CN114779558B - Gland type automatic heating camera module for raindrop detection - Google Patents
Gland type automatic heating camera module for raindrop detection Download PDFInfo
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- CN114779558B CN114779558B CN202210408701.3A CN202210408701A CN114779558B CN 114779558 B CN114779558 B CN 114779558B CN 202210408701 A CN202210408701 A CN 202210408701A CN 114779558 B CN114779558 B CN 114779558B
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- camera module
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- 238000001514 detection method Methods 0.000 title claims abstract description 93
- 238000010438 heat treatment Methods 0.000 title claims abstract description 52
- 210000004907 gland Anatomy 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000011521 glass Substances 0.000 claims abstract description 23
- 230000005669 field effect Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 230000009123 feedback regulation Effects 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000007689 inspection Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002070 nanowire Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/56—Accessories
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B29/00—Combinations of cameras, projectors or photographic printing apparatus with non-photographic non-optical apparatus, e.g. clocks or weapons; Cameras having the shape of other objects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/52—Elements optimising image sensor operation, e.g. for electromagnetic interference [EMI] protection or temperature control by heat transfer or cooling elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
This application is a divisional application with application number 202010361907.6. The embodiment of the invention discloses a gland type automatic heating camera module for raindrop detection, which at least comprises a lens barrel, a first lens arranged at the front end of the lens barrel, and a gland matched with the front end of the lens barrel to lock the first lens on the lens barrel, wherein a glass substrate is arranged between the front end surface of the gland and the first lens, the outer surface of the glass substrate is provided with a raindrop detection element, and the inner surface of the glass substrate is provided with a heating sheet capable of heating the raindrop detection element. According to the gland type automatic heating camera module for raindrop detection, disclosed by the embodiment of the invention, the raindrop detection element is arranged on the glass substrate in front of the first lens, so that automatic detection of raindrops or water vapor is realized in cold, humid or rainy and other rainy and foggy days, and an accurate detection control signal is provided for the subsequent automatic raindrop removal control.
Description
The application is a divisional application, the application number of the original application is 202010361907.6, the application date is 2020, 04 month and 30 days, and the invention name is 'raindrop detection automatic heating raindrop removal water vapor camera shooting module'.
Technical field:
the invention relates to a camera module, in particular to a gland type automatic heating camera module for raindrop detection.
The background technology is as follows:
at present, an outdoor monitoring camera module or an external vehicle-mounted camera module generally cannot automatically detect raindrops or water vapor in cold, humid, rainy or other rainy and foggy days, and achieves the effect of automatically removing the raindrops and the water vapor.
The invention comprises the following steps:
in order to solve the problem that the existing camera module cannot realize automatic detection of raindrops or water vapor generally, the embodiment of the invention provides a gland type automatic heating camera module for raindrop detection.
The gland type automatic heating camera module for raindrop detection at least comprises a lens cone, a first lens arranged at the front end of the lens cone, and a gland matched with the front end of the lens cone to lock the first lens on the lens cone, wherein a glass substrate is arranged between the front end face of the gland and the first lens, a raindrop detection element is arranged on the outer surface of the glass substrate, and a heating sheet capable of heating the glass substrate is arranged on the inner surface of the glass substrate;
also included is a control circuit comprising:
the input end of the detection circuit is electrically connected with a raindrop detection element, and the raindrop detection element is used for acquiring a sensing signal of 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;
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;
the detection circuit comprises an operational amplifier, wherein the output pin of the operational amplifier is connected to the acquisition end of the rainfall sensing signal through a plurality of line resistors, the output pin of the operational amplifier is connected to a microprocessor to feed back a first signal of whether the rainfall exists or not, and the normal phase pin of the operational amplifier is connected to the microprocessor to feed back a second signal of the rainfall;
a line resistor R18 and a line resistor R19 are connected in series between an output pin of the operational amplifier and an acquisition end of the rainfall sensing signal, and two ends of the resistor R18 are connected in parallel with a capacitor C34; the output pin of the operational amplifier is connected with the low potential end of an LED indicator lamp, the negative phase pin of the operational amplifier is grounded through a sliding resistor R20, and the connection point of the line resistor R18 and the line resistor R19 is connected with the sliding arm end of the sliding resistor R20 to realize feedback regulation;
the microprocessor acquires a first signal Dout from the output end of the operational amplifier and directly reflects whether raindrops exist at present; acquiring a second signal Aout from a normal phase pin of the operational amplifier, wherein the second signal Aout synchronously reflects the change of the first signal Dout, and the peak value of the second signal Aout is smaller and can be identified by the microprocessor; when the rain potential is continuous, the microprocessor adjusts the frequency of the PWM signal output by the microprocessor, and the effective heating power is improved.
