CN107613220A - Camera aperture drive circuit - Google Patents
Camera aperture drive circuit Download PDFInfo
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- CN107613220A CN107613220A CN201710938201.XA CN201710938201A CN107613220A CN 107613220 A CN107613220 A CN 107613220A CN 201710938201 A CN201710938201 A CN 201710938201A CN 107613220 A CN107613220 A CN 107613220A
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 148
- 238000013016 damping Methods 0.000 claims abstract description 47
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Abstract
The invention discloses a kind of camera aperture drive circuit, the camera includes damping coil and driving aperture, and the camera aperture drive circuit includes PWM module, the first amplification module, voltage bias module and the second amplification module；The PWM module is used to produce pwm signal；First amplification module is used to be amplified the pwm signal, and pwm signal is once amplified in generation, and the once amplification pwm signal is sent into second amplification module；The second amplification module is stated to be used to be amplified damping current signal caused by the once amplification pwm signal and the damping coil, and once amplifying pwm signal described in after amplification and the damping current signal is sent to the driving aperture, the damping coil is used for the electric current for gathering the driving aperture.The present invention can realize the precise positioning of aperture by adjusting the dutycycle of pwm signal caused by PWM module come driving force size.
Description
Technical field
The present invention relates to camera technical field, more particularly to a kind of camera aperture drive circuit.
Background technology
IP Camera (WEB CAMERA, abbreviation WEBCAM), it is that one kind is produced with reference to traditional cameras with network technology
Raw video camera of new generation, if standard web browser (as " Microsoft IE or Netscape), you can monitor its shadow
Picture.
IP Camera is the new generation product that traditional cameras is combined with network video technique, except possessing general biography
Have under one's command outside all image capture functions of camera, also built-in digitalization compressed controller and the operating system based on WEB in machine,
So that after the compressed encryption of video data, by LAN, internet or wireless network deliver to terminal user.And remote subscriber
The web browser of standard can be used on PC, according to the IP address of web camera, web camera is conducted interviews, in real time
Monitoring objective scene situation, and can to image document real-time edition and storage, while can also control video camera head and
Camera lens, monitored in all directions.
Driving aperture is usually provided with IP Camera, for adjusting the size of camera aperture, in the prior art, light
The regulation of circle size is relied primarily on regulation manually and regulation is either driven by the way of analog signal driving, but these are adjusted
The problem of aperture positioning precision is inadequate all be present in section mode.
The content of the invention
A kind of therefore, camera aperture drive circuit high it is an object of the invention to propose aperture positioning precision.
A kind of camera aperture drive circuit, the camera include damping coil and driving aperture, the camera light
Circle drive circuit includes PWM module, the first amplification module, voltage bias module and the second amplification module；
The PWM module is connected with the first input end of first amplification module, and the PWM module is used to produce PWM
Signal；
Second input of first amplification module is connected with the voltage bias module, first amplification module
Output end is connected with the first input end of second amplification module, and first amplification module is used to enter the pwm signal
Row amplification, pwm signal is once amplified in generation, and the once amplification pwm signal is sent into second amplification module；
Positive pole of the first input end of second amplification module also with the damping coil is connected, the second amplification mould
Second input of block is connected with the negative pole of the damping coil, the output end of second amplification module and the driving aperture
Positive pole connection, second amplification module is used to once amplify damping caused by pwm signal and the damping coil to described
Current signal is amplified, and will once amplify pwm signal described in after amplification and the damping current signal is sent to described
Aperture is driven, the damping coil is used for the electric current for gathering the driving aperture.
, can be by adjusting caused by PWM module when implementing according to camera aperture drive circuit provided by the invention
The dutycycle of pwm signal carrys out driving force size, realizes the precise positioning of aperture, specifically, PWM caused by PWM module believes
Number first by being sent after the amplification of the first amplification module to the second amplification module, because the second amplification module is connected to damping wire
The both positive and negative polarity of circle and the positive pole for driving aperture, therefore when driving aperture is adjusted, under the damping action of damping coil,
Aperture can be opened or closed slowly, and damping coil can sample to the electric current for driving aperture, drive the electric current of aperture with
The position of aperture is related, and different current values corresponds to different aperture positions, and the second amplification module have received through the first amplification
Pwm signal after module amplification, and the output end of the second amplification module is connected to driving aperture, therefore by changing PWM duties
Than, can change driving aperture electric current size, so as to realize the regulation of aperture position, when the electric current that damping coil samples
When value is more than a certain threshold value, reduce PWM duty cycle, to reduce electric current, and when the current value that damping coil samples is less than the threshold
During value, increase PWM duty cycle, to increase electric current, repeat said process, that is, realize the fixation of current value, and fixed fixation
The corresponding a certain position of aperture of value, finally realizes the positioning of aperture, compared with prior art, is driven by using above-mentioned camera aperture
Dynamic circuit, by being amplified twice to pwm signal, and finally realize by changing PWM duty cycle the positioning of aperture, Neng Gouyou
The positioning precision of effect lifting aperture.
