Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
  • B60C13/001—Decorating, marking or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/72—Side-walls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
  • B60C11/24—Wear-indicating arrangements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
  • B60C13/02—Arrangement of grooves or ribs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes

Definitions

• the present invention relates to a tire for a motor vehicle having a tread and a sidewall, said tire comprising on the tread and / or said sidewall a marking.
• the tires have markings on their tread and / or their sidewall which are increasingly made from source images that are printed and which are in particular photographs, or works of art. artists, graphic designers.
• the source images are composed of different shades of color that can be transposed into different gray levels.
• WO 2013/1 13526 discloses a tire having a marking on a sidewall.
• This marking consists of a realistic representation of a photograph. More particularly, the marking is composed of a plurality of adjacent ribs having a generally triangular section. The space between two adjacent ribs is filled with a complementary material to a certain level of filling. The level of filling of the complementary material locally determines a gray level of the marking.
• the object of the invention is to propose a solution for producing on a tire complex markings, of photographic representation type, in a simpler and more economical manner than in the prior art. DEFINITIONS
• Rubber material means a diene elastomer, that is to say in known manner an elastomer derived from at least in part (ie homopolymer or copolymer) of monomers dienes (monomers carrying two carbon-carbon double bonds, conjugated or not).
• tread of a tire means a quantity of rubber material delimited by lateral surfaces and by two main surfaces, one of which, called a tread surface, is intended to come into contact with a road surface. when the tire is rolling.
• sidewall of a tire means a side surface of the tire disposed between the tread of the tire and a bead of the tire.
• “Strand” means a filamentary element whose height is at least equal to 2 times the diameter of a disc of the same area as the average section of the strand.
• Linear pattern means one or more geometric elements protruding with respect to the tire such as a strand or a lamella, and / or a plurality of geometric elements recessed relative to the tire such as a hole or a streak .
• linear pattern “come from material with the tire” is meant that this pattern is in the same material as the tire.
• the luminosity is expressed according to a scale ranging from 0 to 100 according to the color model L * a * b * established by the CIE (International Commission of Lighting) in 1976.
• the value 100 represents the white or the reflection total; the value 0, black or total absorption.
• a * and b * are chromaticity coordinates.
• the color model L * a * b * thus defines a chromaticity diagram.
• a * and b * indicate the direction of the colors: + a * goes to red, -a * to green, + b * to yellow, and -b * to blue.
• the center of the diagram is achromatic. As the values a * and b * increase, and as we move away from the center of the diagram, the saturation increases.
• the invention relates to a rubber tire comprising a tread and a sidewall, said tire comprising on said tread and / or said sidewall a marking.
• the marking is formed by a plurality of linear patterns integral with the tire. These patterns are parallel to each other and are spaced apart by a pitch P less than or equal to 1 mm.
• Each linear pattern has a length L. All or part of the linear patterns have in their length L one or more variation (s) of width so as to define the marking.
• the invention thus proposes to carry out a complex marking on a tire.
• This marking is made from a plurality of linear patterns, these patterns having in their length one or more variation (s) of width. Depending on the given width variations, it is possible to give the marking a certain definition and, for example, it is possible to reproduce with sufficient precision the details of a photograph. Since the patterns are formed directly on the tire, it is not necessary to report a complementary material as in the prior art. The realization of the complex marking on the tire is thus simplified.
• the tire may further comprise one or more additional characteristics from the following: [17]
• the marking is a representation of a photograph. [18] Thanks to the invention, it is thus possible to perform complex markings, giving the tire a certain visual attractiveness.
• the linear patterns are arranged obliquely in the marking. [20] This makes it possible to obtain an aesthetic effect of marking on the tire. Note that these linear patterns can follow the curvature of the tire surface.
• a linear pattern is composed of one or more protruding elements or one or more recessed elements with respect to the tread and / or said sidewall.
• all or part of the protruding elements are strands distributed in the linear pattern at a density of at least one strand per square millimeter (mm 2 ), each strand having a mean cross-section between 0.0005 mm 2 and 1 mm 2 .
• all or part of the protruding elements are slats substantially parallel to each other, the pitch of the slats in the linear pattern being at most equal to 0.5 mm, each slat having an average width. between 0.02 mm and 0.25 mm.
