CN104523221A - Eye ground camera imaging system based on liquid lens focusing - Google Patents
Eye ground camera imaging system based on liquid lens focusing Download PDFInfo
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- CN104523221A CN104523221A CN201410781071.XA CN201410781071A CN104523221A CN 104523221 A CN104523221 A CN 104523221A CN 201410781071 A CN201410781071 A CN 201410781071A CN 104523221 A CN104523221 A CN 104523221A
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Abstract
The invention discloses an eye ground camera imaging system based on liquid lens focusing. The system comprises an imaging subsystem and an illumination subsystem, the imaging subsystem comprises an eye objective lens, an imaging objective lens, a receiving device and a displaying device which are arranged in sequence, the illumination subsystem comprises a light source, a uniform light mirror and an eye objective lens, the illumination subsystem and the imaging subsystem are connected together through a semi-reflecting semi-transmitting lens, the eye ground camera imaging system further comprises a liquid varifocus lens, the liquid varifocus lens is arranged between the eye objective lenses and an image surface of the imaging subsystem, the liquid varifocus lens is matched with a corresponding driving device, and the receiving device is a charge coupled device (CCD). According to the eye ground camera imaging system based on liquid lens focusing, the liquid varifocus lens is introduced to the imaging system, input voltage or mechanical force that is exerted on a lens body is changed so that surface curvature of the liquid lens can be changed, clear imaging of human eyes with different visions can be achieved, the mechanical structure is simple, requirements of proficiency of operators are low, and operation by a professional doctor or nurse is not required.
Description
Technical field
The present invention relates to medical science fundus imaging technical field, particularly relate to a kind of fundus camera imaging system based on liquid lens focusing type.
Background technology
Human eye retina, cries optical fundus again, is the thin film of one deck high level of architectural complexity, is the important component part of human eye.The status of retina in eyes is equivalent to the receptor of imaging system.Eyes retina is dispersed with a large amount of blood vessels, the blood-vessels on human eye retina is observed, many ocular disease can be carried out for doctor, or even the diagnosis of whole body numerous disease provides important evidence.Such as, diabetic retinopathy is the main cause of diabetics blinding, one of four large pathological changes having become patient's blinding.It is sick that diabetes are becoming a kind of global prevalence, and the whole world has 3.47 hundred million people to suffer from diabetes, it is predicted, in 10 years from now on, the death sum caused by diabetes, by increase by more than 50%, will become the global the seventh-largest cause of death to the year two thousand thirty diabetes.After finding diabetes, except strict glycemic control, blood pressure and blood fat under physician guidance, also need to make regular check on optical fundus, treat in time according to the state of an illness, prevent new vessels from occurring, preserve certain vision.For wet age-related macular degeneration not the rule for the treatment of cause 100% blinding, early discovery is crucial, and early treatment's Be very effective.Before obvious visual disorder appears in patient, carrying out dynamic retinoscopy in advance, is unique effective way of Timeliness coverage pathological changes, treatment in time.In addition, as the disease such as coronary heart disease, hypertension, also by carrying out early stage retina examination, can find early, treating in time.Fundus camera is the Ophthalmologic apparatus for checking retinopathy, is the important means that doctor carries out dynamic retinoscopy.
Fundus camera is a kind of important Ophthalmologic apparatus for observer's retinopathy, has important application clinically.The optical system of fundus camera comprises illuminator and imaging system, and operating spectrum band covers near-infrared and visible ray, and near-infrared and visible illumination system realize optical fundus evenly, fully
Illumination, imaging system realizes retina to be finally imaged on to be positioned on the sensor of optimum image plane.
The domestic research for fundus camera is started late, and the fundus camera majority of current domestic use relies on from external import, and then carries out digital improvement.The domestic research for fundus camera is also more limited, and relevant research paper is fewer.There is following problem in most of fundus cameras of domestic-developed: equipment needs the doctor of specialty or nurse to operate, and equipment cost is taken with medical expense higher, need to carry out mydriasis with medicine to human eye, and mydriasis has certain side effect to human body.These all seriously limit the use of fundus camera.
Therefore prior art awaits further improvement.
Summary of the invention
In view of above-mentioned weak point of the prior art, the object of the invention is to for user provides a kind of fundus camera imaging system based on liquid lens focusing type, being intended to solve equipment in prior art needs the doctor of specialty or nurse to operate, equipment cost is taken with medical expense higher, need to carry out mydriasis with medicine to human eye, and mydriasis has the problem of certain side effect to human body.
