JP4186809B2 - Optical lens polishing method - Google Patents

Description

  The present invention relates to a polishing jig, a polishing apparatus, and a polishing method.

  Conventionally, as shown in Patent Document 1, the polishing of spectacle lenses is performed on a block jig for chucking a lens before polishing processing called a semi-finished lens, which is thicker than the finished dimension, to a processing machine. After fixing the semi-finished lens fixed to this block jig with a low melting point alloy, wax, etc. to rough the desired shape according to the wearer's spectacle prescription, sand similar to lapping processing A hanging process and a polishing process have been performed, and the optical surface of the lens has been precisely finished. In the sanding process and the polishing process, as shown in FIG. 9A, a rigid polishing tool 52 having a convex surface having the same shape as the concave surface 331 of the lens base material 33 is used as a liquid or a polishing containing water as a main component. The concave surface 331 of the lens base material 33 is finished to be a mirror surface by sliding with the agent interposed.

  Further, in recent years, the surface shape such as an axisymmetric aspherical surface, an aspherical astigmatic surface, a progressive surface, and a surface obtained by combining a toric surface and a progressive surface on the eyeball side surface of the spectacle lens according to the spectacle prescription of the wearer. High value-added lenses are also being produced. These so-called free-form surfaces cannot be continuously rubbed with the rigid polishing tool 52 having a convex surface having the same shape as the concave surface of the lens. For this reason, as shown in FIG. 9B, mirror finish is achieved by sliding the concave surface 331 of the lens base material 33 and the polishing tool 22 provided with an elastic sheet (elastic body) while interposing an abrasive. Is going. Since the elastic sheet of the polishing tool 22 is an elastic body, it can be rubbed while deforming following the shape of the concave surface 331 of the lens base material 33, and polishing of a free-form surface can be performed. Examples of a method for performing polishing according to such a workpiece shape include Patent Document 2 and Patent Document 3.

JP 47-14776 A JP-A-8-206952 JP 2003-275949 A

  However, in the case of polishing with a free-form surface, the force distribution is non-uniform because the elastic sheet of the polishing tool is deformed and slid along the shape of the concave lens surface. At this time, particularly in a lens having a polished surface represented by a prism spectacle prescription lens and a progressive power lens having different lens thicknesses on the far side and the near side, as shown in FIG. 9C. In addition, a portion 331A in which the abrasive tool hits the elastic sheet and a portion 331B in which the hit is weak or the abrasive tool does not hit the elastic sheet are generated. When polishing is performed in accordance with the portion 331A having a strong hit, the portion 331B having a weak hit is not sufficiently polished. Further, when polishing is performed in accordance with the weakly hitting portion 331B, it takes a long time to obtain a finished surface, and the polishing of the stronger hitting portion 331A proceeds excessively, and the shape change called sagging increases. Had a problem.

  In addition, since the contact between the elastic sheet of the polishing tool and the lens to be processed is non-uniform, excessive force is applied to each other by rubbing, and the lens to be processed is detached from the polishing apparatus, or the lens to be processed itself is damaged, or the polishing tool Has a problem that the tool life is shortened due to damage.

  These problems are not limited to spectacle lenses, and may occur in all optical lenses when polishing by sliding with a polishing tool.

  The present invention has been made in view of the above circumstances, and provides a polishing jig and a polishing apparatus capable of making the contact surface of the lens to be processed (optical lens) and the polishing tool substantially uniform, and this polishing. An object of the present invention is to provide a polishing method that uses a jig to shorten the polishing time, reduce damage to the lens to be processed, and improve the life of the polishing tool.

  As a result of intensive studies to achieve the above object, the present inventor has found that the polished surface of the optical lens and the thickness of the optical lens are in contact with each other in order to bring the polished surface of the optical lens into contact with the polishing tool almost uniformly. It is effective to incline the optical lens so that the difference is corrected. To that end, the block jig to which the optical lens is fixed is tilted and fixed at a predetermined angle, and is attached to the polishing apparatus in that state. It has been found that it is effective to use a polishing jig.

