CN107027249B

CN107027249B - Press-fit jig for MEMS microphone

Info

Publication number: CN107027249B
Application number: CN201710236721.6A
Authority: CN
Inventors: 王志超; 葛修坤; 徐震鸣; 董育智
Original assignee: Wuxi Red Microelectronics Corp Co ltd
Current assignee: Wuxi Red Microelectronics Corp Co ltd
Priority date: 2017-04-12
Filing date: 2017-04-12
Publication date: 2023-06-02
Anticipated expiration: 2037-04-12
Also published as: CN107027249A

Abstract

The invention provides a press-fit jig for an MEMS microphone, which can uniformly press a PCB, so that the stress of the PCB is uniform, the press-fit PCB is compact, the solder paste between the PCB and the PCB is more tightly combined, and the problem of leakage is avoided.

Description

Press-fit jig for MEMS microphone

Technical Field

The invention relates to the technical field of surface mounting, in particular to a pressing jig of an MEMS microphone.

Background

In the prior art, when the standard multilayer PCB stacking type MEMS microphone is manufactured, solder paste is printed on the surface of each layer of PCB, the PCB is locked by bolts after being arranged in a pressing fixture, and then the solder paste is melted, combined and solidified by reflow soldering at a high temperature of 260 ℃, so that the PCB and the PCB are in seamless connection, and MEMS sound leakage can occur if gaps occur.

The standard multilayer PCB stacked MEMS pressing jig is hard in texture, a plurality of screws around the pressing jig serve as all pressure sources when the PCB is pressed up and down, the PCB is pressed by locking the screws, the design only has the force acting up and down on the periphery of the PCB, the pressing jig is made of pure copper, has the advantages of hard texture, difficult deformation and the like, but has the defect that the PCB is not elastic, the defect directly causes the phenomenon that a large area of solder paste is not closed in a region where the screws are not locked on the whole PCB, one main working principle of each MEMS sensor is that the vibrating diaphragm is vibrated through fixed sound inlet holes, at the moment, the distance between the back plate and the vibrating diaphragm is displaced under the action of sound pressure, alternating current signals are generated by changing capacitance values between the two pole plates, the problem of poor sound leakage can be caused if the solder paste is not closed, and the degree of screwing the screws directly influences the sealing of the PCB; moreover, the screws can be locked one by one, so that the other side is not stressed when one end of the pressing jig is pressed, the PCB is not balanced in pressure, the solder paste between the PCB cannot be tightly closed, and the problem of sound leakage occurs.

Disclosure of Invention

In order to solve the problems, the invention provides the pressing jig for the MEMS microphone, which can uniformly press the PCB, so that the stress of the PCB is uniform, the pressed PCB is compact, the solder paste between the PCB is ensured to be more tightly combined, and the problem of sound leakage is avoided.

The technical scheme is as follows: the utility model provides a pressfitting tool of MEMS microphone, is used for the tool top board and the tool holding down plate of pressfitting PCB board including mutually supporting, its characterized in that: the utility model discloses a tool clamp is characterized by comprising a jig upper pressure plate, a jig lower pressure plate, a clamp is arranged on the periphery of the jig upper pressure plate, a lock catch is arranged on the jig lower pressure plate, the lock catch passes through the lock catch respectively the jig upper pressure plate is locked on the jig lower pressure plate, the lock catch comprises a locking rod, the upper end of the locking rod is provided with a rotary shifting block, a spring is sleeved on the locking rod, the lower end of the locking rod is provided with a rotary locking block, the lower surface of the jig lower pressure plate corresponds to the rear side of the lock catch is provided with a locking groove, after the rotary locking block passes through the lock hole, the rotary shifting block enables the two ends of the rotary locking block to avoid the lock hole, and the two ends of the spring are respectively abutted against the upper surface of the rotary shifting block and the jig lower pressure plate to enable the rotary locking block to be clamped in the locking groove.

Further, the locking groove is also provided with a rotation limiting part.

Further, grooves are respectively formed in the upper surface of the upper jig pressing plate and the lower surface of the lower jig pressing plate, and ventilation holes are formed in the grooves.

Furthermore, a positioning pin is arranged on the lower jig pressing plate, and a positioning hole is arranged on the upper jig pressing plate corresponding to the positioning pin.

Further, the upper pressing plate of the jig is provided with anti-reverse mounting screws penetrating through the upper pressing plate of the jig from top to bottom, and the lower pressing plate of the jig is correspondingly provided with anti-reverse mounting holes.

Furthermore, the two sides of the lower pressing plate of the jig are respectively provided with a notch.

According to the pressing jig for the MEMS microphone, the lock catches are arranged to replace screws to lock the upper jig pressing plate and the lower jig pressing plate as the pressing device, so that the PCB is attached, the rotating shifting block can be rotated to lock the upper jig pressing plate and the lower jig pressing plate quickly after the lock catches pass through the lock catches, the problems of unbalanced pressure and leakage caused by incapability of closing solder paste due to the fact that the screws are arranged one by one are avoided, the effect of pressing the PCB tightly can be achieved through the uniform pressure of the springs in the area without the lock catches on the periphery, meanwhile, the lock catches are arranged to enable the assembling of the pressing jig to be convenient and quick, the screw is not required to be screwed, the production efficiency is improved, the rotating limiting parts are arranged on the locking grooves to rotate and limit the rotating locking blocks, the situation that the rotating locking blocks are separated is avoided, and the pressing reliability of the pressing jig is improved.

