CN111272111A - Eccentricity detection method and eccentricity detection device for lens - Google Patents
Eccentricity detection method and eccentricity detection device for lens Download PDFInfo
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- CN111272111A CN111272111A CN202010251448.6A CN202010251448A CN111272111A CN 111272111 A CN111272111 A CN 111272111A CN 202010251448 A CN202010251448 A CN 202010251448A CN 111272111 A CN111272111 A CN 111272111A
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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
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
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Abstract
The invention relates to an eccentricity detection method and device for a lens, wherein the device comprises an eccentricity detector (1) and a rotary table (2), and further comprises a supporting device (4) and a distance meter (5) movably arranged on the supporting device (4), and light of the distance meter (5) irradiates the outer circle of the lens to be detected. According to the invention, the horizontal offset of the lens to be detected is measured by using the distance meter, so that the horizontal offset can be deducted when the actual eccentric amount is calculated, and a centering device is not required, thereby reducing the abrasion of the lens and improving the detection efficiency.
Description
Technical Field
The invention relates to the field of optical device detection, in particular to an eccentricity detection method and an eccentricity detection device for detecting the eccentricity of a lens.
Background
The lens is used as an important part in the lens and plays a critical role in the imaging quality of the whole lens. In the prior art, the eccentricity detection method is that a lens is fixed on a rotary platform, the lens is fixed on the rotary platform through a tool, an eccentricity detector is arranged above the rotary platform, the rotary platform is rotated to carry out eccentricity detection, the lens and the rotary platform are required to be coaxial during detection in the mode, the lens is required to be adjusted again when the lenses with different sizes are replaced, and the detection efficiency is low.
Disclosure of Invention
The invention aims to provide an eccentricity detection method and an eccentricity detection device without centering a lens.
In order to achieve the above object, the present invention provides an eccentricity detection method for a lens, comprising the steps of:
a. irradiating the light of the eccentric detection equipment on the measured lens surface of the lens to be detected, and irradiating the light of the distance measurement equipment on the excircle of the lens to be detected;
b. rotating the lens to be detected, and calculating an eccentricity measurement value of the measured lens surface and a horizontal offset of the lens to be detected according to light rays reflected from the measured lens surface and the lens excircle respectively;
c. and calculating the actual eccentricity of the measured mirror surface by using the eccentricity measurement value and the horizontal offset.
According to an aspect of the present invention, in the step (a), the light irradiated on the surface of the lens to be measured is condensed light, and an extended line of the condensed light is irradiated to a position of a spherical center of the lens.
According to an aspect of the present invention, in the step (b), the image formed by the light reflected from the measured lens surface can rotate with the rotation of the lens, and the measured eccentricity value is calculated by the following formula:
eccentricity measurement value is equal to radius/magnification;
the radius is a radius of a rotation locus circle of an image formed by light reflected from the test mirror surface, and the magnification is a magnification of an optical system for converging light irradiated to the test mirror surface.
According to an aspect of the present invention, in the step (b), the horizontal offset amount is calculated by:
horizontal offset (maximum value in horizontal direction of range measurement-minimum value in horizontal direction of range measurement)/2
The maximum value in the horizontal direction of the distance measurement and the minimum value in the horizontal direction of the distance measurement respectively refer to distance measurement values when a device for receiving light reflected from the outer circle of the lens is farthest from and closest to the outer circle of the lens.
According to an aspect of the present invention, the calculation formula of the actual eccentricity amount in the step (c) is:
actual eccentricity is measured as eccentricity-horizontal offset.
The eccentricity detection device for the lens comprises an eccentricity detector, a rotary table, a supporting device and a distance meter movably arranged on the supporting device, wherein light of the distance meter irradiates the excircle of the lens to be detected.
According to one aspect of the invention, the support means is a three-axis adjustment platform or a three-dimensional adjustment platform by which the rangefinder can be adjusted to emit light onto the outer circle of the lens to be inspected.
According to one aspect of the invention, the eccentricity detector comprises a detector body and a stand column;
the detector main body comprises a detection end, a connecting end and a double-shaft adjusting platform for driving the detection end to move;
the connecting end is connected with the upright post through a guide rail.
According to one aspect of the present invention, the turntable is provided with an air passage and an air pump communicating with the air passage.
According to one aspect of the invention, the device further comprises a base for supporting the upright, the turntable and the supporting device;
the rotary table is an air-flotation rotary table.
