An eccentricity detection compensation mechanism, an eccentricity detection device, and a method of aligning

Abstract

The application discloses a eccentricity detection compensation mechanism, comprising a clamping mechanism, a displacement sensor and an adjusting mechanism, the clamping mechanism comprises a positioning member and a movable member, two positioning edges are arranged on the positioning member, the two positioning edges have a preset included angle, the movable member moves along a preset moving direction to make the lens group be clamped and fixed against the two positioning edges and the movable member, the displacement sensor measures the position data of the movable member, the clamping mechanism is arranged on the adjusting mechanism and is driven by the adjusting mechanism to move, and the adjusting mechanism comprises a first straight line adjusting assembly along the direction of the angle bisector of the included angle of the two positioning edges. The eccentricity detection device adopting the application can conveniently and accurately adjust the position of the lens group, ensures that the profile center of the lens group is concentric with the rotating shaft of the rotating platform, and guarantees the accuracy and efficiency of eccentricity detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical device detection, in particular to a decentration detection compensation mechanism, a decentration detection device and a centering method. BACKGROUND

[0002] The lens is an important component of the lens and plays a key role in the imaging quality of the entire lens. After the optical lens is produced, various detections need to be performed, including decentration detection of the lens. The decentration detection is usually performed by mounting the lens on a rotating platform, and an eccentricity detector is arranged above the rotating platform. The rotating platform is rotated to perform the decentration detection. This method requires that the center of the outer circle of the lens is concentric with the rotation axis of the rotating platform. If the surface spherical center of the lens is not eccentric relative to the outer circle of the lens, the spherical center reflection image (cross bright spot) on the monitor of the eccentricity detector will not rotate. If the surface spherical center of the lens is eccentric relative to the outer circle of the lens, the spherical center reflection image (cross bright spot) on the monitor will rotate. The movement track is the movement track of the spherical center around the outer circle of the lens after being magnified by the optical system. The lens usually includes groups of lenses with different outer diameter sizes. When the groups of lenses with different outer diameter sizes are switched for decentration detection, the profile center of the groups of lenses with different outer diameter sizes needs to be adjusted to be concentric with the rotation axis of the rotating platform. The adjustment is complicated, difficult and inefficient, which affects the overall detection efficiency. SUMMARY

[0003] The technical problem to be solved by the present application and the technical task proposed are to improve the prior art, and provide a decentration detection compensation mechanism to solve the problem of frequent re-adjustment of the concentricity of the profile center of the groups of lenses with different outer diameter sizes and the rotation axis of the rotating platform, which is difficult and inefficient.

[0004] To solve the above technical problems, the technical solution of the present application is:

[0005] The eccentricity detection compensation mechanism comprises a clamping mechanism, a displacement sensor and an adjusting mechanism, the clamping mechanism comprises a fixed part and a movable part, the fixed part is provided with two positioning edges, the two positioning edges have a preset included angle, the movable part moves along a preset moving direction to clamp and fix the lens group against the two positioning edges and the movable part, the displacement sensor measures the position data of the movable part, the clamping mechanism is arranged on the adjusting mechanism and is driven by the adjusting mechanism to move, and the adjusting mechanism comprises a first linear adjusting assembly along the angle bisector direction of the included angle of the two positioning edges.The eccentricity detection compensation mechanism can conveniently and accurately find the profile center of the lens group, and then the profile center of the lens group can be conveniently adjusted to ensure that the profile center of the lens group is concentric with the rotation axis of the rotating platform, so that the accuracy of eccentricity detection is ensured, the peripheral profile of the lens group is circular as a whole, the lens group is arranged in the included angle region of the two positioning edges, when the lens group is in contact with the two positioning edges, the profile center of the lens group is necessarily on the angle bisector of the included angle of the two positioning edges, the movable part moves along the preset direction to clamp and fix the lens group between the two positioning edges and the movable part, so that the lens group is in contact with the two positioning edges, the profile center of the lens group is necessarily on the angle bisector of the included angle of the two positioning edges, and the position of the profile center of the lens group on the angle bisector of the included angle of the two positioning edges is different, the position data of the profile center of the lens group can be obtained by calculating the position data of the movable part measured by the displacement sensor, and then the overall position of the clamping mechanism can be adjusted by the adjusting mechanism, that is, the position of the lens group is adjusted, so that the profile center of the lens group is concentric with the rotation axis of the rotating platform, the structure of the two positioning edges realizes the automatic centering function of the profile center of the lens group, that is, the positioning in the direction perpendicular to the angle bisector is realized, the rotation axis of the rotating platform can be arranged on the path of the angle bisector of the included angle of the two positioning edges in advance, so that only one degree of freedom is needed to make the profile center of the lens group concentric with the rotation axis of the rotating platform, in other words, the adjusting mechanism only has the first linear adjusting assembly along the angle bisector direction of the included angle of the two positioning edges, so that the adjusting requirement is met, the implementation is convenient, the structure is simple, the efficiency of adjustment is improved, and the overall efficiency of eccentricity detection is improved.

