JP2004309993A

JP2004309993A - Lens for spectacles friendly to eyes and spectacles

Info

Publication number: JP2004309993A
Application number: JP2003130886A
Authority: JP
Inventors: Hideo Tsuneoka; 秀夫常岡
Original assignee: Hasegawa Optical Co Ltd
Current assignee: Hasegawa Optical Co Ltd
Priority date: 2003-04-02
Filing date: 2003-04-02
Publication date: 2004-11-04

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens for spectacles friendly to eyes and spectacles equipped therewith. <P>SOLUTION: In the lens for spectacles, (a) the change of a refractive index caused by the change of wavelength is within 0.05, (b) its Abbe number is ≥61 and (c) its luminous transmittance before applying a surface reflection reducing agent is ≥93% in a visible light region, and it is composed of 99.8 to 100 wt.% S<SB>i</SB>O<SB>2</SB>and 0 to 0.2 wt.% Al<SB>2</SB>O<SB>3</SB>, and far infrared emissivity is ≥95%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、人工水晶を使用した眼に優しい眼鏡用レンズ及び目に優しい眼鏡に関するものである。
【０００２】
【従来の技術】
従来より、眼鏡用レンズとしては、殆どがその加工のし易さから樹脂製のレンズが使用されて来ている。又少数では有るが光学ガラスレンズも使用されてはいる。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記樹脂製のレンズは、（イ）表面が柔らかいので傷つき易く、その為に表裏面にハードコーティングをしなければならず、レンズ表裏面に二重像が写り込み長時間使用すると眼が疲れてくる。（ロ）光透過率も良くなく、眼の疲労度が高まる事となる。（ハ）静電気の発生によりレンズ表裏面に埃が付き易く、又その静電気が眼に悪影響を与える。（ニ）曇り易く、曇った状態が長く続くので、車の運転中など危険な場合が生じている。又、光学ガラスレンズに於いては、Ｓ_ｉＯ_２の含有割合が２０％〜３５％前後で、多種類の添加物を加えなければならずその製造工程が複雑にならざるを得なかった。
【０００４】
【課題を解決するための手段】
そこで本発明に於いては上記課題を解決する為に、可視光域に於いて；
（ａ）波長の変化による屈折率の変化が０．０５以内で
（ｂ）アッベ数が６１以上で
（ｃ）表面反射防止剤塗布前の視感透過率が９３％以上であって
その組成が、９９．８〜１００重量％のＳ_ｉＯ_２と、０〜０．２重量％のＡｌ_２Ｏ_３とからなり、且つ、遠赤外線放射率が９５％以上である事を特徴とする、人工水晶よりなる目に優しい眼鏡用レンズ及び眼に優しい眼鏡を提供する。
【０００５】
【発明の実施の形態】
図１は、本発明の人工水晶レンズを可視光域（４００ｎｍ〜７００ｎｍ）の範囲で屈折率の変化を測定したグラフであり、縦軸（ｙ）は屈折率を表し、横軸（ｘ）は波長を表している。可視光域（４００ｎｍ〜７００ｎｍ）での屈折率が４００ｎｍに於いては、１．５９０で、７００ｎｍに於いては、１．５４０で、その間の波長の変化による屈折率の変化は０．０５以内で安定しており眼を疲れさせない。
【０００６】
更に図１に於いて、ｄ＝５８７ｎｍでの屈折率ｎ_ｄ＝１．５５２で、ｆ＝４８６ｎｍでの屈折率ｎ_ｆ＝１．５５９で、ｃ＝６５６ｎｍに対する屈折率ｎ_ｃ＝１．５５０であり、アッベ数は６１．３の高アッベ数を提示する。この事は特に、像欠陥を取り除く事や、色収差をなくし目を疲れさせないことになる。
【０００７】
次ぎに、図２は、慣例の表面反射防止剤を塗布する前の透過率を表しており、可視光域では９３％以上である。これに慣例の表面反射防止剤を塗布した後の視感透過率は９８％を超える。
【０００８】
又、表１は、本願発明の人工水晶レンズとガラスレンズ、及びプラスチックレンズの遠赤外線反射率と電磁波シールド性を比較した表である。周知の様に遠赤外線には眼の疲れ、肩こり、自律神経を穏やかにする効果があるといわれており、眼の周りの血行を良くし眼の疲れを取ると言う眼にも優しい効果が得られる。反面、ガラス及びプラスチックの場合にはそのような効果は認められない。又、最近のパソコンや電子機器が発する電磁波に対してもシールド性が若干有り眼の保護に役に立つ。又静電気の発生も無く、曇り難いという効果も有る。
【０００９】
【表１】

【００１０】
更に、表面硬度も７と非常に硬く傷が付き難く、したがってハードコートの必要が無く二重像の写り込みも無い。
【００１１】
又、製造方法に於いては、従前の水晶単結晶方法で良いが、原材料となる天然の水晶に特に純度の高いロシアのウクライナ産ものを厳選して作る事により本願発明の人工水晶レンズが可能となった。
【００１２】
【発明の効果】
以上の様に、本発明の人工水晶レンズにより、光透過率の良い、且つ高アッベ数を有し、静電気の発生も無く、遠赤外線放射率の良い、長時間の使用でも眼の疲れない且つ眼の周りの血行を良くし眼の疲れを癒す眼に優しい、傷の付き難い眼鏡レンズ及び該レンズを装備した眼に優しい眼鏡の提供が可能になった。
【図面の簡単な説明】
【図１】本発明の人工水晶レンズの可視光域での屈折率の変化グラフ
【図２】本発明の人工水晶レンズの透過率のグラフ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an eye-friendly eyeglass lens using artificial quartz and eye-friendly eyeglasses.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a lens made of resin has been used as an eyeglass lens because of its easiness in processing. Although a small number, optical glass lenses are also used.
[0003]
[Problems to be solved by the invention]
However, the lens made of the above resin is (a) easy to be scratched because the surface is soft, and therefore hard coating must be applied to the front and back surfaces. I get tired. (B) The light transmittance is not good, and the degree of eye fatigue increases. (C) Due to the generation of static electricity, dust easily adheres to the front and back surfaces of the lens, and the static electricity adversely affects the eyes. (D) It is easy to become cloudy, and the cloudy state lasts for a long time, which may cause dangerous cases such as driving a car. Also, at the optical glass lens, when the content ratio is around 20% to 35% of S _i O _2, the manufacturing process is inevitably complicated must added various kinds of additives.
[0004]
[Means for Solving the Problems]
Therefore, in the present invention, in order to solve the above problems, in the visible light range;
(A) the change in the refractive index due to the change in wavelength is within 0.05, (b) the Abbe number is 61 or more, and (c) the luminous transmittance before application of the surface antireflection agent is 93% or more, and the composition is , 99.8 to 100% by weight of SiO ₂ and _{0 to} 0.2% by weight of Al ₂ O ₃ , and the far-infrared emissivity is 95% or more. An eye-friendly eyeglass lens made of quartz and eye-friendly eyeglasses are provided.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a graph showing a change in the refractive index of the artificial quartz lens of the present invention in a visible light range (400 nm to 700 nm). The vertical axis (y) indicates the refractive index, and the horizontal axis (x) indicates the refractive index. It represents the wavelength. When the refractive index in the visible light region (400 nm to 700 nm) is 400 nm, the refractive index is 1.590, and when the refractive index is 700 nm, it is 1.540. It is stable within 05 and does not tire eyes.
[0006]
1, the refractive index n _{d at d} = 587 nm is 1.552, the refractive index at _f = 486 nm is n _f = 1.559, and the refractive index at c = 656 nm is n _c = 1.550. Yes, the Abbe number presents a high Abbe number of 61.3. In particular, this eliminates image defects and eliminates chromatic aberration so that the eyes are not tired.
[0007]
Next, FIG. 2 shows the transmittance before applying a conventional surface antireflection agent, which is 93% or more in the visible light region. The luminous transmittance after application of a conventional surface anti-reflection agent to this exceeds 98%.
[0008]
Table 1 is a table comparing the far-infrared reflectance and electromagnetic wave shielding properties of the artificial quartz lens, glass lens, and plastic lens of the present invention. As is well known, far infrared rays are said to have the effect of calming eyestrain, stiff shoulders and autonomic nervousness, and also has the effect of improving blood circulation around the eyes and reducing eye fatigue, which is gentle on the eyes. Can be On the other hand, in the case of glass and plastic, such an effect is not recognized. Also, it has some shielding properties against electromagnetic waves generated by recent personal computers and electronic devices, which is useful for protecting eyes. Further, there is also an effect that no static electricity is generated and the clouding is hardly caused.
[0009]
[Table 1]

[0010]
Further, the surface hardness is very hard at 7 and is hardly scratched. Therefore, there is no need for a hard coat and there is no reflection of a double image.
[0011]
In the manufacturing method, the conventional quartz single crystal method may be used. It became.
[0012]
【The invention's effect】
As described above, the artificial quartz lens of the present invention has good light transmittance, has a high Abbe number, does not generate static electricity, has good far-infrared emissivity, does not tire eyes even after long use, and It has become possible to provide an eye-friendly spectacle lens that improves blood circulation around the eye and relieves eye fatigue, is hardly damaged, and eye-friendly spectacles equipped with the lens.
[Brief description of the drawings]
FIG. 1 is a graph showing the change in the refractive index of the artificial quartz lens of the present invention in the visible light range. FIG. 2 is a graph showing the transmittance of the artificial quartz lens of the present invention.

Claims

A lens for spectacles, in the visible light range;
(A) the change in the refractive index due to the change in wavelength is within 0.05, (b) the Abbe number is 61 or more, and (c) the luminous transmittance before application of the surface antireflection agent is 93% or more, and the composition is , 99.8 to 100% by weight of SiO ₂ and _{0 to} 0.2% by weight of Al ₂ O ₃ , and the far-infrared emissivity is 95% or more. Eye-friendly lenses made of quartz that are easy on the eyes.

An eye-friendly eyeglass comprising the eyeglass lens according to claim 1.