CN112255174A - Co-frequency confocal LED illumination light source structure for detecting three-dimensional defects on surface of product - Google Patents

Co-frequency confocal LED illumination light source structure for detecting three-dimensional defects on surface of product Download PDF

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Publication number
CN112255174A
CN112255174A CN202011167868.2A CN202011167868A CN112255174A CN 112255174 A CN112255174 A CN 112255174A CN 202011167868 A CN202011167868 A CN 202011167868A CN 112255174 A CN112255174 A CN 112255174A
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China
Prior art keywords
led lamp
light source
led
lamp bead
illumination light
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CN202011167868.2A
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周维
郑步笑
徐存辉
陈立新
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Jiangsu Shanguoyuan Intelligent Technology Co ltd
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Jiangsu Shanguoyuan Intelligent Technology Co ltd
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Priority to CN202011167868.2A priority Critical patent/CN112255174A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2518—Projection by scanning of the object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N2021/0106—General arrangement of respective parts
    • G01N2021/0112—Apparatus in one mechanical, optical or electronic block

Abstract

The invention discloses a same-frequency confocal LED illuminating light source structure for detecting three-dimensional defects on the surface of a product, which has high fixing reliability with a lens component, is convenient to adjust the illuminating focal length of the LED illuminating light source, instantly lights LED lamp beads, can overload and remarkably improve the brightness, and is synchronously and sequentially lighted with pixels of a linear array CCD sensor, greatly saves energy consumption and prolongs the service life while meeting the illuminating requirement, greatly improves the accuracy of detecting and sampling the surface of the product (especially textiles) by optically realizing the working process of confocal, is convenient to provide accurate original data for subsequent image processing analysis so as to be matched with the use of sampling of the CCD sensor, has convenient control, does not need to be matched with a heat dissipation unit, can overload and light the instantly lighted LED lamp beads, does not influence the service life, and can finish the heat dissipation requirement through an aluminum circuit substrate, the design is ingenious, the conception is novel, and the method has a good application prospect.

Description

Co-frequency confocal LED illumination light source structure for detecting three-dimensional defects on surface of product
Technical Field
The invention relates to the technical field of product surfaces, in particular to a common-frequency confocal LED illumination light source structure for detecting three-dimensional defects on the product surface.
Background
CCD sensor, made of a semiconductor material with high light sensitivity, can convert light into electric charge, and convert the electric charge into digital signals through an analog-to-digital converter, and the digital signals are processed by a computer. At present, CCD sensors are widely applied to the surface flaw detection of industrial products. In particular to the detection of various defects on the surface of a product.
In the detection process of the surface defects (with high precision requirement) of the product, the sampling environment is very important, and reliable and high-precision data must be provided for the subsequent image processing process so as to obtain an accurate defect detection result.
The defects on the surface of the product are divided into three-dimensional defects and two-dimensional defects according to different types of the defects on the surface of the product, wherein the three-dimensional defects comprise three-dimensional layer defects such as bulges, depressions and the like on the surface of the product and defects presented in a three-dimensional space; in the prior art, a sampling environment is very important in the detection process of three-dimensional defects on the surface of a product, and the three-dimensional defects can be displayed only by a parallel light source (obliquely irradiating the three-dimensional defects), so that the requirement on sampling illumination of the three-dimensional defects is much higher than that of two-dimensional defects, and for the three-dimensional defects on the surface of the product, if sampling data is inaccurate, the precision of a subsequent image processing method is high, and accurate detection of the three-dimensional defects on the surface of the product cannot be obtained.
At present, in CCD sensor scanning sample process, the luminance and the stability of illumination source directly influence the dynamic range and the precision of CCD sensor scanning sample, and illumination source's luminance is high and stability is good, then can acquire more accurate sample data, wideer dynamic range to adapt to more sample types. At present, the lighting source is mostly an LED lighting source, and the improvement of illumination brightness is greatly limited by the heat dissipation capacity of the LED lighting source. For the product surface detection equipment in work, the installation space of the illumination light source is limited, and in practice, the LED illumination light source which is too large and too heavy is often difficult to apply. Moreover, the shaking generated during the operation of the device can affect the stability of illumination, thereby affecting the dynamic range and precision of the scanning and sampling of the CCD sensor.
Therefore, how to construct a common-frequency confocal LED illumination light source structure for detecting three-dimensional defects on the surface of a product according to the scanning and sampling operating characteristics of a CCD sensor is a problem that needs to be solved currently, which can reduce the volume of the product and ensure the good and stable operation of the product so as to improve the scanning and sampling accuracy of the CCD sensor.
