TWI873575B - Multi-focal optical detection apparatus - Google Patents

Abstract

The present invention provides a multi-focal optical detection apparatus, which includes a detection region, a detection light source and a beam splitter both corresponding in position to the detection region, two cameras corresponding in position to the beam splitter, and an image processor electrically coupled to the two cameras. The detection region is configured to provide a contact lens to be disposed thereon, and the detection light source is configured to emit a light beam to penetrate through the contact lens. The beam splitter is configured to guide the light beam to simultaneously travel along two splitting paths. The two cameras are respectively located at the two splitting paths, and are configured to respectively focus on a center portion and a peripheral portion of the contact lens for obtaining two images. The image processor is configured to receive the two images for merging the two images into a detection image that shows an entirety of the contact lens.

Description

Multi-focus optical testing equipment

The present invention relates to a multi-focal optical detection device, and more particularly to a multi-focal optical detection device for detecting contact lenses.

For the detection of contact lenses worn on human eyes, existing optical detection equipment adopts a variety of detection mechanisms to make the detection of contact lenses more accurate. For example, the above-mentioned detection mechanisms include phase contrast imaging or stencil photography. However, the detection mechanisms adopted by existing optical detection equipment do not help to improve their own detection capabilities.

Therefore, the inventors of the present invention believe that the above defects can be improved, and have conducted intensive research and applied scientific principles to finally propose the present invention which has a reasonable design and effectively improves the above defects.

The present invention provides a multi-focus optical detection device, which can effectively improve the defects that may occur in existing optical detection devices.

The present invention discloses a multi-focal optical detection device, which includes: a detection area for setting a test object; wherein the test object 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 passing through the test object; a splitter, which is set corresponding to the detection area and is located on the preset light path, so that the light emitted by the detection light source is split into two light rays along a first light path and a second light path along a second light path; A split light path and a second split light path 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, which is located on the second split light path, and the second camera The invention relates to a method for manufacturing a contact lens having a plurality of contact lenses and a plurality of contact lenses, wherein the first camera is configured to focus on a second preset position of the contact lens spaced 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; and when the second camera receives the dark field light, the second image is defined as a second dark field image; and an image processor, which is electrically coupled to the first camera and the second camera; wherein the image processor is configured to receive the first bright field image and the second bright field image. The image processor can receive the first dark field image and the second dark field image, and merge them into 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 merge them into 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; wherein N1 types of the N types of second defects are different from the M types of first defects, and N1 is a positive integer not greater than N.

The present invention also discloses a multi-focal optical detection device, which includes: a detection area for arranging an object to be detected; wherein the object to be detected 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 emit a light toward the detection area to form a preset light path passing through the object to be detected; a splitter, which is arranged corresponding to the detection area and is located on the preset light path, so that the light emitted by the detection light source is split into a first split light path and a second split light path that move synchronously; a first camera, which is located The invention relates to a method for detecting a first image of the contact lens having a plurality of surfaces, wherein the first image is located on the first light splitting 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 is located on the second light splitting 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 merge them into a detection image covering the entire contact lens.

In summary, the detection images (e.g., the bright field detection images and the dark field detection images) used in the multi-focal optical detection device disclosed in the embodiment of the present invention are formed by focusing the first camera and the second camera on different parts of the contact lens respectively and taking pictures and superimposing them, so it is not necessary to use only a single camera to obtain the image of the entire contact lens. Accordingly, the first camera and the second camera of the multi-focal optical detection device can each use a high-resolution camera with a smaller depth of field to effectively improve the detection capability of the multi-focal optical detection device (e.g., improve accuracy).

Furthermore, the multi-focal optical inspection device disclosed in the embodiment of the present invention can flexibly use the detection light source (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 performance of the multi-focal optical inspection device.

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.

The following is an explanation of the implementation of the "multi-focal optical detection equipment" disclosed in the present invention through specific concrete embodiments. Technical personnel in this field can understand the advantages and effects of the present invention from the contents disclosed in this manual. The present invention can be implemented or applied through other different specific embodiments, and the details in this manual can also be modified and changed in various ways based on different viewpoints and applications without deviating 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 sizes. Please note in advance. The following implementation will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

It should be understood that, although the terms "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or more combinations of the associated listed items depending on the actual situation.

