CN111166283A - Fundus shooting system - Google Patents
Fundus shooting system Download PDFInfo
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- CN111166283A CN111166283A CN201911351692.3A CN201911351692A CN111166283A CN 111166283 A CN111166283 A CN 111166283A CN 201911351692 A CN201911351692 A CN 201911351692A CN 111166283 A CN111166283 A CN 111166283A
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- lens group
- illumination
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- 238000005286 illumination Methods 0.000 claims abstract description 135
- 238000003384 imaging method Methods 0.000 claims abstract description 76
- 210000001747 pupil Anatomy 0.000 claims description 42
- 230000003287 optical effect Effects 0.000 claims description 35
- 210000004087 cornea Anatomy 0.000 abstract description 4
- 210000000695 crystalline len Anatomy 0.000 description 119
- 238000010586 diagram Methods 0.000 description 10
- 238000003745 diagnosis Methods 0.000 description 4
- 210000004220 fundus oculi Anatomy 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 208000029091 Refraction disease Diseases 0.000 description 1
- 230000004430 ametropia Effects 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 238000003759 clinical diagnosis Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 208000014733 refractive error Diseases 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0008—Apparatus for testing the eyes; Instruments for examining the eyes provided with illuminating means
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0016—Operational features thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0091—Fixation targets for viewing direction
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
- A61B3/15—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
- A61B3/156—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for blocking
Abstract
The invention discloses a fundus shooting system which comprises an imaging module, an objective lens module and an illuminating module. The objective lens module is arranged on the front side of the imaging module and comprises an ocular lens group and a hollow reflector which are arranged in front and back, and the hollow reflector faces the ocular lens group and is obliquely arranged; the illumination module is arranged on one side of the hollow reflector and arranged towards the reflecting surface of the hollow reflector, and comprises an annular light source, and an illumination lens group and an annular illumination diaphragm which are arranged between the annular light source and the hollow reflector. The annular illumination light generated by the fundus shooting system is annular illumination light with certain axial thickness when reaching the eye to be detected, so that the cornea, the front surface, the back surface and the like of eye tissues are annular illumination, the reflected light generated by other eye tissues except the fundus is reduced, the image signal noise is reduced, the signal to noise ratio of the reflected light generated by the eye to be detected is improved, and the imaging quality of the fundus image is improved.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a fundus shooting system.
Background
The fundus image is commonly used for diagnosing various diseases of ophthalmology and the whole body, generally, in the diagnosis process, the imaging quality of the fundus image can greatly influence the diagnosis accuracy, and the fundus image accords with the clinical diagnosis standard, and the optic disc, the blood vessel and the macular region of the fundus image are clear and have reasonable visible positions. Referring to fig. 1, the current fundus oculi photographing device can only form annular illumination light on a single eye tissue surface (such as a posterior lens surface), and form illumination light spots on other eye tissue surfaces (such as an anterior lens surface and a corneal surface), so that other eye tissue surfaces generate reflected light, and the reflected light generated by other eye tissue surfaces is collected by an image collector, so as to form stray light or image signal noise, which interferes with the imaging of the reflected light on the fundus oculi, reduces the imaging quality of fundus oculi images, and affects the diagnosis result.
Disclosure of Invention
The invention mainly aims to provide a fundus shooting system, and aims to solve the problems that fundus images shot by existing fundus shooting equipment are low in signal-to-noise ratio and poor in imaging quality due to the influence of stray light.
To achieve the above object, the present invention provides a fundus imaging system for imaging a fundus image of an eye to be examined, comprising:
the imaging module is used for receiving the reflected light of the fundus and imaging;
the objective lens module is arranged on the front side of the imaging module and comprises an ocular lens group and a hollow reflector which are arranged in front and at back, and the light reflecting surface of the hollow reflector faces the ocular lens group and is obliquely arranged; and the number of the first and second groups,
the illumination module is arranged on one side of the hollow reflector and faces the light reflecting surface of the hollow reflector, the illumination module comprises an annular light source, and an illumination lens group and an annular illumination diaphragm which are arranged between the annular light source and the hollow reflector, and the annular light source is used for generating annular illumination light;
the annular illuminating light is modulated by the annular illuminating diaphragm and the illuminating mirror group and then projected to the hollow reflector, then modulated by the ocular lens group to form annular illuminating light with certain axial thickness and then incident to the fundus, and fundus reflected light passes through the hollow area of the annular illuminating light, then modulated by the ocular lens group, passes through the hollow area of the hollow reflector and then is imaged by the imaging module.
