CN112702842B - Base with metal circuit, voice coil motor and manufacturing method - Google Patents

Abstract

The invention is a base with a metal circuit, comprising: the electronic component comprises an electronic component, a metal circuit welded with the electronic component and formed by one-time stamping, and a plastic body integrally injection-molded with the metal circuit, wherein the metal circuit at least comprises three branches, each branch comprises pins with one ends arranged in parallel and at intervals, welding pins with the other ends arranged corresponding to the pins of the electronic component one by one, and a main body part connecting the pins and the welding pins, the arrangement sequence of the first pins, the second pins and the third pins is different from that of the first welding pins, the second welding pins and the third welding pins, and the welding pins of one branch are bent towards the other welding pin direction of the other branch and are overlapped with the projection part of the other welding pin in at least one of the vertical direction or the horizontal direction. According to the invention, through bending one welding foot of the metal circuit, the space spanning is realized and the space overlapping with the other welding foot is realized, so that the arrangement density of the metal circuit is increased.

Description

Base with metal circuit, voice coil motor and manufacturing method

Technical Field

The invention relates to the technical field of metal circuits, in particular to a base with a metal circuit, a voice coil motor and a manufacturing method of the voice coil motor.

Background

As for the conventional base and voice coil motor with a metal circuit, as disclosed in the patent application with the publication number CN108989511A, the base includes an electronic component, a metal circuit, a first plastic part and a second plastic part, the metal circuit is connected to the electronic component and includes a plurality of branches, and the branches are connected to pins of the electronic component in a one-to-one correspondence manner; the first plastic part is positioned at the position where the metal circuit is connected with the electronic element, and connects all branches of the metal circuit into a whole. In another patent application with publication number CN110703536A, a driving mechanism for driving an optical device is disclosed, which includes a fixed module, a movable module for carrying the optical device, a driving module for driving the movable module to move relative to the fixed module, a position sensing module, and a stereo circuit. The fixed module is provided with a base, the position sensing assembly is arranged on the base and used for sensing the movement of the movable module relative to the fixed module, and the three-dimensional circuit is embedded in the base and electrically connected with the position sensing assembly. The metal circuits in the two former cases are single-layer circuits formed by one-step stamping, and the welding pin parts of the single-layer circuits are arranged in a single-layer parallel mode and limited by the forming and arrangement of the single-layer metal circuits, and the space interleaving of the circuits cannot be realized.

In prior art, be provided with the base in the periscopic voice coil driving motor, mould plastics in the base and have the circuit, the circuit includes a plurality of branches, and every branch has two free ends, and one of them free end is for welding the end with electronic component welded, and one end is the pin end in addition, and the pin end of a plurality of branches arranges to be the pin row, and the welding end is arranged according to electronic component's pin design, forms the welding array. Because the pin array sequence and the pin column sequence of the electronic component chip are in a staggered state, the extending section of one branch and the extending section of the other branch are necessarily in a crossed staggered state. Such a problem is commonly found in metal circuits of electronic components of a driving motor circuit, and is more commonly found because there is a sequence change between a pin definition sequence of an electronic component manufacturer and a pin definition sequence of an external PCB. In the prior art, the way of dealing with the technical problem mostly needs to adopt a flexible circuit way, and the spatial overlapping of the lines is completed at the middle extension section, but the manufacturing process and cost of the flexible circuit board are relatively higher than those of the branch of the traditional metal circuit formed by stamping. Therefore, the flexible circuit is not suitable for efficient manufacturing and popularization, and the overall manufacturing cost of the driving motor is high. The other mode is to make double-deck circuit board, but double-deck circuit board needs twice stamping forming and the molding of buckling, also can arouse cost-push to a certain extent, and double-deck circuit still can increase voice coil drive motor's whole thickness, is unfavorable for the miniaturization of voice coil drive motor's whole size.

Therefore, there is a need to provide a new base and voice coil motor with metal circuit and manufacturing method thereof to overcome the above-mentioned drawbacks.

Disclosure of Invention

The invention aims to provide a base with a metal circuit, a voice coil motor and a manufacturing method, which meet the diversified arrangement requirements of the metal circuit.

The purpose of the invention is realized by the following technical scheme one: a submount with metal circuitry comprising: the electronic component comprises an electronic component, a metal circuit welded with the electronic component and formed by one-time stamping, and a plastic body integrally injection-molded with the metal circuit, wherein the metal circuit at least comprises three branches which are respectively a first branch, a second branch and a third branch, one ends of the branches are arranged in parallel at intervals to form pins, the pins of the three branches are positioned on the same side of the plastic body and are arranged in a linear track, the other ends of the three branches are arranged one by one corresponding to the pins of the electronic component to form welding pins, the welding pins of the three branches are connected with the same electronic component and are arranged in a rectangular track, the plane where the welding pins are positioned is defined as a welding plane, a main body part is formed between the welding pins of each branch, and the pins of each branch are arranged in one-to-one correspondence; stamping and forming the metal circuit at one time to enable the main body parts of all the branches to be located on the same plane, sequentially arranging the pins of the first branch, the pins of the second branch and the pins of the third branch in sequence, and sequentially arranging the welding pins of the first branch and the second branch on the rectangular track and facing a rotating direction by taking the rectangular track as a center; the leg of the third branch is bent toward the leg of the second branch and is overlapped with a projection of the leg of the second branch in a first direction perpendicular to the welding plane, so that the leg of the third branch is located on the rectangular track and is located between the leg of the first branch and the leg of the second branch along the rotation direction.

