JP2004163787A - Manufacture method for progressive refractive lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacture method for a progressive refractive lens for supplying a lens which is adaptive to the characteristic of each customer and in which a suitable free curved surface in accordance with the shape of a frame is molded. <P>SOLUTION: When manufacturing the lens based on the frame shape information of the required frame of spectacles and specific information on the customer wearing the required frame of spectacles, difference in shape between the required frame of spectacles and a reference frame is calculated as a numerical value data, and the reference lens data set in accordance with the shape of the reference frame is corrected in order to suitably mold the specified free curved surface based on the numerical value data and calculated as corrected lens data, whereby the progressive refractive lens suitable for the required frame of spectacles is manufactured based on the corrected lens data. <P>COPYRIGHT: (C)2004,JPO

Description

【００２４】
上記式及びグラフに基づいてより詳しく説明する。グラフにあるように０度位置（鼻側位置）及び１８０度（耳側位置：π）位置ではｚ軸は極大となりそれぞれプラス（盛り上がる方向）・マイナス（窪む方向）の所定の形状が与えられる。また、この位置での合成量は曲線状となっているため曲率の変化が円に沿った方向の曲率の変化として現れることとなる。一方、これらの位置から離れ、π／４≦θ＜３π／４及び５π／４≦θ＜７π／４位置ではグラフから分かるように曲率０の直線状とされるためこの領域においては円に沿った方向の曲率の変化はない。つまり耳側と鼻側の収差は曲率を持って修正されるものの耳側と鼻側から離れると仮想レンズＳＲのレンズ形状データは直線的な変化となる。この式は特に耳側と鼻側を中心に均等に収差バランスを調整したものといえる。この合成面に対応する数値データがその位置における仮想レンズＳＲのレンズ形状データの数値データに反映されて形状の合成がされる。
【００２５】
次に、図１４のフローチャートに基づいて要求フレームＤＦの製造方法について簡単に説明する。工程１において要求フレームＤＦの形状に基づいて仮想レンズＳＲのレンズ形状データと合成するための上記のような合成式を作成する。そして、工程２において合成式に基づいて要求フレームＤＦのレンズを設計する。
次いで、工程３及び工程４によって要求フレームＤＦのレンズを得る。工程３及び工程４については実施の形態１と同様である。
【００２６】
このように構成することによって、本実施の形態２では次のような効果を奏する。
（１）従来とは異なり顧客の選択した要求フレームＤＦ毎に調整した最適の累進屈折力レンズを提供することができることとなる。
（２）顧客固有の情報として累進帯長や瞳孔間距離を考慮して設計できるため個々の顧客のオーダーメイドに近い累進屈折力レンズを製造することができることとなりよりユーザーフレンドリーな商品を提供することが可能となる。
（３）仮想レンズＳＲに基づいて要求フレームＤＦを設計することができるため、設計の手間がかからずオーダーメイドに近いにもかかわらずコストを下げることが可能となる。
【００２７】
尚、この発明は、次のように変更して具体化することも可能である。
・上記では工程１及び工程２はＣＡＭ装置１１によって実行されたが、この工程を他の装置によって実行し、そのデータをＣＡＭ装置１１に入力することでレンズを製造するようにしてもよい。
・上記実施の形態１では累進帯長を固定した上でＡ〜Ｆの設計パターンを用意するようにしていたが、フレーム形状によって累進帯長が変化するように特殊な条件を設定するようにしてもよい。例えば、横長フレームのときは自動的に累進帯を短くして、比較的天地幅が大きいときは累進帯を標準よりも長くするなどである。
・フレーム形状は上記の他の形状であっても構わない。
・実施の形態１の仮想直線Ｌは上記では３２本としたが、これに限定されるものではない。
【００２８】
・実施の形態１では第２の形状データとしては各基準フレームＢＦの分割（細分化）した仮想直線Ｌ１〜３２を要求フレームＤＦの分割（細分化）した仮想直線Ｌ１〜３２の数値と最も近似したものを選択するようにしていたが、複数の仮想直線Ｌ１〜３２を選択し、これらを重み付けして平均をとるようにしても構わない。この場合、すべての基準フレームＢＦの対応する第２の形状データについて重み付けしてもよく、例えば近似率の高いいくつかの（例えば上位３種類のように）第２の形状データを取り出して重み付けしてもよい。
