CN111419176A

CN111419176A - Fundus camera with image transmission function, fundus camera system and control method thereof

Info

Publication number: CN111419176A
Application number: CN202010521291.4A
Authority: CN
Inventors: 罗鑫凯; 胡飞; 王方
Original assignee: Beijing Peredoc Technology Co ltd
Current assignee: Beijing Peredoc Technology Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2020-07-17
Anticipated expiration: 2040-06-10
Also published as: CN111419176B

Abstract

The invention provides an eyeground camera with an image transmission function, an eyeground camera system and a control method thereof. The fundus camera includes an optical system and a control unit. The optical system is used for generating focusing light rays required by a focusing process and lighting light rays required by a photographing process, and the control unit is used for controlling the optical system.

Description

Fundus camera with image transmission function, fundus camera system and control method thereof

Technical Field

The present invention relates to the field of photographing apparatuses, and more particularly, to an eye fundus camera with an image transmission function, an eye fundus camera system, and a control method thereof.

Background

A fundus camera is an imaging tool for taking an image of a human eye (fundus). Specifically, a fundus camera illuminates the fundus, and then receives light reflected by the fundus and focuses it onto an image collector to image the fundus.

One type of improved fundus camera in the prior art is a handheld fundus camera that utilizes a handheld intelligent device for image acquisition. The handheld fundus camera images the fundus, transmits fundus images with the handheld intelligent device, and displays and analyzes the fundus images by the handheld intelligent device.

However, since the handheld intelligent device cannot collect the near infrared light source, the handheld fundus cameras generally use L ED light source as the illumination light source, human eyes are sensitive to L ED light source, so that mydriasis is needed when the eye fundus camera is used, and discomfort of a detected person is increased disadvantageously.

Disclosure of Invention

To overcome one or more deficiencies in the prior art, the present invention provides a fundus camera, a fundus camera system, and a method of controlling a fundus camera system.

According to one aspect of the present invention, there is provided an eye fundus camera with an image transfer function for imaging a human eye based on a handheld smart device, comprising: an optical system and a control unit, wherein the optical system is used for generating focusing light required by a focusing process and illumination light required by a photographing process, and comprises: the device comprises a first lighting element, a second beam splitter prism, a light filter, a light homogenizing sheet, an annular diaphragm and a condenser lens, wherein the first lighting element is used for providing lighting light required in the photographing process, the second lighting element is used for providing focusing light required in the focusing process, the light filter is positioned between the second lighting element and the second beam splitter prism and used for filtering a human eye sensitive wave band in the focusing light, the light homogenizing sheet is used for softening the lighting light and the focusing light, the annular diaphragm and the condenser lens are positioned between the light homogenizing sheet and the annular diaphragm and used for imaging the softened lighting light and the focusing light at the annular diaphragm to form an annular light spot, the first polarizer is used for converting the annular light spot into linearly polarized light, the first beam splitter prism is used for reflecting the linearly polarized light, the object eyepiece is used for imaging the linearly polarized light reflected by the first beam splitter prism at the human eye to form an annular light spot image, the imaging objective lens can move and images an eyeground image at infinity, and the second polaroid is used for filtering reflected stray light from a human eye and the eye-connecting objective lens, wherein the eye-connecting objective lens, the first light splitting prism, the imaging objective lens and the second polaroid are sequentially arranged along a first light path formed between the human eye and the handheld intelligent device, the first light splitting prism, the first polaroid, the annular diaphragm, the condenser lens, the light homogenizing plate, the second light splitting prism and the first illuminating element are sequentially arranged along a second light path orthogonal to the first light path, and the second light splitting prism, the light filter and the second illuminating element are sequentially arranged along a third light path parallel to the first light path; wherein the control unit is used for controlling the optical system.

According to another aspect of the present invention, there is provided a fundus camera system including: the fundus camera as described above; and the handheld intelligent device is used for acquiring images of the eyeground, and the control unit is used for controlling the start of photographing of the handheld intelligent device.

