WO2022138641A1 - Verre de lunettes à foyer unique, procédé de conception de verre de lunettes à foyer unique, procédé de fabrication de verre de lunettes à foyer unique et dispositif de conception de verre de lunettes à foyer unique - Google Patents

Verre de lunettes à foyer unique, procédé de conception de verre de lunettes à foyer unique, procédé de fabrication de verre de lunettes à foyer unique et dispositif de conception de verre de lunettes à foyer unique Download PDF

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Publication number
WO2022138641A1
WO2022138641A1 PCT/JP2021/047326 JP2021047326W WO2022138641A1 WO 2022138641 A1 WO2022138641 A1 WO 2022138641A1 JP 2021047326 W JP2021047326 W JP 2021047326W WO 2022138641 A1 WO2022138641 A1 WO 2022138641A1
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WIPO (PCT)
Prior art keywords
spectacle lens
refractive index
single focus
focus spectacle
optical axis
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PCT/JP2021/047326
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English (en)
Japanese (ja)
Inventor
好徳 吉田
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株式会社ニコン・エシロール
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Publication of WO2022138641A1 publication Critical patent/WO2022138641A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses

Definitions

  • the present invention relates to a single focus spectacle lens, a method for designing a single focus spectacle lens, a method for manufacturing a single focus spectacle lens, and a device for designing a single focus spectacle lens.
  • Patent Document 1 reports a spectacle lens using an optical material whose refractive index changes depending on the distance from the optical axis. It is desirable to provide a spectacle lens having improved optical performance such as aberration by utilizing a non-uniform refractive index distribution.
  • the single focus spectacle lens is a single focus spectacle lens having a non-uniform refractive index and the optical magnification is not defined only by the refractive index, and is the same as the single focus spectacle lens.
  • the non-point aberration is 0.15D or less, and the difference between the refractive index at the position and the refractive index at the optical axis is 0.015 or more.
  • the method for designing a single focus spectacle lens is a method for designing a single focus spectacle lens having a non-uniform refractive index and the optical magnification is not defined only by the refractive index.
  • the setting regarding the aberration is made so that the non-point aberration is 0.15D or less, and the refractive index at the position is used to determine the optical axis. It includes setting the refractive index so that the difference obtained by subtracting the refractive index is 0.015 or more.
  • the method for manufacturing a single focus spectacle lens manufactures a single focus spectacle lens designed by the method for designing a single focus spectacle lens according to the second aspect.
  • the single focus spectacle lens design device is a single focus spectacle lens design device having a non-uniform refractive index and the optical magnification is not defined only by the refractive index.
  • the light is derived from the ablation setting unit that sets the ablation so that the non-point aberration is 0.15D or less, and the refraction coefficient at the position.
  • a refractive index setting unit for setting the refractive index so that the difference obtained by subtracting the refractive index on the shaft is 0.015 or more is provided.
  • FIG. 1A is a conceptual diagram when the single focus spectacle lens of one embodiment is viewed from the object side.
  • FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A.
  • FIG. 2 is a graph showing the difference between the refractive index at a position at each distance from the optical axis and the refractive index at the optical axis in the single focus spectacle lens of one embodiment.
  • FIG. 3 is a conceptual diagram for explaining the setting of astigmatism and the average refractive power in the method for designing a single-focus spectacle lens according to an embodiment.
  • FIG. 4 is a conceptual diagram showing a configuration of a single focus eyeglass lens design device according to an embodiment.
  • FIG. 5 is a flowchart showing a flow of a design method and a manufacturing method of a single focus spectacle lens according to an embodiment.
  • the single focus spectacle lens is appropriately referred to as a single focus lens.
  • the unit of refractive power shall be represented by a diopter (D) unless otherwise specified.
  • the upper side and the lower side of the spectacle lens shall be based on the positional relationship of the lens when the spectacle lens is worn.
  • refractive power refers to this average refractive power.
