JP3215253U - Color contact lens - Google Patents

Abstract

The present invention provides a color contact lens that greatly improves safety and comfort during wearing. A color contact lens has an optical part 201, a peripheral part 202 surrounding the periphery, and an arc-shaped lens body 2 divided into a pattern part 203 arranged between the optical part 201 and the peripheral part 202. The lens body 2 has a relatively convex surface 21 and a concave surface 22, an outer layer 23 that faces the convex surface 21, and an inner layer 24 that faces the concave surface 22, and the outer layer 23 and the inner layer The pattern portion 203 sandwiched between 24 has the colored layer 25, and the thickness of the outer layer 23 is in the range of 10 μm to 50 μm, so that the colored layer 25 is not exposed to the outside and at the same time the eyeball or eyelid of the wearer Do not contact with. [Selection] Figure 2

Description

  The present invention relates to an improvement in a color contact lens for enhancing safety and comfort during wearing.

  Recently, technological advances are remarkable, and electrical and electronic products such as smartphones, tablet PCs, notebook PCs, TVs, etc. that have no time to spare have dramatically changed the conventional lifestyle, and human eyes are from screen to screen As myopia is gradually becoming a civilization of modern people, the demand for contact lenses is increasing as the population of myopia increases. Contact lenses are generally used to correct vision, but with the progress of manufacturing technology, lenses with different shapes and colors have begun to be designed, and products such as corneal discoloration lenses and color lenses that combine vision correction and fashion have been born. . The material has also made great progress, and improvements in functionality, comfort and convenience are creating growth opportunities for the contact lens market. Contact lenses are popular among female consumers because they add to the use of vision correction, as well as the use of changing the color of the iris or making the eye appear larger by making the iris appear larger.

  The technology in the manufacturing process is continually progressing as it changes from conventional contact lenses to corneal discoloration lenses and color lenses that combine vision correction and fashionability, and how to satisfy the functions of vision correction and fashionability. The major goal of major manufacturers is to expand the range of applications by combining comfort and safety. Well-known methods for producing color contact lenses are color pad printing and sandwich construction. However, in the colorant pad printing, the colored part is attached to the outermost surface of the lens, and the colored part 11 is on the surface of the lens body 10 (see FIG. 1). The colored portion 11 is easily dropped off and the colored portion 11 adheres to the outermost surface, so that the smoothness of the contact lens surface is lost, and the rough surface feels uncomfortable for the wearer. Furthermore, since the wearer's eyelids directly touch the colored part 11, there is a problem that the eyelids rub against the eyelids during the blinking process, and there is a potential risk of eye injury such as hyperemia, corneal neovascularization or allergic reaction. Yes, questions remain about the safety of wearing.

  Based on the above, the present invention provides an improved color contact lens for enhancing safety and comfort during wearing.

  The color contact lens in the present invention has an optical part, a peripheral part surrounding the periphery, and an arc-shaped lens body divided into the optical part and a pattern part arranged between the peripheral part. The lens body has a relatively convex surface and a concave surface, and the lens body has an outer layer facing the convex surface and an inner layer facing the concave surface, and between the outer layer and the inner layer. The sandwiched pattern portion has a colored layer, and the thickness of the outer layer is in the range of 10 μm to 50 μm, and the colored layer is not exposed to the outside and at the same time is not brought into contact with the eyeball or eyelid of the wearer, The safety and comfort when wearing are greatly improved.

  The colored layer of the color contact lens according to the present invention is sandwiched between the outer layer and the inner layer, and the thickness of the outer layer is in the range of 10 μm to 50 μm so that the colored layer is not exposed to the outside and at the same time the eyeball of the wearer In addition, it achieves the effect of not fading by not contacting with the eyelids, and eliminates the suspicion of safety caused by fading or fading of the conventional color contact lens, improving safety and comfort when wearing It is greatly improved. Furthermore, the lens body in the present invention accurately manages the thickness of the outer layer by using the mold rotation method and the casting method, and the thickness is within the range of 10 μm to 50 μm. In addition, the lens body contains a blue shortwave light absorber, ultraviolet (UV) absorber, or both to make the color contact lens of this creation, which is harmful blue shortwave in addition to fashion and vision correction function. Can have light filtering or anti-UV effect.

It is a general color contact lens structure diagram. 1 is a structural diagram of a color contact lens of the present invention. It is the 1st structure figure in the color contact lens manufacturing process of this invention. It is a 2nd structure figure in the color contact lens manufacturing process of this invention. It is the 3rd structure figure in the color contact lens manufacturing process of this invention.

  The structure of the color contact lens in the present invention is shown in FIG. The color contact lens in the present invention has an optical part 201, a peripheral part 202 surrounding the periphery, and an arc-shaped lens body 2 divided into the optical part and a pattern part 203 arranged between the peripheral part, The lens body 2 has a convex surface 21 and a concave surface 22 that are relatively disposed.

  In the present invention, the lens body 2 has an outer layer 23 facing the convex surface 21 and an inner layer 24 facing the concave surface 22, and the pattern sandwiched between the outer layer 23 and the inner layer 24. The portion 203 has one or more colored layers 25, and the thickness L1 of the outer layer 23 is in the range of 10 μm to 50 μm.

