Optical lens transfer function test target generator

Abstract

This application relates to the field of optical testing and provides a target generator for testing the transfer function of an optical lens, including a target wheel, a target base, and a target. The target wheel has a target base mounting position; the target base has a locating pin insertion hole, an arc-shaped waist-shaped hole, and an adjusting screw mounting hole; the target has a locating pin through hole; a locating pin is installed in the locating pin insertion hole, one end of which is interference-fitted with the locating pin insertion hole, and the other end is located in the locating pin through hole and clearance-fitted with the locating pin through hole; the target is magnetically connected to the target base; the target base mounting position has a threaded hole, and the target base is installed in the target base mounting position by a screw, one end of which passes through the arc-shaped waist-shaped hole and is screwed into the threaded hole; an adjusting screw is screwed into the adjusting screw mounting hole, the abutting end of the adjusting screw abuts against the target wheel, and the screw-tightening end of the adjusting screw is located on one side of the target base, and the attitude of the target relative to the target wheel can be adjusted by turning the adjusting screw. This device can achieve rapid adjustment of the target attitude while ensuring accuracy, improving the efficiency of target assembly and disassembly.

Description

Technical Field

[0001] This application relates to the field of optical testing technology, and in particular to a target generator for testing the transfer function of an optical lens. Background Technology

[0002] Optical lenses are core components of various imaging systems, and their performance directly determines the image quality of the system. Currently, the modulation transfer function (MTF) is a crucial technical indicator for evaluating the imaging performance of optical lenses. The MTF, the modulus of the optical transfer function, directly affects the cost of developing an optical system and the quality of its imaging. It comprehensively reflects various factors affecting image quality, such as diffraction, aberrations, and stray light, objectively assessing the image quality of the optical system. It is an internationally recognized core evaluation indicator for the imaging performance of optical systems in practical testing. Currently, mainstream optical lens transfer function testing equipment in China mainly consists of a collimation system, a target generator, and an image analyzer. All components utilize foreign equipment, resulting in high costs, long development cycles, difficult maintenance, and the constant risk of embargoes. The target generator is a critical component of the transfer function testing equipment, used to generate uniform star apertures and slit targets with the required spectral matching for measurement.

[0003] Currently, target generators consist of a target wheel and a target. The target is used to output small holes or slits that meet testing requirements. The target wheel rotates under the drive of a drive assembly, and the target is mostly fixed to the target wheel with screws. However, due to variations in screw preload during target installation, the target may deviate from its theoretical position, requiring repeated adjustments, which is cumbersome and severely impacts the efficiency of target installation and replacement. Furthermore, target adjustment is difficult and requires skilled operators, making it challenging for them to master. This can also lead to significant deviations between the target and its theoretical position, failing to meet testing accuracy requirements. Utility Model Content

[0004] To address the aforementioned problems, this application provides a target generator for testing the transfer function of an optical lens. This generator is ingeniously designed and has a simple structure. Using this device, the target attitude can be quickly adjusted, improving the efficiency of target installation and replacement. The technical solution adopted in this application is as follows:

[0005] An optical lens transfer function testing target generator includes a target wheel, a target base, and a target. The target has a slit. The target wheel has a plurality of target base mounting positions, which are evenly distributed along the circumference of the target wheel. The target base is circular, and a hole adapted to the target is provided at the center of the target base. The target base also has a positioning pin insertion hole, an arc-shaped waist-shaped hole, and an adjusting screw mounting hole. Each target base has two positioning pin insertion holes, two arc-shaped waist-shaped holes, and two adjusting screw mounting holes of the same type, which are respectively provided on opposite sides of the hole.

[0006] Each target is provided with two positioning pin holes, and the two positioning pin holes correspond to two positioning pin insertion holes on the same target base. A positioning pin is provided in the positioning pin insertion hole. One end of the positioning pin is interference-fitted with the positioning pin insertion hole, and the other end of the positioning pin is located in the positioning pin hole and is clearance-fitted with the positioning pin hole. The target is magnetically connected to the target base.

[0007] Each target mounting position has two threaded holes, which correspond to two arc-shaped holes on the same target. The target is mounted on the target mounting position by two screws, one end of which passes through the arc-shaped hole and is screwed into the threaded hole. An adjusting screw is screwed into the adjusting screw mounting hole. The adjusting screw includes an abutting end and a screwing end. The abutting end abuts against the target wheel, and the screwing end is located on the side of the target base away from the target wheel. By screwing the adjusting screw, the attitude of the target relative to the target wheel can be adjusted.

[0008] By replacing the traditional target generator where the target is directly connected to the target wheel with a new one that includes the target, target holder, and target wheel, the target provides the slit required for testing, while the target holder adjusts the target's attitude relative to the target wheel. Once the target holder is adjusted to meet the accuracy requirements of the deviation between the target and the theoretical position, testing can begin. If the target needs to be replaced later, only the target needs to be disassembled and installed; no operation on the target holder is required because its attitude was already adjusted during the initial target installation. This ensures the accuracy of the target position and improves the efficiency of target installation and replacement.

[0009] After assembling the target, target base, and target wheel, the angle between the plane of the slit on the target and the plane of the target wheel can be adjusted simply by turning the adjusting screw. This allows for adjustment of the slit's attitude relative to the target wheel, ensuring the two planes are as parallel as possible. The adjustment operation is simple and efficient, requiring minimal operator skill. This target generator enables rapid adjustment of the target's attitude, facilitating high-precision target adjustment and yielding high-accuracy results.

[0010] The clearance fit between the locating pin and the locating pin socket on the target ensures that the target's attitude relative to the target base remains essentially unchanged by controlling the size and precision of the clearance. In other words, the error introduced by the target mounting on the target base is small, meeting the accuracy requirements. This also makes it possible to adjust the target's attitude simply by adjusting the attitude of the target base relative to the target wheel. The target and target base are connected by magnetic attraction. This connection method is a soft (magnetic) connection, which facilitates the installation and removal of the target and does not introduce error factors, ensuring the accuracy of the target mounting on the target base.

[0011] In some embodiments, the target base is further provided with magnetic suction component mounting holes, and each target base has two magnetic suction component mounting holes, with the two magnetic suction component mounting holes respectively located on opposite sides of the hole; a magnetic suction component is installed in the magnetic suction component mounting hole, and the entire magnetic suction component is located inside the magnetic suction component mounting hole.

[0012] By installing the entire magnetic suction component inside the magnetic suction component mounting hole, direct contact between the magnetic suction component and the target is avoided, so as not to affect the accuracy of the target installation on the target base.

[0013] In some embodiments, the target mounting position is a cylindrical countersunk hole with an annular platform inside, the threaded hole being located on the annular platform, and the abutting end of the adjusting screw abutting against the annular platform.

[0014] By setting a cylindrical countersunk hole, the overall thickness of the target, target base, and target wheel after assembly can be reduced, saving space and reducing the overall weight.

[0015] In some embodiments, the target holder includes a body portion and a flange portion. The body portion is cylindrical, and the flange portion is disposed around the outer periphery of the body portion and located at one end of the body portion along its axial direction. The body portion of the target holder is adapted to the small diameter section of the cylindrical countersunk hole, and the flange portion of the target holder is adapted to the large diameter section of the cylindrical countersunk hole. The arc-shaped waist-shaped hole and the adjusting screw mounting hole are both located on the flange portion, and the magnetic suction mounting hole and the positioning pin insertion hole are both located on the body portion.

[0016] By setting the target holder in a T-shape, meaning the target holder includes a body and a flange, the body provides sufficient thickness for mounting the magnetic component. In other words, the presence of the body allows for the mounting of thicker magnetic components. Compared to thinner magnetic components, thicker magnetic components provide greater magnetic force, ensuring that the target will not accidentally fall off the target holder.

[0017] In some embodiments, the screw-on end of the adjusting screw is higher than the target wheel and the target.

[0018] By positioning the screw-in end of the adjusting screw above the target wheel and target, the target wheel and target will not affect the screw-in, making it easy to tighten the adjusting screw manually or with tools.

[0019] In some embodiments, the two adjusting screw mounting holes on the same target are located on the target at positions corresponding to the two ends of the slit.

[0020] By placing the mounting holes for the adjusting screws on the target base at positions corresponding to both ends of the slit, that is, by placing the axes of the slit and the mounting holes for the adjusting screws in the same plane, the efficiency of adjusting the target base's attitude can be improved compared to schemes where the axes of the slit and the mounting holes for the adjusting screws are not in the same plane, thereby enabling rapid adjustment of the target's attitude.

[0021] In some embodiments, the target generator further includes a drive assembly for driving the target wheel to rotate.

[0022] In some embodiments, the drive assembly includes a direct-drive rotary motor.

[0023] By adopting a direct-drive rotary motor, connecting mechanisms such as reducers, gearboxes, pulleys, and ball screw pairs are eliminated, reducing positioning errors caused by mechanical structures, thus ensuring process accuracy. On the other hand, it also greatly reduces noise during use.

[0024] In some embodiments, the target generator further includes a photogate and a light-blocking plate adapted to the photogate, the light-blocking plate being mounted on the target wheel, and the photogate being mounted on the support frame of the direct-drive rotary motor.

[0025] By employing photoelectric gates and light-blocking plates, a reference point is provided for the initial position calibration of the direct-drive rotary motor, thus eliminating accumulated errors and improving the overall testing accuracy of the optical lens transfer function testing instrument. Furthermore, the direct-drive rotary motor is equipped with a high-precision grating ruler; the combination of the grating ruler and the photoelectric gate provides a dual guarantee for eliminating accumulated errors and improving testing accuracy.

[0026] The target generator for testing the optical lens transfer function provided in this application has at least one of the following beneficial effects:

[0027] 1. This application provides a target generator for testing the transfer function of an optical lens. It replaces the traditional target generator where the target is directly connected to the target wheel with a new target generator comprising a target, a target holder, and a target wheel. The target provides the slit required for testing, while the target holder adjusts the target's attitude relative to the target wheel. Once the deviation between the target and its theoretical position meets the accuracy requirements by adjusting the target holder, testing can proceed. If the target needs to be replaced subsequently, only the target needs to be disassembled and installed; no operation on the target holder is required because its attitude was already adjusted during the initial target installation. This ensures the accuracy of the target position and improves the efficiency of target installation and replacement.

[0028] After assembling the target, target base, and target wheel, the angle between the plane of the slit on the target and the plane of the target wheel can be adjusted simply by turning the adjusting screw. This allows for adjustment of the slit's attitude relative to the target wheel, ensuring the two planes are as parallel as possible. The adjustment operation is simple and efficient, requiring minimal operator skill. This target generator enables rapid adjustment of the target's attitude, facilitating high-precision target adjustment and yielding high-accuracy results.

[0029] The clearance fit between the locating pin and the locating pin socket on the target ensures that the target's attitude relative to the target base remains essentially unchanged by controlling the size and precision of the clearance. In other words, the error introduced by the target mounting on the target base is small, meeting the accuracy requirements. This also makes it possible to adjust the target's attitude simply by adjusting the attitude of the target base relative to the target wheel. The target and target base are connected by magnetic attraction. This connection method is a soft (magnetic) connection, which facilitates the installation and removal of the target and does not introduce error factors, ensuring the accuracy of the target mounting on the target base.

[0030] 2. The target generator for testing the transfer function of an optical lens provided in this application avoids direct contact between the magnetic suction component and the target by installing the entire magnetic suction component inside the magnetic suction component mounting hole, so as not to affect the accuracy of the target mounting on the target base.

[0031] 3. The target generator for testing the optical lens transfer function provided in this application can reduce the overall thickness of the target, target base and target wheel after assembly by setting a cylindrical countersunk hole, thereby saving space and reducing the overall weight.

[0032] 4. The target generator for testing the optical lens transfer function provided in this application sets the target holder in a T-shape, meaning the target holder includes a body and a flange. The body provides sufficient thickness for mounting the magnetic component, allowing for the mounting of a thicker magnetic component. Compared to a thinner magnetic component, the thicker magnetic component provides greater magnetic force, ensuring the target will not accidentally fall off the target holder.

[0033] 5. The target generator for testing the optical lens transfer function provided in this application makes the screwing end of the adjusting screw higher than the target wheel and the target, so that the target wheel and the target will not affect the screwing, making it easy to screw the adjusting screw manually or with tools.

[0034] 6. The target generator for testing the optical lens transfer function provided in this application improves the efficiency of target attitude adjustment by setting the adjustment screw mounting hole on the target base at the position corresponding to both ends of the slit, that is, the axis of the slit and the adjustment screw mounting hole are in the same plane. Compared with the scheme where the axis of the slit and the adjustment screw mounting hole are not in the same plane, this can achieve rapid adjustment of the target attitude.

[0035] 7. The target generator for testing the transfer function of an optical lens provided in this application eliminates connecting mechanisms such as reducers, gearboxes, pulleys, and ball screw pairs by adopting a direct-drive rotary motor, thereby reducing positioning errors caused by mechanical structures, ensuring process accuracy, and also significantly reducing noise during use.

[0036] 8. The target generator for testing the optical lens transfer function provided in this application, by employing a photoelectric gate and a light-blocking plate, provides a reference point for the initial position calibration of the direct-drive rotary motor. This eliminates accumulated errors and improves the overall detection accuracy of the optical lens transfer function testing instrument. Furthermore, the direct-drive rotary motor is equipped with a high-precision grating ruler; the combination of the grating ruler and the photoelectric gate provides a dual guarantee for eliminating accumulated errors and improving testing accuracy. Attached Figure Description

[0037] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a target generator for testing the optical lens transfer function:

[0038] Figure 1 This is a schematic diagram of the target generator of this application;

[0039] Figure 2 yes Figure 1 An enlarged view of part A in the embodiment;

[0040] Figure 3 yes Figure 2 Schematic diagram of the structure after the target is hidden in the embodiment;

[0041] Figure 4 yes Figure 3 Schematic diagram of the structure after concealing the magnetic chuck in the embodiment;

[0042] Figure 5 yes Figure 4 Schematic diagram of the structure after the target base is hidden in the embodiment;

[0043] Figure 6 This is a schematic diagram of the structure after the target mount and target are assembled (positioning pins and screws are not shown);

[0044] Figure 7 yes Figure 6 Another perspective on the embodiments;

[0045] Figure 8 This is a schematic diagram of the target's structure;

[0046] Figure 9 It is an exploded view of the target and the target base;

[0047] Figure 10 This is a schematic diagram of the target wheel.

[0048] Explanation of icon numbers:

[0049] Target wheel 1, cylindrical countersunk hole 11, threaded hole 12, annular platform 111, target base 2, hole 21, positioning pin insertion hole 22, arc-shaped waist hole 23, adjusting screw mounting hole 24, magnetic component mounting hole 25, body 26, flange 27, target 3, slit 31, positioning pin through hole 32, adjusting screw 4, abutting end 41, screwing end 42, magnetic component 5, direct drive rotary motor 6, photoelectric gate 7, light blocking plate 8, support frame 9. Detailed Implementation

[0050] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0051] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0052] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0053] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0055] refer to Figures 1-10This application provides a target generator for testing the transfer function of an optical lens, including a target wheel 1, a target base 2, and a target 3. The target 3 is provided with a slit 31. The target wheel 1 is provided with a plurality of target base mounting positions, which are evenly distributed along the circumference of the target wheel 1. The target base 2 is circular, and a hole 21 adapted to the target 3 is provided at the center of the target base 2. The target base 2 is also provided with a positioning pin insertion hole 22, an arc-shaped waist-shaped hole 23, and an adjusting screw mounting hole 24. Each target base 2 has two positioning pin insertion holes 22, two arc-shaped waist-shaped holes 23, and two adjusting screw mounting holes 24, and the two holes of the same type are respectively provided on opposite sides of the hole 21.

[0056] Each target 3 is provided with two positioning pin holes 32, which correspond to two positioning pin insertion holes 22 on the same target base 2. The positioning pin insertion hole 22 is provided with a positioning pin (not shown in the figure). One end of the positioning pin is interference-fitted with the positioning pin insertion hole 22, and the other end of the positioning pin is located in the positioning pin hole 32 and is clearance-fitted with the positioning pin hole 32. The target 3 is magnetically connected to the target base 2.

[0057] Each target mounting position is provided with two threaded holes 12, which correspond to two arc-shaped waist-shaped holes 23 on the same target 2. The target 2 is installed in the target mounting position by two screws (not shown in the figure). One end of the screw passes through the arc-shaped waist-shaped hole 23 and is screwed into the threaded hole 12. An adjusting screw 4 is screwed into the adjusting screw mounting hole 24. The adjusting screw 4 includes an abutting end 41 and a screwing end 42. The abutting end 41 abuts against the target wheel 1, and the screwing end 42 is located on the side of the target 2 away from the target wheel 1. The attitude of the target 3 relative to the target wheel 1 can be adjusted by screwing the adjusting screw 4.

[0058] It is important to note that by replacing the traditional target generator where the target 3 is directly connected to the target wheel 1 with a target generator comprising the target 3, target holder 2, and target wheel 1, the target 3 provides the slit 31 required for testing, while the target holder 2 adjusts the attitude of the target 3 relative to the target wheel 1. Once the deviation between the target 3 and its theoretical position meets the accuracy requirements by adjusting the target holder 2, testing can proceed. If the target 3 needs to be replaced subsequently, only the target 3 needs to be disassembled and installed; no operation on the target holder 2 is required, as its attitude was already adjusted during the initial installation of the target 3. This ensures the accuracy of the target 3's position and improves the efficiency of target 3 installation and replacement.

[0059] Understandably, after the target 3, target base 2, and target wheel 1 are assembled, the angle between the plane containing the slit 31 on the target 3 and the plane containing the target wheel 1 can be adjusted simply by turning the adjusting screw 4. This allows for adjustment of the attitude of the slit 31 relative to the target wheel 1, making the two planes as parallel as possible. The adjustment operation is simple and efficient, requiring minimal operator skill. Using this target generator, the attitude of the target 3 can be quickly adjusted, easily achieving high-precision adjustment of the target 3 and obtaining high-precision results.

[0060] Understandably, the clearance fit between the locating pin (not shown in the figure) and the locating pin insertion hole 22 on the target 3 ensures that the attitude of the target 3 relative to the target base 2 remains essentially unchanged by controlling the size and precision of the clearance between them. In other words, the error caused by the installation of the target 3 on the target base 2 is small, meeting the accuracy requirements. This also makes it possible to adjust the attitude of the target 3 simply by adjusting the attitude of the target base 2 relative to the target wheel 1. The target 3 and the target base 2 are connected by magnetic attraction. This connection method is a soft (magnetic) connection, which facilitates the installation and removal of the target 3 and does not introduce error factors, ensuring the accuracy of the target 3 installed on the target base 2.

[0061] refer to Figure 3 , Figure 4 , Figure 8 , Figure 9 In one embodiment, the target base 2 is also provided with magnetic suction mounting holes 25. Each target base 2 has two magnetic suction mounting holes 25, and the two magnetic suction mounting holes 25 are respectively located on opposite sides of the hole 21. A magnetic suction element 5 is installed in the magnetic suction mounting hole 25, and the magnetic suction element 5 is located entirely within the magnetic suction mounting hole 25.

[0062] It is understandable that by installing the magnetic suction component 5 entirely within the magnetic suction component mounting hole 25, direct contact between the magnetic suction component 5 and the target 3 is avoided, so as not to affect the accuracy of the target 3 being installed on the target base 2.

[0063] refer to Figure 5 , Figure 10 In one embodiment, the target holder 2 is mounted in a cylindrical countersunk hole 11, and an annular platform 111 is provided inside the cylindrical countersunk hole 11. A threaded hole 12 is provided on the annular platform 111, and the abutting end 41 of the adjusting screw 4 abuts against the annular platform 111.

[0064] It is worth noting that by setting a cylindrical countersunk hole 11, the overall thickness of the target 3, target base 2, and target wheel 1 after assembly can be reduced, saving space and reducing the overall weight.

[0065] refer to Figure 7 , Figure 8In one embodiment, the target holder 2 includes a body portion 26 and a flange portion 27. The body portion 26 is cylindrical, and the flange portion 27 is disposed around the outer periphery of the body portion 26 and located at one end of the body portion 26 in the axial direction. The body portion 26 of the target holder 2 is adapted to the small diameter section of the cylindrical countersunk hole 11, and the flange portion 27 of the target holder 2 is adapted to the large diameter section of the cylindrical countersunk hole 11. The arc-shaped waist-shaped hole 23 and the adjusting screw mounting hole 24 are both provided on the flange portion 27, and the magnetic suction mounting hole 25 and the positioning pin insertion hole 22 are both provided on the body portion 26.

[0066] It is understandable that by setting the target holder 2 in a T-shape, that is, by including a body portion 26 and a flange portion 27, the body portion 26 provides sufficient thickness for the installation of the magnetic chuck 5. In other words, the presence of the body portion 26 allows for the installation of a thicker magnetic chuck 5. Compared to a thinner magnetic chuck 5, the thicker magnetic chuck 5 can provide a greater magnetic attraction force, ensuring that the target 3 will not accidentally fall off the target holder 2.

[0067] refer to Figures 1-4 , Figures 6-8 In one embodiment, the screw-in end 42 of the adjusting screw 4 is higher than the target wheel 1 and the target 3. By making the screw-in end 42 of the adjusting screw 4 higher than the target wheel 1 and the target 3, the target wheel 1 and the target 3 will not affect the screw-in of the adjusting screw 4, making it easy to screw in the adjusting screw 4 manually or with tools.

[0068] refer to Figure 2 , Figure 6 In one embodiment, two adjusting screw mounting holes 24 on the same target 2 are located on the target 2 at positions corresponding to the two ends of the slit 31.

[0069] It is understandable that by setting the adjusting screw mounting hole 24 on the target base 2 at the positions corresponding to both ends of the slit 31, that is, the axis of the slit 31 and the adjusting screw mounting hole 24 are in the same plane, this can improve the adjustment efficiency of the target base 2's attitude compared to the scheme where the axis of the slit 31 and the adjusting screw mounting hole 24 are not in the same plane, thereby achieving rapid adjustment of the target 3's attitude.

[0070] In one embodiment, the target generator further includes a drive component for driving the target wheel 1 to rotate.

[0071] refer to Figure 1 In one specific embodiment, the drive assembly includes a direct-drive rotary motor 6. By using a direct-drive rotary motor 6, connecting mechanisms such as reducers, gearboxes, pulleys, and ball screw pairs are eliminated, reducing positioning errors caused by mechanical structures, ensuring process accuracy, and also significantly reducing noise during use.

[0072] refer to Figures 1-5 In one embodiment, the target generator further includes a photoelectric gate 7 and a light-blocking plate 8 adapted to the photoelectric gate 7. The light-blocking plate 8 is mounted on the target wheel 1, and the photoelectric gate 7 is mounted on the support frame 9 of the direct-drive rotary motor 6.

[0073] It is worth noting that by employing photoelectric gate 7 and light-blocking plate 8, a reference point is provided for the initial position calibration of direct-drive rotary motor 6, thus eliminating accumulated errors and improving the overall detection accuracy of the optical lens transfer function testing instrument. Furthermore, the direct-drive rotary motor 6 is equipped with a high-precision grating ruler; the combination of the grating ruler and photoelectric gate 7 provides a dual guarantee for eliminating accumulated errors and improving testing accuracy.

[0074] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A target generator for testing the transfer function of an optical lens, characterized in that, The device includes a target wheel, a target base, and a target, the target having a slit; the target wheel has several target base mounting positions, which are evenly distributed along the circumference of the target wheel; the target base is circular, and a hole adapted to the target is provided at the center of the target base; the target base also has a positioning pin insertion hole, an arc-shaped waist-shaped hole, and an adjusting screw mounting hole; each target base has two positioning pin insertion holes, two arc-shaped waist-shaped holes, and two adjusting screw mounting holes of the same type, and the two holes are respectively located on opposite sides of the hole; Each target is provided with two positioning pin holes, and the two positioning pin holes correspond to two positioning pin insertion holes on the same target base. A positioning pin is provided in the positioning pin insertion hole. One end of the positioning pin is interference-fitted with the positioning pin insertion hole, and the other end of the positioning pin is located in the positioning pin hole and is clearance-fitted with the positioning pin hole. The target is magnetically connected to the target base. Each target mounting position has two threaded holes, which correspond to two arc-shaped holes on the same target. The target is mounted on the target mounting position by two screws, one end of which passes through the arc-shaped hole and is screwed into the threaded hole. An adjusting screw is screwed into the adjusting screw mounting hole. The adjusting screw includes an abutting end and a screwing end. The abutting end abuts against the target wheel, and the screwing end is located on the side of the target base away from the target wheel. By screwing the adjusting screw, the attitude of the target relative to the target wheel can be adjusted.

2. The target generator for testing the transfer function of an optical lens according to claim 1, characterized in that, The target base is also provided with magnetic suction component mounting holes. Each target base has two magnetic suction component mounting holes, and the two magnetic suction component mounting holes are respectively located on opposite sides of the hole. A magnetic suction component is installed in the magnetic suction component mounting hole, and the entire magnetic suction component is located inside the magnetic suction component mounting hole.

3. The target generator for testing the transfer function of an optical lens according to claim 2, characterized in that, The target mounting position is a cylindrical countersunk hole, and an annular platform is provided inside the cylindrical countersunk hole. The threaded hole is located on the annular platform, and the abutting end of the adjusting screw abuts against the annular platform.

4. A target generator for testing the transfer function of an optical lens according to claim 3, characterized in that, The target holder includes a body and a flange. The body is cylindrical, and the flange surrounds the outer periphery of the body and is located at one end of the body in the axial direction. The body of the target holder is adapted to the small diameter section of the cylindrical countersunk hole, and the flange of the target holder is adapted to the large diameter section of the cylindrical countersunk hole. The arc-shaped waist hole and the adjusting screw mounting hole are both located on the flange, and the magnetic suction mounting hole and the positioning pin insertion hole are both located on the body.

5. A target generator for testing the transfer function of an optical lens according to any one of claims 1-4, characterized in that, The screwing end of the adjusting screw is higher than the target wheel and the target.

6. A target generator for testing the transfer function of an optical lens according to claim 5, characterized in that, The two adjusting screw mounting holes on the same target base are located on the target base at positions corresponding to the two ends of the slit.

7. A target generator for testing the transfer function of an optical lens according to claim 6, characterized in that, It also includes a drive assembly for driving the target wheel to rotate.

8. A target generator for testing the transfer function of an optical lens according to claim 7, characterized in that, The drive assembly includes a direct-drive rotary motor.

9. A target generator for testing the transfer function of an optical lens according to claim 8, characterized in that, It also includes a photoelectric gate and a light-blocking plate adapted to the photoelectric gate. The light-blocking plate is installed on the target wheel, and the photoelectric gate is installed on the support frame of the direct-drive rotary motor.

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