WO2023022418A1 - Acoustic camera having waterproof means - Google Patents

Acoustic camera having waterproof means Download PDF

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Publication number
WO2023022418A1
WO2023022418A1 PCT/KR2022/011725 KR2022011725W WO2023022418A1 WO 2023022418 A1 WO2023022418 A1 WO 2023022418A1 KR 2022011725 W KR2022011725 W KR 2022011725W WO 2023022418 A1 WO2023022418 A1 WO 2023022418A1
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WO
WIPO (PCT)
Prior art keywords
sound wave
substrate
sound
waterproof
front protection
Prior art date
Application number
PCT/KR2022/011725
Other languages
French (fr)
Korean (ko)
Inventor
김영기
김인권
이광현
오창준
정욱진
Original Assignee
(주)에스엠인스트루먼트
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from KR1020210108416A external-priority patent/KR102566117B1/en
Priority claimed from KR1020210134561A external-priority patent/KR20230051746A/en
Application filed by (주)에스엠인스트루먼트 filed Critical (주)에스엠인스트루먼트
Publication of WO2023022418A1 publication Critical patent/WO2023022418A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/08—Waterproof bodies or housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B29/00—Combinations of cameras, projectors or photographic printing apparatus with non-photographic non-optical apparatus, e.g. clocks or weapons; Cameras having the shape of other objects
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B31/00—Associated working of cameras or projectors with sound-recording or sound-reproducing means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Definitions

  • the present invention relates to an acoustic camera equipped with waterproofing means.
  • Registered Patent No. 10-1213540 is a sound sensing device configured to be mounted on a circuit board (Print Circuit Board, 20) and transmitting a signal related to detected sound to a data collection unit;
  • a data collection unit that is connected to the sound sensing device, samples an analog signal related to sound transmitted from the sound sensing device, converts it into a digital signal related to sound, and transmits the analog signal related to sound to a central processing unit, and is connected to the data collection unit,
  • a central processing unit that calculates a noise level related to each MEMS microphone based on the digital signal related to the sound transmitted from the data collection unit, and is connected to the central processing unit, and the noise level calculated by the central processing unit is associated with each MEMS microphone.
  • Post an acoustic camera using a MEMS microphone array characterized in that configured to include a display unit for displaying.
  • a display unit for displaying.
  • Registered Patent No. 10-1471299 (patent holder: SM Instruments Co., Ltd., Hyundai Motor Co., Ltd.) is a front body in which sound sensing parts of MEMS microphones are disposed facing forward; the MEMS microphones in which sound sensing units are exposed to the front body while being fixed to a substrate; a substrate on which the MEMS microphones are mounted; an image capturing unit in which a photographing lens is exposed through the lens hole of the front body; a rear body covering the rear side of the substrate and the rear side of the image capture unit in a state where the substrate is positioned on the rear side of the front body; Disclosed is a movable sound camera comprising a structure, wherein the front body includes a front plate forming a plane, and the front plate and the substrate are disposed in parallel.
  • An object of the present invention is to provide an acoustic camera having excellent sound sensing performance and having a waterproof function so that it can be installed or used in a mobile environment, not indoors.
  • An acoustic camera equipped with a waterproof means of the present invention includes a front protection unit 10 having a plurality of sound wave inlet holes 20 for inducing sound waves or ultrasonic waves to reach the MEMS microphone 20;
  • the MEMS microphones 30 that detect sound waves introduced through the sound wave inlet grooves 11 of the front protection unit 10 while being fixed to a substrate 30; a substrate 40 on which the MEMS microphones 20 are mounted;
  • an image capturing unit 50 for capturing a scene toward which the front protection unit 10 is facing using a photographing lens 41; a rear housing 60 covering the rear of the front protection unit 10; It is characterized in that it is configured to include; a waterproofing unit 70 that blocks water from reaching the MEMS microphone 30 or the substrate 40 through the sound wave inlet hole 20.
  • the waterproof means portion 60 is a sound wave permeable waterproof membrane ( 61).
  • the position of the sound wave permeable waterproof membrane 71 in the front-back direction (FIG. 4) is the front of the front protection part 10, the midpoint of the sound wave inlet hole 20 (the point between the front and rear ends of the sound wave inlet hole), or Preferably, it is provided between the rear surface of the front protection unit 10 and the front surface of the substrate 40 . More preferably, in the sound camera equipped with the waterproof means of the present invention, the waterproof means part 70 is provided between the rear surface of the front protection part 10 and the front surface of the substrate 40 .
  • the width or diameter of the front side (exposure side) of the sound wave inlet hole 20 is larger than that of the rear side (substrate side), and the rear side (substrate side) ) to the front side (exposed side), it is preferable to be composed of an expandable shape in which the cross-sectional area continuously widens.
  • an acoustic camera having excellent sound sensing performance and having a waterproof function is provided so that it can be installed or used in a mobile environment instead of indoors.
  • FIG. 1 is an overall configuration diagram of a sound camera equipped with a waterproofing means according to an embodiment of the present invention.
  • Figure 2a is a front body configuration diagram according to the first embodiment (sound wave inlet hole + waterproofing means) of the present invention
  • Figure 2b is a front body according to the second embodiment (sound wave inlet hole + counterbore + waterproofing means) of the present invention Diagram.
  • Figure 3 (a, b) is a detailed view of the front body according to Figure 2 (a, b) the first and second embodiments of the present invention.
  • FIG 4 is a detailed cross-sectional view of the waterproofing means according to an embodiment of the present invention. (a: before being pressed, b: after being pressed by the substrate)
  • Figure 5 is a front body, waterproof means and substrate coupling (cross-sectional view, cross-sectional detail view) according to the first embodiment of the present invention (sound wave inlet hole + waterproof means).
  • Figure 6 is a front body, waterproof means and substrate coupling (cross-sectional view, cross-sectional detail view) according to the second embodiment (sound wave inlet hole + counter bore + waterproof means) of the present invention.
  • Figure 7 is a front body, waterproof means and substrate coupling (a: before pressing, b: by the substrate) according to the second embodiment (sound wave inlet hole + counter bore + waterproof means) of the present invention after being pressed).
  • FIG 8 (a, b, c, d) is a configuration diagram of the back of the front body having a counter bore according to the second embodiment of the present invention (a: before mounting the waterproofing means, b, c, d: after mounting the waterproofing means) before board mounting).
  • Figure 9 is a configuration diagram of the front body and substrate assembly according to an embodiment of the present invention.
  • FIG. 10 is an explanatory diagram of an acoustic performance test method for an acoustic camera of the present invention.
  • Figure 11 (a, b, c) is a comparative example of the present invention (no waterproof membrane), Example 1 (waterproof membrane in the sound wave inlet hole and no counter bore), Example 2 (waterproof membrane is located in the counter bore). ) Acoustic performance test result graph (a: SNR, b: MSL, c: BW).
  • FIG. 12 is a scene diagram (submersion) of a submersion performance test for an acoustic camera provided with a waterproofing means of the present invention.
  • 13 (a, b) is a water spray waterproof test method and result diagram (injection scene, internal confirmation scene after test) for an acoustic camera equipped with a waterproof means of the present invention.
  • An acoustic camera equipped with a waterproof means of the present invention includes a front protection unit 10 having a plurality of sound wave inlet holes 20 for inducing sound waves or ultrasonic waves to reach the MEMS microphone 20;
  • the MEMS microphones 30 that detect sound waves introduced through the sound wave inlet grooves 11 of the front protection unit 10 while being fixed to a substrate 30; a substrate 40 on which the MEMS microphones 20 are mounted;
  • an image capturing unit 50 for capturing a scene toward which the front protection unit 10 is facing using a photographing lens 41; a rear housing 60 covering the rear of the front protection unit 10; It is characterized in that it is configured to include; a waterproofing unit 70 that blocks water from reaching the MEMS microphone 30 or the substrate 40 through the sound wave inlet hole 20.
  • the width or diameter of the front side (exposure side) of the sound wave inlet hole 20 is larger than that of the rear side (substrate side), and the rear side (substrate side) ) to the front side (exposed side), it is preferable to be composed of an expandable shape in which the cross-sectional area continuously widens.
  • FIG. 1 is an overall configuration diagram of a sound camera equipped with a waterproofing means according to an embodiment of the present invention.
  • the acoustic camera equipped with a waterproof means includes a front protection unit 10, sound wave inlet holes 20 and MEMS. It is composed of the microphones 30, the substrate 40, the photographing means 50, the rear housing 60, and the waterproof means 70.
  • the front protection unit 10 is provided with a plurality of sound wave inlet holes 20 for inducing sound waves or ultrasonic waves to reach the MEMS microphone 20 .
  • the MEMS microphones 30 sense sound waves introduced through the sound wave inlet holes 20 of the front protection unit 10 while being fixed to the substrate 30 .
  • MEMS microphones 20 are mounted on the substrate 40 .
  • the photographing means 50 photographs the scene toward which the front protection unit 10 is facing.
  • the photographing means 50 includes an optical lens for imaging, and the optical lens is optically exposed toward the front through a lens hole located in the center of the front protection unit 10 to take an image.
  • the rear housing 60 covers the substrate 40 and the rear of the front protection unit 10 in a state where the substrate 40 is located on the rear side of the front protection unit 10. .
  • the waterproof unit 70 blocks water from reaching the MEMS microphone 30 or the substrate 40 through the sound wave inlet hole 20 .
  • the rear housing 60 may be a hollow cylindrical shape constituting a body as shown in FIG. 1, and otherwise, in the case of a movable sound camera (eg, the rear body of Registered Patent Registration No. 10-1471299), the front is protected. It may have a shape corresponding to the front protection unit 10 in terms of the size or shape of the unit 10.
  • the acoustic camera includes a data acquisition unit that acquires acoustic (sound wave or ultrasonic) signals detected by the MEMS microphones 30 through the sensor substrate unit 40, and a sound field visualization based on the acoustic signals of the data acquisition unit. and an arithmetic processing unit that calculates at least one necessary acoustic parameter (eg, a beam power level at a point on a virtual plane).
  • the calculation processing unit performs beamforming.
  • the arithmetic processing unit converts the generated acoustic parameter into a color image and overlaps the optical image image generated by the photographing unit 50 with the acoustic color image to generate an optical and acoustic superimposed image.
  • the data acquisition unit and the calculation processing unit are placed in a space (interior chamber) formed by the front body 10 and the rear housing 60.
  • a space formed by the front body 10 and the rear housing 60.
  • the frequency bands analyzed and processed by the calculation processing unit at least some frequencies belong to the range of 200 Hz to 100 KHz. More specifically, among the frequency bands analyzed and processed by the arithmetic processing unit of the acoustic camera based on the acoustic (sonic or ultrasonic) signals detected by the MEMS microphones 30, at least some frequencies belong to the range of 10 KHz to 30 KHz it is desirable
  • the analysis range is 1 KHz to 15 KHz
  • at least a part of "10 KHz to 15 KHz” belongs to the range of "frequency: 10 KHz to 30 KHz” of the present invention. included in the category
  • the analyzeable range is 25 KHz to 50 KHz
  • at least a part of "25 KHz to 30 KHz” falls within the scope of the present invention
  • "frequency: 10 KHz to 30 KHz range” so it is included in the scope of the present invention. do.
