Automotive dust detection sensor

Abstract

The present invention relates to a vehicle dust detection sensor, which can not only easily combine a laser diode module arranged on a PCB substrate with a light receiving part by using a storage device, but also easily adjust the interval between the laser diode module arranged on the PCB substrate and the light receiving part. The module shell constituting the laser diode module is injection molded by heat-resistant plastic material, thereby reducing weight and reducing costs. When optical special plastic material is used, not only can the spot size be achieved to be less than 100㎛, but also a uniform light intensity can be generated by this, thereby minimizing the measurement error of the heat sink.

Description

Technical Field

[0001] The present invention relates to a vehicle dust detection sensor, and more specifically, to a vehicle dust detection sensor having the following characteristics: a housing (case) having a main flow path and a light extinction portion is formed, a laser diode module for irradiating light to a space inside the main flow path is arranged on a PCB substrate equipped on the housing, a light receiving portion for detecting light scattered after the light irradiated from the laser diode module collides with dust is arranged on the PCB substrate, a storage device for fixing the laser diode module and the light receiving portion is combined with the PCB substrate, the storage device is formed with a laser module storage portion for storing the laser diode module, and A light guide portion having a guide hole for guiding light irradiated to the inside of the main flow path is formed in the form of a step difference at the front end of the storage portion, and a light receiving sensor setting portion having a protruding fixing portion is formed on the inner peripheral surface of the setting groove where the light receiving portion is set, so that the laser diode module, the light guide portion and the light receiving sensor setting portion constituting the storage device are formed as a whole. Therefore, not only can the laser diode module set on the PCB substrate be easily combined with the light receiving portion by using the storage device, but also the interval between the laser diode module set on the PCB substrate and the light receiving portion can be easily adjusted. The light is irradiated to the main flow path through the light guide part, so the light receiving part can detect the light scattered after colliding with the dust as accurately as possible. At the same time, the reflector opposite to the laser diode module is arranged on the inner side of the lower part of the extinction part in an upward tilted manner, and a compensation protrusion is formed in a concave-convex shape on the upper part of the extinction part, so that the light flowing into the extinction part through the reflector can be scattered and eliminated, thereby preventing the light passing through the main flow path from flowing back into the main flow path again. The module housing constituting the laser diode module is injection molded with a heat-resistant plastic material, so that the weight can be reduced and the cost can be reduced. When using optical special plastic materials, not only can the spot size be achieved to be less than 100μm, but also uniform light intensity can be generated, thereby minimizing measurement errors. An incident angle adjustment guide is protrudingly formed on the central inner circumferential surface of the module housing to control the incident angle of the laser diode light diverging toward the lens. A heat dissipation hole is formed on the module housing, and the external air flowing through the heat dissipation hole can be used to dissipate the heat of the laser diode. A heat dissipation plate with heat dissipation pins protruding into the internal space of the heat dissipation hole is combined with the inner circumferential surface of the module housing, thereby maximizing the heat dissipation efficiency. Background Art

[0002] Generally speaking, installing a dust sensor in a closed space such as inside a vehicle can detect the concentration of dust in the air, and then using an air purifier to purify the air containing dust, so that the concentration of dust can be managed.

[0003] Figure 7 1 is a schematic diagram showing a conventional dust sensor, wherein reference numeral 1 denotes a housing.

[0004] like Figure 6 As shown, the housing 1 is composed of a lower housing 2 and an upper housing 3. An inlet 8 for air to flow in is formed at the lower end of one side of the lower housing 2, and an outlet 9 for air flowing into the housing 1 to flow out to the outside is formed at the upper part of one end of the upper housing 3.

[0005] A main flow path 10 connecting the inlet 8 and the outlet 9 is formed inside the housing 1 .

[0006] An exhaust fan 13 is provided on the inner peripheral surface of the outlet 9 to force the air flowing into the main flow path 10 to flow out to the outside by the rotation force generated by the motor. Meanwhile, the laser diode 4 is provided to be located on one side of the inner wall of the main flow path 10 .

[0007] The laser diode 4 is provided with a holder 5 at the bottom of the housing 1 . When the laser diode 4 and the holder 5 are combined, they are fixed with a cover.

