Calibration device for ophthalmology imaging equipment

Abstract

The invention relates to a calibration device for ophthalmology imaging equipment, and relates to the field of ophthalmology imaging related technologies, and the calibration device comprises an imager, a head bracket, a movable support frame, a jaw support, a forehead support, a linkage mechanism and a calibration mechanism. When a patient needs to finely adjust the head angle due to discomfort, the jaw support cannot rotate along with the patient, local pressure concentration is easily caused, friction burning pain is generated, and the adaptability of the patient is affected; secondly, symmetrical straight line clamping or simple cushion block supporting is mostly adopted for lateral positioning, adaptability to face contour changes of cheekbones, jaw bones and the like is lacked, and positioning deviation or oppression discomfort is easily caused; and thirdly, the problems that the existing device lacks a multi-direction linkage automatic calibration mechanism, manual intervention is needed for multiple times in operation, the calibration precision and efficiency are low, and the alignment requirement of high-precision ophthalmology imaging is difficult to meet are solved.

Description

Technical Field

[0001] This invention relates to the field of ophthalmic imaging technology, and in particular to a calibration device for ophthalmic imaging equipment. Background Technology

[0002] Ophthalmic imaging technology is a core support for the diagnosis of modern eye diseases, and its image quality directly determines the accuracy and reliability of diagnostic information. When using ophthalmic imaging equipment (such as fundus cameras and OCT), the patient's head must be stably fixed in a specific position, ensuring precise alignment of key targets such as the center of the pupils and the corneal apex with the optical axis of the equipment. Currently, commonly used head fixation methods in clinical practice rely on combinations of headrests, chin rests, and forehead straps. Their core function is to restrict head movement and provide basic height and anteroposterior position adjustments. While these devices have become standard auxiliary configurations for ophthalmic imaging equipment, their structural design and adjustment mechanisms still have significant limitations, affecting clinical operational efficiency and patient experience.

[0003] In existing technologies, numerous patents and products have focused on optimizing head positioning structures. For example, Chinese patent CN215272666U discloses a head positioning device for ophthalmic examinations, including an installation mechanism and a stabilizing mechanism. The stabilizing mechanism is located on the outer surface of the installation mechanism, a support plate is located at the lower end of the base plate, scale lines are located on the outer surface of the base plate, an adjustment hole is formed on the outer surface of the base plate, a moving groove is formed on the upper surface of the base plate, a placement block is located at the upper end of the base plate, the base plate is movably connected to a pushing block through the adjustment hole and the moving groove, square blocks are provided at both ends of the pushing block, a threaded hole is formed on one side of the pushing block, a longitudinal clamping block is connected to the outer surface of the pushing block, a handle is installed on the outer surface of the pushing block, the pushing block is connected to the moving groove and the sliding groove through the square blocks, the pushing block is connected to the adjustment hole through the threaded hole, and the pushing block is connected to the side plate through the handle. The pushing block is moved and slid within the moving groove and the sliding groove according to the patient's head circumference, the scale lines are observed, and the threaded hole and the adjustment hole are fixed with bolts for easy adjustment.

[0004] The existing technologies described above have the following main drawbacks: First, the connection between the chin rest and the patient's chin is mostly fixed or has limited degrees of freedom. When the patient needs to fine-tune the head angle due to discomfort, the chin rest cannot rotate accordingly, easily leading to concentrated local pressure, causing friction and burning pain, and affecting patient cooperation. Second, lateral positioning often uses symmetrical linear clamping or simple pad support, lacking the ability to adapt to changes in facial contours such as the cheekbone and jawbone, easily causing positioning deviations or pressure discomfort. Third, existing devices lack a multi-directional linkage automatic calibration mechanism, requiring multiple manual interventions, resulting in low calibration accuracy and efficiency, making it difficult to meet the alignment requirements of high-precision ophthalmic imaging. Therefore, there is an urgent need in this field for a multi-degree-of-freedom positioning and calibration device that can achieve comfortable, accurate, and rapid adaptive head positioning to improve the efficiency and diagnostic accuracy of ophthalmic imaging examinations. Summary of the Invention

[0005] The purpose of this invention is to provide a calibration device for ophthalmic imaging equipment, which can achieve rapid, multi-directional adaptive positioning and calibration of the patient's head, thereby improving imaging accuracy and comfort.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A calibration device for ophthalmic imaging equipment includes an imager; a headrest that is slidably connected to the imager via a movable support frame; a chin rest that is connected to the lower end of the headrest by horizontal rotation, and the chin rest is temporarily locked to the headrest when not in use; a forehead rest that is positioned at the upper end of the headrest; and a linkage mechanism that is linked to the forehead rest at its upper middle part. The linkage mechanism is connected to the headrest via an electric push rod. A calibration mechanism is symmetrically arranged on both sides of the middle of the headrest. The linkage mechanism and the calibration mechanism are used to calibrate the horizontal angle of the head of an incoming person.

[0007] As a preferred embodiment of the present invention, the chin support includes a support rod. The lower end of the support rod is connected to a circular groove at the lower end of the headrest via a bearing. The upper end of the support rod is connected to a base support. A trigger is slidably disposed in a hidden groove in the middle of the base support. The lower end of the trigger is connected to the upper end of a connecting rod. A polygonal locking head is installed at the lower end of the connecting rod. A return spring is connected to the lower end of the locking groove. The lower ends of the locking groove and the circular groove are in communication.

[0008] As a preferred embodiment of the present invention, the locking groove is composed of a polygonal groove and an expanded groove connected vertically. The locking head of the initial height is inserted into the polygonal groove to temporarily lock the position of the support rod and the head bracket. The bottom support and the trigger are elastically connected.

[0009] As a preferred embodiment of the present invention, the forehead support includes a top cover, a sliding rod is installed on the upper end of the top cover, the sliding rod is slidably disposed on the upper end of the head support, and a forehead alignment member is installed on the rear side of the upper end of the head support.

[0010] As a preferred embodiment of the present invention, the forehead alignment component includes a movable frame, which is fixedly installed on the upper rear side of the head support. The interior of the movable frame is connected to the front end of the arc-shaped component via a pin. A pressing component is installed on the arc-shaped surface of the front end of the arc-shaped component, and a pressing component that is used in conjunction with the pressing component is slidably disposed on the upper end of the movable frame.

[0011] As a preferred embodiment of the present invention, the linkage mechanism includes a linkage frame, which is connected to the upper end of the sliding rod. An electric push rod is connected to the middle of the upper end of the head support in the middle of the linkage frame. Squeezing blocks are symmetrically installed at the left and right ends of the linkage frame. The lower end of the squeezing block has a downwardly sloping structure from the inside to the outside. Correcting elements are symmetrically installed on the inner side of the squeezing block. The spacing between the lower half of the correcting elements arranged in the front and back gradually increases from top to bottom.

[0012] As a preferred embodiment of the present invention, the calibration mechanism includes a connecting frame, a pressing frame is horizontally slidably disposed inside the connecting frame, a rotatable reset rotating component is disposed inside the pressing frame, the lower end of the reset rotating component is connected to the expansion panel through a linkage rod, and a fitting component that cooperates with the reset rotating component is slidably disposed in a fixed plate, and the fixed plate is fixedly installed inside the pressing frame.

[0013] As a preferred embodiment of the present invention, the upper end of the extrusion frame is provided with an insertion groove, the straightening member extends into the insertion groove, a rollable drag-reducing roller is provided at the outer corner of the upper end of the extrusion frame, and a spring telescopic rod is connected between the extrusion frame and the connecting frame.

[0014] As a preferred embodiment of the present invention, the reset rotating component includes a connecting plate, which is fixedly installed inside the extrusion frame. The connecting plate is connected to the rotating shaft of the T-shaped structure via a bearing. A connecting column is installed at the lower end of the rotating shaft, and the connecting column is connected to the outer end of the linkage rod. A torque spring is connected between the rotating shaft and the connecting plate. A coaxial column is installed at the upper end of the rotating shaft, and a blocking column is coaxially installed at the upper end of the coaxial column. A straightening plate is installed on the outer rear side of the coaxial column, and the straightening plate and the straightening component are used in a pressing fit.

