Audio camera with explosion-proof mechanism or waterproof mechanism

Abstract

The audio camera having an explosion-proof mechanism or a waterproof mechanism according to one embodiment of the present invention is characterized by comprising: an audio sensor that senses audio and generates an input audio signal; a barrier circuit unit that receives the input audio signal and generates an output audio signal, and that receives an input clock and generates an output clock; and a main control section that receives and processes the output audio signal and applies the input clock to the barrier circuit section, in which the barrier circuit section generates the output audio signal by limiting the input audio signal within an audio signal allowable value, the output clock is generated and sent to the audio sensor by limiting the input clock within a clock allowable value.

Description

Technical Field

[0001] The present invention relates to an audio camera having an explosion-proof mechanism or a waterproof mechanism. Background Art

[0002] Authorized Patent No. 10-1471299 discloses a mobile audio camera, including: a front body that disposes an audio sensing unit of an audio sensor forward; an audio sensor that exposes the audio sensing unit while being fixed to a substrate; a substrate for mounting a plurality of audio sensors; a photographing unit that exposes a photographing lens through a lens hole of the front body; and a rear body that surrounds the rear sides of the sensor substrate and the photographing unit.

[0003] Since it is necessary to sense audio through an audio sensing hole, the microphones mounted on the substrate in an array form must be exposed to the air environment of the sensing object.

[0004] At this time, the microphones and the microphone connection circuits are simultaneously in contact with and exposed to the air environment of the sensing object.

[0005] When the audio camera is installed in a flammable gas environment with a high explosion risk, the power supply, electronic circuits, etc. of the audio camera may pose an explosion hazard.

[0006] In addition, for barriers using fuses, Zener diodes, and resistors, there is a problem that the number of components increases more than four times compared to digital barriers, and signal distortion occurs when the communication speed exceeds a certain level, making it inapplicable to high-speed systems.

[0007] Authorized Patent No. 10-1213540 discloses an audio camera using an audio sensor array, including: an audio sensing device configured on a circuit board to send sensed audio-related signals to a data collection unit; a data collection unit connected to the audio sensing device to sample and convert an analog signal related to audio sent by the audio sensor into a digital signal related to audio and send it to a central processing unit; and a central processing unit that calculates a noise level related to each audio sensor based on the digital signal related to audio sent from the audio sensor.

[0008] For an audio camera, since the audio sensor needs to be exposed to the air, a groove is formed in front of the sensor. Summary of the Invention

[0009] Technical Problem

[0010] The present invention aims to provide an audio camera having an explosion-proof structure that restricts electric energy to prevent ignition in a dangerous atmosphere caused by electric sparks, electric arcs, or high temperatures generated during the normal operation and failure (open circuit, short circuit, etc.) of the audio camera.

[0011] In addition, it is intended to provide an audio camera having a pressure-resistant explosion-proof structure such that the influence of an explosion (fire-causing factor) inside the housing of the audio camera of the present invention does not transfer to the air or flammable gas outside the housing.

[0012] In addition, it is intended to provide an audio camera having a pressure-resistant explosion-proof structure with a photo-coupler arranged on a barrier circuit section, such that the number is reduced by one-fourth compared to an analog barrier, while solving the problem of signal distortion occurring when the communication speed exceeds a certain level and the existing audio cameras with explosion-proof structures not being applicable to high-speed systems.

[0013] In addition, the present invention is intended to provide an audio camera having waterproof performance such that the audio sensing performance is excellent and it can be installed or used for mobile purposes in outdoor sites other than indoors.

[0014] Technical Solution

[0015] The present invention provides an audio camera having an explosion-proof structure that restricts electric energy to prevent electric sparks, electric arcs, or high temperatures generated during the normal operation and failure (open circuit, short circuit, etc.) of the audio camera from being ignited in a hazardous atmosphere.

[0016] In addition, there is provided an audio camera having a pressure-resistant explosion-proof structure such that the influence of an explosion (fire-causing factor) inside the housing of the audio camera of the present invention does not transfer to the air or flammable gas outside the housing.

[0017] In addition, there is provided an audio camera having a pressure-resistant explosion-proof structure with a photo-coupler arranged on a barrier circuit section, such that the number is reduced by one-fourth compared to an analog barrier, while solving the problem of signal distortion generated when the communication speed exceeds a certain level and the existing audio cameras with explosion-proof structures not being applicable to high-speed systems.

[0018] In addition, the present invention provides an audio camera having waterproof performance such that the audio sensing performance is excellent and it can be installed or used for mobile purposes in outdoor sites other than indoors.

[0019] Technical Effects

[0020] According to the present invention, there is provided an audio camera having an explosion-proof structure that restricts electric energy to prevent electric sparks, electric arcs, or high temperatures generated during the normal operation and failure (open circuit, short circuit, etc.) of the audio camera from being ignited in a hazardous atmosphere.

[0021] In addition, according to the present invention, there is provided an audio camera having a pressure-resistant explosion-proof structure such that the influence of an explosion (fire-causing factor) inside the housing of the audio camera of the present invention does not transfer to the air or flammable gas outside the housing.

[0022] In addition, provided is an audio camera with a voltage-resistant explosion-proof structure in which an optocoupler is disposed on a barrier circuit unit, reducing the number by a quarter compared to an analog barrier, and simultaneously solving the problem of signal distortion generated when the communication speed exceeds a certain level and the problem of an existing audio camera with an explosion-proof structure that cannot be applied to a high-speed system.

[0023] In addition, according to the present invention, provided is an audio camera with waterproof performance, having excellent audio sensing performance and being installable or movable for use in outdoor sites other than indoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an overall configuration diagram of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention;

[0025] Figure 2 is a cross-sectional view of an audio camera with an explosion-proof mechanism according to an embodiment of the present invention;

[0026] Figure 3a is a detailed diagram of a barrier circuit unit of a resistor, a Zener diode, and a fuse in a first barrier PCB region according to an embodiment of the present invention;

[0027] Figure 3b is a detailed diagram of a barrier circuit unit of a barrier PCB according to an embodiment of the present invention;

[0028] Figure 4 is an internal detailed diagram of an optocoupler of a barrier PCB according to an embodiment of the present invention;

[0029] Figure 5a is a plan view of a first barrier PCB region of a barrier circuit unit according to an embodiment of the present invention;

[0030] Figure 5b is a bottom view of a first barrier PCB region of a barrier circuit unit according to an embodiment of the present invention;

[0031] Figure 6a is a plan view of a second barrier PCB region of a barrier circuit unit according to an embodiment of the present invention;

[0032] Figure 6b is a bottom view of a second barrier PCB region of a barrier circuit unit according to an embodiment of the present invention;

[0033] Figure 7 is a gas ignition curve for explaining the effect of an audio camera with an explosion-proof mechanism according to an embodiment of the present invention;

[0034] Figure 8aBottom perspective view of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention;

[0035] Figure 8b Front external view of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention;

[0036] Figure 8c Rear external view of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention;

[0037] Figure 9a Cross-sectional view of an epoxy resin molding according to an embodiment of the present invention;

[0038] Figure 9b Detailed cross-sectional view of an epoxy resin molding according to an embodiment of the present invention;

[0039] Figure 9c Detailed cross-sectional view for showing the needle configuration of an epoxy resin molding according to an embodiment of the present invention;

[0040] Figure 10 Detailed view for showing the separation distance of an audio sensor and the sensor substrate of a needle insertion part according to an embodiment of the present invention;

[0041] Figure 11a 、 Figure 11b 、 Figure 11c Detailed view of a front body according to an embodiment of the present invention;

[0042] Figure 12 Detailed cross-sectional view for showing the camera epoxy resin molding part of a front body according to an embodiment of the present invention;

[0043] Figure 13 Rear external view of a front body according to an embodiment of the present invention;

[0044] Figure 14 External view of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention;

[0045] Figure 15a 、 Figure 15b External view of a line bushing of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention;

[0046] Figure 16 Conceptual illustration of an audio camera with an explosion-proof mechanism according to an embodiment of the present invention;

