Fixing seat and optical coupling machine table

Abstract

The utility model relates to the technical field of optical coupling, and provides a fixing base and an optical coupling machine table, the fixing base comprises a base body and a pressing block, the base body is provided with a containing groove used for containing a circuit board, and the containing groove comprises a first side wall and a second side wall which are oppositely arranged; the pressing block is arranged on one of the first side wall and the second side wall, a pressing surface is formed on the surface of the other side wall, and the pressing block and the pressing surface are used for limiting the circuit board; or the first side wall and the second side wall are both provided with pressing blocks, and each pressing block is used for limiting the circuit board. Balanced stress, stable positioning and efficient optical coupling of the circuit board can be realized, and the optical coupling device has the characteristics of simple structure, low cost and the like.

Description

Technical Field

[0001] The present application relates to the field of optical coupling technology, and in particular provides a fixing seat and an optical coupling machine. Background Art

[0002] In the related technology, the optical module is a photoelectric conversion product, which mainly includes circuit boards, optical chips, optical fibers, lenses and other structures. The optical chip includes a laser and a photodetector. The optical chip is mounted on the circuit board. The optical chip and the optical fiber are optically coupled through a lens to achieve the conversion of optical signals and electrical signals. The lens can converge the light emitted by the laser and guide it to the optical fiber for transmission; similarly, the optical signal coming out of the optical fiber can be converged by the lens and guided to the photodetector, thereby converting it into an electrical signal.

[0003] At present, in the optical coupling preparation stage, the circuit board needs to be fixed on the mounting base of the optical coupling machine first. The existing mounting base mainly adopts a single-sided pressing method to fix the circuit board, which causes uneven force on both sides of the circuit board and is prone to position tilt, resulting in low coupling efficiency of the optical module. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a fixing seat and an optical coupling machine, aiming to solve the problems existing in the related art such as uneven force, tilted position and low coupling efficiency caused by unilateral compression of the circuit board in the optical module.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] The present application provides a fixing seat, comprising:

[0007] The seat body is provided with a receiving groove for placing the circuit board, and the receiving groove includes a first side wall and a second side wall which are arranged oppositely;

[0008] A pressing block is arranged on one of the first side wall and the second side wall, and a pressing surface is constructed on the surface of the other side wall, and the pressing block and the pressing surface are used to limit the circuit board;

[0009] Alternatively, the pressing blocks are disposed on both the first side wall and the second side wall, and each pressing block is used to limit the position of the circuit board.

[0010] The fixing seat provided in the present application can effectively solve a series of problems caused by unilateral compression of the circuit board in the existing optical module by designing a double-sided compression and limiting structure, realize balanced force, stable positioning and efficient optical coupling of the circuit board, and has the characteristics of simple structure and low cost.

[0011] Optionally, the first side wall and / or the second side wall is provided with a mounting groove communicated with the accommodating groove, the pressing block is arranged in the mounting groove and can rotate relative to the seat body, and is suitable for switching between a first position and a second position;

[0012] In the first position, part of the main body of the pressing block extends into the accommodating groove to limit the circuit board;

[0013] In the second position, the pressing block is built into the mounting slot to be separated from the circuit board.

[0014] Optionally, the pressing blocks are disposed on both the first side wall and the second side wall, and the pressing blocks on both sides are limited to the same rotation angle of the circuit board.

[0015] Optionally, a part of the main body of the pressing block is provided with a pressing portion adjacent to a side wall of the accommodating groove.

[0016] Optionally, the pressing block is horizontally slidably disposed on the top of the first side wall and / or the second side wall, and is suitable for switching between a third position and a fourth position;

[0017] In the third position, the pressing block slides onto the circuit board to limit the circuit board;

[0018] In the fourth position, the pressing block is separated from the circuit board.

[0019] Optionally, the pressing surface is a curved surface or an inclined surface.

[0020] Optionally, the pressing surface is the inclined surface, and the angle between the pressing surface and the bottom wall of the accommodating groove is an acute angle.

[0021] Optionally, an opening is provided at the top of the accommodating groove, and the bottom wall of the accommodating groove is recessed in a direction away from the opening to construct an avoidance groove and step portions located on opposite sides of the avoidance groove, and the step portions are used to support the circuit board.

