CN114046730A - Optical lens auxiliary jig and method for measuring surface type precision and R value deviation thereof - Google Patents
Optical lens auxiliary jig and method for measuring surface type precision and R value deviation thereof Download PDFInfo
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- CN114046730A CN114046730A CN202111271706.8A CN202111271706A CN114046730A CN 114046730 A CN114046730 A CN 114046730A CN 202111271706 A CN202111271706 A CN 202111271706A CN 114046730 A CN114046730 A CN 114046730A
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- lens
- auxiliary jig
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2441—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures using interferometry
Abstract
The invention discloses an auxiliary jig for measuring the surface type of an optical lens, which is in a bowl shape with a hollow bottom; the auxiliary jig is fixed above the interferometer lens through a hole-shaped bracket; the bottom of the auxiliary jig is formed by alternately arranging hollow areas and non-hollow areas, and the diameter of an integral gap formed by a plurality of hollow areas at the bottom of the auxiliary jig is larger than that of the lens to be measured; and supporting points are arranged on the non-hollowed-out areas between the adjacent hollowed-out areas, and the lens to be measured is placed on the supporting points. The invention also discloses a method for measuring the surface type precision and the R value deviation of the auxiliary jig. The auxiliary jig for measuring the surface shape of the optical lens can adapt to the measurement of the surface shape of batch lens finished products with different diameters within a certain diameter range, the jig does not need to be frequently disassembled and the distance between the center of the auxiliary jig for holding the lens and the lens of the interferometer does not need to be repeatedly adjusted for the lenses with different diameters, the auxiliary jig is in point contact with the lens, and even if the specific contact position changes slightly, the problem that the number of fringes of the interferometer is different in multiple measurements of the lenses with the same batch and the same specification does not occur, so that the accurate and continuous measurement of the surface shape of the lens and the deviation of the R value are realized.
Description
Technical Field
The invention relates to an auxiliary jig for measuring the surface type of an optical lens, and also relates to a method for measuring the surface type precision and R value deviation of the auxiliary jig.
Background
In the optical spherical lens processing process, a special vertical laser interferometer is adopted for the lens surface type to measure the surface type, wherein a special auxiliary jig is needed during measurement and used for supporting the lens to be stabilized at a certain distance above the interferometer lens, so that laser emission light rays can conveniently pass through the interferometer lens from bottom to top and pass through a gap of the auxiliary jig, the whole effective surface of the lens is vertically irradiated, then the laser is reflected by the surface to be measured of the lens, the light rays return to the instrument along the way and then form a stable and complete screen interference fringe image through the instrument, according to the curvature of interference fringes, the accuracy of the lens surface type can be conveniently identified by human eyes, and according to the number of the fringes of the interferometer, the R value deviation of the lens can be conveniently identified by the human eyes. At present, the requirements of lenses with different diameters are met by designing various circular hole jigs, wherein the diameter of a hole is larger than the effective diameter of a measured surface of the lens but smaller than the diameter of the lens, so that the lenses with different diameters can be measured by the jigs with a plurality of specifications, resources are wasted, more importantly, the jigs with different specifications need to be frequently disassembled, the center of the auxiliary jig for the lens and the distance between the auxiliary jig for the lens and a lens of an interferometer are repeatedly adjusted to obtain fringe images which are easily recognized by human eyes, a large amount of time is wasted, the contact between a curvature surface of the lens and the edge of the hole part of the auxiliary jig is surface contact, the specific contact position is slightly changed every time, different times of measurement on the lens with the same specification are caused, the number of fringes of the interferometer is changed, the R value deviation of the lens cannot be accurately estimated, and in the large-batch detection of the lenses, individual products with the exceeding the R value of the lens cannot be recognized, causing poor outflow of the product. Meanwhile, the measured surface of the lens is in surface contact with the edge of the hole part of the jig, the measurement position can be slightly changed every time, so that the fringe number of the interferometer is irregularly changed, the eye identification is difficult, the relevant auxiliary jig parameters need to be readjusted, and the fringe number image which can be easily identified by human eyes is obtained, so that the surface type of the batch lens to be detected and whether the R value is deviated can not be rapidly and continuously measured.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an auxiliary jig which can accurately and continuously measure the surface type of a lens and the R value deviation, and the invention also aims to provide a method for measuring the surface type accuracy and the R value deviation of the auxiliary jig.
