Lens installation precision measuring system and lens installation precision measuring method

Abstract

The invention relates to a lens installation precision measurement system and a lens installation precision measurement method, and the system comprises a lens barrel which is internally provided with a to-be-measured lens in an inclined manner, one side of the lens barrel is provided with a first interface, and the other adjacent side is provided with a second interface; the first light guide cylinder is physically connected with the first interface, a first light transmission assembly and a second light transmission assembly which are the same are arranged in the first light guide cylinder at intervals, and the centers of the first light transmission assembly and the second light transmission assembly have the same feature structure; the objective lens is physically connected with the second interface; the camera and the objective lens are positioned on two opposite sides of the lens barrel; the lens barrel, the first light guide barrel and the objective lens are all located on a light path of the light source, light emitted by the light source is made to enter a to-be-detected lens in the lens barrel in parallel through the first light guide barrel, the light is reflected by the to-be-detected lens and then is emitted to the observation plate through the objective lens, and imaging is conducted on the observation plate through the camera. By adopting the mode, the technical problems of low measurement efficiency and measurement precision of the lens installation precision are ingeniously solved.

Description

Technical Field

[0001] The present application relates to the field of visual inspection technology, and in particular to a lens installation accuracy measurement system and a lens installation accuracy measurement method. Background Art

[0002] At present, in industrial visual inspection, 45° reflectors or 45° beamsplitters are used in many places. For example, a 45° beamsplitter is used inside a telecentric lens to achieve coaxial light illumination, and a 45° beamsplitter is often used inside a microscope tube to achieve coaxial illumination. Laser autofocus that requires a coaxial light path also uses a 45° laser beamsplitter. In some high-precision imaging optical paths, when it comes to optical path turns, a 45° reflector is also used instead of a right-angle prism, because a right-angle prism will change the optical path, which will affect the image quality.

[0003] In the above scenarios, especially in the field of high-precision coaxial autofocus and high-precision optical path turning imaging, how to ensure the accurate measurement and installation of 45-degree lenses is a very important issue.

[0004] In the related art, it is usually adopted to directly connect the light source to the incident port of the tube lens housing, and then observe the uniformity of the image brightness at the imaging end to determine whether the position and angle of the installed lens are correct. However, this measurement method has low measurement efficiency and measurement accuracy.

[0005] Therefore, it is necessary to design a new lens installation accuracy measurement system and lens installation accuracy measurement method to overcome the above problems. Summary of the invention

[0006] The present application provides a lens installation accuracy measurement system and a lens installation accuracy measurement method, which can solve the technical problem of low measurement efficiency and measurement accuracy in the related art of judging the position and angle of the lens by observing the uniformity of image brightness.

[0007] In a first aspect, an embodiment of the present application provides a lens installation accuracy measurement system, which includes: a lens barrel, in which a lens to be measured is obliquely installed, one side of the lens barrel has a first interface, and the other adjacent side has a second interface; a first light guide tube, which is physically connected to the first interface, and the first light guide tube is provided with identical first and second light-transmitting components at intervals, and the centers of the first and second light-transmitting components have the same characteristic structure; an objective lens and a camera, the objective lens is physically connected to the second interface, and the camera and the objective lens are located on opposite sides of the lens barrel; a light source, the lens barrel, the first light guide tube, and the objective lens are all located on the optical path of the light source, and the light emitted by the light source is incident on the lens to be measured in the lens barrel in parallel through the first light guide tube, and is emitted to an observation plate through the objective lens after reflection by the lens to be measured, and the observation plate is imaged by the camera.

[0008] In combination with the first aspect, in one embodiment, the first light transmitting component and the second light transmitting component are both crosshairs, the intersection of the two crosshairs is located on the axis of the first light guide tube, and the characteristic structure is the intersection of the centers of the crosshairs.

[0009] In combination with the first aspect, in one embodiment, a central through hole is provided at the intersection of the cross wires.

[0010] In combination with the first aspect, in one embodiment, the first light-transmitting component and the second light-transmitting component are both components having a central through hole, the central through holes of the first light-transmitting component and the second light-transmitting component are located on the axis of the first light guide tube, and the characteristic structure is the central through hole.

[0011] In combination with the first aspect, in one implementation, the observation plate is a wafer or a flat glass.

