Optical module

Abstract

The utility model relates to an optical module, which is characterized in that a PCB (Printed Circuit Board) and two oppositely distributed fixing blocks are arranged in an inner cavity formed between a lower structural member and an upper structural member, the lower structural member and the upper structural member are fixed by a plurality of screws, and the two fixing blocks are pressed tightly through the matching of the lower structural member and the upper structural member; the two side edges of the PCB in the length direction of the PCB are clamped into the clamping grooves in the two fixing blocks respectively, the distance between the upper surfaces of the fixing blocks and the upper surface of the golden finger end of the upper structural part is 2.2 + / -0.03 mm, the distance between the bottom walls of the clamping grooves and the upper surfaces of the fixing blocks is 4.05 + / -0.03 mm, and the distance between the bottom walls of the clamping grooves and the lower surface of the golden finger end of the lower structural part is 2.25 + / -0.03 mm. The beneficial effects are that the two sides of the PCB are respectively provided with a fixing block for limiting the PCB, thereby enabling the total height dimension to completely meet the protocol dimension requirement, reducing the out-of-tolerance risk, and better guaranteeing the structure height dimension requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of optical modules, and particularly relates to an optical module. 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 a plurality of screws, and the PCB board is pressed tightly through 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 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 over-tolerance. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an optical module to overcome the above deficiencies in the prior art.

[0004] The technical solution of the utility model to solve the above technical problem is as follows: an optical module includes a lower structural member and an upper structural member covering the lower structural member. A PCB board and two relatively distributed fixing blocks are 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 a plurality of screws, and the two fixing blocks are pressed tightly through the cooperation of the lower structural member and the upper structural member. The two fixing blocks are distributed along the length direction of the lower structural member or the upper structural member; a card slot is opened along the length direction at a corresponding height on the inner side surface of each fixing block, and two side edges along the length direction of the PCB board are respectively clamped into the card slots on the two fixing blocks. The distance from the upper surface of the fixing block to the upper surface of the gold finger end of the upper structural member is 2.2±0.03 mm, the distance from the bottom wall of the card slot to the upper surface of the fixing block is 4.05±0.03 mm, and the distance from the bottom wall of the card slot to the lower surface of the gold finger end of the lower structural member is 2.25±0.03 mm.

[0005] The beneficial effects of the present utility model are as follows: By adding a fixing block for defining the PCB board on each side of the PCB board, since the dimensional tolerance of the fixing block can be controlled within ±0.03 mm according to the existing processing technology, even if the size of the PCB board is 1.0 ± 0.1 mm, after the PCB board is installed between the two fixing blocks, the tolerance band can be changed from ±0.1 mm to ±0.03 mm, greatly reducing the tolerance band. In this way, the total height dimension is: (2.2 ± 0.03 mm) + (4.05 ± 0.03 mm) + (2.25 ± 0.03 mm) = 8.5 ± 0.09 mm. Therefore, it fully meets the requirement of 8.5 ± 0.1 mm for the protocol size, reducing the risk of out-of-tolerance and thus better ensuring the requirement for the structural height dimension.

[0006] Based on the above technical solution, the present utility model can be further improved as follows.

[0007] Further, a pressing mechanism is provided on the fixing block for pressing the PCB board so that its lower surface closely adheres to the bottom wall of the card slot.

[0008] The beneficial effect of the above further improvement is: When processing the card slot on the fixing block, with the bottom wall of the card slot as the reference, through the pressing mechanism, it can be ensured that the PCB board always closely adheres to the bottom wall of the card slot, and even when the height of the top wall of the card slot is on the high side during processing, the position of the PCB board can still be ensured to be accurate.

[0009] Further, the pressing mechanism includes: a counterbore opened on the upper surface of the fixing block, a threaded hole communicating with the card slot is opened at the bottom of the counterbore, and a screw for pressing the PCB board so that its lower surface closely adheres to the bottom wall of the card slot is threadedly connected in each threaded hole, and the nut end of the screw is located in the counterbore.

[0010] The beneficial effect of the above further improvement is: Through this structure, the pressing of the PCB board can be effectively realized, and the operation is convenient.

[0011] Further, a guiding column is coaxially provided at the threaded end of the screw, and a guiding hole is opened on the PCB board, and the guiding column is inserted into the guiding hole.

[0012] The beneficial effect of the above further improvement is: When the screw is turned, the guiding column can be inserted into the guiding hole on the PCB board to ensure the accurate position of the PCB board.

[0013] Further, two pressing mechanisms for pressing the PCB board so that its lower surface closely adheres to the bottom wall of the card slot are provided on each fixing block.

[0014] The beneficial effect of the above further improvement is: Multiple-point pressing provides better stability.

[0015] Further, lower positioning grooves for positioning the fixing blocks are formed on both side walls of the lower structural member, and the bottom wall of the lower positioning groove is attached to the lower surface of the fixing block. Upper positioning grooves for positioning the fixing blocks are formed on both side walls of the upper structural member, and the top wall of the upper positioning groove is attached to the upper surface of the fixing block.

[0016] The beneficial effect of the above is that: through the cooperation of the lower positioning groove and the upper positioning groove, the fixing block is positioned in the length direction of the lower structural member or the upper structural member to ensure the accurate position of the fixing block.

[0017] Further, insertion portions are provided at the gold finger ends of both side walls of the lower structural member, and extension portions extending downward are provided at the gold finger ends of both side walls of the upper structural member. A concave groove is provided on one side of the extension portion close to the insertion portion. When the upper structural member covers the lower structural member, the insertion portion is inserted into the concave groove of the extension portion.

[0018] The beneficial effect of the above is that: after the upper structural member and the lower structural member are assembled, by inserting the insertion portion into the concave groove of the extension portion, 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 preventing the fixing block from loosening. Description of the Drawings

[0019] Figure 1 It is a dimension diagram of each part of the optical module in the prior art;

[0020] Figure 2 It is a structural diagram of the optical module in the present invention;

[0021] Figure 3 It is Figure 2 The remaining structural diagram after removing the upper structural member;

[0022] Figure 4 It is Figure 3 The remaining structural diagram after removing the PCB board;

[0023] Figure 5 It is Figure 4 The remaining structural diagram after removing the fixing block;

[0024] Figure 6 It is a structural diagram of the upper structural member;

[0025] Figure 7 It is a cross-sectional view of the optical module in the present invention;

[0026] Figure 8 It is a cooperation diagram of the PCB board, the fixing block and the screw in the present invention;

[0027] Figure 9 It is a cooperation diagram of the fixing block and the screw.

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

[0029] 1. Lower structural member, 110. Lower positioning groove, 120. Insertion portion, 2. Upper structural member, 210. Upper positioning groove, 220. Extension portion, 221. Concave groove, 3. PCB board, 310. Guide hole, 4. Fixed block, 410. Card slot, 420. Counterbore, 430. Threaded hole, 5. Screw, 6. Screw, 610. Guide post. Specific embodiments

[0030] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] Embodiment 1

[0032] As Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 9As shown in the figure, an optical module includes a lower structural member 1 and an upper structural member 2. The upper structural member 2 covers the lower structural member 1, and an inner cavity is formed between the lower structural member 1 and the upper structural member 2. A PCB board 3 and two relatively distributed fixing blocks 4 are arranged in the inner cavity formed between the lower structural member 1 and the upper structural member 2. The lower structural member 1 and the upper structural member 2 are fixed by multiple screws 5, and the two fixing blocks 4 are pressed tightly through the cooperation of the lower structural member 1 and the upper structural member 2. The two fixing blocks 4 are distributed along the length direction of the lower structural member 1 or the upper structural member 2. The fixing blocks 4 can be made of metal or plastic, as long as they can meet the requirement of no deformation under extrusion. The two fixing blocks 4 are respectively located on both sides of the PCB board 3 along its length direction. On the inner side surface of each fixing block 4, a card slot 410 is opened along its length direction at a corresponding height. The two side edges of the PCB board 3 along its length direction are respectively clamped into the card slots 410 on the two fixing blocks 4 and are attached to the bottom wall of the card slot 410. The fixing blocks 4 are separate parts, and their sizes are easy to control. According to the existing processing technology, the dimensional tolerance of the fixing blocks can be controlled within ±0.03 mm. Therefore, even if the size of the PCB board 3 is 1.0 ± 0.1 mm, after the PCB board 3 is installed between the two fixing blocks 4, the tolerance band can be changed from ±0.1 mm to ±0.03 mm, greatly reducing the tolerance band. When the optical module is assembled, the distance between the upper surface of the fixing block 4 and the upper surface of the gold finger end of the upper structural member 2 is 2.2 ± 0.03 mm, the distance between the bottom wall of the card slot 410 and the upper surface of the fixing block 4 is 4.05 ± 0.03 mm, and the distance between the bottom wall of the card slot 410 and the lower surface of the gold finger end of the lower structural member 1 is 2.25 ± 0.03 mm. Thus, the total height dimension is: (2.2 ± 0.03 mm) + (4.05 ± 0.03 mm) + (2.25 ± 0.03 mm) = 8.5 ± 0.09 mm, so it fully meets the requirement of 8.5 ± 0.1 mm for the protocol size, reducing the risk of out-of-tolerance and thus better ensuring the requirement for the structural height dimension.

[0033] Embodiment 2

[0034] As Figure 7 shown in the figure, this embodiment is a further improvement on Embodiment 1, specifically as follows:

[0035] The fixing block 4 is provided with a pressing mechanism for pressing the PCB board 3 so that its lower surface is closely attached to the bottom wall of the card slot 410. When processing the card slot 410 on the fixing block 4, with the bottom wall of the card slot 410 as the reference, through the pressing mechanism, it can be ensured that the PCB board 3 is always closely attached to the bottom wall of the card slot 410, and even when the height of the top wall of the card slot 410 is on the high side during processing, the position of the PCB board 3 can still be ensured to be accurate.

[0036] Embodiment 3

[0037] As Figure 7 、 Figure 8 、 Figure 9As shown, this embodiment is a further improvement based on Embodiment 2, specifically as follows:

[0038] The pressing mechanism includes: a counterbore 420 opened on the upper surface of the fixed block 4, a threaded hole 430 communicated with the card slot 410 is opened at the bottom of the counterbore 420, and a screw 6 for pressing the PCB board 3 so that its lower surface closely adheres to the bottom wall of the card slot 410 is threadedly connected in each threaded hole 430. The nut end of the screw 6 is located in the counterbore 420. Through this structure, the PCB board 3 can be effectively pressed. The screw is not limited to an internal spring screw head. Of course, in the actual design process, other structures of the pressing mechanism are not excluded, such as setting elastic pieces on the top wall of the card slot 410 and realizing the pressing of the PCB board 3 by means of the elastic force of the elastic pieces.

[0039] Embodiment 4

[0040] As Figure 7 、 Figure 8 、 Figure 9 As shown, this embodiment is a further improvement based on Embodiment 3, specifically as follows:

[0041] The threaded end of the screw 6 is coaxially provided with a guiding column 610, and a guiding hole 310 is opened on the PCB board 3. The guiding column 610 is inserted into the guiding hole 310. When the screw 6 is turned, the guiding column 610 can be inserted into the guiding hole 310 on the PCB board 3 to ensure the accurate position of the PCB board 3.

[0042] Furthermore: Each fixed block 4 is provided with two pressing mechanisms for pressing the PCB board 3 so that its lower surface closely adheres to the bottom wall of the card slot 410. Multiple-point pressing provides better stability.

[0043] Embodiment 5

[0044] As Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 As shown, this embodiment is a further improvement based on any one of Embodiments 1 to 4, specifically as follows:

[0045] Lower positioning grooves 110 for positioning the fixed block 4 are opened on both side walls of the lower structural member 1. The bottom walls of the lower positioning grooves 110 on each side wall of the lower structural member 1 are attached to the lower surfaces of the fixed blocks 4 on the same side. Upper positioning grooves 210 for positioning the fixed blocks 4 on the same side are opened on both side walls of the upper structural member 2. The top walls of the upper positioning grooves 210 on each side wall of the upper structural member 2 are attached to the upper surfaces of the fixed blocks 4 on the same side. Through the cooperation of the lower positioning grooves 110 and the upper positioning grooves 210, the fixed block 4 is positioned and restricted in the length direction of the lower structural member 1 or the upper structural member 2 to ensure the accurate position of the fixed block 4.

[0046] Example 6

[0047] like Figure 5 , Figure 6 As shown, this embodiment is a further improvement on any one of Embodiments 1 to 5, and the details are as follows:

[0048] The two side walls of the lower structural member 1 are provided with an insertion portion 120 at the gold finger end, and the two side walls of the upper structural member 2 are provided with an extension portion 220 extending downward at the gold finger end. The extension portion 220 is provided with a recessed groove 221 on the side close to the insertion portion 120. When the upper structural member 2 is covered on the lower structural member 1, the insertion portion 120 is inserted into the recessed groove 221 of the extension portion 220. After the upper structural member 2 and the lower structural member 1 are assembled, the insertion portion 120 is inserted into the recessed groove 221 of the extension portion 20, which can prevent the gold finger end of the upper structural member 2 from warping outward and the gold finger end of the lower structural member 1 from warping outward, thereby preventing the fixing block 4 from loosening.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An optical module, comprising: A lower structural member (1) and an upper structural member (2) covering the lower structural member (1), characterized in that a PCB board (3) and two relatively distributed fixing blocks (4) are arranged in an inner cavity formed between the lower structural member (1) and the upper structural member (2), the lower structural member (1) and the upper structural member (2) are fixed by a plurality of screws (5), and the two fixing blocks (4) are pressed tightly by the cooperation between the lower structural member (1) and the upper structural member (2), and the two fixing blocks (4) are distributed along the length direction of the lower structural member (1) or the upper structural member (2); the inner cavity of each fixing block (4) is A card slot (410) is provided on the side surface at a corresponding height along its length direction, and the two side edges of the PCB board (3) along its length direction are respectively inserted into the card slots (410) on the two fixing blocks (4), the distance between the upper surface of the fixing block (4) and the upper surface of the gold finger end of the upper structural component (2) is 2.2±0.03 mm, the distance between the bottom wall of the card slot (410) and the upper surface of the fixing block (4) is 4.05±0.03 mm, and the distance between the bottom wall of the card slot (410) and the lower surface of the gold finger end of the lower structural component (1) is 2.25±0.03 mm.

2. An optical module according to claim 1, characterized in that: The fixing block (4) is provided with a pressing mechanism for pressing the PCB board (3) so that its lower surface is closely attached to the bottom wall of the card slot (410).

3. An optical module according to claim 2, characterized in that: The pressing mechanism comprises: a countersunk hole (420) formed on the upper surface of the fixing block (4); a threaded hole (430) connected to the card slot (410) is formed at the bottom of the countersunk hole (420); a screw (6) is connected to the inner thread of each threaded hole (430) for pressing the PCB board (3) so that its lower surface is closely attached to the bottom wall of the card slot (410); and the nut end of the screw (6) is located in the countersunk hole (420).

4. An optical module according to claim 3, characterized in that: A guide column (610) is coaxially arranged at the thread head end of the screw (6), a guide hole (310) is provided on the PCB board (3), and the guide column (610) is inserted into the guide hole (310).

5. An optical module according to any one of claims 2 to 4, characterized in that: Each fixing block (4) is provided with two pressing mechanisms for pressing the PCB board (3) so that its lower surface is closely attached to the bottom wall of the card slot (410).

6. The optical module according to claim 1, characterized in that: The two side walls of the lower structural component (1) are provided with lower positioning grooves (110) for positioning the fixed block (4), and the bottom wall of the lower positioning groove (110) is in contact with the lower surface of the fixed block (4). The two side walls of the upper structural component (2) are provided with upper positioning grooves (210) for positioning the fixed block (4), and the top wall of the upper positioning groove (210) is in contact with the upper surface of the fixed block (4).

7. The optical module according to claim 1, characterized in that: The two side walls of the lower structure (1) are provided with an insertion portion (120) at the gold finger end, the two side walls of the upper structure (2) are provided with an extension portion (220) extending downward at the gold finger end, the extension portion (220) is provided with a recessed groove (221) on one side close to the insertion portion (120), and when the upper structure (2) is covered on the lower structure (1), the insertion portion (120) is inserted into the recessed groove (221) of the extension portion (220).

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