JP2002299859A - Structure for mounting printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for mounting a printed board capable of preventing the possibility of breaking an electronic component and a pattern wiring mounted on the printed board. SOLUTION: An elastic supporting member 117 is mounted in the mounting hole 31 of a printed board 3 so as to be in contact with the inner peripheral surface of the mounting hole 31. When an external force is applied to the printed board 3, the supporting member 117 is deflected to enable the printed board to move.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board mounting structure to be mounted inside an electronic device such as a portable telephone.

[0002]

2. Description of the Related Art In recent years, electronic devices such as portable telephones have been rapidly miniaturized, and a large number of components such as printed circuit boards and liquid crystal display elements are mounted in a case at high density.

[0003] In particular, since printed circuit boards can be mounted at high density, printed circuit boards are mounted in most electronic devices.

Conventional example 1 in which a printed circuit board is mounted inside
Will be described with reference to the drawings.

FIG. 13 is a rear view of a portable telephone as an electronic apparatus. In the figure, reference numeral 1 denotes a mobile phone, in which two exterior housings, a front case and a rear case, are fitted to each other, and are fixed by screws 2 at four places from the rear side.

FIG. 14 is a perspective view showing the internal structure of the mobile phone 1, wherein 11 is a front case molded of ABS resin or the like, 12 is a rear case fitted to the front case 11, and 121 is a rear case 12. And four through holes for screwing. Reference numeral 111 denotes a boss formed on the front case 11 so as to correspond to the through hole 121 of the rear case 12, and four bosses are formed in the same number as the through holes 121. An enlarged perspective view of the boss 111 is shown in FIG. FIG. 15 is a perspective view illustrating the structure of the boss 111 of the first conventional example. Boss 111 is front case 1
1 extends from the inner bottom surface 113 in the direction of the printed circuit board 3, and the extended end is formed in a cylindrical shape having substantially the same diameter as the inner peripheral surface of the mounting hole 31 so as to be able to pass through the mounting hole 31 of the printed circuit board 3. ing. In addition, a screw hole 112 for screwing the screw 2 is formed in one end surface of the boss 111.

Reference numeral 3 denotes a printed circuit board, and as shown in FIG.
15 and a holding rib 125 provided on the rear case 12, so that the holding member 125 is vertically sandwiched and held. Further, the boss 111 is inserted into the mounting hole 31 penetrating the printed circuit board 3, and the mounting hole 31 is positioned and restricted from moving in the horizontal direction. 3
Reference numeral 2 denotes an electronic component mounted on the surface of the printed board 3.

Next, a description will be given of a printed circuit board mounting structure in the portable telephone of the first conventional example.

FIG. 16A is a partial cross-sectional view (A-A cross section of FIG. 13) for explaining the configuration of the boss portion of the conventional example 1, and FIG.
FIG. 17B is a cross-sectional view taken along line BB of FIG.

The printed board 3 is provided between the front case 11 and the rear case 12 and has a front case holding rib 115 and a rear case 12 holding rib 1 serving as holding members.
The positioning and holding are carried out in the vertical direction by 25. The front case 11 and the rear case 12 are fitted and screwed together with the screws 2.

The four bosses 111 having a cylindrical shape substantially the same diameter as the inner peripheral surface of the mounting hole 31 are provided with four mounting holes 31.
The printed circuit board 3 is attached to the front case 11 as a base by the printed circuit board 3.
Are positioned in the direction parallel to the substrate surface.

Next, assume a state in which a load due to an external force is applied to the portable telephone in the first conventional example configured as described above.

For example, if there is a dimensional error between the distance between the bosses 111 and the distance between the mounting holes 31 due to a manufacturing error of the printed circuit board 3 or the like, the mounting holes 31 of the printed circuit board 3 The boss 111 is forcibly inserted and incorporated. Therefore, the printed circuit board 3
Is always subjected to a compressive force or a tensile force by the boss 111.

When the mobile phone 1 is dropped, the front case 11 or the rear case 12 receives a large external force due to a drop impact. Due to this external force, the front case 11 and the rear case 12 are instantaneously deformed and the distance between the bosses 111 is changed, so that a compressive force or a tensile force is instantaneously applied to the printed circuit board 3.

Next, Conventional Example 2 will be described with reference to the drawings.

