KR102262255B1 - Etching device for liquid crystal panel and etching method using the same - Google Patents

Abstract

The present invention provides a protection unit provided in a liquid crystal panel; And it relates to an etching apparatus for a liquid crystal panel comprising a penetration preventing unit for preventing an object from penetrating into the liquid crystal panel.

Description

Etching apparatus for liquid crystal panel and etching method using same {ETCHING DEVICE FOR LIQUID CRYSTAL PANEL AND ETCHING METHOD USING THE SAME}

The present invention relates to an etching apparatus for a liquid crystal panel and an etching method using the same, and more particularly, to an etching apparatus for a liquid crystal panel for preventing an etchant from flowing into a non-etching region of a liquid crystal panel, and an etching method using the same.

With the development of an information society, a display device capable of displaying information is being actively developed. The display device includes a liquid crystal display device, an organic electro-luminescence display device, a plasma display panel, and a field emission display device.

Among them, the liquid crystal display has advantages such as lightness, thinness, small size, low power consumption, and realization of full color video, and is widely applied to mobile phones, navigation systems, monitors, and televisions.

A liquid crystal display displays an image corresponding to a video signal by adjusting the light transmittance of liquid crystal cells on a liquid crystal panel.

Typically, a liquid crystal panel includes a lower substrate, an upper substrate, and a liquid crystal layer interposed between these substrates.

A TFT-LCD using a thin film transistor (TFT) as a switching element is mainly used in the liquid crystal display device. A plurality of display signal lines such as a gate line, a data line, a plurality of thin film transistors, and a pixel electrode are formed on the lower substrate of the two substrates of the liquid crystal panel disposed to face each other, and the upper substrate of the two substrates has a color filter and a common electrode. is formed

Since such a liquid crystal panel is usually manufactured in a flat shape, when a curved display is required, an etching solution is sprayed on the liquid crystal panel to thin the liquid crystal panel to a set thickness, and then the liquid crystal panel is bent.

In the conventional case, when etching the liquid crystal panel, in order to protect the side and outer portions of the liquid crystal panel from etching solution, the side portion of the panel is sealed and the outer portion is masked.

However, when the masking or sealing process is performed, there is a problem in that the process time required for etching increases and productivity is lowered.

In addition, when sealing, there was a problem that all sealed parts were not uniformly sealed, the liquid crystal panel was damaged during the masking or sealing process, and foreign substances or etchant penetrated into the liquid crystal panel, resulting in a large amount of defective products. There was a problem.

And, when the etchant is sprayed on the liquid crystal panel, since the etchant is sprayed in a state where the liquid crystal panel is vertically positioned, there is also a problem in that the etching deviation for the liquid crystal panel is increased.

The background technology of the present invention is disclosed in Republic of Korea Patent Publication No. 10-1658432 (registered on Jun. 12, 2016, title of the invention: a method of sealing a display panel for etching a display panel and an etching method of a display panel using the same).

The present invention has been devised to solve the above-described problems, and an object of the present invention is to provide an etching apparatus for a liquid crystal panel that prevents an etchant from flowing into a non-etched region of a liquid crystal panel, and an etching method using the same.

Another object of the present invention is to provide an etching apparatus for a liquid crystal panel that allows an etching solution to be evenly sprayed onto an etching region of the liquid crystal panel, and an etching method using the same.

An etching apparatus for a liquid crystal panel according to the present invention includes a protection unit provided in the liquid crystal panel; and a penetration preventing unit for preventing an object from penetrating into the liquid crystal panel.

In addition, the protection part may include: an edge part positioned to surround the non-etched area of the liquid crystal panel; and an adhesion part extending from the edge part and being in close contact with the liquid crystal panel.

In addition, the penetration preventing unit includes a discharge unit for removing the object introduced into the protection unit.

In addition, the discharge unit, a vacuum generating unit for creating a vacuum inside the protection unit; and an object removal unit for removing the object penetrating into the protection unit.

In addition, the vacuum generating unit and the object removing unit is characterized in that the communication with the inside of the protection unit.

In addition, at least one guide hole that penetrates from the lower surface to the inner surface of the contact part and guides the object flowing into the non-etched area to be introduced into the inside of the protection part is formed in the contact part.

In addition, the width of the contact portion is characterized in that formed thicker than the width of the edge portion.

