JP2006159398A - Elastic polishing tool and polishing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic polishing tool capable of polishing without causing unnecessary scratches on a surface to be polished, and a polishing method using the same.
An elastic polishing tool 1 includes an elastic polishing body 3 having elasticity capable of changing its shape following a surface 5a to be polished of an eyeglass lens 5 and elasticity appearing in a cross section including a rotation axis of the elastic polishing tool 1. A polishing pad 4 having a diameter larger than the length of the arc AB of the polishing body 3 and attached to the surface 31 facing the surface to be polished 5a of the elastic polishing body 3 is provided, and the elastic polishing tool 1 rotates and swings. The lens 5 is in contact with the surface 5a to be polished and polished while rotating.
[Selection] Figure 3

Description

  The present invention relates to a polishing tool and a polishing method for polishing an optical surface of an optical element such as a lens, and more particularly to an elastic polishing tool and a polishing method suitable for use in polishing an aspherical shape.

  Conventionally, a concave surface such as a spectacle lens is formed into a spherical shape, a rotationally symmetric aspherical surface, a toric surface, a progressive surface, or a curved surface obtained by combining these by cutting or the like, and is mirror-polished to finally become an optical surface. The For mirror polishing of a simple curved surface such as a spherical surface or a toric surface, rubbing polishing using a rigid polishing dish is used. The mirror polishing method using a polishing dish is a method of transferring the surface shape of the polishing dish to the surface to be polished, so it is necessary to have as many processing dishes as the number of surface shapes corresponding to the lens prescription. It extends.

In addition, for polishing a complicated curved surface such as a progressive surface, that is, a so-called free curved surface shape, an elastic polishing tool is generally used because it cannot be polished by a polishing method using a polishing dish.
As a method using an elastic polishing tool, for example, a polishing method using a balloon-type polishing tool is known (for example, see Patent Document 1). In this method, pressure gas is sent to the inside of a balloon-type polishing tool, the balloon-type polishing tool is inflated with internal pressure, the curvature is changed by changing the internal pressure, and the curvature matches the curved surface shape of the surface to be polished. Since polishing is performed and the curvature of the concave surface can be followed, a single type of balloon-type polishing tool can be applied to a large number of surfaces to be polished.

  Furthermore, a partial polishing method using a small dome-shaped elastic polishing tool that contacts a part of the surface to be polished is also known (for example, see Patent Document 2). In the partial polishing method, an elastic polishing tool that is smaller than the average curvature radius calculated from the shape of the surface to be polished and that is closest to the average curvature radius is selected, and a part of the surface to be polished is rotated while rotating the elastic polishing tool. Then, the entire surface to be polished is scanned by scanning the entire surface to be polished.

JP 2003-275949 A JP 2000-317797 A

  However, the polishing method using a balloon-type polishing tool has a short polishing time because the balloon-type polishing tool is applied to the entire surface to be polished. However, if the internal pressure is increased, the flexibility is lost and the followability to the shape is poor. Therefore, uneven polishing may occur. On the other hand, if the internal pressure is lowered, the contact with the surface to be polished becomes weak and polishing may not be performed sufficiently.

  In addition, the partial polishing method using a small dome-shaped elastic polishing tool performs entire polishing by scanning the entire surface to be polished, which requires time to scan. However, since polishing can be performed efficiently, total polishing is performed. The time will not be prolonged. Further, since the polishing tool is made of an elastic body, the elastic body can change the shape following the surface to be polished in the portion in contact with the surface to be polished. There is an advantage that uneven polishing is less likely to occur on the surface. However, since a small dome-shaped elastic polishing tool has a curvature smaller than the diameter of the surface to be polished and smaller than the average curvature of the surface to be polished, it is elastic to the surface to be polished when scanning the entire surface to be polished. There exists a subject that the edge part of a grinding | polishing tool contacts and gives an unnecessary flaw to a to-be-polished surface.

  Further, in most spectacle lenses, the spectacle lenses after polishing before being put into the spectacle frame are mostly those having a circular outer diameter. In recent years, however, eyeglass lenses have become thinner, and are processed so that the thinnest center thickness can be obtained from eyeglass frame data and prescription using a computer or the like. The production of thin lenses that are oval and polished to an outer shape with sharp edges tends to increase. The substantially elliptical shape is a non-circular shape including at least an arc in the outline of the outer peripheral portion, and examples thereof include an oval shape and a track shape.

However, when polishing a lens with a balloon-shaped polishing tool when polishing a lens whose lens outer shape is substantially elliptical and has a sharp edge, the edge portion of the lens bites into the polishing pad attached to the balloon polishing portion. There is a problem that the polishing pad is peeled off or the lens or polishing tool to be polished is damaged. In order to prevent this, if the internal pressure of the balloon polishing part is increased, the flexibility is lost and the followability to the shape is deteriorated, and a non-polished range or polishing unevenness may occur.
On the other hand, in the case of a partial polishing method using a small dome-shaped elastic polishing tool, the elastic polishing tool intermittently contacts the portion in contact with the surface to be polished, so that the edge of the lens bites into the polishing pad, There is a problem that the lens or polishing tool to be peeled off or damaged is damaged.

  Therefore, the present invention has been made in view of such circumstances, and can be polished without causing unnecessary scratches on the surface to be polished and without damaging the lens or polishing tool to be polished. An object is to provide an elastic polishing tool and a polishing method using the same.

  In order to solve the above-mentioned problems, the elastic polishing tool of the present invention can change its shape in accordance with the surface to be polished in the elastic polishing tool used for polishing while contacting and rotating the surface to be polished. An elastic polishing body having elasticity; and a polishing pad attached to a surface of the elastic polishing body facing a surface to be polished, wherein the polishing pad appears in a cross section including a rotation axis of the elastic polishing tool. It has a diameter larger than the length of the arc.

  According to this, the polishing pad attached to the surface side of the elastic polishing body of the elastic polishing tool has a diameter larger than the arc length of the elastic polishing body appearing in the cross section including the rotation axis of the elastic polishing tool, Since the polishing pad is attached to the entire surface including the edge portion of the elastic polishing body and the elastic polishing body is not exposed, only the polishing pad is covered when polishing while rotating while rotating the elastic polishing tool against the surface to be polished. Contact with the polishing surface. Therefore, mirror polishing can be performed without causing unnecessary scratches on the surface to be polished. In addition, even in a lens having an approximately oval lens outer shape and a sharp edge, a polishing pad is affixed to the entire surface including the edge of the elastic polishing body, and the elastic polishing body is not exposed. The edge portion does not bite into the elastic polishing body, and polishing can be performed without peeling off the polishing pad or damaging the lens or polishing tool to be polished. Further, since the surface area of the polishing pad is larger than the surface area of the elastic polishing body, improvement in polishing efficiency can be expected.