[0012] In a second aspect, an embodiment of the present application provides a method for measuring lens installation accuracy, which comprises the following steps:

[0013] Turn on the light source so that the light emitted by the light source passes through the first light guide tube and is incident on the lens to be tested in parallel in the lens tube, and then is reflected by the lens to be tested and irradiated on the object to be tested through the objective lens;

[0014] The lens to be tested is obliquely installed in the lens barrel, one side of the lens barrel has a first interface, and the other side adjacent to the lens barrel has a second interface, the first light guide tube is physically connected to the first interface, the first light guide tube is provided with identical first light-transmitting components and second light-transmitting components at intervals, the centers of the first and second light-transmitting components have the same characteristic structure, and the objective lens is physically connected to the second interface;

[0015] The camera images the object to be tested to obtain an imaging picture, and determines the installation accuracy of the lens to be tested based on the deviation between the characteristic points formed on the imaging picture by the characteristic structures of the first light-transmitting component and the second light-transmitting component and the center point of the imaging picture.

[0016] In combination with the second aspect, in one embodiment, the first light-transmitting component and the second light-transmitting component are both components with central through holes, the central through holes of the first light-transmitting component and the second light-transmitting component are located on the axis of the first light guide tube, and the characteristic structure is a circular central through hole.

[0017] In combination with the second aspect, in one implementation, if the feature point in the imaging picture deviates to one side of the center point of the imaging picture and the feature point is circular, the inclination angle of the lens to be tested is 45°, but the installation position of the lens to be tested is deviated, and the lens to be tested is translated so that the feature point coincides with the center point of the imaging picture; if the feature point deviates to one side of the center point of the imaging picture and the feature point is elliptical, the inclination angle of the lens to be tested is not 45° and the installation position of the lens to be tested is deviated, and the inclination angle of the lens to be tested is adjusted so that the feature point coincides with the center point of the imaging picture.

[0018] In conjunction with the second aspect, in one implementation, before installing the objective lens, the method further includes:

[0019] Turn on the light source so that the light emitted by the light source passes through the first light guide tube and is incident on the lens to be tested in the lens tube, and the light reflected by the lens to be tested is projected onto the object to be tested;

[0020] Based on the positions of characteristic points formed on the projection pattern by the characteristic structures of the first light-transmitting component and the second light-transmitting component on the object to be measured, determining whether the optical axis of the light source is parallel to the axis of the first light guide cylinder;

[0021] If they are not parallel, the position or inclination of the light source is adjusted until the optical axis of the light source is parallel to the axis of the first light guide tube.

[0022] In combination with the second aspect, in one embodiment, if the characteristic point formed by the characteristic structure of the first light-transmitting component and the second light-transmitting component on the imaging picture deviates from the center point of the imaging picture, the position of the lens to be tested is adjusted until the characteristic point coincides with the center point of the imaging picture, and the position includes the installation position and the tilt angle of the lens to be tested.

[0023] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0024] By arranging a lens barrel with a lens to be tested installed, a first light guide tube with a first light-passing component and a second light-passing component installed, and an objective lens on the optical path of the light source, the light emitted by the light source can be incident on the lens to be tested in parallel through the first light guide tube, and then emitted to the observation plate through the objective lens after being reflected by the lens to be tested. After the observation plate is imaged by a camera, the installation accuracy of the lens to be tested can be determined based on the deviation between the characteristic points formed on the imaging picture based on the characteristic structures of the first light-passing component and the second light-passing component and the center point of the imaging picture. This method cleverly solves the technical problems of low measurement efficiency and low measurement accuracy of lens installation accuracy in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the structure of a lens installation accuracy measurement system provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure for measuring whether a light beam of a light source is incident in parallel provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of the structure of a first light-transmitting component provided in an embodiment of the present application;

[0029] Figure 4 A schematic structural diagram of another first light transmission component provided in an embodiment of the present application;

[0030] Figure 5 A schematic structural diagram of another first light transmission component provided in an embodiment of the present application;

[0031] Figure 6 A schematic diagram of the optical path when the tilt angle and installation position of the lens to be tested provided in the embodiment of the present application meet the requirements;

[0032] Figure 7 for Figure 6 A schematic diagram of an imaging screen formed by taking pictures with a camera;

[0033] Figure 8 A schematic diagram of the optical path when the tilt angle and installation position of the lens to be tested provided in the embodiment of the present application do not meet the requirements;

[0034] Fig. 9 for Figure 8 A schematic diagram of an imaging screen formed by taking pictures with a camera;

[0035] Fig.10 A schematic diagram of the optical path when the tilt angle of the lens to be tested provided in the embodiment of the present application meets the requirements but the installation position does not meet the requirements;

[0036] Fig.11 for Fig.10 Schematic diagram of the imaging image formed by the camera in FIG.