Disclosure of Invention
The invention aims to solve the problems of insufficient bright points of an illumination light source and poor heat dissipation in the scanning and sampling process of the existing CCD sensor. The co-frequency confocal LED illumination light source structure for detecting the three-dimensional defects on the surface of the product has the advantages that the reliability of fixation with a lens component is high, the illumination focal length of the LED illumination light source is convenient to adjust, the LED lamp beads are instantly lightened, the overload can be realized, the brightness is obviously improved, the co-frequency confocal LED illumination light source structure and the pixels of the linear array CCD sensor are synchronously and sequentially lightened, the illumination requirement is met, the energy consumption is greatly saved, the service life is prolonged, the co-frequency confocal LED illumination light source is selected to illuminate according to the attribute characteristics of the three-dimensional defects on the surface of the product, the projection imaging detection of the three-dimensional defects (including three-dimensional layer defects such as bulges and depressions) is convenient, the overall stability is high, the accuracy of detection and sampling of the three-dimensional defects on the.
In order to achieve the purpose, the invention adopts the technical scheme that:
a common-frequency confocal LED illuminating light source structure for detecting three-dimensional defects on the surface of a product comprises a sampling lens component, an LED illuminating light source component and an adjustable illuminating position bracket,
the LED illuminating light source component is arranged at the rear end part of the sampling lens component through the adjustable illuminating position bracket,
the LED illuminating light source assembly is a co-focusing LED illuminating light source with the same frequency, LED illuminating lamp beads in the LED illuminating light source assembly can be controlled to be turned on or turned off in a single-point mode, the LED illuminating light source assembly is evenly divided into a plurality of subarea LED lamp bead units according to the position sequence, the subarea LED lamp bead units are turned on or turned off in sequence according to the clock frequency of sequential exposure of pixels of the linear array CCD sensor along the working direction, and the LED illuminating light source assembly and the linear array CCD sensor are enabled to complete synchronous work with;
the LED illuminating light source assembly can adjust the positions of the LED illuminating light source assembly in the left and right directions through the adjustable illuminating position support, so that the illuminating focusing point of an LED lamp bead in the LED illuminating light source assembly and the sampling focusing point of the linear array CCD sensor pixel point are located at the same position, and the confocal work is realized.
The common-frequency confocal LED illuminating light source structure for detecting three-dimensional defects on the surface of a product comprises an aluminum circuit substrate, an LED lamp bead strip is arranged in the middle of the aluminum circuit substrate, a plurality of LED lamp beads are distributed in sequence at equal intervals, an anode power supply wiring terminal row is arranged on the aluminum circuit substrate on one side of the LED lamp bead strip, a cathode power supply wiring terminal row is arranged on the aluminum circuit substrate on the other side of the LED lamp bead strip, the anode power supply wiring terminal row and the cathode power supply wiring terminal row are arranged opposite to each other, the anode of each LED lamp bead in the LED lamp bead strip is connected with a wiring terminal of the anode power supply wiring terminal row in sequence, the cathode of each LED lamp bead in the LED lamp bead strip is connected with a wiring terminal of the cathode power supply wiring terminal row in sequence, and point single control of the LED lamp beads in the LED lamp bead strip is realized by controlling power supply at the corresponding positions of the anode power supply wiring terminal row In the preparation method, the raw materials are mixed,
LED lamp beads in the LED lamp bead strips are evenly divided into a plurality of partitioned LED lamp bead units according to the position sequence, and fixed mounting holes are formed in the periphery of the aluminum circuit substrate and are mounted on the adjustable lighting position support through the fixed mounting holes.
In the co-focusing LED illumination light source structure with the same frequency for detecting the three-dimensional defects on the surface of the product, the adjustable illumination position support comprises a front-end lens lantern ring, a middle support sheet and a rear-end illumination light source connecting seat,
the utility model discloses a LED lighting source adjusting device, including front end lens lantern ring, middle backing sheet and rear end lighting source connecting seat, front end lens lantern ring, middle backing sheet and rear end lighting source connecting seat distribute from front to back in proper order, and through the connecting guide arm through connection that is located the four corners, front end lens lantern ring cup joints in the outside of sampling lens subassembly, middle backing sheet is located the rear end department of sampling lens subassembly, and is provided with first light source irradiation hole, the LED lighting source adjusting base who is used for realizing that LED lighting source subassembly controls regulatory function is installed to the rear end of rear end lighting source connecting seat, rear end lighting source connecting seat is provided with second light source irradiation hole, LED lighting source adjusting base is provided with third light.
According to the common-frequency confocal LED illumination light source structure for detecting the three-dimensional defects on the surface of the product, the middle support sheet and the rear-end illumination light source connecting seat are made of gold-plated brass.