  • refractive power error The difference between the maximum refractive power and the minimum refractive power at each position of the single focus lens in the light ray passing through the rotation point is defined as astigmatism.
  • FIG. 1A is a conceptual diagram showing a single focus lens L, which is a single focus spectacle lens of the present embodiment.
  • FIG. 1A is a view of the single focus lens L viewed from the object side along the optical axis AX of the single focus lens L, and shows the object side surface S1 of the single focus lens L.
  • the single focus lens L is in a state before the lens is processed according to the shape of the spectacle frame (state before the ball grinding process), and is formed in a circular shape in a plan view.
  • the Z axis is taken parallel to the optical axis AX, and the Y axis and the X axis are taken in the vertical direction and the horizontal direction when the single focus lens L is worn, respectively.
  • FIG. 1B is a cross-sectional view taken along the line AA in FIG. 1A.
  • the AA cross section is a YZ plane including the optical axis AX. Hatching of the cross section of the single focus lens L is omitted.
  • the single focus lens L has an object side surface S1 located on the object side and an eyeball side surface S2 located on the eyeball side when worn.
  • the side surface S1 of the object and the side surface S2 of the eyeball have a convex shape toward the object side along the optical axis AX.
  • the side surface S1 of the object and the side surface S2 of the eyeball may be concave or convex, respectively, and these shapes are not particularly limited unless the optical magnification is defined only by the refractive index distribution.
  • the single focus lens L may have a positive refractive power or may have a negative refractive power.
  • the single focus lens L is rotationally symmetric with respect to the optical axis AX, but is not limited thereto.
  • the single focus lens L has an object side surface S1 or an eyeball side surface S2 as a cylindrical surface, a toric surface, or an toric surface (asphericalized toric surface) for a wearer who is formulated to correct astigmatism. ) Can be provided with the function of astigmatism correction by making the surface defined by the mathematical formula including the component corresponding to).
  • an aspherical surface can be used to improve optical performance on the side away from the optical axis AX and close to the frame, which is easily affected by aberrations.
  • the object side surface S1 is preferably a rotationally symmetric, aspherical surface or spherical surface.
  • the side surface S2 of the eyeball can be a rotationally symmetric aspherical surface or a spherical surface, and is preferably an toric surface, a toric surface, or a cylindrical surface.
  • the single focus lens L has a non-uniform refractive index.
  • the difference obtained by subtracting the refractive index at the position where the optical axis AX passes in the single focus lens L from the refractive index at a certain position of the single focus lens L is hereinafter referred to as a refractive index difference.
  • FIG. 2 is a graph showing the distance (horizontal axis) of the single focus lens L from the optical axis AX and the difference in the refractive index (vertical axis) at the position at the distance.
  • the refractive index distribution is rotationally symmetric with respect to the optical axis AX.
  • the refractive index distribution is rotationally symmetric with respect to the optical axis AX from the viewpoint of facilitating the design. And so on, it is not necessarily limited to this.
  • the single focus lens L has a refractive index difference of a predetermined value or more at a position where the distance from the optical axis AX is 20 mm. In other words, there is a position on the circumference 20 mm from the optical axis AX where the difference in refractive index is equal to or greater than a predetermined value.
  • This predetermined value is a positive value and can be 0.015, 0.020, or 0.025.
  • the difference in refractive index is preferably set so that the change in refractive power with respect to the distance from the optical axis AX is small. It is preferable that the refractive index difference is large enough to sufficiently correct the refractive power error in order to improve the performance of the lens.
  • the difference in refractive index is large, it can be suitably corrected when the refractive power error is large and tends to be a problem.
  • the refractive index difference is too large, it becomes difficult to manufacture the single focus lens L. Therefore, the refractive index difference at the above position 20 mm from the optical axis AX should be appropriately set to 0.1 or less, 0.05 or less, or the like. Can be done.
  • FIG. 3 is a conceptual diagram for explaining the influence of the difference in refractive index on the refractive power.
  • These refractive powers are shown as relative values by the difference obtained by subtracting the refractive powers on the optical axis.
