A pickup device dedicated to an optical disc

Abstract

This application proposes a gripping device specifically for optical discs, comprising: a base having a through-hole portion, the side of which has a clearance groove; a gripper arm having a magnetic end and a limiting end, the middle portion of which is hinged to the base, the magnetic end passing through the base, and the limiting end placed in the clearance groove; and a magnetic component disposed in the base for generating a first magnetic force and a second magnetic force acting on the magnetic end; the first magnetic force can drive the magnetic end to swing toward the magnetic component and drive the limiting end to swing outward to move outside the clearance groove; the second magnetic force can drive the magnetic end to swing away from the magnetic component and drive the limiting end to swing inward to return to the clearance groove; wherein the magnetic component continuously generates the first magnetic force and can be turned on and off to generate the second magnetic force, so as to dominate and control the magnetic poles of the magnetic component when generating the second magnetic force; thus solving the technical problem that existing magnetic grippers immediately lose their gripping function after the external power source is accidentally cut off.

Description

Technical Field

[0001] This application relates to the technical field of gripping devices, and more particularly to a gripping device specifically for optical discs. Background Technology

[0002] In the field of data storage technology, optical disc drives, as important information reading and writing devices, rely heavily on their internal optical disc gripping and positioning mechanisms to ensure stable data reading. Traditionally, mechanical grippers have been widely used for gripping and securing optical discs. These grippers are typically made of metal or high-strength plastic and operate via a motor-driven mechanical transmission structure such as gears, linkages, or cams to clamp or release the disc's center hole. However, this purely mechanical transmission method has significant drawbacks in long-term operation: continuous physical contact and relative movement between the various transmission components lead to excessive friction on the contact surfaces. This not only causes mechanical wear and reduces the lifespan of the grippers but may also generate tiny particles that contaminate the disc surface, affecting read / write performance. Furthermore, energy loss due to friction reduces the overall system efficiency and may cause a decrease in positioning accuracy due to component loosening or deformation, affecting the stability and reliability of the optical disc drive.

[0003] To overcome the friction problems associated with purely mechanical transmission, existing technologies have developed gripper structures based on magnetic force transmission, namely magnetic grippers. This technology utilizes the principle of magnetic coupling, using the magnetic field generated by an electromagnet or permanent magnet at the drive end to non-contactly drive the magnetic components at the gripper end to perform opening and closing movements. Since magnetic transmission eliminates the need for direct mechanical connections, it effectively avoids the frictional losses caused by contact in traditional gear or linkage mechanisms, significantly reducing mechanical wear and particulate contamination, and improving transmission efficiency and system lifespan. Simultaneously, magnetic grippers offer fast response speeds and high control precision, contributing to improved stability and speed of optical disc loading. They have already been applied in some high-end optical storage devices, becoming an important technological direction for replacing traditional mechanical grippers.

[0004] However, existing magnetic gripper technology still has inherent flaws. Most magnetic grippers operate based on electromagnets, requiring a continuous conversion of electrical energy into magnetic energy to maintain gripping force. In the event of a circuit failure, short circuit, or external power outage, the electromagnet will immediately lose its magnetism, causing the gripper to be unable to continue holding the disc, which will then accidentally fall off due to gravity or centrifugal force. This sudden failure can not only cause scratches and damage to the disc, but more seriously, it can result in the complete loss of data on the disc, leading to irreversible information loss. Therefore, existing magnetic grippers still have significant shortcomings in terms of reliability and safety, and there is an urgent need for an improved solution that can maintain basic gripping function even in the event of a power outage or malfunction. Utility Model Content

[0005] This application provides a dedicated optical disc gripping device to solve the technical problem that existing magnetic grippers immediately lose their gripping function after an accidental cutoff of external power. The technical solution is as follows:

[0006] This application provides a gripping device for optical discs, comprising: a base having a through-hole for inserting into the center hole of an optical disc, the through-hole having a clearance groove on its side; a gripper arm having a magnetic end and a limiting end, the middle part of the gripper arm being hinged to the base such that the magnetic end and the limiting end form a lever structure that can swing in opposite directions, the magnetic end being inserted into the base and the limiting end being placed in the clearance groove; and a magnetic component disposed in the base for generating a first magnetic force and a second magnetic force acting on the magnetic end; the first magnetic force can drive the magnetic end to swing toward the magnetic component and drive the limiting end to swing outward to move outside the clearance groove; the second magnetic force can drive the magnetic end to swing away from the magnetic component and drive the limiting end to swing inward to return to the clearance groove.

