JP5725279B2 - Pneumatic tire and its vulcanization mold - Google Patents

Description

  The present invention relates to a pneumatic tire in which a mark, a size display, and a decoration are provided on an outer surface of a sidewall and a mold for vulcanization thereof.

  In general, this type of pneumatic tire is provided with a plurality of characters representing the manufacturer name, product name, tire size, etc. on the outer surface of the sidewall, and each character is marked on the sidewall so that each character stands out on the sidewall. In this case, the surface of each character is formed so as to protrude toward the center in the width direction (see, for example, Patent Document 1). In recent years, for the purpose of improving the decorativeness of tires and the like, there has been an increasing demand for conspicuous characters representing the manufacturer name, product name, tire size, etc. provided on the tire sidewall. The tire configuration is based on this requirement.

JP 2006-224704 A

  By the way, in the said pneumatic tire, since the surface of the character is formed so as to protrude toward the center in the width direction, when the character becomes large and each line constituting the character becomes thick, the character from the sidewall of the character The protruding height dimension is increased. However, there is a restriction on the height of the character provided on the side wall, and the air resistance of the tire increases with the height of the character, so the character protrudes from the side wall. There is a limit to increasing the height dimension.

  The present invention has been made in view of the above-mentioned problems, and its object is to provide a pneumatic tire that can make a mark or a size display or a character or figure for decoration provided on the outer surface of a sidewall stand out. And providing a mold for vulcanization thereof.

In order to achieve the above object, the present invention provides a pneumatic tire in which a character or a figure for a mark, a size display, or a decoration is provided on an outer surface of a sidewall. A plurality of cylindrical convex portions protruding from the surface and having an upper surface formed in a circular or elliptical shape are arranged so that the plurality of convex portions are arranged in a plurality of rows in each character or figure, and each The parallel arrangement direction dimensions of the convex portions are changed gradually in the row, and the upper surface of each convex portion is formed to have a surface roughness different from the upper surface of the outer surface of the sidewall.

The present invention also relates to a vulcanization mold for molding a pneumatic tire in which a mark, a size display, or a character or figure for decoration is provided on the outer surface of the sidewall, the letter or the figure being a side. It is formed by a set of a plurality of cylindrical protrusions protruding from the outer surface of the wall and having an upper surface that is circular or elliptical , and the plurality of protrusions are arranged in a plurality of rows in each character or each figure. At the same time, the dimensions in the juxtaposition direction of the convex portions in each row are gradually changed, and the upper surface of each convex portion is formed with a surface roughness different from the upper surface of the outer surface of the sidewall.

  In this way, each character or figure on the sidewall is formed by a set of a plurality of protrusions protruding from the outer surface of the sidewall, and the plurality of protrusions are arranged in a plurality of rows in each character or figure. In each row, since the dimensions of the protrusions in the juxtaposed direction gradually change, even if the height dimensions from the sidewall outer surface of each protrusion are equal, A visual effect is produced in which the range in which the convex portions having large dimensions in the juxtaposed direction are arranged is visible on the near side of the range in which the convex portions having small dimensions in the juxtaposed direction are arranged. In this case, since the upper surface of each convex portion is formed with a surface roughness different from the upper surface of the outer surface of the sidewall, the reflection of light on the upper surface of each convex portion and the light on the outer surface of the sidewall and the upper surface of each ridge Therefore, each projection can be made more conspicuous.

Further, the present invention provides a pneumatic tire in which characters or figures for marking, size display, or decoration are provided on the outer surface of the sidewall, and each character or each figure protrudes from the outer surface of the sidewall and is an upper surface. Is formed by a set of a plurality of cylindrical convex portions that are circular or elliptical , and the plurality of convex portions are arranged in a plurality of rows in each character or figure, and the parallel arrangement in each row. The arrangement pitch of the convex portions in the installation direction is gradually changed, and the upper surface of each convex portion is formed to have a surface roughness different from the upper surface of the outer surface of the sidewall.

