JP5206231B2 - Manufacturing method of spectacle lens - Google Patents

Description

  The present invention relates to a method for manufacturing a spectacle lens, and more particularly to a method for manufacturing a spectacle lens to which a prism prescription is added.

In recent years, plastic lenses, which are lighter than glass lenses, are excellent in moldability, processability, dyeability, etc., and are hard to break and high in safety, have rapidly spread and occupy most of them.
There are two methods for manufacturing plastic lenses: a method in which a mold is transferred by a casting method and a finish lens is formed on both surfaces of the final optical surface as a spectacle lens, and one surface is cast by a casting method. A thick semi-finished lens finished on the final optical surface by mold transfer is pre-shaped, and the other surface is cut and polished into a predetermined lens surface shape to create the final optical surface. There is.

In addition, spectacle lenses are roughly classified into single focus lenses and multifocal lenses, and spectacle lenses including a prism prescription for correcting oblique positions (basic misalignment of eye positions) (hereinafter referred to as prism lenses). ) Is also present.
The prism lens uses a semi-finished lens in which a curved surface corresponding to the individual power of the person who uses it is formed on the lens surface (convex surface) that becomes the outer surface when worn, and the prism prescription is applied to the concave surface on the inner side (eyeball side). A predetermined curved surface (a spherical surface, a rotationally symmetric aspherical surface, a non-rotationally symmetric aspherical surface, a toric surface, a progressive surface, or a curved surface obtained by combining these) is cut and polished.

  In such a prism lens manufacturing method, a calculation is performed to incline the processing surface by an arbitrary amount in an arbitrary direction with the intersection of the processing rotation axis and the processing surface as a fulcrum. A method of manufacturing a spectacle lens in which a tangent line creates a processed surface inclined by an angle corresponding to a predetermined prism amount is known (see, for example, Patent Document 1).

Japanese Patent No. 4029576 (page 10, FIG. 1 (b))

However, as shown in Patent Document 1, there is a problem in creating a machining surface in which the tangent at the optical center of the machining surface is inclined by an angle corresponding to a predetermined prism amount with respect to the reference surface of the block jig. 5 will be described.
FIG. 5 is a partially enlarged view of an apparatus for cutting the semi-finished lens 10 by rotating the cutting tool 215 around the cutting tool rotating shaft 216. In FIG. 5, the distance CA between the outer diameter tip of the blade 215 and the outer diameter of the blade rotation shaft 216 must be larger than the maximum height difference LB on the inner surface of the semifinished lens 10. The reason is that when the distance CA is equal to or less than the maximum height difference LB, the maximum height Pmax of the semi-finished lens 10 interferes with the blade rotation axis 216, and the minimum height Pmin of the semi-finished lens 10 cannot be processed. is there.

Therefore, it is conceivable to tilt the semi-finished lens 10 to reduce the maximum height difference LB. Specifically, after the semi-finished lens 10 is rotated in the direction in which the base direction of the prism is lowered about the intersection of the processing rotation axis and the processing surface by the amount of the convex prism, the processing data of the concave surface is With respect to the point, it is conceivable to incline it by rotating it by the amount of the prism in the direction in which the base direction decreases.
In this case, a deviation occurs with respect to the prescription prism amount (prism power). The deviation of the prism varies depending on the lens thickness at the optical center of the lens and the prescription prism amount, and increases as the lens thickness increases or the prescription prism amount increases.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
The spectacle lens manufacturing method according to this application example is a spectacle lens manufacturing method to which a prism prescription is added, and the spectacle lens base material in which a curved surface based on the prescription is formed on one surface serving as an outer surface is provided on the outer surface. With the center of the spectacle lens base as a rotation center, the spectacle lens base is tilted in the direction in which the base direction is lowered by the amount of prisms based on the prism prescription, and then the processing data of the other surface of the spectacle lens is And the other surface is cut to create a lens surface shape to which the prism prescription is added.