The co-frequency confocal LED lighting source structure for detecting three-dimensional defects on the surface of a product comprises an adjusting base plate, two sides of the adjusting base plate are perpendicularly bent towards the rear end to form a guiding side plate, a left moving guide rod and a right moving guide rod penetrating through the guiding side plates at the two sides are mounted behind the adjusting base plate, the left moving guide rod and the right moving guide rod are oppositely arranged, a left moving threaded sleeve which is rotatably screwed is sleeved on the left moving guide rod, a right moving threaded sleeve which is rotatably screwed is sleeved on the right moving guide rod, a movable left slider is fixed on each of two sides of the left moving threaded sleeve, a movable right slider is fixed on each of two sides of the right moving threaded sleeve, and four corners of an aluminum circuit substrate are respectively fixed on the left slider and the right slider at corresponding positions through fixed guide posts,
the left moving guide rod and the right moving guide rod can drive the left moving threaded sleeve and the right moving threaded sleeve to move respectively in the rotating process, the left moving threaded sleeve or the right moving threaded sleeve moves to realize the movement of the left position and the right position of an aluminum circuit substrate, the lighting focusing point of the LED lamp beads and the sampling focusing point of the pixel point of the linear array CCD sensor are located at the same position, and the confocal work is realized.
In the common-frequency confocal LED illumination light source structure for detecting three-dimensional defects on the surface of a product, the anode power supply terminal block and the cathode power supply terminal block each include a plurality of groups of terminal block unit blocks distributed at intervals; the distance L1 between the LED lamp beads is 0.15mm, and the width L2 of the LED lamp beads is 0.33 mm; the rated voltage of the LED lamp bead is 3V, the rated probability is 0.45w, and the LED lamp bead is overloaded to 11V and 4A by instantaneous lighting.
In the common-frequency confocal LED illumination light source structure for detecting three-dimensional defects on the surface of a product, the rotating ends of the left moving guide rod and the right moving guide rod are provided with the linear nuts which are convenient to rotate.
The same-frequency confocal LED illumination light source structure for detecting three-dimensional defects on the surface of a product is characterized in that f is set as the working frequency of a single pixel of a linear array CCD sensor, the width of each pixel is i, the magnification of a scanning optical system is 1/X, the corresponding width of each pixel on an object image is i.X, the magnification of a lens is 1/Y, the width of a single LED lamp bead unit plus two LED lamp bead units is S, the object image range S = s.Y required to be illuminated by the single LED lamp bead unit is S/i.X pixels when being illuminated on the linear array CCD sensor, the time T1= S.f/i.X required to be illuminated by each LED lamp bead unit, the time T2 of the overlapped electric quantity of adjacent LED lamp bead units is at least 1/f and less than 2/f, and X, Y is a characteristic parameter of a sampling lens assembly.
According to the common-frequency confocal LED illumination light source structure for detecting the three-dimensional defects on the surface of the product, one or more LED lamp beads are arranged in the LED lamp bead unit.
According to the co-focusing LED illumination light source structure with the same frequency for detecting the three-dimensional defects on the surface of the product, the LED lamp beads can be singly turned on or turned off, the LED lamp beads are distributed at odd and even field intervals, anodes of odd LED lamp beads are controlled by the power supply a, the power supply a is a signal Pa array, anodes of even LED lamp beads are controlled by the power supply b, and the power supply b is a signal Pb array.
The invention has the beneficial effects that: the co-frequency confocal LED illumination light source structure for detecting the three-dimensional defects on the surface of the product has high reliability when being fixed with a lens component, is convenient to adjust the illumination focal length of the LED illumination light source, instantly lights the LED lamp beads, can be overloaded, has obviously improved brightness, and is synchronously and sequentially lighted with the pixels of a linear array CCD sensor, the co-frequency confocal LED illumination light source is selected to illuminate according to the attribute characteristics of the three-dimensional defects on the surface of the product, is convenient for the projection imaging detection of the three-dimensional defects (including three-dimensional layer defects such as bulges, pits, and the like), the LED illumination light source can instantly light the LED lamp beads, the LED illumination light source can be singly lighted, the LED lamp beads at the corresponding positions are lighted by mapping control according to the working characteristic, the LED lamp beads are instantly lighted, the overload can be realized, the brightness is obviously improved, and the actual power consumption is low, the heat productivity is small, and an active part is not needed, whole small, the on-the-spot installation of the product surface detection of being convenient for, be applicable to various industrial environment, and light in proper order in step with CCD sensor's pixel, when satisfying the lighting demand, very big saving energy consumption, the life-span is prolonged, and the working process of confocal (to three-dimensional fault) is realized through the optics principle, improve the accuracy of the three-dimensional fault detection sample in product surface greatly, and can accomplish radiating demand through aluminium system circuit substrate, the illuminating effect is good, the radiating efficiency is high, the overall stability is high, and ingenious design, novel design, and good application prospect has.