According to the gland type automatic heating camera module for raindrop detection, disclosed by the embodiment of the invention, the raindrop detection element is arranged on the glass substrate in front of the first lens, so that automatic detection of raindrops or water vapor is realized in cold, humid or rainy and other rainy and foggy days, and an accurate detection control signal is provided for the subsequent automatic raindrop removal control.
Description of the drawings:
in order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a raindrop detection element according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of a raindrop detection element of the present invention;
FIG. 3 is a front view of an embodiment of a raindrop detection element of the present invention;
FIG. 4 is a cross-sectional view of an embodiment of a raindrop detection element of the present invention;
fig. 5 is an enlarged view of a portion a of fig. 4;
FIG. 6 is a cross-sectional view of another embodiment of a raindrop detection element of the present invention
Fig. 7 is an enlarged view of a portion B of fig. 6;
FIG. 8 is a perspective view of one embodiment of a raindrop detection raindrop removal water vapor lens of the present invention;
FIG. 9 is a second perspective view of an embodiment of a raindrop detection raindrop removal water vapor lens of the present invention;
FIG. 10 is a cross-sectional view of FIG. 9;
FIG. 11 is a schematic explosion diagram I of FIG. 9;
FIG. 12 is a second explosion diagram of FIG. 9;
FIG. 13 is a perspective view of another embodiment of a raindrop detection raindrop removal water vapor lens of the present invention;
FIG. 14 is a cross-sectional view of FIG. 13;
FIG. 15 is a schematic diagram of an embodiment of a camera module according to the present invention;
FIG. 16 is an exploded view of FIG. 15;
FIG. 17 is a schematic diagram of another embodiment of a camera module according to the present invention;
FIG. 18 is an exploded view of FIG. 17;
FIG. 19 is a schematic view of a camera module according to another embodiment of the present invention;
FIG. 20 is a schematic diagram of the principle framework of the control circuit of the present invention;
FIG. 21 is a schematic diagram of a detection circuit of the present invention;
fig. 22 is a schematic diagram of a driving circuit of the present invention.
The specific embodiment is as follows:
in order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
When embodiments of the present invention refer to the ordinal terms "first," "second," etc., it is to be understood that they are merely used for distinguishing between them unless the order of their presentation is indeed dependent on the context.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1-3, the embodiment of the invention discloses a raindrop detection element 1, which comprises an element body, wherein electrode pairs (11, 12) are printed on the element body at intervals, and when the element body is matched with an image pickup module, sensing signals of whether raindrops or water vapor exist on the image pickup module are acquired through the electrode pairs (11, 12) at intervals.
According to the raindrop detection element or the camera module, when water drops or water vapor are condensed on the electrode pairs arranged at intervals, the electric signals between the electrode pairs arranged at intervals are changed, so that a sensing signal whether raindrops or water vapor exist is formed, automatic raindrop or water vapor detection is realized in raindrop or water vapor weather such as cold, damp or rainy days, and an accurate detection control signal is provided for automatic raindrop removal and water vapor removal control of the subsequent camera module.
Further, as a preferred embodiment of the present invention, but not limited to, when there is a raindrop or vapor, the electrode pairs (11, 12) disposed at intervals on the element body output a low-level sensing signal; when no raindrops or water vapor exist, high-level sensing signals are output between electrode pairs (11, 12) which are arranged on the element body at intervals. Simple structure detects accurately.
Still further, as a preferred embodiment of the present solution, but not limiting, the electrode pair comprises two wires arranged in parallel. The two wires can be two capacitance polar plates with potential difference, and can also be ITO conductive strips.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the element body is annular. Simple structure can conveniently with make a video recording the module cooperation.
