Multi-lens optical rainfall sensor assembly

Abstract

The utility model relates to a multi-lens optical rainfall sensor assembly which is installed on the inner side of glass, the outer surface of the glass serves as a glass total reflection surface, the sensor assembly comprises a light-transmitting plate and a protective shell connected to the light-transmitting plate, an installation cavity is formed between the protective shell and the light-transmitting plate, and a receiving end lens is arranged in the center of the inner side of the light-transmitting plate. A plurality of transmitting end lenses arranged around the receiving end lens are arranged on the periphery of the receiving end lens, reflecting surfaces corresponding to the transmitting end lenses are arranged on the receiving end lens, a transmitting terminal and a receiving terminal are arranged below the light-transmitting plate, the transmitting terminal is used for transmitting infrared light to the transmitting end lenses, the infrared light is emitted to the glass after being collimated by the transmitting end lenses, and the receiving terminal is used for receiving the infrared light. And the transmitting terminal and the receiving terminal can move along the circumference so as to receive signals in each sensing area. The utility model has the following advantages and effects: the coverage rate of the sensing area can be improved, so as to improve the sensing accuracy and reduce the response time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rain sensor, concretely relates to a multi-lens optical rain sensor assembly. BACKGROUND

[0002] The optical rain sensor is also called a total reflection rain sensor, which is designed by using the total internal reflection principle. By taking an infrared LED as a signal light source, the LED emits an infrared signal light which is collimated and obliquely incident into the front windshield glass of a vehicle by a transmitting lens. When the obliquely incident signal light meets the angle requirement of the total reflection of the glass, the signal light is reflected to the receiving lens, and is focused on the receiving element by the receiving lens. When there are raindrops on the upper surface of the windshield glass, the total internal reflection environment of the infrared light is changed, and part of the infrared light enters the raindrops, so that the signal received by the receiver is lost, and thus the microcontroller can calculate the size of the rainfall according to the loss rate of the signal.

[0003] For example, the Chinese patent technical document with the publication number CN212569180U previously applied by the applicant discloses a light path structure of a rain sensor, the outer surface of the glass is provided as a glass total reflection surface, the light path structure comprises a transmitting source, a transmitting lens, a plurality of double total reflection surface lenses, a receiving lens, and a receiving element, the double total reflection surface lenses are sequentially arranged, the transmitting source emits infrared signal light and directs it to the transmitting lens, the infrared signal light forms parallel light directed to the glass total reflection surface in the transmitting lens, the parallel light passes through a plurality of light path units in sequence and then is totally reflected by the glass total reflection surface to finally enter the receiving lens, and is gathered in the receiving lens to form a receiving signal, and the receiving element receives the signal.

[0004] The light path structure of the rain sensor of the utility model increases the number of total reflection areas inside the glass by using the double total reflection surface lenses, thereby increasing the number and total area of the sensing areas. Under the same sensing parameter conditions, the element cost can be saved.

[0005] However, it is found in the actual use that there is a large gap between the adjacent sensing areas, so that the coverage rate of the sensing areas is low, which affects the accuracy of sensing and the response time. SUMMARY

[0006] In view of the deficiencies in the prior art, the utility model aims to provide a multi-lens optical rain sensor assembly which can improve the coverage rate of the sensing areas to improve the accuracy of sensing and reduce the response time.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a kind of multi-lens optical rain sensor assembly, it is installed in the inside of glass, the outer surface of glass is used as glass total reflection surface, the sensor assembly includes light-transmitting plate and the protective shell connected to light-transmitting plate, installation cavity is formed between the protective shell and light-transmitting plate, the inside center of light-transmitting plate is equipped with receiving end lens, the periphery of receiving end lens is equipped with a plurality of sending end lens around receiving end lens, the receiving end lens is equipped with the reflection surface corresponding to each sending end lens, the lower side of light-transmitting plate is equipped with sending terminal and receiving terminal, the sending terminal is used to emit infrared light to sending end lens, it is shot to glass after collimation by sending end lens, to form sensing area on glass total reflection surface, the sending terminal and receiving terminal can move along circumference to receive the signal in each sensing area.