Further, the present invention is a vulcanization mold for molding a pneumatic tire in which characters or figures for marking, size display and decoration are provided on the outer surface of a sidewall, and each letter or each figure is , Formed from a plurality of columnar convex portions protruding from the outer surface of the sidewall and having an upper surface that is circular or elliptical , and the plurality of convex portions are arranged in a plurality of rows in each character or each figure. It is arranged so that the arrangement pitch of each convex part in each row direction is gradually changed in each row, and the upper surface of each convex part is formed with a surface roughness different from the upper surface of the outer surface of the sidewall Has been.

  In this way, each character or figure on the sidewall is formed by a set of a plurality of protrusions protruding from the outer surface of the sidewall, and the plurality of protrusions are arranged in a plurality of rows in each character or figure. Since the arrangement pitch of the convex portions in the juxtaposed direction in each row is configured to change gradually, even if the height dimension from the sidewall outer surface of each convex portion is made equal, This produces a visual effect in which the range where the arrangement pitch is small is visible on the back side or the front side than the range where the arrangement pitch is large. In this case, since the upper surface of each convex portion is formed with a surface roughness different from the upper surface of the outer surface of the sidewall, the reflection of light on the upper surface of each convex portion and the light on the outer surface of the sidewall and the upper surface of each ridge Therefore, each projection can be made more conspicuous.

Further, the present invention provides a pneumatic tire in which characters or figures for marking, size display, or decoration are provided on the outer surface of the sidewall, and each character or each figure protrudes from the outer surface of the sidewall and is an upper surface. Is formed by a set of a plurality of cylindrical convex portions that are circular or elliptical , and the plurality of convex portions are arranged in a plurality of rows in each character or each figure, and each convex in each row The dimension of the parallel arrangement direction of the portions is configured to gradually change, and the color of the upper surface of each convex portion is set to a color other than black.

  In this way, each character or figure on the sidewall is formed by a set of a plurality of protrusions protruding from the outer surface of the sidewall, and the plurality of protrusions are arranged in a plurality of rows in each character or figure. In each row, since the dimensions of the protrusions in the juxtaposed direction gradually change, even if the height dimensions from the sidewall outer surface of each protrusion are equal, A visual effect is produced in which the range in which the convex portions having large dimensions in the juxtaposed direction are arranged is visible on the near side of the range in which the convex portions having small dimensions in the juxtaposed direction are arranged. In this case, since the color of the upper surface of each convex part is a color other than black, each convex part can be made more conspicuous.

Further, the present invention provides a pneumatic tire in which characters or figures for marking, size display, or decoration are provided on the outer surface of the sidewall, and each character or each figure protrudes from the outer surface of the sidewall and is an upper surface. Is formed by a set of a plurality of cylindrical convex portions that are circular or elliptical , and the plurality of convex portions are arranged in a plurality of rows in each character or figure, and the parallel arrangement in each row. The arrangement pitch of the convex portions in the installation direction is gradually changed, and the color of the upper surface of each convex portion is set to a color other than black.

  In this way, each character or figure on the sidewall is formed by a set of a plurality of protrusions protruding from the outer surface of the sidewall, and the plurality of protrusions are arranged in a plurality of rows in each character or figure. Since the arrangement pitch of the convex portions in the juxtaposed direction in each row is configured to change gradually, even if the height dimension from the sidewall outer surface of each convex portion is made equal, This produces a visual effect in which the range where the arrangement pitch is small is visible on the back side or the front side than the range where the arrangement pitch is large. In this case, since the color of the upper surface of each convex part is a color other than black, each convex part can be made more conspicuous.

According to the pneumatic tire and the vulcanization mold of the present invention, even if the height dimension and the depth dimension from the sidewall outer surface of each convex part are made equal, the convex part having a large parallel direction dimension. resulting visual effect but looks to the front side than the range positioned range is small convexes arranged dimension is placed, or, looked at the back side of the large range of small range of arrangement pitch arrangement pitch This produces a visual effect that can be seen on the front side, so that a mark, a size display, or a character or figure for decoration provided on the outer surface of the sidewall can be made conspicuous.