The technical scheme is as follows: the auxiliary jig for measuring the optical lens surface shape is in a bowl shape with a hollow bottom; the auxiliary jig is fixed above the interferometer lens through a hole-shaped bracket; the bottom of the auxiliary jig is formed by alternately arranging hollow areas and non-hollow areas, and the diameter of an integral gap formed by a plurality of hollow areas at the bottom of the auxiliary jig is larger than that of the lens to be measured; and supporting points are arranged on the non-hollowed-out areas between the adjacent hollowed-out areas, and the lens to be measured is placed on the supporting points.
And the vertical distance between the auxiliary jig and the interferometer lens is adjusted through the hole-type bracket.
The bowl-shaped auxiliary jig is used as an axis, and the plurality of hollow areas are uniformly distributed on the periphery of the center line.
The number of the hollow areas is three, and the hollow areas are fan-shaped; the included angle of the central lines of the adjacent sector areas is 120 degrees.
The inner diameter of the auxiliary jig is gradually decreased from top to bottom, when the lens to be measured is a convex lens, the bottom of the auxiliary jig is arranged on the hole-shaped bracket, the non-hollowed-out area between every two adjacent hollowed-out areas is provided with a front end protruding upwards, and the included angle between the upward protrusion and the side connecting wall is 115-120 degrees; the lens to be tested is placed at the upward bulge of each non-hollow area. The upward bulge and the side connecting wall are arranged at a certain included angle so as to adapt to the lens with a wider diameter range.
Wherein, three upward protruding all are smooth sharp point, and the three upward protruding vertical height apart from the bowl bottom is unanimous, and the line of three upward protruding in coplanar forms equilateral triangle.
The inner diameter of the auxiliary jig is gradually decreased from top to bottom, when the lens to be measured is a concave lens, the top of the auxiliary jig is arranged on the hole-shaped bracket, the non-hollowed-out areas between the adjacent hollowed-out areas are provided with front ends protruding downwards, the included angle between the downward protrusion and the side connecting wall is 0 degree, and the lens to be measured is arranged at the downward protrusion position of each non-hollowed-out area.
Wherein, three downward bulges are smooth sharp points, the vertical heights of the three downward bulges from the bottom of the bowl are consistent, and the connecting lines of the three downward bulges in the same plane form an equilateral triangle.
The method for measuring the surface type precision of the optical lens based on the auxiliary jig specifically comprises the following steps: the auxiliary jig is arranged above the interferometer lens through the hole type bracket, the measured surface of the lens to be measured is placed on a supporting point of the auxiliary jig, the position of the auxiliary jig is adjusted through the hole type bracket, so that the center of the measured surface of the lens to be measured is aligned with the center of the interferometer lens, the distance between the auxiliary jig and the interferometer lens is adjusted through the hole type bracket, the condition of an imaging image on a screen is observed, the measured surface of the lens to be measured and the center position and the relative distance between the measured surface of the interferometer lens are changed until the number of interferometer stripes on the screen is easily recognized by human eyes, and the accuracy of the surface type of the lens is recognized by the human eyes according to the curvature of the interferometer stripes.
The method for measuring the R value deviation of the optical lens based on the auxiliary jig specifically comprises the following steps: the batch of lens finished products to be inspected are set as follows: a lens with R value of C and tolerance of D; taking a lens III with the R value of C as a standard component, taking the tolerance upper limit + D of the R value of C as a lens I, and taking the tolerance lower limit-D of the R value of C as a lens II; the method comprises the steps of firstly placing a lens III on an auxiliary jig, changing the central position and the relative distance between a measured surface of the lens III and a lens of an interferometer until the number of interferometer fringes on a screen is a value A which can be recognized by naked eyes, then placing a lens I and a lens II on the auxiliary jig respectively, wherein the position of the auxiliary jig does not need to be adjusted, and the number of the interference fringes obtained by the lens I and the lens II is B; finally, sequentially placing the finished lens to be inspected on an auxiliary jig, and if the number of the interference fringes of the corresponding lens is greater than B, determining that the R value deviation of the lens exceeds the allowable tolerance range; if the number of the interference fringes of the corresponding lens is between A and B, the R value of the lens is determined not to exceed the allowable tolerance range, and the requirement is met. According to the number of the fringes of the interferometer, the method is convenient for human eyes to quickly identify whether the R value of the lens is deviated or not, and further, the good product and the defective product of the R value of the lens are quickly distinguished.
