CN117135422A

CN117135422A - A clean system and module of making a video recording for making a video recording module

Info

Publication number: CN117135422A
Application number: CN202311015478.7A
Authority: CN
Inventors: 唐新科; 刘银坤; 解伟
Original assignee: Zhejiang Sunyu Zhiling Technology Co ltd
Current assignee: Zhejiang Sunyu Zhiling Technology Co ltd
Priority date: 2023-08-14
Filing date: 2023-08-14
Publication date: 2023-11-28

Abstract

The application provides a cleaning system for a camera module and the camera module, wherein the camera module comprises a camera, an outer lens, a transducer and a driving part; the driving part outputs a pulse module which at least comprises a first pulse group unit and a second pulse group unit; in the cleaning process, judging the type of the stain in advance, and cleaning according to a cleaning mode corresponding to the type of the stain; the method comprises the steps of presetting a first cleaning mode corresponding to a first stain type, entering a first vibration stage, outputting N1 pulse modules by a driving part to drive a transducer to vibrate, judging the cleanliness of an outer lens, entering the first vibration stage again if the cleanliness is higher than a cleanliness threshold, and ending cleaning if the cleanliness is not higher than the cleanliness threshold. Accordingly, it is possible to provide a cleaning system for an image pickup module that performs cleaning in a cleaning mode corresponding to a stain type.

Description

A clean system and module of making a video recording for making a video recording module

Technical Field

The present application relates to a cleaning system for an image pickup module and an image pickup module capable of cleaning in a cleaning mode corresponding to a stain type.

Background

In reality, the use scene of the camera module is wider and wider, taking the vehicle-mounted camera module as an example, the camera module is inevitably covered by various stains, frost fog at low temperature and the like due to changeable external environment, and the imaging quality is reduced.

Currently, there are schemes of vibration decontamination using ultrasonic technology, which remove the dirt attached to the lens of the camera module by vibration of a specific frequency and realize automatic cleaning. However, different stain types such as muddy water, liquid, dust, thin ice and the like have different required vibration frequencies and vibration durations, and some stains such as frost also need to be assisted by heating, and the simple ultrasonic vibration has low decontamination efficiency and less ideal effect.

Accordingly, in the related art, there is a technical problem that cleaning is performed in a cleaning mode corresponding to a stain type to improve cleaning efficiency.

Disclosure of Invention

The application aims to provide a cleaning system for an image pickup module, which can perform cleaning in a cleaning mode corresponding to a stain type. In order to achieve the above object, according to one aspect of the present application, a cleaning system for an image capturing module includes a camera and an outer lens as a cleaning object, the outer lens being located at a side of the camera facing a subject; the cleaning system comprises a transducer which is in butt joint with the outer lens and is connected with a driving part, and the transducer can drive the outer lens to vibrate under the driving of an electric signal output by the driving part so as to remove stains attached to the outer lens; the electric signal output by the driving part comprises a pulse module, and the pulse module at least comprises a first pulse group unit and a second pulse group unit; in the cleaning process, judging the type of the stains attached to the outer lens in advance, and cleaning the outer lens according to a cleaning mode corresponding to the type of the stains by the cleaning system; the method comprises the following steps of presetting a first cleaning mode corresponding to a first stain type, and cleaning according to the following steps: entering a first vibration stage, wherein the driving part outputs N1 pulse modules to drive the transducer to vibrate, the process is used as a first cleaning period, and N1 is an integer greater than/equal to 1; after the first cleaning period is finished, judging whether the cleanliness of the outer lens is higher than a preset cleanliness threshold; and if the cleanliness is higher than the cleanliness threshold value, re-entering the first cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

According to the technical scheme, a first cleaning mode is set for the first stain type, and the transducer is driven to vibrate and decontaminate through the plurality of pulse modules.

In a preferred embodiment, the driving unit may further output a third pulse group unit which lasts for a predetermined time and has a constant frequency; presetting a second cleaning mode corresponding to a second stain type, and performing cleaning operation according to the following steps: sequentially entering a second vibration stage, a first heating stage and a third vibration stage, wherein the process is used as a second cleaning period; wherein, in the second vibration stage, the driving part outputs N2 pulse modules to drive the transducer to vibrate, and N2 is an integer greater than/equal to 1; in the first heating stage, the driving part outputs M1 third pulse group units, drives the outer lens to vibrate and generate heat through the transducer, and M1 is an integer greater than/equal to 1; in the third vibration stage, the driving part outputs N3 pulse modules to drive the transducer to vibrate, wherein N3 is an integer greater than/equal to 1; after the second cleaning period is finished, judging whether the cleanliness of the outer lens is higher than the cleanliness threshold; and if the cleanliness is higher than the cleanliness threshold value, re-entering the second cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

According to the technical scheme, the second cleaning mode is set for the second stain type, and the effects of heating, drying and vibration decontamination are achieved through the arrangement and combination of the pulse modules and the third pulse units.

