Golf club head

Abstract

A head includes: a face member including fiber reinforced resin layers; and a body member. The face member includes a quasi-isotropic layered portion, and one or more configurations selected from the following (x) to (z): (x) a configuration that includes a distinct fiber-orientation layer containing fibers oriented at a predetermined fiber orientation angle different from fiber orientation angles of the fiber reinforced resin layers in the quasi-isotropic layered portion; (y) a configuration that includes a fiber-amount increasing layer relatively increasing an amount of fibers at a predetermined fiber orientation angle selected from the fiber orientation angles of the fiber reinforced resin layers in the quasi-isotropic layered portion; and (z) a configuration that includes a high elastic layer having a relatively high fiber elastic modulus at a predetermined fiber orientation angle selected from the fiber orientation angles of the fiber reinforced resin layers in the quasi-isotropic layered portion.

What is claimed is: 
     
         1 . A golf club head comprising: a face member including a plurality of fiber reinforced resin layers; and a body member, wherein
 the face member includes a quasi-isotropic layered portion in which at least some of the fiber reinforced resin layers are superposed on one another such that relative angles of fiber orientations of the respective fiber reinforced resin layers form a quasi-isotropic pattern,   the face member further includes one or more configurations selected from a group consisting of following (x), (y), and (z):   (x) a configuration that includes a distinct fiber-orientation layer containing fibers oriented at a predetermined fiber orientation angle that is different from fiber orientation angles of the fiber reinforced resin layers included in the quasi-isotropic layered portion;   (y) a configuration that includes a fiber-amount increasing layer that relatively increases an amount of fibers at a predetermined fiber orientation angle selected from the fiber orientation angles of the fiber reinforced resin layers included in the quasi-isotropic layered portion; and   (z) a configuration that includes a high elastic layer that has a relatively high fiber elastic modulus at a predetermined fiber orientation angle selected from the fiber orientation angles of the fiber reinforced resin layers included in the quasi-isotropic layered portion.   
     
     
         2 . The golf club head according to  claim 1 , wherein
 all the fiber reinforced resin layers are overall layers that extend across an entirety of the face member.   
     
     
         3 . The golf club head according to  claim 1 , wherein
 the face member has a constant wall thickness.   
     
     
         4 . The golf club head according to  claim 1 , wherein
 a toe-heel direction is designated as 0°, and the fiber orientation angles are defined as angles measured clockwise from 0°, and   the predetermined fiber orientation angle is greater than or equal to 90° and less than 180°.   
     
     
         5 . The golf club head according  claim 1 , wherein
 the distinct fiber-orientation layer, the fiber-amount increasing layer, and the high elastic layer are collectively referred to as anisotropy-creating layers, and   the anisotropy-creating layers are not located at an outermost layer of the face member.   
     
     
         6 . The golf club head according to  claim 1 , wherein
 the face member further includes a resin layer that contains no fibers; and   the resin layer is an outermost layer of the face member.   
     
     
         7 . The golf club head according  claim 1 , wherein
 the distinct fiber-orientation layer, the fiber-amount increasing layer, and the high elastic layer are collectively referred to as anisotropy-creating layers, and   a ratio of the number of the anisotropy-creating layers to the total number of the fiber reinforced resin layers is greater than or equal to 10% and less than or equal to 40%.   
     
     
         8 . The golf club head according  claim 7 , wherein
 the total number of the fiber reinforced resin layers is greater than or equal to 20 and less than or equal to 80.   
     
     
         9 . The golf club head according  claim 1 , wherein
 the quasi-isotropic pattern refers to a pattern in which fiber extending directions are equally distributed with equal angular intervals calculated as 180/n, where n is an integer greater than or equal to 2.   
     
     
         10 . A golf club head comprising: a face member including a plurality of fiber reinforced resin layers; and a body member, wherein
 the face member includes a quasi-isotropic layered portion in which at least some of the fiber reinforced resin layers are superposed on one another such that relative angles of fiber orientations of the respective fiber reinforced resin layers form a quasi-isotropic pattern,   the face member further includes an anisotropy-creating layer that creates anisotropy by disrupting mechanical symmetry that is formed by fibers extending in directions with equal angular spacing, and   the anisotropy-creating layer is included in the quasi-isotropic layered portion, or formed in addition to the quasi-isotropic layered portion.   
     
     
         11 . The golf club head according  claim 10 , wherein
 the anisotropy-creating layer includes a distinct fiber-orientation layer containing fibers oriented at a predetermined fiber orientation angle that is different from fiber orientation angles of the fiber reinforced resin layers included in the quasi-isotropic layered portion.   
     
     
         12 . The golf club head according  claim 10 , wherein
 the anisotropy-creating layer includes a fiber-amount increasing layer that relatively increases an amount of fibers at a predetermined fiber orientation angle selected from fiber orientation angles of the fiber reinforced resin layers included in the quasi-isotropic layered portion.   
     
     
         13 . The golf club head according  claim 10 , wherein
 the anisotropy-creating layer includes a high elastic layer that has a relatively high fiber elastic modulus at a predetermined fiber orientation angle selected from fiber orientation angles of the fiber reinforced resin layers included in the quasi-isotropic layered portion.   
     
     
         14 . The golf club head according to  claim 10 , wherein
 all the fiber reinforced resin layers are overall layers that extend across an entirety of the face member.   
     
     
         15 . The golf club head according to  claim 10 , wherein
 the face member further includes a resin layer that contains no fibers; and   the resin layer is an outermost layer of the face member.   
     
     
         16 . The golf club head according  claim 10 , wherein
 the anisotropy-creating layer comprises one or more anisotropy-creating layers,   a ratio of the number of the anisotropy-creating layers to the total number of the fiber reinforced resin layers is greater than or equal to 10% and less than or equal to 40%.   
     
     
         17 . The golf club head according  claim 16 , wherein
 the total number of the fiber reinforced resin layers is greater than or equal to 20 and less than or equal to 80.   
     
     
         18 . The golf club head according  claim 10 , wherein
 the quasi-isotropic pattern refers to a pattern in which fiber extending directions are equally distributed with equal angular intervals calculated 25 as 180/n, where n is an integer greater than or equal to 2.