JP2000176809A - Method for working end face of spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent stripes from adhering to the flat ground end face of a spectacle lens when the flat ground end face is mirror-polished. SOLUTION: A spectacle lens 6 one surface of which is concave and the opposite surface of which is convex, is brought into pressure-contact with a lens edge polishing grinding wheel 320 having a lens edge polishing groove 310 formed into the shape corresponding to the lens edge, and a flat-ground polishing surface 313 to mirror-polish a flat-ground finished face 6a. The position of the spectacle lens 6 is controlled in X axis direction so that an apex-position A of the spectacle lens 6, at which the convex surface of the spectacle lens 6 intersect the end face 60, falls on a boundary position K between a flank 312 connected to the lens edge polishing groove 310 and the flat-ground polishing face 313 connected to the flank 312 while the end face is polished using the flat-ground polishing face 313 of the grinding wheel 320.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing an end face of a spectacle lens, and more particularly to a flat processing such as flat finishing or mirror finishing applied to an end face after flat finishing.

[0002]

2. Description of the Related Art A cylindrical grinding wheel called a diamond wheel has a bevel groove for forming a bevel on an end surface of an eyeglass lens and a flat surface for flattening the end surface of the eyeglass lens. More specifically, as shown in FIG.
A groove inclined surface 301 for beveling, which has a predetermined angle called the first angle with respect to the axial direction, on the circumferential surface thereof, and is continuous with the groove inclined surface 301 and is smaller than the first angle with respect to the axial direction. The frame includes a flank surface 302 for the eyebrow of the frame having a predetermined angle called a second corner, and a lapping surface 303 for lapping that is continuous with the flank surface 302 and parallel to the axial direction. The flank 302 and the flat finishing surface 303
Is not continuous.

[0003]

Therefore, when the spectacle lens is shifted to the left in the X-axis direction beyond the boundary K during the flattening process, the vertex A of the end surface of the spectacle lens 6 crosses the boundary K, Streaks at the boundary K are formed on the end surface 6a of the spectacle lens 6. If the end face 6a of the spectacle lens 6 has a streak, the finishing accuracy is reduced, the unevenness is reduced, and the fashionability is deteriorated. This has been a particular problem in the case where the flat white finishing surface is further mirror-finished to make it transparent.

In order to solve this inconvenience, a sufficient margin is provided for the length of the flat finishing surface 303 in the axial direction. I did not exceed K. However, as a result, there was a problem that the grindstone 1 was enlarged.

In recent years, there has been a demand for a thin rim in order to reduce the weight of the frame and increase fashionability. However, when the lens fitted to the rim is a thick lens having a large edge, the lens often protrudes from the rim of the frame. In such a case, if the grinding of the lens end surface is finished with a bevel finish, the bevel surface remains white, and an aesthetic problem has been pointed out. Therefore, it takes time and a great deal of cost to perform buff polishing or the like on the remaining white beveled surface by hand. Therefore, there is a demand to perform mechanical polishing with a grindstone. However, there is a problem that the size increase is further increased when a polishing grindstone is connected to an existing grindstone.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method of processing an end face of a spectacle lens which has uniform finishing accuracy, is excellent in fashionability, and can be downsized. Another object of the present invention is to provide a method for processing an end surface of a spectacle lens that can additionally provide a polishing grindstone capable of mirror-finishing the end surface of the spectacle lens without significantly increasing the axial length of the grindstone. Is to provide.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a method for processing an end surface of a spectacle lens, wherein the end surface of the spectacle lens is processed by pressing a spectacle lens against at least a whetstone having a flat processing surface. During processing of the end face using the processing surface, the position of the spectacle lens in the X-axis direction is controlled so that the end of the end face of the spectacle lens does not always exceed the reference position on the grinding wheel. Things.

Here, the “grinding stone having a flat machined surface” includes:
There is a flat grinding wheel having a flat surface, a polishing wheel having a polishing surface for further mirror-polishing the flat surface that has been flattened, and a grinding wheel combining a flat grinding wheel and a polishing wheel. In addition, since it is `` at least '', if there is a grindstone having a flat processing surface, even if there is another component such as a bevel groove having a shape corresponding to the bevel or a flank provided continuously thereto, The case where there is no such other component is included in any case.

When the end of the end surface of the spectacle lens is controlled so as not to always exceed the reference position on the grindstone, it is not necessary to allow a margin in the width of the grindstone as compared with the case where the control is not performed as described above. The size of the grinding wheel can be reduced. Also,
Since the end surface of the spectacle lens is pressed against only the flat processing surface and is controlled so as not to exceed the reference position on the grindstone, no streak is formed on the end surface of the spectacle lens. Therefore, the finishing accuracy is uniform, and the fashionability is improved.

Further, as an example to which the present invention can be suitably applied, the spectacle lens is a spectacle lens having one convex surface and a concave surface on the opposite surface, and the end of the end surface of the spectacle lens is the spectacle lens. Are the apex positions of the convex-side end surface of the spectacle lens where the convex-side surface and the end surface intersect with each other.

In the case of processing the end surface of the spectacle lens having such a shape, since one surface is a convex surface, the vertex position of the convex side end surface of the spectacle lens may not be constant during the processing. Therefore, X of the spectacle lens according to the present invention
The need for axial position control is particularly high.

When the present invention is applied to a spectacle lens having a convex surface on one side and a concave surface on the opposite side as described above, when processing the end surface of the spectacle lens, the spectacle lens is centered on the lens axis. The position control in the X-axis direction of the spectacle lens is such that the vertex position of the convex side end surface of the spectacle lens that changes with the rotation always coincides relatively with the reference position on the grinding wheel. Preferably, the correction is performed in synchronization with the rotation while performing the correction.

If the position of the spectacle lens in the X-axis direction is controlled in synchronization with the rotation of the spectacle lens,
Even when processing the end surface while rotating the spectacle lens, the end surface of the spectacle lens can be pressed against only the flat processing surface, and the end surface of the spectacle lens does not have a streak.
Therefore, the finishing accuracy is uniform, and the fashionability is improved. Furthermore, since the press-contact position of the spectacle lens with respect to the flat processing surface is fixed and does not shift, there is no need to allow a margin in the width of the flat processing surface, and as a result, the length of the grindstone in the width direction can be shortened.

