JPH11266087A - Mounting structure of printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed board mounting structure, which is capable of protecting a printed board and an electronic component arranged on it against damages, improving an electronic device in productivity, and reducing it in weight. SOLUTION: This mounting structure is constituted of a cutout 1a which is provided to the periphery of the printed board 1 and opened toward the edge of the board 1, a guide pin 3a installed in upright position to a case 3 where the printed board 1 is mounted, and an elastic support member 2 composed of a groove 2a which can be inserted into the cutout 1a, a hole part 2b which is engaged with the guide pin 3a, and a buffer part 2c, which is formed between the groove 2a and the hole 2b and thinner than its part around the groove 2a and the hole 2b. An elastic support member 2 is brought uniformly into contact with a cutout, so that brittle fractures hardly occur in a printed board 1, and only a cutout 1a opened toward the edge of the board 1 is provided to the periphery of the board 1, so that the board 1 can be easily processed and mounted by inserting the elastic support member 2 into the cutout 1a of the board 1, and the elastic support member 2 is superior in assembly workability.

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, and more particularly to a printed circuit board mounting structure used in a portable terminal device or the like in which a load or impact is easily applied to a printed circuit board from the outside.

[0002]

2. Description of the Related Art Conventionally, a printed circuit board mounted on a portable terminal device is easily subjected to a load or impact from the outside. In order to prevent the printed circuit board and electronic components disposed on the upper surface thereof from being destroyed, Various methods have been adopted.

[0003] For example, FIG.
According to the invention described in Japanese Patent Application Publication No. 7-107, the printed circuit board mounting structure 1
Reference numeral 0 denotes a printed circuit board, a holding member 12 for supporting the printed circuit board 11, a fixing member 13 for fixing the printed circuit board 11, and a fixing screw 14 for connecting the two members 12, 13. The applied load or impact is transmitted from the fixing member 13 to the printed circuit board 11 via the fixing screw 14.

Here, by setting the shape of the notch in the mounting portion of the printed circuit board 11 and the holding member 12 to an appropriate shape, a desired mounting strength can be obtained, and by deforming the holding member 12, The load and impact applied to the device can be reduced.

However, in the above-described conventional printed circuit board mounting structure, when a thin substrate material for the purpose of reducing the size and weight is used, such as a printed circuit board used for a portable terminal device, the printed circuit board is not used. There is a problem that stress is likely to concentrate near the engaging portion of the printed circuit board 11 with the holding member 12, and the printed circuit board itself is liable to cause brittle fracture.

Further, since the fixing screw 14 is used to fix the holding member 12 to the fixing member 13, it becomes an obstacle in improving the productivity of the printed circuit board mounting structure 10 and reducing the weight of the device. .

On the other hand, as a second conventional example, a printed circuit board mounting structure 20 described in Japanese Utility Model Laid-Open Publication No. 63-121489 shown in FIG. 9 includes a printed circuit board 21, a support member 22 made of an elastic material, and The printed circuit board 21 includes a guide pin 23 a of a housing 23 for positioning the support member 22 and a boss 23 b of the housing 23 for fixing the support member 22.
The support member 22 is previously attached to the mounting hole of the above, and these are pushed into the guide pins 23a to perform positioning. Further, the printed circuit board 21 is fixed via the support member 22 by pressing the support member 22 from above with the boss 23b of the housing 23.

However, this printed circuit board mounting structure 20
In this case, since the support member 22 needs to be attached to the mounting hole formed in the printed circuit board 21,
In addition, it is necessary to machine the support member 22, and it is necessary to make the outer diameter of the support member 22 larger than the mounting hole of the printed circuit board 21, and it is difficult to work by fitting the support member 22 into a hole smaller than the outer diameter. However, there is a problem in that productivity is hindered.

Further, since the support member 22 is fixed by pressing it with the boss 23b, the vicinity of the mounting portion of the printed circuit board 21 is easily restrained, and the degree of freedom of the mounting portion of the printed circuit board 21 is small. Therefore, even if the printed circuit board 21 is formed of an elastic body and the impact is absorbed, if the static bending and torsion deformation are large, the printed circuit board 21 is likely to be warped or bent, and the wiring of the printed circuit board 21 may be disconnected or broken. There is a problem that a crack is generated in the solder part of the soldered component.

