Turning device and turning method

Abstract

An embodiment of the present invention provides a turning device and a turning method. The turning device is used for processing a lens assembly. The lens assembly includes a lens frame and lenses mounted on the lens frame. The turning device includes a bed, a first support, a second support, a third support, a main shaft, a center deviation measuring instrument, and a tool. The main shaft is connected to the lens assembly and drives the lens assembly to rotate with the main shaft as the rotation axis. The main shaft is mounted on the first support and can rotate relative to the central axis of the main shaft. The center deviation measuring instrument is used to measure the spatial position relationship between the optical axis of the lens and the main shaft, and establish a three-dimensional turning trajectory of the lens assembly. The tool is used to turn the lens frame under the three-axis servo linkage of the main shaft, the first support, and the third support according to the three-dimensional turning trajectory.

Description

Technical Field

[0001] The present invention relates to the technical field of optical system integration, and particularly to a turning device and a turning method. Background Art

[0002] With the progress of science and technology, the requirements for optical systems in various fields are getting higher and higher. For example, with the continuous demand for high throughput and low cost in the gene sequencing fluorescence microscopy system, the technical indicators such as the resolution, field of view, focal length error, and distortion of the fluorescence microscope objective lens are required to be higher and higher. Therefore, more stringent control of errors in optical design, optical processing, opto-mechanical integration, etc. is needed. Among them, the eccentricity and air gap tolerance of the optical system are important indicators of opto-mechanical integration, and high-precision integration performance and high-efficiency integration speed are required.

[0003] The current turning method requires first adjusting the coaxiality of the optical axis and the machine tool spindle under the detection of a center deviation measuring instrument, and then performing centering turning processing in the spindle mode. In the spindle mode, the rotation of the rotating shaft and the linear movement of the workpiece table are independent of each other. Therefore, the spindle mode is a working mode that only needs to control the rotation speed of the rotating shaft without controlling its angular position. In addition, the current turning method needs to experience cumbersome adjustments of the optical axis of the lens in the horizontal and inclined directions. At the same time, after the adjustment, a fixture needs to be clamped to ensure sufficient stiffness, and the clamping force will cause deviation of the optical axis of the lens. The adjustment error and the error introduced by clamping will directly affect the centering turning accuracy of the lens assembly. Summary of the Invention

[0004] In a first aspect of the present invention, a turning device is provided for processing a lens assembly, the lens assembly including a lens frame and a lens mounted on the lens frame. The turning device includes:

[0005] A bed;

[0006] A first support member, the first support member being mounted on the bed and supporting the lens assembly;

[0007] A second support member, a center deviation measuring instrument being mounted on the second support member. At least one of the first support member and the second support member can linearly move relative to the bed in a first direction to adjust the distance between the lens assembly and the center deviation measuring instrument in the first direction;

[0008] A third support member, the third support member and the second support member being located on the same side of the first support member, a cutting tool being mounted on the third support member, at least one of the third support member and the first support member being capable of linearly moving relative to the bed along the first direction to adjust the distance between the lens assembly and the cutting tool in the first direction, at least one of the third support member and the first support member being capable of linearly moving relative to the bed along a second direction different from the first direction to adjust the distance between the cutting tool and the lens assembly in the second direction; and

[0009] A main shaft, the main shaft being connected to the lens assembly and driving the lens assembly to rotate about the main shaft as a rotation axis, the main shaft being mounted on the first support member and being rotatable about the central axis of the main shaft;

[0010] And an angle encoder for controlling the rotation angle of the main shaft;

[0011] Wherein, the center deviation measuring instrument is used to measure the spatial position relationship between the optical axis of the lens and the main shaft, and establish a three-dimensional turning trajectory of the lens assembly; the cutting tool is used to turn the lens frame under the three-axis servo linkage of the main shaft, the first support member and the third support member according to the three-dimensional turning trajectory.

[0012] The turning device first establishes a three-dimensional turning trajectory of the lens assembly through a center deviation measuring instrument, and then realizes centering turning of the lens assembly in a three-axis servo linkage manner of the main shaft, the first support member and the third support member. The whole process can realize centering turning without adjusting the lens frame connecting piece to make the optical axis of the lens and the main shaft of the machine tool coaxial. In addition, since there is no need to adjust the lens frame connecting piece to make the optical axis of the lens and the main shaft of the machine tool coaxial, the influence of adjustment error and clamping-introduced error on the centering turning accuracy in the traditional centering turning technology is avoided.

