KR101817695B1 - Method and apparatus for inspecting ophthalmic lens - Google Patents

Method and apparatus for inspecting ophthalmic lens Download PDF

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KR101817695B1
KR101817695B1 KR1020127020552A KR20127020552A KR101817695B1 KR 101817695 B1 KR101817695 B1 KR 101817695B1 KR 1020127020552 A KR1020127020552 A KR 1020127020552A KR 20127020552 A KR20127020552 A KR 20127020552A KR 101817695 B1 KR101817695 B1 KR 101817695B1
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South Korea
Prior art keywords
contact lens
optical imaging
imaging system
channel
image
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KR1020127020552A
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Korean (ko)
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KR20120129902A (en
Inventor
빅토르 베르토프라크호브
순 웨이 웡
티안 포 유
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비전익스트림 피티이 엘티디
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
    • G01M11/0278—Detecting defects of the object to be tested, e.g. scratches or dust
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0207—Details of measuring devices
    • G01M11/0214—Details of devices holding the object to be tested
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • G01N2021/9583—Lenses

Abstract

A system and method for contact lens inspection is provided. The illumination system illuminates the central zone and the peripheral zone of the contact lens when the contact lens is in the cavity between the male mold and the female mold. The optical imaging system has two channels for capturing two images or a single composite image for examining the entire contact lens. The optical imaging system of the first channel has an entrance pupil distant from the mold. The camera of the first channel is used to capture an image of the central region of the contact lens. The optical imaging system of the second channel is disposed outside the mold, but the entrance pupil is disposed inside or outside the mold, but is disposed substantially close to the mold. Whereby the camera of the second channel can capture the image of the peripheral region of the contact lens.

Figure 112012062365818-pct00009

Description

TECHNICAL FIELD [0001] The present invention relates to a method and an apparatus for inspecting an ophthalmic lens,

The present invention relates to ophthalmic lenses, and more particularly, but not exclusively, to the inspection of ophthalmic lenses in an automated lens manufacturing line.

In general, ophthalmic lenses are manufactured in an automated manufacturing line that includes a number of manufacturing and inspection steps. In the process of manufacturing an ophthalmic lens, commonly referred to as a contact lens, the lens is inspected at multiple stages during the manufacturing process. If a defect exists, the defect can be identified by examining the lens. This inspection at different manufacturing stages not only allows the customer to remove defective items prior to shipment, but also can correct process problems through the analysis of defective items, resulting in a significant improvement in quality and time and effort. Can be reduced. One step of inspecting the contact lens is performed after the contact lens is molded in the mold. At this stage, the presence of bubbles in the polymer of transparent contact lenses and printed contact lenses, defects such as print smears in the case of printed contact lenses, or any other defects appearing in the contact lens Contact lenses are inspected for confirmation.

Color contact lenses or printed contact lenses enhance the beauty of the wearer's eyes. Because of the large market size of such lenses, it is necessary to produce such lenses in large quantities using an automated system. Despite being manufactured in large quantities, it is important that such contact lenses remain in quality because they are in contact with the eye. Currently, there are a number of systems for inspecting lenses after a molding process. A typical system requires that one of the molds be removed or removed in order to provide an open area for the inspection system located over the lens that captures the image of the finished lens. This process increases the time to inspect the finished product and makes it difficult to distinguish whether the defect was before or after separating one of the molds.

There are other prior art systems for inspecting contact lenses when the contact lenses are in the mold assembly. The system includes an illumination system, an optical imaging system, and a camera. In this system, the direct rays illuminate the contact lens and the light rays from the contact lens are captured by the optical imaging system to produce an image of the contact lens. In prior art systems, the entrance pupil of an optical imaging system is located near the lens of the optical imaging system or behind the lens and away from the mold case. The obtained image can only inspect a part (central region) of the contact lens. The light from the peripheral zone of the contact lens does not reach the optical imaging system because some of the cases of the male mold block light rays coming from the peripheral zone.

Therefore, it is required in the related industry to clearly distinguish between the defects that occur during the lens manufacturing process and the defects that occur after the mold separation process. In addition, there is a need in the industry for a system that can perform the inspection of a finished contact lens (a peripheral zone as well as a central zone) when the contact lens is in a cavity between two molds.