The principal part front view of the pneumatic tire of the 1st premise technique of the present invention Front view of pneumatic tire Front view of letters XX sectional view in FIG. Front view of characters showing a first modification of the first prerequisite technology Front view of characters showing a second modification of the first prerequisite technology Front view of characters showing a third modification of the first prerequisite technology Front view of characters showing a fourth modification of the first prerequisite technology Front view of characters showing a fifth modification of the first prerequisite technology Front view of characters of second premise technology of the present invention Front view of characters showing a sixth modification of the first prerequisite technology Table showing evaluation results Character sectional drawing which shows the 7th modification of the 1st basic technology Sectional drawing of the character which shows the 8th modification of 1st basic technology Character sectional drawing showing the 9th modification of the 1st basic technology Character sectional drawing showing the 10th modification of the 1st basic technology Sectional drawing of the character which shows the 11th modification of 1st basic technology

  The pneumatic tire of the first prerequisite technology of the present invention will be described with reference to FIGS. This pneumatic tire is used by being mounted on, for example, a four-wheel automobile, a truck, a bus, and the like.

  As shown in FIG. 1, this pneumatic tire is provided with a decorative band 2 in a band shape over the entire circumference in a predetermined radial range AR on the outer surface 1 a of the sidewall 1. The decorative band 2 is provided with a plurality of ridges R extending in the tire radial direction, and the ridges R are arranged so as to be substantially parallel to adjacent ridges (in a state of being 1 ° or less from each other). Each ridge R has a width dimension of, for example, 0.3 to 1.0 mm, and a height dimension of 0.1 to 0.5 mm based on the outer surface 1a of the sidewall 1. The decorative band 2 is provided with a plurality of characters 10 and figures 20 for marking, size display, and decoration, and each of the characters 10 and each figure 20 protrudes from the outer surface 1 a of the sidewall 1. It is formed by a set of T (see FIGS. 1 and 3). The cavities of the vulcanizing mold for vulcanizing and molding the tire are provided with irregularities corresponding to the ridges R, the convex portions T of the respective characters 10 and the convex portions T of the respective figures 20. Each ridge R, each character 10 and each figure 20 are engraved on the outer surface 1 a of the wall 1.

  Each convex part T is arrange | positioned so that it may be located in a line with a tire circumferential direction in each character 10 or each figure 20, and it is comprised so that the dimension of each convex part T in the juxtaposition direction may change gradually in each row | line | column. . For example, the letter 10 in FIGS. 1 to 3 represents a letter “Y”, and each convex portion T is formed in a circular shape or an elliptical shape when viewed from the tire axial direction, and each convex portion T has a dimension L in the tire circumferential direction. A character skeleton line BL (virtual line, which does not actually exist. It is a line located substantially at the center of the character and can be said to be a character skeleton. The same applies hereinafter) constituting the character “Y”. It is configured to gradually become larger. Each convex part T can be formed, for example so that the height from the outer surface 1a of the side wall 1 may be about 0.1-1.0 mm, and it sets to the height dimension beyond it according to a tire size. It is also possible. In this base technology, each convex part T is formed so that the height from the outer surface 1a of the sidewall 1 is 1.0 mm.

  Moreover, each convex part T in each figure 20 is formed in circular shape or ellipse shape seeing from a tire axial direction, and each convex part T has the dimension L of the tire circumferential direction toward the inner side from the width direction outer side of the figure 20. FIG. It is configured to gradually increase (see FIG. 1). Each convex part T is formed, for example so that the height from the outer surface 1a of the sidewall 1 may be about 0.1 to 1.0 mm.

