CN103281825B - AOI (Automated Optical Inspection) digital LED (Light-Emitting Diode) light source controller and control method thereof - Google Patents
AOI (Automated Optical Inspection) digital LED (Light-Emitting Diode) light source controller and control method thereof Download PDFInfo
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Abstract
The invention discloses an AOI (Automated Optical Inspection) digital LED (Light-Emitting Diode) light source controller which comprises a display module, a driving module, a light sensor, a feedback unit and a dimming control unit, wherein the display module is used for displaying an LED light source channel number and a corresponding light source brightness value; the driving module is used for driving light sources so as to enable a plurality of LED light sources to be sequentially switched on; the light sensor is used for receiving light from the LED light sources which are sequentially switched on; the feedback unit is used for generating a plurality of feedback signals on the basis of light receiving signals which are obtained from the LED light sources by the light sensor; and the dimming control unit is used for receiving the plurality of feedback signals and generating a plurality of PWM (Pulse Width Modulation) signals to control the driving module so as to respectively regulate the light emitting quantities of running LEDs. The invention also provides an AOI digital LED light source control method. According to the invention, a PWM constant-current dimming manner is adopted; in the PWM dimming process, forward current conduction time is changed by switching on and switching off the LEDs so as to achieve a brightness regulating effect, ensure sufficient integral brightness and generate more excellent contrast between a feature which needs to be observed and an image feature which needs to be ignored.
Description
Technical field
The present invention relates to the control device of the machine vision LED light source in industrial automation, specifically refer to a kind of AOI digital LED light source controller and control method thereof.
Background technology
In order to meet the reliability requirement that PCB detects, on a production line to PCB complete detection, complete repetition, dullness, strict Detection task best solution be adopt AOI(Automated opticalinspection, automatic optics inspection) system.The Main Function of AOI carries out comprehensively strict detection and quality control in pcb board surface mount (SurfaceMounted Technology, SMT) process, finds and reject defective products, thus ensure product quality, cost-saving.Compared with other measuring technology, AOI can be used for the multiple positions on production line, be mainly used in three operations at present: detect after (1) paste solder printing, the defect in Timeliness coverage printing process, the weld defect because of the bad generation of Solder-Paste Printing is dropped to minimum; (2) detect after paster, check the defect produced from paste solder printing and paster process; (3) at stream inspection after welding, main inspection postwelding defect.Check relative to artificial visual, AOI has higher repeatability and detection speed faster.Along with popularizing of SMT technology, the densification of SMT components and parts and tinyization, AOI equipment is just monitored by vast electronics manufacturing fab commercialization and ensures product quality.
Light source controller is one of part of machine vision applications most critical, to a great extent can the directly quality of effect diagram picture and effect.Its main target be in an appropriate manner by ray cast on testee, the feature making needs observed and need to produce maximum contrast between uncared-for characteristics of image, also should ensure enough overall brightnesses simultaneously, when light source is bright not, three kinds of bad situations may be had to there will be: the first, the signal to noise ratio of camera is inadequate; Because the brightness of light source is inadequate, the contrast of image is not inevitable, image occurs the possibility of noise also increases immediately.Secondly, the brightness of light source is inadequate, must add large aperture, thus reduce the depth of field; And when the brightness of light source is inadequate time, the random light such as natural daylight also can increase the impact of system.The change of object space also should not affect the quality of imaging, the light source that directivity is very strong in addition, and increase the possibility occurred the mirror-reflection of highlight regions, this is unfavorable for feature extraction below.Therefore, study and a kind ofly ensure enough overall brightnesses, the feature making needs observed and needing produces the light source controller of preferably contrast between uncared-for characteristics of image and control method becomes a research topic of the present invention.
Summary of the invention
The object of the invention is to overcome weak point of the prior art, a kind of AOI digital LED light source controller and control method thereof are provided, to ensure enough overall brightnesses by controlling the light emission measure of LED light source, the feature making needs observed and need to produce preferably contrast between uncared-for characteristics of image.
The object of the invention is to be achieved through the following technical solutions:
A kind of AOI digital LED light source controller, comprising:
Display module, for showing the light-source brightness value of LED light source channel number and correspondence;
Driver module, makes multiple LED light source sequentially open for driving light source;
Sensor devices, receives the light from sequentially opening multiple LED light source;
Feedback unit, for producing multiple feedback signal based on by sensor devices from the light receiving signal that LED light source obtains;
Dimming control unit, for receiving described multiple feedback signal, and produces multiple pulse-width signal and controls driver module with the LED light emission measure run described in regulating respectively.
