Multi-focal optical detection equipment
Patent Information
- Application Number
- CN202380053399.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-03-24
- Publication Date
- 2025-02-28
AI Technical Summary
Existing optical inspection equipment lacks effective means to improve its own inspection capabilities when inspecting contact lenses, and cannot accurately detect defects in the entire contact lens.
Using multi-focal optical detection equipment, the detection light is divided into two paths through a spectroscope. The first and second cameras focus on the optical area and non-optical area of the contact lens respectively. The image processor merges the two images to form a complete Inspect images and use bright field and dark field light for defect detection.
It improves the accuracy and efficiency of the testing equipment, can effectively detect various defects of contact lenses, and improves the testing capabilities.
Smart Images
Figure CN119546934A_ABST
Abstract
Description
Multi-focal optical inspection equipment Technical Field
[0001] The present invention relates to a multifocal optical detection device, in particular to a multifocal optical detection device for detecting contact lenses. Background Art
[0002] Existing optical inspection equipment utilizes various detection mechanisms to improve the accuracy of contact lens testing. Examples include phase contrast imaging and Schlieren photography. However, these mechanisms do not improve the inspection capabilities of existing optical inspection equipment.
[0003] Therefore, the inventors believe that the above defects can be improved, and have devoted themselves to research and applied scientific principles to finally propose the present invention which has a reasonable design and effectively improves the above defects.
[0004] Summary of the Invention
[0005] An object of the embodiments of the present invention is to provide a multi-focus optical inspection device, which can effectively improve the defects that may occur in existing optical inspection devices.
[0006] An embodiment of the present invention discloses a multi-focal optical detection device, which includes: a detection area, which is used to set up an object to be tested; wherein the object to be tested includes a transparent carrier, a liquid contained in the transparent carrier and a contact lens immersed in the liquid; a detection light source, which can selectively emit a bright field light or a dark field light toward the detection area to form a preset light path through the object to be tested; a spectroscope, which is set corresponding to the detection area and is located on the preset light path, so as to split the light emitted by the detection light source into a first spectroscopic path and a second spectroscopic path that travel synchronously; a first camera, which is located on the first spectroscopic path, and the first camera can be used to focus on a first preset position of the contact lens to obtain a first image of the corresponding contact lens; wherein, when the first camera receives bright field light, the first image is defined as a first bright field image; when the first camera receives dark field light, the first image is defined as a first dark field image; a second camera, which is located on the second spectroscopic path, and the first camera can be used to focus on a first preset position of the contact lens to obtain a first image of the corresponding contact lens; Two cameras are configured to focus on a second predetermined portion of the contact lens spaced apart from the first predetermined portion to obtain a second image corresponding to the contact lens. When the second camera receives brightfield light, the second image is defined as a second brightfield image. When the second camera receives darkfield light, the second image is defined as a second darkfield image. An image processor is electrically coupled to the first camera and the second camera. The image processor receives the first brightfield image and the second brightfield image and combines them to form a brightfield inspection image covering the entire contact lens, representing M types of first defects of the contact lens, where M is a positive integer. The image processor receives the first darkfield image and the second darkfield image and combines them to form a darkfield inspection image covering the entire contact lens, representing N types of second defects of the contact lens, where N is a positive integer. Among the N types of second defects, N1 types are different from the M types of first defects, where N1 is a positive integer not greater than N.
[0007] Preferably, the first preset position is a central portion of the contact lens, and the depth of field of the first camera covers an optical area of the contact lens.
[0008] Preferably, the second predetermined location is an outer edge of the contact lens, and the depth of field of the second camera covers a non-optical area of the contact lens surrounding the optical area.
[0009] Preferably, the depth of field of the first camera further covers a portion of the non-optical area, thereby partially overlapping with the depth of field of the second camera.
[0010] Preferably, the depth of field of the first camera partially overlaps with the depth of field of the second camera.
[0011] Preferably, N2 types of the second defects among the N types of defects are the same as the M types of first defects, N2 is a positive integer less than N, and N is greater than N1.
[0012] Preferably, the N1 type of second defects include black foreign matter and white foreign matter on the contact lens, and the N2 type of second defects include dandruff on the contact lens.
[0013] Preferably, M is greater than or equal to 2N, and N is equal to the sum of N1 and N2.
