KR20080046756A - Painting spray gun - Google Patents
Painting spray gun Download PDFInfo
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- KR20080046756A KR20080046756A KR1020060116118A KR20060116118A KR20080046756A KR 20080046756 A KR20080046756 A KR 20080046756A KR 1020060116118 A KR1020060116118 A KR 1020060116118A KR 20060116118 A KR20060116118 A KR 20060116118A KR 20080046756 A KR20080046756 A KR 20080046756A
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- spray gun
- measuring sensor
- distance
- microcomputer
- distance measuring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
- B05B12/124—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to distance between spray apparatus and target
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/004—Arrangements for controlling delivery; Arrangements for controlling the spray area comprising sensors for monitoring the delivery, e.g. by displaying the sensed value or generating an alarm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
- B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/084—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to condition of liquid or other fluent material already sprayed on the target, e.g. coating thickness, weight or pattern
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Spray Control Apparatus (AREA)
Abstract
Description
도 1은 본 발명에 따른 도장 스프레이건의 구성을 설명한 개략도,1 is a schematic view illustrating the construction of a spray spray gun according to the present invention;
도 2는 본 발명에 따른 도장 스프레이건을 이루는 주요 구성요소의 계통도,Figure 2 is a schematic diagram of the main components of the paint spray gun according to the present invention,
도 3은 본 발명 도장 스프레이건의 작용을 설명한 순서도이다.Figure 3 is a flow chart illustrating the operation of the present invention spray gun.
<도면의 주요 부분에 대한 부호의 간단한 설명><Brief description of symbols for the main parts of the drawings>
1; 스프레이건 3; 거리측정센서One; Spray gun 3; Distance measuring sensor
5; 기울기측정센서 7; 마이컴5; Tilt measuring sensor 7; Micom
9; 발광다이오드 11; 음향장치9;
13; 에어터빈발전기 15; 축전지13;
본 발명은 도장 스프레이건에 관한 것으로서, 보다 상세하게는 피도물에 대한 도장 스프레이건의 위치 및 자세의 적정한 확보로 도장품질을 향상시키는 기술에 관한 것이다.The present invention relates to a coating spray gun, and more particularly to a technique for improving the coating quality by appropriately securing the position and posture of the coating spray gun relative to the coating object.
대량생산 체제에서 스프레이건을 사용하여 도장작업을 하는 목적은 경제적이고 신속한 방법으로 최소의 노력을 들여 최고의 품질을 얻기 위한 것이다.The purpose of painting with spray guns in mass production is to achieve the highest quality with minimal effort in an economical and quick way.
공기를 이용하는 스프레이건은 압축공기로 도료를 무화시키면서 분사하여 피도물의 표면에 고르게 도료가 도장되도록 하는 것으로서, 피도물에 대한 스프레이건의 위치와 자세는 도장품질에 직접적인 영향을 주는 요소이다.The spray gun using air is sprayed while atomizing the paint with compressed air so that the paint is evenly coated on the surface of the workpiece. The position and attitude of the spray gun with respect to the workpiece is a factor directly affecting the coating quality.
특히, 로보트와 같은 자동화 기계가 아니라 작업자가 스프레이건으로 도장작업을 하는 경우에는, 스프레이건과 피도물과의 적정한 거리를 일정하게 유지하는 것이 사실상 매우 힘들다.In particular, when an operator paints with a spray gun rather than an automated machine such as a robot, it is practically very difficult to keep a proper distance between the spray gun and the workpiece.
피도물에 대하여 스프레이건이 너무 멀면 피도물에 도달하는 도료가 적어 문제가 발생하고, 너무 가까우면 도료가 피도물의 표면에 뭉치거나 흘러내리게 되는 문제가 발생한다.If the spray gun is too far with respect to the workpiece, there will be a problem due to the small amount of paint that reaches the workpiece. If the spray gun is too close, the paint may clump or drip on the surface of the workpiece.
