JPH10337644A - Holding method and holder of lens for spectacles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a high quality polished lens by integrally molding a holding part to be held on a working device etc., and to be a standard for working, a protective layer of a surface not to be used of a semi-finished lens and a block layer to adhere and fix the semi-finished lens of a block material of the same material by using a forming mold. SOLUTION: A semi-finished lens 1 is integrally molded by using a forming mold capable of integrally molding a holding part through a block layer and pouring wax 2 as a block material into a cavity formed between this forming mold and the semi-finished lens 1. Thereafter, shape generation is carried out in a desired shape with a block layer 5 provided outside of an extreme outer peripheral part of the semi-finished lens 1 by a form generating means, and a so-called protector 6 is simultaneously made. Continuously, a desired optical surface is precisely finished by applying polishing by a polishing means. Thereafter, finally, the wax 2 and a lens 7 finished with polishing work are separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for holding a spectacle lens when polishing a spectacle lens, and a polishing method using the same.

[0002]

2. Description of the Related Art Conventional polishing of spectacle lenses is disclosed in
As shown in -14776, a spectacle lens (hereinafter, referred to as a semi-finished lens) which is thicker than a finished dimension and which is generally called a semi-finished lens before polishing (hereinafter referred to as a semi-finished lens) is a low melting point alloy which is generally called an alloy. (Hereinafter, referred to as an alloy) and fixed to a holder for polishing, and after rough-cutting the semi-finished lens fixed to the holder to a substantially desired shape according to the prescription of the wearer,
Sanding and polishing similar to lapping are applied,
2. Description of the Related Art Precision finishing of an optical surface of a lens is performed.
After the polishing process is completed, the lens and the alloy are separated by applying an impact to the alloy portion to obtain a spectacle lens. In addition, since the alloy and the holder for polishing are recycled and used,
Depending on the amount to be treated each time, the alloy and the holder for polishing are separated by immersing the alloy in hot water at a temperature at which the alloy dissolves for several minutes to several tens of minutes. Further, the holder for polishing is cleaned to remove dirt and adhered alloy when grinding and polishing are performed. The non-finished surface of the semi-finished lens is fixed to a holder for polishing via a block layer of an alloy for positioning as a reference during polishing. The holder for polishing is dedicated to the holder, and is generally made of aluminum, duralumin, or the like. Furthermore, when the lens is made of plastic, the non-processed surface of the plastic lens is protected with a tape or a film or the like in order to prevent the lens from being scratched during polishing, and a block layer made of the alloy is formed thereon. It is structured and fixed to a holder for polishing. Therefore, it has a three-layer structure as shown in FIG. In addition, the holder for polishing also has a role as a processing reference at the time of polishing.

[0003]

However, in the method of polishing a spectacle lens shown in the above prior art, first, a holder for polishing is required exclusively, and a considerable amount of the holder is required for mass production. It is necessary to keep. Also, in order to add a different prism amount to the lens depending on the prescription and to play a role as a mold for pouring the alloy, a special jig (hereinafter referred to as a block ring) generally called a block ring is provided for each lens according to its refractive index and model. About 10 to 100 pieces had to be owned. Second, the holder needs to be washed after separation from the alloy in order to be recycled and used. In addition, the holder may be deformed due to bumping between the holders or between the holder and the processing device when polishing or cleaning the holder, so that the holder is accurately chucked when set in the processing device. Was a cause of making defective products. In addition, the reference surface in the polishing process is the end surface 10 of the block layer made of the alloy shown in FIG.
The parallelism and the linearity of the cylindrical portion 11 of the holder and the perpendicularity of these two reference planes are required. However, since the block layer made of the alloy and the holder is separate, the fixing between the block layer and the holder is required. It is difficult to precisely control the accuracy. Third, when the lens is made of plastic, a protective layer is formed on the non-processed surface of the plastic lens with a film or tape to prevent scratches on the lens during polishing. It is necessary to peel off the protective layer from the plastic lens. Further, in the case of a plastic lens, although the deformation due to the stress during polishing is greater than that of a glass lens, a block layer made of an alloy is applied only to a part of the non-processed surface of the lens as shown in FIG. This is a major factor in lens deformation. Further, since a block layer made of an alloy is provided only on a part of the non-processed surface of the lens, it is impossible to correct a defect in appearance called polishing sagging of the outer peripheral portion of the lens. As described above, many steps are required only for fixing and separating the lens to the holder, which not only causes an increase in cost, but also has many problems such as a deterioration in quality such as deformation of the lens and polishing dripping. Was.

