CN111474810A - Raindrop detection automatic heating raindrop removing and steam removing camera module - Google Patents

Abstract

The embodiment of the invention discloses an automatic heating, raindrop removing and steam removing camera module for raindrop detection, which at least comprises a lens barrel, a first lens arranged at the front end of the lens barrel, a gland matched with the front end of the lens barrel to lock the first lens on the lens barrel, and a heating sheet capable of heating the first lens, wherein the first lens is also provided with a raindrop detection element. According to the automatic heating, raindrop removing and steam removing camera module for raindrop detection, provided by the embodiment of the invention, the raindrop detection element is arranged on the first lens, so that automatic raindrop or steam detection is realized in rainy and foggy days such as cold weather, humid weather or rain, and accurate detection control signals are provided for the subsequent control of automatically removing raindrops and steam.

Description

Raindrop detection automatic heating to remove raindrops and water vapor camera module

Technical field:

The invention relates to a camera module, in particular to a camera module for raindrop detection, automatic heating, raindrop removal and water vapor removal.

Background technique:

At present, camera modules for outdoor monitoring, or external vehicle-mounted camera modules, are generally unable to automatically detect raindrops or water vapor in cold, humid, or rainy and other rainy and foggy weather, and achieve the effect of automatically removing raindrops and water vapor.

Invention content:

In order to overcome the problem that the existing camera modules generally cannot realize the automatic detection of raindrops or water vapor, the embodiment of the present invention provides a camera module for raindrop detection and automatic heating to remove raindrops and water vapor.

The raindrop detection automatic heating and raindrop removal and water vapor removal camera module includes at least a lens barrel, a first lens arranged at the front end of the lens barrel, a gland that cooperates with the front end of the lens barrel to lock the first lens on the lens barrel, and a The first lens is heated by a heating plate, and the first lens is also provided with a raindrop detection element.

In the raindrop detection automatic heating and water vapor removal camera module according to the embodiment of the present invention, the raindrop detection element is arranged on the first lens, so as to realize the automatic detection of raindrops or water vapor in rainy and foggy weather such as cold, humid, or rain, which is a follow-up The control of automatic raindrop removal and water vapor removal provides precise detection control signals.

Description of drawings:

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram 1 of an embodiment of a raindrop detection element of the present invention;

Fig. 2 is the second structural schematic diagram of the raindrop detection element embodiment of the present invention;

Fig. 3 is the front view of the raindrop detection element embodiment of the present invention;

4 is a cross-sectional view of an embodiment of a raindrop detection element of the present invention;

Fig. 5 is the enlarged view of A part of Fig. 4;

6 is a cross-sectional view of another embodiment of the raindrop detection element of the present invention

FIG. 7 is an enlarged view of part B of FIG. 6;

8 is a perspective view 1 of an embodiment of the raindrop detection and raindrop removal and water vapor removal lens according to the present invention;

9 is a perspective view 2 of an embodiment of the raindrop detection and raindrop removal and water vapor removal lens according to the present invention;

Fig. 10 is the sectional view of Fig. 9;

Fig. 11 is the explosion schematic diagram one of Fig. 9;

Fig. 12 is the explosion schematic diagram II of Fig. 9;

13 is a perspective view of another embodiment of the raindrop detection and raindrop removal lens of the present invention;

Fig. 14 is the sectional view of Fig. 13;

15 is a schematic structural diagram of an embodiment of a camera module of the present invention;

Figure 16 is the exploded view of Figure 15;

17 is a schematic structural diagram of another embodiment of a camera module of the present invention;

Fig. 18 is the exploded view of Fig. 17;

19 is a schematic structural diagram of another embodiment of a camera module of the present invention;

20 is a schematic diagram of the principle framework of the control circuit of the present invention;

21 is a schematic diagram of a detection circuit of the present invention;

FIG. 22 is a schematic diagram of the driving circuit of the present invention.

Detailed ways:

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

When ordinal numbers such as "first" and "second" are mentioned in the embodiments of the present invention, unless they really express the meaning of order according to the context, it should be understood that they are only used for distinction.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in Figures 1-3, an embodiment of the present invention discloses a raindrop detection element 1, which includes an element body, and electrode pairs (11, 12) arranged at intervals are printed on the element body. When the element body is matched with the camera module, the The sensing signal of whether there is raindrops or water vapor on the camera module is acquired through the electrode pairs (11, 12) arranged at intervals.

