CN101953676B - Retina imaging optical system with high resolution and coaxial illumination - Google Patents
Retina imaging optical system with high resolution and coaxial illumination Download PDFInfo
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- CN101953676B CN101953676B CN201010266943A CN201010266943A CN101953676B CN 101953676 B CN101953676 B CN 101953676B CN 201010266943 A CN201010266943 A CN 201010266943A CN 201010266943 A CN201010266943 A CN 201010266943A CN 101953676 B CN101953676 B CN 101953676B
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Abstract
The invention discloses a retina imaging optical system with high resolution and coaxial illumination, comprising a first lens group, a second lens group, a third lens group and a photosensitive chip, wherein the first lens group, the second lens group, the third lens group and the photosensitive chip are sequentially arranged from an objective direction to a lens direction by a common optical shaft; a diaphragm is arranged between the second lens group and the third lens group; and a semitransparent reflective mirror, which is used for transmitting part of rays and reflecting part of rays and forms an angle of 45 degrees with the optical shaft, is arranged between a first lens and a second lens in the first lens group, close to the objective direction. An illumination light path is arranged aside an imaging optical shaft, wherein the rays are reflected into the reflective mirror through a 45-degree reflective mirror surface. The invention provides the optical system with the characteristics of high resolution, large drawing angles, automatic focusing, convenient movement and coaxial illumination.
Description
[technical field]
The present invention relates to a kind of optical system, is the optical system that a novel medical examination is used to take the optical fundus, and this optical system is made up of multi-disc lens, prism, reflecting mirror, sensitive chip and light source.
[background technology]
At present, mostly examination of ocular fundus is with the naked eye to be seen through by the doctor traditional ophthalmoscope direct observation inspection patient's eyes, has not both had objective contrast effect, also is difficult to carry out the information filing management.
The tradition ophthalmoscope adopts non-coaxial-illuminating; Illumination path and observation optical path have a drift angle, cause illumination uniformity poor, but viewing angle are little; The overview angle is about 30 degree; Simultaneously, non-coaxial-illuminating also causes traditional ophthalmoscope under the bigger state of pupil, to use, and often requiring patient will make platycoria could check.
The tradition ophthalmoscope has used 10～20pcs lens to come sectional-regulated focal length for different eyeball sizes and diopter, and the clear effect of its focusing is not as focusing continuously; The tradition ophthalmoscope must switch different magnifieres through the hand rotation rotating disk for the different eyeball back/forth diameter of adult, child patient and different diopters focuses, relatively more inconvenient.
Optical system of the present invention can be automatic, the focusing imaging continuously of eyeball of 14mm～27mm to anteroposterior diameter; Taking the retina angle has reached more than 100 degree; Resolution greater than 800TV Line, reached the definition requirement of 5M still photo and 1080P video, coaxial-illuminating accomplish with taken the photograph picture overlaps, even, do not have a dark angle.The digital photograph of native system imaging is not only objective clear and definite, and takes pictures and also can be used as medical archive, and convenient management is used.Native system is easy to use, can use on common multimedia PC, and operation easily.Image planes imaging size has reached 1/2.5 ", the suitable sensitive chip that adopts cheap ISO.
[summary of the invention]
The present invention has overcome the deficiency of prior art, provide a kind of high-resolution, greatly draw the angle, can focus automatically, convenient move, the optical system of coaxial-illuminating.
In order to solve the technical problem of above-mentioned existence, the present invention adopts related art scheme:
The retina image-forming optical system of high-resolution, coaxial-illuminating is characterised in that from object space to be provided with first lens group, second lens group and the 3rd lens group and sensitive chip successively to mirror side's common optical axis; Between second lens group and the 3rd lens group, be provided with diaphragm; Become near being provided with between first piece of lens of object space and the second piece of lens that a part of light of making of 45 sees through, the translucent reflecting mirror of a part of light reflection at first lens group with optical axis; Be provided with an illumination path on imaging next to axis limit, said illumination path gets into the light reflection in the described reflecting mirror through one 45 ° mirror surface.
The retina image-forming optical system of aforesaid high-resolution, coaxial-illuminating is characterised in that described reflecting mirror is a plane mirror.
