JPH0715107A - Multistage mounting method for printed board - Google Patents

Abstract

PURPOSE:To make an exclusive area for fixation small when mounting a plurality of printed boards and besides, enable the downsizing of an electronic apparatus. CONSTITUTION:All printed boards 10 are fixed by tightening screws 13 to insert screw seats 11 through the uppermost printed board 10 after mounting the printed boards 10 in multistage while securing specified intervals by means of spacers 12. Moreover, since an insert screw seat 11, a spacer 12, and a screw 13 are conductive, the earth electrodes 10c and 10d made in each printed board 10 become conductive at fixation of the printed board 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage mounting method for a printed circuit board, in which a plurality of printed circuit boards on which electronic components are mounted are fixed and held in a laminated state and mounted on an electronic device.

[0002]

2. Description of the Related Art Conventionally, in the electronic component mounting technology, when a plurality of printed circuit boards on which electronic components are mounted are incorporated into an electronic device, in order to fix each printed circuit board, for example, as shown in FIGS. As shown in FIG. 10, a method of fixing using a guide or a spacer is adopted.

The method shown in FIG. 6 is a mounting method used for a large-sized board component, and the side surfaces of the printed board 1 are guided along a guide hole 2a formed in the facing surface of a pair of guide rails 2 facing each other. It is a method of inserting and fixing. In this mounting method, the printed board 1 may be inserted in any order.

Further, the method shown in FIGS. 7 and 8 is such that each printed circuit board 1 is formed so as to project or be fixed and held on a base (not shown) of an electronic device for fixing screws with different heights. In this method, the printed circuit board 1 is fixed to the insert screw seat 3 by sequentially tightening the screws 4 from the lower layer of the height to the insert fitting 3a of the insert screw seat 3. In this fixing method, as shown in FIG. 8, the insert screw seat 3 for fixing the printed circuit board 1 mounted on the upper layer to the printed circuit board 1 mounted on the lower layer first is used.
A notch 1a is formed to escape.

Further, as shown in FIG. 9, the printed circuit board 1
In order to eliminate the area forming the notch 1a, the spacer 5a has a concave cross-sectional shape and a screw thread is formed on the inlet side of the opening, and a spacer 5b protruding from the bottom of the spacer 5a. The threaded spacer 5 may be used to fix the printed circuit board 1. That is, after fixing the lowermost printed circuit board 1 by tightening the screw part 5b of the threaded spacer 5 to the insert metal fitting 3a of the insert screw seat 3, the printed circuit board 1 is fixed by the spacer part 5a.
While maintaining the space between them, the printed circuit board 1 is fixed sequentially from the lower layer by tightening the screw part 5b to the spacer part 5a, and finally the uppermost printed circuit board 1 is fixed by tightening the screw 4 to the spacer part 5a. Is the way to do it. This fixing method is difficult to fix because the lower threaded spacer 5 is tightened or loosened when the upper threaded spacer 5 or screw 4 is tightened or loosened. Not adopted above.

Further, as shown in FIG. 10, while maintaining the space between the printed circuit boards 1 by the cylindrical spacer 6, a long screw 7 is passed through the cylindrical spacer 6 to insert the insert screw seat 3 A method of fixing the printed circuit board 1 by tightening it on the insert metal fitting 3a may be adopted. In this fixing method, since the cylindrical spacer 6 is not fixed, it is necessary to tighten the screw 7 to the insert fitting 3a to hold the spacer 6 until the spacer 6 is not displaced. For this reason, the printed circuit board 1
The workability of fixing is poor, and it cannot be fixed unless it is the end of the printed circuit board 1 that can hold the cylindrical spacer 6.

As described above, there are various methods for fixing the printed circuit board 1, but at present, as a method for fixing the printed circuit board 1 to be incorporated in the electronic equipment, the method shown in FIGS.
The fixing method shown in is often used.