[0037] In the figure:

[0038] 1. Lens barrel; 11. First interface; 12. Second interface; 2. Lens to be tested;

[0039] 3. Light source; 4. First light guide tube; 5. First light transmission component; 6. Second light transmission component; 7. Characteristic structure;

[0040] 82. Observation board; 84. Objective lens; 85. Camera;

[0041] 9. Multi-axis adjustment frame; 10. Base. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] The embodiments of the present application provide a lens installation accuracy measurement system and a lens installation accuracy measurement method, which can solve the technical problem of low measurement efficiency and low measurement accuracy in the related art of judging the position and angle of the lens by observing the uniformity of image brightness.

[0044] See also Figure 1 As shown, a lens installation accuracy measurement system provided by an embodiment of the present application may include: a lens barrel 1, in which a lens to be measured 2 is obliquely installed, one side of the lens barrel 1 has a first interface 11, and the other adjacent side has a second interface 12; a first light guide tube 4, which is physically connected to the first interface 11, and the first light guide tube 4 is provided with identical first light-transmitting components 5 and second light-transmitting components 6 at intervals, and the centers of the first and second light-transmitting components 6 have the same characteristic structure 7; an objective lens 84 and a camera 85, wherein the objective lens 84 is physically connected to the second interface 12, and the camera 85 and the objective lens 84 are located on opposite sides of the lens barrel 1; a light source 3, wherein the lens barrel 1, the first light guide tube 4, and the objective lens 84 are all located on the optical path of the light source 3, and the light emitted by the light source 3 is parallelly incident on the lens to be measured 2 in the lens barrel 1 through the first light guide tube 4, and is emitted to the observation plate 82 through the objective lens 84 after being reflected by the lens to be measured 2, and the observation plate 82 is imaged by the camera 85.

[0045] See also Figure 1As shown, in this embodiment, the light source 3 is preferably a beam expanding laser, which can emit an expanded laser beam. Of course, a conventional laser or other device that can emit a light beam can also be selected, and there is no limitation here; the lens barrel 1 can be arranged in front of the light source 3, and the lens barrel 1 is preferably arranged as a tube lens housing, the above-mentioned first interface 11 is the light inlet of the lens barrel 1, and the second interface 12 is the light outlet of the lens barrel 1, and the axis of the light inlet is perpendicular to the axis of the light outlet; the lens 2 to be tested in this embodiment can be a lens such as a reflector or a spectroscope, and the general inclination angle of these lenses needs to be maintained at 45°. The lens installation accuracy measurement system is used to detect whether the inclination angle of the lens 2 to be tested in the lens barrel 1 is 45°, and can detect whether the installation position of the lens 2 to be tested is a standard position (the standard position here is selected as the intersection position of the axes of the first light guide tube 4 and the objective lens 84). In this embodiment, when the lens installation accuracy measurement system is used to detect the installation accuracy of the lens 2 to be tested, the axis of the light source 3 is colinear with the axis of the first light guide tube 4, the first light guide tube 4 is preferably connected to the first interface 11 of the lens barrel 1 by threads, and the first light passing component 5 and the second light passing component 6 in the first light guide tube 4 are arranged at intervals along the axis direction of the first light guide tube 4, the first light passing component 5 and the second light passing component 6 have the same structure, and the objective lens 84 is preferably installed to the second interface 12 of the lens barrel 1 by threads, so that the light emitted by the light source 3 can be irradiated to the lens 2 to be tested through the first light passing component 5 and the second light passing component 6, and then irradiated to the objective lens 84 through the second interface 12 after being reflected by the lens 2 to be tested. The arrows in the figure indicate the direction of the light beam.

[0046] In this embodiment, the lens installation accuracy measurement system adopts the method of combining an objective lens 84 with a camera 85, and two second interfaces 12 can be set on the lens barrel 1. The two second interfaces 12 are located on opposite sides of the lens barrel 1 (i.e., one above and one below), and the axes of the two second interfaces 12 are collinear and perpendicular to the axis of the first interface 11; the objective lens 84 is installed on one of the second interfaces 12, and the camera 85 is installed on the other second interface 12, and an observation plate 82 is set on the side of the objective lens 84 away from the camera 85, and the observation plate 82 has a flat imaging focus surface (i.e., the surface of the observation plate 82), and the imaging focus surface can be, for example, a metal surface, a glass surface or a wafer surface.

