body.

The close contact support part is formed of a silicone material, and it is characterized in that it is horizontally long and installed inside the upper part of the main body part.

Both sides of the body part further include a direction changing part, the direction changing part is characterized in that it is formed of a material capable of adjusting the length of the corrugated shape.

According to the present invention, an air curtain is formed around the respirator to block the inflow of polluted external air and to blow purified air through the provided filter into the respirator area, so that it is easy to carry and does not cover the user's respirator. It has the effect of making it possible to block fine dust by implementing a mask in the form of a mask.

According to the present invention, there is an effect that can be attached and detached simply and easily by allowing it to be fixed in close contact with the shape of the user's nose or face.

According to the present invention, it is possible to adjust various angles of the blowing direction of the air curtain, so that the inflow of fine dust can be reliably prevented regardless of the size of the user's face or the shape of the mask.

According to the present invention, by combining a separate clean air bag and mounting a micro fan on the mask, there is an effect that the clean air bag can be purchased and inhaled at any time.

1 is a view schematically showing a mask device for blocking fine dust according to the present invention.
2 is a rear view of the mask device for blocking fine dust according to the present invention.
3 is a bottom view of the mask device for blocking fine dust according to the present invention.
4 is a left side view of the mask device for blocking fine dust according to the present invention.
5 is a plan view of a mask device for blocking fine dust according to the present invention.
6 is a bottom perspective view of the mask device for blocking fine dust according to the present invention.
7 is a plan perspective view of a mask device for blocking fine dust according to the present invention.
8 is a state diagram of the use of the mask device for blocking fine dust according to the present invention.
9 is a block diagram showing the configuration of the environmental sensor unit and the control unit of the mask for blocking fine dust using an air curtain according to the present invention.
10 is a view showing a state in which a separate air bag is mounted in the mask device for blocking fine dust according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, it should be noted that the same components or parts in the drawings are denoted by the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related known functions or configurations are omitted so as not to obscure the gist of the present invention.

The mask device for blocking fine dust according to the present invention includes a mask (10) capable of forming an air curtain, a driving unit (200) capable of supplying clean air to the mask (10), and the mask (10) and driving unit (200) and a ventilation pipe 300 for connecting and transporting air.

As shown in Figures 1 to 3, the mask 10, the body portion 20 having a hollow portion formed therein, is installed inside the upper portion of the body portion 20 and can be in close contact with the user's nose and face. It includes a close contact support part 30, a breathing part 50 formed in the inner center of the main body 20, and an air curtain part 60 formed at both ends and the bottom end of the main body 20.

The main body 20 is formed of a flexible material while maintaining a plastic-based shape, and preferably has a 'V' shape so that it can be spread and closely attached while being inserted into the face centering on the user's nose. That is, the main body 20 can take a 'V' shape before use, and while the user inserts it into the face with the nose as the center, it expands and firmly adheres to the face.

In addition, since the inside of the main body 20 is formed of a hollow part 22, air can flow therein. In addition, since a plurality of fine holes 25 are formed at both ends and the bottom end of the main body 20, an air curtain can be formed while air is blown out.

That is, as shown in FIG. 1 , the body portion 20 is divided into an outer surface 23 and an inner surface 24 , and a hollow part 22 composed of an empty space between the outer surface 23 and the inner surface 24 . ) is formed.

Referring to FIG. 2 , a breathing unit 50 is provided at the center of the inner wall of the main body 20 , and the breathing unit 50 has a plurality of vent holes 53 formed therein, so that the main body part ( The fresh air flowing through the hollow part 22 of 20) is supplied through the plurality of vent holes 53 so that the user can inhale it.

The close support part 30 is formed of a silicone material, and when it is in close contact with the user's face, it has a property of not easily falling due to the characteristics of the material. As shown in FIG. 3 , the close contact support part 30 may be installed horizontally on the inner side of the upper portion of the main body 20 to be positioned under the user's eyes. In addition, the close contact support portion 30 is formed with a concave concave portion 33 in a portion in contact with the nose, so that the shape can be freely deformed so that it can be optimally adhered to the shape of the face and nose.

In addition, both sides of the main body portion may further include a direction changing portion (40). The direction changing part 40 is formed of a material capable of adjusting the length of the corrugated shape, so that the direction of the side air curtain part of the body part 20 can be adjusted at various angles around the direction changing part 40 . Accordingly, as shown in FIG. 8 , by adjusting the direction of the air curtain unit around the direction changing unit 40 , the blowing direction of air can be changed toward the face or toward the outside of the face. By doing this, it is possible to more effectively and efficiently deal with the blocking of fine dust.

The air curtain unit 60 is formed by spraying air through a plurality of micro-holes 25 formed on both ends and the bottom surface of the mask 10 body 20, and through the air curtain unit 60 It is possible to block the open space of both sides and the bottom of the mask 10 (see FIGS. 6 and 7). At this time, it is preferable that the upper end of the main body 20 is sealed.

