JP6364482B2 - Manufacturing method of spectacle lens - Google Patents

Description

  The present invention relates to a lens blank, a lens matrix, a method for manufacturing a lens blank, and a method for manufacturing a lens.

  In the spectacle lens manufacturing process, there is a process of cutting and polishing a semi-finished product lens (semi-finished lens) in accordance with the wearer's prescription (for example, see Patent Document 1 below). The semi-finished lens has a convex surface that has been optically designed in advance and a concave surface that is subjected to cutting and polishing. Prior to the cutting and polishing, the semi-finished lens is subjected to a blocking process in which a fixing jig is bonded to the convex surface with an alloy. The semi-finished lens is cut and polished while being supported via a fixing jig. In order to bond the semi-finished lens and the fixing jig, an adhesive material such as an alloy is filled in the space between the semi-finishing lens and the fixing jig.

International Publication No. 98/16862

  By the way, the design of the processing amount of the concave surface of the semi-finished lens is limited because it depends on the optical design of the convex surface. Therefore, it is considered that a spectacle lens suitable for the wearer's prescription can be provided if both the convex and concave surfaces can be processed. However, in order to process the convex surface, the concave surface side is fixed to the fixing jig, and it is difficult to spread the adhesive between the concave surface and the fixing jig. As a result, the adhesive force between the semi-finished lens and the fixing jig is insufficient, and processing defects may occur.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a technique that enables a lens blank to be stably fixed to a fixing jig.

According to the aspect of the present invention, the convex shape of the second surface in the lens blank having a convex first surface and a second surface that is disposed opposite to the first surface and includes a convex or planar surface. The surface of the first surface is fixed to a fixing jig via an adhesive, and the shape of the first surface is processed by supporting the fixing jig fixed to the convex or planar surface of the second surface. And fixing the processed convex surface of the first surface to the fixing jig via an adhesive, and supporting the fixing jig fixed to the convex surface of the first surface And a method of manufacturing a spectacle lens including processing the shape of the second surface.
According to a first aspect of the present invention, there is provided a lens blank having a convex first surface and a second surface disposed opposite to the first surface and including a convex or planar surface. .

  According to the second aspect of the present invention, there is provided a lens matrix used for manufacturing a lens blank, the first member having a concave surface and the concave surface of the first member. A lens matrix is provided that includes a second member having a concave or planar surface and a third member that partitions the space between the first member and the second member from the outside.

  According to the third aspect of the present invention, a first member having a concave surface, which is used for manufacturing a lens blank, and a concave shape or a flat surface arranged opposite to the concave surface of the first member. A lens in a space partitioned by a third member of a lens matrix, the second member having a shape-like surface, and a third member that partitions the space between the first member and the second member from the outside. A method of manufacturing a lens blank is provided that includes filling the material and curing the lens material.

  According to the fourth aspect of the present invention, a lens blank having a convex first surface and a second surface disposed opposite to the first surface and including a convex or planar surface is manufactured. And fixing the convex surface of the second surface of the lens blank to the first fixing jig via an adhesive, and the first fixing jig fixed to the convex surface of the second surface And processing the shape of the first surface, fixing the processed convex surface of the first surface to the second fixing jig via an adhesive, and the convex shape of the first surface And a second fixing jig that is fixed to the surface of the lens and processing the shape of the second surface.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which enables a lens blank to be stably fixed to a fixing jig can be provided.

It is a figure which shows an example of a spectacle lens. It is a figure which shows the lens blank which concerns on this embodiment. It is a flowchart which shows the manufacturing method of the spectacle lens which concerns on this embodiment. It is a figure which shows the lens mother die concerning this embodiment. It is a flowchart which shows the method of cutting and polishing a lens blank. It is process drawing which shows the process of fixing a fixing jig to the 2nd surface of a lens blank. It is a figure which shows the process of shape-processing the 1st surface of a lens blank. It is process drawing which shows the process of fixing a fixing jig to the 1st surface of a lens blank. It is a figure which shows the process of shape-processing the 2nd surface of a lens blank. It is a figure which shows the modification of a lens blank.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a diagram illustrating an example of a spectacle lens GL. 1A is a plan view of the spectacle lens GL, FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A, and FIG. 1C is a relationship between the spectacle lens GL and the lens blank. FIG.

