JP2016083008A - Golf ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf ball which can improve an aesthetic appearance by making a joint line appearing in a part where two hemispherical bodies are joined to each other less noticeable.SOLUTION: A golf ball 100 is configured by arranging a transparent resin cover layer 120 on the outside of a joined transparent resin spherical body 110. The joined spherical body 110 is configured by joining two hemispherical bodies 111 to each other. Each of the two hemispherical bodies 111 is formed into a hemispherical shape with a recessed inner surface part 114. In the inner surface part 114, an annular reflective surface 116 is formed in parallel with a joined part J of the two hemispherical bodies 111. The annular reflective surface 116 comprises a plurality of first curved surface parts 116a comprising a curved surface projecting inward and a second curved surface part 116b formed between the first curved surface parts 116a. A plurality of the annular reflective surfaces are formed in such a manner that inner diameters are gradually reduced from a side of a joining part 113 in the inner surface part 114 to a side of a deepest part 114a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a golf ball used for ground golf or park golf.

  Conventionally, various golf balls used for ground golf and park golf have been proposed. For example, in Patent Document 1 below, a pattern with a sense of depth and depth is formed by configuring each inner peripheral surface of two transparent hemispheres constituting a golf ball with a polyhedron combining a plurality of polygonal planes. A golf ball is disclosed.

Japanese Patent No. 4718907

  However, in the golf ball described in Patent Document 1, since two transparent hemispheres are joined to each other, the joining portion of the two hemispheres inevitably appears, and the golf ball is beautiful. There is a problem that damages.

  The present invention has been made to address the above-described problems, and its object is to provide a golf ball capable of improving the aesthetics by making the joining line appearing at a portion where two hemispheres joined to each other inconspicuous. It is in.

  In order to achieve the above object, a feature of the present invention is that it includes a joined sphere composed of a sphere in which two hemispheres having concave inner peripheral surfaces are joined to each other to form a hollow portion at the center. Each of the two hemispheres is made of a transparent or translucent resin material, and has a belt-like shape along a joint portion where the two hemispheres are joined to each other on the inner peripheral surface. The extending annular reflecting surface is formed.

  According to the feature of the present invention configured as described above, the golf ball has an annular shape extending in a band shape along the joint portion where the two hemispheres are joined to each inner peripheral surface of the two hemispheres constituting the golf ball. Since the reflection surface is formed, the joining portion of the two hemispheres becomes inconspicuous by the annular reflection surface, and the aesthetic appearance can be improved.

  Another feature of the present invention is that, in the golf ball, a plurality of annular reflecting surfaces are formed such that an inner diameter is gradually reduced from a joint portion in the two hemispheres toward the back side. .

  According to the feature of the present invention configured as described above, the golf ball is formed with a plurality of annular reflecting surfaces with the inner diameter gradually decreasing from the joining portion in the two hemispheres toward the back side. The joining portion of the two hemispheres becomes less conspicuous by the plurality of annular reflecting surfaces, and the aesthetic appearance can be improved.

  Another feature of the present invention is that the golf ball further includes a cover layer made of a transparent or translucent resin material on the outside of the bonded sphere.

  According to another feature of the present invention configured as described above, the golf ball has a cover layer formed of a transparent or translucent resin material on the outside of the bonded sphere, and thus has a resin material having characteristics different from those of the bonded sphere. For example, golf balls having different specifications can be formed by using resin materials having different weather resistance, wear resistance, elasticity, or specific gravity as the cover layer.

  Another feature of the present invention is that in the golf ball, the cover layer is formed by two molds that have a concave formed portion corresponding to the hemispherical shape of the cover layer and are matched to each other. The bonding sphere is arranged in the cover layer in a state where the previous bonding portion is located in the same plane as the boundary mark between the two molds formed on the outer surface of the cover layer.

  According to another feature of the present invention configured as described above, in the golf ball, the boundary mark between the two molds formed on the outer surface of the cover layer and the joint portion of the joint sphere are positioned in the same plane. Therefore, the boundary marks are less noticeable and the aesthetic appearance can be improved.