The retina image-forming optical system of aforesaid high-resolution, coaxial-illuminating is characterised in that described reflecting mirror is for forming the translucent reflectance coating that on the face of isosceles right triangle prism 45, is coated with by two isosceles right triangle prism gummeds.
The retina image-forming optical system of aforesaid high-resolution, coaxial-illuminating, be characterised in that said first lens group near the focal length of first piece of lens of object space for just.
The retina image-forming optical system of aforesaid high-resolution, coaxial-illuminating, the whole focal length that is characterised in that said the 3rd lens group is for just.
The retina image-forming optical system of aforesaid high-resolution, coaxial-illuminating is characterised in that the relative position between described first lens group, second lens group, the sensitive chip is constant; Said the 3rd lens group can be regulated to realize focusing with the distance of first lens group, second lens group relatively, and said diaphragm moves with the 3rd lens group.
The retina image-forming optical system of aforesaid high-resolution, coaxial-illuminating is characterised in that said illumination path is made up of many pieces of eyeglasses, an annular diaphragm and a light source.
The retina image-forming optical system of aforesaid high-resolution, coaxial-illuminating is characterised in that the internal diameter of said annular diaphragm and external diameter ratio are: 1%-95%.
The present invention compared with prior art has the present invention following advantage is arranged:
1, this optical system has realized high-resolution, trickle blood vessel that can clear inspection optical fundus and nerve etc., and resolution satisfies the resolution requirement of the above sensitive chip of 5M greater than 800TV Line, also satisfies the video capture requirement of full HD (1080P) fully.
2, shooting retina angle of the present invention has reached more than 100 degree, considerably beyond traditional ophthalmoscope.
3, the present invention adopts coaxial-illuminating, and illumination zone covers the imaging scope, and brightness of image does not evenly have dark angle.
4, the present invention adopts coaxial-illuminating, in PD 2mm, just can use, and also makes this camera lens lighting source when cornea tilts the inspection optical fundus relatively be not easy to be blocked by pupil simultaneously.
5, the present invention uses annular diaphragm and eyeglass and prism plating enhancing multilayer film is eliminated the foveal reflex hot spot that coaxial-illuminating causes.
6, this optical system utilizes the 3rd lens group to carry out automatic focus; Can to anteroposterior diameter the eyeball focusing imaging of 14mm～27mm; This size has covered the eyeball size from the premature infant to the adult; Make this optical system have adaptability the most widely, the definition of focusing is far above traditional ophthalmoscope continuously, and focusing has also avoided traditional ophthalmoscope to need the inconvenience of manual switchover camera lens automatically.
7, zoom lens volume adequacy of the present invention, single is hand-holdable use, and conveniently moving.
8, the image planes of this optical system imaging size has reached 1/2.5 ", the suitable sensitive chip that adopts cheap ISO has reduced cost.
[description of drawings]
Fig. 1 is a sketch map of the present invention.
[specific embodiment]
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described in further detail:
The retina image-forming optical system of high-resolution, coaxial-illuminating can be used for the sensor devices such as CMOS sensitive film or ccd chip of high relatively pixel.It comprises being provided with successively from object space and is provided with first lens group 2, second lens group 3 and the 3rd lens group 4 and sensitive chip 6 successively to mirror side's common optical axis.Between second lens group 3 and the 3rd lens group 4, be provided with diaphragm 8.
Specifically, said first lens group 2 near the focal length of first piece of lens 21 of object space for just.The whole focal length of said the 3rd lens group 4 is for just.Relative position between described first lens group 2, second lens group 3, the sensitive chip 6 is constant.Said the 3rd lens group 4 can be regulated to realize focusing with the distance of first lens group 2, second lens group 3 relatively, and said diaphragm 8 moves with the 3rd lens group 4.
Become near being provided with between first piece of lens 21 of object space and the second piece of lens 22 that a part of light of making of 45 sees through, the translucent reflecting mirror 5 of a part of light reflection at first lens group 2 with optical axis.In the present embodiment, described reflecting mirror 5 is a plane mirror, and plane mirror is translucent plane mirror.Certain described reflecting mirror 5 also can be for forming the translucent reflectance coating 51 that on the face of isosceles right triangle prism 45, is coated with by two isosceles right triangle prism gummeds.