In view of the foregoing, an embodiment of the present invention provides a method for inspecting a contact lens when an ophthalmic lens (hereinafter referred to as a contact lens) is molded in a cavity of a mold assembly. The contact lens is inspected when the contact lens is placed in a cavity between a male mold and a female mold of the mold assembly. The contact lens is inspected by illuminating the contact lens using an illumination system. Contact lenses are illuminated not only by direct sunlight but also by angular light rays reflected from the case of the female mold. The portion of each mold corresponding to the cavity between the male mold and the female mold is translucent or transparent so that light can pass through the portion of the mold. The light rays from the contact lens are collected using an optical imaging system. The lens system is designed such that the optical imaging system is disposed inside or outside of the case of the male mold, but is disposed substantially close to the case of the male mold, thereby capturing the light rays coming from the peripheral region of the contact lens.

Also, the light collected by the optical imaging system is used by the camera to capture the image of the contact lens. In some cases, the female mold has a profile that blocks light from the illumination system. In this case, the image captured by the camera will have a dark annular portion in the central zone that can not be used for inspection. In such an image, the captured image is used to inspect only defects in the peripheral region of the contact lens.

In another embodiment, in order to resolve the dark annular zone that appears in the first embodiment, the contact lens is illuminated by a glare beam and an oblique beam. The light rays from the contact lens are split into two channels using a beam splitter. Light split to proceed in the first channel is collected by the first optical imaging system and light split to proceed in the second channel is collected in the second optical imaging system. The first channel optical imaging system is configured in such a way that the entrance pupil is disposed close to the lens. The light rays from the central zone in the contact lens are incident on the optical imaging system of the first channel and the cameras of the first channel optical imaging system capture the images used to inspect the central zone of the contact lens. The second channel optical imaging system is designed such that the entrance pupil of the lens of the optical imaging system is disposed inside or outside of the case of the male mold but is disposed substantially close to the case of the male mold, Can be captured. The camera of the second channel optical imaging system captures the image used to inspect the peripheral zone of the contact lens.

In another embodiment, the contact lens is illuminated by an oblique ray as well as a direct ray. The light rays from the contact lens are collected using an optical imaging system. The optical imaging system of this embodiment is conceptually similar to the previous embodiment, but in this embodiment a single camera and a single image are used to inspect the entire contact lens. The light rays collected by the optical imaging system are used to produce an intermediate image of the central zone and the peripheral zone of the contact lens. The optical imaging system also merges the two intermediate images into a single image captured by a single camera, thereby identifying defects in the peripheral region as well as the central region of the contact lens.

Embodiments also disclose a system for inspecting a contact lens when the contact lens is in a cavity between the male mold and the female mold. The system includes an illumination system, an optical imaging system, and at least one camera. The illumination system is configured to illuminate the contact lens with direct light as well as oblique light reflected from the case of the female mold. The optical imaging system is also configured to capture light rays coming from all areas of the contact lens. In addition, at least one camera is configured to capture an image of the contact lens using light captured by the optical imaging system.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other aspects of the embodiments will be more clearly understood and understood when taken in conjunction with the accompanying drawings and the following detailed description.

The embodiments will be better understood from the following detailed description with reference to the accompanying drawings.

1 is a view showing a mold assembly 100 for molding a contact lens 114 according to an embodiment.
Figure 2 is a diagram illustrating a system 200 for inspecting contact lenses 114 when in mold assembly 100 according to an embodiment.
3 is a diagram showing the overall area of the contact lens 114 to be inspected according to the embodiment.
4 is a diagram illustrating a central zone 402 and a peripheral zone 404 of the contact lens 114 according to an embodiment.
5 is a diagram illustrating a system 200 in which a ray 504 is drawn from a peripheral region of the contact lens 114 according to an embodiment.
FIG. 6 is a view showing an image of the contact lens 114 captured using the system 200, in which a bubble defect is seen in a peripheral region of the contact lens 114 according to an embodiment.
7 is a diagram showing two camera systems of two channels for examining the contact lenses 114 according to an embodiment.
FIG. 8 is a diagram illustrating an image captured by a first channel of a two-channel optical imaging system used for examining a central region of the contact lens 114 according to an embodiment.
9 is a diagram illustrating a single camera system 900 of two channels for examining an entire contact lens 114 according to an embodiment.
10 is a view showing an image of an entire contact lens 114 captured using the system 900 according to an embodiment.

