JP4888466B2 - Manufacturing method of inner surface progressive multifocal lens - Google Patents

Description

The present invention relates to an inner surface progressive multifocal lens manufacturing method and an inner surface progressive multifocal lens .

In recent years, spectacles using an inner progressive multifocal lens, which is bifocal spectacles, have been used when the eye's accommodation ability has decreased due to presbyopia or the like. This inner surface progressive multifocal lens is a lens in which a single lens has a different power. For example, the upper part of the lens is a distance part for viewing the distance, and the lower part is a near part for viewing the vicinity. From the distance and distance portions to the near portion, the refractive power progressively changes, and the distance portion, the near portion, and the progressive portion are formed on the inner surface (progressive surface) located on the eyeball side. The curvature is added (for example, refer patent document 1).
As a method of generating design data for such an inner surface progressive multifocal lens, for example, a three-dimensional function representing a three-dimensional surface, for example, a higher-order polynomial is used. Part), progressive power area (progressive part), near power area (near part), and the like, and a necessary progressive surface is created by parameters (see Patent Document 1).

JP 2002-122825 A (pages 2 to 5)

  Since the progressive progressive surface lens has different progressive surface shapes depending on lens prescription data (for example, spherical power, astigmatism power, astigmatism axis, aberration, addition power, etc.) Need to design. In the design method as described above, the prescription data is acquired, the refractive power distribution and the curvature are calculated based on the prescription data, and the function is calculated. Therefore, there is a problem that it takes time to generate the design data. is there.

An object of the present invention is to provide a manufacturing method of an inner surface progressive multifocal lens and an inner surface progressive multifocal lens capable of quickly generating design data of the inner surface progressive multifocal lens .

The design data generation system of the present invention includes a distance portion and a near portion having different refractive powers, and a progressive portion in which the refractive power gradually changes between them, and an inner surface located on the eyeball side. A method for manufacturing an inner surface progressive multifocal lens in which curvatures constituting the distance portion, near portion, and progressive portion are added to a progressive surface, and prescription data including optical characteristics of the inner surface progressive multifocal lens is acquired. A prescription data acquisition step, and a reference design data storage step for storing a plurality of reference design data corresponding to the addition of the inner surface progressive multifocal lens , wherein the reference design data is a grid of reference progressive surfaces compartment and its is intended to have a point group consisting of the coordinates of the grid points, characterized in that the semi-finished lens to shape creating in accordance with the prescription data based on the reference design data.

Here, the reference design data stored in the reference design data storage step is designed based on reference design parameters such as addition, progressive zone length, and progressive zone width.
Further, the design data generated by the manufacturing method of the present invention may be constituted by point clouds, design data obtained by surface interpolation of design data constituted by point clouds, It may be design data obtained by converting the interpolated design data into an NC machining program. When obtaining surface interpolation design data or NC machining program design data, the design data generation system should have a function for surface interpolation of point clouds and a function for machining surface interpolation data into NC machining programs. Good.
According to the present invention, a plurality of reference design data corresponding to the addition power is stored in the reference design data storage step , and the reference design data is selected and processed based on the prescription data. Therefore, compared to the case where design data is created from the beginning as in the prior art, the time required for generating design data can be shortened. Therefore, design data can be generated quickly.
Further, when the progressive surface is obtained by a three-dimensional function, for example, a high-order polynomial, the degree of freedom in design is limited by the used function, and a smooth progressive surface may not be configured. On the other hand, in the present invention, the reference progressive surface is partitioned into a lattice shape, and the coordinates of the point group are processed in the arrangement design process based on the point group composed of the coordinates of the lattice point. Then, a curved surface equation may be formed for each lattice plane partitioned by the lattice in the arranged point group, and surface interpolation may be performed. When performing surface interpolation, the curved surface is continuous at the boundary of each lattice surface. Find the equation. Thus, in the present invention, since the design data based on the point group is generated, a smooth progressive surface can be configured.

Further, in the present invention, a measurement result of the optical characteristics of the processed inner surface progressive multifocal lens is obtained, a comparison determination step for comparing and determining the prescription data or the inspection data based on the prescription data and the measurement result, and the comparison determination In the process , when it is determined that the deviation amount between the prescription data or the inspection data based on the prescription data and the measurement result is a predetermined value or more, the design processed in the arrangement design process based on the deviation amount It is preferable to have a correction design process for correcting data.

