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, and 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; the second light guide cylinder is physically connected with the second interface, a third light transmission assembly is arranged in the second light guide cylinder, and the centers of the three light transmission assemblies have the same feature structure; the lens barrel, the first light guide barrel and the second light guide barrel are all located on a light path of the light source; the observation plate is located at the exit port of the second light guide cylinder and used for receiving the projection pattern of the reflected light. By adopting the mode of the invention, the installation precision of the to-be-measured lens on the light path which does not participate in imaging can be measured, and the technical problem that the light path which does not participate in imaging cannot be measured in the prior art is 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 method can only be used to measure the imaging light path, and cannot measure the light path that does not participate in the imaging.

[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 in the related art that the optical path that does not participate in imaging cannot be measured.

[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 barrel, which is physically connected to the first interface, and the first light guide barrel has identical first and second light guide components arranged therein at intervals; a second light guide barrel, which is physically connected to the second interface, and the second light guide barrel has a third light guide component arranged therein, and the centers of the first, second and third light guide components all have the same characteristic structure; a light source, wherein the lens barrel, the first light guide barrel and the second light guide barrel are all located on the optical path of the light source, and light emitted by the light source passes through the first light guide barrel and is incident in parallel to the lens to be measured in the lens barrel, and is reflected by the lens to be measured and then emitted through the second light guide barrel; an observation plate, which is located at the exit of the second light guide barrel, and is used to receive a projection pattern of reflected light, and determine the installation accuracy of the lens to be measured based on a distance deviation between the position of a characteristic point formed on the projection pattern by the characteristic structures of the first and second light guide components and the position of a characteristic point formed on the projection pattern by the characteristic structure of the third light guide component.

[0008] In combination with the first aspect, in one embodiment, the first light-transmitting component, the second light-transmitting component and the third light-transmitting component are all cross hairs, the intersection of the cross hairs of the first light-transmitting component and the second light-transmitting component are located on the axis of the first light guide tube, the intersection of the cross hairs of the third light-transmitting component is located on the central axis of the lens tube, and the characteristic structure is the intersection of the centers of the cross hairs.

[0009] In combination with the first aspect, in one implementation, a central through hole is provided at the intersection of the cross wires of the first light-transmitting component, the second light-transmitting component and the third light-transmitting component.

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

[0011] In combination with the first aspect, in one embodiment, the observation plate is provided with concentric rings with scales.

[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 then emitted through the second light guide tube, and a projection pattern is projected onto an observation plate located at the emission port of the second light guide tube;

[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 second light guide tube is physically connected to the second interface, the second light guide tube is provided with a third light-transmitting component, and the centers of the first, second and third light-transmitting components all have the same characteristic structure;

[0015] A projection pattern of reflected light is obtained from the observation plate, and the installation accuracy of the lens to be tested is determined based on a distance deviation between positions of characteristic points formed on the projection pattern by characteristic structures of the first and second light-transmitting components and positions of characteristic points formed on the projection pattern by characteristic structures of the third light-transmitting component.

[0016] In combination with the second aspect, in one embodiment, the distance deviation between the positions of characteristic points formed by the characteristic structures of the first light-transmitting component and the second light-transmitting component on the projection pattern of the observation plate and the position of characteristic points formed by the characteristic structure of the third light-transmitting component on the projection pattern of the observation plate is compared; and the installation accuracy of the lens to be tested is determined based on the distance deviation.

[0017] In conjunction with the second aspect, in one implementation, before installing the second light guide tube, the method further includes:

[0018] 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 barrel, and the light reflected by the lens to be tested is projected onto the observation plate;

[0019] 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 observation plate, determining whether the optical axis of the light source is parallel to the axis of the first light guide cylinder;

[0020] 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.

[0021] In combination with the second aspect, in one embodiment, if the installation accuracy is less than a preset value, the inclination angle or the installation position of the lens to be tested is adjusted, and the positions of the characteristic points formed by the characteristic structures of the first light-transmitting component and the second light-transmitting component on the projection pattern are compared with the positions of the characteristic points formed by the characteristic structures of the third light-transmitting component on the projection pattern until the installation accuracy reaches the preset value.

