JP2004333588A - Exhibition sample set for spectacle lens and sample exhibiting device for spectacle lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhibition sample set for a spectacle lens by which the characteristic of a progressive focus lens having different design concept is easily visually recognized. <P>SOLUTION: The exhibition sample lens set is constituted by combining a regular sample lens A consisting of a double-sided progressive refractive power lens, an auxiliary sample lens C on a front side and an auxiliary sample lens B on a rear side having lens shape nearly equal to the lens shape of respective lenses obtained in the case of bisecting the lens A to the front surface 21 side and the rear surface 22 side by a division surface 23 positioned in the middle in a thickness direction, and satisfies all the conditions that the lens curve of the front surface 21C of the lens C is equal to that of the front surface 21 of the lens A, the lens curve of the rear surface 22B of the lens B is equal to that of the rear surface 22 of the lens A, and the lens curve of the rear surface 22C of the lens C is equal to that of the front surface 21B of the lens B. It is characterized by fulfilling of all criteria. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００２８】
図５に戻って、サンプルレンズＣ及びサンプルレンズＢは、正規サンプルの眼鏡レンズ（サンプルレンズＡ）を肉厚方向の中間に位置する分割面２３で前面側と後面側に２分割した場合の各レンズ形状と略同等のレンズ形状を有する前面側の補助サンプル及び後面側の補助サンプルの比較用レンズである。
【００２９】
前面側の補助サンプルレンズＣの前面２１Ｃのレンズカーブは、正規サンプルレンズＡの前面２１のレンズカーブと同一に設定されている。また、後面側の補助サンプルレンズＢの後面２２Ｂのレンズカーブは、正規サンプルレンズＡの後面２２のレンズカーブと同一に設定されている。従って、前面側の補助サンプルレンズＣの前面２１Ｃと、後面側の補助サンプルレンズＢの後面２２Ｂには、正規サンプルレンズＡの前面２１及び後面２２の累進面と同等の累進面（累進要素）が形成されている。
【００３０】
また、正規サンプルレンズＡを前面側と後面側に仮想的に分割する分割面２３は、該分割面２３における表面屈折力が各部で一定となる曲率半径の球面として設定されている。その曲率半径としては、正規サンプルレンズＡの前面２１と後面２２の両方の面全体の平均的な曲率半径が選択されている。このように仮想的な分割面２３が球面形状に設定されていることにより、前面側の補助サンプルレンズＣの後面２２Ｃのレンズカーブと、後面側の補助サンプルレンズＢの前面２１Ｂのレンズカーブとが共に、分割面２３の曲率半径と同一の曲率半径を有する球面として形成されている。
【００３１】
曲率半径とは、レンズ各部を微少領域に分割し、その微小領域上の点に最も近似できる球面の半径のことである。レンズ全面と最も近い曲率半径を算出して近似するためには、最小自乗法などにより凹凸全面の任意の点を単一の曲率半径と比較し、その各点における乖離量の２乗の和またはその平方根である標準偏差を算出し、乖離量の２乗の和または標準偏差が最小になるような平均曲率半径を選定する。平均曲率半径とは、微小領域ではなく、レンズ全面の任意の点に対して前記標準偏差が最小になるような曲率半径のことである。
【００３２】
次に、後面側の補助サンプルレンズＢの前面（凸面）２１Ｂ、及び、前面側の補助サンプルレンズＣの後面（凹面）２２Ｃを球面形状とすることの理由について簡単に説明する。
【００３３】
前述の球面とは曲率半径が一定であることを示している。曲率半径Ｒ（ｍｍ）と表面屈折力Ｄは、素材屈折率をＮｅとすると次式で与えられる。
【００３４】
Ｄ＝｛（Ｎｅ−１）×１０００｝／Ｒ
【００３５】
上式により、表面屈折力Ｄは、素材屈折率Ｎｅと曲率半径Ｒに依存しており、互いに線形独立であることがわかる。従って、曲率半径Ｒ及び素材屈折率Ｎｅが一定であるならば、表面屈折力Ｄは一定となる。
【００３６】
まず、後面側の補助サンプルレンズＢについて検討してみる。
凸面（前面２１Ｂ）が球面であり凸面（前面２１Ｂ）側の曲率半径が一定の場合は、凸面（前面２１Ｂ）側の表面屈折力Ｄが凸面（前面２１Ｂ）の任意の位置で一定値となる。つまり、中心部や周辺部、それらの中間部分のすべての点で、透過度数に与える凸面（前面２１Ｂ）側表面屈折力が一定となる。従って、凸面凹面の透過度数は、そのまま凹面（後面２２Ｂ）側の表面屈折力の中心から周辺への変化量を表わすことになり、その結果、補助サンプルレンズＢを透過する透過光を目視することで、補助サンプルレンズＢの後面（凹面）２２Ｂ側のみの設計概念を直接確認することが可能となる。
【００３７】
同様に、前面側の補助サンプルレンズＣについて検討してみる。
凹面（後面２２Ｃ）が球面であり凹面（後面２２Ｃ）側の曲率半径が一定の場合は、凹面（後面２２Ｃ）側の表面屈折力Ｄが凹面（後面２２Ｃ）の任意の位置で一定値となる。つまり、中心部や周辺部、それらの中間部分のすべての点で、透過度数に与える凹面（後面２２Ｃ）側表面屈折力が一定となる。従って、凸面凹面の透過度数は、そのまま凸面（前面２１Ｃ）側の表面屈折力の中心から周辺への変化量を表わすことになり、その結果、補助サンプルレンズＣを透過する透過光を目視することで、補助サンプルレンズＣの前面（凸面）２１Ｃ側のみの設計概念を直接確認することが可能となる。
【００３８】
なお、後面側の補助サンプルレンズＢの肉厚及び前面側の補助サンプルレンズＣの肉厚は共に、正規サンプルレンズＡの肉厚の略半分とされ、外径は７５ｍｍφ、材質は屈折率１．７を有するプラスチックとされている。
【００３９】
上記の展示装置１０においては、このような構成のサンプルレンズＡ、Ｂ、Ｃが展示板１１の透孔１２Ａ、１２Ｂ、１２Ｃに装着され、各サンプルレンズＡ、Ｂ、Ｃの上にその説明表記がなされている。