[0047] It should be understood that the above-mentioned characteristic structure 7 is a structure in the first light-transmitting component 5 and the second light-transmitting component 6 that is different from the structures at other positions other than the center position. For example, it can be a cross structure located at the center of the crosshairs, or a penetrating circular hole structure, or a through hole structure of other shapes, or a solid structure, etc., and there is no limitation here.

[0048] In this embodiment, a lens barrel 1 with a lens 2 to be tested installed, a first light guide tube 4 with a first light passing component 5 and a second light passing component 6 installed, and an objective lens 84 are arranged on the optical path of the light source 3. The light emitted by the light source 3 can be incident on the lens 2 to be tested in parallel through the first light guide tube 4, and then be emitted to the observation plate 82 through the objective lens 84 after being reflected by the lens 2 to be tested. The observation plate 82 can be imaged by the camera 85 to obtain an imaging picture, and the installation accuracy of the lens 2 to be tested can be determined based on the deviation between the characteristic points formed on the imaging picture by the characteristic structures 7 of the first light passing component 5 and the second light passing component 6 and the center point of the imaging picture. The installation position and tilt angle of the lens 2 to be tested can be adjusted based on the measured installation accuracy of the lens 2 to be tested, thereby improving the installation efficiency and installation accuracy of the lens. This method cleverly solves the technical problem of low measurement efficiency and low measurement accuracy of lens installation accuracy in the related art. The lens installation accuracy measurement system provided in this embodiment is mainly suitable for measuring the installation accuracy of the lens 2 to be tested in the imaging optical path. At the same time, the measurement accuracy of the lens installation accuracy measurement system in this embodiment can be determined by the distance h between the center of the light beam emitted by the light source 3 and the observation plate 82 along the axial direction of the objective lens 84 (tangent theorem of trigonometric functions).

[0049] Furthermore, in one embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 are both crosshairs, the intersection of the two crosshairs is located on the axis of the first light-guiding tube 4, and the characteristic structure 7 is the intersection of the centers of the crosshairs. In this embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 have the same structure and preferably use crosshairs, see Figures 3 to 5 As shown, there are three preferred crosshair structures. The first crosshair has no small hole in the center; the second crosshair has a small hole in the center to facilitate light alignment; the third crosshair is also an aperture, which has only a small hole in the center. Of course, in other embodiments, apertures of other structural shapes can also be used to replace the first light-transmitting component 5 and the second light-transmitting component 6, and the solution of the present application can be implemented. For the first crosshair, the characteristic structure 7 is the solid cross intersection in the center of the crosshair; for the second crosshair, the characteristic structure 7 is the cross structure in the center of the crosshair plus the small hole in the center; for the third crosshair, the characteristic structure 7 is the small hole in the center.

[0050] In this embodiment, a crosshair with a cross structure is preferably used in the first light guide tube 4, so that after the light beam is reflected by the lens 2 to be tested, a projection pattern with a "cross"-shaped feature point in the center will be formed on the observation plate 82, which is convenient for finding the position of the feature point, and for comparing the position of the "cross"-shaped feature point with the center point of the imaging screen in the subsequent process to find the position deviation. At the same time, the crosshairs in this embodiment can be ensured to be located at the center of the first light guide tube 4 through machining accuracy, and the first light guide tube 4 can be provided to ensure that the axes of the two crosshairs are located on the same straight line.

[0051] Based on the above technical solution, preferably, see Figure 4 As shown, the intersection of the cross wires is provided with a central through hole. Figure 4 The crosshairs shown are the preferred solution of the present application. The centers of the first light-transmitting component 5 and the second light-transmitting component 6 not only have a crosshair structure, but also have a center through hole in the center of the crosshairs. The center through hole is provided to facilitate light transmission at the center position, and a "cross"-shaped feature point with a center point can be formed, which is helpful for judging whether the center of the feature point is aligned, finding deviations, and making judgments more accurate and faster.

[0052] Further, in one embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 are components with a central through hole, the central through holes of the first light-transmitting component 5 and the second light-transmitting component 6 are located on the axis of the first light-guiding cylinder 4, and the characteristic structure 7 is a central through hole. Figure 4 and Figure 5 As shown, in this embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 can be circular plates or square plates or other structures, and the through holes located at the center of the first light-transmitting component 5 and the second light-transmitting component 6 can be circular holes or holes of various other shapes. Here, the central through holes of the first light-transmitting component 5 and the second light-transmitting component 6 are the characteristic structures 7 located at the center. The light emitted by the light source 3 can pass through the central through holes of the first light-transmitting component 5 and the second light-transmitting component 6 to illuminate the lens 2 to be tested, and after being reflected by the lens 2 to be tested, it is emitted to the observation plate 82 through the objective lens 84.

