JP2963822B2 - How to calculate the distance between eyeglass frames - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle frame shape measuring apparatus for measuring the shape of a spectacle frame in advance when the spectacle lens is ground or cut in accordance with the shape of the spectacle frame. More specifically, the present invention relates to a spectacle frame distance calculating method for accurately calculating a spectacle frame distance of spectacles located at an arbitrary spatial position in a spectacle frame shape measuring apparatus in a three-dimensional manner.

[0002]

2. Description of the Related Art A processing side of a spectacle lens calculates a desired lens shape including a bevel shape based on information on a spectacle lens and a spectacle frame sent from a spectacle lens ordering side. Information on whether or not lens processing is possible, and further, the expected finish shape of the spectacle lens including the beveled shape, is returned to the ordering side, and the ordering side sends the transmitted availability information or finish Display the expected shape on the screen and check whether lens processing including beveling is possible, or check the expected finish shape, and based on this confirmation, determine the eyeglass lens with the optimal bevel A system for supplying spectacle lenses, which is designed to place an order, has been proposed by the present applicant (Japanese Patent Application No. 4-165912).

[0003] The realization of this system is based on the premise that the shape of the spectacle frame is accurately grasped. Above all, it is necessary that the measurement value of the shape of the spectacle frame is accurately calculated three-dimensionally.

On the other hand, the distance between the left and right spectacle frames in the data representing the shape of the spectacle frames is extremely difficult when the data on the two spectacle frames is three-dimensionally accurately arranged and restored as spectacles. Important data.

Therefore, it is required that the distance between the spectacle frames is accurately calculated three-dimensionally from the measured value of the shape of the spectacle frame. Conventionally, methods for obtaining the distance between eyeglass frames from the measured shape of the eyeglass frame include, for example, Japanese Patent Application Laid-Open Nos. 62-16909 and 3-2618.
As disclosed in Japanese Patent Application Publication No. 14, when measuring the shapes of the left and right eyeglass frames, the distance between the eyeglass frames is determined by measuring the amount of movement of the measuring means moved from one frame to the other frame. As disclosed in JP-A-4-18516,
There has been a method in which the spectacle frame is measured while holding the spectacle frame at a predetermined position, and the geometric center distance of each spectacle frame is determined from the measured value.

[0006]

However, the above-mentioned Japanese Patent Application Laid-Open
62-16909, JP-A-3-261814,
The distance between eyeglass frames and each eye disclosed in Kaihei 4-18516
The method of finding the geometric center distance of the mirror frame is a two-dimensional frame.
Data is used. That is, the front direction of the glasses
Is the Z-axis direction of the spectacle frame shape device (measurement in FIG.
(Up and down direction of child)
And subsequent calculations are performed on that assumption.
Was.

Accordingly, Japanese Patent Application No. Hei 4-165912 discloses this.
Frame data (order 3)
Processor) recognizes the frame shape based on the
Take out the predetermined frame information to be processed
When implementing a system to deploy to
How to process 3D frame data
Was an issue.

The present invention has been made in order to solve such a problem.
Is measured by a three-dimensional measuring device.
Frame data with higher accuracy from the
The purpose is to obtain information on the

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an eyeglass frame shape measuring device having a three-dimensional measuring mechanism.
For the spectacle frame held at any spatial position in the device,
Eyeglasses measured by the three-dimensional eyeglass frame shape measuring device
From the three-dimensional measurement data of the frame, the data is
Obtain the eyeglass frame pupil distance of the eyeglass frame while performing the conversion
Eyeglass frame distance calculation method, comprising a three-dimensional eyeglass frame shape
3D measurement data of spectacle frame measured by measuring device
Calculating the front directions of the left and right eyeglass frames,
Based on each forward direction of the spectacle frame of the left and right the calculated, calculating a forward direction of the spectacles, in the front direction perpendicular to the plane of the glasses from the front direction of the calculated spectacle glasses datum line Step of calculating direction
When the respective front direction of the spectacle frame of the left and right the calculated, the <br/> the front direction of the calculated spectacle, based on the datum line direction of the calculated spectacle, between the eyeglass frame of the right-left frame distance
The measurement reference point is detected, and the position of the eyeglass frame distance measurement reference point is detected.
A spectacle frame distance calculating method is provided, wherein the spectacle frame distance is calculated based on the placement information .

[0010]

First, the front directions of the left and right spectacle frames are calculated based on the three-dimensional shape measurement data of the left and right spectacle frames and the three-dimensional distance data between the measurement origins of the right and left spectacle frames. The front direction of the glasses is calculated based on each front direction of the left and right eyeglass frames.

Next, the datum line direction of the glasses on a plane perpendicular to the calculated front direction of the glasses is calculated.
Then, based on these calculated directions, the left and right frames are
The eyeglass frame distance measurement reference point is detected, and this eyeglass frame distance meter is used.
The distance between the eyeglass frames is calculated from the position information of the measurement reference point .

Thus, it is possible to accurately calculate the distance between the spectacle frames regardless of the state of wearing the spectacles on the spectacle frame shape measuring apparatus.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an overall configuration diagram of an eyeglass lens supply system in which the eyeglass frame distance calculation method of the present invention is implemented.
An eyeglass store 100 on the ordering side and a factory 200 of a lens maker on the lens processing side are connected by a public communication line 300. Although only one spectacle store is shown in the figure, a plurality of spectacle stores are actually connected to the factory 200.

An eyeglass store 100 is provided with an online terminal computer 101 and a frame shape measuring device 102. The terminal computer 101 includes a keyboard input device and a CRT screen display device, and is connected to a public communication line 300. The eyeglass frame actual measurement value is input from the frame shape measuring device 102 to the terminal computer 101, the terminal computer 101 performs calculation processing, and the eyeglass lens information, the prescription value, and the like are input from the keyboard input device. And terminal computer 1
The output data 01 is transferred online to the mainframe 201 of the factory 200 via the public communication line 300. The terminal computer 101 and the mainframe 2
01, a relay station may be provided. Ma
For the installation location of the terminal computer 101,
It is not limited to the store 100.

The main frame 201 includes a spectacle lens processing design program, a bevel processing design program, and the like. The main frame 201 calculates a lens shape including a bevel shape based on the input data, and outputs the calculation result via the public communication line 300. And returns the result to the terminal computer 101 to display the result on the screen display device. The calculation results are also transmitted to the terminal computers 210, 220, 230, 240, and 250 of the factory 200.
Via the LAN 202.

The terminal computer 210 is connected to a rough rubbing machine (curve generator) 211 and a sanding polisher 212. The terminal computer 210 operates according to the calculation result sent from the main frame 201.
And the sanding grinder 212 are controlled to perform the curved surface finishing of the back surface of the lens whose surface has been processed in advance.

A lens meter 221 and a thickness gauge 222 are connected to the terminal computer 220. The terminal computer 220 sends the measured values obtained by the lens meter 221 and the thickness gauge 222 and the measured values obtained from the main frame 201. By comparing the calculated result with the calculated result, the acceptance inspection of the lens whose curved surface on the back surface of the lens is completed is performed, and a mark (three-point mark) indicating the optical center is given to the passed lens.

The terminal computer 230 has a marker 23
1 and the image processor 232 are connected, and the terminal computer 230 determines a blocking position at which the lens should be blocked (held) at the time of edging and beveling of the lens according to the calculation result sent from the main frame 201. And is used to make blocking position marks. The jig for the block is fixed to the lens according to the blocking position mark.

The terminal computer 240 is connected with an NC-controlled lens grinding device 241 comprising a machining center and a chuck interlock 242. The terminal computer 240 performs edge trimming of the lens according to the calculation result sent from the main frame 201. And beveling is performed.

