JP2000074656A - Edge circumference-length measuring device for spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm that a worked lens accurately engages with a spectacle frame by measuring an edge circumference-length of a spectacle lens when the worked lens is transported from a work center to a spectacles shop. SOLUTION: The circumference length along the frame slot of a spectacle lens frame is acquired in advance with a main frame 201 based on the measured value of a frame shape measuring device 191 while that along an edge ridge of a worked spectacle lens is measured with an edge ridge shape measuring device 251. A terminal computer 250 compares the measured circumference length with a pre-acquired circumference length, and based on the comparison result, the worked spectacle lens is judged whether to accurately engage with the spectacle lens frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel for a spectacle lens used for inspecting whether or not a processed spectacle lens which has been beveled to be fitted to a spectacle lens frame is correctly fitted to the spectacle lens frame. The present invention relates to a circumference measuring device.

[0002]

2. Description of the Related Art Conventionally, in an eyeglass store or the like, an operation of providing eyeglasses with lenses framed in an eyeglass frame to an eyeglass orderer first requires the eyeglass store to prescribe the eyeglass orderer's prescription and use the eyeglasses. Based on the shape and size of the frame,
Determine the lens and order the lens from the lens manufacturer. Then, the spectacle store operates a variety of processing equipment on the lens received from the lens manufacturer, performs edging and beveling based on the prescription, lens information, and spectacle frame information, and displays the processed lens in spectacles. It is framed in the frame. Here, grinding the lens in accordance with the shape of the frame of the spectacle frame is referred to as “edge processing”, and processing for providing a bevel on the edge-finished lens is referred to as “bevel processing”.

[0003] Incidentally, an eyeglass lens processing system in which rimping and beveling performed in an eyeglass store are integrated and performed in a processing center, and furthermore, the eyeglass store and the processing center are connected by a public communication line. However, this is disclosed in, for example, JP-A-4-13539. According to this, a frame shape measuring device is installed in each eyeglass store to generate eyeglass frame shape data, and the data is transferred to the processing center via a public communication line. In the processing center,
A rimming process and a beveling process are performed on a lens designated in advance in accordance with eyeglass frame shape data.

[0004]

However, in this system, since there is no spectacle frame at hand near the processing center, the processed lens after the edging and beveling is accurately applied to the spectacle frame. No confirmation could be made on the machining center side as to whether or not they would fit. Therefore, the processed lens is sent from the processing center to the spectacle store and is framed in the spectacle frame.As a result, the processed lens is too large to fit in the spectacle frame, or conversely, the processed lens and the spectacle frame are There was a possibility that a gap would be created between them.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points. When a processed lens is sent from a processing center to a spectacle store, the bevel circumference of the spectacle lens is measured, and the processed lens is placed in a spectacle frame. It is an object of the present invention to provide an apparatus for measuring a bevel circumference of a spectacle lens capable of confirming that the eyeglasses are fitted correctly.

[0006]

As means for solving the above problems, a means according to the present invention is a lens holding means for holding a beveled spectacle lens substantially horizontal and holding the center from above and below, A tracing stylus having a bevel lens contact portion provided with a groove along a circumference, a tracing stylus moving means for moving along a bevel apex of the processed spectacle lens, and a tracing stylus or a member holding the tracing stylus, A rotation angle measuring means for measuring a rotation angle from a reference point, and a horizontal displacement of the tracing stylus or a member holding the tracing stylus from a reference point is measured in synchronization with the rotation angle measuring means. Horizontal displacement measuring means for measuring the vertical displacement of the tracing stylus or a member holding the tracing stylus from a reference point in synchronization with the rotation angle measuring means. Means, based on the measured values of the rotation angle measuring means, the horizontal displacement measuring means, and the vertical displacement measuring means, a perimeter calculating means for calculating a perimeter along a bevel vertex of the processed spectacle lens; And a bevel circumference measuring device for a spectacle lens comprising:

[0007]

Normally, the spectacle lens frame is deformable, so that the shape of the spectacle lens frame is deformed according to the shape of the bevel provided on the spectacle lens. The length does not change even if the spectacle lens frame is deformed. Focusing on this point, the present invention compares the perimeter along the frame groove of the spectacle lens frame obtained in advance with the measured value of the perimeter along the bevel apex of the processed spectacle lens. If the difference is within the predetermined range, it is determined that the processed spectacle lens is correctly fitted to the spectacle lens frame. Thus, even if there is no eyeglass frame on the processing center side, when sending the processed eyeglass lens from the processing center to the eyeglass store,
It can be confirmed that the processed spectacle lens is correctly fitted to the spectacle lens frame.