[0008]

However, in the fixing method shown in FIGS. 7 and 8, the notch portion for escaping the insert screw seat 3 for fixing the printed circuit board 1 mounted on the upper layer to the printed circuit board 1 on the lower layer is provided. 1a needs to be formed, and the upper printed circuit board 1 needs an area 1b for tightening the screw 4 and the lower printed circuit board 1 needs an area 1c for tightening the screw 4. In addition, the notch 1a and the areas 1b and 1c also increase as the number of printed circuit boards 1 to be fixed increases. The large area for fixing the printed circuit board 1, such as the cutouts 1a and the areas 1b and 1c, becomes an obstacle in downsizing the printed circuit board 1 and makes it difficult to reduce the size and weight of the electronic device. There is a problem of becoming.

The present invention has been made in view of the above circumstances, and when mounting a plurality of printed circuit boards, a dedicated area for fixing is small, and the size and weight of the electronic device can be reduced. It is an object of the present invention to provide a multi-stage mounting method for substrates.

[0010]

In order to achieve the above object, the present invention provides a method of mounting a plurality of printed circuit boards on an electronic device in a multi-step manner, wherein a fixed shaft for fixing the printed circuit board and a fixed shaft for fixing the printed circuit board are provided. Having a spacer member that fits with the peripheral wall and secures and positions an interval between the printed circuit boards, and a fastening member for fixing the printed circuit board, and after mounting the printed circuit board at a predetermined interval by the spacer member in multiple stages, All the printed boards are fixed by fastening the fastening member to the fixed shaft via the printed board of the uppermost layer.

Further, the present invention is characterized in that the fixed shaft, the spacer member and the fastening member are electrically conductive and electrically connect a plurality of printed circuit boards.

[0012]

Since the present invention is configured as described above, the printed circuit board is mounted in a stable state, and the dedicated area for fixing the printed circuit board is small, so that the area of the printed circuit board can be effectively used and electronic Small equipment
Weight reduction is possible.

Further, according to the present invention, since the fixed shaft, the spacer member and the fastening member are electrically conductive, the ground potential can be conducted between the printed boards at the same time when the printed boards are fixed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a multi-stage mounting method for a printed circuit board according to a first embodiment of the present invention, FIG. 2 is a diagram showing the mounting process thereof, and FIG. 3 is a printed circuit board mounting according to the first embodiment of the present invention. 4 is a sectional view after mounting the printed circuit board according to the second embodiment of the present invention, and FIG. 5 is a sectional view after mounting the printed circuit board according to the third embodiment of the present invention.

In FIG. 1, reference numeral 10 is a printed circuit board on which electronic components are mounted. The lower printed circuit board 10 is integrally molded with the base of the electronic equipment and is provided with an insert metal fitting 11a on the upper side.
The insertion hole 10a for inserting into the insert screw seat 11 having the insertion holes 10a (see FIGS. 3A and 3B) is smaller than the diameter of the insertion hole 10a in the upper printed circuit board 11. Fixing holes 10b for fixing each are formed. Ground electrodes 10c and 10d are formed on the front and back surfaces of the printed circuit board 10 around the insertion hole 10a and the fixing hole 10b, respectively. Further, the insert screw seat 11 is made of plastic, and the surface thereof is nickel-plated or coated with conductive paint to have conductivity.

Numeral 12 is a ring-shaped spacer that secures a space between the printed circuit boards 10, and is made of plastic or metal plated with nickel and has conductivity. This spacer 11 is fitted into the outer peripheral wall of the insert screw seat 11 and press-fitted into the insert screw seat 11, and holds the printed circuit board 10 inserted into the insert screw seat 11 through the insertion hole 10a between the insert screw seat 11 and the printed circuit board 10. Temporarily fix it. spacer
The height of 12 is set to the interval of the printed circuit board 10 which is required for design or safety, and the height of the insert screw seat 11 is such that the spacer 12 holds the printed circuit board 10 and the insert screw seat 11 The upper surface of the spacer 12 and the upper surface of the spacer 12 are set to be flush with each other.

Reference numeral 13 is a screw for fixing the printed board 10 to the insert screw seat 11, and the screw 10 is fastened to the insert metal fitting 11a through the fixing hole 10b formed in the upper printed board 10. Thus, the entire printed circuit board 10 to be mounted is fixed to the insert screw seat 11.