[0014] The present invention also discloses a multi-focal optical inspection device comprising: a detection area for arranging an object to be tested; wherein the object to be tested comprises a transparent carrier, a liquid contained in the transparent carrier, and a contact lens immersed in the liquid; a detection light source capable of emitting light toward the detection area to form a predetermined light path through the object to be tested; a beam splitter disposed corresponding to the detection area and located on the predetermined light path to split the light emitted by the detection light source into light beams that travel synchronously along a first split light path and a second split light path; A first camera is located on a first light splitting path and can be used to focus on an optical area of a contact lens to obtain a first image corresponding to the contact lens; a second camera is located on a second light splitting path and can be used to focus on a non-optical area of the contact lens to obtain a second image corresponding to the contact lens; and an image processor is electrically coupled to the first camera and the second camera; wherein the image processor can be used to receive the first image and the second image and combine them to form a detection image.
[0015] Preferably, the contact lens includes an optical area and a non-optical area surrounding the optical area; the depth of field of the first camera covers the optical area and a partial non-optical area, the depth of field of the second camera covers the non-optical area, and the depth of field of the first camera and the depth of field of the second camera partially overlap; wherein the image processor is used to extract the focus portion of the first image corresponding to the optical area, combine it with the focus portion of the second image corresponding to the non-optical area, and then merge to form a detection image covering the entire contact lens.
[0016] In summary, the detection images (e.g., the brightfield detection image and the darkfield detection image) used by the multifocal optical inspection device disclosed in the embodiments of the present invention are formed by superimposing the images captured by the first and second cameras, each focusing on different parts of the contact lens. This eliminates the need for a single camera to capture an image of the entire contact lens. Accordingly, the first and second cameras of the multifocal optical inspection device can each utilize a high-resolution camera with a smaller depth of field, effectively improving the detection capabilities (e.g., improving accuracy) of the multifocal optical inspection device.
[0017] Furthermore, the multi-focal optical inspection device disclosed in the embodiment of the present invention can flexibly utilize the detection light source (such as: using the bright field light and the dark field light) to obtain the bright field detection image and the dark field detection image that can complement each other for defect detection, thereby effectively improving the detection efficiency of the multi-focal optical inspection device.
[0018] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, such description and drawings are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG1 is a schematic diagram of a multi-focus optical detection device according to an embodiment of the present invention.
[0020] FIG. 2 is an enlarged schematic diagram of region II in FIG. 1 .
[0021] FIG. 3 is a schematic diagram of a first image generated by the multi-focus optical inspection device during operation according to an embodiment of the present invention.
[0022] FIG. 4 is a schematic diagram of a second image generated by the multi-focus optical inspection device during operation according to an embodiment of the present invention.
[0023] FIG. 5 is a schematic diagram of an inspection image generated by the multi-focus optical inspection device during operation according to an embodiment of the present invention. DETAILED DESCRIPTION
[0024] The following is an explanation of the implementation of the "multi-focal optical detection device" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following embodiments will further explain the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention.
[0025] It should be understood that although terms such as "first," "second," and "third" may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. In addition, the term "or" as used herein may include any one or more combinations of the associated listed items, as appropriate.
[0026] Please refer to Figures 1 through 5 , which illustrate an embodiment of the present invention. As shown in Figures 1 and 2 , this embodiment discloses a multifocal optical inspection device 100 specifically designed for inspecting contact lenses 200 for potential defects. In other words, any optical inspection device not designed for inspecting contact lenses is not considered multifocal optical inspection device 100 in this embodiment.
[0027] The multi-focal optical inspection apparatus 100 includes an inspection area 1, a detection light source 2 and a spectroscope 3 corresponding to the inspection area 1, a first camera 4 and a second camera 5 corresponding to the spectroscope 3, and an image processor 6. The inspection area 1 may be a stage on which an object to be inspected 200 is placed. The object to be inspected 200 includes a transparent carrier 201 (e.g., a polypropylene cup), a liquid 202 contained within the transparent carrier 201, and a contact lens 203 immersed in the liquid 202.
[0028] The detection light source 2 and the spectrometer 3 are respectively arranged on opposite sides of the detection area 1 (as shown in Figure 1, the detection light source 2 is located on the lower side of the detection area 1, and the spectrometer 3 is located on the upper side of the detection area 1), and the outer surface of the contact lens 203 is preferably facing the detection light source 2, and the inner surface of the contact lens 203 is facing the spectrometer 3, but the present invention is not limited to this.
[0029] Specifically, the detection light source 2 can emit a light L toward the detection area 1 to form a predetermined light path 23 through the object to be detected 200 (e.g., the contact lens 203). Furthermore, in this embodiment, the detection light source 2 includes a backlight panel 21 and an annular light-emitting element 22 located between the backlight panel 21 and the detection area 1, and the object to be detected 200 is located on the central axis of the annular light-emitting element 22, so that the light L is emitted in conjunction with each other. However, the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the detection light source 2 may also employ different light-emitting components based on design requirements.