• all or part of the protruding elements form side parallelepipeds between 0.05 mm and 0.5 mm, with a height of between 0.05 mm and 0.5 mm, the distance between two adjacent parallelepipeds in the linear pattern being between 0.05 mm and 0.5 mm.
• the hollow elements form openings on the tread and / or the sidewall and the linear pattern comprises a plurality of openings, these openings being distributed in the linear pattern according to a density at least equal to one opening per square millimeter (mm 2 ), these openings having equivalent diameters of between 0.01 mm and 1.2 mm.
• FIG. 2 diagrammatically represents a perspective view of a portion of a tire comprising a tread and a sidewall, said tread comprising a marking according to the invention according to a second embodiment
• FIG. 3 diagrammatically represents an enlarged view of the marking of FIG. 1 or FIG.
• FIG. 2 said marking being composed of a plurality of strips each comprising a linear pattern of variable width locally;
• Figure 4 shows the plurality of bands of Figure 3 without the linear patterns;
• Fig. 5 shows a band of Fig. 4, said band being composed of a plurality of parts;
• FIG. 6 represents a part of a band of FIG. 5, said part comprising a linear pattern of variable width;
• FIG. 7 represents a linear pattern of FIG. 3 according to a first nonlimiting variant of a first embodiment of the linear pattern according to which the linear pattern is composed of protruding elements;
• FIG. 8 represents a linear pattern of FIG. 3 according to a second nonlimiting variant of a first embodiment of the linear pattern according to which the linear pattern is composed of protruding elements;
• FIG. 9 represents a linear pattern of FIG.
• FIG. 10 represents a linear pattern of FIG. 3, according to a second embodiment of the linear pattern according to which the linear pattern is composed of hollow elements
• Fig. 11 is an enlarged view of a recess of a recessed member of Fig. 10
• Figure 12 is a flowchart of a method of making a marking such as the marking of Figure 3 on a tire from a source image
• Fig. 13 is a flowchart of the method of Fig. 12, said method comprising additional steps.
• FIG. 1 and 2 is shown a portion of the tire 1 having a tread 2 and a sidewall 3, said tire 1 comprising on the tread 2 and / or said flank 3 a marking 4.
• said marking 4 represents a unit of meaning which is here an eye.
• Figure 1 shows a portion of the tire 1 having a tread 2 and a sidewall 3 according to a first non-limiting embodiment. According to this mode, the flank 3 comprises on its surface 30 the marking 4.
• Figure 2 shows a portion of the tire 1 having a tread 2 and a sidewall 3 according to a second non-limiting embodiment.
• the tread 2 has grooves 21 (also called tread patterns) and a tread surface 20 intended to come into contact with the ground. According to this mode, the tread 2 has on its tread 20 the marking 4.
• said marking 4 is composed of a plurality of strips 40, each strip 40 comprising a linear pattern 41 whose Lt width can vary locally.
• all or part of the linear patterns 41 have in their length one or more variations of width so as to define said marking 4.
• the variation of said width can reproduce levels of gray Nx.
• Marking 4 seen by the observer thus has variations of gray.
• the width Lt of a linear pattern 41 varies with respect to the median line of a strip 40.
• the linear patterns 41 are arranged obliquely in the marking 4. This allows to determine the aesthetics that we want to give the marking. In other non-limiting embodiments, it is conceivable to have linear patterns 41 horizontal or vertical. [36] Note that the linear patterns 41 may have a certain curvature as they follow the surface of the sidewall 3 or the tread 2. They thus conform to the shape of the tire 1.
• a pattern 41 is linear throughout the marking 4. It extends over the entire marking 4. Thus, it extends from a first limit of the marking 4 to a second limit , the boundaries of the marking 4 being defined by the four sides of said marking 4 in the example taken from FIG. 3. In the case where the linear pattern is vertical or horizontal, the first limit is opposite the second limit.
• Figure 4 illustrates the strips 40 of Figure 3 without the linear patterns 41.
• the strips 40 are arranged obliquely in the marking 4 as the linear patterns 41 illustrated in FIG.
