A joint gap detection mechanism and method for lens mold

Abstract

The present invention provides a method for detecting a joint gap of a lens mold, comprising the following steps: S1: positioning the lens mold and a camera assembly so that the center of the lens mold is moved to the center position of the field of view of a CCD camera 306 in the camera assembly; S2: judging whether the lens mold is a chamfered and leaking mold, and adjusting a light shielding plate accordingly, thereby performing fill light on the joint gap of the lens mold; under the premise of not affecting the field of view of the camera assembly, the fill light assembly can emit parallel light and diffusely reflected light through the design of a light-emitting plate and a reflective plate, and adjust the type of light irradiated on the circumferential surface of the lens module by adjusting the lifting height of the light shielding plate, so as to meet the fill light requirements of different lens modules, so that the camera assembly can accurately find the joint gap of the lens module, thereby avoiding excessive extrusion of the mold and the lens due to failure to accurately find the joint gap during the mold opening process, and even damage to the mold and the lens.

Description

Technical Field

[0001] The invention relates to the technical field of lens mold opening, and in particular to a joint gap detection mechanism and method for lens molds. Background Art

[0002] Optical lenses are currently mainly made of resin as raw materials. In the lens processing and production, two round glasses (A mold and B mold, A mold is convex, B mold is concave) and tape are first used to make a mold, and the resin liquid is poured into the mold. After long-term heating and curing, the lens is formed. The cured mold needs to be squeezed manually through a simple extrusion mechanism at the intersection of the B mold and the lens, so that the lens is deformed and separated from the mold;

[0003] In the prior art, a camera assembly is generally used to find the intersection gap. For example, Publication (Announcement) No. CN216578849U proposes an automated mold opening device using a metal cutter head as a lens mold opening tool. However, due to the high permeability of the mold and the lens, the camera assembly cannot accurately find the intersection gap point between the mold and the lens, resulting in excessive squeezing of the mold and the lens during the mold opening process, causing damage to the mold and the lens. Summary of the invention

[0004] In view of this, the problem to be solved by the present invention is to provide a joint gap detection mechanism and method for lens molds.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A method for detecting a joint gap of a lens mold comprises the following steps:

[0007] S1: Positioning the lens mold and the camera assembly so that the center of the lens mold moves to the center of the field of view of the CCD camera 306 in the camera assembly;

[0008] S2: By determining whether the lens mold is a chamfered and exposed mold, the light shielding plate is adjusted accordingly, and then the joint gap of the lens mold is supplemented with light.

[0009] The chamfered and leaking mold is a lens mold that is concave relative to the A mold and the B mold to form a chamfer after the resin is cured. Otherwise, it is a non-chamfered and leaking mold. The resin at the intersection gap of the non-chamfered and leaking mold forms an inner groove.

[0010] If the lens mold is a chamfered and exposed mold, the light-blocking plate driving component drives the light-blocking plate to move in a direction away from the light-emitting plate, so that the diffusely reflected light emitted by the light-emitting plate and the parallel light reflected by the reflective plate illuminate the chamfer at the intersection gap from multiple angles, and then enter the imaging range of the CCD camera through the reflection effect of the chamfer, thereby enhancing the brightness of the chamfer at the intersection gap of the lens mold.

[0011] If the lens mold is a non-chamfered exposed mold, the light baffle driving component drives the light baffle to move in the direction close to the light-emitting board, preventing the diffuse reflected light emitted by the light-emitting board from irradiating the non-chamfered exposed mold. The inner groove reflects the parallel light outside the imaging range of the CCD camera, so that the inner groove and the resin around the inner groove form a brightness difference.

[0012] A joint gap detection mechanism for a lens mold, comprising a camera assembly and a fill light assembly, wherein the camera assembly is used to photograph the lens mold within an imaging range;

[0013] The fill light assembly includes a horizontally arranged light emitting plate and an inclinedly arranged reflective plate, wherein the reflective plate is used to reflect parallel light emitted by the light emitting plate onto the lens mold, and the fill light assembly also includes a light baffle plate, wherein the light baffle plate is connected to a light baffle plate driving member, and the light baffle plate driving member is used to drive the light baffle plate to move back and forth in the vertical direction of the light emitting plate, so as to prevent the diffusely reflected light emitted by the light emitting plate from irradiating the lens mold.

