Multi-focus optical detection device

Abstract

The multi-focus optical detection device (100) includes a detection area (1), a detection light source (2) and a spectral lens (3) installed corresponding to the detection area (1), two cameras (4, 5) installed corresponding to the spectral lens (3), and an image processor (6) electrically connected to the two cameras (4, 5). The detection area (1) is for installing a contact lens (203), and the detection light source (2) can emit light (L) that passes through the contact lens (203). The spectral lens (3) is used to split the light so that it travels synchronously along two spectral paths (24, 25). The two cameras (4, 5) are located in the two spectral paths (24, 25), respectively, and are used to acquire two images (41, 51) by focusing on the central portion and the outer edge portion of the contact lens (203). The image processor (6) can receive the two images (41, 51) and further combine them to construct a detection image (61) covering the entire contact lens (203), thereby enabling the multi-focus optical detection device (100) to effectively improve detection capabilities using a high-resolution camera with a shallow depth of field.

Description

[Technical Field]

[0001] The present invention relates to a multi-focus optical detection device, and more particularly to a multi-focus optical detection device for detecting contact lenses. [Background technology]

[0002] Regarding the relative detection of contact lenses worn on a person's eye, conventional optical detection devices employ various detection mechanisms to enable more accurate relative detection of the contact lenses. For example, such detection mechanisms include phase contrast imaging or Schlieren photography. However, the detection mechanisms employed in conventional optical detection devices do not contribute to improving their own detection capabilities. Summary of the Invention [Problem to be solved by the invention]

[0003] Therefore, in view of the fact that the above-mentioned drawbacks can be improved, the inventors have conducted extensive research and examined scientific principles, and as a result, propose the present invention, which rationally and effectively improves the above-mentioned drawbacks. [Means for solving the problem]

[0004] SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-focus optical detection device that can effectively improve upon defects that may occur in conventional optical detection devices.

[0005] An embodiment of the present invention discloses a multi-focus optical detection device, the multi-focus optical detection device including a detection area for placing an object to be detected, the detection area including a transparent carrier, a liquid contained in the transparent carrier, and a contact lens immersed in the liquid, a detection light source capable of selectively emitting bright-field light or dark-field light toward the detection area to form a predetermined optical path passing through the object to be detected, a spectroscopic lens installed corresponding to the detection area and positioned on the predetermined optical path to split the light emitted from the detection light source so that the light travels synchronously along a first spectroscopic path and a second spectroscopic path, a first camera positioned on the first spectroscopic path and capable of focusing on a first predetermined portion of the contact lens to capture a first image corresponding to the contact lens, the first image being defined as a first bright-field image when the first camera receives the bright-field light and a first dark-field image when the first camera receives the dark-field light, and a second spectroscopic lens positioned on the second spectroscopic path and focusing on a second predetermined portion of the contact lens spaced apart from the first predetermined portion. In addition, the system includes a second camera capable of acquiring a second image corresponding to the contact lens, wherein when bright field light is received, the second image is defined as a second bright field image, and when dark field light is received, the second image is defined as a second dark field image; and an image processor electrically connected to the first camera and the second camera, wherein the image processor receives the first bright field image and the second bright field image and further combines them to form a bright field detection image covering the entire contact lens and displays M types of first defects on the contact lens, where M is a positive integer, and receives the first dark field image and the second dark field image and further combines them to form a dark field detection image covering the entire contact lens and displays N types of second defects on the contact lens, where N is a positive integer, and among the N types of second defects, N1 types of second defects are different from the M types of first defects, and N1 is a positive integer less than or equal to N.

[0006] Preferably, the first predetermined portion is a central portion of the contact lens and the depth of field of the first camera covers the optical area of ​​the contact lens.

[0007] Preferably, the second predetermined portion is the outer edge of the contact lens and the depth of field of the second camera covers the non-optical region of the contact lens surrounding the optical region.

[0008] Preferably, the depth of field of the first camera also covers part of the non-optical region, thereby partially overlapping with the depth of field of the second camera.

[0009] Preferably, the depth of field of the first camera partially overlaps with the depth of field of the second camera.

[0010] Preferably, of the N types of second defects, N2 types of second defects are the same as M types of first defects, N2 is a positive integer smaller than N, and N is greater than N1.

[0011] Preferably, the N1 type of second defects includes black foreign matter and white foreign matter located on the contact lens, and the N2 type of second defects includes hair fluff located on the contact lens.