Optionally, the center of the hollow reflector is located at an image plane position of the annular light source after being imaged by the illumination mirror group.
Optionally, the illumination mirror group comprises:
the first lens group is arranged between the annular light source and the annular lighting diaphragm and is used for converging the annular lighting light; and the number of the first and second groups,
and the second mirror group is arranged between the ring body illumination diaphragm and the hollow reflector and used for adjusting the projection of the annular illumination light to the hollow reflector.
Optionally, the ocular lens group comprises one or more lenses, and an antireflection film is coated on the surfaces of the lenses; and/or the presence of a gas in the gas,
the annular light source is a multispectral light source and is used for emitting annular illumination light with different wave bands.
Optionally, the imaging module comprises:
an image collector for receiving fundus reflection light; and the number of the first and second groups,
the imaging lens group is arranged between the hollow reflector and the image collector, and the center of the ocular lens group, the center of the hollow reflector and the center of the imaging lens group are arranged in a collinear way.
Optionally, the imaging lens group comprises
The focusing lens group and the condensing lens group are coaxially arranged.
Optionally, the imaging module further comprises:
the optical splitter is arranged between the imaging lens group and the image collector and is used for enabling one part of fundus reflection light to penetrate through the image collector and the other part of fundus reflection light to be reflected; and the number of the first and second groups,
the fixation mark is arranged on a reflection light path of fundus reflection light reflected by the optical splitter, and the distance from the fixation mark to the center of the optical splitter is the same as the distance from the image collector to the center of the optical splitter.
Optionally, the fixation mark comprises a plurality of light-emitting points arranged at intervals, and the plurality of light-emitting points are arranged in parallel so as to be capable of being controlled to be switched on and off independently; and/or the presence of a gas in the gas,
the acquisition range of the image collector comprises visible light and near infrared light; and/or the presence of a gas in the gas,
the image collector is a two-bit array CMOS or CCD.
Optionally, the fundus capture system further comprises an eye alignment module, the eye alignment module comprising:
a pupil illumination source, and,
the pupil cameras are arranged in the circumferential direction of the ocular lens group at intervals and used for acquiring pupil dislocation images shot at different angles, and the front ends of the pupil cameras are close to the ocular lens group and are obliquely arranged so that the centers of optical axes of the pupil cameras are aligned to the pupils.
Optionally, the pupil illumination light source is an infrared light source; and/or the presence of a gas in the gas,
the pupil illumination light source is an infrared LED lamp, and the central wavelength of the infrared LED lamp is 850nm or 940 nm.
