Trial-wear glasses frame and fitting method

Abstract

The present invention relates to the technical field of eyeglass design, specifically to a trial-wear frame and an adaptation method, comprising a supporting frame for wearing, the supporting frame being provided with a fixing device that uses a magnetic force and an elastic force to fix a trial-wear lens, the fixing device comprising an arc-shaped mounting frame provided on the supporting frame, a receiving groove for accommodating a trial-wear lens being provided on the lower side surface of the mounting frame, a mounting groove being provided on the top of the mounting frame, the mounting groove being connected to the receiving groove, magnets being provided on both end faces of the mounting frame, a fixed iron sheet that cooperates with the magnet being fixedly installed on the supporting frame, a U-shaped spring being fixedly installed in the mounting groove, and the U-shaped opening of the spring facing downward, and both ends of the U-shaped spring having a curved portion that bends outward. The present invention ensures the accuracy of vision measurement results by improving the positional stability of the trial-wear frame during the optometry adaptation process.

Description

Technical Field

[0001] The present invention relates to the technical field of myopia correction glasses, in particular to a trial-wearing glasses frame and an adaptation method. Background Art

[0002] Trial glasses are tools optometrists use to measure a patient's vision during the optometry process. If the optometry process takes a long time, the patient's eyes will gradually adapt to the optometry environment, which can affect the results. To avoid this problem, existing trial glasses often use insert-type lenses. This is because insert-type trial glasses are simple and quick to measure. After the patient puts on the trial frames, they simply replace the trial lenses (i.e., test lenses of different powers used to measure vision) by plugging and unplugging them directly into the frames. This allows the patient's trial lens combination to be quickly changed, allowing optometrists to quickly and accurately determine the patient's vision.

[0003] However, for insert-type trial glasses, during eye examinations, the trial frame, which serves as the carrier for the trial lenses, can easily shift out of its original wearing position due to the pulling action required to remove the trial lenses. This can cause the center of the pupil to misalign with the center of the lens, ultimately leading to inaccurate vision measurements. This is especially true for defocus lenses. Misalignment between the center of the pupil and the center of the trial lens can lead to deviations in the measured defocus value, weakening the defocus lens's effectiveness in controlling myopia. It can even cause patients to experience dizziness, blurred vision, and other discomfort, reducing their desire to wear the glasses and making it even more difficult to control their myopia.

[0004] It is true that the patient can manually push and support the trial frame to reset it, but it is difficult to ensure the consistency of the trial frame with its original position, which may still lead to errors in the measurement results. Summary of the Invention

[0005] The object of the present invention is to provide a trial-wear frame and an adaptation method, so as to improve the position stability of the trial-wear frame during the optometry adaptation process, thereby ensuring the accuracy of vision measurement results.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a trial-fitting frame, comprising a supporting frame for wearing, the supporting frame being provided with a fixing device for fixing a trial-fitting lens by the combined action of magnetic force and elastic force, the fixing device comprising a compensation unit and a shielding unit provided thereon, the compensation unit being used to provide a limit for the supporting frame in an abutting manner during the process of releasing the fixing device, and the shielding unit being used to shield the magnetic force between it and the supporting frame by guiding the magnetic field during the process of releasing the fixing device.

[0007] Based on this technical solution, when installing the trial lens, the present invention can utilize the elastic force of the elastic element of the fixing device to clamp the trial lens on the frame of the fixing device, and then use the magnetic attraction between the fixing device and the supporting frame to limit the trial lens to the supporting frame, thereby realizing simple and quick installation of the trial lens.

[0008] When removing the trial lenses, the fixing device also needs to be removed from the supporting frame. At this time, the offset unit of the present invention can press against the supporting frame to provide it with a reaction force of the same magnitude and opposite to the direction of the magnetic force. Therefore, during the removal of the fixing device, the supporting frame can maintain a state of force balance and will not be pulled by the magnetic force and shift in position, thereby ensuring that the supporting frame can stably maintain its original position without shifting. Therefore, correspondingly, the trial lenses can also be maintained in a stable position, ultimately ensuring the accuracy of the eye examination measurement results.

