JP2017174892A - Usb device and manufacturing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a USB device having more stable connection between a connection terminal and a connection pad on a circuit board, and a manufacturing method for the same.SOLUTION: A USB device includes: a wiring board 21 having a first surface 21a and a second surface 21b positioned on a side opposite to the first surface and having a connection pad 212, and a circuit board 2 including semiconductor components 22 and 23 mounted on the first surface; a terminal portion 3 disposed on the second surface and including an insulating member 32 having a connection terminal 31 with a connection part to be electrically connected to the connection pad 212 and a wall part 32a disposed outside the circuit board and protruding in the thickness direction of the circuit board; and a solder 4 positioned between the connection pad and the connection part. The wall part is in contact with the circuit board and the connection pad has a first end on the connection terminal side and a second end opposite to the first end, both ends being opposite to each other in the extension direction of the connection terminal. The shortest distance between the first end and the border between the connection part and the solder is less than or equal to the shortest distance between the second end and the border between the connection part and the solder.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a USB device and a manufacturing method thereof.

One of the connection standards for connecting information devices such as computers and peripheral devices is USB (
Universal Serial Bus (USB) is known. USB3.0, one of the USB standards, maintains 10% of USB2.0 while maintaining compatibility with USB2.0.
It is possible to perform high-speed transfer having a transfer speed more than double. The USB 3.0 USB connector requires five connection terminals in addition to the four connection terminals provided on the USB 2.0 USB connector. These connection terminals are connected to the circuit board while being fixed to the insulating member.

JP 2014-107301 A

The problem to be solved by the present embodiment is to provide a USB device and a method for manufacturing the same, in which the connection between the connection pad on the circuit board and the connection terminal is further stabilized.

The USB device of the embodiment is a US that can transfer data by connecting to a receptacle.
B device comprising: a wiring board including a first surface and a second surface located on the opposite side of the first surface and having connection pads; and a semiconductor component mounted on the first surface. An insulating member having a circuit board, a connection terminal having a connection portion electrically connected to the connection pad, and a wall portion outside the circuit board and projecting along the thickness direction of the circuit board; A terminal portion placed on the second surface, and a solder positioned between the connection pad and the connection portion, the wall portion is in contact with the circuit board, and the connection pad is A first end on the connection terminal side and a second end opposite to the first end facing each other in the extending direction of the connection terminal, the boundary between the connection site and the solder, and the first The shortest distance to the end is the boundary between the connection site and the solder and the second end. Characterized in that it is a shorter or equal than the minimum distance.

1 is a cross-sectional view showing a USB device according to a first embodiment. The top view which shows the USB apparatus which concerns on 1st Embodiment. Sectional drawing which shows the manufacturing process of the USB apparatus which concerns on 1st Embodiment. Sectional drawing which shows the manufacturing process of the USB apparatus which concerns on 1st Embodiment. 1 is a cross-sectional view showing a USB device according to a first embodiment. The top view which shows the USB apparatus which concerns on 2nd Embodiment. Sectional drawing which shows the modification of the USB apparatus which concerns on 2nd Embodiment.

  Hereinafter, embodiments for carrying out the invention will be described.

(First embodiment)
A first embodiment will be described with reference to FIGS. 1 to 4. The drawings are schematic, and for example, the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like may be different from the actual ones. In the embodiments, substantially the same constituent elements are denoted by the same reference numerals and description thereof is omitted.

1 to 4 are diagrams showing a USB device capable of transferring data by USB 3.0 by connecting to a receptacle. If the standard uses similar signals, other USB
It may be used as a USB device capable of data transfer according to the standard.

FIG. 1 is a schematic side view of a USB device 10 according to the present embodiment. 2 shows the housing 1 shown in FIG.
It is the plane schematic diagram seen from the USB device 10 upper surface except a part of. In FIG. 1 and FIG. 2, a circuit board 2 that is SiP (System in a Package: SiP) as an example.
A USB device comprising: In addition, with respect to the X-axis direction of FIG.
“Front”, the case 1 side is “rear”, and the same applies to the following.