In the technical scheme of the invention, the fundus shooting system comprises an imaging module, an objective lens module and an illumination module. The objective lens module is arranged on the front side of the imaging module and comprises an ocular lens group and a hollow reflector which are arranged in front and back, and the hollow reflector faces the ocular lens group and is obliquely arranged; the illumination module is arranged on one side of the hollow reflector and arranged towards the reflecting surface of the hollow reflector, and comprises an annular light source, and an illumination lens group and an annular illumination diaphragm which are arranged between the annular light source and the hollow reflector. When the fundus shooting system works, the annular light source emits an annular illumination light source, the annular illumination light is projected to the hollow reflector after being modulated by the annular illumination diaphragm and the illumination lens group, and then is modulated by the ocular lens group to form annular illumination light with certain axial thickness to be incident to the fundus, and fundus reflection light passes through the hollow area of the annular illumination light, is modulated by the ocular lens group, passes through the hollow area of the hollow reflector and then is imaged by the imaging module. The annular illumination light generated by the fundus shooting system is annular illumination light with certain axial thickness when reaching the eye to be detected, so that the cornea, the front surface, the back surface and the like of eye tissues are annular illumination, the reflected light generated by other eye tissues except the fundus is reduced, the image signal noise is reduced, the signal to noise ratio of the reflected light generated by the eye to be detected is improved, and the imaging quality of the fundus image is improved. In addition, the annular illumination light is annular when reaching the ocular lens group, so that the reflection of the ocular lens group to incident light is reduced, the interference of the incident light to fundus reflection light is reduced, stray light is reduced, and the imaging quality of fundus images is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic view of an illumination optical path system of a conventional fundus imaging apparatus;
FIG. 2 is a schematic view of the fundus oculi photographing system provided by the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a schematic diagram of a first embodiment of an illumination optical path system of the fundus imaging system shown in fig. 2;
fig. 5 is a schematic diagram of a second embodiment of an illumination optical path system of the fundus imaging system shown in fig. 2;
fig. 6 is a schematic diagram of an illumination optical path system of the fundus imaging system shown in fig. 2 according to a third embodiment;
fig. 7 is a schematic diagram of an illumination optical path system of the fundus imaging system shown in fig. 2 according to a fourth embodiment.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
71 | |
| 1 | Eyepiece set | 72 | Light splitter |
| 2 | |
73 | Eyesight-fixing mark |
| 3 | |
8 | |
| 31 | |
91 | Cornea |
| 32 | |
92 | Anterior surface of the |
| 4 | |
93 | Posterior surface of |
| 5 | |
||
| 6 | Imaging lens group |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The existing fundus shooting equipment has no good processing method for stray light and fundus image signal noise, reduces the imaging quality of fundus images, and influences diagnosis results. To this end, the present invention proposes a fundus imaging system 100 that reduces fundus imaging noise by generating annular illumination light having a certain axial thickness at the eye to be examined so that the surfaces of eye tissues other than the fundus are all illuminated annularly. Fig. 2 is a schematic diagram of an embodiment of a fundus imaging system 100 provided by the present invention, fig. 3 is a partial enlarged view of a portion a in fig. 2, and fig. 4 to 7 are schematic diagrams of an embodiment of an illumination optical path system of the fundus imaging system 100 shown in fig. 2.
Referring to fig. 2, the fundus photographing system 100 provided by the present invention includes an imaging module, an objective lens module, and an illumination module. The objective lens module is arranged on the front side of the imaging module, the objective lens module comprises an eyepiece set 1 and a hollow reflector 2 which are arranged in front and back, and the light reflecting surface of the hollow reflector 2 faces the eyepiece set 1 and is obliquely arranged; the lighting module is arranged on one side of the hollow reflector 2 and faces the reflecting surface of the hollow reflector 2, and comprises an annular light source 5, and a lighting lens group 3 and an annular lighting diaphragm 4 which are arranged between the annular light source 5 and the hollow reflector 2.
When the fundus shooting system 100 works, the annular light source 5 emits annular illuminating light, the annular illuminating light is modulated by the beam-shaped annular illuminating diaphragm 4 and the illuminating mirror group 3 and then is projected to the hollow reflector 2, the annular illuminating light is modulated by the ocular lens group 1 to form annular illuminating light with a certain axial thickness and then is incident to the fundus, and fundus reflected light passes through a hollow area of the annular illuminating light, is modulated by the ocular lens group 1, passes through a hollow area of the hollow reflector 2 and then is imaged by the imaging module. Referring to fig. 3, when reaching the eye to be detected, the annular illumination light generated by the fundus shooting system 100 of the present invention appears as annular illumination light with a certain axial thickness, so that the cornea 91, the anterior surface 92 of the crystalline lens, the posterior surface 93 of the crystalline lens, etc. of the eye tissue are all annular illumination, the reflected light generated by other eye tissues except the fundus is reduced, and the image signal noise is reduced, so that the signal-to-noise ratio of the reflected light generated by the eye to be detected is improved, and the imaging quality of the fundus image is improved. In addition, the annular illumination light is annular when reaching the ocular lens group 1, so that the reflection of the ocular lens group 1 to incident light is reduced, the interference of the incident light to fundus reflection light is reduced, stray light is reduced, and the imaging quality of fundus images is further improved.
Further, the imaging module includes an image collector 71 and an imaging lens group 6, the imaging lens group 6 is disposed between the hollow reflector 2 and the image collector 71, and the center of the ocular lens group 1, the center of the hollow reflector 2 and the center of the imaging lens group 6 are arranged in a collinear manner.
In the fundus photographing system 100, the optical path system is functionally divided into an illumination optical path system for conducting illumination light emitted from the light source to the eye to be inspected and an imaging optical path system for conducting reflected light of the eye to be inspected to the image acquirer 71. In the fundus shooting system 100 of the present invention, the illumination optical path system includes an annular light source 5, an illumination lens group 3, a ring illumination diaphragm 4, a hollow reflector 2 and an ocular lens group 1. The imaging optical path system comprises an eyepiece group 1, a hollow reflector 2, an imaging lens group 6 and an image collector 71.
As shown in fig. 2, the eyepiece group 1, the hollow reflector 2, and the imaging module are horizontally arranged from front to back; the lighting lens group 3, the ring lighting diaphragm 4 and the annular light source 5 are vertically arranged from top to bottom; the hollow reflector 2 is obliquely arranged, and the reflecting surface of the hollow reflector 2 is respectively opposite to the ocular lens group 1 and the illuminating lens group 3. Annular illumination light emitted by the annular light source 5 vertically upwards is modulated by the annular illumination diaphragm 4 and the illumination lens group 3 and then is projected to the hollow reflector 2, the hollow reflector 2 reflects the vertically upwards annular illumination light to the horizontal direction, so that the annular illumination light is transmitted forwards to the ocular lens group 1 along the horizontal direction, and then the annular illumination light with certain axial thickness is formed after being modulated by the ocular lens group 1 and then is incident to the fundus.
The fundus imaging system 100 of the present invention separates an illumination optical path and an imaging optical path by the hollow mirror 2. The hollow reflector 2 is used as a demarcation point, the front section of the illumination light path is vertically arranged, the ring illumination diaphragm 44 is arranged at the front section of the illumination light path, the ring illumination beam can be shaped, meanwhile, the eyeground reflected light cannot be influenced to enter the imaging module for imaging, and the design is the ingenious point.
It should be noted that, the number of the lens groups included in the illumination lens group 3, and the positions of the illumination lens group 3 and the illumination diaphragm 44 of the ring body are not limited in the present invention, and all the illumination optical systems capable of forming annular illumination light with a certain axial thickness at the eye to be detected are protected by the present invention.
Fig. 4 is a schematic diagram of the first embodiment of the illumination optical path system of the fundus imaging system 100 shown in fig. 2, in which the hollow mirror 2 is not shown, and since the hollow mirror 2 does not affect the imaging of the illumination optical path, the hollow mirror 2 may be located at any position between the ocular lens group 1 and the illumination lens group 3. Preferably, the center of the hollow reflector 2 is located at the position of an image plane of the annular light source 5 after being imaged by the illumination mirror group 3. At the moment, the annular illumination light is converged on the hollow reflector 2, the area of the required hollow reflector 2 is the minimum, the space of the lens cone is saved, the annular illumination light can be totally reflected to the ocular lens group 1, the illumination light loss is avoided, and the illumination effect is good.
The lighting lens group 3 of the present embodiment includes a first lens group 31 and a second lens group 32, the first lens group 31 is disposed between the annular light source 5 and the annular lighting diaphragm 4, and an image plane of the annular light source 5 imaged by the first lens group 31 is located on a side of the annular lighting diaphragm 4 far from the annular light source 5; the second lens group 32 is disposed between the illumination diaphragm 4 and the hollow reflector 2, and is used for adjusting the projection of the annular illumination light to the hollow reflector 2. The annular illumination light is converged by the first lens group 31 and then transmitted to the annular illumination diaphragm 4, the annular illumination diaphragm 4 shields the central part of the converged annular illumination light, so that the central part of the annular illumination light transmitted to the second lens group 32 is a cavity with a larger area, and the annular illumination light is modulated by the second lens group 32 and the eyepiece group 1 to form annular illumination light with a certain axial thickness.