In the raindrop detection element or the camera module according to the embodiment of the present invention, when water droplets or water vapor condense on the electrode pairs arranged at intervals, the electrical signals between the electrode pairs arranged at intervals will be changed, thereby forming a sensing signal of whether there are raindrops or water vapor. , to achieve automatic detection of raindrops or water vapor in rainy and foggy weather such as cold, wet, or rain, and provide accurate detection control signals for the subsequent camera modules to automatically remove raindrops and water vapor.

Further, as a preferred embodiment of this solution, but not limited, when there are raindrops or water vapor, the electrode pair (11, 12) arranged at intervals on the element body outputs a low-level sensing signal; when there is no raindrop or water vapor, the element A high-level sensing signal is output between the electrode pairs (11, 12) arranged at intervals on the body. Simple structure and accurate detection.

Still further, as a preferred implementation manner of this solution, but not a limitation, the electrode pair includes two wires arranged in parallel. The two wires can be two capacitor plates with potential difference, or can be ITO conductive strips.

Still further, as a preferred implementation manner of this solution, but not a limitation, the element body is annular. The structure is simple and can be easily matched with the camera module.

Further, as a preferred embodiment of this solution, but not limited, the cross section of the element body is in the shape of a plane or an arc, and the electrode pairs (11, 12) are arranged at intervals on the plane or arc. The structure is simple, and the raindrop detection element can be installed on the object surface side of the first lens of the camera module, or on the annular groove between the object surface side and the image surface side of the first lens, or in the cover of the camera module and located in the first lens. The outer side of the glass substrate in front of a lens can realize a variety of installation and matching methods, and the adaptability is better.

Still further, as a preferred embodiment of this solution, but not limited, the element body is a flexible transparent substrate layer. In this embodiment, the flexible transparent substrate layer includes, but is not limited to, a PET film layer. The substrate layer is covered with an ITO conductive film, and the ITO conductive film is etched to form ITO conductive strips; or a touch film is provided on the substrate layer, and nanowires are provided on the touch film.

Still further, as a preferred embodiment of this solution, but not limited, the electrode pair (11, 12) is embedded on the element body and is flush with the upper surface of the element body. Simple structure.

Further, as a preferred embodiment of this solution, but not limited, the overall thickness of the element body is 0.6-1 mm. The structure is simple, and the product volume is not affected after installation.

As shown in FIGS. 8-10 , an embodiment of the present invention further discloses a camera module, which at least includes an optical lens, and the above-mentioned raindrop detection element is installed in the optical lens.

In the raindrop detection element or camera module of the embodiment of the present invention, when water droplets or water vapor condense on the electrode pairs arranged at intervals, the electrical signals between the electrode pairs arranged at intervals will be changed, thereby forming a sensing signal of whether there are raindrops or water vapor. , to achieve automatic detection of raindrops or water vapor in rainy and foggy weather such as cold, wet, or rain, and provide accurate detection control signals for the subsequent camera modules to automatically remove raindrops and water vapor.

As shown in FIG. 8 , an embodiment of the present invention also discloses a raindrop detection, raindrop and water vapor removal lens, which includes a first lens 2 and a heating plate 3 capable of heating the first lens 2 , and the first lens 2 also has a A raindrop detection element 1 is provided.

In the raindrop detection, raindrop and water vapor removal lens according to the embodiment of the present invention, a raindrop detection element is arranged on the first lens, so as to realize the automatic detection of raindrops or water vapor in rainy and foggy weather such as cold, wet, or rain, so as to automatically remove raindrops and remove them for subsequent automatic raindrop removal. The control of water vapor provides precise detection and control signals.

Further, as shown in FIGS. 13 and 14 , as a preferred implementation of this embodiment, but not limited, the raindrop detection element 1 is provided on the object surface side of the first lens 2 . The structure is simple, the installation is convenient, and the automatic detection of raindrops or water vapor can be accurately realized.

Still further, as a preferred implementation of this embodiment, but not limited, as shown in FIGS. 13 and 14 , the first lens 2 is an integral lens, or the first lens 2 is a combination lens that is cemented separately. The structure is simple, and the automatic detection of raindrops or water vapor can be accurately realized.

Further, as a preferred implementation of this embodiment, but not limited, as shown in Figures 8-12, the first lens 2 is a composite lens that is cemented separately, and the raindrop detection element 1 is provided between the cemented surfaces of the composite lens. between. The structure is simple, the installation of raindrop detection components is more compact, and the automatic detection of raindrops or water vapor can be accurately realized.