[0022] Optionally, a first positioning structure is provided in the accommodating groove, and a second positioning structure is provided on the circuit board. One of the first positioning structure and the second positioning structure is a positioning protrusion or a positioning pin, and the other is a positioning hole, and the positioning hole is connected to the positioning protrusion or the positioning pin.

[0023] The present application also provides an optical coupling machine, including: the above-mentioned fixing seat.

[0024] The optical coupling machine provided in the present application can effectively solve a series of problems caused by unilateral compression of the circuit board in the existing optical module by designing a fixing seat with a double-sided clamping and limiting structure, realize balanced force, stable positioning and efficient optical coupling of the circuit board, and has the characteristics of simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 One of the structural schematic diagrams of the fixing base provided in the embodiment of the present application;

[0027] Figure 2 The second structural schematic diagram of the fixing base provided in the embodiment of the present application;

[0028] Figure 3 A schematic diagram of the assembly of a circuit board provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of force analysis of a circuit board provided in an embodiment of the present application;

[0030] Figure 5 One of the structural schematic diagrams of the pressing block provided in the embodiment of the present application;

[0031] Figure 6 This is the second structural schematic diagram of the pressing block provided in the embodiment of the present application.

[0032] Among them, the reference numerals in the figure are:

[0033] 100: seat body; 101: receiving groove; 1011: first side wall; 1012: second side wall;

[0034] 102: pressing surface; 103: mounting groove; 104: first connecting hole; 105: avoidance groove;

[0035] 106: step part;

[0036] 200: pressing block; 201: second connecting hole; 202: pressing part;

[0037] 300: Circuit board. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0039] In the description of the embodiments of the present application, it should be understood that the terms "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] According to the embodiment of the first aspect of the present application, referring to Figure 1-Figure 6 As shown, the present application provides a fixing seat, comprising: a seat body 100 and a pressing block 200. The seat body 100 is provided with a receiving groove 101 for placing a circuit board 300, and the receiving groove 101 comprises a first side wall 1011 and a second side wall 1012 arranged opposite to each other; the pressing block 200 is arranged on one of the first side wall 1011 and the second side wall 1012, and a pressing surface 102 is constructed on the surface of the other side wall, and the pressing block 200 and the pressing surface 102 are used to limit the circuit board 300; or, the pressing blocks 200 are arranged on both the first side wall and the second side wall, and each pressing block 200 is used to limit the circuit board 300.

[0043] In this embodiment of the present application, the seat body 100 serves as the base part of the entire fixing seat, and its main function is to provide support and positioning for the circuit board 300 .

[0044] The receiving groove 101 is provided in the base 100 for accurately placing the circuit board 300. The design size of the receiving groove 101 matches the circuit board 300 so that the circuit board 300 can be smoothly embedded while avoiding installation difficulties or stress concentration caused by too large a gap or too tight a fit.

[0045] The pressing block 200 is disposed on at least one side of the first side wall and the second side wall of the accommodating groove 101 , and is used to apply a pressing force to the circuit board 300 to ensure that the circuit board 300 is stably fixed.

[0046] The pressing surface 102 is constructed on the other side wall opposite to the pressing block 200 , and cooperates with the pressing block 200 to press two sides of the circuit board 300 .

[0047] The embodiment of the present application can provide two pressing and limiting methods: one is that the pressing block 200 is arranged on one side wall of the first side wall 1011 and the second side wall 1012, and the pressing surface 102 is arranged on the other side wall; the other is that the pressing block 200 is arranged on both the first side wall 1011 and the second side wall 1012. In either method, both sides of the circuit board 300 can be pressed and limited at the same time, which significantly improves the uneven force on the circuit board 300 compared to the traditional single-side pressing method, and effectively prevents the circuit board 300 from tilting.

[0048] It can be understood that the double-sided clamping and limiting structure provides the circuit board 300 with a balanced clamping force during installation, thereby avoiding bending or deformation of the board caused by unilateral force and improving installation stability.

[0049] Furthermore, the uniform pressing force can ensure that the circuit board 300 remains horizontal after installation, avoiding the decrease in the alignment accuracy of the optical fiber, optical chip and lens due to the tilted position, which is beneficial to improving the optical coupling efficiency and thus improving the overall performance of the optical module.