  According to another aspect of the present invention, in the golf ball, the annular reflecting surface includes a plurality of first curved surface portions formed in a curved shape projecting inwardly along the circumferential direction. There is.

  According to another feature of the present invention configured as described above, the golf ball has a plurality of first curved surface portions along the circumferential direction, each of which has a curved surface in which the annular reflecting surface projects in a convex shape toward the inside of the hemisphere. Therefore, the light incident on the first curved surface portion from the outside can be dispersed and reflected according to the incident angle, and the glitter feeling when using the golf ball can be increased. Thereby, the golf ball can make the joining line of the boundary part of two hemispheres in a joining sphere inconspicuous, and can improve the visibility and aesthetics of the golf ball at the time of use. In particular, when ground golf or park golf is performed on a ground surface (including a bunker), the visibility of the golf ball decreases due to dust adhering to the outer surface of the golf ball or dust rising around the golf ball. At the same time, when the player is an elderly person, the visibility of the golf ball is further lowered, so that the effect of increasing the glitter of the golf ball is significant.

  Another feature of the present invention is that in the golf ball, the annular reflecting surface has a second curved surface portion formed of a curved surface projecting outwardly between the first curved surface portions adjacent to each other. There is in being.

  According to another aspect of the present invention configured as described above, the golf ball has a second curved surface portion formed of a curved surface projecting outwardly between the first curved surface portions adjacent to each other. Therefore, the light incident between the two first curved surface portions from the outside can be dispersed and reflected according to the incident angle to the second curved surface portion, and the glittering feeling when using the golf ball Can be further increased to improve visibility and aesthetics.

  Another feature of the present invention is that, in the golf ball, the two hemispheres each have an innermost surface formed of a curved surface.

  According to another feature of the present invention configured as described above, the golf ball is configured so that the innermost surface of each inner peripheral surface of the two hemispheres constituting the bonded sphere is formed of a curved surface, so that each hemisphere from the outside. The light incident on the innermost part of the body can be dispersed and reflected according to the incident angle, and the brightness and aesthetics of the golf ball can be further increased when used.

  Another feature of the present invention is that in the golf ball, the annular reflecting surface is contained in one virtual sphere having all the annular reflecting surfaces in the joined sphere concentric with the joined sphere and smaller than the joined sphere. It is to be formed in contact.

  According to another feature of the present invention configured as described above, the golf ball is inscribed in one virtual sphere in which all the annular reflecting surfaces in the bonded sphere are concentric with the bonded sphere and smaller than the bonded sphere. Therefore, the thickness between the outer surface and the cavity in the bonded sphere can be made substantially uniform, and the behavior can be stabilized by suppressing the non-uniform behavior of the golf ball with respect to the hit location.

  Another feature of the present invention is that, in the golf ball, the surface of the annular reflecting surface is formed in a number of irregular shapes.

  According to another feature of the present invention configured as described above, the golf ball is formed in a number of irregular shapes on the surface of the annular reflecting surface, and therefore diffusely reflects (diffusely reflects) light incident on the joined sphere. As a result, the joining portion of the two hemispheres can be made less noticeable, and fine flaws formed on the outer surface of the golf ball can be made less noticeable and use can be improved. The uneven shape formed on the surface of the annular reflecting surface is a shape in which a large number of fine protrusions are formed on the surface of the annular reflecting surface, and the shape of each protrusion is granular (for example, spherical, weight-like, stone-like), It can be composed of a linear shape (for example, a hairline) or a wrinkled shape (for example, a wrinkled shape).

