JP2000141195A - Lens machining method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens machining method and device to machine a lens with high efficiency and high precision without complicating a machining device itself more than necessary. SOLUTION: A lens machining device performs grinding and polishing by a grinding wheel 3 coinciding a lens shape with a lens 2 immersed in polishing liquid 5 where electrified fine abrasive grains 4 are dispersed. This lens machining device comprises a container 6 to store polishing liquid 5, a holder 7 to hold the lens 2 immersed in the polishing liquid 5, a drive source to rotate the grinding wheel 3 in the polishing liquid 5, the other electrode 11 immersed in the polishing liquid 5 such that the grinding wheel 3 forms one electrode side in the polishing liquid 5; a DC source 10 applying a voltage between the two electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens processing method and apparatus for processing a lens with high precision spherical surface.

[0002]

2. Description of the Related Art Conventionally, when performing a lens processing using a mold tool conforming to a lens shape, after using a mold wheel made of metal bond, it is further adhered to a mold wheel and / or a sticking plate made of resin bond. Processing was performed using the attached sheet and loose abrasive grains. Here, the total tool is
It is a concept that includes not only a grinding stone but also a sheet attached. In order to perform high-efficiency and high-quality processing in such a process, there is a lens processing method and apparatus described in JP-A-5-138520. An apparatus used in this technique will be described with reference to FIG.

In FIG. 5, a sticking plate 52 having conductivity is provided at the tip of a rotating shaft 51 connected to a drive source of a processing machine main body (not shown). Machining surface 53 formed to match
Is attached. And
A workpiece 55 is in contact with the processing surface 53, and a swingable holder 56 for mounting and holding the workpiece 55 is provided under pressure. By swinging the holder 56 via a screw 57, the workpiece 55 can be ground into a spherical surface. On the upper surface of the processing surface 53, a minus electrode 58 having a radius of curvature similar to the radius of curvature of the processing surface 53 is provided with a small gap from the processing surface 53. It is electrically connected to the negative pole of the power supply 59.

The grinding tool 54 is composed of two segments 60 and 61 arranged concentrically about the center of rotation thereof, and a non-contact portion between the adjacent segments 60 and 61 which is worn by the contact of a workpiece 55 being processed. The conductive resin 62 is filled so that current does not flow between the adjacent segments 60 and 61. The non-conductive resin 62 functions to fix the segments 60 and 61 to each other.

The positive pole of the electrode dressing power source 59 is electrically connected to each segment 60, 61 of the grinding tool 54 via each sliding brush 63. The wiring from the positive pole and the wiring from each sliding brush 63 are changed over by a switch 6.
4 and the changeover switch 64 is
By arbitrarily switching the connection between the anode wiring on the side of the electrolytic dress power source 59 and the wiring from each sliding brush 63 conducting to each segment 60, 61 of the grinding tool 54, the segments 60, 61 to which DC power is applied are changed. Making it possible.

In the vicinity of the negative electrode 58, a coolant connected to a coolant supply device (not shown) is provided to supply a weakly conductive coolant 65 to a minute gap between the negative electrode 58 and the processing surface 53 of the grinding tool 54. Nozzle 6
6 are provided.

In the machining method using the machining apparatus having the above configuration, first, a workpiece 55 is pressed against a grinding tool 54,
While rotating the grinding tool 54, the screw 75 is swung (in the direction of arrow A). At the same time, the changeover switch 64
Of the grinding tool 54 connected to the positive electrode of the electrolytic dress power source 59 via the sliding brush 63
By selecting 0 and 61 and supplying the weakly electric coolant 65 supplied by the coolant nozzle 66 between the minus electrode 58 and the processing surface 53 of the grinding tool 54, the shape of the processing surface 53 is uniform so as not to collapse. Electrolytic dressing. Thus, the workpiece 55 is subjected to electrolytic in-process dressing grinding by a grinding tool 54 into a spherical surface.