In the elastic polishing tool of the present invention, the diameter of the polishing pad is 1.01 to 1.30 times the arc length of the elastic polishing body.
According to this, since the diameter of the polishing pad is 1.01 to 1.30 times the arc length of the elastic polishing body, the size of the polishing pad can be optimized. When the diameter of the polishing pad is less than 1.01 times the arc length of the elastic polishing body, when the elastic polishing tool scans the entire surface to be polished, the edge portion of the polishing pad becomes the surface to be polished. Since it comes into contact and causes polishing scratches, the problem cannot be solved. Further, when the diameter of the polishing pad exceeds 1.30 times the length of the arc of the elastic polishing body, the area that does not come into contact with the surface to be polished increases, so that the polishing pad is wasted and inefficient. The diameter of the polishing pad based on this value is particularly effective when the outer shape of the object to be polished is circular.

  In the elastic polishing tool of the present invention, the diameter of the polishing pad is “(arc length of elastic polishing body + cylindrical length of elastic polishing body × 4.00) ≧ diameter of polishing pad ≧ (elasticity The arc length of the polishing body + the length of the cylindrical shape of the elastic polishing body × 0.05) ”.

  According to this, the diameter of the polishing pad is “(arc length of elastic polishing body + cylindrical length of elastic polishing body × 4.00) ≧ diameter of polishing pad ≧ (arc length of elastic polishing body) The length of the polishing pad can be reduced even when an elastic polishing body having a different cylindrical length is used. Can be optimized. When the diameter of the polishing pad is “the length of the arc of the elastic polishing body + the length of the cylindrical shape of the elastic polishing body × a value less than 0.05”, the elastic polishing tool scans the entire surface to be polished. At this time, since the edge portion of the polishing pad comes into contact with the surface to be polished and the surface is polished, the problem cannot be solved. Further, when the diameter of the polishing pad is “a value exceeding the arc length of the elastic polishing body + the length of the cylindrical shape of the elastic polishing body × 4.00”, the area not in contact with the surface to be polished increases. The polishing pad is wasted and inefficient. The diameter of the polishing pad based on this value is particularly effective when the outer shape of the object to be polished is substantially elliptical.

The elastic polishing tool of the present invention is characterized in that the diameter of the polishing pad is 1.01 times or more of the arc length of the elastic polishing body.
According to this, the diameter of the polishing pad is “(the length of the arc of the elastic polishing body + the cylindrical length of the elastic polishing body × 4.00) ≧ the diameter of the polishing pad ≧ (the length of the arc of the elastic polishing body). + The length of the cylindrical shape of the elastic polishing body × 0.05) ”and 1.01 or more times the arc length of the elastic polishing body. Can be optimized. When the diameter of the polishing pad is less than 1.01 times the arc length of the elastic polishing body, when the elastic polishing tool scans the entire surface to be polished, the edge portion of the polishing pad becomes the surface to be polished. Since it comes into contact and causes polishing scratches, the problem cannot be solved.

In the elastic polishing tool of the present invention, the material of the elastic polishing body is a thermoplastic resin.
According to this, it is possible to polish by sufficiently following the surface to be polished having a variety of curved shapes.

In the elastic polishing tool of the present invention, the material of the polishing pad is a sheet formed of a nonwoven fabric or a porous material.
According to this, even a surface to be polished having a large amount of aspheric surface can be efficiently polished to a desired optical surface.

  Further, the polishing method of the present invention includes an elastic polishing body having elasticity capable of changing a shape following the surface to be polished on the surface to be polished that rotates and swings, and the elastic polishing body. And a polishing pad having a diameter of 1.01 to 1.30 times the arc length of the elastic polishing body appearing in a cross section including the rotation axis of the elastic polishing tool, which is attached to the surface opposite to the surface to be polished The elastic polishing tool is abutted while rotating and polished.

  According to this polishing method, an elastic polishing body having elasticity capable of changing its shape following the surface to be polished, and a rotating shaft of an elastic polishing tool attached to the surface of the elastic polishing body facing the surface to be polished An elastic polishing tool having a polishing pad with a diameter of 1.01 to 1.30 times the arc length of an elastic polishing body appearing in a cross section including By abutting while rotating, the surface to be polished can be polished without causing unnecessary scratches. In this polishing method, polishing may be performed while supplying an abrasive as necessary.

  Further, the polishing method of the present invention includes an elastic polishing body having elasticity capable of changing a shape following the surface to be polished on the surface to be polished that rotates and swings, and the elastic polishing body. “(Arc length of elastic polishing body (length of arc of elastic polishing body appearing in cross section including rotation axis of elastic polishing tool) + cylindrical shape of elastic polishing body) Length × 4.00) ≧ polishing pad diameter ≧ (arc length of elastic polishing body + cylindrical length of elastic polishing body × 0.05) ” The elastic polishing tool having the above is brought into contact with rotation and polished.

  According to this polishing method, an elastic polishing body having elasticity capable of changing its shape following the surface to be polished, and an “(arc of elastic polishing body) attached to the surface of the elastic polishing body facing the surface to be polished. Length + elastic polishing body cylindrical length × 4.00) ≧ polishing pad diameter ≧ (elastic polishing body arc length + elastic polishing body cylindrical length × 0.05) ” A polishing pad having a diameter of the represented value and an abrasive polishing tool that rotates and swings against the surface to be polished while rotating, thereby preventing the polishing pad from peeling off. The lens or polishing tool to be polished is not damaged, and the surface to be polished can be polished without causing unnecessary scratches. In this polishing method, polishing may be performed while supplying an abrasive as necessary.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig.1 (a) is sectional drawing of the elastic polishing tool of this invention, The figure (b) is a top view. FIG. 2 is a schematic cross-sectional view of the elastic polishing body.