[0015] As a preferred embodiment of the present invention, the outer wall of the middle part of the coaxial column is provided with an arc-shaped extrusion groove, which is composed of an equal-width groove and a narrowing groove connected clockwise, and the width of the narrowing groove gradually decreases in the clockwise direction.

[0016] As a preferred embodiment of the present invention, the upper end of the blocking post is provided with a straight groove, the straight groove and the straight plate are oriented in the same direction, and the sliding head corresponding to the position of the straight groove is fixedly installed at the upper end of the connecting frame.

[0017] As a preferred embodiment of the present invention, the bonding component includes a bonding plate, the upper end of which is connected to an extrusion rod. The extrusion rod is slidably disposed in a fixed plate, and the extrusion rod and the fixed plate are elastically connected. The outer arc-shaped head of the extrusion rod is fitted with an extrusion groove, and the lower end of the bonding plate is connected to an extrusion frame through an elastic telescopic rod.

[0018] In summary, this application includes the following beneficial technical effects: 1. Through the coordinated operation of the chin rest, forehead rest, and symmetrically arranged calibration mechanisms, multi-directional adaptive positioning and fine-tuning of the head in vertical, horizontal, and other directions is achieved. For cases of slight head deviation, precise control and calibration can be achieved, effectively ensuring that the head position is accurately aligned with the optical reference of the imaging device, and significantly improving the positioning accuracy of the imaging area.

[0019] The chin rest uses a trigger-activated unlocking structure that automatically releases the lock after the patient's chin is placed on it. It can rotate slightly with the head, avoiding the friction and pressure caused by traditional fixed support methods, and greatly improving the patient's comfort.

[0020] The linkage mechanism and calibration mechanism are driven by an electric push rod, which realizes one-button descent and multi-point synchronous compression correction. The structure is reliable and the action is coordinated, which effectively shortens the calibration time and improves the inspection efficiency.

[0021] The calibration mechanism is equipped with a horizontally movable fitting plate and an expansion plate, which can automatically fit the middle and back areas of the face according to different face shapes, forming a wrap-around positioning, dispersing pressure, and avoiding discomfort or deviation caused by single-point pressure. Attached Figure Description

[0022] Figure 1 This is a first structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the second structure of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is the present invention. Figure 3 AA section view; Figure 5 This is the present invention. Figure 4 A partial schematic diagram; Figure 6 This is a first structural schematic diagram of the relationship between the extrusion block, the straightening component, and the calibration mechanism of the present invention; Figure 7 This is a second structural diagram of the relationship between the extrusion block, the straightening component, and the calibration mechanism of the present invention; Figure 8 This is a cross-sectional view of the forehead alignment component of the present invention; Figure 9 This is a cross-sectional view (viewed from top to bottom) of the coaxial column and extrusion groove of the present invention. Figure 10 This is the present invention. Figure 4 A magnified view of the area at point X.

[0023] Explanation of reference numerals in the attached drawings: 1. Imaging device; 2. Headrest; 3. Movable support frame; 4. Chin rest; 41. Support rod; 42. Circular groove; 43. Base support; 44. Trigger element; 45. Connecting rod; 46. Locking head; 47. Locking groove; 48. Return spring; 5. Forehead support; 51. Top cover; 52. Sliding rod; 53. Forehead alignment element; 531. Movable frame; 532. Arc-shaped element; 533. Pressing element; 534. Pressing element; 6. Linkage mechanism; 61. Linkage frame; 62. Electric push rod; 63. Squeezing block; 64. Correction element; 7. Calibration mechanism; 71. Connecting frame; 711. Sliding head; 72. Extrusion frame; 721. Drag-reducing roller; 73. Reset rotating component; 731. Connecting plate; 732. Rotating shaft; 733. Connecting column; 734. Torque spring; 735. Coaxial column; 7351. Extrusion groove; 736. Blocking column; 7361. Straight groove; 737. Correction plate; 74. Linkage rod; 75. Expanding plate; 76. Adhesive component; 761. Adhesive plate; 762. Extrusion rod; 763. Elastic telescopic rod; 77. Fixing plate; 78. Spring telescopic rod. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1 to 10 This application will be described in further detail.