  According to this manufacturing method, a spectacle lens base material in which a curved surface based on a prescription is formed on one surface serving as an outer surface, the amount of prisms based on the prism prescription, the base direction, with the center of the spectacle lens base material on the outer surface as the rotation center The spectacle lens to which the prism is added is easily obtained by inclining in the direction in which the lens is lowered and cutting the other surface of the spectacle lens substrate to create a lens surface shape to which the prism prescription is added. Further, by tilting in the direction in which the base direction is lowered by the amount of prism based on the prism prescription, the height difference of the other surface to be cut can be reduced. Therefore, efficient cutting becomes possible, and it becomes easy to fit within the workable range of the cutting device for cutting. Furthermore, it is possible to obtain a spectacle lens in which the amount of prism misalignment caused by tilting the spectacle lens substrate is approximately 0 (zero).

[Application Example 2]
In the spectacle lens manufacturing method according to the application example described above, the cutting of the other surface of the spectacle lens base material is performed on manufacturing data with a cutting center at the intersection of the processing surface of the lens surface shape to be created and the processing rotation axis. Preferably based on

  According to this manufacturing method, a spectacle lens base material in which a curved surface based on a prescription is formed on one surface serving as an outer surface, the amount of prisms based on the prism prescription, the base direction, with the center of the spectacle lens base material on the outer surface as the rotation center The prism prescription is added by cutting the other side of the spectacle lens substrate based on manufacturing data with the cutting center at the intersection of the processing surface of the lens surface shape to be created and the processing rotation axis. By creating such a lens surface shape, it is possible to obtain a spectacle lens having a prism displacement amount of approximately 0 (zero).

[Application Example 3]
In the eyeglass lens manufacturing method according to the application example, the lens surface shape is at least a spherical surface, a toric surface, a rotationally symmetric aspherical surface, a non-rotationally symmetric aspherical surface, a curved surface obtained by combining a toric surface and an aspherical surface, a progressive surface, or a progressive surface. It is preferably one of curved surfaces obtained by combining a surface and a toric surface.

  According to this manufacturing method, the lens surface shape created by the cutting process is a spherical surface, a toric surface, a rotationally symmetric aspherical surface, a non-rotary symmetric aspherical surface, a curved surface obtained by combining a toric surface and an aspherical surface, a progressive surface, or a progressive surface. Even a complicated curved surface such as a curved surface synthesized with a toric surface can create a lens surface shape to which a prism prescription is added.

  Hereinafter, a method for manufacturing a spectacle lens according to the present embodiment will be described with reference to the drawings.

  The method for manufacturing a spectacle lens according to this embodiment is a method for manufacturing a spectacle lens to which a prism prescription is added (hereinafter referred to as a prism lens), and includes a blocking step, a cutting step, a polishing step, and a deblocking step.

FIG. 1 is a schematic diagram illustrating a lens processing state for each main process in the spectacle lens manufacturing method according to the present embodiment.
FIG. 1A shows a lens aspect in the blocking process, FIG. 1B shows a lens aspect before the cutting process, and FIG. 1C shows a lens aspect in the cutting process. FIG. 1 (d) shows a lens mode in the polishing step, and FIG. 1 (e) shows a lens mode after the deblocking step.

  In the blocking step shown in FIG. 1A, a semi-finished lens 10 as a spectacle lens substrate is bonded to a block jig 20 for attaching to a cutting device, a polishing device or the like via a block material 30 such as a low melting point metal. Fix it.

The semi-finished lens 10 is manufactured using a tape mold method or the like.
In the tape molding method, a glass mold that molds one surface (convex surface) 11 serving as an outer surface of a lens and a glass mold that molds the other surface (concave surface) 12 of the lens are arranged to face each other at a predetermined interval. A lens raw material monomer is injected into a gap (cavity) sealed by winding an adhesive tape or the like around the outer peripheral side surface of the glass mold, and then the glass mold is removed from the mold.

