JP2003152354A - Method and device for fixing substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a substrate fixing device and a method thereof which can ensure the wiring pattern area of a printed substrate, improve the appearance quality of a plastic case and reduce manhours for fixing a printed substrate to a case. SOLUTION: The substrate fixing device has screw fastening parts 12, 13 for fastening a printed substrate 20 to the inner side of a plastic case 10 by means of screws 31, 32, first contact members 14A to 14C in contact with a circumferential edge 20a in one side of the printed substrate 20 apart from the screw fastening parts 12, 13 and second contact members 15A to 15C in contact with the circumferential edge 20b of the other side of the printed substrate 20 apart from the screw fastening parts 12, 13. The first contact members 14A to 14C and the second contact members 15A to 15C are provided to positions corresponding to a short side 21 and a short side 23 each adjacent to a long side 22 of the circumferential edges 20a, 20b of the printed substrate 20, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board mounting apparatus and a board mounting method, and more particularly to a board mounting apparatus and a board mounting method in which the number of screw fastenings is reduced.

[0002]

2. Description of the Related Art Conventionally, when a printed circuit board is housed on the inner surface side of a plastic case (including a case that functions as a cover or a panel when mounted), a screw fastening portion that protrudes like a boss into the case. Is provided, and is screwed near the corners of the peripheral portion of the printed circuit board.

Further, when electronic parts such as knobs to be rotated and switches to be pressed are mounted on the printed circuit board, the screw fastening portion should carry the operating force thereof. An arrangement is adopted that is close to the electronic component.

For example, as shown in FIG. 6, the printed circuit board 50 has screws 61, 62, 63, 64, 65, 66, 6 as screws.
7, the corner portion CP51 and the corner portion C of the printed circuit board 50
P52, corner CP53, corner CP54, switch 55 mounted on the printed circuit board 50, portion 56 between corner CP51 and corner CP52, corner CP53 and corner C
The screw fastening portions 71, 72, 73 provided on the plastic case 70 so as to correspond to the portion 57 between P54,
It was screwed to 74, 75, 76 and 77 and housed inside the plastic case 70.

[0005]

However, in the above-mentioned conventional board mounting device and board mounting method,
The number of screw fastening parts increases, especially in-vehicle electronic devices (car navigation systems, car audio systems, LCD TVs, etc.)
When mounting a printed circuit board on which electronic components such as display elements and knobs are mounted on the back side of the front cover of, the wiring pattern area of the printed circuit board is restricted due to the large number of screw fastening parts, and also the large number of boss parts. The shape accuracy of the front side of a plastic case such as a front cover integrally formed with (screw fastening portion) is likely to be deteriorated due to a sink or the like, and it is difficult to obtain a desired appearance quality (appearance quality of a decorative surface).

Further, there is a problem in that the number of screws to be fastened is large and the man-hours for mounting the printed circuit board on the case such as the front cover are increased.

Therefore, the present invention provides a board mounting apparatus and method capable of securing the wiring pattern area of the printed board and improving the appearance quality of the plastic case and reducing the number of steps for mounting the printed board on the case. To do.

[0008]

In order to solve the above-mentioned problems, a board mounting device of the present invention comprises a screw fastening portion for fastening a printed circuit board to the inner surface of a case with a screw, and the screw fastening portion separated from the screw fastening portion. A first contact member that comes into contact with a peripheral portion of the printed circuit board on one surface side; and a second contact member that separates from the screw fastening portion and comes into contact with a peripheral portion of the printed circuit board on the other surface side. The first contact member and the second contact member are respectively provided at positions corresponding to a plurality of adjacent side portions that are adjacent to each other at a predetermined angle in the peripheral portion of the printed circuit board.

With this structure, at least the corners between the adjacent side portions of the printed circuit board are held by the first and second contact members without being screwed, and the number of mounting steps can be reduced. .

Further, in the board mounting device of the present invention, the screw fastening portion is arranged at a position corresponding to an opposite side portion facing the adjacent side portion.

With this configuration, one end side of the printed circuit board in the predetermined direction can be screwed and the other end side can be held by the case, and the wiring pattern area of the printed circuit board can be sufficiently secured, and the vibration and impact can be secured. It is possible to secure the required mounting strength for the above.