Described sensor devices is connected with feedback unit, and described display module, driver module, feedback unit are connected with described dimming control unit.
Concrete, described dimming control unit comprises PWM mode controller, and the pwm signal output of described PWM mode controller is connected with the pwm signal input of driver module.
Concrete, described dimming control unit also comprises different flash patterns controller, and the strobe signal output of described different flash patterns controller is connected with the strobe signal input of driver module.
Preferably, AOI digital LED light source controller also comprises memory module, and the storage data input/output terminal of described memory module is connected with the storage data input/output terminal of dimming control unit.
Described driver module comprises reference voltage source, current controller and logical AND gate; Described reference voltage source, for output reference voltage signal; Described current controller, for the current detection signal and this reference voltage signal that flow through LED light source are compared, output pulse width control signal; Described logical AND gate, for according to described pulse width control signal, generates a control signal, for controlling the switching tube of the adjusting device outside of LED light source.
The present invention further provides a kind of AOI digital LED light source control method, for controlling the light emission measure of LED light source, the method comprises:
The brightness of multiple LED light source is detected by sensor devices;
The light-source brightness value of display module display LED light source channel number and correspondence;
Feedback unit produces multiple feedback signal based on sensor devices from the light receiving signal that LED light source obtains;
Dimming control unit receives described multiple feedback signal, and produces multiple pulse-width signal and control driver module with the LED light emission measure run described in regulating respectively.
The step of the multiple pulse-width signal of described generation at least comprises:
Relatively flow through current detection signal and the reference voltage signal of LED light source, when the difference of the current detection signal He this reference voltage signal that flow through LED light source is more than a threshold values, output pulse width modulation signal.
Described control driver module comprises with the step of the LED light emission measure run described in regulating respectively: LED light source completes once in the time of bright change at light source, and LED light source works in the mode of PWM constant current.
Described AOI digital LED light source control method comprises further:
The brightness of LED light source within the time completing once bright change at light source is changed by regulating the duty ratio of PWM.
The present invention has the following advantages and beneficial effect compared to existing technology:
1, by adopting AOI digital LED light source controller of the present invention and carrying out control method to light source controller, sensor devices presents the present intensity level be associated, and shown by display module digitlization, PWM constant-current dimming is adopted again by dimming control unit, PWM light modulation changes forward current ON time to reach brightness adjustment effect by opening and closing LED, ensure enough overall brightnesses, the feature making needs observed and need to produce preferably contrast between uncared-for characteristics of image.
2, the present invention adopts PWM mode controller, and because LED is with constant electric current PWM dimming mode light modulation, therefore there will not be the color shift problem of simulation light regulating technology, PWM light modulation can provide accurate luminance to control under the prerequisite not affecting colorimetric purity.
3, the present invention adopts different flash patterns controller, can change the brightness of light source within the stroboscopic time, thus obtain image clearly by the duty ratio changing PWM.
Accompanying drawing explanation
Fig. 1 is the modular structure schematic diagram of AOI digital LED light source controller of the present invention;
Fig. 2 is the control method flow chart of AOI digital LED light source controller of the present invention;
Fig. 3 is the schematic diagram adopting PWM light modulation to realize stroboscopic illumination mode.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, the present embodiment provides a kind of AOI digital LED light source controller, comprising:
Display module 1, for showing the light-source brightness value of LED light source 2 channel number and correspondence; Driver module 3, makes multiple LED light source 2 sequentially open for driving light source; Sensor devices 4, receives the light from sequentially opening multiple LED light source 2; Feedback unit 5, for producing multiple feedback signal based on by sensor devices 4 from the light receiving signal that LED light source 2 obtains; Dimming control unit 6, for receiving described multiple feedback signal, and produce multiple pulse-width signal and control driver module 3 with the LED light emission measure run described in regulating respectively, described sensor devices 4 is connected with feedback unit 5, and described display module 1, driver module 3, feedback unit 5 are connected with described dimming control unit 6.The present invention presents the present intensity level be associated by sensor devices, and shown by display module digitlization, PWM constant-current dimming is adopted again by dimming control unit, PWM light modulation changes forward current ON time to reach brightness adjustment effect by opening and closing LED, ensure enough overall brightnesses, the feature making needs observed and need to produce preferably contrast between uncared-for characteristics of image, even if the change of object space does not affect the quality of imaging yet, be beneficial to feature extraction below.