Please refer to Figures 1 to 5, which are an embodiment of the present invention. As shown in Figures 1 and 2, this embodiment discloses a multi-focal optical detection device 100, which is limited to being used to detect possible defects of contact lenses 200; that is, any optical detection device not used to detect contact lenses is different from the multi-focal optical detection device 100 referred to in this embodiment.

The multi-focal optical detection device 100 includes a detection area 1, a detection light source 2 and a spectroscope 3 arranged corresponding to the detection area 1, a first camera 4 and a second camera 5 arranged corresponding to the spectroscope 3, and an image processor 6. The detection area 1 may be a carrier for placing an object to be detected 200; it should be noted that the object to be detected 200 includes a transparent carrier 201 (such as a polypropylene cup), a liquid 202 contained in the transparent carrier 201, and a contact lens 203 immersed in the liquid 202.

The detection light source 2 and the spectroscope 3 are respectively arranged on opposite sides of the detection area 1 (as shown in FIG. 1 , the detection light source 2 is located at the lower side of the detection area 1, and the spectroscope 3 is located at the upper side of the detection area 1), and the outer surface of the contact lens 203 preferably faces the detection light source 2, and the inner surface of the contact lens 203 faces the spectroscope 3, but the present invention is not limited thereto.

Furthermore, the detection light source 2 can emit a light L toward the detection area 1 to form a preset light path 23 passing through the object to be detected 200 (such as the contact lens 203). Furthermore, the detection light source 2 in this embodiment includes a backlight plate 21 and an annular light-emitting element 22 located between the backlight plate 21 and the detection area 1, and the object to be detected 200 is located at the central axis of the annular light-emitting element 22, so as to cooperate with each other to emit the light L, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the detection light source 2 can also use different light-emitting components according to design requirements.

The spectroscope 3 is located on the preset optical path 23, and is used to split the light L emitted by the detection light source 2 into a first spectroscope path 24 and a second spectroscope path 25 to move synchronously. In this embodiment, part of the light L passes through the spectroscope 3 and moves along the first spectroscope path 24, and another part of the light L is reflected by the spectroscope 3 and moves along the second spectroscope path 25.

The first camera 4 is located on the first splitting path 24, and is used to receive the portion of the light L traveling along the first splitting path 24; the second camera 5 is located on the second splitting path 25, and is used to receive the other portion of the light L traveling along the second splitting 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.

In more detail, as shown in FIGS. 1 to 5 , the first camera 4 can be used to focus on a first preset position of the contact lens 203 to obtain a first image 41 (e.g., FIG. 3 ) corresponding to the contact lens 203. The second camera 5 can be used to focus on a second preset position of the contact lens 203 spaced apart from the first preset position to obtain a second image 51 (e.g., FIG. 4 ) corresponding to the contact lens 203. Furthermore, the image processor 6 can be used to receive the first image 41 and the second image 51 and merge them into a detection 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-point chain to represent a dividing line L2031 for separating the portion corresponding to the optical area 2031 and the non-optical area 2032 .

As described above, the detection image 61 used by the multi-focus optical detection device 100 in this embodiment is formed by focusing the first camera 4 and the second camera 5 on different parts of the contact lens 203 respectively and taking pictures and superimposing them, so it is not necessary to use only a single camera to obtain the image of the entire contact lens 203. Accordingly, the first camera 4 and the second camera 5 of the multi-focus optical detection device 100 can each use a high-resolution camera with a small depth of field (DOF) to effectively improve the detection capability of the multi-focus optical detection device 100 (e.g., improve accuracy).

In this embodiment, the depth of field 42 of the first camera 4 preferably partially overlaps the depth of field 52 of the second camera 5, thereby ensuring that the detection image 61 can accurately present the entire contact lens 203.

The contact lens 203 includes an optical region 2031 and a non-optical region 2032 surrounding the optical region 2031, and the contact lens 203 can have a function of correcting refractive error through the optical region 2031. For example, the refractive error includes hyperopia, myopia, astigmatism, or presbyopia, but is not limited thereto; that is, the contact lens 203 can also be a makeup lens without a correction function.

Furthermore, the first preset position is located in the optical area 2031 (e.g., the central area of the contact lens 203), and the depth of field 42 of the first camera 4 covers the optical area 2031 and a part of the non-optical area 2032. The second preset position is located in the non-optical area 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 area 2032, so that the depth of field 42 of the first camera 4 and the depth 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 in the present invention, the depth of field 42 of the first camera 4 may only cover the optical area 2031 , while the depth of field 52 of the second camera 5 only covers the non-optical area 2032 .

Accordingly, the image processor 6 in this embodiment is used to capture the 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 ), to combine with the 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 then merge 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, and the discarded portion 512 of the second image 51 corresponds to the optical region 2031.

In addition, the multi-focal optical detection device 100 in this embodiment can also flexibly use the detection light source 2 to further improve the detection performance of the multi-focal optical detection device 100. In more detail, the light L in this embodiment can be a bright-field light or a 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 preset light path 23. In this embodiment, the detection light source 2 is the backlight panel 21 in combination with the annular light-emitting element 22 to emit the bright-field light or the dark-field light, but the present invention is not limited thereto.

When the detection light source 2 emits the bright field light for the first camera 4 and the second camera 5 to receive, 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 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, which presents M types of first defects of the contact lens 203, and M is 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.

In addition, when the detection light source 2 emits the dark field light for the first camera 4 and the second camera 5 to receive, 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 be used to receive the first dark field image and the second dark field image, and merge them into a dark field detection image, which presents N types of second defects of the contact lens 203, and N is 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.

It should be noted that N1 types of the second defects among the N types are different from the first defects of the M types, and N1 is a positive integer not greater than N. Accordingly, the multi-focal optical detection device 100 in this embodiment can flexibly use the detection light source 2 (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 performance of the multi-focal 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 multi-focal optical detection device 100 can also use only one of the bright field light and the dark field light.

In this embodiment, N2 types of the second defects of N types are the same as the first defects of M types, N2 is a positive integer less than N, and 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 first defects of M types include water shortage, reverse surface, deformation, no water, air bubble, missing piece, overlapping piece, edge crack, broken piece, dirt, rust spot, and hair dandruff occurring in the contact lens 203.

It should be further explained that the type of the first defect that can be presented by the bright field detection image does not differ due to the different types of the contact lenses 203; however, the type of the second defect that can be presented by the dark field detection image does differ due to the different types of the contact lenses 203.

For example, in the contact lens 203 (such as aquamarine lens) without any pattern or pattern, the second defect of type N1 includes black foreign matter and white foreign matter on the contact lens 203, and the second defect of type N2 includes dandruff on the contact lens 203; that is, N1 is equal to 2, N2 is equal to 1, so N is equal to 3, and M is greater than 2N.

Furthermore, in the contact lens 203 (e.g., colored lenses) formed with colored patterns or patterns, the second defects of type N1 include black foreign matter and white foreign matter on the contact lens 203, and the second defects of type N2 include dandruff and rust spots on the contact lens 203, and edge cracks and broken pieces of the contact lens 203; that is, N1 is equal to 2, N2 is equal to 4, so N is equal to 6, and M is equal to 2N.

In addition, although the M types of the first defects and the N types of the second defects are described in the above content in this embodiment, the present invention is not limited thereto. That is to say, 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 requirements.

[Technical Effects of the Embodiments of the Invention]

In summary, the detection images (e.g., the bright field detection images and the dark field detection images) used in the multi-focal optical detection device disclosed in the embodiment of the present invention are formed by focusing the first camera and the second camera on different parts of the contact lens respectively and taking pictures and superimposing them, so it is not necessary to use only a single camera to obtain the image of the entire contact lens. Accordingly, the first camera and the second camera of the multi-focal optical detection device can each use a high-resolution camera with a smaller depth of field to effectively improve the detection capability of the multi-focal optical detection device (e.g., improve accuracy).

