KR20100110530A

KR20100110530A - Bifocal lens and method for manufacturing the same

Info

Publication number: KR20100110530A
Application number: KR1020090028907A
Authority: KR
Inventors: 문재오
Original assignee: 주식회사 경기광학
Priority date: 2009-04-03
Filing date: 2009-04-03
Publication date: 2010-10-13

Abstract

The present invention relates to a bifocal lens and a manufacturing method for manufacturing the same. As for the bifocal lens, the sub groove | channel 1b which is concave from the surface of the lens base material 1 is formed in the center of the lens base material 1 which comprises the remote part 1a to one side; The sub groove 1b is characterized in that the near portion 2 formed by filling a material having a refractive index larger than that of the lens base material 1 is formed. In addition, the bifocal lens manufacturing method has a first molding mold 10 having a convex surface 10a and a concave surface 20a corresponding to the convex surface 10, but one side from the center of the concave surface 20a. The first step (S1) for maintaining the first molding mold 10 and the second molding mold 20 spaced apart using the second molding mold 20 having a sub-convex surface 20b protrudingly ); By filling the first resin between the first and second molding molds 10 and 20 and hardening them, the sub grooves corresponding to the remote portion 1a and the sub-convex surface 20b corresponding to the concave surface 20a ( A second step (S2) of forming the lens mother (1) formed with 1b); A third step (S3) of separating the lens mother (1) from the first and second molding molds (10, 20); Filling the sub groove (1b) of the lens mother (1) with a second resin having a refractive index larger than that of the lens mother (1) and solidifying (S4); And a fifth step (S5) in which the surface curvatures of the remote portion 1a and the near portion 1b are equally ground.

Description

Bifocal lens and manufacturing method for manufacturing same {Bifocal lens and method for manufacturing the same}

The present invention relates to a bifocal lens and a manufacturing method for manufacturing the same, and more particularly to a bifocal lens having a far portion and a near portion of the same curved surface and a manufacturing method for manufacturing the same.

Presbyopia is an aging phenomenon in which it becomes difficult to see a near place due to refraction abnormality resulting from hardening of the lens and loss of elasticity with age. Since presbyopia is not corrected unlike hyperopia or nearsightedness, people with presbyopia should carry long-distance glasses and short-range glasses, and use long-range glasses and near-field glasses when looking near. . Therefore, there was always the inconvenience of carrying both the long distance glasses and the near eye glasses together.

Due to this inconvenience, by dividing one spectacle lens into two parts, a bifocal lens has been developed in which an upper portion is formed with a far-field having a frequency used for far distance, and a lower portion is formed with a near-field formed with a frequency used for short distance. It is used. In this case, the far portion is a concave lens and the near portion is a convex lens.

By the way, the bifocal lens is severely refracted at the boundary part because the boundary that protrudes between the far part and the near part is formed, thereby making the vision uncomfortable.

In addition, because the near portion is a convex lens, it protrudes from the lens surface, and thus the bifocal lens is clearly distinguished from the ordinary lens. In other words, since bifocal lenses are clearly distinguished from ordinary lenses, people wearing bifocal lenses have a preconception that they are old.

On the basis of this problem, the focal lens is progressively changed, and the focal lens with the far and near portions formed in an indefinite boundary has been introduced.

However, in the case of the focal lens, the focal point gradually changes in the area between the distant part and the near part, and at the same time, many foci are formed in the near part, which causes dizziness.

The present invention was created in order to solve the above problems, by having a far section and a short distance having the same curved surface can make it look like a general lens, and the far section and the near section are clearly distinguished do not cause dizziness An object of the present invention is to provide a focus lens and a method of manufacturing the same.

In order to achieve the above object, the bifocal lens according to the present invention is a sub-groove 1b concave from the surface of the lens base 1 to be biased to one side in the center of the lens base material 1 forming the remote portion 1a. ) Is formed; The sub groove 1b is characterized in that the near portion 2 is formed by filling the material of the refractive index larger than the lens base material (1).