• the width Lb of a strip is between 0.03mm and 1mm. This allows a marking at the industrial level in which the object, here the unity of meaning, is visible. Indeed, in the case where said width Lb would be smaller, an observer of the tire would no longer perceive the details of the marking (here of the unity of meaning which is an eye), and therefore, could not know what the marking represents (unity of meaning, or other abstract object). It is the same in the case where said width is too large.
• the width Lb is equal to 0.1 mm. This makes it possible to have a good compromise between the definition of the marking obtained, seen by an observer at a minimum distance of 1m, and its resistance to mechanical aggression.
• FIG. 5 illustrates a band of FIG. 4. Said band 40 is composed virtually of a plurality of parts 50, a part 50 defining a determined gray level Nx which is produced by the local variation of the width Lt of said Linear pattern 41 in said portion 50. Such a portion 50 is shown in Figure 6.
• the linear pattern 41 varies within said portion 50 and includes a width of size Ltl on one side of the part 50 which is different from the size Lt2 on the other side of the part in the example of FIG. 6.
• the width Lt varies around a center line 43 of the strip 40 (and therefore part 50).
• a gray level Nx is equal to the ratio between the area of said linear pattern 41 in the portion 50 comprising said linear pattern 41, divided by the total area of said portion 50.
• the surface proportion of the linear pattern 41 relative to the surface of all of the portion 50 which defines a level of gray Nx is equal to the ratio between the area of said linear pattern 41 in the portion 50 comprising said linear pattern 41, divided by the total area of said portion 50.
• width Lt may vary from one part 50 to another or within one part 50. It may be noted that one or more linear patterns 41 may have a constant width Lt all along the strip 40 while the other linear patterns 41 have a width Lt which varies locally.
• a linear pattern 41 is composed of one or more protruding elements or one or more recessed elements with respect to the tread 3 and / or said sidewall 2.
• a linear pattern 41 (such as strands or slats) is integral with the tread and / or said flank 3, namely it is made in the same rubber material as said tread and / or said sidewall. This produces a marking without adding another material.
• a linear pattern 41 contrasts with the tread 2 and / or the sidewall 3 so that the marking 4 is clearly visible by an observer of the tire.
• the protruding elements are presented hereinafter.
• the effect of these elements protruding is to "trap" a large amount of incident light rays that meet the linear pattern 41.
• the linear pattern 41 allows to obtain, from on the one hand, a visual "velvet” type because the protruding elements absorb the light and thus make the linear patterns 41 black and therefore the marking 4 more in contrast with the tire, and secondly, a touch of type "velvet", said elements in protuberance providing a marking 4 pleasant to the touch.
• Figure 7 illustrates a portion of the linear pattern 41 according to a first non-limiting embodiment of the first embodiment.
• all or part of the protruding elements are strands 8 distributed in the linear pattern 41 in a density at least equal to one strand per square millimeter (mm 2 ), each strand having an average section S of between 0.0005 mm 2 and 1 mm 2 .
• the average section of each strand corresponds to the average of sections S measured at regular intervals from the base of the strand.
• the strands 8 have a generally conical shape with a section decreasing in the height Hb of these strands.
• Figure 8 illustrates part of the linear pattern 41 according to a second non-limiting embodiment of the first embodiment.
• all or part of the elements in protrusion are slats 9 substantially parallel to each other, the pitch P of the slats in the linear pattern 41 being between 0.1 mm and 0.5 mm, each slat 9 having an average width between 0.02 mm and 0.25 mm.
• the average width corresponds to the average of the widths 1 measured at regular intervals in the height H1 of the lamella, the height of each lamella being between 0.05 and 0.5 mm.
• the linear pattern 41 is composed only of a single plate 9 whose width may vary locally.
• the linear pattern 41 comprises a combination of strands 8 and slats 9.
• Figure 9 illustrates a portion of the linear pattern 41 according to a third non-limiting embodiment of the first embodiment.
• all or part of the protruding elements form parallelepipeds 10 having a side C of between 0.05 mm and 0.5 mm, with a height Hp of between 0.05 mm and 0.5 mm, the distance Dp between two adjacent parallelepipeds 10 in the linear pattern being between 0.05 mm and 0.5 mm.
