JP2002187056A - Retaining method of a working jig and optical parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retaining method of a working jig and optical parts by which a datum plane and squareness in working can be accurately and easily obtained, and provide a method by which the optical parts can be fixed to the above working jig without using an alloy, wax or the like. SOLUTION: The working jig comprises a retaining face of almost the same shape as a face to be retained for the optical parts and a mounting portion for fitting to a working machine which works the optical parts. The working jig and the face to be retained for the optical parts are bonded by an adhesive agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing jig capable of fixing an optical component such as a lens and mounting the same on a processing apparatus, and a method of holding the optical component.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2 (a), in a polishing step of an optical component such as an eyeglass lens, a low melting point alloy generally known as an alloy, which is a well-known technique, is combined with an alloy molding ring 12 as shown in FIG. The optical component 9 and the holder 10 are poured into the space formed by the holder 10 and the optical component 9, and the opposite surface (hereinafter, referred to as an adhesive surface) of the processing surface of the optical component is fitted thereto. It is bonded and fixed via the low melting point alloy 11. The processing jig 10 to which the optical component 9 is fixed is mounted on a polishing apparatus, and the optical component 9 is polished.

In order to pour the alloy into the processing jig, a furnace having a heater is equipped, and the alloy is heated to a temperature higher than the melting point until the alloy is fluidized, and the alloy is evenly adhered to the bonding surface of the optical component to be processed. For this purpose, it is necessary to use a device for adjusting the pouring amount manually, and this is performed manually or semi-automatically. In addition, this alloy can be fluidized in water heated to its melting point or higher, and has a specific gravity of about 10 times that of water. Therefore, it can be recovered by separating and immersing in the water. By returning to the furnace, the regeneration becomes possible.

[0004]

However, in order to use an alloy, which is a low melting point alloy shown in the prior art, and to have a holding force enough to cope with the processing resistance in the polishing process, as described above, It is necessary to pour an alloy having a capacity corresponding to the shape of the bonding surface of the optical component such as an eyeglass lens, which is a processed product, with a processing jig, and when this capacity adjustment is manual, it requires a skill. If the alloy is poured into the processing jig more than necessary, the processing surface of the optical component to be processed will be in a state of floating from the processing jig, so it may not be possible to polish the designed surface shape .

[0005] In addition, the reference plane in the polishing process is the parallelism of the end face 13 of the block layer made of the alloy and the linearity of the cylindrical portion 14 of the holder 10 shown in FIG. A squareness of the surface is required. However, since the holder and the block layer are made separately, it is very difficult to strictly control the fixing accuracy between the block layer and the holder, that is, to obtain the squareness.

[0006] The alloy, which is a low melting point alloy, generates stress when it shrinks. By storing this stress as an internal stress in the optical component, the optical component is gripped, that is, bonded. Therefore, in order to control the stress during shrinkage of the alloy itself, it is important to control the composition of the alloy, and it is also necessary to periodically check the composition of the alloy to be recycled. If this component management is neglected, the stress due to the shrinkage of the alloy will vary, so that the bonding accuracy will be unstable, and the shape change of the optical component before and after bonding will be very large. In order to absorb this variation, a method of increasing the thickness of the optical component more than necessary to increase the rigidity of the optical component has been adopted. However, this increases the number of raw materials used and hinders cost reduction.

[0007] In addition, since the dirt and foreign matters adhering to the inside of the holder do not fall off during the alloy regeneration step, a separate washing step is required, which is a burden.

Also, in order to improve the adhesion between the alloy and the optical component, it is necessary to attach a protective tape or the like on the bonding surface of the optical component, and the processing steps must be performed in advance.

[0009] In order to regenerate the alloy, the alloy that has been adhered to the holder must be separated together with the holder in water heated to a temperature higher than the melting point of the alloy.

[0010] Further, the alloy, which is a low-melting-point alloy, contains 20% or more of lead as a component, and it is desired that a lead-free alloy, which has recently been taken up as an environmental problem, be promptly replaced.

In recent years, a wax material has been used in place of an alloy in the same manner. However, in this method, it is necessary to adjust the peripheral temperature of the wax and the jig in order to stabilize the adhesive force and the holding force of the wax.

The present invention has been made in view of the above circumstances, and provides a processing jig capable of improving processing accuracy and a method for holding an optical component capable of fixing an optical component without using an alloy or wax. Aim.

[0013]

The inventor of the present invention has conducted intensive studies to achieve the above object, and as a result, has found that a holding surface having substantially the same shape as a held surface of an optical component, and a processing for processing the optical component. It has been found that it is effective to use a processing jig provided with a mounting portion for mounting on a machine.

In other words, according to this configuration, the block layer and the holder, which were individually formed in the prior art, are integrally manufactured, so that the reference plane and the squareness in the processing can be accurately and accurately determined. Can be easily obtained.

It has also been found that it is effective to provide an adhesive layer between the holding surface of the processing jig and the held surface of the optical component and bond them together.

