Total reflection rainfall sensor

Abstract

The utility model relates to a total reflection rainfall sensor which is installed on the inner side of glass, the outer surface of the glass serves as a glass total reflection surface, the rainfall sensor comprises a transparent plate and a protective shell which are connected with each other, an installation cavity is formed between the transparent plate and the protective shell, and an emission source and a receiving element are arranged in the installation cavity. The transparent plate is connected with a transmitting end lens and a receiving end lens which are used for reflecting infrared light emitted by the transmitting source, a mounting base and a connecting platform are arranged in the mounting cavity, the top of the mounting base is provided with a circumferential face, the bottom of the connecting platform is attached to the circumferential face, a PCB is fixed to the top of the connecting platform, and the transmitting source is fixed to the PCB. And a driving device is arranged between the connecting platform and the mounting base and is used for enabling the connecting platform to move along the circumferential surface so as to realize rapid adjustment of the irradiation angle of the emission source. The utility model has the following advantages and effects: the irradiation angle of the emission source can be conveniently and quickly adjusted so as to ensure the utilization efficiency of infrared light emitted by the emission source.

Description

TECHNICAL FIELD

[0001] The utility model relates to rain sensor technical field, concretely relates to a total reflection rain sensor. BACKGROUND

[0002] The total reflection rain sensor is a type of rain sensor, which is designed based on the principle of total internal reflection. When there is no raindrop on the windshield, the infrared light emitted by the infrared emitter tube will be totally internally reflected by the lens and the windshield, and then be received by the receiver on the other side without loss. When there is a raindrop, the total internal reflection environment of the infrared light is changed, and part of the infrared light will enter the raindrop. As a result, the signal received by the receiver will be lost, and the microcontroller can calculate the amount of rain according to the loss rate of the signal.

[0003] For example, the Chinese patent technology document with the publication number CN218866131U previously applied by our department discloses a novel rain sensor, which includes a transmitting source, a transmitting end lens, a receiving end lens, and a receiving element. The transmitting source is fixedly installed on a PCB. The outer side of the transmitting end lens is provided with a plurality of arc-shaped total reflection mirrors arranged in sequence. The transmitting source is opposite to the position between the innermost arc-shaped total reflection mirror and the transmitting end lens. The outer side of the receiving end lens is provided with an arc-shaped lens, and the outer side of the arc-shaped lens is provided with an arc-shaped lens curve.

[0004] In the above technical solution, by increasing the number of arc-shaped total reflection mirrors and adjusting the irradiation position and irradiation angle of the transmitting source, the utilization efficiency of the infrared sensing light emitted by the transmitting source is improved. The adjustment of the irradiation angle of the transmitting source is mainly realized by the independently stretchable springs arranged around the PCB. The springs are sleeved on the bolts, so that by rotating the corresponding bolts, the irradiation angle can be slightly adjusted by the elastic force of the springs. However, during long-term use, it is found that when adjusting the irradiation angle of the transmitting source, a plurality of bolts need to be rotated, so there is certain inconvenience in the adjustment process. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a total reflection rain sensor, which can quickly adjust the irradiation angle of the transmitting source to ensure the utilization efficiency of the infrared light emitted by the transmitting source.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: a kind of total reflection rainfall sensor, install in glass inner side, the outer surface of glass is used as glass total reflection surface, it is characterized in that, the rainfall sensor includes mutually connected transparent plate and protective shell, installation cavity is formed between the transparent plate and protective shell, transmitting source and receiving element are equipped in the installation cavity, the transparent plate is connected with the transmitting end lens and receiving end lens for reflecting the infrared light line emitted by transmitting source, installation base and connecting platform are equipped in the installation cavity, the top of installation base is equipped with circumferential surface, the bottom of connecting platform is attached with circumferential surface, PCB board is fixed on the top of connecting platform, transmitting source is fixed to PCB board, driving device is equipped between connecting platform and installation base, the driving device is used to make connecting platform move along circumferential surface, to realize the quick adjustment of the irradiation angle of transmitting source.

[0007] The utility model further sets up: the driving device includes worm and worm gear installed in installation base, the worm is engaged with worm gear and can form transmission cooperation between the both, and the both ends of the worm are rotatably connected to the inner wall of connecting platform.