  The object to be polished suitable for the elastic polishing tool and the polishing method of the present invention is not limited as long as it is an object to be polished that requires smoothing or mirror polishing. For example, in addition to optical lenses such as eyeglass lenses, glass molds for cast polymerization of plastic lenses, optical parts such as cover glass for portable devices, and molds for forming glass molds, lens arrays, etc. can do. This embodiment exemplifies a form using a plastic spectacle lens (hereinafter referred to as a spectacle lens) as an object to be polished.

First, the elastic polishing tool 1 will be described with reference to FIGS. 1 and 2.
The elastic polishing tool 1 includes a polishing body substrate 2, an elastic polishing body 3, and a polishing pad 4. The elastic polishing body 3 is attached to the upper surface of the polishing body substrate 2, and the polishing pad 4 is further mounted on the upper surface of the elastic polishing body 3. Is attached. The elastic polishing tool 1 is mounted on a polishing shaft of a polishing apparatus and rotates to polish the aspherical shape of the spectacle lens 5 (surface 5a to be polished, see FIG. 3). The diameter of the elastic polishing tool 1 is set smaller than the diameter of the spectacle lens 5 in order to polish without breaking the aspherical shape of the spectacle lens 5.

  The abrasive base material 2 is made of a relatively hard material such as a metal or a hard plastic resin, and is formed in a cylindrical shape with a collar. The polishing body base 2 is attached to a polishing shaft of a polishing apparatus (not shown) with a collar portion centered on a cylindrical central axis, and the elastic polishing body 3 is attached to the other cylindrical surface (upper surface).

  The elastic polishing body 3 is formed of an elastic material that can change its shape following the surface to be polished 5a of the object to be polished (eyeglass lens 5), for example, silicon rubber, and has a cylindrical shape as shown in FIG. A dome-shaped curved surface having a predetermined radius of curvature R close to the polished surface shape of the object to be polished (the spectacle lens 5) is formed on one surface (namely, the surface 31 facing the surface 5a to be polished), and the other surface Is attached to the upper surface of the abrasive base 2 with an adhesive, for example, with the central axis of the cylinder aligned with the substantially central axis of the abrasive base 2. In order to perform this attachment easily, for example, the diameter D of the elastic abrasive body 3 (see FIG. 2) and the cylindrical diameter of the abrasive body base material 2 are preferably set to the same dimension. The cylindrical length (height) C of the elastic polishing body 3 is set in consideration of the outer size of the workpiece to be polished, the curved surface shape, the material of the elastic polishing body 3, and the like. Further, when polishing the object to be polished (the spectacle lens 5) by applying a polishing pressure to the elastic polishing tool 1, the length (high height) that the elastic polishing body 3 is crushed and the polishing body substrate 2 does not hit the spectacle lens 5. It is preferable to set to

  In addition to silicon rubber, the elastic abrasive 3 is made of natural rubber, nitrile rubber, chloroprene rubber, styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), rubber such as fluorine rubber, polyethylene, Mention may be made of thermoplastic resins such as nylon and thermoplastic resin elastomers such as styrene and urethane.

  The elastic polishing body 3 is prepared in many types having different curvatures of the surface 31 facing the surface to be polished 5a. When polishing the inner surface (concave surface) of the spectacle lens 5, for example, an elastic polishing body 3 having a curvature radius R (see FIG. 2) of 35 mm to 600 mm is prepared. When the radius of curvature R is in the range of 35 to 200 mm, 5 to 10 mm increments, preferably 5 to 10 types in increments of 10 to 30 mm, and several types are prepared in increments of 100 to 200 mm in the range of curvature radius R of 200 to 600 mm. Thereby, it can respond to the concave curved surface of the spectacle lens 5 based on almost all prescriptions. Further, when the outer surface (convex surface) of the spectacle lens is polished, it is possible to use a surface whose surface facing the polished surface (convex surface) of the elastic polishing body 3 is a flat surface.

  Further, the diameter D of the elastic polishing body 3 is set in a range of 20 to 60 mm because the maximum diameter of the spectacle lens 5 is generally about 80 mm when used for polishing the spectacle lens 5. When the diameter D is 20 mm or less, since the area when the elastic polishing tool 1 is pressed against the surface 5a to be polished of the spectacle lens 5 is too small, it takes time to scan the entire surface 5a (see FIG. 3). As a result, the polishing time becomes longer. Further, when the diameter D is 60 mm or more, the diameter of the spectacle lens 5 is almost equal to that of the spectacle lens 5 and it becomes difficult to polish without breaking the aspherical shape of the surface to be polished 5a.

  The polishing pad 4 is made of a circular nonwoven fabric sheet, and is attached to the position of the substantially central axis of the surface 31 of the elastic polishing body 3 facing the polished surface 5a of the elastic polishing body 3 via, for example, a double-sided adhesive tape. It is done. The size of the polishing pad 4 is one of the length of the arc AB (see FIG. 2) of the elastic polishing body appearing in the cross section including the cylindrical central axis of the elastic polishing body 3 (that is, the rotation axis of the elastic polishing tool 1). It is set to a diameter that is 0.01 to 1.30 times. The diameter of the polishing pad 4 is the length on the side of the adhesive surface that is attached to the elastic polishing body 3. Examples of the material of the polishing pad 4 include a sheet made of a porous material such as felt and polyurethane in addition to a nonwoven fabric, and a sheet made of synthetic resin in which short fibers are planted.

Next, a method for polishing the concave surface of the spectacle lens 5 using the elastic polishing tool 1 will be described.
FIG. 3 is a schematic side view showing an aspect of polishing an object to be polished using the elastic polishing tool of the present invention.

In FIG. 3, the elastic polishing tool 1 (the flange portion of the polishing body substrate 2) is mounted on a polishing shaft of a polishing apparatus (not shown). The elastic polishing tool 1 mounted on the polishing shaft has an average radius of curvature of the surface 5a to be polished of the spectacle lens 5 from the curvature of the surface 31 facing the surface 5a to be polished of the elastic polishing body 3 prepared in various types. A material having a smaller radius of curvature and closest to the radius of curvature of the surface to be polished 5a is selected.
The polishing shaft of the polishing apparatus includes a mechanism that presses the elastic polishing tool 1 against the surface to be polished 5a of the spectacle lens 5 with a predetermined polishing pressure by applying, for example, air pressure. The polishing apparatus also includes a discharge nozzle 8 that supplies a slurry 9 containing an abrasive between the elastic polishing tool 1 and the polished surface 5 a of the spectacle lens 5.

