Fundus imaging receiving device

Abstract

The invention belongs to the technical field of fundus imaging, and discloses a fundus imaging receiving device. The fundus imaging receiving device comprises a shell and a collimating lens, wherein the collimating lens is fixed in the shell and is used for shaping a light beam; the dichroic mirror is used for filtering the shaped light beam, and the first photoelectric detector is used for receiving light reflected by the dichroic mirror; the reflector is fixed in the shell and used for receiving light transmitted by the dichroic mirror, and the second photoelectric detector is used for receiving light reflected by the reflector. Through the arrangement of the dichroic mirror and the reflecting mirror, the dichroic mirror filters out light with a specific wavelength and reflects the light to the first photoelectric detector, the remaining light is transmitted to the reflecting mirror from the dichroic mirror and is reflected to the second photoelectric detector through the reflecting mirror, and the first photoelectric detector and the second photoelectric detector are used for receiving light with different wavelengths respectively. The arrangement mode that an existing motor switches the optical filter is replaced, a motion structure does not need to be arranged, and the overall reliability of the fundus imaging receiving device can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fundus imaging, and in particular to a fundus imaging receiving device. Background Art

[0002] The fundus blood vessels are the only blood vessels in the human body that can be directly observed through the body surface. Changes in the optic nerve, retina and its blood vessels are of great help and guidance for disease diagnosis and treatment. Fundus imaging is a medical technology that uses optical imaging principles to image the eyes.

[0003] In the prior art, fundus imaging receiving devices usually have a single detector as a receiving element and use a motor to switch filters to receive light beams of different wavelengths. Since a motor is used to switch filters, there is a moving structure, resulting in poor overall reliability.

[0004] Therefore, there is an urgent need to provide a fundus imaging receiving device that can receive light beams of different wavelengths without setting up a moving structure, replacing the existing motor-switched filter setting method, and realizing reliable and convenient manufacturing and installation of the receiving device module, thereby improving the overall system reliability. Summary of the Invention

[0005] The purpose of the present invention is to provide a fundus imaging receiving device that can receive light beams of different wavelengths without setting up a moving structure, replacing the existing motor switching filter setting method, thereby improving overall reliability.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The present invention provides a fundus imaging receiving device, which includes a housing, a collimating lens, one or more dichroic mirrors, a reflector, and a first photodetector and a second photodetector fixed to the housing, wherein the first photodetector is one or multiple first photodetectors arranged in series along a light beam; the collimating lens is fixed in the housing for shaping the light beam, the dichroic mirror is fixed in the housing for filtering the shaped light beam, the first photodetector is arranged in a one-to-one correspondence with the dichroic mirror for receiving light reflected from the dichroic mirror; the reflector is fixed in the housing for receiving light transmitted from the dichroic mirror, and the second photodetector is arranged in a one-to-one correspondence with the reflector for receiving light reflected from the reflector.

[0008] As an optional technical solution for a fundus imaging receiving device, two dichroic mirrors are provided, the number of the first photodetectors is equal to the number of the dichroic mirrors, and the dichroic mirrors are both located between the collimating lens and the reflector. Each dichroic mirror is used to filter light of a specific wavelength, and the multiple first photodetectors and the second photodetectors are respectively used to receive and detect light of a specific wavelength.

[0009] As an optional technical solution for a fundus imaging receiving device, the housing includes a base and a cover. The base is provided with a first opening for installing the dichroic mirror and a second opening for installing the reflecting mirror. One end of the cover is a flat plate structure and the other end is an arc-shaped plate structure. The cover is fixed to the base so that the flat plate structure closes the first opening and the arc-shaped plate structure closes the second opening.

[0010] As an optional technical solution for a fundus imaging receiving device, the base has a first mounting structure for supporting the color separation mirror and a second mounting structure for supporting the reflector. The base is also provided with a supporting beam. The first mounting structure and the second mounting structure are respectively located on both sides of the supporting beam. The first mounting structure corresponds to the first opening, and the second mounting structure corresponds to the second opening and is connected to the supporting beam.

[0011] As an optional technical solution of a fundus imaging receiving device, the first photodetector and the second photodetector are any one of an avalanche photodiode, a photodiode, a photomultiplier tube and a multi-pixel photon counter.

