CN102657515B - Alignment light path device applied to retinal imaging system - Google Patents
Alignment light path device applied to retinal imaging system Download PDFInfo
- Publication number
- CN102657515B CN102657515B CN201210142714.7A CN201210142714A CN102657515B CN 102657515 B CN102657515 B CN 102657515B CN 201210142714 A CN201210142714 A CN 201210142714A CN 102657515 B CN102657515 B CN 102657515B
- Authority
- CN
- China
- Prior art keywords
- group
- retinal
- nethike embrane
- object lens
- mirror
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The invention discloses an alignment light path device applied to a retinal imaging system and belongs to the field of medical optical instruments and biometric identification. The invention aims to solve the problem that the marginal definition of retinal pictures is reduced because the working distance cannot be ensured to be a design value in the prior art. The device comprises a retinal objective fixation group, a retinal objective zooming group, a switching lens group, a hollow reflective mirror, a first relay lens, a first reflective board, a second relay lens and a near infrared photodetector, wherein the switching lens group is arranged between the retinal objective fixation group and the retinal objective zooming group, and an optical signal sent by an iris sequentially passes through the retinal objective fixation group, the retinal objective zooming group, the switching lens group, the hollow reflective mirror, the first relay lens, the first reflective board and the second relay lens, and is received by the near infrared photodetector; the switching lens group comprises a switching lens front group, a double optical wedge and a switching lens rear group; and the double optical wedge is a combination of two optical wedges which are arranged in parallel and have opposite inclined directions. An alignment method is high in adjusting accuracy, and can be widely applied to retinal imaging systems.
Description
Technical field
The optical system for alignment device that the present invention relates to be applied to retina imaging system, belongs to medical optical instrument, field of biological recognition.
Background technology
Retina image-forming technology is widely used in the fields such as medical treatment and biological identification gradually.Medically, retinopathy is surveyed in time, followed the tracks of, can play effective diagnosis, forewarning function to various diseases.In field of biological recognition, retina has far more than the biological characteristic of fingerprint, palmmprint etc., can greatly improve accuracy of identification; And retina gos deep into optical fundus, be not easy to be obtained by the external world, there is very high confidentiality.
Retina image-forming instrument comprises imaging optical path, illumination path and three necessary ingredients of location light path, and wherein imaging optical path and location light path need to be designed to Zoom structure, and synthetic operation, in order to realize different diopter human eye retinas' blur-free imaging.Compare with conventional Image-forming instrument, retina image-forming optical system need to the part using opthalmic optics's system as this light path be optimized design in design, therefore, retina imaging system, before carrying out retina shooting, first will guarantee that retina image-forming optical system and opthalmic optics's system realize pupil and be connected.Realizing pupil linking has two requirements, and the one, the entrance pupil of imaging optical system and the pupil of human eye are coaxial, and the one, the operating distance (being entrance pupil and the oculopupillary spacing of people of imaging optical system) that makes imaging system is design load.
Patent US7025459 is that a portable retina is taken camera.The front end of this camera has added four photodiodes, for surveying the illuminating bundle of iris institute scattering.In the time of the complete incident human eye of illuminating bundle, there is no light by iris scattering, the registration of photodiode is 0, now the pupil of human eye and the entrance pupil of optical system are coaxial, but operating distance and design load have certain deviation, the existence of this deviation can make the marginal definition of captured retina picture decline, and system while using for guaranteeing that photodiode can work, General Requirements darkroom environment.
Patent US7219996 is that a desk-top medical retina is taken camera, and this camera utilizes beam-splitter to separate a road light after nethike embrane object lens, surveys the picture of iris with independent CCD, adjustment camera make iris as clear and be positioned at visual field central authorities.The method can guarantee the entrance pupil of imaging optical system and the pupil of human eye coaxial, but because optical system is all by certain depth of field, when iris imaging is clear, cannot strict guarantee operating distance be still design load, also can make the marginal definition of captured retina picture decline.And the multiplex CCD camera of this scheme, greatly increased cost, volume.
The described retina of prior art is taken in camera and is not used optical system for alignment device.During operation, be by observation, to focus whether the target of location in light path be clear judges that pupil is connected and whether complete.The method complicated operation, error are large, and are unfavorable for realizing automatization.