  Thus, according to the base technology, each character 10 or each graphic 20 is formed by a set of a plurality of convex portions T projecting from the outer surface 1a of the sidewall 1, and within each character 10 or each graphic 20 The plurality of convex portions T are arranged in a plurality of rows, and the dimension L of each convex portion T in the juxtaposition direction in each row gradually increases toward the character skeleton line BL that forms the letter “Y”. Since each figure 20 is configured to increase or gradually increases from the outer side in the width direction toward the inner side, the height of each convex portion T from the outer surface 1a of the sidewall 1 is increased. Even when the dimensions are equal to each other, a visual effect is produced in which the convex portion T having a large juxtaposed direction dimension L is seen in front of the convex portion T having a small juxtaposed direction dimension L. As a result, for example, a visual effect is produced in which the vicinity of the character skeleton line BL constituting each character 10 appears to be higher than other portions, and each character 10 looks three-dimensional. Therefore, the mark 10 provided on the outer surface 1 a of the sidewall 1, the size display, and the characters 10 for the decoration can be made conspicuous.

  In this base technology, the character 10 is formed by a set of a plurality of convex portions T, and the convex portions T are arranged in a plurality of rows, and the dimensions of the convex portions T in the juxtaposed direction in each row. L changes in four or more stages. For example, in the range AR below the letter “Y” in FIG. 3, the dimension L of the convex portion T at the left end in the juxtaposed direction is the smallest, and the dimension L of the second and third convex portions T from the left end is the next smallest. , The dimension L of the fourth and fifth convex portions T from the left end is the next smallest, and the convex portion T arranged at the position corresponding to the sixth character from the left end, that is, the character skeleton line BL constituting the letter “Y” is The dimension L is the largest. Further, on the right side of the character skeleton line BL constituting the character “Y”, the dimension L of each convex portion T is gradually reduced in the same manner as the left side of the character skeleton line BL. On the other hand, as shown in FIG. 5, when the dimension L of each convex part T in the juxtaposition direction in each row is changed by three or more stages, the same effect as the present prerequisite technology is effectively obtained. Even if it is changed in two stages, the same effects as the present prerequisite technology can be achieved.

  Further, for example, in FIG. 3 of the base technology, the maximum convexity in the row with respect to the dimension L of the smallest convex portion T in a certain row (the dimension L of the convex portion T at the left end in the parallel direction in the range AR in FIG. 3). The dimension L of the portion T (the dimension L of the convex portion T at the center in the side-by-side direction in the range AR in FIG. 3) is configured to be about 1.8 times. However, as shown in FIG. Even if the dimension L of the maximum convex portion T is 1.5 times or more than the dimension L of T, a visual effect can be obtained in which the character 10 appears three-dimensionally, and the same effect can be obtained even if it is 1.3 times or more. .

  Further, in the base technology, the dimension L of each convex portion T is gradually changed so that the dimension L of the convex portion T becomes the largest at the position corresponding to the character skeleton line BL constituting the character 10. However, as shown in FIG. 6, the dimension L of each convex portion T can be set so that the dimension L of each convex portion T gradually decreases toward the character skeleton line BL constituting the character 10. It is.

  In the base technology, the letter “Y”, which is the character 10, is configured by a set of a plurality of convex portions T, and each convex portion T is arranged in the tire 10 in the tire circumferential direction. However, as shown in FIG. 7, for example, the protrusions T are arranged in a radial pattern within the letter “O”, and the protrusions T are arranged in a parallel direction L toward the character skeleton line BL. It can also be formed to gradually increase.

