JP2002086327A - Processing jig - Google Patents

Abstract

(57) [Problem] To provide a processing jig capable of fixing a workpiece without using an adhesive medium such as an alloy or wax. SOLUTION: A ring-shaped seal portion 24 that is in close contact with a workpiece 100, a reduced-pressure gap 6 in which the workpiece 100 is in close contact with the seal portion 24 to form a sealed space; 5 that can shut off and open communication with the
And a mounting jig 1 for mounting the workpiece 100 on a processing machine that processes the workpiece 100.

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 a workpiece such as a lens and mounting the same on a processing apparatus.

[0002]

2. Description of the Related Art Conventionally, in a polishing process of an optical component such as an eyeglass lens, a low melting point alloy generally called an alloy, which is a well-known technique, is poured into a processing jig, and a surface opposite to a processing surface of the optical component ( The optical component 100 and the processing jig 111 are bonded and fixed via the low melting point alloy 112 as shown in FIG. A processing jig 111 to which the optical component 100 is fixed is mounted on a polishing apparatus, and the optical component 100 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.

Further, this alloy can be fluidized in water heated to a temperature higher than its melting point, and has a specific gravity of about 10 times that of water. By returning to the furnace of the pouring device, regeneration becomes possible.

[0005]

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 .

The alloy, which is a low-melting alloy, is largely involved in the control of the rigidity of the optical component during the processing of the optical component due to the adhesive force between the optical component and the processing jig and the stress caused by the shrinkage of the alloy itself. Therefore, it is necessary to check the components of alloys that are regularly recycled.

In addition, since a dirt and foreign matter adhered to the inside of the processing jig are not removed even in the alloy regenerating process, a separate cleaning process is required.

In order to improve the adhesion between the alloy and the optical component and to protect the adhesive surface of the optical component from scratches, it is necessary to attach a protective tape or the like on the adhesive surface of the optical component. The processing steps must be performed in advance. Further, since the protective tape is peeled off after the polishing process, an extra material cost is required. Further, after the polishing process is completed, in order to separate the optical component 100 and the processing jig 111 by applying a shock by inserting a wedge or the like between the bonding surface of the optical component 100 and the alloy 112,
The processed optical parts may be damaged.

[0009] In order to regenerate the alloy, it is necessary to separate the alloy, which has been adhered in the processing jig, together with the jig 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 instead of an alloy, but this method requires adjustment of the peripheral temperature of the wax and the processing 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 has as its object to provide a processing jig capable of fixing a workpiece without using an adhesive medium such as an alloy or wax.

[0013]

In order to achieve the above object, according to the present invention, a ring-shaped seal portion which is in close contact with a workpiece, and wherein the workpiece is in close contact with the seal portion. A depressurized gap that forms a sealed space, and a valve that can shut off and open the communication between the depressurized gap and the outside,
And a mounting part for mounting the workpiece on a processing machine that processes the workpiece.

In this processing jig, a workpiece is brought into close contact with a seal portion, a decompression source and a decompression gap are connected through an opened valve, and the decompression gap is decompressed to form the workpiece on the seal portion. Can be held by suction, the valve is closed in this state, the depressurized space is sealed, and the mounting portion is mounted on a processing machine to process the workpiece.

According to a second aspect of the present invention, in the processing jig of the first aspect, when the pressure in the depressurized space is lower than that of the outside, the valve communicates with the depressurized space. A processing jig is provided which is a check valve that shuts off and opens communication between the depressurized gap and the outside when the pressure in the depressurized gap is higher than the outside.

By using a check valve as a valve for shutting off and opening the communication between the depressurized space for holding the workpiece by being depressurized and holding and the outside, the depressurized space is automatically sealed to reduce the pressure. Can be reliably maintained.

According to a third aspect of the present invention, in the processing jig according to the first or second aspect, the depressurized air gap that is normally depressurized is cut off from the outside, and the depressurized air gap when necessary. And a vacuum break valve for communicating the outside with the outside.

The processing jig can be easily opened by releasing the vacuum release valve and introducing air from the outside into the depressurized space when releasing the suction holding of the workpiece.

According to a fourth aspect of the present invention, there is provided the processing jig according to the third aspect, wherein the check valve also serves as the vacuum breaking valve.

