KR20120132196A - Lens grinding apparatus and lens grinding method - Google Patents

Abstract

PURPOSE: A lens grinding apparatus and method are provided to simultaneously grind first and second surfaces to be grinded by simultaneously powering first and second drive units for rotating first and second grinding bodies. CONSTITUTION: A lens grinding apparatus comprises a first grinding unit, a second grinding unit(50), and a control unit(80). The first grinding unit comprises a first grinding body(30) and a first drive unit(40). The first grinding body touches a first surface(11) to be grinded. The first drive unit rotates the first grinding unit. The second grinding unit comprises a second grinding body(60) and a second drive body. The second grinding body touches a second surface(12) to be grinded. The second drive unit rotates the second grinding body. The control unit simultaneously powers the first and second drive units.

Description

Lens grinding apparatus and lens grinding method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing tool and a polishing method for polishing an optical surface of an optical element such as a lens, and more particularly to a polishing tool and a polishing method for polishing a plurality of optical surfaces simultaneously.

 In general, concave surfaces such as spectacle lenses are formed by cutting or the like on spherical surfaces, rotationally symmetric aspherical surfaces, toric surfaces, and progressive surfaces. Then, the formed optical surface is mirror polished.

Friction polishing using a rigid polishing plate is used for simple curved mirror polishing such as spherical surfaces and toric surfaces. Since the mirror polishing method using the polishing plate is a method of transferring the surface shape of the polishing plate to the to-be-polished surface, the number of processed plates is required as many as the surface shape corresponding to the lens formulation.

In addition, for complicated curved surfaces such as progressive surfaces, or so-called free curved shapes, polishing cannot be performed by using a polishing method using a rigid polishing plate. Therefore, the use of an elastic polishing tool is generally performed.

As a method of using an elastic polishing tool, Japanese Laid-Open Patent Publication No. 2003-275949 proposes a polishing method using a balloon polishing tool. In the polishing method described above, the pressure gas is introduced into the balloon-type polishing tool to expand it, and the pressure is adjusted to be changed to a curvature suitable for the curved shape of the surface to be polished by adjusting the pressure.

Therefore, since a curved surface shape can be followed by many to-be-polished surfaces, it can respond to the grinding | polishing of a to-be-polished surface with one kind of balloon type grinding | polishing tool.

On the other hand, Japanese Laid-Open Patent Publication No. 2000-317797 discloses a partial polishing method using a small dome-shaped elastic polishing tool in contact with a part of the surface to be polished. This polishing method is a method of polishing the entire surface to be polished by successive local polishing by a small elastic polishing tool.

However, such a conventional polishing tool is inefficient because the polishing of one optical surface after polishing one optical surface when polishing an optical element having at least one optical surface, such as a meniscus lens. have.

An object of the present invention is to provide a lens polishing apparatus and a polishing method capable of simultaneously polishing an optical surface of a lens to solve the above problems.

The lens polishing apparatus according to the present invention for achieving the above object is a lens polishing apparatus for polishing a lens formed with a first surface and a second surface to be polished on both surfaces facing each other, the first polishing surface A first polishing part including a first polishing body in pressure contact with a surface and a first driving unit for rotating the first polishing body, a second polishing body in contact with the second to-be-polished surface, and the second polishing body And a second polishing part including a second driving part to rotate the first driving part, and a control unit controlling the first driving part and the second driving part to be driven at the same time.

The lens polishing method according to the present invention for achieving the above object is to prepare a lens provided with a first surface and a second surface to be polished on both sides facing each other and the first surface and the second surface A fixing step of fixing the lens such that the polishing surface is exposed to the outside; a first polishing body having a first curvature and a second polishing body having a second curvature on the first and second polishing surfaces, respectively; A polishing step of simultaneously polishing the first to-be-polished surface and the second to-be-polished surface by simultaneously operating the first driving unit for rotating the first polishing body and the second driving unit for rotating the first polishing body. Include.

According to the grinding | polishing tool and the grinding | polishing method which concern on this invention, the optical surface of the lens which has at least 1 or more optical surfaces like a meniscus lens can be polished simultaneously, and a grinding | polishing time can be shortened.

1 is a perspective view showing a lens polishing apparatus according to the present invention,
2 is a block diagram illustrating a lens polishing method according to the present invention.

Hereinafter, an apparatus for polishing a lens 10 according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a lens polishing apparatus according to the present invention. Referring to FIG. 1, the lens polishing apparatus includes a first polishing unit 20, a second polishing unit 50, and a controller 80.