・上記実施の形態１では丸レンズに最適な累進屈折面の加工を施してから要求フレームＤＦに対応した形状にカットするようにしていたが、先にカットしてから最適な累進屈折面の加工を施すようにしてもよい。
・実施の形態１での補正処理は一例であって、他の補正処理方法を採用することも自由である。
・上記実施の形態１では丸レンズに最適な累進屈折面の加工を施してから要求フレームＤＦに対応した形状にカットするようにしていたが、先にカットしてから最適な累進屈折面の加工を施すようにしてもよい。
・実施の形態２での鼻側と耳側の収差分布に任意の非対称性を与える場合に、上記では幾何中心Ｏを中心として反時計回り方向に周回させるようにしていたが、幾何中心Ｏ以外のポイントを中心に設定してもよい。また、周回方向も問わない。
・実施の形態２では上記式で得られる面形状をベースとなるレンズ形状に合成するようにしていたが、上記式で得られる曲率のパラメータとしてベースとなるレンズ形状データを修正するようにしてもよい。
その他本発明の趣旨を逸脱しない態様で実施することは自由である。
【００２９】
上記実施の形態から把握できる本発明のその他の技術的思想について下記に付記として説明する。
（１）
１）前記要求眼鏡フレーム形状を細分化し、各部分について数値データとして第１の形状データを算出する。
２）前記基準フレーム形状を複数用意し、各基準フレーム形状を細分化し各部分について数値データとして第２の形状データを算出する。
３）前記要求眼鏡フレーム形状を細分化した各部分について前記第１の形状データと第２の形状データとを比較し、同第１の形状データと同第２の形状データとの差異に基づいて同各第２の形状データに重み付けをする。
４）前記重み付けをした前記各部分の第２の形状データの同部分毎の前記基準レンズデータを重み付けに応じて算出し、それらの平均値を取って前記要求眼鏡フレーム形状の細分化された各部分について適用して修正レンズデータとする。
１）〜４）によって前記累進屈折力レンズを製造するようにしたことを特徴とする請求項２に記載の累進屈折力レンズの製造方法。
（２）前記細分化された各部分について隣接する同部分同士が滑らかな連続面となるように補正処理を施すようにしたことを特徴とする付記１に記載の累進屈折力レンズの製造方法。
（３）前記顧客の固有情報とは装用時における瞳位置を特定するための所定の位置とレンズの所定の位置との間の位置情報を含むことを特徴とする付記１又は２に記載の累進屈折力レンズの製造方法。
（４）前記顧客の固有情報とは顧客毎に設定される累進帯長情報を含むことを特徴とする付記１〜３のいずれかに記載の累進屈折力レンズの製造方法。
（５） 所定の基準形状フレームと比較した場合に前記要求眼鏡フレームが同基準形状フレームと比較して耳側の面積が大きく、鼻側の面積が小さい特性を有する場合には収差を鼻側に集中させるような修正とすることを特徴とする請求項１〜７若しくは付記１〜４のいずれかに記載の累進屈折力レンズの製造方法。
これは例えば上記のような標準的な逆台形に対して耳側下方の領域が広いナス型のようなケースをいう。
（６） 所定の基準形状フレームと比較した場合に前記要求眼鏡フレームが同基準形状フレームと比較して鼻側の面積が大きく、耳側の面積が小さい特性を有する場合には収差を耳側に集中させるような修正とすることを特徴とする請求項１〜７若しくは付記１〜４に記載の累進屈折力レンズの製造方法。
（７） 前記修正後のレンズデータに基づいて製造される累進屈折力レンズの累進帯長が前記要求フレームに応じた適正範囲の長さではない場合にはその旨の報知を報知手段によって行うようにしたことを特徴とする請求項１〜７若しくは付記１〜６のいずれかに記載の累進屈折力レンズの製造方法。
ここに報知手段とは上記ではモニター１４であるが、その他の手段例えば音声報知等であってもよい。
（８） 前記要求眼鏡フレーム用レンズの累進屈折面の成形加工は表面を球面形状に加工した半製品についてその裏面に施すようにしたことを特徴とする請求項１〜７若しくは付記１〜７のいずれかに記載の累進屈折力レンズの製造方法。
【００３０】
【図面の簡単な説明】
【図１】本発明における情報の流れの概略を説明するフローチャート。
【図２】本発明の実施の形態に使用される材料ブロックの正面図。
【図３】本発明の実施の形態に使用されるＣＡＭ装置の概念図。
【図４】実施の形態１の及び２における累進屈折力レンズの製造工程を説明するフローチャート。
【図５】実施の形態１おけるフレーム形状の特定方法を説明する概念図。
【図６】（ａ）及び（ｂ）は標準型のフレームとそのフレームに最適なレンズ特性を説明する説明図。
【図７】（ａ）及び（ｂ）は横長型のフレームとそのフレームに最適なレンズ特性を説明する説明図。
【図８】ナス型のフレームとそのフレームに最適なレンズ特性を説明する説明図。
【図９】丸型のフレームとそのフレームに最適なレンズ特性を説明する説明図。
【図１０】横型のフレームにおいて耳側が鼻側に比べて広い場合の最適なレンズ特性を説明する説明図。
【図１１】横型のフレームにおいて鼻側が耳側に比べて広い場合の最適なレンズ特性を説明する説明図。
【図１２】実施の形態２における仮想レンズに対する合成面の合成の方法を説明する説明図。
【図１３】実施の形態２における仮想レンズに対する合成面の合成の方法を説明する説明図。
【図１４】実施の形態２おけるフレーム形状の特定方法を説明する概念図。
【符号の説明】
１１…ＣＡＭ装置、ＢＦ…基準フレーム。[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a progressive-power lens used for spectacles for correcting presbyopia.