The terminal computer 250 is connected to a bevel vertex shape measuring instrument 251.
In the case of “0”, the bevel processing of the beveled lens measured by the shape measuring device 251 is compared with the calculation result sent from the main frame 201 to determine whether or not the processing is successful.

The flow of processing until a spectacle lens is supplied in the system having the above-described configuration will be described below with reference to FIGS. Note that there are two types of this processing flow: “inquiry” and “order”. The “inquiry” is performed by a spectacle store so as to notify the expected lens shape at the time of completion of lens processing including beveling. 100 is a request from the factory 200, and “order” is a request from the eyeglass shop 100 to the factory 200 to send a lens before edging or a beveled lens.

FIG. 3 is a flowchart showing the flow of the first input processing in the eyeglass store 100. In the figure, the numbers following S represent step numbers. [S1] The lens order inquiry processing program of the terminal computer 101 of the eyeglass store 100 is started, and the order entry screen is displayed on the screen display device. Optician 100
The operator designates the type of lens to be ordered or inquired by using the keyboard input device while viewing the order entry screen.

That is, whether the lens to be designated, ordered or inquired is a lens which has been subjected to beveling or a lens which is not subjected to edging and beveling, and the thickness of the lens is required to be a minimum. A processing designation for designating the value to be a value, a chamfering for making the edge of the minus lens inconspicuous, and a grinding designation for the portion are performed.

[S2] The color of the lens is specified. [S3] A lens prescription value, a lens processing designation value, eyeglass frame information, layout information for designating an eye point position, a bevel mode, a bevel position, and a bevel shape are input.

The bevel mode includes “1: 1”, “1: 2”, “convex”, “frame”, and “auto bevel” modes depending on where the bevel is set on the lens edge. Select and enter. Here, for example, “convex” is a mode in which a bevel is formed along the lens surface (front surface).

The input of the bevel position is effective only when the bevel mode is "convex", "frame", or "auto bevel", and the position of the bottom of the bevel on the front surface side is located from the front surface of the lens toward the rear surface. Is specified in units of 0.5 mm.

[S4] Here, it is determined whether or not the measurement of the frame shape of the target eyeglass frame by the frame shape measuring device 102 in FIG. 2 has already been completed. If completed, the process proceeds to step S7, and if not completed, the process proceeds to step S5.

[S5] First, in the terminal computer 101 of the spectacle store 100, processing is passed from the lens order inquiry processing program to the frame shape measurement program. Then, the user inputs the measurement number assigned to the spectacle frame whose shape is to be measured. In addition, the material of the frame (metal, plastic, etc.) is specified, and further, whether or not the frame can be bent is specified.

[S6] The eyeglass frame to be measured is fixed to the frame shape measuring device 102, and the measurement is started. The outline of the structure of the frame shape measuring device 102 will be described later with reference to FIG. 5, and the details of step S6 will be described in FIG.
It will be described later with reference to FIG.

The terminal computer 101 performs calculation processing on the measured values measured by the frame shape measuring device 102, and the result is displayed on the screen display device of the terminal computer 101. If there is a large disturbance in the measured values or a large difference between the shapes of the left and right frame frames, an error message to that effect is displayed on the screen display device.

At the spectacles store 100, when an error message is displayed on the screen display device, an inspection is performed according to the content of the error message, and measurement is performed again. [S7] If the frame shape has already been measured and the result is stored, the measurement number given to the spectacle frame is input to read out the stored measurement value.

[S8] According to the measurement number, the stored frame shape information of the corresponding spectacle frame is read from the internal storage medium. According to the above steps S1 to S8
Information, spectacle lens information, spectacle frame information, prescription value, layout
Information, processing instructions that are at least one of processing instruction information
Case data is sent. [S9] The user designates "inquiry" or "order".

Data such as lens information, prescription values, and frame information obtained by executing the above steps are sent to the main frame 201 of the factory 200 via a public communication line.

FIG. 4 is a flowchart showing the flow of processing in the factory 200, and the steps of confirmation and error display performed in the spectacle store 100 by transfer from the factory 200. In the figure, the numbers following S represent step numbers.

[S11] Main frame 2 of factory 200
01 includes an eyeglass lens ordering system program, an eyeglass lens processing design program, and a bevel processing design program. When data such as lens information, prescription values, frame information , layout information, and bevel information are transmitted via a public communication line, the spectacle lens processing design program starts via the spectacle lens order receiving system program, and the lens processing design calculation is performed. Done. That is, bevel
A desired lens shape including the shape is calculated.

That is, it is checked whether or not the outer diameter of the designated lens is insufficient. If the outer diameter of the lens is insufficient, the direction and amount of shortage in the boxing system are calculated, and The processing returns to the eyeglass lens ordering system program for display on the terminal computer 101.

If there is no shortage in the outer diameter of the lens, the front curve of the lens is determined. Next, determine the thickness of the lens, and once the thickness of the lens is determined,
Calculate the prism and prism base directions,
The overall shape of the lens before edging is determined.

Here, the thickness of the edge around the entire circumference is checked for each moving radius in each direction of the frame, and it is checked whether there is a portion below the required edge thickness. If there is a point below, the shortage direction and shortage amount in the boxing system are calculated, and the
The processing returns to the eyeglass lens ordering system program to display the information on the terminal computer 101 of the eyeglass lens 0.

If the thickness of the edge on the entire circumference is not insufficient, the lens weight, the maximum and minimum edge thicknesses, their directions, and the like are calculated. Then, an instruction value for the terminal computer 210 of the factory 200, which is necessary for processing the back surface of the lens, is calculated.

The above operation is performed by the terminal computer 210,
By rough rubbing machine 211 and sanding polishing machine 212,
This is necessary when the lens is polished before the edging, and various calculated values are passed to the next step.

When a stock lens is specified and the lens polishing process is not performed before the edging process, the lens outer diameter, the lens thickness, the front curve, and the back curve are previously determined based on the type and prescription value of the lens. Since they are determined and their data are stored, read out those values and confirm that the outer diameter and edge thickness of the lens are sufficient as in the case of the above-mentioned processed back surface, and proceed to the next step. hand over.

[S12] Next, the main frame 201
Then, the beveling design program is activated via the eyeglass lens ordering system program, and the beveling design calculation is performed.

First, three-dimensional data of the spectacle frame shape is corrected according to the material of the spectacle frame, and errors in the spectacle frame shape data due to the material of the spectacle frame are corrected. Next, the positional relationship between the eyeglass frame shape and the eyeglass lens is determined three-dimensionally based on the eye point position.

Hold lens for beveling
The reference machining origin and the machining axis that is the rotation axis.
Therefore, the coordinates of the data so far are converted into the machining coordinates. So
Then, three-dimensional bevel tip shape(Including bevel trajectory)
Is determined according to the designated bevel mode. That
When changing the 3D bevel tip shape, do not change the bevel circumference.
And the expected amount of deformation
calculate. When the bevel mode is a frame,
Since deformation is not possible when frame bending is not possible,
If there is no bevel without it, an error code to that effect
Output the password.

The calculated deformation amount is compared with a deformation limit amount provided for each material of the eyeglass frame, and if the deformation amount exceeds the limit amount, an error code to that effect is output. In addition,
Since the eyepoint position is shifted by deforming the three-dimensional bevel tip shape, the error is corrected. In addition, correction of a restoration error is also performed. These processes are
It can be done selectively.

As described above, the design calculation of the three-dimensional beveling is performed. [S13] If the designation in step S9 of FIG. 3 is "order", the flow proceeds to step S15, while if "inquiry", the result of the inquiry is transmitted to the eyeglass store 1 via the public communication line.
00 to the terminal computer 101 at step S14
Proceed to.