[0022] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0023] By arranging a lens barrel on which a lens to be tested is installed, a first light guide barrel on which a first light-transmitting component and a second light-transmitting component are installed, and a second light guide barrel on which a third light-transmitting component is installed on the optical path of a light source, light emitted by the light source can be incident on the lens to be tested in parallel through the first light guide barrel, and can be emitted through the second light guide barrel after being reflected by the lens to be tested. A projection pattern of the reflected light can be received through an observation plate, and the installation accuracy of the lens to be tested can be determined based on a distance deviation between positions of feature points formed on the projection pattern by feature structures of the first light-transmitting component and the second light-transmitting component in the first light guide barrel and positions of feature points formed on the projection pattern by feature structures of the third light-transmitting component in the second light guide barrel. In this way, the installation accuracy of the lens to be tested on an optical path that does not participate in imaging can be measured, thereby solving the technical problem in the related art that the optical path that does not participate in imaging cannot be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 A schematic diagram of the structure of a lens installation accuracy measurement system provided in an embodiment of the present application;

[0026] 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;

[0027] Figure 3 A schematic diagram of the structure of a first light-transmitting component provided in an embodiment of the present application;

[0028] Figure 4 A schematic structural diagram of another first light transmission component provided in an embodiment of the present application;

[0029] Figure 5 A schematic structural diagram of another first light transmission component provided in an embodiment of the present application;

[0030] 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;

[0031] Figure 7 (a) is Figure 6 Schematic diagram of a characteristic point formed on the observation plate, (b) Figure 6 A schematic diagram of another characteristic point formed on the observation plate;

[0032] 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;

[0033] Fig. 9 (a) is Figure 8 Schematic diagram of a characteristic point formed on the observation plate, (b) Figure 8 A schematic diagram of another characteristic point formed on the observation plate;

[0034] 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;

[0035] Fig.11 (a) is Fig.10 Schematic diagram of a characteristic point formed on the observation plate, (b) Fig.10 Schematic diagram of another type of feature point formed on the observation plate.

[0036] In the figure:

[0037] 1. Lens barrel; 11. First interface; 12. Second interface; 2. Lens to be tested;

[0038] 3. Light source; 4. First light guide tube; 5. First light transmission component; 6. Second light transmission component; 7. Characteristic structure;

[0039] 81. second light guide tube; 82. observation plate; 83. third light transmission component;

[0040] 9. Multi-axis adjustment frame; 10. Base. DETAILED DESCRIPTION

[0041] 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.

[0042] 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 in the related art that the optical path that does not participate in imaging cannot be measured.

[0043] 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 side adjacent to the lens barrel 1 has a second interface 12; a first light guide barrel 4, which is physically connected to the first interface 11, and the first light guide barrel 4 is provided with the same first light-transmitting component 5 and second light-transmitting component 6 at intervals; a second light guide barrel 81, which is physically connected to the second interface 12, and the second light guide barrel 81 is provided with a third light-transmitting component 83, and the centers of the first, second and third light-transmitting components 83 all have the same characteristic structure 7; a light source 3, the lens barrel 1, the first light guide barrel 4 , and the second light guide tube 81 are both located on the optical path of the light source 3, and enable the light emitted by the light source 3 to be incident on the lens 2 to be tested in the lens barrel 1 through the first light guide tube 4 in parallel, and then be emitted through the second light guide tube 81 after being reflected by the lens 2 to be tested; an observation plate 82, the observation plate 82 is located at the exit of the second light guide tube 81, and is used to receive the projection pattern of the reflected light, and determine the installation accuracy of the lens 2 to be tested based on the distance deviation between the position of the characteristic point formed on the projection pattern by the characteristic structure 7 of the first light-transmitting component 5 and the second light-transmitting component 6 and the position of the characteristic point formed on the projection pattern by the characteristic structure 7 of the third light-transmitting component 83.