[0002]
2. Description of the Related Art Conventionally, a spectacle shop orders a lens maker for a lens having a predetermined power and a progressive zone length (hereinafter, referred to as a round lens) according to a customer, and a desired frame of the customer at the shop. The shape is cut in accordance with the shape of the lens. Also, in order to reduce the trouble of the eyeglass store, the eyeglass store informs the lens maker of the frame shape information, and the lens maker cuts it into a lens shape and delivers it to the eyeglass store accordingly. As described above, the advantage of the lens maker cutting the lens into a lens shape is not only a reduction in labor, but also an advantage in that a round lens having a size corresponding to the frame shape can be selected. For example, if a small frame is selected as the frame shape information, the lens maker can adopt a small-diameter round lens and can mold a lens having a relatively thin lens thickness.
[0003]
However, in the case of cutting a lens shape at an eyeglass store, it is only necessary to select a round lens prepared by a lens maker in the first place, and to obtain an optimal progressive refraction according to the frame shape. There is no idea of applying a surface to a lens. Further, even when a lens maker cuts the lens into a lens shape, it does not mean that the lens is designed in accordance with the frame. Although there is room to select a product suitable for the frame shape from the existing product variations, the optimum progressive refraction surface according to the frame shape is not always provided for each lens shape.
The present invention has been made by focusing on the problems existing in such conventional techniques. It is an object of the present invention to provide a method of manufacturing a progressive-power lens that can supply a lens having a free-form surface suitable for a shape of a frame in accordance with the characteristics of each customer.
[0004]
In order to solve the above-mentioned problems, according to the first aspect of the present invention, a distance portion region and a refracting power which is arranged below the distance portion region and has a larger refractive power than the distance portion region. A method for manufacturing a progressive power lens having a near portion area having a progressive power zone disposed between these areas and having a progressively changing refractive power, comprising: frame shape information of a required spectacle frame and the required spectacles The gist is that a free-form surface formed on at least one of the front surface and the back surface of the required eyeglass frame lens is suitably formed based on the unique information of the customer wearing the frame.
[0005]
In the invention of claim 2, in addition to the configuration of the invention of claim 1, in order to suitably form a free-form surface of a lens manufactured corresponding to the required spectacle frame, the required spectacle frame shape and the reference frame shape are combined. The difference of the shape is calculated as numerical data, and the reference lens data set according to the same reference frame shape is corrected to appropriately form a predetermined free-form surface based on the numerical data. The gist of the present invention is to manufacture a progressive power lens suitable for the required spectacle frame based on the corrected lens data.
[0006]
In the invention of claim 3, in addition to the configuration of the invention of claim 2, the required eyeglass frame shape is subdivided, first shape data is calculated as numerical data for each part, and a plurality of the reference frame shapes are prepared. Calculating the second shape data as numerical data for each part by subdividing each reference frame shape, and combining the first shape data and the second shape data for each part obtained by subdividing the required eyeglass frame shape. Comparing, selecting desired second shape data having an approximate difference from the second shape data, and selecting the reference lens data for each of the selected second shape data of each of the portions; The gist is that the progressive spectacle lens is manufactured by applying the modified eyeglass data by applying to each of the subdivided portions of the required eyeglass frame shape. That.
[0007]
Further, in the invention of claim 4, in addition to the configuration of the invention of claim 3, a correction process is performed on each of the subdivided portions so that adjacent adjacent portions become smooth continuous surfaces. And
[0008]
In the invention of claim 5, in addition to the configuration of the invention of claim 1, in order to suitably mold the free-form surface of the lens manufactured corresponding to the required spectacle frame, a predetermined free-form surface is set as a reference. The gist of the invention is that a progressive power lens corresponding to the required spectacle frame is manufactured by synthesizing surface data expressed by a predetermined function with respect to a reference lens surface of the progressive power lens.
In the invention according to claim 6, in addition to the configuration according to any one of claims 1 to 5, the unique information of the customer is between a predetermined position for specifying a pupil position at the time of wearing and a predetermined position of the lens. The point is to include the location information of
According to a seventh aspect of the invention, in addition to any one of the first to sixth aspects of the invention, the gist is that the customer-specific information includes corridor length information set for each customer.
[0009]
With the above configuration, when forming the free-form surface of the lens for the required spectacle frame required by the customer, the lens aberration is corrected based on the frame shape information of the required spectacle frame and the unique information of the customer wearing the same spectacle frame. To do. A typical example of the free-form surface is a progressive refraction surface formed on either the front or back of the lens.
