JP5832765B2 - Progressive power lens and design method thereof - Google Patents

Progressive power lens and design method thereof Download PDF

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JP5832765B2
JP5832765B2 JP2011060471A JP2011060471A JP5832765B2 JP 5832765 B2 JP5832765 B2 JP 5832765B2 JP 2011060471 A JP2011060471 A JP 2011060471A JP 2011060471 A JP2011060471 A JP 2011060471A JP 5832765 B2 JP5832765 B2 JP 5832765B2
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貴照 森
貴照 森
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イーエイチエス レンズ フィリピン インク
イーエイチエス レンズ フィリピン インク
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Description

本発明は、眼鏡用の累進屈折力レンズおよびその設計方法に関するものである。   The present invention relates to a progressive power lens for spectacles and a design method thereof.

特許文献１には、累進多焦点レンズにおいて、累進多焦点レンズの中央基準線に沿っての加入度数の勾配を充分に緩やかにし、かつその線上での非点収差も小さく抑え、さらに遠用部領域内の明視域（非点収差０．５デイオプトリー以下の部分）の幅を従来より大幅に小さくすることにより、中間部領域に広く良好な視野をもち、像の揺れも少ない累進多焦点レンズを実現することが記載されている。また、そのレンズを使用した眼鏡において枠入加工時のアイポイントを中央基準線上の遠用中心より近用中心の方向に５ｍｍないし１５ｍｍ離れた位置に定めることにより、中・近距離での視作業に適した眼鏡を実現することが記載されている。   In Patent Document 1, in a progressive multifocal lens, the gradient of the addition power along the central reference line of the progressive multifocal lens is made sufficiently gentle, and astigmatism on the line is kept small. A progressive multifocal lens with a wide and good field of view in the middle area and less image fluctuations by making the width of the clear vision area (part of astigmatism less than 0.5 diopters) significantly smaller than before. It is described to realize. In eyeglasses using the lens, the eye point at the time of frame insertion processing is set at a position 5 mm to 15 mm away from the distance center on the central reference line in the direction of the near vision center, thereby allowing visual work at medium and near distances. It is described that glasses suitable for the above are realized.

特許文献２には、広い中間部と近用部を確保し、全体に揺れの少ない近用視、中間視を重視した累進多焦点レンズを提供することが記載されている。そのため、レンズの幾何中心Ｏの上方１４ｍｍの位置に遠用度数測定位置Ｆ、レンズの幾何中心Ｏの下方１７．５ｍｍかつ鼻側内方２．５ｍｍの位置に近用度数測定位置Ｎ、レンズの幾何中心Ｏの水平方向鼻側１．０ｍｍの位置にレンズの装用者が正面視をしたときに視線の通過する位置であるアイポイント位置Ｅを設け、レンズ上の遠用度数測定位置Ｆの位置を中心として水平右側を０°の基準方向としたとき、３０°方向から１５０°方向に至る略扇形の領域Ｄｆを遠用明視域とし、この領域における非点収差を０．５０ジオプター以下にすることが記載されている。さらに、遠用度数測定位置Ｆとアイポイント位置Ｅ及び近用度数測定位置Ｎの３点を通ってレンズを「鼻側部分」と「耳側部分」に分割する主注視線は、該主注視線によって分割された２つの面部分が該主注視線を挾んで水平方向に非対称となるように構成されることが記載されている。   Patent Document 2 describes that a progressive multifocal lens that secures a wide intermediate portion and a near vision portion and places little emphasis on near vision and intermediate vision is provided. Therefore, the distance power measurement position F is 14 mm above the geometric center O of the lens, the near power measurement position N is 17.5 mm below the geometric center O of the lens, and 2.5 mm on the inner side of the nose. An eye point position E, which is a position through which the line of sight passes when the lens wearer looks in front, is provided at a position 1.0 mm in the horizontal nose side of the geometric center O, and the position of the distance power measurement position F on the lens. When the horizontal right side is set to 0 ° as the reference direction, a substantially fan-shaped region Df extending from the 30 ° direction to the 150 ° direction is defined as the far vision region, and astigmatism in this region is 0.50 diopter or less. It is described to do. Further, the main gaze line that divides the lens into the “nose side portion” and the “ear side portion” through the three points of the distance power measurement position F, the eye point position E, and the near power measurement position N is the main focus line. It is described that two surface portions divided by the line of sight are configured to be asymmetric in the horizontal direction with respect to the main line of sight.

特許文献３には、中間視力領域及び近用視力領域に渡る距離及び溝幅の機能的損失なしに不必要なレンズ非点収差を減少させる累進多焦点レンズおよびその製造方法を提供することが記載されている。そのため、特許文献３の累進多焦点レンズは、最大、かつ局在化した不要な非点収差からなる少なくとも一つの領域と第１の屈折付加力とを持つ第１の累進屈折面と、最大、かつ局在化した不要な非点収差からなる少なくとも一つの領域と第２の屈折付加力とを持つ第２の累進屈折面とを有する。また、この累進多焦点レンズは、不必要な非点収差の一部分あるいはすべてが位置ずれするように、第１の累進屈折面及び第２の累進屈折面は相互に関係した形で配置され、さらにレンズの屈折付加力は前記第１の屈折付加力及び前記第２の屈折付加力の合計となっている。   Patent Document 3 describes that a progressive multifocal lens that reduces unnecessary lens astigmatism without a functional loss of distance and groove width over the intermediate vision region and the near vision region and a method for manufacturing the same are described. Has been. Therefore, the progressive multifocal lens of Patent Document 3 includes a first progressive refraction surface having a maximum and localized at least one region of unnecessary astigmatism and a first refractive addition force, a maximum, And having at least one region consisting of localized unwanted astigmatism and a second progressive refractive surface having a second refractive addition force. In this progressive multifocal lens, the first progressive refractive surface and the second progressive refractive surface are arranged in relation to each other so that a part or all of unnecessary astigmatism is displaced. The refractive addition power of the lens is the sum of the first refractive addition power and the second refractive addition power.

特開昭６２−１０６１７号公報JP-A-62-1617 特開平０８−２８６１５６号公報JP-A-08-286156 特開２０００−１５５２９４号公報JP 2000-155294 A

近年、パーソナルコンピュータのディスプレイを注視しながら仕事をする機会が増加している。眼球からディスプレイまでの距離は６０ｃｍ〜８０ｃｍで遠用視と近用視との中間であり、遠用部および近用部に限らず、それらの間でも物体が見やすい眼鏡レンズが要望されている。   In recent years, opportunities to work while gazing at the display of a personal computer are increasing. The distance from the eyeball to the display is 60 cm to 80 cm, which is intermediate between distance vision and near vision, and there is a demand for a spectacle lens that is easy to see objects not only in the distance and near vision areas.

本発明の一態様は、目視度数の異なる遠用部および近用部と、遠用部および近用部の間に位置する中間部とを有する眼鏡用の累進屈折力レンズであって、中間部が、遠用部に繋がり、第１の目視度数勾配Ｄ１を備えた第１の領域と、近用部に繋がり、第２の目視度数勾配Ｄ２を備えた第２の領域と、第１の領域および第２の領域の間に位置する第３の領域であって、第３の目視度数勾配Ｄ３を備えた第３の領域とを含み、第１の目視度数勾配Ｄ１、第２の目視度数勾配Ｄ２および第３の目視度数勾配Ｄ３は以下の条件を満たす、累進屈折力レンズである。
｜Ｄ３｜＜ＭＩＮ（｜Ｄ１｜、｜Ｄ２｜）・・・（１）
ただし、ＭＩＮは最小値を示す関数である。 One aspect of the present invention is a progressive power lens for spectacles having a distance portion and a near portion having different visual powers, and an intermediate portion located between the distance portion and the near portion, wherein the intermediate portion Is connected to the distance portion, the first region having the first visual power gradient D1, the second region having the second visual power gradient D2, which is connected to the near portion, and the first region And a third region located between the second region and a third region having a third visual power gradient D3, the first visual power gradient D1, the second visual power gradient D2 and the third visual power gradient D3 are progressive power lenses that satisfy the following conditions.
| D3 | <MIN (| D1 |, | D2 |) (1)
However, MIN is a function indicating a minimum value.

この累進屈折力レンズは、目視度数の異なる遠用部と近用部とを接続する中間部に、目視度数勾配Ｄ３が上下の第１の領域および第２の領域の目視度数勾配Ｄ１およびＤ２より小さい第３の領域を含む。したがって、第３の領域を介して物体を見ることにより目視度数の変化による倍率変化やゆれなどが少ない像を得ることができ、物体を中間距離でも見やすい累進屈折力レンズを提供できる。   In this progressive-power lens, the visual power gradient D3 is higher than the visual power gradients D1 and D2 of the upper and lower first regions and the second region at the intermediate portion connecting the distance portion and the near portion having different visual powers. Includes a small third region. Therefore, by viewing the object through the third region, it is possible to obtain an image with little change in magnification or fluctuation due to a change in the visual power, and it is possible to provide a progressive power lens that allows easy viewing of the object even at an intermediate distance.

第３の領域はフィッティングポイントを含むことが好ましい。物体を中間距離で注視することの多いユーザーに対しては、使用頻度の高い中間視の部分にフィッティングポイントを選択することができる。   The third region preferably includes a fitting point. For users who often watch an object at an intermediate distance, it is possible to select a fitting point for the frequently used intermediate vision portion.

第１から第３の領域は、物体側の面または眼球側の面のいずれか一方の面の累進面を適切に設計することにより設けることができる。また、中間部の物体側の面が主注視線に沿った座標Ｐ１から座標Ｐ２の間で面屈折力が変化する第１の累進面を含み、中間部の眼球側の面が主注視線に沿った座標Ｐ３から座標Ｐ４の間で面屈折力が変化する第２の累進面を含み、座標Ｐ１、Ｐ２、Ｐ３およびＰ４はそれぞれ異なり、以下の条件を満たす累進屈折力レンズは有効である。
Ｐ１＞Ｐ２・・・（２）
Ｐ３＞Ｐ４・・・（３） The first to third regions can be provided by appropriately designing the progressive surface of either the object side surface or the eyeball side surface. The intermediate object side surface includes a first progressive surface whose surface refractive power changes between coordinates P1 and P2 along the main gaze line, and the intermediate eyeball side surface is the main gaze line. A progressive power lens that includes a second progressive surface whose surface refractive power varies between the coordinate P3 and the coordinate P4 along which the coordinates P1, P2, P3, and P4 are different from each other and satisfies the following conditions is effective.
P1> P2 (2)
P3> P4 (3)

ここで、主注視線に沿った座標が大きいとは、その座標の位置が前記遠用部に近いことを意味する。そして、主注視線に沿った座標が小さいとは、その座標の位置が前記近用部に近いことを意味する。   Here, a large coordinate along the main gazing line means that the position of the coordinate is close to the distance portion. And that the coordinate along the main gaze line is small means that the position of the coordinate is close to the near-use part.

物体側の面と眼球側の面とに、主注視線に沿った異なる範囲に面屈折力が変化する累進面、すなわち、第１の累進面および第２の累進面をそれぞれ設けることにより、第１から第３の領域を含む中間部を備えた累進屈折力レンズを設計し易く、諸収差の補正も行いやすい。   By providing progressive surfaces whose surface refractive power changes in different ranges along the main gaze line on the object side surface and the eyeball side surface, that is, the first progressive surface and the second progressive surface, respectively. It is easy to design a progressive-power lens having an intermediate portion including the first to third regions, and to easily correct various aberrations.