Has the advantages that: the auxiliary jig for measuring the surface shape of the optical lens can adapt to the measurement of the surface shape of batch lens finished products with different diameters within a certain diameter range, the jig does not need to be frequently disassembled and the distance between the center of the auxiliary jig for holding the lens and the lens of the interferometer does not need to be repeatedly adjusted for the lenses with different diameters, the auxiliary jig is in point contact with the lens, and even if the specific contact position changes slightly, the problem that the number of fringes of the interferometer is different in multiple measurements of the lenses with the same batch and the same specification does not occur, so that the accurate and continuous measurement of the surface shape of the lens and the deviation of the R value are realized.
Drawings
FIG. 1 is a side view of the auxiliary fixture of the present invention when the lens to be measured is a convex lens;
FIG. 2 is a top view of the auxiliary fixture of the present invention when the lens to be measured is a convex lens;
FIG. 3 is a schematic view of the auxiliary fixture of the present invention being placed on the lens of the interferometer when the lens to be measured is a convex lens;
FIG. 4 is a graph of interference fringes produced when measuring a convex lens;
FIG. 5 is a side view of the auxiliary fixture of the present invention when the lens to be measured is a concave lens;
FIG. 6 is a top view of the auxiliary fixture of the present invention when the lens to be measured is a concave lens;
fig. 7 is a diagram of interference fringes produced when measuring a concave lens.
Detailed Description
As shown in fig. 1 to 6, in the auxiliary fixture for measuring the surface type of an optical lens according to the present invention, the auxiliary fixture 5 is a bowl-shaped fixture with a hollow bottom, the bowl-shaped thin-walled cylindrical auxiliary fixture 5 is made of baisai steel or metal, and the inner diameter of the auxiliary fixture 5 is gradually decreased from top to bottom; the auxiliary fixture 5 is fixed above the interferometer lens 12 through a hole-type bracket, the vertical distance between the auxiliary fixture 5 and the interferometer lens 12 can be adjusted through the hole-type bracket, and the central position of the auxiliary fixture 5 relative to the interferometer lens 12 can also be adjusted through the hole-type bracket; the interferometer lens 12 comprises a high-precision glass lens 17 with a specific curvature and a specific size, and the high-precision glass lens 17 is fixed in a metal cylindrical shell 18; the bottom of the auxiliary jig 5 is formed by alternately arranging hollow areas 6 and non-hollow areas 13, and the diameter of an overall gap formed by the three hollow areas 6 at the bottom of the auxiliary jig 5 is larger than that of the lens 4 to be measured; the non-hollow areas 13 between adjacent hollow areas have supporting points 14, and the lens 4 to be measured is placed on the supporting points 14. The support points 14 are smooth sharp points.
The number of the hollow areas 6 is three, the central line of the bowl-shaped auxiliary jig 5 is taken as an axis, and the three hollow areas 6 are uniformly distributed on the periphery of the central line; the hollow areas 6 are in the shape of sectors, and the included angle of the central lines of the adjacent sector areas is 120 degrees. The non-hollowed-out areas 13 between the adjacent hollowed-out areas 6 are provided with front ends (15, 16) with smooth sharp points, so that three symmetrical smooth sharp points 14 (burr-free and smooth contact round points) are constructed on the central plane of the bottom of the bowl of the auxiliary jig 5, the vertical heights of the three sharp points 14 from the bottom of the bowl are consistent, the connecting lines of the three sharp points 14 in the same plane form an equilateral triangle, the auxiliary jig 5 accurately positions the central position of the lens 4 to be measured placed on the auxiliary jig 5 through the three sharp points 14, and the distance between the measured surface of the lens 4 and the interferometer lens 12 can be accurately adjusted through the connection between the auxiliary jig 5 and the interferometer bracket. The diameter of a gap part formed by the three fan-shaped hollow areas 6 at the bottom of the auxiliary jig 5 is larger than that of the lens 4, so that laser can irradiate the whole measured surface of the lens without being shielded and returns to the interferometer along the way.