[0008] In addition, the lens 6 is combined with the holder 5 so as to be spaced apart from the laser diode 4 , thereby collecting the light generated by the laser diode 4 and focusing it toward the inside of the main flow path 10 .

[0009] That is, the laser diode 4 and the support 5 are formed on the inner bottom surface of the housing 1 , thereby ensuring that the laser diode 4 is spaced apart from the lens 6 .

[0010] In this case, it is preferable to set the light collected by the lens 6 so as to be focused at a position eccentric to the inner center of the main flow path 10 or to one side.

[0011] A light receiving unit 7 is provided at the lower portion of the housing 1 corresponding to the light gathering position gathered by the lens 6 . Light is scattered after colliding with dust particles contained in the air passing through the mainstream path 10 , and the scattered light can be detected by the light receiving unit 7 .

[0012] Therefore, the light receiving unit 7 detects light that has collided with dust and has been scattered, thereby being able to detect the dust concentration contained in the air passing through the main flow path 10 .

[0013] In this case, an air guide rib 12 for guiding air to flow toward a position where the light receiving unit 7 is provided is formed on an inner wall 11 on the inlet side of the main flow path 10 so as to be inclined upward.

[0014] The air guide rib 12 is formed at a position opposite to the laser diode 4 , and the light irradiated from the laser diode 4 hits the air guide rib 12 and is reflected to the outside through the inlet 8 and eliminated.

[0015] However, the problem with the existing vehicle dust detection sensor is that the laser diode 5 and the lens 6 must be separately provided on the support 5, which makes it difficult to manufacture the dust sensor.

[0016] In addition, since the laser diode 4 and the lens 6 are separately arranged on the support 5, it is not easy to adjust the interval between the laser diode 4 and the light receiving part 7, thereby causing the problem of being unable to accurately adjust the focal length and prevent light scattering.

[0017] Therefore, the error range of the intensity of the light generated by the laser diode 4 cannot be measured. Summary of the invention

[0018] Technical problems to be solved

[0019] Therefore, in order to solve the above-mentioned problems, the object of the present invention is to provide a vehicle dust detection sensor, which is formed with a shell (case) having a main flow path and a light extinction part, a laser diode module that irradiates light to the inner space of the main flow path is arranged on a PCB substrate equipped on the shell, a light receiving part that detects light scattered after the light irradiated from the laser diode module collides with dust is arranged on the PCB substrate, a storage device that fixes the laser diode module and the light receiving part is combined with the PCB substrate, and the storage device is formed with a laser module storage part that stores the laser diode module, and the light receiving part is provided with a laser module storage part that stores the laser diode module. The light guide portion of the guide hole for guiding the light irradiated into the interior of the main flow path is formed in the front end of the storage portion in the form of a step difference, and a light receiving sensor setting portion with a protruding fixing portion is formed on the inner peripheral surface of the setting groove where the light receiving portion is set, so that the laser diode module, the light guide portion and the light receiving sensor setting portion constituting the storage device are formed into one body. Therefore, not only can the storage device be used to make it easier to combine the laser diode module and the light receiving portion set on the PCB substrate, but also it can make it easier to adjust the interval between the laser diode module and the light receiving portion set on the PCB substrate. The emitted light is irradiated to the main flow path through the light guide part, so the light receiving part can detect the light scattered after colliding with the dust as accurately as possible. At the same time, the reflector opposite to the laser diode module is arranged on the inner side of the lower part of the extinction part in an upward tilted manner, and a compensating protrusion is formed in a concave-convex shape on the upper part of the extinction part, so that the scattering of light flowing into the interior of the extinction part through the reflector can be eliminated, thereby preventing the light passing through the main flow path from flowing back into the interior of the main flow path again. The module shell constituting the laser diode module is injection molded with a heat-resistant plastic material, so that the weight can be reduced and the cost can be reduced. When using When using optical plastic materials, not only can the spot size be achieved to be less than 100μm, but also uniform light intensity can be generated, thereby minimizing measurement errors. An incident angle adjustment guide is protrudingly formed on the central inner circumferential surface of the module housing to control the incident angle of the laser diode light diverging toward the lens. A heat dissipation hole is formed on the module housing, and external air flowing through the heat dissipation hole can be used to dissipate heat from the laser diode. A heat dissipation plate with heat dissipation pins protruding into the internal space of the heat dissipation hole is combined with the inner circumferential surface of the module housing, thereby maximizing the heat dissipation efficiency.

