WO2020183247A1

WO2020183247A1 - Air pumping transducer and sensor coupled thereto

Info

Publication number: WO2020183247A1
Application number: PCT/IB2020/020012
Authority: WO
Inventors: 민병일
Original assignee: 아르크소프트 코포레이션 리미티드
Priority date: 2019-03-13
Filing date: 2020-03-12
Publication date: 2020-09-17
Also published as: KR102430203B1; CN113557751B; CN113557751A; KR20210106944A; KR102294094B1; KR20200109579A

Abstract

An air pumping transducer (100) comprising: a transducer housing (13) having an air passage area on the upper surface thereof; a diaphragm (10) of which both sides are fixed to the inner side walls of the transducer housing (13), and of which a center part moves vertically; a voice coil (11) of which one side is fixed to the diaphragm (10); in order to move the air inside the transducer housing (13) to the outside or to move the air from the outside to the inside of the transducer housing (13), an electrical signal for pumping is used to repeatedly change the shape of the diaphragm (10) between a first changed state (10a) and a second changed state (10b), wherein the first changed state (10a) is when the center part is moving downward, and the second changed state is when the center part is moving upward; and a magnet (12) configured to be separate from the voice coil (11) and used for pushing away or pulling in the voice coil (11) by means of the electrical signal for pumping. The voice coil (11) vibrates by means of an electrical signal for sound waves so that the diaphragm (10) generates a sound wave.

Description

【Explanation of the invention】

【Name of invention】

Air pumping transducer and sensor coupled to the same}

【Technical field】

The present invention relates to an air pumping transducer.

【Technology behind the invention】

Due to industrialization, environmental pollution has become a serious problem. It is known that fine dust or ultrafine dust classified according to the diameter of the particle causes respiratory disease. Meanwhile, harmful gases such as sulfur oxide and nitrogen oxide may cause fatal damage to the human body. These contaminants can be detected by sensors. In recent years, sensors for detecting pollutants have been built into air conditioners such as air conditioners and air cleaners. Sensors for detecting contaminants have been developed in various ways according to sensing methods and precision. The pollutant detection sensor can detect pollutants in the air in a way that allows the air to flow artificially or naturally. Such a method is easy to apply to an air conditioner that occupies a considerable space, but it is difficult to apply to a small electronic device, for example, a smartphone.

【Contents of the invention】

【Problem to be solved】

It is intended to provide a small speaker that operates as an air pump applicable to small electronic devices and a sensor applied thereto. 2020/183247 1»（：1' year 2020/020012

【Means to solve problems】

An embodiment according to an aspect of the present invention provides an air pumping transducer. The air pumping transducer includes a transducer housing having an air permeable region formed on an upper surface thereof, both sides are fixed to an inner wall of the transducer housing, a diaphragm moving up and down at a central portion, and one side is fixed to the diaphragm, and the transducer In order to move the air inside the housing to the outside or to move the air from the outside to the inside of the transducer housing, the diaphragm is repeatedly transformed into a first deformation state and a second deformation state by an electric signal for pumping. Voice coil-Here, the first deformed state is a state in which the central part has moved downward, and the second deformed state is a state in which the central part has moved upward-and is disposed apart from the voice coil, and for pumping It may include a magnet that pushes or pulls the voice coil by an electric signal. Here, the voice coil may vibrate the diaphragm to generate sound waves by an electric signal for sound waves.

In one embodiment, the frequency of the electric signal for pumping may be smaller than the frequency of the electric signal for sound waves, and the amplitude of the electric signal for pumping may be greater than the amplitude of the electric signal for sound waves.

In one embodiment, the voice coil moves the central portion of the diaphragm downward in the first deformed state by the electric signal for pumping, and moves the central portion of the diaphragm upward in the second deformed state. Can be moved. In one embodiment, the air pumping transducer is disposed inside the transducer housing, and a light source for irradiating straight light into the transducer housing, and a light receiving surface are 2020/183247 1» (：1' year 2020/020012 It is placed inside the transducer housing so as to be inclined to the straight light, and it detects the straight light reflected by the particles floating in the air inside the transducer housing and detects the sensing signal. It may further include a photodiode to output.

In one embodiment, the air pumping transducer has a light source that irradiates straight light, a light receiving surface facing a detection area defined in a space through which the straight light passes, and is disposed in front of the detection area in the traveling direction of the straight light. A forward-scattered image sensor and a front-scattered image sensor having a light-receiving surface facing the detection area, and disposed behind the detection area in a traveling direction of the straight light.

In one embodiment, the field of view of the front-scattered image sensor and the field of view of the back-scattered image sensor may be on the same axis.

In one embodiment, the forward-scattered image sensor detects straight light scattered by ultrafine dust to generate a forward-scattered image, and the back-scatter image sensor detects straight light scattered by the fine dust. Scattering images can be generated. Another embodiment according to an aspect of the present invention provides an air pumping transducer. The air pumping transducer includes a transducer housing having an air permeable region formed on an upper surface thereof, and both sides are fixed to an inner wall of the transducer housing, and move the air inside the transducer housing to the outside or transfer air from the outside to the transducer. In order to move inside the housing, a diaphragm that repeatedly transforms into a first and second deformation state in response to an electric signal for pumping I-Here, in the first deformation state, the central part of the diaphragm moves downward. One state, the second 2020/183247 1» (: 1'year 2020/020012 The deformation state is a state in which the central part is moved upwards -, a light source that is disposed inside the transducer housing and irradiates a straight light into the transducer housing, and It may include a photodiode that is disposed inside the transducer housing so that the light-receiving surface is inclined to the straight light, and outputs a sensing signal by detecting the straight light reflected by particles floating in the air inside the transducer housing. Here, the diaphragm may generate sound waves by an electric signal for sound waves.

