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CN113465877A - Simple measuring device and method for refractive index of finished spectacle lens - Google Patents

Simple measuring device and method for refractive index of finished spectacle lens Download PDF

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Publication number
CN113465877A
CN113465877A CN202110353716.XA CN202110353716A CN113465877A CN 113465877 A CN113465877 A CN 113465877A CN 202110353716 A CN202110353716 A CN 202110353716A CN 113465877 A CN113465877 A CN 113465877A
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Prior art keywords
measuring
spectacle lens
finished spectacle
scale
refractive index
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Inventor
项华中
张露
李念宁
高健东
王成
郑刚
金涛
张大伟
庄松林
张佳康
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Priority to CN202110353716.XA priority Critical patent/CN113465877A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
    • G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
    • G01B5/213—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures for measuring radius of curvature

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Eyeglasses (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

The invention provides a simple measuring device and a method for measuring the refractive index of a finished spectacle lens, wherein the measuring device comprises a device body and a measuring component; the measuring component comprises a movable scale which is inserted into the device body through the scale fixing component, and the movable scale realizes vertical displacement relative to the fixing component; the bottom of the device body is preset with a through hole for arranging the mirror surface, and the head end of the movable scale is abutted against the bottom of the device body, so that the measuring device and the measuring method for rapidly and nondestructively measuring the refractive index of the finished spectacle lens are provided, wherein the measuring device is simple to operate.