Further, in the board mounting apparatus of the present invention, the printed board is provided with a claw portion that abuts against the first abutting member and the second abutting member, respectively. The two contact members form a groove into which the claw portion is inserted, and the claw portion is engaged with the first contact member and the second contact member.

With this configuration, the adjacent side portions of the printed circuit board can be easily engaged with the case, and the mounting work can be facilitated.

Further, in the board mounting apparatus of the present invention, an electronic component that operates in response to an operation input is mounted on the printed circuit board, the screw fastening portion is arranged in the vicinity of the electronic component, and the plurality of claws are provided. The part is provided on the adjacent side part on the side separated from the electronic component.

With this configuration, the operation input applied to the electronic component can be carried by the screw fastening portion, and the required mounting strength against external force can be secured.

The board mounting device further includes the first
The contact member and the second contact member are respectively provided at positions corresponding to a pair of short side portions at both ends in the longitudinal direction of the peripheral portion of the printed circuit board, and the printed circuit board is provided at the short side portions at both ends in the longitudinal direction. Both sides are in contact with the case.

With this structure, both ends in the longitudinal direction of the printed circuit board can be held in the case, and even if the printed circuit board is long, reliable mounting can be performed with a small number of screw fastenings.

On the other hand, according to the board mounting method of the present invention, a screw fastening portion for fastening the printed circuit board to the inner surface of the case with a screw and a peripheral edge portion on one surface side of the printed circuit board separated from the screw fastening portion. A plurality of first abutting members and a plurality of second abutting members that are spaced from the screw fastening portion and abut on a peripheral edge portion on the other surface side of the printed circuit board;
The contact member and the second contact member are provided at positions corresponding to a plurality of adjacent side portions that are adjacent to each other at a predetermined angle in the peripheral portion of the printed circuit board, the screw, and the board. A first side portion of the adjacent side portions of the printed circuit board is brought into contact with the case by using
While guiding the side portion by the case, by moving the printed circuit board in the direction along the first side portion,
The second side portion of the adjacent side portions of the printed circuit board is brought into contact with the first contact member and the second contact member provided at a position corresponding to the second side portion, and then the printed circuit board. Is fastened to the screw fastening portion with the screw, and the printed circuit board is held in the case by the screw fastening portion and the screw, and the first contact member and the second contact member. .

With this structure, at least one corner of the printed circuit board is held by the first and second contact members without being screwed, and the number of mounting steps can be reduced.

In the present invention, a positioning portion for the printed circuit board (which may also have a movement guide function) is provided on the case side so that the printed circuit board can be positioned in the case prior to the screw fastening, and the printed circuit board can be positioned in the board surface direction. The movement in at least one direction can be restricted at a fixed position, and in that case, the positioning portion is preferably arranged near the screw fastening portion.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 are views showing an embodiment of a board mounting apparatus according to the present invention.
IN (DIN is German Industrial Standard) is applied to a car audio device of a deck size.

In the board mounting apparatus of this embodiment, the printed board 20 is fastened to the inner surface 11 side of the plastic case 10 constituting the escutcheon cover on the front side of the deck by a pair (at least one) of screws 31 and 32. is there. The plastic case 10 is, for example, an injection molded product made of a predetermined thermoplastic resin, and has a shape in which the inner surface 11 side is concave as a whole. On the inner surface 11 side of the plastic case 10, a pair of boss-shaped screw fastening portions 12 and 13 to which screws 31 and 32 are screwed are provided so as to project, and a peripheral wall portion 17 which is an outer peripheral portion is further provided. There is. The printed circuit board 2 is provided on the inner circumference of the peripheral wall portion 17.
3 (a plurality) of first contact members 14A, 14B and 14C so as to be close to the short side portion 21 and the short side portion 23 at both ends in the longitudinal direction of 0 and the long side portion 22 at one end in the short side direction. Three
Second contact member 15A, 15B and 15C
And are integrally formed.