In a preferred manner, N2 > N1.

According to the aforementioned solution, the second stain type is more adhesive than the first stain type, and therefore requires more pulse modules for vibration decontamination.

In a preferred manner, a third cleaning mode corresponding to a third stain type is preset, and the cleaning operation is performed according to the following steps: sequentially entering a second heating stage and a fourth vibration stage, and taking the process as a third cleaning period; wherein, in the second heating stage, the driving part outputs M2 third pulse group units, drives the outer lens to vibrate and generate heat through the transducer, and M2 is an integer greater than/equal to 1; in the fourth vibration stage, the driving part outputs N4 pulse modules to drive the transducer to vibrate, and N4 is an integer greater than/equal to 1; after the third cleaning period is finished, judging whether the cleanliness of the outer lens is higher than the cleanliness threshold; and if the cleanliness is higher than the cleanliness threshold value, re-entering the second cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

According to the technical scheme, the third cleaning mode is set for the third stain type, and the effects of heating, melting, vibrating and decontaminating the stains such as frost are achieved through the modes of heating firstly and vibrating later.

In a preferred manner, a fourth cleaning mode corresponding to a fourth stain type is preset, and the cleaning operation is performed according to the following steps: sequentially entering a third heating stage and a fifth vibration stage, and taking the process as a fourth cleaning period; wherein, in the third heating stage, the driving part outputs M3 third pulse group units, drives the outer lens to vibrate and generate heat through the transducer, and M3 is an integer greater than/equal to 1; in the fifth vibration stage, the driving part outputs N5 pulse modules to drive the transducer to vibrate, N5 is an integer greater than/equal to 1, and after the fourth cleaning period is finished, whether the cleanliness of the outer lens is higher than the cleanliness threshold value is judged; and if the cleanliness is higher than the cleanliness threshold value, re-entering the second cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

According to the technical scheme, the fourth cleaning mode is set for the fourth stain type, and the effects of heating, drying and vibrating decontamination are achieved on stains such as dust and mist mixture in a heating and vibrating mode.

In a preferred manner, N4 > N5.

According to the aforementioned solution, the fourth stain type is more adhesive than the third stain type, so that more pulse modules are required for vibration decontamination.

In a preferred mode, the first pulse group unit includes a first pulse group and a second pulse group, and the second pulse group unit includes a third pulse group and a fourth pulse group; the frequency of the pulses in the third pulse group and the fourth pulse group is far away from the natural frequency of the outer lens relative to the frequency of the pulses in the first pulse group and the second pulse group.

According to the technical scheme, the blind spots of single frequency vibration can be eliminated by adopting different frequency ranges, and the comprehensive decontamination effect of the external lens is realized.

In a preferred mode, the first pulse group unit includes a first pulse group and a second pulse group, and the second pulse group unit includes a third pulse group and a fourth pulse group; the frequency of the pulse of any one of the first pulse group, the second pulse group, the third pulse group and the fourth pulse group is gradually increased.

In a preferred form, the transducer is disposed on a side of the outer lens adjacent the camera, the transducer being annular in shape around the optical axis of the camera in the assembled state.

In a preferred embodiment, the transducer vibrates to form a standing wave in the outer lens when driven by the driving section.

According to the technical scheme, the transducer vibrates on the outer lens to form standing waves, so that the vibration can be overlapped, and a better decontamination effect is achieved.

In addition, another aspect of the present application is an imaging module including a camera and an outer lens located on a side of the camera facing a subject; the method is characterized in that: the cleaning system for the camera module is further provided.

According to the technical scheme, the camera module can be efficiently cleaned by adopting the cleaning mode corresponding to the stain type.

Drawings

In order to more clearly illustrate the present application, the following description and the accompanying drawings of the present application will be given. It should be apparent that the figures in the following description merely illustrate certain aspects of some exemplary embodiments of the present application, and that other figures may be obtained from these figures by one of ordinary skill in the art without undue effort.

Fig. 1 is a schematic view of an exemplary camera module structure.

Fig. 2 is a schematic pulse diagram of an exemplary mud removal mode.