  As an excellent specific embodiment, when the lens body 2 of the present invention is manufactured, the rotary mold 31 is prepared in advance (see FIG. 3), and the material of the lens body is prepared. Manufactured with silicone hydrogel or third generation silicone hydrogel. As a more specific embodiment, the lens body 2 is made of hydrogel, and the hydrogel material is generally a polyacrylate simple substance. More specifically, as a well-known hydrogel component, , 2-hydroxyethyl methacrylate (HEMA), hydroxypropyl methacrylate (HPMA), methyl methacrylate (acrylic alone) (Methyl methacrylate, MMA), Glyceryl methacrylate (GMA), and combinations thereof. In the most specific embodiment, the lens body 2 is manufactured with a hydrogel of 2-hydroxyethyl methacrylate (HEMA) having a high water content of 55% to increase the hydrophilicity of the lens body 2.

  The lens body material is dropped into the rotary mold 31, and the outer layer 23 is manufactured in advance by a mold rotation method. That is, a smooth thin film is formed by utilizing the centrifugal force, weight, and surface tension during rotation of the rotary mold 31. In this case, the thickness of the outer layer 23 is accurately controlled by the mold rotation method, and the thickness is set within the range of 10 μm to 50 μm.

  Next, the colored layer 25 is formed inside the outer layer 23 by printing (see FIG. 4). As an excellent specific embodiment, a colorant to be a pigment is prepared, and the colorant containing the pigment is printed in an annular shape on the inner surface of the outer layer 23 by pad printing to produce a semi-finished product 26. Finish. Although the colored layer 25 described in the present specification and depicted in the drawings has a complete annular shape in the description of the present specification, the colored layer 25 is not limited to any technical field. Any pattern known to those with ordinary knowledge (such as halftone dots, patterns, figures, designs, or combinations of one or more geometric patterns). As another excellent specific embodiment, a plurality of colored layers 25 having different colors are printed on the inner side of the outer layer 23 to produce a colorful effect.

  Finally, the inner layer is manufactured by casting (see Fig. 5). A first mold 32 and a second mold 33 are prepared, and the semi-finished product 26 is placed on the first surface 321 (concave in this embodiment) of the first mold 32 (in this embodiment, a female mold). The material of the lens body is dropped again, and the second mold 33 (male in the present embodiment) having the second surface 331 (convex surface that meets the first surface 321 in the present embodiment) and the first mold 32 are slowly molded. After tightening, it is solidified by high temperature and pressure or photoreaction (such as UV irradiation), then released from mold and further hydrated to obtain a finished product.

  In the completed color contact lens product according to the present invention (see FIG. 2), the lens body 2 has a convex surface 21 facing the first mold and a concave surface 22 facing the second mold. The center thickness L2 of 2 (the vertical distance from the convex surface 21 to the concave surface 22 at the center of the lens body 2) is in the range of 60 μm to 150 μm, and the colored layer 25 of the main lens 2 is the outer layer 23 and the inner layer 24. Since the coloring layer is not exposed to the outside and at the same time is not brought into contact with the eyeball or eyelid of the wearer, the effect of preventing discoloration is achieved, so the color adhesion is high, and the thickness of the outer layer 23 L1 (vertical distance from the colored layer 25 to the convex surface 21) is in the range of 10 μm to 50 μm, and the thickness of the outer layer 23 is accurately controlled by the mold rotation method to expose the colored layer to the outside. As a result, safety and comfort when wearing are greatly improved. . As a more specific embodiment, the lens body contains a blue shortwave light absorber, an ultraviolet ray (UV) absorber, or both, and is a color contact lens of the present creation, which improves fashionability and vision correction. Besides function, it can have harmful blue shortwave light filtering or anti-UV effect.

L1, L2 Thickness 10 Lens body 11 Colored part 2 Lens body 201 Optical part 202 Peripheral part 203 Pattern part 21 Convex surface 22 Concave surface 23 Outer layer 24 Inner layer 25 Colored layer 26 Semi-finished product 31 Rotating mold 32 First mold 321 First surface 33 Second mold 331 Second surface

Claims (6)

The lens body has an arc-shaped lens body that is divided into an optical part, a peripheral part surrounding the periphery, and a pattern part arranged between the optical part and the peripheral part. The lens body has a convex surface and a concave surface relatively disposed;
The lens body has an outer layer facing the convex surface and an inner layer facing the concave surface, and the pattern portion sandwiched between the outer layer and the inner layer has one or more colored layers. A color contact lens, wherein the thickness of the outer layer is in the range of 10 μm to 50 μm.   2. The lens body according to claim 1, wherein after manufacturing the outer layer in advance using a mold rotation method, the colored layer is printed inside the outer layer, and finally the inner layer is manufactured by a casting method. Color contact lens.   The color contact lens according to claim 2, wherein the lens body is made of a hydrogel, a silicone hydrogel, or a third generation silicone hydrogel.   The color contact lens according to claim 3, wherein the lens body further contains a combination of a blue shortwave light absorber, a UV absorber, or both.   The color according to any one of claims 1 to 4, wherein the colored layer is composed of a complete annular pattern, a pattern, a halftone dot, a figure, a design, or a combination of one or more geometric patterns. contact lens.   The color contact lens according to any one of claims 1 to 4, wherein the center thickness of the lens body is in a range of 60 µm to 150 µm.