[0006] Further, the preset moving direction is the angle bisector direction of the included angle of the two positioning edges, or the preset moving direction is the straight line direction of one of the positioning edges. The position data of the profile center of the lens group can be conveniently calculated from the position data of the movable part, and the calculation process is simple, and the position data of the movable part can directly show the position of the profile center of the lens group.

[0007] Further, the movable part is provided with a clamping surface perpendicular to the preset moving direction of the movable part, the clamping surface cooperates with the two positioning edges to clamp and fix the lens group in a three-point contact mode, the peripheral contour of the lens group is in a whole circular shape, specifically including three circular arc shapes and a whole circular shape, the three-point contact mode has good applicability, can clamp different types of lens groups, has good clamping stability, and the contact point of the clamping surface and the lens group is located on the path of the angle bisector of the included angle between the two positioning edges, the position data of the contact point of the clamping surface and the lens group can be conveniently measured, and then the contour center position of the lens group can be conveniently calculated, and then accurate adjustment can be performed.

[0008] Further, the first linear adjustment assembly adopts an electric assembly to automatically adjust according to the position data obtained by the displacement sensor, without manual adjustment, improving convenience.

[0009] Further, when the lens group is clamped and fixed, the contour center of the lens group is located on the angle bisector of the included angle between the two positioning edges. Only the position of the lens group needs to be adjusted along the angle bisector of the included angle between the two positioning edges, so that the contour center of the lens group is concentric with the rotation axis of the rotating platform, and the adjustment is convenient and accurate.

[0010] An eccentricity detection device includes the eccentricity detection compensation mechanism, and the eccentricity detection compensation mechanism is arranged on a rotating platform of the eccentricity detection device. The eccentricity detection compensation mechanism can be used to flexibly and conveniently adjust the position of the lens group, ensure that the contour center of the lens group is concentric with the rotation axis of the rotating platform, and improve the accuracy of eccentricity detection.

[0011] Further, the rotating platform is further provided with a rotating drag chain, and the rotating drag chain is used to pull and protect the cables, air pipes and the like arranged in the rotating drag chain.

[0012] A centering method of the eccentricity detection device, and the steps include:

[0013] In step one, a standard lens is clamped and fixed by the clamping mechanism, and the adjusting mechanism is actuated to make the outer circle center of the standard lens concentric with the rotation axis of the rotating platform, and the data of the displacement sensor at this time is recorded as standard data.

[0014] In step two, the lens group is clamped and fixed by the clamping mechanism, and the data of the displacement sensor at this time is recorded as the to-be-compared data, the deviation value of the contour center of the lens group relative to the outer circle center of the standard lens is calculated according to the included angle between the two positioning edges, the standard data and the to-be-compared data, and the adjusting mechanism is actuated according to the deviation value to make the contour center of the lens group concentric with the rotation axis of the rotating platform.

[0015] Further, in the step one, after the standard lens is clamped and fixed by the clamping mechanism, the rotating platform of the eccentricity detection device rotates one circle, the eccentricity detector of the eccentricity detection device measures the current eccentricity, the adjusting mechanism adjusts according to the eccentricity, and the process is repeated until the eccentricity measured by the eccentricity detector is less than the preset value, so that the outer circle center of the lens is concentric with the rotating axis of the rotating platform, and then the data of the displacement sensor at this time is recorded as the standard data.

