EP4189370A1 - Dispositif et procede d'inspection en transmission de récipients comportant au moins une source de lumière à diode électroluminescente - Google Patents
Dispositif et procede d'inspection en transmission de récipients comportant au moins une source de lumière à diode électroluminescenteInfo
- Publication number
- EP4189370A1 EP4189370A1 EP21752580.7A EP21752580A EP4189370A1 EP 4189370 A1 EP4189370 A1 EP 4189370A1 EP 21752580 A EP21752580 A EP 21752580A EP 4189370 A1 EP4189370 A1 EP 4189370A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- spectral
- transmission
- emission
- glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 100
- 238000007689 inspection Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims description 22
- 230000003595 spectral effect Effects 0.000 claims abstract description 168
- 239000011521 glass Substances 0.000 claims abstract description 133
- 230000005855 radiation Effects 0.000 claims abstract description 39
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 238000000411 transmission spectrum Methods 0.000 claims abstract description 6
- 238000002834 transmittance Methods 0.000 claims description 30
- 238000001228 spectrum Methods 0.000 claims description 22
- 239000003086 colorant Substances 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 15
- 230000004044 response Effects 0.000 claims description 5
- 238000005286 illumination Methods 0.000 description 18
- 230000006870 function Effects 0.000 description 15
- 230000007547 defect Effects 0.000 description 10
- 230000004913 activation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- PLXMOAALOJOTIY-FPTXNFDTSA-N Aesculin Natural products OC[C@@H]1[C@@H](O)[C@H](O)[C@@H](O)[C@H](O)[C@H]1Oc2cc3C=CC(=O)Oc3cc2O PLXMOAALOJOTIY-FPTXNFDTSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 125000001475 halogen functional group Chemical group 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 244000045947 parasite Species 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- 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
- G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
-
- 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
- G01N21/8806—Specially adapted optical and illumination features
-
- 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
- G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
- G01N21/9036—Investigating the presence of flaws or contamination in a container or its contents using arrays of emitters or receivers
-
- 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
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8812—Diffuse illumination, e.g. "sky"
- G01N2021/8816—Diffuse illumination, e.g. "sky" by using multiple sources, e.g. LEDs
-
- 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
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8835—Adjustable illumination, e.g. software adjustable screen
-
- 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
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8845—Multiple wavelengths of illumination or detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
- G01N2201/0627—Use of several LED's for spectral resolution
Definitions
- the present invention relates to the technical field of transmission inspection of empty glass containers, such as for example bottles, jars, flasks in order to detect any defects.
- the present invention relates more specifically to the light sources used in the context of transmission inspection of empty glass containers.
- a light source emits light radiation which illuminates the container in such a way that the light penetrates the thickness of the wall of the container and then comes out, possibly undergoing a modification, the analysis of which makes it possible to deduce a quality of the container.
- the light sources must make it possible to inspect containers having different shades of glass.
- light sources must take into account the spectral absorption of the glass which is a function of the wavelength giving the percentage of light absorbed per mm of glass passed through, considering that the spectral absorption of the glass depends on the glass tint.
- the inspection in transmission or by a passing light therefore consists in creating and observing the modifications such as, for example, the deviation of light by reflection on a defect such as a glaze, the deviation of light by refraction on a defect such as a fold or a bad distribution of glass creating differences in parallelism between the internal face and the external face, the absorption of light by dirt or an internal foreign body, the absorption of light by the glass varying with the thickness of the glass passed through.
- At least one light sensor collects the light coming from the source and having penetrated the wall of the container.
- Light sensors are generally linear or matrix cameras associated with optical systems such as lenses, prisms or mirrors for example.
- the light sensor receives light only when a fault is present. In other cases, the light sensor receives light when there is no fault. In all cases, the light collected by the light sensor passes through a thickness of glass of the container corresponding to only part of the glass wall or to the whole of the glass wall.
- [0007JII is thus known to observe “in a dark field” so that the light sensor only receives light in the presence of a defect, such as for detecting glazes, for example.
- a region of the container is illuminated, under precise incidences, by means of projectors emitting, in the direction of said region, directed light beams (convergent or slightly divergent).
- the directed light beams reach the surface of the container at a precise incidence so that the major part of the beam penetrates the glass wall and propagates in the glass.
- the glaze reflects the beam which leaves in a modified direction to exit the wall according to a precise exit angle, which is a function of the incident angle and the position and shape of the glaze.
- a precise exit angle which is a function of the incident angle and the position and shape of the glaze.
- Headlamps emitting point or quasi-point directed light beams can be made in various ways.
- patent EP 1 147 405 proposes implementing illumination heads each emitting a ray or a focused and/or colimated light beam. These illumination heads are each connected by optical fibers to a halogen lamp.
- a large number of light sources and sensors are used. of images which cooperate by emitter/receiver pairs.
- Patent EP 3 118 609 proposes making the light source using a first, a second and a third laser source of different wavelengths, associated with optical structures for redirection towards a zone of focus. The wavelengths are such that glass containers made of different colored glass can be inspected using these three laser sources.