According to still another aspect of the present invention, there is provided a control method of a fundus camera system, the fundus camera system being the above-described fundus camera system including the above-described fundus camera and a handheld smart device, comprising the steps of: and controlling the second lighting element to be lightened and controlling the first lighting element not to be lightened, carrying out focusing operation, and if the focusing is successful, controlling the second lighting element to be extinguished and the first lighting element to be lightened, and simultaneously controlling the handheld intelligent device to photograph.

Compared with the prior art, the invention has the following beneficial effects: two light sources are adopted to respectively finish focusing and illumination. In the focusing process, a low-power light source is adopted for focusing illumination, so that the stimulation to human eyes is reduced, and the pupil constriction is reduced or even avoided. When taking a picture, the eyeground is illuminated by the visible light source with instantaneous high power. Specifically, in the process of collecting human eye images, the combination of the halogen lamp, the optical filter and the light homogenizing sheet is adopted, the human eye sensitive wave band of focusing light rays emitted by the halogen lamp is filtered, and the filtered focusing light rays and the filtered illuminating light rays are softened (and/or homogenized), so that the stimulation of the focusing light rays and the illuminating light rays to human eyes is reduced, and the comfort of the eye fundus camera is improved. And after the focusing process is finished, illuminating the eye fundus by using the xenon flash lamp. The handheld intelligent device realizes imaging acquisition of the eye ground while the xenon flash lamp illuminates the eye ground. The use of a handheld smart device improves the portability and popularity of fundus cameras.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 shows a block diagram of each unit of a fundus camera Ca according to a first embodiment of the present invention.

Fig. 2 shows a schematic configuration diagram of the fundus camera Ca according to the first embodiment of the present invention.

Fig. 3 shows a first flowchart of a control method of the fundus camera Ca according to the first embodiment of the present invention.

Fig. 4 shows a second flowchart of the control method of the fundus camera Ca according to the first embodiment of the present invention.

Fig. 5 shows a block diagram of each unit of the fundus camera Ca according to the second embodiment of the present invention.

Fig. 6 shows a block diagram of each unit of the fundus camera Ca according to the third embodiment of the present invention.

Fig. 7 shows a block diagram of each unit of the fundus camera Ca according to the fourth embodiment of the present invention.

Fig. 8 shows a first flowchart of a control method of the fundus camera Ca according to the second to fourth embodiments of the present invention.

Fig. 9 shows a second flowchart of the control method of the fundus camera Ca according to the second to fourth embodiments of the present invention.

Fig. 10 shows a block diagram of each unit of a fundus camera system CaS according to a fifth embodiment of the present invention.

Fig. 11 shows a schematic configuration diagram of a fundus camera system CaS according to a fifth embodiment of the present invention.

Fig. 12 shows a first flowchart of a control method of a fundus camera system CaS according to a fifth embodiment of the present invention.

Fig. 13 shows a second flowchart of a control method of a fundus camera system CaS according to a fifth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

First embodiment >

First, details of the fundus camera Ca according to the first embodiment of the present invention are described with reference to fig. 1 and 2. The fundus camera Ca includes an optical system 100 and a control unit 200. The optical system 100 and the control unit 200 are connected to each other. The control unit 200 is capable of controlling the optical system 100. Further, the fundus camera Ca may further include a determination unit 300 for determining whether the optical system 100 is in proper focus, the determination unit 300 being connected to the optical system 100 and the control unit 200. Further, the fundus camera Ca may further include a driving unit (not shown) for driving movement of the imaging objective lens 12 described later to achieve focusing. Still further, the fundus camera Ca may further include a timing unit (not shown) for timing after the focusing is unsuccessful. The drive unit and the timing unit are both connected to the control unit 200. The driving unit is further connected to an imaging objective lens 12 to drive the bending mirror therein, and the timing unit is further connected to the determining unit 300. The connection mode between the above elements is not limited, and may include wired connection and wireless connection. The units can be integrated into a whole, and can also be integrated into different modules according to requirements. For example, in the present embodiment, the control unit 200 is integrated in the fundus camera Ca. In the fundus camera system CaS described later, the control unit 200 may be integrated in a hand-held smart device in addition to the fundus camera Ca, and is wirelessly connected to each unit in the fundus camera Ca.