Drawings
FIG. 1 is a schematic structural diagram of a co-frequency confocal LED illumination light source structure for detecting three-dimensional defects on the surface of a product according to the present invention;
FIG. 2 is a first side view of a confocal LED illumination source structure with same frequency for detecting defects on the surface of a product according to the present invention;
FIG. 3 is a second side view of the co-frequency confocal LED illumination light source structure for detecting three-dimensional defects on the surface of a product according to the present invention;
FIG. 4 is a schematic diagram of the structure of the LED illumination light source assembly of the present invention;
fig. 5 is a schematic structural view of an LED bead strip of an LED of the present invention.
The designations in the drawings have the following meanings:
1: a sampling lens assembly; 2: an LED illumination light source assembly; 201: an aluminum circuit board; 202: LED light bead strips; 2021: LED lamp beads; 203: an anode power supply terminal block; 204: a cathode power supply terminal block; 205: fixing the mounting hole; 206: fixing the guide post; 3: an adjustable illumination position bracket; 301: a front end lens collar; 302: an intermediate support sheet; 3021: a first light source irradiation hole; 3031: a second light source irradiation hole; 303: connecting the guide rod; 304: a rear end illumination light source connecting seat; 3041: a third light source irradiation hole; 3042: an adjustment base plate; 3043: a guide side plate; 3044: moving the guide bar to the left; 3045: moving the guide bar to the right; 3046: moving the threaded sleeve to the left; 3047: right shifting the threaded sleeve; 3048: a left slider; 3049: a right slider; 305: a straight nut.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1-5, the confocal LED lighting source structure with the same frequency for detecting three-dimensional defects on the surface of a product of the present invention comprises a sampling lens assembly 1, an LED lighting source assembly 2 and an adjustable lighting position bracket 3,
the LED illuminating light source component 2 is arranged at the rear end part of the sampling lens component 1 through an adjustable illuminating position bracket 3,
the LED illumination light source component 2 is a co-focusing LED illumination light source with the same frequency, LED illumination lamp beads in the co-focusing LED illumination light source can be controlled to be turned on or turned off in a single-point mode, the co-focusing LED illumination light source component is evenly divided into a plurality of subarea LED lamp bead units according to the position sequence, the subarea LED lamp bead units are turned on or turned off in sequence according to the clock frequency of sequential exposure of pixels of the linear array CCD sensor along the working direction, and the LED illumination light source component 2 and the linear array CCD sensor are enabled;
the LED illuminating light source assembly 2 can adjust the positions of the LED illuminating light source assembly 2 in the left and right directions through the adjustable illuminating position support 3, so that the illuminating focusing point of an LED lamp bead in the LED illuminating light source assembly and the sampling focusing point of the linear array CCD sensor pixel point are located at the same position, and the confocal work is realized.
The LED illumination light source component 2 comprises an aluminum circuit substrate 201, an LED lamp bead strip 202 is arranged in the middle of the aluminum circuit substrate 201, a plurality of LED lamp beads 2021 are sequentially distributed at equal intervals on the LED lamp bead strip 202, an anode power supply terminal row 203 is arranged on the aluminum circuit substrate 201 on one side of the LED lamp bead strip 202, a cathode power supply terminal row 204 is arranged on the aluminum circuit substrate 201 on the other side of the LED lamp bead strip 202, the anode power supply terminal row 203 and the cathode power supply terminal row 204 are arranged in opposite sides, the anode of each LED lamp bead 2021 in the LED lamp bead strip 202 is respectively and sequentially connected with a terminal of the anode power supply terminal row 203, the cathode of each LED lamp bead 2021 in the LED lamp bead strip 202 is respectively and sequentially connected with a terminal of the cathode power supply terminal row 204, and point single control of the LED lamp beads 2021 in the LED lamp bead strip 202 is realized by controlling power supply at the position corresponding to the anode power supply terminal row 203 and the,
LED lamp pearl 2021 in LED lamp pearl strip 202 evenly divides into a plurality of subregion LED lamp pearl units according to the position order, aluminium system circuit substrate 201's border is provided with fixed mounting hole 205, installs on adjustable illumination position support 3 through fixed mounting hole 205, positive pole power supply binding post row 203, negative pole power supply binding post row 204 all include that multiunit interval distribution's binding post unit is arranged and is constituted, because the quantity that the lamp pearl needs is different, binding post row probably does not so just match on the market, needs multiunit cooperation to use.