In the semi-finished lens 10, a spherical surface corresponding to the individual power of the user who becomes the final optical surface is transferred to the convex surface 11 in a glass mold. On the other hand, the concave surface 12 is transferred with a glass mold in a shape of a center thickness considering the prism amount based on the prism prescription, and is formed to be considerably thicker than the finished lens thickness.
The block jig 20 is a ring-shaped member provided with an injection hole 21 for injecting a low melting point metal to be the block material 30.

  For bonding and fixing the semi-finished lens 10 and the block jig 20, a prism ring 40 indicated by a two-dot chain line in the drawing is used. The prism ring 40 is a box-shaped member composed of a circular bottom plate and a peripheral wall surrounding the periphery. The upper edge of the peripheral wall gives a predetermined prism amount (prism power) to the finished lens in accordance with the prism prescription of the user. In order to add, it is formed obliquely (inclined). A method for adding the prism amount will be described later.

  For adhesion and fixation, the semi-finished lens 10 is placed on the prism ring 40 after the ring outer peripheral surface of the block jig 20 is fitted into a through-hole formed in the bottom plate of the prism ring 40. Then, the low melting point metal melted from the injection hole 21 of the block jig 20 is poured into the cavity formed by the semi-finished lens 10, the prism ring 40, and the block jig 20, and the low melting point metal is solidified. Thereafter, the prism ring 40 is removed, and the semi-finished lens 10 is bonded and fixed to the block jig 20 via the block material 30.

  The semi-finished lens 10 bonded and fixed to the block jig 20 via the block material 30 is attached to a cutting device or a polishing device in the cutting process and the polishing process, and the concave surface 12 is cut and polished. That is, shape creation is performed. During such processing, the ring-shaped central axis MA of the block jig 20 is fixed so as to coincide with the processing central axis of each processing apparatus. Further, the semi-finished lens 10 has a curved optical center formed on the lens surface (convex surface) 11 (in this embodiment, the geometric center of the semi-finished lens 10 coincides) with the central axis MA of the block jig 20. Adhered and fixed to match.

A method of adding the prism amount in the adhesive fixing of the semi-finished lens 10 will be described.
FIG. 2A is a partial side view of the semi-finished lens adhesive fixing portion for explaining the prism amount adding method according to the present embodiment. FIG. 2B is an enlarged view of the portion a in FIG. FIG. 2A and 2B, the block jig 20 is omitted.

  2A and 2B, the semi-finished lens 10 includes a semi-finished lens 60 (shown in the drawing) arranged so that the geometric center axis of the semi-finished lens 10 coincides with the center axis MA of the block jig 20. Is attached to the block jig 20 by being inclined in the direction in which the base direction is lowered by the amount of the prism. Specifically, with the optical center point A of the convex surface 11 as the center of rotation, the base direction is tilted in a direction that decreases by the amount of prism (angle θ for adding the prism). The base direction is the direction in which the lens thickness of the finished lens that has been cut and polished is thick. The base direction in FIGS. 2A and 2B is the left side direction in the vertical view of the drawing.

  When the base direction of the semi-finished lens 10 is tilted downward, the intersection B with the central axis MA in the center thickness ct of the completed lens rotates to the position of the point C. Thereby, the surface 60a (indicated by a two-dot chain line in the drawing) of the semi-finished lens 60 before being tilted in the direction in which the base direction is lowered is a predetermined surface of the surface 10a (indicated by a broken line in the drawing) rotated and moved along with the point C. A cutting surface 13 when the surface shape (spherical surface, rotationally symmetric aspherical surface, nonrotationally symmetric aspherical surface, toric surface, progressive surface, or a curved surface obtained by combining these) is cut in the semi-finished lens 10 in a cutting process described later. (See FIG. 1B). Therefore, hereinafter, in FIG. 1, the surface 10 a may be expressed as a surface 13 or a cutting surface 13, a lens surface 13, or a convex surface 13.

  As shown in the surface 10a and the surface 60a, when the prism prescription is added to the semi-finished lens 10, the surface 10a is bonded and fixed to the block jig 20 by tilting the semi-finished lens 10 by the prism amount in the direction in which the base direction is lowered. Can reduce the level difference of the surface 10a to be cut as compared with the surface 60a. Therefore, efficient cutting becomes possible, and it becomes easy to fit within the workable range of the cutting device.