Still further, as a preferred implementation of this embodiment, but not limited, as shown in Figs. 8-12, the combined lens includes a front lens 21 and a rear lens 22. As shown in Fig. 11, the front lens 21 is connected to the rear lens. An annular groove 210 is formed on the opposite side of the gluing surface 22 , and the raindrop detection element 1 is arranged on the annular groove 210 . The structure is simple, the raindrop detection element is easy to install, and the structure is more compact, which can accurately realize the automatic detection of raindrops or water vapor.

Further, as a preferred implementation of this embodiment, but not limited, as shown in FIGS. 8-14 , the heating plate is provided on the image plane side of the first lens 2 . The structure is simple, and the heating treatment of the first lens is convenient.

As shown in FIG. 15 , an embodiment of the present invention also discloses a raindrop detection automatic heating, raindrop and water vapor removal camera module, which at least includes a lens barrel 4 , a first lens 2 disposed at the front end of the lens barrel 4 , and a front end of the lens barrel 4 . The first lens 2 is also provided with a raindrop detection element 1 in cooperation with the cover 5 for locking the first lens 2 on the lens barrel 4 and the heating plate 3 which can heat the first lens 2 .

In the raindrop detection automatic heating and water vapor removal camera module according to the embodiment of the present invention, the raindrop detection element is arranged on the first lens, so as to realize the automatic detection of raindrops or water vapor in rainy and foggy weather such as cold, humid, or rain, which is a follow-up The control of automatic raindrop removal and water vapor removal provides precise detection control signals.

Further, as a preferred implementation of this embodiment, but not limited, as shown in FIG. 15 , the front end of the lens barrel 4 is large and the rear end is small, and the front end of the lens barrel 4 is concavely provided with an accommodation that cooperates with the first lens 2 . The inside of the accommodating cavity is provided with a second wiring slot 42 which penetrates through the accommodating cavity near the outer side wall of the accommodating cavity, and a first wiring slot 41 is opened on the upper side of the outer side wall of the accommodating cavity. 41 and the second wiring slot 42 respectively extend along the direction of the optical axis of the camera module. Among them, the first wiring slot 41 is used for connecting terminals electrically connected with the raindrop detection element 1 to pass through the first wiring slot 41 ; and the second wiring slot 42 is used for electrical connection with the heating element 3 . The connecting terminal of the wire is passed through the second wiring slot 42 . The structure is simple, the straight line is convenient and beautiful.

Still further, as a preferred implementation of this embodiment and not limitation, as shown in FIG. 15 , the first lens 2 is a composite lens that is cemented separately, and the raindrop detection element 1 is provided between the cemented surfaces of the composite lens. The structure is simple, the installation of raindrop detection components is more compact, and the automatic detection of raindrops or water vapor can be accurately realized.

Further, as a preferred implementation of this embodiment, but not limited, as shown in FIG. 11 , the combined lens 2 includes a front lens 21 and a rear lens 22, and the front lens 21 is on the side of the cemented surface opposite to the rear lens 22. An annular groove 210 is opened, and the raindrop detection element 1 is arranged on the annular groove 210 . The structure is simple, the raindrop detection element is easy to install, and the structure is more compact, which can accurately realize the automatic detection of raindrops or water vapor.

As shown in FIG. 18 , the embodiment of the present invention also discloses an external raindrop detection automatic heating and water vapor removal camera module, which at least includes a lens barrel 4 , a first lens 2 disposed at the front end of the lens barrel 4 , and a lens barrel 4. The front end cooperates with the cover 5 to lock the first lens 2 on the lens barrel 4, and the heating plate 3 that can heat the first lens 2. The outer surface of the first lens 2 on the object side is provided with a raindrop detection element 1.

In the embodiment of the present invention, an external raindrop detection automatic heating and water vapor removal camera module is provided, and a raindrop detection element is arranged on the first lens, so as to realize the automatic detection of raindrops or water vapor in rainy and foggy weather such as cold, humid, or rain, Provides accurate detection control signals for subsequent automatic raindrop removal and water vapor control.

Further, as a preferred implementation of this embodiment, but not limited, as shown in FIGS. 18 and 19 , the first lens 2 is an integral lens, and the heating plate 3 is provided on the image surface side of the first lens 2 .

