JP2013180372A - Lens holder and method of manufacturing lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens holder and a method of manufacturing lens, capable of simply and quickly forming a shape in conformity with an optical surface of the lens while reducing a use amount of a material of the lens holder.SOLUTION: A lens holder comprises a holding member for use in holding a lens. The holding member has plasticity in a predetermined condition while maintaining a predetermined shape by its own strength and can freely be deformed in conformity with a shape of an optical surface of the lens. In contrast the plasticity disappears in another predetermined condition.

Description

  The present invention relates to a lens holder and a method for manufacturing a lens.

  In recent years, a plastic lens using a resin material instead of a glass lens is often used as an optical lens (hereinafter, also simply referred to as “lens”). The reason is that the plastic lens is lighter than the glass lens, has advantages such as being hard to break and easy to process. This plastic lens is widely used in the optical field, but is particularly used as a spectacle lens because of the above advantages.

  Conventionally, in processing of a resin material constituting a plastic lens for spectacles, curve generation processing (hereinafter referred to as CG processing) for performing spherical processing, toric surface processing, and free-form surface processing as a cutting and grinding method. Has been done. The process in which this processing is performed is also called a roughing process.

  In this CG processing, a diamond tool is relatively arranged at a position where a desired shape can be created with respect to a resin material as a workpiece, and a spherical surface, a toric, and a free-form surface are moved while relatively moving both the tool and the resin material. It is a method of creating a shape.

  This CG processed resin material is mechanically polished using a polyurethane polishing pad, non-woven polishing pad, and free abrasive grains, and then subjected to polishing processing (for example, rough polishing or finish polishing) on the plastic lens, and the optical surface To arrange. Finally, a desired optical surface is formed on the plastic lens to form a finished lens.

  In the lens cutting process and polishing process, the lens is held by a lens holder and attached to a processing apparatus. Conventionally, the lens holder is composed of Yato and a low melting point alloy (hereinafter also referred to as alloy). A technique related to this configuration is disclosed by the present applicant (see Patent Document 1).

  FIG. 8 shows a lens holder disclosed in Patent Document 1. This lens holder is composed of a Yatoi 2 and an alloy 8, and the lens 5 is attached by a lens block device called a layout blocker manufactured by LOH, which is generally commercially available. In order to attach the lens 5 to the lens holder, a scratch-preventing protective film 9 is attached in advance to the surface of the lens 5 opposite to the surface to be processed (a processed surface such as a convex surface). Next, the yatoy 2 and the blocking ring 7 are fixed to the mounting part 10 of the layout blocker, and the lens 5 is placed on the blocking ring 7 with the convex surface to which the protective film 9 is attached facing down. Thereby, the blocking ring 7 supports the outer peripheral part of the convex surface of the lens 5 by the inner peripheral edge on the upper surface side. Then, the molten alloy 8 is poured into the space surrounded by the lens 5, the yatoy 2, the blocking ring 7, and the mounting portion 10 to solidify the lens 5, thereby fixing the lens 5 to the yatoy 2. After separating the blocking ring 7 from the alloy 8, the lens 5 is mounted on the processing apparatus together with the yatoy 2, and the processing surface is cut or polished.

  As in Patent Document 1, the present applicant has disclosed a technique using a Yatoi and an alloy in addition to a blocking ring (see Patent Documents 2 and 3). Patent Document 2 discloses a technique that enables attachment to various processing apparatuses by configuring a yatoy with a plurality of bases. Patent Document 3 discloses a technique related to an adapter that enables a Yatoi to be attached to various processing apparatuses.

  On the other hand, a technique using a molten thermoplastic resin instead of an alloy is disclosed in addition to a technique using a yatoi and an alloy (see Patent Document 4). Specifically, it is as follows. First, molten thermoplastic resin is injected into the gap between the plastic lens and the frame mold. Alternatively, the lens is brought into contact with the molten thermoplastic resin. And the block material which consists of thermoplastic resins is formed by solidifying this thermoplastic resin. Then, the cutting process is performed while the plastic lens and the block material are integrated.

Japanese Patent No. 4084081 JP 2010-284729 A JP 2010-284761 A Japanese Patent Laid-Open No. 11-198814

  As described above, in recent years, plastic lenses are frequently used as lenses. In particular, the tendency is remarkable in a multifocal lens for spectacles and for both near and far. A multifocal lens is a lens in which a single lens has a different power. For example, the upper side of the lens is a distance portion for viewing a distance, and the lower side is a near portion for viewing a distance. Recently, progressive multifocal lenses in which the lens power continuously changes from the distance portion to the near portion have been used.

  For such a multifocal lens, the lens surface is cut and polished according to necessary conditions such as power and astigmatism angle according to the individual prescription of the user. What is included in each prescription here is no exception for the amount of prism. That is, in the blocking ring 7 referred to in Patent Documents 2 and 3 (“prism ring” as referred to in the present specification), in accordance with the individual prescription of the user, the one formed with an inclination from the horizontal direction, It is necessary to prepare a large number. Moreover, since the shape of the multifocal lens is determined according to the individual prescription, each one has a very complicated shape. Therefore, even if a large number of prism rings are prepared, it is extremely troublesome to calculate the shape of the prism ring having a predetermined prism while reflecting the shape of the multifocal lens.

  In the technique described in Patent Document 4, a block material (a “holding member” in the present specification) is formed by bringing a plastic lens into contact with a molten thermoplastic resin. If this method is used, a prism ring (reference numeral 120 of patent document 4) according to the prescription can be obtained by preparing a frame mold (reference numeral 20 of patent document 4) having a volume that does not overflow the molten thermoplastic resin. ) Is no longer necessary. This is because the block material reflecting the surface shape (prism amount) of the plastic lens can be formed by bringing the plastic lens into contact with the molten thermoplastic resin.

  However, in Patent Document 4, the molten thermoplastic resin is brought into contact with the plastic lens in some form. Then, by solidifying the molten thermoplastic resin, the plastic lens and the thermoplastic resin are joined together, and the plastic lens is fixed to the block material (hereinafter referred to as “blocking fixing the lens to the lens holder” Also called.). First, when the molten thermoplastic resin is solidified, a gap is generated between the solidified thermoplastic resin and the plastic lens due to the difference in thermal expansion coefficient between the plastic lens and the thermoplastic resin. , Blocking may not be successful. In addition, since the thermoplastic resin is in a high temperature state so as to be melted, there is no denying that the plastic lens itself may be denatured when the plastic lens comes into contact with the molten thermoplastic resin. Furthermore, in Patent Document 4, when the plastic lens is detached from the block material (hereinafter, the removal of the lens from the lens holder is also referred to as “deblocking”), heating or dissolution with a solvent is performed. As described in paragraph 0033, the plastic lens itself may be denatured even during this heating or melting.

  In the first place, in Patent Documents 1 to 4, it is necessary to form an alloy or a block material that reflects the surface shape of the lens after it is once melted, whether it is an alloy or a thermoplastic resin. Therefore, a step of injecting a molten material of alloy or block material is required. An increase in the number of processes in the formation of the holder means that it takes extra time when viewed from the whole lens manufacturing process. Moreover, if a defect occurs during the injection process, a holder different from the design is formed. In this case, the lens may be processed differently from the design. As a result, adopting the injection process and finally forming the lens holder may ultimately lead to a decrease in yield.

Further, in Patent Document 4, as described in paragraph 0033, since the thermoplastic resin is heated or dissolved, the block material is considered to be disposable. That is, instead of preparing a large number of prism rings according to the prescription, when manufacturing a lens according to the prescription of each person, it is necessary to dispose of the thermoplastic resin each time. In particular, when a single prism ring is used and the lens has a large prism amount (tilt), a considerable amount of thermoplastic resin is required. In this case, besides the lens, a raw material for the thermoplastic resin must be prepared separately. In addition, since the shape of the lens differs depending on the wearer, it must be prepared every time a lens having a huge variety of shapes is manufactured.
This is no exception for the blocking rings (prism rings) in Patent Documents 1 to 3. After all, since the prism ring must be manufactured according to the individual prescription of the person using the lens, the lens holder is often unnecessary after the lens holder is used. Therefore, although the lens holder must be manufactured every time the lens is manufactured, the lens holder must be discarded after use.
If the above situation continues, it will naturally lead to an increase in waste. As a result, as a matter of course, the cost increases, and despite the recent situation where recycling is recommended, consideration for the environment is poor.
Even if the prism ring is formed of an alloy, when producing a holder for another lens, the alloy must be melted again and a prism ring corresponding to another lens must be designed or produced. Don't be. As a result, it becomes necessary to produce a large number of prism rings.

  An object of the present invention is to provide a lens holder and a lens manufacturing method capable of forming a shape corresponding to the optical surface of the lens simply and quickly while suppressing the amount of the material used for the lens holder.

  The present inventors have studied a method for solving the above-described problems. At that time, the present inventors pay attention to the fact that, among the above-mentioned problems, when forming the lens holder, the material of the lens holder needs to be once melted (a state in which the shape cannot be maintained by itself). did. And the present inventors examined whether the molten state is really necessary in the first place. In addition to that, we studied the technique to solve the above-mentioned problems (especially the necessity of making many prism rings) all at once.

