CN112557418A - Corneal contact lens pinhole imaging device and method - Google Patents

Corneal contact lens pinhole imaging device and method Download PDF

Info

Publication number
CN112557418A
CN112557418A CN202011468738.2A CN202011468738A CN112557418A CN 112557418 A CN112557418 A CN 112557418A CN 202011468738 A CN202011468738 A CN 202011468738A CN 112557418 A CN112557418 A CN 112557418A
Authority
CN
China
Prior art keywords
contact lens
corneal contact
imaging device
sample
refractive optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011468738.2A
Other languages
Chinese (zh)
Inventor
赵友全
乜灵梅
查涛
张凯
管志强
房彦军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin University
Original Assignee
Tianjin University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tianjin University filed Critical Tianjin University
Priority to CN202011468738.2A priority Critical patent/CN112557418A/en
Publication of CN112557418A publication Critical patent/CN112557418A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • 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
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • 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
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N2021/0106—General arrangement of respective parts
    • G01N2021/0112—Apparatus in one mechanical, optical or electronic block

Abstract

A cornea contact lens pinhole imaging device and a method thereof, the cornea contact lens pinhole imaging device comprises a base; the light source is arranged on the base; a refractive optical component disposed above the light source; the aperture-adjustable small-hole imaging plate is arranged above the refractive optical component; the sample carrier is provided with a sample container, and a sample and a care solution are contained in the sample container; and an image acquisition unit disposed above the sample container; wherein, the light source, the small hole imaging plate, the sample container and the image acquisition unit are coaxial in center. According to the small hole imaging device, the edge of an image acquired by the camera is obvious after the light of the adjustable small hole plate passes through, the defects such as edge cracking, edge breakage, vehicle brightness and the like are clear at a glance, and after the image is formed by the device, the capability of operators for identifying the defects of the product is greatly improved, and the daily operating efficiency is improved.