Another embodiment according to an aspect of the present invention provides an air pumping transducer. The air pumping transducer includes a transducer housing having an air permeable region formed on an upper surface thereof, and both sides are fixed to an inner wall of the transducer housing, and move the air inside the transducer housing to the outside or transfer air from the outside to the transducer. In order to move inside the housing, a diaphragm that repeatedly transforms into a first and second deformation state in response to an electric signal for pumping I-Here, in the first deformation state, the central part of the diaphragm moves downward. One state, and the second deformed state is a state in which the central part is moved upward -, a light source disposed inside the transducer housing and irradiating a straight light into the transducer housing, and in a space through which the straight light passes The detection area has a light-receiving surface facing a defined detection area, a forward-scattered image sensor disposed in front of the detection area in the traveling direction of the straight light, and a light-receiving surface facing the detection area, and the detection area in the traveling direction of the straight light It may include an air pumping transducer further comprising a forward scattering image sensor disposed at the rear of the. Here, the diaphragm may generate sound waves by an electrical signal for sound waves. 2020/183247 1» (：1' year 2020/020012 According to another aspect of the present invention, an embodiment of a fine dust measurement sensor

to provide. The fine dust measurement sensor is in the sensor housing and the sensor housing.

And a light source for irradiating straight light, a light receiving surface disposed inside the sensor housing and facing a detection area defined in a space through which the straight light passes, and disposed in front of the detection area in the traveling direction of the straight light A forward scattering image sensor, and a forward scattering image sensor disposed inside the sensor housing, having a light-receiving surface facing the detection area, and disposed behind the detection area in a traveling direction of the straight light.

In one embodiment, the fine dust measurement sensor may be coupled to the air pumping transducer so as to communicate with air.

In one embodiment, a sensor through hole is formed in a side wall of the fine dust measuring sensor, a transducer through hole is formed in a side wall of the air pumping transducer, and the fine dust measuring sensor and the air pumping transducer include the The sensor through-hole and the transducer through-hole may be coupled to at least partially coincide.

In one embodiment, the fine dust measurement sensor, the air pumping of claim 1

It can be placed on the top of the transducer.

In one embodiment, the forward-scattered image sensor detects straight light scattered by ultrafine dust to generate a forward-scattered image, and the back-scatter image sensor detects straight light scattered by the fine dust. Scattering images can be generated. 2020/183247 1»（：1' year 2020/020012

【Effects of the Invention】

The small speaker operating as an air pump according to an embodiment of the present invention can be applied to a small electronic device that does not have a sufficient space to generate an air flow. Therefore, even a small electronic device may be equipped with a sensor that detects pollutants in the air.

【Simple explanation of drawings】

In the following, the present invention is explained with reference to the embodiments shown in the accompanying drawings. For ease of understanding, throughout the accompanying drawings, like reference numerals are assigned to like elements. The configurations shown in the accompanying drawings are merely exemplary embodiments to describe the present invention, and are not intended to limit the scope of the present invention _. In particular, in the accompanying drawings, some constituent elements are somewhat exaggerated to help understand the invention. Since the drawings are a means for understanding the invention, it should be understood that the width or thickness of the constituent elements represented in the drawings may vary in actual implementation.

1 is a diagram schematically illustrating a driving principle of an air pumping transducer. Figure 2 is a method of driving the air pumping transducer shown in Figure 1

It is an illustrative drawing.

3 is a diagram schematically illustrating a driving circuit of an air pumping transducer. 4 is an application of a fine dust measurement sensor to an air pumping transducer

It is a diagram showing an embodiment.

5 shows a process of driving a fine dust measurement sensor in an air pumping transducer 2020/183247 1» (:1' year 2020/020012 is an exemplary flowchart.

6 is a diagram schematically illustrating a principle of measuring fine dust using an image method. FIG. 7 is a diagram illustrating an embodiment in which the fine dust measurement sensor of FIG. 6 is applied to an air pumping transducer.

8 is a view showing another embodiment in which the fine dust measurement sensor of FIG. 6 is applied to an air pumping transducer.

9 is a view showing another embodiment in which the fine dust measurement sensor of FIG. 6 is applied to an air pumping transducer.

FIG. 1 ◦ is a diagram showing another embodiment in which the fine dust measurement sensor of FIG. 6 is applied to an air pumping transducer.

11 is a view showing another embodiment in which the fine dust measurement sensor of FIG. 6 is applied to an air pumping transducer.

12 is a diagram illustrating an embodiment in which the fine dust measurement sensor of FIG. 6 is applied to an electronic device.

【Specific contents for carrying out the invention】

In the present invention, various modifications may be made and various embodiments may be provided. Specific embodiments are illustrated in the drawings and will be described in detail through detailed description. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In particular, functions, features, and embodiments to be described below with reference to the accompanying drawings, alone or in combination with other embodiments, 2020/183247 1»（：1' year 2020/020012 Can be implemented. Therefore, it should be noted that the scope of the present invention is not limited only to the form shown in the accompanying drawings.

Meanwhile, expressions such as "substantially", "nearly", and "about" among terms used in the present specification are expressions for considering margins or possible errors applied in actual implementation. For example, "9° in practical terms" should be interpreted as including the angle at which the same effect as the effect of 9° can be expected. In other instances, "nearly absent" should be construed as including to the extent that something is negligible, even if it is insignificant.

On the other hand, unless otherwise specified, "side" or "horizontal" is for referring to the left and right directions of the drawing, and "vertical" is for referring to the vertical direction of the drawing. In addition, unless otherwise defined, the angle, the angle of incidence, etc. are based on a virtual straight line perpendicular to the horizontal plane indicated in the drawings.

Throughout the accompanying drawings, the same or similar elements are referred to using the same reference numerals.

1 is a diagram schematically illustrating a driving principle of an air pumping transducer. The air pumping transducer 100 forcibly sucks outside air into the inside, and forcibly discharges the inside air to the outside. The air pumping transducer 100 may suction or discharge air using a diaphragm 10 that operates according to an electrical signal. On the other hand, the diaphragm 10 can convert an electric signal into sound waves. The diaphragm 10 may generate sound waves in an audible band by generating a small wave in air. Air pumping

Transducer 100 is a portable electronic device, for example, a small size mounted on a smartphone It can be implemented using a speaker (Micro speaker).

The air pumping transducer 100 includes a transducer housing 13, a diaphragm 10, a voice coil 11, and a magnet 12. The transducer housing 13 defines an inner space (transducer chamber) of the air pumping transducer 100, and accommodates the diaphragm 10, the voice coil 11, and the magnet 12 therein. An air permeable region in which one or more pores 14 for passing air is formed is formed on the upper surface of the transducer housing 13. The transducer chamber is divided into an upper chamber 15 and a lower chamber 16 by a diaphragm 10, and movement of air between the two chambers may or may not be possible.