[0008] The utility model further provides: the installation cavity is equipped with the baffle that is integrally arranged with the protective shell, the baffle is equipped with the connecting port that is penetrated, the connecting port is equipped with rotatable connecting disc, the sending terminal and receiving terminal are fixed to connecting disc, the bottom of connecting disc is equipped with micro motor, and the micro motor is used to drive connecting disc rotation.

[0009] The utility model further provides: the connecting port peripheral wall is fixed with annular guide rail, the periphery of connecting disc is rotatably connected with pulley, the pulley is coupled to annular guide rail, and can form rolling fit between the both.

[0010] The utility model further provides: the bottom of protective shell is fixed with installation groove, the slot of installation groove is equipped with detachable cover plate, and the micro motor is installed in installation groove.

[0011] The utility model further provides: the periphery of cover plate is equipped with the first threaded hole that is penetrated, and the bottom of protective shell is equipped with the second threaded hole opposite to the first threaded hole.

[0012] Compared with prior art, the utility model has the advantages of:

[0013] Since a plurality of sending end lenses are arranged around the periphery of the receiving end lens, and the receiving end lens is provided with a reflection surface corresponding to each sending end lens, after the sending terminal sends infrared light to the sending end lens, the infrared light is shot to the glass after collimation by the sending end lens to form a sensing area on the glass total reflection surface, and then the infrared light is shot to the receiving terminal by the receiving end lens after being totally reflected by the glass, so that a plurality of sending end lenses and reflection surfaces are arranged to form a plurality of sensing areas uniformly distributed around the periphery, thereby effectively increasing the area of the sensing area, improving the coverage rate of the sensing area, and the sending terminal and the receiving terminal can move around the periphery to receive signals in each sensing area, thereby improving the accuracy of sensing. Attached Figure Description

[0014] Fig. 1 This is an overall exploded view of the present invention;

[0015] Fig. 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0016] Fig. 3 This is a schematic diagram of partial relationships in this utility model;

[0017] Fig. 4 This is a schematic diagram of the local optical path of this utility model. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] like Figs. 1 to 4The utility model discloses a kind of multi-lens optical rain amount sensor components, the sensor component is installed in glass inner side, utilize glass outer surface as total reflection surface 41 to realize rain amount detection.The sensor component includes light-transmitting plate 1 and the protective shell 2 connected to light-transmitting plate 1, the light-transmitting plate 1 of sensor uses high light transmittance material (such as acrylic or glass), its side is fixedly connected with protective shell 2 by sealing glue, forms mounting cavity 3.Light-transmitting plate 1 inner side center position is equipped with receiving end lens 4, receiving end lens 4 periphery surrounds multiple sending end lens 5, receiving end lens 4 is equipped with corresponding reflection surface 41 with each sending end lens 5, and the lower side of light-transmitting plate 1 is equipped with sending terminal 6 and receiving terminal 7 installed in mounting cavity 3.Sending terminal 6 is used to emit infrared light to sending end lens 5, and the infrared light sent is collimated after sending end lens 5 and is shot to glass, to form sensing area 100 in glass total reflection surface 41, then after total reflection to glass, corresponding reflection surface 41 with the sending terminal 5, by receiving end lens 4, it is shot to receiving terminal 7, so through the setting of multiple sending end lens 5 and reflection surface 41, the sensing area 100 that can form is evenly distributed according to circumference, to effectively increase the area of sensing area 100, improve the coverage of sensing area 100, and sending terminal 6 and receiving terminal 7 can move along circumference, to receive the signal in each sensing area 100, cover different sensing area 100, so it can improve the accuracy of sensing.

