Magnet assembly and optical isolator

Abstract

The utility model discloses a magnet assembly and light isolator, wherein, the magnet assembly includes the shell and the assembly in the shell of at least two magnets, at least two the magnet is arranged in circle around the center line of magnet assembly, to enclose the magnet group of annular shape, wherein, one of the inner wall of shell and the outer wall of magnet is provided with the convex part, wherein the other is provided with the recess, the convex part and the recess cooperate to form the mortise and tenon structure, to fix the magnet in the shell. The utility model provides the magnet assembly has adopted the mortise and tenon structure design of the mutual cooperation of convex part and recess, and this magnet assembly can effectively limit the displacement of magnet in the circumferential direction and radial direction after installation. Therefore, it can make each magnet not to occur positional deviation due to the magnetic force action between each other when assembling, thereby significantly reducing the time of adjustment and alignment, improving the overall assembly efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of optical isolator technology, specifically relating to a magnet assembly and an optical isolator. Background Technology

[0002] An optical isolator is a passive magneto-optical device based on the principle of non-reciprocal optics. Its core function is to ensure the unidirectionality of optical signals during transmission, meaning that light waves can only pass in the forward direction while suppressing light traveling in the reverse direction, thereby effectively eliminating adverse interference such as reflected light in the optical system. This device typically consists of a magnet assembly, a magneto-optical crystal, a polarizer, and an analyzer. It utilizes the Faraday magneto-optical effect to achieve unidirectional light transmission and is widely used in lasers, fiber optic communication systems, and other systems to stabilize the operation of light sources.

[0003] Current optical isolators typically use multiple repulsive magnets combined into a magnetic assembly. The repulsive force between these magnets makes assembly difficult. Existing assembly methods mostly rely on adhesive to fix the magnets in place to install the magnetic assembly. However, each optical isolator requires multiple applications of adhesive, resulting in low assembly efficiency and making it difficult to meet actual production needs.

[0004] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a magnet assembly and an optical isolator. Utility Model Content

[0005] The purpose of this invention is to provide a magnet assembly and an optical isolator that can solve the problem of low assembly efficiency of magnet assemblies.

[0006] To achieve the above objectives, a specific embodiment of this utility model provides a magnet assembly including a housing and at least two magnets assembled within the housing. The at least two magnets are arranged in a circumferential array around the center line of the magnet assembly to form a ring-shaped magnet group. One of the inner wall of the housing and the outer wall of the magnets is provided with a protrusion, and the other is provided with a recess. The protrusion and the recess cooperate to form a tenon-and-mortise structure to fix the magnets within the housing.

[0007] In one or more embodiments of this utility model, the inner wall of the outer shell is provided with the protrusion, the outer wall of the magnet is provided with the recess, and the recesses of two adjacent magnets are interconnected, and the protrusion is simultaneously inserted into the two adjacent recesses.

[0008] In one or more embodiments of this utility model, the protruding direction of the protrusion and the recessed direction of the recess are both toward the center line of the magnet assembly.

[0009] In one or more embodiments of the present invention, the inner wall of the outer shell is provided with the protrusion, the outer wall of the magnet is provided with the recess, and at least a portion of the side wall of the protrusion connected to the inner wall of the outer shell abuts against the side wall of the recess connected to the outer wall of the magnet.

[0010] In one or more embodiments of this utility model, the protrusion extends along the center line of the magnet assembly, and the protrusion is continuously arranged or spaced at least two segments, and the recess is arranged in a position corresponding to the protrusion.

[0011] In one or more embodiments of the present invention, the number of protrusions is the same as the number of magnets, and each protrusion is inserted into at least one recess.

[0012] In one or more embodiments of this utility model, the outer shell is provided with a cylindrical receiving space, the axis of the receiving space is collinear with the center line of the magnet assembly, and the magnet is configured as a sector magnet.

[0013] In one or more embodiments of this utility model, the vertical projection of the inner wall of the annular magnet assembly on a plane perpendicular to the center line of the magnet assembly is circular, elliptical, or rectangular.

[0014] In one or more embodiments of this utility model, the inner wall of the outer shell is provided with the recessed portion, and the outer wall of the magnet is provided with the protruding portion.

[0015] A specific embodiment of this utility model also provides an optical isolator, including the above-described magnet assembly.

[0016] Compared with existing technologies, the magnet assembly provided by this utility model allows operators to insert magnets one by one into the housing during assembly. Due to the mortise and tenon structure with protruding and recessed parts, the insertion and removal method is more convenient than traditional adhesive bonding. Furthermore, this magnet assembly effectively restricts the position of the magnets after installation, specifically limiting their circumferential and radial positions. Therefore, it prevents the magnets from shifting position due to magnetic forces during assembly, significantly reducing adjustment and alignment time and improving overall assembly efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the magnet assembly in one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram showing the interaction between the internal magnet assembly and the magnetic ring of the magnet assembly in one embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the outer shell in one embodiment of the present invention;

[0021] Figure 4 This is a left view of the magnet assembly in one embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the magnet structure in one embodiment of the present invention;

[0023] Figure 6 This is a left view of the magnet assembly in another embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the magnet structure in another embodiment of the present invention.

[0025] Explanation of key figure labels:

[0026] 1. Outer shell; 11. Reception space; 2. Magnet assembly; 21. Magnet; 3. Magnetic ring; 4. Protrusion; 5. Recess. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0028] An optical isolator is a passive device that utilizes the Faraday magneto-optical effect. Through the cooperation of a magnet assembly, magneto-optical crystal, polarizer, and analyzer, it enables unidirectional transmission of optical signals. Its core function is to allow forward light to pass through while suppressing reverse light, thereby eliminating reflection interference in optical systems. It is widely used in lasers and fiber optic communication systems to ensure stable operation.

[0029] Current optical isolators often use multiple mutually repelling magnets to form a magnetic assembly. The repulsive force between the magnets makes assembly difficult. Existing processes rely on adhesive to fix the magnets one by one, requiring multiple bonding operations for each device, resulting in low assembly efficiency and making it difficult to meet actual production needs.

[0030] Based on the aforementioned technical problems, this utility model provides an optimized approach to effectively improve the overall assembly efficiency of a magnet assembly. Specifically, in the magnet assembly of this utility model, the magnet and the outer shell are fitted together using a mortise and tenon structure, thereby firmly fixing the magnet inside the outer shell. Therefore, this method allows operators to insert the magnets into the outer shell one by one, significantly reducing the time spent on adjustment and alignment, and improving the overall assembly efficiency of the magnet assembly. The magnet assembly of this utility model will be described in detail below with reference to specific embodiments.

[0031] Based on the above ideas, please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the magnet assembly in one embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the interaction between the internal magnet group 2 and the magnetic ring 3 of a magnet assembly in one embodiment of the present invention. The magnet assembly provided by the present invention includes a housing 1, magnet groups 2, and magnetic rings 3. The magnet groups 2 and magnetic rings 3 are installed inside the housing 1. Two sets of magnet groups 2 are provided, with a magnetic ring 3 positioned between the two sets of magnet groups 2, and the magnet groups 2 and magnetic rings 3 are coaxially arranged. Each magnet group 2 includes at least two magnets 21. By reasonably setting the orientation of the magnetic poles of each magnet 21 and the magnetic ring 3 in the magnet group 2, the unidirectional transmission function of optical signals in the optical isolator can be achieved.

[0032] Please refer to Figure 2 At least two magnets 21 are arranged in a circular array around the center line of the magnet assembly to form the aforementioned magnet group 2 in a ring shape. The center line of the magnet assembly can be referenced... Figure 1 or Figure 2 The dotted lines in the diagram. In this embodiment, four magnets 21 are provided in a magnet group 2. This is not a limitation on the number. In other embodiments, there may be two, three, five, six or even more magnets 21 in a magnet group 2. This invention does not impose any limitation on this.

[0033] Please combine Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the outer shell in one embodiment of the present invention. Figure 4 This is a left view of the magnet assembly in one embodiment of the present invention. In this embodiment, the outer shell 1 is provided with a cylindrical receiving space 11, the axis of which is collinear with the center line of the magnet assembly. The magnet 21 can be configured as a sector magnet 21. Multiple sector magnets 21 can be arranged to form a roughly circular magnet group 2.

[0034] Please refer to Figure 2 , Figure 3 as well as Figure 4In this embodiment, one of the inner wall of the outer shell 1 and the outer wall of the magnet 21 is provided with a protrusion 4, and the other is provided with a recess 5. The protrusion 4 and the recess 5 are tenon and mortise fit (i.e. interference fit) to fix the magnet 21 inside the outer shell 1, thereby effectively restricting the position of the magnet 21. Specifically, it can restrict the circumferential displacement and radial displacement of the magnet 21.

[0035] Understandably, in one embodiment, a protrusion 4 can be provided on the inner wall of the outer casing 1, and a recess 5 can be provided on the outer wall of the magnet 21; in another embodiment, a recess 5 can also be provided on the inner wall of the outer casing 1, and a protrusion 4 can be provided on the outer wall of the magnet 21. The outer casing 1 can be made relatively thicker to facilitate the provision of the recess 5 on its inner wall. This invention does not impose specific limitations in this regard.