In the following description, various features and advantages of embodiments and embodiments of the present invention will be described in more detail with reference to exemplary embodiments shown in the accompanying drawings. In order to facilitate understanding of the embodiments, descriptions of well-known components and processing techniques are omitted. The examples used herein are intended to be illustrative only and to help those of ordinary skill in the art understand what can be done with the embodiments. Accordingly, these examples should not be construed as limiting the scope of the embodiments.

An embodiment discloses a method and system for inspecting a contact lens when a lens of the eye (hereinafter referred to as a contact lens) lies in a cavity between a male mold mold and a female mold. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described by way of example with reference to the accompanying drawings, in particular to FIGS.

A system for inspecting a contact lens when the contact lens is still in the mold assembly comprises an illumination system, an optical imaging system and at least one camera. In an embodiment, the illumination system is configured to illuminate the contact lens using direct sunlight and oblique light. The optical imaging system is also configured to receive light rays coming from the contact lens. The camera is also configured to capture an image of the contact lens using light received by the optical imaging system.

FIG. 1 illustrates a mold assembly 100 for manufacturing a contact lens 114. The mold assembly 100 includes a male mold 102 and a female mold 104 that form a mold cavity when in the engaged position. The portion of each mold corresponding to the cavity is translucent or transparent so that light can pass through it. The male mold 102 is engaged with the case 106, and the female mold 104 is engaged with the case 108. It should also be noted that the male mold 102 has a curved surface 110 and the female mold 104 has a curved surface 112 so that when the mold assembly 100 is in the engaged position as shown in Figure 1, 112 form cavities corresponding to the shape of the contact lens 114 to be molded. The contact lens 114 is manufactured by molding a contact lens material in a cavity. The mold assembly 100 may also be in a separate position (not shown) from which the contact lens 114 may be withdrawn from the mold assembly 100.

Figure 2 illustrates a system 200 for inspecting contact lenses 114 when the contact lens 114 is in a cavity between the male mold 102 and the female mold 104 according to an embodiment.

The system 200 includes an illumination system 202, an optical imaging system 204, and a camera 206. In an embodiment, the illumination system 202 is configured to illuminate the contact lens 114. The illumination system 202 illuminates the contact lens 114 with an oblique ray reflected from the case of the female mold 108 as well as the direct ray. In the specification, an embodiment is described in which the light rays are considered to be emitted into the case 108 of the female mold 104. In addition, the illumination system 202 is configured to emit direct sunlight and oblique light. In addition, the optical imaging system 204 is configured to receive light rays coming from the contact lens 114. The camera 206 is also configured to use the light rays received by the optical imaging system 204 and to capture the image of the contact lens 114. In an embodiment, the camera 206 is a digital camera configured to capture an image of the contact lens 114.

In Figure 2, the illumination system 202 is disposed on the first side of the mold assembly 100 such that the illumination system 202 is closer to the female mold 104 as compared to the male mold 102. The illumination system 202 is positioned such that light travels from the illumination system 202 towards the contact lens 114. [ In an embodiment, the illumination system 202 is positioned along the longitudinal axis of the mold assembly 100. The illumination system 202 is disposed on the first side of the mold assembly 100 while the optical imaging system 204 and the camera 206 are disposed on the second side of the mold assembly 100. The optical imaging system 204 is disposed between the camera 206 and the mold assembly 100.

Figure 3 shows a complete contact lens 114 that can be thought of as being captured to perform a 100% inspection of the lens 114. 4 is the same as FIG. 3 except that the area to be inspected is divided into a central area (non-shaded area) 402 and a peripheral area (shaded area) 404. In the case of a prior art system for inspecting a contact lens placed in the cavity of a mold assembly, the captured image is not suitable for examining the peripheral zone 404. Hereinafter, the first portion of the contact lens 114 corresponding to the unshaded region 42 shown in FIG. 4 will be referred to as the central region, and the first portion of the contact lens 114 corresponding to the shaded region 404 shown in FIG. 4 The second portion of the contact lens 114 will be referred to as the peripheral region. The shaded area 404 is not captured because the case 106 (see FIG. 2) of the male mold 102 has an internal size S that is smaller than the size D of the contact lens. Therefore, the case 106 of the male mold 102 blocks light in a part of the contact lens. In addition, the entrance pupil of the lens of the optical imaging system of prior art systems is located near or behind the optical imaging system away from the mold. Therefore, a portion of the contact lens corresponding to the shaded region 404 (see FIG. 4) can not be examined with a prior art system.

