A refractive compensation device for an ophthalmic imaging apparatus and an ophthalmic imaging apparatus

Abstract

This disclosure provides a refractive compensation device for ophthalmic imaging equipment and an ophthalmic imaging device. The refractive compensation device for the ophthalmic imaging equipment includes: a refractive compensation component and a focusing component; the focusing component includes a driving component, a transmission component, and a follower component; the refractive compensation component is connected to the follower component; the refractive compensation component includes a compensating lens, a compensating lens barrel, a compensating linear lens barrel, a slider, and a compensating cam lens barrel; the compensating lens is connected to the compensating lens barrel, and the compensating lens and the compensating lens barrel are jointly installed inside the compensating linear lens barrel, which is installed inside the compensating cam lens barrel; the compensating cam lens barrel has a curved first groove, and the compensating linear lens barrel has a straight second groove; the slider is disposed on the compensating lens barrel, and the slider is connected to the first groove and the second groove respectively. Through this disclosure, refractive compensation is adjusted in real time and automatic focusing is performed, improving the positional accuracy of the compensating lens during movement.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, specifically to a refractive compensation device for ophthalmic imaging equipment and an ophthalmic imaging equipment. Background Technology

[0002] Refractive compensation devices are an essential component of ophthalmic equipment. When examining patients with different refractive errors, refractive compensation devices are used to correct refractive errors in order to achieve the optimal focal length position and obtain accurate eye examination data. In optical systems, compensation lens groups are used to compensate for aberrations for different patients with different refractive errors, and the position of the compensation lens group corresponds one-to-one with the focal length.

[0003] In current ophthalmological examinations, focusing is usually done manually. However, if manual focusing is inaccurate or frequent, it will prolong the examination time, reduce work efficiency, and affect the patient experience. Therefore, there is an urgent need for a refractive compensation device that can automatically adapt to different refractive powers. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this disclosure is to provide a refractive compensation device for ophthalmic imaging equipment and an ophthalmic imaging equipment.

[0005] To achieve the above objectives, according to a first aspect of this disclosure, a refractive compensation device for an ophthalmic imaging apparatus is provided, comprising: a refractive compensation component and a focusing component;

[0006] The focusing assembly includes a driving component, a transmission component, and a follower component. The driving component is connected to the transmission component, and the transmission component is connected to the follower component.

[0007] The refractive compensation component is connected to the follower component;

[0008] The refractive compensation assembly includes a compensating lens, a compensating lens barrel, a compensating linear lens barrel, a slider, and a compensating cam lens barrel. The compensating lens is connected to the compensating lens barrel, and the compensating lens and the compensating lens barrel are installed together inside the compensating linear lens barrel. The compensating linear lens barrel is installed inside the compensating cam lens barrel.

[0009] The compensating cam lens barrel is provided with a first groove in a curved shape, and the compensating linear lens barrel is provided with a second groove in a straight shape.

[0010] The slider is disposed on the compensation lens barrel, and the slider is connected to the first groove and the second groove respectively.

[0011] Optionally, the driving component includes a motor, which is connected to the transmission assembly and is used to drive the transmission assembly to perform linear motion;

[0012] The follower component includes a gear and a first rack. The gear is connected to the transmission component and works in cooperation with the first rack to convert the linear motion of the transmission component into rotational motion.

[0013] Optionally, a second rack is provided on the outer wall of the compensating cam mirror tube, and the second rack works in cooperation with the gear to allow the compensating cam mirror tube to rotate.

[0014] Optionally, the transmission assembly includes a lead screw, a nut, and a movable base plate;

[0015] One end of the lead screw is connected to the motor, and the nut passes through the lead screw and is mounted on the lead screw. The nut is used to drive the movable base plate to perform linear motion.

[0016] Optionally, the refractive compensation component is disposed on the movable base plate.

[0017] Optionally, it also includes a fixed base plate, on which a guide component is provided, and a movable base plate is disposed on the guide component of the fixed base plate, and the movable base plate moves linearly on the guide component.

