Limiting structure suitable for optocoupler product forming and mold
By installing the limit structure on the optocoupler product forming mold, and using the limit part to accurately limit the placement position of the optocoupler product, the problem of DAMBAR bending deformation offset is solved, and product quality and production efficiency are improved.
Patent Information
- Application Number
- CN202421123576.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-21
AI Technical Summary
During the molding process of existing optocoupler products, DAMBAR is prone to bend, deform and offset, resulting in the PAD and inner pin positions that do not match the drawing size, affecting product quality and user use.
A limit structure is designed, including a base and a limiting member. The limiting member is equipped with a limiting support and a limiting part. It is installed on the mold through the base, and the limiting part is used to accurately limit the placement position of the optocoupler product. Prevent position offset.
Effectively prevent positional deviation of optocoupler products during molding, improve processing accuracy and product quality, simplify subsequent processes, and improve production efficiency.
Smart Images
Figure CN222470497U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mold manufacturing, in particular to a limiting structure and a mold suitable for molding optical coupling products. Background Art
[0002] Photocoupler is a device that uses the photoelectric effect to achieve conversion between optical signals and electrical signals. Photocoupler is widely used in communication, sensing and control systems, and can achieve functions such as optical fiber communication, photoelectric conversion, photoelectric switch, etc. Its advantages such as good stability, fast transmission speed and strong anti-interference ability make it widely used in modern electronic equipment.
[0003] During the molding process of the optocoupler, a lead frame is required to connect the inner pins and the outer pins. The horizontal rib responsible for connecting the inner pins and the outer pins is called the center rib (DAMBAR). The part that connects the center rib and is responsible for carrying the optocoupler chip is the chip seat (PAD). When the existing optocoupler products are molded with DAMBAR, not only the PAD needs to be concavely molded, but the DAMBAR also needs to be molded so that the two optocoupler products can be matched to form a complete product. Due to material extrusion during the molding process, the material extrusion will cause the DAMBAR to bend, deform and shift in one direction, resulting in the PAD and inner pin positions connecting the DAMBAR not being consistent with the drawing size. It is more difficult to debug the upper mold, which is easy to scrap the product and affect user use.
[0004] In view of the above shortcomings, we need to develop a limiting structure and mold suitable for the molding of optocoupler products to meet the needs of the majority of users. Utility Model Content
[0005] In view of the above-mentioned problems that the DAMBAR is prone to bending, deformation and offset during the molding process of the existing optocoupler products, the position of the PAD and the inner pins connected to the DAMBAR do not conform to the drawing size, and the upper mold debugging is difficult, the technical solution adopted by the utility model to solve the technical problems is:
[0006] A limiting structure suitable for forming an optocoupler product comprises a base and a limiting member arranged on the base, wherein the limiting member has at least one limiting pillar extending in a direction away from the base, and one end of the limiting pillar is provided with a limiting portion for limiting the placement position of the optocoupler product.
[0007] Furthermore, a countersunk through hole for installation is provided in the middle of the base, and the countersunk direction of the countersunk through hole faces the bottom of the base.
[0008] Furthermore, the horizontal cross-section of the base and / or the limiting member adopts a quadrilateral structure, the quadrilateral structure includes a first connecting edge and a second connecting edge connected to the first connecting edge, the first connecting edge is greater than or equal to the second connecting edge, and the limiting member is arranged between the second connecting edge and the countersunk through hole.
[0009] Further, the quadrilateral structure is a rectangular structure, which includes long sides and short sides of different lengths. The limiting member includes a first limiting member and a second limiting member. The first limiting member is close to the short side on one side of the base, and the second limiting member is close to the short side on the other side of the base. The first limiting member and the second limiting member are symmetrically arranged on both sides of the countersunk through hole.
[0010] Furthermore, a clearance step is provided on a plane of one side of the base facing the limiting member, and the clearance step is arranged on a long side of one side of the base and sinks toward the bottom of the base.