According to the present invention, the correction design process for correcting the design data based on the deviation amount between the measurement result of the optical characteristics of the inner surface progressive multifocal lens and the prescription data or the inspection data based on the prescription data is provided. Therefore, more accurate design data can be generated.
In addition, when correcting the design data, it is conceivable that the correction value is directly reflected in the design parameter and the design data is directly generated from this design parameter. In this case, the design data reflecting the correction is used. It takes time and effort to generate. On the other hand, in the present invention, the design data processed in the arrangement design process is corrected, so that the corrected design data can be generated more quickly than when the data is generated again from the beginning.
Furthermore, since the design data designed in the arrangement design process is corrected, the correction can be made without depending on the type of program for generating the reference design data from the design parameters.

In this invention, it is preferable to have the test | inspection data generation process which produces | generates the data for a test | inspection used for the test | inspection of the said inner surface progressive multifocal lens based on the said design data.
According to the present invention, since the inspection data generation step for generating the inspection data is provided, when the inner surface progressive multifocal lens is actually manufactured, the inner surface progressive multifocal lens has the desired characteristics. It is possible to easily make a pass / fail judgment as to whether or not it has.
Also, if the measured value and the prescription data are misaligned due to the characteristics of the measuring device that inspects the progressive progressive multifocal lens, it is possible to generate more accurate data by generating inspection data that predicts the actual value. Inspection can be performed.

Furthermore, in the present invention, it is preferable to provide an eccentric design step of decentering the design center of the progressive surface after the arrangement design.
In particular, it is preferable to correct the prism amount after decentering the design center of the progressive surface by a predetermined distance.
If the design center of the progressive surface coincides with the geometric center of the inner surface progressive multifocal lens, depending on the distance between the pupils of the user and the shape of the frame, the inner surface progressive In some cases, the focus lens cannot be formed into a lens frame shape.
In such a case, since the present invention has an eccentric design step , the design center of the progressive surface can be decentered, and the target lens shape can be processed.
In addition, when the progressive surface is actually processed without the eccentric design, if the semi-finished lens is decentered and attached to the shape creation device, an inner surface progressive multifocal lens with a progressive surface can be manufactured. In this case, since the semi-finished lens is decentered and attached to the shape creation device, blurring occurs during shape creation, and processing accuracy may be reduced.
On the other hand, in the present invention, since the eccentric design is performed, it is not necessary to decenter the semi-finished lens and attach it to the shape creation device, and it is possible to prevent the processing accuracy from being lowered during shape creation.

Furthermore, in the present invention, it is preferable to have a new reference design data generation step for generating new reference design data and storing it in the reference design data storage step .
According to the present invention, since there is a new reference design data generation step , for example, reference design data having different progressive zone lengths, progressive zone widths, etc. are generated and added to the reference design data storage step . be able to. Thus, since the reference design data can be increased, variations of the inner surface progressive multifocal lens can be expanded.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a design data generation system according to the present invention. This design data generation system is for generating design data of the inner surface progressive multifocal lens L.
Here, as shown in FIG. 2, the inner surface progressive multifocal lens L includes a distance portion L1 and a near portion L2 having different refractive powers, and a progressive portion in which refractive power changes progressively between them. L3 is a lens in which curvatures constituting the distance portion L1, the near portion L2, and the progressive portion L3 are added to an inner surface (progressive surface) L4 located on the eyeball side. The outer surface L5 is a spherical surface.
As such an inner surface progressive multifocal lens L, a semi-finished lens (an incomplete lens having a substantially circular shape with a thickness larger than that of the inner surface progressive multifocal lens L as a finished product) corresponding to prescription data is selected. It is obtained by creating a shape of a semi-finished lens based on design data.

  The design data generation system includes a calculation server device 1, and includes a communication control unit 11 that controls input / output of data, a central processing unit 12 that includes a CPU that executes various programs, and data. And storage means 13 including a hard disk and a memory for storing.

