CN208876483U - Fundus camera optical system is imaged in Portable stereoscopic - Google Patents
Fundus camera optical system is imaged in Portable stereoscopic Download PDFInfo
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- CN208876483U CN208876483U CN201820068369.XU CN201820068369U CN208876483U CN 208876483 U CN208876483 U CN 208876483U CN 201820068369 U CN201820068369 U CN 201820068369U CN 208876483 U CN208876483 U CN 208876483U
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Abstract
一种便携式立体成像眼底相机光学系统，包括网膜物镜、场镜、半反半透镜、前置物镜、成像物镜、成像芯片和照明装置；网膜物镜、场镜、前置物镜均与主光轴垂直，半反半透镜与主光轴之间的夹角为30‑60°，主光线在场镜后表面被分成两对称倾斜子光路A1和A2，两倾斜子光路A1和A2之间的夹角a为11°，一个成像物镜和一个成像芯片构成一个成像组，最上方的成像组中的成像物镜、成像芯片依次设置在第一子光轴A1上，最下方的成像组中的成像物镜、成像芯片依次设置在第二子光轴A2上，照明装置的输出光路与半反半透镜之间的夹角为45°。本实用新型解决了现有的单目眼底相机无法在同一时刻获取一组图像的问题，并实现眼底相机的小型化与便携。
A portable stereo imaging fundus camera optical system, comprising a retina objective lens, a field lens, a half mirror and a half mirror, a front objective lens, an imaging objective lens, an imaging chip and an illumination device; The axis is vertical, the angle between the half mirror and the main optical axis is 30-60°, the main ray is divided into two symmetrically inclined sub-optical paths A 1 and A 2 on the rear surface of the field mirror, and the two inclined sub-optical paths A 1 and A 2 The included angle a between them is 11°, an imaging objective lens and an imaging chip form an imaging group, the imaging objective lens and imaging chip in the topmost imaging group are sequentially arranged on the first sub-optical axis A1, and the bottommost imaging group is The imaging objective lens and the imaging chip in the group are arranged on the second sub-optical axis A2 in sequence, and the included angle between the output light path of the lighting device and the half mirror and half mirror is 45°. The utility model solves the problem that the existing monocular fundus camera cannot acquire a group of images at the same time, and realizes the miniaturization and portability of the fundus camera.
Description
Technical field
The utility model belongs to the micro- imaging in eyeground and eyeground three-dimensional reconstruction field, and in particular to Portable stereoscopic imaging
Fundus camera optical system.
Background technique
People, which have 80% from the extraneous process for obtaining information by sense organ, to be completed by eyes.Human eyes structure essence
Thin and complicated, eyeground is important component therein.In clinical examination, for eye part disease, eyeground is first checked for, observation has
Without lesion, correctly to judge the cause of disease.The lesion on eyeground is maintained close ties with and is influenced each other with whole body other systems disease.Many diseases
It is all showed on eyeground.According to some features on eyeground, other clinical specialities can be assisted to make correct diagnosis.Other
The early symptom of disease appears in eye, and funduscopy can make these diseases obtain in due course treatment.Human eye is rich in many micro-
Thin blood vessel is the fine vascular position that human body can most observe directly, therefore is also the significant points of microcirculation in human body research.
Human eye retina, also known as eyeground are the films of one layer of high level of architectural complexity, are the important components of human eye.Depending on
Status of the nethike embrane in eyes is equivalent to the receiver of imaging system.Eyeground is this sensory important group of eyes
At part, most of lesion of eyes comes from eyeground.Eyeground is dispersed with a large amount of various artery and vein vasculars simultaneously, these blood vessels can
To reflect the state of system vascular disease.Such as hypertension, arteriovenous thrombus, arteriosclerosis fracture, ephritis and tumour disease
Disease can make these diseases according to the variation symptom on eyeground by the observation analysis to eyeground choroid and retina
Early diagnosis and prevention.And retinal vessel is also cerebrovascular branch, can speculate cerebrovascular situation from it.Eyeground phase
Machine is the Ophthalmologic apparatus for being checked eyeground pathological changes, is a kind of important means that doctor carries out dynamic retinoscopy,
Clinically have important application.