Therefore, the air curtain unit 60 forms an air curtain on both sides or the lower end of the mask 10 so as to prevent fine dust and foreign substances from entering the user's respiratory tract, that is, the mask 10 inside. that can be blocked.

When the air curtain is formed, this causes a Coanda effect to occur.

Here, the Coanda effect refers to a phenomenon in which the airflow from the approaching surface is sucked and attached to the surface and flows. And, thereby, it is possible to block the inflow of the unfiltered material into the mask unit 100 .

In addition, as shown in FIG. 1 , the driving unit 200 is provided with a filter that filters fine dust of the introduced outside air to supply the filtered air to the mask 10 .

Specifically, as a component provided to purify external air, the driving unit 200 may be provided to be mounted on the user's body, that is, the forearm as shown.

In addition, although not shown as a component provided to purify external air, the driving unit 200 may be provided to be mounted on an appropriate part of the user's body or mounted on a user's bag.

Accordingly, the driving unit 200 includes an inlet 210, a filter 220, a deodorizing filter 290, a blower fan 230, a heating unit 240, a humidification unit 250, an injection port 260, a battery unit ( 270), it may include an environmental sensor unit (280).

The inlet 210 is a portion through which outside air is introduced into the driving unit 200 .

Specifically, the inlet 210 may be provided on one side of the shopping mall driving unit 200 to have a tubular shape provided so that outdoor air to be purified can be introduced into the driving unit 200 .

The filter 220 may be a filter provided to purify the air introduced into the inlet 210 .

Specifically, the filter 210 may be disposed on one side of the driving unit 200 to purify external air and supply it to the inner space of the mask 10 .

In addition, the filter 220 may be an air filter made of nanofibers having a pore size of 0.01 to 0.59 μm.

In addition, the filter 220 may be configured as either a HEPA filter or a pre-filter, and may be configured as a slide-type replaceable filter having a filter cartridge (not shown) that informs the replacement time of the filter.

Specifically, the filter 220 may include a filter cartridge (not shown) capable of indicating the replacement time by a message, text, or alarm sound when dust or contaminants greater than a preset reference value are collected.

Accordingly, the filter 220 is implemented in a detachable manner, and the filter 220 may be provided to be mounted in an interference fit or magnetic contact method.

Accordingly, the filter 220 is more preferably a mounting hole (not shown) to which the filter 220 is mounted so as to be easily attached and detached, is implemented with a material such as rubber, silicone, or plastic.

The deodorizing filter 290 is disposed on one side adjacent to the filter, and is made of carbonaceous activated carbon with strong adsorption to remove odor components in the filtered air.

Specifically, the deodorizing filter 290 has a deodorizing effect for removing odors in the air, and is also called an activated carbon filter or a carbon filter.

In addition, the deodorizing filter 290 may perform filtering and deodorizing action on various harmful substances including nanoscale harmful substances.

Accordingly, the deodorizing filter 290 exhibits a deodorizing effect by using an adsorption action using activated carbon as an adsorbent for absorbing odors and a catalytic reaction of decomposing odor molecules using a catalyst.

In addition, the deodorizing filter 290 according to the present invention may use a well-known thing capable of producing the above-described effect.

The blowing fan 230 is provided to supply the filtered air introduced into the filter 220 to the mask 10 .

Specifically, the blowing fan 230 may be a fan in which a plurality of rotor blades are disposed, and supplies the filtered air flowing in from the filter 220 to the inner space of the mask 10 .

In addition, the blower fan 230 is connected to the battery unit 270 to receive power to operate and to be controlled by the control unit 600 .

In addition, as the blowing fan 230, a well-known one may be used.

The heating unit 240 is disposed on one side adjacent to the filter 220 to heat the air introduced through the filter 220 .

Specifically, the heating unit 240 is disposed on one side of the filter 220 and the blowing fan 230 of the driving unit 200 to heat the air introduced through the filter 220, and the battery unit ( 270) to be heated by the power supplied from the battery unit 270.

The heating unit 240 may be configured in the form of heating wires arranged in a predetermined length, and the heating temperature may be suitable between 34 and 38° C., but may be variously applied according to a user's setting.

The above temperature range is similar to the human body temperature range, so the user does not feel hot or cold. can

In addition, the heating unit 240 is provided so that the user can operate according to a preset temperature under the control of the control unit.

The humidifying unit 250 may be disposed on one side adjacent to the heating unit 240 to humidify the air introduced through the filter 220 .

Specifically, the humidification unit 250 is provided to supply water vapor to the air purified by the driving unit 200 to maintain an appropriate humidity, and maintains a certain humidity due to dry weather or a user's illness such as a cold. It is a component provided so that it can be used when necessary.