The circumference is determined as follows. That is, the beveled spectacle lens is held almost horizontally by the lens holding means, and the center is held from above and below.
The V-shaped groove is fitted to the bevel and moved along the bevel apex, and the rotation angle, horizontal displacement, and vertical displacement of the tracing stylus from the reference point are respectively referred to as rotation angle measurement means, horizontal displacement measurement means, and It is measured by the vertical displacement measuring means. Then, based on these measured values, the circumference along the bevel apex of the processed spectacle lens is calculated by the circumference calculating means.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a spectacle lens supply system in which a method for processing and inspecting a spectacle lens according to the present invention is performed. 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 to perform arithmetic processing, and eyeglass lens information, a prescription value, and the like are input from the keyboard input device.
The output data of the terminal computer 101 is transmitted to the mainframe 2 of the factory 200 via the public communication line 300.
01 is transferred online.

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 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, 250
Via the LAN 202.

A roughing machine (curve generator) 211 and a sanding grinder 212 are connected to the terminal computer 210, and 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 rear surface (rear surface) of the lens whose front surface has been processed in advance.

A lens meter 221 and a thickness gauge 222 are connected to the terminal computer 220, and the terminal computer 220 sends the measured values obtained by the lens meter 221 and the thickness gauge 222 to the terminal computer 220. By comparing the calculated result with the calculated result, an acceptance inspection of the lens whose lens back surface (back surface) has been finished 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. It is also 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 and a chuck interlock 242. The terminal computer 240 performs edge trimming and beveling of the lens according to the calculation result sent from the main frame 201. I do.

The terminal computer 250 is connected to a bevel vertex shape measuring instrument 251.
0 indicates the circumference and the shape of the beveled lens measured and calculated by the shape measuring device 251 in the main frame 2.
The result of the processing is compared with the result of the calculation sent from the step S01. The detailed configuration of the bevel vertex shape measuring instrument 251 will be described later with reference to FIGS.

The flow of processing until a spectacle lens is supplied in the system having the above configuration will be described below with reference to FIGS.
This will be described with reference to FIG. In addition, the flow of this processing includes
There are two types, “inquiry” and “order”. In “inquiry”, the spectacles shop 100 sends the factory 2
00, and “order” means that the spectacle store 100 requests the factory 200 to send a lens before edging or a beveled lens.

FIG. 2 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. The operator of the optician 100 uses the keyboard input device to specify the type of lens to be ordered or inquired while looking at the order entry screen.

That is, whether the lens to be designated, ordered or inquired is a beveled lens or a lens which is not subjected to edging and beveling, and the thickness of the lens Is specified so as to be a necessary minimum value, a chamfer for making the edge of the minus lens inconspicuous, and a polishing specification for the portion are performed.

[S2] The color of the lens is specified.
[S3] The lens prescription value, lens processing designation value, eyeglass frame information, layout information, bevel mode, bevel position, and bevel shape are input. Layout information
The eye point position which is the pupil position on the lens is designated.

As lens processing designation values, lens thickness,
The designated values of the edge thickness, prism, eccentricity, outer diameter, and lens surface curve (base curve) are input. The bevel mode depends on where you make the bevel on the lens edge.
There are “1: 1”, “1: 2”, “convex”, “frame”, and “auto bevel” modes, which are selected and input. Here, for example, “convex” is a mode in which a bevel is formed along the front surface of the lens.

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.

[S4] Here, it is determined whether or not the measurement of the spectacle frame shape by the frame shape measuring device 102 in FIG. 1 has already been completed for the target spectacle frame. 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 spectacle frame to be measured is fixed to the frame shape measuring device 102, and the measurement is started. The frame shape measuring device 102 makes the tracing stylus contact the bevel grooves of the left and right frames of the eyeglass frame, rotates the tracing stylus about a predetermined point, and three-dimensionally detects the cylindrical coordinate value of the shape of the bevel groove, The data is sent to the terminal computer 101. In some cases, the terminal computer 101 performs smoothing of the data, and executes the center coordinate of the toric surface, the base radius, the cross radius, the unit vector in the rotationally symmetric axial direction of the toric surface, or the frame curve (when the frame is on a spherical surface). Curvature of the spherical surface when it can be considered that there is),
Circumference of the bevel groove, frame PD (interpupillary distance), frame nose width, A size and B size which are the maximum widths on the left and right and up and down of the frame, effective diameter (a value twice as large as the maximum radius),
An inclination angle, which is an angle formed by the left and right frame frames, is calculated. Then, these calculated data are displayed on the screen display device. If there is a large disturbance in the data or a large difference between the left and right frame frames, an error message to that effect is displayed on the screen display device.