[S14] Main frame 2 of factory 200
The terminal computer 101 displays the expected shape of the lens or the error state at the time of completion of the beveling process on the screen display device based on the result of the inquiry sent from the terminal 01. The operator of the optician 100 changes or confirms the designated input information according to the displayed content.

That is, if no error has occurred in the machining design calculation in steps S11 and S12 in FIG. 4, the lens thickness and lens weight are sequentially displayed on the screen of the image display device of the terminal computer 101 in FIG. An incoming order entry screen to be displayed, a layout confirmation diagram that visually displays how the lenses are arranged according to the layout information specified in the eyeglass frame, left and right lenses that are framed and spatially arranged in the frame 3D view from any direction, a bevel confirmation diagram that displays the lens shape and the positional relationship between the edge and the bevel in detail, and a left and right bevel balance that unfolds the edge thickness and bevel position of both the left and right lenses along the bevel Display the figure.

If an error has occurred in the machining design calculation in steps S11 and S12 in FIG. 4, a message corresponding to the content of the error is displayed on the screen display device of the terminal computer 101 in FIG. Is done.

[S15] If the designation in step S9 in FIG. 3 is "order", this step is executed and it is determined whether or not an error has occurred in the machining design calculation in steps S11 and S12 in FIG. I do. If an error has occurred, the result is sent to the eyeglass store 10 via a public communication line.
0 to the terminal computer 101 and proceeds to step S17. On the other hand, if no error has occurred, the result is sent to the terminal computer 101 of the eyeglass shop 100 via the public communication line, and the process proceeds to step S16 and to step S18.

[S16] An indication that "the order has been accepted" is displayed on the screen display device of the terminal computer 101 of the spectacles store 100. Thereby, it can be confirmed that the lens before the edging process or the lens after the beveling process that can be reliably framed in the frame can be ordered.

[S17] Since the ordered lens is a lens that cannot be machined due to an error in the lens machining design calculation or the beveling design calculation, an indication that "order cannot be accepted" is displayed.

[S18] If "order" is specified in step S9 and no error has occurred in the lens processing design calculation or bevel processing design calculation, the lens back surface is polished in the factory 200. Performs actual processing such as processing, edge trimming of lenses, and beveling.

That is, the result of the lens processing design calculation in step S11 has been sent to the terminal computer 210 in FIG. 2 in advance, and the lens processing design calculation result is sent by the rough rubbing machine 211 and the sanding grinder 212 according to the calculation result sent. Finish the back surface with a curved surface. Furthermore, dyeing and surface treatment are performed by a device (not shown), and processing up to before the edging is performed.
When the use of the stock lens that has been processed is specified, these processing steps are skipped. Then, the quality inspection of the optical performance and the appearance performance of the spectacle lens processed before the edging is performed. For this test,
The terminal computer 220 of FIG. 2, the lens meter 221,
The thickness gauge 222 is used to make a three-point mark indicating the optical center. In addition, the lens before the edging process is
When the order is made from 00, the lens is shipped to the spectacle store 100 after performing the quality inspection.

Next, based on the result calculated in step S12, the terminal computer 230 and the marker 23 shown in FIG.
1. The block jig for holding the lens is fixed at a predetermined position of the lens by the image processor 232 or the like. The lens fixed to the block jig is mounted on the lens grinding device 241 shown in FIG.

The main frame 201 shown in FIG.
The same calculation as the twelve beveling design calculation is performed to calculate the three-dimensional bevel tip shape. However, in actual processing,
An error may occur between the calculated lens position and the actual lens position. When the coordinate conversion into the processing coordinates is completed, the error is corrected.

Then, based on the calculated three-dimensional bevel tip shape, three-dimensional machining locus data on machining coordinates when grinding with a grindstone having a predetermined radius is calculated. The calculated processing locus data is sent to the NC-controlled lens grinding device 241 via the terminal computer 240. The lens grinding device 241 performs edge trimming and beveling of the lens according to the transmitted data.

Finally, the peripheral length and shape of the beveled vertex of the beveled lens are measured by the terminal computer 250 and the bevel vertex shape measuring instrument 251. The terminal computer 250 compares the design bevel vertex perimeter obtained by the calculation in step S12 with the measurement value measured by the shape measuring instrument 251 and the difference between them is, for example, 0.1.
If it is within mm, it is judged as a pass product. Step S1
The design A size and the design B size of the frame created by the calculation of 2 are compared with the A size and the B size measured by the shape measuring device 251.
If it is within 0.1 mm, it is judged as a passed product.

The finished beveled lens is shipped to the spectacle store 100. FIG.
It is a perspective view which shows the outline of a structure of the frame shape measuring device 102 used for the shape measurement of the spectacle frame performed in step S6 of FIG. In addition, about the frame shape measuring instrument,
There is a detailed disclosure in Japanese Patent Application Laid-Open No. Hei 1-305308 filed by the present applicant, and this embodiment uses the frame shape measuring instrument.

The frame shape measuring device includes a measuring unit 1 for measuring the shape of the spectacle frame Fr of the spectacle frame F held so as not to move to a predetermined position by spectacle frame holding means (not shown). The measuring unit 1 is a U-shaped turntable 2
The rotary table 2 is driven to rotate in the Θ direction by a motor 6 via a timing pulley (not shown), a timing belt 4 and a timing pulley 5 attached to a lower end surface thereof. The angle of this rotation is detected by a rotary encoder 9 connected to a timing pulley (not shown) attached to the turntable 2 via a timing belt 7 and a timing pulley 8. Motor 6
And the rotary encoder 9 are provided on the substrate 10 of the present frame shape measuring instrument (in FIG. 5, only a part is shown in order to make other components of the measuring instrument easy to see, ), And the timing pulley (not shown) and the turntable 2 are rotatably supported on the substrate 10 by bearings (not shown).

The turntable 2 of the measuring section 1 has two side plates 11, 1
2 and a rectangular central plate 13 connecting these two side plates. Two slide guide shafts 14 and 15 are fixed between the side plates 11 and 12 in parallel. A horizontal slide plate 16 is slidably guided in the E direction along the slide guide shafts 14 and 15. For this guidance, the slide plate 16 has three rotatable slide guide rollers 17, 1 on its lower surface.
8 and 19 are provided. In this case, two slide guide rollers 17, 1 are attached to one slide guide shaft 14.
8, one slide guide roller 19 contacts the other slide guide shaft 15, and these slide guide rollers 17, 18, 19, respectively, slide the slide guide shafts 14, 15 so as to sandwich the slide guide shafts 14, 15 from both sides. , 15.

The slide plate 16 has a slide direction E
The slide plate 16 is pulled toward one side plate 12. The constant load spring 20 is wound around a bushing 21, and a shaft 22 and a bracket 23
And is fixed to the side plate 12. Constant load spring 20
Is attached to a slide plate 16. The constant load spring 20 has an operation of pressing a stylus 30 described later against the inner peripheral groove of the spectacle frame Fr.

The movement amount R of the slide plate 16 in the E direction is determined by the reflection type linear encoder 24 as a displacement measuring scale.
Is measured. The linear encoder 24 is mounted on the turntable 2
Scale 25 extending between the side plate 11 and the side plate 12
, A detector 26 fixed to the slide plate 16 and moving along the scale 25, an amplifier 27, and a flexible cable 2 connecting the amplifier 27 and the detector 26.
It consists of eight. The amplifier 27 is mounted on a bracket 29 fixed to the side plate 12.

The movement of the slide plate 16 causes the detector 2 to move.
6 moves while keeping a constant distance from the surface of the scale 25. In response to this movement, the detector 26 outputs a pulse signal to the amplifier 27 connected by the flexible cable 28. The amplifier 27 amplifies this signal and outputs it as a movement amount R via a counter (not shown).