For example, a check valve can be forcibly pulled from the outside to break it in a vacuum, so that the check valve can also be used as a vacuum breaking valve.

According to a fifth aspect of the present invention, in the processing jig according to any one of the first to fourth aspects, the seal portion includes:
A processing jig characterized by being constituted by packing is provided.

By forming the seal portion with packing, it is possible to reliably maintain the reduced pressure in the reduced-pressure gap portion and to prevent the workpiece from being damaged.

According to a sixth aspect of the present invention, in the processing jig according to any one of the first to fifth aspects, the suction surface of the workpiece is disposed in the depressurized space and surrounded by the seal portion. A receiving jig for contacting a part or the whole of the processing jig, and a processing jig comprising a spacer interposed between the suction surface and a surface opposed to the suction surface in the decompression cavity. provide.

By bonding an adhesive medium such as an alloy to the workpiece, the workpiece itself integrated with the workpiece has rigidity. However, vacuum suction forms a depressurized void portion of the workpiece. Since the suction surface floats from the processing jig and has a certain degree of freedom, the rigidity decreases,
The workpiece may be deformed by a processing load such as a polishing process, and the processing as designed may not be realized. However, by interposing a spacer between the suction surface of the workpiece and the processing jig in the depressurized space, the processing load applied to the workpiece can be received by the spacer. And processing as designed becomes possible.

According to a seventh aspect of the present invention, in the processing jig of the sixth aspect, the spacer has a spacer main body having the receiving surface, and an elastic sheet-like member covering the receiving surface. A processing jig is provided.

The spacer body receives the above-mentioned processing load applied to the workpiece, and the elastic sheet-like member functions as a buffer between the workpiece and the receiving surface of the spacer body.

According to an eighth aspect of the present invention, there is provided the processing jig according to the sixth or seventh aspect, wherein the spacer is made of a gas-permeable porous material. I do.

When the spacer receives the entire surface of the workpiece surrounded by the seal portion, it is preferable that the spacer be made of a gas-permeable porous material in order to communicate with the reduced-pressure space.

According to a ninth aspect of the present invention, in the processing jig according to the sixth or seventh aspect, the spacer has a ventilation hole communicating the receiving surface and a surface facing the receiving surface. And a processing jig.

When the spacer receives the entire surface of the workpiece surrounded by the seal portion, it is preferable to provide a ventilation hole in the spacer in order to communicate with the reduced-pressure space.

According to a tenth aspect of the present invention, there is provided the processing jig according to the sixth aspect, wherein the spacer is made of plastic.

When a plastic spacer is used, excellent processing accuracy can be obtained in processing a plastic workpiece.

An eleventh aspect of the present invention provides the processing jig according to the tenth aspect, wherein the plastic is polycarbonate.

When a spacer made of polycarbonate is used, good processing accuracy can be obtained.

[0035]

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.

[0036] The processing jig of the present invention comprises a ring-shaped seal portion that is in close contact with the workpiece, a reduced-pressure void portion in which the workpiece is in close contact with the seal portion to form a sealed space, and a reduced-pressure void portion. A valve capable of shutting off and opening communication between the workpiece and the outside, and a mounting portion for mounting to a processing machine for processing a workpiece.

The workpiece to be sucked and held by the processing jig of the present invention may be any workpiece as long as it has a smooth surface that is in close contact with the ring-shaped seal portion and is processed by a processing machine. Things are also covered. Usually, an optical material such as a plate material, particularly a lens material having a spherical or aspherical curved surface which forms a lens by polishing is suitable.

The ring-shaped seal portion is configured to be in close contact with the workpiece so as to hold the workpiece by suction, thereby forming a decompression void. The seal portion is made of an elastic material such as rubber or resin. It is preferable to use a ring-shaped packing such as an O-ring and a gasket. The packing ensures the sealing performance, does not damage the workpiece, and prevents the relative position between the workpiece and the processing jig during processing due to friction with the workpiece. can do. The characteristics of the packing, such as the spring hardness, are selected according to the workpiece, but the thickness of the packing is preferably 1 mm or less in order to increase the processing accuracy. It is also possible for the packing to be a thin film. Note that two or more seal portions can be provided. Needless to say, the shape of the seal portion can be changed according to the shape of the surface on which the workpiece is sucked.