[0007] The magnetic component continuously generates a first magnetic force and can generate a second magnetic force in a turn-on or turn-off manner, so as to dominate and regulate the magnetic poles of the magnetic component when generating the second magnetic force.

[0008] In one embodiment, the magnetic component includes: a magnetic core having an input end and an output end facing the magnetic end; a permanent magnet disposed at the input end of the magnetic core for providing a first magnetic force to the magnetic core; and an electromagnetic coil wound around the magnetic core for providing a second magnetic force to the magnetic core when energized.

[0009] In one embodiment, the base includes: a housing having a receiving chamber and an end opening; and a mounting post having a mounting base and a through-hole, the mounting base being embedded and fixed in the receiving chamber, and the through-hole extending out of the end opening and exposed at one end of the housing for inserting into the center hole of the optical disc.

[0010] In one embodiment, the mounting base has a mounting cavity inside, a relief groove is located on the side wall of the through part, and the mounting cavity is connected to the relief groove; the gripper arm is rotatably mounted on the inner wall of the mounting cavity via a hinge shaft, the magnetic end is located in the mounting cavity and can swing in the mounting cavity, and the limiting end extends to the relief groove.

[0011] In one embodiment, there are three gripper arms, arranged circumferentially along the mounting post; the mounting cavity and the clearance groove correspond to three gripper arms for each gripper arm.

[0012] In one embodiment, the output end of the magnetic core extends in the receiving chamber to the center of the mounting base and is equidistant from the magnetic ends of each gripper arm.

[0013] In one embodiment, a limiting head is provided on the limiting end, the size of the limiting head being larger than the size of the limiting end, so as to form an abutment surface on the side of the limiting head near the limiting end, the abutment surface being used to abut against the lower surface of the optical disc when the limiting end moves out of the clearance groove.

[0014] In one embodiment, the housing is configured as a cylindrical structure, and the size of the opening at the upper end of the housing is smaller than the inner diameter of the receiving chamber.

[0015] In one embodiment, the size of the mounting base is larger than the size of the opening at the upper end of the housing and smaller than the inner diameter of the receiving chamber; the size of the through-hole is smaller than the end opening of the housing and is configured as a cylindrical structure that can be adapted to the center hole of the optical disc, with a clearance groove formed on the radial side of the through-hole.

[0016] Compared with existing technologies, the optical disc gripping device proposed in the above technical solution can continuously generate a first magnetic force to attract the magnetic end of the gripper arm, and selectively generate a second magnetic force to repel the magnetic end. Under normal operating conditions, when gripping is not required or when releasing the optical disc, the second magnetic force is activated, causing it to dominate the magnetic poles of the magnetic component. The magnetic component repels the magnetic end, driving the limiting end to retract into the clearance groove, allowing the insertion part to pass through the optical disc's center hole or release the optical disc. When gripping and securing the optical disc is required, the second magnetic force is deactivated. At this time, the continuously existing first magnetic force automatically dominates the magnetic poles of the magnetic component, attracting the magnetic end and driving the limiting end to swing outward and engage with the outer edge of the optical disc's center hole, achieving automatic gripping and locking. Most importantly, this design makes the outward engagement of the limiting end the "default" state. The outstanding safety advantage of this design lies in the fact that when an external power outage, short circuit, or other malfunction causing power supply failure occurs, the closable second magnetic force will disappear, while the fundamental, continuously existing first magnetic force remains unaffected and continues to maintain its attractive force on the magnetic end. Therefore, the limiting end of the gripper arm will remain in the gripping position outside the clearance slot, firmly holding the outer edge of the optical disc's center hole. This prevents the magnetic force from disappearing instantly due to power failure and the optical disc from accidentally falling, fundamentally avoiding irreversible losses such as optical disc scratches and data loss, and greatly improving data security.

[0017] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0018] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0019] Figure 1 This is a schematic diagram of the internal structure of the optical disc gripping device in this embodiment of the application, in which the first magnetic force dominates the magnetic force component;

[0020] Figure 2 This is a schematic diagram of the internal structure of the optical disc gripping device, which is dominated by a second magnetic force in the magnetic force component, according to an embodiment of this application.

