CN209966343U

CN209966343U - Lens module and fundus camera with same

Info

Publication number: CN209966343U
Application number: CN201822234709.4U
Authority: CN
Inventors: 李超宏
Original assignee: SUZHOU MICROCLEAR MEDICAL INSTRUMENTS CO Ltd
Current assignee: SUZHOU MICROCLEAR MEDICAL INSTRUMENTS CO Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-01-21
Anticipated expiration: 2028-12-28

Abstract

The utility model provides a lens module for converge from the formation of image light of eye ground reflection, include: a first lens group, an illumination module and a second lens group which are arranged in order from the fundus side to the imaging side; the lighting module comprises a plurality of light-emitting elements and a shading piece; the plurality of light-emitting elements are in a common circle and are uniformly distributed on the circumference; the shading piece is cylindrical or truncated cone-shaped, and a light through groove penetrating through the shading piece is formed in the shading piece; the light-emitting element is matched with the shading piece, so that the illumination range of the light-emitting element is annular. Compared with the prior art, the utility model discloses the lighting system simple structure of lens module can realize the even illumination to can effectively reduce the influence of reverberation to imaging system.

Description

Lens module and fundus camera with same

Technical Field

The utility model relates to a lens module and have eye ground camera of this lens module.

Background

An eyeground camera belongs to the field of medical imaging and is used for acquiring an image of retina of a human eye so as to facilitate medical staff to check eyeground diseases or assist the medical staff to judge the state of illness of other organs. Since the blood vessels of the fundus are the only blood vessels that can be directly observed by the human body through the body surface, medical personnel can check whether the optic nerve, retina, choroid and refraction medium of the fundus have pathological changes through the fundus camera, and can also assist in diagnosing and judging the disease conditions of other system diseases through the fundus camera, for example, screening retinal pictures to detect cerebral infarction, cerebral hemorrhage, cerebral arteriosclerosis, brain tumors, diabetes, nephropathy, hypertension, retinopathy of prematurity, glaucoma, age-related macular degeneration and the like. Since the earlier detection of these diseases is more advantageous for clinical treatment, fundus cameras are widely used for clinical screening of fundus diseases, and are indispensable medical instruments.

However, in order to simplify the illumination system, the lens module of the existing hand-held fundus camera generally uses an off-axis illumination system, namely: the illumination lamp irradiates on the objective lens obliquely from the optical axis. Therefore, the illumination of the objective lens by the illuminating lamp is extremely uneven, and the imaging quality is affected. Moreover, the reflected light formed by the illumination light emitted by the illumination lamp after being reflected by the surface of the objective lens can also seriously interfere the imaging, so that the imaging quality is reduced.

In view of the above problems, it is necessary to provide a new lens module to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a lens module and have eye ground camera of this lens module, the lighting system simple structure of lens module can realize the uniform illumination to can effectively reduce the influence of reverberation to imaging system.

For solving the technical problem, the technical scheme of the utility model is realized like this:

a lens module for converging imaging light reflected from a fundus of a eye, comprising: a first lens group, an illumination module and a second lens group which are arranged in order from the fundus side to the imaging side; the lighting module comprises a plurality of light-emitting elements and a shading piece; the plurality of light-emitting elements are in a common circle and are uniformly distributed on the circumference; the shading piece is cylindrical or truncated cone-shaped, and a light through groove penetrating through the shading piece is formed in the shading piece; the light-emitting element is matched with the shading element, so that the illuminating light emitted by the light-emitting element is emitted to the cornea in a ring shape.

Further, the first lens group comprises a first lens proximate to the lighting module, the first lens having a first surface proximate to the lighting module; the light-passing groove comprises an incident port close to the first lens group and an emergent port far away from the first lens group; the light emitting element and the light shielding member are configured to make the irradiation area of the reflected light formed by the illumination light emitted by the light emitting element after being reflected by the first surface not coincide with the emergent port.

Further, the first lens group comprises a first lens proximate to the lighting module, the first lens having a first surface proximate to the lighting module; the light-passing groove comprises an incident port close to the first lens group and an emergent port far away from the first lens group; the light emitting element and the light shielding piece are configured to enable an irradiation area of reflected light formed after illumination light emitted by the light emitting element is reflected by the first surface to be overlapped with the exit port part, and the area of the overlapped part is smaller than half of the area of the exit port.

Further, the first surface is convex or concave.

Furthermore, the lighting module also comprises a diaphragm, and the diaphragm is matched with the light shading piece to form an annular groove so that the lighting light emitted by the light emitting element can pass through the annular groove.

Further, the projections of the annular groove and the light-emitting element on the plane where the first lens is located are overlapped.

Further, the second lens group has a second optic proximate to the first optic; defining a connecting line of the same side edges of the first lens and the second lens as a boundary line; the light-transmitting groove is in a round table shape, the included angle between a bus and the optical axis is not smaller than the included angle between the boundary line and the optical axis, and the boundary line is located between the bus and the optical axis.