【００４０】
従って、例えば、サンプルレンズＣについては、『凸面に累進要素を持つ非球面』の表示により、眼鏡レンズの前面（凸面）側のみの設計概念を知ることができる。また、サンプルレンズＢについては、『凹面に累進要素を持つ非球面』の表示により、眼鏡レンズの後面（凹面）側のみの設計概念を知ることができる。また、これらのサンプルレンズＢ、Ｃと比較することで、両面に累進要素を持つ正規サンプルレンズＡについては、『両面に累進要素を持つサンプルレンズ』の表示と併せて、前面と後面の累進要素の組み合わせによって所定の累進屈折力を得るものであることを確認することができる。
【００４１】
このような３種類のサンプルレンズＡ、Ｂ、Ｃをセットで使用する利点は、眼鏡レンズの前面のレンズ効果、後面のレンズ効果、前面と後面の組み合わせによるレンズ効果を、それぞれ個別に互いに比較しながら認識できることである。従って、一般の顧客にとっても、見た目で簡単に眼鏡レンズの前面と後面の設計概念の違いを認識することができる。特に、両面累進屈折力レンズの場合は、レンズ前面側の累進面によるレンズ効果と、レンズ後面側の累進面によるレンズ効果と、前後両面の累進面によるレンズ効果とを、それぞれ個別に互いに比較しながら理解することが可能となるので、設計概念の特徴の把握に有効である。
【００４２】
次にサンプルレンズＡ、Ｂ、Ｃの製造方法について説明する。
製造方法としては下記の方法が挙げられる。
（ａ）両面研磨方法
（ｂ）セミ品を使用した片面研磨方法
（ｃ）上下型の使用した「ＦＩＮＩＳＨ ＣＡＳＴ」方法
（ｄ）金型を使用したインジェクション方法
【００４３】
ここでは、（ｂ）のセミ品を使用した片面研磨方法について説明する。
まず手順１として、設計データの計算をする。計算の手順として最初に、眼鏡レンズの凸面（前面）側の累進要素を持つ非球面を設計し、次に凹面側の累進要素を持つ非球面を設計し、遠用部屈折力がＳ０．００Ｄ、近用部屈折力が２．００Ｄとなるようにレンズの肉厚を決定する。次いで、共通の球面（図５の分割面２３）の平均曲率半径を、凹面と凸面の面全体の平均的な曲率半径として算出する。
【００４４】
次に手順２として、前記手順１で設計した形状に合う適切な「ブランクス」をピックアップする。ブランクスは、サンプルレンズの枚数分の３枚用意する。３枚のうちの２枚のブランクスは、サンプルレンズＡ、Ｃを作るためのもので、凸面側に、前記手順１にて設計された眼鏡レンズの凸面側の累進要素を有する非球面が形成されている。凹面側は特に形状が指定されていなくてよい。また、凸面には、レンズの設計面の基準位置となるアライメント基準位置３１ａ、３１ｂ（図６参照）が刻印されている。アライメント基準位置３１ａ、３１ｂは、すべての加工基準となる位置である。残り１枚のブランクスは、サンプルレンズＢを作るためのもので、十分な中心肉厚のあるブランクスであれば、特に凹凸面の形状は問わない。
【００４５】
次に手順３として、サンプルレンズＢを作るためのブランクスに、凸面側（前面側）の球面加工をする。加工の手順としては、まず、凸面側をカーブジェネレータにて研削または切削することにより、手順１の設計値にもとづく曲率半径を有する球面のレンズ面を創成し、次にその面を研磨することによって表面状態を整えて鏡面を得る。
【００４６】
次に手順４として、凹面の加工を全サンプルレンズＡ、Ｂ、Ｃに対して行う。まず、サンプルレンズＡを作るためのブランクスの凹面側に、手順１にて算出された設計値に基づいて、累進要素を有する非球面を加工する。加工の手順としては、まず、凹面側をカーブジェネレータにて研削または切削することにより、所定のレンズ面を創成し、次にその面を研磨することによって表面状態を整えて鏡面を得る。これにより、両面非球面累進レンズよりなる正規サンプルレンズＡを得る。
【００４７】
一方、サンプルレンズＢを作るためのブランクスの凹面にも、正規サンプルレンズＡと同様の凹面加工を実施することで、サンプルレンズＢを得る。さらに、サンプルレンズＣを作るためのブランクスの凹面に、前記手順１にて算出した平均曲率半径を有する球面を加工して、つまり、カーブジェネレータにて研削または切削することでレンズ面を創成し、続いてその面を研磨によって表面状態を整えて鏡面加工することで、サンプルレンズＣを得る。
【００４８】
次に手順５として、各サンプルレンズＡ、Ｂ、Ｃのエッジングを行う。エッジングには、カーブジェネレータを使用し、必要に応じて、丸、楕円、四角、多角形、フレーム枠入れ形状などに加工する。
【００４９】
以上のようにして作製したサンプルレンズＡ、Ｂ、Ｃを展示板１１の各透孔１２Ａ、１２Ｂ、１２Ｃに装着することにより、図１、図２に示す展示装置１０を得ることができる。
【００５０】
ところで、正規サンプルレンズＡの半分の肉厚で補助サンプルレンズＢ、Ｃを作製しようとすると、中心部分の肉厚が薄くなり過ぎて製造が難しくなる場合がある。例えば、前記実施形態では、正規サンプルレンズＡの中心部肉厚を３ｍｍとしているから、その半分の肉厚で補助サンプルレンズＢ、Ｃを製作しようとすると、補助サンプルレンズＢ、Ｃの中心部肉厚は１．５ｍｍ程度となる。この値は、製造する上で厳しい場合がある。
【００５１】
そこで、次に述べる本発明の第２の実施形態の展示サンプルセットでは、補助サンプルレンズＢ、Ｃの中心部肉厚を、正規サンプルレンズＡの肉厚の半分よりも大きく設定している。
【００５２】
一般的な両面屈折力レンズの場合、製造上の制約から、中心部肉厚は２ｍｍ程度以上に設定するのが望ましい。ここでは、全てのサンプルレンズＡ、Ｂ、Ｃにおいて、遠用度数測定位置の度数がＳ０．００Ｄになるように設定する。
【００５３】
そのため、後面側の補助サンプルレンズＢの前面（凸面）２１Ｂ、及び、前面側の補助サンプルレンズＣの後面（凹面）２２Ｃの球面形状に関しては、中心部の肉厚が２ｍｍで、遠用部の度数がＳ０．００Ｄとなる曲率半径を有する球面を選択する。そして、前面側の補助サンプルレンズＣについては、前面（凸面）２１Ｃ側の非球面要素（累進要素を有する非球面）と対になるように、その後面（凹面）２２Ｃの球面形状を、先に選択した曲率半径の球面として加工する。
【００５４】
同様に、後面側の補助サンプルレンズＢについては、後面（凹面）２２Ｂ側の非球面要素（累進要素を有する非球面）と対になるように、その前面（凸面）２１Ｂの球面形状を、先に選択した曲率半径の球面として加工する。
【００５５】
また、正規サンプルレンズＡとしては、前記補助サンプルレンズＢ、Ｃと比較できるような形状を選択し、遠用度数測定位置の度数がＳ０．００Ｄとなるものを選定する。加入度数は任意の度数で構わないが、平均的な度数として、本例では２．００Ｄを用いることとする。
【００５６】
ところで、前記第１実施形態の展示サンプルセットにおいては、補助サンプルレンズＢの前面２１Ｂと補助サンプルレンズＣの後面２２Ｃを重ねあわせると、正規サンプルレンズＡと同等のレンズとなるように、肉厚さを含めたレンズ形状を設定してあったが、説明のしやすさを考えてみると、必ずしもそうすることが必要条件ではないことが分かる。つまり、説明することを主として考えると、各サンプルレンズで遠用度数測定位置の度数がＳ０．００Ｄに設定されていることが重要であると言うことができる。
【００５７】
この点、前記第２実施形態の展示サンプルセットの場合は、補助サンプルレンズＢ、Ｃの肉厚を正規サンプルレンズＡの肉厚の半分に設定していないので、補助サンプルレンズＢの前面２１Ｂと補助サンプルレンズＣの後面２２Ｃを重ねあわせて正規サンプルレンズＡと同等になることを示そうとしても、肉厚が一致しないことになる。しかし、実際には目で見てどのような性質の面であるかを確認することが主たる目的であるため、肉厚の違いは、見え方に変化が出ない限りあまり問題とはならない。