For this purpose, the difference between the required eyeglass frame shape and the reference frame shape is calculated as numerical data, and is set according to the reference frame shape in order to appropriately form a predetermined free-form surface based on the numerical data. It is preferable that the reference lens data is corrected and calculated as corrected lens data, and a progressive power lens corresponding to the required spectacle frame is designed based on the calculated corrected lens data.
As a more specific means, the required eyeglass frame shape is subdivided, first shape data is calculated as numerical data for each portion, and a plurality of the reference frame shapes are prepared. While calculating the second shape data as the numerical data, the first shape data and the second shape data are compared for each of the parts obtained by subdividing the required eyeglass frame shape, and the second shape data is selected from the second shape data. A desired second shape data having an approximate difference is selected, and the reference lens data of each of the selected second shape data of each of the selected portions is divided into the required eyeglass frame shape subdivided. Corrected lens data for manufacturing a progressive-power lens by applying to portions. In this case, it is preferable to perform the correction process on each of the subdivided portions so that the adjacent portions become smooth continuous surfaces.
Further, as another means, in order to suitably shape the free-form surface of the lens of the required spectacle frame, the shape is expressed by a predetermined function with respect to the reference lens surface of the progressive-power lens set to the predetermined free-form surface as a reference. A progressive power lens corresponding to the required spectacle frame may be manufactured by synthesizing surface data.
[0010]
It is preferable that such means include position information between a predetermined position for specifying a pupil position at the time of wearing and a predetermined position of the lens as unique information of the customer. Further, it is preferable that the corridor length information set for each customer is included as the unique information of the customer. In addition, prescription frequency information unique to each customer is included as unique information of the customer.
[0011]
【The invention's effect】
According to the first to seventh aspects of the present invention, it is possible to supply a progressive-power lens corresponding to the characteristics of each customer and forming an optimum free-form surface in accordance with the frame shape.
[0012]
Embodiments of the present invention will be described below with reference to the drawings.
(A) Information flow relating to customer-specific information and frame shape information that is presupposed
As shown in FIG. 1, the spectacle store obtains customer-specific information from a customer who has come to the store to purchase presbyopia-correcting spectacles.
Here, the customer-specific information includes the frequency prescribed for each customer, the distance between pupils of the customer, the length of the corridor, the distance between the lens and the eye when wearing spectacles, and the inclination of the lens with respect to the eye (forward tilt angle). Can be Particularly important information is the power and interpupillary distance.
In particular, information on the length of the progressive zone is important as customer information unique to the progressive power lens. If the length of the corridor zone is relatively long (generally 15 to 18 mm or more), it is inconvenient to have to consciously look down for near vision. On the other hand, if the corridor length is relatively short (generally 13 mm or less), the angle of rotation of the eye downward in near vision is small, so that near vision is easy.
On the other hand, if the length of the progressive zone is set short, the curvature of the lens surface must be changed abruptly, so that aberrations (blurring and distortion) in regions other than the center of the visual field increase. In addition, a sharp change in refractive power accompanies the difficulty in using the progressive-power lens if the user is not accustomed to wearing glasses. In general, a user who is accustomed to wearing a progressive addition lens or a user who has a relatively strong addition (presbyopia has advanced) tends to prefer a lens having a short progressive zone length. On the other hand, a user wearing a progressive-power lens for the first time tends to prefer a lens product having a long progressive zone. The progressive zone length will be determined according to the preference of each customer.
The optician sends the customer-specific information and the frame shape information selected by the customer to the lens manufacturer. The lens maker manufactures a progressive-power lens having an optimal progressive-refractive surface based on the information.
[0013]
(B) Specific manufacturing method
(Embodiment 1)
Embodiment 1 will be described with reference to FIGS.
In the first embodiment, the back side (the upper side in the figure) of a material block 10 as a semi-finished product having a sufficient thickness called a “semi-finish” as shown in FIG. 2 is provided to a CAM (computer aided manufacturing) device 11. Cutting and grinding.
As shown in FIG. 3, the CAM device 11 includes a main control unit 12 and a processing unit 13. The main control unit 12 is provided with a monitor 14, an input unit 15, a central processing unit (CPU) 16 and a memory 17. The memory 17 stores initial data for executing the control program of the CAM device 11 and various programs in advance. Further, new input data input from the input unit 15 and a calculation result by the CPU 16 are temporarily stored. The CPU 16 performs arithmetic processing based on these programs and data in the memory 17. The calculations in Steps 1 and 2 described below are executed by the CPU 16. The processing unit 13 includes an input port 18 for receiving a control signal from the main control unit 12, various actuators 19, and various jigs / tools 20 for actually processing the lens.
The shape data of the material block 10 and the information data of the plurality of reference frames BF have already been input to the memory 17 as initial values.
[0014]
The information data of the plurality of reference frames BF is data used as a base for manufacturing a lens optimal for a frame (hereinafter, referred to as a request frame) DF selected by a customer notified by a lens maker. In the first embodiment, the information data includes frame shape data and lens shape data for shaping a progressive refraction surface optimally set in advance for those shapes.