[0025] This application discloses a calibration device for ophthalmic imaging equipment. In the use of ophthalmic imaging equipment, headrest calibration is a key operation to ensure imaging accuracy. The person places their head into the headrest 2, determines the orientation of their side face, and calibrates the micro-angle orientation of the face by squeezing and linking. Then, the forehead support 5 and chin support 4 are used to position the head as a whole, ensuring that the device reference is precisely aligned with the optical reference of the imaging equipment (such as the lens center and scanning range). After calibration, when the subject's head is fixed, the target parts such as the pupil and cornea can fall exactly within the effective observation range, improving examination efficiency and the reliability of diagnostic data.

[0026] Reference Figures 1 to 4As shown, this embodiment discloses a calibration device for ophthalmic imaging equipment, including an imager 1, a headrest 2, a movable support frame 3, a chin rest 4, a forehead rest 5, a linkage mechanism 6, and a calibration mechanism 7. The imager 1 is a fixed base. The headrest 2 is slidably connected to the imager 1 through the movable support frame 3. The chin rest 4 is connected to the lower end of the headrest 2 by horizontal rotation, and the chin rest 4 is temporarily locked to the headrest 2 when not in use. The forehead rest 5 is located at the upper end of the headrest 2. The upper middle part of the linkage mechanism 6 is linked with the forehead rest 5. The linkage mechanism 6 is connected to the headrest 2 through an electric push rod 7. The calibration mechanism 7 is symmetrically arranged on the left and right sides of the middle part of the headrest 2. The linkage mechanism 6 and the calibration mechanism 7 are used to calibrate the horizontal angle of the head of the person entering. The imager 1 is a prior art device and is an existing imaging component in this calibration device. It adopts mature optical imaging technology and is used for image acquisition and analysis of eye structures (such as pupil, cornea, etc.). It integrates an image sensor and optical lens, which, in conjunction with calibrated head positioning, ensures that the target area accurately falls within the center of the field of view or the scanning range. As the system's detection terminal, this imager provides reliable image data for diagnosis; its specific structure and imaging principle are well-known in the field.

[0027] In practice, the subject places their head within the headrest 2, with their chin resting smoothly on the chin rest 4. The operator uses the calibration mechanisms 7 on both sides to initially determine the orientation of the subject's face. Then, the linkage mechanism 6 is activated, lowering the entire head and working in conjunction with the calibration mechanisms 7 to finely adjust the head angle. Simultaneously, the forehead rest 5 moves downwards, supporting the head from above to complete the superior positioning. Through the coordination of the chin rest 4, forehead rest 5, and the calibration mechanisms 7 on both sides, effective fixation of the head in multiple directions is achieved. Finally, the existing imaging device 1 is used to acquire and examine images of the subject's eyes.

[0028] Reference Figure 10 As shown, in the process of supporting the chin, the existing support structure is a fixed connection. When the chin needs to rotate at a horizontal angle, the two generate friction, causing discomfort. This application further improves the structure of the chin support 4. The specific structure is as follows: The chin support 4 includes a support rod 41. The lower end of the support rod 41 is connected to the circular groove 42 opened at the lower end of the head support 2 through a bearing. The upper end of the support rod 41 is connected to a base support 43. A trigger 44 is slidably arranged in a hidden groove opened in the middle of the base support 43. The lower end of the trigger 44 is connected to the upper end of the connecting rod 45. A polygonal locking head 46 is installed at the lower end of the connecting rod 45. A return spring 48 is connected to the lower end of the locking head 46 and the locking groove 47. The return spring 48 has the effects of rotational reset and height reset, ensuring that the locking head 46 can rise back and lock into the polygonal groove after descending. The lower ends of the locking groove 47 and the circular groove 42 are in a connected state.