The slide plate 16 holds a stylus 30 as a tracing stylus. The stylus 30 is supported by a slide bearing in a sleeve 31 fixed to the slide plate 16 so as to be movable in the vertical direction (Z-axis direction) and to be rotatable. The stylus 30 has an abacus ball-shaped head 32, which comes into contact with the inner peripheral groove of the spectacle frame Fr by the action of the constant load spring 20, and rotates in the inner peripheral groove of the spectacle frame Fr by the rotation of the turntable 2. Roll along.

At this time, the stylus 30 moves in the radial direction according to the shape of the spectacle frame Fr. The movement amount R in the radial direction is measured by the linear encoder 24 via the sleeve 31 and the slide plate 16 as described above.

The stylus 30 moves in the Z-axis direction corresponding to the curve of the spectacle frame Fr. The Z-axis formed as a displacement measurement scale detects the amount of movement in the Z-axis direction.
It is an axis measuring device 33. The Z-axis measuring device 33 is fixed to the slide plate 16 and controls the movement of the stylus 30 in the Z-axis direction by a built-in charge-coupled device (CCD) line image sensor disposed on both sides of the stylus 30 and a light source. A displacement amount Z is detected by a light emitting diode (LED).

Next, the operation of the frame shape measuring instrument configured as described above will be described. The spectacle frame F is fixedly held by spectacle frame holding means (not shown), the head 32 of the stylus 30 is brought into contact with the V-shaped inner peripheral groove of the spectacle frame Fr, and the motor 6 is rotated by a control device (not shown). Thereby, the turntable 2 connected by the timing belt 4 rotates, and the stylus 30 rolls while contacting the inner circumferential groove of the spectacle frame Fr. The rotation of the measuring unit 1 rotates the rotary encoder 9 connected by the timing belt 7,
It is detected as a rotation angle (θ). The amount of movement of the stylus 30 in the radial direction is detected as the amount of movement R of the slide plate 16 in the E direction by the linear encoder 24, and the amount of movement of the stylus 30 in the vertical direction is determined by the Z-axis measuring device 33.
It is detected as the axial movement amount Z. The values θ, R, and Z forming the cylindrical coordinates are not measured continuously, but are measured intermittently at every predetermined increment of the rotation angle (θ), and are calculated as shown in FIG. Is input to the Therefore, this input coordinate value is hereinafter referred to as three-dimensional measured shape data (Rn, θn, Zn) (n = 1, 2, 3,
.., N). N represents the number of measurements in one rotation.

Hereinafter, in this embodiment, a point sequence, a vector, and the like represented by (n = 1, 2, 3,..., N) using a subscript n Means periodic data whose period is N for this subscript n.

When the turntable 2 makes one rotation, the spectacle frame holding means slides by a predetermined amount while holding the spectacle frame F, whereby the stylus 30 is set on the other spectacle frame, and the shape measurement of the other spectacle frame is performed. Is performed. Since the predetermined slide amount of the spectacle frame holding means is set to a predetermined value in advance, the relative positional relationship between the spectacle frames can be known from the set value and the measurement data of the left and right spectacle frames Fr. This set value is represented three-dimensionally and is hereinafter referred to as relative position data (δX, δY, δZ). These data are also input to the terminal computer 101 of FIG. The terminal computer 101 has various constants such as a radius SR of the stylus 30, an inner circumferential groove angle BA, and an inner circumferential groove width B.
W and the like are input in advance.

FIG. 1 is a flowchart showing the procedure of calculation processing in the terminal computer 101 to which these data have been sent, and corresponds to the processing in step S6 in FIG. In the figure, the numbers following S represent step numbers.

[S601] Three-dimensional measured shape data (R
n, θn, Zn) is strictly the head 3 of the stylus 30.
2 is data representing the locus of the central axis and does not indicate the shape of the inner peripheral groove of the spectacle frame. Therefore, in order to obtain an accurate spectacle frame shape (shape of the inner peripheral groove), the tip (inside) of the stylus 30 is required. The envelope drawn by the portion that contacts the bottom of the circumferential groove must be obtained (in this embodiment, the calculation for obtaining this envelope is called offset calculation). This will be described with reference to FIGS.

FIG. 6 shows the locus 41 of the center axis of the stylus head along the inner peripheral groove shape of the eyeglass frame on one side in three-dimensional coordinates. FIG. 7 shows the stylus projected on the XY plane. FIG. 4 is a diagram showing a locus 41 of a central axis of a head 32 and an inner peripheral groove shape 43 of a spectacle frame on one side.

First, as shown in FIG. 6, measured shape data (Rn, θn, Zn) (n = 1, 2,
,..., N) are transformed into rectangular coordinate values (Xsn, Ysn, Zn) (n = 1, 2, 3,.
N).

Next, as shown in FIG.
3 calculates the inner peripheral groove shape 43 by focusing on the point that the locus 41 of the central axis of the stylus head 32 is deformed by the radius SR of the stylus 30 in the normal direction. That is, the point (X) of the j-th surface of the locus 41 of the central axis of the stylus head 32
sj, Ysj) is defined as (SVxj, S
Vyj), the orthogonal coordinate values (Xj, Yj) of the corresponding inner circumferential groove shape 43 can be obtained by adding the normal vector (SVxj, SVyj) to (Xsj, Ysj). By calculating this from j = 1 to j = N, the inner peripheral groove shape coordinate value (Xn, Yn) (n = 1, 2, 3,..., N)
Is calculated. Note that the Z-axis coordinate value Zn of this inner peripheral groove shape is
Is equal to Zn of the orthogonal coordinate values (Xsn, Ysn, Zn).

[S602] Even if the same spectacle frame is measured, if the shape of the stylus is different, the position of the tip of the stylus head 32 may change and move away from the inner circumferential groove. As a result, the inner peripheral groove shape obtained in step S601 changes. Further, while the radial direction of the stylus head 32 is mechanically always on a plane perpendicular to the Z-axis direction of the frame shape measuring device 102, the spectacle frame has a shape that also changes in the Z-axis direction. Therefore, the inner circumferential groove may be inclined with respect to a plane perpendicular to the Z-axis direction of the frame shape measuring device 102 in some cases. Also in this case, the position of the tip of the stylus head 32 changes according to the inclination. This step is to determine the circumferential shape of the bottom of the inner circumferential groove in consideration of the change in the position of the stylus as described above. Hereinafter, description will be made with reference to FIGS.

FIGS. 8 and 9 are perspective views showing the inner peripheral groove 44 and the stylus head 32. FIG.
FIG. 9 shows a case where the stylus tip does not contact the bottom of the inner circumferential groove but does not change in the axial direction, while FIG.
The case where the tip of the stylus cannot contact the bottom of the inner circumferential groove due to the change in the axial direction is shown. Figure 10 is <br/> Ru Ah in ZX plan view of the inner peripheral groove 44 and the stylus head 32 shown in FIG. 11 Ri XY plan view der of circumferential grooves 44 and the stylus head 32 shown in FIG. 9, FIG. 24 is shown in FIG. 9
FIG. 21 is a plan view passing through a circle 32d. FIG. 12 is a ZX plan view of the spectacle frame and the lens bevel.

When the shape of the spectacle frame does not change in the Z-axis direction as shown in FIG. 8, the contact state between the stylus head 32 and the inner peripheral groove 44 is as shown in FIGS. As shown, the stylus head 32 has the same inner circumferential groove shape.
Varies depending on the shape of Therefore, the distance H between the tip portion 32a of the stylus head 32 and the bottom 44a of the inner peripheral groove 44 is determined.
n is the inner circumferential groove angle BA, groove width BW, stylus head 32
From the tip SA and the width SW of the stylus head 32. That is, as shown in FIG.
In the case of BA, the tip 32a of the stylus head 32 is always
Since it is in contact with the bottom 44a of the inner circumferential groove 44, Hn = 0
Become. Further, as shown in FIG. 10B, SA> BA,
If BW ≧ SW, the upper end 32 of the stylus head 32
b and the lower end 32c contact the wall surface of the inner circumferential groove 44
Then, the height Vb is obtained from SW and SA.
The height Tb is calculated from the distance Hn and the distance Hn based on the following equation.
Ask for. Hn = Tb−Vb Further, as shown in FIG. 10C, SA> BA, and
When BW <SW, the side surface of the stylus head 32 has an inner circumferential groove.
BW and S are in contact with upper edges 44b and 44c of
Find height Vc from A, and height from BW and BA
Tc is obtained, and the distance Hn is obtained based on the following equation. Hn = Tc−Vc

As shown in FIG. 9, when the shape of the spectacle frame changes in the Z-axis direction, the stylus head 32 and the inner circumferential groove 4
The contact state of No. 4 changes depending on a change in an angle TA formed by the inner peripheral groove 44 with a plane perpendicular to the Z-axis direction. Due to this change, the inner circumferential groove shape coordinate value (Xn,
Since an error occurs in Yn), it is necessary to correct this error.

That is, the tip 3 of the stylus head 32
When the angle SA of 2a is equal to or smaller than the inner circumferential groove angle BA, the tip of the stylus head 32 must be the inner circumferential surface regardless of the angle TA formed by the inner circumferential groove 44 with a plane perpendicular to the Z-axis direction. Groove 4
4. Contact the wall of No. 4. Therefore, only the error correction in the contact state between the tip of the stylus head 32 and the wall surface of the inner peripheral groove 44 may be considered. First, the inner circumferential groove angle BA and the angle T
A, two line segments La and Lb formed by intersecting the inner peripheral groove 44 with a flat surface including the tip portion 32a of the stylus head 32 (a plane including the X axis and the Y axis in FIG. 9). Is determined. Then, the tip portion 32 of the stylus head 32
The distance Hn between a and the bottom 44a of the inner peripheral groove 44 is determined from the angle β and the radius SR of the tip 32a of the stylus head 32. That is, first, as shown in FIGS.
A circle having a radius SR of the tip portion 32a of the stylus head 32
Simultaneously touch two line segments La and Lb intersecting at an angle β.
Distance between contact 44d and contact 44e
Ask for. Also, between the upper edges 44b and 44c of the inner circumferential groove 44
Find the distance BDW. Note that the two line segments La and Lb
When not touching the circle of the tip 32a of the stylus head 32
Translates these line segments so that they touch this circle
From the distance SDW. Then, as shown in FIG.
When BDW ≧ SDW, the tip of the stylus head 32
The end 32a has an inner periphery at the contact points 44d and 44e.
Because it is in contact with the wall of the groove 44,
Find the height VSa and calculate the height TS from SDW and β.
a is obtained, and the distance Hn is obtained based on the following equation. Hn = T
Sa-VSa

Further , BDW <as shown in FIG.
In the case of SDW, the tip 32a of the stylus head 32 is
Since it contacts the upper edges 44b and 44c of the inner peripheral groove 44, the BDW
And SR to determine the height VSb, and BDW and
The height TSb is obtained from β, and the distance Hn is obtained based on the following equation.
Confuse. Hn = TSb−VSb The distance Hn thus obtained is calculated over one round of the spectacle frame.
And the correction amount Hn (n = 1, 2, 3,...,
N).

Next, the tip portion 32 of the stylus head 32
When the angle SA of a is larger than the inner circumferential groove angle BA, the upper end 32b and the lower end 32c of the stylus head 32 may have the inner circumferential groove 44 depending on the angle TA formed by the inner circumferential groove 44 with a plane perpendicular to the Z-axis direction. will contact the wall surface 44, the tip 32a of the stylus head 32 is not in contact with the wall surface of the inner peripheral groove 44 necessarily. Therefore, the upper end 3 of the stylus head 32
The correction amount Hn (n = 1, 2, 3,..., 2) also takes into account the state where the lower end 32b and the lower end 32c contact the wall surface of the inner peripheral groove 44.
N). That is, first, the stylus head 32
From the tip 32a to the upper end 32b and the lower end 32c
The position of the inner peripheral groove 44 where it contacts the wall surface is considered.
Here, the shape of the stylus head 32 is the upper end direction and the lower end direction.
Since the direction is symmetric, the stylus head 32
Consider only the area from the tip 32a to the upper end 32b. Figure
As shown in FIG. 9, the tip 32a of the stylus head 32
The center of the circle is O1, and the distance from this center O1 in the Z-axis direction
of the stylus head 32 centered on the point O2 separated by d
When the circle 32d on the side surface is in contact with the wall surface of the inner peripheral groove 44
I do. A plane passing through the circle 32d (parallel to the XY plane in FIG. 9)
(A) is shown in FIG. FIG. 24 (B) shows FIG.
It is a partial enlarged view of (A). In FIG. 24, first,
Horizontal from the bottom 44a of the circumferential groove 44 to the center O2 of the circle 32d
The direction distance ds is obtained. Here, the wall surface line of the inner circumferential groove 44
Bisection of the angle β ^* formed by 44a-44b and 44a-44c
The direction of the line is the vertical direction, and the direction perpendicular to this bisector is
Horizontal direction. ds is the following equation from the angle TA and the distance d.
Is given based on ds = d / tan TA Next, the wall lines 44a-44b of the inner peripheral groove 44 and the circle 32d
When the intersection of the vertical line passing through the center O2 of the 44a ^*
The vertical direction from the bottom 44a of the inner circumferential groove 44 to the point 44a ^*.
The heading distance ts (d) is obtained from the distance ds and the angle β ^* ,
This distance ts (d) is a function using d as a parameter.
ing. By the way, the point 44a ^* is shown in FIGS.
Assuming that the bottom 44a of the inner peripheral groove 44 is
By the same method as the calculation of the distance Hn described with reference to,
The distance hn (d) between the lower end of the circle 32d and the point 44a ^* can be calculated. The distance hn (d) calculated here is a function using d as a parameter. Note that FIG.
And the symbol ( ^* ) indicates the corresponding portion in FIGS. 10 and 11 under such an assumption. More
Here, from the center O2 of the circle 32d to the bottom 44a of the inner circumferential groove 44.
Is calculated based on the following formula.
You. TO (d) = sr (d) + hn (d) + ts (d) sr (d) is the value of a circle 32d expressing d as a parameter.
Radius. TO (d) is a function with d as a parameter
Has become. And the circle 32d is the stylus head 32
From the tip 32a (d = 0) of the stylus head 32
When it is assumed to change to the end 32b (d = SW / 2),
The value d0 of the distance d at which the distance TO (d) becomes maximum is obtained.
Stylus head centered on the position at the distance of this value d0
The circle on the side surface of the portion 32 actually contacts the wall surface of the inner peripheral groove 44
It is a circle. The distance Hn at this time is calculated based on the following equation.
Is done. Hn = TO (d0) -SR Note that the case described with reference to FIG.
Is a rare case, so to increase the calculation processing speed
It may be omitted.

By the way, the shape required for the beveling is the shape of the tip locus of the bevel when it is assumed that the lens after the beveling is fitted to the measured spectacle frame. Here, this is called a bevel tip trajectory shape. As shown in FIG. 12, if the inner peripheral groove angle BA, the inner peripheral groove width BW, and the bevel apex angle YA are determined, the position 55 of the bevel tip trajectory shape is located at a fixed distance from the bottom of the inner peripheral groove. . This distance is referred to as a bevel groove distance BY. In order to determine the bevel tip trajectory shape as the final spectacle frame shape, the obtained correction amount Hn (n = 1, 2, 3,...)
., N) minus the bevel groove distance BY is set as a new correction Hn (n = 1, 2, 3,..., N).

The correction direction of the correction amount Hn is equal to the normal direction of the shape obtained by projecting the inner circumferential groove shape coordinate values (Xn, Yn, Zn) onto the XY plane as shown in FIG. The corrected shape 45 deformed by the correction amount Hn in the normal direction is renewed to the spectacle frame shape coordinate value (Xn, Yn, Zn) (n = 1,
2, 3,..., N).

In this embodiment, the stylus head 3
2 has an abacus ball shape, but the shape of the stylus head is rotationally symmetric with respect to the Z-axis direction, and if the cross-sectional shape including the axis of rotational symmetry is known in advance, the stylus head and the inclined inner circumference The state of contact with the groove 44 can be grasped by calculation, and therefore, it is possible to perform correction in the same manner as described above.

[S603] The spectacle frame shape coordinate values (Xn, Yn, Zn) corrected in step S602 (n = 1,
The peripheral length FLN of the spectacle frame shape (the peripheral shape at the bottom of the inner peripheral groove) is calculated from (2, 3,..., N). Eyeglass frame shape circumference FL
N is calculated by the following equation (1) as the sum of the distances between the points of the spectacle frame shape.

FLN = Σ [((X _i −X _{i + 1} ) ² + (Y _i −Y _{i + 1} ) ² + (Z _i −Z _{i + 1} ) ² ) ^1/2 ] (i = 1 to N) (1) However, in the above equation (1), when i = N, i + 1
Is set to 1.

[S604] In general, when the spectacle frame is held by the frame shape measuring device 102 and the shape of the spectacle frame is measured, the front directions of the left and right spectacle frames are in the Z-axis direction of the frame shape measuring device 102. It is inclined to each.
In order to grasp these inclinations, vectors in the front direction of the left and right eyeglass frames are determined.

In the present invention, the front direction of the spectacle frame is defined by defining the front direction of the spectacle frame as the direction in which the area surrounded by the two-dimensional shape obtained by projecting the spectacle frame on a plane perpendicular to the front direction is the largest. Figure out. There are various methods for defining the front direction of the spectacle frame.

FIG. 13 shows an example of a strict definition method among them. A point G (for example, each of the X, Y, and Z components of the spectacle frame shape coordinate value) located substantially at the center of the spectacle frame shape coordinate value is shown. Of the eyeglass frame shape (Xn, Yn, Zn) (n =
A vector V ending at (1, 2, 3,..., N)
FIG. 3 is a perspective view showing _n (n = 1, 2, 3,..., N). The unit vector FV in the front direction of the spectacle frame can be obtained by the following equation (2) using the vector V _n (n = 1, 2, 3,..., N).

FV = Σ (V _i × V _{i + 1} ) / || Σ (V _i × V _{i + 1} ) || (i = 1 to N) (2) where “×” is a vector , And i + 1 is set to 1 when i = N.

Further, the front direction of the spectacle frame can be approximately obtained. In this embodiment, this approximate method is used, and this method will be described with reference to FIG. FIG. 14 is a perspective view showing the front direction of one eyeglass frame. First, the spectacle frame shape coordinate values (Xn,
Yn, Zn) (n = 1, 2, 3,..., N)
A is the point on the spectacle frame shape where Xn is the maximum value, B is the point on the spectacle frame shape where Xn is the minimum value, C is the point on the spectacle frame shape where Yn is the maximum value, and Yn is the minimum value. A point on the eyeglass frame shape is D. Next, a vector from point A to point B is H, and a vector from point C to point D is V. At this time, the unit vector FV in the front direction of the spectacle frame is defined as a vector perpendicular to the two vectors H and V, and the vector FV is calculated.

[S605] Steps S601 to S604
Is determined for the left and right spectacle frame shape measurement data. If the answer is affirmative (YES), the process proceeds to step S606; if negative (NO), the process proceeds to step S606.
Return to 601.

[S606] The left and right eyeglass frame shape coordinate values (Xn, Yn, Zn) (n = 1, 2, 2) obtained so far.
3,..., N) have different coordinate origins, and are converted into coordinate values of the same coordinates with the same point as the origin using the above-described relative position data (δX, δY, δZ). This will be described with reference to FIG.

FIG. 15 is a perspective view of left and right eyeglass frames arranged on the same three-dimensional rectangular coordinates. First, the right eyeglass frame shape coordinate value (Xn, Yn, Zn) (n = 1, 2, 3, 3)
.., N) in the X-axis, Y-axis, and Z-axis directions, respectively.
X / 2, −δY / 2, −δZ / 2, and calculate the coordinate value and translate the right eyeglass frame shape coordinate value (Xrn, Yr
n, Zrn) (n = 1, 2, 3,..., N), and the front direction unit vector at this time is newly
r.

Next, the left eyeglass frame shape coordinate value (Xn, Y
n, Zn) (n = 1, 2, 3,..., N) on the X axis, Y
ΔX / 2, δY / 2, δZ /
The coordinate value translated in parallel by 2 is calculated, and the left eyeglass frame shape coordinate value (Xln, Yln, Zln) (n = 1, 2, 2)
3,..., N), and the front direction unit vector at this time is set to FVl.

[S607] The front direction of the spectacles is calculated from the front direction unit vectors FVr and FVl of the left and right spectacle frames obtained in step S606, and the left and right spectacle frame shape coordinates are set so that the front direction coincides with the Z-axis direction. Value (Xrn, Yr
(n, Zrn), (Xln, Yln, Zln) and the unit vectors FVr, FVl in the front direction of the left and right eyeglass frames are rotationally moved. This will be described with reference to FIG.

FIG. 16 is a perspective view showing the front unit vectors FVr and FVl of the left and right eyeglass frames and the front unit vector FVM of the eyeglasses. In this embodiment, when the spectacles are worn, the left and right spectacle frames have the same inclination with respect to the plane of the spectacles (the plane perpendicular to the front direction of the spectacles). Unit vector FV
It is defined in the direction of the vector of the sum of r and FVl. That is, the unit vector of this sum vector is set as the unit vector FVM in the front direction of the glasses.

Next, the right eyeglass frame shape coordinate value (Xrn, Yrn, Yrn) is set so that the front direction of the eyeglasses coincides with the Z-axis direction.
Zrn) (n = 1, 2, 3,..., N) and the left frame shape coordinate values (Xln, Yln, Zln) (n = 1,
2, 3,..., N) and the front direction unit vectors FVr, FVl of the left and right eyeglass frames are rotated and moved about the origin to calculate new conversion values.

[S608] Left and right eyeglass frame shape coordinate values (Xrn, Yrn, Zr) converted in step S607.
n), (Xln, Yln, Zln), the angle θd between the datum line of the glasses and the X-axis direction in the XY plane
, So that the datum line coincides with the X-axis direction,
Left and right glasses frame shape coordinate values (Xrn, Yrn, Zrn),
(Xln, Yln, Zln) and the unit vectors FVr, FVl in the front direction of the left and right eyeglass frames are converted. That is, first, using a two-dimensional shape obtained by projecting the left and right spectacle frames onto a plane perpendicular to the calculated front direction of the spectacles, a unit vector in the same direction as a tangent line above the left and right spectacle frames, Is calculated as the direction of the datum line of the spectacles. This will be described with reference to FIG.