The adjustable illumination position support 3 comprises a front lens collar 301, a middle support sheet 302 and a rear illumination light source connecting seat 304,
the front-end lens collar 301, the middle support sheet 302 and the rear-end illumination light source connecting seat 304 are sequentially distributed from front to back and are connected in a penetrating manner through connecting guide rods 303 located at four corners, the front-end lens collar 301 is sleeved on the outer side of the sampling lens assembly 1, the middle support sheet 302 is located at the rear end of the sampling lens assembly 1 and is provided with a first light source irradiation hole 3021, an LED illumination light source adjusting base 304 used for achieving the left-right adjusting function of the LED illumination light source assembly 2 is installed at the rear end of the rear-end illumination light source connecting seat 304, the rear-end illumination light source connecting seat 304 is provided with a second light source irradiation hole 3031, and the LED illumination light source adjusting base 304 is provided with a third light source irradiation hole 3041.
Preferably, middle backing sheet 302 and rear end illumination light source connecting seat 304 adopt the gilt brass material to make, when improving structural stability, realize dampproofing anticorrosive effect, the soaking nature is good, gilt oxidation resistance, anticorrosion, electric shielding performance is good.
Preferably, the LED lighting source adjusting base 304 includes an adjusting base plate 3042, two side edges of the adjusting base plate 3042 are perpendicularly bent toward the rear end to form a guiding side plate 3043, a left moving guide 3044 and a right moving guide 3045 penetrating the guiding side plates 3043 are installed behind the adjusting base plate 3042, the left moving guide 3044 and the right moving guide 3045 are oppositely arranged, a left moving threaded sleeve 3046 rotatably screwed on the left moving guide 3044, a right moving threaded sleeve 3047 rotatably screwed on the right moving guide 3045, a movable left slider 3048 fixed on two sides of the left moving threaded sleeve 3046, a movable right slider 3049 fixed on two sides of the right moving threaded sleeve 3047, four corners of the aluminum circuit board 201 are fixed on the left slider 3048 and the right slider 3049 at corresponding positions by fixing guide pillars 206,
the left moving guide rod 3044 and the right moving guide rod 3045 respectively drive the left moving threaded sleeve 3046 and the right moving threaded sleeve 3047 to move in the rotating process, and the left moving threaded sleeve 3046 or the right moving threaded sleeve 3047 moves to realize the movement of the left and right positions of the aluminum circuit substrate 201, so that the lighting focusing point of the LED lamp bead and the sampling focusing point of the pixel point of the linear array CCD sensor are located at the same position, and the confocal work is realized.
The anode power supply terminal block 203 and the cathode power supply terminal block 204 respectively comprise a plurality of groups of terminal block unit blocks distributed at intervals; the distance L1 between the LED lamp beads 2021 is 0.15mm, and the width L2 of the LED lamp beads 2021 is 0.33 mm; the rated voltage of the LED lamp bead 2021 is 3V, the rated probability is 0.45w, the LED lamp bead is instantly lightened to be overloaded to 11V, 4A, the overload can be realized by 97 times, the brightness is obviously improved, the LED lamp bead is short in electrifying time and cannot be damaged, the actual power consumption is low, the heat productivity is small, active heat dissipation parts are not needed any more, the whole size is small, the installation on site is convenient, the LED lamp bead is synchronously lightened sequentially with pixels scanned by the linear array CCD sensor, the lighting requirement is met, the energy consumption is greatly saved, and the service life is prolonged.
Preferably, the rotating ends of the left moving guide 3044 and the right moving guide 3045 are provided with a straight nut 305 for facilitating rotation, so as to facilitate selective adjustment of the LED lighting source assembly 2 and the sampling lens assembly 1 to realize confocal work.
Preferably, f is a working frequency of a single pixel of the linear array CCD sensor, the width of each pixel is i, the magnification of the scanning optical system is 1/X, the corresponding width of each pixel on an object image is i · X, the magnification of the lens is 1/Y, the width of the single LED lamp bead unit plus the two LED lamp bead units is S, an object image range S = S · Y in which the single LED lamp bead unit needs to be illuminated is S/i · X pixels, the time T1 for each LED lamp bead to be illuminated is = S · f/i · X, the overlapped electric quantity time T2 of adjacent LED lamp bead units is at least 1/f and less than 2/f, wherein X, Y is a characteristic parameter of the sampling lens assembly, and embodiment X = Y = 10.
Preferably, LED lamp pearl 2021 is one or more than one in the LED lamp pearl unit, selects different quantity lamp pearls to constitute LED lamp pearl unit according to the size of sample.