[0012] Preferably, M is greater than or equal to 2N, and N is equal to the sum of N1 and N2.

[0013] An embodiment of the present invention discloses a multi-focus optical detection device, comprising: a detection area for placing an object to be detected, the detection area including 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 optical path passing through the object to be detected; a light splitting lens installed corresponding to the detection area and positioned on the predetermined optical path to split the light emitted from the detection light source so that the light travels synchronously along a first light splitting path and a second light splitting path; a first camera positioned on the first light splitting path and capable of focusing on an optical region of the contact lens to capture a first image corresponding to the contact lens; a second camera positioned on the second light splitting path and capable of focusing on a non-optical region of the contact lens to capture a second image corresponding to the contact lens; and an image processor electrically connected to the first and second cameras for receiving the first and second bright-field images and combining them to form a detection image.

[0014] Preferably, the contact lens includes an optical region and a non-optical region surrounding the optical region, the depth of field of the first camera covers the optical region and part of the non-optical region, the depth of field of the second camera covers the non-optical region, and the depth of field of the first camera partially overlaps with the depth of field of the second camera, and the image processor extracts the in-focus portion of the first image corresponding to the optical region, combines it with the in-focus portion of the second image corresponding to the non-optical region, and further synthesizes them to construct a detected image covering the entire contact lens.

[0015] As described above, in the multi-focal optical detection device disclosed in the embodiments of the present invention, the detection images (e.g., the bright-field detection image and the dark-field detection image) are formed by superimposing the images captured by the first camera and the second camera, each focusing on a different part of the contact lens. Therefore, it is not necessary to capture an image of the entire contact lens with only a single camera. As a result, the first camera and the second camera in the multi-focal optical detection device can each be a high-resolution camera with a shallow depth of field, which can effectively improve the detection capability (e.g., accuracy) of the multi-focal optical detection device.

[0016] Furthermore, the multi-focal optical detection device disclosed in the embodiments of the present invention can utilize the detection light source (e.g., the bright field light and the dark field light) to obtain the bright field detection image and the dark field detection image, which can complement each other for defect detection, and thus can effectively improve the detection efficiency of the multi-focal optical detection device.

[0017] In order to better understand the characteristics and technical contents of the present invention, reference is made to the detailed description and drawings relating to the present invention below. However, these descriptions and drawings are only for the purpose of explaining the present invention and do not limit the protection scope of the present invention in any way. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic diagram of a multi-focus optical detection device according to an embodiment of the present invention; [Figure 2] FIG. 2 is an enlarged schematic view of region II in FIG. [Figure 3] 2 is a schematic diagram of a first image generated during operation of a multi-focus optical detection device according to an embodiment of the present invention; FIG. [Figure 4] 4 is a schematic diagram of a second image generated during operation of the multi-focus optical detection device according to the embodiment of the present invention; FIG. [Figure 5] 3A and 3B are schematic diagrams of detected images generated during operation of a multi-focus optical detection device according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, specific examples will be used to describe embodiments of the "multi-focus optical detection device" disclosed in the present invention. Those skilled in the art will be able to understand the advantages and effects of the present invention from the disclosed content. The present invention can be implemented or applied through other different specific embodiments, and various detailed descriptions herein can be modified and changed in various ways based on different perspectives and applications without departing from the spirit of the present invention. It should be noted in advance that the drawings of the present invention are merely schematic and are not drawn to actual scale. The technical content of the present invention will be described in more detail using the following embodiments, but the disclosed content is not intended to limit the protection scope of the present invention.

[0020] In the specification, terms such as "first," "second," etc. may be used to describe various elements, but it should be understood that these elements should not be limited by these terms. These terms are primarily used to distinguish one element from another or one signal from another. Also, the term "or" in this specification should be understood to include any one or more combinations of the associated listed items, depending on the actual circumstances.

[0021] 1 to 5 show an embodiment of the present invention. As shown in Figures 1 and 2, this embodiment discloses a multi-focal optical detection device 100 for detecting defects that may exist in a contact lens 200. That is, any optical detection device that is not used to detect contact lenses is different from the multi-focal optical detection device 100 described in this embodiment.

[0022] The multi-focus optical detection device 100 includes a detection area 1, a detection light source 2 and a spectral lens 3 installed corresponding to the detection area 1, a first camera 4 and a second camera 5 installed corresponding to the spectral lens 3, and an image processor 6. Here, the detection area 1 may be a mounting table on which an object to be detected 200 is placed. It should be noted that the object to be detected 200 includes a transparent carrier 201 (e.g., a polypropylene cup), a liquid 202 contained in the transparent carrier 201, and a contact lens 203 immersed in the liquid 202.

