Imaging light path device

Abstract

The utility model discloses an imaging light path device, a Placido disc assembly comprises a Placido disc, a reflecting cover and a camera, and the Placido disc comprises a light transmitting ring and a light blocking ring which are sequentially arranged at intervals in the radial direction and are concentrically arranged; the lighting assembly is located between the Placido disc and the reflecting cover, the lighting assembly comprises a first white light source and a first infrared light source, the first white light source and the first infrared light source project light rays towards the reflecting cover, the reflecting cover reflects the light rays emitted by the first white light source and the first infrared light source to the Placido disc, and the first white light source and the first infrared light source can be controlled to be turned on and off independently. According to the imaging light path device provided by the invention, the illumination uniformity of the Placido disc is improved, the detection accuracy is improved, the first white light source and the first infrared light source can illuminate in a switchable manner, multiple eye items can be detected, light source selection is enriched, dazzling is avoided when the first infrared light source is adopted for illumination, and the richness of a shot image is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of eye optical imaging, in particular to an imaging light path device. BACKGROUND

[0002] Eye detection is a detection of the eyes of a subject by medical means and methods, including, for example, vision, fundus, conjunctiva or intraocular pressure, to prevent and control eye diseases caused by overuse or improper use of eyes and protect eye health. The eye detection device is based on the fundus camera system of optical imaging technology. Through the imaging light path, the fundus image is imaged on the camera, so as to obtain the fundus picture.

[0003] The Placido disc for eye detection can perform various eye detection projects, such as slit lamp examination, tear secretion test, tear film break-up time test, ocular surface vital staining test, tear osmotic pressure determination test, lactoferrin content determination test, and tear fern test. The inventor found in the process of realizing the invention that the existing Placido disc has the problem of uneven brightness when detecting the eyes, which affects the accuracy of detection, and the light source of the Placido disc is single, so that various eye detection projects cannot be applied, which reduces the application range of the Placido disc. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide an imaging light path device that increases the uniformity of Placido disc illumination, improves detection accuracy, and increases the eye detection projects of the Placido disc.

[0005] The imaging light path device provided by the technical scheme of the present application includes a Placido disc assembly, a lighting assembly and a camera. The Placido disc assembly includes a Placido disc and a reflector located distally to the Placido disc. In the direction from the distal side to the proximal side, the radius of the Placido disc gradually increases. The Placido disc includes a light-transmitting ring and a light-blocking ring arranged in sequence and spaced apart in the radial direction and arranged concentrically. A peephole is formed in the center of the distal end of the Placido disc.

[0006] The lighting assembly is located between the Placido disc and the reflector. The lighting assembly includes a first white light source and a first infrared light source that project light towards the reflector. The reflector reflects the light emitted by the first white light source and the first infrared light source onto the Placido disc. The first white light source and the first infrared light source are independently controllable.

[0007] The camera is movably arranged distally to the reflector. The lens of the camera faces the peephole.

[0008] Optionally, the imaging light path device comprises a fixation light path, the fixation light path comprising a fixation light source and a beam splitter capable of reflecting light and transmitting light, the fixation light source being located at a distal side of the peephole and offset to one side of an axis of the peephole, the beam splitter being obliquely arranged between the camera and the peephole and used for reflecting light emitted by the fixation light source towards the peephole and for transmitting light emitted from the peephole to the camera.

[0009] Optionally, a plurality of blue light sources are arranged on the light blocking ring close to the side of the peephole.

[0010] Optionally, at least one second white light source is arranged on the at least one light blocking ring, the second white light source being located proximally to the blue light source along an axial direction of the Placido disc, and a distance between the second white light source and a proximal opening of the Placido disc being greater than a distance between the second white light source and the peephole.

[0011] Optionally, at least one second infrared light source is arranged on the at least one light blocking ring, the second infrared light source being located between the proximal opening of the Placido disc and the second white light source along the axial direction of the Placido disc.

[0012] Optionally, the second infrared light source is divided into two groups and symmetrically arranged on two sides in a vertical direction, and any one group of the second infrared light source is located obliquely above the axis of the Placido disc.