[0050] Therefore, the fixing seat provided in the embodiment of the present application can effectively solve a series of problems caused by the unilateral compression of the circuit board 300 in the existing optical module by designing a double-sided compression and limiting structure, realize balanced force, stable positioning and efficient optical coupling of the circuit board 300, and has the characteristics of simple structure and low cost.

[0051] According to one embodiment of the present application, referring to Figure 1 and Figure 3As shown, the first side wall 1011 and / or the second side wall 1012 is provided with a mounting groove 103 connected to the accommodating groove 101, and the pressing block 200 is arranged in the mounting groove 103 and can rotate relative to the base body 100, and is suitable for switching between a first position and a second position; in the first position, part of the main body of the pressing block 200 extends into the accommodating groove 101 to limit the circuit board 300; in the second position, the pressing block 200 is built into the mounting groove 103 to be separated from the circuit board 300.

[0052] In this embodiment of the present application, the side wall where the pressing block 200 is located is provided with a mounting groove 103, which provides a space for installation and movement of the pressing block 200. The size of the mounting groove 103 matches the pressing block 200, allowing it to rotate smoothly.

[0053] The pressing block 200 is rotatably disposed in the mounting groove 103. This design enables the pressing block 200 to dynamically adjust its position. By rotating the pressing block 200, it can be switched between the first position (pressing and limiting state) and the second position (release state), thereby realizing the rapid assembly and disassembly of the circuit board 300. This design not only improves the assembly efficiency, but also facilitates the inspection, maintenance or replacement of the circuit board 300 when necessary.

[0054] When the pressing block 200 is deflected to the first position toward the direction close to the receiving groove 101, the upper body of the pressing block 200 extends out of the mounting groove 103 and abuts against the circuit board 300 in the receiving groove 101, thereby effectively clamping the circuit board 300 and stably fixing the circuit board 300 in the receiving groove 101.

[0055] When the pressing block 200 is deflected to the second position in a direction away from the receiving groove 101, the pressing block 200 is built into the installation groove 103, separated from the circuit board 300 in the receiving groove 101, and the clamping of the circuit board 300 is released. At this time, the circuit board 300 can be easily put into or taken out of the receiving groove 101, which is convenient for debugging or maintenance work.

[0056] Therefore, the rotatable design and clamping limit / release function of the pressing block 200 in the embodiment of the present application provide a flexible and convenient operation method for installing the circuit board 300 of the optical module, which not only ensures the stable fixation of the circuit board 300, but also greatly simplifies the assembly and maintenance process.

[0057] According to an embodiment of the present application, a pressing block 200 is disposed on both the first side wall 1011 and the second side wall 1012 of the accommodating groove 101 , and the pressing blocks 200 on both sides are limited to the same rotation angle of the circuit board 300 .

[0058] In this embodiment of the present application, a symmetrical layout is formed by arranging the pressing blocks 200 on both sides of the receiving groove 101. Such a design ensures that the two sides of the circuit board 300 have relatively close compression and limiting conditions in structure, which is conducive to achieving force balance.

[0059] When the circuit board 300 needs to be pressed, the pressing blocks 200 on both sides can be rotated to the first position at the same time. In this way, whether in the starting stage of the pressing action or in the final pressing state, the pressure applied by the pressing blocks 200 on the circuit board 300 is always consistent, thereby achieving balanced force on both sides of the circuit board 300.

[0060] This pressure balance helps prevent the circuit board 300 from being tilted due to uneven force, ensuring that the circuit board 300 is stable in the fixing seat, which is crucial for the precise optical coupling process. At the same time, balanced force is also conducive to reducing stress concentration and protecting the circuit board 300 from potential physical damage.

[0061] Therefore, the embodiment of the present application achieves accurate and balanced force on both sides of the circuit board 300 by symmetrically installing the pressing blocks 200 on both sides of the receiving groove 101 of the fixing seat and ensuring that the pressing blocks 200 on both sides rotate synchronously at the same angle to press the circuit board 300. This design not only effectively solves the problem of the circuit board 300 being tilted due to uneven force, but also optimizes the alignment accuracy of the internal components of the optical module, which is conducive to improving the optical coupling efficiency and the overall performance of the optical module.

