Lens fog defect detection device and method

Abstract

The application provides a lens fog defect detection device and method, and relates to the technical field of lens manufacturing. The lens fog defect detection device comprises a support, a rotating mechanism arranged on the support, a horizontal black projection plate fixed on the rotating mechanism, a light source module inclined to the outside of the projection plate connected to the edge of the projection plate, a lens clamping mechanism for clamping the lens horizontally arranged above the projection plate, and a shooting unit arranged above the lens clamping mechanism. The application can make the light emitted by the light source module be incident on the lens clamped by the lens clamping mechanism at a certain angle, and the lens image can be shot by the shooting unit above the projection plate, so that the defect image of the local area on the lens can be obtained. Then, the rotating mechanism is rotated by a predetermined angle, the defect image of other local areas on the lens is obtained, the lens fog defect is detected by comprehensively analyzing multiple lens images, and the accuracy and detection efficiency of the lens fog defect detection are improved.

Description

Technical Field

[0001] This invention relates to the field of lens manufacturing technology, and in particular to a device and method for detecting lens fogging defects. Background Technology

[0002] Lens fogging defects refer to a high-density micro-defect that appears on the surface of a lens after chemical polishing or chemical mechanical polishing, followed by thermal oxidation and chemical corrosion. Due to diffuse reflection of light, the dense micro-defect areas appear as macroscopic fogging, hence the name fogging defects or oxidation fogging defects.

[0003] Currently, lens defect detection still relies on manual visual inspection, which affects the efficiency of lens detection, and is costly and inaccurate. Summary of the Invention

[0004] The present invention aims to provide a device and method for detecting lens fogging defects, in order to at least partially solve at least one of the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, in a first aspect, the present invention provides a bracket, a rotating mechanism disposed on the bracket, a horizontal black projection plate fixed on the rotating mechanism, a light source module inclined outward from the edge of the projection plate, a lens clamping mechanism for horizontally clamping a lens mounted above the projection plate, and a shooting unit disposed above the lens clamping mechanism.

[0006] According to a preferred embodiment of the present invention, the projection panel is connected to the light source module via a light source angle adjustment seat;

[0007] The light source angle adjustment seat includes: at least two support seats located on the edge of the projection panel, the opposite ends of the two support seats are respectively provided with a first slot and a height-adjustable support member, and the edge of the light source module is provided with a first locking strip that matches the first slot;

[0008] Alternatively, the light source angle adjustment seat includes: a slot track located on the edge of the projection panel, wherein the slot track is provided with a plurality of second slots at different angles to the horizontal direction, and the edge of the light source module is provided with a second strip that matches the second slot.

[0009] According to a preferred embodiment of the present invention, the support base is formed by a horizontal end and a vertical end to form a side L-shape, the projection plate includes at least one straight side, two support bases are respectively fixed at both ends of the straight side, and the openings of the side L-shape are opposite to each other, the slot is provided in the horizontal end, and a support member is fixed on at least one side of the horizontal end located in the slot.

[0010] According to a preferred embodiment of the present invention, the bracket is a height-adjustable bracket, comprising: a first bracket and a second bracket. The first bracket is provided with a height-adjustable track in the vertical direction, and the height-adjustable track is provided with fixing holes at different heights. The bottom of the side wall of the second bracket is provided with a protruding column, and the top of the protruding column is provided with an embedded ring. The embedded ring is embedded in the track, and the protruding column can slide along the height-adjustable track to the fixing holes at different heights and be fixed by the embedded ring.

[0011] According to a preferred embodiment of the present invention, the angle between the light source module and the horizontal plane is adjustable in the range of 45° to 60°.

[0012] To solve the above-mentioned technical problems, a second aspect of the present invention provides a method for detecting lens fogging defects, comprising:

[0013] S1. Install the lens onto the lens clamping mechanism;

[0014] S2. Turn on the light source module and control the imaging unit to capture images;

[0015] S3. After controlling the rotating mechanism to rotate by a predetermined angle r, control the imaging unit to capture an image;

[0016] S4. Determine whether the rotating mechanism has rotated one full revolution;

[0017] S5. If the rotating mechanism completes one full rotation, determine whether the lens has a fogging defect based on all the captured images.

[0018] According to a preferred embodiment of the present invention, the predetermined angle r = 360 / n, where n is the number of images captured.

[0019] In summary, the lens haze defect detection device and method of the present invention, by fixing a horizontal black projection plate on a rotating mechanism, connecting a light source module inclined outward to the edge of the projection plate, and installing a lens clamping mechanism horizontally clamping the lens above the projection plate, allows light emitted from the light source module to be directed at a certain angle onto the lens clamped by the lens clamping mechanism. An image of the lens is captured by an imaging unit above the projection plate, thereby obtaining defect images of a local area on the lens. Then, the rotating mechanism is rotated by a predetermined angle to obtain multiple lens images captured under incident light at the same angle from different directions, thereby obtaining defect images of other local areas on the lens. Finally, the multiple lens images are combined to detect lens haze defects, improving the accuracy and efficiency of lens haze defect detection. Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] 1. By performing localized inspections of different areas of the lens and combining the images from each localized inspection, the results of determining whether the lens has fogging defects are more accurate than taking a single image of the entire lens.

[0021] 2. A projection plate is set on the rotating mechanism, and a light source module that is inclined outward is connected to the edge of the projection plate. A lens clamping mechanism that horizontally clamps the lens is installed above the projection plate. Each time a picture is taken, the rotating mechanism is rotated by a predetermined angle to ensure that the light emitted by the light source module is incident on the lens clamped by the lens clamping mechanism at the same incident angle. Thus, multiple lens images under the incident light at the same incident angle in different directions are obtained through the imaging unit, ensuring the accuracy of the detection.

[0022] 3. Using a black projection board makes the captured image a white image on a black background, making it easier to detect whether there are hazy defects on the white lens against the black background. Attached Figure Description

[0023] Figure 1 This is a perspective view of a lens fogging defect detection device provided in Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic flowchart of a lens fogging defect detection method provided in Embodiment 2 of the present invention;

[0025] Among them: 1-stand, 2-rotation mechanism, 3-projection board, 4-light source module, 5-light source angle adjustment seat, 51-horizontal end, 52-vertical end, 6-lens clamping mechanism, 7-shooting unit. Detailed Implementation

[0026] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0028] Example 1

[0029] refer to Figure 1 This invention provides a lens fogging defect detection device, comprising: a bracket 1, a rotating mechanism 2 mounted on the bracket 1, a horizontal black projection plate 3 fixed on the rotating mechanism 2, a light source module 4 inclined outwards from the edge of the projection plate 3, a lens clamping mechanism 6 horizontally clamping a lens mounted above the projection plate 3, and an imaging unit 7 disposed above the lens clamping mechanism 6. The lens clamping mechanism 6 and the imaging unit 7 can be respectively connected via a first bracket (…). Figure 1 (not shown in the image) and the second support ( Figure 1 (Not shown in the image) is fixed. Thus, by fixing a horizontal black projection plate 3 to the rotating mechanism 2, a light source module 4 inclined outwards is connected to the edge of the projection plate 3, and a lens clamping mechanism 6 horizontally clamps the lens above the projection plate 3. This causes the light emitted by the light source module 4 to strike the lens clamped by the lens clamping mechanism 6 at a certain angle. The imaging unit 7 above the projection plate 3 captures an image of the lens, thus obtaining a defect image of a local area on the lens. Then, the rotating mechanism 2 is rotated by a predetermined angle to obtain multiple lens images captured under incident light at the same angle from different directions, thus obtaining defect images of other local areas on the lens. Finally, multiple lens images are combined to detect lens haze defects, improving the accuracy and efficiency of lens haze defect detection.

[0030] In this configuration, the projection panel 3 and the light source module 4 can be connected in a fixed manner (e.g., by a fixed clip), thus forming a fixed angle between them. Preferably, the projection panel 3 and the light source module 4 are connected by a rotatable connection, allowing the angle between them to be adjusted by rotation. For example, in a preferred embodiment, the projection panel 3 is connected to the light source module 4 via a light source angle adjustment seat 5; wherein the light source angle adjustment seat 5 can adjust the angle between the projection panel 3 and the light source module 4.

[0031] In one example, such as Figure 1 The light source angle adjustment seat 5 includes: at least two support seats located on the edge of the projection plate 3. The opposite ends of the two support seats are respectively provided with a first slot and a height-adjustable support member. The edge of the light source module 4 is provided with a first locking strip that matches the first slot. The two ends of the first locking strip are respectively locked into the two first locking strips, allowing the light source module 4 to rotate along the first locking strips. When the target angle is reached, the height of the support member is adjusted so that the support member supports the rotating edge of the light source module 4, thereby fixing the target angle. Specifically: the support seat is formed by a horizontal end 51 and a vertical end 52, creating a side L-shape. The projection plate 3 includes at least one straight edge. The two support seats are respectively fixed to the two ends of the straight edge, and the openings of the side L-shape are opposite each other. The slot is located within the horizontal end 51, and a support member is fixed to at least one side of the slot on the horizontal end 51. The support component may include: a fixed support rod and a sliding support rod that can slide vertically within the fixed support rod. The inner wall of the fixed support rod has annular grooves at different heights, and the outer wall of the sliding support rod has annular buckles that match the annular grooves. The height of the support component is fixed by the annular grooves and buckles. Furthermore, to improve the fixing effect and prevent the light source module 4 from moving during rotation, a fixing component can be provided at the top of the support component. Optionally, the fixing component can be a suction cup, magnet, etc.

[0032] In another example, the light source angle adjustment seat 5 includes: a slot track located on the edge of the projection panel 3, wherein the slot track has multiple second slots at different angles to the horizontal direction, and the edge of the light source module 4 has second locking strips that match the second slots. Thus, according to the required angle, the second locking strips can be engaged in the corresponding second slots. The slot track and the multiple second slots can be manufactured using an integral molding process.

[0033] The bracket 1 can be a fixed-height bracket. In a preferred embodiment, the bracket 1 is designed as a height-adjustable bracket to facilitate adjusting the distance between the projection panel 3 and the lens clamping mechanism 6 (i.e., the lens), thereby improving the image capture effect. Figure 1 The height-adjustable bracket includes a first bracket and a second bracket. The first bracket is provided with a height-adjustable track in the vertical direction. The height-adjustable track is provided with fixing holes at different heights. The bottom of the side wall of the second bracket is provided with a protruding column, and the top of the protruding column is provided with an embedded ring. The embedded ring is embedded in the track. The protruding column can slide along the height-adjustable track to the fixing holes at different heights and be fixed by the embedded ring, thereby achieving the effect of height adjustment.

[0034] The projection plate 3 includes at least one straight edge, preferably, as shown in the example. Figure 1The projection panel 3 is formed by straight edges and curved edges, and the light source module 4 is installed on the edge of the straight edge. The angle between the light source module 4 and the horizontal plane can be adjusted from 45° to 60°.

[0035] The light source module 4 is capable of emitting a surface light source, and may include: a light source panel and a lampshade, wherein multiple LEDs are arranged in an array on the light source panel. Preferably, the LEDs are LEDs that emit blue light.

[0036] The lens clamping mechanism 6 may include: a mounting base installed on the edge of a rotary table, and a first clamping arm and a second clamping arm symmetrically arranged on the mounting base. Optionally, the first clamping arm and the second clamping arm can slide along one edge of the mounting base. When the first clamping arm and the second clamping arm slide towards each other, the lens can be clamped; when the first clamping arm and the second clamping arm slide away from each other, the lens can be released. Specifically, a slider can be provided on the mounting base, and a slide rail that cooperates with the slider can be provided on the first clamping arm and the second clamping arm; or, a slide rail can be provided on the mounting base, and a slider that cooperates with the slide rail can be provided on the first clamping arm and the second clamping arm. Optionally, the mounting base may adopt a gripper cylinder body, and the first clamping arm and the second clamping arm may be set as grippers on the mounting base to form a gripper cylinder structure. By controlling the gripper cylinder body, the opening and closing of the first clamping arm and the second clamping arm can be realized to complete the clamping of the lens.

[0037] Example 2

[0038] refer to Figure 2 Embodiment 2 of the present invention provides a method for detecting lens haze defects, using any of the lens haze defect detection devices described in Embodiment 1 for detection, the method comprising:

[0039] S1. Install the lens onto the lens clamping mechanism;

[0040] S2. Turn on the light source module and control the imaging unit to capture images;

[0041] S3. After controlling the rotating mechanism to rotate by a predetermined angle r, control the imaging unit to capture an image;

[0042] Wherein, the preset angle r can be set according to the number of images captured, for example: the preset angle r = 360 / n, where n is the number of images captured. When the shooting accuracy requirement is relatively high, n can be selected as a relatively large natural number; when the shooting accuracy requirement is not high, n can be selected as 2.

[0043] It should be noted that when n=2, the predetermined angle r=180°, then after performing this step, step S5 is executed directly.

[0044] S4. Determine whether the rotating mechanism has rotated one full revolution;

[0045] S5. If the rotating mechanism has not rotated a full revolution, return to step S3;

[0046] S6. If the rotating mechanism completes one full rotation, determine whether the lens has a fogging defect based on all the captured images.

[0047] In summary, the lens haze defect detection device and method of the present invention, by fixing a horizontal black projection plate 3 on a rotating mechanism 2, connecting a light source module 4 inclined outward to the edge of the projection plate 3, and installing a lens clamping mechanism 6 horizontally clamping the lens above the projection plate 3, allows the light emitted by the light source module 4 to be directed at a certain angle onto the lens clamped by the lens clamping mechanism 6. The lens image is captured by the imaging unit 7 above the projection plate 3, thus obtaining a defect image of a local area on the lens. Then, the rotating mechanism 2 is rotated by a predetermined angle to obtain multiple lens images captured under incident light at the same incident angle from different directions, thereby obtaining defect images of other local areas on the lens. Finally, the lens haze defects are detected by combining multiple lens images, improving the accuracy and efficiency of lens haze defect detection. Compared with the prior art, the present invention has at least the following beneficial effects:

[0048] 1. By performing localized inspections of different areas of the lens and combining the images from each localized inspection, the results of determining whether the lens has fogging defects are more accurate than taking a single image of the entire lens.

[0049] 2. A projection plate 3 is set on the rotating mechanism 2. A light source module 4 that is inclined outwards from the edge of the projection plate 3 is connected to the edge of the projection plate 3. A lens clamping mechanism 6 that horizontally clamps the lens is installed above the projection plate 3. Each time a picture is taken, the rotating mechanism 2 is rotated by a predetermined angle to ensure that the light emitted by the light source module 4 is incident on the lens clamped by the lens clamping mechanism 6 at the same incident angle each time a picture is taken. Thus, multiple lens images under the incident light at the same incident angle in different directions are obtained through the shooting unit 7, ensuring the accuracy of the detection.

[0050] 3. Using a black projection board 3 makes the captured image a black background with a white image, making it easier to detect whether there are hazy defects on the white lens against a black background.

[0051] It should be clarified that the present invention is not limited to the specific structures and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known structures are omitted here. In the above embodiments, several specific structures are described and shown as examples. However, the lens cleaning device of the present invention is not limited to the specific structures described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the installation positions between structures, after understanding the spirit of the present invention.

[0052] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the structures, modules, and units described above can be referred to the corresponding processes in the foregoing embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A device for detecting lens fogging defects, characterized in that, include: A bracket, a rotating mechanism mounted on the bracket, a horizontal black projection plate fixed on the rotating mechanism, a light source module inclined outwards connected to the edge of the projection plate, a lens clamping mechanism for horizontally clamping a lens mounted above the projection plate, and a shooting unit mounted above the lens clamping mechanism; The projection panel is connected to the light source module via a light source angle adjustment seat; the light source angle adjustment seat includes: at least two support seats disposed on the edge of the projection panel, the opposite ends of the two support seats are respectively provided with a first slot and a height-adjustable support member, and the edge of the light source module is provided with a first locking strip that matches the first slot; or, the light source angle adjustment seat includes: a slot track disposed on the edge of the projection panel, the slot track is provided with a plurality of second slots at different angles to the horizontal direction, and the edge of the light source module is provided with a second locking strip that matches the second slot; The bracket is a height-adjustable bracket, comprising: a first bracket and a second bracket. The first bracket is provided with a height-adjustable track in the vertical direction. The height-adjustable track is provided with fixing holes at different heights. The bottom of the side wall of the second bracket is provided with a protruding column, and the top of the protruding column is provided with an embedded ring. The embedded ring is embedded in the track. The protruding column can slide along the height-adjustable track to the fixing holes at different heights and be fixed by the embedded ring.

2. The lens fogging defect detection device according to claim 1, characterized in that, The support base is formed by a horizontal end and a vertical end, forming a side L-shape. The projection plate includes at least one straight edge. Two support bases are respectively fixed at both ends of the straight edge, and the openings of the side L-shape are opposite to each other. The first slot is located inside the horizontal end, and a support member is fixed on at least one side of the horizontal end located in the first slot.

3. The lens fogging defect detection device according to claim 1, characterized in that, The angle between the light source module and the horizontal plane can be adjusted from 45° to 60°.

4. A method for detecting lens fogging defects using the lens fogging defect detection device according to any one of claims 1-3, characterized in that, include: S1. Install the lens onto the lens clamping mechanism; S2. Turn on the light source module and control the imaging unit to capture images; S3. After controlling the rotating mechanism to rotate by a predetermined angle r, control the imaging unit to capture an image; S4. Determine whether the rotating mechanism has rotated one full revolution; S5. If the rotating mechanism completes one full rotation, determine whether the lens has a fogging defect based on all the captured images.

Images