The depressurized space is a concave portion having the ring-shaped seal portion as an opening, and when the work comes into close contact with the ring-shaped seal portion, the opening is closed by the work to form a sealed space. I do. When the ring-shaped seal portion is closed by the workpiece, the depressurized void portion allows air to flow through the outside of the processing jig via a valve.

When the valve is closed, the communication between the depressurized gap and the outside of the processing jig is cut off to seal the depressurized gap, and when the depressurized gap is depressurized, the depressurized state is maintained. Further, when the valve is opened, the depressurized gap can be communicated with the outside of the processing jig to reduce the pressure in the depressurized gap, or air can be introduced into the depressurized depressurized gap to break the vacuum.

The valve may be any valve as long as it can block and open the communication between the decompression gap and the outside of the processing jig.
One way vacuum valves can be used. In addition, when the pressure in the depressurized gap is lower than the outside, the communication between the depressurized gap and the outside is shut off, and when the pressure in the depressurized gap is higher than the outside, the communication between the depressurized gap and the outside of the processing jig is opened. A check valve can be used. By using the check valve, after reducing the pressure in the depressurized space, the valve is automatically closed without operating the valve when the pressure source is returned to the atmosphere, and the depressurized pressure in the depressurized space can be maintained.

When the valve is a non-return valve, in addition to the check valve, the depressurized air gap which is normally depressurized is shut off from the outside for leakage, and the depressurized air gap is connected to the outside when necessary. May be provided.

Further, a check valve having a leak mechanism which also functions as a vacuum breaking valve by giving a leak function to the check valve itself can be used. In this check valve with a leak mechanism, for example, the valve body is made of a ferromagnetic material, and the valve body can be moved by attracting the valve body with a magnet from the outside to open the valve. In addition, the valve element has a double structure, and an auxiliary valve element is provided in the main valve element. Usually, the main valve element and the auxiliary valve element operate integrally,
When the vacuum is broken, a check valve with a leak mechanism configured to open the auxiliary valve element by pushing the auxiliary valve element from the outside with a rod or the like can be used.

The mounting portion is mounted on a chuck of a processing machine such as a cutting machine or a polishing machine, and various types are employed according to the type of the processing machine.

When the workpiece is to be vacuum-adsorbed and fixed to the processing jig, the depressurized air gap and the reduced pressure source are connected via a closed valve, and the workpiece is fixed to the processing jig. Then, the valve is opened and the pressure is reduced in the depressurized space. After the decompression space is sufficiently decompressed,
When the valve is closed and the depressurized space is sealed, the reduced pressure in the depressurized space is maintained. As a result, the workpiece is pressed against the seal portion by the pressure difference between the reduced pressure gap portion and the atmospheric pressure, and the workpiece is sucked and held by the seal portion and fixed. Then, the mounting portion is mounted on a chuck or the like of the processing machine to process the workpiece. After the workpiece is processed, the valve is opened, air is introduced into the depressurized space, and the vacuum is broken, so that the workpiece can be easily separated from the processing jig.

FIG. 1 is a sectional view of an embodiment of the processing jig of the present invention. The processing jig 1 is used for sucking and holding a plastic lens material 100, and grinding and polishing the lens material 100 with a polishing device to process it into a plastic lens.

This processing jig 1 is made of a metal such as aluminum, and has a mounting portion 3 having a shape in which a protrusion having a mountain-shaped cross section is provided in the center of the lower surface of a disk-shaped suction holding portion 2 in a ring shape. A communication hole 4 which is provided integrally, penetrates through the suction holding section 2 at the center of the suction holding section 2, and opens at the center of the mounting section 3.
Is provided, and a check valve 5 with a leak mechanism is mounted in the communication hole 4.

The suction holding section 2 has a disk-shaped holding section main body 21.
A projecting portion 22 having a rectangular cross section surrounding the holding portion main body 21 in a ring shape is integrally formed on the outer peripheral portion of the upper surface of the device. A sealing projection 23 having a rectangular cross section is provided integrally on the outer periphery of the upper surface of the projection 22 over the entire circumference. A gasket 24 as a sealing portion is attached so as to cover the upper surface of the projection 23 for sealing. The holding portion main body 21 surrounded by the sealing projection 23 constitutes the depressurized space 6. A circular communication hole 4 that penetrates through the holding portion main body 21 and opens at the center of the mounting portion 3 is formed in the center of the holding portion main body 21. Further, a circular concave portion 25 is provided in the holding portion main body 21 around the communication hole 4.