[0013] A second aspect of the present invention further provides a turning method for machining a lens assembly, the lens assembly including a lens frame and a lens mounted on the lens frame, which includes:

[0014] Providing the above-mentioned turning device and mounting the lens assembly on the main shaft;

[0015] Measuring the spatial position relationship between the optical axis of the lens and the main shaft, and establishing a three-dimensional turning trajectory of the lens assembly;

[0016] Turning the lens frame under the three-axis servo linkage of the main shaft, the first support member and the third support member according to the three-dimensional turning trajectory.

[0017] For the turning method described above, first, by measuring the spatial position relationship between the optical axis of the lens and the main axis, a three-dimensional turning trajectory of the lens assembly is established. Then, centering turning of the lens assembly is achieved through the three-axis servo linkage of the main axis, the first support, and the third support. The entire process can achieve centering turning without adjusting the frame connecting piece to make the optical axis of the lens and the main axis of the machine tool coaxial. Additionally, since there is no need to adjust the frame connecting piece to make the optical axis of the lens and the main axis of the machine tool coaxial, the influence of adjustment errors and clamping-introduced errors on the centering turning accuracy in traditional centering turning technology is avoided. Brief Description of the Drawings

[0018] Figure 1 FIG. is a schematic structural diagram of the turning device according to an embodiment of the present invention at the measurement station.

[0019] Figure 2 is Figure 1 the schematic structural diagram of the turning device at the processing station.

[0020] Figure 3 FIG. is a schematic diagram of the centering principle of the lens assembly.

[0021] Figure 4 FIG. is an imaging optical path diagram when the measured surface is the k-th optical surface.

[0022] Figure 5 is Figure 1 the partial structural diagram of the turning device in FIG.

[0023] Figure 6 FIG. is a schematic flowchart of the turning method according to an embodiment of the present invention.

[0024] Main Element Symbol Description

[0025] Turning device 100

[0026] First support 10

[0027] Second support 20

[0028] Third support 30

[0029] Main axis 40

[0030] Center deviation measuring instrument 50

[0031] Focusing objective lens 522

[0032] Collimating objective lens 524

[0033] Autocollimator 52

[0034] Beam splitter 542

[0035] Camera 56

[0036] Tool 60

[0037] Tool shank 62

[0038] Rear tool 64

[0039] Front tool 66

[0040] Frame connector 70

[0041] Lens assembly 80

[0042] Frame 82

[0043] Front end face 822

[0044] Rear end face 824

[0045] Outer cylindrical surface 826

[0046] Lens 84

[0047] Topmost surface 842

[0048] Lowermost surface 844

[0049] First direction D1

[0050] Second direction D2

[0051] Bed 90

[0052] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used herein in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0055] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following detailed description of the present invention is made in conjunction with the drawings and preferred embodiments.

[0056] Figure 1 And Figure 2 Are respectively schematic structural diagrams of the turning device 100 of an embodiment of the present invention at the measurement station and the machining station. The turning device 100 is used to machine the lens assembly 80. As Figure 1 AndFigure 2 As shown, the turning device 100 includes a bed 90, a first support member 10 mounted on the bed 90, a second support member 20 mounted on the bed 90, a third support member 30 mounted on the bed 90, a spindle 40 mounted on the first support member 10, a center deviation measuring instrument 50 mounted on the second support member 20, and a tool 60 mounted on the third support member 30. The third support member 30 and the second support member 20 are located on the same side of the first support member 10. The first direction D1 is perpendicular to the second direction D2. Preferably, the first direction D1 is parallel to the central axis of the center deviation measuring instrument 50. At least one of the first support member 10 and the second support member 20 can linearly move relative to the bed 90 along the first direction D1 to adjust the distance between the lens assembly 80 and the center deviation measuring instrument 50 in the first direction D1. At least one of the third support member 30 and the first support member 10 can linearly move relative to the bed 90 along the first direction D1 to adjust the distance between the lens assembly 80 and the tool 60 in the first direction D1. At least one of the third support member 30 and the first support member 10 can linearly move relative to the bed 90 along the second direction D2 to adjust the distance between the tool 60 and the lens assembly 80 in the second direction D2. Preferably, the first support member 10, the second support member 20, and the third support member 30 are all movable axes in a numerically controlled machine tool that can move relative to the bed 90.