[0009] It should be noted that since the effect of magnetic force does not require contact between the two components, the supporting frame will continue to be attracted by the magnetic force even after it has been separated from the fixing device, which may cause the supporting frame to still shift in position under the action of the magnetic force. For this reason, a shielding unit is provided. After the shielding unit is provided, when the interaction component used to generate magnetic connection between the fixing device and the supporting frame is separated during the process of removing the trial lens, the shielding unit will be inserted between the two components and guide the magnetic lines of force therebetween, so that the magnetic field is concentrated on the side bounded by the shielding unit, thereby shielding the magnetic force between the two magnetic components. As a result, when the fixing device is removed from the supporting frame, the supporting frame will not be displaced by the magnetic force, thus ensuring that the supporting frame can stably maintain its position.

[0010] Preferably, the fixing device also includes an arc-shaped mounting frame arranged on the supporting frame, a receiving groove for accommodating the trial piece is provided on the lower side of the mounting frame, a mounting groove is provided on the top of the mounting frame, the mounting groove is connected to the receiving groove, magnets are provided on both end faces of the mounting frame, and a fixed iron sheet that cooperates with the magnet is fixedly installed on the supporting frame; a U-shaped spring is fixedly installed in the mounting groove, and the U-shaped opening of the spring faces downward; both ends of the U-shape of the spring have a curved portion curved outward, and two protrusions are symmetrically provided on the inner side surfaces of the two curved portions, and the side surface of each protrusion close to the U-shaped bottom of the spring is parallel to the inner side surface of the adjacent spring.

[0011] Existing trial fitting lenses are provided with outwardly protruding grips on their edges for ease of use. With this solution, when the trial fitting lens is mounted on the fixing device, the U-shaped sidewalls of the spring are squeezed in opposite directions by squeezing the two protrusions, which causes the two protrusions to move away from each other, thereby increasing the space at the opening of the spring and allowing the trial fitting lens to be inserted into the interior of the spring through the opening. When the force of squeezing the spring is removed, the two protrusions return to their positions under the elastic force of the spring and apply lateral force to the grip of the trial fitting lens to clamp the trial fitting lens. At the same time, as the spring returns to its original shape, the bottom end of its U shape also applies a downward squeezing force to the top of the grip of the trial fitting lens, thereby further limiting the freedom of movement of the trial fitting lens, making the trial fitting lens more firmly fixed and more accurately fixed, thereby facilitating the accuracy of the eye examination results. After the above steps, the trial-fitting lens is fixed to the fixing device, and then the fixing device is installed on the supporting frame. The trial-fitting lens can be installed through the magnetic force between the magnet and the fixing patch.

[0012] It should also be noted that the protrusion, as part of the spring, can be manufactured using a variety of methods, including stamping, additive welding, or direct integral molding during the manufacturing process. For the present invention, stamping the protrusion offers significant advantages. On the one hand, current stamping technology is mature and reliable, facilitating standardized, low-cost, and efficient production of springs. Furthermore, compared to the other two manufacturing methods, it requires no additional consumables and does not require consideration of the impact of thermal stress on the overall performance of the spring. On the other hand, springs are often made of metal, and the plastic deformation caused by stamping during the forming process has a cold work hardening effect on the material, increasing the surface hardness of the metal. Consequently, stamped protrusions have excellent wear resistance and surface hardness. This extends the service life of protrusions, which are often subject to compression and friction with the trial lens, thereby ensuring the reliability of the protrusions and their positional retention of the trial lens. This helps ensure that the trial lens is well positioned and relatively fixed, ultimately ensuring the accuracy of the eye measurement results.

[0013] Preferably, the offset unit includes two supporting shafts fixedly mounted on the side walls of the mounting groove, and pinching plates are rotatably mounted on the two supporting shafts, and two wedge blocks that cooperate with each other are respectively provided on the opposite side surfaces of the two pinching plates, and two avoidance recesses for avoiding the mounting bracket are provided on the two pinching plates, and two guide grooves are respectively provided on the two parts of the mounting bracket bounded by the mounting groove, and the two guide grooves are connected to the mounting groove, and elastic rods are installed in the two guide grooves, and the ends of the two elastic rods are respectively fixedly connected to the two magnets, and the other ends of the two elastic rods are respectively connected to the two pinching plates; when the two wedge blocks cooperate with each other, the two pinching plates are staggered and moved to separate the magnet from the fixed iron sheet through the elastic rod; the two outer side surfaces of the spring sheet respectively rest on the wall surfaces of the two pinching plates, and a return spring is respectively sleeved on the two support shafts, and the two ends of the return spring are respectively connected to the mounting bracket and the corresponding avoidance recess.

[0014] The shielding unit includes two receiving grooves opened at both ends of the mounting frame, and the bottom ends of the receiving grooves are connected to the guide grooves. Two L-shaped shielding iron sheets are rotatably installed in each of the receiving grooves. When the two shielding iron sheets cooperate with each other, they overlap with each other at the lower end parts of their L shapes.

[0015] Based on this solution, during the removal of the fixture, by simultaneously applying horizontal compressive forces to the two pinching plates, the two pinching plates can be displaced relative to each other during the engagement of the wedges, while simultaneously not exerting vertical forces on the support frame, thereby facilitating the maintenance of the support frame's position. During the movement of the pinching plates, the elastic rod is pulled, causing the magnet to retract upward into the guide slot. Simultaneously, the mounting bracket abuts the support frame, preventing it from moving upward due to the magnetic force, thereby maintaining the frame's original position. Subsequently, when the magnet moves upward to a position where it no longer obstructs the rotation of the two shielding iron plates, the magnetic force causes the bottom ends of the two L-shaped shielding iron plates to close together, interposing a barrier between the magnet and the corresponding fixing iron plate. At this point, the magnetic force of the magnet is blocked by the shielding iron plates and prevents it from affecting the fixing iron plates, thereby isolating the magnetic connection between the fixture and the support frame. At this point, when the fixture is removed, no force is exerted on the support frame, thereby ensuring that the support frame's position does not shift.

[0016] It's worth noting that the lower ends of the L-shaped shielding iron sheets should partially overlap. This is because relying solely on side contact will inevitably create gaps due to poor contact or material deformation, which will weaken the shielding effect of the shielding iron sheet on the magnetic field. Therefore, a certain arrangement should be made to ensure that the lower ends of the shielding iron sheets overlap to ensure the shielding effect of the shielding iron sheet.

[0017] Preferably, a push block is provided on the part of the elastic rod close to one end of the magnet, the top of the shielding iron sheet is connected to the inner wall of its corresponding storage groove, and each shielding iron sheet is provided with a flange on one end close to the rotating connection point, which cooperates with the push block.

[0018] It should be noted that the strength of the magnetic force is inversely proportional to the distance between the two objects. If the shielding iron sheet is pushed open by a magnet, the friction between the two surfaces will be high, which may cause premature wear of the magnet and the shielding iron sheet, and will also make it more difficult to open the shielding iron sheet. In addition, direct friction will cause the shielding iron sheet to be magnetized quickly by the magnet, making it difficult to maintain its shielding effect. For this reason, a push block and flange are provided.

[0019] When the pinch plate is no longer subject to horizontal extrusion, the elastic rod is reset by the combined action of the reset spring and the leaf spring, thereby pushing the magnet outward until its bottom surface is flush with the end face of the mounting bracket. During this process, the push block presses against the flange and pushes downward to open the two shielding iron sheets, eliminating the need to rely on the magnet to push the shielding iron sheets open. Thus, the arrangement of the push block and flange can reduce friction between the shielding iron sheets and the magnet, thereby extending the service life of the present invention and reducing the difficulty of opening the shielding iron sheets. It also helps prevent the shielding iron sheets from being rapidly magnetized during friction with the magnet, thereby ensuring the shielding effect of the shielding iron sheets.