[0018] Optionally, the gear is disposed on the movable base plate, and the first rack is fixed on the fixed base plate.

[0019] Optionally, the follower assembly further includes a gear mounting base, through which the gear is mounted on the movable base plate.

[0020] According to a second aspect of this disclosure, an ophthalmic imaging device is provided, including the refractive compensation device and controller for ophthalmic imaging devices provided in the first aspect of this disclosure.

[0021] The refractive compensation device for ophthalmic imaging equipment is used to correct the image quality of images acquired from the examined eye, and the controller is used to adjust the motion information of the drive component of the refractive compensation device for ophthalmic imaging equipment according to the image quality of the image.

[0022] Optionally, the refractive compensation device for ophthalmic imaging equipment further includes a first encoder and a second encoder. The first encoder is mounted on the drive component, and the second encoder is mounted on the follower component. The first encoder is used to feed back motion information and / or position information of the drive component to the controller, and the second encoder is used to feed back motion information and / or position information of the follower component to the controller.

[0023] Compared with the prior art, the embodiments disclosed herein have at least one of the following beneficial effects:

[0024] Through the above technical solution, under the action of the focusing component, by using the compensating cam lens barrel and slider, the curved motion of the slider on the first groove can be converted into the linear motion of the compensating lens and the compensating lens barrel through the rotational motion of the compensating cam lens barrel, thus completing the complex curve transmission process. Moreover, the structure is relatively compact, which can also improve the support strength of the lens barrel and improve the positional accuracy of the compensating lens during the movement process, realize the real-time adjustment of refractive compensation, and quickly complete the autofocus.

[0025] The focusing assembly of the present disclosure uses a single driving component. The driving force generated by the driving component is transmitted to the refractive compensation component through a transmission component and a follower component. The driving component realizes motion control of the refractive compensation component in two dimensions, reducing the complexity of using dual motors. Furthermore, the mechanical transmission method is stable and reliable, and has good repeatability.

[0026] The embodiments of this disclosure employ a refractive compensation device and a controller in an ophthalmic imaging device to determine the optimal focus position through image information and the motion information received from the refractive compensation device, thereby achieving rapid automatic focusing. This method is simple to operate and saves time. Attached Figure Description

[0027] Other features, objects, and advantages of this disclosure will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the overall structure of a refractive compensation device for an ophthalmic imaging apparatus, according to an exemplary embodiment.

[0029] Figure 2 This is a cross-sectional view of a refractive compensation component according to an exemplary embodiment.

[0030] Figure 3 This is a schematic diagram of the structure of a refractive compensation component according to an exemplary embodiment.

[0031] Figure 4 This is a schematic diagram illustrating the relationship between the moving position of the slider on the curve and the focal position during the movement of a compensating lens, according to an exemplary embodiment.

[0032] Figure 5 This is a schematic diagram illustrating the relationship between the movement distance and the focal position of a motor-driven transmission component according to an exemplary embodiment.

[0033] Figure 6 This is a schematic diagram of a light collection path for a tested eye reflecting light, according to an exemplary embodiment.

[0034] Explanation of reference numerals in the attached figures

[0035] 1000 refractive compensation device

[0036] 110 Refractive Compensation Component

[0037] 111 Compensation Lens

[0038] 112 Compensating Lens Tube

[0039] 113 Compensating Cam Lens Tube

[0040] 114 Compensating linear lens tube

[0041] 115 slider

[0042] 116 First Groove

[0043] 117 Second rack

[0044] 121 motor

[0045] 122 Motor Base

[0046] 123 Fixed base plate

[0047] 124 Guide Components

[0048] 130 Transmission Components

[0049] 131 lead screw

[0050] 132 bearing housing

[0051] 133 Nut

[0052] 134 Nut - Movable Base Plate Connector

[0053] 135 Movable base plate

[0054] 141 First rack

[0055] 142 Gears

[0056] 143 Gear Mounting Base

[0057] 150 eyepiece assembly

[0058] 151 Eyepiece

[0059] 152 Eyepiece base

[0060] 153 Front Panel

[0061] 160 eyes examined

[0062] 170 Reflector Assembly

[0063] 180° Convex Lens Assembly

[0064] 190 High-speed scanning galvanometer

[0065] 200 signal acquisition cameras Detailed Implementation

[0066] The present disclosure will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present disclosure, but do not limit the present disclosure in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present disclosure. These all fall within the protection scope of the present disclosure.