[0021] Figure label:

[0022] 1. Base;

[0023] 11. Housing; 12. Mounting post;

[0024] 111. Receiving chamber; 121. Mounting base; 122. Through-hole; 123. Mounting cavity; 124. Relief groove;

[0025] 2. Gripper arm;

[0026] 21. Magnetic end; 22. Limiting end; 23. Limiting head;

[0027] 3. Hinge shaft;

[0028] 4. Magnetic components;

[0029] 41. Magnetic core; 42. Permanent magnet; 43. Electromagnetic coil. Detailed Implementation

[0030] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0031] Reference Figure 1 and Figure 2As shown, an embodiment of this application proposes a gripping device specifically for optical discs. This gripping device may include: a base 1 with a through-hole 122 for inserting into the center hole of the optical disc, the through-hole 122 having a clearance groove 124 on its side; and a gripper arm 2 having a magnetic end 21 and a limiting end 22. The middle portion of the gripper arm 2 is hinged to the base 1, such that the magnetic end 21 and the limiting end 22 form a lever structure that can swing in opposite directions. The magnetic end 21 is inserted into the base 1. The limiting end 22 is placed in the relief groove 124; and the magnetic component 4 is disposed in the base 1 to generate a first magnetic force and a second magnetic force acting on the magnetic end 21; the first magnetic force can drive the magnetic end 21 to swing in the direction close to the magnetic component 4, and drive the limiting end 22 to swing outward to move to the outside of the relief groove 124; the second magnetic force can drive the magnetic end 21 to swing in the direction away from the magnetic component 4, and drive the limiting end 22 to swing inward to return to the relief groove 124;

[0032] The magnetic component 4 continuously generates a first magnetic force and can generate a second magnetic force in a turn-on / off manner, so as to dominate and regulate the magnetic poles of the magnetic component 4 when generating the second magnetic force.

[0033] Specifically, in the technical solution adopted in this application, the base 1 has a through-hole 122 that can pass through the center hole of the optical disc, and a clearance groove 124 is provided on the through-hole 122; the middle position of the gripper arm 2 is hinged to the base 1, so that the two ends of the gripper arm 2 can swing around the middle part to form a lever structure. The two ends of the gripper arm 2 are a magnetic end 21 that passes through the base 1 and a limiting end 22 that is placed in the clearance groove 124, respectively. The magnetic end 21 can be driven to swing and drive the limiting end 22 to move in the clearance groove 124. When the limiting end 22 returns to the clearance groove 124, the through-hole 122 can smoothly pass through the center hole of the optical disc, and when the limiting end 22 moves to the outside of the clearance groove 124 by swinging, the through-hole 122 can be used to lock and fix the optical disc through the limiting end 22 to achieve the gripping of the optical disc. The key technical point of this application is that a magnetic component 4 capable of coupling with the magnetic end 21 is provided in the base 1. This magnetic component 4 can generate a first magnetic force and a second magnetic force acting on the magnetic end 21. The first magnetic force and the magnetic end 21 are opposite magnetic poles. When the magnetic pole on the magnetic component 4 is dominated by the first magnetic force, the magnetic component 4 can attract the magnetic end 21. At this time, the limiting end 22 swings outward from the base 1 around the center position of the gripper arm 2 until it moves to the outside of the clearance groove 124. When the through part 122 passes through the center hole of the optical disc, the limiting end 22 can hold the optical disc. It is connected to the through part 122; and the second magnetic force and the magnetic end 21 are of the same magnetic pole. When the magnetic pole on the magnetic force assembly 4 is dominated by the second magnetic force, the magnetic force assembly 4 can repel the magnetic end 21. At this time, the limiting end 22 swings from the outside of the relief groove 124 to the relief groove 124 around the center position of the gripper arm 2, so that the through part 122 can smoothly pass into the center hole of the optical disc. When the through part 122 has passed into the center hole of the optical disc, the limiting end 22 returns to the relief groove 124 and can also release the restriction on the optical disc, so that the optical disc can smoothly slide out of the through part 122. It should be noted that the magnetic component 4 in this application can continuously generate a first magnetic force, while selectively or closably generating a second magnetic force. When no second magnetic force is generated in the magnetic component 4, the first magnetic force dominates the magnetic poles of the magnetic component 4. This ensures that, under normal conditions, the limiting end 22 of the gripping device is outside the clearance groove 124, maintaining a state where the optical disc can be gripped. When the second magnetic force is generated in the magnetic component 4, since the second magnetic force is greater than the first magnetic force, the magnetic force of the magnetic component 4 is dominated by the second magnetic force. This causes the magnetic force on the magnetic component 4 to switch, establishing a repulsive magnetic relationship with the magnetic force at the magnetic end 21, thereby driving the limiting end 22 back into the clearance groove 124. This allows the through-hole 122 to smoothly penetrate the center hole of the optical disc or release the optical disc. By using the optical disc gripping device of this application, irreversible damage caused by accidental optical disc detachment due to gripping function failure caused by malfunction is effectively avoided.It can also replace part of the mechanical transmission through magnetic drive, avoiding some of the mechanical friction loss and extending service life.