Next, the mounting process of the printed circuit board 10 will be described.

First, the lower printed circuit board 10 is inserted into the insertion hole 10a.
It is inserted into the insert screw seat 11 via the and is placed on the step portion of the insert screw seat 11. (See FIG. 2 (a)).

After the lower-layer printed circuit board 10 is inserted, the spacer 12 is fitted and press-fitted into the insert screw seat 11, and the inserted printed circuit board 10 is sandwiched between the insert screw seat 11 and the stepped portion for positioning and temporary positioning. Fix it. (See FIG. 2 (b)).

After the lower printed circuit board 10 is temporarily fixed, the ground electrode 10d formed on the upper printed circuit board 10 is placed on the surface formed by the upper surface of the insert screw seat 11 and the upper surface of the spacer 12. Set. (See FIG. 2 (c)).

Finally, the screw 13 is inserted through the fixing hole 10b formed in the upper printed circuit board 10 into the insert fitting 11a.
Then, the upper and lower printed circuit boards 10 are fixed to the insert screw seat 11. At this time, screw 13, insert metal fitting 11a
Since the insert screw seat 11 and the spacer 12 are all conductive, the ground electrodes 10c and 10d of the upper and lower printed circuit boards 10 are brought into conduction. In this way, the insert screw seat 11 functions as a fixed shaft, and by fastening the screw 13 to the insert screw seat 11, the entire printed circuit board 10 is fixed to the insert screw seat 11. (Fig. 2
(See (d)).

FIG. 3 shows a cross section of the printed circuit board 10 mounted based on the mounting process described above. FIG. 3 (a) shows an example in which two printed circuit boards 10 are fixed and mounted in two stages. Also, FIG. 3B shows an example in which three or more printed circuit boards 10, for example, four printed circuit boards 10 are fixed and mounted in four stages.

By the way, as shown in FIGS. 7 and 8, the area required for fixing the conventional printed circuit board 1 is the notch 1a for escaping the insert screw seat 3 and the areas 1b, 1c for tightening the screw 4. Is. On the other hand, the printed circuit board of the present invention
The area required for fixing 10 is an area corresponding to the ground electrodes 10d, 10c formed on the upper and lower printed circuit boards 10, respectively, as shown in FIG. 1, and the conventional tightening area 1b, If 1c and the ground electrodes 10d, 10c have the same area, the area of the cutout 1a can be reduced as compared with the conventional fixing method. In addition, since this reduced area occurs at one fixed location, the amount of reduction increases as the number of printed circuit boards 10 increases and the number of fixed locations increases.

Therefore, according to the fixing method of the present invention,
Since a dedicated area for fixing the printed circuit board 10 is small, the area of the printed circuit board 10 can be effectively used, and the electronic device can be easily reduced in size and weight.

Next, FIG. 4 shows a second embodiment.
4A shows an example in which two printed circuit boards 10 are mounted in two stages, and FIG. 4B shows an example in which three or more printed circuit boards 10 are mounted, for example, four printed circuit boards 10 in four stages. Is shown.

In the fixing method according to the second embodiment, as shown in FIG. 4, the insert screw seat 11 of the first embodiment shown in FIGS. 1 to 3 is integrally molded with the base of the electronic equipment to form a recess in the upper portion. By changing the shape of the boss 15 with a special insert 16 made of metal that fits and press fits into the recess of this boss 15, the spacer 12 is fitted and press fit into the outer peripheral wall of the special insert 16 The 10 is positioned and temporarily fixed, and the fixing method is the same as in the first embodiment. In the fixing method according to the second embodiment, the insert metal fitting 11a is not required by forming the screw hole for fastening the screw 13 at one end of the special insert 16, so that the special insert 16 is formed on the printed circuit board 10. The size of the insertion hole 10a can be reduced, and the dedicated area for fixing the printed circuit board 10 can be further reduced. Also, the boss 15 is formed so as to have conductivity like the insert screw seat 11 of the first embodiment, and when the printed circuit board 10 is fixed, the ground electrodes 10c, 10d of the printed circuit board 10 are in a conductive state. Become. In addition,
The height of the special insert 16 is set according to the number of printed circuit boards 10 to be mounted.