[0057] In some embodiments, the first support member 10 is movably connected to the bed 90 and drives the lens assembly 80 and the spindle 40 to linearly move along the first direction D1 and / or linearly move along the second direction D2. The third support member 30 is movably connected to the bed 90 and drives the tool 60 to linearly move along the first direction D1 and / or linearly move along the second direction D2. The second support member 20 is movably connected to the bed 90 and drives the center deviation measuring instrument 50 to linearly move along the first direction D1. That is to say, the first support member 10 can not only linearly move along the first direction D1 to adjust the distance between the lens assembly 80 and the center deviation measuring instrument 50 in the first direction D1 or adjust the distance between the lens assembly 80 and the tool 60 in the first direction D1, but also linearly move along the second direction D2 to adjust the distance between the lens assembly 80 and the tool 60 in the second direction D2. In addition, the third support member 30 can not only linearly move along the first direction D1 to adjust the distance between the lens assembly 80 and the tool 60 in the first direction D1, but also linearly move along the second direction D2 to adjust the distance between the tool 60 and the lens assembly 80 in the second direction D2.

[0058] The turning device 100 further includes a lens frame connecting member 70. The lens frame connecting member 70 is fixedly installed on the first support member 10, and the lens assembly 80 is installed and fixed on the main shaft 40 through the lens frame connecting member 70. The main shaft 40 has an angular position positioning function. The main shaft 40 is connected to the lens assembly 80 and drives the lens assembly 80 to rotate synchronously around the axis of the main shaft 40, and the main shaft 40 can rotate around its central axis. The rotation angle is controlled by an angle encoder.

[0059] That is, the main shaft 40 can rotate around its central axis as the axis of self-rotation, and can also rotate around Figure 3 the L axis parallel to the first direction D1. The rotation angle is controlled by the controller of the main shaft 40 through the angle encoder, and the angle encoder is connected to the controller.

[0060] The lens assembly 80 includes a lens frame 82 and a lens 84 installed on the lens frame 82. The center deviation measuring instrument 50 is used to measure the spatial position relationship between the optical axis of the lens 84 and the main shaft 40, and establish the three-dimensional turning trajectory of the lens assembly 80. The tool 60 is used to turn the lens frame 82 under the three-axis servo linkage of the main shaft 40, the first support member 10 and the third support member 30 according to the three-dimensional turning trajectory. The turning device 100 first establishes the three-dimensional turning trajectory of the lens assembly 80 through the center deviation measuring instrument 50, and then realizes the centering turning of the lens assembly 80 by means of the three-axis slow tool servo linkage of the main shaft 40, the first support member 10 and the third support member 30. The entire process can achieve centering turning without adjusting the lens frame connecting member 70 to make the optical axis of the lens 84 coaxial with the main shaft 40 of the machine tool. In addition, since there is no need to adjust the lens frame connecting member 70 to make the optical axis of the lens 84 coaxial with the main shaft 40 of the machine tool, the influence of the adjustment error and the error introduced by clamping in the traditional centering turning technology on the centering turning accuracy is avoided.

[0061] The turning device 100 further includes a controller (not shown in the figure). The controller is electrically connected to the first support member 10, the second support member 20, the third support member 30 and the main shaft 40 to control the linear movement of the first support member 10, the second support member 20, the third support member 30 and the rotation of the main shaft 40. The controller is, for example, a single-chip microcomputer control system.

[0062] As Figure 1 shown, the controller controls the first support member 10 to move along the second direction D2. When the main shaft 40 is opposite to the center deviation measuring instrument 50, the lens assembly 80 is located at the measuring station. Among them, the controller controls the rotation of the main shaft 40 of the turning device 100, and cooperates with the movement of the second support member 20 in the first direction D1. The center deviation measuring instrument 50 measures the spatial position relationship between the optical axis of the lens 84 and the main shaft 40, and establishes the three-dimensional turning trajectory of the lens assembly 80 in the machine tool coordinate system.

