Lens periphery processing method for eyeglass lens, lens periphery processing machine and lens for eyeglass

An eyeglasses lens periphery processing apparatus comprising:

• lens frame shape measuring means having a contact element for contacting contact points on both sides of a V-shaped groove formed in an inner face of an eyeglasses lens frame;
• and
• grinding means for processing a lens for said eyeglasses frame forming a V-shaped portion on a periphery of said lens based on lens frame shape data from said lens frame shape measuring means;
• wherein said V-shaped portion of said eyeglasses lens when installed into said V-shaped groove of said eyeglasses lens frame provides contact at said contact points on said both sides of the groove, said contact points being substantially the deepest contact points of the groove.

An eyeglasses lens periphery processing apparatus, comprising:

• lens frame shape measuring means having a contact element for contacting contact points on both sides of a V-shaped groove formed in an inner face of an eyeglasses lens frame;
• and
• grinding means for processing a lens for said eyeglasses frame forming a V-shaped portion on a periphery of said lens based on lens frame shape data from said lens frame shape measuring means;
• wherein said V-shaped portion of said eyeglasses lens when installed into said V-shaped groove of said eyeglasses lens frame provides contact at said contact points on said both sides of the groove, said contact points being substantially the deepest contact points of the groove, and
• wherein the contact element comprises a pair of gradually inclined faces forming a first opening angle from a tip end vertex, a pair of inclined face contact portions, and a pair of sharply inclined faces forming a second opening angle.

An eyeglasses lens periphery processing apparatus, comprising:

• lens frame shape measuring means having a contact element for contacting contact points on both sides of a V-shaped groove formed in an inner face of an eyeglasses lens frame;
• and
• grinding means for processing a lens for said eyeglasses frame forming a V-shaped portion on a periphery of said lens based on lens frame shape data from said lens frame shape measuring means;
• wherein said V-shaped portion of said eyeglasses lens when installed into said V-shaped groove of said eyeglasses lens frame provides contact at said contact points on said both sides of the groove, said contact points being substantially the deepest contact points of the groove, and
• wherein the contact element has a rectangular tip end.

An eyeglasses lens periphery processing apparatus, comprising:

• lens frame shape measuring means having a contact element for contacting contact points on both sides of a V-shaped groove formed in an inner face of an eyeglasses lens frame;
• and
• grinding means for processing a lens for said eyeglasses frame forming a V-shaped portion on a periphery of said lens based on lens frame shape data from said lens frame shape measuring means;
• wherein said V-shaped portion of said eyeglasses lens when installed into said V-shaped groove of said eyeglasses lens frame provides contact at said contact points on said both sides of the groove, said contact points being substantially the deepest contact points of the groove, and
• wherein the contact element has a rounded tip end.