  On the other hand, a spectacle lens 5 as an object to be polished is connected to a bonding material 6 made of, for example, a low melting point metal or wax, which is bonded to a mounting jig 7 that is fixed to a chuck of a polishing apparatus (not shown). The surface (convex surface) opposite to the surface 5 a to be polished of the lens 5 is pasted and fixed with the approximate center of the lens as the approximate center axis position of the bonding material 6. Note that the chuck of the polishing apparatus includes a rotation (rotation) mechanism and a swing mechanism by numerical control or the like.

  In the polishing method of the surface 5a to be polished of the spectacle lens 5, first, the polishing shaft of the polishing apparatus is rotationally driven to rotate the elastic polishing tool 1 mounted on the polishing shaft. Then, air pressure is applied to the mechanism that presses the polishing shaft against the surface to be polished 5a, and the elastic polishing tool 1 is pressed against the surface to be polished 5a of the spectacle lens 5 with a predetermined pressure, and the chuck is rotated by the rotation mechanism with a predetermined rotation. While rotating (rotating) by number, the swing mechanism operates to swing on the elastic polishing tool 1.

Along with the rotation of the chuck and the polishing shaft, a slurry 9 containing an abrasive is supplied from the discharge nozzle 8 between the elastic polishing tool 1 and the surface to be polished 5a, and the surface to be polished 5a of the spectacle lens 5 is polished.
Note that the rotation direction of the polishing shaft (elastic polishing tool 1) and the rotation direction of the chuck (glass lens 5) of the polishing apparatus may be either the same rotation direction or the opposite rotation direction, but they are opposite from the viewpoint of polishing efficiency. The direction of rotation is more preferred.

  For example, 0.01 to 1.00 MPa is applied as the air pressure at which the elastic polishing tool 1 is pressed against the surface 5a to be polished of the spectacle lens 5 by a mechanism for pressing. Moreover, the rotation speed of the elastic polishing tool 1 (polishing shaft) is set in a range of 100 to 1500 rpm, for example, and the rotation speed of the spectacle lens 5 (chuck) is set in a range of 100 to 1500 rpm, for example. Polishing is performed by setting the rocking speed of the eyeglass lens 5 (chuck) to, for example, 1 to 20 reciprocations / min.

  According to this polishing method, the elastic polishing tool 1 (the elastic polishing body 3 and the elastic polishing body 3) has a radius of curvature smaller than the diameter of the spectacle lens 5 and smaller than the average radius of curvature of the surface 5 a to be polished of the spectacle lens 5. By selecting the polishing pad 4) closest to the radius of curvature of the surface 5a to be polished, and performing polishing with almost the entire surface of the elastic polishing tool 1 in contact with the surface 5a to be polished, the spectacle lens 5 Since the entire surface of the elastic polishing tool 1 is always in pressure contact with the surface to be polished 5a due to the rocking motion, polishing irregularities occur without breaking the predetermined aspherical shape formed in advance by cutting. Difficult mirror polishing can be performed.

  Further, the polishing pad 4 attached to the surface 31 of the elastic polishing body 3 facing the surface to be polished 5a has a length of the arc AB of the elastic polishing body that appears in a cross section including the cylindrical central axis of the elastic polishing body 3. By setting the diameter to be 1.01 to 1.30 times, when the elastic polishing tool 1 is scanned over the entire surface to be polished 5a of the spectacle lens 5, the edge portion of the elastic polishing tool 1 on the surface to be polished 5a. Can contact the surface to be polished 5a, and the surface to be polished 5a can be polished efficiently without causing unnecessary scratches.

Next, polishing of a spectacle lens whose outer shape is substantially elliptical and has a sharp peripheral edge will be described. The substantially elliptical shape is a non-circular shape including at least an arc in the outline of the outer peripheral portion, and examples thereof include an oval shape and a track shape.
FIG. 4A is a top view showing an example of a spectacle lens having an approximately elliptical outer shape, and FIG. 4B is a cross-sectional view of the spectacle lens shown in FIG.

  In FIG. 4, a spectacle lens 50 is calculated by using a computer or the like from the spectacle frame data and the lens prescription so that the lens center thickness is calculated so as to obtain the thinnest center thickness, and the lens base having a circular outer shape is used. The external shape of the spectacle lens after 51 to-be-polished surface 5a is grind | polished is shown. The outer shape of the polished spectacle lens 50 is an oval substantially elliptical shape with the outermost diameter d and the shortest diameter f centered on the lens center O3, and the periphery of the lens is sharply polished. The spectacle lens 50 polished to obtain predetermined optical characteristics is then subjected to a surface treatment or the like to make the lens difficult to be scratched, and is subjected to edging according to the shape of the inner peripheral edge of the spectacle frame. The target lens processing is performed.

  An elastic polishing tool 1 in the case of polishing a spectacle lens 50 having a substantially oval lens outer shape and a sharp lens periphery is a polishing pad that is attached to a surface 31 of the elastic polishing body 3 that faces the surface to be polished 5a. 4 is “(length of arc AB of elastic polishing body 3 appearing in cross section including cylindrical central axis O of elastic polishing body 3 + cylinder length C × 4.00 of elastic polishing body 3)” ≧ diameter D of polishing pad 3 ≧ (length of arc AB of elastic polishing body 3 + cylindrical length C × 0.05 of elastic polishing body 3) ”(see FIG. 2) ). Further, the diameter of the polishing pad 4 is set to a value of 1.01 times or more the length of the arc AB of the elastic polishing body 3 appearing in the cross section including the cylindrical central axis of the elastic polishing body 3 (see FIG. 2). ).

  The cylindrical length (height) C of the elastic polishing body 3 is set to a predetermined value in consideration of the outer size of the spectacle lens 50 to be polished, the curved surface shape, the material of the elastic polishing body 3, and the like. When polishing the spectacle lens 50 by applying a polishing pressure to the elastic polishing tool 1 (see FIG. 3), the elastic polishing body 3 is crushed by the polishing pressure, and the polishing body substrate 2 to which the elastic polishing body 3 is attached is applied. It is preferable to set the length (height) that the spectacle lens 50 does not hit.