【００５８】
因みに、レンズの肉厚の違いによる屈折力への影響について評価してみる。
例えば、中心肉厚が２．００ｍｍ（例１）と４．００ｍｍ（例２）について比較すると、凹凸両面のカーブが同一の形状を有し、素材屈折率が同一であるレンズの場合、屈折力に与える影響は小さく、０．０２Ｄ（次表参照）程度となる。また、その影響の及ぶ範囲も、レンズ全面に均等に前記度数０．０２Ｄシフトすることになるため、設計概念を見るための中心部から周辺部への屈折力変化量に与える影響は全くないと見なせる。従って、肉厚が多少増えても見え方に問題はない。
【００５９】

【００６０】
次に、サンプルレンズＡ，Ｂ，Ｃの実例として各形状の例を以下に示す。なお、カーブ数値は屈折率１．６９９換算である。補助サンプルＢ、Ｃの分割面球面カーブ選定方法は両面複合累進屈折力レンズ（正規サンプルＡ）の前面側累進要素面における度数測定位置のカーブ（４．９７Ｄ）と後面側累進要素面における度数測定位置のカーブ（５．０６Ｄ）との平均値（５．０２Ｄ）とする。補助サンプルＢ、Ｃの肉厚の選定方法は、両面複合累進屈折力レンズ（正規サンプルＡ）の中心肉厚（６ｍｍ）の半分（３ｍｍ）とする。

【００６１】
Ｂ） 後面側補助サンプルＢ
Ｂ．１ 凸面側形状：正規サンプルＡ度数測定位置の凸面側カーブと凹面側カーブの平均値（５．０２Ｄ）をカーブ値とする球面
Ｂ．２ 凹面側形状：両面複合累進屈折力レンズの凹面側累進要素面
Ｂ．３ 凸面側球面のカーブ値：５．０２Ｄ
Ｂ．４ 凹面側遠用部分のカーブ値：５．０６Ｄ
Ｂ．５ 中心肉厚：３ｍｍ
【００６２】
Ｃ） 前面側補助サンプルＣ
Ｃ．１ 凸面側形状：両面複合累進屈折力レンズの凸面側累進要素面
Ｃ．２ 凹面側形状：正規サンプルＡ度数測定位置の凹面側カーブと凹面側カーブの平均値（５．０２Ｄ）をカーブ値とする球面
Ｃ．３ 凸面側遠用部分のカーブ値：４．９７Ｄ
Ｃ．４ 凹面側球面のカーブ値：５．０２Ｄ
Ｃ．５ 中心肉厚：３ｍｍ
【００６３】
なお、上述した実施形態では、サンプルレンズＡ、Ｂ、Ｃを展示装置１０に組み込んで顧客に提示する場合について主に説明したが、展示装置１０として組み込まずに、展示サンプルセットだけで説明するようにしてもよい。
【００６４】
その場合は、例えば、最初に前面側の補助サンプルレンズＣと後面側の補助サンプルレンズＢを示す。そして「凸面側（前面）に累進要素を持った非球面」の説明、及び、「凹面側（後面側）に累進要素を持った非球面」の説明をする。次に、両補助サンプルレンズＣ、Ｂの球面形状部の曲率半径が一致することを利用して、互いの球面部を組み合わせ密着させて、それが、両面に累進要素を持つ正規サンプルレンズＡと同一の効果を生むことを示す。
【００６５】
このようにすることで、両面に累進要素を持つ正規サンプルレンズＡが、両面の累進要素の組み合わせで初めて、所定の累進屈折力を得られることが直接分かるようになる。ただし、この場合は、レンズの幾何中心における回転方向を正確に重ねる必要があるため、サンプルレンズＢ、Ｃに位置合わせのための目印を付けて重ねるか、あるいは、サンプルレンズＢ、Ｃの外形を例えば多角形にしておき、サンプルレンズＢ、Ｃの外周形状を揃えて重ねるようにする。
【００６６】
一般的に顧客に情報を提示する場合には、前述のサンプルレンズＡ、Ｂ、Ｃの提示と共に、補足として別に資料（収差測定装置によるレンズ全面の透過屈折力を示す収差分布図及び設計データによる凹凸各面の表面屈折力分布図など）を提示することが望ましい。その際、資料の示す要素が、サンプルレンズのどの要素に対応するかを、サンプルレンズと比較しながら説明することが有効である。
【００６７】
なお、上記実施形態では、サンプルレンズ形状や透孔形状が円形の場合を主に示しているが、レンズ形状や透孔形状は円形に限らず、多角形、フレーム枠入れ形状などでもよく、レンズを取り出して確認しやすい形状にすることも可能である。また、サンプルレンズの並べ方についても限定されず、上述の例のように横に並べても、縦に並べても、また、斜めに並べたり、円周上に並べたりして表示することも可能である。また、展示装置１０の素材も、厚紙やプラスティック以外に木材や金属を使用してもよい。
【００６８】
また、前記実施形態では、対象が両面累進レンズの場合を示したが、片面累進レンズの場合も適用が可能であるし、その他の非球面レンズや自由曲面レンズについても適用が可能である。例えば、凹凸両面が非球面である「単焦点両面非球面屈折レンズ」などに適用することもできる。
【００６９】
【発明の効果】
以上説明したように、本発明によれば、実際に眼鏡レンズとして使用する正規サンプル、正規サンプルの厚さ方向の前半分に相当する前面側の補助サンプル、正規サンプルの厚さ方向の後半分に相当する後面側の補助サンプルの３枚のレンズをセットで用意しているので、眼鏡レンズの前面のレンズ効果、後面のレンズ効果、前面と後面の組み合わせによるレンズ効果を、それぞれ個別に互いに比較しながら理解することができる。従って、一般の顧客にとって、見た目で簡単に眼鏡レンズの前面と後面の設計概念の違いを認識することができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態の展示サンプルセットを組み込んだ展示装置の斜視図である。
【図２】同展示装置の正面図である。
【図３】同展示装置の側面図である。
【図４】同展示装置の平面図である。
【図５】本発明の展示サンプルセットにおける３種のサンプルレンズＡ、Ｂ、Ｃの関係を示す断面図である。
【図６】本発明の展示サンプルセットにおけるサンプルレンズＡの正面図である。
【符号の説明】
Ａ 正規サンプルレンズ
Ｂ 後面側の補助サンプルレン
Ｃ 前面側の補助サンプルレンズ
１０ 展示装置
１１ 展示板
１２Ａ，１２Ｂ，１２Ｃ 透孔
１５Ａ，１５Ｂ，１５Ｃ 説明表記部
２１，２１Ｂ，２１Ｃ 前面
２２，２２Ｂ，２２Ｃ 後面
２３ 分割面[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a set of display samples of spectacle lenses, and in particular, a front surface (also referred to as a surface opposite to the eyeball, an outer surface, or a convex surface) and a rear surface (also referred to as an eyeball-side surface, an inner surface, or a concave surface). The present invention relates to an eyeglass lens display sample set and an eyeglass lens sample display apparatus that are effective for assisting recognition of a design concept of a progressive power lens having a progressive power surface on at least one lens surface.