  Further, in the base technology, the dimension L of each convex portion T is gradually changed so that the dimension L of the convex portion T becomes the largest at the position corresponding to the character skeleton line BL constituting the character 10. However, as shown in FIG. 8, it is possible to gradually increase the dimension L of each convex portion T from the left end of the character 10 toward the right end. This produces a visual effect that is visible on the near side, and each character 10 looks three-dimensional. Or it is also possible to form each convex part T so that it may become small after the dimension L of each convex part T becomes large gradually over several times toward the right end from the left end of the character 10, and even in this case A visual effect is produced in which each convex portion T having a large dimension L can be seen on the near side, and the character 10 looks three-dimensional. Alternatively, as shown in FIG. 9, the dimension L of each convex portion T can be gradually changed in the vertical direction of the character 10. In addition, as shown in FIG. 9, by forming each convex portion T so that the size L of each convex portion T gradually increases over a plurality of times and then decreases, the character 10 can be displayed more three-dimensionally. It becomes possible.

  A pneumatic tire according to the second prerequisite technology of the present invention will be described with reference to FIG. This pneumatic tire is used by being mounted on, for example, a four-wheel automobile, a truck, a bus, and the like.

  This pneumatic tire is formed by a set of a plurality of convex portions T in which each character 10 and each graphic 20 protrude from the outer surface 1a of the sidewall 1 in the first base technology. It arrange | positions so that it may be located in a line with a tire circumferential direction within each figure 20, and it is comprised so that the arrangement | positioning pitch P of each convex part T in the arrangement direction in each row may change gradually.

  For example, the character 10 in FIG. 10 represents the letter “Y”, each convex portion T is formed in a circular shape when viewed from the tire axial direction, and the arrangement pitch P of each convex portion T in the tire circumferential direction is the character skeleton line BL. It is comprised so that it may become narrow gradually toward. Each convex part T can be formed, for example so that the height from the outer surface 1a of the side wall 1 may be about 0.1-1.0 mm, and it sets to the height dimension beyond it according to a tire size. It is also possible. In this base technology, each convex part T is formed so that the height from the outer surface 1a of the sidewall 1 is 1.0 mm.

  Thus, according to the second base technology, each character 10 or each graphic 20 is formed by a set of a plurality of convex portions T projecting from the outer surface 1a of the sidewall 1, and each character 10 or each graphic 20 The plurality of convex portions T are arranged so as to be arranged in a plurality of rows, and the arrangement pitch P of the convex portions T in the juxtaposed direction is gradually changed in each row. Even when the height dimension from the outer surface 1a of the sidewall 1 is equal to each other, a visual effect that a portion with a small arrangement pitch P can be seen on the back side or a front side than a portion with a large arrangement pitch P can be obtained. Arise. As a result, for example, a visual effect is produced in which the vicinity of the character skeleton line BL constituting each character 10 appears to be higher than other portions, and each character 10 looks three-dimensional. Therefore, the mark 10 provided on the outer surface 1 a of the sidewall 1, the size display, and the characters 10 for the decoration can be made conspicuous.

  In the second prerequisite technology, the character 10 is formed by a set of a plurality of convex portions T, and each convex portion T is arranged in a plurality of rows, and each convex portion T in the juxtaposition direction is arranged in each row. The arrangement pitch P changes in four steps or more. For example, in the lower range AR of “Y” in FIG. 10, the leftmost arrangement pitch P in the juxtaposition direction is the largest, the second arrangement pitch P from the left end is the next largest, and the third arrangement from the left end The pitch P is the next largest, and the arrangement pitch at the fourth position from the left end, that is, the position closest to the character skeleton line BL constituting the character “Y” is the smallest. Further, on the right side of the character skeleton line BL constituting the character “Y”, the arrangement pitch P is gradually changed in the same manner as the left side of the character skeleton line BL. On the other hand, when the arrangement pitch P in the juxtaposed direction in each row is changed by three or more steps, the same effect as the second premise technique is effectively obtained, and the change is changed in two steps. Even in this case, the same effects as the second prerequisite technology can be achieved.