  Further, when the diameter of the polishing pad 4 is less than 1.01 times the arc length of the elastic polishing body 3, when the elastic polishing tool 1 scans the entire surface to be polished 5 a, The edge portion comes into contact with the surface to be polished 5a, and polishing scratches are generated on the surface to be polished 5a. The ratio of the diameter of the polishing pad 4 to the length of the arc AB of the elastic polishing body 3 varies depending on the cylindrical length C of the elastic polishing body 3 used, and may be a large ratio value.

  The elastic polishing tool 1 is mounted on the polishing shaft of the polishing apparatus, rotated at a predetermined rotational speed, and abutted against the surface to be polished 5a of the spectacle lens 50 with a predetermined pressure. On the other hand, a spectacle lens 50 as an object to be polished is mounted on a chuck of a polishing apparatus, and swings while rotating (rotating) at a predetermined rotation speed, thereby polishing the surface 5a to be polished of the spectacle lens 50 ( (See FIG. 3).

  In the spectacle lens 50 to be polished, when the diameter D of the polishing pad 4 is set to the above-described value, the polishing pad 4 is attached to the entire surface including the edge portion of the elastic polishing body 3 and elastic polishing is performed. Since the body 3 is not exposed, the edge of the outer shape of the spectacle lens 50 is removed by biting into the polishing pad 4, or the spectacle lens 50 to be polished and the elastic polishing tool 1 can be polished without damage. it can. When the elastic polishing tool 1 is brought into contact with the surface to be polished 5a with a predetermined pressure to polish the spectacle lens 50, the elastic polishing body 3 is crushed so that the edge portion of the polishing body base 2 is brought into contact with the surface to be polished 5a. It does not contact the surface 5a to be polished and cause unnecessary scratches.

  Even when the outer shape of the lens is circular, the diameter of the polishing pad 4 is “(the length of the arc AB of the elastic polishing body 3 appearing in the cross section including the cylindrical central axis O of the elastic polishing body 3+ The cylindrical length C × 4.00 of the elastic polishing body 3 ≧ the diameter D of the polishing pad 3 ≧ (the length of the arc AB of the elastic polishing body 3 + the cylindrical length C × 0.00 of the elastic polishing body 3). 05) "is set to a value represented by" 05) ", the same effect as the case where the outer shape is substantially elliptical can be obtained. At this time, the diameter of the polishing pad 4 is desirably a value in the range of 1.01 to 1.30 times the arc length of the elastic polishing body 3 appearing in the cross section including the rotation axis of the elastic polishing tool 1.

  In the embodiment described above, the elastic polishing tool 1 having a dome-shaped curved surface is used to polish the concave surface of the spectacle lenses 5 and 50 as the surface to be polished 5a. The present invention can also be applied to the case where an object to be polished having a convex surface as the surface 5a to be polished is polished using the elastic polishing tool 1 having a curved surface.

  Examples and comparative examples based on this embodiment will be described below.

Example 1
As an object to be polished, the spectacle lens 5 having a circular outer shape of 75 mm in diameter and an average curvature radius of the surface to be polished 5a of 120 mm was polished.
An elastic polishing body 3 having a diameter D of 40 mm and a curvature radius R of 100 mm was selected as the elastic polishing tool 1. At this time, the length of the arc AB of the elastic polishing body 3 is 40.27 mm, and the circular polishing pad 4 having a diameter of 42.0 mm, in which the outer diameter of the elastic polishing body 3 is 1.73 mm larger than the length of the arc AB, The center of the elastic polishing body 3 and the center axis of the polishing pad 4 were made to substantially coincide with each other and attached to the surface 31 of the elastic polishing body 3 facing the surface to be polished 5a. That is, this example uses the polishing pad 4 having a diameter that is 1.04 times the length of the arc AB of the elastic polishing body 3.
The pressure applied to the elastic polishing tool 1 is set to 0.1 MPa, the number of rotations is set to 1400 rpm, the number of rotations of the spectacle lens 5 is set to 500 rpm, and the surface to be polished 5a is oscillated at a rate of one reciprocation in 10 seconds. Polishing was performed. The spectacle lens 5 having the polished surface 5a polished was used as a sample 1.

(Example 2)
The polishing pad 4 to be attached to the surface 31 of the elastic polishing body 3 facing the surface to be polished 5a has a diameter of 41.0 mm, which is 0.73 mm larger than the length of the arc AB of the elastic polishing body 3, and similarly a diameter 44. Polishing was performed under the same polishing conditions as in Example 1 except that four types of circular polishing pads of 0 mm, 7.73 mm in diameter 48.0 mm, and 11.73 mm in diameter 52.0 mm were used. That is, in this example, the polishing pad 4 having diameters 1.02, 1.09, 1.19, and 1.29 times the length of the arc AB of the elastic polishing body 3 is used. The spectacle lens 5 with the polished surface 5a polished was used as samples 2, 3, 4, and 5 in order of decreasing diameter of the polishing pad 4 used for polishing.

(Example 3)
As the polishing pad 4, a circular polishing pad 4 a having a diameter of 44.0 mm whose outer diameter is 3.73 mm larger than the length of the arc AB of the elastic polishing body 3 is used. As shown in the top view of the elastic polishing tool in FIG. The center axis O1 of the polishing body 3 and the center O2 of the polishing pad 4a are decentered, and the entire surface 31 of the elastic polishing body 3 facing the surface to be polished 5a is attached so as to be covered with the polishing pad 4a. An elastic polishing tool 1a was constructed. That is, in this example, the polishing pad 4a having a diameter that is 1.09 times the length of the arc AB of the elastic polishing body 3 is used. Polishing was performed under the same polishing conditions as in Example 1 except that the elastic polishing tool 1a was used. A spectacle lens 5 having a polished surface 5 a polished was used as a sample 6.

Example 4
As the polishing pad 4, as shown in the top view of the elastic polishing tool 1 b in FIG. 6, a petal-shaped polishing pad in which a circular pad is provided with a large number (in the example, five) notches 41. 4b is attached so that the center axis of the elastic polishing body 3 is substantially coincident with the center of the polishing pad 4b so as to cover the surface 31 of the elastic polishing body 3 facing the surface to be polished 5a. Configured. The petal-shaped polishing pad 4b conforms to the shape of the surface 31 facing the surface to be polished 5a of the elastic polishing body 3, and is attached to the surface 31 facing the surface to be polished 5a when the radial notch 41 is formed. However, it functions as a passage for supplying the slurry 9 and discharging polishing waste. The outer diameter of the polishing pad 4b was 44.0 mm, which is 3.73 mm larger than the length of the arc AB of the elastic polishing body 3. That is, in this example, the polishing pad 4b having a diameter that is 1.09 times the length of the arc AB of the elastic polishing body 3 is used. Polishing was performed under the same polishing conditions as in Example 1 except that the petal-shaped polishing pad 4b was used for the elastic polishing tool 1b. The spectacle lens 5 having the polished surface 5a polished was used as a sample 7.

