CN104763928A - LED (Light Emitting Diode) light source for machine vision system and controlling method thereof - Google Patents

Abstract

The invention discloses an LED (Light Emitting Diode) light source for a machine vision system and a controlling method thereof. The LED light source comprises an annular bottom plate, a single-chip computer and a height measurement sensor, wherein the annular bottom plate is uniformly provided with a plurality of radial driving rails on which LED modules and driving parts used for driving the LED modules to move along the driving rails are arranged, the height measurement sensor is arranged at a certain side of the annual bottom plate, and the single-chip computer is used for controlling the motions of the plurality of driving parts so as to adjust the semi-diameter of a circular light source array consisting of a plurality of LED modules according to a distance value acquired by the height measurement sensor. According to the LED light source provided by the invention, the motions of the driving part can be controlled to adjust the semi-diameter of the circular light source array consisting of the plurality of LED modules after a distance value between the LED light source and an irradiating surface is acquired, therefore the uniform lighting can be realized under the condition of lighting at different heights, and the machine vision system can acquire images with higher vision effect, therefore the LED light source can be extensively applied to the machine vision system.

Description

A kind of LED light source for NI Vision Builder for Automated Inspection and control method thereof

Technical field

The present invention relates to the light source field of machine vision, particularly relate to a kind of LED light source for NI Vision Builder for Automated Inspection and control method thereof.

Background technology

Machine vision technique mainly carrys out the visual performance of simulating human with computer, information extraction from the image of objective things, carries out process and is understood, and finally detects for reality, measures and controls.Because machine vision replaces human eye to observe with machine and judges, so the product quality being usually used in high volume production process detects, be not suitable for hazardous environment and the implacable occasion of human eye vision of people.And machine vision improves precision and the speed of detection greatly, the deviation that the eye-observation avoided brings and error.Therefore, machine vision obtains applying very widely in every field, as Aero-Space, industry, military affairs, civilian etc. field.

The input port of NI Vision Builder for Automated Inspection is all generally image capturing system, such as industrial camera.Collect a good visual effect, the image that contrast is large can greatly reduce the image processing work amount in later stage.Illuminator be determine gather the key factor of the quality of image.At present, the lighting source being applied to NI Vision Builder for Automated Inspection is on the market generally ring illumination light source, and these ring illumination light sources are substantially all fixed diameters, and namely the diameter of light source is immutable.

For current this ring illumination light source, if uniform illuminating effect will be maintained, just can only move within the scope of a smaller height change.NI Vision Builder for Automated Inspection detects different characteristic, generally needs the illuminating ray of differing heights, namely needs light incident from different directions.Therefore, when the testing requirement in order to meet NI Vision Builder for Automated Inspection, when the height of ring illumination light source being regulated, often obtaining irradiating uneven effect, causing the visual effect of gathered image poor.

Summary of the invention

In order to solve above-mentioned technical problem, the object of this invention is to provide a kind of LED light source for NI Vision Builder for Automated Inspection, another object of the present invention is to provide a kind of control method of the LED light source for NI Vision Builder for Automated Inspection.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of LED light source for NI Vision Builder for Automated Inspection, comprise annular bottom plate, single-chip microcomputer and the elevation carrection sensor for the distance value that gathers LED light source and shadow surface, described annular bottom plate is provided with equably multiple conveyor track radially, described conveyor track is provided with LED module and for driving LED module along the drive disk assembly of conveyor track movement, described elevation carrection sensor is arranged on the side of annular bottom plate, the radius of the action that the distance value that described single-chip microcomputer is used for gathering according to elevation carrection sensor controls multiple drive disk assembly and then the sphere shape light array that regulates multiple LED module to form.