Further, FIG. 5 shows a third embodiment, FIG. 5 (a) shows an example in which two printed circuit boards 10 are mounted in two stages, and FIG. 5 (b) shows three or more. Printed circuit board 10,
For example, an example in which four printed circuit boards 10 are mounted in four stages is shown.

In the fixing method according to the third embodiment, the shapes of the insert screw seat 11, the spacer 12 and the screw 13 of the first embodiment shown in FIGS. 1 to 3 are changed.

That is, the insert screw seat 17 has a height for supporting the printed circuit board 10 of the lowermost layer and is integrally molded with the base of the electronic device, and the recess 17a is formed on the upper surface side and the bottom of the recess 17a is formed. Has a shape provided with an insert fitting 17b. In addition, the spacer 18 has a ring shape and is a main body portion that secures a predetermined space between the printed circuit boards 10.
18a and a recess 18b formed on the upper surface side of the main body 18a
And a protruding portion 18c protruding from the lower surface side of the main body portion 18a, and has a function of maintaining the distance between the printed circuit boards 10 and a function as a fixed shaft for fixing the printed circuit boards 10. In addition, insert screw seat 17 and spacer
18 is the insert screw seat 11 or spacer of the first embodiment
It is formed to have conductivity by the same forming method as 12.

To mount the printed circuit board 10 using the insert screw seat 17 and the spacer 18 having the above-described shapes, first, the spacer 18 was fitted and press-fitted into the insertion hole 10a of the lower printed circuit board 10 to be mounted on the printed circuit board 10. After that, the protrusion 18c of the spacer 18 is fitted into and fixed to the recess 17a of the insert screw seat 17. By this fitting and fixing, the spacer 18 positions the printed circuit board 10 until the fixing is completed. At this time, the lower-layer printed circuit board 10 is sandwiched between the lower surface of the main body portion 18a of the spacer 18 and the upper surface of the insert screw seat 17. Then, the upper printed circuit board 10 is placed on the upper surface of the spacer 18, and the long screw 19 is fastened to the insert metal fitting 17b of the insert screw seat 17 through the fixing hole 10b formed in the upper printed circuit board 10 and the spacer 18. Then, the main body portion 18a of the spacer 18 secures a predetermined space between the upper and lower printed circuit boards 10 to fix the upper and lower printed circuit boards 10. When the printed circuit board 10 is fixed, the ground electrodes 10c and 10d formed on each printed circuit board 10 are brought into conduction as in the first embodiment. (See FIG. 5 (a)).

When mounting three or more printed circuit boards 10, the protruding portion 18c of the spacer 18 attached to the printed circuit board 10 in the lowermost layer is replaced with the recessed portion 17a of the insert screw seat 17.
Printed circuit board 10 to be mounted next
The protruding portion 18c of the spacer 18 attached to is fitted into the concave portion 18b of the spacer 18 in the lowermost layer and positioned. After sequentially fitting and positioning the printed circuit board 10 of the intermediate layer, finally, the long screw 19 is inserted into the insert screw seat 17 through the fixing hole 10b and the spacer 18 formed in the printed circuit board 10 of the uppermost layer. Fasten to the insert metal fitting 17b. When all the printed circuit boards 10 are fixed by fastening the long screws 19 with a predetermined space between the printed circuit boards 10, the printed circuit boards 10 are formed on each printed circuit board 10 as in the first embodiment. The earth electrodes 10c and 10d that are present are in a conductive state.
(See FIG. 5 (b)).

In the above embodiment, the insert screw seat is used.
Although the surface of 11 is coated with nickel or coated with conductive paint so that the insert screw seat 11 has conductivity, the present invention is not limited to this. For example, a conductive filler made of carbon fiber pieces may be used as the insert screw seat 11. May be mixed with the above to achieve conductivity.