Fig. 3 is a schematic diagram illustrating standing wave vibrations at different frequencies.

Fig. 4 is a pulse schematic diagram of an exemplary deicing mode.

Fig. 5 is an exemplary cleaning mode control flow chart.

Description of the drawings:

1 camera

2 outer lens

21 gasket

3 transducer

4 pulse module

41 first pulse group unit

411 first pulse group

412 second pulse group

42 second pulse group unit

423 third pulse group

424 fourth pulse group

43 third pulse group unit

Detailed Description

Various exemplary embodiments of the present application are described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the application, its application, or uses. The present application may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, numerical expressions and values, etc. set forth in these embodiments are to be construed as illustrative only and not as limiting unless otherwise stated.

As used herein, the word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Parameters of, and interrelationships between, components, and control circuitry for, components, specific models of components, etc., which are not described in detail in this section, can be considered as techniques, methods, and apparatus known to one of ordinary skill in the relevant art, but are considered as part of the specification where appropriate.

Camera module

The configuration of the imaging module according to the present application is described below with reference to fig. 1. Fig. 1 is a schematic view of a camera module.

Referring to fig. 1, the camera module includes a camera 1 and an outer lens 2 as a cleaning object, wherein the outer lens 2 is located at a side of the camera 1 facing a subject. For convenience of explanation, the direction of the camera 1 toward the subject is the front, the direction away from the subject is the rear, and the description of the direction is the same as that described below unless otherwise specified.

The rear side of the camera 1 is provided with an image sensor 12 perpendicular to the optical axis of the camera 1 and a wiring board 13 electrically connected to the image sensor 12. The image sensor 12 is used for converting the optical signals collected by the camera 1 into electrical signals and sending the electrical signals to the circuit board 13.

In a general example, the camera 1, the image sensor 12, and the wiring board 13 are provided in the housing 11 of the camera module. The shape of the housing 11 is not particularly limited, and the housing 11 is exemplified by a tubular form penetrating front and rear.

For example, the outer lens 2 is fixed to the front end of the housing 11 via a spacer 21. The outer lens 21 may be bonded or welded to the rear end surface of the spacer 21, and then the rear end surface of the spacer 21 may be bonded or welded to the front end surface of the housing 11. The outer lens 2 is mainly used for protecting the camera 1 and preventing the camera 1 from being stained or damaged. The outer lens 2 is made of a light-transmitting material, so that the influence on the light collected by the camera 1 is reduced.

Because the application scene of the camera module is wider, taking a vehicle-mounted scene as an example, the camera module is inevitably covered by various stains due to changeable external environment, and the imaging quality is reduced so as to influence the driving safety. In general, the front end surface of the outer lens 2 is attached with various stains including mud, liquid, dust, ice, frost mist, and the like.

For this purpose, a cleaning system of the camera module is provided, and the cleaning system includes a transducer 3 that is abutted against the outer lens 2 and is connected with a driving portion (not shown in the figure), and the transducer 3 can drive the outer lens 2 to vibrate under the driving of an electric signal output by the driving portion, so as to remove stains attached to the outer lens 2.

Illustratively, the transducer 3 is a piezoelectric transducer, and can convert electric energy into mechanical energy, and transmit the mechanical energy to the outer lens 2, so as to cause vibration of the outer surface of the outer lens 2, repeatedly impact the stain layer, and finally break the stain layer and peel the stain layer from the outer lens 2, thereby achieving a cleaning effect. It should be noted that the frequencies of the cleaning modes of the application are all over 20khz, and the application belongs to the ultrasonic frequency band, namely, the application removes the dirt in an ultrasonic vibration mode.

Preferably, the transducer 3 is ring-shaped around the optical axis of the camera 1, is adhered to the rear side of the outer lens 2, and is connected to the wiring board 13 through a transmission line 31 of power and signals. The transducer 3 is fitted to the inner wall of the housing 11. Wherein, the components of the outer lens 2, the transducer 3, the gasket 21 and the like jointly form a lens cover assembly of the camera module.

In addition, the cleaning system of the present application further comprises an ultrasonic PWM drive (not shown) provided on the circuit board 13, which provides corresponding cleaning modes for different types of stains according to a preset built-in program, and outputs corresponding PWM waveforms to the driving part. In the present embodiment, the driving section is a piezoelectric driver provided on the wiring board 13. The cleaning system further comprises a power module for powering the ultrasonic PWM drive and drive section.

