Lens installation accuracy measurement system and lens installation accuracy measurement method

Abstract

The present application relates to a lens installation accuracy measurement system and 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 having a first interface and the other adjacent side having a second interface; a first light guide barrel, which is physically connected to the first interface, and an identical first light-transmitting component and a second light-transmitting component are spaced apart in the first light guide barrel, and the centers of the first and second light-transmitting components have the same characteristic structure; an objective lens is physically connected to the second interface, and a camera and the objective lens are located on opposite sides of the lens barrel; the lens barrel, the first light guide barrel, and the objective lens are all located on the optical path of a light source, so that light emitted by the light source passes through the first light guide barrel and is incident in parallel on the lens to be measured in the lens barrel. After being reflected by the lens to be measured, the light is emitted through the objective lens to an observation plate, and the observation plate is imaged by the camera. The present application cleverly solves the technical problems of low measurement efficiency and accuracy of lens installation accuracy by this method.

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 the prior art, 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 position and angle of the installed lens are correct. However, this measurement method has low efficiency and accuracy.

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

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

[0007] In a first aspect, an embodiment of the present application provides a lens mounting accuracy measurement system, which includes: a lens barrel, in which a lens to be measured is obliquely mounted, one side of the lens barrel having a first interface, and the other adjacent side having 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-transmitting components at intervals, and the centers of the first and second light-transmitting components have the same characteristic structure; an objective lens and a camera, wherein the objective lens is physically connected to the second interface, and the camera and the objective lens are located on opposite sides of the lens barrel; a light source, wherein the lens barrel, the first light guide barrel, and the objective lens 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 after being reflected by the lens to be measured, is emitted through the objective lens to an observation plate, and the camera images the observation plate.

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

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

[0010] In combination with the first aspect, in one embodiment, the first light-transmitting component and the second light-transmitting component are both 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, and the characteristic structure is a central through hole.

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

[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 irradiated on the object to be tested through the objective lens.

[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 is spaced apart from the first light guide and the second light guide is spaced apart from the first light guide, the centers of the first and second light guides have the same characteristic structure, and the objective lens is physically connected to the second interface;

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

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

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

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

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

[0020] 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 object to be measured;

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

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

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

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

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the 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.

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

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

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

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

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

[0031] 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;

[0032] Figure 7 for Figure 6 Schematic diagram of the camera shooting to form an imaging picture;

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

[0034] Figure 9 for Figure 8 Schematic diagram of the camera shooting to form an imaging picture;

[0035] 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;

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

[0037] In the picture:

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

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

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

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

[0042] In order to enable those skilled in the art to better understand the 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.

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

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

[0045] See also Figure 1As shown, in this embodiment, the light source 3 is preferably a beam 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 (the standard position here is selected as the intersection position of the axes of the first light guide tube 4 and the objective lens 84). In this embodiment, when using the above-mentioned lens installation accuracy measurement system to test the installation accuracy of the lens 2 to be tested, 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 via a thread. The first light-transmitting component 5 and the second light-transmitting component 6 are spaced apart within the first light guide tube 4 along the axis 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 objective lens 84 is preferably installed via a thread into the second interface 12 of the lens barrel 1, so that light emitted by the light source 3 can pass through the first and second light-transmitting components 5 and 6 to illuminate the lens 2 to be tested, and then be reflected by the lens 2 to be illuminated through the second interface 12 to the objective lens 84. The arrows in the figure indicate the direction of the light beam.

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

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

[0048] This embodiment arranges a lens barrel 1, on which the lens 2 to be tested is mounted, a first light guide tube 4, on which the first and second light passing components 5 and 6 are mounted, and an objective lens 84 in the optical path of a light source 3. Light emitted by the light source 3 can pass through the first light guide tube 4 and be incident in parallel on the lens 2 to be tested. After being reflected by the lens 2 to be tested, it can be emitted through the objective lens 84 to an observation plate 82. The observation plate 82 can be imaged by a camera 85 to obtain an image. The installation accuracy of the lens 2 to be tested can be determined based on the deviation between the characteristic points formed on the image by the characteristic structures 7 of the first and second light passing components 5 and 6 and the center point of the image. 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 accuracy of the lens. This method cleverly solves the technical problem of low efficiency and accuracy in measuring lens installation accuracy in related technologies. The lens installation accuracy measurement system provided in this embodiment is primarily suitable for measuring the installation accuracy of the lens 2 to be tested in the imaging optical path. At the same time, the measurement accuracy of the lens installation accuracy measurement system in this embodiment can be determined by the distance h between the center of the light beam emitted by the light source 3 and the observation plate 82 along the axis direction of the objective lens 84 (trigonometric tangent theorem).

[0049] Furthermore, in one embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 are both crosshairs, the intersection of the two crosshairs is located on the axis of the first light-guiding cylinder 4, and the characteristic structure 7 is the intersection of the centers of the crosshairs. In this embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 have the same structure and preferably use crosshairs, see Figures 3 to 5 The following are three preferred crosshair configurations: the first crosshair has no central hole; the second crosshair has a central hole for easy alignment; and the third crosshair, or aperture, has only a central hole. Of course, in other embodiments, apertures of other configurations can be used in place of the first and second light-transmitting components 5 and 6, respectively, to achieve the present invention. For the first crosshair, the characteristic structure 7 is the solid cross intersection at the center of the crosshairs; for the second crosshair, the characteristic structure 7 is the cross structure at the center of the crosshairs plus the central hole; and for the third crosshair, the characteristic structure 7 is the central hole.

[0050] 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 the center point of the image 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 arrangement ensures that the axes of the two crosshairs are aligned.

[0051] On the basis of the above technical solution, preferably, see Figure 4 As shown, the intersection of the cross hairs is provided with a central through hole. Figure 4 The crosshairs shown are the preferred solution of the present application. The centers of the first light-transmitting component 5 and the second light-transmitting component 6 not only have a crosshair structure, but also have a 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.

[0052] Furthermore, in one embodiment, the first light-transmitting component 5 and the second light-transmitting component 6 are components with a central through hole, the central through holes of the first light-transmitting component 5 and the second light-transmitting component 6 are located on the axis of the first light guide cylinder 4, and the characteristic structure 7 is a central through hole. Figure 4 and Figure 5 As shown, in this embodiment, the first and second optical components 5 and 6 can each be a circular plate, a square plate, or other structures. The central through-holes of the first and second optical components 5 and 6 can be circular holes or holes of various other shapes. The central through-holes of the first and second optical components 5 and 6 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 and second optical components 5 and 6 and illuminate the lens under test 2. After being reflected by the lens under test 2, light is emitted through the objective lens 84 and onto the observation plate 82.

[0053] See also Figure 2As shown, in the above embodiment, before testing the installation accuracy of the lens 2 to be tested, the objective lens 84 and the camera 85 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 tube 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 tube 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 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.

[0054] It should be understood that when detecting whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4, the first light guide tube 4 can also be installed at the second interface 12 position of the lens barrel 1, so that the incident light is reflected by the lens 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.

[0055] Furthermore, when detecting whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4, the objective lens 84 can be mounted to the second interface 12, and the camera 85 (ie Figure 1 The structure shown in FIG. 1 is shown in FIG. 1 , and a camera 85 is used to photograph the observation plate 82 to obtain an image. The two characteristic points in the image are observed to determine whether the light beam emitted by the light source 3 is parallel to the axis of the first light guide tube 4. If only one characteristic point is observed in the image, it can be assumed that the light beam from the light source 3 is parallel to the axis of the first light guide tube 4.

[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. When the light source 3 emits a light beam, if the cross intersection is observed to coincide with the center point of the imaging image (wherein the cross intersection is a characteristic point formed by the projection of the characteristic structure 7 at the center of the first light-transmitting component 5 and the second light-transmitting component 6), it is proved that the tilt angle and installation position of the lens to be tested 2 meet the requirements (that is, the tilt angle is 45° and the installation position is also in the standard position); if the cross intersection is observed to not coincide with the center point of the imaging image, it is proved that the tilt angle and / or installation position of the lens to be tested 2 do not meet the requirements. When the cross intersection is observed to not coincide with the center point of the imaging image, the installation accuracy of the lens to be tested 2 can be determined based on the degree of deviation of the cross intersection relative to the center point of the imaging image.

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

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

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

[0061] S1: Turn on the light source 3 so that the light emitted by the light source 3 passes through the first light guide tube 4 and is incident parallel to the lens to be tested 2 in the lens barrel 1. After being reflected by the lens to be tested 2, the light is illuminated by the objective lens 84 onto the object to be tested. The lens to be tested 2 is installed obliquely in the lens barrel 1. One side of the lens barrel 1 has a first interface 11, and the other side of the lens barrel 1 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 centers of the first and second light-transmitting components 6 have the same characteristic structure 7. The objective lens 84 is physically connected to the second interface 12.

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

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

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

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

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

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

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

[0069] Step a: Turn on the light source 3 so that the light emitted by the light source 3 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 object to be tested.

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

[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-passing component 5 and the second light-passing component 6 and then illuminate the lens 2 to be tested. After being reflected by the lens 2, the reflected light is projected onto the object to be tested to form a projection pattern. If two non-concentric characteristic points are observed in the projection pattern on the object to be tested, 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 assumed 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-passing component 5 and the second light-passing component 6 use crosshairs, a cross shadow will be observed on the object to be tested. If only one cross shadow is observed on the object to be tested, it can be assumed that the light beam emitted by the light source 3 is parallel to the axis of the first light guide 4. If the above observation shows that the light beam emitted by the light source 3 is not parallel to the axis of the first light guide 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 4.

[0074] Furthermore, in one embodiment, if the characteristic point formed by the characteristic structure 7 of the first optical transmission component 5 and the second optical transmission component 6 on the imaging image deviates from the center point of the imaging image, the position of the lens to be tested 2 is adjusted until the characteristic point coincides with the center point of the imaging image, and the position includes the installation position and tilt angle of the lens to be tested 2.

[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 cylinder (4) physically connected to the first interface (11), wherein identical first light-transmitting components (5) and second light-transmitting components (6) are spaced apart in the first light guide cylinder (4), and the centers of the first and second light-transmitting components both have identical characteristic structures (7); an objective lens (84) and a camera (85), wherein the objective lens (84) is physically connected to the second interface (12), and the camera (85) and the objective lens (84) are located on opposite sides of the lens barrel (1); A light source (3), the lens barrel (1), the first light guide barrel (4), and the objective lens (84) are all located on the optical path of the light source (3), so that the light emitted by the light source passes through the first light guide barrel (4) and is incident in parallel on the lens to be tested (2) in the lens barrel (1), is reflected by the lens to be tested (2), and is emitted through the objective lens (84) to the observation plate (82), and the observation plate (82) is imaged by the camera (85).

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

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

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

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

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

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

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

9. The lens installation accuracy measurement method according to claim 6, wherein: Before installing the objective lens (84), the method further comprises: Turning on the light source so that the light emitted by the light source (3) passes through the first light guide tube (4) and is incident on the lens to be tested (2) in the lens tube (1), and the light reflected by the lens to be tested (2) is projected onto the object to be tested; Based on the positions of characteristic points formed on the projection pattern by the characteristic structures (7) of the first light-transmitting component (5) and the second light-transmitting component (6) on the object to be measured, it is determined whether the optical axis of the light source (3) is parallel to the axis of the first light 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).

10. The lens installation accuracy measurement method according to claim 6, wherein: If a characteristic point formed on the imaging screen by the characteristic structure (7) of the first light-transmitting component (5) and the second light-transmitting component (6) deviates from the center point of the imaging screen, the position of the lens (2) to be tested is adjusted until the characteristic point coincides with the center point of the imaging screen, and the position includes the installation position and tilt angle of the lens (2) to be tested.

Images