[0067] In the above description of this disclosure, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Similarly, the use of the words first, second, and third, etc., does not indicate any order and can be interpreted as names.

[0068] Figure 1 This is a schematic diagram of the overall structure of a refractive compensation device for an ophthalmic imaging apparatus, according to an exemplary embodiment. Figure 2 This is a cross-sectional view of a refractive compensation component according to an exemplary embodiment. Figure 3 This is a schematic diagram of the structure of a refractive compensation component according to an exemplary embodiment.

[0069] like Figures 1 to 3 As shown, this disclosure provides a refractive compensation device 1000 for ophthalmic imaging equipment, including a refractive compensation component 110 and a focusing component. The focusing component is used for focusing, and the refractive compensation component 110 is used for adjusting the focal length, finding the optimal focal position, and improving the image quality of the acquired image of the examined eye.

[0070] The focusing assembly includes a drive assembly, a transmission assembly 130, and a follower assembly. The drive assembly is connected to the transmission assembly 130, and the transmission assembly 130 is connected to the follower assembly. The drive assembly generates driving force, the transmission assembly 130 transmits driving force, and the follower assembly performs motion conversion.

[0071] The refractive compensation component 110 is connected to the follow-up component.

[0072] like Figure 2As shown, the refractive compensation assembly 110 includes a compensation lens 111, a compensation tube 112, a compensation linear tube 114, a slider 115, and a compensation cam tube 113. The compensation lens 111 is connected to the compensation tube 112. The compensation lens 111 and the compensation tube 112 are installed together inside the compensation linear tube 114. The compensation linear tube 114 is installed inside the compensation cam tube 113.

[0073] The compensating lens barrel 112 can move up and down along the inner wall of the compensating linear lens barrel 114, and the compensating cam lens barrel 113 can rotate on the compensating linear lens barrel 114. Thus, through the coordinated movement of the slider 115 with both the compensating cam lens barrel and the compensating linear lens barrel 114, the rotational motion of the compensating cam lens barrel 113 is converted into the linear motion of the compensating lens barrel 112, thereby realizing the linear motion of the compensating lens barrel 112 driving the compensating lens 111.

[0074] The compensating linear tube 114 is used to fix and guide the compensating tube 112, prevent the compensating lens 111 from rotating during movement, and prevent jamming during movement of the compensating tube 112, so that the compensating lens 111 can make smooth linear movement.

[0075] like Figure 3 As shown, the compensating cam lens barrel 113 is provided with a first groove 116 in a curved shape, and the compensating linear lens barrel 114 is provided with a second groove (not shown) in a straight shape.

[0076] The axial direction is usually the direction of a specific line connecting the cornea to the retina, such as the direction of the line connecting the corneal apex to the fovea of ​​the macula. In this disclosure, the axial direction of the eye being examined is horizontal, and the axial direction of the eye being examined can be adjusted according to the actual examination posture of the eye being examined.

[0077] Specifically, the first groove 116 is disposed on the side wall of the compensating cam tube 113, and the second groove is disposed on the side wall of the compensating linear tube 114 in a direction perpendicular to the axial direction of the eye being examined. That is, in this disclosure, the second groove is disposed on the side wall of the compensating linear tube 114 in a vertical direction.

[0078] The slider 115 is mounted on the compensating lens barrel 112, and the slider 115 is connected to the first groove 116 and the second groove respectively.

[0079] The first groove 116 serves as a guide groove for the slider 115 to move in a curved manner relative to the compensating cam mirror barrel 113 on the compensating cam mirror barrel 113, and the second groove serves as a guide groove for the slider 115 to move in a linear manner relative to the compensating linear mirror barrel 114 on the compensating linear mirror barrel 114.

[0080] When the compensating cam tube 113 rotates, the slider 115 moves in a curve along the first groove 116 under the action of the first groove 116, and at the same time moves in a straight line along the second groove under the action of the second groove. The compensating tube 112, which is set inside the compensating straight tube 114, is connected to the slider 115. The compensating tube 112 moves in a straight line along the second groove through the connected slider 115, so that the compensating lens 111 moves in a straight line on the second groove in a direction perpendicular to the axial direction of the examined eye.

[0081] The curve of the first groove 116 is determined by curve fitting based on the focal position and the position of the compensating lens.

[0082] Figure 4 This is a schematic diagram illustrating the relationship between the moving position of the slider on the curve and the focal position during the movement of a compensating lens, according to an exemplary embodiment.

[0083] like Figure 4 As shown, the horizontal axis represents the moving position of slider 115 on the curve where the first groove 116 is located, and the vertical axis represents the focal position. During the movement of the compensating lens 111, the moving position of slider 115 on the curve where the first groove 116 is located corresponds one-to-one with the focal position. By adjusting the position of slider 115, the position of compensating lens 111 can be adjusted, and the focal position can be adjusted in real time to meet the imaging requirements of patients with different refractive errors.

[0084] Through the above technical solution, under the action of the focusing component, by using the compensating cam lens barrel 113 and the slider 115, the rotational movement of the compensating cam lens barrel 113 can realize the action of the first groove 116 on the slider 115, thereby realizing the linear movement of the compensating lens 111 and the compensating lens barrel 112 in the direction perpendicular to the eye axis, completing the complex curve transmission process. Moreover, the structure is relatively compact, which can also improve the support strength of the lens barrel, improve the positional accuracy of the compensating lens 111 during the movement, realize the real-time adjustment of refractive compensation, and quickly complete the autofocus.

[0085] like Figure 1 As shown, in one possible embodiment, the driving component includes a motor 121, which is connected to a transmission assembly 130 to drive the transmission assembly 130 to perform linear motion.

[0086] Among them, motor 121 is used to generate driving force.

[0087] The drive component also includes a motor base 122, which is used to mount and support the motor 121, and the motor 121 is fixed on the motor base 122.

[0088] Figure 5 This is a schematic diagram illustrating the relationship between the movement distance and the focal position of a motor-driven transmission component according to an exemplary embodiment.

[0089] like Figure 5 As shown, the horizontal axis represents the movement distance of the transmission component 130, and the vertical axis represents the focal position. The movement distance of the transmission component 130 corresponds one-to-one with the focal position. When the motor 121 provides the driving force, the focal position can be adjusted in real time according to the movement distance of the transmission component 130 to meet the imaging requirements of patients with different refractive errors.

[0090] Each focal position corresponds to the movement position of a transmission component 130 and the movement position of a slider 115 on the curve. The transmission component 130 is driven by the driving force provided by the motor 121, and the movement position of the slider 115 on the curve of the first groove 116 is adjusted, thereby adjusting the movement position of the compensation lens 111 on the second groove. This enables real-time adjustment of the focal position to meet the imaging requirements of patients with different refractive errors.

[0091] like Figure 1 As shown, in one possible embodiment, the transmission assembly 130 includes a lead screw 131, a nut 133, and a movable base plate 135.

[0092] One end of the lead screw 131 is connected to the motor 121. The nut 133 passes through the lead screw 131 and is set on the lead screw 131. The nut 133 is used to drive the movable base plate 135 to perform linear motion.

[0093] One end of the lead screw 131 is coaxially connected to the motor shaft of the motor 121.

[0094] The transmission assembly 130 also includes a bearing housing 132, and the other end of the lead screw 131 is fixed to the bearing housing 132, which supports the lead screw 131.

