JP4107920B2 - Portable electronic devices - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable electronic device configured by arranging a plurality of printed circuit boards inside a cabinet, such as a portable audio player and a cellular phone.
[0002]
[Prior art]
For example, a portable audio player (IC recorder) incorporating an IC memory constitutes a flat cabinet (1) by combining the first cabinet half (2) and the second cabinet half (3) as shown in FIG. A display (11) and operation keys (12) are provided on the surface.
[0003]
In the cabinet (1), as shown in FIG. 16, the first printed circuit board (4) and the second printed circuit board (5) are arranged in two upper and lower stages, and are installed on both printed circuit boards (4) and (5). The pair of connectors (41) and (51) are fitted to each other, and both printed circuit boards (4) and (5) are electrically connected to each other.
A plurality of electronic components are mounted on both printed circuit boards (4) and (5), respectively. As one of the electronic components, the first printed circuit board (4) has a surface facing the second printed circuit board (5). In addition, a BGA (Ball Grid Array) (42) is surface-mounted.
[0004]
Since the BGA (42) has a low bonding strength to the printed circuit board and is weak against an impact force, an intermediate bracket (6) having a protective sheet (7) on the surface as shown in FIG. 5), a protective structure in which the protective sheet (7) is pressure-bonded to the surface of the BGA (42) is employed.
As shown in FIG. 16, the intermediate bracket (6) has a pair of hooks (61) (61) on both sides of the bracket body (60), and the hooks (61) (61) are connected to the second printed circuit board (5). The pair of through-holes (52) and (52) are attached to the second printed circuit board (5).
[0005]
As shown in FIG. 17, the second printed circuit board (5) is supported at a certain height by bosses (32) and (33) protruding from the inner surface of the second cabinet half (3).
On the other hand, the first printed circuit board (4) includes a boss (21) protruding from the inner surface of the first cabinet half (2) and a protruding piece (31) protruding from the side of the second cabinet half (3). In the meantime, the gap G (0.2 to 0.3 mm) in the direction of approaching and separating from the inner surface of the first cabinet half (2) is left behind.
[0006]
As described above, the intermediate bracket (6) is interposed between the first printed circuit board (4) and the second printed circuit board (5), and the protective sheet (7) is pressure-bonded to the surface of the BGA (42). The strength of the assembly structure between the substrates (4) and (5) and the cabinet (1) is increased, and the impact force acting on the BGA (42) is reduced.
[0007]
Further, since the first printed circuit board (4) is held with play in the direction of approaching and separating from the inner surface of the first cabinet half (2), the floats when the connectors (41) (51) are soldered. Even when the first printed circuit board (4) is assembled in an inclined posture as shown in FIG. 18 due to the misalignment of the connectors (41) (51), the first cabinet half (2) The gap G provided between the boss (21) of the first cabinet and the protruding piece (31) of the second cabinet half (3) allows the first printed circuit board (4) to be tilted, and the connector (41) (51) Unreasonable force does not act.
Further, as shown by a chain line in FIG. 19, even when the first printed circuit board (4) is warped, the boss (21) of the first cabinet half (2) and the second cabinet half (3) Since the gap G is provided between the projecting piece (31), the first printed circuit board (4) can be supported while being bent.
[0008]
As a BGA substrate support structure, a semiconductor device is known in which a BGA substrate is supported on a printed circuit board via a fixing rod (see, for example, Patent Document 1).
A mounting structure in which a BGA is mounted on a printed circuit board via a buffer member is known (see, for example, Patent Document 2).
[0009]
[Patent Document 1]
JP-A-10-209213 ([0013], [FIG. 1])
[Patent Document 2]
JP 2000-114433 A ([0012], [FIG. 1])
[0010]
[Problems to be solved by the invention]
However, in the structure shown in FIGS. 16 and 17, when the first printed circuit board (4) is supported in an inclined posture as shown in FIG. 18, the protective sheet (7) attached to the surface of the intermediate bracket (6). ) Did not adhere to the surface of BGA (42), and there was a problem that a sufficient protective effect could not be obtained.
Further, when the central portion of the first printed circuit board (4) is bent toward the second printed circuit board (5) as shown in FIG. 19, the protective sheet (7) is applied to the surface of the BGA (42) with an excessive force. On the contrary, there was a problem that the protective effect was diminished.
[0011]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a structure capable of obtaining a sufficient protection effect for electronic components on a printed circuit board even when the printed circuit board is inclined or bent in a portable electronic device. .
[0012]
[Means for solving the problems]
In the portable electronic device according to the present invention, the first and second cabinets (2) and the second cabinet half (3) combined to each other are electrically connected to each other inside the cabinet (1). One printed circuit board (4) and a second printed circuit board (5) are arranged in two upper and lower stages. The first printed circuit board (4) is attached to the inner surface of the first cabinet half (2), while the second printed circuit board (5) is attached to the inner surface of the second cabinet half (3). 4) is supported with play in a direction approaching and separating from the inner surface of the first cabinet half (2).
An intermediate bracket (8) is interposed between the first printed circuit board (4) and the second printed circuit board (5). The intermediate bracket (8) is configured by interposing a spring (9) between a pair of bracket members (81) and (82), and the bracket members (81) and (82) are separated from each other by the spring (9). The surface of one bracket member (82) is pressed against the surface of a surface-mount type electronic component (BGA) mounted on the first printed circuit board (4).
[0013]
In a specific configuration, a protective sheet (7) is attached to the surface of the one bracket member (82), and the protective sheet (7) is pressure-bonded to the surface of a surface-mounted electronic component (BGA). Yes.
The spring (9) is formed in a coil shape that is separate from the bracket members (81) and (82), or a part of one of the bracket members (81) is cut up and formed in a bent arm shape. Has been.
[0014]
In the portable electronic device of the present invention, for example, when the first printed circuit board (4) is supported in an inclined posture, the intermediate bracket (8) is attached according to the inclination of the first printed circuit board (4). The constituting spring (9) contracts or expands due to elasticity and adjusts the posture of the bracket member (82) to which the protective sheet (7) is adhered, whereby the protective sheet (7) is in close contact with the electronic component. Maintained.
Further, when the central portion of the first printed circuit board (4) is bent toward the second printed circuit board (5) and the distance between the intermediate bracket (8) and the first printed circuit board (4) is reduced, the intermediate bracket The spring (9) constituting (8) is elastically contracted, and the pressure-bonding force of the protective sheet (7) to the electronic component is kept at an appropriate value.
[0015]
【The invention's effect】
According to the portable electronic device according to the present invention, even when the printed circuit board is tilted or bent, the spring of the intermediate bracket is stretched and contracted to absorb the tilt or bent of the printed circuit board. A sufficient protective effect can be obtained for electronic components.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the embodiment in which the present invention is implemented in the portable audio player shown in FIG. 14 will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 3, the portable audio player according to the present invention combines the first cabinet half (2) and the second cabinet half (3) to form a flat cabinet (1). The first printed circuit board (4) and the second printed circuit board (5) are arranged in two upper and lower stages in the interior, and a pair of connectors (41) (51) (51) installed on both printed circuit boards (4) (5) ) Are fitted to each other, and both printed circuit boards (4) and (5) are electrically connected to each other.
A plurality of electronic components are mounted on both printed circuit boards (4) and (5), respectively. As one of the electronic components, the first printed circuit board (4) has a surface facing the second printed circuit board (5). In addition, the BGA (42) is surface-mounted.
[0017]
Between the first printed circuit board (4) and the second printed circuit board (5), an intermediate bracket (8) having a protective sheet (7) adhered on the surface is interposed.
As shown in FIGS. 4 and 5, the intermediate bracket (8) has four compression coil springs (9), (9), (9), (9) between the first bracket member (81) and the second bracket member (82). The bracket members (81) and (82) are biased by the coil springs in a direction away from each other.
[0018]
Specifically, four pins (84) (84) (84) (84) projecting toward the second bracket member (82) are planted on both sides of the first bracket member (81). Ear portions (85) and (85) bent in an L-shape are formed on both side portions of the second bracket member (82). The first bracket member (81) and the second bracket member (82) are combined with the spring (9) attached to each pin (84), and the first bracket member (81) and the second bracket as shown in FIG. A spring (9) is interposed between the members (82).
[0019]
The intermediate bracket (8) includes a pair of hooks (83) and (83) protruding downward from both sides of the first bracket member (81), and the hooks (83) and (83) are the second print as shown in FIG. By being engaged with a pair of through holes (52) and (52) provided in the substrate (5), the substrate (5) is attached on the second printed circuit board (5).
[0020]
As shown in FIG. 1, the second printed circuit board (5) is supported at a certain height by bosses (32) and (33) protruding from the inner surface of the second cabinet half (3).
On the other hand, the first printed circuit board (4) includes a boss (21) protruding from the inner surface of the first cabinet half (2) and a protruding piece (31) protruding from the side of the second cabinet half (3). In the meantime, the gap G (0.2 to 0.3 mm) in the direction of approaching and separating from the inner surface of the first cabinet half (2) is left behind.
[0021]
As described above, the intermediate bracket (8) is interposed between the first printed circuit board (4) and the second printed circuit board (5), and the protective sheet (7) is pressure-bonded to the surface of the BGA (42). The strength of the assembly structure for the substrates (4) and (5) and the cabinet (1) is increased, and the impact force acting on the BGA (42) is reduced.
[0022]
Further, since the first printed circuit board (4) is held with play in the direction of approaching and separating from the inner surface of the first cabinet half (2), the floats when the connectors (41) (51) are soldered. Even when the first printed circuit board (4) is assembled in an inclined position as shown in FIG. 6 due to the misalignment of the connectors (41) and (51) during assembly, the first cabinet half A gap G provided between the boss (21) of (2) and the protruding piece (31) of the second cabinet half (3) allows the first printed circuit board (4) to be tilted, and the connector (41) ( 51) An unreasonable force will not act.
Further, in accordance with the inclination of the first printed circuit board (4), the four springs (9) built in the intermediate bracket (8) contract or expand, and the second is attached with the protective sheet (7). Since the posture of the bracket member (82) is adjusted and thereby the close contact state of the protective sheet (7) with respect to the BGA (42) is maintained, a sufficient protective effect can be obtained for the BGA (42).
[0023]
In addition, as shown by a chain line in FIG. 7, when the first printed circuit board (4) is warped and the central portion of the first printed circuit board (4) is bent toward the second printed circuit board (5), Since the gap G is provided between the boss (21) of the first cabinet half (2) and the projecting piece (31) of the second cabinet half (3), the first printed circuit board (4) is attached. It can be supported in a bent position.
In this case, the distance between the intermediate bracket (8) and the first printed circuit board (4) is reduced, but the spring (9) constituting the intermediate bracket (8) is elastically contracted, so that both bracket members (81) (82) Therefore, the pressure-bonding force of the protective sheet (7) to the BGA (42) is maintained at an appropriate value.
[0024]
8 to 13 show other embodiments in which the present invention is implemented in a portable audio player.
As shown in FIG. 8, the first printed circuit board (4) and the second printed circuit board (5) are vertically moved to the cabinet (1) formed by combining the first cabinet half (2) and the second cabinet half (3). A pair of connectors (41) and (51) arranged in two stages and placed on both printed circuit boards (4) and (5) are fitted together, and both printed circuit boards (4) and (5) are electrically connected to each other. Has been. A BGA (42) is mounted on the surface of the first printed circuit board (4) on the surface facing the second printed circuit board (5).
[0025]
Between the first printed circuit board (4) and the second printed circuit board (5), an intermediate bracket (8) having a protective sheet (7) adhered on the surface is interposed.
As shown in FIGS. 10 and 11, the intermediate bracket (8) is configured by combining the first bracket member (81) and the second bracket member (82), and on both sides of the first bracket member (81), A bent arm-shaped leaf spring (91) (91) is formed by cutting and raising a part of the first bracket member (81).
As shown in FIG. 9, the leaf spring (91) is housed in the ear portion (85) of the second bracket member (82), and is attached in a direction in which the bracket members (81) and (82) are separated from each other by the spring. It is energized.
