Adjustable filter EMI spring for pluggable optical module

Abstract

The application discloses an adjustable filter EMI spring plate of a plug-in optical module, which comprises an optical module and an EMI spring plate assembly; the EMI spring plate assembly comprises a spring plate and a conformal coil; the spring plate is provided with a first bending part at each end; a pin is fixed on the first bending part; the conformal coil is provided with a second bending part at each end; the conformal coil is embeddedly installed on the inner wall surface of the spring plate; and the pin is inserted into the end of the second bending part. In the application, the current of the conformal coil is changed, and then the stretching and contraction deformation degree of the conformal coil under the action of the current magnetic field is changed, so that the spring plate is driven to stretch and expand or contract and fold, the grid gap or the wrinkle gap of the EMI spring plate assembly can be flexibly adjusted, and the filtering and shielding of electromagnetic waves in a specified wavelength range can be easily realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of EMI spring of optical module, in particular to an adjustable filter EMI spring of plug-in optical module. BACKGROUND

[0002] With the increasing transmission rate of metal packaging optical transceiver module, the optical transceiver module with high transmission rate is prone to produce excessive EMI (electromagnetic interference) phenomenon, especially the plug-in optical module with high speed, small size and high density. Due to the production and assembly structure of the optical module, there are inevitably gaps between the housings of adjacent assembly structures, but even a slight structural gap can easily cause EMI problems due to electromagnetic wave leakage.

[0003] One of the most effective methods to solve EMI is electromagnetic shielding. Electromagnetic shielding is to use shielding body to attenuate electromagnetic wave, so as to reduce the interference or damage caused by electromagnetic wave. In the prior art, EMI spring is generally selected to be installed at the gap position of the housing assembly to shield electromagnetic wave, but the grid gap or wrinkle gap of the EMI spring used in the plug-in optical module is generally not adjustable, so that it is difficult to realize the filtering of electromagnetic wave in the specified wavelength range. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an adjustable filter EMI spring of plug-in optical module which is easy to realize the filtering of electromagnetic wave in the specified wavelength range.

[0005] In order to solve the above technical problem, the present application adopts the following technical scheme: an adjustable filter EMI spring of plug-in optical module, comprising an optical module, further comprising an EMI spring assembly, the EMI spring assembly is installed on the optical module;

[0006] The EMI spring assembly comprises a spring and a contour coil, the spring is in C-shaped structure, two ends of the spring are respectively provided with a first bending part, a pin is fixed on the first bending part, the contour coil is in C-shaped structure, two ends of the contour coil are respectively provided with a second bending part, the contour coil is inlaidly installed on the inner wall surface of the spring, the second bending part is attachedly installed on the inner wall surface of the first bending part, and the pin is inserted into the end part of the second bending part.

[0007] Further, a longitudinal wrinkle part is arranged on the spring in the length direction and in the middle, the longitudinal wrinkle part extends to the first bending part, and the longitudinal wrinkle part is in outward arching structure.

[0008] Further, the elastic sheet is provided with a plurality of transverse fold parts uniformly distributed along the width direction, the transverse fold parts extend to the longitudinal fold parts and intersect with the longitudinal fold parts, and a strip-shaped hole is formed at the intersection position, and the transverse fold part is in an outward arching structure.

[0009] Further, the strip-shaped hole at each bending position of the longitudinal fold part is deformed into a notch.

[0010] Further, the end of the first bending part is provided with the notch, and the two spaced apart pins are fixed in the notch.

[0011] Further, the conformal coil has a peripheral size matched with the inner size of the elastic sheet, the conformal coil comprises a plurality of U-shaped coil sections connected in series, and the U-shaped coil sections are embedded in the inside of the longitudinal fold part.

[0012] Further, the conformal coil further comprises a connecting coil section arranged on the second bending part, the connecting coil section has two, respectively arranged at the two ends of the conformal coil, and respectively fixedly connected to the U-shaped coil sections.

[0013] Further, the connecting coil section is arranged in the notch at the end of the first bending part, and the two ends of the connecting coil section are respectively provided with a plug-in interface, and the pins are matched and plugged into the plug-in interface.

[0014] Further, the EMI elastic sheet assembly further comprises a PCB and a circuit soft belt, the PCB has two, respectively arranged at the two ends of the elastic sheet, and respectively connected to the connecting coil section through the circuit soft belt, and any one of the PCBs is respectively connected with at least two circuit soft belts.

[0015] Further, the optical module comprises a base and an upper cover, and the EMI elastic sheet assembly is embedded in the base.

[0016] The beneficial effects of the present application are embodied in:

[0017] In the present application, the EMI elastic sheet assembly is assembled by the elastic sheet and the conformal coil which are in C-shaped structure and embedded in the inside and outside, the EMI elastic sheet assembly in C-shaped structure is embedded around the optical module, by changing the size of the current of the conformal coil, the stretching and contraction degree of the conformal coil under the action of the current magnetic field is changed, so as to drive the elastic sheet to stretch or fold, which can flexibly adjust the grid gap or the fold gap of the EMI elastic sheet assembly, and is easy to realize the filtering and shielding of electromagnetic waves in the specified wavelength range. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1It is the whole structure schematic diagram of the optical module of one embodiment of the present application.