[0008] The utility model further sets up: the top of installation base is equipped with arc-shaped guide hole, the arc-shaped guide hole is path-adapted with circumferential surface, the bottom of connecting platform is equipped with guide rod extending to arc-shaped guide hole, the guide rod can move along the path of arc-shaped guide hole to guide the movement of connecting platform along circumferential surface.

[0009] The utility model further sets up: one end of the worm extends to the outside of protective shell as driving end, and the driving end is fixed with driving knob.

[0010] The utility model further sets up: the protective shell is equipped with through pass-by opening, the pass-by opening is used for worm to pass out to avoid interference to worm.

[0011] Compared with prior art, the utility model has the beneficial effects that:

[0012] Through the driving device, the connecting platform attached to the circumferential surface of installation base can quickly move along the circumferential surface, so as to realize the quick adjustment of the irradiation angle of transmitting source connected to connecting platform, compared with the mode of rotating multiple bolts in prior art to compress the spring corresponding to the bolt, so as to realize the angle adjustment of transmitting source, it can be more fast, and then the irradiation angle of transmitting source can be quickly adjusted, to ensure the utilization efficiency of infrared light emitted by transmitting source. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 The utility model is connected to the assembly drawing;

[0014] Fig. 2 It is the whole structure schematic view of connection between the driving device, the connecting platform and the mounting base in the utility model;

[0015] Fig. 3 It is the side view of connection between the driving device, the connecting platform and the mounting base in the utility model;

[0016] Fig. 4 It is the cross section schematic view of connection between the driving device, the connecting platform and the mounting base in the utility model. DETAILED DESCRIPTION

[0017] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0018] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0019] As Figs. 1 to 4 The utility model discloses a total reflection rainfall sensor, the sensor is installed in the glass inner side, utilizes glass outer surface as total reflection surface to realize rainfall detection. The transparent plate 1 of sensor adopts high light transmittance material (such as acrylic or glass), and its one side is fixedly connected with the protective shell 2 through sealing glue, and forms the installation cavity. The installation cavity is equipped with the emission source 3 (such as infrared LED) and receiving element 4 (such as photodiode), and the emission source 3 is used to emit infrared light to the glass outer surface, and the receiving element 4 is used to receive the light signal after total reflection. The side of transparent plate 1 close to glass is equipped with emission end lens 5 and receiving end lens 6, and emission end lens 5 focuses the infrared light emitted by emission source 3 and vertically incident to the glass outer surface, and receiving end lens 6 focuses the infrared light reflected back to receiving element 4, and ensures the efficient transmission of light path, wherein the emission end lens 5 and receiving end lens 6 in the drawing are only schematic, and they still adopt the existing structure.

[0020] In the embodiment, the mounting cavity is provided with a mounting base 7 and a connecting platform 8, the top of the mounting base 7 is processed into a circumferential surface 71, the bottom of the connecting platform 8 is matched with the circumferential surface 71 through an arc-shaped groove, so that the connecting platform 8 can slide along the circumferential surface 71. The top of the connecting platform 8 is fixed with a PCB 9, and the emission source 3 is welded on the PCB 9. In order to adjust the irradiation angle of the emission source 3, a driving device is arranged between the connecting platform 8 and the mounting base 7, and the driving device comprises a worm 101 and a worm gear 102 fixed to the mounting base 7. The two ends of the worm 101 are rotatably connected to the inner wall of the connecting platform 8 through bearings and are engaged with the worm gear 102. When the worm 101 is rotated, the engagement of the worm 101 and the worm gear 102 drives the connecting platform 8 to move along the circumferential surface 71, so as to accurately adjust the irradiation angle of the emission source 3, and ensure that the infrared light is vertically incident on the outer surface of the glass. Therefore, compared with the prior art, the emission source 3 needs to be rotated, and the corresponding spring of the bolt is compressed, so as to realize the angle adjustment of the emission source 3. The method can be more fast, and the irradiation angle of the emission source 3 can be quickly adjusted to ensure the utilization efficiency of the infrared light emitted by the emission source 3.