  • Figure 2a is a configuration diagram of the front body according to the first embodiment (sound wave inlet hole + waterproofing means) of the present invention
  • Figure 3a is a detailed view of the front body according to the first embodiment of the present invention
  • Figure 4 is a cross-sectional detailed view of the waterproofing means according to an embodiment of the present invention (a: before being pressed, b: after being pressed by the substrate)
  • Figure 5 (a, b) is a first embodiment of the present invention ( It is a front body, waterproof means part and substrate combination (cross-sectional view, cross-sectional detail view) according to sound wave inlet hole + waterproof means, lack of counter bore).
  • the waterproofing means 60 is the sound wave inflow It includes a sound wave permeable waterproof membrane 61 that shields the sound wave inlet hole 20 in the transverse direction to prevent water from penetrating through the hole 20 . Sound waves pass through the sound wave permeable waterproof membrane 61 and are transmitted toward the substrate, but water cannot penetrate the sound wave permeable waterproof membrane 61 .
  • the sound wave permeable waterproof membrane 61 is the front side of the front protection unit 10 or the midpoint of the sound wave inlet hole 20 (after the front end of the sound wave inlet hole). point between the ends) may be located.
  • the inner wall 20a forming the sound wave inlet hole 20 is separately manufactured and the waterproof membrane 61 is inserted. It can be manufactured in such a way as to assemble later.
  • the waterproofing unit 60 is It is preferable to be provided between the rear surface of the front protection unit 10 (among which the area where the sound wave inlet hole is formed) and the substrate 40 and the front surface of the substrate 40 .
  • the sound wave permeable waterproof membrane 61 of the waterproof unit 60 shields the sound wave inlet hole 20 formed in the front protection unit 10 in the transverse direction to prevent water from penetrating.
  • the MEMS microphones 30 attached to the substrate 40 are located facing each other at positions corresponding to the sound wave inlet holes 20 and the waterproof means 60.
  • the waterproof means 70 includes the sound wave permeable waterproof membrane 71 and the first adhesive layer. (72) and a sponge layer (73).
  • the sound wave permeable waterproof membrane 71 shields the sound wave inlet hole 20 in the transverse direction to prevent water from penetrating through the sound wave inlet hole 20 .
  • the first adhesive layer 72 is located on the periphery and front side of the sound wave permeable waterproof membrane 71 and comes into contact with the rear surface of the front protection unit 10 .
  • the sponge layer 73 is attached to the periphery of the rear side of the sound wave permeable waterproof membrane 71 (opposite to the first adhesive layer) and contacts the front surface of the substrate 40 to be pressed by the pressure of the substrate 40.
  • Compressible material consists of
  • the waterproof unit 70 has a second adhesive layer 75 attached to the front surface of the substrate 40 on the rear side of the sponge layer 73 (opposite the first adhesive layer 72). may be provided.
  • the sponge layer 73 is attached to the front surface of the substrate 40 by the second adhesive layer 75 .
  • the thickness of the sound wave permeable waterproof membrane 61 of the waterproof unit 60 is preferably 0.005 to 0.02 mm. If it is less than 0.005 mm, it is difficult to manufacture and waterproofness is weakened, and if it is more than 0.02 mm, waterproofness increases but sound wave permeability is poor.
  • F69 MBR fabric from Kolon Materials (Address: Kolon Tower, 11 Kolon-ro, Gwacheon-si, Gyeonggi-do, Korea) was ordered and used.
  • the width (or diameter) of the exposed portion may be the same as the width (or diameter) of the portion adjacent to the sensor. Alternatively, it is composed of an expandable shape in which the cross-sectional area becomes wider as it goes from the sensor adjacent portion to the outer exposed portion.
  • the front protector may be made of plastic or metal, and after being produced in the form of injection, etc., the sound wave inlet hole 20 may be formed by cutting or punching.
  • One of the horizontal and vertical sizes of the front protector 10 is in the range of 5.0 to 50 cm. In case of more than 50 cm, it is inappropriate to construct a movable acoustic camera. In the case of less than 5 cm, there is a problem in that the number of acoustic sensors and the separation distance are limited. Therefore, the range of 5.0 to 50 cm is suitable, and more preferably about 7.5 to 35 cm is preferred from the viewpoint of mobility.
  • the front protection unit 10 is made of plastic or metal material and has a plane or a curved surface convex to the exposure side, and the sound wave inlet hole 20 has a shape penetrating the front protection unit 10, and 10 to 300 , and one MEMS microphone 30 is disposed in one sound wave inlet hole 20 .
  • the number of sound wave inlet holes 20 is preferably 10 to 300, but if the number is less than 10, the separation distance between the sensors on the substrate of the same size increases and the upper limit of the frequency that can visualize the sound field occurs.
  • the plurality of MEMS microphones 30 are integrally mounted on a rigid or flexible substrate 40, and as the front protection unit 10 and the substrate 40 are integrally coupled, the single sound wave Inside the inlet hole 20, one MEMS microphone 30 is positioned to correspond to each.
  • Figure 2b is a front body configuration diagram according to the second embodiment (sound wave inlet hole + counter bore + waterproofing means) of the present invention
  • Figure 3b is a detailed view of the front body according to the second embodiment of the present invention.
  • Figure 6 is a front body, waterproof means and substrate coupling (cross-sectional view, cross-sectional detail view) according to the second embodiment of the present invention (sound wave inlet hole + counterbore + waterproof means)
  • Figure 7 are the front body, waterproof means and substrate coupling (a: before being pressed, b: after being pressed by the substrate) according to the second embodiment of the present invention (sound wave inlet hole + counter bore + waterproof means)
  • Figure 8 is a configuration diagram of the back of the front body having a counter bore according to the second embodiment of the present invention (a: before mounting the waterproofing means, b, c, d: waterproofing means) after mounting and before board mounting).
  • the acoustic camera equipped with the waterproof means according to the second embodiment (sound wave inlet hole + counterbore + waterproof means) of the present invention has a front protection unit 10
  • a counter bore 15 formed by stepwise digging from the rear surface of the front body 10a is further formed in the rear surface of the rear surface where the sound wave inlet hole 20 is formed.
  • the waterproofing means 60 is placed in the counter bore 15.
  • the periphery of the sound wave permeable waterproof membrane 71 is attached to the bottom surface of the counterbore 15 (stepped groove) by the first adhesive layer 72.
  • the counter bore 15 may be a stepped groove or a flat cylindrical groove formed by being inserted into the front side of the rear side of the front protection unit 10, that is, the opposite side of the sound wave inlet hole 20 formed in the front side.
  • the counter bore 15 communicates with the rear of the sound wave inlet hole 20 .
  • the counter bore 15 provides a space in which the waterproofing means 60 is placed and provides convenience in installing the waterproofing means 60 .
  • the step of the counterbore 15 prevents the watertight means 60 from escaping in the lateral direction.
  • the waterproofing means portion 60 has a counter bore ( When positioned at 15), the sponge layer 73 protrudes rearwardly higher than the back surface of the counterbore 15. In such a state, as shown in FIG. 7B , the front surface of the substrate 40 presses the sponge layer 73 and is combined with the front protection unit 10 .
  • the depth of the counter bore 15 is preferably 0.2 to 2 mm.
  • the waterproofing means 60 When the depth of the counterbore 15 is less than 0.2 mm, the waterproofing means 60 may be laterally displaced, and when the depth of the counterbore 15 exceeds 2mm, the size of the waterproofing means 60 is larger than necessary. There is a growing problem.
  • the depth of the counter bore 15 is 0.45 mm and the waterproofing means 60 including the sponge layer 73. ) is 0.66 mm.
  • the sponge layer 73 has restoring force while being pressed by 0.21 mm by the pressure of the substrate 40 . Due to the restoring force of the sponge layer 73, the periphery of the sound wave permeable waterproof membrane 71 adheres to the bottom surface of the counter bore 15 (stepped groove) or the rear surface of the front protection unit 10. Due to this, the separation and separation of the waterproof membrane 71 is prevented.
  • an upper protruding cover 80 which is fixed to the upper portion of the front protection unit 10 or the rear housing 60 and protrudes forward more than the front side of the front protection unit 10 is further included. can do.
  • the width or diameter of the front side (exposure side) of the sound wave inlet hole 20 is greater than the width or diameter of the rear side (substrate side). It is larger and is composed of an expandable shape in which the cross-sectional area continuously widens from the rear side (substrate side) to the front side (exposure side).
  • SNR signal-to-noise ratio
  • Figure 9 is a configuration diagram of the front body and substrate assembly according to an embodiment of the present invention.
  • the substrate 40 is coupled to the front protection unit 10 by means of assembling means.
  • FIG. 10 is an explanatory view of the acoustic performance test method for the acoustic camera of the present invention
  • FIG. 11 (a, b, c) is a comparative example of the present invention (extended sound wave inlet hole, no waterproof membrane)
  • Example 1 extended sound wave Acoustic performance test results graphs (a: SNR, b: MSL, c: BW) for Example 2 (extended sound wave inlet hole + waterproof membrane + counter bore) .
  • the signal-to-noise ratio measurement result (SNR) for each frequency is generally determined to be excellent when the signal-to-noise ratio of the sensor is high, and a sensor or array having a higher SNR can measure even smaller sounds.
  • the acoustic cameras equipped with the waterproof means according to the first and second embodiments of the present invention generally have the same array sensor performance as the existing acoustic camera (comparative example) without the waterproof means attached. It was confirmed that it showed equal or higher performance in the region of 20 kHz or higher.
  • the maximum side lobe level measurement result (MSL) for each frequency is one of the representative performance indicators of an array sensor, and the higher the MSL, the better the performance for simultaneously discriminating noise sources of various sizes.
  • MSL maximum side lobe level measurement result
  • the higher the msl the better the performance of the array sensor.
  • 3dB beamwidth performance measurement result for each frequency (3dB bandwidth) This is one of the representative performance indicators of an array sensor, and the performance is determined by calculating the beamwidth at a position of -3dB at the maximum side lobe level. The smaller the beam width, the better the ability to distinguish several nearby noise sources. In general, the smaller the 3dB bandwidth, the better the performance of the array sensor.
  • the acoustic camera equipped with the waterproof means according to the first and second embodiments of the present invention has performance aspects compared to conventional acoustic cameras (comparative examples) without waterproof means attached. It was confirmed that there was no significant difference in
  • FIG. 12 is a scene diagram (immersion) of a submersion performance test for an acoustic camera provided with a waterproofing means of the present invention. As a result of the immersion test, it was confirmed that water did not permeate the substrate 40 .