  As shown in FIG. 1A, the eyeglass lens GL is a lens formed in a shape that approximates the shape of the eyeglass frame F in plan view. The planar shape of the eyeglass lens GL in FIG. 1 is a track shape, but may be other planar shapes such as a circle, an ellipse, and a rhombus. Although FIG. 1 shows the left-eye spectacle lens GL, the right-eye spectacle lens is symmetric with the left-eye spectacle lens, and a description thereof will be omitted.

  The spectacle lens GL is formed of, for example, plastic or glass. The spectacle lens GL has a predetermined optical center P. The optical center P is formed at a position corresponding to the fitting point of the wearer. The fitting point is a pupil position (eye point) of the wearer when the spectacle lens GL is worn. This eye point is the line-of-sight position on the lens when the wearer is viewing horizontally. A geometric center Q is set for the spectacle lens GL.

  As shown in FIG. 1B, the spectacle lens GL has a convex lens surface La formed in a convex shape and a concave lens surface Lb formed in a concave shape. In the present embodiment, the convex lens surface La and the concave lens surface Lb are each formed by cutting and polishing both surfaces of the lens blank LB in accordance with the wearer's prescription.

  The lens blank LB is sometimes referred to as a lens block or the like, and is a lens that is the basis of the spectacle lens GL. The lens blank LB is formed into the spectacle lens GL by cutting and polishing. Therefore, the lens blank LB is formed of the same material as the spectacle lens GL, for example, plastic or glass. As shown in FIG. 1C, the lens blank LB is a lens formed in a circular shape in plan view. The lens blank LB has a geometric center O.

  FIG. 2 is a diagram illustrating the lens blank LB according to the present embodiment. FIG. 2A is a perspective view seen from the back side that becomes the concave lens surface Lb after cutting and polishing. FIG. 2B is a plan view seen from the back side, and FIG. 2C is a cross-sectional view taken along the line BB of FIG.

  The lens blank LB has a first surface 1 and a second surface 2 arranged opposite to the first surface 1. The first surface 1 side of the lens blank LB becomes the convex lens surface La side of the spectacle lens GL by shape processing such as cutting and polishing. The first surface 1 is formed in a convex shape (see FIG. 2C). The second surface 2 side of the lens blank LB becomes the concave lens surface Lb side of the spectacle lens GL by shape processing such as cutting and polishing. The second surface 2 includes a convex surface 2a and a concave surface 2b.

  A convex portion 3 is provided on the second surface 2 side of the lens blank LB, and the convex surface 2 a is the surface of the convex portion 3. In the present embodiment, the convex surface 2a has an axisymmetric shape. In FIG. 2, the convex surface 2a has a spherical shape, but may have a parabolic shape. The paraboloid is a three-dimensional outer surface obtained by rotating a parabola around its axis of symmetry.

  The convex part 3 is arrange | positioned in the area | region containing the geometric center O, when the 2nd surface 2 is planarly viewed like FIG. 2 (B). Here, when the second surface 2 is viewed in plan, the center of the convex portion 3 substantially coincides with the geometric center O. When the second surface 2 is viewed in plan, the diameter φ2 of the convex portion 3 (the diameter of the convex surface 2a) may be 20% to 100% of the diameter φ1 of the second surface 2, It may be 50% or more and 70% or less of the diameter φ1 of the second surface 2 and is about 60% of the diameter φ1 of the second surface 2 in FIG. The diameter φ1 of the second surface 2 (the diameter of the lens blank LB) is about 80 mm, for example, and the diameter φ2 of the convex portion 3 is about 48 mm.