The present invention can also be applied to a case where the grinding wheel has only the flat processing surface. In this case, the reference position on the grinding stone is set to the end of the flat processing surface. do it.

The present invention can also be applied to a case where the grindstone has a bevel groove having a shape corresponding to the bevel and the flat processing surface continuously. In this case, The reference position may be a boundary position between the bevel groove and the flat processing surface.

In this case, the end surface of the spectacle lens is pressed against only the flat processing surface, and the position of the spectacle lens in the X-axis direction is controlled so as not to bend the bevel groove. There is no streak at the boundary between the groove and the flat machined surface. Therefore, the finishing accuracy is uniform, and the fashionability is improved.

[0017] Further, the present invention is directed to a case where the whetstone has a bevel groove having a shape corresponding to a bevel, a flank provided continuously with the bevel groove, and the flat processing surface provided continuously with the flank. In this case, the reference position on the whetstone may be a boundary position between the flank and the flat processing surface.

In this case, since the end face of the spectacle lens does not reach the flank beyond the boundary between the flank and the flat face, the inclination angle between the flank and the flat face is reduced. Even if discontinuous, there is no border line.

In the present invention, the following is an example of the case where the grinding wheel has a bevel groove, a flank, and a flat processing surface.

First, as a first aspect, the whetstone is a bevel-finished whetstone for finishing an end surface of the spectacle lens, the bevel groove is a bevel-finished groove, and the flat processing surface is a flat-finished surface. Plane.

Next, as a second aspect, the grindstone is a polishing grindstone for mirror-finishing the finished end face of the spectacle lens, the bevel groove is a beveled groove, and the flat processing surface is a flat grindstone. There is a case where the surface is a polished surface.

Further, as a third aspect, the whetstone comprises:
A bevel finish grindstone for finishing the end surface of the spectacle lens, and a polishing grindstone for mirror finishing the finished end surface of the spectacle lens are integrally formed on the same axis, these bevel finish grindstones and polishing grindstones, Each having the bevel groove, the flank face, and the flat processing surface, the bevel groove of the bevel finishing wheel is a bevel finishing groove, and the flat processing surface of the bevel finishing wheel is a flat finishing surface. There is a case where the bevel groove of the polishing grindstone is a bevel polishing groove, and the flat processing surface of the polishing grindstone is a flat polishing surface.

Further, as in each of the above embodiments, the grinding stone is
An example in which the present invention can be suitably applied to a case in which a bevel groove, a flank, and a flat processing surface are provided, and the reference position on the grinding wheel is a boundary position between the flank and the flat processing surface. The following can be mentioned. That is, the spectacle lens is a spectacle lens whose one surface is a convex surface and the opposite surface is a concave surface, and the end of the end surface of the spectacle lens is a convex end surface of the spectacle lens where the convex surface and the end surface of the spectacle lens intersect. One that is the vertex position can be mentioned.

At this time, when processing the end surface of the spectacle lens, the spectacle lens is rotated about the lens axis, and the control of the spectacle lens in the X-axis direction is changed with the rotation. It is preferable that the apex position of the convex side end surface of the lens is synchronized with the rotation while being corrected so as to be always consistent with the reference position on the grinding wheel.

In this case, the vertex position of the convex side end surface of the spectacle lens is always at the boundary position between the flank of the grinding wheel and the flat processing surface, and the pressing position of the spectacle lens against the flat processing surface is fixed. Since there is no deviation, it is not necessary to give a margin to the width of the flat processing surface, and as a result, the length of the grinding wheel in the width direction can be shortened.

Further, in the present invention, when the grinding wheel has a bevel groove, a flank surface and a flat processing surface, the bevel groove of the grinding stone has an angle referred to as a first supplementary angle with respect to the axis of the grinding stone. The flank of the grinding wheel is continuous with the slope of the bevel groove, and has an inclination angle called a second supplementary angle smaller than the first supplementary angle with respect to the axis of the grinding stone. Has, the flat processing surface of the whetstone,
It may be configured so as to be continuous with the flank and have an inclination angle called a third supplementary angle smaller than the second supplementary angle with respect to the axis of the grindstone.

In such a case, in addition to the inherent effect of the position control of the spectacle lens in the X-axis direction of the present invention, in addition to the fact that the inclination angle between the flank and the flat processed surface is discontinuous, Since the machined surface is not parallel to the axis of the grindstone but is inclined so as to approach the angle of inclination of the flank, even if the end surface of the spectacle lens touches the boundary between the flank and the flat machined surface (the spectacle lens Since the position control in the X-axis direction is performed, it is originally impossible (not possible), but the end surface of the spectacle lens is hardly streaked. Therefore, it is excellent in fashionability.

In the present invention, the whetstone has a bevel finish whetstone and a polishing whetstone integrally on the same axis.
In the case where each of the bevel grooves, the flank surface, and the flat processing surface has a bevel groove, the bevel groove of each of the bevel finishing grindstone and the polishing grindstone has an angle of 1 to the axis of the grindstone.
The flank faces of the bevel finishing grindstone and the polishing grindstone are each continuous with the inclined face of the bevel groove, and the flank face of the beveled groove and the polishing grindstone have an angle of 1 ° with respect to the axis of the grindstone. It has an inclination angle called a second supplementary angle smaller than the second supplementary angle, and the flat processing surface of each of the bevel finishing grindstone and the polishing grindstone is continuous with the flank surface, and with respect to an axis of the grindstone. It may have an inclination angle called a third supplementary angle smaller than the second supplementary angle.

In this case, since the width of the grindstone can be reduced, a grindstone for bevel polishing can be continuously provided on the bevel-finished grindstone without greatly increasing the grindstone width.

[0030]

Embodiments of the present invention will be described below.

FIG. 3 is a perspective view showing a main part of an internal structure of a so-called balling machine, which is an apparatus for processing an end surface of a spectacle lens for carrying out the method for processing an end surface of a spectacle lens according to the present invention. In FIG. 3, power is transmitted to a grinding wheel 1 which is a rotary cutting diamond wheel by a power transmission mechanism of a pulley 3 and a belt 4 by a rotating wheel motor (not shown). The spectacle lens 6 is pressed against the rotating grindstone 1 via the spindle 5 to cut the spectacle lens 6. The spectacle lens 6 is held at a predetermined position by a lens holding shaft 7 and a lens support shaft 8. The lens holding shaft 7 transmits the rotation of the chucking motor 9 via the belt 10 and the pulley 11,
2 can be moved in the axial direction by being rotationally fed. Thereby, the spectacle lens 6 can be detached.

