JP2002178249A - Optical component machining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sludge, etc., from sticking and remaining on an optical component after machining. SOLUTION: In the grinding and polishing works pressurizing a lens 1 onto the surface of a tool 2 such as a fixed abrasive grain polishing tool and swinging the lens 1 while rotating the tool 2 at high speed, the lens sludge, etc., remain on the work surface of the lens 1 by burning in finishing the machining. To prevent the generation of such adhesions, the temperature of water or abrasive liquid L fed from a nozzle 6 is controlled to a low temperature of 10 deg.C or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding and polishing process for an optical component such as a lens, on which a sludge composed mainly of the optical component, a fixed abrasive tool, etc. The present invention relates to an optical component processing method capable of preventing resin, abrasive grains, and the like from remaining as attached matter.

[0002]

2. Description of the Related Art Conventionally, when a fixed abrasive tool or the like is used as a processing tool in the grinding and polishing of an optical component such as a lens, the abrasive or the like remains on the surface to be processed as an adhered substance, and There is a problem of deteriorating quality. In order to prevent this, for example, an apparatus disclosed in Japanese Patent Application Laid-Open No. 6-63856 is known.

In this apparatus, as shown in FIG. 3, a rotary holder 102 for supporting a lens 101, which is a work, is attached so as to communicate with a solenoid valve 105 from a ventilation hole 103 via a connecting pipe 104. The valve 105 is in communication with a vacuum suction device (not shown), and the controller 107 can switch the suction.

The lens 101 is held by suction on a rotary holder 102, and the rotary holder 102 is moved up and down by an air cylinder 106.

With such a lens polishing apparatus, a processing tool made of fixed abrasive grains is brought into contact with the lens 101, and the processing tool is rotated to perform polishing. After machining for a predetermined time, the solenoid valve 105 is opened by the controller 107 while the machining tool is rotating, and the lens 101 is
Is adsorbed. Thus, the lens 101 is detached from the processing tool during the rotation of the processing tool.

That is, during the rotation of a tool manufactured using fixed abrasive grains, an optical component such as a lens is detached,
It is intended to prevent the adhered matter such as abrasive grains from remaining on the surface to be processed after the processing is completed, and good lens performance can be obtained without abrasive grains or the like being buried in the surface of the optical component as a product.

[0007]

However, the above-mentioned prior art requires a complicated lens suction mechanism as described above, and a general processing apparatus without such a mechanism requires a fixed abrasive polishing tool or the like. It is very difficult to separate the tool and the lens during rotation of the lens. Therefore, there is an unsolved problem of lack of versatility in selecting a polishing apparatus and a processing method to be used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned unresolved problems of the prior art, and even in a processing apparatus not provided with a lens suction mechanism or the like, sludge or abrasive grains are formed on a surface to be processed of an optical component. It is an object of the present invention to provide an optical component processing method capable of easily and efficiently avoiding the remaining of such deposits.

[0009]

In order to achieve the above object, an optical component processing method of the present invention slides the optical component and the processing tool while supplying water or a polishing liquid between the optical component and the processing tool. An optical component processing method for processing together, wherein the water or the polishing liquid is controlled at a predetermined low temperature to reduce the amount of deposits on a surface to be processed of the optical component.

The water or polishing liquid is preferably controlled at a low temperature of 10 ° C. or less.

[0011]

[Function] When an optical component such as a lens is processed by a processing tool such as a fixed abrasive polishing tool, a sludge composed of a lens component, a resin and abrasive grains of a processing tool are formed on a surface to be processed of the optical component after the processing. Adhered matter remains, and as it is, deterioration of the optical performance of the optical component is caused. Therefore, water or a polishing liquid controlled at a low temperature of 10 ° C. or less is supplied between the optical component being processed and the processing tool to prevent sticking of foreign substances such as sludge and abrasive grains to the surface to be processed of the optical component. .

[0012] At the end of machining, without using a complicated process or means such as detaching the machining tool from the machining surface of the optical component while rotating, the machining surface of the machining surface can be controlled only by simple temperature control of water or a polishing liquid. The generation of deposits can be prevented, and the production efficiency of high-quality optical components can be greatly improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A fixed abrasive polishing tool, which is a working tool, is one in which abrasive grains such as cerium oxide are mixed with a resin-based bond and solidified after stirring. Compared with a polyurethane sheet, which is a polishing pad generally used in polishing, it has a porous (bubble) content of several percent and a very dense composition. For this reason, when the tool is rotated at a high speed and the lens is pressed with a predetermined processing pressure and the two are rubbed together by relative movement, the degree of adhesion between the processing surface of the fixed abrasive polishing tool and the processing surface of the lens is high. In addition, considerable polishing heat is generated on the surface to be processed of the lens by the high-speed rotation.

When the lens is processed under such processing conditions, the sludge and the abrasive grains of the tool are mainly generated between the processing surface of the fixed abrasive polishing tool and the surface to be processed of the lens due to the main component of the lens generated during the progress of polishing. However, when the rotation of the tool is stopped, it is instantaneously seized on the lens surface and remains as an adhered substance.

As a result of analyzing the deposits, it was found that the main components of the lens were mostly contained, and the remaining deposits could not be removed by washing with a washing machine or the like, but could be removed by scraping with a razor. Since no stains or stains were left on the processed surface after the removal, it was determined that the phenomenon was a relatively slight burn-in phenomenon.

Such a slight burn-in can be effectively avoided by reducing the processing heat during the polishing processing.
In order to prevent the adhesion of foreign substances such as lens sludge and the generation of residues due to the seizure phenomenon, the temperature of water used in a processing step using a fixed abrasive polishing tool or the like or a polishing liquid such as a low-concentration polishing slurry is reduced to, for example, 10 ° C. or lower. It was found that controlling the temperature was effective.

FIG. 1 illustrates an embodiment. In polishing a lens 1 as an optical component, a tool 2 as a fixed abrasive polishing tool (working tool) is attached to a main shaft of a polishing machine (not shown). And rotate. The lens 1 is held by the lens holder 3 and set on the tip projection of the screwdriver 4,
It is brought into contact with the processing surface of the tool 2 and is pressed and driven in the vertical direction of the paper using an air cylinder (not shown).

The kansashi arm 5 drives the eccentric cam (not shown) with a motor via a swing shaft to swing the lens 1 in an arc.

The nozzle 6 jets water or polishing liquid L supplied from a cooling pump 7 toward the lens 1 and the tool 2.

Next, the operation during the polishing process will be described.

In this polishing apparatus, the lens 1 is pressed by the tool 2 fixed to the main shaft of the polishing machine through the wrench 4 to perform high-speed rotational polishing that can maintain the curvature radius accuracy and shorten the processing time. . During this time, water or polishing liquid L supplied from the nozzle 6 by the cooling pump 7 toward the lens 1 and the tool 2 is scattered.

At this time, CH-151AF manufactured by Taitec Corporation or the like is used as a cooling pump, and the temperature of the water or the polishing liquid L is controlled at a low temperature.

Regarding the control of the liquid temperature at a low temperature, experiments and examinations were conducted on the composition analysis of the deposits and the processing process in grinding and polishing using a fixed abrasive polishing tool.

FIG. 2 is a graph showing the rate of occurrence of deposits in a processing experiment with respect to a change in the temperature of the polishing liquid. It can be seen that the rate of occurrence of deposits decreases significantly as the temperature decreases. In particular, it was found that the rate of occurrence of the deposits was 0% when the processing was carried out by setting the temperature of water or the polishing liquid to 10 ° C. or lower.

Further, as an additional measure against the removal of processing heat during polishing, a method in which the processing pressure for pressing the lens against the fixed abrasive polishing tool is reduced for a certain period of time before the end of the polishing processing, It was also confirmed that a method in which the number of revolutions of the tool shaft was processed at a low number of revolutions for a certain period of time before the end of the polishing process was effective in reducing residues.

By using these methods in combination with the liquid temperature control, the effect of reducing deposits is further improved.

According to the present embodiment, as described above, the cause of adhesion and residual sludge and the like that deteriorate the quality of a lens and the like is as follows.
It is determined that the burn-in phenomenon is caused by the processing heat and the degree of adhesion during the polishing process, and water or the polishing liquid used in the processing step is controlled at a low temperature in order to prevent the burn-in phenomenon.

As a result, the residue on the processed surface of the optical component such as the processed lens is greatly reduced, and a lens or the like having good lens performance can be produced very efficiently.

Next, an embodiment will be described.

The material of the glass blank, which is a lens material, is LaSF016, the effective diameter dimension φ of the glass blank is 6.5 mm, and the processing curvature radius R is 4.1 mm.

The processing pressure in the polishing step is 1.2 kgf (1
At 1.8 Pa), the temperature of water or the polishing solution was controlled at a low temperature of 10 ° C. ± 2.

The main spindle rotation speed of the fixed-abrasive polishing tool in the polishing step is 2000 rpm for the primary rotation speed, and the processing time is 1
At 20 seconds, the lens holder made a subordinate rotation.

On the surface of the processed lens, the generation of deposits due to sludge or the like was 0%.

[0034]

Since the present invention is configured as described above, the following effects can be obtained.

At the end of processing, there is no need for a lens suction mechanism or the like for detaching the lens while rotating the processing tool, and extremely easily and effectively avoids contamination of the surface to be processed of the optical component by deposits. it can.

As a result, the production efficiency of high quality lenses and the like can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method for processing an optical component according to an embodiment.

FIG. 2 is a graph showing a relationship between a liquid temperature and an attached matter generation rate.

FIG. 3 is a view showing a method of processing an optical component according to a conventional example.

[Explanation of symbols]

 1 lens 2 tool 4 lens holder 6 nozzle

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C047 FF09 FF19 3C049 AA02 AA07 AC04 CB01 3C058 AA04 AA11 AA16 AB01 AB04 AB06 AC04 BA02 BA08 BA12 CA01 CA06

Claims (3)

[Claims] 1. A method for processing an optical component by rubbing the optical component and the processing tool while supplying water or a polishing liquid between the optical component and the processing tool, wherein the water or the polishing liquid is supplied to a predetermined position. An optical component processing method, characterized by reducing the amount of deposits on the surface to be processed of the optical component by controlling the temperature to a low temperature. 2. The method according to claim 1, wherein the temperature of the water or the polishing liquid is controlled to a low temperature of 10 ° C. or less. 3. The optical component processing method according to claim 1, wherein the processing tool is a fixed abrasive polishing tool.