CN104757934A - Fundus camera lighting system - Google Patents
Fundus camera lighting system Download PDFInfo
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- CN104757934A CN104757934A CN201510216416.1A CN201510216416A CN104757934A CN 104757934 A CN104757934 A CN 104757934A CN 201510216416 A CN201510216416 A CN 201510216416A CN 104757934 A CN104757934 A CN 104757934A
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- light
- light source
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Abstract
The invention discloses a fundus camera lighting system. The fundus camera lighting system comprises an annular light source, a light equalizing mirror, a half-reflecting and half-transmitting mirror and a reflecting mirror. Light emitted by the annular light source passes through the reflecting mirror to change the light path, passes through the light equalizing mirror and then passes through the half-reflecting and half-transmitting mirror to arrive at an eye object lens, so that annular light spots are formed. Compared with a traditional lighting system, the fundus camera lighting system is simpler in structure and provides more uniform and more sufficient lighting for the fundi, and the light energy utilization rate of the lighting system is greatly increased.
Description
Technical field
The present invention relates to a kind of for the luminaire in fundus camera, particularly relate to a kind of fundus camera illuminator, belong to medical science fundus imaging field.
Background technology
Blood vessel on human eye retina is the blood vessel that whole body uniquely can directly be observed, for how just can start a long time ago the research of human eye retina's imaging.Because human eye itself is not luminous; need to throw light on to it with external light source; but human eye pupil size by day generally can not more than 3mm, and pupil size is too little, and the light energy that illuminator can enter optical fundus is smaller; in addition corneal reflex rate is higher than fundus reflex rate; human eye is observed, is just equivalent to observe outdoor scenes indoor at night, can only see that indoor scene is the same; can not directly obtain amphiblestroid picture, thus for fundus camera progress slowly.Until the Oph appearance of indirect type that earlier 1900s can freely reflect, what make fundus camera creates possibility.This type of ophthalmoscope requires that illuminator and imaging system are through the different piece of eyes, and to avoid the backlight of cornea to reflect, this design principle, the design for fundus camera provides important method.
Modern fundus camera is Oph succession to the indirect type that can freely reflect of earlier 1900s design and improvement.Nineteen twenty-five, the First fundus camera in the world by German Zeiss company designs.This fundus camera mainly comprises imaging system and illuminator, and adopt the Zeiss fundus camera configuration form of standard, illuminator and imaging system are two independently systems, are connected by half-reflecting half mirror.The light sent by the light source of illuminator enters in human eye after illumination path, after fundus reflex, enter imaging system, and finally imaging in reception image planes.This camera before to eyes imaging, needs to carry out mydriasis process to human eye, has certain side effect to human body.And connecing order object lens because illuminator and imaging system do not share, the capacity usage ratio of system is lower.
Within 1969, invent a kind of new fundus camera structure by Knoll.The imaging system of this structure and illuminator share one group and connect order object lens.Compared to the normal structure form that Zeiss proposes, this structure connects order object lens because imaging system and illuminator share one group, and system design gets up more complicated, and aberration is more difficult correction also.But the version illumination efficiency that Knoll provides is higher, the eyeglass number adopted is less, although through the development of four more than ten years, the version change of system is little.The fundus camera that present stage exists, still many employings this kind of version.
The optical system of fundus camera mainly comprises imaging system and illuminator, lighting object due to illuminator is human eye retina, if the light beam inciding optical fundus is uneven, not only observed person can not feel well, also can have a great impact final image quality, therefore the most important condition that Uniform Illumination is fundus camera illuminator be carried out to optical fundus.
At present critical illumination and Kohler illumination two kinds of modes are mainly contained for bright field illumination.Light source direct imaging on illuminated object, is ensured the conjugacy of light source and illuminated object by critical illumination.Critical illumination is uneven or when presenting obvious filamentray structure at light-source brightness, will be reflected on illuminated object, make illuminated surface uneven.In order to reach Uniform Illumination, require that the uniformity of lighting source itself is higher.Kohler illumination source imaging on the entrance pupil face of follow-up object lens.Because not direct imaging is on observed object, illuminated surface there is comparatively level and smooth illumination, avoid the inhomogeneities that critical illumination exists.The most important advantage of Kohler illumination to realize Uniform Illumination, but in use it is found that the spherical aberration of Kohler illumination is larger.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of fundus camera illuminator.