  On the other hand, FIG. 3 is a partial side view of the adhesive fixing portion of the semi-finished lens. Specifically, the semi-finished lens 70 is tilted by rotating the optical center point A around the optical center point A by a prism amount in a direction in which the base direction of the prism is lowered, and then processing data of the cutting surface 70a is converted to the base direction of the prism. FIG. 6 is a partial side view of an adhesive fixing portion of a semi-finished lens that is tilted by rotating about the intersection D between the center axis MA of the block jig 20 and the center thickness ct of the lens by the amount of prism in the downward direction. In FIG. 3, the block jig 20 is omitted as in the case of FIG.

  In this method, when the cutting surface 70a inclined by an angle θ corresponding to a predetermined prism amount with the intersection D as the center is created, a deviation amount δ is generated on the concave surface (cutting surface 70a) with respect to the convex surface. As a result, a prism displacement amount PG is generated with respect to the prism amount (prism power) of the prism prescription.

The deviation amount δ (mm) is defined as D1 as the surface refractive power of the convex surface, ct (mm) as the center thickness of the finished lens, and θ (°) as the inclination angle for adding the prism amount P (prism diopter) of the prism prescription. Then, it is represented by the following general formula (1).
δ = ct × tan θ (1)
The prism displacement amount PG (prism diopter) at that time is expressed by the following general formula (2) based on the Prentice formula.
PG = δ × 0.1 × D1 (2)

Table 1 shows an example of calculation of the deviation amount PG of the prism by the deviation amount δ and the deviation amount δ.
Table 1 shows that both semi-finished lenses 10 are made of a thiourethane resin having a refractive index (n) of 1.67, D1 is 6.33 and 1.00, ct is 9.0 mm and 1.1 mm, and P is 3 In four examples of Calculation Example 1 to Calculation Example 4 in which .00Δ (prism diopter) and 0.25Δ (that is, inclination angles θ for adding P are 2.56 ° and 0.21 °) are selectively combined. The calculation results of the deviation amount δ and the prism deviation amount PG are shown together with the combinations thereof.

表１において、ズレ量δ及びズレ量δによるプリズムのズレ量ＰＧは、凸面の面屈折力Ｄ１、中心厚ｃｔ又はプリズムを付加するための傾き角度θ（プリズム量Ｐ）の値が大きく成る程大きくなり、ＪＩＳ規格（JIS T7313、JIS T7314、JIS T7315）に記載されるプリズム屈折力の表示値（プリズム度数）に対する許容差を確保するのが難しくなる。例えば、計算例１（Ｄ１：６．３３、ｃｔ：９．０ｍｍ、Ｐ：３．００）におけるプリズムのズレ量ＰＧは、０．２５５Δの大きな値となる。

In Table 1, the amount of deviation δ and the amount of deviation PG of the prism due to the amount of deviation δ increase as the value of the convex surface refractive power D1, the center thickness ct, or the inclination angle θ (prism amount P) for adding the prism increases. It becomes large and it becomes difficult to ensure the tolerance with respect to the display value (prism power) of the prism refractive power described in the JIS standard (JIS T7313, JIS T7314, JIS T7315). For example, the prism displacement amount PG in Calculation Example 1 (D1: 6.33, ct: 9.0 mm, P: 3.00) is a large value of 0.255Δ.

On the other hand, the prism amount adding method of the present embodiment described above (the concave processing data is set to the rotation center at the optical center point A of the convex surface 11 and the prism amount (inclination angle θ for adding the prism), the basis. By using a method of tilting in a direction in which the direction is lowered (see FIG. 2), a finished lens having a prism displacement amount PG of approximately 0 (zero) can be obtained after shape creation.
Then, in the blocking process, the semi-finished lens 10 bonded and fixed to the block jig 20 via the block material 30 moves to the cutting process.