第１の累進面および第２の累進面は同傾向の目視度数勾配を付与する面であってもよい。この場合、座標Ｐ１、Ｐ２、Ｐ３およびＰ４は、さらに、以下の条件（４）および（５）のいずれかを満たし、第１の累進面および第２の累進面との間の領域に第３の領域を設けることができる。
Ｐ２＞Ｐ３・・・（４）
Ｐ１＜Ｐ４・・・（５） The first progressive surface and the second progressive surface may be surfaces that impart a visual power gradient having the same tendency. In this case, the coordinates P1, P2, P3, and P4 further satisfy any one of the following conditions (4) and (5), and the third coordinate is in the region between the first progressive surface and the second progressive surface. Can be provided.
P2> P3 (4)
P1 <P4 (5)

条件（４）および（５）のいずれかを選択することにより、物体側の面と眼球側の面とは主注視線に沿った異なる位置に同傾向の目視度数勾配を付与するように面屈折力が変化する累進面を含む。そして、条件（４）を採用した場合は、座標Ｐ２と座標Ｐ３との間に第３の領域を設けることができる。条件（５）を採用した場合は、座標Ｐ４と座標Ｐ１との間に第３の領域を設けることができる。   By selecting one of the conditions (4) and (5), the object-side surface and the eyeball-side surface are surface-refracted so as to give the same visual power gradient to different positions along the main line of sight. Includes progressive surfaces with varying forces. When the condition (4) is adopted, a third region can be provided between the coordinates P2 and the coordinates P3. When the condition (5) is employed, a third region can be provided between the coordinates P4 and the coordinates P1.

第１の累進面および第２の累進面が逆傾向の目視度数勾配を付与した逆累進面であってもよい。この場合、座標Ｐ１、Ｐ２、Ｐ３およびＰ４は、さらに、以下の条件のいずれかを満たし、第２の累進面または第１の累進面が第１の累進面または第２の累進面の面屈折力勾配をキャンセルすることにより第３の領域を設けることができる。
Ｐ１＞Ｐ３かつＰ２＜Ｐ４・・・（６）
Ｐ１＜Ｐ３かつＰ２＞Ｐ４・・・（７） The first progressive surface and the second progressive surface may be reverse progressive surfaces provided with a visual power gradient having a reverse tendency. In this case, the coordinates P1, P2, P3, and P4 further satisfy any of the following conditions, and the second progressive surface or the first progressive surface is the surface refraction of the first progressive surface or the second progressive surface. The third region can be provided by canceling the force gradient.
P1> P3 and P2 <P4 (6)
P1 <P3 and P2> P4 (7)

本発明の他の態様の１つは、上記の累進屈折力レンズと、累進屈折力レンズが取り付けられた眼鏡フレームとを有する眼鏡である。   Another aspect of the present invention is a pair of spectacles having the progressive-power lens described above and a spectacle frame to which the progressive-power lens is attached.

さらに、本発明の他の異なる態様の１つは、目視度数の異なる遠用部および近用部と、遠用部および近用部の間に位置する中間部とを有する眼鏡用の累進屈折力レンズの設計方法である。この設計方法は、中間部に、遠用部に繋がり、第１の目視度数勾配Ｄ１を備えた第１の領域と、近用部に繋がり、第２の目視度数勾配Ｄ２を備えた第２の領域と、第１の領域および第２の領域の間に位置する第３の領域であって、第３の目視度数勾配Ｄ３を備えた第３の領域とを設けることを有し、第１の目視度数勾配Ｄ１、第２の目視度数勾配Ｄ２および第３の目視度数勾配Ｄ３は上記条件（１）を満たす。   Furthermore, another different aspect of the present invention is a progressive power for glasses having a distance portion and a near portion having different visual powers, and an intermediate portion located between the distance portion and the near portion. This is a lens design method. In this design method, the intermediate portion is connected to the distance portion, the first region having the first visual power gradient D1, and the second region is connected to the near portion and has the second visual power gradient D2. Providing a region and a third region located between the first region and the second region, the third region having a third visual power gradient G3, The visual power gradient G1, the second visual power gradient D2, and the third visual power gradient D3 satisfy the above condition (1).

本発明のさらに異なる他の態様の１つは、物体側の面を設計することと、物体側の面を設計することと前後してあるいは同時に眼球側の面を設計することとを有する累進屈折力レンズの設計方法である。物体側の面を設計することは、中間部に含まれる第１の累進面であって、主注視線に沿った座標Ｐ１から前記座標Ｐ１より小さい座標Ｐ２の間で面屈折力が変化する第１の累進面を設計することを含み、眼球側の面を設計することは、中間部に含まれる第２の累進面であって、主注視線に沿った座標Ｐ３から座標Ｐ３より小さい座標Ｐ４の間で第１の累進面と同傾向の目視度数勾配を付与するように面屈折力が変化する第２の累進面を設計することを含み、座標Ｐ１、Ｐ２、Ｐ３およびＰ４が上記条件（４）および（５）のいずれかを満たす。   One of the other different aspects of the present invention is that progressive refraction includes designing an object-side surface, designing an object-side surface, and designing an eyeball-side surface before or after or simultaneously. This is a design method for a force lens. Designing the object-side surface is the first progressive surface included in the intermediate portion, and the surface refractive power changes between the coordinate P1 along the main gazing line and the coordinate P2 smaller than the coordinate P1. Designing one progressive surface, and designing the eyeball-side surface is a second progressive surface included in the intermediate portion, and is a coordinate P4 smaller than the coordinate P3 from the coordinate P3 along the main line of sight Design a second progressive surface whose surface refractive power varies so as to give a visual power gradient having the same tendency as the first progressive surface, and coordinates P1, P2, P3 and P4 satisfy the above condition ( Either 4) or (5) is satisfied.

本発明のさらに異なる他の態様の１つは、物体側の面を設計することと、物体側の面を設計することと前後してあるいは同時に眼球側の面を設計することとを有する累進屈折力レンズの設計方法であり、物体側の面を設計することは、中間部に含まれる第１の累進面であって、主注視線に沿った座標Ｐ１から座標Ｐ１より小さい座標Ｐ２の間で面屈折力が変化する第１の累進面を設計することを含み、眼球側の面を設計することは、中間部に含まれる第２の累進面であって、主注視線に沿った座標Ｐ３から座標Ｐ３より小さい座標Ｐ４の間で第１の累進面と逆傾向の目視度数勾配を付与するように面屈折力が変化する第２の累進面を設計することを含み、座標Ｐ１、Ｐ２、Ｐ３およびＰ４が上記条件（６）および（７）のいずれかを満たす。   One of the other different aspects of the present invention is that progressive refraction includes designing an object-side surface, designing an object-side surface, and designing an eyeball-side surface before or after or simultaneously. The force lens design method is to design the object side surface between the coordinates P1 along the main gaze line and coordinates P2 smaller than the coordinates P1. Designing the first progressive surface whose surface refractive power changes includes designing the eyeball-side surface as a second progressive surface included in the intermediate portion, and coordinates P3 along the main line of sight To design a second progressive surface whose surface refractive power changes so as to give a visual power gradient opposite to the first progressive surface between coordinates P4 smaller than coordinate P3, and coordinates P1, P2, P3 and P4 satisfy either of the above conditions (6) and (7).

本発明のさらに異なる他の態様の１つは、上記の設計方法により設計された累進屈折力レンズを製造することを含む、累進屈折力レンズの製造方法である。   Still another aspect of the present invention is a method for manufacturing a progressive-power lens, which includes manufacturing a progressive-power lens designed by the above-described design method.

眼鏡の一例を示す斜視図。The perspective view which shows an example of spectacles. 図２（ａ）は累進屈折力レンズの一方のレンズを模式的に示す平面図、図２（ｂ）はその断面図。FIG. 2A is a plan view schematically showing one of the progressive-power lenses, and FIG. 2B is a cross-sectional view thereof. 実施例１の累進屈折力レンズの外面、内面および目視の主注視線に沿った度数分布を示す図。The figure which shows the power distribution along the outer surface of the progressive-power lens of Example 1, an inner surface, and the visual main gaze line. 実施例１の累進屈折力レンズの外面（図４(ａ)）、内面（図４（ｂ））および目視（図４（ｃ））の非点収差分布を示す図。The figure which shows astigmatism distribution of the outer surface (FIG. 4 (a)), inner surface (FIG. 4 (b)), and visual observation (FIG. 4 (c)) of the progressive-power lens of Example 1. FIG. 実施例１の累進屈折力レンズの外面（図５(ａ)）、内面（図５（ｂ））および目視（図５（ｃ））の平均度数分布を示す図。The figure which shows the average frequency distribution of the outer surface (FIG. 5 (a)), inner surface (FIG. 5 (b)), and visual observation (FIG. 5 (c)) of the progressive-power lens of Example 1. FIG. 図６(ａ)は度数勾配が連続した中間部を含む累進屈折力レンズの概要を示す図、図６（ｂ）は度数勾配が不連続な中間部を含む累進屈折力レンズの概要を示す図。6A is a diagram showing an outline of a progressive-power lens including an intermediate portion having a continuous power gradient, and FIG. 6B is a diagram showing an overview of a progressive-power lens including an intermediate portion having a discontinuous power gradient. . 実施例２の累進屈折力レンズの外面、内面および目視の主注視線に沿った度数分布を示す図。The figure which shows the frequency distribution along the outer surface of the progressive-power lens of Example 2, an inner surface, and the visual main gaze line of visual observation. 実施例３の累進屈折力レンズの外面、内面および目視の主注視線に沿った度数分布を示す図。The figure which shows the power distribution along the outer surface of the progressive-power lens of Example 3, an inner surface, and the visual main gaze line. 実施例４の累進屈折力レンズの外面、内面および目視の主注視線に沿った度数分布を示す図。The figure which shows the power distribution along the outer surface of the progressive-power lens of Example 4, an inner surface, and the visual main gaze line. 実施例５の累進屈折力レンズの外面、内面および目視の主注視線に沿った度数分布を示す図。The figure which shows the frequency distribution along the outer surface of the progressive-power lens of Example 5, an inner surface, and the visual main gaze line of visual observation. 設計および製造過程の概要を示すフローチャート。The flowchart which shows the outline | summary of a design and manufacturing process.

図１は、眼鏡の一例を斜視図にて示している。図２（ａ）は、本発明の実施形態の１つの累進屈折力レンズの一方のレンズを平面図にて模式的に示している。図２（ｂ）は、その累進屈折力レンズの一方のレンズを断面図にて模式的に示している。   FIG. 1 is a perspective view showing an example of eyeglasses. FIG. 2A schematically shows one lens of one progressive-power lens according to the embodiment of the present invention in a plan view. FIG. 2B schematically shows one of the progressive-power lenses in a cross-sectional view.

本例では、使用者側（ユーザー側、着用者側、眼球側）からみて、左側を左、右側を右として説明する。この眼鏡１は、左眼用および右眼用の左右一対の眼鏡用レンズ１０Ｌおよび１０Ｒと、レンズ１０Ｌおよび１０Ｒをそれぞれ装着した眼鏡フレーム２０とを有する。眼鏡用レンズ１０Ｌおよび１０Ｒは、それぞれ、累進多焦点レンズ（累進屈折力レンズ）である。レンズ１０Ｌおよび１０Ｒの基本的な形状は物体側に凸のメニスカスレンズである。したがって、レンズ１０Ｌおよび１０Ｒは、それぞれ、物体側の面（凸面、以下外面ともいう）１９Ａと、眼球側（使用者側）の面（凹面、以下内面ともいう）１９Ｂとを含む。   In this example, as viewed from the user side (user side, wearer side, eyeball side), the left side is described as left and the right side is described as right. The spectacles 1 includes a pair of left and right spectacle lenses 10L and 10R for the left eye and right eye, and a spectacle frame 20 on which the lenses 10L and 10R are respectively mounted. The spectacle lenses 10L and 10R are progressive multifocal lenses (progressive power lenses), respectively. The basic shape of the lenses 10L and 10R is a meniscus lens convex on the object side. Therefore, each of the lenses 10L and 10R includes an object side surface (convex surface, also referred to as an outer surface) 19A and an eyeball side (user side) surface (a concave surface, also referred to as an inner surface) 19B.