In an embodiment, the contact lens 114 is inspected when the mold assembly 100 is in the engaged position, meaning that the contact lens 114 lies in a cavity between the male mold 102 and the female mold 104 (See Fig. 2). The illumination system 202 illuminates the contact lens 114 with an oblique ray reflected from the case of the female mold as well as the direct ray.

Figure 5 shows a system 200 in which a ray 504 emerging from a peripheral zone of the contact lens 114 is marked according to an embodiment. Light rays 504 from the peripheral zone of the contact lens pass through the entrance pupil 502 of the optical imaging system 204. The entrance pupil 502 of the optical imaging system 204 is disposed within or near the case 106 of the male mold, but is disposed substantially near the case 106 of the male mold. The optical imaging system is located remotely from the case 106 of the male mold. The incident pupil 502 can be placed within the case 106 of the male mold or placed outside but placed substantially near the case 106 of the male mold to capture the light rays coming from the peripheral region of the contact lens 114 have.

The camera 206 uses light incident on the optical imaging system 204 to capture the image which is later captured within the peripheral zone 404 of the contact lens 114 when the contact lens 114 is still in the mold Will be processed to confirm the presence of defects.

Figure 6 illustrates an image 600 of a contact lens 114 captured using the system 200 in accordance with an embodiment. In this image, a bubble defect 602 is present in the surrounding area. The illumination system 202 (see FIG. 5) illuminates the contact lens 114 with not only direct light but also oblique light reflected from the case of the female mold. The optical imaging system 204 utilizes an oblique ray from the contact lens 14 to produce the image of FIG. 6 captured by the camera 206. It should be noted that the case of the female mold 106 has a profile 508 that blocks some of the light from the illumination system 202 and there is no light that is reflected from this area of the case of the female mold 104 . The dark annular portion 604 (see Fig. 6) in the captured image 600 corresponds to this profile 508. [ In Fig. 5, line 506 represents an imaginary ray corresponding to a profile 508 that results in a dark ring-shaped portion in the image. The dark ring shaped portion is disposed in the central region of the contact lens 114. Therefore, the resulting final image can only be used to inspect the peripheral region of the contact lens 114.

In an embodiment, the illumination system 202 is configured to illuminate the central area using an oblique ray as well as a direct ray, and the optical imaging system is configured to capture other images used to inspect the central area of the contact lens. Capture two images enables 100% inspection of contact lenses.

FIG. 7 illustrates two camera system 700 of two channels for examining the contact lens 114 in the mold assembly 100, according to an embodiment. The system 700 shown in FIG. 7 includes some elements that are common to the elements of the system 200, and these common elements have been given the same reference numerals. In system 700, an optical imaging system includes a beam splitter 708, a first channel optical imaging system 702, and a second channel optical imaging system 204. The system 700 also includes a first camera 704 coupled with a first channel optical imaging system 702 and a second camera 206 coupled with a second channel optical imaging system 204. The beam splitter 708 is configured to split the light beam 706 from the contact lens 114 into a first channel and a second channel. In addition, the entrance pupil 502 of the second channel optical imaging system 204 is disposed within or near the case 106 of the male mold, but is disposed substantially near the case 106 of the male mold. The second channel optical imaging system 204 itself is disposed away from the case 106. The incident pupil 502 may be placed inside or outside the case 106 of the male mold to capture the light rays coming from the peripheral region of the contact lens 114 by placing it substantially near the case 106 of the male mold . The light rays of the second channel incident on the second channel optical image system 204 and the second camera 206 enable capture of an image as shown in FIG. This image is used to inspect the peripheral region of the contact lens 114.

In addition, the light rays of the first channel incident on the first channel optical image system 702 and the first camera 704 enable capture of other images as shown in FIG. The first channel optical imaging system 702 is a standard optical imaging system similar to prior art systems and has an entrance pupil disposed away from the case 106 of the male mold.

By analyzing the two images, a defect can be detected in both the central zone as well as in the peripheral zone when the contact lens is still in the mold assembly 100, resulting in a 100% inspection of the finished lens 114. It is also possible to use two different optical powers for each channel. In addition, the system can use two different resolution cameras for each channel. Such flexibility can improve the performance of the embodiment.