[0047] Figure 17It is a conceptual illustration showing the number of audio cameras with an explosion-proof mechanism according to an embodiment of the present invention;

[0048] Figure 18a It is a detailed cross-sectional view of the waterproof mechanism part (before and after being pressed by the substrate) according to an embodiment of the present invention;

[0049] Figure 18b It is a combined view of the front body, the waterproof mechanism part, and the substrate according to an embodiment of the present invention (sound inlet groove + waterproof mechanism);

[0050] Figure 18c It is a combined view (cross-sectional view, detailed cross-sectional view) of the front body, the waterproof mechanism part, and the substrate according to an embodiment of the present invention (sound inlet groove + waterproof mechanism), and it is a schematic diagram of the sound inlet groove;

[0051] Figure 18d 、 Figure 18e It is a combined view (cross-sectional view, detailed transverse cross-sectional view) of the front body, the waterproof mechanism part, and the substrate according to an embodiment of the present invention (sound inlet groove + counterbore + waterproof mechanism);

[0052] Figure 18f It is a combined view of the front body, the waterproof mechanism part, and the substrate according to an embodiment of the present invention (sound inlet groove + counterbore + waterproof mechanism) (a: before being pressed by the substrate, b: after being pressed by the substrate);

[0053] Figure 19a 、 Figure 19b 、 Figure 19c It is a rear view composition diagram of the front body according to an embodiment of the present invention (sound inlet groove + counterbore + waterproof mechanism) (a: before attaching and installing the waterproof mechanism part, b: after attaching the waterproof mechanism part);

[0054] Figure 20 It is an explanatory diagram of the audio performance test method for the audio camera according to an embodiment of the present invention;

[0055] Figure 21a 、 Figure 21b 、 Figure 21c It is a graph showing the audio performance test results of the comparative example (without an extended sound inlet groove, waterproof film), Example 1 (with an extended sound inlet groove + waterproof film, without a counterbore), and Example 2 (with an extended sound inlet groove + waterproof film + counterbore) of the present invention (a: SNR, b: MSL, c: BW);

[0056] Figure 22 It is a graph showing the immersion test results of the audio camera with the waterproof mechanism of the present invention;

[0057] Figure 23 It is a diagram of the water spray waterproof test and results for an audio camera with the waterproof mechanism of the present invention.

[0058] Explanation of reference numerals

[0059] 10: Front body 10b: Front cover part

[0060] 10b(1): Front cover fixing bolt 11: Sound inlet groove

[0061] M: Audio sensor 12: Upper convex cover part

[0062] 13: Computation and processing unit 20: Sensor substrate

[0063] 21: PCB sound inlet hole 22: Molded connector

[0064] 22a: Camera epoxy molding part 22b: Camera module end cover

[0065] 23: Epoxy coating 24: Needle

[0066] 25: Needle plug-in 30a: Camera lens part

[0067] 30b: Camera body part 30c: FFC cable

[0068] 35: Tempered glass 40: Housing

[0069] 41a: Shooting hole 42: Rear wall part

[0070] 43: Side wall part 50: Main control unit

[0071] 60: Barrier circuit unit 60a: Resistor

[0072] 60b: Fuse 60c: Zener diode

[0073] 60d: Opto-coupler 60e: Capacitor

[0074] 60f(1): First power supply 60f(2): Second power supply

[0075] 60f(3): Third power supply 60f(4): Fourth power supply

[0076] 60f(5): Fifth power supply 60f(6): Sixth power supply

[0077] 61: Data collection unit 62a: First barrier PCB area

[0078] 62b: Second barrier PCB area 70: Terminal

[0079] 71: Terminal block 72: Line bushing

[0080] 73: Splitter 74: Cable Connector

[0081] 80: Mounting Bracket 81: System Connector

[0082] 82: Heater Power Connector 90: Waterproof Mechanism Part

[0083] 91: Sound-Permeable Waterproof Film 92: First Adhesive Layer

[0084] 93: Intermediate Adhesive Layer 94: Sponge Layer

[0085] 95: Second Adhesive Layer 96: Countersunk Hole Detailed Implementation Manner

[0086] Next, an audio camera having an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0087] The structure of an audio camera having an explosion-proof mechanism according to an embodiment of the present invention includes an intrinsically safe explosion-proof structure, a pressure-resistant explosion-proof structure, and an increased safety explosion-proof structure.

[0088] Intrinsically safe explosion-proof structure

[0089] The intrinsically safe explosion-proof structure is an explosion-proof structure that prevents the electric flame, electric arc, or high temperature generated during normal operation and in case of failure from igniting in the risk atmosphere by restricting electric energy.

[0090] The intrinsically safe explosion-proof structure is characterized by being designed considering the failure conditions of the equipment.

[0091] If the explosion-proof camera is only configured as pressure-resistant explosion-proof, there is a problem that the audio sensor does not transmit sound. Therefore, it can be configured as intrinsically safe explosion-proof to solve this problem.

[0092] Pressure-resistant explosion-proof structure

[0093] The pressure-resistant explosion-proof structure refers to a structure in which the container is designed to withstand the explosion pressure and prevent the explosion flame from spreading to the outside of the container.

[0094] The pressure-resistant explosion-proof structure is an explosion-proof structure that recognizes the explosion inside the container and the ignition source inside the container.

[0095] The reference of the equipment temperature class indicates the surface temperature outside the container, and changes in the shape, arrangement, volume, etc. of the internal components of the equipment may affect the explosion pressure.

[0096] The change in the heat generation amount caused by the electrical rating of the internal components of the equipment may affect the equipment temperature class.

[0097] Preferably, it is prohibited to arbitrarily replace or change the internal components of the equipment of the pressure-resistant explosion-proof structure container.

[0098] Increased safety explosion-proof structure

[0099] The increased safety explosion-proof structure increases safety against machinery, electricity, and temperature rise to prevent structures such as electric sparks, electric arcs, or high-temperature parts.

[0100] The increased safety explosion-proof structure does not recognize ignition sources and prevents fires from occurring.

[0101] Moreover, it monitors the temperature rise (such as overload) and improves the insulation performance.

[0102] The temperature class is based on the highest surface temperature inside and outside the container, the rated load at equipment startup, overload, and the limit temperature of the insulation coil.

[0103] Overall structure

[0104] Figure 1 It is the overall configuration diagram of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0105] Figure 2 It is a sectional view of an audio camera with an explosion-proof mechanism according to an embodiment of the present invention.

[0106] As Figure 1 shown, an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention includes a front body part, a housing part, a terminal 70, and a waterproof mechanism part 90.

[0107] Specifically, the front body part includes a front body 10, an audio sensing part, a photographing part, and a pressure-resistant explosion-proof part in the front body 10.

[0108] The audio sensing part includes a sensor substrate 20; an audio sensor M, located behind the sensor substrate 20, for sensing audio to generate an input audio signal; a sound inlet groove 11, located at the front end of the front body 10, for audio to enter; and a PCB sound inlet hole 21, formed in the audio sensor M.

[0109] The sound waves entering through the sound inlet groove 11 and the PCB sound inlet hole 21 can be sensed by the audio sensor M.

[0110] The photographing part includes a camera lens part 30a, a camera body part 30b, a shooting hole 41a, and tempered glass 35.

[0111] The photography department includes: a camera lens unit 30a, located at the central part of the front body 10; a tempered glass 35, located in front of the camera lens unit 30a to protect the camera lens unit 30a; a shooting hole 41a, formed at the center of the front body 10 to enable the insertion of the tempered glass 35; and a camera body unit 30b, connected to the camera lens unit 30a through an FFC cable 30c and located on the rear wall part 42 side of the housing 40.

[0112] The pressure-resistant and explosion-proof part in the front body includes: a front cover part 10b, located at the front ends of the front body 10 and including front cover fixing bolts 10b(1); a camera epoxy molding part 22a, located at the rear end of the camera lens unit 30a and including a wire fixing device; and a molded connector 22, connecting the front body 10 and the housing 40.

[0113] Specifically, the housing part includes a housing 40, a barrier circuit part 60, a data processing module, and a line bushing 72.