Fig. 5 is a schematic diagram of a second embodiment of the illumination optical path system, in which the illumination lens group 3 of this embodiment includes a first lens group 31 and a second lens group 32, and both the first lens group 31 and the second lens group 32 are disposed between the annular light source 5 and the annular illumination diaphragm 4. The annular illumination light is converged by the first lens group 31 and then transmitted to the second lens group 32, the annular illumination light converged by the second lens group 32 is transmitted to the annular illumination diaphragm 4, the annular illumination diaphragm 4 shields the central part of the converged annular illumination light, so that the central part of the annular illumination light transmitted to the eyepiece group 1 is a cavity with a larger area, and the annular illumination light is modulated by the eyepiece group 1 to form annular illumination light with a certain axial thickness.
Fig. 6 is a schematic diagram of a third embodiment of the illumination optical path system, in which the illumination lens group 3 of this embodiment includes a first lens group 31 and a second lens group 32, and both the first lens group 31 and the second lens group 32 are disposed between the ring-shaped illumination diaphragm 4 and the hollow reflector 2. After the annular illumination light is formed by the beam of the annular illumination diaphragm 4, the peripheral light beams are shielded, the light beams at the central part are incident to the first lens group 31 at a larger angle, and are converged by the first lens group 31 to form the annular illumination light with a hollow center with a larger area, and then the annular illumination light with a certain axial thickness is formed after being modulated by the second lens group 32 and the ocular lens group 1.
Fig. 7 is a schematic diagram of a fourth embodiment of the illumination optical path system, in which the illumination lens group 3 of this embodiment only includes a first lens group 31, and the first lens group 31 is disposed between the hollow reflector 2 and the illumination aperture 4. After the annular illumination light is bundled by the annular illumination diaphragm 4, the central part of the annular illumination light is shielded to enable the central part to be a cavity with a larger area, and then the annular illumination light with certain axial thickness is formed after the annular illumination light is modulated by the first lens group 31 and the ocular lens group 1.
The annular light source 5 is not limited in the invention, and can be a single-wavelength light source or a multi-spectral light source. In the embodiment of the present invention, the annular light source 5 is a multispectral light source for emitting annular illumination light of different wave bands. The fundus imaging system 100 can image the fundus using different wavelength bands of illumination light, and obtain more detailed fundus tissue information using the difference in reflectance of different tissues for different wavelengths. The multispectral light source is more sensitive to image information and has higher requirements on signal to noise ratio, so the fundus image with better quality can be obtained when the multispectral light source is used by adopting the fundus shooting system 100 provided by the invention.
Further, the ocular lens group 1 includes one or more lenses, and an antireflection film is coated on the surface of the lens to reduce unnecessary reflection and reduce stray light, so as to improve the imaging quality of fundus images.
In addition, the imaging lens group 6 further includes a focusing lens group (not shown in the figure) capable of moving axially and a fixed condensing lens group (not shown in the figure), the focusing lens group and the fixed lens group are coaxially arranged, the front and back sequence of the focusing lens group and the fixed lens group is unlimited, and the focusing lens group and the condensing lens group can be arranged in front. The focusing lens group is adjusted through the focal length to compensate the ametropia of the detected eye, so that clear fundus images can be collected.