As shown in FIG. 1B, the cutting process is performed by cutting the concave surface 12 of the semi-finished lens 10 and adding a prism surface based on a prism prescription to a lens surface 13 having a predetermined curved surface (two points in the figure). This is a process of creating (shaving) a chain line). In the cutting process, cutting is performed using a cutting device having a numerically controlled cutting function.
FIG. 4 is a schematic diagram showing a schematic configuration of the cutting apparatus.

  In FIG. 4, the cutting apparatus 200 includes an X-axis positioning unit 202 and a Y-axis positioning unit 210 on a bed 201. The computer 300 for calculation connected to the X-axis positioning means 202 and the Y-axis positioning means 210, the host computer 310 connected to the calculation computer 300, and the input means 320 are provided.

  The X-axis positioning means 202 is driven in the X-axis direction (perpendicular to the paper surface) by the X-axis drive motor and encoder 204. A workpiece axis rotating unit 205 is provided on the X-axis positioning unit 202, and a workpiece chuck 208 attached to a workpiece rotating shaft 207 as a processing rotating shaft is driven to rotate by a workpiece rotating axis driving motor and encoder 206. In addition, the rotational position of the workpiece can be determined. The workpiece is a semi-finished lens 10 to be cut and is held by the workpiece chuck 208 via a block jig 20 (not shown).

The Y-axis positioning means 210 is driven in a substantially horizontal Y-axis direction by a Y-axis drive motor and encoder 211. On the Y-axis positioning unit 210, a Z-axis positioning unit 212 and a blade rotating unit 213 are provided via a Z-axis column 214.
The blade (circular cutter) 215 is rotationally driven by the blade rotating means 213 via the blade rotating shaft 216. The cutting tool 215 and the cutting tool rotating means 213 can be moved up and down in the Z-axis direction by the Z-axis driving motor and the encoder 217 of the Z-axis positioning means 212. The Z-axis positioning means 212 is provided mainly for the purpose of matching the center heights of the semi-finished lens 10 and the circular cutter 215.

  The computer 300 for calculation is processed into manufacturing data for cutting a predetermined curved surface based on prescription data such as S (spherical) power, prism power, lens thickness, lens diameter, color, etc. input by the input means 320. . The processed manufacturing data is stored in a storage unit (not shown) in the computer.

  Note that manufacturing data for cutting a predetermined curved surface of the lens surface 13 to which the prism prescription is added is an intersection point B (FIG. 5) between the surface 13 and the central axis MA when the base direction of the semifinished lens 10 is tilted downward. 2 (a) and (b)) is corrected (corrected) so as to be the machining center. In other words, the intersection point B is an intersection point between the processed surface of the surface 13 to be cut and the workpiece rotation axis 207.

  The host computer 310 has a function of storing received prescription data when prescription data for a spectacle lens desired by a customer is transmitted online from a terminal provided in a spectacle retailer. Therefore, in this case, input from the prescription data input means 320 can be omitted.

Next, a method for cutting the semi-finished lens 10 using the cutting apparatus 200 configured as described above will be briefly described.
First, prescription data such as S (spherical) power, prism power, lens thickness, lens diameter, color, and the like are input from the input unit 320 to the computer 300 for calculation. In the computer 300 for calculation, it is processed into the manufacturing data which cuts a curved surface based on the input prescription data, and is stored in the memory | storage part in a computer. The manufacturing data also includes data for correcting the machining center for cutting the surface 13 to the intersection B.

Then, the block jig 20 to which the semi-finished lens 10 is bonded and fixed via the block material 30 is attached to the work chuck 208 of the cutting apparatus 200 and gripped.
When the operation switch of the cutting apparatus 200 is turned ON, the positioning axis at the center coordinate of the circular cutter 215 is cut by the semi-finished lens 10 by the X-axis positioning unit 202, the Y-axis positioning unit 210, and the workpiece axis rotating unit 205. The processing center point (intersection B, see FIG. 2) is determined based on the manufacturing data processed by the computer 300 after positioning in the normal direction set up at the processing center point (intersection B, see FIG. 2) on the surface 13. The center coordinates of the circular cutter 215 corresponding to) are continuously positioned, and thereby cutting to create a predetermined curved surface (surface 13) to which a prism based on the prism prescription is added is performed.