Additionally, a liquid barrier for preventing liquid inflow may be disposed above or below the air permeable region.

The diaphragm 10 may be a thin film having at least a part fixed to the inner wall of the transducer housing 13. One side of the voice coil 11 is fixed to the diaphragm 10, and the other side is positioned substantially vertically below the fixed portion. The magnet 12 may be disposed inside the voice coil 11 or between two opposite sides of the voice coil 11 so as not to contact the voice coil 11. For example, the voice coil 11 in the form of a cylinder or a square column is suspended from the lower portion of the diaphragm 10, and the voice coil 11 can move up and down along the side of the magnet 12.

The air pumping transducer 100 may draw outside air into the upper chamber 15 by an applied electrical signal. When the voice coil 11 moves vertically downward due to the interaction between the voice coil 11 and the magnet 12, the diaphragm 10 enters the first deformation state 10a. In the first deformed state (10a), the central portion of the diaphragm 10 is vertically downward 2020/183247 1»（：1' year 2020/020012 It has moved by the distance ratio. The distance ratio is based on the position of the diaphragm 10 in the absence of a signal. When the diaphragm 10 enters the first deformed state 103, the upper chamber 15 expands, thereby generating a negative pressure in the upper chamber 15. The negative pressure may act to move external air to the upper chamber 15.

The air pumping transducer 100 may send air in the upper chamber 15 to the outside by an applied electric signal. When an electric signal of the opposite polarity to the inflow of air is applied to the voice coil 11, the voice coil 11 moves vertically upward by a distance line ₂ so that the diaphragm 10 becomes a second deformed state (1◦的). Distance 山 is when the diaphragm 10 changes from the first deformation state 103 to the second deformation state (1◦的).

This is the distance traveled by the center of the diaphragm 10. When the diaphragm 10 is in the second deformed state (1◦的), the upper chamber 15 is contracted, resulting in a positive pressure in the upper chamber 15. The positive pressure causes the air inside the upper chamber 15 to be transferred to the outside. It can act to move to.

FIG. 2 is a diagram illustrating a method of driving the air pumping transducer shown in FIG. 1 by way of example, and ⑶ of FIG. 2 represents air pumping, and 犯) represents sound wave conversion.

Referring to (3) of FIG. 2, the air pumping transducer 100 performs an air pumping operation according to an electric signal for pumping. In one embodiment, the electrical signal for pumping may be an analog signal, for example, an AC signal. The electrical signal for pumping is applied to the voice coil 11 to move the voice coil 11 in a vertical direction. Due to this, the diaphragm 10 can repeat the first deformation state (10 ₃ ) and the second deformation state (1◦的). 2020/183247 1»（：1' there is 2020/020012. Maximum value of the electrical signal for pumping

Minimum value

The amplitude can be selected within a range in which the diaphragm 10 is not damaged. For example, the first deformed state 103 and the second deformed state (meaning 10, the diaphragm 10 may be in a state in which the diaphragm 10 is maximally deformed. Meanwhile, the frequencies of at least some sections of the electric signal for pumping are substantially deformed) May be the same. For example, the frequency of some sections of the electrical signal for pumping is about

It can be less than 2 hours.

*33 In another embodiment, the electrical signal for pumping is the maximum

Minimum value

\/ _ can be an old file that is repeated In one cycle, the maximum

Minimum value

The proportions can be substantially the same or different. As in the case of the analog type, the frequency of the square wave may be substantially the same in at least some sections. In another embodiment, the electric signal for pumping may be a ramp signal that increases or decreases in a stepwise manner.

2, the air pumping transducer 100 performs air pumping operation by an electric signal for sound waves. The electric signal for sound waves is an analog audio signal, and may be generated by synthesizing AC signals of various frequencies. The frequency of the electric signal for sound waves may be between about 2A^ and about 20,⑶A^, and the amplitude of the electric signal for sound waves may be less than about 50% of the electric signal for pumping. , The voice coil 11 vibrates the diaphragm 10 to generate a sound wave.

3 is a diagram schematically illustrating a driving circuit of an air pumping transducer. The air pumping transducer 100 can operate as a speaker of a portable electronic device. 2020/183247 1»（：1' there is 2020/020012. As an example of a portable electronic device, a smartphone is composed of various parts, but in order to avoid unnecessary explanation, only the configuration related to air pumping and sound wave conversion of the air pumping transducer is illustrated in FIG. 3. Air pumping and sound wave conversion, the processor; 250). Air pumping of the air pumping transducer 100 may be implemented in various ways. The air pumping transducer 100 is driven with an analog signal for the entire duration of the duration, or with a non-analog signal for the entire duration of the duration, or with an analog signal in some sections, and with a non-analog signal for the rest of the duration. Can be. Here, the via analog signal may be a square wave or a ramp signal.

Processor 250 converts the audio data to digital-to-analog converter 240

And the digital-analog converter 240 converts audio data into an analog signal 241. The converted analog signal 241 is input to the amplifier 210 of the driving circuit 200. The amplifier 210 amplifies the analog signal 241 and outputs an electrical signal 211 for pumping. In an embodiment, the audio data may be sampling information of the analog signal 241. Meanwhile, the audio data may include information necessary to generate the analog signal 241, for example, amplitude, frequency, and duration. Here, the duration is a time period in which the pumping electrical signals 211 and 221 are continuously output to the air pumping converter 100.

When the amplification factor of the amplifier 210) is fixed to, the digital-analog converter 240 is

If possible, the analog signal 241 can be generated for a duration. In another embodiment, the audio data includes the frequency of the analog signal 241, and the amplification factor of the amplifier 210 may be variable. The amplification factor is output 2020/183247 1»（：1' year 2020/020012 The maximum value of the electrical signal for pumping (211) is not greater than \ZcOii_max, and the minimum value is

It can be adjusted not to be small. Meanwhile, the air pumping transducer _{100 may} convert an electrical signal for sound waves into sound waves.