• the linear pattern 41 comprises a combination of the raised elements 8, 9 and 10, or 8 and 10, or 9 and 10 described above.
• the linear pattern 41 comprises a plurality of recessed elements 12 with respect to the surface where said linear pattern 41 is located, namely the surface 30 of the sidewall 3 in the case illustrated in FIG. 1 or the tread surface 20 of the tread 2 in the case illustrated in Figure 2.
• the hollow elements 12 also called holes
• the linear pattern 41 comprises a plurality of openings 13 in the surface, said openings 13 being distributed in the linear pattern 41 in a density at least equal to one opening per square millimeter (mm 2 ) and having on the surface diameters Dt equivalents of between 0.01 mm and 1.2 mm.
• the openings 13 extend in the depth of the surface to form cavities 14.
• all or part of the cavities 14 has a depth of at least 0.1mm. In a non-limiting embodiment variant, all or part of the cavities 14 has a depth of between 0.2 mm and 0.6 mm. In this way, it is ensured that a large quantity of incident light rays which meets the texture 5 is trapped by the linear pattern 41 and, since the depth of the cavities is limited, it is also avoided to degrade the mechanical strength of the surface 20 and / or 30.
• FIG 10 illustrates the linear pattern 41 according to a non-limiting variant of this second embodiment.
• all or part of the cavities 14 are in the form of cones which extend in the depth of the surface 20 and / or 30 and open on the surface forming circular openings 13.
• the cavities 13 thus have a section which decreases in the depth of the surface. In this way, the contrast of the linear pattern 41 is improved with respect to the tread and / or the sidewall.
• the openings 13 of the cavities 14 do not touch each other.
• the openings 13 are separated by intermediate zones 15.
• the openings 13 are evenly distributed over all or part of the surface 20 and / or 30 so that the distance d between each opening of the linear pattern 41 is generally similar.
• FIG. 11 is a zoom on a cavity 14 of a hollow element 12 of FIG. 10.
• all or part of the cavities has at least one wall 16 which, according to a view in FIG. section, forms an angle ⁇ between 10 ° and 60 ° with respect to a direction Z perpendicular to the linear pattern 41.
• the recessed elements are composed of a plurality of streaks (not shown). extending in the depth of the surface 20 and / or 30.
• a linear pattern 41 may be composed of a plurality of streaks of locally variable width or a linear pattern 41 is composed of only one streak (not illustrated) whose width may vary locally.
• a white color is obtained. In this case, the white color is achieved by a smooth surface (that of the tread 2 and / or the sidewall 3) which has a very low surface roughness Ra parameter.
• the arithmetic mean-deviation parameter Ra representative of the surface roughness is less than 30 ⁇ . This smooth surface returns a maximum of incident light. The amount of light returned by all or part of a strip 40 of white color is thus maximized.
• the marking 4 on tire 1 made of rubber material comprising a tread 2 and a sidewall 3 is made from a source image 4 'by means of an MTH manufacturing method illustrated in FIGS. 12 and 13.
• the source image 4 ' is an image in the form of a computer file such as files of type bitmap or jpeg (also called digital image).
• its resolution is generally quite high, for example of the order of 3000 pixels by 3000 pixels.
• the MTH production method comprises: a first processing of the source image 4 'into a target image 4 "composed of a plurality of lines 42, all or part of the features presenting in their length one or more width variations Lt so as to define said source image 4 '(illustrated step F 1 (4', 4 ", 42, Lt));
• the first treatment of the source image 4 ' will make it possible to obtain a target image 4 "composed of a plurality of lines 42 corresponding to the linear patterns 41 to be made on the tire 1, all or part of the lines 42 presenting in their length one or more width variations Lt so as to define said source image 4 '
• the bands 40 of the target image 4 are also defined. These strips 40 will thus allow the distribution and positioning of the lines 42 and thus the distribution and positioning of the linear patterns 41 in the marking 4 and help the industrial realization of said marking 4.
• linear patterns 41 When selecting one or more linear patterns 41, one selects the protuberance or recessed elements previously seen.
• the selected linear patterns 41 will thus be made on the marking 4 as a function of the lines 42 of the target image 4 "and in particular according to their positioning (oblique, horizontal, vertical), and their variation of their width.