The fundus shooting system 100 provided by the embodiment of the invention further comprises a fixation mark 73 for guiding the eye to be detected to look at in different directions, so that images of different positions of the fundus can be conveniently shot. Specifically, the imaging module further includes a spectroscope 72 and a fixation mark 73. The beam splitter 72 is provided between the imaging mirror group 6 and the image collector 71, and the beam splitter 72 transmits a part of fundus reflection light to the image collector 71 and reflects the other part to the fixation index 73. The fixation mark 73 is arranged on a reflection light path of fundus reflection light reflected by the optical splitter 72, and the distance from the fixation mark 73 to the center of the optical splitter 72 is the same as the distance from the image collector 71 to the center of the optical splitter 72. That is, the fixation mark 73 and the image collector 71 are on the same imaging plane, but the optical path is divided by the beam splitter 72, the fixation mark 73 is located above the beam splitter 72, and the image collector 71 is located behind the beam splitter 72. When the fundus shooting system 100 shoots the eye to be detected, the fundus and the fixation mark 73, the fundus and the image collector 71 are in an optical conjugate position, light emitted by the fixation mark 73 is reflected by the light splitter 72 and then transmitted forward along the horizontal direction, and is modulated by the imaging lens group 6 and the ocular lens group 1 to be imaged on the fundus, so that the eye to be detected can see the clear fixation mark 73.
The fixation mark 73 includes a plurality of light emitting points arranged at intervals, and the plurality of light emitting points are arranged in parallel so as to be individually controllable to be switched. Preferably, the plurality of light emitting points of the fixation mark 73 are arranged in an array, and the light emitting points at different coordinates emit light individually according to the image acquisition requirement to guide the detected eye to look towards different light emitting points, thereby realizing the imaging of different parts of the fundus. The LED array is preferably selected from a plurality of light emitting points, the area is small, and the control is convenient.
Further, the fundus photographing system 100 further includes an eye alignment module for determining whether the eye to be detected is in a proper position in order to obtain a clear fundus image. The appropriate positions include: the eye pupil and the center of the hollow mirror 2 are in an optically conjugate position. Specifically, the eye alignment module includes a pupil illumination light source (not shown in the figure) and at least two pupil cameras 8. At least two pupil cameras 8 are arranged in the circumferential direction of the ocular lens group 1 at intervals and used for acquiring pupil dislocation images shot at different angles, and the front ends of the pupil cameras 8 are obliquely arranged close to the ocular lens group 1 so that the centers of the optical axes of the pupil cameras 8 are aligned with the pupils. During detection, a detected eye looks at the center of the ocular lens group 1, an infrared light source of the pupil illumination light source illuminates the eye pupil along which the detected eye is detected, the two pupil cameras 8 respectively shoot images of the eye pupil from different angles, the eye pupil images shot by the two pupil cameras 8 are overlapped, when the eye pupil images shot by the two pupil cameras 8 are staggered, the detected eye is not in a proper position, and when the eye pupil images shot by the two pupil cameras 8 are in a correct position, the detected eye is in a proper detection position.
The positions of the pupil illumination light sources are not limited, in an embodiment, the two pupil illumination light sources and the two pupil cameras 8 are arranged at intervals in the same circumferential direction of the ocular lens group 1, wherein the two pupil illumination light sources are respectively located above and below the ocular lens group 1, and the two pupil cameras 8 are respectively located on the left and right of the ocular lens group 1.
In addition, the pupil illumination light source comprises an infrared light source and a common illumination light source, the infrared light source has no influence on the detected eye, and the detected eye can be irradiated for a long time so as to observe the condition of the detected eye in real time. The ordinary illumination light source is used for providing illumination light when shooting pupil images. Further, the infrared light source is an infrared LED lamp, and the central wavelength of the infrared LED lamp is 850nm or 940 nm.
In addition, the collection range of the image collector 71 includes visible light and near infrared light, and generally, the image collector 71 is a two-bit array CMOS, or CCD.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fundus imaging system for imaging a fundus image of an eye to be examined, comprising:
the imaging module is used for receiving the reflected light of the fundus and imaging;
the objective lens module is arranged on the front side of the imaging module and comprises an ocular lens group and a hollow reflector which are arranged in front and at back, and the light reflecting surface of the hollow reflector faces the ocular lens group and is obliquely arranged; and the number of the first and second groups,
the illumination module is arranged on one side of the hollow reflector and faces the light reflecting surface of the hollow reflector, the illumination module comprises an annular light source, and an illumination lens group and an annular illumination diaphragm which are arranged between the annular light source and the hollow reflector, and the annular light source is used for generating annular illumination light;
the annular illuminating light is modulated by the annular illuminating diaphragm and the illuminating mirror group and then projected to the hollow reflector, then modulated by the ocular lens group to form annular illuminating light with certain axial thickness and then incident to the fundus, and fundus reflected light passes through the hollow area of the annular illuminating light, then modulated by the ocular lens group, passes through the hollow area of the hollow reflector and then is imaged by the imaging module.