[0044] 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. 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, and the first light guide tube 4 is preferably connected to the first interface 11 of the lens barrel 1 by means of 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, and the first light passing component 5 and the second light passing component 6 have the same structure, and the second light guide tube 81 is preferably installed to the second interface 12 of the lens barrel 1 by means of 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 can be irradiated to the second light guide tube 81 through the second interface 12 after being reflected by the lens 2 to be tested.

[0045] In the above embodiment, the structure of the third light-transmitting component 83 may be completely identical to that of the first light-transmitting component 5 , or may not be completely identical. However, the centers of the first light-transmitting component 5 , the second light-transmitting component 6 and the third light-transmitting component 83 all have the same characteristic structure 7 .

[0046] It should be understood that the above-mentioned characteristic structure 7 is a structure that is different from the structures at other positions other than the center position in the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83, 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.

[0047] In this embodiment, a lens barrel 1 with a lens to be tested 2 installed, a first light guide barrel 4 with a first light passing component 5 and a second light passing component 6 installed, and a second light guide barrel 81 with a third light passing component 83 installed are arranged on the optical path of the light source 3, and the same characteristic structure 7 is arranged at the centers of the first light passing component 5, the second light passing component 6 and the third light passing component 83. 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 barrel 4, and can be emitted through the second light guide barrel 81 after being reflected by the lens to be tested 2. The projection pattern of the reflected light can be received through the observation plate 82. Based on the first light passing component 5 and the second light passing component 6 in the first light guide barrel 4, the projection pattern of the reflected light can be reflected through the observation plate 82. The distance deviation between the position of the characteristic point formed by the characteristic structure 7 of the second light-transmitting component 6 on the projection pattern and the position of the characteristic point formed by the characteristic structure 7 of the third light-transmitting component 83 in the second light-guiding tube 81 on the projection pattern can determine the installation accuracy of the lens 2 to be tested. The installation position and inclination 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. In this way, the installation accuracy of the lens 2 to be tested on the optical path that does not participate in imaging can be measured, which solves the technical problem in the related art that the optical path that does not participate in imaging cannot be measured.

[0048] See also Figure 1 As shown, the second light guide tube 81 is coaxially arranged with the second interface 12, and the third light passing component 83 in the second light guide tube 81 is coaxially arranged with the second light guide tube 81. In this embodiment, the structural shape of the third light passing component 83 is preferably set to be consistent with the structural shape of the first light passing component 5 and the second light passing component 6, so as to facilitate subsequent observation of whether the characteristic points of the two coincide. The arrow in the figure indicates the direction of the light beam. In the above embodiment, the third light passing component 83 can be integrally formed in the second light guide tube 81, or it can be separately formed, for example, an aperture or a crosshair structure is installed in the second light guide tube 81, and a characteristic structure 7 is set in the center of the aperture and the crosshair.

[0049] The above-mentioned lens installation accuracy measurement system is mainly suitable for measuring the installation accuracy of the lens 2 to be tested in the non-imaging optical path; since the lens will change the path of light propagation along a straight line, if the lens has not been installed in the imaging optical path, the lens installation accuracy measurement system can also be used to measure the installation accuracy of the lens 2 to be tested.

[0050] Further, in one embodiment, the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83 can all be crosshairs, the intersection of the crosshairs of the first light-transmitting component 5 and the second light-transmitting component 6 is located on the axis of the first light-guiding tube 4, the intersection of the crosshairs of the third light-transmitting component 83 is located on the central axis of the lens barrel 1, and the characteristic structure 7 is the intersection of the centers of the crosshairs. In this embodiment, the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83 have the same structure and preferably use crosshairs, see Figures 3 to 5As 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 only has 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, the second light-transmitting component 6 and the third light-transmitting component 83, 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.

[0051] 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 other position references 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.

[0052] Based on the above technical solution, preferably, see Figure 4 As shown, the intersection of the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83 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, the second light-transmitting component 6 and the third light-transmitting component 83 not only have a crosshair structure, but also have a central through hole in the center of the crosshairs. The central 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.