Further, the light emitting elements include 4 first light emitting elements and 4 second light emitting elements, and the first light emitting elements and the second light emitting elements are arranged at intervals.

Further, the first light emitting element emits visible light, and the second light emitting element emits invisible light.

A fundus camera includes the aforementioned lens module.

The utility model has the advantages that: compared with the prior art, the utility model discloses the lighting system simple structure of lens module can realize the even illumination to can effectively reduce the influence of reverberation to imaging system.

Drawings

Fig. 1 is a schematic structural diagram of the lens module according to the present invention.

Fig. 2 is an illumination optical path diagram of an illumination module of the lens module shown in fig. 1.

Fig. 3 is a first reflected light path diagram of an illumination module of the lens module shown in fig. 1.

Fig. 4 is a second reflected light path diagram of an illumination module of the lens module shown in fig. 1.

Fig. 5 is a third reflected light path diagram of an illumination module of the lens module shown in fig. 1.

Fig. 6 is a schematic view showing the distribution of light-emitting elements.

Fig. 7 is a schematic view showing another distribution of light-emitting elements.

Fig. 8 is a schematic cross-sectional view of the light blocking member.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following detailed description of embodiments of the present invention will be described with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the same are merely exemplary and the invention is not limited to these embodiments.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not relevant to the present invention are omitted.

In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, the lens module 100 of the present invention is used for converging the imaging light reflected from the fundus of the eyeball 40 of the observed person to form a fundus image of the eyeball 40 of the observed person in the imaging module 50. The lens module 100 includes a first lens group 10, an illumination module 20, and a second lens group 30 arranged in this order from the fundus side EYE to the imaging side IMG. The first lens group 10 and the second lens group 30 may be a single lens, or a lens group composed of a plurality of lenses, or a cemented lens formed by a plurality of lenses, or a lens group formed by a cemented lens and one or more lenses. The first lens group 10 includes a first lens 11 adjacent to the lighting module 20, and the first lens 11 has a first surface 111 adjacent to the lighting module 20. The second lens group 30 has a second lens 31 close to the first lens 11. The line connecting the same side edges of the first lens 11 and the second lens 31 is defined as a boundary line 60 (shown in fig. 1).

Referring to fig. 1, 6 and 8, the lighting module 20 includes a circular lamp base 21, a plurality of light emitting devices 22 mounted on the lamp base 21, and a light shielding member 23 engaged with the light emitting devices 22. The light emitting elements 22 are concentric and uniformly distributed on the circumference. The arrangement is such that the radiation distribution of the light emitting elements 22 on the first lens group 10 is relatively uniform. The light emitting element 22 includes a first light emitting element 221 that emits visible light and a second light emitting element 222 that emits invisible light, and the first light emitting element 221 and the second light emitting element 222 are provided at intervals. Preferably, each of the first light emitting element 221 and the second light emitting element 222 is 4, so that the problems of uniform radiation distribution and spatial distribution of the light emitting elements 22 can be simultaneously solved, and the light emitting elements 22 on the lamp holder 21 are not crowded while the lighting module 20 realizes uniform lighting. The first light emitting element 221 is used for capturing a fundus image, and the second light emitting element 222 is used for image preview. Because the eyes cannot sense the invisible light, when the eyeball is irradiated by the invisible light, the pupil cannot contract, so that a user can observe the fundus image in an image preview mode conveniently, the best preview image is obtained by adjusting the distance, the angle, the focal length and the like between the lens module 100 and the eyeball, and then the fundus is photographed, so that the probability of photographing the best fundus image is effectively improved. Moreover, the invisible light can not stimulate eyes, so that discomfort can not be brought to the eyes, and the use experience of a user is effectively improved. In the present embodiment, the first light emitting element 221 and the second light emitting element 222 are concentric, but in other embodiments, the first light emitting element 221 and the second light emitting element 222 may not be concentric. For example, as shown in fig. 7, 4 first light emitting elements 221 are concentric and uniformly distributed on the circumference; the 4 second light-emitting elements 222 are concentric and uniformly distributed on the circumference; however, the first and second

light emitting elements

221 and 222 are not co-circular.