  As a result, in order to take on the role of conventional alloys, thermoplastic resins, and prism rings, the opposite of the nature of the conventional lens holder, as a member of the lens holder, from the stage before blocking, And obtained the knowledge that the one that maintains the predetermined shape is used. In other words, this member is made plastic at the time of blocking, and the shape of the optical surface of the lens can be transferred relatively easily by deforming the member from a predetermined shape according to the optical surface shape of the lens. On the other hand, the inventors have obtained the knowledge that when the lens needs to be held, such as when processing the lens, the lens is held by losing the plasticity.

Aspects of the present invention based on the above findings are as follows.
The first aspect of the present invention is:
A lens holder provided with a holding member for holding a lens,
The holding member has plasticity while maintaining a predetermined shape by itself under predetermined conditions, and can be deformed according to the shape of the optical surface of the lens, while under other predetermined conditions. A lens holder characterized in that the plasticity is lost.
A second aspect of the present invention is the aspect described in the first aspect,
It further has a joining member which joins the holding member and the lens.
A third aspect of the present invention is the aspect described in the second aspect,
The predetermined shape is a shape imitating at least a part of the optical surface of the lens.
A fourth aspect of the present invention is the aspect described in the third aspect,
The holding member is a resin composition having a shape memory property.
According to a fifth aspect of the present invention,
A lens manufacturing method using a lens holder provided with a holding member for holding a lens,
A holding member deformation step for deforming the holding member in accordance with the shape of the lens;
A holding step of holding the lens by the lens holder after the holding member deformation step;
Have
In the holding member deformation step, the holding member has plasticity while maintaining a predetermined shape by itself, and is deformable according to the shape of the optical surface of the lens, while in the holding step, The method of manufacturing a lens, wherein the plasticity is lost.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a lens holder and a lens which can form the shape according to the optical surface of a lens simply and rapidly, suppressing the usage-amount of the raw material of a lens holder can be provided.

It is sectional drawing which shows a mode that a lens is fixed to the lens holder in this embodiment. It is a section schematic diagram of a lens holder in this embodiment, (a) is a section schematic diagram of a lens holder with a lens holding to a lens which does not have a prism, and (b) is predetermined. It is the cross-sectional schematic of the lens holder with a lens currently hold | maintaining with respect to the lens which has prism amount (prism amount equivalent to inclination-angle (theta) from horizontal). A schematic cross-sectional view of a holding member having a predetermined shape that has been stored in advance by classifying a predetermined shape that has been stored in the shape of the holding member in the present embodiment into several types of prism amounts that are often used in lenses. The holding member reflecting (a) the amount of small prisms, (b) the amount of medium prisms, and (c) the amount of large prisms is shown. It is the cross-sectional schematic which shows the holding method of the lens in this embodiment in order of a process. It is the cross-sectional schematic which shows the removal method of the lens in this embodiment in order of a process. It is the cross-sectional schematic which shows the holding method of the lens in another embodiment in order of a process. It is a section schematic diagram showing the modification of the lens holder in another embodiment, (a) shows the lens holder which matched the holding member to the shape of the convex part of (b), and (b) The lens holder is integrally formed with the member, and the lens (c) is a lens holder attached to the lens so as to cover the outer edge of the lens. It is sectional drawing which shows a mode that a lens is fixed to the conventional lens holder.

[Embodiment 1]
Embodiments of the present invention will be described below. The order will be described in the following order.
1. Lens holder A) Overall configuration of lens holder B) Holding member C) Bonding member D) Others Lens holding method (blocking mechanism)
A) Application process of joining member material (UV curable resin) B) Plasticity development process (heating process)
C) Holding member deformation process D) Joining process (UV irradiation process)
E) Holding process F) Deblocking (desorption process)
G) Shape restoration process of holding member Lens manufacturing method A) Lens selection B) Blocking C) CG processing D) Polishing E) Deblocking F) Others (color dyeing / inspection / ultrasonic cleaning / hard coat processing / multi-coat processing, etc.)
4). Effects of the Embodiments In the present embodiment, a description will be given by taking, as an example, a plastic lens for spectacles among optical lenses. Hereinafter, the plastic lens for eyeglasses is also simply referred to as “lens” for convenience of explanation.
In [Embodiment 2], a case will be described in which the holding member is first deformed according to the optical surface of the lens, and then the material of the joining member is applied.
In [Embodiment 3], the composition of a specific compound of the holding member will be described.
Finally, in [Embodiment 4], other modifications will be described.

<1. Lens holder>
A) Overall Configuration of Lens Holder FIG. 1 is a schematic cross-sectional view showing how the lens 5 is fixed to the lens holder 1 in the present embodiment. Although there are members not shown in FIG. 1, these members may be appropriately installed in the lens holder 1 as in FIG. 8 described above. The members not shown will be described with reference to the reference numerals shown in FIG.

First, the lens holder 1 of the present embodiment includes a holding member 3 that is used to hold the lens 5 and a bonding member 4 that is provided between the holding member 3 and the lens 5.
The lens holder 1 in the present embodiment includes a holding member 3, a joining member 4, and a yatoy 2. For example, the lens 5 is attached by a lens block device called a layout blocker manufactured by LOH, which is generally commercially available. ing. In order to attach the lens 5 to the lens holder 1, a scratch-preventing protective film 9 is attached in advance to the surface of the lens 5 opposite to the surface to be processed (a processed surface such as a convex surface). Next, the yatoy 2 and the holding member 3 are fixed to the mounting portion of the layout blocker with the set screw 6. The bonding member 4 is installed on the holding member 3, and the convex surface of the lens 5 to which a protective film (not shown) is attached is bonded to the holding member 3 by a bonding method described later. In the lens holder 1 with the lens 5, the lens holder 1 supports the outer peripheral portion of the convex surface of the lens 5 by the inner peripheral edge on the upper surface side. Then, the lens holder 1 is mounted on a processing apparatus together with the lens 5, and the processing surface is cut or polished.

Although the details of each member of the lens holder 1 will be described later, the outline is that a bonding member material 4a is applied on the holding member 3, and the lens 5 is pressed onto the bonding member material 4a. The holding member 3 is deformed by the pressing, and the material 4a of the bonding member is cured to form the bonding member 4. Thus, the lens holder 1 having the holding member 3 and the bonding member 4 and holding the lens 5 is formed.
In addition, the lens holder 1 in this embodiment has a configuration that can be attached to and detached from the yatoy 2. As this yatoe 2, a known one may be used. Further, the holding member 3 of the present embodiment uses a material having plasticity when blocking. Therefore, if the plasticity is exhibited even when matching the shape of the yatoy 2, the lens holder 1 of the present embodiment can be attached to and detached from the shape of the known yatoy 2 having any shape. It can be formed. This also means that the lens holder 1 can be attached and detached regardless of the types of lens block devices (for example, manufactured by SATISLOH) and lens processing devices that are generally commercially available.

B) Holding member In the lens holder 1 of this embodiment, the holding member 3 has one big characteristic. The holding member 3 of the present embodiment uses a member that has plasticity while maintaining a predetermined shape by itself under predetermined conditions, and can be deformed in accordance with the shape of the optical surface of the lens 5. . That is, when the shape of the lens holder 1 is deformed in accordance with the shape of the optical surface of the lens 5, the holding member 3 is plastic while maintaining a predetermined shape by itself.

A material having shape memory property is suitable as the holding member 3. Examples of this substance include known substances having shape memory properties such as metals (alloys) and resins, and among them, a resin composition having shape memory properties is preferable. This is because, in addition to cost, when processing plastic lenses for spectacles, the plastic lens can be processed together with the lens holder 1 without worrying about the interference of a cutting blade or a polishing tool.
In addition, the translucency is described in <2. The lens holding method (blocking mechanism)> will be described below, but the holding member 3 in the present embodiment preferably has a UV (hereinafter referred to as “ultraviolet light”) transmission function. When the lens 5 is a plastic lens for spectacles, the lens 5 is often provided with a UV shielding function. In such a case, if the material 4a (UV curable resin) of the joining member provided between the lens holder 1 and the lens 5 is to be cured, the UV curable resin can be used even if UV irradiation is performed from the plastic lens side for glasses. UV does not reach until the lens holder 1 and the lens 5 cannot be joined. Therefore, it is necessary to irradiate UV from the holding member 3 side, not from the plastic lens side for glasses. For that time, it is preferable that the holding member 3 in this embodiment has a UV transmission function.

  In Patent Document 4, there was a risk of a gap between the solidified thermoplastic resin and the plastic lens due to the difference in thermal expansion coefficient between the block material made of the thermoplastic resin and the plastic lens. If it is the holding member 3 of this embodiment, the raw material of the holding member 3 does not need to be melted, and may be heated to a temperature at which plasticity is developed. Therefore, it is possible to prevent the above gap from occurring in the first place, and it is possible to perform blocking well. In addition, since it is not necessary to set the holding member 3 at such a high temperature that the material is melted, it is possible to prevent the plastic lens itself from being denatured.

  In the first place, as for the prism ring positioned in Patent Document 4 as the prior art, as shown in Paragraph 0005 of Patent Document 4, the prism ring is a box-shaped one composed of a circular bottom plate and a surrounding wall surrounding the periphery, or It is a ring shape formed only from the peripheral wall, and when viewed in cross section, the upper end of the peripheral wall reflects the prism amount (inclination angle θ from the horizontal) according to the prescription of the user from the beginning. It has become. In the technique described in Patent Document 4, a frame type corresponding to the diameter of the lens 5 is prepared from the beginning (paragraph 0035). Then, a thermoplastic resin is injected between the lens 5 and the frame mold to form a block material corresponding to the optical surface of the lens 5.

