WO2019085476A1

WO2019085476A1 - Eye imaging system, method, and device

Info

Publication number: WO2019085476A1
Application number: PCT/CN2018/090055
Authority: WO
Inventors: 张锐进; 黄晓燕; 陈文光
Original assignee: 上海美沃精密仪器股份有限公司
Priority date: 2017-10-31
Filing date: 2018-06-06
Publication date: 2019-05-09
Also published as: CN107997737A; CN107997737B

Abstract

An eye imaging system comprises an optical path control module, a light source module, a light sensing module (33), and a display module (34). The eye imaging system comprises multiple optical paths. One optical path is a path of a light ray generated by the light source module passing through the optical path control module and then proceeding to an eye (1). A returning light ray (1) reflected by the eye (1) passes through the optical path control module and then projects to the light sensing module (33) to be displayed on the display module (34). The eye imaging system achieves high-resolution imaging of a fundus lesion. The eye imaging system incorporates a technique of pupil positioning, and uses an LED light source to illuminate a pupil (11) of an eye to and acquires reflected light from the pupil (11) to determine an accurate operation distance.

Description

Eye imaging system, method and device

Technical field

The present invention relates to an imaging system, and in particular to an ocular imaging system, method and apparatus therefor.

Background technique

With the continuous advancement and development of science and technology, people pay more attention to the primary screening of eye diseases, especially the screening of fundus diseases such as diabetic retinopathy. The traditional eye imaging system is bulky, difficult to carry, expensive and unpopular, cumbersome to operate, and difficult to apply to patients in bed, and is gradually replaced by a handheld eye imaging system, but the general eye imaging system is due to the optical system. The design is simple, there are imaging problems such as uneven illumination, inaccurate working distance and chromatic aberration leading to defocusing, especially the working distance is not accurate. In operation, the image is often imaged before and after the working distance, and the resolution of the obtained eye image cannot reach the maximum. Excellent effect; there is also the elimination of chromatic aberration. The current solution is generally to use achromatic lens in optical design, which reduces the influence of chromatic aberration on imaging to some extent, but still can't do both infrared and white illumination. HD imaging at the same working position.

Summary of the invention

In view of the deficiencies in the prior art, it is an object of the present invention to provide an ocular imaging system, method and apparatus therefor.

An eye imaging system according to the present invention includes an optical path control module, a light source module, a photosensitive module, and a display module;

The ocular imaging system includes a plurality of optical paths;

An optical path generates light for the light source module to be transmitted to the eye through the optical path control module, and the light reflected by the eye is projected to the photosensitive module through the optical path control module, and displayed on the display module;

The eye imaging system further includes a pupil positioning module;

An optical path generates light for the fixation lamp assembly through the optical path control module and the pupil is directed to the eye;

The other optical path generates light for the pupil positioning module to be transmitted to the pupil through the optical path control module, and the light reflected by the pupil is projected to the photosensitive module through the optical path control module and displayed on the display module.

Preferably, further comprising a focusing module;

Adjust the front and rear position of the photosensitive module by adjusting the focusing module.

Preferably, a color difference eliminating module is further included;

The color difference elimination module comprises an infrared cut filter, a full transparent optical plate;

The eye imaging system further includes a button;

The button is used to control the position movement of the color difference eliminating module;

When the button is pressed, the infrared cut filter moves to a position corresponding to the photosensitive module;

When the button is released, the color difference eliminating module returns to the original state, that is, the fully transparent optical plate moves to a position corresponding to the photosensitive module.

Preferably, the optical path control module comprises an aspherical mirror, a beam splitter and a rear lens group;

The aspherical mirror and the rear lens group are used to control the optical path of the light beam;

The beam splitter is used to merge or split the optical path.

Preferably, the light source module comprises a lighting component, a fixation lamp component;

The illumination assembly is configured to generate imaging light;

The fixation lamp assembly is used to direct the direction of the line of sight of the eye.

Preferably, the lighting assembly comprises a plurality of lighting lamps;

The fixation lamp assembly includes a plurality of sub-fixed lights;

The plurality of sub-fixed lights and the plurality of illumination lamps are all disposed at different positions.