  • Center of water flow a circle of about 40 mm, 2.5 m away from the nozzle
  • Test time 1 minute per 1 m 2 of enclosure surface area, minimum test time 3 minutes (test time: 3 minutes)
  • an acoustic camera having excellent sound sensing performance and having a waterproof function is provided so that it can be installed or used in a mobile environment instead of indoors.

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Abstract

The present invention relates to an acoustic camera, having a waterproof means, comprising: a front protection part (10) having a plurality of sound wave inlet holes (20) for guiding a sound wave or an ultrasonic wave to reach MEMS microphones (20); MEMS microphones (30) for sensing a sound wave flowing in through the sound wave inlet holes (11) of the front protection part (10), while fixed to a substrate (40); the substrate (40) on which the MEMS microphones (20) are mounted; an image capturing part (50) for capturing the scene toward which the front protection part (10) is facing, by means of a capturing lens (41); a rear housing (60) for covering the rear of the front protection part (10) while the substrate (40) is positioned on the rear surface of the front protection part (10); and a waterproof means part (70) for preventing water from reaching the MEMS microphones (30) or the substrate (40) through the sound wave inlet holes (20).

Description

방수 수단이 구비된 음향 카메라Acoustic camera with waterproofing means
본 발명은 방수 수단이 구비된 음향 카메라에 관한 것이다. The present invention relates to an acoustic camera equipped with waterproofing means.
등록특허 제10-1213540호(특허권자 : (주)에스엠인스트루먼트)는, 회로기판(Print Circuit Board, 20)에 탑재하여 구성되고 감지된 음향에 관한 신호를 데이터수집부로 송신하는 음향감지장치와; 상기 음향감지장치와 연결되고, 상기 음향감지장치로부터 송신된 음향에 관한 아날로그 신호를 샘플링하하여 음향에 관한 디지털신호로 변환하고 이를 중앙처리부로 송신하는 데이터수집부와 상기 데이터수집부와 연결되고, 상기 데이터 수집부로부터 송신된 음향에 관한 디지털신호를 기초로 각 MEMS 마이크로폰과 관련 소음레벨을 계산하는 중앙처리부와 상기 중앙처리부와 연결되고, 상기 중앙처리부에서 계산된 각 MEMS 마이크로폰과 관련된 소음레벨을 색상으로 디스플레이하는 디스플레이부를 포함하여 구성되는 것을 특징으로 하는 MEMS 마이크로폰 어레이를 이용한 음향카메라를 게시한다. 음향 카메라의 경우 음향 센서가 공기 중에 노출되어야 하기 때문에 센서이 전방에 홈이 형성되어 있다.Registered Patent No. 10-1213540 (Patentee: SM Instruments Co., Ltd.) is a sound sensing device configured to be mounted on a circuit board (Print Circuit Board, 20) and transmitting a signal related to detected sound to a data collection unit; A data collection unit that is connected to the sound sensing device, samples an analog signal related to sound transmitted from the sound sensing device, converts it into a digital signal related to sound, and transmits the analog signal related to sound to a central processing unit, and is connected to the data collection unit, A central processing unit that calculates a noise level related to each MEMS microphone based on the digital signal related to the sound transmitted from the data collection unit, and is connected to the central processing unit, and the noise level calculated by the central processing unit is associated with each MEMS microphone. Post an acoustic camera using a MEMS microphone array, characterized in that configured to include a display unit for displaying. In the case of an acoustic camera, since the acoustic sensor must be exposed to air, a groove is formed in front of the sensor.
등록특허 제10-1471299호(특허권자 : (주)에스엠인스트루먼트, (주)현대자동차)는 MEMS 마이크로폰들의 음향감지부가 전방을 향하게 배치되는 전방몸체와; 기판(substrate)에 고정된 상태에서 음향감지부가 상기 전방몸체에 노출되는 상기 MEMS 마이크로폰들과; 상기 MEMS 마이크로폰들이 장착되는 기판과; 상기 전방몸체의 렌즈홀을 통하여 촬영렌즈가 노출되는 영상촬영부와; 상기 전방몸체의 후면측에 상기 기판이 위치된 상태에서 상기 기판의 후측과 영상촬영부의 후측을 감싸는 후방몸체; 을 포함하여 구성되고, 상기 전방몸체는 평면을 이루는 전방판을 포함하고, 상기 전방판과 상기 기판은 평행하게 배치되는 것을 특징으로 하는 이동식 음향 카메라를 개시한다.Registered Patent No. 10-1471299 (patent holder: SM Instruments Co., Ltd., Hyundai Motor Co., Ltd.) is a front body in which sound sensing parts of MEMS microphones are disposed facing forward; the MEMS microphones in which sound sensing units are exposed to the front body while being fixed to a substrate; a substrate on which the MEMS microphones are mounted; an image capturing unit in which a photographing lens is exposed through the lens hole of the front body; a rear body covering the rear side of the substrate and the rear side of the image capture unit in a state where the substrate is positioned on the rear side of the front body; Disclosed is a movable sound camera comprising a structure, wherein the front body includes a front plate forming a plane, and the front plate and the substrate are disposed in parallel.
본 발명은 음향 감지 성능이 우수하면서 실내가 아닌 야외 장소에서 설치 또는 이동식 사용이 가능하도록 방수 기능을 구비한 음향 카메라를 제공하기 위함이다.An object of the present invention is to provide an acoustic camera having excellent sound sensing performance and having a waterproof function so that it can be installed or used in a mobile environment, not indoors.
본 발명의 방수 수단이 구비된 음향 카메라는 음파 또는 초음파가 MEMS 마이크로폰(20)에 도달하도록 유도하는 복수개의 음파유입홀(20)들이 구비된 전방보호부(10)와; 기판(substrate, 30)에 고정된 상태에서 상기 전방보호부(10)의 음파유입홈(11)들을 통하여 유입되는 음파를 감지하는 상기 MEMS 마이크로폰(30)들과; 상기 MEMS 마이크로폰(20)들이 장착되는 기판(40)과;An acoustic camera equipped with a waterproof means of the present invention includes a front protection unit 10 having a plurality of sound wave inlet holes 20 for inducing sound waves or ultrasonic waves to reach the MEMS microphone 20; The MEMS microphones 30 that detect sound waves introduced through the sound wave inlet grooves 11 of the front protection unit 10 while being fixed to a substrate 30; a substrate 40 on which the MEMS microphones 20 are mounted;
촬영렌즈(41)를 이용하여 상기 전방보호부(10)가 향하고 있는 장면을 촬영하는 영상촬영부(50)와; 전방보호부(10)의 후방을 커버하는 후방하우징(60)과; 물이 상기 음파유입홀(20)를 통하여 MEMS 마이크로폰(30) 또는 기판(40)에 도달하는 것을 차단하는 방수수단부(70);를 포함하여 구성되는 것을 특징으로 한다.an image capturing unit 50 for capturing a scene toward which the front protection unit 10 is facing using a photographing lens 41; a rear housing 60 covering the rear of the front protection unit 10; It is characterized in that it is configured to include; a waterproofing unit 70 that blocks water from reaching the MEMS microphone 30 or the substrate 40 through the sound wave inlet hole 20.
본 발명의 방수 수단이 구비된 음향 카메라에 있어서, 방수수단부(60)는 음파유입홀(20)을 통하여 물이 침투하지 못하도록 음파유입홀(20)을 횡방향으로 차폐하는 음파 투과성 방수 멤브레인(61)을 포함한다. 음파 투과성 방수 멤브레인(71)의 전후 방향(도4) 위치는, 상기 전방보호부(10)의 전면, 상기 음파유입홀(20)의 중간지점(음파유입홀 전단부과 후단부 사이 지점), 또는 상기 전방보호부(10)의 후면과 기판(40)의 전면 사이에 구비되는 것이 바람직하다. 더욱 바람직하게 본 발명의 방수 수단이 구비된 음향 카메라에 있어서, 방수수단부(70)는 상기 전방보호부(10)의 후면과 기판(40)의 전면 사이에 구비된다.In the acoustic camera equipped with the waterproof means of the present invention, the waterproof means portion 60 is a sound wave permeable waterproof membrane ( 61). The position of the sound wave permeable waterproof membrane 71 in the front-back direction (FIG. 4) is the front of the front protection part 10, the midpoint of the sound wave inlet hole 20 (the point between the front and rear ends of the sound wave inlet hole), or Preferably, it is provided between the rear surface of the front protection unit 10 and the front surface of the substrate 40 . More preferably, in the sound camera equipped with the waterproof means of the present invention, the waterproof means part 70 is provided between the rear surface of the front protection part 10 and the front surface of the substrate 40 .
본 발명의 방수 수단이 구비된 음향 카메라에 있어서, 음파유입홀(20)은 전방측(노출측)의 폭 또는 직경이 후방측(기판측)의 폭 또는 직경보다 더 크고, 후방측(기판측)에서 전방측(노출측)으로 갈수록 횡단면적이 연속적으로 넓어지는 확장형 형상으로 구성되는 것이 바람직하다.In the sound camera equipped with the waterproof means of the present invention, the width or diameter of the front side (exposure side) of the sound wave inlet hole 20 is larger than that of the rear side (substrate side), and the rear side (substrate side) ) to the front side (exposed side), it is preferable to be composed of an expandable shape in which the cross-sectional area continuously widens.
본 발명에 따르는 경우, 음향 감지 성능이 우수하면서 실내가 아닌 야외 장소에서 설치 또는 이동식 사용이 가능하도록 방수 기능을 구비한 음향 카메라가 제공된다.According to the present invention, an acoustic camera having excellent sound sensing performance and having a waterproof function is provided so that it can be installed or used in a mobile environment instead of indoors.
도 1은 본 발명의 일실시예에 따른 방수 수단이 구비된 음향 카메라 전체 구성도.1 is an overall configuration diagram of a sound camera equipped with a waterproofing means according to an embodiment of the present invention.
도 2a는 본 발명의 제1 실시예(음파유입홀 + 방수 수단)에 따른 전방몸체 구성도, 도 2b는 본 발명의 제2 실시예(음파유입홀 + 카운터보어 + 방수수단)에 따른 전방몸체 구성도.Figure 2a is a front body configuration diagram according to the first embodiment (sound wave inlet hole + waterproofing means) of the present invention, Figure 2b is a front body according to the second embodiment (sound wave inlet hole + counterbore + waterproofing means) of the present invention Diagram.
도 3(a, b)은 도 2(a, b) 본 발명의 제1, 제2 실시예에 따른 전방몸체 상세도.Figure 3 (a, b) is a detailed view of the front body according to Figure 2 (a, b) the first and second embodiments of the present invention.