Description

Simple measuring device and method for refractive index of finished spectacle lens
Technical Field
The invention relates to the technical field of glasses detection, in particular to a simple measuring device and a method for measuring the refractive index of a finished spectacle lens.
Background
The refractive index of the finished ophthalmic lens is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the finished ophthalmic lens material, reflecting the refractive power of the finished ophthalmic lens to light. Under the same material and condition, the higher the refractive index of the finished spectacle lens is, the thinner the finished spectacle lens is, and the lighter the quality is. However, the higher the refractive index of the finished spectacle lens, the better, and generally, the higher the refractive index of the finished spectacle lens, the lower the abbe number, and the more obvious the dispersion. Therefore, selecting a finished ophthalmic lens suitable for use by the wearer requires a measurement of the refractive index of the finished ophthalmic lens.
The current measuring device for finished spectacle lens mainly comprises a minimum deviation angle method, an Abbe refractometer critical angle method and a V-shaped prism method. These measuring devices not only require the de-filming of the finished ophthalmic lens, but also make the finished ophthalmic lens into a sample block, so that the finished ophthalmic lens is destroyed and cannot be reused.
Although there are many measuring devices for refractive index of finished spectacle lenses at home and abroad at present, and some of the devices are widely used in life, the existing methods all have certain defects, one of the methods calculates the numerical value of the refractive index by using a gauss-newton iteration method through constructing the relation between the reflection ratio and the refractive index, and the method is complex to operate and has great difficulty because a specific instrument is required to be used. Therefore, the method for researching the refractive index measurement of the finished lens under the conditions of no damage and high speed is the first problem to be solved in the design process.
Disclosure of Invention
The invention aims to provide a measuring device and a measuring method for quickly and nondestructively measuring the refractive index of a finished spectacle lens, which are simple to operate.
In order to achieve the above purpose, the invention provides a simple measuring device for refractive index of a finished spectacle lens, which comprises a device body and a measuring component;
the measuring component comprises a movable scale which is inserted into the device body through a scale fixing component, and the movable scale realizes vertical displacement relative to the fixing component;
The device comprises a device body and is characterized in that a through hole for arranging a mirror surface is preset at the bottom of the device body, and the head end of the movable scale is abutted against the bottom of the device body.
Further, the device body is a cylinder structure with upper and lower ends penetrating through, an upper end face through hole of the cylinder structure is used for setting the scale fixing assembly, and a lower end face through hole of the cylinder structure is used for placing a lens to be tested.
Furthermore, the scale fixing component is a fixing cover, the fixing cover is arranged on the upper end face of the device body in a covering mode, a groove hole is formed in the center of the fixing cover, the movable scale is inserted into the groove hole, and the movable scale is vertically displaced in the groove hole along the direction from the upper end face to the lower end face of the device body.
Furthermore, the measuring assembly also comprises a measuring scale which is movably connected with the scale fixing assembly, so that fine adjustment is convenient to realize; the side beam scale is close to the movable scale and arranged in parallel with the movable scale.
The invention also provides a method for measuring the refractive index of the finished spectacle lens, which comprises the following steps:
step 1: adjusting the position of the measuring scale to enable the measuring scale and the movable scale to return to zero;
Step 2: horizontally placing the front surface of the finished spectacle lens upwards in a measuring area, and aligning the side edge of the bottom of the device body with the upper extending edge of the finished spectacle lens;
and step 3: the convex part on the surface of the finished spectacle lens pushes the movable scale to move upwards, and after the movable scale stops moving, the difference between the movable scale and the measuring scale is read; the rise S of the surface of the finished spectacle lens is obtained1；
And 4, step 4: measuring the outer radius of the finished ophthalmic lens as y using a length measuring tool1Radius of curvature of anterior surface
Figure BDA0003002982030000031
And 5: horizontally placing the rear surface of the finished spectacle lens upwards in a measuring area, and aligning the side edge of the bottom of the device body with the upper extending edge of the finished spectacle lens;