Preferably, an optical path generates light for the illumination component to be incident on the eye through the aspherical mirror and the pupil, and the light reflected by the eye is projected to the photosensitive module through the pupil, the aspherical mirror, the beam splitter and the rear lens group, and is displayed. On the display module;

An optical path generates light for the fixation lamp assembly, and then passes through the beam splitter, the aspherical mirror, and the pupil to the eye;

The other optical path generates light for the pupil positioning module to be transmitted to the pupil through the aspherical mirror. The light reflected by the pupil is projected to the photosensitive module through the aspherical mirror, the beam splitter and the rear lens group, and displayed on the display module.

The present invention also provides an eye imaging method comprising the step of imaging an eye using the above-described eye imaging system.

The present invention also provides an eye imaging device, comprising the above-described eye imaging system, further comprising a lens and a host;

The optical path control module and the light source module are all disposed in the lens;

The photosensitive module, the infrared cut filter, the fully transparent optical plate, the display screen, and the adjusting component are all disposed in the host;

The button is disposed outside the host;

The position of the infrared cut filter and the position of the full transparent optical plate are parallel to the positions of the photosensitive module;

The position of the infrared cut filter and the position of the fully transparent optical plate are both at a set angle with the position of the adjustment component;

The position of the infrared cut filter and the full transparent optical plate are both disposed on one side of the photosensitive module;

The display screen is disposed on the other side of the photosensitive module;

The optical path control module includes an aspherical mirror, a pupil positioning module, a beam splitter, and a rear lens group;

The aspherical mirror, the beam splitter, and the rear lens group are sequentially disposed in the lens from left to right;

The pupil positioning module is disposed on both sides of the beam splitter;

The light source module includes a lighting assembly and a fixation lamp assembly;

The illumination assembly and the fixation lamp assembly are respectively disposed on two sides of the beam splitter.

Preferably, the pupil positioning module generates a plurality of light sources;

When the distance between the eye imaging device and the pupil is not within the set distance, the first spot is generated and the first imaging is presented;

When the distance between the eye imaging device and the pupil is within a set distance, generating a second spot and presenting a second image;

The size of the first spot is larger than the size of the second spot;

The brightness of the first spot is smaller than the brightness of the second spot;

The sharpness of the first image is lower than the sharpness of the second image.

Compared with the prior art, the present invention has the following beneficial effects:

1. The eye imaging system provided by the present invention can display high definition imaging of fundus lesions.

2. The eye imaging system provided by the present invention introduces a pupil positioning technique, uses an LED light source to illuminate a pupil of a human eye, collects pupil reflected light, and thereby determines an accurate working distance.

3. The eye imaging system provided by the invention adds a fixation light path to the optical system, and fixes the line of sight of the human eye to obtain the fundus image more easily, and guides the human eye to observe different line of sight directions, and obtains images of different regions of the human eye. Improve the possibility of detecting fundus lesions.

4. The eye imaging system provided by the invention utilizes the switching of the optical plate in the filter assembly to compensate the chromatic aberration of the imaging of the infrared and white light sources, so that the imaging focus of the two is completely consistent, and the optical plate generally adopts an infrared cut filter. It cuts into the optical system during white light illumination imaging, and subtly suppresses the influence of residual light left by the infrared light source on imaging.

DRAWINGS

Other features, objects, and advantages of the present invention will become apparent from the Detailed Description of Description

FIG. 1 is a schematic structural view of an eye imaging system provided by the present invention.

2 is a schematic view showing the operation of filter switching of the eye imaging system provided by the present invention.

FIG. 3 is a schematic view showing the operation of pupil positioning of the eye imaging system provided by the present invention.

4 is a schematic diagram of an interface under the condition that the pupil positioning of the ocular imaging system provided by the present invention is inaccurate.

FIG. 5 is a schematic diagram of an interface under the condition that the pupil imaging of the eye imaging system provided by the present invention is accurate.

The figure shows:

Detailed ways

The invention will now be described in detail in connection with specific embodiments. The following examples are intended to further understand the invention, but are not intended to limit the invention in any way. It should be noted that a number of changes and modifications may be made by those skilled in the art without departing from the inventive concept. These are all within the scope of protection of the present invention.

An eye imaging system according to the present invention includes an optical path control module, a light source module, a light sensing module 33, and a display module 34; the eye imaging system includes a plurality of optical paths; and an optical path generates light for the light source module The optical path control module is directed to the eye 1, the light reflected by the eye 1 is projected to the photosensitive module 33 via the optical path control module, and displayed on the display module 34; the eye imaging system further includes a pupil positioning module 22; An optical path generates light for the fixation lamp assembly 24 to pass through the optical path control module and the pupil 11 to the eye 1; the other optical path generates light for the pupil positioning module 22 to be transmitted to the pupil 11 through the optical path control module, and the pupil 11 reflects The returned light is projected to the photosensitive module 33 via the optical path control module and displayed on the display module 34.