The structural details and the imaging process of the optical system 100 are described with particular reference to fig. 2. Note that what is shown by reference numeral "1" in fig. 2 denotes the human eye (or fundus), but it does not belong to the components of the fundus camera Ca. The illustration of the human eye 1 is not limiting, but rather is to better illustrate the relationship of the optical system 100 of the present embodiment to other elements in the environment.

As shown in fig. 2, the optical system 100 includes the following elements: the device comprises an objective lens 2, a first beam splitter prism 3, a first polaroid 4, an annular diaphragm 5, a condenser 6, a dodging sheet 7, a second beam splitter prism 8, a first illuminating element 9, a light filter 10, a second illuminating element 11, an imaging objective lens 12 and a second polaroid 13.

Details of each of the above elements are given below.

The first illuminating element 9 is used to provide illuminating light required during photographing (i.e., light used during photographing). Preferably, a xenon flash lamp is selected as the first illumination element 9. The second illumination element 11 is used to provide the focusing light required during focusing (i.e., the light used during focusing). Preferably, a halogen lamp is selected as the second lighting element 11.

The second beam splitting prism 8 is used to reflect the in-focus light of the second illumination element 11 (e.g., to deflect the in-focus light by 90 degrees), but can pass the illumination light from the first illumination element 9 directly without deflection. Preferably, the first illumination element 9 and the second illumination element 11 are each equidistant from the second beam splitter prism 8.

The optical filter 10 is located between the second illumination element 11 and the second beam splitter prism 8, and is used for filtering a human eye sensitive waveband in the focusing light. Preferably, the filter 10 employs a high-pass filter with a cut-off wavelength of about 600nm, which is capable of filtering out the optical bands to which the human eye is sensitive, while leaving the optical bands to which the human eye is not sensitive.

The light uniformizer 7 is used to soften (and/or uniformize) the illumination light and the focusing light. The light after being filtered (through the optical filter 10) and softened (through the light homogenizing sheet 7) greatly reduces the sensitivity of human eyes to the light source, and effectively avoids the problem of pupil constriction. The condenser lens 6 is located between the dodging sheet 7 and the annular diaphragm 5, and is used for imaging the softened illumination light and the softened focusing light at the annular diaphragm 5 (namely, forming an annular light spot). The first polarizer 4 is used to convert the annular spot into linearly polarized light. The first beam splitter prism 3 is for reflecting (for example, deflecting 90 degrees) linearly polarized light.

The objective eyepiece 2 is arranged between the human eye 1 and the first beam splitter prism 3 and is capable of forming an annular spot image at the human eye 1.

Light reflected from the human eye (i.e., fundus image) is imaged at infinity by the imaging objective lens 12 after passing through the objective eyepiece 2 and the first beam splitter prism 3. The second polarizer 13 is used to filter the reflected stray light from the human eye 1 and the objective lens 2.

Referring also to fig. 2, the optical system 10 includes 3 optical paths, and the above elements are arranged as follows. For example, a first optical path a is formed between the human eye 1 and the second polarizer 13. With the hand-held smart device 600 described later, a first optical path a is formed between the human eye 1 and an image capture unit (e.g., a camera) of the hand-held smart device 600. The objective eyepiece 2, the first beam splitter prism 3, the imaging objective lens 12, and the second polarizing plate 13 are arranged in this order along the first optical path a in the positional relationship shown in fig. 2. The first optical path a is used to emit light reflected from the human eye 1. In the case of a hand-held smart device 600 described later, the first optical path a is used to transmit light reflected from the human eye 1 to the hand-held smart device 600 (camera), thereby enabling the hand-held smart device 600 to capture an image of the human eye 1.

The optical system 100 further comprises a second optical path B orthogonal to the first optical path a. The first light splitting prism 3, the first polarizing plate 4, the annular diaphragm 5, the condenser lens 6, the dodging plate 7, the second light splitting prism 8 and the first lighting element 9 are sequentially arranged along the second light path B.