[0019] Figure 2 It is the whole structure schematic diagram of the optical module after removing the upper cover of one embodiment of the present application.

[0020] Figure 3 It is the whole structure schematic diagram of the EMI spring assembly of one embodiment of the present application.

[0021] Figure 4 It is the whole structure schematic diagram of the spring of one embodiment of the present application.

[0022] Figure 5 It is the assembly schematic diagram of the conformal coil circuit of one embodiment of the present application.

[0023] Figure 6 It is the equivalent schematic diagram of the conformal coil circuit of one embodiment of the present application.

[0024] The marks of the components in the drawings are as follows: 1, optical module; 101, base; 102, upper cover; 2, EMI spring assembly; 3, spring; 301, first bending part; 302, pin; 303, longitudinal wrinkle part; 304, notch; 305, transverse wrinkle part; 306, strip hole; 4, conformal coil; 401, second bending part; 402, hairpin coil section; 403, connecting coil section; 404, plug interface; 5, PCB; 6, circuit soft band. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. It should be noted that if the description of “first”, “second” and the like is involved in the embodiments of the present application, the description of “first”, “second” and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with “first”, “second” can explicitly or implicitly include at least one of the features.

[0026] Referring to Figures 1-6 .

[0027] The present application provides an adjustable filter EMI spring of a plug-in optical module, comprising an optical module 1, further comprising an EMI spring assembly 2, the EMI spring assembly 2 is installed on the optical module 1.

[0028] The EMI spring assembly 2 comprises a spring 3 and a conformal coil 4, the spring 3 is in a C-shaped structure, two ends of the spring 3 are respectively provided with a first bending part 301, a pin 302 is fixed on the first bending part 301, the conformal coil 4 is in a C-shaped structure, two ends of the conformal coil 4 are respectively provided with a second bending part 401, the conformal coil 4 is inlaidly installed on the inner wall surface of the spring 3, the second bending part 401 is attached to the inner wall surface of the first bending part 301, and the pin 302 is inserted into the end of the second bending part 401.

[0029] In the present application, the EMI spring assembly is composed of springs and conformal coils which are inlaid and fitted together in a C-shaped structure, the C-shaped EMI spring assembly is inlaid around the optical module, by changing the current of the conformal coil, the stretching and contraction degree of the conformal coil under the action of the current magnetic field is changed, so as to drive the spring to stretch or fold, which can flexibly adjust the grid gap or wrinkle gap of the EMI spring assembly, and easily realize the filtering and shielding of electromagnetic waves in a specified wavelength range.

[0030] In an embodiment, a longitudinal wrinkle part 303 is arranged on the spring 3 in the length direction, the longitudinal wrinkle part 303 extends to the first bending part 301, and the longitudinal wrinkle part 303 is in an outward arching structure. In this way, the first bending part 301 improves the stability of the spring 3 during installation, the spring 3 can fold and press the longitudinal wrinkle part 303 inward along the front and back directions, and the deformation of the spring 3 in the width direction and the compactness of the wrinkle gap are realized.

[0031] In an embodiment, a plurality of transverse wrinkle parts 305 are uniformly and interval arranged on the spring 3 in the width direction, the transverse wrinkle part 305 extends to the longitudinal wrinkle part 303 and intersects with the longitudinal wrinkle part 303, a strip-shaped hole 306 is arranged at the intersection position, and the transverse wrinkle part 305 is in an outward arching structure. In this way, the spring 3 can fold and press the transverse wrinkle part 305 inward along the left and right directions, the deformation of the spring 3 in the length direction and the compactness of the wrinkle gap are realized, and the strip-shaped hole 306 provides plasticity conditions for the deformation of the spring 3.

[0032] In an embodiment, each strip-shaped hole 306 at each bending position of the longitudinal wrinkle part 303 is deformed into a notch 304. In this way, the deformed notch 304 is arranged at each bending corner position of the spring 3, so that the spring 3 can be bent to form a C-shaped structure, and the two ends of the spring 3 can be bent to form the first bending part 301.

[0033] In an embodiment, the end of the first bending part 301 is provided with the notch 304, and two spaced apart pins 302 are fixed in the notch 304. In this way, the pins 302 ensure the fixed connection between the elastic sheet 3 and the conformal coil 4.

[0034] In an embodiment, the conformal coil 4 has a peripheral size matching the inner size of the elastic sheet 3, and the conformal coil 4 includes a plurality of connected loop coil sections 402, which are inlaid in the inside of the longitudinal fold part 303. In this way, the plurality of connected loop coil sections 402 enable the conformal coil 4 to stretch or contract under the action of a current magnetic field, thereby providing plasticity for the deformation of the conformal coil 4.