[0008]

Normally, when working with a general-type grindstone, work is first performed using a grindstone that is somewhat hard and has a coarser grain, and gradually changes to a finer and softer grindstone. Then, polishing is performed through a processing step using loose abrasives.

However, in the lens processing method and apparatus disclosed in Japanese Patent Application Laid-Open No. 5-138520, it is difficult to omit the processing steps because the particle diameter of the mold wheel is not controlled. Processing must be performed in a state. That is, the improvement of the performance of a single process and the improvement of the processing quality of the workpiece by preventing the shape deformation of the processing surface of the grinding tool can only be achieved.

[0010] In addition, the above-mentioned problems in the machining process can be reduced to some extent by making each segment individually movable with respect to the workpiece and using a composite grinding wheel such as a rough grinding wheel and a fine grinding wheel. On the other hand, it can solve the problem, but on the other hand, there is also a problem that the processing apparatus itself is complicated and the setup property is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is capable of processing a lens with high efficiency and high accuracy without making the processing apparatus itself unnecessarily complicated. It is intended to provide a method and apparatus.

[0012]

According to a first aspect of the present invention, there is provided a lens processing method for processing a lens surface using a forming tool having a spherical surface conforming to a lens shape. In the lens processing method, using a grindstone made of a conductive material for the mold tool having a spherical surface, the mold tool, electrodes, and a lens are immersed in a polishing liquid in which charged fine abrasive particles are dispersed. A voltage is applied between the forming tool and the electrode, and fine abrasive grains charged to a polarity opposite to that of the forming tool are aggregated on the surface of the forming tool for processing.

According to a second aspect of the present invention, there is provided a lens processing method for processing a lens surface using a full-form tool having a spherical surface matching a lens shape. After processing the lens surface with a tool,
The mold tool, the electrode, in a state of being immersed in a polishing liquid in which the charged fine abrasive grains are dispersed, apply a voltage between the mold tool and the electrode, to the opposite polarity of the mold tool. The method is characterized in that charged fine abrasive grains are aggregated on the surface of the forming tool and processed.

Further, a lens processing method according to a third aspect of the present invention is directed to a lens processing method for processing a lens surface using a forming tool having a spherical surface matching the lens shape.
An outer peripheral member made of a conductive material is arranged in an annular shape on the outer peripheral portion of the forming tool made of a non-conductive material, and after processing the lens surface with the forming tool, the forming tool and the outer periphery are formed. In a state where the charged fine abrasive grains are dispersed in a polishing liquid in which the charged fine abrasive grains are dispersed, the voltage is applied between the outer peripheral member and the electrode, and the charged fine abrasive grains are applied to the surface of the outer peripheral member. The surface of the lens is processed by agglomeration.

In the lens processing apparatus according to a fourth aspect of the present invention, the lens is immersed in a polishing liquid in which charged fine abrasive grains are dispersed, and the grinding and polishing processing is performed with a mold tool conforming to the lens shape. In the lens processing apparatus, a container for storing the polishing liquid, a holder for holding a lens immersed in the polishing liquid, a driving source for rotating the mold tool in the polishing liquid, and a mold in the polishing liquid. It is characterized in that it is provided with another electrode immersed in a polishing liquid so that the tool side is the one electrode side, and a power supply for applying a voltage between the electrodes.

According to a fifth aspect of the present invention, there is provided a lens processing apparatus according to the fourth aspect, wherein the other electrode immersed in the polishing liquid is a lens holder. .

Further, in the lens processing apparatus according to a sixth aspect of the present invention, there is provided the lens processing apparatus according to the fourth aspect, wherein the forming tool has a driving source for oscillating the planet around the center of curvature of the lens. I do.

