CN209966345U

CN209966345U - Fundus camera with annular light source

Info

Publication number: CN209966345U
Application number: CN201920511739.7U
Authority: CN
Inventors: 沈兆乘; 马守宝; 平洁; 高许生
Original assignee: Suzhou Sihai Sihai Technology Co Ltd
Current assignee: Suzhou Sihai Sihai Technology Co Ltd
Priority date: 2019-04-16
Filing date: 2019-04-16
Publication date: 2020-01-21
Anticipated expiration: 2029-04-16

Abstract

The utility model discloses an eye ground camera with annular light source, it has improved the homogeneity that shines of light source when having improved the utilization efficiency of light source. The fundus camera with the annular light source comprises an illuminating system used for illuminating the fundus, the illuminating system comprises the annular light source, the annular light source comprises an LED light source and a transparent annular light guide pipe, and the LED light source is arranged in the annular light guide pipe.

Description

Fundus camera with annular light source

Technical Field

The utility model belongs to ophthalmology equipment field, in particular to eye ground camera with annular light source.

Background

The fundus refers to the posterior part of the lens in the eyeball, including the vitreous, retina, choroid, and optic nerve. The doctor can find the diseases of coronary heart disease, hypertension, diabetes and the like in time by observing capillary vessels on retina of human eyes. Patients with diabetes often suffer from diabetic retinopathy, symptoms can be found by observing the eyeground of the patients, doctors can conveniently make diagnosis, and the method has great significance for timely treatment of the patients.

Because the reflectivity of the cornea center of a human eye is high, in order to avoid that reflected light caused by the fact that light beams directly irradiate the cornea center influences imaging quality, in a conventional fundus camera, an illumination system often uses an annular diaphragm to enable a light source to emit out in the form of annular light beams, but because the annular diaphragm can block most of light rays in the center of the light source, the energy utilization rate of the light source is not high, and the imaging quality can be influenced; in some fundus cameras, a plurality of LED lamp beads are arranged in an annular mode in an illumination system to obtain an annular light source, but the quantity and the arrangement intervals of the LED lamp beads influence the illumination uniformity to influence the imaging quality.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to provide an eye fundus camera having an annular light source, which improves the illumination uniformity of the light source while improving the utilization efficiency of the light source.

In order to solve the technical problem, the utility model discloses a technical scheme does:

the fundus camera with the annular light source comprises an illuminating system used for illuminating the fundus, the illuminating system comprises the annular light source, the annular light source comprises an LED light source and a transparent annular light guide pipe, and the LED light source is arranged in the annular light guide pipe.

Preferably, the number of the LED light sources is two, and the two LED light sources are arranged back to back in the annular light guide tube.

Preferably, the inner wall of the annular light guide pipe is provided with a plurality of reflecting surfaces for reflecting light rays.

More preferably, a plurality of protrusions are formed on the inner wall of the annular light guide pipe, and the reflecting surface is located on the protrusions.

Preferably, the emitting direction of the LED light source is directed to the inside of the annular light guide pipe.

Preferably, the LED light source is a near-infrared light source.

More preferably, the LED light source has a center wavelength of 900 nm.

Preferably, the optical axis of the illumination system and the center line of the annular light guide are parallel to each other.

Preferably, the fundus camera further comprises an eyepiece group, a first reflector, a hollow reflector, an imaging lens group and an image acquisition device which are arranged in sequence.

More preferably, the illumination system further comprises a second reflecting mirror and a focusing lens group, and the annular light source, the second reflecting mirror and the focusing lens group are arranged in sequence.

The utility model adopts the above technical scheme, compare prior art and have following advantage:

the annular light source consisting of the annular light guide pipe and the LED light source arranged in the annular light guide pipe is adopted, so that the use of an annular diaphragm is avoided, the light source is enabled to emit out in an annular light beam, the shielding of the annular diaphragm to the center of the light source is avoided, and under the condition of ensuring that the light source uniformly illuminates the eyeground, the light energy utilization rate can be improved and the imaging quality can be improved; by adopting the infrared light illumination sensitive to the RPE pigment of the human eye, the pathological changes of the macular region and the abnormal blood vessels of the macular region of the human eye can be clearly shot, and the reference is provided for the diagnosis of the pathological changes of the doctor.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic view of an optical system of an eye fundus camera according to the present invention;

FIG. 2 is a schematic view of the annular light source of FIG. 1;

FIG. 3 is a cross-sectional view of a portion of the annular light pipe of FIG. 2.

Wherein, 1, human eyes; 2. a set of eye-catching lenses; 3. a first reflector; 4. a hollow reflector; 5. a focusing lens group; 6. a second reflector; 7. an annular light source; 71. an LED light source; 72. an annular light pipe; 721. a protrusion; 722. a reflective surface; 8. an imaging lens group; 9. an image acquisition device.