[0020] In addition, by setting the flange at the part of the shielding iron sheet close to the rotating connection point, the weight of the flange can be used to move the overall center of gravity of the shielding iron sheet upward, thereby shortening the force arm length between the thrust point of the push block on the flange and the center of gravity of the shielding iron sheet, thereby making it easier for the push block to push away the shielding iron sheet, which is beneficial to ensuring the movement stability and reliability of the present invention.

[0021] Preferably, a slide groove is provided at the bottom of the receiving groove to provide movement guidance for the push block. The bottom of the slide groove is connected to the guide groove. The depth of the slide groove is equal to the length of the wedging surface of the wedge block along the length direction of the pinch plate, and the push block never completely leaves the slide groove.

[0022] In the present invention, since the mounting bracket itself is arc-shaped, and the connection between the magnet and the fixed iron sheet requires the end of the elastic rod close to the magnet to bend and deform frequently in the guide groove. Over time, this may cause plastic deformation at this connection point, thereby causing the position of the magnet to change. Accordingly, the movement path of the magnet will also change, thereby reducing the distance between the magnet and the shielding iron sheet in the receiving groove. At this time, even if there are push blocks and flanges, the magnet may be attracted to the shielding iron sheet during movement, which may cause the shielding iron sheet to be magnetized, thereby weakening the shielding effect of the shielding iron sheet. To this end, a slide groove is provided, and the slide groove is used to limit the push block so that the magnet always has a specific movement path, which is conducive to ensuring the correct fit between the magnet and the fixed iron sheet, and the magnet will not be offset due to the bending of the elastic rod, which is conducive to ensuring the reliability of the present invention and the stability of its movement.

[0023] Preferably, both pinching plates are provided with a U-shaped portion, and both side surfaces of the spring are provided with protrusions, which are used to cooperate with the U-shaped portion, thereby providing motion limit for the dislocation movement of the two pinching plates.

[0024] When the two pinching plates are misaligned and moved by pinching, the protrusions of the springs cooperate with the U-shaped portions of the pinching plates to guide their movement. This ensures that the guiding of the pinching plates is not solely the responsibility of the support shaft, but is also supported by the springs. This reduces the load on the support shaft when providing guidance for the pinching plates, thus ensuring their reliability and service life. Furthermore, the support shaft and springs jointly limit the movement of the pinching plates, further ensuring their stability. Furthermore, the outer protrusions of the U-shaped pinching plates help ensure a secure grip, preventing them from slipping.

[0025] Preferably, a limiting groove connected to the guide groove is provided on the side wall surface of the installation groove, and a limiting block is installed on the pinching plate. The limiting block has a columnar portion and a transition portion. The columnar portion cooperates with the limiting groove, and the transition portion is a partially conical shape with the vertex downward. The top of the partially conical shape is fixedly connected to the elastic rod and points to the connection point between the guide groove and the limiting groove.

[0026] When the present invention is used without the pinching plates gripping the two pinching blocks, the columnar portion retracts into the retaining groove, restricting outward rotation of the pinching plates. This prevents the pinching plates from excessively expanding outward when pressed or impacted, thereby preventing excessive tension at the connection point between the elastic rod and the retaining block, which could cause breakage. The transition portion serves to guide the columnar portion back into the retaining groove as the pinching plates return to their original position due to the return spring. Furthermore, the apex of the transition portion's slightly conical shape should point toward the junction of the guide groove and the retaining groove, minimizing bending of the elastic rod at the connection point with the transition portion, thereby preventing fatigue fracture of the elastic rod at this point.

[0027] For the trial-fit frames mentioned in the above technical solution, the adaptation method is as follows:

[0028] S1: Understand the patient's eye history through interviews and use a computer ophthalmometer and keratometer to detect the patient's eye refraction;

[0029] S2: Based on the patient's eye information collected in S1, the patient is given a conventional eyeglass eye exam to determine the refractive power required to correct myopia and astigmatism.

[0030] S3: Correct the patient's central vision to orthocorrection; if the patient's vision is undercorrected or overcorrected, re-examination with ordinary trial lenses is performed until the patient's central vision is corrected to orthocorrection;

[0031] S4: Determine the customized correction power of the patient's central optical zone and adapt a suitable trial lens combination solution, and install the trial lens set on the trial frame;

[0032] S5: Have the patient wear the trial frames equipped with the trial lens set in S4, and obtain the patient's wearing comfort information for the trial lens set by inquiry; if the patient feels comfortable, use the trial defocus amount as the prescription parameter; if the patient feels uncomfortable, start from the largest defocus amount and gradually reduce it to find the highest defocus amount that the patient can bear, and temporarily customize the lens with this defocus amount. After three months, try the lens with a higher defocus level again, and form a customized plan of gradually increasing the defocus amount after the patient adapts.

[0033] Under the premise of adopting the frame of the present invention, the adaptation method is used to avoid the problem of the eye examination results being affected by the position deviation of the trial wearing frame, thereby facilitating the accuracy of the eye examination results.

[0034] In summary, compared with existing trial-fit frames, the advantages of the present invention are mainly reflected in the following aspects:

[0035] 1. Improved positional stability of trial-fit frames during the optometry fitting process, thereby ensuring accurate vision measurement results. To this end, a combination of magnetic attraction and elastic force is employed, with the mounting frame serving as a carrier for trial-fit lenses and securing them to the supporting frame. Abutment ensures that the supporting frame remains in a balanced state of force during lens removal, preventing positional shifting due to applied forces.

[0036] 2. This solves the problem of the continued interaction between the mounting frame and the supporting frame after separation due to the characteristics of magnetic force, thereby further ensuring the positional stability of the trial-fit frames of the present invention. To this end, a magnetic conductive material is used to guide the magnetic field, thereby limiting the magnetic field's range of action to the mounting frame. This prevents the magnetic force from affecting the supporting frame, thus preventing the supporting frame from being subjected to force and shifting in position. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 for Figure 1 Exploded view of;

[0039] Figure 3 is an overall schematic diagram of the fixing device of the present invention and the components mounted thereon;

[0040] Figure 4 for Figure 3 A top view of

[0041] Figure 5 for Figure 4 Enlarged view of part A;

[0042] Figure 6 for Figure 3 Front view of

[0043] Figure 7 for Figure 6 Enlarged view of part B;

[0044] Figure 8 for Figure 6 Enlarged view of part C;

[0045] Figure 9 for Figure 6 Cross-sectional view of the middle DD section;

[0046] Figure 10 for Figure 7 Schematic diagram of the case where the elastic rod is pulled;

[0047] Figure 11 for Figure 8 Schematic diagram of the magnet being retracted and recovered into the nanoslot;

[0048] Figure 12 for Figure 9 Schematic diagram with trial lenses installed;

[0049] Figure 13 This is a flow chart of the adaptation method of the present invention.

[0050] In the figure: 1. Support frame; 2. Fixing device; 3. Compensation unit; 4. Shielding unit; 5. Trial piece; 11. Fixing iron sheet; 21. Mounting frame; 31. Pinch plate; 41. Push block; 42. Slide groove; 43. Shielding iron sheet; 44. Flange; 45. Magnet; 51. Holding part; 211. Accommodating groove; 212. Elastic rod; 213. Limiting groove; 214. Storage groove; 215. Mounting groove; 216. Spring; 217. Guide groove; 311. U-shaped part; 312. Wedge block; 313. Support shaft; 314. Return spring; 315. Avoiding recess; 316. Limiting block; 317. Columnar part; 318. Transition part; 2161. Bump; 2162. Protrusion. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0052] like Figures 1 to 13 It should be noted that, since the optometry process for both eyes is exactly the same, in order to save space, the following content only describes the adaptation process for the patient's right eye, and does not elaborate on the adaptation process for the left eye.

