KR101916590B1 - Rain sensor including an aspheric lens - Google Patents

Abstract

The present invention discloses a rain sensor including an aspheric lens. According to an aspect of the present invention, there is provided a rain sensor provided on an inner surface of a front windshield of a vehicle, comprising: a light emitting unit emitting light; A light receiving portion for receiving light emitted from the light emitting portion; And a light emitting lens unit for receiving the light emitting unit and converting the light emitted from the light emitting unit in parallel. A reflector for emitting light obliquely to the windshield when the parallel-converted light is incident from the light-emitting lens unit, or for emitting light parallel to the light-receiving unit when the light is obliquely reflected from the windshield; And an aspheric lens protruding in a direction opposite to the windshield is provided in the reflecting portion so that light reflected from the windshield can be refracted to the light receiving portion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rain sensor including an aspheric lens,

The present invention relates to a rain sensor including an aspherical lens, and more particularly, to a rain sensor including an aspheric lens capable of blocking light emitted from the outside and converging light incident on the light receiving unit more accurately.

As shown in FIG. 1, the wiper control system using the rain sensor detects the amount of rainfall in the rain sensor and the unit provided on the upper inner surface of the windshield glass, so that the operation time of the wiper And speed (LOW / HIGH).

1 is a view for explaining a wiper control system using a rain sensor according to the related art.

Referring to FIG. 1, a wiper control system using a rain sensor according to the related art includes a wiper drive motor 12, a rain sensor 10, and a lane sensor 10 for outputting a wiper motor drive signal, And a sensor unit (11). According to this, the rain sensor 10 senses the water droplets formed on the windshield at the time of rainstorm and senses whether the rain is coming or not, or whether there is a lot of rain or not, and is used as a signal to drive the wiper.

However, in the rain sensor according to the related art, since the light emitting portion and the light receiving portion are exposed on the substrate, they can be affected by disturbance light. At this time, the disturbance light may be collectively referred to as light other than self light emission. Therefore, the rain sensor according to the related art has a problem that the accuracy of sensing rainwater is lowered due to the influence of disturbance light.

Korean Patent No. 10-0638299 (published on October 18, 2006) Korean Registered Patent No. 10-0981215 (Announced on September 10, 2010)

It is an object of the present invention to provide a rain sensor including an aspherical lens having a structure capable of shielding disturbance light and a lens for more accurately converging light incident on a light receiving unit have.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by one embodiment of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a rain sensor provided on an inner surface of a front windshield of a vehicle, the rain sensor including: a light emitting unit emitting light; A light receiving portion for receiving light emitted from the light emitting portion; And a light emitting lens unit for receiving the light emitting unit and converting the light emitted from the light emitting unit in parallel. A reflector for emitting light obliquely to the windshield when the parallel-converted light is incident from the light-emitting lens unit, or for emitting light parallel to the light-receiving unit when the light is obliquely reflected from the windshield; And an aspheric lens protruding in a direction opposite to the windshield is provided in the reflecting portion so that light reflected from the windshield can be refracted to the light receiving portion.

The light-emitting unit light-blocking module may include a structure having an outer wall that surrounds the outer side of the light-emitting unit, so that the disturbance light may be blocked.

The light-emitting unit light-shielding module includes: a body portion having a hollow space formed at a center thereof to receive the light-emitting portion; And a cover portion coupled to an upper portion of the body portion.

Wherein the cover portion is in close contact with the body portion through a contact portion, the contact portion includes two or more surfaces having different directions from each other, and when the cover portion and the body portion are coupled, So as to be brought into contact with the contact portion.

The light emission lens unit may be formed integrally with the cover unit.

Wherein the light emitting lens portion has a planar portion on an outer side in the windshield direction and a plurality of concentric toothed wheels on the inner side opposite to the planar portion and the concentric inner side of the concentric toothed wheel structure is a Fresnel lens shape, The outside may be in the form of a Fresnel reflector.

Wherein the reflector has a planar portion facing the light emitting portion, a portion facing the light receiving portion is provided with the aspheric lens, a direction toward the windshield is formed in a plurality of sawtooth shapes, Lt; / RTI >

According to another aspect of the present invention, there is provided a rain sensor provided on an inner surface of a front windshield of a vehicle, the rain sensor including: a light emitting unit emitting light; A light receiving unit for receiving light emitted from the light emitting unit; And a refraction unit that receives the light emitting unit and refracts the light emitted from the light emitting unit in parallel. And a reflector that reflects light emitted from the windshield in a direction parallel to the light receiving unit when the parallel light is refracted by the refracting unit and is obliquely emitted from the windshield, ; And a refracting portion that receives the light receiving portion and refracts the light emitted in parallel from the reflecting portion to concentrate on the light receiving portion. The light emitting portion light intercepting module and the light receiving portion light intercepting module The included refracting portion may be an aspherical lens structure.