[0023] The detection light source 2 and the spectral lens 3 are respectively installed on opposite sides of the detection area 1 (as shown in FIG. 1, the detection light source 2 is located below the detection area 1, and the spectral lens 3 is located above the detection area 1), and it is preferable that the outer surface of the contact lens 203 faces the detection light source 2, and the inner surface of the contact lens 203 faces the spectral lens 3, but the present invention is not limited thereto.

[0024] Furthermore, the detection light source 2 can emit light L toward the detection area 1 so as to form a predetermined optical path 23 that passes 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 board 21 and an annular light emitting body 22 located between the backlight board 21 and the detection area 1, and the object to be detected 200 is located on the central axis of the annular light emitting body 22, so that the light L is emitted in combination with the backlight board 21 and the annular light emitting body 22, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the detection light source 2 may adopt different light emitting members according to design needs.

[0025] The light splitting lens 3 is located on the predetermined optical path 23 and splits the light L emitted from the detection light source 2 so that the light L travels synchronously along a first light splitting path 24 and a second light splitting path 25. In this embodiment, a portion of the light L passes through the light splitting lens 3 and travels along the first light splitting path 24, and another portion of the light L is reflected by the light splitting lens 3 and travels along the second light splitting path 25.

[0026] The first camera 4 is positioned on the first spectral path 24 and receives the portion of the light L traveling along the first spectral path 24. The second camera 5 is positioned on the second spectral path 25 and receives the other portion of the light L traveling along the second spectral path 25. The image processor 6 is electrically connected to the first camera 4 and the second camera 5 and receives images captured by the first camera 4 and the second camera 5.

[0027] More specifically, as shown in FIGS. 1 to 5, the first camera 4 can focus on a first predetermined portion of the contact lens 203 to acquire a first image 41 (e.g., FIG. 3) corresponding to the contact lens 203. The second camera 5 can focus on a second predetermined portion of the contact lens 203 spaced apart from the first predetermined portion to acquire a second image 51 (e.g., FIG. 4) corresponding to the contact lens 203. The image processor 6 can receive the first image 41 and the second image 51 and further combine them to construct a detected image 61 (e.g., FIG. 5) covering the entire contact lens 203. It should be noted that the images shown in FIGS. 3 to 5 use a two-dot chain line to indicate a division line L2031 that defines the areas corresponding to the optical region 2031 and the non-optical region 2032.

[0028] As described above, the detection image 61 employed by the multi-focus optical detection device 100 in this embodiment is formed by superimposing images captured by the first camera 4 and the second camera 5, each focusing on a different portion of the contact lens 203. Therefore, it is not necessary to capture an image of the entire contact lens 203 using only a single camera. As a result, the first camera 4 and the second camera 5 in the multi-focus optical detection device 100 can each be a high-resolution camera with a shallow depth of field (DOF), which can effectively improve the detection capability (e.g., accuracy) of the multi-focus optical detection device 100.

[0029] In this embodiment, it is preferable that the depth of field 42 of the first camera 4 partially overlaps with the depth of field 52 of the second camera 5, so that the detected image 61 can accurately display the entire contact lens 203.

[0030] Here, the contact lens 203 includes an optical region 2031 and a non-optical region 2032 surrounding the optical region 2031. The contact lens 203 may have a function of correcting refractive error by the optical region 2031. For example, the refractive error may include, but is not limited to, hyperopia, myopia, astigmatism, or presbyopia. That is, the contact lens 203 may be a makeup lens without a corrective function.

[0031] Furthermore, the first predetermined portion is located in the optical region 2031 (e.g., the central portion of the contact lens 203), and the depth of field 42 of the first camera 4 covers the optical region 2031 and a portion of the non-optical region 2032. The second predetermined portion is located in the non-optical region 2032 (e.g., the outer edge portion of the contact lens 203), and the depth of field 52 of the second camera 5 covers the non-optical region 2032, so that the depth of field 42 of the first camera 4 partially overlaps with the depth of field 52 of the second camera 5, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the depth of field 42 of the first camera 4 may cover only the optical region 2031, and the depth of field 52 of the second camera 5 may cover only the non-optical region 2032.