9 also shows a two-channel single-camera system 900 for inspecting the contact lens 114 in the mold assembly 100 in accordance with the practice. The system 900 shown in FIG. 9 has some elements in common with the elements of system 200 and system 700, and these common elements are given the same reference numerals. The optical imaging system 901 of the system 900 includes a group of lens elements 902, 906, 910, 914, 918 and 922, beam splitters 904 and 916, a first field of view aperture 908, An aperture stop 920 and mirrors 912 and 924.

The optical imaging system 901 has two channels. The first channel includes items 906, 908, 910, and 912 and the second channel includes items 918, 920, 922, and 924. There are several common items 902, 904, 914, 916 for both optical channels. The positions of the entrance pupils of the two optical channels may be different. The entrance pupil of the first channel may be located remotely from the mold. In contrast, the entrance pupil 502 of the second channel may be disposed within or substantially outside the case 106 of the male mold 102, but may be disposed substantially near the case of the male mold. The optical imaging system 901 itself is located away from the mold.

The second channel of the optical imaging system 901 may be placed in contact lens (not shown) by placing the entrance pupil 502 inside the case 106 of the male mold 102 or by placing it closer to the case of the male mold, 114). ≪ / RTI >

Light from the contact lens 114 reaches the beam splitter 904 through the group of lens elements 902. The beam splitter splits the beam into two channels.

The two channels generate two intermediate images which are merged into a single image captured by the camera 206 attached to the optical imaging system 901. The first intermediate image is the image of the central region of the contact lens 114 and the second intermediate image is the image of the peripheral region of the contact lens 114. The first field of view aperture 908 is equal to the diameter of the central region of the first intermediate image. Also, the second field stop 920 is a ring-shaped stop, the outer diameter of the ring is equal to the outer diameter of the peripheral region of the image, and the inner diameter of the ring is equal to the inner diameter of the peripheral region of the second intermediate image. Further, the center disc of the second field stop 920 is opaque. Two intermediate images filtered by the viewing apertures 908 and 920 are also created and merged into a single image as shown in FIG. The optical magnification of the intermediate images may be different. In the image shown in Fig. 10, there is a black annular portion 3 corresponding to the edge of the opaque central circle of the second field stop. Depending on the optical design, the width of the black annular portion 3 can vary and can also be zero (no black annular portion). Further, in the embodiment, it is possible to adjust the optical magnification of the intermediate image and the optical magnification of the other image to provide a superimposed image of the center and peripheral regions. Overlapping of the intermediate image results in superimposition of a small area of the contact lens near the boundary of the central region and the peripheral region of the contact lens 114. The final composite image is used to inspect both the central and peripheral regions of the contact lens 114. This results in a 100% inspection of the finished lens when the lens is still in the mold.

The embodiments disclosed in the specification may be realized through at least one software program running on at least one hardware device on the network.

It will be appreciated by those skilled in the art that the foregoing description of certain embodiments is indicative of the general nature of the present invention so that those skilled in the art will readily appreciate that many modifications may be made thereto without departing from the generic concept of the present invention, And accordingly, such modifications and improvements are intended to be equivalents of the disclosed embodiments of the invention and should be understood as being included within the scope of equivalents. It is to be understood that the phraseology or terminology used herein is for the purpose of description and not of limitation. Therefore, although the preferred embodiments have been described in the specification, those skilled in the art will appreciate that the embodiments may be practiced within the spirit and scope of the claims as set forth in the specification.

Claims (17)