According to one scheme of the invention, a distance meter for detecting the horizontal offset of the lens is additionally arranged, and the horizontal offset can be deducted from the measured value of the eccentricity measured by the eccentricity detector in the subsequent calculation process to obtain the actual eccentricity of the side lens. So, need not to set up centring means on the air supporting revolving stage, also need not to carry out the centering at the testing process, so neither can cause wearing and tearing to the lens excircle, saved the centering step again, improved detection efficiency.
According to one scheme of the invention, the air pump is added to enable negative pressure to be formed in the air channel of the air floatation rotary table, so that the lens on the rotary table is adsorbed, and the lens is not easy to move relatively when the rotary table of the rotary table rotates, and is not easy to wear.
Drawings
FIG. 1 is a block diagram schematically showing an eccentricity detecting apparatus according to an embodiment of the present invention;
fig. 2 is a flow chart schematically showing the detection of the eccentricity detecting apparatus according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Fig. 1 is a structural view schematically showing an eccentricity detecting apparatus according to an embodiment of the present invention. As shown in fig. 1, the eccentricity detecting apparatus of the present invention includes an eccentricity detector 1, a turntable 2, a supporting device 4, a distance meter 5, and a base 6. Of course, the base 6 is not an essential part and functions to support other equipment. The eccentric detector 1 is divided into a detector main body 1a and an upright post 1b, and the upright post 1b is fixed on a base 6 through a set screw. The inspection apparatus body 1a is divided into an inspection end and a connection end (i.e., left and right ends in fig. 1), wherein the connection end is connected to the column 1b, and the inspection end includes a light source, a cross target, an optical system, and an image sensor (i.e., a camera). Light emitted by the light source passes through the cross target to be changed into cross light, and then is converged by the optical system. Because light needs to be converged at the curvature center (namely the spherical center of the lens) of the upper side lens surface of each lens when the eccentricity of the lens is detected, the upper and lower lens surfaces of the lens can be respectively detected when the lens is detected, and therefore, the convergence point corresponds to the curvature center of the surface to be detected when different surfaces are detected. Therefore, the detector body 1a needs to be movable on the upright 1b, and therefore, the invention provides a guide rail on the upright 1b, and the connecting end of the detector body 1a is connected to the guide rail. Therefore, the detector main body 1a can move linearly up and down on the upright post 1b, and is screwed down through the knob after moving in place. However, since the eccentricity detecting device of the present invention is not provided with a centering device, when the lens is placed on the turntable 2, a horizontal deviation may occur, and therefore, the light emitted from the detecting end of the detecting instrument body 1a cannot accurately find the curvature center only by moving up and down, and therefore, a biaxial adjusting platform for driving the detecting end to move back and forth and left and right in the horizontal direction should be further provided.
The turntable 2 is also supported by a base 6, which is disposed below the detection end of the monitor main body 1 a. The turntable 2 of the present invention is an air-floating turntable, which can achieve the function in the prior art, so the present invention does not need to describe the structure of the turntable 2 any more, but at least has a housing, a turntable, and a motor or other driving device for driving the turntable to rotate, and the lens B to be detected is placed on the turntable. And an air channel is arranged on the shell of the rotary table 2, one end of the air channel penetrates through the rotary table of the rotary table 2, the other end of the air channel penetrates through any one surface of the shell, and the end of the air channel is connected with an air pump and used for forming negative pressure in the air channel so as to suck the lens B to be detected. This kind of fixed mode of utilizing atmospheric pressure to adsorb the lens for wait to detect when the carousel of revolving stage 2 rotates and can not take place relative movement between lens B and the carousel, consequently can not treat and detect lens B and cause wearing and tearing. Of course, the lens can be directly placed on the turntable of the turntable 2 without an adsorption mode, and the lens B to be detected can not move relatively when the turntable rotates by setting appropriate surface roughness and appropriate starting torque.
In the invention, the distance meter 5 is added to detect the horizontal offset of the lens B to be detected due to the placement, so that the actual eccentric amount can be obtained by directly deducting the horizontal offset from the measured value of the eccentric amount detected by the eccentric detector 1 in subsequent calculation, and therefore, the lens does not need to be centered when a new lens is deployed on the rotary table 2 every time, a centering device such as a three-jaw clamp or a V-shaped block does not need to be arranged, the detection efficiency is improved, and the lens is not abraded due to the clamp. Of course, even so, since the detection area of the camera in the eccentricity detector 1 is limited, the horizontal offset should not be made too large when placing the lens, and should be adapted to the detection area of the camera used. As shown in fig. 1, the turntable 2 is supported on a base 6, and has a certain height, in order to ensure that the light emitted by the distance measuring instrument 5 can horizontally irradiate on the excircle of the lens B to be detected, so as to sample and take a point on the excircle of the lens, and then calculate the horizontal offset through software, the invention also provides a supporting device 4 for supporting the distance measuring instrument 5. In order to enable the supporting device 4 to adjust the height of the distance measuring instrument 5, the supporting device 4 of the invention is a three-axis (three-dimensional) adjusting platform, and the distance measuring instrument 5 can be aligned to the outer circle of the lens to emit light by adjusting the three-axis adjusting platform.
