Lens installation accuracy measurement system and lens installation accuracy measurement method

Abstract

The present application relates to a lens installation accuracy measurement system and a lens installation accuracy measurement method. The lens installation accuracy measurement system includes: a lens barrel, in which a lens to be measured is installed at an angle, 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 is provided with identical first and second light guide components at intervals; a second light guide barrel, which is physically connected to the second interface, and the second light guide barrel is provided with a third light guide component, and the centers of the three light guide components have the same characteristic structure; 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; an observation plate is located at the exit of the second light guide barrel, and is used to receive the projection pattern of the reflected light. The method of the present application can measure the installation accuracy of the lens to be measured on the optical path that does not participate in imaging, solving the technical problem in the related art that the optical path that does not participate in imaging cannot be measured.

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] Currently, 45° reflectors or beamsplitters are used in many areas of industrial visual inspection. For example, 45° beamsplitters are used inside telecentric lenses to achieve coaxial illumination, and they are often used inside microscope tubes to achieve coaxial illumination. Laser autofocus, which requires a coaxial optical path, also uses 45° laser beamsplitters. In some high-precision imaging optical paths, 45° reflectors are also used instead of right-angle prisms when the optical path turns, as right-angle prisms change the optical path and thus affect image quality.

[0003] In the above scenarios, especially in the fields 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 related technologies, a light source is typically connected directly to the entrance of the tube lens housing, and then the brightness uniformity of the image is observed at the imaging end to determine whether the lens position and angle are correct. However, this method can only measure the imaging optical path and cannot measure optical paths that do not participate in 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, embodiments of the present application provide a lens installation accuracy measurement system, comprising: a lens barrel, in which a lens to be tested is obliquely mounted, the lens barrel having a first interface on one side and a second interface on the other adjacent side; a first light guide barrel physically connected to the first interface, wherein identical first and second light-transmitting components are spaced apart within the first light guide barrel; a second light guide barrel physically connected to the second interface, wherein a third light-transmitting component is disposed within the second light guide barrel, wherein the centers of the first, second, and third light-transmitting components all have identical characteristic structures; a light source, wherein the lens barrel, the first light guide barrel, and the second light guide barrel are all located in an optical path of the light source, and light emitted by the light source passes through the first light guide barrel and is incident parallel to the lens to be tested in the lens barrel, and then is reflected by the lens to be tested and then emitted through the second light guide barrel; and an observation plate located at an exit port of the second light guide barrel, for receiving a projection pattern of the reflected light and determining the installation accuracy of the lens to be tested based on a distance deviation between the positions of characteristic points formed on the projection pattern by the characteristic structures of the first and second light-transmitting components and the positions of characteristic points formed on the projection pattern by the characteristic structure of the third light-transmitting 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 is located on the axis of the first light-guiding tube, the intersection of the cross hairs of the third light-transmitting component is located on the central axis of the lens barrel, and the characteristic structure is the intersection of the centers of the cross hairs.

[0009] In combination with the first aspect, in one embodiment, 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 with 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 barrel, 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 includes 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 barrel. After being reflected by the lens to be tested, the light is emitted through the second light guide tube and a projection pattern is projected onto the observation plate located at the exit of the second light guide tube.

[0014] The lens to be tested is obliquely mounted in the lens barrel. One side of the lens barrel has a first interface, and the other adjacent side has a second interface. The first light guide is physically connected to the first interface. The first light guide has two identical first and second light-transmitting components spaced apart therefrom. The second light guide is physically connected to the second interface. The second light guide has a third light-transmitting component disposed therein. The centers of the first, second, and third light-transmitting components all have the same characteristic structure.

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

[0016] In combination with the second aspect, in one embodiment, the distance deviation between the positions of the characteristic points formed by the characteristic structures of the first and second light-transmitting components on the projection pattern of the observation plate and the position of the 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 embodiment, before installing the second light guide cylinder, 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] determining whether the optical axis of the light source is parallel to the axis of the first light guide cylinder based on positions of characteristic points formed on the projection pattern by characteristic structures of the first light-transmitting component and the second light-transmitting component on the observation plate;

[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 cylinder.