[0053] See also Figure 2As shown, in the above embodiment, before the installation accuracy of the lens 2 to be tested is tested, the objective lens 84 and the camera 85 may not be installed first, and the first light passing component 5 and the second light passing component 6 may be used to detect whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4, that is, two points form a line to determine whether the light beam emitted by the light source 3 is vertically incident on the first interface 11. Specifically, when the light source 3 is turned on, the light beam emitted by the light source 3 may pass through the first light passing component 5 and the second light passing component 6 and then irradiate the lens 2 to be tested. After being reflected by the lens 2 to be tested, the reflected light is projected on the observation plate 82 to form a projection pattern. If two non-concentric feature points are observed in the projection pattern on the observation plate 82, it means that the light beam emitted by the light source 3 is not parallel to the axis of the first light guide tube 4; if only one feature point is observed (the two feature points coincide at this time), it can be considered that the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4. If the first light-transmitting component 5 and the second light-transmitting component 6 use crosshairs, a cross shadow will be observed on the observation board 82. When only one cross shadow can be observed on the observation board 82, it can be considered that the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4. If it is found through the above observation that the light beam emitted by the light source 3 is not parallel to the axis of the first light guide tube 4, the position or inclination of the light source 3 can be adjusted to make the light beam emitted by the light source 3 parallel to the axis of the first light guide tube 4.

[0054] It should be understood that when detecting whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4, the first light guide tube 4 can also be installed at the second interface 12 position of the lens barrel 1, so that the incident light is reflected by the lens 2 to be tested and irradiated to the first light-transmitting component 5 and the second light-transmitting component 6 in the first light guide tube 4, and then irradiated to the observation plate 82 through the first light-transmitting component 5 and the second light-transmitting component 6. This method can also determine whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4 based on whether the two characteristic points coincide, which will not be repeated here.

[0055] Furthermore, when detecting whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4, the objective lens 84 can also be installed to the second interface 12, and the camera 85 (ie Figure 1 The structure shown in the figure is used to shoot the observation plate 82 with the camera 85 to obtain an imaging picture, and observe whether the two characteristic points in the imaging picture coincide with each other to judge whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4. When only one characteristic point is observed from the imaging picture, it can be considered that the light beam of the light source 3 is parallel to the axis of the first light guide tube 4.

[0056] Preferably, the above-mentioned lens installation accuracy measurement system may also include a multi-axis adjustment frame 9, a base 10 is fixed at the bottom of the multi-axis adjustment frame 9, and the light source 3 is installed on the multi-axis adjustment frame 9. The multi-axis adjustment frame 9 can be used to move the light source 3 up and down or left and right, or adjust the front and rear inclination angle or left and right inclination angle of the light source 3 until only one characteristic point is seen on the observation plate 82. At this time, the optical axis of the light source 3 is adjusted to be parallel to the axis of the first light guide tube 4.

[0057] See also Figure 1 As shown, in this embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 in the first light-guiding tube 4 both use crosshairs. When the light source 3 emits a light beam, if the cross intersection is observed to coincide with the center point of the imaging picture in the imaging picture (wherein the cross intersection is a characteristic point formed by the projection of the characteristic structure 7 at the center of the first light-transmitting component 5 and the second light-transmitting component 6), it is proved that the inclination angle and installation position of the lens 2 to be tested meet the requirements (that is, the inclination angle is 45°, and the installation position is also in the standard position); if the cross intersection is observed to not coincide with the center point of the imaging picture in the imaging picture, it is proved that the inclination angle and / or installation position of the lens 2 to be tested do not meet the requirements. When the cross intersection is observed to not coincide with the center point of the imaging picture in the imaging picture, the installation accuracy of the lens 2 to be tested can be determined according to the degree of deviation of the cross intersection relative to the center point of the imaging picture.

[0058] Preferably, the observation plate 82 is a wafer or a flat glass. Of course, the observation plate 82 can also be made of other materials, which is not limited here.

[0059] Preferably, in the above embodiment, the lens installation accuracy measurement system may further include a PC and a display, the PC is connected to the camera 85, the display may display the imaging picture, and the PC may record and save the installation accuracy of the lens 2 to be measured.