In the lens processing method according to the first and second aspects, the processing is performed with the fine abrasive grains held on the surface of the forming tool. That is, it is possible to obtain a high-precision machined surface with the same forming tool used for ordinary rough grinding and fine grinding. In addition, the state of the processed surface can be controlled by changing the time or timing of applying a voltage. For example, when the forming tool is a rough grinding tool, a voltage is applied after the rough grinding processing, the processing is performed for a certain time in a state where fine abrasive grains are aggregated on the surface of the forming tool, and the processed surface is close to fine grinding. State. In addition, when the forming tool is a precision grinding tool,
After the fine grinding, a voltage is applied to bring the processed surface closer to the polished state in the same manner as described above.

In the lens processing method according to the third aspect, the charged fine abrasive grains adhere to an outer peripheral member made of a conductive material arranged in an annular shape on the outer peripheral portion of the forming die tool. Even without conductivity, fine abrasive grains are collected on or near the surface of the forming tool. Other functions are described in claims 1 and 2.
Is the same as

In the lens processing apparatus according to the fourth aspect of the present invention, the processing can be performed in a state where the mold tool and the lens are immersed in the polishing liquid, and the polishing always includes fine abrasive grains between the electrode and the mold tool. The liquid intervenes, and stable supply of fine abrasive grains is performed.

In the lens processing apparatus according to the fifth aspect, the lens holder functions as an electrode, and there is no need to separately arrange an electrode in the polishing liquid, so that the apparatus can be simplified.

In the lens processing apparatus according to the sixth aspect of the present invention, when the forming tool rotates in a planetary manner (rotational swing), the machining resistance changes due to a change in the swinging direction, and the polishing liquid enters. The rapid movement of the container itself is suppressed.

Further, the lens processing method and apparatus according to the first to sixth aspects of the present invention use the electrophoresis phenomenon for fine abrasive grains,
The agglomerate is uniformly agglomerated on the electrode consisting of the outer member arranged on the surface of the forming tool or the outer peripheral part of the forming tool, and the polishing process is performed with the fine abrasive grains held. The surface roughness is smaller than that of the processing method described above, and it is suitable for polishing high-quality lenses.

Further, the processing speed can be controlled by, for example, changing the electrical conditions of the application, so that a highly accurate processed surface can be obtained more simply.

[0025]

[First Embodiment] FIG. 1 shows a first embodiment of the present invention. Fig. 1 shows grinding and electrophoresis
It is a schematic sectional drawing which shows the lens processing apparatus which performs a polishing process.

In the figure, a grinding wheel shaft 1 is connected to a drive source of a processing machine main body, not shown, and is rotatable in the direction of arrow B around the axis. The grinding wheel shaft 1 is made of a conductive material (metal). A grinding wheel 3 for processing a lens 2 as a forming tool having a spherical surface matching a desired lens shape is connected to a tip of the grinding wheel shaft 1, and a lens having a spherical surface matching the lens shape is formed on an upper portion of the grinding wheel 3. It has a processing surface 3a. The grindstone 3 has conductivity and is not particularly limited in type as long as it has conductivity.
Those formed of a metal-based binder and those formed of a resin-based binder such as a conductive resin are preferable. The grinding wheel shaft 1 is connected to a drive source that swings in the direction of arrow C separately from the rotation drive source. A dynamic exercise is performed.

A vessel 6 having an open top for holding a polishing liquid 5 containing (dispersed) charged fine abrasive grains 4 is connected to the grinding wheel shaft 1. The container 6 may be made of any material, but is preferably made of a material that is not affected by the contained polishing liquid 5. The container 6 has a depth such that the grindstone 3 can be immersed in the contained polishing liquid 5 and the polishing liquid 5 does not spill out of the container 6 due to the swing or rotation of the grinding wheel shaft 1.

The fine abrasive grains 4 may be anything as long as they are charged, but are preferably in a colloidal shape. Therefore, there is no problem as long as the particle diameter of the fine abrasive grains 4 is stable as a colloidal shape, but preferably 1 to 100 nm. Although the material is not particularly limited, when processing the lens 2, high efficiency and high quality are desired. Therefore, colloidal cerium oxide, colloidal silica, colloidal alumina, colloidal zirconia and the like are suitable.