[0114] The barrier circuit part 60 receives an input audio signal generated by the audio sensor M and generates an output audio signal.

[0115] The barrier circuit part 60 receives an input clock generated by the main control part 50 and generates an output clock.

[0116] The barrier circuit part 60 includes a first barrier PCB area 62a and a second barrier PCB area 62b.

[0117] The first barrier PCB area 62a includes a resistance 60a; a fuse 60b; a zener diode 60c, and an opto-coupler 60d.

[0118] The second barrier PCB area 62b includes an opto-coupler 60d.

[0119] The data processing module is located in the built-in space of the housing 40.

[0120] The data processing module includes a main control part that receives and processes the output audio signal and applies an input clock to the barrier circuit part 60.

[0121] The data processing module includes: a data collection unit (DAQ) 61, which is located inside the main control unit 50, receives and processes the input audio signal (e.g., PDM signal (Pulse Density Module)) generated by the audio sensor M via the barrier circuit unit 60, and applies an input clock to the audio sensor M via the barrier circuit unit 60; a splitter 73, which constitutes the main control unit 50; a calculation processing unit 13, which is interconnected with the main control unit; and a line bushing 72, which is connected to the splitter 73.

[0122] Specifically, the terminal 70 includes a terminal block 71 and a cable connector 74.

[0123] The waterproof mechanism unit 90 includes a sound-permeable waterproof film 91; a first adhesive layer 92; an intermediate adhesive layer 93; a sponge layer 94; a second adhesive layer 95 and a countersunk hole 96.

[0124] Front body part

[0125] Front body

[0126] Figure 1 is an overall configuration diagram of an audio camera having an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0127] Figure 8a is a bottom perspective view of an audio camera having an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0128] Figure 8b is an external front view of an audio camera having an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0129] Figure 9b is a detailed cross-sectional view of epoxy resin molding according to an embodiment of the present invention.

[0130] Figure 14 is an external view of an audio camera having an explosion-proof or waterproof mechanism according to an embodiment of the present invention.

[0131] As Figure 8a shown, the front body 10 of the audio camera having an explosion-proof mechanism or a waterproof mechanism is made of plastic or metal material and has a curved surface shape protruding toward the exposed side.

[0132] The audio camera having an explosion-proof mechanism or a waterproof mechanism may further include a mounting bracket 80.

[0133] The front body 10 is located at the front end of the audio camera having an explosion-proof mechanism.

[0134] As Figure 1 、 Figure 8b and Figure 9bAs shown, a shooting hole 41a is provided in the center of the front body 10, and the tempered glass 35 is closed by the shooting hole 41a.

[0135] In addition, either the horizontal size or the vertical size of the front body 10 includes a size belonging to the range of 5.0 cm to 50 cm.

[0136] If the mobile audio camera exceeds 50 cm, the mobility will be significantly reduced. Therefore, it is preferably configured within the range of 50 cm or less.

[0137] When it is less than or equal to 5 cm, there is a problem that the number and spacing of the audio sensors are restricted.

[0138] Therefore, considering the mobility, the range of 5.0 to 50 cm is appropriate, and more preferably about 7.5 to 35 cm.

[0139] As Figure 14 shown, it may further include an upper convex cover portion 12, which is fixed to the top of the front body 10 or the housing 40 and protrudes more forward than the front surface of the front body 10.

[0140] Audio sensing unit

[0141] Sound inlet groove

[0142] Figure 1 is an overall configuration diagram of an audio camera having an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0143] Figure 11a 、 Figure 11b 、 Figure 11c is a detailed view of the front body according to an embodiment of the present invention.

[0144] Figure 18c is a combined view (cross-sectional view, detailed cross-sectional view) of the front body, the waterproof mechanism portion, and the substrate according to an embodiment of the present invention (sound inlet groove + waterproof mechanism), and is a schematic diagram of the sound inlet groove.

[0145] As Figure 1 、 Figures 11a to 11c shown, preferably, the audio camera having an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention further includes a front body 10, and the front body 10 has a plurality of sound inlet grooves 11 for guiding sound waves or ultrasonic waves to the audio sensor M.

[0146] As shown in the figure, the width (or diameter) of the outer exposed portion in the sound inlet groove 11 may be equal to the width (or diameter) of the sensor adjacent portion.

[0147] Alternatively, it may also be configured in an expanding shape in which the cross-sectional area gradually widens from the sensor adjacent portion to the outer exposed portion.

[0148] As Figure 18c shown, when the audio enters from the entrance of the sound inlet groove 11, the inner curved surface of the sound inlet groove 11 guides the audio.

[0149] Therefore, the sound inlet groove 11 has the effect of guiding the audio while introducing the audio.

[0150] The front body 10 is made of plastic or metal material and can be produced in the form of injection molding and then formed into the sound inlet groove 11 through cutting, punching, and processing.

[0151] According to an embodiment of the present invention, the sound inlet groove 11 is provided in a shape penetrating the front body 10, and the number is 10 to 300.

[0152] One sound inlet groove 11 of the front body 10 and one PCB sound inlet hole 21 of the sensor substrate 20 are combined face to face and communicatively at corresponding positions.

[0153] In addition, one sound inlet groove 11 of the front body 10 and one PCB sound inlet hole 21 of the audio sensor M are combined face to face and communicatively at corresponding positions.

[0154] The intrinsically safe explosion-proof structure is an explosion-proof structure used to limit electrical energy to prevent ignition in a hazardous environment due to electric sparks, arcs, or high temperatures generated during normal operation and in case of failure.

[0155] The intrinsically safe explosion-proof structure may include the following, that is, the preferred number of the sound inlet grooves 11 is prompted.

[0156] As Figures 11a to 11c shown, the number of the sound inlet grooves 11 is preferably 10 to 300.

[0157] If it is less than 10, the separation distance between the audio sensors M will become larger, resulting in a problem of limiting the upper frequency limit for sound field visualization.

[0158] If it exceeds 300, there will be a problem that the processing amount of data increases beyond the necessary amount.

[0159] In addition, if the separation distance between the sensors is considered, there will be problems that the radius, width, and size of the sensor substrate become too large, which will cause problems of increased installation complexity and decreased mobility.

[0160] Therefore, the number of the sound inlet grooves 11 is preferably 10 to 300, and more preferably about 20 to 100 on an audio or ultrasonic camera within the range of 5.0 to 50 cm.

[0161] PCB sound inlet hole

[0162] As Figure 1As shown, the PCB sound inlet hole 21 is in the form of a groove that is recessed in the sensor substrate 20 and the audio sensor M.

[0163] The intrinsically safe explosion-proof structure is an explosion-proof structure used to limit electrical energy to prevent ignition in a hazardous environment due to electric sparks, arcs, or high temperatures generated during normal operation and in case of failure.

[0164] The intrinsically safe explosion-proof structure may include the following, namely, suggesting the preferred number of PCB sound inlet holes 21.

[0165] The number of the sound inlet grooves 11 is preferably between 10 and 300.

[0166] If it is less than 10, the separation distance between the audio sensors M will become larger, resulting in a problem of limiting the upper frequency limit for acoustic field visualization.

[0167] If it exceeds 300, there will be a problem that the amount of data to be processed increases beyond the necessary amount.

[0168] In addition, if the separation distance between the sensors is considered, there will be a problem that the radius, width, and size of the sensor substrate become too large, which will cause problems of increased installation complexity and decreased mobility.

[0169] Since the PCB sound inlet hole 21 corresponds to the sound inlet groove 11 of the front body 10, the number of the PCB sound inlet holes 21 corresponds to the preferred number of the sound inlet grooves 11, so the preferred number is 10 to 300.

[0170] When audio enters the sound inlet groove 11, the entering audio enters along the curved surface inside the sound inlet groove 11 and then enters the PCB sound inlet hole 21.

[0171] The audio sensor M senses the audio entering the PCB sound inlet hole 21 and generates an input audio signal.

[0172] The generated input audio signal is sent to the barrier circuit unit 60 through the audio signal transmission line.

[0173] Sensor substrate

[0174] Figure 1 is the overall configuration diagram of an audio camera having an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0175] Figure 10 is a detailed diagram of the sensor substrate for showing the separation distance of the audio sensor according to an embodiment of the present invention.

