An optical path coupling test device

Abstract

The present invention provides an optical path coupling test device for testing the optical path coupling of a to-be-tested optical module, which includes a base, an image capture device, and a position adjustment mechanism. Among them, the base is used to place the to-be-tested optical module. The position adjustment mechanism is arranged on the base and is slidably matched with the base. The position adjustment mechanism is connected to the image capture device. The position adjustment mechanism is used to drive the image capture device to move in a three-dimensional space. The image capture device is used to capture images of the fiber optic interfaces of the to-be-tested optical module. The present invention can automatically complete the focusing and positioning of the fiber optic interfaces of the to-be-tested optical module and image capture, thereby effectively improving the test efficiency of the optical path coupling test device and shortening the test time of the optical path coupling test device.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technologies, and in particular, to an optical path coupling test device.

Background Art

[0002] In related technologies, an optical path coupling test device is generally used to test the optical path coupling of a to-be-tested optical module. Among them, the to-be-tested optical module generally includes a laser and an optical lens. When the laser and the optical lens are on the same optical path, it indicates that the optical path coupling of the to-be-tested optical module is completed. The optical path coupling test device generally includes a base and an image capturing device disposed on the base. Among them, the base is used to place the to-be-tested optical module, and the image capturing device is used to capture an image of the fiber optic interface of the to-be-tested optical module. Thus, the effect of the optical path coupling of the to-be-tested optical module can be tested according to the captured image. In practical applications, testers usually need to manually adjust the position of the image capturing device to complete the focusing and positioning with the to-be-tested optical module and image capturing, resulting in a low degree of automation of the optical path coupling test device, and further resulting in a low test efficiency and a long test time of the optical path coupling test device.

[0003] Therefore, it is necessary to improve the structure of the above-mentioned optical path coupling test device.

Summary of the Invention

[0004] The present invention provides an optical path coupling test device, aiming to solve the problems of low test efficiency and long test time of the optical path coupling test device in related technologies.

[0005] To solve the above technical problems, an embodiment of the present invention provides an optical path coupling test device for testing the optical path coupling of a to-be-tested optical module, which includes: a base, an image capturing device, and a position adjusting mechanism. The base is used to place the to-be-tested optical module. The position adjusting mechanism is disposed on the base and is slidably matched with the base. The position adjusting mechanism is connected to the image capturing device, and the position adjusting mechanism is used to drive the image capturing device to move in a three-dimensional space. The image capturing device is used to capture an image of the fiber optic interface of the to-be-tested optical module.

[0006] It can be seen from the above description that, compared with related technologies, the beneficial effects of the present invention are as follows:

[0007] The position adjustment mechanism is arranged on the base, and the position adjustment mechanism is slidably matched with the base; the position adjustment mechanism is connected to the image capture device, and the position adjustment mechanism drives the image capture device to move in three-dimensional space. Based on this, when it is necessary to test the optical path coupling of the to-be-measured optical module, the tester only needs to input relevant commands or parameters, and the position adjustment mechanism will automatically drive the image capture device to move in three-dimensional space to automatically complete the focusing and positioning of the fiber optic interface of the to-be-measured optical module and image capture. Thus, it can be seen that the automation degree of the present invention is higher, so that the test efficiency of the optical path coupling test equipment can be effectively improved, and the test time of the optical path coupling test equipment can be shortened.

Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions in the related art or the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the description of the related art or the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0009] Figure 1 Structural schematic diagram of the first optical path coupling test equipment provided by the embodiment of the present invention;

[0010] Figure 2 Structural schematic diagram of the second optical path coupling test equipment provided by the embodiment of the present invention;

[0011] Figure 3 Exploded view of the second optical path coupling test equipment provided by the embodiment of the present invention;

[0012] Figure 4 Provided by the embodiment of the present invention Figure 3 Partial enlarged view of part A in

[0013] Figure 5 Provided by the embodiment of the present invention Figure 3 Partial enlarged view of part B in

[0014] Figure 6 Structural schematic diagram of the third optical path coupling test equipment provided by the embodiment of the present invention;

[0015] Figure 7 Exploded view of the third optical path coupling test equipment provided by the embodiment of the present invention;

[0016] Figure 8 Provided by the embodiment of the present invention Figure 7 Partial enlarged view of part C in

Detailed Embodiments

[0017] In order to make the objectives, technical solutions, and advantages of the present invention more obvious and understandable, the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention and the corresponding drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. It should be understood that the various embodiments of the present invention described below are only used to explain the present invention and are not used to limit the present invention. That is, based on the various embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] Different from the related art, testers usually need to manually adjust the position of the image capture device to complete the focusing and positioning of the optical module to be tested and image capture, resulting in a low degree of automation of the optical path coupling test equipment, and further resulting in a low test efficiency and a long test time of the optical path coupling test equipment. For this reason, an embodiment of the present invention provides an optical path coupling test equipment.

[0019] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the first optical path coupling test equipment provided by an embodiment of the present invention.

[0020] As Figure 1 shown, an embodiment of the present invention provides an optical path coupling test equipment, including a base 1, an image capture device 2, an optical module 3 to be tested, and a position adjustment mechanism 4. Among them, the optical module 3 to be tested is arranged on the base 1, and the position adjustment mechanism 4 is also arranged on the base 1 and is slidably matched with the base 1 along the first direction x. At the same time, the position adjustment mechanism 4 is also connected to the image capture device 2.

[0021] Specifically, the image capture device 2 is used to capture the image of the fiber optic interface of the optical module 3 to be tested; the position adjustment mechanism 4 is used to drive the image capture device 2 to move along the second direction y, the third direction z, and the first direction x, where the first direction x, the second direction y, and the third direction z are perpendicular to each other in three-dimensional space (which can be analogous to a three-dimensional rectangular coordinate system). It can be understood that the position adjustment mechanism 4 is actually used to drive the image capture device 2 to move in three-dimensional space.

[0022] In practical applications, when it is necessary to test the optical path coupling of the optical module 3 to be tested, the tester can input relevant commands or parameters. After that, the position adjustment mechanism 4 will automatically drive the image capture device 2 to move in the first direction x, the second direction y, and the third direction z to automatically complete the focusing and positioning of the fiber optic interface of the optical module 3 to be tested and image capture.

[0023] In one embodiment, the first direction x may be the length direction of the base 1, and the third direction z may be the width direction of the base 1. Based on this, the second direction y may be the direction away from the base 1 and perpendicular to both the first direction x and the third direction z at the same time. Figure 1 Merely as an example, Figure 1 this setting of the first direction x, the second direction y, and the third direction z is shown). Of course, it is not limited thereto. In other embodiments, the first direction x may also be the width direction of the base 1, and the third direction z may also be the length direction of the base 1. Based on this, the second direction y may be the direction away from the base 1 and perpendicular to both the first direction x and the third direction z at the same time.

[0024] In one embodiment, the image capture device 2 may be a CCD camera. Of course, it is not limited thereto. In other embodiments, the image capture device 2 may also be other devices with image capture functions commonly used in the art.

[0025] It should be understood that the above embodiments are only the preferred implementations of the embodiments of the present invention, and are not the only limitations of the embodiments of the present invention on the type of the image capture device 2 and the selection of the first direction x, the second direction y, and the third direction z. These can all be flexibly set according to the actual application scenario.

[0026] In the embodiment of the present invention, the position adjustment mechanism 4 is arranged on the base 1, and the position adjustment mechanism 4 is slidably engaged with the base 1 along the first direction x; the position adjustment mechanism 4 is connected to the image capture device 2, and the position adjustment mechanism 4 drives the image capture device 2 to move along the second direction y, the third direction z, and the first direction x, wherein the first direction x, the second direction y, and the third direction z are perpendicular to each other in the three-dimensional space. Based on this, when it is necessary to test the optical path coupling of the module 3 to be measured, the tester only needs to input relevant commands or parameters, and the position adjustment mechanism 4 will automatically move the image capture device 2 in the first direction x, the second direction y, and the third direction z to automatically complete the focusing and positioning of the fiber optic interface of the module 3 to be measured and the image capture. It can be seen that the embodiment of the present invention has a higher degree of automation, thereby effectively improving the test efficiency of the optical path coupling test equipment and shortening the test time of the optical path coupling test equipment.

[0027] Please further refer to Figures 2 to 5 , Figure 2 which is a schematic structural diagram of the second optical path coupling test equipment provided by the embodiment of the present invention, Figure 3 which is an exploded schematic diagram of the second optical path coupling test equipment provided by the embodiment of the present invention, Figure 4 which is provided by the embodiment of the present invention Figure 3 a partial enlarged view of part A inFigure 5 Provided by an embodiment of the present invention Figure 3 The partial enlarged view at position B in

[0028] In one embodiment, as Figure 2 and Figure 3 shown, the position adjusting mechanism 4 may include a control box 41, a first guide rod 42 extending along the second direction y, and a second guide rod 43 extending along the third direction z. Wherein, the end of the first guide rod 42 may be disposed on the base 1 and may be slidably engaged with the base 1 along the first direction x. The end of the second guide rod 43 may be sleeved on the first guide rod 42 and may be slidably engaged with the first guide rod 42 along the second direction y. The image capturing device 2 may be connected to the second guide rod 43 and may be slidably engaged with the second guide rod 43 along the third direction z. The control box 41 may be sleeved on the first guide rod 42.

[0029] Specifically, the control box 41 may be used to control the sliding of the first guide rod 42 along the first direction x, the sliding of the second guide rod 43 along the second direction y, and the sliding of the image capturing device 2 along the third direction z. It can be understood that when the image capturing device 2 needs to move in the first direction x, only the first guide rod 42 can be controlled to slide relative to the base 1 in the first direction x. When the image capturing device 2 needs to move in the second direction y, only the second guide rod 43 can be controlled to slide relative to the first guide rod 42 in the second direction y. When the image capturing device 2 needs to move in the third direction z, only the image capturing device 2 can be controlled to slide relative to the second guide rod 43 in the third direction z. Thus, through the cooperation between the control box 41, the first guide rod 42, the second guide rod 43, and the image capturing device 2, the movement of the image capturing device 2 in the three-dimensional space can be easily realized.

[0030] For the control box 41, since it is used to control the sliding of the first guide rod 42 along the first direction x, the sliding of the second guide rod 43 along the second direction y, and the sliding of the image capturing device 2 along the third direction z, it necessarily needs to include common driving and control devices in the art, such as a power source, control buttons, data interfaces, and related control circuits, etc. The embodiments of the present invention will not list them one by one here.

[0031] In addition, for the position of the control box 41, it is not actually limited to being sleeved on the first guide rod 42. In other embodiments, the control box 41 may also be sleeved on the second guide rod 43, or may be directly disposed on the base 1.

[0032] Furthermore, in combination with Figure 4 and Figure 5, in order to achieve the sliding of the first guide rod 42 relative to the base 1 in the first direction x, the base 1 may have a first sliding groove 11 extending in the first direction x. Based on this, the end of the first guide rod 42 may be disposed in the first sliding groove 11 and may be in sliding fit with the first sliding groove 11.

[0033] Of course, it is not limited to this. In other embodiments, the first sliding groove 11 may have a side groove wall 111, and the side groove wall 111 may form a second sliding groove 1111 recessed into the interior of the base 1; correspondingly, the end of the first guide rod 42 may form a sliding portion 421 extending in a direction away from the first guide rod 42. Based on this, the end of the first guide rod 42 may be disposed in the first sliding groove 11, and the sliding portion 421 may be disposed in the second sliding groove 1111 and may be in sliding fit with the second sliding groove 1111.

[0034] It should be noted that the structural form for achieving the sliding of the image capture device 2 relative to the second guide rod 43 in the third direction z may adopt the same or similar structural form as the above structural form for achieving the sliding of the first guide rod 42 relative to the base 1 in the first direction x.

[0035] Furthermore, in order to ensure the accuracy when the first guide rod 42 slides relative to the base 1 in the first direction x, the base 1 may further have a scale 5 extending in the first direction x, and the scale 5 may be located on one side of the first sliding groove 11. It can be understood that when the first guide rod 42 slides relative to the base 1 in the first direction x, the scale 5 will be used as a reference.

[0036] In addition, since it is necessary to test the coupling effect of the optical path coupling of the optical module 3 to be measured according to the image of the optical fiber interface of the optical module 3 to be measured captured by the image capture device 2, it is inevitable to output the image of the optical fiber interface of the optical module 3 to be measured captured by the image capture device 2 for the tester to view. Therefore, the optical path coupling test device provided by the embodiments of the present invention may further include a display screen 6 communicatively connected to the image capture device 2 for receiving and displaying the image of the optical fiber interface of the optical module 3 to be measured captured by the image capture device 2; wherein, one end of the display screen 6 may be sleeved on the first guide rod 42.

[0037] Of course, it is not limited to this. In other embodiments, in addition to being communicatively connected to the image capture device 2, the display screen 6 may also be communicatively connected to the control box 41 at the same time to display some control data of the control box 41, or when the display screen 6 is a touch display screen, some control parameters of the control box 41 may be set through the display screen 6.

[0038] Regarding the position of the display screen 6, it is not actually limited to being sleeved on the first guide rod 42. In other embodiments, the display screen 6 can also be sleeved on the second guide rod 43, or it can be directly disposed on the base 1.

[0039] It should be understood that the above embodiments are only the preferred implementations of the embodiments of the present invention, and are not the only limitations of the embodiments of the present invention on the composition and structure of the control box 41, the structural form of the sliding fit between the first guide rod 42 and the base 1, and the type and position of the display screen 6, etc. These can all be flexibly set according to the actual application scenario.

[0040] Please further refer to Figure 6 、 Figure 7 and Figure 8 , Figure 6 FIG. 14 is a schematic structural diagram of a third optical path coupling test device provided by an embodiment of the present invention, Figure 7 FIG. 15 is an exploded schematic diagram of a third optical path coupling test device provided by an embodiment of the present invention, Figure 8 FIG. 16 is a partial enlarged view of the position C in FIG. 14 provided by an embodiment of the present invention. Figure 7

[0041] In one embodiment, as shown in FIG. 14, the optical path coupling test device provided by the embodiment of the present invention may further include a dispersion prism 7. The dispersion prism 7 can be disposed on the base 1 and can be located on one side of the optical fiber interface of the optical module 3 to be measured; at this time, the image of the optical fiber interface of the optical module 3 to be measured is no longer directly captured by the image capturing device 2, but is first reflected by the dispersion prism 7 and then captured by the image capturing device 2, that is, the image capturing device 2 captures the image of the optical fiber interface of the optical module 3 to be measured reflected by the dispersion prism 7. Figure 6

[0042] It can be understood that since the dispersion prism 7 needs to reflect the image of the optical fiber interface of the optical module 3 to be measured, the dispersion prism 7 necessarily needs to be tilted at a certain angle in actual application, such as 45°, 55°, and 60°, etc.

[0043] Optionally, the dispersion prism 7 can be a triangular prism. Of course, it is not limited thereto. In other embodiments, the dispersion prism 7 can also be other optical prisms with reflection functions commonly used in the art, such as Belling-Brock prism, Abbe prism, and Amici prism, etc.

[0044] Further, in combination with FIG. 14 Figure 7 ​​, To ensure the stability of the optical module 3 to be measured and the dispersion prism 7 relative to the base 1, the optical path coupling test device provided by the embodiment of the present invention may further include a carrier plate 8, and the base 1 may have a first accommodation groove 12 for accommodating the carrier plate 8; the carrier plate 8 may have a second accommodation groove 81 for accommodating the optical module 3 to be measured and a card slot 82 for placing the dispersion prism 7. Based on this, in practical applications, the carrier plate 8 can be arranged in the first accommodation groove 12, the optical module 3 to be measured can be arranged in the second accommodation groove 81, and the dispersion prism 7 can be arranged in the card slot 82 to ensure the stability of the optical module 3 to be measured and the dispersion prism 7 relative to the base 1. It can be understood that since the dispersion prism 7 needs to reflect the image of the fiber optic interface of the optical module 3 to be measured, the card slot 82 for placing the dispersion prism 7 and the second accommodation groove 81 for accommodating the optical module 3 to be measured must be correspondingly arranged.

[0045] Optionally, the inner walls of the second accommodation groove 81 and the card slot 82 can be covered with an anti-slip layer (not shown in the figure), such as a rubber layer, to prevent the optical module 3 to be measured from sliding or shifting relative to the second accommodation groove 81, and the dispersion prism 7 from sliding or shifting relative to the card slot 82. Specifically, taking the anti-slip layer as a rubber layer as an example, the anti-slip layer on the inner wall of the second accommodation groove 81 can be made of a rubber material with strong adsorption, and the anti-slip layer on the inner wall of the card slot 82 can be made of a rubber material with strong elasticity.

[0046] Furthermore, to enhance the stability of the carrier plate 8 relative to the base 1, the first accommodation groove 12 may have a bottom wall 121, and the bottom wall 121 may form a plurality of fixing portions 1211 extending towards the carrier plate 8; correspondingly, the carrier plate 8 may have a plurality of fixing holes 83 respectively inserted and matched with the plurality of fixing portions 1211. Based on this, when the carrier plate 8 is arranged in the first accommodation groove 12, each fixing portion 1211 will be respectively inserted into each fixing hole 83 to enhance the stability of the carrier plate 8 relative to the base 1.

[0047] For the distribution form of the fixing portions 1211, an interspersed distribution form can be adopted, or a mutually abutting distribution form can be adopted, or a combination of these two distribution forms can be adopted; the same is true for the distribution form of the fixing holes 83.

[0048] Furthermore, combined with Figure 8 , to improve the versatility of the optical path coupling test device provided by the embodiment of the present invention, so that it can be applicable to optical modules 3 to be measured of different models and sizes, a plurality of second accommodation grooves 81 and card slots 82 can be correspondingly arranged. At this time, the plurality of second accommodation grooves 81 can be respectively used to accommodate optical modules 3 to be measured of different models and sizes.

[0049] On this basis, a plurality of second accommodating grooves 81 can be respectively arranged on opposite sides of the carrier plate 8 to form two opposite columns of second accommodating grooves 81; at the same time, the carrier plate 8 can have a blocking portion 84 extending away from the base 1 and located between the two columns of second accommodating grooves 81, and a plurality of protruding portions 841 extending away from the blocking portion 84 and spaced apart from each other can be formed on opposite sides of the blocking portion 84. At this time, the blocking portion 84 and any two adjacent protruding portions 841 on the same side of the blocking portion 84 can enclose to form a clamping groove 82.

[0050] In addition, although there are a plurality of clamping grooves 82, the dispersion prism 7 can include only one, and of course, it can also include a plurality. Importantly, when a plurality of second accommodating grooves 81 and clamping grooves 82 are correspondingly arranged, and after the position adjusting mechanism 4 automatically drives the image capturing device 2 to focus on and capture the image of the fiber optic interface of the optical module 3 to be tested located in a certain second accommodating groove 81, the position adjusting mechanism 4 can directly translate to the next second accommodating groove 81 to capture the image of the fiber optic interface of the optical module 3 to be tested in the next second accommodating groove 81, without having to perform repeated focusing on the fiber optic interface of the optical module 3 to be tested in the next second accommodating groove 81. This will greatly reduce the test time of the optical path coupling test equipment, and the test efficiency of the optical path coupling test equipment will also be improved accordingly.

[0051] It should be understood that the above embodiments are only the preferred implementations of the embodiments of the present invention, and are not the only limitations of the embodiments of the present invention on the tilt angle, type, quantity of the dispersion prism 7, the type of the anti-slip layer, the distribution form of each fixing portion 1211 and each fixing hole 83, and the quantity, structure, etc. of the second accommodating groove 81 and the clamping groove 82. These can all be flexibly set according to the actual application scenarios.

[0052] It should be noted that the various embodiments in the content of the present invention are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0053] It should also be noted that in the present disclosure of the invention, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements that are inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus that comprises the element.

[0054] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present disclosure of the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure of the invention. Therefore, the present disclosure of the invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An optical path coupling test device is used to test the optical path coupling of a to-be-tested optical module. Characterized in that, the optical path coupling test device includes: a base, an image capture device, a position adjustment mechanism, and a dispersion prism. The base is used to place the to-be-tested optical module. The position adjustment mechanism is arranged on the base and is slidably matched with the base. The position adjustment mechanism is connected to the image capture device. The position adjustment mechanism is used to drive the image capture device to move in a three-dimensional space. The image capture device is used to capture an image of the fiber optic interface of the to-be-tested optical module. The dispersion prism is used to reflect the image of the fiber optic interface. The image capture device is used to capture the image of the fiber optic interface reflected by the dispersion prism. The base has a first accommodation groove. The optical path coupling test device further includes a carrier plate. The carrier plate is arranged in the first accommodation groove. The carrier plate has a second accommodation groove for accommodating the to-be-tested optical module, and a card slot for placing the dispersion prism and corresponding to the second accommodation groove. There are multiple second accommodation grooves corresponding to the card slots. The multiple second accommodation grooves are respectively used to accommodate different models of the to-be-tested optical modules. Wherein, the position adjustment mechanism includes: a control box, a first guide rod, and a second guide rod. The end of the first guide rod is arranged on the base and is slidably matched with the base. The end of the second guide rod is sleeved on the first guide rod and is slidably matched with the first guide rod. The image capture device is connected to the second guide rod and is slidably matched with the second guide rod. The control box is sleeved on the first guide rod. The control box is used to control the sliding of the first guide rod relative to the base, the sliding of the second guide rod relative to the first guide rod, and the sliding of the image capture device relative to the second guide rod.

2. The optical path coupling test device according to claim 1, Characterized in that, the base has a first chute. The first chute extends along the sliding direction of the first guide rod relative to the base. The end of the first guide rod is arranged in the first chute and is slidably matched with the first chute. Or, the base has a first chute. The first chute extends along the sliding direction of the first guide rod relative to the base. The first chute has a side chute wall. The side chute wall forms a second chute recessed towards the inside of the base. The end of the first guide rod forms a sliding part extending in a direction away from the first guide rod. The end of the first guide rod is arranged in the first chute. The sliding part is arranged in the second chute and is slidably matched with the second chute.

3. The optical path coupling test device according to claim 2, Characterized in that, the base further has a scale. The scale is located on one side of the first chute. The scale extends along the sliding direction of the first guide rod relative to the base.

4. The optical path coupling test device according to claim 3, Characterized in that, It further includes a display screen that is communicatively connected to both the image capture device and the control box, and one end of the display screen is sleeved on the first guide rod.

5. The optical path coupling test device according to claim 1, characterized in that the first accommodation groove has a bottom groove wall, and a plurality of fixing portions extending in the direction of the carrier plate are formed on the bottom groove wall; the carrier plate has a plurality of fixing holes, and the plurality of fixing holes are respectively inserted and matched with the plurality of fixing portions.

6. The optical path coupling test device according to claim 1, characterized in that a plurality of the second accommodation grooves are respectively arranged on opposite sides of the carrier plate to form two opposite columns of the second accommodation grooves. The carrier plate has a blocking portion extending away from the base, and the blocking portion is located between the two columns of the second accommodation grooves. A plurality of protruding portions extending away from the blocking portion and spaced apart from each other are formed on both opposite sides of the blocking portion. The blocking portion and any two adjacent protruding portions on the same side of the blocking portion enclose to form the card slot.

Images