JP5470078B2 - Manufacturing method of spectacle lens - Google Patents

Description

  The present invention relates to a method for manufacturing a spectacle lens.

  The spectacle lens is formed by processing a semi-finished lens called a semi-finished lens, for example. In the processing step of the semi-finished lens, for example, the semi-finished lens is rotated while holding the convex surface by the holding member, and is cut into a shape that approximates the shape of the spectacle frame, such as a circle, an ellipse, or a bowl. The following patent document discloses an example of a technique related to a method for manufacturing a spectacle lens.

  The spectacle lens obtained by the above processing is subjected to a polishing process as a finish. In this polishing step, polishing is performed while rotating the spectacle lens while holding the spectacle lens by the holding member. From the semi-finished lens processing step to the spectacle lens polishing step, for example, the convex surface side of the semi-finished lens is held by the holding member, and the processed spectacle lens is continuously polished. .

  Conventionally, from the viewpoint of simplicity of cutting, for example, the spectacle lens range is set so that the optical center of the spectacle lens is positioned at the geometric center of the semi-finished lens. However, in this case, the spectacle lens range is arranged in a state of being deviated with respect to the geometric center of the semi-finished lens, so that the unused portion of the semi-finished lens increases and there is a lot of waste during processing. In addition, when the semi-finished lens is formed large, the curvature of the convex surface increases accordingly, and thus the spectacle lens may be formed thick and heavy.

  On the other hand, in recent years, a technique for reducing the size of the semi-finished lens has been proposed from the viewpoint of efficient use of the semi-finished lens and reduction in thickness and weight of the spectacle lens. For example, there is a method of setting the spectacle lens range in the center of the semi-finished lens. In this case, since the range of the spectacle lens is arranged in a balanced manner in the radial direction with respect to the geometric center of the semi-finished lens, the diameter of the semi-finished lens can be set as small as possible. For example, a semi-finished lens can be formed with a size obtained by adding a margin at the time of processing to the spectacle lens range. When such a semi-finished lens is cut, the semi-finished lens is rotated with the position that is the optical center of the spectacle lens coincided with the rotation center, as in the prior art.

Japanese Patent No. 3845954

  However, in the above method, the processed spectacle lens is held in a state where the optical center of the spectacle lens and the rotation center of the holding member coincide with each other. That is, the geometric center of the spectacle lens is deviated from the rotation center of the holding member. If the spectacle lens is rotated in this holding state, the spectacle lens rotates eccentrically, and the balance of the rotation of the spectacle lens during polishing becomes poor. For this reason, there is a possibility that the peripheral portion is not sufficiently polished compared to the rotation center of the spectacle lens and its vicinity.

  In view of the circumstances as described above, an object of the present invention is to provide a method for manufacturing a spectacle lens capable of improving the finishing accuracy.

  According to an aspect of the present invention, a processing step of processing a semi-finished lens to form an eyeglass lens body, and polishing the lens surface while rotating the eyeglass lens body around the geometric center of the lens surface of the eyeglass lens body A method for manufacturing a spectacle lens is provided.

  According to the present invention, the finishing accuracy of the prescription surface can be improved.

The top view which shows the structure of the spectacle lens which concerns on embodiment of this invention. The figure which shows the structure along the AA cross section in FIG. The top view which shows the structure of a semi finish lens. The figure which shows the structure along the BB cross section in FIG. Process drawing which shows the manufacturing process of a semi-finished lens. The process drawing. Process drawing which shows the manufacture process (processing process) of an eyeglass lens. Process drawing which shows the manufacture process (polishing process) of an eyeglass lens. Process drawing which shows the manufacture process (polishing process) of an eyeglass lens. Process drawing which shows the manufacture process (polishing process) of an eyeglass lens. Process drawing which shows the other manufacturing process of an eyeglass lens.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a spectacle lens according to the present embodiment. FIG. 2 is a diagram showing a shape along the AA cross section of FIG.

  As shown in FIGS. 1 and 2, the spectacle lens GL is a lens formed in a shape that approximates the shape of, for example, a predetermined spectacle frame F (see FIG. 1) in plan view. In the present embodiment, for example, a case where a spectacle lens GL formed in a bowl shape is used will be described. Of course, a spectacle lens GL formed in another shape (for example, a circle, an ellipse, or a rhombus) may be used.