The communication hole 4 is provided with a check valve 5 having a cylindrical leak mechanism. The communication hole 4 is provided with a screw,
Screws are also provided on the outer surface of the cylindrical check valve main body 51 of the check valve 5 with a leak mechanism, and the check valve 5 is mounted in the communication hole 4 by screwing these screws. A flange 511 that is thinner than the depth of the concave portion 25 is provided on the upper end surface of the check valve main body 51, and the lower surface of the flange 511 is in contact with the upper surface of the concave portion 25 of the holding portion main body 21.

A valve body 53 that penetrates the check valve body 51 in the axial direction and communicates the depressurized space 6 with the outside is provided with a valve element 53 that slides forward and backward in the flow path section 52. It is stored. A valve seat is provided at a front portion of the flow path portion 52, and a valve body 53 is provided.
Is seated on the valve seat when the vehicle advances, closing the flow path portion 52,
When the valve element 53 retreats, a gap is formed between the valve seat and the valve element 53, so that the flow path 52 is opened. Further, a compression spring 54 is provided as urging means for urging the valve body 53 to move forward. The valve body 53 is provided with a communication portion 531 for communicating the side surface and the rear surface of the valve body.

The check valve 5 with a leak mechanism is provided with a valve 53
Is made of a ferromagnetic material, and when the valve body 53 is moving forward, when the magnet approaches the valve body 53 from the rear side, the valve body 53 is attracted to the magnet by the magnetic force and retreats, and the flow path portion 52
Is opened so that a leak can be forcibly performed.

As shown in FIG. 1, when the lens material 100 is placed on the seal portion 24, the depressurized space 6 is formed between the suction surface 101 on the inner surface surrounded by the seal portion 24 of the lens material 100 and the suction holding portion 2. It becomes a sealed space surrounded by the inner surface and the check valve 5.

FIG. 2 is a cross-sectional view showing another embodiment of the processing jig of the present invention, and shows a processing jig in which a spacer is disposed in a depressurized space.

The processing jig 1b is basically the same as the processing jig 1 shown in FIG. 1 except that the spacer 7 is arranged in the depressurized space 6, and the suction jig 2 is slightly different. The same reference numerals are given to the same members, and the description thereof will be omitted.

In the processing jig 1 b, the holding body 21 of the suction holding unit 2 is provided with a plurality of ventilation grooves 26 extending radially from the recess 25 and reaching the protrusion 22. A circular shallow spacer recess 27 for mounting a spacer is provided on the upper surface of the holding portion main body 21. The recess 25 and the ventilation groove 26 constitute the reduced-pressure space 6.

The spacer 7 housed in the depressurized space 6 has a disk shape and is placed in the spacer recess 27.
Between the side surface of the spacer 7 and the projection 22,
Exists between the flange 511 of the check valve 5 and the lower surface of the spacer 7.

The spacer 7 is composed of a spacer main body 71 made of metal and a sheet-like member 72 having elasticity covering the entire upper surface of the spacer main body. The upper surface of the spacer body 71 is in contact with a receiving surface 73 against which a part or all of the suction surface (surface surrounded by the gasket 24) 101 of the lens material 100 that is sucked and held when the lens material 100 is sucked and held. And has substantially the same shape as the suction surface 101 of the lens material 100. For this reason, the shape and thickness of the receiving surface 73 of the spacer 7 are adjusted to the suction surface 10 of the lens material 100.
Since it is necessary to change it according to the surface shape of the processing jig 1, it is separate from the processing jig 1 b so that it can be replaced. Of course, the spacer 7 may be provided integrally with the processing jig 1b.

The spacer 7 is placed in the spacer recess 27, receives the suction surface 101 of the lens material 100 on the receiving surface 73, and places the space between the suction surface 101 and the spacer recess 27 of the holding body 21 facing the suction surface 101. It is interposed in. When the depressurized space 6 as shown in FIG. 1 is hollow, when a relatively soft workpiece such as a plastic lens material 100 is processed, the lens is subjected to stress from a processing tool such as a cutting tool. The material 100 may be deformed and the processing accuracy may be reduced. The role of the spacer 7 is to suppress the deformation of the lens material 100 during the processing by receiving the processing load received from the processing tool during the processing of the lens material 100 on the surface 73, thereby enabling the processing as designed.

For the spacer body 71, it is preferable to select a material whose shrinkage in thickness is as small as possible in order to maintain processing accuracy. In addition to metal, a relatively hard material such as plastic, hard rubber, or ceramic can be used. The receiving surface 73 of the spacer 7 is the lens material 1
In the case where the entire adsorption surface 101 is received, it is preferable to use a gas-permeable porous material such as a sintered metal as the spacer body 71. Instead of using a porous material, the spacer body may be provided with a fine ventilation hole for communicating the receiving surface 73 with a surface facing the receiving surface 73.
When the spacer main body 71 is formed using a gas-permeable porous material, the spacer main body 71 or the spacer main body 71 and the sheet-like member 72 may be formed in a shape that occupies the entire depressurized space 6. In this case, the depressurized gap 6 apparently does not exist, but the gap in the spacer body 71 forms the depressurized gap 6.

The elastic sheet-shaped member 72 covering the receiving surface 73 of the spacer 7 prevents the lens material 100 from being damaged, and serves as a cushioning material for the shape of the suction surface 101 of the lens material 100 and the spacer. 7 receiving surface 7
3 has a role of absorbing the inconsistency of the shape of the lens material 3 and enabling one spacer 7 to cope with many types of lens materials 100. Further, the displacement of the lens material 100 can be prevented by the frictional force. The thickness of the sheet member 72 is 0.0
It is preferably about 5 to 0.5 mm, usually about 0.1 to 0.3 mm. If the thickness is too small, the effect of reducing the number of types of spacers relative to the type of lens material is reduced, and if the thickness is too large, the processing accuracy is deteriorated. Even if the sheet-shaped member 72 is joined to the spacer main body 71, it can be used as an independent component so as to cover the receiving surface 73 of the spacer main body 71. When the spacer body 71 is made of a gas-permeable porous material or provided with air holes, it is preferable that the sheet-like member 72 is also made of a gas-permeable sponge-like porous material.

FIG. 3 shows a case where the spacer is made of plastic, and the other parts are the same as those shown in FIG. 2. Therefore, the same members are denoted by the same reference numerals and description thereof is omitted. I do.

In this processing jig 1c, the entire spacer 7 is made of plastic. The spacer 7 has a receiving surface 73 having substantially the same shape as the suction surface 101 of the lens material 100, is interposed between the lower surface 27 of the suction holding portion 2 and the lens material 100, and is formed by the stress of the cutting process. The function of preventing deformation and enabling processing as designed is the same as the spacer described above.

The kind of plastic used for the spacer 7 is, for example, heat of polyethylene, polypropylene, hard vinyl chloride resin, polystyrene, ABS resin, methacrylic resin, polyethylene terephthalate (PET), polyacetal, modified polyphenylene ether, polyamide, polycarbonate, etc. Examples thereof include thermosetting resins such as plastic resins, phenol resins, and polyurethanes.

The plastic spacer 7 has an appropriate rigidity close to the plastic lens material 100, is well adapted to the adsorption surface 101 of the lens material, and effectively deforms the lens material 100 due to stress during cutting. Prevention and processing as designed are possible. Moreover, a sheet-like member is not required, and processing into a spacer is easy.

The present inventor studied the processing accuracy when the spacer 7 was made of various materials and the plastic lens material was cut, and found that the spacer material greatly contributed to the processing accuracy. I learned. As a result, a material having a hardness close to the hardness of the workpiece has relatively good processing accuracy. For example, a metal that is too hard or a material that is too soft has poor processing accuracy. It was found that plastic was good in processing accuracy, and that there was a difference in processing accuracy depending on the type of plastic. It was polycarbonate that showed the best processing accuracy. The polycarbonate spacer is excellent in processing accuracy particularly when the center of the processed lens is the thinnest, and the processing accuracy comparable to the case where a conventional alloy is used can be obtained. Table 1 shows a comparison of the mechanical properties of various plastics.