As shown in FIG. 19 , the embodiment of the present invention also discloses a cover-type raindrop detection automatic heating and water vapor removal camera module, which at least includes a lens barrel 4 , a first lens 2 disposed at the front end of the lens barrel 4 , and a lens barrel 4 . The front end of the lens barrel 4 is matched with a pressure cover 5 for locking the first lens 2 on the lens barrel 4. A glass substrate 6 is also provided between the front end surface of the pressure cover 5 and the first lens 2. A raindrop detection element 1 is arranged on the surface, and a heating plate 3 that can be heated is arranged on the inner surface of the glass substrate 6 .

In the cover-type raindrop detection automatic heating and water vapor removal camera module of the embodiment of the present invention, raindrop detection elements are arranged on the glass substrate in front of the first lens, so as to realize raindrops in cold, humid, rainy and other rainy and foggy weather. Or automatic detection of water vapor, providing accurate detection control signals for the subsequent control of automatic raindrop removal and water vapor removal.

Further, as a preferred implementation manner of this embodiment, but not a limitation, a spacer is further provided between the glass substrate 6 and the first lens 2 .

Still further, the embodiment of the present invention also discloses a control circuit, which cooperates with the camera modules shown in FIGS. 14 , 18 and 19 to detect the outer surface of the first lens 2 , or When there are raindrops or water vapor on the outer surface of the substrate 6, the heating film 3 of the camera module is automatically started to heat, so as to realize the function of automatically removing raindrops and water vapor.

Further, as a preferred implementation of this embodiment, but not a limitation, as shown in Figures 20-22, the control circuit includes:

a detection circuit, the input end of which is electrically connected to the raindrop detection element 1, and the raindrop detection element 1 is used to obtain a sensing signal of whether there is raindrop or moisture on the first lens or outside the first lens;

The drive circuit, the output end of which is electrically connected with the heating element 3, is used to drive the stop/start of the heating element 3;

The microprocessor is connected to the detection circuit and the driving circuit, and is used for controlling the driving circuit according to the sensing signal. When the raindrop detection element 1 detects raindrops or water vapor on the outer surface of the first lens 2 or the outer surface of the glass substrate 6, the heating element 3 of the camera module is automatically activated to heat, thereby realizing the function of automatically removing raindrops and water vapor.

Still further, as a preferred implementation of this embodiment, but not limited, as shown in FIG. 21 , the detection circuit includes an operational amplifier U7, and the output pin OUTA of the operational amplifier U7 is connected to the circuit via line resistors R18 and R19. Raindrop Detect, the acquisition end of the rain sensor signal, the capacitor C34 is connected in parallel with the two ends of the resistor R18; the output pin OUTA of the operational amplifier U7 is connected to the microprocessor U6 to feed back the first signal Dout of the presence or absence of raindrops, and the operational amplifier The positive phase pin INA+ of U7 is connected to the microprocessor U6 to feed back the second signal Aout of the amount of rainfall; the output pin of the operational amplifier U7 is connected to the low potential end of an LED indicator LED1, and the negative phase pin INA- of the operational amplifier U7 is slid The resistor R20 is grounded, and the connection point of the line resistors R18 and R19 is connected to the sliding arm end of the sliding resistor R20 to realize feedback adjustment. .

Still further, as a preferred implementation of this embodiment, but not limited, as shown in FIG. 22 , the driving circuit includes a transistor Q3, resistors R13 and R14, a field effect transistor U5, and a number of filter capacitors. The source of the effect transistor U5 is connected to the DC source, and its drain is used as the electrical output end of the drive circuit, and is connected with a number of the filter capacitors in parallel; the resistors R13 and R14 are connected in series and then connected to the source and the source of the field effect transistor U5. Between the ground terminals, and the connection point of the resistors R13 and R14 is connected to the gate of the field effect transistor U5, the transistor Q3 is connected in parallel with the resistor R14, and its base is connected to the microprocessor, and the two ends of the resistor R13 are connected in parallel with a stable Pressing the tube D4, the transistor Q3 is controlled by the PWM signal of the microprocessor to realize on/off.

The working principle of this control circuit is as follows:

After the circuit is powered on, the output of the raindrop detection element 1 will continue to generate a high-level signal, which is captured by the detection circuit, the LED indicator light is off, and the microprocessor judges that there is no raindrop at this time; when the first When there are raindrops on the lens or outside the first lens, due to the capacitive characteristics of the raindrop detection element 1, the rain sensor signal changes from high level to low level, the LED indicator lights up, and the microprocessor responds immediately and starts heating. The sheet heats the first lens.