• the etching of the marking 4 is in a first embodiment carried out on a mold. In a second embodiment, it is carried out directly on said tire 1. Thus, the etching of the marking 4 is performed before or after firing of the tire 1. Said etching comprises the etching of a plurality of linear patterns 41 to define the marking 4.
• the laser engraving machine M is in a non-limiting example a pulsed laser which comprises in a non-limiting example a power of 50 W and a speed of 1000mm / s and operates at a frequency of 50kHz.
• the method further comprises defining a pitch Pa between two linear patterns 41 which is set on the laser engraving machine M (SELEC illustrated (Pb)).
• the pitch Pa is defined as input parameter of the machine M.
• the pitch Pa is between 0.2mm and 1mm. This allows a realization at the industrial level. It will be noted that the smaller the pitch Pa, the more accurate the marking 4 will be.
• the pitch between two linear patterns Pa (also called etching) corresponds to the width Lb of a strip 40.
• a pitch Pa between two patterns adjacent linear lines 41 is defined with respect to a median 43 passing through each linear pattern 41 as illustrated in FIG.
• This additional step can be performed at any time in the production method, for example after the first treatment.
• the method MTH further comprises a transformation of the source image 4' in color into a source image 4 'in levels gray (step shown TRANS_CO (4 ', Nx) in FIG. 13).
• MTH further includes trimming the source image 4 '. This makes it possible to better highlight the unity of meaning in the source image 4 'once it is transferred onto the tire (illustrated step DETOUR (4') in FIG. 13).
• the method further comprises a second processing (step illustrated F2 (4 ', p, Nx, L *) in FIG. 13) in which parameters p of the source image 4 are adjusted such that at least five percent of the Nx gray levels of said source image 4 'have a brightness value L * of less than 20 and at least five percent of the gray levels Nx of said 4 'source image have a brightness value L * greater than 80.
• p parameters are in a non-limiting example contrast and / or brightness and / or the gamma parameter.
• the source image 4 ' is adjusted so as to obtain a marking 4 on the tire which is closest to the source image 4', in particular thanks to the adjustment of the gamma parameter (also called gamma correction).
• the gamma correction can be controlled by means of a histogram of the pixel values of the source image 4 '.
• the rubber components of the tires are typically anthracite gray in color.
• the maximum amplitude of contrast on these materials is low because the maximum brightness is of the order of 25. This step therefore maximizes the contrast made on the tire for an observer, on the support that is the tire with its rubber material. The loss of the maximum amplitude of contrast imposed by the material is thus minimized.
• Adjusting the contrast parameter makes it easy to see the difference between dark gray levels and light gray levels.
• This second treatment makes it possible to obtain a marking 4 on a tire which has a luminosity L * of between 8 and 25.
• L * luminosity of between 8 and 25.
• the lightest areas of the marking 4 come close to the brightness 25 while the darkest areas marking 4 are close to the brightness 8.
• the step of transforming the color image (shown in dotted lines) is performed before the second processing.
• the clipping step (shown in dotted lines) can be done before or after the second treatment.
• the method MTH further comprises an adaptation of the resolution RI of said source image 4 'as a function of the desired resolution R2 of the marking 4 on said tire 1 and a step Pa between two linear patterns 41 (step shown in dotted line ADAPT (4 ', RI, 4, R2, Pa) in Figure 13).
• ADAPT 4 ', RI, 4, R2, Pa
• the resolution RI is the number of pixels that make up the source image 4 'in height and width.
• Resolution R2 is the number of millimeters that make up the marking 4 in height and in width on the tire 1, namely the space in millimeters on the tire 1 dedicated to said marking 4.
• the adaptation of said resolution RI according to the resolution R2 comprises the sub-components. following steps :
• the resolution R2' is calculated in pixels of a digital image corresponding to the resolution R2 in millimeters of the image target 4 to be made on the tire 1.
• the resolution R2 ' is equal to said resolution R2 divided by said pitch Pb.
• the resolution RI of the source image 4' is modified.
• the resolution RI which was at the beginning of 3000 * 3000pixels is modified so as to obtain a new resolution RI equal to 100 * 100pixels.