In addition, camera aperture drive circuit according to the above embodiment of the present invention, can also have skill additional as follows
Art feature：
Further, in one embodiment of the invention, it is anti-phase also to include first for the camera aperture drive circuit
Amplification module, the first anti-phase amplification module first input end with first amplification module and first amplification respectively
The output end connection of module, the first anti-phase amplification module are used to carry out anti-phase amplification to the pwm signal.Described first is anti-
Phase amplification module can use first resistor.
Wherein, by setting the first anti-phase amplification module, anti-phase amplification can be carried out to pwm signal, improves signal intensity,
So as to improve reliability, and the first anti-phase amplification module uses first resistor, and cost is relatively low.
Further, in one embodiment of the invention, it is anti-phase also to include second for the camera aperture drive circuit
Amplification module, the second anti-phase amplification module first input end with second amplification module and second amplification respectively
The output end connection of module, the second anti-phase amplification module are used to once amplify pwm signal and the damping current to described
Signal carries out anti-phase amplification.The second anti-phase amplification module can include the first electric capacity in parallel and second resistance.
Wherein, by setting the second anti-phase amplification module once to amplify pwm signal and the damping current signal to described
Anti-phase amplification is carried out, can further improve reliability.
Further, in one embodiment of the invention, the camera aperture drive circuit also includes the first filtering
Module, first input end of first filtration module respectively with the PWM module and first amplification module is connected, described
First filtration module is used to be filtered pwm signal caused by the PWM module.
First filtration module can include 3rd resistor, the 4th resistance and the 5th resistance of series connection, first filter
Ripple module also includes the second electric capacity and the 6th resistance, and one end of second electric capacity is connected to the 3rd resistor and the described 4th
Between resistance, other end ground connection, one end of the 6th resistance is connected between the 4th resistance and the 5th resistance, separately
One end is grounded.
Wherein, by setting the first filtration module to be filtered pwm signal, signal interference is reduced.
Further, in one embodiment of the invention, the voltage bias module include series connection the 7th resistance and
8th resistance, the voltage bias module also include the 9th resistance and the tenth resistance, one end of the 9th resistance and described the
Seven resistance are connected, and other end ground connection, one end of the tenth resistance is connected between the 7th resistance and the 8th resistance,
The other end is grounded.
Further, in one embodiment of the invention, the camera aperture drive circuit also includes the 3rd amplification
Module, the 3rd amplification module are connected between the output end of second amplification module and the positive pole of the driving aperture,
3rd amplification module is used for the current signal for amplifying the driving aperture, and the 3rd amplification module includes what is be sequentially connected in series
Triode, the 11st resistance, the first magnetic bead and the 12nd resistance, the base stage of the triode are defeated with second amplification module
Go out end connection, the colelctor electrode of the triode is connected with the 12nd resistance, the emitter stage of the triode and the described tenth
One resistance is connected, and the positive pole of the driving aperture is connected between first magnetic bead and the 12nd resistance.
Wherein, by setting the 3rd amplification module to be amplified the current signal for driving aperture, can further improve
The reliability of the circuit.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the structural representation of camera aperture drive circuit according to an embodiment of the invention；
Fig. 2 is the physical circuit schematic diagram of camera aperture drive circuit according to an embodiment of the invention.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.Some embodiments of the present invention are given in accompanying drawing.But the present invention can be with perhaps
More different form is realized, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is to make
To the disclosure more thorough and comprehensive.
It should be noted that when element is referred to as " being fixedly arranged on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side ", " on ", " under " and similar statement is for illustrative purposes only, rather than instruction or the device or member that imply meaning
Part must have specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；It can be machine
Tool connects or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be two members
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.Term as used herein " and/or " include the arbitrary of one or more related Listed Items and
All combinations.
Driving aperture is usually provided with IP Camera, for adjusting the size of camera aperture, aperture size at present
Regulation rely primarily on manually regulation or using analog signal drive by the way of be driven regulation, but these regulative modes
The problem of aperture positions inadequate precision all be present.In order to solve the problem, it is high that the present embodiment provides a kind of aperture positioning precision
Camera aperture drive circuit.