Preferably, when the metal circuit is punched and formed once, the leg of the third branch is located outside the rectangular track and located between the main body part of the second branch and the main body part of the third branch, the leg is bent between the main body part of the third branch, and the main body part of the second branch and the main body part of the third branch form a branch vacancy.

Preferably, a joint is arranged between every two adjacent branches of the at least three branches, and the joint for connecting the main body parts of the adjacent branches is arranged on both sides of the bent position of the main body part of the third branch, which is adjacent to the solder tail.

Preferably, the branch circuit further includes a fourth branch circuit, the pins of the fourth branch circuit are arranged on the third branch circuit and deviated from one side of the pins of the second branch circuit, the solder feet of the fourth branch circuit are located on the rectangular track and are arranged on the second branch circuit and deviated from one side of the solder feet of the third branch circuit along the rotating direction, and two sides of the main body part bending position of the solder feet adjacent to the third branch circuit are respectively provided with a connecting part for connecting the main body parts of the second branch circuit and the fourth branch circuit.

Preferably, the solder tail of the fourth branch and the solder tail of the first branch are located on a first side edge of the rectangular track, and the solder tail of the second branch and the solder tail of the third branch are located on a second side edge of the rectangular track opposite to the first side edge; and the four branches are arranged in a straight line track at the pin position and sequentially comprise a first branch, a second branch, a third branch and a fourth branch from right to left, and the four branches are arranged at the welding foot position along a rectangular track and sequentially comprise the first branch, the third branch, the second branch and the fourth branch in an anticlockwise arrangement mode.

Preferably, a bending angle is formed between the fillet of the bent third branch and the main body of the third branch, and the bending angle is not less than 90 degrees and not more than 180 degrees.

Preferably, the main body portions of all the branches are located on the same plane and defined as a first plane, each of the solder tails includes a soldering portion, a transition portion and a connecting portion, the connecting portion connects the main body portions of the branches, the bending of the solder tail of the third branch occurs at the connecting portion, and projections of the connecting portion of the third branch and the connecting portion of the second branch in the first direction have overlapping portions.

Preferably, the welding parts of the solder tails are all provided with welding surfaces, all the welding surfaces of the solder tails connecting the same electronic element are positioned on the same plane and are defined as a second plane, and the second plane is not coplanar with the first plane.

Preferably, the transition portion of each of the solder fillets is bent from the first plane to the second plane.

Preferably, the included angle between the extending direction of the connecting part of the bent third branch and the extending direction of the connecting part of the second branch is 90 degrees.

Preferably, an included angle between the extending direction of the connecting portion of the bent third branch and the extending direction of the connecting portion of the second branch is an acute angle or an obtuse angle.

Preferably, the connecting portion of the bent third branch includes a bent portion connected to the main body portion and bent, and a straight extending portion extending straight along the bent portion and contacting the transition portion, and a gap exists between the straight extending portion and the main body portion.

Preferably, all the pins of the branch are located on the same plane and defined as a third plane, and the third plane is coplanar with the first plane.

Preferably, all the pins of the branch are arranged in a straight track.

Preferably, the solder tails connected to the same electronic component are arranged in a rectangular track.

Preferably, the number of the branches is four, wherein the solder tails of two branches are disposed on one side of the rectangular track, and the solder tails of the other two branches are disposed on the other side of the rectangular track.

Preferably, the metal circuit is formed by stamping a single-sided material belt.

The purpose of the invention is realized by the following technical scheme II: a voice coil motor comprising a base with a metal circuit as described above.

The purpose of the invention is realized by the following technical scheme three: a method of manufacturing a base having a metal circuit as described above, comprising the steps of:

the method comprises the following steps: the material belt is formed into a single-layer metal circuit in a stamping mode, the stamped metal circuit is provided with a plurality of branches, the branches are connected through the material belt, each branch comprises a welding leg, a pin which is located at the other end and connected with an external circuit and is arranged in a one-to-one correspondence mode with the welding leg, and a main body part which is connected with the welding leg and the pin, each welding leg comprises a welding part, a transition part and a connecting part, the connecting part is connected with the main body part of the branch, the main body parts of the branches are located on the same plane, and the pins of the branches are arranged in a linear track; the branch circuits at least comprise three branch circuits which are respectively a first branch circuit, a second branch circuit and a third branch circuit, the pins of the first branch circuit, the pins of the second branch circuit and the pins of the third branch circuit are sequentially arranged, the welding feet of the first branch circuit and the second branch circuit are positioned on a rectangular track and are sequentially arranged towards a rotating direction by taking the rectangular track as a center, the welding feet of the third branch circuit are positioned outside the rectangular track and the welding feet of the third branch circuit are positioned on one side of the main body part of the second branch circuit, which is far away from the main body part of the first branch circuit;

step two: bending the solder leg of the third branch towards the solder leg direction in the second branch and overlapping a projection part of the solder leg of the second branch in a first direction perpendicular to a welding plane, so that the solder leg of the third branch is located on the rectangular track and located between the solder leg of the first branch and the solder leg of the second branch along the rotation direction;

step three: molding a plastic material on the first semi-finished product to form a second semi-finished product integrally molded with a plastic body and a metal circuit;

step four: cutting the material belt on the second semi-finished product;

step five: and welding the electronic element on the plastic body corresponding to the welding feet through an SMT (surface mount technology) process to form a base integrally injection-molded with the plastic body and the metal circuit.