[0016] Further, the deviation value of the profile center of the lens group relative to the outer circle center of the standard lens is O2-O1=(csc(θ / 2) / (1+csc(θ / 2)))×(L2-L1), wherein O2 is the profile center position of the lens group, O1 is the outer circle center position of the standard lens, θ is the included angle between the two positioning edges, L2 is the to-be-compared data, and L1 is the standard data. The adjustment amount can be calculated by measuring L2 and L1, and the exact radius values of the standard lens and the lens group do not need to be known, the parameters involved in the calculation are few, and the calculation is convenient and simple.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] The eccentricity detection compensation mechanism and the eccentricity detection device adopting the same can conveniently and accurately adjust the position of the lens group, ensure that the profile center of the lens group is concentric with the rotating axis of the rotating platform, guarantee the accuracy of eccentricity detection, are convenient to implement, simple in structure, and improve the overall efficiency of eccentricity detection. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a structural schematic view of the eccentricity detection compensation mechanism;

[0020] Figure 2 Fig. 2 is a structural schematic view of the other side of the eccentricity detection compensation mechanism;

[0021] Figure 3 Fig. 3 is a structural schematic view of the overall structure of the eccentricity detection device;

[0022] Figure 4 Fig. 4 is a structural schematic view of the rotating platform provided with the eccentricity detection compensation mechanism;

[0023] Figure 5 Fig. 5 is a structural schematic view of the eccentricity detector;

[0024] Figure 6 Fig. 6 is a schematic view of the principle of concentric adjustment;

[0025] Figure 7 Fig. 7 is a schematic view of the principle of embodiment two.

[0026] Wherein:

[0027] Clamping mechanism 1, positioning piece 11, movable piece 12, positioning edge 13, clamping surface 14, carrier base 15, displacement sensor 2, adjustment mechanism 3, first linear adjustment assembly 31, second linear adjustment assembly 32, rotating platform 4, servo motor 41, air bearing 42, rotary table 43, rotating drag chain 44, eccentricity detector 5, optical system 51, lifting assembly 52, marble platform 6, lens group 7, eccentricity detection compensation mechanism 8. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0029] The eccentricity detection compensation mechanism disclosed in the embodiments of the present application can be accurately, conveniently and efficiently adjusted, ensures that the profile centers of lens groups with different outer diameters are accurately concentric with the rotation axis of the rotating platform, effectively improves the overall detection efficiency, and guarantees the accuracy of the eccentricity detection result.

[0030] Embodiment one

[0031] As shown in Figure 1 and Figure 2 , an eccentricity detection compensation mechanism mainly comprises a clamping mechanism 1, a displacement sensor 2 and an adjustment mechanism 3. The clamping mechanism 1 is used for positioning and clamping a lens group to be subjected to eccentricity detection. The clamping mechanism 1 mainly comprises a positioning piece 11 and a movable piece 12. Two positioning edges 13 are arranged on the positioning piece 11. The two positioning edges 13 have a preset included angle therebetween and form a V-shaped groove structure. The movable piece 12 moves along the angle bisector direction of the included angle of the two positioning edges 13 to clamp and fix the lens group between the movable piece 12 and the two positioning edges 13. Specifically, the clamping mechanism 1 further comprises a carrier base 15. The positioning piece 11 is fixedly arranged on the carrier base 15. The opening direction of the V-shaped groove formed by the two positioning edges 13 is along the surface direction of the carrier base 15. The movable piece 12 moves along the surface direction of the carrier base 15 to clamp the lens group 7 placed on the carrier base 15 between the movable piece 12 and the two positioning edges 13.

[0032] The outer periphery contour of the lens group is circular as a whole, and specifically includes two forms, one is a three-segment circular arc form, and the other is a complete circular form. The three-segment circular arc form specifically refers to that the outer periphery contour of the lens group includes three segments of circular arcs on the same circumference. The complete circular form specifically refers to that the outer periphery contour of the lens group is a complete circle. In order to adapt to the two types of lens groups, the clamping structure of the three-point contact mode is adopted in the embodiment, which has good flexibility and adaptability, and can ensure stable clamping. Specifically, the movable part 12 has a clamping surface 14 perpendicular to the angle bisector direction of the V-shaped groove formed by the two positioning edges 13. The clamping surface 14 cooperates with the two positioning edges 13 to clamp and fix the lens group in a three-point contact mode, that is, the outer periphery contour of the lens group is tangent to the two positioning edges 13 and the clamping surface 14 at the same time. Since the clamping surface 14 is perpendicular to the angle bisector direction of the V-shaped groove, the contact point of the clamping surface 14 and the outer periphery contour of the lens group is exactly on the angle bisector of the V-shaped groove. The displacement sensor 2 measures the position data of the movable part 12, and then the contour center position data of the lens group can be obtained by calculation. Specifically, the displacement sensor 2 measures the position data of the clamping surface 14 on the angle bisector of the V-shaped groove, in other words, the position data of the contact point of the clamping surface 14 and the outer periphery contour of the lens group. After obtaining the position data, the contour center position data of the lens group can be calculated. The displacement sensor 2 specifically adopts a contact sensor. The displacement sensor 2 is in stable contact with the clamping surface 14, so that the data obtained by the displacement sensor 2 is the position data of the contact point of the clamping surface 14 and the outer periphery contour of the lens group. There is no need to convert the data, and the contour center position data of the lens group can be obtained by simple calculation.

[0033] Of course, the movable part 12 can also have other shapes, for example, a second V-shaped groove is arranged on the movable part 12, and the angle bisector of the second V-shaped groove coincides with the angle bisector of the V-shaped groove formed by the two positioning edges 13 on the positioning part 11. The movable part 12 can also cooperate with the positioning part 11 to effectively position and clamp the lens group. The contour center position data of the lens group can also be calculated by measuring the position data of the movable part 12, but the calculation is a little more complex compared with the previous method.

[0034] The movable part 12 can be driven by a magnetic part or an elastic part to move along the angle bisector direction of the V-shaped groove, the force direction of the magnetic part or the elastic part is towards the positioning part, automatically realizing clamping of the lens group, the magnetic part can be a magnetic component with magnetic attraction arranged between the movable part 12 and the positioning part 11, or a magnetic component with magnetic repulsion arranged between the movable part 12 and the carrier base 15 to drive the movable part 12 to move towards the positioning part 11, the elastic part can be a spring arranged between the movable part 12 and the carrier base 15 to drive the movable part 12 to move towards the positioning part 11, which is more convenient for clamping and fixing the lens group; the movable part 12 can also be driven by a linear adjustment mechanism to move along the angle bisector direction of the V-shaped groove, the linear adjustment mechanism includes a gas cylinder, an electric push rod, a screw adjustment mechanism, etc., which can drive the movable part 12 to move accurately and control the clamping force on the lens group with different outer diameters, avoid deformation or damage of the lens group caused by excessive clamping force, and ensure the integrity of the lens group and the accuracy of the eccentricity detection result, in this embodiment, a gas cylinder is used, which has simple structure, convenient implementation, low cost and can ensure the reliability of clamping and fixing the lens group.

[0035] The clamping mechanism 1 is arranged on the adjustment mechanism 3 and moved by the adjustment mechanism 3, the adjustment mechanism 3 includes a first linear adjustment assembly 31 along the angle bisector direction of the V-shaped groove formed by the two positioning edges 13, the adjustment mechanism 3 is arranged on the rotating platform 4 of the eccentricity detection device, so that the adjustment mechanism 3 adjusts the position of the clamping mechanism 1 relative to the rotating platform 4, that is, adjusts the position of the lens group relative to the rotating platform 4, and then makes the contour center of the lens group concentric with the rotation axis of the rotating platform, which ensures accurate eccentricity detection.

[0036] The angle bisector direction of the V-shaped groove formed by the two positioning edges 13 is designed to pass through the rotation axis of the rotating platform 4, so that when the lens group 7 is clamped between the positioning member and the movable member, the contour center of the lens group 7 only has a deviation amount along the angle bisector direction of the V-shaped groove relative to the rotation axis of the rotating platform 4, and then only the position of the lens group 7 needs to be adjusted along the angle bisector direction of the V-shaped groove to make the contour center of the lens group 7 and the rotation axis of the rotating platform 4 reach the concentric state, so only one linear adjustment degree of freedom is needed to realize the centering, in other words, the adjustment mechanism 3 only needs to be provided with a first linear adjustment assembly 31 along the angle bisector direction of the V-shaped groove to meet the adjustment requirement, in order to improve the adjustment accuracy and use convenience, the first linear adjustment assembly 31 adopts an electric assembly to automatically adjust according to the position data obtained by the displacement sensor 2, without manual adjustment, reducing the labor intensity and improving the adjustment efficiency, specifically, the first linear adjustment assembly 31 is composed of a stepping motor and an electric precision sliding table, which is smooth and accurate in adjustment, ensures that the contour center of the lens group 7 and the rotation axis of the rotating platform 4 reach a high-precision concentric state, and guarantees the accuracy of the eccentric detection of the lens group 7.