Since the two dimensional image that fundus camera generates can not show the sky of three-dimensional eye ground image realisticly
Between relationship, thus bring some inconvenience to diagnosis.The three-dimensional reconstruction of eye fundus image can be by two-dimensional medical imaging data
True sensory effects show diagnostic personnel, compensate for existing medical imaging equipment imaging when be lost third dimension information
The shortcomings that, allow size, spatial position, the geometry of the observing eye bottom lesion that medical worker is more accurate, is more clear
And its relationship with surrounding other institutional frameworks, multi-angle, multi-level observation can be carried out to the institutional framework at patient's eyes bottom,
To greatly reduce subjective judgement and the clinical experience deficiency because of medical worker and the adverse effect caused by diagnostic result.
Doctor can also be assisted to carry out qualitative and quantitative analysis to patient's eyeground pathological changes by eye fundus image three-dimensional reconstruction, to make medical treatment
The utility value of image documentation equipment output 2-D data is played to the greatest extent, the accuracy of diagnosis is improved, to improve doctor
Treat diagnostic level.
More for the method type of eye fundus image three-dimensional reconstruction at present, research discovery by contrast uses binocular stereo vision
Method carry out that eye fundus image reconstruction accuracy is relatively high, be the method for most advantage at present.Utilize the side of machine vision
The three-dimensional reconstruction matter of utmost importance that method carries out eye fundus image is the eye fundus image for obtaining the condition that meets, and how to obtain human eye in same a period of time
Inscribing one group of eye fundus image with overlapping region is to need key problems-solving.Fundus camera is monocular system at present,
Although monocular fundus camera technology mature, one group of image, three-dimensional imaging fundus camera skill can not be obtained in synchronization
Art is in space state, therefore it is very necessary to design a kind of fundus camera optical system that can be realized three-dimensional imaging, to clinic
Medicine and scientific research are all of great significance.
Utility model content
The utility model aim is: it is intended to provide Portable stereoscopic imaging fundus camera optical system, it is existing to solve
Monocular fundus camera can not the problem of synchronization obtains one group of image, and realize the miniaturization of fundus camera with it is portable.
To realize the above-mentioned technical purpose, the technical solution adopted in the utility model is as follows:
Fundus camera optical system, including nethike embrane object lens, field lens, half-reflection and half-transmission is imaged in the Portable stereoscopic of the utility model
Mirror, pre-objective, image-forming objective lens, imager chip and lighting device；The nethike embrane object lens, field lens, half-reflecting half mirror and preposition
Object lens are successively set on primary optical axis, and nethike embrane object lens, field lens, pre-objective are vertical with primary optical axis, half-reflecting half mirror and key light
Angle between axis is 30-60 °；The rear end of pre-objective forms inclination sub-light road A1With inclination sub-light road A2, tilt sub-light road A1
With inclination sub-light road A2About key light axial symmetry, and tilt sub-light road A1、A2Between angle a be 10-12 °, it is described two inclination son
Optical path A1And A2Inclination vertex in field lens rear surface；Tilt sub-light road A1With inclination sub-light road A2On be respectively set by one at
As the imaging group that object lens and an imager chip are constituted, two imaging groups are about key light axial symmetry, in an imaging group of top
Image-forming objective lens, imager chip be successively set on inclination sub-light road A1On, image-forming objective lens in another imaging group of lower section, at
As chip is successively set on inclination sub-light road A2On, the angle between the output light path and half-reflecting half mirror of the lighting device is
30-60°。
Utility model by adopting the above technical scheme, the first Cheng Yici on the field lens after nethike embrane object lens of the picture of human eye retina
Real image, the real image on field lens are irradiated on pre-objective through half-reflecting half mirror, become collimated light beam through pre-objective and project
Two symmetrical inclination sub-light road A1And A2On, be arranged in image-forming objective lens on two symmetrical inclination sub-light roads by the picture of retina respectively at
On picture to respective imager chip, two symmetrical inclination sub-lights roads are placed with identical image-forming objective lens respectively and core are imaged
Piece, and tilt sub-light road A1With inclination sub-light road A2Between angle a it is adjustable between 10 °~12 °, two symmetrical inclination sub-light roads
Image quality it is identical and formed two images have subtense angle on two imager chips, to realize simultaneously from two
Different angle shoots the purpose of same eye ground image, can be realized binocular stereo imaging, grinds to clinical medicine and science
Study carefully and is all of great significance.