[0053] Further, in one embodiment, the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83 are all components with central through holes, 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, the central through hole of the third light-transmitting component 83 is located on the central axis of the lens barrel 1, and the characteristic structure 7 is a central through hole. Figure 4 and Figure 5As shown, in this embodiment, the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83 can all be circular plates or square plates or other structures, and the through holes located at the centers of the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83 can be circular holes or holes of various other shapes. Here, the central through holes of the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83 are the characteristic structures 7 located at the center mentioned above. 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 irradiate the lens to be tested 2, and after being reflected by the lens to be tested 2, it is emitted through the second light guide tube 81 to the observation plate 82 to form a projection pattern; at the same time, the reflected light will also pass through the center of the third light-transmitting component 83 in the second light guide tube 81 to irradiate the observation plate 82.

[0054] See also Figure 2 As shown, in the above embodiment, before the installation accuracy of the lens 2 to be tested is tested, the second light guide tube 81 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.

[0055] 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.

[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 adopt crosshairs, and the third light-transmitting component 83 in the second light-guiding tube 81 also adopts crosshairs. The third light-transmitting component 83 is completely consistent with the first light-transmitting component 5 and the second light-transmitting component 6 in structure and shape, and concentric rings with scales can be set on the observation plate 82. When the light source 3 emits a light beam, if only one cross intersection is still observed on the observation plate 82 (the three cross intersections completely overlap), it proves that the inclination angle and the installation position of the lens to be tested 2 meet the requirements (that is, the inclination angle is 45°, and the installation position is also in the standard position); that is, the three points are collinear to establish the 45° inclination angle and the installation position of the lens to be tested 2 accurately; if it is observed on the observation plate 82 that the centers of the two cross intersections do not overlap (wherein the two cross intersections in the first light-guiding tube 4 overlap), it means that the installation position or inclination angle of the lens to be tested 2 does not meet the requirements. When the centers of the two cross points observed on the observation plate 82 do not coincide, the distance between the centers of the two cross points can be observed on the observation plate 82 through the scale, and the installation position or the tilt angle value that needs to be adjusted for the lens 2 to be tested can be known through the distance (the correspondence between the distance and the angle value to be adjusted or the installation position can be calibrated using the laser after collimation and expansion), that is, the distance between a cross point formed by two points in the first light guide tube 4 and a cross point formed by the third light-passing component 83 in the second light guide tube 81 can be used to determine the error degree between the tilt angle of the lens 2 to be tested and the standard angle of 45°, or to determine the error degree between the installation position of the lens 2 to be tested and the standard position.

[0058] The measurement accuracy of the lens installation accuracy measurement system can be determined by the distance h between the center of the light beam emitted by the light source 3 and the center of the third light-transmitting component 83 along the axial direction of the second light-guiding tube 81 (tangent theorem of trigonometric functions).

[0059] The embodiment of the present application also provides a method for measuring lens installation accuracy, which may include the following steps:

[0060] 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 the lens barrel 1 in parallel, and then is reflected by the lens 2 to be tested and then is emitted through the second light guide tube 81, and a projection pattern is projected onto the observation plate 82 located at the emission port of the second light guide tube 81; 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 second light guide tube 81 is physically connected to the second interface 12, the second light guide tube 81 is provided with a third light-transmitting component 83, and the centers of the first, second and third light-transmitting components 83 all have the same characteristic structure 7.

[0061] S2: Acquire a projection pattern of the reflected light from the observation plate 82, and determine the installation accuracy of the lens 2 to be tested based on the distance deviation between 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 and the positions of the characteristic points formed on the projection pattern by the characteristic structures 7 of the third light-transmitting component 83.

[0062] The lens installation accuracy measurement method of this embodiment can be measured using the lens installation accuracy measurement system provided in any of the above embodiments to achieve corresponding functions, which will not be described in detail here.