The polishing jig of the present invention is a polishing apparatus for polishing a polishing tool having a dome-shaped elastic body while pressing the elastic body against a surface to be polished of an optical lens while applying tension to the elastic body with a pressure fluid. A polishing jig for fixing a block jig to which an optical lens is fixed to the apparatus main body, comprising: a fixing part for fixing the block jig; and a mounting part to be attached to a chuck of the polishing apparatus, It is characterized in that a surface defining the inclination of the block jig in the fixing portion and a surface defining the inclination by the chuck in the mounting portion are formed at a predetermined angle.
According to the present invention, the polishing jig includes a fixing portion for fixing the block jig to which the optical lens is fixed, and a mounting portion for mounting the polishing jig on the chuck of the polishing apparatus. A surface defining the inclination (hereinafter referred to as a fixed surface) and a surface defining the inclination of the mounting portion (hereinafter referred to as a mounting surface) have a predetermined angle. When fixing the block jig to which the optical lens is fixed to the polishing jig, if the inclination of the fixed surface of the polishing jig and the polishing surface of the optical lens are offset in a mutually canceling manner, the polished surface will hit the polishing tool. As a result, the entire surface to be polished can be polished more uniformly. Thereby, it is possible to prevent the occurrence of shape change called sagging and the occurrence of polishing residue. Furthermore, since it can grind | polish uniformly, the time until the whole to-be-polished surface is finished in the desired surface is also shortened.
In addition, since the surface to be polished of the optical lens and the polishing tool come into contact with each other without difficulty, the problem that the optical lens is detached from the polishing apparatus and damaged, or the polishing tool is damaged and the tool life is shortened is improved.
Further, if the shape of the mounting portion of the polishing jig is the same as the shape of the block jig, the polishing treatment according to the present invention can be performed without changing the structure of the polishing apparatus body to which the block jig has been directly mounted. A tool can be attached, and the contact between the optical lens and the polishing tool can be made almost uniform. Therefore, for an optical lens with a small inclination of the surface to be polished and a small difference in thickness, the polishing jig according to the present invention is not used, and the block jig to which the optical lens is fixed may be directly attached to the polishing apparatus. Processing is possible with a common polishing apparatus.

At this time, an angle formed between a surface defining the inclination of the block jig in the fixed portion and a surface in which the inclination is regulated by the chuck in the mounting portion is at least the prism amount of the optical lens, the addition power, and the angle of the astigmatism axis. It is preferable to be determined based on any one of the above.
According to the present invention, based on any one of the prism amount of the optical lens, the addition power, and the angle of the astigmatism axis, the surface defining the inclination of the block jig in the fixed portion and the chuck in the mounting portion Since the angle formed by the surface where the inclination is restricted is set, the angle formed between the surface defining the inclination of the block jig in the fixed portion and the surface where the inclination is restricted by the chuck in the mounting portion is the optical lens. This corresponds to the inclination of the surface to be polished. Thereby, the to-be-polished surface of an optical lens can be more accurately ground.

The polishing apparatus of the present invention is a polishing apparatus for polishing an optical lens, and is applied with tension by a pressure fluid, and a polished surface of the optical lens is pressed against the dome-shaped elastic body. A polishing apparatus main body including an elastic tool including a chuck to which the optical lens is attached, and a polishing jig for fixing a block jig having the optical lens fixed to the polishing apparatus main body. Is any one of the above-described polishing jigs.
According to such a polishing apparatus of the present invention, since any one of the above-described polishing jigs is provided, the same effects as the polishing jig can be obtained. That is, the contact between the polished surface of the optical lens and the polishing tool can be made substantially uniform, and the polishing time can be shortened, the damage of the optical lens can be reduced, and the life of the polishing tool can be improved.

  Furthermore, the polishing method of the present invention is a polishing method in which the elastic base material is pressed against the surface to be polished of the optical lens while applying tension to the dome-shaped elastic base material composed of an elastic sheet with a pressure fluid. The polishing is performed using the above-described polishing apparatus, and the polishing is performed by fixing the optical lens so that the polished surface of the optical lens has a predetermined inclination.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking as an example polishing of a spectacle lens that is an optical lens, but the present invention is not limited to the following embodiments.

  1 to 7 show an embodiment of the present invention. FIG. 1 is a view showing a polishing apparatus of the present invention, FIG. 2 is a schematic view showing a polishing tool, and FIG. 3 is an inclined surface to be polished. 4 is a flowchart showing a lens manufacturing process, FIG. 5 is a semi-finished lens blocking process, FIG. 6 is a shape creation process, and FIG. 7 is a schematic diagram of the polishing process.