[0002]
[Prior art]
The spectacle store provides customers who purchase spectacle lenses with information, such as catalogs and samples, for understanding the functions, performance, design concepts, and the like. In particular, the presentation of the sample lens is a commonly used method since the customer can directly confirm the appearance and the transmission image. For example, by seeing the grid pattern or newspaper characters through the sample lens, it is possible to actually confirm the difference in the appearance of the transmitted image, and this is extremely effective especially for customers who purchase progressive power lenses. It can be said that this is a method of providing information.
[0003]
As other methods for presenting information, a method of graphically displaying the transmission aberration of the entire surface of the lens (for example, see Patent Document 1), a method of displaying an aberration diagram of the transmission refractive power simulated from lens design data, and the like ( For example, see Patent Literatures 2 and 3), design concepts based on design values or measured values of a front surface (convex surface) or a rear surface (concave surface) of a lens, a surface average refractive power distribution, a surface cylindrical refractive power distribution and its direction, a surface prism. There is a method (for example, refer to Patent Documents 4 and 5) in which each element such as a refractive distribution and its direction is displayed as a material and explained orally.
[0004]
[Patent Document 1]
Japanese Patent Application No. 2002-141159
[Patent Document 2]
JP-A-9-90295
[Patent Document 3]
JP-A-8-215149
[Patent Document 4]
JP 2000-186978 A
[Patent Document 5]
JP-A-2000-9586
[0005]
[Problems to be solved by the invention]
By the way, as the types of lenses provided as progressive power lenses for spectacles,
(A) Outer surface progressive lens having a progressive surface in front of the lens
(B) An inner surface progressive lens having a progressive surface behind the lens
(C) a double-sided compound progressive-power lens that forms a surface having progressive elements of different properties on the front surface and the rear surface, and combines these two surfaces to create progressive performance;
There is. (A) is a conventional product, (b) is a product developed in recent years, and (c) is a latest product.
[0006]
The difference between these lenses is based on the fundamental difference in the design concept, but it is difficult to understand the difference in the design concept only by presenting one sample lens. For example, whether there is a progressive surface on the front side, a progressive surface on the rear side, or whether there is a progressive element surface on both sides and a predetermined progressive refractive power is obtained by a combination of both sides, However, it was difficult to make the user recognize only by presenting one actual sample lens.
[0007]
That is, a spectacle lens obtains a lens refractive power by a combination of a front surface refractive power and a rear surface refractive power. When a lens is used, a transmitted image or the like is inevitably formed when the front and rear surfaces are inseparable from each other. Was confirmed, and it was not possible to independently recognize the individual designs of the front and rear surfaces.
[0008]
In this regard, the techniques disclosed in the above-mentioned patent publications were substantially the same. In other words, the method of displaying the transmission aberration of the entire surface of the lens graphically, or the method of displaying the aberration diagram of the transmission refractive power simulated from the design data of the lens, both show the refraction performance by the combination of the front surface and the rear surface of the lens. However, it is not possible to separately confirm the design concepts of the front and rear surfaces of the spectacle lens individually.
[0009]
In addition, the design concept can be defined based on the design value or measured value of the front surface (convex surface) or the rear surface (concave surface) of the lens, such as surface average refractive power distribution, surface cylindrical refractive power distribution and its direction, surface prism refractive distribution and its direction, and the like. The method of displaying each element as a document and explaining it orally may be an effective method when performed by some experts such as development sites, but as a method of presenting information to general customers, There was a fundamental problem that it was too technical and that it was not easy to recognize the difference by appearance.
[0010]
The present invention provides a display sample set of spectacle lenses and a display device thereof, in which a retail store or a general customer can easily visually recognize the features of a progressive lens having a different design concept in view of the above circumstances. The purpose is to do.
[0011]
[Means for Solving the Problems]
The display sample set of the spectacle lens according to the first means,
A spectacle lens as a regular sample, and a lens shape substantially equivalent to each lens shape in the case where the spectacle lens of the regular sample is divided into two on the front side and the rear side by a division surface located at any one of the middles in the thickness direction. Consisting of a combination of an auxiliary sample on the front side and an auxiliary sample on the rear side having
The front lens curve of the front auxiliary sample and the front lens curve of the regular sample are equivalent, the rear lens curve of the rear auxiliary sample and the rear lens curve of the regular sample are equivalent, The lens curve on the back side of the auxiliary sample on the side and the lens curve on the front side of the auxiliary sample on the back side satisfy the same condition.
[0012]
In this manner, the three lenses of the normal sample, the auxiliary sample on the front side corresponding to substantially the front half of the normal sample in the thickness direction, and the auxiliary sample on the rear side corresponding to substantially the rear half of the normal sample in the thickness direction are used. By preparing them as a set, the lens effect of the front surface, the lens effect of the rear surface, and the lens effect of the combination of the front surface and the rear surface of the spectacle lens can be understood while individually comparing each other. Therefore, even a general customer can easily recognize the difference between the design concepts of the front and rear surfaces of the spectacle lens visually.
[0013]
The invention according to the second means is the invention according to the first means,
The spectacle lens as the normal sample, a double-sided compound progressive-power lens that forms progressive surfaces having different properties on the front and rear surfaces and combines these two surfaces to create progressive performance, or at least the front or rear surface A progressive power lens having a progressive surface on one of the lens surfaces, and one or both of a front surface of the front-side auxiliary sample and a rear surface of the rear-side auxiliary sample, a progressive surface of the spectacle lens of the regular sample; A progressive surface element or a progressive surface equivalent to the element or the progressive surface is formed.