[0053] The trial-wear frame in this embodiment can meet the adjustment of any pupil distance and pupil height, and the ring shape of the matching trial-wear lenses 5 is designed to be 38mm~45mm. The trial-wear lens group in this embodiment is provided with lenses of different defocus amounts: ADD+1.00D, ADD+2.00D, ADD+2.50D, ADD+3.00D, ADDD+3.50, ADD+4.00D, and the trial-wear defocus lenses are divided into left and right eyes. The spherical power DS=0.00D of the defocus lenses of the trial-wear lens group is used in combination with ordinary single-focus frame trial lenses. In addition, combined with the overall volume of the trial-wear frame, the elastic rod 212 adopts a copper wire with a diameter of 2mm, and the copper wire can avoid interference with the magnet 45 due to magnetic force.

[0054] The specific fitting process is as follows: First, understand the patient's eye history through interviews, and use a computer ophthalmometer and a keratometer to detect and collect the patient's eye information to confirm the refractive condition of the eye. The naked eye refractive state of the patient's right eye is measured to be: -2.00DS / -2.50DC×180°, and the defocus amount is ADD+3.00D; then, based on this information, the patient is given a conventional frame glasses eye test to determine the refractive power of the correction of myopia and astigmatism. When the patient's central vision is corrected to the orthostatic state, two ordinary trial lenses can be determined for trial wearing, one of which is a conventional spherical trial lens of -2.00D, and the other is a conventional cylindrical trial lens of -2.5D; then according to After the patient's defocus amount is determined, a defocus trial lens with ADD+3.00D is selected, thus confirming a set of trial lens combination plans; thereafter, the three lenses are respectively installed on the part of the supporting frame 1 corresponding to the right eye, and a light-shielding lens is installed on the left eye part, and then the patient is given to try on, and the patient is asked to look at a stationary object and shake his head, and asked whether he feels that the object moves with it, and whether he has other physical discomfort (such as dizziness, nausea). If the patient feels that the object moves with the shaking of his head, or has dizziness, it means that the defocus amount affects the comfort level, and a smaller defocus lens needs to be selected for trial wearing. If the patient feels comfortable, the trial defocus amount is used as the prescription glasses parameter.

[0055] In addition, if the patient feels uncomfortable, the defocus amount in the trial lens combination plan is gradually adjusted according to the order of defocus amount from large to small, and the highest defocus amount that the patient can bear is found. The lens with this defocus amount is temporarily customized based on this defocus amount. After three months, the patient is re-tried with a higher defocus lens, and a customized plan is formed in which the defocus amount is gradually increased after the patient adapts to the lens, and finally the customized plan that best suits the patient is obtained.

[0056] In the above content, the specific process of installing the trial piece 5 on the trial frame is as follows: first, pinch the two pinching plates 31 to cause the spring 216 to deform inward, so that the two protrusions 2161 on it rotate to avoid, so that the U-shaped opening part of the spring 216 shows a larger passing area. At this time, the trial piece 5 is inserted into the mounting frame 21 from bottom to top and falls into the accommodating groove 211. At the same time, the pinching portion 51 of the trial piece 5 is extended into the mounting groove 215 and rests on the U-shaped bottom of the spring 216. Then, the force of pinching the two pinching plates 31 is removed, and the deformation of the spring 216 is restored. Then, the trial piece 5 is fixed by the clamping action of the two protrusions 2161 and the pushing action of the spring 216 itself on the pinching portion 51 of the trial piece 5. Then the mounting frame 21 with the trial-fitting lens 5 fixed thereon is placed on the supporting frame 1 , and the magnet 45 on the mounting frame 21 is attracted to the fixed iron sheet 11 on the supporting frame 1 so that the trial-fitting lens 5 is mounted on the supporting frame 1 .