In addition, the discharge part is characterized in that a plurality is provided along the side of the edge part.

In addition, the discharge part is characterized in that made of an acid-resistant material.

In addition, the discharge portion is characterized in that located in the center of the side portion of the edge portion.

In addition, vacuum grease is applied between the contact part and the liquid crystal panel.

In addition, the protection part is characterized in that it is made of a material having acid resistance and softness.

In addition, the liquid crystal panel is positioned in the horizontal direction, the liquid crystal panel is provided with a spraying portion under the liquid crystal panel, characterized in that the object is sprayed from the lower side of the liquid crystal panel to the etching area through the spraying portion.

In addition, it characterized in that it further comprises a fixing member positioned so as to surround the protection portion, pressing the contact portion toward the liquid crystal panel to fix.

An etching method for a liquid crystal panel according to the present invention comprises the steps of: setting a non-etched region in a liquid crystal panel that is not etched and an etched region in which etching is performed; positioning the liquid crystal panel in a horizontal direction; installing a protection unit to surround the non-etched area of the liquid crystal panel; and spraying an etchant to the etched region from the lower side of the liquid crystal panel.

In addition, between the step of installing the protection unit and spraying the etchant, the method further includes discharging the air filled in the protection unit to the outside.

In addition, between the step of discharging the air to the outside and the step of spraying the etchant, the method further includes applying a vacuum grease between the protection unit and the liquid crystal panel.

In addition, between the step of installing the protection unit and spraying the etchant, the method further includes inserting the protection unit into a fixing member to press the protection unit toward the liquid crystal panel.

In addition, the method further includes the step of spraying the etchant again on the opposite surface of the etched region to which the etchant is sprayed by rotating the liquid crystal panel.

In addition, the method further includes discharging the etchant introduced into the protection unit to the outside.

As described above, in the etching apparatus for a liquid crystal panel of the present invention and an etching method using the same, since the etching is performed while the protective part is inserted in the non-etched region of the liquid crystal panel, sealing and masking processes are not required in the etching process of the liquid crystal panel. , there is an effect that the productivity of the curved liquid crystal panel is greatly improved.

In addition, since the etchant flowing into the protective part is discharged to the outside, there is an effect of minimizing the etching of the non-etched area located inside the protective part by the etchant flowing into the protective part.

In addition, since the etching process for the liquid crystal panel is simplified, there is an effect that the yield of the liquid crystal panel is greatly improved.

In addition, since the etchant is sprayed in a state in which the liquid crystal panel is positioned in the horizontal direction, the etchant is uniformly sprayed onto the etched region of the liquid crystal panel without deviation.

In addition, since the width of the edge portion constituting the protection portion and the contact portion are formed differently, there is an effect of minimizing the inflow of the etchant into the inside of the protection portion.

1 is a conceptual diagram illustrating a state in which a liquid crystal panel is etched by an etching apparatus for a liquid crystal panel according to an embodiment of the present invention.
2 is a plan view illustrating a state in which an etching apparatus for a liquid crystal panel according to an embodiment of the present invention is installed on the liquid crystal panel;
3 is a cross-sectional view illustrating a state in which a guide hole is formed in a protective part constituting an etching apparatus for a liquid crystal panel according to an embodiment of the present invention;
4 is a cross-sectional view showing a state in which the width of the protection part constituting the etching apparatus for a liquid crystal panel according to another embodiment of the present invention is formed differently.
5 is a cross-sectional view illustrating a state in which a fixing member is inserted into a protection part constituting an etching apparatus for a liquid crystal panel according to an embodiment of the present invention.
6 is a cross-sectional view illustrating a state in which a liquid crystal panel is etched by an etching apparatus for a liquid crystal panel according to an embodiment of the present invention;
7 is a flowchart illustrating an etching method for a liquid crystal panel according to an embodiment of the present invention.
8 is a flowchart illustrating an etching method for a liquid crystal panel according to another embodiment of the present invention.

Hereinafter, an etching apparatus for a liquid crystal panel and an etching method using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram illustrating a state in which a liquid crystal panel is etched through an etching apparatus for a liquid crystal panel according to an embodiment of the present invention, and FIG. 2 is an etching apparatus for a liquid crystal panel according to an embodiment of the present invention installed on the liquid crystal panel It is a plan view showing a state, and FIG. 3 is a cross-sectional view showing a state in which an induction hole is formed in a protective part constituting an etching apparatus for a liquid crystal panel according to an embodiment of the present invention.

1 to 3 , the etching apparatus 100 for a liquid crystal panel according to an embodiment of the present invention may include a protection unit 110 and a penetration prevention unit 130 .

The protection unit 110 is made of rubber having acid resistance and softness, and may be provided in the liquid crystal panel 200 .

Here, the protection unit 110 may be positioned to surround the non-etched region d1 of the liquid crystal panel 200 .

Accordingly, the penetration target, for example, an etchant is prevented from flowing into the non-etched region d1 surrounded by the protective part 110 of the liquid crystal panel 200 .

The penetration prevention unit 130 prevents an object penetrating into the liquid crystal panel 200 from penetrating into the non-etched region d1 , and a discharge unit 131 for removing the object introduced into the protection unit 110 . may include.

A plurality of discharge parts 131 may be provided along the side surface of the edge part 111 of the protection part 110 to be described later, and may be located at the center of the side surface of the edge part 111 .

Here, the discharge part 131 may be made of an acid-resistant material such as an insulating tube.

In addition, the discharge unit 131 may include a vacuum generating unit 131a and an object removing unit 131b.

The vacuum generating unit 131a can make the inside of the protection unit 110 into a vacuum, and is connected to an external vacuum pump (not shown), so that the air inside the protection unit 110 is removed, the protection unit ( 110) can be adjusted so that the inside of the vacuum is in a vacuum state.

The object removal unit 131b may remove the object penetrating into the protection unit 110 .

Here, the vacuum generating unit 131a and the object removing unit 131b may communicate with the inside of the protection unit 110 , and are disposed in parallel with each other along the edge 111 of the protection unit 110 to be described later. can be

Specifically, the discharge unit 131 may be provided to pass through the protection unit 110 , and air inside the protection unit 110 so that the inside of the protection unit 110 becomes a vacuum through the vacuum generating unit 131a . may be discharged to the outside, or the etchant introduced into the protection unit 110 through the object removal unit 131b may be discharged to the outside.

For example, after the etching solution, that is, the etching solution is sprayed onto the etching region d2 of the liquid crystal panel 200 by the spray unit 150 , the etching solution flows between the gap between the liquid crystal panel 200 and the protection unit 110 . When flowing into the inside of the part 110, the etchant filled in the inside of the protection unit 110 is discharged to the outside of the protection unit 110 through the object removal unit (131b), the protection unit 110 is surrounded by rain The etching region d1 is prevented from being etched through the etchant introduced into the protection unit 110 .

In the present embodiment, although the configuration in which the penetrating target flowing into the gap between the liquid crystal panel 200 and the protection unit 110 is an etchant is exemplified, this is only an example and is not necessarily limited thereto, and the liquid crystal panel 200 ) can be applied to various foreign substances that affect

On the other hand, the vacuum generating unit 131a is connected to a vacuum pump provided on the outside of the protection unit 110, and by discharging the air filled in the inside of the protection unit 110 to the outside, the inside of the protection unit 110 is You can create a vacuum.

And, during the process in which the inside of the protection unit 110 is adjusted to a vacuum state, the contact unit 113 constituting the protection unit 110 is pulled toward the liquid crystal panel 200, so that the contact unit 113 and the liquid crystal panel ( 200) is minimized.

Here, the protection part 110 may include an edge part 111 and a close contact part 113 .

The edge portion 111 may be positioned to surround the non-etched region d1 of the liquid crystal panel 200 , and the discharge portion 131 may be provided to penetrate therethrough.

The close contact portion 113 may be formed to be bent from both inner ends of the edge portion 111 toward the liquid crystal panel 200 to be in close contact with the liquid crystal panel 200 .

Since the adhesion part 113 is in close contact with the liquid crystal panel 200 , the etchant sprayed on the etch region d2 is prevented from flowing into the non-etch region d1 located inside the protection part 110 .

Here, a guide hole 113a may be formed in the close contact portion 113 .

The guide hole 113a penetrates from the lower surface to the inner surface of the contact part 113, and the etchant flowing into the non-etched region d1 is not passed through the non-etched region d1. It can be induced to flow inside.