Description

Corneal contact lens pinhole imaging device and method
Technical Field
The invention belongs to the field of biomedical engineering, and particularly relates to a corneal contact lens pinhole imaging device and method.
Background
The cornea contact lens is also called contact lens, is widely used for vision correction and glasses treatment, is a medical apparatus for correcting myopia, relieving eye vision pressure and treating eye diseases, is composed of a high polymer gel compound, is usually produced by turning, injection molding and other processes, and often causes product structure defects such as edge cracking, edge breakage, vehicle brightness, mold brightness, impurities and the like due to inaccurate positioning, uneven stress and mold defects in the manufacturing process. Therefore, the appearance quality detection is indispensable in the process of producing the contact lens, the existing detection method is an amplification projector, the amplified mirror image is reflected and projected onto a diffuse reflection plane or a flat plate, and the defect-free image is judged by human eye observation. The method has the advantages of simple structure and convenience in use, but because the projection light is uneven, the imaging quality is poor, the defects are difficult to interpret, and a clearer image is often obtained through continuous adjustment of the focal length.
Disclosure of Invention
It is therefore one of the primary objectives of the claimed invention to provide an apparatus and method for forming an aperture of a contact lens, which at least partially solves at least one of the above problems.
To achieve the above object, as one aspect of the present invention, there is provided a corneal contact lens pinhole imaging device comprising:
a base;
the light source is arranged on the base;
a refractive optical component disposed above the light source;
the aperture-adjustable small-hole imaging plate is arranged above the refractive optical component;
the sample carrier is provided with a sample container, and a sample and a care solution are contained in the sample container; and
the image acquisition unit is arranged above the sample container;
wherein, the light source, the small hole imaging plate, the sample container and the image acquisition unit are coaxial in center.
As another aspect of the present invention, there is also provided a corneal contact lens pinhole imaging method using the corneal contact lens pinhole imaging device as described above, including:
the light emitted by the light source is refracted and scattered in all directions through the refractive optical component;
the scattered light rays pass through the small hole imaging plate and enter the sample container to irradiate the corneal contact lens sample;
the light rays refracted and scattered by the corneal contact lens sample enter the image acquisition unit to form an image.
Based on the technical scheme, compared with the prior art, the corneal contact lens pinhole imaging device and the method have at least one or part of the following advantages:
1. according to the method for forming the pinhole image of the corneal contact lens, the light transmitted by the adjustable pinhole plate is refracted and scattered on a plurality of interfaces such as the corneal contact lens body, the container and the care solution, so that the intensity of the direct light is greatly attenuated, and the shape and the defects of the edge of the contact lens body are highlighted;
2. according to the small hole imaging device, the edge of an image acquired by the camera is obvious after the light of the adjustable small hole plate passes through, the defects such as edge cracking, edge breakage, vehicle brightness, mold brightness and impurities are clear at a glance, the identification capability of operators on product defects is greatly improved after the image is formed by the device, and the daily operating efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a corneal contact lens aperture imaging device in an embodiment of the present invention;
FIG. 2 is an image obtained by a corneal contact lens pinhole imaging method in example 1 of the present invention;
FIG. 3 is a lens image of a contact lens tester of a human eye according to comparative example 1 of the present invention;
FIG. 4 is a view showing another set of lenses of a contact lens tester for a human eye according to comparative example 1 of the present invention;
FIG. 5 is a diagram showing a lens for a low-angle shadowless ring light reflection imaging method in comparative example 2 of the invention;
FIG. 6 is a diagram of a lens showing a backlight transmission imaging process of comparative example 3 of the present invention.
Description of reference numerals:
100-a camera; 101-a sensor; 102-an objective lens; 103-a carrier; 104-care solution; 105-a sample; 106-hemispherical container; 107-aperture imaging plate; 108-a refractive optical plate; 109-LED light group; 110-a base plate; 111-a base; 112-a computer; 113-image acquisition card.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention aims to solve the technical problem of difficulty in extracting defect characteristics in the existing corneal contact lens appearance quality detection, and provides a pinhole imaging method and an imaging device for highlighting surface quality defects of a corneal contact lens.
The invention discloses a corneal contact lens pinhole imaging device, comprising:
a base;
the light source is arranged on the base;
a refractive optical component disposed above the light source;
the aperture-adjustable small-hole imaging plate is arranged above the refractive optical component;
the sample carrier is provided with a sample container, and a sample and a care solution are contained in the sample container; and
the image acquisition unit is arranged above the sample container;
wherein, the light source, the small hole imaging plate, the sample container and the image acquisition unit are coaxial in center.
In some embodiments of the invention, the distance between the refractive optical component and the aperture imaging plate and the distance between the refractive optical component and the sample container are adjustable.
In some embodiments of the invention, the image acquisition unit comprises an objective lens, a sensor, a camera, an image acquisition card, and a computer;
in some embodiments of the invention, the objective lens is disposed above the sample carrier;
in some embodiments of the invention, the camera is disposed above the objective lens.
In some embodiments of the invention, the light source comprises a group of LED lights;
in some embodiments of the present invention, the LED light group is a rectangular array light group in which a plurality of LEDs are arranged;
in some embodiments of the present invention, the luminous intensity of the LED light group is adjustable.
In some embodiments of the invention, the refractive optical component comprises a refractive optical plate or sheet;
in some embodiments of the present invention, the refractive optical component is made of a material comprising optical grade polymethyl methacrylate.
In some embodiments of the invention, the adjustable aperture range of the small-aperture imaging plate is 0.2 to 12 mm.
In some embodiments of the invention, the sample container is a hemispherical container.
In some embodiments of the present invention, the material used for the sample container is quartz glass.
The invention also discloses a cornea contact lens pinhole imaging method, which adopts the cornea contact lens pinhole imaging device, and comprises the following steps:
light emitted by the light source is scattered through the refractive optical component;
the scattered light rays pass through the small hole imaging plate and enter the sample container to irradiate the corneal contact lens sample;
the light rays refracted and totally reflected by the corneal contact lens sample enter the image acquisition unit to form an image.
In some embodiments of the invention, the voltage of the light source ranges from 14.5 to 16V.