[0030] The beam splitter 3 is positioned on the predetermined optical path 23 and is configured to split the light L emitted by the detection light source 2 into two beams that travel simultaneously along a first beam splitting path 24 and a second beam splitting path 25. In this embodiment, a portion of the light L passes through the beam splitter 3 and travels along the first beam splitting path 24, while another portion of the light L is reflected by the beam splitter 3 and travels along the second beam splitting path 25.
[0031] The first camera 4 is located on the first spectroscopic path 24, and is used to receive the portion of the light L traveling along the first spectroscopic path 24; the second camera 5 is located on the second spectroscopic path 25, and is used to receive the other portion of the light L traveling along the second spectroscopic path 25; the image processor 6 is electrically coupled to the first camera 4 and the second camera 5, and is used to receive the images obtained by the first camera 4 and the second camera 5.
[0032] More specifically, as shown in Figures 1 to 5 , the first camera 4 can be used to focus on a first predetermined portion of the contact lens 203 to obtain a first image 41 corresponding to the contact lens 203 (e.g., Figure 3 ). The second camera 5 can be used to focus on a second predetermined portion of the contact lens 203 spaced apart from the first predetermined portion to obtain a second image 51 corresponding to the contact lens 203 (e.g., Figure 4 ). Furthermore, the image processor 6 can receive the first image 41 and the second image 51 and combine them to form a detection image 61 covering the entire contact lens 203 (e.g., Figure 5 ). It should be noted that the images shown in Figures 3 to 5 use a two-dot chain line to represent a dividing line L2031, which is used to separate the portion corresponding to the optical zone 2031 from the non-optical zone 2032.
[0033] As described above, the inspection image 61 used by the multi-focal optical inspection device 100 in this embodiment is formed by superimposing images captured by the first camera 4 and the second camera 5, each focusing on different parts of the contact lens 203. This eliminates the need for a single camera to capture an image of the entire contact lens 203. Accordingly, the first camera 4 and the second camera 5 of the multi-focal optical inspection device 100 can each utilize a high-resolution camera with a small depth of field (DOF), effectively improving the inspection capability (e.g., improving accuracy) of the multi-focal optical inspection device 100.
[0034] In this embodiment, the depth of field 42 of the first camera 4 preferably partially overlaps with the depth of field 52 of the second camera 5 , so as to ensure that the detection image 61 can accurately present the entire contact lens 203 .
[0035] The contact lens 203 includes an optical zone 2031 and a non-optical zone 2032 surrounding the optical zone 2031. The contact lens 203 can correct refractive errors through the optical zone 2031. For example, the refractive errors include hyperopia, myopia, astigmatism, or presbyopia, but are not limited thereto. In other words, the contact lens 203 can also be a makeup lens without a corrective function.
[0036] Furthermore, the first predetermined location is located in the optical zone 2031 (e.g., the center of the contact lens 203), and the depth of field 42 of the first camera 4 covers the optical zone 2031 and a portion of the non-optical zone 2032. The second predetermined location is located in the non-optical zone 2032 (e.g., the outer edge of the contact lens 203), and the depth of field 52 of the second camera 5 covers the non-optical zone 2032. Consequently, the depths of field 42 of the first camera 4 and the depths of field 52 of the second camera 5 partially overlap, but the present invention is not limited thereto. For example, in other embodiments not shown, the depth of field 42 of the first camera 4 may cover only the optical zone 2031, while the depth of field 52 of the second camera 5 may cover only the non-optical zone 2032.
[0037] Accordingly, in this embodiment, the image processor 6 is used to extract the in-focus portion 411 of the first image 41 corresponding to the optical region 2031 (e.g., the portion surrounded by the dividing line L2031 in FIG. 3 ), combine it with the in-focus portion 511 of the second image 51 corresponding to the non-optical region 2032 (e.g., the portion outside the dividing line L2031 in FIG. 4 ), and thereby combine them to form the detection image 61. In other words, the discarded portion 412 of the first image 41 corresponds to the non-optical region 2032, while the discarded portion 512 of the second image 51 corresponds to the optical region 2031.