In order to strengthen illuminating effect, be provided with an illumination path 10 on imaging next to axis limit, said illumination path 10 gets into the light reflection in the described reflecting mirror 5 through one 45 ° mirror surface 14.Specifically, said illumination path 10 is made up of many pieces of eyeglasses 11, an annular diaphragm 12 and a light source 13.In the present embodiment, the internal diameter of said annular diaphragm 12 and external diameter ratio are: 1%-95%.
The high-resolution of present case, greatly draw the angle, can focus automatically, the optical system of coaxial-illuminating, mainly realize through following method:
1, on a space face, this space face is between first lens group 1 and second lens group 2 retina image-forming for first lens group 1, and this is imaging for the first time, and image planes are bigger than retina, be amplification imaging.
2, second lens group 2 remakes with space image planes that the 3rd lens group 3 is become first lens group and forms images, is imaged onto on the sensitive chip for the second time, and this forms images for the second time is to dwindle into picture.
3, the three lens groups 3 are independently born the function of focusing when bearing the above-mentioned imaging second time, move the 3rd lens group 3 image planes of imaging for the second time are moved, thereby realize the focus function to different-diameter, different diopter eyeballs.
4, between first piece of lens 21 of first lens group and second piece of lens 22, be provided with a reflecting mirror 5, this reflecting mirror 5 can be plane mirror or prism, is prism in the present embodiment.This prism is to be formed by two pieces of isosceles right triangle prism gummeds; The reflectance coating 51 of plating 50% on the cemented surface of 45 degree; Make paraxonic illuminating ray optical axis with the imaging optical axis vertical; The illuminating ray of paraxonic incides on the prismatical 45 degree reflectings surface, through just becoming lighting optical axis and imaging optical axis coincidence after the reflection, reaches coaxial-illuminating.
In addition, on first piece of lens 21 and prism 5, produce the central circular hot spot that can reflect the entering sensitive chip, on the illumination paraxonic, used annular diaphragm 12 in order to eliminate coaxial-illuminating light source 13.Annular diaphragm 12 is equivalent to increase at the center of typical circular diaphragm 5%～90% the circular brake sack that a diameter is former diaphragm external diameter; Making illuminating ray is through an annular opening, can effectively eliminate the coaxial-illuminating light source like this and on first piece of lens 21 and prism 5, produce the central circular hot spot that can reflect the entering sensitive chip.
In present case, adopt wide spectrum during design, and the DESIGN THEORY resolution suitably is higher than theoretical desired value, guaranteed image sharpness and color reducibility.
Lift the actual design case of an optical system below
Two groups and street 62mm;
Three groups and image planes are 5mm～15mm at interval.
Claims (8)
1. the retina image-forming optical system of high-resolution, coaxial-illuminating is characterised in that from object space to be provided with first lens group (2), second lens group (3) and the 3rd lens group (4) and sensitive chip (6) successively to mirror side's common optical axis; Between second lens group (3) and the 3rd lens group (4), be provided with diaphragm (8); Become near being provided with between first piece of lens (21) of object space and the second piece of lens (22) that a part of light of making of 45 sees through, the translucent reflecting mirror (5) of a part of light reflection at first lens group (2) with optical axis; Be provided with an illumination path (10) on imaging next to axis limit, said illumination path (10) gets into the light reflection in the described reflecting mirror (5) through one 45 ° mirror surface (14).
2. the retina image-forming optical system of high-resolution according to claim 1, coaxial-illuminating is characterised in that described reflecting mirror (5) is a plane mirror.
3. the retina image-forming optical system of high-resolution according to claim 1, coaxial-illuminating; Be characterised in that described reflecting mirror (5) is for forming the translucent reflectance coating (51) that on the face of isosceles right triangle prism 45, is coated with by two isosceles right triangle prism gummeds.
4. according to the retina image-forming optical system of claim 1 or 2 or 3 described high-resolution, coaxial-illuminating, be characterised in that said first lens group (2) near the focal length of first piece of lens (21) of object space for just.