The optical system 100 further comprises a third optical path C parallel to the first optical path a. Wherein the second beam splitter prism 8, the filter 10 and the second illumination element 11 are arranged in sequence along the third optical path C. In the example shown in fig. 2, the filter 10 and the second illumination element 11 are arranged on the right side of the second beam splitting prism 8. However, the filter 10 and the second illumination element 11 may also be arranged on the left side of the second beam splitting prism 8. This is not limiting.

The focused light rays are emitted from the second illumination element 11, and reach the human eye 1 (via the optical path C, a part of the optical path B, and a part of the optical path a) via the optical filter 10, the second dichroic prism 8, the dodging sheet 7, the condenser lens 6, the annular diaphragm 5, the first polarizing sheet 4, the first dichroic prism 3, and the objective eyepiece 2 in this order. The focusing light emitted by the second lighting element 11 is filtered by the optical filter 10, and only the wavelength band insensitive to human eyes in the light is reserved. The filtered focusing light reaches the light homogenizing sheet 7 after the direction of the focusing light is changed by the reflection of the second beam splitter prism 8. The light homogenizing sheet 7 can uniformly soften focusing light and reduce the stimulation to human eyes. Then, the focused light passes through the condenser 6 and then is imaged at the annular diaphragm 5 to form an annular light spot, and then the focused light passes through the first polarizer 4 and then is converted into linearly polarized light. The linearly polarized light is reflected by the first beam splitter prism 3, changes the direction, then passes through the eye objective lens 2, reaches the human eyes 1 and forms a clear annular light spot image at the pupils of the human eyes 1. The annular light spot image can effectively avoid the reflection of the cornea and reduce the generation of ghost images.

The illumination light is emitted from the first illumination element 9, and reaches the human eye 1 (via the optical path B and a part of the optical path a) via the second beam splitter prism 8, the dodging sheet 7, the condenser lens 6, the annular diaphragm 5, the first polarizing sheet 4, the first beam splitter prism 3, and the object eyepiece 2 in this order.

After the human eye 1 is illuminated, the light reflected by the human eye 1 travels along a first optical path a through the objective eyepiece 2, the first beam splitter prism 3, the imaging objective 12 and the second polarizer 13. Specifically, the fundus 1 is illuminated by the illumination light and then exits through the pupil, passes through the objective lens 2 and the first beam splitter prism 3, and is imaged at infinity through the imaging objective lens 12. The rays of infinity pass through the second polarizer 13 placed orthogonally to the first polarizer 4 and exit. In the fundus camera system CaS having the hand-held smart device 600 described later, rays of light at infinity pass through the second polarizing plate 13 and reach (an image acquisition unit of) the hand-held smart device 600, such as a camera, and are imaged.

The linearly polarized light converted by the first polarizer 4 is reflected inside the eyeball a plurality of times, and the polarization state is changed according to the optical characteristics of the human eye. The light rays finally emerging from the pupil of the human eye 1 can be considered to be in a state of approximately natural light, while the polarization state of stray light generated by reflection of the cornea and the ocular lens 2 backlight hardly changes. Therefore, the second polarizer 13 will filter out the reflected stray light of the cornea and the objective lens 2, and transmit only the light exiting from the fundus. In addition, since the filter 10 does not filter out all visible light bands, the light from the second polarizer 13 can still be collected by the handheld smart device 600. In the focusing process, the relative position of the imaging objective lens 12 and the detected human eye 1 is adjusted until the handheld intelligent device 600 can acquire a clear fundus image, and at this time, the focusing process can be considered to be finished.

The control unit 200 is used to control the optical system 100, and includes a light source driving circuit (not shown). The light source driving circuit is used to supply power to the second lighting element 11 and the first lighting element 9 to drive them on and off. In the case of the handheld smart device 600 described below, the control unit 200 further includes a synchronization triggering circuit (not shown) for synchronously triggering the handheld smart device 600 to take the linked photograph when the first lighting element 9 is turned on.

The determination unit 300 (shown as a dashed square in fig. 1) is used for determining whether focusing is successful. In the case of a handheld smart device 600, which will be described later, the determination unit 300 may be integrated with the handheld smart device 600. Alternatively, the user can manually determine whether focusing was successful by observing the image imaged on the display screen of the handheld smart device 600.

A method of controlling the fundus camera according to the above-described embodiment is described below with reference to fig. 3 and 4.

First, in S101, the control system 200 controls the second illumination element 11 to be lit and controls the first illumination element 9 not to be lit.

Then, in step S102, a focusing operation is performed. Specifically, the relative position between the imaging objective lens 12 (bending mirror) and the human eye 1 to be detected is adjusted. The focusing may be performed manually by the user or automatically by the fundus camera Ca.

In step S103, it is determined whether focusing is successful. If the focusing is successful, the process goes to step S104, otherwise, the whole process is ended. With the determination unit 300, the fundus camera Ca can automatically determine whether focusing is successful. Alternatively, the user determines whether focusing is successful.

In S104, if focusing is successful, the control unit 200 controls the second illumination element 11 to be turned off and the first illumination element 9 to be turned on. The whole process is then ended.

Fig. 4 shows a second flowchart of the control method of the fundus camera Ca according to the first embodiment of the present invention. Only the differences between fig. 4 and fig. 3 will be described, and the same contents as fig. 2 in fig. 3 will be described with reference to fig. 3, and will not be described again. Fig. 4 differs from the method shown in the flowchart of fig. 3 only in the operation after the focusing is unsuccessful (S103, "no"). The method of fig. 3 directly ends the flow after the focusing is unsuccessful, while in the method of fig. 4, the timing is started if the focusing is unsuccessful. If the time during which the focusing is unsuccessful exceeds a predetermined time (e.g., 1 minute, 2 minutes, etc.) (S105, "yes"), it is determined that the focusing has failed, and the entire flow is ended, otherwise, the flow proceeds to S102 to continue focusing.

If it is judged that focusing fails, the user can also check whether the fundus camera Ca is malfunctioning.

Compared with the prior art, the fundus camera provided by the invention adopts two light sources to respectively finish focusing and illumination. In the process of collecting human eye images, the combination of the halogen lamp, the optical filter and the light homogenizing sheet is adopted, the human eye sensitive wave band of focusing light rays emitted by the halogen lamp is filtered, and the filtered focusing light rays and the filtered illuminating light rays are softened (and/or homogenized), so that the stimulation of the focusing light rays and the illuminating light rays to human eyes is reduced, and the comfort of the eye fundus camera is improved. And after the focusing process is finished, illuminating the eye fundus by using the xenon flash lamp. The handheld intelligent device realizes imaging acquisition of the eye ground while the xenon flash lamp illuminates the eye ground. In addition, the fundus camera of the present invention is relatively simple in structure, relatively small in the number of components, easy to carry, and convenient to operate.

Second embodiment >

The details of the fundus camera according to the first embodiment of the present invention are described above. Next, referring to fig. 5, a block diagram of the fundus camera Ca according to the second embodiment of the present invention will be described. The fundus camera Ca includes the optical system 100, the control unit 200, and the display unit 400, and optionally includes the determination unit 300, the drive unit (not shown), and the timing unit (not shown) according to the first embodiment. Since the optical system 100, the control unit 200, and the determination unit 300 of the present embodiment have the same configurations as the optical system 100, the control unit 200, and the determination unit 300 described in the first embodiment, the respective detailed descriptions will be omitted. The present embodiment will describe only the display unit 400.

The display unit 400 is connected to the control unit 200. The display unit 400 can be used to display the state of the fundus camera Ca (e.g., the focusing condition, the working state (e.g., whether or not a malfunction has occurred)), and can display fundus imaging. With the handheld smart device 600 described below, the display unit 400 may be integrated into the handheld smart device 600 or as an element thereof, such as a display screen of a smart phone.

Third embodiment >

Referring to fig. 6, there is shown a block diagram of a fundus camera Ca according to a third embodiment of the present invention. The fundus camera Ca includes the optical system 100, the control unit 200, and the notification unit 500, and optionally includes the determination unit 300, the drive unit (not shown), and the timing unit (not shown) according to the first embodiment. Since the optical system 100, the control unit 200, and the determination unit 300 of the present embodiment have the same configurations as the optical system 100, the control unit 200, and the determination unit 300 described in the first embodiment, the respective detailed descriptions will be omitted. The present embodiment will describe only the notification unit 500.

The notification unit 500 is connected to the control unit 200. The notification unit 500 may be used to issue a notification to the user about the state of the fundus camera Ca, such as an announcement sound (e.g., a buzzer sound) or a bright light (e.g., a green light) in the case where focusing is successful. The notification unit 500 may also emit a notification sound (e.g., a warning sound) or emit a bright light (e.g., a red light) in the case that focusing has not been successful (in the focusing process) or that focusing has failed (e.g., that focusing has not been successful for a predetermined time in the focusing process). With the handheld smart device 600 described below, the notification unit 500 may be integrated into the handheld smart device 600 or as an element thereof, such as a speaker of a smart phone.

Fourth embodiment >

Referring to fig. 7, there is shown a block diagram of a fundus camera Ca according to a fourth embodiment of the present invention. The fundus camera Ca includes the optical system 100 according to the first embodiment, the display unit 400 of the control unit 200 according to the second embodiment, and the notification unit 500 according to the third embodiment, and optionally includes the determination unit 300 according to the first embodiment, a drive unit (not shown), and a timing unit (not shown). The units are described in the above embodiments, and are not described herein again.

A method of controlling the fundus camera Ca according to the second to fourth embodiments is described below with reference to fig. 8 and 9.

Fig. 8 shows a first flowchart of a control method of the fundus camera Ca according to the second to fourth embodiments of the present invention. The method shown in the flowchart of fig. 8 is different from the method shown in fig. 3 in that steps S107 and S108 are added. Only the differences between fig. 8 and fig. 3 will be described, and the same contents as fig. 3 in fig. 8 are described with reference to fig. 3 and will not be described again.

In the method shown in fig. 3, when it is determined that focusing is successful, the process proceeds directly to S104. However, in the method shown in fig. 8, when it is determined that focusing is successful (yes in S103), the process proceeds to step S107. In S107, the display unit displays a screen on which focusing is successful or the notification unit issues a notification of successful focusing, and then proceeds to S104. When it is determined that the focusing has failed (no in S103), the flow proceeds to step S108, and the display unit displays a screen on which the focusing has failed or the notification unit issues a notification of the focusing failure, and then the flow ends.

In fig. 8, S107 and S108, which are indicated by a broken line, are not steps involved in the second to fourth embodiments. For example, if the fundus camera of the second embodiment is employed, the processing concerning the notification unit is not performed. Similarly, if the fundus camera of the third embodiment is used, the processing relating to the display unit is not performed.

Fig. 9 shows a second flowchart of the control method of the fundus camera Ca according to the second to fourth embodiments of the present invention. Only the differences between fig. 9 and fig. 8 are described below, and the same contents in fig. 9 as those in fig. 8 refer to the description of fig. 8, and are not described again here. The method shown in the flowchart of fig. 9 is different from the method shown in fig. 8 only in the operation after the focusing is unsuccessful, that is, step S105 is added. When the time during which focusing is unsuccessful exceeds a predetermined time (S105, yes), the process proceeds to S108, and otherwise, the process returns to S102. .

Fifth embodiment >

Referring to fig. 10 and 11, a block diagram and a schematic configuration of a fundus camera system CaS according to a fifth embodiment of the present invention are shown, respectively. The fundus camera system CaS includes the handheld smart device 600 and the fundus camera Ca according to any of the embodiments described above.

The handheld intelligent device 600 and the fundus camera Ca according to any of the above embodiments are connected in a wired or wireless manner to transmit images and/or other parameters to each other, and the wireless manner includes wifi, bluetooth, etc.

Details of the fundus camera Ca have been described in the first to fourth embodiments, and are not described here again.