The driving part receives PWM signals output by ultrasonic PWM driving, converts direct current provided by the power supply module into alternating current and outputs the alternating current to the transducer 3, and the transducer 3 converts alternating current with different frequencies into oscillation mechanical energy with different frequencies so as to be conducted to the surface of the outer lens 2 for decontamination.

As an example, the power module of the cleaning system is transported through a separate power connector; the signals and the electric energy of the camera 1 are transmitted in a POC manner through the FAKRA connector to an external control system, such as an onboard ECU, which is not described in detail herein.

In addition, still be provided with feedback module, can real-time supervision outer lens 2 and transducer 3's temperature, vibration frequency, voltage, electric current etc to with signal feedback to ultrasonic wave PWM drive, ultrasonic wave PWM drive is in time adjusted the vibration frequency of the ultrasonic wave of output according to feedback module's feedback signal, in order to ensure that the circuit operation is stable controllable, and reaches better clean effect.

Pulse module

The pulse module 4 is described in detail below with reference to fig. 2. Fig. 2 is a schematic pulse diagram of the mud removal mode.

Referring to fig. 2, the electric signal output by the driving unit includes a pulse module 4, and the pulse module 4 includes at least a first pulse group unit 41 and a second pulse group unit 42. Preferably, the first pulse group unit 41 includes a first pulse group 411 and a second pulse group 412, and the second pulse group unit 42 includes a third pulse group 423 and a fourth pulse group 424.

Wherein the frequency of the pulses in the third pulse group 423 and the fourth pulse group 424 is far away from the natural frequency of the outer lens 2 relative to the frequency of the pulses in the first pulse group 411 and the second pulse group 412. The natural frequency is the natural resonant frequency of the outer lens 2, the frequency depends on the molecular structure and the geometric shape of the object, and if energy is applied to the outer lens 2 at the natural frequency, the outer lens 2 can generate vibration with maximum acceleration, so that better dirt removing effect is achieved. The natural frequency here is actually the natural frequency of the lens cover assembly including the outer lens 2, but for simplicity, the present application will be described by taking the natural frequency of the outer lens 2 as an example.

Further, the frequency of the pulses in the first pulse group 411, the second pulse group 412, the third pulse group 423, and the fourth pulse group 424 is gradually increased. Illustratively, assuming the natural frequency of the outer lens 2 is 120KHz, the first pulse set 411 has a duration of 100ms, comprising a plurality of pulses that are stepped up from a frequency of 115KHz-120KHz, with a time interval between adjacent pulses of 250 μs. The second pulse set 412 has a duration of 100ms and comprises a plurality of pulses that are stepped up from a frequency of 120KHz to 125KHz with a time interval between adjacent pulses of 250 mus. The third pulse group 423 has a duration of 100ms and comprises a plurality of pulses that are stepped up from a frequency of 140KHz to 145KHz with a time interval between adjacent pulses of 250 mus. The fourth pulse group 424 has a duration of 100ms and comprises a plurality of pulses that are stepped up from a frequency of 145KHz to 150KHz with a time interval of 250 mus between adjacent pulses. Preferably, the first pulse group 411, the second pulse group 412, the third pulse group 423, and the fourth pulse group 424 are spaced 250 milliseconds apart from each other.

In practice, the duration, frequency range, interval time between adjacent pulses, and interval time between adjacent pulse groups of the first pulse group 411, the second pulse group 412, the third pulse group 423, and the fourth pulse group 424 are not limited to the above data, and are specifically determined according to practical requirements, and are merely illustrative and not specifically limited.

It will be appreciated that the pulse module 4 is made up of a plurality of pulse groups of different frequencies. It should be noted that, in addition to the above-mentioned two pulse groups each including 2 pulse groups, the first pulse group unit 41 and the second pulse group unit 42 may also include 1 or more pulse groups, and when 1 pulse group is respectively provided, the duration of each pulse group may be prolonged appropriately to enhance the vibration decontamination effect. When more pulse groups are set up, the duration of each pulse group can be appropriately shortened. However, in setting the frequency ranges of the pulse groups, it is preferable to cover the frequency ranges of the pulses in the pulse groups in the first pulse group unit 41 to the natural frequency of the outer lens 2 and to make the frequency ranges of the pulses in the pulse groups in the second pulse unit 42 different from the frequency ranges of the pulses in the pulse groups in the first pulse unit 41, which will be described in detail later.

For simplicity, only the first pulse group unit 41 includes the first pulse group 411 and the second pulse group 412, and the second pulse group unit 42 includes the third pulse group 423 and the fourth pulse group 424.