  On the other hand, the holding member 3 of the present embodiment uses a material having the above properties. In this way, the roles of conventional alloys, thermoplastic resins, and prism rings are taken together.

That is, from the viewpoint of the prism ring, conventionally, the shape of the prism ring 7 needs to be determined first based on the shape data of the optical surface of the lens 5 according to the shape of the optical surface of the lens 5. there were. However, in the case of the holding member 3 of the present embodiment, the holding member 3 is made plastic while maintaining the predetermined shape by itself under predetermined conditions, and then the lens 5 (the material of the bonding member) is used. A simple operation of pressing against the holding member 3 (with 4a in between) may be performed at a minimum. In this way, it is not necessary to calculate the shape of the prism ring 7 having a predetermined prism while reflecting the shape of the multifocal lens. That is, the conventional prism ring 7 can be eliminated.
In addition, as described above, the shape of the multifocal lens is determined according to the individual prescription, so that each of the multifocal lenses has a very complicated shape. The holding member 3 that accurately reflects the shape of the optical surface while reflecting the predetermined prism amount is obtained. That is, as shown in FIG. 2A, not only the lens holder 1 with the lens 5 that holds the lens 5 that does not have the prism but also a predetermined as shown in FIG. When holding the lens 5 having a prism amount (a prism amount corresponding to the tilt angle θ from the horizontal), a holding member 3 that accurately reflects the shape of the optical surface while reflecting the prism amount is obtained. It is done.

  Further, from the viewpoint of an alloy or a thermoplastic resin, conventionally, in order to form an alloy or a block material corresponding to the optical surface of the lens 5, it is necessary to once melt the alloy or the thermoplastic resin. However, the holding member 3 according to the present embodiment maintains a predetermined shape by itself while having plasticity under predetermined conditions. Therefore, a step of injecting a molten material of an alloy or a block material becomes unnecessary. In this case, defects do not occur in the first place during the implantation process, and a holder as designed can be formed. As a result, the lens 5 can be processed as designed.

  Furthermore, the characteristics of the holding member 3 of the present embodiment are not limited to the expression of the plasticity. In the holding member 3 of the present embodiment, a material that exhibits the plasticity under a predetermined condition but loses the plasticity under another predetermined condition is used as the holding member 3. That is, while the lens 5 is held by the lens holder 1, the holding member 3 loses the plasticity and maintains a shape that matches the optical surface of the lens 5. In this way, the shape of the holding member 3 remains the same as the shape in which the lens 5 is pressed against the holding member 3 (with the material 4a of the bonding member interposed therebetween) (that is, the shape matching the optical surface of the lens 5). It will be fixed. Then, the lens 5 is held with respect to the lens holder 1 by curing the material 4a of the bonding member.

  By having the above configuration, the holding member 3 of the present embodiment can take on the role of the conventional alloy, thermoplastic resin, and prism ring 7 at once. When blocking, plasticity is provided, and by deforming this member from a predetermined shape in accordance with the optical surface shape of the lens 5, the transfer of the shape of the optical surface of the lens 5 can be performed relatively easily. . When the lens 5 needs to be held, such as during lens processing, the lens 5 can be held by losing the plasticity. Moreover, this holding can be performed without using the prism ring 7.

  The “predetermined condition” for the holding member 3 of the present embodiment to exhibit plasticity may be any condition as long as a substance having a known shape memory property exhibits plasticity. If a resin composition having shape memory properties is used for the holding member 3 as in the present embodiment, one of the predetermined conditions is a temperature-related condition. Of course, it may be other than that, and light or vibration may be given. Further, when “another predetermined condition” and the above “predetermined condition” that cause loss of plasticity are conditions having a predetermined range, these ranges may partially overlap. For example, when the conditions under which plasticity can be developed and plasticity can be lost can be specified in a temperature range, they may partially overlap in that temperature range.

  Further, in the holding member 3 of the present embodiment, the “predetermined shape” maintained by itself in a plastic state may basically be an arbitrary shape. Note that the shape of the holding member 3 when holding the lens 5 while losing plasticity may be any shape that can hold the lens 5 with the help of the holding member 3 alone or the joining member 4. The predetermined shape is the shape when holding the lens 5, and examples include a substantially disk shape, a substantially ring shape, a plate shape, a block shape, and the like.

  If the resin composition has shape memory, the initial shape may be a memorized shape. However, the predetermined shape is preferably a shape that follows at least a part of the optical surface of the lens 5. In order to transfer the shape of the optical surface of the lens 5 to the lens holder 1, the holding member 3 is made plastic, and when the lens 5 is pressed against the holding member 3 (with the material 4 a of the joining member interposed), “ If the “predetermined shape” is a shape that follows the optical surface of the lens 5, the plastic holding member 3 may be slightly deformed. That is, the holding member 3 having a shape reflecting the prism amount of the individual lens 5 of the user can be formed by slight pressing.

  Normally, enormous calculation is required when the amount of prism is reflected in the calculation on the optical surface. However, when the “predetermined shape” is a shape that follows at least a part of the optical surface of the lens 5, it is possible to form the holding member 3 that also plays the role of the prism ring only by a simple operation of pressing. .

Here, the “followed shape” refers to a shape that is the same as or similar to the shape of the optical surface of the lens 5. This “similar shape” refers to a shape that reduces the amount of deformation of the holding member 3 when the lens 5 is pressed against the holding member 3 (with the material 4a of the bonding member interposed therebetween).
Specifically, when the shape of the optical surface of the lens 5 is convex, the shape of the portion of the holding member 3 against which the lens 5 is pressed is concave. Conversely, when the shape of the optical surface of the lens 5 is concave, the shape of the portion of the holding member 3 against which the lens 5 is pressed is convex.

  Further, as indicated by “at least part” of “a shape following at least a part of the optical surface of the lens 5”, the “predetermined shape” stored in the holding member 3 is copied along the entire optical surface of the lens 5. ”Is not necessary. After all, the holding member 3 of the present embodiment only needs to reflect at least the prism amount of the lens 5 and hold a shape that matches a part of the optical surface of the lens 5 when the lens 5 is held. If the example is given, the substantially ring-shaped holding member 3 will be mentioned. In the case of the substantially ring-shaped holding member 3, a shape similar to the shape of a part of the optical surface of the lens 5 (a portion near the outer periphery of the lens 5) is set in advance as a stored “predetermined shape”. After that, the material 4a of the joining member is applied in advance on the ring of the holding member 3, and the lens 5 is reflected so that the prism amount and the shape of a part of the optical surface (the vicinity of the outer periphery of the lens 5) are reflected. Is pressed against the holding member 3 to deform the holding member 3. By doing so, the part on the ring of the holding member 3 reflects the prism amount and the shape of the optical surface. At this time, since the predetermined shape is a shape that follows a part of the optical surface, the thickness of the joining member 4 can be reduced, and the loss of the material 4a of the joining member can be reduced. As a result, the lens holder 1 and the lens 5 can be appropriately held finally. Of course, the disc-shaped holding member 3 may be used, and the shape following the entire optical surface may be a “predetermined shape”, which may be preferable from the viewpoint of bonding force.

When forming the lens holder 1 based on the above configuration, the amount of prism often used for the lens 5 is classified into several types (for example, small prism amount (FIG. 3A), medium prism amount (FIG. 3B)). , A large prism amount (classified as FIG. 3 (c)), and the surface shape of the holding member 3 reflecting the prism amount of the plurality of classifications is stored as “predetermined shape” in the holding member 3 from the beginning. You can leave it.
Similarly, the curve values often used for the lens 5 are classified into several types (for example, classified as a small curvature, a medium curvature, and a large curvature). "May be stored in the holding member 3 from the beginning.
By adopting the above configuration, the amount of deformation of the holding member 3 can be reduced when any lens 5 is held. If it becomes so, it will also lead to simplification of the pressing process of the lens 5, and the time which the whole lens manufacturing process requires can be shortened.

  As another specific example, the “predetermined shape” of the portion of the holding member 3 against which the lens 5 is pressed may be a shape possessed by the spherical lens 5 (for example, a predetermined spherical + toric surface shape). . By doing so, the holding member is deformed so that only the component (for example, aspherical shape) deviated from the spherical lens shape in the individual lens 5 of the user is reflected in the lens holder 1 with respect to the basic spherical lens shape. 3 can be added.

C) Joining member The joining member 4 of the present embodiment may be any member that joins the holding member 3 and the lens 5. However, considering the ease of joining, the joining member material 4 a is preferably a substance that can be applied onto the holding member 3. In consideration of the influence on the lens 5, the material 4a of the bonding member is preferably a substance that is cured by energy (for example, light) other than temperature. A material having shape memory property may be used for the bonding member 4.
In the present specification, a state after the holding member 3 and the lens 5 are joined (for example, after curing) is referred to as a “joining member 4”. On the other hand, the state before the holding member 3 and the lens 5 are joined (for example, before curing) is referred to as a “joining member material 4a”.