FIG. 17 is a sectional view showing a printed circuit board mounting structure according to Conventional Example 2. In the figure, 15 is A
It is a casing as a base formed of BS resin or the like. Fifteen
Reference numeral 1 denotes a boss extending from the bottom surface 153 inside the housing 15 toward the printed circuit board 3 (upward in the drawing). This boss 1
Reference numeral 51 denotes a cylindrical shape having a diameter larger than the inner peripheral surface of the mounting hole 31 of the printed circuit board 3, and a threaded hole 152 is formed in an extended end face on one end side. The periphery of the mounting hole 31 of the printed circuit board 3 is fastened and fixed to one end of the boss 151 by the screw 2.

Next, it is assumed that a load due to an external force is applied to the printed circuit board mounting structure configured as described above.

That is, this printed circuit board mounting structure also fixes the mounting hole 31 of the printed circuit board 3 to the boss 151 to restrict horizontal movement. Therefore, when the portable telephone receives a drop impact, a compressive force or a tensile force is instantaneously applied to the printed circuit board 3 as in the first conventional example.

[0019]

In the conventional printed circuit board mounting structure, the mounting hole of the printed circuit board is fixed to the boss of the case to restrict the horizontal movement. If there is, a compressive force or a tensile force is applied to the printed circuit board, and there is a possibility that electronic components mounted on the printed circuit board may be damaged or the pattern wiring may be disconnected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a printed circuit board mounting structure which does not cause damage to electronic components mounted on the printed circuit board or breakage of pattern wiring. The purpose is.

[0021]

According to a first aspect of the present invention, there is provided a printed circuit board mounting structure comprising: a base, a holding member for positioning and holding a printed circuit board having electronic components mounted on its surface in a vertical direction; One end is fixed integrally with the base, corresponding to the position of the mounting hole formed as
The other end comprises an elastic supporting portion provided so as to contact the inner peripheral surface of the mounting hole at a plurality of locations.

According to a second aspect of the present invention, there is provided a printed circuit board mounting structure comprising: a base, a holding member for positioning and holding a printed circuit board having electronic components mounted on its surface in a vertical direction, and penetrating the printed circuit board. The support having elasticity, which corresponds to the position of the mounting hole, extends from the base in the direction of the printed circuit board, and is provided such that the extended end side contacts the inner peripheral surface of the mounting hole at a plurality of locations. It is composed of members.

According to a third aspect of the present invention, there is provided a printed circuit board mounting structure, comprising: a base, a holding member for vertically positioning and holding a printed circuit board having electronic components mounted on a surface thereof, and one end penetrating the printed circuit board. A boss extending from the base through the mounting hole formed in the above, fixed to one end of the boss, one end of the boss extends toward the mounting hole of the printed circuit board, and the one end is formed on the inner periphery of the mounting hole. It is constituted by a support member having elasticity provided so as to be in contact with the surface at a plurality of places.

According to a fourth aspect of the present invention, there is provided a printed circuit board mounting structure, wherein a base, a screw to be screwed into the base through a mounting hole formed through the printed circuit board, and a locking portion are formed. One end side includes a support member having elasticity extended from the base toward the printed board,
The locking portion includes a first locking portion provided so as to sandwich the printed board with the screw, and a second locking portion provided so as to be in contact with the inner peripheral surface of the mounting hole at a plurality of locations. It is constituted so that it consists of.

According to a fifth aspect of the present invention, there is provided a printed circuit board mounting structure, comprising: a base, a holding member for mounting the printed board on which electronic components are mounted on the surface, on the base, and one end penetrating the printed board. A boss extending from the base through the mounting hole formed as described above, an elastic support member fixed to one end of the boss and having one end on which a locking portion is formed extending toward the printed circuit board; And a second locking portion provided so as to contact a first locking portion provided to sandwich the printed board with the holding member and an inner peripheral surface of the mounting hole at a plurality of locations. And a locking portion.

A printed circuit board mounting structure according to a sixth aspect of the present invention is the printed circuit board mounting structure according to any one of the first to fifth aspects, wherein the support member is in contact with the mounting hole. The portion is constituted by a plurality of members formed along the inner peripheral surface shape of the mounting hole.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the Invention Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the structure of a boss applied to the printed circuit board mounting structure according to the first embodiment of the present invention, and FIG. 2 (a) is a portion showing the configuration around the boss according to the first embodiment of the present invention. FIG. 2B is a sectional view, and FIG.
It is sectional drawing in the BB line of (a).

In the figures, the same reference numerals as those shown in FIGS. 13 to 17 indicate the same or corresponding parts.

Reference numeral 111A denotes a boss extending through the mounting hole 31 of the printed circuit board 3 and extending from the front case 11 serving as a base. Reference numeral 117 denotes a position corresponding to the mounting hole 31, and the outer periphery of the boss 111A extends from the inner bottom surface 113 of the front case 11. 2B. The support ribs extend in the direction of the printed circuit board 3 along the sides. The support ribs have end portions extending as shown in FIG. And four members formed in an arc shape along with are provided so that the extended end portions are in contact with the inner peripheral surface of the mounting hole 31, respectively.

Next, it is assumed that an external force is applied to the mobile phone 1 to which the printed circuit board mounting structure according to the first embodiment configured as described above is applied.

FIG. 3 is a sectional view showing a state in which the printed board 3 is subjected to an external force due to a manufacturing error of the printed board 3 or the like or a drop impact.

That is, the support rib 117 has elasticity, and when an external force is applied to the printed board 3, the support rib bends as shown in FIG. Therefore, a compression force or a pulling force does not act on the printed circuit board 3 by moving.

Embodiment 2 of the Invention Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a perspective view showing the structure of a boss to which the printed circuit board mounting structure according to the second embodiment of the present invention is applied. FIG. 5 (a) shows the printed circuit board mounting structure according to the second embodiment of the present invention. FIG. 5B is a cross-sectional view taken along line BB in FIG. 5A.

In the figure, reference numeral 111a denotes a support member which is fixedly held between one end of a boss 111A and the rear case 12 by screws 2, and the distal end of a leg 118 extending downward is provided on the inner peripheral surface of the mounting hole 31 of the printed circuit board 1. In contact. The leg 118 has elasticity, and is formed of four members formed in an arc along the inner peripheral surface of the mounting hole 31 as shown in FIG. 5B.

Next, it is assumed that an external force is applied to the printed circuit board 3.

That is, the leg 118 of the support member 111a has elasticity and bends when an external force is applied to the printed circuit board 3;
The movement of the printed circuit board 3 is allowed. Therefore, a compression force or a pulling force does not act on the printed circuit board 3 by moving.

Embodiment 3 of the Invention Next, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 6A is a partial sectional view showing a configuration around a boss to which the printed circuit board mounting structure according to the third embodiment of the present invention is applied, and FIG. 6B is a sectional view taken along the line CC of FIG. 6A.
6 (c) is an enlarged view of a portion D in FIG. 6 (a).

In the figure, 151A is a boss extending from the bottom surface 153 of the casing 15 as a base through the mounting hole 31 of the printed circuit board 3, 2A is a screw screwed to the boss 151A, and 157 is a boss 151 A support rib as a support member extending from the bottom surface 153 of the housing 15 on the outer peripheral side toward the printed circuit board 3, and one end extended as shown in FIG. It is composed of four elastic members formed in an arc shape along the line. 157
a is a support rib 157 as shown in the enlarged view of FIG.
The first locking portion 1 formed on one end side of the first portion and provided so as to sandwich the printed circuit board 3 with the screw 2 around the mounting hole 31.
57b is formed on one end side of the support rib 157,
The second locking portion is provided so as to be in contact with the inner peripheral surface of the first portion at four places.

In this embodiment, the printed circuit board 3 is vertically positioned and held by being sandwiched between the first locking portion 157a and the screw 2A. However, the printed board 3 is not firmly held as in the prior art. The printed circuit board 3 is held so as to be movable in the horizontal direction.

Next, let us consider a case where an external force is applied to the printed circuit board mounting structure according to the third embodiment configured as described above.

FIG. 7 is a diagram showing a state of the support rib 157 when a load is applied to the printed circuit board 3.

That is, when an external force is applied to the printed board 3, the supporting ribs 157 are bent as shown in the figure, and the printed board 3 moves in the horizontal direction. Therefore, no compressive force or tensile force due to external force is applied to the printed circuit board 3.

FIGS. 8 and 9 show a modification of the third embodiment.

In the third embodiment, the printed circuit board 3 is sandwiched between the bottom surface of the screw seat of the screw 2A and the first locking portion 157a to hold the printed circuit board 3 in the up-down direction, as shown in FIG. A spacer 40 is interposed between the screw 2A and the boss 151A, and the spacer 40 and the first locking portion 157a
May hold the printed circuit board 3.

Further, by disposing another boss 161 on the boss 151A as shown in FIG. 9 without using the screw 2A, the printed board 3 is held by the boss 161 and the first locking portion 157a. It may be a thing.

Embodiment 4 of the Invention Next, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 10A is a sectional view showing a configuration around a boss to which the printed circuit board mounting structure according to the fourth embodiment of the present invention is applied, and FIG.
FIG. 10C is a cross-sectional view taken along line C. FIG.
It is an enlarged view of a part.

In the drawing, reference numeral 155 denotes holding ribs as holding members extending from the bottom surface 153 of the housing 15 for mounting the printed circuit board 3 on the housing 15, and is provided at a plurality of locations. . 41 is boss 151A by screw 2A
Is formed as a support member fixed to one end of the base member, and has an elastic leg 418 extending downward. As shown in FIG. 10B, the leg 418 is formed of four members whose one ends extending downward are formed in an arc shape along the inner peripheral surface of the mounting hole 31. As shown in FIG. 10C, a first locking portion 418a is formed on one end side of the leg 418, and is provided so as to sandwich the printed circuit board 3 with the holding rib 155 around the mounting hole 31. It is a second locking portion formed on one end side of the support rib 418 and provided so as to be in contact with the inner peripheral surface of the mounting hole 31 at four places.

The printed board mounting structure according to the fourth embodiment includes a holding rib 155 and a first locking portion 4 of a leg 418.
The printed circuit board 3 is held in the up-down direction by sandwiching the printed circuit board 3 with the printed circuit board 18a.

That is, when a horizontal external force is applied to the printed circuit board 3, the legs 418 of the support member 41 as shown in FIG.
Is bent, and the printed circuit board 3 moves in the direction in which the external force is received. Therefore, no compressive force or tensile force is applied to the printed circuit board 3 by an external force.

Embodiment 5 of the Invention Next, a fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 12A is a sectional view showing a configuration around a boss to which the printed circuit board mounting structure according to the fifth embodiment of the present invention is applied, and FIG.
FIG. 12C is a cross-sectional view taken along line C-C in a state where an external force is applied to the printed circuit board 3.

In the drawing, reference numeral 159 denotes an elastic supporting rib extending outward from the outer peripheral surface of the boss 151A and having one end contacting the inner peripheral surface of the mounting hole 31.
“a” is a bent portion bent at one end of the support rib 159 along the inner peripheral surface of the mounting hole 31. The support rib 159 is formed integrally with the boss 151A. However, the boss 151A is divided in the middle so as to include the support rib 159, molded as a separate member, and then integrated by bonding, fitting, or the like. Can be formed.

Printed circuit board 3 in the fifth embodiment
Are held by the boss 161 and the holding rib 155 in the same manner as in FIG.

FIG. 12C shows a state where an external force is applied to the printed circuit board 3.

That is, when a horizontal external force is applied to the printed board 3, the bent portion 159a of the support rib 159 is bent as shown in FIG. 12C, and the printed board 3 moves. Therefore,
No compressive or tensile force is applied to the printed circuit board 3 by an external force.

[0060]

As described above, according to the present invention,
Since the supporting member having elasticity is provided so as to be in contact with the inner peripheral surface of the mounting hole of the printed board, the supporting member is bent when an external force is applied to the printed board, and the printed board can move. Therefore, there is an effect that disconnection of electronic components and wiring patterns mounted on the printed circuit board can be prevented without applying a compressive force or a tensile force to the printed circuit board due to an external force.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a boss applied to a printed circuit board mounting structure according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a configuration around a boss according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state where the printed circuit board is subjected to an external force due to a manufacturing error of the printed circuit board or the like or a drop impact.

FIG. 4 is a perspective view showing a boss structure to which a printed circuit board mounting structure according to a second embodiment of the present invention is applied.