The driving circuit 200 may further include a via analog signal generator 220. The analog signal generator 220 may generate an electrical signal for pumping 221 by using the analog signal data provided by the processor 250. The non-analog signal data may include information necessary to generate the electrical signal 221 for pumping, for example, a duty ratio, a frequency, and a duration time. In one embodiment, the pumping electrical signal 221 may be a signal that appears. In another embodiment, pumping electricity

It may be a signal that increases or decreases in a stepwise manner. The electrical signal for pumping 221 in the form of a via analog may be used to cumulatively increase the negative or positive pressure generated in the upper chamber 15. For example, the electrical signal for pumping 221 in the form of a non-analog is the time required for the diaphragm 10 to change from the first deformation state 103 to the second deformation state (1◦的) and the second deformation state. (It is possible to set the time required to change from 1◦的 to the first deformation state (103) differently.

Additionally, the driving circuit 200 may further include a sensor driver 230. The sensor driver 230 drives a sensor mounted inside the air pumping transducer 100 or coupled to the outside of the air pumping transducer 100. The sensor may be, for example, an image sensor. In this case, the sensor driver 230 controls driving of the image sensor and processes the pixel signal output from the image sensor to output an image. When the sensor is a sensor for measuring the concentration of fine dust, the sensor driver 230 2020/183247 1»（：1' year 2020/020012 You can also print out the fine dust concentration by analyzing it. Meanwhile, the image is provided to the processor 250, and the processor 250 may calculate the fine dust concentration using the image. 4 is a view showing an embodiment in which the fine dust measurement sensor is applied to the air pumping transducer, and ⑶ of FIG. 4 is a vertical cross-sectional view of the fine dust measurement sensor 260 coupled to the air pumping transducer 100,犯) is a horizontal cross-sectional view of the fine dust measuring sensor 260 along 1 tooth_.

The fine dust measurement sensor 260 is disposed in the transducer housing 13 of the air pumping transducer 100. In the structure shown in ⑶ of FIG. 4, the fine dust measurement sensor 260 may be disposed in the upper chamber 15. In the structure shown in Figure 4 (的, the light source 261 is disposed on one side wall (1 引 _) in the upper chamber, and the photodiode 264 is a part of the region through which the light-receiving surface 262 passes. The light source 261 and the photodiode 264 may be disposed inside the side walls (1 pin, 13 teeth) to face the inside of the transducer housing 13. 261 irradiates straight light 262 from one side wall (1 引 _ to the other side wall 13 in a continuous or pulsed form). Here, the light source 261 may be a laser diode or an infrared/near infrared ray. When light reflected by fine dust and/or ultrafine dust enters the field of view 265 through which light can enter the photodiode 264, the photodiode 264 outputs a sensing signal. High (fine

It can include dust/ultra-fine dust detection) and logical row (undetected 乂|). An index indicating the concentration of the fine dust/ultra fine dust or the cleanliness of the air (hereinafter, collectively referred to as concentration) may be calculated using the time at which the logical high is maintained.

5 shows a process of driving a fine dust measurement sensor in an air pumping transducer 2020/183247 1» (:1' year 2020/020012 As an exemplary flowchart, this is an exemplary driving method applicable to FIGS. 4 and 7 to 11.

5, in 2◦, the electrical signal for pumping is air pumping

It is applied to the transducer 100. The processor 250 controls the driving circuit 200 according to an air quality measurement command input from the outside, so that the driving circuit 200 generates an electrical signal for pumping and applies it to the air pumping transducer 100. By air pumping, external air can be introduced into the upper chamber 15.

At 21, the fine dust measuring sensor 300 is turned on at the same time as air pumping or after a predetermined time elapses. The light source 310 irradiates the straight light 311, and the front-scattered image sensor 320 and the back-scattered image sensor 330 are in a state in which an image can be acquired according to a capture signal.

At 22, the forward-scattered image sensor 320 and the back-scattered image sensor 330 generate a forward-scattered image and a back-scattered image. The forward-scattered image and the back-scattered image may be obtained substantially simultaneously, and a plurality of the forward-scattered and back-scattered images may be acquired at predetermined time intervals.

At 23, the fine dust and/or ultrafine dust concentration is calculated using the forward scatter image and the back scatter image.

6 is a diagram schematically illustrating a principle of measuring fine dust using an image method. The fine dust measurement sensor 300 uses a light scattering effect that varies depending on the diameter of the particles. Particles floating in the air can be classified into fine dust 20 and ultra fine dust 21 according to their diameter. Fine dust (20) has a diameter of 101^ or less, 2020/183247 1»（：1' year2020/020012 Ultrafine dust (21) has a diameter of 2.5 nis or less. Light traveling straight is scattered differently by the fine dust 20 and the ultrafine dust 21. Assuming that the light travels from left to right, the brightness of fine dust 20 and ultra-fine dust 21 when viewed from the left, i.e. from the rear, and the brightness when viewed from the right, i.e., from the front, are different. . In the case of the fine dust 20, the brightness when viewed from the front is darker than the brightness when viewed from the rear. Conversely, in the case of the ultrafine dust 21, the brightness when viewed from the front is brighter than the brightness when viewed from the rear. Therefore, the fine dust measurement sensor 300 detects a difference in brightness according to the viewing direction as an image.

The fine dust measurement sensor 300 includes a light source 310, a forward scatter image sensor 320, and a back scatter image sensor ₃₃₀ . The light source 310 irradiates the straight light 311 which goes substantially straight. The light source 310 may include, for example, a laser diode. Additionally, the light source 310 may further include a lens that improves the linearity of the straight light 311 by concentrating the light generated by the laser diode.

The forward-scattered image sensor 320 and the back-scattered image sensor 330 are arranged to direct the detection area 312 defined in a space through which the straight light passes. For example, the front-scattered image sensor 320 and the back-scattered image sensor 330 may be disposed symmetrically. The forward scattering image sensor 320 is disposed in front of the detection area 312 (right side in FIG. 6), and detects forward scattering by the fine dust 20 and/or the ultrafine dust 21 within the detection area. . The backscattered image sensor 330 is disposed behind the detection area 312 (left in FIG. 6), and detects backscattering by the fine dust 20 and/or the ultrafine dust 21 within the detection area. . 2020/183247 1»（：1' year 2020/020012 The field of view of the front-scattered image sensor 320 and the back-scattered image sensor 330 千 line; 321 and 331 may overlap in the detection area 312. The fields of view 321 and 331 are determined by an incident angle of light that can be detected by the front-scattered image sensor 320 and the back-scattered image sensor 330. The fields of view 321 and 331 of the front-scattered image sensor 320 and the back-scattered image sensor 330 may be defined by, for example, a hollow guide. The two visual fields 321 and 331 overlap in a region through which the straight light 311 passes, and the overlap region may be the detection region 312. Among the areas through which the straight light 311 passes, the first rear area 3213 of the detection area belongs only to the field of view 321 of the front-scattered image sensor 320, and the second rear area 3313 is a rear-scattered image sensor. It belongs only to the field of view 331 of 330. Accordingly, the forward-scattered image sensor 320 cannot acquire an image of the fine dust 20 and/or the ultra-fine dust 21 of the second rear area 3313, and similarly, the back-scattered image sensor 330 is 1 An image of the rear area 3213 cannot be acquired. As the angle 0 between the fields of view 321 and 331 increases, the volume of the detection area 312 increases, and forward scattering and back scattering can be more clearly distinguished.