step 6: pushing the movable scale to move downwards until the head end of the movable scale is abutted against the surface of the finished spectacle lens; reading a difference between the moving scale and the measurement scale; the rise S of the surface of the finished spectacle lens is obtained2；
And 7: measuring the inner radius of the finished ophthalmic lens as y using a length measuring tool2Radius of curvature of rear surface
Figure BDA0003002982030000032
And 8: the refractive power F of the finished spectacle lens is measured by a lensometer, and the front surface refractive power is F1Refractive power of posterior surface F 2The finished ophthalmic lens refractive power is expressed as: f ═ F1+F2；
And step 9: calculating the front surface refractive power F of the finished ophthalmic lens1Front surface radius of curvature r1And a refractive index n2The relationship between is
Figure BDA0003002982030000033
Refractive index n of air1Is 1, i.e.
Figure BDA0003002982030000034
Step 10:calculating the back surface refractive power F of the finished ophthalmic lens2Rear surface radius of curvature r2And refractive index n2The relationship between is
Figure BDA0003002982030000035
Refractive index n of air1Is 1, i.e.
Figure BDA0003002982030000036
Step 11: substituting the equations of step 9 and step 10 into F ═ F in step 81+F2In (1) obtaining
Figure BDA0003002982030000037
Calculating the refractive index after deformation
Figure BDA0003002982030000038
Further, in step 4, the measurement yields the front surface rise S of the finished ophthalmic lens1Using a length measuring tool to measure the outer radius of the finished ophthalmic lens as y1According to the Pythagorean theorem
Figure BDA0003002982030000041
I.e. front surface radius of curvature
Figure BDA0003002982030000042
Further, in step 7, the finished ophthalmic lens back surface rise is S2Using a length measuring tool to measure the inner radius of the finished ophthalmic lens as y2According to the Pythagorean theorem
Figure BDA0003002982030000043
I.e. radius of curvature of the back surface
Figure BDA0003002982030000044
Compared with the prior art, the invention has the advantages that: the device has simple structure, can measure the rise of the outer surface and the rise of the inner surface of the finished spectacle lens by measuring the reading between the scale and the movable scale, and can obtain the curvature radius of the rear surface and the curvature radius of the front surface by combining the refractive index measuring method of the finished spectacle lens. The measuring device is simple, is suitable for various places, can realize quick and nondestructive measurement, and is convenient for factory mass production.
Drawings
FIG. 1 is a schematic view of the overall structure of a simple apparatus for measuring the refractive index of a finished spectacle lens according to an embodiment of the present invention;
FIG. 2 is a schematic view of a finished ophthalmic lens outer surface rise measurement in an embodiment of the present invention;
FIG. 3 is a schematic representation of a finished ophthalmic lens inner surface rise measurement in an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be further described below.
As shown in FIG. 1, the invention provides a simple measuring device for refractive index of a finished spectacle lens, comprising a device body 1 and a measuring component;
the measuring component comprises a movable scale 2, the movable scale 2 is inserted into the device body 1 through a scale fixing component 3, and the movable scale 2 realizes vertical displacement relative to the fixing component 3;
the bottom of the device body 1 is preset with a through hole for arranging a mirror surface, and the head end 5 of the movable scale 2 is abutted against the bottom of the device body 1.
In this embodiment, the device body 1 is the cylinder structure that both ends run through from top to bottom, and the up end through-hole of cylinder structure is used for setting up the fixed subassembly 3 of scale, and the lower terminal surface through-hole of cylinder structure is used for placing the lens that awaits measuring.
In this embodiment, the scale fixing component 3 is a fixing cover, the fixing cover is arranged on the upper end face of the device body 1, a slotted hole is formed in the center of the fixing cover, the movable scale 2 is inserted into the slotted hole, and the movable scale 2 is vertically displaced in the slotted hole along the direction from the upper end face to the lower end face of the device body 1.
In this embodiment, the measuring assembly further includes a measuring scale 4, and the measuring scale 4 is movably connected with the scale fixing assembly 3, so as to facilitate fine adjustment; the side beam scale is close to the moving scale 2 and arranged in parallel with the moving scale 2.
The invention also provides a method for measuring the refractive index of the finished spectacle lens, which comprises the following steps:
step 1: adjusting the position of the measuring scale 4 to enable the measuring scale 4 and the movable scale 2 to return to zero;
step 2: horizontally placing the front surface of the finished spectacle lens upwards in a measuring area, and aligning the side edge of the bottom of the device body 1 with the upper extending edge of the finished spectacle lens;