[0095] The transmission assembly 130 also includes a nut-movable base plate connecting block 134, which passes through the lead screw 131 and is mounted on the lead screw 131. One end of the nut-movable base plate connecting block 134 is connected to the nut 133, and the other end of the nut-movable base plate connecting block 134 is connected to the movable base plate 135. The nut-movable base plate connecting block 134 is used for power transmission to drive the movable base plate 135 to perform linear motion.

[0096] In the transmission assembly 130, a nut 133 is used. Preferably, the nut 133 is a backlash-eliminating nut, which eliminates the gap caused by the mechanical connection between the lead screw 131 and the movable base plate 135, eliminates the return backlash, and improves the accuracy of motion control.

[0097] In one possible embodiment, a refractive compensation device 1000 for an ophthalmic imaging device further includes a fixed base plate 123, a guide member 124 is provided on the fixed base plate 123, and a movable base plate 135 is provided on the guide member 124 of the fixed base plate 123, and the movable base plate 135 moves linearly on the guide member 124.

[0098] In one possible embodiment, the refractive compensation component 110 is disposed on the movable base plate 135.

[0099] As an example, the guide component 124 can be a guide rail. Two guide rails are provided on the fixed base plate 123. The bottom of the movable base plate 135 is mounted on the guide rails. The movable base plate 135 moves linearly along the guide rails. The direction of this linear movement is the axial direction of the eye being examined 160, thereby enabling the refractive compensation component 110 provided on the movable base plate 135 to move linearly along the axial direction of the eye being examined 160.

[0100] The bearing housing 132 of the transmission assembly 130 disclosed herein is fixed on the base plate 123.

[0101] like Figure 1 As shown, in one possible embodiment, the follower component includes a gear 142 and a first rack 141. The gear 142 is connected to the transmission component 130, and the gear 142 and the first rack 141 work together to convert the linear motion of the transmission component 130 into rotational motion.

[0102] The gear 142 is mounted on the movable base plate 135, and the first rack 141 is fixed on the fixed base plate 123.

[0103] like Figure 1 As shown, in one possible embodiment, the follower assembly further includes a gear mount 143, through which the gear 142 is mounted on the movable base plate 135.

[0104] The outer wall of the compensating cam mirror barrel 113 is provided with a second rack 117, which works in conjunction with the gear 142 to enable the compensating cam mirror barrel 113 to rotate.

[0105] Specifically, the second rack 117 is located at the bottom of the outer wall of the compensating cam lens barrel 113.

[0106] One side of gear 142 engages with the first rack 141, and the other side of gear 142 engages with the second rack 117.

[0107] As an example, when the movable base plate 135 moves linearly on the guide member 124 of the fixed base plate 123, the gear 142 rotates. The gear 142 works in conjunction with the first rack 141 and also works in conjunction with the second rack 117 to compensate for the rotational movement of the cam lens barrel 113.

[0108] The focusing assembly disclosed herein employs a single driving component. Through the transmission assembly 130 and the follower assembly, the driving force generated by the driving component is transmitted to the refractive compensation assembly 110. The driving component realizes motion control of the refractive compensation assembly 110 in two dimensions, reducing the complexity of using dual motors. Furthermore, the mechanical transmission method is stable and reliable, and has good repeatability.

[0109] In one possible embodiment, this disclosure also provides an ophthalmic imaging device, including the refractive compensation device 1000 and controller described above for ophthalmic imaging devices.

[0110] The refractive compensation device 1000 for ophthalmic imaging equipment is used to correct the image quality of images acquired from the examined eye 160, and the controller is used to adjust the motion information of the drive component of the refractive compensation device 1000 for ophthalmic imaging equipment according to the image quality of the image.

[0111] The refractive compensation device 1000 for ophthalmic imaging equipment further includes a first encoder and a second encoder. The first encoder is mounted on the drive assembly, and the second encoder is mounted on the follower assembly. The first encoder is used to feed back motion information and / or position information of the drive assembly to the controller, and the second encoder is used to feed back motion information and / or position information of the follower assembly to the controller.

[0112] like Figure 1 As shown, in one possible embodiment, an ophthalmic imaging device further includes an eyepiece assembly 150, which is mounted on a fixed base plate 123 of a refractive compensation device 1000 for an ophthalmic imaging device. The eyepiece assembly 150 is used to magnify a real image to generate a virtual image.

[0113] The eyepiece assembly 150 includes an eyepiece 151, an eyepiece base 152, and a front panel 153. The eyepiece 151 is fixed to the front panel 153 via the eyepiece base 152, and the front panel 153 is fixed to the fixing base plate 123 of the refractive compensation device 1000 for ophthalmic imaging equipment.

[0114] As an example, the eyepiece 151 can be installed on the eyepiece base 152 by means of a pressure ring or by adhesive bonding. The eyepiece base 152 is fixed to the front panel 153 by screws. Finally, the assembled eyepiece 151, eyepiece base 152 and front panel 153 are installed on the fixed base plate 123.

[0115] Figure 6This is a schematic diagram of a light-collecting path for light reflected from the human eye, according to an exemplary embodiment.

[0116] like Figure 6 As shown, in one possible embodiment, an ophthalmic imaging device further includes a reflector assembly 170, which is disposed above the refractive compensation assembly 110. The reflector assembly 170 is used to fold the optical path and realize the reflection of light.

[0117] In one possible embodiment, an ophthalmic imaging device further includes a convex lens assembly 180 disposed below the fixed base plate 123 and the refractive compensation assembly 110, the convex lens assembly 180 being used to converge light.

[0118] In one possible embodiment, an ophthalmic imaging device further includes a high-speed scanning galvanometer 190, which is disposed below the fixed base plate 123 and the refractive compensation assembly 110, and below the convex lens assembly 180. The high-speed scanning galvanometer 190 is used to transmit the reflected light from the eye being examined 160 to the signal acquisition camera 200.

[0119] In one possible embodiment, an ophthalmic imaging device further includes a signal acquisition camera 200 for collecting reflected light from the examined eye 160 and forming an image.

[0120] like Figure 6 As shown, in one possible embodiment, the ophthalmic imaging device of this disclosure is used to examine the eyes of the examinee, collect the light reflected from the eyes of the examinee, and generate an image. When the compensation lens 111 moves, the reflector assembly 170, the convex lens assembly 180 and the high-speed scanning galvanometer 190 move synchronously, thereby changing the focal position.

[0121] This example illustrates how the compensation lens 111 affects the focal position during movement.

[0122] The light reflected from the examined eye 160 is reflected at the fundus and propagates along the axial direction of the examined eye 160. It is magnified by the eyepiece 151 and then reflected by the mirror assembly 170. The light reflected by the mirror assembly 170 propagates in a direction perpendicular to the axial direction of the examined eye 160. After passing through the compensation lens 111 of the refractive compensation assembly 110, it is converged by the convex lens assembly 180 to the high-speed scanning galvanometer 190. Finally, after being reflected by the high-speed scanning galvanometer 190, it is reflected to the signal acquisition camera 200 to form an image.

[0123] Specifically, in one possible embodiment, the autofocus process includes:

[0124] After receiving the autofocus start signal sent by the host computer, the controller starts the motor 121 of the refractive compensation device 1000. Driven by the motor 121, the driving force generated by the motor 121 is transmitted to the refractive compensation component 110 through the transmission component 130 and the follower component. The force is then applied to the slider 115 through the first groove 116 and the second groove, thereby driving the compensation tube 112 and the compensation lens 111 to move linearly in a direction perpendicular to the axial direction of the examined eye 160.

[0125] During the movement of the compensating lens 111, the first encoder feeds back the motion information and / or position information of the motor 121 to the controller in real time, and the second encoder feeds back the motion information and / or position information of the follower component to the controller in real time. At each movement position of the transmission component 130 driven by the motor 121, light is refracted by the compensating lens 111 and converged onto the convex lens component 180. Then, through the converging effect of the convex lens component 180, it is converged onto the high-speed scanning galvanometer 190, and reflected by the high-speed scanning galvanometer 190 to the signal acquisition camera 200 to form an image. That is, the ophthalmic imaging device acquires the image corresponding to each movement position of the transmission component 130 driven by the motor 121. The signal acquisition camera 200 sends the image to the controller or processor to calculate the fundus image quality of the examined eye 160 corresponding to each movement position of the transmission component 130, and determines the image with the optimal image quality.

[0126] The processor can be integrated into the host computer or set up separately. The controller is preferably a miniature circuit breaker (MCB). The controller and processor can be set up separately or integrated together. This disclosure does not limit the type of processor and controller; any existing processor and controller that can achieve the purpose of this disclosure is applicable.

[0127] Image quality evaluation metrics may include at least one of the following: image sharpness value, signal-to-noise ratio, and resolution.

[0128] When calculating image quality, images within a preset range of the central field of view are preferred, such as images within a 20mm×20mm range at the center of the field of view. These images have less interference information, reducing calculation errors caused by more interference information in the edge areas, improving the accuracy of image quality calculation, and thus improving the control precision of the controller.

[0129] Based on the position of the transmission component 130 corresponding to the image with optimal image quality, such as the image with the maximum sharpness value, the optimal focus position is determined. The controller sends the position signal of the transmission component 130 corresponding to the optimal focus position to the motor 121. After receiving the position signal of the transmission component 130 corresponding to the optimal focus position, the motor 121 rotates and drives the transmission component 130 to move to the position of the transmission component 130 corresponding to the optimal focus position. At the same time, the first groove 116 acts on the slider 115, and the slider 115 moves on the first groove 116 to the position corresponding to the optimal focus position. The second groove also acts on the slider 115, and the slider 115 moves on the second groove at the same time. Under the action of the movement of the slider 115, the compensation lens 111 also moves with the slider 115 to the position corresponding to the optimal focus, thereby realizing autofocus.

[0130] The prerequisite for the autofocus process is to calibrate the transmission component 130 and the refractive compensation component 110 to the initial zero position, that is, to stop the transmission component 130 and the refractive compensation component 110 at the optimal focal position corresponding to zero diopter.

[0131] Based on the sharpness value of the fundus image of the examined eye 160 obtained by the ophthalmic imaging equipment, the positions of the transmission component 130 and the refractive compensation component 110 are adjusted to achieve the position of the transmission component 130 and the refractive compensation component 110 corresponding to the maximum sharpness value of the fundus image of the examined eye 160, that is, the optimal position of the transmission component 130 and the refractive compensation component 110 under zero refractive power, which is the optimal focal position. After calibrating the initial zero position, automatic focusing is performed.

[0132] In another possible embodiment, the movement direction of the transmission assembly 130 is adjusted and autofocus is performed based on the fundus image quality information of the examined eye 160.

[0133] When the motor 121 drives the transmission component 130 to move in a certain direction, such as the motor 121 driving the transmission component 130 to move in a certain direction according to a preset step distance ΔL, at the same time, the slider 115 of the refractive compensation component 110 moves along the first groove 116 according to the preset compensation curve f(ΔL) under the action of the first groove 116. The sharpness value of the fundus image of the examinee's eye 160 is calculated. Based on the change in the sharpness value of the fundus image of the examinee's eye 160, the movement direction of the transmission component 130 is judged to be correct, and it is judged whether the optimal focal position has been reached. The controller of the ophthalmic imaging device controls the movement of the transmission component 130 according to the judgment information.

[0134] If the sharpness value of the fundus image of the examined eye 160 decreases, the transmission component 130 is adjusted to move in the opposite direction, and the slider 115 of the refractive compensation component 110 moves in the first groove 116 according to the preset compensation curve. If the sharpness value of the fundus image of the examined eye 160 increases, the transmission component 130 continues to move in that direction, and the slider 115 of the refractive compensation component 110 moves in the first groove 116 according to the preset compensation curve.

[0135] The preset compensation curve is the curve where the first groove 116 is located.

[0136] When the sharpness value of the fundus image of the examined eye 160 reaches its maximum, the motor 121 and the refractive compensation component 110 reach the optimal focal position, that is, the best imaging position.

