CN212415705U

CN212415705U - Fundus camera lighting system and fundus camera

Info

Publication number: CN212415705U
Application number: CN202020206997.7U
Authority: CN
Inventors: 姜欣; 常献刚; 和超; 张大磊
Original assignee: Shanghai Eaglevision Medical Technology Co Ltd
Current assignee: Shanghai Eaglevision Medical Technology Co Ltd
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2021-01-29
Anticipated expiration: 2030-02-25

Abstract

The utility model provides a fundus camera lighting system and fundus camera, wherein the fundus lighting system comprises at least one light source, which is arranged inside a lens cone and is positioned at one side of the central axis inside the lens cone; and the light reflecting structure is arranged in the lens cone, is opposite to the light source and is used for reflecting the light emitted by the light source out, and after passing through an ocular lens group or an ocular lens arranged in the lens cone, the light source images outside the lens cone. The utility model discloses an eye ground camera lighting system compares with the internal lighting mode among the prior art, need not to set up the part alone in the lens cone outside, and the eye ground camera volume is littleer, assembles simplyr.

Description

Fundus camera lighting system and fundus camera

Technical Field

The utility model relates to an eye ground camera technical field, concretely relates to eye ground camera lighting system and eye ground camera.

Background

The eyes are used as visual organs of the human perception world, external scenes form an inverted real image on the retina through an ocular optical system, and optical signals are converted into optic nerve signals to be transmitted to a brain system. The retina is the only tissue of the whole body which can observe blood vessels and the distribution state thereof under the condition of living body and non-invasiveness, and becomes an important window for diagnosing eye diseases and related systemic diseases of the whole body at present. Not only can diagnose the most common ophthalmic diseases, but also can diagnose diseases such as hypertension, diabetes, thrombus and the like at early stage (systemic diseases, particularly blood related diseases, all react on the fundus tissue).

The fundus optical imaging detection instrument is mainly a fundus camera, and at present, the mainstream structure of the fundus camera basically comprises an imaging system, an illuminating system, a positioning light path and a focusing light path. The imaging system and the illuminating system are required to reasonably arrange the spatial positions of the illuminating light path and the imaging light path to eliminate parasitic light and ghost images formed by the cornea and the omentum objective lens on the premise of selecting a proper imaging light source. The principle of the current fundus camera mainly comprises two principles (Lican, Sunwang, design and development of a novel fundus camera [ doctor academic thesis of university of Chinese academy of sciences ]2014.4), one is an external illumination type, and the other is an internal illumination type; the two illumination modes have basically the same structure in form, maintain the main structure of the traditional fundus camera, and basically consist of an illumination optical system and an imaging optical system. The two structures are mainly different in that the external illumination type fundus camera and the semi-reflecting semi-transparent plane mirror are used as light splitting elements of an illumination light path and an imaging light path, the two groups of systems do not have a shared mirror group, the internal illumination type fundus camera uses a hollow reflector as the light splitting element of the two light paths, and the two groups of optical systems share a mesh objective. Compared with the internal illumination mode, the fundus illumination mode has uniform energy and high energy utilization rate, the ghost image generated by the retina objective lens is avoided by the black spot plate, and the retina objective lens has the advantages of low production cost, reasonable structure and clear imaging.

However, the fundus camera of the internal illumination type requires a separate component such as a condenser, an annular diaphragm, a condenser, and a black spot plate outside the lens barrel, and therefore the fundus camera is bulky and complicated to assemble.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the eye ground camera of current internal illumination mode, need set up parts such as lens-collecting lens alone in the lens-barrel outside, lead to the eye ground camera bulky, assemble complicated technical defect to provide one kind and need not to set up parts alone in the lens-barrel outside, therefore the eye ground camera lighting system that the eye ground camera is small, the assembly is simple.

The utility model also provides an eye ground camera with above-mentioned eye ground camera lighting system.

Therefore, the utility model provides an eye fundus camera lighting system, include:

the at least one light source is arranged in the lens barrel and positioned on one side of the central axis in the lens barrel;

and the light reflecting structure is arranged in the lens cone, is opposite to the light source and is used for reflecting the light emitted by the light source out, and after passing through an ocular lens group or an ocular lens arranged in the lens cone, the light source images outside the lens cone.

Preferably, the light sources are a plurality of point light sources arranged in a circular configuration.

As a preferred scheme, the inside fixed annular lamp plate that is provided with of lens cone, the fixed light source that is provided with on a side of annular lamp plate.