The rotation of the spectacle lens 6 is performed by synchronous rotation of the lens holding shaft 7 and the lens support shaft 8. The interlocking shaft 16 is rotated by the lens rotation motor 13 and the gears 14 and 15 between the lens holding shaft 7 and the lens support shaft 8, and the power of the pulley 17 provided at both ends of the interlocking shaft 16 and the belt 18 wound around the pulley 17 is provided. Each is rotated by a transmission mechanism via a pulley 19. A homer for providing a lens pattern (not shown, the homer is attached to a position where the bearing 20 is provided) and an unprocessed round spectacle lens 6 are mounted on both ends of the lens support shaft 8. The lens support shaft 8 is linked with the encoder 23 via the gears 21 and 22, whereby the lens support shaft 8
Is measured.

Reference numeral 24 denotes a carriage. The carriage 24 houses the motors 9, 13 and their associated power transmission mechanisms, the lens pressing shaft 7, and the lens supporting shaft 8. The spectacle lens 6 is arranged at the center of a recess formed in front of the carriage 24. The spectacle lens 6 is lowered by the carriage 24 swinging around the slide shaft 25 as shown by the arrow L1, and is pressed against the grindstone 1 by the weight of the carriage 24 and cut. The slide shaft 25 is supported rotatably and slidably in the axial direction by slide bearings 27 held on each of two bearing pedestals 26.

A bearing 32 is fitted to the right end of the slide shaft 25 in the figure so as to be rotatable relative to the slide shaft 25, and an arm 33 is fixed to the bearing 32 near the rear end thereof. In parallel with the slide shaft 25, a belt 34 is provided with a pulley 35 and a pulley 3 of an electromagnetic clutch 36.
It is stretched between seven. The rear end of the arm 33 is fixed to the belt 34 by a fixing plate 38. The electromagnetic clutch 36 is linked to the X-axis motor 41 via gears 39 and 40. Based on this structure, the X-axis motor 41
By operating the slide shaft 25 and the carriage 24
Moves in the axial direction of the slide shaft 25, that is, in the X-axis direction (horizontal direction) as indicated by an arrow L2.

A holding table 42 is fixed to the front end of the arm 33, and a copying plate 43 having a surface having the same radius of curvature as the grindstone 1 is fixed to the holding table 42. In the case of a bearing-like configuration, it is not necessary to have the same curvature). Since the arm 33 moves as described above, a roller 45 is provided between the holding table 42 and a lifting table 44 of a support mechanism provided below the supporting table 42 to support the holding table 42. Roller 45
, The holding table 42 is slidable.

In FIG. 3, reference numeral 49 denotes a Y-axis motor (vertical direction) in the Y-axis direction (vertical direction) as indicated by an arrow L3. By operating the Y-axis motor 49, the elevator 44 is raised and lowered in the vertical direction. be able to. When the elevator 44 is moved up and down, the carriage 24 can be moved around the slide shaft 25 via the arm 33 and the slide shaft 25 as shown by an arrow L1.

In the above description, the carriage 24 is moved in the horizontal direction by the X-axis motor 41, and is moved in the vertical direction by the Y-axis motor 49. By moving the carriage 24 in the horizontal direction or the vertical direction in this manner, the position of the spectacle lens 6 to be processed can be arbitrarily changed in the horizontal direction, and the spectacle lens 6 can be pressed against and separated from the grindstone 1. .

The grinding wheel 1 has a cylindrical shape, and its peripheral surface is formed as a lens cutting surface. A part of the peripheral surface for cutting the grindstone 1 is a cutting surface for roughing the lens, and a V-shaped bevel groove 1a is formed following the cutting surface for rough cutting of the lens. The bevel groove 1a is a portion used when forming a bevel on the lens end surface after rough rubbing. Furthermore, a V-shaped bevel groove 1b used for mirror-polishing the lens end surface after the bevel is formed is formed in another portion. The shape data of these grindstones is used for machining data.

Since the above-mentioned ball milling machine can automatically trace the shape of the frame as described later,
The Y-axis motor 49 can be driven independently without using the profiler 43 (pattern) that follows the homer. That is, the present ball-sliding machine can be used both as a patternless machine and as a pattern machine.

FIG. 4 shows a lens peripheral measuring device 53 for measuring the lens peripheral thickness and the shape data of the peripheral portion of the spectacle lens 6, and the opening / closing door 64 of the measuring instrument storage chamber 63 is opened. It is a perspective view showing a state. In FIG. 3, the lens periphery measuring device 53 is indicated by an imaginary line (two-dot chain line) at a position on the front side of the front recess of the carriage 24 and above the grindstone 1. The first and second tracing styluses 65 and 66 abutting on the front and back surfaces of the spectacle lens having a convex surface on one side and a concave surface on the opposite side are respectively turned at the upper end surface of a shaft 62 that moves up and down in the storage chamber 63. Movable arm 7
2,73. In the figure, each arm is in the retracted position, and the measuring elements 65 and 66 are
2 shows a state in which it is housed inside. In this ball mill, since the measuring device is arranged outside the carriage 24, the lens periphery measuring device 53 can avoid the influence of vibration at the time of lens grinding.

FIG. 5 is a perspective view showing the internal mechanism of the measuring instrument storage chamber 63. Interlocking shaft 7 between left and right of base 61
A belt 80 is hung on two pulleys 79 on the left and right sides of the interlocking shaft 77, although the left side is omitted. The box 78 suspended by two constant load springs 81 (the left side is not shown) on the front surface of the base 61 is configured to move up and down.

A shaft 71 that supports the tracing styluses 65 and 66 at the upper end surface is fixed to the upper plate of the box 78. Here, the rotational positions of the left and right arms 72 and 73 of the tracing styluses 65 and 66 are controlled by central shafts that rotate independently within the shaft 71. A motor (not shown) for rotating the arms 72 and 73 between the measurement position and the retracted position inside the vertical movement box 78, and detects the amount of movement of the arms 72 and 73 in the lens axis direction. An encoder (not shown), a solenoid (not shown) having an operating piece (actuator) for opening the arms 72 and 73 to a predetermined angle at the measurement position, and the like are arranged. Further, rotatable feelers 74 and 75 are provided at the distal ends of the arms 72 and 73 of the measuring elements 65 and 66 so as to abut on the spectacle lens 6.