Further, as a preferred embodiment of the present invention, but not limited to, the cross section of the element body is planar or arc-shaped, and the electrode pairs (11, 12) are arranged at intervals on the planar or arc-shaped surface. The structure is simple, the raindrop detection element can be arranged on the object plane side of the first lens of the camera module, or on the annular groove between the object plane side and the image plane side of the first lens, or on the outer side surface of the glass substrate in the gland of the camera module and in front of the first lens, so that various installation matching modes are realized, and the adaptability is better.
Still further, as a preferred embodiment of the present invention, but not limited thereto, 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 an ITO conductive strip; or the substrate layer is provided with a touch control film, and the touch control film is provided with a nano wire.
Still further, as a preferred embodiment of the present invention, but not limiting, the electrode pair (11, 12) is embedded on the element body and flush with the upper surface of the element body. The structure is simple.
Further, as a preferred embodiment of the present invention, not limiting, the entire thickness of the element body is 0.6 to 1mm. Simple structure, does not influence the product volume after the installation.
As shown in fig. 8-10, the embodiment of the invention also discloses an image pickup module, which at least comprises an optical lens, wherein the raindrop detection element is arranged in the optical lens.
According to the raindrop detection element or the camera module, when water drops or water vapor are condensed on the electrode pairs arranged at intervals, the electric signals between the electrode pairs arranged at intervals are changed, so that a sensing signal whether raindrops or water vapor exist is formed, automatic raindrop or water vapor detection is realized in raindrop or water vapor weather such as cold, damp or rainy days, and an accurate detection control signal is provided for automatic raindrop removal and water vapor removal control of the subsequent camera module.
As shown in fig. 8, the embodiment of the invention also discloses a raindrop detection raindrop removal water vapor lens, which comprises a first lens 2 and a heating sheet 3 capable of heating the first lens 2, wherein the first lens 2 is also provided with a raindrop detection element 1.
According to the raindrop detection raindrop removal and vapor removal lens disclosed by the embodiment of the invention, the raindrop detection element is arranged on the first lens, so that automatic raindrop or vapor detection is realized in cold, humid, rainy or other rainy and fog days, and an accurate detection control signal is provided for subsequent automatic raindrop removal and vapor removal control.
Further, as shown in fig. 13 and 14, the raindrop detection element 1 is provided on the object plane side of the first lens 2 as a preferred embodiment of the present embodiment, not limited thereto. Simple structure, simple to operate can accurately realize raindrop or steam automated inspection.
Still further, as a preferred implementation of the present embodiment, as shown in fig. 13 and 14, the first lens 2 is a unitary lens, or the first lens 2 is a combined lens formed by split gluing. Simple structure can accurately realize raindrop or steam automated inspection.
Further, as a preferred implementation of the present embodiment, but not limited to, as shown in fig. 8-12, the first lens 2 is a combined lens formed by split gluing, and the raindrop detection element 1 is disposed between the gluing surfaces of the combined lens. The rain drop detection element is more compact in installation, and automatic detection of rain drops or water vapor can be accurately achieved.
Still further, as a preferred implementation manner of this embodiment, but not limited to, as shown in fig. 8-12, the combined lens includes a front lens 21 and a rear lens 22, and as shown in fig. 11, an annular groove 210 is formed on a side of a bonding surface of the front lens 21 opposite to the rear lens 22, and the raindrop detection element 1 is disposed on the annular groove 210. Simple structure, raindrop detection element simple to operate, the structure is compacter, can accurately realize raindrop or steam automated inspection.
Still further, as a preferred embodiment of the present embodiment, but not limited to, as shown in fig. 8 to 14, the heating sheet is disposed on the image plane side of the first lens 2. Simple structure, the convenience carries out heat treatment to first lens.
As shown in fig. 15, the embodiment of the invention also discloses an automatic heating raindrop removing and vapor-removing camera module for raindrop detection, which at least comprises a lens barrel 4, a first lens 2 arranged at the front end of the lens barrel 4, a gland 5 matched with the front end of the lens barrel 4 to lock the first lens 2 on the lens barrel 4, and a heating plate 3 capable of heating the first lens 2, wherein the first lens 2 is also provided with a raindrop detecting element 1.
According to the automatic heating raindrop removal and vapor removal camera module for raindrop detection, the raindrop detection element is arranged on the first lens, so that automatic detection of raindrops or vapor is realized in cold, humid, rainy or other rainy and foggy days, and an accurate detection control signal is provided for subsequent automatic raindrop removal and vapor removal control.
Further, as a preferred implementation manner of the present embodiment, as shown in fig. 15, the front end of the lens barrel 4 is large, the rear end is small, the front end of the lens barrel 4 is concavely provided with a accommodating cavity matched with the first lens 2, a second wiring groove 42 penetrating the accommodating cavity is formed in the accommodating cavity near the outer side wall of the accommodating cavity, a first wiring groove 41 is formed in the upper side of the outer side wall of the accommodating cavity, and the first wiring groove 41 and the second wiring groove 42 extend along the optical axis direction of the camera module respectively. The first wiring groove 41 is used for allowing a wiring terminal electrically connected with the raindrop detection element 1 to pass through the first wiring groove 41; and a second wiring groove 42 for the connection terminal electrically connected with the heating sheet 3 to pass out of the second wiring groove 42. Simple structure, straight line is convenient, pleasing to the eye.
Still further, as a preferred implementation of the present embodiment, but not limited to, as shown in fig. 15, the first lens 2 is a combined lens formed by split gluing, and the raindrop detection element 1 is disposed between the gluing surfaces of the combined lens. The rain drop detection element is more compact in installation, and automatic detection of rain drops or water vapor can be accurately achieved.
Further, as a preferred implementation of the present embodiment, as shown in fig. 11, but not limited to, the combination lens 2 includes a front lens 21 and a rear lens 22, an annular groove 210 is formed on a side of a bonding surface of the front lens 21 opposite to the rear lens 22, and the raindrop detection element 1 is disposed on the annular groove 210. Simple structure, raindrop detection element simple to operate, the structure is compacter, can accurately realize raindrop or steam automated inspection.
As shown in fig. 18, the embodiment of the invention also discloses an external automatic heating raindrop removing and vapor capturing module for raindrop detection, which at least comprises a lens barrel 4, a first lens 2 arranged at the front end of the lens barrel 4, a gland 5 matched with the front end of the lens barrel 4 to lock the first lens 2 on the lens barrel 4, and a heating plate 3 capable of heating the first lens 2, wherein a raindrop detecting element 1 is arranged on the outer surface of the object surface side of the first lens 2.
According to the external automatic heating raindrop removal and vapor removal camera module for raindrop detection, the raindrop detection element is arranged on the first lens, so that automatic detection of raindrops or vapor is realized in cold, humid, rainy or other rainy and foggy days, and an accurate detection control signal is provided for subsequent automatic raindrop removal and vapor removal control.
Further, as a preferred embodiment of the present embodiment, but not limited to, as shown in fig. 18 and 19, the first lens 2 is an integral lens, and the heating sheet 3 is disposed on the image plane side of the first lens 2.
As shown in fig. 19, the embodiment of the invention also discloses a capping type automatic heating camera module for detecting raindrops, which at least comprises a lens barrel 4, a first lens 2 arranged at the front end of the lens barrel 4, and a capping 5 matched with the front end of the lens barrel 4 to lock the first lens 2 on the lens barrel 4, wherein a glass substrate 6 is arranged between the front end surface of the capping 5 and the first lens 2, a raindrop detection element 1 is arranged on the outer surface of the glass substrate 6, and a heating sheet 3 capable of heating the glass substrate 6 is arranged on the inner surface of the glass substrate 6.
According to the gland type automatic heating camera module for raindrop detection, disclosed by the embodiment of the invention, the raindrop detection element is arranged on the glass substrate in front of the first lens, so that automatic detection of raindrops or water vapor is realized in cold, humid or rainy and other rainy and foggy days, and an accurate detection control signal is provided for the subsequent automatic raindrop removal control.
Further, as a preferred implementation of the present embodiment, not by way of limitation, a spacer is further provided between the glass substrate 6 and the first lens 2.
Still further, the embodiment of the invention also discloses a control circuit, which is matched with the camera module shown in fig. 14, 18 and 19 and is used for enabling the heating sheet 3 of the camera module to automatically start heating when the raindrop detection element 1 detects that raindrops or water vapor exist on the outer surface of the first lens 2 or the outer surface of the glass substrate 6, so that the function of automatically removing the raindrops and the water vapor is realized.
Further, as a preferred implementation of the present embodiment, and not by way of limitation, as shown in fig. 20-22, the control circuit includes:
the input end of the detection circuit is electrically connected with the raindrop detection element 1, and the raindrop detection element 1 is used for acquiring a sensing signal of 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 3 and is used for driving the heating sheet 3 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. When the raindrop detection element 1 detects that raindrops or water vapor exist on the outer surface of the first lens 2 or the outer surface of the glass substrate 6, the heating sheet 3 of the camera module is automatically started to be heated, so that the function of automatically removing the raindrops and the water vapor is realized.
Still further, as a preferred implementation manner of this embodiment, but not limited to, as shown in fig. 21, the detection circuit includes an operational amplifier U7, an output pin OUTA of the operational amplifier U7 is connected to a rain sensing signal acquiring end rain sensing detection through line resistors R18 and R19, and a capacitor C34 is connected in parallel to two ends of the resistor R18; the output pin OUTA of the operational amplifier U7 is connected to the microprocessor U6 to feedback the first signal Dout of whether the raindrops exist or not, and the normal phase pin ina+ of the operational amplifier U7 is connected to the microprocessor U6 to feedback the second signal Aout of the magnitude of the raindrops; the output pin of the operational amplifier U7 is connected with the low potential end of an LED indicator lamp LED1, the negative phase pin INA-of the operational amplifier U7 is grounded through a sliding resistor R20, and the connection point of the line resistors R18 and R19 is connected with the sliding arm end of the sliding resistor R20 to realize feedback adjustment. .
Still further, as a preferred implementation manner of this embodiment, but not limited to, as shown in fig. 22, the driving circuit includes a triode Q3, resistors R13 and R14, a field effect transistor U5, and a plurality of filter capacitors, where a source of the field effect transistor U5 is connected to a direct current source, a drain thereof is used as an electrical output terminal of the driving circuit, and the plurality of filter capacitors are connected in parallel; the resistor R13 is connected in series with the resistor R14 and then connected between the source electrode and the ground end of the field effect tube U5, the connection point of the resistor R13 and the resistor R14 is connected with the grid electrode of the field effect tube U5, the triode Q3 is connected with the resistor R14 in parallel, the base electrode of the triode Q3 is connected to the microprocessor, the two ends of the resistor R13 are connected with the voltage stabilizing tube D4 in parallel, and the triode Q3 is controlled by PWM signals of the microprocessor to realize on/off.
The working principle of the control circuit is as follows:
after the circuit is electrified, the output of the raindrop detection element 1 continuously generates a high-level signal, the high-level signal is captured by the detection circuit, the LED indicator lamp is extinguished, and the microprocessor judges that the raindrop state is not generated at the moment; when raindrops are arranged on the first lens or outside the first lens, the rain sensing signal is changed from high level to low level due to the capacitance characteristic of the raindrop detection element 1, the LED indicator lights, and the microprocessor immediately responds to the LED indicator lights to start the heating sheet to heat the first lens.
In the concrete implementation, the microprocessor acquires a first signal Dout from the output end of the operational amplifier to directly reflect whether raindrops exist at present; acquiring a second signal Aout from a normal phase pin of the operational amplifier, wherein the second signal Aout synchronously reflects the change of the first signal Dout, and the peak value of the second signal Aout is smaller and can be identified by the microprocessor; when the rain potential is continuous, the microprocessor adjusts the frequency of the PWM signal output by the microprocessor, so that the effective heating power is improved, and no raindrops or water vapor are accumulated on the first lens 2 of the camera module or the glass substrate 6.
The foregoing description of one or more embodiments provided in connection with the specific disclosure is not intended to limit the practice of the invention to such description. The method, structure, etc. similar to or identical to those of the present invention, or some technical deductions or substitutions are made on the premise of the inventive concept, should be regarded as the protection scope of the present invention.