The central processing unit 12 includes a prescription data acquisition unit 121, a reference design data selection unit 122, an arrangement design unit 123, and a correction design unit as a program developed on an OS (Operating System) that controls the operation of the CPU. 124, an eccentric design unit 125, an aim value calculation unit 126 as an inspection data generation unit, a comparison determination unit 127, a new reference design data generation unit 128, and an NC machining program generation unit 129.
The prescription data acquisition unit 121 acquires prescription data including optical characteristic information among data input from the communication control unit 11. This prescription data is stored in the prescription data storage means 131 of the storage means 13. Here, the prescription data refers to information including, for example, spherical power, astigmatism power, astigmatism axis, aberration, addition, interpupillary distance, and the like.
Note that the calculation server device 1 is connected to an order receiving server device (not shown), and the order receiving server device is assigned an order number to the prescription data and the like, and the prescription data and the like are subjected to communication control from the order receiving server device through a communication line such as a LAN. Input to the unit 11.

  The reference design data selection unit 122 selects reference design data from a plurality of reference design data stored in the reference design data storage unit 132 of the storage unit 13 based on the addition degree of the prescription data acquired by the prescription data acquisition unit 121. To choose. As shown in FIG. 3, the reference design data includes a point group composed of three-dimensional coordinate data of a lattice point P (X, Y, Z), which is a reference progressive surface L6 partitioned into a lattice shape.

The arrangement design unit 123 changes the design by processing the reference design data acquired by the reference design data selection unit 122 based on the prescription data.
For example, the arrangement design means 123 changes the curvature of the progressive surface (eyeball side surface) of the reference design data based on the spherical power, which is one of the prescription data. Based on this, the value of Z at an arbitrary lattice point (X, Y, Z) of the progressive surface of the inner surface progressive multifocal lens L is obtained.
That is, the value of Z is represented by the following formula (1).
The axis extending from the object side to the eyeball side and passing through the center of the progressive surface (eyeball side surface) is the Z axis, the axis perpendicular to the Z axis from the bottom to the top is the Y axis, and the Z axis is from the left to the right. X and Y of an arbitrary point (X, Y, Z) indicate the X coordinate of the surface on the eyeball side and the arbitrary coordinate of the Y coordinate, respectively, and Z is the eyeball. The Z coordinate of the side surface is shown.

Here, the progressive surface is only for the purpose of the original progressive refracting surface only for the purpose that the eyeball side surface exhibits the desired visual acuity correction characteristic, and for the purpose of the eyeball side surface for the desired astigmatism correction characteristic. It is obtained by synthesizing the original toric surface.
Cp represents an approximate curvature as an average curvature in the radial direction of the original progressive surface. Cx represents the curvature of the original toric surface in the X-axis direction, and Cy represents the curvature of the original toric surface in the Y-axis direction.
Cx is represented by the following formula (2).

Cb is the curvature (base curve) of the object side surface of the reference design data, that is, the outer surface side, and Csf is the curvature (base curve) of the outer surface side of the semi-finished lens. N is the refractive index of the semi-finished lens, and S is the spherical power of the prescription data.
Cy is represented by the following formula (3).

  Ct indicates a curve for astigmatism.

The design data designed in this way is stored in the design data storage unit 134 of the storage unit 13.
When it is known that the design data designed by the arrangement design unit 123 needs to be corrected in advance, the data designed by the arrangement design unit 123 may be corrected in advance by the correction design unit 124 described later. Good. For example, according to the state of the machine tool main body 32 (see FIG. 8) of the NC machine tool 3, the data designed by the arrangement design unit 123 may be corrected in advance by the correction design unit 124 described later.