The technical scheme that technical solution problem of the present invention adopts is as follows:
Based on a fundus camera imaging system for liquid lens focusing type, wherein, imaging subsystems and illumination subsystems is comprised;
Described imaging subsystems is made up of connect order object lens, image-forming objective lens, receiving device and the display device set gradually;
Illumination subsystems by light source, even light microscopic and connect order object lens composition;
Described illumination subsystems and described imaging subsystems are coupled together by half-reflecting half mirror;
Also comprise for passing through to regulate input voltage determination lens surface curvature or the liquid zoom lens by being added on the mechanical force determination lens surface curvature on lens mirror body in described fundus camera imaging system, described liquid zoom lens is arranged between image-forming objective lens and the image planes of image-forming objective lens, and described liquid zoom lens is also equipped with the corresponding driving device for focusing altogether; Described receiving device is CCD;
The light sent by light source incides human eye through the reflection of even light microscopic transmission, half-reflecting half mirror and after connecing the transmission of order object lens successively; The light entering human eye is by outgoing after fundus reflex, and XianCheng's intermediary image after connecing order object lens and collecting, then is imaged onto on receiving device by image-forming objective lens by intermediary image, eventually passes display device and show.
The described fundus camera imaging system based on liquid lens focusing type, wherein, also comprises the aperture diaphragm connect described in being arranged between order object lens and observer's eyes.
The described fundus camera imaging system based on liquid lens focusing type, wherein, described liquid zoom lens is ARCTIC 416SLV3 model liquid lens.
The described fundus camera imaging system based on liquid lens focusing type, wherein, described light source is visible light source.
The described fundus camera imaging system based on liquid lens focusing type, wherein, described light source is infrared light light source.
A kind of fundus camera imaging system based on liquid lens focusing type provided by the present invention, comprises imaging subsystems and illumination subsystems; Described imaging subsystems is made up of connect order object lens, image-forming objective lens, receiving device and the display device set gradually; Illumination subsystems by light source, even light microscopic and connect order object lens composition; Described illumination subsystems and described imaging subsystems are coupled together by half-reflecting half mirror; Also comprise for passing through to regulate input voltage determination lens surface curvature or the liquid zoom lens by being added on the mechanical force determination lens surface curvature on lens mirror body in described fundus camera imaging system, described liquid zoom lens is arranged between image-forming objective lens and the image planes of image-forming objective lens, and described liquid zoom lens is also equipped with the corresponding driving device for focusing altogether; Described receiving device is CCD; The light sent by light source incides observer's eyes through the reflection of even light microscopic transmission, half-reflecting half mirror and after connecing the transmission of order object lens successively; The light entering observer's eyes is by outgoing after fundus reflex, and XianCheng's intermediary image after connecing order object lens and collecting, then is imaged onto on receiving device by image-forming objective lens by intermediary image, eventually passes display device and show.The present invention introduces liquid zoom lens in imaging systems, the surface curvature of the mechanical force liquid lens on lens mirror body is added on by change input voltage or change, realize the human eye blur-free imaging to different diopter, its frame for movement is simple, to operator proficiency level require lower, need not specialty doctor or nurse operate.
Accompanying drawing explanation
Fig. 1 is the structural representation of the fundus camera imaging system preferred embodiment based on liquid lens focusing type of the present invention.
Fig. 2 is the optical structure chart of liquid zoom lens.
Fig. 3 is the light path schematic diagram of fundus camera imaging system second embodiment based on liquid lens focusing type of the present invention.
Fig. 4 is that the fundus camera imaging system based on liquid lens focusing type of the present invention is to the MTF curve chart of normal eye.
Detailed description of the invention
For making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only for explaining the present invention, being not intended to limit the present invention.
Please simultaneously see Fig. 1 and Fig. 2, wherein Fig. 1 is the structural representation of the fundus camera imaging system preferred embodiment based on liquid lens focusing type of the present invention, and Fig. 2 is the optical structure chart of liquid zoom lens.The described fundus camera imaging system based on liquid lens focusing type, comprising:
Imaging subsystems and illumination subsystems;
Described imaging subsystems is made up of connect order object lens 110, image-forming objective lens 120, receiving device 130 and the display device 140 set gradually;
Illumination subsystems by light source 210, even light microscopic 220 and connect order object lens 110 and form;
Described illumination subsystems and described imaging subsystems are coupled together by half-reflecting half mirror 300;
Also comprise for passing through to regulate input voltage determination lens surface curvature or the liquid zoom lens 400 by being added on the mechanical force determination lens surface curvature on lens mirror body in described fundus camera imaging system, described liquid zoom lens 400 is arranged between the image planes 121 of image-forming objective lens 120 and image-forming objective lens, and described liquid zoom lens 400 is also equipped with the corresponding driving device (not indicating in figure) for focusing altogether; Described receiving device 130 is CCD.
The light sent by light source incides observer's eyes through the reflection of even light microscopic transmission 110, half-reflecting half mirror 300 and after connecing order object lens 110 transmission successively; The light entering observer's eyes is by outgoing after fundus reflex, and XianCheng's intermediary image after connecing order object lens 110 and collecting, then is imaged onto intermediary image on receiving device 130 by image-forming objective lens 120, eventually passes display device display 140 out.
The disclosed fundus camera imaging system based on liquid lens focusing type of the present embodiment, version-employing mechanical focusing mode, meets the requirement to different diopter human eye blur-free imaging by the position of adjustment image planes.Compared to focusing structure, mechanical focusing needs to design cam curve, thus has more complicated version, and has higher requirement for operator's skilled operation degree.The mode that version two utilizes voltage to focus replaces mechanical focusing, introduces liquid zoom lens in imaging systems.The surface curvature of liquid lens can be continuously changed by regulation voltage, realize the human eye blur-free imaging to different diopter.This focusing mode only need adopt the mechanical structure form focused, and frame for movement is simple, requires also lower to operator proficiency level, and can realize regulating more accurately by continuously changing lens surface curvature.
Liquid zoom lens is made up of one or more liquid, and change the lens of focal length by changing surface curvature.Compared to traditional form of lens, the maximum feature of liquid lens is exactly that focal length is variable.The focal length of liquid lens is changed at present mainly through electric power law and mechanical force method two kinds of methods.Electric power law is utilize a kind of new features to be called surface tension that " electricity infiltrate " changes liquid, and the method for mechanical force be by directly on the lens body reinforcing make lens shape produce physical deformation.The company of current production liquid lens is primarily of Philips and French varioptic.The ARCTIC 416SLV3 series of fluids lens that the present invention selects French varioptic company to produce are as the ingredient of designed imaging system.。The regulating power of ARCTIC 416SLV3 series of fluids lens is as shown in table 1:
Table 1 optical parametric is with change in voltage table
Utilize CODE V to carry out modeling to liquid zoom lens, obtain the optical texture of liquid zoom lens as shown in Figure 2.The part of the liquid lens of ARCTIC416SLV3 model as the fundus camera imaging system based on liquid lens focusing type of the present invention is designed, consider cost, the CCD that receiving device still selects the imaging system based on mechanical focusing mode to use, the design objective of system is specifically as shown in table 2:
Table 2 is based on the imaging system design parameter of liquid lens focusing mode
The liquid lens of ARCTIC 416SLV3 model is added in the last of imaging system, as last element before receiving device 130, the aberration of compensating image system and the picture element change caused by different diopter, utilize the multiplet of CODE V to arrange 8 weight structures to diopter from-8D to+10D, the imaging system structure finally obtained as shown in Figure 3.
The systematic parameter of final design result under different human eye diopter is as shown in table 3:
Part system structural parameters in table 3 visible spectrum
As seen from the above table, imaging system no longer needs to carry out mechanical focusing.
Embodiment further, as shown in Figure 3, described based in the fundus camera imaging system of liquid lens focusing type, also comprise the aperture diaphragm 500 connect described in being arranged between order object lens 110 and observer's eyes; Described light source 210 is visible light source or infrared light light source.
To normal eye, the MTF curve of imaging system as shown in Figure 4, wherein MTF(Modulation Transfer Function) be modulation transfer function (MTF).As can be seen from the figure, the mtf value of imaging system is greater than 0.2 at 120lp/mm place, meets requirement of system design.Obtain after tested, the fundus camera imaging system based on liquid lens focusing type of the present invention is all less than 6% to the distortion value of normal eye under each visual field, meets requirement of system design.For other diopter human eyes, by regulating the surface curvature of liquid lens to carry out aberration correction, similar all to normal eye of the MTF curve of each weight structure and distortion curve.
In sum, a kind of fundus camera imaging system based on liquid lens focusing type provided by the present invention, comprises imaging subsystems and illumination subsystems; Described imaging subsystems is made up of connect order object lens, image-forming objective lens, receiving device and the display device set gradually; Illumination subsystems by light source, even light microscopic and connect order object lens composition; Described illumination subsystems and described imaging subsystems are coupled together by half-reflecting half mirror; Also comprise for passing through to regulate input voltage determination lens surface curvature or the liquid zoom lens by being added on the mechanical force determination lens surface curvature on lens mirror body in described fundus camera imaging system, described liquid zoom lens is arranged between image-forming objective lens and the image planes of image-forming objective lens, and described liquid zoom lens is also equipped with the corresponding driving device for focusing altogether; Described receiving device is CCD; The light sent by light source incides observer's eyes through the reflection of even light microscopic transmission, half-reflecting half mirror and after connecing the transmission of order object lens successively; The light entering observer's eyes is by outgoing after fundus reflex, and XianCheng's intermediary image after connecing order object lens and collecting, then is imaged onto on receiving device by image-forming objective lens by intermediary image, eventually passes display device and show.The present invention introduces liquid zoom lens in imaging systems, the surface curvature of the mechanical force liquid lens on lens mirror body is added on by change input voltage or change, realize the human eye blur-free imaging to different diopter, its frame for movement is simple, to operator proficiency level require lower, need not specialty doctor or nurse operate.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the present invention.
Claims (5)
1. based on a fundus camera imaging system for liquid lens focusing type, it is characterized in that, comprise imaging subsystems and illumination subsystems;
Described imaging subsystems is made up of connect order object lens, image-forming objective lens, receiving device and the display device set gradually;
Illumination subsystems by light source, even light microscopic and connect order object lens composition;
Described illumination subsystems and described imaging subsystems are coupled together by half-reflecting half mirror;
Also comprise for passing through to regulate input voltage determination lens surface curvature or the liquid zoom lens by being added on the mechanical force determination lens surface curvature on lens mirror body in described fundus camera imaging system, described liquid zoom lens is arranged between image-forming objective lens and the image planes of image-forming objective lens, and described liquid zoom lens is also equipped with the corresponding driving device for focusing altogether; Described receiving device is CCD;
The light sent by light source incides observer's eyes through the reflection of even light microscopic transmission, half-reflecting half mirror and after connecing the transmission of order object lens successively; The light entering observer's eyes is by outgoing after fundus reflex, and XianCheng's intermediary image after connecing order object lens and collecting, then is imaged onto on receiving device by image-forming objective lens by intermediary image, eventually passes display device and show.
2. according to claim 1 based on the fundus camera imaging system of liquid lens focusing type, it is characterized in that, also comprise the aperture diaphragm connect described in being arranged between order object lens and observer's eyes.
3. according to claim 1 based on the fundus camera imaging system of liquid lens focusing type, it is characterized in that, described liquid zoom lens is ARCTIC 416SLV3 model liquid lens.
4. according to claim 1 based on the fundus camera imaging system of liquid lens focusing type, it is characterized in that, described light source is visible light source.
5. according to claim 1 based on the fundus camera imaging system of liquid lens focusing type, it is characterized in that, described light source is infrared light light source.
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| CN201410781071.XA CN104523221A (en) | 2014-12-17 | 2014-12-17 | Eye ground camera imaging system based on liquid lens focusing |
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Cited By (6)
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| CN105259154A (en) * | 2015-11-05 | 2016-01-20 | 南开大学 | Drug detection device |
| CN107115099A (en) * | 2017-03-29 | 2017-09-01 | 广州医软智能科技有限公司 | A kind of microcirculation of nail rugae imaging device |
| CN108294726A (en) * | 2017-01-12 | 2018-07-20 | 天津工业大学 | Binocular fundus camera imaging optical system |
| CN108309228A (en) * | 2017-01-16 | 2018-07-24 | 天津工业大学 | portable fundus camera optical system |
| CN108498064A (en) * | 2018-03-19 | 2018-09-07 | 中国人民解放军空军航空医学研究所 | Digitize bright spot scintillation detection system |
| CN111035360A (en) * | 2019-12-28 | 2020-04-21 | 重庆贝奥新视野医疗设备有限公司 | Binocular fundus camera and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111035360A (en) * | 2019-12-28 | 2020-04-21 | 重庆贝奥新视野医疗设备有限公司 | Binocular fundus camera and working method thereof |
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Application publication date: 20150422 |