[0032] As a result, 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 (for example, the portion surrounded by the dividing line L2031 in FIG. 3) and combine it with the in-focus portion 511 of the second image 51 corresponding to the non-optical region 2032 (for example, the portion outside the dividing line L2031 in FIG. 4). Further, the detected image 61 is constructed by combining the two. That is, the discarded portion 412 of the first image 41 corresponds to the non-optical region 2032, and the discarded portion 512 of the second image 51 corresponds to the optical region 2031.

[0033] In addition, in this embodiment, the multi-focus optical detection device 100 can further improve the detection efficiency of the multi-focus optical detection device 100 by utilizing the detection light source 2. More specifically, in this embodiment, the light L may be bright-field light or dark-field light. That is, the detection light source 2 can selectively emit the bright-field light or the dark-field light toward the detection area 1 to form the predetermined light path 23. In this embodiment, the detection light source 2 is used to emit the bright-field light or the dark-field light by combining the backlight board 21 with the annular light emitter 22, but the present invention is not limited thereto.

[0034] When the detection light source 2 emits the bright-field light, 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, so that the bright-field light is received by the first camera 4 and the second camera 5. The image processor 6 receives the first bright-field image and the second bright-field image, and further combines them to form a bright-field detection image, which displays M types of first defects of the contact lens 203, where M may be a positive integer. In other words, when the detection light source 2 emits the bright-field light, the detection image 61 is defined as the bright-field detection image.

[0035] When the detection light source 2 emits the dark field light to be received 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. Also, the image processor 6 receives and combines the first dark field image and the second dark field image to form a dark field detection image, which displays N types of second defects of the contact lens 203, where N may be a positive integer. In other words, when the detection light source 2 emits the dark field light, the detection image 61 is defined as the dark field detection image.

[0036] It should be noted that, among the N types of second defects, N1 types of second defects are different from the M types of first defects, where N1 is a positive integer less than or equal to N. Therefore, in this embodiment, the multifocal optical detection device 100 can acquire the bright-field detection image and the dark-field detection image, which are complementary to each other in defect detection, by utilizing the detection light source 2 (e.g., the bright-field light and the dark-field light), thereby effectively improving the detection efficiency of the multifocal optical detection device 100, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the detection light source 2 of the multifocal optical detection device 100 may employ only one of the bright-field light and the dark-field light.

[0037] In this embodiment, among the N types of second defects, N2 types of second defects are the same as the M types 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 equal to 12, and the M types of first defects include insufficient moisture, inside-out, deformation, lack of moisture, bubbles, chips, overlaps, edge cracks, splinters, dirt, rust, and hair fluff occurring on the contact lens 203.

[0038] The type of the first defect for which the bright-field detection image can be displayed does not vary depending on the type of the contact lens 203. On the other hand, the type of the second defect for which the dark-field detection image can be displayed may vary depending on the type of the contact lens 203.

[0039] For example, in the contact lens 203 (e.g., an aqua lens) without any pattern or design, the N1 types of second defects include black foreign matter and white foreign matter located on the contact lens 203, and the N2 types of second defects include hair fluff located on the contact lens 203. That is, since N1 is equal to 2 and N2 is equal to 1, N is equal to 3, and M is greater than 2N.

[0040] Furthermore, in the contact lens 203 having a colored pattern or design (e.g., a colored lens), the N1 types of second defects include black foreign matter and white foreign matter located on the contact lens 203, and the N2 types of second defects include hair and rust located on the contact lens 203, as well as edge cracks and fragments of the contact lens 203. That is, N1 is equal to 2 and N2 is equal to 4, so N is equal to 6 and M is equal to 2N.

[0041] Although the M types of first defects and the N types of second defects have been described above in this embodiment, the present invention is not limited thereto. That is, in other embodiments not shown in the present invention, the first defects and the second defects of the contact lens 203 can be adjusted and changed according to actual detection needs.

[0042] Beneficial Effects of the Examples As described above, in the multi-focal optical detection device disclosed in the embodiments of the present invention, the detection images (e.g., the bright-field detection image and the dark-field detection image) are formed by superimposing the images captured by the first camera and the second camera, each focusing on a different part of the contact lens. Therefore, it is not necessary to capture an image of the entire contact lens with only a single camera. As a result, the first camera and the second camera in the multi-focal optical detection device can each be a high-resolution camera with a shallow depth of field, which can effectively improve the detection capability (e.g., accuracy) of the multi-focal optical detection device.