[0021] In combination with the second aspect, in one embodiment, if the installation accuracy is less than a preset value, the inclination angle or 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 of the technical solutions 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 guide barrel on which a third light-transmitting component are installed in 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 then be reflected by the lens to be tested and emitted through the second light guide barrel. The projection pattern of the reflected light is received by an observation plate, and the installation accuracy of the lens to be tested can be determined based on the distance deviation between the position of the characteristic point formed on the projection pattern by the characteristic structures of the first light-transmitting component and the second light-transmitting component in the first light guide barrel and the position of the characteristic point formed on the projection pattern by the characteristic structure of the third light guide barrel in the second light guide barrel. In this way, the installation accuracy of the lens 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0025] Figure 1 A schematic structural diagram 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 according to an embodiment of the present application;

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

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

[0030] Figure 6 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 Schematic diagram of another type of 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] Figure 9 (a) is Figure 8 Schematic diagram of a characteristic point formed on the observation plate, (b) Figure 8 Schematic diagram of another type of characteristic point formed on the observation plate;

[0034] Figure 10 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] Figure 11 (a) is Figure 10 Schematic diagram of a characteristic point formed on the observation plate, (b) Figure 10 Schematic diagram of another type of feature point formed on the observation plate.

[0036] In the picture:

[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-transmitting component; 6. Second light-transmitting 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 present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, 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 having a first interface 11, and the other side adjacent thereto having a second interface 12; a first light guide barrel 4, which is physically connected to the first interface 11, and in which the first light guide barrel 4 is provided with identical first and second light passing components 5 and 6 at intervals; a second light guide barrel 81, which is physically connected to the second interface 12, and in which the second light guide barrel 81 is provided with a third light passing component 83, and the centers of the first, second, and third light passing 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 barrel 4. and the second light guide tube 81 are both located on the optical path of the light source 3, and allow the light emitted by the light source 3 to pass through the first light guide tube 4 and be incident in parallel on the lens 2 to be tested in the lens barrel 1, 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 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 expander 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 set 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 to be tested 2 in this embodiment can be a reflector or a spectroscope lens, 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 to be tested 2 in the lens barrel 1 is 45°, and can detect whether the installation position of the lens to be tested 2 is the standard position. In this embodiment, when the above-mentioned lens installation accuracy measurement system is used to detect the installation accuracy of the lens to be tested 2, the axis of the light source 3 is collinear 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 a thread, and the first light-transmitting component 5 and the second light-transmitting component 6 in the first light guide tube 4 are spaced apart along the axis direction of the first light guide tube 4. The first light-transmitting component 5 and the second light-transmitting component 6 have the same structure. The second light guide tube 81 is preferably installed to the second interface 12 of the lens barrel 1 by a thread, so that the light emitted by the light source 3 can pass through the first light-transmitting component 5 and the second light-transmitting component 6 to irradiate the lens to be tested 2, and then be reflected by the lens to be tested 2 and irradiate into the second light guide tube 81 through the second interface 12.

[0045] In the above embodiment, the structure of the third light-transmitting component 83 may be completely identical to or different from the structure of the first light-transmitting component 5 , but 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 outside 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 on which the lens to be tested 2 is mounted, a first light guide barrel 4 on which the first light passing component 5 and the second light passing component 6 are mounted, and a second light guide barrel 81 on which the third light passing component 83 is mounted are arranged in the optical path of the light source 3. 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 pass through the first light guide barrel 4 and be incident on the lens to be tested 2 in parallel. After being reflected by the lens to be tested 2, it can be emitted through the second light guide barrel 81. The projection pattern of the reflected light can be received by 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 received by the observation plate 82. The installation accuracy of the lens 2 to be tested can be determined by 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. 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. 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-transmitting component 83 is coaxially arranged with the second light guide tube 81 within the second light guide tube 81. In this embodiment, the structural shape of the third light-transmitting component 83 is preferably set to be consistent with the structural shape of the first light-transmitting component 5 and the second light-transmitting component 6 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-transmitting component 83 can be integrally formed within the second light guide tube 81, or it can be formed separately, for example, an aperture or crosshairs structure can be installed within the second light guide tube 81, and the characteristic structure 7 can be set at the center of the aperture and crosshairs.