(Example 5)
As shown in the top view of the elastic polishing tool 1c in FIG. 7, the polishing pad 4 is composed of a large number of polygonal pads 42 (regular hexagons in the embodiment), and the sides of the polygonal pads 42 are connected to each other. The polishing pad 4c is formed by being attached so as to cover the surface 31 of the elastic polishing body 3 facing the surface 5a to be polished. The gap between the pads 42 is a water passage groove 43 where the surface 31 of the elastic polishing body 3 facing the surface to be polished 5a is exposed, and functions as a passage for supplying the slurry 9 and discharging polishing waste. The outermost diameter position of the large number of pads 42 from the central axis of the elastic polishing body 3 is the outer shape of the polishing pad 4c, and the diameter is 48.0 mm. That is, in this example, the polishing pad 4c having a diameter that is 1.19 times the length of the arc AB of the elastic polishing body 3 is used. Polishing was performed under the same polishing conditions as in Example 1 except that the elastic polishing tool 1c was configured using the polishing pad 4c. The spectacle lens 5 having the polished surface 5a polished was used as a sample 8.

(Comparative Example 1)
As the polishing pad 4, a circular polishing pad 4 having a diameter of 40.0 mm, which is 0.27 mm smaller than the length of the arc AB of the elastic polishing body 3, is made elastic with the central axis of the elastic polishing body 3 and the center of the polishing pad 4 approximately aligned. The elastic polishing tool 1 was configured by being attached to the surface 31 of the polishing body 3 facing the surface to be polished 5a. That is, in this example, the polishing pad 4 having a diameter that is 0.99 times the length of the arc AB of the elastic polishing body 3 is used. Polishing was performed under the same polishing conditions as in Example 1 except for the polishing pad 4. The spectacle lens 5 having the polished surface 5a polished was used as a sample 9.

  The appearance quality (presence or absence of scratches) of the polished surface 5a of the spectacle lens 5 obtained from Examples 1 to 5 (Samples 1 to 8) and Comparative Example 1 (Sample 9) was visually confirmed. The results are shown in Table 1 together with the shape specifications of the polishing pad 4 used for polishing. In addition, the quality of the appearance quality was judged by ○ and ×.

表１より、研磨パッド４の形状に係わらず、研磨パッド４の直径が弾性研磨体３の回転軸を含む断面に現れる弾性研磨体の弧ＡＢの長さよりも０．７３〜１１．７３ｍｍ大きな直径の範囲において、被研磨面５ａの全面が、研磨残り、研磨キズ等の発生のない鏡面研磨がされ、眼鏡レンズとしての所望の外観品質が得られる（実施例１〜８）。また、研磨パッド４の直径が弾性研磨体３の回転軸を含む断面に現れる弾性研磨体の弧ＡＢの長さに対して小さな場合において、研磨残りはなかったが、眼鏡レンズとして許容できない円弧状の研磨キズが多数発生し、眼鏡レンズとしての所望の外観品質を得ることができない（比較例１）。

From Table 1, regardless of the shape of the polishing pad 4, the diameter of the polishing pad 4 is 0.73 to 11.73 mm larger than the length of the arc AB of the elastic polishing body appearing in the cross section including the rotation axis of the elastic polishing body 3. In this range, the entire surface 5a to be polished is mirror-polished with no polishing residue and no scratches on the surface to be polished, and a desired appearance quality as a spectacle lens can be obtained (Examples 1 to 8). Further, in the case where the diameter of the polishing pad 4 is smaller than the length of the arc AB of the elastic polishing body appearing in the cross section including the rotation axis of the elastic polishing body 3, there is no polishing residue, but an arc shape that is not acceptable as a spectacle lens. Thus, a desired appearance quality as a spectacle lens cannot be obtained (Comparative Example 1).

  Therefore, the outer diameter of the polishing pad 4 is in a range larger than the length of the arc AB of the elastic polishing body appearing in the cross section including the rotation axis of the elastic polishing body 3, preferably in the range of a diameter larger by 0.5 to 12 mm, that is, polishing. In the range where the diameter of the pad 4 is 1.02 to 1.30 times the length of the arc AB of the elastic polishing body 3, it is possible to polish the surface 5a of the spectacle lens 5 without unnecessary scratches. An elastic polishing tool and a polishing method using the same are obtained.

  Next, an example and a comparative example in a spectacle lens in which the contour (outer shape) of the outer peripheral part of the lens is substantially elliptical and the lens peripheral part is sharp will be described. In addition, the sample in the case where the outer shape of the lens is circular was also created and verified (Example 9 and Comparative Example 4).

(Example 6)
As an object to be polished, a lens (glass eyeglass lens 50) having an outer shape of a lens having a substantially elliptical shape and a sharp peripheral edge having an average curvature radius of 120 mm of the surface to be polished 5a was polished. The length from the lens center O3 of the spectacle lens 50 after polishing to the lens outer peripheral portion was a maximum of 40 mm (that is, the outermost diameter d was 80 mm) and a minimum length of 35 mm (that is, the shortest diameter f was 70 mm).

  As the elastic polishing tool 1, an elastic polishing body 3 having a diameter D of 40 mm, a radius of curvature R of 100 mm, and a cylindrical length C of 6.00 mm was used. At this time, the length of the arc AB of the elastic polishing body 3 is 40.27 mm, and the circular polishing pad 4 having a diameter of 64.27 mm, whose outer diameter is 24.00 mm larger than the length of the arc AB, The center of the elastic polishing body 3 and the center axis of the polishing pad 4 were made to substantially coincide with each other and attached to the surface 31 of the elastic polishing body 3 facing the surface to be polished 5a. That is, the diameter of the polishing pad 4 in this example is a value obtained by adding the length of the arc C of the elastic polishing body 3 to the length of the cylindrical shape C of the elastic polishing body 3 × 4.00 times. The diameter of the polishing pad 4 is 1.60 times the length of the arc AB of the elastic polishing body 3.