The refracting portion may have a planar shape toward the windshield, and the portion facing the light emitting portion and the light receiving portion may be a convex aspherical lens structure.

The light emitting unit light blocking module and the light receiving unit light blocking module may include a body portion having a hollow space formed at the center thereof so as to receive the light emitting portion therein; And a cover portion coupled to an upper portion of the body portion.

The body portion may extend in a wall shape surrounding the inside, and the cover portion may be coupled to the extended end portion of the body portion, and the cover portion may be formed in a plate shape.

The aspherical lens structure may have an aspheric lens portion whose center is convex toward the substrate, and both outer sides of the rim of the aspheric lens portion may be inclined.

The light emitting portion and the cover portion facing the light receiving portion are positioned with a central portion located at the center thereof and a rim portion located along the rim of the central portion, and the refracting portion is provided with a convex portion extending from the rim portion toward the center portion, .

The refracting portion may be formed of an aspherical lens.

On both sides of the cover portion, coupling protrusions are formed to protrude upward from the body portion, and an insertion portion is formed on the upper side of the body portion so that the coupling protrusions are inserted and coupled.

According to an aspect of the present invention, it is possible to improve the sensing accuracy of rainwater detection by blocking disturbance light.

In addition, by positioning the aspheric lens at a lower portion of the reflection portion located in the upper direction of the light receiving portion, the parallel light incident on the reflection portion is refracted and converged to be incident on the light receiving portion.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the specific details for carrying out the invention, And shall not be construed as limited to the matters described.
1 is a view for explaining a wiper control system using a rain sensor according to the related art,
2 is a sectional view of a rain sensor according to an embodiment of the present invention,
3 is an exploded perspective view of a light blocking module according to an exemplary embodiment of the present invention,
4 is a cross-sectional view of a combined light blocking module according to one embodiment of the present invention,
5 is an enlarged view of a contact portion of a light blocking module according to an embodiment of the present invention,
6 is an enlarged view of a contact portion of a light blocking module according to another embodiment of the present invention,
FIG. 7 is an exploded perspective view of a light blocking module according to another embodiment of the present invention, FIG.
8 is a sectional view of a rain sensor according to another embodiment of the present invention,
9 is a view for explaining the structure of a light blocking module according to another embodiment of the present invention;
10 is a view for explaining a structure of a light blocking module in which a cover part is coupled to a body part according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. In addition, the term "Quot; and " part " refer to a unit that processes at least one function or operation, which may be implemented in hardware, software, or a combination of hardware and software.

2 is a cross-sectional view of a rain sensor according to an embodiment of the present invention.

The rain sensor according to the present embodiment may be provided on the upper inner surface of the front windshield 700 of the vehicle. The rain sensor senses the presence or absence of raindrops falling on the front windshield 700 and provides information for driving the wiper. On the other hand, since the rain sensor has a servo circuit for correcting the glass transmittance by itself, it can have a function of detecting rainwater constantly regardless of the transmittance of the front windshield 700 of the vehicle.

2, the rain sensor includes a light emitting unit 100, a light receiving unit 200, a light emitting unit light intercepting module 300, an aspherical lens 501, and a reflector 500.

The light emitting portion 100 may be mounted on the substrate 600 to emit light. At this time, the light may be infrared rays. The substrate 600 may be a printed circuit board (PCB). The light emitting unit 100 may be a light emitting diode (LED).

The light receiving unit 200 may be mounted on the substrate 600 to receive light emitted from the light emitting unit 100. The light receiving unit 200 may be spaced apart from the light emitting unit 100 by a predetermined distance. More specifically, the light receiving unit 200 may be installed at a position where the light emitted through the light emitting unit 100 according to the embodiment of the present invention is totally reflected by the front windshield 700 of the vehicle. The light receiving unit 200 may be a photodiode. The rain sensor measures the intensity of light incident on the light receiving unit 200 when the light emitted through the light emitting unit 100 is totally reflected by the front windshield 700 of the vehicle and enters the light receiving unit 200, Can be detected. Although not shown in the present embodiment, a seating part (not shown) for seating the member (the light emitting part and the light receiving part) may be positioned below the light emitting part 100 and the light receiving part 200. The mounting portion may be detachably coupled to the body 320 described below and may be electrically connected to the light emitting portion 100 and / or the light receiving portion 200.