1 is a perspective view illustrating an outline of an external configuration of a golf ball according to an embodiment of the present invention. FIG. 2 is a front view illustrating a schematic configuration of the golf ball illustrated in FIG. 1. FIG. 3 is a front sectional view showing an outline of the configuration of the golf ball shown in FIG. 2. FIG. 2 is a front cross-sectional view illustrating an outline of a configuration of a hemisphere that constitutes a bonded sphere in the golf ball illustrated in FIG. 1. It is a top view which shows the outline of a structure of the hemisphere shown in FIG. FIG. 5 is a cross-sectional view schematically showing a configuration and a molding process of a hemispherical mold for molding the hemisphere shown in FIG. 4. FIG. 2 is a cross-sectional view schematically showing a configuration of a cover layer molding die for molding a cover layer on the outer side of a bonded sphere in the golf ball shown in FIG. 1. It is sectional drawing which shows typically the formation process by the cover layer shaping die shown in FIG. It is a perspective view which shows the outline of the external appearance structure of the golf ball which concerns on the modification of this invention. It is front sectional drawing which shows the outline of a structure of the golf ball shown in FIG. FIG. 10 is a plan view schematically showing a configuration of a hemisphere that constitutes a bonded sphere in the golf ball shown in FIG. 9. (A)-(c) is a partial cross section of the uneven | corrugated | grooved part formed in the cyclic | annular reflective surface of the golf ball based on the modification of this invention, (a) has shown the uneven | corrugated | grooved part which protrudes in a hemisphere. (B) has shown the uneven | corrugated | grooved part which protrudes in weight shape, (c) has shown the uneven | corrugated | grooved part formed in groove shape.

  Hereinafter, an embodiment of a golf ball according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an outline of an external configuration of a golf ball 100 according to the present invention. FIG. 2 is a front view schematically showing the configuration of the golf ball 100 shown in FIG. FIG. 3 is a front sectional view showing an outline of the configuration of the golf ball 100 shown in FIG. 1 and 2, the internal structure of the golf ball 100 is indicated by a broken line. The golf ball 100 is a game ball having a diameter of 60 mm that is hit by a club in ground golf or park golf.

(Configuration of golf ball 100)
The golf ball 100 is mainly composed of a bonded sphere 110 and a cover layer 120. The bonded sphere 110 is a transparent or translucent part that forms the interior of the golf ball 100, and is formed by bonding two hemispheres 111 having the same shape to each other. Each hemisphere 111 is a component that constitutes one half of each of the bonded spheres 110, and mainly includes an outer surface portion 112, a bonded portion 113, and an inner surface portion 114.

  The outer surface portion 112 is a portion constituting the outer surface of the bonded sphere 110 and is formed in a hemispherical shape. The joint portion 113 is a portion that joins the two hemispheres 111 to each other, and has a flat surface portion that extends in a circular ring shape. A melted portion 113 a that is melted when the two hemispheres 111 are joined to each other is formed in a convex shape along the joined portion 113 at the central portion on the joined portion 113. The inner surface portion 114 is a portion that reflects light incident from the outside of the golf ball 100 while forming the hollow portion 115 inside the golf ball 100, and is formed in a concave shape from the joint portion 113 side. A plurality of annular reflecting surfaces 116 are formed on the inner surface portion 114 from the joining portion 113 side toward the back side.

  As shown in FIG. 4, the annular reflecting surface 116 is a portion that reflects light incident from the outside of the golf ball 100, and passes through the center line L of the hemisphere 111 (through the center of the bonding sphere 110 and the bonding portion 113). A belt-like surface is formed in an annular shape centering on an orthogonal straight line. In this case, as shown in FIG. 5, the annular reflecting surface 116 is configured by combining a plurality of first curved surface portions 116 a and a plurality of second curved surface portions 116 b with each other.

  The 1st curved surface part 116a is comprised by the curved surface which protrudes in the convex shape to the centerline L side. The second curved surface portion 116b is a curved surface connecting the two first curved surface portions 116a adjacent to each other, and has a larger curvature than the first curved surface portion 116a and a curved surface that protrudes outwardly from the bonded sphere 110. Has been. That is, the first curved surface portion 116a and the second curved surface portion 116b are alternately formed. In the present embodiment, the first curved surface portion 116a and the second curved surface portion 116b are each equally arranged in the circumferential direction by eight. In addition, the first curved surface portion 116a and the second curved surface portion 116b are formed as smooth and smooth curved surfaces in the present embodiment. In FIGS. 1 to 4, a boundary portion between the first curved surface portion 116 a and the second curved surface portion 116 b is indicated by a broken line or a solid thin line.