The forward-scattered image sensor 320 and the back-scattered image sensor 330 may be monochromatic image sensors. For example, the front-scattered image sensor 320 and the back-scattered image sensor 330 may output gray scale images 322 and 332.

The fine dust 20 and/or the ultra-fine dust 21 may include a first forward scatter image 322 generated by the forward scatter image sensor 320 and a first rear scatter image 322 generated by the back scatter image sensor 330. It can be identified using the scattering image 332. The first forward scattering image 322 includes fine dust 20 existing in the detection area 312 and the first rear area 3213, and 2020/183247 1»（：1' year 2020/020012 Represents ultrafine dust 21, and the first backscattered image 332 shows fine particles present in the detection area 312 and the second rear area 3313). Dust (20) and ultra-fine dust (21) can be expressed. In an embodiment, the first forward scattered image 322 may be used to detect the ultrafine dust 21, and the first backscattered image 332 may be used to detect the fine dust 20. The first forward scattering image 322 represents the fine dust 20 and/or the ultrafine dust 21 present in the detection region 312 and the first rear region 3213, and the first backscatter image 332 ) Represents the fine dust 20 and/or the ultrafine dust 21 present in the detection region 312 and the second rear region 331 li. A region expressed relatively brightly in the first forward scattering image 322 When the area of is calculated, the concentration of the ultrafine dust 21 is obtained, and by calculating the area of the area that is relatively brightly expressed in the first backscatter image 332, the concentration of the fine dust 20 can be obtained.

In another embodiment, the concentration of the fine dust 20 and/or the ultrafine dust 21 may be calculated in consideration of the correlation between the first forward-scattered image 322 and the first back-scattered image 332. The concentration of the fine dust 20 is calculated by detecting a darkly expressed area in the first forward scattering image 322 and a brightly expressed area in the first backscattering image 332, and in the first forward scattering image 322 The concentration of the ultrafine dust 21 may be calculated by detecting a brightly expressed area and a darkly expressed area in the first backscattered image 332. The volumes of the detection area 312 and the rear areas 3213 and 3313 are the cross-sectional area of the straight light 311, the field of view 321,

331) can be calculated using the cross-sectional area and angle 0.

In another embodiment, the concentration of the fine dust 20 and/or the ultrafine dust 21 may be calculated in consideration of the correlation between the first forward-scattered image 322 and the first back-scattered image 332. 2020/183247 1»（：1' there is 2020/020012. Since the fine dust 20 and the ultra-fine dust 21 exist in the detection area 312 and the rear areas 3313 and 3313 which are three-dimensional spaces, the first front scattering image 322 and the first back scattering image 332 ) May be different from each other. Since a technique for identifying an object disposed in a three-dimensional space is widely known, the first forward-scattered image 322 and the first back-scattered image 332 are compared, and the fine dust 20 that exists only in the detection area 312 is And the ultrafine dust 21, or it is possible to identify both the fine dust 20 and the ultrafine dust 21 present in the detection area 312 and the rear area (32¼ 331 li). Forward scattering image sensor 320, the back-scattered image sensor 330 and the straight light 311 are located in substantially the same plane, and the light-receiving surfaces of the forward-scattered image sensor 320 and the back-scattered image sensor 330 are substantially perpendicular to the plane. For example, the identification of the same fine dust 20 and/or ultrafine dust 21 in the first forward scatter image 322 and the first back scatter image 332 It can be achieved by comparing the distance from the top to the fine dust 20 and/or the ultrafine dust 21. The second front-scattered image 323 and the second back-scattered image 333 are the detection area 312 It is possible to represent the fine dust 20 and/or the ultrafine dust 21 present in the.

FIG. 7 is a diagram illustrating an embodiment in which the fine dust measurement sensor of FIG. 6 is applied to an air pumping transducer.

Referring to FIG. 7, the fine dust measurement sensor 300 and the air pumping transducer 100 may be integrally implemented. ⑶ of FIG. 7 is a vertical cross-sectional view of the fine dust measurement sensor 300 implemented in the air pumping transducer 100, and (犯) and ((:) are horizontal of the fine dust measurement sensor 300 according to 11-11_ It is a cross-sectional view. 2020/183247 1» (：1' year 2020/020012 Fine dust measurement sensor 300 is placed in the transducer housing 13 of the air pumping transducer 100. In the structure shown in ⑶ of FIG. 7, the fine dust measurement sensor 300 is shown to be disposed above the diaphragm 10, but the shape of the voice coil 11 is a straight light 311 and a field of view 321, If it does not interfere with 331, it may be disposed under the diaphragm 10. In the structure shown in FIG. 7 (的, the light source 310 and the backscattered image sensor 330 are disposed on one side wall 131_ in the upper chamber 15, and the forward scattered image

The sensor 320 is illustrated as being disposed on the other side wall 13¾ opposite to one side wall 131_. However, the front-scattered image sensor 320 and the back-scattered image sensor 330 are the same sidewalls, for example, It may be disposed on the horizontal wall (13 teeth). The light source 310, the front-scattered image sensor 320, and the back-scattered image sensor 330 are side walls (1 pin _, 13. The light source 310 irradiates straight light 311 from one side wall to the other side wall. The front-scattered image sensor 320 and the back-scattered image sensor 330 may include straight light 311 ) Is disposed to be inclined toward the detection region 312, which is a part of the passing region. Accordingly, the field of view 321 of the front-scattered image sensor 320 and the field of view of the back-scattered image sensor 330 are the detection region 312 Cross at

On the other hand, ((:) of FIG. 7 shows a structure in which the field of view 321 of the front-scattered image sensor 320 and the field of view 331 of the back-scattered image sensor 330 are disposed on substantially the same axis. The scattering image sensor 320 and the back scattering image sensor 330 are disposed on the other side wall 13 and one side wall (1 引 _), and face each other so that the fields of view 321 and 331 are inclined to the straight light 311 Compared with .犯), since the background area visible only to one image sensor does not exist substantially, the microscopic image using the forward-scattered image and the back-scattered image 2020/183247 1»（：1' year 2020/020012 The amount of computation required to measure the dust/ultra-fine dust concentration can be significantly reduced.