As shown in FIGS. 2 and 5, the first abutting members 14A, 14B and 14C are almost the same as the protruding height h1 of the screw fastening portions 12 and 13 from the inner surface 11 (see FIG. 2B). It has the same height and is arranged apart from the screw fastening portions 12 and 13. These first contact members 14A, 14
B and 14C are spaced apart from each other in the circumferential direction of the printed circuit board 20, and are in contact with the peripheral edge portion 20a on one surface side of the printed circuit board 20, respectively. In addition, the second contact member 15
A, 15B and 15C are first contact members 14A, 14A.
A predetermined gap (gap equal to or slightly larger than the plate thickness of the printed circuit board 20) is provided in the direction of the height h1 with respect to B and 14C, and the screw fastening portion 1 is provided.
It is arranged apart from 2 and 13. These second contact members 15A, 15B and 15C are the same as the printed circuit board 2
0 are arranged apart from each other in the circumferential direction and are in contact with the peripheral edge portion 20b on the other surface side of the printed circuit board 20, respectively. And
The first contact members 14A, 14B and 14C and the second contact members 15A, 15B and 15C are on the inner surface 11 side of the plastic case 10, respectively, and the printed circuit board 2
At positions corresponding to the short side portion 21, the long side portion 22 and the short side portion 23 as a plurality of adjacent side portions which are adjacent to each other at a predetermined angle (90 degrees in FIG. 1) among the peripheral portions 20a and 20b of 0. ,
At least one set (first abutting member 14A, 14B or 14)
C and a second contact member 15A, 15B or 15C) are provided respectively.

The short side portion 21, the long side portion 22 and the short side portion 23 of the printed circuit board 20 are respectively provided with the first abutting member 1.
4A, 14B, 14C and second contact members 15A, 15
A plurality of claw portions 21a, 22a, 23 abutting B, 15C
a is provided, and the plurality of claw portions 21a and 22a are provided.
a and 23a are a plurality of slit-shaped lateral holes 17a, 17b and 17 formed in the peripheral wall portion 17 of the plastic case 10.
c is inserted (see FIGS. 3 and 4). here,
The first contact members 14A, 14 of the plastic case 10
B, 14C and second contact members 15A, 15B, 15C
Respectively configure side walls of the lateral holes 17a, 17b, 17c as grooves into which the plurality of claw portions 21a, 22a, 23a are fitted.

The first contact members 14A, 14B, 14
In any one of C, for example, the first contact members 14B and 14C, in addition to forming side wall portions of the lateral holes 17a to 17c, the printed circuit board is located inward of the eaves-shaped portions of the second contact members 15B and 15C, respectively. A pair of parallel ridges 14d and 14e that come into contact with the peripheral edge portion 20a of the ridge 20 are provided, and these ridges 14d and 14e are formed to have the protrusion height h1.

The second contact members 15A, 15B, 15
C is formed in a canopy shape that extends from the side walls of the lateral holes 17a, 17b, 17c and projects inwardly from the peripheral wall portion 17. The second contact members 15A, 15B, 15C allow the printed circuit board 20 to be made of plastic. It is possible to prevent the case 10 from floating in a direction away from the inner surface 11.

On the other hand, the screw fastening portion 12 of the plastic case 10 is on the inner surface 11 side and faces the short side portion 21, the long side portion 22 and the short side portion 23 of the peripheral edge portions 20a and 20b of the printed circuit board 20. It is arranged at a position corresponding to the long side portion 24 as the facing side portion. Also, the printed circuit board 2
A plurality of operation knobs (not shown) and a liquid crystal display 35 are mounted on the display unit 0, and the plastic case 10 is formed with knob through holes 18a and 18b through which the operation knobs penetrate and a display window hole 18c. The operation knob is a printed circuit board 2 as an electronic component that operates according to an operation input.
It is implemented in 0. And in this Embodiment, the screw fastening part 13 is arrange | positioned in the vicinity of the electronic component,
Plural claw portions 21a, 22a, 23a of the printed circuit board 20
The short side portion 21 and the long side portion 2 on the side away from the electronic component
2 and the short side portion 23.