In the first embodiment, the following types are prepared as frame shape data of the reference frame BF.
A: Most standard inverted trapezoid
B: Inverted triangle with lower part of A
B1 to B3: Variations of B
C: Round shape
C1 to C3: Variations due to differences in diameter
D: Eggplant type with large area below ear side
D1: Variation of D
E: Horizontal type with narrow width
E1: Variation of E
F: elliptical,
F1: Variation of F
These shape data are specified by a direction and a distance from a predetermined position (the distance center P in the present embodiment) to the outer periphery of the frame BF. Specifically, as shown in FIG. 5, virtual straight lines L1 to L32 (32 in the present embodiment) extending radially at equal adjacent angles in all directions of 360 degrees from the distance center P are respectively shown. It is specified by calculating the direction and length.
[0015]
The lens shape data of the reference frame BF is optimally designed in advance for each reference frame BF, and an aberration distribution is made according to the characteristics of the frame. Specifically, in the characteristics of the frame,
1) Relationship between frame area on nose side and ear side from eye
2) Vertical length of frame
Is particularly important.
The positional relationship between the frame and the eyes is a matter of the position of the eyes of the wearer as to whether the area on the nose side or the area on the ear side of the lens is large in the state of being accommodated in the frame. It is preferable to concentrate the aberration on the side having the smaller area in terms of visibility. The importance of the vertical length (top and bottom width) of the frame means that, for example, as shown in FIG. There seems to be a feature that makes it possible.
In the present embodiment, a plurality of optimally designed data having a different positional relationship between the frame and the eye with respect to the lens shape of each reference frame BF are prepared.
In addition, the above-mentioned progressive zone length may be cited as a condition depending on the selection of the customer instead of the feature of the frame. The lens shape data is designed with these conditions in mind.
In the present embodiment, a plurality of optimally designed data having different progressive zone lengths for the lens shape of each reference frame BF are prepared.
[0016]
Several examples are shown for a specific reference frame BF and a round lens in which an optimum progressive refraction surface is set for each reference frame BF. In this embodiment, it is assumed that all the distance powers are S0.00D and C0.00D, and the addition power is 2.00D. The iso-astigmatism curve has 0.50D steps, and each figure is designed with a diameter of 70 mm. In all of these figures, the right side is the nose side.
FIGS. 6A and 6B show the A type in the above. (A) is a type in which the corridor length is short, and is a design in which aberrations are slightly dispersed. (B) is a type having a long progressive zone, and is a design in which aberrations are greatly dispersed.
FIGS. 7A and 7B show the E type in the above. (A) is a type in which the corridor length is short, and is a design in which the near area is set wide. (B) is a type in which the length of the corridor is long, and is a design in which the aberration is concentrated downward and a wide distance portion inside the frame is secured.
FIG. 8 shows the D type in the above. This type has a standard (intermediate) corridor length, and because the ear side is wide, this aberration is dispersed, ensuring a wide distance and near portion. Aberrations are concentrated on the nose side.
FIG. 9 shows the C type in the above. Since this frame has a particularly small diameter, it is necessarily of a type having a short corridor length, and is designed to have a wide near area.
FIGS. 10 and 11 show the case where the horizontal positional relationship between the eye and the frame in the same frame of the E type is considered. FIG. 10 shows a case where the area from the eye to the ear is wider than the area from the eye to the nose. Aberrations are concentrated on the narrower nose. In addition, although they have the same shape, FIG. 11 shows a case where the area from the eye to the nose side is relatively larger than that from the eye to the ear side. In this case, conversely, the aberration is concentrated on the narrower ear side. In each case, the corridor length is short.
[0017]
Next, a method of manufacturing the request frame DF will be described based on the flowchart of FIG.
First, in step 1, shape data of the request frame DF is calculated. This is obtained by calculating the respective directions and lengths of the virtual straight lines L1 to L32 according to the method calculated for each of the reference frames BF. Then, the virtual straight lines L1 to L32 are replaced with those having a length approximating the above-described reference frames BF. For example, if L1 corresponding to the length closest to L1 of the request frame DF is L1 in the A type (standard type), this is replaced with L1 of the request frame DF.
Next, in step 2, the lens of the required frame DF is designed based on the positional relationship between the frame and the eye of the customer and the lens data of each reference frame BF according to the progressive zone length of the customer.
Specifically, the lens data at the corresponding position of each reference frame BF replaced for each of the virtual straight lines L1 to L32 of the replaced request frame DF is synthesized and adapted. At this time, it is possible to obtain lens data even for a part that is not actually measured by setting a fan-shaped area of equal angles to the virtual straight lines L1 to L32. When the adjacent portions are not connected smoothly, a correction process is performed. In the correction processing, it is conceivable that an adjacent portion is overlapped and an average value of data of the portion is adopted.
