• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    To improve legibility of a concave mark provided on a surface of a sidewall portion without using a rubber of a different color. A concave mark 4 is provided on a surface 2s of a sidewall portion 2. A bottom surface 6 of the concave mark 4 is divided into a shadow area (Ya) and a remaining main area (Yb). The shadow area (Ya) is an area along a shadow wall portion 8 that is in the shadow of a wall portion 7 of the concave mark 4 when light is shed to the concave mark 4 from a direction. The shadow area (Ya) has a plurality of minute protrusions 10.
    公开号:EP3693191A1
    申请号:EP20152690.2
    申请日:2020-01-20
    公开日:2020-08-12
    发明作者:Koichi Nakajima
    申请人:Sumitomo Rubber Industries Ltd；
    IPC主号:B60C13-00
    专利说明:
    [0001] The present invention relates to a tyre with improved legibility of a concave mark provided on a surface of a sidewall portion. [Background Art]
    [0002] On the surface of the sidewall portion of the tyre, marks that are characters, symbols, and the like for representing the manufacturer name, brand name, size of the tyre, and the like are formed. Conventionally, such a mark is formed in a convex shape so as to protrude from the surface of the sidewall portion in order to improve its legibility. However, the convex mark has a large air resistance, therefore, it has an adverse effect on fuel efficiency.
    [0003] Therefore, in Patent Document 1 below, it has been proposed to form the mark in a concave shape lower than the surface of the sidewall portion. [Prior art document][Patent Document]
    [0004] [Patent Document 1]Japanese Patent Application Publication No. 2013-129233 [summary of the Invention][Problems to be solved by the Invention]
    [0005] However, in the case of a concave mark, it cannot be made deep enough due to the limitation of the rubber thickness in the sidewall portion, therefore, it has inferior legibility. In the Patent Document 1, the deterioration of legibility is suppressed by disposing a rubber of a different color on the inner surface of the concave mark. However, the use of a rubber of a different color makes the tyre formation process complicated, which leads to disadvantages in production efficiency and cost.
    [0006] An object of the present invention is to provide a tyre capable of increasing the legibility of the concave mark provided on the surface of the sidewall portion without using a rubber of a different color. [Means for solving the Problems]
    [0007] The present invention is a tyre including A tyre comprising a concave mark provided on a surface of a sidewall portion and recessed from the surface, wherein a bottom surface of the concave mark is divided into a shadow area, which is an area along a shadow wall portion that is in the shadow of a wall portion of the concave mark when light is shed to the concave mark from a direction, and a main area other than the shadow area, and the shadow area has a plurality of minute protrusions.
    [0008] In the tyre according to the present invention, it is preferred that in the shadow area, an area width (WA) from the shadow wall portion is larger than a depth (H) of the concave mark.
    [0009] In the tyre according to the present invention, it is preferred that the direction is a diagonal direction when the concave mark is viewed from its front with an outer side in a tyre radial direction as the upper side.
    [0010] In the tyre according to the present invention, it is preferred that the direction is the diagonal direction from an obliquely upper side as it goes from the radially outer side to the radially inner side.
    [0011] In the tyre according to the present invention, it is preferred that the minute protrusions are rib-shaped protrusions, in which widths thereof are decreased toward top ends thereof, arranged in parallel with each other.
    [0012] In the tyre according to the present invention, it is preferred that the rib-shaped protrusions have maximum widths of 50 µm or more and 1000 µm or less, protruding heights of 50 µm or more and 1000 µm or less, and distances of 100 µm or more and 1000 µm or less between centers of the rib-shaped protrusions adjacent to each other.
    [0013] In the tyre according to the present invention, it is preferred that the rib-shaped protrusions extend in the same direction as the direction.
    [0014] In the tyre according to the present invention, it is preferred that the minute protrusions are columnar protrusions.
    [0015] In the tyre according to the present invention, it is preferred that the columnar protrusions have maximum diameters of 50 µm or more and 1000 µm or less, protruding heights of 50 µm or more and 1000 µm or less, and distances of 100 µm or more and 1000 µm or less between centers of the columnar protrusions adjacent to each other.
    [0016] In the tyre according to the present invention, it is preferred that the columnar protrusions have truncated conical shapes having smaller diameters on a side of upper ends thereof.
    [0017] In the tyre according to the present invention, it is preferred that the columnar protrusions have concave portions at their top ends.
    [0018] In the tyre according to the present invention, it is preferred that depths of the concave portions are 15% or more of protruding heights of the columnar protrusions. [Effects of the Invention]
    [0019] In the present invention, as described above, the bottom surface of the concave portion is divided into the shadow area and the remaining main area. The shadow area means the area along the shadow wall portion that is in the shadow of the wall portion of the concave mark when light is shed to the concave mark from the direction. And by providing a plurality of the minute protrusions, the absorption rate of the light is increased, therefore, it is possible that the shadow area (Ya) is made to look darker than the main area.
    [0020] Thereby, contrast is given to the bottom surface of the concave mark, therefore, it is possible that the shadow area is made to look like the shadow made by the wall portion when light is shed from the direction. Further, it is possible that the shadow is made to look like a part of the wall portion of the concave mark. And by these optical illusions, it is possible that the concave mark is made to look deeper than its actual depth, therefore, the legibility can be increased. [Brief Description of the Drawings]
    [0021] [Figure 1] A side view of one of sidewall portions of a tyre of an embodiment of the present invention.[Figure 2A] A front view of a concave mark.[Figure 2A] A perspective view of the concave mark.[Figure 3] A cross-sectional view of the concave mark.[Figure 4] An enlarged cross-sectional view showing a shadow area along with minute protrusions.[Figure 5] A partial perspective view showing an example of rib-shaped protrusions.[Figure 6A] A partial plan view showing an arrangement of columnar protrusions.[Figure 6B] A cross-sectional view showing the arrangement of the columnar protrusions.[Figure 7A] A front view of the concave mark when the direction is a diagonal direction from an obliquely upper left side.[Figure 7B] A perspective view of the concave mark when the direction is the diagonal direction from the obliquely upper left side.[Figure 8A] A perspective view showing the columnar protrusion according to another embodiment.[Figure 8B] A perspective view showing the columnar protrusion according to yet another embodiment. [Mode for carrying out the invention]
    [0022] An embodiment of the present invention will now be described in conjunction with accompanying drawings.
    [0023] As shown in Fig. 1, a tyre 1 of the present invention is provided with a mark 3 showing a tyre manufacturer name, brand name, size, and the like on at least one of sidewall portions 2.
    [0024] The mark 3 is composed of at least one concave mark 4. The concave mark 4 is a character, a symbol, a figure or the like, and it means the smallest unit constituting the mark 3. In this embodiment, an example is shown in which the mark 3 (a brand name, for example) that is a character string of "ALKE" is formed by four concave marks 4 that are "A", "L", "K", and "E".
    [0025] As shown in Figs. 2A and 2B, the concave mark 4 is formed as a mark recessed in a step shape from a surface 2s of the sidewall portion 2. That is, the concave mark 4 includes a bottom surface 6 and a wall portion 7 that rises from the bottom surface 6 and forms the contour of the concave mark 4.
    [0026] The bottom surface 6 is divided into a shadow area (Ya) and a main area (Yb) other than the shadow area (Ya). Here, the shadow area (Ya) means a width area on the bottom surface 6 along a shadow wall portion 8. Further, the shadow wall portion 8 means a portion of the wall portion 7 that is in the shadow when light is shed to the concave mark 4 from an arbitrary direction (F). In this embodiment, an example is shown in which light is shed from the upper left direction in a front view. As a result, the light is blocked in portions of the wall portion 7 located on the left side and the upper side of the bottom surface 6 (shown in gray for convenience), therefore, these portions are in the shadow. That is, the portion of the wall portion 7 where the light is blocked and thus in the shadow is the shadow wall portion 8. Further, the other portion of the wall portion 7 is a bright wall portion 9 that is exposed to light.
    [0027] And a plurality of minute protrusions 10 are formed in the shadow area (Ya) positioned along the shadow wall portion 8. In Figs. 2A and 2B, an example is shown in which the minute protrusions 10 are rib-shaped protrusions 12 described later, and, for the sake of convenience, only the ridgelines of the rib-shaped protrusions 12 are shown in the figures. It should be noted that the main area (Yb) is formed of a flat and smooth surface that is substantially free of unevenness.
    [0028] It is possible that the minute protrusions 10 increase an absorption rate of the light, therefore, it is possible that the shadow area (Ya) is made to look darker than the main area (Yb).
    [0029] As a result, contrast (light and dark) is given to the bottom surface 6 of the concave mark 4, therefore, it is possible that the shadow area (Ya) is made to look like the shadow made by the wall portion 7 when light is shed from the direction (F). Further, it is possible that this shadow is made to look like a part of the wall portion 7 of the concave mark 4. And by these optical illusions, it is possible that the concave mark 4 is made to look deeper than its actual depth, therefore, the three-dimensional effect is increased, thereby, the legibility can be increased.
    [0030] Here, as shown in Fig. 2A, it is preferred that the direction (F) is a diagonal direction (F1) when the concave mark 4 is viewed from its front with an outer side in a tyre radial direction as the upper side. In particular, it is preferred that the direction (F) is the diagonal direction (F1) from the obliquely upper side going from the radially outer side to the radially inner side. As a result, it is possible that the three-dimensional effect given to the concave mark 4 is further increased. The front view means a view in which the concave mark 4 is viewed from its front with the radially outer side as the upper side. Further, the diagonal direction (F1) means a direction having an angle of 20 degrees or less, preferably 10 degrees or less with respect to a reference line (x), when a diagonal line of a parallelogram (K) having the smallest area among the parallelograms surrounding the concave mark 4 is taken as the reference line (x).
    [0031] In Figs. 2A and 2B, an example is shown in which the direction (F) is the diagonal direction (F1) from the upper left side among the diagonal directions (F1) from the diagonally upper side. However, as shown in Figs. 7A and 7B, the direction (F) may be the diagonal direction (F1) from the upper right side.
    [0032] As conceptually shown in Figs. 3 and 4, it is preferred that an area width (WA) of the shadow area (Ya) from the shadow wall portion 8 is larger than a depth (H) of the concave mark 4. Thereby, it is possible that the concave mark 4 is made to look deeper. The area width (WA) is a width in a direction perpendicular to a length direction of the shadow wall portion 8. Although the upper limit of the area width (WA) is not particularly limited, it is preferred that it is 4.0 times or less the depth (H) for the purpose of giving a three-dimensional effect. Further, although the depth (H) is not particularly limited, it is generally 0.3 mm or more and 1.0 mm or less due to the restriction of the rubber thickness of the sidewall portions 2.
    [0033] As the minute protrusions 10, the rib-shaped protrusions 12 extending in parallel with each other can be suitably employed. It is preferred that these rib-shaped protrusions 12 each have a triangular or trapezoidal cross section, taken perpendicular to a length direction thereof, in which a width is decreased toward an upper end thereof. In particular, it is preferred that the rib-shaped protrusions 12 extend in the same direction as the direction (F) (shown in Fig. 2A). Thereby, the effect of the shadow area (Ya) looking like the wall portion 7 is increased, therefore, the three-dimensional effect can be increased.
    [0034] It is preferred that at least one, each in this embodiment, of the rib-shaped protrusions 12 has a maximum width (D2) of 50 µm or more and 1000 µm or less, a protruding height (H2) of 50 µm or more and 1000 µm or less, and a distance (L2) of 100 µm or more and 1000 µm or less between centers of the rib-shaped protrusions 12, 12 adjacent to each other. since the rib-shaped protrusions 12 having such a size are less likely to reflect light, the absorption rate of light is increased, therefore, it is possible that the shadow area (Ya) is made to look darker.
    [0035] It should be noted that, as shown in Fig. 5, the rib-shaped protrusions 12 may have a trapezoidal cross-sectional shape formed in such a manner that a top portion of a triangle is removed.
    [0036] In Figures 6A and 6B, the minute protrusions 10 according to another embodiment are shown. In this embodiment, the minute protrusions 10 are formed as columnar protrusions 13. Also in the case of these columnar protrusions 13, the absorption area of light is increased, therefore, it is possible that the shadow area (Ya) is made to look darker than the main area (Yb).
    [0037] As a result, contrast (light and dark) is given to the bottom surface 6 of the concave mark 4, therefore, it is possible that the shadow area (Ya) is made to look like the shadow made by the wall portion 7 when light is shed from the direction (F). Further, it is possible that this shadow is made to look like a part of the wall portion 7 of the concave mark 4. And by these optical illusions, it is possible that the concave mark 4 is made to look deeper than its actual depth, therefore, the three-dimensional effect is increased, thereby, the legibility can be increased.
    [0038] It is preferred that at least one, each in this embodiment, of the columnar protrusions 13 has a maximum diameter (D1) of 50 µm or more and 1000 µm or less, a protruding height (H1) of 50 µm or more and 1000 µm or less, and a distance (L1) of 100 µm or more and 1000 µm or less between centers of the columnar protrusions 13, 13 adjacent to each other. since the columnar protrusions 13 having such a size are less likely to reflect light, the absorption rate of light is increased, therefore, it is possible that the shadow area (Ya) is made to look darker.
    [0039] In Figure 6A, a case in which the columnar protrusions 13 are arranged in a grid pattern is shown. However, they may be arranged in a staggered pattern, or may be randomly arranged as long as the distance (L1) satisfies the above range.
    [0040] In this embodiment, as the columnar protrusions 13, columnar protrusions 13A having a truncated conical shape having a smaller diameter on an upper end side thereof is shown. However, the columnar protrusions 13 may be columnar protrusions 13B having a cylindrical shape having a constant diameter (shown in Fig. 8B) or a prismatic columnar shape.
    [0041] In Figs. 8A and 8B, the columnar protrusions 13 according to further other embodiments are shown. At least one, each in these embodiments, of the columnar protrusions 13 in these embodiments has a concave portion 15 at a top end thereof. since these concave portions 15 decrease reflection of the irradiated light, it is possible that the shadow area (Ya) is made to look even darker, therefore, the three-dimensional effect of the concave mark 4 can be further increased.
    [0042] It is preferred that at least one, each in this embodiment, of the concave portions 15 is formed concentrically with a corresponding one of the columnar protrusions 13. Further, in at least one, each in this embodiment, of the columnar protrusions 13, it is preferred that a cross-sectional shape of the concave portion 15 taken orthogonal to a height direction of the columnar protrusion 13 is similar to the cross-sectional shape of the columnar protrusion 13 in order to maintain the strength uniformly.
    [0043] In these embodiments, the cross-sectional shapes of the concave portions 15 and the columnar protrusions 13 are circular. Further, as shown in Fig. 8A, at least one, each in this embodiment, of the concave portions 15 in this embodiment have a so-called tapered shape in which the inner diameter gradually and smoothly decreases as the depth of the concave portions 15 increases. However, as shown in Fig. 8B, the concave portions 15 may have a straight hole shape with a constant inner diameter.
    [0044] It is preferred that at least one, each in this embodiment, of depths (H3) of the concave portions 15 is 15% or more of each of the protruding heights (H1) of the columnar protrusions 13 in order to decrease the light reflection. Further, the upper limit of at least one, each in this embodiment, of the depths (H3) is preferably 100% or less, more preferably 90% or less of the protruding height (H1) from the point of view of securing the rigidity of the columnar protrusion 13.
    [0045] while detailed description has been made of the tyre as especially preferred embodiments of the present invention, the present invention can be embodied in various forms without being limited to the illustrated embodiments. [Working Examples (Examples)]
    [0046] As shown in Fig. 1, tyres provided with the mark (a character string of "ALKE") formed by the concave marks 4 on the surfaces of the sidewall portions were made by way of test according to the specifications listed in Table 1, and then the legibility of the marks was compared.
    [0047] As shown in Figs. 2A and 2B, the shadow area is the area along the shadow wall portion that is in the shadow of the wall portion of the concave mark when light is shed to the concave mark from the direction (the diagonal direction (F1) from the upper left side).
    [0048] when the minute protrusions were the rib-shaped protrusions (having triangular cross sections), the maximum width (D2) was 100 µm, the protruding height (H2) was 200 µm, and the distance (L2) was 200 µm. Further, when the minute protrusions were the columnar protrusions having truncated conical shapes, the maximum diameter (D1) was 100 µm, the protruding height (H1) was 200 µm, and the distance (L1) was 200 µm. Furthermore, in Example 5, the depth of the concave portion provided at the top end of the columnar protrusion is 15% of the protruding height of the columnar protrusion.
    [0049] The legibility was evaluated by a visual inspection and indicated by an index based on Reference 1 being 100. A larger numerical value is better. Table 1 Ref. 1 Ex.1 Ex.2 Ex.3 Ex.4 Ex.5 < Concave mark > Present • Depth (H) [mm] 0.5 • Shadow area Absent Present • Area width WA of shadow area/ Depth (H) - 2.5 1.0 2.5 2.5 2.5 Minute protrusion - Present • Rib-shaped protrusion - Present -  Direction of Ridgeline *1 - Same orthogonal - • Columnar protrusion having Truncated conical shape - - - - Present  (Presence or Absence of Concave portion) - - - - (Absence) (Presence) Legibility 100 130 115 120 120 130 *1) "same" means that the ridgeline of the rib-shaped protrusion extends in the same direction as the direction (F), and "orthogonal" means that the ridgeline of the rib-shaped protrusion extends orthogonally to the direction (F).
    [0050] As shown in Table 1, it can be confirmed that the Examples showed excellent legibility of the mark. Description of Reference signs
    [0051] 1tyre2sidewall portion2ssurface4concave mark6bottom surface7wall portion8shadow wall portion10minute protrusion12rib-shaped protrusion13columnar protrusion15concave portionF1diagonal directionFdirectionYashadow areaYbmain area
    权利要求:
    Claims (12)
    [0001] A tyre comprising a concave mark provided on a surface of a sidewall portion and recessed from the surface, wherein
    a bottom surface of the concave mark is divided into a shadow area, which is an area along a shadow wall portion that is in the shadow of a wall portion of the concave mark when light is shed to the concave mark from a direction, and a main area other than the shadow area, and
    the shadow area has a plurality of minute protrusions.
    [0002] The tyre according to claim 1, whereinin the shadow area, an area width (WA) from the shadow wall portion is larger than a depth (H) of the concave mark.
    [0003] The tyre according to claim 1 or 2, whereinthe direction is a diagonal direction when the concave mark is viewed from its front with an outer side in a tyre radial direction as the upper side.
    [0004] The tyre according to claim 3, whereinthe direction is the diagonal direction from an obliquely upper side as it goes from the radially outer side to the radially inner side.
    [0005] The tyre according to any one of claims 1 to 4, whereinthe minute protrusions are rib-shaped protrusions, in which widths thereof are decreased toward top ends thereof, arranged in parallel with each other.
    [0006] The tyre according to claim 5, whereinthe rib-shaped protrusions have maximum widths of 50 µm or more and 1000 µm or less, protruding heights of 50 µm or more and 1000 µm or less, and distances of 100 µm or more and 1000 µm or less between centers of the rib-shaped protrusions adjacent to each other.
    [0007] The tyre according claim 5 or 6, whereinthe rib-shaped protrusions extend in the same direction as the direction.
    [0008] The tyre according to any one of claims 1 to 4, whereinthe minute protrusions are columnar protrusions.
    [0009] The tyre according to claim 8, whereinthe columnar protrusions have maximum diameters of 50 µm or more and 1000 µm or less, protruding heights of 50 µm or more and 1000 µm or less, and distances of 100 µm or more and 1000 µm or less between centers of the columnar protrusions adjacent to each other.
    [0010] The tyre according to claim 8 or 9, whereinthe columnar protrusions have truncated conical shapes having smaller diameters on a side of upper ends thereof.
    [0011] The tyre according to any one of claims 8 to 10, whereinthe columnar protrusions have concave portions at their top ends.
    [0012] The tyre according to claim 11, whereindepths of the concave portions are 15% or more of protruding heights of the columnar protrusions.
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    同族专利:
    公开号 | 公开日
    CN111516436A|2020-08-11|
    JP2020125045A|2020-08-20|
    US20200247192A1|2020-08-06|
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