Accordingly, the present invention has been made to eliminate such a problem, and firstly, a dedicated holder is not required. Therefore, the cleaning of the holder, which is conventionally required, is not required. In addition, since the holders are not deformed due to the collision of the holders at the time of cleaning, the chuck accuracy when setting in the processing apparatus can be stably obtained. In addition, since the block layer and the holder are integrally formed without using the holder, a reference surface for processing during polishing can be obtained with high precision and ease.

Secondly, since a protective layer on the non-processed surface, which is required when the lens is made of plastic, is not required, it is possible to omit an additional step of attaching a protective tape and peeling off the protective tape. In addition, since the occurrence of scratches that are likely to occur at that time can be reduced to zero, it is possible to improve the yield and reduce costs by reducing the number of steps.

Further, by providing a block layer also on the entire non-processed surface of the lens and outside the outermost peripheral portion of the semi-finished lens, not only the deformation of the lens, which has been a problem in the past, can be suppressed, but also the outer peripheral portion of the lens. Because it is possible to impregnate the polishing sag generated in the above-mentioned block layer,
It is an object of the present invention to provide a method for inexpensively manufacturing a high-quality polished lens that cannot be obtained by the conventional technique, for example, it is possible to manufacture a lens without polishing sag which is a defect in appearance.

[0007]

According to the present invention, there is provided a method for holding an eyeglass lens in a polishing process, comprising: a holding portion gripped by a processing device and serving as a reference for processing; The protection layer on the non-use surface of the spectacle lens before processing and the block layer for bonding and fixing the spectacle lens are integrally formed of a block material of the same material.

In a holding method for polishing a spectacle lens at the time of polishing, a holding portion which is gripped by a processing device or the like and serves as a reference for processing, a protective layer for a non-use surface of the spectacle lens before polishing, and In the holding method in which the block layer for bonding and fixing the spectacle lens is integrally formed with a block material of the same material, the spectacle lens is included in the block layer for bonding and fixing the spectacle lens. I do.

In the method for holding a spectacle lens during polishing, a holding portion which is gripped by a processing device or the like and serves as a reference for processing, a protective layer for a non-use surface of the spectacle lens before polishing, and In the method for holding a spectacle lens, wherein the block layers for bonding and fixing the spectacle lens are separately formed, the spectacle lens is included in the block layer for bonding and fixing the spectacle lens. It is characterized by the following.

[0010] Further, in a holder used during polishing of the spectacle lens, a holding portion which is gripped by a processing device or the like and serves as a reference for processing, a protective layer on a non-use surface of the spectacle lens before polishing, Further, a block layer for bonding and fixing the spectacle lens is integrally formed of a block material of the same material.

[0011] Further, in the holder used for polishing the spectacle lens, a holding portion which is gripped by a processing device or the like and serves as a reference for processing, a protective layer for a non-use surface of the spectacle lens before polishing, And in the method for holding the spectacle lens, wherein the block layer for bonding and fixing the spectacle lens is separately formed, wherein the spectacle lens is included in the block layer for bonding and fixing the spectacle lens. It is characterized by being.

Further, in the method of polishing a spectacle lens, any one of the above-described methods for holding a spectacle lens is used.

[0013] In a method of polishing a spectacle lens, any one of the holders described above is used.