In the use process of the camera module, the natural frequency of the outer lens 2 can slightly change due to the fact that different stains are attached, for example, if the natural frequency of the outer lens 2 is 120kHz when no stains are attached, the natural frequency of the outer lens 2 can float up and down when no stains are attached, so that the frequency ranges of the pulses in the first pulse group 411 and the second pulse group 412 are set up in a floating manner along 120kHz, the frequency of the pulses can also cover the natural frequency when the stains are attached to the outer lens 2, the vibration effect of the outer lens 2 is enhanced, and a better dirt removing function is achieved.

In addition, as a preferable mode, the application adopts the form of standing wave to carry out vibration decontamination on the outer lens 2, wherein the standing wave is a wave formed when two rows of waves which are propagated in opposite directions and have the same amplitude and the same frequency are overlapped.

Specifically, in the assembled state, the transducers 3 are annular around the optical axis of the camera 1, or an even number of transducers 3 are symmetrically disposed around the optical axis of the camera 1 in the circumferential direction, in order to form a standing wave in the outer lens 2 via vibration of the transducers 3, to increase the acceleration of vibration of the outer lens 2, and to improve the decontamination effect.

It will be appreciated that at the antinode of the standing wave, the voltages or currents of the two rows of waves propagating in opposite directions add up, maximizing the vibration acceleration at the antinode, and providing a better decontamination effect. However, at the nodes of the standing wave, the voltages or currents of the two rows of waves propagating in opposite directions are subtracted, so that the vibration acceleration at the nodes is minimized or even zero, the decontamination effect is poor, and the positions at the nodes are taken as blind spots of the standing wave.

In order to overcome the problem of poor blind spot decontamination effect, an A standing wave close to the natural frequency of the outer lens 2 is adopted for vibration decontamination, and a B standing wave with another different frequency is arranged, and after the A standing wave is vibrated for decontamination, the B standing wave is transmitted to the outer lens 2. Because the frequency of the B standing wave is far away from the natural frequency of the outer lens 2 relative to the frequency of the a standing wave, the vibration acceleration generated by the B standing wave on the outer lens 2 is relatively smaller, but the B standing wave can make the outer lens 2 vibrate at the blind spot of the a standing wave so as to achieve the effect of full-coverage decontamination.

Referring specifically to fig. 3, fig. 3 is a schematic diagram of standing wave vibrations at different frequencies. In the figure, the abscissa represents the distance from the vibration center, that is, the center of the outer lens 2, and the ordinate represents the normalized vibration acceleration value. From the figure, the B standing wave generates vibration acceleration at the blind spot of the A standing wave, and the problem of poor vibration decontamination effect at the blind spot of the A standing wave is solved.

In view of the above, the present application sets the pulse groups in the first pulse group unit 41 in a manner close to the natural frequency of the outer lens 2, and sets the pulse groups in the second pulse group unit 42 in a manner different from the frequency of the pulse groups in the first pulse group unit 41.

Cleaning mode

Next, the cleaning mode will be described with reference to fig. 2, 4, and 5. Fig. 4 is a pulse schematic diagram of the deicing mode, and fig. 5 is a cleaning mode control flow chart.

Referring to fig. 5, in the cleaning process, the camera 1 firstly collects the image information of the outer lens 2, then judges whether the outer surface of the outer lens 2 is attached with the stain according to a preset algorithm, if the stain exists, further judges the type of the stain, and the cleaning system cleans according to a cleaning mode corresponding to the type of the stain.

In this embodiment, the first stain type is liquid, and the first cleaning mode is a liquid removal cleaning mode, and cleaning is performed according to the following steps: first, the first vibration stage is entered, the driving part outputs N1 pulse modules 4 to drive the transducer 3 to vibrate, and the process is used as a first cleaning period, and N1 is an integer greater than/equal to 1.

After the first cleaning period is finished, judging whether the cleanliness of the outer lens 2 is higher than a preset cleanliness threshold according to a preset algorithm and the image information of the outer lens 2. And if the cleanliness is higher than the cleanliness threshold value, re-entering the first cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

Taking the first stain type as water as an example, as the adhesive force of the water is smaller, the difficulty of water removal is smaller compared with that of mud removal and deicing, and the water removal effect can be achieved only by driving the transducer 3 to vibrate circularly for N1 times through the N1 pulse modules 4. Illustratively, N1 is equal to 1 or 2, i.e. the transducer 3 is driven to vibrate cyclically 1-2 times via the pulse module 4.

Referring to fig. 2, a second cleaning mode corresponding to a second soil type is preset, and in this embodiment, the second soil type is a mud obtained by mixing water and soil, and the second cleaning mode is a mud removing mode.