[0060] The embodiment of the present application also provides a method for measuring lens installation accuracy, which may include the following steps:

[0061] S1: Turn on the light source 3, so that the light emitted by the light source 3 passes through the first light guide tube 4 and is incident on the lens 2 to be tested in parallel in the lens barrel 1, and is reflected by the lens 2 to be tested and then irradiated on the object to be tested through the objective lens 84; wherein the lens 2 to be tested is obliquely installed in the lens barrel 1, one side of the lens barrel 1 has a first interface 11, and the other adjacent side has a second interface 12, the first light guide tube 4 is physically connected to the first interface 11, the first light guide tube 4 is provided with the same first light-transmitting component 5 and the second light-transmitting component 6 at intervals, the centers of the first and second light-transmitting components 6 have the same characteristic structure 7, and the objective lens 84 is physically connected to the second interface 12.

[0062] S2: The camera 85 images the object to be tested and obtains an imaging picture, and determines the installation accuracy of the lens 2 to be tested according to the deviation between the characteristic points formed on the imaging picture by the characteristic structures 7 of the first light transmitting component 5 and the second light transmitting component 6 and the center point of the imaging picture.

[0063] The lens installation accuracy measurement method of this embodiment can be measured by using the lens installation accuracy measurement system provided in any of the above embodiments to achieve the corresponding functions, which will not be described in detail here. The above-mentioned object to be measured can be, for example, the observation plate 82 or other objects to be measured that can project light.

[0064] In this embodiment, the light emitted by the light source 3 can be incident on the lens to be tested 2 in parallel through the first light guide tube 4, and then emitted to the object to be tested through the objective lens 84 after being reflected by the lens to be tested. The object to be tested can be imaged by the camera 85 to obtain an imaging picture, and the installation accuracy of the lens to be tested 2 can be determined based on the deviation between the characteristic points formed on the imaging picture by the characteristic structures 7 of the first light-passing component 5 and the second light-passing component 6 and the center point of the imaging picture. The installation position and tilt angle of the lens to be tested 2 can be adjusted based on the measured installation accuracy of the lens to be tested 2, thereby improving the installation efficiency and installation accuracy of the lens. This method cleverly solves the technical problem of low measurement efficiency and low measurement accuracy of lens installation accuracy in the related art.

[0065] Furthermore, in one embodiment, both the first light-transmitting component 5 and the second light-transmitting component 6 are components with a central through hole, and the central through holes of the first light-transmitting component 5 and the second light-transmitting component 6 are located on the axis of the first light-guiding tube 4, and the characteristic structure 7 is a circular central through hole. In this embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 can be circular plates or square plates or other structures, and the through holes located at the centers of the first light-transmitting component 5 and the second light-transmitting component 6 can be circular holes or holes of various other shapes. Here, the central through holes of the first light-transmitting component 5 and the second light-transmitting component 6 are the characteristic structures 7 located at the center. The light emitted by the light source 3 can pass through the central through holes of the first light-transmitting component 5 and the second light-transmitting component 6 to illuminate the lens 2 to be tested, and after being reflected by the lens 2 to be tested, it is emitted to the object to be tested through the objective lens 84.

[0066] Furthermore, in one embodiment, the lens installation accuracy measurement method includes: if the feature point in the imaging picture deviates to one side of the center point of the imaging picture, and the feature point is circular, the inclination angle of the lens 2 to be tested is 45°, but the installation position of the lens 2 to be tested is deviated, and the lens 2 to be tested is translated so that the feature point coincides with the center point of the imaging picture; if the feature point deviates to one side of the center point of the imaging picture, and the feature point is elliptical, the inclination angle of the lens 2 to be tested is not 45° and the installation position of the lens 2 to be tested is deviated, and the inclination angle of the lens 2 to be tested is adjusted so that the feature point coincides with the center point of the imaging picture.