Further, the peripheral portion 20a of the printed circuit board 20,
A pair of short side portions 2 located at both ends in the longitudinal direction of 20b.
The plurality of claw portions 21a and 23a provided on the first and the second side 23b are relatively bent (elastically deformed) so that the printed circuit board 20 and the plastic case 10 are separated from each other at the central portion in the longitudinal direction through the knob through holes 18a and 18b. By causing it to be inserted into the lateral holes 17a, 17c.

Further, the plastic case 10 is provided with positioning portions 33 and 34 as positioning pins, for example, which regulate the movement of the printed board 20 in at least one direction in the board surface direction at a fixed position. A circular positioning hole 26a corresponding to the shape of the positioning pin 26 and an oval guide hole 26b are formed in 20. The mounting hole of the screw 32 is formed in a long hole shape continuous to the guide hole 26b (details are not shown), and the screw 32 fastens the printed circuit board 20 to the screw fastening portion 13 via a washer 37. is doing. The washer 37 may also serve as a component for ground connection, for example.

Next, a board mounting method of the board mounting apparatus will be described.

As described above, in the present embodiment,
The printed circuit board 20 is fastened to the inner surface side of the plastic case 10 with the screws 31 and 32. Prior to the screw fastening, the plastic case 1 having the above-described configuration is provided in advance.
Prepare 0. That is, the screw fastening portion 1 to which the screw is coupled
2, 13 and a plurality of first abutting members 14A, 14B, 14C which are spaced from the screw fastening portions 12, 13 and abut on the peripheral portion 20a on the one surface side of the printed circuit board 20, and from the screw fastening portions 12, 13. A plurality of second contact members 15A, 1A that are spaced apart and contact the peripheral portion 20b on the other surface side of the printed circuit board 20.
5B and 15C on the inner surface 11 side thereof, a plurality of short side portions 21, long side portions 22 and short side portions 2 of the peripheral portions 20a and 20b of the printed circuit board 20 which are adjacent to each other at a predetermined angle.
The plastic cases 10 provided at the positions corresponding to 3 are prepared.

Next, the inner surface 1 of the plastic case 10
The printed circuit board 20 is disposed on the first side, and the printed circuit board 20 and the plastic case 10 are opposed to each other so that the longitudinal center portions of the printed circuit board 20 and the plastic case 10 are separated from each other through the knob through holes 18a and 18b of the plastic case 10. Bending (elastic deformation) is caused. As a result, the claw portions 21a and 23a of the pair of short side portions 21 and 23 are made to pass over the front side (the lower side in FIG. 1B) of the second contact members 15A and 15C, and the short side portions of the printed circuit board 20. Of the long side portion 22, the long side portion 22 and the short side portion 23, the short side portions 21 and 23 as the first side portion are
The inner surfaces of the second contact members 15 </ b> A and 15 </ b> C and the peripheral wall portion 17 that are close to the first and second contact members are brought into contact with each other.

At this time, since the printed circuit board 20 is displaced with respect to the plastic case 10 toward the lower side in FIG. 1A in the plate surface direction, the claw portion 21 of the pair of short side portions 21 and 23 is formed.
The a and 23a are not inserted into the lateral holes 17a and 17c.

Next, the short side portions 21 and 23 at both ends in the longitudinal direction of the printed circuit board 20 are printed while being guided by the inner surfaces of the second abutting members 15A and 15C and the peripheral wall portion 17 which are close to the short side portions 21 and 23. The substrate 20 is provided with the short sides 21,
(And the left and right inner side surfaces of the plastic case 10 facing this). Due to this movement, the short side portion 21, the long side portion 22, and the short side portion 2 of the printed circuit board 20.
3, the plurality of claw portions 22 of the long side portion 22 as the second side portion
The a is inserted into the plurality of lateral holes 17b provided at the positions corresponding to these, and is brought into contact with the first abutting member 14B and the second abutting member 15B which are the side walls thereof. At the time of this insertion, the claw portions 21a and 23a of the pair of short side portions 21 and 23 are aligned with the lateral holes 17a and 17c by the movement of the printed circuit board 20,
The positioning portions 33 and 34 are fitted into the positioning holes 26a and the guide holes 26b while being inserted into the lateral holes 17a and 17c.

In this state, the printed circuit board 20 can be finely rotated around the positioning portion 33, and the tilt of the liquid crystal display 35 with respect to the plastic case 10 (the tilt with respect to the window frame) can be finely adjusted.

Next, the printed circuit board 20 is attached to the screw fastening portion 1
When fastened to the screws 2 and 13 with the screws 31 and 32, a plurality of sets of first abutting members serving as the side walls of the pair of screw fastening portions 12 and 13 and the screws 31 and 32 and the lateral holes 17a, 17b, and 17c separated from them. The printed circuit board 20 is held in the plastic case 10 by 14A, 14B, 14C and the second contact members 15A, 15B, 15C.

As described above, in the present embodiment, at least one corner portion of the printed circuit board 20, for example, the corner portion CP1 between the short side portion 21 and the long side portion 22, the long side portion 22 and the short side portion 23. The vicinity of the corner portion CP2 between them is held by the plastic case 10 without screwing, and the number of mounting steps is significantly reduced. Further, the short side portion 21, the long side portion 22 and the short side portion 23 of the printed circuit board 20 can be easily engaged with the plastic case 10 by the respective claw portions 21a, 22a and 23a, which facilitates the mounting work. Can be achieved.

Further, since the screw fastening portion 12 is arranged at a position corresponding to the long side portion 24 of the printed circuit board 20,
One end of the printed circuit board 20 can be screwed in the predetermined direction and the other end can be held in the plastic case 10. Moreover, since the short side portions 21 and the short side portions 23 at both ends in the longitudinal direction of the printed circuit board 20 can be held in the plastic case 10, even if the longitudinal direction of the printed circuit board 20 is relatively long, the number of screws to be fastened can be ensured. Can be installed easily. As a result, the required mounting strength against vibration and shock of the car audio device can be secured. Also,
Since the stress due to the operation input applied to the printed circuit board 20 can be carried by the screw fastening portion 13 near the knob, the required mounting strength against external force can be secured.

The short side portions 21 and 23 at both longitudinal ends of the printed circuit board 20 are brought into contact with the plastic case 10 and guided by the plastic case 10, while the printed circuit board 20 is moved in the direction along the short side portions 21 and 23. By moving the claw portion 2 of the long side portion 22 of the printed circuit board 20.
2a is engaged with the corresponding lateral hole 17b, and the claw portions 21a and 23a of the short side portions 21 and 23 are connected to the lateral hole 17b.
Since the printed circuit board 20 is screw-fastened to the screw fastening portions 12 and 13 after being engaged with the printed circuit board 20.
Since at least one of the corners CP1 and CP2 of the above will be held in the plastic case 10 without being screwed, it does not take time to fit the printed circuit board 20, and the number of mounting steps for screwing is not required. Will be reduced.

Further, since the printed circuit board 20 can be positioned with respect to the plastic case 10 by the positioning portions 33 and 34 prior to the screw fastening, the screws 31 and 32 can be easily mounted, and the positioning portions 33 and 34 can be attached to the screw fastening portion 1.
Since it is arranged in the vicinity of 2 and 13, the mounting strength can be further increased.

In the above-described embodiment, the printed circuit board 20 is slightly bent while guiding the short side portions 21 and 23 at both longitudinal ends of the printed circuit board 20 to the inner circumference of the peripheral wall portion 17 of the plastic case 10. Short side 2
Although it was configured to move in the direction along 1 and 23 and to be fitted, it is not always necessary to bend the printed board, and one long side of the printed board is fitted into the groove first and guided. Then, it is also possible to perform screw fastening by fitting one short side portion into the groove.

[0043]

According to the present invention, at least one corner of a printed circuit board is not screwed to the first and second corners.
It can be held in the plastic case through the contact member, and the number of screw fastenings can be reduced, so that the number of steps for attaching the printed circuit board to the case can be significantly reduced.

[Brief description of drawings]

FIG. 1A is a rear view of a case and a printed circuit board showing an embodiment of a board mounting device according to the present invention, and FIG. 1B is a sectional view taken along line B1-B1 of FIG.