[0014]
Thus, when the spectacle lens is a progressive-power lens, the lens effect by the progressive surface can be individually confirmed. In particular, in the case of a double-sided progressive lens, the lens effect of the progressive element on the front surface side of the lens, the lens effect of the progressive element on the rear surface side of the lens, and the lens effect of both the front and rear progressive elements are understood while individually comparing each other. It can be said that it is particularly effective for grasping the characteristics of the design concept.
[0015]
The invention according to the third means is the invention according to the first means,
A display sample set of the spectacle lens according to the first or second means,
The divided surface is formed as a curved surface having an average curve value of a front lens curve and a rear lens curve at a power measurement position of a spectacle lens of a regular sample.
[0016]
The invention according to the fourth means is a display sample set of the spectacle lens according to any one of the first to third means,
The divided surface is set as a spherical surface having a radius of curvature such that the surface refractive power of the divided surface is constant at each portion, whereby the lens curve of the rear surface of the auxiliary sample on the front surface side and the lens curve of the auxiliary sample on the rear surface side are formed. It is characterized in that both of the front lens curves are formed as spherical surfaces having the same radius of curvature as the radius of curvature of the divided surface.
[0017]
The invention according to the fifth means is a display sample set of the spectacle lens according to the fourth means,
The average radius of curvature of the entire front and rear surfaces of the spectacle lens of the normal sample is selected as the radius of curvature of the divided surface having the spherical surface.
The invention according to the sixth means is a display sample set of the spectacle lens according to any one of the first to fifth means,
In order to display that the display sample obtained by combining the auxiliary sample on the front side and the auxiliary sample on the rear side with the divided surface as a mating surface has the same refractive power as the regular sample, the reference position of the superposition is set. It is provided in the auxiliary sample on the front side and the auxiliary sample on the rear side.
[0018]
An invention according to a seventh means is a spectacle lens sample display device for displaying a display sample set of the spectacle lens according to any one of the first to sixth means,
The three lenses of the regular sample, the auxiliary sample on the front side, and the auxiliary sample on the rear side are arranged side by side on one display board so that they can be seen through in the front-rear direction. Is provided with an explanation notation section in which an explanation about each lens is indicated at the margin position.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A spectacle lens obtains a total refracting power by a combination of a refracting action of a front surface of a lens and a rear surface of a lens. Usually, the front surface (outer surface) located on the side opposite to the eyeball side is convex, and is located on the eyeball side. The rear surface (inner surface) is concave. In the following, the terms “front” and “rear” are mainly used, but the terms “convex” and “concave” may be used in some cases.
[0020]
FIG. 1 is a perspective view of a display device displaying a spectacle lens display sample set according to the first embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a side view, and FIG. 4 is a plan view.
The display device 10 has three circular through-holes 12A, 12B, and 12C formed at equal intervals in a horizontal row on one rectangular display plate 11, and each of the through-holes 12A, 12B, and 12C has a circular sample lens. A, B, and C are mounted, and the display board 11 is set in a vertical posture by the legs 13. Here, the display board 11 and the legs 13 are made of cardboard, plastic, or the like.
[0021]
The display board 11 is made by laminating two boards to have sufficient strength, and by sandwiching the peripheral portions of the sample lenses A, B, and C between the two boards, the through holes 12A, 12B, and 12C are provided. Sample lenses A, B, and C are held at the position of. Therefore, it is possible to see through the sample lenses A, B, and C from the front side to the rear side and from the rear side to the front side.
[0022]
In addition, in the upper margin of the display board 11, description notation portions 15A, 15B, and 15C are provided, which are located above the sample lenses A, B, and C, and display descriptions about the sample lenses A, B, and C, respectively. I have. In each of the description units 15A, 15B, and 15C,
・ "3 HOALUX ID (S: 0.00 ADD: 2.00)"
・ "2 Aspherical surface with concave progressive element"
・ "1 Aspherical surface with convex progressive element"
Is described.
[0023]
Next, three sample lenses A, B, and C will be described with reference to FIG. FIG. 5 is a lens cross-sectional view along a straight line passing through the optical center and orthogonal to the horizontal reference line.
[0024]
The sample lens A is a spectacle lens as a regular sample actually used for spectacles. Here, a double-sided progressive refraction having progressive surfaces (progressive elements) on both a front surface (convex surface) 21 and a rear surface (concave surface) 22. Force lenses are used. That is, the sample lens A is constituted by an aspherical surface having progressive elements on both sides of the front surface 21 and the rear surface 22 and constituted by a double-sided progressive-power lens that obtains progressive refractive power by a combination of progressive elements on both surfaces 21 and 22. Have been.
[0025]
As shown in the front view of FIG. 6, the regular sample lens A has a distance portion 33 and a near portion 34, and the change from the distance portion 33 to the near portion 34 is constituted by a progressive refraction surface. It is. 35 is a design center, 36 is a horizontal reference line, 31a and 31b are alignment reference marks, and 32a and 32b are engraved marks. In FIG. 6, reference numeral 37 temporarily indicates target marks provided on the sample lenses B and C. That is, when the sample lenses B and C are superimposed on the sample lenses B and C to be described later and are virtually the same lens as the sample lens A, the target mark 37 which is a mark indicating the reference position of the superimposed position is horizontal reference. The lens 36 is provided on the outer periphery of the lens on the line 36 and on the lens on the vertical reference line.
[0026]
Here, the optical performance of the regular sample lens A is set as follows.
[0027]

[0028]
Returning to FIG. 5, the sample lens C and the sample lens B are obtained when the spectacle lens (sample lens A) of the regular sample is divided into two parts by the dividing surface 23 located in the middle in the thickness direction into the front side and the rear side. 9 is a comparative lens of a front-side auxiliary sample and a rear-side auxiliary sample having a lens shape substantially equivalent to the lens shape.
[0029]
The lens curve of the front surface 21C of the auxiliary sample lens C on the front side is set to be the same as the lens curve of the front surface 21 of the normal sample lens A. The lens curve of the rear surface 22B of the auxiliary sample lens B on the rear surface side is set to be the same as the lens curve of the rear surface 22 of the normal sample lens A. Accordingly, the front surface 21C of the front auxiliary sample lens C and the rear surface 22B of the rear auxiliary sample lens B have progressive surfaces (progressive elements) equivalent to the progressive surfaces of the front surface 21 and the rear surface 22 of the regular sample lens A. Is formed.