In the spectacles point 100, when an error message indicating that there is a large disturbance in the data is displayed on the screen display device, there is no fixed substance in the frame groove, the seam of the frame is displaced, or Check that the measurement is not performed with the gap left, and perform the measurement again. Also,
When an error message indicating that there is a large difference between the shapes of the left and right frame frames is displayed on the screen display device, if the difference is allowable, a confirmation is input to confirm that the difference can be maintained. If is not allowed, the eyeglass frame shape may be corrected by hand and measured again, or the average of the left and right shapes may be obtained by calculation, and this may be designated as a merging specification for the eyeglass frame shape value. You may enter it.

[S7] The shape of the spectacle frame has already been measured.
If 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 spectacle frame shape information for the corresponding spectacle frame is read from the internal storage medium. [S9] The user designates "inquiry" or "order".

Data such as lens information, prescription value, 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. While the transmission is being performed, the terminal computer 101 of the eyeglass store 100 displays a message indicating that the transmission is being performed.

FIG. 3 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, and the like are sent via a public communication line, a spectacle lens processing design program is activated via a spectacle lens ordering system program, and a lens processing design calculation is performed.

First, based on the frame shape information, the prescription value, and the layout information, it is confirmed whether or not the outer diameter of the designated lens is insufficient. If the outer diameter of the lens is insufficient, the process returns to the eyeglass lens ordering system program to calculate the shortage direction and the shortage amount in the boxing system and to display the shortage direction and the shortage amount on the terminal computer 101 of the eyeglass store 100.

If there is no shortage in the outer diameter of the lens, the front curve of the lens is determined. For this determination, the left and right prescription values of the lens are first used to determine the left and right front curves separately, and then the left and right front curves are aligned. Note that this step is skipped in the case where the left and right front curves of the aspheric single focus lens are prohibited from being aligned. The table curve referred to here is approximated by a quadratic or quaternary aspherical surface with an aspheric single focus lens, and approximated by a secondary or quadratic aspherical surface in each direction with a progressive multifocal lens, as necessary. Have been.

Next, the thickness of the lens is determined. Normal,
Since the outer diameter of the lens is determined by the prescription value, the thickness of the lens is determined by the outer diameter, the standard edge thickness, and the prescription value. In addition, when the processing specification for setting the lens thickness to the minimum necessary value is set, the cover of the entire circumference for each radius in each direction of the frame is determined by the spectacle frame shape information, the layout information, and the prescription value. The thickness of the lens is checked to determine the thickness of the lens according to the specification.

After the thickness of the lens is determined, the back curve of the lens, the prism, and the prism base direction are calculated, and thereby the overall shape of the lens before the 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 portion that is lower than the predetermined value, the shortage direction and the shortage amount in the boxing system are calculated, and the process returns to the eyeglass lens ordering system program in order to display the shortage direction and the shortage amount on the terminal computer 101 of the eyeglass store 100.

If there is no shortage in the edge thickness of the entire circumference, 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 (rear 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 that has already been processed is designated and the lens polishing processing is not performed before the edging processing, the lens outer diameter, lens thickness, table curve, Since the back curve is determined in advance and those data are stored, read out those values and confirm whether the outer diameter of the lens and the edge thickness are sufficient as in the case of the above-mentioned processed back surface, Pass to the next step. Also in the case of the stock lens, the surface curve of the aspheric single focus lens and the progressive multifocal lens is approximated to the aspheric surface as necessary, similarly to the case of the polished lens.

[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, the three-dimensional data of the spectacle frame shape is corrected according to the material of the spectacle frame, and the error of the spectacle frame shape data caused by the material of the spectacle frame is corrected. Next, the positional relationship between the eyeglass frame shape and the eyeglass lens is determined three-dimensionally based on the eye point position.