The LED lamp beads 2021 can be singly turned on or off, the LED lamp beads 2021 are distributed at odd-even field intervals, anodes of odd LED lamp beads are controlled by a power supply, the power supply a is a signal Pa array, anodes of even LED lamp beads are controlled by a power supply B, the power supply B is a signal Pb array, namely the lamp beads are controlled by odd-even fields, anodes of odd lamp beads are all connected to an MOS tube A in parallel, anodes of even lamp beads are all connected to an MOS tube B in parallel, the signal Pa controls the MOS tube A, the signal Pb controls the MOS tube B, when the MOS tube control voltage is high, the MOS tube is conducted, and the lamp bead anodes obtain external power supply; meanwhile, the cathode of each lamp bead is independently grounded through one MOS tube (0, 1, 2, 3 and 4), when the voltage for controlling the MOS tubes is high level, the MOS tubes are conducted, the cathodes are grounded and are at low level, and the lamp beads are lightened.
The co-focusing LED illuminating light source structure with the same frequency for detecting the three-dimensional defects on the surface of the product controls the on-off of the LED lamp beads in the partition LED lamp bead units at the corresponding positions in the LED illuminating light source according to the measured clock frequency of the pixels of the linear array CCD sensor exposed in sequence along the working direction, so that the LED lamp beads and the partition LED lamp bead units work synchronously with the same frequency, and the specific embodiment comprises the following steps:
firstly, a first LED lamp bead is lighted, after the first LED lamp bead is lighted for 10 mu s, a second LED lamp bead is lighted, after 0.5 mu s, the first LED lamp bead is turned off, after the second LED lamp bead is lighted for 10.5 mu s, a third LED lamp bead is lighted, and after 0.5 mu s, the second LED lamp bead is turned off. . . By analogy, except that the lighting time of the first LED lamp bead and the last LED lamp bead is 10.5 mu s, the lighting time of each lamp bead is 11 mu s, namely the previous LED lamp bead is independently lighted for 10 mu s, the next LED lamp bead is lighted, the two adjacent lamp beads are lighted within 0.5 mu s, then the previous LED lamp bead is extinguished, the next LED lamp bead is independently lighted for 10 mu s, when the single LED lamp bead is lighted, the middle part is lighted, the edge is dark, and in this way, the pixel lighting condition corresponding to the edge of the LED lamp bead is corresponding to the middle part, and the halo edges of the two adjacent LED lamp beads are superposed within 0.5 mu s of lighting, so that the edge brightness is improved, the continuity and the uniformity of lighting are increased, and the lighting environment is provided;
the light emitted by the LED lamp beads passes through the lens to form parallel light beams, the larger the aperture of the lens is, the higher the emitted light brightness is, the aperture of the lens of the conventional industrial camera is generally not more than F/2.8, and in order to improve the brightness as much as possible, a large-aperture photographic lens has to be selected. The number of LED lamp beads which can be matched with the lens is related to the lens (the picture frame corresponding to the sampling lens component 1 is related to the picture frame, the maximum picture frame in mass production is the picture frame in Fuji GFX, the size of the picture frame is 44X 33mm rectangle, the diameter of the imaging circle of the lens is 55mm of the length of the diagonal line of the picture frame rectangle, the size of the lamp strip LED lamp bead is 0.33X 0.81X 0.15mm, 0.33mm is the width of the LED lamp bead, the distance between the LED lamp beads is 0.15mm, the width space of 0.48mm is needed for each lamp bead, 55 is equal to 114.6 by dividing 0.48, the position is advanced to the maximum in order to ensure the utilization of the imaging circle, an even number is designed for the convenience of the symmetrical design of a circuit, 116 lamp beads are arranged, the number of the LED lamp beads basically meets the use of all linear array CCD sensors on the market, the maximum circle in the Fuji GFX lens is one optical 85mm F/1.2 lens, the focal length of the rear flange of the lens is 26., the lamp strip is 26.7mm away from the plane of the lens rear flange.