[0036] During assembly, the operator can place the magnets 21 one by one into the receiving space 11 of the outer casing 1, using the protrusions 4 and recesses 5 to position them and restrict their circumferential and radial degrees of freedom. Simultaneously, the operator can press the magnets 21 along the centerline of the magnet assembly to restrict their degrees of freedom in that direction. The assembly of the two magnet groups 2 and the magnetic ring 3 can be completed sequentially using this method.

[0037] Therefore, compared to installation by adhesive bonding of the magnets 21, the magnet assembly provided by this utility model allows operators to insert the magnets 21 one by one into the housing 1 during assembly. Because the protrusion 4 and the recess 5 are tightly fitted with a tenon-and-mortise structure, the circumferential and radial displacement of the magnets 21 is effectively limited after installation. Therefore, it ensures that the magnets 21 will not shift position due to magnetic forces during assembly, significantly reducing adjustment and alignment time and improving overall assembly efficiency. Simultaneously, the reasonable setting of the dimensions of the protrusion 4 and the recess 5 allows for precise control of the spacing between the two magnets 21, eliminating the need for multiple adjustments by the operator and further improving overall assembly efficiency.

[0038] Please refer to Figure 4 In this embodiment, the inner wall of the outer casing 1 is provided with a protrusion 4, and the outer wall of the magnet 21 is provided with a recess 5. The recesses 5 of two adjacent magnets 21 are interconnected, and the protrusion 4 is simultaneously inserted into the two adjacent recesses 5. The protrusion 4 can be configured as a raised strip, which can be integrally formed with the outer casing 1. Figure 5 , Figure 5 This is a schematic diagram of the magnet structure in one embodiment of the present invention. The recessed portion 5 can be configured as a groove. The protruding portion 4 is simultaneously inserted into two adjacent recessed portions 5, and the peripheral sidewalls of the protruding portion 4 can abut against the recessed portion 5 of the magnet 21. Therefore, the magnet 21 can be effectively restricted in its circumferential and radial degrees of freedom, thereby ensuring the effect of limiting its position.

[0039] In one alternative embodiment, a recessed portion 5 may be provided on the inner wall of the outer casing 1, and a protruding portion 4 may be provided on the outer wall of the magnet 21. Similarly, in this embodiment, two adjacent protruding portions 5 may be brought close to each other, and the two adjacent protruding portions 5 may be simultaneously inserted into the same recessed portion 5 to form a tenon and mortise structure, which is used to restrict the circumferential and radial degrees of freedom of the magnet 21.

[0040] Please refer to Figure 6 and Figure 7 , Figure 6 This is a left view of the magnet assembly in another embodiment of the present invention. Figure 7 This is a schematic diagram of the magnet structure in another embodiment of the present invention. In another optional embodiment, a recessed portion 5 may be provided in the middle of the outer wall of the magnet 21, and the protruding portion 4 may be correspondingly provided. This can also effectively limit the position of the magnet 21. The present invention does not specifically limit this. Similarly, in yet another embodiment, a protruding portion 4 may be provided in the middle of the outer wall of the magnet 21, and the recessed portion 5 on the inner wall of the outer shell 1 may be correspondingly provided.

[0041] Please refer to Figure 2 and Figure 3 The protruding direction of the protrusion 4 and the recessed direction of the recess 5 both face the center line of the magnet assembly. Please refer to the center line of the magnet assembly. Figure 2 and Figure 3 The dotted lines in the diagram allow for a better match between the shapes of the protrusions 4 and the inner walls of the recesses 5, increasing the contact area between them and thus ensuring the circumferential and radial upper limit effect on the magnet 21.

[0042] Please refer to Figure 4 At least a portion of the sidewall connecting the protrusion 4 to the inner wall of the outer casing 1 abuts against the sidewall connecting the recess 5 to the outer wall of the magnet 21. In this embodiment, the entire sidewall connecting the protrusion 4 to the inner wall of the outer casing 1 abuts against the sidewall connecting the recess 5 to the outer wall of the magnet 21. Specifically, in a cross-section perpendicular to the center line of the magnet assembly, the protrusion 4 and the recess 5 are approximately rectangular in shape and their shapes match, thereby ensuring that the entire protrusion 4 abuts against the inner wall of the recess 5.

[0043] Understandably, in other embodiments, the shapes of the protrusion 4 and the recess 5 may also be different, such that at least a portion of the sidewall connecting the protrusion 4 to the inner wall of the outer casing 1 abuts against the sidewall connecting the recess 5 to the outer wall of the magnet 21. This method can also limit the movement of the magnet 21. For example, the protrusion 4 may also be elliptical, and the recess 5 may be rectangular, which can also restrict the circumferential and radial degrees of freedom of the magnet 21. It should be noted that the above is only one possible example and is not a limitation on the corresponding shapes of the protrusion 4 and the recess 5 in this utility model.