[0176] The intrinsically safe explosion-proof structure is an explosion-proof structure used to limit electrical energy to prevent ignition in a hazardous environment due to electric sparks, arcs, or high temperatures generated during normal operation and in case of failure.

[0177] The intrinsically safe explosion-proof structure may include the following, namely, the preferred separation distance of the prompt audio sensor M.

[0178] Such as Figure 1 and Figure 10 As shown, according to an embodiment of the present invention, in a state where a plurality of audio sensors M are soldered and connected to the back of a rigid or flexible sensor substrate 20, one audio sensor M is respectively located inside one sound inlet groove 11.

[0179] The sensor substrate 20 includes a PCB sound inlet hole 21 in the form of a groove with a recessed indentation.

[0180] The sensor substrate 20 is located inside the front body 10.

[0181] Preferably, the audio sensors M mounted on the sensor substrate 20 are configured to have a separation distance of 1.5 mm or more (exceeding) from each other.

[0182] In the case of less than 1.5 mm, it is possible to prevent the aggregation of heat generated by the mutual approach of the audio sensors M and the electric energy that increases the explosion risk.

[0183] Audio sensor

[0184] The intrinsically safe explosion-proof structure is an explosion-proof structure used to limit electric energy to prevent being ignited in a dangerous environment due to electric sparks, electric arcs or high temperatures generated during normal operation and in case of failure.

[0185] The intrinsically safe explosion-proof structure may include the following, namely, the preferred number of the prompt audio sensors M, the preferred separation distance of the prompt audio sensors M, or the value for prompting to limit the power supply of the audio sensors M.

[0186] Such as Figure 11a As shown, the number of the sound inlet grooves 11 is preferably 10 to 300.

[0187] If it is less than 10, the separation distance of the audio sensors M will become larger, resulting in the problem of limiting the upper frequency limit for sound field visualization.

[0188] If it exceeds 300, there will be a problem that the processing amount of data increases to more than the necessary amount.

[0189] In addition, if the separation distance between the sensors is considered, there will be problems that the radius, width and size of the sensor substrate become too large, resulting in an increase in the complexity of installation and a decrease in mobility.

[0190] The number of the sound inlet grooves 11 corresponds to the number of the audio sensors M, so 10 to 300 (N) audio sensors M can be configured.

[0191] Preferably, 112 audio sensors M are configured.

[0192] According to an embodiment of the present invention, when audio is introduced into the sound slot 11, the introduced audio enters along the curved surface inside the audio inflow slot 11 and then enters the PCB sound inlet hole 21.

[0193] Based on the audio entering the PCB sound inlet hole 21, the audio sensor M creates an input audio signal and sends the created input audio signal to the barrier circuit unit 60.

[0194] According to an embodiment of the present invention, the power supply of the audio sensor M is 3.3V.

[0195] Tests show that even when the power of the audio sensor M is extended to the range of 1 - 5V, the digital limit is still effective from the perspective of explosion protection.

[0196] It can be seen that within the numerical range, the explosion risk of the audio camera is significantly reduced in highly explosive environments such as hydrogen.

[0197] According to an embodiment of the present invention, when the current exceeds the ignition curve, intrinsic safety cannot be achieved.

[0198] The audio camera with an explosion protection mechanism is targeted at gas group IIC, which consists of gas vapors and acetylene hydrogen.

[0199] The intrinsic safety explosion protection structure of the audio camera with an explosion protection mechanism operates below 10V. Therefore, targeting gas group IIC, intrinsic safety can be achieved when the current is within 2A.

[0200] However, the audio camera with an explosion protection mechanism operates below 10V and less than or equal to 0.5A, so it can achieve intrinsic safety.

[0201] Photography unit

[0202] Figure 1 is the overall composition diagram of an audio camera with an explosion protection mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0203] Figure 2 is the cross-sectional view of an audio camera with an explosion protection mechanism according to an embodiment of the present invention.

[0204] The pressure-resistant explosion protection structure refers to a structure in which the container is designed to resist the explosion pressure and prevent the explosion flame from spreading outside the container.

[0205] The pressure-resistant explosion protection structure may include the following, that is, due to the structure of the camera epoxy molding part 22a and the tempered glass 35, when an explosion occurs inside the housing, a structure that prevents the flame from spreading to the outside.

[0206] As Figure 1 and Figure 2 shown, the camera lens unit 30a is located behind the tempered glass 35, protected by the tempered glass 35, and connected to the rear direction of the front body 10, allowing the FFC cable 30c to pass through the camera epoxy molding unit 22a.

[0207] The shooting hole 41a closes the tempered glass 35, and the camera lens unit 30a and the tempered glass 35 are fixed together inside the shooting hole 41a.

[0208] The camera epoxy molding unit 22a is located behind the camera lens unit 30a. The camera epoxy molding unit 22a, like the molding connector 22, is filled with epoxy cement to prevent the flame from spreading to the outside when an explosion occurs inside the housing.

[0209] The tempered glass 35 can ensure that when an explosion occurs inside the housing, the flame will not spread to the outside.

[0210] Preferably, the molded length of the front part of the tempered glass 35 is 3 mm or more or the volume does not exceed 10 cm 3 .

[0211] The FFC cable 30c connected to the rear of the camera lens unit 30a passes through the camera epoxy molding unit 22a and is connected to the camera body unit 30b located on the rear wall side inside the housing.

[0212] Front body to pressure-resistant explosion-proof part

[0213] Front cover part

[0214] Figure 1 is the overall configuration diagram of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0215] Figure 13 is the external rear view of the front body according to an embodiment of the present invention.

[0216] As Figure 1 and 13 shown, the front body 10 and the housing 40 are connected by the front cover fixing bolts 10b(1) of the front cover part 10b.

[0217] The front cover fixing bolts 10b(1) of the front cover part 10b connect the front body 10 and the housing 40 to apply the pressure-resistant explosion-proof technology of the housing 40 to the front body 10.

[0218] The audio camera with an explosion-proof mechanism or a waterproof mechanism preferably includes 10 front cover parts 10b and front cover fixing bolts 10b(1).

[0219] Molding connector

[0220] Figure 9a is a cross-sectional view of an epoxy molding according to an embodiment of the present invention.

[0221] Figure 9b is a detailed cross-sectional view of an epoxy molding according to an embodiment of the present invention.

[0222] Figure 9c is a detailed cross-sectional view for showing the needle configuration of an epoxy molding according to an embodiment of the present invention.

[0223] Figure 10 is a detailed view for showing the separation distance of an audio sensor and the sensor substrate of the needle insertion part according to an embodiment of the present invention.

[0224] As Figures 9a to 9c shown, a molding connector 22 connects a front body 10 and a housing 40.

[0225] The front body 10 is characterized in that one end of the molding connector 22 facing the audio sensor M is located at the outer part in the radial direction with respect to the central axis, while the other end of the molding connector 22 facing the barrier circuit part 60 is located at the inner part in the radial direction with respect to the central axis.

[0226] A pressure-resistant explosion-proof structure refers to a structure in which a container is designed to resist explosion pressure and prevent the spread of explosion flames to the outside of the container.

[0227] The pressure-resistant explosion-proof structure may include the following, namely, an epoxy coating structure of the molding connector 22.

[0228] The epoxy molding structure functions to prevent the leakage of explosion residues to the outside.

[0229] According to an embodiment of the present invention, the molding connector 22 is coated with an epoxy coating 23, thereby having excellent electrical insulation safety, good adhesion, high hardness and excellent rigidity, high thermal conductivity and low expansion coefficient.

[0230] According to an embodiment of the present invention, due to the high water resistance generated by the epoxy coating 23, the molding connector 22 absorbs only a very small amount of water, and thus has excellent water resistance.

[0231] It can be designed such that even in the case of an explosion inside the housing 40, the influence of the explosion inside the housing 40 will not affect the front body 10 due to the excellent electrical insulation safety and excellent rigidity of the molding connector 22.

[0232] As Figure 9c 、 Figure 10 shown, the molding connector 22 includes a pin header 24.