  Further, for example, in FIG. 10 of the second base technology, the maximum arrangement in the column with respect to the minimum arrangement pitch P in a certain column (the arrangement pitch P closest to the character skeleton line BL in the bottom column in FIG. 10). The pitch P (the leftmost arrangement pitch P in the juxtaposition direction in the bottom row in FIG. 10) is configured to be about 1.8 times, but the maximum arrangement with respect to the minimum arrangement pitch P Even if the pitch P is 1.5 times or more, a visual effect is obtained in which the character 10 looks three-dimensional. Even if the pitch P is 1.3 times or more, the same effect can be obtained.

  In the second base technology, the arrangement pitch P is the smallest at the position corresponding to the character skeleton line BL constituting the character 10, but the arrangement is performed at the position corresponding to the character skeleton line BL constituting the character 10. It is also possible to gradually change the arrangement pitch P of the convex portions T in the juxtaposition direction in each row so that the pitch P becomes the largest.

  Similarly to the first base technology, it is also possible to arrange the convex portions T so as to be arranged radially in a character such as “O”, and gradually arrange the pitch P from the left end to the right end of the character 10. It is also possible to configure so that the arrangement pitch P gradually increases over a plurality of times from the left end to the right end of the character 10 and then decreases. It is also possible to gradually change the arrangement pitch P in the vertical direction of 10.

  In the first prerequisite technology, the arrangement pitch P of the convex portions T can be gradually changed. For example, as shown in FIG. 11, each convex portion T is configured such that the dimension L in the tire circumferential direction gradually increases toward the character skeleton line BL that forms the letter “Y”. The arrangement pitch P in the tire circumferential direction of T may be configured to gradually increase toward the character skeleton line BL. In the second base technology, a visual effect is produced in which a portion with a small arrangement pitch P is visible on the back side or a front side with respect to a portion with a large arrangement pitch P. On the other hand, if the arrangement pitch P of the part away from the character skeleton line BL is reduced in the first prerequisite technology, a visual effect is produced in which the vicinity of the character skeleton line BL appears to be raised, and each character 10 or each graphic 20 is displayed. It is more advantageous in making it stand out.

  In order to confirm the effects of FIGS. 3, 10 and 11, samples of FIGS. 3, 10 and 11 were prepared, and tire characters disclosed in Japanese Patent Application Laid-Open No. 2006-224704 were used as comparative examples. Also, the samples of FIGS. 3, 10 and 11 and the characters of the comparative example were formed in the same size.

  FIG. 12 shows the samples of FIGS. 3, 10 and 11 and comparative examples, which are observed by 30 people outdoors on a day of cloudy day when the sunlight is about 2000 to 40,000 lux. It is determined whether or not it is visible, and the decorativeness of each character 10 is determined, and the determination result is digitized. In the determination of whether or not it looks three-dimensional, if the number of persons judged to be three-dimensional exceeds 70% of the total, the determination value is 105, and the number of persons determined to be three-dimensional exceeds 85% of the whole In this case, the determination value is set to 110, and if the number of persons judged to be stereoscopically viewed exceeds 95%, the determination value is set to 115, and the number of persons determined to be stereoscopically visible is determined to exceed 30%. When the value is 100 and the number of people judged to be stereoscopically viewed is 30% or less, the judgment value is 95. When the number of people judged to be stereoscopically visible is 0%, the judgment value is 90. .

  Further, in the determination of the decorativeness, when the number of persons judged to be extremely decorative compared to the case of FIG. 10 exceeds 50% of the total, the determination value is set to 105, and the decorativeness is determined to be extremely high. When the number of people who have exceeded 75% of the total, the judgment value is 110, and when the number of people who have judged that the decoration is very high exceeds 90%, the judgment value is 115 and the decoration is judged to be very high When the number of people who have exceeded 30%, the judgment value is 100, and when the number of people judged to be very decorative is 30% or less, the judgment value is 95, and the number of people judged to be extremely decorative In the case of 0%, the judgment value was set to 90.

  From the evaluation results, in all of Examples 1 to 3, the character 10 appeared three-dimensionally equivalent to or higher than the comparative example, and it was evaluated that the decorativeness of the character 10 was higher than that of the comparative example. Moreover, compared with Example 1 and 2, Example 3 evaluated that the character 10 looked more three-dimensional and the decoration property of the character 10 was also higher.