  The concave surface 2b is arranged around the convex portion 3 and continues to the edge 2E of the second surface 2. Here, as shown in FIG. 2C, the distance from the tangent plane OP at the geometric center O of the first surface 1 to the surface of the second surface 2 measured in the normal direction is referred to as height. The height at each position of the second surface 2 decreases from the edge 2E of the second surface 2 toward the geometric center O, and after reaching a minimum, starts to increase. The position where the height is minimized is the boundary between the convex surface 2a and the concave surface 2b. In the present embodiment, the height of a part of the convex portion 3 is equal to or higher than the height of the edge 2E of the second surface 2. That is, a part of the convex portion 3 protrudes on the opposite side of the first surface 1 as compared with the edge of the second surface. The maximum height of the convex portion 3 may be equal to or less than the height of the edge of the second surface.

  The convex portion 3 is formed integrally with a portion including the concave surface 2b. That is, the convex portion 3 is formed of the same material for both the portion including the concave surface 2 b and the portion including the first surface 1. The portion including the convex surface 2a is continuous with the portion including the first surface 1 without an interface. In the convex portion 3, the thickness of the lens blank LB tends to increase from the outer peripheral side toward the geometric center O.

  In the present embodiment, the radius of curvature of the convex surface 2 a at the position of the tip 3 a (geometric center O) of the convex portion 3 is the curvature of the first surface 1 at the position of the vertex 1 a (geometric center O) of the first surface 1. It is smaller than the radius. The curvature radius of the convex surface 2 a may be the same as the curvature radius of the first surface 1 or may be larger than the curvature radius of the first surface 1.

  By the way, the lens blank LB is a lens processed into the spectacle lens GL, and the first surface 1 and the second surface 2 are each subjected to shape processing such as cutting and polishing. The convex part 3 as described above can be used as a fixing part (connecting part) to a fixing jig when performing at least one of cutting and polishing on the first surface 1 (later FIG. 6, FIG. 7). Hereinafter, a method for manufacturing the spectacle lens GL will be described.

  FIG. 3 is a flowchart showing a method for manufacturing the spectacle lens GL according to the present embodiment. Here, a case where the lens blank LB is a plastic lens will be described as an example. In order to manufacture the spectacle lens GL, a lens material is prepared in step S1. The lens material may contain an ultraviolet curable resin or may contain a thermopolymerizable resin such as diethylene glycol bisallyl carbonate. The lens material may contain a catalyst, an ultraviolet absorber, and the like. The lens material may be prepared by mixing, or may be purchased and prepared.

  In the next step S2, a lens matrix is prepared. FIG. 4A is an exploded perspective view showing the lens matrix 5 according to this embodiment, and FIG. 4B is a cross-sectional view taken along the line AA in FIG.

  The lens matrix 5 is made of, for example, chemically strengthened glass. The lens matrix 5 includes a first member 6 having a concave surface 6 a, a second member 7 having a surface 7 a disposed opposite to the concave surface 6 a of the first member 6, and the first member 6. And a third member 8 that partitions the space between the first member 7 and the second member 7 from the outside.

  The first member 6 is a so-called lower mold, and is a part that determines the shape of the first surface 1 of the lens blank LB shown in FIG. As shown in FIG. 4B, the concave surface 6a of the first member 6 is set to the same shape as the first surface 1 of the designed lens blank LB. The second member 7 is a so-called upper mold, and is a part that determines the shape of the second surface 2 of the lens blank LB. The surface 7a of the second member 7 is set to the same shape as the second surface 2 of the designed lens blank LB. The surface 7 a of the second member includes a concave surface 7 b that defines the convex surface 2 a of the second surface 2 and a convex surface 7 c that defines the concave surface 2 b of the second surface 2.

  The third member 8 is a so-called gasket and defines a gap between the first member 6 and the second member 7. That is, the third member 8 is a part that determines the thickness of the lens blank LB. The third member 8 is provided so as to annularly surround the space between the first member 6 and the second member 7 facing each other. As shown in FIG. 4B, a space SP1 partitioned from the outside is formed inside the assembled lens matrix 5.