  The annular reflecting surface 116 has a plurality of annular reflecting surfaces 116 that gradually decrease in inner diameter in the inner surface portion 114 from the joint 113 side to the back side in a stepwise manner with the center line L as the center (that is, in a similar shape). Is formed. In the present embodiment, five annular reflecting surfaces 116 are formed in the inner surface portion 114 of one hemisphere 111. In this case, each annular reflecting surface 116 is formed such that all the annular reflecting surfaces 116 in the hemisphere 111 are concentric with the joining sphere 110 and inscribed in one virtual sphere C smaller than the joining sphere 110. The Further, the innermost portion 114 a of the inner surface portion 114 is configured by a curved surface that protrudes outward from the bonded sphere 110. In the present embodiment, the innermost portion 114 a of the inner surface portion 114 is configured by a spherical surface that protrudes outward from the bonded sphere 110.

  The hemisphere 111 is formed of a transparent or translucent resin material, for example, an ionomer resin material or an olefin resin material. The bonded sphere 110 is formed by integrating two hemispheres 111 formed in the same shape with each other by heat welding.

  The cover layer 120 is a portion that covers the entire surface of the bonded sphere 110, and is made of a transparent or translucent resin material. In this case, the cover layer 120 is made of a resin material that satisfies the specifications of the golf ball 100. Therefore, the cover layer 120 may be made of the same resin material as the bonded sphere 110 and may be made of a resin material different from the bonded sphere 110. The cover layer 120 is formed on the outer surface of the bonded sphere 110 with a thickness that allows the golf ball 100 to have an outer diameter defined by ground golf or park golf.

(Manufacture of golf ball 100)
Next, a method for manufacturing the golf ball 100 configured as described above will be described. First, the operator prepares a hemispherical mold 200 for molding the bonded sphere 110. As shown in FIG. 6, the hemispherical mold 200 includes a first mold 210 and a second mold 220 that form a pair and mold each side of the hemisphere 111. The first mold 210 is a mold for forming the joint portion 113 and the inner surface portion 114, which are one side of the hemisphere 111, and is a first molding having a shape obtained by inverting the shapes of the joint portion 113 and the inner surface portion 114. A portion 211 is formed. In the present embodiment, the first mold 210 has two first molding portions 211 formed via runner portions 212 in order to simultaneously mold the two hemispheres 111. The first mold 210 is formed with a sprue part 213 for guiding the resin material to the two first molding parts 211 via the runner part 212.

  On the other hand, the second mold 220 is a mold for molding the outer surface portion 112 which is the other surface of the hemisphere 111, and a second molding portion 221 having a shape obtained by inverting the shape of the outer surface portion 112 is formed. In the present embodiment, the second mold 220 is formed with two second molding portions 221 via runner portions 222 in order to simultaneously mold the two hemispheres 111. In addition, the number of the 1st shaping | molding part 211 and the 2nd shaping | molding part 221 which are formed in the 1st metal mold | die 210 and the 2nd metal mold | die 220 is determined suitably, and may be respectively formed one each. Three or more of each may be formed.

  Next, the operator performs injection molding of the hemisphere 111 by attaching the hemisphere molding die 200 to a known injection molding machine (not shown) and operating the injection molding machine. Here, the injection molding machine mainly injects the molten resin material into the mold clamping unit (not shown) for opening and closing the first mold 210 and the second mold 220 and the sprue portion 213 in the first mold 210. A unit 230 is provided. Therefore, the injection molding machine molds the hemisphere 111 by injecting the molten resin material from the injection unit 230 into the hemisphere molding mold 200 in which the first mold 210 and the second mold 220 are closed. .

