CN114647101B - Base curve measuring and calculating method based on mirror frame customized lens - Google Patents
Base curve measuring and calculating method based on mirror frame customized lens Download PDFInfo
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- CN114647101B CN114647101B CN202210282420.8A CN202210282420A CN114647101B CN 114647101 B CN114647101 B CN 114647101B CN 202210282420 A CN202210282420 A CN 202210282420A CN 114647101 B CN114647101 B CN 114647101B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000003754 machining Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims description 18
- 208000001491 myopia Diseases 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 241000219739 Lens Species 0.000 description 103
- 238000005452 bending Methods 0.000 description 11
- 230000008859 change Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 5
- 230000004438 eyesight Effects 0.000 description 3
- 230000004379 myopia Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 206010020675 Hypermetropia Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004305 hyperopia Effects 0.000 description 1
- 201000006318 hyperopia Diseases 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C13/00—Assembling; Repairing; Cleaning
- G02C13/003—Measuring during assembly or fitting of spectacles
-
- 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
- G02C7/024—Methods of designing ophthalmic lenses
- G02C7/028—Special mathematical design techniques
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention provides a base curve measuring and calculating method based on customized lenses of a lens frame, wherein a worker measures the radian of the inner edge of the lens frame, the lens frame comprises a frame body and a lining clamped with the inner ring of the frame body, the method for measuring the radian of the inner edge of the lens frame is to fixedly mount the lining on the inner edge of the lens frame, then the center position of the upper edge of the lining is selected for measurement to obtain the radian value A of the lens frame, the worker calculates the required machining luminosity F according to the refractive index of the selected lenses, and then the customized base curve E and luminosity surface camber value G are confirmed according to the machining luminosity F. According to the method for measuring and calculating the base curve of the lens based on the customized lens of the lens frame, in personalized customization service, the base curve of the lens is measured and calculated accurately, the measuring and calculating method is widely applicable, the assembly requirement of the lens frame can be met, the customized base curve of the lens is quantized and standardized, the requirements of reducing manufacturing cost and improving manufacturing efficiency of different customization requirements are met.
Description
Technical Field
The invention belongs to the field of lens manufacturing, and particularly relates to a base curve measuring and calculating method based on a mirror frame customized lens.
Background
Along with the continuous updating of glasses market mirror holder material, style, the mirror holder such as TR, thin steel is because material elasticity is high, and after the lens routine assembly, mirror face angle, external tension angle can change and be difficult for the adjustment along with the radian change of lens, and some sunglasses mirror holders, motion money mirror holder, because the radian is great, the bending of spectacle lens base is most less now, causes the assembly difficulty, and consequently the bending of lens base custom-made has revealed its importance.
The customization of the lens base curve can be determined through measurement and calculation, so that the lens base curve can be reasonably customized, the requirement of the eyeglass frame assembly can be met, the required base curve of the lens can be determined according to factors considered when the lens base curve is determined, and the lens base curve data of different customization are quantized and standardized so as to meet different customization requirements, reduce the manufacturing cost and improve the manufacturing efficiency, and the method is a problem to be solved at present.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for measuring and calculating a base curve based on a customized lens of a lens frame, so as to solve the problems of different customization requirements, high manufacturing cost and low manufacturing efficiency in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a base curve measuring and calculating method based on a mirror bracket custom-made lens comprises the following specific steps: the method for measuring the radian of the inner edge of the eyeglass frame comprises the steps that the lining is fixedly installed on the inner edge of the eyeglass frame, then the center position of the upper edge of the lining is selected for measurement, the radian value of the eyeglass frame is A, the worker calculates that the required machining luminosity is F according to the refractive index of the selected lens, and then the custom-made base curve E and the luminosity surface camber value G are confirmed according to the machining luminosity F.
Further, the custom base curve e=f/2+A is confirmed according to the machining luminosity F, and the rear luminosity surface curvature value g=f-E.
Further, the method for calculating the required machining luminosity F according to the refractive index of the lens comprises the following steps: the radius of curvature of the lens is calculated from the base value of the refractive index of the lens and the initial luminosity F1.
Further, the radii of curvature of the two surfaces of the lens are r1 and r2, the refractive index of the lens is n, and the basic value of n is 1.523, according to the following steps:and->The radius of curvature is calculated to be r1 and r2, and then the refractive index of the selected lens is substitutedAnd obtaining the actual processing luminosity.
Further, the lens is a near vision lens, F1 is a base curve value of the outer surface of the near vision lens, and F2 is a luminosity face value of the inner surface of the near vision lens.
Further, the lens is a presbyopic piece, F1 is the external power value of the presbyopic piece, and F2 is the base curve value of the internal surface of the presbyopic piece.
Compared with the prior art, the method for measuring and calculating the base curve based on the customized lens of the spectacle frame has the following beneficial effects: in personalized customization service, the method is used for measuring and calculating the base curve of the lens accurately, and the measuring and calculating method is widely applicable, can meet the assembly requirement of the lens frame, and enables the base curve of the lens customized based on the lens frame not to be too large or too small, so that the customized base curve data of the lens are quantized and standardized, and the requirements of reducing manufacturing cost and improving manufacturing efficiency of different customization requirements are met.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are used for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The present invention will be described in detail with reference to examples.
A base curve measuring and calculating method based on a mirror bracket custom-made lens comprises the following specific steps: the method for measuring the radian of the inner edge of the eyeglass frame comprises the steps that the lining is fixedly installed on the inner edge of the eyeglass frame, then the center position of the upper edge of the lining is selected for measurement, the radian value of the eyeglass frame is A, the worker calculates that the required machining luminosity is F according to the refractive index of the selected lens, and then the custom-made base curve E and the luminosity surface camber value G are confirmed according to the machining luminosity F.
The custom base curve e=f/2+A is confirmed from the machining luminosity F, the rear luminosity face camber value g=f-E.
The method for calculating the required processing luminosity F according to the refractive index of the lens comprises the following steps: the radius of curvature of the lens is calculated from the base value of the refractive index of the lens and the initial luminosity F1.
The radii of curvature of the two faces of the lens are r1 and r2 respectively, the refractive index of the lens is n, and the basic value of n is 1.523, according to the following:and->The radius of curvature is calculated to be r1, r2, and then substituted into the selected lens refractive indexAnd obtaining the actual processing luminosity.
The lens is a near vision lens, F1 is the base curve value of the outer surface of the near vision lens, and F2 is the luminosity face value of the inner surface of the near vision lens.
The lens is a presbyopic piece, F1 is the external power value of the presbyopic piece, and F2 is the base curve value of the internal surface of the presbyopic piece.
The following steps are the measurement steps in practical application
1. The method for measuring the radian of the glasses frame comprises the following steps:
when measuring the radian of the mirror holder, because the radian of the surface of the mirror rim and the radian of the groove of the mirror holder are different, in daily work application, the radian of the mirror holder is actually measured by measuring the camber of the groove of the mirror holder, and the following three different measuring methods are compared:
1. full frame, slotted frame radian measurement:
firstly, a method: measuring the radian of a rim
Measuring the inner or outer side of the rim; because the mirror circle is smoother, the accuracy of the measured value is poor.
Secondly, the method: measuring lining and sunglasses lens
Measuring the horizontal position of the geometric center of the lens; the lining and the sun lens are mostly produced by injection molding technology, the surface flatness is poor, the measuring positions are different, the measuring results are different, and the measured value is unstable.
The third method comprises the following steps: non-detachable lens measurement
The center position of the rim of the lens is measured.
The three ways of measuring are different, and the three ways of measuring are the closest to the bending degree of the groove of the glasses frame.
2. Radian measurement of a punching frame:
the stake head mirror frame before (be fit for near vision lens):
measuring position: the anterior surface of the patch, the horizontal line between the nose-side pile head and the temporal-side pile head.
Stake head mirror frame behind the (be fit for the far vision lens):
the backing rear surface was measured for the level line between the nasal and temporal heads.
2. Reasonably customizing a lens base curve:
1. conditions for customizing the base curve of the lens:
according to the practical operation experience in the glasses assembly, the base curve of the glasses needs to be customized, the difference between the radian of the glasses frame and the original design base curve of the glasses is often larger than 2D, and the position of the sharp edge is manually adjusted in the processing process, so that the processing and assembly requirements cannot be met.
2. Attention points of custom lens base curve:
when the requirement of processing and assembling is met by customizing the base curve of the lens, if the base curve of the lens is completely customized according to the radian of the groove of the lens holder, the design of the base curve of the lens is changed more, so that the lens is over-flat or over-curved in shape, and the imaging quality of the lens is reduced, and when the base curve is required to be customized, the original design base curve of the selected lens variety, particularly the lens with an aspheric design, is firstly known; the lens with the free-form surface design can be subjected to personalized design according to the selected base curve during vehicle room production of manufacturers, and the influence of the base curve change on the imaging of the lens is not required to be considered.
3. Method for determining optimal base curve:
when determining the base curve of the lens, the base curve is customized according to the luminosity of the lens to ensure that the curve of the lens frame is included between the front surface curve and the back surface curve of the lens, and the sharp edge and the groove position can be realized after processing: before myopia and after hyperopia, the best scheme is to customize the base curve.
3. When in full-frame and half-frame spectacle frames, the required base curve of the lens is calculated
After measuring the radian of the mirror circle, the base curve of the lens is determined by calculating according to the prescription luminosity.
Since the horizontal diameter of the rim is longer than the vertical diameter, the curvature is also most affected during assembly, and thus calculated as diopter in the horizontal direction.
1. Refractive index factor of the lens:
calculating the following steps:
the lens is diopter determined by two surfaces, one is a base curve surface and the other is a diopter surface, and because radians of a measuring instrument and a grinding die used by the lens are defined according to a refractive index of 1.523, the same diopter is different due to different refractive indexes, and the camber of the diopter surface is different:
(1) first, the formula is used:
(n=1.523, r1, r2 are radii of curvature)
Calculating the values of r1 and r2 when n=1.523
(2) The formula is introduced:(n is the refractive index of the selected lens)
The lens luminosity processed when the curvature radius of the two surfaces of the lens is unchanged is calculated, so that the change of the lens luminosity is processed due to the change of the refractive index when the curvature radius of the two surfaces of the lens is unchanged.
Example 1. When lens power-1D, base curve +6d, n=1.523, we get: front surface machining +6D, back surface machining-7D.
The calculation process comprises the following steps:
the formula is introduced:
example 2. When lens power-1D, base curve +6d, n=1.7. The method comprises the following steps: front surface machining +6D, back surface machining-7D.
The calculation process comprises the following steps:
the formula is introduced:
the conclusion is that when n=1.7, the front surface finish is +6d and the back surface finish is-7D, and the brightness of the processed lens is-1.25D, namely when n=1.7, the front surface finish is +6d and the back surface finish is-6.75D, and the lens with the brightness of-1D is obtained.
The method is as follows:
such as: basic bend +2D needs to be processed into-4D
1.523 bending/base bending surface +2D, processing the luminosity surface into-6D to obtain luminosity-4D;
when the bending surface is 1.7 turns/base bending surface +2D, the photometric surface is [ (4- (-4X 0.25) ] - (+2) = -5D)
That is to say, when the base curved surface is 1.7 fold/2D, the photometric surface is processed to be-5D, and the photometric-4D can be obtained.
2. Customizing a basic bending calculation formula:
E＝A+F/2
e, customizing a base curve A, namely the radian of a lens frame, wherein a near vision is positive, and a far vision is negative, namely F: and calculating the required processing luminosity according to the refractive index of the selected lens at the horizontal position of the lens.
Example: when n=1.523
Example 1: full frame, mirror frame radian +6D, lens processing luminosity-2D,
the method comprises the following steps of: and customizing the base curve +5D.
(1) And (3) calculating the base curve: +6+ (-2) 1/2= +5
(2) Interpretation: the front surface of the myopia lens is +5D, the rear surface is about-7D, 50% of the sharp edge is selected during processing, and the radian of the sharp edge after processing is about +6D.
Example 2: full frame, mirror frame radian-3D, lens processing luminosity +5D,
the method comprises the following steps of: base curve-0.5D (actually settable flat curve) is custom-made.
(1) And (3) calculating the base curve: -3+ (+5) 1/2= -0.5
(2) Interpretation: the rear surface of the far vision lens is flatly bent, the front surface is +5D, 50% of the sharp edge position is selected during processing, and the radian of the sharp edge after processing is about-3D.
When the second place, n=1.7, example 2: +5D/frame arc-3D
After the photometric surface is processed, the luminosity is +5- (+ 5X0.25) = +3.75D
The calculation is carried out according to the formula: -3+ (+3.75) 1/2≡1
Interpretation: the distance lens has a rear surface of-1D and a front surface of +4.75D, 60% of the sharp edge is selected during processing, the radian of the sharp edge after processing is about-3D, and the lens is thinner than the low-refraction lens.