FIG. 6 shows a configuration diagram of the grinding wheel 1 described above. The grinding wheel 1 of the ball mill is a rough grinding stone 8 for rough cutting formed in a cylindrical shape.
1, a bevel is formed on the lens end surface after roughing or a bevel-finished grindstone 82 for bevel grinding for performing flattening, and the beveled surface after the beveling and the lens end surface after flattening are mirror-finished. A spindle 5 (see FIG. 3) having three grindstones integrally with the grindstone 83 for polishing on the same axis.
Is fixed by a fixing screw.

A V-shaped beveled finishing groove 82a and a beveled polishing groove 83a are formed on the circumferential surface of each of the beveled finishing grindstone 82 and the polishing grindstone 83. In addition, the circumferential surface of each of the beveled finish grooves 82a of the beveled finish grindstone 82 and the polishing grindstone 83 and the left and right sides of the grindstones 82 and 83 located on the left and right of the beveled finish groove 83a is narrow on the left side, which is the convex side of the spectacle lens, and is concave. The right side is wider. If the width of the flank located on the concave side of the spectacle lens is wider than the width of the flank located on the convex side of the spectacle lens, it is possible to correspond to a strong lens having a thick end face of the spectacle lens. The widened circumferential surface on the right side constitutes a flat finishing surface 82c and a flat polishing surface 83c, respectively. In the bevel finishing wheel 82, the finishing flat polishing is performed, and in the polishing wheel 83, Mirror finishing after flattening can be performed respectively.

The beveled groove 82a and the beveled groove 83
The left and right circumferential surfaces of a are not horizontal, but are formed by inclined surfaces whose diameters become slightly larger in the left and right directions (axial direction). This is because in the case of a frame with a large (deep) eyebrow, such as a combination frame (a metal frame with an eyebrow made of plastic attached to the eyebrow), the eyebrow hits the horizontal surface of the end face other than the bevel. This is to form an escape. The widened flat finishing surface 82c and flat polishing surface 83c on the right side have a small inclination angle on the way and approach the horizontal plane (this point will be described later).

A rough whetstone 81 (for example, mesh: # 50-1)
50), beveled finish whetstone 82 (for example, mesh:
In this embodiment, the grinding wheel 83 (for example, mesh: about # 1000 to 4000) substantially changes the rotation of the grinding wheel in each of the steps of roughing, beveling, flattening, and mirror polishing. Instead, the diameter of the grindstone is constant, and is controlled by changing the grain size of the grindstone.
In the illustrated example, only one type of the bevel finishing grindstone 82 and the polishing grindstone 83 are shown. However, since there are usually plural types of bevels, there are also plural types of these grindstones.

FIG. 7 shows a V-shaped bevel groove 1a of the grindstone 1 common to the bevel finishing grindstone 82 and the polishing grindstone 83 and a detailed view of a main part of a peripheral end surface thereof. The bevel groove 1a and its peripheral end face are constituted by two kinds of angles called a first angle θ and a second angle φ. The first angle θ is the two opposite inclined surfaces 1b and 1c of the V-shaped bevel groove 1a corresponding to the bevel of the spectacle lens.
And the vertical line L drawn along the axis of the grindstone 1. The second angle φ is connected to the V-shaped bevel groove 1a,
Left and right inclined surfaces 1d, 1e located outside the bevel groove 1a
Φ1, φ2 between the vertical line L and the vertical line L. The second angle φ is formed for escape of the eyebrows as described above. In FIG. 6, the flank surfaces 82b and 83 formed at the second corners
b shows the boundary by an imaginary line.

As shown in FIG. 8, in order to cut the end face of the spectacle lens 6 using a grindstone 1 having a rough grindstone 81, a bevel finishing grindstone 82, and a grinding grindstone 83 continuously on the same axis, the lens The spectacle lens 6 sandwiched between the holding shaft 7 and the lens support shaft 8 is pressed against the grindstone 1 and a right arrow XR in the X-axis direction is pressed.
As shown by, gradually shift from left to right. Thereby, rough cutting, bevel finishing, and bevel mirror polishing are sequentially performed. In the case of the flattening process in which no bevel is formed, after the roughing, the flattened surface 82 is avoided while avoiding the beveled groove 82a.
c, and successively pressed against the flattened polishing surface 83c. Since the spectacle lens 6 only needs to be pressed against the grindstone 1 relatively,
The grindstone 1 may be pressed against the spectacle lens 6. In each of automatic beveling, forced beveling, and flat sliding modes, which will be described later, the entire edge position of the spectacle lens 6 is measured by the feeler 7 of the lens periphery measuring device 53 (see FIG. 5) as shown in FIG.
4 and 75 are brought into contact with the spectacle lens 6.

FIG. 9 shows the configuration of an electric apparatus for executing the method for processing the end surface of the spectacle lens 6. In FIG. 9, reference numeral 100 denotes an operation control circuit unit which executes various operations for end face processing and performs control using data obtained by the operation, and is configured by a computer. As an input unit, a lens edge position measuring unit 121 and a shape data input unit 120 are provided. Further, an operation panel 110 is provided, and when the operation unit 112 of the operation panel 110 is operated, rough cutting, trial slicing, finishing slicing, polishing, and the like are performed according to the operation content. Operation information such as set values is input to the arithmetic and control circuit unit 100 from the input unit 111 of the operation panel 110.

Bevel processing and bevel mirror processing (hereinafter referred to as “bevel processing”)
In the beveling, various kinds of data are required for the spectacle lens 6 and its end face as described above, but the shape data is temporarily stored in the shape data memory 104 of the arithmetic and control circuit unit 100 from the shape data input unit 120. You. The stored shape data is read out to the beveling data calculation unit 103, and is calculated together with the lens edge position data input from the lens edge position measurement unit 121. The calculation result, the beveling data, is a bevel processing data memory. It is stored in 102. Here, the beveling data memory 102 is a memory for storing control data for beveling to be applied to the X-axis motor 41. The control data differs depending on the type of the bevel. When the grindstone has a plurality of bevels (large bevel and small bevel), the bevel position can be selectively driven by moving in the X-axis direction based on the control data. For example, the types of bevels are different between a plastic frame and a metal frame, and a large bevel is formed on a plastic grindstone and a small bevel is formed on a metal grindstone.