That is, by using a liquid type or sheet type adhesive, not only can the optical component be accurately fixed without using an alloy or a wax, but also the shrinkage stress of the alloy or the wax does not occur. Can be kept to a minimum. As a result, it is also possible to reduce the raw material cost of the optical component. In addition, it goes without saying that all of the incidental work such as component management and adjustment of the ambient temperature required when using the alloy or wax can be eliminated.

Further, the present invention also addresses lead-free, which is an environmental problem.

Further, if necessary, a protective film layer may be provided between the adhesive layer and the surface to be held to prevent the occurrence of scratches. The protective film layer does not necessarily need to have an adhesive, but by arranging the adhesive on the side where the held surface of the optical component is in contact, the held surface of the optical component can be securely bonded.

Further, if the pressure-sensitive adhesive provided on the adhesive layer or the protective film layer is of a water-soluble type, the optical component and the processing jig can be easily peeled off only by washing with water after the processing is completed.

In addition, the use of the instant adhesive makes it possible to fix the device in a short time and with high precision.

Therefore, the first aspect of the present invention is characterized in that it comprises a holding surface having substantially the same shape as the held surface of the optical component, and a mounting portion for mounting the optical component on a processing machine. And a processing jig.

According to a second aspect of the present invention, there is provided a method for holding an optical component, comprising an adhesive layer between the holding surface of the processing jig and the held surface of the optical component. I do.

According to a third aspect of the present invention, there is provided the optical component holding method according to the second aspect, wherein the adhesive layer is made of a liquid type adhesive.

According to a fourth aspect of the present invention, there is provided the optical component holding method according to the second aspect, wherein the adhesive layer is made of a sheet type adhesive.

According to a fifth aspect of the present invention, in the method for holding an optical component according to any one of the second to fourth aspects, a protective film layer is provided between the adhesive layer and a surface to be held of the optical component. And a method for holding an optical component.

According to a sixth aspect of the present invention, in the method for holding an optical component according to the fifth aspect, the protective film layer comprises:
Provided is a method for holding an optical component, characterized by having an adhesive at least on a side of the optical component on which the held surface contacts.

According to a seventh aspect of the present invention, there is provided the optical component holding method according to the sixth aspect, wherein the adhesive of the protective film is water-soluble.

According to an eighth aspect of the present invention, there is provided the optical component holding method according to any one of the second to seventh aspects, wherein the adhesive layer is made of a water-soluble adhesive. I do.

According to a ninth aspect of the present invention, there is provided the optical component holding method according to any one of the second to seventh aspects, wherein the adhesive layer is made of an instant adhesive. .

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments.

The processing jig according to the present invention includes a holding surface having substantially the same shape as the held surface of the optical component, and a mounting portion for mounting the optical component on a processing machine for processing the optical component.

The workpiece to be fixed and held by the processing jig of the present invention has a smooth surface that is in close contact with the holding surface of the processing jig and can be processed by a processing machine.
Both are eligible. In particular, an optical material such as a lens material having a spherical surface or an aspherical curved surface for forming a lens by polishing is particularly suitable, and a plastic spectacle lens having a non-processed surface having a spherical surface or an axisymmetric aspherical shape is particularly suitable. It is preferable that the holding surface of the processing jig is the same as the holding surface of the optical component to be processed or a shape in consideration of the thickness of the adhesive layer and the protective film layer. Further, since the holding surface of the processing jig is required to be smooth and light, it is preferable to use aluminum, duralumin, ceramic, or the like, which is relatively easy to obtain a mirror surface. Further, the processing jig of the present invention integrally manufactures a mounting portion for attaching to a processing machine that processes an optical component and a holding surface. For example, by processing with the same reference using a lathe or the like, the positional relationship between the holding surface and the mounting portion can be made with high accuracy, so that an extremely high-precision reference surface can be obtained.

Next, regarding the adhesive layer, when the optical component of the workpiece has a curved surface shape, the liquid type is suitable. If there is an adhesive strength that penetrates evenly between the holding surface of the processing jig and the holding surface of the optical component or the protective film layer that protects the holding surface of the optical component, and that does not peel during processing, It may be something like Considering productivity, a quick-drying adhesive such as an instant adhesive is suitable, and a water-soluble adhesive is preferable if emphasis is placed on the workability of peeling after completion of processing. As the instant adhesive, an instant adhesive containing alpha cyanoacrylate as a main component is preferable. A typical example is Aaron Alpha (trade name, manufactured by Toagosei Co., Ltd.). The thickness of the adhesive layer of the instant adhesive is preferably 1 to 300 μm. Examples of the water-soluble adhesive include vinyl monomers having a hydrophilic group such as acrylic acid, acrylic acid ester, acrylic acid amide, and itaconic acid disclosed in JP-A-58-162885. Or a copolymer of the above monomer with vinyl acetate, styrene or the like. The thickness of the water-soluble adhesive layer is preferably from 1 to 500 μm. When the optical component to be processed has a planar shape, a sheet-type adhesive layer such as a double-sided tape can be selected in addition to the liquid type. There is no particular limitation as long as the surface to be held and the optical component having a planar shape can be uniformly adhered and the adhesive strength does not peel during processing. Of course, a sheet type adhesive layer can also be selected as long as the optical component of the workpiece has a curved surface shape, as long as the optical component is of a type that adapts to the curved surface.