  The pressure applied to the elastic polishing tool 1 (polishing shaft) is set to 0.08 MPa, the rotational speed is set to 1400 rpm, the rotational speed of the spectacle lens 50 (chuck) is set to 500 rpm, and the surface to be polished 5a is shaken at a rate of one reciprocation in 10 seconds. Polishing was performed for 2 minutes. The eyeglass lens 50 having the polished surface 5a polished was used as a sample 10.

(Example 7)
Except that the polishing pad 4 to be attached to the surface 31 of the elastic polishing body 3 facing the surface 5a to be polished is a polishing pad 4 having a diameter of 40.57 mm which is 0.30 mm larger than the length of the arc AB of the elastic polishing body 3, Polishing was performed under the same object to be polished as in Example 6 and polishing conditions. In other words, the diameter of the polishing pad 4 in this example is a value obtained by adding 0.05 times the length of the cylindrical shape C of the elastic polishing body 3 to the length of the arc AB of the elastic polishing body 3. The diameter of the polishing pad 4 is 1.01 times the length of the arc AB of the elastic polishing body 3. The spectacle lens 50 having the polished surface 5a polished was used as a sample 11.

(Example 8)
As the polishing pad 4 to be attached to the surface 31 of the elastic polishing body 3 facing the surface 5a to be polished, the polishing pad 4 having a diameter of 60.27 mm which is 20.00 mm larger than the length of the arc AB of the elastic polishing body 3 is used. Polishing was performed under the same conditions as in Example 6 and under the same polishing conditions except that the elastic polishing body 3 having a cylindrical length C of 10.00 mm was used as 3. That is, the diameter of the polishing pad 4 of this example is a value obtained by adding a length of 2.00 times the length of the cylindrical shape C of the elastic polishing body 3 to the length of the arc AB of the elastic polishing body 3. The diameter of the polishing pad 4 is 1.50 times the length of the arc AB of the elastic polishing body 3. The spectacle lens 50 having the polished surface 5a polished was used as a sample 12.

Example 9
As an object to be polished, a spectacle lens 5 having a circular outer shape and an average curvature radius of the surface to be polished 5a of 120 mm was polished. The length from the center of the spectacle lens 5 to the outer periphery of the lens was 40 mm (that is, the outer diameter was 80 mm).

  As the elastic polishing tool 1, an elastic polishing body 3 having a diameter D of 40 mm, a radius of curvature R of 100 mm, and a cylindrical length C of 6.00 mm was used. At this time, the length of the arc AB of the elastic polishing body 3 is 40.27 mm, and the circular polishing pad 4 having a diameter of 40.57 mm, the outer diameter of the elastic polishing body 3 being 0.30 mm larger than the length of the arc AB, The center of the elastic polishing body 3 and the center axis of the polishing pad 4 were made to substantially coincide with each other and attached to the surface 31 of the elastic polishing body 3 facing the surface to be polished 5a. That is, the diameter of the polishing pad 4 in this example is a value obtained by adding the length of the arc C of the elastic polishing body 3 to the length of the cylindrical shape C of the elastic polishing body 3 times 0.05 times. The diameter of the polishing pad 4 is 1.01 times the length of the arc AB of the elastic polishing body 3. Polishing was performed under the same conditions as in Example 1. The spectacle lens 5 having the polished surface 5 a polished was used as a sample 13.

(Comparative Example 2)
The polishing object was the same as in Example 6 except that a circular polishing pad 4 having a diameter of 40.51 mm, which was 0.24 mm larger than the length of the arc AB of the elastic polishing body 3, and the polishing conditions were used. Polishing was performed. That is, the diameter of the polishing pad 4 of this example is a value obtained by adding 0.04 times the length of the cylindrical shape C to the length of the arc AB of the elastic polishing body 3. The diameter of the polishing pad 4 is 1.01 times the length of the arc AB of the elastic polishing body 3. The spectacle lens 50 having the polished surface 5a polished was used as a sample 14.

(Comparative Example 3)
The polishing object was the same as in Example 6, except that a circular polishing pad 4 having a diameter of 0.467 mm larger than the length of the arc AB of the elastic polishing body 3 and having a diameter of 40.67 mm was used. Polishing was performed. That is, the diameter of the polishing pad 4 of this example is a value obtained by adding 0.04 times the length of the cylindrical shape C to the length of the arc AB of the elastic polishing body 3. The diameter of the polishing pad 4 is 1.00 times the length of the arc AB of the elastic polishing body 3. The spectacle lens 50 having the polished surface 5a polished was used as a sample 15.

(Comparative Example 4)
Polishing is performed under the same conditions as in Example 9, except that a circular polishing pad 4 having a diameter of 40.51 mm, which is 0.24 mm larger than the length of the arc AB of the elastic polishing body 3, is used as the polishing pad 4. Went. That is, the diameter of the polishing pad 4 of this example is a value obtained by adding 0.04 times the length of the cylindrical shape C to the length of the arc AB of the elastic polishing body 3. The diameter of the polishing pad 4 is 1.00 times the length of the arc AB of the elastic polishing body 3. The spectacle lens 5 having the polished surface 5 a polished was used as a sample 16.

  The appearance quality (presence or absence of scratches) of the polished surface 5a of each spectacle lens obtained from Examples 6 to 9 (Samples 10 to 13) and Comparative Examples 2 to 4 (Samples 14 to 16) was visually observed. confirmed. The results are shown in Table 2 together with the shape specifications of the polishing pad 4 used for polishing. In addition, the quality of the appearance quality was judged by ○ and ×.

表２より、外周部の輪郭（外形形状）が略楕円形で、縁部が鋭利な眼鏡レンズ５０の被研磨面５ａを研磨する際、研磨パッド４の直径が、弾性研磨体３の回転軸を含む断面に現れる弾性研磨体の弧ＡＢの長さに、円筒形Ｃの長さの０．０５〜４．００倍の長さを加えた値であると共に、弾性研磨体３の弧ＡＢの長さの１．０１倍以上の値の研磨パッドを用いた場合には、被研磨面５ａの全面が、研磨残り、研磨キズ等の発生のない鏡面研磨がされ、所定の外観品質の眼鏡レンズが得られる（実施例６〜８）。

From Table 2, when polishing the polished surface 5a of the spectacle lens 50 whose outer periphery has a substantially elliptical outline (outer shape) and a sharp edge, the diameter of the polishing pad 4 is the rotational axis of the elastic polishing body 3. Is a value obtained by adding 0.05 to 4.00 times the length of the cylindrical shape C to the length of the arc AB of the elastic abrasive body appearing in the cross section including the When a polishing pad having a value of 1.01 or more times the length is used, the entire polished surface 5a is mirror-polished without generation of polishing scratches and the like, and a spectacle lens having a predetermined appearance quality. Are obtained (Examples 6 to 8).