In the invention, the eccentric detector 1 and the range finder 5 are both connected with a computer A. The cross light irradiated on the lens by the light source of the eccentric detector 1 is reflected by the lens (the invention utilizes the spherical center reflection principle), the reflected light is converged again to form a spherical center image, the spherical center image is received by the camera and transmitted to the computer A, and the cross light is still displayed by the display of the computer A.
Fig. 2 is a flow chart schematically showing the detection of the eccentricity detecting apparatus according to an embodiment of the present invention. With reference to fig. 1 and 2, when the eccentricity detection device of the present invention is used to detect the eccentricity, the upper and lower mirror surfaces of the lens can be detected separately, or one mirror surface can be detected separately. Firstly, the lens is placed on a turntable of a turntable, the lens surface positioned on the upper side is always the measured lens surface, because of the existence of horizontal offset, the eccentric detector 1 needs to be adjusted to enable the light emitted by the eccentric detector to be converged at the curvature center of the side lens surface (namely the extension line of the converged light irradiates the spherical center of the lens), and the display on the computer A can be observed in the adjusting process until cross light appears. As is well known, the mirror reflection is divided into specular reflection and spherical center reflection, and the present invention utilizes spherical center reflection, but the specular reflection also causes cross light to appear on the display. The difference is that the cross light appearing in specular reflection is fixed and does not rotate with the rotation of the lens. Therefore, after the cross light appears on the display, the rotatable turntable can observe whether the cross light moves, if the cross light moves, the cross light can be proved to be a spherical center image, and otherwise, the adjustment is continued. And then adjusting the three-axis adjusting platform (namely the supporting device 4) to enable the light emitted by the distance measuring instrument 5 to irradiate the excircle of the lens, and also receiving the reflected light to complete distance measurement.
After the above-mentioned work is completed, the turntable of the turntable 2 can be controlled to rotate (at least one circle), and at this time, if the lens has a certain degree of eccentricity, the optical axis of the lens deviates from the rotation axis of the turntable. Therefore, as the turntable rotates, the cross light on the display of the computer a moves circularly along a certain radius, and the cross light on the display represents the convergence point of the light reflected by the lens. Then, the rotation radius can be converted into an eccentricity measurement value through a geometric relation conversion formula, wherein the specific conversion formula is as follows:
eccentricity measurement value is equal to radius/magnification;
wherein, the radius refers to the radius of a moving track circle of cross light in the display, and the magnification refers to the magnification of an optical system in the eccentric detector. It should be noted that, because the length of the column 1B is limited, if the curvature radius of the lens B to be detected is too large, the optical system needs to be replaced to converge the light to the curvature center of the lens. In the rotating process of the turntable, the light of the distance measuring instrument 5 constantly irradiates on the excircle of the lens B to be detected, the horizontal offset can be calculated according to the measured value, and the calculation formula is as follows:
the horizontal offset is (maximum value in the horizontal direction of ranging-minimum value in the horizontal direction of ranging)/2;
the maximum value in the horizontal direction of the distance measurement and the minimum value in the horizontal direction of the distance measurement respectively refer to the distance measurement value when the distance meter is farthest from and closest to the excircle of the lens to be detected. The horizontal direction here means that the light emitted by the distance measuring instrument 5 vertically and horizontally irradiates the outer circle of the lens to be measured. Horizontal offset can directly be transmitted to computer A (need not to show), and computer A subtracts horizontal offset from the eccentricity measurement and can obtain the actual eccentricity of this side mirror surface, and the computational formula is:
actual eccentricity is measured value-horizontal offset;
after the detection of the side lens is finished, the lens can be turned over, and then the steps are repeated to detect the other side. Therefore, the distance meter 5 for measuring the horizontal offset of the lens caused by placement is introduced into the lens eccentricity detection, so that a centering device does not need to be independently arranged, the lens is prevented from being abraded, the lens centering process is omitted, and the detection efficiency is improved.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An eccentricity detection method for a lens, comprising the steps of:
a. irradiating the light of the eccentric detection equipment on the measured lens surface of the lens to be detected, and irradiating the light of the distance measurement equipment on the excircle of the lens to be detected;
b. rotating the lens to be detected, and calculating an eccentricity measurement value of the measured lens surface and a horizontal offset of the lens to be detected according to light rays reflected from the measured lens surface and the lens excircle respectively;
c. and calculating the actual eccentricity of the measured mirror surface by using the eccentricity measurement value and the horizontal offset.