[0063] As Figure 2As shown, the controller controls the first support member 10 to move along the second direction D2. When the main shaft 40 faces the tool 60, the lens assembly 80 is located at the machining station. According to the three-dimensional turning trajectory, the tool 60 turns the spectacle frame 82 under the three-axis servo linkage of the main shaft 40, the first support member 10, and the third support member 30. Among them, the controller controls the main shaft 40 to rotate, the first support member 10 to move along the second direction D2, and the third support member 30 to move along the first direction D1, so that the tool 60 can turn the end face and the outer surface of the spectacle frame 82 under the three-axis slow tool servo linkage of the main shaft 40, the first support member 10, and the third support member 30.

[0064] The centering principle of the lens assembly 80 will be described below in conjunction with Figure 3 and Figure 4 . As shown in Figure 3 , the center deviation measuring instrument 50 includes a focusing objective lens 522, a collimating objective lens 524, a beam splitter 542, and a camera 56 arranged in sequence. The autocollimator 52 includes a collimating objective lens 524, a beam splitter 542, a camera 56, and a light source (not shown in the figure). When the lens assembly 80 is located at the measuring station, the focusing objective lens 522 is closer to the lens assembly 80 than the camera 56. The surface of the lens 84 closest to the center measuring instrument is defined as the uppermost surface 842, and the surface of the lens 84 farthest from the center measuring instrument is defined as the lowermost surface 844. Measuring the spatial position relationship between the optical axis of the lens 84 and the main shaft 40 includes measuring the spherical center coordinates of the uppermost surface 842 and the lowermost surface 844 of the lens 84 and obtaining the eccentricity and tilt amount of the optical axis of the lens 84 relative to the main shaft 40. The camera 56 can be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) device.

[0065] In one embodiment, the spindle 40 rotation method is adopted to measure the decentration of the lens 84. Taking the spindle 40 of the turning device 100 as the measurement reference axis, after the lens assembly 80 is installed and fixed on the spindle 40, the reflected images of each optical surface are self-collimated and imaged on the camera 56. For example, when the measured surface of the lens 84 is the uppermost surface 842 of the lens 84, when the spindle 40 rotates, if there is decentration in the lens 84, the center of the sphere P of its uppermost surface 842 is not completely on the axis L of the spindle 40, and the self-collimated image Q of the center of the sphere P of the uppermost surface 842 will move in a circular motion around the axis L of the spindle 40. According to the radius d of the imaging circle of the self-collimated image Q on the camera 56, the decentration a of the center of the sphere P of the uppermost surface 842 relative to the spindle 40 is obtained through magnification conversion. Specifically, the light from the light source (not shown in the figure) in the autocollimator 52 is reflected by the beam splitter 542 and becomes parallel light after passing through the collimating objective 524. After passing through the focusing objective 522, it is focused to form a measurement light cone. After the measurement light cone is reflected by the uppermost surface 842 of the lens 84, the reflected image of the center of the sphere P of the uppermost surface 842 of the lens 84 is self-collimated and imaged on the camera 56. From Figure 3 it can be obtained that when the measured surface of the lens 84 is the uppermost surface 842 of the lens 84, the decentration line amount a of the measured surface relative to the spindle 40 forms a circular scribing amount with a radius of 2a on the focal plane of the focusing objective 522 after reflection, and its geometric relationship can be expressed as:

[0066]

[0067] In formula (1), d is the radius of the imaging circle of the self-collimated image of the center of the sphere of the measured surface on the camera 56, and f obj is the focal length of the focusing objective 522, and f autocollimator is the focal length of the autocollimator 52.

[0068] As Figure 4 shown, when the measured surface of the lens 84 is the k-th optical surface s(k) of the lens 84 and s(k) is not the uppermost surface 842 of the lens 84, it is necessary to consider the influence of parameters such as the refractive index, central thickness, and radius of curvature of the lens 84, and calculate the image point position and lateral magnification after the surface S(k) is imaged through all the mirrors on it. Taking the center of the sphere of the measured surface s(k) as the object point, after passing through the (k - 1)-th optical surface s(k - 1), according to the paraxial ray calculation formula, it can be obtained:

[0069]

[0070] In formula (2), l(k) is the distance from the center of the spherical surface s(k) to the vertex of the spherical surface s(k - 1), l(k)' is the distance from the image point of the center of the spherical surface s(k) imaged with respect to the spherical surface s(k - 1) to the vertex of the spherical surface s(k - 1), n(k) is the refractive index of the medium between the spherical surface s(k) and the spherical surface s(k - 1), n(k - 1) is the refractive index of the medium on the side of the spherical surface s(k - 1 far from the spherical surface s(k), and r(k - 1) is the radius of the spherical surface s(k - 1).