[0062] According to one embodiment of the present application, referring to Figure 1 and Figure 5 As shown, the fixing seat also includes: a rotating shaft and a motor and other components. A first connecting hole 104 is provided on the seat body 100, and a second connecting hole 201 is provided on the pressing block 200. The rotating shaft passes through the first connecting hole 104 and the second connecting hole 201, and the two ends of the rotating shaft are respectively located on the two side walls of the mounting groove 103. The motor is connected to the rotating shaft, and the rotating shaft is driven to rotate by the motor, thereby driving the pressing block 200 to rotate.

[0063] When the pressing block 200 rotates to the first position, the upper body of the pressing block 200 can abut against the edge of the circuit board 300 to achieve clamping and limiting; when the pressing block 200 rotates in the opposite direction to the second position, the upper body of the pressing block 200 separates from the edge of the circuit board 300 to achieve release.

[0064] According to one embodiment of the present application, referring to Figure 6 As shown, a pressing portion 202 is provided on a portion of the main body of the pressing block 200 adjacent to the side wall of the receiving groove 101 .

[0065] In this embodiment of the present application, a protrusion can be provided on the inner wall surface of the upper end of the pressing block 200 to construct a pressing portion 202, and the pressing portion 202 can be pressed tightly against the edge of the circuit board 300 to achieve effective clamping, thereby further improving the installation stability of the circuit board 300.

[0066] According to one embodiment of the present application, the pressing block 200 can be horizontally slidably disposed on the top of the first side wall 1011 and / or the second side wall 1012, and is suitable for switching between a third position and a fourth position; in the third position, the pressing block 200 slides onto the circuit board 300 to limit the circuit board 300; in the fourth position, the pressing block 200 is detached from the circuit board 300.

[0067] For example, a slide rail is provided at the top of the side wall where the pressing block 200 is located, and the pressing block 200 is connected to the linear motor through a connecting rod, and the linear motor drives the pressing block 200 to slide back and forth horizontally in the slide rail. When the pressing block 200 slides to the third position (pressing limit state), the pressing block 200 is located above the edge of the circuit board 300, pressing the circuit board 300 downward to effectively fix the circuit board 300. When the pressing block 200 slides in the opposite direction to the fourth position (release state), the pressing block 200 is separated from the circuit board 300, releasing the clamping of the circuit board 300, thereby realizing the installation and removal of the circuit board 300.

[0068] According to an embodiment of the present application, the pressing surface 102 is a curved surface or an inclined surface.

[0069] In this embodiment of the present application, the pressing surface 102 is designed as a curved surface or an inclined surface, and the curved surface can be a convex curved surface or a concave curved surface, rather than a traditional vertical surface. Such a design enables the pressing surface 102 to exert a downward force component, which helps to improve the force balance on both sides of the circuit board 300.

[0070] For example, Figure 4 As shown, the shape of the circuit board 300 is roughly square, and the wall on the right side is a vertical surface. The pressure F1 applied by the right pressure block 200 when pressing the circuit board 300 can be decomposed into a component force F11 to the left along the horizontal direction and a component force F12 to the downward direction in the vertical direction; and the pressure F2 applied by the inclined surface on the left side when pressing the circuit board 300 can be decomposed into a component force F21 to the right along the horizontal direction and a component force F22 to the downward direction in the vertical direction, so that both sides of the circuit board 300 are subjected to downward pressure, thereby improving the phenomenon of uneven force on the circuit board 300.

[0071] Therefore, the embodiment of the present application designs the pressing surface 102 as a curved surface or an inclined surface, so that downward pressure can be applied during the pressing and limiting process, which complements the clamping force on one side of the pressing block 200. This design can effectively improve the force distribution on both sides of the circuit board 300, avoid the tilt of the circuit board 300 due to uneven force, and thus improve the coupling efficiency and overall performance of the optical module.

[0072] According to one embodiment of the present application, referring to Figure 2 As shown, the pressing surface 102 is an inclined surface, and the angle a between the pressing surface 102 and the bottom wall of the receiving groove 101 is an acute angle. For example, a can be 30° to 60°.

[0073] In this embodiment, the acute angle design between the pressing surface 102 and the bottom wall of the accommodating groove 101 can ensure that the pressing surface 102 can apply downward pressure during the pressing process. This pressure works together with the downward pressure applied by the pressing block 200 to ensure that the circuit board 300 is stably supported and limited during the installation process, thereby improving its stability.

[0074] According to one embodiment of the present application, referring to Figure 2 and Figure 3 As shown, an opening is provided at the top of the accommodating groove 101, and the bottom wall of the accommodating groove 101 is recessed in a direction away from the opening to construct an avoidance groove 105 and step portions 106 located on opposite sides of the avoidance groove 105, and the step portions 106 are used to support the circuit board 300.

[0075] In this embodiment of the present application, the opening structure at the top of the receiving groove 101 can facilitate the placement of the circuit board 300, and the bottom wall of the receiving groove 101 is recessed downward, forming a unique structural layout. This design breaks the conventional flat bottom wall structure and provides a specific accommodation space for the circuit board 300 and the electronic components at the bottom thereof. Specifically:

[0076] The recessed area is the avoidance groove 105, and its main function is to provide an avoidance space for the electronic components at the bottom of the circuit board 300. When installing the circuit board 300, its bottom may be equipped with electronic components such as capacitors, resistors, integrated circuits, etc., and the height of these components exceeds the plane of the circuit board. The existence of the avoidance groove 105 allows these protruding electronic components to be smoothly embedded, avoiding damage due to collision with the bottom wall of the accommodating groove 101 during the installation process.

[0077] Steps 106 are formed on opposite sides of the avoidance groove 105, and these steps 106 and the avoidance groove 105 together form a step-shaped bearing platform. The main function of the step 106 is to provide stable support for the circuit board 300. After the circuit board 300 is installed, the edge of its main body is located on the step 106, and the electronic components at the bottom are embedded in the avoidance groove 105, which not only ensures the overall stable support of the circuit board 300, but also avoids the electronic components of the circuit board 300 from contacting the bottom wall, effectively preventing component damage caused by extrusion or friction.

[0078] According to one embodiment of the present application, a first positioning structure is provided in the accommodating groove 101, and a second positioning structure is provided on the circuit board 300. One of the first positioning structure and the second positioning structure is a positioning protrusion or a positioning pin, and the other is a positioning hole, and the positioning hole is connected to the positioning protrusion or the positioning pin.

[0079] For example, a plurality of evenly distributed positioning pins are disposed on the step portion 106 of the receiving groove 101 , and a plurality of positioning holes are correspondingly disposed on the edge of the circuit board 300 . During assembly, the positioning holes of the circuit board 300 are inserted into the positioning pins of the receiving groove 101 .

[0080] The embodiment of the present application realizes the limited installation of the circuit board 300 in the accommodating groove 101 by connecting the positioning protrusion or the positioning pin with the positioning hole. The limited installation ensures that the circuit board 300 is in the correct position before pressing, reduces the influence of the subsequent pressing operation on the position accuracy, improves the alignment accuracy of the optical module assembly, and is conducive to improving the optical coupling efficiency.

[0081] Furthermore, through the above positioning structure design, the circuit board 300 can be quickly and accurately positioned in the receiving groove 101 each time it is taken in and placed, reducing the number and duration of repeated adjustments caused by position errors, and significantly improving the assembly efficiency of the optical module.

[0082] According to an embodiment of the present application, a power supply is provided on the base 100 , and the power supply is electrically connected to the circuit board 300 for supplying power to the circuit board 300 .

[0083] Specifically, the seat 100 not only serves as a physical support and positioning device for the circuit board 300, but also integrates the function of supplying power to the circuit board 300, forming a power supply seat design. This integrated design can reduce the need for external power cables.

[0084] The power supply and the circuit board 300 are electrically connected to transfer energy. The electrical connection methods may include pin-type, welding type, conductive adhesive bonding type, etc., to ensure that the current path between the power supply and the circuit board 300 is stable and reliable, and meet the power requirements of the normal operation of the circuit board 300.

[0085] According to an embodiment of the second aspect of the present application, the present application further provides an optical coupling machine, which mainly includes: a fixing base of any one of the above embodiments.

[0086] The optical coupling machine provided in the embodiment of the present application can effectively solve a series of problems caused by the unilateral compression of the circuit board 300 in the existing optical module by designing a fixing seat with a double-sided clamping and limiting structure, thereby achieving balanced force, stable positioning and efficient optical coupling of the circuit board 300, and has the characteristics of simple structure and low cost.

[0087] According to one embodiment of the present application, the optical coupling machine further includes: a workbench and an adjustment mechanism, the fixing seat is arranged on the workbench, and the adjustment mechanism can be arranged on the workbench or on the side of the workbench. The adjustment mechanism is used to adjust the position of the lens in the optical module so that the optical chip (laser and photodetector) on the circuit board 300 in the fixing seat is optically coupled with the optical fiber through the lens.

[0088] Specifically, the main function of the adjustment mechanism is to accurately adjust the position of the lens in three-dimensional space so that the lens can accurately converge the light emitted by the laser and guide it to the optical fiber for transmission, and can also accurately converge the light signal from the optical fiber through the lens and guide it to the photodetector, thereby converting it into an electrical signal to achieve efficient optical coupling. The adjustment mechanism can be a robotic arm, a three-dimensional drive mechanism, and other equipment.

[0089] During the optical coupling process, the circuit board 300 is first stably mounted on the workbench through a fixing seat to ensure that the position of the circuit board 300, especially the optical chip, is accurately fixed. Then, the lens is finely adjusted through the adjustment mechanism to achieve the best coupling state with the optical chip and the optical fiber. In this state, the intensity of the optical signal received by the optical fiber or the photodetector is the maximum.

[0090] Therefore, the optical coupling machine provided in the embodiment of the present application can achieve precise control of the lens position through the adjustment mechanism, further ensuring efficient coupling of the optical module, thereby improving the overall performance and reliability of the optical module.

[0091] The above are only preferred embodiments of the present application and are not intended to limit the embodiments of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A fixing seat, characterized in that: include: The seat body is provided with a receiving groove for placing the circuit board, and the receiving groove includes a first side wall and a second side wall which are arranged oppositely; A pressing block is arranged on one of the first side wall and the second side wall, and a pressing surface is constructed on the surface of the other side wall, and the pressing block and the pressing surface are used to limit the circuit board; Alternatively, the pressing blocks are disposed on both the first side wall and the second side wall, and each pressing block is used to limit the position of the circuit board.

2. The fixing seat according to claim 1, characterized in that: The first side wall and / or the second side wall is provided with a mounting groove connected to the accommodating groove, the pressing block is arranged in the mounting groove and can rotate relative to the seat body, and is suitable for switching between a first position and a second position; In the first position, part of the main body of the pressing block extends into the accommodating groove to limit the circuit board; In the second position, the pressing block is built into the mounting slot to be separated from the circuit board.

3. The fixing seat according to claim 2, characterized in that: The pressing blocks are disposed on both the first side wall and the second side wall, and the pressing blocks on both sides are limited to the same rotation angle of the circuit board.

4. The fixing seat according to claim 2, characterized in that: A part of the main body of the pressing block is provided with a pressing portion adjacent to the side wall of the accommodating groove.

5. The fixing seat according to claim 1, characterized in that: The pressing block is horizontally slidably disposed on the top of the first side wall and / or the second side wall, and is suitable for switching between a third position and a fourth position; In the third position, the pressing block slides onto the circuit board to limit the circuit board; In the fourth position, the pressing block is separated from the circuit board.

6. The fixing seat according to any one of claims 1 to 5, characterized in that: The pressing surface is a curved surface or an inclined surface.

7. The fixing seat according to claim 6, characterized in that: The pressing surface is the inclined surface, and the angle between the pressing surface and the bottom wall of the accommodating groove is an acute angle.

8. The fixing seat according to any one of claims 1 to 5, characterized in that: An opening is provided at the top of the accommodating groove, and the bottom wall of the accommodating groove is recessed in a direction away from the opening to construct an escape groove and step portions located on opposite sides of the escape groove, wherein the step portions are used to support the circuit board.

9. The fixing seat according to any one of claims 1 to 5, characterized in that: A first positioning structure is provided in the accommodating groove, and a second positioning structure is provided on the circuit board. One of the first positioning structure and the second positioning structure is a positioning protrusion or a positioning pin, and the other is a positioning hole, and the positioning hole is connected to the positioning protrusion or the positioning pin.

10. An optical coupling machine, characterized in that: include: The fixing seat according to any one of claims 1 to 9.

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