Preferably, wherein:

step two: bending the connecting part of one third branch at 180 degrees to enable the connecting part to be provided with a straight extending part basically superposed with the main body part; and stamping the part of the straight extending part of the connecting part, which is connected with the main body part, to form a bent part, so that a gap exists between the straight extending part and the main body part, and a first semi-finished product is formed.

The purpose of the invention is realized by the following technical scheme four: a method of manufacturing a voice coil motor comprising the steps of the method of manufacturing a base with a metal circuit as described above.

According to the branch of the metal circuit, the metal circuit branches are formed by adopting a traditional stamping mode, and the welding leg of one branch is bent, so that the bent welding leg is partially overlapped with the projection parts of the welding legs of other branches in the arrangement direction of the metal circuit, the arrangement direction of pins of at least three branches is different from that of the welding legs, and the finally bent welding leg and the welding legs of other branches are positioned on the same plane, so that the overlapping of spatial circuits is realized, the arrangement space of the metal circuit is expanded, the arrangement density of the metal circuit is increased, the arrangement mode of the metal circuit is optimized, and the diversified arrangement requirements of the metal circuit are met.

Drawings

Fig. 1 is a schematic view of a periscopic lens module according to the present invention.

Fig. 2 is a top view of a metal circuit substrate of the present invention.

FIG. 3 is a schematic diagram of a plastic body injection molded on a metal circuit substrate.

FIG. 4 is a schematic diagram of a metal circuit after cutting the peripheral branch of the plastic body shown in FIG. 3.

Fig. 5 is a partially enlarged view of fig. 4.

Fig. 6 is a view of fig. 2 viewed from another direction.

Fig. 7 is a cross-sectional view taken along line a-a of fig. 6.

Fig. 8 is a perspective view of a metal substrate.

Fig. 9 is a partially enlarged view of fig. 8.

Fig. 10 is a top view of the base.

Fig. 11 is an exploded perspective view of the base.

Fig. 12 is a top view of the plastic body and the electronic component being soldered.

Fig. 13 is a top view of the plastic body.

Fig. 14 is a cross-sectional view taken along line B-B of fig. 13.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or assembly must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that the term "connected" is to be interpreted broadly, unless otherwise explicitly specified or limited, and the specific meaning of the above terms in the present invention will be specifically understood by those skilled in the art.

Hereinafter, the base 100 and the voice coil motor according to the present invention will be described with reference to fig. 1 to 14. In the present invention, the base 100 and the voice coil motor are applied to a periscopic lens module in a mobile phone. Due to the limitation of the thickness of the mobile phone, the camera of the mobile phone which is vertically arranged conventionally (i.e. towards the outside on the surface of the mobile phone) has a small focal length and limited optical zooming capability, but in the invention, the camera is transversely arranged in the mobile phone, which is different from the vertical arrangement mode of the traditional lens, as shown in fig. 1. A periscopic camera module 1000 comprises a photosensitive assembly 1001, an optical lens 1002, a reflective element 1003, and a voice coil motor. The optical lens 1002 is located between the photosensitive component 1001 and the reflective element 1003, so that the ambient light is reflected by the reflective element 1003 to change the propagation direction of the ambient light (the light entering the mobile phone camera in the vertical direction is changed into the light in the lateral direction), and after passing through the optical lens 1002, the ambient light is received by the photosensitive component 1001 to acquire an image. The voice coil motor is used for driving the optical lens 1002 to move so as to change the moving position of the optical lens 1002. The voice coil motor at least comprises the base 100, a plurality of metal circuits 1 electrically connected with the base 100, a plurality of magnetic elements which are arranged opposite to the metal circuits 1 and can interact with each other, and a lens holder which is controlled by the metal circuits 1 and the magnetic elements to move. The metal circuit can interact with the magnetic element to move the lens holder after being powered on, so as to assist the optical lens 1002 to focus, which will be described in detail below.

Referring to fig. 1 to 14, the voice coil motor includes a base 100. The base 100 is provided with an electronic component 3, a metal circuit 1 welded with the electronic component 3, and a plastic body 2 integrally injection-molded with the metal circuit 1.

In the present invention, the base material of the metal circuit 1 is made of copper or stainless steel. The metal circuit 1 is formed by stamping a single-sided material belt. The metal circuit 1 comprises a plurality of branches 10, the plurality of branches 10 correspond to pins of the electronic component 3 one by one, so that the plurality of branches 10 and the electronic component 3 are welded in a Surface Mount Technology (SMT) mode to be connected into a whole, and the welding efficiency is improved.

The plastic body 2 is coated on the metal circuit 1, and one end of the branch 10 of the metal circuit 1, which is far away from the electronic component 3, extends out of the plastic body 2. The plastic body 2 can play a role in protecting the metal circuit 1, one end, far away from the electronic element 3, of the branch 10 of the metal circuit 1 is arranged on one side of the outside of the plastic body 2, and can be connected with an external circuit (PCB) through welding or other electric connection modes, so that the electronic element 3 passes through the branch 10 and is connected with the external circuit, and the external circuit passes through the branch 10 to control the electronic element 3, so that the electronic element and the magnetic element interact with each other to assist the focusing of the optical lens 1002. The shape and structure of the plastic body 2 can be adaptively adjusted according to specific use occasions, and the embodiment is not limited, and the plastic body 2 is rectangular in the embodiment. In the present embodiment, the plastic body 2 and the metal circuit 1 are integrally injection molded, so that it is not necessary to separately produce the metal circuit 1 and the plastic body 2, and then, it is not necessary to perform an assembly process. The integral injection Molding can be realized by Insert Molding (IM) or Molded Interconnect Device (MID) technology.