2. An fundus camera system according to claim 1, wherein the centre of said hollow mirror is located at the image plane position of said ring-shaped light source after imaging by said illumination mirror group.
3. An fundus camera system according to claim 2, wherein said illumination mirror group comprises:
the first lens group is arranged between the annular light source and the annular lighting diaphragm and is used for converging the annular lighting light; and the number of the first and second groups,
and the second mirror group is arranged between the ring body illumination diaphragm and the hollow reflector and used for adjusting the projection of the annular illumination light to the hollow reflector.
4. The fundus imaging system of claim 1, wherein said set of eye lenses comprises one or more lenses, said lenses having an antireflection film coated on a surface thereof; and/or the presence of a gas in the gas,
the annular light source is a multispectral light source and is used for emitting annular illumination light with different wave bands.
5. An fundus camera system according to claim 1, wherein said imaging module comprises:
an image collector for receiving fundus reflection light; and the number of the first and second groups,
the imaging lens group is arranged between the hollow reflector and the image collector, and the center of the ocular lens group, the center of the hollow reflector and the center of the imaging lens group are arranged in a collinear way.
6. An fundus camera system according to claim 5, wherein said imaging lens assembly comprises an axially movable focusing lens assembly and a fixedly disposed condenser lens assembly, said focusing lens assembly and said condenser lens assembly being coaxially disposed.
7. An fundus camera system according to claim 6, wherein said imaging module further comprises:
the optical splitter is arranged between the imaging lens group and the image collector and is used for enabling one part of fundus reflection light to penetrate through the image collector and the other part of fundus reflection light to be reflected; and the number of the first and second groups,
the fixation mark is arranged on a reflection light path of fundus reflection light reflected by the optical splitter, and the distance from the fixation mark to the center of the optical splitter is the same as the distance from the image collector to the center of the optical splitter.
8. An eyeground photographing system as claimed in claim 7, characterized in that the fixation mark includes a plurality of light emitting points arranged at intervals, and a plurality of the light emitting points are arranged in parallel so as to be individually controllable to be switched; and/or the presence of a gas in the gas,
the acquisition range of the image collector comprises visible light and near infrared light; and/or the presence of a gas in the gas,
the image collector is a two-bit array CMOS or CCD.
9. An fundus camera system according to claim 1, further comprising an eye alignment module, said eye alignment module comprising:
a pupil illumination source, and,
the pupil cameras are arranged in the circumferential direction of the ocular lens group at intervals and used for acquiring pupil dislocation images shot at different angles, and the front ends of the pupil cameras are close to the ocular lens group and are obliquely arranged so that the centers of optical axes of the pupil cameras are aligned to the pupils.
10. An fundus camera system according to claim 9, wherein said pupil illumination light source is an infrared light source; and/or the presence of a gas in the gas,
the pupil illumination light source is an infrared LED lamp, and the central wavelength of the infrared LED lamp is 850nm or 940 nm.
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| CN201911351692.3A CN111166283A (en) | 2019-12-24 | 2019-12-24 | Fundus shooting system |
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| CN201911351692.3A CN111166283A (en) | 2019-12-24 | 2019-12-24 | Fundus shooting system |
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| CN112263216A (en) * | 2020-10-12 | 2021-01-26 | 深圳盛达同泽科技有限公司 | Refractive topographic map measuring instrument |
| CN112641423A (en) * | 2020-12-21 | 2021-04-13 | 北京理工大学 | Stray light eliminating type mydriasis-free eye fundus camera with large view field |
| CN115546883A (en) * | 2022-11-07 | 2022-12-30 | 浙江省人民医院 | Fundus image processing system |
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Application publication date: 20200519 |