Claims (6)
1. The gland type raindrop detection automatic heating camera module at least comprises a lens cone, a first lens arranged at the front end of the lens cone, and a gland matched with the front end of the lens cone to lock the first lens on the lens cone, and is characterized in that,
a glass substrate is arranged between the front end face of the gland and the first lens, a raindrop detection element is arranged on the outer surface of the glass substrate, and a heating sheet capable of heating the glass substrate is arranged on the inner surface of the glass substrate;
also included is a control circuit comprising:
the input end of the detection circuit is electrically connected with a raindrop detection element, and the raindrop detection element is used for acquiring a sensing signal of 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;
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;
the detection circuit comprises an operational amplifier, wherein the output pin of the operational amplifier is connected to the acquisition end of the rainfall sensing signal through a plurality of line resistors, the output pin of the operational amplifier is connected to a microprocessor to feed back a first signal of whether the rainfall exists or not, and the normal phase pin of the operational amplifier is connected to the microprocessor to feed back a second signal of the rainfall;
a line resistor R18 and a line resistor R19 are connected in series between an output pin of the operational amplifier and an acquisition end of the rainfall sensing signal, and two ends of the resistor R18 are connected in parallel with a capacitor C34; the output pin of the operational amplifier is connected with the low potential end of an LED indicator lamp, the negative phase pin of the operational amplifier is grounded through a sliding resistor R20, and the connection point of the line resistor R18 and the line resistor R19 is connected with the sliding arm end of the sliding resistor R20 to realize feedback regulation;
the microprocessor acquires a first signal Dout from the output end of the operational amplifier and directly reflects whether raindrops exist at present; acquiring a second signal Aout from a normal phase pin of the operational amplifier, wherein the second signal Aout synchronously reflects the change of the first signal Dout, and the peak value of the second signal Aout is smaller and can be identified by the microprocessor; when the rain potential is continuous, the microprocessor adjusts the frequency of the PWM signal output by the microprocessor, and the effective heating power is improved.
2. The automatic heating camera module for detecting gland type raindrops according to claim 1, wherein the first lens is an integral lens or a combined lens formed by split gluing.
3. The capped type automatic heating camera module for detecting raindrops as claimed in claim 1 or 2, wherein the raindrop detecting element comprises an element body on which electrode pairs are printed at intervals.
4. The automatic heating camera module for detecting gland type raindrops according to claim 1 or 2, wherein when raindrops or water vapor exist, the electrode pairs arranged on the element body at intervals output low-level sensing signals; when no raindrops or water vapor exist, the electrode pairs arranged on the element body at intervals output high-level sensing signals.
5. The automatic heating camera module for detecting gland type raindrops according to claim 1 or 2, wherein the driving circuit comprises a triode Q3, resistors R13 and R14, a field effect tube U5 and a plurality of filter capacitors, the source electrode of the field effect tube U5 is connected with a direct current source, the drain electrode of the field effect tube U5 is used as the electric output end of the driving circuit, and the filter capacitors are connected in parallel; the resistor R13 and the resistor R14 are connected in series and then connected between the source electrode and the ground end of the field effect tube U5, the connection point of the resistor R13 and the resistor R14 is connected with the grid electrode of the field effect tube U5, the triode Q3 is connected with the resistor R14 in parallel, and the base electrode of the triode Q is connected to the microprocessor.
6. The automatic heating camera module for detecting gland type raindrops according to claim 1 or 2, wherein the voltage stabilizing tube D4 is connected in parallel with two ends of the resistor R13.
Priority Applications (1)
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| CN202210408701.3A CN114779558B (en) | 2020-04-30 | 2020-04-30 | Gland type automatic heating camera module for raindrop detection |
| CN202010361907.6A CN111474810A (en) | 2020-04-30 | 2020-04-30 | Raindrop detection automatic heating raindrop removing and steam removing camera module |
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| CN202210408701.3A Active CN114779558B (en) | 2020-04-30 | 2020-04-30 | Gland type automatic heating camera module for raindrop detection |
| CN202010508312.9A Active CN111812918B (en) | 2020-04-30 | 2020-04-30 | Press cover type raindrop detection automatic heating raindrop removing and steam removing camera module |
| CN202010508314.8A Active CN111812919B (en) | 2020-04-30 | 2020-04-30 | External raindrop detection automatic heating raindrop removing and steam removing camera module |
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| Publication number | Publication date |
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| CN111812918B (en) | 2022-07-05 |
| CN111812919A (en) | 2020-10-23 |
| CN111474810A (en) | 2020-07-31 |
| CN114779558A (en) | 2022-07-22 |
| CN111812918A (en) | 2020-10-23 |
| CN111812921A (en) | 2020-10-23 |
| CN111812921B (en) | 2023-02-28 |
| CN111812919B (en) | 2022-07-05 |
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