  Then, as shown in FIG. 1C, the semi-finished lens 10 with the concave surface 12 cut is formed with a cut surface (surface 13) formed of a predetermined curved surface to which a prism based on a prism prescription is added, A lens 100 to be a finish lens (finished lens) is formed. The surface roughness Rmax of the surface 13 cut in the cutting process is about 0.1 μm to 10 μm.

The cutting process can include outer diameter machining and chamfering.
The outer diameter machining is a process in which an unnecessary outer peripheral portion of the semi-finished lens 10 is trimmed by machining to reduce it to a predetermined outer diameter, and the diameter of the prescription is far away from the outer diameter of the semi-finished lens 10. It is performed as necessary when the size is small.

The chamfering process is a process of chamfering the outer peripheral edge because the edge of the cut lens is sharp and dangerous, and is easily chipped. In addition, the cutting process is performed by a rough cutting process that quickly cuts the thickness of the semi-finished lens 10 having a considerable thickness and finishing it to a predetermined thickness, and a finishing cutting process that precisely creates a desired lens surface shape by cutting. be able to.
And it transfers to a grinding | polishing process.

In the polishing step, as shown in FIG. 1D, the cutting surface (surface 13) cut in the cutting step is polished.
In the polishing process, the rubber sheet 52 having a hemispheric shape and flexibility is attached to the casing 51 so as to form a sealed space with the casing 51, and a pressure gas or liquid is press-fitted into the sealed space to form the rubber sheet. A copying polishing tool 50 having a structure capable of applying pressure from the inside of the rubber sheet so as to maintain a hemispherical shape is used.

  The copying polishing tool 50 attaches a polishing cloth (not shown) such as a non-woven fabric to the surface of the rubber sheet 52, and rotates and swings the casing 51 to press the polishing liquid against the lens surface 13 while pressing the polishing liquid on the rubber sheet 52. And the lens surface 13 are supplied to perform mirror polishing.

In the copying polishing tool 50, since the rubber sheet 52 contacts the lens surface 13 with a uniform pressure, even if the lens surface 13 is a complicated curved surface, the rubber sheet 52 follows the shape of the lens surface 13 and polishes uniformly. can do. By the polishing process in this polishing process, the surface roughness Rmax of the lens surface 13 of the lens 100 is finished to a final lens surface of about several tens of nm.
And it transfers to a deblocking process.

  In the deblocking step, the lens 100 that has been ground and polished to create the shape of the lens surface 13 is separated from the block jig 20 that is bonded and fixed via the block material 30. In the separation method, a light impact is applied to the lens 100 to separate the block material 30 from the lens 100. As a result, as shown in FIG. 1E, a spherical surface corresponding to the individual power of the person used on the convex surface 11 is formed, and a lens surface 13 formed of a curved surface with a prism based on a prism prescription is formed on the concave surface side. The finished finish lens 100 is completed.

The finished finish lens 100 is subjected to a cleaning process and an inspection in order to remove attached dirt.
Then, after performing a dyeing process, a hard coat film forming process, an antireflection film forming process, etc. as necessary, the lens subjected to the target lens shape processing (edge processing) to match the shape of the inner peripheral edge of the spectacle frame is spectacles. Fit into the frame to complete the glasses.

  As described above, according to the spectacle lens manufacturing method of the present embodiment, the optical center point A of the convex surface 11 of the semifinished lens 10 in which the spherical surface based on the prescription is formed on the convex surface 11 serving as the outer surface is used as the rotation center. The surface 13 and the central axis when the semifinished lens 10 is tilted in the direction in which the base direction is lowered by the amount of prism (angle θ for adding the prism), and the base direction of the semifinished lens 10 is tilted in the downward direction. By cutting the concave surface 12 of the semi-finished lens 10 based on the manufacturing data corrected (corrected) so that the intersection B with the MA becomes the processing center, and creating the lens surface 13 to which the prism prescription is added. Thus, a finish lens (finished lens) 100 having a prism displacement amount of approximately 0 (zero) can be obtained.