[0063] 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 can be emitted through the second light guide tube 81 after being reflected by the lens to be tested. The projection pattern of the reflected light can be received by the observation plate 82. The installation accuracy of the lens to be tested 2 can be determined based on the distance deviation between the position of the characteristic point formed on the projection pattern by the characteristic structure 7 of the first light-transmitting component 5 and the second light-transmitting component 6 in the first light guide tube 4 and the position of the characteristic point formed on the projection pattern by the characteristic structure 7 of the third light-transmitting component 83 in the second light guide tube 81. The installation position and inclination 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. In this way, the installation accuracy of the lens to be tested 2 on the optical path that does not participate in imaging can be measured, which solves the technical problem that the optical path that does not participate in imaging cannot be measured in the related art.

[0064] Furthermore, in one embodiment, the above step S2 may include:

[0065] S21: Compare the distance deviation between the positions of characteristic points formed by the characteristic structures 7 of the first light-transmitting component 5 and the second light-transmitting component 6 on the projection pattern of the observation plate 82 and the positions of characteristic points formed by the characteristic structure 7 of the third light-transmitting component 83 on the projection pattern of the observation plate 82.

[0066] S22: Determine the installation accuracy of the lens 2 to be tested based on the distance deviation.

[0067] In this embodiment, the first light-transmitting component 5, the second light-transmitting component 6 and the third light-transmitting component 83 are all crosshairs with the same structure. In this case, the characteristic point on the projection pattern is the cross intersection point of the center of the crosshairs. Figure 6 As shown, when the tilt angle and installation position of the lens 2 to be tested meet the requirements (that is, the tilt angle is a standard 45°, and the installation position is a standard position, where the standard position is the intersection of the axes of the first light guide tube 4 and the second light guide tube 81), only one cross intersection point is observed on the observation plate 82 (the three cross intersection points completely overlap), for example Figure 7 FIG. 8 is a diagram showing that the angles of the crosshairs in the first light guide tube 4 and the second light guide tube 81 are completely consistent, and FIG. 8 is a diagram showing that the angles of the crosshairs in the first light guide tube 4 and the second light guide tube 81 are not completely consistent. However, regardless of whether the angles of the crosshairs are consistent, the central intersection points of the three crosshairs intersect at the same point; see FIG. Figure 8 As shown, 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), two cross intersections are observed on the observation plate 82, wherein the cross intersections of the two cross hairs in the first light guide tube 4 are coincident, and the cross intersection of the cross hairs in the first light guide tube 4 is located on the left side of the cross intersection of the cross hairs in the second light guide tube 81 ( Fig. 9 See Fig.10 As shown, 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), two cross intersections are observed on the observation plate 82, wherein the cross intersections of the two cross hairs in the first light guide tube 4 coincide with each other, and the cross intersection of the cross hairs in the first light guide tube 4 is located to the right of the cross intersection of the cross hairs in the second light guide tube 81 ( Fig.11 Therefore, by comparing the cross points on the observation plate 82, it can be known whether the tilt angle and installation position of the lens 2 to be tested meet the requirements; at the same time, according to the distance between the two cross points on the observation plate 82, the specific deviation values ​​between the tilt angle and installation position of the lens 2 to be tested and the standard angle and standard position can be known, and then the corresponding angle or distance can be adjusted.

[0068] Furthermore, in one embodiment, before installing the second light guide tube 81, 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 passes through the first light guide tube 4 and is incident on the lens 2 to be tested in the lens barrel 1 , and the light reflected by the lens 2 to be tested is projected onto the observation plate 82 .

[0070] Step b: based on the positions of characteristic points formed by the characteristic structures 7 of the first light-transmitting component 5 and the second light-transmitting component 6 on the observation plate 82 on the projection pattern, determine whether the optical axis of the light source 3 is parallel to the axis of the first light guide tube 4 .

[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 observation board 82 to form a projection pattern. If two non-concentric feature points are observed in the projection pattern on the observation board 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 cross hairs, a cross shadow will be observed on the observation board 82. When only one cross shadow can be observed from 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, and then the installation accuracy of the lens 2 to be tested can be measured.