  • the difference in the refractive power between the meridional ray and the sagittal ray is as small as 0.1 D or less from the position of about 20 mm from the optical axis, and the astigmatism is suppressed to about this value.
  • the refractive powers of the meridional rays and the sagittal rays are as large as 0.5D or more at the position where the distance from the optical axis is 20 mm, and the average refractive power changes greatly as the distance from the optical axis increases.
  • the difference in refractive index at a position at a predetermined distance from the optical axis AX is set to a positive predetermined value or more, so that astigmatism is suppressed and the difference from the optical axis AX is suppressed. It is possible to reduce the refractive index error that tends to increase as the distance increases.
  • the suppression of this refractive power error is schematically shown by an arrow A1. Since the graph of FIG. 3 is an example in which the single focus lens L has a negative spherical power, the relative value of the refractive power changes in the negative direction due to the increase in the refractive index.
  • the refractive power error can be reduced.
  • the single focus lens L in which astigmatism and refractive power error are suppressed in this way the object can be seen more clearly, and even a wearer with a small accommodation force can easily focus on the object. This effect becomes more remarkable at a position away from the optical axis AX.
  • astigmatism is preferably 0.15D or less and 0.10D or less at a position where the distance from the optical axis AX is 20 mm.
  • the astigmatism is 0.15D or less, preferably 0.10D or less, on the circumference having a distance from the optical axis AX of 20 mm.
  • the smaller the astigmatism at the position the more clearly the object can be seen through the position and its vicinity, which is preferable.
  • the design is such that astigmatism is suppressed.
  • the astigmatism is 0.15D or less and 0.10D or less at any position where the distance from the optical axis AX is 20 mm, so that the object can be clearly seen through a wider range. It is more preferable because it can be used.
  • the refractive index increases in this order at each position of 0 mm, 5 mm, 10 mm and 15 mm from the optical axis AX in a certain radial direction with the optical axis AX as the central axis.
  • the longer the distance from the optical axis the larger the refractive power error tends to be. Therefore, by increasing the distance from the optical axis AX and increasing the refractive index, it is possible to suppress the refractive power error over a wider range.
  • the refractive index monotonically increases from the optical axis AX to a position at a predetermined distance in a certain radial direction.
  • This predetermined distance is not particularly limited as long as the optical performance required for the single focus lens L is satisfied, but is preferably 15 mm from the viewpoint of facilitating manufacturing.
  • the single focus lens L has a refractive index difference of a predetermined value or more at any position where the distance from the optical axis AX is 20 mm.
  • This predetermined value can be 0.015, 0.020, or 0.025.
  • the refractive power error can be adjusted in the region surrounding the optical axis AX of the single focus lens L in which astigmatism is suppressed.
  • the refractive index increases in this order at each position of 0 mm, 5 mm, 10 mm, and 15 mm from the optical axis AX in any radial direction with the optical axis AX as the central axis. ..
  • the refractive power error can be suppressed over a wider range in the region surrounding the optical axis AX of the single focus lens L in which astigmatism is suppressed.
  • the refractive index monotonically increases from the optical axis AX to a position at a predetermined distance in any radial direction. This predetermined distance is not particularly limited as long as the optical performance required for the single focus lens L is satisfied, but is preferably 15 mm from the viewpoint of facilitating manufacturing.
  • astigmatism is 0.15D or less, preferably 0.10D or less, and the refractive index difference is 0.015 or more at any position where the distance of the single focus lens L from the optical axis AX is 20 mm. It can be 0.020 or more or 0.025 or more. Thereby, in the region surrounding the optical axis AX, it is possible to provide the single focus lens L in which astigmatism is suppressed and the refractive power error is well adjusted.
  • it is preferably 0.25D or less, preferably 0.10D or less.
  • the single focus lens L includes plastic or glass.
  • the single focus lens L is preferable because it contains plastic and can be easily processed.