[0020] Solutions to technical problems

[0021] In order to achieve the above-mentioned purpose, the present invention is equipped with:

[0022] The housing has a main flow path for the air containing fine dust to flow and a light-extinguishing portion for eliminating light passing through the main flow path;

[0023] The laser diode module is fixed on a PCB substrate provided inside the housing to ensure that light can be irradiated into the inner space of the main flow path;

[0024] The light receiving unit detects the light scattered after the light irradiated from the laser diode module collides with dust;

[0025] A receiving device combines the laser diode module and the light receiving part to the PCB substrate;

[0026] A reflector is formed on the inner side surface of the housing in a manner opposite to the laser diode module and tilted upward to ensure that the light passing through the main flow path is reflected and guided to the inner space of the extinction part;

[0027] The offsetting protrusion is formed in a concavo-convex shape on the inner side of the upper part of the matte portion to ensure that the light flowing into the matte portion is scattered and eliminated.

[0028] The laser diode module is equipped with:

[0029] The module housing is made of synthetic resin and is injection molded into a cylindrical shape;

[0030] A laser diode is disposed inside the rear end of the module housing;

[0031] The lens is arranged inside the front end of the module housing to ensure that the light generated by the laser diode is gathered and irradiated to the inner space of the main flow path.

[0032] The storage device is equipped with:

[0033] A laser module storage portion, used for storing a laser diode module;

[0034] The light guide part is formed at the front end of the laser module storage part in a step-shaped manner and has a guide hole for guiding light to the inside of the main flow path;

[0035] The light receiving sensor installation part is formed at the front end of the light guide part and includes an installation groove protrudingly formed on the inner peripheral surface of the fixing part that fixes the upper part of the light receiving part.

[0036] The laser module storage portion, the light guide portion and the light receiving sensor setting portion are formed into one body, so that the laser diode module and the light receiving portion can be fixedly combined on the PCB substrate at the same time.

[0037] Effects of the Invention

[0038] According to the present invention, a case having a main flow path and a light extinction portion is formed, a laser diode module for irradiating light to a space inside the main flow path is arranged on a PCB substrate provided on the case, a light receiving portion for detecting light scattered after the light irradiated from the laser diode module collides with dust is arranged on the PCB substrate, a storage device for fixing the laser diode module and the light receiving portion is combined with the PCB substrate, and the storage device forms a laser module storage portion for storing the laser diode module, a light guide portion having a guide hole for guiding light irradiated to the inside of the main flow path is formed in a step-difference form at the front end of the storage portion, a light receiving sensor setting portion having a fixing portion protrudingly formed is formed on the inner peripheral surface of a setting groove where the light receiving portion is arranged, and the laser diode module, the light guide portion, and the light receiving sensor setting portion constituting the storage device are formed in one piece, thereby not only can the laser diode module and the light receiving portion arranged on the PCB substrate be combined more easily by using the storage device, but also the interval between the laser diode module and the light receiving portion arranged on the PCB substrate can be easily adjusted.

[0039] In addition, since the light emitted from the laser diode module is irradiated toward the main flow path through the light guide, the light receiving unit can detect the light scattered after colliding with dust with the greatest accuracy.

[0040] In addition, a reflective plate opposite to the laser diode module is formed on the inner side of the lower part of the extinction portion in an upwardly inclined manner, and a compensating protrusion is formed in a concave-convex shape on the upper part of the extinction portion, so that the light flowing into the interior of the extinction portion through the reflective plate can be scattered and eliminated, thereby preventing the light passing through the mainstream path from flowing back into the mainstream path.

[0041] In addition, the module housing constituting the laser diode module is injection molded with heat-resistant plastic material, thereby reducing weight and cost. When optical-specific plastic material is used, not only can the spot size be controlled to less than 100 μm, but also a uniform light intensity can be generated, thereby minimizing measurement errors.