The lens 2 has a concave surface 2a to be processed, and a lens processing surface 3a of the grindstone 3 and a processing surface 2a of the lens 2 in the polishing liquid 5 in a state of being fitted into the holder 7.
Are arranged to face each other, and the holder 7 is connected to the kanseki 8 via a kanshi receiving part 7a integrated with the holder 7. The kansashi 8 is connected to a processing machine main body (not shown).
Can be set to any pressing condition with respect to the lens processing surface 3a of the grindstone 3.

An electrode brush 9 having the mold tool side as one electrode side is in contact with the outer periphery of the grinding wheel shaft 1 outside the container 6. The shape and material of the electrode brush 9 are not particularly limited as long as the electrode brush 9 has conductivity and can always maintain the contact state with the grinding wheel shaft 1. The electrode brush 9 is electrically connected to a DC power supply 10 at a polarity opposite to the polarity of the charged fine abrasive grains 4 and uses the grindstone 3 as one electrode. DC power supply 10
The voltage can be changed by a dedicated circuit (not shown).

The DC power source 10 has an electrode 11 as the other electrode immersed in the polishing liquid 5 and the electrode brush 9.
Is electrically connected to a different pole from the connected pole. The electrode 11 is immersed in the polishing liquid 5 at a certain distance from the lens 2 and the grindstone 3. Electrode 11
Any shape and material may be used as long as they are conductive, and may be carbon, conductive resin or metal.

In the parts which are in contact with the polishing liquid 5 such as the grinding wheel shaft 1, the grinding wheel 3 and the holder 7, the surface on which the fine abrasive grains 4 do not need to be attached by utilizing the electrophoresis phenomenon is coated with an insulating paint. Painted and insulated.

Next, a lens processing method using the lens processing apparatus having the above configuration will be described. By driving a drive source of a processing machine main body (not shown), the grindstone shaft 1 is rotated, and at the same time, is rocked, thereby processing the lens 2 held by the holder 7. At the start of processing, no voltage is applied from the DC power supply 10, and pressure is applied from above to the lens processing surface 3 a of the grindstone 3 via the wrench 8 in the same manner as in normal processing, so that the processing surface of the lens 2 is 2a
Processing proceeds.

Before the processing is completed, a voltage is applied between the electrodes by the DC power supply 10. There is no particular limitation on the applied voltage,
About 1V-100V is good. The polarity of the electrode brush 9 (grinding stone 3) and the electrode 11 depends on the charged polarity of the fine abrasive grains 4. That is, when the fine abrasive grains are negatively charged, the electric brush 9 is set to a positive electrode, and the electrode 11 is set to a negative electrode. As a result, the negatively charged fine abrasive grains are attracted toward the positive grinding wheel 3 by the electrophoresis phenomenon. Conversely, when the polarity of the charged fine abrasive grains 4 is positive, the electrode brush 9 is used as a negative electrode, and the electrode 11 is used as a positive electrode.

At this time, the grindstone 3 is electrically insulated from the polishing liquid 5 except for the lens processing surface 3a.
Surface (lens processing surface 3a which is the contact surface with lens 2)
The fine abrasive grains 4 adhere to the surface. By gathering the fine abrasive grains 4, an abrasive layer 12 is formed on the lens processing surface 3a. Further processing is performed in a state in which the abrasive layer 12 is formed. However, since the amount and adhesion of the charged fine abrasive particles 4 to the lens processing surface 3a of the conductive grinding stone 3 are electrical, By controlling the electrical conditions (voltage) of the power supply 10, the amount and adhesion of the fine abrasive grains 4 can be controlled. Also, at this time, it is preferable to reduce the pressure of pressing the work surface 2a of the lens 2 against the grindstone 3 via the screw 8. Thereby, the polishing liquid 5 easily permeates between the lens processing surface 3a of the grindstone 3 and the processing surface 2a of the lens 2, and the formation of the abrasive layer 12 is promoted.