[0066]

[Table 1]

From Table 1, it can be seen that polycarbonate has low Rockwell hardness (60 to 70 on the M scale) for relatively high mechanical strength. From this, the surface hardness of polycarbonate is softer than the hardness of the lens material, it fits well on the convex surface of the lens material without damaging the lens material, and since the rigidity is close to the lens material, the stress during cutting is dispersed. It is considered that deformation of the lens material can be effectively prevented. Another advantage is that machining can be easily performed since cutting can be performed.

However, since the result is a case where the workpiece is a plastic lens, if the workpiece is made of a different material, a rigid material such as metal or ceramic may have better processing accuracy. Of course there is.

Next, the method of using the processing jig 1b shown in FIG.
The convex surface 103 of the lens material 100 is fixed.
4 will be described as an example.

As shown in FIG. 4, the convex surface 103 of the lens material 100 is placed at a predetermined position on the gasket 24 of the processing jig 1b. As a result, a reduced pressure gap 6 is formed.
Next, as shown in FIG. 4, the pipe 1 connected to the operating decompression source 11 via the gate valve 12 which is closed.
The front end 14 of the check valve 3 is pressed against the flow path 52 of the check valve 5 to open the gate valve 12. As a result, the pressure in front of the valve element 53 of the check valve 5 becomes higher than that in the rear, so that the valve element 53
Is pressed by the pressure of the depressurized space 6 and retreats against the compression spring 54 to open the flow path 52. Then, the decompression space 6
Is drawn by the decompression source 11 through the ventilation groove 26, the flow path portion 52, and the communicating portion 531 of the valve element 53, and the pressure inside the decompression space 6 is reduced, and the lens material 100 is transferred to the gasket 24 and the spacer 7. Pressed at atmospheric pressure. When the pressure in the pressure-reducing space 6 is reduced and the pressure difference between the pressure-reducing source 11 and the pressure-reducing source 11 decreases, the valve body 53 advances by the urging force of the compression spring 54 and sits on the valve seat. Thereafter, when the gate valve 12 is closed and the tip 14 of the pipe 13 is removed from the processing jig 1, the valve body 53 of the check valve 5 is strongly pushed forward at atmospheric pressure, and the contact with the valve seat becomes strong. Thus, the flow path 52 is reliably closed, and the reduced pressure in the reduced pressure gap 6 is maintained.

In this manner, as shown in FIG. 1 and FIG. 2, the lens material 100 is formed by the pressure of the pressure difference between the atmospheric pressure applied to the area of the suction surface 101 surrounded by the gasket 24 and the pressure of the depressurized space 6. It is pressed and fixed by the processing jig 1. Therefore, the piping 13 is connected to the cutting machine or the polishing machine.
Can be attached in a state of a jig alone not connected. In this state, the mounting portion 3 is mounted on a chuck of a grinding machine or a polishing machine, and the concave surface 104 side of the lens material is processed to finish the lens surface. The lens material 100 is supported by the gasket 24 as a seal portion and the spacer 7 to suppress deformation during processing, and to restrict rotation of the workpiece by frictional resistance, thereby enabling processing as designed.

When the processed lens is removed from the processing jig 1b after the processing of the lens material is completed, the tip of the magnet 15 is brought close to the valve element 53 of the check valve 5, as shown in FIG. . As a result, the ferromagnetic valve element 53 is
, And retreats against the atmospheric pressure and the urging force of the compression spring 54, a gap is created between the valve seat and the valve body 53, and air is communicated from outside to the communicating portion of the valve body 53. 531,
The gas enters the depressurized space 6 through the flow path 52 and the ventilation groove 26, and is broken in vacuum. With this, the lens 105 after processing is completed
Since no pressure is applied to the jig 1b, it can be easily separated from the processing jig 1b. Therefore, the lens 10
No stress on 5 and no scratches.

The fixing of the workpiece such as the lens material 100 and the processing jig 1 is performed by using a vacuum, which is a method that does not use an adhesive medium. It has become possible to abolish steps such as attaching and detaching a protective tape, cleaning a processing jig, and regenerating an alloy or the like.

In addition, since the above-mentioned adhesive medium material is not required by the vacuum suction, it is needless to say that the manufacturing cost of the optical component can be suppressed in terms of cost.

