Particle detection module

Abstract

SOLUTION: This particle detection module comprises a detection accuracy improvement structure. The detection accuracy improvement structure includes a scattering prevention structure and a stray light suppression structure. The scattering prevention structure is installed in a region where a suction groove of a base seat corresponds to a laser component. The stray light suppression structure is installed in each of the position of the suction groove corresponding to a projection region of the laser component and first and second light trap structures having geometric shapes in the light trap region.EFFECT: Thus, direct projection of excessive stray light on the position of a particle sensor is prevented, and detection accuracy is improved.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a particle detection module, and more particularly to an ultra-thin particle detection module.

Background Art

[0002] Floating particles refer to solid particles or droplets contained in gas. Since their particle size is very small, they can easily penetrate into the human lungs through the nasal hairs in the nasal cavity, causing lung inflammation, asthma, cardiovascular diseases, etc. When other pollutants adhere to the floating particles, the harm to the respiratory system becomes even greater. In recent years, the problem of air pollution has become increasingly serious. In particular, the concentration data of fine floating particles (e.g., PM2.5) are often too high, and the concentration monitoring of floating particles in gas has attracted attention. However, the gas flow is unstable due to wind direction and wind volume, and most of the current gas monitoring stations for detecting floating particles are fixed-point type, so the surrounding floating particle concentration cannot be immediately confirmed. Therefore, there is a need for a small and portable gas detection module that allows users to detect the concentration of surrounding floating particles at any time and anywhere.

[0003] Also, as shown in Taiwan Patent Application No. 107130404, the housing of the particle detection device of the current particle detection module is restricted by the size of the air guiding component and the internal gas flow path, and it is difficult to reduce its volume. For example, the gas in the air guiding path enters from the upper layer inlet, then is introduced into the lower layer, detected, guided by a micropump, and finally returns to the upper layer outlet and is discharged. The structure of the air guiding passage designed in this way has a multi-layer path, is complex and has a relatively high height, so it is difficult to reduce the thickness of the entire particle detection module or to mount it on small mobile devices or other portable electronic devices. Therefore, how to reduce the weight and thickness of the particle detection device has become an urgent problem to be solved.

[0004] However, when the particle detection device is reduced in weight and thickness, the detection accuracy of the laser light for particle detection is also affected by the decrease in volume. Therefore, how to reduce the weight and thickness of the particle detection device while maintaining the detection accuracy of the laser light for particle detection has become the main issue in the research of the present invention.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The main object of the present invention is to mainly install a scattering prevention structure in the area where the intake groove of the base corresponds to the laser component, and further, the position of the intake groove corresponding to the projection area of the laser component and the first optical trap structure and the second optical trap structure having a geometric shape within the optical trap area are respectively provided with a stray light suppression structure, so that the particle sensor can more easily receive and calculate the projection spot by the light-scattering particles of the laser, obtain the relevant information on the particle size and concentration of the suspended particles contained in the gas, improve the detection accuracy without distortion, and improve the detection efficiency of the particle sensor. The present invention provides a particle detection module.

Means for Solving the Problems

[0006] An embodiment of the present invention in a broad sense is a particle detection module including a base, a piezoelectric actuator, a drive circuit board, a laser component, a particle sensor, a detection accuracy improvement structure, and an outer cover. The base has an intake groove defining an intake path and an exhaust groove defining an exhaust path. An optical trapping region is provided in a direction corresponding to the projection beam of the laser component. Light transmission windows for the projection beam of the laser component to pass through into the optical trapping region penetrate through both side walls of the intake groove in a direction perpendicular to the projection beam of the laser component. In the detection accuracy improvement structure, mainly, a scattering prevention structure is provided in a region of the intake groove of the base corresponding to the laser component, and a stray light suppression structure is provided for each of the position of the intake groove corresponding to the projection region of the laser component and a first optical trapping structure and a second optical trapping structure having a geometric shape in the optical trapping region, so as to prevent excessive stray light from being directly reflected to the position of the particle sensor after the projection beam emitted from the laser component enters the position of the intake groove and the optical trapping region, thereby preventing distortion in detection accuracy.

Brief Description of the Drawings

[0007]

Fig. 1A

Fig. 1B

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9A

Fig. 9B

Fig. 9C

Embodiments for Carrying Out the Invention

[0008] Embodiments showing the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different aspects, all without departing from the scope of the present invention, and the description and drawings are essentially used for illustration purposes and are not intended to limit the present invention.

[0009] Referring to FIGS. 1A, 1B, 2, and 3, the particle detection module of the present invention includes a base 1, a piezoelectric actuator 2, a drive circuit board 3, a laser component 4, a particle sensor 5, and an outer cover 6. The drive circuit board 3 is in cover contact with the first surface 11 of the base 1, and the laser component 4 is installed on and electrically connected to the drive circuit board 3. The particle sensor 5 is also installed on and electrically connected to the drive circuit board 3. The outer cover 6 covers the base 1 and is in cover contact with the second surface 12 of the base 1. Further, the outer cover 6 has a side plate 61 having an intake frame opening 61a and an exhaust frame opening 61b.

[0010] Referring to FIGS. 2, 3, 4, and 5, the base 1 includes a laser installation area 13, an intake groove 14, a component mounting area 15 for air guiding components, and an exhaust groove 16. To clearly illustrate the positions of the laser component 4 and the particle sensor 5 with respect to the base 1, the drive circuit board 3 is intentionally omitted in FIG. 3. Also, an intake port 14a that communicates with the outside of the base 1 and corresponds to the intake frame opening 61a of the outer cover 6 is provided in the intake groove 14. Both side walls of the intake groove 14 are penetrated by light transmission windows 14b respectively, and the light transmission windows 14b communicate with the laser installation area 13. A ventilation hole 15a penetrates the bottom surface of the component mounting area 15 for air guiding components. The ventilation hole 15a communicates with the intake groove 14 and also communicates with the exhaust port 16a of the exhaust groove 16. The exhaust port 16a is installed corresponding to the exhaust frame opening 61b of the outer cover 6. Therefore, by covering and closely adhering the first surface 11 of the base 1 with the drive circuit board 3 and the second surface 12 with the outer cover 6, an intake path is defined by the intake groove 14, and an exhaust path is defined by the exhaust groove 16.

[0011] Referring to FIGS. 2, 3 to 5, the laser component 4 is housed within the laser installation area 13 of the base 1, and the particle sensor 5 is housed within the intake groove 14 of the base 1 and is aligned with the laser component 4. Also, by the laser component 4 corresponding to the light transmission window 14b through which the laser light emitted from the laser component 4 passes, the laser light is irradiated into the intake groove 14. The beam path H emitted by the laser component 4 passes through the light transmission window 14b and forms a direction orthogonal to the intake groove 14. The projection beam emitted from the laser component 4 enters the intake groove 14 through the light transmission window 14b and irradiates the floating particles contained in the gas within the intake groove 14. When the beam contacts the floating particles, it scatters to generate a projection spot. The particle sensor 5 receives and calculates the projection spot caused by the scattering to obtain relevant information on the particle size and concentration of the floating particles contained in the gas. The particle sensor 5 is a PM2.5 sensor.

[0012] Referring to FIGS. 9A to 9C, all the gas enters from the intake frame opening 61a of the outer lid 6, passes through the intake port 14a and enters the intake groove 14 of the base 1, and flows to the position of the particle sensor 5. Also, by absorbing the gas in the intake path by the continuous driving of the piezoelectric actuator 2, the external gas is quickly introduced and stably circulated, passes above the particle sensor 5. At this time, the projection beam emitted from the laser component 4 enters the intake groove 14 through the light transmission window 14b and irradiates the floating particles contained in the gas passing above the particle sensor 5 from the intake groove 14. When the beam contacts the floating particles, it scatters to generate a projection spot. The particle sensor 5 receives the projection spot due to scattering and executes calculations to obtain relevant information on the particle size and concentration of the floating particles contained in the gas. The gas above the particle sensor 5 is also introduced into the vent hole 15a of the air guide component mounting area 15 by the continuous driving of the piezoelectric actuator 2, and then enters the exhaust groove 16 (as shown in FIG. 9B). After the gas enters the exhaust groove 16, the piezoelectric actuator 2 continues to discharge the gas to the outside through the exhaust port 16a and the exhaust frame opening 61b.

[0013] Of course, as shown in FIG. 8, the base 1 further includes an optical trapping region 17 corresponding to the laser installation region 13. The optical trapping region 17 can project the beam emitted from the laser component 4 therethrough by passing through the light transmission window 14b. The optical trapping region 17 is provided with a first optical trapping structure 17a and a second optical trapping structure 17b having geometric shapes, and a side housing 17c. The first optical trapping structure 17a corresponds to the beam path H emitted from the laser component 4. The first optical trapping structure 17a and the second optical trapping structure 17b can be designed to have geometric shapes such as a wave surface, an oblique conical surface, a parabolic surface, etc., according to the requirements of the emitted beam path H. The included angle between the first optical trapping structure 17a and the second optical trapping structure 17b at one end connected to the side housing 17c is an obtuse angle, and the included angle between the first optical trapping structure 17a and the second optical trapping structure 17b at one end adjacent to both side walls is an acute angle. Thereby, the emitted beam is reflected within the range where the first optical trapping structure 17a, the second optical trapping structure 17b, and the plurality of side housings 17c of the optical trapping region 17 are arranged in a trapezoidal shape. In the embodiment of the present invention, the first optical trapping structure 17a is designed to have an oblique conical surface, and the second optical trapping structure 17b is designed to have a wave surface, but the present invention is not limited thereto.

[0014] As can be seen from the above description, in the particle detection module of the present invention, through the structural design of appropriately arranging the laser installation area 13, the intake groove 14, the air guiding component mounting area 15, and the exhaust groove 16 on the base 1, and the close contact design of the outer cover 6 and the drive circuit board 3, the first surface 11 of the base 1 is covered by the drive circuit board 3, and the second surface 12 is covered by the outer cover 6. Thus, the intake path is defined by the intake groove 14, and the exhaust path is defined by the exhaust groove 16, forming a single-layer air guiding passage path. Thereby, the height of the overall structure of the particle detection module of the present invention is reduced, making it suitable for assembly with small portable electronic devices or small mobile devices, and allowing users to detect the ambient particle concentration while carrying it. Also, when the particle detection module is made lighter and thinner, the detection accuracy of the laser light for particle detection is also affected by the volume reduction. In the present invention, after the particle detection module is made lighter and thinner, an improved particle detection module is provided to avoid distortion of the detection accuracy of the laser light. The base 1 of the particle detection module of the present invention has an intake groove 14 that defines an intake path and an exhaust groove 16 that defines an exhaust path. A light trap region 17 is provided in the direction corresponding to the projection beam of the laser component 4. On both side walls of the intake groove 14 in the direction perpendicular to the projection beam of the laser component 4, light transmission windows 14b for the projection beam of the laser component 4 to pass through into the light trap region 17 penetrate respectively. The particle detection module of the present invention is provided with a detection accuracy improvement structure. In the detection accuracy improvement structure, mainly, a scattering prevention structure 18 is provided in the region of the intake groove 14 of the base 1 corresponding to the laser component 4 (as shown in FIGS. 3 to 5). Anti-glare structures 19a and 19b are respectively provided on the position of the intake groove 14 corresponding to the projection region of the laser component 4, the first light trap structure 17a and the second light trap structure 17b having a geometric shape in the light trap region 17, and the side housing 17c. This prevents excessive stray light from being directly reflected to the position of the particle sensor 5 after the projection beam emitted from the laser component 4 enters the intake groove 14 and the light trap region 17, thus preventing distortion in the detection accuracy.

[0015] The above-described anti-scattering structure 18 is a passage having a narrow opening 18a at the tip and a reflection structure 18b provided corresponding to the upper part of the particle sensor 5. The narrow opening 18a accelerates the flow of the gas introduced into the intake groove 14, causing the particles contained in the gas to pass intensively through a position orthogonal to the intake groove 14 through the light transmission window 14b by the beam emitted by the laser component 4. The reflection structure 18b can increase the reflection of the particles contained in the gas on the surface of the particle sensor 5. The particle sensor 5 can more easily receive and calculate the projection spot due to scattering, obtain relevant information on the particle size and concentration of the suspended particles contained in the gas, and improve the detection accuracy without distortion.

[0016] The stray light suppression structure 19a at the position of the intake groove 14 is a structure coated with a low-reflection material. A first light trap structure 17a having an oblique conical surface in the light trap region 17, a second light trap structure 17b having a corrugated surface, and a plurality of side housings 17c are each coated with a low-reflection material to form a stray light suppression structure 19b. A light shielding plate 19c for shielding the stray light suppression structure 19b is provided in the light trap region 17. This prevents excessive stray light from being directly reflected to the position of the particle sensor 5 after the projection beam emitted from the laser component 4 enters the position of the intake groove 14 and the light trap region 17, causing distortion in the detection accuracy.

[0017] As described above, the present invention provides a particle detection module. In the particle detection module, mainly, an anti-scattering structure is installed in the region where the intake groove of the base corresponds to the laser component. Further, a stray light suppression structure is installed at the position of the intake groove corresponding to the projection region of the laser component and on the light trap structure having a geometric shape within the light trap region. By doing so, the particle sensor can more easily receive and calculate the projection spot due to the light-scattering particles of the laser, obtain relevant information on the particle size and concentration of the suspended particles contained in the gas, improve the detection accuracy without distortion, improve the detection efficiency of the particle sensor, and has high industrial applicability and progressiveness.

Description of Reference Numerals

[0018] 1: Base 11: First surface 12: Second surface 13: Laser installation area 14: Intake groove 14a: Intake port 14b: Light transmission window 15: Air guiding component mounting area 15a: Vent hole 16: Exhaust groove 16a: Exhaust port 17: Light trap area 17a: First light trap structure 17b: Second light trap structure 17c: Side housing 18: Anti-scattering structure 18a: Narrow opening 18b: Reflection structure 19a, 19b: Stray light suppression structure 19c: Light shield 2: Piezoelectric actuator 3: Drive circuit board 4: Laser component 5: Particle sensor 6: Outer cover 61: Side plate 61a: Intake frame opening 61b: Exhaust frame opening H: Beam path

Claims

1. A particle detection module comprising a base, a piezoelectric actuator, a drive circuit board, a laser component, a particle sensor, a detection accuracy improvement structure, and an outer lid, wherein the base has an intake groove defining an intake path and an exhaust groove defining an exhaust path, a light trapping region is provided in a direction corresponding to the projection beam of the laser component, and on both side walls of the intake groove in a direction orthogonal to the projection beam of the laser component, light transmission windows for the projection beam of the laser component to pass through into the light trapping region penetrate respectively. In the detection accuracy improvement structure, mainly, a scattering prevention structure is provided in a region of the intake groove of the base corresponding to the laser component, and stray light suppression structures are respectively provided for the position of the intake groove corresponding to the projection region of the laser component and the first light trapping structure and the second light trapping structure each having a geometric shape in the light trapping region, so that after the projection beam emitted from the laser component enters the position of the intake groove and the light trapping region, stray light directly reflected to the position of the particle sensor and distortion of detection accuracy are reduced. Particle detection module.

2. The scattering prevention structure is a passage having a narrowed opening at its tip and a reflection structure provided corresponding to above the particle sensor. The narrowed opening accelerates the flow of the gas introduced from the intake groove, and the particles contained in the gas intensively pass through a position orthogonal to the intake groove through the light transmission window by the projection beam emitted from the laser component. The reflection structure increases the reflection of the particles contained in the gas on the surface of the particle sensor, so that the particle sensor more easily receives and calculates the projection spot due to scattering and obtains related information on the particle diameter and concentration of the suspended particles contained in the gas. The particle detection module according to Claim 1.

3. The stray light suppression structure at the position of the intake groove is a structure coated with a low-reflection material. The particle detection module according to Claim 1.

4. The first light trapping structure and the second light trapping structure each have at least one of a frustum of a cone surface, a corrugated surface, or a parabolic surface. The particle detection module according to Claim 1.

5. In the light trapping region, the first light trapping structure having an oblique conical surface, the second light trapping structure having a wavy surface, and a plurality of side casings are provided. The stray light suppression structure installed in the light trapping region is a structure in which a low-reflection material is applied to the first light trapping structure with an oblique conical surface, the second light trapping structure with a wavy surface, and the plurality of side casings. A light shielding plate is provided in the light trapping region. The particle detection module according to claim 4.

6. The first light trapping structure and the second light trapping structure are arranged opposite to each other. The included angle between the first light trapping structure and the second light trapping structure at one end connected to the side casing is an obtuse angle, and the included angle between the first light trapping structure and the second light trapping structure at one end adjacent to the both side walls away from the side casing is an acute angle. The particle detection module according to claim 5.

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