Summary of the invention
In order solving in existing retina imaging system, cannot to guarantee that operating distance is design load, to make the problem of the marginal definition decline of retina picture, the invention provides the optical system for alignment device that is applied to retina imaging system.
The optical system for alignment device that is applied to retina imaging system provided by the invention, comprises nethike embrane object lens fixedly group, nethike embrane object lens zoom group, switching mirror group, hollow reflecting mirror, the first relay lens, the first reflector, the second relay lens and near infrared light detector; Described nethike embrane object lens are group, nethike embrane object lens zoom group, switching mirror group, hollow reflecting mirror, the first relay lens and the coaxial placement of the first reflector fixedly; Described nethike embrane object lens fixedly arrange between group and nethike embrane object lens zoom group and switch mirror group; The light that iris sends passes through nethike embrane object lens fixedly group, switching mirror group, nethike embrane object lens zoom group, hollow reflecting mirror, the first relay lens and the first reflector successively, light incides the second relay lens by the first reflector after catadioptric 90 °, and light is received by near infrared light detector after by the second relay lens; Group after described switching mirror group comprises the front group of switching mirror, two wedge and switches mirror, and the coaxial placement of three, described pair of wedge is the combination of two wedges that the incline direction of placing arranged side by side is contrary.
Beneficial effect of the present invention: the optical system for alignment device that is applied to retina imaging system of the present invention is centered optical system, its front end has the variable nethike embrane object lens of focal length, these nethike embrane object lens are comprised of the fixing group of nethike embrane object lens and nethike embrane object lens zoom group, the spacing of the fixing group of nethike embrane object lens and nethike embrane object lens zoom group is larger, can insert and switch mirror group.Switch mirror group and formed by group after switching before mirror group, two wedge group and switching mirror, after switching mirror group incision light path, make originally with retina each other the detector of conjugate planes become and iris planar conjugate; Meanwhile, due to the inclined plane effect of two wedges, iris visual field is divided into two parts, to both direction skew, only has when operating distance is design load respectively, and two parts iris visual field just completes splicing.This alignment methods has very high adjustment precision, and operating aspect, regulate with clearly defined objective, for the fully automatic operation of retina imaging system provides judgement target.
Accompanying drawing explanation
Fig. 1 is the structure chart that the present invention is applied to the optical system for alignment device of retina imaging system;
Fig. 2 is two wedge structure charts of optical system for alignment device of the present invention;
Fig. 3 is the fundamental diagram of optical system for alignment device of the present invention;
Fig. 4 is the design index path of optical system for alignment device of the present invention.
The specific embodiment
As shown in Figure 1, the optical system for alignment device that is applied to retina image-forming instrument comprises the fixing group of nethike embrane object lens 1-1, nethike embrane object lens zoom group 1-2, switches mirror group 2, hollow reflecting mirror 3, the first relay lens 4, the first reflector 5, the second relay lens 6 and near infrared light detector 7.The fixing group of nethike embrane object lens 1-1, nethike embrane object lens zoom group 1-2, switching mirror group 2, hollow reflecting mirror 3, the first relay lens 4 and the coaxial placement of the first reflector 5.Between nethike embrane object lens fixing group 1-1 and nethike embrane object lens zoom group 1-2, arrange and switch mirror group 2.The light that iris sends is successively by the fixing group of nethike embrane object lens 1-1, switching mirror group 2, nethike embrane object lens zoom group 1-2, hollow reflecting mirror 3, the first relay lens 4 and the first reflector 5, light incides the second relay lens 6 by the first reflector 5 after catadioptric 90 °, and light is received by near infrared light detector 7 by the second relay lens 6 is rear; Switch after mirror group 2 comprises switching mirror front group 2-1, two wedge 2-2 and switches mirror and organize 2-3, and the coaxial placement of three.
As shown in Figure 2, two wedges are combinations of two wedges that the incline direction of placing arranged side by side is contrary.Due to the inclined plane effect of two wedges, iris visual field is divided into two parts, to both direction skew, only has when operating distance is design load respectively the just complete splicing of two parts iris visual field; After operating distance adjustment completes, adjust the position of camera up and down, when the complete iris of splicing is just positioned at visual field central authorities, imager and human eye are coaxial; The pupil that now completes opthalmic optics's system and imager optical system is connected.