As a preferable aspect, the light reflecting structure includes:

a first reflecting surface arranged in a ring shape, receiving and reflecting light from the light source;

the second reflecting surface is positioned inside the first reflecting surface, is arranged in a ring shape, receives the reflected light from the first reflecting surface and further reflects the reflected light outwards;

a connection surface connecting the first reflection surface and the second reflection surface;

and a middle through hole formed at a middle of the second reflection surfaces arranged in a ring shape.

Preferably, the first reflecting surface and/or the second reflecting surface is a total reflecting surface.

Preferably, the first reflecting surface is in the shape of a spherical reflecting surface, an aspherical reflecting surface, a free-form surface, or the like.

Preferably, the second reflecting surface is a plane reflecting surface.

Preferably, the light source comprises an infrared light source and/or a visible light source.

Preferably, the light source further comprises a collimating lens disposed between the light source and the light reflecting structure.

The utility model also provides an eye ground camera, include: the eye fundus camera comprises a lens barrel, an ocular lens group or an ocular objective lens, an illumination system and an objective lens group, wherein the ocular lens group or the ocular objective lens, the illumination system and the objective lens group are sequentially arranged in the lens barrel, and the illumination system is the eye fundus camera illumination system.

The technical scheme provided by the utility model, following advantage has:

1. the utility model discloses an eye ground camera lighting system, including light source and reflective structure, just light source and reflective structure all set up inside the lens cone, and reflective structure reflects away the light that the light source sent, through set up at the inside eyepiece group of lens cone or connect the mesh objective after, make the light source image in the outside of lens cone. When used for fundus photography, the light source is imaged at the corneal limbus, which is outside the lens barrel, and light enters the eye from the corneal limbus, illuminating the fundus. The utility model discloses an eye ground camera lighting system compares with the internal lighting mode among the prior art, need not to set up the part alone in the lens cone outside, and the eye ground camera volume is littleer, assembles simplyr.

2. The utility model discloses an eye ground camera lighting system, light source are a plurality of point light sources, arrange into circular structure, a plurality of point light sources through reflecting structure's reflection to behind the contact lens group or the contact object mirror, at the image that forms a plurality of point light sources at the eye cornea edge of observed person, light gets into eyes from the cornea edge, illuminates the eye ground, and it is better to illuminate the effect.

3. The utility model discloses an eye ground camera lighting system, the light source passes through annular lamp plate setting inside the lens cone, and the dismouting is easy, the maintenance of being convenient for. Annular lamp plate middle part cavity not only supplies reflection light outgoing of reflection of light structure, still can not influence the formation of image light path.

4. The utility model discloses an eyeground camera lighting system, the reflecting structure comprises a first reflecting surface arranged annularly, a second reflecting surface arranged annularly and a connecting surface for connecting the first reflecting surface and the second reflecting surface; the second reflecting surfaces which are arranged in an annular shape surround to form a middle through hole for the imaging light to pass through; the first reflecting surface receives and reflects light rays from the light source, and the second reflecting surface receives and further reflects the reflected light rays from the first reflecting surface outwards; the light further reflected outward is imaged on the cornea of the observer after passing through the ocular lens group or the ocular objective lens to illuminate the fundus.

5. The utility model discloses a fundus camera lighting system, first plane of reflection and/or second plane of reflection are the total reflection face, can improve the utilization ratio of light and prevent that stray light from getting into the formation of image light path, can omit the reflection rete in the illumination light path, reduce cost. The first reflecting surface is a spherical reflecting surface, an aspheric reflecting surface or a free-form surface, and the like, and the main purpose is to completely reflect light rays from the light source to the second reflecting surface, and the second reflecting surface is a plane reflecting surface, so that the light rays from the first reflecting surface can be emitted in a certain angle range as much as possible, the utilization rate of the light is improved, the light source is assisted to realize imaging, and stray light is prevented from entering an imaging light path.

6. The fundus camera lighting system of the utility model, the light source comprises an infrared light source and/or a visible light source; the infrared light source is used for aligning and focusing the eyeground, and the visible light source is used for shooting an eyeground image, so that the mydriasis step is omitted.

7. The utility model discloses an eye ground camera lighting system still includes collimating lens, sets up between light source and reflecting structure for carry out the collimation to light, and increase the light quantity of the first plane of reflection of directive.

8. The utility model also provides an eyeground camera, which comprises a lens cone, an ocular lens group or an ocular objective lens arranged inside the lens cone, an objective lens group and an illumination system, wherein the illumination system is the eyeground camera illumination system; since the fundus camera illumination system is adopted, all advantages brought by the adoption of the illumination system are naturally achieved.