In order to achieve the above object, the bifocal lens manufacturing method according to the present invention, the first molding mold 10 having a convex surface (10a), and the concave surface (20a) corresponding to the convex surface (10) By using the second molding mold 20 having a sub-convex surface (20b) projecting to one side from the center of the concave surface (20a), the first molding mold 10 and the second molding mold ( A first step S1 of keeping 20) spaced apart; The first resin is filled and hardened between the first and second molding molds 10 and 20 to correspond to the remote portion 1a corresponding to the concave surface 20a and the sub-convex surface 20b. A second step (S2) of shaping the lens cap 1 with the subgrooves 1b; A third step (S3) of separating the lens mother (1) from the first and second molding molds (10) (20); Filling the sub groove (1b) of the lens mother (1) with a second resin having a refractive index larger than that of the lens mother (1) and solidifying (S4); And a fifth step (S5) in which the surface curvatures of the remote portion 1a and the near portion 1b are equally ground.

According to the bifocal lens and the manufacturing method thereof according to the present invention, since the boundary separating the far portion and the near portion is minimized, the refraction is minimized at the boundary portion, thereby reducing discomfort or dizziness at the boundary portion. Can be.

In addition, since the curved surfaces of the far portion and the near portion are the same, the far portion and the near portion are not clearly distinguished from the lens base material, whereby the bifocal lens of the present application looks like a general lens. Accordingly, there is an effect and an effect that a person wearing the bifocal lens of the present application can be made older.

Hereinafter, a bifocal lens according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view of a bifocal lens according to the present invention, and FIGS. 2A to 2C are views illustrating various forms of a short distance part.

As shown, the bifocal lens according to the present invention has a concave sub-groove 1b formed from the surface of the lens base 1 to be biased to one side at the center of the lens base material 1 constituting the remote portion 1a. ; The sub groove 1b is characterized in that the near portion 2 formed by filling a material having a refractive index larger than that of the lens base material 1 is formed. That is, by increasing the refractive index of the material constituting the near section 2 as compared to the material constituting the lens base material 1, the near section 2 serves to substantially act as a convex lens. For example, the material constituting the remote portion 1a is a CR monomer having a refractive index of 1.498 or a 1.548 NK monomer, and the material constituting the near portion 20 has an MR monomer having a refractive index of 1.60 or 1,67 or 1,71 or 1.74. to be.

The convex surface is formed in the upper part of the lens base material 1, and the concave surface is formed in the lower part. At this time, the near portion 2 is preferably formed on the upper convex surface.

The curvatures of the curved surfaces of the remote portion 1a and the near portion 2, that is, the surface curvature, are the same. Therefore, on the surface of the lens base material 1, no boundary is formed at the portion where the remote portion 1a and the near portion 2 are connected. That is, even if the near part 2 is provided in the remote part 1a, the thickness of the same radius is all the same in the center of the lens base material 1, and thus the bifocal lens of this application is not distinguished from a normal lens.

The short distance formed to be biased from the center of the lens base material 1 to one side may be implemented in various ways. The short distance 2 may be embodied in an elliptical shape having a small size, as shown in FIG. 2A, and the short distance 2 '. 2b may be implemented in a semicircle of small size, and the near portion 2 ″ may be implemented in a semicircle form as shown in FIG. 2c. As described above, the near portion may be formed in various forms in addition to the illustrated shape. Of course, it can be implemented.

Next, a method of manufacturing a bifocal lens according to the present invention will be described.

FIG. 3 is a view for explaining a process of manufacturing a bifocal lens according to the present invention using the first and second molding molds, and FIG. 4 is a view for explaining that a sub groove is formed in the lens base material manufactured in FIG. 3. FIG. 5 is a view for explaining that the second resin of FIG. 4 is hardened by filling a second resin having a large refractive index. Here, the same reference numerals as in FIGS. 1 and 2 are the same members having the same function.

As shown, the bifocal lens manufacturing method according to the present invention, having a first molding mold 10 having a convex surface (10a), and a concave surface (20a) corresponding to the convex surface (10), the concave surface The first molding mold 10 and the second molding mold 20 are spaced apart from each other by using the second molding mold 20 having the subconvex surface 20b projected to one side from the center of the center 20a. Maintaining the first step (S1); By filling the first resin between the first and second molding molds 10 and 20 and hardening them, the sub grooves corresponding to the remote portion 1a and the sub-convex surface 20b corresponding to the concave surface 20a ( A second step (S2) of shaping the lens cap 1 with the formed 1b); A third step (S3) of separating the lens mother (1) from the first and second molding molds (10, 20); Filling the sub groove 1b of the lens mother 1 with a second resin having a refractive index greater than that of the lens mother 1 and solidifying (S4); And a fifth step S5 in which the surface curvatures of the remote portion 1a and the near portion 1b are equally ground.