The eccentric design means 125 is for decentering the design center of the progressive surface designed by the arrangement design means 123. The eccentric design unit 125 acquires the shape information of the spectacle frame from the data transmitted from the order receiving server device (not shown) and reads the prescription data stored in the prescription data storage unit 131 of the storage unit 13. Then, the eccentric design means 125 determines whether or not the eccentric design is necessary based on the distance between the pupils included in the prescription data and the shape of the spectacle frame.
For example, as shown in FIG. 4, when the design center O of the progressive surface L4 coincides with the geometric center G of the inner surface progressive multifocal lens L, the inner surface progressive multifocal lens L is processed and framed in a spectacle frame. In this case, depending on the distance between the pupils of the user and the shape of the frame, the inner surface progressive multifocal lens L may not be formed into a lens frame shape. That is, when processing is performed in accordance with the shape of the spectacle frame, the outer shape V1 of the spectacle lens (the two-dot chain line in FIG. 4) may protrude from the inner surface progressive multifocal lens L. In such a case, the design center O of the progressive surface L4 is decentered by a predetermined distance so that the outer shape V2 of the spectacle lens does not protrude from the inner surface progressive multifocal lens L as shown by the solid line in FIG. In FIG. 4, A1 indicates an aberration curve before decentering, and A2 indicates an aberration curve after decentering.
Here, as an eccentric design method, there are the following methods. For example, as shown in FIG. 5A, first, the design center O of the progressive surface L4 is horizontally moved by a predetermined distance to be eccentric. Next, as shown in FIG. 5B, in order to return the prism amount, the progressive surface L4 is rotated by a predetermined angle in the arrow direction.
In addition, as shown in FIG. 6, there is a method in which the center point R of the curve of the outer surface L5 is obtained and the progressive surface L4 and the outer surface L5 are rotated based on the center point R.

The aim value calculation means 126 is an inspection data generation means for generating inspection data for the inner surface progressive multifocal lens L. This target value calculation means 126 interpolates the design data (or the design data designed eccentrically by the eccentric design means 125) composed of the point cloud designed by the arrangement design means 123, and uses the ray tracing method. The measurement value of the lens progressive of the inner surface progressive multifocal lens L is predicted and calculated.
In the inner surface progressive multifocal lens L, since the progressive surface L4 is formed of an aspherical surface, when the user actually wears glasses, the line of sight and the progressive surface L4 are not orthogonal to each other. However, when measuring with a lens meter, the measurement is performed with the optical axis orthogonal to the progressive surface L4. Therefore, there is a difference between the prescription data value and the measured value. Therefore, the measured value of the inner surface progressive multifocal lens L at the lens meter is predicted and calculated in advance, and this target value is used as inspection data.
For example, when the prescription of the inner surface progressive multifocal lens L is the near portion L2, the spherical refractive power S is + 4D, the cylindrical refractive power C is -2D, and the astigmatic axis is 10 °, the target value is, for example, the spherical refractive power S Is + 4.1D, the cylindrical refractive power C is -1.7D, and the astigmatic axis is 10 °.
The target value calculated by the target value calculating unit 126 is stored in the target value storage unit 133 of the storage unit 13.

  The comparison discriminating unit 127 acquires the measured value (actual value) of the processed inner surface progressive multifocal lens L, and compares the target value calculated by the target value calculating unit 126 with the actual value. Then, a deviation amount between the actually measured value and the target value is calculated, and it is determined whether or not the deviation amount is a predetermined value or less. For example, the power of the distance portion L1 of the inner surface progressive multifocal lens L or the power of the distance portion L1 and the near portion L2 is confirmed and compared with the target value.

The correction design unit 124 corrects the design data when the comparison determination unit 127 determines that the amount of deviation between the target value and the actual measurement value exceeds a predetermined value.
For example, the correction amount (deviation amount) of the curvature in the X-axis direction in the distance portion L1 is Cdx, the correction amount of the curvature in the Y-axis direction is Cdy, and the correction amount (deviation amount) of the curvature in the X-axis direction in the near portion L2. Is Cnx, the correction amount of the curvature in the Y-axis direction is Cny, the center coordinates of the distance portion L1 are (Xd, Yd), and the center coordinates of the near portion L2 are (Xn, Yn).
In this case, the correction amounts Cpx and Cpy of the progressive portion L3 are as shown in Expression (4) and Expression (5).

Here, Y is the value of the Y coordinate where the correction amount is obtained.
By substituting these correction amounts (Cdx, Cdy, Cnx, Cny, Cpx, Cpy) into Cx and Cy in Equation (1), the correction amount of the Z coordinate is calculated.

The new reference design data generation unit 128 acquires reference design parameters for creating new reference design data, and generates new reference design data.
For example, a new progressive zone length, a progressive zone width, or the like as a reference design parameter is acquired, and new reference design data is generated based on the new progressive zone length. The reference design data acquired by the new reference design data generation means 128 is stored in the reference design data storage means 132.