[0071] From formula (2), we can obtain:

[0072]

[0073] According to Figure 4 the geometric relationship in

[0074] l(k) = r(k) + d(k - 1) (4).

[0075] In formula (4), r(k) is the radius of the spherical surface s(k), and d(k - 1) is the distance from the vertex of the spherical surface s(k) to the vertex of the spherical surface s(k - 1).

[0076] By analogy, the geometric relationship after imaging through the spherical surface s(k - 2) can be expressed as

[0077] l(k - 1) = l(k)' + d(k - 2) (5).

[0078] In formula (5), l(k - 1) is the distance from the image point of the center of the spherical surface s(k) imaged through the spherical surfaces s(k - 1) and s(k - 2) to the vertex of the spherical surface s(k - 2), and d(k - 2) is the distance from the vertex of the spherical surface s(k - 1) to the vertex of the spherical surface s(k - 2).

[0079] By iterating formulas (3), (4), and (5), the image point position of the measured surface s(k) relative to the uppermost surface 842 can be obtained.

[0080] The relationship formula for the longitudinal magnification of the spherical surface s(k) relative to the uppermost surface 842 is:

[0081]

[0082] Therefore, the surface decentration line amount of the measured surface s(k) relative to the main axis 40 is expressed as:

[0083]

[0084] As can be seen from formula (7), by replacing different focal lengths f objThe focusing objective lens 522, combined with the guiding rail movement of the second support member 20, can achieve the measurement of various types of optical surfaces, avoiding the influence of image quality deterioration during the focusing of the internal focusing objective lens on the decentration accuracy. That is, by selecting a focusing objective lens 522 with a suitable focal length and coordinating with the linear movement of the second support member 20, it is beneficial for the center decentration measuring instrument 50 to find the autocollimation image of the measured surface, so as to measure the decentration of the measured surface relative to the main shaft 40.

[0085] As Figure 5 shown, the lens frame 82 has opposite front end faces 822 and rear end faces 824, and an outer cylindrical surface 826 connecting the front end face 822 and the rear end face 824. The cutting tool 60 includes a tool shank 62, a front tool 66 and a rear tool 64 connected to the tool shank 62. The rear tool 64 is located on the side of the front tool 66 away from the first support member 10. The front tool 66 is used for turning the front end face 822 of the lens frame 82 and the outer cylindrical surface 826 of the lens frame 82, and the rear tool 64 is used for turning the rear end face 824 of the lens frame 82. In this turning device 100, the cutting tool 60 is designed with a double tool head, which can complete the turning of the front end face 822, the outer cylindrical surface 826 and the rear end face 824 in one clamping. In addition, the front tool 66 is slightly higher than the rear tool 64, that is, the distance between the front tool 66 and the lens frame 82 is less than the distance between the rear tool 64 and the lens frame 82, so as to ensure that the rear tool 64 will not interfere when the front tool 66 turns the outer cylindrical surface 826.

[0086] It should be noted that when there is a decentration in the optical axis of the lens 84, since the optical axis of the lens 84 does not coincide with the axis of the main shaft 40 of the turning device 100, the actually turned front end face 822 and rear end face 824 of the lens frame 82 are inclined planes, and the actually turned outer cylindrical surface 826 of the lens frame 82 is an inclined cylindrical surface.

[0087] The turning device 100 includes a motor (not shown in the figure) connected to the main shaft 40 to drive the main shaft 40 to rotate and an angle encoder (not shown in the figure) connected to the motor. The motor and the angle encoder cooperate to form a closed-loop control. For example, when the servo frequency of the numerical control system is 10 kHz and the rotation angle increment is 3°, the adjustment time for each rotation angle can be controlled within 2 ms, and the rotation speed of the main shaft 40 at this time is 250 rpm. When the main shaft 40 rotates 3°, the moving distances of the first support member 10 and the third support member 30 are in the order of μm, and each adjustment time is also controlled within 2 ms.

