Micro optical lens surface defect detection device

Abstract

The utility model discloses a miniature optical lens surface defect detection device, which is used for acquiring an image of a detection sample and comprises a camera and an optical microscopic device, the optical microscopic device is provided with an intermediate light path, an objective lens and an objective table, the camera, the intermediate light path and the objective lens are sequentially arranged from top to bottom along the same optical axis, and the miniature optical lens surface defect detection device further comprises a dome light source, a light shield of the dome light source is arranged on the objective table to enable light to irradiate a detection sample from different angles, the light shield is provided with a light inlet hole, the end of an objective lens extends into the light inlet hole to receive light reflected by the detection sample, the light is integrated into parallel light through an intermediate light path and returns to the camera, and the camera obtains an image of the detection sample. The micro optical lens surface defect detection device replaces a manual visual method to detect the surface defects of the micro optical lens, the objectivity of a detection result is higher, high precision and high efficiency are also considered, and the micro optical lens surface defect detection device can meet the requirement of high-quality industrial production of the micro optical lens.

Description

Technical Field

[0001] The utility model relates to the technical field of optical detection, in particular to a micro optical lens surface defect detection device. Background Art

[0002] Optical lenses will inevitably produce some surface defects during the processing process. These defects usually include pitting, scratches, etc. The existence of these defects will affect the quality of the optical system, and then affect the quality of the product. In severe cases, it will cause the system to crash. The existing optical lens detection method is mainly manual visual method, which is easily affected by manual fatigue and professionalism, has poor objectivity, low detection accuracy and efficiency, and is not conducive to large-scale industrial production. The devices on the market for detecting surface defects of optical lenses are mainly used to detect surface defects of large-sized optical lenses, and the detection accuracy is difficult to achieve the accuracy of surface defect detection of micro optical lenses. Therefore, it is difficult for the existing optical lens detection methods to take into account both high precision and high efficiency, and cannot be applied to the needs of high-quality industrial production of micro optical lenses. Utility Model Content

[0003] The utility model aims at solving the technical problems existing in the prior art and provides a device for detecting surface defects of a micro optical lens.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a micro-optical lens surface defect detection device, used for collecting images of detection samples, including a camera and an optical microscope, wherein the optical microscope is provided with an intermediate optical path, an objective lens and an objective stage; the camera, the intermediate optical path and the objective lens are arranged in sequence from top to bottom along the same optical axis, and also include a dome light source, a light shield of the dome light source is arranged on the objective stage so that light is irradiated on the detection sample from different angles, the light shield is provided with a light inlet hole, the end of the objective lens extends into the light inlet hole to receive light reflected by the detection sample, and is integrated into parallel light through the intermediate optical path and returned to the camera, and the camera obtains the image of the detection sample.

[0005] Furthermore, the intermediate optical path includes a beam splitter prism, a collimating lens, a polarization beam splitter prism and a wave plate arranged in sequence from top to bottom along the same optical axis; the light reflected by the detection sample is filtered by the wave plate and then enters the polarization beam splitter prism for polarization, and then is collimated by the collimating lens. The collimated light is split by the beam splitter prism and converges on the camera.

[0006] Furthermore, a plurality of circumferentially distributed lamp beads are provided at the bottom of the inner wall of the light shield to emit light upwards, the light shield is hemispherical to reflect the light and illuminate the test sample from different angles, and the light inlet hole is provided at the top of the light shield.

[0007] Furthermore, the optical microscope device is also provided with a bracket, to which the camera, the intermediate optical path, the objective lens and the stage are sequentially connected.

[0008] Furthermore, the optical microscope device is also provided with a moving platform, and the moving platform is connected to drive the stage to move relative to the bracket.

[0009] Furthermore, a tablet pressing clamp is arranged on the loading platform, and the tablet pressing clamp is connected to the central area of ​​the upper surface of the loading platform.

[0010] Furthermore, it also includes a computer, which is connected to the camera and can control the exposure time of the camera to present the image taken by the camera.

[0011] Furthermore, the test sample is placed above the glass slide and located at the bottom of the light shield, and the glass slide is mounted on the stage through the pressing clamp.

[0012] Furthermore, the detection sample is a micro optical lens.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model includes a camera and an optical microscope. The optical microscope is provided with an intermediate optical path, an objective lens and a stage. The camera, the intermediate optical path and the objective lens are arranged in sequence from top to bottom along the same optical axis. It also includes a dome light source. The light shield of the dome light source is arranged on the stage so that light can be irradiated on the test sample from different angles. The light shield is provided with a light inlet. The end of the objective lens extends into the light inlet to receive the light reflected by the test sample, and integrates it into parallel light through the intermediate optical path and returns to the camera. The camera obtains an image of the test sample. The utility model replaces the traditional manual visual method for detecting surface defects of micro-optical lenses. The objectivity of the detection result is stronger, and it also takes into account high precision and high efficiency. It can be applied to the needs of high-quality industrial production of micro-optical lenses. In addition, the objective lens is an ordinary lens with different magnifications. With the independently designed intermediate optical path, the production cost can be greatly reduced, which is convenient for mass production.