and step 3: the convex part on the surface of the finished spectacle lens pushes the movable scale 2 to move upwards, and after the movable scale 2 stops moving, the difference between the movable scale 2 and the measuring scale 4 is read; namely the surface vector height S of the finished spectacle lens1；
And 4, step 4: as shown in FIG. 2, the outer radius of the finished ophthalmic lens 6 is measured as y using a length measuring tool1Radius of curvature of anterior surface
Figure BDA0003002982030000051
Measuring to obtain the rise S of the front surface of the finished spectacle lens1Measuring the outer radius of the finished ophthalmic lens as y using a length measuring tool1According to the Pythagorean theorem
Figure BDA0003002982030000061
I.e. front surface radius of curvature
Figure BDA0003002982030000062
And 5: horizontally placing the rear surface of the finished spectacle lens upwards in a measuring area, and aligning the side edge of the bottom of the device body 1 with the upper extending edge of the finished spectacle lens;
Step 6: pushing the movable scale 2 to move downwards until the head end of the movable scale 2 is abutted against the surface of the finished spectacle lens; reading the difference between the moving scale 2 and the measuring scale 4; the finished spectacle lens is obtainedSurface vector height S2；
And 7: as shown in FIG. 3, the inner radius of the finished ophthalmic lens 6 is measured as y using a length measuring tool2Radius of curvature of rear surface
Figure RE-GDA0003246270120000063
The rise of the rear surface of the finished spectacle lens is S2Using a length measuring tool to measure the inner radius of the finished ophthalmic lens as y2According to the Pythagorean theorem
Figure BDA0003002982030000064
I.e. radius of curvature of the back surface
Figure BDA0003002982030000065
And 8: the refractive power F of the finished spectacle lens is measured by a lensometer, and the front surface refractive power is F1Refractive power of posterior surface F2The finished ophthalmic lens refractive power is expressed as: f ═ F1+F2；
And step 9: calculating the front surface refractive power F of the finished spectacle lens1Front surface radius of curvature r1And refractive index n2The relationship therebetween is
Figure BDA0003002982030000066
Refractive index n of air1Is 1, i.e.
Figure BDA0003002982030000067
Step 10: calculating the back surface refractive power F of the finished ophthalmic lens2Rear surface radius of curvature r2And refractive index n2The relationship between is
Figure BDA0003002982030000068
Refractive index n of air1Is 1, i.e.
Figure BDA0003002982030000069
Step 11: substituting the equations of step 9 and step 10 into F ═ F in step 81+F2In (1) obtaining
Figure BDA00030029820300000610
Calculating the refractive index after deformation
Figure BDA00030029820300000611
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1.一种成品眼镜片折射率简易测量装置，其特征在于，包括装置本体和测量组件；1. a simple measuring device for the refractive index of finished spectacle lenses, characterized in that, comprising a device body and a measuring assembly; 所述测量组件包括一根移动标尺，所述移动标尺通过标尺固定组件插接于所述装置本体内，并且所述移动标尺实现相对所述固定组件的竖直位移；The measuring assembly includes a moving ruler, the moving ruler is inserted into the device body through the ruler fixing assembly, and the moving ruler realizes a vertical displacement relative to the fixing assembly; 所述装置本体的底部预设有安置镜面的通孔，所述移动标尺的首端抵触于所述装置本体的底部。The bottom of the device body is preset with a through hole for arranging the mirror surface, and the head end of the moving scale abuts against the bottom of the device body. 2.根据权利要求1所述的成品眼镜片折射率简易测量装置，其特征在于，所述装置本体为上下两端贯穿的圆柱体结构，所述圆柱体结构的上端面通孔用于设置所述标尺固定组件，所述圆柱体结构的下端面通孔用于放置待测镜片。2 . The simple refractive index measurement device for finished spectacle lenses according to claim 1 , wherein the device body is a cylindrical structure that penetrates through the upper and lower ends, and the through holes on the upper end face of the cylindrical structure are used to set the In the scale fixing component, the through hole on the lower end face of the cylindrical structure is used for placing the lens to be tested. 3.根据权利要求1所述的成品眼镜片折射率简易测量装置，其特征在于，所述标尺固定组件为一个固定盖，所述固定盖盖设于所述装置本体的上端面，所述固定盖的中心位置设有一个槽孔，所述移动标尺插接于所述槽孔内，所述移动标尺在所述槽孔内实现沿所述装置本体上端面至下端面方向的竖直位移。3 . The simple refractive index measurement device for finished spectacle lenses according to claim 1 , wherein the scale fixing component is a fixing cover, the fixing cover is covered on the upper end face of the device body, and the fixing The center of the cover is provided with a slot hole, and the moving scale is inserted into the slot hole, and the moving scale realizes vertical displacement along the direction from the upper end face to the lower end face of the device body in the slot hole. 4.根据权利要求1所述的成品眼镜片折射率简易测量装置，其特征在于，所述测量组件还包括一根测量标尺，所述测量标尺与所述标尺固定组件活动连接，便于实现微调；所述侧梁标尺靠近所述移动标尺且与所述移动标尺平行布置。4. The simple measuring device for the refractive index of finished spectacle lenses according to claim 1, wherein the measuring assembly further comprises a measuring scale, and the measuring scale is movably connected with the scale fixing assembly, so as to facilitate fine-tuning; The side beam scale is disposed adjacent to and parallel to the moving scale. 5.