[0088] Figure 6 It is a schematic flow chart of the turning method according to an embodiment of the present invention. This turning method uses the above-mentioned turning device 100 to process the lens assembly 80. As Figure 6 shown, this method includes the following steps.

[0089] Step S1: Measure the spatial position relationship between the optical axis of the lens 84 and the main axis 40, and establish the three-dimensional turning trajectory of the lens assembly 80.

[0090] Step S2: According to the three-dimensional turning trajectory, turn the lens frame 82 under the three-axis servo linkage of the main axis 40, the first support 10, and the third support 30.

[0091] In step S1, move the first support 10 to make the main axis 40 opposite to the centering deviation measuring instrument 50, so that the lens assembly 80 is located at the measuring station. The centering deviation measuring instrument 50 obtains the eccentricity and tilt amount of the optical axis of the lens 84 relative to the main axis 40 by measuring the spatial coordinates of the centers of the uppermost surface 842 and the lowermost surface 844 of the lens 84, and then establishes the three-dimensional trajectory of turning the lens assembly 80. In step S2, move the first support 10 to make the main axis 40 opposite to the tool 60, so that the lens assembly 80 is located at the machining station. The main axis 40 has an angular position positioning function, and the tool 60 realizes the centering turning of the lens assembly 80 in the way of three-axis slow tool servo linkage through the main axis 40, the third support 30, and the first support 10 according to the three-dimensional turning trajectory. Moreover, the tool 60 can complete the turning of the front end face 822, the outer cylindrical surface 826, and the rear end face 824 in one clamping.

[0092] The above turning method first measures the spatial position relationship between the optical axis of the lens 84 and the main axis 40, establishes the three-dimensional turning trajectory of the lens assembly 80, and then realizes the centering turning of the lens assembly 80 in the way of three-axis servo linkage of the main axis 40, the first support 10, and the third support 30. The whole process can realize centering turning without separately adjusting the lens frame connecting piece 70 to make the optical axis of the lens 84 and the main axis 40 of the machine tool coaxial. In addition, since there is no need to adjust the lens frame connecting piece 70 to make the optical axis of the lens 84 and the main axis 40 of the machine tool coaxial, the influence of the adjustment error and the error introduced by clamping on the centering turning accuracy in the traditional centering turning technology is avoided. In addition, the centering deviation measurement adopts the movement of replacing the focusing objective lens 522 and the second support 20, which overcomes the influence of the aberration introduced by the focusing of the internal focusing objective lens on the centering deviation measurement accuracy.

[0093] In addition, the above turning device 100 and turning method can be applied to, but not limited to, the eccentricity and air interval positioning of optical systems such as gene sequencing fluorescence micro-objectives and projection lithography objectives.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A turning device for machining a lens assembly, the lens assembly including a lens frame and lenses mounted on the lens frame, characterized in that, The turning device includes: A bed; A first support member, which is mounted on the bed and supports the lens assembly; A second support member, on which a center deviation measuring instrument is mounted. At least one of the first support member and the second support member can linearly move relative to the bed in a first direction to adjust the distance between the lens assembly and the center deviation measuring instrument in the first direction; A third support member, the third support member and the second support member are located on the same side of the first support member. A tool is mounted on the third support member. At least one of the third support member and the first support member can linearly move relative to the bed in the first direction to adjust the distance between the lens assembly and the tool in the first direction. At least one of the third support member and the first support member can linearly move relative to the bed in a second direction to adjust the distance between the tool and the lens assembly in the second direction, and the second direction is different from the first direction; A main shaft, which is connected to the lens assembly and drives the lens assembly to rotate with the main shaft as the rotation axis. The main shaft is mounted on the first support member and can rotate around the central axis of the main shaft; and An angle encoder, which is used to control the rotation angle of the main shaft; Wherein, the first support member is movably connected to the bed and drives the lens assembly and the main shaft to linearly move in the second direction; the third support member is movably connected to the bed and drives the tool to linearly move in the first direction; the second support member is movably connected to the bed and drives the center deviation measuring instrument to linearly move in the first direction; the center deviation measuring instrument is used to measure the spatial position relationship between the optical axis of the lens and the main shaft, and establish a three-dimensional turning trajectory of the lens assembly; the tool is used to turn the lens frame under the three-axis servo linkage of the main shaft, the first support member and the third support member according to the three-dimensional turning trajectory; The turning device further includes a controller, which is electrically connected to the first support member, the second support member, the third support member and the main shaft to control the linear movement of the first support member, the second support member, the third support member and the rotation of the main shaft; When the first support member is moved so that the main shaft is opposite to the center deviation measuring instrument, the lens assembly is located at the measuring station, and the center deviation measuring instrument measures the spatial position relationship between the optical axis of the lens and the main shaft, and establishes a three-dimensional turning trajectory of the lens assembly; When the first support member is moved so that the main shaft is opposite to the tool, the lens assembly is located at the processing station, and the tool turns the lens frame under the three-axis servo linkage of the main shaft, the first support member and the third support member according to the three-dimensional turning trajectory.