The first step S1 is a step of fixing the first molding mold 10 and the second molding mold 20 made of glass to be spaced apart at regular intervals, which is the first and second molding molds 10 and 20. It can be implemented by winding the edge of the tape (T). Accordingly, a space is formed between the first and second molding molds 10 and 20.

The second step S2 is a step of injecting a liquid resin between the first and second molding molds 10 and 20 which are kept spaced apart by the tape T. The resin used in this example is a CR monomer having a refractive index of 1.498 or a 1.548 NK monomer. At this time, the first and second molding molds 10 and 20 into which the resin is injected are placed in an oven set at a temperature of 30 to 90 ° C. to harden the resin by passing for 18 to 24 hours.

In the lens base material 1 formed through the second step S2, as shown in FIG. 1, a sub groove 1b is formed in a portion corresponding to the sub convex surface 20b and the sub groove 1b. Except for the remaining portion is a remote portion (1a).

In the third step S3, the tape T surrounding the edges of the first and second molding molds 10 and 20 is removed to separate the first and second molding molds 10 and 20. In the separated lens wool 1, the sub groove 1b is formed in the center part.

The fourth step S4 is to fill the sub groove 1b with a second resin having a refractive index greater than that of the lens base material 1, and the second resin used here has a refractive index of 1.60 or 1,67 or 1,71. Or an MR monomer that is 1.74. This injects the second resin into the sub groove 1b with the lens base material 1 disposed so that the sub groove 1b is horizontal, and then cures for 18 to 24 hours at an oven temperature of 30 to 90 ° C. .

In the fifth step S5, as shown in FIG. 5, the second resin, which is filled and cured in the sub groove 1b of the lens base 1, has the same curved surface C as the lens base material 1. Grinding. After filling the second resin into the sub groove (1b) and is hardened, it protrudes toward the upper side of the curved surface (C), which is removed by grinding these protrusions. By doing so, the far portion 1a and the near portion 1b of the same curved surface are formed in the lens base material 1, whereby the bifocal lens of the present application appears to have the same shape as a general lens.

As such, in the process of performing the fifth step S5 in the first step S1, a bifocal lens having the same shape as the general lens is manufactured.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

1 is a side cross-sectional view of a bifocal lens according to the present invention;

2a to 2c are perspective views showing various forms of the near portion,

3 is a view for explaining a process of manufacturing a bifocal lens according to the present invention using the first and second molding mold,

4 is a view for explaining that the sub groove is formed in the lens base material manufactured in FIG.

FIG. 5 is a view for explaining that the second resin of FIG. 4 is hardened by filling a second resin having a large refractive index.

1 ... Lens base material 1a ... Remote part

1b ... Subhome 2 ... Near

10 ... first molding mold 10a ... convex surface

20 ... 2nd molding mold 20a ... concave

20b ... subconvex cotton T ... tape

C ... curved surface

Claims

A concave subgroove 1b is formed from the surface of the lens base 1 to be biased to one side at the center of the lens base material 1 constituting the remote portion 1a;

The bifocal lens, characterized in that the sub-groove (1b) is formed of a short-range portion (2) is implemented by filling the material of the refractive index larger than the lens base material (1).

The method of claim 1,

The bifocal lens, characterized in that the curvature of the curved surface is equal to the surface curvature of the remote portion (1a) and the near portion (2).

The method of claim 2,

Dual focus lens, characterized in that the thickness of the same radius at the center of the lens mother (1).

Subconvex surface having a first molding mold 10 having a convex surface 10a, and a concave surface 20a corresponding to the convex surface 10, which protrudes to one side from the center of the concave surface 20a. A first step (S1) of keeping the first molding mold 10 and the second molding mold 20 spaced apart from each other by using the second molding mold 20 having a 20b;

The first resin is filled and hardened between the first and second molding molds 10 and 20 to correspond to the remote portion 1a corresponding to the concave surface 20a and the sub-convex surface 20b. A second step (S2) of molding the lens mother 1 having the sub groove 1b to be formed;

A third step (S3) of separating the lens mother (1) from the first and second molding molds (10) (20);

Filling the sub groove (1b) of the lens mother (1) with a second resin having a refractive index larger than that of the lens mother (1) and solidifying (S4); And

And a fifth step (S5) in which the surface curvatures of the remote portion (1a) and the near portion (1b) are equally ground.

The method of claim 4, wherein the first step (S1),

Method of manufacturing a bifocal lens, characterized in that the first and second molding mold (10, 20) by winding the edge of the tape (T) to maintain the spaced apart state.