[0030]
Further, the division surface 23 that virtually divides the normal sample lens A into the front surface side and the rear surface side is set as a spherical surface having a radius of curvature such that the surface refractive power of the division surface 23 is constant in each part. As the radius of curvature, an average radius of curvature of both the front surface 21 and the rear surface 22 of the regular sample lens A is selected. Since the virtual dividing surface 23 is set to have a spherical shape in this manner, the lens curve of the rear surface 22C of the auxiliary sample lens C on the front side and the lens curve of the front surface 21B of the auxiliary sample lens B on the rear side are different. Both are formed as spherical surfaces having the same radius of curvature as the radius of curvature of the dividing surface 23.
[0031]
The radius of curvature is a radius of a spherical surface that divides each part of a lens into a minute area and can approximate a point on the minute area most. In order to calculate and approximate the radius of curvature closest to the entire surface of the lens, an arbitrary point on the entire surface of the concavo-convex surface is compared with a single radius of curvature by a least square method or the like, and the sum of the squares of the amounts of deviation at each point or The standard deviation, which is the square root, is calculated, and the sum of the squares of the deviation amounts or the average radius of curvature that minimizes the standard deviation is selected. The average radius of curvature is a radius of curvature that minimizes the standard deviation at an arbitrary point on the entire surface of the lens, not in a minute area.
[0032]
Next, the reason why the front surface (convex surface) 21B of the rear-side auxiliary sample lens B and the rear surface (concave surface) 22C of the front-side auxiliary sample lens C are spherical will be briefly described.
[0033]
The above-mentioned spherical surface indicates that the radius of curvature is constant. The radius of curvature R (mm) and the surface refractive power D are given by the following equations, where the material refractive index is Ne.
[0034]
D = {(Ne-1) × 1000} / R
[0035]
From the above equation, it can be seen that the surface refractive power D depends on the material refractive index Ne and the radius of curvature R, and is linearly independent of each other. Therefore, if the radius of curvature R and the material refractive index Ne are constant, the surface refractive power D is constant.
[0036]
First, the auxiliary sample lens B on the rear side will be examined.
When the convex surface (front surface 21B) is a spherical surface and the radius of curvature on the convex surface (front surface 21B) side is constant, the surface refractive power D on the convex surface (front surface 21B) side has a constant value at an arbitrary position on the convex surface (front surface 21B). . In other words, the surface refractive power on the convex surface (front surface 21B) side applied to the transmittance is constant at all points of the central portion, the peripheral portion, and the intermediate portion between them. Therefore, the transmission power of the convex-concave surface directly represents the amount of change in the surface refractive power from the center to the periphery of the concave surface (rear surface 22B), and as a result, the transmitted light transmitted through the auxiliary sample lens B can be visually observed. Thus, it is possible to directly confirm the design concept only on the rear surface (concave surface) 22B side of the auxiliary sample lens B.
[0037]
Similarly, the auxiliary sample lens C on the front side will be examined.
When the concave surface (rear surface 22C) is spherical and the radius of curvature on the concave surface (rear surface 22C) side is constant, the surface refractive power D on the concave surface (rear surface 22C) side has a constant value at an arbitrary position on the concave surface (rear surface 22C). . In other words, the concave surface (rear surface 22C) -side surface refractive power applied to the transmittance is constant at all points in the central portion, the peripheral portion, and the intermediate portion therebetween. Therefore, the transmission power of the convex-concave surface directly represents the amount of change in the surface refractive power of the convex surface (front surface 21C) from the center to the periphery, and as a result, the transmitted light transmitted through the auxiliary sample lens C is visually observed. Thus, it is possible to directly confirm the design concept of only the front surface (convex surface) 21C side of the auxiliary sample lens C.
[0038]
The thickness of the auxiliary sample lens B on the rear side and the thickness of the auxiliary sample lens C on the front side are both approximately half the thickness of the regular sample lens A, the outer diameter is 75 mmφ, and the material is 1. 7 is a plastic.
[0039]
In the display device 10 described above, the sample lenses A, B, and C having such a configuration are mounted on the through holes 12A, 12B, and 12C of the display plate 11, and the explanatory notation is placed on each of the sample lenses A, B, and C. Has been made.
[0040]
Therefore, for example, for the sample lens C, the design concept of only the front (convex) side of the spectacle lens can be known by displaying “aspheric surface having a progressive element on the convex surface”. For the sample lens B, the design concept of only the rear surface (concave surface) side of the spectacle lens can be known by displaying “aspheric surface having a progressive element on the concave surface”. Further, by comparing these sample lenses B and C, the regular sample lens A having progressive elements on both sides is displayed together with “Sample lens having progressive elements on both sides”, and the progressive elements on the front and rear faces are displayed. It can be confirmed that a predetermined progressive refractive power is obtained by the combination of.
[0041]
The advantage of using these three types of sample lenses A, B, and C as a set is that the front lens effect, the rear lens effect, and the lens effect of the combination of the front and rear surfaces of the spectacle lens are individually compared with each other. It is possible to recognize while. Therefore, even a general customer can easily recognize the difference between the design concepts of the front and rear surfaces of the spectacle lens visually. In particular, in the case of a double-sided progressive-power lens, the lens effect by the progressive surface on the front surface side of the lens, the lens effect by the progressive surface on the rear surface side of the lens, and the lens effect by the progressive surfaces on both front and rear sides are individually compared with each other. This makes it possible to understand while designing, which is effective for grasping the characteristics of the design concept.
[0042]
Next, a method of manufacturing the sample lenses A, B, and C will be described.
The following method is mentioned as a manufacturing method.
(A) Double-side polishing method
(B) Single-side polishing method using semi-finished products
(C) "FINISH CAST" method using upper and lower molds
(D) Injection method using a mold
[0043]
Here, a single-side polishing method using the semi-finished product (b) will be described.
First, as a procedure 1, design data is calculated. As a calculation procedure, first, an aspheric surface having a progressive element on the convex (front) side of the spectacle lens is designed, then an aspheric surface having a progressive element on the concave surface is designed, and the distance portion refractive power is S0.00D. The thickness of the lens is determined so that the refractive power for the near portion becomes 2.00D. Next, the average radius of curvature of the common spherical surface (the divided surface 23 in FIG. 5) is calculated as the average radius of curvature of the entire concave and convex surfaces.
[0044]
Next, as a procedure 2, an appropriate “blank” matching the shape designed in the procedure 1 is picked up. Three blanks for the number of sample lenses are prepared. Two of the three blanks are used to make sample lenses A and C, and have an aspheric surface having a progressive element on the convex side of the spectacle lens designed in step 1 on the convex side. ing. The shape of the concave side need not be specified. Further, alignment reference positions 31a and 31b (see FIG. 6) serving as reference positions of the lens design surface are engraved on the convex surface. The alignment reference positions 31a and 31b are positions serving as all processing references. The remaining one blank is for producing the sample lens B, and the shape of the uneven surface is not particularly limited as long as the blank has a sufficient center thickness.