[0057] In addition, in the process of replacing the trial piece 5 on the trial frame, the specific operating steps are as follows: first, pinch the two pinching plates 31 to deform the spring 216 until the two wedge blocks 312 are fully engaged. At this time, the side wall surface of the spring 216 also presses against the side wall surface of the pinching portion 51 of the trial piece 5, so that the fingers cannot continue to pinch. In addition, the side wall surface of the trial piece 5 is no longer squeezed by the protrusion 2161, but is instead subjected to the friction force of the side wall surface of the spring 216, so that the trial piece 5 will not fall off the mounting frame 21; at the same time, the cooperation between the U-shaped portion 311 of the pinching plate 31 and the protrusion 2162 of the spring 216, combined with the action of the support shaft 313, causes the two pinching plates 31 to be displaced in opposite directions along the axial direction of the support shaft 313, so that the limit block 316 pulls the elastic rod 212 to retract the magnet 45 into the receiving groove 214 At this time, the end of the mounting frame 21 is still against the supporting frame 1, so the attraction between the magnet 45 and the fixed iron sheet 11 is offset by the action force between the mounting frame 21 and the supporting frame 1, so that the supporting frame 1 can maintain its original position without deviation; then, as the push block 41 rises, the two shielding iron sheets 43 are gradually attracted by the magnet 45 and close inward, eventually forming a shell that covers the magnet 45, thereby shielding the attraction of the magnet 45 to the fixed iron sheet 11. At this time, removing the mounting frame 21 from the supporting frame 1 will not generate additional thrust or pull on the supporting frame 1, so that the supporting frame 1 can be stabilized in its position; finally, for the removed mounting frame 21, reduce the force of pinching the pinching plate 31 to reduce the friction between the side of the spring sheet 216 and the trial piece 5, and then pull the trial piece 5 downward to remove the trial piece 5 from the present invention.

[0058] The resetting process of the shielding unit 4 of the present invention is as follows: after the pinching plate 31 is released, the pinching plate 31 is stretched open and slides back to its initial position along its corresponding support shaft 313 under the elastic force of the return spring 314 and the reed 216. Accordingly, the elastic rod 212 pushes the magnet 45 toward the lower end opening of the receiving slot 214. During this process, the push block 41 first abuts against the flange 44 on the shielding iron sheet 43 before the magnet 45 contacts the shielding iron sheet 43, thereby leveraging the elastic force of the return spring 314 and the reed 216 to stretch the shielding iron sheet 43 open. The push block 41 then continuously limits the shielding iron sheet 43 during the subsequent stroke, so that the shielding iron sheet 43 no longer hinders the movement of the magnet 45. Finally, the magnet 45 extends outward until its bottom surface is flush with the end surface of the mounting bracket 21, completing the resetting process.

[0059] The trial-fit glasses frame of the present invention does not shift in position during use, the fixed state of the trial-fit lens 5 is stable, and the trial-fit lens 5 does not become loose during the fitting process. The three lenses in the same trial-fit lens combination do not shift in focus during the patient's trial wearing process.

[0060] It should be emphasized that, based on the contents described above, although the beneficial effects of the present invention have been elaborated in detail and corresponding specific implementation methods have been provided, those skilled in the art can still achieve the same technical effects by making conventional substitutions, modifications, and other changes based on the given technical solutions without inventive effort, provided that they fully understand the working principles of the present invention. However, such changes should not be considered as exceeding the scope of the present invention. Specifically, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A trial-fit spectacles frame, comprising a supporting frame (1) for wearing, characterized in that: The supporting frame (1) is provided with a fixing device (2) for fixing the trial lens by the combined action of magnetic force and elastic force, the fixing device (2) comprises an arc-shaped mounting frame (21) provided on the supporting frame (1), a receiving groove (211) for receiving the trial lens is provided on the lower side of the mounting frame (21), a mounting groove (215) is provided on the top of the mounting frame (21), the mounting groove (215) is communicated with the receiving groove (211), magnets (45) are provided on both end faces of the mounting frame (21), a fixing iron sheet (11) that cooperates with the magnet (45) is fixedly installed on the supporting frame (1); a U-shaped spring sheet (216) is fixedly installed in the mounting groove (215), and The U-shaped opening of the reed (216) faces downward; both ends of the U-shape of the reed (216) have outwardly curved portions, and two protrusions (2161) are symmetrically provided on the inner side surfaces of the two curved portions, and a side surface of each protrusion (2161) close to the U-shaped bottom of the reed (216) is parallel to the inner side surface of the adjacent reed (216); the mounting frame (21) and the mounting groove (215) are jointly provided with a compensation unit (3) for providing a limit for the supporting mirror frame (1) in an abutting manner during the process of releasing the fixing device (2), and the mounting frame (21) is provided with a shielding unit (4) for shielding the magnetic force between the fixing device (2) and the supporting mirror frame (1) during the process of releasing the fixing device (2).