[0042] In addition, an incident angle adjustment guide is formed protrudingly on the central inner peripheral surface of the module housing to control the incident angle of the laser diode light diverging toward the lens. A heat dissipation hole is formed on the module housing, and the laser diode is radiated by the external air flowing through the heat dissipation hole. A heat dissipation plate having heat dissipation pins protruding into the internal space of the heat dissipation hole is combined with the inner peripheral surface of the module housing, thereby maximizing the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a cross-sectional view of the vehicle fine dust detection sensor of the present invention.

[0044] Figure 2 It is a partially enlarged cross-sectional view of the storage device of the present invention.

[0045] Figure 3 It is a perspective view of the laser diode module of the present invention.

[0046] Figure 4 This is a cross-sectional view of a laser diode module of the vehicle fine dust detection sensor according to the present invention.

[0047] Figure 5 and Figure 6 is a cross-sectional view of a heat sink formed on the laser diode module of the present invention.

[0048] Figure 7 1 is a cross-sectional view showing a conventional vehicle fine dust sensor.

[0049] Description of Reference Numerals

[0050] 1: Shell 2: Lower shell

[0051] 3: Upper housing 4: Laser diode

[0052] 5: Support 6: Lens

[0053] 7: Light receiving part 8: Entrance

[0054] 9: Exit 10: Main road

[0055] 11: Inner wall 12: Light control rib

[0056] 13: Exhaust fan 100: Laser diode module

[0057] 110: module housing 111: joint surface

[0058] 120: through hole 121: coupling groove

[0059] 122: mounting slot 130: incident angle control guide

[0060] 140: heat dissipation hole 141: inlet

[0061] 142: outlet 150: heat sink

[0062] 151: Heat sink 160: Laser diode

[0063] 170: Lens 200: Storage device

[0064] 210: Laser module storage part 211: Light guide part

[0065] 212: light guide hole 220: light receiving sensor installation part

[0066] 221: Setting groove 222: Fixing part

[0067] 230: Reflector 240: Extinction

[0068] 241: Offset protrusions DETAILED DESCRIPTION

[0069] Next, we will use Figures 1 to 6 Preferred embodiments of the present invention are described.

[0070] First, before describing the present invention, the same components as those in the related art are denoted by the same reference numerals, and description of the duplicated reference numerals will be omitted.

[0071] As can be seen from the accompanying drawings, the present invention is equipped with:

[0072] The housing 1 comprises: a main flow path 10 for the flow of air containing fine dust; and a de-lighting portion 240 for eliminating light passing through the main flow path 10;

[0073] The laser diode module 100 is fixed on a PCB substrate 250 provided inside the housing 1 to ensure that light can be irradiated into the internal space of the main flow path 10;

[0074] The light receiving unit 7 detects light scattered after the light irradiated from the laser diode module 100 collides with dust;

[0075] The storage device 200 combines the laser diode module 100 and the light receiving unit 7 to the PCB substrate 250;

[0076] The reflector 230 is formed on the inner side surface of the housing 1 in a manner opposite to the laser diode module 100 and tilted upward to ensure that the light passing through the main flow path 10 is reflected and guided to the inner space of the extinction part 240;

[0077] The cancelling protrusion 241 is formed in a concavo-convex shape on the inner side of the upper portion of the light-extinguishing portion 240 to ensure that the light flowing into the light-extinguishing portion 240 is scattered and canceled.

[0078] The laser diode module 100 is equipped with:

[0079] The module housing 110 is made of synthetic resin and is injection molded into a cylindrical shape;

[0080] The laser diode 160 is disposed inside the rear end of the module housing 110;

[0081] The lens 170 is disposed inside the front end of the module housing 110 to ensure that the light generated by the laser diode 160 is collected and irradiated to the inner space of the main channel 10 .