5. according to the retina image-forming optical system of claim 1 or 2 or 3 described high-resolution, coaxial-illuminating, the whole focal length that is characterised in that said the 3rd lens group (4) is for just.
6. according to the retina image-forming optical system of claim 1 or 2 or 3 described high-resolution, coaxial-illuminating, be characterised in that the relative position between described first lens group (2), second lens group (3), the sensitive chip (6) is constant; Said the 3rd lens group (4) can be regulated to realize focusing with the distance of first lens group (2), second lens group (3) relatively, and said diaphragm (8) moves with the 3rd lens group (4).
7. according to the retina image-forming optical system of claim 1 or 2 or 3 described high-resolution, coaxial-illuminating, be characterised in that said illumination path (10) is made up of many pieces of eyeglasses (11), an annular diaphragm (12) and a light source (13).
8. the retina image-forming optical system of high-resolution according to claim 7, coaxial-illuminating is characterised in that the internal diameter of said annular diaphragm (12) and external diameter ratio are: 1%-95%.
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| CN201010266943A CN101953676B (en) | 2010-08-22 | 2010-08-22 | Retina imaging optical system with high resolution and coaxial illumination |
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| CN101953676B true CN101953676B (en) | 2012-10-03 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102525402A (en) * | 2012-03-01 | 2012-07-04 | 浙江工业大学 | Optical system and optometry method of computer optometer |
| CN107115096B (en) * | 2017-05-02 | 2019-01-08 | 北京东方新月科技发展有限公司 | Eyeground optical imaging system |
| KR101937187B1 (en) * | 2017-05-11 | 2019-01-14 | 주식회사 에이치비테크놀러지 | Apparatus for detecting error of surface |
| CN108113644A (en) * | 2018-02-01 | 2018-06-05 | 深圳市时代创越科技有限公司 | Fundus imaging optical system |
| CN109044260A (en) * | 2018-07-18 | 2018-12-21 | 苏州精观医疗科技有限公司 | A kind of dark field microscopic imaging device based on optical fiber |
| CN111035359A (en) * | 2019-12-28 | 2020-04-21 | 重庆贝奥新视野医疗设备有限公司 | Stereoscopic imaging fundus camera system |
| CN112472022A (en) * | 2020-12-10 | 2021-03-12 | 上海雄博精密仪器股份有限公司 | Optical structure of hand-held fundus camera |
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| CN1148150C (en) * | 1999-07-30 | 2004-05-05 | 中国科学院光电技术研究所 | Adaptive optical retina imaging system (1) |
| CN101292860A (en) * | 2007-04-25 | 2008-10-29 | 江阴龙跃信息科技有限公司 | Retina cell microscopic imaging system with optical system for eliminating false light |
| CN101614032A (en) * | 2008-06-27 | 2009-12-30 | 上海管威消防系统有限公司 | The plug-in stifle of post fire hydrant |
| CN101797149A (en) * | 2009-12-31 | 2010-08-11 | 中国科学院长春光学精密机械与物理研究所 | Liquid crystal adaptive aberration correction retinal imaging device with high-efficiency utilization of energy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201840464U (en) * | 2010-08-22 | 2011-05-25 | 中山联合光电科技有限公司 | Retina imaging optical system with high resolution rate, large picture angle, automatic focusing function and coaxial illumination |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148150C (en) * | 1999-07-30 | 2004-05-05 | 中国科学院光电技术研究所 | Adaptive optical retina imaging system (1) |
| CN101292860A (en) * | 2007-04-25 | 2008-10-29 | 江阴龙跃信息科技有限公司 | Retina cell microscopic imaging system with optical system for eliminating false light |
| CN101614032A (en) * | 2008-06-27 | 2009-12-30 | 上海管威消防系统有限公司 | The plug-in stifle of post fire hydrant |
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Address after: 528400 Zhongshan Torch Development Zone, Guangdong Road, No. 10 Patentee after: Zhong Shan joint opto-electronic Science and Technology Co., Ltd. Address before: 528400 Zhongshan Torch Development Zone, Guangdong Patentee before: Union Optech (Zhongshan) Co., Ltd. |