• the gray level Nx defined by a pixel in the reduced source image 4 ' is equal to the gray level Nx defined by a square of 30 * 30pixels in the source image 4' obtained just after the second processing in the illustrated example of Figure 13.
• a first step 1) the color source image 4 'is transformed into a source image 4' comprising several levels of gray Nx.
• a third step 3 the parameters of said source image 4 'are adjusted.
• the resolution RI of the source image 4 ' is adapted according to the desired resolution R2 of the marking 4 to be made on the tire 1. This step comprises:
• a fifth step 5 the source image 4 'whose resolution RI has been modified to process the target image 4 "composed of the plurality of bands 40 is processed.
• the bands 40 and the lines are thus created.
• 42 of width Lt locally variable in said bands 40 so as to define the object of the source image 4 'and therefore the different levels of gray Nx of the source image 4' whose resolution has been modified.
• the laser engraving machine M is adjusted with the value of the pitch Pa, namely here with the value of a width Lb of a strip 40.
• a seventh step 7 the protuberance and / or recessed elements constituting the linear patterns 41 are selected.
• the machine M realizes the linear patterns
• the places where the band 40 does not have a linear pattern 41 correspond to the white color.
• the white color is produced by the smooth surface of the tread and / or the side on which the marking 4 is located, the machine M does not engrave these places but only engraves the linear patterns 41.
• the marking 4 which is close to the source image 4 'so that an observer of the tire will see a marking of sufficient contrast to recognize the object of the marking.
• the marking 4 is composed of a plurality of gray levels which form between them a contrast which limits the final contrast obtained that the observer can see at a distance of lm minimum.
• the slats 9 of Figure 8 may be discontinuous. They have a flat part between them. In addition, they may have section differences between them. In addition, the slats may have curvatures or angles, especially in their length. They can also be of variable length.
• the openings 13 of Figure 10 may have the shape circular, square, or polygonal (for example hexagonal) and the corresponding cavities 14 a cylindrical shape, parallelepipeds, or even polygons. With these two last structures (square or polygonal), it is possible to more easily organize the openings 13 relative to each other so as to limit the area of the intermediate zones 15 between these openings. With such forms of openings, it is possible to arrive more easily at substantial rates of occupancy of the openings.
• the tread 2 of the tire and / or the sidewall 3 may each comprise one or more markings 4.
• a linear pattern 41 is achieved by simple disbursement performed by laser.
• the disbursement has a depth of between 0.1 and 0.5 mm.
• a linear pattern 41 may vary locally in width with respect to a line extending along a strip 40, said line being different from the center line of said strip. 40.
• the marking 4 may comprise linear patterns which do not extend over the entire marking 4, namely which do not extend from a limit of the marking to a another limit.
• the linear pattern extending from one marking limit to another limit exhibits interruptions.
• the linear pattern is discontinuous.
• the discontinuity pitch varies continuously in order to adapt to the curvatures of the tire.
• the method of performing the marking comprises:
• the marking comprising a plurality of linear patterns.
• the method further includes a second process in which parameters of the source image are adjusted such that at least five percent of the gray levels of said source image have a value. less than 20 and at least five percent of the gray levels of said source image have a brightness value greater than 80.
• the method further comprises an adaptation of the resolution of said source image according to the desired resolution of said marking on said tire and a pitch between two linear patterns.
• the marking is performed by laser etching by means of a laser engraving machine on a mold or directly on said tire.

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• 2014
  • 2014-07-11 FR FR1456698A patent/FR3023509B1/fr active Active
• 2015
  • 2015-07-10 JP JP2017501375A patent/JP2017520463A/ja not_active Abandoned
  • 2015-07-10 US US15/325,677 patent/US20170157995A1/en not_active Abandoned
  • 2015-07-10 EP EP15734417.7A patent/EP3166801A2/de not_active Withdrawn
  • 2015-07-10 BR BR112016031033-0A patent/BR112016031033A2/pt not_active Application Discontinuation
  • 2015-07-10 WO PCT/EP2015/065864 patent/WO2016005573A2/fr active Application Filing
  • 2015-07-10 CN CN201580037869.6A patent/CN106536230B/zh active Active

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