The driving unit may output the third pulse group unit 43 which lasts for a predetermined time and has a constant frequency. Illustratively, the third pulse group unit 43 lasts 10 seconds, contains a plurality of pulses of the same frequency, and is spaced 250 μs apart between adjacent pulses.

The duration of the third pulse unit 43 and the interval between the internal pulses are not particularly limited as required. In addition, the third pulse unit 43 may include only one long pulse having a constant frequency for a predetermined time as shown in fig. 2, or may include 2 or more long pulses, depending on the use requirement, and for simplicity, only one long pulse is included in the third pulse unit 43.

The second cleaning mode performs cleaning operations as follows: sequentially entering a second vibration stage, a first heating stage and a third vibration stage, wherein the process is used as a second cleaning period;

in the second vibration stage, the driving part outputs N2 pulse modules 4 to drive the transducer 3 to vibrate, wherein N2 is an integer greater than/equal to 1; in the first heating stage, the driving part outputs M1 third pulse group units 43, drives the outer lens 2 to vibrate and generate heat through the transducer 3, and M1 is an integer greater than/equal to 1; in the third vibration stage, the driving part outputs N3 pulse modules 4 to drive the transducer 3 to vibrate, wherein N3 is an integer greater than/equal to 1;

after the second cleaning period is finished, judging whether the cleanliness of the outer lens 2 is higher than a cleanliness threshold value according to a preset algorithm and the image information of the outer lens 2; if the cleanliness is higher than the cleanliness threshold value, the second cleaning period is re-entered, otherwise, the driving part stops outputting the electric signal, and the cleaning process is ended.

The mud has strong adhesive force due to the mixing of water and soil, certain viscosity and dampness. Thus, in this cleaning mode, in the second vibration phase, the transducer 3 is driven to vibrate cyclically N2 times with N2 pulse modules 4 first, loosening the mud attached to the outer lens 2. Illustratively, N2 is equal to 2 or 3, such as shown in fig. 2, and the transducer 3 is driven to vibrate cyclically 2 times with 2 pulse modules 4.

Then, in the first heating stage, M1 third pulse group units 43 drive the outer lens 2 to vibrate through the transducer 3 and generate heat, so that the moisture in the mud is evaporated, and the mud is dried and loosened.

Finally, in the third vibration stage, the transducer 3 is driven to circularly vibrate for N3 times by using N3 pulse modules 4, and after the mud becomes dry and loose, the mud is more easy to vibrate and fall off. Illustratively, as shown in FIG. 2, N3 is equal to 4, i.e., the transducer is cycled 4 times until the soil is shed. In practice the value of N3 depends on the requirements.

Preferably, N2 > N1. I.e. the number of times the transducer 3 is driven to vibrate cyclically during water removal is less than the number of times the transducer 3 vibrates cyclically during the second vibration phase of the mud removal, which is advantageous for saving energy because the adhesion of the water is less.

Referring to fig. 4, a third cleaning mode corresponding to a third stain type is preset. In this embodiment, the third stain type is ice and the third cleaning mode is deicing mode.

The third cleaning mode performs cleaning operations according to the following steps: sequentially entering a second heating stage and a fourth vibration stage, and taking the process as a third cleaning period;

wherein, in the second heating stage, the driving part outputs M2 third pulse group units 43, drives the outer lens 2 to vibrate and generate heat through the transducer 3, and M2 is an integer greater than/equal to 1; in the fourth vibration stage, the driving section outputs N4 pulse modules 4 to drive the transducer 3 to vibrate, N4 being an integer greater than/equal to 1.

After the third cleaning period is finished, judging whether the cleanliness of the outer lens 2 is higher than a cleanliness threshold value according to a preset algorithm and the image information of the outer lens 2; if the cleanliness is higher than the cleanliness threshold value, the second cleaning period is re-entered, otherwise, the driving part stops outputting the electric signal, and the cleaning process is ended.

In the deicing mode, M2 third pulse group units 43 are used in the second heating stage to drive the outer lens 2 to vibrate and generate heat through the transducer 3, so that the ice layer is primarily melted. And then, in the fourth vibration stage, the transducer 3 is driven by the N4 pulse modules 4 to circularly vibrate for N4 times, so that the melted ice layer is broken and falls off, and water drops generated by melting are removed by vibration.