FIG. 17 is a plan view showing left and right eyeglass frames projected on the XY plane. First, an angle θa formed by the upper spectacle tangent L1 simultaneously contacting the right and left spectacle frame shapes above the spectacles with the X-axis direction, and the lower spectacle tangent L2 simultaneously touching the right and left spectacle frame shapes below the spectacles with the X-axis direction. And the angle θb. Next, since the angle θd formed by the datum line 46 of the glasses with the X-axis direction is an intermediate angle between the angle θa and the angle θb, an average value thereof is obtained, and the average value is calculated as the angle θ
d.

Next, the right spectacle frame shape coordinate value (Xrn, Yrn, Zrn) (n = n) converted in step S607 so that the datum line of the spectacles coincides with the X-axis direction.
, N) and the left eyeglass frame shape coordinate value (Xln, Yln, Zln) (n = 1, 2, 3,...)
., N) and a new conversion value obtained by rotating the front unit vectors FVr and FVl of the left and right eyeglass frames by the angle θd about the Z axis as the rotation axis is calculated again.

[S609] The left and right eyeglass frame shape coordinate values (Xrn, Yrn, Zr) converted again in step S608.
n), (Xln, Yln, Zln), and calculates the distance between the eyeglass frames. This will be described with reference to FIG.

FIG. 18 is a perspective view of the left and right eyeglass frames showing the distance between the eyeglass frames. In other words, of the right eyeglass frame shape coordinate values (Xrn, Yrn, Zrn), the point S at which Xrn is the maximum value, and the left eyeglass frame shape coordinate value (Xln, Yln,
Zln), a point T at which Xln is the minimum value is obtained,
The length DBL of the vector obtained by projecting the vector from the point S to the point T onto the ZX plane is obtained. This length DBL is the width of the nose, and in this embodiment, the distance between the spectacle frames is represented using the nose width DBL.

Since the distance between the spectacle frames is calculated in this manner, regardless of the mounting state of the spectacle frame with respect to the frame shape measuring device 102, that is, the front direction of the spectacles in the Z-axis direction of the frame shape measuring device 102 Even if does not match, an accurate distance between eyeglass frames can be calculated.

[S610] The left and right glasses frame shape coordinate values (Xrn, Yrn, Zr) converted again in step S608.
n), (Xln, Yln, Zln) and the front-direction unit vectors FVr, FVl of the left and right spectacle frames, the A size, the B size, and the geometric center (frame center) coordinates of the left and right spectacle frame shapes are calculated. In addition, these left and right eyeglass frame shape coordinate values (Xrn, Yrn, Zrn), (Xl
n, Yln, Zln) with the calculated geometric centers as the origin, and the front direction unit vectors FVr,
FVl is converted into coordinate values that are matched in the Z-axis direction. This will be described with reference to FIG. In the following steps S610 to S612, since there is no need to distinguish between the left and right, the spectacle frame shape coordinate values are set to (Xn, Yn, Z
n) (n = 1, 2, 3,..., N) and the unit vector in the front direction of the spectacle frame is described as FV, and these represent both left and right. .

FIG. 19 is an XY plan view of the spectacle frame shape after conversion so that the front direction of the spectacle frame coincides with the Z-axis direction. That is, first, the spectacle frame shape coordinate values (Xn, Yn, Zn) (n = 1, 2, 3,..., N) such that the front unit vector FV of the spectacle frame coincides with the Z-axis direction.
Is rotated around the origin. In the coordinate values (Xn, Yn, Zn) converted by this movement, if the maximum value and the minimum value of Xn are Xmax and Xmin, and the maximum value and the minimum value of Yn are Ymax and Ymin, A of the eyeglass frame shape is obtained. The size 47 is obtained as the absolute value of the difference between Xmax and Xmin, and the B size 48 is obtained as Ymax and Ymi.
It is obtained as the absolute value of the difference from n.

The geometric center (frame center) coordinates (FCx, FCy) are obtained by the following equations (3) and (4). FCx = (Xmax + Xmin) / 2 (3) FCy = (Ymax + Ymin) / 2 (4) Next, conversion is performed first so that the front unit vector FV of the spectacle frame coincides with the Z-axis direction. Glasses frame shape coordinate value (Xn, Yn, Zn) (n = 1, 2, 3,..., N)
Is converted to a coordinate value having the geometric center (FCx, FCy) as the origin.

Further, the coordinate values (Xn, Y
n, Zn) (n = 1, 2, 3,..., N) two-dimensional data (Xn, Yn) (n = 1, 2, 3,..., N)
Is converted to polar coordinate values (Rn, θn) (n = 1, 2, 3,..., N) with the origin at the geometric center (FCx, FCy).

Further, in the polar coordinate values (Rn, θn),
The maximum value of Rn is obtained, and it is doubled to calculate the effective diameter ED. [S611] Eyeglass frame shape coordinate values (Xn, Yn, Zn) with the origin at the geometric center obtained in step S610
(N = 1, 2, 3,..., N) is regarded as being approximately on a closed curve on the toric surface, and the equation of the toric surface is obtained. This will be described with reference to FIG.

FIG. 20 is a perspective view of the spectacle frame 49 for obtaining the equation of the toric surface. In the figure, the center coordinates of the toric surface are (a, b, c), the unit vector in the rotationally symmetric axis direction of the toric surface is (p, q, r), and the center coordinates (a, b, c) of this toric surface ), The radius of the largest circle formed by cutting the toric surface on a plane perpendicular to the rotationally symmetric axial unit vector (p, q, r) is defined as a base radius RB, and the center coordinates (a , B, c), the radius of a circle formed by cutting the toric surface on a plane parallel to the rotationally symmetric axial unit vector (p, q, r) is defined as a cross radius RC.

In order to define the toric surface on three-dimensional coordinates, the center coordinates (a, b, c), the base radius RB, the cross radius RC, the rotationally symmetric axial unit vector (p, q,
r) as a variable, the equation of the toric surface is expressed by the spectacle frame shape coordinate value (Xn, Yn, Zn) (n = 1, 2, 3,...)
, N) using the least squares approximation method to obtain the center coordinates (a, b, c), the base radius RB, the cross radius RC, and the rotationally symmetric axial unit vector (p, q, r). ).

[S612] First, the tilt TILT of the spectacle frame is calculated using the unit vector FV in the front direction of the spectacle frame converted again in step S608. This will be described with reference to FIG.

FIG. 21 is a diagram for explaining the calculation of the tilt TILT of the spectacle frame and the frame PD.
(A) is a perspective view of the tilt TILT of the spectacle frame, FIG. 21 (B)
FIG. 3 is a plan view of an eyeglass frame. That is, FIG.
As shown in (A), the tilt TILT of the spectacle frame is calculated as the angle between the front unit vector FV of the spectacle frame and the YZ plane.

Next, this tilt TILT and step S
Based on the nose width DBL obtained in 609 and the A size obtained in step S610, a frame PD which is a distance between geometric centers is calculated. That is, as shown in FIG. 21B, since the A size differs between the left and right eyeglass frames, if the A size of the right eyeglass frame is Ar and the A size of the left eyeglass frame is Al, the frame PD (FPD) Is calculated by the following equation (5).

FPD = (Ar + Al) / 2 · cos (TILT) + DBL (5) [S613] It is desirable that the left and right eyeglass frames have the same shape, but there are generally some differences. Therefore, in order to balance the left and right spectacle frames, a merge process for matching the left and right spectacle frame shapes is performed. This is shown in FIGS. 22 and 23.
This will be described with reference to FIG.

FIG. 22 is a perspective view for explaining the detection of the difference between the left and right eyeglass frame shapes, and FIG. 23 is a perspective view showing a new eyeglass frame shape. FIG. 23B is an enlarged view of a portion 52 of FIG.