[0082] The storage device 200 is equipped with:

[0083] The laser module storage portion 210 is used to store the laser diode module 100;

[0084] The light guide portion 211 is formed at the front end of the laser module housing portion 210 in a step-like manner and includes a guide hole 212 for guiding light to the inside of the main channel 10;

[0085] The light receiving sensor setting part 220 is formed at the front end of the light guide part 211 and has a setting groove 221 protrudingly formed on the inner circumference of the fixing part 222 for fixing the upper part of the light receiving part 7. The laser module storage part 210, the light guide part 211 and the light receiving sensor setting part 220 are formed as one body, so that the laser diode module 100 and the light receiving part 7 can be fixedly combined on the PCB substrate 250 at the same time.

[0086] An incident angle adjustment guide 130 is protrudingly formed on the inner circumferential surface of the module housing 110 to ensure that the guide 130 is located between the laser diode 160 and the lens 170 , thereby controlling the incident angle of light emitted from the laser diode 160 to the lens 170 .

[0087] A bonding surface 111 that is closely attached to the PCB substrate 250 is formed on the bottom surface of the module housing 110 along the length direction.

[0088] A plurality of heat dissipation holes 140 are formed along the length direction of the module housing 110 , or the heat dissipation holes 140 are formed in a spiral shape on the module housing 110 . The heat dissipation holes 140 allow external air to flow in and out and can dissipate heat generated by the laser diode 160 .

[0089] A plurality of heat dissipation plates 150 are embedded and coupled to the inner peripheral surface of the module case 110 .

[0090] The heat dissipation pins 151 protruding toward the inner space of the heat dissipation hole 140 are formed on the heat dissipation plate 150 .

[0091] Figure 1 is a cross-sectional view of the vehicle dust detection sensor of the present invention, Figure 2 is a partially enlarged cross-sectional view showing the storage device 200 of the present invention, Figure 3 is a perspective view showing a laser diode module 100 of the present invention, Figure 4 is a cross-sectional view showing a laser diode module according to the present invention.

[0092] The present invention utilizes the storage device 200 to simultaneously fix the laser diode module 100 and the light receiving unit 7 disposed on the PCB substrate 250 , wherein the PCB substrate 250 is disposed inside the housing 1 .

[0093] In addition, the present invention forms the reflector 230 on the lower inner side of the housing 1, i.e., the lower inner side of the extinction portion 240, in a manner opposite to the laser diode module 100 and tilted upward, and a counteracting protrusion 241 is formed in a concave-convex shape on the upper inner side of the extinction portion 240, thereby effectively counteracting the light passing through the main flow path 10, thereby preventing it from re-flowing into the main flow path 10 to the greatest extent.

[0094] like Figure 2 As shown, the storage device 200 for fixing the laser diode module 100 and the light receiving part 7 on the PCB substrate 250 is equipped with: a laser module storage part 210 for storing and fixing the laser diode module 100; a light guide part 211, having a light guide hole 212 for guiding the light irradiated from the laser diode module 100 to the main flow path 10; and a light receiving sensor setting part 220 for fixing the light receiving part 7 for detecting the light scattered after colliding with dust.

[0095] The laser module storage portion 210 , the light guide portion 211 , and the light receiving sensor installation portion 220 constituting the storage device 200 are formed integrally.

[0096] The laser module storage portion 210, the light guiding portion 211 and the light receiving sensor setting portion 220 constituting the storage device 200 are formed as a whole, so that the laser diode module 100 and the light receiving portion 7 fixed on the PCB substrate 250 can be fixed at the same time, thereby significantly reducing the assembly process and thus improving production efficiency.

[0097] In addition, the laser diode module 100 and the light receiving unit 7 are arranged on the PCB substrate 250 at equal intervals by using the laser module storage unit 210 and the light receiving sensor installation unit 220. Thus, the light receiving unit 7 can easily detect the light irradiated to the main channel 10 and scattered after colliding with dust.

[0098] The extinction portion 240 is disposed on one side of the main flow path 10 , and a reflector 230 for reflecting the light of the laser diode module 100 passing through the main flow path 10 and guiding it to the extinction portion 240 is disposed at the lower inner portion of the housing 1 , i.e., below the extinction portion 240 .