As shown in fig. 4, M2 is equal to 2 and N4 is equal to 4, i.e. the transducer 3 is cyclically vibrated 4 times by heating and melting the ice layer with two long pulses and then by using 4 pulse modules 4, for example. In practice, the values of M2 and N4 are as desired and are not specifically defined herein.

In addition, a fourth cleaning mode corresponding to a fourth stain type is preset, and in this embodiment, the fourth stain type is dust mixed with mist, and the fourth cleaning mode is a dust removal/mist mode.

The fourth cleaning mode performs cleaning operations according to the following steps: sequentially entering a third heating stage and a fifth vibration stage, and taking the process as a fourth cleaning period;

in the third heating stage, the driving part outputs M3 third pulse group units 43, drives the outer lens 2 to vibrate and generate heat through the transducer 3, and M3 is an integer greater than/equal to 1; in the fifth vibration stage, the driving section outputs N5 pulse modules 4 to drive the transducer 3 to vibrate, N5 being an integer greater than/equal to 1.

After the fourth cleaning period is finished, judging whether the cleanliness of the outer lens 2 is higher than a cleanliness threshold value according to a preset algorithm and the image information of the outer lens 2; if the cleanliness is higher than the cleanliness threshold value, the second cleaning period is re-entered, otherwise, the driving part stops outputting the electric signal, and the cleaning process is ended.

Since there is both dust and mist in the dirt, M3 third pulse group units 43 are output to heat in the third heating stage, the mist is removed, and dry dust is left, and the transducer 3 is driven to vibrate cyclically N5 times by N5 pulse modules 4 in the fifth vibration stage.

Preferably, N4 > N5. I.e. the number of cyclic vibrations of the transducer 3 in deicing mode is greater than in dust/mist mode, because the adhesion of the ice layer is greater than that of dust.

The values of N1, N2, N3, N4, N5, M1, M2, and M3 may be the same or different, and are specifically determined according to actual needs, and need to be verified and confirmed in experiments, which are not particularly limited herein.

In addition, an automatic cleaning mode may be preset. And according to a preset algorithm and the image information of the outer lens 2, if the stain of the outer lens 2 is judged not to belong to any one of the first stain type, the second stain type, the third stain type and the fourth stain type, entering an automatic cleaning mode. In the automatic cleaning mode, a plurality of pulse modules 4 are arranged to drive the transducer 3 to vibrate, so that the cleaning cycle is a fifth cleaning cycle. After the fifth cleaning period is finished, judging whether the cleanliness of the outer lens 2 is higher than a cleanliness threshold value according to a preset algorithm and the image information of the outer lens 2; if the cleanliness is higher than the cleanliness threshold value, the second cleaning period is re-entered, otherwise, the driving part stops outputting the electric signal, and the cleaning process is ended.

In summary, each cleaning mode has a respective preset working procedure, and the vibration conduction and heating of the external lens 2 are realized by using a controllable frequency conversion mode as a whole. Typical cleaning mode: the first stage is to set a frequency range according to the type of stains and the natural frequency of the outer lens 2, and generate a pulse group with pulse interval T2, pulse number P and total duration T1 in the frequency range; the Q groups of pulses with different frequency ranges form a basic pulse module 4, wherein P, Q is an integer greater than 1. Each cleaning mode consists of at least one pulse module 4 and at least one third pulse group unit 43 in a different arrangement of vibration and heating.

In summary, the application converts the electric energy into the mechanical energy through the transducer 3, and realizes the mirror cleaning in an ultrasonic vibration decontamination mode, and compared with the traditional cleaning means, the application does not need extra water and gas as cleaning media. The type of the stains is automatically identified through a preset algorithm, and the stains are automatically cleaned according to the cleaning mode corresponding to the type of the stains, so that the efficiency is high and the energy consumption is low while the cleaning effect is ensured.

It should be understood that the above embodiments are only for explaining the present application, the protection scope of the present application is not limited thereto, and any person skilled in the art should be able to modify, replace and combine the technical solution according to the present application and the inventive concept within the scope of the present application.

