Optical module with function of eliminating dimensional tolerance of PCB (Printed Circuit Board)

Abstract

The utility model relates to an optical module with a function of eliminating dimensional tolerance of a PCB (Printed Circuit Board), a PCB is arranged in an inner cavity formed between a lower structural member and an upper structural member, two side edges above the PCB are respectively provided with at least one opening type polygonal elastic ring, the upper ends of the opening type polygonal elastic rings abut against the top wall of the upper structural member, and the lower ends of the opening type polygonal elastic rings abut against the top wall of the lower structural member. The lower end of the open type polygonal elastic ring abuts against the upper surface of the PCB so that the PCB can be tightly attached to the lower structural part, the distance between the lower surface of the PCB and the lower surface of the golden finger end of the lower structural part is 2.25 + / -0.03 mm, and the distance between the lower surface of the PCB and the upper surface of the golden finger end of the upper structural part is 6.25 + / -0.03 mm. The beneficial effects are that the total height size is (2.25 + / -0.03 mm) + (6.25 + / -0.03 mm) = 8.5 + / -0.06 mm, so that 8.5 + / -0.1 mm required by the protocol size is completely satisfied, the out-of-tolerance risk is reduced, and the structure height size requirement is better ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of optical modules, and particularly relates to an optical module with a function of eliminating the dimensional tolerance of a PCB board. Background Art

[0002] The optical module in the prior art includes a lower structural member and an upper structural member covering the lower structural member. A PCB board is arranged in the inner cavity formed between the lower structural member and the upper structural member. The lower structural member and the upper structural member are fixed by multiple screws, and the PCB board is pressed by the cooperation of the lower structural member and the upper structural member. Due to the production precision of the product, the height from the lower surface of the gold finger end of the lower structural member to the lower surface of the PCB board is 2.25±0.03 mm, the height of the PCB board is 1.0±0.1 mm, and the height from the upper surface of the PCB board to the upper surface of the gold finger end of the upper structural member (2) is 5.25±0.03 mm. The final total height dimension is: (2.25±0.03 mm)+(1.0±0.1 mm)+(5.25±0.03 mm)=8.5±0.16 mm, as Figure 1 shown, while the protocol dimension is: 8.5±0.1 mm, so there is a serious risk of out-of-tolerance. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an optical module with a function of eliminating the dimensional tolerance of a PCB board to overcome the above deficiencies in the prior art.

[0004] The technical solution for the utility model to solve the above technical problem is as follows: An optical module with a function of eliminating the dimensional tolerance of a PCB board includes a lower structural member and an upper structural member fixedly covering the lower structural member. A PCB board is arranged in the inner cavity formed between the lower structural member and the upper structural member. At least one open multi-sided elastic ring is arranged at each of the two side edges in the length direction above the PCB board. The upper end of the open multi-sided elastic ring abuts against the top wall of the upper structural member, and the lower end of the open multi-sided elastic ring abuts against the upper surface of the PCB board to make it closely adhere to the lower structural member. The distance from the lower surface of the PCB board to the lower surface of the gold finger end of the lower structural member is 2.25±0.03 mm, and the distance from the lower surface of the PCB board to the upper surface of the gold finger end of the upper structural member is 6.25±0.03 mm.

[0005] The beneficial effects of the present utility model are as follows: Since a plurality of open - ended multi - sided elastic rings are installed between the upper structural member and the PCB board, and the open - ended multi - sided elastic rings can eliminate (absorb) the dimensional tolerance of the PCB board, it can ensure that the distance between the lower surface of the PCB board and the lower surface of the gold finger end of the lower structural member is 2.25 ± 0.03 mm, and ensure that the distance between the lower surface of the PCB board and the upper surface of the gold finger end of the upper structural member is 6.25 ± 0.03 mm. Thus, the total height dimension is: (2.25 ± 0.03 mm)+(6.25 ± 0.03 mm)=8.5 ± 0.06 mm, so it fully meets the requirement of 8.5 ± 0.1 mm of the protocol dimension, reducing the risk of out - of - tolerance, and thus can better ensure the requirement of the structural height dimension. In addition, compared with the soft rubber pad, the open - ended multi - sided elastic ring of this structure has no defect of exceeding the service life and will not affect its supporting force due to the change of time.

[0006] On the basis of the above - mentioned technical solution, the present utility model can be further improved as follows.

