Housing and PCB fixing structure and 800G OSFP optical module

Abstract

The utility model relates to a fixing structure of a shell and a PCB (printed circuit board), which comprises a lower shell and the PCB arranged in an inner cavity of the lower shell, a positioning groove is respectively arranged at the edges of two sides close to a golden finger in the length direction of the PCB, and a positioning column which is arranged in the positioning groove and is matched with the positioning groove is respectively arranged in the inner cavity of the lower shell corresponding to each positioning groove. At least one rib position for forming transition fit between the PCB and the lower shell is arranged between each side face in the length direction of the PCB and the cavity wall of the inner cavity of the lower shell, and at least one rib position for forming transition fit between the PCB and the positioning column is arranged between the side face of the positioning column and the groove wall of the positioning groove in the PCB. The 800G OSFP optical module comprises the housing and the PCB fixing structure. The beneficial effects are that the consistency of the relative positions of the PCB and the lower shell is improved, the position of a PCB golden finger and the position of a reed contact in a connector of a switch are prevented from being relatively discrete, and the stability of signals is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical module technical field, concretely relates to a shell and PCB board fixed structure and 800G OSFP optical module. BACKGROUND

[0002] The signal transmission rate of 800G OSFP encapsulated optical module reaches 100Gbps, and the optical module and the switch adopt the hot plug mode, that is, the golden finger of the PCB board in the optical module is inserted into the connector in the cage of the switch, and the transmission of electrical signals is realized by making the golden finger contact with the reed of the connector, and under normal circumstances, the contact point of the reed and the golden finger is in the middle of the golden finger, and the tail part of the golden finger has an end reflection problem, and the reflected signal can damage the signal quality of the optical module, and the higher the signal rate, the greater the influence of reflection on signal quality.

[0003] The fixing mode of the PCB board and the lower shell in the existing 800G OSFP optical module is as follows:

[0004] The PCB board is placed in the inner cavity of the lower shell, a positioning groove is formed at each lengthwise side edge of the PCB board, each positioning groove is adjacent to the golden finger, and a positioning column that is in the positioning groove and matched with the positioning groove is arranged in the inner cavity of the lower shell corresponding to each positioning groove, in the design scheme, in order to avoid the assembly interference between the lower shell and the PCB board, the lower shell and the PCB board adopt the gap fit scheme, and due to the influence of the machining tolerance, the relative position consistency of the PCB board and the lower shell is poor, for example, the width of the positioning column is 2.85+ / -0.05mm, the width of the positioning groove is 3.1+ / -0.1mm, and the maximum gap of one side reaches (3.1-2.8)÷2=0.15mm, and the gap will cause the PCB board to shake in the lower shell, so that the contact position of the golden finger of the PCB board and the reed in the connector of the switch is relatively discrete, the end reflection of the golden finger after different optical modules are inserted into the switch is also relatively discrete, and the unstable reflected signal can affect the stable transmission of the signal with a single channel rate of 100Gbps, thereby causing poor compatibility of the optical module and the switch. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that a shell and a PCB board fixing structure and an 800G OSFP optical module are provided to overcome the shortcomings of the prior art.

[0006] The technical scheme for solving the above technical problem is as follows:

[0007] A shell and PCB board fixing structure includes: a lower shell and a PCB board placed in the inner cavity of the lower shell. A positioning groove is formed on each of the two edges near the gold fingers along the length direction of the PCB board. A positioning post is provided in the inner cavity of the lower shell corresponding to each positioning groove and matching it. At least one rib is provided between each side of the PCB board along the length direction and the cavity wall of the inner cavity of the lower shell to form a transition fit between the PCB board and the lower shell. At least one rib is provided between the side of the positioning post and the groove wall of the positioning groove on the PCB board to form a transition fit between the PCB board and the positioning post.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the ribs are wedge-shaped.

[0010] Furthermore, the upper end of the rib is cut downwards at an angle to form an oblique guide surface facing the PCB board.

[0011] Furthermore, each side of the PCB board along its length is provided with a rib at its tail end between the PCB board and the cavity wall of the lower shell, so as to form a transition fit between the PCB board and the lower shell.

[0012] Furthermore, the ribs between the side of the PCB board and the inner wall of the lower shell are fixed to the inner wall of the lower shell.

[0013] Furthermore, a rib is provided between the side of the positioning post near the gold finger of the PCB board and the groove wall of the positioning groove on the PCB board, and between the side of the positioning post away from the gold finger of the PCB board and the groove wall of the positioning groove on the PCB board, so as to form a transition fit between the PCB board and the positioning post.