A processing origin and a processing axis, which is a rotation axis, which are used as reference when holding the lens for performing the beveling processing, are determined, and the data thus far are coordinate-transformed into the processing coordinates. Then, the three-dimensional bevel tip shape is determined according to the designated bevel mode. At this time, on the assumption that the three-dimensional bevel tip shape is deformed without changing the bevel circumference, the expected deformation amount is calculated. If the bevel mode is frame-based or the frame cannot be bent, it cannot be deformed. If the bevel does not stand without deformation, an error code to that effect is output.

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.

As described above, the design calculation of the three-dimensional beveling is performed. [S13] If the designation in step S9 of FIG. 2 is "order", the process proceeds to step S15, while if "inquiry", the result of the inquiry is sent to the terminal computer 101 of the spectacle store 100 via the public communication line, Proceed to step S14.

[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. 3, 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. 3, 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 of FIG. 2 is "order", this step is executed and step S1 is executed.
It is determined whether an error has occurred in the machining design calculation in step 1 and step S12. If an error has occurred, the result is sent to the terminal computer 101 of the spectacles store 100 via the public communication line, and the process proceeds to step S17.
On the other hand, if no error has occurred, the result is transmitted to the terminal computer 101 of the eyeglass store 100 via the public communication line.
To step S16, and at the same time step S1
8 and thereafter (FIG. 4) to execute the actual machining.

[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 processed because of an error in the lens processing design calculation or the beveling design calculation, an indication that "order cannot be accepted" is displayed.

FIG. 4 is a flowchart showing the actual steps of polishing the back surface of the lens, edging the lens, beveling, inspecting the finished lens, and the like, which are performed in the factory 200. The number following S represents the step number. Hereinafter, FIG.
This will be described with reference to FIG.

[S18] If "order" is specified in step S9 and no error has occurred in the processing design calculation of the lens or the bevel, this step is executed. That is, the result of the lens processing design calculation in step S11 is previously stored in the terminal computer 2 in FIG.
10, the rough rubbing machine 211 and the sanding polisher 2
In step 12, the curved surface of the back surface of the lens is finished in accordance with the transmitted calculation result. Furthermore, dyeing and surface treatment are performed by a device (not shown), and processing up to before the edging is performed. When a stock lens is designated, this step is skipped.

[S19] A quality inspection of the optical performance and the appearance performance is performed on the spectacle lens processed up to before the edging in the execution of step S18. For this inspection, the terminal computer 220, the lens meter 221 and the thickness gauge 222 shown in FIG.
Is used to make a three-point mark indicating the optical center. When the lens before the edging process is ordered from the spectacle store 100, the lens is shipped to the spectacle store 100 after performing the quality inspection.

[S20] Based on the result calculated in step S12, the terminal computer 230 of FIG.
31, the block jig for holding the lens is fixed at a predetermined position of the lens by the image processor 232 or the like. That is, the front of the spectacle lens is photographed with the TV camera by the image processor 232, the photographed image is displayed on a CRT screen, and a layout mark image of the lens before the edging is superimposed on the image. Here, the position of the lens is determined such that the three-point mark applied to the lens matches the layout mark image projected on the CRT screen, and the position where the block jig is to be fixed is determined. Then, a blocking position mark indicating a position where the block jig should be fixed is painted on the lens by the marker 231. The block jig is fixed to the lens according to the blocking position mark.

[S21] The lens fixed to the block jig is mounted on the lens grinding device 241 shown in FIG. Then, in order to grasp the position (inclination) of the lens mounted on the lens grinding device 241, at least three positions of the front surface or the rear surface of the lens specified in advance are measured. The measured value obtained here is stored for use as operation data in step S22.

[S22] The main frame 201 in FIG. 1 performs the same calculation as the beveling design calculation in step S12. However, in actual processing, an error may occur between the calculated lens position and the actual lens position. Therefore, when the coordinate conversion into the processing coordinates is completed, this error is corrected. That is, the error between the calculated lens position and the actual lens position is corrected based on the measured values of the three points measured in step S21.
Otherwise, the same calculation as the beveling design calculation in step S12 is performed to calculate the final three-dimensional bevel tip shape.