Accordingly, the humidification unit 250 includes a humidifying water tank 251 having an ultrasonic vibrator built-in on one side, a heating element 252 installed on one side of the lower surface of the humidifying water tank 251 to heat water to a predetermined temperature, and the humidification. It may include a spray nozzle 253 for spraying the vapor vaporized in the water tank 251.

In addition, the humidification unit 250 may be operated in a preset humidity range under the control of the controller 600 , and is connected to the battery unit 270 to receive power from the battery unit 270 to be operated. can

In addition, the humidifying unit 250 may be formed of the above-described components, but in the present invention, the humidifying unit 250 is not limited thereto, and other known humidifying members having the same effect may be applied. .

Therefore, the humidification unit 250 has the effect that the mask 1 for blocking fine dust using the air curtain according to the present invention can prevent the user's disease in advance by blocking the fine dust, as well as providing the user with the disease. There is also the advantage of giving a therapeutic effect due to humidification.

The injection hole 260 flows into the filter 220 to discharge the filtered purified air to the air supply pipe 300 .

Specifically, the injection hole 260 may have a tubular shape that is connected to the air supply pipe 300 so that the purified air that has been filtered by the driving unit 200 can be transferred to the mask 10 .

The battery unit 270 may be disposed on one side of the blowing fan 230 to supply power to the driving unit 200 .

Specifically, the battery unit 270 is provided to supply power to the driving unit 200 , and more specifically, the blowing fan 230 , the heating unit 240 , the humidification unit 250 , and the environmental sensor unit. It may be provided to supply power to the 280 .

In addition, the battery unit 270 may use a secondary battery for light weight and user properties.

For example, a lithium ion battery, a lithium polymer battery, etc. may be suitable.

In addition, the battery unit 270 may be applied to a wireless charging method currently used in terminals and the like.

The environmental sensor unit 280 may be a sensor that is disposed on one side of the outside of the driving unit 200 and measures an external air state.

Specifically, the environmental sensor unit 280 is a sensor provided on one side of the outside of the driving unit 200 to measure the state of the outside air, and a temperature measuring sensor 281 for measuring the temperature of the outside air, and measuring the humidity of the outside air. It may include a humidity measuring sensor 282 and a fine dust measuring sensor 283 for measuring the concentration of fine dust in the outside air.

In addition, the environment sensor unit 280 is connected to the control unit 600 through wireless communication so that the outdoor air information measured by the environment sensor unit 280 can be transmitted to the control unit 600 .

Accordingly, the control unit 600 is configured to operate the filter 220, the heating unit 240 and the humidifying unit 250 of the driving unit 200 due to the external air information transmitted from the environmental sensor unit 280. do.

In addition, the environment sensor unit 280 may use a known sensor.

The air supply pipe 300 may have a longitudinal tubular shape provided to transport the air injected from the driving unit 200 to the mask 10 .

Specifically, the air blower pipe 300 is provided such that one end is connected to the injection port 260 of the driving unit 200 and the other end is connected to the blowing nozzle 400 and the air curtain forming nozzle 500 of the mask 10 . so that the air purified by the driving unit 200 can be transferred to the mask 10 .

In addition, the air supply pipe 300 is configured to be longer than the distance from the user's body on which the driving unit 200 is mounted to the face on which the mask 10 is mounted, so that the user can use the mask 10 during the activity. It can be configured so as not to feel discomfort.

The blowing nozzle 400 may be provided in plurality in the shape of a nozzle protruding from the inner upper end of the mask 10 and supplying filtered air to the user's respirator.

9 is a block diagram showing the configuration of the environmental sensor unit and the control unit of the mask for blocking fine dust using an air curtain according to the present invention.

As shown in FIG. 5 , the control unit 600 is provided to control the operation of the main body 200 in response to the external air state measured by the environmental sensor unit 280 .

Specifically, the control unit 600 controls the operation of the main body 200, and matches the external air information measured by the environmental sensor unit 280 with preset user information to operate the main body 200. to be able to control

Accordingly, the control unit 600 may include an environment information sensing unit 610 and a main control unit 630 .

The environment information sensing unit 610 is provided to receive the surrounding environment information measured by the environment sensor unit 280 .

The main control unit 630 controls the operation of the main body 200 as a whole according to the surrounding environment information measured through the environment sensor unit 280 and the wireless control signal received from the external user terminal C by user manipulation. Control to control the air injection through the air supply pipe 300 and wireless transmission of the surrounding environment information to the external user terminal (C).

Accordingly, the control unit 600 compares the output value measured by the environmental sensor unit 280 with a preset information value, and operates the blower fan 230 when the output value does not match the information value to operate the ventilation pipe It can be programmed to supply purified air to the blowing nozzle 400 through 300 and to stop the operation of the blowing fan 230 in other cases.

In addition, the control unit 600 automatically controls the heating unit 240 and the humidifying unit 250 using the temperature and humidity values of the ambient air measured by the temperature measuring sensor 281 and the humidity measuring sensor 282 . It can be configured so that cold or dry air from the outside can be sprayed warmly and wet by driving to the .

In addition, the control unit 600 may prevent unnecessary operation by stopping the overall operation of the mask 1 when the state of the outside air is within a predetermined appropriate range.

In addition, the control unit 600 is interlocked with an external user terminal (C) to receive information about the mask (1) for blocking fine dust using the air curtain wirelessly using the user terminal (C), and operate make it possible

The wireless communication unit 700 is connected to a wireless communication module and a local area wireless communication network, and performs wireless communication with an external user terminal (C) to receive and transmit a wireless control signal transmitted from the user terminal (C), or to transmit or receive the user terminal (C). ) to wirelessly transmit surrounding environment information.

In addition, the wireless communication unit 700 is LTE, LTE Advance (LTE-A), CDMA (code division multiple access), WCDMA (wideband CDMA), UMTS (universal mobile telecommunications system), WiBro (Wireless Broadband), or GSM ( Global System for Mobile Communications) and the like may include cellular communication using at least one.

Also, the wireless communication unit 700 may include, for example, at least one of wireless fidelity (WiFi), Bluetooth, Bluetooth low energy, Zigbee, NFC, magnetic secure transmission, radio frequency, and a body area network.

Therefore, the mask 10 for blocking fine dust using the air curtain according to the present invention can transmit and receive external air information and operation information with the user terminal C using the wireless communication unit 700, and the mask ( There is an effect of allowing the operation of 1) to be operated by the user terminal (C).

10 is a view showing a state in which a separate air bag is mounted in the mask device for blocking fine dust according to another embodiment of the present invention.

As shown in FIG. 10 , in the mask device for blocking fine dust according to another embodiment of the present invention, a micro fan 8 is installed in the main body 20 of the mask 10 and the micro fan 85 is It is the same as the mask device for blocking fine dust according to an embodiment of the present invention, except that a structure for connecting the clean air bag 80 is further added.

Therefore, in the mask device for blocking fine dust according to another embodiment of the present invention, the clean air bag 80 can be purchased at any time according to the user's need and fresh air can be inhaled through the mask 10 .

By forming an air curtain around the respirator, it blocks the inflow of polluted external air and at the same time collects information about the current environment through various sensors. It can be blown, so it has the effect of providing a comfortable breathing environment to the user.

The terms and words used in the present specification and claims described above should not be construed as being limited to conventional or dictionary meanings, and the present inventors have adequately defined the concept of terms to describe their invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined in

Accordingly, the configurations shown in the drawings and embodiments described in this specification are only one of the most preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention, so they can be substituted at the time of the present application. It should be understood that there may be various equivalents and variations that exist.

10: mask 20: body part
22: hollow part 25: fine hole
30: close contact support 33: concave
40: direction change unit 50: breathing unit
53: vent hole 60: air curtain unit

Claims (7)

the mask,
including a body part,
The body portion is divided into an outer surface and an inner surface, and a hollow part composed of an empty space is formed between the outer surface and the inner surface so that air can flow inside the main body portion,
Further comprising a breathing unit in the inner center of the main body,
The breathing unit is a mask for blocking fine dust, characterized in that a plurality of vent holes are formed to receive air, and the air flowing through the hollow part of the main body is supplied in a direction perpendicular to the user's mouth through the plurality of vent holes. Device. The method of claim 1,
The mask further includes; air curtain portions formed on both ends and the bottom end of the body portion,
A mask device for blocking fine dust, characterized in that a plurality of fine holes are formed at both ends and the bottom end of the main body to form the air curtain part. The method of claim 1,
The mask is installed in the upper inner side of the main body, the mask device for blocking fine dust, characterized in that it further comprises a close support that can be in close contact with the user's nose and face. 4. The method of claim 3,
The close support part is formed of a silicone material,
A mask device for blocking fine dust, characterized in that it is horizontally long and installed inside the upper part of the main body. The method of claim 1,
The body part is formed of a flexible material while maintaining the shape of a plastic type, and has a 'V' shape to be spread and closely adhered while being inserted into the face around the user's nose. . The method of claim 1,
On both sides of the body part, it further includes a direction changing part,
The direction changing part is a mask device for blocking fine dust, characterized in that it is formed of a material capable of adjusting the length of a wrinkled shape. The method of claim 1,
A micro fan is installed in the main body of the mask,
A mask device for blocking fine dust, characterized in that by connecting a clean air bag to the micro-fan, fresh air can be inhaled through the mask.

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