Lens periphery processing apparatus, method for obtaining processing data, and lens periphery processing method

Abstract

An apparatus and a method for processing lens peripheries which allow lenses to be properly fitted in a frame, i.e., which processes lenses with high dimensional accuracy. For this purpose, the lens periphery processing apparatus and method are designed to comprise an input device for inputting the configuration of lens frame portions of the eyeglasses frame which is a result of three-dimensional measurement, a calculation device for deriving peripheral lengths of the lens frame portions from the three-dimensional lens frame portion configuration inputted by the input device, a tapered edge curve determining device for determining a curve . .value.!. defined by the locus of the tapered edge of each lens, and a computing device for computing the locus of the tapered edge of each lens which substantially coincides with the peripheral length of the associated lens frame portion which is obtained by the calculation device.

What is claimed is: 
     
       1. A lens periphery processing apparatus for processing peripheries of lenses so as to fit the lenses in an eyeglasses frame, comprising: input means for inputting the configuration of lens frame portions of said eyeglasses frame which is a result of three-dimensional measurement;   calculation means for deriving peripheral lengths of the lens frame portions from the three-dimensional lens frame portion configuration inputted by said input means;   tapered edge curve determining means for determining a curve . .value.!. defined by the locus of the tapered edge of each lens; and   computing means for computing the locus of the tapered edge of each lens which substantially coincides with the peripheral length of the associated lens frame portion which is obtained by said calculation means.   
     
     
       2. A lens periphery processing apparatus according to claim 1, which is connected, through an interface, to an eyeglasses frame configuration measurement device for three-dimensional measurement of the lens frame portions of the eyeglasses frame. 
     
     
       3. A lens periphery processing apparatus according to claim 1, wherein said tapered edge curve determining means remove warp elements of the frame from the three-dimensional lens frame portion information and process it into two-dimensional lens frame portion information in the radius vector direction, and said tapered edge curve determining means determine the tapered edge curve . .value.!. on the basis of lens edge information of each lens to be processed at a position corresponding to said two-dimensional lens frame portion information thus processed. 
     
     
       4. A lens periphery processing apparatus according to claim 3, wherein said computing means comprise means for deriving a difference between the peripheral length of the locus of the determined tapered edge curve and the peripheral length in said three-dimensional lens frame portion information, and obtaining a correction amount of the position of the tapered edge for correcting said peripheral length difference. 
     
     
       5. A method for obtaining processing data of a lens periphery processing apparatus for fitting lenses in an eyeglasses frame, comprising: a first step of three-dimensional measurement of the configuration of lens frame portions of said eyeglasses frame;   a second step of deriving peripheral lengths of the lens frame portions of said eyeglasses frame on the basis of the data obtained in said first step;   a third step of measuring the lens edge thickness and the lens curve of each lens to be fitted in the frame;   a fourth step of determining the curve . .value.!. defined by the locus of the tapered edge on the basis of the data measured in said third step; and   a fifth step of calculating control data of the lens periphery processing apparatus such that the peripheral length of the locus of the tapered edge determined in said fourth step substantially coincides with the peripheral length of the associated lens frame portion of said eyeglasses frame.   
     
     
       6. A lens periphery processing method for processing peripheries of lenses so as to fit the lenses in an eyeglasses frame, comprising: a first step of three-dimensional measurement of the configuration of lens frame portions of said eyeglasses frame;   a second step of deriving peripheral lengths of the lens frame portions of said eyeglasses frame on the basis of the data obtained in said first step;   a third step of measuring the lens edge thickness and the lens curve of each lens to be fitted in the frame;   a fourth step of determining the curve . .value.!. defined by the locus of the tapered edge on the basis of the data measured in said third step;   a fifth step of calculating control data of a lens periphery processing apparatus such that the peripheral length of the locus of the tapered edge determined in said fourth step substantially coincides with the peripheral length of the associated lens frame portion of said eyeglasses frame; and   a sixth step of controlling the lens periphery processing apparatus on the basis of the control data obtained in said fifth step.