In terms of specific implementation, the microprocessor obtains the first signal Dout from the output end of the operational amplifier, which directly reflects whether there are raindrops at present; and obtains the second signal Aout from the non-inverting pin of the operational amplifier, and the second signal Aout synchronously reflects the first signal Dout. The change of the signal Dout, and its peak value is smaller, can be recognized by the microprocessor; when the rain continues, the microprocessor will adjust the frequency of the PWM signal it outputs to increase the effective heating power and ensure the first lens of the camera module No raindrops or water vapor accumulated on 2 or on the glass substrate 6 .

The above is one or more embodiments provided in combination with specific content, and it is not construed that the specific implementation of the present invention is limited to these descriptions. Anything similar or similar to the method and structure of the present invention, or some technical deductions or substitutions are made on the premise of the concept of the present invention, all should be regarded as the protection scope of the present invention.

Claims (10)

1. Raindrop detects self-heating and removes raindrop and remove vapour camera module, includes the lens cone at least, locates the first lens of lens cone front end, cooperates with the lens cone front end in order to lock the gland on the lens cone with first lens and can carry out the piece that generates heat that heats to first lens, its characterized in that still is equipped with raindrop detecting element on this first lens.

2. The raindrop detection, self-heating, raindrop-removing, and moisture-removing camera module of claim 1, further comprising a control circuit, the control circuit comprising:

the input end of the detection circuit is electrically connected with the raindrop detection element, and the raindrop detection element is used for acquiring a sensing signal whether raindrops or water vapor exist on the first lens or outside the first lens;

the output end of the driving circuit is electrically connected with the heating sheet and is used for driving the heating sheet to stop/start;

and the microprocessor is connected with the detection circuit and the driving circuit and is used for controlling the driving circuit according to the sensing signal.

3. The module of claim 1 or 2, wherein the first lens is a split cemented lens assembly, and the raindrop detection element is disposed between cemented surfaces of the lens assembly.

4. The module of claim 3, wherein the lens assembly comprises a front lens and a rear lens, wherein the front lens has an annular groove on a side of the bonding surface opposite to the rear lens, and the raindrop detection element is disposed on the annular groove.

5. The raindrop detection, self-heating raindrop-removing and moisture-removing camera module according to claim 4, wherein the heating sheet is provided on the first transparent mirror surface side.

6. The module of claim 5, wherein the raindrop detection element comprises an element body having electrode pairs printed thereon at intervals.

7. The module of claim 6, wherein when there is raindrop or water vapor, the electrode pairs spaced apart from each other on the device body output low-level sensing signals; when there is no raindrop or water vapor, the electrode pairs arranged at intervals on the element body output high-level sensing signals.

8. The module of claim 2, wherein the detection circuit comprises an operational amplifier, an output pin of the operational amplifier is connected to the acquisition end of the rainfall sensor signal through a plurality of line resistors, the output pin of the operational amplifier is connected to the microprocessor to feed back the first signal of the presence or absence of the raindrops, and the positive pin of the operational amplifier is connected to the microprocessor to feed back the second signal of the magnitude of the rainfall.

9. The module as claimed in claim 8, wherein the output pin of the operational amplifier is connected in series with the line resistors R18 and R19 and the resistor R18 is connected in parallel with the capacitor C34, the output pin of the operational amplifier is connected to the low potential end of a L ED indicator light, the negative phase pin of the operational amplifier is grounded via a sliding resistor R20, and the connecting point of the line resistors R18 and R19 is connected to the sliding arm end of the sliding resistor R20 for feedback adjustment.

10. The module as claimed in claim 2, wherein the driving circuit comprises a transistor Q3, resistors R13 and R14, a fet U5, and a plurality of filter capacitors, the fet U5 has a source connected to a dc source and a drain connected in parallel to the dc source as an electrical output of the driving circuit; the resistors R13 and R14 are connected in series and then connected between the source electrode of the field effect transistor U5 and the ground, the connection point of the resistors R13 and R14 is connected with the grid electrode of the field effect transistor U5, the triode Q3 is connected with the resistor R14 in parallel, and the base electrode of the triode Q3 is connected to the microprocessor.

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