[0029] Reference Figure 10 As shown, the locking groove 47 is composed of a polygonal groove and an expanded groove connected vertically. The initial height locking head 46 is inserted into the polygonal groove to temporarily lock the position of the support rod 41 and the head bracket 2. The structure between the polygonal groove and the locking head 46 fits together, and the bottom support 43 and the trigger 44 are elastically connected.

[0030] In the actual adjustment process, initially, the locking head 46 engages with the polygonal groove, temporarily locking the positions of the support rod 41 and the headrest 2. When the subject's chin is placed on the base support 43, the trigger 44 is compressed and moves downward into the hidden groove. At this time, the connecting rod 45 connected to the trigger 44 and the locking head 46 move downward simultaneously, and the locking head 46 disengages from the polygonal groove and enters the expanding groove. This action releases the locking of the support rod 41 and the headrest 2, allowing the base support 43 to rotate. Subsequently, when fine-tuning the head angle, the chin rest 4 can be adjusted synchronously, thereby reducing friction between the chin and the chin rest 4 and reducing the subject's discomfort.

[0031] Reference Figure 4 , Figure 8 As shown, the forehead support 5 includes a top cover 51, a sliding rod 52 is installed on the upper end of the top cover 51, the sliding rod 52 is slidably disposed on the upper end of the head support 2, and a forehead alignment member 53 is installed on the rear side of the upper end of the head support 2.

[0032] Reference Figure 8 As shown, the forehead alignment component 53 includes a movable frame 531, which is fixedly installed on the upper rear side of the head support 2. The interior of the movable frame 531 is connected to the front end of the arc-shaped component 532 through a pin. A pressing component 533 is installed on the arc-shaped surface of the front end of the arc-shaped component 532. A pressing component 534, which is used to press and cooperate with the pressing component 533, is slidably disposed on the upper end of the movable frame 531.

[0033] Reference Figure 4As shown, the linkage mechanism 6 includes a linkage frame 61, which is connected to the upper end of the sliding rod 52. The middle part of the linkage frame 61 is connected to the upper middle part of the head support 2 by an electric push rod 62. The left and right ends of the linkage frame 61 are symmetrically equipped with compression blocks 63. The lower end of the compression block 63 has a gradually downward inclined structure from the inside to the outside. The inner side of the compression block 63 is symmetrically equipped with correction elements 64. The spacing between the lower half of the correction elements 64 arranged in the front and back gradually increases from top to bottom. After the subject's head enters the head support 2, the expansion panel 75 is compressed and rotates backward along the connecting column 733. At the same time, the correction plate 737 rotates synchronously to a position below the correction element 64 (not necessarily directly below). As the correction element 64 descends, the position of the correction plate 737 is corrected by the compression of the correction elements 64 on both sides. The lower half of the correction elements 64 arranged in the front and back has an open structure, which reduces the difficulty for the correction plate 737 to enter between the correction elements 64.

[0034] In actual operation, when the subject's head enters the head support 2, the curved piece 532 close to the forehead can be used as a reference for initial head positioning. After the head is calibrated, the electric push rod 62 drives the linkage frame 61 and the top cover 51 to descend, and the top cover 51 limits and fixes the head from above. At the same time, the descending linkage frame 61 presses down on the pressing piece 534, which in turn pushes the pressing piece 533 to move, causing the curved piece 532 to adjust its angle upward, so that it is removed from the forehead area, avoiding interference with subsequent eye examinations.

[0035] Reference Figures 5-7 As shown, this application uses a calibration mechanism 7 to adjust the position of a person's face so that it faces the imager 1, ensuring that the device reference is precisely aligned with the optical reference of the imager (such as the lens center and scanning range). The structure of the calibration mechanism 7 is as follows: the calibration mechanism 7 includes a connecting frame 71, a pressing frame 72 is horizontally slidably arranged inside the connecting frame 71, a rotatable reset rotating member 73 is arranged inside the pressing frame 72, the lower end of the reset rotating member 73 is connected to the expansion panel 75 through a linkage rod 74, and a fitting member 76 that cooperates with the reset rotating member 73 is slidably arranged in a fixing plate 77, and the fixing plate 77 is fixedly installed inside the pressing frame 72.

[0036] Reference Figure 1 , Figure 4 As shown, the upper end of the extrusion frame 72 is provided with an insertion groove, and the straightening member 64 extends into the insertion groove. A rollable drag-reducing roller 721 is provided at the outer corner of the upper end of the extrusion frame 72 to reduce the extrusion resistance. A spring telescopic rod 78 is connected between the extrusion frame 72 and the connecting frame 71 to play the role of elastic reset.

[0037] Reference Figure 5 , Figure 9As shown, the reset rotating component 73 includes a connecting plate 731, which is fixedly installed inside the extrusion frame 72. The connecting plate 731 is connected to the rotating shaft 732 of the T-shaped structure via a bearing. A connecting column 733 is installed at the lower end of the rotating shaft 732, and the connecting column 733 is connected to the outer end of the linkage rod 74. A torque spring 734 is connected between the rotating shaft 732 and the connecting plate 731. A coaxial column 735 is installed at the upper end of the rotating shaft 732, and a blocking column 736 is coaxially installed at the upper end of the coaxial column 735. A straightening plate 737 is installed on the rear outer side of the coaxial column 735. The angle formed between the straightening plate 737 and the expanding plate 75 is... If the angle difference is greater than 90 degrees, based on the contour of the person's face, after the subject's head enters the head support 2, the expansion panel 75, which is attached to the side of the face, is offset backward and inward. The correction plate 737 and the correction component 64 are used in a pressing fit. The outer wall of the middle part of the coaxial column 735 has an arc-shaped pressing groove 7351. The pressing groove 7351 is composed of an equal-width groove and a narrowing groove connected clockwise. The width of the narrowing groove gradually decreases in the clockwise direction. The pressing groove 7351 is set on the coaxial column 735, and its function is to push the pressing rod 762 inward during the rotation of the coaxial column 735, so that the fitting plate 761 fits the side of the face more tightly. To achieve this function, the width of the arc-shaped pressing groove 7351 needs to gradually decrease in the clockwise direction. When the extrusion rod 762 passes through the first half of the equal-width groove area, its position remains unchanged and no pushing is required; however, when it enters the area where the width gradually narrows, the extrusion rod 762 is gradually pushed inward, thereby achieving the expected pushing effect; the upper end of the blocking post 736 is provided with a straight groove 7361, the straight groove 7361 and the straight plate 737 are oriented in the same direction, and the sliding head 711 corresponding to the position of the straight groove 7361 is fixedly installed at the upper end of the connecting frame 71. When the straight plate 737 has not rotated to the specified angle, the straight groove 7361 and the sliding head 711 are staggered and not completely aligned. Therefore, the sliding head 711 will be blocked by the blocking post 736, which temporarily locks the position of the extrusion frame 72.

[0038] Reference Figure 5 As shown, the bonding component 76 includes a bonding plate 761, the upper end of which is connected to an extrusion rod 762. The extrusion rod 762 is slidably disposed in a fixed plate 77, and the extrusion rod 762 and the fixed plate 77 are elastically connected. The outer arc-shaped head of the extrusion rod 762 is in contact with the extrusion groove 7351. The lower end of the bonding plate 761 is connected to the extrusion frame 72 through an elastic telescopic rod 763.