Drawings

In order to more clearly illustrate the technical solutions in the prior art or the embodiments of the present invention, the drawings used in the description of the prior art or the embodiments are briefly introduced below.

Fig. 1 is a schematic structural diagram of the fundus camera illumination system of the present invention.

Fig. 2 is a schematic diagram of a light path of a light reflecting structure for reflecting light.

Fig. 3 is a perspective view of a light reflecting structure.

Fig. 4 is another perspective view of the light reflecting structure.

Fig. 5 is a side view of a light reflecting structure.

Fig. 6 is a front view of the annular lamp panel.

Reference numerals: 10. a lens barrel; 1. a light source; 11. an infrared light source; 12. a visible light source; 2. a light reflecting structure; 21. a first reflective surface; 22. a second reflective surface; 23. a connecting surface; 24. a middle through hole; 25. an incident surface; 3. an annular lamp panel; 4. a collimating lens; 5. a set of eye-catching lenses; 6. an objective lens group.

Detailed Description

The following describes the technical solution of the present invention in detail.

Example 1

The present embodiment provides a fundus camera lighting system, as shown in fig. 1, including: the device comprises at least one light source 1, a light source module and a light source module, wherein the light source 1 is arranged in a lens barrel 10 and is positioned on one side of a central axis in the lens barrel 10; and the reflecting structure 2 is arranged in the lens barrel 10, is opposite to the light source 1, and is used for reflecting the light emitted by the light source 1 out, and enables the light source 1 to form an image outside the lens barrel 10 after passing through an ocular lens group 5 arranged in the lens barrel 10 or an ocular lens.

The fundus camera lighting system of the embodiment comprises a light source 1 and a reflecting structure 2, wherein the light source 1 and the reflecting structure 2 are both arranged inside a lens barrel 10, the reflecting structure 2 reflects light rays emitted by the light source 1 out, and the light source 1 forms images outside the lens barrel 10 after passing through an ocular lens group 5 arranged inside the lens barrel 10 or an ocular lens. When used for fundus photography, the light source 1 is imaged on the corneal limbus located outside the lens barrel 10, and light enters the eye from the corneal limbus to illuminate the fundus. Compared with the internal illumination mode in the prior art, the fundus camera illumination system of the embodiment does not need to separately arrange components outside the lens barrel 10, and is smaller in size and simpler to assemble.

As shown in fig. 6, the light source 1 is a plurality of point light sources arranged in a circular structure. The plurality of point light sources are reflected by the reflecting structure 2 and form images of a plurality of point light sources at the edge of the cornea of the eye of an observed person after passing through the ocular lens group 5 or the ocular lens, and light enters the eye from the edge of the cornea to illuminate the fundus of the eye, so that the illuminating effect is better.

The lens cone 10 is internally and fixedly provided with an annular lamp panel 3, and a side face of the annular lamp panel 3 is fixedly provided with the light source 1. The light source 1 is arranged inside the lens cone 10 through the annular lamp panel 3, so that the lens cone is easy to assemble and disassemble and convenient to maintain. Annular lamp plate 3 middle part cavity not only supplies reflection light outgoing of reflection of light structure 2, still can not influence the formation of image light path.

The light source 1 comprises an infrared light source 11 and/or a visible light source 12. The infrared light source 11 is used for aligning and focusing the eyeground, and the visible light source 12 is used for shooting an eyeground image, so that a mydriasis step is omitted.

As shown in fig. 2 to 4, the light reflecting structure 2 includes: a first reflecting surface 21 arranged in a ring shape, receiving and reflecting light from the light source 1; a second reflecting surface 22 located inside the first reflecting surface 21 and arranged in a ring shape, receiving the reflected light from the first reflecting surface 21 and further reflecting the reflected light outwards; a connection surface 23 connecting the first reflection surface 21 and the second reflection surface 22; and a central through hole 24 formed at the center of the second reflecting surface 22 arranged in a ring shape.

The second reflecting surfaces 22 arranged in a ring shape enclose to form a middle through hole 24 for the imaging light to pass through; the first reflecting surface 21 receives the light from the light source 1 and reflects the light, and the second reflecting surface 22 receives the reflected light from the first reflecting surface 21 and further reflects the light outwards; the light further reflected outward is imaged on the cornea of the observer after passing through the ocular lens group 5 or the ocular objective lens to illuminate the fundus.