Claims

1. A cleaning system for camera modules, characterized in that:

the camera module comprises a camera and an outer lens serving as a cleaning object, and the outer lens is positioned at the side of the camera facing the shot object;

the cleaning system comprises a transducer which is in butt joint with the outer lens and is connected with a driving part, and the transducer can drive the outer lens to vibrate under the driving of an electric signal output by the driving part so as to remove stains attached to the outer lens;

the electric signal output by the driving part comprises a pulse module, and the pulse module at least comprises a first pulse group unit and a second pulse group unit;

in the cleaning process, judging the type of the stains attached to the outer lens in advance, and cleaning the outer lens according to a cleaning mode corresponding to the type of the stains by the cleaning system;

the method comprises the following steps of presetting a first cleaning mode corresponding to a first stain type, and cleaning according to the following steps:

entering a first vibration stage, wherein the driving part outputs N1 pulse modules to drive the transducer to vibrate, the process is used as a first cleaning period, and N1 is an integer greater than/equal to 1;

after the first cleaning period is finished, judging whether the cleanliness of the outer lens is higher than a preset cleanliness threshold; and if the cleanliness is higher than the cleanliness threshold value, re-entering the first cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

2. The cleaning system for camera modules of claim 1, wherein:

the driving unit may further output a third pulse group unit which lasts for a predetermined time and has a constant frequency;

presetting a second cleaning mode corresponding to a second stain type, and performing cleaning operation according to the following steps:

sequentially entering a second vibration stage, a first heating stage and a third vibration stage, wherein the process is used as a second cleaning period;

wherein, in the second vibration stage, the driving part outputs N2 pulse modules to drive the transducer to vibrate, and N2 is an integer greater than/equal to 1;

in the first heating stage, the driving part outputs M1 third pulse group units, drives the outer lens to vibrate and generate heat through the transducer, and M1 is an integer greater than/equal to 1;

in the third vibration stage, the driving part outputs N3 pulse modules to drive the transducer to vibrate, wherein N3 is an integer greater than/equal to 1;

after the second cleaning period is finished, judging whether the cleanliness of the outer lens is higher than the cleanliness threshold; and if the cleanliness is higher than the cleanliness threshold value, re-entering the second cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

3. The cleaning system for camera modules of claim 2, wherein:

N2＞N1。

4. the cleaning system for camera modules of claim 2, wherein:

presetting a third cleaning mode corresponding to a third stain type, and performing cleaning operation according to the following steps:

sequentially entering a second heating stage and a fourth vibration stage, and taking the process as a third cleaning period;

wherein, in the second heating stage, the driving part outputs M2 third pulse group units, drives the outer lens to vibrate and generate heat through the transducer, and M2 is an integer greater than/equal to 1;

in the fourth vibration stage, the driving part outputs N4 pulse modules to drive the transducer to vibrate, and N4 is an integer greater than/equal to 1;

after the third cleaning period is finished, judging whether the cleanliness of the outer lens is higher than the cleanliness threshold; and if the cleanliness is higher than the cleanliness threshold value, re-entering the second cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

5. The cleaning system for camera modules of claim 4, wherein:

presetting a fourth cleaning mode corresponding to a fourth stain type, and performing cleaning operation according to the following steps:

sequentially entering a third heating stage and a fifth vibration stage, and taking the process as a fourth cleaning period;

wherein, in the third heating stage, the driving part outputs M3 third pulse group units, drives the outer lens to vibrate and generate heat through the transducer, and M3 is an integer greater than/equal to 1;

in the fifth vibration stage, the driving part outputs N5 pulse modules to drive the transducer to vibrate, N5 is an integer greater than/equal to 1,

after the fourth cleaning period is finished, judging whether the cleanliness of the outer lens is higher than the cleanliness threshold; and if the cleanliness is higher than the cleanliness threshold value, re-entering the second cleaning period, otherwise, stopping outputting an electric signal by the driving part, and ending the cleaning process.

6. The cleaning system for camera modules of claim 5, wherein:

N4＞N5。

7. the cleaning system for camera modules of any of claims 1-6, wherein:

the first pulse group unit comprises a first pulse group and a second pulse group, and the second pulse group unit comprises a third pulse group and a fourth pulse group;

the frequency of the pulses in the third pulse group and the fourth pulse group is far away from the natural frequency of the outer lens relative to the frequency of the pulses in the first pulse group and the second pulse group.

8. The cleaning system for camera modules of any of claims 1-6, wherein:

the frequency of the pulse of any one of the first pulse group, the second pulse group, the third pulse group and the fourth pulse group is gradually increased.

9. The cleaning system for camera modules of any of claims 1-6, wherein:

the transducer is arranged on one side of the outer lens, which is close to the camera, and in an assembled state, the transducer is annular around the optical axis of the camera.

10. The cleaning system for camera modules of claim 9, wherein:

the transducer vibrates under the drive of the drive portion to form a standing wave at the outer lens.

11. An imaging module is provided with a camera and an outer lens positioned at the side of the camera facing a shot object; the method is characterized in that:

a cleaning system for camera modules according to any one of claims 1-10.