도 4는 본 발명의 일실시예에 따른 방수수단부 단면 상세도.(a: 눌리기 전, b : 기판에 의해 눌린 후)Figure 4 is a detailed cross-sectional view of the waterproofing means according to an embodiment of the present invention. (a: before being pressed, b: after being pressed by the substrate)
도 5(a, b)은 본 발명의 제1 실시예(음파유입홀 + 방수 수단)에 따른 전방몸체, 방수수단부 및 기판 결합도(단면도, 단면 상세도). Figure 5 (a, b) is a front body, waterproof means and substrate coupling (cross-sectional view, cross-sectional detail view) according to the first embodiment of the present invention (sound wave inlet hole + waterproof means).
도 6(a, b, c)은 본 발명의 제2 실시예(음파유입홀 + 카운터보어 + 방수수단)에 따른 전방몸체, 방수수단부 및 기판 결합도(단면도, 단면 상세도). Figure 6 (a, b, c) is a front body, waterproof means and substrate coupling (cross-sectional view, cross-sectional detail view) according to the second embodiment (sound wave inlet hole + counter bore + waterproof means) of the present invention.
도 7(a, b)은 본 발명의 제2 실시예(음파유입홀 + 카운터보어 + 방수수단)에 따른 전방몸체, 방수수단부 및 기판 결합도(a: 눌리기 전, b : 기판에 의해 눌린 후). Figure 7 (a, b) is a front body, waterproof means and substrate coupling (a: before pressing, b: by the substrate) according to the second embodiment (sound wave inlet hole + counter bore + waterproof means) of the present invention after being pressed).
도 8(a, b, c, d)은 본 발명의 제2 실시예에 따른 카운터 보어를 갖는 전방몸체 후면 구성도(a :방수수단부 장착 전, b, c, d : 방수수단부 장착 후 기판 장착전). 8 (a, b, c, d) is a configuration diagram of the back of the front body having a counter bore according to the second embodiment of the present invention (a: before mounting the waterproofing means, b, c, d: after mounting the waterproofing means) before board mounting).
도 9는 본 발명의 일실시예에 따른 전방몸체 및 기판 결합체 구성도. Figure 9 is a configuration diagram of the front body and substrate assembly according to an embodiment of the present invention.
도 10은 본 발명의 음향 카메라에 대한 음향 성능 시험 방법 설명도.10 is an explanatory diagram of an acoustic performance test method for an acoustic camera of the present invention.
도 11(a, b, c)는 본 발명의 비교예(방수 멤브레인 없슴), 실시예 1(음파유입홀에 방수 멤브레인 있고 카운터 보어 없슴), 실시예 2(방수멤브레인이 카운터 보어에 위치함.)에 대한 음향 성능 시험 결과 그래프(a : SNR, b : MSL, c : BW).Figure 11 (a, b, c) is a comparative example of the present invention (no waterproof membrane), Example 1 (waterproof membrane in the sound wave inlet hole and no counter bore), Example 2 (waterproof membrane is located in the counter bore). ) Acoustic performance test result graph (a: SNR, b: MSL, c: BW).
도 12는 본 발명의 방수 수단이 구비된 음향 카메라에 대한 침수 성능 시험 장면도(침수).12 is a scene diagram (submersion) of a submersion performance test for an acoustic camera provided with a waterproofing means of the present invention.
도 13(a, b)는 본 발명의 의 방수 수단이 구비된 음향 카메라에 대한 물 분사 방수 시험 방법 및 결과도(분사 장면, 시험 후 내부 확인 장면).13 (a, b) is a water spray waterproof test method and result diagram (injection scene, internal confirmation scene after test) for an acoustic camera equipped with a waterproof means of the present invention.
본 발명의 방수 수단이 구비된 음향 카메라는 음파 또는 초음파가 MEMS 마이크로폰(20)에 도달하도록 유도하는 복수개의 음파유입홀(20)들이 구비된 전방보호부(10)와; 기판(substrate, 30)에 고정된 상태에서 상기 전방보호부(10)의 음파유입홈(11)들을 통하여 유입되는 음파를 감지하는 상기 MEMS 마이크로폰(30)들과; 상기 MEMS 마이크로폰(20)들이 장착되는 기판(40)과;An acoustic camera equipped with a waterproof means of the present invention includes a front protection unit 10 having a plurality of sound wave inlet holes 20 for inducing sound waves or ultrasonic waves to reach the MEMS microphone 20; The MEMS microphones 30 that detect sound waves introduced through the sound wave inlet grooves 11 of the front protection unit 10 while being fixed to a substrate 30; a substrate 40 on which the MEMS microphones 20 are mounted;
촬영렌즈(41)를 이용하여 상기 전방보호부(10)가 향하고 있는 장면을 촬영하는 영상촬영부(50)와; 전방보호부(10)의 후방을 커버하는 후방하우징(60)과; 물이 상기 음파유입홀(20)를 통하여 MEMS 마이크로폰(30) 또는 기판(40)에 도달하는 것을 차단하는 방수수단부(70);를 포함하여 구성되는 것을 특징으로 한다.an image capturing unit 50 for capturing a scene toward which the front protection unit 10 is facing using a photographing lens 41; a rear housing 60 covering the rear of the front protection unit 10; It is characterized in that it is configured to include; a waterproofing unit 70 that blocks water from reaching the MEMS microphone 30 or the substrate 40 through the sound wave inlet hole 20.
본 발명의 방수 수단이 구비된 음향 카메라에 있어서, 방수수단부(60)는 음파유입홀(20)을 통하여 물이 침투하지 못하도록 음파유입홀(20)을 횡방향으로 차폐하는 음파 투과성 방수 멤브레인(61)을 포함한다. 음파 투과성 방수 멤브레인(71)의 전후 방향(도4) 위치는, 상기 전방보호부(10)의 전면, 상기 음파유입홀(20)의 중간지점(음파유입홀 전단부과 후단부 사이 지점), 또는 상기 전방보호부(10)의 후면과 기판(40)의 전면 사이에 구비되는 것이 바람직하다. 더욱 바람직하게 본 발명의 방수 수단이 구비된 음향 카메라에 있어서, 방수수단부(70)는 상기 전방보호부(10)의 후면과 기판(40)의 전면 사이에 구비된다.In the acoustic camera equipped with the waterproof means of the present invention, the waterproof means portion 60 is a sound wave permeable waterproof membrane ( 61). The position of the sound wave permeable waterproof membrane 71 in the front-back direction (FIG. 4) is the front of the front protection part 10, the midpoint of the sound wave inlet hole 20 (the point between the front and rear ends of the sound wave inlet hole), or Preferably, it is provided between the rear surface of the front protection unit 10 and the front surface of the substrate 40 . More preferably, in the sound camera equipped with the waterproof means of the present invention, the waterproof means part 70 is provided between the rear surface of the front protection part 10 and the front surface of the substrate 40 .
본 발명의 방수 수단이 구비된 음향 카메라에 있어서, 음파유입홀(20)은 전방측(노출측)의 폭 또는 직경이 후방측(기판측)의 폭 또는 직경보다 더 크고, 후방측(기판측)에서 전방측(노출측)으로 갈수록 횡단면적이 연속적으로 넓어지는 확장형 형상으로 구성되는 것이 바람직하다.In the sound camera equipped with the waterproof means of the present invention, the width or diameter of the front side (exposure side) of the sound wave inlet hole 20 is larger than that of the rear side (substrate side), and the rear side (substrate side) ) to the front side (exposed side), it is preferable to be composed of an expandable shape in which the cross-sectional area continuously widens.
이하에서 본 발명의 방수 수단이 구비된 음향 카메라에 대하여 첨부된 도면을 참조하여 상세하게 설명한다. 도 1은 본 발명의 일실시예에 따른 방수 수단이 구비된 음향 카메라 전체 구성도이다. Hereinafter, the acoustic camera provided with the waterproofing means of the present invention will be described in detail with reference to the accompanying drawings. 1 is an overall configuration diagram of a sound camera equipped with a waterproofing means according to an embodiment of the present invention.
도 1 내지 도 7에 도시된 바와 같이, 본 발명의 일실시예에 따른 방수 수단이 구비된 음향 카메라 방수 수단이 구비된 음향 카메라는 전방보호부(10)와 음파유입홀(20)들과 MEMS 마이크로폰(30)들과 기판(40)과 촬영수단(50)과 후방하우징(60)과 방수수단부(70)를 포함하여 구성된다.As shown in FIGS. 1 to 7 , the acoustic camera equipped with a waterproof means according to an embodiment of the present invention includes a front protection unit 10, sound wave inlet holes 20 and MEMS. It is composed of the microphones 30, the substrate 40, the photographing means 50, the rear housing 60, and the waterproof means 70.
전방보호부(10)는 음파 또는 초음파가 MEMS 마이크로폰(20)에 도달하도록 유도하는 복수개의 음파유입홀(20)들이 구비된다. MEMS 마이크로폰(30)들은 기판(substrate, 30)에 고정된 상태에서 상기 전방보호부(10)의 음파유입홀(20)들을 통하여 유입되는 음파를 감지한다. 기판(40)에 MEMS 마이크로폰(20)들이 장착된다. The front protection unit 10 is provided with a plurality of sound wave inlet holes 20 for inducing sound waves or ultrasonic waves to reach the MEMS microphone 20 . The MEMS microphones 30 sense sound waves introduced through the sound wave inlet holes 20 of the front protection unit 10 while being fixed to the substrate 30 . MEMS microphones 20 are mounted on the substrate 40 .
촬영수단(50)은 전방보호부(10)가 향하고 있는 장면을 촬영한다. 일실시예에서 촬영수단(50)은 촬상용 광학렌즈를 포함하며 광학렌즈는 전방보호부(10)의 중앙에 위치한 렌즈홀을 통하여 전방을 향하여 광학적으로 노출되어 영상 촬영이 이루어진다. The photographing means 50 photographs the scene toward which the front protection unit 10 is facing. In one embodiment, the photographing means 50 includes an optical lens for imaging, and the optical lens is optically exposed toward the front through a lens hole located in the center of the front protection unit 10 to take an image.
도 1에 도시된 바와 같이, 후방하우징(60)은 전방보호부(10)의 후면측에 상기 기판(40)이 위치된 상태에서 기판(40) 및 전방보호부(10)의 후방을 커버한다. 방수수단부(70)는 물이 상기 음파유입홀(20)를 통하여 MEMS 마이크로폰(30) 또는 기판(40)에 도달하는 것을 차단한다. 후방하우징(60)은 도 1에 도시된 바와 같이 몸체를 이루는 중공 원통형상일수 있으며, 이와 달리 이동식 음향 카메라(예를들어, 등록특허 등록특허 제10-1471299호의 후방몸체와 같이)의 경우 전방보호부(10)와 크기나 대략 형상 관점에서 전방보호부(10)에 대응하는 형상일 수 있다.As shown in FIG. 1, the rear housing 60 covers the substrate 40 and the rear of the front protection unit 10 in a state where the substrate 40 is located on the rear side of the front protection unit 10. . The waterproof unit 70 blocks water from reaching the MEMS microphone 30 or the substrate 40 through the sound wave inlet hole 20 . The rear housing 60 may be a hollow cylindrical shape constituting a body as shown in FIG. 1, and otherwise, in the case of a movable sound camera (eg, the rear body of Registered Patent Registration No. 10-1471299), the front is protected. It may have a shape corresponding to the front protection unit 10 in terms of the size or shape of the unit 10.
