Substrate having V-shaped grooves having multi-angled V-shaped grooves and manufacturing method therefor

A substrate having V-shaped grooves having multi-angled V-shaped grooves in which a slant face of the V-shaped grooves has two or more angles, characterized in that a cross section of said V-shaped grooves is formed so that an angle that a straight line forming a groove below a contact point of a fiber with the V-shaped grooves makes with a tangential line at the contact point is an acute angle smaller than 180 degrees.

A manufacturing method for a substrate having V-shaped grooves having multi-angled V-shaped grooves in which a slant face of the V-shaped grooves has two or more angles and the cross section of said V-shaped grooves is formed so that an angle that a straight line forming a groove above a contact point of a fiber with the V-shaped grooves makes with a tangential line at the contact point is an acute angle smaller than 180 degrees, characterized in that by grinding a glass substrate using a diamond grinding stone having several types of tip end angles, the substrate having V-shaped grooves having a slant face shape with two or more angles is manufactured.

A manufacturing method for a substrate having V-shaped grooves having multi-angled V-shaped grooves in which a slant face of the V-shaped grooves has two or more angles and the cross section of said V-shaped grooves is formed so that an angle that a straight line forming a groove below a contact point of a fiber with the V-shaped grooves makes with a tangential line at the contact point is an acute angle smaller than 180 degrees, characterized in that by grinding a glass substrate using a diamond grinding stone having several types of tip end angles, the substrate having V-shaped grooves having a slant face shape with two or more angles is manufactured.

A manufacturing method for a mold in which a mold is ground by using a diamond grinding stone, said mold having an inverse chevron shape corresponding to a substrate having V-shaped grooves having multi-angled V-shaped grooves in which a slant face of the V-shaped grooves has two or more angles and the cross section of said substrate having V-shaped groove is formed so that an angle that a straight line forming grooves above a contact point of a fiber with the V-shaped grooves makes with a tangential line at the contact point is an acute angle smaller than 180 degrees.

A manufacturing method for a mold in which a mold is ground by using a diamond grinding stone, said mold having an inverse chevron shape corresponding to a substrate having V-shaped grooves having multi-angled V-shaped grooves in which a slant face of the V-shaped grooves has two or more angles and the cross section of said substrate having V-shaped grooves is formed so that an angle that a straight line forming a groove below a contact point of a fiber with the V-shaped grooves makes with a tangential line at the contact point is an acute angle smaller than 180 degrees.