[0011] Furthermore, the short side of the limiting member is in the same direction as the short side of the base, and the long side of the limiting member is in the same direction as the long side of the base.
[0012] Furthermore, the corners of the base and / or the limiting member are provided with chamfered structures for easy installation, and the chamfered structures can be arc corners or straight corners.
[0013] Furthermore, a limiting step for limiting the height position of the optical coupling product is provided on a side of the limiting portion facing away from the base, and the limiting steps are symmetrically arranged on both sides of the limiting portion.
[0014] Furthermore, the limiting step is provided with a guiding angle on the side away from the base to facilitate insertion of the optical coupling product, and the guiding angle forms an acute angle with the top plane of the limiting portion, and the angle range of the angle is between 10 and 80 degrees.
[0015] Furthermore, the mold is characterized in that it includes the limiting structure, and the limiting structure can be detachably installed on the mold.
[0016] The beneficial effects of the utility model are as follows:
[0017] 1. The utility model is installed on the molding mold of the optocoupler product through the base, and the limiting part on the limiting part is used to accurately limit the placement position of the optocoupler product during the molding process, so that the optocoupler product will not be easily displaced, which is convenient for precise processing in subsequent processes, improves processing accuracy, and improves product quality. The limiting structure is simple as a whole, easy to install and produce, and can be used in large quantities on the production line of optocoupler products to improve production efficiency and production quality.
[0018] 2. The utility model provides a limiting step on the limiting member, which effectively limits the placement height of the optocoupler product through a step height of a certain size, and provides guide angles on both sides of the limiting step to facilitate the placement and introduction of the optocoupler product, thereby reducing the precision requirements for the placement of the optocoupler product and improving the placement accuracy of the optocoupler product.
[0019] The utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a three-dimensional diagram of a limiting structure suitable for forming an optical coupling product according to the utility model.
[0021] Figure 2 It is a front view of a limiting structure suitable for forming an optical coupling product according to the utility model.
[0022] Figure 3 for Figure 2 AA section view.
[0023] Figure 4 for Figure 2 BB cross-sectional view.
[0024] Figure 5 for Figure 3 C enlarged view.
[0025] Figure 6 This is a diagram of the use state of the limiting structure of the utility model in combination with the lead frame. DETAILED DESCRIPTION
[0026] The implementation modes of the present utility model are described in detail below in conjunction with the accompanying drawings.
[0027] like Figures 1 to 6 As shown, a limiting structure suitable for the molding of optocoupler products includes a base 1 and a limiting member 2 arranged on the base 1, the limiting member 2 extends toward a direction away from the base 1 and has at least one limiting pillar 21, and one end of the limiting pillar 21 is provided with a limiting portion 22 for limiting the placement position of the optocoupler product.
[0028] Optionally, in some embodiments, the limiting structure can be made of materials such as metal and plastic. Preferably, metal with high structural strength can be used as the manufacturing material to meet the requirements of resisting strong impact force during the molding process.
[0029] Specifically, in some embodiments, the base 1 is a connecting component and an overall structural base of a limiting structure for installation on a mold. The base 1 is installed on a mold for molding an optocoupler product in a detachable connection manner. The installation position of the base 1 is limited by embedding, snapping, and matching. The base 1 is provided with a limiting member 2 for limiting the placement position of the optocoupler product. The limiting member 2 can be integrally formed with the base 1, or installed on the base 1 in the form of a detachable accessory. The limiting member 2 extends in a direction away from the base 1 and has at least one limiting pillar 21 for supporting the force of molding and punching of the optocoupler product. The number of limiting pillars 21 can be one, two or more, forming a technical effect of single-point support or multi-point support. The limiting pillar 21 can adopt a columnar structure with a horizontal cross-sectional shape such as a rectangle or a circle. The end of the limiting pillar 21 away from the base 1 is provided with a limiting portion 22 for limiting the placement position of the optocoupler product.
[0030] More specifically, the horizontal cross section of the limiting portion 22 is a shape that matches the positioning hole of the optocoupler product, and the horizontal cross section is a shape of the outer side of the cross section parallel to the horizontal plane. The optocoupler product structure includes a pin structure for conducting to the outside world. This pin structure is divided into an inner pin for connecting to internal electronic components and an outer pin for connecting to an external circuit. The inner pin and the outer pin are usually connected together using a transverse rib structure. This transverse rib structure can also be called a middle rib. The term for the transverse rib structure is called DAMBAR. DAMBAR is usually used on a lead frame 6 that can mass-produce the pin structure of an optocoupler product. Multiple pin structures are aligned in series on the same plane through DAMBAR to form a lead frame 6, which is connected between the pin structures. The DAMBAR can be provided with a plurality of positioning grooves 61 for limiting the position of the lead frame 6 along the arrangement direction of the pin structure. The limiting portion 22 can be designed with a corresponding matching shape according to the shape of the positioning groove 61. For example, the positioning groove 61 can be in the shape of a rectangular strip. The horizontal cross-section of the limiting portion 22 can be made into a rectangular strip for matching the shape of the positioning groove 61, so that the limiting member 2 can cooperate with the positioning groove 61 to locate the position of the DAMBAR, thereby avoiding position deviation of the DAMBAR during the molding process, which indirectly affects the position of the PAD and affects the production quality, effectively reduces the scrap rate of the lead frame 6, improves the yield rate of the optocoupler product molding, and improves the product precision and production quality.
[0031] Before use, the limiting structure is installed on the mold through the base 1 at the position corresponding to the positioning groove 61 of the DAMBAR. When in use, the DAMBAR of the lead frame 6 is placed on the mold so that the limiting part 22 is aligned with and passes through the positioning groove 61 to limit the position of the DAMBAR and PAD in the lead frame 6, and the molding process can be carried out.
[0032] like Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, a countersunk through hole 11 for installation is provided in the middle of the base 1 , and the countersunk direction of the countersunk through hole 11 faces the bottom of the base 1 .
[0033] Specifically, in some embodiments, a countersunk through hole 11 for installing the limiting structure on the mold is provided in the middle position of the base 1. The countersunk through hole 11 is a circular sunken hollow structure. The countersunk direction of the countersunk through hole 11 is toward the bottom of the base 1. The countersunk through hole 11 is provided with a countersunk platform in the vertical direction. A through countersunk mounting hole is provided in the middle of the countersunk platform. The cross-sectional diameter of the countersunk platform is larger than the cross-sectional diameter of the countersunk mounting hole. During installation, the user can use screws or bolts to extend from the countersunk through hole 11 toward the side where the countersunk platform is located and pass through the countersunk mounting hole to cooperate with the mold, and lock the base 1 through the countersunk platform to achieve the installation of the limiting structure on the mold.
[0034] like Figure 4 As shown, the horizontal cross-section of the base 1 and / or the limiting member 2 adopts a quadrilateral structure, and the quadrilateral structure includes a first connecting edge and a second connecting edge connected to the first connecting edge, the first connecting edge is greater than or equal to the second connecting edge, and the limiting member 2 is arranged between the second connecting edge and the countersunk through hole 11.
[0035] Specifically, in some embodiments, the horizontal cross-section of the base 1 or the limiter 2 adopts a quadrilateral structure. The production, manufacturing and processing of the quadrilateral column structure is relatively simple and has good force-bearing performance among various shape structures. The quadrilateral structure of the horizontal cross-section of the base 1 includes a first connecting edge, a second connecting edge, a third connecting edge and a fourth connecting edge connected end to end in sequence, wherein the first connecting edge is greater than or equal to the second connecting edge. The quadrilateral structure of the horizontal cross-section of the limiter 2 includes a fifth connecting edge, a sixth connecting edge, a seventh connecting edge and an eighth connecting edge connected end to end in sequence, wherein the fifth connecting edge is greater than or equal to the sixth connecting edge. The limiter 2 is arranged in a position range between the second connecting edge and / or the fourth connecting edge of the base 1 and the countersunk through hole 11. By adopting such a design, the better force-bearing position on the horizontal structure of the base 1 can be effectively utilized as the root force point of the limiter 2. When facing the mold pressure in the vertical direction, the force will not be uneven because the root is in a weak position or side position of the base 1, thereby effectively improving the force at the root connection of the limiter 2.
[0036] Specifically, in some embodiments, the horizontal cross-sections of the base 1 and the limiter 2 can both adopt a quadrilateral structure, so as to further improve the force bearing performance and anti-bending deformation capability of the two.
[0037] like Figure 2 and Figure 4As shown, the quadrilateral structure is a rectangular structure, which includes long sides and short sides of different lengths. The limiting member 2 includes a first limiting member 23 and a second limiting member 24. The first limiting member 23 is close to the short side of one side of the base 1, and the second limiting member 24 is close to the short side of the other side of the base 1. The first limiting member 23 and the second limiting member 24 are symmetrically arranged on both sides of the countersunk through hole 11.
[0038] Specifically, in some embodiments, the quadrilateral structure adopts a rectangular structure as the contour shape of the horizontal cross-section, the rectangular structure of the horizontal cross-section of the base 1 includes a long side a with a longer length and a short side b with a shorter length, the rectangular structure of the horizontal cross-section of the limiter 2 includes a long side c with a longer length and a short side d with a shorter length, the limiter 2 includes a first limiter 23 and a second limiter 24 arranged at different positions of the base 1, the first limiter 23 and the second limiter 24 are consistent in structure and appearance except for the different arrangement positions, and the orientations of the two are also consistent, the first limiter 23 and the second limiter 24 are symmetrically arranged on both sides of the countersunk through hole 11 with respect to the center of the countersunk through hole 11, the first limiter 23 is close to the short side b on one side of the base 1, and the second limiter 24 is close to the short side b on the other side of the base 1, with such a design, the first limiter 23 and the second limiter 24 simultaneously pass through the lead frame 6 to bear the mold pressure, effectively dispersing the force from both sides of the base 1, so that the vibration generated during the molding process is smaller and the overall structure is more stable.
[0039] like Figures 1 to 4 as well as Figure 6 As shown, a clearance step 12 is provided on a side plane of the base 1 facing the limiting member 2 , and the clearance step 12 is arranged on a long side of the base 1 and sinks toward the bottom of the base 1 .
[0040] Specifically, in some embodiments, the inner pins and outer pins of the lead frame 6 may undergo a bending process so that the inner pins and outer pins are bent into sheet metal and form bending structures parallel to each other. The inner pins and outer pins are in different planes. During the molding process of the lead frame 6, the bent inner pins and outer pins have special air avoidance positions on the mold. Therefore, the base 1 also needs to be designed with an air avoidance step 12 specifically for avoiding the bending structure. The air avoidance step 12 is arranged on the long side a on any side of the base 1. The air avoidance step 12 sinks toward the bottom of the base 1 along the extension direction of the DAMBAR to avoid air. When in use, the DAMBAR of the lead frame 6 is placed on the mold so that the limiting portion 22 is aligned with and passes through the positioning groove 61, and the bending structure of the lead frame 6 is placed above the air avoidance step 12, so that the base 1 does not interfere with the bending structure of the lead frame 6 during the molding process, thereby improving the applicability of the limiting structure.
[0041] like Figure 4As shown, the short side of the limiting member 2 is in the same direction as the short side of the base 1 , and the long side of the limiting member 2 is in the same direction as the long side of the base 1 .
[0042] Specifically, in some embodiments, the short side d of the rectangular structure of the horizontal cross-section of the limiter 2 is oriented in the same direction as the short side b of the rectangular structure of the horizontal cross-section of the base 1, and the long side c of the rectangular structure of the horizontal cross-section of the limiter 2 is oriented in the same direction as the long side a of the rectangular structure of the horizontal cross-section of the base 1, so that the length direction of the horizontal cross-section of the limiter 2 is the same as the length direction of the horizontal cross-section of the base 1. At the same time, because the limiter 2 is arranged along the extension direction of the DAMBAR, the length direction of the horizontal cross-section of the base 1 is oriented in the same direction as the extension direction of the DAMBAR. When multiple limiter structures are installed on the mold along the extension direction of the DAMBAR at the same time, the overall force of the lead frame 6 can be changed to be simultaneously exerted on multiple points, and the mold pressure is dispersed to multiple limiters 1, so that the unit force of each limiter 1 becomes smaller, thereby reducing the degree of divergent bending deformation of the DAMBAR during the molding process, and improving the stability and flatness of the lead frame 6.
[0043] like Figure 2 and Figure 4 As shown, the corners of the base 1 and / or the limiting member 2 are provided with chamfered structures for easy installation, and the chamfered structures can be arc corners or straight corners.
[0044] Specifically, in some embodiments, under actual processing conditions, the right-angled inner corners processed at the position in the mold for embedding the limiting structure will usually inevitably have process arc angles. If the corners of the base 1 or the limiting member 2 at the installation position also adopt right angles that have not been chamfered, the corners of the base 1 or the limiting member 2 may collide and interfere with the inner corners of the corners at the position in the mold for embedding the limiting structure, resulting in failure to install or difficulty in installation. Therefore, the vertical corners of the base 1 or the limiting member 2 on the outside in the horizontal direction can adopt a chamfered structure. The vertical corners on the outside in the horizontal direction of the base 1 are provided with a base chamfer 51, and the vertical corners on the outside in the horizontal direction of the limiting member 2 are provided with a pillar chamfer 52. When in use The limiting structure is installed in the mold, and the process arc angle of the mold is avoided by the base chamfer 51. When the limiting member 2 passes through the positioning groove 61 of the DAMBAR, the possible process arc angle of the positioning groove 61 can also be avoided by the support chamfer 52, so that the overall structure will not conflict or interfere during installation. The outer side of the base 1 of the limiting structure can minimize the matching gap with the installation position of the base 1 of the mold to improve the tightness. The limiting structure can be smoothly installed on the mold. The outer side of the limiting member 2 of the limiting structure can minimize the matching gap with the positioning groove 61 of the DAMBAR, and can also smoothly pass through the positioning groove 61 of the DAMBAR to limit the horizontal position of the DAMBAR, thereby improving the applicability of the limiting structure and facilitating user installation.
[0045] like Figure 2 and Figure 5 As shown, the limiting portion 22 is provided with a limiting step 25 on the side facing away from the base 1 for limiting the height position of the optical coupling product, and the limiting steps 25 are symmetrically arranged on both sides of the limiting portion 22 .
[0046] Specifically, in some embodiments, the limiting step 25 is arranged at a position of the limiting portion 22 for limiting the placement height of the lead frame. The limiting step 25 is symmetrically arranged on both sides of the limiting portion 22 with respect to the center of the limiting portion 22. After the limiting portion 22 extends into the positioning groove 61 of the DAMBAR, the positioning groove 61 moves downward until the edge of the positioning groove 61 contacts the limiting step 25, and then the DAMBAR stops moving downward. When subjected to mold pressure, the limiting step 25 can also bear the pressure to reduce the degree of bending deformation of the DAMBAR, so that the DAMBAR can still maintain a relatively flat quality during the molding process. Such a design can improve the molding quality of the DAMBAR and facilitate limiting the placement height of the DAMBAR.
[0047] like Figures 1 to 5 As shown, the limiting step 25 is provided with a guide angle 26 on the side away from the base 1 for facilitating insertion of the optical coupling product. The guide angle 26 forms an acute angle 27 with the top plane of the limiting portion 22, and the angle range of the angle 27 is between 10 and 80 degrees.
[0048] Specifically, in some embodiments, the guide inclination angle 26 is set on the limiting portion 22 to facilitate the placement of the lead frame into the limiting portion 22. Without the inclination angle as a guiding direction, the positioning groove 61 of the DAMBAR will be difficult to place because the clearance with the limiting portion 22 is too small, or it will take more time to align and place it, which has a greater impact on the overall production efficiency. Therefore, a guide inclination angle 26 is set on the limiting portion 22. The guide inclination angle 26 is symmetrically arranged on both sides of the limiting portion 22 with respect to the center of the limiting portion 22 and is located at the corner between the limiting step 25 and the top plane of the limiting portion 22. The guide inclination angle 26 and the limiting step 25 can be on the same side of the limiting portion 22, or on different sides of the limiting portion 22. The guide inclination angle 26 and the limiting step 25 can be on the same side of the limiting portion 22, or on different sides of the limiting portion 22. The top plane of the positioning portion 22 forms an acute angle 27. The angle between the angle 27 and the top plane of the limiting portion 22 affects the smoothness of the DAMBAR positioning groove 61 being inserted into the limiting portion 22. The smaller the angle 27, the greater the resistance of the DAMBAR positioning groove 61 being inserted into the limiting portion 22. The larger the angle 27, the more time it takes to align the DAMBAR positioning groove 61 into the limiting portion 22. Therefore, when the angle range of the angle 27 is controlled between 10 and 80 degrees, the smoothness of the DAMBAR positioning groove 61 being inserted into the limiting portion 22 is relatively ideal. The angle 27 with a certain slope and taper is easier to guide the DAMBAR positioning groove 61 to be inserted, thereby improving the efficiency of the lead frame insertion and positioning.
[0049] like Figure 6 As shown, the mold is characterized in that it includes the limiting structure, and the limiting structure can be detachably installed on the mold.
[0050] Specifically, in some embodiments, the pin structure of the optocoupler product usually uses a mold to perform a series of process steps such as punching, sheet metal, glue pouring, and packaging during the molding process. The mold is one of the indispensable molding tools in the molding process. In order to solve the positioning problem of the lead frame on the mold, the limiting structure can be installed on the mold through the base 1 by adopting a variety of different detachable methods such as embedding, snapping, matching, and magnetic attraction. Through one or more limiting structures, a single-point support or multi-point support is formed, which reduces the degree of bending deformation of the lead frame and improves the molding flatness of the lead frame. There is no need to add other accessories or use other process steps. It can be installed and used immediately, and has a better positioning and anti-deformation effect.
[0051] like Figures 1 to 6 As shown, the specific implementation of Example 1 of the utility model is as follows:
[0052] During installation, the limiting structure is installed on the mold through the base 1 at the position corresponding to the positioning groove 61 of the DAMBAR. The base 1 is installed on the mold through a variety of different detachable methods such as embedding, snapping, matching, and magnetic attraction. The user can use screws or bolts to extend from the countersunk through hole 11 toward the side where the countersunk platform is located and pass through the countersunk mounting hole to match and connect with the mold. The screws or bolts lock the base 1 through the countersunk platform to achieve the installation of the limiting structure on the mold;
[0053] When in use, the DAMBAR of the lead frame 6 is placed on the mold, and a 45-degree angle 27 is formed between the guide angle 26 and the top plane of the limiting portion 22. The limiting structure smoothly extends the limiting portion 22 into the positioning groove 61 through the guide angle 26 until the positioning groove 61 contacts the limiting step 25 and stops. The limiting structures at other positions are also extended into the positioning groove 61 in a similar manner. The bending structure of the lead frame 6 is placed above the avoidance step 12 to limit the position of the DAMBAR and PAD in the lead frame 6. After the lead frame 6 is positioned and stably on the mold, subsequent molding steps can be performed.
[0054] like Figures 1 to 6 As shown, the specific implementation of Example 2 of the utility model is as follows:
[0055] Different from Example 1, the number of the limiting members 2 in this embodiment is 2, and the limiting members 2 include a first limiting member 23 and a second limiting member 24. The first limiting member 23 and the second limiting member 24 are symmetrically arranged on both sides of the countersunk through hole 11. When in use, the DAMBAR of the lead frame 6 is placed on the mold, and the first limiting member 23 and the second limiting member 24 on the limiting structure smoothly extend the limiting portion 22 into the positioning groove 61 through the guide inclination 26 respectively, until the positioning groove 61 contacts the limiting step 25 and stops. The limiting structures at other positions are also similarly extended to extend the first limiting member 23 and the second limiting member 24 into the positioning groove 61 respectively, so as to limit the position of the DAMBAR and the PAD in the lead frame 6. After the lead frame 6 is positioned and stably on the mold, the subsequent molding steps can be carried out.
[0056] The above examples are only used to further illustrate the technical content of the utility model, so that readers can understand it more easily, but it does not mean that the implementation methods of the utility model are limited to this. Any technical extension or re-creation made based on the utility model is protected by the utility model. The protection scope of the utility model shall be based on the claims.
Claims
1. A limiting structure suitable for forming an optical coupler product, characterized in that: The invention comprises a base (1) and a limiting member (2) arranged on the base (1), wherein the limiting member (2) has at least one limiting pillar (21) extending in a direction away from the base (1), and one end of the limiting pillar (21) is provided with a limiting portion (22) for limiting the placement position of an optical coupling product.
2. A limiting structure suitable for forming an optical coupling product according to claim 1, characterized in that: A countersunk through hole (11) for installation is provided in the middle of the base (1), and the countersunk direction of the countersunk through hole (11) faces the bottom of the base (1).
3. A limiting structure suitable for forming an optical coupling product according to claim 2, characterized in that: The horizontal cross-section of the base (1) and / or the limiting member (2) adopts a quadrilateral structure, the quadrilateral structure comprises a first connecting edge and a second connecting edge connected to the first connecting edge, the first connecting edge is greater than or equal to the second connecting edge, and the limiting member (2) is arranged between the second connecting edge and the countersunk through hole (11).
4. The limiting structure suitable for forming an optical coupling product according to claim 3, characterized in that: The quadrilateral structure is a rectangular structure, the rectangular structure comprises long sides and short sides of different lengths, the limiting member (2) comprises a first limiting member (23) and a second limiting member (24), the first limiting member (23) being close to one short side of the base (1), the second limiting member (24) being close to the other short side of the base (1), the first limiting member (23) and the second limiting member (24) being symmetrically arranged on both sides of the countersunk through hole (11), respectively.
5. The limiting structure suitable for forming an optical coupling product according to claim 3, characterized in that: A clearance step (12) is provided on a side plane of the base (1) facing the limiting member (2); the clearance step (12) is arranged on a long side of the base (1) and is sunken toward the bottom of the base (1).
6. The limiting structure suitable for forming an optical coupling product according to claim 4, characterized in that: The short side of the limiting member (2) is in the same direction as the short side of the base (1), and the long side of the limiting member (2) is in the same direction as the long side of the base (1).
7. The limiting structure suitable for forming an optical coupling product according to claim 1, characterized in that: The corners of the base (1) and / or the limiting member (2) are provided with chamfered structures for easy installation, and the chamfered structures can be arc corners or straight corners.
8. The limiting structure suitable for forming an optical coupling product according to claim 1, characterized in that: A limiting step (25) is provided on the side of the limiting portion (22) facing away from the base (1) for facilitating limiting the height position of the optical coupling product, and the limiting step (25) is symmetrically arranged on both sides of the limiting portion (22).
9. The limiting structure suitable for forming an optical coupling product according to claim 8, characterized in that: The limiting step (25) is provided with a guiding angle (26) on the side facing away from the base (1) for facilitating insertion of the optical coupling product, and the guiding angle (26) forms an acute angle (27) with the top plane of the limiting portion (22), and the angle range of the angle (27) is between 10 and 80 degrees.
10. The mold is characterized by: It comprises a limiting structure suitable for molding an optical coupler product as described in any one of claims 1 to 9, wherein the limiting structure can be detachably mounted on the mold.