Then, based on the calculated three-dimensional bevel tip shape, three-dimensional processing locus data on the processing coordinates when grinding with a grindstone having a predetermined radius is calculated. [S23]
The processing locus data calculated in step S22 is transmitted via the terminal computer 240 to the NC-controlled lens grinding device 24.
Sent to 1. The lens grinding device 241 has a rotating grindstone for grinding and performing beveling and beveling of a lens that is controlled to move in the Y-axis direction (perpendicular to the spindle axis direction). An NC control grinding device capable of at least three-axis control of rotation angle control (spindle shaft rotation direction) and Z-axis control for controlling movement of a grindstone or lens in the Z-axis direction (spindle axis direction) to perform beveling. In accordance with the transmitted data, edge trimming and beveling of the lens are performed. In addition, the lens grinding device 2
41 performs grinding with a grindstone. Instead of this, it is also possible to use a cutting device provided with a cutter and performing cutting.

[S24] Bevel vertex shape measuring instrument 251
To measure the peripheral length and shape of the bevel apex of the beveled lens. That is, the lens which has been processed in step S23 is taken out and attached to the shape measuring instrument 251 with the block jig attached, the bevel vertex measuring probe is brought into contact with the bevel vertex of the lens, and measurement is started. Let it. From the three-dimensional cylindrical coordinate values of the bevel apex measured in this way, the circumference and shape of the bevel apex of the bevel-finished lens are calculated and sent to the terminal computer 250.

Then, the terminal computer 250 calculates the design bevel vertex perimeter obtained by the calculation in step S12,
Compare the measured value measured by the shape measuring instrument 251,
If the difference between them is within 0.1 mm, for example, it is determined that the product is acceptable.

Further, the design A size and the design B size of the frame created by the calculation in step S12 are compared with the A size and the B size measured by the shape measuring device 251. If it is within 1 mm, it is judged as a passing product.

[S25] The bevel position and the shape of the lens after the beveling are compared with the drawing of the beveling position indicated in the processing instruction created based on the result calculated in step S12, and the quality of the bevel is compared. To inspect. Also,
An appearance inspection is performed to determine whether scratches, burrs, chips, or the like have occurred on the lens due to the edging process.

[S26] The beveled lens thus completed is shipped to the spectacle store 100. Next, the bevel vertex shape measuring instrument 251 used in step S24 will be described.

FIG. 5 is a perspective view showing the shape measuring instrument 251.
FIG. 6 is an elevation view of the shape measuring instrument 251 viewed from the direction of arrow B in FIG. In the figure, the completed lens 1 after the beveling is held in a substantially horizontal state with the convex surface on the upper side and the center on the upper side and the lower side. The upper side is held by the block jig 2 already mounted. The block jig 2 is provided with a suction cup 4 made of rubber or the like at the lower end thereof so that the processed lens 1 can be held by suction.

The block jig 2 is attached to the lower end of the arm 5 bent at 90 degrees. The arm 5 is inserted into the stand 6 bent at 90 degrees and is fixed by the screw 7, so that it can be attached and detached in the direction of arrow A. The lower end of the stand 6 is fixed to the substrate 8 which is a portion where the shape measuring instrument 251 does not move.

The lower holder 3 for holding the processed lens 1 from below is rotatably supported by a support rod 10, which is urged upward by a spring (not shown) in the cap 12. ing. Thereby, the completed lens 1
Are pressed from below by the lower holder 3. The cap 12 is fixed to the mounting plate 14 and functions as a guide for vertically moving the support rod 10. The mounting plate 14 is fixed to a covering plate 15 of a measuring section described later.

Next, the measuring section 16 of the shape measuring instrument 251 will be described with reference to FIGS. FIG. 7 is a perspective view showing the shape measuring instrument 251 from which the holding portion of the processed lens 1 in FIG. 5 has been removed. The measuring unit 16
A stylus 17 as a tracing stylus is moved while rolling along the bevel apex of the processing-completed lens 1 held by the block jig 2 and the lower holder 3, and the three-dimensional cylindrical coordinates of each bevel apex at that time. Measure the value. That is, the moving distance, rotation angle, and vertical moving distance of the stylus 17 in the radial direction from the reference point are measured.