[0067] In this embodiment, the characteristic structure 7 is taken as an example of a circular central through hole. Figure 6 As shown in FIG. 1 , when the tilt angle and installation position of the lens 2 to be tested meet the requirements (that is, the tilt angle is the standard 45° and the installation position is the standard position), the characteristic point is observed to be circular in the imaging picture, and the center of the characteristic point coincides with the center point of the imaging picture ( Figure 7 See Figure 8 As shown in FIG. 1 , when the tilt angle and installation position of the lens 2 to be tested do not meet the requirements (that is, the tilt angle is not the standard 45°, and the installation position is not the standard position), the characteristic point is observed to be an ellipse in the imaging picture, and the characteristic point deviates to one side of the center point of the imaging picture ( Fig. 9 See Fig.10 As shown in FIG. 1 , when the tilt angle of the lens 2 to be tested meets the requirement, but the installation position does not meet the requirement (that is, the tilt angle is the standard 45°, but the installation position is not the standard position), the characteristic point is observed to be circular in the imaging picture, and the characteristic point deviates to one side of the center point of the imaging picture ( Fig.11 Therefore, by comparing the degree of deviation between the feature point in the imaging picture and the center point of the imaging picture and the shape of the feature point, it is possible to accurately know whether the tilt angle and installation position of the lens 2 to be tested meet the requirements.

[0068] Furthermore, in one embodiment, before installing the objective lens 84, the following steps may be included:

[0069] Step a: Turn on the light source 3 so that the light emitted by the light source 3 is incident on the lens 2 to be tested in the lens barrel 1 through the first light guide tube 4, and the light reflected by the lens 2 to be tested is projected onto the object to be tested.

[0070] Step b: judging whether the optical axis of the light source 3 is parallel to the axis of the first light guide tube 4 based on the positions of the characteristic points formed on the projection pattern by the characteristic structures 7 of the first light transmitting component 5 and the second light transmitting component 6 on the object to be tested.

[0071] Step c: If they are not parallel, adjust the position or inclination of the light source 3 until the optical axis of the light source 3 is parallel to the axis of the first light guide tube 4 .

[0072] That is, before detecting the installation accuracy of the lens 2 to be tested, the first light-transmitting component 5 and the second light-transmitting component 6 can be used to detect whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4. The light beam emitted by the light source 3 is adjusted to be parallel to the axis of the first light guide tube 4, which helps to ensure that the installation accuracy of the lens 2 to be tested can be accurately measured later.

[0073] See also Figure 2 As shown, the specific detection steps are as follows: when the light source 3 is turned on, the light beam emitted by the light source 3 can pass through the first light-transmitting component 5 and the second light-transmitting component 6 and then irradiate the lens 2 to be tested. After being reflected by the lens 2 to be tested, the reflected light is projected on the object to be tested to form a projection pattern. If two non-concentric feature points are observed in the projection pattern on the object to be tested, it means that the light beam emitted by the light source 3 is not parallel to the axis of the first light guide tube 4; if only one feature point is observed (the two feature points coincide at this time), it can be considered that the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4. If the first light-transmitting component 5 and the second light-transmitting component 6 use cross hairs, a cross shadow will be observed on the object to be tested. When only one cross shadow can be observed from the object to be tested, it can be considered that the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4. If, after the above observation, it is found that the light beam emitted by the light source 3 is not parallel to the axis of the first light guide tube 4, the position or inclination of the light source 3 can be adjusted to make the light beam emitted by the light source 3 parallel to the axis of the first light guide tube 4.

[0074] Furthermore, in one embodiment, if the characteristic points formed by the characteristic structures 7 of the first light-transmitting component 5 and the second light-transmitting component 6 on the imaging picture deviate from the center point of the imaging picture, the position of the lens 2 to be tested is adjusted until the characteristic points coincide with the center point of the imaging picture, and the position includes the installation position and the tilt angle of the lens 2 to be tested.

[0075] The lens installation accuracy measurement method provided in the embodiment of the present application can accurately detect the installation position and tilt angle of a 45° reflector or a beam splitter, and can monitor in real time whether the adjustment status reaches the target value while adjusting the installation position and tilt angle of the reflector or the beam splitter. The measurement method is simple, convenient and efficient.

[0076] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0077] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0078] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A lens installation accuracy measurement system, characterized in that: It includes: A lens barrel (1), wherein a lens to be tested (2) is obliquely mounted inside the lens barrel (1), and one side of the lens barrel (1) has a first interface (11), and the other adjacent side has a second interface (12); A first light guide tube (4) which is physically connected to the first interface (11), wherein the first light guide tube (4) is provided with identical first light-transmitting components (5) and second light-transmitting components (6) at intervals, and the centers of the first and second light-transmitting components have identical characteristic structures (7); an objective lens (84) and a camera (85), wherein the objective lens (84) is physically connected to the second interface (12), and the camera (85) and the objective lens (84) are located on opposite sides of the lens barrel (1); A light source (3), the lens barrel (1), the first light guide tube (4), and the objective lens (84) are all located on the optical path of the light source (3), so that the light emitted by the light source passes through the first light guide tube (4) and is incident in parallel on the lens to be tested (2) in the lens barrel (1), is reflected by the lens to be tested (2), and is emitted through the objective lens (84) to an observation plate (82), and the observation plate (82) is imaged by the camera (85).