Referring to FIG. 8, the fine dust measuring sensor 301 and the air pumping transducer 101 may be independently manufactured and then combined. ⑶ of Figure 8 is a combined air pumping

It is a vertical cross-sectional view of the transducer 101 and the fine dust measuring sensor 301, (((((((((()))))))))))))))))))))))))))))))))))))))))); :) is a perspective view showing an exemplary coupling structure between the air pumping transducer 101 and the fine dust measurement sensor 301.

Fine dust measurement sensor 301 pumps air to enable air communication

It is coupled to the transducer 101. The fine dust measurement sensor 301 includes a sensor housing 301 (:), a light source 310 disposed in an inner space (sensor chamber) of the sensor housing 301, a front scattering image sensor 320, and a back scattering image sensor 330. The transducer through-hole 133 is formed on one side wall (1 引 _) of the air pumping transducer 101, and the sensor through hole 3013 is the other side wall ( It is formed in 301. The other side wall 301 of the sensor housing 301 (:) is one side wall of the air pumping transducer 101 so that the sensor through hole 3013 and the transducer through hole 133 at least partially coincide. The air can move between the transducer chamber and the sensor chamber through the air passage through the sensor through-hole 3013 and the transducer through-hole 133 that are at least partially matched. The light source 310 is disposed on one side wall 3011_ and irradiates straight light toward the other side wall 301. In the illustrated structure, the front scattered image sensor 320 is disposed on the other side wall 301, and the back scattered image sensor ( 330) is 2020/183247 1» (：1' year 2020/020012 Arranged on one side wall (3011_). Although not shown, the front-scattered image sensor 320 and the back-scattered image sensor 330 may be disposed on, for example, a horizontal wall 301. In one embodiment, the fine dust measurement sensor 301 is an ultrafine particle sensor. Dust is measured, and the air pumping transducer 101 can measure fine dust and ultrafine dust. In Fig. 4, the fine dust measurement sensor 260 is in the upper chamber 15 of the air pumping transducer 101. It is disposed, and a filter (not shown) that blocks movement of fine dust toward the sensor chamber may be disposed in the air passage.

Referring to FIG. ₉ , the fine dust measuring sensor 302 and the air pumping transducer 102 may be independently manufactured and then combined. 9 (3) and (的) are vertical cross-sectional views of the combined air pumping transducer 102 and the fine dust measuring sensor 302, ((:) is the air pumping transducer 102 and the fine dust measuring sensor ( 302) is a perspective view showing an exemplary coupling structure.

The fine dust measurement sensor 302 pumps air to enable air communication

It is coupled to the upper chamber 15 and the lower chamber 16 of the transducer 102. The fine dust measurement sensor 302 includes a sensor housing 302 (:) defining a sensor chamber, a light source 310 disposed in the sensor chamber, a front scattering image sensor 320 and a back scattering image sensor 330. The first transducer through-hole 133 and the second transducer through-hole (1¾) are formed in one side wall (131_) of the air pumping transducer 102, and the first sensor through-hole 3023 and the second sensor The through hole 302 is formed in the other side wall 301 of the sensor housing 3010. Here, the first 2020/183247 1»（：1' year 2020/020012 Transducer through hole 133 is formed in the upper chamber 15 side, and the second transducer

The through hole 13 is formed on the side of the lower chamber 16. The other side wall (302¾) of the sensor housing 3020 is at least partially coincident with the first sensor through hole 3023 and the first transducer through hole 133 And, the second sensor through-hole (302) and the second transducer through-hole (13) are coupled to one side wall (131_) of the air pumping transducer 101 to at least partially coincide with each other. The air is through the first sensor through-hole (13). Through the first air passage through the 3023 and the first transducer through hole 133, it is possible to move between the upper chamber 15 and the sensor chamber, and the second sensor through hole 302 and the second transducer through hole (It is possible to move between the lower chamber 16 and the sensor chamber through the second air passage by 13 tails. When the diaphragm 10 is deformed upward, some of the air in the upper chamber 15 is converted to an air pumping transducer ( 102) is discharged to the outside, the remaining part moves to the sensor chamber, and some of the air in the sensor chamber moves to the lower chamber 16. Conversely, when the diaphragm 10 is deformed downward, the lower chamber 16 ) Of the air moves to the sensor chamber, the air from the sensor chamber moves to the upper chamber 15, and air is introduced into the upper chamber 15 from the outside.

The front-scattered image sensor 320 and the back-scattered image sensor 330 may be disposed so that the light-receiving surfaces do not face each other, or the light-receiving surfaces may be disposed to face each other. In ⑶ of FIG. 9, the front scattering image sensor 320 is disposed inclined near the lower end of one side wall 302!_, and the back scattering image sensor 330 is disposed inclined near the lower end of the other side wall 302. This In the arrangement, the light-receiving surfaces of the forward-scattered image sensor 320 and the back-scattered image sensor 330 are inclined to direct the detection area through which the straight light irradiated by the light source 310 passes. The detection area is the forward-scattered image sensor. 320 and backscatter 2020/183247 1» (:1' year 2020/020012 Since it is between the image sensor 330, the light-receiving surfaces of the front-scattered image sensor 320 and the back-scattered image sensor 330 do not face each other. Meanwhile, in FIG. 9, the front scattering image sensor 320 is disposed to be inclined near the lower end of one side wall 3021_, and the back scattered image sensor 330 is disposed to be inclined near the upper end of the other side wall 302 ¾. In this arrangement, the light-receiving surfaces of the front-scattered image sensor 320 and the back-scattered image sensor 330 are inclined to direct the detection area through which the straight light irradiated by the light source 310 passes. The detection area is the forward-scattered image. Since it is between the sensor 320 and the back-scattered image sensor 330, the light-receiving surfaces of the front-scattered image sensor 320 and the back-scattered image sensor 330 face each other.