  On the other hand, the diameter of the polishing pad 4 is a value obtained by adding 0.04 times the length of the cylindrical C to the length of the arc AB of the elastic polishing body appearing in the cross section including the rotation axis of the elastic polishing body 3. When the polishing pad 4 having a diameter of is used, the occurrence of arc-shaped polishing scratches that are unacceptable as a spectacle lens is observed on the surface to be polished 5a (Comparative Example 2). Alternatively, the sharp lens peripheral edge bites into the elastic polishing body 3, and the spectacle lens 50 and the elastic polishing body 3 are damaged, so that the desired appearance quality cannot be obtained (Comparative Example 3). In particular, in Comparative Example 2, a spectacle lens having a desired appearance quality cannot be obtained even though the diameter of the polishing pad 4 is 1.01 times or more the length of the arc AB of the elastic polishing body 3.

  Further, when polishing the polished surface 5 a of the spectacle lens 5 having a circular outer shape, the diameter of the polishing pad 4 is set to the length of the arc AB of the elastic polishing body 3 that appears in the cross section including the rotation axis of the elastic polishing body 3. When the polishing pad 4 having a value obtained by adding 0.05 times the length of the cylindrical shape C or 1.01 times or more the length of the arc AB of the elastic polishing body 3 is used, The entire surface to be polished 5a is mirror-polished to obtain a spectacle lens having an appearance quality free from any polishing residue or polishing scratches (Example 9).

  Further, when polishing the polished surface 5 a of the spectacle lens 5 having a circular outer shape, the diameter of the polishing pad 4 is set to the length of the arc AB of the elastic polishing body 3 that appears in the cross section including the rotation axis of the elastic polishing body 3. When the polishing pad 4 having a value obtained by adding 0.04 times the length of the cylindrical shape C or 1.00 times the length of the arc AB of the elastic polishing body 3 is used, The occurrence of arc-shaped polishing scratches that are unacceptable as spectacle lenses is observed on the polishing surface 5a (Comparative Example 4).

  Therefore, the diameter of the polishing pad 4 is 0.05 to 4.00 times as long as the length of the cylindrical C in the length of the arc AB of the elastic polishing body 3 appearing in the cross section including the rotation axis of the elastic polishing body 3. By adding the value to the diameter, it is possible to prevent the generation of unnecessary scratches on the polished surface 5a of the spectacle lens 50 and to be able to polish without damaging the spectacle lens 50 and the elastic polishing body 3. A polishing tool 1 and a polishing method using the same are obtained. The same effect can be obtained when the diameter of the polishing pad 4 is 1.01 times or more the length of the arc AB of the elastic polishing body 3.

(A) is sectional drawing of the elastic polishing tool of this invention. (B) is a top view of the elastic polishing tool of the present invention. The schematic cross section of an elastic polishing body. The schematic side view which shows the aspect which grind | polishes a to-be-polished object using the elastic polishing tool of this invention. (A) is a top view showing an example of a spectacle lens whose outer shape is substantially elliptical. (B) is sectional drawing of the spectacle lens shown to (a). FIG. 6 is a top view of an elastic polishing tool shown in Example 3. FIG. 6 is a top view of an elastic polishing tool shown in Example 4. FIG. 6 is a top view of an elastic polishing tool shown in Example 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1a, 1b, 1c ... Elastic polishing tool, 2 ... Polishing body base material, 3 ... Elastic polishing body, 31 ... The surface facing the to-be-polished surface 5a of the elastic polishing body 3, 4, 4a, 4b, 4c ... Polishing Pad, 41 ... Notch, 42 ... Pad, 43 ... Water groove, 5, 50 ... Eyeglass lens as object to be polished, 5a ... Surface to be polished, 6 ... Bonding agent, 7 ... Mounting jig, 8 ... Discharge Nozzle, 9 ... Slurry, AB ... Arc of elastic polishing body 3 appearing in cross section including rotation axis of elastic polishing tool 1, C ... Cylindrical length of elastic polishing body 3, D ... Diameter of elastic polishing body 3, R ... the radius of curvature of the surface 31 of the elastic polishing body 3 facing the surface 5a to be polished.

Claims (7)

In an elastic polishing tool used for polishing while rotating against a surface to be polished,
An elastic polishing body having elasticity capable of changing its shape following the surface to be polished, and a polishing pad attached to a surface of the elastic polishing body facing the surface to be polished;
The elastic polishing tool, wherein the polishing pad has a diameter larger than an arc length of the elastic polishing body that appears in a cross section including a rotation axis of the elastic polishing tool. The elastic polishing tool according to claim 1,
An elastic polishing tool, wherein a diameter of the polishing pad is 1.01 to 1.30 times an arc length of the elastic polishing body. The elastic polishing tool according to claim 1,
The diameter of the polishing pad is
“(Length of arc of elastic polishing body + cylindrical length of elastic polishing body × 4.00) ≧ diameter of polishing pad ≧ (arc length of elastic polishing body + cylindrical length of elastic polishing body) × 0.05) ",
An elastic polishing tool having a value represented by The elastic polishing tool according to claim 3, wherein
An elastic polishing tool, wherein a diameter of the polishing pad is 1.01 times or more of an arc length of the elastic polishing body. In the elastic polishing tool according to any one of claims 1 to 4,
An elastic polishing tool, wherein a material of the elastic polishing body is a thermoplastic resin. In the elastic polishing tool according to any one of claims 1 to 5,
An elastic polishing tool, wherein the polishing pad is made of a nonwoven fabric or a porous material. On the surface to be polished of the object to be rotated and swinging,
Abutting while rotating the elastic polishing tool according to any one of claims 1 to 6,
A polishing method comprising polishing a surface to be polished of the object to be polished.

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