Since the etchant does not pass through the non-etching region d1 and is guided to the inside of the protection unit 110 through the guide hole 113a, the non-etching region d1 is etched by the etchant flowing into the protection unit 110 . it is prevented

In addition, vacuum grease may be applied between the adhesion part 113 and the liquid crystal panel 200 .

The vacuum grease is applied between the adhesion part 113 and the liquid crystal panel 200 to fill the gap between the adhesion part 113 and the liquid crystal panel 200 , so that the etchant is applied between the adhesion part 113 and the liquid crystal panel 200 . ) and is prevented from flowing into the non-etched region d1 located inside the protection unit 110 .

Here, the liquid crystal panel 200 may be positioned in a horizontal direction, and the spray unit 150 may be provided under the liquid crystal panel 200 .

Although the present embodiment exemplifies a configuration in which the liquid crystal panel 200 is positioned in a horizontal direction, this is only an example and is not necessarily limited thereto, and the liquid crystal panel 200 may be positioned in various directions.

The spraying unit 150 may spray an etchant toward the liquid crystal panel 200 in a state located below the liquid crystal panel 200 to etch the etching region d2 .

In the conventional case, since the etchant is sprayed from the side in a state in which the liquid crystal panel 200 is positioned vertically, regions having different etched degrees are often generated in the etched region d2, but the present invention provides for the liquid crystal panel After positioning 200 in the horizontal direction, the etchant is sprayed through the injection unit 150 from the lower side, so that the etchant is uniformly sprayed onto the etching region d2 of the liquid crystal panel 200 .

Meanwhile, FIG. 4 is a cross-sectional view illustrating a state in which the width of the protection part constituting the etching apparatus for a liquid crystal panel according to another embodiment of the present invention is formed differently.

As shown in FIG. 4 , the etching apparatus 100 for a liquid crystal panel according to another embodiment of the present invention may include a protection unit 310 and a penetration prevention unit 130 .

The protection unit 310 may be provided in the liquid crystal panel 200 , and the penetration preventing unit 130 prevents an object penetrating into the liquid crystal panel 200 from penetrating into the non-etched region d1 .

Here, the protection unit 310 may be positioned to surround the non-etched region d1 of the liquid crystal panel 200 , and the penetration prevention unit 130 removes the object introduced into the protection unit 110 . It may include a discharge unit 131 that does.

In addition, the discharge unit 131 may be formed of an insulating tube, and may include the vacuum generating unit 131a and the object removing unit 131b shown in FIG. 3 .

Meanwhile, the protection part 310 may include an edge part 311 and a contact part 313 .

The edge portion 311 may be positioned to surround the non-etched region d1 of the liquid crystal panel 200 .

The contact part 313 may extend from the edge 311 and be positioned to be in close contact with the liquid crystal panel 200 .

Here, a guide hole 113a may be formed in the contact part 313 , and the guide hole 113a may be formed to penetrate from the lower surface of the contact part 313 to the inner surface.

In particular, the width W1 of the contact portion 313 may be thicker than the width W2 of the edge portion 311 .

In the present invention, by forming the width W1 of the contact portion 313 thicker than the width W2 of the edge portion 311 , the etchant is sprayed onto the etching region d2 of the liquid crystal panel 200 , and then the protection part When it flows into the gap between the adhesion part 313 constituting the 310 and the liquid crystal panel 200 , the distance between the adhesion part to which the etchant moves is increased, and finally flows into the inside of the protection part 310 . The etching solution is minimized.

Meanwhile, FIG. 5 is a cross-sectional view illustrating a state in which a fixing member is fitted into a protection part constituting an etching apparatus for a liquid crystal panel according to an embodiment of the present invention.

As shown in FIG. 5 , in the etching apparatus 100 for a liquid crystal panel according to an embodiment of the present invention, a fixing member 400 may be further provided in the protection unit 110 .

The fixing member 400 presses (P) the contact portion 113 constituting the protection unit 110 toward the liquid crystal panel 200 in a state where it is positioned so as to surround the protection unit 110 , the contact portion 113 . The gap between the and the liquid crystal panel 200 is minimized, thereby preventing the etchant from flowing into the protection unit 110 .

Hereinafter, an etching method for a liquid crystal panel according to an embodiment of the present invention will be described in detail with reference to FIG. 7 .