[0233] The pin header 24 is inserted into the pin insertion portions 25 located on both sides of the sensor substrate 20.

[0234] Camera epoxy molding part

[0235] Figure 12 is a detailed sectional view showing the camera epoxy molding part of the front body according to an embodiment of the present invention.

[0236] As Figure 12 shown, the FFC cable 30c connected to the camera lens part 30a is connected to the housing 40 after passing through the camera epoxy molding part 22a.

[0237] The camera epoxy molding part 22a undergoes epoxy molding treatment, which is very effective for pressure resistance and explosion protection.

[0238] The camera epoxy molding part 22a wraps the FFC cable 30c with epoxy molding, thereby protecting the FFC cable 30c and the camera lens part 30a even when an explosion occurs inside the housing 40.

[0239] As shown in the figure, the periphery of the FFC cable 30c is completely filled with epoxy molding, and the filled epoxy molding extends to the camera epoxy molding part 22a, so it is very effective for pressure explosion protection.

[0240] The camera module end cap 22b is located behind the camera epoxy molding part 22a, finishes the rear of the camera epoxy molding part 22a, is fixed to prevent epoxy from dripping, and separates the pressure resistance explosion protection structure and the intrinsic safety explosion protection structure.

[0241] Housing part

[0242] Housing

[0243] In an audio camera having an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention, the housing 40 is located behind the front body 10.

[0244] In addition, the housing 40 further includes a front partition portion 41 located behind the sensor substrate 20.

[0245] The housing 40 includes a rear wall portion 42, a side wall portion 43, and a front partition portion 41 that form an internal space blocked from the outside.

[0246] The sensor substrate 20 is located in front of the front partition portion 41 which is the outside of the housing 40.

[0247] The camera body portion 30b is located in the internal space of the housing 40.

[0248] A pressure-resistant explosion-proof structure refers to a structure in which a container is designed to resist explosion pressure and prevent the spread of explosion flames to the outside of the container.

[0249] The pressure-resistant explosion-proof structure may include a design in which the housing partition portions 41, 42, and 43 have a pressure-resistant explosion-proof structure.

[0250] Even if an explosion occurs inside the housing 40, the pressure-resistant explosion-proof structure will not cause a fire.

[0251] Therefore, high-voltage devices such as a data acquisition unit (DAQ) 61, a main control unit 50, and a splitter 73 are built inside the housing with a pressure-resistant explosion-proof structure.

[0252] The camera body portion 30b is also located inside the housing 40, so even if the camera body portion 30b explodes, it will not cause a fire.

[0253] The pressure-resistant explosion-proof structure is characterized in that a plurality of cables are molded through thread processing.

[0254] Barrier circuit section

[0255] Figure 3a It is a detailed diagram of the barrier circuit section of the resistor, Zener diode, and fuse in the first barrier PCB area according to an embodiment of the present invention.

[0256] Figure 3b It is a detailed diagram of the barrier circuit section of the barrier PCB according to an embodiment of the present invention.

[0257] Figure 4 It is an internal detailed diagram of the optocoupler of the barrier PCB according to an embodiment of the present invention.

[0258] Figure 5aIt is a plan view of the first barrier PCB area of the barrier circuit unit according to an embodiment of the present invention.

[0259] Figure 5b It is a bottom view of the first barrier PCB area of the barrier circuit unit according to an embodiment of the present invention.

[0260] Figure 6a It is a plan view of the second barrier PCB area of the barrier circuit unit according to an embodiment of the present invention.

[0261] Figure 6b It is a bottom view of the second barrier PCB area of the barrier circuit unit according to an embodiment of the present invention.

[0262] Figure 16 It is a conceptual explanatory diagram of an audio camera with an explosion-proof mechanism according to an embodiment of the present invention.

[0263] As Figure 16 shown, an audio camera with an explosion-proof mechanism according to an embodiment of the present invention includes a structure in which a sensor substrate 20 is located in a hazardous area (intrinsic safety explosion-proof structure), a main control unit 50 is located in a safe area (pressure-resistant explosion-proof structure), and a barrier circuit unit 60 connects the sensor substrate 20 in the hazardous area (intrinsic safety explosion-proof structure) and the main control unit 50 in the safe area (pressure-resistant explosion-proof structure).

[0264] As Figure 3a 、 Figure 3b 、 Figure 4 、 Figure 5a 、 Figure 5b 、 Figure 6a and Figure 6b shown, for explosion-proofing an audio camera, intrinsic safety technology is required, and high-speed sampling is required for the audio sensor M to obtain data.

[0265] In the process of sending sampling data from the intrinsic safety structure to the pressure-resistant explosion-proof structure, a barrier circuit unit 60 forms an opto-coupler 60d to achieve high-speed communication.

[0266] According to an embodiment of the present invention, when the barrier circuit unit 60 is configured in a digital manner and passes through an opto-coupler 60d, the input and output are physically separated, so high-speed communication is achieved by transmitting an electrical signal through light.

[0267] In addition, a stable connection can also be provided between the intrinsic safety structure and the pressure-resistant explosion-proof structure.

[0268] This structure of the opto - coupler 60d with physically separated input and output makes the pressure - proof explosion - proof more effective by separating the intrinsically safe structure from the pressure - proof explosion - proof structure.

[0269] As shown in the figure, the intrinsically safe explosion - proof structure includes a resistance 60a for suppressing the current rise on the transmission line, a zener diode 60c for suppressing the voltage rise on the transmission line, and a fuse 60b for blocking the over - current on the transmission line. The transmission line is an audio signal transmission line for transmitting the input audio signal generated by the opto - coupler 60d and the audio sensor M of the barrier circuit section 60 or a clock signal transmission line for transmitting a clock signal.

[0270] The intrinsically safe explosion - proof structure is an explosion - proof structure used to limit electrical energy to prevent ignition in a hazardous environment due to electric sparks, arcs, or high temperatures generated during normal operation and in case of failure.

[0271] Figure 18c It is a combined drawing (sectional view, detailed sectional view) of the front body, the waterproof mechanism section, and the substrate according to an embodiment of the present invention (sound inlet groove + waterproof mechanism), and is a schematic diagram of the sound inlet groove.

[0272] As Figure 18c shown, when audio enters the sound inlet groove 11, the entering audio enters along the curved surface inside the audio inflow groove 11 and then enters the PCB sound inlet hole 21.

[0273] The audio sensor M generates an input audio signal based on the audio input to the PCB sound inlet hole 21 and sends the generated input audio signal to the barrier circuit section 60.

[0274] The output audio signal through the barrier circuit section 60 includes a signal not exceeding 3.3V.

[0275] As Figure 1 shown, the barrier circuit section 60 makes the input audio signal generated by the audio sensor M into an output audio signal and then sends it in the direction of the data acquisition unit (DAQ) 61.

[0276] The barrier circuit section 60 sends the output audio signal to the data acquisition unit (DAQ) 61 that constitutes the main control section 50.

[0277] The barrier circuit section 60 can suppress the rise of current and voltage on the audio signal transmission line for sending the output audio signal.

[0278] According to an embodiment of the present invention, the clock runs from the data acquisition unit (DAQ) 61 to the audio sensor M.

[0279] When an input clock is applied to the barrier circuit section, an output clock is generated by the barrier circuit section.

[0280] The output clock from the barrier circuit section 60 includes a clock not exceeding 3.3V.

[0281] The barrier circuit section 60 uses a dual or triple zener diode 60c that constitutes the barrier circuit section 60 to limit the voltage on the clock signal transmission line, uses a resistance 60a to limit the current on the clock signal transmission line, and uses a fuse 60b to block an abnormal power supply that is difficult for the zener diode 60c to handle.

[0282] As shown in the figure, in order to make a circuit connection between the audio sensor M and the data acquisition unit (DAQ) 61, the barrier circuit section 60 is located between the audio sensor M and the data acquisition unit (DAQ) 61.

[0283] As shown in the figure, the data acquisition unit (DAQ) 61 that constitutes the main control section 50 sends the input clock from non-intrinsically safe to the intrinsically safe direction through an opto-coupler 60d to apply the output clock from the barrier circuit section 60 to a plurality of audio sensors M.