[0014] The fill light assembly also includes an n-shaped mounting frame, the light-emitting panel is horizontally mounted at the bottom open end of the n-shaped mounting frame, the reflective plate is obliquely mounted at the top of the n-shaped mounting frame, the inclination angle between the reflective plate and the light-emitting panel is 45 degrees, the length ratio range between the reflective plate and the light-emitting panel is 1:1.4-1:1.45, the length of the light-emitting panel is 70-80 mm, and when it is necessary to block the diffusely reflected light and only use parallel light to illuminate the intersection gap of the lens mold, the light-blocking plate rises 30-45 mm along the horizontal plane where the light-emitting panel is located.

[0015] The camera assembly is mounted on the servo lifting member, the camera assembly is located at the first opening side of the through cavity of the n-shaped mounting frame, and the light blocking plate is located at the second opening side of the through cavity of the n-shaped mounting frame.

[0016] The advantages and positive effects of the present invention are:

[0017] A fill light component is provided without affecting the shooting imaging field of the camera component. The fill light component can emit parallel light and diffusely reflected light through the design of the light-emitting plate and the reflective plate, and the type of light irradiated on the circumferential surface of the lens module can be adjusted by adjusting the lifting height of the light-blocking plate to meet the fill light requirements of different lens modules, so that the camera component can accurately find the joint gap of the lens module, avoiding excessive extrusion of the mold and the lens due to failure to find the joint gap during the mold opening process, and even damage to the mold and the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] In the attached picture:

[0020] Figure 1 is a schematic diagram of the lens module;

[0021] Figure 2 It is a schematic diagram of a joint gap detection mechanism for a lens mold of the present invention;

[0022] Figure 3 It is a schematic diagram of a fill light component in a joint gap detection mechanism for a lens mold of the present invention;

[0023] Figure 4 It is a chamfered leaking mold;

[0024] Figure 5 It is a non-chamfered exposed mold;

[0025] In the figure: A mold 105, B mold 101, frame 301, servo lifter mounting plate 302, light baffle driving cylinder 303, servo lifter 304, light baffle 305, CCD camera 306, camera assembly mounting plate 307, telecentric lens module 308, reflector 309-1, light emitting plate 309-2, n-shaped mounting frame 309-3, chamfer 41, inner groove 42. DETAILED DESCRIPTION

[0026] 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 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 creative work are within the scope of protection of the present invention.

[0027] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] The present invention provides a joint gap detection mechanism for a lens mold and a joint gap detection method for a lens mold;

[0030] like Figures 1 to 5 As shown, the joint gap detection mechanism for the lens mold includes a camera component and a fill light component, and the camera component is used to photograph the lens mold within the imaging range;

[0031] The fill light assembly includes a horizontally arranged light emitting plate 309-2 and an inclinedly arranged reflective plate 309-1, wherein the reflective plate 309-1 is used to reflect the parallel light emitted by the light emitting plate 309-2 onto the lens mold, and the fill light assembly also includes a light baffle 305, wherein the light baffle 305 is connected to a light baffle driving member, and in this embodiment, the light baffle driving member is a light baffle driving cylinder 303, wherein the light baffle driving cylinder 303 is used to drive the light baffle 305 to move back and forth along the vertical direction of the light emitting plate 309-2, so as to prevent the diffusely reflected light emitted by the light emitting plate 309-2 from irradiating the lens mold;

[0032] Specifically, the fill light assembly also includes an n-shaped mounting frame 309-3, the n-shaped mounting frame 309-3 is made of an opaque material as a whole, the light-emitting plate 309-2 is horizontally mounted on the bottom opening end of the n-shaped mounting frame 309-3, the reflector 309-1 is tiltedly mounted on the top of the n-shaped mounting frame 309-3, the camera assembly is located on the first opening side of the through cavity of the n-shaped mounting frame 309-3, the light-blocking plate 305 is located on the second opening side of the through cavity of the n-shaped mounting frame 309-3, and accordingly, the lens mold is placed on a surface that can be moved back and forth in the vertical direction. The lens mold is on a movable lifting platform (not shown in the figure) and is located on the outside of the light blocking plate 305, that is, the lens mold is away from the n-shaped mounting frame 309-3. On the one hand, this design can adjust the type of light irradiated on the circumferential surface of the lens module by adjusting the lifting height of the light blocking plate 305 to meet the fill light requirements of different lens modules. On the other hand, the lifting height of the light blocking plate 305 can be adjusted to ensure that there is no obstruction between the CCD camera 306 and the lens mold, which is convenient for adjusting the center of the lens mold to the center of the field of view of the CCD camera 306 to obtain a better shooting effect.