[0044] Please combine Figure 2 and Figure 3 The protrusion 4 extends along the centerline of the magnet assembly, and the protrusion 4 is continuously arranged or at least two segments are spaced apart. The recess 5 is positioned corresponding to the protrusion 4. The protrusion 4 extending along the centerline of the magnet assembly facilitates the insertion of the magnet 21 into the housing 1 along this centerline. It is understood that whether the protrusion 4 is a continuous long strip or at least two short strips spaced apart, it can achieve circumferential and radial positioning of the magnet 21.

[0045] Please refer to Figure 4 The number of protrusions 4 is the same as the number of magnets 21, and each protrusion 4 is inserted into at least one recess 5. This arrangement ensures that each protrusion 4 corresponds one-to-one with a magnet 21, thereby guaranteeing that each magnet 21 can be easily installed inside the housing 1.

[0046] Please refer to Figure 4 On a plane perpendicular to the centerline of the magnet assembly, the vertical projection of the inner wall of the annular magnet assembly 2 can be circular, elliptical, or rectangular. Depending on the design, the vertical projection of the inner wall of the annular magnet assembly 2 can have different shapes; it can be regular or irregular. This embodiment uses a circular vertical projection of the inner wall of the magnet assembly 2 as an example for demonstration.

[0047] Please refer to Figure 1 In one embodiment of this utility model, an optical isolator is also provided, including the aforementioned magnet assembly. It is understood that by providing the aforementioned magnet assembly, the protrusion 4 and the recess 5 can effectively limit the circumferential and radial displacement of the magnet 21 after installation, thereby facilitating the operator to insert the magnets 21 one by one into the housing 1. This significantly reduces the adjustment and alignment time, improves the assembly efficiency of the magnet assembly, and also improves the overall assembly efficiency of the optical isolator.

[0048] In the description of the embodiments of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the product is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnet assembly, characterized in that, It includes a housing (1) and at least two magnets (21) assembled within the housing (1), wherein the at least two magnets (21) are arranged in a circumferential array around the center line of the magnet assembly to form a ring-shaped magnet group (2). One of the inner wall of the outer shell (1) and the outer wall of the magnet (21) is provided with a protrusion (4), and the other is provided with a recess (5). The protrusion (4) and the recess (5) cooperate to form a tenon and mortise structure to fix the magnet (21) inside the outer shell (1).

2. The magnet assembly according to claim 1, characterized in that, The inner wall of the outer shell (1) is provided with the protrusion (4), the outer wall of the magnet (21) is provided with the recess (5), and the recesses (5) of two adjacent magnets (21) are interconnected, and the protrusion (4) is inserted into the two adjacent recesses (5) at the same time.

3. The magnet assembly according to claim 1, characterized in that, The protruding direction of the protrusion (4) and the recessed direction of the recess (5) are both oriented toward the center line of the magnet assembly.

4. The magnet assembly according to claim 1, characterized in that, The inner wall of the outer shell (1) is provided with the protrusion (4), and the outer wall of the magnet (21) is provided with the recess (5). At least a portion of the side wall of the protrusion (4) connected to the inner wall of the outer shell (1) abuts against the side wall of the recess (5) connected to the outer wall of the magnet (21).

5. The magnet assembly according to claim 1, characterized in that, The protrusion (4) extends along the center line of the magnet assembly, and the protrusion (4) is continuously provided or at least two segments are provided at intervals. The recess (5) is provided in a position corresponding to the protrusion (4).

6. The magnet assembly according to claim 1, characterized in that, The number of protrusions (4) is the same as the number of magnets (21), and each of the protrusions (4) is inserted into at least one of the recesses (5).

7. The magnet assembly according to claim 1, characterized in that, The outer casing (1) is provided with a cylindrical receiving space (11), the axis of the receiving space (11) is collinear with the center line of the magnet assembly, and the magnet (21) is configured as a fan-shaped magnet (21).

8. The magnet assembly according to claim 1, characterized in that, On a plane perpendicular to the center line of the magnet assembly, the vertical projection of the inner wall of the annular magnet assembly (2) is circular, elliptical, or rectangular.

9. The magnet assembly according to claim 1, characterized in that, The inner wall of the outer shell (1) is provided with the recess (5), and the outer wall of the magnet is provided with the protrusion (4).

10. An optical isolator, characterized in that, Includes the magnet assembly as described in any one of claims 1-9.

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