As a method for inspecting a defect in a contact lens when the contact lens is placed in a cavity between the male mold and the female mold,
Each of the male mold and the female mold is coupled to each of these cases,
The method comprises:
The contact lens is illuminated using direct sunlight and oblique light,
A light beam from a contact lens is captured by a two-channel optical imaging system,
A first channel of a two-channel optical imaging system is configured to capture a light beam from a central zone of the contact lens,
A second channel of a two-channel optical imaging system having an entrance pupil at a different position from an entrance pupil of a first channel of a two-channel optical imaging system to capture light rays from a peripheral region of the contact lens,
A single composite image is captured from a two-channel optical imaging system, or a single composite image is captured using a light beam incident on each of two channels of a two-channel optical imaging system,
Comprising processing each of the images from each of the two channels of the two-channel optical imaging system or a single composite image from the two-channel optical imaging system to detect defects in the contact lens. . The method according to claim 1,
Illuminating a contact lens using an oblique ray comprises projecting a light beam obliquely onto an interior surface of a case of a female mold to illuminate the contact lens and using reflected light rays. The method according to claim 1,
Wherein capturing a ray of light from the contact lens comprises splitting the ray of light from the contact lens into a first channel and a second channel. The method according to claim 1,
Capturing each image from the two channels can be accomplished by capturing the image using a ray incident on the first channel to inspect the central region of the contact lens and entering the second channel to inspect the peripheral region of the contact lens Wherein the method comprises capturing an image using a light beam. The method according to claim 1,
Capturing a single composite image includes displaying two intermediate images from two channels to inspect both the central zone and the peripheral zone of the contact lens and then merging the two intermediate images into a single image And the contact lens is inspected. The method according to claim 1,
Wherein the peripheral zone and the central zone comprise an area of the contact lens under examination. A system for inspecting a defect in a contact lens when the contact lens is placed in a cavity between the male mold and the female mold,
Each of the male mold and the female mold is coupled to each of these cases,
The system comprises:
An illumination system configured to illuminate a contact lens lying between the male mold and the female mold by radiating direct rays and oblique rays into the housings of the female mold and the male mold,
A first channel optical imaging system configured to capture a beam of light emerging from a central zone of the contact lens and a second channel optical imaging system configured to capture a beam of light emerging from a peripheral zone of the contact lens, A second channel optical imaging system configured to have a first channel optical imaging system,
Two cameras for capturing respective images from two channels of a two-channel optical imaging system or for capturing a single composite image from a two-channel optical imaging system, and
Characterized by comprising an image processing system for analyzing individual images from each of the two channels of a two-channel optical imaging system or a single composite image from a two-channel optical imaging system to detect defects in the contact lens Contact lens inspection system. 8. The method of claim 7,
An illumination system configured to illuminate a contact lens using an oblique light beam projects an oblique light beam onto an interior surface of a case of a female mold to illuminate the contact lens and uses the reflected light beam. 8. The method of claim 7,
Wherein the two-channel optical imaging system is configured to split light from the contact lens into a first channel and a second channel. 8. The method of claim 7,
The two cameras used include a first camera for capturing an image using a ray incident on the first channel to inspect a central region of the contact lens, And a second camera for capturing an image using the second camera. 8. The method of claim 7,
Wherein the single camera used comprises a single camera for capturing a composite image formed by merging two intermediate images corresponding to two channels. 8. The method of claim 7,
The male mold and the female mold form a mold cavity when the male mold and the female mold are in the engaged position, and each of the male mold and the female mold corresponding to the cavity is semitransparent or translucent Wherein the contact lens inspection system comprises: 8. The method of claim 7,
Wherein the first channel optical imaging system has an entrance pupil located remotely from the case of the male mold. 8. The method of claim 7,
Wherein the first channel optical imaging system produces a first intermediate image that is an image of a central region of the contact lens and the second channel optical imaging system generates a second intermediate image that is an image of a peripheral region of the contact lens. Lens Inspection System. 10. The method of claim 9,
Wherein each channel of the two-channel optical imaging system uses another camera of a different optical resolution. 15. The method of claim 14,
Wherein each channel of the two-channel optical imaging system includes at least two viewing apertures for filtering the first and second intermediate images,
The first viewing aperture used for the first channel is equal to the diameter of the central region of the first intermediate image,
Wherein the second viewing aperture is a ring-shaped aperture, the outer diameter of the ring being equal to the outer diameter of the peripheral region of the second intermediate image, and the inner diameter of the ring being equal to the inner diameter of the peripheral region of the second intermediate image. system. 15. The method of claim 14,
The central region of the first intermediate image is surrounded by the black annular portion and the optical magnification of the first and second intermediate images can be adjusted so that the overlap of the first and second intermediate images is equal to the width of the black annular portion Wherein the black annular portion can be completely removed to form an entire image of the contact lens for inspection.
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PCT/SG2011/000074 WO2011084109A2 (en) 2010-01-05 2011-02-23 Method and apparatus for inspecting ophthalmic lens

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WO2011084109A3 (en) 2011-10-27

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