Eye detection device

Abstract

The utility model discloses an eye detection device which comprises a projection system which comprises a Placido disc assembly and a lighting assembly, and at least part of the lighting assembly is installed on the Placido disc assembly; the image monitoring system comprises a camera device and an imaging light path assembly; the imaging light path assembly is used for performing imaging processing on an image projected to the eyes by the illumination assembly through the Placido disc assembly, so that the image is shot by the camera device; a light filtering assembly is arranged between the imaging light path assembly and the camera device, the light filtering assembly comprises a light filter supporting frame and a first driving part for driving the light filter supporting frame to rotate, a plurality of light filters are arranged on the light filter supporting frame in the circumferential direction, and the first driving part drives the light filter supporting frame to rotate; and one of the optical filters is driven to move to the front side of a lens of the camera device. According to the utility model, switching of multiple groups of optical filters can be realized, and the switching efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to eye detection technical field, especially in computer aided eye detection device. BACKGROUND

[0002] In recent years, computer aided eye detection device has been widely applied for its systematic, objective and accurate analysis of eye shape. This type of eye detection device usually includes Placido disc projection system, image monitoring system and computer image processing system. Placido disc projection system projects several rings onto corneal surface from center to periphery, so that the whole cornea is within the projection analysis range. The ring image projected on the corneal surface can be observed, monitored and adjusted in real time by real-time image monitoring system, so that the corneal image is in the best state for photography, and then it is stored for analysis by computer image processing system.

[0003] In order to observe the specific color of tissue or lesion, the light entrance side of the camera device of the image monitoring system needs to select different filters. The filter of the existing filter switcher can usually only switch three to four groups of filters, which limits the use range of the detection device, and the switching time of the filter is long, which leads to the problem of long detection time. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides an eye detection device which can realize switching of multiple groups of filters and has high switching efficiency.

[0005] In view of the above technical problems, the utility model provides the following technical scheme:

[0006] An eye detection device comprises a projection system, an image monitoring system and a computer image processing system. The projection system comprises a Placido disc assembly and an illumination assembly, and at least part of the illumination assembly is installed on the Placido disc assembly. The image monitoring system comprises a camera device and an imaging light path assembly. The imaging light path assembly images the image of the illumination assembly projected on the eye through the Placido disc assembly, so that the camera device can take pictures. A filter assembly is arranged between the imaging light path assembly and the camera device. The filter assembly comprises a filter support frame and a first driving part for driving the rotation of the filter support frame. A plurality of filters are arranged on the filter support frame in the circumferential direction. The first driving part drives the rotation of the filter support frame, so that one of the filters moves to the front side of the lens of the camera device.

[0007] In some embodiments of the utility model, the filter support frame is configured to have a central region and an extension arm extending radially from the central region. The filter is installed at the end of the extension arm of the filter support frame.

[0008] In some embodiments of the utility model, the first driving part is a rotary motor, and an output shaft of the rotary motor is connected to a central region of the filter support frame.

[0009] In some embodiments of the utility model, the Placido disc assembly comprises a Placido disc and a reflector located on one side of the Placido disc, and at least part of the illumination assembly is located between the Placido disc and the reflector.

[0010] In some embodiments of the utility model, the imaging light path assembly comprises a fixation light path, the fixation light path comprises a fixation light source and a tilting arranged beam splitter, a central part of the Placido disc is provided with a peeping hole, and light emitted by the fixation light source is projected on the eye part through the peeping hole after being reflected by the beam splitter.

[0011] In some embodiments of the utility model, the imaging light path assembly further comprises an imaging objective lens group, the imaging objective lens group comprises a plano-convex lens, a double-concave lens and a double-convex lens which are sequentially and spacedly arranged along a central axis direction of the Placido disc, wherein a side surface of the plano-convex lens facing the Placido disc is an outer convex surface, one side of the plano-convex lens facing the double-concave lens is a plane, a curvature of one side of the double-concave lens facing the plano-convex lens is smaller than a curvature of one side of the double-concave lens facing the double-convex lens, and curvatures of the two outer convex surfaces of the double-convex lens are equal.

[0012] In some embodiments of the utility model, the imaging objective lens group is located on a side of the beam splitter away from the Placido disc, and light projected on the eye part converges to an image plane after passing through the beam splitter and the imaging objective lens group.

[0013] In some embodiments of the utility model, the illumination assembly comprises a slit illumination assembly, the slit illumination assembly comprises a first light path and a second light path which are symmetrically arranged on the installation support, the first light path comprises a first light source and a first optical lens group, the second light path comprises a second light source and a second optical lens group, the first light source is a white light source, the second light source is an infrared light source, a slit light transmission structure is arranged on the first light path and the second light path respectively, light emitted by the first light source is projected on the reflector through the first light path, light emitted by the second light source is projected on the reflector through the second light path, and the reflector reflects the light to the Placido disc.