In the above embodiment, the spacer 12 is made of plastic or metal plated with nickel so as to have conductivity. However, the present invention is not limited to this, and the spacer 12 is formed of a spring so as to have conductivity. You may do it.

In the above embodiment, the spacer 18 is fitted and press-fitted into the printed circuit board 10 to be mounted.
Furthermore, after mounting, it may be fixed by soldering, and by fixing by soldering, workability in the assembly process can be improved.

Further, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0038]

As described in detail above, according to the multi-stage mounting method for a printed circuit board of the present invention, the printed circuit board can be mounted in a stable state and the dedicated area for fixing the printed circuit board is reduced. Therefore, the area of the printed circuit board can be effectively used, and the electronic device can be reduced in size and weight.

Further, since the fixed shaft, the spacer member and the fastening member are electrically conductive, the earth potential can be conducted between the printed boards when the printed boards are fixed.

[Brief description of drawings]

FIG. 1 is a diagram showing a multi-stage mounting method for a printed circuit board according to a first embodiment of the present invention.

2A and 2B are diagrams showing a mounting step of a multi-stage mounting method for a printed circuit board according to the first embodiment of the present invention, FIG. 2A is a diagram showing insertion of the printed circuit board, and FIG. FIG. 2 is a diagram showing press fitting, FIG. 2 (c) is a diagram showing setting of the uppermost printed circuit board, and FIG. 2 (d) is a diagram showing fixing of the printed circuit board.

FIG. 3 is a cross-sectional view after mounting the printed circuit board according to the first embodiment of the present invention. FIG. 3 (a) is an example in which two printed circuit boards are mounted in two stages, and FIG. 3 (b) is four. It is a figure which shows the example which mounted the printed circuit board of 4 in four steps.

FIG. 4 is a cross-sectional view after mounting a printed circuit board according to a second embodiment of the present invention. FIG. 4 (a) is an example in which two printed circuit boards are mounted in two stages, and FIG. 4 (b) is four. It is a figure which shows the example which mounted the printed circuit board of 4 in four steps.

FIG. 5 is a cross-sectional view after mounting a printed circuit board according to a third embodiment of the present invention. FIG. 5 (a) is an example in which two printed circuit boards are mounted in two stages, and FIG. 5 (b) is four. It is a figure which shows the example which mounted the printed circuit board of 4 in four steps.

FIG. 6 is a diagram showing a first conventional printed circuit board mounting example.

FIG. 7 is a diagram showing a second conventional printed circuit board mounting example.

FIG. 8 is a diagram showing details of a second conventional printed circuit board mounting example.

FIG. 9 is a diagram showing a third conventional printed circuit board mounting example.

FIG. 10 is a diagram showing a fourth conventional printed circuit board mounting example.

[Explanation of symbols]

 10 ... Printed circuit board 11 ... Insert screw seat (fixed shaft) 12 ... Spacer (spacer member) 13 ... Screw (fastening member) 15 ... Boss (fixed shaft) 16 ... Special insert (fixed shaft) 17 ... Insert screw seat (fixed shaft) ) 18 ... Spacer (fixed shaft, spacer member) 19 ... Long screw (fastening member)

Claims (2)

[Claims] 1. A method of mounting a plurality of printed circuit boards on an electronic device in a multi-stage manner, wherein a fixed shaft for fixing a printed circuit board and a peripheral wall of the fixed shaft are fitted together, and a space between the printed circuit boards is secured and positioned. Having a spacer member and a fastening member for fixing the printed circuit board, after mounting the printed circuit board in multiple stages with a predetermined spacing secured by the spacer member, the fastening member is fixed to the fixed shaft through the printed circuit board of the uppermost layer. A multi-stage mounting method for a printed circuit board, wherein all printed circuit boards are fixed by fastening. 2. The multi-stage mounting method for a printed circuit board according to claim 1, wherein the fixed shaft, the spacer member and the fastening member are electrically conductive to electrically connect the plurality of printed circuit boards.