[0284] The barrier circuit section 60 reconstructs the input audio signal (PDM, pulse density module signal) generated by the audio sensor M into an output audio signal through 56 opto-couplers 60d and sends it from the intrinsically safe type to the data acquisition unit (DAQ) 61 that constitutes the non-intrinsically safe (main control section 50).

[0285] According to an embodiment of the present invention, the barrier circuit section 60 allows normal low-energy signals to pass through, and limits signals with an abnormal high energy level within the allowable value in the dangerous area and then allows them to pass through.

[0286] The barrier circuit section 60 uses a dual or triple zener diode 60c that constitutes the barrier circuit section 60 to limit the voltage, uses a resistance 60a to limit the current, and uses a fuse 60b to block an abnormal power supply that is difficult for the zener diode 60c to handle.

[0287] As Figure 5a 、 Figure 5b 、 Figure 6a and Figure 6b shown, the barrier PCB area of the barrier circuit section includes a first barrier PCB area 62a and a second barrier PCB area 62b.

[0288] The first barrier PCB area 62a includes a resistance 60a, a zener diode 60c, a fuse 60b, and an opto - coupler 60d. The second barrier PCB area 62b includes an opto - coupler 60d.

[0289] The first barrier PCB area 62a includes 28 opto - couplers 60d.

[0290] The second barrier PCB area contains 29 opto - couplers 60d.

[0291] Therefore, the barrier circuit section 60 in total contains 57 opto - couplers 60d.

[0292] According to an embodiment of the present invention, the functions of the first barrier PCB area 62a include blocking abnormal power from entering the intrinsically safe when an abnormal power supply is input and configuring the clock and audio signals to not exceed 3.3V to suit the intrinsically safe.

[0293] Figure 3a It is a detailed diagram of the barrier circuit section of the resistance, zener diode, and fuse in the first barrier PCB area 62a according to an embodiment of the present invention.

[0294] Figure 3b It is a detailed diagram of the barrier circuit section of the barrier PCB on the first barrier PCB area 62a and the second barrier PCB area 62b according to an embodiment of the present invention.

[0295] The main control section 50 is Figure 3a and Figure 3b powered by the first power supply 60f(1) and the fourth power supply 60f(4) as shown, provides an output clock with a predetermined allowable value not exceeding 3.3V to the audio sensor M via the barrier circuit section 6, and collects the input audio signal generated by the audio sensor M as an output audio signal with a predetermined allowable value not exceeding 3.3V via the barrier circuit section 6.

[0296] When powered by the main control section 50, the powered first power supply 60f(1) becomes a second power supply 60f(2) suitable for intrinsic safety through a barrier composed of a fuse 60b, a zener diode 60c, and a resistance 60a located above the left side of the first barrier PCB area 62a in the barrier PCB area.

[0297] The second power supply 60f(2) supplies power to the fifth power supply 60f(5) and the sixth power supply 60f(6) of the audio sensor M.

[0298] In addition, the second power supply 60f(2) also supplies power to the third power supply 60f(3) of the opto - coupler 60d.

[0299] The fourth power supply 60f(4) of the opto - coupler 60d is directly supplied with power by the main control unit 50.

[0300] When the input clock sent by the data acquisition unit (DAQ) 61 that constitutes the main control unit 50 passes through the opto - coupler 60d, an output clock signal is generated that has the same waveform as required by the intrinsically safe explosion - proof structure but a newly generated predetermined allowable value not exceeding 3.3V, and the changed output clock signal with a predetermined allowable value not exceeding 3.3V is supplied to the audio sensor M.

[0301] However, the clock signal value of the present invention is not limited to the above - mentioned allowable value.

[0302] When an input audio signal enters the audio sensor M, it is changed to an output audio signal through the opto - coupler 60d.

[0303] The output audio signal, as a signal required for the explosion - proof structure with a withstand voltage not exceeding 3.3V, is changed to a newly generated output audio signal with the same waveform.

[0304] When it passes through the opto - coupler 60d and is changed to an output audio signal with a predetermined allowable value not exceeding 3.3V, the data acquisition unit (DAQ) 61 that constitutes the main control unit 50 receives the output audio signal.

[0305] Figure 17 It is a conceptual explanatory diagram for explaining the quantity of the audio camera with an explosion - proof mechanism according to an embodiment of the present invention.

[0306] As Figure 17 shown, the audio camera with an explosion - proof mechanism or a waterproof mechanism according to an embodiment of the present invention includes 112 audio sensors M, a total of 57 opto - couplers 60d, 1 resistance 60a, 1 fuse 60b respectively, 2 zener diodes 60c, and the resistance 60a, the fuse 60b and the zener diode 60c are configured as one group.

[0307] Data processing module

[0308] Figure 1 It is an overall composition diagram of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0309] As Figure 1 shown, the barrier circuit unit 60 constitutes the main control unit 50.

[0310] Based on the output audio signal sent from the barrier circuit unit 60 to the data acquisition unit (DAQ) 61, the main control unit 50 calculates at least one audio parameter required for sound field visualization (for example, the beam power level at a certain point on the virtual plane).

[0311] According to an embodiment of the present invention, the main control unit 50 and the data acquisition unit (DAQ) 61 perform beamforming.

[0312] In addition, the main control unit 50 converts the generated audio parameters into a color image, and superimposes the optical image generated by the camera body unit 30b and the audio color image generated by the operation output audio signal to generate a photoacoustic superimposed image.

[0313] As shown in the figure, the main control unit 50 is located inside the housing 40.

[0314] The frequency band analyzed and processed (beamforming and sound field visualization) by the main control unit 50 belongs to the range of 2 kHz to 48 kHz.

[0315] However, the frequency band analyzed and processed by the main control unit 50 is not limited to the range of 2 kHz to 48 kHz.

[0316] Line bushing

[0317] Figure 1 It is an overall composition diagram of an audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0318] Figure 15a 、 Figure 15b It is an external view of the line bushing of an audio camera with an explosion-proof or waterproof mechanism according to an embodiment of the present invention.

[0319] The pressure-resistant explosion-proof structure refers to a structure in which the container is designed to resist the explosion pressure and prevent the explosion flame from spreading outside the container.

[0320] As shown in the following figure, the pressure-resistant explosion-proof structure may include a structure in which the line bushing 72 is epoxy-molded.

[0321] As Figure 1 、 Figure 15a 、Figure 15b As shown, the function of the line bushing 72 of the audio camera with an explosion-proof or waterproof mechanism according to an embodiment of the present invention includes withstanding the explosion pressure when an explosion occurs inside the housing 40, preventing the flame from passing through the increased safety explosion protection.

[0322] The inside of the line bushing 72 is treated with epoxy resin molding, so it has strong pressure resistance and explosion protection, and plays a role in gathering multiple cables.

[0323] The line bushing 72 passes through the rear wall portion 42 of the housing 40 and is connected to the front end of the terminal 70 to connect the cable.

[0324] Terminal

[0325] Figure 8c It is an external rear view of the audio camera with an explosion-proof mechanism or a waterproof mechanism according to an embodiment of the present invention.

[0326] As Figure 8c shown, the cable connector 74 of the terminal 70 is composed of a system connector 81 and a heater power connector 82.

[0327] The terminal 70 is characterized by having an increased safety explosion-proof structure, and for this reason, the terminal block 71 conforms to the specifications of the increased safety explosion-proof structure.

[0328] In addition, the terminal block 71 plays a role in preventing the high-voltage cables constituting the pressure-resistant explosion-proof structure from being exposed to the outside.

[0329] In addition, the terminal 70 is characterized in that there is a large spacing between components to provide increased safety explosion protection.

[0330] According to an embodiment of the present invention, the cable connected through the system connector 81 passes through the terminal block 71 and then through the line bushing 72, and is connected to the splitter 73 connected to the main control unit 50.

[0331] The cable passing through the line bushing 72 passes through the system connector 81 which is one of the cable connectors 74 of the terminal 70, passes through the terminal block 71, then passes through the line bushing 72, and is connected to the splitter 73 connected to the main control unit 50.