First, in the liquid crystal panel 200 , a non-etched region d1 that is not etched and an etched region d2 that is etched are set ( S101 ).

Thereafter, the liquid crystal panel 200 is positioned in the first direction ( S103 ), and then the protection unit 110 is installed to surround the non-etched region d1 of the liquid crystal panel 200 ( S105 ).

Although the present embodiment exemplifies a configuration in which the liquid crystal panel 200 is positioned in a horizontal direction, this is only an example and is not necessarily limited thereto, and the liquid crystal panel 200 may be positioned in various directions.

Then, the air filled in the inside of the protection unit 110 is discharged to the outside so that the protection unit 110 is in close contact with the liquid crystal panel 200 ( S107 ), and then between the protection unit 110 and the liquid crystal panel 200 . Apply vacuum grease to (S109).

Thereafter, the etchant is sprayed on the etch region d2 through the injection unit 150 from the lower side of the liquid crystal panel 200 (S111), and the liquid crystal panel 200 is rotated to apply the etchant to the opposite surface of the etch region d2. It is sprayed again (S113).

Meanwhile, referring to FIG. 8 , an etching method for a liquid crystal panel according to another embodiment of the present invention will be described in detail. In the liquid crystal panel 200 , the non-etched region d1 and the etched region are etched. (d2) is set (S201), the liquid crystal panel 200 is positioned in the horizontal direction (S203), and the protection unit 110 is installed to surround the non-etched region d1 of the liquid crystal panel 200 ( S205)

Then, after discharging the air filled in the inside of the protection unit 110 to the outside (S207), after pressing the protection unit 110 with the fixing member 400 (S209), the etching region of the liquid crystal panel 200 The etching solution is sprayed at (d2) (S211), and the liquid crystal panel 200 is rotated to spray the etching solution again on the opposite surface of the etching region d2 (S213).

According to the present invention configured and operated as described above, since the etching is performed in a state in which the protection part 110 is inserted into the non-etched region d1 of the liquid crystal panel 200 , sealing is performed in the etching process of the liquid crystal panel 200 . Since no over-masking process is required, the productivity of the curved liquid crystal panel 200 is greatly improved.

In addition, since the etchant introduced into the protection unit 110 through the penetration prevention unit 130 is discharged to the outside, the non-etched region d2 located inside the protection unit 110 is introduced into the protection unit 110 . It is prevented from being etched by the etchant.

In addition, since the etching process for the liquid crystal panel 200 is simplified, the yield of the liquid crystal panel 200 is greatly improved.

In addition, since the etchant is sprayed from the lower side of the liquid crystal panel 200 in a state in which the liquid crystal panel 200 is positioned in the horizontal direction, the etchant is uniformly sprayed onto the etching region of the liquid crystal panel 200 without deviation.

In addition, since the vacuum grease is applied to the gap between the liquid crystal panel 200 and the protective part 110, the gap between the liquid crystal panel 200 and the protective part 110 is filled, so that the etchant passes between the gaps to the non-etched area ( d1) is prevented.

In addition, since the protection unit 110 is pressed toward the liquid crystal panel 200 through the fixing member 400 , the gap between the liquid crystal panel 200 and the protection unit 110 is minimized, and through this, the liquid crystal panel 200 ) and the inflow of the etchant between the gaps of the protection unit 110 is prevented.

In addition, since the width of the edge portion 311 and the contact portion 313 constituting the protection unit 310 is formed to be different, the adhesion portion between the adhesion portion 313 and the liquid crystal panel 200 becomes longer, passing the adhesion portion The etchant flowing into the protection part 310 is minimized.

Although a preferred embodiment of the present invention has been described above, it is clear that the present invention can use various changes, modifications, and equivalents, and can be equally applied by appropriately modifying the above embodiments. Accordingly, the above description is not intended to limit the scope of the present invention, which is defined by the limits of the following claims.