In whole imaging process, the light hole of hollow reflecting mirror 3 is the diaphragm of whole light path, take this diaphragm as the reverse Geometrical Optics of object plane, this diaphragm by the nethike embrane object lens zoom group 1-2 before it, switch to organize after mirror before 2-3 and two wedge 2-2 project two wedge 2-2 and switch mirror and organize between 2-1, form vignette door screen.Owing to being subject to the impact on two wedges inclined plane, light path is two direction generation deviations up and down, form the deficiency of the upper portion of the body diaphragm 8-1 that is positioned at optical axis top and the dificiency in lower-JIAO diaphragm 8-2 that is positioned at optical axis below; Simultaneously according to described in front, the Polaroid image planes that the back plane of two wedges is iris, two wedges are divided into two parts by these Polaroid image planes, respectively corresponding deficiency of the upper portion of the body diaphragm 8-1 and dificiency in lower-JIAO diaphragm 8-2.
As shown in Figure 3, the Polaroid image planes 9 of iris imaging beam is out through deficiency of the upper portion of the body diaphragm 8-1 and dificiency in lower-JIAO diaphragm 8-2, imaging beam is divided into two parts, be respectively imaging beam 12 and lower imaging beam 13, upper imaging beam 12 and lower imaging beam 13 are focused at respectively upper convergent point 14 and the lower convergent point 15 on detector plane 11 after optical system for alignment.Iris is imaging in iris secondary imaging image planes 10 after optical system for alignment.
As shown in Fig. 3 (a), when operating distance equals designed distance, upper imaging beam 12 and lower imaging beam 13 be the upper convergent point 14 on detector plane 11 and 15 coincidences of lower convergent point respectively after optical system for alignment, and the two half range iris picture is completes that caused by two wedges splice; As shown in Figure 3 (b), when operating distance is shorter than designed distance, the upper convergent point 14 of upper imaging beam 12 on detector plane 11 is more than optical axis, the lower convergent point 15 of lower imaging beam 13 on detector plane 11 is below optical axis, be to move on the half range picture that diaphragm 8-1 is corresponding, the half range picture that diaphragm 8-2 is corresponding moves down; As shown in Figure 3 (c), when operating distance is longer than designed distance, the convergent point 14 of imaging beam 12 on detector plane 11 is below optical axis, the convergent point 15 of imaging beam 13 on detector is more than optical axis, be that the half range picture that diaphragm 8-1 is corresponding moves down, on half range picture corresponding to diaphragm 8-2, move.Therefore only have when meeting state shown in Fig. 3 (a), operating distance adjustment completes.After operating distance adjustment completes, iris is blur-free imaging on detector, adjusts up and down camera position, makes iris imaging in the central authorities of detector field of view, and the pupil that has now completed imaging optical system and opthalmic optics's system is connected.
As shown in Figure 4, the design index path of optical system for alignment device of the present invention, after in figure, the secondary imaging image planes 10 of iris are positioned at the first relay lens 4, iris plane 16 is finally imaged in the secondary imaging image planes 10 of iris through each mirror group.Switching mirror group in optical system for alignment device comprises three part mirror groups: after switching mirror front group 2-1, two wedge 2-2 and switching mirror, organize 2-3, three part mirror group surfaces have different optical parametrics.
The switching mirror group three part mirror group design parameters of optical system for alignment device are as follows:
In order to correct aberration, switch the front group of mirror and adopt two gummed eyeglasses, its two eyeglasses are respectively 2-1-1 and 2-1-2; The positioning precision of operating distance is relevant with the size at wedge inclination angle, and inclination angle is larger, and positioning precision is higher; But inclination angle too conference increase system from axle amount, the distortion of iris imaging is increased.Consider above factor, design wedge inclination angle is 10 degree, and can reach ± 0.05mm of operating distance positioning precision guarantees that the amount of distortion that gathers picture is less than 5% simultaneously.