The eye imaging system further includes a focusing module 36; the front and rear positions of the photosensitive module 33 are adjusted by adjusting the focusing module 36.

The ocular imaging system further includes a chromatic aberration eliminating module; the chromatic aberration eliminating module includes an infrared cut filter 32, a full opaque optical plate 31; preferably, the chromatic aberration eliminating module includes only an infrared cut filter 32; The eye imaging system further includes a button 35 for controlling positional movement of the color difference eliminating module; when the button 35 is pressed, the infrared cut filter 32 is moved to correspond to the photosensitive module 33 When the button 35 is released, the chromatic aberration eliminating module returns to the original state, that is, the full permeable optical plate 31 is moved to a position corresponding to the photosensitive module 33. It should be noted that the button 35 has many functions. When the button 35 is pressed, in the eye imaging system provided by the present invention, the infrared light source is first turned off, the fantasy infrared cut filter 32 is driven, and the white light source is driven to flash. .

The optical path control module includes an aspherical mirror 21, a beam splitter 25, and a rear lens group 26; the aspherical mirror 21 and the rear lens group 26 are used to control the optical path of the light beam; and the beam splitter 25 is used to merge or split the optical path.

The light source module includes a lighting assembly 23 and a fixation lamp assembly 24; the illumination assembly 23 is for generating imaging light; the fixation lamp assembly 24 is for guiding the line of sight direction of the eye 1.

The lighting assembly 23 includes a plurality of illumination lamps; the fixation lamp assembly 24 includes a plurality of sub-fixed lights; the plurality of sub-fixed lights and the plurality of illumination lamps are each disposed at different locations.

In the eye imaging system provided by the present invention, an optical path generates light for the illumination component 23 to be incident on the eye 1 through the aspherical mirror 21 and the pupil 11, and the light reflected by the eye 1 passes through the pupil 11, the aspherical mirror 21, The beam splitter 25 and the lens rear group 26 are projected to the photosensitive module 33 and displayed on the display module 34; an optical path is generated by the fixation lamp assembly 24, and the light is sequentially transmitted to the eye 1 through the beam splitter 25, the aspherical mirror 21, and the pupil 11; The other optical path generates light for the pupil positioning module 22 to be incident on the pupil 11 through the aspherical mirror 21, and the light reflected by the pupil 11 is projected to the photosensitive module 33 through the aspherical mirror 21, the beam splitter 25, and the lens rear group 26, and Displayed on display module 34.

The present invention also provides an eye imaging device, comprising the above-described eye imaging system, further comprising a lens 2, a host 3; the optical path control module and the light source module are all disposed in the lens 2; the photosensitive module 33, infrared The cut filter 32, the full transparent optical plate 31, the display screen, and the adjustment component are all disposed in the host 3; the button 35 is disposed outside the host 3; the position of the infrared cut filter 32 and the full transparent optical plate 31 The positions of the photosensitive module 33 are parallel to each other; the position of the infrared cut filter 32 and the position of the full transparent optical plate 31 are both at a set angle with the position of the adjustment component; the infrared cut filter 32 The position and the full transparent optical plate 31 are disposed on one side of the photosensitive module 33; the display screen is disposed on the other side of the photosensitive module 33; the optical path control module includes an aspherical mirror 21, a beam splitter 25 and a lens rear group 26; The pupil positioning module 22 is disposed on both sides of the beam splitter 25; the aspherical mirror 21, the pupil positioning module 22, the beam splitter 25, and the rear lens group 26 are sequentially disposed in the lens 2 from left to right; the light source module package An illumination assembly 23, the fixation lamp assembly 24; the illumination assembly 23, the fixation lamp assembly 24 are respectively provided on both sides of the beam splitter 25.

The pupil positioning module 22 generates one or more light sources; when the distance between the eye imaging device and the pupil 11 is not within the set distance, the first spot is generated and the first imaging is presented; when the eye imaging device and the pupil 11 When the distance is within the set distance, the second spot is generated and presents a second image; the size of the first spot is larger than the size of the second spot; the brightness of the first spot is smaller than the brightness of the second spot; The sharpness of the first image is lower than the sharpness of the second image.

The photosensitive module 33 is preferably a photosensitive element, more preferably a CCD (Charge-coupled Device) or a Complementary Metal Oxide Semiconductor (CMOS).

The invention is further described below:

As shown in FIG. 1, the illumination assembly 23 generates aiming light, which passes through the aspherical mirror 21 and the pupil of the human eye, that is, the pupil 11 enters the human eye, that is, the eye 1, and the fundus of the human eye reflects the light back to the lens 2 and images the photosensitive element through The display screen displays in real time, through the focusing component, that is, the focusing module 36 moves the position of the photosensitive element to adjust the focal length to compensate for the defocus caused by different diopter of the human eye. When the aiming image is clear, press the photo button 35, the lighting component The imaging light is again generated, and the fundus image of the human eye is similarly imaged on the photosensitive element, displayed on the display screen, and the image is stored.

The aiming light generated by the illumination assembly 23 allows the doctor to clearly see the patient's eye image while avoiding the aiming light directly on the patient's eye, thereby solving the problem of causing the patient's eye discomfort.

Because the aiming light is generally an infrared light source, and the imaging light is generally a white light source, both of which are imaged on the photosensitive element through the same optical path, color difference is generated due to the difference in wavelength, and a filter component, that is, a color difference eliminating module, is added before the photosensitive element. As shown in FIG. 2, when the aiming light is working, there is a full transparent optical plate 31 or no optical plate in the optical path, and when the photographing button 35 is pressed for imaging, it is switched to the infrared cut filter 32, in other words, The infrared cut filter 32 is cut into the optical path, and the difference between the two is used to eliminate the chromatic aberration. At the same time, the infrared cut filter 32 is cut into the optical path, and the residual light of the aiming light can also be filtered to achieve clear imaging. When the button 35 is released, the fully transmissive optical plate 31 is cut into the optical path.

The human eye can not fix the line of sight direction for a long time without a specific observation target, and the random moving line of sight increases the difficulty of aiming. The present invention introduces a fixation lamp assembly 24, which includes a plurality of sub-fixed lights; The sub-fixed lamp is preferably a light-emitting diode (LED); the LED light source is passed through the beam splitter 25, enters the optical path and finally enters the human eye, and at the interface of the display screen, the sub-solid at different positions can be selected. The light is used to guide the direction of the human eye, reduce the difficulty of aiming, and obtain images of different regions of the eye of the human eye, thereby improving the possibility of detecting fundus lesions.

The sub-fixing lamp helps determine the range of aiming, but the distance between the eye imaging device provided by the present invention and the pupil of the human eye, that is, the working distance of the eye imaging device is not easily determined, and the eye imaging device provided by the present invention utilizes the pupil positioning assembly. 22, as shown in FIG. 3, the pupil positioning component 22 is placed on both sides of the beam splitter 25 to generate a plurality of light sources, the number of the light sources is preferably two; the two light sources are more preferably two point light sources, The aspherical mirror 21 is irradiated on the pupil of the human eye, and the reflected light is imaged on the photosensitive element through the lens 2 and displayed on the display screen. When the distance between the eye imaging device and the pupil of the human eye is not at the working distance, two spots on the display screen That is, the two point light sources are diffused large round spots, and the brightness is dark, that is, as shown in FIG. 4, the image obtained by the photographing cannot achieve the clearest effect, and the distance between the eye imaging device and the pupil of the human eye is adjusted. When the distance between the two is less than or less than the working distance, the two spots on the display screen are concentrated spot lights, and the brightness is brighter, as shown in Figure 5, at this time, the camera will get the clearest fundus. Like.

The specific embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the specific embodiments described above, and various changes or modifications may be made by those skilled in the art without departing from the scope of the invention. The features of the embodiments and the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

An eye imaging system, comprising: an optical path control module, a light source module, a photosensitive module (33), and a display module (34);

The ocular imaging system includes a plurality of optical paths;

An optical path generates light for the light source module to be transmitted to the eye portion (1) via the optical path control module, and the light reflected by the eye portion (1) is projected to the photosensitive module (33) through the optical path control module, and displayed on the display module ( 34)

The eye imaging system further includes a pupil positioning module (22);

An optical path for the fixation lamp assembly (24) to generate light through the optical path control module, the pupil (11) to the eye (1);