[0021] In order to further improve the stability of the angle adjustment of the emission source 3, an arc-shaped guide hole 72 with the same arc as the circumferential surface 71 is formed in the top of the mounting base 7, a guide rod 11 is fixed to the bottom of the connecting platform 8, and the guide rod 11 is inserted into the arc-shaped guide hole 72. When the worm 101 drives the connecting platform 8 to move, the guide rod 11 slides along the arc-shaped guide hole 72 to accurately guide the moving path and avoid angle deviation or shaking. One end of the worm 101 extends to the outside of the protective shell 2 as a driving end 101a, and a driving knob 12 is fixed to the driving end 101a. The protective shell 2 is provided with a gap 21 corresponding to the position where the worm 101 penetrates out, and the size of the gap 21 is designed to be larger than the displacement range of the worm 101, so as to avoid mechanical interference caused by the rotation or movement of the protective shell 2 to the worm 101. By manually rotating the driving knob 12, the irradiation angle of the emission source 3 can be conveniently adjusted, the glass scene with different curvatures or installation angles can be adapted, and the universality and installation flexibility of the sensor are improved.

[0022] The use process of the utility model is as follows:

[0023] When rainwater adheres to the outer surface of the glass, the total reflection condition is destroyed, and the reflected light intensity detected by the receiving element 4 is weakened. By analyzing the rate and amplitude of the light intensity change through the microcontroller on the PCB, the rain amount can be judged and the wiper action can be triggered. And through the driving device arranged, the sensor can quickly adjust the angle of the emission source 3 according to the actual arc of the glass after installation, so as to ensure the detection accuracy; at the same time, the self-locking characteristic of the worm gear 101 transmission can prevent the angle from deviating under the action of vibration or external force, and the long-term stability is enhanced.

[0024] In addition, it should be noted that the technical features involved in the present scheme, such as the emission source 3, the emission end lens 5, the receiving end lens 6, the receiving element 4, the PCB 9, the microcontroller, etc. should be regarded as prior art. The specific structure, working principle and possible control method and spatial arrangement method of these technical features can be selected conventionally in the art, and should not be regarded as the utility model point of the present patent, and therefore will not be further described in detail.

[0025] The specific embodiments are merely an explanation of the present utility model, and are not a limitation of the present utility model. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present utility model, they are protected by the patent law.

Claims

1. A total internal reflection rain sensor, installed on the inner side of glass, with the outer surface of the glass serving as the total internal reflection surface, characterized in that, The rain sensor comprises a transparent plate and a protective shell connected with each other, a mounting cavity is formed between the transparent plate and the protective shell, a transmitting source and a receiving element are arranged in the mounting cavity, the transparent plate is connected with a transmitting end lens and a receiving end lens for reflecting infrared light emitted by the transmitting source, a mounting base and a connecting platform are arranged in the mounting cavity, a circumferential surface is arranged on the top of the mounting base, the bottom of the connecting platform is attached to the circumferential surface, a PCB board is fixed on the top of the connecting platform, the transmitting source is fixed on the PCB board, a driving device is arranged between the connecting platform and the mounting base, and the driving device is used for moving the connecting platform along the circumferential surface to quickly adjust the irradiation angle of the transmitting source.

2. A total-reflecting rain sensor according to claim 1, characterized in that The driving device comprises a worm and a worm gear mounted on the mounting base, the worm is engaged with the worm gear and can form a transmission fit therebetween, and the two ends of the worm are rotatably connected to the inner wall of the connecting platform.

3. A total-reflecting rain sensor according to claim 2, characterized in that An arc-shaped guide hole is arranged on the top of the mounting base, the arc-shaped guide hole is path-adapted to the circumferential surface, a guide rod extending to the arc-shaped guide hole is arranged on the bottom of the connecting platform, and the guide rod can move along the path of the arc-shaped guide hole to guide the movement of the connecting platform along the circumferential surface.

4. A total-reflecting rain sensor according to claim 2 or 3, characterized in that One end of the worm extends to the outside of the protective shell as a driving end, and the driving end is fixed with a driving knob.

5. A total-reflecting rain sensor according to claim 4, characterized in that The protective shell is provided with a through gap, and the worm gear passes out of the gap to avoid interference with the worm gear.

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