[0043] Furthermore, the multi-focal optical detection device disclosed in the embodiments of the present invention can utilize the detection light source (e.g., the bright field light and the dark field light) to obtain the bright field detection image and the dark field detection image, which can complement each other for defect detection, and thus can effectively improve the detection efficiency of the multi-focal optical detection device.

[0044] The above disclosure is merely a preferred embodiment of the present invention and does not limit the scope of the claims of the present invention. Therefore, all equivalent technical modifications made using the specification and drawings of the present invention are included in the scope of the claims of the present invention.

Claims

1. a detection area for placing an object to be detected, the object including a transparent carrier, a liquid contained in the transparent carrier, and a contact lens immersed in the liquid; a detection light source capable of selectively emitting bright field light or dark field light toward the detection area to form a predetermined light path passing through the object to be detected; a spectral lens disposed in correspondence with the detection area and positioned on the predetermined optical path, for spectrally dividing the light emitted from the detection light source so that the light travels synchronously along a first spectral path and a second spectral path; a first camera located on the first light path, focused on a first predetermined portion of the contact lens, and capable of acquiring a first image corresponding to the contact lens, wherein the first image is defined as a first bright-field image when receiving the bright-field light, and the first image is defined as a first dark-field image when receiving the dark-field light; a second camera positioned on the second spectral path and capable of focusing on a second predetermined portion of the contact lens spaced apart from the first predetermined portion to acquire a second image corresponding to the contact lens, wherein the second image is defined as a second bright-field image when the bright-field light is received and a second dark-field image when the dark-field light is received; and an image processor electrically connected to the first camera and the second camera, the image processor receiving the first bright-field image and the second bright-field image and combining them to form a bright-field detection image covering the entire contact lens and displaying M types of first defects on the contact lens, where M is a positive integer; and the image processor receiving the first dark-field image and the second dark-field image and combining them to form a dark-field detection image covering the entire contact lens and displaying N types of second defects on the contact lens, where N is a positive integer; Equipped with Among the N types of second defects, N1 types of second defects are different from the M types of first defects, and N1 is a positive integer equal to or less than N. A multi-focus optical detection device characterized by:

2. the first predetermined portion is a central portion of the contact lens, and the depth of field of the first camera covers an optical region of the contact lens.

2. The multi-focus optical detection device according to claim 1.

3. the second predetermined portion is an outer edge portion of the contact lens, and the depth of field of the second camera covers a non-optical region of the contact lens surrounding the optical region.

3. A multi-focus optical detection device according to claim 2.

4. the depth of field of the first camera further covers a portion of the non-optical region, thereby partially overlapping with the depth of field of the second camera; 4. A multi-focus optical detection device according to claim 3.

5. The depth of field of the first camera partially overlaps with the depth of field of the second camera.

2. The multi-focus optical detection device according to claim 1.

6. Among the N types of second defects, N2 types of second defects are the same as the M types of first defects, N2 is a positive integer smaller than N, and N is larger than N1; 2. The multi-focus optical detection device according to claim 1.

7. The N1 type of second defects includes black foreign matter and white foreign matter located on the contact lens, and the N2 type of second defects includes hair fluff located on the contact lens.

7. A multi-focus optical detection device according to claim 6.

8. The M is equal to or greater than 2N, and the N is equal to the sum of N1 and N2.

7. A multi-focus optical detection device according to claim 6.

9. a detection area for placing an object to be detected, the object including 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 optical path passing through the object to be detected; a spectral lens disposed in correspondence with the detection area and positioned on the predetermined optical path, for spectrally dividing the light emitted from the detection light source so that the light travels synchronously along a first spectral path and a second spectral path; a first camera positioned in the first light path and capable of focusing on an optical region of the contact lens to capture a first image corresponding to the contact lens; a second camera positioned in the second spectral path and capable of focusing on a non-optical region of the contact lens to capture a second image corresponding to the contact lens; an image processor electrically connected to the first camera and the second camera, for receiving the first image and the second image and further combining them to form a detected image; Equipped with A multi-focus optical detection device characterized by:

10. the contact lens includes an optical region and a non-optical region surrounding the optical region, the depth of field of the first camera covers the optical region and a portion of the non-optical region, the depth of field of the second camera covers the non-optical region, and the depth of field of the first camera partially overlaps with the depth of field of the second camera, and the image processor extracts a focused portion of the first image corresponding to the optical region, combines it with a focused portion of the second image corresponding to the non-optical region, and further combines them to form the detected image covering the entire contact lens.

10. The multi-focus optical detection device according to claim 9.

Images