  In addition, in the said evaluation, although what was evaluated outdoors in the daytime of a cloudy day when the sunlight was about 2000 to 40,000 lux was shown, illumination of the outdoors in the daytime of a fine day, and indoor Even in a situation where light is applied, the same effect as the evaluation result can be obtained.

Incidentally, in each of the base technology, it is also possible to form at least part of the top surface of each convex section T so as to form an outer surface 1a and the angle of the side wall 1. For example, as shown in FIG. 13, the upper surface of each convex portion T can be formed by a plane inclined at an angle α (preferably 5 °) or more with respect to the outer surface 1a of the sidewall 1. As shown in FIG. 14, the upper surface of each convex portion can be formed by a plurality of planes that form an angle with each other, and the upper surface of each convex portion T can also be formed by a convex curved surface as shown in FIG. As shown in FIG. 16, it is also possible to form each convex portion T with a concave curved surface. 13 to 16 are modified examples of the sectional view taken along the line XX in FIG.

Thus, out of the case of forming at least part so as to form an outer surface 1a and the angle of the side wall 1, the reflection and the side wall 1 of the light definitive upward surface of each convex section T top of each convex section T become light reflection are different in the surface 1a, also, the upper surface of the ridge R provided on the decorative band 2 is often be the outer surface 1a substantially parallel to the side wall 1, the upper surface of each convex section T since also different reflection of light in the definitive light upper surface of the reflection and the ridge R of the can be less noticeable to the convex portion T.

In an embodiment of the present invention, in the base technology, it is possible to the upper surface different from the surface roughness of the outer surface 1a and each ridge R on surfaces of the side walls 1 of each convex section T. For example, a 10 point average roughness of the upper surface of each convex section T, and a 10-point average roughness of the top surface of the outer surface 1a and each ridge R of the side walls 1, can be different than 3 [mu] m. In this case, the reflection of light at the outer surface 1a and top surface of each ridge R of light reflection and the sidewall 1 which definitive upward surface of each convex section T will be different, be less noticeable to the convex portion T it can. In addition, although the said effect can be show | played by varying 10-point average roughness 3 micrometers or more as mentioned above, it is preferable to make 7 micrometers or more different so that an effect may be show | played more reliably.

  As another embodiment of the present invention, in the base technology, the color of the upper surface of each convex portion T can be a color other than black. For example, in the unvulcanized tire, the outermost surface at the position corresponding to each character 10 and each figure 20 is black unvulcanized rubber of about 1 mm, and white unvulcanized rubber of about several mm is arranged inside it. Then, after vulcanizing the unvulcanized rubber with a vulcanizing mold, the upper surface of each convex portion T of each character 10 and each graphic 20 is polished with a buff or the like to expose white rubber, It is possible to make the upper surface of the convex portion T white. In this case, each convex part T can be made more conspicuous.

  In addition, in each said base technology, although each convex part T which comprises each character 10 and each figure 20 showed what was formed in the circular shape or the ellipse shape seeing from the tire axial direction, it makes it square shape. It is also possible, and other shapes are possible as shown in FIG. Even in this case, as long as the extending direction dimension L and the arrangement pitch P of each convex portion T are configured as described above, the same effects as described above can be obtained.

  In each of the above prerequisite technologies, the decorative portion 2 is provided with a plurality of ridges R and the characters 10 and the figures 20 are provided. However, when the decorative portion 2 is not provided with the ridge R, Even when other patterns are provided, the same effects as described above can be obtained. It is also possible to provide the character 10 or the figure 20 in a portion other than the decorative portion 2 of the sidewall 1.

  DESCRIPTION OF SYMBOLS 1 ... Side wall, 1a ... Outer surface, 2 ... Decoration band, 10 ... Character, 20 ... Graphic, T ... Convex part, R ... Ridge.