[0033] Specifically, the camera assembly is installed on the servo lifter 304, and the camera assembly includes a CCD camera 306, a camera assembly mounting plate 307, and a telecentric lens module 308. The servo lifter 304 is fixed to the frame 301 through the servo lifter mounting plate 302, the camera assembly mounting plate 307 is fixed to the servo lifter 304, and is driven to move up and down by the servo lifter 304. The CCD camera 306 is directly mounted on the camera assembly mounting plate 307, the telecentric lens module 308 is directly tightened on the CCD camera 306, and the light-emitting board 309-2 is also directly mounted on the camera assembly mounting plate 307. The light-blocking plate 305 is mounted on the light-blocking plate driving cylinder 303 and is close to the front of the light-emitting board 309-2. The upper and lower positions of the light-blocking plate 305 can be adjusted, and the lens mold takes pictures at a distance of about 1-2CM in front of the light-emitting board 309-2.

[0034] Wherein, the method for detecting the joint gap of the lens mold comprises the following steps:

[0035] S1: Positioning the lens mold and the camera assembly so that the center of the lens mold moves to the center of the field of view of the CCD camera 306 in the camera assembly;

[0036] When the lens mold is positioned, the light shielding plate 305 is located below the horizontal plane where the light emitting plate 309-2 is located, so that the diffuse reflected light emitted by the light emitting plate 309-2 and the parallel light reflected by the reflective plate 309-1 are both irradiated on the side (circumferential surface) of the mold, so that the light intensity between the edges of the B mold 101 and the A mold 105 in the lens mold is increased, which is convenient for the CCD camera 306 to accurately position, so that the intersection gap of the lens mold and the CCD camera 306 are close to the same axis;

[0037] S2: By judging whether the lens mold is a chamfered and exposed mold, the light shielding plate 305 is adjusted accordingly, and then the intersection gap of the lens mold is supplemented with light;

[0038] In the technical solution, it is found that when the lens mold is used to make an anti-blue light sheet, the intersection gap of the lens mold is concave relative to the A mold 105 and the B mold 101 after the resin is cured to form a chamfer 41. This is because the resin used to make the anti-blue light lens has a high shrinkage rate, so the chamfer 41 is exposed, so it is called a chamfer-exposed mold;

[0039] However, when the lens mold is used to make a white lens, the resin at the intersection of the lens mold has a high degree of fit with the A mold 105 and the B mold 101. However, due to the different materials and densities of the two, the resin at the intersection will form a very small inner groove 42. Therefore, when the A mold 105 and the B mold 101 need to be separated, it is necessary to cut along the inner groove 42. Such a lens mold is called a non-chamfered leaking mold.

[0040] If the lens mold is a chamfered and exposed mold, the light-blocking plate driving member drives the light-blocking plate 305 to move in a direction away from the light-emitting plate 309-2 and to below the horizontal plane where the light-emitting plate 309-2 is located, so that the diffuse reflected light emitted by the light-emitting plate 309-2 and the parallel light reflected by the reflective plate 309-1 can illuminate the chamfer 41 at the intersection gap from multiple angles. Then, part of the diffuse reflected light and the reflective plate 309-1 will illuminate the chamfer, and then enter the imaging range of the CCD camera 306 through the reflection effect of the chamfer, so that the brightness of the chamfer 41 at the intersection gap of the lens mold is enhanced, which enables the CCD camera 306 to find the intersection gap of the lens mold;