  The NC machining program generation means 129 converts the design data designed by the arrangement design means 123 (or machined by the eccentric design means 125 or the correction design means 124) into an NC machining program which is numerical control command data. is there. For example, in design data composed of point cloud data, a surface equation of each lattice plane is obtained and surface interpolation is performed to generate an NC machining program. Examples of the surface interpolation method include curved surface interpolation using a Pezier curve, a quadratic spline function, or the like. In addition, when performing surface interpolation, a curved surface formula may be obtained so as to be continuous at the boundary of each lattice surface. For example, the curved surface expression of each lattice plane may be such that up to the second derivative continues at the boundary of each lattice plane.

The storage unit 13 includes a prescription data storage unit 131, a reference design data storage unit 132, a design data storage unit 134, and a target value storage unit 133.
The prescription data storage unit 131 stores the prescription data acquired by the prescription data acquisition unit 121 of the central processing unit 12. The prescription data is stored in association with the order number assigned by the order receiving server device.
The reference design data storage unit 132 stores a plurality of reference design data of the inner surface progressive multifocal lens L corresponding to a plurality of different addition powers. For example, reference design data corresponding to each addition increased by 0.25 D in the range of addition 0.50D to 3.50D is stored.
Such reference design data is configured based on design parameters such as addition, progressive zone length, change in progressive zone frequency, progressive zone width, and the like.

The design data storage unit 134 stores design data designed by the arrangement design unit 123, design data designed by the eccentric design unit 125, and design data corrected by the correction design unit 124. Such design data is stored in association with the order number assigned by the order receiving server device.
The aim value storage means 133 stores the aim value calculated by the aim value calculation means 126, and is stored in association with the order number assigned by the order receiving server device.

In the calculation server device 1 as described above, design data for the inner surface progressive multifocal lens L is generated as follows. This will be described with reference to FIG.
First, optometry, spectacle frame selection, etc. are performed at a spectacle lens retail store, etc., and the data is acquired by the order receiving server device, and an order number is assigned.
Of the information transmitted from the order receiving server device, prescription data is acquired by the prescription data acquisition means 121 of the calculation server device 1 and stored in the prescription data storage means 131 (prescription data acquisition procedure, process S1). Based on the addition included in the prescription data, the reference design data selection means 122 selects reference design data from the reference design data storage means 132 (reference design data selection procedure, process S2). Then, the selected reference design data is processed based on the prescription data by the arrangement design means 123 (arrangement design procedure, process S3).

Next, prescription data, spectacle lens frame shape information, and the like are acquired by the eccentric design means 125, and based on these, it is determined whether or not an eccentric design is necessary (eccentricity determination procedure, process S4). When it is determined that the eccentric design is necessary, the eccentric design means 125 performs the eccentric design (eccentric design procedure, process S5).
When the eccentric design means 125 performs the eccentric design, the design data after the eccentric design is stored in the design data storage means 134, and when the eccentric design means 125 does not perform the eccentric design, the arrangement design means The design data processed by 123 is stored in the design data storage means 134.

Further, the target value calculation means 126 reads the prescription data stored in the prescription data storage means 131, and calculates the target value (target value calculation procedure, process S6).
Further, the design data generated as described above is processed into an NC processing program by the NC processing program generation means 129 (NC processing program processing procedure, step S7).
The NC machining program and the target value obtained as described above are output to the data server device 2 as shown in FIG. 8 (output procedure, process S8).

The generated NC machining program is stored in the data server device 2 connected to the calculation server device 1.
Note that the NC machining program is composed of a series of instruction blocks, and includes route information, speed information, and the like. The route information is information indicating a command of a predetermined movement locus, and has a G code for designating operation preparation functions such as linear interpolation, circular interpolation, and temporary stop. The speed information has an F code that designates the feed speed.

Further, the data server device 2 is connected to the NC machine tool 3. The NC machine tool 3 includes a numerical control device 31 and a machine tool main body 32.
The machine tool main body 32 has, for example, an X-axis servo system, a Y-axis servo system, and a Z-axis servo system for moving the tool in the X-axis direction, the Y-axis direction, and the Z-axis direction, and rotates the spindle as necessary. A drive system such as a spindle driver is provided.
The numerical control device 31 analyzes the NC machining program read from the data server device 2, obtains the moving amount and moving speed of the tool (not shown) of the machine tool main body 32, and outputs it to the machine tool main body 32. Thereby, the tool of the machine tool main body 32 is driven and controlled, and the inner surface progressive multifocal lens L is processed.