The measuring section 16 has a U-shaped turntable 18. The turntable 18 is moved in the Θ direction by a motor 22 via a timing pulley 19, a timing belt 20 and a timing pulley 21 attached to the lower end surface thereof. It is driven to rotate. The rotation angle is determined by the timing belt 2 attached to the timing pulley 19 attached to the turntable 18.
3 is detected by a rotary encoder 25 connected via a timing pulley 24. The motor 22 and the rotary encoder 25 are connected to the substrate 8 of the shape measuring instrument 251.
(In FIG. 7, only a part of the other components of the shape measuring device 251 is shown for easy viewing.) The timing pulley 19 and the turntable 18 are rotatably supported on the substrate 8 by bearings 26. The lower holder 3 is disposed on an extension of the center line of the bearing 26.

The turntable 18 of the measuring section 16 has two side plates 2
7, 28 and a rectangular central plate 29 connecting these two side plates
And consists of A cover plate 15 having an elongated hole 15a (see FIG. 5) for moving the stylus 17 is fixed to the upper surfaces of the side plates 27 and 28. Side plate 27 and side plate 28
Between the two slide guide shafts 30, 31
Are fixed in parallel. A slide plate 32 installed horizontally along the slide guide shafts 30, 31 is slidably guided in the R direction. For this guidance, the slide plate 32 has three rotatable slide guide rollers 33 and 34 on the lower surface thereof. In this case, one slide guide roller (not shown) contacts one slide guide shaft 30 and two slide guide rollers 3 contact the other slide guide shaft 31.
The slide guide rollers 3 and 34 roll along the slide guide shafts 30 and 31 so as to sandwich the slide guide shafts 30 and 31 from both sides.

The sliding plate 32 has a sliding direction R
The slide plate 32 is pulled toward one side plate 27. The constant load spring 35 is wound around a bushing 36, and a shaft 37 and a bracket 38
And is fixed to the side plate 27. Constant load spring 35
Is attached to the slide plate 32. The constant load spring 35 has an effect of constantly pressing the stylus 17 against the top of the bevel of the processing-completed lens 1.

The moving amount r of the slide plate 32 in the R direction is measured by a reflective linear encoder 39 as a displacement measuring scale. The linear encoder 39 is connected to the turntable 18
Scale 40 extending between the side plates 27 and 28
, A detector 41 fixed to the slide plate 32 and moving along the scale 40, a preamplifier 42, and a flexible cable 43 connecting the preamplifier 42 and the detector 41. Preamplifier 42 is side plate 2
7 is attached to a bracket 44 fixed to the bracket 7.

By moving the slide plate 32 in the R direction,
The detector 41 moves while maintaining a certain distance from the surface of the scale 40. In response to this movement, the detector 41 outputs a pulse signal to the preamplifier 42 connected by the flexible cable 43. The preamplifier 42 amplifies this signal and sends it to a counter described later.

The stylus 17 as a tracing stylus is held on the slide plate 32. The stylus 17 is supported in a sleeve 45 fixed to the slide plate 32 by a slide bearing so as to be movable in the vertical direction (Z direction) and rotatable. The stylus 17 comes into contact with the bevel apex of the processing-completed lens 1 by the action of the constant load spring 35, and rolls along the bevel apex of the processing-completed lens 1 by rotation of the turntable 18. The structure of the stylus 17 will be described later with reference to FIG.

At this time, the stylus 17 moves in the radial direction corresponding to the shape of the bevel apex of the lens 1 having been processed.
The amount of movement in the radial direction from the reference point, that is, the amount of movement r in the R direction is, as described above, the sleeve 45 and the slide plate 3.
2 and is measured by the linear encoder 39.

Further, the stylus 17 is used for the processing-completed lens 1.
Move in the Z direction according to the shape of the top of the bevel. The Z-axis measuring device 46 fixed to the slide plate 32 detects the amount of movement in the Z direction. FIG. 8 shows a Z-axis measuring device 46.
(A) is a perspective view, and (B) is a sectional view.

The Z-axis measuring device 46 has a charge-coupled device (C
The slide plate 3 includes a CD) line image sensor 46a and a light emitting diode (LED) 46b as a light source.
2 attached.