A USB device 10 shown in FIGS. 1 and 2 includes a housing 1, a circuit board 2, and a terminal unit 3. The housing 1 includes an opening 11 that is a non-through hole. The housing 1 may be formed of an insulating material such as a synthetic resin such as polyvinyl chloride, or may be formed of a conductive metal. Moreover, you may form the housing | casing 1 which has the opening part 11 by bonding together a pair of housing | casing member which has a groove part shape | molded using the synthetic resin so that a groove part may face. The shape of the housing 1 is not limited to the shape shown in FIG. For example, the housing 1 may be provided so as to overlap all the circuit boards 2. Further, a housing having a function as a shell that protects a portion of the circuit board 2 that protrudes from the housing 1 may be provided separately from the housing 1.

The circuit board 2 is provided, for example, in the opening 11. The circuit board 2 can be fixed by the housing 1. The circuit board 2 is mounted on the wiring board 21 having the first surface 21a and the second surface 21b opposite to the first surface 21a, and the first surface 21a of the wiring board 21. In addition, a semiconductor component such as the memory chip 22 and the controller chip 23 and a resin layer 24 for sealing the semiconductor component are provided. X of the circuit board 2 substantially perpendicular to the first surface 21a and the second surface 21b
Of the two side surfaces facing each other in the axial direction, the front side surface is defined as a third surface 2a. Note that the present invention is not limited to the memory chip 22 and the controller chip 23, and other semiconductor components may be used. Further, the positions of the memory chip 22 and the controller chip 23 may be reversed.

The structure of the circuit board 2 is not limited to SiP. For example, PCBA (Printed C
It may be a circuit board or the like having an ircuit board assembly (PCBA).

The first surface 21a of the wiring substrate 21 corresponds to the lower surface of the wiring substrate 21 in FIG. 1, and the second surface 21b corresponds to the upper surface of the wiring substrate 21 in FIG. The wiring board 21 has the first surface 2
A plurality of connection pads including at least a connection pad 211 provided on 1a and the second surface 21;
a plurality of connection pads including at least a connection pad 212 provided in b. The connection pads on the first surface 21a are electrically connected to the connection pads 212 on the second surface 21b via vias that penetrate the wiring substrate 21, for example. As the wiring board 21, for example, a resin board such as glass epoxy having a wiring layer provided with connection pads provided on the surface can be used.

The connection pad 211 is a connection pad for electrically connecting the semiconductor component and the wiring board 21. The connection pad 212 is a connection pad for electrically connecting the terminal portion 3 and the wiring board 21. The connection pad 211 and the connection pad 212 are rectangular, for example.

The memory chip 22 is electrically connected to the connection pad 211. The memory chip 22
For example, it has a laminated body of a plurality of semiconductor chips, and the plurality of semiconductor chips are bonded to each other so that part of them overlaps with an adhesive layer in between. The plurality of semiconductor chips are electrically connected to each other by connecting electrode pads provided on each semiconductor chip by wire bonding or the like. As the semiconductor chip, for example, a memory chip having a storage element such as a NAND flash memory can be used. At this time, the semiconductor chip may include a decoder or the like in addition to the memory cell.

The controller chip 23 is electrically connected to connection pads on the first surface 21 a of the wiring board 21. The controller chip 23 is composed of a semiconductor chip, and the memory chip 2
2 controls operations such as data writing to 2 and data reading. The memory chip 22 and the controller chip 23 are electrically connected to the wiring board 21 by connecting electrode pads provided on the semiconductor chip and connection pads provided on the wiring board 21 by wire bonding or the like, for example.

The method for connecting the memory chip 22 and controller chip 23 to the wiring board 21 is not limited to wire bonding, and wireless bonding such as flip chip bonding or tape automated bonding may be used. Further, the TSV (Th, in which the memory chip 22 and the controller chip 23 are stacked on the first surface 21 a of the wiring substrate 21.
A three-dimensional mounting structure such as a rough silicon via (TSV) method may be used.

The resin layer 24 is provided so as to seal the memory chip 22 and the controller chip 23. The resin layer 24 contains, for example, an inorganic filler (for example, SiO 2). For example, the resin layer 24 is formed by a molding method such as a transfer molding method, a compression molding method, or an injection molding method using a sealing resin obtained by mixing the inorganic filler with an organic resin or the like.

  Next, the structure of the terminal portion 3 will be described.