[0034] Furthermore, refer to Figure 1 and Figure 2 As shown, in some embodiments, the magnetic component 4 includes: a magnetic core 41 having an input end and an output end facing the magnetic end 21; a permanent magnet 42 disposed at the input end of the magnetic core 41 for providing a first magnetic force to the magnetic core 41; and an electromagnetic coil 43 wrapped around the magnetic core 41 for providing a second magnetic force to the magnetic core 41 when energized.

[0035] Specifically, in the technical solution adopted in this application, in order to enable the magnetic component 4 to continuously generate a first magnetic force and selectively generate a second magnetic force, the magnetic component 4 may include: a magnetic core 41, a permanent magnet 42, and an electromagnetic coil 43; the magnetic core 41 may be made of a magnetic material, for example, an iron core, and has an input end and an output end. The permanent magnet 42 is connected to the input end, while the output end faces the magnetic end 21, so that the first magnetic force generated by the permanent magnet 42 is conducted from the input end to the output end through the magnetic core 41, and finally acts on the magnetic end 21 through the output end; while the electromagnetic coil 43 is wrapped around the magnetic core 41. When the electromagnetic coil 43 is energized, it can generate a magnetic field and generate a second magnetic force. After the second magnetic force is introduced into the magnetic core 41, it also acts on the magnetic end 21 through the output end. In use, the electromagnetic coil 43 can be selectively powered on, thereby enabling the second magnetic force on the magnetic component 4 to be turned on and off, so as to control the swing direction of the magnetic end 21 and the limiting end 22.

[0036] Furthermore, refer to Figure 1 and Figure 2 As shown, in some embodiments, the base 1 includes: a housing 11 having a receiving chamber 111 and an end opening; and a mounting post 12 having a mounting base 121 and a through portion 122, wherein the mounting base 121 is embedded and fixed in the receiving chamber 111, and the through portion 122 extends out to the end opening exposed at one end of the housing 11 for inserting into the center hole of the optical disc.

[0037] Specifically, in the technical solution adopted in this application, the base 1 can be composed of a housing 11 and a mounting post 12 disposed in the housing 11. The housing 11 has a receiving chamber 111 and an end opening, and the magnetic assembly 4 is installed in the receiving chamber 111. The mounting post 12 has a mounting seat 121 and a through-hole 122 connected to the mounting seat 121. The mounting seat 121 is embedded and fixed in the receiving chamber 111 through the end opening of the housing 11, and the through-hole 122 extends to one end of the housing 11 through the end opening of the housing 11, so as to realize that it can be inserted into the center hole of the optical disc through the through-hole 122.

[0038] Furthermore, refer to Figure 1 and Figure 2 As shown, in some embodiments, the mounting base 121 has a mounting cavity 123 inside, the relief groove 124 is located on the side wall of the through part 122, and the mounting cavity 123 is connected to the relief groove 124; the gripper arm 2 is rotatably mounted on the inner wall of the mounting cavity 123 via the hinge shaft 3, the magnetic end 21 is located in the mounting cavity 123 and can swing in the mounting cavity 123, and the limiting end 22 extends to the relief groove 124.

[0039] Specifically, in the technical solution adopted in this application, in order to facilitate the configuration of the gripper arm 2 on the base 1, the mounting base 121 has a mounting cavity 123 inside. The gripper arm 2 is rotatably mounted on the inner wall of the mounting cavity 123 through the hinge shaft 3, and the magnetic end 21 is located in the mounting cavity 123. The space of the mounting cavity 123 can support the magnetic end 21 to swing inside it. The clearance groove 124 is opened on the side wall of the through part 122 and communicates with the mounting cavity 123. The limiting end 22 extends into the clearance groove 124 and can swing outward based on the clearance groove 124.