- the first wavelength of light is between 440-490 nm and more preferably between 440-460 nm and even more preferably is 450 nm (blue)
- the second wavelength of light is between between 495-570 nm and more preferably between 510-530 nm and even more preferably is 520 nm (green)
- the third wavelength of light is between 620-750 nm, more preferably between 625-665 nm, more preferably between 630-650 nm and even more preferably is 640 nm (red).
- the containers are caused to scroll in translation between, on one side, one or more light sensors and, on the other side, a light source of the backlighting panel type, of preferably forming a diffuse luminous surface.
- the camera(s) perceive the light coming from the source and passing completely through the containers inspected from side to side.
- the luminous surface is of dimensions adapted to those of the container and to the type of inspection desired.
- the source can be uniform or have continuous or discontinuous, monotonous or periodic, slow or fast, spatial variations of the level of light.
- patent EP 1 143 237 describes a backlight panel type light source comprising a series of individually driven light emitting diodes to illuminate specific areas of illumination with variations in light.
- the inspection in transmission of empty glass containers is also implemented in particular for the inspection of the appearance of the bottom of the glass containers, the reading of codes carried by the glass containers or the measurement of the thickness of the wall of glass containers.
- patent application US 2006/092410 describes a transmission inspection device for containers comprising, according to a first embodiment, several light-emitting diodes and associated lenses focusing the light emitted by each of the diodes on the same region of the container to be inspected.
- the light-emitting diodes are mounted on a heat sink and are each associated with lenses so that the lights emitted by the diodes converge to be adjacent to each other on the illuminated target surface.
- the light-emitting diodes have identical or different transmission wavelengths. These light-emitting diodes cannot be focused together at a point on the illuminated object by means of a single lens, which would lead to shifts in the illuminated regions.
- Such a device is not suitable for emitting light radiation suitable for transmission inspection of glass containers having a determined tint, without interference.
- the Applicant has had the merit of expressing the need to have a relatively universal device for inspecting glass containers in transmission with a wide range of different colors while allowing its implementation for observation in a dark field. and a white field observation.
- the present invention aims to satisfy this need by proposing a new device for inspecting in transmission glass containers having different tints over a wide range while allowing its implementation for dark field observation and field observation. White.
- the object of the invention relates to a device for inspecting containers with glass walls comprising at least one light source emitting light radiation in the direction of the container and comprising at least one elementary source controlled, at least one light sensor recovering the light coming from the light source and having penetrated into the wall of the container and which comes out of the container.
- At least one driven elementary source is constituted by a light-emitting diode with at least two blocks mounted juxtaposed on a common support and emitting light radiation in different emission spectral bands which are a function of the transmission spectra of families of shades of glass containers, each spectral emission band of a block being limited to a transmission spectral band suitable for transmission inspection for at least one family of tints of glass containers, by excluding the spectral bands of absorption for this family of tints of glass containers and in that the device comprises an electronic power supply device independently controlling each block of each elementary source so that for the inspection of glass containers belonging to a family of tints, emission is controlled, the block emitting in the spectral band of transmission adapted to transmission inspection for the tint of said containers.
- a light-emitting diode has at least one block emitting light radiation in an emission spectral band comprised between 500 and 620 nm.
- a light-emitting diode has at least one block emitting light radiation in an emission spectral band comprised between 700 and 1000 nm.
- a light-emitting diode has at least one block emitting light radiation in an emission spectral band between 730 and 745 nm.
- a light-emitting diode has at least one patch emitting light radiation in an emission spectral band between 830 and 870 nm.
- a light-emitting diode has four juxtaposed blocks.
- the four-block light-emitting diode comprises a first and a second block emitting light radiation in different emission spectral bands and a third and a fourth block emitting light radiation in the same emission spectral band. which is different from the emission spectral bands of the first and second tiles.
- the blocks of the light-emitting diode are mounted on a common support to form an electronic component which is soldered to an electronic power supply and control circuit to form a controlled elementary source, the electronic circuit supply and control being itself connected to the electronic supply device controlling the operation of the blocks.
- the light source comprises, in a box, the electronic supply and control circuit and an optical projection system able to project the light emitted by the blocks of the light-emitting diode so as to superimposing the areas illuminated by the blocks in a focusing region corresponding to a region of the container to be inspected.
- the light source comprises several controlled elementary sources, mounted distributed on an electronic control circuit board to form a one- or two-dimensional light source.
- Another object of the invention relates to a method for inspecting in transmission containers with glass walls using at least one light source and at least one light sensor. According to the invention, the method comprises the following steps:
- - define for at least two families of tints of glass containers, and for each of them, a spectral transmission band suitable for inspection in transmission for the family of tints of glass containers and the spectral absorption bands for this family of tints of glass containers;
- each spectral emission band of a block being limited to a spectral transmission band suitable for inspection in transmission for at least one family of shades of glass containers, excluding the spectral absorption bands for this family of glass container colors;
- transmittance spectra are grouped together in a family of tints of glass containers for which are defined on the one hand, at least one common transmission spectral band suitable for transmission inspection for the family of tints of glass containers and comprising a maximum and on the other hand, outside this or these spectral bands of transmission, the spectral bands of absorption.
- the method consists in comparing the transmission spectral bands suitable for transmission inspection for different families of tints of glass containers of so as to define for each block, an emission spectral band limited to a transmission spectral band suitable for inspection in transmission for different families of receptacle colors.