Referring to Fig. 1◦, the fine dust measurement sensor 303 and air pumping

The transducer 103 may be independently manufactured and then combined. (3) of FIG. 1 is a vertical cross-sectional view of the combined air pumping transducer 103 and the fine dust measurement sensor 303, 犯)

It is a horizontal cross-sectional view of the fine dust measuring sensor 303, ((:) is a perspective view showing an exemplary coupling structure between the air pumping transducer 103 and the fine dust measuring sensor 303.

The fine dust measurement sensor 303 pumps air to enable air communication

It is coupled to the upper chamber 15 of the transducer 103. The fine dust measurement sensor 303 includes a first sensor housing 303-1, a second sensor housing 303-2, a light source 310 disposed in the first sensor housing 303-1, and a back scattering image sensor. 330, and forward scattering disposed in the second sensor housing 303-2 2020/183247 1»（：1' year 2020/020012 Including image sensor 320. The first transducer through-hole 133 and the second transducer through-hole (13 ratio is formed in one side wall 131_ of the air pumping transducer 103), and the third transducer through hole (13 is air pumping transducer ( 103. The first to third transducer through holes 133 and 13 are formed in the upper chamber 15. The first sensor hole 3033 and the second sensor hole The 303 ratio is formed in the first sensor housing 303-1, and the third sensor hole 303 is formed in the second sensor housing 303-2. The first housing 303-1 is formed in the first sensor hole ( 3033) and the first transducer through-hole 133 at least partially coincide, and the second sensor hole 303 and the second transducer through-hole 13 at least partially coincide, the work of the air pumping transducer 101 It is coupled to the side wall (1 引 _). The second housing 303-2 is formed of the air pumping transducer 101 so that the third sensor hole 303 and the third transducer through hole 13 are at least partially aligned. It is connected to the other side wall (13¾. 2nd transducer)

The through hole 13 and the second sensor hole 303 are formed to be inclined with respect to one side wall 131_, and the third transducer through hole 13 and the third sensor hole 303 may be formed to be inclined with respect to the other side wall 13. The light source 310 is disposed in the first sensor hole 3033, the front scattered image sensor 320 is disposed in the third sensor hole 303, and the back scattered image sensor 330 is disposed in the second sensor hole 303 Can be placed in the rain.

Referring to FIG. 11, the fine dust measurement sensor 304 and the air pumping transducer 104 may be independently manufactured and then combined. ⑶ of Figure 11 is a combined air pumping

It is a vertical cross-sectional view of the transducer 104 and the fine dust measurement sensor 304,

2020/183247 1» (：1' is a horizontal cross-sectional view of the fine dust measurement sensor 304 according to 2020/020012, ((：) is air pumping

It is a perspective view showing an exemplary coupling structure between the transducer 104 and the fine dust measurement sensor 304.

The fine dust measurement sensor 304 is coupled to the upper surface of the air pumping transducer 104. The fine dust measurement sensor 304 includes a sensor housing 3040, a light source 310 disposed in the sensor housing 3040, a front scattering image sensor 320, and a back scattering image sensor 330. The sensor housing 3040 , Exposing the air permeable region formed on the upper surface (1 計) of the air pumping transducer 104, and coupled to the periphery of the air permeable region. The first sensor hole 3043 and the second sensor hole 304 are a sensor housing. (It is formed on one side wall (304!_) of the 3040, and the third sensor hole (304(:) is formed on the other side wall (304¾) of the sensor housing 3040. The second sensor hole 304 is, one side wall (131_) ), and the third sensor hole 304 (:) may be formed to be inclined with respect to the other side wall 13. The light source 310 is disposed in the first sensor hole 3043, and the forward scattering image sensor ( 320 may be disposed in the third sensor hole 304 (:), and the backscattered image sensor 330 may be disposed within the second sensor hole 304.

The fine dust measurement sensor 304 shown in FIG. 11 is disposed outside the air pumping transducer 104 and measures fine dust and/or ultrafine dust from the air introduced or discharged into the upper chamber 15. . To this end, the fine dust measurement sensor 304 may be disposed between the air pumping transducer 104 and the electronic device housing.

Referring to FIG. ₁₂ , the fine dust measurement sensor 400 is applied to the portable electronic device 500. 2020/183247 1»（：1' year 2020/020012 will be built. The portable electronic device 500 is composed of a housing 520 containing electronic and mechanical components and a protective glass 510 coupled to the top of the housing 520.

The fine dust measuring device 400 is disposed inside the housing 520 and may be isolated from the outside by a protective glass 510.

The fine dust measurement sensor 400 includes a housing 410, a light source 310 disposed inside the housing 410, a front scattering image sensor 320, and a back scattering image sensor 330. At least a portion of the upper portion of the housing 410 is open. On the upper portion of the housing 410, a cover 420 having at least a portion of which is optically transparent may be disposed. Here, the cover 420 may be provided as a part of the housing 410 or may be a protective glass 510 of the portable electronic device 500. In the following, the housing 410 | Some cases are mainly explained. In the cover 420, a first transmission region 421 through which the straight light 311 passes, a second transmission region 422 corresponding to the field of view 321 of the forward scatter image sensor 320, and a back scatter image sensor A third transmission region 423 corresponding to the field of view 331 of 330 is formed. The first to third transmission regions 421 to 423 are optically transparent to allow the straight light 311 to pass (first transmission region) or the light emitted from the detection region 312 (second and Third transmissive area).