[0045]
Next, as a procedure 3, the blank for forming the sample lens B is subjected to spherical processing on the convex side (front side). As a processing procedure, first, a convex lens side is ground or cut with a curve generator to create a spherical lens surface having a radius of curvature based on the design value of procedure 1, and then the surface is polished. Condition the surface to obtain a mirror surface.
[0046]
Next, as a procedure 4, processing of the concave surface is performed on all the sample lenses A, B, and C. First, an aspherical surface having a progressive element is machined on the concave side of a blank for forming the sample lens A based on the design value calculated in the procedure 1. As a processing procedure, first, a predetermined lens surface is created by grinding or cutting the concave side with a curve generator, and then the surface state is adjusted by polishing the surface to obtain a mirror surface. Thus, a regular sample lens A composed of a double-sided aspherical progressive lens is obtained.
[0047]
On the other hand, the sample lens B is obtained by performing the same concave surface processing as the normal sample lens A on the concave surface of the blank for forming the sample lens B. Further, the concave surface of the blank for making the sample lens C is processed with a spherical surface having the average radius of curvature calculated in the above procedure 1, that is, a lens surface is created by grinding or cutting with a curve generator, Subsequently, the surface condition is adjusted by polishing and the surface is mirror-finished to obtain a sample lens C.
[0048]
Next, as a procedure 5, edging of each of the sample lenses A, B, and C is performed. For edging, a curve generator is used, and if necessary, it is processed into a circle, an ellipse, a square, a polygon, a framed shape, or the like.
[0049]
By mounting the sample lenses A, B, and C produced as described above in the through holes 12A, 12B, and 12C of the display board 11, the display apparatus 10 shown in FIGS. 1 and 2 can be obtained.
[0050]
By the way, if the auxiliary sample lenses B and C are to be manufactured with half the thickness of the regular sample lens A, the thickness of the central portion may be too thin to make the manufacture difficult. For example, in the above-described embodiment, the thickness of the central portion of the regular sample lens A is set to 3 mm. Therefore, if the auxiliary sample lenses B and C are manufactured with half the thickness, the thickness of the central portion of the auxiliary sample lenses B and C is reduced. The thickness is about 1.5 mm. This value may be severe in manufacturing.
[0051]
Therefore, in the display sample set of the second embodiment of the present invention described below, the thickness of the central portions of the auxiliary sample lenses B and C is set to be larger than half the thickness of the regular sample lens A.
[0052]
In the case of a general double-sided refractive power lens, it is desirable to set the thickness of the central portion to about 2 mm or more due to manufacturing restrictions. Here, in all the sample lenses A, B, and C, the power at the distance power measurement position is set to be S0.00D.
[0053]
Therefore, regarding the spherical shape of the front surface (convex surface) 21B of the rear-side auxiliary sample lens B and the rear surface (concave surface) 22C of the front-side auxiliary sample lens C, the center portion has a thickness of 2 mm and the distance portion has A spherical surface having a radius of curvature with a frequency of S0.00D is selected. For the auxiliary sample lens C on the front side, the spherical shape of the rear surface (concave surface) 22C is first set so as to be paired with the aspherical element (aspherical surface having a progressive element) on the front side (convex surface) 21C side. Process as a spherical surface with the selected radius of curvature.
[0054]
Similarly, the spherical shape of the front surface (convex surface) 21B of the auxiliary sample lens B on the rear surface side is set so as to be paired with the aspherical element (aspheric surface having a progressive element) on the rear surface (concave surface) 22B side. Is processed as a spherical surface having a radius of curvature selected in.
[0055]
Further, as the regular sample lens A, a shape that can be compared with the auxiliary sample lenses B and C is selected, and a lens whose power at the distance power measurement position is S0.00D is selected. The addition power may be any power, but in this example, 2.00D is used as an average power.
[0056]
By the way, in the display sample set of the first embodiment, when the front surface 21B of the auxiliary sample lens B and the rear surface 22C of the auxiliary sample lens C are overlapped with each other, the thickness is set so that the lens becomes equivalent to the regular sample lens A. Although the lens shape including is set, it is understood from consideration of ease of explanation that this is not always a necessary condition. In other words, it can be said that it is important that the power of the distance power measurement position is set to S0.00D in each sample lens when mainly considering the description.
[0057]
In this regard, in the case of the display sample set of the second embodiment, since the thickness of the auxiliary sample lenses B and C is not set to half of the thickness of the regular sample lens A, the front sample 21B of the auxiliary sample lens B Even if the rear surface 22C of the auxiliary sample lens C is superimposed to show that it is equivalent to the normal sample lens A, the wall thicknesses do not match. However, since the main purpose is to actually confirm what kind of surface the surface is, the difference in thickness is not a problem unless the appearance changes.
[0058]
By the way, let us evaluate the influence on the refractive power due to the difference in the thickness of the lens.
For example, comparing a center thickness of 2.00 mm (Example 1) and a thickness of 4.00 mm (Example 2), in the case of a lens having the same shape on both the concave and convex surfaces and the same material refractive index, the refractive power Has a small effect and is about 0.02D (see the following table). In addition, the range of the influence is also shifted by the power 0.02D evenly over the entire surface of the lens, so that there is no effect on the amount of change in refractive power from the center to the periphery for viewing the design concept. Can be considered. Therefore, there is no problem in the appearance even if the thickness is slightly increased.
[0059]

[0060]
Next, examples of each shape are shown below as actual examples of the sample lenses A, B, and C. Note that the curve values are converted to a refractive index of 1.699. The method of selecting the divided surface spherical curves of the auxiliary samples B and C is based on the curve (4.97D) of the power measurement position on the front-side progressive element surface and the power measurement on the rear-side progressive element surface of the double-sided compound progressive-power lens (normal sample A). The average value (5.02D) with the position curve (5.06D) is used. The thickness of the auxiliary samples B and C is selected to be half (3 mm) the center thickness (6 mm) of the double-sided composite progressive-power lens (regular sample A).

[0061]
B) Back side auxiliary sample B
B. 1 Convex side shape: spherical surface with the average value (5.02D) of the convex side curve and concave side curve at the normal sample A frequency measurement position as the curve value
B. 2 Concave side shape: concave side progressive element surface of double-sided composite progressive power lens
B. 3 Curve value of convex spherical surface: 5.02D
B. 4. Curve value of concave side far vision part: 5.06D
B. 5 center thickness: 3mm
[0062]
C) Front side auxiliary sample C
C. 1 Convex-side shape: convex-side progressive element surface of double-sided compound progressive-power lens
C. 2 Concave side shape: spherical surface having a concave side curve at the normal sample A frequency measurement position and an average value (5.02D) of the concave side curve as a curve value
C. 3 Curve value of the far side portion on the convex side: 4.97D
C. 4 Curve value of concave spherical surface: 5.02D
C. 5 center thickness: 3mm
[0063]
In the above-described embodiment, the case where the sample lenses A, B, and C are incorporated into the display device 10 and presented to the customer is mainly described. It may be.