- the spectral emission bands of the blocks are chosen according to the spectral response curve of the light sensor.
- the emission spectral bands of the at least two blocks are chosen to include at least the following two emission spectral bands:
- the emission spectral bands of the third and/or fourth squares are chosen to include at least one of the following two emission spectral bands:
- the width of the spectral emission band of each patch is less than 150 nm.
- FIG. 1 is a schematic view of a first embodiment of a transmission inspection device according to the invention, the light source of which is made in the form of a projector.
- FIG. 2A is a schematic view of a light source implemented in an inspection device according to the invention and provided with a projection optical system.
- FIG. 2B is a schematic view of a light source implemented in an inspection device according to the invention and provided with another projection optical system.
- Figure 3 is a schematic view of a light source not implementing the object of the invention and showing the projection obtained with three light-emitting diodes with a single patch.
- Figure 4 is a graphical representation of curves of transmittance (in %) at a thickness of 2 mm of glass, as a function of the wavelength (in nm), for an example of a family of tints of glass corresponding to the color amber.
- Figure 5 is a graphical representation of curves of transmittance (in %) at a thickness of 2 mm of glass, as a function of the wavelength (in nm), for an example of a family of tints of glass corresponding to the color blue.
- Figure 6 is a graphical representation of curves of the transmittance (in %) at a thickness of 2 mm of glass, as a function of the wavelength (in nm), for different shades of glass.
- Figure 7 is a graphical representation of the curve of relative spectral power (P) of a light-emitting diode as a function of wavelength (nm) showing the width PcL of the emission spectral band of a light-emitting diode taken at the mid-height of the peak of the lobe of the curve.
- Figure 8 is a graphical representation of the curve of spectral response R (V/s/W/m 2 ) as a function of wavelength (nm) for an example of a light sensor implemented in the inspection device according to the invention.
- Figure 9A is a schematic plan view of a second embodiment of a transmission inspection device according to the invention, the light source of which is made in the form of a backlight panel .
- Figure 9B is a schematic elevational sectional view of the second embodiment of the transmission inspection device according to the invention illustrated in Figure 9A.
- the object of the invention relates to a device 1 suitable for inspecting in transmission empty containers 2 with glass walls of all types such as bottles, pots or bottles for example.
- the inspection device 1 comprises at least one light source 3 emitting light radiation in the direction of the container 2 and at least one light sensor 4 recovering the light coming from the light source 3 and having penetrated the wall of the container and coming out of the container. It should be understood that the light sensor 4 collects the light coming from the light source having partially or completely crossed the wall of the container 2.
- the inspection device 1 according to the invention is suitable for inspecting containers 2 with glass walls in transmission, in particular for checking the appearance of the containers, reading codes, for example datamatrix, carried by the containers or the vessel wall thickness measurement.
- the inspection device 1 according to the invention is also suitable for inspecting receptacles 2 in transmission in order to detect defects such as glazes, folds or a poor distribution of glass.
- the light sensor 4 such as a camera can be of any type known per se.
- the light sensor 4 comprises a photoelectric sensor, which may for example be of the CCD type or of the CMOS type, and an optical conditioning device which may comprise one or more optical components from among optical lenses, mirrors, light guides (in particular fiber optics), fixed diaphragms such as masks or adjustable diaphragms such as iris diaphragms, etc.
- the light source 3 comprises at least one driven elementary light source 5 consisting of a light-emitting diode 6 with at least two juxtaposed blocks 7 emitting light radiation in different emission spectral bands.
- the light-emitting diode 6 (LED in English: light-emitting diode, or LED in French) is an opto-electronic device capable of emitting light when it is traversed by an electric current.
- a light-emitting diode produces light radiation by converting electrical energy when a current passes through it.
- each light-emitting diode 6 comprises several blocks 7, that is to say several PN junctions, so that the light-emitting diode 6 is a multi-block light-emitting diode.
- Each block 7 or in English “die” is a small rectangular piece resulting from the cutting of a wafer on which an integrated circuit has been manufactured.
- a pad designates the integrated circuit itself without its case and is synonymous with an electronic chip.
- the blocks 7 are obtained by cutting semiconductor wafers on which one or even several electronic circuits have been reproduced identically by a succession of different photolithography steps, ion implants, deposition of thin layers, etc.
- each block 7 is a parallelepiped having an upper surface delimited by two longitudinal edges parallel to each other and connected by two side edges parallel to each other.
- the upper surface of a block 7 has a square or rectangular shape while the thickness of a block is less than one mm.
- the blocks 7 of the light-emitting diode 6 are mounted on a common support 8 to constitute an electronic component which forms the driven elementary source 5.
- This electronic component or driven elementary source 5 is soldered to an electronic power supply and steering 9.
- the blocks 7 of the light emitting diode 6 are mounted juxtaposed on the common support 8, that is to say that the blocks are placed close to each other.
- two blocks 7 are juxtaposed if the neighboring or opposite edges of the two blocks are separated by a difference of less than 0.5 mm and for example equal to 0.15 mm.
- the light-emitting diode 6 has four blocks 7 juxtaposed, that is to say two blocks 7 located side by side and placed above close to a pair of blocks 7 also located side by side.
