Lens focusing and resolution evaluation device

Abstract

The utility model discloses a lens focusing and resolution evaluation device, and relates to the field of optical lenses. The lens focusing and resolution evaluation device comprises a camera, and the camera comprises a camera body and a to-be-evaluated lens arranged on the camera body; mounting plates are arranged on one side of the camera at intervals, a to-be-evaluated lens is arranged towards the mounting plates, and the camera can move relative to the mounting plates to be close to or away from the mounting plates; the surface of the mounting plate is provided with a resolution block module, the resolution block module comprises a plurality of stripe resolution units of which the lengths are sequentially reduced, the distance between the to-be-evaluated lens and the mounting plate is moved, and images of the resolution block module in a central view field and an edge view field are shot through the to-be-evaluated lens; and reading the definition of each stripe resolution unit in the image, and focusing the unit to be evaluated according to the definition of the stripe resolution unit in the central field of view. According to the device, lens focusing and resolution evaluation can be completed in a time-saving and efficient manner, the evaluation process is simple to operate, and the cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the field of optical lenses, and in particular to a lens focusing and resolution evaluation device. Background Art

[0002] Nowadays, lenses play an extremely important role in the field of precision manufacturing. The focusing quality and resolution level of the lens directly affect the accuracy of precision instruments.

[0003] When evaluating the focus of a lens, existing precision instruments usually adjust the front and rear focus positions of the lens to find the position where the image is clearest. However, due to the focal depth of the lens, the position where the clearest focus is is within an adjustment range. For some precision instruments, such as 3D scanners, slight changes in the front and rear positions of the focus position will directly lead to huge changes in clarity within the front and rear depth of field measurement range, making it inconvenient to evaluate the focus of the lens.

[0004] When evaluating resolution, an MTF instrument is usually used for direct measurement. This measurement method is inefficient and the instrument is expensive, so it is difficult to meet the requirements of full inspection for mass production. Alternatively, a resolution board is used for imaging or projection measurement. This measurement method requires the naked eye to observe whether the resolution stripes are clear, and has low accuracy. Utility Model Content

[0005] The utility model aims to provide a lens focus and resolution evaluation device, which can complete the evaluation of lens focus and resolution in a time-saving and efficient manner, and the evaluation process is simple to operate and low in cost.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In one aspect of the utility model, a lens focus and resolution evaluation device is provided, comprising a camera, the camera comprising a body and a lens to be evaluated mounted on the body; a mounting plate is arranged at intervals on one side of the camera, the lens to be evaluated is arranged toward the mounting plate, and the camera can move relative to the mounting plate to approach or move away from the mounting plate; a resolution block module is arranged on the plate surface of the mounting plate, the resolution block module comprises a plurality of stripe resolution units with successively decreasing lengths, the distance between the lens to be evaluated and the mounting plate is moved, the clarity of each stripe resolution unit in the image captured by the resolution block module in the central field of view and the edge field of view by the lens to be evaluated is read, and the lens to be evaluated is focused according to the clarity of the stripe resolution unit in the central field of view.

[0008] Optionally, the resolution block module includes a backlight source panel and a resolution panel, wherein the resolution panel is fixed on a panel surface of the backlight source panel, and a side of the backlight source panel facing away from the resolution panel is arranged on a mounting plate.

[0009] Optionally, the resolution panels include multiple ones, and the multiple resolution panels are evenly distributed on the same backlight panel, wherein one resolution panel is set at a position corresponding to the orthographic projection of the lens to be evaluated on the backlight panel, and the remaining resolution panels are evenly distributed around the periphery of the orthographic projection.

[0010] Optionally, the backlight source panels include multiple backlight source panels, which are evenly distributed on the mounting plate; the resolution panels include multiple resolution panels, and the number and positions of the resolution panels correspond one-to-one to the backlight source panels; one of the backlight source panels is set at a corresponding position of the orthographic projection of the lens to be evaluated on the mounting plate, and the remaining backlight source panels are evenly distributed around the periphery of the orthographic projection.

[0011] Optionally, a plurality of mounting holes are provided on the mounting plate, and the backlight source panel is clamped on the board surface of the mounting plate through the mounting holes.

[0012] Optionally, the lens focus and resolution evaluation device further comprises a slide rail, which is arranged on a side of the mounting plate facing the camera; the camera is slidably arranged on the slide rail.

[0013] Optionally, a fixing plate is provided on the side of the slide rail facing away from the camera, an end of the fixing plate is vertically connected to the mounting plate, and a reinforcing rib is provided at the connection between the fixing plate and the mounting plate.

[0014] Optionally, the lens focus and resolution evaluation device further comprises a bracket, a slide table is arranged on the side of the slide rail facing the bracket, and the bracket is arranged on the slide rail through the slide table; the camera is arranged on the side of the bracket away from the slide table.

[0015] Optionally, the bracket includes a base arranged on the slide and a support column vertically arranged on the base, a support seat is arranged at one end of the support column away from the base, and the camera is arranged on the support seat.

[0016] Optionally, the lens focus and resolution evaluation device further includes a controller, which is electrically connected to the slide table to control the slide table to move along the slide rail.

[0017] The beneficial effects of the utility model include:

[0018] The present application provides a lens focus and resolution evaluation device, comprising a camera, the camera comprising a body and a lens to be evaluated mounted on the body; a mounting plate is arranged at intervals on one side of the camera, the lens to be evaluated is arranged toward the mounting plate, and the camera can move relative to the mounting plate to approach or move away from the mounting plate; a resolution block module is arranged on the plate surface of the mounting plate, the resolution block module comprises a plurality of stripe resolution units with successively decreasing lengths, the distance between the lens to be evaluated and the mounting plate is moved, an image of the resolution block module in a central field of view and a peripheral field of view is captured by the lens to be evaluated, the clarity of each stripe resolution unit in the image is read, and the unit to be evaluated is focused according to the clarity of the stripe resolution unit in the central field of view. The device can control the lens to approach or move away from the mounting plate and read the clarity of each fringe resolution unit at a preset position, thereby evaluating the focus state of the lens through the clarity of the fringe resolution unit in the central field of view, and can adjust the focus of the lens to be evaluated according to the read clarity; at the same time, during the movement, the device can read the clearest fringe resolution unit at a preset position, so that the lens reads the resolution readings of the fringe resolution units corresponding to the central field of view and the edge field of view, so as to comprehensively evaluate the resolution of the lens, and complete the evaluation of the lens focus and resolution in a time-saving and efficient manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 One of the structural schematic diagrams of the lens focus and resolution evaluation device provided in an embodiment of the utility model;

[0021] Figure 2 A second structural schematic diagram of the lens focus and resolution evaluation device provided by an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the structure of a resolution panel provided in an embodiment of the utility model;

[0023] Figure 4 This is an enlarged view of the details at point A.

[0024] Icons: 100-lens focus and resolution evaluation device; 110-camera; 111-lens to be evaluated; 120-mounting plate; 121-resolution block module; 1211-backlight board; 1212-resolution board; 1213-fringe resolution unit; 122-mounting hole; 130-slide rail; 131-fixing plate; 132-reinforcement rib; 133-slide table; 140-bracket; 141-base; 142-support seat; 143-support column. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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 the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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 the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Please refer to Figure 1 The present embodiment provides a lens focus and resolution evaluation device 100, comprising a camera 110, the camera 110 comprising a body and a lens 111 to be evaluated mounted on the body; a mounting plate 120 is arranged at intervals on one side of the camera 110, the lens 111 to be evaluated is arranged toward the mounting plate 120, and the camera 110 can move relative to the mounting plate 120 to approach or move away from the mounting plate 120; a resolution block module 121 is arranged on the board surface of the mounting plate 120, the resolution block module 121 comprises a plurality of fringe resolution units 1213 of decreasing lengths in sequence, the distance between the lens 111 to be evaluated and the mounting plate 120 is moved, the image of the resolution block module 121 in the central field of view and the edge field of view is captured by the lens 111 to be evaluated, the clarity of each fringe resolution unit 1213 in the image is read, and the unit to be evaluated is focused according to the clarity of the fringe resolution unit 1213 in the central field of view.

[0032] Specifically, the present application provides a lens focus and resolution evaluation device 100, which includes a camera 110, the camera 110 includes a body and a lens to be evaluated 111 mounted on the body, preferably, the camera 110 is a CMOS camera 110, of course, it can also be a scanner camera 110; a mounting plate 120 is arranged opposite to the lens to be evaluated 111, and a resolution block module 121 is arranged on the surface of the mounting plate 120. Figure 3 As shown, the resolution block module 121 includes a plurality of stripe resolution units 1213 of decreasing lengths, each stripe resolution unit 1213 includes a plurality of black and white stripes of the same length and arranged at intervals, and each stripe resolution unit 1213 corresponds to a resolution reading; the lens 111 to be evaluated can move forward and backward relative to the mounting plate 120 to approach or move away from the mounting plate 120; the camera 110 can move to a preset position to maintain a preset distance from the resolution block module 121 of the mounting plate 120, and read the image of the resolution block module 121 captured by the lens 111 to be evaluated in the central field of view and the edge field of view on the resolution block module 121 at the preset position, read the clarity of each stripe resolution unit 1213 in the image, and the focus degree and resolution level of the lens can be evaluated through the clarity.

[0033] It should be noted that in the embodiments of the present application, first, the resolution block module 121 includes a backlight panel 1211 and a resolution panel 1212, the resolution panel 1212 is fixed on the surface of the backlight panel 1211, and the side of the backlight panel 1211 away from the resolution panel 1212 is arranged on the mounting plate 120.

[0034] Specifically, Figure 2 As shown, the resolution block module 121 includes a backlight panel 1211 and a resolution panel 1212. The backlight panel 1211 is attached to the surface of the mounting panel 120, and the resolution panel 1212 is fixed to the surface of the backlight panel 1211. The surface of the resolution panel 1212 includes a plurality of black and white stripes. The setting of the backlight panel 1211 enables the camera 110 and the lens 111 to be evaluated to read the stripes on the resolution panel 1212 more clearly, thereby improving the reliability and efficiency of the evaluation process.

[0035] Among them, the resolution plate 1212 is preferably a 1951 resolution plate 1212, which is an internationally standard marker for measuring the MTF of a lens, avoiding differences in evaluation results caused by the measured object; the backlight plate 1211 is preferably illuminated by a blue backlight. The use of a blue backlight can avoid differences in resolution recognition caused by different lighting methods, such as bright field lighting, dark field lighting, coaxial lighting, etc., and avoid differences in the effect of reading stripes of the lens 111 to be evaluated, thereby improving the reliability and efficiency of the evaluation process. In addition, the use of a blue backlight can match the measurement band of some precision instruments, such as a scanner. The scanner works under blue light working conditions, which can avoid interference of ambient light on resolution evaluation, thereby further improving the reliability and accuracy of the evaluation results.

[0036] Second, if Figure 2 As shown, the mounting plate 120 is provided with a plurality of mounting holes 122, and the backlight source board 1211 is clamped on the board surface of the mounting plate 120 through the mounting holes 122. This arrangement facilitates the installation of the backlight source board 1211, and the setting position of the backlight source board 1211 can be changed according to the height of the lens 111 to be evaluated, measurement requirements, etc., thereby improving the efficiency of the evaluation process.

[0037] The present application provides a lens focus and resolution evaluation device 100, comprising a camera 110, wherein the camera 110 comprises a body and a lens 111 to be evaluated mounted on the body; a mounting plate 120 is arranged at intervals on one side of the camera 110, the lens 111 to be evaluated is arranged toward the mounting plate 120, and the camera 110 can move relative to the mounting plate 120 to approach or move away from the mounting plate 120; a resolution block module 121 is arranged on the board surface of the mounting plate 120, and the resolution block module 121 comprises a plurality of fringe resolution units 1213 of decreasing lengths in sequence, the distance between the lens 111 to be evaluated and the mounting plate 120 is moved, and images of the resolution block module 121 in the central field of view and the edge field of view are captured by the lens 111 to be evaluated, the clarity of each fringe resolution unit 1213 in the image is read, and the unit to be evaluated is focused according to the clarity of the fringe resolution unit 1213 in the central field of view. The device can control the lens to approach or move away from the mounting plate 120 and read the clarity of each fringe resolution unit 1213 at a preset position, thereby evaluating the focus state of the lens through the clarity of the fringe resolution unit 1213 in the central field of view, and can adjust the focus of the lens 111 to be evaluated according to the read clarity; at the same time, during the movement, the device can read the clearest fringe resolution unit 1213 at a preset position, so that the lens reads the resolution readings of the fringe resolution units 1213 corresponding to the central field of view and the edge field of view, so as to comprehensively evaluate the resolution of the lens, and complete the evaluation of the lens focus and resolution in a time-saving and efficient manner.

[0038] In one possible implementation of the present application, the resolution panels 1212 include multiple resolution panels 1212, and the multiple resolution panels 1212 are evenly distributed on the same backlight panel 1211, wherein one resolution panel 1212 is set at a corresponding position of the orthographic projection of the lens 111 to be evaluated on the backlight panel 1211, and the remaining resolution panels 1212 are evenly distributed on the orthographic projection.

[0039] Specifically, the resolution board 1212 may include a plurality of resolution boards 1212, and the plurality of resolution boards 1212 are evenly distributed on the same backlight board 1211, wherein one resolution board 1212 is arranged at a position corresponding to the orthographic projection of the lens 111 to be evaluated on the backlight board 1211, that is, arranged directly opposite to the lens 111 to be evaluated, so that when the lens 111 to be evaluated reads the resolution module, the resolution reading and focus state of the fringe resolution unit 1213 corresponding to its central field of view can be read; the remaining resolution boards 1212 are arranged on the peripheral side of the orthographic projection of the lens 111 to be evaluated on the backlight board 1211, so that when the lens 111 to be evaluated reads the resolution module, the resolution reading of its edge field of view can be read, thereby more accurately evaluating its resolution level.

[0040] In another possible implementation of the present application, the backlight panels 1211 include multiple backlight panels 1211, and the multiple backlight panels 1211 are evenly distributed on the mounting plate 120; the resolution panels 1212 include multiple resolution panels 1212, and the number and positions of the resolution panels 1212 correspond one-to-one to the backlight panels 1211; one of the backlight panels 1211 is set at a corresponding position of the orthographic projection of the lens 111 to be evaluated on the mounting plate 120, and the remaining backlight panels 1211 are evenly distributed around the periphery of the orthographic projection.

[0041] Specifically, Figure 1 and Figure 2 As shown, both the backlight source panels 1211 and the resolution panels 1212 include a plurality of backlight source panels 1211, the backlight source panels 1211 are mounted on the mounting plate 120, and the resolution panels 1212 are arranged on the backlight source panels 1211, and the number of the resolution panels 1212 and the number of the backlight source panels 1211 correspond to one another; one of the backlight source panels 1211 is arranged at a corresponding position of the orthographic projection of the lens 111 to be evaluated on the mounting plate 120, that is, it is arranged directly opposite to the lens 111 to be evaluated, so that when the lens 111 to be evaluated reads the resolution module, the resolution reading and the focusing state of the central field of view can be read; the remaining backlight source panels 1211 are arranged on the peripheral side of the orthographic projection of the lens 111 to be evaluated on the mounting plate 120, so that when the lens 111 to be evaluated reads the resolution module, the resolution reading of the edge field of view can be read, thereby more accurately evaluating its resolution level.

[0042] For example, the lens focus and resolution evaluation device 100 further includes a slide rail 130 . The slide rail 130 is disposed on a side of the mounting plate 120 facing the camera 110 . The camera 110 is slidably disposed on the slide rail 130 .

[0043] Specifically, Figure 1 As shown, the lens focus and resolution evaluation device 100 further includes a slide rail 130, which is disposed on the side of the mounting plate 120 facing the camera 110. The camera 110 is slidably disposed on the slide rail 130, so that it can move relative to the mounting plate 120 along the slide rail 130 to approach or move away from the mounting plate 120, and read the stripe resolution unit 1213 with the clearest stripes on the resolution block module 121 at a preset interval, so as to evaluate the focus state and resolution level of the lens. By setting the slide rail 130, the movement of the camera 110 is more stable, and the reliability and stability of the evaluation process are improved.

[0044] Furthermore, a fixing plate 131 is provided on the side of the slide rail 130 facing away from the camera 110 , an end of the fixing plate 131 is vertically connected to the mounting plate 120 , and a reinforcing rib 132 is provided at the connection between the fixing plate 131 and the mounting plate 120 .

[0045] Specifically, Figure 1 and Figure 4As shown, a fixing plate 131 is provided on the side of the slide rail 130 away from the camera 110, and the fixing plate 131 can support and fix the slide rail 130; the end of the fixing plate 131 is vertically connected to the end of the mounting plate 120, and a reinforcing rib 132 is provided at the connection between the fixing plate 131 and the mounting plate 120. Preferably, the reinforcing rib 132 is a right-angled triangle structure to match the right angle formed by the end of the mounting plate 120 and the end of the fixing plate 131. By providing the reinforcing rib 132, the stability and reliability of the lens focus and resolution evaluation device 100 can be further improved, and the camera 110 can be prevented from tipping over due to unstable center of gravity during movement.

[0046] Furthermore, if Figure 4 As shown, the lens focus and resolution evaluation device 100 further includes a bracket 140, a slide 133 is provided on the side of the slide rail 130 facing the bracket 140, and the bracket 140 is arranged on the slide rail 130 through the slide 133; the camera 110 is arranged on the side of the bracket 140 away from the slide 133. Through the arrangement of the bracket 140, the arrangement of the camera 110 and the slide rail 130 is more stable, and the slide 133 can drive the bracket 140 and the camera 110 to move along the slide rail 130, further improving the stability and reliability of the lens focus and resolution evaluation device 100, and preventing the camera 110 from tipping over due to unstable center of gravity during the movement of the device.

[0047] Furthermore, if Figure 4 As shown, the bracket 140 includes a base 141 disposed on the slide 133 and a support column 143 vertically disposed on the base 141. A support seat 142 is disposed at one end of the support column 143 away from the base 141, and the camera 110 is disposed on the support seat 142. Preferably, the support column 143 may be a retractable structure, so as to adjust the relative height of the camera 110 and the mounting plate 120, so as to provide accuracy of the evaluation process; the arrangement of the support seat 142 and the base 141 can further improve the connection stability between the camera 110 and the bracket 140, and the stability of the connection between the bracket 140 and the slide rail 130 by increasing the contact area.

[0048] Preferably, the lens focus and resolution evaluation device 100 further includes a controller, which is electrically connected to the slide 133 to control the slide 133 to move along the slide rail 130 .

[0049] Specifically, the lens focus and resolution evaluation device 100 also includes a controller, which is electrically connected to the slide 133 to control the slide 133 to drive the camera 110 to move along the slide rail 130 to adjust the relative distance between the camera 110 and the mounting plate 120. This setting method can not only make the movement process of the camera 110 more stable and controllable, but also can more accurately set the camera 110 at a preset position, so as to improve the accuracy of the evaluation results.

[0050] Taking the 1951 resolution board 1212 as an example, the use principle of the lens focus and resolution evaluation device 100 provided in the present application is as follows:

[0051] When evaluating the focus state of the lens 111 to be evaluated:

[0052] First, the lens 111 to be evaluated is set at a first preset position, for example, at a distance resolution of 250 mm, and the focus ring of the lens 111 to be evaluated is adjusted to be initially clear. At this time, the resolution reading of the resolution plate 1212 is read as 0G2 stripe resolution unit 1213, and the MTF value (modulus transfer function) is calculated according to the maximum brightness and minimum brightness of the black and white stripes in the resolution reading of 0G2 stripe resolution unit 1213, and the lens focus ring is adjusted to near the maximum value according to the size of the MFT value; the optimal imaging area can be preliminarily determined by the MTF value, so as to adjust the focus of the lens 111 to be evaluated;

[0053] Afterwards, the lens 111 to be evaluated is set at a second preset position, for example, 150 mm away from the resolution front end. At this time, the clearest fringe resolution unit 1213 on the resolution plate 1212 is read to see whether the resolution reading can reach 1G5 fringe resolution unit 1213. If not, the focus ring of the lens 111 to be evaluated is finely adjusted until the resolution reading reaches 1G5 fringe resolution unit 1213.

[0054] Afterwards, the lens 111 to be evaluated is set at a third preset position, for example, 450 mm away from the resolution front end. At this time, the clearest fringe resolution unit 1213 on the resolution plate 1212 is read to see whether the resolution reading is 0G3 fringe resolution unit 1213. If not, the focus ring of the lens 111 to be evaluated is finely adjusted until the resolution reading is 0G3 fringe resolution unit 1213.

[0055] The above operation is repeated until the lens 111 to be evaluated is set at the second preset position, for example, when it is 150 mm away from the front end of the resolution, the clearest fringe resolution unit 1213 on the resolution plate 1212 can be read to achieve a resolution reading of 1G5 fringe resolution unit 1213; the lens 111 to be evaluated is set at the third preset position, for example, when it is 450 mm away from the front end of the resolution, at this time, the clearest fringe resolution unit 1213 on the resolution plate 1212 can be read to achieve a resolution reading of 0G3 fringe resolution unit 1213, at this time, the focusing is completed and the best focusing position is reached; in the process of repeatedly moving the lens 111 to be evaluated and reading the clarity of the fringe resolution unit 1213, the focusing state of the evaluation lens at this time can be evaluated.

[0056] When evaluating the resolution level of the lens 111 to be evaluated:

[0057] First, the lens 111 to be evaluated is set at a first preset position, for example, at a distance resolution of 250 mm, and the focus ring of the lens 111 to be evaluated is adjusted to be initially clear. At this time, the resolution reading of the resolution plate 1212 is read as 0G2 stripe resolution unit 1213, and the MTF value (modulus transfer function) is calculated according to the maximum brightness and minimum brightness of the black and white stripes in the resolution reading of 0G2 stripe resolution unit 1213, and the lens focus ring is adjusted to near the maximum value according to the size of the MFT value; the optimal imaging area can be preliminarily determined by the MTF value, so as to adjust the focus of the lens 111 to be evaluated;

[0058] Afterwards, the lens 111 to be evaluated is set at a second preset position, for example, 150 mm away from the resolution front end. At this time, the clearest and largest fringe resolution units 1213 on the resolution board 1212 of the central field of view and the edge field of view of the lens 111 to be evaluated are read;

[0059] Afterwards, the lens 111 to be evaluated is set at a third preset position, for example, 250 mm away from the resolution front end. At this time, the clearest and largest fringe resolution units 1213 on the resolution board 1212 of the central field of view and the edge field of view of the lens 111 to be evaluated are read;

[0060] Afterwards, the lens 111 to be evaluated is set at a fourth preset position, for example, 600 mm away from the resolution front end. At this time, the clearest and largest fringe resolution units 1213 on the resolution plate 1212 of the central field of view and the edge field of view of the lens 111 to be evaluated are read;

[0061] According to the above three preset positions, preferably, each preset position is provided with 5 resolution panels 1212 , and the resolution level of the lens 111 to be evaluated is comprehensively evaluated according to the resolution readings of the fringe resolution units 1213 read by the 15 groups of resolution panels 1212 .

[0062] The above description is only an optional embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0063] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. A lens focus and resolution evaluation device, characterized in that: The invention comprises a camera, wherein the camera comprises a body and a lens to be evaluated mounted on the body; a mounting plate is arranged at intervals on one side of the camera, the lens to be evaluated is arranged toward the mounting plate, and the camera can move relative to the mounting plate to approach or move away from the mounting plate; a resolution block module is arranged on the plate surface of the mounting plate, the resolution block module comprises a plurality of fringe resolution units with decreasing lengths in sequence, the distance between the lens to be evaluated and the mounting plate is moved, the clarity of each fringe resolution unit in the image captured by the lens to be evaluated through the resolution block module in the central field of view and the edge field of view, and the lens to be evaluated is focused according to the clarity of the fringe resolution unit in the central field of view.

2. The lens focus and resolution evaluation device according to claim 1, characterized in that: The resolution block module comprises a backlight source panel and a resolution panel. The resolution panel is fixed on the panel surface of the backlight source panel. The side of the backlight source panel facing away from the resolution panel is arranged on the mounting plate.

3. The lens focus and resolution evaluation device according to claim 2, characterized in that: The resolution panels include multiple ones, and the multiple resolution panels are evenly distributed on the same backlight panel, wherein one resolution panel is set at a position corresponding to the orthographic projection of the lens to be evaluated on the backlight panel, and the other resolution panels are evenly distributed around the periphery of the orthographic projection.

4. The lens focus and resolution evaluation device according to claim 2, characterized in that: The backlight source panels include multiple ones, and the multiple backlight source panels are evenly distributed on the mounting plate; the resolution panels include multiple ones, and the number and positions of the resolution panels correspond one-to-one to the backlight source panels; one of the backlight source panels is arranged at a corresponding position of the orthographic projection of the lens to be evaluated on the mounting plate, and the remaining backlight source panels are evenly distributed around the periphery of the orthographic projection.

5. The lens focus and resolution evaluation device according to claim 2, characterized in that: The mounting plate is provided with a plurality of mounting holes, and the backlight source plate is clamped on the plate surface of the mounting plate through the mounting holes.

6. The lens focus and resolution evaluation device according to claim 1, characterized in that: The lens focus and resolution evaluation device also includes a slide rail, which is arranged on a side of the mounting plate facing the camera; the camera is slidably arranged on the slide rail.

7. The lens focus and resolution evaluation device according to claim 6, characterized in that: A fixing plate is provided on the side of the slide rail facing away from the camera, the end of the fixing plate is vertically connected to the mounting plate, and a reinforcing rib is provided at the connection between the fixing plate and the mounting plate.

8. The lens focus and resolution evaluation device according to claim 6, characterized in that: The lens focus and resolution evaluation device also includes a bracket, a slide table is arranged on the side of the slide rail facing the bracket, and the bracket is arranged on the slide rail through the slide table; the camera is arranged on the side of the bracket away from the slide table.

9. The lens focus and resolution evaluation device according to claim 8, characterized in that: The bracket comprises a base arranged on the slide and a support column vertically arranged on the base, a support seat is arranged at one end of the support column away from the base, and the camera is arranged on the support seat.

10. The lens focus and resolution evaluation device according to claim 8, characterized in that: The lens focus and resolution evaluation device also includes a controller, which is electrically connected to the slide table to control the slide table to move along the slide rail.

Images