CN103281825A - 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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- CN103281825A CN103281825A CN2013101913309A CN201310191330A CN103281825A CN 103281825 A CN103281825 A CN 103281825A CN 2013101913309 A CN2013101913309 A CN 2013101913309A CN 201310191330 A CN201310191330 A CN 201310191330A CN 103281825 A CN103281825 A CN 103281825A
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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 the industrial automation field, specifically refer to a kind of AOI digitlization led light source controller and control method thereof.
Background technology
In order to satisfy the reliability requirement that PCB detects, to the PCB complete detection, the best solution of finishing the detection task of repetition, dullness, strictness is to adopt AOI(Automated optical inspection on production line, and automated optical detects) system.The main effect of AOI is that (Surface Mounted Technology SMT) carries out comprehensive strict detection and quality control in the process, find also to reject defective products, thereby guarantees product quality, saving cost to the pcb board surface mount.Compare with other measuring technology, AOI can be used for a plurality of positions on the production line, is mainly used in three operations at present: detect after (1) paste solder printing, in time find the defective in the printing process, will drop to minimum because of the weld defect that soldering paste prints bad generation; (2) detect after the paster, check the defective from paste solder printing and the generation of paster process; (3) behind fluid welding, detect, mainly check the postwelding defective.Check that with respect to artificial visual AOI has higher repeatability and detection speed faster.Along with popularizing of SMT technology, densification and tinyization of SMT components and parts, AOI equipment just is used for monitoring and guarantee product quality by vast electronics manufacturer.
Light source controller is one of part of machine vision applications most critical, can directly influence quality and the effect of image to a great extent.Its main target be with suitable manner with ray cast to testee, making needs observed feature and needs to produce between the uncared-for characteristics of image maximum contrast, also should guarantee enough overall brightnesses simultaneously, when light source is bright inadequately, may have three kinds of bad situations to occur: the first, the signal to noise ratio of camera is not enough; Because the brightness of light source is not enough, the contrast of image is inevitable not enough, and the possibility that occurs noise at image also increases immediately.Secondly, the brightness of light source is not enough, must add large aperture, thereby has reduced the depth of field; And when the brightness of light source was not enough, light such as natural daylight etc. at random also can increase the influence of system.The variation of object space also should not influence the quality of imaging in addition, and the light source that directivity is very strong has increased the possibility to the minute surface reflection generation of highlight regions, and this is unfavorable for the latter feature extraction.Therefore, study a kind of enough overall brightnesses that guarantees, make the light source controller and the control method thereof that need observed feature and need to produce preferable contrast between the uncared-for characteristics of image become a research topic of the present invention.
Summary of the invention
The objective of the invention is to overcome weak point of the prior art, a kind of AOI digitlization led light source controller and control method thereof are provided, guarantee enough overall brightnesses with the light emission measure by the control led light source, making needs observed feature and needs to produce between the uncared-for characteristics of image preferable contrast.
The objective of the invention is to be achieved through the following technical solutions:
A kind of AOI digitlization led light source controller comprises:
Display module is used for showing led light source channel number and corresponding light-source brightness value;
Driver module is used for driving light source and makes a plurality of led light sources sequentially open;
Sensor devices receives from the light of sequentially opening a plurality of led light sources;
Feedback unit is used for based on producing a plurality of feedback signals by sensor devices from the light receiving signal that led light source obtains;
Dimming control unit is used for receiving described a plurality of feedback signals, and produces a plurality of pulse-width signal control driver modules to regulate the described LED light emission measure that is moving 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 the PWM mode controller, the pwm signal output of described PWM mode controller links to each other with the pwm signal input of driver module.
Concrete, described dimming control unit also comprises the stroboscopic mode controller, the stroboscopic signal output part of described stroboscopic mode controller links to each other with the stroboscopic signal input part of driver module.
Preferably, AOI digitlization led light source controller also comprises memory module, and the storage data input/output terminal of described memory module links to each other 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 is used for the output reference voltage signal; Described current controller compares the output pulse width control signal for the current detection signal that will flow through led light source and this reference voltage signal; Described logical AND gate is used for according to described pulse duration control signal, generates a control signal, is used for the switching tube of the adjusting device outside of control led light source.
The present invention further provides a kind of AOI digitlization led light source control method, be used for the light emission measure of control led light source, this method comprises:
Detect the brightness of a plurality of led light sources by sensor devices;
Display module shows led light source channel number and corresponding light-source brightness value;
Feedback unit produces a plurality of feedback signals based on sensor devices from the light receiving signal that led light source obtains;
Dimming control unit receives described a plurality of feedback signal, and produces a plurality of pulse-width signal control driver modules to regulate the described LED light emission measure that is moving respectively.
The step of a plurality of pulse-width signals of described generation comprises at least:
Relatively flow through current detection signal and the reference voltage signal of led light source, when the difference of the current detection signal that flows through led light source and this reference voltage signal surpasses a threshold values, the output pulse width modulation signal.
Described control driver module comprises with the step of regulating the described LED light emission measure that is moving respectively: led light source is in light source is finished once the bright time that changes, and led light source is worked in the mode of PWM constant current.
Described AOI digitlization led light source control method further comprises:
Change led light source in the brightness of finishing at light source once in the bright time that changes by the duty ratio of regulating PWM.
The present invention has the following advantages and beneficial effect compared to existing technology:
1, by adopting AOI digitlization led light source controller of the present invention and light source controller being carried out control method, sensor devices presents the current luminance level that is associated, and by display module digitlization demonstration, adopt the PWM constant-current dimming by dimming control unit again, the PWM light modulation changes the forward current ON time by opening and closing LED and adjusts effect to reach brightness, guarantee enough overall brightnesses, making needs observed feature and needs to produce between the uncared-for characteristics of image preferable contrast.
2, the present invention adopts the PWM mode controller, because LED is with constant electric current PWM dimming mode light modulation, therefore the color shift problem of light regulating technology can not occur simulating, and the PWM light modulation can provide accurate brilliance control under the prerequisite that does not influence colorimetric purity.
3, the present invention adopts the stroboscopic mode controller, can change light source in the brightness of stroboscopic in the time by the duty ratio that changes PWM, thereby obtains distinct image.
Description of drawings
Fig. 1 is the modular structure schematic diagram of AOI digitlization led light source controller of the present invention;
Fig. 2 is the control method flow chart of AOI digitlization led light source controller of the present invention;
Fig. 3 realizes the schematic diagram of stroboscopic illumination mode for adopting the PWM light modulation.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, present embodiment provides a kind of AOI digitlization led light source controller, comprising:
Described dimming control unit 6 comprises PWM mode controller 7, and the pwm signal output of described PWM mode controller 7 links to each other with the pwm signal input of driver module 3.Because LED is with constant electric current PWM dimming mode light modulation, therefore the color shift problem of light regulating technology can not appear simulating, and the PWM light modulation can provide accurate brilliance control under the prerequisite that does not influence colorimetric purity.
Described dimming control unit 6 also comprises stroboscopic mode controller 8, and the stroboscopic signal output part of described stroboscopic mode controller 8 links to each other with the stroboscopic signal input part of driver module 3.Adopt the stroboscopic mode controller, make light source works under strobe mode, the exposure of image was determined by the stroboscopic time, made the shutter speed of camera and the stroboscopic time synchronized of light source, obtained distinct image.
AOI digitlization led light source controller also comprises memory module 9, and the storage data input/output terminal of described memory module 9 links to each other with the storage data input/output terminal of dimming control unit 6.Described memory module is used for storage led light source channel number and corresponding brightness value, when the data of preserving in the led light source channel number of revising by host computer and corresponding brightness value and the described memory module 9 were inconsistent, memory module 9 was preserved amended led light source 2 channel numbers and brightness value automatically.
The present invention also comprises input module 10, is used for input button recognition instruction, and described input module 10 is connected with dimming control unit 6.Described input module is made of key circuit, and the user provides recognition instructions such as led light source channel number and light-source brightness value by this key circuit to described AOI digitlization led light source controller.
Described driver module 3 comprises reference voltage source, current controller and logical AND gate; Described reference voltage source is used for the output reference voltage signal; Described current controller compares the output pulse width control signal for the current detection signal that will flow through led light source and this reference voltage signal; Described logical AND gate is used for according to described pulse duration control signal, generates a control signal, is used for the switching tube of the adjusting device outside of control led light source.The LED driver module is mainly led light source suitable type of drive is provided, the present invention adopts the PWM constant-current dimming, on the basis that does not increase peripheral circuit and extra cost, driver module is connected the convenience that realizes led light source, simply and fast regulates by reference voltage source, current controller and logical AND gate three.
As shown in Figure 2, the present invention further provides a kind of AOI digitlization led light source control method, be used for the light emission measure of control led light source, this method comprises:
The step of a plurality of pulse-width signals of described generation comprises at least:
Relatively flow through current detection signal and the reference voltage signal of led light source, when the difference of the current detection signal that flows through led light source and this reference voltage signal surpasses a threshold values, the output pulse width modulation signal.
Described control driver module comprises with the step of regulating the described LED light emission measure that is moving respectively: led light source is in light source is finished once the bright time that changes, and led light source is worked in the mode of PWM constant current.
Described AOI digitlization led light source control method also comprises: change led light source in the brightness of finishing at light source once in the bright time that changes by the duty ratio of regulating PWM.Fig. 3 realizes the schematic diagram of stroboscopic illumination mode for adopting the PWM light modulation, light source in total time T according to predefined cycle strobe work, cycle strobe is that light source is finished once the bright time that changes, in a cycle strobe t, the operating time of light source is to be t1 the stroboscopic time, inner light source is worked in the mode of PWM constant current at this moment, can change light source in the brightness of stroboscopic in the time by the duty ratio that changes PWM, thereby acquisition distinct image, work total time, the stroboscopic illumination mode finished during greater than T.
Above-described embodiment is preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. an AOI digitlization led light source controller is characterized in that, comprising:
Display module is used for showing led light source channel number and corresponding light-source brightness value;
Driver module is used for driving light source and makes a plurality of led light sources sequentially open;
Sensor devices receives from the light of sequentially opening a plurality of led light sources;
Feedback unit is used for based on producing a plurality of feedback signals by sensor devices from the light receiving signal that led light source obtains;
Dimming control unit is used for receiving described a plurality of feedback signals, and produces a plurality of pulse-width signal control driver modules to regulate the described LED light emission measure that is moving respectively.
Described sensor devices is connected with feedback unit, and described display module, driver module, feedback unit are connected with described dimming control unit.
2. according to the described AOI digitlization of claim 1 led light source controller, it is characterized in that: described dimming control unit comprises the PWM mode controller, and the pwm signal output of described PWM mode controller links to each other with the pwm signal input of driver module.
3. according to the described AOI digitlization of claim 1 led light source controller, it is characterized in that: described dimming control unit also comprises the stroboscopic mode controller, and the stroboscopic signal output part of described stroboscopic mode controller links to each other with the stroboscopic signal input part of driver module.
4. according to the described AOI digitlization of claim 1 led light source controller, it is characterized in that: AOI digitlization led light source controller also comprises memory module, and the storage data input/output terminal of described memory module links to each other with the storage data input/output terminal of dimming control unit.
5. according to each described AOI digitlization led light source controller of claim 1～4, it is characterized in that: described driver module comprises reference voltage source, current controller and logical AND gate; Described reference voltage source is used for the output reference voltage signal; Described current controller compares the output pulse width control signal for the current detection signal that will flow through led light source and this reference voltage signal; Described logical AND gate is used for according to described pulse duration control signal, generates a control signal, is used for the switching tube of the adjusting device outside of control led light source.
6. AOI digitlization led light source control method is used for the light emission measure of control led light source, and this method comprises:
Detect the brightness of a plurality of led light sources by sensor devices;
Display module shows led light source channel number and corresponding light-source brightness value;
Feedback unit produces a plurality of feedback signals based on sensor devices from the light receiving signal that led light source obtains;
Dimming control unit receives described a plurality of feedback signal, and produces a plurality of pulse-width signal control driver modules to regulate the described LED light emission measure that is moving respectively.
7. according to the described AOI digitlization of claim 6 led light source control method, it is characterized in that the step of a plurality of pulse-width signals of described generation comprises at least:
Relatively flow through current detection signal and the reference voltage signal of led light source, when the difference of the current detection signal that flows through led light source and this reference voltage signal surpasses a threshold values, the output pulse width modulation signal.
8. according to the described AOI digitlization of claim 7 led light source control method, it is characterized in that, the step that described control driver module is regulated the described LED light emission measure that is moving respectively comprises: led light source is in light source is finished once the bright time that changes, and light source is worked in the mode of PWM constant current.
9. described AOI digitlization led light source control method according to Claim 8 is characterized in that described AOI digitlization led light source control method further comprises:
Change led light source in the brightness of finishing at light source once in the bright time that changes by the duty ratio of regulating PWM.
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