  Note that a UV curable resin is suitable as the material 4a of the joining member. If it is a UV curable resin, it can be cured by a relatively simple technique for curing. In addition, there is little risk of the lens 5 being affected by deformation or alteration. If the bonding member 4 is a cured UV curable resin, as in the case of the holding member 3, when processing a plastic lens for spectacles, as described above, the lens can be used without worrying about the interference of a cutting blade or a polishing tool. The plastic lens can be processed together with the holder 1.

  By the way, when the “predetermined shape” in the holding member 3 is a shape that follows at least a part of the optical surface of the lens 5, there is a remarkable effect that the thickness of the bonding member 4 can be reduced. Hereinafter, the thickness of the joining member 4 will be described in detail.

  The joining member 4 in the present embodiment uses a UV curable resin. In a substance that bonds a certain substance to a certain substance, the bonding force is related to the surface tension (surface free energy) with respect to the certain substance and the thickness of the bonding member 4. Generally, when this kind of joining member 4 becomes too thick, joining force will fall. Therefore, this kind of joining member 4 needs to be thin. Moreover, since UV curable resin is not cheap, it is also necessary to reduce the material used for joining as much as possible.

  Therefore, when the “predetermined shape” is a shape that follows at least a part of the optical surface of the lens 5 as in the holding member 3 of the present embodiment, the material 4a of the joining member applied onto the holding member 3 is minimized. Just do it. That is, if the bonding member material 4a is applied on the holding member 3 having a shape reflecting the optical surface of the lens 5, the lens 5 having a shape following the holding member 3 is pressed. The amount of the bonding member material 4a flowing down from the end of the member 3 can be extremely reduced.

  On the other hand, in the case of Patent Documents 1 to 3, or in the case of Patent Document 4, a configuration is adopted in which the lens 5 is immersed in the surface portion of a molten alloy or a pool of thermoplastic resin (in other words, a pool). ing. When the shape of the optical surface of the lens 5 is convex, the thickness of the alloy or the thermoplastic resin (block material) near the apex of the convex portion is reduced, but other portions (for example, the portion corresponding to the end of the lens 5) ) Has a considerable thickness. In particular, in Patent Document 4, when a single prism ring is used and the lens 5 has a large prism amount (tilt), the thickness of the block material at the portion corresponding to the end of the lens 5 is extremely large. If so, there is a possibility that the bonding force between the lens holder 1 and the lens 5 cannot be secured.

However, in the case of the lens holder 1 of the present embodiment, since the holding member 3 that already has a shape reflecting the optical surface of the lens 5 is used, there is no need to provide a pool of the material 4a of the joining member, and the holding member Even if the lens 5 is pressed against 3 and the shapes of both are matched, the extra material 4a for the joining member is not generated. If it becomes so, it becomes possible to ensure appropriate joining force, and since UV hardening resin is not cheap, it becomes possible to reduce the raw material used for joining as much as possible.
Even if the “predetermined shape” of the holding member 3 of the present embodiment does not follow at least a part of the optical surface of the lens 5, the holding member 3 is first described as described in [Embodiment 2] described later. Is deformed in accordance with the optical surface of the lens 5, the joining member material 4 a applied onto the holding member 3 can be minimized by applying the joining member material 4 a after the deformation. As a result, even if the “predetermined shape” does not follow at least a part of the optical surface of the lens 5, the above-described effect can be obtained.

D) Others In the present embodiment, in addition to the holding member 3 and the bonding member 4, what constitutes the lens holder 1 may be provided. An example is Yatoi 2. Further, a protective film may be separately provided between the bonding member 4 and the lens 5. Even if it is other than the yatoy 2 and the protective film, it may be provided in the lens holder 1 of the present embodiment as appropriate.
In addition, you may use a well-known technique about the member which has no special mention in the lens holder 1. FIG.
In addition, in the holding member 3 of this embodiment, there exists a preferable aspect also regarding deblocking. Regarding that, the following <2. Lens holding method (blocking mechanism)> will be described in detail.

<2. Lens holding method (blocking mechanism)>
The outline of the holding method of the lens 5 in this embodiment will be described first. In this embodiment, the holding member deforming step for deforming the holding member 3 in accordance with the shape of the lens 5, and the lens after the holding member deforming step are performed. The holding member 3 has plasticity while maintaining a predetermined shape by itself in the holding member deformation step, and matches the shape of the optical surface of the lens 5. On the other hand, the plasticity is lost in the holding step.
Hereinafter, the holding method of the lens 5 will be described in detail with reference to FIG. Moreover, processes other than the above will also be described. FIG. 4 is a schematic cross-sectional view showing the method of holding the lens 5 in this embodiment in the order of steps.
In addition, about a process without special mention, you may use a well-known technique.

A) Application Step of Bonding Member Material (UV Curing Resin) First, as shown in FIG. 4A, the bonding member material 4 a (hereinafter also referred to as “UV curing resin”) is formed on the holding member 3. Apply. The shape of the holding member 3 at this time may be a shape that can reflect the optical surface of the lens 5 in the subsequent holding member deformation step. Of course, in order to perform the subsequent steps smoothly, it is preferable to have the above-mentioned predetermined shape (that is, in a state in which the shape is memorized). Further, the plasticity may be lost. Rather, in order to avoid unnecessary deformation of the holding member 3 during application of the UV curable resin, it may be preferable to lose the plasticity. In addition, what is necessary is just to use the apply | coating method of UV curable resin.

B) Plasticity development process (heating process)
After the UV curable resin is applied on the holding member 3, the holding member 3 is heated. At this time, the UV curable resin may be heated as long as there is no problem in the subsequent bonding process. By doing so, the holding member 3 is made plastic.

C) Holding member deformation | transformation process As shown in FIG.4 (b), the lens 5 is pressed with respect to the holding member 3 which plasticity expressed, and the UV curable resin apply | coated on it. Then, the holding member 3 is deformed according to the shape of the lens 5. At that time, the UV curable resin is present between the holding member 3 and the lens 5 in a liquid state. The lens 5 may have a UV shielding function. In that case, UV is irradiated from the holding member 3 side in the following joining process (UV irradiation process).

D) Joining process (UV irradiation process)
Next, the UV curable resin is irradiated with UV to cure the UV curable resin provided on the holding member 3, and the holding member 3 and the lens 5 are bonded. At that time, when the plastic lens for spectacles has a UV shielding function, the UV curable resin is cured by irradiating UV from the holding member 3 side. Then, the holding member 3 and the lens 5 are bonded. Usually, a plastic lens for spectacles has a UV shielding function. If UV is irradiated from the plastic lens side for spectacles, the UV is shielded by the lens 5 and the UV curable resin cannot be cured. Therefore, as shown in FIG. 4C, the UV is made to reach the UV curable resin by irradiating the UV from the holding member 3 side, and the UV curable resin is cured.

E) Holding Step Thereafter, the holding member 3 is cooled in order to suppress the deformation of the holding member 3 to ensure the holding of the lens 5 and to lose the plasticity of the holding member 3. At this time, in the present embodiment, both the lens 5 and the bonding member 4 may be cooled in order to facilitate the work. By doing so, the plasticity of the holding member 3 is lost, and the shape of the holding member 3 is fixed while reflecting the shape of the optical surface of the lens 5. In addition, the holding member 3 and the lens 5 are joined by the joining member 4 (UV curable resin). After all, by maintaining this state, the holding process of the lens 5 by the lens holder 1 is performed.
Note that the CG processing and polishing are performed during this holding step.

F) Deblocking After a series of processing is completed, the lens 5 is removed from the lens holder 1. The holding member 3 in the present embodiment maintains the shape matched to the optical surface of the lens 5 under predetermined conditions in addition to the expression and loss of plasticity related to blocking, while the holding member 3 with respect to the lens 5 under other predetermined conditions. It has the property of self-deforming into a shape that weakens the holding force. That is, when the lens 5 is detached from the lens holder 1, the holding member 3 is self-deformed into a shape that weakens the holding force with respect to the lens 5. By having this configuration, the lens holder 1 in the present embodiment exhibits a special effect even during deblocking. Hereinafter, the effect will be described in detail.

  According to the present embodiment, while the lens holder 1 holds the lens 5 while maintaining the shape, the lens holder 1 self-deforms at the time of deblocking, so that the lens holder 1 changes the lens. 5 can be easily detached. In this case, the method of heating the block material or dissolving the block material with a chemical can suppress the possibility of any undesirable effects such as deformation or alteration on the lens 5 that is the final product. In particular, when the lens 5 is a plastic lens, it is possible to effectively suppress the possibility that the influence becomes significant. Moreover, even if it becomes easy to deblock a plastic lens by heating the block material which consists of thermoplastic resins like patent document 4, the possibility that the plastic lens which also contains resin will also deform | transform and degenerate is suppressed. Is possible. Therefore, it is not necessary to consider the relationship between the melting point and glass transition temperature of the block material and the melting point and glass transition temperature of the plastic lens in order to prevent the plastic lens from being deformed or altered. When this happens, it is not necessary to limit the materials of the plastic lens and block material that can be used. In addition, precise temperature control is not necessary in deblocking, and as a result, the time required for the entire lens manufacturing process can be shortened, leading to improved production efficiency.

  Furthermore, according to this embodiment, the lens holder 1 after deblocking can be recycled (reused). Then, it becomes unnecessary to separately prepare raw materials for the lens holder 1 other than the lens 5. If that happens, it will also lead to a reduction in waste. As a result, the cost can be reduced and the environment can be fully considered in accordance with the recent situation where recycling is recommended.