[0040] Furthermore, refer to Figure 1 and Figure 2 As shown, in some embodiments, the number of gripper arms 2 is three, and they are arranged circumferentially along the mounting post 12; the mounting cavity 123 and the relief groove 124 correspond to each gripper arm 2 being three.

[0041] In some embodiments, the output end of the magnetic core 41 extends in the receiving chamber 111 to the center of the mounting base 121 and is equidistant from the magnetic ends 21 of each gripper arm 2.

[0042] Specifically, in the technical solution adopted in this application, in order to achieve a smoother gripping of the optical disc through the center hole, the mounting base 121 has three mounting cavities 123 inside, and the mounting post 12 has three clearance grooves 124 on its side, so that three gripper arms 2 can be configured on the base 1. The magnetic core 41 in the magnetic assembly 4 is located in the middle of the mounting base 121 based on the three mounting cavities 123, so that the first magnetic force and the second magnetic force on the magnetic core 41 can simultaneously drive the magnetic ends 21 in the three mounting cavities 123 to swing. Specifically, when the magnetic core 41 forms opposite magnetic poles based on the magnetic ends 21 under the dominance of the first magnetic force, the output end of the magnetic core 41 can attract the magnetic ends 21 in the three mounting cavities 123; while when the magnetic core 41 forms like magnetic poles based on the magnetic ends 21 under the dominance of the second magnetic force, the output end of the magnetic core 41 can repel the magnetic ends 21 in the three mounting cavities 123.

[0043] Furthermore, refer to Figure 1 and Figure 2As shown, in some embodiments, the limiting end 22 is provided with a limiting head, and the size of the limiting head 23 is larger than the size of the limiting end 22, so that an abutting surface is formed on the side of the limiting head 23 near the limiting end 22. The abutting surface is used to abut against the lower surface of the optical disc when the limiting end 22 is moved outside the clearance groove 124.

[0044] Specifically, in the technical solution adopted in this application, in order to make the limiting end 22 more stably hold the optical disc, a limiting head 23 can also be provided on the limiting end 22. Since the size of the limiting head 23 is larger than the size of the limiting end 22, when the limiting end 22 moves to the outer support center hole of the optical disc in the relief groove 124, the abutting surface of the limiting head 23 near the limiting end 22 can abut against the lower surface of the optical disc, thereby lifting the optical disc and avoiding the optical disc slipping due to insufficient support force generated by the first magnetic force on the limiting end 22.

[0045] Furthermore, refer to Figure 1 and Figure 2 As shown, in some embodiments, the housing 11 is configured as a cylindrical structure, and the size of the opening at the upper end of the housing 11 is smaller than the inner diameter of the receiving chamber 111.

[0046] Specifically, in the technical solution adopted in this application, the housing 11 can be provided with a cylindrical structure, and the size of the opening at the upper end of the housing 11 is smaller than the inner diameter of the receiving chamber 111, so as to form a limiting structure through the inner wall of the housing 11, thereby facilitating the installation column 12 to be embedded and fixed in the receiving chamber 111 through the end opening of the housing 11.

[0047] Furthermore, refer to Figure 1 and Figure 2 As shown, in some embodiments, the size of the mounting base 121 is larger than the end opening of the housing 11 and smaller than the inner diameter of the receiving chamber 111; the size of the through portion 122 is smaller than the end opening of the housing 11 and is configured as a cylindrical structure that can be adapted to the center hole of the optical disc, with the clearance groove 124 opened on the radial side of the through portion 122.