음향 카메라는, 센서용 기판부(40)을 통해 MEMS 마이크로폰(30)들에 의해 감지된 음향(음파 또는 초음파) 신호를 습득하는 데이터 습득부와, 데이터 습득부의 음향 신호를 기초로 하여 음장 가시화에 필요한 적어도 하나의 음향 파라미터(예를들어, 가상 평면 상의 일지점의 빔 파워 레벨)를 연산하는 연산처리부를 포함한다. 연산처리부는 빔 포밍을 실시한다. 또한, 연산처리부는 생성된 음향 파라미터를 색상 이미지로 변환하고 촬영수단(50)을 통해 생성된 광학 화상 이미지와 음향 색상 이미지를 중첩하여 광 음향 중첩 이미지를 생성한다.The acoustic camera includes a data acquisition unit that acquires acoustic (sound wave or ultrasonic) signals detected by the MEMS microphones 30 through the sensor substrate unit 40, and a sound field visualization based on the acoustic signals of the data acquisition unit. and an arithmetic processing unit that calculates at least one necessary acoustic parameter (eg, a beam power level at a point on a virtual plane). The calculation processing unit performs beamforming. In addition, the arithmetic processing unit converts the generated acoustic parameter into a color image and overlaps the optical image image generated by the photographing unit 50 with the acoustic color image to generate an optical and acoustic superimposed image.
데이터 습득부와 연산처리부는 전방몸체(10)와 후방하우징(60)이 형성하는 공간(내장실)에 안치된다. 여기서, 연산처리부에 의해 분석 처리되는 주파수 대역 중, 적어도 일부 주파수는 200 Hz ~ 100 KHz 범위에 속한다. 좀 더 구체적으로, MEMS 마이크로폰(30)들에 의해 감지된 음향(음파 또는 초음파) 신호를 기초로 하여 음향 카메라의 연산처리부에 의해 분석 처리되는 주파수 대역 중, 적어도 일부 주파수는 10KHz ~ 30KHz 범위에 속하는 것이 바람직하다.The data acquisition unit and the calculation processing unit are placed in a space (interior chamber) formed by the front body 10 and the rear housing 60. Here, among the frequency bands analyzed and processed by the calculation processing unit, at least some frequencies belong to the range of 200 Hz to 100 KHz. More specifically, among the frequency bands analyzed and processed by the arithmetic processing unit of the acoustic camera based on the acoustic (sonic or ultrasonic) signals detected by the MEMS microphones 30, at least some frequencies belong to the range of 10 KHz to 30 KHz it is desirable
예를들어, 일실시예에서 분석 가능 범위가 1 KHz 1~ 15KHz 인 경우, 적어도 일부에 해당하는 "10 KHz ~ 15KHz"가 본 발명의 범위인 "주파수 : 10KHz ~ 30KHz 범위"에 속하므로 본 발명의 범주에 포함된다. 또한, 다른 실시예에서 분석 가능 범위가 25 KHz ~ 50KHz 인 경우, 적어도 일부에 해당하는 "25 KHz ~ 30KHz"가 본 발명의 범위인 "주파수 : 10KHz ~ 30KHz 범위"에 속하므로 본 발명의 범주에 포함된다.For example, in one embodiment, when the analysis range is 1 KHz to 15 KHz, at least a part of "10 KHz to 15 KHz" belongs to the range of "frequency: 10 KHz to 30 KHz" of the present invention. included in the category In addition, in another embodiment, when the analyzeable range is 25 KHz to 50 KHz, at least a part of "25 KHz to 30 KHz" falls within the scope of the present invention, "frequency: 10 KHz to 30 KHz range", so it is included in the scope of the present invention. do.
<제1, 제 2실시예 공통> <Common to First and Second Embodiments>
도 2a는 본 발명의 제1 실시예(음파유입홀 + 방수 수단)에 따른 전방몸체 구성도이거, 도 3a는 본 발명의 제1 실시예에 따른 전방몸체 상세도이다. 도 4는 본 발명의 일실시예에 따른 방수수단부 단면 상세도(a: 눌리기 전, b : 기판에 의해 눌린 후)이고, 도 5(a, b)은 본 발명의 제1 실시예(음파유입홀 + 방수 수단, 카운터 보어 미구비)에 따른 전방몸체, 방수수단부 및 기판 결합도(단면도, 단면 상세도)이다. Figure 2a is a configuration diagram of the front body according to the first embodiment (sound wave inlet hole + waterproofing means) of the present invention, Figure 3a is a detailed view of the front body according to the first embodiment of the present invention. Figure 4 is a cross-sectional detailed view of the waterproofing means according to an embodiment of the present invention (a: before being pressed, b: after being pressed by the substrate), and Figure 5 (a, b) is a first embodiment of the present invention ( It is a front body, waterproof means part and substrate combination (cross-sectional view, cross-sectional detail view) according to sound wave inlet hole + waterproof means, lack of counter bore).
도 4, 도 5(a, b), 도 6(a, b, c)에 도시된 바와 같이, 본 발명의 제1 실시예 및 제2 실시예에 있어서, 방수수단부(60)는 음파유입홀(20)을 통하여 물이 침투하지 못하도록 음파유입홀(20)을 횡방향으로 차폐하는 음파 투과성 방수 멤브레인(61)을 포함한다. 음파는 음파 투과성 방수 멤브레인(61)을 통과하여 기판 방향으로 전달되지만 물은 음파 투과성 방수 멤브레인(61)을 투과하지 못한다. As shown in Figures 4, 5 (a, b), and 6 (a, b, c), in the first and second embodiments of the present invention, the waterproofing means 60 is the sound wave inflow It includes a sound wave permeable waterproof membrane 61 that shields the sound wave inlet hole 20 in the transverse direction to prevent water from penetrating through the hole 20 . Sound waves pass through the sound wave permeable waterproof membrane 61 and are transmitted toward the substrate, but water cannot penetrate the sound wave permeable waterproof membrane 61 .
음파 투과성 방수 멤브레인(61)의 전후 방향 위치에 대해서 설명하자면, 음파 투과성 방수 멤브레인(61)은 전방보호부(10)의 전면, 또는 음파유입홀(20)의 중간지점(음파유입홀 전단부과 후단부 사이 지점)에 위치할 수 있다. 음파 투과성 방수 멤브레인(61)이 중간지점(음파유입홀 전단부과 후단부 사이 지점)에 위치하는 경우 음파유입홀(20)을 형성하는 내벽(20a) 부분을 분리 제작하여 방수 멤브레인(61)을 삽입 후에 조립하는 방식으로 제작될 수 있다.To describe the position of the sound wave permeable waterproof membrane 61 in the front-back direction, the sound wave permeable waterproof membrane 61 is the front side of the front protection unit 10 or the midpoint of the sound wave inlet hole 20 (after the front end of the sound wave inlet hole). point between the ends) may be located. When the sound wave permeable waterproof membrane 61 is located at the midpoint (the point between the front and rear ends of the sound wave inlet hole), the inner wall 20a forming the sound wave inlet hole 20 is separately manufactured and the waterproof membrane 61 is inserted. It can be manufactured in such a way as to assemble later.
본 발명의 제1 실시예, 제2 실시예에 따른 음향 카메라에 있어서, 도 5(a, b), 도 6(a, b, c)에 도시된 바와 같이, 방수수단부(60)는 상기 전방보호부(10)의 후면(중에서 음파유입홀이 형성된 영역)과 기판(40)과 기판(40)의 전면 사이에 구비되는 것이 바람직하다. 방수수단부(60)의 음파 투과성 방수 멤브레인(61)은 전방보호부(10)에 형성된 음파유입홀(20)을 물이 침투하지 못하도록 횡방향으로 차폐한다. 기판(40)에 부착된 MEMS 마이크로폰(30)들은 음파유입홀(20)들 및 방수수단부(60)들과 서로 상응하는 위치에 마주보며 위치한다.In the acoustic cameras according to the first and second embodiments of the present invention, as shown in FIGS. 5 (a, b) and 6 (a, b, c), the waterproofing unit 60 is It is preferable to be provided between the rear surface of the front protection unit 10 (among which the area where the sound wave inlet hole is formed) and the substrate 40 and the front surface of the substrate 40 . The sound wave permeable waterproof membrane 61 of the waterproof unit 60 shields the sound wave inlet hole 20 formed in the front protection unit 10 in the transverse direction to prevent water from penetrating. The MEMS microphones 30 attached to the substrate 40 are located facing each other at positions corresponding to the sound wave inlet holes 20 and the waterproof means 60.
본 발명의 제1 실시예, 제2 실시예에 있어서, 도 4, 도 5b, 도 6b, 도 6c에 도시된 바와 같이, 방수수단부(70)는 음파 투과성 방수 멤브레인(71)과 제1 접착층(72)과 스펀지층(73)으로 구성될 수 있다. 음파 투과성 방수 멤브레인(71)은 음파유입홀(20)을 통하여 물이 침투하지 못하도록 음파유입홀(20)을 횡방향으로 차폐한다. 제1 접착층(72)은 음파 투과성 방수 멤브레인(71)의 주변부 및 전방측에 위치하여 전방보호부(10)의 후면에 접면된다. In the first embodiment and the second embodiment of the present invention, as shown in FIGS. 4, 5B, 6B, and 6C, the waterproof means 70 includes the sound wave permeable waterproof membrane 71 and the first adhesive layer. (72) and a sponge layer (73). The sound wave permeable waterproof membrane 71 shields the sound wave inlet hole 20 in the transverse direction to prevent water from penetrating through the sound wave inlet hole 20 . The first adhesive layer 72 is located on the periphery and front side of the sound wave permeable waterproof membrane 71 and comes into contact with the rear surface of the front protection unit 10 .