  The spectacle lens GL includes a left-eye lens and a right-eye lens, and has the same configuration except that it is bilaterally symmetric. In the present embodiment, as the spectacle lens GL, for example, a spectacle lens worn on the left eye of the wearer will be described as an example. In FIGS. 1 and 2, for example, the right side in the figure is the nose side, and the left side in the figure is the ear side. The shape of the eyeglass lens GL shown in FIG. 1 is merely an example, and other shapes may be used.

  The spectacle lens GL is made of, for example, plastic or glass. The spectacle lens GL has, for example, a convex lens surface La formed on a convex surface and a concave lens surface Lb formed on a concave surface, for example. The convex lens surface La is formed in, for example, a progressive surface, a spherical surface, an aspheric surface, or the like. The concave lens surface Lb is formed, for example, in a shape according to the prescription data of the wearer.

  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. The eye point is a line-of-sight position on the lens when the wearer horizontally views the eye point. A geometric center Q is set for the spectacle lens GL. The geometric center Q is set, for example, at the center position in the left-right direction in the wearing state of the convex lens surface La and the concave lens surface Lb of the spectacle lens GL.

FIG. 3 is a diagram illustrating a configuration of the semi-finished lens according to the present embodiment. FIG. 4 is a diagram showing a shape along the BB cross section in FIG. 3.
As shown in FIG. 3, the semi-finished lens 1 is a lens formed in a circular shape in plan view. By processing the semi-finished lens 1, the spectacle lens GL is manufactured. Therefore, the semi-finished lens 1 is formed of the same material as the spectacle lens GL, for example, plastic or glass. The semi-finished lens 1 has a center O as a geometric center. For example, the geometric center O of the semi-finished lens 1 is provided at a position shifted from the position that becomes the optical center P of the spectacle lens GL.

  In the configuration of the present embodiment, as shown in FIGS. 3 and 4, the range that becomes the spectacle lens GL is set at the substantially central portion of the semi-finished lens 1. For this reason, the range of the spectacle lens GL is arranged with a good balance in the radial direction with respect to the geometric center O of the semi-finished lens 1.

  As shown in FIG. 4, the semi-finished lens 1 has a convex surface 2 and a concave surface 3. The convex surface 2 is a surface formed in advance on a progressive surface, a spherical surface or an aspherical surface, for example, according to the addition. When the spectacle lens GL is manufactured from the semi-finished lens 1, a part of the convex surface 2 becomes the convex lens surface La of the spectacle lens GL. The semi-finished lens 1 may have a configuration in which, for example, a film member FL (see FIG. 7 or the like) is attached to the convex surface 2. With this configuration, the convex surface 2 is protected. On the other hand, the concave surface 3 is a surface processed according to the prescription data of the wearer when the spectacle lens GL is manufactured. The concave surface 3 is finished in a smooth state, for example.

  Next, a manufacturing process for manufacturing the spectacle lens GL shown in FIGS. 1 and 2 by forming the semi-finished lens 1 shown in FIGS. 3 and 4 and processing the semi-finished lens 1 will be described.

  When forming the semi-finished lens 1, first, as shown in FIG. 5A, an upper mold 71 and a lower mold 72 formed using, for example, glass or the like are fixed with a gasket 70. The upper die 71 has, for example, a convex portion 71a corresponding to the concave surface 3 of the semifinished lens 1, and the lower die 72 has a concave portion 72a corresponding to, for example, the convex surface 2 of the semifinished lens 1.

  Next, as shown in FIG. 5B, the monomer M is injected into a space surrounded by the gasket 70, the upper mold 71 and the lower mold 72. The monomer M includes a thermopolymerizable resin such as diethylene glycol bisallyl carbonate. Thereafter, as shown in FIG. 5C, the monomer M injected into the space is placed in the heating device 75 together with the gasket 70, and the monomer M is polymerized and cured by heat treatment.

  After the monomer M is cured, the lens body 10 is formed by removing the gasket 70, the upper mold 71, and the lower mold 72 as shown in FIG. From this state, as shown in FIG. 6B, the lens body 10 is disposed in the heating device 76, and the lens body 10 is annealed at a predetermined heating temperature. After annealing, for example, inspection is performed, and the semi-finished lens 1 having the convex surface 2 and the concave surface 3 is generated as shown in FIG.

Next, the process proceeds to a process (processing process) for processing the semi-finished lens 1.
In the processing step, first, as shown in FIG. 7A, after the film member FL is attached to the convex surface 2 of the semifinished lens 1, the semifinished lens 1 is fixed to the support portion 12 of the support 4. At this time, for example, the position that is the optical center P of the spectacle lens GL in the semi-finished lens 1 is made to coincide with the rotation center R of the support portion 12. In this case, the semi-finished lens 1 is attached with a slight inclination with respect to the support portion 12. The support 12 fixed to the semi-finished lens 1 is attached to, for example, a grinding apparatus (not shown) (for example, a lathe mechanism).