Described dimming control unit 6 comprises PWM mode controller 7, and the pwm signal output of described PWM mode controller 7 is connected with the pwm signal input of driver module 3.Because LED is with constant electric current PWM dimming mode light modulation, therefore there will not be the color shift problem of simulation light regulating technology, PWM light modulation can provide accurate luminance to control under the prerequisite not affecting colorimetric purity.
Described dimming control unit 6 also comprises different flash patterns controller 8, and the strobe signal output of described different flash patterns controller 8 is connected with the strobe signal input of driver module 3.Adopt different flash patterns controller, make light source works under strobe mode, the exposure of image, by stroboscopic Time dependent, makes the shutter speed of camera and the stroboscopic time synchronized of light source, obtains image clearly.
AOI digital LED light source controller also comprises memory module 9, and the storage data input/output terminal of described memory module 9 is connected with the storage data input/output terminal of dimming control unit 6.Described memory module is for storing the brightness value of LED light source channel number and correspondence, when the data of preserving in the LED light source channel number revised by host computer and corresponding brightness value and described memory module 9 are inconsistent, memory module 9 preserves amended LED light source 2 channel number and brightness value automatically.
The present invention also comprises input module 10, and for input key recognition instruction, described input module 10 is connected with dimming control unit 6.Described input module is made up of key circuit, and user provides the recognition instruction such as LED light source channel number and light-source brightness value by this key circuit to described AOI digital LED light source controller.
Described driver module 3 comprises reference voltage source, current controller and logical AND gate; Described reference voltage source, for output reference voltage signal; Described current controller, for the current detection signal and this reference voltage signal that flow through LED light source are compared, output pulse width control signal; Described logical AND gate, for according to described pulse width control signal, generates a control signal, for controlling the switching tube of the adjusting device outside of LED light source.LED drive module is mainly the type of drive that LED light source provides suitable, the present invention adopts PWM constant-current dimming, on the basis not increasing peripheral circuit and extra cost, driver module by reference voltage source, current controller and logical AND gate three be connected realize LED light source convenience, simply and fast regulate.
As shown in Figure 2, the present invention further provides a kind of AOI digital LED light source control method, for controlling the light emission measure of LED light source, the method comprises:
Step 201, detected the brightness of multiple LED light source by sensor devices;
The light-source brightness value of step 202, display module display LED light source channel number and correspondence;
Step 203, feedback unit produce multiple feedback signal based on sensor devices from the light receiving signal that LED light source obtains;
Step 204, dimming control unit receive described multiple feedback signal, and produce multiple pulse-width signal and control driver module with the LED light emission measure run described in regulating respectively.
The step of the multiple pulse-width signal of described generation at least comprises:
Relatively flow through current detection signal and the reference voltage signal of LED light source, when the difference of the current detection signal He this reference voltage signal that flow through LED light source is more than a threshold values, output pulse width modulation signal.
Described control driver module comprises with the step of the LED light emission measure run described in regulating respectively: LED light source completes once in the time of bright change at light source, and LED light source works in the mode of PWM constant current.
Described AOI digital LED light source control method also comprises: change the brightness of LED light source within the time completing once bright change at light source by regulating the duty ratio of PWM.Fig. 3 is the schematic diagram adopting PWM light modulation to realize stroboscopic illumination mode, light source in total time T according to the cycle strobe work preset, cycle strobe is the time that light source completes once bright change, in a cycle strobe t, the operating time of light source and stroboscopic time are t1, at this moment, inner light source works in the mode of PWM constant current, the brightness of light source within the stroboscopic time can be changed by the duty ratio changing PWM, thus obtain image clearly, when work is greater than T at total time, stroboscopic illumination mode terminates.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. automatic optics inspection (AOI) digitlization LED light source controller, is characterized in that, comprising:
Display module, for showing the light-source brightness value of LED light source channel number and correspondence;
Driver module, makes multiple LED light source sequentially open for driving light source;
Sensor devices, receives the light from sequentially opening multiple LED light source;
Feedback unit, for producing multiple feedback signal based on by sensor devices from the light receiving signal that LED light source obtains;
Dimming control unit, for receiving described multiple feedback signal, and produces multiple pulse-width signal and controls driver module with the LED light emission measure run described in regulating respectively;
Input module, for input key recognition instruction, described input module is connected with dimming control unit,
Described sensor devices is connected with feedback unit, described display module, driver module, feedback unit are connected with described dimming control unit, described dimming control unit comprises PWM mode controller, and the pwm signal output of described PWM mode controller is connected with the pwm signal input of driver module.