[0038] Furthermore, the multi-focal optical inspection device 100 in this embodiment can also further enhance the inspection performance of the multi-focal optical inspection device 100 by flexibly utilizing the inspection light source 2. More specifically, the light L in this embodiment can be a bright-field light or a dark-field light; that is, the inspection light source 2 can selectively emit the bright-field light or the dark-field light toward the inspection area 1 to form the predetermined light path 23. In this embodiment, the inspection light source 2 is configured to emit the bright-field light or the dark-field light by combining the backlight panel 21 with the annular light-emitting element 22, but the present invention is not limited thereto.
[0039] When the detection light source 2 emits the bright field light for reception by the first camera 4 and the second camera 5, the first image 41 is defined as a first bright field image, and the second image 51 is defined as a second bright field image. Furthermore, the image processor 6 is configured to receive the first and second bright field images and combine them to form a bright field detection image representing M types of first defects of the contact lens 203, where M is a positive integer. Stated another way, when the detection light source 2 emits the bright field light, the detection image 61 is defined as the bright field detection image.
[0040] Furthermore, when the detection light source 2 emits the dark-field light for reception by the first camera 4 and the second camera 5, the first image 41 is defined as a first dark-field image, and the second image 51 is defined as a second dark-field image. Furthermore, the image processor 6 can receive the first dark-field image and the second dark-field image and combine them to form a dark-field detection image representing N types of second defects of the contact lens 203, where N is a positive integer. Stated another way, when the detection light source 2 emits the dark-field light, the detection image 61 is defined as the dark-field detection image.
[0041] It should be noted that N1 of the N categories of the second defects are different from the M categories of the first defects, and N1 is a positive integer not greater than N. Accordingly, in this embodiment, the multi-focal optical inspection device 100 can flexibly utilize the detection light source 2 (e.g., using the bright field light and the dark field light) to obtain the bright field detection image and the dark field detection image that can complement each other for defect detection, thereby effectively improving the detection efficiency of the multi-focal optical inspection device 100, but the present invention is not limited to this. For example, in other embodiments not shown in the present invention, the detection light source 2 of the multi-focal optical inspection device 100 can also use only one of the bright field light and the dark field light.
[0042] In this embodiment, N2 of the N categories of second defects are the same as the M categories of first defects, where N2 is a positive integer less than N, N is greater than N1, and N is equal to the sum of N1 and N2. For example, M is 12, and the M categories of first defects include water deficiency, reversed surface, deformation, absence of water, air bubbles, missing lens, overlapped lens, edge cracks, broken lens, dirt, rust, and hair dander on the contact lens 203.
[0043] It should be noted that the type of the first defect that can be presented by the bright field detection image does not vary depending on the type of the contact lens 203; however, the type of the second defect that can be presented by the dark field detection image does vary depending on the type of the contact lens 203.
[0044] For example, in the contact lens 203 without any lines or patterns (e.g., a water-blue lens), the second defects of category N1 include black foreign matter and white foreign matter on the contact lens 203, and the second defects of category N2 include dandruff on the contact lens 203; that is, N1 equals 2, N2 equals 1, so N equals 3, and M is greater than 2N.
[0045] Furthermore, in the contact lens 203 formed with colored lines or patterns (e.g., colored lenses), the second defects of category N1 include black foreign matter and white foreign matter located on the contact lens 203, and the second defects of category N2 include dander and rust spots located on the contact lens 203 and cracks and broken pieces of the contact lens 203; that is, N1 equals 2, N2 equals 4, so N equals 6, and M equals 2N.
[0046] Furthermore, while the M types of first defects and N types of second defects are described above in this embodiment, the present invention is not limited thereto. In other embodiments not shown, the first defects and second defects of the contact lens 203 can be adjusted and varied based on actual inspection requirements.
[0047] [Technical Effects of the Embodiments of the Invention]
[0048] In summary, the detection images (e.g., the brightfield detection image and the darkfield detection image) used by the multifocal optical inspection device disclosed in the embodiments of the present invention are formed by superimposing the images captured by the first and second cameras, each focusing on different parts of the contact lens. This eliminates the need for a single camera to capture an image of the entire contact lens. Accordingly, the first and second cameras of the multifocal optical inspection device can each utilize a high-resolution camera with a smaller depth of field, effectively improving the detection capabilities (e.g., improving accuracy) of the multifocal optical inspection device.
[0049] Furthermore, the multi-focal optical inspection device disclosed in the embodiment of the present invention can flexibly utilize the detection light source (such as: using the bright field light and the dark field light) to obtain the bright field detection image and the dark field detection image that can complement each other for defect detection, thereby effectively improving the detection efficiency of the multi-focal optical inspection device.