  Next, the operator takes out the formed hemispherical body 111 from the hemispherical molding die 200 and then joins the two hemispherical bodies 111 to form the bonded spherical body 110. Specifically, the operator removes unnecessary portions respectively corresponding to the runner portions 212 and 222 and the sprue portion 213 from the formed hemisphere 111, and then a known hot air type or ultrasonic type welding device (not shown). The two hemispheres 111 are joined to each other by welding. In this case, the operator attaches the two hemispheres to each other by bonding the joints 113 of the two hemispheres 111 to each other in a state where the melted portions 113a formed at the joints 113 of the two hemispheres 111 are melted. 111 is joined. Further, in this case, the operator attaches the first curved surface portions 116a and the second curved surface portions 116b of the two hemispheres 111 so as to face each other. The curved surface portions 116b can also be deviated and bonded together.

  Next, the operator forms the cover layer 120 on the outer surface portion 112 of the bonded sphere 110. Specifically, the operator prepares a cover layer molding die 300 for molding the cover layer 120. As shown in FIG. 7, the cover layer molding die 300 includes a first mold 310 and a second mold 320 that form a pair and mold each side of the cover layer 120.

  The first mold 310 is a mold that molds half of the outer surface of the cover layer 120, and a first molded portion 311 having a shape obtained by inverting each shape of the half spherical surface is formed. In the present embodiment, the first mold 310 is formed with one first molding part 311. In this case, the first mold 310 is formed with a sprue portion 312 for guiding the molten resin material to the first molding portion 311. The first mold 310 is provided with support pins 313. The support pin 313 functions as an eject pin when the golf ball 100 is detached from the first mold 310 while supporting the bonded sphere 110 in a state of floating in the cover layer molding mold 300.

  On the other hand, the second mold 320 is a mold that molds the remaining half of the outer surface of the cover layer 120, and a first molded portion 321 having a shape obtained by inverting each shape of the spherical surface of the remaining half is formed. Yes. In the present embodiment, one second molding part 321 is formed in the second mold 320. In this case, the second mold 320 is formed with a sprue portion 322 for guiding the molten resin material to the first molding portion 321. The second mold 320 is provided with support pins 323. Similarly to the support pin 313, the support pin 323 supports the bonded sphere 110 in a floating state in the cover layer molding die 300 and ejects the golf ball 100 from the second die 320. Function as. In addition, the number of the 1st shaping | molding parts 311 and the 2nd shaping | molding parts 321 which are formed in the 1st metal mold | die 310 and the 2nd metal mold | die 320 is determined suitably, and may be formed 2 or more respectively. .

  An operator performs the injection molding of the cover layer 120 by attaching the cover layer molding die 300 to a known injection molding machine (not shown) and operating the injection molding machine. Here, in the same manner as described above, the injection molding machine mainly uses a mold clamping unit (not shown) for opening and closing the first mold 310 and the second mold 320, and a resin melted in the sprue portion 312 of the first mold 310. An injection unit 330 for injecting material is provided.

  The operator operates the injection molding machine to cause the support pins 313 and 323 to protrude in the first mold 310 and the second mold 320, respectively. The first mold 310 and the second mold 320 are supported in a floating state. In this case, the operator positions the joint portion J of the two hemispheres 111 constituting the joint sphere 110 and the mating portion T where the first mold 310 and the second mold 320 are in close contact with each other. The bonding sphere 110 is arranged in the cover layer molding die 300 in the direction. Then, as shown in FIG. 8, the operator melts the injection mold 330 from the injection unit 330 into the cover layer molding mold 300 in which the first mold 310 and the second mold 320 are closed by operating the injection molding machine. A resin material is injected.

  In this case, the injection molding machine injects the molten resin material into the cover layer molding die 300 and then retracts the support pins 313 and 323 from the first die 310 and the second die 320 at a predetermined timing, respectively. By doing so, the spherical cover layer 120 can be formed outside the bonded sphere 110. Accordingly, after the operator forms the cover layer 120, the operator operates the injection molding machine to open the first mold 310 and the second mold 320, thereby forming the cover layer 120 from the cover layer molding mold 300. The joined joint sphere 110 can be taken out.