Next, the processed inner surface progressive multifocal lens L is inspected. Specifically, the inner surface progressive multifocal lens L is measured with a lens meter, and actual measurement values (spherical power, astigmatism power, astigmatism axis, aberration, addition power, etc.) are obtained. Then, the actual measurement value is input to the inspection terminal. Although not shown, the inspection terminal is connected to the calculation server device 1 via a network, and the actual measurement value is acquired by the comparison / discriminating means 127 of the calculation server device 1 via the network (processing S9).
The comparison determination unit 127 compares the target value calculated by the target value calculation unit 126 with the actual measurement value. Then, a deviation amount between the actually measured value and the target value is calculated, and it is determined whether or not the deviation amount is equal to or less than a predetermined value (comparison determination procedure, process S10).

If the amount of deviation is less than or equal to the predetermined value, it is determined that the desired inner surface progressive multifocal lens L has been manufactured, and the manufacture of the inner surface progressive multifocal lens L is completed.
When the deviation amount exceeds a predetermined value, the design data stored in the design data storage unit 134 is read by the correction design unit 124 and the design data is corrected (correction design procedure, process S11). The corrected design data is stored in the design data storage unit 134.
The corrected design data is processed into an NC processing program by the NC processing program generation means 129 (processing S7) and output to the data server device 2 (processing S8), and the NC processing program in the data server device 2 is updated. . Based on the corrected NC machining program, the inner surface progressive addition lens L is reworked, inspected again, and discriminated by the comparison discriminating means 127 (processing S9). Then, the comparison / discriminating unit 127 repeats the processes S7 to S11 until the deviation amount between the target value calculated by the target value calculating unit 126 and the actual measurement value is equal to or less than a predetermined value.

Therefore, according to this embodiment, the following effects can be produced.
(1) The reference design data storage unit 132 of the storage unit 13 of the calculation server device 1 stores a plurality of reference design data corresponding to the addition degree. The calculation server device 1 uses the reference data based on the prescription data. Since the design data is selected and processed, the time required for generating the design data can be reduced as compared with the case where the design data is created from the beginning as in the prior art. Therefore, design data can be generated quickly.
(2) When a progressive surface is obtained by a three-dimensional function, for example, a high-order polynomial, the degree of freedom of design is limited by the used function, and a smooth progressive surface may not be configured. .
On the other hand, in the present embodiment, the reference progressive surface is partitioned into a lattice shape, and the arrangement design means 123 processes the coordinates of the point group based on the point group composed of the coordinates of the lattice points. Then, a curved surface equation is formed for each lattice plane partitioned by the lattice in the arranged point group, and surface interpolation is performed. When performing surface interpolation, a curved surface equation may be obtained so as to be continuous at the boundary of each lattice surface. Thus, in this embodiment, since the design is performed based on the point group, a smooth progressive surface can be configured.

  (3) The calculation server device 1 corrects the design data based on the amount of deviation between the measurement result of the optical characteristics of the inner surface progressive multifocal lens L and the target value which is the inspection data based on the prescription data. Therefore, more accurate design data can be generated. Thereby, the desired inner surface progressive multifocal lens L can be processed.

(4) When correcting the design data, it is conceivable to directly generate the design data from the design parameter by directly reflecting the deviation amount from the target value which is the inspection data based on the prescription data in the design parameter. However, in this case, it takes time to generate design data reflecting the correction. On the other hand, in this embodiment, the correction design unit 124 corrects the design data designed by the arrangement design unit 123 and the design data designed by the eccentric design unit 125, so that data is generated from the beginning. Compared with the case where it re-does, the design data corrected rapidly can be produced | generated.
Further, since the design data designed by the arrangement design unit 123 and the design data designed by the eccentric design unit 125 are corrected, the correction is performed without depending on the type of program for generating the reference design data from the design parameters. can do.