[0041] If the lens mold is a non-chamfered external mold, the light-blocking plate driving member drives the light-blocking plate 305 to move in a direction close to the light-emitting plate 309-2, so as to prevent the diffuse reflected light emitted by the light-emitting plate 309-2 from irradiating the non-chamfered external mold, and to prevent the diffuse reflected light from illuminating the entire circumferential surface of the lens mold, that is, only the parallel light reflected by the reflective plate 309-1 is irradiated on the circumferential surface of the lens mold. If part of the parallel light enters the inner groove 42, due to the concave structure, this part of the light will not be reflected within the imaging range of the CCD camera 306, that is, the inner groove 42 reflects the parallel light outside the imaging range of the CCD camera 306, so that the inner groove 42 and the resin around the inner groove 42 form a brightness difference, so that the inner groove 42 and the resin around the inner groove 42 will produce a brightness dividing line, and this brightness dividing line is the intersection gap of the lens mold. The light-blocking plate 305 can prevent the diffuse reflected light from illuminating the part with the brightness difference by preventing the diffuse reflected light from irradiating, so that the CCD camera 306 can capture the brightness dividing line with the brightness difference.

[0042] Specifically, in the present technical solution, the light-emitting board 309-2 adopts an LED light board. It should be noted that the light-blocking plate 305 cannot completely block the diffuse reflected light, but can only reduce the diffuse reflected light mixed with the parallel light to irradiate the outer peripheral surface of the lens module as much as possible, that is, to make the parallel light not mixed with diffuse reflected light as much as possible. Therefore, in the present technical solution, the inclination angle between the reflecting plate 309-1 and the light-emitting board 309-2 is 45 degrees, and the length ratio range of the reflecting plate 309-1 and the light-emitting board 309-2 is 1:1.4-1:1.45. The length of the light-emitting board 309-2 is 70-80 mm. When it is necessary to block the diffuse reflected light and only use parallel light to irradiate the junction gap of the lens mold, the light-blocking plate 305 rises 30-45 mm along the horizontal plane where the light-emitting board 309-2 is located.

[0043] The working principle and working process of the present invention are as follows:

[0044] The steps include:

[0045] S1: Positioning the lens mold and the camera assembly so that the center of the lens mold moves to the center of the field of view of the CCD camera 306 in the camera assembly;

[0046] When the lens mold is positioned, the light shielding plate 305 is located below the horizontal plane where the light emitting plate 309-2 is located, so that the diffuse reflected light emitted by the light emitting plate 309-2 and the parallel light reflected by the reflective plate 309-1 are both irradiated on the side (circumferential surface) of the mold, so that the light intensity between the edges of the B mold 101 and the A mold 105 in the lens mold is increased, which is convenient for the CCD camera 306 to accurately position, so that the intersection gap of the lens mold and the CCD camera 306 are close to the same axis;

[0047] S2: By judging whether the lens mold is a chamfered and exposed mold, the light shielding plate 305 is adjusted accordingly, and then the intersection gap of the lens mold is supplemented with light;

[0048] If the lens mold is a chamfered and exposed mold, the light-blocking plate driving member drives the light-blocking plate 305 to move in a direction away from the light-emitting plate 309-2 and to below the horizontal plane where the light-emitting plate 309-2 is located, so that the diffuse reflected light emitted by the light-emitting plate 309-2 and the parallel light reflected by the reflective plate 309-1 can illuminate the chamfer 41 at the intersection gap from multiple angles. Then, part of the diffuse reflected light and the reflective plate 309-1 will illuminate the chamfer, and then enter the imaging range of the CCD camera 306 through the reflection effect of the chamfer, so that the brightness of the chamfer 41 at the intersection gap of the lens mold is enhanced, which enables the CCD camera 306 to find the intersection gap of the lens mold;

[0049] If the lens mold is a non-chamfered exposed mold, the light-blocking plate driving member drives the light-blocking plate 305 to move in a direction close to the light-emitting plate 309-2, preventing the diffuse reflected light emitted by the light-emitting plate 309-2 from irradiating the non-chamfered exposed mold, and avoiding the diffuse reflected light from illuminating the entire circumferential surface of the lens mold, that is, only the parallel light reflected by the reflective plate 309-1 is irradiated on the circumferential surface of the lens mold. If part of the parallel light enters the inner groove 42, due to the concave structure, this part of the light will not be reflected within the imaging range of the CCD camera 306, that is, the inner The groove 42 reflects parallel light outside the imaging range of the CCD camera 306, so that a brightness difference is formed between the inner groove 42 and the resin around the inner groove 42, so that a brightness dividing line is formed between the inner groove 42 and the resin around the inner groove 42, and this brightness dividing line is the intersection gap of the lens mold. The light blocking plate 305 can prevent the diffuse reflected light from illuminating the part that produces the brightness difference by blocking the diffuse reflected light, so that the CCD camera 306 can capture the brightness dividing line that produces the brightness difference, that is, the intersection gap of the lens mold.