Claims (1)
1. be applied to the optical system for alignment device of retina imaging system, comprise nethike embrane object lens fixedly group (1-1), hollow reflecting mirror (3), the first relay lens (4), the first reflector (5), the second relay lens (6) and near infrared light detector (7), it is characterized in that, this device also comprises nethike embrane object lens zoom group (1-2), switches mirror group (2); Described nethike embrane object lens are group (1-1), nethike embrane object lens zoom group (1-2), switching mirror group (2), hollow reflecting mirror (3), the first relay lens (4) and the coaxial placement of the first reflector (5) fixedly; Described nethike embrane object lens fixedly arrange between group (1-1) and nethike embrane object lens zoom group (1-2) and switch mirror group (2); The light that iris sends passes through nethike embrane object lens fixedly group (1-1), switching mirror group (2), nethike embrane object lens zoom group (1-2), hollow reflecting mirror (3), the first relay lens (4) and the first reflector (5) successively, light incides the second relay lens (6) by the first reflector (5) after catadioptric 90 °, and light is received by near infrared light detector (7) by after the second relay lens (6); Group (2-3) after described switching mirror group (2) comprises the front group (2-1) of switching mirror, two wedge (2-2) and switches mirror, and the coaxial placement of three, described pair of wedge (2-2) is the combination of two wedges that the incline direction of placement is side by side contrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210142714.7A CN102657515B (en) | 2012-05-10 | 2012-05-10 | Alignment light path device applied to retinal imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210142714.7A CN102657515B (en) | 2012-05-10 | 2012-05-10 | Alignment light path device applied to retinal imaging system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102657515A CN102657515A (en) | 2012-09-12 |
| CN102657515B true CN102657515B (en) | 2014-03-12 |
Family
ID=46767190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210142714.7A Expired - Fee Related CN102657515B (en) | 2012-05-10 | 2012-05-10 | Alignment light path device applied to retinal imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102657515B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106618478A (en) * | 2017-01-16 | 2017-05-10 | 中国科学院上海光学精密机械研究所 | Handheld fundus camera with main illuminating rays sharing same light path |
| CN106840615B (en) * | 2017-03-24 | 2023-04-28 | 中国工程物理研究院应用电子学研究所 | Pupil online measurement device based on imaging conjugation and calibration method |
| CN108319015B (en) * | 2017-04-21 | 2023-02-10 | 北京耐德佳显示技术有限公司 | Retina projection type near-to-eye display device |
| CN109782380B (en) * | 2019-03-15 | 2021-05-25 | 苏州思源科安信息技术有限公司 | Iris imaging system and iris identification module |
| CN110236482B (en) * | 2019-05-31 | 2024-03-22 | 中国科学院苏州生物医学工程技术研究所 | Integrated eye and brain visual function imaging system |
| CN110308553B (en) * | 2019-07-29 | 2021-03-02 | 天津大学 | Intermediate infrared imaging optical system for field switching based on micro-lens array |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5475451A (en) * | 1993-01-28 | 1995-12-12 | Yves Robert | Ophthalmologic apparatus |
| EP1210905A2 (en) * | 2000-12-01 | 2002-06-05 | Nidek Co., Ltd. | Fundus camera |
| JP2005087301A (en) * | 2003-09-12 | 2005-04-07 | Canon Inc | Ophthalmologic photographing apparatus |
| CN1706341A (en) * | 2004-06-04 | 2005-12-14 | 佳能株式会社 | Ophthalmic image taking apparatus and ophthalmic image taking method |
| CN1720857A (en) * | 2004-07-15 | 2006-01-18 | 中国科学院光电技术研究所 | Human eye aberration and cornea surface shape measurement system based on microprism array Shack-Hartmann wave front sensor |
| CN101072534A (en) * | 2004-11-08 | 2007-11-14 | 光视有限公司 | Optical apparatus and method for comprehensive eye diagnosis |
| EP2057938A1 (en) * | 2007-11-08 | 2009-05-13 | Nidek Co., Ltd. | Fundus camera |
