JPH08206952A - Curved surface polishing tool - Google Patents

Abstract

PURPOSE: To continuously and efficiently polish a surface even if a polishing object surface is an aspheric surface by freely following it by bringing a polishing pad into close contact with a ceiling outside surface of a hollow dome, and arranging an air supply adjusting means to adjust its quantity when air is supplied in this hollow dome through a freely swinging rotary shaft. CONSTITUTION: When a central part of a lens 1 is polished, air is supplied in a space through an air supply pipe 11 being an air supply adjusting means, a communicating ring 12 and an air supply pipe 13 according to curvature of the central part of the lens 1, and a ceiling part of a hollow dome 6 is projected, and a polishing pad 10 brought into close contact with a ceiling outside surface is pressed to a polishing object surface of the lens 1, and it is polished. Next, a cock 14 is operated, and when a quantity of air supplied in the hollow dome 6 is gradually let out, a projecting quantity of the hollow dome 6 is gradually reduced, and while a part pressed to the polishing object surface of the lens 1 in the polishing pad 10 is gradually transferred to an outer peripheral part from the rotational center of a rotary shaft, thus the polishing object surface is polished over the whole circumference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved surface polishing tool most suitable for polishing a curved surface such as a lens.

[0002]

2. Description of the Related Art Generally, a lens is classified into a single spherical lens having a curved surface and an aspherical lens having a plurality of curved surfaces. By the way, in the conventional spherical lens manufacturing process, a roughing process of grinding with a curve generator (diamond wheel) to a constant curve with a grinding accuracy of about 25 μ, and a grinding accuracy of grinding with a curved dish with diamond pellets are used. Is about 3μ, and a finishing polishing step of polishing in a mirror shape with a curved dish having a polishing pad attached with the same curve as the previous step.

[0003]

However, since the above-mentioned conventional method is a method of transferring the accuracy of the curved surface of the tool to the curved surface of the lens, in the finish polishing step, a dedicated curvature curve having the same specific curvature curve as in the previous step is used. The polishing plate is required, and the number of polishing plates to be prepared increases in accordance with the shape of the spherical surface of the lens, and the replacement work is troublesome.

Further, in this method, since the polishing dish is rotated while being swung, only a spherical lens having a single curved surface can be polished, and an aspherical lens having a plurality of curved surfaces is polished. It was impossible to do by the way.

On the other hand, recently, with the development of NC control, it has become possible to cut the surface of a glass material to a desired curvature with an NC-controlled cutting tool, which has opened the way for automatic processing of aspherical lenses. Even if it is cut by this method, the cutting surface of the cutting surface is notched when viewed microscopically, so the surface must be polished to a mirror shape of the same aspherical surface after cutting, A method for efficiently finish-polishing an aspherical surface has not yet been established, and the advent of a curved surface polishing tool capable of finish-polishing an aspherical surface has been strongly desired.

[0006] Recently, the demand for plastic lenses used for spectacles has been increasing, but plastic lenses are required to have larger diameters with an emphasis on fashionability. However, as the diameter of the plastic lens increases, the edge of the lens becomes thicker and the weight increases accordingly, which adversely affects functionality and fashionability.

Therefore, recently, when molding a plastic lens, a method has been adopted in which an extra thickness portion of the outer peripheral portion of the lens is thinly molded in advance, and a molded lens of a special shape has been required for molding. Therefore, the appearance of a curved surface polishing tool capable of efficiently finishing polishing the molded lens has been strongly desired.

The present invention has been proposed in view of the above-mentioned conventional circumstances, and the surface to be polished may be spherical or aspherical, or may be a curved surface such as a molded lens. However, not only can it be handled arbitrarily, and even if the curvature changes, it can be polished efficiently following it, and it has an extremely simple structure, can be manufactured at low cost, and is easy to handle. The purpose is to provide a curved polishing tool.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a dish fixed to the end of a rotary shaft capable of swinging or adjusting an angle, and an elastic material formed on the dish. A hollow dome, a polishing pad adhered to the outer surface of the ceiling of the hollow dome, and an air supply adjusting means for supplying air into the hollow dome via a rotating shaft and adjusting the amount thereof A polishing tool is configured, and further, a hollow dome is configured by a thick base edge portion made of an elastic material and a film continuous to the base edge portion. is there.

[0010]

Since the curved surface polishing tool of the present invention is constructed by the means as described above, when air is supplied into the rotating dome, the ceiling portion of the hollow dome expands and projects outwardly. If the portion is pressed against the surface to be polished, the pressing portion is polished by the polishing pad attached to the outer surface of the ceiling of the protruding hollow dome. When the air inside the hollow dome is gradually exhausted, the amount of protrusion of the ceiling gradually decreases and the pressing part of the polishing pad gradually moves outward from the center of rotation. The entire curved surface is polished while following the curved surface.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in FIGS. FIG. 1 is a partially cutaway side view showing a procedure for polishing a lens using a curved surface polishing tool according to the present invention. FIG. 2 shows the center portion of the lens, and FIG. 3 shows the peripheral portion of the lens as the lens being polished. It is explanatory drawing which shows the relationship with the shape of a hollow dome.

In the figure, reference numeral 1 denotes a lens to be polished, which is supported by a support 3 via a chuck 2. Reference numeral 4 denotes a rotary shaft whose swing or angle can be adjusted, and a plate 5 is fixed to its end. Next, 6 is a hollow dome made of an elastic material formed on the plate 5, and is formed into a dome shape by a thick base edge portion 7 made of the elastic material and a film 8 continuous with the base edge portion 7. For example, the film 8 is made of rubber and the base edge portion 7 is made of sponge rubber, and it is designed so that the pressing force is dispersed by elasticity at the time of pressing so that the film easily fits on the curved surface.