[0015] 2. The intermediate optical path in the utility model includes a beam splitter prism, a collimating lens, a polarizing beam splitter prism and a 1 / 4 wave plate. The light reflected by the detection sample is filtered by the wave plate and then enters the polarizing beam splitter prism for polarization, and then is collimated by the collimating lens. The collimated light is split by the beam splitter prism and converges on the camera, respectively realizing the collection, filtering, collimation and spectroscopic imaging of light, so that high-quality surface defect images can be presented.

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the present invention is not limited to the embodiment as a device for detecting surface defects of a micro optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side view of the utility model;

[0018] Figure 2 It is the front view of the utility model;

[0019] Figure 3 It is a three-dimensional schematic diagram of the utility model;

[0020] Figure 4 It is a schematic diagram of the positional relationship between the detection sample and the glass slide of the utility model;

[0021] Figure 5 It is a three-dimensional schematic diagram of the dome light source of the utility model;

[0022] Figure 6 This is a schematic diagram of the decomposition of the optical path intermediate of the utility model;

[0023] Figure 7 It is a schematic diagram of the optical path of the utility model for detecting samples with surface defects;

[0024] Figure 8 This is a schematic diagram of the optical path of the utility model for detecting a sample without surface defects;

[0025] In the figure:

[0026] 1. Camera; 2. First threaded hole; 3. Intermediate light path; 4. Second threaded hole; 5. Objective lens; 6. Dome light source;

[0027] 7. Test sample; 8. Glass slide; 9. Stage; 10. Bracket; 11. Knob; 12. Light inlet; 13. Lamp beads;

[0028] 14. Power cord; 15. Beam splitter prism; 16. Collimating lens; 17. Polarization beam splitter prism; 18. Wave plate; 19. Plate clamp. DETAILED DESCRIPTION

[0029] In the present invention, the directions or positional relationships indicated by "upper", "lower", "inner", "outer", "top / bottom" and the like in the description are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] See also Figure 1-Figure 8 As shown, a micro optical lens surface defect detection device of the utility model is used to collect images of the detection sample 7, including a camera 1, an optical microscope and a dome light source 6. The optical microscope is provided with an intermediate optical path 3, an objective lens 5, a stage 9 and a bracket 10. The camera 1, the intermediate optical path 3, the objective lens 5 and the stage 9 are connected to the bracket 10. The camera 1, the intermediate optical path 3 and the objective lens 5 are arranged in sequence from top to bottom along the same optical axis. The light shield of the dome light source 6 is arranged on the stage 9 so that light is irradiated on the detection sample 7 from different angles. The light shield is provided with a light inlet 12. The end of the objective lens 5 extends into the light inlet 12 to receive the light reflected by the detection sample 7, and integrates it into parallel light through the intermediate optical path 3 and returns to the camera 1. The camera 1 obtains the image of the detection sample 7. The utility model also includes a computer, which is connected to the camera 1 and can control the exposure time of the camera 1 to present the image taken by the camera 1. In this embodiment, the objective lens 5 selected is an ordinary lens with different magnifications, but is not limited to this. The use of common lenses in combination with the independently designed intermediate optical path 3 can greatly reduce production costs and facilitate mass production.

[0031] See also Figure 1 and Figure 2 As shown, the optical microscope device is also provided with a moving platform, and the moving platform is connected to drive the stage 9 to move relative to the bracket 10. In this embodiment, the moving platform is a three-dimensional moving platform, which can drive the stage 9 to move in three directions of XYZ, and is provided with one or more knobs 11 for controlling the moving direction; a film pressing clamp 19 is provided on the stage 9, and the film pressing clamp 19 is connected to the central area of ​​the upper surface of the stage 9, and the film pressing clamp 19 is used to clamp the slide 8.

[0032] See also Figure 2 , Figure 3 and Figure 4 As shown, the test sample is placed above the slide 8 and at the bottom of the light shield of the dome light source 6, and the slide 8 is mounted on the central area of ​​the stage 9 through the slide clamp 19. In this embodiment, the test sample 7 is a micro optical lens.

[0033] See also Figure 5 As shown, the bottom of the inner wall of the light shield of the dome light source 6 is provided with a plurality of circumferentially distributed LED lamp beads 13 to emit light upwards, the light shield is hemispherical so that the light is reflected and irradiated on the test sample 7 from different angles, and the top of the light shield is provided with a light inlet hole 12. The light intensity of the LED lamp beads 13 can be adjusted through the power cord 14.

[0034] See also Figure 6As shown, the intermediate optical path 3 includes a beam splitter prism 15, a collimating lens 16, a polarization beam splitter prism 17 and a wave plate 18, which are arranged in sequence from top to bottom along the same optical axis. The wave plate 18 can be a 1 / 4 wave plate 18, but is not limited to this. The light reflected by the detection sample 7 is filtered by the 1 / 4 wave plate 18 and then enters the polarization beam splitter prism 17 for polarization, and then collimated by the collimating lens 16. The collimated light is split by the beam splitter prism 15 and converges on the camera 1. Specifically, when detecting surface defects, the reflected light first passes through the objective lens 5, and then these lights pass through the 1 / 4 wave plate 18, the purpose of which is to remove the influence of other stray reflected light, so that we can pay more attention to the characteristics of the target reflected light. Afterwards, the light passes through the polarization beam splitter prism 17 (PBS), which uses the polarization characteristics to only allow the light beam with a vibration direction parallel to the surface to pass, thereby further filtering out unnecessary polarization components. The light treated by PBS then passes through the collimating lens 16, which converts the originally scattered light into a parallel beam, ensuring that the light has better directionality and consistency in the subsequent processing. Finally, these parallel lights pass through the common beam splitter prism 15 (BS), which splits the light according to the wavelength or other properties of the light, and finally converges the light of a specific band or characteristic in the camera 1 for shooting and analyzing images of surface defects. Throughout the process, various optical components work together, from light collection, filtering, collimation to the final spectroscopic imaging, all of which provide strong technical support for achieving high-quality surface defect detection.

[0035] Working principle: The dome light source 6 is placed horizontally on the upper surface of the stage 9. The lamp beads 13 at the bottom of the dome light source 6 emit light at different angles to illuminate the test sample 7 (micro-optical lens). The position where there is no defect on the surface of the test sample 7 (micro-optical lens) will not change the refraction angle of the light, so that the light will not enter the objective lens 5. Figure 7 The position of the surface defect will change the refraction direction of the light, so that the light enters the objective lens 5, as shown in FIG. Figure 8 As shown, the light reflected by the surface defects of the detection sample (micro-optical lens) is integrated into parallel light through the intermediate optical path 3 and returned to the camera 1. The image of the surface defects of the detection sample 7 (micro-optical lens) is presented in the computer through the camera 1, and then the collected image is processed and analyzed by the computer.

[0036] During assembly, the test sample 7 (micro optical lens) is horizontally placed on the upper surface of the slide 8 at the bottom of the dome light source 6, and the stage 9, the intermediate optical path 3, and the objective lens 5 are all fixed on the bracket 10. Specifically, the camera 1 is fixed to the upper end of the intermediate optical path 3 by engaging the inner thread of the first threaded hole 2 at the top of the intermediate optical path 3 through the thread at the bottom of the camera 1; the objective lens 5 is fixed to the lower end of the intermediate optical path 3 by engaging the inner thread of the second threaded hole 4 at the bottom of the intermediate optical path 3 through the thread at the top of the camera 1; the intermediate optical path 3 is fixed to the bracket 10 by bolts, the stage 9 is clamped in the bracket 10 through the card slot, the objective lens 5 extends into the light source from the light inlet 12 at the top of the dome light source 6, the dome light source 6 is horizontally placed on the upper surface of the stage 9, the test sample 7 (micro optical lens) is horizontally placed on the upper surface of the slide 8 at the bottom of the dome light source 6, and the slide 8 is fixed to the stage 9 by the pressing clip 19 in the central area of ​​the upper surface of the stage 9.

[0037] When used, the detection process is as follows:

[0038] Step 1: first turn the knob 11 on the side of the stage 9 to adjust the position of the stage 9 so that the stage 9 is at the lowest position and the center area faces the objective lens 5;

[0039] Step 2: Using tweezers, the test sample 7 (micro optical lens) is clamped to the center area of ​​the upper surface of the glass slide 8 which is horizontally placed on the center area of ​​the upper surface of the stage 9;

[0040] Step 3: Place the dome light source 6 from top to bottom in the center of the stage 9 and cover the slide 8, so that the test sample 7 (micro optical lens) faces the light inlet 12 of the dome light source 6, connect the power cord 14 of the dome light source 6 to the power source, turn on the camera 1 and the dome light source 6, and make preparations before testing;

[0041] Step 4: By observing the picture taken by the camera 1 in the computer, by turning the knob 11 on the side of the stage 9, first adjust the horizontal movement of the stage 9 in the XY direction, and place the test sample 7 (micro optical lens) at the center of the field of view that can be captured by the camera 1;

[0042] Step 5: Adjust the vertical movement of the stage 9 in the Z direction by turning the knob 11 on the side of the stage 9. The adjustment method is to first perform coarse focus adjustment, quickly turn the knob 11, and roughly see the morphology of the test sample 7 (micro-optical lens) on the computer; then fine-adjust the focus, slowly turn the knob 11 until the focal plane of the camera 1 is aligned with the upper surface of the test sample 7 (micro-optical lens), so that the camera 1 captures the clearest image of the test sample 7 (micro-optical lens), and then stop turning the knob 11;

[0043] Step 6: Adjust the illumination intensity of the dome light source 6. The illumination intensity of the dome light source 6 is related to the number of lamp beads 13 at the bottom and the illumination intensity of a single lamp bead 13. The more lamp beads 13 there are, the stronger the illumination intensity of a single lamp bead 13 is, and the stronger the maximum illumination intensity of the dome light source 6 is. Control the exposure time of the camera 1 on the computer, and select the illumination intensity and exposure time suitable for the detection sample 7 (micro-optical lens) according to the clarity of the surface defect image of the detection sample 7 (micro-optical lens). The position where the surface of the detection sample 7 (micro-optical lens) has defects has light entering the camera 1 through the intermediate optical path 3, while the position where the surface of the detection sample 7 (micro-optical lens) has no defects has no light entering the camera 1 through the intermediate optical path 3, thereby presenting a surface defect image with bright defects and dark background in the camera 1. Such an image is easier to process and analyze the surface defects of the detection sample 7 (micro-optical lens).

[0044] The utility model replaces the traditional manual visual method to detect surface defects of micro-optical lenses. The objectivity of the detection results is stronger, and it also takes into account high precision and high efficiency, and can be applied to the needs of high-quality industrial production of micro-optical lenses. In addition, the objective lens 5 is an ordinary lens with different magnifications, and is matched with the independently designed intermediate optical path 3, which can greatly reduce the production cost and facilitate mass production. The intermediate optical path 3 in the utility model includes a beam splitter prism 15, a collimating lens 16, a polarization beam splitter prism 17 and a 1 / 4 wave plate 18. The light reflected by the detection sample 7 is filtered by the wave plate 18 and then enters the polarization beam splitter prism 17 for polarization, and then collimated by the collimating lens 16. The collimated light is split by the beam splitter prism 15 and converges on the camera 1, respectively realizing the collection, filtering, collimation and spectroscopic imaging of light, so that high-quality surface defect images can be presented.

[0045] The utility model provides a micro optical lens surface defect detection device, and the unrelated parts are the same as the prior art or can be implemented by using the prior art.

[0046] The above embodiments are only used to further illustrate a micro optical lens surface defect detection device of the utility model, but the utility model is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model fall within the protection scope of the technical solution of the utility model.

Claims

1. A micro optical lens surface defect detection device, used for collecting images of detection samples, comprising a camera and an optical microscope, wherein the optical microscope is provided with an intermediate optical path, an objective lens and a stage; characterized in that: The camera, the intermediate optical path and the objective lens are arranged in sequence from top to bottom along the same optical axis, and also include a dome light source. The light shield of the dome light source is arranged on the stage to allow light to irradiate the detection sample from different angles. The light shield is provided with a light inlet hole. The end of the objective lens extends into the light inlet hole to receive the light reflected by the detection sample, and integrates it into parallel light through the intermediate optical path and returns to the camera, and the camera obtains an image of the detection sample.

2. The detection device according to claim 1, characterized in that: The intermediate optical path includes a beam splitter prism, a collimating lens, a polarization beam splitter prism and a wave plate arranged in sequence from top to bottom along the same optical axis; the light reflected by the detection sample is filtered by the wave plate and then enters the polarization beam splitter prism for polarization, and then is collimated by the collimating lens. The collimated light is split by the beam splitter prism and converges on the camera.

3. The detection device according to claim 1, characterized in that: A plurality of circumferentially distributed lamp beads are disposed at the bottom of the inner wall of the light shield to emit light upwards. The light shield is hemispherical so as to reflect the light and illuminate the test sample from different angles. The light inlet hole is disposed at the top of the light shield.

4. The detection device according to claim 1, characterized in that: The optical microscope device is also provided with a bracket, to which the camera, the intermediate optical path, the objective lens and the stage are sequentially connected.

5. The detection device according to claim 4, characterized in that: The optical microscope device is also provided with a moving platform, and the moving platform is connected to drive the stage to move relative to the bracket.

6. The detection device according to claim 1, characterized in that: The stage is provided with a tablet pressing clamp, and the tablet pressing clamp is connected to the central area of ​​the upper surface of the stage.

7. The detection device according to claim 1, characterized in that: The device also includes a computer, which is connected to the camera and can control the exposure time of the camera to present the image taken by the camera.

8. The detection device according to claim 6, characterized in that: The test sample is placed above the glass slide and at the bottom of the light shield, and the glass slide is mounted on the stage through the pressing clip.

9. The detection device according to claim 1 or 8, characterized in that: The detection sample is a micro optical lens.

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