As a result, the fine abrasive grains 4 become electrically conductive whetstones 3
The processing of the lens 2 proceeds with the abrasive grain layer 12 formed on the lens processing surface 3a, which is the surface of the lens processing surface 3a. Therefore, while performing the grinding, the polishing can be performed at the same time, that is, continuously without replacing the grindstone 3.

According to the present embodiment, when the lens 2 is ground, the fine abrasive grains 4 charged using electrophoresis are used.
The grinding and polishing can be performed simultaneously, that is, continuously without replacing the grindstone 3, by attaching the grinding wheel 3 to the grinding wheel 3 continuously, thereby improving the processing efficiency and at the same time improving the quality of the lens. 2 can be performed. Further, by controlling the electrical conditions (voltage) and the processing time, the processing efficiency can be easily controlled.

[Second Embodiment] FIG. 2 shows a second embodiment of the present invention. FIG. 2 is a schematic sectional view showing a lens processing apparatus for performing grinding and polishing using electrophoresis. In addition,
The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As in the first embodiment, the lens processing apparatus according to the present embodiment employs a polishing liquid in which fine abrasive grains 4 charged in a lens 2 having a concave surface to be processed 2a to be ground and polished are dispersed. The polishing process is performed in a state of being immersed in 5.

In this lens processing apparatus, a center hole 16 for supplying the polishing liquid 5 between the lens processing surface 15a of the grinding wheel 15 and the processing surface 2a of the lens 2 is provided at the center of the grinding wheel 15 used for processing the lens 2. The provision is different from the configuration of the first embodiment. The center hole 16 is connected to a polishing liquid supply device (not shown) through a hole 1 a provided in the grinding wheel shaft 1. A polishing liquid receiver 17 for the polishing liquid 5 overflowing from the container 6 is provided outside the container 6.
Is connected to the polishing liquid supply device through a drain passage not shown.

Further, the electrode 11 from the DC power source 10 is in contact with the kansashi 8. The kansashi 8 and the holder 7 are made of a conductive material, and the DC power supply 10 and the holder 7 are electrically connected. Other configurations are the same as those of the first embodiment.

Next, a lens processing method using the lens processing apparatus having the above configuration will be described. In the same manner as in the first embodiment, the lens 2 is processed by the grindstone 15 in the polishing liquid 5 in which the charged fine abrasive grains 4 are dispersed. Is applied. As a result, similarly to the first embodiment, the abrasive layer 12 is formed on the lens processing surface 15 a of the grindstone 15. At this time, since the polishing liquid 5 is supplied from the polishing liquid supply device (not shown) through the center hole 16 of the grinding stone 15 onto the lens processing surface 15a, the center of the lens processing surface 15a of the grinding stone 15 to which the polishing liquid 5 is difficult to supply. The polishing liquid 5 is sufficiently supplied to the vicinity.

Since the polishing liquid 5 is supplied into the container 6, the polishing liquid 5 overflows from the container 6, and the overflowing polishing liquid 5 is received by the polishing liquid receiver 17. The polishing liquid 5 flowing into the polishing liquid receiver 17 is returned to a polishing liquid supply device (not shown) through a drain passage. On the other hand, since the holder 7 is electrically connected to the DC power supply 10 via the kansushi 8, it plays the role of the electrode 11 in the first embodiment. Other processing methods are the same as in the first embodiment.

According to the present embodiment, as in the first embodiment, the processing is performed while attaching the fine abrasive grains 4 to the grindstone 15 using the electrophoresis phenomenon, thereby improving the processing efficiency and improving the processing efficiency. It is possible to process the quality lens 2. Further, the grinding stone 1 on which the abrasive layer 12 is hardly formed
Since the polishing liquid 5 is sufficiently supplied also to the center of the lens processing surface 15 through the center hole 16, the formation of the abrasive layer 12 is promoted, and the processing efficiency is further improved. In addition, holder 7
Plays the role of an electrode, so that the device itself is simplified, and the installation space can be saved.