However, the base edge portion 7 and the membrane 8 may be integrally molded or may be bonded and molded, and an appropriate space 9 is secured inside, and the space 9 is filled with air. Then, it suffices that the film 8 expands into a hemispherical shape. 10 is a polishing pad closely attached to the outer surface of the ceiling of the hollow dome 6,
Even if the hollow dome 6 made of an elastic material is deformed by its elasticity, the hollow dome 6 is integrally deformed, and a non-woven fabric rich in elasticity and flexibility is used as a base material so that wrinkles do not occur on the surface.

Reference numeral 11 denotes an air supply pipe connected to an air supply source (not shown), which is connected to an air supply pipe 13 disposed inside the rotary shaft 4 via a communication ring 12 to connect the rotary shaft 4 to the air supply pipe 13. The air can be supplied into the space 9 of the hollow dome 6 even while rotating.

Reference numeral 14 is a cock for arbitrarily adjusting the amount of air supplied to the hollow dome 6. Also, 1
Reference numeral 5 is a slurry-like loose abrasive grain supplied to the surface to be polished. In the curved surface polishing tool of the present invention having the above structure,
In order to polish the central portion of the lens 1, the air supply pipe 11, the communication ring 12, and the air supply pipe 13 which are air supply adjusting means according to the curvature of the central portion of the lens 1.
Air may be supplied into the space 9 through the above to project the ceiling portion of the hollow dome 6 and press the polishing pad 10 closely attached to the outer surface of the ceiling against the surface to be polished of the lens 1 for polishing.

At this time, the hollow dome 6 is rotated by the rotation of the rotating shaft 4, but since the rotating shaft 4 can be swung or the angle can be adjusted, the rotating shaft 4 is swung as shown in FIG. While, or by rotating while maintaining a constant angle, the central portion of the lens 1 is uniformly and accurately polished. Next, if the cock 14 is operated to gradually remove the amount of air supplied into the hollow dome 6, as shown in FIG. While the portion of the lens 1 pressed against the surface to be polished gradually moves from the center of rotation of the rotating shaft 4 to the outer peripheral portion, the surface to be polished is polished over the entire surface.

The curved surface polishing tool of the present invention is capable of polishing a spherical surface, an aspherical surface, or any other curved surface by the deformation of the hollow dome 6. There is no problem in terms of accuracy because the surface is smoothed by pressing 10 and the pressing force required for it is not so strong. However, it goes without saying that the air adjusting and supplying means, the swinging mechanism of the rotary shaft 4, the angle imparting mechanism and the like can be arbitrarily designed by adopting known means as necessary.

[0018]

As described above in detail, according to the present invention, the amount of protrusion of the ceiling portion of the hollow dome is adjusted according to the amount of air supplied into the hollow dome even when the rotary shaft is rotating. Since it can be adjusted arbitrarily, even if the surface to be ground is an aspherical surface, it can be freely followed and continuously and efficiently polished.

Further, since the structure is extremely simple and can be manufactured at low cost, and various curvatures can be dealt with by one unit without replacing the polishing plate or the like, the maintenance cost is low and the handling is extremely easy. It is possible to provide a curved surface polishing tool that has many advantages such as being easy and is extremely effective in practical use and has a wide range of applications.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a procedure for polishing a lens using a curved surface polishing tool according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a lens whose center is being polished and a shape of a central dome using the curved surface polishing tool shown in FIG.

FIG. 3 is an explanatory diagram showing the relationship between the lens being polished on the peripheral portion of the lens and the shape of the central dome using the curved surface polishing tool shown in FIG.

[Explanation of symbols]

 1 lens for polishing 2 chuck 3 support 4 rotating shaft 5 plate 6 hollow dome 7 base edge 8 membrane 9 space 10 polishing pad 11 air supply pipe 12 communication ring 13 air supply pipe 14 cock 15 slurry-like Free Abrasive Grain 19 Small Pulley 20 Belt 21 Tooth 21A Circumferential Surface (Grinding Surface) 21B End Face (Grinding Surface) 22 Tooth Holder Holder 23 Holder Shaft 24 Medium Pulley 25 Motor for Driving Toyoishi 26 Medium Pulley 27 Belt 28 Rail 29 Guide 30 Screw for Lifting 31 Motor for raising and lowering the tooth 32 Small pulley 33 Large pulley 34 Belt 35 Dresser (corresponding to X axis direction) 36 Dresser (corresponding to Y axis direction) 37 Dresser (corresponding to Z axis direction) 38 Grinding water tank 39 Chips 40 Cooling water 41 Grinding water 42 Bottom surface 43 Partition wall 44 Liquid level 45 Pump 46 Cyclone 47 Fresh water 48 Sludge 49 Sludge tank 50 Sediment 51 Scraping shovel 52 Sewage 53 Cooling water 54 cooling nozzles 55 throttle valve 56 wash water 57 relief valve 58 wash water 59 nozzle 60 close door 61 solenoid valves

Claims (2)

[Claims] 1. A dish fixed to an end of a rotary shaft capable of swinging or adjusting an angle, a hollow dome made of an elastic material formed on the dish, and a hollow dome closely attached to the outer surface of the ceiling. And a polishing pad, and an air supply adjusting means for supplying air into the hollow dome via a rotating shaft and adjusting the amount thereof. 2. The curved surface polishing tool according to claim 1, wherein the hollow dome is composed of a thick base edge portion made of an elastic material and a film continuous to the base edge portion.