In summary, the co-focusing LED illumination source structure with same frequency for detecting three-dimensional defects on the surface of a product of the present invention has high reliability in fixing with a lens assembly, facilitates adjusting the illumination focal length of the LED illumination source, and instantly lights the LED lamp beads, which can cause overload and significantly increase the brightness, and lights in sequence in synchronization with the pixels of the linear array CCD sensor, selects the co-focusing LED illumination source to illuminate according to the attribute characteristics of the three-dimensional defects on the surface of the product, facilitates the projection imaging detection of the three-dimensional defects (including three-dimensional layer defects such as bumps and pits), and the LED illumination source can instantly light the LED lamp beads, and the LED illumination source which can be singly lighted, according to this operating characteristic, the LED lamp beads at the corresponding positions are lighted by mapping control, and instantly lights the LED lamp beads, which can cause overload and significantly increase the brightness, and because of short power-on time, the actual power consumption is low and the heat productivity is small, no longer need initiative radiating part, whole small, the on-the-spot installation of the product surface detection of being convenient for, be applicable to various industrial environment, and light in proper order in step with CCD sensor's pixel, when satisfying the illumination demand, very big saving energy consumption, the life-span is prolonged, and realize confocal working process (to three-dimensional fault) through the optics principle, improve the accuracy of the three-dimensional fault detection sample in product surface greatly, and can accomplish radiating demand through aluminium system circuit substrate, the illuminating effect is good, the radiating efficiency is high, overall stability is high, design benefit, the design is novel, and good application prospect has.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A confocal LED illumination light source structure of same frequency for three-dimensional defect detection on product surface, its characterized in that: comprises a sampling lens component (1), an LED illuminating light source component (2) and an adjustable illuminating position bracket (3),
the LED illumination light source component (2) is arranged at the rear end part of the sampling lens component (1) through the adjustable illumination position bracket (3),
the LED illuminating light source assembly (2) is a co-focusing LED illuminating light source with the same frequency, LED illuminating lamp beads in the LED illuminating light source assembly can be controlled to be turned on or turned off in a single-point mode, the LED illuminating light source assembly is evenly divided into a plurality of subarea LED lamp bead units according to the position sequence, the subarea LED lamp bead units are turned on or turned off in sequence according to the clock frequency of the pixels of the linear array CCD sensor in sequential exposure along the working direction, and the LED illuminating light source assembly (2) and the linear array CCD sensor are enabled to complete synchronous work;
the LED illuminating light source assembly (2) can adjust the positions of the LED illuminating light source assembly (2) in the left and right directions through the adjustable illuminating position support (3), so that the illuminating focusing point of an LED lamp bead in the LED illuminating light source assembly and the sampling focusing point of the linear array CCD sensor pixel point are located at the same position, and the confocal work is realized.
2. The structure of the co-focusing LED illumination light source used for detecting the three-dimensional defects on the surface of the product according to claim 1, is characterized in that: the LED illuminating light source assembly (2) comprises an aluminum circuit substrate (201), an LED lamp bead strip (202) is arranged in the middle of the aluminum circuit substrate (201), a plurality of LED lamp beads (2021) are sequentially distributed at equal intervals on the LED lamp bead strip (202), an anode power supply terminal strip (203) is arranged on the aluminum circuit substrate (201) on one side of the LED lamp bead strip (202), a cathode power supply terminal strip (204) is arranged on the aluminum circuit substrate (201) on the other side of the LED lamp bead strip (202), the anode power supply terminal strip (203) and the cathode power supply terminal strip (204) are arranged on opposite sides, the anodes of the LED lamp beads (2021) in the LED lamp bead strip (202) are respectively and sequentially connected with the terminals of the anode power supply terminal strip (203), the cathodes of the LED lamp beads (2021) in the LED lamp bead strip (202) are respectively and sequentially connected with the terminals of the cathode power supply terminal strip (204), the point single control of the LED lamp beads (2021) in the LED lamp bead strip (202) is realized by controlling the power supply of the corresponding positions of the anode power supply terminal strip (203) and the cathode power supply terminal strip (204),
LED lamp beads (2021) in the LED lamp bead strips (202) are evenly divided into a plurality of partitioned LED lamp bead units according to the position sequence, fixed mounting holes (205) are formed in the periphery of the aluminum circuit substrate (201), and the aluminum circuit substrate is mounted on the adjustable lighting position support (3) through the fixed mounting holes (205).
3. The structure of co-focal co-focusing LED illumination light source for detecting the three-dimensional defects on the surface of the product according to claim 2, wherein: the adjustable illumination position bracket (3) comprises a front end lens lantern ring (301), a middle support sheet (302) and a rear end illumination light source connecting seat (304),
the LED illumination light source adjusting device is characterized in that a front-end lens sleeve ring (301), an intermediate support sheet (302) and a rear-end illumination light source connecting seat (304) are sequentially distributed from front to back and are connected through connecting guide rods (303) at four corners in a penetrating manner, the front-end lens sleeve ring (301) is sleeved on the outer side of a sampling lens assembly (1), the intermediate support sheet (302) is located at the rear end of the sampling lens assembly (1) and is provided with a first light source illumination hole (3021), an LED illumination light source adjusting base (304) used for achieving the left-right adjusting function of an LED illumination light source assembly (2) is installed at the rear end of the rear-end illumination light source connecting seat (304), the rear-end illumination light source connecting seat (304) is provided with a second light source illumination hole (3031), and the LED illumination light source adjusting base (304) is provided.