The light emitting unit light blocking module 300 may internally receive the light emitting unit 100 to block external light, that is, disturbance light. Here, the disturbance light may be collectively referred to as light other than self-emission (infrared rays emitted from the light emitting unit 100). The light-emitting unit light blocking module 300 may include a light emitting lens unit 310 for converting the light emitted from the light emitting unit 100 in parallel. At this time, the light emitting lens unit 310 may be formed on the upper part of the light emitting unit light blocking module 300 in the direction of the windshield 700. The light emitting lens unit 310 may reflect or refract light emitted from the light emitting unit 100 toward the windshield 700. [ In other words, the light emitting lens unit 310 can convert the light emitted from the light emitting unit 100 in parallel to the windshield 700. The light emitting lens unit 310 may include a Fresnel lens structure and a Fresnel reflector structure on one side in the direction of the windshield 700 and on the other side opposite to the one side, that is, in the direction of the substrate 600. At this time, the Fresnel lens structure and the Fresnel reflector structure may have a plurality of teeth in a saw-tooth shape. More specifically, the Fresnel lens structure may be formed at a central portion of the light emitting lens unit 310 to refract incident light. The Fresnel lens structure may be formed on both sides of the Fresnel lens structure to reflect and / or refract incident light. In other words, the Fresnel lens structure and the Fresnel lens structure reflect or reflect the light emitted from the light emitting unit 100 in a direction perpendicular to the light emitting lens unit 310, toward the windshield 700 Can be released. At this time, the inclined angle of the tooth form of the structures (the Fresnel lens structure and the Fresnel reflector structure) formed in the light emission lens part 310 is such that the light incident from the light emission part 100 is perpendicular to the light emission lens part 310 Can be predefined to implement parallel light while passing through.

A more detailed description related to the light-emitting unit light blocking module 300 will be described later with reference to FIG. 3 to FIG.

The reflection unit 500 may include a reflection unit 500a formed on the upper side of the light-emitting unit light blocking module 300 and a reflection unit 500b formed on the upper side of an aspheric lens 501 to be described later . At this time, the reflection part 500a may reflect the light incident from the light-emitting part light blocking module 300 to the windshield 700. [ In other words, when the parallel-converted light from the light emitting lens unit 310 is incident on the reflector 500a, the reflector 500a can be obliquely emitted to the windshield 700. [ The reflection portion 500b may receive the light totally reflected from the windshield 700 and reflect the light to the light receiving portion 200 side. In more detail, the reflector 500b receives the light totally reflected from the windshield 700 and obliquely enters the reflector 500b, and reflects the light to the aspheric lens 501, which will be described later. The reflectors 500a and 500b are planar portions on one side in the direction of the substrate 600 and a Fresnel reflector structure having a plurality of sawtooth shapes on the other side opposite to the one side, . In other words, the reflective portions 500a and 500b are formed in a planar shape toward the light emitting portion 100 and the light receiving portion 200, the direction toward the windshield 700 is formed in a plurality of toothed wheels, The shape may be in the form of a Fresnel reflector. The inclination angle of the Fresnel reflector structure of the Fresnel reflector structure included in the reflector 500a formed on the upper side of the light-emitting unit light shielding module 300 is determined such that light directed toward the windshield 700 is transmitted to the windshield 700 The total reflection can be defined in advance. The coupling portion 800 may be positioned between the windshield 700 and the reflection portion 500. At this time, the coupling part 800 may be silicon. In other words, the windshield 700 and the reflector 500 may be closely contacted by the silicon as the silicon is positioned therebetween.

The aspherical lens 501 can receive the light reflected from the windshield 700. More specifically, the aspherical lens 501 can receive the light reflected from the reflecting portion 500b receiving the light reflected from the windshield 700 and refract the light to the light receiving portion 200. [ The aspheric lens 501 may be formed below the reflective portion 500b. In other words, the aspheric lens 501 may be formed below the reflection part 500b located in the upper direction of the light receiving part 200. [ One side of the aspherical lens 501 may be a parabolic surface and / or a hyperboloid. The aspherical lens 501 can receive the parallel light reflected and / or refracted from the reflector 500b and converge it to exactly one point. That is, when the aspheric lens 501 is used, the parallel light reflected and / or refracted from the reflecting portion 500b can be incident on the light receiving portion 200 accurately. Meanwhile, the aspheric lens 501 and the reflection part 500b may be bonded by an adhesive member (not shown) such as silicon. At this time, the bonding member is not limited to silicon, and it does not matter whether the aspherical lens 501 and the reflecting portion 500b are bonded to each other and does not affect light incident on the reflecting portion 500b. Since the aspherical lens 501 is formed of a spherical surface and a curved surface (e.g., a parabolic surface, a hyperbolic surface, an elliptical surface, or the like) that is not a plane surface, it is possible to emit the received light so that the received light is more accurately converged on the target point. According to the above description, the assembly of the aspheric lens 501 on the upper side of the light receiving unit 200 can be simplified by attaching the aspheric lens 501 to the lower part of the reflection unit 500b through the silicon. In addition, the cost of assembling can be reduced.