  • the fixed focal length lens L contains plastic, it is preferable to process it using a 3D printer because it can provide a fixed focal length lens L that has been designed and processed more precisely.
  • FIG. 4 is a diagram showing a configuration of a manufacturing system according to this embodiment.
  • the manufacturing system 10 is a system for manufacturing the single focus lens L, and includes a design device 2, a processing machine control device 3, and a spectacle lens processing machine 4.
  • the processing machine control device 3 is communicably connected to the design device 2, and the spectacle lens processing machine 4 is communicably connected to the processing machine control device 3.
  • the design device 2 includes a processing unit 21, a storage unit 22, and a communication unit 23.
  • the processing unit 21 includes a design unit 200.
  • the design unit 200 includes a first setting unit 210, a second setting unit 220, and an optimization unit 230.
  • the design device 2 includes a computer and designs the single focus lens L.
  • the processing unit 21 includes a processor such as a CPU, and performs various processing such as design processing for designing the single focus lens L by reading a program mounted in the storage unit 22 or the like into a memory and executing the program.
  • the physical configuration of the processing unit 21 is not particularly limited as long as the design processing performed by the processing unit 21 is possible.
  • the design unit 200 of the processing unit 21 performs design processing of the single focus lens L.
  • the design unit 200 acquires the prescription data of the wearer and the order data for the ordered single focus lens L from the ordering device or the ordering device for the single focus lens L via the communication unit 23.
  • the prescription data includes data such as the spherical power, astigmatic power, and astigmatic axis of the single focus lens prescribed by the wearer.
  • the order data includes data such as a model or a frame of the ordered single focus lens L.
  • the first setting unit 210 of the design unit 200 functions as an aberration setting unit for setting the target astigmatism and the target average refractive power of the single focus lens L to be designed.
  • a target refractive power error may be set instead of the target average refractive power.
  • Target astigmatism and target average power are set based on prescription data and ordering data.
  • the second setting unit 220 of the design unit 200 functions as a refractive index setting unit that sets the refractive index distribution of the single focus lens L to be designed. When optimizing the refractive index distribution including the refractive index as described below, any value can be set as the initial setting, or a predetermined refractive index distribution is set and fixed to be optimized.
  • the portion 230 may optimize only the shape.
  • the second setting unit 220 can set the shape of the object side surface S1 and the eyeball side surface S2 of the single focus lens L to be designed, if necessary.
  • the optimization unit 230 of the design unit 200 performs the optimization design of the single focus lens L.
  • the data indicating the design of the single focus lens L is called design data.
  • design data the shapes of the side surface S1 of the object and the side surface S2 of the eyeball and the refractive index distribution are shown.
  • the Z coordinates of the side surface S1 of the object and the side surface S2 of the eyeball, and the value of the refractive index are associated with each point indicated by the XY coordinates.
  • the optimization unit 230 changes the Z coordinate of the object side surface S1 or the eyeball side surface S2 in the design data, or the value of the refractive index, and evaluates the changed design data. This evaluation is based on the target astigmatism and the target average power. For example, the optimization unit 230 calculates a numerical value indicating how well the target astigmatism and the target average refractive power are matched by a predetermined mathematical formula. The optimization unit 230 determines whether or not to redesign depending on whether or not the numerical value satisfies a condition based on a predetermined threshold value. When redesigning, the design data is changed again and the evaluation is performed again. If the design is not redesigned, the design is terminated assuming that the design is completed based on the obtained design data. In this way, the optimization unit 230 optimizes the design by performing the combination of the change of the design data and the evaluation one or more times. It is preferable that the optimization unit 230 changes the refractive index distribution at least once in the optimization design.
  • the storage unit 22 includes a storage medium and stores data and programs necessary for designing the single focus lens L.
  • the communication unit 23 includes a communication device capable of communicating with an ordering device, an ordering device, and the like, receives data necessary for designing the single focus lens L, and transmits completed design data.
  • the processing machine control device 3 controls the spectacle lens processing machine 4 to process the single focus lens L.
