WO2022165864A1 - 优化emi屏蔽性能的光模块及光模块电磁屏蔽结构 - Google Patents

优化emi屏蔽性能的光模块及光模块电磁屏蔽结构 Download PDF

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Publication number
WO2022165864A1
WO2022165864A1 PCT/CN2021/077165 CN2021077165W WO2022165864A1 WO 2022165864 A1 WO2022165864 A1 WO 2022165864A1 CN 2021077165 W CN2021077165 W CN 2021077165W WO 2022165864 A1 WO2022165864 A1 WO 2022165864A1
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Prior art keywords
unlocking
emi
optical module
base
upper cover
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PCT/CN2021/077165
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English (en)
French (fr)
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舒坤
张勇
许其建
翟羽
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武汉华工正源光子技术有限公司
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Priority to US17/581,994 priority Critical patent/US11927816B2/en
Publication of WO2022165864A1 publication Critical patent/WO2022165864A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4274—Electrical aspects
    • G02B6/4277—Protection against electromagnetic interference [EMI], e.g. shielding means

Definitions

  • the invention belongs to the field of optoelectronic technology, and in particular relates to an optical module and an electromagnetic shielding structure of the optical module with optimized EMI shielding performance.
  • the transmission rate of optical modules is getting higher and higher (the signal frequency is getting higher and higher, the current 400G module base frequency can reach 26.56GHZ), and the power consumption of the module itself is also Higher and higher.
  • the electromagnetic radiation (EMI) of the module will be stronger, and the shielding ability required by the optical module structure also needs to be improved, otherwise it cannot meet the customer's requirements for EMI testing.
  • the main principle of electromagnetic shielding is the Faraday cage principle.
  • a closed “cage” is formed through the conductor, and the source of electromagnetic radiation is closed in this "cage".
  • the cage can be allowed to have holes or gaps, but the maximum length of the gap is directly Affects the shielding effectiveness of this "cage".
  • the shielding effectiveness of this slot is usually determined by the wavelength of the electromagnetic wave. The longer the wavelength, the greater the allowable slot length to achieve the same shielding effectiveness.
  • the wavelength of electromagnetic waves in the air speed ⁇ frequency; the wavelength of electromagnetic waves at 26.5G frequency is 11.32mm.
  • the gap of our structural parts can reach 1/20 of the wavelength, that is, 0.566mm, the shielding efficiency can reach about 20dB. In ordinary applications, we believe that this has reached the limit of structural shielding.
  • the electromagnetic shielding scheme of the optical module generally achieves the shielding effect by inserting the module into a squirrel cage (cage), and then snapping the squirrel cage on the single board.
  • a shielding solution at the optical module level it is first necessary to solve the shielding ability of the optical module structure itself to the radiation of internal components; secondly, it is necessary to solve the shielding effectiveness of the module and the squirrel cage on the single board, that is, to ensure the optical module and the squirrel cage.
  • the shrapnel in all four directions have good contact.
  • the upper and lower sides of the module are required by the MSA protocol to be flat, and the space for optimization is small; for the optical module whose unlocking result is designed on the side, in order to ensure that the inner cavity of the structure has enough space to install the device, the sliding plate of the unlocking structure is generally installed. It is designed on the outermost side of the structure, so that the side structure is not an integral part, but consists of three parts: the base, the upper cover, and the unlocking device. Therefore, improving the shielding effectiveness between the optical module and the squirrel cage can be achieved by optimizing the contact between the side unlocking mechanism area and the squirrel cage.
  • the purpose of the present invention is to overcome the defects of the prior art and provide an optical module and an electromagnetic shielding structure of the optical module with optimized EMI shielding performance.
  • the cage shrapnel matching structure reduces the gap between the mouse cage and the optical module, thereby improving the shielding effectiveness of the optical module and the mouse cage.
  • the present invention discloses an optical module with optimized EMI shielding performance, comprising a base, an upper cover and an unlocking device formed by connecting an unlocking handle and a movable unlocking piece, the base and the upper cover
  • a limit slot for accommodating the unlocking slides on both sides of the movable unlocking piece is formed by the docking and clamping, the unlocking slides are correspondingly slidably fitted in the limit slots, and the upper end of each unlocking slide is provided with a first gap, It is used to make room for the base EMI boss provided on the base.
  • the lower end of the unlocking slide on each side is provided with a second gap to make way for the upper cover EMI boss provided on the upper cover to cooperate with the optical module.
  • the three inner shrapnels on each side of the entrance of the squirrel cage are in contact with the base EMI boss, the unlocking slide, and the upper cover EMI boss in a one-to-one correspondence.
  • the distance between the upper and lower two inner shrapnel of the three inner shrapnels on each side of the entrance of the squirrel cage is d, and the first gap and the second gap of the unlocking slider on each side are arranged symmetrically up and down, so that the first The upper and lower widths d2 of the notch and the unlocking slide at the second notch are less than or equal to d.
  • the effective matching length L of the base EMI boss, unlocking slide, upper cover EMI boss and the three inner shrapnel on the corresponding side of the squirrel cage entrance on each side of the optical module must satisfy the base EMI boss on each side of the optical module,
  • the unlocking sliding piece and the EMI boss of the upper cover are in independent contact with the highest points of the three inner shrapnel on the corresponding side of the entrance of the squirrel cage, respectively.
  • the base is provided with EMI blocking protrusions
  • the unlocking slide is provided with EMI blocking grooves
  • the EMI blocking grooves extend along the sliding direction
  • the EMI blocking protrusions on the base are slidably matched with the EMI blocking grooves of the unlocking slides. in the isolating slot.
  • the EMI blocking protrusion is located between the base EMI boss and the upper cover EMI boss.
  • the end of the unlocking sliding piece on each side is provided with an unlocking elastic piece for realizing the unlocking function.
  • the unlocking slide is provided with an unlocking stroke control groove
  • the base is provided with an unlocking stroke control boss
  • the unlocking stroke control boss on the base is slidably fitted in the unlocking stroke control groove of the unlocking slide
  • the unlocking sliding piece is provided with an upwardly extending upper protrusion and a downwardly extending lower protrusion near the end
  • the base is provided with a limit groove for slidingly matching with the upper protrusion of the unlocking sliding piece
  • the upper cover is provided with a limit groove for sliding cooperation with the lower protrusion of the unlocking slide, the upper protrusion of the unlocking slide extends into the corresponding limit groove of the base, and the lower part of the unlocking slide
  • the protrusion protrudes into the limit groove corresponding to the upper cover to ensure that the unlocking slide will not come out of the limit groove during the movement.
  • the base is provided with a spring installation groove
  • the spring installation groove is provided with a spring
  • the movable unlocking piece is provided with a notch for a reset sliding piece to block the spring installation groove
  • the reset sliding piece of the movable unlocking piece is provided with a notch.
  • the reset sliding piece spans between the two unlocking sliding pieces, and two sides of the reset sliding piece are respectively connected with the unlocking sliding pieces on both sides.
  • the invention also discloses an electromagnetic shielding structure for an optical module, which includes a squirrel cage and the above-mentioned optical module.
  • the optical module is inserted into the squirrel cage, and the three inner shrapnel on the left and right sides of the entrance of the squirrel cage are in a one-to-one correspondence and are independently connected with each other.
  • the base EMI bosses, unlocking slides, and upper cover EMI bosses on the left and right sides of the optical module are in contact.
  • the base EMI bosses, unlocking slides, and upper cover EMI bosses on each side of the optical module are in one-to-one independent contact with the highest points of the three inner shrapnels on the corresponding side of the squirrel cage entrance.
  • the present invention has at least the following beneficial effects: because the upper end of the unlocking slide on each side of the optical module of the present invention is provided with a first notch, which is used to make way for the base EMI boss provided on the base, and the lower end of the unlocking slide on each side is provided with a first notch. There is a second gap, which is used to make room for the upper cover EMI boss provided on the upper cover, so that the three inner shrapnel on each side of the squirrel cage entrance matched with the optical module are in a one-to-one correspondence with the base EMI boss, Unlock the slider and the upper cover EMI boss contacts.
  • the structural solution provided by the present invention can ensure that the three inner shrapnels on each side of the squirrel cage are in contact with the three parts independently, thereby reducing the gap between the squirrel cage and the optical module, and can effectively improve the shielding efficiency of the optical module and the squirrel cage. .
  • the base of the present invention is provided with an EMI isolation point, which can interrupt the matching gap between the unlocking slide (sheet metal) and the base, shorten the gap by half, and improve the shielding efficiency.
  • the EMI blocking groove is to ensure that the unlocking slide will not interfere with the EMI blocking protrusion on the base during the movement of the unlocking ring.
  • FIG. 1 is a schematic structural diagram of an optical module for optimizing EMI shielding performance provided by an embodiment of the present invention
  • Fig. 2 is the enlarged view of P part of Fig. 1;
  • Fig. 3 is the top view of Fig. 1;
  • FIG. 4 is a perspective view of a base and an upper cover of an optical module provided by an embodiment of the present invention after docking and clamping;
  • Fig. 5 is the side view of Fig. 4;
  • Fig. 6 is the top view of Fig. 4;
  • FIG. 7 is a side view of an unlocking device for an optical module provided by an embodiment of the present invention.
  • Fig. 8 is the top view of Fig. 7;
  • Fig. 9 is the structural representation of squirrel cage
  • FIG. 10 is a schematic diagram of the cooperation of three inner elastic pieces on one side of the squirrel cage with the structural components of the optical module according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of the cooperation of three inner elastic pieces on one side of a traditional squirrel cage with a structural member of an optical module;
  • FIG. 12 is a schematic diagram of a contact gap between an unlocking slide and a base of an optical module according to an embodiment of the present invention
  • FIG. 13 is a schematic diagram of a contact gap between an unlocking slide and a base of a conventional optical module.
  • 1 is the base
  • 11 is the base EMI boss
  • 12 is the EMI blocking protrusion
  • 13 is the unlocking stroke control boss
  • 14 is the spring installation groove
  • 2 is the unlocking device
  • 21 is the unlocking handle
  • 22 is the movable unlocking 221 is the unlocking slide
  • 222 is the reset slide
  • 223 is the unlocking spring
  • 224 is the upper protrusion
  • 225 is the lower protrusion
  • 226 is the EMI blocking groove
  • 227 is the unlocking stroke control groove
  • 228 is the spring paddle
  • 3 is the upper cover
  • 31 is the EMI boss of the upper cover
  • 4 is the spring
  • 5 is the squirrel cage
  • 51 is the inner shrapnel
  • 52 is the outer shrapnel.
  • an embodiment of the present invention provides an optical module with optimized EMI shielding performance, including a base 1, an upper cover 3, and an unlocking device 2 formed by connecting an unlocking handle 21 and a movable unlocking member 22, the base 1 is docked with the upper cover 3 to form a limit slot for accommodating the unlocking slides 221 on both sides of the movable unlocking member 22.
  • the upper end of the 221 is provided with a first notch, which is used to make way for the base EMI boss 11 provided on the base 1, and the lower end of the unlocking slide 221 on each side is provided with a second notch, which is used for the upper cover 3.
  • the upper cover EMI boss 31 gives way, so that the three inner elastic pieces 51 on each side of the entrance of the squirrel cage 5 that cooperate with the optical module are in a one-to-one correspondence with the base EMI boss 11, the unlocking slide 221, and the upper cover EMI boss 31 respectively. touch.
  • the purpose of setting the base EMI boss 11 on the base 1 is to increase the contact area between the base 1 and the corresponding shrapnel of the squirrel cage, and the purpose of setting the upper cover EMI boss 31 on the upper cover 3 is to increase the contact area between the upper cover 3 and the shrapnel corresponding to the squirrel cage .
  • the distance between the upper and lower two inner elastic pieces 51 among the three inner elastic pieces 51 on each side of the entrance of the squirrel cage is d, and the first gap and the second gap of the unlocking sliding piece 221 on each side are arranged symmetrically up and down,
  • the upper and lower width d2 of the unlocking sliding piece 221 at this location is made smaller than or equal to d.
  • the first gap and the second gap are isosceles trapezoids.
  • the base EMI boss 11 and the upper cover EMI boss 31 are isosceles trapezoids.
  • the distance between the lower end surface of the same-side base EMI boss 11 and the upper end surface of the upper cover EMI boss 31 is greater than d2.
  • the effective matching length L of the base EMI boss 11 , the unlocking slide 221 , the upper cover EMI boss 31 and the three inner shrapnel 51 on the corresponding side of the entrance of the squirrel cage 5 on each side of the optical module needs to meet the requirements of each side of the optical module.
  • the base EMI boss 11 , the unlocking slide 221 , and the upper cover EMI boss 31 are respectively in one-to-one correspondence with the highest points of the three inner elastic pieces 51 on the corresponding side of the entrance of the squirrel cage 5 .
  • the base 1 is provided with an EMI blocking protrusion 12
  • the unlocking slide 221 is provided with an EMI blocking groove 226, the EMI blocking groove 226 extends along the sliding direction, and the EMI blocking protrusion 12 on the base 1 is provided Sliding fit in the EMI blocking groove 226 of the unlocking slide 221 .
  • the EMI blocking groove 226 ensures that the unlocking sliding piece 221 will not interfere with the EMI blocking protrusion 12 on the base 1 during the movement of the unlocking pull ring.
  • the EMI blocking protrusion 12 is located between the base EMI boss 11 and the upper cover EMI boss 31 .
  • the base 1 is provided with an EMI isolation point (EMI isolation protrusion 12), which can interrupt the matching gap between the unlocking slide 221 (sheet metal) and the base 1, shorten the gap by half, and improve the shielding efficiency.
  • the end of the unlocking slide 221 on each side is provided with an unlocking spring piece 223 for realizing the unlocking function, so that the corresponding squirrel cage spring piece is bounced off the optical module to realize the unlocking function of the optical module and the squirrel cage.
  • the base 1 has an unlocking area mainly for installing the unlocking spring piece 223 .
  • the unlocking slide 221 is provided with an unlocking stroke control groove 227
  • the base 1 is provided with an unlocking stroke control boss 13
  • the unlocking stroke control boss 13 on the base 1 is slidably fitted on the unlocking slide.
  • the unlocking stroke control groove 227 of 221 is used to ensure that the movable unlocking member 22 cooperates with the unlocking stroke control boss 13 on the base 1 during the movement process, so as to realize the stroke control function and limit the movement direction of the movable unlocking member 22 .
  • the unlocking stroke control boss 13 provided on the base 1 is mainly used to ensure that the unlocking device 2 can be assembled with the base 1 after being installed, and will not come out, and at the same time control the movement of the unlocking device 2 and bear the unlocking pulling force.
  • the unlocking sliding piece 221 is provided with an upwardly extending upper protrusion 224 and a downwardly extending lower protrusion 225 near the end, and the base 1 is provided with an upper protrusion 224 for sliding cooperation with the unlocking sliding piece 221
  • the upper cover 3 is provided with a limit groove for sliding cooperation with the lower protrusion 225 of the unlocking slide 221, and the upper protrusion 224 of the unlocking slide 221 extends into the corresponding limit of the base 1.
  • the lower protrusion 225 of the unlocking sliding piece 221 extends into the limiting groove corresponding to the upper cover 3 to ensure that the unlocking sliding piece 221 will not come out of the limiting groove during the movement.
  • the base 1 is provided with a spring installation groove 14, the spring installation groove 14 is provided with a spring 4, and the movable unlocking member 22 is provided with a reset sliding piece 222 for blocking the notch of the spring installation groove 14, and is movable.
  • the reset sliding piece 222 of the unlocking member 22 is provided with a spring paddle 228, and the spring paddle 228 of the movable unlocking member 22 extends into the spring installation groove 14 for compressing the spring, and provides a restoring force to the movable unlocking member 22 through the spring.
  • the unlocking device 2 of this embodiment is composed of two materials.
  • the unlocking handle 21 is a plastic handle for pulling operation;
  • the movable unlocking member 22 is a sheet metal slide, which is mainly used for unlocking function and EMI shielding.
  • the movable unlocking member 22 includes two unlocking slides 221 and a reset slide 222 , the reset slide 222 spans between the two unlock slides 221 , and two sides of the reset slide 222 are respectively connected with the unlock slides 221 on both sides. Both the unlocking slide 221 and the reset slide 222 are sheet metal slides.
  • this embodiment also discloses an electromagnetic shielding structure for an optical module, including a squirrel cage 5 and the optical module as described in the first embodiment, the optical module is inserted into the squirrel cage 5 and the entrance of the squirrel cage 5 is
  • the three inner elastic pieces 51 on the left and right sides are respectively in contact with the base EMI bosses 11 , the unlocking slides 221 , and the upper cover EMI bosses 31 on the left and right sides of the optical module in a one-to-one correspondence.
  • the base EMI bosses 11 , unlocking slides 221 , and upper cover EMI bosses 31 on each side of the optical module are in one-to-one independent contact with the highest points of the three inner elastic pieces 51 on the corresponding side of the entrance of the squirrel cage 5 .
  • the squirrel cage 5 cooperating with the optical module is provided with an outer elastic sheet 52 and an inner elastic sheet 51, and the left and right sides of the squirrel cage cooperating with the optical module are designed with three-section inner elastic sheets 51 of equal width and equal spacing.
  • the improved optical module of the present invention can ensure that the three-segment inner elastic sheet 51 can be in contact with the three-segment structural members (the base EMI boss 11, the unlocking slide 221, the upper cover EMI boss 31) respectively, so as to avoid the same elastic sheet spanning across the same time.
  • the two parts have poor contact due to the fit tolerance, which affects the shielding effectiveness.
  • the distance between the upper end face of the side of the base 1 and the lower end face of the base EMI boss 11 is d1
  • the lower end face of the side of the upper cover 3 and the upper cover EMI boss 31 The distance is d1
  • the distance between the upper end faces of the d3 is d3, the three sections d1, d2, and d3 are in contact with the shrapnel respectively
  • L is the effective length of the three sections to ensure contact with the highest point of the shrapnel.
  • the length L in Figure 2 is to ensure that the structure can ensure contact with the highest point of the shrapnel.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

本发明涉及一种优化EMI屏蔽性能的光模块及光模块电磁屏蔽结构，该光模块包括底座、上盖以及由解锁拉手与活动解锁件连接而成的解锁装置，底座与上盖对接卡固形成用于容纳活动解锁件两侧的解锁滑片的限位槽，解锁滑片对应滑动配合在限位槽中，每侧解锁滑片的上端设有第一缺口，用于为底座上设有的底座EMI凸台让位，每侧解锁滑片的下端设有第二缺口，用于为上盖上设有的上盖EMI凸台让位，使与光模块配合的鼠笼入口每侧的三片内侧弹片分别一一对应与底座EMI凸台、解锁滑片、上盖EMI凸台接触。本发明考虑鼠笼的弹片设计特点，优化了光模块的活动解锁件与鼠笼弹片配合的结构，从而减小鼠笼与光模块配合的缝隙，从而提升光模块与鼠笼的屏蔽效能。

Description

优化EMI屏蔽性能的光模块及光模块电磁屏蔽结构 技术领域
本发明属于光电技术领域，具体涉及一种优化EMI屏蔽性能的光模块及光模块电磁屏蔽结构。
背景技术
当前的5G通信以及云计算大数据相关应用需求下，光模块的传输速率越来越高(信号频率越来越高，目前的400G模块基频可以达到26.56GHZ)，同时模块本身的功耗也越来越高。而伴随着信号频率与模块功耗提高，模块的电磁辐射(EMI)会更强，光模块结构所需要达到的屏蔽能力也需要响应提高，否则无法满足客户侧对于EMI测试的要求。
电磁屏蔽的主要原理即为法拉第笼原理，通过导体形成一个封闭的“笼子”，将电磁辐射的源关在这个“笼子”中，可以允许这个笼子有孔，或者缝隙，但是缝隙的最大长度直接影响这个“笼子”的屏蔽效能。这个缝隙的屏蔽效能通常是由电磁波的波长决定的，波长越长，达到相等的屏蔽效能所允许的缝隙长度越大。根据空气中电磁波波长＝速率÷频率；26.5G频率的电磁波波长为11.32mm。一般的我们结构件可以缝隙达到波长的1/20长度即0.566mm时，屏蔽效能大约可以达到20dB，普通级应用中我们认为这已经达到了结构屏蔽的极限。
光模块的电磁屏蔽方案一般通过将模块插入鼠笼(cage)中，然后将鼠笼扣装在单板上从而实现屏蔽的效果。作为光模块级的屏蔽方案，首先需要解决光模块结构本身的对内部元器件辐射的屏蔽能力；其次需要解决模块与单板上的鼠笼配合时的屏蔽效能，即保证光模块与鼠笼的四个方向的弹片有良好的接触。通常模块的上下两个面MSA协议要求其为平面，可做优化的空间较小；解锁结 果设计在侧面的光模块，为了保证结构内腔有足够的空间安装器件，一般将解锁结构的滑片设计在结构最外侧，这样侧面的结构就不是一个整体的零件，而是由底座、上盖、解锁装置三部分组成。所以改善光模块与鼠笼之间的屏蔽效能可以通过优化侧面解锁机构区域与鼠笼的接触来实现。
发明内容
本发明的目的在于克服现有技术之缺陷，提供了一种优化EMI屏蔽性能的光模块及光模块电磁屏蔽结构，本发明考虑鼠笼的弹片设计特点，优化了光模块的活动解锁件与鼠笼弹片配合结构，从而减小鼠笼与光模块配合的缝隙，从而提升光模块与鼠笼的屏蔽效能。
本发明的技术方案是这样实现的：本发明公开了一种优化EMI屏蔽性能的光模块，包括底座、上盖以及由解锁拉手与活动解锁件连接而成的解锁装置，所述底座与上盖对接卡固形成用于容纳活动解锁件两侧的解锁滑片的限位槽，所述解锁滑片对应滑动配合在所述限位槽中，每侧解锁滑片的上端设有第一缺口，用于为底座上设有的底座EMI凸台让位，每侧解锁滑片的下端设有第二缺口，用于为上盖上设有的上盖EMI凸台让位，使与光模块配合的鼠笼入口每侧的三片内侧弹片分别一一对应独立与底座EMI凸台、解锁滑片、上盖EMI凸台接触。
进一步地，所述鼠笼入口每侧的三片内侧弹片中上、下两个内侧弹片之间的距离为d，每侧解锁滑片的第一缺口与第二缺口上下对称设置，使第一缺口、第二缺口处的解锁滑片的上下宽度d2小于或等于d。
进一步地，光模块每侧的底座EMI凸台、解锁滑片、上盖EMI凸台与鼠笼入口对应侧的三片内侧弹片的有效配合长度L需满足光模块每侧的底座EMI凸台、解锁滑片、上盖EMI凸台分别与鼠笼入口对应侧的三片内侧弹片的最高点分别一一对应独立接触。
进一步地，所述底座上设有EMI隔断凸起，所述解锁滑片上设有EMI隔断槽，EMI隔断槽沿滑动方向延伸，所述底座上的EMI隔断凸起滑动配合在解锁滑片的EMI隔断槽中。
进一步地，所述EMI隔断凸起位于底座EMI凸台与上盖EMI凸台之间。
进一步地，每侧解锁滑片的端头设有用于实现解锁功能的解锁弹片。
进一步地，所述解锁滑片上设有解锁行程控制槽，所述底座上设有解锁行程控制凸台，所述底座上的解锁行程控制凸台滑动配合在解锁滑片的解锁行程控制槽中，确保活动解锁件运动过程中与底座上的解锁行程控制凸台配合，实现行程控制功能，同时限位活动解锁件的运动方向。
进一步地，所述解锁滑片靠近端头设有向上延伸的上凸起和向下延伸的下凸起，所述底座设有用于与解锁滑片的上凸起滑动配合的限位凹槽，所述上盖设有用于与解锁滑片的下凸起滑动配合的限位凹槽，所述解锁滑片的上凸起伸入底座对应的限位凹槽中，所述解锁滑片的下凸起伸入上盖对应的限位凹槽中，确保解锁滑片在运动过程不会脱出限位槽。
进一步地，所述底座上设有弹簧安装槽，弹簧安装槽内设有弹簧，所述活动解锁件设有复位滑片用于遮挡弹簧安装槽的槽口，且活动解锁件的复位滑片上设有弹簧拨片，活动解锁件的弹簧拨片伸入弹簧安装槽内，用于压缩弹簧，通过弹簧给活动解锁件提供复位的力。
复位滑片横跨在两解锁滑片之间，复位滑片的两侧分别与两侧的解锁滑片连接。
本发明还公开了一种光模块电磁屏蔽结构，包括鼠笼以及如上所述的光模块，所述光模块插入鼠笼中，鼠笼入口左右两侧的三片内侧弹片分别一一对应独立与光模块左右两侧的底座EMI凸台、解锁滑片、上盖EMI凸台接触。
进一步地，光模块每侧的底座EMI凸台、解锁滑片、上盖EMI凸台分别与鼠笼入口对应侧的三片内侧弹片的最高点分别一一对应独立接触。
本发明至少具有如下有益效果：由于本发明的光模块的每侧解锁滑片的上端设有第一缺口，用于为底座上设有的底座EMI凸台让位，每侧解锁滑片的下端设有第二缺口，用于为上盖上设有的上盖EMI凸台让位，使与光模块配合的鼠笼入口每侧的三片内侧弹片分别一一对应独立与底座EMI凸台、解锁滑片、上盖EMI凸台接触。本发明提供的这个结构方案可以保证鼠笼每侧的三片内侧弹片分别独立与三个零件接触，从而减小鼠笼与光模块配合的缝隙，可以有效的提高光模块与鼠笼的屏蔽效能。
本发明的底座上设置EMI隔断点，可以打断解锁滑片(钣金)与底座之间的配合间隙，将缝隙缩短一半，提升屏蔽效能。EMI隔断槽是确保在解锁拉环运动过程中解锁滑片不会与底座上的EMI隔断凸起干涉。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为本发明实施例提供的优化EMI屏蔽性能的光模块的结构示意图；
图2为图1的P部放大图；
图3为图1的俯视图；
图4为本发明实施例提供的光模块的底座与上盖对接卡固后的立体图；
图5为图4的侧视图；
图6为图4的俯视图；
图7为本发明实施例提供的光模块的解锁装置的侧视图；
图8为图7的俯视图；
图9为鼠笼的结构示意图；
图10为本发明实施例提供的鼠笼一侧的三片内侧弹片与光模块的结构件配合的示意图；
图11为传统鼠笼一侧的三片内侧弹片与光模块的结构件配合的示意图；
图12为本发明实施例提供的光模块的解锁滑片与底座之间接触缝隙示意图；
图13为传统光模块的解锁滑片与底座之间接触缝隙示意图。
附图中，1为底座，11为底座EMI凸台，12为EMI隔断凸起，13为解锁行程控制凸台，14为弹簧安装槽，2为解锁装置，21为解锁拉手，22为活动解锁件，221为解锁滑片，222为复位滑片，223为解锁弹片，224为上凸起，225为下凸起，226为EMI隔断槽，227为解锁行程控制槽，228为弹簧拨片，3为上盖，31为上盖EMI凸台，4为弹簧，5为鼠笼，51为内侧弹片，52为外侧弹片。
具体实施方式
下面对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
实施例一
参见图1至图8，本发明实施例提供一种优化EMI屏蔽性能的光模块，包括底座1、上盖3以及由解锁拉手21与活动解锁件22连接而成的解锁装置2，所述底座1与上盖3对接卡固形成用于容纳活动解锁件22两侧的解锁滑片221的 限位槽，所述解锁滑片221对应滑动配合在所述限位槽中，每侧解锁滑片221的上端设有第一缺口，用于为底座1上设有的底座EMI凸台11让位，每侧解锁滑片221的下端设有第二缺口，用于为上盖3上设有的上盖EMI凸台31让位，使与光模块配合的鼠笼5入口每侧的三片内侧弹片51分别一一对应独立与底座EMI凸台11、解锁滑片221、上盖EMI凸台31接触。
在底座1上设置底座EMI凸台11目的是增加底座1与鼠笼对应弹片的接触区域，在上盖3上设置上盖EMI凸台31目的是增加上盖3与鼠笼对应弹片的接触区域。
进一步地，所述鼠笼入口每侧的三片内侧弹片51中上、下两个内侧弹片51之间的距离为d，每侧解锁滑片221的第一缺口与第二缺口上下对称设置，使该处的解锁滑片221的上下宽度d2小于或等于d。
所述第一缺口、第二缺口为等腰梯形。底座EMI凸台11、上盖EMI凸台31为等腰梯形。
同侧底座EMI凸台11的下端面与上盖EMI凸台31的上端面之间的间距大于d2。
进一步地，光模块每侧的底座EMI凸台11、解锁滑片221、上盖EMI凸台31与鼠笼5入口对应侧的三片内侧弹片51的有效配合长度L需满足光模块每侧的底座EMI凸台11、解锁滑片221、上盖EMI凸台31分别与鼠笼5入口对应侧的三片内侧弹片51的最高点分别一一对应独立接触。
进一步地，所述底座1上设有EMI隔断凸起12，所述解锁滑片221上设有EMI隔断槽226，EMI隔断槽226沿滑动方向延伸，所述底座1上的EMI隔断凸起12滑动配合在解锁滑片221的EMI隔断槽226中。EMI隔断槽226是确保在解锁拉环运动过程中解锁滑片221不会与底座1上的EMI隔断凸起12干涉。 所述EMI隔断凸起12位于底座EMI凸台11与上盖EMI凸台31之间。底座1上设置EMI隔断点(EMI隔断凸起12)，可以打断解锁滑片221(钣金)与底座1之间的配合间隙，将缝隙缩短一半，提升屏蔽效能。
参见图12、图13，光模块的底座1与活动解锁件22的配合本身是会存在间隙的，这个缝隙在未做改进是其缝隙长度为L1，增加EMI隔断凸起12之后，将缝隙L1变成了L2+L3，缩短了配合的缝隙长度。由屏蔽原理提高结构屏蔽效能主要方式就是尽可能缩短配合的缝隙。
进一步地，每侧解锁滑片221的端头设有用于实现解锁功能的解锁弹片223，使对应的鼠笼弹片脱离光模块弹起，实现光模块与鼠笼解锁功能。底座1上具有解锁区域主要用于安装解锁弹片223。
进一步地，所述解锁滑片221上设有解锁行程控制槽227，所述底座1上设有解锁行程控制凸台13，所述底座1上的解锁行程控制凸台13滑动配合在解锁滑片221的解锁行程控制槽227中，用于确保活动解锁件22运动过程中与底座1上的解锁行程控制凸台13配合，实现行程控制功能，同时限位活动解锁件22的运动方向。底座1上设置解锁行程控制凸台13主要用于保证解锁装置2安装后可以与底座1组装为一体，不脱出，同时控制解锁装置2的运动行程，承受解锁拉拔力。
进一步地，所述解锁滑片221靠近端头设有向上延伸的上凸起224和向下延伸的下凸起225，所述底座1设有用于与解锁滑片221的上凸起224滑动配合的限位凹槽，所述上盖3设有用于与解锁滑片221的下凸起225滑动配合的限位凹槽，所述解锁滑片221的上凸起224伸入底座1对应的限位凹槽中，所述解锁滑片221的下凸起225伸入上盖3对应的限位凹槽中，确保解锁滑片221在运动过程不会脱出限位槽。
进一步地，所述底座1上设有弹簧安装槽14，弹簧安装槽14内设有弹簧4，所述活动解锁件22设有复位滑片222用于遮挡弹簧安装槽14的槽口，且活动解锁件22的复位滑片222上设有弹簧拨片228，活动解锁件22的弹簧拨片228伸入弹簧安装槽14内，用于压缩弹簧，通过弹簧给活动解锁件22提供复位的力。
本实施例的解锁装置2由两种材料组成，解锁拉手21为塑胶拉手，用以拉拔操作；活动解锁件22为钣金滑片，主要用以实现解锁功能以及EMI屏蔽。活动解锁件22包括两解锁滑片221以及复位滑片222，复位滑片222横跨在两解锁滑片221之间，复位滑片222的两侧分别与两侧的解锁滑片221连接。解锁滑片221以及复位滑片222均为钣金滑片。
实施例二
参见图1至图9，本实施例还公开了一种光模块电磁屏蔽结构，包括鼠笼5以及如实施例一所述的光模块，所述光模块插入鼠笼5中，鼠笼5入口左右两侧的三片内侧弹片51分别一一对应独立与光模块左右两侧的底座EMI凸台11、解锁滑片221、上盖EMI凸台31接触。
进一步地，光模块每侧的底座EMI凸台11、解锁滑片221、上盖EMI凸台31分别与鼠笼5入口对应侧的三片内侧弹片51的最高点分别一一对应独立接触。
与光模块配合的鼠笼5设有外侧弹片52和内侧弹片51，与光模块配合的鼠笼的左右两侧均设计有等宽等间距的三段式内侧弹片51。本发明改进后的光模块可以保证该三段式内侧弹片51可以分别与三段结构件(底座EMI凸台11、解锁滑片221、上盖EMI凸台31)接触，避免同一弹片同时横跨两个零件，由于配合公差导致接触不良，影响屏蔽效能。附图2为本发明设计的EMI屏蔽区 域缩放图，底座1侧面的上端面与底座EMI凸台11的下端面之间的间距为d1，上盖3侧面的下端面与上盖EMI凸台31的上端面之间的间距为d3，d1、d2、d3三段分别与弹片接触，L为三段配合的有效长度，确保与弹片最高点接触。
组装完成后光模块侧面与鼠笼弹片配合区域的放大图如附图2所示，通过控制d1、d2、d3的尺寸，保证侧面的结构的三个部分可以分别与鼠笼的三片弹片接触；因为对组装件而言，三个零件组装成的平面，难以保证其完全在一个平面内，那么如果如果鼠笼的弹片同时与两个零件接触，参见图11，两个零件之间的高度差就会导致鼠笼弹片与其中一个零件的接触不够密切，从而降低了该位置的屏蔽效能；本发明提供的这个结构方案，参见图10，可以保证鼠笼的三片弹片分别独立与三个零件接触，从而避免了这个问题，可以有效的提高此位置的屏蔽效能，附图2中的长度L是为了保证结构可以保证与弹片的最高点接触。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种优化EMI屏蔽性能的光模块，包括底座、上盖以及由解锁拉手与活动解锁件连接而成的解锁装置，所述底座与上盖对接卡固形成用于容纳活动解锁件两侧的解锁滑片的限位槽，所述解锁滑片对应滑动配合在所述限位槽中，其特征在于:每侧解锁滑片的上端设有第一缺口，用于为底座上设有的底座EMI凸台让位，每侧解锁滑片的下端设有第二缺口，用于为上盖上设有的上盖EMI凸台让位，使与光模块配合的鼠笼入口每侧的三片内侧弹片分别一一对应独立与底座EMI凸台、解锁滑片、上盖EMI凸台接触。
  2. 根据权利要求1所述的光模块，其特征在于：所述鼠笼入口每侧的三片内侧弹片中上、下两个内侧弹片之间的距离为d，每侧解锁滑片的第一缺口与第二缺口上下对称设置，使第一缺口、第二缺口处的解锁滑片的上下宽度d2小于或等于d。
  3. 根据权利要求1所述的光模块，其特征在于：光模块每侧的底座EMI凸台、解锁滑片、上盖EMI凸台与鼠笼入口对应侧的三片内侧弹片的有效配合长度L需满足光模块每侧的底座EMI凸台、解锁滑片、上盖EMI凸台分别与鼠笼入口对应侧的三片内侧弹片的最高点分别一一对应独立接触。
  4. 根据权利要求1所述的光模块，其特征在于：所述底座上设有EMI隔断凸起，所述解锁滑片上设有EMI隔断槽，EMI隔断槽沿滑动方向延伸，所述底座上的EMI隔断凸起滑动配合在解锁滑片的EMI隔断槽中。
  5. 根据权利要求1所述的光模块，其特征在于：所述EMI隔断凸起位于底座EMI凸台与上盖EMI凸台之间。
  6. 根据权利要求1所述的光模块，其特征在于：每侧解锁滑片的端头设有用于实现解锁功能的解锁弹片；所述解锁滑片上设有解锁行程控制槽，所述底座上设有解锁行程控制凸台，所述底座上的解锁行程控制凸台滑动配合在解锁 滑片的解锁行程控制槽中，确保活动解锁件运动过程中与底座上的解锁行程控制凸台配合，实现行程控制功能，同时限位活动解锁件的运动方向。
  7. 根据权利要求1所述的光模块，其特征在于：所述解锁滑片靠近端头设有向上延伸的上凸起和向下延伸的下凸起，所述底座设有用于与解锁滑片的上凸起滑动配合的限位凹槽，所述上盖设有用于与解锁滑片的下凸起滑动配合的限位凹槽，所述解锁滑片的上凸起伸入底座对应的限位凹槽中，所述解锁滑片的下凸起伸入上盖对应的限位凹槽中，确保解锁滑片在运动过程不会脱出限位槽。
  8. 根据权利要求1所述的光模块，其特征在于：所述底座上设有弹簧安装槽，弹簧安装槽内设有弹簧，所述活动解锁件设有复位滑片用于遮挡弹簧安装槽的槽口，且活动解锁件的复位滑片上设有弹簧拨片，活动解锁件的弹簧拨片伸入弹簧安装槽内，用于压缩弹簧，通过弹簧给活动解锁件提供复位的力。
  9. 一种光模块电磁屏蔽结构，其特征在于：包括鼠笼以及如权利要求1至8任一所述的光模块，所述光模块插入鼠笼中，鼠笼入口左右两侧的三片内侧弹片分别一一对应独立与光模块左右两侧的底座EMI凸台、解锁滑片、上盖EMI凸台接触。
  10. 根据权利要求9所述的光模块电磁屏蔽结构，其特征在于：光模块每侧的底座EMI凸台、解锁滑片、上盖EMI凸台分别与鼠笼入口对应侧的三片内侧弹片的最高点分别一一对应独立接触。
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CN117289411A (zh) * 2023-10-09 2023-12-26 四川泰瑞创通讯技术股份有限公司 优化emi屏蔽性能的光电转换器

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