Claims (9)

In pneumatic tires where the outer surface of the sidewall is provided with characters or figures for marking, size display and decoration,
Each character or each figure is formed by a set of a plurality of convex portions protruding from the outer surface of the sidewall and having a circular or elliptical upper surface ,
The plurality of convex portions are arranged so as to be arranged in a plurality of rows in each character or each figure, and configured so that the juxtaposition direction dimension of the convex portions gradually changes in each row,
A pneumatic tire characterized in that the upper surface of each convex portion is formed with a surface roughness different from the upper surface of the outer surface of the sidewall. In pneumatic tires where the outer surface of the sidewall is provided with characters or figures for marking, size display and decoration,
Each character or each figure is formed by a set of a plurality of convex portions protruding from the outer surface of the sidewall and having a circular or elliptical upper surface ,
The plurality of convex portions are arranged so as to be arranged in a plurality of rows in each character or each figure, and the arrangement pitch of the convex portions in the juxtaposition direction is gradually changed in each row,
A pneumatic tire characterized in that the upper surface of each convex portion is formed with a surface roughness different from the upper surface of the outer surface of the sidewall. In pneumatic tires where the outer surface of the sidewall is provided with characters or figures for marking, size display and decoration,
Each character or each figure is formed by a set of a plurality of convex portions protruding from the outer surface of the sidewall and having a circular or elliptical upper surface ,
The plurality of convex portions are arranged so as to be arranged in a plurality of rows in each character or each figure, and configured so that the juxtaposition direction dimension of the convex portions gradually changes in each row,
A pneumatic tire characterized in that the color of the upper surface of each convex portion is a color other than black. In pneumatic tires where the outer surface of the sidewall is provided with characters or figures for marking, size display and decoration,
Each character or each figure is formed by a set of a plurality of convex portions protruding from the outer surface of the sidewall and having a circular or elliptical upper surface ,
The plurality of convex portions are arranged so as to be arranged in a plurality of rows in each character or each figure, and the arrangement pitch of the convex portions in the juxtaposition direction is gradually changed in each row,
A pneumatic tire characterized in that the color of the upper surface of each convex portion is a color other than black. The pneumatic tire according to claim 1 or 3 , wherein the arrangement pitch of the convex portions in the juxtaposed direction in each row is gradually changed. 6. The pneumatic tire according to claim 1 , wherein the dimensions of the convex portions in the juxtaposed direction are changed in three stages or more in each row. . The pneumatic according to any one of claims 2, 4 and 5 , wherein the arrangement pitch of the convex portions in the juxtaposed direction is changed in three or more stages in each row. tire. A vulcanizing mold for molding a pneumatic tire provided with a mark or size indication or a character or figure for decoration on the outer surface of the sidewall,
The character or figure is formed by a set of a plurality of columnar protrusions protruding from the outer surface of the sidewall and the upper surface is circular or elliptical , and the plurality of protrusions are arranged in a plurality of rows within each character or figure. It is arranged so that it is arranged side by side, and the size of the juxtaposed direction of each protrusion is gradually changed within each row,
A vulcanization mold for a pneumatic tire, characterized in that the upper surface of each convex portion is formed with a surface roughness different from the upper surface of the outer surface of the sidewall. A vulcanizing mold for molding a pneumatic tire provided with a mark or size indication or a character or figure for decoration on the outer surface of the sidewall,
Each character or each figure is formed by a set of a plurality of cylindrical projections protruding from the outer surface of the sidewall and having an upper surface of a circle or an ellipse, and the plurality of projections in each character or each figure. It is arranged so that it is arranged in a plurality of rows, and the arrangement pitch of the convex portions in the juxtaposition direction in each row is configured to gradually change,
A vulcanization mold for a pneumatic tire, characterized in that the upper surface of each convex portion is formed with a surface roughness different from the upper surface of the outer surface of the sidewall.