JPH0617348Y2 - Spacing structure - Google Patents

Description

[Detailed Description of the Device] Outline With respect to a space holding structure for holding a fixed space between a plurality of printed wiring boards and electronic components in a hierarchical mounting, the fixed space between the printed wiring boards and electronic parts can be easily set, In order to improve its assembling workability, in a space holding structure that holds a fixed space when hierarchically mounting a plurality of printed wiring boards and electronic components, the cross section is semicircular and tilted in one direction to the outer periphery. Two spacing bars having screw-shaped locking claws, holes between the locking claws, and tapped grooves on the inner circumference of the cross section are provided so that the directions of the locking claws are opposite to each other. So that the printed wiring board is held from the front and back by the locking claws of the two spacing rods, and the fixing pin is inserted into the hole of the spacing rod. Integrated into a cylinder on the outer circumference of both ends of the two spacing bars. It is configured by closely fixing the members.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space holding structure that holds a fixed space between a plurality of printed wiring boards and electronic components that are hierarchically mounted.

With the recent rapid development of electronic devices, there has been an increasing demand for a high-density mounting structure for a printed wiring board in which electronic components such as ICs and LSIs are mounted on the printed wiring board at a high density.
Therefore, the mounted parts on the printed wiring board are
Type ICs have been converted to surface mount types such as flat package type or chip carrier type. In addition to such a high-density mounting structure for a printed wiring board, a hierarchical mounting is used in which a plurality of printed wiring boards are stacked at a certain interval with the miniaturization of electronic components and the increasing density of electronic devices. Things are also becoming very common.

For this reason, it is desired that hierarchical mounting of printed wiring boards and electronic components can be achieved at low cost and the assembling work can be easily performed.

2. Description of the Related Art FIG. 4 is a block diagram of a conventional spacing structure.

Reference numeral 10 is a printed wiring board, and reference numerals 42, 44, and 46 are interval bolts made of metal such as iron, and a female screw portion 48 is provided on the head portion thereof. Multiple printed wiring boards 1
When 0 is hierarchically mounted at a certain fixed interval, the interval bolts 42, 44 and 46 are used as the interval holding members. The male threads 50 of the spacing bolts 42, 44, and 46 are inserted into the mounting holes of the printed wiring board 10, and the male threads 50 of the spacing bolt 46 are inserted into the female threads 48 of the spacing bolt 44 and the spacing bolt 44. The threaded portion 50 is screwed into the female threaded portion (not shown) of the spacing bolt 42 to fix them. Also,
When the intervals between the respective printed wiring boards 10 are made different, interval bolts having different lengths are used.

In this way, the number and type of the spacing bolts are determined and used according to the number of the printed wiring boards 10 and the respective fixed spacings.

There is also a structure in which a spacing plate (not shown) is used instead of such spacing bolts.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the spacing bolt used in the conventional spacing holding structure as described above, the length of the head of the spacing bolt is fixed, and the spacing between each printed wiring board is set to different dimensions. When setting, it is necessary to use gap bolts having different lengths, so it is necessary to prepare many types of gap bolts having different lengths.

Further, since the male thread portion is screwed into the female thread portion between the plurality of spacing bolts to couple the spacing bolts together, there is a problem that the assembly takes time and the assembly cost is high.

The present invention has been made in view of the above points, and an object of the present invention is to set a fixed interval of a printed wiring board or an electronic component easily and improve an assembly workability thereof. It is to provide a retaining structure.

Means for Solving the Problems In a space holding structure that holds a fixed space when a plurality of printed wiring boards 10 and electronic components 12 are hierarchically mounted,
It has a semicircular cross section and has screw-shaped locking claws 14 tilted in one direction on its outer circumference, holes 16 are provided between the locking claws 14, and tap grooves 18 are provided on the inner circumference of the cross section. The two spacing bars 20 are inserted into the round holes 22 of the printed wiring board 10 so that the locking claws 14 of the two spacing bars 20 face each other, and the locking claws 14 of the two spacing bars 20 are used to print the wiring. The board 10 is held from the front and back.

Then, the fixing pin 24 is inserted into the hole 16 of the spacing rod 20 to integrate the two spacing rods 20, and the cylindrical members 26 are tightly fixed to the outer peripheries of both ends of the two spacing rods 20.

Operation According to the present invention, the plurality of printed wiring boards 10 are provided with the locking claws having a roughly spiral shape by the two spacing bars 20.
The size of the fixed interval of the electronic component 12 can be easily set.
By the two spacing bars 20 fixed by the fixing pin 24,
Since the space between the plurality of printed wiring boards 10 is maintained, the assembling work can be easily performed. Also, two spacing bars 2
The spacing bars 20 can be directly fixed to the support member 32 or the electronic component 12 by using the screws 28 or the like by the tap grooves 18 at both ends of 0.

Embodiments Hereinafter, the space keeping structure of the present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a diagram showing an embodiment of a gap maintaining structure according to the present invention, and FIG.
FIG. 3 is a view showing another embodiment of the spacing holding structure according to the present invention, and FIG. 3 is a partially enlarged view of the spacing bar of the present invention.