図２（ａ）は右眼用レンズ１０Ｒを示している。このレンズ１０Ｒは、上方（主注視線に沿った座標が大きい方向に、主注視線に沿った遠用部の方向）の場所に遠距離の物を見る（遠方視の）ための視野部である遠用部１１を含み、下方（主注視線に沿った座標が小さい方向に、主注視線に沿った近用部の方向）の場所に遠用部１１と異なる度数（目視度数、屈折力）の近距離の物を見る（近方視の）ための視野部である近用部１２を含む。さらに、レンズ１０Ｒは、これら遠用部１１と近用部１２とを目視度数（屈折力）が変化するように連結する中間部（中間視のための部分、累進部、累進帯）１３を含む。また、レンズ１０Ｒは、遠方視・中間視・近方視をするときに視野の中心となるレンズ上の位置を結んだ主注視線１４を含む。この眼鏡用レンズ１０Ｒにおいては、フレーム枠に合わせて外周を成形し枠入れする際のレンズ上の基準点であるフィッティングポイントＦＰは中間部１３に位置する。   FIG. 2A shows the right-eye lens 10R. This lens 10 </ b> R is a visual field part for viewing an object at a long distance (for far vision) at a location above (in the direction where the coordinates along the main gazing line are large, the direction of the distance portion along the main gazing line). A certain distance portion 11 is included and is located at a lower position (in the direction of the near portion along the main gazing line in the direction in which the coordinates along the main gazing line are smaller) than the distance portion 11 (visual power and refractive power). ) Includes a near portion 12 that is a visual field portion for viewing an object at a short distance (for near vision). Furthermore, the lens 10R includes an intermediate portion (a portion for intermediate vision, a progressive portion, a progressive zone) 13 that connects the distance portion 11 and the near portion 12 so that the visual power (refractive power) changes. . The lens 10 </ b> R includes a main gaze line 14 that connects a position on the lens that is the center of the field of view when performing far vision, intermediate vision, and near vision. In the spectacle lens 10 </ b> R, the fitting point FP, which is a reference point on the lens when the outer periphery is shaped and framed in accordance with the frame, is located at the intermediate portion 13.

以下において、このフィッティングポイントＦＰをレンズの座標原点とし、フィッティングポイントＦＰを通る水平基準線Ｘの水平方向の座標をｘ座標、主注視線１４上の座標をｙ座標とする。主注視線１４は、フィッティングポイントＦＰを通る垂直基準線（主子午線）Ｙに対してフィッティングポイントＦＰを過ぎたあたりから鼻側に曲がる。主注視線１４と垂直基準線Ｙとの間隔を内寄せと称する。   Hereinafter, the fitting point FP is set as the coordinate origin of the lens, the horizontal coordinate of the horizontal reference line X passing through the fitting point FP is set as the x coordinate, and the coordinate on the main gazing line 14 is set as the y coordinate. The main gaze line 14 bends to the nose side after passing the fitting point FP with respect to the vertical reference line (main meridian) Y passing through the fitting point FP. The interval between the main gaze line 14 and the vertical reference line Y is referred to as inward alignment.

なお、以下において眼鏡用レンズとして右眼用の眼鏡用レンズ１０Ｒを中心に説明するが、眼鏡用レンズ、眼鏡レンズまたはレンズは左眼用の眼鏡用レンズ１０Ｌであってもよく、左眼用の眼鏡用レンズ１０Ｌは、左右の眼の眼鏡仕様の差を除けば基本的には右眼用の眼鏡用レンズ１０Ｒと左右対称の構成となる。また、以下においては、右眼用および左眼用の眼鏡用レンズ１０Ｒおよび１０Ｌを共通して眼鏡用レンズ（またはレンズ）１０と称する。   In the following description, the spectacle lens 10R for the right eye is mainly described as the spectacle lens. However, the spectacle lens, the spectacle lens, or the lens may be the spectacle lens 10L for the left eye. The eyeglass lens 10L is basically symmetrical to the right eyeglass lens 10R except for the difference in spectacle specifications between the left and right eyes. In the following description, the right-eye and left-eye spectacle lenses 10R and 10L are commonly referred to as spectacle lenses (or lenses) 10.

（実施例１）
図３に、実施例１の累進屈折力レンズ１０の物体側の面（外面）１９Ａの主注視線１４に沿った面屈折力ＯＰの変化と、眼球側の面（内面）１９Ｂの主注視線１４に沿った面屈折力ＩＰの変化と、外面１９Ａおよび内面１９Ｂの面屈折力により得られる目視度数（平均度数）ＡＰの変化とを模式的に示している。 Example 1
3 shows changes in the surface refractive power OP along the main gaze line 14 of the object-side surface (outer surface) 19A of the progressive-power lens 10 of Example 1, and the main gaze line of the eyeball-side surface (inner surface) 19B. 14 schematically shows a change in the surface refractive power IP along 14 and a change in the visual power (average power) AP obtained by the surface refractive power of the outer surface 19A and the inner surface 19B.

なお、この明細書において面屈折力および度数はディオプトリ（Ｄ）を単位として示し、内面１９Ｂの面屈折力ＩＰは絶対値で示す。主注視線１４に沿った目視度数ＡＰと、外面１９Ａの面屈折力ＯＰと、内面１９Ｂの面屈折力ＩＰとは近似的に以下の式により得られる。
ＡＰ＝ＯＰ−ＩＰ・・・（８） In this specification, the surface refractive power and power are shown in units of diopter (D), and the surface refractive power IP of the inner surface 19B is shown as an absolute value. The visual power AP along the main gazing line 14, the surface refractive power OP of the outer surface 19A, and the surface refractive power IP of the inner surface 19B are approximately obtained by the following equations.
AP = OP-IP (8)

実施例１の累進屈折力レンズ１０は、累進帯長２４ｍｍ、処方度数（遠用度数、Ｓｐｈ）が０．００（Ｄ）、加入度数（Ａｄｄ）が２．００（Ｄ）で設計したものである。なお、レンズ１０の直径は６５ｍｍであり、乱視度数は含まれていない。   The progressive-power lens 10 of Example 1 is designed with a progressive zone length of 24 mm, a prescription power (distance power, Sph) of 0.00 (D), and an addition power (Add) of 2.00 (D). is there. The lens 10 has a diameter of 65 mm and does not include astigmatism power.

外面１９Ａは、遠用部１１の面屈折力ＯＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰの上１０ｍｍから始まり、フィッティングポイントＦＰで終了しており、面屈折力ＯＰの変化分ΔＯＰは０．７５（Ｄ）である。すなわち、外面１９Ａは、面屈折力ＯＰが変化する第１の累進面１８Ａを含み、第１の累進面１８Ａの開始座標Ｐ１は遠用部１１と中間部１３との境界ＰＦであり、終了座標Ｐ２はフィッティングポイントＦＰとなっており、面屈折力ＯＰによる度数変化ＤＯＰは０．０７５（Ｄ／ｍｍ）である。   The outer surface 19A has a surface refractive power OP of 4.00 (D) for the distance portion 11 and a progressive zone length starting from 10 mm above the fitting point FP and ending at the fitting point FP. The minute ΔOP is 0.75 (D). That is, the outer surface 19A includes the first progressive surface 18A in which the surface refractive power OP changes, the start coordinate P1 of the first progressive surface 18A is the boundary PF between the distance portion 11 and the intermediate portion 13, and the end coordinate P2 is the fitting point FP, and the power change DOP due to the surface refractive power OP is 0.075 (D / mm).

一方、内面１９Ｂは、遠用部１１の面屈折力ＩＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰの４ｍｍ下（座標の小さい方、マイナス側）から始まり、フィッティングポイントＦＰの１４ｍｍ下で終わり、面屈折力ＩＰの変化分ΔＩＰは−１．２５（Ｄ）である。すなわち、内面１９Ｂは、面屈折力ＩＰが変化する第２の累進面１８Ｂを含み、第２の累進面１８Ｂの開始座標Ｐ３はフィッティングポイントＦＰの下側４ｍｍであり、終了座標Ｐ４は中間部１３と近用部１２との境界ＰＮとなっており、面屈折力ＩＰによる度数変化ＤＩＰ（絶対値）は０．０８９（Ｄ／ｍｍ）である。   On the other hand, the inner surface 19B has a surface refractive power IP of 4.00 (D) of the distance portion 11 and a progressive zone length starting from 4 mm below the fitting point FP (smaller coordinate, minus side). It ends below 14 mm, and the change ΔIP of the surface refractive power IP is −1.25 (D). That is, the inner surface 19B includes the second progressive surface 18B in which the surface refractive power IP changes, the start coordinate P3 of the second progressive surface 18B is 4 mm below the fitting point FP, and the end coordinate P4 is the intermediate portion 13. And the near portion 12 is a boundary PN, and the power change DIP (absolute value) due to the surface refractive power IP is 0.089 (D / mm).

したがって、第１の累進面１８Ａの座標Ｐ１は座標Ｐ２よりも大きく、第２の累進面１８Ｂの座標Ｐ３は座標Ｐ４よりも大きく、さらに、座標Ｐ２は座標Ｐ３よりも大きい。したがって、座標Ｐ１、Ｐ２、Ｐ３およびＰ４は、上記条件（２）、（３）および（４）を満足する。   Accordingly, the coordinate P1 of the first progressive surface 18A is larger than the coordinate P2, the coordinate P3 of the second progressive surface 18B is larger than the coordinate P4, and the coordinate P2 is larger than the coordinate P3. Therefore, the coordinates P1, P2, P3 and P4 satisfy the above conditions (2), (3) and (4).

累進屈折力レンズ１０の外面１９Ａおよび内面１９Ｂにより得られる目視度数ＡＰは、目視度数ＡＰが０．００（Ｄ）の遠用部１１と、目視度数ＡＰが２．００（Ｄ）の近用部１２と、遠用部１１と近用部１２との間で目視度数ＡＰが変化する中間部１３とを含む。さらに、中間部１３は、遠用部１１に繋がり、第１の目視度数勾配Ｄ１を備えた第１の領域１３１と、近用部１２に繋がり、第２の目視度数勾配Ｄ２を備えた第２の領域１３２と、第１の領域１３１および第２の領域１３２の間に位置する第３の領域１３３であって、第３の目視度数勾配Ｄ３を備えた第３の領域１３３とを含む。   The visual power AP obtained by the outer surface 19A and the inner surface 19B of the progressive-power lens 10 includes a distance portion 11 having a visual power AP of 0.00 (D) and a near portion having a visual power AP of 2.00 (D). 12 and an intermediate portion 13 in which the visual power AP changes between the distance portion 11 and the near portion 12. Further, the intermediate portion 13 is connected to the distance portion 11 and is connected to the first region 131 having the first visual power gradient D1 and the near portion 12 and is provided with the second visual power gradient D2. Region 132 and a third region 133 located between the first region 131 and the second region 132, and a third region 133 having a third visual power gradient D3.

