CN211717400U

CN211717400U - Eccentricity detection device for lens

Info

Publication number: CN211717400U
Application number: CN202020458371.5U
Authority: CN
Inventors: 渠旭; 修建鸿; 马赫
Original assignee: Ningbo Sunny Infrared Technologies Co Ltd
Current assignee: Ningbo Sunny Infrared Technologies Co Ltd
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2020-10-20
Anticipated expiration: 2030-04-01

Abstract

The utility model relates to an eccentric detection device for lens, including eccentric detector (1) and revolving stage (2), still include supporting arrangement (4) and movably setting up distancer (5) on supporting arrangement (4), the light irradiation of distancer (5) is to the excircle of the lens that awaits measuring. The utility model discloses utilize the distancer to measure the horizontal offset who waits to detect the lens to can deduct horizontal offset when calculating actual eccentric magnitude, thereby need not to set up centring means, thereby reduced the wearing and tearing to the lens, and improved detection efficiency.

Description

Eccentricity detection device for lens

Technical Field

The utility model relates to an optical device detects the field, especially relates to an eccentric detection device for detecting lens eccentricity.

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.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a need not to carry out eccentric detection device of lens centering.

In order to achieve the above object, the present invention provides an eccentric detecting device for lens, including eccentric detector and revolving stage, still include supporting device and movably setting up distancer on the supporting device, the light irradiation of distancer is to the excircle of the lens that awaits measuring.

According to the utility model discloses an aspect, supporting arrangement adjusts platform or three-dimensional regulation platform for the triaxial, the distancer can be adjusted to the transmitted light by it and can shine on waiting to detect the excircle of lens.

According to one aspect of the present invention, the eccentric detector comprises a detector main body and a 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 an aspect of the utility model, the revolving stage is equipped with the air duct and communicates the air pump of air duct.

According to one aspect of the present invention, the device further comprises a base for supporting the column, the turntable and the supporting device;

the rotary table is an air-flotation rotary table.

According to the utility model discloses a scheme adds and establishes the distancer that is used for detecting the horizontal offset of lens, can deduct the eccentric measurement value that the horizontal offset measured from eccentric detector in follow-up calculation process, obtains the actual eccentric measurement of this side mirror surface. 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 the utility model discloses a scheme increases the air pump and makes and to form the negative pressure in the air duct of air supporting revolving stage to adsorb the lens on the revolving stage, thereby make the difficult relative movement that takes place of lens when the carousel of revolving stage rotates take place wearing and tearing.

Drawings

Fig. 1 is a structural view schematically showing an eccentricity detecting apparatus according to an embodiment of the present invention;

fig. 2 is a detection flowchart schematically illustrating an eccentricity detection 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," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is 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 eccentric detecting device of the present invention includes an eccentric detecting instrument 1, a turntable 2, a supporting device 4, a distance measuring instrument 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 need assemble light at the curvature center (being the lens centre of sphere) of every lens upside mirror surface when detecting lens eccentric volume, and the utility model discloses can detect two upper and lower mirror surfaces of lens respectively when detecting the lens, consequently the convergent point corresponds to the curvature center of waiting to detect the face when detecting the different planes. Therefore, detector main part 1a needs to be able to move on stand 1b, consequently the utility model discloses set up the guide rail on stand 1b, detector main part 1 a's link is then connected on 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, because the utility model discloses an eccentric detection device does not set up centring means, and therefore when the lens was placed on revolving stage 2, the skew in the horizontal direction probably took place, so the light of the sense terminal transmission of detector main part 1a only through reciprocate can not be accurate find above-mentioned curvature center, consequently should still set up the biax that drives the sense terminal and move around the horizontal direction and adjust the platform.

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 utility model discloses a revolving stage 2 is the air supporting revolving stage, and this function can be realized to the air supporting revolving stage homoenergetic among the prior art, consequently the utility model discloses no longer giving unnecessary details the structure of revolving stage 2, nevertheless should have casing, carousel and drive carousel pivoted motor or other drive arrangement at least, wait to detect lens B and then place on the carousel. 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.

The utility model discloses in, increased distancer 5 and detected the horizontal offset that waits to detect lens B owing to place the reason and lead to, directly deduct the horizontal offset and can obtain actual eccentric magnitude in the eccentric magnitude measured value that eccentric detector 1 detected when follow-up calculation from this, consequently need not to the lens centering on 2 upper disposes new lenses of revolving stage at every turn, also need not to set up the centring means of three-jaw anchor clamps or V type piece class, detection efficiency has both been improved, can not cause wearing and tearing because of anchor clamps itself to the lens again. 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, revolving stage 2 supports on base 6, and it possesses the take the altitude, and the light that sends for guaranteeing distancer 5 can be horizontally shine on waiting to detect lens B's excircle to sample on the lens excircle and get the point, calculate horizontal offset through software afterwards, the utility model discloses still set up supporting arrangement 4 and supported distancer 5. In order to make supporting arrangement 4 can adjust the height of distancer 5, the utility model discloses a supporting arrangement 4 is triaxial (three-dimensional) and adjusts the platform, can make distancer 5 aim at lens excircle emission light through adjusting triaxial and adjusting the platform.

The utility model discloses well eccentric detector 1 and distancer 5 all connect computer A. The cross light that the light source of eccentric detector 1 shone on the lens is reflected through the lens (the utility model discloses utilize centre of sphere reflection principle), and the reflected light assembles once more and forms the centre of sphere like, receives by the camera and passes to computer A, and what computer A's display showed still is the cross light.

Fig. 2 is a flow chart schematically showing the detection of the eccentricity detecting device according to an embodiment of the present invention. Combine fig. 1 and fig. 2, utilize the utility model discloses an eccentric detection device carries out when the eccentric quantity detects, can detect two upper and lower mirror surfaces of lens respectively, also can detect a mirror surface alone. 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 the 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 utility model discloses introduce the distancer 5 of measuring the lens owing to place the horizontal offset that the reason produced in lens eccentricity detects to need not to set up alone and be used for centring means, avoided causing wearing and tearing to the lens, also saved lens centering process simultaneously, improved detection efficiency.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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

1. 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.

2. Eccentricity detection device according to claim 1, 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.

3. The eccentricity detection device according to claim 2, 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.

4. Eccentricity detection device according to any one of claims 1 to 3, wherein the turntable (2) is provided with an air duct and an air pump communicating with the air duct.

5. Eccentricity detection device according to claim 3, further comprising a base (6) for supporting the upright (1b), turntable (2) and support means (4);

the rotary table (2) is an air-floating rotary table.