[0014] Furthermore, the ribs between the side of the positioning post near the gold finger of the PCB board and the groove wall of the positioning groove on the PCB board, and between the side of the positioning post away from the gold finger of the PCB board and the groove wall of the positioning groove on the PCB board, are respectively fixed to the side of the positioning post.

[0015] Furthermore, the side of the positioning post adjacent to the PCB board is an arc-shaped surface, and the surface of the positioning groove opposite to the arc-shaped surface on the positioning post is also an arc-shaped surface.

[0016] Furthermore, an upper shell is assembled on the lower shell, and a threaded hole is opened downward on the upper surface of the positioning post. The lower shell and the upper shell are fastened together by screws, and the screws are threaded into the threaded hole on the positioning post.

[0017] The beneficial effects of this utility model are as follows: By introducing ribs at corresponding positions, when the PCB board is installed into the lower shell 1, the ribs enable a transition fit between the PCB board and the lower shell, as well as between the PCB board and the positioning post. This allows for assembly even if there is a certain interference fit between the lower shell and the PCB board after manufacturing, preventing excessive PCB board movement within the lower shell and improving the consistency of the relative positions of the PCB board and the lower shell. This also prevents the gold fingers of the PCB board from being too dispersed with the spring contacts inside the connector of the switch, ensuring signal stability.

[0018] Based on the above technical solution, this utility model also provides an 800G OSFP optical module, including the aforementioned housing and PCB board fixing structure.

[0019] The further beneficial effect of adopting the above is that it effectively ensures the compatibility between optical modules and switches. Attached Figure Description

[0020] Figure 1 This is an assembly drawing of the lower shell and PCB board of this utility model;

[0021] Figure 2 This is an exploded view of the lower shell and PCB board of this utility model;

[0022] Figure 3 This is a structural diagram of the lower shell of this utility model;

[0023] Figure 4 for Figure 2 A magnified view of a portion of the image;

[0024] Figure 5 This is an assembly drawing of the fixing structure between the outer shell and the PCB board in this utility model;

[0025] Figure 6 This is an exploded view of the 800G OSFP optical module in this utility model;

[0026] Figure 7 This is a first-person view of the electromagnetic shielding structure in the explosion state of this utility model;

[0027] Figure 8 This is a second-view diagram of the electromagnetic shielding structure in the explosion state of this utility model;

[0028] Figure 9 This is a cross-sectional view of the electromagnetic shielding structure in the width direction of this utility model;

[0029] Figure 10 This is a cross-sectional view of the electromagnetic shielding structure in the present invention along its length.

[0030] Figure 11 This is a first-view structural diagram of the outer shell of this utility model;

[0031] Figure 12 This is a second-view structural diagram of the outer shell of this utility model;

[0032] Figure 13 This is an exploded view of the outer shell of this utility model;

[0033] Figure 14 This is an assembly drawing of the outer shell and the pull ring in this utility model;

[0034] Figure 15 This is an exploded view of the outer shell and pull ring in this utility model;

[0035] Figure 16 This is a cross-sectional view of the cage in this utility model.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Lower shell, 110. Rib, 120. Second retaining wall, 121. First gap, 130. First cavity, 140. Second cavity, 150. Assembly slot, 151. Second mating surface, 160. First mating surface, 170. Groove, 180. Positioning post, 181. Threaded hole, 2. Upper shell, 210. Glue groove, 220. First retaining wall, 221. Second gap, 230. Third retaining wall, 240. Stroke groove, 3. PCB board, 4. Pull ring, 410. Unlocking arm, 411. Protrusion, 412. Unlocking block, 5. Cage, 510. Stop, 520. Tongue, 6. Rib, 610. Angled guide surface, 7. Screw. Detailed Implementation