FIG. 1 is a view showing a polishing apparatus 2 of the present invention. The polishing apparatus 2 is an apparatus for polishing a surface to be polished of a spectacle lens (lens base material) 33, and is a target that rotatably holds the spectacle lens 33 attached to a block jig 40 (see FIG. 2). Polishing tool holding unit 21, polishing tool 22 for polishing spectacle lens (lens base material) 33 held by workpiece holding unit 21, polishing tool driving unit 23 for driving polishing tool 22, polishing liquid for supplying polishing liquid A polishing apparatus main body 20 including a supply unit 24 (see FIG. 2) and a polishing jig 1 attached to a chuck 212C of an object holding unit 21 are provided.
As shown in FIG. 2, the polishing tool 22 of the polishing apparatus main body 20 is rotationally driven by a polishing tool drive unit 23, and a cylindrical part 221 in which a flow path of compressed air is formed, and the cylindrical part 221. And a hollow dome-shaped elastic body 222 provided at the tip of each.
Compressed air, which is a pressure fluid, is sent into the elastic body 222, and the load applied to the spectacle lens (lens substrate) 33 can be adjusted by adjusting the pressure of the internal air. Note that a polishing pad (not shown) is attached to the surface of the elastic body 222.

  The polishing tool drive unit 23 has a turntable 231 that is driven to rotate about a vertical axis by a motor (not shown) or the like. The lower end of the cylindrical portion 221 of the polishing tool 22 is detachably attached to the turntable 231. By attaching the polishing tool 22 to the turntable 231, the polishing tool 22 has the center axis of the cylindrical portion 221 as the rotation center, that is, the center of curvature C1 of the dome-shaped portion of the elastic body 222 and the dome-shaped portion. Rotating at a predetermined number of rotations with the line connecting the vertices as the rotation axis. The rotary table 231 is provided with a compressed air pipe (not shown) and communicates with the compressed air flow path of the cylindrical portion 221 of the polishing tool 22.

The workpiece holding unit 21 includes a swing driving device 211 and a workpiece holding device 212 driven by the swing driving device 211.
The swing driving device 211 drives a crank 211B rotated by belt transmission by a motor 211A, and swings an object holding device 212 connected to the crank 211B by a connecting rod 211C.
The to-be-polished object holding device 212 can swing in the front-rear direction between the vertical direction and the rearward tilt angle with the swing shaft 212E as the center. The workpiece holding device 212 is provided with a vertically downward air cylinder 212A at the upper portion, and a chuck 212C to which the polishing jig 1 is attached is provided at the tip of the piston rod 212B of the air cylinder 212A. The chuck 212C is rotationally driven by a motor 212D about a shaft passing through a point where the swing shaft 212E and the central axis of the cylindrical portion 221 of the polishing tool 22 intersect with each other.
As shown also in FIG. 2, such a workpiece holding device 212, that is, the swing center C <b> 2 of the spectacle lens (lens base material) 33 and the curvature center C <b> 1 of the elastic body 222 of the polishing tool 22 are approximately one. I'm doing it. By doing in this way, the adhesiveness of the to-be-polished surface of the spectacle lens 33 and the surface of the elastic body 222 can be maintained constant, and uniform polishing can be performed.

The polishing jig 1 is for attaching a block jig 40 to which a spectacle lens (lens base material) 33, which is an optical lens, is fixed to a chuck 212C of the polishing apparatus body 20, as shown in FIGS. In addition, a mounting part 11 and a fixing part 13 are provided. In addition, the mounting surface 12 provided in the mounting portion 11 in the drawing is a surface that defines the inclination of the polishing jig 1 when the polishing jig 1 is mounted on the chuck 212C of the polishing apparatus 2.
The mounting portion 11 has a substantially truncated cone shape, and a notch 111 is formed on the upper surface thereof. The shape of the mounting portion 11 is the same as the shape of the block jig 40 described later. That is, the polishing jig 1 can be mounted on the chuck 212C of the polishing apparatus main body 20 to which the block jig 40 is conventionally attached.

The fixing portion 13 has a substantially cylindrical shape, and a recess 131 for accommodating a block jig 40 described later is formed therein. A fixing screw 15 for fixing the block jig 40 to the fixing part 13 is attached to the fixing part 13. The fixing screw 15 is inserted into the recess 131 from a direction orthogonal to the insertion direction of the block jig 40, and presses the block jig 40 against the inner surface of the recess 131 to fix the block jig 40 in the recess 131.
Here, one fixing screw 15 is provided. However, the present invention is not limited to this, and two or more fixing screws 15 may be provided. By doing in this way, it becomes possible to match | combine reliably the center part of the recessed part 131 of the mounting part 11, and the center part of the block jig 40, ie, the center of the lens base material 33. FIG. Furthermore, as long as the block jig 40 can be fixed to the fixing portion 13, it is not limited to the fixing screw and is arbitrary. For example, a method using vacuum adsorption can be proposed.