The detection area 312 is located outside the portable electronic device 500. The light source 310 is disposed toward the first transmission region 421. The straight light 311 passes through the first transmission region 421

Go through and go outside. The forward-scattered image sensor 320 and the back-scattered image sensor 330 receive light that passes through the second transmission region 422 and the third transmission region 423, respectively, to receive the forward-scattered image and the back-scattered image. Generate. 2020/183247 1»（：1' year 2020/020012 The light source 310 can minimize the effect of ambient light by irradiating laser or infrared rays at a certain period or at a specific wavelength. The front-scattered image sensor 320 and the back-scattered image sensor 330 operate when the light source 310 is driven to generate a front-scattered image and a back-scattered image. Additionally, in order to reduce the influence of ambient light, the second transmission region 422 and the third transmission region 423 may be filters that transmit only light having substantially the same wavelength as the straight light 311.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. In particular, the features of the present invention described with reference to the drawings are not limited to the structures shown in the specific drawings, and may be implemented independently or in combination with other features.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

Claims

2020/183247 1»（：1' year 2020/020012 【Claim Woo I】

【Claim 1】

A transducer housing having an air permeable region formed on an upper surface thereof;

A diaphragm having both sides fixed to the inner wall of the transducer housing and moving up and down at a central portion;

One side is fixed to the diaphragm, and in order to move the air inside the transducer housing to the outside or to move the air from the outside to the inside of the transducer housing, the diaphragm is first moved by an electric signal for pumping. A voice coil that repeatedly deforms into a deformed state and a second deformed state, wherein the first deformed state is a state in which the central portion is moved downward, and the second deformed state is a state in which the central portion is moved upward; And

It is disposed to be spaced apart from the voice coil, comprising a magnet that pushes or pulls the voice coil by the electric signal for pumping,

The voice coil is an air pumping transducer that vibrates so that the diaphragm generates sound waves by an electrical signal for sound waves.

【Claim 2】

The air pumping transducer of claim 1, wherein a frequency of the electric signal for pumping is less than a frequency of the electric signal for sound waves, and an amplitude of the electric signal for pumping is greater than an amplitude of the electric signal for sound waves.

【Claim 3】

The method of claim 2, wherein the voice coil, by the electric signal for pumping 2020/183247 1»（：1' year 2020/020012 Air pumping that moves the central part of the diaphragm downward in the first deformed state, and moves the central part of the diaphragm upward in the second deformed state. Transducer.

【Claim 4】

The method according to claim 1,

A light source disposed inside the transducer housing and irradiating straight light into the transducer housing; And

Air pumping further comprising a photodiode that is disposed inside the transducer housing so that the light-receiving surface is inclined to the straight light, and outputs a sensing signal by detecting the straight light reflected by the particles floating in the air inside the transducer housing Transducer.

【Claim 5】

The method according to claim 1,

A light source that irradiates straight light;

A forward scattering image sensor having a light-receiving surface facing a detection area defined in a space through which the straight light passes, and disposed in front of the detection area in a traveling direction of the straight light; And a forward scattering image sensor having a light-receiving surface facing the detection area and disposed behind the detection area in a traveling direction of the straight light.

【Claim 6】 2020/183247 1»（：1' year 2020/020012 In claim 5,

An air pumping transducer in which the field of view of the forward scattering image sensor and the field of view of the back scattering image sensor are on the same axis.

【Claim 7】

The method according to claim 5, wherein the forward-scattered image sensor generates a forward-scattered image by detecting straight light scattered by ultrafine dust,

The back-scattered image sensor is an air pumping transducer configured to generate a back-scattered image by detecting straight light scattered by fine dust.

【Claim 8】

Sensor housing;

A light source disposed inside the sensor housing and irradiating straight light;

A forward scattering image sensor disposed inside the sensor housing, having a light-receiving surface facing a detection area defined in a space through which the straight light passes, and disposed in front of the detection area in a traveling direction of the straight light; And a front scattering image sensor disposed inside the sensor housing, having a light-receiving surface facing the detection area, and disposed behind the detection area in a traveling direction of the straight light.

【Claim 9】

The fine dust measuring sensor of claim 8, wherein the fine dust measuring sensor is coupled to the air pumping transducer of claim 1 to enable air communication.

【Claim 10】 2020/183247 1» (:1' year 2020/020012) The method according to claim 9, wherein a sensor through hole is formed in a side wall of the fine dust measurement sensor, a transducer through hole is formed in a side wall of the air pumping transducer, and the The fine dust measuring sensor and the air pumping transducer are coupled to at least partially coincide with the sensor through-hole and the transducer through-hole.

【Claim 11】

The method of claim 8, wherein the fine dust measurement sensor, the fine dust measurement sensor disposed on the upper surface of the air pumping transducer of claim 1.

【Claim 12】

The fine dust measurement sensor of claim 8, wherein a field of view of the front-scattered image sensor and a field of view of the back-scattered image sensor are on the same axis.

【Claim 13】

The method of claim 8, wherein the forward-scattered image sensor generates a forward-scattered image by detecting straight light scattered by ultrafine dust,

The back-scattered image sensor is a fine dust measurement sensor for generating a back-scattered image by detecting straight light scattered by fine dust.

【Claim 14】

Both sides are fixed to the inner wall of the transducer housing, and in order to move the air inside the transducer housing to the outside or to move the air from the outside to the inside of the transducer housing, it is controlled by an electric signal for pumping. One 2020/183247 1» (: 1'year 2020/020012 A diaphragm that repeatedly deforms into a deformed state and a second deformed state-Here, the first deformed state is a state in which the central part of the diaphragm has moved downward, and the The second deformed state is a state in which the central portion has moved upward -;

A photodiode that is disposed inside the transducer housing so that the light-receiving surface is inclined to the straight light, and detects the straight light reflected by the particles floating in the air inside the transducer housing and outputs a sensing signal,

The diaphragm is an air pumping transducer that generates sound waves based on an electrical signal for sound waves.

【Claim 15】

Both sides are fixed to the inner wall of the transducer housing, and in order to move the air inside the transducer housing to the outside or to move the air from the outside to the inside of the transducer housing, it is controlled by an electric signal for pumping. A diaphragm that repeatedly deforms into a 1 deformed state and a second deformed state-Here, the first deformed state is a state in which the central part of the diaphragm has moved downward, and the second deformed state is a state in which the central part is moved upward. State -;

A light source disposed inside the transducer housing and irradiating straight light into the transducer housing;

The light-receiving surface facing the detection area defined in the space through which the straight light passes 2020/183247 1» (: 1'year 2020/020012, a forward scattering image sensor disposed in front of the detection area in the traveling direction of the straight light; And an air pumping transducer having a light-receiving surface facing the detection area, and further comprising a forward scattering image sensor disposed behind the detection area in a traveling direction of the straight light,