  From this state, the semi-finished lens 1 is ground (generated) while the support 12 (semi-finished lens 1) is rotated about the rotation center R as a central axis. In this grinding process, the semi-finished lens 1 is ground by, for example, a lathe process, so that, for example, a bowl-shaped eyeglass lens body GB is formed as shown in FIG. When the semi-finished lens 1 is cut, for example, grinding is performed while adjusting the power, progressive focus, aspherical state, and the like.

  The spectacle lens main body GB immediately after the cutting process may have, for example, minute concaves and convexes formed on the concave lens surface Lb that is a processed surface subjected to a lathe process. On the other hand, as a finish of the concave lens surface Lb, a step (polishing step) for polishing the concave lens surface Lb is performed. When performing the polishing process, first, the support 4 that holds the spectacle lens main body GB is attached to the rotation mechanism 5.

FIG. 8 is a side sectional view showing a state in which the support 4 is attached to the rotation mechanism 5. FIG. 9 is a plan view of the same state.
As illustrated in FIGS. 8 and 9, the rotation mechanism 5 includes, for example, a rotary table 50, a shaft member 51, and a guide member 52. The rotary table 50 has a fixing mechanism (not shown) that detachably fixes the connecting portion 13, for example. The shaft member 51 is connected to a drive source such as a motor (not shown), and transmits the rotational force of the motor to the rotary table 50. The guide member 52 is disposed on the rotary table 50 and guides the connecting portion 13.

  In this embodiment, when attaching the support tool 4 to the rotation mechanism 5, first, the connecting portion 13 is attached to the guide member 52, and the position of the support tool 4 is adjusted along the extending direction of the guide member 52. At this time, the position of the support 4 is adjusted so that the rotation center R ′ of the turntable 50 (shaft member 51) and the geometric center Q of the spectacle lens body GB coincide. After adjusting the position of the support tool 4, the connecting portion 13 is fixed to the rotary table 50 using, for example, a fixing mechanism (not shown).

  Next, for example, as illustrated in FIG. 10, the polishing member PF is disposed on the concave lens surface Lb of the spectacle lens body GB. In the present embodiment, the polishing member PF is formed in a sponge shape, for example, and is provided so as to be deformable by external pressure. The polishing member PF is formed so as to cover the entire surface of the concave lens surface Lb, for example.

  After disposing the polishing member PF, the rotary table 50 is rotated about the rotation center R ′ as the central axis. Here, for example, the rotary table 50 is appropriately rotated in the range of 100 rpm to 1000 rpm. This rotational speed is set according to, for example, the material and shape of the polishing member PF, the covering range of the concave lens surface Lb, and the like. Thus, by rotating the rotary table 50 about the rotation center R ′, the spectacle lens main body GB rotates about the geometric center Q.

  After the spectacle lens body GB is rotated, the polishing member PF is pressed toward the concave lens surface Lb using the jig 60 of the polishing mechanism 6. By this operation, for example, a predetermined frictional force is generated between the concave lens surface Lb and the polishing member PF, and the concave lens surface Lb is polished by the frictional force. Further, in a portion other than the portion pressed by the jig 60, a frictional force is generated between the concave lens surface Lb and the polishing member PF, so that the entire concave lens surface Lb is polished.

  In the present embodiment, the polishing mechanism 6 is provided with a drive mechanism (not shown), and the above operation is performed while the jig 60 is appropriately moved between the movable ranges L1 by the drive mechanism. The moving speed of the jig 60 at this time can be set, for example, in a range of 100 to 2000 mm / min. This moving speed is set according to, for example, the material and shape of the polishing member PF, the covering range of the concave lens surface Lb, and the like, similar to the rotational speed of the turntable 50.

  Further, the movable range L1 of the jig 60 is set, for example, in a range from one end portion (for example, the left end portion in FIG. 10) in the left-right direction of the concave lens surface Lb to the geometric center Q of the concave lens surface Lb. Accordingly, the jig 60 can move in a half region of the polishing member PF disposed on the concave lens surface Lb.