[0099] That is, the extinction portion 240 is located at a position opposite to the laser diode module 100 arranged on the PCB substrate 250, that is, inside the housing 1, and a reflective plate 230 that can reflect light irradiated from the laser diode module 100 and guide it to the inside of the extinction portion 240 is formed in an upwardly inclined form at the inner lower part of the extinction portion 240.

[0100] Therefore, the light passing through the main flow path 10 is reflected by the light reflecting plate 230 and guided toward the inner upper portion of the light extinction portion 240 .

[0101] The light guided toward the inner upper portion of the light-extinguishing portion 240 collides with the canceling protrusion 241 formed in a concavo-convex shape on the inner upper portion of the light-extinguishing portion 240 , and is scattered and canceled.

[0102] In addition, if Figure 4 As shown, the laser diode module 100 is equipped with a module housing 110 , a laser diode 160 disposed inside the module housing 110 , and a lens 170 .

[0103] The module housing 110 is injection molded with synthetic resin material, so the module housing 110 is made of heat-resistant plastic or optical special plastic or PC (polycarbonate) or the like.

[0104] like Figure 3 As shown, a through hole 120 is formed in the center of the module shell 110, a coupling groove 121 connected to the through hole 120 is formed at the rear end of the module shell 110, and a mounting slot 122 is formed on the inner side of the front end of the module shell 110 corresponding to the coupling groove 121 and connected to the through hole 120.

[0105] A laser diode 160 connected to the PCB substrate 250 is combined in the combining groove 121 located at the rear end of the module housing 110, and a lens 170 is combined in the installation slot 122 located at the front end of the module housing 110. The lens 170 gathers and irradiates the light generated by the laser diode 160.

[0106] Since the coupling groove 121 and the mounting groove 122 are respectively formed at the front and rear ends, the laser diode 160 and the lens 170 are separated from each other and coupled to the module housing 110 made of synthetic resin.

[0107] Thus, the incident angle adjustment guide 130 is protrudingly formed on the central inner peripheral surface of the module housing 110 where the laser diode 160 and the lens 170 are combined. Figure 3 As shown, the incident angle of the light irradiated to the lens 170 can be controlled.

[0108] Next, a preferred combination state of the present invention constructed in the above-mentioned manner will be described.

[0109] First, the laser diode module 100 and the light receiving unit 7 coupled to the PCB substrate 250 are fixedly coupled by using the receiving device 200 formed by integrating the laser module receiving unit 210 and the light receiving sensor setting unit 220 .

[0110] Power is supplied to the laser diode module 100 and the light receiving unit 7 fixed on the PCB substrate 250 by the storage device 200 to ensure that light is irradiated from the laser diode 160 .

[0111] The light diverged from the laser diode 160 is irradiated to the lens 170 provided inside the front end of the module housing 110 , and the lens 170 collects the irradiated light and focuses it into the main flow path 10 through the light guide portion 211 having a light guide hole 212 constituting the storage device 200 .

[0112] In this case, the light irradiated to the lens 170 is diverged to the lens 170 in a state where the incident angle is controlled by the incident angle adjustment guide 130 protrudingly formed on the inner side surface of the module housing 110 .

[0113] At the same time, under the action of the exhaust fan 13 that is operated by the rotational force of the motor, the air containing dust can flow into the main flow path 10 through the inlet 8 arranged in the outer shell 1. Therefore, after colliding with the light irradiated into the main flow path 10, it will be scattered. The light receiving part 7 detects the scattered light, thereby being able to detect the dust inside the vehicle.

[0114] In addition, the light passing through the main flow path 10 collides with the reflective plate 230 arranged at the inner lower part of the extinction portion 240 in an upwardly inclined manner and then flows into the inner upper part of the extinction portion 240. The light flowing into the inner upper part of the extinction portion 240 collides with the offsetting protrusion 241 and then is scattered and eliminated.

[0115] in addition, Figure 5 and Figure 6 FIG. 1 shows that a heat sink is formed on the module case 110 constituting the laser diode module 100 .

[0116] like Figure 5 As shown in (a), the heat dissipation device has a plurality of heat dissipation holes 140 having an inlet 141 and an outlet 142 formed along the length direction on the module housing 110, or has a heat dissipation hole 140 having an inlet 141 and an outlet 142 formed in a spiral shape.