Further, described annular bottom plate is provided with fixed supporting seat at the end at the center of the close annular bottom plate of each conveyor track, described drive disk assembly is connected with fixed supporting seat, described drive disk assembly comprises motor, motor supporting base, shaft coupling, screw mandrel, slider track and the slide block that can slide on slider track, described motor supporting base and slider track are installed on annular bottom plate, described motor is arranged on motor supporting base, one end of described screw mandrel is connected with motor by shaft coupling, the other end of described screw mandrel is connected with fixed supporting seat, described slide block set is located on screw mandrel, described LED module is connected with slide block, connect with single-chip microcomputer in parallel between the motor of multiple drive disk assembly and move consistent.

Further, the both sides of described slide block are equipped with the pulley for sliding on slider track with movable slider.

Further, described annular bottom plate is all provided with for carrying out spacing travel switch to slide block in the below at the two ends of each screw mandrel.

Further, described LED module comprises LED-baseplate, LED rectangular array and diffused reflector, and described LED rectangular array and diffused reflector are arranged in LED-baseplate successively, and described LED-baseplate is inverted and is arranged on drive disk assembly.

Further, also comprise shell, described shell is just being provided with the centre bore with this central opening same size to the position of the central opening of annular bottom plate.

Further, the radius of the described single-chip microcomputer sphere shape light array that regulates multiple LED module to form according to following formula:

$r=\sqrt{\frac{2}{m+3}}h-r_0$

In above formula, r represents the regulated value of the radius of the sphere shape light array that multiple LED module forms, and h represents the distance value that elevation carrection sensor gathers, r ¹represent the optimal illumination radius of the sphere shape light array of current time LED module composition, m represents the coefficient relevant to the characteristics of luminescence of LED module, r ₀represent the illumination radius of the sphere shape light array of current time LED module composition.

The present invention solves another technical scheme that its technical problem adopts:

For a control method for the LED light source of NI Vision Builder for Automated Inspection, comprising:

S1, in real time employing elevation carrection sensor gather the distance value of LED light source distance shadow surface;

S2, the distance value gathered according to elevation carrection sensor calculate the optimal illumination radius of the sphere shape light array of LED module composition;

After the illumination radius of the sphere shape light array of S3, acquisition current time LED module composition, calculate the moving displacement obtaining LED module;

S4, control the action of multiple drive disk assembly according to calculating the moving displacement obtained thus drive LED module to move.

Further, described step S2, it is specially:

In conjunction with following formula, the distance value gathered according to elevation carrection sensor calculates the optimal illumination radius of the sphere shape light array of LED module composition:

$r_1=\sqrt{\frac{2}{m+3}}h$

In above formula, h represents the distance value that elevation carrection sensor gathers, r ¹represent the optimal illumination radius of the sphere shape light array of current time LED module composition, m represents the coefficient relevant to the characteristics of luminescence of LED module.

Further, described step S3, it is specially:

After obtaining the initial illumination radius of the sphere shape light array of LED module composition, calculate the moving displacement r obtaining LED module according to following formula:

r＝r ₁-r ₀

In above formula, r ₁represent the optimal illumination radius of the sphere shape light array of current time LED module composition, r ⁰represent the illumination radius of the sphere shape light array of current time LED module composition.

The invention has the beneficial effects as follows: a kind of LED light source for NI Vision Builder for Automated Inspection of the present invention, comprise annular bottom plate, single-chip microcomputer and the elevation carrection sensor for the distance value that gathers LED light source and shadow surface, described annular bottom plate is provided with equably multiple conveyor track radially, described conveyor track is provided with LED module and for driving LED module along the drive disk assembly of conveyor track movement, described elevation carrection sensor is arranged on the side of annular bottom plate, the radius of the action that the distance value that described single-chip microcomputer is used for gathering according to elevation carrection sensor controls multiple drive disk assembly and then the sphere shape light array that regulates multiple LED module to form.This LED light source by gather LED light source and shadow surface distance value after, control the action of drive disk assembly thus the radius of the sphere shape light array regulating multiple LED module to form, thus when the direction and the differing heights illumination that change incident ray, also can realize Uniform Illumination, NI Vision Builder for Automated Inspection can be made to collect the good image of visual effect.This LED light source structure is simple and easy to adjust.