The arithmetic and control circuit section 100 is provided with a processing correction value memory 101 for providing control data to the Y-axis motor 49. The processing correction value memory 101 is a memory for storing correction data required according to the type of spectacle lens and the material of the frame. The correction data differs depending on whether the type of spectacle lens is glass, plastic lens, or whether the cutting pressure needs to be adjusted. Further, in the case of a plastic lens, different cutting data is required because the machinability differs depending on the type of plastic. Also, depending on the material of the frame, such as metal, cell (celluloid), no edge, etc.
Accordingly, since the diameter of the beveled mirror processing is different, it is necessary to prepare correction data according to them.

The control data from the arithmetic and control circuit unit 100 is supplied to a grinding wheel rotation motor 123 via a grinding wheel rotation motor control unit 122 and to a lens rotation motor 13 via a lens rotation drive control unit 124, respectively. Can be
In addition, the Y-axis motor 49 via the Y-axis drive control unit 125, the X-axis motor 41 via the X-axis drive control unit 126, and the lens edge measurement via the lens edge measurement unit drive control unit 127. To the motors 128 for use.

Next, with reference to the flow chart of FIG. 10, the procedure of bevel processing including bevel mirror processing starting from input of shape data will be described.

The spectacle frame selected by the customer at the spectacle store is measured along the lens frame groove by, for example, a three-dimensional spectacle frame measuring device. After the measurement, the measured shape data (ri, θi, xi) is input from the shape data input unit 120 of the device to the arithmetic and control circuit unit 100 (step 20).
1). Specifically, a frame trace of a spectacle frame, a rimless type pattern trace without a spectacle frame, and an edge lens trace of a spectacle lens are performed, and the shape data (two-dimensional or three-dimensional) obtained by these is shaped. The data is input to the shape data memory 104 via the data input unit 120.

Subsequently, layout data of the spectacle lens is input (step 202). To input layout data, the following processing conditions need to be set. The processing conditions include, for example, selection of a cutting type (glass, plastic (allyl or polyurethane based plastic lens having good machinability, special plastic lens having poor machinability (polycarbonate, acrylic)), frame material (celluloid, Metal), frame PD (pupil distance (FPD, DBL)) input, PD (binocular, monocular) input,
Horizontal eccentricity X input, vertical eccentricity Y (Y, EP
H, BXH) input, astigmatic axis Ax input, finish size input, and the like.

Next, a processing mode is set (step 2).
03). As described above, the machining mode includes three types of cutting, namely, automatic beveling, forced beveling, and flattening, and the desired mode is set. In addition, mirror finishing can be set for each. If you select Auto, the computer automatically determines the position where you want to bevel on the end face of the spectacle lens. The position where the bevel is raised can be changed in a predetermined procedure. If you select Force, you can place a bevel at any position. When flat sliding is selected, flat sliding processing that does not make a bevel can be performed.

After setting the processing mode (step 203),
The process waits until the processing start button is pressed from the operation panel 110 (step 204). When the processing is started, the lens edge measuring motor 128 is driven to trace the edge (peripheral edge) of the eyeglass lens (step 205). This edge tracing is performed by the lens periphery measuring device 53 shown in FIGS. 4 and 5 described above. Here, based on the trajectory of the frame shape data, an actual measurement of the edge position of the corresponding lens is performed. The measured value is input from the lens edge position measurement unit 121 to the bevel processing data calculation unit 103 of the calculation control circuit unit 100. The beveling data calculation unit 103 to which the lens edge position measurement value (the convex and concave shape data of the lens including the X-axis direction) and the shape data (frame data) are added, uses various methods for beveling processing by a known method. Ri, θI, Xi) (step 20)
6).

Next, based on the beveling data obtained by the calculation, the end surface of the spectacle lens is processed to fit the spectacle lens 6 into the rim of the spectacle frame. For this purpose, first, the end face of the spectacle lens 6 is rough-processed using the rough whetstone 81 (step 207). That is, the spectacle lens 6 is arranged at a predetermined position shown in FIG. 3 by operating the chucking motor 9 and the lens support shaft 8 and the lens pressing shaft 7. The spectacle lens 6 is pressed against the rough grindstone 81 of the grindstone 1 by applying a required load by operating the X-axis motor 41 and the Y-axis motor 49 based on the trace data. The grindstone rotation motor 123 is driven by the grindstone rotation motor control unit 122 to rotate the grindstone 1, and the lens rotation motor 13 is driven to rotate the spectacle lens 6. Thus, the end surface of the spectacle lens 6 is roughened based on the trace data.

Next, the beveled surface is processed (step 2).
08). Finishing is performed while giving information on the peak position of the bevel and the bevel curve. In this embodiment, in the bevel finish processing, in each part of the lens end face portion,
The vertex position of the bevel peak on the lens end surface is determined by the ratio of the distance between each of the front edge and the rear surface edge and the vertex of the bevel peak in the end face width (lens thickness) direction (for example, 6: 4 or 7:
3) is maintained at the initially selected and set constant value, and the bevel finishing is performed. In order to make a bevel on the end surface of the spectacle lens, a bevel curve (for example, 4
To 7 curves), but how to determine the bevel curve will not be described in detail here.

In the beveled surface machining, the X-axis motor 41 is controlled and driven based on the bevel machining data calculated in step 206 so that the vertex position of the beveled ridge after machining and the deepest portion of the bevel groove of the grindstone 1 match. There is a need to. Therefore, the Y-axis motor 49 is driven to release the spectacle lens 6 from the grindstone 1 by a predetermined amount in order to once separate the spectacle lens 6 having undergone the roughing in step 207 from the grindstone 1.

Next, the X-axis motor 41 is rotated by a fixed amount to move the spectacle lens 6 to the position of the beveling grindstone. Thereafter, the Y-axis motor 49 is driven to lower the carriage 24, and the spectacle lens 6 is pressed against the grindstone 1. The grindstone rotation motor is driven to rotate the grindstone 1, and the lens motor 13 is driven to rotate the spectacle lens 6. The X-axis motor 41 is controlled and driven based on the bevel processing data calculated in step 206. Thereby, beveling is performed.