[0048] Specifically, in the technical solution adopted in this application, in order to adapt to the inner wall of the housing 11 to form a limiting structure, the size of the mounting base 121 can be set to be larger than the size of the opening at the upper end of the housing 11 and smaller than the inner diameter of the receiving chamber 111, so that the mounting base 121 can be confined in the receiving chamber 111; and in order for the through part 122 to be exposed at one end of the housing 11, the through part 122 can be provided with a cylindrical structure, the diameter of which is smaller than the size of the opening at the upper end of the housing 11, so as to connect to the mounting base 121. The through portion 122 of the base 121 can protrude through the end opening of the housing 11 and be exposed on one end of the housing 11. Since the diameter of the through portion 122 needs to be smaller than the diameter of the center hole of the optical disc, in this embodiment, the relief groove 124 can be opened on the radial side of the through portion 122. Thus, when the limiting end 22 is hidden in the relief groove 124, the through portion 122 can be inserted into the center hole of the optical disc. When the limiting end 22 is moved outside the relief groove 124, it can be supported on the optical disc to achieve the purpose of gripping the optical disc.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process. Furthermore, the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functionality involved.

[0052] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus or device (such as a computer-based system, a processor-included system or other system that can fetch and execute instructions from, an instruction execution system, apparatus or device).

[0053] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. All or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware, the program being stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiments.

[0054] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. This storage medium can be a read-only memory, a disk, or an optical disk, etc.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dedicated optical disc gripping device, characterized in that, include: The base is provided with a through-hole for inserting into the center hole of the optical disc, and a clearance groove is provided on the side of the through-hole; The gripper arm has a magnetic end and a limiting end. The middle part of the gripper arm is hinged to the base, so that the magnetic end and the limiting end form a lever structure that can swing in opposite directions. The magnetic end passes through the base, and the limiting end is placed in the relief groove. as well as, A magnetic component, disposed in the base, is used to generate a first magnetic force and a second magnetic force acting on the magnetic end; The first magnetic force can drive the magnetic end to swing toward the direction of the magnetic component, and drive the limiting end to swing outward to move outside the clearance groove; The second magnetic force can drive the magnetic end to swing away from the magnetic component, and drive the limiting end to swing inward to return to the clearance groove; The magnetic component continuously generates the first magnetic force and can be turned on and off to generate the second magnetic force, so as to dominate and regulate the magnetic poles of the magnetic component when generating the second magnetic force.

2. The optical disc gripping device according to claim 1, characterized in that, The magnetic component includes: A magnetic core having an input end and an output end facing the magnetic force end; A permanent magnet is disposed at the input end of the magnetic core and is used to provide the first magnetic force to the magnetic core; An electromagnetic coil, wound around the magnetic core, is used to provide the second magnetic force to the magnetic core when energized.

3. The optical disc gripping device according to claim 2, characterized in that, The base includes: The housing has a receiving chamber and an end opening; The mounting post has a mounting base and the through-hole portion. The mounting base is embedded and fixed in the receiving cavity, and the through-hole portion extends out of the end opening and is exposed at one end of the housing for insertion into the center hole of the optical disc.

4. The optical disc gripping device according to claim 3, characterized in that, The mounting base has an internal mounting cavity, the clearance groove is located on the side wall of the through part, and the mounting cavity is connected to the clearance groove; The gripper arm is rotatably mounted on the inner wall of the mounting cavity via a hinge shaft, the magnetic end is located inside the mounting cavity and can swing within the mounting cavity, and the limiting end extends to the relief groove.

5. The optical disc gripping device according to claim 4, characterized in that, The number of gripper arms is three, and they are arranged circumferentially along the mounting post; The mounting cavity and the relief groove correspond to each of the three gripper arms.

6. The optical disc gripping device according to claim 5, characterized in that, The output end of the magnetic core extends in the receiving chamber to the center of the mounting base and is equidistant from the magnetic ends of each of the gripper arms.

7. A gripping device for optical discs according to any one of claims 1 to 6, characterized in that, The limiting end is provided with a limiting head, the size of which is larger than that of the limiting end, so as to form an abutment surface on the side of the limiting head near the limiting end. The abutment surface is used to abut against the lower surface of the optical disc when the limiting end moves out of the clearance groove.

8. A dedicated optical disc gripping device according to claim 3, characterized in that, The housing is configured as a cylindrical structure, and the size of the opening at the upper end of the housing is smaller than the inner diameter of the receiving chamber.

9. A dedicated optical disc gripping device according to claim 8, characterized in that, The size of the mounting base is larger than the size of the opening at the upper end of the housing, but smaller than the inner diameter of the receiving chamber; The size of the through-hole is smaller than the end opening of the housing, and it is configured as a cylindrical structure that can be adapted to the center hole of the optical disc. The clearance groove is opened on the radial side of the through-hole.

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