또한, 스프레이건과 피도물의 각도는 스프레이건에서 도료가 분사되는 방향과 피도물의 각도가 대략 90도 내외를 유지하여야 하는데, 이것이 일정하게 유지되지 않으면, 역시 피도물 표면에 도료가 부족하거나 도료가 남아 흘러내리는 등 도장품질이 급격히 저하되는 원인이 된다.In addition, the angle of the spray gun and the coating should be maintained at about 90 degrees in the direction of the spraying of the spray gun and the coating. If this is not kept constant, the paint surface may have insufficient paint or may be left on the surface of the coating. It may cause a sudden drop in the coating quality.
그러나, 작업자는 작업대상인 피도물에 도장이 되는 상태 등에 주로 주의를 기울이게 되고 스프레이건과 피도물 사이의 거리나 그 상대적인 각도 등에 대해서는 주의를 소홀히 하기 쉽다. However, the operator pays attention mainly to the state in which the object to be painted is painted, and it is easy to neglect the distance or the relative angle between the spray gun and the object.
본 발명은 상기한 바와 같은 문제점을 해결하기 위하여 안출된 것으로서, 작업자가 스프레이건으로 도장작업을 할 때, 피도물과 스프레이건 사이의 적정한 거리를 자동적으로 유지할 수 있도록 해주고, 스프레이건의 각도도 적당하게 유지 할 수 있도록 해주어 도장품질을 향상시키고 도장 작업성을 개선할 수 있도록 한 도장 스프레이건을 제공함에 그 목적이 있다.The present invention has been made in order to solve the problems described above, when the operator is painting with a spray gun, it is possible to automatically maintain the proper distance between the workpiece and the spray gun, and to maintain the proper angle of the spray gun Its purpose is to provide a coating spray gun that enables to improve the painting quality and improve painting workability.
상기한 바와 같은 목적을 달성하기 위한 본 발명 도장 스프레이건은Coating spray gun of the present invention for achieving the object as described above
스프레이건에 장착되어 스프레이건과 피도물 사이의 거리를 측정하는 거리측정센서와;A distance measuring sensor mounted on the spray gun and measuring a distance between the spray gun and the workpiece;
상기 스프레이건에 장착되어 스프레이건의 기울기를 측정하는 기울기측정센서와;An inclination sensor mounted on the spray gun and measuring an inclination of the spray gun;
상기 스프레이건에 장착되어 작업자에게 시청각적 신호를 제공하는 시청각경보수단과;Audiovisual alarm means mounted to the spray gun to provide an audiovisual signal to an operator;
상기 거리측정센서와 기울기측정센서의 신호를 받아 상기 시청각경보수단을 구동하는 마이컴과;A microcomputer that receives the signals of the distance measuring sensor and the tilt measuring sensor and drives the audiovisual alarming means;
상기 마이컴과, 거리측정센서, 기울기측정센서 및 시청각경보수단에 전기를 공급하는 에너지공급수단;Energy supply means for supplying electricity to the microcomputer, the distance measuring sensor, the tilt measuring sensor, and the audiovisual alarm means;
을 포함하여 구성된 것을 특징으로 한다.Characterized in that configured to include.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.
도 1과 도 2를 참조하면, 본 발명 실시예는 스프레이건(1)에 장착되어 스프레이건(1)과 피도물 사이의 거리를 측정하는 거리측정센서(3)와; 상기 스프레이건(1)에 장착되어 스프레이건(1)의 기울기를 측정하는 기울기측정센서(5) 와; 상기 스프레이건(1)에 장착되어 작업자에게 시청각적 신호를 제공하는 시청각경보수단과; 상기 거리측정센서(3)와 기울기측정센서(5)의 신호를 받아 상기 시청각경보수단을 구동하는 마이컴(7)과; 상기 마이컴(7)과, 거리측정센서(3), 기울기측정센서(5) 및 시청각경보수단에 전기를 공급하는 에너지공급수단을 포함하여 구성된다.1 and 2, an embodiment of the present invention includes a distance measuring sensor 3 mounted on a spray gun 1 to measure a distance between the spray gun 1 and a workpiece; An inclination sensor (5) mounted to the spray gun (1) to measure the inclination of the spray gun (1); An audiovisual alarm means mounted to the spray gun 1 to provide an audiovisual signal to an operator; A microcomputer 7 which receives the signals of the distance measuring sensor 3 and the tilt measuring sensor 5 and drives the audiovisual alarming means; And the energy supply means for supplying electricity to the microcomputer 7, the distance measuring sensor 3, the tilt measuring sensor 5, and the audiovisual alarming means.