Regardless of the adhesive used, the area required for the adhesive layer may be a part or the whole of the holding surface as long as the adhesive strength that does not peel during processing can be obtained.

Next, the protective film layer is not particularly limited as long as it has an adhesive strength that conforms to the surface shape of the held surface of the optical component and does not peel off during processing.
A typical example is a blue tape manufactured by Sumitomo 3M Limited. The thickness of the protective film layer is preferably 1 to 200 μm including the pressure-sensitive adhesive. The area required for the protective film layer may be only the holding surface portion or the entire holding surface in consideration of the properties such as the adhesive used and the material of the optical component.

FIG. 1A is a sectional view of an embodiment of the processing jig of the present invention. The processing jig 1 is used for bonding and holding the lens material 6 and cutting, grinding, or polishing the lens material 6 with a polishing processing device to process the lens material 6 into a completed lens.

The processing jig 1 is made of a metal such as aluminum, and includes a holding surface 3 having substantially the same shape as the held surface 7 of the lens material 6 and a mounting portion 2 for attaching to a processing machine.

Next, FIG. 1B is a sectional view showing a case where the lens material 6 is bonded to the processing jig 1. In the present embodiment, the held surface 7 of the lens material 6 has a spherical shape,
In conformity with this, the holding surface 3 of the processing jig 1 also has a spherical shape with substantially the same radius of curvature as the held surface 7. The protective film layer 4 uses a blue tape manufactured by Sumitomo 3M Co., Ltd. having an adhesive on the lens material side, and the adhesive layer 5 uses Alon Alpha 221 manufactured by Toagosei Co., Ltd. did.

Specifically, first, Alon Alpha 221 is used in an amount necessary to obtain an adhesive strength that does not peel during processing.
Was dropped onto the holding surface 3 of the processing jig 1, and the held surface 7 of the lens material 6 was positioned and set on the holding surface 3 of the processing jig 1. After setting, Aaron Alpha 221 spread evenly over the entire holding surface 3, and Aaron Alpha 221 was cured in about 10 seconds to complete the bonding. Thereafter, grinding and polishing were performed by a polishing apparatus, but the processing was completed without peeling during the processing.

In addition, almost no stress is generated by bonding with an adhesive. For example, when Alon Alpha 221 was used, the amount of change in the shape of the lens material before and after bonding was about 30 to 60% as compared with that of the alloy, so that the lens material could be manufactured using the minimum necessary raw materials.

[0041]

According to the processing jig of the present invention, it is possible to accurately and easily obtain a reference plane and a perpendicularity in processing.

Further, according to the method for holding an optical component of the present invention, the optical component can be fixed to the processing jig without using an alloy or wax.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing an embodiment of a processing jig of the present invention, and FIG. 1B is an example of an adhesive form of a method for holding an optical component of the present invention. It is sectional drawing.

FIG. 2 is a cross-sectional view showing a conventional processing jig and a bonding form using the same, FIG. 2 (a) is a cross-sectional view showing a state in which an alloy is poured, and FIG. FIG. 14 is a cross-sectional view showing a state in which is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing jig 2 Mounting part 3 Holding surface 4 Protective film layer 5 Adhesive layer 6 Lens material 7 Holding surface 9 Optical component 10 Holding tool 11 Low melting point alloy 12 Alloy forming ring 13 End face of block layer 14 Cylindrical part of holding tool

Claims (9)

[Claims] 1. A processing jig comprising: a holding surface having substantially the same shape as a held surface of an optical component; and a mounting portion for mounting the optical component on a processing machine that processes the optical component. 2. A method for holding an optical component, comprising an adhesive layer between a holding surface of the processing jig according to claim 1 and a held surface of the optical component. 3. The method for holding an optical component according to claim 2, wherein the adhesive layer is made of a liquid type adhesive. 4. The method for holding an optical component according to claim 2, wherein the adhesive layer is made of a sheet-type adhesive. 5. The optical component holding method according to claim 2, further comprising a protective film layer between the adhesive layer and a surface of the optical component to be held. Method. 6. The method for holding an optical component according to claim 5, wherein the protective film layer has an adhesive at least on a side of the optical component in contact with a held surface of the optical component. 7. The method for holding an optical component according to claim 6, wherein the adhesive of the protective film is water-soluble. 8. The method for holding an optical component according to claim 2, wherein the adhesive layer is made of a water-soluble adhesive. 9. The method for holding an optical component according to claim 2, wherein the adhesive layer is made of an instant adhesive.