2. The turning device according to claim 1, characterized in that, The center deviation measuring instrument includes a focusing objective lens and an autocollimator. The autocollimator includes a collimating objective lens, a beam splitter, a camera, and a light source. The focusing objective lens, the collimating objective lens, the beam splitter, and the camera are arranged in sequence. When the lens assembly is located at the measuring station, the focusing objective lens is closer to the lens assembly than the camera. Define the surface of the lens closest to the center deviation measuring instrument as the uppermost surface, and define the surface of the lens farthest from the center deviation measuring instrument as the lowermost surface; Measuring the spatial position relationship between the optical axis of the lens and the main axis includes measuring the spherical center coordinates of the uppermost surface and the lowermost surface of the lens and obtaining the eccentricity and tilt amount of the optical axis of the lens relative to the main axis; When the measured surface of the lens is the k-th optical surface of the lens, the surface eccentricity line amount of the measured surface relative to the main axis is expressed as: ； a is the surface eccentricity line quantity of the measured surface, d is the radius of the imaging circle of the autocollimation image of the center of the sphere of the measured surface on the camera, f obj is the focal length of the focusing objective lens, f autocollimator is the focal length of the autocollimator, β(k) is the vertical magnification of the k-th optical surface relative to the uppermost surface, and when the measured surface is the uppermost surface, β(k) is 1.

3. The turning device according to claim 2, characterized in that, β(k) is expressed as: ； l(k) is the distance from the spherical center of the k-th optical surface to the vertex of the (k - 1)-th optical surface, and l(k)' is the distance from the image point of the spherical center of the k-th optical surface relative to the (k - 1)-th optical surface imaged on the camera to the vertex of the (k - 1)-th optical surface.

4. The turning device according to claim 1, characterized in that, The tool includes a front tool and a rear tool. The front tool turns the front end face of the lens frame and the outer cylindrical surface of the lens frame. The rear tool is located on the side of the front tool away from the first support and is used to turn the rear end face of the lens frame.

5. The turning device according to claim 4, characterized in that, The distance between the front tool and the lens frame is less than the distance between the rear tool and the lens frame.

6. The turning device according to claim 1, characterized in that, The turning device includes a motor connected to the main shaft to drive the main shaft to rotate, and the motor is connected to the angle encoder. The motor and the angle encoder cooperate to form a closed-loop control.

7. A turning method for processing a lens assembly, the lens assembly including a lens frame and a lens mounted on the lens frame, which includes: Providing the turning device according to any one of claims 1 to 6, and mounting the lens assembly on the main shaft; Measuring the spatial position relationship between the optical axis of the lens and the main axis, and establishing a three-dimensional turning trajectory of the lens assembly; According to the three-dimensional turning trajectory, turning the lens frame under the three-axis servo linkage of the main shaft, the first support, and the third support.

8. The turning method according to claim 7, characterized in that Including: Moving the first support to make the main shaft opposite to the center deviation measuring instrument, so that the lens assembly is located at the measuring station. The center deviation measuring instrument measures the spatial position relationship between the optical axis of the lens and the main axis, and establishes the three-dimensional turning trajectory of the lens assembly; And Moving the first support to make the main shaft opposite to the tool, so that the lens assembly is located at the processing station. The tool turns the lens frame under the three-axis servo linkage of the main shaft, the first support, and the third support according to the three-dimensional turning trajectory.

Images