The CCD line image sensor 46a and the LE
It is arranged facing D46b. Since the stylus 17 moves up and down between the two in accordance with the shape of the bevel apex of the processing completed lens 1, the boundary between the shadow of the stylus 17 formed on the CCD line image sensor 46a and the bright portion, which is blocked by the stylus 17, also moves up and down. Moving. Therefore, by detecting the distance from the end of the measurement surface of the CCD line image sensor 46a to this boundary, the stylus 1 is detected.
7 can be measured in the Z direction. The CCD line image sensor 46a converts the brightness of each point on the measurement surface into a voltage, and sequentially starts from the end of the measurement surface of the CCD line image sensor 46a in synchronization with an external clock by a start pulse given from the outside. Since a voltage corresponding to this brightness is output, this voltage is binarized by a comparator at an arbitrary level, and a point from the start pulse to a point where the binarized signal changes from 0 to 1, that is, a point from the start point to the point at the boundary of the shadow The amount of vertical movement of the stylus is measured by counting the number of clocks.

FIG. 9 is an elevational view showing a contact portion of the stylus 17 with the bevel apex of the processed lens 1. That is, the stylus 17 has a contact portion 17 having a V-shaped groove formed along the circumference, which matches the shape of a predetermined bevel.
a, and this contact portion 17a is
Abuts on the top 1a of the bevel.

As shown in FIG. 10, the shape measuring device 251 includes a motor rotation limit mechanism 47 for stopping the motor 22 after measuring the shape. FIG. 10 is a partial perspective view showing the motor rotation limit mechanism 47 of the shape measuring instrument 251.

The mechanism includes a rotation limit L bracket 48 fixed to the side surface of the timing pulley 19, and a vertically extending shielding rod 4 operated by the L bracket 48.
9, a shielding plate 50 integrally formed with the shielding rod 49 and extending in the horizontal direction, and the shielding plate 50 and the shielding rod 49.
And two photo-interrupters 52a and 52b cooperating with the shielding plate 50. Spring 5
The other ends of 1a and 51b are attached to the substrate 8.
Similarly, the photo interrupters 52a and 52b are also attached to the substrate 8, and two photo interrupters 52a and 52b are provided corresponding to the normal rotation and the reverse rotation of the turntable 18. The rotation limit L bracket 48 is the shielding rod 4
9, the shielding plate 50 is moved to the photo interrupters 52a, 52
A signal obtained by passing the light through 2b and blocking the light is input to a control circuit described later, and the motor 22 stops.

FIG. 11 is a block diagram showing a configuration of a control device for controlling the operation of the shape measuring device 251 thus configured. That is, the control circuit 53 composed of a microcomputer includes a CCD line image sensor 46a.
The amount of vertical movement of the stylus 17 through the counter 55 is input as the amount of movement z, and the amount of movement of the stylus 17 in the radial direction from the linear encoder 39 through the counter 56 is input as the amount of movement r. . further,
From the rotary encoder 25, the rotation amount of the measurement unit 16 is input as the rotation angle θ. At that time, when the control circuit 53 receives the origin signal of the rotary encoder 25, the control circuit 53 responds to the angle signal of the rotary encoder 25, and the counter value of the linear encoder 39 as r-axis data and the CCD line image as z-axis data. The count value of the sensor 46a is sequentially stored in the memory.

The control circuit 53 receives signals from the photo interrupters 52a and 52b. On the other hand, the control circuit 53 sends a drive signal to the 駆 動 direction drive motor 22, calculates the circumference and shape of the bevel apex of the completed lens 1, and sends it to the terminal computer 250 via the interface 54. I do.

Next, the operation of the shape measuring device 251 thus configured will be described. First, the block jig 2 with the processing completed lens 1 attached is fixed to the shape measuring instrument 251, and the lower holder 3 urged by a spring is pressed from below the processing completed lens 1 to complete the processing. Hold the lens 1. Next, the contact portion 17 of the stylus 17
a is brought into contact with the bevel apex 1a of the processing-completed lens 1.
Then, when a measurement start switch (not shown) is turned on, the motor 22 rotates according to an instruction from the control circuit 53, the turntable 18 connected by the timing belt 20 rotates in the Θ direction, and the contact portion 17a of the stylus 17 is processed. Roll while contacting the bevel vertex 1a of the completed lens 1 (FIG. 12)
reference). Thus, as described above, the rotation angle θ of the stylus 17 from the reference point is detected by the rotation angle of the turntable 18 by the rotary encoder 25. The radial displacement r of the stylus 17 is determined by the linear encoder 39.
As a result, the amount of movement of the slide plate 32 in the R direction is detected. The vertical movement amount of the stylus 17 is detected by the CCD line image sensor 46a as the movement amount z of the stylus 17 in the Z direction.