In the final stage of the process 2, it is checked whether the progressive zone length of the lens data of the synthesized request frame DF is appropriate, and the monitor 14 is notified of the result. That is, in the process 2, the design is made based on the lens data (for example, a lens having a progressive zone length of 17 mm) according to the customer's progressive zone length. When it is determined that the value is not appropriate, a warning is issued. This is calculated based on, for example, the lengths of the virtual straight lines L1 and L17 and the input corridor length data.
Such a notification means is provided because, for example, when the corridor is designed to be long and the top and bottom width of the frame is small, it is necessary to warn or confirm to the spectacle shop whether or not it is really OK.
[0018]
Next, processing is performed in step 3. In the present embodiment, the back side of the material block 10 is processed and ground based on a predetermined prescription frequency. As a result, it is possible to obtain a progressive-power lens having an optimum progressive-refractive surface corresponding to the required frame DF (still a round lens at this stage).
Next, in step 4, the periphery of the round lens is cut in accordance with the required frame DF shape.
[0019]
With this configuration, the first embodiment has the following effects.
(1) Unlike the related art, it is possible to provide an optimum progressive power lens adjusted for each required frame DF selected by the customer.
(2) Providing a more user-friendly product because it is possible to manufacture a progressive-power lens close to the customization of each customer because it can be designed in consideration of the length of the progressive zone and the interpupillary distance as customer-specific information. Becomes possible.
(3) Since the reference frame BF can be prepared and the required frame DF can be designed based on the reference frame, the cost can be reduced despite the fact that the design frame is not required and the order frame is almost made to order.
[0020]
(Embodiment 2)
In the second embodiment, as in the first embodiment, cutting and grinding are performed by the CAM device 11 shown in FIG. The configuration of the CAM device 11 is the same as that of the first embodiment. In the second embodiment, the shape data of the material block 10 and the lens shape of the progressive refraction surface of one reference frame BF (in the second embodiment, the reference frame BF of the standard type (A type)) are stored in the memory 17. Data has been entered as an initial value.
Hereinafter, a method of moving the aberration distribution by synthesizing a predetermined synthetic surface set according to the shape data of the request frame DF based on the standard lens shape will be described.
[0021]
As shown in FIG. 12, the circular virtual lens SR is designed based on lens shape data for forming a predetermined progressive refraction surface of the standard frame BF. As in the first embodiment, this lens shape data is lens shape data that takes into account the positional relationship between the frame and the eye, the vertical length of the frame, and the progressive zone length selected by the customer. Specifically, the virtual lens SR is lens shape data of a long progressive zone type shown in FIG. 6B.
Here, as shown in FIGS. 12 and 13, the x-axis and the y-axis are set in the plane direction of the virtual lens SR, and the z-axis is set in the height direction. In the second embodiment, the shape change of the surface in the z-axis direction of the trajectory of a straight line (radius) r orbiting in the counterclockwise direction with the predetermined nose side position being 0 degree about the geometric center O is determined by the predetermined progressive refraction It is made to compose on the surface. A simple example is represented by the following equation. Further, according to the above equation, the following trigonometric function graph of the combined surface is obtained, which is easier to understand.
It should be noted that the following equation of the composite surface is simplified for easy understanding of the method of the second embodiment, and is actually more complicated for fine adjustment of aberration for each shape of the required frame DF. An expression is set, and a graph based on the expression is also obtained as a graph with asymmetric, subtle curvature.
[0022]
For 0 ≦ θ <π / 4 and 7π / 4 ≦ θ <2π,
z (r, θ) = ar · (cos (2θ) + π / 2)
When π / 4 ≦ θ <3π / 4,
z (r, θ) = ar · 2 (π / 2−θ)
When 3π / 4 ≦ θ <5π / 4,
z (r, θ) = ar · (cos (2θ−π) −π / 2)
When 5π / 4 ≦ θ <7π / 4,
z (r, θ) = ar · 2 (θ-3π / 2)
a: coefficient, r: distance from center
[0023]
[Table 1]

[0024]
This will be described in more detail based on the above equations and graphs. As shown in the graph, at the 0-degree position (nose-side position) and the 180-degree (ear-side position: π) position, the z-axis is maximized, and given predetermined shapes of plus (swelling direction) and minus (sinking direction), respectively. . Further, since the amount of synthesis at this position is curved, a change in curvature appears as a change in curvature in a direction along a circle. On the other hand, at positions π / 4 ≦ θ <3π / 4 and 5π / 4 ≦ θ <7π / 4, which are separated from these positions, as shown in the graphs, they have a linear shape with no curvature. There is no change in the curvature in the direction. That is, although the aberrations on the ear side and the nose side are corrected with a curvature, the lens shape data of the virtual lens SR changes linearly when the distance from the ear side and the nose side is increased. It can be said that this equation is obtained by adjusting the aberration balance evenly especially around the ear side and the nose side. The numerical data corresponding to the composite surface is reflected on the numerical data of the lens shape data of the virtual lens SR at that position, and the shapes are synthesized.