2. The lens installation accuracy measurement system according to claim 1, characterized in that: The first light-transmitting component (5) and the second light-transmitting component (6) are both crosshairs, the intersection of the two crosshairs is located on the axis of the first light-guiding tube (4), and the characteristic structure (7) is the intersection of the centers of the crosshairs.

3. The lens installation accuracy measurement system according to claim 2, characterized in that: A central through hole is provided at the intersection of the cross wires.

4. The lens installation accuracy measurement system according to claim 1, characterized in that: The first light-transmitting component (5) and the second light-transmitting component (6) are both components having a central through hole, the central through holes of the first light-transmitting component (5) and the second light-transmitting component (6) are located on the axis of the first light-guiding cylinder (4), and the characteristic structure (7) is a central through hole.

5. The lens installation accuracy measurement system according to claim 1, characterized in that: The observation plate (82) is a wafer or a flat glass.

6. A method for measuring lens installation accuracy, characterized in that: It includes the following steps: Turning on the light source (3) so that the light emitted by the light source (3) passes through the first light guide tube (4) and is incident in parallel on the lens to be tested (2) in the lens tube (1), and after being reflected by the lens to be tested (2), is irradiated on the object to be tested through the objective lens (84); The lens (2) to be tested is obliquely installed in the lens barrel (1), one side of the lens barrel (1) has a first interface (11), and the other adjacent side has a second interface (12), the first light guide tube (4) is physically connected to the first interface (11), the first light guide tube (4) has identical first light-transmitting components (5) and second light-transmitting components (6) arranged in intervals in the first light guide tube (4), the centers of the first and second light-transmitting components have identical characteristic structures (7), and the objective lens (84) is physically connected to the second interface (12); The camera (85) images the object to be tested to obtain an imaging picture, and the installation accuracy of the lens (2) to be tested is determined based on the deviation between the characteristic points formed on the imaging picture by the characteristic structures (7) of the first light-transmitting component (5) and the second light-transmitting component (6) and the center point of the imaging picture.

7. The lens installation accuracy measurement method according to claim 6, characterized in that: The first light-transmitting component (5) and the second light-transmitting component (6) are both components having a central through hole, the central through holes of the first light-transmitting component (5) and the second light-transmitting component (6) are located on the axis of the first light-guiding cylinder (4), and the characteristic structure (7) is a circular central through hole.

8. The lens installation accuracy measurement method according to claim 7, characterized in that: If the feature point in the imaging picture deviates to one side of the center point of the imaging picture, and the feature point is circular, the tilt angle of the lens to be tested (2) is 45°, but the installation position of the lens to be tested (2) is deviated, and the lens to be tested (2) is translated so that the feature point coincides with the center point of the imaging picture; If the feature point deviates to one side of the center point of the imaging picture and the feature point is elliptical, the tilt angle of the lens to be tested (2) is not 45° and the installation position of the lens to be tested (2) is deviated, and the tilt angle of the lens to be tested (2) is adjusted so that the feature point coincides with the center point of the imaging picture.

9. The lens installation accuracy measurement method according to claim 6, characterized in that: Before installing the objective lens (84), the method further comprises: Turning on the light source, so that the light emitted by the light source (3) passes through the first light guide tube (4) and is incident on the lens to be tested (2) in the lens tube (1), and the light reflected by the lens to be tested (2) is projected onto the object to be tested; Based on the positions of characteristic points respectively formed on the projection pattern by the characteristic structures (7) of the first light-transmitting component (5) and the second light-transmitting component (6) on the object to be measured, it is determined whether the optical axis of the light source (3) is parallel to the axis of the first light-guiding cylinder (4); If they are not parallel, the position or inclination of the light source (3) is adjusted until the optical axis of the light source (3) is parallel to the axis of the first light guide tube (4).

10. The lens installation accuracy measurement method according to claim 6, characterized in that: If the characteristic points formed on the imaging picture by the characteristic structures (7) of the first light-transmitting component (5) and the second light-transmitting component (6) deviate from the center point of the imaging picture, the position of the lens (2) to be tested is adjusted until the characteristic points coincide with the center point of the imaging picture, wherein the position includes the installation position and the tilt angle of the lens (2) to be tested.

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