- each block 7 has an upper surface having a length, for example, of 1 mm and a width, for example, of 1 mm.
- the fourth blocks 7 of the light-emitting diode 6 present on the surface, a size, for example, in length of 2.5 mm and in width of 2.5 mm. This surface space takes into account the gap remaining between the neighboring edges of the blocks 7.
- the light-emitting diode 6 can comprise a different number of blocks 7.
- the light-emitting diode 6 can comprise for example two blocks 7 juxtaposed or three juxtaposed blocks 7 having the same configuration as the example illustrated in the Figures with four blocks, one of the blocks 7 of which is deleted.
- each light-emitting diode 6 multi-patches 7 forms a quasi-point light source.
- the light source 3 comprises a projection optical system 11 capable of projecting the light emitted by the blocks 7 of the diode electroluminescent 6 so as to superimpose the zones illuminated by the blocks 7 in a focusing region 12 corresponding to a region of the container to be inspected (FIGS. 1 and 2A).
- the light source 3 is a projector projecting an image of the light-emitting diode onto a region of the container to be inspected.
- Each light-emitting diode 6 multi-patches 7 thus forms a quasi-point light source intended by focusing to emit a directional light beam, that is to say a beam of light rays having a beam axis and the rays of which are contained in an angle weak solid around this beam axis.
- the light source 3 comprises a casing 13 in which is mounted the electronic supply and control circuit 9 on which the common support 8 of the blocks 7 of the light-emitting diode 6 is welded.
- the housing 13 also includes the projection optical system 11 which can be made in any suitable way.
- the projection optical system 11 comprises a light guide 11a recovering the light emitted directly by the blocks 7 and leading the recovered light to a focusing lens 11b which superimposes the areas illuminated by the blocks 7 in a focus region 12.
- 2B illustrates an alternative embodiment of the projection optical system 11 which comprises only a focusing lens 11c which superimposes the zones illuminated by the blocks 7 in a focusing region 12a presenting a common central zone of superposition of the light coming from the four blocks 7, with overflows of light around this common central zone, the surface overflows being markedly smaller than the common central zone, for example they represent less than 10% of the total illuminated surface.
- FIGS. 2A and 2B A comparison of Figures 2A and 2B with Figure 3 clearly shows the advantage of the driven elementary source 5 in accordance with the invention comprising the common support 8 on which the blocks 7 of the light-emitting diode 6 are fixed.
- 3 shows an exemplary embodiment of a light source not implementing the invention and comprising three light-emitting diodes D with a single block mounted close to each other on a common circuit C. The light emitted directly by the three blocks of the three light-emitting diodes D with a single block is recovered by a focusing lens L analogous to the focusing lenses illustrated in FIGS. 2A and 2B.
- the controlled elementary source 5 can be implemented in a first embodiment for which the light source 3 is a projector.
- the driven elementary source 5 in accordance with the invention can be implemented in a second embodiment for which the light source 3 is a backlight panel.
- several driven elementary sources 5 are soldered to an electronic power supply circuit and driver 9 in front of which is generally placed a diffusing plate 14.
- the light source 3 thus comprises several driven elementary sources 5, mounted on the electronic power supply and driver circuit being distributed over this circuit to form a mono light source or two-dimensional.
- Each block 7 of the light-emitting diode 6 emits light radiation in a determined emission spectral band.
- blocks 7 are selected or manufactured to produce lighting suitable for transmission inspection of glass containers falling within a wide range of tints.
- the width PcL of the emission spectral band of a light-emitting diode is taken at the mid-height of the peak of the lobe of the curve of relative spectral power P as a function of wavelength l (nm).
- each spectral band of emission of a block 7 is limited to a spectral band of transmission Zt suitable for inspection in transmission for at least one family of shades of glass containers, excluding the spectral absorption bands Za for this family of glass container tints.
- the width PcL of the spectral emission band of each patch 7 is less than 150 nm. It is thus easy for each spectral band of emission of a box 7 to be limited to a spectral band of transmission Zt suitable for inspection in transmission for at least one family of shades of glass containers, while excluding the spectral bands Za absorption rate for this family of glass container shades.
- the spectral absorption of glass A(l) is a function of the wavelength giving the % of light absorbed per mm of glass passed through.
- the absorption of 2 or 3 mm glass slides is generally measured.
- the spectral absorption defines the shades of the lens precisely. It is also possible to compare, for a given lens, the different portions of the spectrum: for example, it is possible to distinguish portions of the spectrum that are little absorbed (almost 0% for 2mm) or strongly absorbed (almost 100%).
- Figure 4 gives an example of the transmittance curves (in %) at a thickness of 2 mm of glass, as a function of the wavelength (in nm), for a family of glass tints corresponding to the amber color.
- This Figure 4 brings together seven examples of transmittance curves for glass tints of receptacles close to each other and belonging to the amber tint. These transmittance spectra that have been pooled show common patterns or concurrent evolution. Thus, these curves have a first transmittance maximum M1 framed by a first minimum m1 and by a second minimum m2 and a second transmittance maximum M2 framed by the second minimum m2 and a third minimum m3. Even if the transmittance values are different for the minimums and maximums of these different tints, these minimums and maximums can be defined for determined values of the wavelength.