In this embodiment, the first reflective surface 21 and/or the second reflective surface 22 are total reflective surfaces. The reflecting structure 2 is made of optical plastic or optical glass, and the spherical total reflection surface and the conical total reflection surface meet the total reflection condition. Taking the example that the material of the reflective structure 2 is PMMA (refractive index 1.49), to achieve the total reflection condition, an included angle θ between any point tangent of the spherical total reflection surface and the incident surface of the reflective bowl is required to be more than or equal to 40 ° (as shown in fig. 5).

The first reflecting surface 21 is a spherical reflecting surface; as a modified design, the first reflecting surface 21 may have an aspherical reflecting surface or a free-form surface. Therefore, the utilization rate of light can be improved, stray light is prevented from entering an imaging light path, a reflecting film layer in an illumination light path can be omitted, and the cost is reduced. The second reflecting surface 22 is a plane reflecting surface. The light from the first reflecting surface 21 can be emitted in a certain angle range as much as possible, the utilization rate of the light is improved, the light source is assisted to realize imaging, and stray light is prevented from entering an imaging light path.

As shown in fig. 2, a collimating lens 4 is further included and is disposed between the light source 1 and the light reflecting structure 2. For collimating the light and increasing the amount of light directed to the first reflective surface 21.

The working principle of the fundus camera lighting system in the embodiment is as follows: the light source 1 is started, emitted light rays enter the light reflecting structure 2 through the incident surface 25 after being collimated by the collimating lens 4, the light rays are firstly reflected to the second reflecting surface 22 by the first reflecting surface 21, then reflected to pass through a middle through hole of the annular lamp panel 3, and are imaged outside the lens barrel 10 under the convergence action of the eyepiece group 5; if the human eye is outside the lens barrel 10, the distance can be adjusted so that the light source 1 is imaged on the corneal limbus of the human eye to illuminate the fundus.

Example 2

The present embodiment provides a fundus camera including: a lens barrel 10, and an ocular lens group 5 or an ocular objective lens, an illumination system, and an objective lens group 6, which are sequentially disposed inside the lens barrel 10, the illumination system being the fundus camera illumination system described in embodiment 1.

The fundus camera of the present embodiment naturally has all the advantages brought by the use of the above-described illumination system because the above-described fundus camera illumination system is used.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. An ophthalmic camera illumination system, characterized in that: the method comprises the following steps:

the light source (1) is at least one, is arranged in the lens barrel (10) and is positioned on one side of the central axis in the lens barrel (10);

the light reflecting structure (2) is arranged in the lens cone (10), is opposite to the light source (1), and is used for reflecting light rays emitted by the light source (1) out, and enables the light source (1) to form images outside the lens cone (10) after passing through an eyepiece group (5) or an objective lens arranged in the lens cone (10).

2. A fundus camera illumination system according to claim 1, wherein: the light sources (1) are a plurality of point light sources arranged in a circular configuration.

3. A fundus camera illumination system according to claim 2, wherein: the lens cone (10) is internally and fixedly provided with an annular lamp panel (3), and a side face of the annular lamp panel (3) is fixedly provided with the light source (1).

4. A fundus camera illumination system according to any one of claims 1-3, wherein: the light reflecting structure (2) comprises:

a first reflecting surface (21) arranged in a ring shape, receiving and reflecting light from the light source;

a second reflecting surface (22) located inside the first reflecting surface (21) and arranged in a ring shape, receiving the reflected light from the first reflecting surface (21) and further reflecting outwards;

a connection surface (23) connecting the first reflection surface (21) and the second reflection surface (22);

a central through hole (24) formed in the middle of the second reflection surface (22) arranged in a ring shape.

5. A fundus camera illumination system according to claim 4, wherein: the first reflecting surface (21) and/or the second reflecting surface (22) are/is a total reflecting surface.

6. A fundus camera illumination system according to claim 4, wherein: the first reflecting surface (21) is in the shape of a spherical reflecting surface, an aspheric reflecting surface, a free-form surface or the like.

7. A fundus camera illumination system according to claim 4, wherein: the second reflecting surface (22) is a plane reflecting surface.

8. A fundus camera illumination system according to any one of claims 1-3, wherein: the light source (1) comprises an infrared light source (11) and/or a visible light source (12).

9. A fundus camera illumination system according to claim 1, wherein: the LED illumination device also comprises a collimating lens (4) which is arranged between the light source (1) and the reflecting structure (2).

10. A fundus camera, comprising: lens cone (10), and set gradually connect eyepiece group (5) or connect the eye objective inside lens cone (10), lighting system to and objective group (6), its characterized in that: the illumination system is a fundus camera illumination system of any of claims 1-9.