100: device 110, 310: protection unit
111, 311: edge portion 113, 313: contact portion
113a, 313a: guide hole 130: penetration prevention part
131: discharge unit 131a: vacuum generating unit
131b: object removal unit 200: liquid crystal panel
d1: non-etched region d2: etched region
150: injection part P: pressure direction

Claims (20)

a protection unit provided in the non-etched region to prevent an object sprayed onto the etched region of the liquid crystal panel from flowing into the non-etched region; and
Including; and a penetration prevention unit that forms a flow path communicating with the inside of the protection unit so that the air or the object inside the protection unit can be discharged to the outside of the protection unit;
The protection unit,
an edge portion positioned to surround the non-etched region; and
and a close contact portion extending from the edge portion to the liquid crystal panel side and in close contact with the liquid crystal panel;
The penetration prevention unit,
and a vacuum generating unit that forms a flow path for discharging the air inside the protection unit, is connected to a vacuum pump, and pulls the contact unit toward the liquid crystal panel by discharging the air inside the protection unit. Etching device for liquid crystal panel.
delete delete According to claim 1,
The penetration prevention unit,
An etching apparatus for a liquid crystal panel further comprising a; object removal unit for removing the object that has penetrated into the protection unit.
5. The method of claim 4,
The etching apparatus for a liquid crystal panel, characterized in that the object removal unit communicates with the inside of the protection unit.
According to claim 1,
Etching apparatus for a liquid crystal panel, characterized in that the at least one guide hole that penetrates from the lower surface to the inner surface and guides the object flowing into the non-etched area to flow into the inside of the protection part; is formed in the contact part.
According to claim 1,
The etching apparatus for a liquid crystal panel, characterized in that the width of the contact portion is formed to be thicker than the width of the edge portion.
According to claim 1,
The etching apparatus for a liquid crystal panel, characterized in that a plurality of the penetration preventing portion is provided along the side of the edge portion.
According to claim 1,
The liquid crystal panel etching device, characterized in that the penetration preventing portion made of an acid-resistant material.
9. The method of claim 8,
The etching apparatus for a liquid crystal panel, characterized in that the penetration preventing portion is located in the center of the side of the edge portion.
According to claim 1,
An etching apparatus for a liquid crystal panel, characterized in that vacuum grease is applied between the contact part and the liquid crystal panel.
According to claim 1,
The protection part is an etching apparatus for a liquid crystal panel, characterized in that made of a material having acid resistance and softness.
According to claim 1,
The liquid crystal panel is positioned in a horizontal direction,
A spraying part is provided on the lower side of the liquid crystal panel,
The etching apparatus for a liquid crystal panel, characterized in that the object is injected into the etching area from the lower side of the liquid crystal panel through the spraying unit.
According to claim 1,
The liquid crystal panel etching apparatus according to claim 1, further comprising a fixing member positioned to surround the protection part and fixing the contact part by pressing it toward the liquid crystal panel.
setting a non-etched region in which etching is not performed and an etched region in which etching is performed in the liquid crystal panel;
installing a protection unit to surround the non-etched area;
discharging the air inside the protection unit to the outside through a penetration preventing unit that forms a flow path communicating with the inside of the protection unit; and
Including; spraying an etchant to the etched region from the lower side of the liquid crystal panel,
The protection unit,
an edge portion positioned to surround the non-etched region; and
and a close contact portion extending from the edge portion to the liquid crystal panel side and in close contact with the liquid crystal panel;
The penetration prevention unit,
Including; and a vacuum generating unit that forms a flow path through which the air inside the protection unit can be discharged, and is connected to a vacuum pump.
The step of discharging the air inside the protection unit to the outside is,
Etching for liquid crystal panel, characterized in that by discharging the air inside the protection unit through the vacuum generating unit, pulling the contact part toward the liquid crystal panel, and preventing the etchant sprayed to the etching area from flowing into the non-etching area Way.
delete 16. The method of claim 15,
Between the step of discharging the air to the outside and the step of spraying the etchant,
The etching method for a liquid crystal panel further comprising; applying a vacuum grease between the protection part and the liquid crystal panel.
16. The method of claim 15,
Between the step of installing the protection part and the step of spraying the etchant,
The etching method for a liquid crystal panel, characterized in that it further comprises the step of inserting the protective part into a fixing member to press the protective part toward the liquid crystal panel.
16. The method of claim 15,
The etching method for a liquid crystal panel, characterized in that it further comprises the step of rotating the liquid crystal panel and spraying the etching solution again on the opposite surface of the etching region to which the etching solution is sprayed.
20. The method of claim 19,
The etching method for a liquid crystal panel, characterized in that it further comprises the step of discharging the etchant introduced into the protection unit to the outside.

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