In order to achieve the above object, this invention takes following technical scheme: compared to prior art, fundus camera illuminator provided by the invention comprises annular light source, even light microscopic, half-reflecting half mirror and reflecting mirror, the light that described annular light source is launched changes light path through reflecting mirror, arrive at through half-reflecting half mirror again after even light microscopic and connect order object lens, thus circularize hot spot.
The present invention also provides another kind of fundus camera illuminator, comprise annular light source, reflecting mirror, even light microscopic, half-reflecting half mirror and connect order object lens, the light that annular light source is launched changes light path through reflecting mirror, arrive at through half-reflecting half mirror again after even light microscopic and connect order object lens, thus circularize hot spot, described annular light source employing is alternately arranged by near-infrared and white light flash of light LED and circularizes light source, by the even light microscopic of illuminator with connect order object lens by light source direct imaging at eye pupil place, to obtain the suitable ring-shaped light spot of size, even light microscopic sheet number is 3, white light flash of light LED is as the flash lamp of system, for taking pictures to eye fundus image, near-infrared LED is used for carrying out Real Time Observation to eye fundus image, and white light flash of light LED and near-infrared LED are evenly arranged into an annulus, is conducive to illuminator and carries out evenly illumination fully to optical fundus.
Preferably, above-mentioned annular light source can also utilize optical fiber arrangement to obtain.
Fundus camera illuminator provided by the invention, for traditional illuminator, structure is more simple, and more evenly abundant to the illumination on optical fundus, the efficiency of light energy utilization of illuminator improves greatly.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional illumination system;
Fig. 2 is the structural representation of illuminator of the present invention;
Fig. 3 a is the illumination ring-shaped light spot simulated effect schematic diagram of the present invention at cornea place;
Fig. 3 b is fundus illumination simulated effect schematic diagram of the present invention;
Fig. 3 c is the energy distribution curve schematic diagram of fundus illumination of the present invention;
Fig. 4 is the aberration curve figure of illuminator of the present invention.
Detailed description of the invention
The invention provides a kind of fundus camera illuminator, for making object of the present invention, technical scheme and effect 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 in order to explain the present invention, be not intended to limit the present invention.
Embodiment
Fundus camera illuminator disclosed in the present embodiment, comprise annular light source, reflecting mirror, even light microscopic, half-reflecting half mirror and connect order object lens, the light that annular light source is launched changes light path through reflecting mirror, arrive at through half-reflecting half mirror again after even light microscopic and connect order object lens, thus circularize hot spot, described annular light source employing is alternately arranged by near-infrared and white light flash of light LED and circularizes light source, by the even light microscopic of illuminator with connect order object lens by light source direct imaging at eye pupil place, to obtain the suitable ring-shaped light spot of size, even light microscopic sheet number is 3, white light flash of light LED is as the flash lamp of system, for taking pictures to eye fundus image, near-infrared LED is used for carrying out Real Time Observation to eye fundus image, and white light flash of light LED and near-infrared LED are evenly arranged into an annulus, is conducive to illuminator and carries out evenly illumination fully to optical fundus.
In order to eliminate the veiling glare that corneal reflex produces, the illuminating bundle finally inciding cornea must be ring-shaped light spot.Design ring-shaped light spot interior diameter 3mm, overall diameter 6mm, light source maximum gauge 12mm, according to imaging system computing formula, the amplification of illuminator is β:
For idealized system, connecing order object lens to the oculopupillary operating distance of people is 40mm, and anterior surface of cornea is to interpupillary distance 3.66mm, and therefore connecing order object lens to the operating distance of cornea is 36.34mm, i.e. the object distance of illuminator.Connecing order object lens because illuminator and imaging system share one group, only needing when therefore carrying out system design to design organizing even light microscopic after illuminator.
In order to obtain ring-shaped light spot, traditional design method adds annular diaphragm in the illumination system, and first the light that light source sends become an intermediary image at annular diaphragm place, finally becomes intermediary image at cornea place again.Utilize traditional method design, for the general imaging system based on mechanical focusing mode, design the illuminator obtained as shown in Figure 1.