  In this case, a boundary mark PL between the first mold 310 and the second mold 320 is formed on the outer surface of the cover layer 120 formed outside the bonding sphere 110 at a corresponding position on the outer side in the radial direction of the bonding portion J. Appears in streaks. Then, the operator performs golf after predetermined post-processes such as a removal process, a polishing process, a decoration process, and a cleaning process of unnecessary portions corresponding to the sprue portions 312 and 322 with respect to the bonded sphere 110 on which the cover layer 120 is formed. The ball 100 can be completed. 7 and 8, only the reference numerals of the main parts of the golf ball 100 are attached, and the internal structure of the bonded sphere 110 is indicated by a broken line. 7 and 8, the size of the sprue portion 312 is exaggerated.

(Operation of Golf Ball 100)
Next, the operation of the golf ball 100 configured as described above will be described. A user of the golf ball 100 prepares the golf ball 100 together with a club in a competition of ground golf or park golf. The user can play the game by placing the golf ball 100 on the playground and then hitting it with a club.

  In such ground golf and park golf competitions, the golf ball 100 has a plurality of annular reflection surfaces 116 extending along the center line L extending in a strip shape parallel to the joint portion J of the two hemispheres 111. Therefore, the joining portion J can be made inconspicuous regardless of the orientation of the golf ball 100 by the ridgeline forming the annular reflecting surface 116, the transmitted light and the reflected light from the first curved surface portion 116a and the second curved surface portion 116b. Further, in the golf ball 100, the boundary mark PL is formed on the same plane as the joint portion J of the two hemispheres 111, and therefore the boundary mark PL can be made inconspicuous by the joint portion J and the annular reflecting surface 116. .

  In addition, the golf ball 100 transmits part of the light incident on the golf ball 100 and reflects the other part by the annular reflecting surface 116 in various directions according to the incident angle. Visibility is improved when dust or scratches adhere to the outer surface of the golf ball, when dust is standing around the golf ball 100, when the golf ball 100 is separated from the user, and when the golf ball 100 is densely packed. be able to.

  Further, the golf ball 100 is formed so that all of the annular reflecting surfaces 116 in the bonded sphere 110 are concentric with the bonded sphere 110 and inscribed in one virtual sphere C smaller than the bonded sphere 110. The thickness between the outer surface of the sphere 110 and the cavity 115 can be made substantially uniform, and the behavior can be stabilized by suppressing the non-uniform behavior of the golf ball 100 with respect to the hit location.

  As can be understood from the above description of the operation, according to the above embodiment, the golf ball 100 is bonded to the two inner surfaces 114 of the two hemispheres 111 constituting the golf ball 100. Since a plurality of annular reflecting surfaces 116 extending in a strip shape along the portion J are formed with the inner diameter gradually decreasing from the joining portion J toward the back side, the joining portions J of the two hemispheres 111 are annularly reflected. The surface 116 becomes inconspicuous and the beauty can be improved.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention. In the following modifications, the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted.

  For example, in the above-described embodiment, five annular reflecting surfaces 116 are formed on the inner surface portions 114 of the two hemispheres 111 constituting the bonded sphere 110, respectively. However, the annular reflecting surface 116 formed in each inner surface portion 114 of each hemisphere 111 is not necessarily limited to the above embodiment, and if at least one or more are formed, it is difficult to make the joint portion J stand out. Can do. However, in this case, by forming a plurality of annular reflecting surfaces 116 from the joining portion 113 side to the innermost portion 114a side in the inner surface portion 114 of the hemisphere 111, the joining portion J can be made more inconspicuous effectively. it can. Further, the annular reflecting surface 116 can be formed in a different number between the two hemispheres 111 constituting the bonded sphere 110.

  Moreover, in the said embodiment, the cyclic | annular reflective surface 116 was comprised by two curved surfaces, ie, the 1st curved surface part 116a and the 2nd curved surface part 116b. However, the annular reflecting surface 116 only needs to be formed by extending a band-like reflecting surface in an annular shape along the joint portion. Therefore, the annular reflecting surface 116 can be configured by only the first curved surface portion 116a or only the second curved surface portion 116b, and has a single curvature over the entire circumference (in other words, a single curvature over the entire circumference). May be formed in a cylindrical shape. For example, when the annular reflecting surface 116 is configured only by the first curved surface portion 116a, the first curved surface portions 116a adjacent to each other are directly connected to each other. Further, when the annular reflecting surface 116 is constituted by a plurality of first curved surface portions 116a and / or a plurality of second curved surface portions 116b, the curvatures are different between the plurality of first curved surface portions 116a and the second curved surface portions 116b, respectively. It can also be made.

  Further, the annular reflecting surface 116 can be configured as a flat surface. For example, as shown in FIGS. 9 to 11, the annular reflecting surface 116 has an octagonal shape in plan view by arranging eight flat portions 116 c each having a flat surface adjacent to each other. A plurality of the annular reflecting surfaces 116 are formed in a stepwise decreasing manner from the joining portion 113 side to the innermost portion 114a side in the inner surface portion 114 of the hemisphere 111 (that is, in a similar shape). Yes. In the golf ball 100 having the annular reflecting surface 116 formed of the flat portion 116c, a part of the light incident on the golf ball 100 is transmitted and the other portion is directed in accordance with the incident angle by the flat portion 116c. Therefore, it is possible to make the joint portion J inconspicuous.

  The annular reflecting surface 116 can also be configured by appropriately combining the first curved surface portion 116a, the second curved surface portion 116b, and the flat surface portion 116c. Moreover, the annular reflective surface 116 can also comprise each annular reflective surface 116 formed in multiple numbers toward the innermost part 114a side from the junction part 113 side in one hemisphere 111 in a mutually different shape. For example, the annular reflecting surface 116 includes the annular reflecting surface 116 adjacent to the joint portion 113 as a flat surface portion 116c, and the annular reflecting surface on the innermost portion 114a adjacent to the annular reflecting surface 116 configured by the flat surface portion 116c. 116 can be composed of a first curved surface portion 116a and a second curved surface portion 116b. In FIG. 9, the internal structure of the golf ball 100 is indicated by a broken line.

  Further, in the above embodiment, each annular reflecting surface 116 is formed in one virtual sphere C in which all the annular reflecting surfaces 116 in the hemisphere 111 are concentric with the joining sphere 110 and smaller than the joining sphere 110. It formed so that it might touch. However, each annular reflecting surface 116 is not necessarily formed so as to be inscribed in one virtual sphere C, and can be freely formed in the bonded sphere 110.

  In the embodiment, the golf ball 100 has the cover layer 120 formed on the outer surface of the bonded sphere 110. However, the golf ball 100 can also be configured with only the bonded sphere 110. In this case, the outer diameter of the bonded sphere 110 is formed to an outer diameter that is recognized as a game ball for ground golf or park golf.

  In the above embodiment, the golf ball 100 is configured such that the boundary mark PL is formed on the same plane as the joint portion J of the two hemispheres 111. However, in the golf ball 100, the boundary mark PL does not necessarily have to be formed on the same plane as the joint portion J of the two hemispheres 111. When the boundary mark PL is slight, the boundary mark PL becomes a joint portion J. It can also be formed to cross each other.

  Moreover, in the said embodiment, each innermost part 114a of the two hemispheres 111 which comprise the joining sphere 110 was formed in spherical shape. However, the innermost part 114a of the hemisphere 111 is not necessarily formed in a spherical shape, and can be formed in a shape other than the spherical shape, for example, a curved surface shape or a planar shape, and a combination thereof. You can also.