Further, even when compared with a method in which an adhesive sheet is provided between the lens holder 1 and the lens 5, by applying the method of the present embodiment, there is no need to dispose like an adhesive sheet, and the waste material It also leads to a decrease. As a result, the cost can be reduced and the environment can be fully considered in accordance with the recent situation where recycling is recommended.
In addition, when blocking is performed using an adhesive sheet, when the deblocking is performed, it is not necessary to heat the lens 5 together to detach the lens 5 from the adhesive sheet, resulting in the deformation or alteration of the lens 5 described above. You don't have to.

  Even when compared with the method of performing vacuum chucking, the lens holder 1 that can follow the shape of the optical surface of the lens 5 as in Patent Documents 1 to 4 cannot be manufactured. That is, it is necessary to provide the lens holder 1 with a vacuum chuck structure after forming an alloy or a block material as in Patent Documents 1 to 4. It is assumed that this work is not easy. In addition, it is not practical to provide a vacuum chuck structure for a large number of lens holders 1 for each of the various lenses 5 as described above.

  Even when compared with a method of performing vacuum chucking or a method of mechanically deblocking the lens holder 1 and the lens 5, if the above-described holding member 3 is used, the holding member 3 having an initial shape can be used. It is possible to form a structure that can be used as a vacuum chuck, and since the holding member 1 is not mechanically deblocked but is deformed by itself, deblocking is facilitated. The possibility of unexpectedly scratching the lens 5 can be reduced.

  In the conventional lens holder 1, the lens 5 and the lens holder 1 are firmly blocked so that the optical surface of the lens 5, the shape of the bevel, the shape of the bead, the edge thickness, etc. can be processed as designed. Regardless of the situation, the lens holder 1 of the present embodiment can reduce the degree of deblocking difficulty.

  As described above, according to the present embodiment, it is possible to suppress the influence on the lens 5 at the time of detachment while simply detaching the lens 5 from the lens holder 1.

  Hereinafter, the deblocking (desorption method) of the lens 5 will be described in detail with reference to FIG. FIG. 5 is a schematic cross-sectional view showing the method of detaching the lens 5 in this embodiment in the order of steps.

First, the outline will be described. After the holding step, the holding member 3 is self-deformed into a predetermined shape that weakens the holding force with respect to the lens 5, whereby the lens 5 held by the lens holder 1 is moved. A detaching step (deblocking) for detaching from the lens holder 1 is performed.
That is, from the state in which the holding step is performed as shown in FIG. 5A, the holding member 3 in the lens holder 1 has shape memory as shown in FIG. Self-deformation (that is, restoration to a predetermined shape) to a predetermined shape that weakens the holding force.

Further, if the holding member 3 is a resin composition having shape memory, the memorized shape corresponds to the shape of the optical surface of the lens 5 in the holding member 3 when the optical surface of the lens 5 is convex. It is preferable that the shape of at least a part of the portions is convex or flat. Conversely, when the optical surface of the lens 5 is concave, it is preferable that at least a part of the portion of the holding member 3 corresponding to the shape of the optical surface of the lens 5 is concave or flat. This is because, in F) deblocking to be described later, when the holding member 3 is self-deformed so as to be restored to the memorized shape, the holding member 3 has the same shape as the optical surface of the lens 5 (the lens is convex). The holding member is also convex. In this case, it is possible to weaken the holding force with respect to the lens 5 by self-deformation (for example, by heating) of the holding member 3 and to facilitate deblocking. In this case, the predetermined shape may be convex or flat if the optical surface of the lens is convex, and the predetermined shape may be concave or flat if the optical surface of the lens 5 is concave. By doing so, it is more preferable that a force acts on the entire optical surface of the lens 5 in the direction in which the lens 5 is pushed out by self-deformation of the holding member 3 during F) deblocking. On the other hand, when the lens holder 1 holds the convex surface of the lens 5, the shape of the holding member 3 is concave. Therefore, from the viewpoint of weakening the holding force with respect to the lens 5, a single convex shape is formed on the portion of the holding member 3 corresponding to the peripheral portion of the optical surface of the lens 5 that is relatively infrequently used (the peripheral portion of the holding member 3). Alternatively, a concave shape may be stored in the holding member 3 as a whole so that the convex surface of the lens 5 can be smoothly aligned while being stored in a plurality of portions. At this time, the convex shape stored in a part of the holding member 3 may be a continuous convex (for example, a continuous convex shape along the outer periphery of the holding member 3) or a single convex (for example, near the outer periphery of the holding member 3). (A single or a plurality of protrusions stored in the memory).
In summary, F) When the holding member 3 having a shape matched to the optical surface of the lens 5 before deblocking is self-deformed in F) deblocking, the lens 5 is detached by pushing out the optical surface of the lens. Preferably, it can be self-deformed into a shape that promotes

G) Shape Restoration Step of Holding Member Furthermore, the lens holder 1 of the present embodiment can also solve “recyclability” that has been a problem particularly during blocking. Hereinafter, the importance of the shape restoration process of the holding member 3 that contributes to the improvement of recyclability will be described in detail.

  Conventionally, instead of preparing a large number of prism rings according to prescription as in Patent Document 4, when manufacturing the lens 5 according to each person's prescription, it is necessary to dispose of the thermoplastic resin each time. Moreover, also about the blocking ring (prism ring) in patent documents 1-3, you have to produce a prism ring according to each prescription of the person who uses the lens 5. FIG. Therefore, it leads to an increase in waste, and as a result, the cost increases. Naturally, despite recent circumstances where recycling is recommended, consideration for the environment has been poor.

However, the holding member 3 in the present embodiment uses a substance having a shape memory property (resin plastic). Therefore, after deblocking, the shape before blocking is restored by placing the holding member 3 in an environment of a predetermined condition (for example, temperature) that exhibits shape memory properties. Before and after that, as shown in FIG. 5C, the joining member 4 is removed as necessary. As a specific method, a known method may be used. For example, when a UV curable resin is used as the bonding member 4, a dissolving agent for the UV curable resin may be used. Thereafter, in order to perform the holding process for the next lens 5, A) the application process of the material of the bonding member (UV curable resin) is performed again on the holding member 3 having the restored shape. Then, B) a plastic expression step (heating step), C) a holding member deformation step, and the like are performed on another lens 5.
The G) holding member shape restoration step, which is the main step, may be performed as F) deblocking or as a separate step. Similarly, the G) holding member shape restoring step, which is the main step, is performed when the material 4a of the joining member is installed after the holding member 3 is deformed as in [Embodiment 2] described later. B) Plasticity developing step (Warming step) may also be performed, or F) deblocking may be further performed. In this case, the “predetermined shape” refers to a shape stored in advance in a resin plastic having shape memory. Of course, these steps may be performed as separate steps.

  By doing so, as in Patent Documents 1 to 4, the prism ring or the block material does not have to be disposable. That is, at least the holding member 3 of the lens holder 1 in the present embodiment can be recycled (reused) with respect to a completely different lens 5 even after the holding process of the lens 5 is performed. Become. As described above, the lens 5 usually has a different optical surface shape depending on the individual prescription of the user. Nevertheless, the lens holder 1 of the above embodiment has the effect of having versatility for a wide variety of lenses 5 and improving the recyclability.

<3. Lens manufacturing method>
Hereinafter, the manufacturing method of the lens 5 in this embodiment is demonstrated. As described at the beginning, in this embodiment, a case where a plastic lens for spectacles is used will be described. In addition, about the part which overlaps with said content, it abbreviate | omits as much as possible for convenience of explanation.
In addition, about a process without special mention, you may use a well-known technique.

A) Selection of Lens The lens 5 may have any shape. In the present embodiment, an example in which the convex portion of the lens 5 is arranged on the lens holder 1 side will be described. An example in which the convex portion of the lens 5 has already been formed with an optical surface, while the surface facing it is an unprocessed lens 5 (semi-finished lens) will be described.

B) Blocking <2. The lens 5 is blocked on the lens holder 1 by the method described in the lens holding method (blocking mechanism)>. Then, the lens 5 is held by the lens holder 1. Since details are as described above, description is omitted.

C) CG processing After blocking, the lens 5 together with the lens holder 1 is attached to the curve generator, and a cutting process of cutting the unprocessed surface of the held lens 5 into a predetermined shape is performed. In that case, you may attach the lens holder 1 with the lens 5 with the apparatus called the layout blocker made from said SATISLOH. The lens 5 may be cut together with the lens holder 1.

  In this way, the lens 5 is attached to the curve generator that performs three-dimensional NC control via the lens holder 1, and the unprocessed surface is cut into a predetermined surface shape. In this way, the lens 5 which is a semi-finished lens is subjected to CG processing to obtain the lens 5 before polishing.

  In recent CG processing, high-speed and high-precision NC (numerical value) controlled CG processing is possible, so sand similar to lapping processing after a cutting process of cutting into a predetermined surface shape. The hanging step may be omitted. Of course, after the sanding step, the following polishing may be performed.