Each branch 10 of the metal circuit 1 includes a solder leg 10b soldered to the electronic component 3, pins 10a spaced apart from the electronic component 3 and arranged in parallel for connection to an external circuit, and a main body portion 10c connecting the solder leg 10b and the pins 10 a. The solder tails 10b correspond to the pins of the electronic component 3 one by one, and the two are mutually soldered by soldering methods such as SMT and the like to realize electrical connection.

The metal circuit 1 is formed by one-time stamping of a single-sided material belt, so that after stamping forming, all sections of structures (the welding foot 10b, the pin 10a and the main body part 10c) of each branch 10 are in the same plane. However, based on the requirement of soldering the solder tail 10b and the electronic component 3, in the preferred embodiment of the present invention, the main body portion 10c of all the branches 10 is located on the same plane and is defined as the first plane P1, and all the solder tails 10b of all the branches 10 soldered to the same electronic component 3 are located on the same plane and are defined as the second plane P2. The solder foot 10b located in the second plane P2 can perform independent soldering with the electronic component 3 independently of the other areas of the metal circuit 1. However, in other embodiments, the plane P1 on which the main body portion 10c is located and the plane P2 on which the fillet 10b is located may be located on the same plane. Each of the fillets 10b comprises a welding portion 10b1, a transition portion 10b2 and a connecting portion 10b3, the connecting portion 10b3 connects the main portion 10c of the branch 10, and the welding portion 10b1 of the fillet 10b is provided with a welding surface 10b 11. The welding surface 10b11 is located on the second plane P2. The transition portion 10b2 of each solder foot 10b is bent from the first plane P1 to the second plane P2. All the pins 10a of all the branches 10 are located on the same plane and define a third plane P3, the third plane P3 being coplanar with the first plane P1. In other embodiments, the plane P3 on which the lead 10a is located and the plane P1 on which the main body 10c is located may be located on different planes.

Further, the branches 10 at least include a first branch 11, a second branch 12, a third branch 13, a fourth branch 14, a fifth branch and a sixth branch, which are arranged in order. In other embodiments, the number of branches may be designed according to the required number of actual bonding pins, but in the technical solution of the present invention, the number of branches needs to be limited to be at least greater than 3. As shown in fig. 2 to 12, the first branch 11 includes a first solder leg 112 soldered to the electronic component 3, a first lead 111 extending out of one side of the plastic body 2, and a first main body 113 connecting the first solder leg 112 and the first lead 111. The first fillet 112 includes a first welding portion 1121 having the welding surface 10b11, a first connection portion 1123 connecting the first main body portion 113, and a first transition portion 1122 connecting the first welding portion 1121 and the first connection portion 1123. The first transition portion 1122 is bent from the first plane P1 to the second plane P2. The second branch 12 includes a second solder leg 122 soldered to the electronic component 3, a second lead 121 extending out of one side of the plastic body 2, and a second main body 123 connecting the second solder leg 122 and the second lead 121. The second fillet 122 includes a second welding portion 1221 having the welding surface 10b11, a second connecting portion 1223 connecting the second body portion 123, and a second transition portion 1222 connecting the second welding portion 1221 and the second connecting portion 1223. The second transition portion 1222 is bent from the first plane P1 to the second plane P2. The third branch 13 includes a third solder leg 132 soldered to the electronic component 3, a third lead 131 extending out of one side of the plastic body 2, and a third main body 133 connecting the third solder leg 132 and the third lead 131. The third fillet 132 includes a third welding portion 1321 having the welding surface 10b11, a third connecting portion 1323 connecting the third body portion 133, and a third transition portion 1322 connecting the third welding portion 1321 and the third connecting portion 1323. The third transition portion 1322 is bent from the first plane P1 to the second plane P2. The fourth branch 14 includes a fourth solder leg 142 soldered to the electronic component 3, a fourth lead 141 extending out of one side of the plastic body 2, and a fourth main portion 143 connecting the fourth solder leg 142 and the fourth lead 141. The fourth fillet 142 includes a fourth welding part 1421 having the welding surface 10b11, a fourth connecting part 1423 connecting the fourth main body 143, and a fourth transition part 1422 connecting the fourth welding part 1421 and the fourth connecting part 1423. The fourth transition part 1422 is bent from the first plane P1 to the second plane P2.

The fifth branch and the sixth branch also have a solder foot and a pin, and the solder foot of the fifth branch and the sixth branch contacts with another electronic component, which is not limited in this embodiment.

The first pin 111, the second pin 121, the third pin 131 and the fourth pin 141 are collectively referred to as a pin 10a, the first solder foot 112, the second solder foot 122, the third solder foot 132 and the fourth solder foot 142 are collectively referred to as a solder foot 10b and are all provided with the uniformly facing soldering surfaces 10b11, and the soldering surfaces 10b11 are all located on the same plane (i.e., the second plane P2) so as to facilitate subsequent soldering with the electronic component 3. The first body portion 113, the second body portion 123, the third body portion 133, and the fourth body portion 143 are collectively referred to as a body portion 10c and all lie on the same plane (i.e., the first plane P1). The first, second, third and fourth welds 1121, 1221, 1321 and 1421 are collectively referred to as a weld 10b 1. The first transition 1122, the second transition 1222, the third transition 1322, and the fourth transition 1422 are collectively referred to as a transition 10b 2. The first connection portion 1123, the second connection portion 1223, the third connection portion 1323, and the fourth connection portion 1423 are collectively referred to as the connection portion 10b 3.