Furthermore, the multi-focal optical inspection device disclosed in the embodiment of the present invention can flexibly use the detection light source (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 performance of the multi-focal optical inspection device.

The above disclosed contents are only preferred feasible embodiments of the present invention and are not intended to limit the patent scope of the present invention. Therefore, all equivalent technical changes made using the contents of the specification and drawings of the present invention are included in the patent scope of the present invention.

100: Multi-focus optical testing equipment 1: Testing area 2: Testing light source 21: Backlight 22: Ring light emitting element 23: Default optical path 24: First splitting path 25: Second splitting path 3: Spectroscope 4: First camera 41: First image 411: Focusing area 412: Discarding area 42: Depth of field 5: Second camera 51: Second image 511: Focusing area 512: Discarding area 52: Depth of field 6: Image processor 61: Testing image 200: Object to be tested 201: Transparent carrier 202: Liquid 203: Contact lens 2031: Optical area 2032: Non-optical area L: Light line L2031: Dividing line

FIG1 is a schematic diagram of a multi-focus optical detection device according to an embodiment of the present invention.

FIG. 2 is an enlarged schematic diagram of region II of FIG. 1 .

FIG. 3 is a schematic diagram of a first image generated by the multi-focus optical detection device of an embodiment of the present invention during operation.

FIG. 4 is a schematic diagram of a second image generated by the multi-focus optical detection device of an embodiment of the present invention during operation.

FIG5 is a schematic diagram of a detection image generated by the multi-focus optical detection device of an embodiment of the present invention during operation.

100: Multi-focal optical testing equipment

1: Testing area

2: Detection light source

21: Backlight panel

22: Ring light emitting element

23: Default light path

24: First splitting path

25: Second splitting path

3: Spectroscope

4: First camera

5: Second camera

6: Image processor

200: Object to be tested

201: Transparent vehicle

202:Liquid

203:Contact lenses

L: Light

Claims (8)

A multi-focal optical detection device, comprising: A detection area for setting a test object; wherein the test object 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 test object; A spectroscope, which is set corresponding to the detection area and located on the preset light path, so as to split the light emitted by the detection light source into a first split light path and a second split light 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, the first preset position is the central position of the contact lens, and the depth of field of the first camera covers an optical area of the contact lens to obtain a first image corresponding to the contact lens, but the first camera does not need to obtain the image of the entire 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, which is 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 from the first preset position, the second preset position is the 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, so as to obtain a second image corresponding to the contact lens, but the second camera does not need to obtain the image of the entire 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 merge them into a bright field detection image covering the entire contact lens, which presents M types of first defects of the contact lens, 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 merge them into a dark field detection image covering the entire contact lens, which presents N types of second defects of the contact lens, N is a positive integer; wherein N1 types of the N types of second defects are different from the M types of first defects, N1 is a positive integer not greater than N. A multi-focus optical detection device as described in claim 1, wherein 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. A multi-focus optical detection device as described in claim 1, wherein the depth of field of the first camera partially overlaps with the depth of field of the second camera. A multi-focus optical inspection device as described in claim 1, wherein 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. A multi-focal optical inspection device as described in claim 4, wherein the second defect of type N1 includes black foreign matter and white foreign matter located on the contact lens, and the second defect of type N2 includes dandruff located on the contact lens. A multi-focus optical inspection device as described in claim 4, wherein M is greater than or equal to 2N, and N is equal to the sum of N1 and N2. A multi-focal optical detection device, comprising: A detection area, which is used to place 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 emit a light toward the detection area to form a preset light path passing through the object to be tested; A spectroscope, which is set corresponding to the detection area and located on the preset light path, so that the light emitted by the detection light source is split into a first split light path and a second split light path that move synchronously; A first camera, which is 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, but the first camera does not need to obtain the image of the entire contact lens; A second camera, which is 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, but the second camera does not need to obtain the image of the entire contact lens; 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 image and the second image and merge them into a detection image. A multi-focal optical detection device as described in claim 7, wherein 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 capture 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.