[0038] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0039] Example 1

[0040] like Figures 1-4As shown, a shell and PCB board fixing structure includes: a lower shell 1 and a PCB board 3. The PCB board 3 is placed in the inner cavity of the lower shell 1. A positioning groove 310 is formed on each of the two sides along the length direction of the PCB board 3. Each positioning groove 310 is adjacent to the gold fingers. A positioning post 180 is provided in the inner cavity of the lower shell 1 corresponding to each positioning groove 310 and matching it. At least one rib 6 is provided between each side of the PCB board 3 along the length direction and the cavity wall of the inner cavity of the lower shell 1. The ribs 6 between the side of the PCB board 3 and the cavity wall of the inner cavity of the lower shell 1 make the PCB board 3 and the lower shell 1 form a transition fit. At least one rib 180 is provided between the side of the positioning post 180 and the groove wall of the positioning groove 310 on the PCB board 3. Rib 6, located between the side of the positioning post 180 and the wall of the positioning groove 310 on the PCB board 3, allows the PCB board 3 and the positioning post 180 to form a transition fit. In this design, rib 6 is introduced at the corresponding position. When the PCB board 3 is installed into the lower shell 1, the rib 6 forms a transition fit between the PCB board 3 and the lower shell 1, as well as between the PCB board 3 and the positioning post 180. This allows for assembly even if there is a certain interference fit between the lower shell 1 and the PCB board 3 after manufacturing, preventing excessive shaking of the PCB board 3 within the lower shell 1 and improving the consistency of the relative positions of the PCB board 3 and the lower shell 1. This also prevents the gold fingers of the PCB board 3 from being too dispersed with the spring contacts inside the connector of the switch, ensuring signal stability.

[0041] Example 2

[0042] like Figure 3 As shown, this embodiment is a further improvement on embodiment 1, as detailed below:

[0043] The rib 6 is preferably wedge-shaped. As a further optimization of this scheme, the upper end of the rib 6 is obliquely cut downward to form an oblique guide surface 610 facing the PCB board 3. Through the oblique guide surface 610, the PCB board 3 can be assembled into place with just a light press.

[0044] Example 3

[0045] like Figure 1 , Figure 2 , Figure 3 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below:

[0046] Each side of the PCB board 3 along its length is provided with a rib 6 at its tail end between the PCB board 3 and the inner wall of the lower shell 1 to form a transition fit between the PCB board 3 and the lower shell 1. The rib 6 between the side of the PCB board 3 and the inner wall of the lower shell 1 is preferably fixed to the inner wall of the lower shell 1.

[0047] Example 4

[0048] like Figures 1-4 As shown, this embodiment is a further improvement on embodiment 1, 2, or 3, as detailed below:

[0049] A rib 6 is provided between the side of the positioning post 180 near the gold finger of the PCB board 3 and the groove wall of the positioning groove 310 on the PCB board 3, and between the side of the positioning post 180 away from the gold finger of the PCB board 3 and the groove wall of the positioning groove 310 on the PCB board 3, so as to form a transition fit between the PCB board 3 and the positioning post 180. The ribs 6 between the side of the positioning post 180 near the gold finger of the PCB board 3 and the groove wall of the positioning groove 310 on the PCB board 3, and between the side of the positioning post 180 away from the gold finger of the PCB board 3 and the groove wall of the positioning groove 310 on the PCB board 3, are preferably fixed to the side of the positioning post 180.

[0050] Example 5

[0051] like Figures 1-4 As shown, this embodiment is a further improvement on any one of embodiments 1 to 4, as detailed below:

[0052] The side of the positioning post 180 adjacent to the PCB board 3 is an arc-shaped surface, and the surface of the positioning groove 310 opposite to the arc-shaped surface of the positioning post 180 is also an arc-shaped surface.

[0053] Example 6

[0054] like Figure 5 As shown, this embodiment is a further improvement on any one of embodiments 1 to 5, as detailed below:

[0055] An upper shell 2 is assembled on the lower shell 1. As a common solution, a threaded hole 181 is opened downward on the upper surface of the positioning post 180. The lower shell 1 and the upper shell 2 are fastened together by screws 7. The screws 7 are threadedly connected to the threaded hole 181 on the positioning post 180, without the need to design an additional screw fixing post.

[0056] Example 7

[0057] like Figure 6 As shown, an 800G OSFP optical module includes a housing and PCB board fixing structure as described in any one of embodiments 1 to 6, which effectively ensures the compatibility between the optical module and the switch.

[0058] like Figures 7-10 As shown, as a further optimization of the above scheme, its electromagnetic shielding structure is improved:

[0059] Ribs 110 are provided on the upper surface of the lower shell 1 in the area corresponding to the PCB board 3 on both sides of the inner cavity. A glue groove 210 is provided on the lower surface of the upper shell 2. The position and shape of the glue groove 210 match the position and shape of the ribs 110. EMI glue is provided in the glue groove 210. When the upper shell 2 is assembled on the lower shell 1, the ribs 110 on the lower shell 1 enter the glue groove 210 and compact the EMI glue in the glue groove 210. A first baffle 220 is provided on the lower surface of the upper shell 2 to enter the inner cavity of the lower shell 1. The first baffle 220 on the lower surface of the upper shell 2 is distributed along the direction of the glue groove 210. The outer side of the first baffle 220 is preferably coplanar with the inner groove surface of the glue groove 210.

[0060] When the reinforcing bar 110 enters the glue tank 210 and compacts the EMI glue in the glue tank 210, a seal is achieved to prevent electromagnetic wave leakage. Since the first baffle 220 enters the inner cavity of the lower shell 1, it forms a reverse stop with the lower shell 1, which can also improve the electromagnetic shielding effectiveness. This electromagnetic shielding structure can achieve double shielding of electromagnetic radiation, improve the shielding effect between the lower shell 1 and the upper shell 2, and avoid the position of the PCB board 3, so as not to occupy the layout space of the PCB board 3.

[0061] The tail ends of the ribs 110 on both sides of the inner cavity on the upper surface of the lower shell 1 are outside the tail end of the PCB board 3. The front ends of the ribs 110 on both sides of the inner cavity on the upper surface of the lower shell 1 are close to the gold fingers of the PCB board 3, which can cover the section of the PCB board 3 inside the lower shell 1 and the upper shell 2, effectively preventing electromagnetic wave leakage.

[0062] The inner cavity of the lower shell 1 is provided with a second baffle 120 distributed along its width direction. The inner cavity of the lower shell 1 is divided into a first cavity 130 and a second cavity 140 by the second baffle 120. The first cavity 130 and the second cavity 140 are used to accommodate the PCB board 3 and the ferrule, respectively. Two first slits 121 are opened vertically on the second baffle 120 for optical fibers to pass through. Since the first slits 121 are only for optical fibers to pass through, the second baffle 120 can form a barrier to improve the electromagnetic shielding performance.

[0063] Ribs 110 are provided on the upper surface of the lower shell 1 on both sides of the first cavity 130 and on the upper surface of the second baffle 120. At this time, the ribs 110 are U-shaped. Since the ribs 110 cooperate with the glue groove 210, the glue groove 210 is also U-shaped, forming a barrier in the other three directions of the PCB board 3 except for the gold finger end, thus improving the electromagnetic shielding efficiency.

[0064] The U-shaped end of the first barrier wall 220 is provided with a vertically distributed second gap 221 at each corresponding first gap 121. The lower surface of the upper shell 2 is provided with a third barrier wall 230 at the opening end of the first barrier wall 220, and the lower surface of the third barrier wall 230 can be attached to the PCB board 3. The third barrier wall 230 can also form a barrier to the PCB board 3, thereby improving the electromagnetic shielding effectiveness.

[0065] like Figures 11-16 As shown, as a further optimization of the above solution, its outer shell structure is improved:

[0066] The outer shell is assembled from a lower shell 1 and an upper shell 2. By designing a first baffle 220 on the lower surface of the upper shell 2 that enters the inner cavity of the lower shell 1, it can be ensured that even if the thickness of the upper shell 2's edge (i.e., the thickness of the area overlapping with the edge of the lower shell 1) is reduced, the upper shell 2 is not easily deformed, thus increasing the thickness of the lower shell 1. Therefore, the parting line between the upper shell 2 and the lower shell 1 will be higher. An assembly groove 150 is formed on each of the two sides of the lower shell 1 along its length. Because the thickness of the lower shell 1 increases, the height of the assembly groove 150 increases. The assembly groove 150 penetrates the upper surface and the tail end face of the lower shell 1. This is a common form and will not be described in detail here. The two unlocking arms 410 of the pull ring 4 slide in engagement with the assembly grooves 150 on the two sides of the lower shell 1. In this design, the structure of the pull ring 4 remains unchanged. The assembly groove 150 has a second mating surface 151 for abutting against the two tongues 520 of the cage 5. The unlocking arm 410, under the elastic force of the return spring, has its front end abut against the second mating surface 151 of the mounting groove 150. The upper end of the second mating surface 151 is higher than the higher-positioned tongue 520 of the two tongues 520, and the lower end of the second mating surface 151 is lower than the lower-positioned tongue 520 of the two tongues 520. The front end of the lower shell 1 has a first mating surface 160 on both sides of the inner cavity for abutting against the stop 510 of the cage 5. The lower shell 1 is used to abut against the stop 510 of the cage 5. The distance between the first mating surface 160 and the second mating surface 151 of the assembly groove 150, which abuts against the tongue 520 of the cage 5, is 44.59±0.08mm. Furthermore, due to the above structural design adopted in this solution, the distance between the first mating surface 160 and the second mating surface 151 of the lower shell 1, which abuts against the stop 510 of the cage 5, is 44.59±0.05mm, which is better than the agreed size.

[0067] When the 800G OSFP optical module is inserted into the cage to a predetermined length, the stop 510 of the cage 5 will abut against the first mating surface 160 of the lower shell 1. The lower tongue 520 and the higher tongue 520 abut against the second mating surfaces 151 of the two mounting slots 150 respectively. Since the lower tongue 520 and the higher tongue 520 abut against the two second mating surfaces 151 of the same lower shell 1 and do not abut against the upper shell 2, even if there is a difference in the assembly steps between the lower shell 1 and the upper shell 2, it will not affect the consistency of the mating dimensions, thereby ensuring signal quality.

[0068] The height of the first retaining wall 220 shall not be less than 1.5mm, and the width of the first retaining wall 220 shall not be less than 0.5mm. Of course, the size shall not be too large, so as not to occupy the PCB layout space, and at the same time not to affect the installation of the PCB board.

[0069] The lower surface of the upper shell 2 has a travel groove 240 on each side along the length direction, and the protrusions 411 on the two unlocking arms 410 respectively enter the two travel grooves 240 on the lower surface of the upper shell 2. By allowing the protrusions 411 to enter the travel grooves 240, the unlocking arms 410 are effectively prevented from falling off the shell. The second mating surface 151 has a groove 170 in the middle area for the unlocking block 412 of the unlocking arm 410 to fully enter.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A structure for fixing a housing to a PCB board, comprising: The lower shell (1) and the PCB board (3) placed in the inner cavity of the lower shell (1) are provided with a positioning groove (310) on each side edge near the gold finger in the length direction of the PCB board (3). A positioning post (180) is provided in the inner cavity of the lower shell (1) corresponding to each positioning groove (310) and matched therewith. The feature is that at least one rib (6) is provided between each side of the PCB board (3) in the length direction and the cavity wall of the inner cavity of the lower shell (1) to make the PCB board (3) and the lower shell (1) form a transition fit. At least one rib (6) is provided between the side of the positioning post (180) and the groove wall of the positioning groove (310) on the PCB board (3) to make the PCB board (3) and the positioning post (180) form a transition fit.

2. The shell and PCB board fixing structure according to claim 1, characterized in that, The rib (6) is wedge-shaped.

3. A shell and PCB board fixing structure according to claim 1 or 2, characterized in that, The upper end of the rib (6) is obliquely cut downward to form an oblique guide surface (610) facing the PCB board (3).

4. The shell and PCB board fixing structure according to claim 1, characterized in that, Each side of the PCB board (3) along its length is provided with a rib (6) at its tail end between the PCB board (3) and the cavity wall of the lower shell (1) to allow the PCB board (3) and the lower shell (1) to form a transition fit.

5. The shell and PCB board fixing structure according to claim 4, characterized in that, The ribs (6) between the side of the PCB board (3) and the inner wall of the lower shell (1) are fixed to the inner wall of the lower shell (1).

6. The shell and PCB board fixing structure according to claim 1, characterized in that, The positioning post (180) is provided with a rib (6) between the side of the gold finger of the PCB board (3) and the groove wall of the positioning groove (310) on the PCB board (3) and between the side of the positioning post (180) away from the gold finger of the PCB board (3) and the groove wall of the positioning groove (310) on the PCB board (3) to make the PCB board (3) and the positioning post (180) form a transition fit.

7. The shell and PCB board fixing structure according to claim 6, characterized in that, The ribs (6) between the side of the positioning post (180) near the gold finger of the PCB board (3) and the groove wall of the positioning groove (310) on the PCB board (3), and between the side of the positioning post (180) away from the gold finger of the PCB board (3) and the groove wall of the positioning groove (310) on the PCB board (3), are respectively fixed to the side of the positioning post (180).

8. The shell and PCB board fixing structure according to claim 1, characterized in that, The side of the positioning post (180) adjacent to the PCB board (3) is an arc-shaped surface, and the side of the positioning groove (310) opposite to the arc-shaped surface on the positioning post (180) is an arc-shaped surface.

9. The shell and PCB board fixing structure according to claim 1, characterized in that, An upper shell (2) is assembled on the lower shell (1). A threaded hole (181) is opened downward on the upper surface of the positioning post (180). The lower shell (1) and the upper shell (2) are fastened together by screws (7). The screws (7) are threadedly connected to the threaded hole (181) on the positioning post (180).

10. An 800G OSFP optical module, characterized in that, Includes the housing and PCB board fixing structure as described in any one of claims 1 to 9.

Images