According to the above configuration of the present invention, at the time of polishing, a holding unit which is gripped by a processing device or the like and serves as a reference for processing,
And a protective layer on the non-use surface of the spectacle lens before polishing, that is, the semi-finished lens, and a block layer for bonding and fixing the semi-finished lens are integrally molded with a block material of the same material using a molding die. The holder itself becomes unnecessary. In addition, as the block material, generally used alloys including commercially used waxes, photocurable resins, beeswax, pitch, resins such as hot melt, etc., have adhesive strength and some formability, and processing equipment. It is not specified as long as it has a strength that can withstand a gripping force or a force applied during processing after molding, and has a property of being easily melted by heat or the like at the time of separation after processing.
Therefore, a dedicated holder and cleaning of the holder, and a protective layer on the non-processed surface, which is required in the case of a plastic lens, are not required. Further, since the holder and the block layer are integrally formed by a molding die, in the related art, the parallelism of the end face 10 of the block layer made of an alloy and the linearity of the cylindrical portion 11 of the holder shown in FIG. The perpendicularity between the two reference planes can be easily obtained, and the chuck accuracy of the processing apparatus can be improved. Further, conventionally, since there was no block layer at the outermost peripheral portion of the semi-finished lens, polishing sagging, which is a defect in appearance, occurred at the outermost peripheral portion of the polished lens. For example, the provision of the block layer 6 provided on the entire non-processed surface of the semi-finished lens and outside the outermost peripheral portion of the semi-finished lens not only suppresses the deformation of the lens, which has been a problem in the past, but also reduces the problem of FIG. As shown in the figure, when the shape is created before polishing, the semi-finished lens is cut into a desired shape together with the semi-finished lens, which plays the role of a toy. Therefore, the polishing sag generated during the polishing process is a block layer provided outside the outermost periphery of the lens. 6 and does not remain on the outermost peripheral portion of the lens after polishing.
From the above, a high-quality polished lens that could not be obtained by the conventional technology can be provided at low cost.

[0015]

1 and 2 are views showing a work in which a semi-finished lens is blocked by the structure of the present invention. Hereinafter, embodiments will be described with reference to these drawings, but the present invention is not limited to these embodiments.

(Embodiment 1) In this embodiment, a method for holding a semi-finished lens and a polishing method using the same when a plastic spectacle lens is manufactured by polishing will be described. First, although not shown, a molding die capable of integrally molding from the holding portion to the block layer according to the shape of the chuck portion of the processing device is used.
A commercially available wax 2 as a block material was poured into the cavity formed between the semi-finished lens 1 and the semi-finished lens 1 according to the constitution of the present invention as shown in FIG. This state is collectively called a work.
In this embodiment, since the amount of prism to be added to the lens was 0, the semi-finished lens 1 and the reference surface 4 of the workpiece chucked by the processing device were positioned in advance so as to be parallel. Needless to say, if the prism amount is not 0, an arbitrary prism amount can be added to the lens if a predetermined angle is provided at the time of positioning the mold and the semi-finished lens 1. Further, the holding portion 3 of the work composed of the wax 2 has a strength enough to withstand the gripping force of the processing device and the force applied during the processing, and the forming accuracy of the reference surface 4 of the work is required for the processing. Was satisfied with the accuracy. Further, when blocking, no protective layer was provided on the non-use surface of the semi-finished lens 1, in this embodiment, the convex surface of the lens.

Thereafter, as shown in FIG. 2, a desired shape is created by a shape creating means (not shown) together with the block layer 5 provided outside the outermost peripheral portion of the semi-finished lens 1, so-called a toy 6 is simultaneously created. . Subsequently, polishing was performed by a polishing means to precisely finish a desired optical surface. Finally, when the workpiece is immersed in hot water of about 80 degrees for about 5 minutes to separate the wax 2 and the lens 7 after polishing, the lens 7 and the wax 2 can be completely separated. Was. Particularly, in the conventional method, polishing sagging, which had always occurred, was not confirmed at the outermost peripheral portion of the lens, and no scratch on the non-use surface of the lens 7 was also confirmed, so that a lens having a defect-free appearance could be obtained. Also, since the deformation of the lens, which has been a problem in the past, is so small as to be negligible, it goes without saying that the accuracy of the lens power and the accuracy of the prism have been improved as compared with the prior art. The wax 2 was collected and used when blocking another lens.
Further, in this embodiment, the holding portion which is gripped by the processing device or the like and serves as a reference for processing, the protective layer on the non-use surface of the semi-finished lens, and the block layer for bonding and fixing the semi-finished lens are waxed using a molding die. Although the two parts were integrally formed, almost the same results could be obtained by partially changing the shape of the mold and replacing only the holding part with a dedicated holding tool used in the prior art, and performing two-piece molding. Needless to say.