  Returning to the description of FIG. 3, in step S2, the lens matrix is cleaned and assembled. Next, a lens material is injected into the lens matrix 5 (stick S3). The third member 8 of the lens matrix 5 is provided with an injection port (not shown) that communicates with the space SP1, and the lens material is filled into the space SP1 through this injection port.

  Next, in step S4, the lens material is polymerized (cured). In step S4, the lens material is cured by ultraviolet curing or heat curing according to the lens material. In step S4, the polymerization is completed while paying attention to the volume variation accompanying the polymerization. A product solidified by polymerization corresponds to the lens blank LB.

  In step S5, the lens matrix 5 is released from the lens blank LB. In the lens blank LB separated from the lens matrix 5, internal strain generated during polymerization may remain. Therefore, in step S6, the lens blank LB is annealed to remove internal strain. In step S7, the lens blank LB is subjected to shape processing according to the wearer's prescription by cutting and polishing. Further, a finished spectacle lens can be obtained by performing an inspection or the like.

  Next, a method for cutting and polishing the lens blank LB will be described. Here, after describing the overall flow with reference to FIG. 5, each step will be described with reference to FIGS. 6 to 9. FIG. 5 is a flowchart showing a method for cutting and polishing the lens blank LB.

  In the present embodiment, after the first surface 1 is cut and polished, the second surface 2 is cut and polished. In step S11, the second surface 2 of the lens blank LB and the fixing jig are fixed by bonding. In step S12, the first surface 1 is cut and polished while supporting the fixing jig, and then in step S13, the second surface 2 and Separate the fixture. Next, in step S14, the first surface 1 of the lens blank LB and the fixing jig are fixed by bonding. In step S15, the second surface 2 is cut and polished while supporting the fixing jig, and then in step S16, the first surface 1 is fixed. The surface 1 and the fixing jig are separated.

  FIG. 6 is a process diagram showing a process (step S11) of fixing the second surface 2 of the lens blank LB to the fixing jig. In order to fix the 2nd surface 2 and a fixing jig, as shown to FIG. 6 (A), the blocker 10 (mounting base) provided with the hole 10a is prepared. In the vicinity of the upper surface of the blocker 10, the inner wall of the hole 10a is stepped, and the inner diameter of the hole 10a changes stepwise. As shown in FIG. 6B, a fixing jig 11 can be fitted into a portion of the hole 10a having a small inner diameter. The fixing jig 11 is a so-called Yatoi or the like, and is a cylindrical member. Moreover, the blocker ring 12 can be attached to a part with a large internal diameter among the hole parts 10a. The blocker ring 12 is an annular member, and the blocker ring 12 is positioned with the blocker 10 when the outer wall of the blocker ring 12 contacts the inner wall of the hole 10a. In a state in which the blocker ring 12 is attached to the blocker 10, the opening diameter of the hole 10 a is substantially the inner diameter of the blocker ring 12. That is, the blocker ring 12 is an adjuster that adjusts the opening diameter of the hole 10a. As the blocker ring 12, a plurality of types having different inner diameters are prepared and selected according to the size of the lens blank LB. Further, depending on the size of the lens blank LB, the blocker ring 12 may not be used. The blocker ring 12 may be attached to the blocker 10 before the fixing jig 11.

  After attaching the fixing jig 11 to the blocker 10, as shown in FIG. 6D, the lens blank LB is arranged with the second surface 2 facing the fixing jig 11. The lens blank LB is placed so that the convex portion 3 and the blocker ring 12 are in contact with each other. Note that a film member may be provided on the surface (here, the second surface 2) fixed to the fixing jig 11 in the lens blank LB. As the film member, one that protects the surface of the lens blank LB, one that enhances adhesion to an adhesive such as an alloy, one that easily peels when the adhesive such as an alloy is removed, and the like are used.

  When the lens blank LB is arranged in this way, the space SP2 between the second surface 2 of the lens blank LB and the fixing jig 11 is partitioned from the outside. Since the convex portion 3 of the lens blank LB is convex toward the fixing jig 11, the convex portion 3 is arranged so as to protrude downward from the blocker ring 12. In such a state, as shown in FIG. 6E, a liquid adhesive 13 such as an alloy (low melting point alloy) is injected (filled) into the space SP2. When the temperature of the alloy becomes lower than the melting point and is cured, the lens blank LB and the fixing jig 11 are fixed through the solidified alloy.

  By the way, when the convex part is not provided in the 2nd surface, since the 2nd surface is a concave surface and is arrange | positioned above a block ring, it is difficult to spread a liquid adhesive material to a 2nd surface. Become. Further, since the second surface is a concave surface, bubbles easily remain here.

  In the lens blank LB according to the present embodiment, since the convex portion 3 protrudes toward the fixing jig 11 rather than the blocker ring 12, an adhesive is applied to a region of the second surface 2 facing the space SP2. 13 tends to spread. Further, since the gas in the space SP2 can easily escape toward the outside of the convex portion 3, the remaining of bubbles and the like are suppressed. As a result, the lens blank LB and the fixing jig 11 can be stably fixed.

  Here, the larger the curvature of the convex portion 3 (the smaller the radius of curvature), the wider the contact area between the convex portion 3 and the adhesive 13 and the higher the adhesive force between the lens blank LB and the fixing jig 11. Further, as the height of the vertex of the convex portion 3 is increased, the contact area between the convex portion 3 and the adhesive 13 is increased. For example, when the vertex of the convex portion 3 is made higher than the edge 2E of the second surface 2, a lens blank is obtained. The adhesive force between the LB and the fixing jig 11 is increased. Further, as the diameter φ2 of the convex portion 3 with respect to the diameter φ1 of the second surface 2 in a plan view of the second surface 2 is increased, the contact area between the convex portion 3 and the adhesive 13 is increased, and the lens blank LB The adhesive force with the fixing jig 11 is increased.

  FIG. 7 is a diagram showing a step of cutting and polishing the first surface 1 of the lens blank LB (step S12). When processing the first surface 1, the second surface 2 is fixed to the support 15. The support 15 includes a fixing jig 11 and an adhesive 13 (alloy). The processing device 16 includes a processing machine 17 and a rotation mechanism 18. When performing the cutting process, the processing machine 17 is a lathe mechanism or the like, and when performing the polishing process, the processing machine 17 is a support mechanism or the like that supports the polishing member.

  One end of the fixing jig 11 in the axial direction is fixed to the second surface 2 of the lens blank LB via an adhesive 13. The other end of the fixing jig 11 in the axial direction is detachably fixed to the rotation mechanism 18. The rotation mechanism 18 is provided so as to be rotatable around a predetermined rotation axis. The fixing jig 11 is attached to the rotation mechanism 18 so that the center axis thereof is coaxial with the rotation axis of the rotation mechanism 18. The rotation mechanism 18 is rotated by torque supplied from a drive source such as a motor (not shown).

  The lens blank LB is supported by the support 15 when the cutting process is performed, and is rotated by the rotation mechanism 18. The processing machine 17 performs cutting (generation) on the rotating lens blank LB. In this cutting process, for example, cutting is performed while adjusting the power, progressive focus, aspherical state, and the like.

  Further, the lens blank LB is supported by the support 15 when the polishing process is performed, similarly to the cutting process. A polishing member is disposed on the first surface 1 of the lens blank LB. The polishing member is formed in a sponge shape, for example, and is provided so as to be deformable by external pressure. For example, the polishing member is disposed so as to cover the entire area of the first surface 1. When the rotating mechanism 18 rotates while the polishing member is in contact with the first surface 1, the lens blank LB rotates with respect to the polishing member together with the rotating mechanism 18. When the lens blank LB rotates with the polishing member being pressed, the lens blank LB is polished by friction with the polishing member.

  The rotation speed of the rotation mechanism 18 is set according to, for example, the material and shape of the polishing member, the range in which the polishing member covers the first surface 1, and the like. The rotation speed of the rotation mechanism 18 is set, for example, in the range of 100 rpm to 1000 rpm, but can be changed as appropriate.

  In the cutting and polishing processes as described above, the lens blank LB has the second surface 2 provided with the convex portions 3 stably fixed to the fixing jig 11, so that the occurrence of dropping or the like is suppressed. . The lens blank LB is removed from the fixing jig 11 by melting the alloy after the cutting process and the polishing process are finished (step S13).

  Next, the process of cutting and polishing the second surface 2 of the lens blank LB will be described. FIG. 8 is a process diagram showing a process (step S14) of fixing the first surface 1 of the lens blank LB to the fixing jig. The first surface 1 and the fixing jig can be fixed in the same manner as the second surface 2 and the fixing jig. That is, the blocker 10 is prepared as shown in FIG. 8A, and the fixing jig 11 is fitted into the hole 10a of the blocker 10 as shown in FIG. 8B.

  And the blocker ring 20 is attached to the blocker 10 as shown in FIG.8 (C). By the way, the second surface 2 of the lens blank LB is partly a convex surface 2a, whereas the first surface 1 is a convex surface throughout. That is, the diameter of the convex surface (the entire area of the first surface 1) on the first surface 1 is larger than the diameter of the convex surface 2 a on the second surface 2. Therefore, a blocker ring 20 having a larger inner diameter than the blocker ring 12 (see FIG. 6C) when the second surface 2 is fixed to the fixing jig 11 can also be used.

  After the fixing jig 11 and the blocker ring 20 are attached to the blocker 10 as described above, the lens blank LB is placed on the blocker 10 and the first surface 1 is directed to the fixing jig 11 as shown in FIG. Arrange. The lens blank LB is disposed on the blocker in contact with the blocker ring 20 or via a film member.

  When the lens blank LB is arranged in this way, the space SP2 between the second surface 2 of the lens blank LB and the fixing jig 11 is partitioned from the outside. Since the convex portion 3 of the lens blank LB is convex toward the fixing jig 11, the convex portion 3 is arranged so as to protrude downward from the blocker ring 12. In this state, as shown in FIG. 6E, a liquid adhesive 13 such as an alloy is injected (filled) into the space SP2. Since the first surface 1 of the lens blank LB is convex toward the fixing jig 11, an alloy can be spread between the first surface 1 and the fixing jig 11. When the alloy temperature becomes lower than the melting point and hardens, the lens blank LB and the fixing jig 11 are stably fixed through the solidified alloy.

  In addition, when fixing the 1st surface 1 and the fixing jig 11, if the blocker ring 20 with an internal diameter larger than the blocker ring 12 is used, the internal diameter of the hole 10a will become large substantially. As a result, the contact area between the adhesive 13 and the first surface 1 is increased, and the adhesive force between the first surface 1 and the fixing jig 11 can be increased.

  FIG. 9 is a diagram showing a step (step S15) of cutting and polishing the second surface 2 of the lens blank LB. When processing the first surface 1, the second surface 2 is fixed to the support 15. The support 15 and the processing device 16 are the same as when processing the first surface 1. One end of the fixing jig 11 in the axial direction is fixed to the first surface 1 of the lens blank LB via an adhesive 13. The other end of the fixing jig 11 in the axial direction is detachably fixed to the rotation mechanism 18. The lens blank LB is supported by the support 15 when the cutting process is performed, and is rotated by the rotation mechanism 18. The processing machine 17 performs cutting (generation) on the rotating lens blank LB.

  In this cutting process, the convex portion 3 is removed and, for example, the entire second surface 2 is cut into a concave surface. In this cutting process, cutting is performed while adjusting the power, progressive focus, aspherical state, and the like.

  Here, the smaller the curvature of the convex portion 3, the smaller the amount of cutting for making the second surface 2 a concave surface, and the processing time and cost can be reduced. Moreover, the amount of cutting for making the 2nd surface 2 into a concave-shaped surface decreases, so that the height of the vertex of the convex part 3 is reduced, and the time and cost of a process can be reduced. In addition, as the diameter of the convex portion 3 with respect to the diameter of the second surface 2 in a plan view of the second surface 2 is reduced, the amount of cutting for making the second surface 2 a concave surface decreases. Processing time and cost can be reduced.

  Then, similarly to the processing of the first surface 1, the second surface 2 is polished. The lens blank LB is removed from the fixing jig 11 by, for example, melting the alloy after the cutting process and polishing process on the second surface 2 are completed (step S16).

  The lens blank LB according to the present embodiment as described above has the convex first surface 1 and the second surface 2 that is disposed opposite to the first surface 1 and includes the convex surface. It can be stably fixed to the tool. In addition, the 2nd surface 2 and the fixing jig 11 can be fixed using the same member as the time of fixing the 1st surface 1 and the fixing jig 11, for example, the blocker 10. In other words, it is not necessary to separately prepare a member for fixing the second surface 2 and the fixing jig 11, and the cost of the member required for the member used for fixing can be reduced.

  In addition, the lens matrix 5 according to the present embodiment includes a first member 6 having a concave surface and a second member having a concave surface disposed to face the concave surface of the first member 6. 7 and a third member 8 that partitions the space between the first member and the second member from the outside. Therefore, it is possible to provide the lens blank LB that can be stably fixed to the fixing jig.

  In addition, the method for manufacturing the lens blank LB according to the present embodiment includes filling the space SP1 partitioned by the third member 8 of the lens matrix 5 with the lens material and curing the lens material. . Therefore, it is possible to provide the lens blank LB that can be stably fixed to the fixing jig.

  The spectacle lens manufacturing method according to the present embodiment manufactures the lens blank LB and fixes the convex surface 2 a of the second surface 2 of the lens blank LB to the fixing jig 11 via the adhesive 13. In addition, the first surface 1 is polished by supporting the fixing surface 11 a fixed to the convex surface 2 a of the second surface 2, and the convex surface 2 a of the polished first surface 1. Is fixed to the fixing jig 11 via the adhesive 13, and the second surface 2 is polished while supporting the fixing jig 11 fixed to the convex surface 2a of the first surface 1. ,including. Therefore, since the lens blank LB can be stably supported and each of the first surface 1 and the second surface 2 can be polished, a spectacle lens suitable for the wearer can be provided.

  Next, a modified example of the lens blank LB will be described. FIG. 10 is a diagram illustrating a lens blank LB according to a modification. In the modified example, elements corresponding to the above-described embodiment are denoted by the same reference numerals as in the embodiment, and the description thereof is simplified or omitted.

  A lens blank LB shown in FIG. 10A includes a first portion 25 including the first surface 1 and a second portion 26 including the convex surface 2 a of the second surface 2. The second portion 26 is formed separately from the first portion 25 and is joined to the first portion 25 by adhesion or the like. The material of the second part 26 may be the same as or different from that of the first part 25.

  The lens blank LB according to this modification can also be manufactured without using the lens matrix 5 shown in FIG. As described above, the lens blank LB includes forming the convex first surface 1 and forming the second surface 2 that is disposed opposite to the first surface 1 and includes the convex surface 2a. It may be manufactured by a manufacturing method. In addition, when the second surface 2 of the lens blank LB according to this modification is cut and polished, if the second portion 26 can be peeled from the first portion 25, the second surface 2 side is removed after the second portion 26 is peeled off. Cutting and polishing may be performed.

  In the lens blank LB shown in FIG. 10B, the convex portion 3 has a cylindrical shape. The upper surface 3b of the convex part 3 is planar. Thus, the second surface 2 of the lens blank LB may include a planar surface. The second surface 2 may include a curved surface and a flat surface. In addition, the convex part 3 may be a rectangular parallelepiped shape.

  In the lens blank LB shown in FIG. 10C, the convex portion 3 has a conical shape. Thus, the second surface 2 of the lens blank LB may include a curved surface other than a spherical surface or a parabolic surface. Moreover, the convex part 3 may have a pyramid shape such as a quadrangular pyramid.

  In the lens blank LB shown in FIG. 10D, the convex portion 3 includes a cylindrical third portion 27 and a hemispherical fourth portion 28 provided on the third portion 27. Thus, the convex surface 2a of the second surface 2 may have a position where the inclination changes discontinuously.

  In the lens blank LB shown in FIG. 10E, the convex surface 2a of the second surface 2 is smoothly connected to the concave surface 2b. That is, the inclination of the second surface 2 continuously changes between the convex surface 2a and the concave surface 2b. In such a case, the boundary between the convex surface 2a and the concave surface 2b is a line connecting positions (inflection points) where the inclination becomes zero.

  FIG. 10F is a plan view of the second surface 2 of the lens blank LB. In the lens blank LB, the outer shape of the convex portion 3 when viewed in plan is a rectangular shape. Thus, the planar shape of the convex portion 3 does not have to be a rotationally symmetric shape, and is a triangle or a polygon having five or more corners, a shape obtained by rounding corners of a polygon, a contour including a straight line and a curve. Any of the enclosed shapes may be used.

  The technical scope of the present invention is not limited to the above-described embodiment or modification. For example, one or more of the requirements described in the above embodiments or modifications may be omitted. In addition, the requirements described in the above embodiments or modifications can be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 1st surface, 2nd surface, 2a Convex surface, 2b Concave surface, 5 Lens matrix, 6 1st member, 6a Convex surface, 2nd member, 7b Concave surface, 7c Convex Shape surface, 8 third member, GL spectacle lens

Claims (8)

A first surface of convex shape, disposed opposite the first surface, a second surface including a convex or planar surfaces, the surfaces of the convex shape of the second surface of the lens blank with an adhesive Fixing with a fixing jig via
Supporting the fixing jig fixed to the convex or planar surface of the second surface, and processing the shape of the first surface;
Fixing the processed convex surface of the first surface to the fixing jig via an adhesive;
A method for manufacturing a spectacle lens, comprising: supporting the fixing jig fixed to the convex surface of the first surface, and processing the shape of the second surface. The method for manufacturing a spectacle lens according to claim 1, wherein the convex or planar surface of the second surface is removed when the shape of the second surface is processed . The method for manufacturing a spectacle lens according to claim 1 or 2, wherein the shape of the second surface is processed so that the entire area of the second surface is a concave surface . The first surface or the second surface is fixed to the fixing jig.
Fitting the fixing jig into the hole of the mounting base;
Placing the first surface or the second surface of the lens blank in contact with a blocker ring attached to a hole of the mounting base and facing the fixing jig;
Filling the adhesive between the fixing jig and the first surface or the second surface of the hole portion, according to any one of claims 1 to 3. A method of manufacturing a spectacle lens. The spectacle lens manufacturing method according to claim 4, wherein the blocker ring is selected from a plurality of types having different inner diameters according to the size of the lens blank . The method for manufacturing a spectacle lens according to any one of claims 1 to 5, wherein a film member is provided on the first surface or the second surface fixed to the fixing jig . The manufacturing method of the spectacle lens as described in any one of Claims 1-6 including manufacturing the said lens blank . The production of the lens blank is
A first member having a concave surface; a second member having a concave or planar surface disposed opposite to the concave surface of the first member; the first member and the second member; Filling the lens material into the space partitioned by the third member of the lens matrix, and a third member that partitions the space between and the outside,
The method of manufacturing a spectacle lens according to claim 7, comprising curing the lens material .

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