  Moreover, in the said embodiment, each annular reflective surface 116 formed the surface smoothly. However, each annular reflecting surface 116 may be formed by forming a large number of irregular shapes on the surface. Specifically, each annular reflecting surface 116 is formed with a large number of concavo-convex portions 117 protruding or recessed from the surface, and the surface is formed into an embossed or grained concavo-convex surface (uneven or rough concavo-convex surface). Can do. In this case, the concavo-convex portion 117 is formed, for example, in a hemispherical shape as shown in FIG. 12A, or in a pyramid shape (for example, a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, or a six For example, a pyramid or the like, or may be formed in a concave shape in a linear groove as shown in FIG. According to this, the golf ball 100 makes the joint portion J of the two hemispheres 111 less noticeable by irregularly reflecting (diffuse reflection) the light incident on the joint sphere 110, and the golf ball 100 covers the golf ball 100 by use. Fine scratches formed on the outer surface of the layer 120 are less noticeable and can improve aesthetics.

L: Golf ball and hemispherical center line, C: virtual sphere, J: joined portion, T: mating portion, PL ... boundary mark,
100 ... golf ball,
DESCRIPTION OF SYMBOLS 110 ... Joint sphere, 111 ... Hemisphere, 112 ... Outer surface part, 113 ... Joint part, 113a ... Melting part, 114 ... Inner surface part, 114a ... Backmost part, 115 ... Hollow part, 116 ... Annular reflective surface, 116a ... First 1 curved surface portion, 116b ... second curved surface portion, 116c ... flat surface portion, 117 ... uneven portion,
120 ... cover layer,
200 ... hemispherical mold, 210 ... first mold, 211 ... first molding section, 212 ... runner section, 213 ... sprue section, 220 ... second mold, 221 ... second molding section, 222 ... runner section 230 ... Injection unit,
DESCRIPTION OF SYMBOLS 300 ... Cover layer shaping | molding die, 310 ... 1st metal mold | die, 311 ... 1st shaping | molding part, 312 ... Sprue part, 313 ... Support pin, 320 ... 2nd metal mold | die, 321 ... 2nd shaping | molding part, 322 ... Sprue part 323 ... support pins, 330 ... injection unit.

Claims (9)

A golf ball comprising a joined sphere composed of a sphere formed by joining two hemispheres having concave inner peripheral surfaces to each other to form a hollow portion at the center,
The two hemispheres are
Each is made of a transparent or translucent resin material, and an annular reflecting surface extending in a band shape is formed on each inner peripheral surface along a joining portion where the two hemispheres are joined to each other. Golf ball. The golf ball according to claim 1,
The annular reflecting surface is
A golf ball comprising a plurality of golf balls, wherein the inner diameters of the two hemispheres are gradually decreased from the joint portion toward the back side. The golf ball according to claim 1 or 2, further comprising:
A golf ball comprising a cover layer made of a transparent or translucent resin material on the outside of the bonded sphere. In the golf ball according to claim 3,
The cover layer is
It is formed by two molds that have a concave shaped part corresponding to the hemispherical shape of the cover layer and can be matched to each other,
The bonded sphere is
A golf ball, wherein the golf ball is disposed in the cover layer in a state where the joining portion is located in the same plane as a boundary mark between the two molds formed on the outer surface of the cover layer. In the golf ball according to any one of claims 1 to 4,
The annular reflecting surface is
A golf ball comprising a plurality of first curved surface portions formed of curved surfaces projecting inwardly in a circumferential direction along a circumferential direction. The golf ball according to claim 5,
The annular reflecting surface is
A golf ball comprising a second curved surface portion formed of a curved surface projecting outwardly between the first curved surface portions adjacent to each other. In the golf ball according to any one of claims 1 to 6,
The two hemispheres are
A golf ball characterized in that the innermost surface of each inner peripheral surface is a curved surface. In the golf ball according to any one of claims 1 to 7,
The annular reflecting surface is
A golf ball characterized in that all of the annular reflecting surfaces in the bonded sphere are formed in contact with one virtual sphere that is concentric with the bonded sphere and smaller than the bonded sphere. In the golf ball according to any one of claims 1 to 8,
The annular reflecting surface is
A golf ball characterized in that its surface is formed in a number of irregular shapes.

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