D) Polishing After the CG processing, the lens 5 is attached to the polishing apparatus via the lens holder 1 and the cut surface is polished. This step eliminates a step or the like of a processing mark formed on the optical surface of the plastic lens by CG processing. In addition, you may perform this process collectively with the same grinding | polishing apparatus with the below-mentioned finish grinding | polishing. Further, the above CG processing may be performed by a polishing apparatus having a CG processing function.

  After the above rough polishing, polishing (that is, final polishing) is performed until the lens 5 is in a mirror state. Note that rough polishing and finish polishing may be performed together in one step.

E) Deblocking <2. The lens 5 is deblocked on the lens holder 1 by the method described in the section of “Lens Holding Method (Blocking Mechanism)>. That is, the lens 5 is detached from the lens holder 1. Since details are as described above, description is omitted.

F) Others (color dyeing, inspection, ultrasonic cleaning, hard coat processing, multi-coat processing, etc.)
After finishing polishing, if necessary, color dyeing / inspection / ultrasonic cleaning / hard coating / multi-coating are applied to the plastic lens. In this way, the final product of the plastic lens for spectacles is manufactured.

<4. Advantages of the embodiment>
The effect of this embodiment will be described again in detail below, although it will be described again.

  Conventionally, as described in Patent Document 4, there is a risk of generating a gap between the solidified thermoplastic resin and the plastic lens due to a difference in coefficient of thermal expansion between the block material made of the thermoplastic resin and the plastic lens. However, in the case of the holding member 3 of the present embodiment, the material of the holding member 3 does not need to be melted and may be heated to a temperature at which plasticity is developed. Therefore, it is possible to prevent the above gap from occurring in the first place, and it is possible to perform blocking well. In addition, since it is not necessary to set the holding member 3 at such a high temperature that the material is melted, it is possible to prevent the plastic lens itself from being denatured.

  Moreover, the holding member 3 of the present embodiment maintains a predetermined shape by itself from the stage before blocking, and is provided with plasticity at the time of blocking, and this member is predetermined according to the optical surface shape of the lens 5. On the other hand, when the lens 5 is required to be held, such as during lens processing, the lens 5 is deformed so that the lens 5 is held by being lost. . In this way, the roles of conventional alloys, thermoplastic resins, and prism rings are taken together.

  In other words, from the viewpoint of a prism ring, the holding member 3 is made plastic while maintaining a predetermined shape by itself under a predetermined condition, and then the lens 5 (the bonding member material 4a is changed). It is only necessary to perform a simple operation of pressing against the holding member 3 with a minimum. By doing so, it is not necessary to determine the shape of the prism ring 7 having a predetermined prism while reflecting the shape of the multifocal lens 5 each time by calculation. That is, the conventional prism ring 7 can be eliminated. In addition, as described above, the shape of the multifocal lens 5 is determined according to the individual prescription, so that each of the multifocal lenses 5 has a very complicated shape. The holding member 3 that accurately reflects the shape of the optical surface while reflecting the predetermined prism amount is obtained.

  Further, from the viewpoint of alloy or thermoplastic resin, the holding member 3 of the present embodiment maintains a predetermined shape by itself while having plasticity under a predetermined condition. Therefore, a step of injecting a molten material of an alloy or a block material becomes unnecessary. In this case, defects do not occur in the first place during the implantation process, and a holder as designed can be formed. As a result, the lens 5 can be processed as designed.

  By having the above-described configuration, the holding member 3 of the present embodiment can take on the roles of conventional alloys, thermoplastic resins, and prism rings. When blocking, plasticity is provided, and by deforming this member from a predetermined shape in accordance with the optical surface shape of the lens 5, the transfer of the shape of the optical surface of the lens 5 can be performed relatively easily. . When the lens 5 needs to be held, such as during lens processing, the lens 5 can be held by losing the plasticity. Moreover, this holding can be performed without using a prism ring.

  Further, in the case of the lens holder 1 of the present embodiment, for example, when the “predetermined shape” that has been memorized in advance follows the optical surface of the lens 5, or as in the modification described later, the holding member 3 is first used. The holding member 3 having a shape that already reflects the optical surface of the lens 5 is used, as in the case where the optical surface of the lens 5 is transferred to the lens and the UV curable resin is applied thereafter. Therefore, it is not necessary to provide a pool of the material 4a for the joining member. In this case, even if the lens 5 is pressed against the holding member 3 to match the shapes of both, the extra material 4a for the joining member is not generated. As a result, it is possible to ensure an appropriate bonding force, and since the UV curable resin is not inexpensive, it is possible to reduce the materials used for bonding as much as possible.

  Furthermore, according to this embodiment, the lens holder 1 after deblocking can be recycled (reused). Then, it becomes unnecessary to separately prepare raw materials for the lens holder 1 other than the lens 5. If that happens, it will also lead to a reduction in waste. As a result, the cost can be reduced and the environment can be fully considered in accordance with the recent situation where recycling is recommended.

  As described above, according to the present embodiment, the lens holder 1 and the lens 5 can be formed in a simple and quick manner according to the optical surface of the lens 5 while suppressing the amount of the material used for the lens holder 1. A manufacturing method can be provided.

[Embodiment 2]
In the first embodiment, the case where the holding member 3 is deformed together with the bonding member material 4a by pressing the lens 5 after providing the bonding member material 4a on the holding member 3 has been described. On the other hand, in the present embodiment, a case will be described in which the holding member 3 is first deformed according to the optical surface of the lens 5 and then the material 4a of the joining member is applied.

  Specifically, B) the plastic expression step (heating step) and C) the holding member deformation step in the above embodiment are performed prior to the application step of A) the material for the joining member (UV curable resin). . That is, as shown in FIG. 6A, B) a plasticity developing step (heating step) is performed on the holding member 3 in advance. Then, as shown in FIG. 6B, the optical surface of the lens 5 is pressed against the holding member 3 having plasticity (however, the material 4a of the joining member is not installed). In this way, the shape of the optical surface is transferred to the holding member 3. Thereafter, as shown in FIG. 6C, the bonding member material 4 a is placed on the holding member 3 having a shape matched to the optical surface of the lens 5. Specifically, a UV curable resin is applied to the holding member 3 having a shape that matches the optical surface of the lens 5. By doing so, it is only necessary to apply the UV curable resin only in an amount corresponding to the shape of the holding member 3 to be applied. If it does so, the usage-amount of UV curable resin can be reduced and it leads to a cost reduction. In addition, since the UV curable resin can be thinly applied in accordance with the shape of the holding member 3, the thickness of the bonding member 4 itself after being finally cured can be reduced. If it becomes so, it becomes possible to ensure the joining force between the holding member 3 and the lens 5 appropriately.

  Thereafter, as shown in FIG. 6D, the lens 5 is again pressed against the holding member 3 provided with the bonding member material 4 a. Thereafter, as shown in FIG. 6E, UV irradiation is performed from the lens holder 1 side to cure the UV curable resin, thereby forming the bonding member 4. In addition, in the case of FIG.6 (d), the holding member 3 may have plasticity and conversely may lose plasticity. However, since the accurate shape of the optical surface is already reflected in the holding member 3, in order to suppress unintended deformation of the holding member 3 due to the pressing of the lens 5 again, the holding member 3 is joined to the bonding member. When the lens 5 is pressed again against the material provided with the material 4a, it is preferable that the plasticity is lost.

[Embodiment 3]
In the present embodiment, a specific compound composition and manufacturing method of the holding member 3 will be described.

  As an example, a crystalline urethane polymer is used for the holding member 3 of the above embodiment. This crystalline urethane polymer is a substance having an ordered molecular arrangement and a clear crystal structure. It is obtained by synthesizing a crystalline polyester polyol having a melting point and a polyfunctional isocyanate with a urethane bond. Considering the temperature at which the shape of the resin compound having shape memory (hereinafter also simply referred to as “shape memory resin”) is restored, the crystalline polyester polyol has a melting point of 20 ° C. or higher, preferably 40 ° C. or higher. desirable. If the crystalline polyester polyol has a melting point of 20 ° C. or higher, it can be restored to a predetermined shape even at room temperature. Furthermore, if it is 40 degreeC or more, it will be possible to restore | restore to a predetermined shape, even if it is the temperature in process.

  The crystalline polyester polyol is a reaction product of one or more types of aliphatic polycarboxylic acids and one or more types of aliphatic polyols.

Examples of the aliphatic polycarboxylic acid include oxalic acid, malonic acid, succinic acid, glutamic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, nonamethylene dicarboxylic acid, decamethylene dicarboxylic acid, and undecamethylene. Examples thereof include dicarboxylic acid and dodecamethylene dicarboxylic acid.

  Examples of the aliphatic diol include ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, Examples include 1,9-nonanediol, 1,10-decanediol, 1,12-dodecanediol, 1,14-tetradecanediol, 1,16-hexadecanediol, 1,18-octadecanediol, and the like.

  In the above embodiment, as the polyfunctional isocyanate compound, 4,4′-diphenylmethane diisocyanate (MDI), p-phenylene diisocyanate, tolylene diisocyanate (TDI), 1,5-naphthalene diisocyanate (NDI), 4,4′- Examples include diphenylene diisocyanate, 1,5-octylene diisocyanate, hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), xylylene diisocyanate (XDI), hydrogenated MDI, and hydrogenated XDI.