  Moreover, the height difference of the concave surface 12 to be cut can be reduced by inclining in the direction in which the base direction is lowered by the amount of prism based on the prism prescription. Therefore, efficient cutting becomes possible, and it becomes easy to fit within the workable range of the cutting device 200 for cutting. Furthermore, the lens surface shape created by the cutting process is a spherical surface, a toric surface, a rotationally symmetric aspherical surface, a non-rotationally symmetric aspherical surface, a curved surface combining a toric surface and an aspherical surface, a progressive surface or a progressive surface and a toric surface. Even for a complicated curved surface such as a curved surface, a prism prescription is added, and a lens surface 13 having a prism displacement amount of approximately 0 (zero) can be created.

  In the above-described embodiment, the case where a spherical surface based on prescription is formed on the convex surface 11 of the semi-finished lens 10 serving as the outer surface has been described, but a toric surface, a rotationally symmetric aspherical surface, a non-rotationally symmetric aspherical surface, a toric surface and a non-spherical surface. It may be a curved surface obtained by combining a spherical surface, a progressive surface, or a curved surface obtained by combining a progressive surface and a toric surface. In that case, a curved surface based on the prescription is created on the lens surface 13 that is ground and polished and added with a prism based on the prism prescription to create a shape.

(A)-(e) is a schematic diagram which shows the processing state of the lens for every main process in the manufacturing method of the spectacle lens which concerns on this embodiment. (A) is a partial side view of the semi-finished lens adhesion fixing part for explaining the prism amount adding method according to the present embodiment, and (b) is a partially enlarged view showing an a part in (a). The partial side view of the adhesion fixing part of the semifinished lens which shows the addition method of prism amount. The schematic diagram which shows schematic structure of a cutting device. The elements on larger scale of the apparatus which cuts a semi finish lens.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,60 ... Semi finish lens as a spectacle lens base material, 11 ... Convex surface, 12 ... Concave surface, 13 ... Cutting surface, 20 ... Block jig, 21 ... Injection hole, 30 ... Block material, 40 ... Prism ring, 50 ... Polishing tool, 51 ... Case, 52 ... Rubber sheet, 100 ... Finish lens, 200 ... Cutting device, 201 ... Bed, 202 ... X axis positioning means, 205 ... Work axis rotation means, 207 ... Work rotation axis, 208 ... Work Chuck 210 ... Y-axis positioning means 212 ... Z-axis positioning means 213 ... Blade rotating means 215 ... Blade tool 300 ... Computing computer 310 ... Host computer 320 ... Input means

Claims (3)

A method of manufacturing a spectacle lens to which a prism prescription is added,
A spectacle lens base material in which a curved surface based on prescription is formed on one surface as an outer surface, with the center of the spectacle lens base material on the outer surface as a rotation center, the amount of prisms based on the prism prescription is reduced in the base direction. Tilt the spectacle lens substrate,
Thereafter, the processing data of the other surface of the spectacle lens is tilted in the direction in which the base direction is lowered by the amount of the prism with the center as the rotation center,
A method of manufacturing a spectacle lens, wherein the other surface is cut to create a lens surface shape to which the prism prescription is added. In the manufacturing method of the spectacle lens according to claim 1,
The cutting process of the other surface of the spectacle lens substrate is performed based on manufacturing data having a cutting center at an intersection of a processing surface of the lens surface shape to be created and a processing rotation axis. Production method. In the manufacturing method of the spectacle lens of Claim 1 or 2,
The lens surface shape is at least a spherical surface, a toric surface, a rotationally symmetric aspherical surface, a non-rotary symmetric aspherical surface, a curved surface composed of a toric surface and an aspherical surface, a progressive surface or a curved surface composed of a progressive surface and a toric surface. A method of manufacturing a spectacle lens, wherein the number is one.

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