[0039] During the actual adjustment process, when the subject's head enters the headrest 2, their side face will contact the widening panel 75, triggering the widening panel 75 to rotate backward along the connecting column 733. The two widening panels 75 rotate backward to varying degrees according to the facial contour, simultaneously driving the coaxial column 735 and the correction plate 737 to rotate synchronously and evenly until the correction plate 737 rotates to below the correction component 64. During rotation, the compression rod 762 is compressed by the compression groove 7351 in the coaxial column 735, causing it to move horizontally and move the bonding plate 761 inward, further fitting it to the side position (at this time, the bonding plate 761 is fitted to the middle of the side face, and the widening panel 75 is fitted to the area near the mouth of the side face, forming a wrap-around fit). Subsequently, the electric push rod 62 drives the linkage frame 61, the correction component 64, and the compression block 63 to descend, through the two sides... The descent of the straightening component 64 further compresses and straightens the horizontal position of the straightening plate 737, straightening it to a specified angle (the straight groove 7361 in the following blocking column 736 aligns with the sliding head 711, releasing the limit on the sliding head 711, and the compression frame 72 is unlocked accordingly). At this time, the expansion panel 75, which is arranged coaxially with the straightening plate 737, undergoes another angle adjustment, driving the head to rotate. This angle adjustment can calibrate the operation. After calibration, the synchronously descending compression block 63 contacts the drag-reducing roller 721, and then the inclined structure of the compression block 63 squeezes the compression frame 72 to move inward, thereby further limiting the side position.

[0040] Working principle: Step 1: Using the arc-shaped part 532 as the reference for placement, the subject places his head into the headrest 2, with his chin naturally resting on the jaw rest 4. The weight of the chin triggers the internal locking mechanism of the jaw rest to release the fixation of the support rod 41, allowing the jaw rest to rotate slightly with the head. At the same time, the side of the face will come into contact with the expansion panel 75, triggering the expansion panel 75 to rotate backward along the connecting column 733. Step 2: Drive the linkage frame 61, the corrector 64, and the compression block 63 to descend via the electric push rod 62. The descent of the corrector 64 on both sides further compresses and corrects the horizontal position of the corrector plate 737 to the specified angle. At this time, the expansion panel 75, which is arranged on the same axis as the corrector plate 737, undergoes another angle adjustment, which drives the head to rotate, so that the face is precisely aligned with the optical reference of the imaging device. Step 3: As the linkage frame 61 drives the extrusion block 63 to descend further, the extrusion block 63 comes into contact with the drag-reducing roller 721. Then, the inclined structure of the extrusion block 63 extrudes the extrusion frame 72 to move inward, thereby further limiting the position of the side face. After descending to the lowest position, the extrusion frame 72 moving inward drives the bonding plate 761 and the expansion plate 75 to position the side face of the calibrated head, and the descending forehead support 5 restricts the movement of the head from above. Step 4: Precisely align the head position with the optical center of imager 1, and use imager 1 to acquire and examine the eyes, obtaining clear and accurate eye image data. Throughout the examination, the chin rest, forehead rest, and calibration mechanism continuously and stably fix the head position, ensuring that the imager can scan and acquire data stably, avoiding image blurring or inaccurate data due to head movement or positional deviation.

[0041] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A calibration device for ophthalmic imaging equipment, characterized in that, include: Imager; The head support frame is slidably connected to the imager via a movable support frame. The chin rest connects to the lower end of the headrest by rotating horizontally, and the chin rest is temporarily locked to the headrest when not in use. The forehead support is located at the upper end of the headrest. The linkage mechanism works in conjunction with the forehead support at its upper middle section. The linkage mechanism is connected to the head support frame via an electric push rod. The head support frame has symmetrical calibration mechanisms on the left and right sides of its middle section. The linkage mechanism and the calibration mechanism are used to calibrate the horizontal angle of the head of the person entering the frame.

2. The calibration device for ophthalmic imaging equipment according to claim 1, characterized in that: The chin support includes a support rod. The lower end of the support rod is connected to a circular groove at the lower end of the headrest via a bearing. The upper end of the support rod is connected to a base support. A trigger is slidably disposed in a hidden groove in the middle of the base support. The lower end of the trigger is connected to the upper end of a connecting rod. A polygonal locking head is installed at the lower end of the connecting rod. A return spring is connected to the lower end of the locking head and the locking groove. The locking groove and the lower end of the circular groove are in a connected state.

3. The calibration device for ophthalmic imaging equipment according to claim 2, characterized in that: The locking groove is composed of a polygonal groove and an expanded groove connected vertically. The initial height locking head is inserted into the polygonal groove to temporarily lock the position of the support rod and the head bracket. The bottom support and the trigger are elastically connected.

4. The calibration device for ophthalmic imaging equipment according to claim 1, characterized in that: The forehead support includes a top cover, a sliding rod is installed on the upper end of the top cover, the sliding rod is slidably disposed on the upper end of the head support, and a forehead alignment member is installed on the rear side of the upper end of the head support.

5. A calibration device for ophthalmic imaging equipment according to claim 4, characterized in that: The forehead alignment component includes a movable frame, which is fixedly installed on the upper rear side of the head support. The interior of the movable frame is connected to the front end of the arc-shaped component via a pin. A pressing component is installed on the arc-shaped surface of the front end of the arc-shaped component. A pressing component that is used in conjunction with the pressing component is slidably disposed on the upper end of the movable frame.

6. A calibration device for ophthalmic imaging equipment according to claim 4, characterized in that: The linkage mechanism includes a linkage frame, which is connected to the upper end of the sliding rod. The middle part of the linkage frame is connected to the upper middle part of the head support, and an electric push rod is connected to the middle part of the upper end of the head support. Squeezing blocks are symmetrically installed at the left and right ends of the linkage frame. The lower end of the squeezing block has a gradually downward sloping structure from the inside to the outside. Correcting components are symmetrically installed on the inner side of the squeezing block. The spacing between the lower half of the correcting components arranged in the front and back gradually increases from top to bottom.

7. A calibration device for ophthalmic imaging equipment according to claim 6, characterized in that: The calibration mechanism includes a connecting frame, a pressing frame that slides horizontally inside the connecting frame, a rotatable reset rotating component inside the pressing frame, the lower end of the reset rotating component being connected to the expansion panel via a linkage rod, and a fitting component that cooperates with the reset rotating component being slidably disposed in a fixed plate, which is fixedly installed inside the pressing frame.

8. A calibration device for ophthalmic imaging equipment according to claim 7, characterized in that: The upper end of the extrusion frame is provided with an insertion groove, and the straightening component extends into the insertion groove. A rollable drag-reducing roller is provided at the outer corner of the upper end of the extrusion frame, and a spring telescopic rod is connected between the extrusion frame and the connecting frame.

9. A calibration device for ophthalmic imaging equipment according to claim 7, characterized in that: The reset rotating component includes a connecting plate, which is fixedly installed inside the extrusion frame. The connecting plate is connected to the rotating shaft of the T-shaped structure through a bearing. A connecting column is installed at the lower end of the rotating shaft, and the connecting column is connected to the outer end of the linkage rod. A torque spring is connected between the rotating shaft and the connecting plate. A coaxial column is installed at the upper end of the rotating shaft, and a blocking column is coaxially installed at the upper end of the coaxial column. A straightening plate is installed on the outer rear side of the coaxial column. The straightening plate and the straightening component are used in an extrusion fit. The outer wall of the middle part of the coaxial column is provided with an arc-shaped extrusion groove. The extrusion groove is composed of equal-width grooves and narrowing grooves connected clockwise. The width of the narrowing grooves gradually decreases in the clockwise direction. The upper end of the blocking post is provided with a straight groove, and the straight groove is oriented in the same direction as the straight plate. The sliding head corresponding to the position of the straight groove is fixedly installed at the upper end of the connecting frame.

10. A calibration device for ophthalmic imaging equipment according to claim 9, characterized in that: The bonding component includes a bonding plate, the upper end of which is connected to an extrusion rod. The extrusion rod is slidably disposed in a fixed plate, and there is an elastic connection between the extrusion rod and the fixed plate. The outer arc-shaped head of the extrusion rod is in contact with the extrusion groove, and the lower end of the bonding plate is connected to the extrusion frame through an elastic telescopic rod.

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