[0332] Waterproof mechanism part

[0333] Figure 18a It is a detailed sectional view of the waterproof mechanism part according to an embodiment of the present invention (before and after being pressed by the substrate).

[0334] Figure 18b It is a combined view (sectional view, detailed sectional view) of the front body, waterproof mechanism part and substrate according to an embodiment of the present invention (sound inlet groove + waterproof mechanism).

[0335] Figure 18c It is a combined drawing (cross-sectional view, detailed cross-sectional view) of the front body, the waterproof mechanism part, and the substrate according to an embodiment of the present invention (sound inlet groove + waterproof mechanism), and it is a schematic diagram of the sound inlet groove.

[0336] Figure 18d 、 Figure 18e It is a combined drawing (cross-sectional view, detailed cross-sectional view) of the front body, the waterproof mechanism part, and the substrate according to an embodiment of the present invention (sound inlet groove + countersunk hole + waterproof mechanism).

[0337] Figure 18f It is a combined drawing of the front body, the waterproof mechanism part, and the substrate according to an embodiment of the present invention (sound inlet groove + countersunk hole + waterproof mechanism) (a: before being pressed by the substrate, b: after being pressed by the substrate).

[0338] As Figures 18a to 18f shown, the sound wave passes through the sound-permeable waterproof film 91 and propagates along the direction of the substrate, but water does not pass through the sound-permeable waterproof film 91.

[0339] The sound-permeable waterproof film 91 can be located in front of the front body 10 or at the middle position of the sound inlet groove 11 (the position between the front end part and the rear end part of the sound inlet groove).

[0340] According to an embodiment of the present invention, when the sound-permeable waterproof film 91 is located at the middle position (the position between the front end part and the rear end part of the sound inlet groove), the inner wall part of the sound inlet groove 11 can be separately manufactured and assembled after inserting the sound-permeable waterproof film 91.

[0341] As shown in the figure, the audio sensor M attached to the sensor substrate 20 is disposed opposite to the sound inlet groove 11 and the waterproof mechanism part 90 at corresponding positions.

[0342] The waterproof mechanism part 90 can be composed of the sound-permeable waterproof film 91, the first adhesive layer 92, and the sponge layer 94.

[0343] The first adhesive layer 92 is located at the peripheral part and the front side of the sound-permeable waterproof film 91 and contacts the rear surface of the front body 10.

[0344] Here, the sponge layer 94 includes a material that is attached to the rear side of the sound-permeable waterproof film 91 (opposite to the first adhesive layer), contacts the front surface of the sensor substrate 20, and can be compressed after being pressed by the sensor substrate 20.

[0345] As Figure 18a shown, the waterproof mechanism part 90 can further include a second adhesive layer 95 that is attached to the front surface of the sensor substrate 20 located at the rear side of the sponge layer 94 (opposite to the first adhesive layer 92).

[0346] The sponge layer 94 is attached to the front surface of the sensor substrate 20 through the second adhesive layer 95.

[0347] The thickness of the sound-transmitting waterproof film 91 of the waterproof mechanism portion 90 is preferably 0.005 to 0.02 mm.

[0348] There are problems as follows: when it is less than 0.005 mm, it is difficult to manufacture and the waterproof property is weakened; when it exceeds 0.02 mm, the waterproof property increases, but the sound wave permeability is weakened.

[0349] The fabric of the sound-transmitting waterproof film 91 according to an embodiment of the present invention uses F69 MBR ordered from Kolon Materials (address: Kolon Building, 11 Kolon Road, Gwacheon-si, Gyeonggi-do, Korea).

[0350] As Figures 18d to 18f shown, the audio camera having a waterproof mechanism is further formed with a counter bore 96 which is formed in a stepped shape by being dug from the back surface of the front body 10.

[0351] The waterproof mechanism portion 90 is disposed in the counter bore 96.

[0352] According to an embodiment of the present invention, the peripheral portion of the sound-transmitting waterproof film 91 is attached to the bottom surface of the counter bore 96 through the first adhesive layer 92.

[0353] According to an embodiment of the present invention, the counter bore 96 may be opposite to the sound inlet groove 11 formed forward, that is, a stepped groove or a flat cylindrical groove formed by pressing from the rear side to the front side of the front body 10.

[0354] The counter bore 96 communicates with the rear portion of the sound inlet groove 11.

[0355] The counter bore 96 provides a space for disposing the waterproof mechanism portion 90 and provides convenience for the installation work of the waterproof mechanism portion 90.

[0356] The flange of the counter bore 96 prevents the lateral detachment of the waterproof mechanism portion 90.

[0357] Figure 19a 、 Figure 19b 、 Figure 19c are the rear configuration diagrams of the front body according to an embodiment of the present invention (sound inlet groove + counter bore + waterproof mechanism) (a: before attaching the waterproof mechanism portion, b: after attaching the waterproof mechanism portion).

[0358] As Figures 18a to 18f and Figure 19a 、Figure 19b , Figure 19c As shown in Figure 19c , before the sensor substrate 20 is assembled with the front body 10, when the waterproof mechanism portion 90 is located in the counter bore 96, the sponge layer 94 protrudes rearward and is higher than the rear surface of the counter bore 96.

[0359] In this state, as Figure 18f shown in Figure 18f , while pressing the sponge layer 94 on the front surface of the sensor substrate 20, it is combined with the front body 10.

[0360] The depth of the counter bore 96 is preferably 0.2 to 2 mm.

[0361] If the depth of the counter bore 96 is less than 0.2 mm, lateral detachment of the waterproof mechanism portion 90 may occur. If the depth of the counter bore 96 is greater than 2 mm, there is a problem that the size of the waterproof mechanism portion 90 is larger than the required size.

[0362] In Figure 18a an embodiment of the present invention shown in Figure 18a , the depth of the counter bore 96 is 0.45 mm, and the total height of the waterproof mechanism portion 90 including the sponge layer 94 is 0.66 mm.

[0363] The sponge layer 94 is pressed down by 0.21 mm by the pressure of the sensor substrate 20 and obtains a restoring force at the same time.

[0364] The sponge layer 94 tightly attaches the peripheral portion of the sound-transmitting waterproof film 91 to the bottom surface of the counterbore 96 or the rear surface of the front body 10 through its restoring force.

[0365] Thereby, separation and detachment of the sound-transmitting waterproof film 91 are prevented.

[0366] In addition, the pressurized sponge layer 94 with a restoring force presses the rear peripheral portion of the sound-transmitting waterproof film 91, thereby preventing water from entering through the gap between the front peripheral portion of the sound-transmitting waterproof film 91 and the rear surface of the front body 10 (or the bottom surface of the counter bore 96).

[0367] Figure 20 It is an explanatory diagram of the audio performance test method of the audio camera of the present invention.

[0368] Figure 21a , Figure 21b , Figure 21cIt is a graph showing the audio performance test results of the comparative example (without an extended sound inlet groove and waterproof film), Example 1 (with an extended sound inlet groove + waterproof film, without a countersunk hole), and Example 2 (with an extended sound inlet groove + waterproof film + with a countersunk hole) of the present invention (a: SNR, b: MSL, c: BW).

[0369] As Figure 20 shown, (a) represents the performance test status diagram, and (b) represents the audio camera.

[0370] As Figure 21a shown, it is the measurement result of the signal-to-noise ratio (SNR) at each frequency. Generally speaking, the higher the signal-to-noise ratio of the sensor, the better the performance is judged. A sensor or array with a higher SNR can measure smaller sounds.

[0371] In addition, it was confirmed that in terms of SNR performance, the audio camera with a waterproof mechanism according to an embodiment of the present invention exhibits overall the same array sensor performance as the conventional audio camera without the attached waterproof mechanism, and the performance in the region above 20 kHz is the same or higher.

[0372] In Figure 21b it, the measurement result of the maximum sidelobe level (MSL) at each frequency: is one of the representative performance indicators of the array sensor. The higher the MSL, the stronger the ability to simultaneously distinguish noise sources of different sizes.

[0373] Generally speaking, the higher the MSL, the higher the performance of the array sensor.