[0014] In some embodiments of the utility model, the slit light transmission structure comprises a fixed support provided with a light transmission hole, a first sliding seat and a second sliding seat slidingly connected to one side of the fixed support, and a second driving part driving the first sliding seat and the second sliding seat to move in a direction away from or close to each other.

[0015] In some embodiments of the utility model, the second driving part comprises a driving motor, a driving seat connected to an output shaft of the driving motor and moving in a vertical direction, and a first connecting rod and a second connecting rod pivotally connected to the driving seat, one end of the first connecting rod is pivotally connected to the first sliding seat, and one end of the second connecting rod is pivotally connected to the second sliding seat.

[0016] The technical scheme of the utility model has the following technical effects relative to the prior art:

[0017] In the eye detection device, the imaging light path assembly and the camera device are provided with the light filtering assembly, the light filtering piece in the light filtering assembly is arranged on the light filtering piece support in the circumferential direction, the size of the light filtering piece support can be selected according to the size and the number of the light filtering piece, different light filtering pieces can be replaced by driving the light filtering piece support to rotate through the first driving part, and the light filtering piece switching efficiency is high.

[0018] Further, in the eye detection device, the imaging objective lens in the imaging light path assembly comprises a plano-convex lens, a double-concave lens and a double-convex lens arranged in sequence and at intervals, the curvature of the double-concave lens towards the plano-convex lens is smaller than the curvature of the double-concave lens towards the double-convex lens, the curvature of the surface on the side away from the plano-convex lens can balance part of the spherical aberration introduced by the surface on the side away from the plano-convex lens in addition to balancing the spherical aberration introduced by the plano-convex lens. By controlling the curvature radius of each refractive surface, various aberrations are reduced, and an image with high resolution and high definition can be obtained.

[0019] Further, in the eye detection device, the illumination assembly comprises a slit illumination assembly for detecting cataract, and the two sliding seats for adjusting the slit width in the slit light transmission structure of the slit illumination assembly are located outside the fixed support, so that the installation and fixation are facilitated. The moving range of the sliding seat is large, the position precision can be controlled, and continuous stepless adjustment of the slit width can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0020] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, which will help to understand the purpose and advantages of the utility model, and the drawings are as follows:

[0021] Figure 1 It is a structural schematic view of a specific embodiment of the eye detection device of the utility model;

[0022] Figure 2 FIG. 2 is a structural schematic view of a Placido disc assembly and an image monitoring system in the eye detection device of the present application;

[0023] Figure 3 FIG. 3 is a sectional view of the Placido disc assembly and the image monitoring system in the eye detection device of the present application;

[0024] Figure 4 FIG. 4 is a sectional view of an imaging light path assembly in the eye detection device of the present application;

[0025] Figure 5 FIG. 5 is a top view of a functional component mounted on a mounting bracket in a specific embodiment of the eye detection device of the present application;

[0026] Figure 6 FIG. 6 is a structural schematic view of a slit light transmission structure in a specific embodiment of the eye detection device of the present application;

[0027] Figure 7 FIG. 7 is a schematic view of an illumination assembly mounted on a Placido disc in the eye detection device of the present application. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] As Figure 1 shown is one specific embodiment of the eye detection device provided by the utility model, which comprises a projection system for projecting light rays with set requirements to the eye according to different eye diseases, an image monitoring system for imaging and real-time observation and monitoring of the light rays reflected by the eye and taking a photo when the eye image is in the best state, and the image monitoring system stores the image so that a computer image processing system analyzes the image.

[0033] The composition structure and working principle of the projection system and the image monitoring system are described in detail below.

[0034] <Projection system>

[0035] As Figures 1-3 shown, the projection system comprises a Placido disc assembly 10 and an illumination assembly 20, wherein at least part of the light sources of the illumination assembly 20 are installed on the Placido disc assembly 10 for projection on the eye and / or light supplement. Optionally, part of the light sources of the illumination assembly 20 can also be located outside the Placido disc assembly 10 to project on the eye through the optical lens composed light path and the Placido disc assembly 10.

[0036] For the convenience of description, in the utility model, the side of the Placido disc and each component facing the face / eye of the person to be detected when in use is called the proximal side or the proximal end, and the side of the Placido disc and each component facing away from the face / eye of the person to be detected is called the distal side or the distal end. In the utility model, each light source can adopt an LED lamp bead.

[0037] Among them, as Figure 2 , Figure 3 shown, the Placido disc assembly 10 comprises a Placido disc 11 and a reflector 12 located at the distal side of the Placido disc 11, the radius of the Placido disc 11 gradually increases in the direction from the distal side to the proximal side, and a peephole 112 is formed at the center of the distal end of the Placido disc 11. Part of the light sources 260 of the illumination assembly 20 are located between the Placido disc 11 and the reflector 12. The camera 40 is arranged at the distal side of the Placido disc assembly 10, and the light path thereof passes through the peephole 112.