| CN201379552Y (en) * | 2009-02-27 | 2010-01-13 | 苏州六六视觉科技股份有限公司 | Mydriasis-free eyeground photographing device |
| CN202078293U (en) * | 2011-05-23 | 2011-12-21 | 何伟 | Portable fundus camera |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5605995B2 (en) * | 2009-02-26 | 2014-10-15 | キヤノン株式会社 | Ophthalmic imaging equipment |
-
2012
- 2012-05-10 CN CN201210142714.7A patent/CN102657515B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5475451A (en) * | 1993-01-28 | 1995-12-12 | Yves Robert | Ophthalmologic apparatus |
| EP1210905A2 (en) * | 2000-12-01 | 2002-06-05 | Nidek Co., Ltd. | Fundus camera |
| JP2005087301A (en) * | 2003-09-12 | 2005-04-07 | Canon Inc | Ophthalmologic photographing apparatus |
| CN1706341A (en) * | 2004-06-04 | 2005-12-14 | 佳能株式会社 | Ophthalmic image taking apparatus and ophthalmic image taking method |
| CN1720857A (en) * | 2004-07-15 | 2006-01-18 | 中国科学院光电技术研究所 | Human eye aberration and cornea surface shape measurement system based on microprism array Shack-Hartmann wave front sensor |
| CN101072534A (en) * | 2004-11-08 | 2007-11-14 | 光视有限公司 | Optical apparatus and method for comprehensive eye diagnosis |
| EP2057938A1 (en) * | 2007-11-08 | 2009-05-13 | Nidek Co., Ltd. | Fundus camera |
| CN201379552Y (en) * | 2009-02-27 | 2010-01-13 | 苏州六六视觉科技股份有限公司 | Mydriasis-free eyeground photographing device |
| CN202078293U (en) * | 2011-05-23 | 2011-12-21 | 何伟 | Portable fundus camera |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102657515A (en) | 2012-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102657515B (en) | Alignment light path device applied to retinal imaging system | |
| US11850001B2 (en) | Meta-optics-based systems and methods for ocular applications | |
| US7702225B2 (en) | Devices to facilitate alignment and focusing of a fundus camera | |
| US10595724B2 (en) | Adaptor for an image capture device for fundus photography | |
| CN105581771B (en) | fundus camera | |
| US10194793B2 (en) | Imaging for local scaling | |
| CN102657516B (en) | Automatic retina imaging system | |
| US9993155B2 (en) | Lens module and eye fundus camera using the same | |
| US20180276819A1 (en) | Apparatus and method for evaluating quality of binocular vision of subject | |
| EP3127475A2 (en) | Wide-field retinal imaging system | |
| CN101862178A (en) | Reflection-type confocal scanning retina imaging system based on adaptive optics | |
| JP2022037062A (en) | Wide-angle pupil relay for cellphone-based fundus camera | |
| CN101248981A (en) | Visual optics analysis system based on wave-front abberration | |
| CN102885612A (en) | Fundus imaging equipment for clinical diagnosis | |
| CN102657514B (en) | Portable retinal imager | |
| CN106725293A (en) | Lens module and the fundus imaging equipment using the lens module | |
| KR101780669B1 (en) | binocular capturing device using single camera | |
| CN108897117A (en) | It is a kind of to be split automatically as focusing system and its focusing method | |
| CN102824159B (en) | Automatic diopter adjustment system, equipment and method for fundus OCT (Optical Coherence Tomography) | |
| CN105125177A (en) | Semi-transparent visual guidance glasses for intravenous puncture | |
| US20210145276A1 (en) | Non-mydriatic, non-contact system and method for performing widefield fundus photographic imaging of the eye | |
| CN102028449B (en) | Human eye retina imaging system and method capable of carrying out layered imaging | |
| CN202654103U (en) | Fundus imaging device for clinical diagnosis | |
| CN217744359U (en) | Laser line scanning confocal ophthalmoscope optical imaging system | |
| CN111035360B (en) | Binocular fundus camera and working method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160826 Address after: 130000, A, room 77, block 347, Yingkou Road, Changchun, Jilin, China Patentee after: Changchun Changguang SIPO Spectrum Technology Co., Ltd. Address before: 130033 southeast Lake Road, Jilin, Changchun, No. 3888 Patentee before: Changchun Inst. of Optics and Fine Mechanics and Physics, Chinese Academy of Sci |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20180510 |