The bowl wall of auxiliary tool 5 upper end is outer along and bowl bottom between be connected wall 20 part and can utilize the difference of angle, change the size of auxiliary tool 5 upper end bowl footpath, when lens 4 that awaits measuring is convex lens, when auxiliary tool 5 moves down, this auxiliary tool 5 bowl wall 20 can contact with the interior edge of interferometer camera lens 12 cylindrical shell 18, produce and block the effect, and then make auxiliary tool 5 bowl bottom and camera lens part have the clearance of certain distance, play auxiliary tool 5 bowl bottom and can not touch the camera lens, reach the guard action. That is, the bowl wall of the auxiliary fixture 5 is partially contacted with the inner edge of the cylindrical shell 17 of the interferometer lens 12 when moving downwards to a certain distance, so as to prevent the bottom of the bowl of the auxiliary fixture 5 from contacting with the lens 18 of the interferometer lens 12, thereby playing a role of collision avoidance.
When the lens 4 to be measured is the convex lens 10 made of glass material, the bottom of the auxiliary jig 5 is placed on the hole-shaped bracket, the non-hollowed-out area 13 between the adjacent hollowed-out areas 6 is provided with the front end of an upward bulge 15, and the included angle a between the upward bulge 15 and the side connecting wall 20 (bowl wall) is 115-120 degrees; the lens 4 to be tested is placed at the upward bulge 15 of each non-hollowed-out area 13.
When the lens 4 to be measured is the concave lens 19 made of glass material, the top of the auxiliary jig 5 is placed on the hole-shaped bracket, the non-hollowed-out areas 13 between the adjacent hollowed-out areas 6 are provided with the front ends of the downward bulges 16, the included angle between the downward bulges 16 and the side connecting wall 20 (bowl wall) is 0 degree, and the lens 4 to be measured is placed at the downward bulges 16 of each non-hollowed-out area 13.
The auxiliary fixture 5 is provided with three fan-shaped hollows on the central surface of the bowl bottom, the diameter of a gap part formed by the three fan-shaped hollows is larger than that of the lens, laser can penetrate through the hollow gap part and vertically irradiate the whole effective measured surface of the lens and returns to an instrument along the way to form a complete lens interference fringe image, therefore, the measuring of the tool to the lens with different diameters in a certain range can be realized, three sharp points of the auxiliary tool 5 and the bowl wall connected with the three sharp points can shield a part of laser light so as not to be completely irradiated on the measured surface of the lens, thereby leading the shadow part 9 to appear on the fringe screen of the interferometer, as the shadow area is limited, the identification of human eyes is not difficult, and as shown in fig. 4 and 7, an interference fringe image 7 generated by a convex lens is measured on a screen 8, and comprises the number of fringes which can be identified by human eyes, the curvature, and three symmetrical shadow images 9 formed on the screen by the bowl wall part of the auxiliary fixture 5 blocking laser.
The method for measuring the surface type precision of the optical lens based on the auxiliary jig specifically comprises the following steps: selecting an interferometer lens 12 with a proper specification according to the R value of the batch of lenses to be measured, installing the interferometer lens at the bottom of the interferometer, turning on a power supply on the interferometer, starting laser on the interferometer to work at the moment, irradiating the lens by the laser, generating a lens center position image on an imaging screen, and adjusting the lens center position to enable a point image generated by the interferometer lens on the screen to be in a positive center position; mounting the manufactured auxiliary fixture 5 on a hole-shaped bracket at the upper part of an interferometer lens 12, screwing the auxiliary fixture 5 and the hole-shaped bracket by hands to connect, opening laser on a laser interferometer, placing the curvature surface to be measured of the lens on three smooth sharp points 14 of the auxiliary fixture 5 in a positive mode, then adjusting the position of the auxiliary fixture 5 relative to the interferometer lens 12 according to the image of the interference fringes of the lens on the interferometer, namely, aligning the positive center of the lens 4 to be measured with the positive center of the interferometer lens 12, observing the condition of an imaging image on a screen, repeatedly adjusting the central position and the relative distance of the auxiliary fixture 5 relative to the interferometer lens 12, namely, changing the central position and the relative distance of the measured surface of the lens and the interferometer lens 12 until the number of the interference fringes on the screen can be easily recognized by human eyes (generally 0-4 fringes), according to the curvature of the interference fringes, the accuracy of the lens surface type can be conveniently identified by human eyes.
Firstly, the three smooth sharp points 14 at the bottom of the bowl of the auxiliary fixture 5 and other parts are of an integral structure, the positions of the three smooth sharp points are stable, reliable, the connection part with the interferometer bracket is also stable and reliable, the lens is put on the interferometer bracket without any change from all external factors influencing the interferometer fringes during the last measurement, therefore, the interference fringe image presented by the screen is the real reaction of the lens surface type and the deviation of the R value, after the number of the interference fringes of the standard component is adjusted, the R value of the lens does not change, the number of fringes of the interferometer does not change, the R value of the lens also changes, the number of fringes of the interferometer also changes correspondingly, namely, when the absolute value of the R value of the lens deviates from the set R value, the number of fringes of the interferometer increases, and conversely, whether the R value of the lens is deviated or not can be determined by observing how much the number of fringes of the interferometer varies.
The method for measuring the R value deviation of the optical lens based on the auxiliary jig specifically comprises the following steps: the batch of lens finished products to be inspected are set as follows: a lens with an R value of 40 and a tolerance of 0.009; taking lens III with the R value of 40 as a standard component, taking lens I with the R value of 40 tolerance upper limit +0.009 and taking lens II with the R value of 40 tolerance lower limit-0.009; the method comprises the steps of firstly placing a lens III on an auxiliary fixture 5, changing the central position and the relative distance between a measured surface of the lens III and an interferometer lens 12 until the number of interferometer fringes on a screen is 0 which can be recognized by naked eyes, then placing a lens I and a lens II on the auxiliary fixture respectively, wherein the positions of the auxiliary fixture 5 relative to the interferometer lens 12 do not need to be adjusted, and the number of the interference fringes obtained by the lens I and the lens II is 4; namely, the number of fringes of an interferometer image is 0-4, the corresponding R value is 39.991-40.009, namely, whether the R value is deviated or not can be judged according to the number of the fringes during measurement, and then good products and defective products of the R value of the lens are distinguished; finally, sequentially placing the finished lens products to be inspected on the auxiliary jig, and if the number of the interference fringes of the corresponding lens is more than 4, determining that the R value deviation of the lens exceeds the allowable tolerance range; if the number of the interference fringes of the corresponding lens is between 0 and 4, the R value of the lens is determined not to exceed the allowable tolerance range, and the requirement is met.
The auxiliary jig is stably connected with the interferometer bracket, the contact positioning of the measured surface of the lens and the three points of the auxiliary jig is stable, and the surface type and the R value deviation of the lens can be quickly identified only by replacing the lens.
Claims (10)
1. The utility model provides an optical lens face type measuring supplementary tool which characterized in that: the auxiliary jig (5) is in a bowl shape with a hollow bottom; the auxiliary jig (5) is fixed above the interferometer lens (12) through a hole-type bracket; the bottom of the auxiliary jig (5) is formed by alternately arranging hollow areas (6) and non-hollow areas (13), and the diameter of an integral gap formed by the plurality of hollow areas (6) at the bottom of the auxiliary jig (5) is larger than that of the lens (4) to be measured; the non-hollowed-out areas (13) between the adjacent hollowed-out areas are provided with supporting points (14), and the lens (4) to be tested is placed on the supporting points (14).
2. The auxiliary fixture for measuring the surface shape of an optical lens according to claim 1, wherein: the vertical distance between the auxiliary jig (5) and the interferometer lens (12) is adjusted through the hole-type bracket.
3. The auxiliary fixture for measuring the surface shape of an optical lens according to claim 1, wherein: the central line of the bowl-shaped auxiliary jig (5) is taken as an axis, and the plurality of hollow areas (6) are uniformly distributed on the periphery of the central line.
4. The auxiliary fixture for measuring the surface shape of an optical lens according to claim 3, wherein: the number of the hollow areas (6) is three, and the hollow areas (6) are fan-shaped; the included angle of the central lines of the adjacent sector areas is 120 degrees.