[0374] In Figure 21c it, the performance measurement result of the 3dB beamwidth at each frequency (3dB bandwidth): is one of the representative performance indicators of the array sensor. The performance is judged by calculating the beamwidth at the position where the maximum sidelobe level reaches -3dB.

[0375] The smaller the beamwidth, the stronger the ability to distinguish multiple noise sources at close range. Generally speaking, the smaller the 3dB bandwidth, the better the performance of the array sensor.

[0376] From Figure 21b and Figure 21c it was confirmed that in terms of MSL and BW performance, there is no significant difference in performance between the audio camera with a waterproof mechanism according to an embodiment of the present invention and the conventional audio camera without the attached waterproof mechanism.

[0377] Figure 22 It is a diagram showing the immersion test results of the audio camera with a waterproof mechanism of the present invention.

[0378] As Figure 22As shown, (a) the immersion test was conducted with the internal components removed, and as a result of the immersion test on the audio camera with the waterproof mechanism of the present invention, it was confirmed that (b) the substrate of the sensor (20) was not penetrated by water.

[0379] Figure 23 It is a water spray waterproof test and result diagram of the audio camera with the waterproof mechanism of the present invention.

[0380] The water spray test conditions are as follows:

[0381] Water spray protection

[0382] Test conditions

[0383] Nozzle inner diameter: 6.3 mm / Waterproof rate: 12.5 liters per minute ± 5%

[0384] Center of water flow: A circle with a diameter of approximately 40 mm at a distance of 2.5 meters from the nozzle

[0385] Distance from the nozzle to the outer shell surface: 2.5 - 3 m

[0386] Test time: 1 minute per 1 m² of the outer shell surface area, and the minimum test time is 3 minutes (test time: 3 minutes) 2 For 1 minute, the minimum test time is 3 minutes (test time: 3 minutes)

[0387] As Figure 23 shown, from the results of the water spray test, it was confirmed that the sensor substrate 20 did not get water seepage after the test (b) and inside after the test (c).

[0388] Although the present invention has been described in connection with the foregoing preferred embodiments, the scope of the present invention is not limited to these embodiments. The scope of the present invention is determined by the patent claims hereinafter, and thus will include various modifications and variations that fall within the equivalent scope of the present invention.

[0389] It is hereby declared that the reference numerals recorded in the appended claims are only for helping to understand the present invention, do not affect the interpretation of the scope of rights, and should not be used to narrowly interpret the scope of rights based on the recorded reference numerals.

Claims

1. An audio camera with an explosion-proof mechanism, characterized in that, comprising: an audio sensor that senses audio and generates an input audio signal; a barrier circuit unit that receives the input audio signal and generates an output audio signal; and a main control unit that receives and processes the output audio signal and applies the input clock to the barrier circuit unit, wherein the barrier circuit unit generates the output audio signal by restricting the input audio signal within the allowable value of the audio signal, generates the output clock by restricting the input clock within the allowable value of the clock and sends it to the audio sensor.

2. The audio camera with an explosion-proof mechanism according to claim 1, characterized in that: The barrier circuit unit receives an input clock to generate an output clock, and further includes a mechanism for physically separating the input and output.

3. The audio camera with an explosion-proof mechanism according to claim 2, characterized in that: The mechanism is an optocoupler.

4. The audio camera with an explosion-proof mechanism according to claim 1, characterized in that: The barrier circuit unit includes a first barrier PCB area and a second barrier PCB area, The first barrier PCB area includes at least one of a resistor, a fuse or a Zener diode and an optocoupler, The second barrier PCB area includes an optocoupler.

5. The audio camera with an explosion-proof mechanism according to claim 1, characterized in that: The audio sensors are configured to have a separation distance of 1.5 mm or more from each other, or The power supply of the audio sensors is in the range of 1 - 5V.

6. An audio camera with an explosion-proof mechanism, characterized in that, comprising: a front body located at the front end of the audio camera; a sound inlet groove configured to penetrate the front body; a sensor substrate for mounting an audio sensor that senses audio entering through the sound inlet groove; a PCB sound inlet hole formed on the audio sensor at a position corresponding to the sound inlet groove; a housing located behind the front body and forming an internal space; a barrier circuit unit located in the internal space of the housing; a main control unit connected to the barrier circuit unit; and a terminal located behind the housing.

7. The audio camera with an explosion-proof mechanism according to claim 6, characterized in that: The number of the sound inlet grooves is 10 - 300.

8. The audio camera with an explosion-proof mechanism according to claim 6, characterized in that: The PCB sound inlet hole is configured in a groove form that is recessed into the sensor substrate or the audio sensor, or The number of the PCB sound inlet holes is 10 - 300.

9. The audio camera with an explosion-proof mechanism according to claim 6, characterized in that, further comprising: a molded connector that connects the housing and the front body and is coated with epoxy resin, one end of the molded connector is located at the outer part in the radial direction with respect to the center of the housing, the other end of the molded connector is located at the inner part in the radial direction with respect to the center of the housing.

10. The audio camera with an explosion-proof mechanism according to claim 9, characterized in that: The molded connector further includes a needle inserted into the needle insertion portion of the sensor substrate.

11. The audio camera with an explosion-proof mechanism according to claim 6, characterized in that, The housing includes: A front partition portion located behind the sensor substrate forming the built-in space; A rear wall portion located in front of the terminal; and Side wall portions constituting the sides of the housing.

12. The audio camera with an explosion-proof mechanism according to claim 6, characterized in that: The tempered glass shooting hole at the center of the front body is closed, The camera lens portion located behind the tempered glass is connected to the FFC cable, The FFC cable further includes a camera epoxy molding portion located behind the camera lens portion.

13. The audio camera with an explosion-proof mechanism according to claim 12, characterized in that: The FFC cable is connected to the camera body portion located in the built-in space of the housing.

14. The audio camera with an explosion-proof mechanism according to claim 6, characterized in that: The front body and the housing are connected by the front cover fixing bolts of the front cover portion.

15. The audio camera with an explosion-proof mechanism according to claim 6, characterized in that: The terminal includes a cable connector, The cable connector includes a system connector, The system connector connects the cable connected through the system connector to a terminal block located inside the terminal, The terminal block connects the cable to a line bushing located in front of the terminal, The line bushing connects the cable to a splitter connected to the main control portion.

16. The audio camera with an explosion-proof mechanism or a waterproof mechanism according to any one of claims 1-15, characterized in that: The front body further includes a waterproof mechanism portion, and the waterproof mechanism portion includes a sound-permeable waterproof film that horizontally shields the sound inlet groove and is located behind the front body, The waterproof mechanism portion further includes a waterproof mechanism provided between the rear of the front body and the front of the sensor substrate.

17. The audio camera with an explosion-proof mechanism or a waterproof mechanism according to claim 16, characterized in that: The thickness of the sound-permeable waterproof film is 0.005 to 0.02 mm.

18. The audio camera with an explosion-proof mechanism or a waterproof mechanism according to claim 16, characterized in that: The width or diameter of the front side of the sound inlet groove is greater than that of the rear side, and the cross-sectional area gradually widens from the rear side to the front side.

19. The audio camera with an explosion-proof mechanism or a waterproof mechanism according to claim 16, characterized in that, The waterproof mechanism portion includes: A first adhesive layer located in front of the sound-permeable waterproof film; A compressible sponge layer attached to the opposite side of the first adhesive layer and in contact with the sensor substrate to be pressed.

20. The audio camera with an explosion-proof mechanism or a waterproof mechanism according to claim 19, characterized in that, further includes: A counterbore hole, which forms a step at the back of the front body in the sound inlet groove, The first adhesive layer is in surface contact with the bottom surface of the counterbore hole.

21. The audio camera with an explosion-proof mechanism or a waterproof mechanism according to claim 20, characterized in that: The depth of the counterbore hole is 0.2 to 2 mm.

22. The audio camera with an explosion-proof mechanism or a waterproof mechanism according to claim 16, characterized in that, further comprising: An upper protruding cover portion, which is fixed to the upper portion of the front body and protrudes more forward than the front surface of the front body.

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