[0038] The Placido disc 11, also known as Placido's corneal disc, is a bowl-shaped disc with light-transmitting and non-light-transmitting annular rings arranged in a radial direction and concentrically. The light-transmitting annular rings are made of light-transmitting material and are light-transmitting parts, such as white annular rings. The non-light-transmitting annular rings can be made of non-light-transmitting material or can be coated or plated with non-light-transmitting paint on the surface of the light-transmitting material, which are non-light-transmitting parts, such as black annular rings. The light-transmitting annular rings and the non-light-transmitting annular rings form adjacent black and white concentric rings, and the several annular rings are uniformly projected onto the corneal surface from the center to the periphery, so that the entire cornea is within the projection analysis range. The outer edge of the Placido disc 11 is provided with a flange 111 outwardly, as shown in Figure 3 The flange 111 can be used to position the Placido disc 11, and specifically, the flange 111 is provided with mounting holes in the circumferential direction for bolt mounting the Placido disc 11. The light shield 12 is configured as a bowl-shaped disc protruding in the same direction as the Placido disc 11, and is mounted by being buckled on the flange 111.

[0039] In one embodiment, the light source 260 includes white light sources and infrared light sources arranged at intervals. The light shield 12 reflects the light emitted by the white light sources and the infrared light sources onto the Placido disc 11, and the white light sources and the infrared light sources are relatively independent and can be controlled to turn on and off respectively. The controller, switch and other electronic devices for controlling the switches of the white light sources and the infrared light sources can be arranged in the cavity between the Placido disc 11 and the light shield 12, or can be arranged outside the Placido disc assembly 10.

[0040] The white light sources and the infrared light sources can be distributed on the flange 111 in a staggered manner along the circumferential direction and / or the radial direction by screw connection, clamping, bonding or the like, and the white light sources and the infrared light sources uniformly project light to the light shield 12 in an annular manner. The white light source emits visible light with a wavelength range of 400-650 nm. The infrared light source emits infrared light with a wavelength of about 810 nm.

[0041] If necessary, a metal reflective film can be arranged on the proximal side of the light shield 12, that is, the side facing the Placido disc 11, to uniformly diffuse the projected light to the Placido disc 11 as much as possible.

[0042] The camera of the camera device 40 has an infrared imaging function and is arranged on the distal side of the light shield 12, and the lens of the camera faces the peephole 112 and is arranged concentrically. Specifically, a bracket is arranged on the distal side of the light shield 12, and the camera device 40 is slidably mounted on the bracket and can be adjusted in the proximal-distal direction along the axis of the Placido disc 11 to realize the focusing function.

[0043] The embodiment of the present application can capture tear river height, tear film break-up time and lipid layer, etc. According to actual needs, preferably, an infrared light source is used for illumination, which is not dazzling and can present more details in the captured image. According to actual needs, a white light source can also be used for illumination, which can effectively reflect the original color of the captured content.

[0044] In the embodiment of the present application, the infrared light source and the white light source are arranged on the distal side of the turn-up 111, which projects light to the Placido disc 11 through the reflector 12 and then transmits the light to the proximal side through the plurality of light-transmitting annular rings. The combination of the infrared light source and the white light source can switchably illuminate, which not only can perform multiple eye project detection, but also enriches the light source selection when the user performs detection, and when the infrared light source is used for illumination, it is not dazzling and increases the richness of the captured image, thereby improving the performance of the product and expanding the application range of the product.

[0045] In an optional embodiment, the illumination assembly 20 includes a slit illumination assembly for detecting cataracts, which is arranged on the distal side of the Placido disc assembly 10. The slit illumination assembly includes a first light path and a second light path arranged symmetrically on the mounting bracket 30, specifically, as shown in Figure 5 , the mounting bracket 30 has a symmetric center line, and the first light path and the second light path are symmetrically arranged on both sides of the symmetric center line of the mounting bracket 30, as shown in Figure 1 , the first light path includes a first light source 21 and a first optical lens group 23, and the second light path includes a second light source 22 and a second optical lens group 24, the first light source 21 is a white light source, the second light source 22 is an infrared light source, and a slit light transmission structure 25 is arranged on the first light path and the second light path respectively, which can form a light knife, and after the light knife irradiates an object, a series of “optical sections” can be formed to clearly observe each part of the object.

[0046] As shown in Figure 7 , two slit light transmission holes 113 are arranged on the reflector 12 and the Placido disc 11 respectively, and the two slit light transmission holes 113 correspond one-to-one with the light paths of the first light source 21 and the second light source 22, which are used for the light emitted by the first light source 21 and the second light source 22 to respectively transmit through the corresponding slit light transmission holes 113 to irradiate the eyes of the subject.

[0047] The two slit light transmission holes 113 are symmetrically arranged on the left and right sides of the viewing hole 112. The slit light transmission hole 113 is a waist-shaped hole, which is long and narrow, which is beneficial to the transmission of slit light. The slit light transmission hole 113 can be arranged on the light-transmitting annular ring or the non-light-transmitting annular ring. The distance between the two slit light transmission holes 113 can be selected according to needs, as long as it can meet the needs of detecting cataracts.

[0048] Specifically, the first light source 21 is a white light source with a color temperature of 80K, and the second light source 22 is an infrared light source with a center wavelength of 850nm. During the examination, the infrared light source in the second optical path can be used, or preferably used, for focusing and examination. Since the human eye is not sensitive to 850nm infrared light, even if the focusing time is long, it will not cause discomfort to the human eye, avoid pupil constriction, and facilitate observation of the internal condition of the eye, greatly improving the user experience. In some cases, such as when it is necessary to take color images of the fundus or lens to see lesions more clearly, the white light source is used for examination, which complements the aforementioned infrared light source examination and expands the scope of application.

[0049] Because the slit illumination assembly uses a dual-light source symmetrical optical path, during inspection, the second light source 22 (infrared light source) can be used for focusing first. When the camera is clearly focused using the infrared light source, even if the inspection is switched to the first light source 21 (white light source), the symmetrical optical path design reduces the hassle of refocusing or the time required for focusing, significantly reducing the time of strong visible light entering the eye, thereby improving user comfort.

[0050] In one embodiment, the first optical lens group 23 and the second optical lens group 24 are composed of identical and symmetrically distributed lenses, and the light rays passing through the first optical lens group 23 and the light rays passing through the second optical lens group 24 have an angle of non-zero degrees relative to the center line of symmetry. Figure 1 , Figure 5 As shown, along the optical path, it includes: collimating lens 231 / 241, first reflecting mirror 232 / 242, first projection lens 233 / 233, second reflecting mirror 234 / 244, and second projection lens 235 / 245.

[0051] Collimating lenses 231 / 241 transform the light from each point of the first light source 21 / second light source 22 into a parallel collimated beam, ensuring the parallelism of the beam. The beam is reflected by the first reflecting mirror 232 / 242 to the side of the first projection lens 233 / 233. The first projection lens 233 / 233 then focuses the light and projects it onto the second reflecting mirror 234 / 244. After being reflected by the second reflecting mirror 234 / 244, the light passes through the second projection lens 235 / 245, which then focuses the light and projects it onto the object being examined (i.e., the human eye), forming a bright and focused beam for better observation of the eye's condition.

[0052] Specifically, in order to ensure the imaging quality of the slit light source, the slit light transmission structure 25 is arranged between the first mirror 232 / 242 and the first projection lens 233 / 233, the slit light transmission structure 25 is a slit light transmission structure with continuously adjustable slit width, for example, the slit width is adjusted between 0-14mm, and the light reflected by the first mirror 232 / 242 passes through the slit light transmission structure 25 to the side of the first projection lens 233 / 233. In the diffuse light projection method, the slit light width is large, which is used for observing the anterior segment of the eye, including the bulbar conjunctiva, the sclera, the iris, the lid margin and the lid conjunctiva of the ectropion, etc.; in the direct projection method, the slit light width is small, which is used for observing the corneal curvature, the corneal thickness, the corneal scar and the contact lens deposit.

[0053] Specifically, in an optional embodiment, as shown in Figure 6 The slit light transmission structure 25 includes a fixed support 251 provided with a light transmission hole, and a first sliding seat 252 and a second sliding seat 253 slidingly connected to one side of the fixed support 251, the first sliding seat 252 and the second sliding seat 253 are synchronously moved away from or close to each other under the action of a second driving part 254 to change the size of the light transmission area. The first sliding seat 252 and the second sliding seat 253 are located outside the fixed support 251, which is convenient for installation and fixation, and the moving range of the first sliding seat 252 and the second sliding seat 253 is large, which is convenient for controlling the position accuracy.

[0054] More specifically, the fixed support 251 is provided with a sliding rail 255 extending in the horizontal direction, and the first sliding seat 252 and the second sliding seat 253 slide along the sliding rail 255 under the driving action of the second driving part 254. More specifically, the sliding rail 255 is configured in the form of a sliding shaft, and the upper and lower sides of the first sliding seat 252 and the second sliding seat 253 are respectively slidingly connected to the sliding rail 255 through sliding bushings, and the sliding bushings are interference-connected in the mounting holes of the first sliding seat 252 and the second sliding seat 253.

[0055] Specifically, in an optional embodiment, the second driving part 254 includes a driving motor, a driving seat 256 connected to the output shaft of the driving motor and moving in the vertical direction, and a first connecting rod 257 and a second connecting rod 258 pivotally connected to the driving seat 256, the other end of the first connecting rod 257 is pivotally connected to the first sliding seat 252, and the other end of the second connecting rod 258 is pivotally connected to the second sliding seat 253. The driving motor drives the driving seat 256 to move in the vertical direction, and the first connecting rod 257 and the second connecting rod 258 drive the first sliding seat 252 and the second sliding seat 253 to synchronously slide along the first sliding rail 255 to realize the mutual approach or separation of the first sliding seat 252 and the second sliding seat 253.

[0056] As shown in Figure 1 The mounting bracket 30 includes a first mounting plate 31 arranged in a substantially horizontal direction and a support structure for supporting the first mounting plate 31. The first mounting plate 31 is shaped as a substantially isosceles trapezoid structure. The first optical lens group 23, the second optical lens group 24, and the slit light transmission structure 25 are mounted on the upper side of the first mounting plate 31. The first optical lens group 23 and the second optical lens group are arranged along the waist line of the first mounting plate 31 in sequence. The collimating lens 231 / 241 of the first optical lens group 23 and the second optical lens group is mounted on the short side of the first mounting plate 31. The second projection lens 235 / 245 of the first optical lens group 23 and the second optical lens group is mounted on the long side of the first mounting plate 31. The first light source 21 and the second light source 22 are mounted on the second mounting plate 32 arranged below the first mounting plate 31 and spaced apart from the first mounting plate 31.

[0057] In an optional embodiment, as shown in Figure 7 A plurality of blue light sources 261 are arranged on the light-tight circular ring close to the peephole 112, which are used for taking the corneal fluorescein staining. The cobalt blue light source can be turned on to take the corneal fluorescein staining.

[0058] The blue light source 261 is preferably a cobalt blue light source.

[0059] The wavelength of the visible light emitted by the blue light source 261 is about 465 nm. The number of blue light sources 261 can be set as needed, and is preferably four. The four blue light sources 261 are arranged uniformly in the circumferential direction on the light-tight circular ring to increase the uniformity of the light.

[0060] The light-tight circular ring where the blue light source 261 is located is close to the peephole 112 and is substantially around the peephole 112. The radius of the light-tight circular ring where the blue light source 261 is located and the distance between the light-tight circular ring and the peephole 112 can be set as needed, as long as the need for taking the corneal fluorescein staining can be met.

[0061] The straight-line distance between the blue light source 261 and the center of the Placido disc 11 is a first length. The first length is the straight-line distance between the blue light source 261 and the axis of the Placido disc 11. The first length can be selected to be about 17.55 mm. In an optional embodiment, as shown in Figure 7 The light-tight circular ring of the Placido disc 11 is provided with at least one third light source 262. The third light source 262 is used for taking the lid margin opening.

[0062] Along the axial direction of the Placido disk 11, the third light source 262 is located near the blue light source 261, and the distance between the third light source 262 and the proximal opening of the Placido disk 11 is greater than the distance between the third light source 262 and the viewing hole 112.

[0063] The number of third light sources 262 can be selected as needed, and the position of the third light source 262 on the opaque ring can be set according to actual needs, as long as the third light source 262 can capture the eyelid opening.

[0064] The third light source 262 is a white light source and a point light source, emitting visible light with a wavelength of 400-6nm. The straight-line distance between the third light source 262 and the axis of the Placido disk 11 is the second length, which can be selected to be approximately 26.39mm.

[0065] Preferably, such as Figure 7 As shown, a third light source 262 is provided on each of the two adjacent opaque rings. Both third light sources 262 are located directly above the axis of the Placido disk 11. The two third light sources 262 are arranged vertically to enhance the imaging effect of the eyelid opening. The straight-line distance between the two third light sources 262 can be selected to be about 8.84 mm. The second length between the third light source 262 near the center of the Placido disk 11 or the third light source 262 on the inner side and the Placido disk 11 can be selected to be about 26.39 mm.

[0066] In one alternative implementation, such as Figure 7 As shown, a fourth light source 263 is provided on at least one opaque ring of the Placido disk 11. Along the axial direction of the Placido disk 11, the fourth light source 263 is located between the proximal opening of the Placido disk 11 and the third light source 262.

[0067] The fourth light source 263 is an infrared light source, and it is a point light source. The fourth light source 263 is used to image the meibomian glands, and it is located on the surface of at least one opaque circular ring. Turning on the fourth light source 263 allows for the imaging of the meibomian glands; the fourth light source 263 emits infrared light with a wavelength of 845 nm.

[0068] The number of fourth light sources 2635 can be selected as needed. The position of the opaque ring containing the fourth light source 263 can be set according to actual needs, as long as the fourth light source 263 can capture images of the meibomian glands. The distance between the fourth light source 263 and the axis of the Placido disk 11 is the third length, which can be selected to be approximately 67.76 mm.

[0069] In one alternative embodiment, such asFigure 7 As shown, the fourth light source 263 is divided into two groups and symmetrically arranged on both sides of the vertical direction, and any group of the fourth light source 263 is located obliquely above the axis of the Placido disc 11, so as to further improve the shooting effect of the Meibomian gland.

[0070] As shown, Figure 7 Any group includes three fourth light sources 263, and the linear distance between any two adjacent fourth light sources 263 in each group can be set to be between 6mm and 7mm, so as to achieve a better Meibomian gland shooting effect.

[0071] In an alternative embodiment, as shown, Figure 7 The fifth light source 264 is arranged on at least one circle of the opaque ring, and the fifth light source 264 is located between the proximal opening of the Placido disc 11 and the fourth light source 263 along the axis of the Placido disc 11.

[0072] The fifth light source 264 is a white light point source, and the linear distance between the fifth light source 264 and the axis of the Placido disc 11 is a fourth length, which can be selected to be about 67.76mm.

[0073] The fifth light source 264 is used for ocular redness analysis shooting, and is arranged on the surface of at least one circle of the opaque ring. The number of the fifth light source 264 can be selected as needed, and the position of the opaque ring where the fifth light source 264 is located can be set according to actual needs, as long as the fifth light source 264 can meet the needs of ocular redness analysis shooting.

[0074] Preferably, one fifth light source 264 is arranged on each of two circles of the opaque ring which are spaced apart from each other, and both of the fifth light sources 264 are located directly below the axis of the Placido disc 11, so as to further improve the shooting effect. The distance between the two fifth light sources 264 along the vertical direction can be selected to be about 14.37mm, and the distance between the fifth light source 264 close to the center of the Placido disc 11 and the axis of the Placido disc 11 can be selected to be about 67.76mm.

[0075] The arrangement of the relative positions of the above-mentioned light sources and the proximal opening of the Placido disc 11 and the axis of the Placido disc 11 can avoid mutual interference of the light sources.

[0076] In an alternative embodiment, as shown, Figure 2-4 The sixth light source 265 is arranged around the viewing hole 112. The sixth light source 265 plays a role of supplementing light around the viewing hole 112.

[0077] The sixth light source 265 is a white light source that emits visible light with a wavelength of 400-650nm. The sixth light source 265 is preferably a ring light source.

[0078] The sixth light source 265 can be a ring of flexible ribbon cables located inside an opaque circular ring, close to a linear light source, and covered with a light-diffusing ring plate on the outside. The sixth light source 265 is used to supplement the inner ring of the Placido disk 11.

[0079] The straight-line distance between the sixth light source 265 and the axis of the Placido disk 11 is the fifth length, which can be selected to be around 17.75mm.

[0080] <Image Monitoring System>

[0081] like Figure 2 As shown, the image monitoring system includes a camera device 40 and an imaging optical path assembly 50. The camera device 40 is located on the distal side of the Placido disk assembly 10. The imaging optical path assembly 50 is located on the distal side of the Placido disk assembly 10 and is aligned with the viewing hole 112.

[0082] The imaging optical path assembly 50 transmits the reflected image of the eye to the camera device 40, so that the camera device 40 can capture an image of the eye.

[0083] After the light source of the illumination component 20 is lit, it is projected or transmitted to the eye through the Placido disk component 10. The reflection from the eye passes through the viewing hole 112 and is then transmitted to the imaging device 40 (camera) via the imaging optical path component 50 for processing. A filter component 60 is provided between the imaging optical path component 50 and the imaging device 40, such as... Figure 1 As shown, the filter assembly 60 includes a filter support frame 61 and a first driving unit 62 that drives its rotation. A plurality of filters 63 are arranged circumferentially on the filter support frame 61. The first driving unit 62 drives the filter support frame 61 to rotate, thereby moving one of the filters 63 to the front of the lens of the imaging device 40. Different filters 63 only allow light of specific wavelengths to pass through, which can enhance or highlight colors according to the characteristics of the object being photographed, improving the imaging effect of the imaging device 40. At the same time, the filters 63 also help reduce exposure and avoid overexposure problems during imaging.

[0084] In the above-mentioned filter assembly 60 of this application, the filter 63 is arranged circumferentially on the filter support frame 61. The size of the filter support frame 61 can be selected according to the size and number of filter 63, which has a wide range of applications. In addition, the filter support frame 61 is driven to rotate by the first drive unit 62 to replace different filter 63, and the filter 63 switching efficiency is high.

[0085] In one optional embodiment, the filter support frame 61 is configured with a central region and extending arms radiating from the central region. For example, when there are eight filters 63, the filter support frame 61 is configured in a star shape, and the filters 63 are mounted at the ends of the extending arms of the filter support frame 61. The thickness of the extending wall portion of the filter support frame 61 used to mount the filters 63 can be designed to be thinner, which can reduce the distance between the imaging optical path assembly 50 and the imaging device 40, improve the imaging effect of the imaging device 40, and reduce the overall size of the device.

[0086] In one optional embodiment, the first drive unit 62 is a rotary motor, and the output shaft of the rotary motor is connected to the central region of the filter support frame 61.

[0087] More specifically, such as Figure 5 , Figure 3 As shown, the camera device 40 and the first drive unit 62 are respectively mounted in the central area of ​​the mounting bracket 30. The first drive unit 62 is mounted on the mounting bracket 30 via a connecting bracket and is located on the upper side of the camera device 40, so that the filter 63 located on the lowermost side of the filter support bracket 61 is positioned in front of the lens of the camera device 40, making the entire device more compact. Figure 4 , Figure 3 As shown, the imaging optical path assembly 50 includes a fixed optical path, which includes a fixed light source 51 and a beam splitter 53 capable of reflecting and transmitting light. The fixed light source 51 is located on the far side of the viewing hole 112 and is offset to one side of the axis of the viewing hole 112. The beam splitter 53 is obliquely arranged between the imaging device 40 and the viewing hole 112, and is used to reflect the light emitted by the fixed light source 51 toward the viewing hole 112 and to transmit the light emitted from the viewing hole 112 to the imaging device 40.

[0088] The fixed light source 51 is biased to one side of the axis of the viewing hole 112 so as not to block the light emitted from the viewing hole 112 to the camera device 40. Preferably, the fixed light source 51 is biased to the upper side of the viewing hole 112.

[0089] The fixation light source 51 can be a white light source, emitting visible light with a wavelength of 400nm-650nm. The beam splitter 53 is an optical element made of coated glass, capable of reflecting and transmitting light. The beam splitter 53 is tilted to reflect the vertical light emitted by the fixation light source 51 towards the viewing hole 112 of the Placido disk 11. The viewing hole 112 allows the reflected light to pass through and ultimately enter the subject's eye, thus providing a clear fixation target to achieve the effect of fixing the eye's gaze point. At the same time, the beam splitter 53 is located in the imaging optical path of the imaging device 40. The light reflected from the human eye enters the imaging device 40 after passing through the viewing hole 12 and the beam splitter 53, forming an image.

[0090] In an alternative embodiment, as shown in Figure 4 、 ​ Fig. 2, the imaging light path assembly 50 further comprises an imaging objective group 52, which comprises a plano-convex lens 521, a biconcave lens 522 and a biconvex lens 523 arranged in sequence along the central axis direction of the Placido disc 11, and the plano-convex lens 521, the biconcave lens 522 and the biconvex lens 523 are arranged in sequence along the direction from the proximal side to the distal side. Specifically, the plano-convex lens 521, the biconcave lens 522 and the biconvex lens 523 are fixed in the lens barrel at a preset distance, the lens barrel is connected with the light shield 12 and arranged concentrically with the peephole 112.

[0091] The side surface of the plano-convex lens 521 facing the Placido disc 11 is an outward convex surface, the side of the plano-convex lens 521 facing the biconcave lens 522 is a plane, the curvature of the side of the biconcave lens 522 facing the plano-convex lens 521 is smaller than the curvature of the side of the biconcave lens 522 facing the biconvex lens 523, and the curvatures of the two outward convex surfaces of the biconvex lens 523 are equal. The plano-convex lens 521, the biconcave lens 522 and the biconvex lens 523 are fixed in the lens barrel 524 of the objective lens at a preset distance, and the biconcave lens 522 is mainly used to balance the large amount of spherical aberration introduced by the plano-convex lens 521. The difference in curvature of the two sides of the biconcave lens 522 allows the curvature of the side facing away from the plano-convex lens 521 to balance a part of the spherical aberration introduced by the curvature of the side facing the plano-convex lens 521. By controlling the curvature radius of each refractive surface, various aberrations are reduced, and an image with high resolution and high definition can be obtained. The light rays emitted from the peephole 112 of the Placido disc 11 pass through the plano-convex lens 521 and the preliminary light converging effect of the biconcave lens 522, and then pass through the biconvex lens 523 for further convergence. The external light rays can be converged to the image plane in the camera 40 through a shorter distance, realizing high-definition imaging at a near object distance.

[0092] The imaging objective group 52 is located on the side of the beam splitter 53 away from the Placido disc 11, that is, the beam splitter 53 is located on the light path of the imaging of the camera 40, and the light rays projected on the eye converge to the image plane after passing through the beam splitter 53 and the imaging objective group 52 for the camera 40 to shoot. In the embodiment of the present application, the parameters of each lens in the imaging objective group 52 can be set as follows. The curvature radius of the side of the plano-convex lens 521 facing the object to be shot is 8.2 mm, and the vertical distance from the object to be shot is 122 mm. The thickness of the plano-convex lens 521 is 3 mm, the refractive index is 1.78, and the dispersion coefficient is 47.5.

[0093] The distance between the plano-convex lens 521 and the biconcave lens 522 is 1.852 mm, the curvature radius of the side of the biconcave lens 522 facing the plano-convex lens 521 is 16.65 mm, and the curvature radius of the side of the biconcave lens 522 facing away from the plano-convex lens 521 is 6.509 mm. The refractive index of the biconcave lens 522 is 1.76, the dispersion coefficient is 26.6, and the thickness is 1.5 mm.

[0094] The distance between the biconcave lens 522 and the biconvex lens 523 is 3.948 mm, the curvature radius of the side of the biconvex lens 523 facing the biconcave lens 522 is 20.68 mm, and the curvature radius of the side of the biconvex lens 523 facing away from the biconcave lens 522 is 17.090 mm. The thickness of the biconvex lens 523 is 2.22 mm, the refractive index is 1.77, the dispersion coefficient is 49.6, and the vertical distance between the biconvex lens 523 and the image plane is 18.2 mm. It should be noted that the above parameters are not unique, and can be adjusted adaptively according to the material of each lens and the imaging requirements.

[0095] The first direction in the embodiment of the application is the direction of the line connecting the photographed object and the image plane, which is parallel to or overlaps the optical axis of the plano-convex lens 521, the biconcave lens 522 and the biconvex lens 523.

[0096] The imaging device provided by the embodiment of the application can make the external light rays smoothly transition to the image plane through a shorter distance, reduce the difficulty of aberration correction, and realize high-definition imaging at a near distance. The difference in curvature of the two sides of the biconcave lens 522 can correct a large amount of positive spherical aberration (compensate for negative spherical aberration) introduced by the plano-convex lens 521 on the side facing the plano-convex lens 521, and correct a part of the spherical aberration and coma introduced by the front system on the side facing away from the plano-convex lens 521. By controlling the curvature of the above lenses, various aberrations are reduced, and the clarity of the photograph is improved. When the photographed object is the eye surface, the eye surface position can be conjugated to the image plane, and the imaging clarity of the eye surface is increased.

[0097] Obviously, the above embodiment is only an example for clear illustration, and is not a limitation on the implementation. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementations are not required or can not be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the application.

Claims

1. An ocular detection device, characterized in that, The application relates to a projection system, which comprises a Placido disc assembly and an illumination assembly, at least part of the illumination assembly being mounted on the Placido disc assembly. An image monitoring system comprises a camera and an imaging light path assembly; the imaging light path assembly images the image of the illumination assembly projected on the eye through the Placido disc assembly to enable the camera to take pictures. An optical filter assembly is arranged between the imaging light path assembly and the camera, and the optical filter assembly comprises an optical filter support frame and a first driving part for driving the rotation of the optical filter support frame; a plurality of optical filters are arranged on the optical filter support frame in a circumferential direction; the first driving part drives the rotation of the optical filter support frame to move one of the optical filters to the front side of the lens of the camera. The optical filter support frame is configured to have a central region and an extension arm extending from the central region in a radial manner; the optical filters are mounted on the end of the extension arm of the optical filter support frame.

2. An ocular detection device according to claim 1, wherein, The first driving part is a rotary motor, and the output shaft of the rotary motor is connected to the central region of the optical filter support frame.

3. An ocular detection device according to claim 2, wherein, The Placido disc assembly comprises a Placido disc and a reflector arranged on one side of the Placido disc; at least part of the illumination assembly is arranged between the Placido disc and the reflector.

4. The ocular detection device of claim 1, wherein, The imaging light path assembly comprises a fixation light path, which comprises a fixation light source and an inclined beam splitter; a peephole is arranged in the center of the Placido disc; and the light emitted by the fixation light source is reflected by the beam splitter and then projected on the eye through the peephole.

5. The ocular detection device of claim 1, wherein, The imaging light path assembly further comprises an imaging objective lens group, which comprises a plano-convex lens, a double-concave lens and a double-convex lens arranged in sequence along the central axis of the Placido disc; wherein the surface of the plano-convex lens facing the Placido disc is an outward convex surface; the surface of the plano-convex lens facing the double-concave lens is a plane; the curvature of the surface of the double-concave lens facing the plano-convex lens is smaller than the curvature of the surface of the double-concave lens facing the double-convex lens; and the curvatures of the two outward convex surfaces of the double-convex lens are equal.

6. An ocular detection device according to claim 5, wherein, The imaging objective lens group is arranged on the side of the beam splitter away from the Placido disc; and the light projected on the eye is converged to an image plane after passing through the beam splitter and the imaging objective lens group.

7. An ocular detection device according to claim 6, wherein, The illumination assembly comprises a slit illumination assembly, which comprises a first light path and a second light path symmetrically arranged on a mounting bracket; the first light path comprises a first light source and a first optical lens group; the second light path comprises a second light source and a second optical lens group; the first light source is a white light source; the second light source is an infrared light source; a slit light transmission structure is arranged on the first light path and the second light path respectively; the light emitted by the first light source is projected on the reflector through the first light path; the light emitted by the second light source is projected on the reflector through the second light path; and the reflector reflects the light to the Placido disc.

8. An ocular detection device according to claim 4, wherein, ​ 9. An ocular detection device according to claim 8, wherein, The slit light transmission structure comprises a fixed support provided with a light transmission hole, a first sliding seat and a second sliding seat slidingly connected to one side of the fixed support, and a second driving part driving the first sliding seat and the second sliding seat to move in directions away from or close to each other.

10. An ocular detection device according to claim 9, wherein, The second driving part comprises a driving motor, a driving seat connected to an output shaft of the driving motor and moving in a vertical direction, and a first connecting rod and a second connecting rod pivotally connected to the driving seat, one end of the first connecting rod being pivotally connected to the first sliding seat, and one end of the second connecting rod being pivotally connected to the second sliding seat.

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