一种成品眼镜片折射率测量方法，使用如权利要求1-4中任意一项所述的成品眼镜片折射率简易测量装置，其特征在于，包括以下步骤：5. A method for measuring the refractive index of a finished spectacle lens, using the simple measuring device for the refractive index of a finished spectacle lens as described in any one of claims 1-4, wherein the method comprises the following steps: 步骤1：调整测量标尺的位置，使得测量标尺与移动标尺实现归零；Step 1: Adjust the position of the measuring ruler so that the measuring ruler and the moving ruler can be reset to zero; 步骤2：将成品眼镜片前表面向上水平放置于测量区，将装置本体底部侧沿与所述成品眼镜片的上延边对齐；Step 2: place the front surface of the finished spectacle lens upward and horizontally in the measurement area, and align the bottom side edge of the device body with the upper extending edge of the finished spectacle lens; 步骤3：所述成品眼镜片表面凸起部分推动所述移动标尺向上位移，所述移动标尺停止移动后，读取所述移动标尺与测量标尺之间的差值；即为成品眼镜片表面矢高S1；Step 3: The convex part on the surface of the finished spectacle lens pushes the moving scale to move upward, and after the moving scale stops moving, read the difference between the moving scale and the measuring scale; that is, the surface sag of the finished spectacle lens S 1 ; 步骤4：使用测量长度工具测得成品眼镜片的外部半径为y1，则前表面曲率半径
Figure FDA0003002982020000021
Step 4: Use the measuring length tool to measure the outer radius of the finished spectacle lens as y 1 , then the front surface curvature radius
Figure FDA0003002982020000021
 步骤5：将所述成品眼镜片后表面向上水平放置于测量区，将装置本体底部侧沿与所述成品眼镜片的上延边对齐；Step 5: Place the rear surface of the finished spectacle lens upward and horizontally in the measurement area, and align the bottom side edge of the device body with the upper extension of the finished spectacle lens; 步骤6：推动所述移动标尺向下移动，直至所述移动标尺的首端抵触于所述成品眼镜片的表面；读取所述移动标尺与测量标尺之间的差值；即为成品眼镜片表面矢高S2；Step 6: Push the moving scale down until the head end of the moving scale abuts on the surface of the finished spectacle lens; read the difference between the moving scale and the measuring scale; that is, the finished spectacle lens surface sag S 2 ; 步骤7：使用测量长度工具测得成品眼镜片的内部半径为y2，则后表面曲率半径
Figure FDA0003002982020000022
Step 7: Use the measuring length tool to measure the inner radius of the finished spectacle lens as y 2 , then the radius of curvature of the rear surface
Figure FDA0003002982020000022
 步骤8：使用焦度计测得成品眼镜片屈光力F，前表面屈光力为F1，后表面屈光力为F2，成品眼镜片屈光力表示为：F＝F1+F2；Step 8: Using a diopter to measure the refractive power F of the finished spectacle lens, the refractive power of the front surface is F 1 , the refractive power of the rear surface is F 2 , and the refractive power of the finished spectacle lens is expressed as: F=F 1 +F 2 ; 步骤9：计算所述成品眼镜片前表面屈光力F1、前表面曲率半径为r1和折射率n2之间的关系为
Figure FDA0003002982020000023
空气的折射率n1为1，即
Figure FDA0003002982020000024
Step 9: Calculate the relationship between the front surface refractive power F 1 of the finished spectacle lens, the front surface curvature radius r 1 and the refractive index n 2 as follows:
Figure FDA0003002982020000023
The refractive index n of air is 1 , i.e.
Figure FDA0003002982020000024
 步骤10：计算所述成品眼镜片后表面屈光力F2、后表面曲率半径为r2和折射率n2之间的关系为
Figure FDA0003002982020000025
空气的折射率n1为1，即
Figure FDA0003002982020000026
Step 10: Calculate the relationship between the rear surface refractive power F 2 of the finished spectacle lens, the rear surface curvature radius r 2 and the refractive index n 2 as follows:
Figure FDA0003002982020000025
The refractive index n of air is 1 , i.e.
Figure FDA0003002982020000026
 步骤11：将步骤9和步骤10的公式代入步骤8的F＝F1+F2中，得到
Figure FDA0003002982020000027
变形后计算得到折射率
Figure FDA0003002982020000028
Step 11: Substitute the formulas of Step 9 and Step 10 into F=F 1 +F 2 of Step 8, and get
Figure FDA0003002982020000027
Refractive index calculated after deformation
Figure FDA0003002982020000028
 6.根据权利要求5所述的成品眼镜片折射率测量方法，其特征在于，在步骤4中，测量得到成品眼镜片前表面矢高S1，使用测量长度工具测得成品眼镜片的外部半径为y1，根据勾股定理可得
Figure FDA0003002982020000031
即前表面曲率半径
Figure FDA0003002982020000032
6. The method for measuring the refractive index of finished spectacle lenses according to claim 5, characterized in that, in step 4, the front surface sag S 1 of the finished spectacle lens is measured, and the outer radius of the finished spectacle lens is measured using a measuring length tool as y 1 , according to the Pythagorean theorem, we can get
Figure FDA0003002982020000031
the radius of curvature of the front surface
Figure FDA0003002982020000032
 7.根据权利要求5所述的成品眼镜片折射率测量方法，其特征在于，在步骤7中，成品眼镜片后表面矢高为S2，使用测量长度工具测得成品眼镜片的内部半径为y2，根据勾股定理可得
Figure FDA0003002982020000033
即后表面曲率半径
Figure FDA0003002982020000034
7. The method for measuring the refractive index of a finished spectacle lens according to claim 5, wherein in step 7, the back surface sag of the finished spectacle lens is S 2 , and the inner radius of the finished spectacle lens measured using a measuring length tool is y 2 , according to the Pythagorean theorem, we can get
Figure FDA0003002982020000033
the radius of curvature of the rear surface
Figure FDA0003002982020000034
CN202110353716.XA 2021-04-01 2021-04-01 Simple measuring device and method for refractive index of finished spectacle lens Pending CN113465877A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2233084Y (en) * 1994-10-28 1996-08-14 马振亚 Lensometer checking lens
CN204461716U (en) * 2015-03-06 2015-07-08 桂林市锦鹏电子有限公司 A kind of digital display mirror degree table

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2233084Y (en) * 1994-10-28 1996-08-14 马振亚 Lensometer checking lens
CN204461716U (en) * 2015-03-06 2015-07-08 桂林市锦鹏电子有限公司 A kind of digital display mirror degree table

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
马会防: "镜片折射率的简易测量方法", 《中国眼镜科技杂质》, no. 11, 21 April 2012 (2012-04-21), pages 134 - 135 *

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