[0050] The contents disclosed above are only preferred feasible embodiments of the present invention and do not limit the patent scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention description and drawings are included in the patent scope of the present invention.
Claims
1. A multi-focal optical detection device, characterized in that: The multi-focus optical detection device comprises: A detection area for arranging an object to be detected; wherein the object to be detected comprises a transparent carrier, a liquid contained in the transparent carrier, and a contact lens immersed in the liquid; A detection light source, which can selectively emit a bright field light or a dark field light toward the detection area to form a preset light path passing through the object to be detected; A beam splitter, which is arranged corresponding to the detection area and located on the preset light path, and is used to split the light emitted by the detection light source into a first beam splitting path and a second beam splitting path to move synchronously; a first camera, which is located on the first split light path, and the first camera can be used to focus on a first preset position of the contact lens to obtain a first image corresponding to the contact lens; wherein, when the first camera receives the bright field light, the first image is defined as a first bright field image; when the first camera receives the dark field light, the first image is defined as a first dark field image; a second camera located on the second split light path, and the second camera can be used to focus on a second preset position of the contact lens spaced apart from the first preset position to obtain a second image corresponding to the contact lens; wherein when the second camera receives the bright field light, the second image is defined as a second bright field image; when the second camera receives the dark field light, the second image is defined as a second dark field image; and an image processor electrically coupled to the first camera and the second camera; wherein the image processor can be used to receive the first bright field image and the second bright field image, and combine them to form a bright field detection image covering the entire contact lens, which presents M types of first defects of the contact lens, where M is a positive integer; wherein the image processor can be used to receive the first dark field image and the second dark field image, and combine them to form a dark field detection image covering the entire contact lens, which presents N types of second defects of the contact lens, where N is a positive integer; Among them, N1 types of the second defects of N types are different from the first defects of M types, and N1 is a positive integer not greater than N.
2. The multi-focus optical detection device according to claim 1, characterized in that: The first preset position is a central position of the contact lens, and the depth of field of the first camera covers an optical area of the contact lens.
3. The multi-focus optical detection device according to claim 2, characterized in that: The second preset position is an outer edge of the contact lens, and the depth of field of the second camera covers a non-optical area of the contact lens surrounding the optical area.
4. The multi-focus optical detection device according to claim 3, characterized in that: The depth of field of the first camera further covers a portion of the non-optical area, thus partially overlapping with the depth of field of the second camera.
5. The multi-focus optical detection device according to claim 1, characterized in that: The depth of field of the first camera partially overlaps with the depth of field of the second camera.
6. The multi-focus optical detection device according to claim 1, characterized in that: N2 types of the N types of the second defects are the same as the M types of the first defects, N2 is a positive integer less than N, and N is greater than N1.
7. The multi-focus optical detection device according to claim 6, characterized in that: The second defects of the N1 category include black foreign matter and white foreign matter on the contact lens, and the second defects of the N2 category include dandruff on the contact lens.
8. The multi-focus optical detection device according to claim 6, characterized in that: M is greater than or equal to 2N, and N is equal to the sum of N1 and N2.
9. A multi-focus optical detection device, characterized in that: The multi-focus optical detection device comprises: A detection area for arranging an object to be detected; wherein the object to be detected comprises a transparent carrier, a liquid contained in the transparent carrier, and a contact lens immersed in the liquid; A detection light source, which can emit a light toward the detection area to form a preset light path passing through the object to be detected; A beam splitter, which is arranged corresponding to the detection area and located on the preset light path, and is used to split the light emitted by the detection light source into a first beam splitting path and a second beam splitting path to move synchronously; a first camera located on the first split light path, and the first camera can be used to focus on the optical area of the contact lens to obtain a first image corresponding to the contact lens; a second camera located on the second split light path, and the second camera can be used to focus on the non-optical area of the contact lens to obtain a second image corresponding to the contact lens; and An image processor is electrically coupled to the first camera and the second camera; wherein the image processor can be used to receive the first image and the second image and combine them into a detection image.
10. The multi-focus optical detection device according to claim 9, characterized in that: The contact lens includes an optical area and a non-optical area surrounding the optical area; the depth of field of the first camera covers the optical area and a part of the non-optical area, the depth of field of the second camera covers the non-optical area, and the depth of field of the first camera and the depth of field of the second camera partially overlap; wherein the image processor is used to extract the focus portion of the first image corresponding to the optical area, to combine it with the focus portion of the second image corresponding to the non-optical area, and then merge to form the detection image covering the entire contact lens.