JPH06230319A - Ophthalmic lens with strippable sheet - Google Patents

Abstract

PURPOSE:To provide the lens which prevents the adhesion of dust on the lens surface and the generation of flaws thereon at the time of transporting the ophthalmic lens (including the semi-finished product of the lens) by providing the lens surface with a strippable sheet having an antistatic effect. CONSTITUTION:The R1 surface 2 which is the lens surface of the opthalmic lens 1 is provided with the strippable sheet 4 having the antistatic effect, by which the electrification between the lens surface and a packaging bag, etc., is prevented. The pickup of dust and dirt on the lens surface does not, therefore, arise and the generation of the flaws by friction does not arise any more. The labor for sticking a surface sheet to the lens surface at the time of polishing is eliminated. Further, the kind of the lens is clarified and the mishandling at the time of polishing does not arise by putting lens information (product name, lens diameter, curve, etc.) on the strippable sheet. This ophthalmic lens is effective for ophthalmic lenses made of a plastic having an easy tendency to electrification, for example, 'CR-39(R)', other acrylic, urethanic and styrenic synthetic resins.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens.

[0002]

2. Description of the Related Art In recent years, the mainstream of spectacle lenses is changing from glass lenses to plastic lenses. The plastic lens has a smaller specific gravity than the glass lens and is therefore lighter and has the advantage that it can be dyed, but on the other hand, it has the drawbacks that it is easily scratched and that dust and dirt tend to adhere. Therefore, when transporting plastic lenses molded into lens shapes (semi-finished products) to the next step (for example, polishing, coating, grinding, etc.), or when transporting them to retail stores as the final product, waste during transportation. It is necessary to prevent the adherence and scratches. Therefore, generally, the plastic lens is sandwiched between wrapping papers or put in a wrapping bag for transportation.

[0003]

However, in the conventional plastic lens packaging as described above, prevention of adhesion of dust and generation of scratches is still insufficient. If processing dust or dust adheres to the lens surface, it becomes difficult to remove it even by washing. The friction between the deposit and the lens causes scratches on the lens surface. In addition, scratches may occur on the lens surface due to friction between the lens and the packaging paper or packaging bag.

Further, when dust adheres to the semi-finished lens product before coating and remains as foreign matter in the coating film,
It becomes a defective product as a lens, which causes a decrease in yield. Therefore, it is an object of the present invention to provide a lens in which dust does not adhere to the lens surface when a spectacle lens (including a semi-finished lens product) is transported and a scratch is generated.

[0005]

The cause of the above problems is that a large amount of static electricity (static electricity) is generated between the lens surface and the wrapping paper or wrapping bag due to friction due to vibration during transportation. Due to this electrification, processing dust or dust is strongly adsorbed on the lens surface, causing scratches. Therefore, in the present invention, the above problem is solved by providing a strippable sheet having an antistatic effect on the lens surface for eliminating such charging (claim 1).

Further, the lens is taken out from the packaging bag for the steps such as polishing, but since the lens information (product name, lens diameter, curve, etc.) is conventionally added to the packaging bag, the lens is taken out from the packaging bag. I sometimes got the lenses wrong. Therefore, the spectacle lens of the present invention preferably has lens information (product name, product name) on the strippable sheet surface.
By adding the lens diameter, the curve, etc.), it is possible to prevent the lenses from being confused even when taken out from the packaging bag (claim 2).

[0007]

1 is a sectional view of a spectacle lens with a strippable sheet according to the present invention. In the spectacle lens of the present invention, by providing a strippable sheet having an antistatic effect on the lens surface (R1 surface in FIG. 1), it is possible to prevent electrification between the lens surface and the packaging bag or the like. Dust and dust will not be adsorbed on the lens surface, and scratches will not occur due to friction.

When polishing the surface (R2 surface) required to obtain a lens having a desired power, a surface sheet to be attached to the opposite surface (R1 surface) is attached to prevent scratches on the lens surface. Attach the alloy for fixing to the grinder. The strippable sheet of the present invention can also be used in place of this, and the labor of sticking the surface sheet during polishing can be saved.

Further, by adding lens information (product name, lens diameter, curve, etc.) to the strippable sheet, the type of lens at the time of polishing can be clarified so that there is no misunderstanding. INDUSTRIAL APPLICABILITY The present invention is effective for plastics that are easily charged, such as CR-39 (diethylene glycol bisacryl carbonate) and other acrylic, urethane, and styrene synthetic resin-based eyeglass lenses. The present invention is not limited to the above, but also applies to glass lenses.

The strippable sheet comprises, for example, an antistatic sheet and an adhesive layer provided on one surface thereof. As the antistatic sheet, a commercially available antistatic sheet such as LAPRASE (manufactured by Tonen Petrochemical), Mitsui Hybron Film (F) (manufactured by Mitsui Toatsu Chemical) or the like may be used.
For example, paper, fiber material, resin material, etc., which are impregnated, dipped, kneaded or coated with an antistatic agent are used.

The antistatic agent may be an anionic, cationic, amphoteric or nonionic surface active agent, such as sulfate ester salts, sulfonate salts, fatty acid salts, aliphatic amide sulfate salts, and fats. Group Alcohol Phosphate Ester Salts, Aliphatic Alcohol Sulfate Ester Salts, Alkyl Sulfonates, Alkyl Allyl Sulfonates, Alkyl Naphthalene Sulfonates, Alkylbenzene Sulfonates, Phosphate Ester Salts, Olefin Sulfate Ester Salts, Primary Amine salts, tertiary amine salts, quaternary ammonium salts, pyridine derivatives,
Examples include polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyalkyl esters, sorbitan alkyl esters, polyoxyethylene sorbitan alkyl esters, polyethylene glycol, carboxylic acid derivatives, imidazoline derivatives and the like. .

The strippable sheet has a thickness of 0.05.
It is about 0.3 mm. FIG. 2 shows a front view of the spectacle lens of the present invention in which lens information is added to the surface of the strippable sheet. The additional lens information includes, for example, a product name, lens diameter, curve, base material name, addition degree, center thickness, and the like. Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

[0013]

EXAMPLE A 1% solution of N-lauryldiethanolamine was brought to 40 ° C., and SIMON, COBURN,
A commercially available surface saver (stripperable sheet) manufactured by Nippon Synthetic Chemical Co., Ltd. was soaked for about 30 minutes and left at room temperature for 1 hour. A strippable sheet having this antistatic effect was attached to the R1 surface of the semi-finished spectacle lens product after molding. Lens information (product name, lens diameter, curve, addition degree, etc.) is added to the strippable sheet.

The electrification voltage of the semi-finished spectacle lens product before sticking the strippable sheet was about -1 KV. We prepared two lenses with the strippable sheet stuck in a paper lens packaging bag, rubbed the bags 10 times, and measured the charged voltage of the inside lens, which was about -1 KV.
There was no increase in electrification voltage due to friction and there was no scratch on the lens surface.

<Comparative example> A surface saver (stripperable sheet) having the same antistatic effect as that of the example.
The lens with and without the lens were put in a paper lens packaging bag, and the bags were rubbed with each other 10 times. As a result, a large amount of scratches were formed on the surface of the lens without the strippable sheet.

[0016]

In the spectacle lens of the present invention, a strippable sheet is provided on the lens surface to protect the surface and prevent the lens from being scratched during taking in and out of the package and during transportation. Further, due to the antistatic effect of the strippable sheet, electrification due to friction between the lens and the wrapping paper is prevented, and dust and dirt are not adsorbed. Therefore, scratches on the lens surface and contamination of foreign matter in the coating film are eliminated, and defective products can be reduced, so that the yield is improved. Further, since it can also be used as a surface sheet attached to the lens surface during polishing, the step of providing the surface sheet can be omitted.

In a preferred embodiment, the lens information is added to the strippable sheet so that the lenses taken out from the packaging bag or the like will not be mixed up.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention in which an eyeglass lens is provided with a strippable sheet.

FIG. 2 is a front view of an embodiment of the present invention provided with a strippable sheet for an eyeglass lens, viewed from the R1 surface.

[Explanation of symbols]

 1 Eyeglass lens 2 R1 surface 3 R2 surface 4 Strippable sheet

Claims (2)

[Claims] 1. A spectacle lens having a strippable sheet on the surface for protecting the surface and for preventing static electricity. 2. The spectacle lens according to claim 1, wherein lens information is added to the strippable sheet.