In addition, each LED module of this LED light source is equipped with diffused reflector, and light can be made more even in spatial distribution, radiation response evenly.

Another beneficial effect of the present invention is: a kind of control method of the LED light source for NI Vision Builder for Automated Inspection, comprising: S1, in real time employing elevation carrection sensor gather the distance value of LED light source distance shadow surface; S2, the distance value gathered according to elevation carrection sensor calculate the optimal illumination radius of the sphere shape light array of LED module composition; After the illumination radius of the sphere shape light array of S3, acquisition current time LED module composition, calculate the moving displacement obtaining LED module; S4, control the action of multiple drive disk assembly according to calculating the moving displacement obtained thus drive LED module to move.This control method by gather LED light source and shadow surface distance value after, control the action of drive disk assembly thus the radius of the sphere shape light array regulating multiple LED module to form, thus when the direction and the differing heights illumination that change incident ray, also can realize Uniform Illumination, NI Vision Builder for Automated Inspection can be made to collect the good image of visual effect.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described.

Fig. 1 is the first perspective view of a kind of LED light source for NI Vision Builder for Automated Inspection of the present invention;

Fig. 2 is the second perspective view of a kind of LED light source for NI Vision Builder for Automated Inspection of the present invention;

Fig. 3 is the internal structure schematic diagram of a kind of LED light source for NI Vision Builder for Automated Inspection of the present invention;

Fig. 4 is the structural representation of the shell of a kind of LED light source for NI Vision Builder for Automated Inspection of the present invention;

Fig. 5 is the schematic diagram of the cartesian coordinate system that a specific embodiment of the present invention is set up;

Fig. 6 is when in a specific embodiment of the present invention, LED light source illuminator level is 140mm, the Illumination Distribution figure of shadow surface;

Fig. 7 is the illumination curve figure at the straight line x=0 place in Fig. 6.

Detailed description of the invention

See figures.1.and.2, the invention provides a kind of LED light source for NI Vision Builder for Automated Inspection, comprise annular bottom plate 1, single-chip microcomputer and the elevation carrection sensor 21 for the distance value that gathers LED light source and shadow surface, described annular bottom plate 1 is provided with equably multiple conveyor track 16 radially, described conveyor track 16 is provided with LED module and for driving LED module along the drive disk assembly of conveyor track 16 movement, described elevation carrection sensor 21 is arranged on the side of annular bottom plate 1, the radius of the action that the distance value that described single-chip microcomputer is used for gathering according to elevation carrection sensor 21 controls multiple drive disk assembly and then the sphere shape light array that regulates multiple LED module to form.

Be further used as preferred embodiment, with reference to Fig. 3, described annular bottom plate 1 is provided with fixed supporting seat 2 at the end at the center of the close annular bottom plate 1 of each conveyor track 16, described drive disk assembly is connected with fixed supporting seat 2, described drive disk assembly comprises motor 11, motor supporting base 13, shaft coupling 10, screw mandrel 9, slider track 3 and the slide block 4 that can slide on slider track 3, described motor supporting base 13 and slider track 3 are installed on annular bottom plate 1, described motor 11 is arranged on motor supporting base 13, one end of described screw mandrel 9 is connected with motor 11 by shaft coupling 10, the other end of described screw mandrel 9 is connected with fixed supporting seat 2, described slide block 4 is set on screw mandrel 9, described LED module is connected with slide block 4, connect with single-chip microcomputer in parallel between the motor 11 of multiple drive disk assembly and move consistent.

Be further used as preferred embodiment, the both sides of described slide block 4 are equipped with the pulley 5 for sliding on slider track 3 with movable slider 4.

Be further used as preferred embodiment, described annular bottom plate 1 is all provided with for carrying out spacing travel switch 20 to slide block 4 in the below at the two ends of each screw mandrel 9.

Be further used as preferred embodiment, described LED module comprises LED-baseplate 6, LED rectangular array 8 and diffused reflector 14, and described LED rectangular array 8 and diffused reflector 14 are arranged in LED-baseplate 6 successively, and described LED-baseplate 6 is inverted and is arranged on drive disk assembly.

Be further used as preferred embodiment, with reference to Fig. 4, also comprise shell 17, described shell 17 is just being provided with the centre bore 18 with this central opening same size to the position of the central opening of annular bottom plate 1.

Be further used as preferred embodiment, the radius of the sphere shape light array that described single-chip microcomputer regulates multiple LED module to form according to following formula:

$r=\sqrt{\frac{2}{m+3}}h-r_0$

In above formula, r represents the regulated value of the radius of the sphere shape light array that multiple LED module forms, and h represents the distance value that elevation carrection sensor 21 gathers, r ¹represent the optimal illumination radius of the sphere shape light array of current time LED module composition, m represents the coefficient relevant to the characteristics of luminescence of LED module, r ₀represent the illumination radius of the sphere shape light array of current time LED module composition.

Present invention also offers a kind of control method of the LED light source for NI Vision Builder for Automated Inspection, comprising:

S1, in real time employing elevation carrection sensor 21 gather the distance value of LED light source distance shadow surface;

S2, the distance value gathered according to elevation carrection sensor 21 calculate the optimal illumination radius of the sphere shape light array of LED module composition;

After the illumination radius of the sphere shape light array of S3, acquisition current time LED module composition, calculate the moving displacement obtaining LED module;

S4, control the action of multiple drive disk assembly according to calculating the moving displacement obtained thus drive LED module to move.

Be further used as preferred embodiment, described step S2, it is specially:

In conjunction with following formula, the distance value gathered according to elevation carrection sensor 21 calculates the optimal illumination radius of the sphere shape light array of LED module composition:

$r_1=\sqrt{\frac{2}{m+3}}h$

In above formula, h represents the distance value that elevation carrection sensor 21 gathers, r ¹represent the optimal illumination radius of the sphere shape light array of current time LED module composition, m represents the coefficient relevant to the characteristics of luminescence of LED module.

Be further used as preferred embodiment, described step S3, it is specially:

After obtaining the initial illumination radius of the sphere shape light array of LED module composition, calculate the moving displacement r obtaining LED module according to following formula:

r＝r ₁-r ₀

In above formula, r ₁represent the optimal illumination radius of the sphere shape light array of current time LED module composition, r ⁰represent the illumination radius of the sphere shape light array of current time LED module composition.

Below in conjunction with specific embodiment, the invention will be further described.

Embodiment one

Referring to figs. 1 through Fig. 4, a kind of LED light source for NI Vision Builder for Automated Inspection, comprise annular bottom plate 1, single-chip microcomputer and the elevation carrection sensor 21 for the distance value that gathers LED light source and shadow surface, annular bottom plate 1 is provided with equably multiple conveyor track 16 radially, conveyor track 16 is provided with LED module and for driving LED module along the drive disk assembly of conveyor track 16 movement, elevation carrection sensor 21 is arranged on the side of annular bottom plate 1, the radius of the action that the distance value that single-chip microcomputer is used for gathering according to elevation carrection sensor 21 controls multiple drive disk assembly and then the sphere shape light array that regulates multiple LED module to form.Multiple LED module to be centrosymmetric distribution about the center of annular bottom plate 1.LED module of the present invention can move along conveyor track 16 under the drive of drive disk assembly, therefore the radius of this LED light source is adjustable, the radius of the annular array that can LED module be regulated under the lighting environment of differing heights to form, thus while meeting the lighting requirement of differing heights, Uniform Illumination can be realized in the same old way.

In the present embodiment, the quantity of conveyor track 16 is even number.As shown in Figure 2, conveyor track 16 radially refers to that each conveyor track 16 was distributed on a straight line at the center of annular bottom plate 1 respectively, and all conveyor track 16 can be regarded as and are evenly distributed on circular multiple radiuses.

It is noted that Fig. 1 is the simple perspective view of this LED light source, mainly show the relation between annular bottom plate 1, conveyor track 16, do not limit the form of implementation of detailed drive disk assembly and LED module.Fig. 3 illustrates the drive disk assembly of the present embodiment and a kind of implementation of LED module, annular bottom plate 1 is provided with fixed supporting seat 2 at the end at the center of the close annular bottom plate 1 of each conveyor track 16, drive disk assembly is connected with fixed supporting seat 2, drive disk assembly comprises motor 11, motor supporting base 13, shaft coupling 10, screw mandrel 9, slider track 3 and the slide block 4 that can slide on slider track 3, motor supporting base 13 is fixed on annular bottom plate 1 by connector, slider track 3 is arranged on annular bottom plate 1, motor 11 is arranged on motor supporting base 13 by screw 12, one end of screw mandrel 9 is connected with motor 11 by shaft coupling 10, the other end of screw mandrel 9 is connected with fixed supporting seat 2, slide block 4 is set on screw mandrel 9, LED module is connected by screw 7 with slide block 4, connect with single-chip microcomputer in parallel between the motor 11 of multiple drive disk assembly and move consistent, thus make LED module can keep uniform annular array, maintain uniform illumination.

Preferably, the both sides of slide block 4 are equipped with the pulley 5 for sliding on slider track 3 with movable slider 4.Slide block 4 is connected by screw 19 with pulley 5, pulley 5 is the frictional force in order to reduce slide block 4 movement, the pulley 5 of slide block 4 both sides coordinates with slider track 3, realize slidably reciprocating of slide block 4, thus drive the motion of LED module, thus make under the lighting environment of differing heights, by the diameter regulating the motion of LED module to regulate this LED light source, thus Uniform Illumination can be realized.In order to show other assembly of LED light source in Fig. 1 and Fig. 3, only depict a slider track 3, in fact, the quantity of slider track 3 is two, be distributed in the two ends of screw mandrel 9 symmetrically, slide block 4 slidably reciprocates under the pulley 5 of both sides and the cooperation of slider track 3 on leading screw 9.

Preferably, annular bottom plate 1 is all provided with in the below at the two ends of each screw mandrel 9 for carrying out spacing travel switch 20 to slide block 4, and travel switch 20 displacement of anti-limited slip block 4 can exceed stroke range.

LED module is the illumination module be made up of LED, and in the present embodiment, LED module comprises LED-baseplate 6, LED rectangular array 8 and diffused reflector 14, LED rectangular array 8 and diffused reflector 14 is arranged in LED-baseplate 6 successively, and LED-baseplate 6 is inverted and is arranged on drive disk assembly.In detail, diffused reflector 14 is arranged in LED-baseplate 6 by chock 15.The LED module of this LED light source is in a state of use towards irradiation, and " LED-baseplate 6 is inverted and is arranged on drive disk assembly " what describe is this LED light source installation situation in a state of use.The light that diffused reflector 14 can make LED rectangular array send is more even in spatial distribution, make radiation response evenly.

This LED light source also comprises shell 17, and shell 17 is just being provided with the centre bore 18 with this central opening same size to the position of the central opening of annular bottom plate 1.Centre bore 18 is as the entrance of NI Vision Builder for Automated Inspection camera acquisition image, and IMAQ is carried out in the below that video camera reaches this LED light source through centre bore 18.

In actual use, the LED light source of the present embodiment is also provided with the shift knob of the duty of control LED module, and for the play button that the radius of control single chip computer to the sphere shape light array of LED power regulates, as follows to the concrete operation step of this LED light source:

Step 1, is fixed on the IMAQ end of Machine Vision Inspecting System by this LED light source, and makes the axle center of the video camera of IMAQ end and light source center perforate to the heart.

Step 2, detects the scope of feature as required, this LED light source is adjusted to the height of adaptation.

Step 3, presses shift knob, and LED module works; Press play button, elevation carrection sensor 21 detects shadow surface height, and by Single-chip Controlling, automatically regulate the radius of the sphere shape light array of LED module composition, light source life's work, video camera starts to gather image.

Step 4, when light source irradiation height changes, after regulating light source height, then presses play button, readjusts the radius of the sphere shape light array of LED module composition.

Step 5, when system works is complete, presses SR, makes the position of LED module restore initial position, then presses shift knob, close light source.

In step 3 and step 4, single-chip microcomputer regulates the radius of the sphere shape light array of LED module composition, carries out according to following formula:

$r=\sqrt{\frac{2}{m+3}}h-r_0$

In above formula, r represents the regulated value of the radius of the sphere shape light array that multiple LED module forms, and h represents the distance value that elevation carrection sensor 21 gathers, r ¹represent the optimal illumination radius of the sphere shape light array of current time LED module composition, m represents the coefficient relevant to the characteristics of luminescence of LED module, r ⁰represent the illumination radius of the sphere shape light array of current time LED module composition.

Embodiment two

For a control method for the LED light source of NI Vision Builder for Automated Inspection, comprising:

S1, in real time employing elevation carrection sensor 21 gather the distance value of LED light source distance shadow surface;

S2, the distance value gathered according to elevation carrection sensor 21 calculate the optimal illumination radius of the sphere shape light array of LED module composition;

After the illumination radius of the sphere shape light array of S3, acquisition current time LED module composition, calculate the moving displacement obtaining LED module;

S4, control the action of multiple drive disk assembly according to calculating the moving displacement obtained thus drive LED module to move.

In the present embodiment, step S2 is specially:

In conjunction with following formula, the distance value gathered according to elevation carrection sensor 21 calculates the optimal illumination radius of the sphere shape light array of LED module composition:

$r_1=\sqrt{\frac{2}{m+3}}h$

In above formula, h represents the distance value that elevation carrection sensor 21 gathers, r ¹represent the optimal illumination radius of the sphere shape light array of current time LED module composition, m represents the coefficient relevant to the characteristics of luminescence of LED module.

In the present embodiment, step S3 is specially:

After obtaining the initial illumination radius of the sphere shape light array of LED module composition, calculate the moving displacement r obtaining LED module according to following formula:

r＝r ₁-r ₀

In above formula, r ₁represent the optimal illumination radius of the sphere shape light array of current time LED module composition, r ₀represent the illumination radius of the sphere shape light array of current time LED module composition.

Detailed, the detailed description of the invention of drive disk assembly in composition graphs 3, if screw mandrel 9 pitch is p, every M the pulse rotary of motor 11 turns around, and require that speed is N circle/second, then pulse frequency is MHz, and the pulse period is then calculate in step s3 after obtaining moving displacement r, the umber of pulse that MCU driving motor 11 needs is $A=\frac{r}{p}\·M.$

The present embodiment carries out radius adjustment principle to LED light source is below described:

The LED light source of embodiment one belongs to direct illumination light source.Direct illumination mainly for the illumination of the convex and concave feature of workpiece, in order to highlight need detect feature, such as plateau, blind hole etc.The annular light source fixed form often of current direct illumination on the market.This fixed form light source, when differing heights throws light on, often makes the center illumination of shadow surface higher or on the low side, is difficult to realize Uniform Illumination.And the LED light source of the present embodiment, can the radius of sphere shape light array of control LED module composition, when realizing differing heights illumination, also can obtain the more uniform visual effect of illumination.Its principle is exactly that the first order derivative of illumination curve at the center of shadow surface that meet shadow surface and second derivative are respectively zero.As shown in Figure 5, with the center of shadow surface for the origin of coordinates, set up cartesian coordinate system (x, y, z).Then illumination formula E (x, y) of shadow surface is for shown in formula (1).