第１の領域１３１の第１の目視度数勾配Ｄ１は第１の累進面１８Ａにより付与され、第１の目視度数勾配Ｄ１の近似的な値は０．０７５（Ｄ／ｍｍ）である。第２の領域１３２の第２の目視度数勾配Ｄ２は第２の累進面１８Ｂにより付与され、第１の目視度数勾配Ｄ２の近似的な値は０．０８９（Ｄ／ｍｍ）である。第３の領域１３３の第３の目視度数勾配Ｄ３は、外面１９Ａの第１の累進面１８Ａが終了した後の面と、内面１９Ｂの第２の累進面１８Ｂが開始する前の面とにより与えられ、第３の目視度数勾配Ｄ３の近似的な値は０．００（Ｄ／ｍｍ）である。したがって、第３の目視度数勾配Ｄ３は、第１の目視度数勾配Ｄ１および第２の目視度数勾配Ｄ２の最小値より小さく、第１の目視度数勾配Ｄ１、第２の目視度数勾配Ｄ２および第３の目視度数勾配Ｄ３は上記条件（１）を満たす。   The first visual power gradient D1 of the first region 131 is given by the first progressive surface 18A, and the approximate value of the first visual power gradient D1 is 0.075 (D / mm). The second visual power gradient D2 of the second region 132 is given by the second progressive surface 18B, and the approximate value of the first visual power gradient D2 is 0.089 (D / mm). The third visual power gradient D3 of the third region 133 is given by the surface after the first progressive surface 18A of the outer surface 19A ends and the surface of the inner surface 19B before the second progressive surface 18B starts. The approximate value of the third visual power gradient D3 is 0.00 (D / mm). Accordingly, the third visual power gradient D3 is smaller than the minimum value of the first visual power gradient D1 and the second visual power gradient D2, and the first visual power gradient D1, the second visual power gradient D2, and the third visual power gradient D2. The visual power gradient D3 satisfies the above condition (1).

図４（ａ）に外面１９Ａの非点収差分布を示し、図４（ｂ）に内面１９Ｂの非点収差分布を示し、図４（ｃ）に目視時の非点収差分布を示す。また、図５（ａ）に外面１９Ａの平均度数分布を示し、図５（ｂ）に内面１９Ｂの平均度数分布を示し、図５（ｃ）に目視時の平均度数分布を示す。図の縦横の直線は円形のレンズの幾何学中心を通る基準線（垂直基準線ｙおよび水平基準線ｘ）を示し、その交点である幾何学中心をフィッティングポイントとした眼鏡フレームへの枠入れ時の形状イメージも示されている。以下に示す図においても同様である。   4A shows the astigmatism distribution on the outer surface 19A, FIG. 4B shows the astigmatism distribution on the inner surface 19B, and FIG. 4C shows the astigmatism distribution when viewed. 5A shows an average frequency distribution of the outer surface 19A, FIG. 5B shows an average frequency distribution of the inner surface 19B, and FIG. 5C shows an average frequency distribution at the time of visual observation. The vertical and horizontal straight lines in the figure indicate the reference lines (vertical reference line y and horizontal reference line x) that pass through the geometric center of the circular lens, and the frame is put into the spectacle frame with the geometric center that is the intersection as the fitting point. The shape image is also shown. The same applies to the following drawings.

主注視線１４上において、フィッティングポイントＦＰから４ｍｍ下の間の第３の領域１３３の平均度数の度数勾配（第３の目視度数勾配Ｄ３）を計算した結果、第３の目視度数勾配Ｄ３は０．０２２（Ｄ／ｍｍ）であり、第１の目視度数勾配Ｄ１および第２の目視度数勾配Ｄ２よりも小さい値になることが分かった。このように、この累進屈折力レンズ１０においては、中間部１３の中で、外面１９Ａの第１の累進面１８Ａと、内面１９Ｂの第２の累進面１８Ｂの重なっていない第３の領域１３３は度数勾配Ｄ３が中間部１３の他の領域１３１および１３２の度数勾配Ｄ１およびＤ２よりも小さい。したがって、度数勾配の少ない領域１３３を中間部１３に備えた累進屈折力レンズ１０を提供できる。   As a result of calculating a power gradient of the average power (third visual power gradient D3) of the third region 133 between the fitting point FP and 4 mm below the main gaze line 14, the third visual power gradient D3 is 0. 0.02 (D / mm), which was found to be smaller than the first visual power gradient D1 and the second visual power gradient D2. Thus, in the progressive-power lens 10, in the intermediate portion 13, the third region 133 where the first progressive surface 18A of the outer surface 19A and the second progressive surface 18B of the inner surface 19B do not overlap is formed. The power gradient D3 is smaller than the power gradients D1 and D2 of the other regions 131 and 132 of the intermediate portion 13. Therefore, it is possible to provide the progressive addition lens 10 having the region 133 with a small power gradient in the intermediate portion 13.

図６（ａ）に度数勾配が均等あるいは連続した中間部１３を備えた累進屈折力レンズ１０ｘの遠用部１１と、近用部１２と、中間部１３とを模式的に示している。また、図６（ｂ）に度数勾配が不連続な中間部１３を備えた累進屈折力レンズ１０の遠用部１１と、近用部１２と、中間部１３とを模式的に示している。   FIG. 6A schematically shows the distance portion 11, the near portion 12, and the intermediate portion 13 of the progressive addition lens 10 x provided with the intermediate portion 13 having a uniform or continuous power gradient. FIG. 6B schematically shows the distance portion 11, the near portion 12, and the intermediate portion 13 of the progressive addition lens 10 having the intermediate portion 13 having a discontinuous power gradient.

図６（ａ）に示すように、累進開始点ＰＦから累進終了点ＰＮまでの間の中間部１３で目視度数（平均度数）ＡＰが連続して、あるいは均一な勾配で変化している累進屈折力レンズ１０ｘにおいては、使用頻度の高い中間距離、たとえば、パーソナルコンピュータ（ＰＣ）のディスプレイや大型ＴＶまでの距離などで使用する場合において、度数が連続して、あるいは継続して変化している部分（中間部）１３を使用していた。したがって、像の倍率が変化したり、像がゆれたりすることが多く、中間距離で快適な視野が得にくかった。   As shown in FIG. 6A, the progressive refraction in which the visual power (average power) AP changes continuously or at a uniform gradient in the intermediate portion 13 between the progressive start point PF and the progressive end point PN. In the power lens 10x, when the lens is used at a frequently used intermediate distance, for example, a distance to a display of a personal computer (PC) or a large TV, the frequency is continuously or continuously changed. (Intermediate part) 13 was used. Therefore, the magnification of the image often changes or the image is swayed, and it is difficult to obtain a comfortable visual field at an intermediate distance.

本件の累進屈折力レンズ１０では、図６（ｂ）に示すように、累進開始点ＰＦから累進終了点ＰＮまでの間の中間部１３に、度数の変化が他の中間部１３よりも小さく、実質的に度数変化がない第３の領域１３３が設けられている。したがって、使用頻度の高い中間距離で像を得る際に第３の領域１３３を用いることにより、像の倍率変化やゆがみを低減ができる。したがって、中間距離で快適な視野を備えた、中間距離の使用頻度の高いユーザーに適した累進屈折力レンズ１０を提供できる。また、度数変化の少ないあるいはない第３の領域１３３においては、主注視線１４も垂直基準線Ｙに対して平行に設定し、内寄せ量を変化させないようにしている。   In the progressive-power lens 10 of the present case, as shown in FIG. 6B, the change in the frequency is smaller in the intermediate portion 13 between the progressive start point PF and the progressive end point PN than in the other intermediate portions 13. A third region 133 having substantially no frequency change is provided. Therefore, by using the third region 133 when an image is obtained at an intermediate distance that is frequently used, a change in image magnification and distortion can be reduced. Therefore, it is possible to provide a progressive power lens 10 having a comfortable visual field at an intermediate distance and suitable for a user who frequently uses the intermediate distance. In the third region 133 with little or no frequency change, the main gazing line 14 is also set parallel to the vertical reference line Y so that the amount of inset is not changed.

さらに、実施例１の累進屈折力レンズ１０においては、外面１９Ａおよび内面１９Ｂの両面に累進部（第１の累進面１８Ａおよび第２の累進面１８Ｂ）を分けて設けている。したがって、中間視野領域の光学性能を維持したままレンズ製造ができる。また、中間部（累進部）１３の平滑化の影響を両面１９Ａおよび１９Ｂに分散することで、中間視野領域への影響を軽減できる。さらに、外面１９Ａと内面１９Ｂとでそれぞれ、必要とする加入度を与えることができるため、中間視野領域に必要とする中間距離用の加入度数を片面で制御するより安定した累進屈折力レンズ１０を製造できる。   Further, in the progressive addition lens 10 of the first embodiment, the progressive portions (the first progressive surface 18A and the second progressive surface 18B) are provided separately on both the outer surface 19A and the inner surface 19B. Therefore, the lens can be manufactured while maintaining the optical performance of the intermediate visual field region. Further, by dispersing the influence of smoothing of the intermediate portion (progressive portion) 13 on both surfaces 19A and 19B, the influence on the intermediate visual field region can be reduced. Furthermore, since the required addition can be given to each of the outer surface 19A and the inner surface 19B, the more stable progressive addition lens 10 that controls the addition power for the intermediate distance required for the intermediate visual field region on one side can be provided. Can be manufactured.

このように、外面１９Ａに第１の累進面１８Ａを設け、内面１９Ｂに第２の累進面１８Ｂを設けた両面設計を行うことで、中間視野領域の物体倍率を内面累進設計よりも大きくした累進屈折力レンズを提供できる。物体倍率が大きくなることで、中間、近用距離の物体を大きく見せ、中間、近距離の物体を視やすくすることができる。   In this way, by carrying out a double-sided design in which the first progressive surface 18A is provided on the outer surface 19A and the second progressive surface 18B is provided on the inner surface 19B, the intermediate magnification is made larger in object magnification than the inner surface progressive design. A refractive lens can be provided. By increasing the object magnification, it is possible to make the intermediate and near-distance objects appear larger and make it easier to see the intermediate and short-distance objects.

さらに、内面１９Ｂにおける累進部（第２の累進面）１８Ｂの位置を上下に移動させ、外面１９Ａの累進部（第１の累進面）１８Ａとのズレ量のコントロールが容易であり、中間視野領域の広さを装用者に合わせた設計が容易に行える累進屈折力レンズ１０を提供できる。   Further, the position of the progressive portion (second progressive surface) 18B on the inner surface 19B is moved up and down to easily control the amount of deviation from the progressive portion (first progressive surface) 18A of the outer surface 19A, and the intermediate visual field region It is possible to provide a progressive power lens 10 that can be easily designed in accordance with the size of the wearer.