상기 시청각경보수단은 발광다이오드(9)와 음향장치(11)로 구성하였는데, 특히 본 실시예에서는 상기 거리측정센서(3)에 의한 신호에 의해서는 상기 발광다이오드(9)를 구동하고, 상기 기울기측정센서(5)에 의한 신호에 의해서는 상기 음향장치(11)를 구동하도록 하였다.The audio-visual alarm means comprises a light emitting diode 9 and an
보다 구체적으로는 도 3에 도시된 바와 같이 거리측정센서(3)에 의해 기준거리를 초과한 경우에는 적색 발광다이오드를 점등 또는 점멸시키고, 기준거리에 미달한 경우에는 흰색 발광다이오드를 점등 또는 점멸시키며, 기준각도를 초과한 경우와 기준각도에 미달한 경우 각각 다른 음향을 상기 음향장치(11)에서 발생시키도록 하였다.More specifically, as shown in FIG. 3, when the reference distance is exceeded by the distance measuring sensor 3, the red light emitting diode is turned on or flashes, and when the distance is less than the reference distance, the white light emitting diode is turned on or flashing. In the case where the reference angle is exceeded and the reference angle is less than the reference angle, different sounds are generated by the
여기서, 상기 기준거리라 함은 스프레이건(1)과 피도물 사이의 적정한 거리를 말하며, 상기 기준각도는 피도물에 대한 스프레이건(1)의 도료분출방향의 적정한 각도를 말한다.Here, the reference distance refers to an appropriate distance between the spray gun 1 and the coating object, and the reference angle refers to an appropriate angle of the paint ejection direction of the spray gun 1 with respect to the coating object.
상기 에너지공급수단은 상기 스프레이건(1)이 도료를 분사하기 위해 공급받는 압축공기의 힘으로 작동하도록 상기 스프레이건(1)에 내장된 에어터빈발전기(13)와, 상기 에어터빈발전기(13)에서 발전된 전기를 저장하고 상기 마이컴(7)과 거리측정센서(3), 기울기측정센서(5) 및 시청각경보수단에 전기를 공급하는 축전지(15)로 구성하여, 별도로 건전지 등을 교체할 필요가 없도록 하였다.The energy supply means includes an air turbine generator (13) built in the spray gun (1) and the air turbine generator (13) so that the spray gun (1) is operated by the force of compressed air supplied to spray the paint. It consists of a battery (15) for storing the electricity generated in the power supply to the microcomputer (7), the distance measuring sensor (3), the tilt measuring sensor (5) and the audio-visual alarm means, it is necessary to replace the battery separately It was not.
상기와 같이 구성된 본 발명 스프레이건의 작용을 살펴보면 다음과 같다.Looking at the action of the spray gun of the present invention configured as described above are as follows.
작업자가 스프레이건(1)을 작동시키면, 압축공기가 스프레이건(1)으로 공급되면서 다른 한편으로 공급되는 도료를 무화시켜 분사함으로써, 피도물에 도료가 도장되도록 한다.When the operator operates the spray gun 1, the compressed air is supplied to the spray gun 1 while atomizing and spraying the paint supplied to the other side, thereby allowing the paint to be painted on the workpiece.
이때, 피도물과 스프레이건(1) 사이의 거리는 상기 거리측정센서(3)가 지속적으로 측정하여, 기준거리의 범위 내에 스프레이건(1)이 위치하는지를 상기 마이컴(7)으로 판단하게 된다.At this time, the distance between the workpiece and the spray gun 1 is continuously measured by the distance measuring sensor 3, it is determined by the microcomputer 7 whether the spray gun 1 is located within the range of the reference distance.