[0137] When the optimal focal position is reached, the current focal position is fed back by the rotation of the motor 121 detected by the first encoder and the rotation of the gear 142 detected by the second encoder.

[0138] If the optimal focal position is not reached, the transmission component 130 is controlled to move according to the sharpness value of the fundus image of the examined eye 160, and the positions of the transmission component 130 and the refractive compensation component 110 are adjusted until the sharpness value of the fundus image of the examined eye 160 reaches the maximum, thereby determining the optimal focal position and achieving automatic focusing.

[0139] Through the above technical solution, the ophthalmic imaging device disclosed herein determines the optimal focus position by using imaging information and received signal strength, achieving rapid automatic focusing, simple operation, and saving time.

[0140] The specific embodiments of this disclosure have been described above. It should be understood that this disclosure is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this disclosure. The above-described preferred features can be used in any combination without conflict.

Claims

1. A refractive compensation device for ophthalmic imaging equipment, characterized in that, include: Refractive compensation components and focusing components; The focusing assembly includes a driving component, a transmission component, and a follower component. The driving component is connected to the transmission component, and the transmission component is connected to the follower component. The refractive compensation component is connected to the follower component; The refractive compensation assembly includes a compensating lens, a compensating lens barrel, a compensating linear lens barrel, a slider, and a compensating cam lens barrel. The compensating lens is connected to the compensating lens barrel, and the compensating lens and the compensating lens barrel are installed together inside the compensating linear lens barrel. The compensating linear lens barrel is installed inside the compensating cam lens barrel. The compensating cam lens barrel is provided with a first groove in a curved shape, and the compensating linear lens barrel is provided with a second groove in a straight shape. The curve of the first groove is determined by curve fitting based on the focal position and the position of the compensating lens. The slider is disposed on the compensation lens barrel, and the slider is connected to the first groove and the second groove respectively; It also includes a movable base plate and a fixed base plate, wherein the movable base plate is disposed on the fixed base plate; The refractive compensation component is mounted on the movable base plate; The transmission assembly includes a lead screw and a backlash-free nut, the backlash-free nut passing through the lead screw and mounted on the lead screw, and the transmission assembly is used to drive the movable base plate to move linearly along the lead screw; The outer wall of the compensating cam mirror tube is provided with a second rack; The follower component includes a gear and a first rack. The gear is disposed on the movable base plate, and the first rack is fixed on the fixed base plate. One side of the gear meshes with the first rack, and the other side meshes with the second rack. Thus, when the movable base plate moves in a straight line, the gear converts the straight line motion into the rotational motion of the compensating cam lens barrel.

2. The refractive compensation device for ophthalmic imaging equipment according to claim 1, characterized in that, The driving component includes a motor, which is connected to the transmission assembly and is used to drive the transmission assembly to perform linear motion.

3. The refractive compensation device for ophthalmic imaging equipment according to claim 1, characterized in that, A guide component is provided on the fixed base plate, and the movable base plate is disposed on the guide component of the fixed base plate, and the movable base plate moves linearly on the guide component.

4. The refractive compensation device for ophthalmic imaging equipment according to claim 1, characterized in that, The follower assembly also includes a gear mounting base, through which the gear is mounted on the movable base plate.

5. An ophthalmic imaging device, characterized in that, Includes the refractive compensation device and controller for ophthalmic imaging equipment as described in any one of claims 1 to 4. The refractive compensation device for ophthalmic imaging equipment is used to correct the image quality of images acquired from the examined eye, and the controller is used to adjust the motion information of the drive component of the refractive compensation device for ophthalmic imaging equipment according to the image quality of the image.

6. The ophthalmic imaging device according to claim 5, characterized in that, The refractive compensation device for ophthalmic imaging equipment further includes a first encoder and a second encoder. The first encoder is installed on the drive component, and the second encoder is installed on the follower component. The first encoder is used to feed back motion information and / or position information of the drive component to the controller, and the second encoder is used to feed back motion information and / or position information of the follower component to the controller.

Images