이때, 스펀지층(73)은 음파 투과성 방수 멤브레인(71)의 후방측 주변부(제1 접착층 반대편)에 부착되고 기판(40)의 전면에 접촉되어 기판(40)의 가압에 의하여 눌리며 압축가능한 소재로 구성된다.At this time, the sponge layer 73 is attached to the periphery of the rear side of the sound wave permeable waterproof membrane 71 (opposite to the first adhesive layer) and contacts the front surface of the substrate 40 to be pressed by the pressure of the substrate 40. Compressible material consists of
도 4에 도시된 바와 같이, 방수수단부(70)는 스펀지층(73)의 후방측(제1 접착층(72) 반대편)에 기판(40)의 전면에 부착되는 제2 접착층(75)가 더 구비될 수 있다. 제2 접착층(75)에 의해 스펀지층(73)이 기판(40)의 전면에 부착된다. 방수수단부(60)의 음파 투과성 방수 멤브레인(61)의 두께는 0.005 ~ 0.02 mm인 것이 바람직함을 테스트 결과 알수 있었다. 0.005 mm 미만의 경우 제작에 어려움이 있으며 방수성이 약해지고, 0.02 mm 초과의 경우 방수성이 증가하지만 음파 투과성이 떨어지는 문제가 있다. As shown in FIG. 4, the waterproof unit 70 has a second adhesive layer 75 attached to the front surface of the substrate 40 on the rear side of the sponge layer 73 (opposite the first adhesive layer 72). may be provided. The sponge layer 73 is attached to the front surface of the substrate 40 by the second adhesive layer 75 . As a result of the test, it was found that the thickness of the sound wave permeable waterproof membrane 61 of the waterproof unit 60 is preferably 0.005 to 0.02 mm. If it is less than 0.005 mm, it is difficult to manufacture and waterproofness is weakened, and if it is more than 0.02 mm, waterproofness increases but sound wave permeability is poor.
방수 멤브레인은 원단은 코오롱머티리얼 (주소 : 대한민국 경기도 과천시 코오롱로 11 코오롱타워)사의 F69 MBR 원단을 주문하여 사용하였다.For the waterproof membrane, F69 MBR fabric from Kolon Materials (Address: Kolon Tower, 11 Kolon-ro, Gwacheon-si, Gyeonggi-do, Korea) was ordered and used.
음파 유입홀(20)들은, 외측 노출부의 폭(또는 직경)이 센서 인접부의 폭(또는 직경)과 같게 구성될 수 있다. 또는 센서 인접부로부터 외측 노출부로 갈수록 횡단면적이 넓어지는 확장형 형상으로 구성된다. 전방 보호부는 플라스틱 또는 금속 재질로 구성되고 사출 등의 형태로 생산된 후 절삭, 펀칭 가공에 의해 음파 유입홀(20)을 형성할 수 있다. In the sound wave inlet holes 20 , the width (or diameter) of the exposed portion may be the same as the width (or diameter) of the portion adjacent to the sensor. Alternatively, it is composed of an expandable shape in which the cross-sectional area becomes wider as it goes from the sensor adjacent portion to the outer exposed portion. The front protector may be made of plastic or metal, and after being produced in the form of injection, etc., the sound wave inlet hole 20 may be formed by cutting or punching.
전방 보호부(10)의 가로 크기 또는 세로 크기 중 하나의 크기는 5.0 ~ 50 cm 범위에 존재한다. 50 cm 이상의 경우 이동식으로 음향카메라를 구성하는 것이 부적당하다. 5 cm 이하의 경우 음향 센서의 수와 이격거리에 제한이 발생하는 문제점이 있다. 따라서, 5.0 ~ 50 cm 범위가 적당하며 더욱 바람직하게 7.5 ~ 35 cm 정도가 이동식 관점에서 바람직하다.One of the horizontal and vertical sizes of the front protector 10 is in the range of 5.0 to 50 cm. In case of more than 50 cm, it is inappropriate to construct a movable acoustic camera. In the case of less than 5 cm, there is a problem in that the number of acoustic sensors and the separation distance are limited. Therefore, the range of 5.0 to 50 cm is suitable, and more preferably about 7.5 to 35 cm is preferred from the viewpoint of mobility.
전방 보호부(10)는, 플라스틱 또는 금속 재질로 구성되고 평면(plane) 또는 노출측으로 볼록한 곡면 형상이며, 상기 음파유입홀(20)은 전방 보호부(10)에 관통되는 형상으로 10 ~ 300개가 구비되고, 하나의 음파유입홀(20)에 하나의 MEMS 마이크로폰(30)이 배치된다. 여기서, 음파 유입홀(20)의 수는 10 ~ 300개가 바람직한데, 10 개 미만인 경우 같은 크기의 기판에서 센서 들의 이격 거리가 커지고 음장 가시화 할 수 있는 주파수 상한계 제한되는 문제점이 발생한다. 300개 이상인 경우 취급 데이터 처리량이 필요 이상으로 증가하는 문제점이 발생하고 실제 10 ~ 20cm 음향(초음파) 카메라에서 센서 수가 필요 이상으로 많아 센서 간 이격 거리를 고려할 때 설치의 문제점이 발생한다. 10 ~ 300개가 바람직하며 5.0 ~ 50 cm 범위의 음향 또는 초음파 카메라에서 20 ~ 100개 정도가 더욱 바람직하다.The front protection unit 10 is made of plastic or metal material and has a plane or a curved surface convex to the exposure side, and the sound wave inlet hole 20 has a shape penetrating the front protection unit 10, and 10 to 300 , and one MEMS microphone 30 is disposed in one sound wave inlet hole 20 . Here, the number of sound wave inlet holes 20 is preferably 10 to 300, but if the number is less than 10, the separation distance between the sensors on the substrate of the same size increases and the upper limit of the frequency that can visualize the sound field occurs. In the case of more than 300, there is a problem that the handling data processing amount increases more than necessary, and in the actual 10 ~ 20cm acoustic (ultrasonic) camera, the number of sensors is more than necessary, which causes installation problems when considering the distance between sensors. 10 to 300 are preferable, and about 20 to 100 are more preferable in an acoustic or ultrasonic camera in the range of 5.0 to 50 cm.
상기 복수개의 MEMS 마이크로폰(30)들은 강성 또는 연성의 기판부(40)에 일체로 탑재된 상태에서, 상기 전방 보호부(10)와 기판부(40)가 일체로 결합함에 따라서, 상기 하나의 음파유입홀(20) 내측에 하나의 MEMS 마이크로폰(30)이 각각 상응하도록 위치한다.The plurality of MEMS microphones 30 are integrally mounted on a rigid or flexible substrate 40, and as the front protection unit 10 and the substrate 40 are integrally coupled, the single sound wave Inside the inlet hole 20, one MEMS microphone 30 is positioned to correspond to each.
<제2 실시예><Second Embodiment>
도 2b는 본 발명의 제2 실시예(음파유입홀 + 카운터보어 + 방수수단)에 따른 전방몸체 구성도이고, 도 3b는 본 발명의 제2 실시예에 따른 전방몸체 상세도이다.Figure 2b is a front body configuration diagram according to the second embodiment (sound wave inlet hole + counter bore + waterproofing means) of the present invention, Figure 3b is a detailed view of the front body according to the second embodiment of the present invention.
도 6(a, b, c)은 본 발명의 제2 실시예(음파유입홀 + 카운터보어 + 방수수단)에 따른 전방몸체, 방수수단부 및 기판 결합도(단면도, 단면 상세도), 도 7(a, b)은 본 발명의 제2 실시예(음파유입홀 + 카운터보어 + 방수수단)에 따른 전방몸체, 방수수단부 및 기판 결합도(a: 눌리기 전, b : 기판에 의해 눌린 후), 도 8(a, b, c, d)은 본 발명의 제2 실시예에 따른 카운터 보어를 갖는 전방몸체 후면 구성도(a :방수수단부 장착 전, b, c, d : 방수수단부 장착 후 기판 장착전)이다. Figure 6 (a, b, c) is a front body, waterproof means and substrate coupling (cross-sectional view, cross-sectional detail view) according to the second embodiment of the present invention (sound wave inlet hole + counterbore + waterproof means), Figure 7 (a, b) are the front body, waterproof means and substrate coupling (a: before being pressed, b: after being pressed by the substrate) according to the second embodiment of the present invention (sound wave inlet hole + counter bore + waterproof means) ), Figure 8 (a, b, c, d) is a configuration diagram of the back of the front body having a counter bore according to the second embodiment of the present invention (a: before mounting the waterproofing means, b, c, d: waterproofing means) after mounting and before board mounting).
도 2b, 도 3b, 도 6 내지 도 8에 도시된 바와 같이, 본 발명의 제2 실시예(음파유입홀 + 카운터보어 + 방수수단)에 따른 방수 수단이 구비된 음향 카메라는 전방보호부(10)의 후면중 음파유입홀(20) 형성 부위에 전방몸체 후면(10a)으로부터 단차지게 파여서 형성된 카운터 보어(15)가 더 형성된다. 방수수단부(60)는 카운터 보어(15)에 안치된다. 음파 투과성 방수 멤브레인(71)의 주변부는 제1 접착층(72)에 의해 카운터 보어(15, 단차진 홈)의 바닥면에 부착된다. As shown in FIGS. 2B, 3B, and 6 to 8, the acoustic camera equipped with the waterproof means according to the second embodiment (sound wave inlet hole + counterbore + waterproof means) of the present invention has a front protection unit 10 A counter bore 15 formed by stepwise digging from the rear surface of the front body 10a is further formed in the rear surface of the rear surface where the sound wave inlet hole 20 is formed. The waterproofing means 60 is placed in the counter bore 15. The periphery of the sound wave permeable waterproof membrane 71 is attached to the bottom surface of the counterbore 15 (stepped groove) by the first adhesive layer 72.
카운터 보어(15)는 전방으로 형성된 음파유입홀(20)의 반대편, 즉 전방보호부(10)의 후면 측에 전방측으로 내입되어 형성되는 단차진 홈, 납작한 원통형 형상의 홈일 수 있다. 카운터 보어(15)는 음파유입홀(20)의 후방과 연통된다. 카운터 보어(15)는 방수수단부(60)가 안치되는 공간을 제공하며 방수수단부(60) 설치 작업의 편리성을 제공한다. 카운터 보어(15)의 단턱은 방수수단부(60)의 횡방향 이탈을 방지한다. The counter bore 15 may be a stepped groove or a flat cylindrical groove formed by being inserted into the front side of the rear side of the front protection unit 10, that is, the opposite side of the sound wave inlet hole 20 formed in the front side. The counter bore 15 communicates with the rear of the sound wave inlet hole 20 . The counter bore 15 provides a space in which the waterproofing means 60 is placed and provides convenience in installing the waterproofing means 60 . The step of the counterbore 15 prevents the watertight means 60 from escaping in the lateral direction.