만약, 스프레이건(1)이 작업도중 피도물에 너무 멀리 떨어지게 되면, 상기 마이컴(7)은 상기 적색 발광다이오드를 구동하여 작업자에게 알리게 되며, 스프레이건(1)이 피도물에 너무 가깝게 접근하게 되면, 상기 흰색 발광다이오드를 구동하여 작업자에게 이를 알려주게 된다.If the spray gun 1 is too far away from the workpiece during operation, the microcomputer 7 notifies the operator by driving the red light emitting diode, and if the spray gun 1 approaches too close to the workpiece, The white light emitting diode is driven to inform the operator.
물론, 이와 같이 발광다이오드(9)를 구동하는 것만으로 작업자의 주의를 환기시키기 어려운 경우에는 별도의 음향을 동시에 발생시키거나, 스프레이건(1) 내부에 진동장치를 구비하여 작업자가 손으로 느낄 수 있도록 구현하는 것도 가능하다.Of course, when it is difficult to call the operator's attention only by driving the light emitting diodes 9 as described above, a separate sound may be generated at the same time or a vibration device may be provided inside the spray gun 1 so that the worker can feel it with his hands. It can also be implemented.
한편, 스프레이건(1)의 각도도 도장품질에 크게 영향을 주는 바, 상기 기울기측정센서(5)는 상기 스프레이건(1) 자체의 기울기를 계속적으로 측정하여, 그 정보를 상기 마이컴(7)에 공급하고, 상기 마이컴(7)은 스프레이건(1)이 기준각도보다 초과하여 기울어지면 특정의 A음향을 발생시키고, 스프레이건(1)이 기준각도보다 미달하게 기울어지면 또 다른 특정의 B음향을 발생시켜서 작업자가 스프레이건(1)의 자세를 올바로 할 수 있도록 한다.On the other hand, the angle of the spray gun (1) also greatly affects the coating quality, the inclination measuring sensor (5) continuously measures the inclination of the spray gun (1) itself, the information of the microcomputer (7) And the microcomputer 7 generates a specific A sound when the spray gun 1 is inclined above the reference angle, and another specific B sound when the spray gun 1 is inclined below the reference angle. To allow the operator to properly position the spray gun (1).
물론, 이 경우에도 시각적인 신호를 별도의 램프 등으로 함께 작업자에게 제공하도록 할 수 있으며, 진동 등과 같은 촉각적인 신호를 함께 제공하는 것도 가능하다.Of course, even in this case, it is possible to provide a visual signal to the worker with a separate lamp, etc., it is also possible to provide a tactile signal such as vibration.
상기한 바와 같이 작업자가 무의식 중에 스프레이건(1)의 자세나 위치를 부적합한 상태로 하면, 본 발명은 자동적으로 이를 감지하여 작업자의 주의를 환기시킬 수 있도록 함으로써, 보다 안정적인 도장작업으로 도장품질을 크게 향상시킬 수 있다.As described above, when the worker unconsciously makes the posture or position of the spray gun 1 unsuitable, the present invention automatically detects it and allows the worker to be alerted, thereby greatly improving the painting quality by more stable painting work. Can be improved.