2A is a partially enlarged view of FIG. 1A showing one side of a case and a printed circuit board according to an embodiment of the present invention. FIG. 2B is one end of a case and printed circuit board according to the embodiment of the present invention. 1B is a partially enlarged view showing the side of FIG.

FIG. 3 is a partial cross-sectional view showing a case and an engaging portion of a claw portion of a printed circuit board showing an embodiment of a board mounting device according to the present invention.

FIG. 4 is a left side view of the case and the printed circuit board shown in FIG.

FIG. 5 (a) is a partially enlarged view of FIG. 1 (a) showing the other end of the case and the printed circuit board according to the embodiment of the present invention. (B) The case and the printed circuit board according to the embodiment of the present invention. A partially enlarged view of FIG. 1B showing the other end side

FIG. 6 is a rear view of a case and a printed circuit board showing a conventional board mounting device.

[Explanation of symbols]

10 plastic case (case) 11 Inside 12, 13 Screw fastening part 14A, 14B, 14C First contact member 15A, 15B, 15C Second contact member 17 Peripheral wall 17a, 17b, 17c Side hole (groove) 18a, 18b through hole 18c display window hole 20 printed circuit boards 20a One side peripheral edge 20b The peripheral portion on the other surface side 21 Short side (adjacent side, first side) 22 Long side (adjacent side, second side) 23 Short side (adjacent side, first side) 21a, 22a, 23a Claws 24 Long side (opposite side) 26a Positioning hole 26b Guide hole 33, 34 Positioning unit 35 Liquid Crystal Display

Claims (6)

[Claims] 1. A screw fastening portion that fastens a printed circuit board to the inner surface of a case with a screw, and a first abutment member that is spaced from the screw fastening portion and abuts on a peripheral portion of the printed circuit board on one surface side. A second contact member which is separated from the screw fastening portion and abuts on a peripheral edge portion on the other surface side of the printed circuit board,
The first contact member and the second contact member are respectively provided at positions corresponding to a plurality of adjacent side portions that are adjacent to each other at a predetermined angle in the peripheral portion of the printed circuit board. Mounting device. 2. The board mounting device according to claim 1, wherein the screw fastening portion is arranged at a position corresponding to an opposite side portion facing the adjacent side portion. 3. The printed circuit board is provided with a claw portion that comes into contact with the first contact member and the second contact member, respectively, and the claw portion is provided by the first contact member and the second contact member. The board mounting device according to claim 1 or 2, wherein a groove into which the portion is inserted is formed, and the claw portion is engaged with the first contact member and the second contact member. 4. An electronic component that operates according to an operation input is mounted on the printed circuit board, the screw fastening portion is disposed in the vicinity of the electronic component, and the plurality of claw portions are separated from the electronic component. The board mounting apparatus according to claim 3, wherein the board mounting apparatus is provided on the side adjacent to the side. 5. The first abutting member and the second abutting member are respectively provided at positions corresponding to a pair of short side portions at both ends in a longitudinal direction of a peripheral portion of the printed circuit board, and the printed circuit board is The board mounting device according to claim 1, wherein the case is in contact with both sides of the short sides at both ends in the longitudinal direction, respectively. 6. A screw fastening portion for fastening the printed circuit board to the inner surface of the case with a screw, and a plurality of first abutting members spaced apart from the screw fastening portion and abutting on a peripheral edge portion on one surface side of the printed circuit board. A plurality of second abutting members that are spaced from the screw fastening portion and abut on a peripheral portion on the other surface side of the printed circuit board, wherein the first abutting member and the second abutting member are the aforesaid. Using the case, the screw, and the board that are respectively provided at positions corresponding to a plurality of adjacent side portions that are adjacent to each other at a predetermined angle in the peripheral portion of the printed circuit board, The first side portion is brought into contact with the case, and the printed circuit board is moved in the direction along the first side portion while guiding the first side portion by the case, thereby adjoining the printed circuit board. The second side of the side The first contact member and the second contact member provided at a position corresponding to the second side portion of the printed circuit board, the printed circuit board is fastened to the screw fastening portion with the screw, Is attached to the case by the screw fastening portion and the screw, and the first contact member and the second contact member.