[0050] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.

Claims

1. A joint gap detection mechanism for lens molds, characterized in that: It includes a camera component and a fill light component, wherein the camera component is used to photograph the lens mold within the imaging range; The fill light assembly comprises a horizontally arranged light emitting plate (309-2) and an inclinedly arranged reflective plate (309-1), wherein the reflective plate (309-1) is used to reflect parallel light emitted by the light emitting plate (309-2) onto the lens mold, and the fill light assembly further comprises a light blocking plate (305), wherein the light blocking plate (305) is connected to a light blocking plate driving member, wherein the light blocking plate driving member is used to drive the light blocking plate (305) to move back and forth in the vertical direction of the light emitting plate (309-2) to prevent the light emitting plate (309-2) from ) emits diffuse reflected light onto the lens mold, the fill light component also includes an n-shaped mounting frame (309-3), the light-emitting plate (309-2) is horizontally mounted on the bottom open end of the n-shaped mounting frame (309-3), the reflective plate (309-1) is obliquely mounted on the top of the n-shaped mounting frame (309-3), the camera component is located on the first opening side of the through cavity of the n-shaped mounting frame (309-3), and the light blocking plate (305) is located on the second opening side of the through cavity of the n-shaped mounting frame (309-3).

2. A joint gap detection mechanism for lens molds according to claim 1, characterized in that: The inclined angle between the reflecting plate (309-1) and the light-emitting plate (309-2) is 45 degrees, the length ratio of the reflecting plate (309-1) to the light-emitting plate (309-2) is in the range of 1:1.4-1:1.45, the length of the light-emitting plate (309-2) is 70-80 millimeters, and when it is necessary to block diffusely reflected light and only use parallel light to illuminate the intersection gap of the lens mold, the light-blocking plate (305) rises to a height of 30-45 millimeters along the horizontal plane where the light-emitting plate (309-2) is located.

3. The joint gap detection mechanism for lens mold according to claim 2, characterized in that: The camera assembly is mounted on a servo lifter (304).

4. A method for detecting the joint gap of a lens mold, characterized in that: Using the joint gap detection mechanism described in any one of claims 1 to 3, the joint gap detection method comprises the following steps: S1: positioning the lens mold and the camera assembly so that the center of the lens mold moves to the center of the field of view of the CCD camera (306) in the camera assembly; S2: by judging whether the lens mold is a chamfered and exposed mold, the light shielding plate (305) is adjusted accordingly, thereby filling light at the joint gap of the lens mold; The chamfered and leaking mold is a lens mold that is concave relative to the A mold and the B mold after the resin is cured to form a chamfer (41), and vice versa, it is a non-chamfered and leaking mold, and the resin at the intersection gap of the non-chamfered and leaking mold forms an inner groove (42); If the lens mold is a chamfered and exposed mold, the light-blocking plate driving member drives the light-blocking plate (305) to move in a direction away from the light-emitting plate (309-2), so that the diffusely reflected light emitted by the light-emitting plate (309-2) and the parallel light reflected by the reflective plate (309-1) illuminate the chamfer (41) at the intersection gap from multiple angles, and then enter the imaging range of the CCD camera (306) through the reflection effect of the chamfer, thereby enhancing the brightness of the chamfer (41) at the intersection gap of the lens mold.

5. A method for detecting a joint gap of a lens mold according to claim 4, characterized in that: If the lens mold is a non-chamfered, exposed mold, the light-blocking plate driving member drives the light-blocking plate (305) to move in a direction close to the light-emitting plate (309-2), thereby preventing the diffusely reflected light emitted by the light-emitting plate (309-2) from irradiating the non-chamfered, exposed mold. The inner groove (42) reflects the parallel light outside the imaging range of the CCD camera (306), so that a brightness difference is formed between the inner groove (42) and the resin around the inner groove (42).

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