[0021] Among them, the structure that sending terminal 6 and receiving terminal 7 can move along circumference is that, the connecting port of circularity is equipped on the baffle 8 in mounting cavity 3, and the connecting disc 9 that can rotate around connecting port axis is equipped in connecting port.The bottom center of connecting disc 9 is fixed with micro motor 10, and the output shaft of micro motor 10 is coaxially connected with connecting disc 9, drives sending terminal 6 and receiving terminal 7 to rotate synchronously.Specifically, when micro motor 10 uses step motor, corresponding pulse signal is sent to step motor by the hardware timer or software delay function timing built in microcontroller, and step motor can rotate a certain angle according to the number of step distance angle and pulse signal, so it can drive sending terminal 6 and receiving terminal 7 to rotate intermittently, so it can ensure that there is sufficient stagnation time for sending terminal 6 and receiving terminal 7 to receive and send signal.For example, micro motor 10 is paused every 60 ° rotation, so that sending terminal 6 and receiving terminal 7 are aligned with the next group of lenses, and each sensing area 100 is scanned in turn.Receiving terminal 7 converts light intensity signal into electric signal, and transmits to microcontroller after filtering and amplification, and judges rain amount grade through threshold comparison.

[0022] In addition, in order to improve the rotation stability, the connecting port peripheral wall is provided with an annular guide rail 11, and the outer edge of the connecting disc 9 is provided with a plurality of nylon pulleys 12 with ball bearings. The pulleys 12 are in rolling fit with the annular guide rail 11, so as to reduce the friction and prevent the yaw when the connecting disc 9 rotates. In addition, the bottom of the protective shell 2 is provided with a mounting groove 13, and the micro motor 10 is packaged in the mounting groove 13. The opening of the mounting groove 13 is provided with a detachable cover plate 14. A plurality of first threaded holes 141 are formed around the cover plate 14, corresponding to the second threaded holes formed in the bottom of the protective shell 2, and can be fixed by screws. In this way, the micro motor 10 can be easily disassembled, maintained or replaced.

[0023] In addition, it should be noted that the technical features related to the sending terminal 6, the transmitting end lens, the receiving end lens 4, the receiving terminal 7, the microcontroller and the micro motor 10 in the present scheme should be regarded as prior art. The specific structure, working principle and possible control mode and spatial arrangement mode of these technical features can be selected by using conventional methods in the art, and should not be regarded as the utility model point of the present utility model patent. Therefore, they will not be further described in detail.

[0024] The specific embodiment is only an explanation of the present utility model, and is not a limitation of the present utility model. Those skilled in the art can make modifications to the present embodiment without creative contribution after reading the present specification. However, 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 multi-lens optical rain sensor assembly installed on the inner side of a glass whose outer surface serves as a glass total reflection surface, characterized by, The sensor assembly comprises a light-transmitting plate and a protective shell connected to the light-transmitting plate, a mounting cavity is formed between the protective shell and the light-transmitting plate, a receiving end lens is arranged at the center of the inner side of the light-transmitting plate, a plurality of sending end lenses are arranged around the receiving end lens, a reflecting surface corresponding to each sending end lens is arranged on the receiving end lens, a sending end and a receiving end are arranged below the light-transmitting plate, the sending end is used for emitting infrared light to the sending end lens, the infrared light is collimated by the sending end lens and then is emitted to the glass, so as to form a sensing area on the total reflection surface of the glass, and the sending end and the receiving end can move along the circumference to receive signals in each sensing area.

2. A multi-lens optical rain rate sensor assembly according to claim 1, wherein, A partition plate is arranged in the mounting cavity and is integrally arranged with the protective shell, the partition plate is provided with a through connecting port, a rotatable connecting disc is arranged in the connecting port, the sending end and the receiving end are fixed to the connecting disc, a micro motor is arranged at the bottom of the connecting disc, and the micro motor is used for driving the connecting disc to rotate.

3. A multi-lens optical rain rate sensor assembly according to claim 2, wherein, An annular guide rail is fixed to the connecting port, a pulley is rotatably connected to the outer periphery of the connecting disc, the pulley is coupled to the annular guide rail and can form a rolling fit therebetween.

4. A multi-lens optical rain rate sensor assembly according to claim 2, wherein, An installation groove is fixed to the bottom of the protective shell, a detachable cover plate is arranged at the groove opening of the installation groove, and the micro motor is arranged in the installation groove.

5. A multi-lens optical rain rate sensor assembly according to claim 4, wherein, A first threaded hole is arranged at the periphery of the cover plate, and a second threaded hole is arranged at the bottom of the protective shell and is opposite to the first threaded hole.

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