When the turntable 18 makes one rotation and receives the origin signal again from the rotary encoder 25, the control circuit 53 stops storing the data, and the rotation limit L bracket 48 pushes the shielding rod 49. , The shielding plate 50 is a photo interrupter 52a or a photo interrupter 52.
Block light to b. By inputting a signal obtained thereby to the control circuit 53, the rotation of the motor 22 is stopped.

Based on the data (θ, r, z) obtained by one rotation of the turntable 18, the control circuit 53 corrects the offset by the radius of the contact portion 17 a of the stylus 17 and then completes the processing. The circumference and the shape of the bevel apex of the lens 1 are calculated and sent to the terminal computer 250 via the interface 54.

[0084]

As described above, according to the present invention, the beveled spectacle lens is held substantially horizontal by the lens holding means and the center is held from above and below, and the V-shaped groove of the tracing stylus is fitted to the bevel. Move along the bevel apex, measure the rotation angle, horizontal displacement, and vertical displacement of this tracing stylus from the reference point by the rotation angle measuring means, horizontal displacement measuring means, and vertical displacement measuring means, respectively. Is used to calculate the circumference along the bevel apex of the processed spectacle lens by the circumference calculation means. Thereby, the perimeter along the frame groove of the spectacle lens frame obtained in advance,
By comparing the measured value of the circumference along the beveled vertex of the processed spectacle lens, based on the comparison result, it is possible to determine whether the processed spectacle lens is correctly fitted to the spectacle lens frame, Thereby, even if there is no spectacle frame on the processing center side, when the processed spectacle lens is sent from the processing center to the spectacle store, it can be confirmed that the processed spectacle lens is correctly fitted to the spectacle lens frame. As a result, when the processed spectacle lens is sent from the processing center to the spectacle store and framed in the spectacle frame, the processed spectacle lens is too large to fit in the spectacle frame, or conversely, the processed spectacle lens. Such a problem that a gap is generated between the lens and the eyeglass frame is eliminated.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a spectacle lens supply system in which a method for processing and inspecting a spectacle lens according to the present invention is performed.

FIG. 2 is a flowchart showing a flow of an initial input process in an eyeglass shop.

FIG. 3 is a flowchart showing a flow of processing in a factory, and steps of confirmation and error display performed in an eyeglass store by transfer from the factory.

FIG. 4 is a flowchart showing actual processes such as polishing of the back surface of a lens, edging of a lens, beveling, and inspection of a finished lens performed in a factory.

FIG. 5 is a perspective view showing a shape measuring instrument.

FIG. 6 is an elevation view of the shape measuring instrument as viewed from the direction of arrow B in FIG. 5;

FIG. 7 is a perspective view showing a shape measuring instrument from which a holding portion of a completed lens is removed.

8A and 8B show a configuration of a Z-axis measuring device, wherein FIG. 8A is a perspective view thereof, and FIG.

FIG. 9 is an elevational view showing a portion of the stylus in contact with the bevel apex of the processed lens.

FIG. 10 is a perspective view showing a motor rotation limit mechanism of the shape measuring instrument.

FIG. 11 is a block diagram illustrating a configuration of a control device that controls the operation of the shape measuring device.

FIG. 12 is a partial plan view of the shape measuring instrument showing a measurement state.

[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 Bevel vertex shape measuring instrument

Claims (1)

[Claims] 1. A measuring element having a beveled eyeglass lens substantially horizontal and a center held from above and below, and a measuring element having a bevel lens contact portion provided with a V-shaped groove along the circumference, A tracing stylus moving unit that moves along the bevel apex of the spectacle lens; a rotation angle measuring unit that measures a rotation angle of the tracing stylus or a member that holds the tracing stylus from a reference point; and the rotation angle measurement. In synchronization with the means, a horizontal displacement measuring means for measuring a horizontal displacement from a reference point of the tracing stylus or a member holding the tracing stylus, and the measuring in synchronization with the rotation angle measuring means. A vertical displacement measuring means for measuring a vertical displacement of a probe or a member holding the probe from a reference point, the rotation angle measuring means, a horizontal displacement measuring means, and a vertical displacement. Based on the measured values of the measuring means, the bevel circumference measurement device of a spectacle lens and a peripheral length calculating means for calculating the circumferential length along the bevel apex of the machined spectacle lenses.