[0035] In an embodiment, the conformal coil 4 further includes a connecting coil section 403 arranged on the second bending part 401, and the connecting coil section 403 has two ends respectively located at the two ends of the conformal coil 4 and respectively fixedly connected to the loop coil sections 402.

[0036] The connecting coil section 403 is arranged in abutment with the first bending part 301 and is inlaid in the notch 304 at the end of the first bending part 301, and the two ends of the connecting coil section 403 are respectively provided with plug-in interfaces 404, and the pins 302 are plugged into the plug-in interfaces 404. In this way, the inlaid and matched elastic sheet 3 and conformal coil 4 are fixedly assembled through the plug-in matching of the connecting coil section 403 and the pins 302, thereby preventing the structure of the EMI elastic sheet assembly 2 from being loose.

[0037] In an embodiment, the EMI elastic sheet assembly 2 further includes a PCB 5 and a circuit soft band 6, and the PCB 5 has two ends respectively located at the two ends of the elastic sheet 3 and respectively connected to the connecting coil section 403 via the circuit soft band 6, and any one of the PCBs 5 is respectively connected to at least two circuit soft bands 6. In this way, the conformal coil 4 is connected to the PCB 5 through the circuit soft band 6, and then is connected to the circuit of the optical module 1 through the PCB 5, thereby realizing the normal circulation of the current of the EMI elastic sheet assembly 2.

[0038] In an embodiment, the optical module 1 includes a base 101 and an upper cover 102, and the EMI elastic sheet assembly 2 is inlaid on the base 101. In this way, the EMI elastic sheet assembly 2 is inlaid on the shell splicing gap of the optical module 1, thereby realizing the filtering and shielding of electromagnetic waves in a specified wavelength range.

[0039] It should be understood that the examples and embodiments described herein are merely for the purposes of illustration and are not intended to limit the present application, which is defined by the claims. Various modifications or changes in addition to those discussed above can be resorted to by those skilled in the art without departing from the spirit and principle of the application, and it is intended to fall within the protection of the claims.

Claims

1. An adjustable filter EMI spring for a pluggable optical module, comprising an optical module (1), characterized in that: It also includes an EMI spring assembly (2), which is mounted on the optical module (1); The EMI spring assembly (2) includes a spring (3) and a conformal coil (4). The spring (3) has a C-shaped structure. The two ends of the spring (3) are respectively provided with a first bending part (301), and a pin (302) is fixed on the first bending part (301). The conformal coil (4) has a C-shaped structure, and the two ends of the conformal coil (4) are respectively provided with a second bend (401). The conformal coil (4) is embedded in the inner wall of the spring sheet (3), the second bent portion (401) is fitted to the inner wall of the first bent portion (301), and the pin (302) is inserted into the end of the second bent portion (401). The spring piece (3) has a longitudinal pleated part (303) centered along its length direction. The longitudinal pleated part (303) extends to the first bending part (301) and the longitudinal pleated part (303) has an outward arched structure. The spring piece (3) has a plurality of transverse folds (305) evenly spaced along the width direction. The transverse folds (305) extend to the longitudinal folds (303) and intersect with the longitudinal folds (303). A strip hole (306) is provided at the intersection. The transverse folds (305) have an outward arched structure. The outer dimensions of the conformal coil (4) match the inner dimensions of the spring piece (3). The conformal coil (4) includes multiple loop coil sections (402) connected end to end. The loop coil sections (402) are embedded in the interior of the longitudinal pleated portion (303).

2. The adjustable EMI filter spring of the pluggable optical module as described in claim 1, characterized in that: Each of the strip holes (306) located at each bend position on the longitudinal fold (303) is deformed into a notch (304).

3. The adjustable EMI filter spring of the pluggable optical module as described in claim 2, characterized in that: The end of the first bent portion (301) is provided with the notch (304), and two spaced pins (302) are fixed in the notch (304).

4. The adjustable EMI filter spring of the pluggable optical module as described in claim 2, characterized in that: The conformal coil (4) also includes a connecting coil section (403) disposed on the second bending portion (401). There are two connecting coil sections (403), which are located at both ends of the conformal coil (4) and are fixedly connected to the loop coil section (402).

5. The adjustable EMI filter spring of the pluggable optical module as described in claim 4, characterized in that: The connecting coil section (403) is fitted to the first bent portion (301) and is embedded in the notch (304) located at the end of the first bent portion (301). The two ends of the connecting coil section (403) are respectively provided with plug-in interfaces (404), and the pin (302) is matched and plugged into the plug-in interface (404).

6. The adjustable EMI filter spring of the pluggable optical module as described in claim 4, characterized in that: The EMI spring assembly (2) further includes a PCB (5) and a circuit strip (6). There are two PCBs (5), which are located at both ends of the spring (3) and are connected to the connecting coil section (403) via the circuit strip (6). Each PCB (5) is connected to at least two of the circuit strips (6).

7. The adjustable EMI filter spring of the pluggable optical module as described in claim 1, characterized in that: The optical module (1) includes a base (101) and a top cover (102), and the EMI spring assembly (2) is mounted on the base (101).

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