FIG. 3 is an exploded perspective view of a light blocking module according to an embodiment of the present invention, and FIG. 4 is a sectional view of a combined light blocking module according to an embodiment of the present invention.

In describing the present embodiment, the light blocking module may mean a light emitting unit light blocking module 300 that receives the light emitting unit 100 therein.

3 to 4, the light intercepting module 300 according to the present embodiment may include a body portion 320 and a cover portion 330.

The body portion 320 may be mounted on the substrate 600. The body portion 320 may have a hole 321 formed at the center thereof. The hole 321 may be an empty space and the light emitting unit 100 and / or the light receiving unit 200 may be accommodated in the hole 321. The light emitting portion 100 may be accommodated in the hole 321.

The cover portion 330 may be coupled to the upper portion of the body portion 320. The light emitting lens unit 310 may be integrally formed on one side of the upper end of the cover unit 330, that is, in the direction of the windshield 700.

According to the above description, the light blocking module 300 may block the disturbance light by forming the outer wall 340 as the body 320 and the cover 330 are coupled. More specifically, the light shielding module 300 is formed of a structure having an outer wall that surrounds the outside of the light emitting portion 9100, so that the inflow of extraneous light can be blocked. The light shielding module 300 having the body part 320 and the cover part 330 coupled thereto may have a cylindrical shape. However, the present invention is not limited thereto, and the light blocking module 300 may have any shape as long as the outer wall 340 capable of shielding disturbance light is formed.

FIG. 5 is an enlarged view of a contact portion of a light blocking module according to an embodiment of the present invention, and FIG. 6 is an enlarged view of a contact portion of the light blocking module according to another embodiment of the present invention.

In describing the present embodiment, the light blocking module may mean a light emitting unit light blocking module 300 that receives the light emitting unit 100 therein.

5A and 5B, when the body 320 and the cover 330 are coupled to each other, the light intercepting module 300 according to the present embodiment includes a contact portion 510 May be provided in a shape capable of blocking disturbance light. 5 (a) and 5 (b), the contact portions 510 and 520, which are in contact with the body portion 320 and the cover portion 330, Can be formed correspondingly in a zigzag form. More specifically, when the contact portion of the cover portion 330 is referred to as a first contact portion 510 and the contact portion of the body portion 320 is referred to as a second contact portion 520, The first contact part 510 and the second contact part 520 (see FIG. 5B) are formed in the shape of a letter "A", and the second contact part 520 is formed in a " It is possible to prevent the disturbance light from penetrating into the inside of the light blocking module through the clearance s that may occur even if the light blocking module is coupled. That is, even if disturbance light penetrates through the gap (s) when the gap (s) is generated, the disturbance light is blocked in the bent portion and the disturbance light can no longer penetrate into the light interception module. In other words, the cover portion 330 is in close contact with the body portion 320 through the contact portions 510 and 520, and the contact portions 510 and 520 include two or more surfaces having different directions from each other, When the body 300 and the body 300 are coupled to each other, two or more faces having different directions may face each other and may be brought into contact with each other at the contacts 510 and 520.

6 (a) and 6 (b), the contact portion 510 of any one of the contact portions 510 and 520 of the body portion 320 or the cover portion 330 has a constant And the other contact portion 520 corresponding to the contact portion 510 may have a groove 540 corresponding to the projection 530 in the inside thereof, It is possible to shape the protrusion 530. For example, when the contact portion 510 of the cover portion 330 includes a protrusion 530 having a predetermined height or more in the center, the contact portion 520 of the body portion 320 may correspond to the protrusion 530 And may include a groove 540 formed therein to surround the protrusion 530. 6 (b), when the body portion 320 and the contact portions 510 and 520 of the cover portion 330 are engaged with each other, even if a clearance s occurs, 530 may block the disturbance light.

In addition, when a foreign object such as dust adheres to the light emitting unit 100, the rain sensor may deteriorate the sensing performance of the sensor or malfunction the sensor. However, according to the present embodiment as described above, the light shielding module 300 can prevent the foreign material such as dust from being buried by providing the light emitting portion 100 therein. The light blocking module 300 may be integrally formed with the body 320 and the cover 300 so as to separate the body 320 and the cover 300. As a result, It is possible to separate only the unit 300 and check the abnormality. Therefore, since the body 320 is not separated from the substrate 600, it is possible to prevent the substrate from being damaged due to the separation of the body 320 from the substrate 600.

Meanwhile, according to the present embodiment, the Fresnel lens (the light emitting lens part and the reflecting part) 310 and 500 may be made of a plastic material. Further, the Fresnel lenses 310 and 500 may be manufactured using a silicon wafer. Silicon wafers have the property of transmitting infrared rays, and the sensitivity can be increased by focusing infrared rays.

In addition, a sunlight cutoff filter (not shown) that can block sunlight may be further provided inside the aspherical lens 501. Accordingly, the light emitting unit 100 may emit light totally reflected by the windshield 700 to block light other than infrared rays, thereby improving the sensing accuracy of rainwater sensing.

According to the present invention as described above, the light-emitting unit light-blocking module 300 accommodating the light-emitting unit 100 is provided to block disturbance light, thereby detecting rainwater through only light emitted from the light- It is possible to improve the accuracy of rainwater detection sensing. By placing the aspheric lens 501 at the lower part of the reflection part 500b, the parallel light incident on the reflection part 500b is refracted and converged so as to be incident on the light receiving part 200, Can be further improved.

7 is an exploded perspective view of a light blocking module according to another embodiment of the present invention.

Referring to FIGS. 7A and 7B, the light blocking module 710 according to the present embodiment may include a body portion 711 and a cover portion 713. At this time, a hole 720 for receiving the light emitting portion 100 may be formed at the center of the body portion 711. The hole 720 may be an empty space and the light emitting unit 100 and / or the light receiving unit 200 may be accommodated in the hole 321. The body part 711 may extend in the form of a wall enclosing the inside and the cover part 713 may be coupled to the extended end of the body part 711. The cover portion 713 may be formed in a plate shape. At this time, since the cover portion 713 is formed in a plate shape, the cover portion 713 is advantageous in manufacturing.

The cover portion 713 may be coupled to the upper portion of the body portion 711. In addition, the light emitting lens unit 310 may be included at the upper end of the cover unit 713 according to the present embodiment, that is, at one side in the direction of the windshield 700, as shown in FIG. More specifically, the cover portion 713 includes a protrusion 714, and the body portion 711 may include a receiving portion 712 corresponding to the protrusion 714. At this time, the protrusion 714 may protrude from a lower portion of the cover portion 713, that is, a lower portion of the lower portion of the body portion 711. The receiving portion 712 may be formed in a shape corresponding to the protruding portion 712 and may be recessed at an outer portion of the upper portion of the body portion 711, that is, at an outer portion of the upper portion in the direction of the cover portion 713. The cover portion 713 and the body portion 711 can be engaged with each other as the protrusion 714 of the cover portion 713 is fitted into the receiving portion 712 of the body portion 711 . In other words, the wall of the body portion 711 is provided with a recessed receiving portion 712 for receiving the protruding portion 714, so that the protruding portion 714 can be engaged with and engaged with the receiving portion 712. As described above, when the protrusion 714 and the receiving portion 712 are engaged with each other, the body portion 711 and the cover portion 713 can be prevented from being misjudged, and the coupling can be made more robust. Further, since the projecting portion 714 and the accommodating portion 712 have a bent shape, the penetration of the disturbance light can be prevented more effectively than when the plate-shaped cover portion 713 is put on the body portion. That is, when the plate-like cover part 713 is placed on the body part, light can enter through the clearance. However, since the protrusion part 714 and the receiving part 712 are in the form of oval- When the cover portion 713 is engaged, the light can be blocked by the curved shape, so that penetration of the outside sight can be prevented more effectively. At this time, it is explained that there are two protruding portions 714 according to the present embodiment and a receiving portion 712 coupled with the protruding portion 714, but the number is not limited thereto. The shape of the cover 713 and the body 711 is a rectangular shape but is not limited thereto. If the cover 713 and the body 711 can be combined, It does not matter.

Although not shown in the present embodiment, a seat portion (not shown) for seating the member (light emitting portion and light receiving portion) is disposed below the light emitting portion 100 included in the light blocking module 710 can do. The seat portion may be detachably coupled to the body portion 711, and may be electrically connected to the light emitting portion 100.

The light blocking module 710 shown in FIG. 7 is different from the light blocking module 300 shown in FIG. 2 in that a device (more specifically, a light receiving unit) 713). That is, since the body portion 711 of the light intercepting module 710 as shown in FIG. 8 is elongated in a wall shape that surrounds the inner side and is further away from the light receiving portion, the effect of disturbance light can be minimized .

In addition, although the light sensor according to the above description has the light shielding module only on the side of the light emitting portion, the light shielding module may be located on the light emitting portion and / or the light receiving portion side. Also, although the reflection and refraction portions included in the light blocking module are described as Fresnel structures, aspherical lenses may be applied. A more detailed description thereof will be given later with reference to FIG.

8 is a sectional view of a rain sensor according to another embodiment of the present invention.

The rain sensor according to the present embodiment may be provided on the upper inner surface of the front windshield 700 of the vehicle. The rain sensor senses the presence or absence of raindrops falling on the front windshield 700 and provides information for driving the wiper. On the other hand, since the rain sensor has a servo circuit for correcting the glass transmittance by itself, it can have a function of detecting rainwater constantly regardless of the transmittance of the front windshield 700 of the vehicle.

8, the rain sensor according to the present embodiment includes a light emitting unit 100, a light receiving unit 200, a light emitting unit light blocking module 300, a light receiving unit light blocking module 400, and a reflector 500 .

The light emitting portion 100 may be mounted on the substrate 600 to emit light. At this time, the light may be infrared rays. The substrate 600 may be a printed circuit board (PCB). The light emitting unit 100 may be a light emitting diode (LED).

The light receiving unit 200 may be mounted on the substrate 600 to receive light emitted from the light emitting unit 100. The light receiving unit 200 may be spaced apart from the light emitting unit 100 by a predetermined distance. More specifically, the light receiving unit 200 may be installed at a position where the light emitted through the light emitting unit 100 according to the embodiment of the present invention is totally reflected by the front windshield 700 of the vehicle. The light receiving unit 200 may be a photodiode. The rain sensor measures the intensity of light incident on the light receiving unit 200 when the light emitted through the light emitting unit 100 is totally reflected by the front windshield 700 of the vehicle and enters the light receiving unit 200, Can be detected. Although not shown in the present embodiment, a seating part (not shown) for seating the member (the light emitting part and the light receiving part) may be positioned below the light emitting part 100 and the light receiving part 200. The seat portion may be detachably coupled to the body portion 320 and may be electrically connected to the light emitting portion 100 and / or the light receiving portion 200.

The light emitting unit light blocking module 300 may internally receive the light emitting unit 100 to block external light, that is, disturbance light. Here, the disturbance light may be collectively referred to as light other than self-emission (infrared rays emitted from the light emitting unit 100). The light-emitting portion light blocking module 300 may include a refracting portion 311a for refracting the light emitted from the light emitting portion 100 in parallel. At this time, the refracting portion 311a may be formed on the upper portion of the light-emitting portion light blocking module 300 in the direction of the windshield 700. [ The refracting portion 311a may refract the light emitted from the light emitting portion 100 toward the windshield 700. One side of the refracting portion 311a in the direction of the windshield 700 is a flat surface portion and an aspherical lens structure convex in the direction of the substrate may be formed on the other side opposite to the one side, The aspherical lens structure may be in the shape of a peak whose center is convex toward the substrate and inclined to both sides of the center. The aspherical lens structure may refract light emitted from the light emitting portion 100 in a direction perpendicular to the refracting portion 311a and emit the light toward the windshield 700.

The reflective portion 500 is deflected by the refracting portion 311a, and when the parallelly converted light is incident, the reflection portion 500 can be released at an angle to the windshield 700. [ When the reflection portion 500 is reflected from the windshield 700 and inclines obliquely, light can be emitted parallel to the light receiving portion 200 side. The reflection unit 500 includes a reflection unit 500a formed on the upper side of the light emitting unit light blocking module 300 and a reflection unit 500b formed on the upper side of the light receiving unit light blocking module 400 . At this time, the reflection part 500a may reflect the light incident from the light-emitting part light blocking module 300 to the windshield 700. [ In other words, the reflector 500a can receive the refracted light from the refracting portion 311a and reflect the refracted light to the windshield 700. [ The reflection portion 500b may receive the light totally reflected from the windshield 700 and reflect the light to the light receiving portion 200 side. More specifically, the reflector 500b may receive the light totally reflected from the windshield 700 and reflect the light to the refracting portion 311b of the light receiving unit light intercepting module 400 to be described later. The reflectors 500a and 500b are planar portions on one side in the direction of the substrate 600 and a Fresnel reflector structure having a plurality of sawtooth shapes on the other side opposite to the one side, . The inclination angle of the Fresnel reflector structure of the Fresnel reflector structure included in the reflector 500a formed on the upper side of the light-emitting unit light shielding module 300 is determined such that light directed toward the windshield 700 is transmitted to the windshield 700 The total reflection can be defined in advance. The inclination angle of the sawtooth shape of the Fresnel reflector structure included in the reflector 500b formed on the upper side of the light receiving unit light intercepting module 400 is set such that the refracting portion 311b of the light intercepting light intercepting module 400 Can be previously determined so that light directed toward the refracting portion 311b can be emitted perpendicular to the refracting portion 311b. The coupling portion 800 may be positioned between the windshield 700 and the reflection portion 500. At this time, the coupling part 800 may be silicon. In other words, the windshield 700 and the reflector 500 may be connected by the silicon as the silicon is positioned therebetween.

The light receiving unit light intercepting module 400 includes a refracting unit 311b that receives the light receiving unit 200 and refracts the light emitted from the reflecting unit 500 in parallel to the light receiving unit 200 . The light receiving unit light intercepting module 400 may internally receive the light receiving unit 200 to block external light, that is, disturbance light. Here, the disturbance light may be collectively referred to as light other than self-emission (infrared rays emitted from the light emitting unit 100). The light receiving unit light intercepting module 400 includes a refracting unit 311b that can receive the light receiving unit 200 and refract the light reflected from the reflecting unit 500b to the light receiving unit 200 . At this time, the refracting portion 311b may be formed on the upper portion of the light receiving unit light intercepting module 400 in the direction of the windshield 700. One side of the refracting portion 311b in the direction of the windshield 700 is a flat surface portion and an aspherical lens structure convex in the direction of the substrate may be formed on the other side opposite to the one side, In other words, the refracting portion 311b is planar in the direction toward the windshield 700, and the portion facing the light emitting portion 100 and the light receiving portion 200 may be a convex aspherical lens structure. The aspherical lens structure may be in the shape of a peak whose center is convex toward the substrate and inclined to both sides of the center. The aspherical lens structure may refract the light incident from the reflective portion 500b to the light receiving portion 200. [ 3 and 7, the light emitting lens unit 310 is changed to the refracting units 311a and 311b in the light emitting unit light blocking module 300 and / or the light receiving unit light blocking module 400 according to the present embodiment. The above-described structure and function may be the same. According to the above description, since the aspherical lens structure is used as the reflecting portion, the light can be more accurately converged, and the accuracy of sensing can be improved.

9 is a view for explaining a structure of a light blocking module according to another embodiment of the present invention.

In describing the present embodiment, the light shielding module may have the same shape, but only the name of its structure differs according to elements (for example, a light emitting portion and / or a light receiving portion) included therein. 9, the light blocking module may be any one of the light emitting unit light blocking module 300 and / or the light receiving unit light blocking module 400.

Referring to FIG. 9, the light blocking module according to the present embodiment may have a cylindrical shape. At this time, the light blocking module may have a hole 901 formed therein. The first opening portion 902 and the second opening portion 903 are formed so that one side and the other side of the hole 901 are opened and the first opening portion 902 is positioned to cover the cover portion 904, 2 seating portion 905 is seated in the opening portion 903. [ Here, the hole 901 may be formed to have a larger cross-sectional area as it goes toward the first opening 902. As a result, the first opening 902 is formed to have a larger diameter than the second opening 903, and the inner peripheral edge of the side wall portion 906 facing the hole 901 is formed in the direction of the first opening 902 An inclined side portion 907 inclined toward the outer side is formed. The refracting portion 908 may be located inside the cover portion 904 facing the element (the light emitting portion 100 and / or the light receiving portion 200). The refracting portion 908 may include a central portion 909 located at the center thereof and a rim portion 910 located along the rim of the central portion 909. The refraction portion 908 may be formed to be convex in the direction of the center portion 909 from the rim portion 910. The refracting portion 908 may be an aspherical lens.