$E(x,y)=\mathrm{\Σ}\frac{I_0{\cos }^m\mathrm{\θ}\·\cos \mathrm{\θ}}{d^2}=\mathrm{\Σ}{I}_0{h}^{m+1}{({(x-x_i)}^2+{(y-y_i)}^2+h^2)}^{-\frac{m+3}{2}}---\left(1\right)$

Wherein, I ₀for LED normal luminous intensity degree, m represents the coefficient relevant to the characteristics of luminescence of LED module, and θ represents the angle of arbitrary center of LED module and the line of initial point and its normal, and d represents arbitrary center of LED module and the distance of initial point, (x _i, y _i, be h) the centre coordinate value of LED module, wherein h represents light illumination height.Because LED module constitutes sphere shape light array, and matrix number is even number.If the number of LED module is N, then the centre coordinate value of n-th group of LED module can be wherein l is the radius of the sphere shape light array of LED module composition.Then formula (1) can turn to formula (2), as follows.

$E(x,y)=\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}{I}_0{h}^{m+1}{[{(x-l\cos \frac{2\mathrm{\πn}}{N})}^2+{(y-l\sin \frac{2\mathrm{\πn}}{N})}^2+h^2]}^{-(m+3)/2}---\left(2\right)$

To obtain uniform illuminating effect, according to described requirement above, formula (3), (4) should be met.Because N is even number, so formula (3) perseverance meets.So can be obtained by formula (4), obtain uniform illuminating effect, the circular radius l of illuminator level h and LED module should meet function formula (5).

$\frac{\mathrm{dE}}{\mathrm{dx}}=0{|}_{x=0,y=0}---\left(3\right)$

$\frac{d^{2}E}{{\mathrm{dx}}^2}=0{|}_{x=0,y=0}---\left(4\right)$

$f(l,h)=l-\sqrt{\frac{2}{m+3}}h=0---\left(5\right)$

The functional relation of formula (5) the i.e. circular radius l of illuminator level h and LED module.While changing incident ray direction by the height changing light source, and with the circular radius l of the LED module matched to reach the illuminating effect of uniform irradiation.Figure of description 6 is NI Vision Builder for Automated Inspection LED light source illuminator level of the present invention is 140mm, the Illumination Distribution figure of shadow surface.Fig. 7 is the illumination curve at Fig. 6 cathetus x=0 place, can find out by figure, and the uniformity being in 100mm ~-100mm scope is 86% (minimal illumination is divided by maximal illumination).

More than that better enforcement of the present invention is illustrated, but the invention is not limited to embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.

Claims (10)

1. the LED light source for NI Vision Builder for Automated Inspection, it is characterized in that, comprise annular bottom plate (1), single-chip microcomputer and the elevation carrection sensor (21) for the distance value that gathers LED light source and shadow surface, described annular bottom plate (1) is provided with equably multiple conveyor track (16) radially, described conveyor track (16) is provided with LED module and for driving LED module along the drive disk assembly of conveyor track (16) movement, described elevation carrection sensor (21) is arranged on the side of annular bottom plate (1), the radius of the action that the distance value that described single-chip microcomputer is used for gathering according to elevation carrection sensor (21) controls multiple drive disk assembly and then the sphere shape light array that regulates multiple LED module to form.

2. a kind of LED light source for NI Vision Builder for Automated Inspection according to claim 1, it is characterized in that, described annular bottom plate (1) is provided with fixed supporting seat (2) at the end at the center of the close annular bottom plate (1) of each conveyor track (16), described drive disk assembly is connected with fixed supporting seat (2), described drive disk assembly comprises motor (11), motor supporting base (13), shaft coupling (10), screw mandrel (9), slider track (3) and the slide block (4) that above can slide at slider track (3), described motor supporting base (13) and slider track (3) are installed on annular bottom plate (1), described motor (11) is arranged on motor supporting base (13), one end of described screw mandrel (9) is connected with motor (11) by shaft coupling (10), the other end of described screw mandrel (9) is connected with fixed supporting seat (2), described slide block (4) is set on screw mandrel (9), described LED module is connected with slide block (4), connect with single-chip microcomputer in parallel between the motor (11) of multiple drive disk assembly and move consistent.