The fixing surface 14 provided in the fixing portion 13 is a surface that defines the inclination of the block jig 40 when the block jig 40 to which the lens base material 33 is fixed is fixed. The fixed surface 14 and the mounting surface 12 are formed with a predetermined inclination so as to offset the difference in inclination and thickness of the surface to be polished of the spectacle lens (lens base material) 33. The inclination is preferably formed and selected according to the prism amount of the spectacle lens, the addition power, and the angle of the astigmatism axis. For example, it is preferable to determine the inclination according to the angle of the astigmatism axis of 70 ° or more and 110 ° or less. Further, it is preferable to determine the slope according to the addition power of 3.00 diopters or less.
For example, in the case of a spherical spectacle lens having a refractive power of 1.60 and a prism amount of 1 prism, the concave surface has an inclination of 0.95 degrees with respect to the convex surface. Use a jig. By preparing a polishing jig for every tilt up to 10 prisms in the same way, it is possible to substantially cope with the polishing of prism spectacle prescription lenses. In addition, regarding the selection of the polishing jig, it is also possible to use a general purpose with one polishing jig for a certain spectacle prescription range. For example, in the case of a lens having a refractive power of 1.60, the prescription for spectacles of 2 prisms to 5 prisms is handled by one polishing jig. For example, the inclination of 2 prisms is 1.91 degrees and the inclination of 5 prisms is 4. Since it is 77 degrees, by using a polishing jig formed at an intermediate inclination of 3.34 degrees, it is possible to substantially cope with spectacle prescriptions of 2 prisms to 5 prisms.

From here, the flow up to the polishing step using the polishing jig 1 according to the present invention will be described in order. FIG. 4 shows a flowchart disclosing the flow up to the polishing step.
First, the semi-finished lens 31 is fixed to the block jig 40 (blocking process, process S1).

  FIG. 5 is a process of fixing the semi-finished lens 31 to a block jig 40 for mounting on a processing machine such as a shape creation device or a polishing device 2. The semi-finished lens 31 is positioned on the block jig 40. While maintaining these positions, for example, a molten low-melting-point alloy 41 is poured between them and hardened, and the semi-finished lens 31 is fixed to the block jig 40. Examples of a method for fixing the block jig 40 and the semi-finished lens 31 include a low melting point alloy, a wax method, and a vacuum suction method.

  In the next shape creation process, as shown in FIG. 6, the block jig 40 with the semifinished lens 31 attached is attached to a chuck 42 of a shape creation device (not shown), and the concave surface 311 of the semifinished lens 31 is cut or ground. Thus, the lens base 33, which is an optical lens (glasses lens) created on a desired refractive surface, is manufactured (processing S2).

  FIG. 7 is a diagram illustrating an example of a step (processing S3) of polishing the lens base material 33. The block jig 40 to which the lens base material 33 is fixed is fixed to the polishing jig 1, and the polishing jig 1 is further fixed. 5 is a view of pressing the surface to be polished against the polishing tool 22 in a state in which is mounted on the chuck 212C of the polishing apparatus 2. FIG.

The surface to be polished created by cutting or grinding is inclined with respect to the block jig 40 like the lens substrate 33 according to the spectacle prescription of the wearer. In order to correct this inclination, the polishing jig 1 is used. First, the block jig 40 is fitted into the fixing portion 13 of the polishing jig 1, and the block jig 40 is fixed with the fixing screw 15. At this time, since the mounting surface 12 and the fixed surface 14 have an inclination, the lens surface 33 is fixed in a direction that cancels the inclination of the surface to be polished of the lens base material 33 with the inclination of the fixed surface 14. For example, how to fix the polishing jig in a progressive focus lens, if the difference in thickness between the near side and the far side is large, the polishing jig is aligned and fixed in the main meridian direction of the lens to fix the thickness of the lens. The difference can be offset. In addition, in the spectacle prescription in which the astigmatic surface and the prism are combined, it is necessary to determine the fixed direction in consideration of the angle of the astigmatic axis and the prism direction. Next, the spectacle lens (lens substrate) 33 is mounted on the workpiece holding device 212 of the polishing apparatus 2 by mounting the mounting portion 11 on the chuck 212 </ b> C of the polishing apparatus 2. The mounted spectacle lens (lens base material) 33 can be separated and approached to the elastic body 222 of the polishing tool 22 by the air cylinder 212A, and is further pressed against the elastic body 222 with a predetermined polishing pressure.
The elastic body 222 having a polishing pad attached to the surface is rotated at a predetermined number of rotations on the turntable 231 while applying tension with a predetermined internal pressure by adjusting the pressure of the compressed air. Then, the spectacle lens (lens base material) 33 is pressed against the elastic body 222 with a predetermined polishing pressure of the air cylinder 212A while rotating at a predetermined rotation speed, and further, the swinging driving device 211 is applied to the spectacle lens (lens base material) 33. The polishing is performed while supplying a swinging motion to the surface of the elastic body 222 from the polishing fluid supply unit 24. Thereby, the to-be-polished surface of the lens base material 33 is finished in a desired surface state.