10 is a view for explaining a structure of a light blocking module in which a cover part is coupled to a body part according to another embodiment of the present invention.

In describing the present embodiment, the light shielding module may have the same shape, but only the name of its structure differs according to elements (for example, a light emitting portion and / or a light receiving portion) included therein. 10, the light blocking module may be any one of the light emitting unit light blocking module 300 and / or the light receiving unit light blocking module 400.

Referring to FIG. 10, engagement protrusions 1004 protrude from the upper side of the body 1002, that is, toward the upper side of the side wall 1003, on both sides of the cover 1001. An insertion portion 1005 is formed concavely on the upper side of the side wall portion 1003 so as to insert the coupling projection 1004 therein. Since the engaging protrusion 1004 is formed on the cover 1001 and the inserting portion 1005 is formed on the side wall 1003, the effect that the cover 1001 is coupled to the body 1002 with a simple structure have.

While the specification contains many features, such features should not be construed as limiting the scope of the invention or the scope of the claims. In addition, the features described in the individual embodiments herein may be combined and implemented in a single embodiment. On the contrary, the various features described in the singular embodiments may be individually implemented in various embodiments or properly combined.

Although the operations are described in a particular order in the figures, it should be understood that such operations are performed in a particular order as shown, or that all described operations are performed in a series of sequential orders, or to obtain the desired result. In certain circumstances, multitasking and parallel processing may be advantageous. It should also be understood that the division of various system components in the above embodiments does not require such distinction in all embodiments. The above-described application components and systems can generally be packaged into a single software product or multiple software products.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

100:
200:
300: light emitting portion light blocking module
310:
311a, 311b:
320, 711:
321, 720: holes
330, and 713:
340: outer wall
400: Light receiving section light blocking module
500a, 500b:
501: Aspheric lens
510: first contact
520: second contact
530: projection
540: Home
600: substrate
700: Windshield
712:
714:
800:

Claims (15)

A rain sensor provided on an inner surface of a front windshield of a vehicle,
A light emitting portion emitting light;
A light receiving unit for receiving light emitted from the light emitting unit;
And a light emitting lens unit for receiving the light emitting unit and converting the light emitted from the light emitting unit in parallel.
A reflector for emitting light obliquely to the windshield when the parallel-converted light is incident from the light-emitting lens unit, or for emitting light parallel to the light-receiving unit when the light is obliquely reflected from the windshield; And
And an aspheric lens protruded in a direction opposite to the windshield is provided in the reflecting portion to refract the light reflected from the windshield to the light receiving portion,
The light-emitting-section light-
A body portion having a hollow space formed at a center thereof to receive the light emitting portion therein; And
And a cover portion coupled to an upper portion of the body portion,
The cover portion is in close contact with the body portion through a contact portion,
Wherein the contact portion includes two or more surfaces having different directions from each other,
And an aspherical lens for allowing two or more surfaces of the mutually facing directions to face each other and to be brought into contact with each other at the contact portion when the cover portion and the body portion are engaged. The method according to claim 1,
The light-emitting-section light-
And an outer wall surrounding the outer side of the light emitting portion, so that the inflow of extraneous light can be cut off. The method according to claim 1,
The reflector includes:
Wherein the portion facing the light emitting portion is planar and the portion facing the light receiving portion is provided with the aspheric lens,
The direction toward the windshield is formed in a plurality of gears,
Wherein the toothed wheel structure is in the form of a Fresnel reflector. A rain sensor provided on an inner surface of a front windshield of a vehicle,
A light emitting portion emitting light;
A light receiving unit for receiving light emitted from the light emitting unit;
And a light emitting lens unit for receiving the light emitting unit and converting the light emitted from the light emitting unit in parallel.
A reflector for emitting light obliquely to the windshield when the parallel-converted light is incident from the light-emitting lens unit, or for emitting light parallel to the light-receiving unit when the light is obliquely reflected from the windshield; And
And an aspheric lens protruded in a direction opposite to the windshield is provided in the reflecting portion to refract light reflected from the windshield to the light receiving portion,
The light-emitting-section light-
A body portion having a hollow space formed at a center thereof to receive the light emitting portion therein; And
And a cover portion coupled to an upper portion of the body portion,
The light emission lens unit is integrally formed with the cover unit,
The light-
Wherein the outer side in the windshield direction is a plane portion and the inner side opposite to the plane portion has a plurality of concentric toothed wheels, the concentric inner side of the concentric toothed wheel structure is a Fresnel lens shape, Wherein the aspherical lens has an aspheric surface.
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