JP4196549B2 - Printed board unit assembly structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printed board unit assembly structure in which a plurality of printed board units each having a printed board held by a metal frame are stacked.
In electronic devices and communication devices that are mounted on various mobile objects, sufficient protection measures are taken to withstand harsh vibrations, shocks, and thermal environments, but they are especially mounted on aerospace vehicles. Products are required to have high strength and high rigidity to withstand lighter and more severe vibration environments.
[0002]
For this reason, one printed circuit board, which is a printed circuit board, is configured as a printed circuit board unit that is mounted on a metal frame, and a plurality of printed circuit board units are stacked and a metal cover is mounted on the upper and lower surfaces. The assembly structure of a multilayer structure is adopted in which the whole is screwed to form an integral box-shaped housing.
[0003]
[Prior art]
14 is a front view of a conventional printed board unit assembly structure according to the present invention, and FIG. 15 is a plan view seen from the upper side of FIG. The schematic configuration of the printed board unit will be described. A plurality of second printed board units 2 are sequentially stacked on the first printed board unit 1 at the lowermost stage, in this case, five stages are stacked. The periphery of the cover 3 is attached to the frame body with screws 4 on the printed board unit 2, and as shown in the side cross-sectional view of the main part of FIG. It is a configuration that can be tightened.
[0004]
The inside of the second printed board unit 2 is shown in the plan view of FIG. The frame body 7 that accommodates and holds the printed board 6 has a rectangular frame shape, and the printed board 6 is attached to the bottom of the inner periphery with a plurality of screws 8. In addition, connectors 11 and 12 that are connected to the printed board 6 by circuits are attached before and after the frame body 7. Although the functional circuit configuration of the printed board 6 of each printed board unit 1 and 2 is different, the basic arrangement structure is the same.
[0005]
Through holes 13 are provided at the four corners of the frame body 7 of the second printed board unit 2, and screw holes 14 are formed at the four corners of the first printed board unit 1.
Around the lower portion of the first printed board unit 1, a flange-like frame 15 for installation is integrally extended from the frame body together with stays 16 for reinforcement at the four corners. 17 is provided.
[0006]
The frame body 7 and the cover 3 constituting the first printed board unit 1 and the second printed board unit 2 are all made by cutting an aluminum alloy for light weight so that high rigidity can be obtained. The mounting screws are made of, for example, stainless steel having high strength.
[0007]
[Problems to be solved by the invention]
According to the assembly structure of the conventional printed board unit described above, the long screw 5 penetrating the plurality of second printed board units 2 is screwed into the screw hole 14 of the first printed board unit 1 and fixedly coupled. Therefore, since the screw 5 has a screw shaft that is extremely long with respect to the screw diameter, it is difficult to obtain a fastening force that is expected with a specified fastening force. In other words, if the torsional force of the screw itself is generated by the tightening force and the residual torsion occurs in the shaft part, the residual torsion is released depending on the severe vibration environment and the tightening force is reduced, and there is a gap between the printed board units. May cause slipping.
[0008]
Since the length of the screw 5 is longer than the diameter, the resonance frequency is low, and the vibration test is accompanied by intense vibration noise of the printed board unit, which makes it impossible to identify and recognize vibration noise caused by other parts. It will also be a hindrance.
The material of the frame body 7 uses an aluminum alloy for weight reduction, and the long screw 5 uses a steel material to guarantee strength. By using such a combination, the fastening force may be reduced due to the difference in linear expansion coefficient due to a temperature test after assembly or a temperature change in a use environment, and on the contrary, an excessive stress may be generated.
[0009]
Furthermore, when the shape of the frame body 7 is axisymmetric, a human error such as reversing and assembling from a normal direction may occur.
In view of the above-mentioned conventional problems, the present invention is to be able to assemble with a standard length screw without using a long screw. In addition, by using the same type of material as the frame for the coupling member, the effect of temperature differences can be reduced. Furthermore, it is an object of the present invention to provide a configuration that can eliminate errors in the assembly direction.
[0010]
[Means for Solving the Problems]
The first means of the printed board unit assembly structure of the present invention for solving the above problems is a print in which a plurality of printed board units each having a printed board held by a metal frame are stacked. A printed board unit assembly having a board unit assembly structure, wherein both ends of a metal coupling bar inserted through a through-hole penetrating the frame are screwed from outside the printed board unit at both ends. Structure.