  • FIG. 5 is a flowchart showing the flow of the design method and the manufacturing method of the single focus lens according to the present embodiment. Steps S101 to S111 are performed by the design unit 200. Step S113 is performed by the processing machine control device 3 controlling the spectacle lens processing machine 4.
  • step S101 the design unit 200 acquires the prescription data of the wearer and the data about the ordered single focus lens L.
  • step S103 is started.
  • step S103 the first setting unit 210 sets the target astigmatism and the target average refractive power of the single focus lens L to be designed.
  • step S104 is started.
  • step S104 the second setting unit 220 sets the shape of the single focus lens L to be designed.
  • step S105 the second setting unit 220 sets the refractive index distribution of the single focus lens L to be designed.
  • step S107 the optimization unit 230 changes at least one of the refractive index distribution and the lens shape in the design data.
  • step S109 is started.
  • step S109 the optimization unit 230 determines whether or not the design data after the change in step S107 satisfies the requirements based on the target astigmatism and the target average refractive power. If the requirement is satisfied, the optimization unit 230 affirms step S109. In this case, step S111 is started. If the requirement is not satisfied, the optimization unit 230 makes a negative determination in step S109. In this case, step S107 is started.
  • step S111 the optimization unit 230 determines the refractive index distribution and shape of the single focus lens L, and appropriately stores them in the storage unit 22 or the like as completed design data.
  • step S113 is started.
  • step S113 the manufacturing system 100 manufactures the single focus lens L.
  • the processing unit 21 outputs the design data of the single focus lens L determined in step S111 to the processing machine control device 3.
  • the processing machine control device 3 sends a processing instruction to the spectacle lens processing machine 4 based on the design data output from the design device 2.
  • the spectacle lens processing machine 4 processes and manufactures the single focus lens L based on the design data.
  • the single focus lens L manufactured by the spectacle lens processing machine 4 is shipped to a spectacle store, fitted into a spectacle frame, and provided to a customer (wearer).
  • step S113 is completed, the process is terminated.
  • the single focus spectacle lens of the present embodiment is a single focus spectacle lens having a non-uniform refractive index and the optical magnification is not defined only by the refractive index, and is from the optical axis AX of the single focus lens L.
  • the non-point aberration is 0.15D or less
  • the difference (refractive index difference) obtained by subtracting the refractive index on the optical axis AX from the refractive index at the position is 0.015 or more.
  • the method for designing the single focus spectacle lens of the present embodiment includes changing the design data indicating the design of the single focus lens L and evaluating the changed design data, and the change and the evaluation.
  • the design is optimized by performing the combination of the above once or more. Further, in addition to the change, optimization for changing the refractive index distribution of the single focus lens L can be performed in combination. As a result, not only the lens shape but also the refractive index distribution can be changed, and the single focus spectacle lens can be designed more flexibly.
  • the refraction setting unit 210 has a non-point aberration of 0.15D or less at a position where the distance from the optical axis AX of the single focus lens L is 20 mm.
  • the refractive index setting unit 220 sets the refractive index so that the difference between the refractive index at the position and the refractive index on the optical axis AX is 0.015 or more. This makes it possible to provide a spectacle lens having improved optical performance such as aberration by utilizing the non-uniform refractive index distribution.
  • a single focus lens with a uniform refractive index was designed.
  • the refractive index was 1.600 and the astigmatic power was 0.
  • the side surface of the eyeball and the side surface of the object are rotationally symmetric aspherical surfaces.
  • astigmatism is designed to be suppressed to 0.10D or less at a position 20 mm from the optical axis.
  • Table 1 is a table of equation (1) and various coefficients showing the aspherical shape of the designed single focus lens.
  • equation (1) z is the coordinates in the optical axis direction, r is the distance from the optical axis, and c is the reciprocal of the radius of curvature.