이상과 같이 본 발명에 의하면, 작업자가 스프레이건으로 도장작업을 할 때, 피도물과 스프레이건 사이의 적정한 거리를 자동적으로 유지할 수 있도록 해주고, 스프레이건의 각도도 적당하게 유지할 수 있도록 해주어 도장품질을 향상시키고 도장 작업성을 개선할 수 있도록 한다.As described above, according to the present invention, when the operator works with the spray gun, it is possible to automatically maintain the proper distance between the workpiece and the spray gun, and also to maintain the spray gun angle properly, thereby improving the coating quality and painting. Improve workability
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060116118A KR20080046756A (en) | 2006-11-23 | 2006-11-23 | Painting spray gun |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060116118A KR20080046756A (en) | 2006-11-23 | 2006-11-23 | Painting spray gun |
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| KR20080046756A true KR20080046756A (en) | 2008-05-28 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014055419A1 (en) * | 2012-10-01 | 2014-04-10 | Graco Minnesota Inc. | Alternator indicator for electrostatic spray gun |
| WO2020150469A1 (en) * | 2019-01-18 | 2020-07-23 | Wagner Spray Tech Corporation | Smart control of a spray system |
| WO2021050119A1 (en) * | 2019-09-10 | 2021-03-18 | Wagner Spray Tech Corporation | Gesture control of a fluid application system |
| KR102309762B1 (en) * | 2020-11-30 | 2021-10-07 | 한양대학교 에리카산학협력단 | Metal thermal spray gun for shielding electromagnetic wave |
| US11163323B2 (en) | 2013-02-11 | 2021-11-02 | Graco Minnesota Inc. | Paint sprayer distributed control and output volume monitoring architectures |
| US11750954B2 (en) | 2013-02-11 | 2023-09-05 | Graco Minnesota Inc. | Remote monitoring for fluid applicator system |
| US11815919B2 (en) | 2013-02-11 | 2023-11-14 | Graco Minnesota Inc. | Operator interface device and distributed control for fluid dispensing systems |
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2006
- 2006-11-23 KR KR1020060116118A patent/KR20080046756A/en not_active Application Discontinuation
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014055419A1 (en) * | 2012-10-01 | 2014-04-10 | Graco Minnesota Inc. | Alternator indicator for electrostatic spray gun |
| US10046343B2 (en) | 2012-10-01 | 2018-08-14 | Graco Minnesota Inc. | Alternator indicator for electrostatic spray gun |
| US11934211B2 (en) | 2013-02-11 | 2024-03-19 | Graco Minnesota Inc. | Paint sprayer distributed control and output volume monitoring architectures |
| US11815919B2 (en) | 2013-02-11 | 2023-11-14 | Graco Minnesota Inc. | Operator interface device and distributed control for fluid dispensing systems |
| US11934210B2 (en) | 2013-02-11 | 2024-03-19 | Graco Minnesota Inc. | Paint sprayer distributed control and output volume monitoring architectures |
| US11163323B2 (en) | 2013-02-11 | 2021-11-02 | Graco Minnesota Inc. | Paint sprayer distributed control and output volume monitoring architectures |
| US11226643B2 (en) | 2013-02-11 | 2022-01-18 | Graco Minnesota Inc. | Paint sprayer distributed control and output volume monitoring architectures |
| US11385662B2 (en) | 2013-02-11 | 2022-07-12 | Graco Minnesota Inc. | Paint sprayer distributed control and output volume monitoring architectures |
| US11385663B2 (en) | 2013-02-11 | 2022-07-12 | Graco Minnesota Inc. | Paint sprayer distributed control and output volume monitoring architectures |
| US11934212B2 (en) | 2013-02-11 | 2024-03-19 | Graco Minnesota Inc. | Paint sprayer distributed control and output volume monitoring architectures |
| US11750954B2 (en) | 2013-02-11 | 2023-09-05 | Graco Minnesota Inc. | Remote monitoring for fluid applicator system |
| WO2020150469A1 (en) * | 2019-01-18 | 2020-07-23 | Wagner Spray Tech Corporation | Smart control of a spray system |
| US11938497B2 (en) | 2019-01-18 | 2024-03-26 | Wagner Spray Tech Corporation | Smart control of a spray system |
| WO2021050119A1 (en) * | 2019-09-10 | 2021-03-18 | Wagner Spray Tech Corporation | Gesture control of a fluid application system |
| US11513602B2 (en) | 2019-09-10 | 2022-11-29 | Wagner Spray Tech Corporation | Gesture control of a fluid application system |
| US11947730B2 (en) | 2019-09-10 | 2024-04-02 | Wagner Spray Tech Corporation | Gesture control of a fluid application system |
| KR102309762B1 (en) * | 2020-11-30 | 2021-10-07 | 한양대학교 에리카산학협력단 | Metal thermal spray gun for shielding electromagnetic wave |
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