Example 2 The same lens polishing was performed by changing the block material of Example 1 from wax to an alloy, and a high-quality defect-free lens almost similar to that of Example 1 could be obtained.

However, since the alloy is an expensive block material, the alloy shaved off by the shape creating means together with the semi-finished lens is collected by a centrifugal separator or the like and reused together with the alloy that has been polished and separated from the alloy. .

[0020]

As described above, according to the present invention, during polishing, a holding unit which is gripped by a processing device or the like and serves as a reference for processing, a protective layer on a non-use surface of a semi-finished lens, and a semi-finished lens. Since a block layer for bonding and fixing the finish lens is integrally formed with a block material of the same material using a molding die, a dedicated holder itself is not required.
Therefore, not only special holding tools, but also block rings,
Cleaning of the protective layer and the holder on the non-processed surface, which is required in the case of a plastic lens, is not required. Further, since the holder and the block layer are integrally formed by a molding die, the precision of forming the reference surface can be easily obtained, and the precision of the chuck of the processing apparatus can be improved. Further, conventionally, since there was no block layer at the outermost peripheral portion of the semi-finished lens, polishing sagging, which is a defect in appearance, occurred at the outermost peripheral portion of the lens, but according to the configuration of the present invention, The block layer provided on the entire non-processed surface and outside the outermost peripheral portion of the lens not only suppresses the deformation of the lens, which has been a problem in the past, but also
As shown in FIG. 2, when the shape is created before polishing, the semi-finished lens is created into a desired shape together with the semi-finished lens, and plays a role of a so-called toy. Therefore, the polishing sag does not remain on the outermost peripheral portion of the lens. Therefore, a high-quality polished lens, which could not be obtained by the conventional technique, can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a work in which a semi-finished lens is held and blocked according to the configuration of the present invention.

FIG. 2 is a diagram showing a state in which polishing has been completed in one embodiment of the present invention.

FIG. 3 is a diagram showing a work in which a semi-finished lens and a holder for polishing are blocked in a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Semi-finished lens 2 Wax 3 Work holding part 4 Work reference plane 5 Block layer provided outside the outermost peripheral part of semi-finished lens 6 Thread 7 Polished lens 8 Block layer made of alloy 9 Polishing Holder 10 End face of block layer 11 Cylindrical part of holder 12 Protective film

Claims (7)

[Claims] 1. A method for holding a spectacle lens at the time of polishing, the holding portion being gripped by a processing device or the like and serving as a reference for processing, a protective layer for a non-use surface of the spectacle lens before the polishing, and A method for holding a spectacle lens, wherein a block layer for adhering and fixing the spectacle lens is integrally formed of a block material of the same material. 2. The method for holding a spectacle lens before polishing according to claim 1, wherein the spectacle lens is included in a block layer for adhering and fixing the spectacle lens. How to hold a lens. 3. A method for holding a spectacle lens at the time of polishing, wherein the holding portion is gripped by a processing device or the like and serves as a reference for processing, a protective layer for a non-use surface of the spectacle lens before the polishing, and In the method for holding a spectacle lens, wherein the block layers for bonding and fixing the spectacle lens are separately formed, the spectacle lens is included in the block layer for bonding and fixing the spectacle lens. A method for holding a spectacle lens. 4. A holder for use in polishing a spectacle lens, wherein the holder is gripped by a processing device or the like and serves as a reference for processing, and a protective layer on a non-use surface of the spectacle lens before polishing. And a block layer for bonding and fixing the spectacle lens integrally formed of a block material of the same material. 5. A holder for use in polishing a spectacle lens, wherein the holder is gripped by a processing device or the like and serves as a reference for processing, and a protective layer on a non-use surface of the spectacle lens before polishing. And in the method for holding the spectacle lens, wherein the block layer for bonding and fixing the spectacle lens is separately formed, wherein the spectacle lens is included in the block layer for bonding and fixing the spectacle lens. A holding tool. 6. A method for polishing a spectacle lens, comprising using the method for holding a spectacle lens according to claim 1 in a method for polishing a spectacle lens. 7. A method for polishing a spectacle lens, comprising using the holder according to claim 4 or 5.