As shown in Figure 1, system, because need to obtain an intermediary image, causes needing to adopt many arrangements of mirrors sheet, system structure more complicated.In order to simplied system structure, reduce system design difficulty, the present invention improves said structure.Light source no longer adopts traditional halogen tungsten lamp, but adopts and be alternately arranged circularized light source by near-infrared and the white light LED that glistens, by the even light microscopic of illuminator with connect order object lens by light source direct imaging at eye pupil place, to obtain the suitable ring-shaped light spot of size.LED light source is adopted not only can structurally light source design to be circularized, and higher by LED luminous efficiency, and when final acquisition equivalent illumination, light source power can effectively be reduced.
Fig. 2 gives the lighting system structure after improvement.As can be seen from the figure, no longer include intermediary image in illuminator, thus annular diaphragm is also no longer arranged, and system even light microscopic sheet number is reduced to 3 by original 6, effectively being simplified of system structure.For LED light source, white light LEDs as the flash lamp of system, for taking pictures to eye fundus image; Near-infrared LED is used for carrying out Real Time Observation to eye fundus image.White light flash of light LED and near-infrared LED are evenly arranged into an annulus, are conducive to illuminator and carry out evenly illumination fully to optical fundus.In addition, owing to not having annular diaphragm to carry out blocking light in system, the efficiency of light energy utilization of illuminator will improve greatly.
For the design of annular light source, except LED combination of being glistened by near-infrared and white light obtains, optical fiber arrangement can also be utilized to obtain.The uniformity of LightTools to illuminator is utilized to emulate and analyze.Arranging light source power is 100W, and the light source angle of divergence is 30 °, Geometrical Optics 10000000.Fig. 3 is the illuminating effect figure obtained.The ring-shaped light spot illuminating effect figure of Fig. 3 (a) for obtaining at cornea eye place, hot spot internal diameter 3mm, external diameter 6mm; The illuminating effect figure on the retina of Fig. 3 (b) for obtaining.Illuminator can to the region intraoral illumination of optical fundus diameter 20mm; The illumination energy scattergram that Fig. 3 (c) is optical fundus.
In the distribution curve of illumination figure shown in Fig. 3 (c), the field of illumination in corresponding 30 °, optical fundus (± 15 °) scope of ± 4.47mm, the power density P of central point
centerthe highest, be 0.01286W/mm
2, the power density P in 30 ° of field of illuminations on 85% position
85%, be 0.01166W/mm
2, peak power P
maxfor 0.01286W/mm
2.Definition illumination optical fundus uniformity U is:
The illuminator of the present invention's design reaches 90.7% to 30 °, the optical fundus scope intraoral illumination uniformity, meets illuminator requirement.
Illuminator is not strict for the requirement of image quality, because the picture element of illuminator does not affect the image quality of illuminated object, just affects the illumination of illuminated object.But illuminator suitably controls needing the spherical aberration to system sometimes.Because light source stock size is little, the angle of divergence is larger, and namely the visual field of light source is little, and relative aperture is larger, and at this moment the aberration of system is mainly spherical aberration.If the spherical aberration of system is larger, when the chief ray of a certain visual field of illuminator passes through the pupil centre of imaging system, the chief ray of other visual fields is not just by pupil centre, and this will likely cause imaging system to produce vignetting, finally cause the uneven illumination of image planes even.Illuminator is not strict for the alignment requirements of spherical aberration, does not need to correct completely, only spherical aberration need be controlled in certain scope.Fig. 4 gives the spherical aberration of the illuminator after improvement, the curvature of field and distortion curve.As can be seen from the figure, the spherical aberration of this system, within the scope of ± 0.5mm, can meet the picture element requirement of illuminator.
Fundus camera illuminator provided by the invention, for traditional illuminator, structure is more simple, and more evenly abundant to the illumination on optical fundus, the efficiency of light energy utilization of illuminator improves greatly.
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 (3)
1. a fundus camera illuminator, it is characterized in that: described fundus camera illuminator comprises annular light source, even light microscopic, half-reflecting half mirror and reflecting mirror, the light that described annular light source is launched changes light path through reflecting mirror, arrive at through half-reflecting half mirror again after even light microscopic and connect order object lens, thus circularize hot spot.
2. a fundus camera illuminator, comprise annular light source, reflecting mirror, even light microscopic, half-reflecting half mirror and connect order object lens, it is characterized in that: the light that described annular light source is launched changes light path through reflecting mirror, arrive at through half-reflecting half mirror again after even light microscopic and connect order object lens, thus circularize hot spot, described annular light source employing is alternately arranged by near-infrared and white light flash of light LED and circularizes light source, by the even light microscopic of illuminator with connect order object lens by light source direct imaging at eye pupil place, to obtain the suitable ring-shaped light spot of size, even light microscopic sheet number is 3, white light flash of light LED is as the flash lamp of system, for taking pictures to eye fundus image, near-infrared LED is used for carrying out Real Time Observation to eye fundus image, and white light flash of light LED and near-infrared LED are evenly arranged into an annulus, is conducive to illuminator and carries out evenly illumination fully to optical fundus.
3. fundus camera illuminator according to claim 2, is characterized in that: described annular light source can also utilize optical fiber arrangement to obtain.
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| CN201510216416.1A CN104757934A (en) | 2015-04-27 | 2015-04-27 | Fundus camera lighting system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108309228A (en) * | 2017-01-16 | 2018-07-24 | 天津工业大学 | portable fundus camera optical system |
| CN108433698A (en) * | 2018-04-16 | 2018-08-24 | 中山联合光电科技股份有限公司 | One kind disappears ghost fundus camera lighting system |
| CN109497943A (en) * | 2018-12-28 | 2019-03-22 | 苏州微清医疗器械有限公司 | A kind of lens module and the fundus camera with the lens module |
| CN109889689A (en) * | 2017-12-06 | 2019-06-14 | 洛克威尔柯林斯公司 | Synchronous camera and lighting system |
| CN109893101A (en) * | 2019-04-26 | 2019-06-18 | 中国科学院长春光学精密机械与物理研究所 | A kind of caries diagnosis imaging device and hand-held caries diagnosis imager |
| CN110141188A (en) * | 2019-05-15 | 2019-08-20 | 佛山科学技术学院 | A kind of big visual field fundus camera Uniform Illumination method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4458937B2 (en) * | 2004-06-02 | 2010-04-28 | 株式会社ニデック | Eye refractive power measuring device |
| CN103300816A (en) * | 2013-05-30 | 2013-09-18 | 中国科学院长春光学精密机械与物理研究所 | Annular lighting device for eye ground camera |
| CN104523222A (en) * | 2014-12-17 | 2015-04-22 | 严俊文 | Retina camera lighting system |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4458937B2 (en) * | 2004-06-02 | 2010-04-28 | 株式会社ニデック | Eye refractive power measuring device |
| CN103300816A (en) * | 2013-05-30 | 2013-09-18 | 中国科学院长春光学精密机械与物理研究所 | Annular lighting device for eye ground camera |
| CN104523222A (en) * | 2014-12-17 | 2015-04-22 | 严俊文 | Retina camera lighting system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108309228A (en) * | 2017-01-16 | 2018-07-24 | 天津工业大学 | portable fundus camera optical system |
| CN109889689A (en) * | 2017-12-06 | 2019-06-14 | 洛克威尔柯林斯公司 | Synchronous camera and lighting system |
| CN109889689B (en) * | 2017-12-06 | 2021-07-13 | 洛克威尔柯林斯公司 | Synchronous camera and lighting system |
| CN108433698A (en) * | 2018-04-16 | 2018-08-24 | 中山联合光电科技股份有限公司 | One kind disappears ghost fundus camera lighting system |
| CN109497943A (en) * | 2018-12-28 | 2019-03-22 | 苏州微清医疗器械有限公司 | A kind of lens module and the fundus camera with the lens module |
| CN109893101A (en) * | 2019-04-26 | 2019-06-18 | 中国科学院长春光学精密机械与物理研究所 | A kind of caries diagnosis imaging device and hand-held caries diagnosis imager |
| CN110141188A (en) * | 2019-05-15 | 2019-08-20 | 佛山科学技术学院 | A kind of big visual field fundus camera Uniform Illumination method and system |
| CN110141188B (en) * | 2019-05-15 | 2023-08-08 | 佛山科学技术学院 | Uniform illumination method and system for large-view-field fundus camera |
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Application publication date: 20150708 |