- the object of the invention aims to seek the maximum amount of light having passed through the container while not emitting in the absorbed wavelengths which are useless and likely to affect the quality of the inspection. .
- the transmittance of the glass is to be considered in a relative way because the maximum of the transmittance for a tint of glass can be low as for a dark glass but remains not negligible compared to the rest of the spectrum.
- At least one spectral transmission band Zt is defined suitable for transmission inspection for the family of glass receptacle shades and at least one spectral band of Za absorption for this family of glass container shades.
- the transmission spectral band Zt comprises a maximum and advantageously the maximum possessing the greatest transmittance value, namely the maximum M2.
- the transmission spectral band Zt is between 550 nm and 800 nm while the absorption spectral band Za is between 300 and 525 nm.
- Figure 5 gives an example of transmittance curves (in %) at a thickness of 2 mm of glass, as a function of the wavelength (in nm), for an example of a family of glass tints corresponding to the color blue.
- This Figure 5 brings together eight examples of transmittance curves for glass tints of receptacles close to each other and belonging to the blue tint. These transmittance spectra that have been pooled show common patterns or concurrent evolution. Thus, these curves have a first M1, a second M2 and a third maximum M3 of transmittance each framed by a pair of minima respectively m1-m2, m2-m3 and m3-m4.
- the transmittance values are different for the minimums and maximums of these different tints, these minimums and maximums can be defined for determined values of the wavelength.
- two spectral transmission bands Zt suitable for transmission inspection are defined for the family of glass receptacle tints comprising the first M1 and the third M3 maximum and a spectral band d absorption Za for this family of glass container colors (including the second maximum M2). It is thus possible to define a first transmission spectral band Zt comprising the first maximum M1 but also a second transmission spectral band Zt comprising the third maximum M3 whose transmittance value, although lower than the value of the first maximum, may be suitable for an inspection in transmission.
- the Zt transmission spectral bands are between 325 nm and 410 nm and between 675 and 850 nm while the Za absorption spectral band is between 475 and 630 nm.
- Figure 6 illustrates by way of example, the curves of the transmittance at a thickness of 2 mm of glass, as a function of the wavelength, for different families of glass shades Al, A2, A3, A4 corresponding respectively to extra white, blue, green and amber glass.
- the spectral emission bands of the blocks 7 of a light-emitting diode are chosen depending on the transmittance for different families of glass tints.
- each spectral emission band of a box 7 is limited to a transmission spectral band suitable for transmission inspection for at least one family of glass container tints, excluding the absorption spectral bands for this family of glass container tints.
- the analysis of the transmittance spectra for a large number of glass tints has made it possible to define the spectral bands of the blocks 7 of a light-emitting diode 6.
- the three bands are represented by way of example spectral Bl, B2, B3 of three blocks 7 of a light emitting diode 6.
- the light-emitting diode 6 has at least one block 7 emitting light radiation in an emission spectral band comprised between 500 and 620 nm with a central value at 565 nm.
- the light emitted by such a block 7 is particularly suitable for inspecting tinted glasses classified in the green category (curve A3) corresponding to tints, amber, oak, dead leaves, green for example.
- light-emitting diode 6 has at least one block 7 emitting light radiation in an emission spectral band comprised between 700 and 1000 nm.
- light-emitting diode 6 has at least one block 7 emitting light radiation in a spectral emission band comprised between 730 and 745 nm with a central value at 740 nm.
- the light emitted by such a block 7 is particularly suitable for inspecting glasses with tints classified in the blue category (curve A2) and the amber category (curve A4) corresponding to blue or amber oak tints for example.
- the light-emitting diode 6 has at least one block 7 emitting light radiation in a spectral emission band comprised between 830 and 870 nm with a central value at 850 nm.
- the light emitted by such a block 7 is particularly suitable for inspecting glasses with tints classified in the blue category (curve A2) corresponding to dark tints such as black, purple, dark grey, blue or green for example.
- the light-emitting diode has at least one block 7 emitting light radiation in a spectral emission band between 320 and 425 nm and preferably 370 and 390 nm with a central value at 385 nm.
- the light emitted by such a block 7 is particularly suitable for inspecting glasses with tints classified in the blue category (curve A2) or the green category (curve A3) corresponding to dark tints such as blue or green for example.
- the light-emitting diode 6 comprises at least two blocks 7 chosen to include at least the following two emission spectral bands:
- the light-emitting diode 6 comprises three or four blocks 7.
- the emission spectral bands of a third and/or fourth block 7 are chosen to include at least one of the two spectral bands of the following issues:
- the light-emitting diode 6 has four blocks 7 comprising a first block and a second block emitting light radiation in different emission spectral bands and a third and a fourth block emitting light radiation in the same emission spectral band which is different from the emission spectral bands of the first and second blocks.
- Such a variant embodiment makes it possible to increase the power of the light radiation in a specific emission spectral band corresponding to the inspection of widespread lens tints.
- the light-emitting diode 6 may comprise several blocks 7 associated so as to emit light radiation in at least two different emission spectral bands, with some of the tiles capable of emitting light radiation in identical emission spectral bands.
- a light-emitting diode 6 with four blocks 7 can comprise:
- a first and second blocks 7 emitting an emission spectral band between 500 and 620 nm;
- a third block 7 emitting an emission spectral band between 830 and 870 nm;
- a fourth box 7 emitting an emission spectral band between 730 and 745 nm.
- a light-emitting diode 6 with four blocks 7 can comprise:
- a first and second blocks 7 emitting an emission spectral band between 500 and 620 nm;
- a third and fourth blocks 7 emitting a spectral emission band between 830 and 870 nm.
- a light-emitting diode 6 with four blocks 7 can comprise:
- a first block 7 emitting a spectral emission band between 500 and 620 nm;
- a second block 7 emitting an emission spectral band between 830 and 870 nm;
- a third block 7 emitting an emission spectral band between 730 and 745 nm;
- a fourth box 7 emitting an emission spectral band between 370 and 390 nm.
- the inspection device 1 comprises an electronic power supply device 15 independently controlling each block 7 of each elementary source 6 so that for the inspection of containers in glass belonging to a family of tints, is controlled in emission, block 7 or blocks 7 emitting in the band spectral emission suitable for inspection in transmission for the tint of said containers.
- the electronic supply device 15 controls the operation of the blocks 7 having the transmittance spectra adapted to this glass tint and only this or these blocks 7. It follows that the light source 3 emits light radiation in a limited spectrum suitable for transmission inspection without emitting wavelengths absorbed by the glass.
- the electronic supply device 15 controls the operation of the block(s) 7 possessing the transmittance spectra adapted to this new glass tint and only this or these blocks 7.
- the inspection in transmission for containers having different colors can be carried out without changing the light source 3.
- the choice and selection of the spectral emission bands of the blocks 7 of the light-emitting diode makes it possible to increase the quantity of light having partially or completely passed through the wall of the container and consequently, to increase the quality of the signal from the light sensor 4.
- the wavelengths likely to interfere with the inspection of the containers are not emitted. This in particular avoids the appearance of parasites by reflection on the glass when the glazes are detected by light sources 3 of the projector type (FIG. 1).
- the light arriving in the container image zone reaches the sensor by crossing the container, undergoing the spectral absorption of the glass.
- the light arriving in the source image zone is not absorbed whatever its spectrum. Thanks to the emission in the spectral transmission band Zt of the glass, a sufficient quantity of light will be received for the container image zone in order to produce an image to be analyzed, for example to detect defects refracting or absorbing the transmitted light.
- the light coming from the light source and emitted in the spectral transmission band Zt will not be absorbed, but without the invention would be added the light emitted in the absorption band Za which would not be not absorbed either since it would not pass through the container.
- the light emitted in the absorption band Za useless for detection in transmission, could increase the energy and the risk of parasitic reflections of the light emitted reflecting from a container to another, these reflections possibly being misinterpreted to lead to false rejections or, conversely, preventing the analysis of portions of containers masking potential defects.
- the light source 3 forms a projector according to the first embodiment.
- a series of projectors is implemented in association with one or more light sensors 4.
- the switching on and off of these projectors are electrically controlled by the electronic power supply system 15.
- the duration of an emitted pulse of light as well as optical characteristics such as intensity or spectral composition or color of the emitted light can be controlled electrically
- the illumination parameters of the headlights 3 include for example:
- trigger a delay or delay between the trigger signal (called trigger) and the start of illumination and/or
- an illumination time which is the duration during which the light is emitted and/or
- the set of illumination parameters constitutes a set of illumination parameters of a projector that can be collected in a table TAB of sets J1, J2, J3, ... of acquisition parameters, as illustrated in Figure 1.
- the successive or distant illuminations in time of a projector for each container can be carried out with different sets of illumination parameters. This makes it possible, for example, to switch on certain projectors and not others during all image acquisitions by a light sensor, or even to adapt the incident light energy according to the regions illuminated or inspected, or even groups of projectors can illuminate the same area in different numbers depending on the type of image to be produced and/or the associated light sensor.
- the electronic supply and control circuit 9 of each headlamp comprises a Cpp circuit controlling, for example, the storage, charging and discharging of electrical energy in the blocks of the light-emitting diode 6.
- the storage of electric charge is a capacity.
- Each projector is connected to an electrical power supply and to the electronic power supply system 15 by a connection, for example wired, via an interface circuit Cint.
- a network is organized to link all the projectors to the electronic power supply system 15. The link operates according to a communication protocol of bus type, allowing the electronic power supply system to separately address each projector or each set of projectors to supply it with at least one set of illumination parameters and one trigger signal.
- the electronic supply and control circuit 9 of each projector or assembly contains a memory capable of recording a list or a table of several sets of successive illumination parameters, and a sequencer such that at each trigger signal, the set of illumination settings applied is the next set in the list.
- the electronic supply system 15 in a start-up phase or adjustment of the inspection, programs or saves for each projector, an equal number of sets of successive illumination parameters. Then, for each receptacle, depending on the movement of the receptacle in an inspection zone, the electronic supply system triggers the image acquisitions and the illuminations by sending a trigger signal to each light sensor and each projector. It can also be envisaged sending a single common trigger signal to all the projectors for each incremental movement of the container. Provision is made in the illumination parameter set lists for parameter sets indicating not to illuminate the projector on a trigger signal. Thus, the projectors are illuminated only to contribute to specific conditions of illumination of a region of the container for observation by a given light sensor in order to detect given defects.
- the object of the invention is also advantageous when the light source 3 is of the backlight panel type.
- the density of driven elementary sources 5 placed on a panel is greater than the density obtained by single-pad diodes, having different emission spectral bands and distributed over such a panel.
- elementary sources driven 5 at different emission spectral bands it follows that the different optical configurations such as patterns, power variations and shapes generated by the backlight panel are the same whatever the composition of the chosen wavelengths (simultaneous activation of one or more blocks 7).
- This light source also makes it possible to create a backlight source with spatial variations of the color, by creating for example a color gradient or bands of alternating colors.
- Another object of the invention is to propose a new method for inspecting in transmission containers 2 with glass walls using at least one light source 3 and at least one light sensor 4.
- the process includes the following steps:
- At least one elementary source 3 comprising a light-emitting diode 6 with at least two juxtaposed blocks 7 emitting light radiation in different emission spectral bands which are a function of the transmission spectra of the families of shades of glass containers, each emission spectral band of a patch being limited to a transmission spectral band Zt suitable for transmission inspection for at least one family of glass container tints, excluding the absorption spectral bands Za for this family tints of glass containers;
- the transmittance spectra of glass containers having similar colors are analyzed by identifying the maximum M1, M2, M3, ... and the minimum ml, m2, m3, m4, ... of the spectra as explained in relation to the Figures 4 and 5; - at least some of these transmittance spectra are grouped together in a family of tints of glass containers for which are defined on the one hand, at least one common transmission spectral band suitable for transmission inspection for the family of tints of glass containers and comprising a maximum and on the other hand, outside this or these spectral bands of transmission, the spectral bands of absorption.
- the method consists in comparing the transmission spectral bands suitable for transmission inspection for different families of shades of glass containers so as to define for each block 7, a limited emission spectral band to a transmission spectral band Zt suitable for transmission inspection for different families of colors of receptacles, so as not to contain any absorption spectral band Za.
- blocks 7 are selected according to the transmittance spectra of the different glass tints of the containers to be inspected.
- the spectral emission bands of the blocks 7 are also chosen according to the spectral response curve of the light sensor 4, an example of which is given in FIG. 8. This makes it possible to perfect the choice of the spectral emission bands of the blocks 7 so that the light sensor 4 has good sensitivity for the chosen emission spectral bands.
- Such a method of inspection by transmission can be implemented to detect in particular the glazes of the containers by the projectors.
- the light source produced by the backlighting panel it can be implemented in particular, an inspection of the aspect of the containers to detect absorbent or strongly refracting defects, inspections of aspects with light gradient, an inspection stress defects by polarized light, reading the codes carried by the containers.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2008027A FR3113131B1 (fr) | 2020-07-29 | 2020-07-29 | Dispositif et procédé d'inspection en transmission de récipients comportant au moins une source de lumière à diode électroluminescente |
| PCT/FR2021/051373 WO2022023652A1 (fr) | 2020-07-29 | 2021-07-22 | Dispositif et procede d'inspection en transmission de récipients comportant au moins une source de lumière à diode électroluminescente |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4189370A1 true EP4189370A1 (fr) | 2023-06-07 |
Family
ID=73793308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21752580.7A Withdrawn EP4189370A1 (fr) | 2020-07-29 | 2021-07-22 | Dispositif et procede d'inspection en transmission de récipients comportant au moins une source de lumière à diode électroluminescente |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230288343A1 (fr) |
| EP (1) | EP4189370A1 (fr) |
| CN (1) | CN116348756A (fr) |
| FR (1) | FR3113131B1 (fr) |
| WO (1) | WO2022023652A1 (fr) |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2086800A (en) | 1999-01-19 | 2000-08-07 | Visiglas Societe Anonyme | Method and device for detecting crizzling in translucent or transparent material |
| DE19953738C1 (de) * | 1999-11-09 | 2001-06-07 | Krones Ag | Inspektionsvorrichtung zur Seitenwandkontrolle von Gefäßen |
| DE10017126C1 (de) | 2000-04-06 | 2001-06-13 | Krones Ag | Verfahren und Vorrichtung zum optischen Überprüfen transparenter Behälter |
| US20060092410A1 (en) * | 2004-10-28 | 2006-05-04 | Owens-Brockway Glass Container Inc. | Container inspection by directly focusing a light emitting die element onto the container |