2. The trial-fit eyeglass frame according to claim 1, characterized in that: The offset unit (3) comprises two support shafts (313) fixedly mounted on the side wall of the mounting groove (215), a pinching plate (31) is rotatably mounted on each of the two support shafts (313), two mutually cooperating wedges (312) are respectively provided on the opposite side surfaces of the two pinching plates (31), two avoidance recesses (315) for avoiding the mounting frame (21) are respectively provided on the two pinching plates (31), two guide grooves (217) are respectively provided on the two parts of the mounting frame (21) bounded by the mounting groove (215), and both guide grooves (217) are communicated with the mounting groove (215), and elastic rods ( 212), the ends of the two elastic rods (212) are fixedly connected to the two magnets (45), and the other ends of the two elastic rods (212) are connected to the two pinching plates (31). When the two wedge blocks (312) cooperate with each other, the two pinching plates (31) are dislocated and moved to separate the magnets (45) from the fixed iron sheet (11) through the elastic rods (212). The two outer side surfaces of the spring sheet (216) are respectively against the wall surfaces of the two pinching plates (31). The two support shafts (313) are both provided with a return spring (314). The two ends of the return spring (314) are respectively connected to the mounting frame (21) and the corresponding avoidance recess (315).

3. The trial-fit eyeglass frame according to claim 2, wherein: The shielding unit (4) comprises two receiving grooves (214) provided at both ends of the mounting frame (21), and the bottom ends of the receiving grooves (214) are connected to the guide grooves (217). Two L-shaped shielding iron sheets (43) are rotatably mounted in each of the receiving grooves (214). When the two shielding iron sheets (43) cooperate with each other, the lower end portions of the L-shapes overlap with each other.

4. The trial-fit eyeglass frame according to claim 3, wherein: A push block (41) is provided on the portion of the elastic rod (212) close to one end of the magnet (45), the top of the shielding iron sheet (43) is connected to the inner side wall of the corresponding receiving groove (214), and a flange (44) that cooperates with the push block (41) is provided on one end of each shielding iron sheet (43) close to the rotation connection point.

5. The trial-fit spectacles frame according to claim 2, wherein: The two pinching plates (31) are both provided with a U-shaped portion (311), and both side surfaces of the spring (216) are provided with protrusions (2162) that cooperate with the U-shaped portion (311) to provide motion limits for the dislocation movement of the two pinching plates (31).

6. The trial-fit eyeglass frame according to claim 2, characterized in that: A limiting groove (213) communicating with the guide groove (217) is provided on the side wall surface of the installation groove (215); a limiting block (316) is installed on the pinching plate (31); the limiting block (316) comprises a columnar portion (317) and a transition portion (318); the columnar portion (317) cooperates with the limiting groove (213); the transition portion (318) is in the shape of a partial cone with its vertex at the bottom; the top end of the partial cone is fixedly connected to the elastic rod (212) and points to the connection point between the guide groove (217) and the limiting groove (213).

7. The trial-fit eyeglass frame according to claim 4, characterized in that: The bottom end of the receiving groove (214) is provided with a slide groove (42) for providing a movement guide for the push block (41). The bottom end of the slide groove (42) is connected to the guide groove (217). The depth of the slide groove (42) is equal to the length of the wedging surface of the wedge block (312) along the length direction of the pinching plate (31). The push block (41) never completely leaves the slide groove (42).

8. The trial-fit eyeglass frame according to claim 1, characterized in that: The protrusion (2161) is directly formed on the spring leaf (216) by stamping.

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