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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China
Prior art keywords
measuring
scale
finished
spectacle lens
refractive index
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CN202110353716.XA
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Chinese (zh)
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. The simple measuring device for the refractive index of the finished spectacle lens is characterized by comprising a device body and a measuring assembly;
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.
2. The simple measuring device for refractive index of finished spectacle lens according to claim 1, wherein the device body is a cylinder structure with upper and lower ends penetrating through, the through hole on the upper end surface of the cylinder structure is used for arranging the ruler fixing component, and the through hole on the lower end surface of the cylinder structure is used for placing the lens to be measured.
3. The simple measuring device for refractive index of finished spectacle lens as claimed in 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, a slot is formed in the center of the fixing cover, the movable scale is inserted into the slot, and the movable scale is vertically displaced in the slot along the direction from the upper end face to the lower end face of the device body.
4. The simple finished product spectacle lens refractive index measuring device 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 adjustment; the side beam scale is close to the movable scale and arranged in parallel with the movable scale.
5. A method for measuring refractive index of a finished spectacle lens, which uses the simple device for measuring refractive index of a finished spectacle lens according to any one of claims 1 to 4, comprising the steps of:
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 FDA0003002982020000021
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 abuttedOn 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 FDA0003002982020000022
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 ophthalmic lens1Front surface radius of curvature r 1And refractive index n2The relationship between is
Figure FDA0003002982020000023
Refractive index n of air1Is 1, i.e.
Figure FDA0003002982020000024
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 FDA0003002982020000025
Refractive index n of air1Is 1, i.e.
Figure FDA0003002982020000026
Step 11: substituting the equations of step 9 and step 10 into F ═ F in step 81+F2In (1) obtaining
Figure FDA0003002982020000027
Calculating the refractive index after deformation
Figure FDA0003002982020000028
6. The refractive index measurement method of a finished spectacle lens as claimed in claim 5, wherein in step 4, the measurement yields a front surface rise S of the finished spectacle lens1Using a length measuring tool to measure the outer radius of the finished ophthalmic lens as y1According to the Pythagorean theorem
Figure FDA0003002982020000031
I.e. front surface radius of curvature
Figure FDA0003002982020000032
7. The finished ophthalmic lens refractive index measurement method of claim 5, wherein 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 FDA0003002982020000033
I.e. radius of curvature of the back 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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CN202110353716.XA CN113465877A (en) 2021-04-01 2021-04-01 Simple measuring device and method for refractive index of finished spectacle lens

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Application Number Priority Date Filing Date Title
CN202110353716.XA CN113465877A (en) 2021-04-01 2021-04-01 Simple measuring device and method for refractive index of finished spectacle lens

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Publication Number Publication Date
CN113465877A true CN113465877A (en) 2021-10-01

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