  The equivalent ratio of the OH group of the crystalline polyester polyol and the NCO group of the polyfunctional isocyanate is preferably 1: 1.1 or more (that is, the ratio of the NCO group of the polyfunctional isocyanate is 1.1 or more). In addition, a urethane prepolymer having an equivalent ratio of the OH group of the crystalline polyester polyol and the NCO group of the polyfunctional isocyanate of 1: 2 or more (that is, the ratio of the NCO group of the polyfunctional isocyanate of 2 or more) was prepared, and this was suitably used. You may make it react with a hardening | curing agent.

  The synthetic reaction of the crystalline urethane polymer is carried out by putting a predetermined amount of the crystalline polyester polyol into a reaction vessel and stirring while heating to 60 to 200 ° C., preferably 100 to 150 ° C. in a heater that can be controlled with a uniform temperature distribution. Then, dehydration is sufficiently performed in a vacuum or by blowing dry nitrogen. Next, a predetermined amount of a polyfunctional isocyanate compound is added, and dry nitrogen is blown into the reaction vessel, or the reaction vessel is evacuated and stirred so that moisture does not enter.

  After the stirring, reaction and curing are performed at room temperature, preferably 40 to 120 ° C., and the holding member 3 is formed into a predetermined shape. In addition, this holding member 3 memorize | stores the shape (predetermined shape) at the time of making it harden | cure.

  The shape memory fixing jig returns to the memorized shape by heating above the phase transition temperature. This phenomenon can be repeated any number of times.

  This phase transition point is a temperature at which the shape memory resin is deformed and then restored to its original shape. Although this shape memory resin is solidified while applying deformation stress above the partner transition point or deformed below the phase transition point, the shape memory resin remains the same shape, but the crystalline polyester polyol used as a raw material It is considered that the crystalline polyester portion is softened and restored to its original shape when the temperature is equal to or higher than the melting point, that is, the phase transition point or higher.

  Although it is general, rubbers and thermoplastics have a phase transition temperature. That is, it shows soft rubbery elasticity above a certain temperature, but below that temperature, the movement of the polymer chain freezes and solidifies, indicating a hard plastic shape. This temperature is called a phase transition point (glass transition point). In general, when a force at room temperature is applied, it is flexible and deforms well, but when the force is removed, the elastic body that returns to its original shape is called rubber. On the other hand, even if force is applied at room temperature, it is very difficult to deform, and it is impossible to forcibly deform it, but it can not be deformed, but its deformation rate is generally small, and it is hard to be broken or cracked when used for large deformation Is called plastic. Even if plastic can be deformed, it is difficult to restore the original shape.

  This phenomenon is caused by the fact that what is called rubber has a much lower phase transition temperature than normal temperature, and what is called plastic has a higher phase transition temperature than normal temperature. Due to

In general, a shape memory resin is a substance that deforms into a resin at a temperature lower than or equal to the phase transition temperature, and rubber at a temperature higher than or equal to the phase transition temperature. That is, the phase transition temperature of the shape memory resin is higher than room temperature. We found that the melting point of the crystalline polyester polyol used as a raw material becomes the phase transition point of a resin obtained by curing a crystalline urethane polymer reacted with a polyfunctional isocyanate, and that the shape memory resin deformed at this temperature is restored. Thus, the above embodiment has been conceived. In other words, the holding member 3 in the present embodiment has a mechanism for maintaining the shape at the time of curing when the cured resin is below the phase transition point. Further, when it is heated above the phase transition temperature, it has a property of returning to the cured original pattern.
Since the holding member 3 used for manufacturing the plastic lens for spectacles of the above embodiment is freely deformed with respect to the spectacle lens 5 at a temperature equal to or higher than the phase transition point, the holding member 3 is viewed from the horizontal as shown in FIG. The inclination angle θ (prism amount) is set, and the inclination angle θ is maintained by setting the temperature to be equal to or lower than the phase transition point.

[Embodiment 4]
Hereinafter, modifications other than the above-described embodiment will be described.
In the above embodiment, the case where the holding member 3 is matched with the shape of the convex portion of the lens 5 has been described. On the other hand, as shown in FIG. 7A, the holding member 3 may of course be matched with the shape of the concave portion of the lens 5.
Moreover, in said embodiment, the case where the yatoy 2 and the holding member 3 were separate was described. On the other hand, as shown in FIG. 7B, a lens holder 1 in which a yatoe 2 and a holding member 3 are integrally molded may be used. In addition, the Yatoi 2 may be divided into a plurality of members as in Patent Document 2, and can be attached to the lens processing apparatus with respect to the Yatoi 2 (lens holder 1) as in Patent Document 3. As such, an adapter may be provided separately.
Alternatively, the lens holder 1 may be attached to the lens 5 so as to cover the outer edge of the lens 5 as shown in FIG. By doing so, the lens 5 can be appropriately protected by the lens holder 1 when the lens 5 is processed, and it is possible to suppress an external force from being applied to the outer edge portion of the lens 5 by the processing tool. And the risk of damage to the lens holder 1 can be suppressed.

In the above-described embodiment, the case where the “predetermined shape” maintained by itself is a shape memorized shape has been described. On the other hand, after the E) holding step of the lens 5 is performed once, the shape of the holding member 3 when the G) holding member deforming step is performed again after the G) holding member 3 is restored to the original shape. Even if the shape has not been restored to its shape, it may be plastic.
Similarly, the shape that weakens the holding force in F) deblocking may be a shape that is not completely restored to the “predetermined shape” stored in the shape.
If the shape memorized shape is “predetermined shape”, <2. When the second cycle is performed after the lens holding method> is performed for one cycle, the “predetermined shape” may be updated and stored. That is, <2. The stored “predetermined shape” may continue to be updated each time the lens holding method> cycle ends.

  In the above-described embodiment, the case where the “predetermined shape” is a shape memory is described. On the other hand, if the lens holder 1 is divisible, a material having shape memory property may not be used for the holding member 3. C) The holding member 3 is certainly plastic to the extent that the holding member 3 is deformed in accordance with the optical surface of the lens 5 in the holding member deformation step. However, after that, plasticity is lost, and E) after the holding step is performed, plasticity may not be restored again. However, in this case, the lens holder 1 (at least the holding member 3) is likely to be disposable. On the other hand, since the holding member 3 has a shape reflecting the optical surface of the lens 5, as described above, the material 4a (UV curable resin) of the bonding member only needs to be applied thinly. Therefore, as a result, the usage amount of the material 4a of the bonding member in the lens holder 1 can be suppressed. In addition, as already described, the shape corresponding to the optical surface of the lens 5 can be formed simply and quickly. As a result, the plasticity is lost, and E) After the holding step is performed, the plasticity may not be restored again. Of course, it goes without saying that it is preferable to use a material having shape memory property for the holding member 3 from the viewpoint of the above-described recyclability and reduction of the amount of waste generated.

  In the above embodiment, the case where the “predetermined shape” is a shape stored in advance has been mainly described. Specifically, <2. B) of the lens holding method (blocking mechanism)> B) the shape α that the holding member 3 maintains by itself in the plastic development step (heating step), and G) the holding member 3 that is restored in the shape restoring step of the holding member. The case where the shape β is the same was mainly described. On the other hand, the shape α may be different from the shape β. As an example, after B) the holding member 3 which was in the shape α in the plastic development step (heating step) is subjected to C) holding member deformation step to F) deblocking, the shape β is different from the shape α. You may self-deform. Further, the second cycle lens may be held on the holding member 3 having the shape β.

  Although the case where the joining member 4 is provided has been described in the above embodiment, the joining member 4 may not be provided as long as the lens 5 can be retained by the plasticity of the retaining member 3. Further, a member in place of the joining member 4 may be used.

  The above embodiments relate to “lens holder”, “lens holding method”, and “lens manufacturing method”. Of course, the present invention is also applied to “lens manufacturing apparatus” employing the lens holder 1 described above. The idea of the invention is applicable. In addition, the idea of the present invention may be applied to a “lens holder with lens (particularly related to a plastic lens)”. It is considered effective for the lens provider to introduce a “lens holder with lens” to the market. In this way, the lens 5 as designed is produced while effectively suppressing the displacement of the lens 5 by simply mounting the “lens holder with lens” on the lens processing apparatus installed in the spectacle store or the like. It becomes possible. In addition, when the holding member 3 has a shape memory property that weakens the holding force as described in the above embodiment, deblocking can be easily, simply and reliably performed. Can do.

Furthermore, the idea of the present invention can be applied to the prism ring 7 itself. As a specific example, a prism ring 7 having an inclination corresponding to the amount of prisms in the lens 5, which has a plasticity while maintaining a predetermined shape by itself, under a predetermined condition, and the optical characteristics of the lens 5. The prism ring 7 is characterized in that it can be deformed in accordance with the shape of the surface, but the plasticity is lost under other predetermined conditions. More specifically, when the shape of the lens holder 1 is deformed in accordance with the shape of the optical surface of the lens 5, the holding member 3 is plastic while maintaining a predetermined shape by itself. When holding and solidifying a material for fixing between the yato 2 and the lens 5 such as alloy 8 or thermoplastic resin between them, the holding member 3 loses the plasticity, and the lens 5 There is a prism ring 7 that maintains a shape matched to the optical surface. Other details are the same as those of the holding member 3 of the above embodiment.
Certainly, in the lens holder 1 of the present embodiment, the holding member 3 also has the function of the prism ring 7. However, the prism ring 7 itself may be made of a material having the above properties (plastic expression and loss, shape memory property, etc.). In this way, even if the prism ring 7 has a predetermined shape (a prism amount different from the prism amount that the lens 5 has) at the beginning, the prism ring 7 is made to exhibit plasticity, and the lens 5 is connected to the prism ring. The amount of prism corresponding to the lens 5 can be reflected in the prism ring 7 by deforming the prism ring 7 by pressing against the prism 7. After that, the plasticity of the prism ring 7 is lost, and a material for fixing the gap between the lens 2 and the lens 5 such as alloy 8 or thermoplastic resin may be formed. This makes it possible to simply and quickly form a shape corresponding to the optical surface of the lens 5 with respect to the prism ring 7, and at the same time improve the situation where at least the prism ring 7 must be disposable. As a result, even if a substance having the above properties is used for the prism ring 7, the effect of the present invention can be exhibited. In that case, the alloy described in Patent Documents 1 to 3 may be used as one member of the lens 5 holding portion, or the thermoplastic resin described in Patent Document 4 may be used.