5. The auxiliary fixture for measuring the surface shape of an optical lens according to claim 1, wherein: the inner diameter of the auxiliary jig (5) is gradually reduced from top to bottom, when the lens (4) to be measured is a convex lens, the bottom of the auxiliary jig (5) is arranged on the hole-shaped bracket, the non-hollowed-out area (13) between adjacent hollowed-out areas (6) is provided with the front end of an upward bulge (15), and the included angle between the upward bulge (15) and the side connecting wall is 115-120 degrees; the lens (4) to be measured is placed at the upward bulge (15) of each non-hollow area (13).
6. The auxiliary fixture for measuring the surface shape of an optical lens according to claim 5, wherein: the three upward bulges (15) are smooth sharp points, the vertical heights of the three upward bulges (15) from the bowl bottom are consistent, and the connecting lines of the three upward bulges (15) in the same plane form an equilateral triangle.
7. The auxiliary fixture for measuring the surface shape of an optical lens according to claim 1, wherein: the internal diameter of the auxiliary jig (5) is gradually decreased from top to bottom, when the lens (4) to be measured is a concave lens, the top of the auxiliary jig (5) is arranged on the hole type bracket, the non-hollowed-out areas (13) between the adjacent hollowed-out areas (6) are provided with the front ends protruding downwards (16), the included angle between the downward protruding (16) and the side connecting wall is 0 degree, and the lens (4) to be measured is placed at the downward protruding (16) of each non-hollowed-out area (13).
8. The auxiliary fixture for measuring the surface shape of an optical lens according to claim 7, wherein: the three downward bulges (16) are smooth sharp points, the vertical heights of the three downward bulges (16) from the bowl bottom are consistent, and the connecting lines of the three downward bulges (16) in the same plane form an equilateral triangle.
9. The method for measuring the surface accuracy of an optical lens by using the auxiliary fixture according to claim 1, is characterized in that: the auxiliary jig (5) is arranged above the interferometer lens (12) through the hole type bracket, the measured surface of the lens (4) to be measured is placed on a supporting point (14) of the auxiliary jig (5), the position of the auxiliary jig (5) is adjusted through the hole type bracket, the measured surface center of the lens (4) to be measured is aligned with the center of the interferometer lens (12), the distance between the auxiliary jig (5) and the interferometer lens (12) is adjusted through the hole type bracket, the imaging image condition on a screen is observed, the center position and the relative distance between the measured surface of the lens (4) to be measured and the interferometer lens (12) are changed until the number of interferometer fringes on the screen is easily recognized by human eyes, and the accuracy of the lens surface type is recognized by the human eyes according to the curvature of the interferometer fringes.
10. The method for measuring the R value deviation of the optical lens by using the auxiliary fixture according to claim 1, is characterized in that: the batch of lens finished products to be inspected are set as follows: a lens with R value of C and tolerance of D; taking a lens III with the R value of C as a standard component, taking the tolerance upper limit + D of the R value of C as a lens I, and taking the tolerance lower limit-D of the R value of C as a lens II; the method comprises the steps of firstly placing a lens III on an auxiliary fixture (5), changing the central position and the relative distance between the measured surface of the lens III and an interferometer lens (12) until the number of interferometer fringes on a screen is a value A which can be recognized by naked eyes, then placing a lens I and a lens II on the auxiliary fixture (5) respectively, wherein the position of the auxiliary fixture (5) does not need to be adjusted, and the number of the interference fringes obtained by the lens I and the lens II is B; finally, sequentially placing the finished lens to be inspected on an auxiliary jig (5), and if the number of the interference fringes of the corresponding lens is greater than B, determining that the R value deviation of the lens exceeds the allowable tolerance range; if the number of the interference fringes of the corresponding lens is between A and B, the R value of the lens is determined not to exceed the allowable tolerance range, and the requirement is met.
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| CN202111271706.8A CN114046730B (en) | 2021-10-29 | 2021-10-29 | Optical lens auxiliary jig and measuring method of surface type precision and R value deviation thereof |
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| CN202111271706.8A CN114046730B (en) | 2021-10-29 | 2021-10-29 | Optical lens auxiliary jig and measuring method of surface type precision and R value deviation thereof |
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