In view of the above, the present invention has been made in view of the above-mentioned problems in the conventional mounting structure of a printed circuit board. Since brittle fracture and warpage or bending of the printed circuit board are unlikely to occur, it is possible to prevent damage to the printed circuit board and the electronic components disposed on the upper surface thereof, and it is easy to process the printed circuit board and has good workability during assembly, so production It is an object of the present invention to provide a printed circuit board mounting structure capable of improving the performance and reducing the weight of the device.

[0011]

According to the first aspect of the present invention,
A printed circuit board mounting structure, wherein a notch provided on the periphery of the printed circuit board and opened toward an edge of the printed circuit board, and a guide pin provided upright on a housing on which the printed circuit board is mounted. A groove that can be inserted into the notch, a hole that can be engaged with the guide pin, and is formed between the groove and the hole, and is formed thinner than the thickness of the groove and the periphery of the hole. It is characterized by being constituted by an elastic support member formed of a buffer portion.

According to a second aspect of the present invention, the elastic supporting member is formed in a substantially disk shape, and has a groove formed on an outer peripheral surface thereof and a central portion formed to have substantially the same thickness as the outer peripheral surface. And a buffer portion formed between the groove portion and the hole portion, and formed to be thinner than the thickness of the outer peripheral surface and the central portion.

According to a third aspect of the present invention, the elastic supporting member is formed in a substantially coma shape, a groove formed on the outer peripheral surface, and formed to have substantially the same thickness as the outer peripheral surface. A hole that is located in a plane separated from the plane where the hole exists, and is formed in a central portion having a smaller diameter than the outer peripheral surface, and is formed between the groove portion and the hole portion, and the outer peripheral surface and the central portion are formed. It is characterized by comprising a conical surface buffer part formed thinner than the thickness of

According to the first aspect of the present invention, since the elastic support member uniformly contacts the notch, the brittle fracture of the printed circuit board hardly occurs, and the printed circuit board has a peripheral portion toward the edge. It is easy to work because it only forms a notched part that is open and the elastic support member can be easily attached by simply inserting the elastic support member from the edge of the printed circuit board. It is only necessary to engage the guide pin provided on the body with the hole of the elastic support member, so that it is not necessary to use screws or the like. By appropriately selecting the elastic characteristics and shape of the elastic support member and the diameter of the guide pin to be combined, etc., static external force due to deformation such as torsion or bending of the housing, and impact due to impact or drop In addition, the elastic deformation of the support member dampens and suppresses the deformation of the printed circuit board, thereby preventing disconnection of the wiring of the printed circuit board and the occurrence of cracks in the solder of the soldered components.

According to the second aspect of the invention, the degree of elastic deformation of the elastic support member can be made relatively small.

According to the third aspect of the invention, the degree of elastic deformation of the elastic support member can be made relatively large.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific example of an embodiment of a printed circuit board mounting structure according to the present invention will be described with reference to the drawings.

FIG. 1 is a view showing a first embodiment of a printed circuit board mounting structure according to the present invention. The printed circuit board mounting structure 5 includes a printed circuit board 1, a support member 2,
It is constituted by the housing 3.

The printed circuit board 1 has a plurality of U-shaped notches 1a for attachment at appropriate positions around the periphery.

The support member 2 is a member made of an elastic material which is pushed into the notch 1a. For this material, a polymer material such as rubber, urethane, elastomer, and nylon, which has a large tolerance to deformation and a large restoring force, is preferable.

A notch 1a is formed on the outer peripheral surface of the support member 2.
Is formed. The width of the groove 2a is formed to be substantially the same as or slightly smaller than the thickness of the printed circuit board 1. A hole 2b into which the guide pin 3a of the housing 3 is inserted is formed in the center of the support member 2. The hole 2
The diameter of the hole 2b is slightly smaller than the diameter of the guide pin 3a in order to obtain the desired mounting strength and the degree of freedom of the guide pin 3a. Groove 2a around support member 2
A buffer 2c is provided between the hole 3b and the central hole 2b to reduce the thickness and deform and buffer the load and impact transmitted from the housing 3. By appropriately changing the shape of the buffer 2c, an appropriate buffer effect can be exhibited in various environments.

Whether the guide pin 3a is a part of the housing 3,
Alternatively, as shown in FIG. 2, a guide pin 3 a ′ may be provided separately from the housing 3. In that case, the guide pins 3 a ′ are integrated with the housing 3 by press fitting or the like.

Next, the operation of the printed circuit board mounting structure 5 having the above configuration will be described with reference to FIG.