FIG. 5 is a cross-sectional view showing a configuration around a boss to which a printed circuit board mounting structure according to a second embodiment of the present invention is applied.

FIG. 6 is a partial cross-sectional view showing a configuration around a boss to which a printed circuit board mounting structure according to a third embodiment of the present invention is applied.

FIG. 7 is a diagram illustrating a state of a support rib when a load is applied to a printed circuit board.

FIG. 8 is a partial cross-sectional view illustrating a configuration of a boss portion to which a printed circuit board mounting structure according to a modification of the third embodiment of the present invention is applied.

FIG. 9 is a partial cross-sectional view illustrating a configuration of a boss to which a printed circuit board mounting structure according to a modification of the third embodiment of the present invention is applied.

FIG. 10 is a cross-sectional view showing a configuration around a boss to which a printed circuit board mounting structure according to a fourth embodiment of the present invention is applied.

FIG. 11 is a diagram illustrating a state of a leg of a support member when a load is applied to a printed circuit board;

FIG. 12 is a sectional view showing a configuration around a boss to which a printed circuit board mounting structure according to a fifth embodiment of the present invention is applied.

FIG. 13 is a rear external view of the mobile phone.

FIG. 14 is a perspective view showing the internal structure of the mobile phone.

FIG. 15 is a perspective view showing the structure of a boss of Conventional Example 1.

FIG. 16 is a partial cross-sectional view showing a configuration of a boss portion of Conventional Example 1.

FIG. 17 is a cross-sectional view illustrating a printed circuit board mounting structure according to Conventional Example 2.

[Explanation of symbols]

1 mobile phone, 11 front case, 12 rear case, 15 housing, 111a, 41 support member,
111, 111A, 151, 151A boss, 11
2, 152 screw hole, 113, 153 bottom surface, 11
5, 125, 155 Holding rib, 117, 157, 1
59 support ribs, 118, 418 legs, 157a,
418a first locking portion, 157b, 418b second locking portion, 121 through hole, 2, 2A screw, 3 printed circuit board, 31 mounting hole, 32 electronic component, 40
Spacer.

Claims (6)

[Claims] 1. A base, a holding member for vertically positioning and holding a printed board on which electronic components are mounted on a surface, and mounting holes formed through the printed board, one end of which is integrated with the base. A printed circuit board mounting structure, characterized in that the printed circuit board mounting structure further includes an elastic support member fixed to the mounting hole and having the other end contacting the inner peripheral surface of the mounting hole at a plurality of locations. 2. A substrate, a holding member for vertically positioning and holding a printed circuit board on which electronic components are mounted on a surface, and mounting holes formed through the printed circuit board. In the direction of
A printed circuit board mounting structure, comprising: a support member having elasticity provided such that the extended end side contacts the inner peripheral surface of the mounting hole at a plurality of locations. 3. A base, a holding member for positioning and holding a printed circuit board having electronic components mounted on its surface in a vertical direction, and one end extending from the base through a mounting hole formed through the printed circuit board. Boss, which is fixed to one end of the boss, has one end extending toward the mounting hole of the printed circuit board, and has elasticity provided such that the one end contacts the inner peripheral surface of the mounting hole at a plurality of locations. A printed circuit board mounting structure comprising a support member. 4. A screw which is screwed into the base through a mounting hole formed through the base and the printed board, and one end on which a locking portion is formed extends from the base toward the printed board. A support member having elasticity, wherein the locking portion contacts a first locking portion provided so as to sandwich the printed board with the screw and an inner peripheral surface of the mounting hole at a plurality of locations. A printed circuit board mounting structure, comprising a second locking portion provided. 5. A base, a holding member for mounting a printed board on which electronic components are mounted on the surface thereof, and one end extending from the base through a mounting hole formed through the printed board. The projected boss includes an elastic supporting member fixed to one end of the boss and having one end on which a locking portion is formed extending toward a printed board, and the locking portion holds the printed board on the printed board. A printed circuit board mounting comprising: a first locking portion provided to be sandwiched by a holding member; and a second locking portion provided to be in contact with the inner peripheral surface of the mounting hole at a plurality of locations. Construction. 6. The support member according to claim 1, wherein a portion in contact with said mounting hole comprises a plurality of members formed along the inner peripheral surface shape of said mounting hole. The printed circuit board mounting structure according to any one of the above.