| FR2907553B1 (fr) * | 2006-10-24 | 2009-02-13 | Tiama Sa | Procede et dispositif pour detecter des defauts a faible et fort contrastes dans des objets transparents ou translucides |
| DE102008016458A1 (de) * | 2008-03-31 | 2009-10-01 | Osram Gesellschaft mit beschränkter Haftung | Leiterplatte |
| US8403527B2 (en) * | 2010-10-26 | 2013-03-26 | Thomas J. Brukilacchio | Light emitting diode projector |
| FR2990524B1 (fr) * | 2012-05-09 | 2016-05-13 | Archimej Tech | Dispositif d'emission d'un faisceau lumineux de spectre controle. |
| CN104132316A (zh) * | 2014-07-23 | 2014-11-05 | 苏州吉视电子科技有限公司 | 一种工业检测用led光源 |
| DE102014220598B4 (de) * | 2014-10-10 | 2023-07-13 | Krones Aktiengesellschaft | Inspektionsvorrichtung und Verfahren zur Durchlichtinspektion von Behältern |
| US10012598B2 (en) | 2015-07-17 | 2018-07-03 | Emhart S.A. | Multi-wavelength laser check detection tool |
| FR3056297B1 (fr) * | 2016-09-19 | 2018-10-05 | Tiama | Dispositif pour l'inspection optique de recipients en verre en sortie de machine de formage |
| US10422755B2 (en) * | 2016-12-07 | 2019-09-24 | Applied Vision Corporation | Identifying defects in transparent containers |
| DE102017008406B4 (de) * | 2017-09-07 | 2023-07-20 | Heuft Systemtechnik Gmbh | Inspektionsvorrichtung und ein Verfahren mit Farbbeleuchtung |
| DE102019205653A1 (de) * | 2019-04-18 | 2020-10-22 | Krones Ag | Durchlichtinspektionsvorrichtung und Durchlichtinspektionsverfahren zur Seitenwandinspektion von Behältern |
| DE102019208299A1 (de) * | 2019-06-06 | 2020-12-10 | Krones Ag | Verfahren und Vorrichtung zur optischen Inspektion von Behältern |
| DE102019208295A1 (de) * | 2019-06-06 | 2020-12-10 | Krones Ag | Verfahren und Vorrichtung zur optischen Inspektion von Behältern |
| DE102019208296A1 (de) * | 2019-06-06 | 2020-12-10 | Krones Ag | Verfahren und Vorrichtung zur optischen Inspektion von Behältern |
| FR3132352B1 (fr) * | 2022-01-28 | 2024-12-13 | Tiama | Procédés et systèmes opto-informatiques d’inspection en lumière traversante d’un récipient en verre |
-
2020
- 2020-07-29 FR FR2008027A patent/FR3113131B1/fr active Active
-
2021
- 2021-07-22 US US18/016,698 patent/US20230288343A1/en not_active Abandoned
- 2021-07-22 EP EP21752580.7A patent/EP4189370A1/fr not_active Withdrawn
- 2021-07-22 CN CN202180066790.1A patent/CN116348756A/zh active Pending
- 2021-07-22 WO PCT/FR2021/051373 patent/WO2022023652A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3113131B1 (fr) | 2023-03-31 |
| FR3113131A1 (fr) | 2022-02-04 |
| US20230288343A1 (en) | 2023-09-14 |
| CN116348756A (zh) | 2023-06-27 |
| WO2022023652A1 (fr) | 2022-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3034992B1 (fr) | Projecteur de lumière structurée et scanner tridimensionnel comportant un tel projecteur | |
| KR102305382B1 (ko) | 웨이퍼 검사 | |
| EP2082216A2 (fr) | Procede et dispositif pour detecter des defauts a faible et fort contrastes dans des objets transparents ou translucides | |
| CA2859598A1 (fr) | Dispositif d'analyse des defauts d'aspect d'un substrat transparent | |
| FR3061538A1 (fr) | Dispositif d'eclairage pour un vehicule, combinant deux sources lumineuses | |
| EP1817574B1 (fr) | Procede et dispositif d'eclairage pour determiner la presence de defauts sur la surface de la bague d'un recipient | |
| FR2941067A1 (fr) | Controle de defauts optiques dans un systeme de capture d'images | |
| FR2613075A1 (fr) | Dispositif de controle optique d'un ruban | |
| EP3421875A1 (fr) | Module lumineux comportant un element optique de correction de champ | |
| EP2927051B1 (fr) | Système d'éclairage à couleur adaptative | |
| EP3956652B1 (fr) | Système et procédé de détection de vitrocéramique | |
| JP5890953B2 (ja) | 検査装置 | |
| FR3084544A1 (fr) | Caracterisation optique d'un coefficient de bifacialite de module photovoltaique bifacial | |
| FR2883645A1 (fr) | Systeme d'imagerie pour projecteur et projecteur correspondant | |
| FR2737560A1 (fr) | Procede et dispositif pour quantifier in situ, par reflectometrie, la morphologie d'une zone localisee lors de la gravure de la couche superficielle d'une structure a couches minces | |
| EP4189370A1 (fr) | Dispositif et procede d'inspection en transmission de récipients comportant au moins une source de lumière à diode électroluminescente | |
| WO2019025745A1 (fr) | Procede de controle non destructif d'une piece aeronautique et systeme associe | |
| WO2021123459A1 (fr) | Système de projection de faisceaux lumineux | |
| WO2022129721A1 (fr) | Procede d'inspection d'une surface d'un objet | |
| WO2023094332A1 (fr) | Dispositif optique de projection à trois lentilles | |
| EP1943530B1 (fr) | Dispositif d'analyse d'un circuit integre | |
| WO2021019136A1 (fr) | Dispositif d'inspection d'une surface d'un objet | |
| FR3059156B1 (fr) | Module de detection optique | |
| JP2007085964A (ja) | 透明膜の測定システムおよび測定方法 | |
| WO2024094536A1 (fr) | Dispositif d'éclairage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20230118 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Effective date: 20250114 |