As shown in FIG. 3A, the groove 2a of the support member 2 is pushed in the direction of arrow B into the notch 1a of the printed circuit board 1. Here, since the width of the groove 2a is substantially the same as or slightly smaller than the thickness of the printed circuit board 1, the support member 2 does not easily fall off the printed circuit board 1, and the support member 2 is still attached to the printed circuit board 1. Can be handled hereafter.

Next, as shown in FIG. 3B, with the support member 2 attached to the printed circuit board 1,
The support member 2 is inserted into the housing 3 via the guide pin 3a and the hole 2b (FIG. 1). Here, the diameter of the hole 2b is slightly smaller than the diameter of the guide pin 3a. Therefore, the printed circuit board 1 can be held by the friction between the support member 2 and the housing 3, and the assembly and maintenance of the printed circuit board mounting structure 5 can be performed without using screws or tools.

FIG. 4 shows a state in which the printed circuit board 1 is mounted on the housing 3 using the mounting structure 5 of the printed circuit board. FIG. Shows a twisted state. The displacement of the housing 3 due to the torsion is absorbed by the deformation of the buffer portion 2c of the support member 2, and the deformation of the housing 3 is not directly transmitted to the printed board 1, so that the warpage or bending of the printed board 1 is minimized. Can be held down.

FIG. 4B shows a state in which a shock in the direction of arrow E is applied to the housing 3 in a state where the printed circuit board 1 is mounted on the housing 3 using the support member 2. Due to this impact, the guide pin 3a momentarily moves in the E direction,
This displacement is buffered by the deformation of the buffer portion 2c of the support member 2, so that the impact of the housing 3 is not directly applied to the printed board 1, and the influence on the printed board 1 and the electronic components soldered to the upper surface thereof is affected. It can be kept to a minimum.

Next, the procedure for mounting the printed circuit board 1 on the housing 3 using the support member 2 will be described in detail with reference to FIG.

Here, the thickness of the printed circuit board 1 is 0.8 m.
m, the outer diameter is 8 mm by rubber molding, the diameter of the hole 2b is 1.8 mm, and the groove width of the groove 2a is 0.7 mm.
And a guide pin 3a having a diameter of 2 mm is integrally formed with the housing 3 by injection molding.

Notches 1a are formed at four places around the periphery of the printed circuit board 1. The support member 2 formed corresponding to the shape of the notches is moved in the direction F to form the notches 1a.
Press Here, the groove width of the groove 2a is 0.7 mm, the thickness of the printed circuit board 1 is 0.8 mm, and the support member 2 is pushed in by utilizing the elasticity of the rubber molding material. The support member 2 does not fall off from the substrate 1 and can be handled thereafter with the support member 2 still attached to the printed circuit board 1.

Printed circuit board 1 into which support member 2 has been pushed
The mounting of the printed circuit board 1 is completed only by lowering the guide pins 3a of the housing 3 from above in the G direction and press-fitting the holes 2b of the support members 2 into the guide pins 3a. Here, since the diameter of the hole 2b is 1.8 mm and the diameter of the guide pin 3a is 2 mm, the printed circuit board 1 can be held by friction caused by the elastic force of the support member 2.

Next, a second embodiment of the printed circuit board mounting structure according to the present invention will be described with reference to FIG.

In this embodiment, the groove 2a 'of the support member 2'
Is set to a height different from that of the groove 2a formed on the outer peripheral surface of the first embodiment of FIG. 1, the buffer 2c 'is formed to have a large conical surface, and the larger housing 3 is deformed. In this case, the degree of freedom with respect to shock and impact is increased, and the influence on the printed circuit board 1 is minimized. In addition, the material of the support member 2 ',
The relationship between the groove width of the groove 2a 'and the thickness of the printed circuit board 1, the relationship between the diameter of the hole 2b' and the diameter of the guide pin 3a, the buffer 2
The thickness of c ′ and the like are the same as those of the support member 2.

As shown in FIG. 7, the support member to be used is changed according to the position of the cutout portion 1a of the printed circuit board 1.

That is, the support member 2 having relatively small deformation is used for the center notch 1a in the vertical and horizontal directions of the printed board 1, and the notch 1a at the four corners of the printed board 1 is more deformed. The supporting member 2 'having a large degree of freedom is used. This support member 2 'is also moved in the H direction similarly to the support member 2, and is inserted into the notch 1a. By appropriately selecting the support members 2 and 2 'in this manner, the printed circuit board 1 can be reliably mounted on the housing 3 while minimizing deformation of the printed circuit board 1 due to twisting of the housing 3.