[0025]
Next, a method of manufacturing the request frame DF will be briefly described based on the flowchart of FIG. In step 1, the above-described synthesis formula for synthesizing with the lens shape data of the virtual lens SR is created based on the shape of the request frame DF. Then, in step 2, the lens of the required frame DF is designed based on the synthesis formula.
Next, a lens of the required frame DF is obtained in steps 3 and 4. Steps 3 and 4 are the same as in the first embodiment.
[0026]
With this configuration, the second embodiment has the following effects.
(1) It is possible to provide an optimum progressive power lens adjusted for each required frame DF selected by the customer, unlike the conventional case.
(2) Providing a more user-friendly product because it is possible to manufacture a progressive-power lens close to the customization of each customer because it can be designed in consideration of the length of the progressive zone and the interpupillary distance as customer-specific information. Becomes possible.
(3) Since the required frame DF can be designed based on the virtual lens SR, the cost can be reduced despite the fact that the design frame does not require much labor and is close to being made to order.
[0027]
The present invention can be embodied with the following modifications.
In the above description, the steps 1 and 2 are performed by the CAM device 11. However, the process may be performed by another device, and the data may be input to the CAM device 11 to manufacture a lens.
In the first embodiment, the design patterns A to F are prepared after fixing the corridor length, but special conditions are set so that the corridor length changes depending on the frame shape. Is also good. For example, in the case of a horizontally long frame, the corridor is automatically shortened, and when the width of the top and bottom is relatively large, the corridor is made longer than the standard.
-The frame shape may be other shapes described above.
-Although the virtual straight line L of Embodiment 1 was set to 32 in the above, it is not limited to this.
[0028]
In the first embodiment, as the second shape data, the virtual straight lines L1 to L32 divided (subdivided) of each reference frame BF are most similar to the numerical values of the virtual straight lines L1 to L32 divided (subdivided) of the request frame DF. Although the selected one is selected, a plurality of virtual straight lines L1 to L32 may be selected, weighted and averaged. In this case, weighting may be performed on the corresponding second shape data of all the reference frames BF. For example, some (for example, the top three types) second shape data having a high approximation ratio are extracted and weighted. You may.
In the first embodiment, the round lens is processed to have an optimum progressive surface and then cut into a shape corresponding to the required frame DF. However, the cutting is performed first and then the optimum progressive surface is processed. May be applied.
The correction processing in the first embodiment is an example, and other correction processing methods can be freely used.
In the first embodiment, the round lens is processed to have an optimum progressive surface and then cut into a shape corresponding to the required frame DF. However, the cutting is performed first and then the optimum progressive surface is processed. May be applied.
In the second embodiment, when any asymmetry is given to the nose-side and ear-side aberration distributions, in the above description, the orbit is made to rotate around the geometric center O in the counterclockwise direction. May be set around the point. In addition, the circumferential direction does not matter.
In the second embodiment, the surface shape obtained by the above equation is combined with the base lens shape. However, the base lens shape data may be corrected as the curvature parameter obtained by the above equation. Good.
In addition, the present invention can be freely implemented without departing from the spirit of the present invention.
[0029]
Other technical ideas of the present invention that can be grasped from the above embodiment will be described as additional notes below.
(1)
1) The required eyeglass frame shape is subdivided, and first shape data is calculated as numerical data for each part.
2) A plurality of reference frame shapes are prepared, each reference frame shape is subdivided, and second shape data is calculated as numerical data for each portion.
3) The first shape data and the second shape data are compared for each portion obtained by subdividing the required eyeglass frame shape, and based on a difference between the first shape data and the second shape data. Each of the second shape data is weighted.
4) The reference lens data for each of the weighted second shape data of each of the portions is calculated according to the weighting, and the average value thereof is taken to obtain each of the subdivided required eyeglass frame shapes. Correction lens data is obtained by applying to parts.
3. The method according to claim 2, wherein the progressive-power lens is manufactured according to 1) to 4).
(2) The method for manufacturing a progressive-power lens according to supplementary note 1, wherein a correction process is performed on each of the subdivided portions so that adjacent portions become smooth continuous surfaces.
(3) The progression described in Supplementary Note 1 or 2, wherein the unique information of the customer includes position information between a predetermined position for specifying a pupil position at the time of wearing and a predetermined position of the lens. A method for manufacturing a refractive lens.
(4) The method for manufacturing a progressive power lens according to any one of supplementary notes 1 to 3, wherein the customer-specific information includes progressive band length information set for each customer.
(5) When the required spectacle frame has a characteristic that the area on the ear side is large and the area on the nose side is small as compared with the same reference shape frame when compared with the predetermined reference shape frame, the aberration is changed to the nose side. The method for manufacturing a progressive-power lens according to claim 1, wherein the correction is performed so as to concentrate.
This means, for example, an eggplant type case in which the area below the ear side is wider than the standard inverted trapezoidal shape as described above.