[0013] Optionally, at least one third white light source is arranged on the at least one light blocking ring, the third white light source being located between the proximal opening of the Placido disc and the second infrared light source along the axial direction of the Placido disc.

[0014] Optionally, a light supplementing light source is arranged around the peephole.

[0015] Optionally, an imaging objective is arranged between the peephole and the camera, the imaging objective comprising, in sequence and at intervals, a plano-convex lens, a double-concave lens and a double-convex lens along a direction from proximal to distal;

[0016] The proximal surface of the plano-convex lens is a proximally convex curved surface, and the distal surface of the plano-convex lens is a plane;

[0017] The proximal surface and the distal surface of the double-concave lens are both concave curved surfaces, and the curvature of the proximal surface is smaller than the curvature of the distal surface;

[0018] The proximal surface and the distal surface of the double-convex lens are both convex curved surfaces.

[0019] Optionally, the camera further comprises a filter part, the filter part comprising a filter and a filter base for mounting the filter, the filter base being provided with a filter opening, the filter being opposite to the filter opening, and the filter base being positioned in the housing of the camera.

[0020] The above technical scheme has the following beneficial effects:

[0021] The imaging light path device provided by the application has the following beneficial effects: the reflecting cover is arranged at the far side of the Placido disc, the light emitted by the illumination assembly is diffusely reflected to the Placido disc after being received by the reflecting cover, the uniformity of the illumination of the Placido disc is improved, the accuracy of detection is improved, the illumination assembly comprises a first white light source and a first infrared light source, the first white light source and the first infrared light source can be switched to illuminate, not only can multiple eye project detection be performed, but also the light source selection of the user during detection is enriched, when the first infrared light source is used for illumination, the eyes are not dazzling, the richness of the shooting picture is increased, and thus the performance of the product is improved and the application range of the product is expanded. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a structural schematic view of an imaging light path device according to an embodiment of the application.

[0023] Figure 2 FIG. 2 is a longitudinal schematic view of the imaging light path device according to the embodiment of the application.

[0024] Figure 3 FIG. 3 is a longitudinal sectional view of a fixation light path according to the embodiment of the application.

[0025] Figure 4 FIG. 4 is a structural schematic view of a Placido disc according to the embodiment of the application.

[0026] Figure 5 FIG. 5 is a front view of the Placido disc according to the embodiment of the application.

[0027] Figure 6 FIG. 6 is a longitudinal sectional view of an imaging objective according to the embodiment of the application.

[0028] Figure 7 FIG. 7 is a structural schematic view of a camera according to the embodiment of the application.

[0029] Figure 8 FIG. 8 is an exploded view of the camera according to the embodiment of the application.

[0030] REFERENCE NUMERALS

[0031] 1-Placido disc, 10-transillumination ring, 11-opacification ring, 12-viewing hole, 13-blue light source, 14-second white light source, 15-second infrared light source, 16-third white light source, 17-complementary light source, 18-fissure, 19-flap.

[0032] 2-reflecting shield, 20-illumination assembly.

[0033] 3-camera, 30-housing, 300-transillumination hole, 31-photosensitive part, 310-photosensitive chip, 311-circuit board, 32-filtering part, 320-filter, 321-filter base, 322-filter port, 323-filter support, 324-transverse opening, 325-clamping slot, 326-joystick, 327-bent segment.

[0034] 4-fixation light path, 40-fixation light source, 41-beam splitter.

[0035] 5-imaging objective, 50-plano-convex lens, 51-double-concave lens, 52-double-convex lens, 53-lens barrel. DETAILED DESCRIPTION

[0036] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings.

[0037] It is easy to understand that, according to the technical scheme of the present application, a person skilled in the art can replace various structural modes and implementation modes without changing the essential spirit of the present application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical scheme of the present application, and should not be regarded as the whole or as a limitation or restriction of the technical scheme of the present application.

[0038] In this specification, the orientation terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the structure shown in the drawings, and they are relative concepts, so they can change accordingly according to their different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0039] For convenience of description, in the present application, the side of the Placido disc and each component facing the face of the person to be detected when in use is referred to as the proximal side or the proximal end, and the side of the Placido disc and each component facing away from the face of the person to be detected is referred to as the distal side or the distal end. In the present application, each light source can use an LED lamp bead.

[0040] The present application provides an imaging light path device, comprising: a Placido disc assembly, an illumination assembly 20 and a camera 3.

[0041] Please refer to Figure 1and Figure 2 The Placido disk assembly includes a Placido disk 1 and a reflector 2 located on the distal side of the Placido disk 1. The radius of the Placido disk 1 gradually increases along the direction from the distal side to the proximal side. The Placido disk 1 includes a light-transmitting ring 10 and a light-blocking ring 11 arranged concentrically and spaced apart radially. A viewing hole 12 is provided at the center of the distal end of the Placido disk 1.

[0042] The lighting component 20 is located between the Placido disk 1 and the reflector 2. The lighting component 20 includes a first white light source and a first infrared light source that project light toward the reflector 2. The reflector 2 reflects the light emitted by the first white light source and the first infrared light source onto the Placido disk 1. The first white light source and the first infrared light source can be turned on and off relatively independently and controllably.

[0043] The camera 3 is movably positioned on the far side of the reflector 2, with the lens of the camera 3 facing the viewing hole 12.

[0044] like Figure 2 As shown, the Placido disc 1 in this embodiment, also known as the Placido corneal disc, is bowl-shaped or funnel-shaped, with a large radius at the proximal end and a small radius at the distal end. The light-transmitting ring 10 is the light-transmitting part and can be a white ring. The light-blocking ring 11 is the opaque part and can be a black ring. The light-transmitting ring 10 and the light-blocking ring 11 form adjacent concentric black and white rings for projection onto the cornea, and the curvature and shape of the cornea are understood by observing the concentric ring image reflected on the cornea. A flange 19 is provided on the outer edge of the Placido disc 1, which can be used to position the Placido disc 1. The width of the flange 19 can be set to approximately 20 mm. If necessary, mounting holes can be provided along the circumferential direction of the flange 19 for mounting the Placido disc 1 with bolts. The reflector 2 is also bowl-shaped or funnel-shaped, and its edge is connected to the flange 19 to mount the reflector 2 on the distal side of the Placido disc 1.

[0045] In this embodiment, both the first white light source and the first infrared light source are staggered along the circumferential and / or radial directions on the flange 19 by means of screw connection, snap-fit, or bonding. The first white light source and the first infrared light source project light uniformly onto the reflector 2 in a ring-like manner. The first white light source emits visible light with a wavelength range of 400-650nm. The first infrared light source emits infrared light with a wavelength of approximately 810nm.

[0046] If necessary, a metal reflective film can be provided on the near side of the reflector 2, that is, the side facing the Placido disk 1, so as to diffuse the projected light as evenly as possible to the Placido disk 1.

[0047] In addition, the first white light source and the first infrared light source can be respectively provided with a switch, and the controller controls the two switches respectively to individually control the first white light source or the first infrared light source to be turned on or turned off. The controller, the switch and the like electronic devices can be arranged in the cavity between the Placido disc 1 and the reflector 2, or can be arranged outside the Placido disc assembly.

[0048] The camera 3 has an infrared imaging function, is arranged at the far side of the reflector 2, and the lens of the camera 3 faces the peephole 12 and is arranged concentrically. Specifically, a bracket is arranged at the far side of the reflector 2, and the camera 3 is slidably mounted on the bracket and can be adjusted in the far-near direction along the axis of the Placido disc 1 to realize a focusing function.

[0049] The embodiment of the application can photograph the tear meniscus height, the tear film breakup time and the lipid layer and the like. According to actual needs, the first infrared light source is preferably used for illumination, is not dazzling, and more details of a photographed picture are presented. According to actual needs, the first white light source can also be used for illumination to effectively reflect the original color of the photographed content.

[0050] When the photographed item is the tear meniscus height, the illumination assembly 20 can select the first infrared light source and the first white light source.

[0051] When the photographed item is the tear film breakup time, the illumination light source selects the first infrared light source.

[0052] When the photographed item is the lipid layer, the illumination light source selects the first white light source.

[0053] The detection and measurement of the tear meniscus height, the tear film breakup time and the lipid layer belong to the content in the prior art, and will not be described here.

[0054] In summary, the imaging light path device provided by the embodiment of the application has the following advantages. The reflector 2 is arranged at the far side of the Placido disc 1, the light emitted by the illumination assembly 20 is diffusely reflected to the Placido disc 1 after being received by the reflector 2, the uniformity of illumination of the Placido disc 1 is increased, and the detection accuracy is improved. The illumination assembly includes the first white light source and the first infrared light source, the first white light source and the first infrared light source can be switched to illuminate, not only can multiple eye items be detected, but also the light source selection of the user during detection is enriched. In addition, when the first infrared light source is used for illumination, it is not dazzling, and the richness of a photographed picture is increased, so that the performance of the product is improved, and the application range of the product is expanded.

[0055] In one of the optional embodiments, as shown in Figures 2-3As shown, the imaging light path device comprises a fixation light path 4, the fixation light path 4 comprises a fixation light source 40 and a beam splitter 41 capable of reflecting and transmitting light, the fixation light source 40 is located at the far side of the peep hole 12 and is offset on one side of the axis of the peep hole 12, the beam splitter 41 is obliquely arranged between the camera 3 and the peep hole 12 and is used for reflecting the light emitted by the fixation light source 40 to the peep hole 12 and for transmitting the light from the peep hole 12 to the camera 3.

[0056] The fixation light source 40 can adopt a white light source. The fixation light source 40 is offset on one side of the axis of the peep hole 12 to avoid blocking the light from the peep hole 12 to the camera 3. Preferably, the fixation light source 40 is offset on the upper side of the peep hole 12.

[0057] The beam splitter 41 is an optical element, which is coated glass and can reflect and transmit light. The beam splitter 41 is obliquely arranged to reflect the light emitted by the fixation light source 40 to the peep hole 12 and finally into the eye of the subject, thereby providing a clear fixation target to achieve the effect of fixing the eye fixation point. At the same time, the beam splitter 41 is located on the imaging light path of the camera 3, and the light reflected by the eye enters the camera 3 after passing through the peep hole 12 and the beam splitter 41 to form an image.

[0058] In one of the optional embodiments, as shown in Figure 4 and Figure 5 A plurality of blue light sources 13 are arranged on the light blocking ring 11 near the side of the peep hole 12, which are used for shooting the limbal point dyeing.

[0059] The blue light source 13 is a point light source, and preferably a cobalt blue light source. The wavelength of the visible light emitted by the blue light source 13 is about 465 nm. The number of blue light sources 13 can be set as needed, and preferably four, which are evenly arranged on the light blocking ring 11 in the circumferential direction to increase the uniformity of the light.

[0060] The light blocking ring 11 where the blue light source 13 is located is close to the peep hole 12 and is approximately around the peep hole 12. Among them, the straight line distance between the blue light source 13 and the center of the Placido disc 1 is about 17.55 mm, which refers to the straight line distance of the orthographic projection of the Placido disc 1 (the definition of the straight line distance hereinafter is the same as this). The radius of the light blocking ring 11 where the blue light source 13 is located and the distance between the light blocking ring 11 and the peep hole 12 can also be set as needed, as long as it can meet the needs of shooting the limbal point dyeing.

[0061] In one of the optional embodiments, as shown in Figure 4 and Figure 5As shown, at least one second white light source 14 is arranged on at least one of the light blocking rings 11, and in the axial direction of the Placido disc 1, the second white light source 14 is proximal to the blue light source 13, and the distance between the second white light source 14 and the proximal opening of the Placido disc 1 is greater than the distance between the second white light source 14 and the viewing hole 12.

[0062] The second white light source 14 is used to shoot the lid margin opening, and is arranged on the surface of at least one of the light blocking rings 11. The number of the second white light source 14 can be selected as required, and the distance between the second white light source 14 and the center of the Placido disc 1 can be selected to be about 26.39 mm. The position of the light blocking ring 11 where the second white light source 14 is arranged can also be set according to actual needs, as long as the second white light source 14 can shoot the lid margin opening. Preferably, as shown in Figures 4-5 two second white light sources 14 are arranged on two adjacent light blocking rings 11 respectively, and both of the two second white light sources 14 are directly above the axis of the Placido disc 1, so as to increase the imaging effect of the lid margin opening. The distance between the two second white light sources 14 can be selected to be about 8.84 mm, and the distance between the second white light source 14 close to the center of the Placido disc 1 and the Placido disc 1 can be selected to be about 26.39 mm.

[0063] In one of the optional embodiments, as shown in Figures 4-5 at least one second infrared light source 15 is arranged on at least one of the light blocking rings 11, and in the axial direction of the Placido disc 1, the second infrared light source 15 is between the proximal opening of the Placido disc 1 and the second white light source 14.

[0064] The second infrared light source 15 is used to shoot the meibomian glands, and is arranged on the surface of at least one of the light blocking rings 11. The number of the second infrared light source 15 can be selected as required, and the distance between the second infrared light source 15 and the center of the Placido disc 1 can be selected to be about 67.76 mm. The position of the light blocking ring 11 where the second infrared light source 15 is arranged can also be set according to actual needs, as long as the second infrared light source 15 can shoot the meibomian glands. The wavelength of the infrared light emitted by the second infrared light source 15 is about 845 nm.

[0065] In one of the optional embodiments, as shown in Figures 4-5 the second infrared light source 15 is divided into two groups and symmetrically arranged on the two sides in the vertical direction, and any one group of the second infrared light source 15 is located obliquely above the axis of the Placido disc 1, so as to further improve the shooting effect of the meibomian glands.

[0066] In one of the optional embodiments, as shown in Figure 4 andFigure 5 As shown, at least one third white light source 16 is arranged on at least one of the light blocking rings 11, and in the axial direction of the Placido disc 1, the third white light source 16 is between the proximal opening of the Placido disc 1 and the second infrared light source 15.

[0067] The third white light source 16 is used for eye redness analysis shooting, and is arranged on the surface of at least one of the light blocking rings 11. The number of the third white light source 16 can be selected as required, wherein the distance between the third white light source 16 and the center of the Placido disc 1 can be selected to be about 67.76 mm, and the position of the light blocking ring 11 where the third white light source 16 is arranged can also be set according to actual needs, as long as the third white light source 16 can meet the requirements of eye redness analysis shooting.

[0068] Preferably, one third white light source 16 is arranged on each of the two light blocking rings 11 which are spaced apart from each other, and both of the third white light sources 16 are directly below the axis of the Placido disc 1, so as to further improve the shooting effect. The distance between the two third white light sources 16 in the vertical direction can be selected to be about 14.37 mm, and the distance between the third white light source 16 close to the center of the Placido disc 1 and the center of the Placido disc 1 can be selected to be about 67.76 mm. The arrangement of the above-mentioned blue light source 13, second white light source 14, second infrared light source 15 and third white light source 16 in terms of the relative position relationship between the proximal opening and the axis can avoid mutual interference of the light sources.

[0069] In one of the optional embodiments, as shown in Figure 4 and Figure 5 A light supplementing source 17 is arranged around the viewing hole. The light supplementing source 17 preferably adopts a ring-shaped light source, which can be a lamp ring of a soft flat cable arranged in the light blocking ring 11, is close to a linear light source, and is covered with a light homogenizing ring piece on the outside. The light supplementing source 17 plays a role of supplementing light in the inner ring of the Placido disc 1, and preferably adopts a white light source. The distance between the light supplementing source 17 and the center of the Placido disc 1 can be selected to be about 17.75 mm.

[0070] In addition, a slit 18 for detecting cataract is also arranged on the Placido disc 1.

[0071] In addition, a circuit board can be arranged in the cavity between the Placido disc 1 and the reflector 2. The above-mentioned controller is integrated on the circuit board, and the circuit of the above-mentioned light sources is connected to the circuit board, and the opening and closing of the light sources are controlled by the instruction of the software end to realize the switching of different light sources. In one of the optional embodiments, as shown in Figure 3 and Figure 6As shown, an imaging objective lens 5 is arranged between the viewing hole 12 and the camera 3. Along the direction from the near side to the far side, the imaging objective lens 5 includes a plano-convex lens 50, a biconcave lens 51 and a biconvex lens 52 arranged in sequence at intervals.

[0072] The plano-convex lens 50 has a proximal surface that convexes proximally, and a distal surface that is flat. The biconcave lens 51 has both proximal and distal surfaces that are concave, with the curvature of the proximal surface being less than that of the distal surface. The biconvex lens 52 has both proximal and distal surfaces that are convex.

[0073] Specifically, the plano-convex lens 50, the biconcave lens 51, and the biconvex lens 52 are fixed at a preset distance inside the objective lens barrel 53. The barrel 53 is connected to the reflector 2 and is arranged concentrically with the viewing hole 12. The biconcave lens 51 is mainly used to balance the large amount of spherical aberration introduced by the plano-convex lens 50. The curvature difference between the two surfaces of the biconcave lens 51 allows the distal surface to balance not only the spherical aberration introduced by the plano-convex lens 50 but also a portion of the spherical aberration introduced by the distal surface. By controlling the radius of curvature of each refractive surface, various aberrations are reduced, and images with high resolution and high definition can be obtained. The light rays emitted from the viewing hole 12 pass through the initial focusing effect of the plano-convex lens 50 and the biconcave lens 51 in sequence, and are further focused by the biconvex lens 52. This allows external light rays to be focused onto the image plane inside the camera 3 through a shorter distance, achieving high-definition imaging at close object distance.

[0074] In one alternative embodiment, such as Figures 7 to 8 As shown, the camera 3 also includes a filter section 32, which comprises a filter 320 and a filter base 321 for mounting the filter 320. The filter base 321 has a filter opening 322, and the filter 320 is disposed opposite to the filter opening 322. The filter base 321 is positioned within the housing 30 of the camera 3. In this embodiment, the filter 320 only allows light of a specific wavelength to pass through, and can enhance or highlight colors according to the characteristics of the object being photographed. The filter 320 also helps to reduce exposure and avoid overexposure during imaging. The filter base 321 can be installed within the housing 30 by bolt connection or press-fitting.

[0075] Optionally, the camera 3 further includes a photosensitive unit 31, which includes a photosensitive chip 310 and a circuit board 311 connected in a circuit. The photosensitive chip 310 is located in the path of light propagation. Figures 4 to 7As shown, the photosensitive chip 310 in the embodiment of the present application can be used as the image plane 2 to convert the captured light signals into electronic signals and transmit them to the circuit board 311, and the circuit board 311 processes the received electronic signals to support imaging. The photosensitive chip 310 in the embodiment of the present application can be a CCD (Charge-Coupled Device) with the characteristics of high sensitivity and low noise, or the photosensitive chip 310 can also be a CMOS (Complementary Metal-Oxide Semiconductor) with the characteristics of high integration, low power consumption and low cost.

[0076] When the first white light source, the second white light source 14, the third white light source 16 and the supplementary light source 17 are turned on, the 650-800nm band-pass filter 320 is used. When the first infrared light source and the second infrared light source 15 are turned on, the 650-800nm band-pass filter 320 is used. When the light source is the blue light source 13, the LP500 filter 320 (cut-off wavelength less than 500nm wavelength light) is used. When the filter 320 is switched, the original filter 320 can be removed from the light path, and the required filter 320 can be installed.

[0077] Further, the light filtering part 32 can be provided with a light filtering support 323, two light filters 320 arranged in sequence along the vertical direction are arranged on the light filtering support 323, the light filtering base 321 is provided with a clamping groove 325 for sliding of the light filtering support 323 and is provided with a motor and a rocker 326 for controlling movement of the light filtering support 323, so as to control movement of the required light filter 320 to be opposite to the light filtering port 322, and the light filtering port 322 is located in the clamping groove 325, as shown. Figure 8 By switching the 650-800nm band-pass filter 320 and the LP500 filter 320, certain wavelengths of light can be selectively absorbed or reflected, so as to optimize the color, contrast and clarity of the image.

[0078] As shown in Figure 8 The light filtering support 323 is also provided with a horizontal opening 324, and the rocker 326 is provided with a bent section 327, the bent section 327 is limited in the horizontal opening 324, and the rocker 326 drives the light filtering support 323 to slide in the clamping groove 325 to switch the light filter 320 when the rocker 326 is swung under the drive of the motor. In the embodiment of the present application, one end of the rocker 326 is fixedly sleeved on the output shaft of the motor, the motor can be controlled by the controller in the camera 3 to rotate forward or reverse, so as to drive the rocker 326 to rotate clockwise or counterclockwise, push the bent section 327 to slide in the horizontal opening 324 to drive the light filtering support 323 to move up and down, and switch the upper or lower light filter 320 to be opposite to the light filtering port 322.

[0079] According to the need, the above technical solutions can be combined to achieve the best technical effect.

[0080] The above is only the principle and the preferred embodiment of the present application. It should be pointed out that for ordinary skilled in the art, on the basis of the principle of the present application, a number of other variants can also be made, and should be considered as the protection scope of the present application.

Claims

1. An imaging light path arrangement, characterized by The application relates to a Placido disc assembly, which comprises a Placido disc and a light-reflecting cover located distally to the Placido disc, the radius of the Placido disc gradually increases in the direction from the distal side to the proximal side, the Placido disc comprises light-transmitting rings and light-blocking rings arranged in sequence in the radial direction and arranged concentrically, and a peephole is arranged at the distal end of the Placido disc. An illumination assembly is located between the Placido disc and the light-reflecting cover, the illumination assembly comprises a first white light source and a first infrared light source which project light towards the light-reflecting cover, the light-reflecting cover reflects the light emitted by the first white light source and the first infrared light source to the Placido disc, and the first white light source and the first infrared light source are independently controllable. A camera is movably arranged at the distal side of the light-reflecting cover, and the lens of the camera faces the peephole. The application further relates to a fixation light path, which comprises a fixation light source and a beam splitter capable of reflecting and transmitting light, the fixation light source is located at the distal side of the peephole and is offset to one side of the axis of the peephole, and the beam splitter is obliquely arranged between the camera and the peephole and is used for reflecting the light emitted by the fixation light source to the peephole and transmitting the light emitted from the peephole to the camera.

2. The imaging optical train of claim 1, wherein, A plurality of blue light sources are arranged on one of the light-blocking rings close to the peephole.

3. The imaging optical train of claim 1, wherein, At least one second white light source is arranged on at least one of the light-blocking rings, and in the axial direction of the Placido disc, the second white light source is located proximally to the blue light source, and the distance between the second white light source and the proximal opening of the Placido disc is greater than the distance between the second white light source and the peephole.

4. The imaging optical train of claim 3, wherein, At least one second infrared light source is arranged on at least one of the light-blocking rings, and in the axial direction of the Placido disc, the second infrared light source is located between the proximal opening of the Placido disc and the second white light source.

5. The imaging optical train of claim 4, wherein, The second infrared light source is divided into two groups and symmetrically arranged on the two sides in the vertical direction, and any one group of the second infrared light source is located obliquely above the axis of the Placido disc.

6. The imaging optical train of claim 5, wherein, At least one third white light source is arranged on at least one of the light-blocking rings, and in the axial direction of the Placido disc, the third white light source is located between the proximal opening of the Placido disc and the second infrared light source.

7. The imaging optical train of claim 5, wherein, A light supplementing light source is arranged around the peephole.

8. The imaging optical train of claim 1, wherein, An imaging objective is arranged between the peephole and the camera, and in the direction from the proximal side to the distal side, the imaging objective comprises a plano-convex lens, a double-concave lens and a double-convex lens arranged in sequence.

9. The imaging light path arrangement according to any of claims 1-8, characterized in that The proximal surface of the plano-convex lens is a convex surface which protrudes towards the proximal side, and the distal surface of the plano-convex lens is a plane. The proximal surface and the distal surface of the double-concave lens are both concave surfaces, and the curvature of the proximal surface is smaller than that of the distal surface. The proximal surface and the distal surface of the double-convex lens are both convex surfaces. ​ 10. The imaging light path arrangement according to any of claims 1-8, characterized in that The camera is internally provided with a filter part, which comprises a filter and a filter base for mounting the filter, the filter base being provided with a filter opening, and the filter is oppositely arranged with the filter opening, and the filter base is positioned in the shell of the camera.

Images