As shown in FIGS. 1 and 2, the terminal portion 3 is provided on the circuit board 2 and is electrically connected to the circuit board 2. The terminal unit 3 is held by, for example, the housing 1.

The terminal portion 3 includes a first terminal 31, a second terminal 33, and an insulating member 32. In addition,
In FIG. 2, five first terminals 31 and four second terminals 33 are illustrated.
The numbers of the first and second terminals 33 are not particularly limited. Moreover, the shape of the 1st terminal 31 and the 2nd terminal 33 is not limited to this.

The first terminal 31 and the second terminal 33 have a function as a connection terminal that can be connected to a receptacle, for example. The connection terminals include, for example, a ground terminal (GND), signal terminals (SSTX +, SSTX−) for transmission data signals for high-speed transfer that are differential signals, and reception data signals for high-speed transfer that are differential signals. Signal terminals (SSRX +, SSRX-), etc.
Examples include connection terminals used for high-speed transfer according to SB2.0 or 3.0.

The first terminal 31 has, for example, a receptacle connection part 31a that is located at one end and projects toward the second terminal 33, and a tail part 31b that projects from the circuit board 2 at the other end and is connected to the receptacle. An intermediate portion between the portion 31 a and the tail portion 31 b is covered with the insulating member 32.

The tail portion 31b is exposed from the insulating member 32 to the rear circuit board 2 side and has a shape in which a width direction orthogonal to the longitudinal direction of the first terminal 31 is widened, and at least one of a plurality of connection pads (
Here, it is electrically connected to the connection pad 212). The tail part 31 b functions as a connection part of the first terminal 31 with the connection pad 212. The tail portion 31b is joined to the connection pad 212 via the solder 4 by soldering or the like, for example, but the joining method is not limited to this.

The second terminal 33 is connected to a connection pad on the second surface 21b of the wiring substrate 21, for example. However, the connection pad may be the connection pad 212, or a connection pad different from the connection pad 212 may be provided below the terminal portion 3.

For the first terminal 31 and the second terminal 33, for example, a material capable of imparting spring properties such as a copper alloy (for example, beryllium copper, phosphor bronze, cobalt copper) or a nickel alloy (for example, beryllium nickel) is used. it can. The material of the first terminal 31 and the second terminal 33 may be the same or different.

The first terminal 31 and the second terminal 33 are fixed to the insulating member 32. Thus, the insulating member 32
Depending on the position, it is possible to align the first terminal 31 and the second terminal 33 with the connection pad.

The insulating member 32 is mounted on the second surface 21 b of the circuit board 2. The insulating member 32 has a wall portion 32a that protrudes toward the first surface 21a (downward) with respect to the Z-axis direction. That is, the wall 32 a protrudes along the thickness direction of the circuit board 2. The wall portion 32 a has a fourth surface 32 b that faces the third surface 2 a of the circuit board 2. In the present embodiment, the fourth surface 32b of the insulating member 32 and the third surface 2a of the circuit board 2 are in contact with each other.

For example, when there is a gap between the third surface 2a and the fourth surface 32b, when the USB device 10 is inserted into the receptacle, the wall portion 32a collides with the receptacle and is pressed, so that the insulating member 32 is Due to the deformation and damage such as a crack in the connection portion between the first terminal 31 and the connection pad 212, the position of the first terminal 31 and the connection pad 212 may be shifted, resulting in poor connection. In the present embodiment, since the fourth surface 32b of the insulating member 32 and the third surface 2a of the circuit board 2 are in contact with each other, these fears are reduced.

  As the insulating member 32, for example, a resin or the like can be used.

  In addition, the structure of the terminal part 3 is not limited to the structure shown in FIG.1 and FIG.2.

  Next, a method for manufacturing the USB device 10 according to the present embodiment will be described.

3 and 4 are schematic side views for explaining an example of the manufacturing method of the USB device 10 of the present embodiment. As shown in FIG. 3A, a circuit board 2 on which a semiconductor component is mounted and which has a plurality of connection pads including connection pads 212 is prepared.

Next, as shown in FIG. 3B, for example, solder 4 is applied on the connection pads 212. The solder 4 is applied to, for example, the central portion of the connection pad.

Next, as shown in FIG. 4A, the terminal portion 3 is mounted on the circuit board 2. At this time, the terminal portion 3 is placed on the circuit board 2 so that the tail portion 31 b is biased toward the front side of the connection pad 212 and at least a part of the tail portion 31 b is in contact with the solder 4. At this time, there is a gap between the third surface 2a and the fourth surface 32b.

Next, as shown in FIG. 4B, the solder 4 is melted by a reflow process, and the tail portion 31b and the connection pad 212 are fixed by cooling. At this time, the solder 4 pulls the tail part 31b toward the solder 4 side by surface tension. Therefore, the tail portion 31b placed in front of the solder 4 is drawn rearward, and accordingly, the entire terminal portion 3 also moves rearward. That is, the tail portion 31b moves from a position in front of the connection pad 212 to, for example, a center position. This movement is called a self-alignment effect. That is, the first terminal 31 in FIG.
When the front end portion of the connection pad 212 facing the extending direction of the first end portion 212a is the first end portion 212a and the rear end portion is the second end portion 212b, the boundary between the tail portion 31b and the solder 4 and the first end portion 212a. Is shorter than or equal to the shortest distance between the boundary between the tail portion 31b and the solder 4 and the second end portion 212b. The boundary refers to a portion where the solder 4 and the tail portion 31b are in contact with each other. In the movement by the self-alignment effect, the wall portion 32a is the third surface 2a of the circuit board 2.
Stop by touching. Therefore, the terminal portion 3 moves backward by the distance of the gap between the third surface 2a and the fourth surface 32b.

Finally, the circuit board 2 on which the terminal portion 3 is mounted is housed in the housing 1, and the USB according to the present embodiment
The device 10 is completed.

According to the USB device 10 according to the present embodiment, due to the self-alignment effect due to the surface tension of the solder 4 and the wall portion 32a of the insulating member 32, the connection pad 212 on the circuit board 2 is located at the front side or the center portion. The central portion of the tail portion 31b of the first terminal 31 can be adhered to the position, and the possibility that the positional relationship between the connection pad 212 and the tail portion 31b becomes uneven can be reduced. Therefore, the connection between the circuit board 2 and the terminal portion 3 can be further stabilized.

For example, when the reflow process is performed after the tail portion 31b is placed in the central portion, not in front of the connection pad 212, the tail portion 31b is in the X-axis direction and the Y-axis direction with respect to the circuit board 2 due to the self-alignment effect. Either can move. In this embodiment, by placing the tail portion 31b in front of the connection pad 212 in advance, the tail portion 31b moves only to the rear by the self-alignment effect, and a desired position on the connection pad 212 (here, the central portion or the central portion). Position on the front side of the portion). In addition, when the center part of the tail part 31b is located behind the center part of the connection pad, the connection pad 212 is used.
Since the moving distance of the tail portion 31b increases and positional displacement may occur, it is desirable that the tail portion 31b is located at the center portion of the connection pad 212 or at the front side of the center.

Further, since the wall portion 32a is in contact with the circuit board 2, when the USB device 10 is inserted into the receptacle, for example, the wall portion 32a collides with the receptacle and is pushed, so that the insulating member 32 is deformed, and further, the first terminal 31 is used. When the connection portion between the first terminal 31 and the connection pad 212 is damaged, the possibility of a connection failure is reduced.

In the present embodiment, the connection pad 212 on the circuit board 2 has been shown to be connected to the tail part 31b, but the connection part with the connection pad 212 is not limited to the tail part 31b.
For example, in the case of the first terminal 31 having a shape as shown in FIG. 5, the connection portion between the receptacle connecting portion 31a and the tail portion 31b may be used. In FIG. 5, the terminal portions 3 other than the first terminals 31 are omitted for convenience.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.

The second embodiment is different from the first embodiment in the shape of the connection pad, but the other configuration and manufacturing method are the same as those in the first embodiment. Therefore, only different parts from the first embodiment will be described, and similar parts will be omitted.

FIG. 6A is a schematic plan view showing a part of the terminal unit 3 and the circuit board 2 of the USB device 10 according to the second embodiment. FIG. 6B shows an enlarged plan view of the connection pad 212.

As shown in FIG. 6, in the present embodiment, the connection pad 212 has a shape in which two large and small squares are combined. In the case of FIG. 5, a combination of rectangles, a rectangle having a small area is provided in front of the circuit board 2, and a rectangle having a large area is provided behind the circuit board 2. By forming the connection pad 212 in such a shape, the distance by which the terminal portion 3 (tail portion 31b) can move during movement due to the self-alignment effect is increased.

The reason will be described below. When the solder 4 is applied to the connection pad 212 having the above shape, the relative amount of the applied solder 4 increases in the square having a larger area than in the square having a small area. Here, the tail portion 31b is placed on a square having a small area among the connection pads. Since the surface tension during the reflow process increases as the amount of solder 4 increases, the tail portion 31b is strongly attracted by the solder 4 on the rectangular side of the connection pad having a larger area.
Therefore, the movable distance due to the self-alignment effect is increased.

Further, as a modification of the second embodiment, the connection pad 212 can be shaped as shown in FIGS. As shown in FIG. 7A, the two large and small quadrilaterals are a trapezoid and a rectangle. A trapezoid is provided in front of the circuit board 2 and a rectangle is provided in the rear of the circuit board 2. In the case of the modified example, since the joint portion of a square that is larger and smaller than the connection pad 212 of FIG. 5 is gentle,
The variation in mobility due to the self-alignment effect is further reduced.

Note that the connection pad 212 is not limited to a square combination having a size relationship, and if the area of the connection pad 212 on the rear side of the circuit board 2 is larger than the area of the connection pad on the front side, for example, FIG. As described above, the present invention can also be applied to triangles and other shapes.

In the present embodiment, the quadrangle includes a case where the corners of the quadrangle are rounded as shown in FIG. 7C, for example.

As described above, according to the USB device 10 according to the present embodiment, the mobility due to the self-alignment effect can be increased by making the area of the connection pad 212 larger in the rear than in the front of the circuit board 2. . Therefore, the fourth surface 32b of the terminal portion 3 and the circuit board 2
This can be applied when the gap with the third surface 2a is large.

Although some embodiments have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Case 2 Circuit board 2a 3rd surface 3 Terminal part 10 USB apparatus 11 Opening part 21 Wiring board 21a 1st surface 21b 2nd surface,
22 Memory chip 23 Controller chip 24 Resin layer 31 1st terminal 31a Receptacle connection part 31b Tail part 32 Insulating member 32a Wall part 32b 4th surface 33 2nd terminal 211,212 Connection pad

Claims (5)

A USB device capable of transferring data by connecting to a receptacle,
A circuit board including a wiring board including a first surface and a second surface located on the opposite side of the first surface and having a connection pad; and a semiconductor component mounted on the first surface;
A second terminal including a connection terminal having a connection portion electrically connected to the connection pad, and an insulating member having a wall portion outside the circuit board and projecting along a thickness direction of the circuit board. A terminal portion placed on the surface of
Solder located between the connection pad and the connection site;
With
The wall is in contact with the circuit board;
The connection pad has a first end on the connection terminal side and a second end on the opposite side to the first end, facing each other in the extending direction of the connection terminal;
The shortest distance between the boundary between the connection site and the solder and the first end is shorter than or equal to the shortest distance between the boundary between the connection site and the solder and the second end. USB device. 2. The USB device according to claim 1, wherein the shape of the connection pad is such that two quadrangles are adjacent to each other, and the area closer to the terminal portion is smaller in area than the square far from the terminal portion. . Applying solder to connection pads on the top surface of the circuit board having a pair of opposing first and second side surfaces;
A method of manufacturing a USB device, wherein a connection terminal is placed on the solder, and the connection terminal is bonded to the connection pad by reflow after placement,
The connection terminal is fixed to an insulating member having a wall portion provided along the first side surface outside the circuit board,
The connection part of the connection terminal with the connection pad is placed at a position biased toward the first side surface on the solder,
The USB device manufacturing method, wherein the wall portion and the circuit board are in contact with each other after the reflow. 4. The method of manufacturing a USB device according to claim 3, wherein a connection portion of the connection terminal with the connection pad moves to the second side surface by the reflow. 5. The method of manufacturing a USB device according to claim 3, wherein an area of the connection pad increases from the first side surface side to the second side surface side.

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