(5) Moreover, in this embodiment, since the calculation server apparatus 1 is provided with the target value calculation means 126 which calculates the target value as test | inspection data, it can calculate a target value and is thereby manufactured. Whether the inner surface progressive multifocal lens L thus formed has the desired optical characteristics can be easily and accurately determined.
That is, in the inner surface progressive multifocal lens L as in the present embodiment, the progressive surface L4 is formed of an aspherical surface. Therefore, when the user actually wears glasses, the line of sight and the progressive surface L4 are orthogonal to each other. do not do. On the other hand, when measuring with a lens meter, since the measurement is performed with the optical axis orthogonal to the progressive surface L4, there is a difference between the prescription data value and the measurement value. Therefore, it is possible to perform a more accurate inspection by predicting and calculating in advance the measurement value of the inner surface progressive multifocal lens L with the target meter by the target value calculation means 126.

(6) Furthermore, since the calculation server device 1 has the eccentric design means 125, the design center O of the progressive surface L4 can be eccentric. When the design center O of the progressive surface L4 coincides with the geometric center G of the inner surface progressive multifocal lens L, when the inner surface progressive multifocal lens L is processed and framed in the spectacle frame, the distance between the pupils of the user Depending on the distance and the shape of the frame, the inner surface progressive multifocal lens L may not be cast into the shape of a spectacle frame. In such a case, since the calculation server device 1 can perform an eccentric design, it is possible to perform target processing.
Further, the eccentric design means 125 determines whether or not the eccentric design is necessary based on the distance between the pupils included in the prescription data and the shape of the spectacle frame. Can be prevented.

(7) Further, if the calculation server device 1 is not provided with the eccentric design means 125 and the progressive surface is actually processed without the eccentric design, the semi-finished lens is eccentric and attached to the shape generating device. An inner surface progressive multifocal lens having a decentered surface can be manufactured.
However, in this case, since the semi-finished lens is decentered and attached to the shape creation device, blurring occurs during shape creation, and processing accuracy may be reduced. Therefore, it may not be possible to manufacture an inner surface progressive multifocal lens having a desired progressive surface.
On the other hand, in this embodiment, since the eccentric design means 125 performs the eccentric design, there is no need to decenter the semi-finished lens and attach it to the shape creation device, thereby preventing a reduction in processing accuracy during shape creation. can do. Thereby, the inner surface progressive multifocal lens L which has a desired progressive surface can be manufactured.

  (8) Furthermore, since the calculation server device 1 has the new reference design data generation means 128, new reference design data can be generated and stored in the reference design data storage means 132. Thus, since the reference design data can be increased, variations of the inner surface progressive multifocal lens can be expanded.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, although the calculation server device 1 has the new reference design data generation unit 128 in the embodiment, the new reference design data generation unit 128 may not be provided.
Moreover, in the said embodiment, although the calculation server apparatus 1 had the target value calculation means 126 which produces | generates a target value as test | inspection data, it is not restricted to this, For example, inner surface progressive multiple is used as data for a test | inspection. An aberration diagram of the focus lens L may be generated. In this way, the inspection can be performed by comparing the shape of the progressive surface of the manufactured inner surface progressive multifocal lens L with the aberration curve of the aberration diagram. Further, the calculation server device 1 may be configured not to include inspection data calculation means for calculating inspection data.

Furthermore, in the above embodiment, the calculation server device 1 includes the comparison / discriminating unit 127, acquires the measured value of the processed inner surface progressive multifocal lens L, and calculates the target value and the actually measured value calculated by the target value calculating unit 126. However, a comparison / determination means may be provided in the inspection terminal or the like. For example, the target value is transmitted from the calculation server device 1 to the inspection terminal, the actual measurement value is input to the inspection terminal, the comparison determination is performed at the inspection terminal, and the result of the comparison determination is transmitted to the calculation server device 1 May be.
Further, without providing the comparison / determination means, the operator may output the target value from the calculation server device 1 to the inspection terminal, and the operator may compare the actually measured value with the target value. In this case, however, the operator has to make a comparison and determination, which is troublesome. On the other hand, in the said embodiment, since the comparison discrimination | determination means 127 of the calculation server apparatus 1 is performing comparison discrimination | determination, an operator's burden can be eased.

Furthermore, in the said embodiment, although the calculation server apparatus 1 was provided with the eccentric design means 125, it is not restricted to this, The eccentric design means 125 does not need to be. By doing in this way, the burden concerning the calculation server apparatus 1 can be reduced.
Further, the calculation server device 1 generates design data composed of point clouds and stores the data in the data server device 2 after being converted into an NC machining program. The designed data may be stored in the data server device 2 and converted into an NC machining program by the data server device 2 or the NC machine tool 3 or the like. By doing in this way, the operation | work in the calculation server apparatus 1 can be simplified.