[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] Furthermore, 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, and the intersection of the crosshairs of the third light-transmitting component 83 is located on the central axis of the lens barrel 1. 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, three preferred crosshair structures are shown. 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, also known as an aperture, 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, the second light-transmitting component 6, and the third light-transmitting component 83, and the solution of the present application can still be implemented. For the first crosshair, the characteristic structure 7 is the solid cross intersection in the center of the crosshairs; for the second crosshair, the characteristic structure 7 is the cross structure in the center of the crosshairs 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 structure is preferably employed within the first light guide tube 4. This allows the light beam, after being reflected by the lens 2 under test, to form a projection pattern on the observation plate 82 with a characteristic cross-shaped point at its center. This facilitates locating the characteristic point and subsequently facilitating comparison of the cross-shaped point with other positional references to identify positional deviations. Furthermore, the crosshairs in this embodiment can be precisely machined to ensure their location at the center of the first light guide tube 4. This configuration of the first light guide tube 4 ensures that the axes of the two crosshairs are aligned.

[0052] On the basis of 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 can form a "cross"-shaped feature point with a center point, which is conducive to judging whether the center of the feature point is aligned, finding deviations, and making judgments more accurate and faster.

[0053] Furthermore, 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 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 guide tube 4, and the central through hole of the third light-transmitting component 83 is located on the central axis of the lens barrel 1. 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, square plates, or other structures. 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. 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 aforementioned centrally located characteristic structures 7. Light emitted by the light source 3 can pass through the central through-holes of the first light-transmitting component 5, the second light-transmitting component 6, and illuminate the lens under test 2. After being reflected by the lens under test 2, it is emitted through the second light guide 81 and onto the observation plate 82, forming a projection pattern. Simultaneously, the reflected light also passes through the center of the third light-transmitting component 83 in the second light guide 81 and illuminates the observation plate 82.

[0054] See also Figure 2 As shown, in the above embodiment, before testing the installation accuracy of the lens 2 to be tested, the second light guide 81 can be removed and the first light passing assembly 5 and the second light passing assembly 6 can be used to test whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide 4. In other words, two points form a line to determine whether the light beam emitted by the light source 3 is perpendicularly incident on the first interface 11. Specifically, when the light source 3 is turned on, the light beam emitted by the light source 3 can pass through the first light passing assembly 5 and the second light passing assembly 6 and then illuminate the lens 2 to be tested. After being reflected by the lens 2 to be tested, the reflected light is projected onto the observation plate 82 to form a projection pattern. If two non-concentric characteristic points are observed in the projection pattern on the observation plate 82, it indicates that the light beam emitted by the light source 3 is not parallel to the axis of the first light guide 4. If only one characteristic point is observed (in this case, the two characteristic points coincide), it can be considered that the light beam emitted by the light source 3 is parallel to the axis of the first light guide 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 plate 82. When only one cross shadow is observed on the observation plate 82, it can be assumed 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.

[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 to be tested 2 and then 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 mounting accuracy measurement system can 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 back 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, and the third light-transmitting component 83 in the second light-guiding tube 81 also uses crosshairs. The third light-transmitting component 83 has the same structural shape as the first light-transmitting component 5 and the second light-transmitting component 6, and concentric rings with scales can be provided 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 installation position of the lens under test 2 meet the requirements (i.e., the inclination angle is 45° and the installation position is also in the standard position); that is, the three points are collinear and the 45° inclination angle and installation position of the lens under test 2 are accurate. If the centers of the two cross intersections observed on the observation plate 82 do not overlap (wherein the two cross intersections in the first light-guiding tube 4 overlap), it indicates that the installation position or inclination angle of the lens under test 2 does not meet the requirements. When the centers of the two cross intersections observed on the observation plate 82 do not coincide, the distance between the centers of the two cross intersections can be observed on the observation plate 82 using the scale. The installation position or tilt angle value that needs to be adjusted for the lens 2 to be tested can be determined based on this distance (the correspondence between the distance and the angle value or installation position to be adjusted can be calibrated using a collimated and expanded laser). That is, the degree of error between the tilt angle of the lens 2 to be tested and the standard angle of 45° can be determined by measuring the distance between a cross intersection formed by two points in the first light guide tube 4 and a cross intersection formed by the third light-passing component 83 in the second light guide tube 81. Alternatively, the degree of error between the installation position of the lens 2 to be tested and the standard position can be determined.

[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 axis of the second light-guiding tube 81 (tangent theorem of trigonometric functions).

[0059] The present application also provides a lens installation accuracy measurement method, 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 parallel to the lens under test 2 in the lens barrel 1. After being reflected by the lens under test 2, the light is emitted through the second light guide tube 81, and a projection pattern is projected onto the observation plate 82 located at the exit of the second light guide tube 81. The lens under test 2 is obliquely mounted 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. Identical first and second light-transmitting components 5 and 6 are spaced apart in the first light guide tube 4. The second light guide tube 81 is physically connected to the second interface 12. A third light-transmitting component 83 is disposed in the second light guide tube 81. The centers of the first, second, and third light-transmitting components 83 all have the same characteristic structure 7.

[0061] S2: Obtain a projection pattern of the reflected light from the observation plate 82, and determine the installation accuracy of the lens to be tested 2 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 structure 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 pass through the first light guide tube 4 and be incident on the lens to be tested 2 in parallel. After being reflected by the lens to be tested 2, it can be emitted through the second light guide tube 81. The projection pattern of the reflected light is 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 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. 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 in the related art that the optical path that does not participate in imaging cannot be measured.

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

[0065] S21: Compare the distance deviation between 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 of the observation plate 82 and the positions of the 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 equipped with the same cross hair structure. In this case, the characteristic point on the projection pattern is the cross intersection point of the cross hair center. Figure 6 As shown, when the tilt angle and installation position of the lens to be tested 2 meet the requirements (that is, the tilt angle is the standard 45°, and the installation position is the 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 coincide with each other), for example Figure 7 As shown, Figure (a) shows that the angles of the cross hairs in the first light guide tube 4 and the second light guide tube 81 are completely consistent, and Figure (b) shows that the angles of the cross hairs 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 cross hairs are consistent or not, the central intersection point of the three cross hairs is the same point; see Figure 8 As shown, when the tilt angle and installation position of the lens to be tested 2 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 coincide with each other, and the cross intersection of the cross hairs in the first light guide tube 4 is located to the left of the cross intersection of the cross hairs in the second light guide tube 81 ( Figure 9 shown); see Figure 10 As shown, when the tilt angle of the lens to be tested 2 meets the requirement but the installation position does not meet the requirement (that is, the tilt angle is 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 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 ( Figure 11 Therefore, by comparing the cross points on the observation plate 82, it can be determined whether the tilt angle and installation position of the lens to be tested 2 meet the requirements; and at the same time, the specific deviation between the tilt angle and installation position of the lens to be tested 2 and the standard angle and standard position can be determined based on the distance between the two cross points on the observation plate 82, so that corresponding angle or distance adjustments can be made.

[0068] Furthermore, in one embodiment, the following steps may be included before installing the second light guide tube 81:

[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 to be tested 2 in the lens barrel 1 . The light reflected by the lens to be tested 2 is projected onto the observation plate 82 .

[0070] Step b: Based on 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 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 testing 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 illuminate the lens 2 to be tested. After being reflected by the lens 2 to be tested, the reflected light is projected onto the observation plate 82 to form a projection pattern. If two non-concentric characteristic 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 characteristic point is observed (in this case, the two characteristic points coincide), it can be assumed 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 plate 82. When only one cross shadow is observed on the observation plate 82, it can be assumed 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, 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 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 this application, it should be noted that the terms "upper" and "lower" and the like 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 this application and simplifying the description, and do not indicate or imply 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 this 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 an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this 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 used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any 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 comprising 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, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0078] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

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 in 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) 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) physically connected to the second interface (12); a third light-transmitting component (83) being provided in the second light guide tube (81); the centers of the first, second and third light-transmitting components all having the same characteristic structure (7); A light source (3), 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), so that 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 to determine the installation accuracy of the lens (2) to be tested based on a distance deviation between the position of a 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 a characteristic point formed on the projection pattern by the characteristic structure (7) of the third light-transmitting component (83).

2. The lens installation accuracy measurement system according to claim 1, wherein: 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 barrel (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, wherein: A central through hole is provided at the intersection 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, wherein: 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 barrel (1); and the characteristic structure (7) is a central through hole.

5. The lens installation accuracy measurement system according to claim 1, wherein: 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), is reflected by the lens to be tested (2) and then is emitted through the second light guide tube (81), and a projection pattern is projected onto an observation plate (82) located at the exit of the second light guide tube (81); The lens (2) to be tested is obliquely mounted 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 a distance deviation between the position of a characteristic point 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 position of a characteristic point formed on the projection pattern by the characteristic structure (7) of the third light-transmitting component (83).

7. The lens mounting accuracy measurement method according to claim 6, wherein: comparing 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 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, wherein: Before installing the second light guide cylinder (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 guide 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 cylinder (4).

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

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