According to the present invention as described above, the following effects can be obtained.
(1) When the polishing jig 1 of the present invention is not used as in the prior art, depending on the spectacle prescription of the spectacle lens, part of the spectacle lens is not polished and the tool trajectory used in the device for the shape creation process The phenomenon that the tool mark is left or the portion where the contact with the polishing tool is weak does not finish on the mirror surface and remains whitish. In addition, if polishing is performed forcibly to finish the spectacle lens to a mirror surface, the polishing progresses excessively, resulting in a shape change called sagging, or a deviation from the spectacle prescription aimed at the lens power and prism amount. May be frustrated. Further, even if a good surface is obtained, the polishing time until the surface is obtained becomes long.
On the other hand, the polishing jig 1 has a fixing portion 13 for fixing the block jig 40 to which the lens base material 33 is fixed, and a mounting portion 11 for mounting the polishing jig 1 on the chuck 212C of the polishing apparatus 2. The surface 14 that defines the inclination of the fixing portion 13 and the surface 12 that defines the inclination of the mounting portion 11 have a predetermined angle. When the block jig 40 to which the lens base material 33 is fixed is fixed to the polishing jig 1, if the fixing surface 14 of the polishing jig 1 and the surface to be polished of the lens base material 33 are fixed in a direction that cancels each other, The contact of the polishing surface with the polishing tool 22 is improved, the entire surface to be polished can be more uniformly polished, and a tool mark or whitish polishing residue can be prevented. Moreover, since it can grind | polish uniformly, generation | occurrence | production of the shape change called sagging and the shift | offset | difference with spectacle prescription can also be prevented. Furthermore, the time until the entire surface to be polished is finished to a desired surface can be shortened.

(2) Further, since the surface to be polished of the lens base material 33 and the polishing tool 22 come into contact with each other without difficulty, the lens base material 33 is detached from the polishing apparatus 2 and damaged, or the polishing tool 22 is damaged and the tool is damaged. The problem of shortening the service life is improved.
(3) Furthermore, the inclination of the mounting surface 12 of the mounting portion 11 of the polishing jig 1 and the fixing surface 14 of the fixing portion 13 is formed in accordance with the prism amount of the spectacle lens, the addition power, and the angle of the astigmatism axis. Since it corresponds to the inclination of the surface to be polished of the spectacle lens, the contact of the surface to be polished with the polishing tool 22 can be more reliably improved, and the entire surface to be polished can be polished more uniformly.

(4) Since the shape of the mounting portion 11 of the polishing jig 1 is the same as the shape of the block jig 40, the polishing jig 1 according to the present invention can be used without changing the structure of the conventional polishing apparatus body. Can be installed. Therefore, using a conventional polishing apparatus main body, the contact between the lens base material 33 and the polishing tool 22 can be made almost uniform.
For spectacle lenses having a small inclination of the surface to be polished or a spectacle lens having a small difference in thickness, the polishing jig 1 according to the present invention is not used, but a block jig to which the spectacle lens is fixed is directly attached to the polishing apparatus 2. It can be processed with the common polishing apparatus 2 well.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, according to the present invention, the refracting surface formed into a convex surface is either a spherical surface, a rotationally symmetric aspherical surface, a multifocal surface, or a free-form surface. The present invention can be applied to spectacle lenses that are any one of a surface, an aspheric astigmatism surface, and a free-form surface. In addition to this, the present invention can also be applied to the case where a convex surface or both convex and concave surfaces are formed in the shape.
Further, in the above-described embodiment, the spectacle lens (lens base material) 33 is rocked by the rocking drive device 211 to perform polishing. However, the present invention is not limited to this, and as shown in FIG. Polishing may be performed with rocking. Even in this case, polishing can be performed in the same manner as when the spectacle lens 33 is swung.