[0026]
When the first printed circuit board (4) is assembled in an inclined posture as shown in FIG. 12, the springs (91) (91) of the intermediate bracket (8) are moved according to the inclination of the first printed circuit board (4). The posture of the second bracket member (82) to which the protective sheet (7) is adhered is adjusted by contraction or expansion, and thereby the close contact state of the protective sheet (7) with respect to the BGA (42) is maintained.
[0027]
Further, as shown by a chain line in FIG. 13, when the first printed circuit board (4) is warped and the central portion of the first printed circuit board (4) is bent toward the second printed circuit board (5), The springs (91) and (91) of the intermediate bracket (8) are elastically contracted, and the distance between the bracket members (81) and (82) is reduced. As a result, the pressing force of the protective sheet (7) against the BGA (42) is It is kept at an appropriate value.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of a portable electronic device according to the present invention.
FIG. 2 is an enlarged front view showing a main part of an intermediate bracket.
FIG. 3 is an exploded perspective view of the portable electronic device.
FIG. 4 is a perspective view of an intermediate bracket provided in the portable electronic device.
FIG. 5 is an exploded perspective view of the intermediate bracket.
FIG. 6 is a cross-sectional view showing the operation of the intermediate bracket when the first printed circuit board is inclined in the portable electronic device.
FIG. 7 is a cross-sectional view showing the operation of the intermediate bracket when the first printed circuit board is bent in the portable electronic device.
FIG. 8 is a cross-sectional view illustrating another configuration example of the portable electronic device according to the invention.
FIG. 9 is an enlarged side view showing a main part of the portable electronic device.
FIG. 10 is a perspective view of an intermediate bracket provided in the portable electronic device.
FIG. 11 is an exploded perspective view of the intermediate bracket.
FIG. 12 is a cross-sectional view showing the operation of the intermediate bracket when the first printed circuit board is inclined in the portable electronic device.
FIG. 13 is a cross-sectional view showing the operation of the intermediate bracket when the first printed circuit board is bent in the portable electronic device.
FIG. 14 is a perspective view illustrating an appearance of a portable electronic device.
FIG. 15 is a perspective view of a conventional intermediate bracket.
FIG. 16 is an exploded perspective view of a conventional portable electronic device.
FIG. 17 is a cross-sectional view of the portable electronic device.
FIG. 18 is a cross-sectional view showing a state in which the first printed circuit board is inclined in the portable electronic device.
FIG. 19 is a cross-sectional view showing a state where the first printed circuit board is bent in the portable electronic device.
[Explanation of symbols]
(1) Cabinet
(2) First cabinet half
(3) Second cabinet half
(4) First printed circuit board
(41) Connector
(42) BGA
(5) Second printed circuit board
(51) Connector
(7) Protection sheet
(8) Intermediate bracket
(81) First bracket member
(82) Second bracket member
(83) Hook
(9) Spring

Claims (4)

A first printed circuit board (4) and a second printed circuit board electrically connected to each other inside a cabinet (1) configured by combining the first cabinet half (2) and the second cabinet half (3). (5) is arranged in two upper and lower stages, and the first printed circuit board (4) is attached to the inner surface of the first cabinet half (2), while the second printed circuit board (5) is the second cabinet half (3). The first printed circuit board (4) is supported with play in a direction approaching and separating from the inner surface of the first cabinet half (2), and is attached to the inner surface of the first printed circuit board (4) and the second printed circuit board. An intermediate bracket (8) is interposed between (5), and the intermediate bracket (8) is configured by interposing a spring (9) between a pair of bracket members (81) and (82). (9) urges both bracket members (81) and (82) away from each other, Portable electronic device surface of Tsu preparative member (82), characterized in that it is crimped to the mounting surface mount electronic device on the surface of the first printed circuit board (4). A protective sheet (7) is attached to the surface of the one bracket member (82) constituting the intermediate bracket (8), and the protective sheet (7) is pressure-bonded to the surface of the surface mount electronic component. The portable electronic device according to claim 1. The spring (9) is formed in a coil shape that is separate from the bracket members (81) and (82), or is formed in a bent piece shape by cutting and raising a part of one of the bracket members (81). The portable electronic device according to claim 1 or 2. The portable electronic device according to any one of claims 1 to 3, wherein the surface-mounted electronic component is a BGA (42).

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