4. The structure of the co-frequency confocal LED lighting source for detecting the three-dimensional defects on the surface of the product according to claim 3, wherein: the middle support piece (302) and the rear end illumination light source connecting seat (304) are made of gold-plated brass.
5. The structure of the co-frequency confocal LED lighting source for detecting the three-dimensional defects on the surface of the product according to claim 3, wherein: the LED lighting source adjusting base (304) comprises an adjusting base plate (3042), two side edges of the adjusting base plate (3042) are perpendicularly bent towards the rear end to form a guide side plate (3043), a left moving guide rod (3044) and a right moving guide rod (3045) which penetrate through the guide side plates (3043) at the two sides are installed behind the adjusting base plate (3042), the left moving guide rod (3044) and the right moving guide rod (3045) are oppositely arranged, a left moving threaded sleeve (3046) which is rotatably screwed is sleeved on the left moving guide rod (3044), a right moving threaded sleeve (3047) which is rotatably screwed is sleeved on the right moving guide rod (3045), movable left sliding blocks (3048) are fixed at two sides of the left moving threaded sleeve (3046), movable right sliding blocks (3049) are fixed at two sides of the right moving threaded sleeve (3047), and four corners of the aluminum circuit substrate (201) are respectively fixed on left sliding blocks (3048) and right sliding blocks (3049) at corresponding positions through fixing guide posts (206), On the right slide block (3049) is arranged,
the left moving guide rod (3044) and the right moving guide rod (3045) can respectively drive the left moving threaded sleeve (3046) and the right moving threaded sleeve (3047) to move in the rotating process, the left moving threaded sleeve (3046) or the right moving threaded sleeve (3047) moves to realize the movement of the left position and the right position of the aluminum circuit substrate (201), the lighting focusing point of the LED lamp bead and the sampling focusing point of the pixel point of the linear array CCD sensor are located at the same position, and the confocal work is realized.
6. The structure of co-focal co-focusing LED illumination light source for detecting the three-dimensional defects on the surface of the product according to claim 2, wherein: the anode power supply terminal block (203) and the cathode power supply terminal block (204) respectively comprise a plurality of groups of terminal block unit blocks which are distributed at intervals; the distance L1 between the LED lamp beads (2021) is 0.15mm, and the width L2 of the LED lamp beads (2021) is 0.33 mm; the rated voltage of the LED lamp bead (2021) is 3V, the rated probability is 0.45w, and the LED lamp bead is overloaded by instantaneous lighting.
7. The structure of the co-frequency confocal LED illumination light source used for detecting the three-dimensional defects on the surface of the product according to claim 5, wherein: the rotating ends of the left moving guide rod (3044) and the right moving guide rod (3045) are provided with straight nuts (305) which are convenient to rotate.
8. The structure of the co-focusing LED illumination light source used for detecting the three-dimensional defects on the surface of the product according to claim 1, is characterized in that: setting f as the working frequency of a single pixel of the linear array CCD sensor, the width of each pixel being i, the magnification of the scanning optical system being 1/X, the corresponding width of each pixel on an object image being i.X, the magnification of the lens being 1/Y, the width of the single LED lamp bead unit plus the two LED lamp bead units being S, the object image range S = s.Y required to be illuminated by the single LED lamp bead unit being S/i.X pixels, the time T1 required to be illuminated by each LED lamp bead unit being S.f/i.X, the time T2 of the overlapped electric quantity of the adjacent LED lamp bead units being at least 1/f and less than 2/f, wherein X, Y is a characteristic parameter of the sampling lens assembly (1).
9. The structure of the co-focusing LED illumination light source used for detecting the three-dimensional defects on the surface of the product according to claim 8, wherein: LED lamp pearl (2021) are one or more in the LED lamp pearl unit.
10. The structure of co-focal co-focusing LED lighting sources for detecting defects on the surface of a product according to claim 9, wherein: the LED lamp beads (2021) can be singly turned on or turned off, the LED lamp beads (2021) are distributed at intervals of odd and even fields, anodes of the odd LED lamp beads are controlled by a power supply a, the power supply a is a signal Pa array, anodes of the even LED lamp beads are controlled by a power supply b, and the power supply b is a signal Pb array.
CN202011167868.2A 2020-10-28 2020-10-28 Co-frequency confocal LED illumination light source structure for detecting three-dimensional defects on surface of product Pending CN112255174A (en)

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