Next, examples of the present invention will be described.
(Example)
The polishing jig 1 of the above embodiment is used as a lens base material of an inner progressive lens having an astigmatic power minus notation of −4.00 diopter, an astigmatic axis angle of 90 °, and an addition power of 4.00 diopter. Used and polished.
The polishing jig 1 was fixed to the polishing apparatus body 20 in a direction that offsets the inclination of the surface of the lens substrate in the main meridian direction.
In this case, the polishing was completed in 9 minutes and finished to the desired mirror surface.
(Comparative example)
An inner surface progressive focus lens of the same spectacle prescription as in the example was polished without using the polishing jig 1.
Even when polishing was performed for 20 minutes or more, the polishing was not sufficiently performed on the near side in the main meridian direction, and the desired mirror surface was not finished.
From the above, it was possible to confirm the effect of the present invention that the contact between the surface to be polished of the lens substrate and the polishing tool was made substantially uniform and the polishing time could be shortened.

  The present invention can be used for polishing optical lenses such as spectacle lenses.

The schematic diagram which shows the grinding | polishing apparatus of this invention. The schematic diagram which shows the grinding | polishing tool of the said grinding | polishing apparatus. Schematic which shows an example of the grinding | polishing jig | tool by this invention. The flowchart which shows the manufacturing process of the lens of this invention. Schematic which shows the process of fixing a semi finish lens and a block jig. Schematic which shows the process of shaving the concave surface of a semi-finished lens and creating a lens base material. The schematic diagram which shows the grinding | polishing process of the lens using the grinding | polishing jig | tool of this invention. The schematic diagram which shows the principal part of the modification of the grinding | polishing apparatus of this invention. 1 shows a polishing process of a spectacle lens, (a) is a schematic diagram showing a polishing process using a hard polishing tool, (b) is a schematic diagram showing a polishing process using a polishing tool made of an elastic body, FIG. 3C is a schematic diagram showing a conventional polishing process for polishing a lens having a large inclination of a surface to be polished or a lens having a large difference in lens thickness using a polishing tool made of an elastic body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Polishing jig, 2 ... Polishing apparatus, 11 ... Mounting part, 12 ... Mounting surface, 13 ... Fixed part, 14 ... Fixed surface, 20 ... Polishing apparatus main body, 21 ... Polishing object holding part, 22 ... Polishing tool, DESCRIPTION OF SYMBOLS 23 ... Polishing tool drive part, 24 ... Polishing liquid supply part, 212C ... Chuck, 22 ... Polishing tool, 31 ... Semi finish lens, 33 ... Lens base material, 40 ... Block jig, 41 ... Low melting-point alloy, 42 ... Chuck 52 ... Polishing tool, 131 ... Recess, 211 ... Swing drive device, 211A ... Motor, 211B ... Crank, 211C ... Connecting rod, 212 ... Polishing object holding device, 212A ... Air cylinder, 212B ... Piston rod, 212C ... Chuck, 212D ... motor, 212E ... oscillating shaft, 221 ... cylindrical part, 222 ... elastic body, 231 ... rotary table, 311 ... concave surface, 331 ... concave surface, 331A ... part with strong contact 331B ... part is weak per

Claims (1)

In a polishing apparatus main body comprising a polishing tool having a dome-shaped elastic body and a chuck to which a block jig to which an optical lens is fixed is attached,
The block jig is fixed via a polishing jig so that the polished surface of the optical lens has a predetermined inclination,
An optical lens polishing method in which the elastic body is pressed against a surface to be polished of an optical lens while applying tension to the dome-shaped elastic body with a pressure fluid,
The polishing jig includes a fixing portion that fixes the block jig, and a mounting portion that has the same shape as the block jig and is attached to the chuck of the polishing apparatus main body .
The surface that defines the inclination of the block jig in the fixing portion and the surface that defines the inclination by the chuck in the mounting portion are determined based on the prism amount, the addition power, and the astigmatism axis of the optical lens. Formed to be an angle,
The block jig surface that defines the inclination of the block jig in the fixed portion is fixed in a direction to offset the difference in thickness between the near side and the far side in the main meridian of the optical lens A polishing method for an optical lens .

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