3. a kind of LED light source for NI Vision Builder for Automated Inspection according to claim 2, it is characterized in that, the both sides of described slide block (4) are equipped with the pulley (5) for above sliding at slider track (3) with movable slider (4).

4. a kind of LED light source for NI Vision Builder for Automated Inspection according to claim 2, it is characterized in that, described annular bottom plate (1) is all provided with in the below at the two ends of each screw mandrel (9) for carrying out spacing travel switch (20) to slide block (4).

5. a kind of LED light source for NI Vision Builder for Automated Inspection according to claim 1, it is characterized in that, described LED module comprises LED-baseplate (6), LED rectangular array (8) and diffused reflector (14), described LED rectangular array (8) and diffused reflector (14) are arranged in LED-baseplate (6) successively, and described LED-baseplate (6) is inverted and is arranged on drive disk assembly.

6. a kind of LED light source for NI Vision Builder for Automated Inspection according to any one of claim 1 to 5, it is characterized in that, also comprise shell (17), described shell (17) is just being provided with and the centre bore of this central opening same size (18) the position of the central opening of annular bottom plate (1).

7. a kind of LED light source for NI Vision Builder for Automated Inspection according to any one of claim 1 to 5, is characterized in that, the radius of the sphere shape light array that described single-chip microcomputer regulates multiple LED module to form according to following formula:

$r=\sqrt{\frac{2}{m+3}}h-r_0$

In above formula, r represents the regulated value of the radius of the sphere shape light array that multiple LED module forms, and h represents the distance value that elevation carrection sensor (21) gathers, r ₁represent the optimal illumination radius of the sphere shape light array of current time LED module composition, m represents the coefficient relevant to the characteristics of luminescence of LED module, r ₀represent the illumination radius of the sphere shape light array of current time LED module composition.

8. for a control method for the LED light source of NI Vision Builder for Automated Inspection, it is characterized in that, comprising:

S1, in real time employing elevation carrection sensor (21) gather the distance value of LED light source distance shadow surface;

S2, the distance value gathered according to elevation carrection sensor (21) calculate the optimal illumination radius of the sphere shape light array of LED module composition;

After the illumination radius of the sphere shape light array of S3, acquisition current time LED module composition, calculate the moving displacement obtaining LED module;

S4, control the action of multiple drive disk assembly according to calculating the moving displacement obtained thus drive LED module to move.

9. the control method of a kind of LED light source for NI Vision Builder for Automated Inspection according to claim 8, it is characterized in that, described step S2, it is specially:

In conjunction with following formula, the distance value gathered according to elevation carrection sensor (21) calculates the optimal illumination radius of the sphere shape light array of LED module composition:

$r_1=\sqrt{\frac{2}{m+3}}h$

In above formula, h represents the distance value that elevation carrection sensor (21) gathers, r ₁represent the optimal illumination radius of the sphere shape light array of current time LED module composition, m represents the coefficient relevant to the characteristics of luminescence of LED module.

10. the control method of a kind of LED light source for NI Vision Builder for Automated Inspection according to claim 9, it is characterized in that, described step S3, it is specially:

After obtaining the initial illumination radius of the sphere shape light array of LED module composition, calculate the moving displacement r obtaining LED module according to following formula:

r＝r ₁-r ₀

In above formula, r ₁represent the optimal illumination radius of the sphere shape light array of current time LED module composition, r ₀represent the illumination radius of the sphere shape light array of current time LED module composition.