With respect to the handheld smart device 600, it is desirable to have an image acquisition unit, such as a camera. It should be noted that the handheld smart device 600 of the present invention is, for example, an electronic photographing device such as a smart phone or a smart tablet, and is not limited herein. In use, a user places the handheld smart device 600 in a position that causes the human eye captured by the image capture unit (not shown) of the handheld smart device 600 to be clearly imaged and have a maximum field of view. The handheld smart device 600 is configured to implement the following functions: during the focusing process (i.e. when the second lighting element 11 emits light), the handheld smart device 600 is configured to receive the light emitted by the second lighting element 11 and reflected by the human eye 1, which can be used to determine whether the handheld smart device 600 is placed at the correct position; when taking a picture, the handheld intelligent device 600 is used to receive the light emitted by the first lighting element 9 and reflected by the human eye 1, which is used to perform synchronous shooting imaging. The captured image is displayed on the handheld smart device 600 or transmitted to the fundus camera for display by a display unit in the fundus camera.

The fundus camera system CaS optionally includes a holder 700 with three-dimensional adjustment capability that adjusts the handheld smart device 600 to a position that can properly receive images based on the position of the image capture unit of different models of handheld smart devices 600.

The structural details of the fundus camera system CaS are described above. Hereinafter, a control method (photographing process) of the fundus camera system CaS is described with reference to fig. 12 and 13.

Fig. 12 shows a first flowchart of a control method of a fundus camera system CaS according to a fifth embodiment of the present invention. Only the differences between fig. 12 and fig. 8 are described below, and the same contents as fig. 8 in fig. 12 are described with reference to fig. 8 and will not be described again. The method shown in the flowchart of fig. 12 differs from the method shown in fig. 8 in steps S103 and S104.

In S103 of fig. 8, the element for determining whether focusing is successful is the determination unit 300 or the user himself. In S103 showing the control method of the fifth embodiment, in addition to the focusing method of S103 of fig. 8, it is also possible to determine whether the focusing is successful by means of the handheld smart device 600. Specifically, the user can determine whether focusing was successful by observing the imaging of the display screen of the handheld smart device 600.

In S104 of fig. 8, only the first lighting element is controlled to be lit while the second lighting element is extinguished. In S104 shown in fig. 12, the handheld smart device 600 is controlled to take a picture while the first lighting element is controlled to be turned on and the second lighting element is controlled to be turned off.

Fig. 13 shows a second flowchart of a control method of a fundus camera system CaS according to a fifth embodiment of the present invention. Only the differences between fig. 12 and fig. 12 will be described below, and the same contents as fig. 12 in fig. 13 will be described with reference to fig. 12, and will not be described again. The method shown in the flowchart of fig. 13 differs from the method shown in fig. 12 only in the operation after the focusing is unsuccessful, which has been described with reference to fig. 9, and is not repeated here.

In one embodiment, in actual use, the second illumination element is illuminated to adjust the camera of the handheld smart device 600 to the correct position. The user can see the screen of the handheld intelligent device 600, and if the object shot by the camera can be clearly imaged and the visual field is the largest, the position is considered to be correct. With the holder 700, the handheld smart device 600 is mounted on the holder 700, and the camera of the handheld smart device 600 is adjusted to the correct position by the three-dimensional adjustment mechanism on the holder 700.

Then, the second lighting element 11 is turned off and the first lighting element 9 is turned on, and the handheld smart device 600 is controlled to take a synchronous photograph.

The first illumination element 9 and the second illumination element 11 are respectively at the same distance from the second beam splitter prism 8, so that the illumination light emitted by the first illumination element 9 can form a clear annular light spot image at the pupil position of the human eye and illuminate the fundus. Similarly, the light reflected from the fundus is collected by the camera of the handheld intelligent device 600 after passing through the ocular objective 2, the first beam splitter prism 3, the imaging objective 12 and the second polarizer 13, so as to obtain a fundus image, and the photographing process is finished.

Compared with the prior art, the fundus camera system provided by the invention adopts two light sources to respectively finish focusing and illumination. In the process of collecting human eye images, the combination of the halogen lamp, the optical filter and the light homogenizing sheet is adopted, the human eye sensitive wave band of focusing light rays emitted by the halogen lamp is filtered, and the filtered focusing light rays and the filtered illuminating light rays are softened (and/or homogenized), so that the stimulation of the focusing light rays and the illuminating light rays to human eyes is reduced, and the comfort of the eye fundus camera is improved. And after the focusing process is finished, illuminating the eye fundus by using the xenon flash lamp. The handheld intelligent device realizes imaging acquisition of the eye ground while the xenon flash lamp illuminates the eye ground. The use of a handheld smart device improves the portability and popularity of fundus cameras. In addition, the fundus camera of the present invention is relatively simple in structure, relatively small in the number of components, easy to carry, and convenient to operate.

The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a take image transmission function's eye ground camera, its is based on handheld intelligent device and images people's eye, its characterized in that includes: an optical system and a control unit are provided,

the optical system is used for generating focusing light rays required by a focusing process and lighting light rays required by a photographing process, and comprises:

a first lighting element for providing lighting light required in the photographing process,

a second illumination element for providing focusing light required during focusing,

a second beam splitting prism for reflecting the in-focus light of the second illumination element,

the optical filter is positioned between the second lighting element and the second beam splitter prism and is used for filtering a human eye sensitive waveband in the focusing light,

a light homogenizing sheet for softening the illumination light and focusing the light,

the light source is a circular diaphragm,

the condenser lens is positioned between the light homogenizing sheet and the annular diaphragm and is used for imaging the softened illumination light and the softened focusing light at the annular diaphragm to form an annular light spot,

a first polarizing plate for converting the annular spot into linearly polarized light,

a first beam splitting prism for reflecting linearly polarized light,

an object eye lens for forming an annular light spot image at a human eye with the linearly polarized light reflected by the first beam splitting prism,

an imaging objective lens which is movable and images a fundus image at infinity,

a second polarizer for filtering reflected stray light from the human eye and the objective lens,

wherein, the object eye lens, the first beam splitter prism, the imaging objective lens and the second polaroid are arranged along a first light path formed between human eyes and the handheld intelligent device in sequence,

wherein the first beam splitter prism, the first polaroid, the annular diaphragm, the condenser lens, the light homogenizing plate, the second beam splitter prism and the first lighting element are sequentially arranged along a second light path which is orthogonal to the first light path,

the second beam splitter prism, the optical filter and the second lighting element are sequentially arranged along a third light path parallel to the first light path;

wherein the control unit is used for controlling the optical system.

2. The fundus camera according to claim 1, wherein the first illumination element is a xenon flash lamp and the second illumination element is a halogen lamp.

3. The fundus camera according to claim 1 or 2, wherein a distance between the first illumination element and the second beam splitter prism is equal to a distance between the second illumination element and the second beam splitter prism.

4. An fundus camera according to claim 1 wherein the filter is a high pass filter with a cut-off wavelength of around 600 nm.

5. An eye fundus camera according to claim 1 or 2 wherein the imaging objective comprises a diopter lens adapted to accommodate different human eye diopters.

6. A fundus camera according to claim 1 wherein the control unit is adapted to control the turning on and off of the first and second illumination elements.

7. A fundus camera according to claim 1 or 6, further comprising:

a display unit for displaying the acquired image of the fundus; or

A notification unit for giving a notification to the user after the fundus camera has achieved correct focusing.

8. A fundus camera system, comprising:

the fundus camera of any of claims 1-7; and

the handheld intelligent device is used for collecting images of the eyeground, and the control unit is used for controlling the start of photographing of the handheld intelligent device.

9. A fundus camera system according to claim 8 further comprising a holder for adjusting the position and attitude of the handheld smart device.

10. A method of controlling a fundus camera system according to any one of claims 8 to 9, comprising a fundus camera according to any one of claims 1 to 7 and a handheld smart device, comprising the steps of:

controlling the second lighting element to be illuminated and controlling the first lighting element not to be illuminated,

and carrying out focusing operation, if the focusing is successful, controlling the second lighting element to be turned off and the first lighting element to be turned on, and simultaneously controlling the handheld intelligent device to take a picture.