The lens 10 has a concave first to-be-polished surface 11 and a second to-be-polished surface 12 convex in a direction opposite to the first to-be-polished surface 11. Here, the first to-be-polished surface 11 is polished to have a first curvature by the first polishing unit 20 to be described later, and the second to-be-polished surface 12 is formed by the second polishing unit 50 to be described later. It is polished to have two curvatures.

The lens 10 is fixed by the clamp 13 for pressing the circumferential surface to prevent the lens 10 from being separated when polished by the first polishing portion 20 and the second polishing portion 50 to be described later.

The first polishing unit 20 includes a first polishing body 30 and a first driving unit 40.

The first abrasive body 30 has a convex curved surface having a first curvature at the bottom to polish the first to-be-polished surface 11 to have a first curvature. The first polishing body 30 is in contact with the first polishing surface 11 and rotated by the first driving unit 40 to be described later to polish the first polishing surface 11.

The first driving part 40 includes a first driving motor 41 and a first holder 45.

The first driving motor 41 is positioned above the lens 10 by a first support frame 47 connected to one side to provide power for rotating the first polishing unit 20.

The first drive motor 41 is a geared motor is applied.

The first holder 45 is fixed to the rotational shaft of the first drive motor 41 and the first mounting groove into which the first abrasive body 30 is inserted and mounted to support the first abrasive body 30. Prepared. The spring 46 is first inserted into the first mounting groove, and the first abrasive body 30 is inserted therein.

The second polishing unit 50 includes a second polishing body 60 and a second driving unit 70.

The second abrasive body 60 has a concave curved surface having a second curvature on top thereof by polishing the second to-be-polished surface 12 to have a second curvature. The second abrasive body 60 is in contact with the second to-be-polished surface 12 and rotated by the second driving unit 70 to be described later to polish the second to-be-polished surface 12.

The second driving unit 70 is rotated by the second driving motor 71 and the second driving motor 71 installed at a position corresponding to the position of the first driving unit 40 and the second polishing body 60. It includes a second holder 75 for supporting. The second holder 75 is formed with a second mounting groove into which the second abrasive body 60 is inserted and fixed.

The controller 80 controls the first driving motor 41 and the second driving motor 71 to rotate at the same time.

Hereinafter, a method of polishing the lens 10 according to the present invention will be described in detail.

2 shows a method of polishing a lens 10 according to the present invention. Referring to FIG. 2, the lens 10 polishing method includes a fixing step and a polishing step.

In the fixing step, a lens 10 having a first to-be-polished surface 11 and a second to-be-polished surface 12, respectively, is provided on opposite surfaces, and the first to-be-polished surface 11 and the second to-be-polished surface are prepared. The lens 10 is fixed to the clamp 13 so that the 12 is exposed to the outside.

The lens 10 is fixed to the fixing part such that the first to-be-polished surface 11 and the second to-be-polished surface 12 face upward and downward directions, respectively.

The polishing step is made to contact the first abrasive body 30 having the first curvature 30 and the second abrasive body 60 having the second curvature on the first and second to-be-polished surfaces 11 and 12, respectively. The first polishing surface 11 and the second polishing surface are operated by simultaneously operating the first driving unit 40 for rotating the first polishing body 30 and the second driving unit 70 for rotating the second polishing body 60. The surface 12 is polished at the same time.

Through the polishing step, the first to-be-polished surface 11 and the second to-be-polished surface 12 are formed to have a first curvature and a second curvature, respectively.

The lens polishing apparatus and the lens polishing method according to the present invention as described above have been described with reference to one embodiment shown in the drawings, but this is merely illustrative, and those skilled in the art may various modifications therefrom. And other equivalent embodiments are possible.

Accordingly, the true scope of protection of the invention should be defined by the appended claims.

10: lens
20: first polishing part
30: first abrasive body
40: first driving part
50: second polishing part
60: second abrasive body
70: second drive unit
80: control unit

Claims (2)

A lens polishing apparatus for polishing a lens having a first to-be-polished surface and a second to-be-polished surface respectively formed on opposite surfaces thereof,
A first polishing unit including a first polishing body in pressure contact with the first to-be-polished surface and a first driving unit to rotate the first polishing body;
A second polishing part including a second polishing body in contact with the second to-be-polished surface, and a second driving part for rotating the second polishing body;
And a control unit for controlling the first driving unit and the second driving unit to be driven at the same time. A fixing step of preparing a lens having a first to-be-polished surface and a second to-be-polished surface respectively provided on opposite surfaces, and fixing the lens to expose the first and second to-be-polished surfaces to the outside; ;
A first driving part which contacts the first polishing body having a first curvature and the second polishing body having a second curvature and rotates the first polishing body on the first and second polishing surfaces, respectively; And polishing the first to-be-polished surface and the second to-be-polished surface simultaneously by simultaneously operating a second driving unit for rotating the second polishing body.

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