Further, in the embodiment, the design data is corrected by the correction design unit 124 when the deviation amount between the target value and the actual measurement value exceeds the predetermined value. However, the present invention is not limited to this, and for example, the design data is processed by the arrangement design unit 123. When the deviation (for example, the difference in Z value) at each point in the design data point group is large, the deviation may be corrected (ie, smoothed) by the correction design means 124. By generating design data in which the deviation is corrected in this way, a more optimal inner surface progressive multifocal lens can be manufactured.
Further, each means of the calculation server device 1 of the above embodiment reads the program to control the generation operation of the design data. However, the present invention is not limited to this, and is configured by, for example, hardware such as various logic elements. It is also good.
Furthermore, a program constituting each means of the calculation server device 1 may be provided on a recording medium such as a CD-ROM. If the recording medium is provided, design data can be generated inexpensively and easily.

  The present invention can be used to generate design data of an inner surface progressive multifocal lens.

1 is a block diagram showing a design data generation system according to an embodiment of the present invention. The schematic diagram which shows an inner surface progressive multifocal lens. The figure which shows the state which divided the progressive surface in the grid | lattice form. The schematic diagram which shows the outline | summary of eccentric design. The schematic diagram which shows the method of eccentric design. The schematic diagram which shows the other method of eccentric design. The flowchart which shows the production | generation method of design data. The schematic diagram which shows the relationship between a calculation server apparatus, a data server apparatus, NC machine tools, etc.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Calculation server apparatus, 122 ... Standard design data selection means, 123 ... Arrange design means, 124 ... Correction design means, 125 ... Eccentric design means, 126 ... Aim value calculation means (inspection data generation means), 128 ... New reference | standard Design data generation means, 132... Reference design data storage means.

Claims (5)

A distance portion and a near portion having different refractive powers, and a progressive portion in which the refractive power gradually changes between the distance portion and the near portion, and the distance portion, the near portion on the progressive surface that is an inner surface located on the eyeball side. A manufacturing method of an inner surface progressive multifocal lens to which a curvature constituting a working part and a progressive part is added,
A prescription data acquisition step of acquiring prescription data including optical characteristics of the inner surface progressive multifocal lens;
A reference design data storage step for storing a plurality of reference design data corresponding to the addition degree of the inner surface progressive multifocal lens;
A reference design data selection step for selecting reference design data based on prescription data acquired in the prescription data acquisition step from among a plurality of reference design data stored in the reference design data storage step,
Arrangement design process for processing the reference design data selected in the reference design data selection process based on the prescription data acquired in the prescription data acquisition process,
A comparison determination step of acquiring a measurement result of the optical characteristics of the inner surface progressive multifocal lens processed in the arrangement design step, and comparing and determining the prescription data or the inspection data based on the prescription data, and the measurement result;
In the comparison determination step, when it is determined that the amount of deviation between the prescription data acquired in the prescription data acquisition step or the test data based on the prescription data and the measurement result is a predetermined value or more, the deviation amount Based on the correction design process for correcting the design data processed in the arrangement design process,
Have
The reference design data divides a reference progressive surface into a lattice shape, and has a point group composed of coordinates of the lattice points.
A method for producing an inner surface progressive multifocal lens, wherein a shape of a semi-finished lens corresponding to the prescription data is created based on the reference design data. The manufacturing method according to claim 1 ,
A method for manufacturing an inner surface progressive multifocal lens, comprising: an inspection data generation step for generating inspection data used for the inspection of the inner surface progressive multifocal lens based on the design data. In the manufacturing method of Claim 1 or 2 ,
A method of manufacturing an inner surface progressive multifocal lens, comprising: an eccentric design step of decentering a design center of the progressive surface after processing reference design data in the arrangement design step. In the manufacturing method of Claim 3 ,
In the decentering design step, the design center of the progressive surface is decentered by a predetermined distance, and then the prism amount is corrected. In the manufacturing method in any one of Claim 1 to 4 ,
A method of manufacturing an inner surface progressive multifocal lens, comprising: a new reference design data generation step of generating new reference design data and storing the reference design data in the reference design data storage step.

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