[0074] Furthermore, in one embodiment, if the installation accuracy is less than a preset value, the inclination angle or the installation position of the lens to be tested 2 is adjusted, and the positions of 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 projection pattern are compared with the positions of the characteristic points formed by the characteristic structure 7 of the third light-transmitting component 83 on the projection pattern until the installation accuracy reaches the preset value.

[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; A second light guide tube (81) which is physically connected to the second interface (12); a third light-transmitting component (83) is arranged inside the second light guide tube (81); the centers of the first, second and third light-transmitting components all have the same characteristic structure (7); A light source (3), wherein the lens barrel (1), the first light guide barrel (4), and the second light guide barrel (81) are all located on the optical path of the light source (3), and light emitted by the light source (3) passes through the first light guide barrel (4) and is incident in parallel on the lens to be tested (2) in the lens barrel (1), and is reflected by the lens to be tested (2) and then emitted through the second light guide barrel (81); An observation plate (82) is located at the exit of the second light guide tube (81) and is used to receive a projection pattern of reflected light and determine the installation accuracy of the lens (2) to be tested based on a distance deviation between the position of a feature point formed on the projection pattern by the feature structure (7) of the first light-transmitting component (5) and the second light-transmitting component (6) and the position of a feature point formed on the projection pattern by the feature structure (7) of the third light-transmitting component (83).

2. The lens installation accuracy measurement system according to claim 1, characterized in that: The first light-transmitting component (5), the second light-transmitting component (6) and the third light-transmitting component (83) are all crosshairs; the intersection of the crosshairs of the first light-transmitting component (5) and the second light-transmitting component (6) is located on the axis of the first light-guiding tube (4); the intersection of the crosshairs of the third light-transmitting component (83) is located on the central axis of the lens tube (1); 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: Central through holes are provided at the intersections of the crosshairs of the first light-transmitting component (5), the second light-transmitting component (6) and the third light-transmitting component (83).

4. The lens installation accuracy measurement system according to claim 1, characterized in that: The first light-transmitting component (5), the second light-transmitting component (6) and the third light-transmitting component (83) are all 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 tube (4); the central through hole of the third light-transmitting component (83) is located on the central axis of the lens tube (1); 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 viewing plate (82) is provided with concentric rings with scales.

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 is then reflected by the lens to be tested (2) and emitted through the second light guide tube (81), and a projection pattern is projected onto an observation plate (82) located at the emission port of the second light guide tube (81); 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 barrel (4) is physically connected to the first interface (11), the first light guide barrel (4) is provided with identical first light-transmitting components (5) and second light-transmitting components (6) at intervals, the second light guide barrel (81) is physically connected to the second interface (12), the second light guide barrel (81) is provided with a third light-transmitting component (83), and the centers of the first, second and third light-transmitting components all have the same characteristic structure (7); A projection pattern of reflected light is obtained from the observation plate (82), and the installation accuracy of the lens (2) to be tested is determined based on the distance deviation between the position of a feature point formed on the projection pattern by the feature structure (7) of the first light-transmitting component (5) and the second light-transmitting component (6) and the position of a feature point formed on the projection pattern by the feature structure (7) of the third light-transmitting component (83).

7. The lens installation accuracy measurement method according to claim 6, characterized in that: Comparing the distance deviation between the position of the characteristic point formed by the characteristic structure (7) of the first light-transmitting component (5) and the second light-transmitting component (6) on the projection pattern of the observation plate (82) and the position of the characteristic point formed by the characteristic structure (7) of the third light-transmitting component (83) on the projection pattern of the observation plate (82); The installation accuracy of the lens (2) to be tested is determined based on the distance deviation.

8. The lens installation accuracy measurement method according to claim 6, characterized in that: Before installing the second light guide tube (81), 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 observation plate (82); Based on the positions of 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 observation plate (82), 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).

9. The lens installation accuracy measurement method according to claim 6, characterized in that: If the installation accuracy is less than a preset value, the tilt angle or installation position of the lens (2) to be tested is adjusted, and 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) are compared with the positions of the characteristic points formed on the projection pattern by the characteristic structures (7) of the third light-transmitting component (83), until the installation accuracy reaches the preset value.

Images