As shown in fig. 1, the corneal contact lens aperture imaging device of the present embodiment mainly includes a base 111, a base plate 110, an LED optical group 109, a refractive optical plate 108, an aperture imaging plate 107, a carrier 103 of a corneal contact lens sample 105, a hemispherical container 106, an objective lens 102, a sensor 101, a camera 100, an image acquisition card 113, a computer 112, and the like. The base plate 110 is fixed on the base 111, and the LED light group 109, the refractive optical plate 108, the aperture imaging plate 107, the hemispherical container 106, and the camera 100 are fixed on the base plate 110. The LED light group 109, the refractive optical plate 108, the small-hole imaging plate 107, and the hemispherical container 106 are connected together by an acrylic plate, and fixed on the base 111 by screws. The camera 100, the objective lens 102, the hemispherical container 106, the small-hole imaging plate 107 and the LED light group 109 are coaxially arranged in the center, so that a uniform and defect highlighted digital image of the corneal contact lens is obtained.
The LED light group 109 is formed by arranging a plurality of LEDs in a rectangular array, and the light intensity of the LED light group can be adjusted on a computer PC through serial or network interface settings.
The refractive optical plate 108 uses an optical-grade plate as a base material, and has high light transmittance and good light scattering effect, thereby obtaining uniform illumination.
The small hole imaging plate 107 uses a round small hole plate with the adjustable hole diameter of 0.2 mm-12 mm, and the outer edge of the small hole plate is provided with knurled threads.
The hemispherical container is made of quartz glass with high light transmittance, and has a diameter of 25-28mm and a thickness of 1.5-2.5mm, in this embodiment, the diameter is 28mm and the thickness is 2mm, and the hemispherical container is required to have good light transmittance and no defects such as watermark, scratch, bubble and the like.
The aperture imaging plate 107 must be coaxial between the hemispherical container 106 and the refractive optic plate 108, the aperture diameter can be adjusted, and the relative distance between the aperture plate and the refractive optic plate 108 and hemispherical container 106 can be adjusted up or down.
The hemispherical container 106 is filled with a solution of 0.9% sodium chloride aqueous solution.
The corneal contact lens sample 105 has a diameter of 13.5-14.5 mm.
The camera 100 is a CMOS camera.
Example 1
In this embodiment, a contact lens sample 105 is immersed in a treatment solution 104, and a hemispherical container 106 containing the treatment solution is made of quartz glass and is fastened to a carrier 103 by a fixing screw. Light emitted by the LED light group 109 is changed into a uniform surface light source through the light scattering sheet 108, part of light emitted by the light source passes through the adjustable small hole plate 107 and then enters the hemispherical container, the light enters the care solution after being refracted by quartz glass for the first time, part of light directly penetrates through the contact lens body sample 105 and penetrates out of the liquid level, and part of light irradiates the contact lens body sample 105 to be refracted for the second time. The light after the second refraction partially penetrates through the lens sample 105 and enters the care solution, and part of the light is totally reflected due to the large-angle incident angle. Part of the light reaching the edge of the lens still passes through the liquid surface after being refracted and totally reflected at the interface of the colloid-care solution, and part of the light generates anisotropic scattering at the edge of the lens, the two parts of light are converged by the objective lens 102 and then enter the CMOS sensor 101 for imaging, and a digital image of the camera 100 is transmitted into the computer 112 through the image acquisition card 113. The pinhole imaging structure of the keratoscope body is formed, the acquired image result is shown in fig. 2, (a) the image is a notch defect, and (b) the image shows a die edge defect.
Comparative example 1
Fig. 3 and 4 show lens images displayed by a corneal contact lens projector, which have the disadvantages of blurred imaging, low resolution, small focal plane, and need to realize defect identification in the continuous focusing process. And the difference between the background and the foreground is small, and the defect distinguishing is not easy to carry out. Fig. 3 (b) is an enlarged schematic view of fig. (a), and fig. 4 (b) is an enlarged schematic view of fig. (a).
Comparative examples 2 and 3
Fig. 5 and 6 are side-view (shadowless ring light illumination) and back-view (backlight transmission) imaging, which are both common imaging methods for machine vision, wherein fig. 5 (b) is an enlarged schematic view of fig. a, and fig. 6 (b) is an enlarged schematic view of fig. a, as shown in fig. 5 and 6, the images of impurities are serious, the edge contrast is poor, the imaging is not clear, the defect identification cannot be performed, and the imaging is not suitable for defect imaging of a contact lens.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A corneal contact lens aperture imaging device, comprising:
a base;
the light source is arranged on the base;
a refractive optical component disposed above the light source;
the aperture-adjustable small-hole imaging plate is arranged above the refractive optical component;
the sample carrier is provided with a sample container, and a sample and a care solution are contained in the sample container; and
the image acquisition unit is arranged above the sample container;
wherein, the light source, the small hole imaging plate, the sample container and the image acquisition unit are coaxial in center.
2. The corneal contact lens aperture imaging device of claim 1,
the distance between the refractive optical assembly and the aperture imaging plate and the distance between the refractive optical assembly and the sample container are adjustable.
3. The corneal contact lens aperture imaging device of claim 1,
the image acquisition unit comprises an objective lens, a sensor, a camera, an image acquisition card and a computer;
the objective lens is arranged above the sample carrier;
the camera is disposed above the objective lens.
4. The corneal contact lens aperture imaging device of claim 1,
the light source comprises an LED light group;
the LED light group is a rectangular array light group formed by arranging a plurality of LEDs;
the luminous intensity of the LED light group can be adjusted.
5. The corneal contact lens aperture imaging device of claim 1,
the refractive optical component comprises a refractive optical plate or a refractive optical sheet;
the material used for the refractive optical component comprises optical-grade polymethyl methacrylate.
6. The corneal contact lens aperture imaging device of claim 1,
the adjustable aperture range of the small-hole imaging plate is 0.2-12 mm.
7. The corneal contact lens aperture imaging device of claim 1,
the sample container is a hemispherical container.
8. The corneal contact lens aperture imaging device of claim 1,
the sample container is made of quartz glass.
9. A corneal contact lens pinhole imaging method using the corneal contact lens pinhole imaging apparatus according to any one of claims 1 to 8, comprising:
the light emitted by the light source is refracted and scattered in all directions through the refractive optical component;
the scattered light rays pass through the small hole imaging plate and enter the sample container to irradiate the corneal contact lens sample;
the light rays refracted and scattered by the corneal contact lens sample enter the image acquisition unit to form an image.
10. The corneal contact lens aperture imaging method of claim 9,
the voltage range of the light source is 14.5 to 16V.
CN202011468738.2A 2020-12-15 2020-12-15 Corneal contact lens pinhole imaging device and method Pending CN112557418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011468738.2A CN112557418A (en) 2020-12-15 2020-12-15 Corneal contact lens pinhole imaging device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011468738.2A CN112557418A (en) 2020-12-15 2020-12-15 Corneal contact lens pinhole imaging device and method