[0011]
According to this first means, the both ends of the plurality of frames constituting the individual printed board units and the standard length screws screwed into the coupling bar at both ends of the coupling bar penetrating through the frames. Because it is tightened from the outside of the frame that is the printed board unit of the part, it is sufficient to prepare a connecting bar with a length corresponding to the number of printed board units, and the cross-sectional area of the connecting bar is sufficient to twist There is no problem with.
[0012]
Since the plurality of frames and the connecting bar are the same metal material, there is no difference in linear expansion coefficient, so there is no problem due to mutual length fluctuations according to temperature changes in the usage environment. Is.
According to a second aspect of the present invention, the second means is a printed board unit assembly structure in which a plurality of printed board units each having a printed board held by a metal frame is stacked, and penetrates through the frame. Both ends of the metal coupling bar inserted through the hole are screwed from the outside of the printed board unit at both ends, and the through hole and the coupling bar form two sides parallel to each other in cross section In addition, the printed board unit assembly structure is configured such that two sides of the through hole and the coupling bar are engaged with each other.
[0013]
According to the second means, in addition to the same action as the first means, the counterbore hole and the through hole of the frame body and the coupling rod inserted through the through hole are parallel to each other in a sectional view. The sides are formed so that they do not rotate around the axis when combined. Therefore, the screw can be easily and reliably tightened.
According to a third aspect of the present invention, there is provided a printed board unit assembly structure in which a plurality of printed board units, each having a printed board held by a metal frame, are stacked, and penetrates through the frame. Both ends of the metal coupling bar inserted through the hole are screwed from the outside of the printed board unit at both ends, and the through hole and the coupling bar form two sides parallel to each other in cross section At least one of the through-holes and the connecting rods arranged so that the two sides of the through-holes and the connecting rods engaged with each other are aligned in a fixed direction at a plurality of positions. This is a printed board unit assembly structure in which the direction of one through hole and the connecting bar is different.
[0014]
According to the third means, in addition to the same action as the first means and the second means, in addition to the counterbore hole and the through hole of at least one frame body of the plurality of places, and the coupling rod Since the direction of the combination is different, an operation mistake such as erroneously assembling the direction of the printed board unit is prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the printed board unit assembly structure of the present invention will be described in detail with reference to the drawings with reference to the preferred embodiments based on the configuration summary. Throughout the drawings, the same portions are denoted by the same reference numerals for the sake of convenience in order to facilitate understanding.
[0016]
FIG. 1 is a front view of an embodiment of the printed board unit assembly structure of the present invention, and FIG. The schematic configuration will be described with reference to the drawings. A plurality of second printed board units 22 are sequentially stacked on the first printed board unit 21 at the lowermost stage, in this case, four stages are stacked, and the third printed board is placed at the uppermost part. The plate unit 23 is configured to be stacked. The upper surface of the third printed board unit 23 is covered with a cover 3 attached by screws 4.
[0017]
As well shown in FIG. 2, a connecting bar 24 penetrating each of the first printed board unit 21 and the third printed board unit 23 and passing through each of the second printed board units 22 is inserted. The coupling screws 25 and 26 inserted from the upper and lower sides of the first printed board unit 21 and the third printed board unit 23 are screwed into the screw holes 27 at both ends of the coupling bar 24 and tightened. It is fixed by coupling. Such a coupling structure is made at the four corners of the printed board unit.
[0018]
The internal structure of the first printed circuit board unit shown in the plan view of FIG. 3 is a rectangular frame around the frame body 28 that accommodates and holds the printed circuit board 6, and a plurality of printed circuit boards 6 are provided at the bottom of the inner periphery. The screw 8 is attached. Connectors 11 and 12 connected to the printed circuit board 6 are attached to the front and rear of the frame body 28. Although the functional circuits of the printed board units 21, 22, and 23 are different, the basic arrangement structure is substantially the same.
[0019]
Around the lower portion of the first printed board unit 21, a flange-like frame 15 for installation is integrally extended from the frame body together with stays 16 for reinforcement at the four corners. 17 is provided. The frame body 28 is made by cutting an aluminum alloy for weight reduction.
As shown in the front view of FIG. 4 (a) and the plan view of FIG. 4 (b), the connecting bar 24 is formed with cylindrical side surfaces on parallel plane portions 29. Specifically, as shown in FIG. 5, the flat portion 29 is formed on two parallel sides of the width L1 by making both sides of the diameter D1 have the width B1.
[0020]
The connecting bar 24 is processed by cutting and finishing an aluminum alloy for weight reduction, and a helical helisert (trade name) is screwed into the screw holes 27 at both ends to ensure strength. .
Attachment holes 31 are provided at the four corners of the frame body 28 of the first printed board unit 21. Referring to FIG. 6A, which is an enlarged plan view of the main portion of FIG. 6, and FIG. 7B, which is a cross-sectional view taken along the line AA of FIG. Is formed with an oval counterbored portion 32 and a screw insertion hole 33 penetrating downward in the center thereof, and a counterbored portion 34 for screw head insertion is formed on the bottom surface side.
[0021]
As shown in FIG. 7, the oval counterbore part 32 moves the center position of the end mill L2 linearly in the length direction by milling machining with an end mill having a diameter D2, so that the length L2 is L2 on both sides and the length is L2. Two parallel sides are formed.
5 and 7 are compared, the width D2 of the oval countersink 32 is equal to the width B1 of the coupling bar 24, and the side length L2 of the oval countersink 32 is for coupling. It is set to be equal to the side length L1 of the bar 24. Therefore, although the coupling bar 24 can be fitted to the oval counterbore 32, naturally a dimensional difference within an allowable range is given.
[0022]
As shown in FIG. 3, there are four oval countersink portions 32, but three of the oval countersink portions 32-1, −2, −3 are in the same fixed direction. The remaining one 32-4 direction is formed so as to be different by 90 °.
The third printed board unit 23 is formed symmetrically with the same shape as the first printed board unit 21, and 35 corresponding to the oval counterbore 32 is formed on the bottom side. 36 corresponding to the screw insertion hole 33 is formed through the upper surface side. Further, as is clear from each drawing, a portion corresponding to the countersunk portion 34 for screw head insertion is not formed.
[0023]
Accordingly, for the oval counterbore 35, 35-1, -2, and -3 are arranged in an aligned state in the same and same direction as the first printed board unit 21, and the remaining one place. 35-4 are formed in different directions.
FIG. 8 shows the internal structure of the second printed board unit 22 that is interposed between the first printed board unit 21 and the third printed board unit 23 and accommodates and holds the printed board 6. The periphery of the frame body 41 is a rectangular frame shape, and the printed board 6 is attached to the bottom of the inner periphery with a plurality of screws 8. Before and after the frame body 41, connectors 11 and 12 connected to the printed board 6 are attached.
[0024]
Attachment holes 42 are provided at the four corners of the frame 41 of the second printed board unit 23, respectively. The mounting hole 42 has an oval shape, and as shown in FIG. 7, the center position of the end mill having the diameter D2 is linearly moved by L2 in the length direction. An edge is formed.
As shown in FIG. 8, there are four oval mounting holes 42, and three of the mounting holes 42-1, -2, and -3 are aligned in a certain same direction. It is arranged as a state, and the direction of the remaining 42-4 is formed 90 degrees different. The direction of such an oval coincides with the direction of the oval countersink portion 32 of the attachment hole 31 of the first printed board unit 21 described in FIG.
[0025]
The assembly procedure of the printed board unit of the present invention having the above configuration will be described below. First, referring to the plan view of the first printed board unit 21 in FIG. 9 and the sectional side view of the main part in FIG. Insert a coupling bar 24 into each of the oval countersink portions 32 of the mounting holes 31 at the four corners of the body 28, and insert a washer and a coupling screw 26 from a countersink portion 34 for screw head insertion on the bottom side. Then, the screw is screwed into the screw hole 27 of the connecting rod 24 and tightened loosely.
[0026]
As shown in the enlarged view of the main part of FIG. 11, the coupling bar 24 is fitted so that the plane portion 29 extends along the length direction of the oval countersink portion 32, and each direction is determined. It is done. That is, as shown in FIG. 9, the oval countersink portions 32-1, -2, and -3 are aligned in the same direction, and the direction of 90 ° is different from that of 32-4. Set to
[0027]
Next, four second printed board units 22 are sequentially stacked from the top of the first printed board unit 21, and mounting holes 42 at the four corners are inserted in accordance with the respective connecting bars 24. However, this state is shown in the enlarged view of the main part of FIG.
This can also be inserted by aligning the direction of the mounting hole 42 with respect to the connecting rod 24, but it cannot be inserted in the reverse or upside down orientation. It is certainly prevented from occurring.
[0028]
Finally, as shown in FIG. 10, the oval countersunk portion 35 of the third printed board unit 23 is fitted to the tip of the coupling bar 24 and coupled to the screw insertion hole 36 from above with a washer. The screw 25 for insertion is inserted and screwed into the screw hole 27 at the tip of the connecting bar 24 and tightened. At the same time, the coupling screw 26 on the lower surface side of the first printed board unit 21 is also tightened to complete the assembly.
[0029]
This state is shown in FIG. 2, and the appearance is shown in FIG. As shown in FIG. 2, a slight gap is appropriately provided between the upper end portion of the coupling bar 24 and the bottom surface on the upper side of the oval countersink portion 35 of the third printed board unit 23. Is set. This is to secure the contact and fixing between the printed board units 21, 22 and 23 by fastening the coupling screw 25.
[0030]
As described above, the oval counterbore portions 32 and 35 and the similar oval mounting hole 42 and the flat portions 29 on both sides of the coupling rod 24 are formed and fitted to each other. Since the connecting rod 24 does not rotate when the screws 25 and 26 are tightened, the connecting screws 25 and 26 can be securely tightened.
As shown in FIG. 10, a protruding step surface 43 is provided on the bottom surface side of the frame body 41 of the second printed board unit 22 and the third printed board unit 23. The step surface 43 has a shape that can be fitted around the inside of the frame body 28 of the first printed board unit 21 and the frame body 41 of the second printed board unit 22, and the upper and lower frames can be fitted together. Since the position between the bodies is set so that the positioning is performed without moving, there is no need for positioning because mutual positional deviation does not occur.
[0031]
As shown in FIG. 13, on the surface of the flat portion 29 of the connecting bar 24, the number of ruled lines 45 is sequentially increased from the bottom to the top, while the surface of each printed board unit is formed. By providing the ruled lines 46 so as to correspond to each other, the second printed board unit 22 in the lowermost stage is stacked on the first printed board unit 21 as shown by the two-dot chain line, thereby being coupled. The number of ruled lines 45 attached to the flat portion 29 of the bar 24 and the ruled lines 46 attached to the side surface of the frame of the second printed board unit 22 are the same, and thus the number of ruled lines is the same. By confirming that it is confirmed that the stacking order of the printed board units is not wrong. Such a thing is possible not only with ruled lines but also with numbers and other marks.
[0032]
(Supplementary Note 1) A printed board unit assembly structure in which a plurality of printed board units each having a printed board held by a metal frame are stacked,
A printed board unit assembly structure, wherein both ends of a metal coupling bar inserted through a through-hole penetrating the frame are screwed from the outside of the printed board unit at both ends.
[0033]
(Additional remark 2) It is a printed board unit assembly structure which laminates | stacks two or more printed board units by which a printed board is hold | maintained at the metal frame body,
Both ends of the metal coupling bar inserted through the through hole penetrating the frame body are screwed from the outside of the printed board unit at both ends, and the through hole and the coupling bar are A printed board unit assembly structure characterized in that two sides parallel to each other in cross section are formed and two sides of the through hole and the connecting bar are engaged with each other.
[0034]
(Additional remark 3) It is a printed board unit assembly structure which laminates | stacks two or more printed board units by which a printed board is hold | maintained at the metal frame body,
Both ends of the metal coupling bar inserted through the through hole penetrating the frame body are screwed from the outside of the printed board unit at both ends, and the through hole and the coupling bar are A plurality of locations in which the through-holes and the connecting rods, which are configured so that the two sides of the through-holes formed with two sides parallel to each other in cross-section and the connecting rods are engaged, are aligned in a certain direction. A printed board unit assembly structure characterized in that at least one of the through-holes and the connecting bar are arranged in different directions.
[0035]
(Appendix 4) In the printed board unit assembly structure according to any one of appendices 1 to 3,
Corresponding unique marks are respectively provided on the side surface of the coupling bar attached to the lower printed board unit and the frame of the printed board unit laminated on the lower printed board unit. Printed board unit assembly structure characterized by
[0036]
(Supplementary Note 5) In the printed board unit assembly structure according to any one of Supplementary notes 1 to 4,
The printed board unit assembly structure, wherein the metal frame and the connecting bar are made of the same metal material.
[0037]
【The invention's effect】
As described above in detail, according to the printed board unit assembly structure of the present invention, a plurality of frames constituting each printed board unit, and both ends of the connecting bar penetrating these frames, The coupling screw to be screwed into the coupling bar via the printed board unit is a standard length screw, and it is tightened from the outside of the frame of the printed board unit at both ends, so it is firmly coupled with sufficient tightening force Can be fixed.
[0038]
The connecting bar may be prepared with a length corresponding to the number of printed board units to be laminated, and the cross-sectional area is sufficient, so that there is no problem with twisting as in the prior art.
Since the linear expansion coefficient is the same by using the same metal material for the plurality of frames and the connecting bar, the mutual lengths follow and change according to the temperature change in the usage environment, which is convenient. .
[0039]
By forming and combining the counterbore hole of the frame body and the through-hole and the coupling rod inserted through the through-hole into two sides parallel to the cross-sectional view, the coupling rod does not rotate around the axis, Therefore, the coupling screw can be easily and reliably tightened.
By making the direction of the combination of the frame of at least one of the plurality of places, the countersink hole, the through hole, and the connecting bar different from each other, an operation error such as erroneous assembly of the printed board unit is prevented. .
[0040]
A unique visible indicia corresponding to the side surface of the coupling bar attached to the lower printed board unit and the frame of the printed board unit laminated on the lower printed board unit. By providing, the assembling work can be performed while confirming the assembling order to be laminated. The practical effects are extremely remarkable.
[0041]
The number of connecting rods is not limited to that of the embodiment, and can be an arbitrary number depending on the size and weight of the printed board unit, and the combination of the alignment directions is also symmetrical. If it cannot be assembled in the reverse direction, this can also be set arbitrarily.
[Brief description of the drawings]
FIG. 1 is a front view of an embodiment of a printed board unit assembly structure of the present invention.
2 is a cross-sectional side view of a main part of FIG. 1;
FIG. 3 is a plan view of a first printed board unit.
FIG. 4 is an external view of a connecting bar.
FIG. 5 is a method for manufacturing a connecting bar.
6 is an enlarged view of a main part of FIG. 3. FIG.
FIG. 7 is a manufacturing method of an oval countersink and an attachment hole.
FIG. 8 is a plan view of a second printed board unit.
FIG. 9 is an explanatory diagram (part 1) of the printed board unit assembly procedure;
FIG. 10 is an explanatory diagram (part 2) of the procedure for assembling the printed board unit.
11 is a view taken along arrow BB in FIG.
12 is a view taken in the direction of arrows CC in FIG.
FIG. 13 is an explanatory diagram (part 3) of the printed board unit assembly procedure;
FIG. 14 is a front view of a conventional printed board unit assembly structure.
15 is a plan view of FIG. 14. FIG.
FIG. 16 is a plan view of a second printed board unit.
17 is a sectional side view of the main part of FIG. 14;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st printed board unit 2 2nd printed board unit 3 Cover 4 Screw 5 Long screw 6 Printed board 7 Frame body 8 Screw 11, 12 Connector 13 Through hole 14 Screw hole 15 Frame 16 Stay 17 Mounting hole 21 1st Printed board unit 22 Second printed board unit 23 Third printed board unit 24 Connecting rod 25, 26 Connecting screw 27 Screw hole 28 Frame portion 29 Plane 31 Mounting hole 32 Oval countersink 33 Screw insertion hole 34 Countersink part 35 for screw head insertion Oval countersink part 36 Screw insertion hole 41 Frame body 42 Mounting hole 43 Step surface 45, 46 Ruled line

Claims (3)

A printed board unit assembly structure in which a plurality of printed board units each having a printed board held by a metal frame is laminated,
A printed board unit assembly structure characterized in that both ends of a metal coupling rod inserted through a through-hole penetrating the frame are screwed from the outside of the printed board unit at both ends. A printed board unit assembly structure in which a plurality of printed board units each having a printed board held by a metal frame is laminated,
Both ends of the metal coupling bar inserted through the through hole penetrating the frame body are screwed from the outside of the printed board unit at both ends, and the through hole and the coupling bar are A printed board unit assembly structure, wherein two sides parallel to each other in cross-section are formed, and two sides of the through hole and the coupling bar are engaged with each other. A printed board unit assembly structure in which a plurality of printed board units each having a printed board held by a metal frame is laminated,
Both ends of the metal coupling bar inserted through the through hole penetrating the frame body are screwed from the outside of the printed board unit at both ends, and the through hole and the coupling bar are A plurality of locations in which the through-holes and the connecting rods, which are formed so that the two sides of the through-holes and the connecting rods formed with two sides parallel to each other in cross-section are engaged, are aligned in a certain direction. The printed board unit assembly structure is characterized in that at least one of the through-holes and the connecting bar are arranged in different directions.

Images