[0037] Due to assembly errors or wear errors caused by long-term use, the angle bisector direction of the V-shaped groove formed by the two positioning edges 13 may not pass through the actual rotation axis of the rotating platform, therefore the adjustment mechanism 3 in the embodiment is also provided with a second linear adjustment assembly 32 perpendicular to the angle bisector direction of the V-shaped groove, which is used for compensation to ensure that the angle bisector direction of the V-shaped groove passes through the rotation axis of the rotating platform, the first linear adjustment assembly 31 is specifically arranged on the rotating platform 4, the second linear adjustment assembly 32 is arranged on the first linear adjustment assembly 31 and is moved by the first linear adjustment assembly 31, and the clamping mechanism 1 is further connected to the second linear adjustment assembly 32, the movement directions of the first linear adjustment assembly 31 and the second linear adjustment assembly 32 are both perpendicular to the rotation axis of the rotating platform 4, that is, the adjustment mechanism 3 drives the lens group 7 to move in a two-dimensional plane perpendicular to the rotation axis of the rotating platform 4, the first linear adjustment assembly 31 needs to frequently perform adjustment actions, as long as the lens group with different outer diameter sizes is replaced, the first linear adjustment assembly 31 needs to perform adjustment actions, and the second linear adjustment assembly 32 only needs to ensure that the angle bisector direction of the V-shaped groove formed by the two positioning edges 13 passes through the rotation axis of the rotating platform, and then is fixed, so that the state of the angle bisector direction of the V-shaped groove formed by the two positioning edges 13 will not be changed when the lens group with different outer diameter sizes is replaced, thereby the second linear adjustment assembly 32 does not need to frequently perform adjustment actions, and the second linear adjustment assembly 32 adopts a manual adjustment compact sliding table, which has a more compact structure and reduces the cost.

[0038] AsFigures 3 to 5 As shown in the figure, the eccentricity detection device mainly comprises an eccentricity detector 5, a rotating platform 4 and the above-mentioned eccentricity detection compensation mechanism 8, and the eccentricity detection compensation mechanism 8 is arranged on the rotating platform 4 of the eccentricity detection device.

[0039] The eccentricity detector 5 specifically adopts a reflective eccentricity detector, which specifically comprises an optical system 51 and a lifting assembly 52, the optical system 51 is installed on the lifting assembly 52 and is driven by the lifting assembly 52 to move up and down, the lifting assembly 52 specifically comprises a stepping motor and a linear slide rail mechanism, and the optical system 51 moves up and down along the linear slide rail mechanism to ensure the accuracy of height adjustment of the optical system 51.

[0040] The rotating platform 4 comprises a servo motor 41, an air bearing 42 and a turntable 43, the servo motor 41 is connected with the air bearing 42 through a shaft coupling, the turntable 43 is connected with the rotor of the air bearing 42, the servo motor 41 drives the turntable 43 to rotate stably and smoothly through the air bearing 42, the rotation axis of the turntable 43 is along the vertical direction, the adjustment mechanism 3 of the eccentricity detection compensation mechanism is arranged on the table top of the turntable 43, the adjustment mechanism 3 adjusts the position of the clamping mechanism 1 so that the lens group placed on the clamping mechanism 1 can reach a concentric state with the turntable 43, the displacement sensor 2 of the eccentricity detection compensation mechanism is fixed on the turntable 43 through a support, the position data of the clamping surface 14 on the movable part 12 relative to the turntable 43 is measured by using the displacement sensor 2, the displacement sensor 2 can also be arranged on the carrier base 15, the position data of the clamping surface 14 on the movable part 12 relative to the carrier base 15 is measured by using the displacement sensor 2, and the position data of the profile center of the lens group 7 can also be obtained by calculation, and then the position of the lens group 7 is adjusted so that the profile center of the lens group 7 is concentric with the rotation axis of the rotating platform 4.

[0041] The rotating platform 4 is further provided with a rotating drag chain 44, and the cables, air pipes and the like connected with the eccentricity detection compensation mechanism are arranged along the rotating drag chain 44, which can effectively protect the cables and air pipes and avoid affecting the rotating work of the rotating platform 4, the rotating range of the rotating platform 4 is more than 400 degrees, which can completely cover a circumference and ensure the accuracy of eccentricity detection. In order to further improve the accuracy of eccentricity detection, the eccentricity detector 5 and the rotating platform 4 need to be placed on a stable base to avoid the influence of shaking, vibration, deformation and the like on the detection accuracy, and the eccentricity detection device further comprises a marble platform 6, the marble platform 6 has high structural strength and good stability and is not easy to deform, thereby providing a stable base for detection, the marble platform 6 is arranged on a rack, and the eccentricity detector 5 and the rotating platform 4 are arranged on the marble platform 6, which can ensure that the eccentricity detector 5 and the rotating platform 4 work stably and reliably and avoid the influence of external factors on the detection accuracy.

[0042] The eccentricity detection device described in the embodiment adjusts the position of the lens group by using the eccentricity detection compensation mechanism, so that the eccentricity value of the lens group measured by the eccentricity detector 5 can meet the eccentricity measurement of lens groups with different external sizes.

[0043] The specific centering method of the eccentricity detection device described in the embodiment includes:

[0044] Step one: first calibrate the zero point position of the contact sensor 32 by using a standard lens, which is a standard component with the center of its outer circle concentric with the spherical center of its surface. Place the standard lens in the angle area between the two positioning edges 13 of the positioning member 11, and drive the movable member 12 to clamp the standard lens by the air cylinder. Adjust the first linear adjustment assembly 31 and the second linear adjustment assembly 32 of the adjustment mechanism 3 to adjust the position of the standard lens, so that the center of the outer circle of the standard lens is approximately concentric with the rotation axis of the rotating platform. Then drive the rotating platform 43 to rotate one revolution by the servo motor 41, and measure the eccentricity value at this time by the eccentricity detector 5. Then adjust the adjustment mechanism 3 according to the eccentricity value for fine adjustment. Repeat the above steps until the eccentricity value measured by the eccentricity detector 5 is less than the preset value, and finally make the center of the outer circle of the standard lens coincide with the rotation axis of the rotating platform. Then record the data of the displacement sensor 2 at this time as the standard data L1, and set it as the zero point. Then take out the standard lens from the clamping mechanism 1;

[0045] Step two: place the lens group 7, and drive the movable member 12 to clamp the standard lens group 7 by the air cylinder. At this time, the data of the displacement sensor 2 is the comparison data L2. According to the included angle between the two positioning edges 13 and the standard data and the comparison data, calculate the deviation value of the profile center of the lens group 7 relative to the center of the outer circle of the standard lens (i.e. the rotation axis of the rotating platform). Then fine adjust the first linear adjustment assembly 31 according to the deviation value, so that the profile center of the lens group coincides with the rotation axis of the rotating platform.

[0046] Step three: drive the optical system 51 up and down by the lifting assembly 52 of the eccentricity detector 5 until the focal point of the lens group 7 is found. Drive the rotating platform 43 to rotate one revolution by the servo motor 41, and measure the eccentricity value of the lens group 7 by the eccentricity detector 5.

[0047] After the zero point is determined by step one, steps two and three can be continuously performed on lens groups 7 with different external diameters to measure the eccentricity. Step one does not need to be performed every time, and only the data L1 as the zero point can be used to adjust the concentricity of lens groups 7 with different external diameters, effectively reducing the operation steps and improving the overall efficiency of eccentricity detection.

[0048] The principle of concentric adjustment is as follows: Figure 6As shown, AB and AC are two positioning edges 13, and the standard lens or lens group is clamped and fixed, and the standard lens or lens group is in contact with AB and AC at the same time, and the clamping surface 14 is also in contact with the standard lens or lens group, and the data L1 measured by the displacement sensor 2 is the position data of the contact point of the clamping surface 14 and the standard lens in the direction of the angle bisector of the angle between the two positioning edges 13, and the data L2 measured by the displacement sensor 2 is the position data of the contact point of the clamping surface 14 and the lens group in the direction of the angle bisector of the angle between the two positioning edges 13.

[0049] Suppose the angle between the two positioning edges 13 is θ;

[0050] Then the center position of the outer circle of the standard lens is O1=R1×csc(θ / 2), and R1 is the radius of the standard lens.

[0051] And the center position of the contour of the lens group is O2=R2×csc(θ / 2), and R2 is the radius of the lens group.

[0052] Therefore, the deviation value between the contour center of the lens group and the center of the outer circle of the standard lens (i.e. the rotation axis of the rotating platform) is

[0053] O2-O1=(R2-R1)×csc(θ / 2);

[0054] And L2-L1=(O2-O1)+(R2-R1)=(O2-O1)+(O2-O1) / csc(θ / 2);

[0055] Therefore, O2-O1=(csc(θ / 2) / (1+csc(θ / 2)))×(L2-L1) can be obtained.

[0056] O2-O1 is the adjustment amount required by the first linear adjustment assembly 31, that is, only L2 and L1 need to be measured to calculate the adjustment amount, and the radius values of the standard lens and the lens group do not need to be known, the calculation involves fewer parameters, and the calculation is convenient and simple.

[0057] The included angle of the two positioning edges 13 is preferably in the range of 60°-120°, and 60° is preferably used to achieve the best positioning effect and adapt to the three-arc peripheral contour of the lens group. When the included angle of the two positioning edges 13 is 60°, O2-O1=2×(L2-L1) / 3, the data L1 recorded by the displacement sensor 2 is the data when the center of the outer circle of the standard lens and the rotation axis of the rotating platform are in a concentric state. When the lens group is placed in a lens group with a different outer diameter, the displacement sensor 2 can conveniently measure the data L2 of the lens group, and then the deviation value of the contour center of the lens group 7 relative to the rotation axis of the rotating platform can be calculated. The first linear adjustment assembly 31 automatically acts according to the deviation value to achieve concentric adjustment, which is convenient and efficient and ensures that the subsequent eccentricity measurement is accurate and reliable.

[0058] Embodiment Two

[0059] As shown in Figure 7 , the difference from embodiment one is that the movable part 12 moves along the direction of the straight line where one of the two positioning edges 13 is located. Specifically, the movable part 12 moves along the AC direction, and the clamping surface 14 of the movable part 12 is perpendicular to the AC direction. The clamping surface 14 of the movable part 12 can also clamp and fix the standard lens and the lens group together with the two positioning edges 13. That is, when the standard lens and the lens group are clamped and fixed, they are in contact with AB and AC at the same time, and the clamping surface 14 is also in contact with the standard lens and the lens group. The displacement sensor 2 measures the position data of the movable part 12 along the AC direction, which is the position data of the contact point of the clamping surface 14 and the standard lens and the lens group in the AC direction;

[0060] As can be seen from Figure 7 ,

[0061] The center position of the outer circle of the standard lens is O1=R1×csc(θ / 2), and R1 is the radius of the standard lens.

[0062] The contour center position of the lens group is O2=R2×csc(θ / 2), and R2 is the radius of the lens group.

[0063] Therefore, the deviation value of the contour center of the lens group and the center of the outer circle of the standard lens (i.e., the rotation axis of the rotating platform) is

[0064] O2-O1=(R2-R1)×csc(θ / 2);

[0065] And L2-L1=(O2xcos(θ / 2)+R2)-(O1xcos(θ / 2)+R1)=(O2-O1)xcos(θ / 2)+(R2-R1)=(O2-O1)xcos(θ / 2)+(O2-O1) / csc(θ / 2)=(O2-O1)xcos(θ / 2)+(O2-O1)xs in(θ / 2);

[0066] Thus, O2-O1=(L2-L1) / (cos(θ / 2)+s in(θ / 2)) can be obtained;

[0067] O2-O1 is the adjustment amount of the first linear adjustment assembly 31, and the adjustment amount can be calculated by measuring L2 and L1, without the need to know the exact radius of the standard lens and the lens group, and the calculation involves fewer parameters, and is convenient and simple.

[0068] The data L1 recorded by the displacement sensor 2 is the data when the center of the outer circle of the standard lens and the rotation axis of the rotating platform are concentric, and when the lens group with different outer diameters is placed, the displacement sensor 2 can conveniently measure the data L2 of the lens group, and then the deviation of the profile center of the lens group 7 relative to the rotation axis of the rotating platform can be obtained, and the first linear adjustment assembly 31 automatically acts according to the deviation to realize concentric adjustment, which is convenient and efficient, and ensures the accuracy and reliability of subsequent eccentricity measurement.

[0069] The above is only a preferred embodiment of the present application, and it should be pointed out that the above preferred embodiment should not be regarded as a limitation of the present application, and the protection scope of the present application should be limited by the scope defined by the claims. For ordinary skilled in the art, several improvements and refinements can be made without departing from the spirit and scope of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An eccentricity detection compensation mechanism characterized by comprising: The device comprises a clamping mechanism (1), a displacement sensor (2) and an adjusting mechanism (3), the clamping mechanism (1) comprises a positioning member (11) and a movable member (12), the positioning member (11) is provided with two positioning edges (13), the two positioning edges (13) have a preset included angle, the movable member (12) moves along a preset moving direction to make the lens group (7) be clamped and fixed against the two positioning edges (13) and the movable member (12), the displacement sensor (2) measures the position data of the movable member (12), the clamping mechanism (1) is arranged on the adjusting mechanism (3) and is driven by the adjusting mechanism (3) to move, and the adjusting mechanism (3) comprises a first linear adjusting assembly (31) along the angle bisector direction of the included angle of the two positioning edges (13).

2. The eccentricity detection compensation mechanism according to claim 1, characterized by The preset moving direction is the angle bisector direction of the included angle of the two positioning edges (13), or the preset moving direction is the straight line direction in which one of the positioning edges (13) is located.

3. The eccentricity detection compensation mechanism according to claim 1, characterized by The movable member (12) is provided with a clamping surface (14) which is perpendicular to the preset moving direction of the movable member (12), and the clamping surface (14) cooperates with the two positioning edges (13) to clamp and fix the lens group in a three-point contact mode.

4. The eccentricity detection compensation mechanism according to claim 1, characterized by The first linear adjusting assembly (31) adopts an electric assembly to automatically adjust according to the position data obtained by the displacement sensor (2).

5. The eccentricity detection compensation mechanism according to claim 1, characterized by, When the lens group (7) is clamped and fixed, the profile center of the lens group (7) is located on the angle bisector of the included angle of the two positioning edges (13).

6. An eccentricity detecting device characterized by comprising: The eccentricity detection compensation mechanism comprises the eccentricity detection compensation mechanism according to any one of claims 1 to 5, and the eccentricity detection compensation mechanism is arranged on a rotating platform (4) of an eccentricity detection device.

7. The eccentricity detecting device according to claim 6, characterized by The rotating platform (4) is provided with a rotating drag chain (44).

8. A method of aligning the eccentricity detection device of claim 6 or 7, characterized by the steps of The device comprises: Step one, a standard lens is clamped and fixed by the clamping mechanism (1), the adjusting mechanism (3) is actuated to make the outer circle center of the standard lens be concentric with the rotating shaft of the rotating platform (4), and the data of the displacement sensor (2) at this time is recorded as standard data; Step two, a lens group (7) is clamped and fixed by the clamping mechanism (1), the data of the displacement sensor (2) at this time is recorded as to-be-compared data, the deviation value of the profile center of the lens group (7) relative to the outer circle center of the standard lens is calculated according to the included angle between the two positioning edges (13), the standard data and the to-be-compared data, and the adjusting mechanism (3) is actuated according to the deviation value to make the profile center of the lens group be concentric with the rotating shaft of the rotating platform.

9. The method of aligning according to claim 8, wherein, In the step one, after the standard lens is clamped and fixed by the clamping mechanism (1), the rotating platform (4) of the eccentricity detection device rotates one circle, the eccentricity detector (5) of the eccentricity detection device measures the current eccentricity, the adjusting mechanism (3) is adjusted according to the eccentricity, and the above steps are repeated until the eccentricity measured by the eccentricity detector (5) is less than a preset value, so that the outer circle center of the lens is concentric with the rotating shaft of the rotating platform (4), and then the data of the displacement sensor (2) at this time is recorded as standard data.

10. The method of aligning according to claim 8, wherein, The deviation value of the profile center of the lens group (7) relative to the outer circle center of the standard lens is O2-O1=(csc(θ / 2) / (1+csc(θ / 2)))×(L2-L1), wherein O2 is the profile center position of the lens group (7), O1 is the outer circle center position of the standard lens, θ is the included angle between the two positioning edges (13), L2 is the to-be-compared data, and L1 is the standard data.

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