  • S indicates the spherical power
  • the front surface of the lens indicates the side surface of the object
  • the rear surface of the lens indicates the side surface of the eyeball
  • the cornic constant k and the aspherical coefficients ⁇ 2, ⁇ 3, ⁇ 4 and ⁇ 5 are the coefficients of the equation (1).
  • "e-x" in the table indicates 10 minus x power.
  • Example 2 A single focus lens having the same shape as the comparative example was designed.
  • the refractive index distribution is rotationally symmetric with respect to the optical axis, and the refractive index is set to monotonically increase in the radial direction from the optical axis to a range of 30 mm so that the refractive power does not change.
  • a and B in Table 2, C and D in Table 3, and E in Table 4 show the refractive index n, the refractive power, and astigmatism at each distance from the optical axis of the single focus lenses of Comparative Examples and Examples. It is a table.
  • a to E have spherical powers of +6.00D (Comparative Example 1, Example 1), +3.00D (Comparative Example 2, Example 2), -3.00D (Comparative Example 3, Example 3), and-, respectively.
  • 6.00D Comparative Example 4, Example 4
  • ⁇ 9.00D Comparative Example 5, Example 5
  • the distribution of the refractive index shown in each of the above-described embodiments is set in any two directions orthogonal to each other on the XY plane orthogonal to the Z axis.
  • a single focus lens for random vision can be obtained.
  • an astigmatic lens of S + 3.00D / C + 3.00D can be obtained. Is easily understood by those skilled in the art.
  • Design equipment 9 Coordinate system 10 Manufacturing system 21 Processing unit 200
  • Design unit 210 1st setting unit 220
  • Optimization unit AX Optical axis L

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  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)

Abstract

La présente invention concerne un verre de lunettes à foyer unique dont l'indice de réfraction est non uniforme. Le grossissement optique n'est pas défini uniquement par l'indice de réfraction, l'astigmatisme est au plus égal à 0,15D dans une position à une distance de 20 mm de l'axe optique du verre de lunettes à foyer unique et la différence obtenue par soustraction de l'indice de réfraction au niveau de l'axe optique à partir de l'indice de réfraction à ladite position est au moins égale à 0,015.
PCT/JP2021/047326 2020-12-21 2021-12-21 Verre de lunettes à foyer unique, procédé de conception de verre de lunettes à foyer unique, procédé de fabrication de verre de lunettes à foyer unique et dispositif de conception de verre de lunettes à foyer unique WO2022138641A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52115242A (en) * 1976-03-22 1977-09-27 American Optical Corp Method of making offfaxis correction spectacle lens
JPS62296119A (ja) * 1986-05-20 1987-12-23 オプテイツシエ．ウエルケ．ゲ−．ロ−デンストツク 光軸のまわりで回転対称的に変化する傾度屈折率をもつ均一強度めがねレンズ
JPH01316720A (ja) * 1988-04-25 1989-12-21 Essilor Internatl (Cie Gen Opt) 屈折率に勾配があり幾何学的倍率とは無関係である眼鏡用単焦点レンズ
JP2019537052A (ja) * 2016-10-21 2019-12-19 カール ツァイス ヴィジョン インターナショナル ゲーエムベーハー 眼鏡レンズおよびその製造のための方法、特に３ｄ印刷方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52115242A (en) * 1976-03-22 1977-09-27 American Optical Corp Method of making offfaxis correction spectacle lens
JPS62296119A (ja) * 1986-05-20 1987-12-23 オプテイツシエ．ウエルケ．ゲ−．ロ−デンストツク 光軸のまわりで回転対称的に変化する傾度屈折率をもつ均一強度めがねレンズ
JPH01316720A (ja) * 1988-04-25 1989-12-21 Essilor Internatl (Cie Gen Opt) 屈折率に勾配があり幾何学的倍率とは無関係である眼鏡用単焦点レンズ
JP2019537052A (ja) * 2016-10-21 2019-12-19 カール ツァイス ヴィジョン インターナショナル ゲーエムベーハー 眼鏡レンズおよびその製造のための方法、特に３ｄ印刷方法

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