Referring to Fig. 1, the camera aperture drive circuit that one embodiment of the invention provides, for convenience of description, only shows
The part related to the embodiment of the present invention.The camera includes damping coil 11 and driving aperture 12, it is possible to understand that, this is taken the photograph
As head should also include the base components such as the single-chip microcomputer related to the circuit that the present embodiment provides, AD/DA modular converters, the shooting
Head aperture drive circuit includes PWM module 10, the first amplification module 20, the amplification module 40 of voltage bias module 30 and second.
The PWM module 10 is connected with the first input end of first amplification module 20, and the PWM module 10 is used to produce
Raw pwm signal；
Second input of first amplification module 20 is connected with one end of the voltage bias module 30, the voltage
The other end connection biased electrical pressure side 50 of biasing module 30, in the present embodiment, the voltage of the connection biased electrical pressure side 50 is
3.3V, the output end of first amplification module 20 are connected with the first input end of second amplification module 40, and described first
Amplification module 20 is used to be amplified the pwm signal, and pwm signal is once amplified in generation, and once amplifies PWM letters by described in
Number it is sent to second amplification module 40；
Positive pole of the first input end of second amplification module 40 also with the damping coil 11 is connected, and described second puts
Second input of big module 40 is connected with the negative pole of the damping coil 11, the output end of second amplification module 40 and institute
The positive pole connection of driving aperture 12 is stated, second amplification module 40 is used to once amplify pwm signal and the damping to described
Damping current signal is amplified caused by coil 11, and will once amplify pwm signal and the damping electricity described in after amplification
Stream signal is sent to the driving aperture 12, and the damping coil 11 is used for the electric current for gathering the driving aperture 12.
According to camera aperture drive circuit provided by the invention, when implementing, can be produced by adjusting PWM module 10
The dutycycle of pwm signal carry out driving force size, the precise positioning of aperture is realized, specifically, caused by PWM module 10
Pwm signal after the amplification of the first amplification module 20 first by sending to the second amplification module 40, due to the second amplification module 40
When being connected to the both positive and negative polarity of damping coil 11 and drive the positive pole of aperture 12, therefore driving aperture 12 being adjusted, hindering
Under the damping action of Buddhist nun's coil 11, aperture can be opened or closed slowly, and damping coil 11 can be to the electric current of driving aperture 12
Being sampled, drive the electric current of aperture 12 related to the position of aperture, different current values corresponds to different aperture positions, and the
Two amplification modules 40 have received the pwm signal after the amplification of the first amplification module 20, and the output end of the second amplification module 40 connects
Driving aperture 12 has been connect, therefore by changing PWM duty cycle, the size of the electric current of driving aperture 12 can have been changed, so as to realize
The regulation of aperture position, when the current value that damping coil 11 samples is more than a certain threshold value, reduce PWM duty cycle, to reduce
Electric current, and when the current value that damping coil 11 samples is less than the threshold value, increase PWM duty cycle, to increase electric current, in repetition
Process is stated, that is, realizes the fixation of current value, and fixed fixed value corresponds to a certain position of aperture, finally realizes determining for aperture
Position, compared with prior art, by using above-mentioned camera aperture drive circuit, by being amplified twice to pwm signal, and lead to
Cross and change the positioning that PWM duty cycle finally realizes aperture, can effectively lift the positioning precision of aperture.
Further, referring to Fig. 2, as a specific example, first amplification module 20 and second amplification
Module 40 uses operational amplifier.The first input end of first amplification module 20 is No. 2 pins, the first amplification mould
Second input of block 20 is No. 3 pins, and the output end of first amplification module 20 is No. 1 pin.The second amplification mould
The first input end of block 40 is No. 6 pins, and the second input of second amplification module 40 is No. 5 pins, and described second puts
The output end of big module 40 is No. 7 pins.The positive pole of the damping coil 11 is DAMP+, and the positive pole of the damping coil 11 is
DAMP-, the positive pole of the driving aperture 12 is DRIVE+, the negative pole ground connection of the driving aperture 12.
Further, the camera aperture drive circuit also includes the first anti-phase amplification module 60, and described first is anti-phase
Amplification module 60 connects with the first input end of first amplification module 20 and the output end of first amplification module 20 respectively
Connect, the first anti-phase amplification module 60 is used to carry out anti-phase amplification to the pwm signal.The first anti-phase amplification module 60
Using first resistor 601.By setting the first anti-phase amplification module 60, anti-phase amplification can be carried out to pwm signal, improve signal
Intensity, so as to improve reliability, and the first anti-phase amplification module 60 uses first resistor 601, and cost is relatively low.
Further, the camera aperture drive circuit also includes the second anti-phase amplification module 70, and described second is anti-phase
Amplification module 70 connects with the first input end of second amplification module 40 and the output end of second amplification module 40 respectively
Connect, the second anti-phase amplification module 70 is used for anti-phase to the once amplification pwm signal and damping current signal progress
Amplification.First electric capacity 701 and second resistance 702 of the second anti-phase amplification module 70 for example including parallel connection.By setting the
Two anti-phase amplification modules 70 once amplify pwm signal and the anti-phase amplification of damping current signal progress to described, can enter one
Step improves reliability.
Further, the camera aperture drive circuit also includes the first filtration module 80, first filtration module
80 first input end respectively with the PWM module 10 and first amplification module 20 is connected, first filtration module 80
For being filtered to pwm signal caused by the PWM module 10.
Specifically, first filtration module 80 includes 3rd resistor 801, the 4th resistance 802 and the 5th resistance of series connection
803, first filtration module 80 also includes the second electric capacity 804 and the 6th resistance 805, and one end of second electric capacity 804 connects
It is connected between the 3rd resistor 801 and the 4th resistance 802, other end ground connection, one end connection of the 6th resistance 805
Between the 4th resistance 802 and the 5th resistance 803, other end ground connection.By setting the first filtration module 80 to PWM
Signal is filtered, and reduces signal interference.
Specifically, the voltage bias module 30 includes the 7th resistance 301 and the 8th resistance 302 of series connection, the voltage
Biasing module 30 also includes the 9th resistance 303 and the tenth resistance 304, one end and the 7th resistance of the 9th resistance 303
301 connections, other end ground connection, one end of the tenth resistance 304 is connected to the 7th resistance 301 and the 8th resistance
Between 302, other end ground connection.
Further, the camera aperture drive circuit also includes the 3rd amplification module 100, the 3rd amplification module
100 are connected between the positive pole of the output end of second amplification module 40 and the driving aperture 12, the 3rd amplification mould
Block 100 is used for the current signal for amplifying the driving aperture 12, and the 3rd amplification module 100 includes the triode being sequentially connected in series
101st, the 11st resistance 102, the first magnetic bead 103 and the 12nd resistance 104, the base stage of the triode 101 are put with described second
The output end connection of big module 40, the colelctor electrode of the triode 101 are connected with the 12nd resistance 104, the triode
101 emitter stage is connected with the 11st resistance 102, and the positive pole of the driving aperture 12 is connected to first magnetic bead 103
Between the 12nd resistance 104.By setting the 3rd amplification module 100 to put the current signal for driving aperture 12
Greatly, the reliability of the circuit can further be improved.
In addition, the camera aperture drive circuit that the present embodiment provides also includes being connected to the positive pole of damping coil 11 and second
The first π type filter circuits between the first input end of amplification module 40, the first π type filtered electrical routing resistances R132, magnetic bead
LB7, electric capacity C133 and resistance R125 compositions, between the negative pole of damping coil 11 and the 2nd 1 input of the second amplification module 40
The 2nd π type filter circuits, the 2nd π type filtered electrical routing resistances R141, magnetic bead LB8, electric capacity C134 and resistance R138 groups
Into.Two π types filter circuits are used to be filtered the electric current of damping coil 11, reduce interference.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of camera aperture drive circuit, the camera includes damping coil and driving aperture, it is characterised in that described
Camera aperture drive circuit includes PWM module, the first amplification module, voltage bias module and the second amplification module；
The PWM module is connected with the first input end of first amplification module, and the PWM module is used to produce pwm signal；
Second input of first amplification module is connected with the voltage bias module, the output of first amplification module
End is connected with the first input end of second amplification module, and first amplification module is used to put the pwm signal
Greatly, produce and once amplify pwm signal, and the once amplification pwm signal is sent to second amplification module；
Positive pole of the first input end of second amplification module also with the damping coil is connected, second amplification module
Second input is connected with the negative pole of the damping coil, and the output end of second amplification module is driving aperture just with described
Pole connects, and second amplification module is used to once amplify damping current caused by pwm signal and the damping coil to described
Signal is amplified, and will once amplify pwm signal described in after amplification and the damping current signal is sent to the driving
Aperture, the damping coil are used for the electric current for gathering the driving aperture.
2. camera aperture drive circuit according to claim 1, it is characterised in that the camera aperture drive circuit
Also include the first anti-phase amplification module, the first anti-phase amplification module first input end with first amplification module respectively
Connected with the output end of first amplification module, the first anti-phase amplification module is used for anti-phase to pwm signal progress
Amplification.
3. camera aperture drive circuit according to claim 2, it is characterised in that the first anti-phase amplification module is adopted
Use first resistor.
4. camera aperture drive circuit according to claim 1, it is characterised in that the camera aperture drive circuit
Also include the second anti-phase amplification module, the second anti-phase amplification module first input end with second amplification module respectively
Connected with the output end of second amplification module, the second anti-phase amplification module is used to once amplify pwm signal to described
Anti-phase amplification is carried out with the damping current signal.
5. camera aperture drive circuit according to claim 4, it is characterised in that the second anti-phase amplification module bag
Include the first electric capacity and second resistance of parallel connection.
6. camera aperture drive circuit according to claim 1, it is characterised in that the camera aperture drive circuit
Also include the first filtration module, first filtration module respectively with the PWM module and first amplification module first
Input connects, and first filtration module is used to be filtered pwm signal caused by the PWM module.
7. camera aperture drive circuit according to claim 6, it is characterised in that first filtration module includes string
The 3rd resistor of connection, the 4th resistance and the 5th resistance, first filtration module also includes the second electric capacity and the 6th resistance, described
One end of second electric capacity is connected between the 3rd resistor and the 4th resistance, other end ground connection, the 6th resistance
One end is connected between the 4th resistance and the 5th resistance, other end ground connection.
8. camera aperture drive circuit according to claim 1, it is characterised in that the voltage bias module includes string
The 7th resistance and the 8th resistance of connection, the voltage bias module also include the 9th resistance and the tenth resistance, the 9th resistance
One end be connected with the 7th resistance, the other end ground connection, one end of the tenth resistance is connected to the 7th resistance and institute
Between stating the 8th resistance, other end ground connection.
9. camera aperture drive circuit according to claim 1, it is characterised in that the camera aperture drive circuit
Also include the 3rd amplification module, the 3rd amplification module is connected to the output end of second amplification module and the driving light
Between the positive pole of circle, the 3rd amplification module is used for the current signal for amplifying the driving aperture,
10. camera aperture drive circuit according to claim 9, it is characterised in that the 3rd amplification module includes
Triode, the 11st resistance, the first magnetic bead and the 12nd resistance being sequentially connected in series, the base stage of the triode are put with described second
The output end connection of big module, the colelctor electrode of the triode are connected with the 12nd resistance, the emitter stage of the triode
Be connected with the 11st resistance, the positive pole of the driving aperture be connected to first magnetic bead and the 12nd resistance it
Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938201.XA CN107613220B (en) | 2017-09-30 | 2017-09-30 | Camera diaphragm driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938201.XA CN107613220B (en) | 2017-09-30 | 2017-09-30 | Camera diaphragm driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN107613220A true CN107613220A (en) | 2018-01-19 |
| CN107613220B CN107613220B (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710938201.XA Active CN107613220B (en) | 2017-09-30 | 2017-09-30 | Camera diaphragm driving circuit |
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| CN (1) | CN107613220B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1446326A (en) * | 2000-08-03 | 2003-10-01 | 三洋电机株式会社 | Video camera with aperture blades |
| JP2010102085A (en) * | 2008-10-23 | 2010-05-06 | Acutelogic Corp | Iris controller and iris control method |
| CN202602794U (en) * | 2012-05-17 | 2012-12-12 | 杭州本立道科技有限公司 | Automatic focus integrated camera device |
| CN206002820U (en) * | 2016-09-20 | 2017-03-08 | 北京旷视科技有限公司 | Aperture drive circuit, aperture drive system and video camera |
| CN106954028A (en) * | 2017-05-09 | 2017-07-14 | 北京旷视科技有限公司 | A kind of auto iris drive circuit and electronic installation |
-
2017
- 2017-09-30 CN CN201710938201.XA patent/CN107613220B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1446326A (en) * | 2000-08-03 | 2003-10-01 | 三洋电机株式会社 | Video camera with aperture blades |
| JP2010102085A (en) * | 2008-10-23 | 2010-05-06 | Acutelogic Corp | Iris controller and iris control method |
| CN202602794U (en) * | 2012-05-17 | 2012-12-12 | 杭州本立道科技有限公司 | Automatic focus integrated camera device |
| CN206002820U (en) * | 2016-09-20 | 2017-03-08 | 北京旷视科技有限公司 | Aperture drive circuit, aperture drive system and video camera |
| CN106954028A (en) * | 2017-05-09 | 2017-07-14 | 北京旷视科技有限公司 | A kind of auto iris drive circuit and electronic installation |
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|---|---|
| CN107613220B (en) | 2023-12-19 |
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