Detailed Description

The following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, enables the advantages and features of the invention to be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Fig. 1 shows an optical system of an eye fundus camera with an annular light source according to the present invention. Referring to fig. 1, the fundus camera includes an illumination system for illuminating the fundus, and further includes an ocular lens group 2, a first reflecting mirror 3, a hollow reflecting mirror 4, an imaging lens group 8, and an image capturing device 9, which are arranged in this order. The illumination system mainly comprises an annular light source 7, a second reflector 6 and a focusing lens group 5 which are sequentially arranged along the light path of the illumination system, wherein the annular light source 7 emits annular light beams which are reflected by the second reflector 6 and focused by the focusing lens group 5. The annular light beam focused by the hollow reflector 4 is reflected by the first reflector 3, passes through the ocular lens group 2, illuminates the fundus of the human eye 1, and enables the light reflected from the retina of the fundus to pass through the imaging lens group 8 and then be collected by the image acquisition device 9 to obtain a fundus image, and the fundus image can be stored on the image acquisition device 9 with a memory or an external memory electrically connected with the image acquisition device 9. The broken line in fig. 1 indicates the optical axis of the optical system. The image acquiring device 9 is a device such as a camera or a video camera for acquiring an image or further storing and transmitting the acquired image.

Referring to fig. 2, the ring light source 7 includes an LED light source 71 and a transparent ring light guide 72, and the LED light source 71 is disposed in the ring light guide 72. Preferably, the number of the LED light sources 71 is two, the two LED light sources 71 are arranged back to back in the annular light pipe 72, and the back surfaces of the two LED light sources 71 are attached to each other or have a gap which is much smaller than the circumference of the annular light pipe 72. The emission direction of the LED light source 71 is directed to the inside of the ring light guide 72. A plurality of protrusions 721 are formed on the inner wall of the annular light guide 72, and the protrusions 721 have reflecting surfaces 722 for reflecting the light emitted from the LED light source 71. The light emitted from the LED light source 71 is reflected by the plurality of reflecting surfaces 722 on the inner wall of the annular light pipe 72 for a plurality of times, and finally achieves a uniform light distribution effect, thereby generating a uniform annular light beam.

The LED light source 71 is a near infrared light source with a center wavelength of 900 nm.

The optical axis of the illumination system and the center line of the annular light pipe 72 are parallel to each other, preferably coincident with each other. The annular light pipe 72 is generally circular, and the optical axis of the illumination system passes through the center of the circular ring formed by the annular light pipe 72.

In the fundus camera, an annular light source 7 emits light in an annular light beam mode, a focusing lens group 5 converges the annular light beam, the converged light beam is reflected by the edge of a hollow reflector 4 and is reflected again by a first reflector 3, and a reflected light beam is transmitted to human eyes to illuminate the fundus. Two LED light sources 71 are arranged at the interface of the annular light pipe 72, the emitting directions of the two LED light sources 71 are opposite and all point to the inside of the light pipe, and light rays are emitted into the light pipe by the LEDs, are homogenized by the annular light pipe 72 and then are emitted in an annular light beam mode.

Different from the illumination light source of the conventional fundus camera, the utility model adopts near infrared light as the illumination light source, so as to observe human eyes in real time under the condition of meeting the illumination intensity, thereby avoiding the condition that the stimulation of the illumination light source to the pupils causes the contraction of the pupils to influence the photographing; different from the annular light source of the conventional fundus camera, the fundus camera of the utility model uses the annular light pipe to replace the annular diaphragm, so that the light source emits annular light in an annular light beam mode, and the annular diaphragm is prevented from shielding the center of the light source; different with the annular light source of conventional eye ground camera, the utility model discloses an eye ground camera utilizes annular light pipe to replace the LED of a plurality of annular arrangements, has avoided LED quantity and range interval to the influence of illumination homogeneity, adopts the utility model discloses an annular light source design can improve the utilization efficiency of light source and also improve the illumination homogeneity of light source.

The above embodiments are merely illustrative of the technical concepts and features of the present invention, and are a preferred embodiment, which is intended to enable persons skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention cannot be limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A fundus camera having an annular light source, comprising an illumination system for illuminating a fundus, characterized in that: the illumination system comprises an annular light source, the annular light source comprises an LED light source and a transparent annular light guide pipe, and the LED light source is arranged in the annular light guide pipe.

2. The fundus camera according to claim 1, wherein: the number of the LED light sources is two, and the two LED light sources are arranged in the annular light guide tube back to back.

3. The fundus camera according to claim 1, wherein: the inner wall of the annular light guide pipe is provided with a plurality of reflecting surfaces for reflecting light.

4. A fundus camera according to claim 3 wherein: a plurality of bulges are formed on the inner wall of the annular light guide pipe, and the reflecting surface is positioned on the bulges.

5. The fundus camera according to claim 1, wherein: the emitting direction of the LED light source points to the inside of the annular light guide pipe.

6. The fundus camera according to claim 1, wherein: the LED light source is a near-infrared light source.

7. The fundus camera according to claim 6, wherein: the central wavelength of the LED light source is 900 nm.

8. The fundus camera according to claim 1, wherein: the optical axis of the illumination system coincides with the center line of the annular light pipe.

9. The fundus camera according to claim 1, wherein: the fundus camera further comprises an ocular lens group, a first reflector, a hollow reflector, an imaging lens group and an image acquisition device which are sequentially arranged.

10. A fundus camera according to claim 9 wherein: the illumination system further comprises a second reflector and a focusing lens group, and the annular light source, the second reflector and the focusing lens group are sequentially arranged.