[0117] In addition, if Figure 6 As shown, a heat dissipation plate 150 having heat dissipation pins 151 protruding toward the inner space of the heat dissipation hole 140 is embedded in the inner circumferential surface of the through hole 120 provided in the module case 110 .

[0118] In this case, although not shown in the drawings, an inflow pipe for allowing air flowing out through the outlet 9 to flow in is connected to the inflow port 141 , and an outflow pipe connected to the internal space through the main flow path 10 is connected to the outflow port 142 .

[0119] As described above, a heat dissipation hole 140 for allowing external air to flow is formed on the module housing 110 injection-molded from a synthetic resin material in which the laser diode 160 is provided, so that the heat generated by the laser diode 160 is dissipated to the outside. Therefore, even if the laser diode 160 is provided inside the module housing 110 made of a synthetic resin, i.e., PC (polycarbonate) material, damage due to heat can be prevented.

[0120] Furthermore, the heat dissipation plate 150 having heat dissipation pins 151 protruding into the inner space of the heat dissipation hole 140 is embedded and coupled to the through hole 120 of the module case 110 , thereby effectively dissipating the heat generated by the laser diode 160 .

Claims

1. A dust detection sensor for a vehicle, characterized in that: The configuration is: A housing (1) comprising: a main flow path (10) for the flow of air containing fine dust; and a light elimination section (240) for eliminating light passing through the main flow path (10); A laser diode module (100) is fixed on a PCB substrate (250) provided inside the housing (1) to ensure that light is irradiated into the internal space of the main flow path (10); A light receiving unit (7) for detecting light scattered after light irradiated from the laser diode module (100) collides with dust; A storage device (200) that combines the laser diode module (100) and the light receiving unit (7) with a PCB substrate (250); a reflector (230) formed on the inner side surface of the housing (1) in a manner opposite to the laser diode module (100) and tilted upward, so as to ensure that light passing through the main flow path (10) is reflected and guided to the inner space of the extinction portion (240); The offsetting protrusion (241) is formed in a concave-convex shape on the inner side of the upper part of the extinction part (240) to ensure that the light flowing into the extinction part (240) is scattered and eliminated. The laser diode module (100) is configured with: The module housing (110) is made of synthetic resin and is injection molded into a cylindrical shape; A laser diode (160) disposed inside the rear end of the module housing (110); A lens (170) is arranged inside the front end of the module housing (110) to ensure that the light generated by the laser diode (160) is concentrated and irradiated to the inner space of the main flow path (10), The storage device (200) is configured with: A laser module storage portion (210) for storing a laser diode module (100); A light guide portion (211) is formed at the front end of the laser module storage portion (210) in a step-difference form and is provided with a guide hole (212) for guiding light to the inside of the main flow path (10); The light receiving sensor setting part (220) is formed at the front end of the light guiding part (211) and has a setting groove (221) protrudingly formed on the inner peripheral surface of a fixing part (222) for fixing the upper part of the light receiving part (7), so that the laser module storage part (210), the light guiding part (211) and the light receiving sensor setting part (220) are formed as one body, so that the laser diode module (100) and the light receiving part (7) can be fixedly combined on the PCB substrate (250) at the same time. An incident angle adjustment guide (130) is protrudingly formed on the inner circumferential surface of the module housing (110) to ensure that the incident angle adjustment guide (130) is located between the laser diode (160) and the lens (170), thereby controlling the incident angle of light emitted from the laser diode (160) to the lens (170). A bonding surface (111) that is closely fitted with the PCB substrate (250) is formed on the bottom surface of the module housing (110) along the length direction. A plurality of heat dissipation holes (140) are formed along the length direction of the module housing (110), or heat dissipation holes (140) are formed in a spiral shape on the module housing (110), wherein the heat dissipation holes (140) allow external air to flow in and out and dissipate heat generated by the laser diode (160). A plurality of heat dissipation plates (150) are embedded and combined on the inner circumferential surface of the module housing (110). A heat dissipation pin (151) protruding toward the inner space of the heat dissipation hole (140) is formed on the heat dissipation plate (150).

Images