Further, environmentally, a heat source for dissolving lead contained in the low melting point alloy and its alloy is not required, and a clean environment can be created.

Further, since an alloy containing lead is not used, the overall weight is reduced and the handling becomes easy.

In the processing jigs 1, 1b, and 1c described above, the check valve 5 is provided on the center axis of the processing jigs 1, 1b, and 1c. For example, as shown in FIG. A processing jig 1d provided with a check valve 5 so that the valve element operates in a direction perpendicular to the direction of the processing may be used. Further, the gasket 24 is provided so as to cover the upper surface of the sealing projection 23, but FIG.
As shown in (1), an O-ring groove 29 may be provided on the upper surface of the protruding portion 22, and the O-ring 24a may be mounted in the O-ring groove 29.

The processing jigs 1, 1b, 1
Although c and 1d adsorb and hold the convex surface 103 of the lens material 100, the lens material 1 is changed by changing the sealing protrusion 23, the gasket 24, and the spacer 7.
The convex surface 103 can be processed by sucking and holding the concave surface 104 of No. 00.

[0079]

According to the processing jig of the present invention, since the workpiece can be fixed by vacuum suction, the workpiece can be easily fixed without using an adhesive medium, and mounted on a processing machine. Can be processed. Further, the workpiece can be easily separated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a processing jig according to the present invention.

FIG. 2 is a cross-sectional view showing an embodiment showing a case where a spacer is provided on the processing jig of the present invention.

FIG. 3 is a cross-sectional view showing an embodiment showing a case where a plastic spacer is provided on the processing jig of the present invention.

4 is a cross-sectional view illustrating a state in which a workpiece is vacuum-sucked to the processing jig of FIG. 2;

FIG. 5 is a cross-sectional view illustrating a state where a workpiece is separated from the processing jig of FIG. 2;

FIG. 6 is a sectional view showing another embodiment of the processing jig of the present invention.

FIG. 7 is a sectional view showing a conventional processing jig.

[Explanation of symbols]

 1, 1b, 1c, 1d Processing jig 2 Suction holding part 21 Holding part main body 23 Sealing projection part 24 Gasket (seal part) 26 Ventilation groove 3 Mounting part 4 Communication hole 5 Valve (check valve) 51 Check valve Main body 52 Flow path 53 Valve body 6 Depressurized space 7 Spacer 71 Spacer main body 72 Sheet member 73 Receiving surface

Claims (11)

[Claims] 1. A ring-shaped seal portion that is in close contact with a workpiece, a reduced-pressure gap that forms a sealed space when the workpiece is in close contact with the seal portion, and a gap between the reduced-pressure gap and the outside. A processing jig, comprising: a valve capable of shutting off and opening communication, and a mounting portion for mounting to a processing machine that processes the workpiece. 2. The processing jig according to claim 1, wherein the valve cuts off communication between the decompression cavity and the outside when the pressure of the decompression cavity is lower than the outside, and A processing jig, characterized in that the processing jig is a check valve that opens communication between the depressurized space and the outside when the pressure of the portion is higher than the outside. 3. The processing jig according to claim 1, wherein the depressurized space which is normally depressurized is cut off from the outside, and the depressurized space is communicated with the outside when necessary. A processing jig, comprising: a vacuum break valve for causing the vacuum release valve. 4. The processing jig according to claim 3, wherein the check valve also serves as the vacuum breaking valve. 5. The processing jig according to claim 1, wherein the seal portion is formed of a packing. 6. The processing jig according to claim 1, wherein the processing jig is disposed in the depressurized space, and partially or entirely on a suction surface of the workpiece to be surrounded by the seal portion. A processing jig, comprising: a receiving surface that abuts; and a spacer interposed between the suction surface and a surface facing the suction surface in the depressurized gap. 7. The processing jig according to claim 6, wherein the spacer is a spacer body having the receiving surface;
And a sheet-like member having elasticity for covering the receiving surface. 8. The processing jig according to claim 6, wherein the spacer is made of a gas-permeable porous material. 9. The processing jig according to claim 6, wherein the spacer includes a ventilation hole communicating the receiving surface and a surface facing the receiving surface. . 10. The processing jig according to claim 6, wherein said spacer is made of plastic. 11. The processing jig according to claim 10, wherein the plastic is polycarbonate.