First, the rectangular coordinate values (X) of the left and right eyeglass frame shapes having the origin at each geometric center obtained in step S610.
n, Yn, Zn), a weighted average value is calculated, and the center of gravity of each of the left and right eyeglass frame shapes is calculated. And
After inverting the sign of the X coordinate value of the left eyeglass frame shape, as shown in FIG. The shape 51 is superimposed on the right eyeglass frame shape 50. Here, each direction θ
The sum of the distance Lθi between the left and right eyeglass frames at i is calculated,
This is defined as a difference amount DE between the left and right eyeglass frame shapes.

Next, as shown in FIG. 23A, the right spectacle frame shape 50 is fixed, and the left spectacle frame shape 51 is rotated about the point G so that the difference DE is minimized. I do.
Then, the left spectacle frame shape 53 when the difference amount DE is minimized is the rotation angle θs rotated from the previous spectacle frame shape 51.
And the rotation axis vector AV.

Next, as shown in FIG. 23B, a spectacle frame shape 54 which is intermediate between the left spectacle frame shape 53 and the right spectacle frame shape 50 is calculated. That is, the midpoint M of the left and right eyeglass frame positions in each direction θi is obtained. The spectacle frame shape 54 may be located between the left spectacle frame shape 53 and the right spectacle frame shape 50 and divided at an arbitrary ratio.

Then, the spectacle frame shape 54 is set as a new left and right spectacle frame shape. That is, a coordinate value of the spectacle frame shape 54 is obtained, and the coordinate value of the spectacle frame shape 54 is set as a new right spectacle frame shape coordinate value. However, what is rotated in the opposite direction to the previous direction is set as a new left eyeglass frame shape coordinate value.

Since the shapes of the left and right eyeglass frames have been changed by the above-described merging process, step S61 is performed.
0 to S612 are executed again. It should be noted that the difference amount DE and the rotation angle θs obtained here are values representing the poor balance between the left and right eyeglass frame shapes, so that when these values exceed a predetermined limit value, the merging process is not performed. An error code indicating that the balance between the left and right eyeglass frame shapes is abnormal is output.

In the above embodiment, the merge processing in the three-dimensional shape is shown. However, the two-dimensional merge processing may be performed using only the XY components in the same manner. However, in this case, it is assumed that the eyeglass frame shape is the shape on the toric surface obtained in step S611.

[0124]

As described above, according to the present invention, even if the spectacle frames are arranged at an arbitrary space position with respect to the spectacle frame shape measuring device, each front direction of the spectacle frames, the front direction of the spectacles,
The datum line directions of the glasses are sequentially calculated, and the distance between the glasses frames can be easily calculated based on these data, and the accurate distance between the glasses frames can be calculated.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a procedure of a calculation process in a terminal computer of an eyeglass store, and is shown in step S6 of FIG.
It corresponds to the contents of processing in.

FIG. 2 is an overall configuration diagram of a spectacle lens supply system in which a method for calculating a distance between spectacle frames according to the present invention is performed.

FIG. 3 is a flowchart showing a flow of an initial input process in an eyeglass shop.

FIG. 4 is a flowchart showing the flow of processing in a factory, and the steps of confirmation and error display performed in a spectacle store by transfer from the factory.

FIG. 5 is a perspective view schematically showing the structure of a frame shape measuring instrument.

FIG. 6 is a perspective view of a locus of a central axis of a stylus head along an inner peripheral groove shape of one eyeglass frame;

FIG. 7 is a plan view showing the locus of the central axis of the stylus head projected on the XY plane and the shape of the inner peripheral groove of the eyeglass frame on one side.

FIG. 8 is a perspective view showing an inner circumferential groove and a stylus head.

FIG. 9 is a perspective view showing an inner peripheral groove and a stylus head.

FIG. 10 is a ZX plan view of the inner circumferential groove and the stylus head shown in FIG. 8;

FIG. 11 is an XY plan view of the inner peripheral groove and the stylus head shown in FIG. 9;

FIG. 12 is a ZX plan view of a spectacle frame and a lens bevel.

FIG. 13 is a perspective view showing a vector starting from a point located substantially at the center of the coordinate values of the spectacle frame shape and ending with each coordinate value of the spectacle frame shape.

FIG. 14 is a perspective view showing the front direction of the spectacle frame.

FIG. 15 is a perspective view of left and right eyeglass frames arranged on the same three-dimensional orthogonal coordinates.

FIG. 16 is a perspective view showing a front unit vector of left and right eyeglass frames and a front unit vector of eyeglasses.

FIG. 17 is a plan view showing left and right eyeglass frames projected on an XY plane.

FIG. 18 is a perspective view of the left and right eyeglass frames showing the distance between the eyeglass frames.

FIG. 19 is an XY plan view of the spectacle frame shape after conversion so that the front direction of the spectacle frame coincides with the Z-axis direction.

FIG. 20 is a perspective view of a spectacle frame for obtaining an equation of a toric surface.

FIG. 21 is an explanatory diagram illustrating the calculation of the inclination of the spectacle frame and the frame PD.

FIG. 22 is a perspective view illustrating detection of a difference between left and right eyeglass frame shapes.

FIG. 23 is a perspective view showing a new eyeglass frame shape.

FIG. 24 is a view showing a plane passing through a circle 32d shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Eyeglass store 101 Terminal computer 102 Frame shape measuring device 200 Factory 201 Main frame 202 LAN 210 Terminal computer 211 Roughing machine (curve generator) 212 Sanding grinder 220 Terminal computer 221 Lens meter 222 Thickness gauge 230 Terminal computer 231 Marker 232 Image processing machine 240 Terminal computer 241 Lens grinding device 242 Chuck interlock 250 Terminal computer 251 Shape measuring instrument 300 Public communication line

Claims (4)

(57) [Claims] (1)Eyeglass frame shape measurement with three-dimensional measurement mechanism
For the spectacle frame held at any spatial position in the device,
Eyeglasses measured by the three-dimensional eyeglass frame shape measuring device
From the three-dimensional measurement data of the frame, the data is
Obtain the eyeglass frame pupil distance of the eyeglass frame while performing the conversion
Eyeglass frame distance calculation method, Of the spectacle frame measured by the three-dimensional spectacle frame shape measuring device
From the three-dimensional measurement data, Calculate each front direction of the left and right eyeglass frames
OutSteps to doBased on the calculated front directions of the left and right eyeglass frames,
Calculate the front direction of the mirrorSteps to do, The calculated front direction of the glassesFrom the front of the glasses
The datum line direction of the glasses in a plane perpendicular to
CalculationSteps to doThe respective front directions of the calculated left and right eyeglass frames and the calculated
Front view of the spectacles and the calculated data of the spectacles
Based on theMeasurement of the distance between the eyeglass frames of each left and right frame
The reference point is detected, and the positional information of the eyeglass frame distance measurement reference point is detected.
Based on informationIt is characterized by calculating the distance between eyeglass frames of eyeglasses
To calculate the distance between eyeglass frames. 2. The calculated front directions of the left and right spectacle frames each have a maximum area surrounded by each two-dimensional shape obtained by projecting the left and right spectacle frames on each plane perpendicular to the front direction. 2. The method for calculating the distance between eyeglass frames according to claim 1, wherein the directions are: 3. The spectacle frame between the spectacle frames according to claim 1, wherein the calculated front direction of the spectacles is the direction of the sum of the unit vectors of the calculated front directions of the left and right spectacle frames. Distance calculation method. 4. The calculated datum line direction of the spectacles is the same direction as a tangent line above a two-dimensional shape obtained by projecting left and right spectacle frames onto a plane perpendicular to the calculated front direction of the spectacles. 2. The inter-eyeglass frame distance calculation method according to claim 1, wherein the direction is the direction of the sum of the unit vector and the unit vector in the same direction as the tangent line tangent downward.