Drawings

FIG. 1 is a schematic top view of an upper platen of the fixture of the present invention;

FIG. 2 is a schematic view of the bottom structure of the upper platen of the fixture of the present invention;

FIG. 3 is a schematic top view of the lower platen of the fixture of the present invention;

FIG. 4 is a schematic bottom view of the upper and lower clamp plates of the present invention after locking;

fig. 5 is a schematic diagram of a front view structure of the upper clamp plate and the lower clamp plate of the present invention after locking.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 to 5, a press-fit jig for a MEMS microphone of the present invention includes a jig upper plate 1 and a jig lower plate 2 which are engaged with each other to press-fit a PCB board, wherein a lock catch 3 is provided around the jig upper plate 1, the lock catch 4 is provided on the jig lower plate 2 corresponding to the lock catch, the lock catch 3 passes through the lock catch 4 to lock the jig upper plate 1 on the jig lower plate 2, the lock catch 3 includes a lock lever 31, a rotary dial block 32 is provided at an upper end of the lock lever 31, a spring 33 is sleeved on the lock lever 31, a rotary lock block 34 is provided at a lower end of the lock lever 31, a locking groove 6 is provided at a rear side of the corresponding lock hole 4 after the rotary lock block 34 passes through the lock hole 4, both ends of the rotary dial block 34 are prevented from the lock hole 4, both ends of the spring 33 are respectively abutted against an upper surface of the rotary dial block 32 and the jig lower plate 2 to lock the locking groove 6, a rotary limit portion 61 is further provided on the lock groove 6, a jig upper surface of the jig upper plate 1 and the jig lower plate 2 are provided with a notch 7 corresponding to the upper plate 2 and a lower plate 2, and a positioning pin 10 is provided on both sides of the jig upper plate 2 are provided, and a positioning pin 11 is provided on the upper plate 2 corresponding to the upper plate 2 and a positioning pin 2 is provided.

According to the pressing jig for the MEMS microphone, the lock catches are arranged to replace screws to lock the upper jig pressing plate and the lower jig pressing plate so that the PCB is attached, the rotating shifting blocks are rotated to lock the upper jig pressing plate and the lower jig pressing plate after the lock catches pass through the lock catches, the problems that pressure is unbalanced and solder paste cannot be closed to cause sound leakage caused by the fact that the screws are arranged one by one are avoided, the springs are sleeved on the locking rods of the lock catches, so that the pressing of the PCB is more uniform, the solder paste between the PCB and the PCB can be more tightly combined, meanwhile, the lock catches are arranged to enable the assembling of the pressing jig to be convenient and rapid, the production efficiency is improved, the rotating limiting parts are arranged on the locking grooves to rotate and limit the rotating locking blocks, the rotating locking blocks are prevented from being separated, and the pressing reliability of the pressing jig is improved.

Grooves are respectively formed in the upper surface of the upper pressing plate of the jig and the lower surface of the lower pressing plate of the jig, and ventilation holes are arranged in the grooves, so that the jig is thinner, heat conduction of the PCB is better when the PCB passes through the furnace for processing, and the yield is improved.

Set up locating pin and locating hole cooperation on tool top board and the tool holding down plate, can further improve pressfitting tool assembly speed, improve production efficiency, prevent reverse dress screw and prevent reverse dress hole's setting then can avoid the dress of tool top board and tool holding down plate to be reversed, avoid the maloperation, the breach of the both sides of tool holding down plate then can conveniently separate tool top board and tool holding down plate after the processing is accomplished, further improves work efficiency.

After the lamination jig of the MEMS microphone is adopted, the packaging yield of the stacked MEMS microphone is obviously improved; the screw driver is not required to be screwed one by one manually, so that the productivity of production and manufacture is greatly improved; the production cost is low, the market release period is short, each functional module can be designed in advance, and the method can be applied to all products of the existing general stack type in the market in a large quantity, so that the cost is effectively reduced, the design period is shortened, and the method is quick to release in the market; the reliability is high, and simultaneously, a plurality of process technologies such as microelectronic technology, solder paste curing and the like are comprehensively utilized, so that the advantages of various processes are fully exerted. Thereby improving the comprehensive performance of the system.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. The utility model provides a pressfitting tool of MEMS microphone, is used for the tool top board and the tool holding down plate of pressfitting PCB board including mutually supporting, its characterized in that: the device comprises a jig upper pressing plate, a jig lower pressing plate, a locking hole, a locking rod, a rotary locking block, a spring, a locking groove, a rotary shifting block and a locking groove, wherein the locking hole is arranged on the periphery of the jig upper pressing plate, the locking hole is arranged on the jig lower pressing plate corresponding to the locking hole, the locking hole is respectively formed in the jig lower pressing plate, the locking hole is used for locking the jig upper pressing plate on the jig lower pressing plate through the locking hole, the locking rod comprises the locking rod, the rotary shifting block is arranged at the upper end of the locking rod, the spring is sleeved on the locking rod, the rotary locking block is arranged at the lower end of the locking rod, and the locking groove is formed in the lower surface of the jig lower pressing plate and corresponds to the rear side of the locking hole;

the locking groove is also provided with a rotation limiting part;

grooves are respectively formed in the upper surface of the jig upper pressing plate and the lower surface of the jig lower pressing plate.

2. The bonding jig of a MEMS microphone according to claim 1, wherein: and the grooves are provided with ventilation holes.

3. The bonding jig of a MEMS microphone according to claim 1, wherein: the jig lower pressing plate is provided with a positioning pin, and the jig upper pressing plate is provided with a positioning hole corresponding to the positioning pin.

4. The bonding jig of a MEMS microphone according to claim 1, wherein: the fixture upper pressing plate is provided with anti-reverse mounting screws penetrating through the fixture upper pressing plate from top to bottom, and the fixture lower pressing plate is correspondingly provided with anti-reverse mounting holes.

5. The bonding jig of a MEMS microphone according to claim 1, wherein: and notches are respectively arranged on two sides of the lower pressing plate of the jig.