[0007] Further, the open - ended multi - sided elastic ring includes: a first horizontal section, with an outward - inclined section provided above each of the two end parts of the first horizontal section, a vertical section provided at the upper end of each of the two inclined sections, a second horizontal section provided inside the upper end of each vertical section, and a gap between the two second horizontal sections; the first horizontal section is attached to the upper surface of the PCB board, and the second horizontal section is attached to the top wall of the upper structural member.

[0008] The beneficial effect of adopting the above is that the open - ended multi - sided elastic ring of this structure has sufficient supporting force.

[0009] Further, the open - ended multi - sided elastic ring is made by an integral molding process.

[0010] Further, on each of the two side walls of the upper structural member, a positioning groove is opened at each position where the open - ended multi - sided elastic ring is located. The open - ended multi - sided elastic ring is arranged in the positioning groove of the upper structural member, and the lower end of the open - ended multi - sided elastic ring extends outside the positioning groove.

[0011] The beneficial effect of adopting the above is that it can ensure the accuracy of the position of the open - ended multi - sided elastic ring.

[0012] Further, at least one baffle for preventing the open - ended multi - sided elastic ring inside from tipping over is arranged outside each positioning groove, and the baffle is fixed to the upper structural member.

[0013] The beneficial effect of adopting the above is that by preventing the open - ended multi - sided elastic ring from tipping over, it can always press the PCB board as expected.

[0014] Furthermore, the baffle is integrally formed with the upper structural member.

[0015] Further, two baffles are arranged outside each positioning groove, and each baffle blocks two vertical segments of the open multi-sided elastic ring respectively.

[0016] Further, two open multi-sided elastic rings are arranged at two side edges in the length direction above the PCB board, and the two open multi-sided elastic rings on each side above the PCB board are respectively located in the middle area of the PCB board.

[0017] The beneficial effect of the above further improvement is: multi-point pressing, better accuracy.

[0018] Further, the lower structural member and the upper structural member are fixedly connected by screws. Insertion parts are provided at the gold finger ends on two side walls of the lower structural member, and extension parts extending downward are provided at the gold finger ends on two side walls of the upper structural member. A concave groove is provided on one side of the extension part close to the insertion part. When the upper structural member covers the lower structural member, the insertion part is inserted into the concave groove of the extension part.

[0019] The beneficial effect of the above further improvement is: after the upper structural member and the lower structural member are assembled, by inserting the insertion part into the concave groove of the extension part, it can prevent the gold finger end of the upper structural member from warping outwards and avoid the gold finger end of the lower structural member from warping outwards, thereby avoiding the loosening of the PCB board. Description of the Drawings

[0020] Figure 1 It is a dimension diagram of each part of the optical module in the prior art;

[0021] Figure 2 It is a structural diagram of the optical module with the function of eliminating the dimensional tolerance of the PCB board in the present invention;

[0022] Figure 3 It is Figure 2 The structural diagram left after removing the upper structural member;

[0023] Figure 4 It is a structural diagram of the lower structural member;

[0024] Figure 5 It is Figure 2 The structural diagram left after removing the lower structural member;

[0025] Figure 6 It is Figure 5 The structural diagram left after removing the PCB board;

[0026] Figure 7 It is a sectional view of the optical module with the function of eliminating the dimensional tolerance of the PCB board in the present invention;

[0027] Figure 8 It is a structural diagram of the open multi-sided elastic ring.

[0028] In the drawings, the list of components represented by each reference numeral is as follows:

[0029] 1. Lower structural member, 110. Insertion part, 2. Upper structural member, 210. Positioning groove, 220. Extension part, 221. Concave groove, 3. PCB board, 4. Open - type multi - sided elastic ring, 410. First horizontal section, 420. Inclined section, 430. Vertical section, 440. Second horizontal section, 5. Baffle, 6. Screw. Detailed implementation mode

[0030] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0031] Embodiment 1

[0032] As Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 shown, an optical module with the function of eliminating the dimensional tolerance of the PCB board includes: a lower structural member 1 and an upper structural member 2. Among them, the upper structural member 2 is fixedly covered on the lower structural member 1, and an inner cavity will be formed between the lower structural member 1 and the upper structural member 2. The PCB board 3 is arranged in the inner cavity formed between the lower structural member 1 and the upper structural member 2; at least one open - type multi - sided elastic ring 4 is arranged on each of the two side edges in the length direction above the PCB board 3. The upper end of the open - type multi - sided elastic ring 4 abuts against the top wall of the upper structural member 2, and the lower end of the open - type multi - sided elastic ring 4 abuts against the upper surface of the PCB board 3 to make it (the PCB board) closely adhere to the lower structural member 1. Since a plurality of open - type multi - sided elastic rings 4 are installed between the upper structural member 2 and the PCB board 3, and the dimensional tolerance of the PCB board 3 can be eliminated (absorbed) through the open - type multi - sided elastic rings 4, it can be ensured that the distance between the lower surface of the PCB board 3 and the lower surface of the gold finger end of the lower structural member 1 is 2.25 ± 0.03 mm, and the distance between the lower surface of the PCB board 3 and the upper surface of the gold finger end of the upper structural member 2 is 6.25 ± 0.03 mm. In this way, the total height dimension is: (2.25 ± 0.03 mm)+(6.25 ± 0.03 mm)=8.5 ± 0.06 mm. Therefore, it fully meets the requirement of 8.5 ± 0.1 mm of the protocol dimension, reduces the risk of out - of - tolerance, and can better ensure the requirement of the structural height dimension. In addition, compared with the soft rubber pad, the open - type multi - sided elastic ring 4 of this structure has no defect of exceeding the service life and will not affect its supporting force due to the change of time.

[0033] Embodiment 2

[0034] As Figure 3 , Figure 8 shown, this embodiment is a further improvement on Embodiment 1, specifically as follows:

[0035] The open - type multi - sided elastic ring 4 includes: a first horizontal section 410. Above each of the two ends of the first horizontal section 410, there is an outward - inclined section 420. That is, the two inclined sections 420 are distributed in a V - shape, and the mouth - binding end is connected to the first horizontal section 410. At the upper ends of the two inclined sections 420, there is a vertical section 430 each. And inside the upper - end of each vertical section 430, there is a second horizontal section 440. There is a gap between the two second horizontal sections 440. Only with this gap can this structure have the expected elasticity. At this time, this structure forms an open - type multi - sided elastic ring 4. When the open - type multi - sided elastic ring 4 is installed between the upper structural member 2 and the PCB board 3, the first horizontal section 410 is attached to the upper surface of the PCB board 3, and the second horizontal section 440 is attached to the top wall of the upper structural member 2.

[0036] The open - type multi - sided elastic ring 4 can be made of a metal material or a non - metal material. The non - metal material can be, for example, plastic.

[0037] In addition, as a further preferred solution, the open - type multi - sided elastic ring 4 is manufactured by an integral - molding process.

[0038] Embodiment 3

[0039] As Figure 6 、 Figure 7 shown, this embodiment is a further improvement based on Embodiment 1 or 2, specifically as follows:

[0040] On each of the two side walls of the upper structural member 2, at the position where each open - type multi - sided elastic ring 4 is located, a positioning groove 210 is opened. And the open - type multi - sided elastic ring 4 is arranged in the positioning groove 210 of the upper structural member 2. The lower end of the open - type multi - sided elastic ring 4 extends out of the positioning groove 210, which can ensure the accuracy of the position of the open - type multi - sided elastic ring 4.

[0041] Furthermore: At least one baffle 5 for preventing the open - type multi - sided elastic ring 4 inside it from tipping over is arranged outside each positioning groove 210. By preventing the open - type multi - sided elastic ring 4 from tipping over, it can always press the PCB board 3 as expected. In this embodiment, the baffle 5 and the upper structural member 2 are preferably integrally formed.

[0042] Two baffles 5 are arranged outside each positioning groove 210, and each baffle 5 blocks the two vertical sections 430 of the open - type multi - sided elastic ring 4 respectively.

[0043] Embodiment 4

[0044] As Figure 3 shown, this embodiment is a further improvement based on Embodiment 3, specifically as follows:

[0045] Above the PCB board 3, two open - type multi - sided elastic rings 4 are arranged at each of the two side edges in its (PCB board) length direction. The two open - type multi - sided elastic rings 4 on each side above the PCB board 3 are respectively located in the middle area of the PCB board 3. With multi - point pressing, the accuracy is better.

[0046] Embodiment 5

[0047] As Figure 2 、 Figure 4 、 Figure 5 shown, this embodiment is a further improvement based on any one of Embodiments 1 - 4, and is specifically as follows:

[0048] Insertion parts 110 are provided at the gold - finger ends of the two side walls of the lower structural member 1. Extension parts 220 extending downward are provided at the gold - finger ends of the two side walls of the upper structural member 2. A concave groove 221 is provided on the side of the extension part 220 close to the insertion part 110. When the upper structural member 2 covers the lower structural member 1, the insertion part 110 is inserted into the concave groove 221 of the extension part 220. After the upper structural member 2 and the lower structural member 1 are assembled, by inserting the insertion part 110 into the concave groove 221 of the extension part 220, it can prevent the gold - finger end of the upper structural member 2 from warping outwards and avoid the gold - finger end of the lower structural member from warping outwards, thereby avoiding the loosening of the PCB board 3.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above - mentioned embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above - mentioned embodiments within the scope of the present invention.

Claims

1. An optical module capable of eliminating PCB board size tolerance, comprising: A lower structural member (1) and an upper structural member (2) fixedly covering the lower structural member (1), wherein a PCB board (3) is arranged in an inner cavity formed between the lower structural member (1) and the upper structural member (2), characterized in that at least one open-type polygonal elastic ring (4) is arranged above the PCB board (3) at each of two side edges in the length direction thereof, the upper end of the open-type polygonal elastic ring (4) abuts against the top wall of the upper structural member (2), and the lower end of the open-type polygonal elastic ring (4) abuts against the upper surface of the PCB board (3) so that it is closely attached to the lower structural member (1), the distance between the lower surface of the PCB board (3) and the lower surface of the gold finger end of the lower structural member (1) is 2.25±0.03mm, and the distance between the lower surface of the PCB board (3) and the upper surface of the gold finger end of the upper structural member (2) is 6.25±0.03mm.

2. The optical module having the function of eliminating PCB board size tolerance according to claim 1, characterized in that: The open-type multilateral elastic ring (4) comprises: a first horizontal section (410); an outwardly inclined inclined section (420) is respectively provided above the two ends of the first horizontal section (410); a vertical section (430) is respectively provided at the upper end of the two inclined sections (420); a second horizontal section (440) is respectively provided on the inner side of the upper end of each vertical section (430); and a gap is provided between the two second horizontal sections (440); the first horizontal section (410) is attached to the upper surface of the PCB board (3), and the second horizontal section (440) is attached to the top wall of the upper structural member (2).

3. The optical module having the function of eliminating PCB board size tolerance according to claim 2, characterized in that: The open-type multilateral elastic ring (4) is manufactured using an integrated molding process.

4. The optical module having the function of eliminating PCB board size tolerance according to claim 1, characterized in that: A positioning groove (210) is respectively provided on the two side walls of the upper structure (2) at the position where each open-type polygonal elastic ring (4) is located; the open-type polygonal elastic ring (4) is arranged in the positioning groove (210) of the upper structure (2); and the lower end of the open-type polygonal elastic ring (4) extends out of the positioning groove (210).

5. The optical module with the function of eliminating PCB board size tolerance according to claim 4, characterized in that: At least one baffle plate (5) is arranged outside each positioning groove (210) to prevent the open-type multilateral elastic ring (4) therein from tipping over, and the baffle plate (5) is fixed to the upper structure (2).

6. The optical module capable of eliminating PCB board size tolerance according to claim 5, characterized in that: The baffle (5) and the upper structure (2) are formed integrally.

7. The optical module capable of eliminating PCB board size tolerance according to claim 5, characterized in that: Two baffles (5) are arranged outside each positioning groove (210), and each baffle (5) blocks two vertical sections (430) of the open-type multilateral elastic ring (4).

8. The optical module capable of eliminating PCB board size tolerance according to claim 4, 5, 6 or 7, characterized in that: Two open-type polygonal elastic rings (4) are arranged above the PCB board (3) at two side edges in the length direction thereof, and the two open-type polygonal elastic rings (4) on each side above the PCB board (3) are respectively located in the middle area of ​​the PCB board (3).

9. The optical module capable of eliminating PCB board size tolerance according to claim 1, characterized in that: The lower structure (1) and the upper structure (2) are fixedly connected by screws (6); the two side walls of the lower structure (1) are provided with insertion parts (110) at the gold finger ends; the two side walls of the upper structure (2) are provided with extension parts (220) extending downward at the gold finger ends; the extension part (220) is provided with a recessed groove (221) on one side close to the insertion part (110); when the upper structure (2) is covered on the lower structure (1), the insertion part (110) is inserted into the recessed groove (221) of the extension part (220).

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