After finishing the bevel-finished surface processing, the bevel-finished lens is mirror-polished to make the white and opaque bevel surface transparent. At this time, if both of the bevel surfaces are simultaneously processed by the polishing grindstone 83 having a bevel groove corresponding to the bevel, a difference occurs in the mirror surface finish of the two bevel surfaces. Regarding the cause, the present inventors have found that this is because the vertex position of the bevel peak is curved on the edge thickness along the circumferential direction, and the convex side of the lens strongly hits the mirror grinding wheel during polishing. . Therefore, in the present embodiment, so that there is no difference in the finished condition of the bevel both slopes, the degree of the mirror surface,
By controlling the finished lens in the X-axis direction, the concave-side bevel surface and the convex-side bevel surface are divided into two steps to bevel mirror-finish (bevel polishing) (steps 209 and 21).
0).

However, when the bevel polishing is performed twice in this manner, a lens having a good cutting property such as a DEC-based lens and a lens having a poor cutting property such as a polycarbonate-based finishing lens have an X-axis. It is preferable to make a slight difference in the control. (A) Bevel polishing of an allyl-based finish lens with good machinability (Fig. 1) The correction data for a lens with good machinability is "0.0m
m ”is the processing correction value memory 10 of the arithmetic and control circuit unit 100
1 is stored in advance. The edge 175 of the finished lens 76 is 0.1 mm. First, the concave surface of the finished lens 76 is beveled (step 209).

Starting cutting The X-axis motor 41 is driven so that the bevel apex position 176 of the finishing lens 76 is a predetermined amount (for example, 0.1 mm) to the right of the bevel groove center position (the bottom position of the bevel groove) 183 of the grinding wheel 83. 3 mm), and the finishing lens 76 is moved rightward to the concave side of the finishing lens 76 (FIG. 1).
(A)). Therefore, at the start of cutting, bevel apex position 17
6 and the bevel groove center position 183 do not match.

First Cutting The Y-axis motor 49 is driven to lower the carriage 24 in the direction of the outline downward arrow. In the first cutting, the finishing lens 76 is lowered to the position of the temporary size 174, and the cutting allowance 175 A cut-off portion (hatched portion) 175a on the concave side of the finishing lens 76 is cut (FIG. 1B). At this time, a part of the margin on the convex side of the finished lens 76 is also cut. Next, the convex side bevel mirror processing is performed (step 2).
10).

The second cutting X-axis motor 41 is driven to return the bevel cutting position by 0.3 mm as shown by the white left arrow direction, so that the bevel apex position 176 matches the bevel groove center position. The Y-axis motor 49 is driven to lower the finishing lens 76 in the direction of the outline downward arrow to the finishing size position 173, and cut off the convex portion 175b on the convex side of the finishing lens 76 and the remaining polishing unevenness (FIG. 1 ( c)).

End of cutting The Y-axis motor 49 is driven to raise the carriage 24 as shown by the white arrow, and the lens 86 is separated from the grindstone 1. This makes the mirror lens 86 whose bevel surface is mirror-finished.
Is completed (FIG. 1D). (B) Bevel polishing of polycarbonate-based finished lens (Fig. 2) As the correction data for polycarbonate-based lens, "-
“0.1 mm” is stored in the processing correction value memory 101 of the arithmetic and control circuit unit 100 in advance.

The start of cutting is the same as (A) of the bevel polishing cutting method described above.

The first cutting is the same as (A) of the bevel polishing cutting method described above.

The second cutting X-axis motor 41 is driven to set the bevel apex position 176 of the finishing lens 76 to the bevel groove center position 1 of the grinding wheel 83.
In order to displace the lens by a predetermined amount (for example, 0.1 mm) to the left of the lens 83, the finishing lens 7
6 is moved in the direction of the white left arrow, and the polishing grindstone 83 is moved.
Pressing force against Then, the Y-axis motor 4
9 to drive the finishing lens 76 to the finishing position 17
It descends in the direction of the white down arrow to 3. This effectively cuts off the margin 175b on the convex side of the finished lens 76 and the remaining polishing unevenness (FIG. 2).

Finish of cutting The mirror finish is the same as (A).

As described above, in the bevel mirror surface processing of the embodiment, as described in the above (A) and (B), the two beveled surfaces are not polished at the same time, but the concave beveled surface and the convex beveled surface are not polished. Is polished in two stages, and at this time, the end lens is controlled in the X-axis direction so as not to leave a margin or to damage the bevel position. However, high-precision mechanical polishing can be performed without leaving uncut portions. As a result, the beveled surface remaining white can be made transparent.

In the above-described embodiment, of the two beveled surfaces, the concave side is polished first, and then the convex side is polished later when performing mirror finishing. This is because, in the case of the finished lens in the illustrated example (normal meniscus lens), the top of the bevel is deviated to the convex side in the edge thickness direction,
A flat portion that protrudes from the rim of the frame easily exists on the concave side of the beveled surface. Therefore, the flat portion side is polished first so that no polishing residue occurs on the edge of the convex surface side of the beveled surface.

The embodiment described below solves the problems of the finishing accuracy and the fashionability and the problem of increasing the size of the apparatus due to the generation of the streaks in FIG. In the case of flat finishing or mirror finishing performed after flat finishing (hereinafter simply referred to as flat finishing), in order to prevent the end face of the spectacle lens from having streaks, a conventional flat finished surface that has been horizontal is used. In order to make it common with the second angle forming the flank, a certain angle is formed with respect to the axial direction so as to prevent streaks at the boundary. Here, the words of the 1st supplementary angle to the 2nd supplementary angle and the 3rd supplementary angle corresponding to the 1st to 2nd corners are defined.

As shown in FIG. 6 described above, the grindstone 1 includes a rough grindstone 81, a beveled finish grindstone 82, and a grindstone 83 for polishing, having a common axis. Among these, the bevel finishing grindstone 82 and the polishing grindstone 83 are commonly used for beveling, having the first supplementary angle α with respect to the axial direction S in the axial direction S of the circumferential surface of the grindstone as shown in FIG. The groove slope 301 and the groove slope 3
01, the flank 30 for the eyebrow of the frame having a second supplementary angle β smaller than the first supplementary angle α with respect to the axial direction S.
2 and a flat finishing surface 303 for flat finishing that is continuous with the flank surface 302. And flat surface 3
03, a flank 302 with respect to the axial direction S of the grindstone 300;
The third supplementary angle γ is smaller than the second supplementary angle β. The flattening process is, in principle, cut on a horizontal plane. However, if the inclination angle is small, there is no problem even if cutting is performed on the inclined surface. Therefore, the flat finishing surface 303 inclined at the third supplementary angle γ smaller than the second supplementary angle β is formed. The boundary between the flank 302 and the flat finishing surface 303 is the boundary K.

Specifically, assuming that the second supplementary angle β is, for example, 4 ° with respect to the axial direction S, the third supplementary angle γ of the flat finishing surface 303 is also 2 ° with respect to the axial direction S. The angle difference between the supplementary angle β and the third supplementary angle γ is small. With such a small angle difference, even if the end surface of the spectacle lens protrudes from the boundary K, the boundary line is not substantially formed on the end surface of the spectacle lens.

By the way, the angle of inclination between the flank and the polished surface is made small so that the inclination angle at the boundary between the flank and the polished surface is made continuous as much as possible, so that the end surface of the spectacle lens is Even if the boundary is not streaked, generation of the streak cannot be completely avoided as long as the boundary has an angle.
However, in this regard, when the flattening process is performed, if the position of the spectacle lens in the X-axis direction is controlled so that the vertex of the convex side end surface of the spectacle lens does not exceed the boundary, the flattened finish surface is reduced. Even if an inclination angle is not provided, a horizontal plane may be used as before.

Further, as described above, even if the end surface of the spectacle lens is flattened with a flattened surface that is common to the second supplementary angle that forms the flank, the width of the flattened surface does not have a margin. There is no change in the point of addition, so only as much as you can afford
The width of the grindstone 1 is increased, and as a result, the size of the rubbing machine is also increased. However, also in this regard, if the X-axis control is performed so that the spectacle lens does not cross the boundary and always touches the boundary,
There is no need to allow extra width for the whetstone.

An embodiment in consideration of the above points will be described with reference to a grinding wheel 320 of FIG. In the same figure, reference numeral 311 denotes a groove slope of the beveled polishing groove 310, 312
Is a flank, and the flattened polished surface 313 is left with the aforementioned third supplementary angle γ. The boundary K is the reference position (reference point or reference line) of the present invention, and is the boundary position (boundary point or boundary line). Further, information on the shape data of these grindstones is incorporated in the processing data in advance as position data.

The carriage 2 is driven by driving the X-axis motor 41.
4 in the X-axis direction, and as shown in FIG. 13, the vertex A of the convex-side end surface 6a of the spectacle lens 6
Match to the K point on the boundary of 20. Next, the Y-axis motor 49 is driven to lower the carriage 24, and the spectacle lens 6 is pressed against the grindstone 320 (FIG. 13A).

The shape of the spectacle lens after roughing (for example, a lens having a lens power in a meniscus shape) is similar to a frame shape, and the distance between the lens axis center 6c and the lens end surface after roughing ( ri) differs depending on the rotational angle position (θi) of the lens axis. The vertex position of the convex side end surface in the direction in which the distance between the lens axis center 6c and the lens end surface after roughening is the longest is A, and the vertex position of the convex side end surface in the direction in which this distance is the shortest is B ( See FIG. 14).

Then, the X-axis motor 41 is driven to move the carriage 24 in the X-axis direction, and as shown in FIG. 13, the grinding wheel indicating the origin A of the convex side end surface 6a of the spectacle lens 6 by a virtual line. Align with the K point of the 320 boundary line. Next, the Y-axis motor 49 is driven to lower the carriage 24, and the spectacle lens 6 is pressed against the grindstone 320.

Thereafter, when the lens axis is rotated while maintaining the state where the lens end face is pressed against the grindstone 320, the lens has a meniscus shape when the lens end face including the vertex B is pressed against the grindstone 320. The point K is relatively inside the lens end face. Therefore, in order to avoid this, while correcting the convex side end face of the spectacle lens 6 to be relatively coincident with the point K, the spectacle lens is driven by the X-axis motor 41 in synchronization with the rotation of the lens axis (θi). The movement control in the X-axis direction 6 is performed.

For this purpose, the arithmetic and control circuit unit 100 controls the X-axis motor 41 to move the carriage 24 and the spectacle lens 6 in the X-axis direction and to move the carriage 24 and the spectacle lens 6 at an arbitrary position and an end surface of the lens 6 at an arbitrary cutting depth. Polishing is performed while changing the apex position so that the apex position of the convex side end surface always coincides with the boundary K.

When the position of the spectacle lens 6 in the X-axis direction is controlled such that the vertex A of the convex side end surface of the spectacle lens 6 is constantly pressed against the boundary K of the grinding surface 313 of the grindstone 320, 6 does not cross the boundary K, so that the end face of the spectacle lens 6 is not streaked by the boundary K. In addition, since the locus of the vertex A of the convex side end surface is always controlled to continuously pass on the boundary line of the grindstone 320 connecting the boundary K in the circumferential direction, the plane 313 having an extra length is unnecessary. As a result, the width of the grindstone 320 can be reduced.
In the present specification, in the X-axis control of the lens axis of the boundary point K of the grinding wheel, the boundary point K is not exactly one point, but is used in a meaning including a position in the vicinity thereof where the effect of the present invention is not lost. are doing.

The width reduction of the grinding wheel described above can be similarly applied to the case of the bevel finishing wheel.

More specifically, the width of the flat processing surface (flat polishing surface, flat polishing surface), which was 24 mm conventionally, is 20 mm for the finishing whetstone and 20 mm for the polishing whetstone including the beveled portion.
And could be shortened together.

According to the above-described embodiment, even if the width of the grindstone is not sufficient, no border line is formed on the end surface of the spectacle lens, and the finishing accuracy of the end surface processing of the spectacle lens becomes uniform. Further, since the width of the grindstone can be reduced, the polishing grindstone 83 can be additionally provided without greatly increasing the width of the grindstone.

In the above-described embodiment, the X-axis is controlled so that the vertex of the convex side end surface always coincides with the boundary K. However, the control is free within the flat polishing surface 313. Even if the control is performed so as not to exceed, the boundary K can be prevented from being streaked. Various motors used in the embodiments are preferably stepping motors. In the embodiments, the minus lens has been described. The present invention can be similarly applied to a plus lens.

[0090]

As described above, according to the present invention, during processing of the end surface using the flat processing surface of the grindstone, the end of the end surface of the spectacle lens does not always exceed the reference position on the grindstone. Since the position control of the spectacle lens in the X-axis direction is performed, the end face of the spectacle lens can be prevented from having a streak, the finishing accuracy can be uniform, the fashionability can be improved, and the width of the grindstone can be improved. Since there is no need to provide a margin, the size of the grinding wheel can be reduced.

[Brief description of the drawings]

FIG. 1 is a process chart of a bevel polishing and cutting method according to an embodiment.

FIG. 2 is a main part process view of a bevel polishing and cutting method according to another embodiment.

FIG. 3 is a perspective view showing a main structure of an eyeglass lens end face processing apparatus according to an embodiment;

FIG. 4 is a perspective view of the lens periphery measuring device according to the embodiment.

FIG. 5 is a perspective view showing the internal structure of the lens periphery measuring device according to the embodiment.

FIG. 6 is a configuration diagram of a grindstone according to the embodiment.

FIG. 7 is a main part configuration diagram of a bevel grinding wheel according to the embodiment.

FIG. 8 is an explanatory diagram of end face processing and lens measurement of the spectacle lens according to the embodiment.

FIG. 9 is a configuration diagram of an electrical control system for performing the eyeglass lens end face processing method of the embodiment.

FIG. 10 is a flowchart illustrating a method of processing an end surface of a spectacle lens according to an embodiment.

FIG. 11 is an explanatory view showing a conventional flattening method.

FIG. 12 is an explanatory view of a main part of a grindstone used in the flattening process of the embodiment.

FIG. 13 is a process diagram illustrating a flattening method according to the embodiment.

FIG. 14 is an explanatory diagram of a relationship between a rotation angle position of a lens axis and a distance to a lens end surface after rough rubbing according to the embodiment.

[Explanation of symbols]

 Reference Signs List 6 spectacle lens 6a flat finishing surface 6c lens axis center 320 bevel polishing grindstone 310 bevel polishing groove 312 flank 313 flat polishing polishing surface 320 polishing grindstone A vertex position of convex side end face of spectacle lens K boundary position

Claims (10)

[Claims] 1. A method for processing an end surface of a spectacle lens by pressing an eyeglass lens against at least a grindstone having a flat processing surface to process the end surface of the spectacle lens, wherein the processing of the end surface using the flat processing surface of the whetstone In the method, the position of the eyeglass lens is controlled in the X-axis direction such that the end of the end surface of the eyeglass lens does not always exceed a reference position on the grinding wheel. 2. The eyeglass lens processing method according to claim 1, wherein the eyeglass lens is a spectacle lens having a convex surface on one surface and a concave surface on an opposite surface. A method for processing an end surface of an eyeglass lens, comprising: a vertex position of a convex end surface of the spectacle lens where a convex surface and an end surface of the lens intersect. 3. The method of processing an end surface of a spectacle lens according to claim 2, wherein when processing the end surface of the spectacle lens, the spectacle lens is rotated about a lens axis, and the X-axis direction of the spectacle lens is Position control is performed in synchronization with the rotation while correcting the vertex position of the convex side end surface of the spectacle lens that changes with the rotation so that the vertex position always coincides relatively with the reference position on the grinding wheel. A method for processing an end surface of a spectacle lens, comprising: 4. The method for processing an end surface of an eyeglass lens according to claim 1, wherein the whetstone has only the flat processing surface, and a reference position on the whetstone is the position of the flat processing surface. An end surface processing method for an eyeglass lens, wherein the end surface is an end portion. 5. The method for processing an end surface of an eyeglass lens according to claim 1, wherein the grindstone has a bevel groove having a shape corresponding to a bevel and the flat processing surface, wherein: A method of processing an end surface of a spectacle lens, wherein the reference position on the grindstone is a boundary position between the bevel groove and the flat processing surface. 6. The method for processing an end surface of an eyeglass lens according to claim 1, wherein the grindstone has a bevel groove having a shape corresponding to the bevel, a flank connected to the bevel groove, and An end surface processing method for an eyeglass lens, comprising: the flat processing surface connected to a flank surface; and a reference position on the grindstone is a boundary position between the flank surface and the flat processing surface. 7. The eyeglass lens end surface processing method according to claim 6, wherein the whetstone is a beveled finish whetstone that finishes an end surface of the spectacle lens, the bevel groove is a beveled groove, An end surface processing method for an eyeglass lens, wherein the flat processed surface is a flat-finished surface. 8. The method for processing an end surface of an eyeglass lens according to claim 6, wherein the grindstone is a polishing whetstone for mirror-finishing a finished end surface of the eyeglass lens, the bevel groove is a beveled groove, The end surface processing method for an eyeglass lens, wherein the flat processing surface is a flat polished surface. 9. The spectacle lens end surface processing method according to claim 6, wherein the whetstone is a bevel finish whetstone that finishes the end surface of the eyeglass lens, and a polishing whetstone that mirror-finishes the finish end surface of the eyeglass lens. Are integrally formed on the same axis.The beveled finish grindstone and the polishing grindstone have the beveled groove, the flank face, and the flat processing surface, respectively, and the beveled groove of the beveled finish grindstone is , A beveled finish groove, the flat processing surface of the beveled grinding wheel is a flat polished surface, the beveled groove of the polishing wheel is a beveled polishing groove, and the flat processed surface of the polishing wheel is Is a method of processing an end surface of a spectacle lens, wherein the surface is a flat polished surface. 10. The method for processing an end surface of an eyeglass lens according to claim 6, wherein the bevel groove of the whetstone has an angle of 1 to an axis of the whetstone.
The flank of the grindstone is continuous with the inclined surface of the bevel groove, and is smaller than the first supplementary angle with respect to the axis of the grindstone. The flat processing surface of the grinding wheel is continuous with the flank, and has an inclination angle called a third supplementary angle smaller than the second supplementary angle with respect to the axis of the grinding stone. A method for processing an end surface of a spectacle lens, comprising: