Optical system
By combining the use of ring light sources and parallel light sources in an optical measurement system, using the design of a zoom lens and a movable light source mount, the measurement accuracy problem caused by the non-parallel light sources in the prior art is solved, and clear imaging of complex workpieces is achieved and high-precision measurements.
Patent Information
- Application Number
- CN202420629753.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-28
AI Technical Summary
In the existing optical measurement technology, the light emitted by the circular surface light source as the backlight source is not parallel, resulting in a characteristic transition of a thickness of more than 0.5mm is not obvious, affecting the measurement accuracy, and it is difficult to image weak boundaries such as arcs under the above-mentioned light source, and is clean. The surface is difficult to image due to reflection.
An optical system is designed, including a machine, a zoom lens assembly, an upper light source assembly and a lower light source assembly. The combination of annular light source and a parallel light source is used to realize multi-angle angles to the workpiece through a zoom lens and a movable upper light source mount. Irradiation, combined with stepper motor drive, precise control of the light source position to ensure clear imaging.
It realizes clear imaging of various workpieces, improves measurement accuracy, especially for the imaging effects of small through holes and thick workpieces, and can accurately capture arc-like transition edges, enhancing measurement accuracy.
Smart Images
Figure CN222145326U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical measurement, in particular to an optical system. Background Art
[0002] In the field of optical measurement, the most advanced optical illumination technology currently used generally uses a fixed-height five-ring, eight-segment ring light as the upper light source, and a circular surface light source as the backlight. This arrangement has significant drawbacks when used for precision measurement. First, because the circular surface light source used as the backlight does not emit parallel light, the transition of features thicker than 0.5mm is not clear, thus affecting measurement accuracy. In addition, weak boundaries such as arcs are difficult to image under the illumination of this light source, and smooth surfaces are difficult to image due to reflections. Utility Model Content
[0003] The main purpose of the utility model is to provide an optical system, which aims to provide an optical system that can clearly illuminate workpieces and make various workpieces have clear imaging effects.
[0004] To achieve the above-mentioned purpose, the optical system proposed in the present invention is used for imaging a workpiece in a precision measurement system, and includes:
[0005] The machine platform comprises a frame and a table, wherein the table is used to carry a workpiece;
[0006] A zoom lens assembly, comprising a lens mount and a zoom lens, wherein the lens mount is fixedly mounted on the frame to carry and fix the zoom lens, and a point light source is mounted on the zoom lens;
[0007] An upper light source assembly, comprising an upper light source mounting seat, the upper light source mounting seat being movably mounted on the frame and having a movable travel in an up-and-down direction, the upper light source mounting seat being provided with an annular light source, the annular light source being coaxially arranged with the zoom lens; and
[0008] The lower light source assembly comprises a lower light source mounting seat, which is movably mounted on the table. A parallel light source is arranged on the lower light source mounting seat, and the parallel light source and the annular light source are arranged opposite to each other.
[0009] Optionally, a driving component is further included, which is installed on the frame and connected to the upper light source mounting seat to drive the upper light source mounting seat to move in the up and down directions.
[0010] Optionally, the driving assembly includes a stepping motor and a driving rod, the stepping motor is fixedly mounted on the frame, and the driving rod is connected to the upper light source mounting seat to drive the upper light source mounting seat to move in the up and down directions.
[0011] Optionally, the upper light source mounting seat includes:
[0012] A connecting base is movably disposed on the frame, and the connecting base is connected to the driving rod; and
[0013] The annular lamp holder is arranged in an annular shape and is fixedly connected to the connecting base for mounting the annular light source.
[0014] Optionally, a guide rail seat is provided at one end where the connecting base is connected to the rack, a guide rail is provided at the portion where the rack and the connecting base are connected, and the connecting base is movably connected to the rack via the guide rail.
[0015] Optionally, the lower light source mounting base includes:
[0016] A movable base for slidingly connecting with the table top, wherein one end of the movable base connected with the table top is provided with a slide rail base for slidingly setting on the table top; and
[0017] The supporting lamp frame is fixedly connected to the movable base and is provided with an annular bracket for supporting the parallel light source.
[0018] Optionally, the annular light source is configured as a five-ring eight-zone annular light source.
[0019] Optionally, the parallel light source is configured as a telecentric coaxial light source.
[0020] Optionally, a light shield is further included, which is arranged around the upper light source assembly and is fixedly connected to the upper light source frame.
[0021] Optionally, a circuit board assembly is further included, wherein the circuit board assembly is electrically connected to the annular light source, the point light source and the parallel light source to control the intensity of the annular light source, the point light source and the parallel light source.
[0022] In the technical solution of the present utility model, the optical system is used to image each workpiece in a precision measurement system, and includes a machine platform, a zoom lens assembly, an upper light source assembly, and a lower light source assembly. In which, the machine includes a table and a frame, the frame is used to support and install the zoom lens assembly and the upper light source assembly, the table is used to carry the lower light source assembly and the workpiece, the zoom lens assembly includes a lens mount and a zoom lens, the lens mount is installed on the frame, and a point light source is installed on the zoom lens. The point light source can be used to illuminate reflective parts such as steel sheets to prevent reflections from affecting the detection effect. The upper light source assembly includes an upper light source mounting seat and an annular light source. The upper light source mounting seat can drive the annular light source to move along the up and down directions coaxial with the zoom lens, changing the height and angle of the light on the workpiece, so as to facilitate the clear capture of arc-like transition edges that are difficult to measure. The lower light source assembly includes a lower light source mounting seat and a parallel light source. Since the parallel light source is arranged below the workpiece and is backlit, it can make small through holes and thick workpieces clearly imaged. In this application, since the measurement accuracy requirements of some workpieces are very high, and the workpieces are small and complex in structure, and many dimensions need to be measured, the use of the above three light sources in conjunction with the zoom lens can better capture various features and thus perform accurate measurements. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the upper light source assembly in the optical system provided by the present utility model;
[0025] Figure 2 for Figure 1 Schematic diagram of the partial three-dimensional structure of the upper light source assembly in the optical system;
[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the lower light source assembly in the optical system of the utility model.
[0027] Description of Figure Numbers:
[0028] Label name Label name 1000 Optical system 32 Ring light 1 Machine 4 Lower light source assembly 11 frame 41 Lower light source mounting bracket 2 Zoom lens assembly 411 Mobile base 21 lens mount 412 Support lamp stand 22 zoom lens 42 directional light source 23 Point Light 5 Drive components 3 Upper light source assembly 51 stepper motor 31 Upper light source mounting seat 52 Drive rod 311 Connecting base 6 lens hood 312 Ring light stand
[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.
[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0032] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.
[0033] In the field of optical measurement, the most advanced optical technology currently used generally uses a fixed-height five-ring, eight-segment ring light as the upper light source, and a circular surface light source as the backlight. This arrangement has significant drawbacks when used for precision measurement. First, because the circular surface light source used as the backlight does not emit parallel light, the transition of features thicker than 0.5mm is not clear, thus affecting measurement accuracy. In addition, weak boundaries such as arcs are difficult to image under the illumination of this light source, and smooth surfaces are difficult to image due to reflections.
[0034] In order to solve the above problems, the utility model proposes an optical system, which aims to provide an optical system that can clearly illuminate the workpiece and make the imaging effect of various workpieces clear. Figures 1 to 3 The present invention is a schematic structural diagram of an optical system according to an embodiment of the present invention.
[0035] Please refer to Figures 1 to 3The present invention provides an optical system 1000, comprising a machine platform 1, a zoom lens assembly 2, an upper light source assembly 3, and a lower light source assembly 4. The machine platform 1 comprises a frame 11 and a tabletop, the tabletop being used to support a workpiece. The zoom lens assembly 2 comprises a lens mount 21 and a zoom lens 22. The lens mount 21 is fixedly mounted on the frame 11 to support and secure the zoom lens 22. A point light source 23 is mounted on the zoom lens 22. The upper light source assembly 3 comprises an upper light source mounting seat 31, which is movably mounted on the frame 11 and has a vertical movable travel. An annular light source 32 is disposed on the upper light source mounting seat 31, and the annular light source 32 is coaxially arranged with the zoom lens 22. The lower light source assembly 4 comprises a lower light source mounting seat 41, which is movably mounted on the tabletop. A parallel light source 42 is disposed on the lower light source mounting seat 41, and the parallel light source 42 and the annular light source 32 are disposed opposite each other.
[0036] It can be understood that in the technical solution of the present utility model, the optical system 1000 is used to image each workpiece in a precision measurement system, and includes a machine table 1, a zoom lens assembly 2, an upper light source assembly 3, and a lower light source assembly 4. The machine table 1 includes a table and a frame 11. The frame 11 is used to support and install the zoom lens assembly 2 and the upper light source assembly 3. The table is used to carry the lower light source assembly 4 and the workpiece. The zoom lens assembly 2 includes a lens holder 21 and a zoom lens 22. The lens holder 21 is installed on the frame 11. A point light source 23 is installed on the zoom lens 22. The point light source 23 can be used to illuminate reflective parts such as steel sheets to prevent reflections from affecting the detection effect. The upper light source assembly 3 includes an upper light source mounting seat 31 and a ring light source 32. The upper light source mounting seat 31 can drive the ring light The light source 32 moves in the up and down directions coaxial with the zoom lens 22 to change the height and angle of the illumination on the workpiece, so as to facilitate the clear capture of arc-like transition edges that are difficult to measure. The lower light source assembly 4 includes a lower light source mounting seat 41 and a parallel light source 42. Since the parallel light source 42 is arranged below the workpiece and is backlit, it can make small through holes and thick workpieces clearly imaged. In this application, since the measurement accuracy requirements of some workpieces are very high, and the workpieces are small and complex in structure, and many sizes need to be measured, the use of the above three light sources in conjunction with the zoom lens 22 can better capture various features and thus perform accurate measurements.
[0037] Furthermore, the optical system 1000 also includes a driving component 5, which is installed on the frame 11 and connected to the upper light source mounting seat 31, for driving the upper light source mounting seat 31 to move in the up and down directions, and then driving the upper light source mounting seat 31 to drive the annular light source 32 in the up and down directions to approach or move away from the workpiece. In this application, the distance range between the annular light source 32 and the workpiece is 10 to 50 mm. Within the corresponding distance range, the incident angle of the annular light source 32 irradiating the workpiece is 35° to 75°.
[0038] Specifically, the driving assembly 5 includes a stepper motor 51 and a driving rod 52. The stepper motor 51 is fixedly mounted on the frame 11, and the driving rod 52 is connected to the upper light source mounting seat 31 to drive the upper light source mounting seat 31 to move in the up and down directions. It is understandable that in some other embodiments, the driving assembly 5 can also be driven by a cylinder, a linear motor, a hydraulic drive, etc., which are not limited here. In the present application, the advantage of using a stepper motor 51 for driving is that the stepper motor 51 has a high precision, so it can more accurately drive the upper light source mounting seat 31 to move, and will not accumulate the error of one step to the next step. Therefore, its drive has good position accuracy and motion repeatability. In addition, since it is necessary to ensure the stability of the light, the stepper motor 51 has excellent start-stop and reversal response, so it can better maintain the position of the upper light source mounting seat 31 and its up and down movement position.
[0039] Please refer to Figure 2 The upper light source mounting base 31 includes a connecting base 311 and an annular light frame 312. The connecting base 311 is movably mounted on the frame 11 and connected to the drive rod 52. The annular light frame 312 is annular and fixedly connected to the connecting base 311 for mounting the annular light source 32. In this embodiment, the connecting base 311 is driven by the drive rod 52 to move the annular light frame 312 in the vertical direction, toward or away from the workpiece, thereby moving the annular light source 32 toward or away from the workpiece, providing illumination at different angles and facilitating the zoom lens 22 to capture difficult-to-discern arc transition edges.
[0040] Furthermore, a guide rail seat is provided at one end where the connecting base 311 and the frame 11 are connected, a guide rail is provided at the portion where the frame 11 and the connecting base 311 are connected, and the connecting base 311 is movably connected to the frame 11 via the guide rail. In some other embodiments, other movable connection methods are also included, such as belt transmission and the like. In this embodiment, a guide rail seat is provided on the connecting base 311, and a guide rail is provided on the frame 11. The guide rail seat and the guide rail cooperate, so that the driving rod 52 can drive the connecting base 311 to move along the guide rail, making the movement of the connecting base 311 more stable, making the position drive of the connecting base 311 more precise, avoiding position offset, and the cooperation between the guide rail and the guide rail seat does not require the addition of other components, and is simple to install.
[0041] Please refer to Figure 3 The lower light source mounting base 41 includes a movable base 411 and a support lamp holder 412. The movable base 411 is used to be slidably connected to the table top. One end of the movable base 411 connected to the table top is provided with a slide rail seat for sliding on the table top. The support lamp holder 412 is fixedly connected to the movable base 411 and is provided with a ring bracket for supporting the parallel light source 42. It can be understood that in this embodiment, the movable base 411 is slidably set on the table through a slide rail, so that it can drive the support lamp holder 412 to move back and forth along the extension direction of the slide rail, and then adjust the annular bracket to drive the movement of the parallel light source 42, and can adjust the position of the parallel light source 42 and the workpiece, and can be used to illuminate some small through holes on the workpiece. In addition, in this application, since the parallel light source 42 is set in an elongated shape, the support lamp holder 412 is provided with two annular brackets, and the two annular brackets are connected by four vertical rods, which can support the parallel light source 42 from above and below to achieve a better supporting effect.
[0042] In addition, in order to better realize edge detection, the annular light source 32 is set as a five-ring eight-zone ring light source. Since the LED array in the five-ring eight-zone annular light source 32 is conical and irradiates the surface of the workpiece at a certain angle, it can illuminate a small area by diffuse reflection. The light source can illuminate the edge of the workpiece and make the arc-like transition edges that are difficult to measure clearly illuminated, which is convenient for the imaging measurement of the zoom lens 22.
[0043] In order to make the backlight imaging effect clear, the parallel light source 42 is set as a telecentric coaxial light source. Furthermore, the telecentric coaxial light source is a parallel light source 42. Compared with the ordinary backlight source, the telecentric coaxial light source can eliminate the boundary blur caused by light source diffusion and other phenomena, and can improve the edge contour contrast of the workpiece during the detection process. In addition, the use of ordinary backlight sources will have backlight diffusion, and the light will be reflected on the side of the object, which often makes the object look smaller than the real object. However, the parallel light emitted by the telecentric coaxial light source used in this application can greatly reduce diffusion, so that a clear and sharp image can be obtained, thereby improving the measurement accuracy.
[0044] In addition, in order to avoid contamination of the light source, the optical system 1000 also includes a light shield 6, which is surrounded by the upper light source assembly 3. The light shield 6 is fixedly connected to the upper light source frame 11. In this embodiment, the light shield 6 is surrounded by the upper light source assembly 3 and can be used to block external light to avoid external light from disturbing the light irradiation of the upper light source assembly 3.
[0045] In some other embodiments, the optical system 1000 further includes a circuit board assembly, which is electrically connected to the annular light source 32, the point light source 23, and the parallel light source 42 to control the intensity of the annular light source 32, the point light source 23, and the parallel light source 42. The circuit board assembly can adjust the intensity of each light source to adapt to different scenarios, providing personalized measurement solutions for various types of workpieces. By adjusting the on / off and illumination intensity of each light source for different workpieces, clear imaging can be achieved, facilitating subsequent precise measurement or inspection.
[0046] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. An optical system for imaging a workpiece in a precision measurement system, characterized in that: include: The machine platform comprises a frame and a table, wherein the table is used to carry a workpiece; A zoom lens assembly, comprising a lens mount and a zoom lens, wherein the lens mount is fixedly mounted on the frame to carry and fix the zoom lens, and a point light source is mounted on the zoom lens; An upper light source assembly, comprising an upper light source mounting seat, the upper light source mounting seat is movably mounted on the frame and has a movable stroke in the up and down directions, an annular light source is arranged on the upper light source mounting seat, and the annular light source and the zoom lens are coaxially arranged; and, The lower light source assembly comprises a lower light source mounting seat, which is movably mounted on the table top. A parallel light source is arranged on the lower light source mounting seat, and the parallel light source and the annular light source are arranged opposite to each other.
2. The optical system according to claim 1, wherein: It also includes a driving component, which is installed on the frame and connected to the upper light source mounting seat to drive the upper light source mounting seat to move in the up and down directions.
3. The optical system according to claim 2, characterized in that The driving assembly comprises a stepping motor and a driving rod. The stepping motor is fixedly mounted on the frame. The driving rod is connected to the upper light source mounting seat to drive the upper light source mounting seat to move in the up and down directions.
4. The optical system according to claim 3, characterized in that The upper light source mounting seat comprises: A connecting base is movably disposed on the frame, and the connecting base is connected to the driving rod; and The annular lamp holder is arranged in an annular shape and is fixedly connected to the connecting base for mounting the annular light source.
5. The optical system according to claim 4, characterized in that A guide rail seat is arranged at one end where the connecting base is connected to the frame, a guide rail is arranged at the portion where the frame and the connecting base are connected, and the connecting base is movably connected to the frame via the guide rail.
6. The optical system according to claim 1, wherein: The lower light source mounting seat comprises: A movable base is used for being slidably connected with the table top, and a slide rail base is provided at one end of the movable base connected with the table top for being slidably arranged on the table top; and The supporting lamp frame is fixedly connected to the movable base and is provided with an annular bracket for supporting the parallel light source.
7. The optical system according to claim 1, wherein: The annular light source is configured as a five-ring eight-zone annular light source.
8. The optical system according to claim 1, wherein: The parallel light source is arranged as a telecentric coaxial light source.
9. The optical system according to claim 1, wherein: It also includes a light shield, which is arranged around the upper light source assembly and is fixedly connected to the frame.
10. The optical system according to claim 1, wherein: It also includes a circuit board assembly, which is electrically connected to the annular light source, the point light source and the parallel light source to control the intensity of the annular light source, the point light source and the parallel light source.