  Since the polishing process is performed while rotating the spectacle lens body GB and the polishing member PF, by setting the movable range of the jig 60 as described above, substantially the entire region of the polishing member PF is pressed by the jig 60. The Rukoto. Therefore, pressure is uniformly applied to the polishing member PF, and the concave lens surface Lb is polished more uniformly.

  Note that another jig (for example, a jig having the same configuration as the jig 60) may be disposed in the non-movable range L2 of the jig 60, and polishing may be performed using two jigs. The eyeglass lens GL can be obtained through the above steps. As the rotating mechanism 5 and the polishing mechanism 6, for example, an Oscar-type polishing apparatus or the like can be used.

  As described above, according to the present embodiment, the processing step of processing the semi-finished lens 1 to form the spectacle lens main body GB, and the spectacle lens main body with the geometric center Q of the concave lens surface Lb of the spectacle lens main body GB as the rotation center. And a polishing step of polishing the concave lens surface Lb while rotating the GB, so that the entire concave lens surface Lb is uniformly polished. Thereby, since the fall of the polishability of the part away from the rotation center among the concave lens surface Lb can be prevented, the finishing precision of the concave lens surface Lb can be improved.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, when the polishing process is performed on the spectacle lens GL that corrects astigmatism, as shown in FIG. The spectacle lens GB is preferably arranged so that the direction of the astigmatism axis S of GB and the direction of the rotation axis R ′ of the turntable 50 are parallel to each other. Thereby, since the eccentric longitudinal direction of the spectacle lens main body GB and the rotation direction of the spectacle lens main body GB can be matched, the finishing process can be performed with higher accuracy.

  In the above embodiment, the polishing member PF configured to cover the entire concave lens surface Lb is used. However, the present invention is not limited to this. For example, a partial region (predetermined region) of the concave lens surface Lb is used. The polishing member PF configured to cover the surface may be used. In this case, for example, it is preferable that the polishing member PF is fixed to the jig 60 and the polishing member PF is moved as the jig 60 moves. Further, the polishing member PF may be provided so as to protrude from the concave lens surface Lb.

  In the above embodiment, the case where the rotation mechanism of the support 4 is different between the processing step and the polishing step has been described as an example. However, the present invention is not limited to this. For example, the processing step and the polishing step are the same. The support 4 may be rotated by a rotation mechanism (for example, the rotation mechanism 5 described above). In this case, it is only necessary to adjust the position of the support 4 during the transition from the processing step to the polishing step, so that the time can be shortened.

  GL ... Spectacle lens GB ... Spectacle lens body La ... Convex lens surface Lb ... Concave lens surface O ... Geometric center of semi-finished lens P ... Optical center of spectacle lens Q ... Geometric center of spectacle lens FL ... Film member PF ... Polishing member S ... Astigmatism Axis 1 ... Semi-finished lens 4 ... Supporting tool 5 ... Rotating mechanism 6 ... Polishing mechanism 12 ... Supporting part 13 ... Connection part 50 ... Rotating table 51 ... Shaft member 52 ... Guide member 60 ... Jig

Claims (8)

A processing step of processing a semi-finished lens to form a spectacle lens body;
And a polishing step of polishing the lens surface while rotating the spectacle lens body about the geometric center of the lens surface of the spectacle lens body. The method for manufacturing a spectacle lens according to claim 1, wherein the geometric center is a center position in the left-right direction when the lens surface is worn. The method for manufacturing a spectacle lens according to claim 1, wherein the processing step includes processing the concave surface provided in the semi-finished lens to form the lens surface. The polishing step covers at least a part of one lens surface of the spectacle lens with a polishing member, and polishes the spectacle lens body by moving the jig while pressing the jig against the polishing member. The method for manufacturing a spectacle lens according to claim 3. The spectacle lens manufacturing method according to claim 4, wherein the polishing step includes covering the entire surface of the one lens surface with the polishing member. The processing step includes processing while rotating the semi-finished lens in a state where a part of the convex surface provided on the semi-finished lens is held by a holding member,
The polishing step includes adjusting a position of the holding member so that the geometric center becomes the rotation center while maintaining a holding position by the holding member. The manufacturing method of the spectacle lens of description. The processing step includes forming the spectacle lens body so as to include an astigmatic axis,
The spectacle lens according to any one of claims 1 to 6, wherein the polishing step includes rotating the spectacle lens main body so that a rotation axis of the spectacle lens main body coincides with the astigmatic axis. Production method. The method for manufacturing a spectacle lens according to any one of claims 1 to 7, wherein a semi-finish lens having an optical center shifted from a geometric center is used as the semi-finish lens.

Images