(6) When the required spectacle frame has a characteristic in which the area on the nose side is large and the area on the ear side is small as compared with the frame with the same reference shape when compared with the predetermined reference shape frame, the aberration is transmitted to the ear side. The method for manufacturing a progressive-power lens according to claim 1, wherein the correction is performed so as to concentrate.
(7) If the progressive zone length of the progressive-power lens manufactured based on the corrected lens data is not within the appropriate range according to the required frame, the notification unit informs that fact. The method for manufacturing a progressive-power lens according to claim 1, wherein:
Here, the notification means is the monitor 14 in the above description, but may be other means such as an audio notification.
(8) The progressive refracting surface of the required spectacle frame lens is formed on a back surface of a semi-finished product having a spherical front surface. A method for manufacturing a progressive-power lens according to any one of the above.
[0030]
[Brief description of the drawings]
FIG. 1 is a flowchart for explaining an outline of information flow in the present invention.
FIG. 2 is a front view of a material block used in the embodiment of the present invention.
FIG. 3 is a conceptual diagram of a CAM device used in the embodiment of the present invention.
FIG. 4 is a flowchart illustrating manufacturing steps of a progressive-power lens according to the first and second embodiments.
FIG. 5 is a conceptual diagram illustrating a method of specifying a frame shape according to the first embodiment.
FIGS. 6A and 6B are explanatory diagrams illustrating a standard frame and lens characteristics optimal for the frame.
FIGS. 7A and 7B are explanatory diagrams illustrating a horizontally long frame and lens characteristics optimal for the frame.
FIG. 8 is an explanatory diagram illustrating an eggplant-shaped frame and lens characteristics optimal for the frame.
FIG. 9 is an explanatory diagram illustrating a round frame and lens characteristics optimal for the frame.
FIG. 10 is an explanatory diagram illustrating optimal lens characteristics when the ear side is wider than the nose side in a horizontal frame.
FIG. 11 is an explanatory diagram illustrating optimal lens characteristics when the nose side is wider than the ear side in a horizontal frame.
FIG. 12 is an explanatory diagram illustrating a method of combining a combined surface with a virtual lens according to the second embodiment.
FIG. 13 is an explanatory diagram illustrating a method of synthesizing a synthetic surface with a virtual lens according to the second embodiment.
FIG. 14 is a conceptual diagram illustrating a method of specifying a frame shape according to the second embodiment.
[Explanation of symbols]
11: CAM device, BF: Reference frame.

Claims (7)

A distance portion region, a near portion region located below the distance portion region and having a larger refractive power than the distance portion region, and a progressive portion disposed between these regions and having a progressively changing refractive power. A method of manufacturing a progressive power lens having a band,
A free-form surface formed on at least one of the front surface or the back surface of the required eyeglass frame lens based on the frame shape information of the required eyeglass frame and the unique information of the customer wearing the required eyeglass frame, so as to be suitably formed. A method of manufacturing a progressive-power lens. In order to suitably form the free-form surface of the lens manufactured corresponding to the required spectacle frame, a difference between the required spectacle frame shape and the reference frame shape is calculated as numerical data, and a predetermined value is determined based on the numerical data. Correcting the reference lens data set in accordance with the same reference frame shape in order to form the free-form surface suitably, calculating the corrected lens data, and based on the corrected lens data, the progressive refraction suitable for the required spectacle frame. 2. A method for manufacturing a progressive-power lens according to claim 1, wherein the power lens is manufactured. 1) The required eyeglass frame shape is subdivided, and first shape data is calculated as numerical data for each part.
2) A plurality of reference frame shapes are prepared, each reference frame shape is subdivided, and second shape data is calculated as numerical data for each portion.
3) The first shape data and the second shape data are compared for each portion obtained by subdividing the required eyeglass frame shape, and a desired second shape having an approximate difference from the second shape data is obtained. Select the shape data of.
4) The reference lens data of each of the selected second shape data of each of the portions is applied to each of the subdivided portions of the required eyeglass frame shape to obtain corrected lens data.
3. The method according to claim 2, wherein the progressive-power lens is manufactured according to 1) to 4). 4. The method for manufacturing a progressive-power lens according to claim 3, wherein a correction process is performed on each of the subdivided portions so that adjacent portions become smooth continuous surfaces. In order to appropriately shape the free-form surface of the lens manufactured corresponding to the required spectacle frame, the free-form surface is expressed by a predetermined function with respect to the reference lens surface of the progressive-power lens set to the predetermined free-form surface as a reference. 2. A method of manufacturing a progressive-power lens according to claim 1, wherein the progressive-power lens corresponding to the required spectacle frame is manufactured by synthesizing the surface data. 6. The customer-specific information according to claim 1, wherein the customer-specific information includes position information between a predetermined position for specifying a pupil position at the time of wearing and a predetermined position of the lens. A method for manufacturing a progressive power lens. 7. The method of manufacturing a progressive-power lens according to claim 1, wherein the unique information of the customer includes progressive zone length information set for each customer.

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