すなわち、累進屈折力レンズの倍率Ｍは近似的に以下の式で表わされる。
Ｍ＝Ｍｓ×Ｍｐ・・・（９）
ここで、Ｍｓはシェープ・ファクター、Ｍｐはパワー・ファクターと呼ばれる。レンズ基材の屈折率をｎ、レンズの物体側の面のベースカーブ（面屈折力）をＤ（ディオプトリ）、レンズの眼球側の面の頂点（内側頂点）から眼球までの距離をＬ、内側頂点の屈折力（内側頂点屈折力）をＰ（度数Ｓ）、レンズ中心の厚みをｔとすると、ＭｐおよびＭｓは、以下のように表される。
Ｍｓ＝１／（１−Ｄ×ｔ／ｎ）・・・（１０）
Ｍｐ＝１／（１−Ｌ×Ｐ）・・・・・（１１） That is, the magnification M of the progressive power lens is approximately expressed by the following equation.
M = Ms × Mp (9)
Here, Ms is called a shape factor, and Mp is called a power factor. The refractive index of the lens substrate is n, the base curve (surface refractive power) of the object side surface of the lens is D (diopter), the distance from the apex (inner apex) of the lens eyeball side surface to the eyeball is L, the inner side When the refractive power at the apex (inner apex refractive power) is P (frequency S) and the thickness of the lens center is t, Mp and Ms are expressed as follows.
Ms = 1 / (1-D × t / n) (10)
Mp = 1 / (1-L × P) (11)

なお、式（１０）および（１１）の計算にあたっては、ベースカーブＤおよび内側頂点屈折力Ｐについてはディオプトリ（Ｄ）を、また、厚みｔおよび距離Ｌについてはメートル（ｍ）を用いる。   In calculating the expressions (10) and (11), diopter (D) is used for the base curve D and the inner vertex power P, and meters (m) are used for the thickness t and the distance L.

したがって、式（９）は、以下のようになる。
Ｍ＝{１／（１−Ｄ×ｔ／ｎ）}×{１／（１−Ｌ×Ｐ）}・・・（１２）
この式（１２）からわかるように、屈折力Ｐが大きくなると倍率Ｍも大きくなり、遠用部１１に対して中間部１３および近用部１２の方が像の倍率Ｍが大きくなる。したがって、外面１９Ａに第１の累進面１８Ａを設け、内面１９Ｂに第２の累進面１８Ｂを設けた両面設計を行うことで、中間視野領域、特に、第３の領域１３３の物体倍率Ｍの変化を内面累進設計よりも小さくした累進屈折力レンズを提供できる。 Therefore, Formula (9) becomes as follows.
M = {1 / (1-D × t / n)} × {1 / (1-L × P)} (12)
As can be seen from the equation (12), as the refractive power P increases, the magnification M also increases, and the intermediate portion 13 and the near portion 12 have a larger image magnification M than the distance portion 11. Accordingly, by performing a double-sided design in which the first progressive surface 18A is provided on the outer surface 19A and the second progressive surface 18B is provided on the inner surface 19B, the change of the object magnification M in the intermediate visual field region, particularly the third region 133 It is possible to provide a progressive-power lens that is smaller than the inner surface progressive design.

（実施例２）
図７に、実施例２の累進屈折力レンズ１０の物体側の面（外面）１９Ａの主注視線１４に沿った面屈折力ＯＰの変化と、眼球側の面（内面）１９Ｂの主注視線１４に沿った面屈折力ＩＰの変化と、外面１９Ａおよび内面１９Ｂの面屈折力により得られる目視度数（平均度数）ＡＰの変化とを模式的に示している。 (Example 2)
FIG. 7 shows changes in the surface refractive power OP along the main gaze line 14 of the object side surface (outer surface) 19A of the progressive-power lens 10 of Example 2, and the main gaze line of the eyeball side surface (inner surface) 19B. 14 schematically shows a change in the surface refractive power IP along 14 and a change in the visual power (average power) AP obtained by the surface refractive power of the outer surface 19A and the inner surface 19B.

実施例２の累進屈折力レンズ１０は、累進帯長が２４ｍｍ、処方度数（遠用度数、Ｓｐｈ）が０．００（Ｄ）、加入度数（Ａｄｄ）が２．００（Ｄ）という条件で設計したものである。なお、レンズ１０の直径は６５ｍｍであり、乱視度数は含まれていない。   The progressive-power lens 10 of Example 2 is designed on the condition that the progressive zone length is 24 mm, the prescription power (distance power, Sph) is 0.00 (D), and the addition power (Add) is 2.00 (D). It is a thing. The lens 10 has a diameter of 65 mm and does not include astigmatism power.

実施例２の累進屈折力レンズの内面１９Ｂは、遠用部１１の面屈折力ＩＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰの上１０ｍｍから始まり、フィッティングポイントＦＰで終了しており、面屈折力ＩＰの変化分ΔＩＰは−０．７５（Ｄ）である。すなわち、内面１９Ｂは、面屈折力ＩＰが変化する第２の累進面１８Ｂを含み、第２の累進面１８Ｂの開始座標Ｐ３は遠用部１１と中間部１３との境界ＰＦであり、終了座標Ｐ４はフィッティングポイントＦＰとなっており、面屈折力ＩＰによる度数変化ＤＩＰ（絶対値）は０．０７５（Ｄ／ｍｍ）である。   The inner surface 19B of the progressive-power lens of Example 2 has a surface refractive power IP of 4.00 (D) for the distance portion 11, and the progressive zone length starts from 10 mm above the fitting point FP and ends at the fitting point FP. The change ΔIP in the surface refractive power IP is −0.75 (D). That is, the inner surface 19B includes the second progressive surface 18B in which the surface refractive power IP changes, the start coordinate P3 of the second progressive surface 18B is the boundary PF between the distance portion 11 and the intermediate portion 13, and the end coordinate. P4 is a fitting point FP, and the power change DIP (absolute value) due to the surface refractive power IP is 0.075 (D / mm).

一方、外面１９Ａは、遠用部１１の面屈折力ＯＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰの４ｍｍ下から始まり、フィッティングポイントＦＰの１４ｍｍ下で終わり、面屈折力ＯＰの変化分ΔＯＰは１．２５（Ｄ）である。すなわち、外面１９Ａは、面屈折力ＯＰが変化する第１の累進面１８Ａを含み、第１の累進面１８Ａの開始座標Ｐ１はフィッティングポイントＦＰの下側４ｍｍであり、終了座標Ｐ２は中間部１３と近用部１２との境界ＰＮとなっており、面屈折力ＯＰによる度数変化ＤＯＰは０．０８９（Ｄ／ｍｍ）である。   On the other hand, the outer surface 19A has a surface refractive power OP of 4.00 (D) of the distance portion 11 and a progressive zone length starting from 4 mm below the fitting point FP and ending at 14 mm below the fitting point FP. The change ΔOP of is 1.25 (D). That is, the outer surface 19A includes the first progressive surface 18A in which the surface refractive power OP changes, the start coordinate P1 of the first progressive surface 18A is 4 mm below the fitting point FP, and the end coordinate P2 is the intermediate portion 13. And the near portion 12, and the power change DOP due to the surface refractive power OP is 0.089 (D / mm).

したがって、第１の累進面１８Ａの座標Ｐ１は座標Ｐ２よりも大きく、第２の累進面１８Ｂの座標Ｐ３は座標Ｐ４よりも大きく、さらに、座標Ｐ４は座標Ｐ１よりも大きい。したがって、座標Ｐ１、Ｐ２、Ｐ３およびＰ４は、上記条件（２）、（３）および（５）を満足する。   Therefore, the coordinate P1 of the first progressive surface 18A is larger than the coordinate P2, the coordinate P3 of the second progressive surface 18B is larger than the coordinate P4, and the coordinate P4 is larger than the coordinate P1. Therefore, the coordinates P1, P2, P3 and P4 satisfy the above conditions (2), (3) and (5).

累進屈折力レンズ１０の外面１９Ａおよび内面１９Ｂにより得られる目視度数ＡＰは、図７に示すように、実施例１の累進屈折力レンズ１０の目視度数ＡＰと近似的には同一である。したがって、第３の目視度数勾配Ｄ３は、第１の目視度数勾配Ｄ１および第２の目視度数勾配Ｄ２の最小値より小さく、第１の目視度数勾配Ｄ１、第２の目視度数勾配Ｄ２および第３の目視度数勾配Ｄ３は上記条件（１）を満たす。   The visual power AP obtained by the outer surface 19A and the inner surface 19B of the progressive-power lens 10 is approximately the same as the visual power AP of the progressive-power lens 10 of Example 1, as shown in FIG. Accordingly, the third visual power gradient D3 is smaller than the minimum value of the first visual power gradient D1 and the second visual power gradient D2, and the first visual power gradient D1, the second visual power gradient D2, and the third visual power gradient D2. The visual power gradient D3 satisfies the above condition (1).

実施例２の累進屈折力レンズ１０も、実施例１の累進屈折力レンズ１０と同様に、外面（物体側の面）１９Ａと内面（眼球側の面）１９Ｂとが主注視線１４に沿った異なる範囲に面屈折力が変化する累進面、すなわち、第１の累進面１８Ａおよび第２の累進面１８Ｂとを含む。さらに、外面（物体側の面）１９Ａと内面（眼球側の面）１９Ｂとは、主注視線１４に沿った異なる位置に同傾向の目視度数勾配を付与するように面屈折力が変化する累進面、すなわち、第１の累進面１８Ａおよび第２の累進面１８Ｂを含む。そして、相互に重複しない累進面１８Ａおよび１８Ｂにより、中間部１３の第１の領域１３１、第２の領域１３２および第３の領域１３３が形成され、目視度数勾配の少ない第３の領域１３３を中間部１３に含む累進屈折力レンズ１０を提供できる。   Similarly to the progressive-power lens 10 of Example 1, the progressive-power lens 10 of Example 2 also has an outer surface (object side surface) 19A and an inner surface (eyeball side surface) 19B along the main line of sight 14. It includes a progressive surface whose surface refractive power varies in different ranges, that is, a first progressive surface 18A and a second progressive surface 18B. Further, the outer surface (object side surface) 19A and the inner surface (eyeball side surface) 19B are progressively changed in surface refractive power so as to give the same visual power gradient to different positions along the main gazing line 14. A plane, ie, a first progressive surface 18A and a second progressive surface 18B are included. Then, the first area 131, the second area 132, and the third area 133 of the intermediate portion 13 are formed by the progressive surfaces 18A and 18B that do not overlap with each other, and the third area 133 with a small visual power gradient is intermediate. The progressive power lens 10 included in the portion 13 can be provided.

（実施例３）
図８に、実施例３の累進屈折力レンズ１０の物体側の面（外面）１９Ａの主注視線１４に沿った面屈折力ＯＰの変化と、眼球側の面（内面）１９Ｂの主注視線１４に沿った面屈折力ＩＰの変化と、外面１９Ａおよび内面１９Ｂの面屈折力により得られる目視度数（平均度数）ＡＰの変化とを模式的に示している。 (Example 3)
FIG. 8 shows changes in the surface refractive power OP along the main gaze line 14 of the object-side surface (outer surface) 19A of the progressive-power lens 10 of Example 3, and the main gaze line of the eyeball-side surface (inner surface) 19B. 14 schematically shows a change in the surface refractive power IP along 14 and a change in the visual power (average power) AP obtained by the surface refractive power of the outer surface 19A and the inner surface 19B.

実施例３の累進屈折力レンズ１０は、累進帯長が２４ｍｍ、処方度数（遠用度数、Ｓｐｈ）が０．００（Ｄ）、加入度数（Ａｄｄ）が２．００（Ｄ）という条件で設計したものである。なお、レンズ１０の直径は６５ｍｍであり、乱視度数は含まれていない。   The progressive-power lens 10 of Example 3 is designed under the conditions that the progressive zone length is 24 mm, the prescription power (distance power, Sph) is 0.00 (D), and the addition power (Add) is 2.00 (D). It is a thing. The lens 10 has a diameter of 65 mm and does not include astigmatism power.