The other optical path is generated by the pupil positioning module (22), and the light is transmitted to the pupil (11) through the optical path control module, and the light reflected by the pupil (11) is projected to the photosensitive module (33) through the optical path control module, and is displayed. On the display module (34).
The ocular imaging system according to claim 1, further comprising a focusing module (36);

The front and rear positions of the photosensitive module (33) are adjusted by adjusting the focusing module (36).
The ocular imaging system according to claim 1 or 2, further comprising a chromatic aberration eliminating module;

The color difference elimination module comprises an infrared cut filter (32) and a full transparent optical plate (31);

The eye imaging system further includes a button (35);

The button (35) is used to control the position movement of the color difference eliminating module;

When the button (35) is pressed, the infrared cut filter (32) moves to a position corresponding to the photosensitive module (33);

When the button (35) is released, the chromatic aberration eliminating module returns to the original state, that is, the full permeable optical plate (31) is moved to a position corresponding to the photosensitive module (33).
The ocular imaging system according to claim 1, wherein the optical path control module comprises an aspherical mirror (21), a beam splitter (25) and a rear lens group (26);

The aspherical mirror (21) and the rear lens group (26) are used to control the optical path of the light beam;

The beam splitter (25) is used to merge or split the optical path.
The ocular imaging system according to claim 1, wherein the light source module comprises a lighting assembly (23), a fixation lamp assembly (24);

The illumination assembly (23) is for generating imaging light;

The fixation lamp assembly (24) is used to direct the line of sight of the eye (1).
The ocular imaging system of claim 5, wherein the illumination assembly (23) comprises a plurality of illumination lamps;

The fixation lamp assembly (24) includes a plurality of sub-fixed lights;

The plurality of sub-fixed lights and the plurality of illumination lamps are all disposed at different positions.
The ocular imaging system according to any one of claims 1 to 6, wherein an optical path generates light for the illumination unit (23) to be incident on the eye through the aspherical mirror (21) and the pupil (11) ( 1) above, the light reflected by the eye (1) is projected to the photosensitive module (33) through the pupil (11), the aspherical mirror (21), the beam splitter (25), and the rear lens group (26), and is displayed on Display module (34);

An optical path for the fixation lamp assembly (24) to generate light sequentially through the beam splitter (25), the aspherical mirror (21), the pupil (11) to the eye (1);

The other optical path generates light for the pupil positioning module (22) to be incident on the pupil (11) through the aspherical mirror (21), and the light reflected by the pupil (11) passes through the aspherical mirror (21) and the beam splitter (25). And the rear lens group (26) is projected to the photosensitive module (33) and displayed on the display module (34).
An eye imaging method comprising the step of imaging an eye using the eye imaging system of claims 1-8.
An eye imaging device, comprising the eye imaging system according to any one of claims 1 to 8, further comprising a lens (2), a host (3);

The optical path control module and the light source module are all disposed in the lens (2);

The photosensitive module (33), the infrared cut filter (32), the fully transparent optical plate (31), the display screen, and the adjusting component are all disposed in the host (3);

The button (35) is disposed outside the host (3);

The position of the infrared cut filter (32) and the position of the full transparent optical plate (31) are parallel to the positions of the photosensitive module (33);

The position of the infrared cut filter (32) and the position of the fully transparent optical plate (31) are both at a set angle with the position of the adjustment assembly;

The position of the infrared cut filter (32) and the full transparent optical plate (31) are both disposed on one side of the photosensitive module (33);

The display screen is disposed on the other side of the photosensitive module (33);

The optical path control module includes an aspherical mirror (21), a pupil positioning module (22), a beam splitter (25), and a rear lens group (26);

The aspherical mirror (21), the beam splitter (25), and the rear lens group (26) are sequentially disposed in the lens (2) from left to right;

The pupil positioning module (22) is disposed on both sides of the beam splitter (25);

The light source module includes a lighting assembly (23) and a fixation lamp assembly (24);

The illumination assembly (23) and the fixation lamp assembly (24) are respectively disposed on both sides of the beam splitter (25).
The ocular imaging system of claim 7, wherein the pupil positioning module (22) generates a plurality of light sources;

When the distance between the eye imaging device and the pupil (11) is not within the set distance, the first spot is generated and the first imaging is presented;

When the distance between the eye imaging device and the pupil (11) is within a set distance, a second spot is generated and a second imaging is presented;

The size of the first spot is larger than the size of the second spot;

The brightness of the first spot is smaller than the brightness of the second spot;

The sharpness of the first image is lower than the sharpness of the second image.