도 4a, 도 6b, 도 7a, 도 8(a, b, c, d)에 도시된 바와 같이, 기판(40)이 전방몸체와 조립에 의해 합체되기 전에 방수수단부(60)가 카운터 보어(15)에 위치되었을 때, 스펀지층(73)은 카운터 보어(15)의 후면보다 더 높게 후방으로 돌출된다. 그런 상태에서 도 7b와 같이, 기판(40)의 전면이 스펀지층(73)을 가압하면서 전방보호부(10)와 결합한다. 카운터 보어(15)의 깊이는 0.2 ~ 2 mm 인 것이 바람직하다. 카운터 보어(15)의 깊이가 0.2 mm 미만인 경우 방수수단부(60)의 횡방향 이탈이 발생할 수 있으며 카운터 보어(15)의 깊이가 2mm 초과인 경우 방수수단부(60)의 크기가 필요 이상으로 커지게 되는 문제가 있다.As shown in Figures 4a, 6b, 7a, and 8 (a, b, c, d), before the substrate 40 is combined with the front body by assembly, the waterproofing means portion 60 has a counter bore ( When positioned at 15), the sponge layer 73 protrudes rearwardly higher than the back surface of the counterbore 15. In such a state, as shown in FIG. 7B , the front surface of the substrate 40 presses the sponge layer 73 and is combined with the front protection unit 10 . The depth of the counter bore 15 is preferably 0.2 to 2 mm. When the depth of the counterbore 15 is less than 0.2 mm, the waterproofing means 60 may be laterally displaced, and when the depth of the counterbore 15 exceeds 2mm, the size of the waterproofing means 60 is larger than necessary. There is a growing problem.
도 2b, 도 3b, 도 6, 도 7, 도 8에 도시된 본 발명의 제2 실시예에서, 카운터 보어(15)의 깊이는 0.45mm 이고 스펀지층(73)을 포함하는 방수수단부(60)의 전체 높이는 0.66 mm이다. 스펀지층(73)은 기판(40)의 가압에 의하여 0.21mm 눌리면서 복원력을 갖게된다. 스펀지층(73)의 복원력에 의해 스펀지층(73)은 음파 투과성 방수 멤브레인(71)의 주변부를 카운터 보어(15, 단차진 홈)의 바닥면 또는 전방보호부(10)의 후면을 밀착시킨다. 이로 인하여 방수 멤브레인(71)의 분리, 이탈이 방지된다. 또한, 복원성을 갖는 가압된 스펀지층(73)이 방수 멤브레인(71)의 후방 주변부를 눌러줌으로 인하여 방수 멤브레인(71)의 전방 주변부와 전방보호부(10)의 후면(또는 카운터 보아 바닥면) 사이 빈틈(G1)을 통한 물의 유입이 차단된다. In the second embodiment of the present invention shown in FIGS. 2B, 3B, 6, 7, and 8, the depth of the counter bore 15 is 0.45 mm and the waterproofing means 60 including the sponge layer 73. ) is 0.66 mm. The sponge layer 73 has restoring force while being pressed by 0.21 mm by the pressure of the substrate 40 . Due to the restoring force of the sponge layer 73, the periphery of the sound wave permeable waterproof membrane 71 adheres to the bottom surface of the counter bore 15 (stepped groove) or the rear surface of the front protection unit 10. Due to this, the separation and separation of the waterproof membrane 71 is prevented. In addition, since the pressurized sponge layer 73 having resilience presses the rear periphery of the waterproof membrane 71, the front periphery of the waterproof membrane 71 and the rear surface of the front protection part 10 (or the bottom surface of the counter bore) Inflow of water through the gap G1 is blocked.
도 1에 도시된 바와 같이, 전방보호부(10) 또는 후방하우징(60)의 상부에 고정되어 상기 전방보호부(10)의 전면보다 전방으로 더 돌출되는 상부 돌출 커버부(80)를 더 포함할 수 있다. As shown in FIG. 1 , an upper protruding cover 80 which is fixed to the upper portion of the front protection unit 10 or the rear housing 60 and protrudes forward more than the front side of the front protection unit 10 is further included. can do.
도 2(a, b), 도 3(a, b)에 도시된 바와 같이, 음파유입홀(20)은 전방측(노출측)의 폭 또는 직경이 후방측(기판측)의 폭 또는 직경보다 더 크고, 후방측(기판측)에서 전방측(노출측)으로 갈수록 횡단면적이 연속적으로 넓어지는 확장형 형상으로 구성된다. 시그날 대 노이즈 비율(SNR) 테스트에서 음향 감지 성능상 우수함을 알수 있었다.2 (a, b) and 3 (a, b), the width or diameter of the front side (exposure side) of the sound wave inlet hole 20 is greater than the width or diameter of the rear side (substrate side). It is larger and is composed of an expandable shape in which the cross-sectional area continuously widens from the rear side (substrate side) to the front side (exposure side). In the signal-to-noise ratio (SNR) test, it was found that the sound detection performance was excellent.
도 9는 본 발명의 일실시예에 따른 전방몸체 및 기판 결합체 구성도이다. 기판(40)은 조립수단에 의해 전방보호부(10)와 결합한다.Figure 9 is a configuration diagram of the front body and substrate assembly according to an embodiment of the present invention. The substrate 40 is coupled to the front protection unit 10 by means of assembling means.
도 10은 본 발명의 음향 카메라에 대한 음향 성능 시험 방법 설명도이고, 도 11(a, b, c)는 본 발명의 비교예(확장형 음파유입홀, 방수 멤브레인 없슴), 실시예 1(확장형 음파유입홀 + 방수 멤브레인 있슴, 카운터 보어 없슴), 실시예 2(확장형 음파유입홀 + 방수멤브레인 았슴 + 카운터 보어 있슴)에 대한 음향 성능 시험 결과 그래프(a : SNR, b : MSL, c : BW)이다.10 is an explanatory view of the acoustic performance test method for the acoustic camera of the present invention, and FIG. 11 (a, b, c) is a comparative example of the present invention (extended sound wave inlet hole, no waterproof membrane), Example 1 (extended sound wave Acoustic performance test results graphs (a: SNR, b: MSL, c: BW) for Example 2 (extended sound wave inlet hole + waterproof membrane + counter bore) .
도 11a에서, 주파수 별 신호대 잡음비 측정 결과(SNR), 일반적으로 센서의 신호대잡음비가 높으면 성능이 우수하다고 판단하며, 보다 높은 SNR을 가지는 센서 또는 어레이가 보다 더 작은 소리까지 측정할 수 있다. 도 11a에서, SNR 성능의 경우 본 발명의 제1, 제2 실시예에 따른 방수 수단이 구비된 음향 카메라는 전반적으로 방수 수단이 부착되지 않은 기존의 음향 카메라(비교예)와 동일한 배열 센서 성능을 나타내며 20 kHz 이상 영역에서 동등하거나 보다 높은 성능을 나타내는 점을 확인하였다. In FIG. 11A, the signal-to-noise ratio measurement result (SNR) for each frequency is generally determined to be excellent when the signal-to-noise ratio of the sensor is high, and a sensor or array having a higher SNR can measure even smaller sounds. In FIG. 11A, in the case of SNR performance, the acoustic cameras equipped with the waterproof means according to the first and second embodiments of the present invention generally have the same array sensor performance as the existing acoustic camera (comparative example) without the waterproof means attached. It was confirmed that it showed equal or higher performance in the region of 20 kHz or higher.
도 11b에서, 주파수 별 최대 부엽 레벨 측정 결과 (MSL): 배열 센서의 대표적인 성능지표중 하나이며, MSL 높을수록 다양한 크기의 소음원들을 동시에 구분하는 성능이 좋아진다. 일반적으로 msl이 높을수록 좋은 성능의 배열센서이다. 도 11c에서, 주파수 별 3dB 빔폭 성능 측정 결과 (3dB bandwidth): 배열 센서의 대표적인 성능지표중 하나이며, 최대부엽의 레벨에서 -3dB 되는 위치의 빔폭을 계산하여 성능을 판단한다. 빔폭이 작을수록 가까이 있는 여러개의 소음원을 구별할 수 있는 성능이 좋아지며 일반적으로 3dB bandwidth가 작을수록 좋은 성능의 배열센서이다. 도 11b, 도 11c에서, MSL, BW 성능의 경우 본 발명의 제1, 제2 실시예에 따른 방수 수단이 구비된 음향 카메라는 방수 수단이 부착되지 않은 기존의 음향 카메라(비교예)와 성능 측면에서 큰 차이가 없음을 확인하였다.In FIG. 11B, the maximum side lobe level measurement result (MSL) for each frequency is one of the representative performance indicators of an array sensor, and the higher the MSL, the better the performance for simultaneously discriminating noise sources of various sizes. Generally, the higher the msl, the better the performance of the array sensor. 11c, 3dB beamwidth performance measurement result for each frequency (3dB bandwidth): This is one of the representative performance indicators of an array sensor, and the performance is determined by calculating the beamwidth at a position of -3dB at the maximum side lobe level. The smaller the beam width, the better the ability to distinguish several nearby noise sources. In general, the smaller the 3dB bandwidth, the better the performance of the array sensor. In FIGS. 11B and 11C , in the case of MSL and BW performance, the acoustic camera equipped with the waterproof means according to the first and second embodiments of the present invention has performance aspects compared to conventional acoustic cameras (comparative examples) without waterproof means attached. It was confirmed that there was no significant difference in
도 12는 본 발명의 방수 수단이 구비된 음향 카메라에 대한 침수 성능 시험 장면도(침수)이다. 침수 시험 결과 기판(40)에 물이 침투되지 않음을 확인하였다. 12 is a scene diagram (immersion) of a submersion performance test for an acoustic camera provided with a waterproofing means of the present invention. As a result of the immersion test, it was confirmed that water did not permeate the substrate 40 .
도 13(a, b, c)는 본 발명의 의 방수 수단이 구비된 음향 카메라에 대한 물 분사 방수 시험 방법 및 결과도(분사 장면, 시험 후 내부 확인 장면, 공인 성적서)이다. 물 분사 시험 조건은 아래와 같다. 13 (a, b, c) is a water spray waterproof test method and result diagram (spray scene, internal confirmation scene after test, certified test report) for a sound camera equipped with a waterproof means of the present invention. The water spray test conditions are as follows.
물 분사에 대한 보호Protection against water jets
시험 조건Exam conditions
노즐의 내부 지름 : 6.3mm / 방수율 : 12.5L/min ±5%Inside diameter of nozzle : 6.3mm / Water discharge rate : 12.5L/min ±5%
물 흐름의 중심 : 노즐로버터 2.5m 떨어진 약 40mm의 원Center of water flow: a circle of about 40 mm, 2.5 m away from the nozzle
노즐에서 외함 표면까지 거리 : 2.5~3mDistance from nozzle to enclosure surface: 2.5 to 3 m
시험 시간 : 외함 표면적 1m2당 1분으로 하여, 최소 시험시간 3분(시험 시간 : 3분)Test time: 1 minute per 1 m 2 of enclosure surface area, minimum test time 3 minutes (test time: 3 minutes)
도 13b와 같이, 물 분사 시험 결과 기판(40)에 물이 침투되지 않음을 확안하였다. As shown in FIG. 13B , it was confirmed that water did not permeate the substrate 40 as a result of the water spray test.
본 발명은 상기에서 언급한 바람직한 실시예와 관련하여 설명됐지만, 본 발명의 범위가 이러한 실시예에 한정되는 것은 아니며, 본 발명의 범위는 이하의 특허청구범위에 의하여 정하여지는 것으로 본 발명과 균등 범위에 속하는 다양한 수정 및 변형을 포함할 것이다.Although the present invention has been described in relation to the preferred embodiments mentioned above, the scope of the present invention is not limited to these embodiments, and the scope of the present invention is defined by the following claims, and the scope equivalent to the present invention It will contain various modifications and variations pertaining to.
아래의 특허청구범위에 기재된 도면부호는 단순히 발명의 이해를 보조하기 위한 것으로 권리범위의 해석에 영향을 미치지 아니함을 밝히며 기재된 도면부호에 의해 권리범위가 좁게 해석되어서는 안될 것이다.The reference numerals described in the claims below are merely to aid understanding of the invention and do not affect the interpretation of the scope of rights, and the scope of rights should not be interpreted narrowly by the reference numerals described.
본 발명에 따르는 경우, 음향 감지 성능이 우수하면서 실내가 아닌 야외 장소에서 설치 또는 이동식 사용이 가능하도록 방수 기능을 구비한 음향 카메라가 제공된다.According to the present invention, an acoustic camera having excellent sound sensing performance and having a waterproof function is provided so that it can be installed or used in a mobile environment instead of indoors.

Claims (10)

  1. 음파 또는 초음파가 MEMS 마이크로폰(30)에 도달하도록 유도하는 복수개의 음파유입홀(20)들이 구비된 전방보호부(10)와;a front protection unit 10 equipped with a plurality of sound wave inlet holes 20 for inducing sound waves or ultrasonic waves to reach the MEMS microphone 30;
    기판(substrate, 40)에 고정된 상태에서 상기 전방보호부(10)의 음파유입홀(20)들을 통하여 유입되는 음파를 감지하는 상기 MEMS 마이크로폰(30)들과;The MEMS microphones 30 that detect sound waves introduced through the sound wave inlet holes 20 of the front protection unit 10 while being fixed to a substrate 40;
    상기 MEMS 마이크로폰(20)들이 장착되는 기판(40)과;a substrate 40 on which the MEMS microphones 20 are mounted;
    상기 전방보호부(10)가 향하고 있는 장면을 영상으로 촬영하는 촬영수단(50)과;a photographing means (50) for photographing a scene toward which the front protection unit (10) is facing;
    상기 전방보호부(10)의 후면측에 상기 기판(40)이 위치된 상태에서 전방보호부(10)의 후방을 커버하는 후방하우징(60)과;a rear housing 60 covering the rear of the front protection unit 10 in a state where the substrate 40 is positioned on the rear side of the front protection unit 10;
    물이 상기 음파유입홀(20)를 통하여 MEMS 마이크로폰(30) 또는 기판(40)에 도달하는 것을 방지하는 방수수단부(70);를 포함하여 구성되는 것을 특징으로 하는 방수 수단이 구비된 방수 수단이 구비된 음향 카메라.A waterproof means having a waterproof means, characterized in that it is configured to include; Acoustic camera equipped with this.
  2. 제1항에 있어서,According to claim 1,
    상기 방수수단부(60)는 음파유입홀(20)을 통하여 물이 침투하지 못하도록 음파유입홀(20)을 횡방향으로 차폐하는 음파 투과성 방수 멤브레인(61)을 포함하고,The waterproof means unit 60 includes a sound wave permeable waterproof membrane 61 that shields the sound wave inlet hole 20 in the transverse direction so that water does not penetrate through the sound wave inlet hole 20,
    음파 투과성 방수 멤브레인(61)의 위치는, 음파 투과성 방수 멤브레인(61)은 전방보호부(10)의 전면, 상기 음파유입홀(20)의 중간지점(음파유입홀 전단부과 후단부 사이 지점), 또는 상기 전방보호부(10)의 후면과 기판(40)의 전면 사이에 구비되는 것을 특징으로 하는 방수 수단이 구비된 음향 카메라.The position of the sound wave permeable waterproof membrane 61 is the front of the front protection unit 10, the midpoint of the sound wave inlet hole 20 (a point between the front and rear ends of the sound wave inlet hole), Alternatively, the sound camera provided with a waterproof means, characterized in that provided between the rear surface of the front protection unit (10) and the front surface of the substrate (40).
  3. 제2항에 있어서,According to claim 2,
    상기 방수수단부(60)는 상기 전방보호부(10)의 후면과 기판(40)의 전면 사이에 구비되는 것을 특징으로 하는 방수 수단이 구비된 음향 카메라.The waterproofing unit 60 is provided between the rear surface of the front protection unit 10 and the front surface of the substrate 40, characterized in that the sound camera equipped with waterproofing unit.
  4. 제2항에 있어서,According to claim 2,
    상기 음파유입홀(20)은The sound wave inlet hole 20 is
    전방측(노출측)의 폭 또는 직경이 후방측(기판측)의 폭 또는 직경보다 더 크고, 후방측(기판측)에서 전방측(노출측)으로 갈수록 횡단면적이 연속적으로 넓어지는 확장형 형상으로 구성되는 것을 특징으로 하는 방수 수단이 구비된 음향 카메라.It is an expandable shape in which the width or diameter of the front side (exposed side) is larger than that of the rear side (substrate side), and the cross-sectional area continuously widens from the rear side (substrate side) to the front side (exposed side). An acoustic camera equipped with a waterproof means, characterized in that configured.
  5. 제3항 또는 제4항에 있어서,According to claim 3 or 4,
    상기 방수수단부(70)는,The waterproofing means part 70,
    상기 음파유입홀(20)을 횡으로 차폐하는 음파 투과성 방수 멤브레인(71)과,A sound wave permeable waterproof membrane 71 that horizontally shields the sound wave inlet hole 20;
    상기 음파 투과성 방수 멤브레인(71)의 주변부 및 전방측에 위치하여 상기 전방보호부(10)의 후면 또는 카운터 보어(15) 바닥면에 접면되는 제1 접착층(72)과,A first adhesive layer 72 located on the periphery and front side of the sound wave permeable waterproof membrane 71 and in contact with the rear surface of the front protection part 10 or the bottom surface of the counter bore 15,
    상기 음파 투과성 방수 멤브레인(71)의 후방측 주변부(제1 접착층 반대편)에 부착되고 상기 기판(40)의 전면에 접촉되어 눌리는(가압되는) 압축가능한 스펀지층(73)으로 구성되는 것을 특징으로 하는 방수 수단이 구비된 음향 카메라.It is composed of a compressible sponge layer 73 attached to the rear side periphery of the sound wave permeable waterproof membrane 71 (opposite to the first adhesive layer) and pressed (pressurized) in contact with the front surface of the substrate 40. Acoustic camera with waterproofing means.
  6. 제5항에 있어서,According to claim 5,
    상기 전방보호부(10)의 음파유입홀(20) 형성 부위에 전방몸체 후면으로부터 단차지게 형성된 카운터 보어(15)가 더 형성되고,A counter bore 15 formed stepwise from the rear surface of the front body is further formed in the area where the sound wave inlet hole 20 of the front protection unit 10 is formed,
    상기 방수수단부(60)는 상기 카운터 보어(15)에 안치되고,The waterproofing means part 60 is placed in the counter bore 15,
    상기 제1 접착층(72)은 카운터 보어(15) 바닥면에 접면되는 것을 특징으로 하는 방수 수단이 구비된 음향 카메라. The first adhesive layer (72) is a sound camera with a waterproof means, characterized in that in contact with the bottom surface of the counter bore (15).
  7. 제1항에 있어서,According to claim 1,
    상기 방수수단부(60)의 음파 투과성 방수 멤브레인(61)의 두께는 0.005 ~ 0.02 mm The thickness of the sound wave permeable waterproof membrane 61 of the waterproof means part 60 is 0.005 to 0.02 mm
    것을 특징으로 하는 방수 수단이 구비된 음향 카메라. An acoustic camera equipped with a waterproof means, characterized in that.
  8. 제5항에 있어서,According to claim 5,
    상기 방수수단부(70)는,The waterproofing means part 70,
    상기 스펀지층(73)의 후방측(제1 접착층(72) 반대편)에 기판(40)의 전면 부착되는 제2 접착층(75)이 더 구비되는 것을 특징으로 하는 방수 수단이 구비된 음향 카메라.A sound camera with waterproof means, characterized in that a second adhesive layer 75 attached to the front surface of the substrate 40 is further provided on the rear side of the sponge layer 73 (opposite the first adhesive layer 72).
  9. 제6항에 있어서,According to claim 6,
    상기 카운터 보어(15)의 깊이는 0.2 ~ 2 mm 인 것을 특징으로 하는 방수 수단이 구비된 음향 카메라. The depth of the counter bore (15) is 0.2 ~ 2 mm, characterized in that the acoustic camera equipped with a waterproof means.
  10. 제1항에 있어서,According to claim 1,
    상기 전방보호부(10) 또는 후방하우징(60)의 상부에 고정되어 상기 전방보호부(10)의 전면보다 전방으로 더 돌출되는 상부 돌출 커버부(80);를 더 포함하는 것을 방수 수단이 구비된 방수 수단이 구비된 음향 카메라.The upper protruding cover part 80 is fixed to the upper part of the front protection part 10 or the rear housing 60 and protrudes forward more than the front surface of the front protection part 10; Acoustic camera equipped with waterproof means.
PCT/KR2022/011725 2021-08-18 2022-08-07 Acoustic camera having waterproof means WO2023022418A1 (en)

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KR1020210108416A KR102566117B1 (en) 2021-08-18 2021-08-18 acoustic camera with horn type structure for receiving acoustic wave
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KR1020210134561A KR20230051746A (en) 2021-10-11 2021-10-11 acoustic camera with horn type structure for receiving acoustic wave

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Citations (5)

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JPH08294026A (en) * 1995-04-21 1996-11-05 Mitsubishi Electric Corp Image pickup device for monitor
KR20140121623A (en) * 2013-04-08 2014-10-16 싸니코전자 주식회사 Mems microphone having multiple sound pass hole
KR101471300B1 (en) * 2013-08-19 2014-12-10 (주)에스엠인스트루먼트 Portable Acoustic Camera
JP2019083479A (en) * 2017-10-31 2019-05-30 キヤノン株式会社 Microphone holding structure
KR20200056413A (en) * 2017-09-19 2020-05-22 더블유.엘. 고어 앤드 어소시에이트스, 인코포레이티드 Acoustic protective cover comprising a curable support layer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08294026A (en) * 1995-04-21 1996-11-05 Mitsubishi Electric Corp Image pickup device for monitor
KR20140121623A (en) * 2013-04-08 2014-10-16 싸니코전자 주식회사 Mems microphone having multiple sound pass hole
KR101471300B1 (en) * 2013-08-19 2014-12-10 (주)에스엠인스트루먼트 Portable Acoustic Camera
KR20200056413A (en) * 2017-09-19 2020-05-22 더블유.엘. 고어 앤드 어소시에이트스, 인코포레이티드 Acoustic protective cover comprising a curable support layer
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