Further, the rear focus of the nethike embrane object lens is located at field lens, i.e. real image face and field lens formed by nethike embrane object lens
It is overlapped.Such design, image quality are preferable.
Further, the field lens is located at the intermediate region of nethike embrane object lens and half-reflecting half mirror.Such design, imaging effect
It is more satisfactory.
Further, imaging beam can be become collimated light beam by the pre-objective.Such design is conducive to mentioning for image quality
It is high.
Further, the two inclinations sub-light road A1And A2About key light axial symmetry.Such design is ensuring image quality
On the basis of, simplied system structure can reduce production cost to a certain extent.
Further, the two inclinations sub-light road A1And A2Between angle a it is adjustable between 10 °~12 °.Such design,
The angle between two inclination sub-light roads can arbitrarily changed in ideal range, adjusted between two inclination sub-light roads on demand
Distance, the scope of application is wider, design it is relatively reasonable.
Further, the nethike embrane object lens, field lens, half-reflecting half mirror, pre-objective, image-forming objective lens are spheric glass.This
The design of sample, nethike embrane object lens, field lens, half-reflecting half mirror, pre-objective, image-forming objective lens do not have paraboloid and irregular mirror surface,
Manufacture easy to produce, production cost is low, and precision is higher.
Further, the image-forming objective lens are intense light irradiation camera object lens or Zoom camera object lens, the imager chip
For CCD or CMOS.Such design, not only imaging effect is preferable, but also processing speed is very fast, shortens to a certain extent double
The time of mesh three-dimensional imaging.
Further, Portable stereoscopic imaging fundus camera optical system is to exempt from mydriasis fundus camera optical system,
The Portable stereoscopic imaging fundus camera optical system overall length is less than 250mm, and the lighting device is using coaxial
Lighting method.Such design, applicable pupil range is wider, so as to for the binocular solid on many people eyeground at
Picture；And optical system size is smaller, can be convenient the carrying of instrument and equipment, and medical staff is facilitated to use；And lighting device uses
Coaxial illumination mode may further ensure that the uniformity of illumination, improve the quality of imaging.
Detailed description of the invention
The utility model can be further illustrated by the nonlimiting examples that attached drawing provides；
Fig. 1 is the structural schematic diagram that fundus camera optical system embodiment is imaged in the utility model Portable stereoscopic；
Fig. 2 is that light beam seperated schematic diagram in fundus camera optical system embodiment is imaged in the utility model Portable stereoscopic；
Fig. 3 is the modulation transfer function that fundus camera optical system embodiment is imaged in the utility model Portable stereoscopic
(MTF) curve graph；
Fig. 4 is the curvature of field and distortion curve that fundus camera optical system embodiment is imaged in the utility model Portable stereoscopic
Figure；
Symbol description in diagram is as follows:
1. nethike embrane object lens, 2. field lenses, 3. half-reflecting half mirrors, 4. pre-objectives, 5. image-forming objective lens, 6. imager chips, 7. are shone
Bright device.
Specific embodiment
It is right with reference to the accompanying drawings and examples in order to make those skilled in the art that the utility model may be better understood
Technical solutions of the utility model further illustrate.
As depicted in figs. 1 and 2, fundus camera optical system, including nethike embrane object is imaged in the Portable stereoscopic of the utility model
Mirror 1, field lens 2, half-reflecting half mirror 3, pre-objective 4, image-forming objective lens 5, imager chip 6 and lighting device 7；The nethike embrane object lens
1, field lens 2, half-reflecting half mirror 3 and pre-objective 4 are successively set on primary optical axis, and nethike embrane object lens 1, field lens 2, pre-objective 4 are equal
Vertical with primary optical axis, the angle between half-reflecting half mirror 3 and primary optical axis is 45 °；The rear end of pre-objective forms inclination sub-light road
A1With inclination sub-light road A2, tilt sub-light road A1With inclination sub-light road A2About key light axial symmetry, and tilt sub-light road A1、A2Between
Angle a be 11 °, it is described two inclination sub-light road A1And A2Inclination vertex field lens 2 rear surface；Tilt sub-light road A1With incline
Oblique sub-light road A2On be respectively set the imaging group being made of an image-forming objective lens 5 and an imager chip 6, two imaging groups about
Key light axial symmetry, image-forming objective lens 5, imager chip 6 in an imaging group of top are successively set on inclination sub-light road A1On, under
Image-forming objective lens 5, imager chip 6 in another imaging group of side are successively set on inclination sub-light road A2On, the lighting device 7
Output light path and half-reflecting half mirror 3 between angle be 45 °.
When angle between half-reflecting half mirror 3 and primary optical axis is 30 °, the output light path and half-reflecting half mirror 3 of lighting device 7
Between angle be 60 °；If the angle between half-reflecting half mirror 3 and primary optical axis is 60 °, the output light path of lighting device 7
Angle between half-reflecting half mirror 3 is 30 °, and above-mentioned angle is mutually remaining two-by-two.
In the present embodiment, the distance between human eye retina e and nethike embrane object lens 1 are at least 10mm, the picture of human eye retina
The first Cheng Yici real image at the field lens 2 of nethike embrane object lens 1, the diameter of real image is between 10-20mm, and the real image on field lens 2 is through half
Anti- pellicle mirror 3 is irradiated on pre-objective 4, becomes collimated light beam through pre-objective 4 and project symmetrically arranged two-way respectively inclining
Oblique sub-light road A1And A2On, the image-forming objective lens 5 being arranged on oblique sub-light road are by the picture of retina and are imaged onto respective imaging respectively
On chip 6, sub-light road A is tilted1With inclination sub-light road A2It is upper to be placed with identical image-forming objective lens 5 and imager chip 6 respectively,
And inclination sub-light road A1With inclination sub-light road A2Between angle a it is adjustable between 10 °~12 °, two symmetrical inclination sub-light roads at
Image quality amount is identical and formed two images have subtense angle on two imager chips 6, thus realize simultaneously from two not
With the purpose of the same eye ground image of angle shot, binocular stereo imaging can be realized, to clinical medicine and scientific research
All it is of great significance.
The rear focus and field lens 2 of nethike embrane object lens 1 coincide with real image face, and image quality is preferable at this time.That is the position of field lens 2
At the rear focus of nethike embrane object lens 1, i.e., real image face formed by nethike embrane object lens 1 is overlapped with field lens 2, can also be according to the actual situation
The specific relationship considered between field lens 2 and the rear focus of nethike embrane object lens 1.
Likewise, the position of field lens 2 is the object focus of pre-objective 4 simultaneously, at this time light by pre-objective at
As effect is best；The relationship between field lens 2 and the object focus of pre-objective 4 can also be specifically considered according to the actual situation.
Imager chip (6) be arranged at the rear focus of image-forming objective lens (5), thus on imager chip at clearly as,
Position between two imager chips and corresponding image-forming objective lens can also be adjusted according to the actual situation.
Field lens 2 is located at the intermediate region of nethike embrane object lens 1 and half-reflecting half mirror 3, and such imaging effect is more satisfactory.It can also root
According to the specific specific location for considering field lens 2 between nethike embrane object lens 1 and half-reflecting half mirror 3 of actual needs.
Imaging beam can be become collimated light beam by pre-objective 4, be conducive to the raising of image quality.In fact, can also basis
Actual needs is specific to consider whether pre-objective 4 needs imaging beam becoming collimated light beam.
Two inclination sub-light road A1And A2About key light axial symmetry, two symmetrical inclination sub-light road A1And A2It can be with about primary optical axis
Bilateral symmetry can also be symmetrical above and below, can be on the basis of ensuring image quality, and simplied system structure can be to a certain degree
Upper reduction production cost can also specifically consider two inclination sub-light road A according to actual needs1And A2Whether about key light axial symmetry.
Two inclination sub-light road A1And A2Between angle a it is adjustable between 10 °~12 °.Such design, can be more
Arbitrarily change the angle between two inclination sub-light roads in ideal range, to adjust the distance between two inclination sub-light roads on demand, fits
It is wider with range, it designs relatively reasonable.Optimal is selected as 11 °, can also specifically consider the model of angle a according to the actual situation
It encloses.
Nethike embrane object lens 1, field lens 2, half-reflecting half mirror 3, pre-objective 4, image-forming objective lens 5 are spheric glass, nethike embrane object lens
1, field lens 2, half-reflecting half mirror 3, pre-objective 4, image-forming objective lens 5 are without paraboloid and irregular mirror surface, manufacture easy to produce,
Production cost is low, and precision is higher.In fact, can also specifically consider nethike embrane object lens 1, field lens 2, half-reflection and half-transmission according to the actual situation
The type of mirror 3, pre-objective 4, image-forming objective lens 5.
Image-forming objective lens 5 are intense light irradiation camera object lens or Zoom camera object lens, and imager chip 6 is CCD or CMOS.It is such
Design, not only imaging effect is preferable, but also processing speed is very fast, shortens the time of binocular stereo imaging to a certain extent.
In fact, can also specifically consider the type of image-forming objective lens 5 and imager chip 6 according to the actual situation.
Portable stereoscopic imaging fundus camera optical system is to exempt from mydriasis fundus camera optical system, the Portable standing
Body is imaged fundus camera optical system overall length and is less than 250mm, and the lighting device 7 uses coaxial illumination mode.In this way
Design, applicable pupil range is wider, so as to the binocular stereo imaging for many people eyeground；And optical system ruler
It is very little smaller, it can be convenient the carrying of instrument and equipment, medical staff facilitated to use；And lighting device 7 uses coaxial illumination mode, it can
To further ensure that the uniformity of illumination, improve the quality of imaging.In fact, can also specifically consider according to the actual situation portable
Whether formula three-dimensional imaging fundus camera exempts from the lighting method of mydriasis and lighting device 7.
As shown in figure 3, in the MTF curve of the utility model Portable stereoscopic imaging fundus camera optical system, it is each to regard
The mtf value of field is all larger than 0.2 at 150lp/mm, meets China " ophthalmological instrument eyeground pharmaceuticals industry standard YY0634-2008
Camera " as defined in image resolution ratio be greater than the technical requirements of 80lp/mm, and the transfer curve trend of each visual field is flat
Sliding, image quality is preferable.
Optical system there are each point that when curvature of field, cannot make on a biggish planar object simultaneously in same image planes at
Sharply defined image, since imager chip 6 requires image planes must in the same plane, therefore the curvature of field needs very little.Field curve as shown in Figure 4
It can be seen that curvature of field value is up to 0.012mm, planar imaging requirement is complied fully with.The presence of distortion makes chief ray pass through optical system
It is not equal to ideal image height after system with the intersection height of Gauss image planes, makes to cause image distortion as losing similitude relative to object.By
Distortion curve shown in Fig. 4 can be seen that distortion value maximum is only -2.5%, therefore image is without obvious distortion phenomenon.
In summary, the Portable stereoscopic imaging fundus camera optical system of the utility model design can be from two differences
Angle shoots same eye ground photo simultaneously, and image quality has reached the pharmaceuticals industry standard YY0634- of China's formulation
The standard of 2008 " ophthalmological instrument fundus camera " defineds, and it is better than this standard.
Above-described embodiment is merely exemplary to illustrate the principle and effect of the utility model, and not for limitation, this is practical new
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, all those of ordinary skill in the art are without departing from the revealed spirit of the utility model
With all equivalent modifications completed under technical idea or change, should be covered by the claim of the utility model.
Claims (9)
1. fundus camera optical system is imaged in a kind of Portable stereoscopic, it is characterised in that: including nethike embrane object lens (1), field lens (2),
Half-reflecting half mirror (3), pre-objective (4), image-forming objective lens (5), imager chip (6) and lighting device (7)；The nethike embrane object
Mirror (1), field lens (2), half-reflecting half mirror (3) and pre-objective (4) are successively set on primary optical axis, nethike embrane object lens (1), field lens
(2), pre-objective (4) is vertical with primary optical axis, and the angle between half-reflecting half mirror (3) and primary optical axis is 30-60 °；Preceding glove
The rear end of mirror forms inclination sub-light road A1With inclination sub-light road A2, tilt sub-light road A1With inclination sub-light road A2About primary optical axis pair
Claim, and tilts sub-light road A1、A2Between angle a be 10-12 °, it is described two inclination sub-light road A1And A2Inclination vertex in field lens
(2) rear surface；Tilt sub-light road A1With inclination sub-light road A2On be respectively set by an image-forming objective lens (5) and an imager chip
(6) the imaging group constituted, image-forming objective lens (5), imaging of two imaging groups about key light axial symmetry, in an imaging group of top
Chip (6) is successively set on inclination sub-light road A1On, image-forming objective lens (5), imager chip (6) in another imaging group of lower section
It is successively set on inclination sub-light road A2On, the angle between the output light path and half-reflecting half mirror (3) of the lighting device (7) is
30-60°。
2. fundus camera optical system is imaged in Portable stereoscopic according to claim 1, it is characterised in that: the field lens
(2) position is at the rear focus of nethike embrane object lens (1), i.e., real image face formed by nethike embrane object lens (1) is overlapped with field lens (2)；And
The position of field lens (2) is the object focus of pre-objective (4) simultaneously；The image space coke in image-forming objective lens (5) is arranged in imager chip (6)
At point.
3. fundus camera optical system is imaged in Portable stereoscopic according to claim 1, it is characterised in that: described half anti-half
Lens (3) are located at region between field lens (2) and pre-objective (4).
4. fundus camera optical system is imaged in Portable stereoscopic according to claim 1, it is characterised in that: the preceding glove
Mirror (4) is located between half-reflecting half mirror (3) and image-forming objective lens (5), and imaging beam becomes collimated light beam after pre-objective (4)
It projects at image-forming objective lens (5).
5. fundus camera optical system is imaged in Portable stereoscopic according to claim 1, it is characterised in that: described two is symmetrical
Tilt sub-light road A1And A2Inclination vertex in field lens (2) rear surface, and two symmetrical inclination sub-light road A1And A2It can about primary optical axis
With symmetrically can also be symmetrical above and below.
6. fundus camera optical system is imaged in Portable stereoscopic according to claim 5, it is characterised in that: inclination
Optical path A1With inclination sub-light road A2Between included angle a be 11 °.
7. fundus camera optical system is imaged in Portable stereoscopic according to claim 1, it is characterised in that: the imaging
Object lens (5) are strong light image-forming objective lens or varifocal imaging object lens, and the imager chip (6) is CCD or CMOS.
8. fundus camera optical system is imaged in Portable stereoscopic according to claim 1, it is characterised in that: described is portable
Formula three-dimensional imaging fundus camera optical system is to exempt from mydriasis fundus camera optical system, and eyeground phase is imaged in the Portable stereoscopic
Machine optical system overall length is less than 250mm.
9. fundus camera optical system is imaged in Portable stereoscopic according to claim 1, it is characterised in that: half-reflecting half mirror
(3) angle between primary optical axis is 45 °, and the angle between the output light path and half-reflecting half mirror (3) of lighting device (7) is
45°。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108577801A (en) * | 2018-01-16 | 2018-09-28 | 天津工业大学 | Portable stereoscopic is imaged fundus camera optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108577801A (en) * | 2018-01-16 | 2018-09-28 | 天津工业大学 | Portable stereoscopic is imaged fundus camera optical system |
| CN108577801B (en) * | 2018-01-16 | 2023-12-01 | 天津工业大学 | Portable stereoscopic imaging fundus camera optical system |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190521 Effective date of abandoning: 20231201 |