The first pin 111, the second pin 121, the third pin 131 and the fourth pin 141 are located at one end of the branch 10, which is far away from the electronic component 3, and behind the plastic body 2, located on the same side surface of the outside of the plastic body 2, and are sequentially arranged at intervals from right to left, and are arranged in a linear track. The pin of the fifth branch and the pin of the sixth branch are also located at one side of the fourth pin 141 and are arranged in order with the other three pins (111/121/131). Based on the sequential and orderly arrangement of the first pin 111, the second pin 121, the third pin 131 and the fourth pin 141 at intervals, the third solder leg 132 needs to be defined by inserting the first solder leg 112 corresponding to the first pin 111 and the second solder leg 122 corresponding to the second pin 121 between the sequences, but the third pin 131 corresponding to the third solder leg 132 is sequenced outside the first pin 111 and the second pin 121, so that the third branch 13 needs to be crossed with the second branch 12 in space in order to simultaneously realize the sequencing placement of the pins 10a and the solder legs 10b in the same plane. That is, when the arrangement order of the leads 10a is the first lead 111, the second lead 121 and the third lead 131, and the arrangement order of the solder tails 10b is the first solder tail 112, the third solder tail 132 and the second solder tail 122 or the second solder tail 122, the first solder tail 112 and the third solder tail 132. In other embodiments, the number of branches 10 may be set to be greater, and is not limited herein.

In the prior art, a form of crossing branch conductive paths has been implemented, that is, a flexible circuit board is used or a segmented circuit is used and then an additional processing procedure (such as welding) is performed to electrically connect the segmented short circuit. However, the flexible circuit board has high cost and the processing procedure of the flexible circuit board is relatively complex; the secondary treatment of the segmented circuit also increases the processing cost, and the stability of the treated two segments of circuits is not good. Therefore, there are both problems of cost and performance in any conventional method for performing spatial position crossing processing.

In the embodiment of the present invention, the metal circuit 1 is provided with a folding region, at least one of the branches 10 is bent at the folding region to realize a spatial crossing of another branch 10, so as to realize a crossing of two branches 10, and a transition of a planar position of the solder tail 10b of the two branches 10. In other embodiments, the plurality of branches 10 may be bent to intersect with other branches 10. The folding area may be located at any place of the two branches 10 of the metal circuit 1 except the pin 10a where they need to meet or partially overlap. In this embodiment, the folding region is disposed near the electronic component 3, i.e., near the solder leg 10b of the branch 10, and this arrangement is because the metal circuit is formed by one-step stamping and is bent near the solder leg 10b, which results in a large operation space and is more convenient for secondary stamping. In the present embodiment, the third fillet 132 of the third branch 13 is bent to overlap with a projection of the second fillet 122 in the vertical direction. Since the arrangement direction of the metal circuit 1 is in the vertical direction in the present embodiment, the projected portion of the generated fillet is in the vertical direction. In another embodiment, if the metal circuit 1 is disposed in the front-rear direction in the horizontal direction, the projected portion of the generated fillet is in the front-rear direction in the horizontal direction; if the metal circuit 1 is disposed in the horizontal left-right direction, the projected portion of the generated fillet is in the horizontal left-right direction. Of course, the metal circuit may be arranged stereoscopically, that is, the metal circuit 1 may be provided with a part of the solder leg in both the vertical direction and the horizontal direction, and the part of the solder leg projection generated is in the vertical direction and the horizontal direction.

Specifically, in the present invention, bending occurs on the third connection portion 1323 of the third fillet 132, and at this time, the third connection portion 1323 overlaps with the projection of the second connection portion 1223 in the vertical direction. The third connecting portion 1323 includes a bent portion 13231 connecting the third main body portion 133 and a straight extending portion 13232 connecting the bent portion 13231 and the third transition portion 1322. Due to the bending portion 13231, a gap exists between the straight extending portion 13232 and the main body portion 133 to accommodate an external shim. The gap can accommodate the plastic body with the minimum thickness within the allowable range during injection molding, and further support the overall strength. And the gap can be inserted with a cushion cutter during bending, thereby preventing the welding leg 10b from being broken.

The straight extending portion 13232 overlaps with a projection of the second connection portion 1223 in the vertical direction. At this time, the third transition portion 1322 extends from the plane of the straight extension 13232 to the welding surface 10b 11. Meanwhile, a bending angle is formed between the third solder leg 132 and the third main body 133, and the bending angle is not less than 90 degrees and not more than 180 degrees. If the bending angle is smaller than 90 degrees, there will be no overlapping area of the projection parts between the third solder leg 132 and the second solder leg 122 in the vertical direction, and the third solder leg 132 and the second solder leg 122 can not be soldered to the same electronic component 3, and the space crossing can be realized. In the present embodiment, the bending angle is 180 degrees. Specifically, the bending angle between the straight extending portion 13232 of the third connecting portion 1323 of the third fillet 132 and the third main body portion 133 is 180 degrees. Meanwhile, the included angle between the third connecting portion 1323 and the extending direction of the second connecting portion 1223 is 90 degrees. In other embodiments, the included angle between the connection portion 1323 and the other connection portion 1223, which are bent, in the extending direction may be an acute angle or an obtuse angle, and both the fillet 132 of the bent connection portion 1323 and the fillet 122 having the other connection portion 1223 may realize the crossing of the space circuit, and are located on the same soldering plane of the electronic component 3.

In the present embodiment, the solder tails 10b connected to the same electronic component 3 are arranged in a rectangular track. The number of the branches (10) is four, wherein a first branch (11) and a fourth branch (14) are arranged on one side of the rectangular frame, and the other two second branches (12) and the third branch (13) are arranged on the other side of the rectangular frame. The first pin 111, the second pin 121, the third pin 131 and the fourth pin 141 are sequentially arranged from right to left. In the area where the electronic component 3 contacts the solder tail 10a, the arrangement direction of the first solder tail 112 and the second solder tail 122 is opposite to the arrangement direction of the first lead 111 and the second lead 121. The arrangement direction of the third solder leg 132 and the fourth solder leg 142 is opposite to the arrangement direction of the third lead 131 and the fourth lead 141. The arrangement direction of the first solder feet 112 and the fourth solder feet 142 is opposite to the arrangement direction of the first pins 111 and the fourth pins 141. At this time, the third connection portion 1323 of the third branch 13 is bent so that the arrangement order of the first, second, third and fourth fillets 112, 122, 132 and 142 is different from the arrangement order of the first, second, third and fourth pins 111, 121, 131 and 141, thereby implementing the overlapping of the space circuit, increasing the distribution density of the circuit board pads, and allowing more pads to be distributed in the limited layout space.

In the present invention, the metal circuit 1 is formed by a single material tape through one-step stamping, but since the branches 10 are metal circuits with smaller sizes, in order to ensure that each branch 10 is not easily deformed during the subsequent bending or welding process of stamping each branch 10, and to ensure the dimensional accuracy of the branches 10, a plurality of connecting portions 10d are required to be properly arranged between the branches 10. In the present embodiment, a connection portion 10d is disposed between at least two adjacent branches 10, and the plastic body 2 is provided with a cutting hole 22 corresponding to the connection portion 10d for inserting an external punching jig. The diameter of the cutout hole 22 is larger than the transverse dimension of the joint 10 d. The joint 10d of each branch 10 is disposed close to the solder tail 10b, because the transverse dimension of the solder tail 10b is smaller and is further away from the outer tape and disposed at the middle position of the metal circuit 1, the joint 10d is disposed closer to the solder tail 10 b. The plastic body 2 is further provided with a bearing groove 23 located above the cutting hole 22, and the bearing groove 23 is communicated with the cutting hole 22 in the vertical direction. The diameter of the bearing groove 23 is larger than that of the cutting hole 22. The bearing groove 23 and the cutting hole 22 are located on the upper side and the lower side of the joint 10d in the vertical direction, and the bearing groove 23 is closer to the joint 10d so as to allow an external jig to be inserted and abut against the joint 10 d. As shown in fig. 14, the cross section of the bearing groove 23 is a trapezoid structure, the upper part is wide, the lower part is small, the upper surface of the joint 10d is exposed in the bearing groove 23, when the external thimble breaks the joint 10d from bottom to top, the external jig is inserted into the bearing groove 23 downward and abuts against the surface of the joint 10d to serve as a support for breaking the joint 10d, and after breaking, the external jig is pulled out from top, which is helpful for demolding. Because the connection 10d between the broken branches 10 is broken by the external jig disposed in the carrying groove 23, the connection 10d is abutted by the external jig, so that the metal circuit 1 is prevented from deforming due to the abutment of the external jig, and finally, the connection 10d is broken by the external breaking jig, so that each branch 1011 has an independent loop. In this embodiment, the cross section of the bearing groove 23 is an isosceles trapezoid, and the shape of the bearing groove is a truncated cone, in other embodiments, the cross section of the bearing groove 23 may also be a right trapezoid, an irregular trapezoid, or the like, and the shape of the bearing groove may also be a truncated pyramid.

The present embodiment also relates to a voice coil motor including the base 100 having the metal circuit 1. Because the production process of the base with the metal circuit is simplified and the possibility of increasing the layout density of the base with the metal circuit is increased, the size design of the voice coil motor can be smaller, and the cost is reduced, the assembly process of the voice coil motor is facilitated to be simplified, and the production efficiency of the voice coil motor is improved.

The embodiment also relates to a manufacturing method for manufacturing the base with the metal circuit, which specifically comprises the following steps:

firstly, a single-sided material belt is formed into a single-layer metal circuit 1 through stamping, the stamped metal circuit is provided with a plurality of branches 10, the branches 10 are connected through the material belt, connecting parts 10d are arranged between adjacent branches 10d, each branch 10 comprises a welding foot 10b, a pin 10a which is positioned at the other end and connected with an external circuit, and a main body part 10c which is connected with the welding foot 10b and the pin 10a, each welding foot 10b comprises a welding part 10b1, a transition part 10b2 and a connecting part 10b3, and the connecting part 10b3 is connected with the main body part 10c of the branch 10;

a second step of bending a third connecting portion 1323 of one third branch 13, so that the third connecting portion 1323 has a straight extending portion 13232 substantially coinciding with the third main body portion 133 and the solder leg 132 and the solder leg 10b of the other branch are located on the same plane; in this embodiment, the bending is made 180 degrees, but in other embodiments, the bending may be any other angle capable of performing spatial crossing, which is not less than 90 degrees and not more than 180 degrees, so that the spatial overlapping crossing of the branches can be realized.

A third step of punching a portion of the straight extended portion 13232 of the third connecting portion 1323, which is connected to the main body portion 133, to form a bent portion 13231 such that a gap exists between the straight extended portion 13232 and the third main body portion 133 to form a first semi-finished product;

fourthly, plastic materials are injected and molded on the first semi-finished product to form a second semi-finished product which is integrally injected and molded with the plastic body 2 and the metal circuit 1;

fifthly, cutting the material belt on the peripheral side of the second semi-finished product and punching off the connecting part 10d of the branch 10, firstly jacking an external jig into the bearing groove 23 arranged in the circular truncated cone shape, and after punching off the connecting part 10d, pulling out the jig from the bearing groove 23 in the circular truncated cone shape with large external diameter and small internal diameter, so as to be beneficial to demoulding of the product;

sixthly, the electronic component 3 is welded to the plastic body 2 corresponding to the solder leg 10b by the SMT process to form the base 100 integrally molded with the plastic body 2 and the metal circuit 1.

The invention also relates to a manufacturing method of the voice coil motor, which simplifies the production process of the base with the metal circuit and increases the possibility of increasing the layout density of the base with the metal circuit, so that the size design of the voice coil motor can be smaller, the cost is reduced, the assembly process of the voice coil motor is facilitated to be simplified, and the production efficiency of the voice coil motor is improved.

In the invention, the third solder leg 132 of the third branch 13 is bent, so that the projections of the third solder leg 132 and the second solder leg 122 of the second branch in the placing direction (vertical or horizontal) of the metal circuit 1 are partially overlapped, and the third solder leg 132 and the second solder leg 122 are welded with the same electronic element 3 and are positioned on the same plane, thereby realizing the function of avoiding circuits smoothly, preventing the short circuit of the internal circuit of a product caused by the lap joint of the metal circuits 1, and solving the problem that the single-layer metal circuits cannot be staggered mutually. Meanwhile, the spatially staggered manner of the branches 10 may be beneficial to increase the distribution density of the circuit board pads, thereby allowing more pads to be distributed in a limited layout space. All the bent welding feet 10b have uniform welding surfaces, and are convenient to be welded with electronic components in an SMT mode.

In addition, since the plastic body 2 is provided with the truncated cone-shaped bearing groove 23 corresponding to the connection portion 10d of the different branches 10, that is, the outer diameter of the outer portion of the bearing groove 23 is larger than the outer diameter of the inner portion close to the metal circuit 1, in other words, when the external jig is inserted into the bearing groove 23, the external jig firstly passes through one end of the bearing groove 23 with the larger outer diameter, and then is inserted into the other end of the bearing groove 23 with the smaller outer diameter close to the metal circuit 1, and after the connection portion 10d is broken, the outer diameter of the outer portion of the bearing groove 23 is large, so that the external jig is easy to be pulled out.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

The above description is only a part of the embodiments of the present invention, and not all embodiments, and any equivalent variations of the technical solutions of the present invention, which are made by those skilled in the art through reading the present specification, are covered by the claims of the present invention.

Claims (18)

1. A submount with metal circuitry comprising: electronic component, with the metal circuit that electronic component welded punching press formed, with the plastic body of the integrative injection moulding of metal circuit, its characterized in that: the metal circuit at least comprises three branches which are respectively a first branch, a second branch and a third branch, one ends of the branches are arranged in parallel at intervals to form pins, the pins of the three branches are positioned on the same side of the plastic body and are arranged in a linear track, the other ends of the three branches are arranged one by one corresponding to the pins of the electronic component to form welding pins, the welding pins of the three branches are connected to the same electronic component and are arranged in a rectangular track, the plane where the welding pins are positioned is defined as a welding plane, a main body part is formed between the welding pins and the welding pins of each branch, and the pins and the welding pins of each branch are arranged in one-to-one correspondence; stamping and forming the metal circuit at one time to enable the main body parts of all the branches to be located on the same plane, sequentially arranging the pins of the first branch, the pins of the second branch and the pins of the third branch in sequence, and sequentially arranging the welding pins of the first branch and the second branch on the rectangular track and facing a rotating direction by taking the rectangular track as a center; the leg of the third branch is bent toward the leg of the second branch and is overlapped with a projection part of the leg of the second branch in a first direction perpendicular to the welding plane, so that the leg of the third branch is located on the rectangular track and is located between the leg of the first branch and the leg of the second branch along the rotating direction.

2. The metal circuit-bearing pad of claim 1, wherein: when the metal circuit is formed by one-time stamping, the welding leg of the third branch is positioned outside the rectangular track and positioned on the second branch between the main body part and the third branch, the third branch is bent between the main body part and the welding leg, and the main body part of the second branch and the main body part of the third branch form a branch vacancy.

3. The metal circuit-bearing pad of claim 1, wherein: and a joint is arranged between every two adjacent branches of the at least three branches, and the joint for connecting the main body parts of the adjacent branches is arranged on both sides of the main body part bending position of the third branch adjacent to the welding leg.

4. A base with metal circuitry as in claim 3, wherein: the branch circuit further comprises a fourth branch circuit, the pins of the fourth branch circuit are arranged on the third branch circuit, the pins deviate from the second branch circuit, one side of the pins is arranged on the fourth branch circuit, the welding feet are located on the rectangular track and are arranged on the second branch circuit in the rotating direction, the welding feet deviate from the third branch circuit, one side of the welding feet is arranged on the third branch circuit, the position of the third branch circuit is adjacent to the welding feet, and the two sides of the bending position of the main body portion are respectively provided with a connection part for connecting the main body portions of the second branch circuit and the fourth branch circuit.

5. The metal circuit-bearing pad of claim 4 wherein: the welding foot of the fourth branch and the welding foot of the first branch are positioned on a first side edge of the rectangular track, and the welding foot of the second branch and the welding foot of the third branch are positioned on a second side edge of the rectangular track, which is opposite to the first side edge; and four the branch road is in pin department is the straight line orbit and arranges and from right side to left's mode of arranging and be first branch road, second branch road, third branch road, fourth branch road in proper order, and four branch roads are in leg department is arranged and anticlockwise mode of arranging along the rectangle orbit is first branch road, third branch road, second branch road, fourth branch road in proper order.

6. The metal circuit-bearing pad of claim 1, wherein: a bending angle is arranged between the welding leg of the bent third branch circuit and the main body part of the third branch circuit, and the bending angle is not less than 90 degrees and not more than 180 degrees.

7. The metal circuit-bearing pad of claim 1, wherein: all the branch circuits are located on the same plane and defined as a first plane, each welding leg comprises a welding part, a transition part and a connecting part, the connecting part is connected with the main part of the branch circuit, the bending of the welding leg of the third branch circuit occurs on the connecting part, and the projections of the connecting part of the second branch circuit in the first direction have overlapped parts.

8. The metal circuit-bearing pad of claim 7, wherein: the welding parts of the welding feet are provided with welding surfaces, all the welding surfaces of the welding feet which are connected with the same electronic element are positioned on the same plane and defined as a second plane, and the second plane is not coplanar with the first plane.

9. The metal circuit-bearing pad of claim 8, wherein: the transition part of each welding leg is bent from the first plane to the second plane.

10. The metal circuit-bearing pad of claim 7, wherein: the included angle between the connection part of the third branch and the extension direction of the connection part of the second branch is 90 degrees.

11. The metal circuit-bearing pad of claim 7, wherein: the included angle between the connection part of the bent third branch and the extension direction of the connection part of the second branch is an acute angle or an obtuse angle.

12. The metal circuit-bearing pad of claim 7, wherein: the connecting part of the bent third branch comprises a bent part which is connected with the main body part and is bent and a straight extending part which extends straight along the bent part and is in contact with the transition part, and a gap is formed between the straight extending part and the main body part.

13. The metal circuit-bearing pad of claim 8, wherein: all the pins of the branch are positioned on the same plane and defined as a third plane, and the third plane is coplanar with the first plane.

14. The metal circuit-bearing pad of claim 1, wherein: the metal circuit is formed by single-sided material belt punch forming.

15. A voice coil motor, comprising: comprising a base with a metal circuit according to any of claims 1-14.

16. A method of manufacturing a base with a metal circuit according to any one of claims 1 to 14, comprising the steps of:

the method comprises the following steps: the material belt is formed into a single-layer metal circuit in a stamping mode, the stamped metal circuit is provided with a plurality of branches, the branches are connected through the material belt, each branch comprises a welding leg, a pin which is located at the other end and connected with an external circuit and is arranged in a one-to-one correspondence mode with the welding leg, and a main body part which is connected with the welding leg and the pin, each welding leg comprises a welding part, a transition part and a connecting part, the connecting part is connected with the main body part of the branch, the main body parts of the branches are located on the same plane, and the pins of the branches are arranged in a linear track; the branch circuits at least comprise three branch circuits which are respectively a first branch circuit, a second branch circuit and a third branch circuit, the pins of the first branch circuit, the pins of the second branch circuit and the pins of the third branch circuit are sequentially arranged, the welding feet of the first branch circuit and the second branch circuit are positioned on a rectangular track and are sequentially arranged towards a rotating direction by taking the rectangular track as a center, the welding feet of the third branch circuit are positioned outside the rectangular track and the welding feet of the third branch circuit are positioned on one side of the main body part of the second branch circuit, which is far away from the main body part of the first branch circuit;

step two: bending the solder leg of the third branch towards the solder leg direction in the second branch and overlapping a projection part of the solder leg of the second branch in a first direction perpendicular to a welding plane, so that the solder leg of the third branch is located on the rectangular track and located between the solder leg of the first branch and the solder leg of the second branch along the rotation direction;

step three: molding a plastic material on the first semi-finished product to form a second semi-finished product integrally molded with a plastic body and a metal circuit;

step four: cutting the material belt on the second semi-finished product;

step five: and welding the electronic element on the plastic body corresponding to the welding feet through an SMT (surface mount technology) process to form a base integrally injection-molded with the plastic body and the metal circuit.

17. The method of manufacturing a submount with a metal circuit of claim 16 wherein:

step two: bending the connecting part of one third branch at 180 degrees to enable the connecting part to be provided with a straight extending part basically superposed with the main body part; and stamping the part of the straight extending part of the connecting part, which is connected with the main body part, to form a bent part, so that a gap exists between the straight extending part and the main body part, and a first semi-finished product is formed.

18. A manufacturing method of a voice coil motor is characterized in that: comprising the steps of a method of manufacturing a base with a metal circuit as claimed in claim 16 or 17.

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