  Note that the idea of the present invention is not limited to the above-described embodiments and modifications, and those appropriately modified in design and the substances listed above (lens holder 1, prism ring 7, lens holder with lens 5). Needless to say, the methods other than 1) are applicable. In particular, the idea of the present invention is particularly applicable to a technique (for example, a polishing tool such as a balloon pad) having a precise optical surface such as the lens 5.

Hereinafter, other preferable modes will be additionally described.
[Appendix 1] (Manufacturing equipment)
A lens manufacturing apparatus having a lens holder provided with a holding member for holding a lens,
The holding member has plasticity while maintaining a predetermined shape by itself under predetermined conditions, and can be deformed according to the shape of the optical surface of the lens, while under other predetermined conditions. An apparatus for manufacturing a lens, wherein the plasticity is lost.
[Appendix 2] (Plastic lens manufacturing equipment)
A plastic lens manufacturing apparatus having a lens holder provided with a holding member for holding a plastic lens,
The holding member has plasticity while maintaining a predetermined shape by itself under predetermined conditions, and can be deformed in accordance with the shape of the optical surface of the plastic lens, while another predetermined condition. And an apparatus for producing a plastic lens, wherein the plasticity is lost.
[Appendix 3] (Lens holder with lens)
A lens,
A holding member for holding the lens;
Have
The holding member has plasticity while maintaining a predetermined shape by itself under predetermined conditions, and can be deformed according to the shape of the optical surface of the lens, while under other predetermined conditions. A lens holder with a lens, wherein the plasticity is lost.
[Appendix 4] (Lens holder with plastic lens)
A lens,
A holding member for holding the lens;
A bonding member provided between the holding member and the lens;
Have
The lens is a plastic lens having a UV shielding function,
A lens holder with a plastic lens, wherein the bonding member is a cured UV curable resin.
[Appendix 5] (Prism Ring)
A prism ring having an inclination according to the amount of prism in the lens,
If it is a predetermined condition, it has plasticity while maintaining a predetermined shape by itself, and it can be deformed according to the shape of the optical surface of the lens, while the plasticity is lost if it is another predetermined condition. A prism ring characterized by that.
[Appendix 6]
The lens holder according to claim 1, wherein the bonding member is a cured UV curable resin.
[Appendix 7]
The lens holder according to claim 1, wherein the predetermined condition is a condition related to temperature.
[Appendix 8]
The lens holder according to claim 1, wherein the lens is a plastic lens.
[Appendix 9]
A lens holder, wherein the plastic lens has a UV shielding function.
[Appendix 10] (Holding method)
A lens holding method using a lens holder provided with a holding member for holding a lens,
A holding member deformation step for deforming the holding member in accordance with the shape of the lens;
A holding step of holding the lens by the lens holder after the holding member deformation step;
Have
In the holding member deformation step, the holding member has plasticity while maintaining a predetermined shape by itself, and is deformable according to the shape of the optical surface of the lens, while in the holding step, The method for holding a lens, wherein the plasticity is lost.
[Appendix 11] (Plastic lens holding method)
A plastic lens holding method using a lens holder provided with a holding member for holding a plastic lens,
A holding member deformation step of deforming the holding member in accordance with the shape of the plastic lens having a UV shielding function;
UV curing resin provided on the holding member is cured by irradiating UV from the holding member side after the holding member deformation step, and joining the holding member and the plastic lens;
After the joining step, a holding step of holding the lens by the lens holder;
Have
In the holding member deformation step, the holding member has plasticity while maintaining a predetermined shape by itself, and is deformable according to the shape of the optical surface of the lens, while in the holding step, The plastic lens holding method, wherein the plasticity is lost.
[Supplementary Note 12] (Plastic Lens Manufacturing Method)
A plastic lens manufacturing method using a lens holder provided with a holding member for holding a plastic lens,
A holding member deformation step of deforming the holding member in accordance with the shape of the plastic lens having a UV shielding function;
UV curing resin provided on the holding member is cured by irradiating UV from the holding member side after the holding member deformation step, and joining the holding member and the plastic lens;
After the joining step, a holding step of holding the lens by the lens holder;
Have
In the holding member deformation step, the holding member has plasticity while maintaining a predetermined shape by itself, and is deformable according to the shape of the optical surface of the lens, while in the holding step, The plastic lens is characterized in that the plasticity is lost.
[Appendix 13] (Deblocking)
The holding member has a shape memory property, and maintains a shape that matches the optical surface of the lens under a predetermined condition, and self-deforms into a shape that weakens the holding force with respect to the lens under another predetermined condition. A lens holder characterized by that.
[Appendix 14] (Deblocking)
When the optical surface of the lens is convex, at least a part of the shape corresponding to the shape of the optical surface of the lens in the holding member is convex or flat, and the optical surface of the lens is concave. In this case, at least a part of the holding member corresponding to the shape of the optical surface of the lens has a concave or flat shape.
[Appendix 15] (Blocking & Deblocking)
A lens holder provided with a holding member for holding a lens,
The holding member has shape memory;
When deforming the shape of the lens holder according to the shape of the optical surface of the lens, the holding member has plasticity while maintaining a predetermined shape by itself,
While the lens is held by the lens holder, the holding member loses the plasticity and maintains a shape matched to the optical surface of the lens,
When removing the lens from the lens holder, the holding member self-deforms into a shape that weakens the holding force with respect to the lens.
[Supplementary Note 16] (Blocking & Deblocking Lens Manufacturing Method)
A lens manufacturing method using a lens holder provided with a holding member for holding a lens,
A holding member deformation step for deforming a holding member having shape memory property according to the shape of the lens,
A holding step of holding the lens by the lens holder after the holding member deformation step;
After the holding step, the detaching step of detaching the lens held by the lens holder from the lens holder by self-deforming the holding member into a predetermined shape that weakens the holding force with respect to the lens. When,
Have
In the holding member deformation step, the holding member has plasticity while maintaining a predetermined shape by itself, and is deformable according to the shape of the optical surface of the lens, while in the holding step, The method of manufacturing a lens, wherein the plasticity is lost.
[Supplementary Note 17] (Blocking & Deblocking Plastic Lens Manufacturing Method (UV))
A plastic lens manufacturing method using a lens holder provided with a holding member for holding a plastic lens,
A holding member deformation step for deforming the holding member having shape memory property in accordance with the shape of the plastic lens having the UV shielding function;
UV curing resin provided on the holding member is cured by irradiating UV from the holding member side after the holding member deformation step, and joining the holding member and the plastic lens;
After the joining step, a holding step of holding the lens by the lens holder;
After the holding step, the holding member self-deforms into a predetermined shape that weakens the holding force with respect to the plastic lens, so that the plastic lens held by the lens holder is detached from the lens holder. Separation process,
Have
In the holding member deformation step, the holding member has plasticity while maintaining a predetermined shape by itself, and is deformable according to the shape of the optical surface of the plastic lens, while in the holding step The method for producing a plastic lens, wherein the plasticity is lost.

  DESCRIPTION OF SYMBOLS 1 ... Lens holder, 2 ... Yatoi, 3 ... Holding member, 4 ... Joining member, 4a ... Material of joining member, 5 ... Lens, 6 ... Set screw, 7 ... Blocking ring (prism ring), 8 ... Alloy, 9 ... Protective film, 10 ... Mounting part

Claims (5)

A lens holder provided with a holding member for holding a lens,
The holding member has plasticity while maintaining a predetermined shape by itself under predetermined conditions, and can be deformed according to the shape of the optical surface of the lens, while under other predetermined conditions. A lens holder, wherein the plasticity is lost.   The lens holder according to claim 1, further comprising a joining member that joins the holding member and the lens.   The lens holder according to claim 2, wherein the predetermined shape is a shape that follows at least a part of an optical surface of the lens.   The lens holder according to claim 3, wherein the holding member is a resin composition having shape memory properties. A lens manufacturing method using a lens holder provided with a holding member for holding a lens,
A holding member deformation step for deforming the holding member in accordance with the shape of the lens;
A holding step of holding the lens by the lens holder after the holding member deformation step;
Have
In the holding member deformation step, the holding member has plasticity while maintaining a predetermined shape by itself, and is deformable according to the shape of the optical surface of the lens, while in the holding step, The method of manufacturing a lens, wherein the plasticity is lost.

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