In FIG. 1, 10 is a printed wiring board, 22 is a round hole provided in the printed wiring board 10, 12 is an electronic component, 20 is a spacing bar, 24 is a fixing pin, 26 is a cylindrical member, 28 is a screw, and 32 is a support. It is a member. As best shown in FIG. 3, the spacing bar 20 is provided with thread-like locking claws 14 tilted in one direction on the outer periphery of the semicircular cross section, and the locking claws 14 are respectively provided. A plurality of holes 16 are provided at equal intervals. The spacing bar 20 is made of resin or the like. A tap groove 18 is provided inside the cross section of the spacing bar 20.

When the printed wiring board 10 or the electronic components 12 are hierarchically mounted at a fixed spacing, the two spacing rods 20 are round holes so that the locking claws 14 of the two spacing rods 20 are in opposite directions. Insert into 22. As a result, the locking claws 14 of the two spacing bars 20 form a roughly helical locking claw, and the printed wiring board 10 is fixed by sandwiching the printed wiring board 10 with the appropriate locking claws 14 of the spacing bars 20. . At this time, the locking claw 14 having the best fixed spacing of the printed wiring board 10 is selected from the plurality of locking claws 14. At least two fixing pins 24 are inserted into the holes 16 of the distance bar 20 to fix the two distance bars 20. A cylindrical member 26 for preventing tip cracking is closely fixed to the outer peripheries of both ends of the two fixed spacing rods 20 to prevent expansion of the female thread portion of the spacing rod 20. The electronic component 12 is provided on the upper end of the spacing bar 20.
Etc. are directly fixed with screws 28, and the support member 3 is attached to the lower end thereof.
2 etc. are fixed directly with screws 28.

Further, when the thickness of the printed wiring board 10 is thicker than the initial setting, when the two spacing bars 20 are inserted into the round holes 22 of the printed wiring board 10, the two spacing bars 20 are inserted.
It is necessary to move one of them in the vertical direction slightly from the initially set position so as to be sandwiched by the locking claws 14.
At this time, since the holes 16 initially provided at equal intervals cannot be used, holes are provided at appropriate positions of the interval rod 20 by a drill or the like so that the fixing pins 24 are inserted.

The spacing bar 20 used in this embodiment can be manufactured in large quantities by plastic molding.

FIG. 2 shows another embodiment of the present invention, in which two printed wiring boards 34 and 36 and spacing bars 38 and 40 are fixed by screws 29. The spacing bar 38 is longer than the spacing bar 40,
Since the space rods 38 and 40 each form an integral rod with two rods and are flexible, the upper side printed wiring board 34, which is hierarchically mounted, should be attached to the printed wiring board 36 at an angle. become. The detailed shapes of the spacing bars 38 and 40 are the same as those in the embodiment shown in FIG. 1, and the description thereof will be omitted.

Effect of the Invention Since the spacing maintaining structure of the present invention is configured as described above in detail, the spacing between printed wiring boards and electronic components can be set freely, and when the printed wiring boards are hierarchically mounted, only parallel setting is required. Since the inclination can be set without using it, it is possible to widely meet the required mounting form. When the space bar is inserted and fixed to the printed wiring board, a special tool is not required, so that workability can be improved.

Furthermore, since the spacing bar, the fixing pin, the cylindrical member, and the screw can hold the fixed spacing of the printed wiring board and electronic parts,
There is an effect that it is not necessary to prepare a large number of types of spacing members, and inventory management becomes easy.

[Brief description of drawings]

 FIG. 1 is a diagram showing an embodiment of the gap maintaining structure according to the present invention, FIG. 2 is a diagram showing another embodiment of the gap maintaining structure according to the present invention, and FIG. 3 is a partially enlarged view of a gap rod according to the present invention. The figure shows a block diagram of a conventional spacing structure. 10, 34, 36 ... Printed wiring board, 12 ... Electronic component, 14 ... Locking claw, 16 ... Hole, 18 ... Tap groove, 20, 38, 40 ... Spacing bar, 22 ... Round hole , 24 ... fixing pin, 26 ... cylindrical member, 28, 29 ... screw, 32 ... support member, 42, 44, 46 ... spacing bolt, 48 ... female screw portion, 50 ... male screw portion.

Claims (1)

[Scope of utility model registration request] 1. A plurality of printed wiring boards (10), electronic components (12)
In the space holding structure that holds the fixed space when the layers are mounted in layers, the cross section has a semicircular shape and has a threaded locking claw (14) inclined in one direction on the outer periphery thereof. ) Has a hole (16) between
Further, the two spacing bars (20) having the tap grooves (18) on the inner circumference of the cross section are provided in the circular holes of the printed wiring board (10) so that the locking claws (14) are oriented in opposite directions. Insert it into (22) and use the locking claws (14) of the two spacing bars (20) to attach the printed wiring board (1
(0) is held from the front and back, the fixing pin (24) is inserted into the hole (16) of the spacing bar (20) to integrate the two spacing bars (20), and A space holding structure characterized in that a cylindrical member (26) is closely fixed to the outer circumferences of both ends.