[0012] As an optional technical solution for the fundus imaging receiving device, it also includes an optical fiber connector fixed to the housing, the collimating lens is connected to the optical fiber connector, and the optical fiber connector is used to connect the optical fiber to transmit the light beam coupled into the optical fiber to the collimating lens.

[0013] As an optional technical solution of the fundus imaging receiving device, it also includes a first pressing ring, and the collimating lens is fixed to the optical fiber connector through the first pressing ring;

[0014] And / or, it further includes a second pressing ring, and the first photodetector and the second photodetector are respectively fixed to the housing through the second pressing ring.

[0015] As an optional technical solution of the fundus imaging receiving device, the optical fiber connector is provided with a rounded transition area, and the optical fiber connector is in contact with the collimating lens through the rounded transition area.

[0016] As an optional technical solution for a fundus imaging receiving device, the shell is provided with a positioning plane, the optical fiber connector is partially inserted into the shell, and the part of the optical fiber connector inserted into the shell is provided with a side plane, and the side plane is in contact with the positioning plane to limit the relative rotation of the shell and the optical fiber connector.

[0017] As an optional technical solution of the fundus imaging receiving device, the housing is provided with a first mounting groove, and the dichroic mirror is adhered to the wall of the first mounting groove and fixed to the housing by a first fastener;

[0018] And / or, the housing is provided with a second mounting groove, and the reflector is adhered to the wall of the second mounting groove and fixed to the housing via a second fastener.

[0019] Beneficial effects:

[0020] The present invention provides a fundus imaging receiving device, which includes a housing, a collimating lens, one or more dichroic mirrors, a reflector, and a first photodetector and a second photodetector fixed to the housing, wherein the first photodetector is one or more; the collimating lens is fixed in the housing and is used to shape a light beam; the dichroic mirror is fixed in the housing and is used to filter the shaped light beam; the first photodetector is arranged in a one-to-one correspondence with the dichroic mirror, and is used to receive light reflected from the dichroic mirror; the reflector is fixed in the housing and is used to receive light transmitted from the dichroic mirror; the second photodetector is arranged in a one-to-one correspondence with the reflector, and is used to receive light reflected from the reflector. By setting a dichroic mirror and a reflector, the dichroic mirror filters out light of a specific wavelength and reflects it onto the first photodetector. The remaining light is transmitted from the dichroic mirror to the reflector and reflected by the reflector to the second photodetector. The first photodetector and the second photodetector respectively receive light of different wavelengths, thereby replacing the existing motor-switched filter setting method. There is no need to set up a motion structure. The arc-shaped cover and the internal structure layout optimize the internal structure layout, achieve reliable installation and arrangement of the overall structure, and help to improve the overall reliability of the fundus imaging receiving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic structural diagram of a fundus imaging receiving device provided in an embodiment of the present invention;

[0022] Figure 2 is a disassembled diagram of a housing provided by an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of a base provided by an embodiment of the present invention;

[0024] Figure 4 is a cross-sectional view of a base provided by an embodiment of the present invention;

[0025] Figure 5 is a schematic structural diagram of an optical fiber connector provided by an embodiment of the present invention;

[0026] Figure 6 It is a partial structural diagram of the base provided by an embodiment of the present invention.

[0027] In the picture:

[0028] 10. Housing; 11. Base; 11a. First mounting structure; 11b. Second mounting structure; 11c. Support beam; 111. Positioning plane; 112. First mounting slot; 113. Second mounting slot; 114. First opening; 115. Second opening; 116. Light-collecting hole; 117a. First channel; 117b. Second channel; 117c. Third channel; 118a. First boss; 118b. Second boss; 119a. First receiving groove; 119b. Second receiving groove; 119c. Third receiving groove; 12. Cover;

[0029] 21. Collimating lens; 22. Optical fiber connector; 221. Rounded corner transition area; 222. Side plane;

[0030] 31. dichroic mirror; 31a. first dichroic mirror; 31b. second dichroic mirror; 32. first photodetector;

[0031] 41. Reflector; 42. Second photodetector;

[0032] 51. First pressing ring; 52. Second pressing ring;

[0033] 60. Fixed pressure ring; 70. Rubber pad. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0035] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0038] like Figures 1 to 6 As shown, this embodiment provides a fundus imaging receiving device, which includes a housing 10, a collimating lens 21, one or more dichroic mirrors 31, a reflector 41, and a first photodetector 32 and a second photodetector 42 fixed to the housing 10, wherein there are one or more first photodetectors 32; the collimating lens 21 is fixed in the housing 10 for shaping the light beam; the dichroic mirror 31 is fixed in the housing 10 for filtering the shaped light beam, the first photodetector 32 is arranged in a one-to-one correspondence with the dichroic mirror 31, and the first photodetector 32 is used to receive light reflected from the dichroic mirror 31; the reflector 41 is fixed in the housing 10 for receiving light transmitted from the dichroic mirror 31, the second photodetector 42 is arranged in a one-to-one correspondence with the reflector 41, and the second photodetector 42 is used to receive light reflected from the reflector 41.

[0039] By setting up a dichroic mirror 31 and a reflector 41, the dichroic mirror 31 filters out light of a specific wavelength and reflects it onto the first photodetector 32. The remaining light is transmitted from the dichroic mirror 31 to the reflector 41 and reflected by the reflector 41 to the second photodetector 42. The first photodetector 32 and the second photodetector 42 are used to receive light of different wavelengths respectively, replacing the existing motor-switching filter setting method. There is no need to set up a moving structure, which helps to improve the overall reliability of the fundus imaging receiving device.

[0040] Optionally, two dichroic mirrors 31 are provided, and the first photoelectric detector 32 is provided in a number equal to that of the dichroic mirrors 31, and each dichroic mirror 31 is located between the collimating lens 21 and the mirror 41, and each dichroic mirror 31 is used to filter light of a specific wavelength, and the plurality of first photoelectric detectors 32 and the second photoelectric detector 42 are respectively used to receive and detect light of a specific wavelength.

[0041] In the embodiment, two dichroic mirrors 31 are provided at intervals, and correspondingly, two first photoelectric detectors 32 are provided; one mirror 41 is provided, and one second photoelectric detector 42 is provided. In other embodiments, only one dichroic mirror 31 can be provided, and one first photoelectric detector 32 is correspondingly provided.

[0042] Specifically, the two dichroic mirrors 31 are a first dichroic mirror 31a and a second dichroic mirror 31b, the first dichroic mirror 31a is used to reflect red light and transmit blue-green light, and the second dichroic mirror 31b is used to reflect green light and transmit blue light. It can be understood that the models of the two first photoelectric detectors 32 and the second photoelectric detector 42 can be selected according to the wavelengths they receive, and the models can be the same or different; the number and the arrangement position of the first photoelectric detector 32 and the second photoelectric detector 42 can also be adjusted according to actual needs.

[0043] In the embodiment, the first dichroic mirror 31a and the second dichroic mirror 31b are both planar dichroic mirrors; the collimating lens 21 is a single aspheric collimating lens; and the mirror 41 is a dielectric film mirror or a metal film mirror. In other embodiments, the collimating lens 21 can also be a combined mirror group composed of a plurality of lenses.

[0044] Further, the fundus imaging receiving device further comprises a fiber joint 22 fixed to the shell 10, and the collimating lens 21 is connected to the fiber joint 22, and the fiber joint 22 is used to connect an optical fiber to transmit a light beam coupled into the optical fiber to the collimating lens 21. By connecting the collimating lens 21 to the fiber joint 22, and then fixing the fiber joint 22 in the shell 10, the collimating lens 21 is located in the shell 10, which can ensure the relative position of the fiber joint 22 and the collimating lens 21 is accurate, reduce collimation error, improve light energy utilization, and avoid the relative position of the fiber joint 22 and the collimating lens 21 from deviating when repeatedly installing and dismounting the fiber joint 22.

[0045] Optionally, the fundus imaging receiving device further comprises a first compression ring 51, and the collimating lens 21 is fixed to the fiber joint 22 through the first compression ring 51. The collimating lens 21 is fixed to the fiber joint 22 by the first compression ring 51, and the first compression ring 51 applies uniform pressure to the outer periphery of the collimating lens 21, which can effectively prevent the collimating lens 21 from moving, and avoid imaging blur.

[0046] Optionally, the optical fiber connector 22 is provided with a rounded transition zone 221, and the optical fiber connector 22 contacts the collimating lens 21 through the rounded transition zone 221. By providing the rounded transition zone 221 on the optical fiber connector 22 and contacting the collimating lens 21 through the rounded transition zone 221, the rounded transition zone 221 and the collimating lens 21 form a curved contact surface, thereby avoiding stress on the collimating lens 21 caused by the sharp chamfered edge, and effectively protecting the collimating lens 21.

[0047] In this embodiment, a receiving groove is provided at the end of the optical fiber connector 22, and a thread is provided on the inner wall of the receiving groove. The collimating lens 21 is arranged in the receiving groove, and the first pressure ring 51 cooperates with the thread on the inner wall of the receiving groove and presses the collimating lens 21 on the side wall of the receiving groove.

[0048] See also Figure 2 and Figure 3 The housing 10 includes a base 11 and a cover 12. The base 11 is provided with a first opening 114 for mounting the dichroic mirror 31 and a second opening 115 for mounting the reflector 41. The cover 12 has a flat plate structure at one end and a curved plate structure at the other end. The cover 12 is fixed to the base 11 so that the flat plate structure closes the first opening 114 and the curved plate structure closes the second opening 115. By providing the first opening 114 and the second opening 115 on the base 11, the dichroic mirror 31 can be placed into the base 11 through the first opening 114, and the reflector 41 can be placed into the base 11 through the second opening 115. The cover 12 is then installed. The flat plate structure of the cover 12 closes the first opening 114, and the curved plate structure of the cover 12 closes the second opening 115. This provides dust and dirt protection while also blocking interference from stray light from the external environment. The curved cover 12 and the internal structural layout optimize the internal structure, achieving reliable installation and layout of the entire structure.

[0049] In this embodiment, a first boss 118a is provided on the top of the base 11, and a second boss 118b is provided on the side of the base 11 away from the optical fiber connector 22. The cover 12 is placed on the base 11, with one end of the cover 12 resting on the second boss 118b and the other end abutting against the first boss 118a. The provision of the first boss 118a and the second boss 118b helps ensure that the cover 12 is accurately installed.

[0050] Optionally, the fundus imaging receiving device further includes a rubber pad 70, which is sandwiched between the base 11 and the cover 12. The rubber pad 70 at the junction of the base 11 and the cover 12 can block the intrusion of dust and moisture from the environment, ensuring imaging stability. The elasticity of the rubber pad 70 can also provide a buffering effect, reducing external impact or vibration. The rubber pad 70 is annular, and its shape and size match those of the base 11 and the cover 12.

[0051] Specifically, the base 11 includes a first mounting structure 11a for supporting the dichroic mirror 31 and a second mounting structure 11b for supporting the reflector 41. The first mounting structure 11a corresponds to the first opening 114, and the second mounting structure 11b corresponds to the second opening 115. In this embodiment, both the first mounting structure 11a and the second mounting structure 11b have triangular protrusions and recesses. The recess of the first mounting structure 11a communicates with the first opening 114, and the recess of the second mounting structure 11b communicates with the second opening 115.

[0052] In this embodiment, the first mounting structure 11a is located between the optical fiber connector 22 and the second mounting structure 11b, and the second mounting structure 11b is arranged at the corner of the base 11; the overall structural space is optimized, and the installation and maintenance of the dichroic mirror 31 and the reflector 41 are facilitated.

[0053] Optionally, a support beam 11c is further provided within the base 11. The first mounting structure 11a and the second mounting structure 11b are located on either side of the support beam 11c, with the second mounting structure 11b connected to the support beam 11c. The provision of the support beam 11c connected to the second mounting structure 11b facilitates good support, ensuring structural stability and reliability. In this embodiment, the base 11 is a one-piece structure.

[0054] Furthermore, the first mounting structure 11 a is provided with a first mounting groove 112 , and the dichroic mirror 31 is adhered to the groove wall of the first mounting groove 112 and fixed to the first mounting structure 11 a by a first fastener.

[0055] Furthermore, the second mounting structure 11 b is provided with a second mounting groove 113 , and the reflector 41 is adhered to the groove wall of the second mounting groove 113 and fixed to the second mounting structure 11 b by a second fastener.

[0056] By providing a first mounting groove 112 on the first mounting structure 11a and a second mounting groove 113 on the second mounting structure 11b, the dichroic mirror 31 and the reflector 41 are mounted to their respective positions on the base 11 using a combination of adhesive bonding and fasteners. This provides a secure and reliable installation with strong environmental adaptability. In this embodiment, corresponding glue dispensing grooves are provided on the sides of the first and second mounting grooves 112, 113, as well as threaded holes for attaching lens fixtures during glue dispensing and for attaching corresponding fasteners. In other embodiments, springs or other pressure plates may be used to secure the dichroic mirror 31 and the reflector 41.

[0057] In this embodiment, a side tube portion is protruding from the side of the base 11 away from the second mounting structure 11b, and a side mounting port is provided in the side tube portion. The side mounting port is connected to the internal space of the base 11, and the collimating lens 21 and the optical fiber connector 22 are inserted into the side mounting port. The optical fiber connector 22 is fixed to the side tube portion of the base 11 by a fixed pressure ring 60.

[0058] See also Figure 1 、 Figure 5 and Figure 6 To prevent the optical fiber connector 22 from rotating, a positioning flat 111 is provided on the side tube portion of the base 11. The optical fiber connector 22 is partially inserted into the housing 10, and the portion of the optical fiber connector 22 inserted into the base 11 is provided with a side flat 222. The side flat 222 mates with the positioning flat 111 to limit relative rotation between the base 11 and the optical fiber connector 22. By providing the positioning flat 111 and the side flat 222 in a coordinated manner, relative rotation between the base 11 and the optical fiber connector 22 is limited, effectively preventing the imaging effect from being affected by misalignment or tilt of the optical fiber connector 22.

[0059] See also Figure 1 、 Figure 3 and Figure 4 In this embodiment, a first opening 114 is provided at the top of the base 11, and a receiving groove is provided at the bottom of the base 11; three receiving grooves are arranged side by side at intervals, namely a first receiving groove 119a, a second receiving groove 119b, and a third receiving groove 119c. The first receiving groove 119a and the second receiving groove 119b are respectively used to accommodate a first photodetector 32, and the third receiving groove 119c is used to accommodate a second photodetector 42; the first photodetector 32 in the first receiving groove 119a corresponds to the first dichroic mirror 31a, the first photodetector 32 in the second receiving groove 119b corresponds to the second dichroic mirror 31b, and the second photodetector 42 in the third receiving groove 119c corresponds to the reflecting mirror 41.

[0060] The first photodetector 32 and the second photodetector 42 are each any one of an avalanche photodiode (APD), a photodiode (PD), a photomultiplier tube (PMT), and a multi-pixel photon counter (MPPC). By using highly sensitive photosensitive elements such as avalanche photodiodes and photodiodes as receiving devices, they are suitable for detecting weak light signals.

[0061] Optionally, the fundus imaging receiving device further includes a second pressing ring 52, by which the first photodetector 32 and the second photodetector 42 are each secured to the housing 10. The photodetectors are secured to the housing 10 via the pressing rings to ensure accurate mounting of the photodetectors. In this embodiment, the second pressing ring 52 is threadedly connected to the inner wall of the corresponding receiving groove on the base 11. In other embodiments, the second pressing ring 52 may also be configured to engage with the housing 10.

[0062] In this embodiment, the first mounting structure 11a is provided with a first channel 117a and a second channel 117b, and the second mounting structure 11b is provided with a third channel 117c. The first channel 117a has one end opening facing the collimating lens 21, and the other end communicating with the first accommodating groove 119a. The second channel 117b has one end opening facing the first dichroic mirror 31a, and the other end communicating with the second accommodating groove 119b. The third channel 117c has one end opening facing the second dichroic mirror 31b, and the other end communicating with the third accommodating groove 119c. The first channel 117a, the second channel 117b, and the third channel 117c are all L-shaped channels with circular cross-sections.

[0063] Optionally, a focusing hole 116 is further provided in the base 11 , which is connected to the first channel 117 a and corresponds to the position of the collimating lens 21 , so that light emitted from the collimating lens 21 passes through the focusing hole 116 into the first channel 117 a and is emitted into the first dichroic mirror 31 a .

[0064] In this embodiment, the focusing aperture 116 is a tapered aperture, and its inner diameter gradually decreases as it moves away from the collimating lens 21. The first dichroic mirror 31a, the second dichroic mirror 31b, and the reflector 41 are arranged in parallel, and their planes are all inclined at an angle to the horizontal. This tapered aperture structure with a tapered inner diameter effectively constrains the light propagation path, reduces interference from stray light, and ensures that light reaches the first dichroic mirror 31a with high collimation. The coordinated design of the tapered aperture structure with the tilt angles of the dichroic mirrors 31 and reflector 41 prevents cross-interference between the illumination and imaging light paths, ensuring clear imaging.

[0065] Furthermore, the conical hole structure has an end on the side away from the collimating lens 21, and the end has a stepped structure. The stepped structure corresponds to the end of the dichroic mirror 31 to support or position the dichroic mirror 31; similarly, the ends of the inner sides of the first mounting structure and the second mounting structure close to the dichroic mirror 31 or the reflector 41 also have corresponding stepped structures, which cooperate with the corresponding ends of the dichroic mirror 31 or the reflector 41.

[0066] The following is the specific installation and use process of the fundus imaging receiving device:

[0067] The collimating lens 21 is installed in the optical fiber connector 22 and is tightened by the first pressure ring 51. The optical fiber connector 22 is inserted into the base 11 and tightened by the fixed pressure ring 60. The positioning plane 111 of the base 11 cooperates with the side plane 222 of the optical fiber connector 22 to prevent the optical fiber connector 22 and the base 11 from rotating relative to each other when plugging and unplugging the optical fiber. The first dichroic mirror 31a and the second dichroic mirror 31b are respectively fixed in the corresponding first mounting groove 112 on the base 11, and the reflector 41 is fixed in the second mounting groove 113 of the base 11. The first photodetector 32 and the second photodetector 42 are respectively inserted into the corresponding detector mounting grooves in the base 11 and tightened by the second pressure ring 52. The rubber pad 70 is placed on the base 11 and pressed against the rubber pad 70 by the cover 12. Finally, the cover 12 and the rubber pad 70 are fixed to the base 11 using locking screws.

[0068] When the fundus imaging receiving device is in use, the light beam reflected from the fundus is coupled into the optical fiber after passing through a series of lens groups and collimators. The optical fiber is connected to the optical fiber connector 22. The optical fiber connector 22 transmits the light beam coupled into the optical fiber to the collimating lens 21. The collimating lens 21 is used to shape the light beam, that is, the light beam passes through the optical fiber and then passes through the collimating lens 21 to be shaped into a small light beam, thereby obtaining parallel light or convergent light.

[0069] The red light of the shaped light beam enters the first channel 117a after passing through the focusing hole 116, reaches the first dichroic mirror 31a, and is reflected into the first photodetector 32 corresponding to the first dichroic mirror 31a (that is, the first photodetector 32 in the first receiving groove 119a).

[0070] The green light in the shaped light beam enters the first channel 117a after passing through the focusing hole 116 and reaches the first dichroic mirror 31a. After being transmitted through the first dichroic mirror 31a, it enters the second channel 117b and then reaches the second dichroic mirror 31b. It is then reflected into the first photodetector 32 corresponding to the second dichroic mirror 31b (i.e., the first photodetector 32 in the second receiving groove 119b).

[0071] The blue light of the shaped light beam enters the first channel 117a after passing through the focusing hole 116, reaches the first dichroic mirror 31a, transmits through the first dichroic mirror 31a, enters the second channel 117b, then reaches the second dichroic mirror 31b, transmits through the second dichroic mirror 31b, enters the third channel 117c, and then reaches the reflector 41 and is reflected into the second photodetector 42.

[0072] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A fundus imaging receiving device, characterized in that: The invention comprises a housing (10), a collimating lens (21), one or more dichroic mirrors (31), a reflecting mirror (41), and a first photodetector (32) and a second photodetector (42) fixed to the housing (10), wherein the first photodetector (32) is one or more; the collimating lens (21) is fixed in the housing (10) for shaping a light beam; the dichroic mirror (31) is fixed in the housing (10) for filtering the shaped light beam; the first photodetector (32) and the dichroic mirror (31) are arranged in a one-to-one correspondence for receiving light reflected from the dichroic mirror (31); the reflecting mirror (41) is fixed in the housing (10) for receiving light transmitted from the dichroic mirror (31); and the second photodetector (42) and the reflecting mirror (41) are arranged in a one-to-one correspondence for receiving light reflected from the reflecting mirror (41).

2. The fundus imaging receiving device according to claim 1, characterized in that: Two dichroic mirrors (31) are provided, the number of the first photodetectors (32) and the dichroic mirrors (31) is equal, the dichroic mirrors (31) are both located between the collimating lens (21) and the reflecting mirror (41), each dichroic mirror (31) is used to filter light of a specific wavelength, and the plurality of the first photodetectors (32) and the second photodetectors (42) are respectively used to receive and detect light of a specific wavelength.

3. The fundus imaging receiving device according to claim 1, wherein: The housing (10) comprises a base (11) and a cover (12); the base (11) is provided with a first opening (114) for installing the dichroic mirror (31) and a second opening (115) for installing the reflector (41); one end of the cover (12) is a flat plate structure and the other end is an arc-shaped plate structure; the cover (12) is fixed to the base (11) so that the flat plate structure closes the first opening (114) and the arc-shaped plate structure closes the second opening (115).

4. The fundus imaging receiving device according to claim 3, characterized in that: The base (11) comprises a first mounting structure (11a) for carrying the dichroic mirror (31) and a second mounting structure (11b) for carrying the reflector (41). A supporting beam (11c) is further provided in the base (11). The first mounting structure (11a) and the second mounting structure (11b) are respectively located on both sides of the supporting beam (11c). The first mounting structure (11a) corresponds to the first opening (114), and the second mounting structure (11b) corresponds to the second opening (115) and is connected to the supporting beam (11c).

5. The fundus imaging receiving device according to claim 1, characterized in that: The first photodetector (32) and the second photodetector (42) are any one of an avalanche photodiode, a photodiode, a photomultiplier tube, and a multi-pixel photon counter.

6. The fundus imaging receiving device according to claim 1, characterized in that: It also includes an optical fiber connector (22) fixed to the housing (10), the collimating lens (21) is connected to the optical fiber connector (22), and the optical fiber connector (22) is used to connect the optical fiber to transmit the light beam coupled into the optical fiber to the collimating lens (21).

7. The fundus imaging receiving device according to claim 6, characterized in that: It also includes a first pressing ring (51), and the collimating lens (21) is fixed to the optical fiber connector (22) via the first pressing ring (51); And / or, it further includes a second pressing ring (52), and the first photodetector (32) and the second photodetector (42) are respectively fixed to the housing (10) through the second pressing ring (52).

8. The fundus imaging receiving device according to claim 7, characterized in that: The optical fiber connector (22) is provided with a rounded transition area (221), and the optical fiber connector (22) is in contact with the collimating lens (21) via the rounded transition area (221).

9. The fundus imaging receiving device according to claim 6, characterized in that: The housing (10) is provided with a positioning plane (111), the optical fiber connector (22) is partially inserted into the housing (10), and the portion of the optical fiber connector (22) inserted into the housing (10) is provided with a side plane (222), and the side plane (222) is in contact with the positioning plane (111) to limit relative rotation between the housing (10) and the optical fiber connector (22).

10. The fundus imaging receiving device according to any one of claims 1 to 9, characterized in that: The housing (10) is provided with a first mounting groove (112), and the dichroic mirror (31) is bonded to the wall of the first mounting groove (112) and fixed to the housing (10) via a first fastener; And / or, the housing (10) is provided with a second mounting groove (113), and the reflector (41) is bonded to the wall of the second mounting groove (113) and fixed to the housing (10) via a second fastener.

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