Referring to fig. 8 and fig. 1, the light shielding member 23 is substantially cylindrical or truncated cone-shaped, and a light passing groove 231 is formed through the light shielding member 23 for passing the imaging light reflected from the fundus oculi. The light shielding member 23 is matched with the light emitting device 22, so that the illumination range of the light emitting device 22 is annular, and the illumination light emitted by the light emitting device 22 is emitted to the cornea in an annular form. Since the corneal surface is convex, the angle between normal 80 and optical axis 70 increases from the center of the cornea to the periphery. Therefore, the reflected light generated by the illumination light emitted by the light emitting device 22 at the periphery of the cornea does not enter the lens module 100, and the reflected light from the cornea can be prevented from affecting the imaging quality, as shown in fig. 2. This arrangement prevents reflected light from directly striking the central portion of the cornea and entering the lens module 100. The light-passing groove 231 is in a circular truncated cone shape, an included angle between the bus 230 and the optical axis 70 is not smaller than an included angle between the boundary line 60 and the optical axis 70, and the boundary line 60 is located between the bus 230 and the optical axis 70. This arrangement is advantageous for the light-shielding member 23 to collect the image light. The light-passing groove 231 includes an incident port 232 close to the first lens group 10 and an exit port 233 facing away from the first lens group 10. As shown in fig. 3, the light emitting device 22 and the light shielding member 23 are configured such that an irradiation area of the illumination light emitted by the light emitting device 22 and reflected light formed by reflecting the illumination light by the first surface 111 partially overlaps with the exit port 233, and an area of the overlapped portion is smaller than half of an area of the exit port, that is: only a small portion of the reflected light formed by the light emitting element 22 after being reflected by the first surface 111 enters the exit port 233. So set up, can effectively reduce the influence of reverberation to the formation of image quality to can promote the formation of image quality betterly. As shown in fig. 4, preferably, the light emitting device 22 and the light shielding member 23 are configured such that an irradiation area of reflected light formed by the illumination light emitted by the light emitting device after being reflected by the first surface 111 does not coincide with the exit port 233, that is: the reflected light formed by the light emitting element 22 after being reflected by the first surface 111 does not enter the exit port 233. So set up, can avoid the influence of reverberation to the formation of image quality completely to effectively promoted the formation of image quality. In this embodiment, the first surface 111 is convex, but in other embodiments, the first surface 111 may be concave, as shown in fig. 5. Referring to fig. 2, preferably, the illumination module 20 further includes a diaphragm 24, and the diaphragm 24 and the light shielding member 23 cooperate to form an annular groove 25, so that the illumination light emitted by the light emitting element 22 passes through the annular groove. With this arrangement, the illumination range of the light emitting element 22 can be further adjusted conveniently. The projection of the annular groove 25 and the light emitting element 22 on the plane of the first lens 11 at least partially coincide.

The utility model also provides an eye ground camera, eye ground camera includes lens module 100.

Compared with the prior art, the utility model discloses lens module 100's lighting system simple structure can realize the even illumination to can effectively reduce the influence of reverberation to imaging system.

It is particularly pointed out that equivalent variations to those skilled in the art in light of the teachings of the present invention that are intended to be included within the scope of the appended claims.

Claims

1. A lens module for converging imaging light reflected from a fundus of a eye, comprising: a first lens group, an illumination module and a second lens group which are arranged in order from the fundus side to the imaging side; the lighting module comprises a plurality of light-emitting elements and a shading piece; the plurality of light-emitting elements are in a common circle and are uniformly distributed on the circumference; the shading piece is cylindrical or truncated cone-shaped, and a light through groove penetrating through the shading piece is formed in the shading piece; the light emitting element is matched with the light shading piece, so that the illuminating light emitted by the light emitting element is emitted to the cornea in a ring shape.

2. The lens module of claim 1, wherein: the first lens group comprises a first lens proximate to the lighting module, the first lens having a first surface proximate to the lighting module; the light-passing groove comprises an incident port close to the first lens group and an emergent port far away from the first lens group; the light emitting element and the light shielding member are configured to make the irradiation area of the reflected light formed by the illumination light emitted by the light emitting element after being reflected by the first surface not coincide with the emergent port.

3. The lens module of claim 1, wherein: the first lens group comprises a first lens proximate to the lighting module, the first lens having a first surface proximate to the lighting module; the light-passing groove comprises an incident port close to the first lens group and an emergent port far away from the first lens group; the light emitting element and the light shielding piece are configured to enable an irradiation area of reflected light formed after illumination light emitted by the light emitting element is reflected by the first surface to be overlapped with the exit port part, and the area of the overlapped part is smaller than half of the area of the exit port.

4. The lens module of claim 2 or 3, wherein: the first surface is convex or concave.

5. The lens module of claim 1, wherein: the lighting module also comprises a diaphragm, and the diaphragm is matched with the shading piece to form an annular groove so that the lighting light emitted by the light-emitting element can pass through the annular groove.

6. The lens module of claim 5, wherein: the first lens group comprises a first lens close to the lighting module, and the projections of the annular groove and the light-emitting element on the plane where the first lens is located are overlapped.

7. The lens module of claim 1, wherein: the first lens group comprises a first lens close to the lighting module, and the second lens group comprises a second lens close to the first lens; defining a connecting line of the same side edges of the first lens and the second lens as a boundary line; the light-transmitting groove is in a round table shape, the included angle between a bus and the optical axis is not smaller than the included angle between the boundary line and the optical axis, and the boundary line is located between the bus and the optical axis.

8. The lens module of claim 1, wherein: the light emitting elements comprise 4 first light emitting elements and 4 second light emitting elements, and the first light emitting elements and the second light emitting elements are arranged at intervals.

9. The lens module of claim 8, wherein: the first light emitting element emits visible light, and the second light emitting element emits invisible light.

10. An eye fundus camera, characterized in that: comprising a lens module according to any one of claims 1 to 9.