[0064]
In that case, for example, the auxiliary sample lens C on the front side and the auxiliary sample lens B on the rear side are shown first. A description will be given of “aspherical surface having a progressive element on the convex side (front surface)” and “aspherical surface having a progressive element on the concave side (rear surface side)”. Next, utilizing the fact that the radii of curvature of the spherical shape portions of the two auxiliary sample lenses C and B coincide, the spherical portions of the two sample lenses are combined and brought into close contact with each other to form a regular sample lens A having progressive elements on both surfaces. Indicates the same effect.
[0065]
This makes it possible to directly understand that the normal sample lens A having progressive elements on both sides can obtain a predetermined progressive power only by a combination of progressive elements on both sides. However, in this case, since the rotation directions at the geometric centers of the lenses must be accurately overlapped, the sample lenses B and C may be marked with alignment marks and overlapped, or the outer shapes of the sample lenses B and C may be changed. For example, the sample lenses B and C are formed in a polygonal shape and the outer peripheral shapes of the sample lenses B and C are aligned and overlapped.
[0066]
In general, when presenting information to a customer, in addition to the presentation of the sample lenses A, B, and C described above, a supplementary document (an aberration distribution diagram showing the transmission refracting power of the entire surface of the lens by an aberration measuring device and design data) is used. It is desirable to present a surface refractive power distribution diagram of each surface of the irregularities. At this time, it is effective to explain which element of the sample lens corresponds to the element indicated by the material, while comparing it with the sample lens.
[0067]
In the above embodiment, the case where the shape of the sample lens and the shape of the through hole are mainly circular is shown, but the shape of the lens and the shape of the through hole are not limited to the circle, but may be a polygon, a framed shape, or the like. It is also possible to take out and make it easy to confirm. Also, the arrangement of the sample lenses is not limited, and it is also possible to arrange them horizontally, vertically, or diagonally or circumferentially as in the above example. . The material of the display device 10 may be wood or metal other than cardboard or plastic.
[0068]
Further, in the above-described embodiment, the case where the object is a double-sided progressive lens is shown. However, the present invention can be applied to a single-sided progressive lens, and can also be applied to other aspheric lenses and free-form surface lenses. For example, the present invention can also be applied to a “single-focal double-sided aspherical refraction lens” having both aspherical surfaces.
[0069]
【The invention's effect】
As described above, according to the present invention, the regular sample actually used as a spectacle lens, the auxiliary sample on the front side corresponding to the first half in the thickness direction of the regular sample, and the rear half in the thickness direction of the regular sample Since a set of three lenses of the corresponding auxiliary sample on the rear side is prepared, the lens effect of the front of the spectacle lens, the lens effect of the rear surface, and the lens effect of the combination of the front and rear surfaces are individually compared with each other. While you can understand. Therefore, a general customer can easily recognize the difference between the design concepts of the front and rear surfaces of the spectacle lens visually.
[Brief description of the drawings]
FIG. 1 is a perspective view of a display device incorporating a display sample set according to a first embodiment of the present invention.
FIG. 2 is a front view of the display device.
FIG. 3 is a side view of the display device.
FIG. 4 is a plan view of the display device.
FIG. 5 is a cross-sectional view showing the relationship between three types of sample lenses A, B, and C in the display sample set of the present invention.
FIG. 6 is a front view of a sample lens A in the display sample set of the present invention.
[Explanation of symbols]
A Regular sample lens
B Auxiliary sample ren on rear side
C Auxiliary sample lens on the front side
10 Exhibition equipment
11 Display board
12A, 12B, 12C Through hole
15A, 15B, 15C Description section
21, 21B, 21C Front
22, 22B, 22C Rear
23 Dividing surface

Claims (7)

A spectacle lens as a regular sample, and a lens shape substantially equivalent to each lens shape in the case where the spectacle lens of the regular sample is divided into two on the front side and the rear side by a division surface located at any one of the middles in the thickness direction. Consisting of a combination of an auxiliary sample on the front side and an auxiliary sample on the rear side having
The front lens curve of the front auxiliary sample and the front lens curve of the regular sample are equivalent, the rear lens curve of the rear auxiliary sample and the rear lens curve of the regular sample are equivalent, An eyeglass lens exhibit sample set, wherein the lens curve on the rear surface of the auxiliary sample on the side and the lens curve on the front surface of the auxiliary sample on the rear side are all equal. It is a display sample set of the spectacle lens according to claim 1,
The spectacle lens as the normal sample, a double-sided compound progressive-power lens that forms progressive surfaces having different properties on the front and rear surfaces and combines these two surfaces to create progressive performance, or at least the front or rear surface A progressive power lens having a progressive surface on one of the lens surfaces, and one or both of a front surface of the front-side auxiliary sample and a rear surface of the rear-side auxiliary sample, a progressive surface of the spectacle lens of the regular sample; An eyeglass lens display sample set, wherein a progressive surface element or a progressive surface equivalent to the element or the progressive surface is formed. It is a display sample set of the spectacle lens according to claim 1 or 2,
An eyeglass lens display sample set, wherein the divided surface is formed as a curved surface having an average curve value of a front lens curve and a rear lens curve at a power measurement position of a normal sample eyeglass lens. An eyeglass lens display sample set according to any one of claims 1 to 3,
The divided surface is set as a spherical surface having a radius of curvature such that the surface refractive power of the divided surface is constant at each portion, whereby the lens curve of the rear surface of the auxiliary sample on the front surface side and the lens curve of the auxiliary sample on the rear surface side are formed. A display sample set for an eyeglass lens, wherein both the front lens curve and the front lens curve are formed as a spherical surface having the same radius of curvature as the radius of curvature of the split surface. An eyeglass lens display sample set according to claim 4,
An eyeglass lens display sample set, wherein an average radius of curvature of both the front surface and the rear surface of the spectacle lens of the normal sample is selected as the radius of curvature of the divided surface having the spherical surface. It is a display sample set of the spectacle lens according to any one of claims 1 to 5,
In order to display that the display sample obtained by combining the auxiliary sample on the front side and the auxiliary sample on the rear side with the divided surface as a mating surface has the same refractive power as the regular sample, the reference position of the superposition is set. A display sample set of spectacle lenses, which is provided in the auxiliary sample on the front side and the auxiliary sample on the rear side. An eyeglass lens sample display device for displaying an eyeglass lens display sample set according to any one of claims 1 to 6,
The three lenses of the regular sample, the auxiliary sample on the front side, and the auxiliary sample on the rear side are arranged side by side on one display board so that they can be seen through in the front-rear direction. An eyeglass lens sample display device, wherein an explanation notation section in which an explanation of each lens is indicated is provided at a margin position of (1).

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