2. The decentration detection method according to claim 1, wherein in the step (a), the light irradiated on the test lens surface is condensed light, and an extended line of the condensed light is irradiated to a position of a spherical center of the lens.
3. The eccentricity detection method according to claim 2, wherein in the step (b), the image of the light reflected from the measured lens surface is rotated with the rotation of the lens, and the measured value of the eccentricity is calculated by the formula:
eccentricity measurement value is equal to radius/magnification;
the radius is a radius of a rotation locus circle of an image formed by light reflected from the test mirror surface, and the magnification is a magnification of an optical system for converging light irradiated to the test mirror surface.
4. The eccentricity detection method according to claim 3, wherein in the step (b), the horizontal offset amount is calculated by:
horizontal offset (maximum value in horizontal direction of range measurement-minimum value in horizontal direction of range measurement)/2
The maximum value in the horizontal direction of the distance measurement and the minimum value in the horizontal direction of the distance measurement respectively refer to distance measurement values when a device for receiving light reflected from the outer circle of the lens is farthest from and closest to the outer circle of the lens.
5. The eccentricity detection method according to claim 4, wherein the actual eccentricity amount in step (c) is calculated by the formula:
actual eccentricity is measured as eccentricity-horizontal offset.
6. The eccentricity detection device for the lens comprises an eccentricity detector (1) and a rotary table (2), and is characterized by further comprising a supporting device (4) and a distance meter (5) movably arranged on the supporting device (4), wherein light of the distance meter (5) irradiates to the excircle of the lens to be detected.
7. Eccentricity detection device according to claim 6, characterised in that the support means (4) is a three-axis or three-dimensional adjustment platform, by which the rangefinder (5) can be adjusted to emit light onto the outer circle of the lens to be inspected.
8. The eccentricity detection device according to claim 7, wherein the eccentricity detector (1) comprises a detector body (1a) and a column (1 b);
the detector main body (1a) comprises a detection end, a connecting end and a double-shaft adjusting platform for driving the detection end to move;
the connecting end is connected with the upright post (1b) through a guide rail.
9. Eccentricity detection device according to any one of claims 6 to 8, wherein the turntable (2) is provided with an air duct and an air pump communicating with the air duct.
10. The eccentricity detection device according to claim 8, further comprising a base (6) for supporting the upright (1b), the turntable (2) and the support means (4);
the rotary table (2) is an air-floating rotary table.
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| CN202010251448.6A CN111272111A (en) | 2020-04-01 | 2020-04-01 | Eccentricity detection method and eccentricity detection device for lens |
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| CN202010251448.6A CN111272111A (en) | 2020-04-01 | 2020-04-01 | Eccentricity detection method and eccentricity detection device for lens |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678402A (en) * | 2020-07-17 | 2020-09-18 | 湖北新华光信息材料有限公司 | Detection apparatus for short-term test type spare is eccentric |
| CN114624010A (en) * | 2022-05-16 | 2022-06-14 | 嘉兴中润光学科技股份有限公司 | Eccentricity testing method |
| CN114755782A (en) * | 2022-02-25 | 2022-07-15 | 深圳市深视智能科技有限公司 | Point spectrum lens mounting method, device, system, storage medium and product |
| CN114923668A (en) * | 2022-07-19 | 2022-08-19 | 嘉兴中润光学科技股份有限公司 | Lens testing module and lens testing method |
-
2020
- 2020-04-01 CN CN202010251448.6A patent/CN111272111A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678402A (en) * | 2020-07-17 | 2020-09-18 | 湖北新华光信息材料有限公司 | Detection apparatus for short-term test type spare is eccentric |
| CN114755782A (en) * | 2022-02-25 | 2022-07-15 | 深圳市深视智能科技有限公司 | Point spectrum lens mounting method, device, system, storage medium and product |
| CN114624010A (en) * | 2022-05-16 | 2022-06-14 | 嘉兴中润光学科技股份有限公司 | Eccentricity testing method |
| CN114624010B (en) * | 2022-05-16 | 2022-08-23 | 嘉兴中润光学科技股份有限公司 | Eccentricity testing method |
| CN114923668A (en) * | 2022-07-19 | 2022-08-19 | 嘉兴中润光学科技股份有限公司 | Lens testing module and lens testing method |
| CN114923668B (en) * | 2022-07-19 | 2022-12-13 | 嘉兴中润光学科技股份有限公司 | Lens testing module and lens testing method |
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