2. AOI digital LED light source controller according to claim 1, it is characterized in that: described dimming control unit also comprises different flash patterns controller, the strobe signal output of described different flash patterns controller is connected with the strobe signal input of driver module.
3. AOI digital LED light source controller according to claim 1, it is characterized in that: AOI digital LED light source controller also comprises memory module, the storage data input/output terminal of described memory module is connected with the storage data input/output terminal of dimming control unit.
4. AOI digital LED light source controller according to any one of claims 1 to 3, is characterized in that: described driver module comprises reference voltage source, current controller and logical AND gate; Described reference voltage source, for output reference voltage signal; Described current controller, for the current detection signal and this reference voltage signal that flow through LED light source are compared, output pulse width control signal; Described logical AND gate, for according to described pulse width control signal, generates a control signal, for controlling the switching tube of the adjusting device outside of LED light source.
5. an AOI digital LED light source control method, for controlling the light emission measure of LED light source, the method comprises:
The brightness of multiple LED light source is detected by sensor devices;
The light-source brightness value of display module display LED light source channel number and correspondence;
Feedback unit produces multiple feedback signal based on sensor devices from the light receiving signal that LED light source obtains;
Dimming control unit receives described multiple feedback signal, and produce multiple pulse-width signal and control driver module with the LED light emission measure run described in regulating respectively, the step of the multiple pulse-width signal of described generation at least comprises: compare the current detection signal and reference voltage signal that flow through LED light source, when the difference of the current detection signal He this reference voltage signal that flow through LED light source is more than a threshold values, output pulse width modulation signal.
6. AOI digital LED light source control method according to claim 5, it is characterized in that, the step of the LED light emission measure run described in described control driver module regulates respectively comprises: LED light source completes once in the time of bright change at light source, and light source works in the mode of PWM constant current.
7. AOI digital LED light source control method according to claim 6, it is characterized in that, described AOI digital LED light source control method comprises further:
The brightness of LED light source within the time that light source completes once bright change is changed by regulating the duty ratio of PWM.
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| CN103906321B (en) * | 2014-03-26 | 2016-05-11 | 中国人民解放军第三军医大学 | Non-shutter high speed high stability LED stroboscopic light sources |
| TWI526683B (en) * | 2014-07-10 | 2016-03-21 | Machvision Inc | Method of setting parameters for common setting between optical inspection units |
| CN105156917A (en) * | 2015-03-09 | 2015-12-16 | 龙腾照明集团有限公司 | LED illuminating system with space optical communication function |
| CN111257324B (en) * | 2020-01-17 | 2024-01-12 | 天津理工大学 | On-line detection system based on visual technology |
| WO2022060654A1 (en) * | 2020-09-15 | 2022-03-24 | Jabil Inc. | Method and apparatus for stacking printed circuit board assemblies with single reflow |
| CN113597070B (en) * | 2021-10-08 | 2022-02-15 | 东莞锐视光电科技有限公司 | A multi-channel light source control method and system based on light source controller |
| CN113974526A (en) * | 2021-11-18 | 2022-01-28 | 上海澳华内镜股份有限公司 | A light source device and endoscope with automatic dimming and strobe |
| CN114205949B (en) * | 2022-02-17 | 2022-06-10 | 东莞锐视光电科技有限公司 | A method and system for controlling multiple LED light sources based on a light source controller |
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| CN101221122A (en) * | 2007-01-08 | 2008-07-16 | 牧德科技股份有限公司 | Adjustable light source device and automatic optical detection system with same |
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| CN102866166B (en) * | 2012-09-20 | 2017-10-13 | 天津嘉乐惠电子科技有限公司 | Automatic optical detecting system and method |
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| US7844103B2 (en) * | 2005-10-12 | 2010-11-30 | Applied Materials Israel, Ltd. | Microscopic inspection apparatus for reducing image smear using a pulsed light source and a linear-periodic superpositioned scanning scheme to provide extended pulse duration, and methods useful therefor |
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| CN202561575U (en) * | 2012-03-14 | 2012-11-28 | 廖怀宝 | Optical detection equipment and light-emitting diode (LED) light source device thereof |
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