An AOI inspection device for lens appearance defect detection

Abstract

The present invention relates to the field of optical inspection technology, specifically to an AOI inspection device for lens appearance defect inspection, including a housing, a loading suction cup and a turntable, and also including a camera, a sealing assembly and a baffle assembly, wherein the camera is connected to the inside of the housing and is located above the turntable, the sealing assembly is connected to the camera, the baffle assembly is connected to the turntable and cooperates with the sealing assembly, the camera is sealed by the sealing assembly, the baffle assembly drives the inspection lens to move, the sealing assembly is opened by the baffle assembly, and the sealing assembly and the baffle assembly form a closed space. The present invention sets a sealing assembly, and seals the bottom of the camera by a first rotating plate and a second rotating plate when not inspected, thereby preventing the camera lens from being contaminated with dust during storage, and the second rotating plate is in contact with the front baffle and the rear baffle, so that the lens is in a closed space, thereby preventing external light sources from affecting the inspection results.

Description

Technical Field

[0001] The present invention relates to the field of optical inspection technology, and in particular to an AOI inspection device for inspecting appearance defects of a lens. Background Art

[0002] The lens appearance defect detection mainly includes detecting whether there are bubbles, stains, impurities, cracks on the lens surface and whether the coating is uniform, smooth and free of bubbles or peeling. During the detection process, the commonly used detection equipment is the AOI detection equipment. The working principle of the AOI detection equipment is to automatically scan the product to be tested through a high-definition camera, collect images, and compare the test points with the qualified parameters in the database. After image processing, the defects on the target product are detected and displayed or marked through a display or automatic mark for maintenance personnel to repair and SMT engineering personnel to improve the process.

[0003] When inspecting high-precision lenses, such as those used in medical surgeries, there are high requirements for pixels, so the quality requirements for appearance are also very high. The inspection requirements reach the micron level. The appearance of fine spots and stains on the lens of the inspection camera will also affect the inspection results. The stains on the lens of the inspection camera usually come from dust in the air. When the dust in the air adheres to the lens of the inspection camera, it will cause the photographed image to be unclear, thus affecting the inspection results. In order to avoid the influence of external dust, the best method is to conduct inspection in a dust-free workshop. However, the cost of a dust-free workshop is high, and not all manufacturers can be equipped with a dust-free workshop. These factories can only use AOI inspection equipment to inspect the lens under conventional conditions, which makes it easy for the AOI inspection equipment to be contaminated with dust on the lens of the camera when it is stored, resulting in shadows in the image, affecting the inspection results.

[0004] Therefore, an AOI inspection device for lens appearance defect inspection is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an AOI inspection device for lens appearance defect inspection. In order to solve the problem that the lens of the camera is contaminated with dust during storage and affects the inspection result, a sealing structure is used. The sealing structure is closed when not being inspected to prevent the lens of the camera from being dusty during long-term storage. The sealing component will be opened during inspection and cooperate with the baffle component when opened to place the lens in a closed space during inspection to prevent external light from affecting the inspection result.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An AOI inspection device for lens appearance defect inspection comprises a housing, a loading suction cup and a turntable, and also comprises a camera, a sealing assembly and a baffle assembly. The camera is connected to the inside of the housing and is located above the turntable. The sealing assembly is connected to the camera. The baffle assembly is connected to the turntable and cooperates with the sealing assembly. The camera is sealed by the sealing assembly. The baffle assembly drives the inspection lens to move. The sealing assembly is opened by the baffle assembly. The sealing assembly and the baffle assembly form a closed space.

[0008] In the above scheme, the bottom of the camera is sealed by the sealing assembly when not in use to prevent dust from falling, and the lens to be inspected is placed on the baffle assembly by the loading suction cup. The baffle assembly limits the lens to prevent the lens from being displaced and misaligned with the camera under the action of centrifugal force when the turntable rotates, making it impossible to detect the lens completely, thereby affecting the detection result.

[0009] Preferably, the sealing assembly includes an outer frame, a first rotating plate and a second rotating plate, the outer frame is connected to the bottom of the camera, and the cross-section of the outer frame is set to a rectangle, the first rotating plate is hinged to the bottom of the outer frame, the second rotating plate is hinged to the first rotating plate, and a reset assembly is connected above the second rotating plate.

[0010] In the above scheme, the baffle assembly pushes the first rotating plate and the second rotating plate to rotate, and the bottom of the camera is opened for detection. When the detection is completed, the first rotating plate and the second rotating plate are reset under the push of the reset assembly to seal the bottom of the camera, thereby preventing the camera lens from being contaminated with dust during storage and affecting the detection results.

[0011] Preferably, a rubber pad is connected to one side of the two second rotating plates away from the first rotating plate, and the cross section of the rubber pad is a right-angled trapezoid with the wide side facing upward.

[0012] In the above scheme, when closed, the two rubber pads will squeeze each other to avoid a gap between the two second rotating plates, and when the second rotating plates are opened and reset, the rubber pads also play a buffering role to avoid direct collision between the two second rotating plates, thereby reducing damage.

[0013] Preferably, the baffle assembly includes a base, a front baffle and a rear baffle, the base is connected above the turntable, the front baffle and the rear baffle are both connected above the base, and the cross-section of the front baffle is set to be V-shaped.

[0014] In the above scheme, the lens is placed on the base by means of the loading suction cup, and the lens is limited by the front baffle and the rear baffle, thereby preventing the position of the lens from shifting due to inertia when the turntable stops rotating, which results in the lens not being able to be completely photographed by the camera during detection. At the same time, during detection, the second rotating plate fits with the left and right sides of the front baffle and the rear baffle, so that the lens is in a closed space. When the camera takes pictures, the light inside the camera will turn on, but when there is an external light source, it will affect the effect of the flash, and thus affect the quality of the picture. The second rotating plate, the front baffle and the rear baffle form a closed space, so that external light cannot illuminate the lens, thereby preventing external light sources from affecting the detection results.

[0015] Furthermore, a ball bearing is connected to the outer wall of the front baffle, and the ball bearing cooperates with the rubber pad.

[0016] In the above scheme, when the sealing assembly moves forward, the rubber pad is pushed by the inclined surface of the front plate to rotate the second rotating plate. In order to avoid excessive friction between the rubber pad and the front baffle, the friction between the front baffle and the rubber pad is reduced by the ball bearing, thereby reducing the wear between the structures and improving the service life.

[0017] Preferably, the length of the second rotating plate is equal to the distance between the front baffle and the rear baffle, a slide groove is provided on the top of the base, a pressure plate is hinged inside the slide groove, and a compression spring is connected below the pressure plate.

[0018] In the above solution, the left and right movement of the lens is limited by the pressure plate before detection, so as to avoid the position of the lens being offset due to the centrifugal force when the turntable rotates, resulting in the lens not being able to be completely photographed by the camera during detection.

[0019] Preferably, the reset assembly includes a through hole, a slider, a moving rod, a spiral groove, a straight groove and a reset spring, the through hole is opened on the left and right sides of the inner wall of the outer frame, the slider is connected to the inner wall of the through hole, the moving rod is slidably connected to the inside of the through hole, and the end of the moving rod is hinged to the second rotating plate, the spiral groove and the straight groove are both opened on the outer wall of the moving rod, and the spiral groove and the straight groove are connected, the slider is slidably connected to the straight groove, and the reset spring is connected to the outer wall of the moving rod.

[0020] In the above scheme, the slider is connected to the straight groove during sealing, so when the front baffle pushes the second rotating plate, the moving rod will be easily pushed by the second rotating plate and can also be easily pushed out of the through hole. When the bottom of the camera is fully opened, the slider enters the spiral groove, and when the front baffle and the rear baffle are separated from the second rotating plate, the reset spring drives the first rotating plate and the second rotating plate to reset by pushing the moving rod. However, the frequent opening and closing of the first rotating plate and the second rotating plate are prone to mechanical fatigue. By setting the spiral groove, the reset time of the moving rod is increased, so that the moving rod will be opened by the next front baffle before it is reset.

[0021] Preferably, the length of the pressing plate is greater than the length of the sliding groove, and the rear side of the pressing plate extends to the outside of the sliding groove.

[0022] A blowing head is also provided inside the shell to blow away unqualified products. In the above scheme, when the second rotating plate is separated from the camera, since the length of the pressure plate is greater than the length of the slide groove, the pressure plate is still pressed inside the slide groove by the second rotating plate, thereby facilitating the lens to be blown off the base by the blowing head when unqualified products are detected.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By setting a sealing component, the bottom of the camera is sealed by the first rotating plate and the second rotating plate when not testing, so as to prevent the camera lens from being contaminated by dust during storage, and the second rotating plate is in contact with the front baffle and the rear baffle, so that the lens is in a closed space, thereby preventing external light sources from affecting the test results.

[0025] 2. By setting the baffle assembly, the lens is limited by the front baffle, the rear baffle and the pressure plate, so as to avoid the lens position shifting when the turntable rotates and stops, resulting in the lens not being able to be completely photographed by the camera during detection, and during detection.

[0026] 3. By setting a reset component, when the baffle assembly pushes the lower end of the second rotating plate to move toward the edge of the outer frame, the reset spring acts as a buffer for the second rotating plate to avoid impact between the second rotating plate and the outer frame. At the same time, when resetting, the spiral groove increases the reset time of the moving rod, so that the moving rod will be opened by the next front baffle before resetting, avoiding frequent opening and closing of the first rotating plate and the second rotating plate, thereby improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the turntable of the present invention;

[0029] Figure 3 It is a schematic diagram of the camera structure of the present invention;

[0030] Figure 4 is a cross-sectional view of a camera of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the baffle assembly of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the mobile rod of the present invention;

[0033] Figure 7 For the present invention Figure 4 A magnified view of part A;

[0034] Figure 8 It is a schematic diagram of the sealing structure of the present invention when it is closed;

[0035] Fig. 9 It is a schematic diagram of the sealing structure of the present invention when it is opened.

[0036] In the figure: 1. outer shell; 2. feeding suction cup; 3. turntable; 4. camera; 5. sealing assembly; 501. outer frame; 502. first rotating plate; 503. second rotating plate; 504. rubber pad; 6. baffle assembly; 601. base; 602. front baffle; 603. rear baffle; 604. slide groove; 605. pressure plate; 606. compression spring; 607. ball bearing; 7. reset assembly; 701. through hole; 702. slider; 703. moving rod; 704. spiral groove; 705. straight groove; 706. reset spring. DETAILED DESCRIPTION

[0037] 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, and combine the working state to make its structural features more detailed. Obviously, the described embodiments 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 work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 9 The present invention provides an AOI inspection device for lens appearance defect inspection, and the technical solution is as follows:

[0039] An AOI inspection device for lens appearance defect detection, referring to Figure 1 , Figure 2 , Figure 3 , Figure 8 and Fig. 9, including a shell 1, a loading suction cup 2 and a turntable 3, the loading suction cup 2 and the turntable 3 are both connected to the inside of the shell 1, the loading suction cup 2 is located above the turntable 3, and also includes a camera 4, a sealing assembly 5 and a baffle assembly 6, the camera 4 is connected to the inside of the shell 1, the lens to be detected is placed on the baffle assembly 6 through the loading suction cup 2, and is located above the turntable 3, the sealing assembly 5 is connected to the camera 4, the baffle assembly 6 is connected to the turntable 3, and cooperates with the sealing assembly 5, the camera 4 is sealed by the sealing assembly 5, and the bottom of the camera 4 is sealed when not in use to prevent dust from falling, the baffle assembly 6 drives the detection lens to move, the baffle assembly 6 plays a limiting role on the lens, to prevent the lens from being displaced and misaligned with the camera 4 under the action of centrifugal force when the turntable 3 rotates, resulting in the lens being unable to be completely detected, thereby affecting the detection result, and the sealing assembly 5 and the baffle assembly 6 form a closed space.

[0040] As an embodiment of the present invention, refer to Figure 4 and Figure 6 The sealing assembly 5 includes an outer frame 501, a first rotating plate 502 and a second rotating plate 503. The outer frame 501 is connected to the bottom of the camera 4, and the cross-section of the outer frame 501 is set to a rectangle. The first rotating plate 502 is hinged to the bottom of the outer frame 501, and the second rotating plate 503 is hinged to the first rotating plate 502. When not detecting, the bottom of the camera 4 is sealed by rotating the first rotating plate 502 and the second rotating plate 503, so as to prevent the lens of the camera 4 from being contaminated with dust during the storage process of the camera 4, which affects the detection result. A reset assembly 7 is connected above the second rotating plate 503. During detection, the baffle assembly 6 is moved by the turntable 3. When the baffle assembly 6 moves to the bottom of the camera 4, it first contacts the second rotating plate 503. The lower end of the second rotating plate 503 is pushed by the baffle assembly 6 to move toward the edge of the outer frame 501, and deflects downward at the hinge with the first rotating plate 502, so as to open the bottom of the camera 4. When the detection is completed, the first rotating plate 502 and the second rotating plate 503 are reset under the push of the reset assembly 7.

[0041] As an embodiment of the present invention, refer to Figure 4 A rubber pad 504 is connected to one side of the two second rotating plates 503 away from the first rotating plate 502. When closed, the two rubber pads 504 will squeeze each other to avoid a gap between the two second rotating plates 503. After the second rotating plates 503 are opened and reset, the rubber pad 504 also plays a buffering role to avoid direct collision between the two second rotating plates 503, thereby reducing damage. The cross-section of the rubber pad 504 is set to a right-angled trapezoid with the wide side facing upward.

[0042] As an embodiment of the present invention, refer to Figure 5The baffle assembly 6 includes a base 601, a front baffle 602 and a rear baffle 603. The base 601 is connected to the top of the turntable 3. The front baffle 602 and the rear baffle 603 are both connected to the top of the base 601. The lens is placed on the base 601 through the loading suction cup 2, and the front baffle 602 and the rear baffle 603 limit the lens, thereby preventing the position of the lens from shifting due to inertia when the turntable 3 stops rotating, thereby causing the lens to be unable to be completely photographed by the camera 4 during detection. The cross-section of the front baffle 602 is set to be V-shaped. During detection, the second rotating plate 503 is pushed to move by the inclined surface of the front baffle 602. When the second rotating plate 503 is perpendicular to the lens of the camera 4 and contacts the front baffle 602 and the rear baffle 603 at the same time, the lens is in a closed space, thereby preventing external light sources from affecting the detection results.

[0043] As an embodiment of the present invention, refer to Figure 5 The outer wall of the front baffle plate 602 is connected to a ball 607, and the ball 607 cooperates with the rubber pad 504. In order to avoid excessive friction between the rubber pad 504 and the front baffle plate 602, the friction between the front baffle plate 602 and the rubber pad 504 is reduced by the ball 607, thereby reducing the wear between the structures and improving the service life.

[0044] As an embodiment of the present invention, refer to Figure 5 , the length of the second rotating plate 503 is equal to the distance between the front baffle plate 602 and the rear baffle plate 603, a slide groove 604 is provided on the top of the base 601, and a pressure plate 605 is hinged inside the slide groove 604. The pressure plate 605 limits the left and right movement of the lens, thereby preventing the position of the lens from being offset under the action of centrifugal force when the turntable 3 rotates, thereby causing the lens to not be completely photographed by the camera 4 during detection. When the second rotating plate 503 forms a closed space with the front baffle plate 602 and the rear baffle plate 603, the second rotating plate 503 will press the pressure plate 605 into the slide groove 604, and a compression spring 606 is connected below the pressure plate 605.

[0045] As an embodiment of the present invention, refer to Figure 6 and Figure 7The reset assembly 7 includes a through hole 701, a slider 702, a moving rod 703, a spiral groove 704, a straight groove 705 and a reset spring 706. The through hole 701 is opened on the left and right sides of the inner wall of the outer frame 501. The slider 702 is connected to the inner wall of the through hole 701. The moving rod 703 is slidably connected to the inside of the through hole 701, and the end of the moving rod 703 is hinged to the second rotating plate 503. The moving rod 703 is a double-layer structure, the outer layer is rotatable, and the spiral groove 704 is connected to the inner wall of the through hole 701. The straight grooves 705 are all opened on the outer layer of the moving rod 703, and the spiral grooves 704 are connected to the straight grooves 705, wherein there is a height difference between the spiral grooves 704 and the straight grooves 705, the depth of the spiral grooves 704 near the hinge of the moving rod 703 is greater than the depth of the straight grooves 705, and the depth of the spiral grooves 704 away from the hinge of the moving rod 703 is less than the depth of the straight grooves 705, the slider 702 is slidably connected to the straight grooves 705, the reset spring 706 is connected to the outer wall of the moving rod 703, and the slider 702 is sealed when the slider 702 is closed. 02 is connected to the straight groove 705, so when the front baffle 602 pushes the second rotating plate 503, the moving rod 703 will be easily pushed by the second rotating plate 503 and can also be easily pushed out of the through hole 701. When the bottom of the camera 4 is fully opened, the slider 702 enters the spiral groove 704 and is located at the connection between the spiral groove 704 and the straight groove 705 near the hinge of the moving rod 703. When the front baffle 602 and the rear baffle 603 are separated from the second rotating plate 503, the return spring 706 is released. The first rotating plate 502 and the second rotating plate 503 are driven to reset by pushing the moving rod 703. However, the frequent opening and closing of the first rotating plate 502 and the second rotating plate 503 may easily cause mechanical fatigue. When resetting, the slider 702 can only move in the spiral groove 704 because of the height difference between the spiral groove 704 and the straight groove 705. By setting the spiral groove 704, the reset time of the moving rod 703 is increased, so that the moving rod 703 will be opened by the next front baffle 602 before resetting.

[0046] As an embodiment of the present invention, refer to Figure 5 The length of the pressing plate 605 is greater than the length of the slide groove 604, and the rear side of the pressing plate 605 extends to the outside of the slide groove 604. When the rear baffle 603 is separated from the camera 4, since the length of the pressing plate 605 is greater than the length of the slide groove 604, the pressing plate 605 is still pressed inside the slide groove 604 by the second rotating plate 503, so that it is convenient to blow the lens off the base 601 through the blowing head inside the shell 1 when the detection fails.

[0047] Working principle: When inspecting the lens, the lens is placed on the baffle assembly 6 through the loading suction cup 2, and then the baffle assembly 6 is driven by the turntable 3 to transfer the lens to the bottom of the camera 4 and then stop, and the camera 4 is started to take pictures for inspection. When the inspection is qualified, the turntable 3 continues to rotate and transports the lens to the bottom of the next loading suction cup 2, and then the lens is removed from the baffle assembly 6 through the loading suction cup 2. When the inspection fails, when the baffle assembly 6 is separated from the camera 4, the lens is blown away from the baffle assembly 6 through the blowing head.

[0048] In order to prevent dust from getting on the lens of the camera 4 during storage, thereby affecting the detection results, a sealing assembly 5 is provided to seal the bottom of the camera 4 during storage to prevent the lens of the camera 4 from being contaminated. During detection, the sealing assembly 5 is pushed by the baffle assembly 6 to cooperate, so that the lens is in a closed space during detection, thereby preventing external light from affecting the detection results.

[0049] Specifically: during detection, when the front baffle 602 contacts the inclined surface of the rubber pad 504, the inclined surface of the front baffle 602 pushes the end of the second rotating plate 503 to move toward the edge of the outer frame 501, and at the same time, the hinge between the second rotating plate 503 and the first rotating plate 502 deflects downward, thereby opening the bottom of the camera 4, and the baffle assembly 6 continues to move until the second rotating plate 503 contacts the front baffle 602 and the rear baffle 603 at the same time, so that the lens is in a closed space to avoid being affected by external light sources when the camera 4 is started for photo detection. When the detection is completed and the baffle assembly 6 is separated from the camera 4, the reset spring 706 pushes the moving rod 703 to reset the second rotating plate 503 and the first rotating plate 502.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An AOI inspection device for detecting lens appearance defects, comprising a housing (1), a loading suction cup (2) and a turntable (3), characterized in that: The apparatus further comprises a camera (4), a sealing assembly (5) and a baffle assembly (6), wherein the camera (4) is connected to the inside of the housing (1) and is located above the turntable (3), the sealing assembly (5) is connected to the camera (4), the baffle assembly (6) is connected to the turntable (3) and cooperates with the sealing assembly (5), the camera (4) is sealed by the sealing assembly (5), the baffle assembly (6) drives the detection lens to move, the sealing assembly (5) is opened by the baffle assembly (6), and the sealing assembly (5) and the baffle assembly (6) form a closed space; The sealing assembly (5) comprises an outer frame (501), a first rotating plate (502) and a second rotating plate (503); the outer frame (501) is connected to the bottom of the camera (4); the cross section of the outer frame (501) is set to be rectangular; the first rotating plate (502) is hinged to the bottom of the outer frame (501); the second rotating plate (503) is hinged to the first rotating plate (502); and a reset assembly (7) is connected above the second rotating plate (503); The baffle assembly (6) comprises a base (601), a front baffle (602) and a rear baffle (603); the base (601) is connected above the turntable (3); the front baffle (602) and the rear baffle (603) are both connected above the base (601); and the cross section of the front baffle (602) is set to be V-shaped.

2. The AOI inspection device for lens appearance defect inspection according to claim 1, characterized in that: A rubber pad (504) is connected to one side of the two second rotating plates (503) away from the first rotating plate (502); the cross section of the rubber pad (504) is a right-angled trapezoid with the wide side facing upwards.

3. The AOI inspection device for lens appearance defect inspection according to claim 1, characterized in that: A ball bearing (607) is connected to the outer wall of the front baffle (602), and the ball bearing (607) cooperates with the rubber pad (504).

4. The AOI inspection device for lens appearance defect inspection according to claim 2, characterized in that: The length of the second rotating plate (503) is equal to the distance between the front baffle (602) and the rear baffle (603), a slide groove (604) is provided on the top of the base (601), a pressure plate (605) is hinged inside the slide groove (604), and a compression spring (606) is connected below the pressure plate (605).

5. The AOI inspection device for lens appearance defect inspection according to claim 4, characterized in that: The length of the pressing plate (605) is greater than the length of the sliding groove (604), and the rear side of the pressing plate (605) extends to the outside of the sliding groove (604).

6. The AOI inspection device for lens appearance defect inspection according to claim 2, characterized in that: The reset assembly (7) comprises a through hole (701), a slider (702), a moving rod (703), a spiral groove (704), a straight groove (705) and a reset spring (706); the through hole (701) is formed on the left and right sides of the inner wall of the outer frame (501); the slider (702) is connected to the inner wall of the through hole (701); the moving rod (703) is slidably connected to the inside of the through hole (701); and the end of the moving rod (703) is hinged to the second rotating plate (503); the spiral groove (704) and the straight groove (705) are both formed on the outer wall of the moving rod (703); the spiral groove (704) and the straight groove (705) are communicated; the slider (702) is slidably connected to the straight groove (705); and the reset spring (706) is connected to the outer wall of the moving rod (703).

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