実施例３の累進屈折力レンズの内面１９Ｂは、遠用部１１の面屈折力ＩＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰの上１０ｍｍから始まり、フィッティングポイントＦＰの１４ｍｍ下で終わり、面屈折力ＩＰの変化分ΔＩＰは−２．４０（Ｄ）である。すなわち、内面１９Ｂは、面屈折力ＩＰが変化する第２の累進面１８Ｂを含み、第２の累進面１８Ｂの開始座標Ｐ３は遠用部１１と中間部１３との境界ＰＦであり、終了座標Ｐ４は近用部１２と中間部１３との境界ＰＮとなっており、面屈折力ＩＰによる度数変化ＤＩＰ（絶対値）は０．１００（Ｄ／ｍｍ）である。   The inner surface 19B of the progressive-power lens of Example 3 has a surface refractive power IP of 4.00 (D) of the distance portion 11 and a progressive zone length starting from 10 mm above the fitting point FP and 14 mm below the fitting point FP. The change ΔIP of the surface power IP is −2.40 (D). That is, the inner surface 19B includes the second progressive surface 18B in which the surface refractive power IP changes, the start coordinate P3 of the second progressive surface 18B is the boundary PF between the distance portion 11 and the intermediate portion 13, and the end coordinate. P4 is a boundary PN between the near portion 12 and the intermediate portion 13, and the power change DIP (absolute value) due to the surface refractive power IP is 0.100 (D / mm).

一方、外面１９Ａは、遠用部１１の面屈折力ＯＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰから始まり、フィッティングポイントＦＰの４ｍｍ下で終わり、面屈折力ＯＰの変化分ΔＯＰは−０．４（Ｄ）である。すなわち、外面１９Ａは、面屈折力ＯＰが逆傾向に変化する第１の累進面（逆累進面）１８Ａを含み、第１の累進面１８Ａの開始座標Ｐ１はフィッティングポイントＦＰであり、終了座標Ｐ２はフィッティングポイントＦＰの下側４ｍｍであり、面屈折力ＯＰによる度数変化ＤＯＰ（絶対値）は０．１００（Ｄ／ｍｍ）である。   On the other hand, on the outer surface 19A, the distance power 11 of the distance portion 11 is 4.00 (D), the progressive zone length starts from the fitting point FP, ends at 4 mm below the fitting point FP, and the amount of change in the surface refractive power OP. ΔOP is −0.4 (D). That is, the outer surface 19A includes a first progressive surface (reverse progressive surface) 18A in which the surface refractive power OP changes in a reverse tendency, the start coordinate P1 of the first progressive surface 18A is the fitting point FP, and the end coordinate P2 Is 4 mm below the fitting point FP, and the power change DOP (absolute value) due to the surface refractive power OP is 0.100 (D / mm).

したがって、第１の累進面１８Ａの座標Ｐ１は座標Ｐ２よりも大きく、第２の累進面１８Ｂの座標Ｐ３は座標Ｐ４よりも大きく、さらに、第１の累進面１８Ａの開始座標Ｐ１は第２の累進面１８Ｂの開始座標Ｐ３より小さく、第１の累進面１８Ａの終了座標Ｐ２は第２の累進面１８Ｂの終了座標Ｐ４よりも大きい。したがって、座標Ｐ１、Ｐ２、Ｐ３およびＰ４は、上記条件（２）、（３）および（７）を満足する。   Therefore, the coordinate P1 of the first progressive surface 18A is larger than the coordinate P2, the coordinate P3 of the second progressive surface 18B is larger than the coordinate P4, and the start coordinate P1 of the first progressive surface 18A is the second coordinate. It is smaller than the start coordinate P3 of the progressive surface 18B, and the end coordinate P2 of the first progressive surface 18A is larger than the end coordinate P4 of the second progressive surface 18B. Therefore, the coordinates P1, P2, P3 and P4 satisfy the above conditions (2), (3) and (7).

累進屈折力レンズ１０の外面１９Ａおよび内面１９Ｂにより得られる目視度数ＡＰは、図８に示すように、実施例１の累進屈折力レンズ１０の目視度数ＡＰとほぼ同一であり、第３の領域１３３の目視度数は近似的に１．００（Ｄ）で一定となる。したがって、第３の目視度数勾配Ｄ３は、第１の目視度数勾配Ｄ１および第２の目視度数勾配Ｄ２の最小値より小さく、第１の目視度数勾配Ｄ１、第２の目視度数勾配Ｄ２および第３の目視度数勾配Ｄ３は上記条件（１）を満たす。   The visual power AP obtained by the outer surface 19A and the inner surface 19B of the progressive-power lens 10 is substantially the same as the visual power AP of the progressive-power lens 10 of Example 1 as shown in FIG. The visual power of is approximately constant at 1.00 (D). Accordingly, the third visual power gradient D3 is smaller than the minimum value of the first visual power gradient D1 and the second visual power gradient D2, and the first visual power gradient D1, the second visual power gradient D2, and the third visual power gradient D2. The visual power gradient D3 satisfies the above condition (1).

実施例３の累進屈折力レンズ１０も、実施例１の累進屈折力レンズ１０と同様に、外面（物体側の面）１９Ａと内面（眼球側の面）１９Ｂとが主注視線１４に沿った異なる範囲に面屈折力が変化する累進面、すなわち、第１の累進面１８Ａおよび第２の累進面１８Ｂとを含む。さらに、外面（物体側の面）１９Ａと内面（眼球側の面）１９Ｂとは、さらに、主注視線１４に沿った重複する位置に逆傾向の目視度数勾配を付与するように面屈折力が変化する累進面、すなわち、第１の累進面１８Ａおよび第２の累進面１８Ｂを含む。そして、一部が重複する累進面１８Ａおよび１８Ｂにより、中間部１３の第１の領域１３１、第２の領域１３２および第３の領域１３３が形成され、目視度数勾配の少ない第３の領域１３３を中間部１３に含む累進屈折力レンズ１０を提供できる。   Similarly to the progressive-power lens 10 of Example 1, the progressive-power lens 10 of Example 3 also has an outer surface (object side surface) 19A and an inner surface (eyeball side surface) 19B along the main line of sight 14. It includes a progressive surface whose surface refractive power varies in different ranges, that is, a first progressive surface 18A and a second progressive surface 18B. Further, the outer surface (object-side surface) 19A and the inner surface (eyeball-side surface) 19B further have surface refractive power so as to give a reverse power gradient to the overlapping position along the main line of sight 14. It includes a progressive surface that changes, that is, a first progressive surface 18A and a second progressive surface 18B. Then, the first surface 131, the second region 132, and the third region 133 of the intermediate portion 13 are formed by the progressive surfaces 18A and 18B that are partially overlapped, and the third region 133 with a small visual power gradient is formed. The progressive addition lens 10 included in the intermediate portion 13 can be provided.

さらに、この実施例３の累進屈折力レンズ１０においては、外面１９Ａに逆累進面１８Ａが形成され、面屈折力（ベースカーブ）ＯＰは近用部１２の方が遠用部１１より小さくなっている。このため、先に式（１２）に示したように、屈折力Ｐが大きくなると倍率Ｍも大きくなり、遠用部１１に対して中間部１３および近用部１２の方が像の倍率Ｍが大きくなるが、外面１９Ａの面屈折力ＯＰが小さくなるので遠用部１１、中間部１３および近用部１２の像の倍率差を小さくできる。   Further, in the progressive addition lens 10 of the third embodiment, the reverse progressive surface 18A is formed on the outer surface 19A, and the surface refractive power (base curve) OP is smaller in the near portion 12 than in the distance portion 11. Yes. Therefore, as shown in the equation (12), when the refractive power P is increased, the magnification M is also increased, and the intermediate portion 13 and the near portion 12 have an image magnification M greater than that of the distance portion 11. However, since the surface refractive power OP of the outer surface 19A is reduced, the magnification difference between the images of the distance portion 11, the intermediate portion 13, and the near portion 12 can be reduced.

（実施例４）
図９に、実施例４の累進屈折力レンズ１０の物体側の面（外面）１９Ａの主注視線１４に沿った面屈折力ＯＰの変化と、眼球側の面（内面）１９Ｂの主注視線１４に沿った面屈折力ＩＰの変化と、外面１９Ａおよび内面１９Ｂの面屈折力により得られる目視度数（平均度数）ＡＰの変化とを模式的に示している。 Example 4
FIG. 9 shows changes in the surface refractive power OP along the main gaze line 14 of the object side surface (outer surface) 19A of the progressive-power lens 10 of Example 4, and the main gaze line of the eyeball side surface (inner surface) 19B. 14 schematically shows a change in the surface refractive power IP along 14 and a change in the visual power (average power) AP obtained by the surface refractive power of the outer surface 19A and the inner surface 19B.

実施例４の累進屈折力レンズ１０は、累進帯長が２４ｍｍ、処方度数（遠用度数、Ｓｐｈ）が０．００（Ｄ）、加入度数（Ａｄｄ）が２．００（Ｄ）という条件で設計したものである。なお、レンズ１０の直径は６５ｍｍであり、乱視度数は含まれていない。   The progressive-power lens 10 of Example 4 is designed on the condition that the progressive zone length is 24 mm, the prescription power (distance power, Sph) is 0.00 (D), and the addition power (Add) is 2.00 (D). It is a thing. The lens 10 has a diameter of 65 mm and does not include astigmatism power.

実施例４の累進屈折力レンズの外面１９Ａは、遠用部１１の面屈折力ＩＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰの上１０ｍｍから始まり、フィッティングポイントＦＰの１４ｍｍ下で終わり、面屈折力ＯＰの変化分ΔＯＰは２．４０（Ｄ）である。すなわち、外面１９Ａは、面屈折力ＯＰが変化する第１の累進面１８Ａを含み、第１の累進面１８Ａの開始座標Ｐ１は遠用部１１と中間部１３との境界ＰＦであり、終了座標Ｐ２は近用部１２と中間部１３との境界ＰＮとなっており、面屈折力ＯＰによる度数変化ＤＯＰは０．１００（Ｄ／ｍｍ）である。   As for the outer surface 19A of the progressive-power lens of Example 4, the surface refractive power IP of the distance portion 11 is 4.00 (D), the progressive zone length starts from 10 mm above the fitting point FP, and 14 mm below the fitting point FP. The change ΔOP of the surface power OP is 2.40 (D). That is, the outer surface 19A includes the first progressive surface 18A in which the surface refractive power OP changes, the start coordinate P1 of the first progressive surface 18A is the boundary PF between the distance portion 11 and the intermediate portion 13, and the end coordinate P2 is the boundary PN between the near portion 12 and the intermediate portion 13, and the power change DOP due to the surface refractive power OP is 0.100 (D / mm).

一方、内面１９Ｂは、遠用部１１の面屈折力ＩＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰから始まり、フィッティングポイントＦＰの４ｍｍ下で終わり、面屈折力ＩＰの変化分ΔＩＰは０．４（Ｄ）である。すなわち、内面１９Ｂは、面屈折力ＩＰが逆傾向に変化する第２の累進面（逆累進面）１８Ｂを含み、第２の累進面１８Ｂの開始座標Ｐ３はフィッティングポイントＦＰであり、終了座標Ｐ４はフィッティングポイントＦＰの下側４ｍｍであり、面屈折力ＩＰによる度数変化ＤＩＰは０．１００（Ｄ／ｍｍ）である。   On the other hand, the inner surface 19B has a surface refractive power IP of 4.00 (D) for the distance portion 11 and a progressive zone length starting from the fitting point FP and ending at 4 mm below the fitting point FP. ΔIP is 0.4 (D). That is, the inner surface 19B includes a second progressive surface (reverse progressive surface) 18B in which the surface refractive power IP changes in a reverse tendency, the start coordinate P3 of the second progressive surface 18B is the fitting point FP, and the end coordinate P4. Is 4 mm below the fitting point FP, and the power change DIP due to the surface refractive power IP is 0.100 (D / mm).

したがって、第１の累進面１８Ａの座標Ｐ１は座標Ｐ２よりも大きく、第２の累進面１８Ｂの座標Ｐ３は座標Ｐ４よりも大きく、さらに、第１の累進面１８Ａの開始座標Ｐ１は第２の累進面１８Ｂの開始座標Ｐ３より大きく、第１の累進面１８Ａの終了座標Ｐ２は第２の累進面１８Ｂの終了座標Ｐ４よりも小さい。したがって、座標Ｐ１、Ｐ２、Ｐ３およびＰ４は、上記条件（２）、（３）および（８）を満足する。   Therefore, the coordinate P1 of the first progressive surface 18A is larger than the coordinate P2, the coordinate P3 of the second progressive surface 18B is larger than the coordinate P4, and the start coordinate P1 of the first progressive surface 18A is the second coordinate. It is larger than the start coordinate P3 of the progressive surface 18B, and the end coordinate P2 of the first progressive surface 18A is smaller than the end coordinate P4 of the second progressive surface 18B. Therefore, the coordinates P1, P2, P3 and P4 satisfy the above conditions (2), (3) and (8).

累進屈折力レンズ１０の外面１９Ａおよび内面１９Ｂにより得られる目視度数ＡＰは、図９に示すように、実施例１の累進屈折力レンズ１０の目視度数ＡＰとほぼ同一であり、第３の領域１３３の目視度数は近似的に１．００（Ｄ）で一定となる。したがって、第３の目視度数勾配Ｄ３は、第１の目視度数勾配Ｄ１および第２の目視度数勾配Ｄ２の最小値より小さく、第１の目視度数勾配Ｄ１、第２の目視度数勾配Ｄ２および第３の目視度数勾配Ｄ３は上記条件（１）を満たす。   The visual power AP obtained by the outer surface 19A and the inner surface 19B of the progressive-power lens 10 is substantially the same as the visual power AP of the progressive-power lens 10 of Example 1, as shown in FIG. The visual power of is approximately constant at 1.00 (D). Accordingly, the third visual power gradient D3 is smaller than the minimum value of the first visual power gradient D1 and the second visual power gradient D2, and the first visual power gradient D1, the second visual power gradient D2, and the third visual power gradient D2. The visual power gradient D3 satisfies the above condition (1).

（実施例５）
図１０に、実施例５の累進屈折力レンズ１０の物体側の面（外面）１９Ａの主注視線１４に沿った面屈折力ＯＰの変化と、眼球側の面（内面）１９Ｂの主注視線１４に沿った面屈折力ＩＰの変化と、外面１９Ａおよび内面１９Ｂの面屈折力により得られる目視度数（平均度数）ＡＰの変化とを模式的に示している。 (Example 5)
FIG. 10 shows changes in the surface refractive power OP along the main gaze line 14 of the object-side surface (outer surface) 19A of the progressive-power lens 10 of Example 5, and the main gaze line of the eyeball-side surface (inner surface) 19B. 14 schematically shows a change in the surface refractive power IP along 14 and a change in the visual power (average power) AP obtained by the surface refractive power of the outer surface 19A and the inner surface 19B.

実施例５の累進屈折力レンズ１０は、累進帯長が２４ｍｍ、処方度数（遠用度数、Ｓｐｈ）が０．００（Ｄ）、加入度数（Ａｄｄ）が２．００（Ｄ）という条件で設計したものである。なお、レンズ１０の直径は６５ｍｍであり、乱視度数は含まれていない。   The progressive-power lens 10 of Example 5 is designed on the condition that the progressive zone length is 24 mm, the prescription power (distance power, Sph) is 0.00 (D), and the addition power (Add) is 2.00 (D). It is a thing. The lens 10 has a diameter of 65 mm and does not include astigmatism power.

実施例５の累進屈折力レンズの外面１９Ａは面屈折力ＯＰが４．００（Ｄ）の球面である。一方、内面１９Ｂは、遠用部１１の面屈折力ＩＰが４．００（Ｄ）で、累進帯長がフィッティングポイントＦＰの上１０ｍｍから始まり、フィッティングポイントＦＰで終わる累進面１７Ａと、フィッティングポイントＦＰの４ｍｍ下から始まりフィッティングポイントＦＰの１４ｍｍ下で終わる累進面１７Ｂとを含む。累進面１７Ａの面屈折力ＩＰの変化分ΔＩＰは−０．７５（Ｄ）であり、累進面１７Ｂの面屈折力ＩＰの変化分ΔＩＰは−１．２５（Ｄ）であり、累進面１７Ａと累進面１７Ｂとの間の面屈折力ＩＰは変化せず３．２５（Ｄ）で一定である。   The outer surface 19A of the progressive-power lens of Example 5 is a spherical surface having a surface refractive power OP of 4.00 (D). On the other hand, the inner surface 19B has a progressive surface 17A having a surface refractive power IP of 4.00 (D) of the distance portion 11 and a progressive zone length starting from 10 mm above the fitting point FP and ending at the fitting point FP, and the fitting point FP. And a progressive surface 17B starting from 4 mm below and ending 14 mm below the fitting point FP. The change ΔIP of the surface refractive power IP of the progressive surface 17A is −0.75 (D), and the change ΔIP of the surface refractive power IP of the progressive surface 17B is −1.25 (D). The surface refractive power IP between the progressive surface 17B does not change and is constant at 3.25 (D).

したがって、累進屈折力レンズ１０の外面１９Ａおよび内面１９Ｂにより得られる目視度数ＡＰは、図１０に示すように、実施例１の累進屈折力レンズ１０の目視度数ＡＰとほぼ同一であり、第３の目視度数勾配Ｄ３は、第１の目視度数勾配Ｄ１および第２の目視度数勾配Ｄ２の最小値より小さく、第１の目視度数勾配Ｄ１、第２の目視度数勾配Ｄ２および第３の目視度数勾配Ｄ３は上記条件（１）を満たす。   Therefore, the visual power AP obtained by the outer surface 19A and the inner surface 19B of the progressive-power lens 10 is substantially the same as the visual power AP of the progressive-power lens 10 of Example 1, as shown in FIG. The visual power gradient D3 is smaller than the minimum value of the first visual power gradient D1 and the second visual power gradient D2, and the first visual power gradient D1, the second visual power gradient D2, and the third visual power gradient D3. Satisfies the above condition (1).

図１１に、累進屈折力レンズ１０を設計および製造する過程を示している。ステップ１０１において、眼鏡仕様に基づいて外面（物体側の面）１９Ａおよび内面（眼球側の面）１９Ｂを設計する。この際、中間部１３が第１の領域１３１、第２の領域１３２および第３の領域１３３を含み、第１の領域１３１の第１の目視度数勾配Ｄ１、第２の領域１３２の第２の目視度数勾配Ｄ２、および第３の領域１３３の第３の目視度数勾配Ｄ３が上記条件（１）を満たすように外面１９Ａおよび内面１９Ｂを設計する。   FIG. 11 shows a process of designing and manufacturing the progressive addition lens 10. In step 101, an outer surface (object side surface) 19A and an inner surface (eyeball side surface) 19B are designed based on spectacles specifications. At this time, the intermediate portion 13 includes the first region 131, the second region 132, and the third region 133, the first visual power gradient G1 of the first region 131, and the second region 132 of the second region 132. The outer surface 19A and the inner surface 19B are designed so that the visual power gradient D2 and the third visual power gradient D3 of the third region 133 satisfy the above condition (1).

典型的には、外面１９Ａを設計するステップ１０２において、中間部１３が第１の累進面１８Ａを含むように設計し、内面１９Ｂを設計するステップ１０３において、中間部が第２の累進面１８Ｂを含むように設計する。第１の累進面１８Ａおよび第２の累進面１８Ｂの主注視線１４に沿った各座標Ｐ１〜Ｐ４が上記条件（２）および（３）を満たす場合、ステップ１０２および１０３においては、各座標Ｐ１〜Ｐ４が上記条件（４）〜（７）のいずれかを満たすように、第１の累進面１８Ａを含む外面１９Ａと、第２の累進面１８Ｂを含む内面１９Ｂとを設計する。   Typically, in step 102 of designing the outer surface 19A, the intermediate portion 13 is designed to include the first progressive surface 18A, and in step 103 of designing the inner surface 19B, the intermediate portion defines the second progressive surface 18B. Design to include. When the coordinates P1 to P4 along the main gazing line 14 of the first progressive surface 18A and the second progressive surface 18B satisfy the above conditions (2) and (3), in steps 102 and 103, the coordinates P1 The outer surface 19A including the first progressive surface 18A and the inner surface 19B including the second progressive surface 18B are designed so that .about.P4 satisfies any of the above conditions (4) to (7).

次に、ステップ１０４において、上記にて設計された内外面を有する眼鏡用の累進屈折力レンズ１０を製造する。   Next, in step 104, the progressive-power lens 10 for spectacles having the inner and outer surfaces designed as described above is manufactured.

以上に説明した累進屈折力レンズ１０は、中間部１３に目視度数変化が中間部１３の他の領域より小さい第３の領域１３３を含む。現在、中間距離で行う作業が増えている。例えば、ＰＣディスプレイまでの距離が６０ｃｍ〜８０ｃｍ、中型および大型ＴＶの視聴距離が１．０ｍ〜２．０ｍであることを考えると、累進屈折力レンズ１０の中間部１３の使用頻度が増えている。したがって、目視度数変化の少ない（小さい）第３の領域１３３を中間視野領域として中間部１３に設定し、使用頻度の高い中間距離に対応して、中間視野領域の加入度数を決めた累進屈折力レンズ１０を設計および製造することにより、中間距離の使用頻度が高いユーザーに適した累進屈折力レンズ１０を設計し、提供できる。   The progressive-power lens 10 described above includes a third region 133 in the intermediate portion 13 whose visual power change is smaller than other regions of the intermediate portion 13. Currently, more work is performed at intermediate distances. For example, considering that the distance to the PC display is 60 cm to 80 cm and the viewing distance of medium-sized and large-sized TVs is 1.0 m to 2.0 m, the frequency of use of the intermediate portion 13 of the progressive addition lens 10 is increasing. . Therefore, the third region 133 having a small (small) visual power change is set as the intermediate visual field region in the intermediate portion 13, and the progressive addition power in which the addition power of the intermediate visual field region is determined corresponding to the frequently used intermediate distance. By designing and manufacturing the lens 10, it is possible to design and provide a progressive power lens 10 suitable for users who frequently use intermediate distances.

特に、上記に示したように外面１９Ａおよび内面１９Ｂにそれぞれ累進面１８Ａおよび１８Ｂを設ける両面設計を採用することにより、中間視野領域の加入度数を容易に設定できる。また、フィッティングポイントＦＰよりも上側に一方の面の累進帯（累進面）を設けることにより、中間視野領域の加入度をさらにフレキシブルに設定できる。   In particular, by employing a double-sided design in which progressive surfaces 18A and 18B are provided on the outer surface 19A and the inner surface 19B as described above, the addition power of the intermediate visual field region can be easily set. Further, by providing a progressive zone (progressive surface) on one surface above the fitting point FP, the addition power of the intermediate visual field region can be set more flexibly.

なお、上記において例示した外面１９Ａおよび内面１９Ｂの設計は一例に過ぎず、特許請求の範囲に記載された範囲内において眼鏡仕様に基づき様々な形状の曲面を採用してもよい。   The design of the outer surface 19A and the inner surface 19B exemplified above is merely an example, and curved surfaces having various shapes may be adopted based on spectacles specifications within the scope described in the claims.

１ 眼鏡、 １０、１０Ｌ、１０Ｒ 眼鏡用レンズ
１１ 遠用部、 １２ 近用部、 １３ 中間部（累進部）
１９Ａ 物体側の面、 １９Ｂ 眼球側の面
２０ フレーム DESCRIPTION OF SYMBOLS 1 Glasses, 10, 10L, 10R Glasses lens 11 Distance part, 12 Near part, 13 Middle part (progressive part)
19A Object side surface, 19B Eyeball side surface 20 Frame

Claims (9)

目視度数の異なる遠用部および近用部と、前記遠用部および前記近用部の間に位置する中間部とを有する眼鏡用の累進屈折力レンズであって、
前記中間部が、前記遠用部に繋がり、第１の目視度数勾配Ｄ１を備えた第１の領域と、
前記近用部に繋がり、第２の目視度数勾配Ｄ２を備えた第２の領域と、
前記第１の領域および前記第２の領域の間に位置する第３の領域であって、第３の目視度数勾配Ｄ３を備えた第３の領域とを含み、前記第１の目視度数勾配Ｄ１、前記第２の目視度数勾配Ｄ２および前記第３の目視度数勾配Ｄ３は以下の条件を満たすとともに、前記第３の領域はフィッティングポイントを含み、前記中間部の物体側の面は、主注視線に沿った座標Ｐ１から座標Ｐ２の間で面屈折力が変化する第１の累進面を含み、前記中間部の眼球側の面は前記主注視線に沿った座標Ｐ３から座標Ｐ４の間で面屈折力が変化する第２の累進面を含み、前記座標Ｐ１、Ｐ２、Ｐ３およびＰ４はそれぞれ異なり、以下の条件を満たす、累進屈折力レンズ。
｜Ｄ３｜＜ＭＩＮ（｜Ｄ１｜、｜Ｄ２｜）
ただし、ＭＩＮは最小値を示す関数である。
Ｐ１＞Ｐ２
Ｐ３＞Ｐ４ A progressive-power lens for spectacles having a distance portion and a near portion having different visual powers, and an intermediate portion located between the distance portion and the near portion,
The intermediate portion is connected to the distance portion, the first region having a first visual power gradient D1,
A second region connected to the near portion and having a second visual power gradient D2,
A third region located between the first region and the second region, the third region having a third visual power gradient D3, and the first visual power gradient D1 The second visual power gradient D2 and the third visual power gradient D3 satisfy the following conditions , the third area includes a fitting point, and the object side surface of the intermediate portion has a main gaze line. Including a first progressive surface whose surface refractive power changes between coordinates P1 and P2 along the center, and the eyeball side surface of the intermediate portion is a surface between coordinates P3 and coordinates P4 along the main gaze line. A progressive addition lens including a second progressive surface whose refractive power changes, wherein the coordinates P1, P2, P3 and P4 are different and satisfy the following conditions .
| D3 | <MIN (| D1 |, | D2 |)
However, MIN is a function indicating a minimum value.
P1> P2
P3> P4 請求項１において、前記第１の累進面および前記第２の累進面はそれぞれ目視度数勾配を付与する面であり、前記座標Ｐ１、Ｐ２、Ｐ３およびＰ４は、さらに、以下の条件のいずれかを満たす、累進屈折力レンズ。
Ｐ２＞Ｐ３
Ｐ１＜Ｐ４ According to claim 1, wherein the first progressive surface and the second progressive surface is a surface which imparts a visual power gradient, respectively, the coordinates P1, P2, P3 and P4, further one of the following conditions Satisfactory, progressive addition lens.
P2> P3
P1 <P4 請求項１において、前記第１の累進面および前記第２の累進面はそれぞれ目視度数勾配を付与する面であり、前記座標Ｐ１、Ｐ２、Ｐ３およびＰ４は、さらに、以下の条件のいずれかを満たす、累進屈折力レンズ。
Ｐ１＞Ｐ３かつＰ２＜Ｐ４
Ｐ１＜Ｐ３かつＰ２＞Ｐ４ According to claim 1, wherein the first progressive surface and the second progressive surface is a surface which imparts a visual power gradient, respectively, the coordinates P1, P2, P3 and P4, further one of the following conditions Satisfactory, progressive addition lens.
P1> P3 and P2 <P4
P1 <P3 and P2> P4 請求項３において、前記物体側の面と前記眼球側の面とは主注視線に沿った異なる位置に目視度数勾配を付与するように面屈折力が変化する累進面を含む、累進屈折力レンズ。 According to claim 3, including a progressive surface to surface power as above and the object side surface and the eyeball side surface to impart eye vision power gradient in different positions along the main gazing line changes, progressive power lens. 請求項１ないし４のいずれかに記載の累進屈折力レンズと、
前記累進屈折力レンズが取り付けられた眼鏡フレームとを有する眼鏡。 A progressive-power lens according to any one of claims 1 to 4 ,
Eyeglasses having an eyeglass frame to which the progressive addition lens is attached. 目視度数の異なる遠用部および近用部と、前記遠用部および前記近用部の間に位置する中間部とを有する眼鏡用の累進屈折力レンズの設計方法であって、
前記中間部に、前記遠用部に繋がり、第１の目視度数勾配Ｄ１を備えた第１の領域と、前記近用部に繋がり、第２の目視度数勾配Ｄ２を備えた第２の領域と、前記第１の領域および前記第２の領域の間に位置する第３の領域であって、第３の目視度数勾配Ｄ３を備えた第３の領域とを設けることを有し、
前記第１の目視度数勾配Ｄ１、前記第２の目視度数勾配Ｄ２および前記第３の目視度数勾配Ｄ３は以下の条件を満たすとともに、前記第３の領域はフィッティングポイントを含み、前記中間部の物体側の面は、主注視線に沿った座標Ｐ１から座標Ｐ２の間で面屈折力が変化する第１の累進面を含み、前記中間部の眼球側の面は前記主注視線に沿った座標Ｐ３から座標Ｐ４の間で面屈折力が変化する第２の累進面を含み、前記座標Ｐ１、Ｐ２、Ｐ３およびＰ４はそれぞれ異なり、以下の条件を満たす、累進屈折力レンズの設計方法。
｜Ｄ３｜＜ＭＩＮ（｜Ｄ１｜、｜Ｄ２｜）
ただし、ＭＩＮは最小値を示す関数である。
Ｐ１＞Ｐ２
Ｐ３＞Ｐ４ A design method of a progressive-power lens for spectacles having a distance portion and a near portion having different visual powers, and an intermediate portion located between the distance portion and the near portion,
A first region connected to the distance portion and provided with a first visual power gradient G1, and a second region connected to the near portion and provided with a second visual power gradient D2. A third region located between the first region and the second region, the third region having a third visual power gradient D3,
The first visual power gradient D1, the second visual power gradient D2, and the third visual power gradient D3 satisfy the following conditions , the third region includes a fitting point, and the intermediate object The side surface includes a first progressive surface whose surface refractive power changes between coordinates P1 and coordinates P2 along the main gazing line, and the eyeball side surface of the intermediate portion is a coordinate along the main gazing line. A progressive power lens design method including a second progressive surface whose surface refractive power changes between P3 and coordinates P4, wherein the coordinates P1, P2, P3 and P4 are different from each other and satisfy the following conditions .
| D3 | <MIN (| D1 |, | D2 |)
However, MIN is a function indicating a minimum value.
P1> P2
P3> P4 目視度数の異なる遠用部および近用部と、前記遠用部および前記近用部の間に位置する中間部とを有する眼鏡用の累進屈折力レンズの設計方法であって、
物体側の面を設計することと、前記物体側の面を設計することと前後してあるいは同時に眼球側の面を設計することとを有し、
前記物体側の面を設計することは、前記中間部に含まれる第１の累進面であって、主注視線に沿った座標Ｐ１から前記座標Ｐ１より小さい座標Ｐ２の間で面屈折力が変化する第１の累進面を設計することを含み、
前記眼球側の面を設計することは、前記中間部に含まれる第２の累進面であって、前記主注視線に沿った座標Ｐ３から前記座標Ｐ３より小さい座標Ｐ４の間で面屈折力が変化する第２の累進面を設計することを含み、前記座標Ｐ１、Ｐ２、Ｐ３およびＰ４は以下の条件のいずれかを満たす、累進屈折力レンズの設計方法。
Ｐ２＞Ｐ３
Ｐ１＜Ｐ４ A design method of a progressive-power lens for spectacles having a distance portion and a near portion having different visual powers, and an intermediate portion located between the distance portion and the near portion,
Designing an object-side surface; designing the object-side surface; designing an eyeball-side surface before or after;
Designing the object-side surface is a first progressive surface included in the intermediate portion, and the surface refractive power changes between the coordinate P1 along the main line of sight and the coordinate P2 smaller than the coordinate P1. Designing a first progressive surface to
Designing the eyeball-side surface is a second progressive surface included in the intermediate portion, and has a surface refractive power between a coordinate P3 along the main gaze line and a coordinate P4 smaller than the coordinate P3. A design method of a progressive power lens, including designing a second progressive surface that changes, wherein the coordinates P1, P2, P3, and P4 satisfy any of the following conditions.
P2> P3
P1 <P4 目視度数の異なる遠用部および近用部と、前記遠用部および前記近用部の間に位置する中間部とを有する眼鏡用の累進屈折力レンズの設計方法であって、
物体側の面を設計することと、前記物体側の面を設計することと前後してあるいは同時に眼球側の面を設計することとを有し、
前記物体側の面を設計することは、前記中間部に含まれる第１の累進面であって、主注視線に沿った座標Ｐ１から前記座標Ｐ１より小さい座標Ｐ２の間で面屈折力が変化する第１の累進面を設計することを含み、
前記眼球側の面を設計することは、前記中間部に含まれる第２の累進面であって、前記主注視線に沿った座標Ｐ３から前記座標Ｐ３より小さい座標Ｐ４の間で面屈折力が変化する第２の累進面を設計することを含み、前記座標Ｐ１、Ｐ２、Ｐ３およびＰ４は以下の条件のいずれかを満たす、累進屈折力レンズの設計方法。
Ｐ１＞Ｐ３かつＰ２＜Ｐ４
Ｐ１＜Ｐ３かつＰ２＞Ｐ４ A design method of a progressive-power lens for spectacles having a distance portion and a near portion having different visual powers, and an intermediate portion located between the distance portion and the near portion,
Designing an object-side surface; designing the object-side surface; designing an eyeball-side surface before or after;
Designing the object-side surface is a first progressive surface included in the intermediate portion, and the surface refractive power changes between the coordinate P1 along the main line of sight and the coordinate P2 smaller than the coordinate P1. Designing a first progressive surface to
Designing the eyeball-side surface is a second progressive surface included in the intermediate portion, and has a surface refractive power between a coordinate P3 along the main gaze line and a coordinate P4 smaller than the coordinate P3. A design method of a progressive power lens, including designing a second progressive surface that changes, wherein the coordinates P1, P2, P3, and P4 satisfy any of the following conditions.
P1> P3 and P2 <P4
P1 <P3 and P2> P4 請求項６ないし８のいずれかに記載の設計方法により設計された累進屈折力レンズを製造することを含む、累進屈折力レンズの製造方法。 You claim 6 comprises producing the progressive-power lens designed by the design method according to any one of 8, a manufacturing method of the progressive addition lens.
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