4. Determination of base curve of lens with punching frame
1. Front pile head frame (suitable for myopia lens):
and (3) base bending customization: according to the measured values.
2. Rear pile head frame (fitting presbyopic lens):
and (3) base bending customization: according to the measured values.
5. Lens variety selection
1. Spherical lens: is suitable for the case of large change of base curve
Because the optical center area and the edge area of the lens have the same luminosity, the custom base curve is recommended to be used when the difference between the custom base curve and the original design is large.
2. Aspherical lens: suitable for small change of basal bending
The method has the advantages that the design of the original aspheric edge aberration is unchanged after the base curve is changed, and the influence on the edge aberration is larger after the base curve is changed.
When the change of the foundation bend is larger, the possibility that the preset foundation bend cannot be processed exists.
3. Free-form surface lens: note that the base curve is predetermined within the base curve range specified by the lens manufacturer.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. The method for measuring and calculating the base curve of the customized lens based on the mirror bracket is characterized by comprising the following steps of: the spectacle frame comprises a frame body and a lining clamped with the inner ring of the frame body, and the specific steps are as follows:
the staff fixedly installs the lining on the inner edge of the glasses frame, and then the radian value of the glasses frame is A by selecting the center position of the upper edge of the lining for measurement; the worker calculates the required machining luminosity as F according to the refractive index of the selected lens; then confirming a customized base curve E and a photometric surface curvature value G according to the machining luminosity F;
confirming a custom base curve E=F/2+A according to the machining luminosity F, wherein the rear luminosity surface curvature value G=F-E;
the method for calculating the required machining luminosity F according to the refractive index of the lens is that the radius of curvature of the lens is calculated according to the basic value of the refractive index of the lens and the initial luminosity F1;
the radii of curvature of the two faces of the lens are r1 and r2 respectively, the refractive index of the lens is n, and the basic value of n is 1.523, according to the following:and->The radius of curvature is calculated to be r1 and r2, and then the refractive index of the selected lens is substitutedAnd obtaining the actual processing luminosity.
2. The frame-based customized lens base curve measuring and calculating method according to claim 1, wherein: the lens is a near vision lens, F1 is the base curve value of the outer surface of the near vision lens, and F2 is the luminosity face value of the inner surface of the near vision lens.
3. The frame-based customized lens base curve measuring and calculating method according to claim 1, wherein: the lens is a presbyopic piece, F1 is the external power value of the presbyopic piece, and F2 is the base curve value of the internal surface of the presbyopic piece.
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| CN114647101B true CN114647101B (en) | 2023-11-14 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101317121A (en) * | 2005-11-29 | 2008-12-03 | 依视路国际集团（光学总公司） | Ophthalmic lens |
| CN101893768A (en) * | 2009-05-22 | 2010-11-24 | 宝利徕光学科技股份有限公司 | Prescription lens and method of making same |
| CN107170009A (en) * | 2017-04-28 | 2017-09-15 | 广州军区广州总医院 | A kind of curved data measuring method of goggles base based on medical image |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2911696B1 (en) * | 2007-01-24 | 2009-10-30 | Essilor Int | PROGRESSIVE OPHTHALMIC GLASS WITH PERSONALIZED INSET. |
| EP2028531B1 (en) * | 2007-12-28 | 2016-05-04 | Essilor International (Compagnie Generale D'optique) | Method of selecting a semi-finished ophthalmic lens according to a given spectacle frame |
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- 2022-03-22 CN CN202210282420.8A patent/CN114647101B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101317121A (en) * | 2005-11-29 | 2008-12-03 | 依视路国际集团（光学总公司） | Ophthalmic lens |
| CN101893768A (en) * | 2009-05-22 | 2010-11-24 | 宝利徕光学科技股份有限公司 | Prescription lens and method of making same |
| CN107170009A (en) * | 2017-04-28 | 2017-09-15 | 广州军区广州总医院 | A kind of curved data measuring method of goggles base based on medical image |
Non-Patent Citations (1)
| Title |
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| 个性化定制镜片的输入参数是如何影响镜片设计的;江苏天润光学镜片有限公司;中国眼镜科技杂志/天润自由曲面专栏(第15期);第92-93页 * |
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