[0036]

According to the first aspect of the present invention, the printed circuit board is less likely to be brittlely broken, the processing is easy, the workability at the time of assembling is good, and there is no need to use screws or the like, so that the weight is reduced. It is possible to buffer the static external force due to deformation such as twisting or bending of the housing and the shock due to shock or drop by the elastic deformation of the support member, suppress the deformation of the printed circuit board and reduce the wiring of the printed circuit board. It is possible to provide a printed circuit board mounting structure capable of preventing the occurrence of cracks or the like in the disconnection or in the solder of the soldered component.

According to the second aspect of the present invention, since the degree of elastic deformation of the elastic support member can be made relatively small, the elastic support member is used in a place where the degree of freedom for deformation and impact of the housing is relatively small. It is possible to provide a printed circuit board mounting structure capable of performing the above.

According to the third aspect of the present invention, since the degree of elastic deformation of the elastic support member can be made relatively large, a portion requiring a relatively large degree of freedom with respect to deformation or impact of the housing is required. It is possible to provide a mounting structure of a printed circuit board that can be used for a printed circuit board.

[Brief description of the drawings]

FIG. 1 is a first view of a printed circuit board mounting structure according to the present invention.
It is a figure which shows an Example, (a) is a top view and (b) is a sectional view on the AA line of (a) of FIG.

FIG. 2 is a cross-sectional view showing a case where guide pins are formed as separate members from a housing in the printed circuit board mounting structure of FIG. 1;

3A and 3B are perspective views for explaining a procedure for mounting a printed circuit board and a support member of the printed circuit board mounting structure of FIG. 1, and FIG. 3A illustrates a state before the support member is mounted on the printed circuit board; (B) is a diagram showing a state after the support member is attached to the printed circuit board and before insertion into the guide pin.

4A and 4B are diagrams illustrating a deformation state of the support member 2 when an external force is applied to the housing in the printed circuit board mounting structure of FIG. 1, wherein FIG. 4A illustrates a state where a twist in a D direction is applied; (B) is a diagram showing a state in which an impact in the E direction is applied.

FIG. 5 is a perspective view for explaining how to assemble the printed circuit board mounting structure of FIG. 1;

FIG. 6 shows a second embodiment of the printed circuit board mounting structure according to the present invention.
It is sectional drawing which shows an Example.

FIG. 7 is a perspective view for explaining an assembly procedure of the printed circuit board mounting structure of FIG. 6;

FIG. 8 is a perspective view showing a first example of a conventional printed circuit board mounting structure.

FIG. 9 is a perspective view showing a second example of a conventional printed circuit board mounting structure.

DESCRIPTION OF REFERENCE NUMERALS 1 printed board 1a cutout 2, 2 'support member 2a, 2a' groove 2b hole 2c, 2c 'buffer 3 housing 3a, 3a' guide pin 5 printed board mounting structure

Claims (3)

[Claims] 1. A notch provided in a peripheral portion of a printed circuit board and opened toward an edge of the printed circuit board; a guide pin erected on a housing on which the printed circuit board is mounted; A groove that can be inserted into the groove, a hole that can be engaged with the guide pin, and a buffer formed between the groove and the hole, and formed to be thinner than the thickness of the groove and the periphery of the hole. A printed circuit board mounting structure comprising an elastic support member made of: 2. The elastic support member is formed in a substantially disk shape, and has a groove formed in an outer peripheral surface thereof, and a hole formed in a central portion having substantially the same thickness as the outer peripheral surface. The printed circuit board according to claim 1, further comprising a buffer portion formed between the groove portion and the hole portion, the buffer portion being formed thinner than the thickness of the outer peripheral surface and the central portion. Mounting structure. 3. The elastic support member is formed in a substantially coma shape, a groove formed on an outer peripheral surface, and formed to have substantially the same thickness as the outer peripheral surface, and is separated from a surface on which the outer peripheral surface exists. A hole that is present in the center and has a smaller diameter than the outer peripheral surface, and is formed between the groove and the hole, and is formed thinner than the thickness of the outer peripheral surface and the central portion. The printed circuit board mounting structure according to claim 1, wherein the mounting structure is constituted by a conical buffer portion formed.