Publications (1)

Publication Number Publication Date
CN112557418A true CN112557418A (en) 2021-03-26

Family

ID=75064603

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011468738.2A Pending CN112557418A (en) 2020-12-15 2020-12-15 Corneal contact lens pinhole imaging device and method

Country Status (1)

Country Link
CN (1) CN112557418A (en)

Similar Documents

Publication Publication Date Title
JP3578790B2 (en) Lighting system for eye lens inspection
US3857626A (en) Microscope coaxial illumination apparatus
AU649291B2 (en) Process and apparatus for examining optical components, especially optical components for the eye and device for illuminating clear-transparent test-objects
CN104398236B (en) A kind of Large visual angle fundus imaging device
JP2013257586A (en) Illumination and observation apparatus
US10337977B1 (en) Systems and methods for glass particle detection
KR20190116427A (en) Imaging Device, Image Display System, and Image Display Method
CN103959046A (en) Illumination device for inspections
CN213903357U (en) Cornea contact lens small hole imaging device
CN112557418A (en) Corneal contact lens pinhole imaging device and method
CN208071854U (en) For monitoring the device for producing the process of nanofiber by Electrospun or electrostatic spinning
CN207721799U (en) A kind of camera is total to light path imaging device with OCT
CN106153300B (en) A kind of rigid endoscope light efficiency uniformity detecting method
CN201759546U (en) Optical lens with high-resolution wide angle and capable of automatically focusing and retinal imaging
CN213309634U (en) Hand-held type eye ground camera of leading-in illumination light source of optic fibre
CN110672303B (en) Optical fiber end face geometric parameter measuring device and method based on annular LED illumination
CN105807413B (en) It is a kind of to fall radioglold phase microscope based on light modulation techniques
AU2019101308A4 (en) Analyzing apparatus for after cataract in rabbit eyes based on image gray calculation and analysis, and evaluation method of after cataract severity
CN204556221U (en) A kind of for rigid endoscope light efficiency uniformity detection
US20070121109A1 (en) Lens inspection
Dempster Principles of microscope illumination and the problem of glare
CN207198057U (en) A kind of detection means of the bottom of bottle expansion based on machine vision
CN212515204U (en) Anti-reflection device of three-dimensional microscope special for insects
US20080144167A1 (en) Optical imaging system and method for high speed and high resolution
US20240102884A1 (en) System and method for inspecting mold defects in wet ophthalmic lenses

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination