TOSA shell packaging structure

Abstract

The utility model discloses a TOSA housing packaging structure, which relates to the technical field of TOSA housings and comprises a ceramic substrate, and the top of the ceramic substrate is provided with a plastic housing. A ceramic side plate is arranged at one end of the top of the ceramic substrate and located in the plastic shell, the middle of the ceramic side plate is connected with a metal light window, and one end of the metal light window penetrates through the side wall of the plastic shell and extends out of the plastic shell. The ceramic substrate comprises a substrate main body, a ceramic substrate metal wire and a ceramic substrate bayonet; each ceramic side plate comprises a side plate main body, a ceramic side plate bayonet and a ceramic side plate connecting hole; the metal light window comprises a metal light window body, a light hole and a metal light window outer side wall. According to the TOSA shell packaging structure provided by the utility model, the process difficulty is reduced, the material cost is saved, miniaturization of a packaging body is facilitated, the assembling process steps are simplified, the assembling precision is higher, and the TOSA shell packaging structure is easier to control.

Description

TECHNICAL FIELD

[0001] The utility model relates to TOSA shell technical field, specifically, relate to a TOSA shell package structure. BACKGROUND

[0002] Box TOSA (Transmitter Optical Subassembly, optical transmitting assembly) package shell usually adopts metal wall-ceramic insulator structure, and the metal wall is slotted and welded with the ceramic insulator, the internal wiring of the ceramic insulator realizes the internal and external transmission of electric signal, and the other end of the metal wall is provided with a light window, which is used for assembling optical devices such as lenses, optical isolators and the like, to provide a coupling unit for optical information transmission, the internal metal wall is connected with a metal heat dissipation base to provide mechanical support and photoelectric signal conversion and processing unit, as shown in Figure 8 .

[0003] The current metal wall-ceramic insulator structure has the following shortcomings:

[0004] 1. High matching requirement for material: the ceramic insulator is welded on the metal wall by brazing to form a metal frame, and then welded with a metal base, generally high-temperature brazing needs 800 DEG C or above, stress will be generated during the process, even deformation, affecting product reliability, so the metal wall needs to use expensive Kovar metal.

[0005] 2. Expensive material: the metal wall and the ceramic insulator need to be welded by high-temperature brazing, the wall uses expensive Kovar metal, and the light window needs to be provided on the metal wall and the ceramic insulator needs to be slotted, generally needs to be cast by mold and processed by lathe, high precision requirement, high cost.

[0006] 3. Small package operation space: when making TOSA, the chip packaging and wiring, and the electrical connection of other components in the shell can only be carried out, and the internal wiring of the ceramic insulator needs to be connected with the metal wire by ultrasonic welding process, the operation space is only 5-10mm, which increases the difficulty of packaging and reduces the efficiency.

[0007] 4. Complex process: after the assembly and welding of the metal wall, the ceramic insulator and the metal base, oxidation resistance treatment needs to be carried out, and after the assembly of internal components and electrical circuit and the completion of optical coupling, the metal cover needs to be installed for sealing, the process is complex.

[0008] 5. Miniaturization limit: with the rapid development of the optical communication industry, the increase in transmission speed, and the packaging requirements of high transmission rate and more miniaturized optical modules, including the miniaturization of TOSA, the packaging shell needs to be more miniaturized. The traditional shell process needs to assemble the chips, wiring, optical coupling, etc. in the interior after the shell is completely assembled, which requires a certain operation space, so there is a relatively obvious limit in miniaturization.

[0009] At present, there is no effective solution to the problems in the related art. Content of the utility model

[0010] In view of the problems in the related art, the utility model provides a TOSA shell packaging structure to overcome the above technical problems existing in the prior art.

[0011] Therefore, the utility model adopts the specific technical scheme as follows:

[0012] A TOSA shell packaging structure, comprising a ceramic substrate, a plastic shell is arranged at the top of the ceramic substrate; a ceramic side plate is arranged at one end of the top of the ceramic substrate and in the plastic shell, a metal light window is connected to the middle part of the ceramic side plate, and one end of the metal light window penetrates through the side wall of the plastic shell and extends to the outside of the plastic shell.

[0013] Further, in order to form the main base of the plastic shell, the ceramic substrate comprises a substrate main body arranged at the bottom of the plastic shell, a ceramic substrate metal wiring is arranged at one end of the substrate main body, and a ceramic substrate bayonet is arranged at one end of the substrate main body.

[0014] Further, in order to connect the metal light window, the ceramic side plate comprises a side plate main body arranged at one end of the top of the ceramic substrate, a ceramic side plate bayonet matched with the ceramic substrate bayonet is arranged at the bottom end of the side plate main body, and a ceramic side plate connecting hole is arranged in the middle part of the side plate main body.

[0015] Further, in order to form the right light channel part of the plastic shell, the metal light window comprises a metal light window main body connected with the ceramic side plate connecting hole, a light transmission hole is arranged in the interior of the metal light window main body, and a metal light window outer side wall is arranged at one end of the metal light window main body close to the interior of the plastic shell.

[0016] Further, in order to adapt the plastic shell to the ceramic substrate and the metal light window, a plastic shell first bayonet matched with the metal light window main body is arranged at one end of the plastic shell close to the metal light window main body; and a plastic shell second bayonet matched with the ceramic substrate metal wiring is arranged at one end of the plastic shell close to the ceramic substrate metal wiring.

[0017] The utility model has the advantages of:

[0018] 1. The utility model uses the ceramic substrate with wiring, replaces the original metal bottom plate and ceramic insulator, reduces the process difficulty, saves the material cost, and the process of ceramic substrate is relatively simple, the material is easy to get, and mass production is available.

[0019] 2. The ceramic side plate matches the metal light window, and after assembling with the ceramic substrate, the internal components and light coupling can be assembled, the operation in the narrow space is avoided, the operability and convenience of packaging are greatly increased, and the miniaturization of the package is more favorable.

[0020] 3. The plastic part is integrally packaged, the expensive Kovar metal wall and cover are replaced, the re-covering packaging process is saved, the number of shell accessories is reduced, the assembly process steps are simplified, the thermal expansion stress of the plastic shell is reduced, and the stress matching requirement of the ceramic substrate and the side plate is more flexible.

[0021] 4. The traditional metal wall generally needs to be welded with the ceramic insulator at 800 DEG C high temperature to form a frame structure, the utility model does not need high temperature during assembly, each part is assembled into a shell directly by using an adhesive, the problem of serious deformation of the metal wall and the ceramic insulator after combination due to high temperature can be avoided, the problem of large size deviation caused by the traditional process can be avoided, the assembly precision is higher, and the control is easier. DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiments will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0023] Figure 1 It is a structure schematic view of a TOSA shell packaging structure according to the utility model embodiment;

[0024] Figure 2 It is a structure schematic view of another angle of a TOSA shell packaging structure according to the utility model embodiment;

[0025] Figure 3 It is a sectional view of a TOSA shell packaging structure according to the utility model embodiment;

[0026] Figure 4 It is a structure schematic view of a ceramic substrate in a TOSA shell packaging structure according to the utility model embodiment;

[0027] Figure 5 It is a structure schematic view of a ceramic side plate in a TOSA shell packaging structure according to the utility model embodiment;

[0028] Figure 6 is a structure schematic view of a plastic shell in a TOSA shell packaging structure according to an embodiment of the present application;

[0029] Figure 7 is a structure schematic view of a metal light window in a TOSA shell packaging structure according to an embodiment of the present application;

[0030] Figure 8 is a schematic view of an existing box type TOSA packaging shell.

[0031] In the drawings:

[0032] 1, ceramic substrate; 101, substrate main body; 102, ceramic substrate metal wiring; 103, ceramic substrate bayonet; 2, plastic shell; 3, ceramic side plate; 301, side plate main body; 302, ceramic side plate bayonet; 303, ceramic side plate connecting hole; 4, metal light window; 401, metal light window main body; 402, light transmission hole; 403, metal light window outer side wall; 5, plastic shell first bayonet; 6, plastic shell second bayonet; 7, metal cover; 8, metal wall; 9, metal base; 10, ceramic insulator. DETAILED DESCRIPTION

[0033] To further illustrate the embodiments, the present application provides drawings which are part of the disclosure of the present application, mainly used to illustrate the embodiments, and can be used to explain the operating principle of the embodiments in conjunction with the related description of the specification. With reference to these contents, those skilled in the art should be able to understand other possible embodiments and advantages of the present application. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0034] According to the embodiments of the present application, a TOSA shell packaging structure is provided. The demand for TOSA by optical modules is increasing, and the cost and reliability requirements are also increasing. As an important component, the packaging shell is particularly important, so a low-cost, high-reliability, and smaller packaging shell is of great significance.

[0035] The present application will be further described in conjunction with the drawings and specific embodiments, as shown in Figures 1-7 The TOSA shell packaging structure according to the embodiments of the present application includes a ceramic substrate 1, and the top of the ceramic substrate 1 is provided with a plastic shell 2. The top of the ceramic substrate 1 is provided with a ceramic side plate 3 at one end and in the plastic shell 2, the ceramic side plate 3 is connected with a metal light window 4, and one end of the metal light window 4 penetrates through the side wall of the plastic shell 2 and extends to the outside of the plastic shell 2.

[0036] With the aid of the above scheme, the TOSA shell packaging structure provided by the utility model reduces the process difficulty, saves the material cost, is more favorable to the miniaturization of the package body, simplifies the assembly process step, is higher in assembly precision, and is easier to control.

[0037] In one embodiment, for the above-mentioned ceramic substrate 1, the ceramic substrate 1 comprises a substrate main body 101 arranged at the bottom of the plastic shell 2, one end of the substrate main body 101 is provided with a ceramic substrate metal wiring 102, and one end of the substrate main body 101 is provided with a ceramic substrate bayonet 103, thereby forming the main body base of the plastic shell 2.

[0038] In one embodiment, for the above-mentioned ceramic side plate 3, the ceramic side plate 3 comprises a side plate main body 301 arranged at one end of the top of the ceramic substrate 1, the bottom end of the side plate main body 301 is provided with a ceramic side plate bayonet 302 matched with the ceramic substrate bayonet 103, and the middle part of the side plate main body 301 is provided with a ceramic side plate connecting hole 303, thereby being used for connecting the metal light window 4.

[0039] In one embodiment, for the above-mentioned metal light window 4, the metal light window 4 comprises a metal light window main body 401 connected with the ceramic side plate connecting hole 303, the inside of the metal light window main body 401 is provided with a light transmission hole 402, and one end of the metal light window main body 401 close to the inside of the plastic shell 2 is provided with a metal light window outer side wall 403, thereby forming the right side light passage part of the plastic shell 2.

[0040] In one embodiment, for the above-mentioned plastic shell 2, one end of the plastic shell 2 close to the metal light window main body 401 is provided with a plastic shell first bayonet 5 matched with the metal light window main body 401; and one end of the plastic shell 2 close to the ceramic substrate metal wiring 102 is provided with a plastic shell second bayonet 6 matched with the ceramic substrate metal wiring 102, thereby making the plastic shell 2 adapt to the ceramic substrate 1 and the metal light window 4.

[0041] The ceramic substrate 1 is made of Al2O3 material (alumina material), has the advantages of high strength, high temperature resistance, thermal shock resistance, electrical insulation and performance, and is cheap and easy to obtain; a specific size and thickness are set by using a ceramic substrate process, and a metal wiring is formed by using a DBC process (Direct Bonded Copper, which is a direct copper bonding technology), as a bottom plate of a packaging structure, for a substrate and heat dissipation of an internal packaging structure, the ceramic substrate metal wiring 102 is used for electrical connection of internal packaging, to form conduction of internal and external electrical signals, and the ceramic substrate bayonet 103 of the ceramic substrate 1 is used for the ceramic side plate bayonet 302 of the ceramic side plate 3 to be matched and bonded.

[0042] The ceramic side plate 3 is made of Al2O3, and is made into a specific size and thickness by using a ceramic substrate process; a ceramic side plate bayonet 302 is arranged on the ceramic side plate 3 and is used for bonding with a ceramic substrate bayonet 103 of the ceramic substrate 1; and a ceramic side plate connecting hole 303 in a circular shape is arranged on the ceramic side plate 3 and is used for bonding with the metal light window 4.

[0043] The metal light window 4 is made of a nickel-based super-high-temperature alloy and can withstand high temperature above 900 DEG C; the coating is dense, and the bonding strength is large; and the metal light window 4 is obtained by a CNC process (Computer Numerical Control).

[0044] The plastic shell 2 is made of an engineering plastic integrated forming process and is formed into a shell; and the plastic shell 2 is made of LCP MT, GF30 composite material, which is a kind of high polymer material and has the advantages of high temperature resistance and high elastic modulus, good mechanical properties, good dimensional stability, low thermal expansion coefficient and the like.

[0045] A packaging method based on a TOSA shell structure comprises the following steps:

[0046] 1. An adhesive is coated on the inner wall of the ceramic side plate connecting hole 303 of the ceramic side plate 3 and the annular outer wall of the metal light window 4; then the metal light window 4 is inserted into the ceramic side plate connecting hole 303; the metal light window 4 is bonded to the ceramic side plate 3; and the adhesive used is an epoxy adhesive.

[0047] 2. An adhesive is further coated on the inner side of the ceramic side plate bayonet 302 of the ceramic side plate 3 and the inner side of the ceramic substrate bayonet 103; after the two are connected, the two are bonded together; the ceramic substrate 1 and the ceramic side plate 3 are bonded in a perpendicular state; and the adhesive used is an epoxy adhesive.

[0048] 3. After the internal device packaging and optical coupling of the existing ceramic substrate 1 and the ceramic side plate 3 are completed, the device is in a state of being ready to be sealed in a shell; an adhesive is coated on the side surface of the ceramic substrate 1 and the outer surface of the ceramic side plate 3; the convex part of the metal light window 4 is connected to the first bayonet 5 of the plastic shell; finally, the plastic shell 2 is inserted into the plastic shell 2, so that the inner wall of the plastic shell 2 is bonded to the outer wall of the ceramic substrate 1 and the ceramic side plate 3; and the adhesive used is an epoxy adhesive.

[0049] In order to facilitate the understanding of the above technical scheme of the utility model, the working principle or operation mode of the utility model in the actual process will be described in detail.

[0050] In actual application, the ceramic substrate 1, the plastic shell 2, the ceramic side plate 3 and the metal light window 4 are assembled and sealed, specifically by using an adhesive, so that a sealed space for the TOSA and the circuit is formed in the packaging shell composed of the ceramic substrate 1 and the plastic shell 2.

[0051] The diameter of the outer surface of the metal light window 4 is adapted to the size of the ceramic side plate connecting hole 303 of the ceramic side plate 3. The inner wall of the ceramic side plate connecting hole 303 is coated with adhesive. The outer side of the metal light window 4 is coated with adhesive. The outer side of the metal light window passes through the ceramic side plate connecting hole 303. The outer side wall of the metal light window 4 is tightly attached to the inner vertical surface of the ceramic side plate 3, forming the right side light passage part of the shell.

[0052] The ceramic substrate socket 103 and the ceramic side plate socket 302 are adapted in size. The inner wall of the ceramic side plate socket 302 is coated with adhesive. The inner wall of the ceramic substrate socket 103 is coated with adhesive. The ceramic substrate socket 103 and the ceramic side plate socket 302 are then fitted together. The ceramic side plate 3 is perpendicular to the ceramic substrate 1. The inner vertical surface of the ceramic side plate 3 is tightly attached to the inner wall of the ceramic substrate socket 103, and they are bonded together. After the adhesive is cured, the main base of the packaging shell is formed.

[0053] On the structure of the ceramic substrate 1, the ceramic side plate 3, and the metal light window 4, the internal components of the TOSA can be assembled and optically coupled. After assembly is complete, adhesive is applied to the side wall of the ceramic substrate 1 and to the outer vertical surface of the ceramic side plate 3. The size of the plastic shell is adapted to the size of the packaged main base composed of the ceramic substrate 1, the ceramic side plate 3, and the metal light window 4.

[0054] The second socket 6 of the plastic shell is matched in size with the position of the ceramic substrate metal wiring 102. The first socket 5 of the plastic shell is matched in size with the position of the metal light window 4. The second socket 6 of the plastic shell is aligned with the position of the ceramic substrate metal wiring 102. The first socket 5 of the plastic shell is aligned with the position of the metal light window 4. The packaged main base composed of the ceramic substrate 1, the ceramic side plate 3, and the metal light window 4 is inserted into the plastic shell 2. The inner surface of the plastic shell 2 is tightly bonded to the outer vertical surface of the ceramic side plate. The inner surface of the plastic shell 2 is tightly bonded to the side wall of the ceramic substrate 1, forming the final TOSA packaging structure.

[0055] The adhesive used is epoxy adhesive 100 Plus, which is transparent after drying. The adhesive reaches operating strength in about 20 minutes and fully cures within 48 hours (72℉ / 22℃). It has high shear strength, strength, and rigidity.

[0056] Overall:

[0057] 1. The ceramic substrate 1 with ceramic substrate metal wiring 102 and ceramic substrate socket 103 is used as the bottom material of the packaging shell, replacing and simplifying the traditional packaging structure of ceramic insulator 10 and metal bottom plate, reducing cost and packaging process complexity.

[0058] 2. The ceramic side plate 3 is combined with the ceramic substrate 1 to form an open shell structure, which facilitates the assembly and optical coupling of internal components, greatly improves the operation space, and avoids the space limitation of the original metal wall 8.

[0059] 3. The integrally formed plastic shell 2 replaces the original Kovar material metal wall 8 and metal cover 7, simplifies the packaging process, and reduces material costs.

[0060] 4. The entire packaging shell can be assembled at room temperature using an adhesive, and the structure is stable, without the thermal stress problem of traditional packaging, improving the reliability of the plastic shell 2 and internal components.

[0061] In addition, Figure 8 In the above, 7 is a metal cover; 8 is a metal wall; 9 is a metal base; 10 is a ceramic insulator; and 4 is a metal light window.

[0062] As described above, the TOSA packaging shell and packaging method provided by the present application have the advantages of easy material acquisition, convenient assembly operation, and improved reliability. The present application provides a TOSA packaging shell with smaller size, cheaper material, simpler packaging process, and higher reliability. The adhesive process is used to avoid the stress problem of the metal wall 8 and the ceramic insulator 10 caused by high-temperature brazing. The TOSA packaging shell provided by the present application includes a ceramic substrate 1 with a ceramic substrate metal wiring 102 and a ceramic substrate bayonet 103, a ceramic side plate with a ceramic side plate connecting hole 303, a metal light window 4, and a plastic shell 2. The metal light window 4 is assembled with the ceramic side plate 3, and the ceramic substrate 1 is assembled with the ceramic side plate 3 and the plastic shell 2. The above-mentioned packaging structure is used to package the internal circuit and the sealed space of the TOSA.

[0063] In the present application, unless otherwise specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screwed", and the like should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise specified, the above-mentioned terms in the present application can be understood according to the specific meaning of the above-mentioned terms in the present application.

[0064] The above-mentioned is only a preferred embodiment of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A TOSA housing package structure comprising a ceramic substrate (1), characterized in that, The top of the ceramic substrate (1) is provided with a plastic shell (2); One end of the top of the ceramic substrate (1) and inside the plastic shell (2) is provided with a ceramic side plate (3), the middle of the ceramic side plate (3) is connected with a metal light window (4), and one end of the metal light window (4) penetrates through the side wall of the plastic shell (2) and extends to the outside of the plastic shell (2).

2. The TOSA housing package structure of claim 1, wherein, The ceramic substrate (1) includes a substrate main body (101) provided at the bottom of the plastic shell (2), one end of the substrate main body (101) is provided with a ceramic substrate metal wiring (102), and one end of the substrate main body (101) is provided with a ceramic substrate bayonet (103).

3. The TOSA housing package structure of claim 2, wherein, The ceramic side plate (3) includes a side plate main body (301) provided at one end of the top of the ceramic substrate (1), the bottom end of the side plate main body (301) is provided with a ceramic side plate bayonet (302) matched with the ceramic substrate bayonet (103), and the middle of the side plate main body (301) is provided with a ceramic side plate connecting hole (303).

4. The TOSA housing package structure of claim 3, wherein, The metal light window (4) includes a metal light window main body (401) connected with the ceramic side plate connecting hole (303), the inside of the metal light window main body (401) is provided with a light transmission hole (402), and one end of the metal light window main body (401) close to the inside of the plastic shell (2) is provided with a metal light window outer side wall (403).

5. The TOSA housing package structure of claim 4, wherein, One end of the plastic shell (2) close to the metal light window main body (401) is provided with a plastic shell first bayonet (5) matched with the metal light window main body (401).

6. The TOSA housing package structure of claim 2 or 5, wherein, One end of the plastic shell (2) close to the ceramic substrate metal wiring (102) is provided with a plastic shell second bayonet (6) matched with the ceramic substrate metal wiring (102).

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