[Embodiment 3] FIGS. 3 and 4 show Embodiment 3 of the present invention. FIG. 3 is a schematic cross-sectional view showing a lens processing apparatus for performing grinding and polishing using electrophoresis, and FIG. 4 is a perspective view showing a grinding wheel shaft and a grinding stone, as viewed from above the lens processing apparatus. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the lens processing apparatus of the present embodiment, similarly to the first and second embodiments, the fine abrasive grains 4 charged in the lens 2 having the concave surface 2a to be ground and polished are dispersed. The polishing is performed in a state of being immersed in the polishing liquid 5.

The grindstone 21 used in the present embodiment is made of a non-conductive material, and an outer peripheral member 22 made of a conductive material is adhered to an outer peripheral portion thereof. The grindstone 21 and the outer peripheral member 22 are divided into annular zones as shown in FIG. 4, and the outer peripheral member 22 is electrically connected to the grindstone shaft 1 made of a conductive material.

The lens processing surface (surface) 21a of the grindstone 21 and the surface of the outer peripheral member 22 (the surface on the processing surface 21a side of the grindstone 21) are not set at the same height. It protrudes from the surface of the member 22 by about 1 mm, and a step is formed on both surfaces. The step prevents the surface of the outer peripheral member 22 from abutting on the processing surface 2a of the lens 2 when the concave processing surface 2a of the lens 2 is ground by the lens processing surface 21a of the grindstone 21. This is also for forming and growing the abrasive layer 12 of the fine abrasive grains 4 on the surface of the outer peripheral member 22 during the polishing process. In addition, this step varies depending on the time for forming the abrasive grain layer 12 and the applied voltage, but is preferably about 0.5 to 1.5 mm.
Note that when the formation time and the voltage are set to be large, the step can be further increased.

The electrode 11 connected to the DC power supply 10 is in contact with the kansashi 8 as in the second embodiment, and the kansashi 8 and the holder 7 are also formed of a conductive material, and the holder 7 plays the role of an electrode. It has become.

The grinding wheel shaft 1 is similar to the first and second embodiments,
It is connected to the drive source of the processing machine body not shown.
This drive source is connected to a crankshaft 23 which is a mechanism for rotating (revolving) the grinding wheel shaft 1 in the direction of arrow B and rotating (revolving) the grinding wheel shaft 1 itself in the direction of arrow D. Other configurations are the same as those of the first embodiment.

Next, a lens processing method using the lens processing apparatus having the above configuration will be described. As in the first embodiment, the lens 2 is processed by the grindstone 21 in the polishing liquid 5 in which the charged fine abrasive grains 4 are dispersed, and after the grinding processing proceeds to some extent, the DC power supply 10 applies a voltage between the electrodes. Is applied. Thus, the processing is performed in a state where the charged fine abrasive grains 4 are attached between the surface of the outer peripheral member 22 made of a conductive material and the processing surface 2a of the lens 2 as in the first embodiment. At this time, by controlling the electrical conditions (voltage), the amount and the adhesion of the fine abrasive grains 4 adhering to the surface of the outer peripheral member 22 can be controlled. Then, the fine abrasive grains 4 interposed between the outer peripheral member 22 and the lens 2 also extend on the lens processing surface 21a of the grindstone 21 due to processing resistance. Thereby, the lens processing surface 21a of the grinding wheel 21 and the outer peripheral member 2
The abrasive layer 12 is formed on the surface of the lens 2, and the abrasive layer 12 is interposed between the lens 2 and the surface 2 a to be processed.

On the other hand, the swinging motion of the grinding wheel shaft 1 is caused by the rotation (revolution) movement (direction of arrow D) of the crankshaft 23 different from the rotation (rotation) of the grinding wheel shaft 1 in the direction of arrow B, ie, By revolving around the center of curvature of the processing surface 2 a of the lens 2, the whetstone 21 swings. This swinging motion is performed in a circle as shown by an arrow E in FIG. Hereinafter, this rocking motion is referred to as planetary motion. Other processing methods are the same as in the first embodiment.

According to Embodiment 3, Embodiments 1 and 2
2, the fine abrasive grains 4 are adhered to the outer peripheral member 22 using the electrophoresis phenomenon, and the lens processing surface 21a of the grindstone 21 is formed.
By performing the processing while forming the abrasive layer 12 on the surface of the outer peripheral member 22, the processing efficiency can be improved and the high-quality lens 2 can be processed. Furthermore, since the grindstone 21 can be made non-conductive (for example, a resin-bonded grindstone), a soft grindstone or vitrified grindstone having no conductivity can be used, and the processed surface quality of the lens 2 can be further improved. effective.
In addition, the planetary motion of the grindstone shaft 1 has the effect of suppressing a rapid change in the processing resistance, scattering of the polishing liquid 5, and the like.

In the first to third embodiments of the present invention, only the lens 2 having the concave surface 2a has been described. However, the lens having the convex surface has the same structure. Processing, and there is no difference in the effect.

Further, in the above description, the case where the lens 2 is processed while being immersed in the polishing liquid 5 has been described. If the polishing liquid 5 can be supplied, there is no difference in its effect even if the method of processing by pouring the polishing liquid 5 is used.

The grindstones 3 and 15 as the mold tool are formed by combining abrasive grains with a metal-based binder, or by combining abrasive grains with a resin-based binder such as a conductive resin, or a non-abrasive. Although the one using a conductive resin-based binder or clay-based binder (vitrified whetstone) was mentioned, the surface of the sticking dish was also ground using a conductive resin-based binder or a clay-based binder. It is also possible to attach a sheet or the like to which is bonded.

The technical idea having the following configuration is derived from the above-described specific embodiment. (Supplementary note) (1) In a lens processing method of processing a lens surface using a mold tool having a spherical surface matching the lens shape,
Using a grindstone made of a conductive material for the mold tool having a spherical surface, the mold tool, electrodes and lenses are immersed in a polishing liquid in which charged fine abrasive particles are dispersed. A polishing liquid having charged fine abrasive grains is supplied to a processing surface from a hole provided in the hole, a voltage is applied between the forming tool and an electrode, and the fine abrasive grains charged to a polarity opposite to that of the forming tool. Wherein the surface of the forming tool is aggregated and processed.

(2) In a lens machining method for machining a lens surface using a mold having a spherical surface conforming to the lens shape, the lens surface is machined with a mold provided with conductivity. Supplying a polishing liquid having charged fine abrasive grains to the processing surface from a hole provided in the spherical surface of the forming tool, while immersing the forming tool, electrodes and lenses in a polishing liquid in which charged fine abrasive grains are dispersed. A lens characterized in that a voltage is applied between the forming tool and an electrode, and fine abrasive grains charged in the opposite polarity to the forming tool are aggregated on the surface of the forming tool to process the lens. Processing method.

According to the lens processing methods (1) and (2), the polishing liquid having fine abrasive grains charged from the spherical surface of the forming tool is supplied, so that the polishing liquid to which the polishing liquid is difficult to supply is supplied. Fine abrasive grains can be supplied near the center of the tool, and the charged fine abrasive grains can be processed by electrophoresis while forming an abrasive layer while uniformly aggregating on the surface of the forming tool. .

[0060]

As described above, according to the lens processing method of the first and second aspects of the present invention, the polishing of the lens is performed while the charged fine abrasive grains are aggregated on the surface of the forming tool by electrophoresis. Thus, the processing efficiency can be improved, and the effect of processing a high-quality lens can be obtained.

According to the lens processing method of the third aspect of the present invention, even when a non-conductive material forming tool is used, the charged fine abrasive grains can be aggregated on the surface of the forming tool by electrophoresis. As a result, an effect that a high-quality lens can be processed can be obtained.

According to the lens processing apparatus of the fourth aspect of the present invention, stable electrophoresis occurs in the polishing liquid, and the lens is raised while forming an abrasive layer made of fine abrasive grains on the surface of the forming tool. The processing can be performed efficiently, and the effect of processing a high-quality lens can be obtained.

According to the lens processing apparatus of the fifth aspect of the present invention, since the electrode section for applying a voltage to the polishing liquid is a holder for holding the lens, the processing apparatus can be simplified and the space can be omitted. Can be played.

According to the lens processing apparatus of the sixth aspect of the present invention, since the forming tool makes a planetary motion about the center of curvature of the lens, the fluctuation of the processing resistance can be reduced and the polishing liquid can be prevented from scattering. Can be played.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a lens processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a lens processing apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a lens processing apparatus according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing a grindstone shaft and a grindstone of a lens processing apparatus according to a third embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whetstone axis 2 Lens 2a Work surface 3,15,21 Grindstone 3a, 15a Lens work surface 4 Fine abrasive 5 Polishing liquid 6 Container 7 Holder 8 Kansashi 9 Electrode brush 10 DC power supply 11 Electrode 12 Abrasive layer 16 Center hole 17 Polishing liquid receiver 22 Outer peripheral member 23 Crankshaft

Claims (6)

[Claims] 1. A lens processing method for processing a lens surface using a forming tool having a spherical surface matching a lens shape, wherein a grinding stone made of a conductive material is used for the forming tool having a spherical surface. In the state of being immersed in a polishing liquid in which fine abrasive grains charged to the mold tool, the electrode and the lens are dispersed, a voltage is applied between the mold tool and the electrode, and charged to the opposite polarity to the mold tool. A lens processing method comprising: aggregating and processing the fine abrasive grains formed on the surface of the forming tool. 2. A lens machining method for machining a lens surface using a mold having a spherical surface matching the shape of a lens. In a state where the mold tool, the electrode, and the lens are immersed in the polishing liquid in which the charged fine abrasive particles are dispersed, a voltage is applied between the mold tool and the electrode, and the polarity is opposite to the polarity of the mold tool. A lens processing method, wherein fine abrasive grains are aggregated on the surface of the forming tool and processed. 3. A lens machining method for machining a lens surface using a mold having a spherical surface matching the shape of a lens, wherein an annular zone is formed on an outer peripheral portion of the mold formed of a non-conductive material. An outer peripheral member made of a conductive material is disposed on the mold tool, and after processing the lens surface with the mold tool, the mold tool, the outer member, the electrode, and the lens are immersed in a polishing liquid in which charged fine abrasive particles are dispersed. A lens processing method, wherein a voltage is applied between the outer peripheral member and the electrode in the above state, and the charged fine abrasive grains are aggregated on the surface of the outer peripheral member to process the lens surface. 4. A lens processing apparatus for performing grinding and polishing with a mold tool conforming to a lens shape while immersing a lens in a polishing liquid in which charged fine abrasive grains are dispersed,
A container for storing the polishing liquid, a holder for holding a lens immersed in the polishing liquid, a drive source for rotating the forming tool in the polishing liquid, and one of the forming tool sides in the polishing liquid. A lens processing apparatus comprising: the other electrode immersed in a polishing liquid so as to be on the electrode side; and a power supply for applying a voltage between the electrodes. 5. The lens according to claim 4, wherein the other electrode immersed in the polishing liquid is a lens holder.
The lens processing apparatus as described in the above. 6. The lens processing apparatus according to claim 4, wherein said forming tool has a drive source for oscillating a planet about a center of curvature of the lens.